1 Version 1.46.0 (2020-08-27)
2 ==========================
6 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
7 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
8 const functions.][73862]
9 - [The `#[track_caller]` attribute can now be added to functions to use the
10 function's caller's location information for panic messages.][72445]
11 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
12 `x.0.0` over `(x.0).0`.
13 - [`mem::transmute` can now be used in static and constants.][72920] **Note**
14 You currently can't use `mem::transmute` in constant functions.
18 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
19 - [Enabled static "Position Independent Executables" by default
20 for `x86_64-unknown-linux-musl`.][70740]
24 - [`mem::forget` is now a `const fn`.][73887]
25 - [`String` now implements `From<char>`.][73466]
26 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
27 integer types.][73032]
28 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
29 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
30 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
31 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
32 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
33 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
38 - [`vec::Drain::as_slice`]
42 Added a number of new environment variables that are now available when
45 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
46 the specific binary being compiled and the name of the crate.
47 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
48 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
52 - [The target configuration option `abi_blacklist` has been renamed
53 to `unsupported_abis`.][74150] The old name will still continue to work.
54 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
55 This was previously accepted but will become a hard error in a future release.
56 - [Rustc will fail to compile if you have a struct with
57 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
59 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
60 ensure that spans have the correct information, and may cause breakage if you
61 were relying on receiving spans with dummy information.
62 - [The InnoSetup installer for Windows is no longer available.][72569] This was
63 a legacy installer that was replaced by a MSI installer a few years ago but
64 was still being built.
65 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
66 - [Rustc will no longer accept overlapping trait implementations that only
67 differ in how the lifetime was bound.][72493]
68 - [Rustc now correctly relates the lifetime of an existential associated
69 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
70 you to pass a shorter lifetime than expected.
71 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
72 The library will need to be installed for `rustc` to work, even though we
73 expect it to be already available on most systems.
74 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
76 - [Pretty printing of some tokens in procedural macros changed.][75453] The
77 exact output returned by rustc's pretty printing is an unstable
78 implementation detail: we recommend any macro relying on it to switch to a
79 more robust parsing system.
81 [75453]: https://github.com/rust-lang/rust/issues/75453/
82 [74820]: https://github.com/rust-lang/rust/issues/74820/
83 [74420]: https://github.com/rust-lang/rust/issues/74420/
84 [74109]: https://github.com/rust-lang/rust/pull/74109/
85 [74150]: https://github.com/rust-lang/rust/pull/74150/
86 [73862]: https://github.com/rust-lang/rust/pull/73862/
87 [73887]: https://github.com/rust-lang/rust/pull/73887/
88 [73466]: https://github.com/rust-lang/rust/pull/73466/
89 [73516]: https://github.com/rust-lang/rust/pull/73516/
90 [73293]: https://github.com/rust-lang/rust/pull/73293/
91 [73007]: https://github.com/rust-lang/rust/pull/73007/
92 [73032]: https://github.com/rust-lang/rust/pull/73032/
93 [72920]: https://github.com/rust-lang/rust/pull/72920/
94 [72569]: https://github.com/rust-lang/rust/pull/72569/
95 [72583]: https://github.com/rust-lang/rust/pull/72583/
96 [72584]: https://github.com/rust-lang/rust/pull/72584/
97 [72717]: https://github.com/rust-lang/rust/pull/72717/
98 [72437]: https://github.com/rust-lang/rust/pull/72437/
99 [72445]: https://github.com/rust-lang/rust/pull/72445/
100 [72486]: https://github.com/rust-lang/rust/pull/72486/
101 [72493]: https://github.com/rust-lang/rust/pull/72493/
102 [72331]: https://github.com/rust-lang/rust/pull/72331/
103 [71896]: https://github.com/rust-lang/rust/pull/71896/
104 [71660]: https://github.com/rust-lang/rust/pull/71660/
105 [71322]: https://github.com/rust-lang/rust/pull/71322/
106 [70740]: https://github.com/rust-lang/rust/pull/70740/
107 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
108 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
109 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
110 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
111 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
114 Version 1.45.2 (2020-08-03)
115 ==========================
117 * [Fix bindings in tuple struct patterns][74954]
118 * [Fix track_caller integration with trait objects][74784]
120 [74954]: https://github.com/rust-lang/rust/issues/74954
121 [74784]: https://github.com/rust-lang/rust/issues/74784
124 Version 1.45.1 (2020-07-30)
125 ==========================
127 * [Fix const propagation with references.][73613]
128 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
129 * [Avoid spurious implicit region bound.][74509]
130 * [Install clippy on x.py install][74457]
132 [73613]: https://github.com/rust-lang/rust/pull/73613
133 [73078]: https://github.com/rust-lang/rust/issues/73078
134 [74509]: https://github.com/rust-lang/rust/pull/74509
135 [74457]: https://github.com/rust-lang/rust/pull/74457
138 Version 1.45.0 (2020-07-16)
139 ==========================
143 - [Out of range float to int conversions using `as` has been defined as a saturating
144 conversion.][71269] This was previously undefined behaviour, but you can use the
145 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
146 may be desirable in rare performance sensitive situations.
147 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
149 - [Function like procedural macros can now be used in expression, pattern, and statement
150 positions.][68717] This means you can now use a function-like procedural macro
151 anywhere you can use a declarative (`macro_rules!`) macro.
155 - [You can now override individual target features through the `target-feature`
156 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
157 equivalent to `-C target-feature=+avx2,+fma`.
158 - [Added the `force-unwind-tables` flag.][69984] This option allows
159 rustc to always generate unwind tables regardless of panic strategy.
