1 Version 1.51.0 (2021-03-25)
2 ============================
6 - [You can now parameterize items such as functions, traits, and `struct`s by constant
7 values in addition to by types and lifetimes.][79135] Also known as "const generics"
8 E.g. you can now write the following. Note: Only values of primitive integers,
9 `bool`, or `char` types are currently permitted.
11 struct GenericArray<T, const LENGTH: usize> {
15 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
16 const fn last(&self) -> Option<&T> {
20 Some(&self.inner[LENGTH - 1])
30 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
31 This option controls whether debug information is split across multiple files
32 or packed into a single file. **Note** This option is unstable on other platforms.
33 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
34 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
35 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
36 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
37 - [Rust now uses `inline-asm` for stack probes when used with LLVM 11.0.1+][77885]
39 \* Refer to Rust's [platform support page][forge-platform-support] for more
40 information on Rust's tiered platform support.
45 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
46 - [`str` now implements `AsMut<str>`.][80279]
47 - [`u64` and `u128` now implement `From<char>`.][79502]
48 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
49 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
50 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
51 - [`io::Empty` now implements `io::Seek`.][78044]
52 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
53 `T: ?Sized` types.][80764]
58 - [`Arc::decrement_strong_count`]
59 - [`Arc::increment_strong_count`]
60 - [`Once::call_once_force`]
61 - [`Peekable::next_if_eq`]
62 - [`Peekable::next_if`]
63 - [`Seek::stream_position`]
65 - [`panic::panic_any`]
67 - [`ptr::addr_of_mut!`]
68 - [`slice::fill_with`]
69 - [`slice::split_inclusive_mut`]
70 - [`slice::split_inclusive`]
71 - [`slice::strip_prefix`]
72 - [`slice::strip_suffix`]
73 - [`str::split_inclusive`]
79 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
80 codegen option.][cargo/9112]
81 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
82 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
83 to avoid unifying features of dependencies where that unification could be unwanted.
84 Such as using the same dependency with a `std` feature in a build scripts and
85 proc-macros, while using the `no-std` feature in the final binary. See the
86 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
91 - [Rustdoc will now include documentation for methods available from `Deref` traits.][80653]
92 - [You can now provide a `--default-theme` flag which sets the default theme to use for
93 documentation.][79642]
95 Various improvements to intra-doc links:
97 - [You can link to non-path primitives such as `slice`.][80181]
98 - [You can link to associated items.][74489]
99 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
103 - [You can now pass `--include-ignored` to tests (e.g. with
104 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
109 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
110 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
112 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
113 for the distributed artifacts.][81521]
114 - `armv5te-unknown-linux-gnueabi`
115 - `sparc64-unknown-linux-gnu`
116 - `thumbv7neon-unknown-linux-gnueabihf`
117 - `armv7-unknown-linux-gnueabi`
118 - `x86_64-unknown-linux-gnux32`
123 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
125 [79135]: https://github.com/rust-lang/rust/pull/79135
126 [74489]: https://github.com/rust-lang/rust/pull/74489
127 [76934]: https://github.com/rust-lang/rust/pull/76934
128 [79570]: https://github.com/rust-lang/rust/pull/79570
129 [80181]: https://github.com/rust-lang/rust/pull/80181
130 [79642]: https://github.com/rust-lang/rust/pull/79642
131 [80945]: https://github.com/rust-lang/rust/pull/80945
132 [80279]: https://github.com/rust-lang/rust/pull/80279
133 [80053]: https://github.com/rust-lang/rust/pull/80053
134 [79502]: https://github.com/rust-lang/rust/pull/79502
135 [75180]: https://github.com/rust-lang/rust/pull/75180
136 [79135]: https://github.com/rust-lang/rust/pull/79135
137 [81521]: https://github.com/rust-lang/rust/pull/81521
138 [80968]: https://github.com/rust-lang/rust/pull/80968
139 [80959]: https://github.com/rust-lang/rust/pull/80959
140 [80718]: https://github.com/rust-lang/rust/pull/80718
141 [80653]: https://github.com/rust-lang/rust/pull/80653
142 [80579]: https://github.com/rust-lang/rust/pull/80579
143 [79998]: https://github.com/rust-lang/rust/pull/79998
144 [78044]: https://github.com/rust-lang/rust/pull/78044
145 [81455]: https://github.com/rust-lang/rust/pull/81455
146 [80764]: https://github.com/rust-lang/rust/pull/80764
147 [80749]: https://github.com/rust-lang/rust/pull/80749
148 [80662]: https://github.com/rust-lang/rust/pull/80662
149 [77885]: https://github.com/rust-lang/rust/pull/77885
150 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
151 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
152 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
153 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
154 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
155 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
156 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
157 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
158 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
159 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
160 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
161 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
162 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
163 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
164 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
165 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
166 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
167 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
168 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
169 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
170 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
172 Version 1.50.0 (2021-02-11)
173 ============================
176 -----------------------
177 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
178 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
179 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
182 -----------------------
183 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
184 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
185 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
187 \* Refer to Rust's [platform support page][forge-platform-support] for more
188 information on Rust's tiered platform support.
191 -----------------------
193 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
194 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
195 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
196 This value cannot be a valid file descriptor, and now means `Option<File>` takes
197 up the same amount of space as `File`.
203 - [`btree_map::Entry::or_insert_with_key`]
206 - [`hash_map::Entry::or_insert_with_key`]
210 - [`UnsafeCell::get_mut`]
212 The following previously stable methods are now `const`.
214 - [`IpAddr::is_ipv4`]
215 - [`IpAddr::is_ipv6`]
218 - [`Layout::from_size_align`]
219 - `pow` for all integer types.
220 - `checked_pow` for all integer types.
221 - `saturating_pow` for all integer types.
222 - `wrapping_pow` for all integer types.
223 - `next_power_of_two` for all unsigned integer types.
224 - `checked_power_of_two` for all unsigned integer types.
227 -----------------------
229 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
230 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
231 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
232 contents of that directory for changes.][cargo/8973]
233 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
238 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
239 - [Running tests will now print the total time taken to execute.][75752]
244 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
245 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
246 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
247 unhygenic `macro_rules!` macros.][79472]
248 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
249 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
250 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
251 - [Dropped support for all cloudabi targets.][78439]
252 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
253 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
254 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
256 [74989]: https://github.com/rust-lang/rust/pull/74989
257 [79261]: https://github.com/rust-lang/rust/pull/79261
258 [79896]: https://github.com/rust-lang/rust/pull/79896
259 [79484]: https://github.com/rust-lang/rust/pull/79484
260 [79472]: https://github.com/rust-lang/rust/pull/79472
261 [79270]: https://github.com/rust-lang/rust/pull/79270
262 [79003]: https://github.com/rust-lang/rust/pull/79003
263 [78864]: https://github.com/rust-lang/rust/pull/78864
264 [78636]: https://github.com/rust-lang/rust/pull/78636
265 [78439]: https://github.com/rust-lang/rust/pull/78439
266 [78343]: https://github.com/rust-lang/rust/pull/78343
267 [78296]: https://github.com/rust-lang/rust/pull/78296
268 [78068]: https://github.com/rust-lang/rust/pull/78068
269 [75752]: https://github.com/rust-lang/rust/pull/75752
270 [74699]: https://github.com/rust-lang/rust/pull/74699
271 [78142]: https://github.com/rust-lang/rust/pull/78142
272 [77484]: https://github.com/rust-lang/rust/pull/77484
273 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
274 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
275 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
276 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
277 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
278 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
279 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
280 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
281 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
282 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
283 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
284 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
285 [`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
286 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
287 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
288 [`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
289 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
292 Version 1.49.0 (2020-12-31)
293 ============================
296 -----------------------
298 - [Unions can now implement `Drop`, and you can now have a field in a union
299 with `ManuallyDrop<T>`.][77547]
300 - [You can now cast uninhabited enums to integers.][76199]
301 - [You can now bind by reference and by move in patterns.][76119] This
302 allows you to selectively borrow individual components of a type. E.g.
310 let person = Person {
311 name: String::from("Alice"),
315 // `name` is moved out of person, but `age` is referenced.
316 let Person { name, ref age } = person;
317 println!("{} {}", name, age);
321 -----------------------
323 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
324 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
325 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
326 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
327 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
328 - [Output from threads spawned in tests is now captured.][78227]
329 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
331 \* Refer to Rust's [platform support page][forge-platform-support] for more
332 information on Rust's tiered platform support.
335 -----------------------
337 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
338 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
343 - [`slice::select_nth_unstable`]
344 - [`slice::select_nth_unstable_by`]
345 - [`slice::select_nth_unstable_by_key`]
347 The following previously stable methods are now `const`.
350 - [`Poll::is_pending`]
353 -----------------------
354 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
355 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
356 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
357 variable will be set if the crate being built is one the user selected to build, either
358 with `-p` or through defaults.
359 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
365 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
366 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
367 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
368 Previously such invalid or unused attributes could be ignored.
369 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
370 read [this post about the changes][rustdoc-ws-post] for more details.
371 - [Trait bounds are no longer inferred for associated types.][79904]
375 These changes provide no direct user facing benefits, but represent significant
376 improvements to the internals and overall performance of rustc and
379 - [rustc's internal crates are now compiled using the `initial-exec` Thread
380 Local Storage model.][78201]
381 - [Calculate visibilities once in resolve.][78077]
382 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
383 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
386 [75991]: https://github.com/rust-lang/rust/pull/75991
387 [78951]: https://github.com/rust-lang/rust/pull/78951
388 [78848]: https://github.com/rust-lang/rust/pull/78848
389 [78746]: https://github.com/rust-lang/rust/pull/78746
390 [78376]: https://github.com/rust-lang/rust/pull/78376
391 [78228]: https://github.com/rust-lang/rust/pull/78228
392 [78227]: https://github.com/rust-lang/rust/pull/78227
393 [78201]: https://github.com/rust-lang/rust/pull/78201
394 [78109]: https://github.com/rust-lang/rust/pull/78109
395 [78077]: https://github.com/rust-lang/rust/pull/78077
396 [77997]: https://github.com/rust-lang/rust/pull/77997
397 [77703]: https://github.com/rust-lang/rust/pull/77703
398 [77547]: https://github.com/rust-lang/rust/pull/77547
399 [77015]: https://github.com/rust-lang/rust/pull/77015
400 [76199]: https://github.com/rust-lang/rust/pull/76199
401 [76119]: https://github.com/rust-lang/rust/pull/76119
402 [75914]: https://github.com/rust-lang/rust/pull/75914
403 [79004]: https://github.com/rust-lang/rust/pull/79004
404 [78676]: https://github.com/rust-lang/rust/pull/78676
405 [79904]: https://github.com/rust-lang/rust/issues/79904
406 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
407 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
408 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
409 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
410 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
411 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
412 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
413 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
414 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
415 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
416 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
418 Version 1.48.0 (2020-11-19)
419 ==========================
424 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
425 is still rejected *semantically*, but can now be parsed by procedural macros.
429 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
430 `rustc` whether to link its own C runtime and libraries or to rely on a external
431 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
432 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
433 Note: If you're using cargo you must explicitly pass the `--target` flag.
434 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
436 \* Refer to Rust's [platform support page][forge-platform-support] for more
437 information on Rust's tiered platform support.
441 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
442 and `&Stderr`.][76275]
443 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
444 - [The `matches!` macro now supports having a trailing comma.][74880]
445 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
446 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
450 - [`slice::as_ptr_range`]
451 - [`slice::as_mut_ptr_range`]
452 - [`VecDeque::make_contiguous`]
453 - [`future::pending`]
456 The following previously stable methods are now `const fn`'s:
458 - [`Option::is_some`]
459 - [`Option::is_none`]
464 - [`Ordering::reverse`]
472 - [You can now link to items in `rustdoc` using the intra-doc link
473 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
474 a link to `std::future`'s documentation. See ["Linking to items by
475 name"][intradoc-links] for more information.
476 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
477 when searching through `rustdoc`'s UI.][75740]
481 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
482 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
483 promoted to `'static` lifetime any more inside `const fn`s.
484 - [Associated type bindings on trait objects are now verified to meet the bounds
485 declared on the trait when checking that they implement the trait.][27675]
486 - [When trait bounds on associated types or opaque types are ambiguous, the
487 compiler no longer makes an arbitrary choice on which bound to use.][54121]
488 - [Fixed recursive nonterminals not being expanded in macros during
489 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
490 correctly handling recursive nonterminal tokens.
491 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
492 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
493 in places where they have no effect.][73461]
494 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
495 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
496 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
497 disallow zero-initialization.][71274]
498 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
499 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
500 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
501 see the [`catch_unwind`] documentation for further information.
507 These changes provide no direct user facing benefits, but represent significant
508 improvements to the internals and overall performance of rustc and
511 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
512 You can continue building with `make` by setting `ninja=false` in
514 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
515 - [Made `ensure_sufficient_stack()` non-generic][76680]
517 [78143]: https://github.com/rust-lang/rust/issues/78143
518 [76680]: https://github.com/rust-lang/rust/pull/76680/
519 [76030]: https://github.com/rust-lang/rust/pull/76030/
520 [70212]: https://github.com/rust-lang/rust/pull/70212/
521 [27675]: https://github.com/rust-lang/rust/issues/27675/
522 [54121]: https://github.com/rust-lang/rust/issues/54121/
523 [71274]: https://github.com/rust-lang/rust/pull/71274/
524 [77386]: https://github.com/rust-lang/rust/pull/77386/
525 [77153]: https://github.com/rust-lang/rust/pull/77153/
526 [77055]: https://github.com/rust-lang/rust/pull/77055/
527 [76275]: https://github.com/rust-lang/rust/pull/76275/
528 [76310]: https://github.com/rust-lang/rust/pull/76310/
529 [76420]: https://github.com/rust-lang/rust/pull/76420/
530 [76158]: https://github.com/rust-lang/rust/pull/76158/
531 [75857]: https://github.com/rust-lang/rust/pull/75857/
532 [75585]: https://github.com/rust-lang/rust/pull/75585/
533 [75740]: https://github.com/rust-lang/rust/pull/75740/
534 [75502]: https://github.com/rust-lang/rust/pull/75502/
535 [74880]: https://github.com/rust-lang/rust/pull/74880/
536 [74922]: https://github.com/rust-lang/rust/pull/74922/
537 [74430]: https://github.com/rust-lang/rust/pull/74430/
538 [74194]: https://github.com/rust-lang/rust/pull/74194/
539 [73461]: https://github.com/rust-lang/rust/pull/73461/
540 [73166]: https://github.com/rust-lang/rust/pull/73166/
541 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
542 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
543 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
544 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
545 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
546 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
547 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
548 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
549 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
550 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
551 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
552 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
553 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
554 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
555 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
558 Version 1.47.0 (2020-10-08)
559 ==========================
563 - [Closures will now warn when not used.][74869]
567 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
568 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
570 - [Upgraded to LLVM 11.][73526]
571 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
572 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
573 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
575 \* Refer to Rust's [platform support page][forge-platform-support] for more
576 information on Rust's tiered platform support.
580 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
581 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
582 those of length less than 33.][74060]
583 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
584 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
585 `PartialEq`, and `PartialOrd`.][73583]
590 - [`Range::is_empty`]
591 - [`RangeInclusive::is_empty`]
592 - [`Result::as_deref`]
593 - [`Result::as_deref_mut`]
595 - [`pointer::offset_from`]
599 The following previously stable APIs have now been made const.
601 - [The `new` method for all `NonZero` integers.][73858]
602 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
603 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
604 methods for all integers.][73858]
605 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
606 signed integers.][73858]
607 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
608 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
609 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
610 `is_ascii_control` methods for `char` and `u8`.][73858]
614 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
615 You can override this by setting the following in your `Cargo.toml`.
617 [profile.release.build-override]
620 - [`cargo-help` will now display man pages for commands rather just the
621 `--help` text.][cargo/8456]
622 - [`cargo-metadata` now emits a `test` field indicating if a target has
623 tests enabled.][cargo/8478]
624 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
625 - [`cargo-publish` will now use an alternative registry by default if it's the
626 only registry specified in `package.publish`.][cargo/8571]
630 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
631 type based search.][75366]
632 - [Added the Ayu theme to rustdoc.][71237]
636 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
637 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
638 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
639 help to preserve more span information.][73084] These changes may cause
640 compiliation errors if your macro was unhygenic or didn't correctly handle
642 - [Moved support for the CloudABI target to tier 3.][75568]
643 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
644 - [Added the `rustc-docs` component.][75560] This allows you to install
645 and read the documentation for the compiler internal APIs. (Currently only
646 available for `x86_64-unknown-linux-gnu`.)
651 - [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.
653 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
654 [75048]: https://github.com/rust-lang/rust/pull/75048/
655 [74163]: https://github.com/rust-lang/rust/pull/74163/
656 [71237]: https://github.com/rust-lang/rust/pull/71237/
657 [74869]: https://github.com/rust-lang/rust/pull/74869/
658 [73858]: https://github.com/rust-lang/rust/pull/73858/
659 [75716]: https://github.com/rust-lang/rust/pull/75716/
660 [75908]: https://github.com/rust-lang/rust/pull/75908/
661 [75516]: https://github.com/rust-lang/rust/pull/75516/
662 [75560]: https://github.com/rust-lang/rust/pull/75560/
663 [75568]: https://github.com/rust-lang/rust/pull/75568/
664 [75366]: https://github.com/rust-lang/rust/pull/75366/
665 [75204]: https://github.com/rust-lang/rust/pull/75204/
666 [74650]: https://github.com/rust-lang/rust/pull/74650/
667 [74419]: https://github.com/rust-lang/rust/pull/74419/
668 [73964]: https://github.com/rust-lang/rust/pull/73964/
669 [74021]: https://github.com/rust-lang/rust/pull/74021/
670 [74060]: https://github.com/rust-lang/rust/pull/74060/
671 [73893]: https://github.com/rust-lang/rust/pull/73893/
672 [73526]: https://github.com/rust-lang/rust/pull/73526/
673 [73583]: https://github.com/rust-lang/rust/pull/73583/
674 [73084]: https://github.com/rust-lang/rust/pull/73084/
675 [73197]: https://github.com/rust-lang/rust/pull/73197/
676 [72488]: https://github.com/rust-lang/rust/pull/72488/
677 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
678 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
679 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
680 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
681 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
682 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
683 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
684 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
685 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
686 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
687 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
688 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
689 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
690 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
691 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
694 Version 1.46.0 (2020-08-27)
695 ==========================
699 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
700 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
701 const functions.][73862]
702 - [The `#[track_caller]` attribute can now be added to functions to use the
703 function's caller's location information for panic messages.][72445]
704 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
705 `x.0.0` over `(x.0).0`.
706 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
707 You currently can't use `mem::transmute` in constant functions.
711 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
712 - [Enabled static "Position Independent Executables" by default
713 for `x86_64-unknown-linux-musl`.][70740]
717 - [`mem::forget` is now a `const fn`.][73887]
718 - [`String` now implements `From<char>`.][73466]
719 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
720 integer types.][73032]
721 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
722 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
723 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
724 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
725 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
726 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
731 - [`vec::Drain::as_slice`]
735 Added a number of new environment variables that are now available when
736 compiling your crate.
738 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
739 the specific binary being compiled and the name of the crate.
740 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
741 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
745 - [The target configuration option `abi_blacklist` has been renamed
746 to `unsupported_abis`.][74150] The old name will still continue to work.
747 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
748 This was previously accepted but will become a hard error in a future release.
749 - [Rustc will fail to compile if you have a struct with
750 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
752 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
753 ensure that spans have the correct information, and may cause breakage if you
754 were relying on receiving spans with dummy information.
755 - [The InnoSetup installer for Windows is no longer available.][72569] This was
756 a legacy installer that was replaced by a MSI installer a few years ago but
757 was still being built.
758 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
759 - [Rustc will no longer accept overlapping trait implementations that only
760 differ in how the lifetime was bound.][72493]
761 - [Rustc now correctly relates the lifetime of an existential associated
762 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
763 you to pass a shorter lifetime than expected.
764 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
765 The library will need to be installed for `rustc` to work, even though we
766 expect it to be already available on most systems.
767 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
769 - [Pretty printing of some tokens in procedural macros changed.][75453] The
770 exact output returned by rustc's pretty printing is an unstable
771 implementation detail: we recommend any macro relying on it to switch to a
772 more robust parsing system.
774 [75453]: https://github.com/rust-lang/rust/issues/75453/
775 [74820]: https://github.com/rust-lang/rust/issues/74820/
776 [74420]: https://github.com/rust-lang/rust/issues/74420/
777 [74109]: https://github.com/rust-lang/rust/pull/74109/
778 [74150]: https://github.com/rust-lang/rust/pull/74150/
779 [73862]: https://github.com/rust-lang/rust/pull/73862/
780 [73887]: https://github.com/rust-lang/rust/pull/73887/
781 [73466]: https://github.com/rust-lang/rust/pull/73466/
782 [73516]: https://github.com/rust-lang/rust/pull/73516/
783 [73293]: https://github.com/rust-lang/rust/pull/73293/
784 [73007]: https://github.com/rust-lang/rust/pull/73007/
785 [73032]: https://github.com/rust-lang/rust/pull/73032/
786 [72920]: https://github.com/rust-lang/rust/pull/72920/
787 [72569]: https://github.com/rust-lang/rust/pull/72569/
788 [72583]: https://github.com/rust-lang/rust/pull/72583/
789 [72584]: https://github.com/rust-lang/rust/pull/72584/
790 [72717]: https://github.com/rust-lang/rust/pull/72717/
791 [72437]: https://github.com/rust-lang/rust/pull/72437/
792 [72445]: https://github.com/rust-lang/rust/pull/72445/
793 [72486]: https://github.com/rust-lang/rust/pull/72486/
794 [72493]: https://github.com/rust-lang/rust/pull/72493/
795 [72331]: https://github.com/rust-lang/rust/pull/72331/
796 [71896]: https://github.com/rust-lang/rust/pull/71896/
797 [71660]: https://github.com/rust-lang/rust/pull/71660/
798 [71322]: https://github.com/rust-lang/rust/pull/71322/
799 [70740]: https://github.com/rust-lang/rust/pull/70740/
800 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
801 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
802 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
803 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
804 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
807 Version 1.45.2 (2020-08-03)
808 ==========================
810 * [Fix bindings in tuple struct patterns][74954]
811 * [Fix track_caller integration with trait objects][74784]
813 [74954]: https://github.com/rust-lang/rust/issues/74954
814 [74784]: https://github.com/rust-lang/rust/issues/74784
817 Version 1.45.1 (2020-07-30)
818 ==========================
820 * [Fix const propagation with references.][73613]
821 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
822 * [Avoid spurious implicit region bound.][74509]
823 * [Install clippy on x.py install][74457]
825 [73613]: https://github.com/rust-lang/rust/pull/73613
826 [73078]: https://github.com/rust-lang/rust/issues/73078
827 [74509]: https://github.com/rust-lang/rust/pull/74509
828 [74457]: https://github.com/rust-lang/rust/pull/74457
831 Version 1.45.0 (2020-07-16)
832 ==========================
836 - [Out of range float to int conversions using `as` has been defined as a saturating
837 conversion.][71269] This was previously undefined behaviour, but you can use the
838 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
839 may be desirable in rare performance sensitive situations.
840 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
842 - [Function like procedural macros can now be used in expression, pattern, and statement
843 positions.][68717] This means you can now use a function-like procedural macro
844 anywhere you can use a declarative (`macro_rules!`) macro.
848 - [You can now override individual target features through the `target-feature`
849 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
850 equivalent to `-C target-feature=+avx2,+fma`.
851 - [Added the `force-unwind-tables` flag.][69984] This option allows
852 rustc to always generate unwind tables regardless of panic strategy.
853 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
854 to include LLVM bitcode into generated `rlib`s (this is on by default).
855 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
856 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
857 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
858 - [Upgraded to LLVM 10.][67759]
860 \* Refer to Rust's [platform support page][forge-platform-support] for more
861 information on Rust's tiered platform support.
866 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
868 - [`proc_macro::TokenStream` now implements `Default`.][72234]
869 - [You can now use `char` with
870 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
871 a range of codepoints.][72413] E.g.
872 you can now write the following;
874 for ch in 'a'..='z' {
878 // Prints "abcdefghijklmnopqrstuvwxyz"
880 - [`OsString` now implements `FromStr`.][71662]
881 - [The `saturating_neg` method has been added to all signed integer primitive
882 types, and the `saturating_abs` method has been added for all integer
883 primitive types.][71886]
884 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
885 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
887 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
888 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
889 integer types.][69813]
890 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
891 integer types.][72324]
892 - [The `fetch_update` method has been added to all atomic integer types.][71843]
897 - [`BTreeMap::remove_entry`]
899 - [`rc::Weak::as_ptr`]
900 - [`rc::Weak::from_raw`]
901 - [`rc::Weak::into_raw`]
902 - [`str::strip_prefix`]
903 - [`str::strip_suffix`]
904 - [`sync::Weak::as_ptr`]
905 - [`sync::Weak::from_raw`]
906 - [`sync::Weak::into_raw`]
907 - [`char::UNICODE_VERSION`]
908 - [`Span::resolved_at`]
909 - [`Span::located_at`]
910 - [`Span::mixed_site`]
911 - [`unix::process::CommandExt::arg0`]
916 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
921 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
922 `~~outdated information~~` becomes "~~outdated information~~".
923 - [Added an emoji to Rustdoc's deprecated API message.][72014]
927 - [Trying to self initialize a static value (that is creating a value using
928 itself) is unsound and now causes a compile error.][71140]
929 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
930 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
931 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
932 previously undocumented and not intended for public use. Rustdoc still provides
933 a non-zero exit code on errors.
934 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
935 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
936 flags while cargo is adding `embed-bitcode` itself. The recommended way to
937 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
938 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
942 - [Make clippy a git subtree instead of a git submodule][70655]
943 - [Unify the undo log of all snapshot types][69464]
945 [71848]: https://github.com/rust-lang/rust/issues/71848/
946 [73420]: https://github.com/rust-lang/rust/issues/73420/
947 [72324]: https://github.com/rust-lang/rust/pull/72324/
948 [71843]: https://github.com/rust-lang/rust/pull/71843/
949 [71886]: https://github.com/rust-lang/rust/pull/71886/
950 [72234]: https://github.com/rust-lang/rust/pull/72234/
951 [72239]: https://github.com/rust-lang/rust/pull/72239/
952 [72397]: https://github.com/rust-lang/rust/pull/72397/
953 [72413]: https://github.com/rust-lang/rust/pull/72413/
954 [72014]: https://github.com/rust-lang/rust/pull/72014/
955 [72062]: https://github.com/rust-lang/rust/pull/72062/
956 [72094]: https://github.com/rust-lang/rust/pull/72094/
957 [72133]: https://github.com/rust-lang/rust/pull/72133/
958 [67759]: https://github.com/rust-lang/rust/pull/67759/
959 [71900]: https://github.com/rust-lang/rust/pull/71900/
960 [71928]: https://github.com/rust-lang/rust/pull/71928/
961 [71662]: https://github.com/rust-lang/rust/pull/71662/
962 [71716]: https://github.com/rust-lang/rust/pull/71716/
963 [71447]: https://github.com/rust-lang/rust/pull/71447/
964 [71269]: https://github.com/rust-lang/rust/pull/71269/
965 [71095]: https://github.com/rust-lang/rust/pull/71095/
966 [71140]: https://github.com/rust-lang/rust/pull/71140/
967 [70655]: https://github.com/rust-lang/rust/pull/70655/
968 [70705]: https://github.com/rust-lang/rust/pull/70705/
969 [69984]: https://github.com/rust-lang/rust/pull/69984/
970 [69813]: https://github.com/rust-lang/rust/pull/69813/
971 [69464]: https://github.com/rust-lang/rust/pull/69464/
972 [68717]: https://github.com/rust-lang/rust/pull/68717/
973 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
974 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
975 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
976 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
977 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
978 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
979 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
980 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
981 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
982 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
983 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
984 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
985 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
986 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
987 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
988 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
989 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
992 Version 1.44.1 (2020-06-18)
993 ===========================
995 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
996 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
997 * [Fix crashes when finding backtrace on macOS.][71397]
998 * [Clippy applies lint levels into different files.][clippy/5356]
1000 [71397]: https://github.com/rust-lang/rust/issues/71397
1001 [73078]: https://github.com/rust-lang/rust/issues/73078
1002 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
1003 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
1006 Version 1.44.0 (2020-06-04)
1007 ==========================
1011 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1012 - [Added the `unused_braces` lint.][70081]
1014 **Syntax-only changes**
1016 - [Expansion-driven outline module parsing][69838]
1021 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1026 These are still rejected semantically, so you will likely receive an error but
1027 these changes can be seen and parsed by macros and conditional compilation.
1031 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
1032 Additionally when in incremental mode rustc defaults to 256 codegen units.
1033 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
1034 a panic is thrown.][67502]
1035 - [Added tier 3\* support for the `aarch64-unknown-none` and
1036 `aarch64-unknown-none-softfloat` targets.][68334]
1037 - [Added tier 3 support for `arm64-apple-tvos` and
1038 `x86_64-apple-tvos` targets.][68191]
1043 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
1044 `vec![]` to be able to be used in `const` contexts.
1045 - [`convert::Infallible` now implements `Hash`.][70281]
1046 - [`OsString` now implements `DerefMut` and `IndexMut` returning
1047 a `&mut OsStr`.][70048]
1048 - [Unicode 13 is now supported.][69929]
1049 - [`String` now implements `From<&mut str>`.][69661]
1050 - [`IoSlice` now implements `Copy`.][69403]
1051 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
1052 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
1053 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
1054 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
1055 integer types.][69373]
1059 - [`PathBuf::with_capacity`]
1060 - [`PathBuf::capacity`]
1061 - [`PathBuf::clear`]
1062 - [`PathBuf::reserve`]
1063 - [`PathBuf::reserve_exact`]
1064 - [`PathBuf::shrink_to_fit`]
1065 - [`f32::to_int_unchecked`]
1066 - [`f64::to_int_unchecked`]
1067 - [`Layout::align_to`]
1068 - [`Layout::pad_to_align`]
1070 - [`Layout::extend`]
1074 - [Added the `cargo tree` command which will print a tree graph of
1075 your dependencies.][cargo/8062] E.g.
1077 mdbook v0.3.2 (/Users/src/rust/mdbook)
1079 │ ├── html5ever v0.24.0
1081 │ │ │ └── cfg-if v0.1.9
1083 │ │ └── markup5ever v0.9.0
1084 │ │ ├── log v0.4.8 (*)
1086 │ │ │ └── phf_shared v0.7.24
1087 │ │ │ ├── siphasher v0.2.3
1088 │ │ │ └── unicase v1.4.2
1089 │ │ │ [build-dependencies]
1090 │ │ │ └── version_check v0.1.5
1093 You can also display dependencies on multiple versions of the same crate with
1094 `cargo tree -d` (short for `cargo tree --duplicates`).
1098 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1099 the version in the sidebar.][69494]
1103 - [Rustc now correctly generates static libraries on Windows GNU targets with
1104 the `.a` extension, rather than the previous `.lib`.][70937]
1105 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
1106 - [The `file_name` property in JSON output of macro errors now points the actual
1107 source file rather than the previous format of `<NAME macros>`.][70969]
1108 **Note:** this may not point to a file that actually exists on the user's system.
1109 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
1110 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
1111 not allow zero initialization such as `NonZeroU8`.][66059] This was
1112 previously a warning.
1113 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
1114 operator has been defined as a saturating operation.][71269] This was previously
1115 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
1116 continue using the current behaviour, which may be desirable in rare performance
1117 sensitive situations.
1121 These changes provide no direct user facing benefits, but represent significant
1122 improvements to the internals and overall performance of rustc and
1125 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1126 - [Replace big JS dict with JSON parsing.][71250]
1128 [69373]: https://github.com/rust-lang/rust/pull/69373/
1129 [66059]: https://github.com/rust-lang/rust/pull/66059/
1130 [68191]: https://github.com/rust-lang/rust/pull/68191/
1131 [68899]: https://github.com/rust-lang/rust/pull/68899/
1132 [71147]: https://github.com/rust-lang/rust/pull/71147/
1133 [71250]: https://github.com/rust-lang/rust/pull/71250/
1134 [70937]: https://github.com/rust-lang/rust/pull/70937/
1135 [70969]: https://github.com/rust-lang/rust/pull/70969/
1136 [70632]: https://github.com/rust-lang/rust/pull/70632/
1137 [70281]: https://github.com/rust-lang/rust/pull/70281/
1138 [70345]: https://github.com/rust-lang/rust/pull/70345/
1139 [70048]: https://github.com/rust-lang/rust/pull/70048/
1140 [70081]: https://github.com/rust-lang/rust/pull/70081/
1141 [70156]: https://github.com/rust-lang/rust/pull/70156/
1142 [71269]: https://github.com/rust-lang/rust/pull/71269/
1143 [69838]: https://github.com/rust-lang/rust/pull/69838/
1144 [69929]: https://github.com/rust-lang/rust/pull/69929/
1145 [69661]: https://github.com/rust-lang/rust/pull/69661/
1146 [69778]: https://github.com/rust-lang/rust/pull/69778/
1147 [69494]: https://github.com/rust-lang/rust/pull/69494/
1148 [69403]: https://github.com/rust-lang/rust/pull/69403/
1149 [69033]: https://github.com/rust-lang/rust/pull/69033/
1150 [68692]: https://github.com/rust-lang/rust/pull/68692/
1151 [68334]: https://github.com/rust-lang/rust/pull/68334/
1152 [67502]: https://github.com/rust-lang/rust/pull/67502/
1153 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
1154 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
1155 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
1156 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
1157 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
1158 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
1159 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
1160 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
1161 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
1162 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
1163 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
1164 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
1165 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
1168 Version 1.43.1 (2020-05-07)
1169 ===========================
1171 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
1172 * [Fixed the stabilization of AVX-512 features.][71473]
1173 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
1175 [71430]: https://github.com/rust-lang/rust/pull/71430
1176 [71473]: https://github.com/rust-lang/rust/issues/71473
1177 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
1180 Version 1.43.0 (2020-04-23)
1181 ==========================
1185 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
1186 the type inferred correctly.][68129]
1187 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
1189 **Syntax only changes**
1190 - [Allow `type Foo: Ord` syntactically.][69361]
1191 - [Fuse associated and extern items up to defaultness.][69194]
1192 - [Syntactically allow `self` in all `fn` contexts.][68764]
1193 - [Merge `fn` syntax + cleanup item parsing.][68728]
1194 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
1195 For example, you may now write:
1197 macro_rules! mac_trait {
1207 These are still rejected *semantically*, so you will likely receive an error but
1208 these changes can be seen and parsed by macros and
1209 conditional compilation.
1214 - [You can now pass multiple lint flags to rustc to override the previous
1215 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
1216 everything in the `unused` lint group except `unused-variables` which
1217 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
1218 everything in the `unused` lint group **including** `unused-variables` since
1219 the allow flag is specified before the deny flag (and therefore overridden).
1220 - [rustc will now prefer your system MinGW libraries over its bundled libraries
1221 if they are available on `windows-gnu`.][67429]
1222 - [rustc now buffers errors/warnings printed in JSON.][69227]
1226 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
1227 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
1228 respectively.][69538] **Note** These conversions are only available when `N`
1230 - [You can now use associated constants on floats and integers directly, rather
1231 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
1232 `f32::NAN` with no imports.
1233 - [`u8::is_ascii` is now `const`.][68984]
1234 - [`String` now implements `AsMut<str>`.][68742]
1235 - [Added the `primitive` module to `std` and `core`.][67637] This module
1236 reexports Rust's primitive types. This is mainly useful in macros
1237 where you want avoid these types being shadowed.
1238 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
1239 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
1243 - [`Once::is_completed`]
1248 - [`iter::once_with`]
1252 - [You can now set config `[profile]`s in your `.cargo/config`, or through
1253 your environment.][cargo/7823]
1254 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
1255 executable path when running integration tests or benchmarks.][cargo/7697]
1256 `<name>` is the name of your binary as-is e.g. If you wanted the executable
1257 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
1261 - [Certain checks in the `const_err` lint were deemed unrelated to const
1262 evaluation][69185], and have been moved to the `unconditional_panic` and
1263 `arithmetic_overflow` lints.
1268 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
1269 has been a warning since 1.36.0.
1270 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
1271 led to some instances being accepted, and now correctly emits a hard error.
1273 [69340]: https://github.com/rust-lang/rust/pull/69340
1277 These changes provide no direct user facing benefits, but represent significant
1278 improvements to the internals and overall performance of `rustc` and
1281 - [All components are now built with `opt-level=3` instead of `2`.][67878]
1282 - [Improved how rustc generates drop code.][67332]
1283 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
1284 - [traits: preallocate 2 Vecs of known initial size][69022]
1285 - [Avoid exponential behaviour when relating types][68772]
1286 - [Skip `Drop` terminators for enum variants without drop glue][68943]
1287 - [Improve performance of coherence checks][68966]
1288 - [Deduplicate types in the generator witness][68672]
1289 - [Invert control in struct_lint_level.][68725]
1291 [67332]: https://github.com/rust-lang/rust/pull/67332/
1292 [67429]: https://github.com/rust-lang/rust/pull/67429/
1293 [67637]: https://github.com/rust-lang/rust/pull/67637/
1294 [67642]: https://github.com/rust-lang/rust/pull/67642/
1295 [67878]: https://github.com/rust-lang/rust/pull/67878/
1296 [67885]: https://github.com/rust-lang/rust/pull/67885/
1297 [68129]: https://github.com/rust-lang/rust/pull/68129/
1298 [68672]: https://github.com/rust-lang/rust/pull/68672/
1299 [68725]: https://github.com/rust-lang/rust/pull/68725/
1300 [68728]: https://github.com/rust-lang/rust/pull/68728/
1301 [68738]: https://github.com/rust-lang/rust/pull/68738/
1302 [68742]: https://github.com/rust-lang/rust/pull/68742/
1303 [68764]: https://github.com/rust-lang/rust/pull/68764/
1304 [68772]: https://github.com/rust-lang/rust/pull/68772/
1305 [68943]: https://github.com/rust-lang/rust/pull/68943/
1306 [68952]: https://github.com/rust-lang/rust/pull/68952/
1307 [68966]: https://github.com/rust-lang/rust/pull/68966/
1308 [68984]: https://github.com/rust-lang/rust/pull/68984/
1309 [69022]: https://github.com/rust-lang/rust/pull/69022/
1310 [69185]: https://github.com/rust-lang/rust/pull/69185/
1311 [69194]: https://github.com/rust-lang/rust/pull/69194/
1312 [69201]: https://github.com/rust-lang/rust/pull/69201/
1313 [69227]: https://github.com/rust-lang/rust/pull/69227/
1314 [69548]: https://github.com/rust-lang/rust/pull/69548/
1315 [69256]: https://github.com/rust-lang/rust/pull/69256/
1316 [69361]: https://github.com/rust-lang/rust/pull/69361/
1317 [69366]: https://github.com/rust-lang/rust/pull/69366/
1318 [69538]: https://github.com/rust-lang/rust/pull/69538/
1319 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
1320 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
1321 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
1322 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
1323 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
1324 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
1325 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
1326 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
1329 Version 1.42.0 (2020-03-12)
1330 ==========================
1334 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
1336 fn foo(words: &[&str]) {
1338 ["Hello", "World", "!", ..] => println!("Hello World!"),
1339 ["Foo", "Bar", ..] => println!("Baz"),
1340 rest => println!("{:?}", rest),
1344 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
1345 that you can create an enum that has the exact layout and ABI of the type
1347 - [There are some *syntax-only* changes:][67131]
1348 - `default` is syntactically allowed before items in `trait` definitions.
