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1Version 1.51.0 (2021-03-25)
2============================
3
4Language
5--------
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.
10 ```rust
11 struct GenericArray<T, const LENGTH: usize> {
12 inner: [T; LENGTH]
13 }
14
15 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
16 const fn last(&self) -> Option<&T> {
17 if LENGTH == 0 {
18 None
19 } else {
20 Some(&self.inner[LENGTH - 1])
21 }
22 }
23 }
24 ```
25
26
27Compiler
28--------
29
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]
38
39\* Refer to Rust's [platform support page][forge-platform-support] for more
40information on Rust's tiered platform support.
41
42Libraries
43---------
44
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]
54
55Stabilized APIs
56---------------
57
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`]
64- [`array::IntoIter`]
65- [`panic::panic_any`]
66- [`ptr::addr_of!`]
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`]
74- [`sync::OnceState`]
75- [`task::Wake`]
76
77Cargo
78-----
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.
87
88Rustdoc
89-------
90
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]
94
95Various improvements to intra-doc links:
96
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]
100
101Misc
102----
103- [You can now pass `--include-ignored` to tests (e.g. with
104 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
105
106Compatibility Notes
107-------------------
108
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
111 could fail.][80579]
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`
119
120Internal Only
121-------------
122
123- [Consistently avoid constructing optimized MIR when not doing codegen][80718]
124
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
171
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172Version 1.50.0 (2021-02-11)
173============================
174
175Language
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]
180
181Compiler
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]
186
187\* Refer to Rust's [platform support page][forge-platform-support] for more
188information on Rust's tiered platform support.
189
190Libraries
191-----------------------
192
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`.
198
199Stabilized APIs
200---------------
201
202- [`bool::then`]
203- [`btree_map::Entry::or_insert_with_key`]
204- [`f32::clamp`]
205- [`f64::clamp`]
206- [`hash_map::Entry::or_insert_with_key`]
207- [`Ord::clamp`]
208- [`RefCell::take`]
209- [`slice::fill`]
210- [`UnsafeCell::get_mut`]
211
212The following previously stable methods are now `const`.
213
214- [`IpAddr::is_ipv4`]
215- [`IpAddr::is_ipv6`]
216- [`Layout::size`]
217- [`Layout::align`]
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.
225
226Cargo
227-----------------------
228
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]
234
235Misc
236----
237
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]
240
241Compatibility Notes
242-------------------
243
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]
255
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
290
291
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292Version 1.49.0 (2020-12-31)
293============================
294
295Language
296-----------------------
297
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.
303 ```rust
304 #[derive(Debug)]
305 struct Person {
306 name: String,
307 age: u8,
308 }
309
310 let person = Person {
311 name: String::from("Alice"),
312 age: 20,
313 };
314
315 // `name` is moved out of person, but `age` is referenced.
316 let Person { name, ref age } = person;
317 println!("{} {}", name, age);
318 ```
319
320Compiler
321-----------------------
322
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]
330
331\* Refer to Rust's [platform support page][forge-platform-support] for more
332information on Rust's tiered platform support.
333
334Libraries
335-----------------------
336
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]
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339
340Stabilized APIs
341---------------
342
343- [`slice::select_nth_unstable`]
344- [`slice::select_nth_unstable_by`]
345- [`slice::select_nth_unstable_by_key`]
346
347The following previously stable methods are now `const`.
348
349- [`Poll::is_ready`]
350- [`Poll::is_pending`]
351
352Cargo
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]
360
361
362Compatibility Notes
363-------------------
364
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]
372
373Internal Only
374-------------
375These changes provide no direct user facing benefits, but represent significant
376improvements to the internals and overall performance of rustc and
377related tools.
378
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]
384
385
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
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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
417
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418Version 1.48.0 (2020-11-19)
419==========================
420
421Language
422--------
423
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.
426
427Compiler
428--------
429- [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
b9856134 430 `rustc` whether to link its own C runtime and libraries or to rely on a external
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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]
435
436\* Refer to Rust's [platform support page][forge-platform-support] for more
437information on Rust's tiered platform support.
438
439Libraries
440---------
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]
447
448Stabilized APIs
449---------------
450- [`slice::as_ptr_range`]
451- [`slice::as_mut_ptr_range`]
452- [`VecDeque::make_contiguous`]
453- [`future::pending`]
454- [`future::ready`]
455
456The following previously stable methods are now `const fn`'s:
457
458- [`Option::is_some`]
459- [`Option::is_none`]
460- [`Option::as_ref`]
461- [`Result::is_ok`]
462- [`Result::is_err`]
463- [`Result::as_ref`]
464- [`Ordering::reverse`]
465- [`Ordering::then`]
466
467Cargo
468-----
469
470Rustdoc
471-------
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]
478
479Compatibility Notes
480-------------------
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.
b9856134 502
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503
504
505Internal Only
506-------------
507These changes provide no direct user facing benefits, but represent significant
508improvements to the internals and overall performance of rustc and
509related tools.
510
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
513 your `config.toml`.
514- [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
515- [Made `ensure_sufficient_stack()` non-generic][76680]
516
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/
b9856134 522[54121]: https://github.com/rust-lang/rust/issues/54121/
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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
556
557
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558Version 1.47.0 (2020-10-08)
559==========================
560
561Language
562--------
563- [Closures will now warn when not used.][74869]
564
565Compiler
566--------
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
569 platforms.
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]
574
575\* Refer to Rust's [platform support page][forge-platform-support] for more
576information on Rust's tiered platform support.
577
578Libraries
579---------
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]
586
587Stabilized APIs
588---------------
589- [`Ident::new_raw`]
590- [`Range::is_empty`]
591- [`RangeInclusive::is_empty`]
592- [`Result::as_deref`]
593- [`Result::as_deref_mut`]
594- [`Vec::leak`]
595- [`pointer::offset_from`]
596- [`f32::TAU`]
597- [`f64::TAU`]
598
599The following previously stable APIs have now been made const.
600
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]
611
612Cargo
613-----
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`.
616 ```toml
617 [profile.release.build-override]
618 opt-level = 3
619 ```
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]
627
628Misc
629----
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]
633
634Compatibility Notes
635-------------------
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
641 `Delimiter::None`.
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]
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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`.)
647
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648Internal Only
649--------
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650
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.
1b1a35ee 652
6c58768f 653[1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
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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
692
693
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694Version 1.46.0 (2020-08-27)
695==========================
696
697Language
698--------
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`.
6c58768f 706- [`mem::transmute` can now be used in statics and constants.][72920] **Note**
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707 You currently can't use `mem::transmute` in constant functions.
708
709Compiler
710--------
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]
714
715Libraries
716---------
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]
727
728Stabilized APIs
729---------------
730- [`Option::zip`]
731- [`vec::Drain::as_slice`]
732
733Cargo
734-----
735Added a number of new environment variables that are now available when
736compiling your crate.
737
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.
742
743Compatibility Notes
744-------------------
745- [The target configuration option `abi_blacklist` has been renamed
746 to `unsupported_abis`.][74150] The old name will still continue to work.
6c58768f 747- [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
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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
751 allowed on `enum`s.
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
768 under QEMU.][74820]
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.
773
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
805
806
807Version 1.45.2 (2020-08-03)
808==========================
809
810* [Fix bindings in tuple struct patterns][74954]
811* [Fix track_caller integration with trait objects][74784]
812
813[74954]: https://github.com/rust-lang/rust/issues/74954
814[74784]: https://github.com/rust-lang/rust/issues/74784
815
816
817Version 1.45.1 (2020-07-30)
818==========================
819
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]
824
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
829
830
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831Version 1.45.0 (2020-07-16)
832==========================
833
834Language
835--------
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
841 using `u64`.][70705]
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.
845
846Compiler
847--------
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]
2a314972 858- [Upgraded to LLVM 10.][67759]
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859
860\* Refer to Rust's [platform support page][forge-platform-support] for more
861information on Rust's tiered platform support.
862
863
864Libraries
865---------
866- [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
867 and `Ord`.][72239]
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;
873 ```rust
874 for ch in 'a'..='z' {
875 print!("{}", ch);
876 }
877 println!();
878 // Prints "abcdefghijklmnopqrstuvwxyz"
879 ```
880- [`OsString` now implements `FromStr`.][71662]
f9652781 881- [The `saturating_neg` method has been added to all signed integer primitive
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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`,
886 or `Path`.][71447]
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]
893
894Stabilized APIs
895---------------
896- [`Arc::as_ptr`]
897- [`BTreeMap::remove_entry`]
898- [`Rc::as_ptr`]
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`]
912
913Cargo
914-----
915
f9652781
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916- [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
917 time.][cargo/8066]
918
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919Misc
920----
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]
924
925Compatibility Notes
926-------------------
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.
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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.
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939
940Internals Only
941--------------
942- [Make clippy a git subtree instead of a git submodule][70655]
943- [Unify the undo log of all snapshot types][69464]
944
f9652781 945[71848]: https://github.com/rust-lang/rust/issues/71848/
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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/
2a314972 958[67759]: https://github.com/rust-lang/rust/pull/67759/
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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/
f9652781 973[cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
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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
990
991
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992Version 1.44.1 (2020-06-18)
993===========================
994
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]
999
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
1004
f9f354fc 1005
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1006Version 1.44.0 (2020-06-04)
1007==========================
1008
1009Language
1010--------
1011- [You can now use `async/.await` with `#[no_std]` enabled.][69033]
1012- [Added the `unused_braces` lint.][70081]
1013
1014**Syntax-only changes**
1015
1016- [Expansion-driven outline module parsing][69838]
1017```rust
1018#[cfg(FALSE)]
1019mod foo {
1020 mod bar {
1021 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
1022 }
1023}
1024```
1025
1026These are still rejected semantically, so you will likely receive an error but
1027these changes can be seen and parsed by macros and conditional compilation.
1028
1029Compiler
1030--------
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.
f9f354fc 1033- [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
ba9703b0
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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]
1039
1040
1041Libraries
1042---------
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]
f9f354fc 1051- [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
ba9703b0
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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]
1056
1057Stabilized APIs
1058---------------
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`]
1069- [`Layout::array`]
1070- [`Layout::extend`]
1071
1072Cargo
1073-----
1074- [Added the `cargo tree` command which will print a tree graph of
1075 your dependencies.][cargo/8062] E.g.
1076 ```
1077 mdbook v0.3.2 (/Users/src/rust/mdbook)
1078 ├── ammonia v3.0.0
1079 │ ├── html5ever v0.24.0
1080 │ │ ├── log v0.4.8
1081 │ │ │ └── cfg-if v0.1.9
1082 │ │ ├── mac v0.1.1
1083 │ │ └── markup5ever v0.9.0
1084 │ │ ├── log v0.4.8 (*)
1085 │ │ ├── phf v0.7.24
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
1091 ...
1092 ```
1093 You can also display dependencies on multiple versions of the same crate with
1094 `cargo tree -d` (short for `cargo tree --duplicates`).
1095
1096Misc
1097----
1098- [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
1099 the version in the sidebar.][69494]
1100
1101Compatibility Notes
1102-------------------
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]
f9f354fc 1108 **Note:** this may not point to a file that actually exists on the user's system.
ba9703b0
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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
f9f354fc
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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
ba9703b0
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1117 sensitive situations.
1118
1119Internal Only
1120-------------
1121These changes provide no direct user facing benefits, but represent significant
1122improvements to the internals and overall performance of rustc and
1123related tools.
1124
1125- [dep_graph Avoid allocating a set on when the number reads are small.][69778]
1126- [Replace big JS dict with JSON parsing.][71250]
1127
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
1166
1167
1168Version 1.43.1 (2020-05-07)
1169===========================
1170
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]
1174
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
1178
1179
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1180Version 1.43.0 (2020-04-23)
1181==========================
1182
1183Language
1184--------
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]
1188
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:
ba9703b0 1196 ```rust
74b04a01
XL
1197 macro_rules! mac_trait {
1198 ($i:item) => {
1199 trait T { $i }
1200 }
1201 }
1202 mac_trait! {
1203 fn foo() {}
1204 }
1205 ```
1206
1207These are still rejected *semantically*, so you will likely receive an error but
1208these changes can be seen and parsed by macros and
1209conditional compilation.