160 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
161 to include LLVM bitcode into generated `rlib`s (this is on by default).
162 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
163 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
164 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
166 \* Refer to Rust's [platform support page][forge-platform-support] for more
167 information on Rust's tiered platform support.
172 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
174 - [`proc_macro::TokenStream` now implements `Default`.][72234]
175 - [You can now use `char` with
176 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
177 a range of codepoints.][72413] E.g.
178 you can now write the following;
180 for ch in 'a'..='z' {
184 // Prints "abcdefghijklmnopqrstuvwxyz"
186 - [`OsString` now implements `FromStr`.][71662]
187 - [The `saturating_neg` method has been added to all signed integer primitive
188 types, and the `saturating_abs` method has been added for all integer
189 primitive types.][71886]
190 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
191 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
193 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
194 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
195 integer types.][69813]
196 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
197 integer types.][72324]
198 - [The `fetch_update` method has been added to all atomic integer types.][71843]
203 - [`BTreeMap::remove_entry`]
205 - [`rc::Weak::as_ptr`]
206 - [`rc::Weak::from_raw`]
207 - [`rc::Weak::into_raw`]
208 - [`str::strip_prefix`]
209 - [`str::strip_suffix`]
210 - [`sync::Weak::as_ptr`]
211 - [`sync::Weak::from_raw`]
212 - [`sync::Weak::into_raw`]
213 - [`char::UNICODE_VERSION`]
214 - [`Span::resolved_at`]
215 - [`Span::located_at`]
216 - [`Span::mixed_site`]
217 - [`unix::process::CommandExt::arg0`]
222 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
227 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
228 `~~outdated information~~` becomes "~~outdated information~~".
229 - [Added an emoji to Rustdoc's deprecated API message.][72014]
233 - [Trying to self initialize a static value (that is creating a value using
234 itself) is unsound and now causes a compile error.][71140]
235 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
236 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
237 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
238 previously undocumented and not intended for public use. Rustdoc still provides
239 a non-zero exit code on errors.
240 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
241 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
242 flags while cargo is adding `embed-bitcode` itself. The recommended way to
243 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
244 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
248 - [Make clippy a git subtree instead of a git submodule][70655]
249 - [Unify the undo log of all snapshot types][69464]
251 [71848]: https://github.com/rust-lang/rust/issues/71848/
252 [73420]: https://github.com/rust-lang/rust/issues/73420/
253 [72324]: https://github.com/rust-lang/rust/pull/72324/
254 [71843]: https://github.com/rust-lang/rust/pull/71843/
255 [71886]: https://github.com/rust-lang/rust/pull/71886/
256 [72234]: https://github.com/rust-lang/rust/pull/72234/
257 [72239]: https://github.com/rust-lang/rust/pull/72239/
258 [72397]: https://github.com/rust-lang/rust/pull/72397/
259 [72413]: https://github.com/rust-lang/rust/pull/72413/
260 [72014]: https://github.com/rust-lang/rust/pull/72014/
261 [72062]: https://github.com/rust-lang/rust/pull/72062/
262 [72094]: https://github.com/rust-lang/rust/pull/72094/
263 [72133]: https://github.com/rust-lang/rust/pull/72133/
264 [71900]: https://github.com/rust-lang/rust/pull/71900/
265 [71928]: https://github.com/rust-lang/rust/pull/71928/
266 [71662]: https://github.com/rust-lang/rust/pull/71662/
267 [71716]: https://github.com/rust-lang/rust/pull/71716/
268 [71447]: https://github.com/rust-lang/rust/pull/71447/
269 [71269]: https://github.com/rust-lang/rust/pull/71269/
270 [71095]: https://github.com/rust-lang/rust/pull/71095/
271 [71140]: https://github.com/rust-lang/rust/pull/71140/
272 [70655]: https://github.com/rust-lang/rust/pull/70655/
273 [70705]: https://github.com/rust-lang/rust/pull/70705/
274 [69984]: https://github.com/rust-lang/rust/pull/69984/
275 [69813]: https://github.com/rust-lang/rust/pull/69813/
276 [69464]: https://github.com/rust-lang/rust/pull/69464/
277 [68717]: https://github.com/rust-lang/rust/pull/68717/
278 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
279 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
280 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
281 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
282 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
283 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
284 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
285 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
286 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
287 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
288 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
289 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
290 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
291 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
292 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
293 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
294 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
297 Version 1.44.1 (2020-06-18)
298 ===========================
300 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
301 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
302 * [Fix crashes when finding backtrace on macOS.][71397]
303 * [Clippy applies lint levels into different files.][clippy/5356]
305 [71397]: https://github.com/rust-lang/rust/issues/71397
306 [73078]: https://github.com/rust-lang/rust/issues/73078
307 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
308 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
311 Version 1.44.0 (2020-06-04)
312 ==========================
316 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
317 - [Added the `unused_braces` lint.][70081]
319 **Syntax-only changes**
321 - [Expansion-driven outline module parsing][69838]
326 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
331 These are still rejected semantically, so you will likely receive an error but
332 these changes can be seen and parsed by macros and conditional compilation.
336 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
337 Additionally when in incremental mode rustc defaults to 256 codegen units.
338 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
339 a panic is thrown.][67502]
340 - [Added tier 3\* support for the `aarch64-unknown-none` and
341 `aarch64-unknown-none-softfloat` targets.][68334]
342 - [Added tier 3 support for `arm64-apple-tvos` and
343 `x86_64-apple-tvos` targets.][68191]
348 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
349 `vec![]` to be able to be used in `const` contexts.
