1 Version 1.62.1 (2022-07-19)
2 ==========================
4 Rust 1.62.1 addresses a few recent regressions in the compiler and standard
5 library, and also mitigates a CPU vulnerability on Intel SGX.
7 * [The compiler fixed unsound function coercions involving `impl Trait` return types.][98608]
8 * [The compiler fixed an incremental compilation bug with `async fn` lifetimes.][98890]
9 * [Windows added a fallback for overlapped I/O in synchronous reads and writes.][98950]
10 * [The `x86_64-fortanix-unknown-sgx` target added a mitigation for the
11 MMIO stale data vulnerability][98126], advisory [INTEL-SA-00615].
13 [98608]: https://github.com/rust-lang/rust/issues/98608
14 [98890]: https://github.com/rust-lang/rust/issues/98890
15 [98950]: https://github.com/rust-lang/rust/pull/98950
16 [98126]: https://github.com/rust-lang/rust/pull/98126
17 [INTEL-SA-00615]: https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00615.html
19 Version 1.62.0 (2022-06-30)
20 ==========================
25 - [Stabilize `#[derive(Default)]` on enums with a `#[default]` variant][94457]
26 - [Stop validating some checks in dead code after functions with uninhabited return types][93313]
27 - [Fix constants not getting dropped if part of a diverging expression][94775]
28 - [Support unit struct/enum variant in destructuring assignment][95380]
29 - [Remove mutable_borrow_reservation_conflict lint and allow the code pattern][96268]
34 - [linker: Stop using whole-archive on dependencies of dylibs][96436]
35 - [Make `unaligned_references` lint deny-by-default][95372]
36 This lint is also a future compatibility lint, and is expected to eventually
38 - [Only add codegen backend to dep info if -Zbinary-dep-depinfo is used][93969]
39 - [Reject `#[thread_local]` attribute on non-static items][95006]
40 - [Add tier 3 `aarch64-pc-windows-gnullvm` and `x86_64-pc-windows-gnullvm` targets\*][94872]
41 - [Implement a lint to warn about unused macro rules][96150]
42 - [Promote `x86_64-unknown-none` target to Tier 2\*][95705]
44 \* Refer to Rust's [platform support page][platform-support-doc] for more
45 information on Rust's tiered platform support.
50 - [Move `CStr` to libcore, and `CString` to liballoc][94079]
51 - [Windows: Use a pipe relay for chaining pipes][95841]
52 - [Replace Linux Mutex and Condvar with futex based ones.][95035]
53 - [Replace RwLock by a futex based one on Linux][95801]
54 - [std: directly use pthread in UNIX parker implementation][96393]
63 - [`windows::CommandExt::raw_arg`]
64 - [`impl<T: Default> Default for AssertUnwindSafe<T>`]
65 - [`From<Rc<str>> for Rc<[u8]>`][rc-u8-from-str]
66 - [`From<Arc<str>> for Arc<[u8]>`][arc-u8-from-str]
67 - [`FusedIterator for EncodeWide`]
68 - [RDM intrinsics on aarch64][stdarch/1285]
73 - [Create clippy lint against unexpectedly late drop for temporaries in match scrutinee expressions][94206]
78 - Added the `cargo add` command for adding dependencies to `Cargo.toml` from
80 [docs](https://doc.rust-lang.org/nightly/cargo/commands/cargo-add.html)
81 - Package ID specs now support `name@version` syntax in addition to the
82 previous `name:version` to align with the behavior in `cargo add` and other
83 tools. `cargo install` and `cargo yank` also now support this syntax so the
84 version does not need to passed as a separate flag.
85 - The `git` and `registry` directories in Cargo's home directory (usually
86 `~/.cargo`) are now marked as cache directories so that they are not
87 included in backups or content indexing (on Windows).
88 - Added automatic `@` argfile support, which will use "response files" if the
89 command-line to `rustc` exceeds the operating system's limit.
94 - `cargo test` now passes `--target` to `rustdoc` if the specified target is
95 the same as the host target.
96 [#10594](https://github.com/rust-lang/cargo/pull/10594)
97 - [rustdoc: Remove .woff font files][96279]
98 - [Enforce Copy bounds for repeat elements while considering lifetimes][95819]
103 - [Unify ReentrantMutex implementations across all platforms][96042]
105 These changes provide no direct user facing benefits, but represent significant
106 improvements to the internals and overall performance of rustc
109 [93313]: https://github.com/rust-lang/rust/pull/93313/
110 [93969]: https://github.com/rust-lang/rust/pull/93969/
111 [94079]: https://github.com/rust-lang/rust/pull/94079/
112 [94206]: https://github.com/rust-lang/rust/pull/94206/
113 [94457]: https://github.com/rust-lang/rust/pull/94457/
114 [94775]: https://github.com/rust-lang/rust/pull/94775/
115 [94872]: https://github.com/rust-lang/rust/pull/94872/
116 [95006]: https://github.com/rust-lang/rust/pull/95006/
117 [95035]: https://github.com/rust-lang/rust/pull/95035/
118 [95372]: https://github.com/rust-lang/rust/pull/95372/
119 [95380]: https://github.com/rust-lang/rust/pull/95380/
120 [95431]: https://github.com/rust-lang/rust/pull/95431/
121 [95705]: https://github.com/rust-lang/rust/pull/95705/
122 [95801]: https://github.com/rust-lang/rust/pull/95801/
123 [95819]: https://github.com/rust-lang/rust/pull/95819/
124 [95841]: https://github.com/rust-lang/rust/pull/95841/
125 [96042]: https://github.com/rust-lang/rust/pull/96042/
126 [96150]: https://github.com/rust-lang/rust/pull/96150/
127 [96268]: https://github.com/rust-lang/rust/pull/96268/
128 [96279]: https://github.com/rust-lang/rust/pull/96279/
129 [96393]: https://github.com/rust-lang/rust/pull/96393/
130 [96436]: https://github.com/rust-lang/rust/pull/96436/
131 [96557]: https://github.com/rust-lang/rust/pull/96557/
133 [`bool::then_some`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then_some
134 [`f32::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.total_cmp
135 [`f64::total_cmp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.total_cmp
136 [`Stdin::lines`]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lines
137 [`impl<T: Default> Default for AssertUnwindSafe<T>`]: https://doc.rust-lang.org/stable/std/panic/struct.AssertUnwindSafe.html#impl-Default
138 [rc-u8-from-str]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#impl-From%3CRc%3Cstr%3E%3E
139 [arc-u8-from-str]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#impl-From%3CArc%3Cstr%3E%3E
140 [stdarch/1285]: https://github.com/rust-lang/stdarch/pull/1285
141 [`windows::CommandExt::raw_arg`]: https://doc.rust-lang.org/stable/std/os/windows/process/trait.CommandExt.html#tymethod.raw_arg
142 [`FusedIterator for EncodeWide`]: https://doc.rust-lang.org/stable/std/os/windows/ffi/struct.EncodeWide.html#impl-FusedIterator
144 Version 1.61.0 (2022-05-19)
145 ==========================
150 - [`const fn` signatures can now include generic trait bounds][93827]
151 - [`const fn` signatures can now use `impl Trait` in argument and return position][93827]
152 - [Function pointers can now be created, cast, and passed around in a `const fn`][93827]
153 - [Recursive calls can now set the value of a function's opaque `impl Trait` return type][94081]
158 - [Linking modifier syntax in `#[link]` attributes and on the command line, as well as the `whole-archive` modifier specifically, are now supported][93901]
159 - [The `char` type is now described as UTF-32 in debuginfo][89887]
160 - The [`#[target_feature]`][target_feature] attribute [can now be used with aarch64 features][90621]
161 - X86 [`#[target_feature = "adx"]` is now stable][93745]
166 - [`ManuallyDrop<T>` is now documented to have the same layout as `T`][88375]
167 - [`#[ignore = "…"]` messages are printed when running tests][92714]
168 - [Consistently show absent stdio handles on Windows as NULL handles][93263]
169 - [Make `std::io::stdio::lock()` return `'static` handles.][93965] Previously, the creation of locked handles to stdin/stdout/stderr would borrow the handles being locked, which prevented writing `let out = std::io::stdout().lock();` because `out` would outlive the return value of `stdout()`. Such code now works, eliminating a common pitfall that affected many Rust users.
170 - [`Vec::from_raw_parts` is now less restrictive about its inputs][95016]
171 - [`std::thread::available_parallelism` now takes cgroup quotas into account.][92697] Since `available_parallelism` is often used to create a thread pool for parallel computation, which may be CPU-bound for performance, `available_parallelism` will return a value consistent with the ability to use that many threads continuously, if possible. For instance, in a container with 8 virtual CPUs but quotas only allowing for 50% usage, `available_parallelism` will return 4.
176 - [`Pin::static_mut`]
177 - [`Pin::static_ref`]
178 - [`Vec::retain_mut`]
179 - [`VecDeque::retain_mut`]
180 - [`Write` for `Cursor<[u8; N]>`][cursor-write-array]
181 - [`std::os::unix::net::SocketAddr::from_pathname`]
182 - [`std::process::ExitCode`] and [`std::process::Termination`]. The stabilization of these two APIs now makes it possible for programs to return errors from `main` with custom exit codes.
183 - [`std::thread::JoinHandle::is_finished`]
185 These APIs are now usable in const contexts:
187 - [`<*const T>::offset` and `<*mut T>::offset`][ptr-offset]
188 - [`<*const T>::wrapping_offset` and `<*mut T>::wrapping_offset`][ptr-wrapping_offset]
189 - [`<*const T>::add` and `<*mut T>::add`][ptr-add]
190 - [`<*const T>::sub` and `<*mut T>::sub`][ptr-sub]
191 - [`<*const T>::wrapping_add` and `<*mut T>::wrapping_add`][ptr-wrapping_add]
192 - [`<*const T>::wrapping_sub` and `<*mut T>::wrapping_sub`][ptr-wrapping_sub]
193 - [`<[T]>::as_mut_ptr`][slice-as_mut_ptr]
194 - [`<[T]>::as_ptr_range`][slice-as_ptr_range]
195 - [`<[T]>::as_mut_ptr_range`][slice-as_mut_ptr_range]
200 No feature changes, but see compatibility notes.
205 - Previously native static libraries were linked as `whole-archive` in some cases, but now rustc tries not to use `whole-archive` unless explicitly requested. This [change][93901] may result in linking errors in some cases. To fix such errors, native libraries linked from the command line, build scripts, or [`#[link]` attributes][link-attr] need to
206 - (more common) either be reordered to respect dependencies between them (if `a` depends on `b` then `a` should go first and `b` second)
207 - (less common) or be updated to use the [`+whole-archive`] modifier.
208 - [Catching a second unwind from FFI code while cleaning up from a Rust panic now causes the process to abort][92911]
209 - [Proc macros no longer see `ident` matchers wrapped in groups][92472]
210 - [The number of `#` in `r#` raw string literals is now required to be less than 256][95251]
211 - [When checking that a dyn type satisfies a trait bound, supertrait bounds are now enforced][92285]
212 - [`cargo vendor` now only accepts one value for each `--sync` flag][cargo/10448]
213 - [`cfg` predicates in `all()` and `any()` are always evaluated to detect errors, instead of short-circuiting.][94295] The compatibility considerations here arise in nightly-only code that used the short-circuiting behavior of `all` to write something like `cfg(all(feature = "nightly", syntax-requiring-nightly))`, which will now fail to compile. Instead, use either `cfg_attr(feature = "nightly", ...)` or nested uses of `cfg`.
214 - [bootstrap: static-libstdcpp is now enabled by default, and can now be disabled when llvm-tools is enabled][94832]
219 These changes provide no direct user facing benefits, but represent significant
220 improvements to the internals and overall performance of rustc
223 - [debuginfo: Refactor debuginfo generation for types][94261]
224 - [Remove the everybody loops pass][93913]
226 [88375]: https://github.com/rust-lang/rust/pull/88375/
227 [89887]: https://github.com/rust-lang/rust/pull/89887/
228 [90621]: https://github.com/rust-lang/rust/pull/90621/
229 [92285]: https://github.com/rust-lang/rust/pull/92285/
230 [92472]: https://github.com/rust-lang/rust/pull/92472/
231 [92697]: https://github.com/rust-lang/rust/pull/92697/
232 [92714]: https://github.com/rust-lang/rust/pull/92714/
233 [92911]: https://github.com/rust-lang/rust/pull/92911/
234 [93263]: https://github.com/rust-lang/rust/pull/93263/
235 [93745]: https://github.com/rust-lang/rust/pull/93745/
236 [93827]: https://github.com/rust-lang/rust/pull/93827/
237 [93901]: https://github.com/rust-lang/rust/pull/93901/
238 [93913]: https://github.com/rust-lang/rust/pull/93913/
239 [93965]: https://github.com/rust-lang/rust/pull/93965/
240 [94081]: https://github.com/rust-lang/rust/pull/94081/
241 [94261]: https://github.com/rust-lang/rust/pull/94261/
242 [94295]: https://github.com/rust-lang/rust/pull/94295/
243 [94832]: https://github.com/rust-lang/rust/pull/94832/
244 [95016]: https://github.com/rust-lang/rust/pull/95016/
245 [95251]: https://github.com/rust-lang/rust/pull/95251/
246 [`+whole-archive`]: https://doc.rust-lang.org/stable/rustc/command-line-arguments.html#linking-modifiers-whole-archive
247 [`Pin::static_mut`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_mut
248 [`Pin::static_ref`]: https://doc.rust-lang.org/stable/std/pin/struct.Pin.html#method.static_ref
249 [`Vec::retain_mut`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.retain_mut
250 [`VecDeque::retain_mut`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.retain_mut
251 [`std::os::unix::net::SocketAddr::from_pathname`]: https://doc.rust-lang.org/stable/std/os/unix/net/struct.SocketAddr.html#method.from_pathname
252 [`std::process::ExitCode`]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html
253 [`std::process::Termination`]: https://doc.rust-lang.org/stable/std/process/trait.Termination.html
254 [`std::thread::JoinHandle::is_finished`]: https://doc.rust-lang.org/stable/std/thread/struct.JoinHandle.html#method.is_finished
255 [cargo/10448]: https://github.com/rust-lang/cargo/pull/10448/
256 [cursor-write-array]: https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#impl-Write-4
257 [link-attr]: https://doc.rust-lang.org/stable/reference/items/external-blocks.html#the-link-attribute
258 [ptr-add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.add
259 [ptr-offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset
260 [ptr-sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.sub
261 [ptr-wrapping_add]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_add
262 [ptr-wrapping_offset]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_offset
263 [ptr-wrapping_sub]: https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.wrapping_sub
264 [slice-as_mut_ptr]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr
265 [slice-as_mut_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_mut_ptr_range
266 [slice-as_ptr_range]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_ptr_range
267 [target_feature]: https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute
270 Version 1.60.0 (2022-04-07)
271 ==========================
275 - [Stabilize `#[cfg(panic = "...")]` for either `"unwind"` or `"abort"`.][93658]
276 - [Stabilize `#[cfg(target_has_atomic = "...")]` for each integer size and `"ptr"`.][93824]
280 - [Enable combining `+crt-static` and `relocation-model=pic` on `x86_64-unknown-linux-gnu`][86374]
281 - [Fixes wrong `unreachable_pub` lints on nested and glob public reexport][87487]
282 - [Stabilize `-Z instrument-coverage` as `-C instrument-coverage`][90132]
283 - [Stabilize `-Z print-link-args` as `--print link-args`][91606]
284 - [Add new Tier 3 target `mips64-openwrt-linux-musl`\*][92300]
285 - [Add new Tier 3 target `armv7-unknown-linux-uclibceabi` (softfloat)\*][92383]
286 - [Fix invalid removal of newlines from doc comments][92357]
287 - [Add kernel target for RustyHermit][92670]
288 - [Deny mixing bin crate type with lib crate types][92933]
289 - [Make rustc use `RUST_BACKTRACE=full` by default][93566]
290 - [Upgrade to LLVM 14][93577]
292 \* Refer to Rust's [platform support page][platform-support-doc] for more
293 information on Rust's tiered platform support.
297 - [Guarantee call order for `sort_by_cached_key`][89621]
298 - [Improve `Duration::try_from_secs_f32`/`f64` accuracy by directly processing exponent and mantissa][90247]
299 - [Make `Instant::{duration_since, elapsed, sub}` saturating][89926]
300 - [Remove non-monotonic clocks workarounds in `Instant::now`][89926]
301 - [Make `BuildHasherDefault`, `iter::Empty` and `future::Pending` covariant][92630]
305 - [`Arc::new_cyclic`][arc_new_cyclic]
306 - [`Rc::new_cyclic`][rc_new_cyclic]
307 - [`slice::EscapeAscii`][slice_escape_ascii]
308 - [`<[u8]>::escape_ascii`][slice_u8_escape_ascii]
309 - [`u8::escape_ascii`][u8_escape_ascii]
310 - [`Vec::spare_capacity_mut`][vec_spare_capacity_mut]
311 - [`MaybeUninit::assume_init_drop`][assume_init_drop]
312 - [`MaybeUninit::assume_init_read`][assume_init_read]
313 - [`i8::abs_diff`][i8_abs_diff]
314 - [`i16::abs_diff`][i16_abs_diff]
315 - [`i32::abs_diff`][i32_abs_diff]
316 - [`i64::abs_diff`][i64_abs_diff]
317 - [`i128::abs_diff`][i128_abs_diff]
318 - [`isize::abs_diff`][isize_abs_diff]
319 - [`u8::abs_diff`][u8_abs_diff]
320 - [`u16::abs_diff`][u16_abs_diff]
321 - [`u32::abs_diff`][u32_abs_diff]
322 - [`u64::abs_diff`][u64_abs_diff]
323 - [`u128::abs_diff`][u128_abs_diff]
324 - [`usize::abs_diff`][usize_abs_diff]
325 - [`Display for io::ErrorKind`][display_error_kind]
326 - [`From<u8> for ExitCode`][from_u8_exit_code]
327 - [`Not for !` (the "never" type)][not_never]
328 - [_Op_`Assign<$t> for Wrapping<$t>`][wrapping_assign_ops]
329 - [`arch::is_aarch64_feature_detected!`][is_aarch64_feature_detected]
333 - [Port cargo from `toml-rs` to `toml_edit`][cargo/10086]
334 - [Stabilize `-Ztimings` as `--timings`][cargo/10245]
335 - [Stabilize namespaced and weak dependency features.][cargo/10269]
336 - [Accept more `cargo:rustc-link-arg-*` types from build script output.][cargo/10274]
337 - [cargo-new should not add ignore rule on Cargo.lock inside subdirs][cargo/10379]
341 - [Ship docs on Tier 2 platforms by reusing the closest Tier 1 platform docs][92800]
342 - [Drop rustc-docs from complete profile][93742]
343 - [bootstrap: tidy up flag handling for llvm build][93918]
347 - [Remove compiler-rt linking hack on Android][83822]
348 - [Mitigations for platforms with non-monotonic clocks have been removed from
349 `Instant::now`][89926]. On platforms that don't provide monotonic clocks, an
350 instant is not guaranteed to be greater than an earlier instant anymore.
351 - [`Instant::{duration_since, elapsed, sub}` do not panic anymore on underflow,
352 saturating to `0` instead][89926]. In the real world the panic happened mostly
353 on platforms with buggy monotonic clock implementations rather than catching
354 programming errors like reversing the start and end times. Such programming
355 errors will now results in `0` rather than a panic.
356 - In a future release we're planning to increase the baseline requirements for
357 the Linux kernel to version 3.2, and for glibc to version 2.17. We'd love
358 your feedback in [PR #95026][95026].
363 These changes provide no direct user facing benefits, but represent significant
364 improvements to the internals and overall performance of rustc
367 - [Switch all libraries to the 2021 edition][92068]
369 [83822]: https://github.com/rust-lang/rust/pull/83822
370 [86374]: https://github.com/rust-lang/rust/pull/86374
371 [87487]: https://github.com/rust-lang/rust/pull/87487
372 [89621]: https://github.com/rust-lang/rust/pull/89621
373 [89926]: https://github.com/rust-lang/rust/pull/89926
374 [90132]: https://github.com/rust-lang/rust/pull/90132
375 [90247]: https://github.com/rust-lang/rust/pull/90247
376 [91606]: https://github.com/rust-lang/rust/pull/91606
377 [92068]: https://github.com/rust-lang/rust/pull/92068
378 [92300]: https://github.com/rust-lang/rust/pull/92300
379 [92357]: https://github.com/rust-lang/rust/pull/92357
380 [92383]: https://github.com/rust-lang/rust/pull/92383
381 [92630]: https://github.com/rust-lang/rust/pull/92630
382 [92670]: https://github.com/rust-lang/rust/pull/92670
383 [92800]: https://github.com/rust-lang/rust/pull/92800
384 [92933]: https://github.com/rust-lang/rust/pull/92933
385 [93566]: https://github.com/rust-lang/rust/pull/93566
386 [93577]: https://github.com/rust-lang/rust/pull/93577
387 [93658]: https://github.com/rust-lang/rust/pull/93658
388 [93742]: https://github.com/rust-lang/rust/pull/93742
389 [93824]: https://github.com/rust-lang/rust/pull/93824
390 [93918]: https://github.com/rust-lang/rust/pull/93918
391 [95026]: https://github.com/rust-lang/rust/pull/95026
393 [cargo/10086]: https://github.com/rust-lang/cargo/pull/10086
394 [cargo/10245]: https://github.com/rust-lang/cargo/pull/10245
395 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269
396 [cargo/10274]: https://github.com/rust-lang/cargo/pull/10274
397 [cargo/10379]: https://github.com/rust-lang/cargo/pull/10379
399 [arc_new_cyclic]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.new_cyclic
400 [rc_new_cyclic]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.new_cyclic
401 [slice_escape_ascii]: https://doc.rust-lang.org/stable/std/slice/struct.EscapeAscii.html
402 [slice_u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.escape_ascii
403 [u8_escape_ascii]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.escape_ascii
404 [vec_spare_capacity_mut]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.spare_capacity_mut
405 [assume_init_drop]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_drop
406 [assume_init_read]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_read
407 [i8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.abs_diff
408 [i16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.abs_diff
409 [i32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.abs_diff
410 [i64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.abs_diff
411 [i128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.abs_diff
412 [isize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.abs_diff
413 [u8_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.abs_diff
414 [u16_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.abs_diff
415 [u32_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.abs_diff
416 [u64_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.abs_diff
417 [u128_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.abs_diff
418 [usize_abs_diff]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.abs_diff
419 [display_error_kind]: https://doc.rust-lang.org/stable/std/io/enum.ErrorKind.html#impl-Display
420 [from_u8_exit_code]: https://doc.rust-lang.org/stable/std/process/struct.ExitCode.html#impl-From%3Cu8%3E
421 [not_never]: https://doc.rust-lang.org/stable/std/primitive.never.html#impl-Not
422 [wrapping_assign_ops]: https://doc.rust-lang.org/stable/std/num/struct.Wrapping.html#trait-implementations
423 [is_aarch64_feature_detected]: https://doc.rust-lang.org/stable/std/arch/macro.is_aarch64_feature_detected.html
425 Version 1.59.0 (2022-02-24)
426 ==========================
431 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
432 - [Stabilize destructuring assignment][90521]
433 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
434 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
439 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
440 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
441 - [Fix sparc64 ABI for aggregates with floating point members][91003]
442 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
443 - [Add support for riscv64gc-unknown-freebsd][91284]
444 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
445 - [Soft disable incremental compilation][94124]
447 This release disables incremental compilation, unless the user has explicitly
448 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
449 This is due to a known and relatively frequently occurring bug in incremental
450 compilation, which causes builds to issue internal compiler errors. This
451 particular bug is already fixed on nightly, but that fix has not yet rolled out
452 to stable and is deemed too risky for a direct stable backport.
454 As always, we encourage users to test with nightly and report bugs so that we
455 can track failures and fix issues earlier.
457 See [94124] for more details.
459 [94124]: https://github.com/rust-lang/rust/issues/94124
464 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
469 - [`std::thread::available_parallelism`][available_parallelism]
470 - [`Result::copied`][result-copied]
471 - [`Result::cloned`][result-cloned]
472 - [`arch::asm!`][asm]
473 - [`arch::global_asm!`][global_asm]
474 - [`ops::ControlFlow::is_break`][is_break]
475 - [`ops::ControlFlow::is_continue`][is_continue]
476 - [`TryFrom<char> for u8`][try_from_char_u8]
477 - [`char::TryFromCharError`][try_from_char_err]
478 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
480 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
481 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
482 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
483 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
484 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
485 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
486 - [`DoubleEndedIterator for ToLowercase`][lowercase]
487 - [`DoubleEndedIterator for ToUppercase`][uppercase]
488 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
489 - [`UnwindSafe for Once`][unwindsafe_once]
490 - [`RefUnwindSafe for Once`][refunwindsafe_once]
491 - [armv8 neon intrinsics for aarch64][stdarch/1266]
495 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
496 - [`mem::MaybeUninit::assume_init`][muninit_init]
497 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
498 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
503 - [Stabilize the `strip` profile option][cargo/10088]
504 - [Stabilize future-incompat-report][cargo/10165]
505 - [Support abbreviating `--release` as `-r`][cargo/10133]
506 - [Support `term.quiet` configuration][cargo/10152]
507 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
512 - [Refactor weak symbols in std::sys::unix][90846]
513 This may add new, versioned, symbols when building with a newer glibc, as the
514 standard library uses weak linkage rather than dynamically attempting to load
515 certain symbols at runtime.
516 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
517 This adds a future compatibility lint to supporting the use of cfg_attr
518 wrapping either crate_type or crate_name specification within Rust files;
519 it is recommended that users migrate to setting the equivalent command line
521 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
522 This may expose new names, leading to conflicts with preexisting names in a
523 given namespace and a compilation failure.
524 - [Cargo will document libraries before binaries.][cargo/10172]
525 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
526 - [Weaken guarantee around advancing underlying iterators in zip][83791]
527 - [Make split_inclusive() on an empty slice yield an empty output][89825]
528 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
529 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
534 These changes provide no direct user facing benefits, but represent significant
535 improvements to the internals and overall performance of rustc
538 - [Fix many cases of normalization-related ICEs][91255]
539 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
540 - [Store liveness in interval sets for region inference][90637]
542 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
543 unstable feature.][91867]
545 [91867]: https://github.com/rust-lang/rust/issues/91867
546 [83744]: https://github.com/rust-lang/rust/pull/83744/
547 [83791]: https://github.com/rust-lang/rust/pull/83791/
548 [85013]: https://github.com/rust-lang/rust/pull/85013/
549 [89825]: https://github.com/rust-lang/rust/pull/89825/
550 [89999]: https://github.com/rust-lang/rust/pull/89999/
551 [90128]: https://github.com/rust-lang/rust/pull/90128/
552 [90207]: https://github.com/rust-lang/rust/pull/90207/
553 [90521]: https://github.com/rust-lang/rust/pull/90521/
554 [90586]: https://github.com/rust-lang/rust/pull/90586/
555 [90637]: https://github.com/rust-lang/rust/pull/90637/
556 [90833]: https://github.com/rust-lang/rust/pull/90833/
557 [90846]: https://github.com/rust-lang/rust/pull/90846/
558 [91003]: https://github.com/rust-lang/rust/pull/91003/
559 [91172]: https://github.com/rust-lang/rust/pull/91172/
560 [91255]: https://github.com/rust-lang/rust/pull/91255/
561 [91284]: https://github.com/rust-lang/rust/pull/91284/
562 [91535]: https://github.com/rust-lang/rust/pull/91535/
563 [91593]: https://github.com/rust-lang/rust/pull/91593/
564 [91728]: https://github.com/rust-lang/rust/pull/91728/
565 [91878]: https://github.com/rust-lang/rust/pull/91878/
566 [91896]: https://github.com/rust-lang/rust/pull/91896/
567 [91926]: https://github.com/rust-lang/rust/pull/91926/
568 [91984]: https://github.com/rust-lang/rust/pull/91984/
569 [92020]: https://github.com/rust-lang/rust/pull/92020/
570 [92034]: https://github.com/rust-lang/rust/pull/92034/
571 [92137]: https://github.com/rust-lang/rust/pull/92137/
572 [92483]: https://github.com/rust-lang/rust/pull/92483/
573 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
574 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
575 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
576 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
577 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
578 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
579 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
580 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
582 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
583 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
584 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
585 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
586 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
587 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
588 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
589 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
590 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
591 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
592 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
593 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
594 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
595 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
596 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
597 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
598 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
599 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
600 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
601 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
602 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
603 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
604 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
605 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
606 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
607 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
609 Version 1.58.1 (2022-01-19)
610 ===========================
612 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
613 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
614 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
615 * [Fix wrong error message displayed when some imports are missing][91254]
616 * [Fix rustfmt not formatting generated files from stdin][92912]
618 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
619 [91254]: https://github.com/rust-lang/rust/pull/91254
620 [92912]: https://github.com/rust-lang/rust/pull/92912
621 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
622 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
624 Version 1.58.0 (2022-01-13)
625 ==========================
630 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
631 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
632 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
637 - [Add LLVM CFI support to the Rust compiler][89652]
638 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
639 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
640 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
641 - [Update the minimum external LLVM to 12][90175]
642 - [Add `x86_64-unknown-none` at Tier 3*][89062]
643 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
644 - [Don't abort compilation after giving a lint error][87337]
645 - [Error messages point at the source of trait bound obligations in more places][89580]
647 \* Refer to Rust's [platform support page][platform-support-doc] for more
648 information on Rust's tiered platform support.
653 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
654 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
655 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
656 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
657 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
658 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
663 - [`Metadata::is_symlink`]
664 - [`Path::is_symlink`]
665 - [`{integer}::saturating_div`]
666 - [`Option::unwrap_unchecked`]
667 - [`Result::unwrap_unchecked`]
668 - [`Result::unwrap_err_unchecked`]
671 These APIs are now usable in const contexts:
674 - [`Duration::checked_add`]
675 - [`Duration::saturating_add`]
676 - [`Duration::checked_sub`]
677 - [`Duration::saturating_sub`]
678 - [`Duration::checked_mul`]
679 - [`Duration::saturating_mul`]
680 - [`Duration::checked_div`]
685 - [Add --message-format for install command][cargo/10107]
686 - [Warn when alias shadows external subcommand][cargo/10082]
691 - [Show all Deref implementations recursively in rustdoc][90183]
692 - [Use computed visibility in rustdoc][88447]
697 - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
698 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
699 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
700 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
701 - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
702 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
707 These changes provide no direct user facing benefits, but represent significant
708 improvements to the internals and overall performance of rustc
711 - [Implement coherence checks for negative trait impls][90104]
712 - [Add rustc lint, warning when iterating over hashmaps][89558]
713 - [Optimize live point computation][90491]
714 - [Enable verification for 1/32nd of queries loaded from disk][90361]
715 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
717 [87337]: https://github.com/rust-lang/rust/pull/87337/
718 [87467]: https://github.com/rust-lang/rust/pull/87467/
719 [87704]: https://github.com/rust-lang/rust/pull/87704/
720 [88041]: https://github.com/rust-lang/rust/pull/88041/
721 [88447]: https://github.com/rust-lang/rust/pull/88447/
722 [88601]: https://github.com/rust-lang/rust/pull/88601/
723 [89062]: https://github.com/rust-lang/rust/pull/89062/
724 [89174]: https://github.com/rust-lang/rust/pull/89174/
725 [89551]: https://github.com/rust-lang/rust/pull/89551/
726 [89558]: https://github.com/rust-lang/rust/pull/89558/
727 [89580]: https://github.com/rust-lang/rust/pull/89580/
728 [89652]: https://github.com/rust-lang/rust/pull/89652/
729 [90041]: https://github.com/rust-lang/rust/pull/90041/
730 [90058]: https://github.com/rust-lang/rust/pull/90058/
731 [90104]: https://github.com/rust-lang/rust/pull/90104/
732 [90117]: https://github.com/rust-lang/rust/pull/90117/
733 [90175]: https://github.com/rust-lang/rust/pull/90175/
734 [90183]: https://github.com/rust-lang/rust/pull/90183/
735 [90297]: https://github.com/rust-lang/rust/pull/90297/
736 [90329]: https://github.com/rust-lang/rust/pull/90329/
737 [90361]: https://github.com/rust-lang/rust/pull/90361/
738 [90417]: https://github.com/rust-lang/rust/pull/90417/
739 [90473]: https://github.com/rust-lang/rust/pull/90473/
740 [90491]: https://github.com/rust-lang/rust/pull/90491/
741 [90733]: https://github.com/rust-lang/rust/pull/90733/
742 [90833]: https://github.com/rust-lang/rust/pull/90833/
743 [90846]: https://github.com/rust-lang/rust/pull/90846/
744 [91026]: https://github.com/rust-lang/rust/pull/91026/
745 [91207]: https://github.com/rust-lang/rust/pull/91207/
746 [91255]: https://github.com/rust-lang/rust/pull/91255/
747 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
748 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
749 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
750 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
751 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
752 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
753 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
754 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
755 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
756 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
758 Version 1.57.0 (2021-12-02)
759 ==========================
764 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
765 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
766 - [Allow panicking in constant evaluation.][89508]
767 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
772 - [Create more accurate debuginfo for vtables.][89597]
773 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
774 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
775 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
776 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
778 \* Refer to Rust's [platform support page][platform-support-doc] for more
779 information on Rust's tiered platform support.
784 - [Avoid allocations and copying in `Vec::leak`][89337]
785 - [Add `#[repr(i8)]` to `Ordering`][89507]
786 - [Optimize `File::read_to_end` and `read_to_string`][89582]
787 - [Update to Unicode 14.0][89614]
788 - [Many more functions are marked `#[must_use]`][89692], producing a warning
789 when ignoring their return value. This helps catch mistakes such as expecting
790 a function to mutate a value in place rather than return a new value.
795 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
796 - [`[T; N]::as_slice`][`array::as_slice`]
797 - [`collections::TryReserveError`]
798 - [`HashMap::try_reserve`]
799 - [`HashSet::try_reserve`]
800 - [`String::try_reserve`]
801 - [`String::try_reserve_exact`]
802 - [`Vec::try_reserve`]
803 - [`Vec::try_reserve_exact`]
804 - [`VecDeque::try_reserve`]
805 - [`VecDeque::try_reserve_exact`]
806 - [`Iterator::map_while`]
808 - [`proc_macro::is_available`]
809 - [`Command::get_program`]
810 - [`Command::get_args`]
811 - [`Command::get_envs`]
812 - [`Command::get_current_dir`]
816 These APIs are now usable in const contexts:
818 - [`hint::unreachable_unchecked`]
823 - [Stabilize custom profiles][cargo/9943]
828 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
829 This will break some builds that set `#![deny(dead_code)]`.
833 These changes provide no direct user facing benefits, but represent significant
834 improvements to the internals and overall performance of rustc
837 - [Added an experimental backend for codegen with `libgccjit`.][87260]
839 [85200]: https://github.com/rust-lang/rust/pull/85200/
840 [86191]: https://github.com/rust-lang/rust/pull/86191/
841 [87220]: https://github.com/rust-lang/rust/pull/87220/
842 [87260]: https://github.com/rust-lang/rust/pull/87260/
843 [88321]: https://github.com/rust-lang/rust/pull/88321/
844 [88529]: https://github.com/rust-lang/rust/pull/88529/
845 [88690]: https://github.com/rust-lang/rust/pull/88690/
846 [88952]: https://github.com/rust-lang/rust/pull/88952/
847 [89337]: https://github.com/rust-lang/rust/pull/89337/
848 [89507]: https://github.com/rust-lang/rust/pull/89507/
849 [89508]: https://github.com/rust-lang/rust/pull/89508/
850 [89582]: https://github.com/rust-lang/rust/pull/89582/
851 [89597]: https://github.com/rust-lang/rust/pull/89597/
852 [89614]: https://github.com/rust-lang/rust/pull/89614/
853 [89692]: https://github.com/rust-lang/rust/issues/89692/
854 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
855 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
856 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
857 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
858 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
859 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
860 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
861 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
862 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
863 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
864 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
865 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
866 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
867 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
868 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
869 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
870 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
871 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
872 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
873 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
874 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
876 Version 1.56.1 (2021-11-01)
877 ===========================
879 - New lints to detect the presence of bidirectional-override Unicode
880 codepoints in the compiled source code ([CVE-2021-42574])
882 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
884 Version 1.56.0 (2021-10-21)
885 ========================
890 - [The 2021 Edition is now stable.][rust#88100]
891 See [the edition guide][rust-2021-edition-guide] for more details.
892 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
893 - [Union field access is permitted in `const fn`.][rust#85769]
895 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
900 - [Upgrade to LLVM 13.][rust#87570]
901 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
902 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
903 - [Warnings can be forced on with `--force-warn`.][rust#87472]
904 This feature is primarily intended for usage by `cargo fix`, rather than end users.
905 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
906 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
907 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
909 \* Refer to Rust's [platform support page][platform-support-doc] for more
910 information on Rust's tiered platform support.
915 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
916 The Windows console still requires valid Unicode, but this change allows
917 splitting a UTF-8 character across multiple write calls. This allows, for
918 instance, programs that just read and write data buffers (e.g. copying a file
919 to stdout) without regard for Unicode or character boundaries.
920 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
921 For this use case, atomics scale much better under contention.
922 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
923 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
924 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
925 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
926 - [Treat invalid environment variable names as non-existent.][rust#86183]
927 Previously, the environment functions would panic if given a variable name
928 with an internal null character or equal sign (`=`). Now, these functions will
929 just treat such names as non-existent variables, since the OS cannot represent
930 the existence of a variable with such a name.
935 - [`std::os::unix::fs::chroot`]
936 - [`UnsafeCell::raw_get`]
937 - [`BufWriter::into_parts`]
938 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
939 These APIs were previously stable in `std`, but are now also available in `core`.
941 - [`String::shrink_to`]
942 - [`OsString::shrink_to`]
943 - [`PathBuf::shrink_to`]
944 - [`BinaryHeap::shrink_to`]
945 - [`VecDeque::shrink_to`]
946 - [`HashMap::shrink_to`]
947 - [`HashSet::shrink_to`]
949 These APIs are now usable in const contexts:
951 - [`std::mem::transmute`]
952 - [`[T]::first`][`slice::first`]
953 - [`[T]::split_first`][`slice::split_first`]
954 - [`[T]::last`][`slice::last`]
955 - [`[T]::split_last`][`slice::split_last`]
960 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
961 This has no effect at present on dependency version selection.
962 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
963 that support Rust code to include a crate's specified minimum version in the test matrix for that
969 - [Update to new argument parsing rules on Windows.][rust#87580]
970 This adjusts Rust's standard library to match the behavior of the standard
971 libraries for C/C++. The rules have changed slightly over time, and this PR
972 brings us to the latest set of rules (changed in 2008).
973 - [Disallow the aapcs calling convention on aarch64][rust#88399]
974 This was already not supported by LLVM; this change surfaces this lack of
975 support with a better error message.
976 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
977 - [Warn when an escaped newline skips multiple lines.][rust#87671]
978 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
979 may return different values on glibc <= 2.24.][rust#81825]
980 Rust now invokes the `clone3` system call directly, when available, to use new functionality
981 available via that system call. Older versions of glibc cache the result of `getpid`, and only
982 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
983 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
987 These changes provide no direct user facing benefits, but represent significant
988 improvements to the internals and overall performance of rustc
991 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
992 This improves the performance of most Rust builds.
993 - [Unify representation of macros in internal data structures.][rust#88019]
994 This change fixes a host of bugs with the handling of macros by the compiler,
997 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
998 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
999 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
1000 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
1001 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
1002 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
1003 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
1004 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
1005 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
1006 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
1007 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
1008 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
1009 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
1010 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
1011 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
1012 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
1013 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
1014 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
1015 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
1016 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
1017 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
1018 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
1019 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
1020 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
1021 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
1022 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
1023 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
1024 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
1025 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
1026 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
1027 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
1028 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
1029 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
1030 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
1031 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
1032 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
1033 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
1034 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
1035 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
1036 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
1037 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
1038 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
1040 Version 1.55.0 (2021-09-09)
1041 ============================
1045 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
1046 will end at the maximum value of the integer.][83918]
1047 - [You can now explicitly import the prelude of different editions
1048 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
1052 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
1054 \* Refer to Rust's [platform support page][platform-support-doc] for more
1055 information on Rust's tiered platform support.
1060 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
1061 These improvements should in general provide faster string parsing of floats,
1062 no longer reject certain valid floating point values, and reduce
1063 the produced code size for non-stripped artifacts.
1064 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
1071 - [`IntoInnerError::into_error`]
1072 - [`IntoInnerError::into_parts`]
1073 - [`MaybeUninit::assume_init_mut`]
1074 - [`MaybeUninit::assume_init_ref`]
1075 - [`MaybeUninit::write`]
1077 - [`ops::ControlFlow`]
1079 - [`x86::_bittestandcomplement`]
1080 - [`x86::_bittestandreset`]
1081 - [`x86::_bittestandset`]
1082 - [`x86_64::_bittest64`]
1083 - [`x86_64::_bittestandcomplement64`]
1084 - [`x86_64::_bittestandreset64`]
1085 - [`x86_64::_bittestandset64`]
1087 The following previously stable functions are now `const`.
1089 - [`str::from_utf8_unchecked`]
1094 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
1095 rustc in parallel such as when using `cargo test`.][cargo/9675]
1096 - [The package definition in `cargo metadata` now includes the `"default_run"`
1097 field from the manifest.][cargo/9550]
1098 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
1099 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
1100 of packages.][cargo/9663]
1104 - [Added "Go to item on exact match" search option.][85876]
1105 - [The "Implementors" section on traits no longer shows redundant
1106 method definitions.][85970]
1107 - [Trait implementations are toggled open by default.][86260] This should make the
1108 implementations more searchable by tools like `CTRL+F` in your browser.
1109 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
1110 through type aliases.][86334]
1111 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
1112 "Trait Implementations" section.][86513]
1117 - [std functions that return an `io::Error` will no longer use the
1118 `ErrorKind::Other` variant.][85746] This is to better reflect that these
1119 kinds of errors could be categorised [into newer more specific `ErrorKind`
1120 variants][79965], and that they do not represent a user error.
1121 - [Using environment variable names with `process::Command` on Windows now
1122 behaves as expected.][85270] Previously using envionment variables with
1123 `Command` would cause them to be ASCII-uppercased.
1124 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
1125 with `rustdoc::`][86849]
1126 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
1127 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
1128 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
1131 [86849]: https://github.com/rust-lang/rust/pull/86849
1132 [86513]: https://github.com/rust-lang/rust/pull/86513
1133 [86334]: https://github.com/rust-lang/rust/pull/86334
1134 [86260]: https://github.com/rust-lang/rust/pull/86260
1135 [85970]: https://github.com/rust-lang/rust/pull/85970
1136 [85876]: https://github.com/rust-lang/rust/pull/85876
1137 [83572]: https://github.com/rust-lang/rust/pull/83572
1138 [86294]: https://github.com/rust-lang/rust/pull/86294
1139 [86858]: https://github.com/rust-lang/rust/pull/86858
1140 [86761]: https://github.com/rust-lang/rust/pull/86761
1141 [85746]: https://github.com/rust-lang/rust/pull/85746
1142 [85270]: https://github.com/rust-lang/rust/pull/85270
1143 [83918]: https://github.com/rust-lang/rust/pull/83918
1144 [79965]: https://github.com/rust-lang/rust/pull/79965
1145 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
1146 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
1147 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
1148 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
1149 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
1150 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
1151 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
1152 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
1153 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
1154 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
1155 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
1156 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
1157 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
1158 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
1159 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
1160 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
1161 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
1162 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
1163 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
1164 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
1165 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
1166 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
1169 Version 1.54.0 (2021-07-29)
1170 ============================
1173 -----------------------
1175 - [You can now use macros for values in some built-in attributes.][83366]
1176 This primarily allows you to call macros within the `#[doc]` attribute. For
1177 example, to include external documentation in your crate, you can now write
1180 #![doc = include_str!("README.md")]
1183 - [You can now cast between unsized slice types (and types which contain
1184 unsized slices) in `const fn`.][85078]
1185 - [You can now use multiple generic lifetimes with `impl Trait` where the
1186 lifetimes don't explicitly outlive another.][84701] In code this means
1187 that you can now have `impl Trait<'a, 'b>` where as before you could
1188 only have `impl Trait<'a, 'b> where 'b: 'a`.
1191 -----------------------
1193 - [Rustc will now search for custom JSON targets in
1194 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
1195 directory.][83800] You can find your sysroot directory by running
1196 `rustc --print sysroot`.
1197 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
1198 - [You can now use `#[target_feature]` on safe functions when targeting
1199 WebAssembly platforms.][84988]
1200 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
1201 - [Added tier 3\* support for `bpfel-unknown-none`
1202 and `bpfeb-unknown-none`.][79608]
1203 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
1205 \* Refer to Rust's [platform support page][platform-support-doc] for more
1206 information on Rust's tiered platform support.
1209 -----------------------
1211 - [`panic::panic_any` will now `#[track_caller]`.][85745]
1212 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
1213 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
1214 - [The implementations of vendor intrinsics in core::arch have been
1215 significantly refactored.][83278] The main user-visible changes are
1216 a 50% reduction in the size of libcore.rlib and stricter validation
1217 of constant operands passed to intrinsics. The latter is technically
1218 a breaking change, but allows Rust to more closely match the C vendor
1224 - [`BTreeMap::into_keys`]
1225 - [`BTreeMap::into_values`]
1226 - [`HashMap::into_keys`]
1227 - [`HashMap::into_values`]
1229 - [`VecDeque::binary_search`]
1230 - [`VecDeque::binary_search_by`]
1231 - [`VecDeque::binary_search_by_key`]
1232 - [`VecDeque::partition_point`]
1237 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
1238 the dependency graph.][cargo/9520]
1239 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
1240 in the tree ][cargo/9499]
1241 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
1242 macro dependencies.][cargo/9488]
1243 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
1244 This variable points to a directory that integration tests and benches
1245 can use as a "scratchpad" for testing filesystem operations.
1249 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
1250 - [Previously unsound code is no longer permitted where different constructors in branches
1251 could require different lifetimes.][85574]
1252 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
1253 than before and may reject some previously accepted code.