1210
1211
1212Compiler
1213--------
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]
1223
1224Libraries
1225---------
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`
1229 is `0..=32`.
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]
1240
1241Stabilized APIs
1242---------------
1243- [`Once::is_completed`]
1244- [`f32::LOG10_2`]
1245- [`f32::LOG2_10`]
1246- [`f64::LOG10_2`]
1247- [`f64::LOG2_10`]
1248- [`iter::once_with`]
1249
1250Cargo
1251-----
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")`.
1258
1259Misc
1260----
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.
ba9703b0 1264
74b04a01
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1265Compatibility Notes
1266-------------------
1267
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.
1272
1273[69340]: https://github.com/rust-lang/rust/pull/69340
1274
1275Internal Only
1276-------------
1277These changes provide no direct user facing benefits, but represent significant
1278improvements to the internals and overall performance of `rustc` and
1279related tools.
1280
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]
1290
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
1327
1328
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1329Version 1.42.0 (2020-03-12)
1330==========================
1331
1332Language
1333--------
1334- [You can now use the slice pattern syntax with subslices.][67712] e.g.
1335 ```rust
1336 fn foo(words: &[&str]) {
1337 match words {
1338 ["Hello", "World", "!", ..] => println!("Hello World!"),
1339 ["Foo", "Bar", ..] => println!("Baz"),
1340 rest => println!("{:?}", rest),
1341 }
1342 }
1343 ```
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
1346 it contains.
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.
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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.
1359
1360Compiler
1361--------
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]
1368
1369\* Refer to Rust's [platform support page][forge-platform-support] for more
1370information on Rust's tiered platform support.
1371
1372Libraries
1373---------
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]
1380
1381
1382Stabilized APIs
1383---------------
1384- [`CondVar::wait_while`]
1385- [`CondVar::wait_timeout_while`]
1386- [`DebugMap::key`]
1387- [`DebugMap::value`]
1388- [`ManuallyDrop::take`]
1389- [`matches!`]
1390- [`ptr::slice_from_raw_parts_mut`]
1391- [`ptr::slice_from_raw_parts`]
1392
1393Cargo
1394-----
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]
1397
1398Compatibility Notes
1399-------------------
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.
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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
1424
1425
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1426Version 1.41.1 (2020-02-27)
1427===========================
1428
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]
1432
1433[69225]: https://github.com/rust-lang/rust/issues/69225
1434[69145]: https://github.com/rust-lang/rust/pull/69145
1435
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1437Version 1.41.0 (2020-01-30)
1438===========================
1439
1440Language
1441--------
1442
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.
1453
1454Compiler
1455--------
1456
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
1463 more information.
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]
1466
1467\* Refer to Rust's [platform support page][forge-platform-support] for more
1468information on Rust's tiered platform support.
1469
1470[argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1471
1472Libraries
1473---------
1474
1475- [The `core::panic` module is now stable.][66771] It was already stable
1476 through `std`.
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]
1480
1481Stabilized APIs
1482---------------
1483
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`]
1490
1491Cargo
1492-----
1493
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
1504 their dependencies.
1505
1506Misc
1507----
1508
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]
1515
1516Compatibility Notes
1517-------------------
1518
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.
1524
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
1551
1552Version 1.40.0 (2019-12-19)
1553===========================
1554
1555Language
1556--------
1557- [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1558 `const` contexts.][65188] e.g.
1559
1560 ```rust
1561 pub struct Point(i32, i32);
1562
1563 const ORIGIN: Point = {
1564 let constructor = Point;
1565
1566 constructor(0, 0)
1567 };
1568 ```
1569
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)]`.
1581
1582Compiler
1583--------
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]
1590
1591\* Refer to Rust's [platform support page][forge-platform-support] for more
1592 information on Rust's tiered platform support.
1593
1594Libraries
1595---------
1596- [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1597
1598Stabilized APIs
1599---------------
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`]
1618- [`mem::take`]
1619- [`slice::repeat`]
1620- [`todo!`]
1621
1622Cargo
1623-----
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]
1630
1631Misc
1632----
1633- [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1634 when running documentation tests with `rustdoc`.][63803]
1635
1636Compatibility Notes
1637-------------------
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.
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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
1687
1688
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1689Version 1.39.0 (2019-11-07)
1690===========================
1691
1692Language
1693--------
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.
1700 ```rust
1701 fn len(
1702 #[cfg(windows)] slice: &[u16],
1703 #[cfg(not(windows))] slice: &[u8],
1704 ) -> usize {
1705 slice.len()
1706 }
1707 ```
1708- [You can now take shared references to bind-by-move patterns in the `if` guards
1709 of `match` arms.][63118] e.g.
1710 ```rust
1711 fn main() {
1712 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1713
1714 match array {
1715 nums
1716 // ---- `nums` is bound by move.
1717 if nums.iter().sum::<u8>() == 10
1718 // ^------ `.iter()` implicitly takes a reference to `nums`.
1719 => {
1720 drop(nums);
1721 // ----------- Legal as `nums` was bound by move and so we have ownership.
1722 }
1723 _ => unreachable!(),
1724 }
1725 }
1726 ```
1727
1728
1729
1730Compiler
1731--------
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]
1739
1740
1741\* Refer to Rust's [platform support page][forge-platform-support] for more
1742information on Rust's tiered platform support.
1743
1744Libraries
1745---------
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]
1751
1752Stabilized APIs
1753---------------
1754- [`Pin::into_inner`]
1755- [`Instant::checked_duration_since`]
1756- [`Instant::saturating_duration_since`]
1757
1758Cargo
1759-----
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.
1763
1764Misc
1765----
1766- [You can now pass `-Clinker` to rustdoc to control the linker used
1767 for compiling doctests.][63834]
1768
1769Compatibility Notes
1770-------------------
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
1777 amount of doctests.
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
1781 returned `0.0`.
1782
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
1812
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1813Version 1.38.0 (2019-09-26)
1814==========================
1815
1816Language
1817--------
1818- [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1819- [The `#[deprecated]` attribute can now be used on macros.][62042]
1820
1821Compiler
1822--------
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]
2a314972 1833- [Upgraded to LLVM 9.][62592]
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1834
1835\* Refer to Rust's [platform support page][forge-platform-support] for more
1836information on Rust's tiered platform support.
1837
1838Libraries
1839---------
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
1852 integer primitives.
1853- [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1854 `PartialEq`.][61491]
1855- [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1856
1857Stabilized APIs
1858---------------
1859- [`<*const T>::cast`]
1860- [`<*mut T>::cast`]
1861- [`Duration::as_secs_f32`]
1862- [`Duration::as_secs_f64`]
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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`]
1870
1871Cargo
1872-----
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]
1876
1877Misc
1878----
1879- [`rustc` will now warn about some incorrect uses of
1880 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1881
1882Compatibility Notes
1883-------------------
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1884- The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1885 1.38.0.
1886- The [`armv7-unknown-linux-gnueabihf` platform is known to have
1887 issues][62896] with certain crates such as libc.
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1888
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/
2a314972 1900[62592]: https://github.com/rust-lang/rust/pull/62592/
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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
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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
f9f354fc 1922[forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
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1923[pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1924
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1925Version 1.37.0 (2019-08-15)
1926==========================
1927
1928Language
1929--------
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:
1936 ```rust
1937 type MyOption = Option<u8>;
1938
1939 fn increment_or_zero(x: MyOption) -> u8 {
1940 match x {
1941 MyOption::Some(y) => y + 1,
1942 MyOption::None => 0,
1943 }
1944 }
1945 ```
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]
416331ca 1949- [The `?` Kleene macro operator is now available in the
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1950 2015 edition.][60932]
1951
1952Compiler
1953--------
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]
1958
1959Libraries
1960---------
1961- [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1962
1963Stabilized APIs
1964---------------
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`]
1970- [`Option::xor`]
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`]
1985
1986Cargo
1987-----
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]
1992
1993Misc
1994----
1995
1996Compatibility Notes
1997-------------------
1998- [Using `...` for inclusive range patterns will now warn by default.][61342]
1999 Please transition your code to using the `..=` syntax for inclusive
2000 ranges instead.
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.
2003
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
2041
2042
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2043Version 1.36.0 (2019-07-04)
2044==========================
2045
2046Language
2047--------
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.
2052
2053Libraries
2054---------
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
2069 not used.][59648]
2070
2071Stabilized APIs
2072---------------
2073- [`VecDeque::rotate_left`]
2074- [`VecDeque::rotate_right`]
2075- [`Iterator::copied`]
2076- [`io::IoSlice`]
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`]
2084- [`task::Context`]
2085- [`task::RawWaker`]
2086- [`task::RawWakerVTable`]
2087- [`task::Waker`]
2088- [`task::Poll`]
2089
2090Cargo
2091-----
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]
2094
2095You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
2096
2097Clippy
2098------
2099There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
2100
2101Misc
2102----
2103
2104Compatibility Notes
2105-------------------
48663c56 2106- With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
416331ca 2107 longer recommended, and will be deprecated in 1.39.0.
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2108
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
416331ca 2142
48663c56 2143
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2144Version 1.35.0 (2019-05-23)
2145==========================
2146
2147Language
2148--------
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.
2152 ```rust
2153 unsafe fn call_unsafe(func: unsafe fn()) {
2154 func()
2155 }
2156
2157 pub fn main() {
2158 unsafe { call_unsafe(|| {}); }
2159 }
2160 ```
2161
2162
2163Compiler
2164--------
2165- [Added the `armv6-unknown-freebsd-gnueabihf` and
2166 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
2167- [Added the `wasm32-unknown-wasi` target.][59464]
2168
2169
2170Libraries
2171---------
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
2176 last field.][59076]
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`
2187 and `Send`.][58369]
2188
2189Stabilized APIs
2190---------------
2191- [`f32::copysign`]
2192- [`f64::copysign`]
2193- [`RefCell::replace_with`]
2194- [`RefCell::map_split`]
2195- [`ptr::hash`]
2196- [`Range::contains`]
2197- [`RangeFrom::contains`]
2198- [`RangeTo::contains`]
2199- [`RangeInclusive::contains`]
2200- [`RangeToInclusive::contains`]
2201- [`Option::copied`]
2202
2203Cargo
2204-----
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
2207 platform specific.
48663c56 2208
532ac7d7
XL
2209Misc
2210----
2211- [The Rust toolchain is now available natively for musl based distros.][58575]
2212
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
2240
9fa01778
XL
2241Version 1.34.2 (2019-05-14)
2242===========================
2243
2244* [Destabilize the `Error::type_id` function due to a security
532ac7d7 2245 vulnerability][60785] ([CVE-2019-12083])
9fa01778
XL
2246
2247[60785]: https://github.com/rust-lang/rust/pull/60785
532ac7d7 2248[CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
9fa01778
XL
2249
2250Version 1.34.1 (2019-04-25)
2251===========================
2252
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]
2256
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
2260
2261Version 1.34.0 (2019-04-11)
2262==========================
2263
2264Language
2265--------
2266- [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
2267 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
2268 but had no effect.
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.
2273
2274
2275Compiler
2276--------
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
2282 boundaries.
2283- [You can now target `powerpc64-unknown-freebsd`.][57809]
2284
2285
2286Libraries
2287---------
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
2293 an iterator.
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
dc9dc135 2303 equivalent to methods such as `wrapping_add` for the `pow` operation.
9fa01778
XL
2304
2305
2306Stabilized APIs
2307---------------
2308
2309#### std & core
2310* [`Any::type_id`]
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`]
2323* [`iter::from_fn`]
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`]
2336
2337#### std
2338* [`Instant::checked_add`]
2339* [`Instant::checked_sub`]
2340* [`SystemTime::checked_add`]
2341* [`SystemTime::checked_sub`]
2342
2343Cargo
2344-----
2345- [You can now use alternative registries to crates.io.][cargo/6654]
2346
2347Misc
2348----
2349- [You can now use the `?` operator in your documentation tests without manually
2350 adding `fn main() -> Result<(), _> {}`.][56470]
2351
2352Compatibility Notes
2353-------------------
dc9dc135
XL
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
9fa01778
XL
2357 can now use `const` functions in `static` variables.