1349 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
1350 leave out their bodies in favor of `;`.
1351 - Bounds on associated types in `impl`s are now syntactically allowed
1352 (e.g. `type Foo: Ord;`).
1353 - `...` (the C-variadic type) may occur syntactically directly as the type of
1354 any function parameter.
1356 These are still rejected *semantically*, so you will likely receive an error
1357 but these changes can be seen and parsed by procedural macros and
1358 conditional compilation.
1362 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
1363 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
1364 - [`Option::{expect,unwrap}` and
1365 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
1366 pointing to the location where they were called, rather than
1367 `core`'s internals. ][67887]
1369 \* Refer to Rust's [platform support page][forge-platform-support] for more
1370 information on Rust's tiered platform support.
1374 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
1375 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
1376 to implement `Sized`.][67935]
1377 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
1378 - [`Layout::new` is now `const`.][66254]
1379 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
1384 - [`CondVar::wait_while`]
1385 - [`CondVar::wait_timeout_while`]
1387 - [`DebugMap::value`]
1388 - [`ManuallyDrop::take`]
1390 - [`ptr::slice_from_raw_parts_mut`]
1391 - [`ptr::slice_from_raw_parts`]
1395 - [You no longer need to include `extern crate proc_macro;` to be able to
1396 `use proc_macro;` in the `2018` edition.][cargo/7700]
1400 - [`Error::description` has been deprecated, and its use will now produce a
1401 warning.][66919] It's recommended to use `Display`/`to_string` instead.
1403 [68253]: https://github.com/rust-lang/rust/pull/68253/
1404 [68348]: https://github.com/rust-lang/rust/pull/68348/
1405 [67935]: https://github.com/rust-lang/rust/pull/67935/
1406 [68339]: https://github.com/rust-lang/rust/pull/68339/
1407 [68122]: https://github.com/rust-lang/rust/pull/68122/
1408 [67712]: https://github.com/rust-lang/rust/pull/67712/
1409 [67887]: https://github.com/rust-lang/rust/pull/67887/
1410 [67131]: https://github.com/rust-lang/rust/pull/67131/
1411 [67233]: https://github.com/rust-lang/rust/pull/67233/
1412 [66899]: https://github.com/rust-lang/rust/pull/66899/
1413 [66919]: https://github.com/rust-lang/rust/pull/66919/
1414 [66254]: https://github.com/rust-lang/rust/pull/66254/
1415 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
1416 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1417 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1418 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1419 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1420 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1421 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1422 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1423 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1426 Version 1.41.1 (2020-02-27)
1427 ===========================
1429 * [Always check types of static items][69145]
1430 * [Always check lifetime bounds of `Copy` impls][69145]
1431 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1433 [69225]: https://github.com/rust-lang/rust/issues/69225
1434 [69145]: https://github.com/rust-lang/rust/pull/69145
1437 Version 1.41.0 (2020-01-30)
1438 ===========================
1443 - [You can now pass type parameters to foreign items when implementing
1444 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1445 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1446 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1447 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1448 - [You can now use any valid identifier in a `format_args` macro.][66847]
1449 Previously identifiers starting with an underscore were not allowed.
1450 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1451 enum variants.][66183] These are still rejected semantically, but
1452 can be seen and parsed by procedural macros and conditional compilation.
1457 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1458 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1459 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1460 - [You can now pass an arguments file passing the `@path` syntax
1461 to rustc.][66172] Note that the format differs somewhat from what is
1462 found in other tooling; please see [the documentation][argfile-docs] for
1464 - [You can now provide `--extern` flag without a path, indicating that it is
1465 available from the search path or specified with an `-L` flag.][64882]
1467 \* Refer to Rust's [platform support page][forge-platform-support] for more
1468 information on Rust's tiered platform support.
1470 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1475 - [The `core::panic` module is now stable.][66771] It was already stable
1477 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1478 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1479 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1484 - [`Result::map_or`]
1485 - [`Result::map_or_else`]
1486 - [`std::rc::Weak::weak_count`]
1487 - [`std::rc::Weak::strong_count`]
1488 - [`std::sync::Weak::weak_count`]
1489 - [`std::sync::Weak::strong_count`]
1494 - [Cargo will now document all the private items for binary crates
1495 by default.][cargo/7593]
1496 - [`cargo-install` will now reinstall the package if it detects that it is out
1497 of date.][cargo/7560]
1498 - [Cargo.lock now uses a more git friendly format that should help to reduce
1499 merge conflicts.][cargo/7579]
1500 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1501 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1502 optimisation level to `2` for debug builds. You can also use
1503 `[profile.<profile>.build-override]` to override build scripts and
1509 - [You can now specify `edition` in documentation code blocks to compile the block
1510 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1511 should be compiled the 2018 edition of Rust.
1512 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1513 current theme with `--check-theme`.][54733]
1514 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1519 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1520 Apple targets.][apple-32bit-drop] This means that the source code is still
1521 available to build, but the targets are no longer being tested and release
1522 binaries for those platforms will no longer be distributed by the Rust project.
1523 Please refer to the linked blog post for more information.
1525 [54733]: https://github.com/rust-lang/rust/pull/54733/
1526 [61351]: https://github.com/rust-lang/rust/pull/61351/
1527 [67255]: https://github.com/rust-lang/rust/pull/67255/
1528 [66661]: https://github.com/rust-lang/rust/pull/66661/
1529 [66771]: https://github.com/rust-lang/rust/pull/66771/
1530 [66847]: https://github.com/rust-lang/rust/pull/66847/
1531 [66238]: https://github.com/rust-lang/rust/pull/66238/
1532 [66277]: https://github.com/rust-lang/rust/pull/66277/
1533 [66325]: https://github.com/rust-lang/rust/pull/66325/
1534 [66172]: https://github.com/rust-lang/rust/pull/66172/
1535 [66183]: https://github.com/rust-lang/rust/pull/66183/
1536 [65879]: https://github.com/rust-lang/rust/pull/65879/
1537 [65013]: https://github.com/rust-lang/rust/pull/65013/
1538 [64882]: https://github.com/rust-lang/rust/pull/64882/
1539 [64325]: https://github.com/rust-lang/rust/pull/64325/
1540 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1541 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1542 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1543 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1544 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1545 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1546 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1547 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1548 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1549 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1550 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1552 Version 1.40.0 (2019-12-19)
1553 ===========================
1557 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1558 `const` contexts.][65188] e.g.
1561 pub struct Point(i32, i32);
1563 const ORIGIN: Point = {
1564 let constructor = Point;
1570 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1571 indicate that there may be variants or fields added in the future.][64639]
1572 For example this requires adding a wild-card branch (`_ => {}`) to any match
1573 statements on a non-exhaustive `enum`. [(RFC 2008)]
1574 - [You can now use function-like procedural macros in `extern` blocks and in
1575 type positions.][63931] e.g. `type Generated = macro!();`
1576 - [Function-like and attribute procedural macros can now emit
1577 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1578 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1579 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1580 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1584 - [Added tier 3 support\* for the
1585 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1586 - [Added tier 3 support for the
1587 `aarch64-unknown-none-softfloat` target.][64589]
1588 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1589 `mips64el-unknown-linux-muslabi64` targets.][65843]
1591 \* Refer to Rust's [platform support page][forge-platform-support] for more
1592 information on Rust's tiered platform support.
1596 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1600 - [`BTreeMap::get_key_value`]
1601 - [`HashMap::get_key_value`]
1602 - [`Option::as_deref_mut`]
1603 - [`Option::as_deref`]
1604 - [`Option::flatten`]
1605 - [`UdpSocket::peer_addr`]
1606 - [`f32::to_be_bytes`]
1607 - [`f32::to_le_bytes`]
1608 - [`f32::to_ne_bytes`]
1609 - [`f64::to_be_bytes`]
1610 - [`f64::to_le_bytes`]
1611 - [`f64::to_ne_bytes`]
1612 - [`f32::from_be_bytes`]
1613 - [`f32::from_le_bytes`]
1614 - [`f32::from_ne_bytes`]
1615 - [`f64::from_be_bytes`]
1616 - [`f64::from_le_bytes`]
1617 - [`f64::from_ne_bytes`]
1624 - [Cargo will now always display warnings, rather than only on
1625 fresh builds.][cargo/7450]
1626 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1627 now produce an error.][cargo/7507] Previously these flags were ignored.
1628 - [You can now publish `dev-dependencies` without including
1629 a `version`.][cargo/7333]
1633 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1634 when running documentation tests with `rustdoc`.][63803]
1638 - [As previously announced, any previous NLL warnings in the 2015 edition are
1639 now hard errors.][64221]
1640 - [The `include!` macro will now warn if it failed to include the
1641 entire file.][64284] The `include!` macro unintentionally only includes the
1642 first _expression_ in a file, and this can be unintuitive. This will become
1643 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1644 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1645 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1646 or `extern` blocks now correctly emits a hard error.
1648 [65294]: https://github.com/rust-lang/rust/pull/65294/
1649 [66103]: https://github.com/rust-lang/rust/pull/66103/
1650 [65843]: https://github.com/rust-lang/rust/pull/65843/
1651 [65188]: https://github.com/rust-lang/rust/pull/65188/
1652 [65092]: https://github.com/rust-lang/rust/pull/65092/
1653 [64589]: https://github.com/rust-lang/rust/pull/64589/
1654 [64639]: https://github.com/rust-lang/rust/pull/64639/
1655 [64221]: https://github.com/rust-lang/rust/pull/64221/
1656 [64284]: https://github.com/rust-lang/rust/pull/64284/
1657 [63931]: https://github.com/rust-lang/rust/pull/63931/
1658 [64035]: https://github.com/rust-lang/rust/pull/64035/
1659 [63674]: https://github.com/rust-lang/rust/pull/63674/
1660 [63803]: https://github.com/rust-lang/rust/pull/63803/
1661 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1662 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1663 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1664 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1665 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1666 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1667 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1668 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1669 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1670 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1671 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1672 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1673 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1674 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1675 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1676 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1677 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1678 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1679 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1680 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1681 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1682 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1683 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1684 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1685 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1686 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1689 Version 1.39.0 (2019-11-07)
1690 ===========================
1694 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1695 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1696 - [You can now use certain attributes on function, closure, and function pointer
1697 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1698 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1699 attributes applied to items. e.g.
1702 #[cfg(windows)] slice: &[u16],
1703 #[cfg(not(windows))] slice: &[u8],
1708 - [You can now take shared references to bind-by-move patterns in the `if` guards
1709 of `match` arms.][63118] e.g.
1712 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1716 // ---- `nums` is bound by move.
1717 if nums.iter().sum::<u8>() == 10
1718 // ^------ `.iter()` implicitly takes a reference to `nums`.
1721 // ----------- Legal as `nums` was bound by move and so we have ownership.
1723 _ => unreachable!(),
1732 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1733 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1734 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1735 **Note** Cargo currently doesn't use this feature. Refer to
1736 [cargo#7315][cargo/7315] to track this feature's progress.
1737 - [You can now pass `--show-output` argument to test binaries to print the
1738 output of successful tests.][62600]
1741 \* Refer to Rust's [platform support page][forge-platform-support] for more
1742 information on Rust's tiered platform support.
1746 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1747 - [`LinkedList::new` is now a `const` function.][63684]
1748 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1749 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1750 now `const`.][63786]
1754 - [`Pin::into_inner`]
1755 - [`Instant::checked_duration_since`]
1756 - [`Instant::saturating_duration_since`]
1760 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1761 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1762 `--all` is now deprecated.
1766 - [You can now pass `-Clinker` to rustdoc to control the linker used
1767 for compiling doctests.][63834]
1771 - [Code that was previously accepted by the old borrow checker, but rejected by
1772 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1773 previously a warning, and will also become a hard error in the Rust 2015
1774 edition in the 1.40.0 release.
1775 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1776 run tests.][63827] This should improve performance when running a large
1778 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1779 recommended to use the `?` operator instead.
1780 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1783 [62600]: https://github.com/rust-lang/rust/pull/62600/
1784 [62672]: https://github.com/rust-lang/rust/pull/62672/
1785 [63118]: https://github.com/rust-lang/rust/pull/63118/
1786 [63209]: https://github.com/rust-lang/rust/pull/63209/
1787 [63402]: https://github.com/rust-lang/rust/pull/63402/
1788 [63565]: https://github.com/rust-lang/rust/pull/63565/
1789 [63595]: https://github.com/rust-lang/rust/pull/63595/
1790 [63684]: https://github.com/rust-lang/rust/pull/63684/
1791 [63698]: https://github.com/rust-lang/rust/pull/63698/
1792 [63770]: https://github.com/rust-lang/rust/pull/63770/
1793 [63786]: https://github.com/rust-lang/rust/pull/63786/
1794 [63827]: https://github.com/rust-lang/rust/pull/63827/
1795 [63834]: https://github.com/rust-lang/rust/pull/63834/
1796 [63927]: https://github.com/rust-lang/rust/pull/63927/
1797 [63933]: https://github.com/rust-lang/rust/pull/63933/
1798 [63934]: https://github.com/rust-lang/rust/pull/63934/
1799 [63938]: https://github.com/rust-lang/rust/pull/63938/
1800 [63940]: https://github.com/rust-lang/rust/pull/63940/
1801 [63941]: https://github.com/rust-lang/rust/pull/63941/
1802 [63945]: https://github.com/rust-lang/rust/pull/63945/
1803 [64010]: https://github.com/rust-lang/rust/pull/64010/
1804 [64028]: https://github.com/rust-lang/rust/pull/64028/
1805 [64334]: https://github.com/rust-lang/rust/pull/64334/
1806 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1807 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1808 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1809 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1810 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1811 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1813 Version 1.38.0 (2019-09-26)
1814 ==========================
1818 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1819 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1823 - [Added pipelined compilation support to `rustc`.][62766] This will
1824 improve compilation times in some cases. For further information please refer
1825 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1826 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1827 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1828 `x86_64-uwp-windows-msvc` targets.][60260]
1829 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1830 `armv7-unknown-linux-musleabi` targets.][63107]
1831 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1832 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1833 - [Upgraded to LLVM 9.][62592]
1835 \* Refer to Rust's [platform support page][forge-platform-support] for more
1836 information on Rust's tiered platform support.
1840 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1841 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1842 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1843 is available at `std::clone::Clone`). This also makes all built-in macros
1844 available in `std`/`core` root. e.g. `std::include_bytes!`.
1845 - [`str::Chars` now implements `Debug`.][63000]
1846 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1847 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1848 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1849 - [Added euclidean remainder and division operations (`div_euclid`,
1850 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1851 `overflowing`, and `wrapping` versions are available for all
1853 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1854 `PartialEq`.][61491]
1855 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1859 - [`<*const T>::cast`]
1860 - [`<*mut T>::cast`]
1861 - [`Duration::as_secs_f32`]
1862 - [`Duration::as_secs_f64`]
1863 - [`Duration::div_f32`]
1864 - [`Duration::div_f64`]
1865 - [`Duration::from_secs_f32`]
1866 - [`Duration::from_secs_f64`]
1867 - [`Duration::mul_f32`]
1868 - [`Duration::mul_f64`]
1869 - [`any::type_name`]
1873 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1874 - [You can now pass the `--features` option multiple times to enable
1875 multiple features.][cargo/7084]
1879 - [`rustc` will now warn about some incorrect uses of
1880 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1884 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1886 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1887 issues][62896] with certain crates such as libc.
1889 [60260]: https://github.com/rust-lang/rust/pull/60260/
1890 [61457]: https://github.com/rust-lang/rust/pull/61457/
1891 [61491]: https://github.com/rust-lang/rust/pull/61491/
1892 [61884]: https://github.com/rust-lang/rust/pull/61884/
1893 [61953]: https://github.com/rust-lang/rust/pull/61953/
1894 [62042]: https://github.com/rust-lang/rust/pull/62042/
1895 [62528]: https://github.com/rust-lang/rust/pull/62528/
1896 [62583]: https://github.com/rust-lang/rust/pull/62583/
1897 [62735]: https://github.com/rust-lang/rust/pull/62735/
1898 [62766]: https://github.com/rust-lang/rust/pull/62766/
1899 [62784]: https://github.com/rust-lang/rust/pull/62784/
1900 [62592]: https://github.com/rust-lang/rust/pull/62592/
1901 [62785]: https://github.com/rust-lang/rust/issues/62785/
1902 [62814]: https://github.com/rust-lang/rust/pull/62814/
1903 [62896]: https://github.com/rust-lang/rust/issues/62896/
1904 [63000]: https://github.com/rust-lang/rust/pull/63000/
1905 [63056]: https://github.com/rust-lang/rust/pull/63056/
1906 [63107]: https://github.com/rust-lang/rust/pull/63107/
1907 [63346]: https://github.com/rust-lang/rust/pull/63346/
1908 [63421]: https://github.com/rust-lang/rust/pull/63421/
1909 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1910 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1911 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1912 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1913 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1914 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1915 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1916 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1917 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1918 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1919 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1920 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1921 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1922 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1923 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1925 Version 1.37.0 (2019-08-15)
1926 ==========================
1930 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1931 [`Box`][62228], or an [array][62235] and unused.
1932 - [You can now use the `cfg` and `cfg_attr` attributes on
1933 generic parameters.][61547]
1934 - [You can now use enum variants through type alias.][61682] e.g. You can
1935 write the following:
1937 type MyOption = Option<u8>;
1939 fn increment_or_zero(x: MyOption) -> u8 {
1941 MyOption::Some(y) => y + 1,
1942 MyOption::None => 0,
1946 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1947 `const _: u32 = 5;`.
1948 - [You can now use `#[repr(align(X)]` on enums.][61229]
1949 - [The `?` Kleene macro operator is now available in the
1950 2015 edition.][60932]
1954 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1955 and `-C profile-use` flags.][61268] For more information on how to use profile
1956 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1957 - [The `rust-lldb` wrapper script should now work again.][61827]
1961 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1965 - [`BufReader::buffer`]
1966 - [`BufWriter::buffer`]
1967 - [`Cell::from_mut`]
1968 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1969 - [`DoubleEndedIterator::nth_back`]
1971 - [`Wrapping::reverse_bits`]
1972 - [`i128::reverse_bits`]
1973 - [`i16::reverse_bits`]
1974 - [`i32::reverse_bits`]
1975 - [`i64::reverse_bits`]
1976 - [`i8::reverse_bits`]
1977 - [`isize::reverse_bits`]
1978 - [`slice::copy_within`]
1979 - [`u128::reverse_bits`]
1980 - [`u16::reverse_bits`]
1981 - [`u32::reverse_bits`]
1982 - [`u64::reverse_bits`]
1983 - [`u8::reverse_bits`]
1984 - [`usize::reverse_bits`]
1988 - [`Cargo.lock` files are now included by default when publishing executable crates
1989 with executables.][cargo/7026]
1990 - [You can now specify `default-run="foo"` in `[package]` to specify the
1991 default executable to use for `cargo run`.][cargo/7056]
1998 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1999 Please transition your code to using the `..=` syntax for inclusive
2001 - [Using a trait object without the `dyn` will now warn by default.][61203]
2002 Please transition your code to use `dyn Trait` for trait objects instead.
2004 [62228]: https://github.com/rust-lang/rust/pull/62228/
2005 [62235]: https://github.com/rust-lang/rust/pull/62235/
2006 [61802]: https://github.com/rust-lang/rust/pull/61802/
2007 [61827]: https://github.com/rust-lang/rust/pull/61827/
2008 [61547]: https://github.com/rust-lang/rust/pull/61547/
2009 [61682]: https://github.com/rust-lang/rust/pull/61682/
2010 [61268]: https://github.com/rust-lang/rust/pull/61268/
2011 [61342]: https://github.com/rust-lang/rust/pull/61342/
2012 [61347]: https://github.com/rust-lang/rust/pull/61347/
2013 [61100]: https://github.com/rust-lang/rust/pull/61100/
2014 [61203]: https://github.com/rust-lang/rust/pull/61203/
2015 [61229]: https://github.com/rust-lang/rust/pull/61229/
2016 [60932]: https://github.com/rust-lang/rust/pull/60932/
2017 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
2018 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
2019 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
2020 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
2021 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
2022 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
2023 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
2024 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
2025 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
2026 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
2027 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
2028 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
2029 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
2030 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
2031 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
2032 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
2033 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
2034 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
2035 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
2036 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
2037 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
2038 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
2039 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
2040 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
2043 Version 1.36.0 (2019-07-04)
2044 ==========================
2048 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
2049 - [The order of traits in trait objects no longer affects the semantics of that
2050 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
2051 `dyn fmt::Debug + Send`, where this was previously not the case.
2055 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
2056 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
2057 - [`mem::needs_drop` is now available as a const fn.][60364]
2058 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
2059 - [`String` now implements `BorrowMut<str>`.][60404]
2060 - [`io::Cursor` now implements `Default`.][60234]
2061 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
2062 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
2063 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
2064 environment has access to heap memory allocation.
2065 - [`String` now implements `From<&String>`.][59825]
2066 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
2067 return a tuple of each argument when there is multiple arguments.
2068 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
2073 - [`VecDeque::rotate_left`]
2074 - [`VecDeque::rotate_right`]
2075 - [`Iterator::copied`]
2077 - [`io::IoSliceMut`]
2078 - [`Read::read_vectored`]
2079 - [`Write::write_vectored`]
2080 - [`str::as_mut_ptr`]
2081 - [`mem::MaybeUninit`]
2082 - [`pointer::align_offset`]
2083 - [`future::Future`]
2085 - [`task::RawWaker`]
2086 - [`task::RawWakerVTable`]
2092 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
2093 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
2095 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2099 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2106 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
2107 longer recommended, and will be deprecated in 1.39.0.
2109 [60318]: https://github.com/rust-lang/rust/pull/60318/
2110 [60364]: https://github.com/rust-lang/rust/pull/60364/
2111 [60370]: https://github.com/rust-lang/rust/pull/60370/
2112 [60404]: https://github.com/rust-lang/rust/pull/60404/
2113 [60234]: https://github.com/rust-lang/rust/pull/60234/
2114 [60244]: https://github.com/rust-lang/rust/pull/60244/
2115 [58623]: https://github.com/rust-lang/rust/pull/58623/
2116 [59648]: https://github.com/rust-lang/rust/pull/59648/
2117 [59675]: https://github.com/rust-lang/rust/pull/59675/
2118 [59825]: https://github.com/rust-lang/rust/pull/59825/
2119 [59826]: https://github.com/rust-lang/rust/pull/59826/
2120 [59445]: https://github.com/rust-lang/rust/pull/59445/
2121 [59114]: https://github.com/rust-lang/rust/pull/59114/
2122 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
2123 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
2124 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
2125 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
2126 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
2127 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
2128 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
2129 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
2130 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
2131 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
2132 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
2133 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
2134 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
2135 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
2136 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
2137 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
2138 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
2139 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
2140 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
2141 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
2144 Version 1.35.0 (2019-05-23)
2145 ==========================
2149 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
2150 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
2151 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
2153 unsafe fn call_unsafe(func: unsafe fn()) {
2158 unsafe { call_unsafe(|| {}); }
2165 - [Added the `armv6-unknown-freebsd-gnueabihf` and
2166 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2167 - [Added the `wasm32-unknown-wasi` target.][59464]
2172 - [`Thread` will now show its ID in `Debug` output.][59460]
2173 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
2174 - [`alloc::System` now implements `Default`.][59451]
2175 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
2177 - [`char::{ToLowercase, ToUppercase}` now
2178 implement `ExactSizeIterator`.][58778]
2179 - [All `NonZero` numeric types now implement `FromStr`.][58717]
2180 - [Removed the `Read` trait bounds
2181 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
2182 - [You can now call the `dbg!` macro without any parameters to print the file
2183 and line where it is called.][57847]
2184 - [In place ASCII case conversions are now up to 4× faster.][59283]
2185 e.g. `str::make_ascii_lowercase`
2186 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
2193 - [`RefCell::replace_with`]
2194 - [`RefCell::map_split`]
2196 - [`Range::contains`]
2197 - [`RangeFrom::contains`]
2198 - [`RangeTo::contains`]
2199 - [`RangeInclusive::contains`]
2200 - [`RangeToInclusive::contains`]
2201 - [`Option::copied`]
2205 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
2206 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
2211 - [The Rust toolchain is now available natively for musl based distros.][58575]
2213 [59460]: https://github.com/rust-lang/rust/pull/59460/
2214 [59464]: https://github.com/rust-lang/rust/pull/59464/
2215 [59500]: https://github.com/rust-lang/rust/pull/59500/
2216 [59512]: https://github.com/rust-lang/rust/pull/59512/
2217 [59580]: https://github.com/rust-lang/rust/pull/59580/
2218 [59283]: https://github.com/rust-lang/rust/pull/59283/
2219 [59451]: https://github.com/rust-lang/rust/pull/59451/
2220 [59076]: https://github.com/rust-lang/rust/pull/59076/
2221 [58778]: https://github.com/rust-lang/rust/pull/58778/
2222 [58717]: https://github.com/rust-lang/rust/pull/58717/
2223 [58369]: https://github.com/rust-lang/rust/pull/58369/
2224 [58423]: https://github.com/rust-lang/rust/pull/58423/
2225 [58080]: https://github.com/rust-lang/rust/pull/58080/
2226 [57847]: https://github.com/rust-lang/rust/pull/57847/
2227 [58575]: https://github.com/rust-lang/rust/pull/58575
2228 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
2229 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
2230 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
2231 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
2232 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
2233 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
2234 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
2235 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
2236 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
2237 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
2238 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
2239 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
2241 Version 1.34.2 (2019-05-14)
2242 ===========================
2244 * [Destabilize the `Error::type_id` function due to a security
2245 vulnerability][60785] ([CVE-2019-12083])
2247 [60785]: https://github.com/rust-lang/rust/pull/60785
2248 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
2250 Version 1.34.1 (2019-04-25)
2251 ===========================
2253 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
2254 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
2255 * [Fix Clippy panic when checking some macros][clippy/3805]
2257 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
2258 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
2259 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
2261 Version 1.34.0 (2019-04-11)
2262 ==========================
2266 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2267 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2269 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
2270 `#[attr{}]` procedural macros.][57367]
2271 - [You can now write `extern crate self as foo;`][57407] to import your
2272 crate's root into the extern prelude.
2277 - [You can now target `riscv64imac-unknown-none-elf` and
2278 `riscv64gc-unknown-none-elf`.][58406]
2279 - [You can now enable linker plugin LTO optimisations with
2280 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
2281 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
2283 - [You can now target `powerpc64-unknown-freebsd`.][57809]
2288 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
2289 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
2290 the `Hash` trait to create an iterator.
2291 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
2292 methods.][58421] Most notably you no longer require the `Ord` trait to create
2294 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
2295 for all numeric types.][58044]
2296 - [Indexing a `str` is now generic over all types that
2297 implement `SliceIndex<str>`.][57604]
2298 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
2299 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
2300 produce a warning if their returning type is unused.
2301 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
2302 `overflowing_pow` are now available for all numeric types.][57873] These are
2303 equivalent to methods such as `wrapping_add` for the `pow` operation.
2311 * [`Error::type_id`]
2312 * [`atomic::AtomicI16`]
2313 * [`atomic::AtomicI32`]
2314 * [`atomic::AtomicI64`]
2315 * [`atomic::AtomicI8`]
2316 * [`atomic::AtomicU16`]
2317 * [`atomic::AtomicU32`]
2318 * [`atomic::AtomicU64`]
2319 * [`atomic::AtomicU8`]
2320 * [`convert::Infallible`]
2321 * [`convert::TryFrom`]
2322 * [`convert::TryInto`]
2324 * [`iter::successors`]
2325 * [`num::NonZeroI128`]
2326 * [`num::NonZeroI16`]
2327 * [`num::NonZeroI32`]
2328 * [`num::NonZeroI64`]
2329 * [`num::NonZeroI8`]
2330 * [`num::NonZeroIsize`]
2331 * [`slice::sort_by_cached_key`]
2332 * [`str::escape_debug`]
2333 * [`str::escape_default`]
2334 * [`str::escape_unicode`]
2335 * [`str::split_ascii_whitespace`]
2338 * [`Instant::checked_add`]
2339 * [`Instant::checked_sub`]
2340 * [`SystemTime::checked_add`]
2341 * [`SystemTime::checked_sub`]
2345 - [You can now use alternative registries to crates.io.][cargo/6654]
2349 - [You can now use the `?` operator in your documentation tests without manually
2350 adding `fn main() -> Result<(), _> {}`.][56470]
2354 - [`Command::before_exec` is being replaced by the unsafe method
2355 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
2356 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
2357 can now use `const` functions in `static` variables.
2359 [58370]: https://github.com/rust-lang/rust/pull/58370/
2360 [58406]: https://github.com/rust-lang/rust/pull/58406/
2361 [58421]: https://github.com/rust-lang/rust/pull/58421/
2362 [58166]: https://github.com/rust-lang/rust/pull/58166/
2363 [58044]: https://github.com/rust-lang/rust/pull/58044/
2364 [58057]: https://github.com/rust-lang/rust/pull/58057/
2365 [58059]: https://github.com/rust-lang/rust/pull/58059/
2366 [57809]: https://github.com/rust-lang/rust/pull/57809/
2367 [57873]: https://github.com/rust-lang/rust/pull/57873/
2368 [57604]: https://github.com/rust-lang/rust/pull/57604/
2369 [57367]: https://github.com/rust-lang/rust/pull/57367/
2370 [57407]: https://github.com/rust-lang/rust/pull/57407/
2371 [57425]: https://github.com/rust-lang/rust/pull/57425/
2372 [57106]: https://github.com/rust-lang/rust/pull/57106/
2373 [56470]: https://github.com/rust-lang/rust/pull/56470/
2374 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
2375 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
2376 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
2377 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
2378 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
2379 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
2380 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
2381 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
2382 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
2383 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
2384 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
2385 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
2386 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
2387 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
2388 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
2389 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
2390 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
2391 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
2392 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
2393 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
2394 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
2395 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
2396 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
2397 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
2398 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
2399 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
2400 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
2401 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
2402 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
2403 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
2404 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
2407 Version 1.33.0 (2019-02-28)
2408 ==========================
2412 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
2413 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
2414 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
2415 E.g. You can have match statement on a `u8` that covers `0..=255` and
2416 you would no longer be required to have a `_ => unreachable!()` case.
2417 - [You can now have multiple patterns in `if let` and `while let`
2418 expressions.][57532] You can do this with the same syntax as a `match`
2428 let state = Creature::Crab("Ferris");
2430 if let Creature::Crab(name) | Creature::Person(name) = state {
2431 println!("This creature's name is: {}", name);
2435 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2436 this feature will by default produce a warning as this behaviour can be
2437 unintuitive. E.g. `if let _ = 5 {}`
2438 - [You can now use `let` bindings, assignments, expression statements,
2439 and irrefutable pattern destructuring in const functions.][57175]
2440 - [You can now call unsafe const functions.][57067] E.g.
2442 const unsafe fn foo() -> i32 { 5 }
2443 const fn bar() -> i32 {
2447 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2448 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2449 - [You can now specify a specific alignment with the `#[repr(packed)]`
2450 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2451 with an alignment of 2 bytes and a size of 6 bytes.
2452 - [You can now import an item from a module as an `_`.][56303] This allows you to
2453 import a trait's impls, and not have the name in the namespace. E.g.
2455 use std::io::Read as _;
2457 // Allowed as there is only one `Read` in the module.
2460 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2464 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2465 command line argument.][56351]
2466 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2467 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2468 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2469 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2470 information on Rust's platform support.
2471 - [Added support for the `thumbv7neon-linux-androideabi` and
2472 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2473 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2477 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2478 functions for all numeric types.][57566]
2479 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2480 are now `const` functions for all numeric types.][57105]
2481 - [The methods `is_positive` and `is_negative` are now `const` functions for
2482 all signed numeric types.][57105]
2483 - [The `get` method for all `NonZero` types is now `const`.][57167]
2484 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2485 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2486 numeric types.][57234]
2487 - [`Ipv4Addr::new` is now a `const` function][57234]
2491 - [`unix::FileExt::read_exact_at`]
2492 - [`unix::FileExt::write_all_at`]
2493 - [`Option::transpose`]
2494 - [`Result::transpose`]
2495 - [`convert::identity`]
2498 - [`marker::PhantomPinned`]
2499 - [`Vec::resize_with`]
2500 - [`VecDeque::resize_with`]
2501 - [`Duration::as_millis`]
2502 - [`Duration::as_micros`]
2503 - [`Duration::as_nanos`]
2508 - [You can now publish crates that require a feature flag to compile with
2509 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2510 - [Cargo should now rebuild a crate if a file was modified during the initial
2515 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2516 are now deprecated in the standard library, and their usage will now produce a warning.
2517 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2519 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2521 - [Libtest no longer creates a new thread for each test when
2522 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2524 [55982]: https://github.com/rust-lang/rust/pull/55982/
2525 [56243]: https://github.com/rust-lang/rust/pull/56243
2526 [56303]: https://github.com/rust-lang/rust/pull/56303/
2527 [56351]: https://github.com/rust-lang/rust/pull/56351/
2528 [56362]: https://github.com/rust-lang/rust/pull/56362
2529 [56642]: https://github.com/rust-lang/rust/pull/56642/
2530 [56769]: https://github.com/rust-lang/rust/pull/56769/
2531 [56805]: https://github.com/rust-lang/rust/pull/56805
2532 [56947]: https://github.com/rust-lang/rust/pull/56947/
2533 [57049]: https://github.com/rust-lang/rust/pull/57049/
2534 [57067]: https://github.com/rust-lang/rust/pull/57067/
2535 [57105]: https://github.com/rust-lang/rust/pull/57105
2536 [57130]: https://github.com/rust-lang/rust/pull/57130/
2537 [57167]: https://github.com/rust-lang/rust/pull/57167/
2538 [57175]: https://github.com/rust-lang/rust/pull/57175/
2539 [57234]: https://github.com/rust-lang/rust/pull/57234/
2540 [57332]: https://github.com/rust-lang/rust/pull/57332/
2541 [57465]: https://github.com/rust-lang/rust/pull/57465/
2542 [57532]: https://github.com/rust-lang/rust/pull/57532/
2543 [57535]: https://github.com/rust-lang/rust/pull/57535/
2544 [57566]: https://github.com/rust-lang/rust/pull/57566/
2545 [57615]: https://github.com/rust-lang/rust/pull/57615/
2546 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2547 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2548 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2549 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2550 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2551 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2552 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2553 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2554 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2555 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2556 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2557 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2558 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2559 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2560 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2561 [platform-support]: https://forge.rust-lang.org/platform-support.html
2563 Version 1.32.0 (2019-01-17)
2564 ==========================
2569 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2570 operator allows you to specify zero or one repetitions similar to the `*` and
2572 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2573 now always resolve to the item (`enum`, `struct`, etc.) available in the
2574 module if present, before resolving to a external crate or an item the prelude.][56759]
2577 enum Color { Red, Green, Blue }
2583 - [You can now match against `PhantomData<T>` types.][55837]
2584 - [You can now match against literals in macros with the `literal`
2585 specifier.][56072] This will match against a literal of any type.
2586 E.g. `1`, `'A'`, `"Hello World"`
2587 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2589 struct Point(i32, i32);
2592 pub fn new(x: i32, y: i32) -> Self {
2596 pub fn is_origin(&self) -> bool {
2604 - [Self can also now be used in type definitions.][56366] E.g.
2608 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2611 Cons(T, Box<Self>) // likewise here
2614 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2615 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2619 - [The default allocator has changed from jemalloc to the default allocator on
2620 your system.][55238] The compiler itself on Linux & macOS will still use
2621 jemalloc, but programs compiled with it will use the system allocator.
2622 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2626 - [`PathBuf` now implements `FromStr`.][55148]
2627 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2628 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2629 easily debug expressions in your rust program. E.g.