1254 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
1255 when compiled with `codegen-units = 1`.][86063]
1257 [85574]: https://github.com/rust-lang/rust/issues/85574
1258 [86831]: https://github.com/rust-lang/rust/issues/86831
1259 [86063]: https://github.com/rust-lang/rust/issues/86063
1260 [79608]: https://github.com/rust-lang/rust/pull/79608
1261 [84988]: https://github.com/rust-lang/rust/pull/84988
1262 [84701]: https://github.com/rust-lang/rust/pull/84701
1263 [84072]: https://github.com/rust-lang/rust/pull/84072
1264 [85745]: https://github.com/rust-lang/rust/pull/85745
1265 [84744]: https://github.com/rust-lang/rust/pull/84744
1266 [85078]: https://github.com/rust-lang/rust/pull/85078
1267 [84717]: https://github.com/rust-lang/rust/pull/84717
1268 [83800]: https://github.com/rust-lang/rust/pull/83800
1269 [83366]: https://github.com/rust-lang/rust/pull/83366
1270 [83278]: https://github.com/rust-lang/rust/pull/83278
1271 [85292]: https://github.com/rust-lang/rust/pull/85292
1272 [82834]: https://github.com/rust-lang/rust/pull/82834
1273 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
1274 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
1275 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
1276 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
1277 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
1278 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
1279 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
1280 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
1281 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
1282 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
1283 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
1285 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
1287 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
1289 Version 1.53.0 (2021-06-17)
1290 ============================
1293 -----------------------
1294 - [You can now use unicode for identifiers.][83799] This allows multilingual
1295 identifiers but still doesn't allow glyphs that are not considered characters
1296 such as `◆` or `🦀`. More specifically you can now use any identifier that
1297 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
1298 is the same standard as languages like Python, however Rust uses NFC
1299 normalization which may be different from other languages.
1300 - [You can now specify "or patterns" inside pattern matches.][79278]
1301 Previously you could only use `|` (OR) on complete patterns. E.g.
1305 matches!(x, Some(1) | Some(2));
1307 matches!(x, Some(1 | 2));
1309 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
1310 has the same semantics as the `:pat` matcher. This is to allow `:pat`
1311 to change semantics to being a pattern fragment in a future edition.
1314 -----------------------
1315 - [Updated the minimum external LLVM version to LLVM 10.][83387]
1316 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
1317 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
1319 \* Refer to Rust's [platform support page][platform-support-doc] for more
1320 information on Rust's tiered platform support.
1323 -----------------------
1324 - [Abort messages will now forward to `android_set_abort_message` on
1325 Android platforms when available.][81469]
1326 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
1327 - [Arrays of any length now implement `IntoIterator`.][84147]
1328 Currently calling `.into_iter()` as a method on an array will
1329 return `impl Iterator<Item=&T>`, but this may change in a
1330 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
1331 directly on arrays will provide `impl Iterator<Item=T>` as expected.
1332 - [`leading_zeros`, and `trailing_zeros` are now available on all
1333 `NonZero` integer types.][84082]
1334 - [`{f32, f64}::from_str` now parse and print special values
1335 (`NaN`, `-0`) according to IEEE 754.][78618]
1336 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
1337 - [Add the `BITS` associated constant to all numeric types.][82565]
1341 - [`AtomicBool::fetch_update`]
1342 - [`AtomicPtr::fetch_update`]
1343 - [`BTreeMap::retain`]
1344 - [`BTreeSet::retain`]
1345 - [`BufReader::seek_relative`]
1346 - [`DebugStruct::non_exhaustive`]
1348 - [`Duration::ZERO`]
1349 - [`Duration::is_zero`]
1350 - [`Duration::saturating_add`]
1351 - [`Duration::saturating_mul`]
1352 - [`Duration::saturating_sub`]
1353 - [`ErrorKind::Unsupported`]
1354 - [`Option::insert`]
1355 - [`Ordering::is_eq`]
1356 - [`Ordering::is_ge`]
1357 - [`Ordering::is_gt`]
1358 - [`Ordering::is_le`]
1359 - [`Ordering::is_lt`]
1360 - [`Ordering::is_ne`]
1361 - [`OsStr::is_ascii`]
1362 - [`OsStr::make_ascii_lowercase`]
1363 - [`OsStr::make_ascii_uppercase`]
1364 - [`OsStr::to_ascii_lowercase`]
1365 - [`OsStr::to_ascii_uppercase`]
1366 - [`Peekable::peek_mut`]
1367 - [`Rc::decrement_strong_count`]
1368 - [`Rc::increment_strong_count`]
1369 - [`Vec::extend_from_within`]
1370 - [`array::from_mut`]
1371 - [`array::from_ref`]
1372 - [`cmp::max_by_key`]
1374 - [`cmp::min_by_key`]
1376 - [`f32::is_subnormal`]
1377 - [`f64::is_subnormal`]
1380 -----------------------
1381 - [Cargo now supports git repositories where the default `HEAD` branch is not
1382 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
1383 which can handle default branches correctly.
1384 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
1385 - [The `authors` field is no longer included in `Cargo.toml` for new
1386 projects.][cargo/9282]
1389 -----------------------
1390 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
1391 without hyperlinks.][81764]
1395 - [Implement token-based handling of attributes during expansion][82608]
1396 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
1397 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
1398 to confusion and potential security vulnerabilities and [is no
1399 longer recommended][ietf6943].
1400 - [The added `BITS` constant may conflict with external definitions.][85667]
1401 In particular, this was known to be a problem in the `lexical-core` crate,
1402 but they have published fixes for semantic versions 0.4 through 0.7. To
1403 update this dependency alone, use `cargo update -p lexical-core`.
1404 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
1408 These changes provide no direct user facing benefits, but represent significant
1409 improvements to the internals and overall performance of rustc and
1412 - [Rework the `std::sys::windows::alloc` implementation.][83065]
1413 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
1414 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
1415 - [Rework rustdoc const type][82873]
1417 [85667]: https://github.com/rust-lang/rust/pull/85667
1418 [83386]: https://github.com/rust-lang/rust/pull/83386
1419 [82771]: https://github.com/rust-lang/rust/pull/82771
1420 [84147]: https://github.com/rust-lang/rust/pull/84147
1421 [84082]: https://github.com/rust-lang/rust/pull/84082
1422 [83799]: https://github.com/rust-lang/rust/pull/83799
1423 [83681]: https://github.com/rust-lang/rust/pull/83681
1424 [83652]: https://github.com/rust-lang/rust/pull/83652
1425 [83387]: https://github.com/rust-lang/rust/pull/83387
1426 [82873]: https://github.com/rust-lang/rust/pull/82873
1427 [82864]: https://github.com/rust-lang/rust/pull/82864
1428 [82608]: https://github.com/rust-lang/rust/pull/82608
1429 [82565]: https://github.com/rust-lang/rust/pull/82565
1430 [80525]: https://github.com/rust-lang/rust/pull/80525
1431 [79278]: https://github.com/rust-lang/rust/pull/79278
1432 [78618]: https://github.com/rust-lang/rust/pull/78618
1433 [77704]: https://github.com/rust-lang/rust/pull/77704
1434 [83941]: https://github.com/rust-lang/rust/pull/83941
1435 [83065]: https://github.com/rust-lang/rust/pull/83065
1436 [81764]: https://github.com/rust-lang/rust/pull/81764
1437 [81469]: https://github.com/rust-lang/rust/pull/81469
1438 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1439 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1440 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1441 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1442 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1443 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1444 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1445 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1446 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1447 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1448 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1449 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1450 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1451 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1452 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1453 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1454 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1455 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1456 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1457 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1458 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1459 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1460 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1461 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1462 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1463 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1464 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1465 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1466 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1467 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1468 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1469 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1470 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1471 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1472 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1473 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1474 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1475 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1476 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1477 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1478 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1481 Version 1.52.1 (2021-05-10)
1482 ============================
1484 This release disables incremental compilation, unless the user has explicitly
1485 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1487 This is due to the widespread, and frequently occurring, breakage encountered by
1488 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1489 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1490 newly added incremental verification are still present in past stable versions,
1491 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1494 These problems only affect incremental builds, so release builds with Cargo
1495 should not be affected unless the user has explicitly opted into incremental.
1496 Debug and check builds are affected.
1498 See [84970] for more details.
1500 [84970]: https://github.com/rust-lang/rust/issues/84970
1502 Version 1.52.0 (2021-05-06)
1503 ============================
1507 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1508 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1509 is allowed by default, and may become a warning or hard error in a
1511 - [You can now cast mutable references to arrays to a pointer of the same type as
1512 the element.][81479]
1516 - [Upgraded the default LLVM to LLVM 12.][81451]
1518 Added tier 3\* support for the following targets.
1520 - [`s390x-unknown-linux-musl`][82166]
1521 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1522 - [`powerpc-unknown-openbsd`][82733]
1524 \* Refer to Rust's [platform support page][platform-support-doc] for more
1525 information on Rust's tiered platform support.
1529 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1530 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1531 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1532 - [All integer division and remainder operations are now `const`.][80962]
1536 - [`Arguments::as_str`]
1538 - [`char::REPLACEMENT_CHARACTER`]
1539 - [`char::UNICODE_VERSION`]
1540 - [`char::decode_utf16`]
1541 - [`char::from_digit`]
1542 - [`char::from_u32_unchecked`]
1543 - [`char::from_u32`]
1544 - [`slice::partition_point`]
1545 - [`str::rsplit_once`]
1546 - [`str::split_once`]
1548 The following previously stable APIs are now `const`.
1550 - [`char::len_utf8`]
1551 - [`char::len_utf16`]
1552 - [`char::to_ascii_uppercase`]
1553 - [`char::to_ascii_lowercase`]
1554 - [`char::eq_ignore_ascii_case`]
1555 - [`u8::to_ascii_uppercase`]
1556 - [`u8::to_ascii_lowercase`]
1557 - [`u8::eq_ignore_ascii_case`]
1561 - [Rustdoc lints are now treated as a tool lint, meaning that
1562 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1563 Using the old style is still allowed, and will become a warning in
1565 - [Rustdoc now supports argument files.][82261]
1566 - [Rustdoc now generates smart punctuation for documentation.][79423]
1567 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1575 - [You can now pass multiple filters to tests.][81356] E.g.
1576 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1577 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1578 allowing you to see `std` symbols when debugging.][82218]
1582 These changes provide no direct user facing benefits, but represent significant
1583 improvements to the internals and overall performance of rustc and
1586 - [Check the result cache before the DepGraph when ensuring queries][81855]
1587 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1588 - [Only store a LocalDefId in some HIR nodes][81611]
1589 - [Store HIR attributes in a side table][79519]
1593 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1594 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1595 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1596 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1597 languages in code blocks.][78429]
1598 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1599 - [Changes in how proc macros handle whitespace may lead to panics when used
1600 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1601 - [Turn `#[derive]` into a regular macro attribute][79078]
1603 [84136]: https://github.com/rust-lang/rust/issues/84136
1604 [80763]: https://github.com/rust-lang/rust/pull/80763
1605 [82166]: https://github.com/rust-lang/rust/pull/82166
1606 [82121]: https://github.com/rust-lang/rust/pull/82121
1607 [81879]: https://github.com/rust-lang/rust/pull/81879
1608 [82261]: https://github.com/rust-lang/rust/pull/82261
1609 [82218]: https://github.com/rust-lang/rust/pull/82218
1610 [82216]: https://github.com/rust-lang/rust/pull/82216
1611 [82202]: https://github.com/rust-lang/rust/pull/82202
1612 [81855]: https://github.com/rust-lang/rust/pull/81855
1613 [81766]: https://github.com/rust-lang/rust/pull/81766
1614 [81744]: https://github.com/rust-lang/rust/pull/81744
1615 [81611]: https://github.com/rust-lang/rust/pull/81611
1616 [81479]: https://github.com/rust-lang/rust/pull/81479
1617 [81451]: https://github.com/rust-lang/rust/pull/81451
1618 [81356]: https://github.com/rust-lang/rust/pull/81356
1619 [80962]: https://github.com/rust-lang/rust/pull/80962
1620 [80553]: https://github.com/rust-lang/rust/pull/80553
1621 [80527]: https://github.com/rust-lang/rust/pull/80527
1622 [79519]: https://github.com/rust-lang/rust/pull/79519
1623 [79423]: https://github.com/rust-lang/rust/pull/79423
1624 [79208]: https://github.com/rust-lang/rust/pull/79208
1625 [78429]: https://github.com/rust-lang/rust/pull/78429
1626 [82733]: https://github.com/rust-lang/rust/pull/82733
1627 [82594]: https://github.com/rust-lang/rust/pull/82594
1628 [79078]: https://github.com/rust-lang/rust/pull/79078
1629 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1630 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1631 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1632 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1633 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1634 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1635 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1636 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1637 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1638 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1639 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1640 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1641 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1642 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1643 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1644 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1645 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1646 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1647 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1648 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1649 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1650 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1652 Version 1.51.0 (2021-03-25)
1653 ============================
1657 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1658 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1659 E.g. you can now write the following. Note: Only values of primitive integers,
1660 `bool`, or `char` types are currently permitted.
1662 struct GenericArray<T, const LENGTH: usize> {
1666 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1667 const fn last(&self) -> Option<&T> {
1671 Some(&self.inner[LENGTH - 1])
1681 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1682 This option controls whether debug information is split across multiple files
1683 or packed into a single file. **Note** This option is unstable on other platforms.
1684 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1685 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1686 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1687 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1689 \* Refer to Rust's [platform support page][platform-support-doc] for more
1690 information on Rust's tiered platform support.
1695 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1696 - [`str` now implements `AsMut<str>`.][80279]
1697 - [`u64` and `u128` now implement `From<char>`.][79502]
1698 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1699 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1700 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1701 - [`io::Empty` now implements `io::Seek`.][78044]
1702 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1703 `T: ?Sized` types.][80764]
1704 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1710 - [`Arc::decrement_strong_count`]
1711 - [`Arc::increment_strong_count`]
1712 - [`Once::call_once_force`]
1713 - [`Peekable::next_if_eq`]
1714 - [`Peekable::next_if`]
1715 - [`Seek::stream_position`]
1716 - [`array::IntoIter`]
1717 - [`panic::panic_any`]
1719 - [`ptr::addr_of_mut!`]
1720 - [`slice::fill_with`]
1721 - [`slice::split_inclusive_mut`]
1722 - [`slice::split_inclusive`]
1723 - [`slice::strip_prefix`]
1724 - [`slice::strip_suffix`]
1725 - [`str::split_inclusive`]
1726 - [`sync::OnceState`]
1728 - [`VecDeque::range`]
1729 - [`VecDeque::range_mut`]
1733 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1734 codegen option.][cargo/9112]
1735 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1736 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1737 to avoid unifying features of dependencies where that unification could be unwanted.
1738 Such as using the same dependency with a `std` feature in a build scripts and
1739 proc-macros, while using the `no-std` feature in the final binary. See the
1740 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1745 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1746 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1747 documentation.][79642]
1749 Various improvements to intra-doc links:
1751 - [You can link to non-path primitives such as `slice`.][80181]
1752 - [You can link to associated items.][74489]
1753 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1757 - [You can now pass `--include-ignored` to tests (e.g. with
1758 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1763 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1764 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1766 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1767 for the distributed artifacts.][81521]
1768 - `armv5te-unknown-linux-gnueabi`
1769 - `sparc64-unknown-linux-gnu`
1770 - `thumbv7neon-unknown-linux-gnueabihf`
1771 - `armv7-unknown-linux-gnueabi`
1772 - `x86_64-unknown-linux-gnux32`
1773 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1778 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1780 [79135]: https://github.com/rust-lang/rust/pull/79135
1781 [74489]: https://github.com/rust-lang/rust/pull/74489
1782 [76934]: https://github.com/rust-lang/rust/pull/76934
1783 [79570]: https://github.com/rust-lang/rust/pull/79570
1784 [80181]: https://github.com/rust-lang/rust/pull/80181
1785 [79642]: https://github.com/rust-lang/rust/pull/79642
1786 [80945]: https://github.com/rust-lang/rust/pull/80945
1787 [80279]: https://github.com/rust-lang/rust/pull/80279
1788 [80053]: https://github.com/rust-lang/rust/pull/80053
1789 [79502]: https://github.com/rust-lang/rust/pull/79502
1790 [75180]: https://github.com/rust-lang/rust/pull/75180
1791 [81521]: https://github.com/rust-lang/rust/pull/81521
1792 [80968]: https://github.com/rust-lang/rust/pull/80968
1793 [80959]: https://github.com/rust-lang/rust/pull/80959
1794 [80718]: https://github.com/rust-lang/rust/pull/80718
1795 [80653]: https://github.com/rust-lang/rust/pull/80653
1796 [80579]: https://github.com/rust-lang/rust/pull/80579
1797 [79998]: https://github.com/rust-lang/rust/pull/79998
1798 [78044]: https://github.com/rust-lang/rust/pull/78044
1799 [81455]: https://github.com/rust-lang/rust/pull/81455
1800 [80764]: https://github.com/rust-lang/rust/pull/80764
1801 [80749]: https://github.com/rust-lang/rust/pull/80749
1802 [80662]: https://github.com/rust-lang/rust/pull/80662
1803 [79134]: https://github.com/rust-lang/rust/pull/79134
1804 [80966]: https://github.com/rust-lang/rust/pull/80966
1805 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1806 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1807 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1808 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1809 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1810 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1811 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1812 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1813 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1814 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1815 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1816 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1817 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1818 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1819 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1820 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1821 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1822 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1823 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1824 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1825 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1826 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1827 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1829 Version 1.50.0 (2021-02-11)
1830 ============================
1833 -----------------------
1834 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1835 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1836 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1839 -----------------------
1840 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1841 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1842 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1843 - [Dropped support for all cloudabi targets.][78439]
1845 \* Refer to Rust's [platform support page][platform-support-doc] for more
1846 information on Rust's tiered platform support.
1849 -----------------------
1851 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1852 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1853 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1854 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1855 up the same amount of space as `File`.
1861 - [`btree_map::Entry::or_insert_with_key`]
1864 - [`hash_map::Entry::or_insert_with_key`]
1868 - [`UnsafeCell::get_mut`]
1870 The following previously stable methods are now `const`.
1872 - [`IpAddr::is_ipv4`]
1873 - [`IpAddr::is_ipv6`]
1874 - [`IpAddr::is_unspecified`]
1875 - [`IpAddr::is_loopback`]
1876 - [`IpAddr::is_multicast`]
1877 - [`Ipv4Addr::octets`]
1878 - [`Ipv4Addr::is_loopback`]
1879 - [`Ipv4Addr::is_private`]
1880 - [`Ipv4Addr::is_link_local`]
1881 - [`Ipv4Addr::is_multicast`]
1882 - [`Ipv4Addr::is_broadcast`]
1883 - [`Ipv4Addr::is_documentation`]
1884 - [`Ipv4Addr::to_ipv6_compatible`]
1885 - [`Ipv4Addr::to_ipv6_mapped`]
1886 - [`Ipv6Addr::segments`]
1887 - [`Ipv6Addr::is_unspecified`]
1888 - [`Ipv6Addr::is_loopback`]
1889 - [`Ipv6Addr::is_multicast`]
1890 - [`Ipv6Addr::to_ipv4`]
1893 - [`Layout::from_size_align`]
1894 - `pow` for all integer types.
1895 - `checked_pow` for all integer types.
1896 - `saturating_pow` for all integer types.
1897 - `wrapping_pow` for all integer types.
1898 - `next_power_of_two` for all unsigned integer types.
1899 - `checked_next_power_of_two` for all unsigned integer types.
1902 -----------------------
1904 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1905 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1906 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1907 contents of that directory for changes.][cargo/8973]
1908 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1913 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1914 - [Running tests will now print the total time taken to execute.][75752]
1919 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1920 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1921 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1922 unhygenic `macro_rules!` macros.][79472]
1923 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1924 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1925 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1926 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1927 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1928 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1930 [74989]: https://github.com/rust-lang/rust/pull/74989
1931 [79261]: https://github.com/rust-lang/rust/pull/79261
1932 [79896]: https://github.com/rust-lang/rust/pull/79896
1933 [79484]: https://github.com/rust-lang/rust/pull/79484
1934 [79472]: https://github.com/rust-lang/rust/pull/79472
1935 [79270]: https://github.com/rust-lang/rust/pull/79270
1936 [79003]: https://github.com/rust-lang/rust/pull/79003
1937 [78864]: https://github.com/rust-lang/rust/pull/78864
1938 [78636]: https://github.com/rust-lang/rust/pull/78636
1939 [78439]: https://github.com/rust-lang/rust/pull/78439
1940 [78343]: https://github.com/rust-lang/rust/pull/78343
1941 [78296]: https://github.com/rust-lang/rust/pull/78296
1942 [78068]: https://github.com/rust-lang/rust/pull/78068
1943 [75752]: https://github.com/rust-lang/rust/pull/75752
1944 [74699]: https://github.com/rust-lang/rust/pull/74699
1945 [78142]: https://github.com/rust-lang/rust/pull/78142
1946 [77484]: https://github.com/rust-lang/rust/pull/77484
1947 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1948 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1949 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1950 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1951 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1952 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1953 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1954 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1955 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1956 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1957 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1958 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1959 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1960 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1961 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1962 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1963 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1964 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1965 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1966 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1967 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1968 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1969 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1970 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1971 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1972 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1973 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1974 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1975 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1976 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
1977 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1978 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1979 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
1980 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1983 Version 1.49.0 (2020-12-31)
1984 ============================
1987 -----------------------
1989 - [Unions can now implement `Drop`, and you can now have a field in a union
1990 with `ManuallyDrop<T>`.][77547]
1991 - [You can now cast uninhabited enums to integers.][76199]
1992 - [You can now bind by reference and by move in patterns.][76119] This
1993 allows you to selectively borrow individual components of a type. E.g.
2001 let person = Person {
2002 name: String::from("Alice"),
2006 // `name` is moved out of person, but `age` is referenced.
2007 let Person { name, ref age } = person;
2008 println!("{} {}", name, age);
2012 -----------------------
2014 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
2015 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
2016 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
2017 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
2018 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
2019 - [Output from threads spawned in tests is now captured.][78227]
2020 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
2022 \* Refer to Rust's [platform support page][platform-support-doc] for more
2023 information on Rust's tiered platform support.
2026 -----------------------
2028 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
2029 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
2034 - [`slice::select_nth_unstable`]
2035 - [`slice::select_nth_unstable_by`]
2036 - [`slice::select_nth_unstable_by_key`]
2038 The following previously stable methods are now `const`.
2040 - [`Poll::is_ready`]
2041 - [`Poll::is_pending`]
2044 -----------------------
2045 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
2046 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
2047 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
2048 variable will be set if the crate being built is one the user selected to build, either
2049 with `-p` or through defaults.
2050 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
2056 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
2057 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
2058 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
2059 Previously such invalid or unused attributes could be ignored.
2060 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
2061 read [this post about the changes][rustdoc-ws-post] for more details.
2062 - [Trait bounds are no longer inferred for associated types.][79904]
2066 These changes provide no direct user facing benefits, but represent significant
2067 improvements to the internals and overall performance of rustc and
2070 - [rustc's internal crates are now compiled using the `initial-exec` Thread
2071 Local Storage model.][78201]
2072 - [Calculate visibilities once in resolve.][78077]
2073 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
2074 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
2077 [75991]: https://github.com/rust-lang/rust/pull/75991
2078 [78951]: https://github.com/rust-lang/rust/pull/78951
2079 [78848]: https://github.com/rust-lang/rust/pull/78848
2080 [78746]: https://github.com/rust-lang/rust/pull/78746
2081 [78376]: https://github.com/rust-lang/rust/pull/78376
2082 [78228]: https://github.com/rust-lang/rust/pull/78228
2083 [78227]: https://github.com/rust-lang/rust/pull/78227
2084 [78201]: https://github.com/rust-lang/rust/pull/78201
2085 [78109]: https://github.com/rust-lang/rust/pull/78109
2086 [78077]: https://github.com/rust-lang/rust/pull/78077
2087 [77997]: https://github.com/rust-lang/rust/pull/77997
2088 [77703]: https://github.com/rust-lang/rust/pull/77703
2089 [77547]: https://github.com/rust-lang/rust/pull/77547
2090 [77015]: https://github.com/rust-lang/rust/pull/77015
2091 [76199]: https://github.com/rust-lang/rust/pull/76199
2092 [76119]: https://github.com/rust-lang/rust/pull/76119
2093 [75914]: https://github.com/rust-lang/rust/pull/75914
2094 [79004]: https://github.com/rust-lang/rust/pull/79004
2095 [78676]: https://github.com/rust-lang/rust/pull/78676
2096 [79904]: https://github.com/rust-lang/rust/issues/79904
2097 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
2098 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
2099 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
2100 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
2101 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
2102 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
2103 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
2104 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
2105 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
2106 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
2108 Version 1.48.0 (2020-11-19)
2109 ==========================
2114 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
2115 is still rejected *semantically*, but can now be parsed by procedural macros.
2119 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
2120 `rustc` whether to link its own C runtime and libraries or to rely on a external
2121 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
2122 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
2123 Note: If you're using cargo you must explicitly pass the `--target` flag.
2124 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
2126 \* Refer to Rust's [platform support page][platform-support-doc] for more
2127 information on Rust's tiered platform support.
2131 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
2132 and `&Stderr`.][76275]
2133 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
2134 - [The `matches!` macro now supports having a trailing comma.][74880]
2135 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
2136 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
2140 - [`slice::as_ptr_range`]
2141 - [`slice::as_mut_ptr_range`]
2142 - [`VecDeque::make_contiguous`]
2143 - [`future::pending`]
2146 The following previously stable methods are now `const fn`'s:
2148 - [`Option::is_some`]
2149 - [`Option::is_none`]
2150 - [`Option::as_ref`]
2152 - [`Result::is_err`]
2153 - [`Result::as_ref`]
2154 - [`Ordering::reverse`]
2155 - [`Ordering::then`]
2162 - [You can now link to items in `rustdoc` using the intra-doc link
2163 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
2164 a link to `std::future`'s documentation. See ["Linking to items by
2165 name"][intradoc-links] for more information.
2166 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
2167 when searching through `rustdoc`'s UI.][75740]
2171 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
2172 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
2173 promoted to `'static` lifetime any more inside `const fn`s.
2174 - [Associated type bindings on trait objects are now verified to meet the bounds
2175 declared on the trait when checking that they implement the trait.][27675]
2176 - [When trait bounds on associated types or opaque types are ambiguous, the
2177 compiler no longer makes an arbitrary choice on which bound to use.][54121]
2178 - [Fixed recursive nonterminals not being expanded in macros during
2179 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
2180 correctly handling recursive nonterminal tokens.
2181 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
2182 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
2183 in places where they have no effect.][73461]
2184 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
2185 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
2186 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
2187 disallow zero-initialization.][71274]
2188 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
2189 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
2190 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
2191 see the [`catch_unwind`] documentation for further information.
2197 These changes provide no direct user facing benefits, but represent significant
2198 improvements to the internals and overall performance of rustc and
2201 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
2202 You can continue building with `make` by setting `ninja=false` in
2204 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
2205 - [Made `ensure_sufficient_stack()` non-generic][76680]
2207 [78143]: https://github.com/rust-lang/rust/issues/78143
2208 [76680]: https://github.com/rust-lang/rust/pull/76680/
2209 [76030]: https://github.com/rust-lang/rust/pull/76030/
2210 [70212]: https://github.com/rust-lang/rust/pull/70212/
2211 [27675]: https://github.com/rust-lang/rust/issues/27675/
2212 [54121]: https://github.com/rust-lang/rust/issues/54121/
2213 [71274]: https://github.com/rust-lang/rust/pull/71274/
2214 [77386]: https://github.com/rust-lang/rust/pull/77386/
2215 [77153]: https://github.com/rust-lang/rust/pull/77153/
2216 [77055]: https://github.com/rust-lang/rust/pull/77055/
2217 [76275]: https://github.com/rust-lang/rust/pull/76275/
2218 [76310]: https://github.com/rust-lang/rust/pull/76310/
2219 [76420]: https://github.com/rust-lang/rust/pull/76420/
2220 [76158]: https://github.com/rust-lang/rust/pull/76158/
2221 [75857]: https://github.com/rust-lang/rust/pull/75857/
2222 [75585]: https://github.com/rust-lang/rust/pull/75585/
2223 [75740]: https://github.com/rust-lang/rust/pull/75740/
2224 [75502]: https://github.com/rust-lang/rust/pull/75502/
2225 [74880]: https://github.com/rust-lang/rust/pull/74880/
2226 [74922]: https://github.com/rust-lang/rust/pull/74922/
2227 [74430]: https://github.com/rust-lang/rust/pull/74430/
2228 [74194]: https://github.com/rust-lang/rust/pull/74194/
2229 [73461]: https://github.com/rust-lang/rust/pull/73461/
2230 [73166]: https://github.com/rust-lang/rust/pull/73166/
2231 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
2232 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
2233 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
2234 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
2235 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
2236 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
2237 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
2238 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
2239 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
2240 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
2241 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
2242 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
2243 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
2244 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
2245 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
2248 Version 1.47.0 (2020-10-08)
2249 ==========================
2253 - [Closures will now warn when not used.][74869]
2257 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
2258 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
2260 - [Upgraded to LLVM 11.][73526]
2261 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
2262 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
2263 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
2265 \* Refer to Rust's [platform support page][platform-support-doc] for more
2266 information on Rust's tiered platform support.
2270 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
2271 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
2272 those of length less than 33.][74060]
2273 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
2274 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
2275 `PartialEq`, and `PartialOrd`.][73583]
2279 - [`Ident::new_raw`]
2280 - [`Range::is_empty`]
2281 - [`RangeInclusive::is_empty`]
2282 - [`Result::as_deref`]
2283 - [`Result::as_deref_mut`]
2285 - [`pointer::offset_from`]
2289 The following previously stable APIs have now been made const.
2291 - [The `new` method for all `NonZero` integers.][73858]
2292 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
2293 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
2294 methods for all integers.][73858]
2295 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
2296 signed integers.][73858]
2297 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
2298 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
2299 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
2300 `is_ascii_control` methods for `char` and `u8`.][73858]
2304 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
2305 You can override this by setting the following in your `Cargo.toml`.
2307 [profile.release.build-override]
2310 - [`cargo-help` will now display man pages for commands rather just the
2311 `--help` text.][cargo/8456]
2312 - [`cargo-metadata` now emits a `test` field indicating if a target has
2313 tests enabled.][cargo/8478]
2314 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
2315 - [`cargo-publish` will now use an alternative registry by default if it's the
2316 only registry specified in `package.publish`.][cargo/8571]
2320 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
2321 type based search.][75366]
2322 - [Added the Ayu theme to rustdoc.][71237]
2326 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
2327 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
2328 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
2329 help to preserve more span information.][73084] These changes may cause
2330 compiliation errors if your macro was unhygenic or didn't correctly handle
2332 - [Moved support for the CloudABI target to tier 3.][75568]
2333 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
2334 - [Added the `rustc-docs` component.][75560] This allows you to install
2335 and read the documentation for the compiler internal APIs. (Currently only
2336 available for `x86_64-unknown-linux-gnu`.)
2341 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
2343 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
2344 [75048]: https://github.com/rust-lang/rust/pull/75048/
2345 [74163]: https://github.com/rust-lang/rust/pull/74163/
2346 [71237]: https://github.com/rust-lang/rust/pull/71237/
2347 [74869]: https://github.com/rust-lang/rust/pull/74869/
2348 [73858]: https://github.com/rust-lang/rust/pull/73858/
2349 [75716]: https://github.com/rust-lang/rust/pull/75716/
2350 [75560]: https://github.com/rust-lang/rust/pull/75560/
2351 [75568]: https://github.com/rust-lang/rust/pull/75568/
2352 [75366]: https://github.com/rust-lang/rust/pull/75366/
2353 [75204]: https://github.com/rust-lang/rust/pull/75204/
2354 [74650]: https://github.com/rust-lang/rust/pull/74650/
2355 [74419]: https://github.com/rust-lang/rust/pull/74419/
2356 [73964]: https://github.com/rust-lang/rust/pull/73964/
2357 [74021]: https://github.com/rust-lang/rust/pull/74021/
2358 [74060]: https://github.com/rust-lang/rust/pull/74060/
2359 [73893]: https://github.com/rust-lang/rust/pull/73893/
2360 [73526]: https://github.com/rust-lang/rust/pull/73526/
2361 [73583]: https://github.com/rust-lang/rust/pull/73583/
2362 [73084]: https://github.com/rust-lang/rust/pull/73084/
2363 [73197]: https://github.com/rust-lang/rust/pull/73197/
2364 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
2365 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
2366 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
2367 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
2368 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
2369 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
2370 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
2371 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
2372 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
2373 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
2374 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
2375 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
2376 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
2377 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
2380 Version 1.46.0 (2020-08-27)
2381 ==========================
2385 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
2386 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
2387 const functions.][73862]
2388 - [The `#[track_caller]` attribute can now be added to functions to use the
2389 function's caller's location information for panic messages.][72445]
2390 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
2391 `x.0.0` over `(x.0).0`.
2392 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
2393 You currently can't use `mem::transmute` in constant functions.
2397 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
2398 - [Enabled static "Position Independent Executables" by default
2399 for `x86_64-unknown-linux-musl`.][70740]
2403 - [`mem::forget` is now a `const fn`.][73887]
2404 - [`String` now implements `From<char>`.][73466]
2405 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
2406 integer types.][73032]
2407 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
2408 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
2409 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
2410 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
2411 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
2412 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
2417 - [`vec::Drain::as_slice`]
2421 Added a number of new environment variables that are now available when
2422 compiling your crate.
2424 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2425 the specific binary being compiled and the name of the crate.
2426 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2427 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2431 - [The target configuration option `abi_blacklist` has been renamed
2432 to `unsupported_abis`.][74150] The old name will still continue to work.
2433 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2434 This was previously accepted but will become a hard error in a future release.
2435 - [Rustc will fail to compile if you have a struct with
2436 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2438 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2439 ensure that spans have the correct information, and may cause breakage if you
2440 were relying on receiving spans with dummy information.
2441 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2442 a legacy installer that was replaced by a MSI installer a few years ago but
2443 was still being built.
2444 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2445 - [Rustc will no longer accept overlapping trait implementations that only
2446 differ in how the lifetime was bound.][72493]
2447 - [Rustc now correctly relates the lifetime of an existential associated
2448 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2449 you to pass a shorter lifetime than expected.
2450 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2451 The library will need to be installed for `rustc` to work, even though we
2452 expect it to be already available on most systems.
2453 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2455 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2456 exact output returned by rustc's pretty printing is an unstable
2457 implementation detail: we recommend any macro relying on it to switch to a
2458 more robust parsing system.
2460 [75453]: https://github.com/rust-lang/rust/issues/75453/
2461 [74820]: https://github.com/rust-lang/rust/issues/74820/
2462 [74420]: https://github.com/rust-lang/rust/issues/74420/
2463 [74109]: https://github.com/rust-lang/rust/pull/74109/
2464 [74150]: https://github.com/rust-lang/rust/pull/74150/
2465 [73862]: https://github.com/rust-lang/rust/pull/73862/
2466 [73887]: https://github.com/rust-lang/rust/pull/73887/
2467 [73466]: https://github.com/rust-lang/rust/pull/73466/
2468 [73516]: https://github.com/rust-lang/rust/pull/73516/
2469 [73293]: https://github.com/rust-lang/rust/pull/73293/
2470 [73007]: https://github.com/rust-lang/rust/pull/73007/
2471 [73032]: https://github.com/rust-lang/rust/pull/73032/
2472 [72920]: https://github.com/rust-lang/rust/pull/72920/
2473 [72569]: https://github.com/rust-lang/rust/pull/72569/
2474 [72583]: https://github.com/rust-lang/rust/pull/72583/
2475 [72584]: https://github.com/rust-lang/rust/pull/72584/
2476 [72717]: https://github.com/rust-lang/rust/pull/72717/
2477 [72437]: https://github.com/rust-lang/rust/pull/72437/
2478 [72445]: https://github.com/rust-lang/rust/pull/72445/
2479 [72486]: https://github.com/rust-lang/rust/pull/72486/
2480 [72493]: https://github.com/rust-lang/rust/pull/72493/
2481 [72331]: https://github.com/rust-lang/rust/pull/72331/
2482 [71896]: https://github.com/rust-lang/rust/pull/71896/
2483 [71660]: https://github.com/rust-lang/rust/pull/71660/
2484 [71322]: https://github.com/rust-lang/rust/pull/71322/
2485 [70740]: https://github.com/rust-lang/rust/pull/70740/
2486 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2487 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2488 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2489 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2490 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2493 Version 1.45.2 (2020-08-03)
2494 ==========================
2496 * [Fix bindings in tuple struct patterns][74954]
2497 * [Fix track_caller integration with trait objects][74784]
2499 [74954]: https://github.com/rust-lang/rust/issues/74954
2500 [74784]: https://github.com/rust-lang/rust/issues/74784
2503 Version 1.45.1 (2020-07-30)
2504 ==========================
2506 * [Fix const propagation with references.][73613]
2507 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2508 * [Avoid spurious implicit region bound.][74509]
2509 * [Install clippy on x.py install][74457]
2511 [73613]: https://github.com/rust-lang/rust/pull/73613
2512 [73078]: https://github.com/rust-lang/rust/issues/73078
2513 [74509]: https://github.com/rust-lang/rust/pull/74509
2514 [74457]: https://github.com/rust-lang/rust/pull/74457
2517 Version 1.45.0 (2020-07-16)
2518 ==========================
2522 - [Out of range float to int conversions using `as` has been defined as a saturating
2523 conversion.][71269] This was previously undefined behaviour, but you can use the
2524 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2525 may be desirable in rare performance sensitive situations.
2526 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2527 using `u64`.][70705]
2528 - [Function like procedural macros can now be used in expression, pattern, and statement
2529 positions.][68717] This means you can now use a function-like procedural macro
2530 anywhere you can use a declarative (`macro_rules!`) macro.
2534 - [You can now override individual target features through the `target-feature`
2535 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2536 equivalent to `-C target-feature=+avx2,+fma`.
2537 - [Added the `force-unwind-tables` flag.][69984] This option allows
2538 rustc to always generate unwind tables regardless of panic strategy.
2539 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2540 to include LLVM bitcode into generated `rlib`s (this is on by default).
2541 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2542 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2543 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2544 - [Upgraded to LLVM 10.][67759]
2546 \* Refer to Rust's [platform support page][platform-support-doc] for more
2547 information on Rust's tiered platform support.
2552 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2554 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2555 - [You can now use `char` with
2556 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2557 a range of codepoints.][72413] E.g.
2558 you can now write the following;
2560 for ch in 'a'..='z' {
2564 // Prints "abcdefghijklmnopqrstuvwxyz"
2566 - [`OsString` now implements `FromStr`.][71662]
2567 - [The `saturating_neg` method has been added to all signed integer primitive
2568 types, and the `saturating_abs` method has been added for all integer
2569 primitive types.][71886]
2570 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2571 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2573 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2574 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2575 integer types.][69813]
2576 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2577 integer types.][72324]
2578 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2583 - [`BTreeMap::remove_entry`]
2585 - [`rc::Weak::as_ptr`]
2586 - [`rc::Weak::from_raw`]
2587 - [`rc::Weak::into_raw`]
2588 - [`str::strip_prefix`]
2589 - [`str::strip_suffix`]
2590 - [`sync::Weak::as_ptr`]
2591 - [`sync::Weak::from_raw`]
2592 - [`sync::Weak::into_raw`]
2593 - [`char::UNICODE_VERSION`]
2594 - [`Span::resolved_at`]
2595 - [`Span::located_at`]
2596 - [`Span::mixed_site`]
2597 - [`unix::process::CommandExt::arg0`]
2602 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2607 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2608 `~~outdated information~~` becomes "~~outdated information~~".
2609 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2613 - [Trying to self initialize a static value (that is creating a value using
2614 itself) is unsound and now causes a compile error.][71140]
2615 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2616 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2617 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2618 previously undocumented and not intended for public use. Rustdoc still provides
2619 a non-zero exit code on errors.
2620 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2621 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2622 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2623 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2624 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2628 - [Make clippy a git subtree instead of a git submodule][70655]
2629 - [Unify the undo log of all snapshot types][69464]
2631 [71848]: https://github.com/rust-lang/rust/issues/71848/
2632 [73420]: https://github.com/rust-lang/rust/issues/73420/
2633 [72324]: https://github.com/rust-lang/rust/pull/72324/
2634 [71843]: https://github.com/rust-lang/rust/pull/71843/
2635 [71886]: https://github.com/rust-lang/rust/pull/71886/
2636 [72234]: https://github.com/rust-lang/rust/pull/72234/
2637 [72239]: https://github.com/rust-lang/rust/pull/72239/
2638 [72397]: https://github.com/rust-lang/rust/pull/72397/
2639 [72413]: https://github.com/rust-lang/rust/pull/72413/
2640 [72014]: https://github.com/rust-lang/rust/pull/72014/
2641 [72062]: https://github.com/rust-lang/rust/pull/72062/
2642 [72094]: https://github.com/rust-lang/rust/pull/72094/
2643 [72133]: https://github.com/rust-lang/rust/pull/72133/
2644 [67759]: https://github.com/rust-lang/rust/pull/67759/
2645 [71900]: https://github.com/rust-lang/rust/pull/71900/
2646 [71928]: https://github.com/rust-lang/rust/pull/71928/
2647 [71662]: https://github.com/rust-lang/rust/pull/71662/
2648 [71716]: https://github.com/rust-lang/rust/pull/71716/
2649 [71447]: https://github.com/rust-lang/rust/pull/71447/
2650 [71269]: https://github.com/rust-lang/rust/pull/71269/
2651 [71095]: https://github.com/rust-lang/rust/pull/71095/
2652 [71140]: https://github.com/rust-lang/rust/pull/71140/
2653 [70655]: https://github.com/rust-lang/rust/pull/70655/
2654 [70705]: https://github.com/rust-lang/rust/pull/70705/
2655 [69984]: https://github.com/rust-lang/rust/pull/69984/
2656 [69813]: https://github.com/rust-lang/rust/pull/69813/
2657 [69464]: https://github.com/rust-lang/rust/pull/69464/
2658 [68717]: https://github.com/rust-lang/rust/pull/68717/
2659 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2660 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2661 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2662 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2663 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2664 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2665 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2666 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2667 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2668 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2669 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2670 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2671 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2672 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2673 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2674 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2675 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2678 Version 1.44.1 (2020-06-18)
2679 ===========================
2681 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2682 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2683 * [Fix crashes when finding backtrace on macOS.][71397]
2684 * [Clippy applies lint levels into different files.][clippy/5356]
2686 [71397]: https://github.com/rust-lang/rust/issues/71397
2687 [73078]: https://github.com/rust-lang/rust/issues/73078
2688 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2689 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2692 Version 1.44.0 (2020-06-04)
2693 ==========================
2697 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2698 - [Added the `unused_braces` lint.][70081]
2700 **Syntax-only changes**
2702 - [Expansion-driven outline module parsing][69838]
2707 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2712 These are still rejected semantically, so you will likely receive an error but
2713 these changes can be seen and parsed by macros and conditional compilation.
2717 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2718 Additionally when in incremental mode rustc defaults to 256 codegen units.
2719 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2720 a panic is thrown.][67502]
2721 - [Added tier 3\* support for the `aarch64-unknown-none` and
2722 `aarch64-unknown-none-softfloat` targets.][68334]
2723 - [Added tier 3 support for `arm64-apple-tvos` and
2724 `x86_64-apple-tvos` targets.][68191]
2729 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2730 `vec![]` to be able to be used in `const` contexts.
2731 - [`convert::Infallible` now implements `Hash`.][70281]
2732 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2733 a `&mut OsStr`.][70048]
2734 - [Unicode 13 is now supported.][69929]
2735 - [`String` now implements `From<&mut str>`.][69661]
2736 - [`IoSlice` now implements `Copy`.][69403]
2737 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2738 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2739 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2740 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2741 integer types.][69373]
2745 - [`PathBuf::with_capacity`]
2746 - [`PathBuf::capacity`]
2747 - [`PathBuf::clear`]
2748 - [`PathBuf::reserve`]
2749 - [`PathBuf::reserve_exact`]
2750 - [`PathBuf::shrink_to_fit`]
2751 - [`f32::to_int_unchecked`]
2752 - [`f64::to_int_unchecked`]
2753 - [`Layout::align_to`]
2754 - [`Layout::pad_to_align`]
2756 - [`Layout::extend`]
2760 - [Added the `cargo tree` command which will print a tree graph of
2761 your dependencies.][cargo/8062] E.g.
2763 mdbook v0.3.2 (/Users/src/rust/mdbook)
2765 │ ├── html5ever v0.24.0
2767 │ │ │ └── cfg-if v0.1.9
2769 │ │ └── markup5ever v0.9.0
2770 │ │ ├── log v0.4.8 (*)
2772 │ │ │ └── phf_shared v0.7.24
2773 │ │ │ ├── siphasher v0.2.3
2774 │ │ │ └── unicase v1.4.2
2775 │ │ │ [build-dependencies]
2776 │ │ │ └── version_check v0.1.5
2779 You can also display dependencies on multiple versions of the same crate with
2780 `cargo tree -d` (short for `cargo tree --duplicates`).
2784 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2785 the version in the sidebar.][69494]
2789 - [Rustc now correctly generates static libraries on Windows GNU targets with
2790 the `.a` extension, rather than the previous `.lib`.][70937]
2791 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2792 - [The `file_name` property in JSON output of macro errors now points the actual
2793 source file rather than the previous format of `<NAME macros>`.][70969]
2794 **Note:** this may not point to a file that actually exists on the user's system.
2795 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2796 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2797 not allow zero initialization such as `NonZeroU8`.][66059] This was
2798 previously a warning.
2799 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2800 operator has been defined as a saturating operation.][71269] This was previously
2801 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2802 continue using the current behaviour, which may be desirable in rare performance
2803 sensitive situations.