2358
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
2405
2406
0731742a
XL
2407Version 1.33.0 (2019-02-28)
2408==========================
2409
2410Language
2411--------
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`
2419 expression. E.g.
2420 ```rust
2421 enum Creature {
2422 Crab(String),
2423 Lobster(String),
2424 Person(String),
2425 }
2426
2427 fn main() {
2428 let state = Creature::Crab("Ferris");
2429
2430 if let Creature::Crab(name) | Creature::Person(name) = state {
2431 println!("This creature's name is: {}", name);
2432 }
2433 }
2434 ```
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.
2441 ```rust
2442 const unsafe fn foo() -> i32 { 5 }
2443 const fn bar() -> i32 {
2444 unsafe { foo() }
2445 }
2446 ```
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.
2454 ```rust
2455 use std::io::Read as _;
2456
2457 // Allowed as there is only one `Read` in the module.
2458 pub trait Read {}
2459 ```
2460- [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2461
2462Compiler
2463--------
2464- [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2465 command line argument.][56351]
416331ca 2466- [The minimum required LLVM version has been bumped to 6.0.][56642]
0731742a
XL
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]
2474
2475Libraries
2476---------
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]
2488
2489Stabilized APIs
2490---------------
2491- [`unix::FileExt::read_exact_at`]
2492- [`unix::FileExt::write_all_at`]
2493- [`Option::transpose`]
2494- [`Result::transpose`]
2495- [`convert::identity`]
2496- [`pin::Pin`]
2497- [`marker::Unpin`]
2498- [`marker::PhantomPinned`]
2499- [`Vec::resize_with`]
2500- [`VecDeque::resize_with`]
2501- [`Duration::as_millis`]
2502- [`Duration::as_micros`]
2503- [`Duration::as_nanos`]
2504
2505
2506Cargo
2507-----
9fa01778
XL
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]
0731742a
XL
2510- [Cargo should now rebuild a crate if a file was modified during the initial
2511 build.][cargo/6484]
2512
2513Compatibility Notes
2514-------------------
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}`
2518 methods instead.
2519- The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2520 downcasting.
9fa01778
XL
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]
0731742a
XL
2523
2524[55982]: https://github.com/rust-lang/rust/pull/55982/
9fa01778 2525[56243]: https://github.com/rust-lang/rust/pull/56243
0731742a
XL
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/
9fa01778 2546[cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
0731742a
XL
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
2562
69743fb6
XL
2563Version 1.32.0 (2019-01-17)
2564==========================
2565
2566Language
2567--------
2568#### 2018 edition
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
2571 `+` operators.
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]
2575 E.g.
2576 ```rust
2577 enum Color { Red, Green, Blue }
2578
2579 use Color::*;
2580 ```
2581
2582#### All editions
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"`
0731742a 2587- [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
69743fb6
XL
2588 ```rust
2589 struct Point(i32, i32);
2590
2591 impl Point {
2592 pub fn new(x: i32, y: i32) -> Self {
2593 Self(x, y)
2594 }
2595
2596 pub fn is_origin(&self) -> bool {
2597 match self {
2598 Self(0, 0) => true,
2599 _ => false,
2600 }
2601 }
2602 }
2603 ```
2604- [Self can also now be used in type definitions.][56366] E.g.
2605 ```rust
2606 enum List<T>
2607 where
2608 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2609 {
2610 Nil,
2611 Cons(T, Box<Self>) // likewise here
2612 }
2613 ```
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.
2616
2617Compiler
2618--------
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]
2623
2624Libraries
2625---------
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.
2630 ```rust
2631 let a = 2;
2632 let b = dbg!(a * 2) + 1;
2633 // ^-- prints: [src/main.rs:4] a * 2 = 4
2634 assert_eq!(b, 5);
2635 ```
2636
2637The following APIs are now `const` functions and can be used in a
2638`const` context.
2639
2640- [`Cell::as_ptr`]
2641- [`UnsafeCell::get`]
2642- [`char::is_ascii`]
2643- [`iter::empty`]
2644- [`ManuallyDrop::new`]
2645- [`ManuallyDrop::into_inner`]
2646- [`RangeInclusive::start`]
2647- [`RangeInclusive::end`]
2648- [`NonNull::as_ptr`]
2649- [`slice::as_ptr`]
2650- [`str::as_ptr`]
2651- [`Duration::as_secs`]
2652- [`Duration::subsec_millis`]
2653- [`Duration::subsec_micros`]
2654- [`Duration::subsec_nanos`]
2655- [`CStr::as_ptr`]
2656- [`Ipv4Addr::is_unspecified`]
2657- [`Ipv6Addr::new`]
2658- [`Ipv6Addr::octets`]
2659
2660Stabilized APIs
2661---------------
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`]
2734
2735Cargo
2736-----
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]
2739
2740Misc
2741----
2742- [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2743
2744Compatibility Notes
2745-------------------
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
2749 was unsound.
2750
2751
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
2859
2860
2861Version 1.31.1 (2018-12-20)
2862===========================
2863
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]
2867
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
2871
13cf67c4
XL
2872Version 1.31.0 (2018-12-06)
2873==========================
2874
2875Language
2876--------
0731742a 2877- 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
13cf67c4
XL
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
2881 in structs.
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]
2890
2891Compiler
2892--------
2893- [Updated musl to 1.1.20][54430]
2894
2895Libraries
2896---------
416331ca 2897- [You can now convert `num::NonZero*` types to their raw equivalents using the
13cf67c4
XL
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]
2902
2903
2904Stabilized APIs
2905---------------
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`]
2915
2916Cargo
2917-----
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]
2921
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
2947
2948Version 1.30.1 (2018-11-08)
2949===========================
2950
2951- [Fixed overflow ICE in rustdoc][54199]
2952- [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2953
2954[54199]: https://github.com/rust-lang/rust/pull/54199
2955[cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2956
4462d4a0
XL
2957Version 1.30.0 (2018-10-25)
2958==========================
2959
2960Language
2961--------
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
2983 those macros.
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]
2991
2992Compiler
2993--------
2994- [Added the `riscv32imc-unknown-none-elf` target.][53822]
2995- [Added the `aarch64-unknown-netbsd` target][53165]
2a314972 2996- [Upgraded to LLVM 8.][53611]
4462d4a0
XL
2997
2998Libraries
2999---------
3000- [`ManuallyDrop` now allows the inner type to be unsized.][53033]
3001
3002Stabilized APIs
3003---------------
3004- [`Ipv4Addr::BROADCAST`]
3005- [`Ipv4Addr::LOCALHOST`]
3006- [`Ipv4Addr::UNSPECIFIED`]
3007- [`Ipv6Addr::LOCALHOST`]
3008- [`Ipv6Addr::UNSPECIFIED`]
3009- [`Iterator::find_map`]
3010
3011 The following methods are replacement methods for `trim_left`, `trim_right`,
3012 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
3013 in 1.33.0:
3014- [`str::trim_end_matches`]
3015- [`str::trim_end`]
3016- [`str::trim_start_matches`]
3017- [`str::trim_start`]
3018
3019Cargo
3020----
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`.
4462d4a0
XL
3024- [Cargo will now provide a progress bar for builds.][cargo/5995]
3025
3026Misc
3027----
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.
3036
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/
2a314972 3045[53611]: https://github.com/rust-lang/rust/pull/53611/
4462d4a0
XL
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/
4462d4a0 3058[cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
a1dfa0c6 3059[proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4462d4a0
XL
3060
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
3071
3072
3073Version 1.29.2 (2018-10-11)
3074===========================
3075
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.
3078
3079[54639]: https://github.com/rust-lang/rust/pull/54639
3080
3081
3082Version 1.29.1 (2018-09-25)
3083===========================
3084
3085Security Notes
3086--------------
3087
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.
3091
416331ca 3092 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4462d4a0
XL
3093 us.
3094
3095
8faf50e0
XL
3096Version 1.29.0 (2018-09-13)
3097==========================
3098
3099Compiler
3100--------
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]
2a314972 3104- [Upgraded to LLVM 7.][51966]
8faf50e0
XL
3105
3106Libraries
3107---------
4462d4a0 3108- [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
8faf50e0
XL
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>`
3112 for `&str`.][51178]
3113- [`Cell<T>` now allows `T` to be unsized.][50494]
3114- [`SocketAddr` is now stable on Redox.][52656]
3115
3116Stabilized APIs
3117---------------
3118- [`Arc::downcast`]
3119- [`Iterator::flatten`]
3120- [`Rc::downcast`]
3121
3122Cargo
3123-----
4462d4a0
XL
3124- [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
3125 `--locked` to disable this behavior.
8faf50e0 3126- [`cargo-install` will now allow you to cross compile an install
4462d4a0 3127 using `--target`.][cargo/5614]
8faf50e0
XL
3128- [Added the `cargo-fix` subcommand to automatically move project code from
3129 2015 edition to 2018.][cargo/5723]
b7449926
XL
3130- [`cargo doc` can now optionally document private types using the
3131 `--document-private-items` flag.][cargo/5543]
8faf50e0
XL
3132
3133Misc
3134----
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
4462d4a0 3139 fails and `101` if there is a panic.][52197]
8faf50e0 3140- [A preview of clippy has been made available through rustup.][51122]
4462d4a0 3141 You can install the preview with `rustup component add clippy-preview`.
8faf50e0
XL
3142
3143Compatibility Notes
3144-------------------
3145- [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
3146 Use `str::get_unchecked(begin..end)` instead.
4462d4a0 3147- [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
8faf50e0
XL
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]
4462d4a0
XL
3151- [`cfg` attributes and `--cfg` command line flags are now more
3152 strictly validated.][53893]
8faf50e0 3153
4462d4a0 3154[53893]: https://github.com/rust-lang/rust/pull/53893/
8faf50e0 3155[52861]: https://github.com/rust-lang/rust/pull/52861/
2a314972 3156[51966]: https://github.com/rust-lang/rust/pull/51966/
8faf50e0
XL
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/
b7449926 3173[cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
8faf50e0
XL
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
3180
3181
94b46f34 3182Version 1.28.0 (2018-08-02)
5d61e2ac
XL
3183===========================
3184
94b46f34
XL
3185Language
3186--------
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
3194 their program.
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.
3199
3200Compiler
3201--------
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
3205 smaller binary.
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%.
3212
3213Libraries
3214---------
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]
3231
3232Stabilized APIs
3233---------------
3234- [`Iterator::step_by`]
3235- [`Path::ancestors`]
74d20737
XL
3236- [`SystemTime::UNIX_EPOCH`]
3237- [`alloc::GlobalAlloc`]
3238- [`alloc::Layout`]
3239- [`alloc::LayoutErr`]
3240- [`alloc::System`]
3241- [`alloc::alloc`]
3242- [`alloc::alloc_zeroed`]
3243- [`alloc::dealloc`]
3244- [`alloc::realloc`]
3245- [`alloc::handle_alloc_error`]
94b46f34
XL
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`]
3263
3264Cargo
3265-----
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.
3269
3270Misc
3271----
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.
3275
5d61e2ac
XL
3276Compatibility Notes
3277-------------------
8faf50e0
XL
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.
94b46f34
XL
3281 ```rust
3282 trait Trait {}
3283
3284 impl Trait + Send {
3285 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
3286 }
5d61e2ac 3287
94b46f34
XL
3288 impl Trait + Send + Send {
3289 fn test(&self) { println!("two"); }
3290 }
3291 ```
5d61e2ac 3292
94b46f34
XL
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
74d20737
XL
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
94b46f34
XL
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
8faf50e0 3328[`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
94b46f34
XL
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
5d61e2ac 3343
8faf50e0
XL
3344Version 1.27.2 (2018-07-20)
3345===========================
3346
3347Compatibility Notes
3348-------------------
3349
3350- The borrow checker was fixed to avoid potential unsoundness when using
3351 match ergonomics: [#52213][52213].