350 - [`convert::Infallible` now implements `Hash`.][70281]
351 - [`OsString` now implements `DerefMut` and `IndexMut` returning
352 a `&mut OsStr`.][70048]
353 - [Unicode 13 is now supported.][69929]
354 - [`String` now implements `From<&mut str>`.][69661]
355 - [`IoSlice` now implements `Copy`.][69403]
356 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
357 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
358 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
359 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
360 integer types.][69373]
364 - [`PathBuf::with_capacity`]
365 - [`PathBuf::capacity`]
367 - [`PathBuf::reserve`]
368 - [`PathBuf::reserve_exact`]
369 - [`PathBuf::shrink_to_fit`]
370 - [`f32::to_int_unchecked`]
371 - [`f64::to_int_unchecked`]
372 - [`Layout::align_to`]
373 - [`Layout::pad_to_align`]
379 - [Added the `cargo tree` command which will print a tree graph of
380 your dependencies.][cargo/8062] E.g.
382 mdbook v0.3.2 (/Users/src/rust/mdbook)
384 │ ├── html5ever v0.24.0
386 │ │ │ └── cfg-if v0.1.9
388 │ │ └── markup5ever v0.9.0
389 │ │ ├── log v0.4.8 (*)
391 │ │ │ └── phf_shared v0.7.24
392 │ │ │ ├── siphasher v0.2.3
393 │ │ │ └── unicase v1.4.2
394 │ │ │ [build-dependencies]
395 │ │ │ └── version_check v0.1.5
398 You can also display dependencies on multiple versions of the same crate with
399 `cargo tree -d` (short for `cargo tree --duplicates`).
403 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
404 the version in the sidebar.][69494]
408 - [Rustc now correctly generates static libraries on Windows GNU targets with
409 the `.a` extension, rather than the previous `.lib`.][70937]
410 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
411 - [The `file_name` property in JSON output of macro errors now points the actual
412 source file rather than the previous format of `<NAME macros>`.][70969]
413 **Note:** this may not point to a file that actually exists on the user's system.
414 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
415 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
416 not allow zero initialization such as `NonZeroU8`.][66059] This was
417 previously a warning.
418 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
419 operator has been defined as a saturating operation.][71269] This was previously
420 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
421 continue using the current behaviour, which may be desirable in rare performance
422 sensitive situations.
426 These changes provide no direct user facing benefits, but represent significant
427 improvements to the internals and overall performance of rustc and
430 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
431 - [Replace big JS dict with JSON parsing.][71250]
433 [69373]: https://github.com/rust-lang/rust/pull/69373/
434 [66059]: https://github.com/rust-lang/rust/pull/66059/
435 [68191]: https://github.com/rust-lang/rust/pull/68191/
436 [68899]: https://github.com/rust-lang/rust/pull/68899/
437 [71147]: https://github.com/rust-lang/rust/pull/71147/
438 [71250]: https://github.com/rust-lang/rust/pull/71250/
439 [70937]: https://github.com/rust-lang/rust/pull/70937/
440 [70969]: https://github.com/rust-lang/rust/pull/70969/
441 [70632]: https://github.com/rust-lang/rust/pull/70632/
442 [70281]: https://github.com/rust-lang/rust/pull/70281/
443 [70345]: https://github.com/rust-lang/rust/pull/70345/
444 [70048]: https://github.com/rust-lang/rust/pull/70048/
445 [70081]: https://github.com/rust-lang/rust/pull/70081/
446 [70156]: https://github.com/rust-lang/rust/pull/70156/
447 [71269]: https://github.com/rust-lang/rust/pull/71269/
448 [69838]: https://github.com/rust-lang/rust/pull/69838/
449 [69929]: https://github.com/rust-lang/rust/pull/69929/
450 [69661]: https://github.com/rust-lang/rust/pull/69661/
451 [69778]: https://github.com/rust-lang/rust/pull/69778/
452 [69494]: https://github.com/rust-lang/rust/pull/69494/
453 [69403]: https://github.com/rust-lang/rust/pull/69403/
454 [69033]: https://github.com/rust-lang/rust/pull/69033/
455 [68692]: https://github.com/rust-lang/rust/pull/68692/
456 [68334]: https://github.com/rust-lang/rust/pull/68334/
457 [67502]: https://github.com/rust-lang/rust/pull/67502/
458 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
459 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
460 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
461 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
462 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
463 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
464 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
465 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
466 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
467 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
468 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
469 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
470 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
473 Version 1.43.1 (2020-05-07)
474 ===========================
476 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
477 * [Fixed the stabilization of AVX-512 features.][71473]
478 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
480 [71430]: https://github.com/rust-lang/rust/pull/71430
481 [71473]: https://github.com/rust-lang/rust/issues/71473
482 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
485 Version 1.43.0 (2020-04-23)
486 ==========================
490 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
491 the type inferred correctly.][68129]
492 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
494 **Syntax only changes**
495 - [Allow `type Foo: Ord` syntactically.][69361]
496 - [Fuse associated and extern items up to defaultness.][69194]
497 - [Syntactically allow `self` in all `fn` contexts.][68764]
498 - [Merge `fn` syntax + cleanup item parsing.][68728]
499 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
500 For example, you may now write:
502 macro_rules! mac_trait {
512 These are still rejected *semantically*, so you will likely receive an error but
513 these changes can be seen and parsed by macros and
514 conditional compilation.
519 - [You can now pass multiple lint flags to rustc to override the previous
520 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
521 everything in the `unused` lint group except `unused-variables` which
522 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
523 everything in the `unused` lint group **including** `unused-variables` since
524 the allow flag is specified before the deny flag (and therefore overridden).