2807 These changes provide no direct user facing benefits, but represent significant
2808 improvements to the internals and overall performance of rustc and
2811 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2812 - [Replace big JS dict with JSON parsing.][71250]
2814 [69373]: https://github.com/rust-lang/rust/pull/69373/
2815 [66059]: https://github.com/rust-lang/rust/pull/66059/
2816 [68191]: https://github.com/rust-lang/rust/pull/68191/
2817 [68899]: https://github.com/rust-lang/rust/pull/68899/
2818 [71147]: https://github.com/rust-lang/rust/pull/71147/
2819 [71250]: https://github.com/rust-lang/rust/pull/71250/
2820 [70937]: https://github.com/rust-lang/rust/pull/70937/
2821 [70969]: https://github.com/rust-lang/rust/pull/70969/
2822 [70632]: https://github.com/rust-lang/rust/pull/70632/
2823 [70281]: https://github.com/rust-lang/rust/pull/70281/
2824 [70345]: https://github.com/rust-lang/rust/pull/70345/
2825 [70048]: https://github.com/rust-lang/rust/pull/70048/
2826 [70081]: https://github.com/rust-lang/rust/pull/70081/
2827 [70156]: https://github.com/rust-lang/rust/pull/70156/
2828 [71269]: https://github.com/rust-lang/rust/pull/71269/
2829 [69838]: https://github.com/rust-lang/rust/pull/69838/
2830 [69929]: https://github.com/rust-lang/rust/pull/69929/
2831 [69661]: https://github.com/rust-lang/rust/pull/69661/
2832 [69778]: https://github.com/rust-lang/rust/pull/69778/
2833 [69494]: https://github.com/rust-lang/rust/pull/69494/
2834 [69403]: https://github.com/rust-lang/rust/pull/69403/
2835 [69033]: https://github.com/rust-lang/rust/pull/69033/
2836 [68692]: https://github.com/rust-lang/rust/pull/68692/
2837 [68334]: https://github.com/rust-lang/rust/pull/68334/
2838 [67502]: https://github.com/rust-lang/rust/pull/67502/
2839 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2840 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2841 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2842 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2843 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2844 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2845 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2846 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2847 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2848 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2849 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2850 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2851 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2854 Version 1.43.1 (2020-05-07)
2855 ===========================
2857 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2858 * [Fixed the stabilization of AVX-512 features.][71473]
2859 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2861 [71430]: https://github.com/rust-lang/rust/pull/71430
2862 [71473]: https://github.com/rust-lang/rust/issues/71473
2863 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2866 Version 1.43.0 (2020-04-23)
2867 ==========================
2871 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2872 the type inferred correctly.][68129]
2873 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2875 **Syntax only changes**
2876 - [Allow `type Foo: Ord` syntactically.][69361]
2877 - [Fuse associated and extern items up to defaultness.][69194]
2878 - [Syntactically allow `self` in all `fn` contexts.][68764]
2879 - [Merge `fn` syntax + cleanup item parsing.][68728]
2880 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2881 For example, you may now write:
2883 macro_rules! mac_trait {
2893 These are still rejected *semantically*, so you will likely receive an error but
2894 these changes can be seen and parsed by macros and
2895 conditional compilation.
2900 - [You can now pass multiple lint flags to rustc to override the previous
2901 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2902 everything in the `unused` lint group except `unused-variables` which
2903 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2904 everything in the `unused` lint group **including** `unused-variables` since
2905 the allow flag is specified before the deny flag (and therefore overridden).
2906 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2907 if they are available on `windows-gnu`.][67429]
2908 - [rustc now buffers errors/warnings printed in JSON.][69227]
2912 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2913 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2914 respectively.][69538] **Note** These conversions are only available when `N`
2916 - [You can now use associated constants on floats and integers directly, rather
2917 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2918 `f32::NAN` with no imports.
2919 - [`u8::is_ascii` is now `const`.][68984]
2920 - [`String` now implements `AsMut<str>`.][68742]
2921 - [Added the `primitive` module to `std` and `core`.][67637] This module
2922 reexports Rust's primitive types. This is mainly useful in macros
2923 where you want avoid these types being shadowed.
2924 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2925 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2929 - [`Once::is_completed`]
2934 - [`iter::once_with`]
2938 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2939 your environment.][cargo/7823]
2940 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2941 executable path when running integration tests or benchmarks.][cargo/7697]
2942 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2943 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2947 - [Certain checks in the `const_err` lint were deemed unrelated to const
2948 evaluation][69185], and have been moved to the `unconditional_panic` and
2949 `arithmetic_overflow` lints.
2954 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2955 has been a warning since 1.36.0.
2956 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2957 led to some instances being accepted, and now correctly emits a hard error.
2959 [69340]: https://github.com/rust-lang/rust/pull/69340
2963 These changes provide no direct user facing benefits, but represent significant
2964 improvements to the internals and overall performance of `rustc` and
2967 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2968 - [Improved how rustc generates drop code.][67332]
2969 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2970 - [traits: preallocate 2 Vecs of known initial size][69022]
2971 - [Avoid exponential behaviour when relating types][68772]
2972 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2973 - [Improve performance of coherence checks][68966]
2974 - [Deduplicate types in the generator witness][68672]
2975 - [Invert control in struct_lint_level.][68725]
2977 [67332]: https://github.com/rust-lang/rust/pull/67332/
2978 [67429]: https://github.com/rust-lang/rust/pull/67429/
2979 [67637]: https://github.com/rust-lang/rust/pull/67637/
2980 [67642]: https://github.com/rust-lang/rust/pull/67642/
2981 [67878]: https://github.com/rust-lang/rust/pull/67878/
2982 [67885]: https://github.com/rust-lang/rust/pull/67885/
2983 [68129]: https://github.com/rust-lang/rust/pull/68129/
2984 [68672]: https://github.com/rust-lang/rust/pull/68672/
2985 [68725]: https://github.com/rust-lang/rust/pull/68725/
2986 [68728]: https://github.com/rust-lang/rust/pull/68728/
2987 [68738]: https://github.com/rust-lang/rust/pull/68738/
2988 [68742]: https://github.com/rust-lang/rust/pull/68742/
2989 [68764]: https://github.com/rust-lang/rust/pull/68764/
2990 [68772]: https://github.com/rust-lang/rust/pull/68772/
2991 [68943]: https://github.com/rust-lang/rust/pull/68943/
2992 [68952]: https://github.com/rust-lang/rust/pull/68952/
2993 [68966]: https://github.com/rust-lang/rust/pull/68966/
2994 [68984]: https://github.com/rust-lang/rust/pull/68984/
2995 [69022]: https://github.com/rust-lang/rust/pull/69022/
2996 [69185]: https://github.com/rust-lang/rust/pull/69185/
2997 [69194]: https://github.com/rust-lang/rust/pull/69194/
2998 [69201]: https://github.com/rust-lang/rust/pull/69201/
2999 [69227]: https://github.com/rust-lang/rust/pull/69227/
3000 [69548]: https://github.com/rust-lang/rust/pull/69548/
3001 [69256]: https://github.com/rust-lang/rust/pull/69256/
3002 [69361]: https://github.com/rust-lang/rust/pull/69361/
3003 [69366]: https://github.com/rust-lang/rust/pull/69366/
3004 [69538]: https://github.com/rust-lang/rust/pull/69538/
3005 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
3006 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
3007 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
3008 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
3009 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
3010 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
3011 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
3012 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
3015 Version 1.42.0 (2020-03-12)
3016 ==========================
3020 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
3022 fn foo(words: &[&str]) {
3024 ["Hello", "World", "!", ..] => println!("Hello World!"),
3025 ["Foo", "Bar", ..] => println!("Baz"),
3026 rest => println!("{:?}", rest),
3030 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
3031 that you can create an enum that has the exact layout and ABI of the type
3033 - [You can now use outer attribute procedural macros on inline modules.][64273]
3034 - [There are some *syntax-only* changes:][67131]
3035 - `default` is syntactically allowed before items in `trait` definitions.
3036 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
3037 leave out their bodies in favor of `;`.
3038 - Bounds on associated types in `impl`s are now syntactically allowed
3039 (e.g. `type Foo: Ord;`).
3040 - `...` (the C-variadic type) may occur syntactically directly as the type of
3041 any function parameter.
3043 These are still rejected *semantically*, so you will likely receive an error
3044 but these changes can be seen and parsed by procedural macros and
3045 conditional compilation.
3049 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
3050 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
3051 - [`Option::{expect,unwrap}` and
3052 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
3053 pointing to the location where they were called, rather than
3054 `core`'s internals. ][67887]
3056 \* Refer to Rust's [platform support page][platform-support-doc] for more
3057 information on Rust's tiered platform support.
3061 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
3062 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
3063 to implement `Sized`.][67935]
3064 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
3065 - [`Layout::new` is now `const`.][66254]
3066 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
3071 - [`CondVar::wait_while`]
3072 - [`CondVar::wait_timeout_while`]
3074 - [`DebugMap::value`]
3075 - [`ManuallyDrop::take`]
3077 - [`ptr::slice_from_raw_parts_mut`]
3078 - [`ptr::slice_from_raw_parts`]
3082 - [You no longer need to include `extern crate proc_macro;` to be able to
3083 `use proc_macro;` in the `2018` edition.][cargo/7700]
3087 - [`Error::description` has been deprecated, and its use will now produce a
3088 warning.][66919] It's recommended to use `Display`/`to_string` instead.
3090 [68253]: https://github.com/rust-lang/rust/pull/68253/
3091 [68348]: https://github.com/rust-lang/rust/pull/68348/
3092 [67935]: https://github.com/rust-lang/rust/pull/67935/
3093 [68339]: https://github.com/rust-lang/rust/pull/68339/
3094 [68122]: https://github.com/rust-lang/rust/pull/68122/
3095 [64273]: https://github.com/rust-lang/rust/pull/64273/
3096 [67712]: https://github.com/rust-lang/rust/pull/67712/
3097 [67887]: https://github.com/rust-lang/rust/pull/67887/
3098 [67131]: https://github.com/rust-lang/rust/pull/67131/
3099 [67233]: https://github.com/rust-lang/rust/pull/67233/
3100 [66899]: https://github.com/rust-lang/rust/pull/66899/
3101 [66919]: https://github.com/rust-lang/rust/pull/66919/
3102 [66254]: https://github.com/rust-lang/rust/pull/66254/
3103 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
3104 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
3105 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
3106 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
3107 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
3108 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
3109 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
3110 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
3111 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
3114 Version 1.41.1 (2020-02-27)
3115 ===========================
3117 * [Always check types of static items][69145]
3118 * [Always check lifetime bounds of `Copy` impls][69145]
3119 * [Fix miscompilation in callers of `Layout::repeat`][69225]
3121 [69225]: https://github.com/rust-lang/rust/issues/69225
3122 [69145]: https://github.com/rust-lang/rust/pull/69145
3125 Version 1.41.0 (2020-01-30)
3126 ===========================
3131 - [You can now pass type parameters to foreign items when implementing
3132 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
3133 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
3134 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
3135 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
3136 - [You can now use any valid identifier in a `format_args` macro.][66847]
3137 Previously identifiers starting with an underscore were not allowed.
3138 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
3139 enum variants.][66183] These are still rejected semantically, but
3140 can be seen and parsed by procedural macros and conditional compilation.
3141 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
3142 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
3143 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
3145 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
3150 - [Rustc will now warn if you have unused loop `'label`s.][66325]
3151 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
3152 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
3153 - [You can now pass an arguments file passing the `@path` syntax
3154 to rustc.][66172] Note that the format differs somewhat from what is
3155 found in other tooling; please see [the documentation][argfile-docs] for
3157 - [You can now provide `--extern` flag without a path, indicating that it is
3158 available from the search path or specified with an `-L` flag.][64882]
3160 \* Refer to Rust's [platform support page][platform-support-doc] for more
3161 information on Rust's tiered platform support.
3163 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
3168 - [The `core::panic` module is now stable.][66771] It was already stable
3170 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
3171 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
3172 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
3177 - [`Result::map_or`]
3178 - [`Result::map_or_else`]
3179 - [`std::rc::Weak::weak_count`]
3180 - [`std::rc::Weak::strong_count`]
3181 - [`std::sync::Weak::weak_count`]
3182 - [`std::sync::Weak::strong_count`]
3187 - [Cargo will now document all the private items for binary crates
3188 by default.][cargo/7593]
3189 - [`cargo-install` will now reinstall the package if it detects that it is out
3190 of date.][cargo/7560]
3191 - [Cargo.lock now uses a more git friendly format that should help to reduce
3192 merge conflicts.][cargo/7579]
3193 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
3194 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
3195 optimisation level to `2` for debug builds. You can also use
3196 `[profile.<profile>.build-override]` to override build scripts and
3202 - [You can now specify `edition` in documentation code blocks to compile the block
3203 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
3204 should be compiled the 2018 edition of Rust.
3205 - [You can now provide custom themes to rustdoc with `--theme`, and check the
3206 current theme with `--check-theme`.][54733]
3207 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
3212 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
3213 Apple targets.][apple-32bit-drop] This means that the source code is still
3214 available to build, but the targets are no longer being tested and release
3215 binaries for those platforms will no longer be distributed by the Rust project.
3216 Please refer to the linked blog post for more information.
3218 [54733]: https://github.com/rust-lang/rust/pull/54733/
3219 [61351]: https://github.com/rust-lang/rust/pull/61351/
3220 [62514]: https://github.com/rust-lang/rust/pull/62514/
3221 [67255]: https://github.com/rust-lang/rust/pull/67255/
3222 [66661]: https://github.com/rust-lang/rust/pull/66661/
3223 [66771]: https://github.com/rust-lang/rust/pull/66771/
3224 [66847]: https://github.com/rust-lang/rust/pull/66847/
3225 [66238]: https://github.com/rust-lang/rust/pull/66238/
3226 [66277]: https://github.com/rust-lang/rust/pull/66277/
3227 [66325]: https://github.com/rust-lang/rust/pull/66325/
3228 [66172]: https://github.com/rust-lang/rust/pull/66172/
3229 [66183]: https://github.com/rust-lang/rust/pull/66183/
3230 [65879]: https://github.com/rust-lang/rust/pull/65879/
3231 [65013]: https://github.com/rust-lang/rust/pull/65013/
3232 [64882]: https://github.com/rust-lang/rust/pull/64882/
3233 [64325]: https://github.com/rust-lang/rust/pull/64325/
3234 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
3235 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
3236 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
3237 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
3238 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
3239 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
3240 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
3241 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
3242 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
3243 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
3244 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
3246 Version 1.40.0 (2019-12-19)
3247 ===========================
3251 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
3252 `const` contexts.][65188] e.g.
3255 pub struct Point(i32, i32);
3257 const ORIGIN: Point = {
3258 let constructor = Point;
3264 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
3265 indicate that there may be variants or fields added in the future.][64639]
3266 For example this requires adding a wild-card branch (`_ => {}`) to any match
3267 statements on a non-exhaustive `enum`. [(RFC 2008)]
3268 - [You can now use function-like procedural macros in `extern` blocks and in
3269 type positions.][63931] e.g. `type Generated = macro!();`
3270 - [Function-like and attribute procedural macros can now emit
3271 `macro_rules!` items, so you can now have your macros generate macros.][64035]
3272 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
3273 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
3274 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
3278 - [Added tier 3 support\* for the
3279 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
3280 - [Added tier 3 support for the
3281 `aarch64-unknown-none-softfloat` target.][64589]
3282 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
3283 `mips64el-unknown-linux-muslabi64` targets.][65843]
3285 \* Refer to Rust's [platform support page][platform-support-doc] for more
3286 information on Rust's tiered platform support.
3290 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
3294 - [`BTreeMap::get_key_value`]
3295 - [`HashMap::get_key_value`]
3296 - [`Option::as_deref_mut`]
3297 - [`Option::as_deref`]
3298 - [`Option::flatten`]
3299 - [`UdpSocket::peer_addr`]
3300 - [`f32::to_be_bytes`]
3301 - [`f32::to_le_bytes`]
3302 - [`f32::to_ne_bytes`]
3303 - [`f64::to_be_bytes`]
3304 - [`f64::to_le_bytes`]
3305 - [`f64::to_ne_bytes`]
3306 - [`f32::from_be_bytes`]
3307 - [`f32::from_le_bytes`]
3308 - [`f32::from_ne_bytes`]
3309 - [`f64::from_be_bytes`]
3310 - [`f64::from_le_bytes`]
3311 - [`f64::from_ne_bytes`]
3318 - [Cargo will now always display warnings, rather than only on
3319 fresh builds.][cargo/7450]
3320 - [Feature flags (except `--all-features`) passed to a virtual workspace will
3321 now produce an error.][cargo/7507] Previously these flags were ignored.
3322 - [You can now publish `dev-dependencies` without including
3323 a `version`.][cargo/7333]
3327 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
3328 when running documentation tests with `rustdoc`.][63803]
3332 - [As previously announced, any previous NLL warnings in the 2015 edition are
3333 now hard errors.][64221]
3334 - [The `include!` macro will now warn if it failed to include the
3335 entire file.][64284] The `include!` macro unintentionally only includes the
3336 first _expression_ in a file, and this can be unintuitive. This will become
3337 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
3338 - [Using `#[inline]` on function prototypes and consts now emits a warning under
3339 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
3340 or `extern` blocks now correctly emits a hard error.
3342 [65294]: https://github.com/rust-lang/rust/pull/65294/
3343 [66103]: https://github.com/rust-lang/rust/pull/66103/
3344 [65843]: https://github.com/rust-lang/rust/pull/65843/
3345 [65188]: https://github.com/rust-lang/rust/pull/65188/
3346 [65092]: https://github.com/rust-lang/rust/pull/65092/
3347 [64589]: https://github.com/rust-lang/rust/pull/64589/
3348 [64639]: https://github.com/rust-lang/rust/pull/64639/
3349 [64221]: https://github.com/rust-lang/rust/pull/64221/
3350 [64284]: https://github.com/rust-lang/rust/pull/64284/
3351 [63931]: https://github.com/rust-lang/rust/pull/63931/
3352 [64035]: https://github.com/rust-lang/rust/pull/64035/
3353 [63674]: https://github.com/rust-lang/rust/pull/63674/
3354 [63803]: https://github.com/rust-lang/rust/pull/63803/
3355 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
3356 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
3357 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
3358 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
3359 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
3360 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
3361 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
3362 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
3363 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
3364 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
3365 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
3366 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
3367 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
3368 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
3369 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
3370 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
3371 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
3372 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
3373 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
3374 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
3375 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
3376 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
3377 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
3378 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
3379 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
3382 Version 1.39.0 (2019-11-07)
3383 ===========================
3387 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
3388 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
3389 - [You can now use certain attributes on function, closure, and function pointer
3390 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
3391 `deny`, `forbid` as well as inert helper attributes used by procedural macro
3392 attributes applied to items. e.g.
3395 #[cfg(windows)] slice: &[u16],
3396 #[cfg(not(windows))] slice: &[u8],
3401 - [You can now take shared references to bind-by-move patterns in the `if` guards
3402 of `match` arms.][63118] e.g.
3405 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
3409 // ---- `nums` is bound by move.
3410 if nums.iter().sum::<u8>() == 10
3411 // ^------ `.iter()` implicitly takes a reference to `nums`.
3414 // ----------- Legal as `nums` was bound by move and so we have ownership.
3416 _ => unreachable!(),
3425 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3426 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3427 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3428 **Note** Cargo currently doesn't use this feature. Refer to
3429 [cargo#7315][cargo/7315] to track this feature's progress.
3430 - [You can now pass `--show-output` argument to test binaries to print the
3431 output of successful tests.][62600]
3434 \* Refer to Rust's [platform support page][platform-support-doc] for more
3435 information on Rust's tiered platform support.
3439 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3440 - [`LinkedList::new` is now a `const` function.][63684]
3441 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3442 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3443 now `const`.][63786]
3447 - [`Pin::into_inner`]
3448 - [`Instant::checked_duration_since`]
3449 - [`Instant::saturating_duration_since`]
3453 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3454 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3455 `--all` is now deprecated.
3459 - [You can now pass `-Clinker` to rustdoc to control the linker used
3460 for compiling doctests.][63834]
3464 - [Code that was previously accepted by the old borrow checker, but rejected by
3465 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3466 previously a warning, and will also become a hard error in the Rust 2015
3467 edition in the 1.40.0 release.
3468 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3469 run tests.][63827] This should improve performance when running a large
3471 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3472 recommended to use the `?` operator instead.
3473 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3476 [62600]: https://github.com/rust-lang/rust/pull/62600/
3477 [62672]: https://github.com/rust-lang/rust/pull/62672/
3478 [63118]: https://github.com/rust-lang/rust/pull/63118/
3479 [63209]: https://github.com/rust-lang/rust/pull/63209/
3480 [63402]: https://github.com/rust-lang/rust/pull/63402/
3481 [63565]: https://github.com/rust-lang/rust/pull/63565/
3482 [63595]: https://github.com/rust-lang/rust/pull/63595/
3483 [63684]: https://github.com/rust-lang/rust/pull/63684/
3484 [63698]: https://github.com/rust-lang/rust/pull/63698/
3485 [63770]: https://github.com/rust-lang/rust/pull/63770/
3486 [63786]: https://github.com/rust-lang/rust/pull/63786/
3487 [63827]: https://github.com/rust-lang/rust/pull/63827/
3488 [63834]: https://github.com/rust-lang/rust/pull/63834/
3489 [64010]: https://github.com/rust-lang/rust/pull/64010/
3490 [64028]: https://github.com/rust-lang/rust/pull/64028/
3491 [64334]: https://github.com/rust-lang/rust/pull/64334/
3492 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3493 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3494 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3495 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3496 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3497 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3499 Version 1.38.0 (2019-09-26)
3500 ==========================
3504 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3505 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3509 - [Added pipelined compilation support to `rustc`.][62766] This will
3510 improve compilation times in some cases. For further information please refer
3511 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3512 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3513 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3514 `x86_64-uwp-windows-msvc` targets.][60260]
3515 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3516 `armv7-unknown-linux-musleabi` targets.][63107]
3517 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3518 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3519 - [Upgraded to LLVM 9.][62592]
3521 \* Refer to Rust's [platform support page][platform-support-doc] for more
3522 information on Rust's tiered platform support.
3526 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3527 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3528 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3529 is available at `std::clone::Clone`). This also makes all built-in macros
3530 available in `std`/`core` root. e.g. `std::include_bytes!`.
3531 - [`str::Chars` now implements `Debug`.][63000]
3532 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3533 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3534 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3535 - [Added euclidean remainder and division operations (`div_euclid`,
3536 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3537 `overflowing`, and `wrapping` versions are available for all
3539 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3540 `PartialEq`.][61491]
3541 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3545 - [`<*const T>::cast`]
3546 - [`<*mut T>::cast`]
3547 - [`Duration::as_secs_f32`]
3548 - [`Duration::as_secs_f64`]
3549 - [`Duration::div_f32`]
3550 - [`Duration::div_f64`]
3551 - [`Duration::from_secs_f32`]
3552 - [`Duration::from_secs_f64`]
3553 - [`Duration::mul_f32`]
3554 - [`Duration::mul_f64`]
3555 - [`any::type_name`]
3559 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3560 - [You can now pass the `--features` option multiple times to enable
3561 multiple features.][cargo/7084]
3566 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3570 - [`rustc` will now warn about some incorrect uses of
3571 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3575 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3577 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3578 issues][62896] with certain crates such as libc.
3580 [60260]: https://github.com/rust-lang/rust/pull/60260/
3581 [61457]: https://github.com/rust-lang/rust/pull/61457/
3582 [61491]: https://github.com/rust-lang/rust/pull/61491/
3583 [61884]: https://github.com/rust-lang/rust/pull/61884/
3584 [61953]: https://github.com/rust-lang/rust/pull/61953/
3585 [62042]: https://github.com/rust-lang/rust/pull/62042/
3586 [62528]: https://github.com/rust-lang/rust/pull/62528/
3587 [62583]: https://github.com/rust-lang/rust/pull/62583/
3588 [62735]: https://github.com/rust-lang/rust/pull/62735/
3589 [62766]: https://github.com/rust-lang/rust/pull/62766/
3590 [62784]: https://github.com/rust-lang/rust/pull/62784/
3591 [62592]: https://github.com/rust-lang/rust/pull/62592/
3592 [62785]: https://github.com/rust-lang/rust/issues/62785/
3593 [62814]: https://github.com/rust-lang/rust/pull/62814/
3594 [62896]: https://github.com/rust-lang/rust/issues/62896/
3595 [63000]: https://github.com/rust-lang/rust/pull/63000/
3596 [63056]: https://github.com/rust-lang/rust/pull/63056/
3597 [63107]: https://github.com/rust-lang/rust/pull/63107/
3598 [63346]: https://github.com/rust-lang/rust/pull/63346/
3599 [63421]: https://github.com/rust-lang/rust/pull/63421/
3600 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3601 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3602 [63048]: https://github.com/rust-lang/rust/pull/63048
3603 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3604 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3605 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3606 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3607 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3608 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3609 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3610 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3611 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3612 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3613 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3614 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3615 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3617 Version 1.37.0 (2019-08-15)
3618 ==========================
3622 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3623 [`Box`][62228], or an [array][62235] and unused.
3624 - [You can now use the `cfg` and `cfg_attr` attributes on
3625 generic parameters.][61547]
3626 - [You can now use enum variants through type alias.][61682] e.g. You can
3627 write the following:
3629 type MyOption = Option<u8>;
3631 fn increment_or_zero(x: MyOption) -> u8 {
3633 MyOption::Some(y) => y + 1,
3634 MyOption::None => 0,
3638 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3639 `const _: u32 = 5;`.
3640 - [You can now use `#[repr(align(X)]` on enums.][61229]
3641 - [The `?` Kleene macro operator is now available in the
3642 2015 edition.][60932]
3646 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3647 and `-C profile-use` flags.][61268] For more information on how to use profile
3648 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3649 - [The `rust-lldb` wrapper script should now work again.][61827]
3653 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3657 - [`BufReader::buffer`]
3658 - [`BufWriter::buffer`]
3659 - [`Cell::from_mut`]
3660 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3661 - [`DoubleEndedIterator::nth_back`]
3663 - [`Wrapping::reverse_bits`]
3664 - [`i128::reverse_bits`]
3665 - [`i16::reverse_bits`]
3666 - [`i32::reverse_bits`]
3667 - [`i64::reverse_bits`]
3668 - [`i8::reverse_bits`]
3669 - [`isize::reverse_bits`]
3670 - [`slice::copy_within`]
3671 - [`u128::reverse_bits`]
3672 - [`u16::reverse_bits`]
3673 - [`u32::reverse_bits`]
3674 - [`u64::reverse_bits`]
3675 - [`u8::reverse_bits`]
3676 - [`usize::reverse_bits`]
3680 - [`Cargo.lock` files are now included by default when publishing executable crates
3681 with executables.][cargo/7026]
3682 - [You can now specify `default-run="foo"` in `[package]` to specify the
3683 default executable to use for `cargo run`.][cargo/7056]
3690 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3691 Please transition your code to using the `..=` syntax for inclusive
3693 - [Using a trait object without the `dyn` will now warn by default.][61203]
3694 Please transition your code to use `dyn Trait` for trait objects instead.
3696 [62228]: https://github.com/rust-lang/rust/pull/62228/
3697 [62235]: https://github.com/rust-lang/rust/pull/62235/
3698 [61802]: https://github.com/rust-lang/rust/pull/61802/
3699 [61827]: https://github.com/rust-lang/rust/pull/61827/
3700 [61547]: https://github.com/rust-lang/rust/pull/61547/
3701 [61682]: https://github.com/rust-lang/rust/pull/61682/
3702 [61268]: https://github.com/rust-lang/rust/pull/61268/
3703 [61342]: https://github.com/rust-lang/rust/pull/61342/
3704 [61347]: https://github.com/rust-lang/rust/pull/61347/
3705 [61100]: https://github.com/rust-lang/rust/pull/61100/
3706 [61203]: https://github.com/rust-lang/rust/pull/61203/
3707 [61229]: https://github.com/rust-lang/rust/pull/61229/
3708 [60932]: https://github.com/rust-lang/rust/pull/60932/
3709 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3710 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3711 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3712 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3713 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3714 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3715 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3716 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3717 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3718 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3719 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3720 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3721 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3722 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3723 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3724 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3725 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3726 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3727 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3728 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3729 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3730 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3731 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3734 Version 1.36.0 (2019-07-04)
3735 ==========================
3739 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3740 - [The order of traits in trait objects no longer affects the semantics of that
3741 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3742 `dyn fmt::Debug + Send`, where this was previously not the case.
3746 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3747 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3748 - [`mem::needs_drop` is now available as a const fn.][60364]
3749 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3750 - [`String` now implements `BorrowMut<str>`.][60404]
3751 - [`io::Cursor` now implements `Default`.][60234]
3752 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3753 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3754 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3755 environment has access to heap memory allocation.
3756 - [`String` now implements `From<&String>`.][59825]
3757 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3758 return a tuple of each argument when there is multiple arguments.
3759 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3764 - [`VecDeque::rotate_left`]
3765 - [`VecDeque::rotate_right`]
3766 - [`Iterator::copied`]
3768 - [`io::IoSliceMut`]
3769 - [`Read::read_vectored`]
3770 - [`Write::write_vectored`]
3771 - [`str::as_mut_ptr`]
3772 - [`mem::MaybeUninit`]
3773 - [`pointer::align_offset`]
3774 - [`future::Future`]
3776 - [`task::RawWaker`]
3777 - [`task::RawWakerVTable`]
3783 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3784 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3786 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3790 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3797 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3798 longer recommended, and will be deprecated in 1.39.0.
3800 [60318]: https://github.com/rust-lang/rust/pull/60318/
3801 [60364]: https://github.com/rust-lang/rust/pull/60364/
3802 [60370]: https://github.com/rust-lang/rust/pull/60370/
3803 [60404]: https://github.com/rust-lang/rust/pull/60404/
3804 [60234]: https://github.com/rust-lang/rust/pull/60234/
3805 [60244]: https://github.com/rust-lang/rust/pull/60244/
3806 [58623]: https://github.com/rust-lang/rust/pull/58623/
3807 [59648]: https://github.com/rust-lang/rust/pull/59648/
3808 [59675]: https://github.com/rust-lang/rust/pull/59675/
3809 [59825]: https://github.com/rust-lang/rust/pull/59825/
3810 [59826]: https://github.com/rust-lang/rust/pull/59826/
3811 [59445]: https://github.com/rust-lang/rust/pull/59445/
3812 [59114]: https://github.com/rust-lang/rust/pull/59114/
3813 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3814 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3815 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3816 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3817 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3818 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3819 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3820 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3821 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3822 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3823 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3824 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3825 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3826 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3827 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3828 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3829 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3830 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3831 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3832 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3835 Version 1.35.0 (2019-05-23)
3836 ==========================
3840 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3841 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3842 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3844 unsafe fn call_unsafe(func: unsafe fn()) {
3849 unsafe { call_unsafe(|| {}); }
3856 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3857 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3858 - [Added the `wasm32-unknown-wasi` target.][59464]
3863 - [`Thread` will now show its ID in `Debug` output.][59460]
3864 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3865 - [`alloc::System` now implements `Default`.][59451]
3866 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3868 - [`char::{ToLowercase, ToUppercase}` now
3869 implement `ExactSizeIterator`.][58778]
3870 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3871 - [Removed the `Read` trait bounds
3872 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3873 - [You can now call the `dbg!` macro without any parameters to print the file
3874 and line where it is called.][57847]
3875 - [In place ASCII case conversions are now up to 4× faster.][59283]
3876 e.g. `str::make_ascii_lowercase`
3877 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3884 - [`RefCell::replace_with`]
3885 - [`RefCell::map_split`]
3887 - [`Range::contains`]
3888 - [`RangeFrom::contains`]
3889 - [`RangeTo::contains`]
3890 - [`RangeInclusive::contains`]
3891 - [`RangeToInclusive::contains`]
3892 - [`Option::copied`]
3896 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3897 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3902 - [The Rust toolchain is now available natively for musl based distros.][58575]
3904 [59460]: https://github.com/rust-lang/rust/pull/59460/
3905 [59464]: https://github.com/rust-lang/rust/pull/59464/
3906 [59500]: https://github.com/rust-lang/rust/pull/59500/
3907 [59512]: https://github.com/rust-lang/rust/pull/59512/
3908 [59580]: https://github.com/rust-lang/rust/pull/59580/
3909 [59283]: https://github.com/rust-lang/rust/pull/59283/
3910 [59451]: https://github.com/rust-lang/rust/pull/59451/
3911 [59076]: https://github.com/rust-lang/rust/pull/59076/
3912 [58778]: https://github.com/rust-lang/rust/pull/58778/
3913 [58717]: https://github.com/rust-lang/rust/pull/58717/
3914 [58369]: https://github.com/rust-lang/rust/pull/58369/
3915 [58423]: https://github.com/rust-lang/rust/pull/58423/
3916 [58080]: https://github.com/rust-lang/rust/pull/58080/
3917 [57847]: https://github.com/rust-lang/rust/pull/57847/
3918 [58575]: https://github.com/rust-lang/rust/pull/58575
3919 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3920 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3921 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3922 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3923 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3924 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3925 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3926 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3927 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3928 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3929 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3930 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3932 Version 1.34.2 (2019-05-14)
3933 ===========================
3935 * [Destabilize the `Error::type_id` function due to a security
3936 vulnerability][60785] ([CVE-2019-12083])
3938 [60785]: https://github.com/rust-lang/rust/pull/60785
3939 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3941 Version 1.34.1 (2019-04-25)
3942 ===========================
3944 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3945 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3946 * [Fix Clippy panic when checking some macros][clippy/3805]
3948 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3949 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3950 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3952 Version 1.34.0 (2019-04-11)
3953 ==========================
3957 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3958 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3960 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3961 `#[attr{}]` procedural macros.][57367]
3962 - [You can now write `extern crate self as foo;`][57407] to import your
3963 crate's root into the extern prelude.
3968 - [You can now target `riscv64imac-unknown-none-elf` and
3969 `riscv64gc-unknown-none-elf`.][58406]
3970 - [You can now enable linker plugin LTO optimisations with
3971 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3972 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3974 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3979 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3980 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3981 the `Hash` trait to create an iterator.
3982 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3983 methods.][58421] Most notably you no longer require the `Ord` trait to create
3985 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3986 for all numeric types.][58044]
3987 - [Indexing a `str` is now generic over all types that
3988 implement `SliceIndex<str>`.][57604]
3989 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3990 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3991 produce a warning if their returning type is unused.
3992 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3993 `overflowing_pow` are now available for all numeric types.][57873] These are
3994 equivalent to methods such as `wrapping_add` for the `pow` operation.
4002 * [`Error::type_id`]
4003 * [`atomic::AtomicI16`]
4004 * [`atomic::AtomicI32`]
4005 * [`atomic::AtomicI64`]
4006 * [`atomic::AtomicI8`]
4007 * [`atomic::AtomicU16`]
4008 * [`atomic::AtomicU32`]
4009 * [`atomic::AtomicU64`]
4010 * [`atomic::AtomicU8`]
4011 * [`convert::Infallible`]
4012 * [`convert::TryFrom`]
4013 * [`convert::TryInto`]
4015 * [`iter::successors`]
4016 * [`num::NonZeroI128`]
4017 * [`num::NonZeroI16`]
4018 * [`num::NonZeroI32`]
4019 * [`num::NonZeroI64`]
4020 * [`num::NonZeroI8`]
4021 * [`num::NonZeroIsize`]
4022 * [`slice::sort_by_cached_key`]
4023 * [`str::escape_debug`]
4024 * [`str::escape_default`]
4025 * [`str::escape_unicode`]
4026 * [`str::split_ascii_whitespace`]
4029 * [`Instant::checked_add`]
4030 * [`Instant::checked_sub`]
4031 * [`SystemTime::checked_add`]
4032 * [`SystemTime::checked_sub`]
4036 - [You can now use alternative registries to crates.io.][cargo/6654]
4040 - [You can now use the `?` operator in your documentation tests without manually
4041 adding `fn main() -> Result<(), _> {}`.][56470]
4045 - [`Command::before_exec` is being replaced by the unsafe method
4046 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
4047 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
4048 can now use `const` functions in `static` variables.
4050 [58370]: https://github.com/rust-lang/rust/pull/58370/
4051 [58406]: https://github.com/rust-lang/rust/pull/58406/
4052 [58421]: https://github.com/rust-lang/rust/pull/58421/
4053 [58166]: https://github.com/rust-lang/rust/pull/58166/
4054 [58044]: https://github.com/rust-lang/rust/pull/58044/
4055 [58057]: https://github.com/rust-lang/rust/pull/58057/
4056 [58059]: https://github.com/rust-lang/rust/pull/58059/
4057 [57809]: https://github.com/rust-lang/rust/pull/57809/
4058 [57873]: https://github.com/rust-lang/rust/pull/57873/
4059 [57604]: https://github.com/rust-lang/rust/pull/57604/
4060 [57367]: https://github.com/rust-lang/rust/pull/57367/
4061 [57407]: https://github.com/rust-lang/rust/pull/57407/
4062 [57425]: https://github.com/rust-lang/rust/pull/57425/
4063 [57106]: https://github.com/rust-lang/rust/pull/57106/
4064 [56470]: https://github.com/rust-lang/rust/pull/56470/
4065 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
4066 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
4067 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
4068 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
4069 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
4070 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
4071 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
4072 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
4073 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
4074 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
4075 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
4076 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
4077 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
4078 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
4079 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
4080 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
4081 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
4082 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
4083 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
4084 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
4085 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
4086 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
4087 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
4088 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
4089 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
4090 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
4091 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
4092 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
4093 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
4094 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
4095 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
4098 Version 1.33.0 (2019-02-28)
4099 ==========================
4103 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
4104 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
4105 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
4106 E.g. You can have match statement on a `u8` that covers `0..=255` and
4107 you would no longer be required to have a `_ => unreachable!()` case.
4108 - [You can now have multiple patterns in `if let` and `while let`
4109 expressions.][57532] You can do this with the same syntax as a `match`
4119 let state = Creature::Crab("Ferris");
4121 if let Creature::Crab(name) | Creature::Person(name) = state {
4122 println!("This creature's name is: {}", name);
4126 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
4127 this feature will by default produce a warning as this behaviour can be
4128 unintuitive. E.g. `if let _ = 5 {}`
4129 - [You can now use `let` bindings, assignments, expression statements,
4130 and irrefutable pattern destructuring in const functions.][57175]
4131 - [You can now call unsafe const functions.][57067] E.g.
4133 const unsafe fn foo() -> i32 { 5 }
4134 const fn bar() -> i32 {
4138 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
4139 E.g. `#[cfg_attr(all(), must_use, optimize)]`
4140 - [You can now specify a specific alignment with the `#[repr(packed)]`
4141 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
4142 with an alignment of 2 bytes and a size of 6 bytes.
4143 - [You can now import an item from a module as an `_`.][56303] This allows you to
4144 import a trait's impls, and not have the name in the namespace. E.g.
4146 use std::io::Read as _;
4148 // Allowed as there is only one `Read` in the module.
4151 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
4155 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
4156 command line argument.][56351]
4157 - [The minimum required LLVM version has been bumped to 6.0.][56642]
4158 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
4159 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
4160 tier 2 support.][57130] Visit the [platform support][platform-support] page for
4161 information on Rust's platform support.
4162 - [Added support for the `thumbv7neon-linux-androideabi` and
4163 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
4164 - [Added support for the `x86_64-unknown-uefi` target.][56769]
4168 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
4169 functions for all numeric types.][57566]
4170 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
4171 are now `const` functions for all numeric types.][57105]
4172 - [The methods `is_positive` and `is_negative` are now `const` functions for
4173 all signed numeric types.][57105]
4174 - [The `get` method for all `NonZero` types is now `const`.][57167]
4175 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
4176 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
4177 numeric types.][57234]
4178 - [`Ipv4Addr::new` is now a `const` function][57234]
4182 - [`unix::FileExt::read_exact_at`]
4183 - [`unix::FileExt::write_all_at`]
4184 - [`Option::transpose`]
4185 - [`Result::transpose`]
4186 - [`convert::identity`]
4189 - [`marker::PhantomPinned`]
4190 - [`Vec::resize_with`]
4191 - [`VecDeque::resize_with`]
4192 - [`Duration::as_millis`]
4193 - [`Duration::as_micros`]
4194 - [`Duration::as_nanos`]
4199 - [You can now publish crates that require a feature flag to compile with
4200 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
4201 - [Cargo should now rebuild a crate if a file was modified during the initial
4206 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
4207 are now deprecated in the standard library, and their usage will now produce a warning.
4208 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
4210 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
4212 - [Libtest no longer creates a new thread for each test when
4213 `--test-threads=1`. It also runs the tests in deterministic order][56243]
4215 [56243]: https://github.com/rust-lang/rust/pull/56243
4216 [56303]: https://github.com/rust-lang/rust/pull/56303/
4217 [56351]: https://github.com/rust-lang/rust/pull/56351/
4218 [56362]: https://github.com/rust-lang/rust/pull/56362
4219 [56642]: https://github.com/rust-lang/rust/pull/56642/
4220 [56769]: https://github.com/rust-lang/rust/pull/56769/
4221 [56805]: https://github.com/rust-lang/rust/pull/56805
4222 [56947]: https://github.com/rust-lang/rust/pull/56947/
4223 [57049]: https://github.com/rust-lang/rust/pull/57049/
4224 [57067]: https://github.com/rust-lang/rust/pull/57067/
4225 [57105]: https://github.com/rust-lang/rust/pull/57105
4226 [57130]: https://github.com/rust-lang/rust/pull/57130/
4227 [57167]: https://github.com/rust-lang/rust/pull/57167/
4228 [57175]: https://github.com/rust-lang/rust/pull/57175/
4229 [57234]: https://github.com/rust-lang/rust/pull/57234/
4230 [57332]: https://github.com/rust-lang/rust/pull/57332/
4231 [57465]: https://github.com/rust-lang/rust/pull/57465/
4232 [57532]: https://github.com/rust-lang/rust/pull/57532/
4233 [57535]: https://github.com/rust-lang/rust/pull/57535/
4234 [57566]: https://github.com/rust-lang/rust/pull/57566/
4235 [57615]: https://github.com/rust-lang/rust/pull/57615/
4236 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
4237 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
4238 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
4239 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
4240 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
4241 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
4242 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
4243 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
4244 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
4245 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
4246 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
4247 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
4248 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
4249 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
4250 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
4251 [platform-support]: https://forge.rust-lang.org/platform-support.html
4253 Version 1.32.0 (2019-01-17)
4254 ==========================
4259 - [You can now use the `?` operator in macro definitions.][56245] The `?`
4260 operator allows you to specify zero or one repetitions similar to the `*` and
4262 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
4263 now always resolve to the item (`enum`, `struct`, etc.) available in the
4264 module if present, before resolving to a external crate or an item the prelude.][56759]
4267 enum Color { Red, Green, Blue }
4273 - [You can now match against `PhantomData<T>` types.][55837]
4274 - [You can now match against literals in macros with the `literal`
4275 specifier.][56072] This will match against a literal of any type.
4276 E.g. `1`, `'A'`, `"Hello World"`
4277 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
4279 struct Point(i32, i32);
4282 pub fn new(x: i32, y: i32) -> Self {
4286 pub fn is_origin(&self) -> bool {
4294 - [Self can also now be used in type definitions.][56366] E.g.
4298 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
4301 Cons(T, Box<Self>) // likewise here
4304 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
4305 a `impl Trait` or `dyn Trait` is returned and unused in the program.
4309 - [The default allocator has changed from jemalloc to the default allocator on
4310 your system.][55238] The compiler itself on Linux & macOS will still use
4311 jemalloc, but programs compiled with it will use the system allocator.
4312 - [Added the `aarch64-pc-windows-msvc` target.][55702]
4316 - [`PathBuf` now implements `FromStr`.][55148]
4317 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
4318 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
4319 easily debug expressions in your rust program. E.g.