2632 let b = dbg!(a * 2) + 1;
2633 // ^-- prints: [src/main.rs:4] a * 2 = 4
2637 The following APIs are now `const` functions and can be used in a
2641 - [`UnsafeCell::get`]
2642 - [`char::is_ascii`]
2644 - [`ManuallyDrop::new`]
2645 - [`ManuallyDrop::into_inner`]
2646 - [`RangeInclusive::start`]
2647 - [`RangeInclusive::end`]
2648 - [`NonNull::as_ptr`]
2651 - [`Duration::as_secs`]
2652 - [`Duration::subsec_millis`]
2653 - [`Duration::subsec_micros`]
2654 - [`Duration::subsec_nanos`]
2656 - [`Ipv4Addr::is_unspecified`]
2658 - [`Ipv6Addr::octets`]
2662 - [`i8::to_be_bytes`]
2663 - [`i8::to_le_bytes`]
2664 - [`i8::to_ne_bytes`]
2665 - [`i8::from_be_bytes`]
2666 - [`i8::from_le_bytes`]
2667 - [`i8::from_ne_bytes`]
2668 - [`i16::to_be_bytes`]
2669 - [`i16::to_le_bytes`]
2670 - [`i16::to_ne_bytes`]
2671 - [`i16::from_be_bytes`]
2672 - [`i16::from_le_bytes`]
2673 - [`i16::from_ne_bytes`]
2674 - [`i32::to_be_bytes`]
2675 - [`i32::to_le_bytes`]
2676 - [`i32::to_ne_bytes`]
2677 - [`i32::from_be_bytes`]
2678 - [`i32::from_le_bytes`]
2679 - [`i32::from_ne_bytes`]
2680 - [`i64::to_be_bytes`]
2681 - [`i64::to_le_bytes`]
2682 - [`i64::to_ne_bytes`]
2683 - [`i64::from_be_bytes`]
2684 - [`i64::from_le_bytes`]
2685 - [`i64::from_ne_bytes`]
2686 - [`i128::to_be_bytes`]
2687 - [`i128::to_le_bytes`]
2688 - [`i128::to_ne_bytes`]
2689 - [`i128::from_be_bytes`]
2690 - [`i128::from_le_bytes`]
2691 - [`i128::from_ne_bytes`]
2692 - [`isize::to_be_bytes`]
2693 - [`isize::to_le_bytes`]
2694 - [`isize::to_ne_bytes`]
2695 - [`isize::from_be_bytes`]
2696 - [`isize::from_le_bytes`]
2697 - [`isize::from_ne_bytes`]
2698 - [`u8::to_be_bytes`]
2699 - [`u8::to_le_bytes`]
2700 - [`u8::to_ne_bytes`]
2701 - [`u8::from_be_bytes`]
2702 - [`u8::from_le_bytes`]
2703 - [`u8::from_ne_bytes`]
2704 - [`u16::to_be_bytes`]
2705 - [`u16::to_le_bytes`]
2706 - [`u16::to_ne_bytes`]
2707 - [`u16::from_be_bytes`]
2708 - [`u16::from_le_bytes`]
2709 - [`u16::from_ne_bytes`]
2710 - [`u32::to_be_bytes`]
2711 - [`u32::to_le_bytes`]
2712 - [`u32::to_ne_bytes`]
2713 - [`u32::from_be_bytes`]
2714 - [`u32::from_le_bytes`]
2715 - [`u32::from_ne_bytes`]
2716 - [`u64::to_be_bytes`]
2717 - [`u64::to_le_bytes`]
2718 - [`u64::to_ne_bytes`]
2719 - [`u64::from_be_bytes`]
2720 - [`u64::from_le_bytes`]
2721 - [`u64::from_ne_bytes`]
2722 - [`u128::to_be_bytes`]
2723 - [`u128::to_le_bytes`]
2724 - [`u128::to_ne_bytes`]
2725 - [`u128::from_be_bytes`]
2726 - [`u128::from_le_bytes`]
2727 - [`u128::from_ne_bytes`]
2728 - [`usize::to_be_bytes`]
2729 - [`usize::to_le_bytes`]
2730 - [`usize::to_ne_bytes`]
2731 - [`usize::from_be_bytes`]
2732 - [`usize::from_le_bytes`]
2733 - [`usize::from_ne_bytes`]
2737 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2738 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2742 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2746 - [The argument types for AVX's
2747 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2748 been changed from `*const` to `*mut` as the previous implementation
2752 [55148]: https://github.com/rust-lang/rust/pull/55148/
2753 [55238]: https://github.com/rust-lang/rust/pull/55238/
2754 [55280]: https://github.com/rust-lang/rust/pull/55280/
2755 [55610]: https://github.com/rust-lang/rust/pull/55610/
2756 [55663]: https://github.com/rust-lang/rust/pull/55663/
2757 [55702]: https://github.com/rust-lang/rust/pull/55702/
2758 [55837]: https://github.com/rust-lang/rust/pull/55837/
2759 [55843]: https://github.com/rust-lang/rust/pull/55843/
2760 [56072]: https://github.com/rust-lang/rust/pull/56072/
2761 [56245]: https://github.com/rust-lang/rust/pull/56245/
2762 [56365]: https://github.com/rust-lang/rust/pull/56365/
2763 [56366]: https://github.com/rust-lang/rust/pull/56366/
2764 [56395]: https://github.com/rust-lang/rust/pull/56395/
2765 [56759]: https://github.com/rust-lang/rust/pull/56759/
2766 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2767 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2768 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2769 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2770 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2771 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2772 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2773 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2774 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2775 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2776 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2777 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2778 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2779 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2780 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2781 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2782 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2783 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2784 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2785 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2786 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2787 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2788 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2789 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2790 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2791 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2792 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2793 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2794 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2795 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2796 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2797 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2798 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2799 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2800 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2801 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2802 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2803 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2804 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2805 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2806 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2807 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2808 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2809 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2810 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2811 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2812 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2813 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2814 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2815 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2816 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2817 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2818 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2819 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2820 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2821 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2822 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2823 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2824 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2825 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2826 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2827 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2828 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2829 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2830 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2831 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2832 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2833 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2834 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2835 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2836 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2837 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2838 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2839 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2840 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2841 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2842 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2843 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2844 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2845 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2846 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2847 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2848 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2849 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2850 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2851 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2852 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2853 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2854 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2855 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2856 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2857 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2858 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2861 Version 1.31.1 (2018-12-20)
2862 ===========================
2864 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2865 - [Fix broken go-to-definition in RLS][rls/1171]
2866 - [Fix infinite loop on hover in RLS][rls/1170]
2868 [56562]: https://github.com/rust-lang/rust/pull/56562
2869 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2870 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2872 Version 1.31.0 (2018-12-06)
2873 ==========================
2877 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2878 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2879 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2880 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2882 - [You can now define and use `const` functions.][54835] These are currently
2883 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2884 [language reference][const-reference] for what exactly is available.
2885 - [You can now use tool lints, which allow you to scope lints from external
2886 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2887 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2888 a crate, not just in exported functions.][54451]
2889 - [You can now use parentheses in pattern matches.][54497]
2893 - [Updated musl to 1.1.20][54430]
2897 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2898 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2899 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2900 into `Option<&mut T>` using the `From` trait.][53218]
2901 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2906 - [`slice::align_to`]
2907 - [`slice::align_to_mut`]
2908 - [`slice::chunks_exact`]
2909 - [`slice::chunks_exact_mut`]
2910 - [`slice::rchunks`]
2911 - [`slice::rchunks_mut`]
2912 - [`slice::rchunks_exact`]
2913 - [`slice::rchunks_exact_mut`]
2914 - [`Option::replace`]
2918 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2919 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2920 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2922 [52813]: https://github.com/rust-lang/rust/pull/52813/
2923 [53218]: https://github.com/rust-lang/rust/pull/53218/
2924 [53555]: https://github.com/rust-lang/rust/issues/53555/
2925 [54057]: https://github.com/rust-lang/rust/pull/54057/
2926 [54240]: https://github.com/rust-lang/rust/pull/54240/
2927 [54430]: https://github.com/rust-lang/rust/pull/54430/
2928 [54451]: https://github.com/rust-lang/rust/pull/54451/
2929 [54497]: https://github.com/rust-lang/rust/pull/54497/
2930 [54778]: https://github.com/rust-lang/rust/pull/54778/
2931 [54835]: https://github.com/rust-lang/rust/pull/54835/
2932 [54870]: https://github.com/rust-lang/rust/pull/54870/
2933 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2934 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2935 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2936 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2937 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2938 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2939 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2940 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2941 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2942 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2943 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2944 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2945 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2946 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2948 Version 1.30.1 (2018-11-08)
2949 ===========================
2951 - [Fixed overflow ICE in rustdoc][54199]
2952 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2954 [54199]: https://github.com/rust-lang/rust/pull/54199
2955 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2957 Version 1.30.0 (2018-10-25)
2958 ==========================
2962 - [Procedural macros are now available.][52081] These kinds of macros allow for
2963 more powerful code generation. There is a [new chapter available][proc-macros]
2964 in the Rust Programming Language book that goes further in depth.
2965 - [You can now use keywords as identifiers using the raw identifiers
2966 syntax (`r#`),][53236] e.g. `let r#for = true;`
2967 - [Using anonymous parameters in traits is now deprecated with a warning and
2968 will be a hard error in the 2018 edition.][53272]
2969 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2970 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2971 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2972 Previously, using a external crate in a module without a use statement
2973 required `let json = ::serde_json::from_str(foo);` but can now be written
2974 as `let json = serde_json::from_str(foo);`.
2975 - [You can now apply the `#[used]` attribute to static items to prevent the
2976 compiler from optimising them away, even if they appear to be unused,][51363]
2977 e.g. `#[used] static FOO: u32 = 1;`
2978 - [You can now import and reexport macros from other crates with the `use`
2979 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2980 the root module of the crate. If your macro relies on calling other local
2981 macros, it is recommended to export with the
2982 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2984 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2985 using the `vis` specifier.][53370]
2986 - [Non-macro attributes now allow all forms of literals, not just
2987 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2988 write `#[attr(true)]`.
2989 - [You can now specify a function to handle a panic in the Rust runtime with the
2990 `#[panic_handler]` attribute.][51366]
2994 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2995 - [Added the `aarch64-unknown-netbsd` target][53165]
2996 - [Upgraded to LLVM 8.][53611]
3000 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3004 - [`Ipv4Addr::BROADCAST`]
3005 - [`Ipv4Addr::LOCALHOST`]
3006 - [`Ipv4Addr::UNSPECIFIED`]
3007 - [`Ipv6Addr::LOCALHOST`]
3008 - [`Ipv6Addr::UNSPECIFIED`]
3009 - [`Iterator::find_map`]
3011 The following methods are replacement methods for `trim_left`, `trim_right`,
3012 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3014 - [`str::trim_end_matches`]
3016 - [`str::trim_start_matches`]
3017 - [`str::trim_start`]
3021 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
3022 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
3023 equivalent to calling `rustdoc --error-format=json`.
3024 - [Cargo will now provide a progress bar for builds.][cargo/5995]
3028 - [`rustdoc` allows you to specify what edition to treat your code as with the
3029 `--edition` option.][54057]
3030 - [`rustdoc` now has the `--color` (specify whether to output color) and
3031 `--error-format` (specify error format, e.g. `json`) options.][53003]
3032 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
3033 debug symbols.][53774]
3034 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
3035 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
3037 [50911]: https://github.com/rust-lang/rust/pull/50911/
3038 [51363]: https://github.com/rust-lang/rust/pull/51363/
3039 [51366]: https://github.com/rust-lang/rust/pull/51366/
3040 [52081]: https://github.com/rust-lang/rust/pull/52081/
3041 [53003]: https://github.com/rust-lang/rust/pull/53003/
3042 [53033]: https://github.com/rust-lang/rust/pull/53033/
3043 [53044]: https://github.com/rust-lang/rust/pull/53044/
3044 [53165]: https://github.com/rust-lang/rust/pull/53165/
3045 [53611]: https://github.com/rust-lang/rust/pull/53611/
3046 [53213]: https://github.com/rust-lang/rust/pull/53213/
3047 [53236]: https://github.com/rust-lang/rust/pull/53236/
3048 [53272]: https://github.com/rust-lang/rust/pull/53272/
3049 [53370]: https://github.com/rust-lang/rust/pull/53370/
3050 [53459]: https://github.com/rust-lang/rust/pull/53459/
3051 [53774]: https://github.com/rust-lang/rust/pull/53774/
3052 [53822]: https://github.com/rust-lang/rust/pull/53822/
3053 [54057]: https://github.com/rust-lang/rust/pull/54057/
3054 [54146]: https://github.com/rust-lang/rust/pull/54146/
3055 [54404]: https://github.com/rust-lang/rust/pull/54404/
3056 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
3057 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
3058 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
3059 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
3061 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
3062 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
3063 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
3064 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
3065 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
3066 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
3067 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
3068 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
3069 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
3070 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
3073 Version 1.29.2 (2018-10-11)
3074 ===========================
3076 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
3077 - The `rls-preview` component on the windows-gnu targets has been restored.
3079 [54639]: https://github.com/rust-lang/rust/pull/54639
3082 Version 1.29.1 (2018-09-25)
3083 ===========================
3088 - The standard library's `str::repeat` function contained an out of bounds write
3089 caused by an integer overflow. This has been fixed by deterministically
3090 panicking when an overflow happens.
3092 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
3096 Version 1.29.0 (2018-09-13)
3097 ==========================
3101 - [Bumped minimum LLVM version to 5.0.][51899]
3102 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
3103 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
3104 - [Upgraded to LLVM 7.][51966]
3108 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
3109 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
3110 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
3111 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
3113 - [`Cell<T>` now allows `T` to be unsized.][50494]
3114 - [`SocketAddr` is now stable on Redox.][52656]
3119 - [`Iterator::flatten`]
3124 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3125 `--locked` to disable this behavior.
3126 - [`cargo-install` will now allow you to cross compile an install
3127 using `--target`.][cargo/5614]
3128 - [Added the `cargo-fix` subcommand to automatically move project code from
3129 2015 edition to 2018.][cargo/5723]
3130 - [`cargo doc` can now optionally document private types using the
3131 `--document-private-items` flag.][cargo/5543]
3135 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
3136 the specified level to that level.][52354] For example `--cap-lints warn`
3137 will demote `deny` and `forbid` lints to `warn`.
3138 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
3139 fails and `101` if there is a panic.][52197]
3140 - [A preview of clippy has been made available through rustup.][51122]
3141 You can install the preview with `rustup component add clippy-preview`.
3145 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3146 Use `str::get_unchecked(begin..end)` instead.
3147 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
3148 Consider using the `home_dir` function from
3149 https://crates.io/crates/dirs instead.
3150 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
3151 - [`cfg` attributes and `--cfg` command line flags are now more
3152 strictly validated.][53893]
3154 [53893]: https://github.com/rust-lang/rust/pull/53893/
3155 [52861]: https://github.com/rust-lang/rust/pull/52861/
3156 [51966]: https://github.com/rust-lang/rust/pull/51966/
3157 [52656]: https://github.com/rust-lang/rust/pull/52656/
3158 [52239]: https://github.com/rust-lang/rust/pull/52239/
3159 [52330]: https://github.com/rust-lang/rust/pull/52330/
3160 [52354]: https://github.com/rust-lang/rust/pull/52354/
3161 [52402]: https://github.com/rust-lang/rust/pull/52402/
3162 [52103]: https://github.com/rust-lang/rust/pull/52103/
3163 [52197]: https://github.com/rust-lang/rust/pull/52197/
3164 [51807]: https://github.com/rust-lang/rust/pull/51807/
3165 [51899]: https://github.com/rust-lang/rust/pull/51899/
3166 [51912]: https://github.com/rust-lang/rust/pull/51912/
3167 [51511]: https://github.com/rust-lang/rust/pull/51511/
3168 [51619]: https://github.com/rust-lang/rust/pull/51619/
3169 [51656]: https://github.com/rust-lang/rust/pull/51656/
3170 [51178]: https://github.com/rust-lang/rust/pull/51178/
3171 [51122]: https://github.com/rust-lang/rust/pull/51122
3172 [50494]: https://github.com/rust-lang/rust/pull/50494/
3173 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
3174 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
3175 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
3176 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
3177 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
3178 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
3179 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
3182 Version 1.28.0 (2018-08-02)
3183 ===========================
3187 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
3188 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
3189 the inner type across Foreign Function Interface (FFI) boundaries.
3190 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
3191 and can now be used as identifiers.][51196]
3192 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
3193 stable.][51241] This will allow users to specify a global allocator for
3195 - [Unit test functions marked with the `#[test]` attribute can now return
3196 `Result<(), E: Debug>` in addition to `()`.][51298]
3197 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
3198 allows macros to easily target lifetimes.
3202 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
3203 prioritise making smaller binary sizes. `z` is the same as `s` with the
3204 exception that it does not vectorise loops, which typically results in an even
3206 - [The short error format is now stable.][49546] Specified with
3207 `--error-format=short` this option will provide a more compressed output of
3208 rust error messages.
3209 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
3210 - [Reduced the number of allocations in the macro parser.][50855] This can
3211 improve compile times of macro heavy crates on average by 5%.
3215 - [Implemented `Default` for `&mut str`.][51306]
3216 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
3217 - [Implemented `Extend` for `()`.][50234]
3218 - [The `Debug` implementation of `time::Duration` should now be more easily
3219 human readable.][50364] Previously a `Duration` of one second would printed as
3220 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
3221 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
3222 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
3223 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
3224 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
3225 for `PathBuf`.][50170]
3226 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
3227 and `Wrapping<i128>`.][50465]
3228 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
3229 possible.][51050] This can provide up to a 40% speed increase.
3230 - [Improved error messages when using `format!`.][50610]
3234 - [`Iterator::step_by`]
3235 - [`Path::ancestors`]
3236 - [`SystemTime::UNIX_EPOCH`]
3237 - [`alloc::GlobalAlloc`]
3239 - [`alloc::LayoutErr`]
3242 - [`alloc::alloc_zeroed`]
3243 - [`alloc::dealloc`]
3244 - [`alloc::realloc`]
3245 - [`alloc::handle_alloc_error`]
3246 - [`btree_map::Entry::or_default`]
3247 - [`fmt::Alignment`]
3248 - [`hash_map::Entry::or_default`]
3249 - [`iter::repeat_with`]
3250 - [`num::NonZeroUsize`]
3251 - [`num::NonZeroU128`]
3252 - [`num::NonZeroU16`]
3253 - [`num::NonZeroU32`]
3254 - [`num::NonZeroU64`]
3255 - [`num::NonZeroU8`]
3256 - [`ops::RangeBounds`]
3257 - [`slice::SliceIndex`]
3258 - [`slice::from_mut`]
3259 - [`slice::from_ref`]
3260 - [`{Any + Send + Sync}::downcast_mut`]
3261 - [`{Any + Send + Sync}::downcast_ref`]
3262 - [`{Any + Send + Sync}::is`]
3266 - [Cargo will now no longer allow you to publish crates with build scripts that
3267 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
3268 considered to be immutable.
3272 - [The `suggestion_applicability` field in `rustc`'s json output is now
3273 stable.][50486] This will allow dev tools to check whether a code suggestion
3274 would apply to them.
3278 - [Rust will consider trait objects with duplicated constraints to be the same
3279 type as without the duplicated constraint.][51276] For example the below code will
3280 now fail to compile.
3285 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3288 impl Trait + Send + Send {
3289 fn test(&self) { println!("two"); }
3293 [49546]: https://github.com/rust-lang/rust/pull/49546/
3294 [50143]: https://github.com/rust-lang/rust/pull/50143/
3295 [50170]: https://github.com/rust-lang/rust/pull/50170/
3296 [50234]: https://github.com/rust-lang/rust/pull/50234/
3297 [50265]: https://github.com/rust-lang/rust/pull/50265/
3298 [50364]: https://github.com/rust-lang/rust/pull/50364/
3299 [50385]: https://github.com/rust-lang/rust/pull/50385/
3300 [50465]: https://github.com/rust-lang/rust/pull/50465/
3301 [50486]: https://github.com/rust-lang/rust/pull/50486/
3302 [50554]: https://github.com/rust-lang/rust/pull/50554/
3303 [50610]: https://github.com/rust-lang/rust/pull/50610/
3304 [50855]: https://github.com/rust-lang/rust/pull/50855/
3305 [51050]: https://github.com/rust-lang/rust/pull/51050/
3306 [51196]: https://github.com/rust-lang/rust/pull/51196/
3307 [51200]: https://github.com/rust-lang/rust/pull/51200/
3308 [51241]: https://github.com/rust-lang/rust/pull/51241/
3309 [51276]: https://github.com/rust-lang/rust/pull/51276/
3310 [51298]: https://github.com/rust-lang/rust/pull/51298/
3311 [51306]: https://github.com/rust-lang/rust/pull/51306/
3312 [51562]: https://github.com/rust-lang/rust/pull/51562/
3313 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
3314 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
3315 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
3316 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
3317 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
3318 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
3319 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
3320 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
3321 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
3322 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
3323 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
3324 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
3325 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
3326 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
3327 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
3328 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
3329 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
3330 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
3331 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
3332 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
3333 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
3334 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
3335 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
3336 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
3337 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
3338 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
3339 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
3340 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
3341 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
3342 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
3344 Version 1.27.2 (2018-07-20)
3345 ===========================
3350 - The borrow checker was fixed to avoid potential unsoundness when using
3351 match ergonomics: [#52213][52213].
3353 [52213]: https://github.com/rust-lang/rust/issues/52213
3355 Version 1.27.1 (2018-07-10)
3356 ===========================
3361 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
3362 when running, which enabled executing code as some other user on a
3363 given machine. This release fixes that vulnerability; you can read
3364 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
3366 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
3371 - The borrow checker was fixed to avoid an additional potential unsoundness when using
3372 match ergonomics: [#51415][51415], [#49534][49534].
3374 [51415]: https://github.com/rust-lang/rust/issues/51415
3375 [49534]: https://github.com/rust-lang/rust/issues/49534
3376 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
3377 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
3379 Version 1.27.0 (2018-06-21)
3380 ==========================
3384 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
3385 be used as an identifier.
3386 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
3387 bare `Trait` syntax, and should make it clearer when being used in tandem with
3388 `impl Trait` because it is equivalent to the following syntax:
3389 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
3390 `Box<Trait> == Box<dyn Trait>`.
3391 - [Attributes on generic parameters such as types and lifetimes are
3392 now stable.][48851] e.g.
3393 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
3394 - [The `#[must_use]` attribute can now also be used on functions as well as
3395 types.][48925] It provides a lint that by default warns users when the
3396 value returned by a function has not been used.
3400 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
3404 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
3405 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
3406 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
3407 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
3408 the `cfg` attribute.
3409 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
3410 std are now available in core.][49896]
3411 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
3413 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
3414 that the operation isn't done in place.
3415 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
3416 the `#[must_use]` attribute][49533] to warn about unused potentially
3417 expensive allocations.
3421 - [`DoubleEndedIterator::rfind`]
3422 - [`DoubleEndedIterator::rfold`]
3423 - [`DoubleEndedIterator::try_rfold`]
3424 - [`Duration::from_micros`]
3425 - [`Duration::from_nanos`]
3426 - [`Duration::subsec_micros`]
3427 - [`Duration::subsec_millis`]
3428 - [`HashMap::remove_entry`]
3429 - [`Iterator::try_fold`]
3430 - [`Iterator::try_for_each`]
3432 - [`Option::filter`]
3433 - [`String::replace_range`]
3434 - [`Take::set_limit`]
3435 - [`hint::unreachable_unchecked`]
3436 - [`os::unix::process::parent_id`]
3437 - [`ptr::swap_nonoverlapping`]
3438 - [`slice::rsplit_mut`]
3440 - [`slice::swap_with_slice`]
3444 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3445 `readme`, and `repository` fields.][cargo/5386]
3446 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3447 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3448 a different directory than `target` for placing compilation artifacts.
3449 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3450 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3451 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3452 where cargo would infer a binary, Cargo will produce a warning. You can
3453 disable this feature ahead of time by setting any of the following to false:
3454 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3455 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3456 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3460 - [Added “The Rustc book” into the official documentation.][49707]
3461 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3462 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3466 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3467 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3468 compile, `"".is_empty()` will still compile.
3469 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3470 will only print the inner type.][48553] E.g.
3471 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3472 not `AtomicBool(true)`.
3473 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3474 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3475 alignment should cover all use cases.
3476 - The `.description()` method on the `std::error::Error` trait
3477 [has been soft-deprecated][50163]. It is no longer required to implement it.
3479 [48553]: https://github.com/rust-lang/rust/pull/48553/
3480 [48851]: https://github.com/rust-lang/rust/pull/48851/
3481 [48925]: https://github.com/rust-lang/rust/pull/48925/
3482 [49533]: https://github.com/rust-lang/rust/pull/49533/
3483 [49623]: https://github.com/rust-lang/rust/pull/49623/
3484 [49630]: https://github.com/rust-lang/rust/pull/49630/
3485 [49664]: https://github.com/rust-lang/rust/pull/49664/
3486 [49699]: https://github.com/rust-lang/rust/pull/49699/
3487 [49707]: https://github.com/rust-lang/rust/pull/49707/
3488 [49719]: https://github.com/rust-lang/rust/pull/49719/
3489 [49896]: https://github.com/rust-lang/rust/pull/49896/
3490 [49968]: https://github.com/rust-lang/rust/pull/49968/
3491 [50163]: https://github.com/rust-lang/rust/pull/50163
3492 [50177]: https://github.com/rust-lang/rust/pull/50177/
3493 [50378]: https://github.com/rust-lang/rust/pull/50378/
3494 [50398]: https://github.com/rust-lang/rust/pull/50398/
3495 [50423]: https://github.com/rust-lang/rust/pull/50423/
3496 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3497 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3498 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3499 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3500 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3501 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3502 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3503 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3504 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3505 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3506 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3507 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3508 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3509 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3510 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3511 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3512 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3513 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3514 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3515 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3516 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3517 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3518 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3519 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3520 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3521 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3522 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3523 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3524 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3525 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3528 Version 1.26.2 (2018-06-05)
3529 ==========================
3534 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3536 [51117]: https://github.com/rust-lang/rust/issues/51117
3539 Version 1.26.1 (2018-05-29)
3540 ==========================
3545 - [RLS now works on Windows.][50646]
3546 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3552 - [`fn main() -> impl Trait` no longer works for non-Termination
3554 This reverts an accidental stabilization.
3555 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3556 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3558 [50646]: https://github.com/rust-lang/rust/issues/50646
3559 [50656]: https://github.com/rust-lang/rust/pull/50656
3560 [50812]: https://github.com/rust-lang/rust/pull/50812
3561 [50950]: https://github.com/rust-lang/rust/issues/50950
3562 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3564 Version 1.26.0 (2018-05-10)
3565 ==========================
3569 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3570 implement either or both traits.][49299]
3571 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3572 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3573 lifetime can be elided.][49458]
3574 - [`impl Trait` is now stable allowing you to have abstract types in returns
3575 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3576 `fn open(path: impl AsRef<Path>)`.
3577 - [Pattern matching will now automatically apply dereferences.][49394]
3578 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3579 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3580 - [A lot of operations are now available in a const context.][46882] E.g. You
3581 can now index into constant arrays, reference and dereference into constants,
3582 and use tuple struct constructors.
3583 - [Fixed entry slice patterns are now stable.][48516] E.g.
3585 let points = [1, 2, 3, 4];
3587 [1, 2, 3, 4] => println!("All points were sequential."),
3588 _ => println!("Not all points were sequential."),
3595 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3596 - [Fixed exponential projection complexity on nested types.][48296]
3597 This can provide up to a ~12% reduction in compile times for certain crates.
3598 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3599 to remap path prefixes outputted by the compiler.
3600 - [Added `powerpc-unknown-netbsd` target.][48281]
3604 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3605 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3606 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3607 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3608 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3609 - [`ascii::escape_default` is now available in libcore.][48735]
3610 - [Trailing commas are now supported in std and core macros.][48056]
3611 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3612 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3617 - [`*const T::copy_to_nonoverlapping`]
3618 - [`*const T::copy_to`]
3619 - [`*const T::read_unaligned`]
3620 - [`*const T::read_volatile`]
3621 - [`*const T::read`]
3623 - [`*const T::wrapping_add`]
3624 - [`*const T::wrapping_sub`]
3626 - [`*mut T::copy_to_nonoverlapping`]
3627 - [`*mut T::copy_to`]
3628 - [`*mut T::read_unaligned`]
3629 - [`*mut T::read_volatile`]
3631 - [`*mut T::replace`]
3634 - [`*mut T::wrapping_add`]
3635 - [`*mut T::wrapping_sub`]
3636 - [`*mut T::write_bytes`]
3637 - [`*mut T::write_unaligned`]
3638 - [`*mut T::write_volatile`]
3641 - [`FromUtf8Error::as_bytes`]
3642 - [`LocalKey::try_with`]
3643 - [`Option::cloned`]
3644 - [`btree_map::Entry::and_modify`]
3645 - [`fs::read_to_string`]
3648 - [`hash_map::Entry::and_modify`]
3649 - [`iter::FusedIterator`]
3650 - [`ops::RangeInclusive`]
3651 - [`ops::RangeToInclusive`]
3653 - [`slice::rotate_left`]
3654 - [`slice::rotate_right`]
3655 - [`String::retain`]
3660 - [Cargo will now output path to custom commands when `-v` is
3661 passed with `--list`][cargo/5041]
3662 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3666 - [The second edition of "The Rust Programming Language" book is now recommended
3667 over the first.][48404]
3672 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3673 syntax is now invalid.
3675 use std::ops::Fn as dyn;
3676 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3678 - [The result of dereferences are no longer promoted to `'static`.][47408]
3682 const PAIR: &(i32, i32) = &(0, 1);
3683 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3686 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3687 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3689 - [Removed hoedown from rustdoc.][48274]
3690 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3692 [46882]: https://github.com/rust-lang/rust/pull/46882
3693 [47379]: https://github.com/rust-lang/rust/pull/47379
3694 [47408]: https://github.com/rust-lang/rust/pull/47408
3695 [47813]: https://github.com/rust-lang/rust/pull/47813
3696 [48056]: https://github.com/rust-lang/rust/pull/48056
3697 [48125]: https://github.com/rust-lang/rust/pull/48125
3698 [48166]: https://github.com/rust-lang/rust/pull/48166
3699 [48235]: https://github.com/rust-lang/rust/pull/48235
3700 [48274]: https://github.com/rust-lang/rust/pull/48274
3701 [48281]: https://github.com/rust-lang/rust/pull/48281
3702 [48296]: https://github.com/rust-lang/rust/pull/48296
3703 [48326]: https://github.com/rust-lang/rust/pull/48326
3704 [48359]: https://github.com/rust-lang/rust/pull/48359
3705 [48404]: https://github.com/rust-lang/rust/pull/48404
3706 [48481]: https://github.com/rust-lang/rust/pull/48481
3707 [48516]: https://github.com/rust-lang/rust/pull/48516
3708 [48628]: https://github.com/rust-lang/rust/pull/48628
3709 [48629]: https://github.com/rust-lang/rust/pull/48629
3710 [48657]: https://github.com/rust-lang/rust/pull/48657
3711 [48735]: https://github.com/rust-lang/rust/pull/48735
3712 [48978]: https://github.com/rust-lang/rust/pull/48978
3713 [49101]: https://github.com/rust-lang/rust/pull/49101
3714 [49109]: https://github.com/rust-lang/rust/pull/49109
3715 [49121]: https://github.com/rust-lang/rust/pull/49121
3716 [49162]: https://github.com/rust-lang/rust/pull/49162
3717 [49184]: https://github.com/rust-lang/rust/pull/49184
3718 [49234]: https://github.com/rust-lang/rust/pull/49234
3719 [49255]: https://github.com/rust-lang/rust/pull/49255
3720 [49299]: https://github.com/rust-lang/rust/pull/49299
3721 [49305]: https://github.com/rust-lang/rust/pull/49305
3722 [49394]: https://github.com/rust-lang/rust/pull/49394
3723 [49458]: https://github.com/rust-lang/rust/pull/49458
3724 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3725 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3726 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3727 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3728 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3729 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3730 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3731 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3732 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3733 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3734 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3735 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3736 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3737 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3738 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3739 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3740 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3741 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3742 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3743 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3744 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3745 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3746 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3747 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3748 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3749 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3750 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3751 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3752 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3753 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3754 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3755 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3756 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3757 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3758 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3759 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3760 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3761 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3762 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3763 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3764 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3765 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3768 Version 1.25.0 (2018-03-29)
3769 ==========================
3773 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3774 - [You can now use nested groups of imports.][47948]
3775 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3776 - [You can now have `|` at the start of a match arm.][47947] e.g.
3778 enum Foo { A, B, C }
3784 | Foo::B => println!("AB"),
3785 | Foo::C => println!("C"),
3792 - [Upgraded to LLVM 6.][47828]
3793 - [Added `-C lto=val` option.][47521]
3794 - [Added `i586-unknown-linux-musl` target][47282]
3798 - [Impl Send for `process::Command` on Unix.][47760]
3799 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3800 - [`UnsafeCell::into_inner` is now safe.][47204]
3801 - [Implement libstd for CloudABI.][47268]
3802 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3803 - [Implement `AsRef<Path>` for Component][46985]
3804 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3805 - [Moved `Duration` to libcore.][46666]
3809 - [`Location::column`]
3812 The following functions can now be used in a constant expression.
3813 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3814 - [`Duration::new`][47300]
3815 - [`Duration::from_secs`][47300]
3816 - [`Duration::from_millis`][47300]
3820 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3821 - [`cargo new` now defaults to creating a binary crate, instead of a
3822 library crate.][cargo/5029]
3826 - [Rust by example is now shipped with new releases][46196]
3830 - [Deprecated `net::lookup_host`.][47510]
3831 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3832 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3833 around indexing operations (see [#47349][47349]). This has been fixed (which also
3834 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3835 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3837 [33903]: https://github.com/rust-lang/rust/pull/33903
3838 [47947]: https://github.com/rust-lang/rust/pull/47947
3839 [47948]: https://github.com/rust-lang/rust/pull/47948
3840 [47760]: https://github.com/rust-lang/rust/pull/47760
3841 [47790]: https://github.com/rust-lang/rust/pull/47790
3842 [47828]: https://github.com/rust-lang/rust/pull/47828
3843 [47398]: https://github.com/rust-lang/rust/pull/47398
3844 [47510]: https://github.com/rust-lang/rust/pull/47510
3845 [47521]: https://github.com/rust-lang/rust/pull/47521
3846 [47204]: https://github.com/rust-lang/rust/pull/47204
3847 [47251]: https://github.com/rust-lang/rust/pull/47251
3848 [47268]: https://github.com/rust-lang/rust/pull/47268
3849 [47282]: https://github.com/rust-lang/rust/pull/47282
3850 [47300]: https://github.com/rust-lang/rust/pull/47300
3851 [47349]: https://github.com/rust-lang/rust/pull/47349
3852 [46931]: https://github.com/rust-lang/rust/pull/46931
3853 [46985]: https://github.com/rust-lang/rust/pull/46985
3854 [47006]: https://github.com/rust-lang/rust/pull/47006
3855 [46830]: https://github.com/rust-lang/rust/pull/46830
3856 [46095]: https://github.com/rust-lang/rust/pull/46095
3857 [46666]: https://github.com/rust-lang/rust/pull/46666
3858 [46196]: https://github.com/rust-lang/rust/pull/46196
3859 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3860 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3861 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3862 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3863 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3866 Version 1.24.1 (2018-03-01)
3867 ==========================
3869 - [Do not abort when unwinding through FFI][48251]
3870 - [Emit UTF-16 files for linker arguments on Windows][48318]
3871 - [Make the error index generator work again][48308]
3872 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3874 [48251]: https://github.com/rust-lang/rust/issues/48251
3875 [48308]: https://github.com/rust-lang/rust/issues/48308
3876 [48318]: https://github.com/rust-lang/rust/issues/48318
3877 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3880 Version 1.24.0 (2018-02-15)
3881 ==========================
3885 - [External `sysv64` ffi is now available.][46528]
3886 eg. `extern "sysv64" fn foo () {}`
3890 - [rustc now uses 16 codegen units by default for release builds.][46910]
3891 For the fastest builds, utilize `codegen-units=1`.
3892 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3893 - [Add `aarch64-unknown-openbsd` support][46760]
3897 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3898 improvement in performance in the majority of cases.
3899 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3900 with Windows.][46798]
3901 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3902 - [impl `From<bool>` for `AtomicBool`][46293]
3903 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3904 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3905 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3906 - [float::from_bits now just uses transmute.][46012] This provides
3907 some optimisations from LLVM.
3908 - [Copied `AsciiExt` methods onto `char`][46077]
3909 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3910 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3911 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3912 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3916 - [`RefCell::replace`]
3918 - [`atomic::spin_loop_hint`]
3920 The following functions can now be used in a constant expression.
3921 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3923 - [`AtomicBool::new`][46287]
3924 - [`AtomicUsize::new`][46287]
3925 - [`AtomicIsize::new`][46287]
3926 - [`AtomicPtr::new`][46287]
3927 - [`Cell::new`][46287]
3928 - [`{integer}::min_value`][46287]
3929 - [`{integer}::max_value`][46287]
3930 - [`mem::size_of`][46287]
3931 - [`mem::align_of`][46287]
3932 - [`ptr::null`][46287]
3933 - [`ptr::null_mut`][46287]
3934 - [`RefCell::new`][46287]
3935 - [`UnsafeCell::new`][46287]
3939 - [Added a `workspace.default-members` config that
3940 overrides implied `--all` in virtual workspaces.][cargo/4743]
3941 - [Enable incremental by default on development builds.][cargo/4817] Also added
3942 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3943 per-project or global basis respectively.
3950 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3951 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3952 in accordance with IETF RFC 4291 §2.2.
3953 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3954 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3955 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3956 - [Leading zeros in tuple struct members is now an error][47084]
3957 - [`column!()` macro is one-based instead of zero-based][46977]
3958 - [`fmt::Arguments` can no longer be shared across threads][45198]
3959 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3960 - [Cargo sets a different working directory for the compiler][cargo/4788]
3962 [44884]: https://github.com/rust-lang/rust/pull/44884
3963 [45198]: https://github.com/rust-lang/rust/pull/45198
3964 [45506]: https://github.com/rust-lang/rust/pull/45506
3965 [45904]: https://github.com/rust-lang/rust/pull/45904
3966 [45990]: https://github.com/rust-lang/rust/pull/45990
3967 [46012]: https://github.com/rust-lang/rust/pull/46012
3968 [46077]: https://github.com/rust-lang/rust/pull/46077
3969 [46094]: https://github.com/rust-lang/rust/pull/46094
3970 [46284]: https://github.com/rust-lang/rust/pull/46284
3971 [46287]: https://github.com/rust-lang/rust/pull/46287
3972 [46293]: https://github.com/rust-lang/rust/pull/46293
3973 [46528]: https://github.com/rust-lang/rust/pull/46528
3974 [46671]: https://github.com/rust-lang/rust/pull/46671
3975 [46713]: https://github.com/rust-lang/rust/pull/46713
3976 [46735]: https://github.com/rust-lang/rust/pull/46735
3977 [46749]: https://github.com/rust-lang/rust/pull/46749
3978 [46760]: https://github.com/rust-lang/rust/pull/46760
3979 [46798]: https://github.com/rust-lang/rust/pull/46798
3980 [46828]: https://github.com/rust-lang/rust/pull/46828
3981 [46831]: https://github.com/rust-lang/rust/pull/46831
3982 [46833]: https://github.com/rust-lang/rust/pull/46833
3983 [46910]: https://github.com/rust-lang/rust/pull/46910
3984 [46977]: https://github.com/rust-lang/rust/pull/46977
3985 [47018]: https://github.com/rust-lang/rust/pull/47018
3986 [47080]: https://github.com/rust-lang/rust/pull/47080
3987 [47084]: https://github.com/rust-lang/rust/pull/47084
3988 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3989 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3990 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3991 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3992 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3993 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3996 Version 1.23.0 (2018-01-04)
3997 ==========================
4001 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
4002 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
4003 Which should fix some confusing errors in some operations.
4007 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4008 undefined behavior.][45920]
4009 - [rustc now suggests renaming import if names clash.][45660]
4010 - [Display errors/warnings correctly when there are zero-width or
4011 wide characters.][45711]
4012 - [rustc now avoids unnecessary copies of arguments that are
4013 simple bindings][45380] This should improve memory usage on average by 5-10%.