525 - [rustc will now prefer your system MinGW libraries over its bundled libraries
526 if they are available on `windows-gnu`.][67429]
527 - [rustc now buffers errors/warnings printed in JSON.][69227]
531 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
532 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
533 respectively.][69538] **Note** These conversions are only available when `N`
535 - [You can now use associated constants on floats and integers directly, rather
536 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
537 `f32::NAN` with no imports.
538 - [`u8::is_ascii` is now `const`.][68984]
539 - [`String` now implements `AsMut<str>`.][68742]
540 - [Added the `primitive` module to `std` and `core`.][67637] This module
541 reexports Rust's primitive types. This is mainly useful in macros
542 where you want avoid these types being shadowed.
543 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
544 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
548 - [`Once::is_completed`]
553 - [`iter::once_with`]
557 - [You can now set config `[profile]`s in your `.cargo/config`, or through
558 your environment.][cargo/7823]
559 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
560 executable path when running integration tests or benchmarks.][cargo/7697]
561 `<name>` is the name of your binary as-is e.g. If you wanted the executable
562 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
566 - [Certain checks in the `const_err` lint were deemed unrelated to const
567 evaluation][69185], and have been moved to the `unconditional_panic` and
568 `arithmetic_overflow` lints.
573 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
574 has been a warning since 1.36.0.
575 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
576 led to some instances being accepted, and now correctly emits a hard error.
578 [69340]: https://github.com/rust-lang/rust/pull/69340
582 These changes provide no direct user facing benefits, but represent significant
583 improvements to the internals and overall performance of `rustc` and
586 - [All components are now built with `opt-level=3` instead of `2`.][67878]
587 - [Improved how rustc generates drop code.][67332]
588 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
589 - [traits: preallocate 2 Vecs of known initial size][69022]
590 - [Avoid exponential behaviour when relating types][68772]
591 - [Skip `Drop` terminators for enum variants without drop glue][68943]
592 - [Improve performance of coherence checks][68966]
593 - [Deduplicate types in the generator witness][68672]
594 - [Invert control in struct_lint_level.][68725]
596 [67332]: https://github.com/rust-lang/rust/pull/67332/
597 [67429]: https://github.com/rust-lang/rust/pull/67429/
598 [67637]: https://github.com/rust-lang/rust/pull/67637/
599 [67642]: https://github.com/rust-lang/rust/pull/67642/
600 [67878]: https://github.com/rust-lang/rust/pull/67878/
601 [67885]: https://github.com/rust-lang/rust/pull/67885/
602 [68129]: https://github.com/rust-lang/rust/pull/68129/
603 [68672]: https://github.com/rust-lang/rust/pull/68672/
604 [68725]: https://github.com/rust-lang/rust/pull/68725/
605 [68728]: https://github.com/rust-lang/rust/pull/68728/
606 [68738]: https://github.com/rust-lang/rust/pull/68738/
607 [68742]: https://github.com/rust-lang/rust/pull/68742/
608 [68764]: https://github.com/rust-lang/rust/pull/68764/
609 [68772]: https://github.com/rust-lang/rust/pull/68772/
610 [68943]: https://github.com/rust-lang/rust/pull/68943/
611 [68952]: https://github.com/rust-lang/rust/pull/68952/
612 [68966]: https://github.com/rust-lang/rust/pull/68966/
613 [68984]: https://github.com/rust-lang/rust/pull/68984/
614 [69022]: https://github.com/rust-lang/rust/pull/69022/
615 [69185]: https://github.com/rust-lang/rust/pull/69185/
616 [69194]: https://github.com/rust-lang/rust/pull/69194/
617 [69201]: https://github.com/rust-lang/rust/pull/69201/
618 [69227]: https://github.com/rust-lang/rust/pull/69227/
619 [69548]: https://github.com/rust-lang/rust/pull/69548/
620 [69256]: https://github.com/rust-lang/rust/pull/69256/
621 [69361]: https://github.com/rust-lang/rust/pull/69361/
622 [69366]: https://github.com/rust-lang/rust/pull/69366/
623 [69538]: https://github.com/rust-lang/rust/pull/69538/
624 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
625 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
626 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
627 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
628 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
629 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
630 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
631 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
634 Version 1.42.0 (2020-03-12)
635 ==========================
639 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
641 fn foo(words: &[&str]) {
643 ["Hello", "World", "!", ..] => println!("Hello World!"),
644 ["Foo", "Bar", ..] => println!("Baz"),
645 rest => println!("{:?}", rest),
649 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
650 that you can create an enum that has the exact layout and ABI of the type
652 - [There are some *syntax-only* changes:][67131]
653 - `default` is syntactically allowed before items in `trait` definitions.
654 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
655 leave out their bodies in favor of `;`.
656 - Bounds on associated types in `impl`s are now syntactically allowed
657 (e.g. `type Foo: Ord;`).
658 - `...` (the C-variadic type) may occur syntactically directly as the type of
659 any function parameter.
661 These are still rejected *semantically*, so you will likely receive an error
662 but these changes can be seen and parsed by procedural macros and
663 conditional compilation.
667 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
668 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
669 - [`Option::{expect,unwrap}` and
670 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
671 pointing to the location where they were called, rather than
672 `core`'s internals. ][67887]
674 \* Refer to Rust's [platform support page][forge-platform-support] for more
675 information on Rust's tiered platform support.