3352
3353[52213]: https://github.com/rust-lang/rust/issues/52213
3354
83c7162d
XL
3355Version 1.27.1 (2018-07-10)
3356===========================
3357
3358Security Notes
3359--------------
3360
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
94b46f34 3364 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
83c7162d 3365
416331ca 3366 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
83c7162d
XL
3367
3368Compatibility Notes
3369-------------------
3370
3371- The borrow checker was fixed to avoid an additional potential unsoundness when using
3372 match ergonomics: [#51415][51415], [#49534][49534].
3373
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
94b46f34 3377[CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
83c7162d
XL
3378
3379Version 1.27.0 (2018-06-21)
3380==========================
3381
3382Language
3383--------
3384- [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
8faf50e0 3385 be used as an identifier.
83c7162d
XL
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
4462d4a0 3388 `impl Trait` because it is equivalent to the following syntax:
83c7162d
XL
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.
3397
3398Compiler
3399--------
b7449926 3400- [Added the `armv5te-unknown-linux-musleabi` target.][50423]
83c7162d
XL
3401
3402Libraries
3403---------
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
3412 to `Self`.][49630]
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.
3418
3419Stabilized APIs
3420---------------
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`]
3431- [`NonNull::cast`]
3432- [`Option::filter`]
3433- [`String::replace_range`]
3434- [`Take::set_limit`]
3435- [`hint::unreachable_unchecked`]
3436- [`os::unix::process::parent_id`]
83c7162d
XL
3437- [`ptr::swap_nonoverlapping`]
3438- [`slice::rsplit_mut`]
3439- [`slice::rsplit`]
3440- [`slice::swap_with_slice`]
3441
3442Cargo
3443-----
3444- [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3445 `readme`, and `repository` fields.][cargo/5386]
94b46f34 3446- [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
83c7162d
XL
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
4462d4a0 3451 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
83c7162d 3452 where cargo would infer a binary, Cargo will produce a warning. You can
4462d4a0
XL
3453 disable this feature ahead of time by setting any of the following to false:
3454 `autobins`, `autobenches`, `autoexamples`, `autotests`.
83c7162d
XL
3455- [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3456 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3457
3458Misc
3459----
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]
3463
3464Compatibility Notes
3465-------------------
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}`
4462d4a0
XL
3470 will only print the inner type.][48553] E.g.
3471 `print!("{:?}", AtomicBool::new(true))` will print `true`,
83c7162d
XL
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.
b7449926
XL
3476- The `.description()` method on the `std::error::Error` trait
3477 [has been soft-deprecated][50163]. It is no longer required to implement it.
83c7162d
XL
3478
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/
b7449926 3491[50163]: https://github.com/rust-lang/rust/pull/50163
83c7162d
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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/
94b46f34 3499[cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
83c7162d
XL
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
94b46f34
XL
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
83c7162d
XL
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
83c7162d
XL
3525[“The Rustc book”]: https://doc.rust-lang.org/rustc
3526
3527
2c912e08
XL
3528Version 1.26.2 (2018-06-05)
3529==========================
3530
3531Compatibility Notes
3532-------------------
3533
4462d4a0 3534- [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2c912e08
XL
3535
3536[51117]: https://github.com/rust-lang/rust/issues/51117
3537
83c7162d 3538
564c78a2
XL
3539Version 1.26.1 (2018-05-29)
3540==========================
3541
3542Tools
3543-----
3544
4462d4a0
XL
3545- [RLS now works on Windows.][50646]
3546- [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
564c78a2 3547
94b46f34 3548
564c78a2
XL
3549Compatibility Notes
3550--------
3551
3552- [`fn main() -> impl Trait` no longer works for non-Termination
4462d4a0 3553 trait.][50656]
564c78a2 3554 This reverts an accidental stabilization.
4462d4a0
XL
3555- [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3556- [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
564c78a2
XL
3557
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
3563
3564Version 1.26.0 (2018-05-10)
3565==========================
3566
3567Language
3568--------
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]
4462d4a0 3572- [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
564c78a2
XL
3573 lifetime can be elided.][49458]
3574- [`impl Trait` is now stable allowing you to have abstract types in returns
4462d4a0 3575 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
564c78a2
XL
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,
4462d4a0
XL
3582 and use tuple struct constructors.
3583- [Fixed entry slice patterns are now stable.][48516] E.g.
564c78a2
XL
3584 ```rust
3585 let points = [1, 2, 3, 4];
3586 match points {
3587 [1, 2, 3, 4] => println!("All points were sequential."),
3588 _ => println!("Not all points were sequential."),
3589 }
3590 ```
3591
3592
3593Compiler
3594--------
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]
3601
3602Libraries
3603---------
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]
3613
3614Stabilized APIs
3615---------------
3616- [`*const T::add`]
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`]
3622- [`*const T::sub`]
3623- [`*const T::wrapping_add`]
3624- [`*const T::wrapping_sub`]
3625- [`*mut T::add`]
3626- [`*mut T::copy_to_nonoverlapping`]
3627- [`*mut T::copy_to`]
3628- [`*mut T::read_unaligned`]
3629- [`*mut T::read_volatile`]
3630- [`*mut T::read`]
3631- [`*mut T::replace`]
3632- [`*mut T::sub`]
3633- [`*mut T::swap`]
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`]
3639- [`*mut T::write`]
3640- [`Box::leak`]
3641- [`FromUtf8Error::as_bytes`]
3642- [`LocalKey::try_with`]
3643- [`Option::cloned`]
3644- [`btree_map::Entry::and_modify`]
3645- [`fs::read_to_string`]
3646- [`fs::read`]
3647- [`fs::write`]
3648- [`hash_map::Entry::and_modify`]
3649- [`iter::FusedIterator`]
3650- [`ops::RangeInclusive`]
3651- [`ops::RangeToInclusive`]
3652- [`process::id`]
3653- [`slice::rotate_left`]
3654- [`slice::rotate_right`]
3655- [`String::retain`]
3656
3657
3658Cargo
3659-----
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]
564c78a2
XL
3663
3664Misc
3665----
3666- [The second edition of "The Rust Programming Language" book is now recommended
3667 over the first.][48404]
3668
3669Compatibility Notes
3670-------------------
3671
3672- [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3673 syntax is now invalid.
3674 ```
3675 use std::ops::Fn as dyn;
3676 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3677 ```
3678- [The result of dereferences are no longer promoted to `'static`.][47408]
3679 e.g.
3680 ```rust
3681 fn main() {
3682 const PAIR: &(i32, i32) = &(0, 1);
3683 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3684 }
3685 ```
3686- [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3687- [`".e0"` will now no longer parse as `0.0` and will instead cause
3688 an error.][48235]
3689- [Removed hoedown from rustdoc.][48274]
3690- [Bounds on higher-kinded lifetimes a hard error.][48326]
3691
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
564c78a2
XL
3766
3767
0531ce1d
XL
3768Version 1.25.0 (2018-03-29)
3769==========================
3770
3771Language
3772--------
94b46f34 3773- [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
0531ce1d
XL
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.
3777```rust
3778enum Foo { A, B, C }
3779
3780fn main() {
3781 let x = Foo::A;
3782 match x {
3783 | Foo::A
3784 | Foo::B => println!("AB"),
3785 | Foo::C => println!("C"),
3786 }
3787}
3788```
3789
3790Compiler
3791--------
3792- [Upgraded to LLVM 6.][47828]
3793- [Added `-C lto=val` option.][47521]
3794- [Added `i586-unknown-linux-musl` target][47282]
3795
3796Libraries
3797---------
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]
3806
3807Stabilized APIs
3808---------------
3809- [`Location::column`]
3810- [`ptr::NonNull`]
3811
3812The following functions can now be used in a constant expression.
3813eg. `static MINUTE: Duration = Duration::from_secs(60);`
3814- [`Duration::new`][47300]
3815- [`Duration::from_secs`][47300]
3816- [`Duration::from_millis`][47300]
3817
3818Cargo
3819-----
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]
3823
3824Misc
3825----
3826- [Rust by example is now shipped with new releases][46196]
3827
3828Compatibility Notes
3829-------------------
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]
3836
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
3864
3865
3866Version 1.24.1 (2018-03-01)
3867==========================
3868
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].
3873
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
3878
3879
ff7c6d11
XL
3880Version 1.24.0 (2018-02-15)
3881==========================
3882
3883Language
3884--------
3885- [External `sysv64` ffi is now available.][46528]
3886 eg. `extern "sysv64" fn foo () {}`
3887
3888Compiler
3889--------
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]
3894
3895Libraries
3896---------
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]
0531ce1d 3911- [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
ff7c6d11
XL
3912- [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3913
3914Stabilized APIs
3915---------------
3916- [`RefCell::replace`]
3917- [`RefCell::swap`]
3918- [`atomic::spin_loop_hint`]
3919
3920The following functions can now be used in a constant expression.
3921eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3922
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]
3936
3937Cargo
3938-----
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.
3944
3945Misc
3946----
3947
3948Compatibility Notes
3949-------------------
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]
0531ce1d 3960- [Cargo sets a different working directory for the compiler][cargo/4788]
ff7c6d11
XL
3961
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
0531ce1d 3989[cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
ff7c6d11
XL
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
3994
3995
3996Version 1.23.0 (2018-01-04)
3997==========================
3998
3999Language
4000--------
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.
4004
4005Compiler
4006--------
4007- [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
4462d4a0 4008 undefined behavior.][45920]
ff7c6d11
XL
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]
4015
4016Libraries
4017---------
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`
4029 is now deprecated.
4030
4031Stabilized APIs
4032---------------
4033
4034Cargo
4035-----
ff7c6d11
XL
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]
4041
4042Misc
4043----
4044- [Releases now ship with the Cargo book documentation.][45692]
4045- [rustdoc now prints rendering warnings on every run.][45324]
ff7c6d11
XL
4046
4047Compatibility Notes
4048-------------------
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]
4056
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
ff7c6d11 4079[45920]: https://github.com/rust-lang/rust/pull/45920
ff7c6d11
XL
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
4083
4084
4085Version 1.22.1 (2017-11-22)
4086==========================
4087
4088- [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
4089
4090[46183]: https://github.com/rust-lang/rust/pull/46183
4091
4092Version 1.22.0 (2017-11-22)
abe05a73
XL
4093==========================
4094
4095Language
4096--------
4097- [`non_snake_case` lint now allows extern no-mangle functions][44966]
4098- [Now accepts underscores in unicode escapes][43716]
abe05a73
XL
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]
4101
4102Compiler
4103--------
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]
4109
4110Libraries
4111---------
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.
4121
4122Stabilized APIs
4123---------------
4124
4125Cargo
4126-----
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]
4132
4133Misc
4134----
4135- [`libbacktrace` is now available on Apple platforms.][44251]
ff7c6d11
XL
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.
abe05a73
XL
4138
4139Compatibility Notes
4140-------------------
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]
4145
4146
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
4171
4172
4173
4174
4175
4176
ea8adc8c
XL
4177Version 1.21.0 (2017-10-12)
4178==========================
4179
4180Language
4181--------
ea8adc8c
XL
4182- [You can now use static references for literals.][43838]
4183 Example:
4184 ```rust
4185 fn main() {
4186 let x: &'static u32 = &0;
4187 }
4188 ```
abe05a73
XL
4189- [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
4190 Example:
4191 ```rust
4192 my_macro!(Vec<i32>::new); // Always worked
4193 my_macro!(Vec::<i32>::new); // Now works
4194 ```
ea8adc8c
XL
4195
4196Compiler
4197--------
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.
4202
4203Libraries
4204---------
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]
4210
4211Stabilized APIs
4212---------------
4213
4214[`std::mem::discriminant`]
4215
4216Cargo
4217-----
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]
4228
4229
4230Misc
4231----
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`.
4240
4241Compatibility Notes
4242-------------------
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]
4249
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
4274
3b2f2976
XL
4275Version 1.20.0 (2017-08-31)
4276===========================
4277
4278Language
4279--------
ea8adc8c 4280- [Associated constants are now stabilised.][42809]
3b2f2976
XL
4281- [A lot of macro bugs are now fixed.][42913]
4282
4283Compiler
4284--------
4285
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
4291 it.][43170]
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
4297 applicable][43178]
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]
4301
4302Libraries
4303---------
4304
4305
4306- [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
4307- [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
4308 tuples.][43011]
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
4315 NaN.][42431]
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
4324 previously 2^15.