4322 let b = dbg!(a * 2) + 1;
4323 // ^-- prints: [src/main.rs:4] a * 2 = 4
4327 The following APIs are now `const` functions and can be used in a
4331 - [`UnsafeCell::get`]
4332 - [`char::is_ascii`]
4334 - [`ManuallyDrop::new`]
4335 - [`ManuallyDrop::into_inner`]
4336 - [`RangeInclusive::start`]
4337 - [`RangeInclusive::end`]
4338 - [`NonNull::as_ptr`]
4341 - [`Duration::as_secs`]
4342 - [`Duration::subsec_millis`]
4343 - [`Duration::subsec_micros`]
4344 - [`Duration::subsec_nanos`]
4346 - [`Ipv4Addr::is_unspecified`]
4348 - [`Ipv6Addr::octets`]
4352 - [`i8::to_be_bytes`]
4353 - [`i8::to_le_bytes`]
4354 - [`i8::to_ne_bytes`]
4355 - [`i8::from_be_bytes`]
4356 - [`i8::from_le_bytes`]
4357 - [`i8::from_ne_bytes`]
4358 - [`i16::to_be_bytes`]
4359 - [`i16::to_le_bytes`]
4360 - [`i16::to_ne_bytes`]
4361 - [`i16::from_be_bytes`]
4362 - [`i16::from_le_bytes`]
4363 - [`i16::from_ne_bytes`]
4364 - [`i32::to_be_bytes`]
4365 - [`i32::to_le_bytes`]
4366 - [`i32::to_ne_bytes`]
4367 - [`i32::from_be_bytes`]
4368 - [`i32::from_le_bytes`]
4369 - [`i32::from_ne_bytes`]
4370 - [`i64::to_be_bytes`]
4371 - [`i64::to_le_bytes`]
4372 - [`i64::to_ne_bytes`]
4373 - [`i64::from_be_bytes`]
4374 - [`i64::from_le_bytes`]
4375 - [`i64::from_ne_bytes`]
4376 - [`i128::to_be_bytes`]
4377 - [`i128::to_le_bytes`]
4378 - [`i128::to_ne_bytes`]
4379 - [`i128::from_be_bytes`]
4380 - [`i128::from_le_bytes`]
4381 - [`i128::from_ne_bytes`]
4382 - [`isize::to_be_bytes`]
4383 - [`isize::to_le_bytes`]
4384 - [`isize::to_ne_bytes`]
4385 - [`isize::from_be_bytes`]
4386 - [`isize::from_le_bytes`]
4387 - [`isize::from_ne_bytes`]
4388 - [`u8::to_be_bytes`]
4389 - [`u8::to_le_bytes`]
4390 - [`u8::to_ne_bytes`]
4391 - [`u8::from_be_bytes`]
4392 - [`u8::from_le_bytes`]
4393 - [`u8::from_ne_bytes`]
4394 - [`u16::to_be_bytes`]
4395 - [`u16::to_le_bytes`]
4396 - [`u16::to_ne_bytes`]
4397 - [`u16::from_be_bytes`]
4398 - [`u16::from_le_bytes`]
4399 - [`u16::from_ne_bytes`]
4400 - [`u32::to_be_bytes`]
4401 - [`u32::to_le_bytes`]
4402 - [`u32::to_ne_bytes`]
4403 - [`u32::from_be_bytes`]
4404 - [`u32::from_le_bytes`]
4405 - [`u32::from_ne_bytes`]
4406 - [`u64::to_be_bytes`]
4407 - [`u64::to_le_bytes`]
4408 - [`u64::to_ne_bytes`]
4409 - [`u64::from_be_bytes`]
4410 - [`u64::from_le_bytes`]
4411 - [`u64::from_ne_bytes`]
4412 - [`u128::to_be_bytes`]
4413 - [`u128::to_le_bytes`]
4414 - [`u128::to_ne_bytes`]
4415 - [`u128::from_be_bytes`]
4416 - [`u128::from_le_bytes`]
4417 - [`u128::from_ne_bytes`]
4418 - [`usize::to_be_bytes`]
4419 - [`usize::to_le_bytes`]
4420 - [`usize::to_ne_bytes`]
4421 - [`usize::from_be_bytes`]
4422 - [`usize::from_le_bytes`]
4423 - [`usize::from_ne_bytes`]
4427 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4428 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4432 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4436 - [The argument types for AVX's
4437 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4438 been changed from `*const` to `*mut` as the previous implementation
4442 [55148]: https://github.com/rust-lang/rust/pull/55148/
4443 [55238]: https://github.com/rust-lang/rust/pull/55238/
4444 [55280]: https://github.com/rust-lang/rust/pull/55280/
4445 [55610]: https://github.com/rust-lang/rust/pull/55610/
4446 [55663]: https://github.com/rust-lang/rust/pull/55663/
4447 [55702]: https://github.com/rust-lang/rust/pull/55702/
4448 [55837]: https://github.com/rust-lang/rust/pull/55837/
4449 [55843]: https://github.com/rust-lang/rust/pull/55843/
4450 [56072]: https://github.com/rust-lang/rust/pull/56072/
4451 [56245]: https://github.com/rust-lang/rust/pull/56245/
4452 [56365]: https://github.com/rust-lang/rust/pull/56365/
4453 [56366]: https://github.com/rust-lang/rust/pull/56366/
4454 [56395]: https://github.com/rust-lang/rust/pull/56395/
4455 [56759]: https://github.com/rust-lang/rust/pull/56759/
4456 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4457 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4458 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4459 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4460 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4461 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4462 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4463 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4464 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4465 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4466 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4467 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4468 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4469 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4470 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4471 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4472 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4473 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4474 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4475 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4476 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4477 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4478 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4479 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4480 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4481 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4482 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4483 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4484 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4485 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4486 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4487 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4488 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4489 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4490 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4491 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4492 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4493 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4494 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4495 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4496 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4497 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4498 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4499 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4500 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4501 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4502 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4503 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4504 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4505 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4506 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4507 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4508 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4509 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4510 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4511 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4512 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4513 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4514 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4515 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4516 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4517 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4518 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4519 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4520 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4521 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4522 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4523 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4524 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4525 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4526 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4527 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4528 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4529 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4530 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4531 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4532 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4533 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4534 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4535 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4536 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4537 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4538 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4539 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4540 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4541 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4542 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4543 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4544 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4545 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4546 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4547 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4548 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4551 Version 1.31.1 (2018-12-20)
4552 ===========================
4554 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4555 - [Fix broken go-to-definition in RLS][rls/1171]
4556 - [Fix infinite loop on hover in RLS][rls/1170]
4558 [56562]: https://github.com/rust-lang/rust/pull/56562
4559 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4560 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4562 Version 1.31.0 (2018-12-06)
4563 ==========================
4567 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4568 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4569 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4570 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4572 - [You can now define and use `const` functions.][54835] These are currently
4573 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4574 [language reference][const-reference] for what exactly is available.
4575 - [You can now use tool lints, which allow you to scope lints from external
4576 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4577 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4578 a crate, not just in exported functions.][54451]
4579 - [You can now use parentheses in pattern matches.][54497]
4583 - [Updated musl to 1.1.20][54430]
4587 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4588 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4589 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4590 into `Option<&mut T>` using the `From` trait.][53218]
4591 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4596 - [`slice::align_to`]
4597 - [`slice::align_to_mut`]
4598 - [`slice::chunks_exact`]
4599 - [`slice::chunks_exact_mut`]
4600 - [`slice::rchunks`]
4601 - [`slice::rchunks_mut`]
4602 - [`slice::rchunks_exact`]
4603 - [`slice::rchunks_exact_mut`]
4604 - [`Option::replace`]
4608 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4609 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4610 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4612 [52813]: https://github.com/rust-lang/rust/pull/52813/
4613 [53218]: https://github.com/rust-lang/rust/pull/53218/
4614 [54057]: https://github.com/rust-lang/rust/pull/54057/
4615 [54240]: https://github.com/rust-lang/rust/pull/54240/
4616 [54430]: https://github.com/rust-lang/rust/pull/54430/
4617 [54451]: https://github.com/rust-lang/rust/pull/54451/
4618 [54497]: https://github.com/rust-lang/rust/pull/54497/
4619 [54778]: https://github.com/rust-lang/rust/pull/54778/
4620 [54835]: https://github.com/rust-lang/rust/pull/54835/
4621 [54870]: https://github.com/rust-lang/rust/pull/54870/
4622 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4623 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4624 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4625 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4626 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4627 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4628 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4629 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4630 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4631 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4632 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4633 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4634 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4635 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4637 Version 1.30.1 (2018-11-08)
4638 ===========================
4640 - [Fixed overflow ICE in rustdoc][54199]
4641 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4643 [54199]: https://github.com/rust-lang/rust/pull/54199
4644 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4646 Version 1.30.0 (2018-10-25)
4647 ==========================
4651 - [Procedural macros are now available.][52081] These kinds of macros allow for
4652 more powerful code generation. There is a [new chapter available][proc-macros]
4653 in the Rust Programming Language book that goes further in depth.
4654 - [You can now use keywords as identifiers using the raw identifiers
4655 syntax (`r#`),][53236] e.g. `let r#for = true;`
4656 - [Using anonymous parameters in traits is now deprecated with a warning and
4657 will be a hard error in the 2018 edition.][53272]
4658 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4659 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4660 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4661 Previously, using a external crate in a module without a use statement
4662 required `let json = ::serde_json::from_str(foo);` but can now be written
4663 as `let json = serde_json::from_str(foo);`.
4664 - [You can now apply the `#[used]` attribute to static items to prevent the
4665 compiler from optimising them away, even if they appear to be unused,][51363]
4666 e.g. `#[used] static FOO: u32 = 1;`
4667 - [You can now import and reexport macros from other crates with the `use`
4668 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4669 the root module of the crate. If your macro relies on calling other local
4670 macros, it is recommended to export with the
4671 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4673 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4674 using the `vis` specifier.][53370]
4675 - [Non-macro attributes now allow all forms of literals, not just
4676 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4677 write `#[attr(true)]`.
4678 - [You can now specify a function to handle a panic in the Rust runtime with the
4679 `#[panic_handler]` attribute.][51366]
4683 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4684 - [Added the `aarch64-unknown-netbsd` target][53165]
4685 - [Upgraded to LLVM 8.][53611]
4689 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4693 - [`Ipv4Addr::BROADCAST`]
4694 - [`Ipv4Addr::LOCALHOST`]
4695 - [`Ipv4Addr::UNSPECIFIED`]
4696 - [`Ipv6Addr::LOCALHOST`]
4697 - [`Ipv6Addr::UNSPECIFIED`]
4698 - [`Iterator::find_map`]
4700 The following methods are replacement methods for `trim_left`, `trim_right`,
4701 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4703 - [`str::trim_end_matches`]
4705 - [`str::trim_start_matches`]
4706 - [`str::trim_start`]
4710 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4711 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4712 equivalent to calling `rustdoc --error-format=json`.
4713 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4717 - [`rustdoc` allows you to specify what edition to treat your code as with the
4718 `--edition` option.][54057]
4719 - [`rustdoc` now has the `--color` (specify whether to output color) and
4720 `--error-format` (specify error format, e.g. `json`) options.][53003]
4721 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4722 debug symbols.][53774]
4723 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4724 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4726 [50911]: https://github.com/rust-lang/rust/pull/50911/
4727 [51363]: https://github.com/rust-lang/rust/pull/51363/
4728 [51366]: https://github.com/rust-lang/rust/pull/51366/
4729 [52081]: https://github.com/rust-lang/rust/pull/52081/
4730 [53003]: https://github.com/rust-lang/rust/pull/53003/
4731 [53033]: https://github.com/rust-lang/rust/pull/53033/
4732 [53044]: https://github.com/rust-lang/rust/pull/53044/
4733 [53165]: https://github.com/rust-lang/rust/pull/53165/
4734 [53611]: https://github.com/rust-lang/rust/pull/53611/
4735 [53236]: https://github.com/rust-lang/rust/pull/53236/
4736 [53272]: https://github.com/rust-lang/rust/pull/53272/
4737 [53370]: https://github.com/rust-lang/rust/pull/53370/
4738 [53459]: https://github.com/rust-lang/rust/pull/53459/
4739 [53774]: https://github.com/rust-lang/rust/pull/53774/
4740 [53822]: https://github.com/rust-lang/rust/pull/53822/
4741 [54057]: https://github.com/rust-lang/rust/pull/54057/
4742 [54404]: https://github.com/rust-lang/rust/pull/54404/
4743 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4744 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4745 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4746 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4748 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4749 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4750 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4751 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4752 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4753 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4754 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4755 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4756 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4757 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4760 Version 1.29.2 (2018-10-11)
4761 ===========================
4763 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4764 - The `rls-preview` component on the windows-gnu targets has been restored.
4766 [54639]: https://github.com/rust-lang/rust/pull/54639
4769 Version 1.29.1 (2018-09-25)
4770 ===========================
4775 - The standard library's `str::repeat` function contained an out of bounds write
4776 caused by an integer overflow. This has been fixed by deterministically
4777 panicking when an overflow happens.
4779 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4783 Version 1.29.0 (2018-09-13)
4784 ==========================
4788 - [Bumped minimum LLVM version to 5.0.][51899]
4789 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4790 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4791 - [Upgraded to LLVM 7.][51966]
4795 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4796 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4797 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4798 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4800 - [`Cell<T>` now allows `T` to be unsized.][50494]
4801 - [`SocketAddr` is now stable on Redox.][52656]
4806 - [`Iterator::flatten`]
4811 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4812 `--locked` to disable this behavior.
4813 - [`cargo-install` will now allow you to cross compile an install
4814 using `--target`.][cargo/5614]
4815 - [Added the `cargo-fix` subcommand to automatically move project code from
4816 2015 edition to 2018.][cargo/5723]
4817 - [`cargo doc` can now optionally document private types using the
4818 `--document-private-items` flag.][cargo/5543]
4822 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4823 the specified level to that level.][52354] For example `--cap-lints warn`
4824 will demote `deny` and `forbid` lints to `warn`.
4825 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4826 fails and `101` if there is a panic.][52197]
4827 - [A preview of clippy has been made available through rustup.][51122]
4828 You can install the preview with `rustup component add clippy-preview`.
4832 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4833 Use `str::get_unchecked(begin..end)` instead.
4834 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4835 Consider using the `home_dir` function from
4836 https://crates.io/crates/dirs instead.
4837 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4838 - [`cfg` attributes and `--cfg` command line flags are now more
4839 strictly validated.][53893]
4841 [53893]: https://github.com/rust-lang/rust/pull/53893/
4842 [52861]: https://github.com/rust-lang/rust/pull/52861/
4843 [51966]: https://github.com/rust-lang/rust/pull/51966/
4844 [52656]: https://github.com/rust-lang/rust/pull/52656/
4845 [52239]: https://github.com/rust-lang/rust/pull/52239/
4846 [52330]: https://github.com/rust-lang/rust/pull/52330/
4847 [52354]: https://github.com/rust-lang/rust/pull/52354/
4848 [52402]: https://github.com/rust-lang/rust/pull/52402/
4849 [52197]: https://github.com/rust-lang/rust/pull/52197/
4850 [51807]: https://github.com/rust-lang/rust/pull/51807/
4851 [51899]: https://github.com/rust-lang/rust/pull/51899/
4852 [51912]: https://github.com/rust-lang/rust/pull/51912/
4853 [51619]: https://github.com/rust-lang/rust/pull/51619/
4854 [51656]: https://github.com/rust-lang/rust/pull/51656/
4855 [51178]: https://github.com/rust-lang/rust/pull/51178/
4856 [51122]: https://github.com/rust-lang/rust/pull/51122
4857 [50494]: https://github.com/rust-lang/rust/pull/50494/
4858 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4859 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4860 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4861 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4862 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4863 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4864 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4867 Version 1.28.0 (2018-08-02)
4868 ===========================
4872 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4873 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4874 the inner type across Foreign Function Interface (FFI) boundaries.
4875 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4876 and can now be used as identifiers.][51196]
4877 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4878 stable.][51241] This will allow users to specify a global allocator for
4880 - [Unit test functions marked with the `#[test]` attribute can now return
4881 `Result<(), E: Debug>` in addition to `()`.][51298]
4882 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4883 allows macros to easily target lifetimes.
4887 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4888 prioritise making smaller binary sizes. `z` is the same as `s` with the
4889 exception that it does not vectorise loops, which typically results in an even
4891 - [The short error format is now stable.][49546] Specified with
4892 `--error-format=short` this option will provide a more compressed output of
4893 rust error messages.
4894 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4895 - [Reduced the number of allocations in the macro parser.][50855] This can
4896 improve compile times of macro heavy crates on average by 5%.
4900 - [Implemented `Default` for `&mut str`.][51306]
4901 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4902 - [Implemented `Extend` for `()`.][50234]
4903 - [The `Debug` implementation of `time::Duration` should now be more easily
4904 human readable.][50364] Previously a `Duration` of one second would printed as
4905 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4906 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4907 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4908 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4909 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4910 for `PathBuf`.][50170]
4911 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4912 and `Wrapping<i128>`.][50465]
4913 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4914 possible.][51050] This can provide up to a 40% speed increase.
4915 - [Improved error messages when using `format!`.][50610]
4919 - [`Iterator::step_by`]
4920 - [`Path::ancestors`]
4921 - [`SystemTime::UNIX_EPOCH`]
4922 - [`alloc::GlobalAlloc`]
4924 - [`alloc::LayoutErr`]
4927 - [`alloc::alloc_zeroed`]
4928 - [`alloc::dealloc`]
4929 - [`alloc::realloc`]
4930 - [`alloc::handle_alloc_error`]
4931 - [`btree_map::Entry::or_default`]
4932 - [`fmt::Alignment`]
4933 - [`hash_map::Entry::or_default`]
4934 - [`iter::repeat_with`]
4935 - [`num::NonZeroUsize`]
4936 - [`num::NonZeroU128`]
4937 - [`num::NonZeroU16`]
4938 - [`num::NonZeroU32`]
4939 - [`num::NonZeroU64`]
4940 - [`num::NonZeroU8`]
4941 - [`ops::RangeBounds`]
4942 - [`slice::SliceIndex`]
4943 - [`slice::from_mut`]
4944 - [`slice::from_ref`]
4945 - [`{Any + Send + Sync}::downcast_mut`]
4946 - [`{Any + Send + Sync}::downcast_ref`]
4947 - [`{Any + Send + Sync}::is`]
4951 - [Cargo will now no longer allow you to publish crates with build scripts that
4952 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4953 considered to be immutable.
4957 - [The `suggestion_applicability` field in `rustc`'s json output is now
4958 stable.][50486] This will allow dev tools to check whether a code suggestion
4959 would apply to them.
4963 - [Rust will consider trait objects with duplicated constraints to be the same
4964 type as without the duplicated constraint.][51276] For example the below code will
4965 now fail to compile.
4970 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4973 impl Trait + Send + Send {
4974 fn test(&self) { println!("two"); }
4978 [49546]: https://github.com/rust-lang/rust/pull/49546/
4979 [50143]: https://github.com/rust-lang/rust/pull/50143/
4980 [50170]: https://github.com/rust-lang/rust/pull/50170/
4981 [50234]: https://github.com/rust-lang/rust/pull/50234/
4982 [50265]: https://github.com/rust-lang/rust/pull/50265/
4983 [50364]: https://github.com/rust-lang/rust/pull/50364/
4984 [50385]: https://github.com/rust-lang/rust/pull/50385/
4985 [50465]: https://github.com/rust-lang/rust/pull/50465/
4986 [50486]: https://github.com/rust-lang/rust/pull/50486/
4987 [50554]: https://github.com/rust-lang/rust/pull/50554/
4988 [50610]: https://github.com/rust-lang/rust/pull/50610/
4989 [50855]: https://github.com/rust-lang/rust/pull/50855/
4990 [51050]: https://github.com/rust-lang/rust/pull/51050/
4991 [51196]: https://github.com/rust-lang/rust/pull/51196/
4992 [51241]: https://github.com/rust-lang/rust/pull/51241/
4993 [51276]: https://github.com/rust-lang/rust/pull/51276/
4994 [51298]: https://github.com/rust-lang/rust/pull/51298/
4995 [51306]: https://github.com/rust-lang/rust/pull/51306/
4996 [51562]: https://github.com/rust-lang/rust/pull/51562/
4997 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4998 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4999 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
5000 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
5001 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
5002 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
5003 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
5004 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
5005 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
5006 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
5007 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
5008 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
5009 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
5010 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
5011 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
5012 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
5013 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
5014 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
5015 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
5016 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
5017 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
5018 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
5019 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
5020 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
5021 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
5022 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
5023 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
5024 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
5025 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
5026 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
5028 Version 1.27.2 (2018-07-20)
5029 ===========================
5034 - The borrow checker was fixed to avoid potential unsoundness when using
5035 match ergonomics: [#52213][52213].
5037 [52213]: https://github.com/rust-lang/rust/issues/52213
5039 Version 1.27.1 (2018-07-10)
5040 ===========================
5045 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
5046 when running, which enabled executing code as some other user on a
5047 given machine. This release fixes that vulnerability; you can read
5048 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
5050 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
5055 - The borrow checker was fixed to avoid an additional potential unsoundness when using
5056 match ergonomics: [#51415][51415], [#49534][49534].
5058 [51415]: https://github.com/rust-lang/rust/issues/51415
5059 [49534]: https://github.com/rust-lang/rust/issues/49534
5060 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
5061 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
5063 Version 1.27.0 (2018-06-21)
5064 ==========================
5068 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
5069 be used as an identifier.
5070 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
5071 bare `Trait` syntax, and should make it clearer when being used in tandem with
5072 `impl Trait` because it is equivalent to the following syntax:
5073 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
5074 `Box<Trait> == Box<dyn Trait>`.
5075 - [Attributes on generic parameters such as types and lifetimes are
5076 now stable.][48851] e.g.
5077 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
5078 - [The `#[must_use]` attribute can now also be used on functions as well as
5079 types.][48925] It provides a lint that by default warns users when the
5080 value returned by a function has not been used.
5084 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
5088 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
5089 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
5090 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
5091 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
5092 the `cfg` attribute.
5093 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
5094 std are now available in core.][49896]
5095 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
5097 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
5098 that the operation isn't done in place.
5099 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
5100 the `#[must_use]` attribute][49533] to warn about unused potentially
5101 expensive allocations.
5105 - [`DoubleEndedIterator::rfind`]
5106 - [`DoubleEndedIterator::rfold`]
5107 - [`DoubleEndedIterator::try_rfold`]
5108 - [`Duration::from_micros`]
5109 - [`Duration::from_nanos`]
5110 - [`Duration::subsec_micros`]
5111 - [`Duration::subsec_millis`]
5112 - [`HashMap::remove_entry`]
5113 - [`Iterator::try_fold`]
5114 - [`Iterator::try_for_each`]
5116 - [`Option::filter`]
5117 - [`String::replace_range`]
5118 - [`Take::set_limit`]
5119 - [`hint::unreachable_unchecked`]
5120 - [`os::unix::process::parent_id`]
5121 - [`ptr::swap_nonoverlapping`]
5122 - [`slice::rsplit_mut`]
5124 - [`slice::swap_with_slice`]
5128 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
5129 `readme`, and `repository` fields.][cargo/5386]
5130 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
5131 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
5132 a different directory than `target` for placing compilation artifacts.
5133 - [Cargo will be adding automatic target inference for binaries, benchmarks,
5134 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
5135 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
5136 where cargo would infer a binary, Cargo will produce a warning. You can
5137 disable this feature ahead of time by setting any of the following to false:
5138 `autobins`, `autobenches`, `autoexamples`, `autotests`.
5139 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
5140 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
5144 - [Added “The Rustc book” into the official documentation.][49707]
5145 [“The Rustc book”] documents and teaches how to use the rustc compiler.
5146 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
5150 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
5151 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
5152 compile, `"".is_empty()` will still compile.
5153 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
5154 will only print the inner type.][48553] E.g.
5155 `print!("{:?}", AtomicBool::new(true))` will print `true`,
5156 not `AtomicBool(true)`.
5157 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
5158 could enter higher numbers but they were not supported by LLVM. Up to 512MB
5159 alignment should cover all use cases.
5160 - The `.description()` method on the `std::error::Error` trait
5161 [has been soft-deprecated][50163]. It is no longer required to implement it.
5163 [48553]: https://github.com/rust-lang/rust/pull/48553/
5164 [48851]: https://github.com/rust-lang/rust/pull/48851/
5165 [48925]: https://github.com/rust-lang/rust/pull/48925/
5166 [49533]: https://github.com/rust-lang/rust/pull/49533/
5167 [49623]: https://github.com/rust-lang/rust/pull/49623/
5168 [49630]: https://github.com/rust-lang/rust/pull/49630/
5169 [49664]: https://github.com/rust-lang/rust/pull/49664/
5170 [49699]: https://github.com/rust-lang/rust/pull/49699/
5171 [49707]: https://github.com/rust-lang/rust/pull/49707/
5172 [49896]: https://github.com/rust-lang/rust/pull/49896/
5173 [49968]: https://github.com/rust-lang/rust/pull/49968/
5174 [50163]: https://github.com/rust-lang/rust/pull/50163
5175 [50177]: https://github.com/rust-lang/rust/pull/50177/
5176 [50378]: https://github.com/rust-lang/rust/pull/50378/
5177 [50423]: https://github.com/rust-lang/rust/pull/50423/
5178 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
5179 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
5180 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
5181 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
5182 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
5183 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
5184 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
5185 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
5186 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
5187 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
5188 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
5189 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
5190 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
5191 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
5192 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
5193 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
5194 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
5195 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
5196 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
5197 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
5198 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
5199 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5200 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
5201 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
5202 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
5203 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
5204 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
5205 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
5206 [“The Rustc book”]: https://doc.rust-lang.org/rustc
5209 Version 1.26.2 (2018-06-05)
5210 ==========================
5215 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
5217 [51117]: https://github.com/rust-lang/rust/issues/51117
5220 Version 1.26.1 (2018-05-29)
5221 ==========================
5226 - [RLS now works on Windows.][50646]
5227 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
5233 - [`fn main() -> impl Trait` no longer works for non-Termination
5235 This reverts an accidental stabilization.
5236 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
5237 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
5239 [50646]: https://github.com/rust-lang/rust/issues/50646
5240 [50656]: https://github.com/rust-lang/rust/pull/50656
5241 [50812]: https://github.com/rust-lang/rust/pull/50812
5242 [50950]: https://github.com/rust-lang/rust/issues/50950
5243 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
5245 Version 1.26.0 (2018-05-10)
5246 ==========================
5250 - [Closures now implement `Copy` and/or `Clone` if all captured variables
5251 implement either or both traits.][49299]
5252 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
5253 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
5254 lifetime can be elided.][49458]
5255 - [`impl Trait` is now stable allowing you to have abstract types in returns
5256 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
5257 `fn open(path: impl AsRef<Path>)`.
5258 - [Pattern matching will now automatically apply dereferences.][49394]
5259 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
5260 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
5261 - [A lot of operations are now available in a const context.][46882] E.g. You
5262 can now index into constant arrays, reference and dereference into constants,
5263 and use tuple struct constructors.
5264 - [Fixed entry slice patterns are now stable.][48516] E.g.
5266 let points = [1, 2, 3, 4];
5268 [1, 2, 3, 4] => println!("All points were sequential."),
5269 _ => println!("Not all points were sequential."),
5276 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
5277 - [Fixed exponential projection complexity on nested types.][48296]
5278 This can provide up to a ~12% reduction in compile times for certain crates.
5279 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
5280 to remap path prefixes outputted by the compiler.
5281 - [Added `powerpc-unknown-netbsd` target.][48281]
5285 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
5286 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
5287 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
5288 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
5289 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
5290 - [`ascii::escape_default` is now available in libcore.][48735]
5291 - [Trailing commas are now supported in std and core macros.][48056]
5292 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
5293 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
5298 - [`*const T::copy_to_nonoverlapping`]
5299 - [`*const T::copy_to`]
5300 - [`*const T::read_unaligned`]
5301 - [`*const T::read_volatile`]
5302 - [`*const T::read`]
5304 - [`*const T::wrapping_add`]
5305 - [`*const T::wrapping_sub`]
5307 - [`*mut T::copy_to_nonoverlapping`]
5308 - [`*mut T::copy_to`]
5309 - [`*mut T::read_unaligned`]
5310 - [`*mut T::read_volatile`]
5312 - [`*mut T::replace`]
5315 - [`*mut T::wrapping_add`]
5316 - [`*mut T::wrapping_sub`]
5317 - [`*mut T::write_bytes`]
5318 - [`*mut T::write_unaligned`]
5319 - [`*mut T::write_volatile`]
5322 - [`FromUtf8Error::as_bytes`]
5323 - [`LocalKey::try_with`]
5324 - [`Option::cloned`]
5325 - [`btree_map::Entry::and_modify`]
5326 - [`fs::read_to_string`]
5329 - [`hash_map::Entry::and_modify`]
5330 - [`iter::FusedIterator`]
5331 - [`ops::RangeInclusive`]
5332 - [`ops::RangeToInclusive`]
5334 - [`slice::rotate_left`]
5335 - [`slice::rotate_right`]
5336 - [`String::retain`]
5341 - [Cargo will now output path to custom commands when `-v` is
5342 passed with `--list`][cargo/5041]
5343 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
5347 - [The second edition of "The Rust Programming Language" book is now recommended
5348 over the first.][48404]
5353 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
5354 syntax is now invalid.
5356 use std::ops::Fn as dyn;
5357 fn g(_: Box<dyn(std::fmt::Debug)>) {}
5359 - [The result of dereferences are no longer promoted to `'static`.][47408]
5363 const PAIR: &(i32, i32) = &(0, 1);
5364 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
5367 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
5368 - [`".e0"` will now no longer parse as `0.0` and will instead cause
5370 - [Removed hoedown from rustdoc.][48274]
5371 - [Bounds on higher-kinded lifetimes a hard error.][48326]
5373 [46882]: https://github.com/rust-lang/rust/pull/46882
5374 [47379]: https://github.com/rust-lang/rust/pull/47379
5375 [47408]: https://github.com/rust-lang/rust/pull/47408
5376 [47813]: https://github.com/rust-lang/rust/pull/47813
5377 [48056]: https://github.com/rust-lang/rust/pull/48056
5378 [48125]: https://github.com/rust-lang/rust/pull/48125
5379 [48235]: https://github.com/rust-lang/rust/pull/48235
5380 [48274]: https://github.com/rust-lang/rust/pull/48274
5381 [48281]: https://github.com/rust-lang/rust/pull/48281
5382 [48296]: https://github.com/rust-lang/rust/pull/48296
5383 [48326]: https://github.com/rust-lang/rust/pull/48326
5384 [48359]: https://github.com/rust-lang/rust/pull/48359
5385 [48404]: https://github.com/rust-lang/rust/pull/48404
5386 [48481]: https://github.com/rust-lang/rust/pull/48481
5387 [48516]: https://github.com/rust-lang/rust/pull/48516
5388 [48628]: https://github.com/rust-lang/rust/pull/48628
5389 [48629]: https://github.com/rust-lang/rust/pull/48629
5390 [48657]: https://github.com/rust-lang/rust/pull/48657
5391 [48735]: https://github.com/rust-lang/rust/pull/48735
5392 [48978]: https://github.com/rust-lang/rust/pull/48978
5393 [49101]: https://github.com/rust-lang/rust/pull/49101
5394 [49109]: https://github.com/rust-lang/rust/pull/49109
5395 [49162]: https://github.com/rust-lang/rust/pull/49162
5396 [49255]: https://github.com/rust-lang/rust/pull/49255
5397 [49299]: https://github.com/rust-lang/rust/pull/49299
5398 [49305]: https://github.com/rust-lang/rust/pull/49305
5399 [49394]: https://github.com/rust-lang/rust/pull/49394
5400 [49458]: https://github.com/rust-lang/rust/pull/49458
5401 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
5402 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
5403 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
5404 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
5405 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
5406 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
5407 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
5408 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
5409 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
5410 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
5411 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
5412 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
5413 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
5414 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
5415 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
5416 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
5417 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
5418 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
5419 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
5420 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
5421 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
5422 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
5423 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5424 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5425 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5426 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5427 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5428 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5429 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5430 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5431 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5432 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5433 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5434 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5435 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5436 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5437 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5438 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5439 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5440 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5441 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5442 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5445 Version 1.25.0 (2018-03-29)
5446 ==========================
5450 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5451 - [You can now use nested groups of imports.][47948]
5452 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5453 - [You can now have `|` at the start of a match arm.][47947] e.g.
5455 enum Foo { A, B, C }
5461 | Foo::B => println!("AB"),
5462 | Foo::C => println!("C"),
5469 - [Upgraded to LLVM 6.][47828]
5470 - [Added `-C lto=val` option.][47521]
5471 - [Added `i586-unknown-linux-musl` target][47282]
5475 - [Impl Send for `process::Command` on Unix.][47760]
5476 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5477 - [`UnsafeCell::into_inner` is now safe.][47204]
5478 - [Implement libstd for CloudABI.][47268]
5479 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5480 - [Implement `AsRef<Path>` for Component][46985]
5481 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5482 - [Moved `Duration` to libcore.][46666]
5486 - [`Location::column`]
5489 The following functions can now be used in a constant expression.
5490 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5491 - [`Duration::new`][47300]
5492 - [`Duration::from_secs`][47300]
5493 - [`Duration::from_millis`][47300]
5497 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5498 - [`cargo new` now defaults to creating a binary crate, instead of a
5499 library crate.][cargo/5029]
5503 - [Rust by example is now shipped with new releases][46196]
5507 - [Deprecated `net::lookup_host`.][47510]
5508 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5509 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5510 around indexing operations (see [#47349][47349]). This has been fixed (which also
5511 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5512 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5514 [33903]: https://github.com/rust-lang/rust/pull/33903
5515 [47947]: https://github.com/rust-lang/rust/pull/47947
5516 [47948]: https://github.com/rust-lang/rust/pull/47948
5517 [47760]: https://github.com/rust-lang/rust/pull/47760
5518 [47790]: https://github.com/rust-lang/rust/pull/47790
5519 [47828]: https://github.com/rust-lang/rust/pull/47828
5520 [47398]: https://github.com/rust-lang/rust/pull/47398
5521 [47510]: https://github.com/rust-lang/rust/pull/47510
5522 [47521]: https://github.com/rust-lang/rust/pull/47521
5523 [47204]: https://github.com/rust-lang/rust/pull/47204
5524 [47251]: https://github.com/rust-lang/rust/pull/47251
5525 [47268]: https://github.com/rust-lang/rust/pull/47268
5526 [47282]: https://github.com/rust-lang/rust/pull/47282
5527 [47300]: https://github.com/rust-lang/rust/pull/47300
5528 [47349]: https://github.com/rust-lang/rust/pull/47349
5529 [46931]: https://github.com/rust-lang/rust/pull/46931
5530 [46985]: https://github.com/rust-lang/rust/pull/46985
5531 [47006]: https://github.com/rust-lang/rust/pull/47006
5532 [46830]: https://github.com/rust-lang/rust/pull/46830
5533 [46095]: https://github.com/rust-lang/rust/pull/46095
5534 [46666]: https://github.com/rust-lang/rust/pull/46666
5535 [46196]: https://github.com/rust-lang/rust/pull/46196
5536 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5537 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5538 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5539 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5540 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5543 Version 1.24.1 (2018-03-01)
5544 ==========================
5546 - [Do not abort when unwinding through FFI][48251]
5547 - [Emit UTF-16 files for linker arguments on Windows][48318]
5548 - [Make the error index generator work again][48308]
5549 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5551 [48251]: https://github.com/rust-lang/rust/issues/48251
5552 [48308]: https://github.com/rust-lang/rust/issues/48308
5553 [48318]: https://github.com/rust-lang/rust/issues/48318
5554 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5557 Version 1.24.0 (2018-02-15)
5558 ==========================
5562 - [External `sysv64` ffi is now available.][46528]
5563 eg. `extern "sysv64" fn foo () {}`
5567 - [rustc now uses 16 codegen units by default for release builds.][46910]
5568 For the fastest builds, utilize `codegen-units=1`.
5569 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5570 - [Add `aarch64-unknown-openbsd` support][46760]
5574 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5575 improvement in performance in the majority of cases.
5576 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5577 with Windows.][46798]
5578 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5579 - [impl `From<bool>` for `AtomicBool`][46293]
5580 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5581 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5582 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5583 - [float::from_bits now just uses transmute.][46012] This provides
5584 some optimisations from LLVM.
5585 - [Copied `AsciiExt` methods onto `char`][46077]
5586 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5587 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5588 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5589 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5593 - [`RefCell::replace`]
5595 - [`atomic::spin_loop_hint`]
5597 The following functions can now be used in a constant expression.
5598 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5600 - [`AtomicBool::new`][46287]
5601 - [`AtomicUsize::new`][46287]
5602 - [`AtomicIsize::new`][46287]
5603 - [`AtomicPtr::new`][46287]
5604 - [`Cell::new`][46287]
5605 - [`{integer}::min_value`][46287]
5606 - [`{integer}::max_value`][46287]
5607 - [`mem::size_of`][46287]
5608 - [`mem::align_of`][46287]
5609 - [`ptr::null`][46287]
5610 - [`ptr::null_mut`][46287]
5611 - [`RefCell::new`][46287]
5612 - [`UnsafeCell::new`][46287]
5616 - [Added a `workspace.default-members` config that
5617 overrides implied `--all` in virtual workspaces.][cargo/4743]
5618 - [Enable incremental by default on development builds.][cargo/4817] Also added
5619 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5620 per-project or global basis respectively.
5627 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5628 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5629 in accordance with IETF RFC 4291 §2.2.
5630 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5631 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5632 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5633 - [Leading zeros in tuple struct members is now an error][47084]
5634 - [`column!()` macro is one-based instead of zero-based][46977]
5635 - [`fmt::Arguments` can no longer be shared across threads][45198]
5636 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5637 - [Cargo sets a different working directory for the compiler][cargo/4788]
5639 [44884]: https://github.com/rust-lang/rust/pull/44884
5640 [45198]: https://github.com/rust-lang/rust/pull/45198
5641 [45506]: https://github.com/rust-lang/rust/pull/45506
5642 [45990]: https://github.com/rust-lang/rust/pull/45990
5643 [46012]: https://github.com/rust-lang/rust/pull/46012
5644 [46077]: https://github.com/rust-lang/rust/pull/46077
5645 [46094]: https://github.com/rust-lang/rust/pull/46094
5646 [46284]: https://github.com/rust-lang/rust/pull/46284
5647 [46287]: https://github.com/rust-lang/rust/pull/46287
5648 [46293]: https://github.com/rust-lang/rust/pull/46293
5649 [46528]: https://github.com/rust-lang/rust/pull/46528
5650 [46671]: https://github.com/rust-lang/rust/pull/46671
5651 [46713]: https://github.com/rust-lang/rust/pull/46713
5652 [46735]: https://github.com/rust-lang/rust/pull/46735
5653 [46760]: https://github.com/rust-lang/rust/pull/46760
5654 [46798]: https://github.com/rust-lang/rust/pull/46798
5655 [46828]: https://github.com/rust-lang/rust/pull/46828
5656 [46831]: https://github.com/rust-lang/rust/pull/46831
5657 [46833]: https://github.com/rust-lang/rust/pull/46833
5658 [46910]: https://github.com/rust-lang/rust/pull/46910
5659 [46977]: https://github.com/rust-lang/rust/pull/46977
5660 [47018]: https://github.com/rust-lang/rust/pull/47018
5661 [47080]: https://github.com/rust-lang/rust/pull/47080
5662 [47084]: https://github.com/rust-lang/rust/pull/47084
5663 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5664 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5665 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5666 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5667 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5668 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5671 Version 1.23.0 (2018-01-04)
5672 ==========================
5676 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5677 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5678 Which should fix some confusing errors in some operations.
5682 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5683 undefined behavior.][45920]
5684 - [rustc now suggests renaming import if names clash.][45660]
5685 - [Display errors/warnings correctly when there are zero-width or
5686 wide characters.][45711]
5687 - [rustc now avoids unnecessary copies of arguments that are
5688 simple bindings][45380] This should improve memory usage on average by 5-10%.
5689 - [Updated musl used to build musl rustc to 1.1.17][45393]
5693 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5694 - [Implement Hash for raw pointers to unsized types][45483]
5695 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5696 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5697 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5698 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5699 and `<*mut T>::as_mut`][44932]
5700 - [Optimized `Thread::{park, unpark}` implementation][45524]
5701 - [Improved `SliceExt::binary_search` performance.][45333]
5702 - [impl `FromIterator<()>` for `()`][45379]
5703 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5711 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5712 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5713 - [Added unit test checking to `cargo check`][cargo/4592]
5714 - [Cargo now lets you install a specific version
5715 using `cargo install --version`][cargo/4637]
5719 - [Releases now ship with the Cargo book documentation.][45692]
5720 - [rustdoc now prints rendering warnings on every run.][45324]
5724 - [Changes have been made to type equality to make it more correct,
5725 in rare cases this could break some code.][45853] [Tracking issue for
5726 further information][45852]
5727 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5728 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5729 Android 9, the minimum supported version is Android 14.
5730 - [Bumped the minimum LLVM to 3.9][45326]
5732 [44042]: https://github.com/rust-lang/rust/pull/44042
5733 [44932]: https://github.com/rust-lang/rust/pull/44932
5734 [45267]: https://github.com/rust-lang/rust/pull/45267
5735 [45324]: https://github.com/rust-lang/rust/pull/45324
5736 [45326]: https://github.com/rust-lang/rust/pull/45326
5737 [45333]: https://github.com/rust-lang/rust/pull/45333
5738 [45379]: https://github.com/rust-lang/rust/pull/45379
5739 [45380]: https://github.com/rust-lang/rust/pull/45380
5740 [45393]: https://github.com/rust-lang/rust/pull/45393
5741 [45435]: https://github.com/rust-lang/rust/pull/45435
5742 [45483]: https://github.com/rust-lang/rust/pull/45483
5743 [45524]: https://github.com/rust-lang/rust/pull/45524
5744 [45571]: https://github.com/rust-lang/rust/pull/45571
5745 [45580]: https://github.com/rust-lang/rust/pull/45580
5746 [45610]: https://github.com/rust-lang/rust/pull/45610
5747 [45660]: https://github.com/rust-lang/rust/pull/45660
5748 [45692]: https://github.com/rust-lang/rust/pull/45692
5749 [45711]: https://github.com/rust-lang/rust/pull/45711
5750 [45772]: https://github.com/rust-lang/rust/pull/45772
5751 [45852]: https://github.com/rust-lang/rust/issues/45852
5752 [45853]: https://github.com/rust-lang/rust/pull/45853
5753 [45887]: https://github.com/rust-lang/rust/pull/45887
5754 [45920]: https://github.com/rust-lang/rust/pull/45920
5755 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5756 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5757 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5760 Version 1.22.1 (2017-11-22)
5761 ==========================
5763 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5765 [46183]: https://github.com/rust-lang/rust/pull/46183
5767 Version 1.22.0 (2017-11-22)
5768 ==========================
5772 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5773 - [Now accepts underscores in unicode escapes][43716]
5774 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5775 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5779 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5780 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5781 This should decrease compile times for debug builds.
5782 - [strict memory alignment now enabled on ARMv6][45094]
5783 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5787 - [Allow atomic operations up to 32 bits
5788 on `armv5te_unknown_linux_gnueabi`][44978]
5789 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5790 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5791 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5792 - [Properly detect overflow in `Instant += Duration`.][44220]
5793 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5794 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5795 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5802 - [Cargo will now build multi file examples in subdirectories of the `examples`
5803 folder that have a `main.rs` file.][cargo/4496]
5804 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5805 the old format will continue to work and can be updated with `cargo update`.
5806 - [Now supports vendoring git repositories][cargo/3992]
5810 - [`libbacktrace` is now available on Apple platforms.][44251]
5811 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5812 This now lets you specify that a given code example will fail to compile.
5816 - [The minimum Android version that rustc can build for has been bumped
5817 to `4.0` from `2.3`][45656]
5818 - [Allowing `T op= &T` for numeric types has broken some type
5819 inference cases][45480]
5822 [42526]: https://github.com/rust-lang/rust/pull/42526
5823 [43716]: https://github.com/rust-lang/rust/pull/43716
5824 [43949]: https://github.com/rust-lang/rust/pull/43949
5825 [44015]: https://github.com/rust-lang/rust/pull/44015
5826 [44220]: https://github.com/rust-lang/rust/pull/44220
5827 [44251]: https://github.com/rust-lang/rust/pull/44251
5828 [44287]: https://github.com/rust-lang/rust/pull/44287
5829 [44303]: https://github.com/rust-lang/rust/pull/44303
5830 [44456]: https://github.com/rust-lang/rust/pull/44456
5831 [44466]: https://github.com/rust-lang/rust/pull/44466
5832 [44895]: https://github.com/rust-lang/rust/pull/44895
5833 [44966]: https://github.com/rust-lang/rust/pull/44966
5834 [44978]: https://github.com/rust-lang/rust/pull/44978
5835 [45041]: https://github.com/rust-lang/rust/pull/45041
5836 [45064]: https://github.com/rust-lang/rust/pull/45064
5837 [45075]: https://github.com/rust-lang/rust/pull/45075
5838 [45094]: https://github.com/rust-lang/rust/pull/45094
5839 [45095]: https://github.com/rust-lang/rust/pull/45095
5840 [45480]: https://github.com/rust-lang/rust/issues/45480
5841 [45656]: https://github.com/rust-lang/rust/pull/45656
5842 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5843 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5844 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5851 Version 1.21.0 (2017-10-12)
5852 ==========================
5856 - [You can now use static references for literals.][43838]
5860 let x: &'static u32 = &0;
5863 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5866 my_macro!(Vec<i32>::new); // Always worked
5867 my_macro!(Vec::<i32>::new); // Now works
5872 - [Upgraded jemalloc to 4.5.0][43911]
5873 - [Enabled unwinding panics on Redox][43917]
5874 - [Now runs LLVM in parallel during translation phase.][43506]
5875 This should reduce peak memory usage.
5879 - [Generate builtin impls for `Clone` for all arrays and tuples that
5880 are `T: Clone`][43690]
5881 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5882 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5883 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5888 [`std::mem::discriminant`]
5892 - [You can now call `cargo install` with multiple package names][cargo/4216]
5893 - [Cargo commands inside a virtual workspace will now implicitly
5894 pass `--all`][cargo/4335]
5895 - [Added a `[patch]` section to `Cargo.toml` to handle
5896 prepublication dependencies][cargo/4123] [RFC 1969]
5897 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5898 like patterns][cargo/4270]
5899 - [Added the `--all-targets` option][cargo/4400]
5900 - [Using required dependencies as a feature is now deprecated and emits
5901 a warning][cargo/4364]
5906 - [Cargo docs are moving][43916]
5907 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5908 - [The rustdoc book is now available][43863]
5909 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5910 - [Added a preview of RLS has been made available through rustup][44204]
5911 Install with `rustup component add rls-preview`
5912 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5913 Previously only showed `std::os::unix`.
5917 - [Changes in method matching against higher-ranked types][43880] This may cause
5918 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5919 - [rustc's JSON error output's byte position start at top of file.][42973]
5920 Was previously relative to the rustc's internal `CodeMap` struct which
5921 required the unstable library `libsyntax` to correctly use.
5922 - [`unused_results` lint no longer ignores booleans][43728]
5924 [42565]: https://github.com/rust-lang/rust/pull/42565
5925 [42973]: https://github.com/rust-lang/rust/pull/42973
5926 [43348]: https://github.com/rust-lang/rust/pull/43348
5927 [43459]: https://github.com/rust-lang/rust/pull/43459
5928 [43506]: https://github.com/rust-lang/rust/pull/43506
5929 [43540]: https://github.com/rust-lang/rust/pull/43540
5930 [43690]: https://github.com/rust-lang/rust/pull/43690
5931 [43728]: https://github.com/rust-lang/rust/pull/43728
5932 [43838]: https://github.com/rust-lang/rust/pull/43838
5933 [43863]: https://github.com/rust-lang/rust/pull/43863
5934 [43880]: https://github.com/rust-lang/rust/pull/43880
5935 [43911]: https://github.com/rust-lang/rust/pull/43911
5936 [43916]: https://github.com/rust-lang/rust/pull/43916
5937 [43917]: https://github.com/rust-lang/rust/pull/43917
5938 [44204]: https://github.com/rust-lang/rust/pull/44204
5939 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5940 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5941 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5942 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5943 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5944 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5945 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5946 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5947 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5949 Version 1.20.0 (2017-08-31)
5950 ===========================
5954 - [Associated constants are now stabilised.][42809]
5955 - [A lot of macro bugs are now fixed.][42913]
5960 - [Struct fields are now properly coerced to the expected field type.][42807]
5961 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5962 `wasm32-experimental-emscripten` target.
5963 - [Changed some of the error messages to be more helpful.][42033]
5964 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5966 - [rustc now reports the total number of errors on compilation failure][43015]
5967 previously this was only the number of errors in the pass that failed.