679 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
680 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
681 to implement `Sized`.][67935]
682 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
683 - [`Layout::new` is now `const`.][66254]
684 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
689 - [`CondVar::wait_while`]
690 - [`CondVar::wait_timeout_while`]
692 - [`DebugMap::value`]
693 - [`ManuallyDrop::take`]
695 - [`ptr::slice_from_raw_parts_mut`]
696 - [`ptr::slice_from_raw_parts`]
700 - [You no longer need to include `extern crate proc_macro;` to be able to
701 `use proc_macro;` in the `2018` edition.][cargo/7700]
705 - [`Error::description` has been deprecated, and its use will now produce a
706 warning.][66919] It's recommended to use `Display`/`to_string` instead.
708 [68253]: https://github.com/rust-lang/rust/pull/68253/
709 [68348]: https://github.com/rust-lang/rust/pull/68348/
710 [67935]: https://github.com/rust-lang/rust/pull/67935/
711 [68339]: https://github.com/rust-lang/rust/pull/68339/
712 [68122]: https://github.com/rust-lang/rust/pull/68122/
713 [67712]: https://github.com/rust-lang/rust/pull/67712/
714 [67887]: https://github.com/rust-lang/rust/pull/67887/
715 [67131]: https://github.com/rust-lang/rust/pull/67131/
716 [67233]: https://github.com/rust-lang/rust/pull/67233/
717 [66899]: https://github.com/rust-lang/rust/pull/66899/
718 [66919]: https://github.com/rust-lang/rust/pull/66919/
719 [66254]: https://github.com/rust-lang/rust/pull/66254/
720 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
721 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
722 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
723 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
724 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
725 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
726 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
727 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
728 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
731 Version 1.41.1 (2020-02-27)
732 ===========================
734 * [Always check types of static items][69145]
735 * [Always check lifetime bounds of `Copy` impls][69145]
736 * [Fix miscompilation in callers of `Layout::repeat`][69225]
738 [69225]: https://github.com/rust-lang/rust/issues/69225
739 [69145]: https://github.com/rust-lang/rust/pull/69145
742 Version 1.41.0 (2020-01-30)
743 ===========================
748 - [You can now pass type parameters to foreign items when implementing
749 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
750 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
751 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
752 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
753 - [You can now use any valid identifier in a `format_args` macro.][66847]
754 Previously identifiers starting with an underscore were not allowed.
755 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
756 enum variants.][66183] These are still rejected semantically, but
757 can be seen and parsed by procedural macros and conditional compilation.
762 - [Rustc will now warn if you have unused loop `'label`s.][66325]
763 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
764 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
765 - [You can now pass an arguments file passing the `@path` syntax
766 to rustc.][66172] Note that the format differs somewhat from what is
767 found in other tooling; please see [the documentation][argfile-docs] for
769 - [You can now provide `--extern` flag without a path, indicating that it is
770 available from the search path or specified with an `-L` flag.][64882]
772 \* Refer to Rust's [platform support page][forge-platform-support] for more
773 information on Rust's tiered platform support.
775 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
780 - [The `core::panic` module is now stable.][66771] It was already stable
782 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
783 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
784 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
790 - [`Result::map_or_else`]
791 - [`std::rc::Weak::weak_count`]
792 - [`std::rc::Weak::strong_count`]
793 - [`std::sync::Weak::weak_count`]
794 - [`std::sync::Weak::strong_count`]
799 - [Cargo will now document all the private items for binary crates
800 by default.][cargo/7593]
801 - [`cargo-install` will now reinstall the package if it detects that it is out
802 of date.][cargo/7560]
803 - [Cargo.lock now uses a more git friendly format that should help to reduce
804 merge conflicts.][cargo/7579]
805 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
806 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
807 optimisation level to `2` for debug builds. You can also use
808 `[profile.<profile>.build-override]` to override build scripts and
814 - [You can now specify `edition` in documentation code blocks to compile the block
815 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
816 should be compiled the 2018 edition of Rust.
817 - [You can now provide custom themes to rustdoc with `--theme`, and check the
818 current theme with `--check-theme`.][54733]
819 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
824 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
825 Apple targets.][apple-32bit-drop] This means that the source code is still
826 available to build, but the targets are no longer being tested and release
827 binaries for those platforms will no longer be distributed by the Rust project.
828 Please refer to the linked blog post for more information.
830 [54733]: https://github.com/rust-lang/rust/pull/54733/
831 [61351]: https://github.com/rust-lang/rust/pull/61351/
832 [67255]: https://github.com/rust-lang/rust/pull/67255/
833 [66661]: https://github.com/rust-lang/rust/pull/66661/
834 [66771]: https://github.com/rust-lang/rust/pull/66771/
835 [66847]: https://github.com/rust-lang/rust/pull/66847/
836 [66238]: https://github.com/rust-lang/rust/pull/66238/
837 [66277]: https://github.com/rust-lang/rust/pull/66277/
838 [66325]: https://github.com/rust-lang/rust/pull/66325/
839 [66172]: https://github.com/rust-lang/rust/pull/66172/
840 [66183]: https://github.com/rust-lang/rust/pull/66183/
841 [65879]: https://github.com/rust-lang/rust/pull/65879/
842 [65013]: https://github.com/rust-lang/rust/pull/65013/
843 [64882]: https://github.com/rust-lang/rust/pull/64882/
844 [64325]: https://github.com/rust-lang/rust/pull/64325/
845 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
846 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
847 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
848 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
849 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
850 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
851 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
852 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
853 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
854 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
855 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
857 Version 1.40.0 (2019-12-19)
858 ===========================
862 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
863 `const` contexts.][65188] e.g.