4325- [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
4326
4327Stabilized APIs
4328---------------
4329
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`]
4340- [`Take::get_mut`]
4341- [`Take::get_ref`]
4342- [`Utf8Error::error_len`]
4343- [`char::EscapeDebug`]
4344- [`char::escape_debug`]
4345- [`compile_error!`]
4346- [`f32::from_bits`]
4347- [`f32::to_bits`]
4348- [`f64::from_bits`]
4349- [`f64::to_bits`]
4350- [`mem::ManuallyDrop`]
4351- [`slice::sort_unstable_by_key`]
4352- [`slice::sort_unstable_by`]
4353- [`slice::sort_unstable`]
ea8adc8c 4354- [`str::from_boxed_utf8_unchecked`]
3b2f2976
XL
4355- [`str::as_bytes_mut`]
4356- [`str::as_bytes_mut`]
4357- [`str::from_utf8_mut`]
4358- [`str::from_utf8_unchecked_mut`]
4359- [`str::get_mut`]
4360- [`str::get_unchecked_mut`]
4361- [`str::get_unchecked`]
4362- [`str::get`]
4363- [`str::into_boxed_bytes`]
4364
4365
4366Cargo
4367-----
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.
4380
4381Compatibility Notes
4382-------------------
4383
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
ea8adc8c 4387 takes the sign of NaN into account where previously didn't.][42430]
3b2f2976
XL
4388
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
ea8adc8c 4447[`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3b2f2976
XL
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
4456
4457
4458Version 1.19.0 (2017-07-20)
4459===========================
4460
4461Language
4462--------
4463
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 };`
4475
4476Compiler
4477--------
4478
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]
4494
4495Libraries
4496---------
4497
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
4504 1.5x faster][41764]
4505- [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4506 macros, but for printing to stderr.
4507
4508Stabilized APIs
4509---------------
4510
4511- [`OsString::shrink_to_fit`]
4512- [`cmp::Reverse`]
4513- [`Command::envs`]
4514- [`thread::ThreadId`]
4515
4516Cargo
4517-----
4518
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]
4539
4540Misc
4541----
4542
4543- [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4544 Windows Debugger.
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 `#`
4550
4551Compatibility Notes
4552-------------------
4553
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
4572 a warning.
4573- [From the pound escape, lines consisting of multiple `#`s are
4574 now visible][41785]
2c00a5a8 4575- [It is an error to re-export private enum variants][42460]. This is
3b2f2976
XL
4576 known to break a number of crates that depend on an older version of
4577 mustache.
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]
4581
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
4640
4641
cc61c64b
XL
4642Version 1.18.0 (2017-06-08)
4643===========================
4644
4645Language
4646--------
4647
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]
4662
4663Compiler
4664--------
4665
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]
4672
4673Libraries
4674---------
4675
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]
4687
4688Stabilized APIs
4689---------------
4690
4691- [`Child::try_wait`]
4692- [`HashMap::retain`]
4693- [`HashSet::retain`]
4694- [`PeekMut::pop`]
4695- [`TcpStream::peek`]
4696- [`UdpSocket::peek`]
4697- [`UdpSocket::peek_from`]
4698
4699Cargo
4700-----
4701
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
4708 binaries.
4709- [Added support for haiku][cargo/3952]
4710
4711Misc
4712----
4713
4714- [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
ff7c6d11 4715- [Added rust-windbg script for better debugging on Windows][39983]
cc61c64b
XL
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]
4719
4720Compatibility Notes
4721-------------------
4722
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:
4740
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
4745 code itself)
4746
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
4790
4791
4792Version 1.17.0 (2017-04-27)
4793===========================
4794
4795Language
4796--------
4797
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]
4808
4809Compiler
4810--------
4811
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
4816 panics][40037]
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]
4827
4828Stabilized APIs
4829---------------
4830
4831* [`Arc::into_raw`]
4832* [`Arc::from_raw`]
4833* [`Arc::ptr_eq`]
4834* [`Rc::into_raw`]
4835* [`Rc::from_raw`]
4836* [`Rc::ptr_eq`]
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`]
4846* [`Cell::swap`]
4847* [`Cell::replace`]
4848* [`Cell::into_inner`]
4849* [`Cell::take`]
4850
4851Libraries
4852---------
4853
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.
4888
4889Cargo
4890-----
4891
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]
4898
4899Misc
4900----
4901
4902* [Documentation is rendered with mdbook instead of the obsolete, in-tree
4903 `rustbook`][39633]
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.
4924
4925Compatibility Notes
4926-------------------
4927
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
4933 fix.
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
4937 to a string.
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
4945 build system.
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
4954 April of 2016.
4955* [rustdoc: fix doctests with non-feature crate attributes][38161]
4956* [Make transmuting from fn item types to pointer-sized types a hard
4957 error][34198]
4958
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/
5048
5049
32a655c1
SL
5050Version 1.16.0 (2017-03-16)
5051===========================
5052
5053Language
5054--------
5055
32a655c1
SL
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]
5062
5063Compiler
5064--------
5065
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
5076 `U`][38670]
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.
5080
5081Stabilized APIs
5082---------------
5083
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`]
5091* [`str::replacen`]
5092* [`str::repeat`]
5093* [`SocketAddr::is_ipv4`]
5094* [`SocketAddr::is_ipv6`]
5095* [`IpAddr::is_ipv4`]
5096* [`IpAddr::is_ipv6`]
5097* [`Vec::dedup_by`]
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`]
5105
5106Libraries
5107---------
5108
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
5115 Windows][38274]
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
5127 `Display`][38909]
5128* [`Duration` implements `Sum`][38712]
5129* [`String` implements `ToSocketAddrs`][39048]
5130
5131Cargo
5132-----
5133
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]
5148
5149Misc
5150----
5151
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
5158 available.
5159* [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
5160 builds available.
5161* [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
5162
5163Compatibility Notes
5164-------------------
5165
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
5172 Windows][38274]
5173* [Clean up semantics of `self` in an import list][38313]
3b2f2976
XL
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].
32a655c1
SL
5177
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
3b2f2976 5211[41105]: https://github.com/rust-lang/rust/issues/41105
32a655c1
SL
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
5242
5243
e81b0574
SL
5244Version 1.15.1 (2017-02-09)
5245===========================
5246
5247* [Fix IntoIter::as_mut_slice's signature][39466]
5248* [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
5249
5250[39466]: https://github.com/rust-lang/rust/pull/39466
5251[39523]: https://github.com/rust-lang/rust/pull/39523
5252
5253
476ff2be
SL
5254Version 1.15.0 (2017-02-02)
5255===========================
5256
5257Language
5258--------
5259
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
5271 bounds][38279]
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]
5276
5277Compiler
5278--------
5279
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]
5290
5291Compiler Performance
5292--------------------
5293
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]
5302
5303Stabilized APIs
5304---------------
5305
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`]
5323
5324Libraries
5325---------
5326
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
5332 performance.
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]
5341
5342Cargo
5343-----
5344
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]
5363
5364Tooling
5365-------
5366
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]
5373
5374Misc
5375----
5376
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
5381 building Rust.
5382* [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
5383 releases.
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
5386 releases.
5387
5388Compatibility Notes
5389-------------------
5390
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
5404 future.
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
5408 future.
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]
5412
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
32a655c1 5424[37627]: https://github.com/rust-lang/rust/pull/37627
476ff2be
SL
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
5494
5495
5496Version 1.14.0 (2016-12-22)
5497===========================
5498
5499Language
5500--------
5501
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]
5508
5509Compiler
5510--------
5511
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]
5520
5521Compile-time Optimizations
5522--------------------------
5523
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]
5540
5541Libraries
5542---------
5543
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
5549 Vec<T>`][37326]
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 /
5554 Extend][37306]
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]
5567
5568Cargo
5569-----
5570
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]
5577
5578Tooling
5579-------
5580
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]
5607
5608Misc
5609----
5610
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]
5614
5615Compatibility Notes
5616-------------------
5617
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]
5639
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
5713
5714
5715Version 1.13.0 (2016-11-10)
5716===========================
5717
5718Language
5719--------
5720
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]
5728
5729Compiler
5730--------
5731
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]
5744
5745Diagnostics
5746-----------
5747
5748* [Replace macro backtraces with labeled local uses][35702]
ff7c6d11 5749* [Improve error message for misplaced doc comments][33922]
476ff2be
SL
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
5756
5757Compile-time Optimizations
5758--------------------------
5759
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]
5769
5770Stabilized APIs
5771---------------
5772
5773* [`checked_abs`]
5774* [`wrapping_abs`]
5775* [`overflowing_abs`]
5776* [`RefCell::try_borrow`]
5777* [`RefCell::try_borrow_mut`]
5778
5779Libraries
5780---------
5781
5782* [Add `assert_ne!` and `debug_assert_ne!`][35074]
5783* [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5784 covariant][35354]
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
5801 `errno`][36754]
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]
5808
5809Cargo
5810-----
5811
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]
5834
5835Tooling
5836-------
5837
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]
5843
5844Misc
5845----
5846
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
5854
5855Compatibility Notes
5856-------------------
5857
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,
5861 per [RFC 401].
5862* [Fix `#[derive]` for empty tuple structs/variants][35728].
5863 Part of [RFC 1506].
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].
5868
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
5970
5971
9e0c209e
SL
5972Version 1.12.1 (2016-10-20)
5973===========================
5974
5975Regression Fixes
5976----------------
5977
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]
5987
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
5997
5998
5bcae85e
SL
5999Version 1.12.0 (2016-09-29)
6000===========================
6001
6002Highlights
6003----------
6004
7cac9316 6005* [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5bcae85e
SL
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
7cac9316 6008 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5bcae85e 6009* [`rustc` presents a new, more readable error format, along with
7cac9316 6010 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5bcae85e 6011 Most common editors supporting Rust have been updated to work with it. It was
7cac9316 6012 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5bcae85e
SL
6013
6014Compiler
6015--------
6016
7cac9316 6017* [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5bcae85e
SL
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
7cac9316 6020 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5bcae85e 6021* [Print the Rust target name, not the LLVM target name, with
7cac9316 6022 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5bcae85e 6023* [The computation of `TypeId` is correct in some cases where it was previously
7cac9316
XL
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)
5bcae85e
SL
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
7cac9316 6029 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5bcae85e 6030* [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7cac9316 6031 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5bcae85e
SL
6032 These targets produce statically-linked binaries. There are no binary release
6033 builds yet though.
6034
6035Diagnostics
6036-----------
6037
6038* [`rustc` presents a new, more readable error format, along with
7cac9316 6039 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5bcae85e 6040 Most common editors supporting Rust have been updated to work with it. It was
7cac9316 6041 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
c30ab7b3 6042* [In error descriptions, references are now described in plain English,
7cac9316 6043 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5bcae85e 6044* [In error type descriptions, unknown numeric types are named `{integer}` or
7cac9316
XL
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)
5bcae85e
SL
6047
6048Language
6049--------
6050
7cac9316
XL
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)
5bcae85e 6053* [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7cac9316 6054 useful](https://github.com/rust-lang/rust/pull/34908)
5bcae85e 6055* [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7cac9316 6056 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
ff7c6d11 6057* [Semicolons are properly required as statement delimiters inside
7cac9316
XL
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)
5bcae85e
SL
6060
6061Stabilized APIs
6062---------------
6063
7cac9316
XL
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).
5bcae85e 6074 Both on Unix and Windows.