5968 - [Expansion in rustc has been sped up 29x.][42533]
5969 - [added `msp430-none-elf` target.][43099]
5970 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5972 - [Fixes backtraces on Redox][43228]
5973 - [rustc now identifies different versions of same crate when absolute paths of
5974 different types match in an error message.][42826]
5980 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5981 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5983 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5984 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5985 - [Impl `Clone` for `DefaultHasher`.][42799]
5986 - [Impl `Sync` for `SyncSender`.][42397]
5987 - [Impl `FromStr` for `char`][42271]
5988 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5990 - [allow messages in the `unimplemented!()` macro.][42155]
5991 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5992 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5993 - [Upgrade to Unicode 10.0.0][42999]
5994 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5995 - [Skip the main thread's manual stack guard on Linux][43072]
5996 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5997 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5999 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
6004 - [`CStr::into_c_string`]
6005 - [`CString::as_c_str`]
6006 - [`CString::into_boxed_c_str`]
6007 - [`Chain::get_mut`]
6008 - [`Chain::get_ref`]
6009 - [`Chain::into_inner`]
6010 - [`Option::get_or_insert_with`]
6011 - [`Option::get_or_insert`]
6012 - [`OsStr::into_os_string`]
6013 - [`OsString::into_boxed_os_str`]
6016 - [`Utf8Error::error_len`]
6017 - [`char::EscapeDebug`]
6018 - [`char::escape_debug`]
6019 - [`compile_error!`]
6020 - [`f32::from_bits`]
6022 - [`f64::from_bits`]
6024 - [`mem::ManuallyDrop`]
6025 - [`slice::sort_unstable_by_key`]
6026 - [`slice::sort_unstable_by`]
6027 - [`slice::sort_unstable`]
6028 - [`str::from_boxed_utf8_unchecked`]
6029 - [`str::as_bytes_mut`]
6030 - [`str::as_bytes_mut`]
6031 - [`str::from_utf8_mut`]
6032 - [`str::from_utf8_unchecked_mut`]
6034 - [`str::get_unchecked_mut`]
6035 - [`str::get_unchecked`]
6037 - [`str::into_boxed_bytes`]
6042 - [Cargo API token location moved from `~/.cargo/config` to
6043 `~/.cargo/credentials`.][cargo/3978]
6044 - [Cargo will now build `main.rs` binaries that are in sub-directories of
6045 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
6046 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
6047 - [You can now specify version of a binary when installed through
6048 `cargo install` using `--vers`.][cargo/4229]
6049 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
6050 failure.][cargo/4248]
6051 - [Changed the convention around which file is the crate root.][cargo/4259]
6056 - [Functions with `'static` in their return types will now not be as usable as
6057 if they were using lifetime parameters instead.][42417]
6058 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
6059 takes the sign of NaN into account where previously didn't.][42430]
6061 [42033]: https://github.com/rust-lang/rust/pull/42033
6062 [42155]: https://github.com/rust-lang/rust/pull/42155
6063 [42271]: https://github.com/rust-lang/rust/pull/42271
6064 [42397]: https://github.com/rust-lang/rust/pull/42397
6065 [42417]: https://github.com/rust-lang/rust/pull/42417
6066 [42430]: https://github.com/rust-lang/rust/pull/42430
6067 [42431]: https://github.com/rust-lang/rust/pull/42431
6068 [42533]: https://github.com/rust-lang/rust/pull/42533
6069 [42571]: https://github.com/rust-lang/rust/pull/42571
6070 [42613]: https://github.com/rust-lang/rust/pull/42613
6071 [42799]: https://github.com/rust-lang/rust/pull/42799
6072 [42807]: https://github.com/rust-lang/rust/pull/42807
6073 [42809]: https://github.com/rust-lang/rust/pull/42809
6074 [42822]: https://github.com/rust-lang/rust/pull/42822
6075 [42826]: https://github.com/rust-lang/rust/pull/42826
6076 [42854]: https://github.com/rust-lang/rust/pull/42854
6077 [42913]: https://github.com/rust-lang/rust/pull/42913
6078 [42999]: https://github.com/rust-lang/rust/pull/42999
6079 [43011]: https://github.com/rust-lang/rust/pull/43011
6080 [43015]: https://github.com/rust-lang/rust/pull/43015
6081 [43072]: https://github.com/rust-lang/rust/pull/43072
6082 [43077]: https://github.com/rust-lang/rust/pull/43077
6083 [43097]: https://github.com/rust-lang/rust/pull/43097
6084 [43099]: https://github.com/rust-lang/rust/pull/43099
6085 [43170]: https://github.com/rust-lang/rust/pull/43170
6086 [43178]: https://github.com/rust-lang/rust/pull/43178
6087 [43185]: https://github.com/rust-lang/rust/pull/43185
6088 [43228]: https://github.com/rust-lang/rust/pull/43228
6089 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
6090 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
6091 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
6092 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
6093 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
6094 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
6095 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
6096 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
6097 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
6098 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
6099 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
6100 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
6101 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
6102 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
6103 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
6104 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
6105 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
6106 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
6107 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
6108 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
6109 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
6110 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
6111 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
6112 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
6113 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
6114 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
6115 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
6116 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
6117 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
6118 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
6119 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
6120 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
6121 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
6122 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
6123 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
6124 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
6125 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
6126 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
6129 Version 1.19.0 (2017-07-20)
6130 ===========================
6135 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
6136 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
6137 - [Macro recursion limit increased to 1024 from 64.][41676]
6138 - [Added lint for detecting unused macros.][41907]
6139 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
6140 For example: `let x = loop { break 7; };`
6141 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
6142 contain `Copy` types and cannot have a `Drop` implementation.
6143 Example: `union Foo { bar: u8, baz: usize }`
6144 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
6145 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
6150 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
6151 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
6152 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
6153 you should use `--target armv7-linux-androideabi`.
6154 - [Fixed ICE when removing a source file between compilation sessions.][41873]
6155 - [Minor optimisation of string operations.][42037]
6156 - [Compiler error message is now `aborting due to previous error(s)` instead of
6157 `aborting due to N previous errors`][42150] This was previously inaccurate and
6158 would only count certain kinds of errors.
6159 - [The compiler now supports Visual Studio 2017][42225]
6160 - [The compiler is now built against LLVM 4.0.1 by default][42948]
6161 - [Added a lot][42264] of [new error codes][42302]
6162 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
6163 libraries with C Run-time Libraries(CRT) to be statically linked.
6164 - [Fixed various ARM codegen bugs][42740]
6169 - [`String` now implements `FromIterator<Cow<'a, str>>` and
6170 `Extend<Cow<'a, str>>`][41449]
6171 - [`Vec` now implements `From<&mut [T]>`][41530]
6172 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
6173 - [`SplitWhitespace` now implements `Clone`][41659]
6174 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
6176 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
6177 macros, but for printing to stderr.
6182 - [`OsString::shrink_to_fit`]
6185 - [`thread::ThreadId`]
6190 - [Build scripts can now add environment variables to the environment
6191 the crate is being compiled in.
6192 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
6193 - [Subcommands now replace the current process rather than spawning a new
6194 child process][cargo/3970]
6195 - [Workspace members can now accept glob file patterns][cargo/3979]
6196 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
6197 the members in a given workspace.][cargo/3988]
6198 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
6199 - [Target directory path is now in the cargo metadata][cargo/4022]
6200 - [Cargo no longer checks out a local working directory for the
6201 crates.io index][cargo/4026] This should provide smaller file size for the
6202 registry, and improve cloning times, especially on Windows machines.
6203 - [Added an `--exclude` option for excluding certain packages when using the
6204 `--all` option][cargo/4031]
6205 - [Cargo will now automatically retry when receiving a 5xx error
6206 from crates.io][cargo/4032]
6207 - [The `--features` option now accepts multiple comma or space
6208 delimited values.][cargo/4084]
6209 - [Added support for custom target specific runners][cargo/3954]
6214 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
6216 - [Rust will now release XZ compressed packages][rust-installer/57]
6217 - [rustup will now prefer to download rust packages with
6218 XZ compression][rustup/1100] over GZip packages.
6219 - [Added the ability to escape `#` in rust documentation][41785] By adding
6220 additional `#`'s ie. `##` is now `#`
6225 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
6226 - [`-Z` flags are now no longer allowed to be used on the stable
6227 compiler.][41751] This has been a warning for a year previous to this.
6228 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
6229 longer works][42844]. Users should migrate to the built-in `check`
6230 command, which has been available since 1.16.
6231 - [Ending a float literal with `._` is now a hard error.
6232 Example: `42._` .][41946]
6233 - [Any use of a private `extern crate` outside of its module is now a
6234 hard error.][36886] This was previously a warning.
6235 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
6236 relative while the `::` prefix makes a path absolute, but was ignored and the
6237 path was relative regardless.
6238 - [Floating point constants in match patterns is now a hard error][36890]
6239 This was previously a warning.
6240 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
6241 match patterns is now a hard error][36891] This was previously a warning.
6242 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
6244 - [From the pound escape, lines consisting of multiple `#`s are
6246 - [It is an error to re-export private enum variants][42460]. This is
6247 known to break a number of crates that depend on an older version of
6249 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
6250 to use it to find the linker, and the build will fail where it did
6251 not previously][42607]
6253 [36886]: https://github.com/rust-lang/rust/issues/36886
6254 [36888]: https://github.com/rust-lang/rust/issues/36888
6255 [36890]: https://github.com/rust-lang/rust/issues/36890
6256 [36891]: https://github.com/rust-lang/rust/issues/36891
6257 [36892]: https://github.com/rust-lang/rust/issues/36892
6258 [37406]: https://github.com/rust-lang/rust/issues/37406
6259 [39983]: https://github.com/rust-lang/rust/pull/39983
6260 [41145]: https://github.com/rust-lang/rust/pull/41145
6261 [41192]: https://github.com/rust-lang/rust/pull/41192
6262 [41258]: https://github.com/rust-lang/rust/pull/41258
6263 [41370]: https://github.com/rust-lang/rust/pull/41370
6264 [41449]: https://github.com/rust-lang/rust/pull/41449
6265 [41530]: https://github.com/rust-lang/rust/pull/41530
6266 [41624]: https://github.com/rust-lang/rust/pull/41624
6267 [41656]: https://github.com/rust-lang/rust/pull/41656
6268 [41659]: https://github.com/rust-lang/rust/pull/41659
6269 [41676]: https://github.com/rust-lang/rust/pull/41676
6270 [41751]: https://github.com/rust-lang/rust/pull/41751
6271 [41764]: https://github.com/rust-lang/rust/pull/41764
6272 [41785]: https://github.com/rust-lang/rust/pull/41785
6273 [41873]: https://github.com/rust-lang/rust/pull/41873
6274 [41907]: https://github.com/rust-lang/rust/pull/41907
6275 [41946]: https://github.com/rust-lang/rust/pull/41946
6276 [42016]: https://github.com/rust-lang/rust/pull/42016
6277 [42037]: https://github.com/rust-lang/rust/pull/42037
6278 [42068]: https://github.com/rust-lang/rust/pull/42068
6279 [42150]: https://github.com/rust-lang/rust/pull/42150
6280 [42162]: https://github.com/rust-lang/rust/pull/42162
6281 [42225]: https://github.com/rust-lang/rust/pull/42225
6282 [42264]: https://github.com/rust-lang/rust/pull/42264
6283 [42302]: https://github.com/rust-lang/rust/pull/42302
6284 [42460]: https://github.com/rust-lang/rust/issues/42460
6285 [42607]: https://github.com/rust-lang/rust/issues/42607
6286 [42740]: https://github.com/rust-lang/rust/pull/42740
6287 [42844]: https://github.com/rust-lang/rust/issues/42844
6288 [42948]: https://github.com/rust-lang/rust/pull/42948
6289 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
6290 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
6291 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
6292 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
6293 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
6294 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
6295 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
6296 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
6297 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
6298 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
6299 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
6300 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
6301 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
6302 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
6303 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
6304 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
6305 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
6306 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
6307 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
6308 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
6309 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
6310 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
6313 Version 1.18.0 (2017-06-08)
6314 ===========================
6319 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
6320 make the item visible to just that module tree. Also accepts the keyword
6321 `crate` to make something public to the whole crate but not users of the
6322 library. Example: `pub(crate) mod utils;`. [RFC 1422].
6323 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
6324 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
6325 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
6326 types like `Write + Send`, trailing `+` are now supported in trait objects,
6327 and better error reporting for trait objects starting with `?Sized`.
6328 - [0e+10 is now a valid floating point literal][40589]
6329 - [Now warns if you bind a lifetime parameter to 'static][40734]
6330 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
6331 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
6332 representation in some cases.][40377]
6337 - [rustc can now emit mir with `--emit mir`][39891]
6338 - [Improved LLVM IR for trivial functions][40367]
6339 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
6340 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
6341 opportunities found through profiling
6342 - [Improved backtrace formatting when panicking][38165]
6347 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
6348 iterator hasn't been advanced the original `Vec` is reassembled with no actual
6349 iteration or reallocation.
6350 - [Simplified HashMap Bucket interface][40561] provides performance
6351 improvements for iterating and cloning.
6352 - [Specialize Vec::from_elem to use calloc][40409]
6353 - [Fixed Race condition in fs::create_dir_all][39799]
6354 - [No longer caching stdio on Windows][40516]
6355 - [Optimized insertion sort in slice][40807] insertion sort in some cases
6356 2.50%~ faster and in one case now 12.50% faster.
6357 - [Optimized `AtomicBool::fetch_nand`][41143]
6362 - [`Child::try_wait`]
6363 - [`HashMap::retain`]
6364 - [`HashSet::retain`]
6366 - [`TcpStream::peek`]
6367 - [`UdpSocket::peek`]
6368 - [`UdpSocket::peek_from`]
6373 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
6374 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
6375 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
6376 - [Added Android build support][cargo/3885]
6377 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
6378 of a certain type, for example `cargo build --bins` will build all
6380 - [Added support for haiku][cargo/3952]
6385 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
6386 - [Rust now uses the official cross compiler for NetBSD][40612]
6387 - [rustdoc now accepts `#` at the start of files][40828]
6388 - [Fixed jemalloc support for musl][41168]
6393 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
6394 always placed after the sign if it exists and before the digits. With the `#`
6395 flag the zeroes are placed after the prefix and before the digits.
6396 - [Due to the struct field optimisation][40377], using `transmute` on structs
6397 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
6398 always been undefined behavior, but is now more likely to break in practice.
6399 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
6400 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
6401 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
6402 - [Overlapping inherent `impl`s are now a hard error][40728]
6403 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
6404 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
6405 `out.asm` and `out.ll` instead of only one of the filetypes.
6406 - [ calling a function that returns `Self` will no longer work][41805] when
6407 the size of `Self` cannot be statically determined.
6408 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
6409 this has caused a few regressions namely:
6411 - Changed the link order of local static/dynamic libraries (respecting the
6412 order on given rather than having the compiler reorder).
6413 - Changed how MinGW is linked, native code linked to dynamic libraries
6414 may require manually linking to the gcc support library (for the native
6417 [38165]: https://github.com/rust-lang/rust/pull/38165
6418 [39799]: https://github.com/rust-lang/rust/pull/39799
6419 [39891]: https://github.com/rust-lang/rust/pull/39891
6420 [40043]: https://github.com/rust-lang/rust/pull/40043
6421 [40241]: https://github.com/rust-lang/rust/pull/40241
6422 [40338]: https://github.com/rust-lang/rust/pull/40338
6423 [40367]: https://github.com/rust-lang/rust/pull/40367
6424 [40377]: https://github.com/rust-lang/rust/pull/40377
6425 [40409]: https://github.com/rust-lang/rust/pull/40409
6426 [40516]: https://github.com/rust-lang/rust/pull/40516
6427 [40556]: https://github.com/rust-lang/rust/pull/40556
6428 [40561]: https://github.com/rust-lang/rust/pull/40561
6429 [40589]: https://github.com/rust-lang/rust/pull/40589
6430 [40612]: https://github.com/rust-lang/rust/pull/40612
6431 [40723]: https://github.com/rust-lang/rust/pull/40723
6432 [40728]: https://github.com/rust-lang/rust/pull/40728
6433 [40731]: https://github.com/rust-lang/rust/pull/40731
6434 [40734]: https://github.com/rust-lang/rust/pull/40734
6435 [40805]: https://github.com/rust-lang/rust/pull/40805
6436 [40807]: https://github.com/rust-lang/rust/pull/40807
6437 [40828]: https://github.com/rust-lang/rust/pull/40828
6438 [40870]: https://github.com/rust-lang/rust/pull/40870
6439 [41085]: https://github.com/rust-lang/rust/pull/41085
6440 [41143]: https://github.com/rust-lang/rust/pull/41143
6441 [41168]: https://github.com/rust-lang/rust/pull/41168
6442 [41270]: https://github.com/rust-lang/rust/issues/41270
6443 [41469]: https://github.com/rust-lang/rust/pull/41469
6444 [41805]: https://github.com/rust-lang/rust/issues/41805
6445 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6446 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6447 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6448 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6449 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6450 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6451 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6452 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6453 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6454 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6455 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6456 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6457 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6458 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6461 Version 1.17.0 (2017-04-27)
6462 ===========================
6467 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6468 * [Fields of structs may be initialized without duplicating the field/variable
6469 names][39761]. [RFC 1682]
6470 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6471 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6472 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6473 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6474 `'b`. Soundness fix.
6475 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6476 * [Static variables may contain references to other statics][40027]
6481 * [Exit quickly on only `--emit dep-info`][40336]
6482 * [Make `-C relocation-model` more correctly determine whether the linker
6483 creates a position-independent executable][40245]
6484 * [Add `-C overflow-checks` to directly control whether integer overflow
6486 * [The rustc type checker now checks items on demand instead of in a single
6487 in-order pass][40008]. This is mostly an internal refactoring in support of
6488 future work, including incremental type checking, but also resolves [RFC
6489 1647], allowing `Self` to appear in `impl` `where` clauses.
6490 * [Optimize vtable loads][39995]
6491 * [Turn off vectorization for Emscripten targets][39990]
6492 * [Provide suggestions for unknown macros imported with `use`][39953]
6493 * [Fix ICEs in path resolution][39939]
6494 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6495 * [Add clearer error message using `&str + &str`][39116]
6506 * [`Ordering::then`]
6507 * [`Ordering::then_with`]
6508 * [`BTreeMap::range`]
6509 * [`BTreeMap::range_mut`]
6510 * [`collections::Bound`]
6511 * [`process::abort`]
6512 * [`ptr::read_unaligned`]
6513 * [`ptr::write_unaligned`]
6514 * [`Result::expect_err`]
6517 * [`Cell::into_inner`]
6523 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6524 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6525 * [`String` implements `FromIterator<&char>`][40028]
6526 * `Box` [implements][40009] a number of new conversions:
6527 `From<Box<str>> for String`,
6528 `From<Box<[T]>> for Vec<T>`,
6529 `From<Box<CStr>> for CString`,
6530 `From<Box<OsStr>> for OsString`,
6531 `From<Box<Path>> for PathBuf`,
6532 `Into<Box<str>> for String`,
6533 `Into<Box<[T]>> for Vec<T>`,
6534 `Into<Box<CStr>> for CString`,
6535 `Into<Box<OsStr>> for OsString`,
6536 `Into<Box<Path>> for PathBuf`,
6537 `Default for Box<str>`,
6538 `Default for Box<CStr>`,
6539 `Default for Box<OsStr>`,
6540 `From<&CStr> for Box<CStr>`,
6541 `From<&OsStr> for Box<OsStr>`,
6542 `From<&Path> for Box<Path>`
6543 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6544 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6545 * [Slightly optimize `slice::sort`][39538]
6546 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6547 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6548 `Box<str>` implements `From<&str>`][39438]
6549 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6550 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6551 * [`format!` estimates the needed capacity before writing a string][39356]
6552 * [Support unprivileged symlink creation in Windows][38921]
6553 * [`PathBuf` implements `Default`][38764]
6554 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6555 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6556 and poor hash functions.
6561 * [Add `cargo check --all`][cargo/3731]
6562 * [Add an option to ignore SSL revocation checking][cargo/3699]
6563 * [Add `cargo run --package`][cargo/3691]
6564 * [Add `required_features`][cargo/3667]
6565 * [Assume `build.rs` is a build script][cargo/3664]
6566 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6571 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6573 * [The "Unstable Book" documents nightly-only features][ubook]
6574 * [Improve the style of the sidebar in rustdoc output][40265]
6575 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6576 * [Fix MSP430 breakage due to `i128`][40257]
6577 * [Preliminary Solaris/SPARCv9 support][39903]
6578 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6579 run without installing the MSVC runtime.
6580 * [`rustdoc --test` includes file names in test names][39788]
6581 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6582 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6583 * [Initial support for `aarch64-unknown-freebsd`][39491]
6584 * [Initial support for `i686-unknown-netbsd`][39426]
6585 * [This release no longer includes the old makefile build system][39431]. Rust
6586 is built with a custom build system, written in Rust, and with Cargo.
6587 * [Add Debug implementations for libcollection structs][39002]
6588 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6589 * [`--test-threads=0` produces an error][38945]
6590 * [`rustup` installs documentation by default][40526]
6591 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6592 WinDbg and Visual Studio to improve the debugging experience.
6597 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6598 workaround, either use MSVC 2015 or run vcvars.bat.
6599 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6600 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6601 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6603 * [`format!` and `Display::to_string` panic if an underlying formatting
6604 implementation returns an error][40117]. Previously the error was silently
6605 ignored. It is incorrect for `write_fmt` to return an error when writing
6607 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6608 crates were marked stable and could be accessed from the stable toolchain.
6609 * [Rust git source no longer includes vendored crates][39728]. Those that need
6610 to build with vendored crates should build from release tarballs.
6611 * [Fix inert attributes from `proc_macro_derives`][39572]
6612 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6613 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6615 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6616 existing code generally ignores the type of dead-code unless a type-hint is
6617 provided; this can cause surprising inference interactions particularly around
6618 defaulting. The new code uniformly ignores the result type of dead-code.
6619 * [Tuple-struct constructors with private fields are no longer visible][38932]
6620 * [Lifetime parameters that do not appear in the arguments are now considered
6621 early-bound][38897], resolving a soundness bug (#[32330]). The
6622 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6624 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6625 * [Make transmuting from fn item types to pointer-sized types a hard
6628 [27787]: https://github.com/rust-lang/rust/issues/27787
6629 [32330]: https://github.com/rust-lang/rust/issues/32330
6630 [34198]: https://github.com/rust-lang/rust/pull/34198
6631 [38161]: https://github.com/rust-lang/rust/pull/38161
6632 [38368]: https://github.com/rust-lang/rust/pull/38368
6633 [38584]: https://github.com/rust-lang/rust/issues/38584
6634 [38661]: https://github.com/rust-lang/rust/pull/38661
6635 [38764]: https://github.com/rust-lang/rust/pull/38764
6636 [38864]: https://github.com/rust-lang/rust/issues/38864
6637 [38897]: https://github.com/rust-lang/rust/pull/38897
6638 [38921]: https://github.com/rust-lang/rust/pull/38921
6639 [38932]: https://github.com/rust-lang/rust/pull/38932
6640 [38945]: https://github.com/rust-lang/rust/pull/38945
6641 [38981]: https://github.com/rust-lang/rust/pull/38981
6642 [39002]: https://github.com/rust-lang/rust/pull/39002
6643 [39116]: https://github.com/rust-lang/rust/pull/39116
6644 [39193]: https://github.com/rust-lang/rust/pull/39193
6645 [39265]: https://github.com/rust-lang/rust/pull/39265
6646 [39356]: https://github.com/rust-lang/rust/pull/39356
6647 [39372]: https://github.com/rust-lang/rust/pull/39372
6648 [39426]: https://github.com/rust-lang/rust/pull/39426
6649 [39431]: https://github.com/rust-lang/rust/pull/39431
6650 [39438]: https://github.com/rust-lang/rust/pull/39438
6651 [39440]: https://github.com/rust-lang/rust/pull/39440
6652 [39485]: https://github.com/rust-lang/rust/pull/39485
6653 [39491]: https://github.com/rust-lang/rust/pull/39491
6654 [39518]: https://github.com/rust-lang/rust/pull/39518
6655 [39538]: https://github.com/rust-lang/rust/pull/39538
6656 [39572]: https://github.com/rust-lang/rust/pull/39572
6657 [39633]: https://github.com/rust-lang/rust/pull/39633
6658 [39642]: https://github.com/rust-lang/rust/pull/39642
6659 [39728]: https://github.com/rust-lang/rust/pull/39728
6660 [39761]: https://github.com/rust-lang/rust/pull/39761
6661 [39788]: https://github.com/rust-lang/rust/pull/39788
6662 [39793]: https://github.com/rust-lang/rust/pull/39793
6663 [39837]: https://github.com/rust-lang/rust/pull/39837
6664 [39843]: https://github.com/rust-lang/rust/pull/39843
6665 [39851]: https://github.com/rust-lang/rust/pull/39851
6666 [39903]: https://github.com/rust-lang/rust/pull/39903
6667 [39939]: https://github.com/rust-lang/rust/pull/39939
6668 [39953]: https://github.com/rust-lang/rust/pull/39953
6669 [39960]: https://github.com/rust-lang/rust/pull/39960
6670 [39990]: https://github.com/rust-lang/rust/pull/39990
6671 [39995]: https://github.com/rust-lang/rust/pull/39995
6672 [40008]: https://github.com/rust-lang/rust/pull/40008
6673 [40009]: https://github.com/rust-lang/rust/pull/40009
6674 [40027]: https://github.com/rust-lang/rust/pull/40027
6675 [40028]: https://github.com/rust-lang/rust/pull/40028
6676 [40037]: https://github.com/rust-lang/rust/pull/40037
6677 [40117]: https://github.com/rust-lang/rust/pull/40117
6678 [40166]: https://github.com/rust-lang/rust/pull/40166
6679 [40245]: https://github.com/rust-lang/rust/pull/40245
6680 [40257]: https://github.com/rust-lang/rust/pull/40257
6681 [40261]: https://github.com/rust-lang/rust/pull/40261
6682 [40265]: https://github.com/rust-lang/rust/pull/40265
6683 [40319]: https://github.com/rust-lang/rust/pull/40319
6684 [40336]: https://github.com/rust-lang/rust/pull/40336
6685 [40526]: https://github.com/rust-lang/rust/pull/40526
6686 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6687 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6688 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6689 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6690 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6691 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6692 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6693 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6694 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6695 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6696 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6697 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6698 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6699 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6700 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6701 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6702 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6703 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6704 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6705 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6706 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6707 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6708 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6709 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6710 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6711 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6712 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6713 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6714 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6715 [ubook]: https://doc.rust-lang.org/unstable-book/
6718 Version 1.16.0 (2017-03-16)
6719 ===========================
6724 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6725 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6726 match patterns][38069]
6727 * [Clean up semantics of `self` in an import list][38313]
6728 * [`Self` may appear in `impl` headers][38920]
6729 * [`Self` may appear in struct expressions][39282]
6734 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6735 a `.rmeta` file containing only crate metadata][38571]. This can be
6736 used by tools like the Rust Language Service to perform
6737 metadata-only builds.
6738 * [Levenshtein based typo suggestions now work in most places, while
6739 previously they worked only for fields and sometimes for local
6740 variables][38927]. Together with the overhaul of "no
6741 resolution"/"unexpected resolution" errors (#[38154]) they result in
6742 large and systematic improvement in resolution diagnostics.
6743 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6745 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6746 * [`rustc` no longer attempts to provide "consider using an explicit
6747 lifetime" suggestions][37057]. They were inaccurate.
6752 * [`VecDeque::truncate`]
6753 * [`VecDeque::resize`]
6754 * [`String::insert_str`]
6755 * [`Duration::checked_add`]
6756 * [`Duration::checked_sub`]
6757 * [`Duration::checked_div`]
6758 * [`Duration::checked_mul`]
6761 * [`SocketAddr::is_ipv4`]
6762 * [`SocketAddr::is_ipv6`]
6763 * [`IpAddr::is_ipv4`]
6764 * [`IpAddr::is_ipv6`]
6766 * [`Vec::dedup_by_key`]
6767 * [`Result::unwrap_or_default`]
6768 * [`<*const T>::wrapping_offset`]
6769 * [`<*mut T>::wrapping_offset`]
6770 * `CommandExt::creation_flags`
6771 * [`File::set_permissions`]
6772 * [`String::split_off`]
6777 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6778 their argument by `Borrow` parameter][37761]
6779 * [All public types in std implement `Debug`][38006]
6780 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6781 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6782 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6784 * [std: Fix partial writes in `LineWriter`][38062]
6785 * [std: Clamp max read/write sizes on Unix][38622]
6786 * [Use more specific panic message for `&str` slicing errors][38066]
6787 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6788 functionality cannot be achieved in std currently.
6789 * [`writeln!`, like `println!`, now accepts a form with no string
6790 or formatting arguments, to just print a newline][38469]
6791 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6792 * [Reduce the size of static data in `std_unicode::tables`][38781]
6793 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6794 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6796 * [`Duration` implements `Sum`][38712]
6797 * [`String` implements `ToSocketAddrs`][39048]
6802 * [The `cargo check` command does a type check of a project without
6803 building it][cargo/3296]
6804 * [crates.io will display CI badges from Travis and AppVeyor, if
6805 specified in Cargo.toml][cargo/3546]
6806 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6807 * [Compilation profiles accept integer values for `debug`, in addition
6808 to `true` and `false`. These are passed to `rustc` as the value to
6809 `-C debuginfo`][cargo/3534]
6810 * [Implement `cargo --version --verbose`][cargo/3604]
6811 * [All builds now output 'dep-info' build dependencies compatible with
6812 make and ninja][cargo/3557]
6813 * [Build all workspace members with `build --all`][cargo/3511]
6814 * [Document all workspace members with `doc --all`][cargo/3515]
6815 * [Path deps outside workspace are not members][cargo/3443]
6820 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6821 the path to the Rust implementation][38589]
6822 * [The `armv7-linux-androideabi` target no longer enables NEON
6823 extensions, per Google's ABI guide][38413]
6824 * [The stock standard library can be compiled for Redox OS][38401]
6825 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6827 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6829 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6834 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6835 match patterns][38069]
6836 * In this release, references to uninhabited types can not be
6837 pattern-matched. This was accidentally allowed in 1.15.
6838 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6839 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6841 * [Clean up semantics of `self` in an import list][38313]
6842 * Reimplemented lifetime elision. This change was almost entirely compatible
6843 with existing code, but it did close a number of small bugs and loopholes,
6844 as well as being more accepting in some other [cases][41105].
6846 [37057]: https://github.com/rust-lang/rust/pull/37057
6847 [37761]: https://github.com/rust-lang/rust/pull/37761
6848 [38006]: https://github.com/rust-lang/rust/pull/38006
6849 [38051]: https://github.com/rust-lang/rust/pull/38051
6850 [38062]: https://github.com/rust-lang/rust/pull/38062
6851 [38622]: https://github.com/rust-lang/rust/pull/38622
6852 [38066]: https://github.com/rust-lang/rust/pull/38066
6853 [38069]: https://github.com/rust-lang/rust/pull/38069
6854 [38131]: https://github.com/rust-lang/rust/pull/38131
6855 [38154]: https://github.com/rust-lang/rust/pull/38154
6856 [38274]: https://github.com/rust-lang/rust/pull/38274
6857 [38304]: https://github.com/rust-lang/rust/pull/38304
6858 [38313]: https://github.com/rust-lang/rust/pull/38313
6859 [38327]: https://github.com/rust-lang/rust/pull/38327
6860 [38401]: https://github.com/rust-lang/rust/pull/38401
6861 [38413]: https://github.com/rust-lang/rust/pull/38413
6862 [38469]: https://github.com/rust-lang/rust/pull/38469
6863 [38559]: https://github.com/rust-lang/rust/pull/38559
6864 [38571]: https://github.com/rust-lang/rust/pull/38571
6865 [38580]: https://github.com/rust-lang/rust/pull/38580
6866 [38589]: https://github.com/rust-lang/rust/pull/38589
6867 [38670]: https://github.com/rust-lang/rust/pull/38670
6868 [38712]: https://github.com/rust-lang/rust/pull/38712
6869 [38726]: https://github.com/rust-lang/rust/pull/38726
6870 [38781]: https://github.com/rust-lang/rust/pull/38781
6871 [38798]: https://github.com/rust-lang/rust/pull/38798
6872 [38909]: https://github.com/rust-lang/rust/pull/38909
6873 [38920]: https://github.com/rust-lang/rust/pull/38920
6874 [38927]: https://github.com/rust-lang/rust/pull/38927
6875 [39048]: https://github.com/rust-lang/rust/pull/39048
6876 [39282]: https://github.com/rust-lang/rust/pull/39282
6877 [39379]: https://github.com/rust-lang/rust/pull/39379
6878 [41105]: https://github.com/rust-lang/rust/issues/41105
6879 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6880 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6881 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6882 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6883 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6884 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6885 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6886 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6887 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6888 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6889 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6890 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6891 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6892 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6893 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6894 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6895 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6896 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6897 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6898 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6899 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6900 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6901 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6902 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6903 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6904 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6905 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6906 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6907 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6910 Version 1.15.1 (2017-02-09)
6911 ===========================
6913 * [Fix IntoIter::as_mut_slice's signature][39466]
6914 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6916 [39466]: https://github.com/rust-lang/rust/pull/39466
6917 [39523]: https://github.com/rust-lang/rust/pull/39523
6920 Version 1.15.0 (2017-02-02)
6921 ===========================
6926 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6927 stable. This allows popular code-generating crates like Serde and Diesel to
6928 work ergonomically. [RFC 1681].
6929 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6930 with curly braces][36868]. Part of [RFC 1506].
6931 * [A number of minor changes to name resolution have been activated][37127].
6932 They add up to more consistent semantics, allowing for future evolution of
6933 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6934 details of what is different. The breaking changes here have been transitioned
6935 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6936 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6938 * [`?Sized` can be used in `where` clauses][37791]
6939 * [There is now a limit on the size of monomorphized types and it can be
6940 modified with the `#![type_size_limit]` crate attribute, similarly to
6941 the `#![recursion_limit]` attribute][37789]
6946 * [On Windows, the compiler will apply dllimport attributes when linking to
6947 extern functions][37973]. Additional attributes and flags can control which
6948 library kind is linked and its name. [RFC 1717].
6949 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6950 * [The `--test` flag works with procedural macro crates][38107]
6951 * [Fix `extern "aapcs" fn` ABI][37814]
6952 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6953 * [The `format!` expander recognizes incorrect `printf` and shell-style
6954 formatting directives and suggests the correct format][37613].
6955 * [Only report one error for all unused imports in an import list][37456]
6957 Compiler Performance
6958 --------------------
6960 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6961 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6962 * [Don't clone in `UnificationTable::probe`][37848]
6963 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6964 * [Use small vectors in type walker][37760]
6965 * [Macro expansion performance was improved][37701]
6966 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6967 * [Replace FNV with a faster hash function][37229]
6972 * [`std::iter::Iterator::min_by`]
6973 * [`std::iter::Iterator::max_by`]
6974 * [`std::os::*::fs::FileExt`]
6975 * [`std::sync::atomic::Atomic*::get_mut`]
6976 * [`std::sync::atomic::Atomic*::into_inner`]
6977 * [`std::vec::IntoIter::as_slice`]
6978 * [`std::vec::IntoIter::as_mut_slice`]
6979 * [`std::sync::mpsc::Receiver::try_iter`]
6980 * [`std::os::unix::process::CommandExt::before_exec`]
6981 * [`std::rc::Rc::strong_count`]
6982 * [`std::rc::Rc::weak_count`]
6983 * [`std::sync::Arc::strong_count`]
6984 * [`std::sync::Arc::weak_count`]
6985 * [`std::char::encode_utf8`]
6986 * [`std::char::encode_utf16`]
6987 * [`std::cell::Ref::clone`]
6988 * [`std::io::Take::into_inner`]
6993 * [The standard sorting algorithm has been rewritten for dramatic performance
6994 improvements][38192]. It is a hybrid merge sort, drawing influences from
6995 Timsort. Previously it was a naive merge sort.
6996 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6997 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6999 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
7000 and `char_indices().last()`][37882]
7001 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
7002 * [Chinese characters display correctly in `fmt::Debug`][37855]
7003 * [Derive `Default` for `Duration`][37699]
7004 * [Support creation of anonymous pipes on WinXP/2k][37677]
7005 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
7006 * [Don't pass overlapped handles to processes][38835]
7011 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7012 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7013 should instead check the variable at runtime with `std::env`. That the value
7014 was set at build time was a bug, and incorrect when cross-compiling. This
7015 change is known to cause breakage.
7016 * [Add `--all` flag to `cargo test`][cargo/3221]
7017 * [Compile statically against the MSVC CRT][cargo/3363]
7018 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
7019 * [Link OpenSSL statically on OSX][cargo/3311]
7020 * [Apply new fingerprinting to build dir outputs][cargo/3310]
7021 * [Test for bad path overrides with summaries][cargo/3336]
7022 * [Require `cargo install --vers` to take a semver version][cargo/3338]
7023 * [Fix retrying crate downloads for network errors][cargo/3348]
7024 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
7025 * [Emit more info on --message-format=json][cargo/3319]
7026 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
7027 * [Don't ignore errors in workspace manifest][cargo/3409]
7028 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
7033 * [Test runners (binaries built with `--test`) now support a `--list` argument
7034 that lists the tests it contains][38185]
7035 * [Test runners now support a `--exact` argument that makes the test filter
7036 match exactly, instead of matching only a substring of the test name][38181]
7037 * [rustdoc supports a `--playground-url` flag][37763]
7038 * [rustdoc provides more details about `#[should_panic]` errors][37749]
7043 * [The Rust build system is now written in Rust][37817]. The Makefiles may
7044 continue to be used in this release by passing `--disable-rustbuild` to the
7045 configure script, but they will be deleted soon. Note that the new build
7046 system uses a different on-disk layout that will likely affect any scripts
7048 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
7050 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
7051 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
7057 * [A number of minor changes to name resolution have been activated][37127].
7058 They add up to more consistent semantics, allowing for future evolution of
7059 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
7060 details of what is different. The breaking changes here have been transitioned
7061 through the [`legacy_imports`] lint since 1.14, with no known regressions.
7062 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
7063 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
7064 should instead check the variable at runtime with `std::env`. That the value
7065 was set at build time was a bug, and incorrect when cross-compiling. This
7066 change is known to cause breakage.
7067 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
7068 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
7069 1.10 and is now an error by default. It will become a hard error in the near
7071 * [The semantics relating modules to file system directories are changing in
7072 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
7073 lint, which is a warning in this release, and will become a hard error in the
7075 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
7076 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
7077 the underlying iterator][37834]
7079 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
7080 [33685]: https://github.com/rust-lang/rust/issues/33685
7081 [36868]: https://github.com/rust-lang/rust/pull/36868
7082 [37127]: https://github.com/rust-lang/rust/pull/37127
7083 [37229]: https://github.com/rust-lang/rust/pull/37229
7084 [37456]: https://github.com/rust-lang/rust/pull/37456
7085 [37527]: https://github.com/rust-lang/rust/pull/37527
7086 [37602]: https://github.com/rust-lang/rust/pull/37602
7087 [37613]: https://github.com/rust-lang/rust/pull/37613
7088 [37615]: https://github.com/rust-lang/rust/pull/37615
7089 [37636]: https://github.com/rust-lang/rust/pull/37636
7090 [37627]: https://github.com/rust-lang/rust/pull/37627
7091 [37642]: https://github.com/rust-lang/rust/pull/37642
7092 [37677]: https://github.com/rust-lang/rust/pull/37677
7093 [37699]: https://github.com/rust-lang/rust/pull/37699
7094 [37701]: https://github.com/rust-lang/rust/pull/37701
7095 [37705]: https://github.com/rust-lang/rust/pull/37705
7096 [37749]: https://github.com/rust-lang/rust/pull/37749
7097 [37760]: https://github.com/rust-lang/rust/pull/37760
7098 [37763]: https://github.com/rust-lang/rust/pull/37763
7099 [37764]: https://github.com/rust-lang/rust/pull/37764
7100 [37789]: https://github.com/rust-lang/rust/pull/37789
7101 [37791]: https://github.com/rust-lang/rust/pull/37791
7102 [37814]: https://github.com/rust-lang/rust/pull/37814
7103 [37817]: https://github.com/rust-lang/rust/pull/37817
7104 [37834]: https://github.com/rust-lang/rust/pull/37834
7105 [37848]: https://github.com/rust-lang/rust/pull/37848
7106 [37855]: https://github.com/rust-lang/rust/pull/37855
7107 [37882]: https://github.com/rust-lang/rust/pull/37882
7108 [37888]: https://github.com/rust-lang/rust/pull/37888
7109 [37973]: https://github.com/rust-lang/rust/pull/37973
7110 [37979]: https://github.com/rust-lang/rust/pull/37979
7111 [38086]: https://github.com/rust-lang/rust/pull/38086
7112 [38107]: https://github.com/rust-lang/rust/pull/38107
7113 [38117]: https://github.com/rust-lang/rust/pull/38117
7114 [38134]: https://github.com/rust-lang/rust/pull/38134
7115 [38146]: https://github.com/rust-lang/rust/pull/38146
7116 [38181]: https://github.com/rust-lang/rust/pull/38181
7117 [38182]: https://github.com/rust-lang/rust/pull/38182
7118 [38185]: https://github.com/rust-lang/rust/pull/38185
7119 [38192]: https://github.com/rust-lang/rust/pull/38192
7120 [38279]: https://github.com/rust-lang/rust/pull/38279
7121 [38835]: https://github.com/rust-lang/rust/pull/38835
7122 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7123 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
7124 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
7125 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
7126 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
7127 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
7128 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
7129 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
7130 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
7131 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
7132 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
7133 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
7134 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
7135 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
7136 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
7137 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
7138 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
7139 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
7140 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
7141 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
7142 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
7143 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
7144 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
7145 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
7146 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
7147 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
7148 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
7149 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
7150 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
7151 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
7152 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
7153 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
7154 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
7155 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
7156 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
7157 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
7158 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
7161 Version 1.14.0 (2016-12-22)
7162 ===========================
7167 * [`..` matches multiple tuple fields in enum variants, structs
7168 and tuples][36843]. [RFC 1492].
7169 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
7170 * [`use *` and `use ::*` both glob-import from the crate root][37367]
7171 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
7172 dereferencing][36822]
7177 * [Mark enums with non-zero discriminant as non-zero][37224]
7178 * [Lower-case `static mut` names are linted like other
7179 statics and consts][37162]
7180 * [Fix ICE on some macros in const integer positions
7181 (e.g. `[u8; m!()]`)][36819]
7182 * [Improve error message and snippet for "did you mean `x`"][36798]
7183 * [Add a panic-strategy field to the target specification][36794]
7184 * [Include LLVM version in `--version --verbose`][37200]
7186 Compile-time Optimizations
7187 --------------------------
7189 * [Improve macro expansion performance][37569]
7190 * [Shrink `Expr_::ExprInlineAsm`][37445]
7191 * [Replace all uses of SHA-256 with BLAKE2b][37439]
7192 * [Reduce the number of bytes hashed by `IchHasher`][37427]
7193 * [Avoid more allocations when compiling html5ever][37373]
7194 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
7195 * [Avoid some allocations in the macro parser][37318]
7196 * [Use a faster deflate setting][37298]
7197 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
7198 during interning of slices][37270]
7199 * [Optimize `write_metadata`][37267]
7200 * [Don't process obligation forest cycles when stalled][37231]
7201 * [Avoid many `CrateConfig` clones][37161]
7202 * [Optimize `Substs::super_fold_with`][37108]
7203 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
7204 * [Speed up `plug_leaks`][36917]
7209 * [`println!()`, with no arguments, prints newline][36825].
7210 Previously, an empty string was required to achieve the same.
7211 * [`Wrapping` impls standard binary and unary operators, as well as
7212 the `Sum` and `Product` iterators][37356]
7213 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
7215 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
7216 `VecDeque` iterators][37315]
7217 * [Improve `SipHasher` performance on small values][37312]
7218 * [Add Iterator trait TrustedLen to enable better FromIterator /
7220 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
7221 * [`ReadDir` implements `Debug`][37221]
7222 * [Implement `RefUnwindSafe` for atomic types][37178]
7223 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
7224 * [Avoid allocations in `Decoder::read_str`][37064]
7225 * [`io::Error` implements `From<io::ErrorKind>`][37037]
7226 * [Impl `Debug` for raw pointers to unsized data][36880]
7227 * [Don't reuse `HashMap` random seeds][37470]
7228 * [The internal memory layout of `HashMap` is more cache-friendly, for
7229 significant improvements in some operations][36692]
7230 * [`HashMap` uses less memory on 32-bit architectures][36595]
7231 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
7236 * [Expose rustc cfg values to build scripts][cargo/3243]
7237 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
7238 * [Fix passing --features when testing multiple packages][cargo/3280]
7239 * [Use a single profile set per workspace][cargo/3249]
7240 * [Load `replace` sections from lock files][cargo/3220]
7241 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
7246 * [rustup is the recommended Rust installation method][1.14rustup]
7247 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
7248 S390x. These are [tier 2] platforms and may have major defects. Follow the
7249 instructions on the website to install, or add the targets to an existing
7250 installation with `rustup target add`. The new target triples are:
7251 - `mips-unknown-linux-gnu`
7252 - `mipsel-unknown-linux-gnu`
7253 - `mips64-unknown-linux-gnuabi64`
7254 - `mips64el-unknown-linux-gnuabi64 `
7255 - `powerpc-unknown-linux-gnu`
7256 - `powerpc64-unknown-linux-gnu`
7257 - `powerpc64le-unknown-linux-gnu`
7258 - `s390x-unknown-linux-gnu `
7259 * This release includes target (std) builds for ARM Linux running MUSL
7260 libc. These are [tier 2] platforms and may have major defects. Add the
7261 following triples to an existing rustup installation with `rustup target add`:
7262 - `arm-unknown-linux-musleabi`
7263 - `arm-unknown-linux-musleabihf`
7264 - `armv7-unknown-linux-musleabihf`
7265 * This release includes [experimental support for WebAssembly][1.14wasm], via
7266 the `wasm32-unknown-emscripten` target. This target is known to have major
7267 defects. Please test, report, and fix.
7268 * rustup no longer installs documentation by default. Run `rustup
7269 component add rust-docs` to install.