866 pub struct Point(i32, i32);
868 const ORIGIN: Point = {
869 let constructor = Point;
875 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
876 indicate that there may be variants or fields added in the future.][64639]
877 For example this requires adding a wild-card branch (`_ => {}`) to any match
878 statements on a non-exhaustive `enum`. [(RFC 2008)]
879 - [You can now use function-like procedural macros in `extern` blocks and in
880 type positions.][63931] e.g. `type Generated = macro!();`
881 - [Function-like and attribute procedural macros can now emit
882 `macro_rules!` items, so you can now have your macros generate macros.][64035]
883 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
884 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
885 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
889 - [Added tier 3 support\* for the
890 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
891 - [Added tier 3 support for the
892 `aarch64-unknown-none-softfloat` target.][64589]
893 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
894 `mips64el-unknown-linux-muslabi64` targets.][65843]
896 \* Refer to Rust's [platform support page][forge-platform-support] for more
897 information on Rust's tiered platform support.
901 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
905 - [`BTreeMap::get_key_value`]
906 - [`HashMap::get_key_value`]
907 - [`Option::as_deref_mut`]
908 - [`Option::as_deref`]
909 - [`Option::flatten`]
910 - [`UdpSocket::peer_addr`]
911 - [`f32::to_be_bytes`]
912 - [`f32::to_le_bytes`]
913 - [`f32::to_ne_bytes`]
914 - [`f64::to_be_bytes`]
915 - [`f64::to_le_bytes`]
916 - [`f64::to_ne_bytes`]
917 - [`f32::from_be_bytes`]
918 - [`f32::from_le_bytes`]
919 - [`f32::from_ne_bytes`]
920 - [`f64::from_be_bytes`]
921 - [`f64::from_le_bytes`]
922 - [`f64::from_ne_bytes`]
929 - [Cargo will now always display warnings, rather than only on
930 fresh builds.][cargo/7450]
931 - [Feature flags (except `--all-features`) passed to a virtual workspace will
932 now produce an error.][cargo/7507] Previously these flags were ignored.
933 - [You can now publish `dev-dependencies` without including
934 a `version`.][cargo/7333]
938 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
939 when running documentation tests with `rustdoc`.][63803]
943 - [As previously announced, any previous NLL warnings in the 2015 edition are
944 now hard errors.][64221]
945 - [The `include!` macro will now warn if it failed to include the
946 entire file.][64284] The `include!` macro unintentionally only includes the
947 first _expression_ in a file, and this can be unintuitive. This will become
948 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
949 - [Using `#[inline]` on function prototypes and consts now emits a warning under
950 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
951 or `extern` blocks now correctly emits a hard error.
953 [65294]: https://github.com/rust-lang/rust/pull/65294/
954 [66103]: https://github.com/rust-lang/rust/pull/66103/
955 [65843]: https://github.com/rust-lang/rust/pull/65843/
956 [65188]: https://github.com/rust-lang/rust/pull/65188/
957 [65092]: https://github.com/rust-lang/rust/pull/65092/
958 [64589]: https://github.com/rust-lang/rust/pull/64589/
959 [64639]: https://github.com/rust-lang/rust/pull/64639/
960 [64221]: https://github.com/rust-lang/rust/pull/64221/
961 [64284]: https://github.com/rust-lang/rust/pull/64284/
962 [63931]: https://github.com/rust-lang/rust/pull/63931/
963 [64035]: https://github.com/rust-lang/rust/pull/64035/
964 [63674]: https://github.com/rust-lang/rust/pull/63674/
965 [63803]: https://github.com/rust-lang/rust/pull/63803/
966 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
967 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
968 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
969 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
970 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
971 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
972 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
973 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
974 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
975 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
976 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
977 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
978 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
979 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
980 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
981 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
982 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
983 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
984 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
985 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
986 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
987 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
988 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
989 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
990 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
991 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
994 Version 1.39.0 (2019-11-07)
995 ===========================
999 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1000 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1001 - [You can now use certain attributes on function, closure, and function pointer
1002 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1003 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1004 attributes applied to items. e.g.
1007 #[cfg(windows)] slice: &[u16],
1008 #[cfg(not(windows))] slice: &[u8],
1013 - [You can now take shared references to bind-by-move patterns in the `if` guards
1014 of `match` arms.][63118] e.g.
1017 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1021 // ---- `nums` is bound by move.
1022 if nums.iter().sum::<u8>() == 10
1023 // ^------ `.iter()` implicitly takes a reference to `nums`.
1026 // ----------- Legal as `nums` was bound by move and so we have ownership.
1028 _ => unreachable!(),
1037 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1038 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1039 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1040 **Note** Cargo currently doesn't use this feature. Refer to
1041 [cargo#7315][cargo/7315] to track this feature's progress.
1042 - [You can now pass `--show-output` argument to test binaries to print the
1043 output of successful tests.][62600]
1046 \* Refer to Rust's [platform support page][forge-platform-support] for more
1047 information on Rust's tiered platform support.
1051 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1052 - [`LinkedList::new` is now a `const` function.][63684]
1053 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1054 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1055 now `const`.][63786]
1059 - [`Pin::into_inner`]
1060 - [`Instant::checked_duration_since`]
1061 - [`Instant::saturating_duration_since`]
1065 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1066 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1067 `--all` is now deprecated.
1071 - [You can now pass `-Clinker` to rustdoc to control the linker used
1072 for compiling doctests.][63834]
1076 - [Code that was previously accepted by the old borrow checker, but rejected by
1077 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1078 previously a warning, and will also become a hard error in the Rust 2015
1079 edition in the 1.40.0 release.