7cac9316
XL
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)
5bcae85e
SL
6083
6084Libraries
6085---------
6086
6087* [The `format!` macro and friends now allow a single argument to be formatted
7cac9316 6088 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5bcae85e 6089* [The lifetime bounds on `[T]::binary_search_by` and
7cac9316
XL
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)
5bcae85e 6098* [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7cac9316 6099 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5bcae85e 6100* [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7cac9316
XL
6101 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
6102* [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5bcae85e 6103* [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7cac9316
XL
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)
5bcae85e 6107* [`mpsc::sync_channel` `Receiver`s return any available message before
7cac9316
XL
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)
5bcae85e
SL
6111
6112Cargo
6113-----
6114
7cac9316
XL
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)
5bcae85e
SL
6131
6132Performance
6133-----------
6134
7cac9316
XL
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)
5bcae85e
SL
6137
6138Tooling
6139-------
6140
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
3b2f2976 6143 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7cac9316
XL
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)
5bcae85e 6147* [Rust releases now come with source packages that can be installed by rustup
7cac9316 6148 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5bcae85e
SL
6149 The resulting source code can be used by tools and IDES, located in the
6150 sysroot under `lib/rustlib/src`.
6151
6152Misc
6153----
6154
7cac9316 6155* [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5bcae85e 6156* Many minor improvements to the documentation.
7cac9316 6157* [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5bcae85e
SL
6158
6159Compatibility Notes
6160-------------------
6161
6162* [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7cac9316 6163 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5bcae85e 6164* [When formatting strings, if "precision" is specified, the "fill",
7cac9316
XL
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)
5bcae85e
SL
6167
6168
6169Version 1.11.0 (2016-08-18)
6170===========================
6171
6172Language
6173--------
6174
7cac9316
XL
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)
5bcae85e
SL
6179
6180Stabilized APIs
6181---------------
6182
7cac9316
XL
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)
5bcae85e 6189 (in libcore - previously stabilized in libstd)
7cac9316 6190* [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5bcae85e 6191 (in libcore - previously stabilized in libstd)
7cac9316 6192* [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5bcae85e 6193 (in libcore - previously stabilized in libstd)
7cac9316 6194* [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5bcae85e 6195 (in libcore - previously stabilized in libstd)
7cac9316
XL
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)
5bcae85e
SL
6200
6201Libraries
6202---------
6203
6204* [The `thread_local!` macro supports multiple definitions in a single
7cac9316
XL
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)
5bcae85e 6207* [`Wrapping` implements binary, octal, lower-hex and upper-hex
7cac9316
XL
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 "&lt;main&gt;"](https://github.com/rust-lang/rust/pull/33803)
5bcae85e
SL
6213
6214Cargo
6215-----
6216
7cac9316
XL
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),
5bcae85e 6222 and `-vv` prints warnings for all crates.
7cac9316
XL
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).
5bcae85e 6225 This provides room for expansion by arbitrary tools.
7cac9316
XL
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)
5bcae85e
SL
6233
6234Performance
6235-----------
6236
6237* [Caching projections speeds up type check dramatically for some
7cac9316
XL
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)
5bcae85e
SL
6240 This hasher is faster, but is believed to provide sufficient
6241 protection from collision attacks.
7cac9316 6242* [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5bcae85e
SL
6243
6244Rustdoc
6245-------
6246
7cac9316 6247* [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
2c00a5a8 6248* [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7cac9316
XL
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)
2c00a5a8 6251* [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5bcae85e
SL
6252
6253Tooling
6254-------
6255
7cac9316 6256* [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5bcae85e 6257* [When emitting debug info, rustc emits frame pointers for closures,
7cac9316
XL
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)
5bcae85e
SL
6260* Many more errors have been given error codes and extended
6261 explanations
6262* API documentation continues to be improved, with many new examples
6263
6264Misc
6265----
6266
6267* [rustc no longer hangs when dependencies recursively re-export
7cac9316
XL
6268 submodules](https://github.com/rust-lang/rust/pull/34542)
6269* [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5bcae85e 6270* [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7cac9316
XL
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).
5bcae85e
SL
6273 No targets use this yet, but it works toward AVR support.
6274
6275Compatibility Notes
6276-------------------
6277
7cac9316 6278* [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5bcae85e 6279* [The new follow-set rules that place restrictions on `macro_rules!`
7cac9316 6280 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
ff7c6d11 6281 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5bcae85e 6282 and has been a warning since 1.10.
7cac9316 6283* [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5bcae85e
SL
6284 This causes breakage in some corner cases.
6285
6286
a7813a04
XL
6287Version 1.10.0 (2016-07-07)
6288===========================
6289
6290Language
6291--------
6292
7cac9316 6293* [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
a7813a04 6294 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7cac9316
XL
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).
a7813a04 6297* [`panic!` can be converted to a runtime abort with the
7cac9316 6298 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
a7813a04 6299 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7cac9316 6300* [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
a7813a04 6301 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
8faf50e0 6302 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
a7813a04
XL
6303 Note that Cargo does not yet directly support cdylibs.
6304
6305Stabilized APIs
6306---------------
6307
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`
7cac9316 6314* [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
a7813a04 6315* `Default for sync::Weak`
7cac9316
XL
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)
a7813a04
XL
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}`
7cac9316
XL
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)
a7813a04 6348* Read/Write/RawFd impls for `UnixStream`
7cac9316
XL
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)
a7813a04 6356* RawFd impls for `UnixListener`
7cac9316
XL
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)
a7813a04
XL
6375* RawFd impls for `UnixDatagram`
6376* `{BTree,Hash}Map::values_mut`
74d20737 6377* [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
a7813a04
XL
6378
6379Libraries
6380---------
6381
7cac9316 6382* [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
a7813a04
XL
6383 The semantics of this minor method are subtle and probably not what
6384 most people want.
7cac9316 6385* [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
a7813a04
XL
6386* [On Linux, if `HashMap`s can't be initialized with `getrandom` they
6387 will fall back to `/dev/urandom` temporarily to avoid blocking
7cac9316
XL
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).
a7813a04 6394* [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7cac9316 6395 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
a7813a04
XL
6396
6397Cargo
6398-----
7cac9316 6399* [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
a7813a04
XL
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).
7cac9316
XL
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).
a7813a04 6405* [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7cac9316
XL
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).
a7813a04
XL
6410 By default they are retried twice, which can be customized with the
6411 `net.retry` value in `.cargo/config`.
7cac9316
XL
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).
a7813a04 6416 Makes it possible to install multiple crates in parallel.
7cac9316
XL
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).
a7813a04
XL
6423
6424Performance
6425-----------
6426
6427* [rustc memory usage was reduced by refactoring the context used for
7cac9316 6428 type checking](https://github.com/rust-lang/rust/pull/33425).
a7813a04 6429* [Speed up creation of `HashMap`s by caching the random keys used
7cac9316
XL
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).
a7813a04 6434 10x faster than the previous lookup tables.
7cac9316 6435* [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
a7813a04
XL
6436
6437Usability
6438---------
6439
6440* Many incremental improvements to documentation and rustdoc.
7cac9316
XL
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).
a7813a04
XL
6448
6449Misc
6450----
6451
7cac9316
XL
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).
a7813a04
XL
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
7cac9316 6464 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
a7813a04 6465* [Rust is now bootstrapped from the previous release of Rust,
7cac9316 6466 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
a7813a04
XL
6467
6468Compatibility Notes
6469-------------------
6470
7cac9316 6471* [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
a7813a04 6472* [`target_env` for Linux ARM targets is just `gnu`, not
7cac9316
XL
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).
a7813a04 6477 Affects how macros are parsed.
7cac9316 6478* [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
a7813a04 6479* [Feature-gated attributes on macro-generated macro invocations are
7cac9316
XL
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).
a7813a04
XL
6482 This caused some minor changes to type inference.
6483
6484
54a0048b
SL
6485Version 1.9.0 (2016-05-26)
6486==========================
6487
6488Language
6489--------
6490
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].
6503
6504Stabilized APIs
6505---------------
6506
6507* [`std::panic`]
dfeec247
XL
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`)
54a0048b
SL
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`]
6524* [`BTreeSet::get`]
6525* [`HashSet::take`]
6526* [`HashSet::replace`]
6527* [`HashSet::get`]
6528* [`OsString::with_capacity`]
6529* [`OsString::clear`]
6530* [`OsString::capacity`]
6531* [`OsString::reserve`]
6532* [`OsString::reserve_exact`]
6533* [`OsStr::is_empty`]
6534* [`OsStr::len`]
6535* [`std::os::unix::thread`]
6536* [`RawPthread`]
6537* [`JoinHandleExt`]
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`]
6593
6594Libraries
6595---------
6596
6597* [`std::sync::Once` is poisoned if its initialization function
6598 fails][1.9o].
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].
6610
6611Cargo
6612-----
6613
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.
6623
6624Performance
6625-----------
6626
c30ab7b3 6627* [The time complexity of comparing variables for equivalence during type
a7813a04
XL
6628 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6629 to major compilation time improvement in some scenarios.
54a0048b
SL
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
6633 threads][1.9sp].
6634* [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6635 for C-like enums][1.9cl].
6636
6637Misc
6638----
6639
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.
6645
6646Compatibility Notes
6647-------------------
6648
6649* [`std::sync::Once` is poisoned if its initialization function
6650 fails][1.9o].
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].
6659
6660
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
6771
6772
7453a54e
SL
6773Version 1.8.0 (2016-04-14)
6774==========================
6775
6776Language
6777--------
6778
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`]
6783 traits. [RFC 953].
6784* Empty structs can be defined with braces, as in `struct Foo { }`, in
6785 addition to the non-braced form, `struct Foo;`. [RFC 218].
6786
6787Libraries
6788---------
6789
6790* Stabilized APIs:
dfeec247
XL
6791 * [`str::encode_utf16`] (renamed from `utf16_units`)
6792 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7453a54e
SL
6793 * [`Ref::map`]
6794 * [`RefMut::map`]
6795 * [`ptr::drop_in_place`]
6796 * [`time::Instant`]
6797 * [`time::SystemTime`]
6798 * [`Instant::now`]
dfeec247 6799 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7453a54e
SL
6800 * [`Instant::elapsed`]
6801 * [`SystemTime::now`]
dfeec247 6802 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7453a54e
SL
6803 * [`SystemTime::elapsed`]
6804 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6805 * [`SystemTimeError`]
6806 * [`SystemTimeError::duration`]
6807 * Various impls for `SystemTimeError`
6808 * [`UNIX_EPOCH`]
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`
6821 crate. [RFC 1415].
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].
6829
6830Performance
6831-----------
6832
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].
6840
6841Misc
6842----
6843
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
6848 target][1.8cf].
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].
6862
6863Cargo
6864-----
6865
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
6882 killed][1.8ck].
6883* [The `build.target` configuration value sets the target platform,
6884 like `--target`][1.8ct].
6885
6886Compatibility Notes
6887-------------------
6888
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
a7813a04 6905 blocks, but only within other modules][1.8mf].
7453a54e
SL
6906* [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6907* On Unix, [stack overflow triggers a runtime abort instead of a
6908 SIGSEGV][1.8so].
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
6912 namespace][1.8tn].
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`.
6917
6918
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
a7813a04 6935[1.8mf]: https://github.com/rust-lang/rust/pull/31534
7453a54e
SL
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
6979
6980
9cc50fc6
SL
6981Version 1.7.0 (2016-03-03)
6982==========================
6983
6984Libraries
6985---------
6986
6987* Stabilized APIs
6988 * `Path`
dfeec247
XL
6989 * [`Path::strip_prefix`] (renamed from relative_from)
6990 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
9cc50fc6
SL
6991 * `Ipv4Addr`
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`]
6998 * `Ipv6Addr`
6999 * [`Ipv6Addr::is_unspecified`]
7000 * [`Ipv6Addr::is_loopback`]
7001 * [`Ipv6Addr::is_multicast`]
7002 * `Vec`
7003 * [`Vec::as_slice`]
7004 * [`Vec::as_mut_slice`]
7005 * `String`
7006 * [`String::as_str`]
7007 * [`String::as_mut_str`]
7008 * Slices
7009 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
7010 be the same length
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
7022 * FFI
7023 * [`ffi::IntoStringError`]
7024 * [`CString::into_string`]
7025 * [`CString::into_bytes`]
7026 * [`CString::into_bytes_with_nul`]
7027 * `From<CString> for Vec<u8>`
7028 * `IntoStringError`
7029 * [`IntoStringError::into_cstring`]
7030 * [`IntoStringError::utf8_error`]
7031 * `Error for IntoStringError`
54a0048b
SL
7032 * Hashing
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`]
9cc50fc6
SL
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
7057 searching methods.