7270 * [Fix line stepping in debugger][37310]
7271 * [Enable line number debuginfo in releases][37280]
7276 * [Disable jemalloc on aarch64/powerpc/mips][37392]
7277 * [Add support for Fuchsia OS][37313]
7278 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
7283 * [A number of forward-compatibility lints used by the compiler
7284 to gradually introduce language changes have been converted
7285 to deny by default][36894]:
7286 - ["use of inaccessible extern crate erroneously allowed"][36886]
7287 - ["type parameter default erroneously allowed in invalid location"][36887]
7288 - ["detects super or self keywords at the beginning of global path"][36888]
7289 - ["two overlapping inherent impls define an item with the same name
7290 were erroneously allowed"][36889]
7291 - ["floating-point constants cannot be used in patterns"][36890]
7292 - ["constants of struct or enum type can only be used in a pattern if
7293 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
7294 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
7295 * [Prohibit patterns in trait methods without bodies][37378]
7296 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
7297 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
7298 * [The `$crate` macro variable is accepted in fewer locations][37213]
7299 * [Impls specifying extra region requirements beyond the trait
7300 they implement are rejected][37167]
7301 * [Enums may not be unsized][37111]. Unsized enums are intended to
7302 work but never have. For now they are forbidden.
7303 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
7305 [tier 2]: https://forge.rust-lang.org/platform-support.html
7306 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
7307 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
7308 [36430]: https://github.com/rust-lang/rust/pull/36430
7309 [36595]: https://github.com/rust-lang/rust/pull/36595
7310 [36692]: https://github.com/rust-lang/rust/pull/36692
7311 [36767]: https://github.com/rust-lang/rust/pull/36767
7312 [36794]: https://github.com/rust-lang/rust/pull/36794
7313 [36798]: https://github.com/rust-lang/rust/pull/36798
7314 [36819]: https://github.com/rust-lang/rust/pull/36819
7315 [36822]: https://github.com/rust-lang/rust/pull/36822
7316 [36825]: https://github.com/rust-lang/rust/pull/36825
7317 [36843]: https://github.com/rust-lang/rust/pull/36843
7318 [36880]: https://github.com/rust-lang/rust/pull/36880
7319 [36886]: https://github.com/rust-lang/rust/issues/36886
7320 [36887]: https://github.com/rust-lang/rust/issues/36887
7321 [36888]: https://github.com/rust-lang/rust/issues/36888
7322 [36889]: https://github.com/rust-lang/rust/issues/36889
7323 [36890]: https://github.com/rust-lang/rust/issues/36890
7324 [36891]: https://github.com/rust-lang/rust/issues/36891
7325 [36892]: https://github.com/rust-lang/rust/issues/36892
7326 [36894]: https://github.com/rust-lang/rust/pull/36894
7327 [36917]: https://github.com/rust-lang/rust/pull/36917
7328 [36993]: https://github.com/rust-lang/rust/pull/36993
7329 [37037]: https://github.com/rust-lang/rust/pull/37037
7330 [37064]: https://github.com/rust-lang/rust/pull/37064
7331 [37094]: https://github.com/rust-lang/rust/pull/37094
7332 [37108]: https://github.com/rust-lang/rust/pull/37108
7333 [37111]: https://github.com/rust-lang/rust/pull/37111
7334 [37161]: https://github.com/rust-lang/rust/pull/37161
7335 [37162]: https://github.com/rust-lang/rust/pull/37162
7336 [37167]: https://github.com/rust-lang/rust/pull/37167
7337 [37178]: https://github.com/rust-lang/rust/pull/37178
7338 [37200]: https://github.com/rust-lang/rust/pull/37200
7339 [37213]: https://github.com/rust-lang/rust/pull/37213
7340 [37221]: https://github.com/rust-lang/rust/pull/37221
7341 [37224]: https://github.com/rust-lang/rust/pull/37224
7342 [37230]: https://github.com/rust-lang/rust/pull/37230
7343 [37231]: https://github.com/rust-lang/rust/pull/37231
7344 [37247]: https://github.com/rust-lang/rust/pull/37247
7345 [37267]: https://github.com/rust-lang/rust/pull/37267
7346 [37270]: https://github.com/rust-lang/rust/pull/37270
7347 [37273]: https://github.com/rust-lang/rust/pull/37273
7348 [37280]: https://github.com/rust-lang/rust/pull/37280
7349 [37298]: https://github.com/rust-lang/rust/pull/37298
7350 [37306]: https://github.com/rust-lang/rust/pull/37306
7351 [37310]: https://github.com/rust-lang/rust/pull/37310
7352 [37312]: https://github.com/rust-lang/rust/pull/37312
7353 [37313]: https://github.com/rust-lang/rust/pull/37313
7354 [37315]: https://github.com/rust-lang/rust/pull/37315
7355 [37318]: https://github.com/rust-lang/rust/pull/37318
7356 [37322]: https://github.com/rust-lang/rust/pull/37322
7357 [37326]: https://github.com/rust-lang/rust/pull/37326
7358 [37351]: https://github.com/rust-lang/rust/pull/37351
7359 [37356]: https://github.com/rust-lang/rust/pull/37356
7360 [37367]: https://github.com/rust-lang/rust/pull/37367
7361 [37373]: https://github.com/rust-lang/rust/pull/37373
7362 [37378]: https://github.com/rust-lang/rust/pull/37378
7363 [37389]: https://github.com/rust-lang/rust/pull/37389
7364 [37392]: https://github.com/rust-lang/rust/pull/37392
7365 [37427]: https://github.com/rust-lang/rust/pull/37427
7366 [37439]: https://github.com/rust-lang/rust/pull/37439
7367 [37445]: https://github.com/rust-lang/rust/pull/37445
7368 [37470]: https://github.com/rust-lang/rust/pull/37470
7369 [37569]: https://github.com/rust-lang/rust/pull/37569
7370 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
7371 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
7372 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
7373 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
7374 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
7375 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
7376 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
7379 Version 1.13.0 (2016-11-10)
7380 ===========================
7385 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
7386 errors, like the `try!` macro, described in [RFC 0243].
7387 * [Stabilize macros in type position][36014]. Described in [RFC 873].
7388 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
7389 * [Fix `#[derive]` for empty tuple structs/variants][35728]
7390 * [Fix lifetime rules for 'if' conditions][36029]
7391 * [Avoid loading and parsing unconfigured non-inline modules][36482]
7396 * [Add the `-C link-arg` argument][36574]
7397 * [Remove the old AST-based backend from rustc_trans][35764]
7398 * [Don't enable NEON by default on armv7 Linux][35814]
7399 * [Fix debug line number info for macro expansions][35238]
7400 * [Do not emit "class method" debuginfo for types that are not
7401 DICompositeType][36008]
7402 * [Warn about multiple conflicting #[repr] hints][34623]
7403 * [When sizing DST, don't double-count nested struct prefixes][36351]
7404 * [Default RUST_MIN_STACK to 16MiB for now][36505]
7405 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
7406 * [Reject macros with empty repetitions to avoid infinite loop][36721]
7407 * [Expand macros without recursing to avoid stack overflows][36214]
7412 * [Replace macro backtraces with labeled local uses][35702]
7413 * [Improve error message for misplaced doc comments][33922]
7414 * [Buffer unix and lock windows to prevent message interleaving][35975]
7415 * [Update lifetime errors to specifically note temporaries][36171]
7416 * [Special case a few colors for Windows][36178]
7417 * [Suggest `use self` when such an import resolves][36289]
7418 * [Be more specific when type parameter shadows primitive type][36338]
7419 * Many minor improvements
7421 Compile-time Optimizations
7422 --------------------------
7424 * [Compute and cache HIR hashes at beginning][35854]
7425 * [Don't hash types in loan paths][36004]
7426 * [Cache projections in trans][35761]
7427 * [Optimize the parser's last token handling][36527]
7428 * [Only instantiate #[inline] functions in codegen units referencing
7429 them][36524]. This leads to big improvements in cases where crates export
7430 define many inline functions without using them directly.
7431 * [Lazily allocate TypedArena's first chunk][36592]
7432 * [Don't allocate during default HashSet creation][36734]
7439 * [`overflowing_abs`]
7440 * [`RefCell::try_borrow`]
7441 * [`RefCell::try_borrow_mut`]
7446 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7447 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7449 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7450 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7451 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7452 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7453 * [Use arc4rand on FreeBSD][35884]
7454 * [memrchr: Correct aligned offset computation][35969]
7455 * [Improve Demangling of Rust Symbols][36059]
7456 * [Use monotonic time in condition variables][35048]
7457 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7458 * [Implement conversion traits for `char`][35755]
7459 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7460 * [Zero first byte of CString on drop][36264]
7461 * [Inherit overflow checks for sum and product][36372]
7462 * [Add missing Eq implementations][36423]
7463 * [Implement `Debug` for `DirEntry`][36631]
7464 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7466 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7467 * [Implement more traits for `std::io::ErrorKind`][35911]
7468 * [Optimize BinaryHeap bounds checking][36072]
7469 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7470 `extend_with_element`][36355]
7471 * [Fix overflow checking in unsigned pow()][34942]
7476 * This release includes security fixes to both curl and OpenSSL.
7477 * [Fix transitive doctests when panic=abort][cargo/3021]
7478 * [Add --all-features flag to cargo][cargo/3038]
7479 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7480 * [Don't parse the home directory more than once][cargo/3078]
7481 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7482 * [Update OpenSSL to 1.0.2j][cargo/3121]
7483 * [Add license and license_file to cargo metadata output][cargo/3110]
7484 * [Make crates-io registry URL optional in config; ignore all changes to
7485 source.crates-io][cargo/3089]
7486 * [Don't download dependencies from other platforms][cargo/3123]
7487 * [Build transitive dev-dependencies when needed][cargo/3125]
7488 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7489 * [Avoid updating registry when adding existing deps][cargo/3144]
7490 * [Warn about path overrides that won't work][cargo/3136]
7491 * [Use workspaces during `cargo install`][cargo/3146]
7492 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7493 * [Add --message-format flag][cargo/3000]
7494 * [Pass target environment for rustdoc][cargo/3205]
7495 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7496 * [Update curl and curl-sys][cargo/3241]
7497 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7502 * [rustdoc: Add the `--sysroot` argument][36586]
7503 * [rustdoc: Fix a couple of issues with the search results][35655]
7504 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7505 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7506 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7511 * [Remove unmaintained style guide][35124]
7512 * [Add s390x support][36369]
7513 * [Initial work at Haiku OS support][36727]
7514 * [Add mips-uclibc targets][35734]
7515 * [Crate-ify compiler-rt into compiler-builtins][35021]
7516 * [Add rustc version info (git hash + date) to dist tarball][36213]
7517 * Many documentation improvements
7522 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7523 * [Deny (by default) transmuting from fn item types to pointer-sized
7524 types][34923]. Continuing the long transition to zero-sized fn items,
7526 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7528 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7529 * [Fix lifetime rules for 'if' conditions][36029].
7530 * [Inherit overflow checks for sum and product][36372].
7531 * [Forbid user-defined macros named "macro_rules"][36730].
7533 [33922]: https://github.com/rust-lang/rust/pull/33922
7534 [34623]: https://github.com/rust-lang/rust/pull/34623
7535 [34923]: https://github.com/rust-lang/rust/pull/34923
7536 [34942]: https://github.com/rust-lang/rust/pull/34942
7537 [35021]: https://github.com/rust-lang/rust/pull/35021
7538 [35048]: https://github.com/rust-lang/rust/pull/35048
7539 [35074]: https://github.com/rust-lang/rust/pull/35074
7540 [35124]: https://github.com/rust-lang/rust/pull/35124
7541 [35234]: https://github.com/rust-lang/rust/pull/35234
7542 [35238]: https://github.com/rust-lang/rust/pull/35238
7543 [35354]: https://github.com/rust-lang/rust/pull/35354
7544 [35559]: https://github.com/rust-lang/rust/pull/35559
7545 [35585]: https://github.com/rust-lang/rust/pull/35585
7546 [35627]: https://github.com/rust-lang/rust/pull/35627
7547 [35655]: https://github.com/rust-lang/rust/pull/35655
7548 [35702]: https://github.com/rust-lang/rust/pull/35702
7549 [35707]: https://github.com/rust-lang/rust/pull/35707
7550 [35728]: https://github.com/rust-lang/rust/pull/35728
7551 [35734]: https://github.com/rust-lang/rust/pull/35734
7552 [35755]: https://github.com/rust-lang/rust/pull/35755
7553 [35761]: https://github.com/rust-lang/rust/pull/35761
7554 [35764]: https://github.com/rust-lang/rust/pull/35764
7555 [35814]: https://github.com/rust-lang/rust/pull/35814
7556 [35854]: https://github.com/rust-lang/rust/pull/35854
7557 [35871]: https://github.com/rust-lang/rust/pull/35871
7558 [35884]: https://github.com/rust-lang/rust/pull/35884
7559 [35911]: https://github.com/rust-lang/rust/pull/35911
7560 [35969]: https://github.com/rust-lang/rust/pull/35969
7561 [35975]: https://github.com/rust-lang/rust/pull/35975
7562 [36004]: https://github.com/rust-lang/rust/pull/36004
7563 [36008]: https://github.com/rust-lang/rust/pull/36008
7564 [36014]: https://github.com/rust-lang/rust/pull/36014
7565 [36029]: https://github.com/rust-lang/rust/pull/36029
7566 [36059]: https://github.com/rust-lang/rust/pull/36059
7567 [36072]: https://github.com/rust-lang/rust/pull/36072
7568 [36101]: https://github.com/rust-lang/rust/pull/36101
7569 [36104]: https://github.com/rust-lang/rust/pull/36104
7570 [36171]: https://github.com/rust-lang/rust/pull/36171
7571 [36173]: https://github.com/rust-lang/rust/pull/36173
7572 [36178]: https://github.com/rust-lang/rust/pull/36178
7573 [36213]: https://github.com/rust-lang/rust/pull/36213
7574 [36214]: https://github.com/rust-lang/rust/pull/36214
7575 [36264]: https://github.com/rust-lang/rust/pull/36264
7576 [36266]: https://github.com/rust-lang/rust/pull/36266
7577 [36289]: https://github.com/rust-lang/rust/pull/36289
7578 [36338]: https://github.com/rust-lang/rust/pull/36338
7579 [36351]: https://github.com/rust-lang/rust/pull/36351
7580 [36355]: https://github.com/rust-lang/rust/pull/36355
7581 [36369]: https://github.com/rust-lang/rust/pull/36369
7582 [36372]: https://github.com/rust-lang/rust/pull/36372
7583 [36423]: https://github.com/rust-lang/rust/pull/36423
7584 [36482]: https://github.com/rust-lang/rust/pull/36482
7585 [36505]: https://github.com/rust-lang/rust/pull/36505
7586 [36524]: https://github.com/rust-lang/rust/pull/36524
7587 [36527]: https://github.com/rust-lang/rust/pull/36527
7588 [36551]: https://github.com/rust-lang/rust/pull/36551
7589 [36574]: https://github.com/rust-lang/rust/pull/36574
7590 [36586]: https://github.com/rust-lang/rust/pull/36586
7591 [36592]: https://github.com/rust-lang/rust/pull/36592
7592 [36631]: https://github.com/rust-lang/rust/pull/36631
7593 [36721]: https://github.com/rust-lang/rust/pull/36721
7594 [36727]: https://github.com/rust-lang/rust/pull/36727
7595 [36730]: https://github.com/rust-lang/rust/pull/36730
7596 [36734]: https://github.com/rust-lang/rust/pull/36734
7597 [36754]: https://github.com/rust-lang/rust/pull/36754
7598 [36995]: https://github.com/rust-lang/rust/pull/36995
7599 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7600 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7601 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7602 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7603 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7604 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7605 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7606 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7607 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7608 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7609 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7610 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7611 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7612 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7613 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7614 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7615 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7616 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7617 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7618 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7619 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7620 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7621 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7622 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7623 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7624 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7625 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7626 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7627 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7628 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7629 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7630 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7633 Version 1.12.1 (2016-10-20)
7634 ===========================
7639 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7640 * [Confusion with double negation and booleans][36856]
7641 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7642 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7643 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7644 * [Corrupted memory after updated to 1.12][36936]
7645 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7646 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7647 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7649 [36381]: https://github.com/rust-lang/rust/issues/36381
7650 [36856]: https://github.com/rust-lang/rust/issues/36856
7651 [36875]: https://github.com/rust-lang/rust/issues/36875
7652 [36924]: https://github.com/rust-lang/rust/issues/36924
7653 [36926]: https://github.com/rust-lang/rust/issues/36926
7654 [36936]: https://github.com/rust-lang/rust/issues/36936
7655 [37026]: https://github.com/rust-lang/rust/issues/37026
7656 [37112]: https://github.com/rust-lang/rust/issues/37112
7657 [37153]: https://github.com/rust-lang/rust/issues/37153
7660 Version 1.12.0 (2016-09-29)
7661 ===========================
7666 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7667 This translation pass is far simpler than the previous AST->LLVM pass, and
7668 creates opportunities to perform new optimizations directly on the MIR. It
7669 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7670 * [`rustc` presents a new, more readable error format, along with
7671 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7672 Most common editors supporting Rust have been updated to work with it. It was
7673 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7678 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7679 This translation pass is far simpler than the previous AST->LLVM pass, and
7680 creates opportunities to perform new optimizations directly on the MIR. It
7681 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7682 * [Print the Rust target name, not the LLVM target name, with
7683 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7684 * [The computation of `TypeId` is correct in some cases where it was previously
7685 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7686 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7687 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7688 `--print relocation-models`, and `--print code-models` print the available
7689 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7690 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7691 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7692 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7693 These targets produce statically-linked binaries. There are no binary release
7699 * [`rustc` presents a new, more readable error format, along with
7700 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7701 Most common editors supporting Rust have been updated to work with it. It was
7702 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7703 * [In error descriptions, references are now described in plain English,
7704 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7705 * [In error type descriptions, unknown numeric types are named `{integer}` or
7706 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7707 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7712 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7713 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7714 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7715 useful](https://github.com/rust-lang/rust/pull/34908)
7716 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7717 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7718 * [Semicolons are properly required as statement delimiters inside
7719 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7720 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7725 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7726 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7727 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7728 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7729 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7730 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7731 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7732 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7733 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7734 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7735 Both on Unix and Windows.
7736 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7737 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7738 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7739 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7740 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7741 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7742 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7743 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7748 * [The `format!` macro and friends now allow a single argument to be formatted
7749 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7750 * [The lifetime bounds on `[T]::binary_search_by` and
7751 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7752 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7753 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7754 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7755 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7756 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7757 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7758 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7759 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7760 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7761 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7762 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7763 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7764 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7765 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7766 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7767 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7768 * [`mpsc::sync_channel` `Receiver`s return any available message before
7769 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7770 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7771 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7776 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7777 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7778 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7779 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7780 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7781 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7782 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7783 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7784 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7785 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7786 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7787 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7788 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7789 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7790 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7791 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7796 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7797 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7802 * [Test binaries now support a `--test-threads` argument to specify the number
7803 of threads used to run tests, and which acts the same as the
7804 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7805 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7806 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7807 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7808 * [Rust releases now come with source packages that can be installed by rustup
7809 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7810 The resulting source code can be used by tools and IDES, located in the
7811 sysroot under `lib/rustlib/src`.
7816 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7817 * Many minor improvements to the documentation.
7818 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7823 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7824 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7825 * [When formatting strings, if "precision" is specified, the "fill",
7826 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7827 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7830 Version 1.11.0 (2016-08-18)
7831 ===========================
7836 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7837 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7838 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7839 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7844 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7845 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7846 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7847 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7848 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7849 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7850 (in libcore - previously stabilized in libstd)
7851 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7852 (in libcore - previously stabilized in libstd)
7853 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7854 (in libcore - previously stabilized in libstd)
7855 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7856 (in libcore - previously stabilized in libstd)
7857 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7858 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7859 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7860 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7865 * [The `thread_local!` macro supports multiple definitions in a single
7866 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7867 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7868 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7869 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7870 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7871 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7872 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7873 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7878 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7879 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7880 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7881 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7882 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7883 and `-vv` prints warnings for all crates.
7884 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7885 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7886 This provides room for expansion by arbitrary tools.
7887 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7888 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7889 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7890 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7891 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7892 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7893 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7898 * [Caching projections speeds up type check dramatically for some
7899 workloads](https://github.com/rust-lang/rust/pull/33816)
7900 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7901 This hasher is faster, but is believed to provide sufficient
7902 protection from collision attacks.
7903 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7908 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7909 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7910 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7911 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7912 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7917 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7918 * [When emitting debug info, rustc emits frame pointers for closures,
7919 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7920 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7921 * Many more errors have been given error codes and extended
7923 * API documentation continues to be improved, with many new examples
7928 * [rustc no longer hangs when dependencies recursively re-export
7929 submodules](https://github.com/rust-lang/rust/pull/34542)
7930 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7931 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7932 rewritten](https://github.com/rust-lang/rust/pull/33895)
7933 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7934 No targets use this yet, but it works toward AVR support.
7939 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7940 * [The new follow-set rules that place restrictions on `macro_rules!`
7941 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7942 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7943 and has been a warning since 1.10.
7944 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7945 This causes breakage in some corner cases.
7948 Version 1.10.0 (2016-07-07)
7949 ===========================
7954 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7955 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7956 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7957 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7958 * [`panic!` can be converted to a runtime abort with the
7959 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7960 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7961 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7962 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7963 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7964 Note that Cargo does not yet directly support cdylibs.
7969 * `os::windows::fs::OpenOptionsExt::access_mode`
7970 * `os::windows::fs::OpenOptionsExt::share_mode`
7971 * `os::windows::fs::OpenOptionsExt::custom_flags`
7972 * `os::windows::fs::OpenOptionsExt::attributes`
7973 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7974 * `os::unix::fs::OpenOptionsExt::custom_flags`
7975 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7976 * `Default for sync::Weak`
7977 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7978 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7979 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7980 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7981 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7982 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7983 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7984 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7985 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7986 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7987 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7988 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7989 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7990 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7991 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7992 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7993 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7994 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7995 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7996 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7997 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7998 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7999 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
8000 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
8001 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
8002 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8003 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8004 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
8005 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
8006 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
8007 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
8008 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
8009 * Read/Write/RawFd impls for `UnixStream`
8010 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
8011 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
8012 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
8013 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
8014 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
8015 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
8016 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
8017 * RawFd impls for `UnixListener`
8018 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
8019 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
8020 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
8021 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
8022 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
8023 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
8024 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
8025 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
8026 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
8027 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
8028 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
8029 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
8030 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
8031 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
8032 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
8033 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
8034 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
8035 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
8036 * RawFd impls for `UnixDatagram`
8037 * `{BTree,Hash}Map::values_mut`
8038 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
8043 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
8044 The semantics of this minor method are subtle and probably not what
8046 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
8047 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
8048 will fall back to `/dev/urandom` temporarily to avoid blocking
8049 during early boot](https://github.com/rust-lang/rust/pull/33086).
8050 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
8051 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
8052 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
8053 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
8054 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
8055 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
8056 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
8060 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
8061 This controls the runtime behavior of the `panic!` macro
8062 and can be either "unwind" (the default), or "abort".
8063 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
8064 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
8065 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
8066 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
8067 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
8068 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
8069 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
8070 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
8071 By default they are retried twice, which can be customized with the
8072 `net.retry` value in `.cargo/config`.
8073 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
8074 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
8075 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
8076 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
8077 Makes it possible to install multiple crates in parallel.
8078 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
8079 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
8080 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
8081 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
8082 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
8083 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
8088 * [rustc memory usage was reduced by refactoring the context used for
8089 type checking](https://github.com/rust-lang/rust/pull/33425).
8090 * [Speed up creation of `HashMap`s by caching the random keys used
8091 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
8092 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
8093 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
8094 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
8095 10x faster than the previous lookup tables.
8096 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
8101 * Many incremental improvements to documentation and rustdoc.
8102 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
8103 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
8104 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
8105 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
8106 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
8107 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
8108 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
8113 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
8114 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
8115 * [`std` no longer prints backtraces on platforms where the running
8116 module must be loaded with `env::current_exe`, which can't be relied
8117 on](https://github.com/rust-lang/rust/pull/33554).
8118 * This release includes std binaries for the i586-unknown-linux-gnu,
8119 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
8120 i586 target is for old x86 hardware without SSE2, and the armv7
8121 target is for Android running on modern ARM architectures.
8122 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
8123 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
8124 * [On Unix the runtime aborts by calling `libc::abort` instead of
8125 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
8126 * [Rust is now bootstrapped from the previous release of Rust,
8127 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
8132 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
8133 * [`target_env` for Linux ARM targets is just `gnu`, not
8134 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
8135 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
8136 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
8137 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
8138 Affects how macros are parsed.
8139 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
8140 * [Feature-gated attributes on macro-generated macro invocations are
8141 now rejected](https://github.com/rust-lang/rust/pull/32791).
8142 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
8143 This caused some minor changes to type inference.
8146 Version 1.9.0 (2016-05-26)
8147 ==========================
8152 * The `#[deprecated]` attribute when applied to an API will generate
8153 warnings when used. The warnings may be suppressed with
8154 `#[allow(deprecated)]`. [RFC 1270].
8155 * [`fn` item types are zero sized, and each `fn` names a unique
8156 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8157 `transmute` on a `fn` type will generate a warning for a few cycles,
8158 then will be converted to an error.
8159 * [Field and method resolution understand visibility, so private
8160 fields and methods cannot prevent the proper use of public fields
8161 and methods][1.9fv].
8162 * [The parser considers unicode codepoints in the
8163 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
8169 * [`std::panic::catch_unwind`] (renamed from `recover`)
8170 * [`std::panic::resume_unwind`] (renamed from `propagate`)
8171 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
8172 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
8173 * [`str::is_char_boundary`]
8174 * [`<*const T>::as_ref`]
8175 * [`<*mut T>::as_ref`]
8176 * [`<*mut T>::as_mut`]
8177 * [`AsciiExt::make_ascii_uppercase`]
8178 * [`AsciiExt::make_ascii_lowercase`]
8179 * [`char::decode_utf16`]
8180 * [`char::DecodeUtf16`]
8181 * [`char::DecodeUtf16Error`]
8182 * [`char::DecodeUtf16Error::unpaired_surrogate`]
8183 * [`BTreeSet::take`]
8184 * [`BTreeSet::replace`]
8187 * [`HashSet::replace`]
8189 * [`OsString::with_capacity`]
8190 * [`OsString::clear`]
8191 * [`OsString::capacity`]
8192 * [`OsString::reserve`]
8193 * [`OsString::reserve_exact`]
8194 * [`OsStr::is_empty`]
8196 * [`std::os::unix::thread`]
8199 * [`JoinHandleExt::as_pthread_t`]
8200 * [`JoinHandleExt::into_pthread_t`]
8201 * [`HashSet::hasher`]
8202 * [`HashMap::hasher`]
8203 * [`CommandExt::exec`]
8204 * [`File::try_clone`]
8205 * [`SocketAddr::set_ip`]
8206 * [`SocketAddr::set_port`]
8207 * [`SocketAddrV4::set_ip`]
8208 * [`SocketAddrV4::set_port`]
8209 * [`SocketAddrV6::set_ip`]
8210 * [`SocketAddrV6::set_port`]
8211 * [`SocketAddrV6::set_flowinfo`]
8212 * [`SocketAddrV6::set_scope_id`]
8213 * [`slice::copy_from_slice`]
8214 * [`ptr::read_volatile`]
8215 * [`ptr::write_volatile`]
8216 * [`OpenOptions::create_new`]
8217 * [`TcpStream::set_nodelay`]
8218 * [`TcpStream::nodelay`]
8219 * [`TcpStream::set_ttl`]
8220 * [`TcpStream::ttl`]
8221 * [`TcpStream::set_only_v6`]
8222 * [`TcpStream::only_v6`]
8223 * [`TcpStream::take_error`]
8224 * [`TcpStream::set_nonblocking`]
8225 * [`TcpListener::set_ttl`]
8226 * [`TcpListener::ttl`]
8227 * [`TcpListener::set_only_v6`]
8228 * [`TcpListener::only_v6`]
8229 * [`TcpListener::take_error`]
8230 * [`TcpListener::set_nonblocking`]
8231 * [`UdpSocket::set_broadcast`]
8232 * [`UdpSocket::broadcast`]
8233 * [`UdpSocket::set_multicast_loop_v4`]
8234 * [`UdpSocket::multicast_loop_v4`]
8235 * [`UdpSocket::set_multicast_ttl_v4`]
8236 * [`UdpSocket::multicast_ttl_v4`]
8237 * [`UdpSocket::set_multicast_loop_v6`]
8238 * [`UdpSocket::multicast_loop_v6`]
8239 * [`UdpSocket::set_multicast_ttl_v6`]
8240 * [`UdpSocket::multicast_ttl_v6`]
8241 * [`UdpSocket::set_ttl`]
8242 * [`UdpSocket::ttl`]
8243 * [`UdpSocket::set_only_v6`]
8244 * [`UdpSocket::only_v6`]
8245 * [`UdpSocket::join_multicast_v4`]
8246 * [`UdpSocket::join_multicast_v6`]
8247 * [`UdpSocket::leave_multicast_v4`]
8248 * [`UdpSocket::leave_multicast_v6`]
8249 * [`UdpSocket::take_error`]
8250 * [`UdpSocket::connect`]
8251 * [`UdpSocket::send`]
8252 * [`UdpSocket::recv`]
8253 * [`UdpSocket::set_nonblocking`]
8258 * [`std::sync::Once` is poisoned if its initialization function
8260 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
8261 * [Most types implement `fmt::Debug`][1.9db].
8262 * [The default buffer size used by `BufReader` and `BufWriter` was
8263 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
8264 used by other languages.
8265 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
8266 `Duration` additionally implements `*=` and `/=`][1.9ta].
8267 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
8268 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
8269 * [`Chain` implements `BufRead`][1.9ch].
8270 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
8275 * [Cargo can now run concurrently][1.9cc].
8276 * [Top-level overrides allow specific revisions of crates to be
8277 overridden through the entire crate graph][1.9ct]. This is intended
8278 to make upgrades easier for large projects, by allowing crates to be
8279 forked temporarily until they've been upgraded and republished.
8280 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
8281 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
8282 on the commandline][1.9cf]. `rustc` arguments can also be specified
8283 in the `build.rustflags` configuration key.
8288 * [The time complexity of comparing variables for equivalence during type
8289 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
8290 to major compilation time improvement in some scenarios.
8291 * [`ToString` is specialized for `str`, giving it the same performance
8292 as `to_owned`][1.9ts].
8293 * [Spawning processes with `Command::output` no longer creates extra
8295 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
8296 for C-like enums][1.9cl].
8301 * [Passing the `--quiet` flag to a test runner will produce
8302 much-abbreviated output][1.9q].
8303 * The Rust Project now publishes std binaries for the
8304 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
8305 `i586-pc-windows-msvc` targets.
8310 * [`std::sync::Once` is poisoned if its initialization function
8312 * [It is illegal to define methods with the same name in overlapping
8313 inherent `impl` blocks][1.9sn].
8314 * [`fn` item types are zero sized, and each `fn` names a unique
8315 type][1.9fn]. This will break code that transmutes `fn`s, so calling
8316 `transmute` on a `fn` type will generate a warning for a few cycles,
8317 then will be converted to an error.
8318 * [Improvements to const evaluation may trigger new errors when integer
8319 literals are out of range][1.9ce].
8322 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
8323 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
8324 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
8325 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
8326 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
8327 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
8328 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
8329 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
8330 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
8331 [1.9db]: https://github.com/rust-lang/rust/pull/32054
8332 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
8333 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
8334 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
8335 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
8336 [1.9o]: https://github.com/rust-lang/rust/pull/32325
8337 [1.9q]: https://github.com/rust-lang/rust/pull/31887
8338 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
8339 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
8340 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
8341 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
8342 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
8343 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
8344 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
8345 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
8346 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8347 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
8348 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
8349 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
8350 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
8351 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
8352 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
8353 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
8354 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
8355 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
8356 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
8357 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
8358 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
8359 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
8360 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
8361 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
8362 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
8363 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
8364 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
8365 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
8366 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
8367 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
8368 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
8369 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
8370 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
8371 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
8372 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
8373 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
8374 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
8375 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
8376 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
8377 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
8378 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
8379 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
8380 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
8381 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
8382 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8383 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8384 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8385 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8386 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8387 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8388 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
8389 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
8390 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
8391 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
8392 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
8393 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
8394 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
8395 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
8396 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
8397 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
8398 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
8399 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
8400 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
8401 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
8402 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
8403 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
8404 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
8405 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
8406 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
8407 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
8408 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
8409 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
8410 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
8411 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
8412 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
8413 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
8414 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
8415 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
8416 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
8417 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
8418 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
8419 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
8420 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
8421 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
8422 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
8423 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8424 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8425 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8426 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8427 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8428 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8429 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8430 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8431 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8434 Version 1.8.0 (2016-04-14)
8435 ==========================
8440 * Rust supports overloading of compound assignment statements like
8441 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8442 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8443 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8445 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8446 addition to the non-braced form, `struct Foo;`. [RFC 218].
8452 * [`str::encode_utf16`] (renamed from `utf16_units`)
8453 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8456 * [`ptr::drop_in_place`]
8458 * [`time::SystemTime`]
8460 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8461 * [`Instant::elapsed`]
8462 * [`SystemTime::now`]
8463 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8464 * [`SystemTime::elapsed`]
8465 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8466 * [`SystemTimeError`]
8467 * [`SystemTimeError::duration`]
8468 * Various impls for `SystemTimeError`
8470 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8471 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8472 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8473 * [The `write!` and `writeln!` macros correctly emit errors if any of
8474 their arguments can't be formatted][1.8w].
8475 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8476 * [The Unix-specific `raw` modules, which contain a number of
8477 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8478 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8479 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8480 across platforms was making it difficult to implement `std`
8481 correctly. Those that need these definitions should use the `libc`
8483 * The Unix-specific `MetadataExt` traits, including
8484 `os::unix::fs::MetadataExt`, which expose values such as inode
8485 numbers [no longer return platform-specific types][1.8r], but
8486 instead return widened integers. [RFC 1415].
8487 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8488 * [Atomic loads and stores are not volatile][1.8a].
8489 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8494 * [Inlining hash functions lead to a 3% compile-time improvement in
8495 some workloads][1.8h].
8496 * When using jemalloc, its symbols are [unprefixed so that it
8497 overrides the libc malloc implementation][1.8h]. This means that for
8498 rustc, LLVM is now using jemalloc, which results in a 6%
8499 compile-time improvement on a specific workload.
8500 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8505 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8506 i686-pc-windows-msvc is now considered a tier-1 platform.
8507 * [The `--print targets` flag prints a list of supported targets][1.8t].
8508 * [The `--print cfg` flag prints the `cfg`s defined for the current
8510 * [`rustc` can be built with an new Cargo-based build system, written
8511 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8512 build system. To enable it configure with `configure --rustbuild`.
8513 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8514 variants while also indicating the total number of missing variants
8515 if more than 3][1.8m].
8516 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8517 * The Rust Project now publishes binary releases of the standard
8518 library for a number of tier-2 targets:
8519 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8520 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8521 `x86_64-rumprun-netbsd`. These can be installed with
8522 tools such as [multirust][1.8mr].
8527 * [`cargo init` creates a new Cargo project in the current
8528 directory][1.8ci]. It is otherwise like `cargo new`.
8529 * [Cargo has configuration keys for `-v` and
8530 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8531 `[term]` section of `.cargo/config`.
8532 * [Configuration keys that evaluate to strings or integers can be set
8533 via environment variables][1.8ce]. For example the `build.jobs` key
8534 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8535 precedence over config files.
8536 * [Target-specific dependencies support Rust `cfg` syntax for
8537 describing targets][1.8cfg] so that dependencies for multiple
8538 targets can be specified together. [RFC 1361].
8539 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8540 `RUSTDOC` take precedence over the `build.target-dir`,
8541 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8542 * [The child process tree is killed on Windows when Cargo is
8544 * [The `build.target` configuration value sets the target platform,
8545 like `--target`][1.8ct].
8550 * [Unstable compiler flags have been further restricted][1.8u]. Since
8551 1.0 `-Z` flags have been considered unstable, and other flags that
8552 were considered unstable additionally required passing `-Z
8553 unstable-options` to access. Unlike unstable language and library
8554 features though, these options have been accessible on the stable
8555 release channel. Going forward, *new unstable flags will not be
8556 available on the stable release channel*, and old unstable flags
8557 will warn about their usage. In the future, all unstable flags will
8558 be unavailable on the stable release channel.
8559 * [It is no longer possible to `match` on empty enum variants using
8560 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8561 * The Unix-specific `MetadataExt` traits, including
8562 `os::unix::fs::MetadataExt`, which expose values such as inode
8563 numbers [no longer return platform-specific types][1.8r], but
8564 instead return widened integers. [RFC 1415].
8565 * [Modules sourced from the filesystem cannot appear within arbitrary
8566 blocks, but only within other modules][1.8mf].
8567 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8568 * On Unix, [stack overflow triggers a runtime abort instead of a
8570 * [`Command::spawn` and its equivalents return an error if any of
8571 its command-line arguments contain interior `NUL`s][1.8n].
8572 * [Tuple and unit enum variants from other crates are in the type
8574 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8575 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8576 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8577 instead of `foo.lib`.
8580 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8581 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8582 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8583 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8584 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8585 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8586 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8587 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8588 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8589 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8590 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8591 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8592 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8593 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8594 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8595 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8596 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8597 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8598 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8599 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8600 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8601 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8602 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8603 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8604 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8605 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8606 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8607 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8608 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8609 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8610 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8611 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8612 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8613 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8614 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8615 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8616 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8617 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8618 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8619 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8620 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8621 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8622 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8623 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8624 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8625 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8626 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8627 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8628 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8629 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8630 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8631 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8632 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8633 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8634 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8635 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8636 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8637 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8638 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8639 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8642 Version 1.7.0 (2016-03-03)
8643 ==========================
8650 * [`Path::strip_prefix`] (renamed from relative_from)
8651 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8653 * [`Ipv4Addr::is_loopback`]
8654 * [`Ipv4Addr::is_private`]
8655 * [`Ipv4Addr::is_link_local`]
8656 * [`Ipv4Addr::is_multicast`]
8657 * [`Ipv4Addr::is_broadcast`]
8658 * [`Ipv4Addr::is_documentation`]
8660 * [`Ipv6Addr::is_unspecified`]
8661 * [`Ipv6Addr::is_loopback`]
8662 * [`Ipv6Addr::is_multicast`]
8665 * [`Vec::as_mut_slice`]
8667 * [`String::as_str`]
8668 * [`String::as_mut_str`]
8670 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8672 * `<[T]>::`[`sort_by_key`]
8673 * checked, saturated, and overflowing operations
8674 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8675 * [`i32::saturating_mul`]
8676 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8677 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8678 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8679 * [`u32::saturating_mul`]
8680 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8681 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8682 * and checked, saturated, and overflowing operations for other primitive types
8684 * [`ffi::IntoStringError`]
8685 * [`CString::into_string`]
8686 * [`CString::into_bytes`]
8687 * [`CString::into_bytes_with_nul`]
8688 * `From<CString> for Vec<u8>`
8690 * [`IntoStringError::into_cstring`]
8691 * [`IntoStringError::utf8_error`]
8692 * `Error for IntoStringError`
8694 * [`std::hash::BuildHasher`]
8695 * [`BuildHasher::Hasher`]
8696 * [`BuildHasher::build_hasher`]
8697 * [`std::hash::BuildHasherDefault`]
8698 * [`HashMap::with_hasher`]
8699 * [`HashMap::with_capacity_and_hasher`]
8700 * [`HashSet::with_hasher`]
8701 * [`HashSet::with_capacity_and_hasher`]
8702 * [`std::collections::hash_map::RandomState`]
8703 * [`RandomState::new`]
8704 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8705 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8706 from bytes is faster.
8707 * [The performance of `LineWriter` (and thus `io::stdout`) was
8708 improved by using `memchr` to search for newlines][1.7m].
8709 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8710 `f64` variants were stabilized previously.
8711 * [`BTreeMap` was rewritten to use less memory and improve the performance
8712 of insertion and iteration, the latter by as much as 5x][1.7bm].
8713 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8714 covariant over their contained type][1.7bt].
8715 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8716 over their contained type][1.7ll].
8717 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8719 * [`Any` is implemented for unsized types][1.7a].
8720 * [`Hash` is implemented for `Duration`][1.7h].
8725 * [When running tests with `--test`, rustdoc will pass `--cfg`
8726 arguments to the compiler][1.7dt].
8727 * [The compiler is built with RPATH information by default][1.7rpa].
8728 This means that it will be possible to run `rustc` when installed in
8729 unusual configurations without configuring the dynamic linker search
8731 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8732 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8733 over `LD_LIBRARY_PATH`.
8738 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8739 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8740 * [The `rerun-if-changed` build script directive no longer causes the
8741 build script to incorrectly run twice in certain scenarios][1.7rr].
8746 * Soundness fixes to the interactions between associated types and
8747 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8748 code that violates the new rules. This is a significant change that
8749 is known to break existing code, so it has emitted warnings for the
8750 new error cases since 1.4 to give crate authors time to adapt. The
8751 details of what is changing are subtle; read the RFC for more.
8752 * [Several bugs in the compiler's visibility calculations were
8753 fixed][1.7v]. Since this was found to break significant amounts of
8754 code, the new errors will be emitted as warnings for several release
8755 cycles, under the `private_in_public` lint.
8756 * Defaulted type parameters were accidentally accepted in positions
8757 that were not intended. In this release, [defaulted type parameters
8758 appearing outside of type definitions will generate a
8759 warning][1.7d], which will become an error in future releases.
8760 * [Parsing "." as a float results in an error instead of 0][1.7p].
8761 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8762 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8764 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8765 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8766 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8767 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8768 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8769 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8770 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8771 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8772 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8773 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8774 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8775 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8776 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8777 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8778 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8779 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8780 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8781 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8782 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8783 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8784 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8785 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8786 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8787 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8788 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8789 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8790 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8791 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8792 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8793 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8794 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8795 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8796 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8797 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8798 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8799 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8800 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8801 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8802 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8803 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8804 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8805 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8806 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8807 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8808 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8809 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8810 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8811 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8812 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8813 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8814 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8815 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8816 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8817 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8818 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8819 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8820 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8821 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8822 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8823 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8824 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8825 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8826 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8827 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8828 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8829 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8830 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8831 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8832 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8833 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8834 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8835 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8836 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8837 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8838 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8839 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8840 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8841 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8842 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8845 Version 1.6.0 (2016-01-21)
8846 ==========================
8851 * The `#![no_std]` attribute causes a crate to not be linked to the
8852 standard library, but only the [core library][1.6co], as described
8853 in [RFC 1184]. The core library defines common types and traits but
8854 has no platform dependencies whatsoever, and is the basis for Rust
8855 software in environments that cannot support a full port of the
8856 standard library, such as operating systems. Most of the core
8857 library is now stable.
8863 [`Read::read_exact`],
8864 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8865 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8866 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8867 [`os::unix::fs::DirBuilderExt`],
8868 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8869 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8870 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8871 [`collections::hash_map::Drain`],
8872 [`collections::hash_map::HashMap::drain`],
8873 [`collections::hash_set::Drain`],
8874 [`collections::hash_set::HashSet::drain`],
8875 [`collections::binary_heap::Drain`],
8876 [`collections::binary_heap::BinaryHeap::drain`],
8877 [`Vec::extend_from_slice`] (renamed from `push_all`),
8878 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8879 [`RwLock::into_inner`],
8880 [`Iterator::min_by_key`] (renamed from `min_by`),
8881 [`Iterator::max_by_key`] (renamed from `max_by`).
8882 * The [core library][1.6co] is stable, as are most of its APIs.
8883 * [The `assert_eq!` macro supports arguments that don't implement
8884 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8886 * Several timer functions that take duration in milliseconds [are
8887 deprecated in favor of those that take `Duration`][1.6ms]. These
8888 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8889 `thread::park_timeout_ms`.
8890 * The algorithm by which `Vec` reserves additional elements was
8891 [tweaked to not allocate excessive space][1.6a] while still growing
8893 * `From` conversions are [implemented from integers to floats][1.6f]
8894 in cases where the conversion is lossless. Thus they are not
8895 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8896 or `f64`. They are also not implemented for `isize` and `usize`
8897 because the implementations would be platform-specific. `From` is
8898 also implemented from `f32` to `f64`.
8899 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8900 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8901 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8902 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8904 * Sorting slices that are already sorted [is 50% faster in some
8910 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8911 * Cargo build scripts can specify their dependencies by emitting the
8912 [`rerun-if-changed`][1.6rr] key.
8913 * crates.io will reject publication of crates with dependencies that
8914 have a wildcard version constraint. Crates with wildcard
8915 dependencies were seen to cause a variety of problems, as described
8916 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8918 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8919 release folder. A variety of artifacts that Cargo failed to clean
8920 are now correctly deleted.
8925 * The `unreachable_code` lint [warns when a function call's argument
8927 * The parser indicates [failures that may be caused by
8928 confusingly-similar Unicode characters][1.6uc]
8929 * Certain macro errors [are reported at definition time][1.6m], not
8935 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8936 environment variable when locating crates. This was a pre-cargo
8937 feature for integrating with the package manager that was
8938 accidentally never removed.
8939 * [A number of bugs were fixed in the privacy checker][1.6p] that
8940 could cause previously-accepted code to break.
8941 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8942 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8943 struct pattern syntax (`Foo(..)`) can no longer be used to match
8944 unit structs. This is a warning now, but will become an error in
8945 future releases. Patterns that share the same name as a const are
8947 * A bug was fixed that causes [rustc not to apply default type
8948 parameters][1.6xc] when resolving certain method implementations of
8949 traits defined in other crates.