1080 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1081 run tests.][63827] This should improve performance when running a large
1083 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1084 recommended to use the `?` operator instead.
1085 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1088 [62600]: https://github.com/rust-lang/rust/pull/62600/
1089 [62672]: https://github.com/rust-lang/rust/pull/62672/
1090 [63118]: https://github.com/rust-lang/rust/pull/63118/
1091 [63209]: https://github.com/rust-lang/rust/pull/63209/
1092 [63402]: https://github.com/rust-lang/rust/pull/63402/
1093 [63565]: https://github.com/rust-lang/rust/pull/63565/
1094 [63595]: https://github.com/rust-lang/rust/pull/63595/
1095 [63684]: https://github.com/rust-lang/rust/pull/63684/
1096 [63698]: https://github.com/rust-lang/rust/pull/63698/
1097 [63770]: https://github.com/rust-lang/rust/pull/63770/
1098 [63786]: https://github.com/rust-lang/rust/pull/63786/
1099 [63827]: https://github.com/rust-lang/rust/pull/63827/
1100 [63834]: https://github.com/rust-lang/rust/pull/63834/
1101 [63927]: https://github.com/rust-lang/rust/pull/63927/
1102 [63933]: https://github.com/rust-lang/rust/pull/63933/
1103 [63934]: https://github.com/rust-lang/rust/pull/63934/
1104 [63938]: https://github.com/rust-lang/rust/pull/63938/
1105 [63940]: https://github.com/rust-lang/rust/pull/63940/
1106 [63941]: https://github.com/rust-lang/rust/pull/63941/
1107 [63945]: https://github.com/rust-lang/rust/pull/63945/
1108 [64010]: https://github.com/rust-lang/rust/pull/64010/
1109 [64028]: https://github.com/rust-lang/rust/pull/64028/
1110 [64334]: https://github.com/rust-lang/rust/pull/64334/
1111 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1112 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1113 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1114 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1115 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1116 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1118 Version 1.38.0 (2019-09-26)
1119 ==========================
1123 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1124 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1128 - [Added pipelined compilation support to `rustc`.][62766] This will
1129 improve compilation times in some cases. For further information please refer
1130 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1131 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1132 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1133 `x86_64-uwp-windows-msvc` targets.][60260]
1134 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1135 `armv7-unknown-linux-musleabi` targets.][63107]
1136 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1137 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1139 \* Refer to Rust's [platform support page][forge-platform-support] for more
1140 information on Rust's tiered platform support.
1144 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1145 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1146 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1147 is available at `std::clone::Clone`). This also makes all built-in macros
1148 available in `std`/`core` root. e.g. `std::include_bytes!`.
1149 - [`str::Chars` now implements `Debug`.][63000]
1150 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1151 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1152 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1153 - [Added euclidean remainder and division operations (`div_euclid`,
1154 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1155 `overflowing`, and `wrapping` versions are available for all
1157 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1158 `PartialEq`.][61491]
1159 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1163 - [`<*const T>::cast`]
1164 - [`<*mut T>::cast`]
1165 - [`Duration::as_secs_f32`]
1166 - [`Duration::as_secs_f64`]
1167 - [`Duration::div_f32`]
1168 - [`Duration::div_f64`]
1169 - [`Duration::from_secs_f32`]
1170 - [`Duration::from_secs_f64`]
1171 - [`Duration::mul_f32`]
1172 - [`Duration::mul_f64`]
1173 - [`any::type_name`]
1177 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1178 - [You can now pass the `--features` option multiple times to enable
1179 multiple features.][cargo/7084]
1183 - [`rustc` will now warn about some incorrect uses of
1184 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1188 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1190 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1191 issues][62896] with certain crates such as libc.
1193 [60260]: https://github.com/rust-lang/rust/pull/60260/
1194 [61457]: https://github.com/rust-lang/rust/pull/61457/
1195 [61491]: https://github.com/rust-lang/rust/pull/61491/
1196 [61884]: https://github.com/rust-lang/rust/pull/61884/
1197 [61953]: https://github.com/rust-lang/rust/pull/61953/
1198 [62042]: https://github.com/rust-lang/rust/pull/62042/
1199 [62528]: https://github.com/rust-lang/rust/pull/62528/
1200 [62583]: https://github.com/rust-lang/rust/pull/62583/
1201 [62735]: https://github.com/rust-lang/rust/pull/62735/
1202 [62766]: https://github.com/rust-lang/rust/pull/62766/
1203 [62784]: https://github.com/rust-lang/rust/pull/62784/
1204 [62785]: https://github.com/rust-lang/rust/issues/62785/
1205 [62814]: https://github.com/rust-lang/rust/pull/62814/
1206 [62896]: https://github.com/rust-lang/rust/issues/62896/
1207 [63000]: https://github.com/rust-lang/rust/pull/63000/
1208 [63056]: https://github.com/rust-lang/rust/pull/63056/
1209 [63107]: https://github.com/rust-lang/rust/pull/63107/
1210 [63346]: https://github.com/rust-lang/rust/pull/63346/
1211 [63421]: https://github.com/rust-lang/rust/pull/63421/
1212 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1213 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1214 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1215 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1216 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1217 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1218 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1219 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1220 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1221 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1222 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1223 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1224 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1225 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1226 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1228 Version 1.37.0 (2019-08-15)
1229 ==========================
1233 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1234 [`Box`][62228], or an [array][62235] and unused.