4014 - [Updated musl used to build musl rustc to 1.1.17][45393]
4018 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
4019 - [Implement Hash for raw pointers to unsized types][45483]
4020 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
4021 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
4022 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
4023 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
4024 and `<*mut T>::as_mut`][44932]
4025 - [Optimized `Thread::{park, unpark}` implementation][45524]
4026 - [Improved `SliceExt::binary_search` performance.][45333]
4027 - [impl `FromIterator<()>` for `()`][45379]
4028 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
4036 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
4037 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
4038 - [Added unit test checking to `cargo check`][cargo/4592]
4039 - [Cargo now lets you install a specific version
4040 using `cargo install --version`][cargo/4637]
4044 - [Releases now ship with the Cargo book documentation.][45692]
4045 - [rustdoc now prints rendering warnings on every run.][45324]
4049 - [Changes have been made to type equality to make it more correct,
4050 in rare cases this could break some code.][45853] [Tracking issue for
4051 further information][45852]
4052 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
4053 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
4054 Android 9, the minimum supported version is Android 14.
4055 - [Bumped the minimum LLVM to 3.9][45326]
4057 [44042]: https://github.com/rust-lang/rust/pull/44042
4058 [44932]: https://github.com/rust-lang/rust/pull/44932
4059 [45267]: https://github.com/rust-lang/rust/pull/45267
4060 [45324]: https://github.com/rust-lang/rust/pull/45324
4061 [45326]: https://github.com/rust-lang/rust/pull/45326
4062 [45333]: https://github.com/rust-lang/rust/pull/45333
4063 [45379]: https://github.com/rust-lang/rust/pull/45379
4064 [45380]: https://github.com/rust-lang/rust/pull/45380
4065 [45393]: https://github.com/rust-lang/rust/pull/45393
4066 [45435]: https://github.com/rust-lang/rust/pull/45435
4067 [45483]: https://github.com/rust-lang/rust/pull/45483
4068 [45524]: https://github.com/rust-lang/rust/pull/45524
4069 [45571]: https://github.com/rust-lang/rust/pull/45571
4070 [45580]: https://github.com/rust-lang/rust/pull/45580
4071 [45610]: https://github.com/rust-lang/rust/pull/45610
4072 [45660]: https://github.com/rust-lang/rust/pull/45660
4073 [45692]: https://github.com/rust-lang/rust/pull/45692
4074 [45711]: https://github.com/rust-lang/rust/pull/45711
4075 [45772]: https://github.com/rust-lang/rust/pull/45772
4076 [45852]: https://github.com/rust-lang/rust/issues/45852
4077 [45853]: https://github.com/rust-lang/rust/pull/45853
4078 [45887]: https://github.com/rust-lang/rust/pull/45887
4079 [45920]: https://github.com/rust-lang/rust/pull/45920
4080 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
4081 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
4082 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
4085 Version 1.22.1 (2017-11-22)
4086 ==========================
4088 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4090 [46183]: https://github.com/rust-lang/rust/pull/46183
4092 Version 1.22.0 (2017-11-22)
4093 ==========================
4097 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
4098 - [Now accepts underscores in unicode escapes][43716]
4099 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
4100 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
4104 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
4105 - [rustc will no longer inline in codegen units when compiling for debug][45075]
4106 This should decrease compile times for debug builds.
4107 - [strict memory alignment now enabled on ARMv6][45094]
4108 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
4112 - [Allow atomic operations up to 32 bits
4113 on `armv5te_unknown_linux_gnueabi`][44978]
4114 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
4115 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
4116 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
4117 - [Properly detect overflow in `Instant += Duration`.][44220]
4118 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
4119 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
4120 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
4127 - [Cargo will now build multi file examples in subdirectories of the `examples`
4128 folder that have a `main.rs` file.][cargo/4496]
4129 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
4130 the old format will continue to work and can be updated with `cargo update`.
4131 - [Now supports vendoring git repositories][cargo/3992]
4135 - [`libbacktrace` is now available on Apple platforms.][44251]
4136 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
4137 This now lets you specify that a given code example will fail to compile.
4141 - [The minimum Android version that rustc can build for has been bumped
4142 to `4.0` from `2.3`][45656]
4143 - [Allowing `T op= &T` for numeric types has broken some type
4144 inference cases][45480]
4147 [42526]: https://github.com/rust-lang/rust/pull/42526
4148 [43017]: https://github.com/rust-lang/rust/pull/43017
4149 [43716]: https://github.com/rust-lang/rust/pull/43716
4150 [43949]: https://github.com/rust-lang/rust/pull/43949
4151 [44015]: https://github.com/rust-lang/rust/pull/44015
4152 [44220]: https://github.com/rust-lang/rust/pull/44220
4153 [44251]: https://github.com/rust-lang/rust/pull/44251
4154 [44287]: https://github.com/rust-lang/rust/pull/44287
4155 [44303]: https://github.com/rust-lang/rust/pull/44303
4156 [44456]: https://github.com/rust-lang/rust/pull/44456
4157 [44466]: https://github.com/rust-lang/rust/pull/44466
4158 [44895]: https://github.com/rust-lang/rust/pull/44895
4159 [44966]: https://github.com/rust-lang/rust/pull/44966
4160 [44978]: https://github.com/rust-lang/rust/pull/44978
4161 [45041]: https://github.com/rust-lang/rust/pull/45041
4162 [45064]: https://github.com/rust-lang/rust/pull/45064
4163 [45075]: https://github.com/rust-lang/rust/pull/45075
4164 [45094]: https://github.com/rust-lang/rust/pull/45094
4165 [45095]: https://github.com/rust-lang/rust/pull/45095
4166 [45480]: https://github.com/rust-lang/rust/issues/45480
4167 [45656]: https://github.com/rust-lang/rust/pull/45656
4168 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
4169 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
4170 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
4177 Version 1.21.0 (2017-10-12)
4178 ==========================
4182 - [You can now use static references for literals.][43838]
4186 let x: &'static u32 = &0;
4189 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4192 my_macro!(Vec<i32>::new); // Always worked
4193 my_macro!(Vec::<i32>::new); // Now works
4198 - [Upgraded jemalloc to 4.5.0][43911]
4199 - [Enabled unwinding panics on Redox][43917]
4200 - [Now runs LLVM in parallel during translation phase.][43506]
4201 This should reduce peak memory usage.
4205 - [Generate builtin impls for `Clone` for all arrays and tuples that
4206 are `T: Clone`][43690]
4207 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
4208 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
4209 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
4214 [`std::mem::discriminant`]
4218 - [You can now call `cargo install` with multiple package names][cargo/4216]
4219 - [Cargo commands inside a virtual workspace will now implicitly
4220 pass `--all`][cargo/4335]
4221 - [Added a `[patch]` section to `Cargo.toml` to handle
4222 prepublication dependencies][cargo/4123] [RFC 1969]
4223 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
4224 like patterns][cargo/4270]
4225 - [Added the `--all-targets` option][cargo/4400]
4226 - [Using required dependencies as a feature is now deprecated and emits
4227 a warning][cargo/4364]
4232 - [Cargo docs are moving][43916]
4233 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
4234 - [The rustdoc book is now available][43863]
4235 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
4236 - [Added a preview of RLS has been made available through rustup][44204]
4237 Install with `rustup component add rls-preview`
4238 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
4239 Previously only showed `std::os::unix`.
4243 - [Changes in method matching against higher-ranked types][43880] This may cause
4244 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
4245 - [rustc's JSON error output's byte position start at top of file.][42973]
4246 Was previously relative to the rustc's internal `CodeMap` struct which
4247 required the unstable library `libsyntax` to correctly use.
4248 - [`unused_results` lint no longer ignores booleans][43728]
4250 [42565]: https://github.com/rust-lang/rust/pull/42565
4251 [42973]: https://github.com/rust-lang/rust/pull/42973
4252 [43348]: https://github.com/rust-lang/rust/pull/43348
4253 [43459]: https://github.com/rust-lang/rust/pull/43459
4254 [43506]: https://github.com/rust-lang/rust/pull/43506
4255 [43540]: https://github.com/rust-lang/rust/pull/43540
4256 [43690]: https://github.com/rust-lang/rust/pull/43690
4257 [43728]: https://github.com/rust-lang/rust/pull/43728
4258 [43838]: https://github.com/rust-lang/rust/pull/43838
4259 [43863]: https://github.com/rust-lang/rust/pull/43863
4260 [43880]: https://github.com/rust-lang/rust/pull/43880
4261 [43911]: https://github.com/rust-lang/rust/pull/43911
4262 [43916]: https://github.com/rust-lang/rust/pull/43916
4263 [43917]: https://github.com/rust-lang/rust/pull/43917
4264 [44204]: https://github.com/rust-lang/rust/pull/44204
4265 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
4266 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
4267 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4268 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
4269 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
4270 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
4271 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
4272 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
4273 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
4275 Version 1.20.0 (2017-08-31)
4276 ===========================
4280 - [Associated constants are now stabilised.][42809]
4281 - [A lot of macro bugs are now fixed.][42913]
4286 - [Struct fields are now properly coerced to the expected field type.][42807]
4287 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
4288 `wasm32-experimental-emscripten` target.
4289 - [Changed some of the error messages to be more helpful.][42033]
4290 - [Add support for RELRO(RELocation Read-Only) for platforms that support
4292 - [rustc now reports the total number of errors on compilation failure][43015]
4293 previously this was only the number of errors in the pass that failed.
4294 - [Expansion in rustc has been sped up 29x.][42533]
4295 - [added `msp430-none-elf` target.][43099]
4296 - [rustc will now suggest one-argument enum variant to fix type mismatch when
4298 - [Fixes backtraces on Redox][43228]
4299 - [rustc now identifies different versions of same crate when absolute paths of
4300 different types match in an error message.][42826]
4306 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4307 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4309 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
4310 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
4311 - [Impl `Clone` for `DefaultHasher`.][42799]
4312 - [Impl `Sync` for `SyncSender`.][42397]
4313 - [Impl `FromStr` for `char`][42271]
4314 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
4316 - [allow messages in the `unimplemented!()` macro.][42155]
4317 ie. `unimplemented!("Waiting for 1.21 to be stable")`
4318 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
4319 - [Upgrade to Unicode 10.0.0][42999]
4320 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
4321 - [Skip the main thread's manual stack guard on Linux][43072]
4322 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
4323 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
4325 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4330 - [`CStr::into_c_string`]
4331 - [`CString::as_c_str`]
4332 - [`CString::into_boxed_c_str`]
4333 - [`Chain::get_mut`]
4334 - [`Chain::get_ref`]
4335 - [`Chain::into_inner`]
4336 - [`Option::get_or_insert_with`]
4337 - [`Option::get_or_insert`]
4338 - [`OsStr::into_os_string`]
4339 - [`OsString::into_boxed_os_str`]
4342 - [`Utf8Error::error_len`]
4343 - [`char::EscapeDebug`]
4344 - [`char::escape_debug`]
4345 - [`compile_error!`]
4346 - [`f32::from_bits`]
4348 - [`f64::from_bits`]
4350 - [`mem::ManuallyDrop`]
4351 - [`slice::sort_unstable_by_key`]
4352 - [`slice::sort_unstable_by`]
4353 - [`slice::sort_unstable`]
4354 - [`str::from_boxed_utf8_unchecked`]
4355 - [`str::as_bytes_mut`]
4356 - [`str::as_bytes_mut`]
4357 - [`str::from_utf8_mut`]
4358 - [`str::from_utf8_unchecked_mut`]
4360 - [`str::get_unchecked_mut`]
4361 - [`str::get_unchecked`]
4363 - [`str::into_boxed_bytes`]
4368 - [Cargo API token location moved from `~/.cargo/config` to
4369 `~/.cargo/credentials`.][cargo/3978]
4370 - [Cargo will now build `main.rs` binaries that are in sub-directories of
4371 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
4372 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
4373 - [You can now specify version of a binary when installed through
4374 `cargo install` using `--vers`.][cargo/4229]
4375 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
4376 failure.][cargo/4248]
4377 - [Changed the convention around which file is the crate root.][cargo/4259]
4378 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
4379 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
4384 - [Functions with `'static` in their return types will now not be as usable as
4385 if they were using lifetime parameters instead.][42417]
4386 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
4387 takes the sign of NaN into account where previously didn't.][42430]
4389 [42033]: https://github.com/rust-lang/rust/pull/42033
4390 [42155]: https://github.com/rust-lang/rust/pull/42155
4391 [42271]: https://github.com/rust-lang/rust/pull/42271
4392 [42397]: https://github.com/rust-lang/rust/pull/42397
4393 [42417]: https://github.com/rust-lang/rust/pull/42417
4394 [42430]: https://github.com/rust-lang/rust/pull/42430
4395 [42431]: https://github.com/rust-lang/rust/pull/42431
4396 [42533]: https://github.com/rust-lang/rust/pull/42533
4397 [42571]: https://github.com/rust-lang/rust/pull/42571
4398 [42613]: https://github.com/rust-lang/rust/pull/42613
4399 [42799]: https://github.com/rust-lang/rust/pull/42799
4400 [42807]: https://github.com/rust-lang/rust/pull/42807
4401 [42809]: https://github.com/rust-lang/rust/pull/42809
4402 [42822]: https://github.com/rust-lang/rust/pull/42822
4403 [42826]: https://github.com/rust-lang/rust/pull/42826
4404 [42854]: https://github.com/rust-lang/rust/pull/42854
4405 [42913]: https://github.com/rust-lang/rust/pull/42913
4406 [42999]: https://github.com/rust-lang/rust/pull/42999
4407 [43011]: https://github.com/rust-lang/rust/pull/43011
4408 [43015]: https://github.com/rust-lang/rust/pull/43015
4409 [43072]: https://github.com/rust-lang/rust/pull/43072
4410 [43077]: https://github.com/rust-lang/rust/pull/43077
4411 [43097]: https://github.com/rust-lang/rust/pull/43097
4412 [43099]: https://github.com/rust-lang/rust/pull/43099
4413 [43170]: https://github.com/rust-lang/rust/pull/43170
4414 [43178]: https://github.com/rust-lang/rust/pull/43178
4415 [43185]: https://github.com/rust-lang/rust/pull/43185
4416 [43228]: https://github.com/rust-lang/rust/pull/43228
4417 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4418 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4419 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4420 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4421 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4422 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4423 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4424 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4425 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4426 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4427 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4428 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4429 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4430 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4431 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4432 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4433 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4434 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4435 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4436 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4437 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4438 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4439 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4440 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4441 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4442 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4443 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4444 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4445 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4446 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4447 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4448 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4449 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4450 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4451 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4452 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4453 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4454 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4455 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4458 Version 1.19.0 (2017-07-20)
4459 ===========================
4464 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4465 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4466 - [Macro recursion limit increased to 1024 from 64.][41676]
4467 - [Added lint for detecting unused macros.][41907]
4468 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4469 For example: `let x = loop { break 7; };`
4470 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4471 contain `Copy` types and cannot have a `Drop` implementation.
4472 Example: `union Foo { bar: u8, baz: usize }`
4473 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4474 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4479 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4480 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4481 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4482 you should use `--target armv7-linux-androideabi`.
4483 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4484 - [Minor optimisation of string operations.][42037]
4485 - [Compiler error message is now `aborting due to previous error(s)` instead of
4486 `aborting due to N previous errors`][42150] This was previously inaccurate and
4487 would only count certain kinds of errors.
4488 - [The compiler now supports Visual Studio 2017][42225]
4489 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4490 - [Added a lot][42264] of [new error codes][42302]
4491 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4492 libraries with C Run-time Libraries(CRT) to be statically linked.
4493 - [Fixed various ARM codegen bugs][42740]
4498 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4499 `Extend<Cow<'a, str>>`][41449]
4500 - [`Vec` now implements `From<&mut [T]>`][41530]
4501 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4502 - [`SplitWhitespace` now implements `Clone`][41659]
4503 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4505 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4506 macros, but for printing to stderr.
4511 - [`OsString::shrink_to_fit`]
4514 - [`thread::ThreadId`]
4519 - [Build scripts can now add environment variables to the environment
4520 the crate is being compiled in.
4521 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4522 - [Subcommands now replace the current process rather than spawning a new
4523 child process][cargo/3970]
4524 - [Workspace members can now accept glob file patterns][cargo/3979]
4525 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4526 the members in a given workspace.][cargo/3988]
4527 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4528 - [Target directory path is now in the cargo metadata][cargo/4022]
4529 - [Cargo no longer checks out a local working directory for the
4530 crates.io index][cargo/4026] This should provide smaller file size for the
4531 registry, and improve cloning times, especially on Windows machines.
4532 - [Added an `--exclude` option for excluding certain packages when using the
4533 `--all` option][cargo/4031]
4534 - [Cargo will now automatically retry when receiving a 5xx error
4535 from crates.io][cargo/4032]
4536 - [The `--features` option now accepts multiple comma or space
4537 delimited values.][cargo/4084]
4538 - [Added support for custom target specific runners][cargo/3954]
4543 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4545 - [Rust will now release XZ compressed packages][rust-installer/57]
4546 - [rustup will now prefer to download rust packages with
4547 XZ compression][rustup/1100] over GZip packages.
4548 - [Added the ability to escape `#` in rust documentation][41785] By adding
4549 additional `#`'s ie. `##` is now `#`
4554 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4555 - [`-Z` flags are now no longer allowed to be used on the stable
4556 compiler.][41751] This has been a warning for a year previous to this.
4557 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4558 longer works][42844]. Users should migrate to the built-in `check`
4559 command, which has been available since 1.16.
4560 - [Ending a float literal with `._` is now a hard error.
4561 Example: `42._` .][41946]
4562 - [Any use of a private `extern crate` outside of its module is now a
4563 hard error.][36886] This was previously a warning.
4564 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4565 relative while the `::` prefix makes a path absolute, but was ignored and the
4566 path was relative regardless.
4567 - [Floating point constants in match patterns is now a hard error][36890]
4568 This was previously a warning.
4569 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4570 match patterns is now a hard error][36891] This was previously a warning.
4571 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4573 - [From the pound escape, lines consisting of multiple `#`s are
4575 - [It is an error to re-export private enum variants][42460]. This is
4576 known to break a number of crates that depend on an older version of
4578 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4579 to use it to find the linker, and the build will fail where it did
4580 not previously][42607]
4582 [36886]: https://github.com/rust-lang/rust/issues/36886
4583 [36888]: https://github.com/rust-lang/rust/issues/36888
4584 [36890]: https://github.com/rust-lang/rust/issues/36890
4585 [36891]: https://github.com/rust-lang/rust/issues/36891
4586 [36892]: https://github.com/rust-lang/rust/issues/36892
4587 [37406]: https://github.com/rust-lang/rust/issues/37406
4588 [39983]: https://github.com/rust-lang/rust/pull/39983
4589 [41145]: https://github.com/rust-lang/rust/pull/41145
4590 [41192]: https://github.com/rust-lang/rust/pull/41192
4591 [41258]: https://github.com/rust-lang/rust/pull/41258
4592 [41370]: https://github.com/rust-lang/rust/pull/41370
4593 [41449]: https://github.com/rust-lang/rust/pull/41449
4594 [41530]: https://github.com/rust-lang/rust/pull/41530
4595 [41624]: https://github.com/rust-lang/rust/pull/41624
4596 [41656]: https://github.com/rust-lang/rust/pull/41656
4597 [41659]: https://github.com/rust-lang/rust/pull/41659
4598 [41676]: https://github.com/rust-lang/rust/pull/41676
4599 [41751]: https://github.com/rust-lang/rust/pull/41751
4600 [41764]: https://github.com/rust-lang/rust/pull/41764
4601 [41785]: https://github.com/rust-lang/rust/pull/41785
4602 [41873]: https://github.com/rust-lang/rust/pull/41873
4603 [41907]: https://github.com/rust-lang/rust/pull/41907
4604 [41946]: https://github.com/rust-lang/rust/pull/41946
4605 [42016]: https://github.com/rust-lang/rust/pull/42016
4606 [42037]: https://github.com/rust-lang/rust/pull/42037
4607 [42068]: https://github.com/rust-lang/rust/pull/42068
4608 [42150]: https://github.com/rust-lang/rust/pull/42150
4609 [42162]: https://github.com/rust-lang/rust/pull/42162
4610 [42225]: https://github.com/rust-lang/rust/pull/42225
4611 [42264]: https://github.com/rust-lang/rust/pull/42264
4612 [42302]: https://github.com/rust-lang/rust/pull/42302
4613 [42460]: https://github.com/rust-lang/rust/issues/42460
4614 [42607]: https://github.com/rust-lang/rust/issues/42607
4615 [42740]: https://github.com/rust-lang/rust/pull/42740
4616 [42844]: https://github.com/rust-lang/rust/issues/42844
4617 [42948]: https://github.com/rust-lang/rust/pull/42948
4618 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4619 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4620 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4621 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4622 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4623 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4624 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4625 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4626 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4627 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4628 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4629 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4630 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4631 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4632 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4633 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4634 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4635 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4636 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4637 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4638 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4639 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4642 Version 1.18.0 (2017-06-08)
4643 ===========================
4648 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4649 make the item visible to just that module tree. Also accepts the keyword
4650 `crate` to make something public to the whole crate but not users of the
4651 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4652 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4653 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4654 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4655 types like `Write + Send`, trailing `+` are now supported in trait objects,
4656 and better error reporting for trait objects starting with `?Sized`.
4657 - [0e+10 is now a valid floating point literal][40589]
4658 - [Now warns if you bind a lifetime parameter to 'static][40734]
4659 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4660 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4661 representation in some cases.][40377]
4666 - [rustc can now emit mir with `--emit mir`][39891]
4667 - [Improved LLVM IR for trivial functions][40367]
4668 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4669 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4670 opportunities found through profiling
4671 - [Improved backtrace formatting when panicking][38165]
4676 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4677 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4678 iteration or reallocation.
4679 - [Simplified HashMap Bucket interface][40561] provides performance
4680 improvements for iterating and cloning.
4681 - [Specialize Vec::from_elem to use calloc][40409]
4682 - [Fixed Race condition in fs::create_dir_all][39799]
4683 - [No longer caching stdio on Windows][40516]
4684 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4685 2.50%~ faster and in one case now 12.50% faster.
4686 - [Optimized `AtomicBool::fetch_nand`][41143]
4691 - [`Child::try_wait`]
4692 - [`HashMap::retain`]
4693 - [`HashSet::retain`]
4695 - [`TcpStream::peek`]
4696 - [`UdpSocket::peek`]
4697 - [`UdpSocket::peek_from`]
4702 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4703 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4704 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4705 - [Added Android build support][cargo/3885]
4706 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4707 of a certain type, for example `cargo build --bins` will build all
4709 - [Added support for haiku][cargo/3952]
4714 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4715 - [Added rust-windbg script for better debugging on Windows][39983]
4716 - [Rust now uses the official cross compiler for NetBSD][40612]
4717 - [rustdoc now accepts `#` at the start of files][40828]
4718 - [Fixed jemalloc support for musl][41168]
4723 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4724 always placed after the sign if it exists and before the digits. With the `#`
4725 flag the zeroes are placed after the prefix and before the digits.
4726 - [Due to the struct field optimisation][40377], using `transmute` on structs
4727 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4728 always been undefined behavior, but is now more likely to break in practice.
4729 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4730 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4731 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4732 - [Overlapping inherent `impl`s are now a hard error][40728]
4733 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4734 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4735 `out.asm` and `out.ll` instead of only one of the filetypes.
4736 - [ calling a function that returns `Self` will no longer work][41805] when
4737 the size of `Self` cannot be statically determined.
4738 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4739 this has caused a few regressions namely:
4741 - Changed the link order of local static/dynamic libraries (respecting the
4742 order on given rather than having the compiler reorder).
4743 - Changed how MinGW is linked, native code linked to dynamic libraries
4744 may require manually linking to the gcc support library (for the native
4747 [38165]: https://github.com/rust-lang/rust/pull/38165
4748 [39799]: https://github.com/rust-lang/rust/pull/39799
4749 [39891]: https://github.com/rust-lang/rust/pull/39891
4750 [39983]: https://github.com/rust-lang/rust/pull/39983
4751 [40043]: https://github.com/rust-lang/rust/pull/40043
4752 [40241]: https://github.com/rust-lang/rust/pull/40241
4753 [40338]: https://github.com/rust-lang/rust/pull/40338
4754 [40367]: https://github.com/rust-lang/rust/pull/40367
4755 [40377]: https://github.com/rust-lang/rust/pull/40377
4756 [40409]: https://github.com/rust-lang/rust/pull/40409
4757 [40516]: https://github.com/rust-lang/rust/pull/40516
4758 [40556]: https://github.com/rust-lang/rust/pull/40556
4759 [40561]: https://github.com/rust-lang/rust/pull/40561
4760 [40589]: https://github.com/rust-lang/rust/pull/40589
4761 [40612]: https://github.com/rust-lang/rust/pull/40612
4762 [40723]: https://github.com/rust-lang/rust/pull/40723
4763 [40728]: https://github.com/rust-lang/rust/pull/40728
4764 [40731]: https://github.com/rust-lang/rust/pull/40731
4765 [40734]: https://github.com/rust-lang/rust/pull/40734
4766 [40805]: https://github.com/rust-lang/rust/pull/40805
4767 [40807]: https://github.com/rust-lang/rust/pull/40807
4768 [40828]: https://github.com/rust-lang/rust/pull/40828
4769 [40870]: https://github.com/rust-lang/rust/pull/40870
4770 [41085]: https://github.com/rust-lang/rust/pull/41085
4771 [41143]: https://github.com/rust-lang/rust/pull/41143
4772 [41168]: https://github.com/rust-lang/rust/pull/41168
4773 [41270]: https://github.com/rust-lang/rust/issues/41270
4774 [41469]: https://github.com/rust-lang/rust/pull/41469
4775 [41805]: https://github.com/rust-lang/rust/issues/41805
4776 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4777 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4778 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4779 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4780 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4781 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4782 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4783 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4784 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4785 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4786 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4787 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4788 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4789 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4792 Version 1.17.0 (2017-04-27)
4793 ===========================
4798 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4799 * [Fields of structs may be initialized without duplicating the field/variable
4800 names][39761]. [RFC 1682]
4801 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4802 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4803 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4804 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4805 `'b`. Soundness fix.
4806 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4807 * [Static variables may contain references to other statics][40027]
4812 * [Exit quickly on only `--emit dep-info`][40336]
4813 * [Make `-C relocation-model` more correctly determine whether the linker
4814 creates a position-independent executable][40245]
4815 * [Add `-C overflow-checks` to directly control whether integer overflow
4817 * [The rustc type checker now checks items on demand instead of in a single
4818 in-order pass][40008]. This is mostly an internal refactoring in support of
4819 future work, including incremental type checking, but also resolves [RFC
4820 1647], allowing `Self` to appear in `impl` `where` clauses.
4821 * [Optimize vtable loads][39995]
4822 * [Turn off vectorization for Emscripten targets][39990]
4823 * [Provide suggestions for unknown macros imported with `use`][39953]
4824 * [Fix ICEs in path resolution][39939]
4825 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4826 * [Add clearer error message using `&str + &str`][39116]
4837 * [`Ordering::then`]
4838 * [`Ordering::then_with`]
4839 * [`BTreeMap::range`]
4840 * [`BTreeMap::range_mut`]
4841 * [`collections::Bound`]
4842 * [`process::abort`]
4843 * [`ptr::read_unaligned`]
4844 * [`ptr::write_unaligned`]
4845 * [`Result::expect_err`]
4848 * [`Cell::into_inner`]
4854 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4855 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4856 * [`String` implements `FromIterator<&char>`][40028]
4857 * `Box` [implements][40009] a number of new conversions:
4858 `From<Box<str>> for String`,
4859 `From<Box<[T]>> for Vec<T>`,
4860 `From<Box<CStr>> for CString`,
4861 `From<Box<OsStr>> for OsString`,
4862 `From<Box<Path>> for PathBuf`,
4863 `Into<Box<str>> for String`,
4864 `Into<Box<[T]>> for Vec<T>`,
4865 `Into<Box<CStr>> for CString`,
4866 `Into<Box<OsStr>> for OsString`,
4867 `Into<Box<Path>> for PathBuf`,
4868 `Default for Box<str>`,
4869 `Default for Box<CStr>`,
4870 `Default for Box<OsStr>`,
4871 `From<&CStr> for Box<CStr>`,
4872 `From<&OsStr> for Box<OsStr>`,
4873 `From<&Path> for Box<Path>`
4874 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4875 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4876 * [Slightly optimize `slice::sort`][39538]
4877 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4878 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4879 `Box<str>` implements `From<&str>`][39438]
4880 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4881 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4882 * [`format!` estimates the needed capacity before writing a string][39356]
4883 * [Support unprivileged symlink creation in Windows][38921]
4884 * [`PathBuf` implements `Default`][38764]
4885 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4886 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4887 and poor hash functions.
4892 * [Add `cargo check --all`][cargo/3731]
4893 * [Add an option to ignore SSL revocation checking][cargo/3699]
4894 * [Add `cargo run --package`][cargo/3691]
4895 * [Add `required_features`][cargo/3667]
4896 * [Assume `build.rs` is a build script][cargo/3664]
4897 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4902 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4904 * [The "Unstable Book" documents nightly-only features][ubook]
4905 * [Improve the style of the sidebar in rustdoc output][40265]
4906 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4907 * [Fix MSP430 breakage due to `i128`][40257]
4908 * [Preliminary Solaris/SPARCv9 support][39903]
4909 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4910 run without installing the MSVC runtime.
4911 * [`rustdoc --test` includes file names in test names][39788]
4912 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4913 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4914 * [Initial support for `aarch64-unknown-freebsd`][39491]
4915 * [Initial support for `i686-unknown-netbsd`][39426]
4916 * [This release no longer includes the old makefile build system][39431]. Rust
4917 is built with a custom build system, written in Rust, and with Cargo.
4918 * [Add Debug implementations for libcollection structs][39002]
4919 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4920 * [`--test-threads=0` produces an error][38945]
4921 * [`rustup` installs documentation by default][40526]
4922 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4923 WinDbg and Visual Studio to improve the debugging experience.
4928 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4929 workaround, either use MSVC 2015 or run vcvars.bat.
4930 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4931 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4932 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4934 * [`format!` and `Display::to_string` panic if an underlying formatting
4935 implementation returns an error][40117]. Previously the error was silently
4936 ignored. It is incorrect for `write_fmt` to return an error when writing
4938 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4939 crates were marked stable and could be accessed from the stable toolchain.
4940 * [Rust git source no longer includes vendored crates][39728]. Those that need
4941 to build with vendored crates should build from release tarballs.
4942 * [Fix inert attributes from `proc_macro_derives`][39572]
4943 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4944 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4946 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4947 existing code generally ignores the type of dead-code unless a type-hint is
4948 provided; this can cause surprising inference interactions particularly around
4949 defaulting. The new code uniformly ignores the result type of dead-code.
4950 * [Tuple-struct constructors with private fields are no longer visible][38932]
4951 * [Lifetime parameters that do not appear in the arguments are now considered
4952 early-bound][38897], resolving a soundness bug (#[32330]). The
4953 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4955 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4956 * [Make transmuting from fn item types to pointer-sized types a hard
4959 [27787]: https://github.com/rust-lang/rust/issues/27787
4960 [32330]: https://github.com/rust-lang/rust/issues/32330
4961 [34198]: https://github.com/rust-lang/rust/pull/34198
4962 [38161]: https://github.com/rust-lang/rust/pull/38161
4963 [38368]: https://github.com/rust-lang/rust/pull/38368
4964 [38584]: https://github.com/rust-lang/rust/issues/38584
4965 [38661]: https://github.com/rust-lang/rust/pull/38661
4966 [38764]: https://github.com/rust-lang/rust/pull/38764
4967 [38864]: https://github.com/rust-lang/rust/issues/38864
4968 [38897]: https://github.com/rust-lang/rust/pull/38897
4969 [38921]: https://github.com/rust-lang/rust/pull/38921
4970 [38932]: https://github.com/rust-lang/rust/pull/38932
4971 [38945]: https://github.com/rust-lang/rust/pull/38945
4972 [38981]: https://github.com/rust-lang/rust/pull/38981
4973 [39002]: https://github.com/rust-lang/rust/pull/39002
4974 [39116]: https://github.com/rust-lang/rust/pull/39116
4975 [39193]: https://github.com/rust-lang/rust/pull/39193
4976 [39265]: https://github.com/rust-lang/rust/pull/39265
4977 [39356]: https://github.com/rust-lang/rust/pull/39356
4978 [39372]: https://github.com/rust-lang/rust/pull/39372
4979 [39426]: https://github.com/rust-lang/rust/pull/39426
4980 [39431]: https://github.com/rust-lang/rust/pull/39431
4981 [39438]: https://github.com/rust-lang/rust/pull/39438
4982 [39440]: https://github.com/rust-lang/rust/pull/39440
4983 [39485]: https://github.com/rust-lang/rust/pull/39485
4984 [39491]: https://github.com/rust-lang/rust/pull/39491
4985 [39518]: https://github.com/rust-lang/rust/pull/39518
4986 [39538]: https://github.com/rust-lang/rust/pull/39538
4987 [39572]: https://github.com/rust-lang/rust/pull/39572
4988 [39633]: https://github.com/rust-lang/rust/pull/39633
4989 [39642]: https://github.com/rust-lang/rust/pull/39642
4990 [39728]: https://github.com/rust-lang/rust/pull/39728
4991 [39761]: https://github.com/rust-lang/rust/pull/39761
4992 [39788]: https://github.com/rust-lang/rust/pull/39788
4993 [39793]: https://github.com/rust-lang/rust/pull/39793
4994 [39837]: https://github.com/rust-lang/rust/pull/39837
4995 [39843]: https://github.com/rust-lang/rust/pull/39843
4996 [39851]: https://github.com/rust-lang/rust/pull/39851
4997 [39903]: https://github.com/rust-lang/rust/pull/39903
4998 [39939]: https://github.com/rust-lang/rust/pull/39939
4999 [39953]: https://github.com/rust-lang/rust/pull/39953
5000 [39960]: https://github.com/rust-lang/rust/pull/39960
5001 [39990]: https://github.com/rust-lang/rust/pull/39990
5002 [39995]: https://github.com/rust-lang/rust/pull/39995
5003 [40008]: https://github.com/rust-lang/rust/pull/40008
5004 [40009]: https://github.com/rust-lang/rust/pull/40009
5005 [40027]: https://github.com/rust-lang/rust/pull/40027
5006 [40028]: https://github.com/rust-lang/rust/pull/40028
5007 [40037]: https://github.com/rust-lang/rust/pull/40037
5008 [40117]: https://github.com/rust-lang/rust/pull/40117
5009 [40166]: https://github.com/rust-lang/rust/pull/40166
5010 [40245]: https://github.com/rust-lang/rust/pull/40245
5011 [40257]: https://github.com/rust-lang/rust/pull/40257
5012 [40261]: https://github.com/rust-lang/rust/pull/40261
5013 [40265]: https://github.com/rust-lang/rust/pull/40265
5014 [40319]: https://github.com/rust-lang/rust/pull/40319
5015 [40336]: https://github.com/rust-lang/rust/pull/40336
5016 [40526]: https://github.com/rust-lang/rust/pull/40526
5017 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5018 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
5019 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
5020 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
5021 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
5022 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
5023 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
5024 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
5025 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
5026 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
5027 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
5028 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
5029 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
5030 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
5031 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
5032 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
5033 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
5034 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
5035 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
5036 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
5037 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
5038 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
5039 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
5040 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
5041 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
5042 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
5043 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
5044 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
5045 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
5046 [mdbook]: https://crates.io/crates/mdbook
5047 [ubook]: https://doc.rust-lang.org/unstable-book/
5050 Version 1.16.0 (2017-03-16)
5051 ===========================
5056 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5057 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5058 match patterns][38069]
5059 * [Clean up semantics of `self` in an import list][38313]
5060 * [`Self` may appear in `impl` headers][38920]
5061 * [`Self` may appear in struct expressions][39282]
5066 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
5067 a `.rmeta` file containing only crate metadata][38571]. This can be
5068 used by tools like the Rust Language Service to perform
5069 metadata-only builds.
5070 * [Levenshtein based typo suggestions now work in most places, while
5071 previously they worked only for fields and sometimes for local
5072 variables][38927]. Together with the overhaul of "no
5073 resolution"/"unexpected resolution" errors (#[38154]) they result in
5074 large and systematic improvement in resolution diagnostics.
5075 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
5077 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
5078 * [`rustc` no longer attempts to provide "consider using an explicit
5079 lifetime" suggestions][37057]. They were inaccurate.
5084 * [`VecDeque::truncate`]
5085 * [`VecDeque::resize`]
5086 * [`String::insert_str`]
5087 * [`Duration::checked_add`]
5088 * [`Duration::checked_sub`]
5089 * [`Duration::checked_div`]
5090 * [`Duration::checked_mul`]
5093 * [`SocketAddr::is_ipv4`]
5094 * [`SocketAddr::is_ipv6`]
5095 * [`IpAddr::is_ipv4`]
5096 * [`IpAddr::is_ipv6`]
5098 * [`Vec::dedup_by_key`]
5099 * [`Result::unwrap_or_default`]
5100 * [`<*const T>::wrapping_offset`]
5101 * [`<*mut T>::wrapping_offset`]
5102 * `CommandExt::creation_flags`
5103 * [`File::set_permissions`]
5104 * [`String::split_off`]
5109 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
5110 their argument by `Borrow` parameter][37761]
5111 * [All public types in std implement `Debug`][38006]
5112 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
5113 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
5114 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5116 * [std: Fix partial writes in `LineWriter`][38062]
5117 * [std: Clamp max read/write sizes on Unix][38062]
5118 * [Use more specific panic message for `&str` slicing errors][38066]
5119 * [`TcpListener::set_only_v6` is deprecated][38304]. This
5120 functionality cannot be achieved in std currently.
5121 * [`writeln!`, like `println!`, now accepts a form with no string
5122 or formatting arguments, to just print a newline][38469]
5123 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
5124 * [Reduce the size of static data in `std_unicode::tables`][38781]
5125 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
5126 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
5128 * [`Duration` implements `Sum`][38712]
5129 * [`String` implements `ToSocketAddrs`][39048]
5134 * [The `cargo check` command does a type check of a project without
5135 building it][cargo/3296]
5136 * [crates.io will display CI badges from Travis and AppVeyor, if
5137 specified in Cargo.toml][cargo/3546]
5138 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
5139 * [Compilation profiles accept integer values for `debug`, in addition
5140 to `true` and `false`. These are passed to `rustc` as the value to
5141 `-C debuginfo`][cargo/3534]
5142 * [Implement `cargo --version --verbose`][cargo/3604]
5143 * [All builds now output 'dep-info' build dependencies compatible with
5144 make and ninja][cargo/3557]
5145 * [Build all workspace members with `build --all`][cargo/3511]
5146 * [Document all workspace members with `doc --all`][cargo/3515]
5147 * [Path deps outside workspace are not members][cargo/3443]
5152 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
5153 the path to the Rust implementation][38589]
5154 * [The `armv7-linux-androideabi` target no longer enables NEON
5155 extensions, per Google's ABI guide][38413]
5156 * [The stock standard library can be compiled for Redox OS][38401]
5157 * [Rust has initial SPARC support][38726]. Tier 3. No builds
5159 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5161 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5166 * [Uninhabitable enums (those without any variants) no longer permit wildcard
5167 match patterns][38069]
5168 * In this release, references to uninhabited types can not be
5169 pattern-matched. This was accidentally allowed in 1.15.