8951 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8952 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8953 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8954 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8955 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8956 [1.6co]: http://doc.rust-lang.org/core/index.html
8957 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8958 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8959 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8960 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8961 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8962 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8963 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8964 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8965 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8966 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8967 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8968 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8969 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8970 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8971 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8972 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8973 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8974 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8975 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8976 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8977 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8978 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8979 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8980 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8981 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8982 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8983 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8984 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8985 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8986 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8987 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8988 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8989 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8990 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8991 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8992 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8993 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8994 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8995 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8996 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8997 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
9000 Version 1.5.0 (2015-12-10)
9001 ==========================
9003 * ~700 changes, numerous bugfixes
9009 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
9010 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
9011 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
9012 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
9013 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
9014 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
9015 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
9016 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
9017 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
9018 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
9019 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
9020 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
9021 [`Path::read_link`], [`Path::symlink_metadata`],
9022 [`Utf8Error::valid_up_to`], [`Vec::resize`],
9023 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
9024 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
9025 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
9026 [`slice::split_first_mut`], [`slice::split_first`],
9027 [`slice::split_last_mut`], [`slice::split_last`],
9028 [`char::from_u32_unchecked`], [`fs::canonicalize`],
9029 [`str::MatchIndices`], [`str::RMatchIndices`],
9030 [`str::match_indices`], [`str::rmatch_indices`],
9031 [`str::slice_mut_unchecked`], [`string::ParseError`].
9032 * Rust applications hosted on crates.io can be installed locally to
9033 `~/.cargo/bin` with the [`cargo install`] command. Among other
9034 things this makes it easier to augment Cargo with new subcommands:
9035 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
9036 invoked as `cargo foo`.
9037 * Crates with wildcard (`*`) dependencies will [emit warnings when
9038 published][1.5w]. In 1.6 it will no longer be possible to publish
9039 crates with wildcard dependencies.
9044 * The rules determining when a particular lifetime must outlive
9045 a particular value (known as '[dropck]') have been [modified
9046 to not rely on parametricity][1.5p].
9047 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
9048 and `Arc`][1.5a]. Because these smart pointer types implement
9049 `Deref`, this causes breakage in cases where the interior type
9050 contains methods of the same name.
9051 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
9052 that they could drop their content. Soundness fix.
9053 * All method invocations are [properly checked][1.5wf1] for
9054 [well-formedness][1.5wf2]. Soundness fix.
9055 * Traits whose supertraits contain `Self` are [not object
9056 safe][1.5o]. Soundness fix.
9057 * Target specifications support a [`no_default_libraries`][1.5nd]
9058 setting that controls whether `-nodefaultlibs` is passed to the
9059 linker, and in turn the `is_like_windows` setting no longer affects
9060 the `-nodefaultlibs` flag.
9061 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
9062 * The `#[inline]` and `#[repr]` attributes [can only appear
9063 in valid locations][1.5at].
9064 * Native libraries linked from the local crate are [passed to
9065 the linker before native libraries from upstream crates][1.5nl].
9066 * Two rarely-used attributes, `#[no_debug]` and
9067 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
9068 * Negation of unsigned integers, which has been a warning for
9069 several releases, [is now behind a feature gate and will
9070 generate errors][1.5nu].
9071 * The parser accidentally accepted visibility modifiers on
9072 enum variants, a bug [which has been fixed][1.5ev].
9073 * [A bug was fixed that allowed `use` statements to import unstable
9079 * When evaluating expressions at compile-time that are not
9080 compile-time constants (const-evaluating expressions in non-const
9081 contexts), incorrect code such as overlong bitshifts and arithmetic
9082 overflow will [generate a warning instead of an error][1.5ce],
9083 delaying the error until runtime. This will allow the
9084 const-evaluator to be expanded in the future backwards-compatibly.
9085 * The `improper_ctypes` lint [no longer warns about using `isize` and
9086 `usize` in FFI][1.5ict].
9091 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
9093 * `Default` is [implemented for mutable slices][1.5d].
9094 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
9095 * There are now `From` conversions [between floating point
9096 types][1.5f] where the conversions are lossless.
9097 * There are now `From` conversions [between integer types][1.5i] where
9098 the conversions are lossless.
9099 * [`fs::Metadata` implements `Clone`][1.5fs].
9100 * The `parse` method [accepts a leading "+" when parsing
9102 * [`AsMut` is implemented for `Vec`][1.5am].
9103 * The `clone_from` implementations for `String` and `BinaryHeap` [have
9104 been optimized][1.5cf] and no longer rely on the default impl.
9105 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
9106 `unsafe extern "C"` function types now [implement `Clone`,
9107 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
9108 `fmt::Debug` for up to 12 arguments][1.5fp].
9109 * [Dropping `Vec`s is much faster in unoptimized builds when the
9110 element types don't implement `Drop`][1.5dv].
9111 * A bug that caused in incorrect behavior when [combining `VecDeque`
9112 with zero-sized types][1.5vdz] was resolved.
9113 * [`PartialOrd` for slices is faster][1.5po].
9118 * [Crate metadata size was reduced by 20%][1.5md].
9119 * [Improvements to code generation reduced the size of libcore by 3.3
9120 MB and rustc's memory usage by 18MB][1.5m].
9121 * [Improvements to deref translation increased performance in
9122 unoptimized builds][1.5dr].
9123 * Various errors in trait resolution [are deduplicated to only be
9124 reported once][1.5te].
9125 * Rust has preliminary [support for rumprun kernels][1.5rr].
9126 * Rust has preliminary [support for NetBSD on amd64][1.5na].
9128 [1.5use]: https://github.com/rust-lang/rust/pull/28364
9129 [1.5po]: https://github.com/rust-lang/rust/pull/28436
9130 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
9131 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
9132 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
9133 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
9134 [1.5md]: https://github.com/rust-lang/rust/pull/28521
9135 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
9136 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
9137 [1.5na]: https://github.com/rust-lang/rust/pull/28543
9138 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
9139 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
9140 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
9141 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
9142 [1.5te]: https://github.com/rust-lang/rust/pull/28645
9143 [1.5at]: https://github.com/rust-lang/rust/pull/28650
9144 [1.5am]: https://github.com/rust-lang/rust/pull/28663
9145 [1.5m]: https://github.com/rust-lang/rust/pull/28778
9146 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
9147 [1.5a]: https://github.com/rust-lang/rust/pull/28811
9148 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
9149 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
9150 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
9151 [1.5i]: https://github.com/rust-lang/rust/pull/28921
9152 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
9153 [1.5f]: https://github.com/rust-lang/rust/pull/29129
9154 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
9155 [1.5s]: https://github.com/rust-lang/rust/pull/29190
9156 [1.5d]: https://github.com/rust-lang/rust/pull/29245
9157 [1.5o]: https://github.com/rust-lang/rust/pull/29259
9158 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
9159 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9160 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
9161 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
9162 [1.5c]: https://github.com/rust-lang/rust/pull/29110
9163 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
9164 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
9165 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
9166 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
9167 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
9168 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
9169 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
9170 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
9171 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
9172 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
9173 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
9174 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
9175 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
9176 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
9177 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
9178 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
9179 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
9180 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
9181 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
9182 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
9183 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
9184 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
9185 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
9186 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
9187 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
9188 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
9189 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
9190 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
9191 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
9192 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
9193 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
9194 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
9195 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
9196 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
9197 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
9198 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
9199 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
9200 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
9201 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
9202 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
9203 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
9204 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
9205 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
9206 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
9207 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
9208 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
9209 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
9210 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
9211 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
9212 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
9213 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
9214 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
9215 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
9216 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
9218 Version 1.4.0 (2015-10-29)
9219 ==========================
9221 * ~1200 changes, numerous bugfixes
9226 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
9227 GNU) are now supported and recommended for use.
9232 * [Several changes have been made to fix type soundness and improve
9233 the behavior of associated types][sound]. See [RFC 1214]. Although
9234 we have mostly introduced these changes as warnings this release, to
9235 become errors next release, there are still some scenarios that will
9236 see immediate breakage.
9237 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
9238 line breaks in addition to `\n`][crlf].
9239 * [Loans of `'static` lifetime extend to the end of a function][stat].
9240 * [`str::parse` no longer introduces avoidable rounding error when
9241 parsing floating point numbers. Together with earlier changes to
9242 float formatting/output, "round trips" like f.to_string().parse()
9243 now preserve the value of f exactly. Additionally, leading plus
9244 signs are now accepted][fp3].
9250 * `use` statements that import multiple items [can now rename
9251 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
9252 * [Binops work correctly on fat pointers][binfat].
9253 * `pub extern crate`, which does not behave as expected, [issues a
9254 warning][pec] until a better solution is found.
9259 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
9260 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
9261 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
9262 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
9263 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
9264 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
9265 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
9266 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
9267 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
9268 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
9269 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
9270 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
9271 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
9272 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
9273 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
9274 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
9275 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
9276 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
9278 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
9279 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
9280 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
9281 `f64::from_str_radix`.
9282 * [Reverse-searching strings is faster with the 'two-way'
9284 * [`std::io::copy` allows `?Sized` arguments][cc].
9285 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
9286 [override `count`, `nth` and `last` with an *O*(1)
9287 implementation][it].
9288 * [`Default` is implemented for arrays up to `[T; 32]`][d].
9289 * [`IntoRawFd` has been added to the Unix-specific prelude,
9290 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
9292 * [`Extend<String>` and `FromIterator<String` are both implemented for
9294 * [`IntoIterator` is implemented for references to `Option` and
9296 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
9297 Copy`][ext] as part of [RFC 839]. This will cause type inference
9298 breakage in rare situations.
9299 * [`BinaryHeap` implements `Debug`][bh2].
9300 * [`Borrow` and `BorrowMut` are implemented for fixed-size
9302 * [`extern fn`s with the "Rust" and "C" ABIs implement common
9303 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
9304 * [String comparison is faster][faststr].
9305 * `&mut T` where `T: std::fmt::Write` [also implements
9306 `std::fmt::Write`][mutw].
9307 * [A stable regression in `VecDeque::push_back` and other
9308 capacity-altering methods that caused panics for zero-sized types
9310 * [Function pointers implement traits for up to 12 parameters][fp2].
9315 * The compiler [no longer uses the 'morestack' feature to prevent
9316 stack overflow][mm]. Instead it uses guard pages and stack
9317 probes (though stack probes are not yet implemented on any platform
9319 * [The compiler matches traits faster when projections are involved][p].
9320 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
9322 * [Cargo now displays useful information about what its doing during
9323 `cargo update`][cu].
9325 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
9326 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
9327 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
9328 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
9329 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
9330 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
9331 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
9332 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
9333 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
9334 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
9335 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
9336 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
9337 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
9338 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
9339 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
9340 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
9341 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
9342 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
9343 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9344 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9345 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9346 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9347 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
9348 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
9349 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
9350 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
9351 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
9352 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
9353 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
9354 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
9355 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
9356 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
9357 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
9358 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
9359 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
9360 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
9361 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
9362 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
9363 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
9364 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
9365 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
9366 [bh2]: https://github.com/rust-lang/rust/pull/28156
9367 [binfat]: https://github.com/rust-lang/rust/pull/28270
9368 [bm]: https://github.com/rust-lang/rust/pull/28197
9369 [cc]: https://github.com/rust-lang/rust/pull/27531
9370 [crlf]: https://github.com/rust-lang/rust/pull/28034
9371 [cu]: https://github.com/rust-lang/cargo/pull/1931
9372 [d]: https://github.com/rust-lang/rust/pull/27825
9373 [dep]: https://github.com/rust-lang/rust/pull/28339
9374 [es]: https://github.com/rust-lang/rust/pull/27956
9375 [ext]: https://github.com/rust-lang/rust/pull/28094
9376 [faststr]: https://github.com/rust-lang/rust/pull/28338
9377 [ffi]: https://github.com/rust-lang/rust/pull/28779
9378 [fp]: https://github.com/rust-lang/rust/pull/28268
9379 [fp2]: https://github.com/rust-lang/rust/pull/28560
9380 [fp3]: https://github.com/rust-lang/rust/pull/27307
9381 [i]: https://github.com/rust-lang/rust/pull/27451
9382 [into2]: https://github.com/rust-lang/rust/pull/28039
9383 [it]: https://github.com/rust-lang/rust/pull/27652
9384 [mm]: https://github.com/rust-lang/rust/pull/27338
9385 [mutw]: https://github.com/rust-lang/rust/pull/28368
9386 [sound]: https://github.com/rust-lang/rust/pull/27641
9387 [p]: https://github.com/rust-lang/rust/pull/27866
9388 [pec]: https://github.com/rust-lang/rust/pull/28486
9389 [pr]: https://github.com/rust-lang/rust/pull/27896
9390 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9391 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
9392 [s]: https://github.com/rust-lang/rust/pull/27474
9393 [stab]: https://github.com/rust-lang/rust/pull/28339
9394 [stat]: https://github.com/rust-lang/rust/pull/28321
9395 [vd]: https://github.com/rust-lang/rust/pull/28494
9397 Version 1.3.0 (2015-09-17)
9398 ==============================
9400 * ~900 changes, numerous bugfixes
9405 * The [new object lifetime defaults][nold] have been [turned
9406 on][nold2] after a cycle of warnings about the change. Now types
9407 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
9408 being interpreted as `&'a Box<Trait+'a>` to `&'a
9409 Box<Trait+'static>`.
9410 * [The Rustonomicon][nom] is a new book in the official documentation
9411 that dives into writing unsafe Rust.
9412 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
9413 timekeeping is employed by other std APIs, as well as out-of-tree
9419 * The [new object lifetime defaults][nold] have been [turned
9420 on][nold2] after a cycle of warnings about the change.
9421 * There is a known [regression][lr] in how object lifetime elision is
9422 interpreted, the proper solution for which is undetermined.
9423 * The `#[prelude_import]` attribute, an internal implementation
9424 detail, was accidentally stabilized previously. [It has been put
9425 behind the `prelude_import` feature gate][pi]. This change is
9426 believed to break no existing code.
9427 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9428 [more sane for dynamically sized types][dst3]. Code that relied on
9429 the previous behavior is thought to be broken.
9430 * The `dropck` rules, which checks that destructors can't access
9431 destroyed values, [have been updated][dropck] to match the
9432 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9433 cause some previously-compiling code to no longer build.
9438 * The [new object lifetime defaults][nold] have been [turned
9439 on][nold2] after a cycle of warnings about the change.
9440 * Semicolons may [now follow types and paths in
9441 macros](https://github.com/rust-lang/rust/pull/27000).
9442 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9443 [more sane for dynamically sized types][dst3]. Code that relied on
9444 the previous behavior is not known to exist, and suspected to be
9446 * `'static` variables [may now be recursive][st].
9447 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9448 implementations correctly.
9449 * The `dropck` rules, which checks that destructors can't access
9450 destroyed values, [have been updated][dropck] to match the
9456 * The [`Duration`] API, [has been stabilized][ds], as well as the
9457 `std::time` module, which presently contains only `Duration`.
9458 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9459 * The owned C string, [`CString`], implements [`Borrow`] and the
9460 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9461 these allow C strings to be borrowed and cloned in generic code.
9462 * [`CStr`] implements [`Debug`].
9463 * [`AtomicPtr`] implements [`Debug`].
9464 * [`Error`] trait objects [can be downcast to their concrete types][e]
9465 in many common configurations, using the [`is`], [`downcast`],
9466 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9468 * Searching for substrings now [employs the two-way algorithm][search]
9469 instead of doing a naive search. This gives major speedups to a
9470 number of methods, including [`contains`][sc], [`find`][sf],
9471 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9472 [`ends_with`][sew] are also faster.
9473 * The performance of `PartialEq` for slices is [much faster][ps].
9474 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9475 is overridden and optimized by the implementations for scalars.
9476 * The [`Hasher`] trait now has a number of specialized `write_*`
9477 methods for primitive types, for efficiency.
9478 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9479 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9480 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9481 of [`std::error::Error::cause`][iec] also delegates to the inner
9483 * [`process::Child`][pc] gained the [`id`] method, which returns a
9484 `u32` representing the platform-specific process identifier.
9485 * The [`connect`] method on slices is deprecated, replaced by the new
9486 [`join`] method (note that both of these are on the *unstable*
9487 [`SliceConcatExt`] trait, but through the magic of the prelude are
9488 available to stable code anyway).
9489 * The [`Div`] operator is implemented for [`Wrapping`] types.
9490 * [`DerefMut` is implemented for `String`][dms].
9491 * Performance of SipHash (the default hasher for `HashMap`) is
9492 [better for long data][sh].
9493 * [`AtomicPtr`] implements [`Send`].
9494 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9495 are now [specialized to use uninitialized buffers for increased
9497 * Lifetime parameters of foreign functions [are now resolved
9503 * Rust can now, with some coercion, [produce programs that run on
9504 Windows XP][xp], though XP is not considered a supported platform.
9505 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9506 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9507 recommended for use in 1.3, though should be fully-functional
9508 in the [64-bit 1.4 beta][b14].
9509 * On Fedora-based systems installation will [properly configure the
9510 dynamic linker][fl].
9511 * The compiler gained many new extended error descriptions, which can
9512 be accessed with the `--explain` flag.
9513 * The `dropck` pass, which checks that destructors can't access
9514 destroyed values, [has been rewritten][27261]. This fixes some
9515 soundness holes, and as such will cause some previously-compiling
9516 code to no longer build.
9517 * `rustc` now uses [LLVM to write archive files where possible][ar].
9518 Eventually this will eliminate the compiler's dependency on the ar
9520 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9521 supported FreeBSD on x86_64).
9522 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9523 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9525 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9526 will kill the process instead of leaking][nlp].
9528 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9529 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9530 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9531 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9532 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9533 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9534 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9535 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9536 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9537 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9538 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9539 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9540 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9541 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9542 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9543 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9544 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9545 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9546 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9547 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9548 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9549 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9550 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9551 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9552 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9553 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9554 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9555 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9556 [ar]: https://github.com/rust-lang/rust/pull/26926
9557 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9558 [dms]: https://github.com/rust-lang/rust/pull/26241
9559 [27261]: https://github.com/rust-lang/rust/pull/27261
9560 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9561 [ds]: https://github.com/rust-lang/rust/pull/26818
9562 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9563 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9564 [dst3]: https://github.com/rust-lang/rust/pull/27351
9565 [e]: https://github.com/rust-lang/rust/pull/24793
9566 [f]: https://github.com/rust-lang/rust/pull/26588
9567 [26959]: https://github.com/rust-lang/rust/pull/26959
9568 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9569 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9570 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9571 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9572 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9573 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9574 [lic]: https://github.com/rust-lang/rust/pull/26583
9575 [lnu]: https://github.com/rust-lang/rust/pull/27026
9576 [lr]: https://github.com/rust-lang/rust/issues/27248
9577 [lum]: https://github.com/rust-lang/rust/pull/26378
9578 [lur]: https://github.com/rust-lang/rust/pull/26783
9579 [nlp]: https://github.com/rust-lang/rust/pull/27176
9580 [nold2]: https://github.com/rust-lang/rust/pull/27045
9581 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9582 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9583 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9584 [pi]: https://github.com/rust-lang/rust/pull/26699
9585 [ps]: https://github.com/rust-lang/rust/pull/26884
9586 [rte]: https://github.com/rust-lang/rust/pull/26950
9587 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9588 [search]: https://github.com/rust-lang/rust/pull/26327
9589 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9590 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9591 [sh]: https://github.com/rust-lang/rust/pull/27280
9592 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9593 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9594 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9595 [st]: https://github.com/rust-lang/rust/pull/26630
9596 [win1]: https://github.com/rust-lang/rust/pull/26569
9597 [win2]: https://github.com/rust-lang/rust/pull/26741
9598 [win3]: https://github.com/rust-lang/rust/pull/26741
9599 [win4]: https://github.com/rust-lang/rust/pull/27210
9600 [xp]: https://github.com/rust-lang/rust/pull/26569
9602 Version 1.2.0 (2015-08-07)
9603 ==========================
9605 * ~1200 changes, numerous bugfixes
9610 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9611 like `Rc` to contain types without a fixed size, arrays and trait
9612 objects, finally enabling use of `Rc<[T]>` and completing the
9613 implementation of DST.
9614 * [Parallel codegen][parcodegen] is now working again, which can
9615 substantially speed up large builds in debug mode; It also gets
9616 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9617 jobs). It's not enabled by default, but will be "in the near
9618 future". It can be activated with the `-C codegen-units=N` flag to
9620 * This is the first release with [experimental support for linking
9621 with the MSVC linker and lib C on Windows (instead of using the GNU
9622 variants via MinGW)][win]. It is yet recommended only for the most
9623 intrepid Rustaceans.
9624 * Benchmark compilations are showing a 30% improvement in
9625 bootstrapping over 1.1.
9630 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9631 unicode case mapping, which is a previously-planned change in
9632 behavior and considered a bugfix.
9633 * [`mem::align_of`] now specifies [the *minimum alignment* for
9634 T][align], which is usually the alignment programs are interested
9635 in, and the same value reported by clang's
9636 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9638 * [The `#[packed]` attribute is no longer silently accepted by the
9639 compiler][packed]. This attribute did nothing and code that
9640 mentioned it likely did not work as intended.
9641 * Associated type defaults are [now behind the
9642 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9643 defaults *did not work*, but could be mentioned syntactically. As
9644 such this breakage has minimal impact.
9649 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9650 matching against dereferenceable values.
9655 * The [`Extend`] trait, which grows a collection from an iterator, is
9656 implemented over iterators of references, for `String`, `Vec`,
9657 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9658 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9659 * The [`iter::once`] function returns an iterator that yields a single
9660 element, and [`iter::empty`] returns an iterator that yields no
9662 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9663 over substring matches.
9664 * [`Cell`] and [`RefCell`] both implement `Eq`.
9665 * A number of methods for wrapping arithmetic are added to the
9666 integral types, [`wrapping_div`], [`wrapping_rem`],
9667 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9668 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9669 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9670 type.. It is illegal for the default arithmetic operations in Rust
9671 to overflow; the desire to wrap must be explicit.
9672 * The `{:#?}` formatting specifier [displays the alternate,
9673 pretty-printed][debugfmt] form of the `Debug` formatter. This
9674 feature was actually introduced prior to 1.0 with little
9676 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9677 for writing data to formatted strings, similar to [`io::Write`].
9678 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9679 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9680 are used by code generators to emit implementations of [`Debug`].
9681 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9682 methods that convert case, following Unicode case mapping.
9683 * It is now easier to handle poisoned locks. The [`PoisonError`]
9684 type, returned by failing lock operations, exposes `into_inner`,
9685 `get_ref`, and `get_mut`, which all give access to the inner lock
9686 guard, and allow the poisoned lock to continue to operate. The
9687 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9688 poisoned lock without attempting to take the lock.
9689 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9690 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9691 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9692 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9694 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9700 * `rustc` employs smarter heuristics for guessing at [typos].
9701 * `rustc` emits more efficient code for [no-op conversions between
9702 unsafe pointers][nop].
9703 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9704 resulting in faster compile times and smaller code.
9706 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9707 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9708 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9709 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9710 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9711 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9712 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9713 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9714 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9715 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9716 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9717 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9718 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9719 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9720 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9721 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9722 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9723 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9724 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9725 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9726 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9727 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9728 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9729 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9730 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9731 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9732 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9733 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9734 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9735 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9736 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9737 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9738 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9739 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9740 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9741 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9742 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9743 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9744 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9745 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9746 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9747 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9748 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9749 [align]: https://github.com/rust-lang/rust/pull/25646
9750 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9751 [typos]: https://github.com/rust-lang/rust/pull/26087
9752 [nop]: https://github.com/rust-lang/rust/pull/26336
9753 [fat]: https://github.com/rust-lang/rust/pull/26411
9754 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9755 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9756 [packed]: https://github.com/rust-lang/rust/pull/25541
9757 [ad]: https://github.com/rust-lang/rust/pull/27382
9758 [win]: https://github.com/rust-lang/rust/pull/25350
9760 Version 1.1.0 (2015-06-25)
9761 =========================
9763 * ~850 changes, numerous bugfixes
9768 * The [`std::fs` module has been expanded][fs] to expand the set of
9769 functionality exposed:
9770 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9771 don't incur a syscall on some platforms.
9772 * A `symlink_metadata` function has been added.
9773 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9774 access to all underlying information.
9775 * The compiler now contains extended explanations of many errors. When an error
9776 with an explanation occurs the compiler suggests using the `--explain` flag
9777 to read the explanation. Error explanations are also [available online][err-index].
9778 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9779 well as other work, the time to bootstrap the compiler decreased by
9785 * The [`str::split_whitespace`] method splits a string on unicode
9786 whitespace boundaries.
9787 * On both Windows and Unix, new extension traits provide conversion of
9788 I/O types to and from the underlying system handles. On Unix, these
9789 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9790 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9791 `TcpListener`, and `UpdSocket`. Further implementations for
9792 `std::process` will be stabilized later.
9793 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9794 Windows, symlinks can be created with
9795 `std::os::windows::symlink_dir` and
9796 `std::os::windows::symlink_file`.
9797 * The `mpsc::Receiver` type can now be converted into an iterator with
9798 `into_iter` on the [`IntoIterator`] trait.
9799 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9800 implementation of the [`From`] trait.
9801 * The `Debug` implementation for `RangeFull` [creates output that is
9802 more consistent with other implementations][rf].
9803 * [`Debug` is implemented for `File`][file].
9804 * The `Default` implementation for `Arc` [no longer requires `Sync +
9806 * [The `Iterator` methods `count`, `nth`, and `last` have been
9807 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9808 * Incorrect handling of paths on Windows has been improved in both the
9809 compiler and the standard library.
9810 * [`AtomicPtr` gained a `Default` implementation][ap].
9811 * In accordance with Rust's policy on arithmetic overflow `abs` now
9812 [panics on overflow when debug assertions are enabled][abs].
9813 * The [`Cloned`] iterator, which was accidentally left unstable for
9814 1.0 [has been stabilized][c].
9815 * The [`Incoming`] iterator, which iterates over incoming TCP
9816 connections, and which was accidentally unnamable in 1.0, [is now
9817 properly exported][inc].
9818 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9819 `sift_up` or `sift_down` panic][bh].
9820 * The [`split_off`] method of `LinkedList` [no longer corrupts
9821 the list in certain scenarios][ll].
9826 * Type checking performance [has improved notably][sk] with
9827 [multiple improvements][pre].
9828 * The compiler [suggests code changes][ch] for more errors.
9829 * rustc and it's build system have experimental support for [building
9830 toolchains against MUSL][m] instead of glibc on Linux.
9831 * The compiler defines the `target_env` cfg value, which is used for
9832 distinguishing toolchains that are otherwise for the same
9833 platform. Presently this is set to `gnu` for common GNU Linux
9834 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9835 * The [`cargo rustc`][crc] command invokes a build with custom flags
9837 * [Android executables are always position independent][pie].
9838 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9839 with `Drop`][24935].
9841 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9842 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9843 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9844 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9845 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9846 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9847 [rf]: https://github.com/rust-lang/rust/pull/24491
9848 [err-index]: https://doc.rust-lang.org/error-index.html
9849 [sk]: https://github.com/rust-lang/rust/pull/24615
9850 [pre]: https://github.com/rust-lang/rust/pull/25323
9851 [file]: https://github.com/rust-lang/rust/pull/24598
9852 [ch]: https://github.com/rust-lang/rust/pull/24683
9853 [arc]: https://github.com/rust-lang/rust/pull/24695
9854 [si]: https://github.com/rust-lang/rust/pull/24701
9855 [ap]: https://github.com/rust-lang/rust/pull/24834
9856 [m]: https://github.com/rust-lang/rust/pull/24777
9857 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9858 [crc]: https://github.com/rust-lang/cargo/pull/1568
9859 [pie]: https://github.com/rust-lang/rust/pull/24953
9860 [abs]: https://github.com/rust-lang/rust/pull/25441
9861 [c]: https://github.com/rust-lang/rust/pull/25496
9862 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9863 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9864 [inc]: https://github.com/rust-lang/rust/pull/25522
9865 [bh]: https://github.com/rust-lang/rust/pull/25856
9866 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9867 [ll]: https://github.com/rust-lang/rust/pull/26022
9868 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9869 [24935]: https://github.com/rust-lang/rust/pull/24935
9871 Version 1.0.0 (2015-05-15)
9872 ========================
9874 * ~1500 changes, numerous bugfixes
9879 * The vast majority of the standard library is now `#[stable]`. It is
9880 no longer possible to use unstable features with a stable build of
9882 * Many popular crates on [crates.io] now work on the stable release
9884 * Arithmetic on basic integer types now [checks for overflow in debug
9890 * Several [restrictions have been added to trait coherence][coh] in
9891 order to make it easier for upstream authors to change traits
9892 without breaking downstream code.
9893 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9894 improve error messages and macro behavior. For example, `0b1234` is
9895 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9896 * Trait bounds [are always invariant][inv], eliminating the need for
9897 the `PhantomFn` and `MarkerTrait` lang items, which have been
9899 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9900 "foo" as bar` syntax has been replaced with `extern crate foo as
9901 bar`, and Cargo now automatically translates "-" in *package* names
9902 to underscore for the crate name.
9903 * [Lifetime shadowing is an error][lt].
9904 * [`Send` no longer implies `'static`][send-rfc].
9905 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9906 `MyType::default()`.
9907 * Primitive types [now have inherent methods][prim-inherent],
9908 obviating the need for extension traits like `SliceExt`.
9909 * Methods with `Self: Sized` in their `where` clause are [considered
9910 object-safe][self-sized], allowing many extension traits like
9911 `IteratorExt` to be merged into the traits they extended.
9912 * You can now [refer to associated types][assoc-where] whose
9913 corresponding trait bounds appear only in a `where` clause.
9914 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9915 like `Send` and `Sync` are now library-defined.
9916 * A [Reflect trait][reflect] was introduced, which means that
9917 downcasting via the `Any` trait is effectively limited to concrete
9918 types. This helps retain the potentially-important "parametricity"
9919 property: generic code cannot behave differently for different type
9920 arguments except in minor ways.
9921 * The `unsafe_destructor` feature is now deprecated in favor of the
9922 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9928 * The `thread_local` module [has been renamed to `std::thread`][th].
9929 * The methods of `IteratorExt` [have been moved to the `Iterator`
9930 trait itself][23300].
9931 * Several traits that implement Rust's conventions for type
9932 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9933 [centralized in the `std::convert` module][con].
9934 * The `FromError` trait [was removed in favor of `From`][fe].
9935 * The basic sleep function [has moved to
9936 `std::thread::sleep_ms`][slp].
9937 * The `splitn` function now takes an `n` parameter that represents the
9938 number of items yielded by the returned iterator [instead of the
9939 number of 'splits'][spl].
9940 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9941 * [Derived implementations of `PartialOrd` now order enums according
9942 to their explicitly-assigned discriminants][po].
9943 * [Methods for searching strings are generic over `Pattern`s][pat],
9944 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9946 * [In method resolution, object methods are resolved before inherent
9948 * [`String::from_str` has been deprecated in favor of the `From` impl,
9949 `String::from`][24517].
9950 * [`io::Error` implements `Sync`][ios].
9951 * [The `words` method on `&str` has been replaced with
9952 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9954 * The new path and IO modules are complete and `#[stable]`. This
9955 was the major library focus for this cycle.
9956 * The path API was [revised][path-normalize] to normalize `.`,
9957 adjusting the tradeoffs in favor of the most common usage.
9958 * A large number of remaining APIs in `std` were also stabilized
9959 during this cycle; about 75% of the non-deprecated API surface
9961 * The new [string pattern API][string-pattern] landed, which makes
9962 the string slice API much more internally consistent and flexible.
9963 * A new set of [generic conversion traits][conversion] replaced
9964 many existing ad hoc traits.
9965 * Generic numeric traits were [completely removed][num-traits]. This
9966 was made possible thanks to inherent methods for primitive types,
9967 and the removal gives maximal flexibility for designing a numeric
9968 hierarchy in the future.
9969 * The `Fn` traits are now related via [inheritance][fn-inherit]
9970 and provide ergonomic [blanket implementations][fn-blanket].
9971 * The `Index` and `IndexMut` traits were changed to
9972 [take the index by value][index-value], enabling code like
9973 `hash_map["string"]` to work.
9974 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9975 `Copy` data is known to be `Clone` as well.
9980 * Many errors now have extended explanations that can be accessed with
9981 the `--explain` flag to `rustc`.
9982 * Many new examples have been added to the standard library
9984 * rustdoc has received a number of improvements focused on completion
9986 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9987 * Much headway was made on ecosystem-wide CI, making it possible
9988 to [compare builds for breakage][ci-compare].
9991 [crates.io]: http://crates.io
9992 [clo]: https://github.com/rust-lang/rust/pull/24034
9993 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9994 [con]: https://github.com/rust-lang/rust/pull/23875
9995 [cr]: https://github.com/rust-lang/rust/pull/23419
9996 [fe]: https://github.com/rust-lang/rust/pull/23879
9997 [23300]: https://github.com/rust-lang/rust/pull/23300
9998 [inv]: https://github.com/rust-lang/rust/pull/23938
9999 [ios]: https://github.com/rust-lang/rust/pull/24133
10000 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
10001 [lt]: https://github.com/rust-lang/rust/pull/24057
10002 [meth]: https://github.com/rust-lang/rust/pull/24056
10003 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
10004 [po]: https://github.com/rust-lang/rust/pull/24270
10005 [24517]: https://github.com/rust-lang/rust/pull/24517
10006 [slp]: https://github.com/rust-lang/rust/pull/23949
10007 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
10008 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
10009 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
10010 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
10011 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
10012 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
10013 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
10014 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
10015 [self-sized]: https://github.com/rust-lang/rust/pull/22301
10016 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
10017 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
10018 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
10019 [reflect]: https://github.com/rust-lang/rust/pull/23712
10020 [conversion]: https://github.com/rust-lang/rfcs/pull/529
10021 [num-traits]: https://github.com/rust-lang/rust/pull/23549
10022 [index-value]: https://github.com/rust-lang/rust/pull/23601
10023 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
10024 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
10025 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
10026 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
10027 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
10028 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
10031 Version 1.0.0-alpha.2 (2015-02-20)
10032 =====================================
10034 * ~1300 changes, numerous bugfixes
10038 * The various I/O modules were [overhauled][io-rfc] to reduce
10039 unnecessary abstractions and provide better interoperation with
10040 the underlying platform. The old `io` module remains temporarily
10042 * The standard library now [participates in feature gating][feat],
10043 so use of unstable libraries now requires a `#![feature(...)]`
10044 attribute. The impact of this change is [described on the
10045 forum][feat-forum]. [RFC][feat-rfc].
10049 * `for` loops [now operate on the `IntoIterator` trait][into],
10050 which eliminates the need to call `.iter()`, etc. to iterate
10051 over collections. There are some new subtleties to remember
10052 though regarding what sort of iterators various types yield, in
10053 particular that `for foo in bar { }` yields values from a move
10054 iterator, destroying the original collection. [RFC][into-rfc].
10055 * Objects now have [default lifetime bounds][obj], so you don't
10056 have to write `Box<Trait+'static>` when you don't care about
10057 storing references. [RFC][obj-rfc].
10058 * In types that implement `Drop`, [lifetimes must outlive the
10059 value][drop]. This will soon make it possible to safely
10060 implement `Drop` for types where `#[unsafe_destructor]` is now
10061 required. Read the [gorgeous RFC][drop-rfc] for details.
10062 * The fully qualified <T as Trait>::X syntax lets you set the Self
10063 type for a trait method or associated type. [RFC][ufcs-rfc].
10064 * References to types that implement `Deref<U>` now [automatically
10065 coerce to references][deref] to the dereferenced type `U`,
10066 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
10067 should eliminate many unsightly uses of `&*`, as when converting
10068 from references to vectors into references to
10069 slices. [RFC][deref-rfc].
10070 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
10071 `|:|`) is obsolete and closure kind is inferred from context.
10072 * [`Self` is a keyword][Self].
10076 * The `Show` and `String` formatting traits [have been
10077 renamed][fmt] to `Debug` and `Display` to more clearly reflect
10078 their related purposes. Automatically getting a string
10079 conversion to use with `format!("{:?}", something_to_debug)` is
10080 now written `#[derive(Debug)]`.
10081 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
10082 OsStr}`, provide strings in platform-specific encodings for easier
10083 interop with system APIs. [RFC][osstr-rfc].
10084 * The `boxed::into_raw` and `Box::from_raw` functions [convert
10085 between `Box<T>` and `*mut T`][boxraw], a common pattern for
10086 creating raw pointers.
10090 * Certain long error messages of the form 'expected foo found bar'
10091 are now [split neatly across multiple
10092 lines][multiline]. Examples in the PR.
10093 * On Unix Rust can be [uninstalled][un] by running
10094 `/usr/local/lib/rustlib/uninstall.sh`.
10095 * The `#[rustc_on_unimplemented]` attribute, requiring the
10096 'on_unimplemented' feature, lets rustc [display custom error
10097 messages when a trait is expected to be implemented for a type
10102 * Rust is tested against a [LALR grammar][lalr], which parses
10103 almost all the Rust files that rustc does.
10105 [boxraw]: https://github.com/rust-lang/rust/pull/21318
10106 [close]: https://github.com/rust-lang/rust/pull/21843
10107 [deref]: https://github.com/rust-lang/rust/pull/21351
10108 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
10109 [drop]: https://github.com/rust-lang/rust/pull/21972
10110 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
10111 [feat]: https://github.com/rust-lang/rust/pull/21248
10112 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
10113 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
10114 [fmt]: https://github.com/rust-lang/rust/pull/21457
10115 [into]: https://github.com/rust-lang/rust/pull/20790
10116 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
10117 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10118 [lalr]: https://github.com/rust-lang/rust/pull/21452
10119 [multiline]: https://github.com/rust-lang/rust/pull/19870
10120 [obj]: https://github.com/rust-lang/rust/pull/22230
10121 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
10122 [onun]: https://github.com/rust-lang/rust/pull/20889
10123 [osstr]: https://github.com/rust-lang/rust/pull/21488
10124 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
10125 [Self]: https://github.com/rust-lang/rust/pull/22158
10126 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
10127 [un]: https://github.com/rust-lang/rust/pull/22256
10130 Version 1.0.0-alpha (2015-01-09)
10131 ==================================
10133 * ~2400 changes, numerous bugfixes
10137 * The language itself is considered feature complete for 1.0,
10138 though there will be many usability improvements and bugfixes
10139 before the final release.
10140 * Nearly 50% of the public API surface of the standard library has
10141 been declared 'stable'. Those interfaces are unlikely to change
10143 * The long-running debate over integer types has been
10144 [settled][ints]: Rust will ship with types named `isize` and
10145 `usize`, rather than `int` and `uint`, for pointer-sized
10146 integers. Guidelines will be rolled out during the alpha cycle.
10147 * Most crates that are not `std` have been moved out of the Rust
10148 distribution into the Cargo ecosystem so they can evolve
10149 separately and don't need to be stabilized as quickly, including
10150 'time', 'getopts', 'num', 'regex', and 'term'.
10151 * Documentation continues to be expanded with more API coverage, more
10152 examples, and more in-depth explanations. The guides have been
10153 consolidated into [The Rust Programming Language][trpl].
10154 * "[Rust By Example][rbe]" is now maintained by the Rust team.
10155 * All official Rust binary installers now come with [Cargo], the
10156 Rust package manager.
10160 * Closures have been [completely redesigned][unboxed] to be
10161 implemented in terms of traits, can now be used as generic type
10162 bounds and thus monomorphized and inlined, or via an opaque
10163 pointer (boxed) as in the old system. The new system is often
10164 referred to as 'unboxed' closures.
10165 * Traits now support [associated types][assoc], allowing families
10166 of related types to be defined together and used generically in
10168 * Enum variants are [namespaced by their type names][enum].
10169 * [`where` clauses][where] provide a more versatile and attractive
10170 syntax for specifying generic bounds, though the previous syntax
10172 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
10174 * Rust [no longer has a runtime][rt] of any description, and only
10175 supports OS threads, not green threads.
10176 * At long last, Rust has been overhauled for 'dynamically-sized
10177 types' ([DST]), which integrates 'fat pointers' (object types,
10178 arrays, and `str`) more deeply into the type system, making it
10180 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
10181 `..j` that produce range types and which, when combined with the
10182 `Index` operator and multidispatch, leads to a convenient slice
10183 notation, `[i..j]`.
10184 * The new range syntax revealed an ambiguity in the fixed-length
10185 array syntax, so now fixed length arrays [are written `[T;
10187 * The `Copy` trait is no longer implemented automatically. Unsafe
10188 pointers no longer implement `Sync` and `Send` so types
10189 containing them don't automatically either. `Sync` and `Send`
10190 are now 'unsafe traits' so one can "forcibly" implement them via
10191 `unsafe impl` if a type confirms to the requirements for them
10192 even though the internals do not (e.g. structs containing unsafe
10193 pointers like `Arc`). These changes are intended to prevent some
10194 footguns and are collectively known as [opt-in built-in
10195 traits][oibit] (though `Sync` and `Send` will soon become pure
10196 library types unknown to the compiler).
10197 * Operator traits now take their operands [by value][ops], and
10198 comparison traits can use multidispatch to compare one type
10199 against multiple other types, allowing e.g. `String` to be
10200 compared with `&str`.
10201 * `if let` and `while let` are no longer feature-gated.
10202 * Rust has adopted a more [uniform syntax for escaping unicode
10203 characters][unicode].
10204 * `macro_rules!` [has been declared stable][mac]. Though it is a
10205 flawed system it is sufficiently popular that it must be usable
10206 for 1.0. Effort has gone into [future-proofing][mac-future] it
10207 in ways that will allow other macro systems to be developed in
10208 parallel, and won't otherwise impact the evolution of the
10210 * The prelude has been [pared back significantly][prelude] such
10211 that it is the minimum necessary to support the most pervasive
10212 code patterns, and through [generalized where clauses][where]
10213 many of the prelude extension traits have been consolidated.
10214 * Rust's rudimentary reflection [has been removed][refl], as it
10215 incurred too much code generation for little benefit.
10216 * [Struct variants][structvars] are no longer feature-gated.
10217 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
10218 known as 'higher-ranked trait bounds', this crucially allows
10219 unboxed closures to work.
10220 * Macros invocations surrounded by parens or square brackets and
10221 not terminated by a semicolon are [parsed as
10222 expressions][macros], which makes expressions like `vec![1i32,
10223 2, 3].len()` work as expected.
10224 * Trait objects now implement their traits automatically, and
10225 traits that can be coerced to objects now must be [object
10227 * Automatically deriving traits is now done with `#[derive(...)]`
10228 not `#[deriving(...)]` for [consistency with other naming
10229 conventions][derive].
10230 * Importing the containing module or enum at the same time as
10231 items or variants they contain is [now done with `self` instead
10232 of `mod`][self], as in use `foo::{self, bar}`
10233 * Glob imports are no longer feature-gated.
10234 * The `box` operator and `box` patterns have been feature-gated
10235 pending a redesign. For now unique boxes should be allocated
10236 like other containers, with `Box::new`.
10240 * A [series][coll1] of [efforts][coll2] to establish
10241 [conventions][coll3] for collections types has resulted in API
10242 improvements throughout the standard library.
10243 * New [APIs for error handling][err] provide ergonomic interop
10244 between error types, and [new conventions][err-conv] describe
10245 more clearly the recommended error handling strategies in Rust.
10246 * The `fail!` macro has been renamed to [`panic!`][panic] so that
10247 it is easier to discuss failure in the context of error handling
10248 without making clarifications as to whether you are referring to
10249 the 'fail' macro or failure more generally.
10250 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
10251 syscall when available.
10252 * The 'serialize' crate has been renamed 'rustc-serialize' and
10253 moved out of the distribution to Cargo. Although it is widely
10254 used now, it is expected to be superseded in the near future.
10255 * The `Show` formatter, typically implemented with
10256 `#[derive(Show)]` is [now requested with the `{:?}`
10257 specifier][show] and is intended for use by all types, for uses
10258 such as `println!` debugging. The new `String` formatter must be
10259 implemented by hand, uses the `{}` specifier, and is intended
10260 for full-fidelity conversions of things that can logically be
10261 represented as strings.
10265 * [Flexible target specification][flex] allows rustc's code
10266 generation to be configured to support otherwise-unsupported
10268 * Rust comes with rust-gdb and rust-lldb scripts that launch their
10269 respective debuggers with Rust-appropriate pretty-printing.
10270 * The Windows installation of Rust is distributed with the
10271 MinGW components currently required to link binaries on that
10276 * Nullable enum optimizations have been extended to more types so
10277 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
10278 space than the inner types themselves.
10279 * Work has begun on supporting AArch64.
10281 [Cargo]: https://crates.io
10282 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
10283 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
10284 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
10285 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
10286 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
10287 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
10288 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
10289 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
10290 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
10291 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
10292 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
10293 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
10294 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
10295 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
10296 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
10297 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
10298 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
10299 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
10300 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
10301 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
10302 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
10303 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
10304 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
10305 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
10306 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
10307 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
10308 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
10309 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
10310 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
10311 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
10312 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
10313 [trpl]: https://doc.rust-lang.org/book/index.html
10314 [rbe]: http://rustbyexample.com/
10317 Version 0.12.0 (2014-10-09)
10318 =============================
10320 * ~1900 changes, numerous bugfixes
10324 * The introductory documentation (now called The Rust Guide) has
10325 been completely rewritten, as have a number of supplementary
10327 * Rust's package manager, Cargo, continues to improve and is
10328 sometimes considered to be quite awesome.
10329 * Many API's in `std` have been reviewed and updated for
10330 consistency with the in-development Rust coding
10331 guidelines. The standard library documentation tracks
10332 stabilization progress.
10333 * Minor libraries have been moved out-of-tree to the rust-lang org
10334 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
10335 be installed with Cargo.
10336 * Lifetime elision allows lifetime annotations to be left off of
10337 function declarations in many common scenarios.
10338 * Rust now works on 64-bit Windows.
10341 * Indexing can be overloaded with the `Index` and `IndexMut`
10343 * The `if let` construct takes a branch only if the `let` pattern
10344 matches, currently behind the 'if_let' feature gate.
10345 * 'where clauses', a more flexible syntax for specifying trait
10346 bounds that is more aesthetic, have been added for traits and
10347 free functions. Where clauses will in the future make it
10348 possible to constrain associated types, which would be
10349 impossible with the existing syntax.
10350 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
10351 the 'slicing_syntax' feature gate, and can be overloaded with
10352 the `Slice` or `SliceMut` traits.
10353 * The syntax for matching of sub-slices has been changed to use a
10354 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
10355 consistency with other uses of `..` and to future-proof
10356 potential additional uses of the syntax.
10357 * The syntax for matching inclusive ranges in patterns has changed
10358 from `0..3` to `0...4` to be consistent with the exclusive range
10359 syntax for slicing.