7058* [`Any` is implemented for unsized types][1.7a].
7059* [`Hash` is implemented for `Duration`][1.7h].
7060
7061Misc
7062----
7063
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
7069 path explicitly.
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`.
7073
7074Cargo
7075-----
7076
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].
7081
7082Compatibility Notes
7083-------------------
7084
54a0048b
SL
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.
9cc50fc6
SL
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.
54a0048b
SL
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)`.
9cc50fc6
SL
7101* [Borrows of closure parameters may not outlive the closure][1.7bc].
7102
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
54a0048b
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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
9cc50fc6
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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
54a0048b
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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
9cc50fc6
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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
54a0048b 7144[`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
9cc50fc6
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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
54a0048b 7149[`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
9cc50fc6
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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
54a0048b
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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
9cc50fc6
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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
54a0048b 7171[`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
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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
7182
7183
92a42be0
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7184Version 1.6.0 (2016-01-21)
7185==========================
7186
7187Language
7188--------
7189
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.
7197
7198Libraries
7199---------
7200
7201* Stabilized APIs:
9cc50fc6 7202 [`Read::read_exact`],
dfeec247 7203 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
9cc50fc6 7204 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
92a42be0
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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`],
dfeec247 7216 [`Vec::extend_from_slice`] (renamed from `push_all`),
92a42be0 7217 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
9cc50fc6 7218 [`RwLock::into_inner`],
dfeec247
XL
7219 [`Iterator::min_by_key`] (renamed from `min_by`),
7220 [`Iterator::max_by_key`] (renamed from `max_by`).
92a42be0
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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
7224 `assert!`.
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
9cc50fc6 7228 `thread::park_timeout_ms`.
92a42be0
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7229* The algorithm by which `Vec` reserves additional elements was
7230 [tweaked to not allocate excessive space][1.6a] while still growing
7231 exponentially.
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
7242 improvements.
7243* Sorting slices that are already sorted [is 50% faster in some
7244 cases][1.6s].
7245
7246Cargo
7247-----
7248
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
9cc50fc6
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7255 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
7256 warning.
92a42be0
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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.
7260
7261Misc
7262----
7263
7264* The `unreachable_code` lint [warns when a function call's argument
7265 diverges][1.6dv].
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
7269 expansion.
7270
7271Compatibility Notes
7272-------------------
7273
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].
9cc50fc6
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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
7285 now an error.
92a42be0
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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.
7289
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
74d20737 7295[1.6co]: http://doc.rust-lang.org/core/index.html
92a42be0
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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
7337
7338
b039eaaf
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7339Version 1.5.0 (2015-12-10)
7340==========================
7341
7342* ~700 changes, numerous bugfixes
7343
7344Highlights
7345----------
7346
7347* Stabilized APIs:
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.
7379
7380Breaking Changes
7381----------------
7382
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
7413 features][1.5use].
7414
7415Language
7416--------
7417
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].
7426
7427Libraries
7428---------
7429
7430* `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7431 invariant][1.5c].
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.
ff7c6d11 7436* There are now `From` conversions [between integer types][1.5i] where
b039eaaf
SL
7437 the conversions are lossless.
7438* [`fs::Metadata` implements `Clone`][1.5fs].
7439* The `parse` method [accepts a leading "+" when parsing
7440 integers][1.5pi].
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].
7453
7454Miscellaneous
7455-------------
7456
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].
7466
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
7556
7557Version 1.4.0 (2015-10-29)
7558==========================
e9174d1e
SL
7559
7560* ~1200 changes, numerous bugfixes
7561
7562Highlights
7563----------
7564
7565* Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7566 GNU) are now supported and recommended for use.
7567
7568Breaking Changes
7569----------------
7570
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].
b039eaaf
SL
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].
7584
e9174d1e
SL
7585
7586Language
7587--------
7588
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.
7594
7595Libraries
7596---------
7597
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`],
7616 [`thread::sleep`].
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'
7622 algorithm][s].
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
7630 prelude][pr].
7631* [`Extend<String>` and `FromIterator<String` are both implemented for
7632 `String`][es].
b039eaaf
SL
7633* [`IntoIterator` is implemented for references to `Option` and
7634 `Result`][into2].
e9174d1e 7635* [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
ff7c6d11 7636 Copy`][ext] as part of [RFC 839]. This will cause type inference
b039eaaf 7637 breakage in rare situations.
e9174d1e
SL
7638* [`BinaryHeap` implements `Debug`][bh2].
7639* [`Borrow` and `BorrowMut` are implemented for fixed-size
7640 arrays][bm].
b039eaaf 7641* [`extern fn`s with the "Rust" and "C" ABIs implement common
e9174d1e
SL
7642 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7643* [String comparison is faster][faststr].
b039eaaf
SL
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
ff7c6d11 7647 capacity-altering methods that caused panics for zero-sized types
b039eaaf 7648 was fixed][vd].
e9174d1e
SL
7649* [Function pointers implement traits for up to 12 parameters][fp2].
7650
7651Miscellaneous
7652-------------
7653
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
7657 but Windows).
7658* [The compiler matches traits faster when projections are involved][p].
7659* The 'improper_ctypes' lint [no longer warns about use of `isize` and
7660 `usize`][ffi].
7661* [Cargo now displays useful information about what its doing during
7662 `cargo update`][cu].
7663
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
b039eaaf 7719[fp3]: https://github.com/rust-lang/rust/pull/27307
e9174d1e 7720[i]: https://github.com/rust-lang/rust/pull/27451
b039eaaf 7721[into2]: https://github.com/rust-lang/rust/pull/28039
e9174d1e
SL
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
7735
7736Version 1.3.0 (2015-09-17)
c1a9b12d
SL
7737==============================
7738
7739* ~900 changes, numerous bugfixes
7740
7741Highlights
7742----------
7743
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
7753 time crates.
7754
7755Breaking Changes
7756----------------
7757
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.
7773
7774Language
7775--------
7776
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
7784 broken.
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
7790 [RFC][dropckrfc].
7791
7792Libraries
7793---------
7794
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
7806 [`Any`] trait.
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
7821 error.
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`]
ff7c6d11 7834 are now [specialized to use uninitialized buffers for increased
c1a9b12d
SL
7835 performance][rte].
7836* Lifetime parameters of foreign functions [are now resolved
7837 properly][f].
7838
7839Misc
7840----
7841
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
7858 utility.
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
7863 more strict.
7864* If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7865 will kill the process instead of leaking][nlp].
7866
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
e9174d1e 7880[`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
c1a9b12d
SL
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
7941
e9174d1e
SL
7942Version 1.2.0 (2015-08-07)
7943==========================
62682a34
SL
7944
7945* ~1200 changes, numerous bugfixes
7946
7947Highlights
7948----------
7949
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
7959 `rustc`.
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
ff7c6d11 7963 intrepid Rustaceans.
62682a34
SL
7964* Benchmark compilations are showing a 30% improvement in
7965 bootstrapping over 1.1.
7966
7967Breaking Changes
7968----------------
7969
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
7977 break real code.
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.
7985
7986Language
7987--------
7988
7989* Patterns with `ref mut` now correctly invoke [`DerefMut`] when
8faf50e0 7990 matching against dereferenceable values.
62682a34
SL
7991
7992Libraries
7993---------
7994
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
8001 elements.
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
8015 fanfare.
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`,
8033 `ChildStderr`.
8034* [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
8035 malformed input.
8036
8037Misc
8038----
8039
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.
8045
e9174d1e 8046[`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
62682a34 8047[extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
e9174d1e
SL
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
62682a34 8086[debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
e9174d1e
SL
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
62682a34 8089[align]: https://github.com/rust-lang/rust/pull/25646
e9174d1e 8090[`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
62682a34
SL
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
8099
e9174d1e 8100Version 1.1.0 (2015-06-25)
d9579d0f
AL
8101=========================
8102
8103* ~850 changes, numerous bugfixes
8104
8105Highlights
8106----------
8107
c1a9b12d 8108* The [`std::fs` module has been expanded][fs] to expand the set of
d9579d0f
AL
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.
c1a9b12d
SL
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].
d9579d0f
AL
8118* Thanks to multiple [improvements][sk] to [type checking][pre], as
8119 well as other work, the time to bootstrap the compiler decreased by
8120 32%.
8121
8122Libraries
8123---------
8124
c1a9b12d 8125* The [`str::split_whitespace`] method splits a string on unicode
d9579d0f
AL
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
c1a9b12d 8129 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
d9579d0f
AL
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 +
8145 Send`][arc].
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].
8162
8163Misc
8164----
8165
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
8176 to rustc.
8177* [Android executables are always position independent][pie].
8178* [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
8179 with `Drop`][drop].
8180
e9174d1e
SL
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
d9579d0f 8187[rf]: https://github.com/rust-lang/rust/pull/24491
e9174d1e 8188[err-index]: https://doc.rust-lang.org/error-index.html
d9579d0f
AL
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
e9174d1e
SL
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
d9579d0f
AL
8204[inc]: https://github.com/rust-lang/rust/pull/25522
8205[bh]: https://github.com/rust-lang/rust/pull/25856
e9174d1e 8206[`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
d9579d0f 8207[ll]: https://github.com/rust-lang/rust/pull/26022
e9174d1e 8208[`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
d9579d0f
AL
8209[drop]: https://github.com/rust-lang/rust/pull/24935
8210
e9174d1e 8211Version 1.0.0 (2015-05-15)
bd371182 8212========================
c34b1796 8213
bd371182 8214* ~1500 changes, numerous bugfixes
c34b1796 8215
bd371182
AL
8216Highlights
8217----------
8218
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
8221 the compiler.
8222* Many popular crates on [crates.io] now work on the stable release
8223 channel.
8224* Arithmetic on basic integer types now [checks for overflow in debug
8225 builds][overflow].
8226
8227Language
8228--------
8229
8230* Several [restrictions have been added to trait coherence][coh] in
8231 order to make it easier for upstream authors to change traits
62682a34 8232 without breaking downstream code.
bd371182
AL
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`.
62682a34 8236* Trait bounds [are always invariant][inv], eliminating the need for
bd371182
AL
8237 the `PhantomFn` and `MarkerTrait` lang items, which have been
8238 removed.
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
8263 code.
c34b1796 8264
bd371182
AL
8265Libraries
8266---------
c34b1796 8267
bd371182
AL
8268* The `thread_local` module [has been renamed to `std::thread`][th].
8269* The methods of `IteratorExt` [have been moved to the `Iterator`
8270 trait itself][ie].
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
8285 some others.
8286* [In method resolution, object methods are resolved before inherent
8287 methods][meth].
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
8293 a word?'
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
8300 is now stable.
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.
8316
8317Misc
8318----
8319
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
8323 documentation.
8324* rustdoc has received a number of improvements focused on completion
8325 and polish.
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].
8329
8330
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
c34b1796 8350[send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
c34b1796
AL
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
c34b1796
AL
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
c34b1796
AL
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
8369
bd371182 8370
b039eaaf 8371Version 1.0.0-alpha.2 (2015-02-20)
62682a34 8372=====================================
85aaf69f
SL
8373
8374* ~1300 changes, numerous bugfixes
8375
8376* Highlights
8377
8378 * The various I/O modules were [overhauled][io-rfc] to reduce
62682a34 8379 unnecessary abstractions and provide better interoperation with
85aaf69f
SL
8380 the underlying platform. The old `io` module remains temporarily
8381 at `std::old_io`.
62682a34 8382 * The standard library now [participates in feature gating][feat],
85aaf69f
SL
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].
8386
8387* Language
8388
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].
8413
8414* Libraries
8415
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].
c34b1796 8424 * The `boxed::into_raw` and `Box::from_raw` functions [convert
85aaf69f
SL
8425 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8426 creating raw pointers.
8427
8428* Tooling
8429
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
8438 but is not][onun].
8439
8440* Misc
8441
8442 * Rust is tested against a [LALR grammar][lalr], which parses
8443 almost all the Rust files that rustc does.