5170 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
5171 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
5173 * [Clean up semantics of `self` in an import list][38313]
5174 * Reimplemented lifetime elision. This change was almost entirely compatible
5175 with existing code, but it did close a number of small bugs and loopholes,
5176 as well as being more accepting in some other [cases][41105].
5178 [37057]: https://github.com/rust-lang/rust/pull/37057
5179 [37761]: https://github.com/rust-lang/rust/pull/37761
5180 [38006]: https://github.com/rust-lang/rust/pull/38006
5181 [38051]: https://github.com/rust-lang/rust/pull/38051
5182 [38062]: https://github.com/rust-lang/rust/pull/38062
5183 [38062]: https://github.com/rust-lang/rust/pull/38622
5184 [38066]: https://github.com/rust-lang/rust/pull/38066
5185 [38069]: https://github.com/rust-lang/rust/pull/38069
5186 [38131]: https://github.com/rust-lang/rust/pull/38131
5187 [38154]: https://github.com/rust-lang/rust/pull/38154
5188 [38274]: https://github.com/rust-lang/rust/pull/38274
5189 [38304]: https://github.com/rust-lang/rust/pull/38304
5190 [38313]: https://github.com/rust-lang/rust/pull/38313
5191 [38314]: https://github.com/rust-lang/rust/pull/38314
5192 [38327]: https://github.com/rust-lang/rust/pull/38327
5193 [38401]: https://github.com/rust-lang/rust/pull/38401
5194 [38413]: https://github.com/rust-lang/rust/pull/38413
5195 [38469]: https://github.com/rust-lang/rust/pull/38469
5196 [38559]: https://github.com/rust-lang/rust/pull/38559
5197 [38571]: https://github.com/rust-lang/rust/pull/38571
5198 [38580]: https://github.com/rust-lang/rust/pull/38580
5199 [38589]: https://github.com/rust-lang/rust/pull/38589
5200 [38670]: https://github.com/rust-lang/rust/pull/38670
5201 [38712]: https://github.com/rust-lang/rust/pull/38712
5202 [38726]: https://github.com/rust-lang/rust/pull/38726
5203 [38781]: https://github.com/rust-lang/rust/pull/38781
5204 [38798]: https://github.com/rust-lang/rust/pull/38798
5205 [38909]: https://github.com/rust-lang/rust/pull/38909
5206 [38920]: https://github.com/rust-lang/rust/pull/38920
5207 [38927]: https://github.com/rust-lang/rust/pull/38927
5208 [39048]: https://github.com/rust-lang/rust/pull/39048
5209 [39282]: https://github.com/rust-lang/rust/pull/39282
5210 [39379]: https://github.com/rust-lang/rust/pull/39379
5211 [41105]: https://github.com/rust-lang/rust/issues/41105
5212 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5213 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
5214 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
5215 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
5216 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
5217 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
5218 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
5219 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
5220 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
5221 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
5222 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
5223 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
5224 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
5225 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
5226 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
5227 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
5228 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
5229 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
5230 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
5231 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
5232 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
5233 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
5234 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
5235 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
5236 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
5237 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
5238 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
5239 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
5240 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
5241 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
5244 Version 1.15.1 (2017-02-09)
5245 ===========================
5247 * [Fix IntoIter::as_mut_slice's signature][39466]
5248 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5250 [39466]: https://github.com/rust-lang/rust/pull/39466
5251 [39523]: https://github.com/rust-lang/rust/pull/39523
5254 Version 1.15.0 (2017-02-02)
5255 ===========================
5260 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
5261 stable. This allows popular code-generating crates like Serde and Diesel to
5262 work ergonomically. [RFC 1681].
5263 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
5264 with curly braces][36868]. Part of [RFC 1506].
5265 * [A number of minor changes to name resolution have been activated][37127].
5266 They add up to more consistent semantics, allowing for future evolution of
5267 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5268 details of what is different. The breaking changes here have been transitioned
5269 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5270 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
5272 * [`?Sized` can be used in `where` clauses][37791]
5273 * [There is now a limit on the size of monomorphized types and it can be
5274 modified with the `#![type_size_limit]` crate attribute, similarly to
5275 the `#![recursion_limit]` attribute][37789]
5280 * [On Windows, the compiler will apply dllimport attributes when linking to
5281 extern functions][37973]. Additional attributes and flags can control which
5282 library kind is linked and its name. [RFC 1717].
5283 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5284 * [The `--test` flag works with procedural macro crates][38107]
5285 * [Fix `extern "aapcs" fn` ABI][37814]
5286 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
5287 * [The `format!` expander recognizes incorrect `printf` and shell-style
5288 formatting directives and suggests the correct format][37613].
5289 * [Only report one error for all unused imports in an import list][37456]
5291 Compiler Performance
5292 --------------------
5294 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
5295 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
5296 * [Don't clone in `UnificationTable::probe`][37848]
5297 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
5298 * [Use small vectors in type walker][37760]
5299 * [Macro expansion performance was improved][37701]
5300 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
5301 * [Replace FNV with a faster hash function][37229]
5306 * [`std::iter::Iterator::min_by`]
5307 * [`std::iter::Iterator::max_by`]
5308 * [`std::os::*::fs::FileExt`]
5309 * [`std::sync::atomic::Atomic*::get_mut`]
5310 * [`std::sync::atomic::Atomic*::into_inner`]
5311 * [`std::vec::IntoIter::as_slice`]
5312 * [`std::vec::IntoIter::as_mut_slice`]
5313 * [`std::sync::mpsc::Receiver::try_iter`]
5314 * [`std::os::unix::process::CommandExt::before_exec`]
5315 * [`std::rc::Rc::strong_count`]
5316 * [`std::rc::Rc::weak_count`]
5317 * [`std::sync::Arc::strong_count`]
5318 * [`std::sync::Arc::weak_count`]
5319 * [`std::char::encode_utf8`]
5320 * [`std::char::encode_utf16`]
5321 * [`std::cell::Ref::clone`]
5322 * [`std::io::Take::into_inner`]
5327 * [The standard sorting algorithm has been rewritten for dramatic performance
5328 improvements][38192]. It is a hybrid merge sort, drawing influences from
5329 Timsort. Previously it was a naive merge sort.
5330 * [`Iterator::nth` no longer has a `Sized` bound][38134]
5331 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
5333 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
5334 and `char_indices().last()`][37882]
5335 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
5336 * [Chinese characters display correctly in `fmt::Debug`][37855]
5337 * [Derive `Default` for `Duration`][37699]
5338 * [Support creation of anonymous pipes on WinXP/2k][37677]
5339 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
5340 * [Don't pass overlapped handles to processes][38835]
5345 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5346 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5347 should instead check the variable at runtime with `std::env`. That the value
5348 was set at build time was a bug, and incorrect when cross-compiling. This
5349 change is known to cause breakage.
5350 * [Add `--all` flag to `cargo test`][cargo/3221]
5351 * [Compile statically against the MSVC CRT][cargo/3363]
5352 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
5353 * [Link OpenSSL statically on OSX][cargo/3311]
5354 * [Apply new fingerprinting to build dir outputs][cargo/3310]
5355 * [Test for bad path overrides with summaries][cargo/3336]
5356 * [Require `cargo install --vers` to take a semver version][cargo/3338]
5357 * [Fix retrying crate downloads for network errors][cargo/3348]
5358 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
5359 * [Emit more info on --message-format=json][cargo/3319]
5360 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
5361 * [Don't ignore errors in workspace manifest][cargo/3409]
5362 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
5367 * [Test runners (binaries built with `--test`) now support a `--list` argument
5368 that lists the tests it contains][38185]
5369 * [Test runners now support a `--exact` argument that makes the test filter
5370 match exactly, instead of matching only a substring of the test name][38181]
5371 * [rustdoc supports a `--playground-url` flag][37763]
5372 * [rustdoc provides more details about `#[should_panic]` errors][37749]
5377 * [The Rust build system is now written in Rust][37817]. The Makefiles may
5378 continue to be used in this release by passing `--disable-rustbuild` to the
5379 configure script, but they will be deleted soon. Note that the new build
5380 system uses a different on-disk layout that will likely affect any scripts
5382 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5384 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
5385 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
5391 * [A number of minor changes to name resolution have been activated][37127].
5392 They add up to more consistent semantics, allowing for future evolution of
5393 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
5394 details of what is different. The breaking changes here have been transitioned
5395 through the [`legacy_imports`] lint since 1.14, with no known regressions.
5396 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
5397 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
5398 should instead check the variable at runtime with `std::env`. That the value
5399 was set at build time was a bug, and incorrect when cross-compiling. This
5400 change is known to cause breakage.
5401 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
5402 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
5403 1.10 and is now an error by default. It will become a hard error in the near
5405 * [The semantics relating modules to file system directories are changing in
5406 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
5407 lint, which is a warning in this release, and will become a hard error in the
5409 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
5410 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
5411 the underlying iterator][37834]
5413 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
5414 [33685]: https://github.com/rust-lang/rust/issues/33685
5415 [36868]: https://github.com/rust-lang/rust/pull/36868
5416 [37127]: https://github.com/rust-lang/rust/pull/37127
5417 [37229]: https://github.com/rust-lang/rust/pull/37229
5418 [37456]: https://github.com/rust-lang/rust/pull/37456
5419 [37527]: https://github.com/rust-lang/rust/pull/37527
5420 [37602]: https://github.com/rust-lang/rust/pull/37602
5421 [37613]: https://github.com/rust-lang/rust/pull/37613
5422 [37615]: https://github.com/rust-lang/rust/pull/37615
5423 [37636]: https://github.com/rust-lang/rust/pull/37636
5424 [37627]: https://github.com/rust-lang/rust/pull/37627
5425 [37642]: https://github.com/rust-lang/rust/pull/37642
5426 [37677]: https://github.com/rust-lang/rust/pull/37677
5427 [37699]: https://github.com/rust-lang/rust/pull/37699
5428 [37701]: https://github.com/rust-lang/rust/pull/37701
5429 [37705]: https://github.com/rust-lang/rust/pull/37705
5430 [37749]: https://github.com/rust-lang/rust/pull/37749
5431 [37760]: https://github.com/rust-lang/rust/pull/37760
5432 [37763]: https://github.com/rust-lang/rust/pull/37763
5433 [37764]: https://github.com/rust-lang/rust/pull/37764
5434 [37789]: https://github.com/rust-lang/rust/pull/37789
5435 [37791]: https://github.com/rust-lang/rust/pull/37791
5436 [37814]: https://github.com/rust-lang/rust/pull/37814
5437 [37817]: https://github.com/rust-lang/rust/pull/37817
5438 [37834]: https://github.com/rust-lang/rust/pull/37834
5439 [37848]: https://github.com/rust-lang/rust/pull/37848
5440 [37855]: https://github.com/rust-lang/rust/pull/37855
5441 [37882]: https://github.com/rust-lang/rust/pull/37882
5442 [37888]: https://github.com/rust-lang/rust/pull/37888
5443 [37973]: https://github.com/rust-lang/rust/pull/37973
5444 [37979]: https://github.com/rust-lang/rust/pull/37979
5445 [38086]: https://github.com/rust-lang/rust/pull/38086
5446 [38107]: https://github.com/rust-lang/rust/pull/38107
5447 [38117]: https://github.com/rust-lang/rust/pull/38117
5448 [38134]: https://github.com/rust-lang/rust/pull/38134
5449 [38146]: https://github.com/rust-lang/rust/pull/38146
5450 [38181]: https://github.com/rust-lang/rust/pull/38181
5451 [38182]: https://github.com/rust-lang/rust/pull/38182
5452 [38185]: https://github.com/rust-lang/rust/pull/38185
5453 [38192]: https://github.com/rust-lang/rust/pull/38192
5454 [38279]: https://github.com/rust-lang/rust/pull/38279
5455 [38835]: https://github.com/rust-lang/rust/pull/38835
5456 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5457 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5458 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5459 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5460 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5461 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5462 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5463 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5464 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5465 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5466 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5467 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5468 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5469 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5470 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5471 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5472 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5473 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5474 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5475 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5476 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5477 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5478 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5479 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5480 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5481 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5482 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5483 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5484 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5485 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5486 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5487 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5488 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5489 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5490 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5491 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5492 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5493 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5496 Version 1.14.0 (2016-12-22)
5497 ===========================
5502 * [`..` matches multiple tuple fields in enum variants, structs
5503 and tuples][36843]. [RFC 1492].
5504 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5505 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5506 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5507 dereferencing][36822]
5512 * [Mark enums with non-zero discriminant as non-zero][37224]
5513 * [Lower-case `static mut` names are linted like other
5514 statics and consts][37162]
5515 * [Fix ICE on some macros in const integer positions
5516 (e.g. `[u8; m!()]`)][36819]
5517 * [Improve error message and snippet for "did you mean `x`"][36798]
5518 * [Add a panic-strategy field to the target specification][36794]
5519 * [Include LLVM version in `--version --verbose`][37200]
5521 Compile-time Optimizations
5522 --------------------------
5524 * [Improve macro expansion performance][37569]
5525 * [Shrink `Expr_::ExprInlineAsm`][37445]
5526 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5527 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5528 * [Avoid more allocations when compiling html5ever][37373]
5529 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5530 * [Avoid some allocations in the macro parser][37318]
5531 * [Use a faster deflate setting][37298]
5532 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5533 during interning of slices][37270]
5534 * [Optimize `write_metadata`][37267]
5535 * [Don't process obligation forest cycles when stalled][37231]
5536 * [Avoid many `CrateConfig` clones][37161]
5537 * [Optimize `Substs::super_fold_with`][37108]
5538 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5539 * [Speed up `plug_leaks`][36917]
5544 * [`println!()`, with no arguments, prints newline][36825].
5545 Previously, an empty string was required to achieve the same.
5546 * [`Wrapping` impls standard binary and unary operators, as well as
5547 the `Sum` and `Product` iterators][37356]
5548 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5550 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5551 `VecDeque` iterators][37315]
5552 * [Improve `SipHasher` performance on small values][37312]
5553 * [Add Iterator trait TrustedLen to enable better FromIterator /
5555 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5556 * [`ReadDir` implements `Debug`][37221]
5557 * [Implement `RefUnwindSafe` for atomic types][37178]
5558 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5559 * [Avoid allocations in `Decoder::read_str`][37064]
5560 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5561 * [Impl `Debug` for raw pointers to unsized data][36880]
5562 * [Don't reuse `HashMap` random seeds][37470]
5563 * [The internal memory layout of `HashMap` is more cache-friendly, for
5564 significant improvements in some operations][36692]
5565 * [`HashMap` uses less memory on 32-bit architectures][36595]
5566 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5571 * [Expose rustc cfg values to build scripts][cargo/3243]
5572 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5573 * [Fix passing --features when testing multiple packages][cargo/3280]
5574 * [Use a single profile set per workspace][cargo/3249]
5575 * [Load `replace` sections from lock files][cargo/3220]
5576 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5581 * [rustup is the recommended Rust installation method][1.14rustup]
5582 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5583 S390x. These are [tier 2] platforms and may have major defects. Follow the
5584 instructions on the website to install, or add the targets to an existing
5585 installation with `rustup target add`. The new target triples are:
5586 - `mips-unknown-linux-gnu`
5587 - `mipsel-unknown-linux-gnu`
5588 - `mips64-unknown-linux-gnuabi64`
5589 - `mips64el-unknown-linux-gnuabi64 `
5590 - `powerpc-unknown-linux-gnu`
5591 - `powerpc64-unknown-linux-gnu`
5592 - `powerpc64le-unknown-linux-gnu`
5593 - `s390x-unknown-linux-gnu `
5594 * This release includes target (std) builds for ARM Linux running MUSL
5595 libc. These are [tier 2] platforms and may have major defects. Add the
5596 following triples to an existing rustup installation with `rustup target add`:
5597 - `arm-unknown-linux-musleabi`
5598 - `arm-unknown-linux-musleabihf`
5599 - `armv7-unknown-linux-musleabihf`
5600 * This release includes [experimental support for WebAssembly][1.14wasm], via
5601 the `wasm32-unknown-emscripten` target. This target is known to have major
5602 defects. Please test, report, and fix.
5603 * rustup no longer installs documentation by default. Run `rustup
5604 component add rust-docs` to install.
5605 * [Fix line stepping in debugger][37310]
5606 * [Enable line number debuginfo in releases][37280]
5611 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5612 * [Add support for Fuchsia OS][37313]
5613 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5618 * [A number of forward-compatibility lints used by the compiler
5619 to gradually introduce language changes have been converted
5620 to deny by default][36894]:
5621 - ["use of inaccessible extern crate erroneously allowed"][36886]
5622 - ["type parameter default erroneously allowed in invalid location"][36887]
5623 - ["detects super or self keywords at the beginning of global path"][36888]
5624 - ["two overlapping inherent impls define an item with the same name
5625 were erroneously allowed"][36889]
5626 - ["floating-point constants cannot be used in patterns"][36890]
5627 - ["constants of struct or enum type can only be used in a pattern if
5628 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5629 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5630 * [Prohibit patterns in trait methods without bodies][37378]
5631 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5632 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5633 * [The `$crate` macro variable is accepted in fewer locations][37213]
5634 * [Impls specifying extra region requirements beyond the trait
5635 they implement are rejected][37167]
5636 * [Enums may not be unsized][37111]. Unsized enums are intended to
5637 work but never have. For now they are forbidden.
5638 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5640 [tier 2]: https://forge.rust-lang.org/platform-support.html
5641 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5642 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5643 [36430]: https://github.com/rust-lang/rust/pull/36430
5644 [36595]: https://github.com/rust-lang/rust/pull/36595
5645 [36595]: https://github.com/rust-lang/rust/pull/36595
5646 [36692]: https://github.com/rust-lang/rust/pull/36692
5647 [36767]: https://github.com/rust-lang/rust/pull/36767
5648 [36794]: https://github.com/rust-lang/rust/pull/36794
5649 [36798]: https://github.com/rust-lang/rust/pull/36798
5650 [36819]: https://github.com/rust-lang/rust/pull/36819
5651 [36822]: https://github.com/rust-lang/rust/pull/36822
5652 [36825]: https://github.com/rust-lang/rust/pull/36825
5653 [36843]: https://github.com/rust-lang/rust/pull/36843
5654 [36880]: https://github.com/rust-lang/rust/pull/36880
5655 [36886]: https://github.com/rust-lang/rust/issues/36886
5656 [36887]: https://github.com/rust-lang/rust/issues/36887
5657 [36888]: https://github.com/rust-lang/rust/issues/36888
5658 [36889]: https://github.com/rust-lang/rust/issues/36889
5659 [36890]: https://github.com/rust-lang/rust/issues/36890
5660 [36891]: https://github.com/rust-lang/rust/issues/36891
5661 [36892]: https://github.com/rust-lang/rust/issues/36892
5662 [36894]: https://github.com/rust-lang/rust/pull/36894
5663 [36917]: https://github.com/rust-lang/rust/pull/36917
5664 [36993]: https://github.com/rust-lang/rust/pull/36993
5665 [37037]: https://github.com/rust-lang/rust/pull/37037
5666 [37064]: https://github.com/rust-lang/rust/pull/37064
5667 [37094]: https://github.com/rust-lang/rust/pull/37094
5668 [37108]: https://github.com/rust-lang/rust/pull/37108
5669 [37111]: https://github.com/rust-lang/rust/pull/37111
5670 [37161]: https://github.com/rust-lang/rust/pull/37161
5671 [37162]: https://github.com/rust-lang/rust/pull/37162
5672 [37167]: https://github.com/rust-lang/rust/pull/37167
5673 [37178]: https://github.com/rust-lang/rust/pull/37178
5674 [37200]: https://github.com/rust-lang/rust/pull/37200
5675 [37213]: https://github.com/rust-lang/rust/pull/37213
5676 [37221]: https://github.com/rust-lang/rust/pull/37221
5677 [37224]: https://github.com/rust-lang/rust/pull/37224
5678 [37230]: https://github.com/rust-lang/rust/pull/37230
5679 [37231]: https://github.com/rust-lang/rust/pull/37231
5680 [37247]: https://github.com/rust-lang/rust/pull/37247
5681 [37267]: https://github.com/rust-lang/rust/pull/37267
5682 [37270]: https://github.com/rust-lang/rust/pull/37270
5683 [37273]: https://github.com/rust-lang/rust/pull/37273
5684 [37280]: https://github.com/rust-lang/rust/pull/37280
5685 [37298]: https://github.com/rust-lang/rust/pull/37298
5686 [37306]: https://github.com/rust-lang/rust/pull/37306
5687 [37310]: https://github.com/rust-lang/rust/pull/37310
5688 [37312]: https://github.com/rust-lang/rust/pull/37312
5689 [37313]: https://github.com/rust-lang/rust/pull/37313
5690 [37315]: https://github.com/rust-lang/rust/pull/37315
5691 [37318]: https://github.com/rust-lang/rust/pull/37318
5692 [37322]: https://github.com/rust-lang/rust/pull/37322
5693 [37326]: https://github.com/rust-lang/rust/pull/37326
5694 [37351]: https://github.com/rust-lang/rust/pull/37351
5695 [37356]: https://github.com/rust-lang/rust/pull/37356
5696 [37367]: https://github.com/rust-lang/rust/pull/37367
5697 [37373]: https://github.com/rust-lang/rust/pull/37373
5698 [37378]: https://github.com/rust-lang/rust/pull/37378
5699 [37389]: https://github.com/rust-lang/rust/pull/37389
5700 [37392]: https://github.com/rust-lang/rust/pull/37392
5701 [37427]: https://github.com/rust-lang/rust/pull/37427
5702 [37439]: https://github.com/rust-lang/rust/pull/37439
5703 [37445]: https://github.com/rust-lang/rust/pull/37445
5704 [37470]: https://github.com/rust-lang/rust/pull/37470
5705 [37569]: https://github.com/rust-lang/rust/pull/37569
5706 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5707 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5708 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5709 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5710 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5711 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5712 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5715 Version 1.13.0 (2016-11-10)
5716 ===========================
5721 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5722 errors, like the `try!` macro, described in [RFC 0243].
5723 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5724 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5725 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5726 * [Fix lifetime rules for 'if' conditions][36029]
5727 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5732 * [Add the `-C link-arg` argument][36574]
5733 * [Remove the old AST-based backend from rustc_trans][35764]
5734 * [Don't enable NEON by default on armv7 Linux][35814]
5735 * [Fix debug line number info for macro expansions][35238]
5736 * [Do not emit "class method" debuginfo for types that are not
5737 DICompositeType][36008]
5738 * [Warn about multiple conflicting #[repr] hints][34623]
5739 * [When sizing DST, don't double-count nested struct prefixes][36351]
5740 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5741 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5742 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5743 * [Expand macros without recursing to avoid stack overflows][36214]
5748 * [Replace macro backtraces with labeled local uses][35702]
5749 * [Improve error message for misplaced doc comments][33922]
5750 * [Buffer unix and lock windows to prevent message interleaving][35975]
5751 * [Update lifetime errors to specifically note temporaries][36171]
5752 * [Special case a few colors for Windows][36178]
5753 * [Suggest `use self` when such an import resolves][36289]
5754 * [Be more specific when type parameter shadows primitive type][36338]
5755 * Many minor improvements
5757 Compile-time Optimizations
5758 --------------------------
5760 * [Compute and cache HIR hashes at beginning][35854]
5761 * [Don't hash types in loan paths][36004]
5762 * [Cache projections in trans][35761]
5763 * [Optimize the parser's last token handling][36527]
5764 * [Only instantiate #[inline] functions in codegen units referencing
5765 them][36524]. This leads to big improvements in cases where crates export
5766 define many inline functions without using them directly.
5767 * [Lazily allocate TypedArena's first chunk][36592]
5768 * [Don't allocate during default HashSet creation][36734]
5775 * [`overflowing_abs`]
5776 * [`RefCell::try_borrow`]
5777 * [`RefCell::try_borrow_mut`]
5782 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5783 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5785 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5786 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5787 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5788 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5789 * [Use arc4rand on FreeBSD][35884]
5790 * [memrchr: Correct aligned offset computation][35969]
5791 * [Improve Demangling of Rust Symbols][36059]
5792 * [Use monotonic time in condition variables][35048]
5793 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5794 * [Implement conversion traits for `char`][35755]
5795 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5796 * [Zero first byte of CString on drop][36264]
5797 * [Inherit overflow checks for sum and product][36372]
5798 * [Add missing Eq implementations][36423]
5799 * [Implement `Debug` for `DirEntry`][36631]
5800 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5802 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5803 * [Implement more traits for `std::io::ErrorKind`][35911]
5804 * [Optimize BinaryHeap bounds checking][36072]
5805 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5806 `extend_with_element`][36355]
5807 * [Fix overflow checking in unsigned pow()][34942]
5812 * This release includes security fixes to both curl and OpenSSL.
5813 * [Fix transitive doctests when panic=abort][cargo/3021]
5814 * [Add --all-features flag to cargo][cargo/3038]
5815 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5816 * [Don't parse the home directory more than once][cargo/3078]
5817 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5818 * [Update OpenSSL to 1.0.2j][cargo/3121]
5819 * [Add license and license_file to cargo metadata output][cargo/3110]
5820 * [Make crates-io registry URL optional in config; ignore all changes to
5821 source.crates-io][cargo/3089]
5822 * [Don't download dependencies from other platforms][cargo/3123]
5823 * [Build transitive dev-dependencies when needed][cargo/3125]
5824 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5825 * [Avoid updating registry when adding existing deps][cargo/3144]
5826 * [Warn about path overrides that won't work][cargo/3136]
5827 * [Use workspaces during `cargo install`][cargo/3146]
5828 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5829 * [Add --message-format flag][cargo/3000]
5830 * [Pass target environment for rustdoc][cargo/3205]
5831 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5832 * [Update curl and curl-sys][cargo/3241]
5833 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5838 * [rustdoc: Add the `--sysroot` argument][36586]
5839 * [rustdoc: Fix a couple of issues with the search results][35655]
5840 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5841 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5842 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5847 * [Remove unmaintained style guide][35124]
5848 * [Add s390x support][36369]
5849 * [Initial work at Haiku OS support][36727]
5850 * [Add mips-uclibc targets][35734]
5851 * [Crate-ify compiler-rt into compiler-builtins][35021]
5852 * [Add rustc version info (git hash + date) to dist tarball][36213]
5853 * Many documentation improvements
5858 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5859 * [Deny (by default) transmuting from fn item types to pointer-sized
5860 types][34923]. Continuing the long transition to zero-sized fn items,
5862 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5864 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5865 * [Fix lifetime rules for 'if' conditions][36029].
5866 * [Inherit overflow checks for sum and product][36372].
5867 * [Forbid user-defined macros named "macro_rules"][36730].
5869 [33922]: https://github.com/rust-lang/rust/pull/33922
5870 [34623]: https://github.com/rust-lang/rust/pull/34623
5871 [34923]: https://github.com/rust-lang/rust/pull/34923
5872 [34942]: https://github.com/rust-lang/rust/pull/34942
5873 [34982]: https://github.com/rust-lang/rust/pull/34982
5874 [35021]: https://github.com/rust-lang/rust/pull/35021
5875 [35048]: https://github.com/rust-lang/rust/pull/35048
5876 [35074]: https://github.com/rust-lang/rust/pull/35074
5877 [35124]: https://github.com/rust-lang/rust/pull/35124
5878 [35234]: https://github.com/rust-lang/rust/pull/35234
5879 [35238]: https://github.com/rust-lang/rust/pull/35238
5880 [35354]: https://github.com/rust-lang/rust/pull/35354
5881 [35559]: https://github.com/rust-lang/rust/pull/35559
5882 [35585]: https://github.com/rust-lang/rust/pull/35585
5883 [35627]: https://github.com/rust-lang/rust/pull/35627
5884 [35655]: https://github.com/rust-lang/rust/pull/35655
5885 [35702]: https://github.com/rust-lang/rust/pull/35702
5886 [35707]: https://github.com/rust-lang/rust/pull/35707
5887 [35728]: https://github.com/rust-lang/rust/pull/35728
5888 [35734]: https://github.com/rust-lang/rust/pull/35734
5889 [35755]: https://github.com/rust-lang/rust/pull/35755
5890 [35761]: https://github.com/rust-lang/rust/pull/35761
5891 [35764]: https://github.com/rust-lang/rust/pull/35764
5892 [35814]: https://github.com/rust-lang/rust/pull/35814
5893 [35854]: https://github.com/rust-lang/rust/pull/35854
5894 [35871]: https://github.com/rust-lang/rust/pull/35871
5895 [35884]: https://github.com/rust-lang/rust/pull/35884
5896 [35911]: https://github.com/rust-lang/rust/pull/35911
5897 [35969]: https://github.com/rust-lang/rust/pull/35969
5898 [35975]: https://github.com/rust-lang/rust/pull/35975
5899 [36004]: https://github.com/rust-lang/rust/pull/36004
5900 [36008]: https://github.com/rust-lang/rust/pull/36008
5901 [36014]: https://github.com/rust-lang/rust/pull/36014
5902 [36029]: https://github.com/rust-lang/rust/pull/36029
5903 [36059]: https://github.com/rust-lang/rust/pull/36059
5904 [36072]: https://github.com/rust-lang/rust/pull/36072
5905 [36101]: https://github.com/rust-lang/rust/pull/36101
5906 [36104]: https://github.com/rust-lang/rust/pull/36104
5907 [36171]: https://github.com/rust-lang/rust/pull/36171
5908 [36173]: https://github.com/rust-lang/rust/pull/36173
5909 [36178]: https://github.com/rust-lang/rust/pull/36178
5910 [36213]: https://github.com/rust-lang/rust/pull/36213
5911 [36214]: https://github.com/rust-lang/rust/pull/36214
5912 [36264]: https://github.com/rust-lang/rust/pull/36264
5913 [36266]: https://github.com/rust-lang/rust/pull/36266
5914 [36289]: https://github.com/rust-lang/rust/pull/36289
5915 [36338]: https://github.com/rust-lang/rust/pull/36338
5916 [36351]: https://github.com/rust-lang/rust/pull/36351
5917 [36355]: https://github.com/rust-lang/rust/pull/36355
5918 [36369]: https://github.com/rust-lang/rust/pull/36369
5919 [36372]: https://github.com/rust-lang/rust/pull/36372
5920 [36423]: https://github.com/rust-lang/rust/pull/36423
5921 [36482]: https://github.com/rust-lang/rust/pull/36482
5922 [36505]: https://github.com/rust-lang/rust/pull/36505
5923 [36524]: https://github.com/rust-lang/rust/pull/36524
5924 [36527]: https://github.com/rust-lang/rust/pull/36527
5925 [36551]: https://github.com/rust-lang/rust/pull/36551
5926 [36574]: https://github.com/rust-lang/rust/pull/36574
5927 [36586]: https://github.com/rust-lang/rust/pull/36586
5928 [36592]: https://github.com/rust-lang/rust/pull/36592
5929 [36631]: https://github.com/rust-lang/rust/pull/36631
5930 [36639]: https://github.com/rust-lang/rust/pull/36639
5931 [36721]: https://github.com/rust-lang/rust/pull/36721
5932 [36727]: https://github.com/rust-lang/rust/pull/36727
5933 [36730]: https://github.com/rust-lang/rust/pull/36730
5934 [36734]: https://github.com/rust-lang/rust/pull/36734
5935 [36754]: https://github.com/rust-lang/rust/pull/36754
5936 [36995]: https://github.com/rust-lang/rust/pull/36995
5937 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5938 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5939 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5940 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5941 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5942 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5943 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5944 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5945 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5946 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5947 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5948 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5949 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5950 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5951 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5952 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5953 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5954 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5955 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5956 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5957 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5958 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5959 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5960 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5961 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5962 [rustup]: https://www.rustup.rs
5963 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5964 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5965 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5966 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5967 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5968 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5969 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5972 Version 1.12.1 (2016-10-20)
5973 ===========================
5978 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5979 * [Confusion with double negation and booleans][36856]
5980 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5981 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5982 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5983 * [Corrupted memory after updated to 1.12][36936]
5984 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5985 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5986 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5988 [36381]: https://github.com/rust-lang/rust/issues/36381
5989 [36856]: https://github.com/rust-lang/rust/issues/36856
5990 [36875]: https://github.com/rust-lang/rust/issues/36875
5991 [36924]: https://github.com/rust-lang/rust/issues/36924
5992 [36926]: https://github.com/rust-lang/rust/issues/36926
5993 [36936]: https://github.com/rust-lang/rust/issues/36936
5994 [37026]: https://github.com/rust-lang/rust/issues/37026
5995 [37112]: https://github.com/rust-lang/rust/issues/37112
5996 [37153]: https://github.com/rust-lang/rust/issues/37153
5999 Version 1.12.0 (2016-09-29)
6000 ===========================
6005 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6006 This translation pass is far simpler than the previous AST->LLVM pass, and
6007 creates opportunities to perform new optimizations directly on the MIR. It
6008 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6009 * [`rustc` presents a new, more readable error format, along with
6010 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6011 Most common editors supporting Rust have been updated to work with it. It was
6012 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6017 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
6018 This translation pass is far simpler than the previous AST->LLVM pass, and
6019 creates opportunities to perform new optimizations directly on the MIR. It
6020 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
6021 * [Print the Rust target name, not the LLVM target name, with
6022 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
6023 * [The computation of `TypeId` is correct in some cases where it was previously
6024 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
6025 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
6026 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
6027 `--print relocation-models`, and `--print code-models` print the available
6028 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
6029 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
6030 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
6031 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
6032 These targets produce statically-linked binaries. There are no binary release
6038 * [`rustc` presents a new, more readable error format, along with
6039 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
6040 Most common editors supporting Rust have been updated to work with it. It was
6041 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
6042 * [In error descriptions, references are now described in plain English,
6043 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
6044 * [In error type descriptions, unknown numeric types are named `{integer}` or
6045 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
6046 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
6051 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
6052 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
6053 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
6054 useful](https://github.com/rust-lang/rust/pull/34908)
6055 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
6056 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
6057 * [Semicolons are properly required as statement delimiters inside
6058 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
6059 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
6064 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
6065 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
6066 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
6067 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
6068 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
6069 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
6070 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
6071 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
6072 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
6073 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
6074 Both on Unix and Windows.
6075 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
6076 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
6077 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
6078 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
6079 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
6080 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
6081 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
6082 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
6087 * [The `format!` macro and friends now allow a single argument to be formatted
6088 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
6089 * [The lifetime bounds on `[T]::binary_search_by` and
6090 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
6091 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
6092 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
6093 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
6094 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
6095 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
6096 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
6097 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
6098 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
6099 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
6100 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
6101 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6102 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
6103 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
6104 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
6105 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
6106 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
6107 * [`mpsc::sync_channel` `Receiver`s return any available message before
6108 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
6109 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
6110 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
6115 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
6116 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
6117 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
6118 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
6119 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
6120 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
6121 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
6122 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
6123 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
6124 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
6125 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
6126 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
6127 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
6128 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
6129 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
6130 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
6135 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
6136 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
6141 * [Test binaries now support a `--test-threads` argument to specify the number
6142 of threads used to run tests, and which acts the same as the
6143 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
6144 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
6145 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
6146 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6147 * [Rust releases now come with source packages that can be installed by rustup
6148 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
6149 The resulting source code can be used by tools and IDES, located in the
6150 sysroot under `lib/rustlib/src`.
6155 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
6156 * Many minor improvements to the documentation.
6157 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
6162 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
6163 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
6164 * [When formatting strings, if "precision" is specified, the "fill",
6165 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
6166 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
6169 Version 1.11.0 (2016-08-18)
6170 ===========================
6175 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
6176 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
6177 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
6178 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
6183 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
6184 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
6185 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
6186 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
6187 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
6188 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
6189 (in libcore - previously stabilized in libstd)
6190 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
6191 (in libcore - previously stabilized in libstd)
6192 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
6193 (in libcore - previously stabilized in libstd)
6194 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
6195 (in libcore - previously stabilized in libstd)
6196 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6197 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
6198 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
6199 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
6204 * [The `thread_local!` macro supports multiple definitions in a single
6205 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
6206 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
6207 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
6208 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
6209 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
6210 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
6211 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
6212 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
6217 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
6218 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
6219 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
6220 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
6221 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
6222 and `-vv` prints warnings for all crates.
6223 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
6224 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
6225 This provides room for expansion by arbitrary tools.
6226 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
6227 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
6228 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
6229 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
6230 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
6231 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
6232 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
6237 * [Caching projections speeds up type check dramatically for some
6238 workloads](https://github.com/rust-lang/rust/pull/33816)
6239 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
6240 This hasher is faster, but is believed to provide sufficient
6241 protection from collision attacks.
6242 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
6247 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
6248 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
6249 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
6250 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
6251 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
6256 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
6257 * [When emitting debug info, rustc emits frame pointers for closures,
6258 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
6259 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
6260 * Many more errors have been given error codes and extended
6262 * API documentation continues to be improved, with many new examples
6267 * [rustc no longer hangs when dependencies recursively re-export
6268 submodules](https://github.com/rust-lang/rust/pull/34542)
6269 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
6270 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
6271 rewritten](https://github.com/rust-lang/rust/pull/33895)
6272 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
6273 No targets use this yet, but it works toward AVR support.
6278 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
6279 * [The new follow-set rules that place restrictions on `macro_rules!`
6280 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
6281 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
6282 and has been a warning since 1.10.
6283 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
6284 This causes breakage in some corner cases.
6287 Version 1.10.0 (2016-07-07)
6288 ===========================
6293 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
6294 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
6295 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
6296 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
6297 * [`panic!` can be converted to a runtime abort with the
6298 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
6299 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6300 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
6301 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
6302 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
6303 Note that Cargo does not yet directly support cdylibs.
6308 * `os::windows::fs::OpenOptionsExt::access_mode`
6309 * `os::windows::fs::OpenOptionsExt::share_mode`
6310 * `os::windows::fs::OpenOptionsExt::custom_flags`
6311 * `os::windows::fs::OpenOptionsExt::attributes`
6312 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
6313 * `os::unix::fs::OpenOptionsExt::custom_flags`
6314 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
6315 * `Default for sync::Weak`
6316 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
6317 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
6318 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
6319 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
6320 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
6321 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
6322 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
6323 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
6324 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
6325 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
6326 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
6327 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
6328 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
6329 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
6330 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
6331 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
6332 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
6333 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
6334 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
6335 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
6336 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
6337 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
6338 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
6339 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
6340 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
6341 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6342 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6343 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
6344 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
6345 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
6346 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
6347 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
6348 * Read/Write/RawFd impls for `UnixStream`
6349 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
6350 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
6351 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
6352 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
6353 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
6354 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
6355 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
6356 * RawFd impls for `UnixListener`
6357 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
6358 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
6359 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
6360 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
6361 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
6362 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
6363 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
6364 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
6365 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
6366 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
6367 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
6368 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
6369 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
6370 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
6371 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
6372 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
6373 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
6374 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
6375 * RawFd impls for `UnixDatagram`
6376 * `{BTree,Hash}Map::values_mut`
6377 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
6382 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
6383 The semantics of this minor method are subtle and probably not what
6385 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
6386 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6387 will fall back to `/dev/urandom` temporarily to avoid blocking
6388 during early boot](https://github.com/rust-lang/rust/pull/33086).