10360 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
10361 c]`) has been put behind the 'advanced_slice_patterns' feature
10362 gate and may be removed in the future.
10363 * Components of tuples and tuple structs can be extracted using
10364 the `value.0` syntax, currently behind the `tuple_indexing`
10366 * The `#[crate_id]` attribute is no longer supported; versioning
10367 is handled by the package manager.
10368 * Renaming crate imports are now written `extern crate foo as bar`
10369 instead of `extern crate bar = foo`.
10370 * Renaming use statements are now written `use foo as bar` instead
10371 of `use bar = foo`.
10372 * `let` and `match` bindings and argument names in macros are now
10374 * The new, more efficient, closure types ('unboxed closures') have
10375 been added under a feature gate, 'unboxed_closures'. These will
10376 soon replace the existing closure types, once higher-ranked
10377 trait lifetimes are added to the language.
10378 * `move` has been added as a keyword, for indicating closures
10379 that capture by value.
10380 * Mutation and assignment is no longer allowed in pattern guards.
10381 * Generic structs and enums can now have trait bounds.
10382 * The `Share` trait is now called `Sync` to free up the term
10383 'shared' to refer to 'shared reference' (the default reference
10385 * Dynamically-sized types have been mostly implemented,
10386 unifying the behavior of fat-pointer types with the rest of the
10388 * As part of dynamically-sized types, the `Sized` trait has been
10389 introduced, which qualifying types implement by default, and
10390 which type parameters expect by default. To specify that a type
10391 parameter does not need to be sized, write `<Sized? T>`. Most
10392 types are `Sized`, notable exceptions being unsized arrays
10393 (`[T]`) and trait types.
10394 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
10395 * Lifetime bounds can now be applied to type parameters and object
10397 * The old, reference counted GC type, `Gc<T>` which was once
10398 denoted by the `@` sigil, has finally been removed. GC will be
10399 revisited in the future.
10402 * Library documentation has been improved for a number of modules.
10403 * Bit-vectors, collections::bitv has been modernized.
10404 * The url crate is deprecated in favor of
10405 http://github.com/servo/rust-url, which can be installed with
10407 * Most I/O stream types can be cloned and subsequently closed from
10408 a different thread.
10409 * A `std::time::Duration` type has been added for use in I/O
10410 methods that rely on timers, as well as in the 'time' crate's
10411 `Timespec` arithmetic.
10412 * The runtime I/O abstraction layer that enabled the green thread
10413 scheduler to do non-thread-blocking I/O has been removed, along
10414 with the libuv-based implementation employed by the green thread
10415 scheduler. This will greatly simplify the future I/O work.
10416 * `collections::btree` has been rewritten to have a more
10417 idiomatic and efficient design.
10420 * rustdoc output now indicates the stability levels of API's.
10421 * The `--crate-name` flag can specify the name of the crate
10422 being compiled, like `#[crate_name]`.
10423 * The `-C metadata` specifies additional metadata to hash into
10424 symbol names, and `-C extra-filename` specifies additional
10425 information to put into the output filename, for use by the
10426 package manager for versioning.
10427 * debug info generation has continued to improve and should be
10428 more reliable under both gdb and lldb.
10429 * rustc has experimental support for compiling in parallel
10430 using the `-C codegen-units` flag.
10431 * rustc no longer encodes rpath information into binaries by
10435 * Stack usage has been optimized with LLVM lifetime annotations.
10436 * Official Rust binaries on Linux are more compatible with older
10437 kernels and distributions, built on CentOS 5.10.
10440 Version 0.11.0 (2014-07-02)
10441 ==========================
10443 * ~1700 changes, numerous bugfixes
10446 * ~[T] has been removed from the language. This type is superseded by
10448 * ~str has been removed from the language. This type is superseded by
10450 * ~T has been removed from the language. This type is superseded by the
10452 * @T has been removed from the language. This type is superseded by the
10453 standard library's std::gc::Gc<T> type.
10454 * Struct fields are now all private by default.
10455 * Vector indices and shift amounts are both required to be a `uint`
10456 instead of any integral type.
10457 * Byte character, byte string, and raw byte string literals are now all
10458 supported by prefixing the normal literal with a `b`.
10459 * Multiple ABIs are no longer allowed in an ABI string
10460 * The syntax for lifetimes on closures/procedures has been tweaked
10461 slightly: `<'a>|A, B|: 'b + K -> T`
10462 * Floating point modulus has been removed from the language; however it
10463 is still provided by a library implementation.
10464 * Private enum variants are now disallowed.
10465 * The `priv` keyword has been removed from the language.
10466 * A closure can no longer be invoked through a &-pointer.
10467 * The `use foo, bar, baz;` syntax has been removed from the language.
10468 * The transmute intrinsic no longer works on type parameters.
10469 * Statics now allow blocks/items in their definition.
10470 * Trait bounds are separated from objects with + instead of : now.
10471 * Objects can no longer be read while they are mutably borrowed.
10472 * The address of a static is now marked as insignificant unless the
10473 #[inline(never)] attribute is placed it.
10474 * The #[unsafe_destructor] attribute is now behind a feature gate.
10475 * Struct literals are no longer allowed in ambiguous positions such as
10476 if, while, match, and for..in.
10477 * Declaration of lang items and intrinsics are now feature-gated by
10479 * Integral literals no longer default to `int`, and floating point
10480 literals no longer default to `f64`. Literals must be suffixed with an
10481 appropriate type if inference cannot determine the type of the
10483 * The Box<T> type is no longer implicitly borrowed to &mut T.
10484 * Procedures are now required to not capture borrowed references.
10487 * The standard library is now a "facade" over a number of underlying
10488 libraries. This means that development on the standard library should
10489 be speedier due to smaller crates, as well as a clearer line between
10491 * A new library, libcore, lives under the standard library's facade
10492 which is Rust's "0-assumption" library, suitable for embedded and
10493 kernel development for example.
10494 * A regex crate has been added to the standard distribution. This crate
10495 includes statically compiled regular expressions.
10496 * The unwrap/unwrap_err methods on Result require a Show bound for
10497 better error messages.
10498 * The return types of the std::comm primitives have been centralized
10499 around the Result type.
10500 * A number of I/O primitives have gained the ability to time out their
10502 * A number of I/O primitives have gained the ability to close their
10503 reading/writing halves to cancel pending operations.
10504 * Reverse iterator methods have been removed in favor of `rev()` on
10505 their forward-iteration counterparts.
10506 * A bitflags! macro has been added to enable easy interop with C and
10507 management of bit flags.
10508 * A debug_assert! macro is now provided which is disabled when
10509 `--cfg ndebug` is passed to the compiler.
10510 * A graphviz crate has been added for creating .dot files.
10511 * The std::cast module has been migrated into std::mem.
10512 * The std::local_data api has been migrated from freestanding functions
10513 to being based on methods.
10514 * The Pod trait has been renamed to Copy.
10515 * jemalloc has been added as the default allocator for types.
10516 * The API for allocating memory has been changed to use proper alignment
10517 and sized deallocation
10518 * Connecting a TcpStream or binding a TcpListener is now based on a
10519 string address and a u16 port. This allows connecting to a hostname as
10521 * The Reader trait now contains a core method, read_at_least(), which
10522 correctly handles many repeated 0-length reads.
10523 * The process-spawning API is now centered around a builder-style
10525 * The :? printing qualifier has been moved from the standard library to
10526 an external libdebug crate.
10527 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10528 have been renamed to Eq/Ord.
10529 * The select/plural methods have been removed from format!. The escapes
10530 for { and } have also changed from \{ and \} to {{ and }},
10532 * The TaskBuilder API has been re-worked to be a true builder, and
10533 extension traits for spawning native/green tasks have been added.
10536 * All breaking changes to the language or libraries now have their
10537 commit message annotated with `[breaking-change]` to allow for easy
10538 discovery of breaking changes.
10539 * The compiler will now try to suggest how to annotate lifetimes if a
10540 lifetime-related error occurs.
10541 * Debug info continues to be improved greatly with general bug fixes and
10542 better support for situations like link time optimization (LTO).
10543 * Usage of syntax extensions when cross-compiling has been fixed.
10544 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10545 -fdata-sections and --gc-sections has been enabled by default
10546 * The compiler is now stricter about where it will load module files
10547 from when a module is declared via `mod foo;`.
10548 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10549 Syntax extensions are now discovered via a "plugin registrar" type
10550 which will be extended in the future to other various plugins.
10551 * Lints have been restructured to allow for dynamically loadable lints.
10552 * A number of rustdoc improvements:
10553 * The HTML output has been visually redesigned.
10554 * Markdown is now powered by hoedown instead of sundown.
10555 * Searching heuristics have been greatly improved.
10556 * The search index has been reduced in size by a great amount.
10557 * Cross-crate documentation via `pub use` has been greatly improved.
10558 * Primitive types are now hyperlinked and documented.
10559 * Documentation has been moved from static.rust-lang.org/doc to
10561 * A new sandbox, play.rust-lang.org, is available for running and
10562 sharing rust code examples on-line.
10563 * Unused attributes are now more robustly warned about.
10564 * The dead_code lint now warns about unused struct fields.
10565 * Cross-compiling to iOS is now supported.
10566 * Cross-compiling to mipsel is now supported.
10567 * Stability attributes are now inherited by default and no longer apply
10568 to intra-crate usage, only inter-crate usage.
10569 * Error message related to non-exhaustive match expressions have been
10573 Version 0.10 (2014-04-03)
10574 =========================
10576 * ~1500 changes, numerous bugfixes
10579 * A new RFC process is now in place for modifying the language.
10580 * Patterns with `@`-pointers have been removed from the language.
10581 * Patterns with unique vectors (`~[T]`) have been removed from the
10583 * Patterns with unique strings (`~str`) have been removed from the
10585 * `@str` has been removed from the language.
10586 * `@[T]` has been removed from the language.
10587 * `@self` has been removed from the language.
10588 * `@Trait` has been removed from the language.
10589 * Headers on `~` allocations which contain `@` boxes inside the type for
10590 reference counting have been removed.
10591 * The semantics around the lifetimes of temporary expressions have changed,
10592 see #3511 and #11585 for more information.
10593 * Cross-crate syntax extensions are now possible, but feature gated. See
10594 #11151 for more information. This includes both `macro_rules!` macros as
10595 well as syntax extensions such as `format!`.
10596 * New lint modes have been added, and older ones have been turned on to be
10598 * Unnecessary parentheses
10599 * Uppercase statics
10601 * Uppercase variables
10602 * Publicly visible private types
10603 * `#[deriving]` with raw pointers
10604 * Unsafe functions can no longer be coerced to closures.
10605 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10606 * The `#[simd]` attribute is now behind a feature gate.
10607 * Visibility is no longer allowed on `extern crate` statements, and
10608 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10609 * Trailing commas are now allowed in argument lists and tuple patterns.
10610 * The `do` keyword has been removed, it is now a reserved keyword.
10611 * Default type parameters have been implemented, but are feature gated.
10612 * Borrowed variables through captures in closures are now considered soundly.
10613 * `extern mod` is now `extern crate`
10614 * The `Freeze` trait has been removed.
10615 * The `Share` trait has been added for types that can be shared among
10617 * Labels in macros are now hygienic.
10618 * Expression/statement macro invocations can be delimited with `{}` now.
10619 * Treatment of types allowed in `static mut` locations has been tweaked.
10620 * The `*` and `.` operators are now overloadable through the `Deref` and
10622 * `~Trait` and `proc` no longer have `Send` bounds by default.
10623 * Partial type hints are now supported with the `_` type marker.
10624 * An `Unsafe` type was introduced for interior mutability. It is now
10625 considered undefined to transmute from `&T` to `&mut T` without using the
10627 * The #[linkage] attribute was implemented for extern statics/functions.
10628 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10629 * `Pod` was renamed to `Copy`.
10632 * The `libextra` library has been removed. It has now been decomposed into
10633 component libraries with smaller and more focused nuggets of
10634 functionality. The full list of libraries can be found on the
10635 documentation index page.
10636 * std: `std::condition` has been removed. All I/O errors are now propagated
10637 through the `Result` type. In order to assist with error handling, a
10638 `try!` macro for unwrapping errors with an early return and a lint for
10639 unused results has been added. See #12039 for more information.
10640 * std: The `vec` module has been renamed to `slice`.
10641 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10642 This will become the only growable vector in the future.
10643 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10644 are now found at `std::io::BufferedReader` instead of
10645 `std::io::buffered::BufferedReader`.
10646 * std: `print` and `println` are no longer in the prelude, the `print!` and
10647 `println!` macros are intended to be used instead.
10648 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10649 attempts to statically prevent cycles.
10650 * std: The standard distribution is adopting the policy of pushing failure
10651 to the user rather than failing in libraries. Many functions (such as
10652 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10653 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10654 deriving mode: `#[deriving(Show)]`.
10655 * std: `ToStr` is now implemented for all types implementing `Show`.
10656 * std: The formatting trait methods now take `&self` instead of `&T`
10657 * std: The `invert()` method on iterators has been renamed to `rev()`
10658 * std: `std::num` has seen a reduction in the genericity of its traits,
10659 consolidating functionality into a few core traits.
10660 * std: Backtraces are now printed on task failure if the environment
10661 variable `RUST_BACKTRACE` is present.
10662 * std: Naming conventions for iterators have been standardized. More details
10663 can be found on the wiki's style guide.
10664 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10665 still implement the function.
10666 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10667 * std: `assert_approx_eq!` has been removed
10668 * std: The `e` and `E` formatting specifiers for floats have been added to
10669 print them in exponential notation.
10670 * std: The `Times` trait has been removed
10671 * std: Indications of variance and opting out of builtin bounds is done
10672 through marker types in `std::kinds::marker` now
10673 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10674 `#[deriving(Hash)]` is now possible.
10675 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10676 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10677 * std: `Chan::new` is now `channel()`.
10678 * std: A new synchronous channel type has been implemented.
10679 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10680 * std: `hashmap` and `trie` have been moved to `libcollections`
10681 * std: `run` has been rolled into `io::process`
10682 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10683 * std: The equality and comparison traits have seen some reorganization.
10684 * std: `rand` has moved to `librand`.
10685 * std: `to_{lower,upper}case` has been implemented for `char`.
10686 * std: Logging has been moved to `liblog`.
10687 * collections: `HashMap` has been rewritten for higher performance and less
10689 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10690 it can be booted manually. The runtime guide has more information and
10692 * native: All I/O functionality except signals has been implemented.
10693 * green: Task spawning with `libgreen` has been optimized with stack caching
10694 and various trimming of code.
10695 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10696 * sync: The `extra::sync` module has been updated to modern rust (and moved
10697 to the `sync` library), tweaking and improving various interfaces while
10698 dropping redundant functionality.
10699 * sync: A new `Barrier` type has been added to the `sync` library.
10700 * sync: An efficient mutex for native and green tasks has been implemented.
10701 * serialize: The `base64` module has seen some improvement. It treats
10702 newlines better, has non-string error values, and has seen general
10704 * fourcc: A `fourcc!` macro was introduced
10705 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10706 hexadecimal literal.
10709 * `rustpkg` has been deprecated and removed from the main repository. Its
10710 replacement, `cargo`, is under development.
10711 * Nightly builds of rust are now available
10712 * The memory usage of rustc has been improved many times throughout this
10714 * The build process supports disabling rpath support for the rustc binary
10716 * Code generation has improved in some cases, giving more information to the
10717 LLVM optimization passes to enable more extensive optimizations.
10718 * Debuginfo compatibility with lldb on OSX has been restored.
10719 * The master branch is now gated on an android bot, making building for
10720 android much more reliable.
10721 * Output flags have been centralized into one `--emit` flag.
10722 * Crate type flags have been centralized into one `--crate-type` flag.
10723 * Codegen flags have been consolidated behind a `-C` flag.
10724 * Linking against outdated crates now has improved error messages.
10725 * Error messages with lifetimes will often suggest how to annotate the
10726 function to fix the error.
10727 * Many more types are documented in the standard library, and new guides
10729 * Many `rustdoc` improvements:
10730 * code blocks are syntax highlighted.
10731 * render standalone markdown files.
10732 * the --test flag tests all code blocks by default.
10733 * exported macros are displayed.
10734 * re-exported types have their documentation inlined at the location of the
10736 * search works across crates that have been rendered to the same output
10740 Version 0.9 (2014-01-09)
10741 ==========================
10743 * ~1800 changes, numerous bugfixes
10746 * The `float` type has been removed. Use `f32` or `f64` instead.
10747 * A new facility for enabling experimental features (feature gating) has
10748 been added, using the crate-level `#[feature(foo)]` attribute.
10749 * Managed boxes (@) are now behind a feature gate
10750 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10751 standard library's `Gc` or `Rc` types instead.
10752 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10753 * Jumping back to the top of a loop is now done with `continue` instead of
10755 * Strings can no longer be mutated through index assignment.
10756 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10757 hash delimiters, as in `r###"foo"###`.
10758 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10760 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10761 * `@fn`s have been removed.
10762 * `do` only works with procs in order to make it obvious what the cost
10764 * Single-element tuple-like structs can no longer be dereferenced to
10765 obtain the inner value. A more comprehensive solution for overloading
10766 the dereference operator will be provided in the future.
10767 * The `#[link(...)]` attribute has been replaced with
10768 `#[crate_id = "name#vers"]`.
10769 * Empty `impl`s must be terminated with empty braces and may not be
10770 terminated with a semicolon.
10771 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10772 no longer has any special meaning.
10773 * The old `fmt!` string formatting macro has been removed.
10774 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10775 `print!` and `println!`.
10776 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10777 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10778 `extern mod foo = "bar"` instead.
10779 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10780 * Macros can have attributes.
10781 * Macros can expand to items with attributes.
10782 * Macros can expand to multiple items.
10783 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10784 * Comments may be nested.
10785 * Values automatically coerce to trait objects they implement, without
10787 * Enum discriminants are no longer an entire word but as small as needed to
10788 contain all the variants. The `repr` attribute can be used to override
10789 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10790 `#[repr(C)]` to match C enums.
10791 * Non-string literals are not allowed in attributes (they never worked).
10792 * The FFI now supports variadic functions.
10793 * Octal numeric literals, as in `0o7777`.
10794 * The `concat!` syntax extension performs compile-time string concatenation.
10795 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10796 removed as Rust no longer uses segmented stacks.
10797 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10798 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10799 not `*`; ignoring remaining fields of a struct is also done with `..`,
10800 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10801 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10802 * `rustc` supports the "system" calling convention, which defaults to the
10803 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10805 * The `type_overflow` lint (default: warn) checks literals for overflow.
10806 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10807 * The `attribute_usage` lint (default: warn) warns about unknown
10809 * The `unknown_features` lint (default: warn) warns about unknown
10811 * The `dead_code` lint (default: warn) checks for dead code.
10812 * Rust libraries can be linked statically to one another
10813 * `#[link_args]` is behind the `link_args` feature gate.
10814 * Native libraries are now linked with `#[link(name = "foo")]`
10815 * Native libraries can be statically linked to a rust crate
10816 (`#[link(name = "foo", kind = "static")]`).
10817 * Native OS X frameworks are now officially supported
10818 (`#[link(name = "foo", kind = "framework")]`).
10819 * The `#[thread_local]` attribute creates thread-local (not task-local)
10820 variables. Currently behind the `thread_local` feature gate.
10821 * The `return` keyword may be used in closures.
10822 * Types that can be copied via a memcpy implement the `Pod` kind.
10823 * The `cfg` attribute can now be used on struct fields and enum variants.
10826 * std: The `option` and `result` API's have been overhauled to make them
10827 simpler, more consistent, and more composable.
10828 * std: The entire `std::io` module has been replaced with one that is
10829 more comprehensive and that properly interfaces with the underlying
10830 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10832 * std: `io::util` contains a number of useful implementations of
10833 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10834 `ZeroReader`, `TeeReader`.
10835 * std: The reference counted pointer type `extra::rc` moved into std.
10836 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10837 just a wrapper around it).
10838 * std: The `Either` type has been removed.
10839 * std: `fmt::Default` can be implemented for any type to provide default
10840 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10841 * std: The `rand` API continues to be tweaked.
10842 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10843 on failure in gdb, is now named `rust_fail`.
10844 * std: The `each_key` and `each_value` methods on `HashMap` have been
10845 replaced by the `keys` and `values` iterators.
10846 * std: Functions dealing with type size and alignment have moved from the
10847 `sys` module to the `mem` module.
10848 * std: The `path` module was written and API changed.
10849 * std: `str::from_utf8` has been changed to cast instead of allocate.
10850 * std: `starts_with` and `ends_with` methods added to vectors via the
10851 `ImmutableEqVector` trait, which is in the prelude.
10852 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10853 if the index is out of bounds.
10854 * std: Task failure no longer propagates between tasks, as the model was
10855 complex, expensive, and incompatible with thread-based tasks.
10856 * std: The `Any` type can be used for dynamic typing.
10857 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10859 * std: Methods that produce iterators generally do not have an `_iter`
10861 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10862 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10863 * std: `util::ignore` renamed to `prelude::drop`.
10864 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10866 * std: `vec::raw` has seen a lot of cleanup and API changes.
10867 * std: The standard library no longer includes any C++ code, and very
10868 minimal C, eliminating the dependency on libstdc++.
10869 * std: Runtime scheduling and I/O functionality has been factored out into
10870 extensible interfaces and is now implemented by two different crates:
10871 libnative, for native threading and I/O; and libgreen, for green threading
10872 and I/O. This paves the way for using the standard library in more limited
10873 embedded environments.
10874 * std: The `comm` module has been rewritten to be much faster, have a
10875 simpler, more consistent API, and to work for both native and green
10877 * std: All libuv dependencies have been moved into the rustuv crate.
10878 * native: New implementations of runtime scheduling on top of OS threads.
10879 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10881 * green: The green thread scheduler and message passing types are almost
10882 entirely lock-free.
10883 * extra: The `flatpipes` module had bitrotted and was removed.
10884 * extra: All crypto functions have been removed and Rust now has a policy of
10885 not reimplementing crypto in the standard library. In the future crypto
10886 will be provided by external crates with bindings to established libraries.
10887 * extra: `c_vec` has been modernized.
10888 * extra: The `sort` module has been removed. Use the `sort` method on
10892 * The `rust` and `rusti` commands have been removed, due to lack of
10894 * `rustdoc` was completely rewritten.
10895 * `rustdoc` can test code examples in documentation.
10896 * `rustpkg` can test packages with the argument, 'test'.
10897 * `rustpkg` supports arbitrary dependencies, including C libraries.
10898 * `rustc`'s support for generating debug info is improved again.
10899 * `rustc` has better error reporting for unbalanced delimiters.
10900 * `rustc`'s JIT support was removed due to bitrot.
10901 * Executables and static libraries can be built with LTO (-Z lto)
10902 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10906 Version 0.8 (2013-09-26)
10907 ============================
10909 * ~2200 changes, numerous bugfixes
10912 * The `for` loop syntax has changed to work with the `Iterator` trait.
10913 * At long last, unwinding works on Windows.
10914 * Default methods are ready for use.
10915 * Many trait inheritance bugs fixed.
10916 * Owned and borrowed trait objects work more reliably.
10917 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10918 * rustc can omit emission of code for the `debug!` macro if it is passed
10920 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10921 for foo.rs, then foo/mod.rs, and will generate an error when both are
10923 * Strings no longer contain trailing nulls. The new `std::c_str` module
10924 provides new mechanisms for converting to C strings.
10925 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10926 * The FFI has been overhauled such that foreign functions are called directly,
10927 instead of through a stack-switching wrapper.
10928 * Calling a foreign function must be done through a Rust function with the
10929 `#[fixed_stack_segment]` attribute.
10930 * The `externfn!` macro can be used to declare both a foreign function and
10931 a `#[fixed_stack_segment]` wrapper at once.
10932 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10933 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10934 * `priv` is disallowed everywhere except for struct fields and enum variants.
10935 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10936 * `ref` bindings in irrefutable patterns work correctly now.
10937 * `char` is now prevented from containing invalid code points.
10938 * Casting to `bool` is no longer allowed.
10939 * `\0` is now accepted as an escape in chars and strings.
10940 * `yield` is a reserved keyword.
10941 * `typeof` is a reserved keyword.
10942 * Crates may be imported by URL with `extern mod foo = "url";`.
10943 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10944 * Static vectors can be initialized with repeating elements,
10945 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10946 * Static structs can be initialized with functional record update,
10947 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10948 * `cfg!` can be used to conditionally execute code based on the crate
10949 configuration, similarly to `#[cfg(...)]`.
10950 * The `unnecessary_qualification` lint detects unneeded module
10951 prefixes (default: allow).
10952 * Arithmetic operations have been implemented on the SIMD types in
10953 `std::unstable::simd`.
10954 * Exchange allocation headers were removed, reducing memory usage.
10955 * `format!` implements a completely new, extensible, and higher-performance
10956 string formatting system. It will replace `fmt!`.
10957 * `print!` and `println!` write formatted strings (using the `format!`
10958 extension) to stdout.
10959 * `write!` and `writeln!` write formatted strings (using the `format!`
10960 extension) to the new Writers in `std::rt::io`.
10961 * The library section in which a function or static is placed may
10962 be specified with `#[link_section = "..."]`.
10963 * The `proto!` syntax extension for defining bounded message protocols
10965 * `macro_rules!` is hygienic for `let` declarations.
10966 * The `#[export_name]` attribute specifies the name of a symbol.
10967 * `unreachable!` can be used to indicate unreachable code, and fails
10971 * std: Transitioned to the new runtime, written in Rust.
10972 * std: Added an experimental I/O library, `rt::io`, based on the new
10974 * std: A new generic `range` function was added to the prelude, replacing
10975 `uint::range` and friends.
10976 * std: `range_rev` no longer exists. Since range is an iterator it can be
10977 reversed with `range(lo, hi).invert()`.
10978 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10979 renamed to `unwrap_or`.
10980 * std: The `iterator` module was renamed to `iter`.
10981 * std: Integral types now support the `checked_add`, `checked_sub`, and
10982 `checked_mul` operations for detecting overflow.
10983 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10985 * std: Methods are standardizing on conventions for casting methods:
10986 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10988 * std: The `CString` type in `c_str` provides new ways to convert to and
10990 * std: `DoubleEndedIterator` can yield elements in two directions.
10991 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10993 * std: `str::from_bytes` renamed to `str::from_utf8`.
10994 * std: `pop_opt` and `shift_opt` methods added to vectors.
10995 * std: The task-local data interface no longer uses @, and keys are
10996 no longer function pointers.
10997 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10998 * std: Added `SharedPort` to `comm`.
10999 * std: `Eq` has a default method for `ne`; only `eq` is required
11000 in implementations.
11001 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
11002 is required in implementations.
11003 * std: `is_utf8` performance is improved, impacting many string functions.
11004 * std: `os::MemoryMap` provides cross-platform mmap.
11005 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
11006 are not 'in-bounds' are considered undefined.
11007 * std: Many freestanding functions in `vec` removed in favor of methods.
11008 * std: Many freestanding functions on scalar types removed in favor of
11010 * std: Many options to task builders were removed since they don't make
11011 sense in the new scheduler design.
11012 * std: More containers implement `FromIterator` so can be created by the
11014 * std: More complete atomic types in `unstable::atomics`.
11015 * std: `comm::PortSet` removed.
11016 * std: Mutating methods in the `Set` and `Map` traits have been moved into
11017 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
11018 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
11019 default implementations.
11020 * std: Various `from_str` functions were removed in favor of a generic
11021 `from_str` which is available in the prelude.
11022 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
11023 * extra: `dlist`, the doubly-linked list was modernized.
11024 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
11025 * extra: Added `glob` module, replacing `std::os::glob`.
11026 * extra: `rope` was removed.
11027 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
11028 * extra: `net`, and `timer` were removed. The experimental replacements
11029 are `std::rt::io::net` and `std::rt::io::timer`.
11030 * extra: Iterators implemented for `SmallIntMap`.
11031 * extra: Iterators implemented for `Bitv` and `BitvSet`.
11032 * extra: `SmallIntSet` removed. Use `BitvSet`.
11033 * extra: Performance of JSON parsing greatly improved.
11034 * extra: `semver` updated to SemVer 2.0.0.
11035 * extra: `term` handles more terminals correctly.
11036 * extra: `dbg` module removed.
11037 * extra: `par` module removed.
11038 * extra: `future` was cleaned up, with some method renames.
11039 * extra: Most free functions in `getopts` were converted to methods.
11042 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
11043 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
11044 similarly to gcc's `--march` flag.
11045 * rustc's performance compiling small crates is much better.
11046 * rustpkg has received many improvements.
11047 * rustpkg supports git tags as package IDs.
11048 * rustpkg builds into target-specific directories so it can be used for
11050 * The number of concurrent test tasks is controlled by the environment
11051 variable RUST_TEST_TASKS.
11052 * The test harness can now report metrics for benchmarks.
11053 * All tools have man pages.
11054 * Programs compiled with `--test` now support the `-h` and `--help` flags.
11055 * The runtime uses jemalloc for allocations.
11056 * Segmented stacks are temporarily disabled as part of the transition to
11057 the new runtime. Stack overflows are possible!
11058 * A new documentation backend, rustdoc_ng, is available for use. It is
11059 still invoked through the normal `rustdoc` command.
11062 Version 0.7 (2013-07-03)
11063 =======================
11065 * ~2000 changes, numerous bugfixes
11068 * `impl`s no longer accept a visibility qualifier. Put them on methods
11070 * The borrow checker has been rewritten with flow-sensitivity, fixing
11071 many bugs and inconveniences.
11072 * The `self` parameter no longer implicitly means `&'self self`,
11073 and can be explicitly marked with a lifetime.
11074 * Overloadable compound operators (`+=`, etc.) have been temporarily
11075 removed due to bugs.
11076 * The `for` loop protocol now requires `for`-iterators to return `bool`
11077 so they compose better.
11078 * The `Durable` trait is replaced with the `'static` bounds.
11079 * Trait default methods work more often.
11080 * Structs with the `#[packed]` attribute have byte alignment and
11081 no padding between fields.
11082 * Type parameters bound by `Copy` must now be copied explicitly with
11083 the `copy` keyword.
11084 * It is now illegal to move out of a dereferenced unsafe pointer.
11085 * `Option<~T>` is now represented as a nullable pointer.
11086 * `@mut` does dynamic borrow checks correctly.
11087 * The `main` function is only detected at the topmost level of the crate.
11088 The `#[main]` attribute is still valid anywhere.
11089 * Struct fields may no longer be mutable. Use inherited mutability.
11090 * The `#[no_send]` attribute makes a type that would otherwise be
11092 * The `#[no_freeze]` attribute makes a type that would otherwise be
11094 * Unbounded recursion will abort the process after reaching the limit
11095 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
11096 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
11097 are never implicitly copyable.
11098 * `#[static_assert]` makes compile-time assertions about static bools.
11099 * At long last, 'argument modes' no longer exist.
11100 * The rarely used `use mod` statement no longer exists.
11102 * Syntax extensions
11103 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
11105 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
11106 `Rand`, `Zero` and `ToStr` can all be automatically derived with
11107 `#[deriving(...)]`.
11108 * The `bytes!` macro returns a vector of bytes for string, u8, char,
11109 and unsuffixed integer literals.
11112 * The `core` crate was renamed to `std`.
11113 * The `std` crate was renamed to `extra`.
11114 * More and improved documentation.
11115 * std: `iterator` module for external iterator objects.
11116 * Many old-style (internal, higher-order function) iterators replaced by
11117 implementations of `Iterator`.
11118 * std: Many old internal vector and string iterators,
11119 incl. `any`, `all`. removed.
11120 * std: The `finalize` method of `Drop` renamed to `drop`.
11121 * std: The `drop` method now takes `&mut self` instead of `&self`.
11122 * std: The prelude no longer re-exports any modules, only types and traits.
11123 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
11124 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
11125 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
11126 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
11127 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
11128 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
11129 * std: Many types implement `Clone`.
11130 * std: `path` type renamed to `Path`.
11131 * std: `mut` module and `Mut` type removed.
11132 * std: Many standalone functions removed in favor of methods and iterators
11133 in `vec`, `str`. In the future methods will also work as functions.
11134 * std: `reinterpret_cast` removed. Use `transmute`.
11135 * std: ascii string handling in `std::ascii`.
11136 * std: `Rand` is implemented for ~/@.
11137 * std: `run` module for spawning processes overhauled.
11138 * std: Various atomic types added to `unstable::atomic`.
11139 * std: Various types implement `Zero`.
11140 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
11141 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
11142 * std: Added `os::mkdir_recursive`.
11143 * std: Added `os::glob` function performs filesystems globs.
11144 * std: `FuzzyEq` renamed to `ApproxEq`.
11145 * std: `Map` now defines `pop` and `swap` methods.
11146 * std: `Cell` constructors converted to static methods.
11147 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
11148 * extra: `flate` module moved from `std` to `extra`.
11149 * extra: `fileinput` module for iterating over a series of files.
11150 * extra: `Complex` number type and `complex` module.
11151 * extra: `Rational` number type and `rational` module.
11152 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
11153 * extra: `term` uses terminfo now, is more correct.
11154 * extra: `arc` functions converted to methods.
11155 * extra: Implementation of fixed output size variations of SHA-2.
11158 * `unused_variables` lint mode for unused variables (default: warn).
11159 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
11161 * `unused_mut` lint mode for identifying unused `mut` qualifiers
11163 * `dead_assignment` lint mode for unread variables (default: warn).
11164 * `unnecessary_allocation` lint mode detects some heap allocations that are
11165 immediately borrowed so could be written without allocating (default: warn).
11166 * `missing_doc` lint mode (default: allow).
11167 * `unreachable_code` lint mode (default: warn).
11168 * The `rusti` command has been rewritten and a number of bugs addressed.
11169 * rustc outputs in color on more terminals.
11170 * rustc accepts a `--link-args` flag to pass arguments to the linker.
11171 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
11172 * Compiling with `-g` will make the binary record information about
11173 dynamic borrowcheck failures for debugging.
11174 * rustdoc has a nicer stylesheet.
11175 * Various improvements to rustdoc.
11176 * Improvements to rustpkg (see the detailed release notes).
11179 Version 0.6 (2013-04-03)
11180 ========================
11182 * ~2100 changes, numerous bugfixes
11185 * The self type parameter in traits is now spelled `Self`
11186 * The `self` parameter in trait and impl methods must now be explicitly
11187 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
11188 * Static methods no longer require the `static` keyword and instead
11189 are distinguished by the lack of a `self` parameter
11190 * Replaced the `Durable` trait with the `'static` lifetime
11191 * The old closure type syntax with the trailing sigil has been
11192 removed in favor of the more consistent leading sigil
11193 * `super` is a keyword, and may be prefixed to paths
11194 * Trait bounds are separated with `+` instead of whitespace
11195 * Traits are implemented with `impl Trait for Type`
11196 instead of `impl Type: Trait`
11197 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
11198 * The `export` keyword has finally been removed
11199 * The `move` keyword has been removed (see "Semantic changes")
11200 * The interior mutability qualifier on vectors, `[mut T]`, has been
11201 removed. Use `&mut [T]`, etc.
11202 * `mut` is no longer valid in `~mut T`. Use inherited mutability
11203 * `fail` is no longer a keyword. Use `fail!()`
11204 * `assert` is no longer a keyword. Use `assert!()`
11205 * `log` is no longer a keyword. use `debug!`, etc.
11206 * 1-tuples may be represented as `(T,)`
11207 * Struct fields may no longer be `mut`. Use inherited mutability,
11208 `@mut T`, `core::mut` or `core::cell`
11209 * `extern mod { ... }` is no longer valid syntax for foreign
11210 function modules. Use extern blocks: `extern { ... }`
11211 * Newtype enums removed. Use tuple-structs.
11212 * Trait implementations no longer support visibility modifiers
11213 * Pattern matching over vectors improved and expanded
11214 * `const` renamed to `static` to correspond to lifetime name,
11215 and make room for future `static mut` unsafe mutable globals.
11216 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
11217 * `Clone` implementations can be automatically generated with
11218 `#[deriving(Clone)]`
11219 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
11220 instead of `foo as Bar`.
11221 * Fixed length vector types are now written as `[int, .. 3]`
11222 instead of `[int * 3]`.
11223 * Fixed length vector types can express the length as a constant
11224 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
11227 * Types with owned pointers or custom destructors move by default,
11228 eliminating the `move` keyword
11229 * All foreign functions are considered unsafe
11230 * &mut is now unaliasable
11231 * Writes to borrowed @mut pointers are prevented dynamically
11233 * The name of the main function can be customized using #[main]
11234 * The default type of an inferred closure is &fn instead of @fn
11235 * `use` statements may no longer be "chained" - they cannot import
11236 identifiers imported by previous `use` statements
11237 * `use` statements are crate relative, importing from the "top"
11238 of the crate by default. Paths may be prefixed with `super::`
11239 or `self::` to change the search behavior.
11240 * Method visibility is inherited from the implementation declaration
11241 * Structural records have been removed
11242 * Many more types can be used in static items, including enums
11243 'static-lifetime pointers and vectors
11244 * Pattern matching over vectors improved and expanded
11245 * Typechecking of closure types has been overhauled to
11246 improve inference and eliminate unsoundness
11247 * Macros leave scope at the end of modules, unless that module is
11248 tagged with #[macro_escape]
11251 * Added big integers to `std::bigint`
11252 * Removed `core::oldcomm` module
11253 * Added pipe-based `core::comm` module
11254 * Numeric traits have been reorganized under `core::num`
11255 * `vec::slice` finally returns a slice
11256 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
11257 * Containers reorganized around traits in `core::container`
11258 * `core::dvec` removed, `~[T]` is a drop-in replacement
11259 * `core::send_map` renamed to `core::hashmap`
11260 * `std::map` removed; replaced with `core::hashmap`
11261 * `std::treemap` reimplemented as an owned balanced tree
11262 * `std::deque` and `std::smallintmap` reimplemented as owned containers
11263 * `core::trie` added as a fast ordered map for integer keys
11264 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
11265 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
11266 overload the comparison operators, whereas `TotalOrd` is used
11267 by certain container types
11270 * Replaced the 'cargo' package manager with 'rustpkg'
11271 * Added all-purpose 'rust' tool
11272 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
11273 * rustc now *attempts* to offer spelling suggestions
11274 * Improved support for ARM and Android
11275 * Preliminary MIPS backend
11276 * Improved foreign function ABI implementation for x86, x86_64
11277 * Various memory usage improvements
11278 * Rust code may be embedded in foreign code under limited circumstances
11279 * Inline assembler supported by new asm!() syntax extension.
11282 Version 0.5 (2012-12-21)
11283 ===========================
11285 * ~900 changes, numerous bugfixes
11288 * Removed `<-` move operator
11289 * Completed the transition from the `#fmt` extension syntax to `fmt!`
11290 * Removed old fixed length vector syntax - `[T]/N`
11291 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
11292 * Macros may now expand to items and statements
11293 * `a.b()` is always parsed as a method call, never as a field projection
11294 * `Eq` and `IterBytes` implementations can be automatically generated
11295 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
11296 * Removed the special crate language for `.rc` files
11297 * Function arguments may consist of any irrefutable pattern
11300 * `&` and `~` pointers may point to objects
11301 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
11302 * Enum variants may be structs
11303 * Destructors can be added to all nominal types with the Drop trait
11304 * Structs and nullary enum variants may be constants
11305 * Values that cannot be implicitly copied are now automatically moved
11306 without writing `move` explicitly
11307 * `&T` may now be coerced to `*T`
11308 * Coercions happen in `let` statements as well as function calls
11309 * `use` statements now take crate-relative paths
11310 * The module and type namespaces have been merged so that static
11311 method names can be resolved under the trait in which they are
11314 * Improved support for language features
11315 * Trait inheritance works in many scenarios
11316 * More support for explicit self arguments in methods - `self`, `&self`
11317 `@self`, and `~self` all generally work as expected
11318 * Static methods work in more situations
11319 * Experimental: Traits may declare default methods for the implementations
11323 * New condition handling system in `core::condition`
11324 * Timsort added to `std::sort`
11325 * New priority queue, `std::priority_queue`
11326 * Pipes for serializable types, `std::flatpipes'
11327 * Serialization overhauled to be trait-based
11328 * Expanded `getopts` definitions
11329 * Moved futures to `std`
11330 * More functions are pure now
11331 * `core::comm` renamed to `oldcomm`. Still deprecated
11332 * `rustdoc` and `cargo` are libraries now
11335 * Added a preliminary REPL, `rusti`
11336 * License changed from MIT to dual MIT/APL2
11339 Version 0.4 (2012-10-15)
11340 ==========================
11342 * ~2000 changes, numerous bugfixes
11345 * All keywords are now strict and may not be used as identifiers anywhere
11346 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
11347 'of', 'with', 'to', 'class'.
11348 * Classes are replaced with simpler structs
11349 * Explicit method self types
11350 * `ret` became `return` and `alt` became `match`
11351 * `import` is now `use`; `use is now `extern mod`
11352 * `extern mod { ... }` is now `extern { ... }`
11353 * `use mod` is the recommended way to import modules
11354 * `pub` and `priv` replace deprecated export lists
11355 * The syntax of `match` pattern arms now uses fat arrow (=>)
11356 * `main` no longer accepts an args vector; use `os::args` instead
11359 * Trait implementations are now coherent, ala Haskell typeclasses
11360 * Trait methods may be static
11361 * Argument modes are deprecated
11362 * Borrowed pointers are much more mature and recommended for use
11363 * Strings and vectors in the static region are stored in constant memory
11364 * Typestate was removed
11365 * Resolution rewritten to be more reliable
11366 * Support for 'dual-mode' data structures (freezing and thawing)
11369 * Most binary operators can now be overloaded via the traits in
11371 * `std::net::url` for representing URLs
11372 * Sendable hash maps in `core::send_map`
11373 * `core::task' gained a (currently unsafe) task-local storage API
11376 * An efficient new intertask communication primitive called the pipe,
11377 along with a number of higher-level channel types, in `core::pipes`
11378 * `std::arc`, an atomically reference counted, immutable, shared memory
11380 * `std::sync`, various exotic synchronization tools based on arcs and pipes
11381 * Futures are now based on pipes and sendable
11382 * More robust linked task failure
11383 * Improved task builder API
11386 * Improved error reporting
11387 * Preliminary JIT support
11388 * Preliminary work on precise GC
11389 * Extensive architectural improvements to rustc
11390 * Begun a transition away from buggy C++-based reflection (shape) code to
11391 Rust-based (visitor) code
11392 * All hash functions and tables converted to secure, randomized SipHash
11395 Version 0.3 (2012-07-12)
11396 ========================
11398 * ~1900 changes, numerous bugfixes
11400 * New coding conveniences
11401 * Integer-literal suffix inference
11402 * Per-item control over warnings, errors
11403 * #[cfg(windows)] and #[cfg(unix)] attributes
11404 * Documentation comments
11405 * More compact closure syntax
11406 * 'do' expressions for treating higher-order functions as
11408 * *-patterns (wildcard extended to all constructor fields)
11411 * Name resolution pass and exhaustiveness checker rewritten
11412 * Region pointers and borrow checking supersede alias
11414 * Init-ness checking is now provided by a region-based liveness
11415 pass instead of the typestate pass; same for last-use analysis
11416 * Extensive work on region pointers
11418 * Experimental new language features
11419 * Slices and fixed-size, interior-allocated vectors
11420 * #!-comments for lang versioning, shell execution
11421 * Destructors and iface implementation for classes;
11422 type-parameterized classes and class methods
11423 * 'const' type kind for types that can be used to implement
11424 shared-memory concurrency patterns
11428 * Removal of various obsolete features
11429 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11430 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11432 * Constructs: do-while loops ('do' repurposed), fn binding,
11433 resources (replaced by destructors)
11435 * Compiler reorganization
11436 * Syntax-layer of compiler split into separate crate
11437 * Clang (from LLVM project) integrated into build
11438 * Typechecker split into sub-modules
11441 * New time functions
11442 * Extension methods for many built-in types
11443 * Arc: atomic-refcount read-only / exclusive-use shared cells
11444 * Par: parallel map and search routines
11445 * Extensive work on libuv interface
11446 * Much vector code moved to libraries
11447 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11448 #include, #include_str, #include_bin
11450 * Tool improvements
11451 * Cargo automatically resolves dependencies
11454 Version 0.2 (2012-03-29)
11455 =========================
11457 * >1500 changes, numerous bugfixes
11459 * New docs and doc tooling
11461 * New port: FreeBSD x86_64
11463 * Compilation model enhancements
11464 * Generics now specialized, multiply instantiated
11465 * Functions now inlined across separate crates
11467 * Scheduling, stack and threading fixes
11468 * Noticeably improved message-passing performance
11469 * Explicit schedulers
11473 * Experimental new language features
11474 * Operator overloading
11478 * Various language extensions
11479 * C-callback function types: 'crust fn ...'
11480 * Infinite-loop construct: 'loop { ... }'
11481 * Shorten 'mutable' to 'mut'
11482 * Required mutable-local qualifier: 'let mut ...'
11483 * Basic glob-exporting: 'export foo::*;'
11484 * Alt now exhaustive, 'alt check' for runtime-checked
11485 * Block-function form of 'for' loop, with 'break' and 'ret'.
11488 * AST quasi-quote syntax extension
11489 * Revived libuv interface
11490 * New modules: core::{future, iter}, std::arena
11491 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11492 * Extensive cleanup, regularization in libstd, libcore
11495 Version 0.1 (2012-01-20)
11496 ===============================
11498 * Most language features work, including:
11499 * Unique pointers, unique closures, move semantics
11500 * Interface-constrained generics
11501 * Static interface dispatch
11503 * Multithread task scheduling
11504 * Typestate predicates
11505 * Failure unwinding, destructors
11506 * Pattern matching and destructuring assignment
11507 * Lightweight block-lambda syntax
11508 * Preliminary macro-by-example
11510 * Compiler works with the following configurations:
11511 * Linux: x86 and x86_64 hosts and targets
11512 * macOS: x86 and x86_64 hosts and targets
11513 * Windows: x86 hosts and targets
11515 * Cross compilation / multi-target configuration supported.
11517 * Preliminary API-documentation and package-management tools included.
11521 * Documentation is incomplete.
11523 * Performance is below intended target.
11525 * Standard library APIs are subject to extensive change, reorganization.
11527 * Language-level versioning is not yet operational - future code will
11528 break unexpectedly.