8444
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
e9174d1e 8452[feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
85aaf69f
SL
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
85aaf69f
SL
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
8468
62682a34 8469
b039eaaf 8470Version 1.0.0-alpha (2015-01-09)
62682a34 8471==================================
1a4d82fc
JJ
8472
8473 * ~2400 changes, numerous bugfixes
8474
8475 * Highlights
8476
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
8482 before 1.0.
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].
85aaf69f 8494 * "[Rust By Example][rbe]" is now maintained by the Rust team.
1a4d82fc
JJ
8495 * All official Rust binary installers now come with [Cargo], the
8496 Rust package manager.
8497
8498* Language
8499
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
8507 powerful ways.
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
8511 remains valid.
8512 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8513 numeric types.
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
8519 more consistent.
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
8523 notation, `[i..j]`.
8524 * The new range syntax revealed an ambiguity in the fixed-length
8525 array syntax, so now fixed length arrays [are written `[T;
8526 N]`][arrays].
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
8549 language.
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
8566 safe][objsafe].
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`.
8577
8578* Libraries
8579
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
62682a34 8594 used now, it is expected to be superseded in the near future.
1a4d82fc
JJ
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.
8602
8603* Tooling
8604
8605 * [Flexible target specification][flex] allows rustc's code
8606 generation to be configured to support otherwise-unsupported
8607 platforms.
8608 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8609 respective debuggers with Rust-appropriate pretty-printing.
32a655c1 8610 * The Windows installation of Rust is distributed with the
1a4d82fc
JJ
8611 MinGW components currently required to link binaries on that
8612 platform.
8613
8614* Misc
8615
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.
8620
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
e9174d1e 8653[trpl]: https://doc.rust-lang.org/book/index.html
85aaf69f 8654[rbe]: http://rustbyexample.com/
1a4d82fc 8655
62682a34 8656
b039eaaf 8657Version 0.12.0 (2014-10-09)
62682a34 8658=============================
1a4d82fc
JJ
8659
8660 * ~1900 changes, numerous bugfixes
8661
8662 * Highlights
8663
8664 * The introductory documentation (now called The Rust Guide) has
8665 been completely rewritten, as have a number of supplementary
8666 guides.
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.
8679
8680 * Language
8681 * Indexing can be overloaded with the `Index` and `IndexMut`
8682 traits.
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
8699 syntax for slicing.
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`
8705 feature gate.
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
8711 of `use bar = foo`.
8712 * `let` and `match` bindings and argument names in macros are now
8713 hygienic.
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
8724 type.
8725 * Dynamically-sized types have been mostly implemented,
8726 unifying the behavior of fat-pointer types with the rest of the
8727 type system.
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
8736 types.
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.
8740
8741 * Libraries
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
8746 Cargo.
8747 * Most I/O stream types can be cloned and subsequently closed from
8748 a different thread.
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.
8758
8759 * Tooling
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
8772 default.
8773
8774 * Misc
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.
8778
62682a34 8779
b039eaaf 8780Version 0.11.0 (2014-07-02)
62682a34 8781==========================
1a4d82fc
JJ
8782
8783 * ~1700 changes, numerous bugfixes
8784
8785 * Language
8786 * ~[T] has been removed from the language. This type is superseded by
8787 the Vec<T> type.
8788 * ~str has been removed from the language. This type is superseded by
8789 the String type.
8790 * ~T has been removed from the language. This type is superseded by the
8791 Box<T> type.
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
8818 default.
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
8822 literal.
8823 * The Box<T> type is no longer implicitly borrowed to &mut T.
8824 * Procedures are now required to not capture borrowed references.
8825
8826 * Libraries
8827 * The standard library is now a "facade" over a number of underlying
8828 libraries. This means that development on the standard library should
ff7c6d11 8829 be speedier due to smaller crates, as well as a clearer line between
1a4d82fc
JJ
8830 all dependencies.
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
8841 operations.
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
8860 opposed to an IP.
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
8864 Command struct.
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 }},
8871 respectively.
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.
8874
8875 * Tooling
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
8900 doc.rust-lang.org
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
8910 greatly improved.
8911
62682a34 8912
b039eaaf 8913Version 0.10 (2014-04-03)
62682a34 8914=========================
1a4d82fc
JJ
8915
8916 * ~1500 changes, numerous bugfixes
8917
8918 * Language
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
8922 language.
8923 * Patterns with unique strings (`~str`) have been removed from the
8924 language.
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
8937 warn-by-default.
8938 * Unnecessary parentheses
8939 * Uppercase statics
8940 * Camel Case types
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
8956 threads.
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
8961 `DerefMut` traits.
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
8966 `Unsafe` type.
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`.
8970
8971 * Libraries
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.
2c00a5a8 8983 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
1a4d82fc
JJ
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
9028 memory usage.
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
9031 examples.
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
9043 cleanup.
9044 * fourcc: A `fourcc!` macro was introduced
9045 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
9046 hexadecimal literal.
9047
9048 * Tooling
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
9053 release cycle.
9054 * The build process supports disabling rpath support for the rustc binary
9055 itself.
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
9068 were written.
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.
2c00a5a8
XL
9074 * re-exported types have their documentation inlined at the location of the
9075 first re-export.
1a4d82fc
JJ
9076 * search works across crates that have been rendered to the same output
9077 directory.
9078
62682a34 9079
b039eaaf 9080Version 0.9 (2014-01-09)
62682a34 9081==========================
1a4d82fc
JJ
9082
9083 * ~1800 changes, numerous bugfixes
9084
9085 * Language
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
9094 `loop`.
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
9099 called once.
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
9103 of `do` is.
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
9126 an explicit `as`.
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,
9144 "C" elsewhere.
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
9148 attributes.
9149 * The `unknown_features` lint (default: warn) warns about unknown
9150 feature gates.
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.
9164
9165 * Libraries
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
9171 implemented.
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
9198 `task::try`.
9199 * std: Methods that produce iterators generally do not have an `_iter`
9200 suffix now.
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`
9205 trait.
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
9216 threading.
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,
9220 and other I/O.
9221 * green: The green thread scheduler and message passing types are almost
9222 entirely lock-free.
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
9229 mutable slices.
9230
9231 * Tooling
9232 * The `rust` and `rusti` commands have been removed, due to lack of
9233 maintenance.
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
9243 build tools.
9244
62682a34 9245
b039eaaf 9246Version 0.8 (2013-09-26)
62682a34 9247============================
1a4d82fc
JJ
9248
9249 * ~2200 changes, numerous bugfixes
9250
9251 * Language
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
9259 `--cfg ndebug`
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
9262 present.
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
9304 was removed.
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
9308 if executed.
9309
9310 * Libraries
9311 * std: Transitioned to the new runtime, written in Rust.
9312 * std: Added an experimental I/O library, `rt::io`, based on the new
9313 runtime.
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
9324 consistency.
9325 * std: Methods are standardizing on conventions for casting methods:
9326 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
9327 and cheap casts.
9328 * std: The `CString` type in `c_str` provides new ways to convert to and
9329 from C strings.
9330 * std: `DoubleEndedIterator` can yield elements in two directions.
9331 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
9332 two splices.
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
9340 in implementations.
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
9349 methods.
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
9353 `collect` method.
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.
9380
9381 * Other
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
9389 cross-compiling.
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.
9400
62682a34 9401
b039eaaf 9402Version 0.7 (2013-07-03)
62682a34 9403=======================
1a4d82fc
JJ
9404
9405 * ~2000 changes, numerous bugfixes
9406
9407 * Language
9408 * `impl`s no longer accept a visibility qualifier. Put them on methods
9409 instead.
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
9423 the `copy` keyword.
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
9431 `Send`, not.
9432 * The `#[no_freeze]` attribute makes a type that would otherwise be
9433 `Freeze`, not.
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.
9441
9442 * Syntax extensions
9443 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9444 argument list.
9445 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9446 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9447 `#[deriving(...)]`.
9448 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9449 and unsuffixed integer literals.
9450
9451 * Libraries
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`.
2c00a5a8 9462 * std: The prelude no longer re-exports any modules, only types and traits.
1a4d82fc
JJ
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.
9496
9497 * Tooling
60c5eb7d 9498 * `unused_variables` lint mode for unused variables (default: warn).
1a4d82fc
JJ
9499 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9500 (default: warn).
9501 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9502 (default: warn).
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).
9517
62682a34 9518
b039eaaf 9519Version 0.6 (2013-04-03)
62682a34 9520========================
1a4d82fc
JJ
9521
9522 * ~2100 changes, numerous bugfixes
9523
9524 * Syntax changes
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]`)
9565
9566 * Semantic changes
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
9572 * () has size 0
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]
9589
9590 * Libraries
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
9608
9609 * Other
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.
9620
62682a34 9621
b039eaaf 9622Version 0.5 (2012-12-21)
62682a34 9623===========================
1a4d82fc
JJ
9624
9625 * ~900 changes, numerous bugfixes
9626
9627 * Syntax changes
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
9638
9639 * Semantic changes
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
9652 declared
9653
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
9660 to use
9661
9662 * Libraries
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
9673
9674 * Misc
9675 * Added a preliminary REPL, `rusti`
9676 * License changed from MIT to dual MIT/APL2
9677
62682a34 9678
b039eaaf 9679Version 0.4 (2012-10-15)
62682a34 9680==========================
1a4d82fc
JJ
9681
9682 * ~2000 changes, numerous bugfixes
9683
9684 * Syntax
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
9697
9698 * Semantics
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)
9707
9708 * Libraries
9709 * Most binary operators can now be overloaded via the traits in
9710 `core::ops'
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
9714
9715 * Concurrency
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
9719 type
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
9724
9725 * Other
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
9733
62682a34 9734
b039eaaf 9735Version 0.3 (2012-07-12)
62682a34 9736========================
1a4d82fc
JJ
9737
9738 * ~1900 changes, numerous bugfixes
9739
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
9747 control structures
9748 * *-patterns (wildcard extended to all constructor fields)
9749
9750 * Semantic cleanup
9751 * Name resolution pass and exhaustiveness checker rewritten
9752 * Region pointers and borrow checking supersede alias
9753 analysis
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
9757
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
9765
9766 * Type reflection
9767
9768 * Removal of various obsolete features
9769 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9770 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9771
9772 * Constructs: do-while loops ('do' repurposed), fn binding,
9773 resources (replaced by destructors)
9774
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
9779
9780 * New library code
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
9789
9790 * Tool improvements
9791 * Cargo automatically resolves dependencies
9792
62682a34 9793
b039eaaf 9794Version 0.2 (2012-03-29)
62682a34 9795=========================
1a4d82fc
JJ
9796
9797 * >1500 changes, numerous bugfixes
9798
9799 * New docs and doc tooling
9800
9801 * New port: FreeBSD x86_64
9802
9803 * Compilation model enhancements
9804 * Generics now specialized, multiply instantiated
9805 * Functions now inlined across separate crates
9806
9807 * Scheduling, stack and threading fixes
9808 * Noticeably improved message-passing performance
9809 * Explicit schedulers
9810 * Callbacks from C
9811 * Helgrind clean
9812
9813 * Experimental new language features
9814 * Operator overloading
9815 * Region pointers
9816 * Classes
9817
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'.
9826
9827 * New library code
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
9833
62682a34 9834
b039eaaf 9835Version 0.1 (2012-01-20)
62682a34 9836===============================
1a4d82fc
JJ
9837
9838 * Most language features work, including:
9839 * Unique pointers, unique closures, move semantics
9840 * Interface-constrained generics
9841 * Static interface dispatch
9842 * Stack growth
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
9849
9850 * Compiler works with the following configurations:
9851 * Linux: x86 and x86_64 hosts and targets
cc61c64b 9852 * macOS: x86 and x86_64 hosts and targets
1a4d82fc
JJ
9853 * Windows: x86 hosts and targets
9854
9855 * Cross compilation / multi-target configuration supported.
9856
9857 * Preliminary API-documentation and package-management tools included.
9858
9859Known issues:
9860
9861 * Documentation is incomplete.
9862
9863 * Performance is below intended target.
9864
9865 * Standard library APIs are subject to extensive change, reorganization.
9866
9867 * Language-level versioning is not yet operational - future code will
9868 break unexpectedly.