6389 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
6390 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
6391 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
6392 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
6393 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
6394 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
6395 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
6399 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
6400 This controls the runtime behavior of the `panic!` macro
6401 and can be either "unwind" (the default), or "abort".
6402 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
6403 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
6404 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
6405 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
6406 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
6407 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
6408 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
6409 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
6410 By default they are retried twice, which can be customized with the
6411 `net.retry` value in `.cargo/config`.
6412 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
6413 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
6414 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
6415 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
6416 Makes it possible to install multiple crates in parallel.
6417 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6418 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6419 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6420 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6421 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6422 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6427 * [rustc memory usage was reduced by refactoring the context used for
6428 type checking](https://github.com/rust-lang/rust/pull/33425).
6429 * [Speed up creation of `HashMap`s by caching the random keys used
6430 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6431 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6432 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6433 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6434 10x faster than the previous lookup tables.
6435 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6440 * Many incremental improvements to documentation and rustdoc.
6441 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6442 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6443 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6444 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6445 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6446 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6447 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6452 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6453 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6454 * [`std` no longer prints backtraces on platforms where the running
6455 module must be loaded with `env::current_exe`, which can't be relied
6456 on](https://github.com/rust-lang/rust/pull/33554).
6457 * This release includes std binaries for the i586-unknown-linux-gnu,
6458 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6459 i586 target is for old x86 hardware without SSE2, and the armv7
6460 target is for Android running on modern ARM architectures.
6461 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6462 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6463 * [On Unix the runtime aborts by calling `libc::abort` instead of
6464 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6465 * [Rust is now bootstrapped from the previous release of Rust,
6466 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6471 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6472 * [`target_env` for Linux ARM targets is just `gnu`, not
6473 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6474 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6475 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6476 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6477 Affects how macros are parsed.
6478 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6479 * [Feature-gated attributes on macro-generated macro invocations are
6480 now rejected](https://github.com/rust-lang/rust/pull/32791).
6481 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6482 This caused some minor changes to type inference.
6485 Version 1.9.0 (2016-05-26)
6486 ==========================
6491 * The `#[deprecated]` attribute when applied to an API will generate
6492 warnings when used. The warnings may be suppressed with
6493 `#[allow(deprecated)]`. [RFC 1270].
6494 * [`fn` item types are zero sized, and each `fn` names a unique
6495 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6496 `transmute` on a `fn` type will generate a warning for a few cycles,
6497 then will be converted to an error.
6498 * [Field and method resolution understand visibility, so private
6499 fields and methods cannot prevent the proper use of public fields
6500 and methods][1.9fv].
6501 * [The parser considers unicode codepoints in the
6502 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6508 * [`std::panic::catch_unwind`] (renamed from `recover`)
6509 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6510 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6511 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6512 * [`str::is_char_boundary`]
6513 * [`<*const T>::as_ref`]
6514 * [`<*mut T>::as_ref`]
6515 * [`<*mut T>::as_mut`]
6516 * [`AsciiExt::make_ascii_uppercase`]
6517 * [`AsciiExt::make_ascii_lowercase`]
6518 * [`char::decode_utf16`]
6519 * [`char::DecodeUtf16`]
6520 * [`char::DecodeUtf16Error`]
6521 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6522 * [`BTreeSet::take`]
6523 * [`BTreeSet::replace`]
6526 * [`HashSet::replace`]
6528 * [`OsString::with_capacity`]
6529 * [`OsString::clear`]
6530 * [`OsString::capacity`]
6531 * [`OsString::reserve`]
6532 * [`OsString::reserve_exact`]
6533 * [`OsStr::is_empty`]
6535 * [`std::os::unix::thread`]
6538 * [`JoinHandleExt::as_pthread_t`]
6539 * [`JoinHandleExt::into_pthread_t`]
6540 * [`HashSet::hasher`]
6541 * [`HashMap::hasher`]
6542 * [`CommandExt::exec`]
6543 * [`File::try_clone`]
6544 * [`SocketAddr::set_ip`]
6545 * [`SocketAddr::set_port`]
6546 * [`SocketAddrV4::set_ip`]
6547 * [`SocketAddrV4::set_port`]
6548 * [`SocketAddrV6::set_ip`]
6549 * [`SocketAddrV6::set_port`]
6550 * [`SocketAddrV6::set_flowinfo`]
6551 * [`SocketAddrV6::set_scope_id`]
6552 * [`slice::copy_from_slice`]
6553 * [`ptr::read_volatile`]
6554 * [`ptr::write_volatile`]
6555 * [`OpenOptions::create_new`]
6556 * [`TcpStream::set_nodelay`]
6557 * [`TcpStream::nodelay`]
6558 * [`TcpStream::set_ttl`]
6559 * [`TcpStream::ttl`]
6560 * [`TcpStream::set_only_v6`]
6561 * [`TcpStream::only_v6`]
6562 * [`TcpStream::take_error`]
6563 * [`TcpStream::set_nonblocking`]
6564 * [`TcpListener::set_ttl`]
6565 * [`TcpListener::ttl`]
6566 * [`TcpListener::set_only_v6`]
6567 * [`TcpListener::only_v6`]
6568 * [`TcpListener::take_error`]
6569 * [`TcpListener::set_nonblocking`]
6570 * [`UdpSocket::set_broadcast`]
6571 * [`UdpSocket::broadcast`]
6572 * [`UdpSocket::set_multicast_loop_v4`]
6573 * [`UdpSocket::multicast_loop_v4`]
6574 * [`UdpSocket::set_multicast_ttl_v4`]
6575 * [`UdpSocket::multicast_ttl_v4`]
6576 * [`UdpSocket::set_multicast_loop_v6`]
6577 * [`UdpSocket::multicast_loop_v6`]
6578 * [`UdpSocket::set_multicast_ttl_v6`]
6579 * [`UdpSocket::multicast_ttl_v6`]
6580 * [`UdpSocket::set_ttl`]
6581 * [`UdpSocket::ttl`]
6582 * [`UdpSocket::set_only_v6`]
6583 * [`UdpSocket::only_v6`]
6584 * [`UdpSocket::join_multicast_v4`]
6585 * [`UdpSocket::join_multicast_v6`]
6586 * [`UdpSocket::leave_multicast_v4`]
6587 * [`UdpSocket::leave_multicast_v6`]
6588 * [`UdpSocket::take_error`]
6589 * [`UdpSocket::connect`]
6590 * [`UdpSocket::send`]
6591 * [`UdpSocket::recv`]
6592 * [`UdpSocket::set_nonblocking`]
6597 * [`std::sync::Once` is poisoned if its initialization function
6599 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6600 * [Most types implement `fmt::Debug`][1.9db].
6601 * [The default buffer size used by `BufReader` and `BufWriter` was
6602 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6603 used by other languages.
6604 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6605 `Duration` additionally implements `*=` and `/=`][1.9ta].
6606 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6607 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6608 * [`Chain` implements `BufRead`][1.9ch].
6609 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6614 * [Cargo can now run concurrently][1.9cc].
6615 * [Top-level overrides allow specific revisions of crates to be
6616 overridden through the entire crate graph][1.9ct]. This is intended
6617 to make upgrades easier for large projects, by allowing crates to be
6618 forked temporarily until they've been upgraded and republished.
6619 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6620 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6621 on the commandline][1.9cf]. `rustc` arguments can also be specified
6622 in the `build.rustflags` configuration key.
6627 * [The time complexity of comparing variables for equivalence during type
6628 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6629 to major compilation time improvement in some scenarios.
6630 * [`ToString` is specialized for `str`, giving it the same performance
6631 as `to_owned`][1.9ts].
6632 * [Spawning processes with `Command::output` no longer creates extra
6634 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6635 for C-like enums][1.9cl].
6640 * [Passing the `--quiet` flag to a test runner will produce
6641 much-abbreviated output][1.9q].
6642 * The Rust Project now publishes std binaries for the
6643 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6644 `i586-pc-windows-msvc` targets.
6649 * [`std::sync::Once` is poisoned if its initialization function
6651 * [It is illegal to define methods with the same name in overlapping
6652 inherent `impl` blocks][1.9sn].
6653 * [`fn` item types are zero sized, and each `fn` names a unique
6654 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6655 `transmute` on a `fn` type will generate a warning for a few cycles,
6656 then will be converted to an error.
6657 * [Improvements to const evaluation may trigger new errors when integer
6658 literals are out of range][1.9ce].
6661 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6662 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6663 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6664 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6665 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6666 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6667 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6668 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6669 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6670 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6671 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6672 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6673 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6674 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6675 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6676 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6677 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6678 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6679 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6680 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6681 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6682 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6683 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6684 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6685 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6686 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6687 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6688 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6689 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6690 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6691 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6692 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6693 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6694 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6695 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6696 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6697 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6698 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6699 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6700 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6701 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6702 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6703 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6704 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6705 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6706 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6707 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6708 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6709 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6710 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6711 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6712 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6713 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6714 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6715 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6716 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6717 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6718 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6719 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6720 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6721 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6722 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6723 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6724 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6725 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6726 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6727 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6728 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6729 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6730 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6731 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6732 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6733 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6734 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6735 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6736 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6737 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6738 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6739 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6740 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6741 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6742 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6743 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6744 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6745 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6746 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6747 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6748 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6749 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6750 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6751 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6752 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6753 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6754 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6755 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6756 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6757 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6758 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6759 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6760 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6761 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6762 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6763 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6764 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6765 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6766 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6767 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6768 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6769 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6770 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6773 Version 1.8.0 (2016-04-14)
6774 ==========================
6779 * Rust supports overloading of compound assignment statements like
6780 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6781 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6782 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6784 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6785 addition to the non-braced form, `struct Foo;`. [RFC 218].
6791 * [`str::encode_utf16`] (renamed from `utf16_units`)
6792 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6795 * [`ptr::drop_in_place`]
6797 * [`time::SystemTime`]
6799 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6800 * [`Instant::elapsed`]
6801 * [`SystemTime::now`]
6802 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6803 * [`SystemTime::elapsed`]
6804 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6805 * [`SystemTimeError`]
6806 * [`SystemTimeError::duration`]
6807 * Various impls for `SystemTimeError`
6809 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6810 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6811 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6812 * [The `write!` and `writeln!` macros correctly emit errors if any of
6813 their arguments can't be formatted][1.8w].
6814 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6815 * [The Unix-specific `raw` modules, which contain a number of
6816 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6817 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6818 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6819 across platforms was making it difficult to implement `std`
6820 correctly. Those that need these definitions should use the `libc`
6822 * The Unix-specific `MetadataExt` traits, including
6823 `os::unix::fs::MetadataExt`, which expose values such as inode
6824 numbers [no longer return platform-specific types][1.8r], but
6825 instead return widened integers. [RFC 1415].
6826 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6827 * [Atomic loads and stores are not volatile][1.8a].
6828 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6833 * [Inlining hash functions lead to a 3% compile-time improvement in
6834 some workloads][1.8h].
6835 * When using jemalloc, its symbols are [unprefixed so that it
6836 overrides the libc malloc implementation][1.8h]. This means that for
6837 rustc, LLVM is now using jemalloc, which results in a 6%
6838 compile-time improvement on a specific workload.
6839 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6844 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6845 i686-pc-windows-msvc is now considered a tier-1 platform.
6846 * [The `--print targets` flag prints a list of supported targets][1.8t].
6847 * [The `--print cfg` flag prints the `cfg`s defined for the current
6849 * [`rustc` can be built with an new Cargo-based build system, written
6850 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6851 build system. To enable it configure with `configure --rustbuild`.
6852 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6853 variants while also indicating the total number of missing variants
6854 if more than 3][1.8m].
6855 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6856 * The Rust Project now publishes binary releases of the standard
6857 library for a number of tier-2 targets:
6858 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6859 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6860 `x86_64-rumprun-netbsd`. These can be installed with
6861 tools such as [multirust][1.8mr].
6866 * [`cargo init` creates a new Cargo project in the current
6867 directory][1.8ci]. It is otherwise like `cargo new`.
6868 * [Cargo has configuration keys for `-v` and
6869 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6870 `[term]` section of `.cargo/config`.
6871 * [Configuration keys that evaluate to strings or integers can be set
6872 via environment variables][1.8ce]. For example the `build.jobs` key
6873 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6874 precedence over config files.
6875 * [Target-specific dependencies support Rust `cfg` syntax for
6876 describing targets][1.8cfg] so that dependencies for multiple
6877 targets can be specified together. [RFC 1361].
6878 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6879 `RUSTDOC` take precedence over the `build.target-dir`,
6880 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6881 * [The child process tree is killed on Windows when Cargo is
6883 * [The `build.target` configuration value sets the target platform,
6884 like `--target`][1.8ct].
6889 * [Unstable compiler flags have been further restricted][1.8u]. Since
6890 1.0 `-Z` flags have been considered unstable, and other flags that
6891 were considered unstable additionally required passing `-Z
6892 unstable-options` to access. Unlike unstable language and library
6893 features though, these options have been accessible on the stable
6894 release channel. Going forward, *new unstable flags will not be
6895 available on the stable release channel*, and old unstable flags
6896 will warn about their usage. In the future, all unstable flags will
6897 be unavailable on the stable release channel.
6898 * [It is no longer possible to `match` on empty enum variants using
6899 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6900 * The Unix-specific `MetadataExt` traits, including
6901 `os::unix::fs::MetadataExt`, which expose values such as inode
6902 numbers [no longer return platform-specific types][1.8r], but
6903 instead return widened integers. [RFC 1415].
6904 * [Modules sourced from the filesystem cannot appear within arbitrary
6905 blocks, but only within other modules][1.8mf].
6906 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6907 * On Unix, [stack overflow triggers a runtime abort instead of a
6909 * [`Command::spawn` and its equivalents return an error if any of
6910 its command-line arguments contain interior `NUL`s][1.8n].
6911 * [Tuple and unit enum variants from other crates are in the type
6913 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6914 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6915 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6916 instead of `foo.lib`.
6919 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6920 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6921 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6922 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6923 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6924 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6925 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6926 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6927 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6928 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6929 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6930 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6931 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6932 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6933 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6934 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6935 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6936 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6937 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6938 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6939 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6940 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6941 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6942 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6943 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6944 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6945 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6946 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6947 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6948 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6949 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6950 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6951 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6952 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6953 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6954 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6955 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6956 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6957 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6958 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6959 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6960 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6961 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6962 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6963 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6964 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6965 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6966 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6967 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6968 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6969 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6970 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6971 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6972 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6973 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6974 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6975 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6976 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6977 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6978 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6981 Version 1.7.0 (2016-03-03)
6982 ==========================
6989 * [`Path::strip_prefix`] (renamed from relative_from)
6990 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6992 * [`Ipv4Addr::is_loopback`]
6993 * [`Ipv4Addr::is_private`]
6994 * [`Ipv4Addr::is_link_local`]
6995 * [`Ipv4Addr::is_multicast`]
6996 * [`Ipv4Addr::is_broadcast`]
6997 * [`Ipv4Addr::is_documentation`]
6999 * [`Ipv6Addr::is_unspecified`]
7000 * [`Ipv6Addr::is_loopback`]
7001 * [`Ipv6Addr::is_multicast`]
7004 * [`Vec::as_mut_slice`]
7006 * [`String::as_str`]
7007 * [`String::as_mut_str`]
7009 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7011 * `<[T]>::`[`sort_by_key`]
7012 * checked, saturated, and overflowing operations
7013 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
7014 * [`i32::saturating_mul`]
7015 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
7016 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
7017 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
7018 * [`u32::saturating_mul`]
7019 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
7020 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
7021 * and checked, saturated, and overflowing operations for other primitive types
7023 * [`ffi::IntoStringError`]
7024 * [`CString::into_string`]
7025 * [`CString::into_bytes`]
7026 * [`CString::into_bytes_with_nul`]
7027 * `From<CString> for Vec<u8>`
7029 * [`IntoStringError::into_cstring`]
7030 * [`IntoStringError::utf8_error`]
7031 * `Error for IntoStringError`
7033 * [`std::hash::BuildHasher`]
7034 * [`BuildHasher::Hasher`]
7035 * [`BuildHasher::build_hasher`]
7036 * [`std::hash::BuildHasherDefault`]
7037 * [`HashMap::with_hasher`]
7038 * [`HashMap::with_capacity_and_hasher`]
7039 * [`HashSet::with_hasher`]
7040 * [`HashSet::with_capacity_and_hasher`]
7041 * [`std::collections::hash_map::RandomState`]
7042 * [`RandomState::new`]
7043 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
7044 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
7045 from bytes is faster.
7046 * [The performance of `LineWriter` (and thus `io::stdout`) was
7047 improved by using `memchr` to search for newlines][1.7m].
7048 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
7049 `f64` variants were stabilized previously.
7050 * [`BTreeMap` was rewritten to use less memory and improve the performance
7051 of insertion and iteration, the latter by as much as 5x][1.7bm].
7052 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
7053 covariant over their contained type][1.7bt].
7054 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
7055 over their contained type][1.7ll].
7056 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
7058 * [`Any` is implemented for unsized types][1.7a].
7059 * [`Hash` is implemented for `Duration`][1.7h].
7064 * [When running tests with `--test`, rustdoc will pass `--cfg`
7065 arguments to the compiler][1.7dt].
7066 * [The compiler is built with RPATH information by default][1.7rpa].
7067 This means that it will be possible to run `rustc` when installed in
7068 unusual configurations without configuring the dynamic linker search
7070 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
7071 any RPATH entries (emitted with `-C rpath`) *not* take precedence
7072 over `LD_LIBRARY_PATH`.
7077 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
7078 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
7079 * [The `rerun-if-changed` build script directive no longer causes the
7080 build script to incorrectly run twice in certain scenarios][1.7rr].
7085 * Soundness fixes to the interactions between associated types and
7086 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
7087 code that violates the new rules. This is a significant change that
7088 is known to break existing code, so it has emitted warnings for the
7089 new error cases since 1.4 to give crate authors time to adapt. The
7090 details of what is changing are subtle; read the RFC for more.
7091 * [Several bugs in the compiler's visibility calculations were
7092 fixed][1.7v]. Since this was found to break significant amounts of
7093 code, the new errors will be emitted as warnings for several release
7094 cycles, under the `private_in_public` lint.
7095 * Defaulted type parameters were accidentally accepted in positions
7096 that were not intended. In this release, [defaulted type parameters
7097 appearing outside of type definitions will generate a
7098 warning][1.7d], which will become an error in future releases.
7099 * [Parsing "." as a float results in an error instead of 0][1.7p].
7100 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
7101 * [Borrows of closure parameters may not outlive the closure][1.7bc].
7103 [1.7a]: https://github.com/rust-lang/rust/pull/30928
7104 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
7105 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
7106 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
7107 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
7108 [1.7d]: https://github.com/rust-lang/rust/pull/30724
7109 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
7110 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
7111 [1.7f]: https://github.com/rust-lang/rust/pull/30672
7112 [1.7h]: https://github.com/rust-lang/rust/pull/30818
7113 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
7114 [1.7m]: https://github.com/rust-lang/rust/pull/30381
7115 [1.7p]: https://github.com/rust-lang/rust/pull/30681
7116 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
7117 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
7118 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
7119 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
7120 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
7121 [1.7v]: https://github.com/rust-lang/rust/pull/29973
7122 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7123 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7124 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
7125 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
7126 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
7127 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
7128 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
7129 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
7130 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
7131 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
7132 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
7133 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
7134 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
7135 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
7136 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
7137 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
7138 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
7139 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
7140 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
7141 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
7142 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
7143 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
7144 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
7145 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
7146 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
7147 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
7148 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
7149 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
7150 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
7151 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
7152 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
7153 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
7154 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
7155 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
7156 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
7157 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
7158 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
7159 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
7160 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
7161 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
7162 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
7163 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
7164 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
7165 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
7166 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
7167 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
7168 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
7169 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7170 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
7171 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
7172 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
7173 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
7174 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
7175 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
7176 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
7177 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
7178 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
7179 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
7180 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
7181 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
7184 Version 1.6.0 (2016-01-21)
7185 ==========================
7190 * The `#![no_std]` attribute causes a crate to not be linked to the
7191 standard library, but only the [core library][1.6co], as described
7192 in [RFC 1184]. The core library defines common types and traits but
7193 has no platform dependencies whatsoever, and is the basis for Rust
7194 software in environments that cannot support a full port of the
7195 standard library, such as operating systems. Most of the core
7196 library is now stable.
7202 [`Read::read_exact`],
7203 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
7204 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
7205 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
7206 [`os::unix::fs::DirBuilderExt`],
7207 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
7208 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
7209 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
7210 [`collections::hash_map::Drain`],
7211 [`collections::hash_map::HashMap::drain`],
7212 [`collections::hash_set::Drain`],
7213 [`collections::hash_set::HashSet::drain`],
7214 [`collections::binary_heap::Drain`],
7215 [`collections::binary_heap::BinaryHeap::drain`],
7216 [`Vec::extend_from_slice`] (renamed from `push_all`),
7217 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
7218 [`RwLock::into_inner`],
7219 [`Iterator::min_by_key`] (renamed from `min_by`),
7220 [`Iterator::max_by_key`] (renamed from `max_by`).
7221 * The [core library][1.6co] is stable, as are most of its APIs.
7222 * [The `assert_eq!` macro supports arguments that don't implement
7223 `Sized`][1.6ae], such as arrays. In this way it behaves more like
7225 * Several timer functions that take duration in milliseconds [are
7226 deprecated in favor of those that take `Duration`][1.6ms]. These
7227 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
7228 `thread::park_timeout_ms`.
7229 * The algorithm by which `Vec` reserves additional elements was
7230 [tweaked to not allocate excessive space][1.6a] while still growing
7232 * `From` conversions are [implemented from integers to floats][1.6f]
7233 in cases where the conversion is lossless. Thus they are not
7234 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
7235 or `f64`. They are also not implemented for `isize` and `usize`
7236 because the implementations would be platform-specific. `From` is
7237 also implemented from `f32` to `f64`.
7238 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
7239 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
7240 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
7241 * [`BinaryHeap` was refactored][1.6bh] for modest performance
7243 * Sorting slices that are already sorted [is 50% faster in some
7249 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
7250 * Cargo build scripts can specify their dependencies by emitting the
7251 [`rerun-if-changed`][1.6rr] key.
7252 * crates.io will reject publication of crates with dependencies that
7253 have a wildcard version constraint. Crates with wildcard
7254 dependencies were seen to cause a variety of problems, as described
7255 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7257 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
7258 release folder. A variety of artifacts that Cargo failed to clean
7259 are now correctly deleted.
7264 * The `unreachable_code` lint [warns when a function call's argument
7266 * The parser indicates [failures that may be caused by
7267 confusingly-similar Unicode characters][1.6uc]
7268 * Certain macro errors [are reported at definition time][1.6m], not
7274 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
7275 environment variable when locating crates. This was a pre-cargo
7276 feature for integrating with the package manager that was
7277 accidentally never removed.
7278 * [A number of bugs were fixed in the privacy checker][1.6p] that
7279 could cause previously-accepted code to break.
7280 * [Modules and unit/tuple structs may not share the same name][1.6ts].
7281 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
7282 struct pattern syntax (`Foo(..)`) can no longer be used to match
7283 unit structs. This is a warning now, but will become an error in
7284 future releases. Patterns that share the same name as a const are
7286 * A bug was fixed that causes [rustc not to apply default type
7287 parameters][1.6xc] when resolving certain method implementations of
7288 traits defined in other crates.
7290 [1.6a]: https://github.com/rust-lang/rust/pull/29454
7291 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
7292 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
7293 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
7294 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
7295 [1.6co]: http://doc.rust-lang.org/core/index.html
7296 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
7297 [1.6f]: https://github.com/rust-lang/rust/pull/29129
7298 [1.6m]: https://github.com/rust-lang/rust/pull/29828
7299 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
7300 [1.6p]: https://github.com/rust-lang/rust/pull/29726
7301 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
7302 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
7303 [1.6s]: https://github.com/rust-lang/rust/pull/29675
7304 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
7305 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
7306 [1.6us]: https://github.com/rust-lang/rust/pull/29383
7307 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
7308 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
7309 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7310 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
7311 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
7312 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
7313 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
7314 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
7315 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
7316 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
7317 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
7318 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
7319 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
7320 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
7321 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
7322 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
7323 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
7324 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
7325 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
7326 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
7327 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
7328 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
7329 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
7330 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
7331 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
7332 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
7333 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
7334 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
7335 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
7336 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
7339 Version 1.5.0 (2015-12-10)
7340 ==========================
7342 * ~700 changes, numerous bugfixes
7348 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
7349 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
7350 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
7351 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
7352 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
7353 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
7354 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
7355 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
7356 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
7357 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
7358 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
7359 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
7360 [`Path::read_link`], [`Path::symlink_metadata`],
7361 [`Utf8Error::valid_up_to`], [`Vec::resize`],
7362 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
7363 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
7364 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
7365 [`slice::split_first_mut`], [`slice::split_first`],
7366 [`slice::split_last_mut`], [`slice::split_last`],
7367 [`char::from_u32_unchecked`], [`fs::canonicalize`],
7368 [`str::MatchIndices`], [`str::RMatchIndices`],
7369 [`str::match_indices`], [`str::rmatch_indices`],
7370 [`str::slice_mut_unchecked`], [`string::ParseError`].
7371 * Rust applications hosted on crates.io can be installed locally to
7372 `~/.cargo/bin` with the [`cargo install`] command. Among other
7373 things this makes it easier to augment Cargo with new subcommands:
7374 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
7375 invoked as `cargo foo`.
7376 * Crates with wildcard (`*`) dependencies will [emit warnings when
7377 published][1.5w]. In 1.6 it will no longer be possible to publish
7378 crates with wildcard dependencies.
7383 * The rules determining when a particular lifetime must outlive
7384 a particular value (known as '[dropck]') have been [modified
7385 to not rely on parametricity][1.5p].
7386 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
7387 and `Arc`][1.5a]. Because these smart pointer types implement
7388 `Deref`, this causes breakage in cases where the interior type
7389 contains methods of the same name.
7390 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
7391 that they could drop their content. Soundness fix.
7392 * All method invocations are [properly checked][1.5wf1] for
7393 [well-formedness][1.5wf2]. Soundness fix.
7394 * Traits whose supertraits contain `Self` are [not object
7395 safe][1.5o]. Soundness fix.
7396 * Target specifications support a [`no_default_libraries`][1.5nd]
7397 setting that controls whether `-nodefaultlibs` is passed to the
7398 linker, and in turn the `is_like_windows` setting no longer affects
7399 the `-nodefaultlibs` flag.
7400 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
7401 * The `#[inline]` and `#[repr]` attributes [can only appear
7402 in valid locations][1.5at].
7403 * Native libraries linked from the local crate are [passed to
7404 the linker before native libraries from upstream crates][1.5nl].
7405 * Two rarely-used attributes, `#[no_debug]` and
7406 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
7407 * Negation of unsigned integers, which has been a warning for
7408 several releases, [is now behind a feature gate and will
7409 generate errors][1.5nu].
7410 * The parser accidentally accepted visibility modifiers on
7411 enum variants, a bug [which has been fixed][1.5ev].
7412 * [A bug was fixed that allowed `use` statements to import unstable
7418 * When evaluating expressions at compile-time that are not
7419 compile-time constants (const-evaluating expressions in non-const
7420 contexts), incorrect code such as overlong bitshifts and arithmetic
7421 overflow will [generate a warning instead of an error][1.5ce],
7422 delaying the error until runtime. This will allow the
7423 const-evaluator to be expanded in the future backwards-compatibly.
7424 * The `improper_ctypes` lint [no longer warns about using `isize` and
7425 `usize` in FFI][1.5ict].
7430 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7432 * `Default` is [implemented for mutable slices][1.5d].
7433 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7434 * There are now `From` conversions [between floating point
7435 types][1.5f] where the conversions are lossless.
7436 * There are now `From` conversions [between integer types][1.5i] where
7437 the conversions are lossless.
7438 * [`fs::Metadata` implements `Clone`][1.5fs].
7439 * The `parse` method [accepts a leading "+" when parsing
7441 * [`AsMut` is implemented for `Vec`][1.5am].
7442 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7443 been optimized][1.5cf] and no longer rely on the default impl.
7444 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7445 `unsafe extern "C"` function types now [implement `Clone`,
7446 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7447 `fmt::Debug` for up to 12 arguments][1.5fp].
7448 * [Dropping `Vec`s is much faster in unoptimized builds when the
7449 element types don't implement `Drop`][1.5dv].
7450 * A bug that caused in incorrect behavior when [combining `VecDeque`
7451 with zero-sized types][1.5vdz] was resolved.
7452 * [`PartialOrd` for slices is faster][1.5po].
7457 * [Crate metadata size was reduced by 20%][1.5md].
7458 * [Improvements to code generation reduced the size of libcore by 3.3
7459 MB and rustc's memory usage by 18MB][1.5m].
7460 * [Improvements to deref translation increased performance in
7461 unoptimized builds][1.5dr].
7462 * Various errors in trait resolution [are deduplicated to only be
7463 reported once][1.5te].
7464 * Rust has preliminary [support for rumprun kernels][1.5rr].
7465 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7467 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7468 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7469 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7470 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7471 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7472 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7473 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7474 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7475 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7476 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7477 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7478 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7479 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7480 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7481 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7482 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7483 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7484 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7485 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7486 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7487 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7488 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7489 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7490 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7491 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7492 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7493 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7494 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7495 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7496 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7497 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7498 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7499 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7500 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7501 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7502 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7503 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7504 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7505 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7506 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7507 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7508 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7509 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7510 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7511 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7512 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7513 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7514 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7515 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7516 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7517 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7518 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7519 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7520 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7521 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7522 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7523 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7524 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7525 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7526 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7527 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7528 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7529 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7530 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7531 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7532 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7533 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7534 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7535 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7536 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7537 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7538 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7539 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7540 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7541 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7542 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7543 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7544 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7545 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7546 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7547 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7548 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7549 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7550 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7551 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7552 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7553 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7554 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7555 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7557 Version 1.4.0 (2015-10-29)
7558 ==========================
7560 * ~1200 changes, numerous bugfixes
7565 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7566 GNU) are now supported and recommended for use.
7571 * [Several changes have been made to fix type soundness and improve
7572 the behavior of associated types][sound]. See [RFC 1214]. Although
7573 we have mostly introduced these changes as warnings this release, to
7574 become errors next release, there are still some scenarios that will
7575 see immediate breakage.
7576 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7577 line breaks in addition to `\n`][crlf].
7578 * [Loans of `'static` lifetime extend to the end of a function][stat].
7579 * [`str::parse` no longer introduces avoidable rounding error when
7580 parsing floating point numbers. Together with earlier changes to
7581 float formatting/output, "round trips" like f.to_string().parse()
7582 now preserve the value of f exactly. Additionally, leading plus
7583 signs are now accepted][fp3].
7589 * `use` statements that import multiple items [can now rename
7590 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7591 * [Binops work correctly on fat pointers][binfat].
7592 * `pub extern crate`, which does not behave as expected, [issues a
7593 warning][pec] until a better solution is found.
7598 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7599 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7600 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7601 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7602 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7603 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7604 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7605 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7606 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7607 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7608 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7609 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7610 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7611 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7612 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7613 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7614 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7615 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7617 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7618 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7619 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7620 `f64::from_str_radix`.
7621 * [Reverse-searching strings is faster with the 'two-way'
7623 * [`std::io::copy` allows `?Sized` arguments][cc].
7624 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7625 [override `count`, `nth` and `last` with an O(1)
7626 implementation][it].
7627 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7628 * [`IntoRawFd` has been added to the Unix-specific prelude,
7629 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7631 * [`Extend<String>` and `FromIterator<String` are both implemented for
7633 * [`IntoIterator` is implemented for references to `Option` and
7635 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7636 Copy`][ext] as part of [RFC 839]. This will cause type inference
7637 breakage in rare situations.
7638 * [`BinaryHeap` implements `Debug`][bh2].
7639 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7641 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7642 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7643 * [String comparison is faster][faststr].
7644 * `&mut T` where `T: std::fmt::Write` [also implements
7645 `std::fmt::Write`][mutw].
7646 * [A stable regression in `VecDeque::push_back` and other
7647 capacity-altering methods that caused panics for zero-sized types
7649 * [Function pointers implement traits for up to 12 parameters][fp2].
7654 * The compiler [no longer uses the 'morestack' feature to prevent
7655 stack overflow][mm]. Instead it uses guard pages and stack
7656 probes (though stack probes are not yet implemented on any platform
7658 * [The compiler matches traits faster when projections are involved][p].
7659 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7661 * [Cargo now displays useful information about what its doing during
7662 `cargo update`][cu].
7664 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7665 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7666 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7667 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7668 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7669 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7670 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7671 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7672 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7673 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7674 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7675 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7676 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7677 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7678 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7679 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7680 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7681 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7682 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7683 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7684 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7685 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7686 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7687 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7688 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7689 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7690 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7691 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7692 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7693 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7694 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7695 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7696 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7697 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7698 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7699 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7700 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7701 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7702 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7703 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7704 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7705 [bh2]: https://github.com/rust-lang/rust/pull/28156
7706 [binfat]: https://github.com/rust-lang/rust/pull/28270
7707 [bm]: https://github.com/rust-lang/rust/pull/28197
7708 [cc]: https://github.com/rust-lang/rust/pull/27531
7709 [crlf]: https://github.com/rust-lang/rust/pull/28034
7710 [cu]: https://github.com/rust-lang/cargo/pull/1931
7711 [d]: https://github.com/rust-lang/rust/pull/27825
7712 [dep]: https://github.com/rust-lang/rust/pull/28339
7713 [es]: https://github.com/rust-lang/rust/pull/27956
7714 [ext]: https://github.com/rust-lang/rust/pull/28094
7715 [faststr]: https://github.com/rust-lang/rust/pull/28338
7716 [ffi]: https://github.com/rust-lang/rust/pull/28779
7717 [fp]: https://github.com/rust-lang/rust/pull/28268
7718 [fp2]: https://github.com/rust-lang/rust/pull/28560
7719 [fp3]: https://github.com/rust-lang/rust/pull/27307
7720 [i]: https://github.com/rust-lang/rust/pull/27451
7721 [into2]: https://github.com/rust-lang/rust/pull/28039
7722 [it]: https://github.com/rust-lang/rust/pull/27652
7723 [mm]: https://github.com/rust-lang/rust/pull/27338
7724 [mutw]: https://github.com/rust-lang/rust/pull/28368
7725 [sound]: https://github.com/rust-lang/rust/pull/27641
7726 [p]: https://github.com/rust-lang/rust/pull/27866
7727 [pec]: https://github.com/rust-lang/rust/pull/28486
7728 [pr]: https://github.com/rust-lang/rust/pull/27896
7729 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7730 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7731 [s]: https://github.com/rust-lang/rust/pull/27474
7732 [stab]: https://github.com/rust-lang/rust/pull/28339
7733 [stat]: https://github.com/rust-lang/rust/pull/28321
7734 [vd]: https://github.com/rust-lang/rust/pull/28494
7736 Version 1.3.0 (2015-09-17)
7737 ==============================
7739 * ~900 changes, numerous bugfixes
7744 * The [new object lifetime defaults][nold] have been [turned
7745 on][nold2] after a cycle of warnings about the change. Now types
7746 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7747 being interpreted as `&'a Box<Trait+'a>` to `&'a
7748 Box<Trait+'static>`.
7749 * [The Rustonomicon][nom] is a new book in the official documentation
7750 that dives into writing unsafe Rust.
7751 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7752 timekeeping is employed by other std APIs, as well as out-of-tree
7758 * The [new object lifetime defaults][nold] have been [turned
7759 on][nold2] after a cycle of warnings about the change.
7760 * There is a known [regression][lr] in how object lifetime elision is
7761 interpreted, the proper solution for which is undetermined.
7762 * The `#[prelude_import]` attribute, an internal implementation
7763 detail, was accidentally stabilized previously. [It has been put
7764 behind the `prelude_import` feature gate][pi]. This change is
7765 believed to break no existing code.
7766 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7767 [more sane for dynamically sized types][dst3]. Code that relied on
7768 the previous behavior is thought to be broken.
7769 * The `dropck` rules, which checks that destructors can't access
7770 destroyed values, [have been updated][dropck] to match the
7771 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7772 cause some previously-compiling code to no longer build.
7777 * The [new object lifetime defaults][nold] have been [turned
7778 on][nold2] after a cycle of warnings about the change.
7779 * Semicolons may [now follow types and paths in
7780 macros](https://github.com/rust-lang/rust/pull/27000).
7781 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7782 [more sane for dynamically sized types][dst3]. Code that relied on
7783 the previous behavior is not known to exist, and suspected to be
7785 * `'static` variables [may now be recursive][st].
7786 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7787 implementations correctly.
7788 * The `dropck` rules, which checks that destructors can't access
7789 destroyed values, [have been updated][dropck] to match the
7795 * The [`Duration`] API, [has been stabilized][ds], as well as the
7796 `std::time` module, which presently contains only `Duration`.
7797 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7798 * The owned C string, [`CString`], implements [`Borrow`] and the
7799 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7800 these allow C strings to be borrowed and cloned in generic code.
7801 * [`CStr`] implements [`Debug`].
7802 * [`AtomicPtr`] implements [`Debug`].
7803 * [`Error`] trait objects [can be downcast to their concrete types][e]
7804 in many common configurations, using the [`is`], [`downcast`],
7805 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7807 * Searching for substrings now [employs the two-way algorithm][search]
7808 instead of doing a naive search. This gives major speedups to a
7809 number of methods, including [`contains`][sc], [`find`][sf],
7810 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7811 [`ends_with`][sew] are also faster.
7812 * The performance of `PartialEq` for slices is [much faster][ps].
7813 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7814 is overridden and optimized by the implementations for scalars.
7815 * The [`Hasher`] trait now has a number of specialized `write_*`
7816 methods for primitive types, for efficiency.
7817 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7818 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7819 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7820 of [`std::error::Error::cause`][iec] also delegates to the inner
7822 * [`process::Child`][pc] gained the [`id`] method, which returns a
7823 `u32` representing the platform-specific process identifier.
7824 * The [`connect`] method on slices is deprecated, replaced by the new
7825 [`join`] method (note that both of these are on the *unstable*
7826 [`SliceConcatExt`] trait, but through the magic of the prelude are
7827 available to stable code anyway).
7828 * The [`Div`] operator is implemented for [`Wrapping`] types.
7829 * [`DerefMut` is implemented for `String`][dms].
7830 * Performance of SipHash (the default hasher for `HashMap`) is
7831 [better for long data][sh].
7832 * [`AtomicPtr`] implements [`Send`].
7833 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7834 are now [specialized to use uninitialized buffers for increased
7836 * Lifetime parameters of foreign functions [are now resolved
7842 * Rust can now, with some coercion, [produce programs that run on
7843 Windows XP][xp], though XP is not considered a supported platform.
7844 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7845 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7846 recommended for use in 1.3, though should be fully-functional
7847 in the [64-bit 1.4 beta][b14].
7848 * On Fedora-based systems installation will [properly configure the
7849 dynamic linker][fl].
7850 * The compiler gained many new extended error descriptions, which can
7851 be accessed with the `--explain` flag.
7852 * The `dropck` pass, which checks that destructors can't access
7853 destroyed values, [has been rewritten][dropck]. This fixes some
7854 soundness holes, and as such will cause some previously-compiling
7855 code to no longer build.
7856 * `rustc` now uses [LLVM to write archive files where possible][ar].
7857 Eventually this will eliminate the compiler's dependency on the ar
7859 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7860 supported FreeBSD on x86_64).
7861 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7862 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7864 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7865 will kill the process instead of leaking][nlp].
7867 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7868 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7869 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7870 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7871 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7872 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7873 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7874 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7875 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7876 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7877 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7878 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7879 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7880 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7881 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7882 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7883 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7884 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7885 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7886 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7887 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7888 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7889 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7890 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7891 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7892 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7893 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7894 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7895 [ar]: https://github.com/rust-lang/rust/pull/26926
7896 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7897 [dms]: https://github.com/rust-lang/rust/pull/26241
7898 [dropck]: https://github.com/rust-lang/rust/pull/27261
7899 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7900 [ds]: https://github.com/rust-lang/rust/pull/26818
7901 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7902 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7903 [dst3]: https://github.com/rust-lang/rust/pull/27351
7904 [e]: https://github.com/rust-lang/rust/pull/24793
7905 [f]: https://github.com/rust-lang/rust/pull/26588
7906 [fb]: https://github.com/rust-lang/rust/pull/26959
7907 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7908 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7909 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7910 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7911 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7912 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7913 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7914 [lic]: https://github.com/rust-lang/rust/pull/26583
7915 [lnu]: https://github.com/rust-lang/rust/pull/27026
7916 [lr]: https://github.com/rust-lang/rust/issues/27248
7917 [lum]: https://github.com/rust-lang/rust/pull/26378
7918 [lur]: https://github.com/rust-lang/rust/pull/26783
7919 [nlp]: https://github.com/rust-lang/rust/pull/27176
7920 [nold2]: https://github.com/rust-lang/rust/pull/27045
7921 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7922 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7923 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7924 [pi]: https://github.com/rust-lang/rust/pull/26699
7925 [ps]: https://github.com/rust-lang/rust/pull/26884
7926 [rte]: https://github.com/rust-lang/rust/pull/26950
7927 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7928 [search]: https://github.com/rust-lang/rust/pull/26327
7929 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7930 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7931 [sh]: https://github.com/rust-lang/rust/pull/27280
7932 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7933 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7934 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7935 [st]: https://github.com/rust-lang/rust/pull/26630
7936 [win1]: https://github.com/rust-lang/rust/pull/26569
7937 [win2]: https://github.com/rust-lang/rust/pull/26741
7938 [win3]: https://github.com/rust-lang/rust/pull/26741
7939 [win4]: https://github.com/rust-lang/rust/pull/27210
7940 [xp]: https://github.com/rust-lang/rust/pull/26569
7942 Version 1.2.0 (2015-08-07)
7943 ==========================
7945 * ~1200 changes, numerous bugfixes
7950 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7951 like `Rc` to contain types without a fixed size, arrays and trait
7952 objects, finally enabling use of `Rc<[T]>` and completing the
7953 implementation of DST.
7954 * [Parallel codegen][parcodegen] is now working again, which can
7955 substantially speed up large builds in debug mode; It also gets
7956 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7957 jobs). It's not enabled by default, but will be "in the near
7958 future". It can be activated with the `-C codegen-units=N` flag to
7960 * This is the first release with [experimental support for linking
7961 with the MSVC linker and lib C on Windows (instead of using the GNU
7962 variants via MinGW)][win]. It is yet recommended only for the most
7963 intrepid Rustaceans.
7964 * Benchmark compilations are showing a 30% improvement in
7965 bootstrapping over 1.1.
7970 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7971 unicode case mapping, which is a previously-planned change in
7972 behavior and considered a bugfix.
7973 * [`mem::align_of`] now specifies [the *minimum alignment* for
7974 T][align], which is usually the alignment programs are interested
7975 in, and the same value reported by clang's
7976 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7978 * [The `#[packed]` attribute is no longer silently accepted by the
7979 compiler][packed]. This attribute did nothing and code that
7980 mentioned it likely did not work as intended.
7981 * Associated type defaults are [now behind the
7982 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7983 defaults *did not work*, but could be mentioned syntactically. As
7984 such this breakage has minimal impact.
7989 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7990 matching against dereferenceable values.
7995 * The [`Extend`] trait, which grows a collection from an iterator, is
7996 implemented over iterators of references, for `String`, `Vec`,
7997 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7998 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7999 * The [`iter::once`] function returns an iterator that yields a single
8000 element, and [`iter::empty`] returns an iterator that yields no
8002 * The [`matches`] and [`rmatches`] methods on `str` return iterators
8003 over substring matches.
8004 * [`Cell`] and [`RefCell`] both implement `Eq`.
8005 * A number of methods for wrapping arithmetic are added to the
8006 integral types, [`wrapping_div`], [`wrapping_rem`],
8007 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
8008 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
8009 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
8010 type.. It is illegal for the default arithmetic operations in Rust
8011 to overflow; the desire to wrap must be explicit.
8012 * The `{:#?}` formatting specifier [displays the alternate,
8013 pretty-printed][debugfmt] form of the `Debug` formatter. This
8014 feature was actually introduced prior to 1.0 with little
8016 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
8017 for writing data to formatted strings, similar to [`io::Write`].
8018 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
8019 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
8020 are used by code generators to emit implementations of [`Debug`].
8021 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
8022 methods that convert case, following Unicode case mapping.
8023 * It is now easier to handle poisoned locks. The [`PoisonError`]
8024 type, returned by failing lock operations, exposes `into_inner`,
8025 `get_ref`, and `get_mut`, which all give access to the inner lock
8026 guard, and allow the poisoned lock to continue to operate. The
8027 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
8028 poisoned lock without attempting to take the lock.
8029 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
8030 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
8031 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
8032 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
8034 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8040 * `rustc` employs smarter heuristics for guessing at [typos].
8041 * `rustc` emits more efficient code for [no-op conversions between
8042 unsafe pointers][nop].
8043 * Fat pointers are now [passed in pairs of immediate arguments][fat],
8044 resulting in faster compile times and smaller code.
8046 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
8047 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8048 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
8049 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
8050 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
8051 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
8052 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
8053 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
8054 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
8055 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
8056 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
8057 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
8058 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
8059 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
8060 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
8061 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
8062 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8063 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
8064 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
8065 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
8066 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
8067 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
8068 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
8069 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
8070 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
8071 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8072 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
8073 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
8074 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
8075 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
8076 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
8077 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
8078 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
8079 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8080 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8081 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
8082 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
8083 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
8084 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
8085 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
8086 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
8087 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8088 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
8089 [align]: https://github.com/rust-lang/rust/pull/25646
8090 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
8091 [typos]: https://github.com/rust-lang/rust/pull/26087
8092 [nop]: https://github.com/rust-lang/rust/pull/26336
8093 [fat]: https://github.com/rust-lang/rust/pull/26411
8094 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
8095 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
8096 [packed]: https://github.com/rust-lang/rust/pull/25541
8097 [ad]: https://github.com/rust-lang/rust/pull/27382
8098 [win]: https://github.com/rust-lang/rust/pull/25350
8100 Version 1.1.0 (2015-06-25)
8101 =========================
8103 * ~850 changes, numerous bugfixes
8108 * The [`std::fs` module has been expanded][fs] to expand the set of
8109 functionality exposed:
8110 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
8111 don't incur a syscall on some platforms.
8112 * A `symlink_metadata` function has been added.
8113 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
8114 access to all underlying information.
8115 * The compiler now contains extended explanations of many errors. When an error
8116 with an explanation occurs the compiler suggests using the `--explain` flag
8117 to read the explanation. Error explanations are also [available online][err-index].
8118 * Thanks to multiple [improvements][sk] to [type checking][pre], as
8119 well as other work, the time to bootstrap the compiler decreased by
8125 * The [`str::split_whitespace`] method splits a string on unicode
8126 whitespace boundaries.
8127 * On both Windows and Unix, new extension traits provide conversion of
8128 I/O types to and from the underlying system handles. On Unix, these
8129 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
8130 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
8131 `TcpListener`, and `UpdSocket`. Further implementations for
8132 `std::process` will be stabilized later.
8133 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
8134 Windows, symlinks can be created with
8135 `std::os::windows::symlink_dir` and
8136 `std::os::windows::symlink_file`.
8137 * The `mpsc::Receiver` type can now be converted into an iterator with
8138 `into_iter` on the [`IntoIterator`] trait.
8139 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
8140 implementation of the [`From`] trait.
8141 * The `Debug` implementation for `RangeFull` [creates output that is
8142 more consistent with other implementations][rf].
8143 * [`Debug` is implemented for `File`][file].
8144 * The `Default` implementation for `Arc` [no longer requires `Sync +
8146 * [The `Iterator` methods `count`, `nth`, and `last` have been
8147 overridden for slices to have O(1) performance instead of O(n)][si].
8148 * Incorrect handling of paths on Windows has been improved in both the
8149 compiler and the standard library.
8150 * [`AtomicPtr` gained a `Default` implementation][ap].
8151 * In accordance with Rust's policy on arithmetic overflow `abs` now
8152 [panics on overflow when debug assertions are enabled][abs].
8153 * The [`Cloned`] iterator, which was accidentally left unstable for
8154 1.0 [has been stabilized][c].
8155 * The [`Incoming`] iterator, which iterates over incoming TCP
8156 connections, and which was accidentally unnamable in 1.0, [is now
8157 properly exported][inc].
8158 * [`BinaryHeap`] no longer corrupts itself [when functions called by
8159 `sift_up` or `sift_down` panic][bh].
8160 * The [`split_off`] method of `LinkedList` [no longer corrupts
8161 the list in certain scenarios][ll].
8166 * Type checking performance [has improved notably][sk] with
8167 [multiple improvements][pre].
8168 * The compiler [suggests code changes][ch] for more errors.
8169 * rustc and it's build system have experimental support for [building
8170 toolchains against MUSL][m] instead of glibc on Linux.
8171 * The compiler defines the `target_env` cfg value, which is used for
8172 distinguishing toolchains that are otherwise for the same
8173 platform. Presently this is set to `gnu` for common GNU Linux
8174 targets and for MinGW targets, and `musl` for MUSL Linux targets.
8175 * The [`cargo rustc`][crc] command invokes a build with custom flags
8177 * [Android executables are always position independent][pie].
8178 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8181 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
8182 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
8183 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
8184 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
8185 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
8186 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
8187 [rf]: https://github.com/rust-lang/rust/pull/24491
8188 [err-index]: https://doc.rust-lang.org/error-index.html
8189 [sk]: https://github.com/rust-lang/rust/pull/24615
8190 [pre]: https://github.com/rust-lang/rust/pull/25323
8191 [file]: https://github.com/rust-lang/rust/pull/24598
8192 [ch]: https://github.com/rust-lang/rust/pull/24683
8193 [arc]: https://github.com/rust-lang/rust/pull/24695
8194 [si]: https://github.com/rust-lang/rust/pull/24701
8195 [ap]: https://github.com/rust-lang/rust/pull/24834
8196 [m]: https://github.com/rust-lang/rust/pull/24777
8197 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
8198 [crc]: https://github.com/rust-lang/cargo/pull/1568
8199 [pie]: https://github.com/rust-lang/rust/pull/24953
8200 [abs]: https://github.com/rust-lang/rust/pull/25441
8201 [c]: https://github.com/rust-lang/rust/pull/25496
8202 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
8203 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
8204 [inc]: https://github.com/rust-lang/rust/pull/25522
8205 [bh]: https://github.com/rust-lang/rust/pull/25856
8206 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
8207 [ll]: https://github.com/rust-lang/rust/pull/26022
8208 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
8209 [drop]: https://github.com/rust-lang/rust/pull/24935
8211 Version 1.0.0 (2015-05-15)
8212 ========================
8214 * ~1500 changes, numerous bugfixes
8219 * The vast majority of the standard library is now `#[stable]`. It is
8220 no longer possible to use unstable features with a stable build of
8222 * Many popular crates on [crates.io] now work on the stable release
8224 * Arithmetic on basic integer types now [checks for overflow in debug
8230 * Several [restrictions have been added to trait coherence][coh] in
8231 order to make it easier for upstream authors to change traits
8232 without breaking downstream code.
8233 * Digits of binary and octal literals are [lexed more eagerly][lex] to
8234 improve error messages and macro behavior. For example, `0b1234` is
8235 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
8236 * Trait bounds [are always invariant][inv], eliminating the need for
8237 the `PhantomFn` and `MarkerTrait` lang items, which have been
8239 * ["-" is no longer a valid character in crate names][cr], the `extern crate
8240 "foo" as bar` syntax has been replaced with `extern crate foo as
8241 bar`, and Cargo now automatically translates "-" in *package* names
8242 to underscore for the crate name.
8243 * [Lifetime shadowing is an error][lt].
8244 * [`Send` no longer implies `'static`][send-rfc].
8245 * [UFCS now supports trait-less associated paths][moar-ufcs] like
8246 `MyType::default()`.
8247 * Primitive types [now have inherent methods][prim-inherent],
8248 obviating the need for extension traits like `SliceExt`.
8249 * Methods with `Self: Sized` in their `where` clause are [considered
8250 object-safe][self-sized], allowing many extension traits like
8251 `IteratorExt` to be merged into the traits they extended.
8252 * You can now [refer to associated types][assoc-where] whose
8253 corresponding trait bounds appear only in a `where` clause.
8254 * The final bits of [OIBIT landed][oibit-final], meaning that traits
8255 like `Send` and `Sync` are now library-defined.
8256 * A [Reflect trait][reflect] was introduced, which means that
8257 downcasting via the `Any` trait is effectively limited to concrete
8258 types. This helps retain the potentially-important "parametricity"
8259 property: generic code cannot behave differently for different type
8260 arguments except in minor ways.
8261 * The `unsafe_destructor` feature is now deprecated in favor of the
8262 [new `dropck`][dropck]. This change is a major reduction in unsafe
8268 * The `thread_local` module [has been renamed to `std::thread`][th].
8269 * The methods of `IteratorExt` [have been moved to the `Iterator`
8271 * Several traits that implement Rust's conventions for type
8272 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
8273 [centralized in the `std::convert` module][con].
8274 * The `FromError` trait [was removed in favor of `From`][fe].
8275 * The basic sleep function [has moved to
8276 `std::thread::sleep_ms`][slp].
8277 * The `splitn` function now takes an `n` parameter that represents the
8278 number of items yielded by the returned iterator [instead of the
8279 number of 'splits'][spl].
8280 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
8281 * [Derived implementations of `PartialOrd` now order enums according
8282 to their explicitly-assigned discriminants][po].
8283 * [Methods for searching strings are generic over `Pattern`s][pat],
8284 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
8286 * [In method resolution, object methods are resolved before inherent
8288 * [`String::from_str` has been deprecated in favor of the `From` impl,
8289 `String::from`][sf].
8290 * [`io::Error` implements `Sync`][ios].
8291 * [The `words` method on `&str` has been replaced with
8292 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
8294 * The new path and IO modules are complete and `#[stable]`. This
8295 was the major library focus for this cycle.
8296 * The path API was [revised][path-normalize] to normalize `.`,
8297 adjusting the tradeoffs in favor of the most common usage.
8298 * A large number of remaining APIs in `std` were also stabilized
8299 during this cycle; about 75% of the non-deprecated API surface
8301 * The new [string pattern API][string-pattern] landed, which makes
8302 the string slice API much more internally consistent and flexible.
8303 * A new set of [generic conversion traits][conversion] replaced
8304 many existing ad hoc traits.
8305 * Generic numeric traits were [completely removed][num-traits]. This
8306 was made possible thanks to inherent methods for primitive types,
8307 and the removal gives maximal flexibility for designing a numeric
8308 hierarchy in the future.
8309 * The `Fn` traits are now related via [inheritance][fn-inherit]
8310 and provide ergonomic [blanket implementations][fn-blanket].
8311 * The `Index` and `IndexMut` traits were changed to
8312 [take the index by value][index-value], enabling code like
8313 `hash_map["string"]` to work.
8314 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
8315 `Copy` data is known to be `Clone` as well.
8320 * Many errors now have extended explanations that can be accessed with
8321 the `--explain` flag to `rustc`.
8322 * Many new examples have been added to the standard library
8324 * rustdoc has received a number of improvements focused on completion
8326 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
8327 * Much headway was made on ecosystem-wide CI, making it possible
8328 to [compare builds for breakage][ci-compare].
8331 [crates.io]: http://crates.io
8332 [clo]: https://github.com/rust-lang/rust/pull/24034
8333 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
8334 [con]: https://github.com/rust-lang/rust/pull/23875
8335 [cr]: https://github.com/rust-lang/rust/pull/23419
8336 [fe]: https://github.com/rust-lang/rust/pull/23879
8337 [ie]: https://github.com/rust-lang/rust/pull/23300
8338 [inv]: https://github.com/rust-lang/rust/pull/23938
8339 [ios]: https://github.com/rust-lang/rust/pull/24133
8340 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
8341 [lt]: https://github.com/rust-lang/rust/pull/24057
8342 [meth]: https://github.com/rust-lang/rust/pull/24056
8343 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
8344 [po]: https://github.com/rust-lang/rust/pull/24270
8345 [sf]: https://github.com/rust-lang/rust/pull/24517
8346 [slp]: https://github.com/rust-lang/rust/pull/23949
8347 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
8348 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
8349 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
8350 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
8351 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
8352 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
8353 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
8354 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
8355 [self-sized]: https://github.com/rust-lang/rust/pull/22301
8356 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
8357 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
8358 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
8359 [reflect]: https://github.com/rust-lang/rust/pull/23712
8360 [conversion]: https://github.com/rust-lang/rfcs/pull/529
8361 [num-traits]: https://github.com/rust-lang/rust/pull/23549
8362 [index-value]: https://github.com/rust-lang/rust/pull/23601
8363 [dropck]: https://github.com/rust-lang/rfcs/pull/769
8364 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
8365 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
8366 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
8367 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
8368 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
8371 Version 1.0.0-alpha.2 (2015-02-20)
8372 =====================================
8374 * ~1300 changes, numerous bugfixes
8378 * The various I/O modules were [overhauled][io-rfc] to reduce
8379 unnecessary abstractions and provide better interoperation with
8380 the underlying platform. The old `io` module remains temporarily
8382 * The standard library now [participates in feature gating][feat],
8383 so use of unstable libraries now requires a `#![feature(...)]`
8384 attribute. The impact of this change is [described on the
8385 forum][feat-forum]. [RFC][feat-rfc].
8389 * `for` loops [now operate on the `IntoIterator` trait][into],
8390 which eliminates the need to call `.iter()`, etc. to iterate
8391 over collections. There are some new subtleties to remember
8392 though regarding what sort of iterators various types yield, in
8393 particular that `for foo in bar { }` yields values from a move
8394 iterator, destroying the original collection. [RFC][into-rfc].
8395 * Objects now have [default lifetime bounds][obj], so you don't
8396 have to write `Box<Trait+'static>` when you don't care about
8397 storing references. [RFC][obj-rfc].
8398 * In types that implement `Drop`, [lifetimes must outlive the
8399 value][drop]. This will soon make it possible to safely
8400 implement `Drop` for types where `#[unsafe_destructor]` is now
8401 required. Read the [gorgeous RFC][drop-rfc] for details.
8402 * The fully qualified <T as Trait>::X syntax lets you set the Self
8403 type for a trait method or associated type. [RFC][ufcs-rfc].
8404 * References to types that implement `Deref<U>` now [automatically
8405 coerce to references][deref] to the dereferenced type `U`,
8406 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
8407 should eliminate many unsightly uses of `&*`, as when converting
8408 from references to vectors into references to
8409 slices. [RFC][deref-rfc].
8410 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
8411 `|:|`) is obsolete and closure kind is inferred from context.
8412 * [`Self` is a keyword][Self].
8416 * The `Show` and `String` formatting traits [have been
8417 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8418 their related purposes. Automatically getting a string
8419 conversion to use with `format!("{:?}", something_to_debug)` is
8420 now written `#[derive(Debug)]`.
8421 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8422 OsStr}`, provide strings in platform-specific encodings for easier
8423 interop with system APIs. [RFC][osstr-rfc].
8424 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8425 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8426 creating raw pointers.
8430 * Certain long error messages of the form 'expected foo found bar'
8431 are now [split neatly across multiple
8432 lines][multiline]. Examples in the PR.
8433 * On Unix Rust can be [uninstalled][un] by running
8434 `/usr/local/lib/rustlib/uninstall.sh`.
8435 * The `#[rustc_on_unimplemented]` attribute, requiring the
8436 'on_unimplemented' feature, lets rustc [display custom error
8437 messages when a trait is expected to be implemented for a type
8442 * Rust is tested against a [LALR grammar][lalr], which parses
8443 almost all the Rust files that rustc does.
8445 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8446 [close]: https://github.com/rust-lang/rust/pull/21843
8447 [deref]: https://github.com/rust-lang/rust/pull/21351
8448 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8449 [drop]: https://github.com/rust-lang/rust/pull/21972
8450 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8451 [feat]: https://github.com/rust-lang/rust/pull/21248
8452 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8453 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8454 [fmt]: https://github.com/rust-lang/rust/pull/21457
8455 [into]: https://github.com/rust-lang/rust/pull/20790
8456 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8457 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8458 [lalr]: https://github.com/rust-lang/rust/pull/21452
8459 [multiline]: https://github.com/rust-lang/rust/pull/19870
8460 [obj]: https://github.com/rust-lang/rust/pull/22230
8461 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8462 [onun]: https://github.com/rust-lang/rust/pull/20889
8463 [osstr]: https://github.com/rust-lang/rust/pull/21488
8464 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8465 [Self]: https://github.com/rust-lang/rust/pull/22158
8466 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8467 [un]: https://github.com/rust-lang/rust/pull/22256
8470 Version 1.0.0-alpha (2015-01-09)
8471 ==================================
8473 * ~2400 changes, numerous bugfixes
8477 * The language itself is considered feature complete for 1.0,
8478 though there will be many usability improvements and bugfixes
8479 before the final release.
8480 * Nearly 50% of the public API surface of the standard library has
8481 been declared 'stable'. Those interfaces are unlikely to change
8483 * The long-running debate over integer types has been
8484 [settled][ints]: Rust will ship with types named `isize` and
8485 `usize`, rather than `int` and `uint`, for pointer-sized
8486 integers. Guidelines will be rolled out during the alpha cycle.
8487 * Most crates that are not `std` have been moved out of the Rust
8488 distribution into the Cargo ecosystem so they can evolve
8489 separately and don't need to be stabilized as quickly, including
8490 'time', 'getopts', 'num', 'regex', and 'term'.
8491 * Documentation continues to be expanded with more API coverage, more
8492 examples, and more in-depth explanations. The guides have been
8493 consolidated into [The Rust Programming Language][trpl].
8494 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8495 * All official Rust binary installers now come with [Cargo], the
8496 Rust package manager.
8500 * Closures have been [completely redesigned][unboxed] to be
8501 implemented in terms of traits, can now be used as generic type
8502 bounds and thus monomorphized and inlined, or via an opaque
8503 pointer (boxed) as in the old system. The new system is often
8504 referred to as 'unboxed' closures.
8505 * Traits now support [associated types][assoc], allowing families
8506 of related types to be defined together and used generically in
8508 * Enum variants are [namespaced by their type names][enum].
8509 * [`where` clauses][where] provide a more versatile and attractive
8510 syntax for specifying generic bounds, though the previous syntax
8512 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8514 * Rust [no longer has a runtime][rt] of any description, and only
8515 supports OS threads, not green threads.
8516 * At long last, Rust has been overhauled for 'dynamically-sized
8517 types' ([DST]), which integrates 'fat pointers' (object types,
8518 arrays, and `str`) more deeply into the type system, making it
8520 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8521 `..j` that produce range types and which, when combined with the
8522 `Index` operator and multidispatch, leads to a convenient slice
8524 * The new range syntax revealed an ambiguity in the fixed-length
8525 array syntax, so now fixed length arrays [are written `[T;
8527 * The `Copy` trait is no longer implemented automatically. Unsafe
8528 pointers no longer implement `Sync` and `Send` so types
8529 containing them don't automatically either. `Sync` and `Send`
8530 are now 'unsafe traits' so one can "forcibly" implement them via
8531 `unsafe impl` if a type confirms to the requirements for them
8532 even though the internals do not (e.g. structs containing unsafe
8533 pointers like `Arc`). These changes are intended to prevent some
8534 footguns and are collectively known as [opt-in built-in
8535 traits][oibit] (though `Sync` and `Send` will soon become pure
8536 library types unknown to the compiler).
8537 * Operator traits now take their operands [by value][ops], and
8538 comparison traits can use multidispatch to compare one type
8539 against multiple other types, allowing e.g. `String` to be
8540 compared with `&str`.
8541 * `if let` and `while let` are no longer feature-gated.
8542 * Rust has adopted a more [uniform syntax for escaping unicode
8543 characters][unicode].
8544 * `macro_rules!` [has been declared stable][mac]. Though it is a
8545 flawed system it is sufficiently popular that it must be usable
8546 for 1.0. Effort has gone into [future-proofing][mac-future] it
8547 in ways that will allow other macro systems to be developed in
8548 parallel, and won't otherwise impact the evolution of the
8550 * The prelude has been [pared back significantly][prelude] such
8551 that it is the minimum necessary to support the most pervasive
8552 code patterns, and through [generalized where clauses][where]
8553 many of the prelude extension traits have been consolidated.
8554 * Rust's rudimentary reflection [has been removed][refl], as it
8555 incurred too much code generation for little benefit.
8556 * [Struct variants][structvars] are no longer feature-gated.
8557 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8558 known as 'higher-ranked trait bounds', this crucially allows
8559 unboxed closures to work.
8560 * Macros invocations surrounded by parens or square brackets and
8561 not terminated by a semicolon are [parsed as
8562 expressions][macros], which makes expressions like `vec![1i32,
8563 2, 3].len()` work as expected.
8564 * Trait objects now implement their traits automatically, and
8565 traits that can be coerced to objects now must be [object
8567 * Automatically deriving traits is now done with `#[derive(...)]`
8568 not `#[deriving(...)]` for [consistency with other naming
8569 conventions][derive].
8570 * Importing the containing module or enum at the same time as
8571 items or variants they contain is [now done with `self` instead
8572 of `mod`][self], as in use `foo::{self, bar}`
8573 * Glob imports are no longer feature-gated.
8574 * The `box` operator and `box` patterns have been feature-gated
8575 pending a redesign. For now unique boxes should be allocated
8576 like other containers, with `Box::new`.
8580 * A [series][coll1] of [efforts][coll2] to establish
8581 [conventions][coll3] for collections types has resulted in API
8582 improvements throughout the standard library.
8583 * New [APIs for error handling][err] provide ergonomic interop
8584 between error types, and [new conventions][err-conv] describe
8585 more clearly the recommended error handling strategies in Rust.
8586 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8587 it is easier to discuss failure in the context of error handling
8588 without making clarifications as to whether you are referring to
8589 the 'fail' macro or failure more generally.
8590 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8591 syscall when available.
8592 * The 'serialize' crate has been renamed 'rustc-serialize' and
8593 moved out of the distribution to Cargo. Although it is widely
8594 used now, it is expected to be superseded in the near future.
8595 * The `Show` formatter, typically implemented with
8596 `#[derive(Show)]` is [now requested with the `{:?}`
8597 specifier][show] and is intended for use by all types, for uses
8598 such as `println!` debugging. The new `String` formatter must be
8599 implemented by hand, uses the `{}` specifier, and is intended
8600 for full-fidelity conversions of things that can logically be
8601 represented as strings.
8605 * [Flexible target specification][flex] allows rustc's code
8606 generation to be configured to support otherwise-unsupported
8608 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8609 respective debuggers with Rust-appropriate pretty-printing.
8610 * The Windows installation of Rust is distributed with the
8611 MinGW components currently required to link binaries on that
8616 * Nullable enum optimizations have been extended to more types so
8617 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8618 space than the inner types themselves.
8619 * Work has begun on supporting AArch64.
8621 [Cargo]: https://crates.io
8622 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8623 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8624 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8625 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8626 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8627 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8628 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8629 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8630 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8631 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8632 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8633 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8634 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8635 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8636 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8637 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8638 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8639 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8640 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8641 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8642 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8643 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8644 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8645 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8646 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8647 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8648 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8649 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8650 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8651 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8652 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8653 [trpl]: https://doc.rust-lang.org/book/index.html
8654 [rbe]: http://rustbyexample.com/
8657 Version 0.12.0 (2014-10-09)
8658 =============================
8660 * ~1900 changes, numerous bugfixes
8664 * The introductory documentation (now called The Rust Guide) has
8665 been completely rewritten, as have a number of supplementary
8667 * Rust's package manager, Cargo, continues to improve and is
8668 sometimes considered to be quite awesome.
8669 * Many API's in `std` have been reviewed and updated for
8670 consistency with the in-development Rust coding
8671 guidelines. The standard library documentation tracks
8672 stabilization progress.
8673 * Minor libraries have been moved out-of-tree to the rust-lang org
8674 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8675 be installed with Cargo.
8676 * Lifetime elision allows lifetime annotations to be left off of
8677 function declarations in many common scenarios.
8678 * Rust now works on 64-bit Windows.
8681 * Indexing can be overloaded with the `Index` and `IndexMut`
8683 * The `if let` construct takes a branch only if the `let` pattern
8684 matches, currently behind the 'if_let' feature gate.
8685 * 'where clauses', a more flexible syntax for specifying trait
8686 bounds that is more aesthetic, have been added for traits and
8687 free functions. Where clauses will in the future make it
8688 possible to constrain associated types, which would be
8689 impossible with the existing syntax.
8690 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8691 the 'slicing_syntax' feature gate, and can be overloaded with
8692 the `Slice` or `SliceMut` traits.
8693 * The syntax for matching of sub-slices has been changed to use a
8694 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8695 consistency with other uses of `..` and to future-proof
8696 potential additional uses of the syntax.
8697 * The syntax for matching inclusive ranges in patterns has changed
8698 from `0..3` to `0...4` to be consistent with the exclusive range
8700 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8701 c]`) has been put behind the 'advanced_slice_patterns' feature
8702 gate and may be removed in the future.
8703 * Components of tuples and tuple structs can be extracted using
8704 the `value.0` syntax, currently behind the `tuple_indexing`
8706 * The `#[crate_id]` attribute is no longer supported; versioning
8707 is handled by the package manager.
8708 * Renaming crate imports are now written `extern crate foo as bar`
8709 instead of `extern crate bar = foo`.
8710 * Renaming use statements are now written `use foo as bar` instead
8712 * `let` and `match` bindings and argument names in macros are now
8714 * The new, more efficient, closure types ('unboxed closures') have
8715 been added under a feature gate, 'unboxed_closures'. These will
8716 soon replace the existing closure types, once higher-ranked
8717 trait lifetimes are added to the language.
8718 * `move` has been added as a keyword, for indicating closures
8719 that capture by value.
8720 * Mutation and assignment is no longer allowed in pattern guards.
8721 * Generic structs and enums can now have trait bounds.
8722 * The `Share` trait is now called `Sync` to free up the term
8723 'shared' to refer to 'shared reference' (the default reference
8725 * Dynamically-sized types have been mostly implemented,
8726 unifying the behavior of fat-pointer types with the rest of the
8728 * As part of dynamically-sized types, the `Sized` trait has been
8729 introduced, which qualifying types implement by default, and
8730 which type parameters expect by default. To specify that a type
8731 parameter does not need to be sized, write `<Sized? T>`. Most
8732 types are `Sized`, notable exceptions being unsized arrays
8733 (`[T]`) and trait types.
8734 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8735 * Lifetime bounds can now be applied to type parameters and object
8737 * The old, reference counted GC type, `Gc<T>` which was once
8738 denoted by the `@` sigil, has finally been removed. GC will be
8739 revisited in the future.
8742 * Library documentation has been improved for a number of modules.
8743 * Bit-vectors, collections::bitv has been modernized.
8744 * The url crate is deprecated in favor of
8745 http://github.com/servo/rust-url, which can be installed with
8747 * Most I/O stream types can be cloned and subsequently closed from
8749 * A `std::time::Duration` type has been added for use in I/O
8750 methods that rely on timers, as well as in the 'time' crate's
8751 `Timespec` arithmetic.
8752 * The runtime I/O abstraction layer that enabled the green thread
8753 scheduler to do non-thread-blocking I/O has been removed, along
8754 with the libuv-based implementation employed by the green thread
8755 scheduler. This will greatly simplify the future I/O work.
8756 * `collections::btree` has been rewritten to have a more
8757 idiomatic and efficient design.
8760 * rustdoc output now indicates the stability levels of API's.
8761 * The `--crate-name` flag can specify the name of the crate
8762 being compiled, like `#[crate_name]`.
8763 * The `-C metadata` specifies additional metadata to hash into
8764 symbol names, and `-C extra-filename` specifies additional
8765 information to put into the output filename, for use by the
8766 package manager for versioning.
8767 * debug info generation has continued to improve and should be
8768 more reliable under both gdb and lldb.
8769 * rustc has experimental support for compiling in parallel
8770 using the `-C codegen-units` flag.
8771 * rustc no longer encodes rpath information into binaries by
8775 * Stack usage has been optimized with LLVM lifetime annotations.
8776 * Official Rust binaries on Linux are more compatible with older
8777 kernels and distributions, built on CentOS 5.10.
8780 Version 0.11.0 (2014-07-02)
8781 ==========================
8783 * ~1700 changes, numerous bugfixes
8786 * ~[T] has been removed from the language. This type is superseded by
8788 * ~str has been removed from the language. This type is superseded by
8790 * ~T has been removed from the language. This type is superseded by the
8792 * @T has been removed from the language. This type is superseded by the
8793 standard library's std::gc::Gc<T> type.
8794 * Struct fields are now all private by default.
8795 * Vector indices and shift amounts are both required to be a `uint`
8796 instead of any integral type.
8797 * Byte character, byte string, and raw byte string literals are now all
8798 supported by prefixing the normal literal with a `b`.
8799 * Multiple ABIs are no longer allowed in an ABI string
8800 * The syntax for lifetimes on closures/procedures has been tweaked
8801 slightly: `<'a>|A, B|: 'b + K -> T`
8802 * Floating point modulus has been removed from the language; however it
8803 is still provided by a library implementation.
8804 * Private enum variants are now disallowed.
8805 * The `priv` keyword has been removed from the language.
8806 * A closure can no longer be invoked through a &-pointer.
8807 * The `use foo, bar, baz;` syntax has been removed from the language.
8808 * The transmute intrinsic no longer works on type parameters.
8809 * Statics now allow blocks/items in their definition.
8810 * Trait bounds are separated from objects with + instead of : now.
8811 * Objects can no longer be read while they are mutably borrowed.
8812 * The address of a static is now marked as insignificant unless the
8813 #[inline(never)] attribute is placed it.
8814 * The #[unsafe_destructor] attribute is now behind a feature gate.
8815 * Struct literals are no longer allowed in ambiguous positions such as
8816 if, while, match, and for..in.
8817 * Declaration of lang items and intrinsics are now feature-gated by
8819 * Integral literals no longer default to `int`, and floating point
8820 literals no longer default to `f64`. Literals must be suffixed with an
8821 appropriate type if inference cannot determine the type of the
8823 * The Box<T> type is no longer implicitly borrowed to &mut T.
8824 * Procedures are now required to not capture borrowed references.
8827 * The standard library is now a "facade" over a number of underlying
8828 libraries. This means that development on the standard library should
8829 be speedier due to smaller crates, as well as a clearer line between
8831 * A new library, libcore, lives under the standard library's facade
8832 which is Rust's "0-assumption" library, suitable for embedded and
8833 kernel development for example.
8834 * A regex crate has been added to the standard distribution. This crate
8835 includes statically compiled regular expressions.
8836 * The unwrap/unwrap_err methods on Result require a Show bound for
8837 better error messages.
8838 * The return types of the std::comm primitives have been centralized
8839 around the Result type.
8840 * A number of I/O primitives have gained the ability to time out their
8842 * A number of I/O primitives have gained the ability to close their
8843 reading/writing halves to cancel pending operations.
8844 * Reverse iterator methods have been removed in favor of `rev()` on
8845 their forward-iteration counterparts.
8846 * A bitflags! macro has been added to enable easy interop with C and
8847 management of bit flags.
8848 * A debug_assert! macro is now provided which is disabled when
8849 `--cfg ndebug` is passed to the compiler.
8850 * A graphviz crate has been added for creating .dot files.
8851 * The std::cast module has been migrated into std::mem.
8852 * The std::local_data api has been migrated from freestanding functions
8853 to being based on methods.
8854 * The Pod trait has been renamed to Copy.
8855 * jemalloc has been added as the default allocator for types.
8856 * The API for allocating memory has been changed to use proper alignment
8857 and sized deallocation
8858 * Connecting a TcpStream or binding a TcpListener is now based on a
8859 string address and a u16 port. This allows connecting to a hostname as
8861 * The Reader trait now contains a core method, read_at_least(), which
8862 correctly handles many repeated 0-length reads.
8863 * The process-spawning API is now centered around a builder-style
8865 * The :? printing qualifier has been moved from the standard library to
8866 an external libdebug crate.
8867 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8868 have been renamed to Eq/Ord.
8869 * The select/plural methods have been removed from format!. The escapes
8870 for { and } have also changed from \{ and \} to {{ and }},
8872 * The TaskBuilder API has been re-worked to be a true builder, and
8873 extension traits for spawning native/green tasks have been added.
8876 * All breaking changes to the language or libraries now have their
8877 commit message annotated with `[breaking-change]` to allow for easy
8878 discovery of breaking changes.
8879 * The compiler will now try to suggest how to annotate lifetimes if a
8880 lifetime-related error occurs.
8881 * Debug info continues to be improved greatly with general bug fixes and
8882 better support for situations like link time optimization (LTO).
8883 * Usage of syntax extensions when cross-compiling has been fixed.
8884 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8885 -fdata-sections and --gc-sections has been enabled by default
8886 * The compiler is now stricter about where it will load module files
8887 from when a module is declared via `mod foo;`.
8888 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8889 Syntax extensions are now discovered via a "plugin registrar" type
8890 which will be extended in the future to other various plugins.
8891 * Lints have been restructured to allow for dynamically loadable lints.
8892 * A number of rustdoc improvements:
8893 * The HTML output has been visually redesigned.
8894 * Markdown is now powered by hoedown instead of sundown.
8895 * Searching heuristics have been greatly improved.
8896 * The search index has been reduced in size by a great amount.
8897 * Cross-crate documentation via `pub use` has been greatly improved.
8898 * Primitive types are now hyperlinked and documented.
8899 * Documentation has been moved from static.rust-lang.org/doc to
8901 * A new sandbox, play.rust-lang.org, is available for running and
8902 sharing rust code examples on-line.
8903 * Unused attributes are now more robustly warned about.
8904 * The dead_code lint now warns about unused struct fields.
8905 * Cross-compiling to iOS is now supported.
8906 * Cross-compiling to mipsel is now supported.
8907 * Stability attributes are now inherited by default and no longer apply
8908 to intra-crate usage, only inter-crate usage.
8909 * Error message related to non-exhaustive match expressions have been
8913 Version 0.10 (2014-04-03)
8914 =========================
8916 * ~1500 changes, numerous bugfixes
8919 * A new RFC process is now in place for modifying the language.
8920 * Patterns with `@`-pointers have been removed from the language.
8921 * Patterns with unique vectors (`~[T]`) have been removed from the
8923 * Patterns with unique strings (`~str`) have been removed from the
8925 * `@str` has been removed from the language.
8926 * `@[T]` has been removed from the language.
8927 * `@self` has been removed from the language.
8928 * `@Trait` has been removed from the language.
8929 * Headers on `~` allocations which contain `@` boxes inside the type for
8930 reference counting have been removed.
8931 * The semantics around the lifetimes of temporary expressions have changed,
8932 see #3511 and #11585 for more information.
8933 * Cross-crate syntax extensions are now possible, but feature gated. See
8934 #11151 for more information. This includes both `macro_rules!` macros as
8935 well as syntax extensions such as `format!`.
8936 * New lint modes have been added, and older ones have been turned on to be
8938 * Unnecessary parentheses
8941 * Uppercase variables
8942 * Publicly visible private types
8943 * `#[deriving]` with raw pointers
8944 * Unsafe functions can no longer be coerced to closures.
8945 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8946 * The `#[simd]` attribute is now behind a feature gate.
8947 * Visibility is no longer allowed on `extern crate` statements, and
8948 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8949 * Trailing commas are now allowed in argument lists and tuple patterns.
8950 * The `do` keyword has been removed, it is now a reserved keyword.
8951 * Default type parameters have been implemented, but are feature gated.
8952 * Borrowed variables through captures in closures are now considered soundly.
8953 * `extern mod` is now `extern crate`
8954 * The `Freeze` trait has been removed.
8955 * The `Share` trait has been added for types that can be shared among
8957 * Labels in macros are now hygienic.
8958 * Expression/statement macro invocations can be delimited with `{}` now.
8959 * Treatment of types allowed in `static mut` locations has been tweaked.
8960 * The `*` and `.` operators are now overloadable through the `Deref` and
8962 * `~Trait` and `proc` no longer have `Send` bounds by default.
8963 * Partial type hints are now supported with the `_` type marker.
8964 * An `Unsafe` type was introduced for interior mutability. It is now
8965 considered undefined to transmute from `&T` to `&mut T` without using the
8967 * The #[linkage] attribute was implemented for extern statics/functions.
8968 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8969 * `Pod` was renamed to `Copy`.
8972 * The `libextra` library has been removed. It has now been decomposed into
8973 component libraries with smaller and more focused nuggets of
8974 functionality. The full list of libraries can be found on the
8975 documentation index page.
8976 * std: `std::condition` has been removed. All I/O errors are now propagated
8977 through the `Result` type. In order to assist with error handling, a
8978 `try!` macro for unwrapping errors with an early return and a lint for
8979 unused results has been added. See #12039 for more information.
8980 * std: The `vec` module has been renamed to `slice`.
8981 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8982 This will become the only growable vector in the future.
8983 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8984 are now found at `std::io::BufferedReader` instead of
8985 `std::io::buffered::BufferedReader`.
8986 * std: `print` and `println` are no longer in the prelude, the `print!` and
8987 `println!` macros are intended to be used instead.
8988 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8989 attempts to statically prevent cycles.
8990 * std: The standard distribution is adopting the policy of pushing failure
8991 to the user rather than failing in libraries. Many functions (such as
8992 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8993 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8994 deriving mode: `#[deriving(Show)]`.
8995 * std: `ToStr` is now implemented for all types implementing `Show`.
8996 * std: The formatting trait methods now take `&self` instead of `&T`
8997 * std: The `invert()` method on iterators has been renamed to `rev()`
8998 * std: `std::num` has seen a reduction in the genericity of its traits,
8999 consolidating functionality into a few core traits.
9000 * std: Backtraces are now printed on task failure if the environment
9001 variable `RUST_BACKTRACE` is present.
9002 * std: Naming conventions for iterators have been standardized. More details
9003 can be found on the wiki's style guide.
9004 * std: `eof()` has been removed from the `Reader` trait. Specific types may
9005 still implement the function.
9006 * std: Networking types are now cloneable to allow simultaneous reads/writes.
9007 * std: `assert_approx_eq!` has been removed
9008 * std: The `e` and `E` formatting specifiers for floats have been added to
9009 print them in exponential notation.
9010 * std: The `Times` trait has been removed
9011 * std: Indications of variance and opting out of builtin bounds is done
9012 through marker types in `std::kinds::marker` now
9013 * std: `hash` has been rewritten, `IterBytes` has been removed, and
9014 `#[deriving(Hash)]` is now possible.
9015 * std: `SharedChan` has been removed, `Sender` is now cloneable.
9016 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
9017 * std: `Chan::new` is now `channel()`.
9018 * std: A new synchronous channel type has been implemented.
9019 * std: A `select!` macro is now provided for selecting over `Receiver`s.
9020 * std: `hashmap` and `trie` have been moved to `libcollections`
9021 * std: `run` has been rolled into `io::process`
9022 * std: `assert_eq!` now uses `{}` instead of `{:?}`
9023 * std: The equality and comparison traits have seen some reorganization.
9024 * std: `rand` has moved to `librand`.
9025 * std: `to_{lower,upper}case` has been implemented for `char`.
9026 * std: Logging has been moved to `liblog`.
9027 * collections: `HashMap` has been rewritten for higher performance and less
9029 * native: The default runtime is now `libnative`. If `libgreen` is desired,
9030 it can be booted manually. The runtime guide has more information and
9032 * native: All I/O functionality except signals has been implemented.
9033 * green: Task spawning with `libgreen` has been optimized with stack caching
9034 and various trimming of code.
9035 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
9036 * sync: The `extra::sync` module has been updated to modern rust (and moved
9037 to the `sync` library), tweaking and improving various interfaces while
9038 dropping redundant functionality.
9039 * sync: A new `Barrier` type has been added to the `sync` library.
9040 * sync: An efficient mutex for native and green tasks has been implemented.
9041 * serialize: The `base64` module has seen some improvement. It treats
9042 newlines better, has non-string error values, and has seen general
9044 * fourcc: A `fourcc!` macro was introduced
9045 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9046 hexadecimal literal.
9049 * `rustpkg` has been deprecated and removed from the main repository. Its
9050 replacement, `cargo`, is under development.
9051 * Nightly builds of rust are now available
9052 * The memory usage of rustc has been improved many times throughout this
9054 * The build process supports disabling rpath support for the rustc binary
9056 * Code generation has improved in some cases, giving more information to the
9057 LLVM optimization passes to enable more extensive optimizations.
9058 * Debuginfo compatibility with lldb on OSX has been restored.
9059 * The master branch is now gated on an android bot, making building for
9060 android much more reliable.
9061 * Output flags have been centralized into one `--emit` flag.
9062 * Crate type flags have been centralized into one `--crate-type` flag.
9063 * Codegen flags have been consolidated behind a `-C` flag.
9064 * Linking against outdated crates now has improved error messages.
9065 * Error messages with lifetimes will often suggest how to annotate the
9066 function to fix the error.
9067 * Many more types are documented in the standard library, and new guides
9069 * Many `rustdoc` improvements:
9070 * code blocks are syntax highlighted.
9071 * render standalone markdown files.
9072 * the --test flag tests all code blocks by default.
9073 * exported macros are displayed.
9074 * re-exported types have their documentation inlined at the location of the
9076 * search works across crates that have been rendered to the same output
9080 Version 0.9 (2014-01-09)
9081 ==========================
9083 * ~1800 changes, numerous bugfixes
9086 * The `float` type has been removed. Use `f32` or `f64` instead.
9087 * A new facility for enabling experimental features (feature gating) has
9088 been added, using the crate-level `#[feature(foo)]` attribute.
9089 * Managed boxes (@) are now behind a feature gate
9090 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
9091 standard library's `Gc` or `Rc` types instead.
9092 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
9093 * Jumping back to the top of a loop is now done with `continue` instead of
9095 * Strings can no longer be mutated through index assignment.
9096 * Raw strings can be created via the basic `r"foo"` syntax or with matched
9097 hash delimiters, as in `r###"foo"###`.
9098 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
9100 * The `&fn` type is now written `|args| -> ret` to match the literal form.
9101 * `@fn`s have been removed.
9102 * `do` only works with procs in order to make it obvious what the cost
9104 * Single-element tuple-like structs can no longer be dereferenced to
9105 obtain the inner value. A more comprehensive solution for overloading
9106 the dereference operator will be provided in the future.
9107 * The `#[link(...)]` attribute has been replaced with
9108 `#[crate_id = "name#vers"]`.
9109 * Empty `impl`s must be terminated with empty braces and may not be
9110 terminated with a semicolon.
9111 * Keywords are no longer allowed as lifetime names; the `self` lifetime
9112 no longer has any special meaning.
9113 * The old `fmt!` string formatting macro has been removed.
9114 * `printf!` and `printfln!` (old-style formatting) removed in favor of
9115 `print!` and `println!`.
9116 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
9117 * The `extern mod foo (name = "bar")` syntax has been removed. Use
9118 `extern mod foo = "bar"` instead.
9119 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
9120 * Macros can have attributes.
9121 * Macros can expand to items with attributes.
9122 * Macros can expand to multiple items.
9123 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
9124 * Comments may be nested.
9125 * Values automatically coerce to trait objects they implement, without
9127 * Enum discriminants are no longer an entire word but as small as needed to
9128 contain all the variants. The `repr` attribute can be used to override
9129 the discriminant size, as in `#[repr(int)]` for integer-sized, and
9130 `#[repr(C)]` to match C enums.
9131 * Non-string literals are not allowed in attributes (they never worked).
9132 * The FFI now supports variadic functions.
9133 * Octal numeric literals, as in `0o7777`.
9134 * The `concat!` syntax extension performs compile-time string concatenation.
9135 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
9136 removed as Rust no longer uses segmented stacks.
9137 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
9138 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
9139 not `*`; ignoring remaining fields of a struct is also done with `..`,
9140 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
9141 * `rustc` supports the "win64" calling convention via `extern "win64"`.
9142 * `rustc` supports the "system" calling convention, which defaults to the
9143 preferred convention for the target platform, "stdcall" on 32-bit Windows,
9145 * The `type_overflow` lint (default: warn) checks literals for overflow.
9146 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
9147 * The `attribute_usage` lint (default: warn) warns about unknown
9149 * The `unknown_features` lint (default: warn) warns about unknown
9151 * The `dead_code` lint (default: warn) checks for dead code.
9152 * Rust libraries can be linked statically to one another
9153 * `#[link_args]` is behind the `link_args` feature gate.
9154 * Native libraries are now linked with `#[link(name = "foo")]`
9155 * Native libraries can be statically linked to a rust crate
9156 (`#[link(name = "foo", kind = "static")]`).
9157 * Native OS X frameworks are now officially supported
9158 (`#[link(name = "foo", kind = "framework")]`).
9159 * The `#[thread_local]` attribute creates thread-local (not task-local)
9160 variables. Currently behind the `thread_local` feature gate.
9161 * The `return` keyword may be used in closures.
9162 * Types that can be copied via a memcpy implement the `Pod` kind.
9163 * The `cfg` attribute can now be used on struct fields and enum variants.
9166 * std: The `option` and `result` API's have been overhauled to make them
9167 simpler, more consistent, and more composable.
9168 * std: The entire `std::io` module has been replaced with one that is
9169 more comprehensive and that properly interfaces with the underlying
9170 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
9172 * std: `io::util` contains a number of useful implementations of
9173 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
9174 `ZeroReader`, `TeeReader`.
9175 * std: The reference counted pointer type `extra::rc` moved into std.
9176 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
9177 just a wrapper around it).
9178 * std: The `Either` type has been removed.
9179 * std: `fmt::Default` can be implemented for any type to provide default
9180 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
9181 * std: The `rand` API continues to be tweaked.
9182 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
9183 on failure in gdb, is now named `rust_fail`.
9184 * std: The `each_key` and `each_value` methods on `HashMap` have been
9185 replaced by the `keys` and `values` iterators.
9186 * std: Functions dealing with type size and alignment have moved from the
9187 `sys` module to the `mem` module.
9188 * std: The `path` module was written and API changed.
9189 * std: `str::from_utf8` has been changed to cast instead of allocate.
9190 * std: `starts_with` and `ends_with` methods added to vectors via the
9191 `ImmutableEqVector` trait, which is in the prelude.
9192 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
9193 if the index is out of bounds.
9194 * std: Task failure no longer propagates between tasks, as the model was
9195 complex, expensive, and incompatible with thread-based tasks.
9196 * std: The `Any` type can be used for dynamic typing.
9197 * std: `~Any` can be passed to the `fail!` macro and retrieved via
9199 * std: Methods that produce iterators generally do not have an `_iter`
9201 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
9202 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
9203 * std: `util::ignore` renamed to `prelude::drop`.
9204 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
9206 * std: `vec::raw` has seen a lot of cleanup and API changes.
9207 * std: The standard library no longer includes any C++ code, and very
9208 minimal C, eliminating the dependency on libstdc++.
9209 * std: Runtime scheduling and I/O functionality has been factored out into
9210 extensible interfaces and is now implemented by two different crates:
9211 libnative, for native threading and I/O; and libgreen, for green threading
9212 and I/O. This paves the way for using the standard library in more limited
9213 embedded environments.
9214 * std: The `comm` module has been rewritten to be much faster, have a
9215 simpler, more consistent API, and to work for both native and green
9217 * std: All libuv dependencies have been moved into the rustuv crate.
9218 * native: New implementations of runtime scheduling on top of OS threads.
9219 * native: New native implementations of TCP, UDP, file I/O, process spawning,
9221 * green: The green thread scheduler and message passing types are almost
9223 * extra: The `flatpipes` module had bitrotted and was removed.
9224 * extra: All crypto functions have been removed and Rust now has a policy of
9225 not reimplementing crypto in the standard library. In the future crypto
9226 will be provided by external crates with bindings to established libraries.
9227 * extra: `c_vec` has been modernized.
9228 * extra: The `sort` module has been removed. Use the `sort` method on
9232 * The `rust` and `rusti` commands have been removed, due to lack of
9234 * `rustdoc` was completely rewritten.
9235 * `rustdoc` can test code examples in documentation.
9236 * `rustpkg` can test packages with the argument, 'test'.
9237 * `rustpkg` supports arbitrary dependencies, including C libraries.
9238 * `rustc`'s support for generating debug info is improved again.
9239 * `rustc` has better error reporting for unbalanced delimiters.
9240 * `rustc`'s JIT support was removed due to bitrot.
9241 * Executables and static libraries can be built with LTO (-Z lto)
9242 * `rustc` adds a `--dep-info` flag for communicating dependencies to
9246 Version 0.8 (2013-09-26)
9247 ============================
9249 * ~2200 changes, numerous bugfixes
9252 * The `for` loop syntax has changed to work with the `Iterator` trait.
9253 * At long last, unwinding works on Windows.
9254 * Default methods are ready for use.
9255 * Many trait inheritance bugs fixed.
9256 * Owned and borrowed trait objects work more reliably.
9257 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
9258 * rustc can omit emission of code for the `debug!` macro if it is passed
9260 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
9261 for foo.rs, then foo/mod.rs, and will generate an error when both are
9263 * Strings no longer contain trailing nulls. The new `std::c_str` module
9264 provides new mechanisms for converting to C strings.
9265 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
9266 * The FFI has been overhauled such that foreign functions are called directly,
9267 instead of through a stack-switching wrapper.
9268 * Calling a foreign function must be done through a Rust function with the
9269 `#[fixed_stack_segment]` attribute.
9270 * The `externfn!` macro can be used to declare both a foreign function and
9271 a `#[fixed_stack_segment]` wrapper at once.
9272 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
9273 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
9274 * `priv` is disallowed everywhere except for struct fields and enum variants.
9275 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
9276 * `ref` bindings in irrefutable patterns work correctly now.
9277 * `char` is now prevented from containing invalid code points.
9278 * Casting to `bool` is no longer allowed.
9279 * `\0` is now accepted as an escape in chars and strings.
9280 * `yield` is a reserved keyword.
9281 * `typeof` is a reserved keyword.
9282 * Crates may be imported by URL with `extern mod foo = "url";`.
9283 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
9284 * Static vectors can be initialized with repeating elements,
9285 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
9286 * Static structs can be initialized with functional record update,
9287 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
9288 * `cfg!` can be used to conditionally execute code based on the crate
9289 configuration, similarly to `#[cfg(...)]`.
9290 * The `unnecessary_qualification` lint detects unneeded module
9291 prefixes (default: allow).
9292 * Arithmetic operations have been implemented on the SIMD types in
9293 `std::unstable::simd`.
9294 * Exchange allocation headers were removed, reducing memory usage.
9295 * `format!` implements a completely new, extensible, and higher-performance
9296 string formatting system. It will replace `fmt!`.
9297 * `print!` and `println!` write formatted strings (using the `format!`
9298 extension) to stdout.
9299 * `write!` and `writeln!` write formatted strings (using the `format!`
9300 extension) to the new Writers in `std::rt::io`.
9301 * The library section in which a function or static is placed may
9302 be specified with `#[link_section = "..."]`.
9303 * The `proto!` syntax extension for defining bounded message protocols
9305 * `macro_rules!` is hygienic for `let` declarations.
9306 * The `#[export_name]` attribute specifies the name of a symbol.
9307 * `unreachable!` can be used to indicate unreachable code, and fails
9311 * std: Transitioned to the new runtime, written in Rust.
9312 * std: Added an experimental I/O library, `rt::io`, based on the new
9314 * std: A new generic `range` function was added to the prelude, replacing
9315 `uint::range` and friends.
9316 * std: `range_rev` no longer exists. Since range is an iterator it can be
9317 reversed with `range(lo, hi).invert()`.
9318 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
9319 renamed to `unwrap_or`.
9320 * std: The `iterator` module was renamed to `iter`.
9321 * std: Integral types now support the `checked_add`, `checked_sub`, and
9322 `checked_mul` operations for detecting overflow.
9323 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
9325 * std: Methods are standardizing on conventions for casting methods:
9326 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9328 * std: The `CString` type in `c_str` provides new ways to convert to and
9330 * std: `DoubleEndedIterator` can yield elements in two directions.
9331 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9333 * std: `str::from_bytes` renamed to `str::from_utf8`.
9334 * std: `pop_opt` and `shift_opt` methods added to vectors.
9335 * std: The task-local data interface no longer uses @, and keys are
9336 no longer function pointers.
9337 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
9338 * std: Added `SharedPort` to `comm`.
9339 * std: `Eq` has a default method for `ne`; only `eq` is required
9341 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
9342 is required in implementations.
9343 * std: `is_utf8` performance is improved, impacting many string functions.
9344 * std: `os::MemoryMap` provides cross-platform mmap.
9345 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
9346 are not 'in-bounds' are considered undefined.
9347 * std: Many freestanding functions in `vec` removed in favor of methods.
9348 * std: Many freestanding functions on scalar types removed in favor of
9350 * std: Many options to task builders were removed since they don't make
9351 sense in the new scheduler design.
9352 * std: More containers implement `FromIterator` so can be created by the
9354 * std: More complete atomic types in `unstable::atomics`.
9355 * std: `comm::PortSet` removed.
9356 * std: Mutating methods in the `Set` and `Map` traits have been moved into
9357 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
9358 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
9359 default implementations.
9360 * std: Various `from_str` functions were removed in favor of a generic
9361 `from_str` which is available in the prelude.
9362 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
9363 * extra: `dlist`, the doubly-linked list was modernized.
9364 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
9365 * extra: Added `glob` module, replacing `std::os::glob`.
9366 * extra: `rope` was removed.
9367 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
9368 * extra: `net`, and `timer` were removed. The experimental replacements
9369 are `std::rt::io::net` and `std::rt::io::timer`.
9370 * extra: Iterators implemented for `SmallIntMap`.
9371 * extra: Iterators implemented for `Bitv` and `BitvSet`.
9372 * extra: `SmallIntSet` removed. Use `BitvSet`.
9373 * extra: Performance of JSON parsing greatly improved.
9374 * extra: `semver` updated to SemVer 2.0.0.
9375 * extra: `term` handles more terminals correctly.
9376 * extra: `dbg` module removed.
9377 * extra: `par` module removed.
9378 * extra: `future` was cleaned up, with some method renames.
9379 * extra: Most free functions in `getopts` were converted to methods.
9382 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
9383 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
9384 similarly to gcc's `--march` flag.
9385 * rustc's performance compiling small crates is much better.
9386 * rustpkg has received many improvements.
9387 * rustpkg supports git tags as package IDs.
9388 * rustpkg builds into target-specific directories so it can be used for
9390 * The number of concurrent test tasks is controlled by the environment
9391 variable RUST_TEST_TASKS.
9392 * The test harness can now report metrics for benchmarks.
9393 * All tools have man pages.
9394 * Programs compiled with `--test` now support the `-h` and `--help` flags.
9395 * The runtime uses jemalloc for allocations.
9396 * Segmented stacks are temporarily disabled as part of the transition to
9397 the new runtime. Stack overflows are possible!
9398 * A new documentation backend, rustdoc_ng, is available for use. It is
9399 still invoked through the normal `rustdoc` command.
9402 Version 0.7 (2013-07-03)
9403 =======================
9405 * ~2000 changes, numerous bugfixes
9408 * `impl`s no longer accept a visibility qualifier. Put them on methods
9410 * The borrow checker has been rewritten with flow-sensitivity, fixing
9411 many bugs and inconveniences.
9412 * The `self` parameter no longer implicitly means `&'self self`,
9413 and can be explicitly marked with a lifetime.
9414 * Overloadable compound operators (`+=`, etc.) have been temporarily
9415 removed due to bugs.
9416 * The `for` loop protocol now requires `for`-iterators to return `bool`
9417 so they compose better.
9418 * The `Durable` trait is replaced with the `'static` bounds.
9419 * Trait default methods work more often.
9420 * Structs with the `#[packed]` attribute have byte alignment and
9421 no padding between fields.
9422 * Type parameters bound by `Copy` must now be copied explicitly with
9424 * It is now illegal to move out of a dereferenced unsafe pointer.
9425 * `Option<~T>` is now represented as a nullable pointer.
9426 * `@mut` does dynamic borrow checks correctly.
9427 * The `main` function is only detected at the topmost level of the crate.
9428 The `#[main]` attribute is still valid anywhere.
9429 * Struct fields may no longer be mutable. Use inherited mutability.
9430 * The `#[no_send]` attribute makes a type that would otherwise be
9432 * The `#[no_freeze]` attribute makes a type that would otherwise be
9434 * Unbounded recursion will abort the process after reaching the limit
9435 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9436 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9437 are never implicitly copyable.
9438 * `#[static_assert]` makes compile-time assertions about static bools.
9439 * At long last, 'argument modes' no longer exist.
9440 * The rarely used `use mod` statement no longer exists.
9443 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9445 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9446 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9448 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9449 and unsuffixed integer literals.
9452 * The `core` crate was renamed to `std`.
9453 * The `std` crate was renamed to `extra`.
9454 * More and improved documentation.
9455 * std: `iterator` module for external iterator objects.
9456 * Many old-style (internal, higher-order function) iterators replaced by
9457 implementations of `Iterator`.
9458 * std: Many old internal vector and string iterators,
9459 incl. `any`, `all`. removed.
9460 * std: The `finalize` method of `Drop` renamed to `drop`.
9461 * std: The `drop` method now takes `&mut self` instead of `&self`.
9462 * std: The prelude no longer re-exports any modules, only types and traits.
9463 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9464 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9465 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9466 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9467 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9468 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9469 * std: Many types implement `Clone`.
9470 * std: `path` type renamed to `Path`.
9471 * std: `mut` module and `Mut` type removed.
9472 * std: Many standalone functions removed in favor of methods and iterators
9473 in `vec`, `str`. In the future methods will also work as functions.
9474 * std: `reinterpret_cast` removed. Use `transmute`.
9475 * std: ascii string handling in `std::ascii`.
9476 * std: `Rand` is implemented for ~/@.
9477 * std: `run` module for spawning processes overhauled.
9478 * std: Various atomic types added to `unstable::atomic`.
9479 * std: Various types implement `Zero`.
9480 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9481 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9482 * std: Added `os::mkdir_recursive`.
9483 * std: Added `os::glob` function performs filesystems globs.
9484 * std: `FuzzyEq` renamed to `ApproxEq`.
9485 * std: `Map` now defines `pop` and `swap` methods.
9486 * std: `Cell` constructors converted to static methods.
9487 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9488 * extra: `flate` module moved from `std` to `extra`.
9489 * extra: `fileinput` module for iterating over a series of files.
9490 * extra: `Complex` number type and `complex` module.
9491 * extra: `Rational` number type and `rational` module.
9492 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9493 * extra: `term` uses terminfo now, is more correct.
9494 * extra: `arc` functions converted to methods.
9495 * extra: Implementation of fixed output size variations of SHA-2.
9498 * `unused_variables` lint mode for unused variables (default: warn).
9499 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9501 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9503 * `dead_assignment` lint mode for unread variables (default: warn).
9504 * `unnecessary_allocation` lint mode detects some heap allocations that are
9505 immediately borrowed so could be written without allocating (default: warn).
9506 * `missing_doc` lint mode (default: allow).
9507 * `unreachable_code` lint mode (default: warn).
9508 * The `rusti` command has been rewritten and a number of bugs addressed.
9509 * rustc outputs in color on more terminals.
9510 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9511 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9512 * Compiling with `-g` will make the binary record information about
9513 dynamic borrowcheck failures for debugging.
9514 * rustdoc has a nicer stylesheet.
9515 * Various improvements to rustdoc.
9516 * Improvements to rustpkg (see the detailed release notes).
9519 Version 0.6 (2013-04-03)
9520 ========================
9522 * ~2100 changes, numerous bugfixes
9525 * The self type parameter in traits is now spelled `Self`
9526 * The `self` parameter in trait and impl methods must now be explicitly
9527 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9528 * Static methods no longer require the `static` keyword and instead
9529 are distinguished by the lack of a `self` parameter
9530 * Replaced the `Durable` trait with the `'static` lifetime
9531 * The old closure type syntax with the trailing sigil has been
9532 removed in favor of the more consistent leading sigil
9533 * `super` is a keyword, and may be prefixed to paths
9534 * Trait bounds are separated with `+` instead of whitespace
9535 * Traits are implemented with `impl Trait for Type`
9536 instead of `impl Type: Trait`
9537 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9538 * The `export` keyword has finally been removed
9539 * The `move` keyword has been removed (see "Semantic changes")
9540 * The interior mutability qualifier on vectors, `[mut T]`, has been
9541 removed. Use `&mut [T]`, etc.
9542 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9543 * `fail` is no longer a keyword. Use `fail!()`
9544 * `assert` is no longer a keyword. Use `assert!()`
9545 * `log` is no longer a keyword. use `debug!`, etc.
9546 * 1-tuples may be represented as `(T,)`
9547 * Struct fields may no longer be `mut`. Use inherited mutability,
9548 `@mut T`, `core::mut` or `core::cell`
9549 * `extern mod { ... }` is no longer valid syntax for foreign
9550 function modules. Use extern blocks: `extern { ... }`
9551 * Newtype enums removed. Use tuple-structs.
9552 * Trait implementations no longer support visibility modifiers
9553 * Pattern matching over vectors improved and expanded
9554 * `const` renamed to `static` to correspond to lifetime name,
9555 and make room for future `static mut` unsafe mutable globals.
9556 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9557 * `Clone` implementations can be automatically generated with
9558 `#[deriving(Clone)]`
9559 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9560 instead of `foo as Bar`.
9561 * Fixed length vector types are now written as `[int, .. 3]`
9562 instead of `[int * 3]`.
9563 * Fixed length vector types can express the length as a constant
9564 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9567 * Types with owned pointers or custom destructors move by default,
9568 eliminating the `move` keyword
9569 * All foreign functions are considered unsafe
9570 * &mut is now unaliasable
9571 * Writes to borrowed @mut pointers are prevented dynamically
9573 * The name of the main function can be customized using #[main]
9574 * The default type of an inferred closure is &fn instead of @fn
9575 * `use` statements may no longer be "chained" - they cannot import
9576 identifiers imported by previous `use` statements
9577 * `use` statements are crate relative, importing from the "top"
9578 of the crate by default. Paths may be prefixed with `super::`
9579 or `self::` to change the search behavior.
9580 * Method visibility is inherited from the implementation declaration
9581 * Structural records have been removed
9582 * Many more types can be used in static items, including enums
9583 'static-lifetime pointers and vectors
9584 * Pattern matching over vectors improved and expanded
9585 * Typechecking of closure types has been overhauled to
9586 improve inference and eliminate unsoundness
9587 * Macros leave scope at the end of modules, unless that module is
9588 tagged with #[macro_escape]
9591 * Added big integers to `std::bigint`
9592 * Removed `core::oldcomm` module
9593 * Added pipe-based `core::comm` module
9594 * Numeric traits have been reorganized under `core::num`
9595 * `vec::slice` finally returns a slice
9596 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9597 * Containers reorganized around traits in `core::container`
9598 * `core::dvec` removed, `~[T]` is a drop-in replacement
9599 * `core::send_map` renamed to `core::hashmap`
9600 * `std::map` removed; replaced with `core::hashmap`
9601 * `std::treemap` reimplemented as an owned balanced tree
9602 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9603 * `core::trie` added as a fast ordered map for integer keys
9604 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9605 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9606 overload the comparison operators, whereas `TotalOrd` is used
9607 by certain container types
9610 * Replaced the 'cargo' package manager with 'rustpkg'
9611 * Added all-purpose 'rust' tool
9612 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9613 * rustc now *attempts* to offer spelling suggestions
9614 * Improved support for ARM and Android
9615 * Preliminary MIPS backend
9616 * Improved foreign function ABI implementation for x86, x86_64
9617 * Various memory usage improvements
9618 * Rust code may be embedded in foreign code under limited circumstances
9619 * Inline assembler supported by new asm!() syntax extension.
9622 Version 0.5 (2012-12-21)
9623 ===========================
9625 * ~900 changes, numerous bugfixes
9628 * Removed `<-` move operator
9629 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9630 * Removed old fixed length vector syntax - `[T]/N`
9631 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9632 * Macros may now expand to items and statements
9633 * `a.b()` is always parsed as a method call, never as a field projection
9634 * `Eq` and `IterBytes` implementations can be automatically generated
9635 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9636 * Removed the special crate language for `.rc` files
9637 * Function arguments may consist of any irrefutable pattern
9640 * `&` and `~` pointers may point to objects
9641 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9642 * Enum variants may be structs
9643 * Destructors can be added to all nominal types with the Drop trait
9644 * Structs and nullary enum variants may be constants
9645 * Values that cannot be implicitly copied are now automatically moved
9646 without writing `move` explicitly
9647 * `&T` may now be coerced to `*T`
9648 * Coercions happen in `let` statements as well as function calls
9649 * `use` statements now take crate-relative paths
9650 * The module and type namespaces have been merged so that static
9651 method names can be resolved under the trait in which they are
9654 * Improved support for language features
9655 * Trait inheritance works in many scenarios
9656 * More support for explicit self arguments in methods - `self`, `&self`
9657 `@self`, and `~self` all generally work as expected
9658 * Static methods work in more situations
9659 * Experimental: Traits may declare default methods for the implementations
9663 * New condition handling system in `core::condition`
9664 * Timsort added to `std::sort`
9665 * New priority queue, `std::priority_queue`
9666 * Pipes for serializable types, `std::flatpipes'
9667 * Serialization overhauled to be trait-based
9668 * Expanded `getopts` definitions
9669 * Moved futures to `std`
9670 * More functions are pure now
9671 * `core::comm` renamed to `oldcomm`. Still deprecated
9672 * `rustdoc` and `cargo` are libraries now
9675 * Added a preliminary REPL, `rusti`
9676 * License changed from MIT to dual MIT/APL2
9679 Version 0.4 (2012-10-15)
9680 ==========================
9682 * ~2000 changes, numerous bugfixes
9685 * All keywords are now strict and may not be used as identifiers anywhere
9686 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9687 'of', 'with', 'to', 'class'.
9688 * Classes are replaced with simpler structs
9689 * Explicit method self types
9690 * `ret` became `return` and `alt` became `match`
9691 * `import` is now `use`; `use is now `extern mod`
9692 * `extern mod { ... }` is now `extern { ... }`
9693 * `use mod` is the recommended way to import modules
9694 * `pub` and `priv` replace deprecated export lists
9695 * The syntax of `match` pattern arms now uses fat arrow (=>)
9696 * `main` no longer accepts an args vector; use `os::args` instead
9699 * Trait implementations are now coherent, ala Haskell typeclasses
9700 * Trait methods may be static
9701 * Argument modes are deprecated
9702 * Borrowed pointers are much more mature and recommended for use
9703 * Strings and vectors in the static region are stored in constant memory
9704 * Typestate was removed
9705 * Resolution rewritten to be more reliable
9706 * Support for 'dual-mode' data structures (freezing and thawing)
9709 * Most binary operators can now be overloaded via the traits in
9711 * `std::net::url` for representing URLs
9712 * Sendable hash maps in `core::send_map`
9713 * `core::task' gained a (currently unsafe) task-local storage API
9716 * An efficient new intertask communication primitive called the pipe,
9717 along with a number of higher-level channel types, in `core::pipes`
9718 * `std::arc`, an atomically reference counted, immutable, shared memory
9720 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9721 * Futures are now based on pipes and sendable
9722 * More robust linked task failure
9723 * Improved task builder API
9726 * Improved error reporting
9727 * Preliminary JIT support
9728 * Preliminary work on precise GC
9729 * Extensive architectural improvements to rustc
9730 * Begun a transition away from buggy C++-based reflection (shape) code to
9731 Rust-based (visitor) code
9732 * All hash functions and tables converted to secure, randomized SipHash
9735 Version 0.3 (2012-07-12)
9736 ========================
9738 * ~1900 changes, numerous bugfixes
9740 * New coding conveniences
9741 * Integer-literal suffix inference
9742 * Per-item control over warnings, errors
9743 * #[cfg(windows)] and #[cfg(unix)] attributes
9744 * Documentation comments
9745 * More compact closure syntax
9746 * 'do' expressions for treating higher-order functions as
9748 * *-patterns (wildcard extended to all constructor fields)
9751 * Name resolution pass and exhaustiveness checker rewritten
9752 * Region pointers and borrow checking supersede alias
9754 * Init-ness checking is now provided by a region-based liveness
9755 pass instead of the typestate pass; same for last-use analysis
9756 * Extensive work on region pointers
9758 * Experimental new language features
9759 * Slices and fixed-size, interior-allocated vectors
9760 * #!-comments for lang versioning, shell execution
9761 * Destructors and iface implementation for classes;
9762 type-parameterized classes and class methods
9763 * 'const' type kind for types that can be used to implement
9764 shared-memory concurrency patterns
9768 * Removal of various obsolete features
9769 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9770 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9772 * Constructs: do-while loops ('do' repurposed), fn binding,
9773 resources (replaced by destructors)
9775 * Compiler reorganization
9776 * Syntax-layer of compiler split into separate crate
9777 * Clang (from LLVM project) integrated into build
9778 * Typechecker split into sub-modules
9781 * New time functions
9782 * Extension methods for many built-in types
9783 * Arc: atomic-refcount read-only / exclusive-use shared cells
9784 * Par: parallel map and search routines
9785 * Extensive work on libuv interface
9786 * Much vector code moved to libraries
9787 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9788 #include, #include_str, #include_bin
9791 * Cargo automatically resolves dependencies
9794 Version 0.2 (2012-03-29)
9795 =========================
9797 * >1500 changes, numerous bugfixes
9799 * New docs and doc tooling
9801 * New port: FreeBSD x86_64
9803 * Compilation model enhancements
9804 * Generics now specialized, multiply instantiated
9805 * Functions now inlined across separate crates
9807 * Scheduling, stack and threading fixes
9808 * Noticeably improved message-passing performance
9809 * Explicit schedulers
9813 * Experimental new language features
9814 * Operator overloading
9818 * Various language extensions
9819 * C-callback function types: 'crust fn ...'
9820 * Infinite-loop construct: 'loop { ... }'
9821 * Shorten 'mutable' to 'mut'
9822 * Required mutable-local qualifier: 'let mut ...'
9823 * Basic glob-exporting: 'export foo::*;'
9824 * Alt now exhaustive, 'alt check' for runtime-checked
9825 * Block-function form of 'for' loop, with 'break' and 'ret'.
9828 * AST quasi-quote syntax extension
9829 * Revived libuv interface
9830 * New modules: core::{future, iter}, std::arena
9831 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9832 * Extensive cleanup, regularization in libstd, libcore
9835 Version 0.1 (2012-01-20)
9836 ===============================
9838 * Most language features work, including:
9839 * Unique pointers, unique closures, move semantics
9840 * Interface-constrained generics
9841 * Static interface dispatch
9843 * Multithread task scheduling
9844 * Typestate predicates
9845 * Failure unwinding, destructors
9846 * Pattern matching and destructuring assignment
9847 * Lightweight block-lambda syntax
9848 * Preliminary macro-by-example
9850 * Compiler works with the following configurations:
9851 * Linux: x86 and x86_64 hosts and targets
9852 * macOS: x86 and x86_64 hosts and targets
9853 * Windows: x86 hosts and targets
9855 * Cross compilation / multi-target configuration supported.
9857 * Preliminary API-documentation and package-management tools included.
9861 * Documentation is incomplete.
9863 * Performance is below intended target.
9865 * Standard library APIs are subject to extensive change, reorganization.
9867 * Language-level versioning is not yet operational - future code will