1235 - [You can now use the `cfg` and `cfg_attr` attributes on
1236 generic parameters.][61547]
1237 - [You can now use enum variants through type alias.][61682] e.g. You can
1238 write the following:
1240 type MyOption = Option<u8>;
1242 fn increment_or_zero(x: MyOption) -> u8 {
1244 MyOption::Some(y) => y + 1,
1245 MyOption::None => 0,
1249 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1250 `const _: u32 = 5;`.
1251 - [You can now use `#[repr(align(X)]` on enums.][61229]
1252 - [The `?` Kleene macro operator is now available in the
1253 2015 edition.][60932]
1257 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1258 and `-C profile-use` flags.][61268] For more information on how to use profile
1259 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1260 - [The `rust-lldb` wrapper script should now work again.][61827]
1264 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1268 - [`BufReader::buffer`]
1269 - [`BufWriter::buffer`]
1270 - [`Cell::from_mut`]
1271 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1272 - [`DoubleEndedIterator::nth_back`]
1274 - [`Wrapping::reverse_bits`]
1275 - [`i128::reverse_bits`]
1276 - [`i16::reverse_bits`]
1277 - [`i32::reverse_bits`]
1278 - [`i64::reverse_bits`]
1279 - [`i8::reverse_bits`]
1280 - [`isize::reverse_bits`]
1281 - [`slice::copy_within`]
1282 - [`u128::reverse_bits`]
1283 - [`u16::reverse_bits`]
1284 - [`u32::reverse_bits`]
1285 - [`u64::reverse_bits`]
1286 - [`u8::reverse_bits`]
1287 - [`usize::reverse_bits`]
1291 - [`Cargo.lock` files are now included by default when publishing executable crates
1292 with executables.][cargo/7026]
1293 - [You can now specify `default-run="foo"` in `[package]` to specify the
1294 default executable to use for `cargo run`.][cargo/7056]
1301 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1302 Please transition your code to using the `..=` syntax for inclusive
1304 - [Using a trait object without the `dyn` will now warn by default.][61203]
1305 Please transition your code to use `dyn Trait` for trait objects instead.
1307 [62228]: https://github.com/rust-lang/rust/pull/62228/
1308 [62235]: https://github.com/rust-lang/rust/pull/62235/
1309 [61802]: https://github.com/rust-lang/rust/pull/61802/
1310 [61827]: https://github.com/rust-lang/rust/pull/61827/
1311 [61547]: https://github.com/rust-lang/rust/pull/61547/
1312 [61682]: https://github.com/rust-lang/rust/pull/61682/
1313 [61268]: https://github.com/rust-lang/rust/pull/61268/
1314 [61342]: https://github.com/rust-lang/rust/pull/61342/
1315 [61347]: https://github.com/rust-lang/rust/pull/61347/
1316 [61100]: https://github.com/rust-lang/rust/pull/61100/
1317 [61203]: https://github.com/rust-lang/rust/pull/61203/
1318 [61229]: https://github.com/rust-lang/rust/pull/61229/
1319 [60932]: https://github.com/rust-lang/rust/pull/60932/
1320 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1321 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1322 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1323 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1324 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1325 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1326 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1327 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1328 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1329 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1330 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1331 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1332 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1333 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1334 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1335 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1336 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1337 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1338 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1339 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1340 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1341 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1342 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1343 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1346 Version 1.36.0 (2019-07-04)
1347 ==========================
1351 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1352 - [The order of traits in trait objects no longer affects the semantics of that
1353 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1354 `dyn fmt::Debug + Send`, where this was previously not the case.
1358 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1359 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1360 - [`mem::needs_drop` is now available as a const fn.][60364]
1361 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1362 - [`String` now implements `BorrowMut<str>`.][60404]
1363 - [`io::Cursor` now implements `Default`.][60234]
1364 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1365 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1366 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1367 environment has access to heap memory allocation.
1368 - [`String` now implements `From<&String>`.][59825]
1369 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1370 return a tuple of each argument when there is multiple arguments.
1371 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1376 - [`VecDeque::rotate_left`]
1377 - [`VecDeque::rotate_right`]
1378 - [`Iterator::copied`]
1380 - [`io::IoSliceMut`]
1381 - [`Read::read_vectored`]
1382 - [`Write::write_vectored`]
1383 - [`str::as_mut_ptr`]
1384 - [`mem::MaybeUninit`]
1385 - [`pointer::align_offset`]
1386 - [`future::Future`]
1388 - [`task::RawWaker`]
1389 - [`task::RawWakerVTable`]
1395 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1396 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1398 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1402 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1409 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1410 longer recommended, and will be deprecated in 1.39.0.
1412 [60318]: https://github.com/rust-lang/rust/pull/60318/
1413 [60364]: https://github.com/rust-lang/rust/pull/60364/
1414 [60370]: https://github.com/rust-lang/rust/pull/60370/
1415 [60404]: https://github.com/rust-lang/rust/pull/60404/
1416 [60234]: https://github.com/rust-lang/rust/pull/60234/
1417 [60244]: https://github.com/rust-lang/rust/pull/60244/
1418 [58623]: https://github.com/rust-lang/rust/pull/58623/
1419 [59648]: https://github.com/rust-lang/rust/pull/59648/
1420 [59675]: https://github.com/rust-lang/rust/pull/59675/
1421 [59825]: https://github.com/rust-lang/rust/pull/59825/
1422 [59826]: https://github.com/rust-lang/rust/pull/59826/
1423 [59445]: https://github.com/rust-lang/rust/pull/59445/
1424 [59114]: https://github.com/rust-lang/rust/pull/59114/
1425 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1426 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1427 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1428 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1429 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1430 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1431 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1432 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1433 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1434 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1435 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1436 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1437 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1438 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1439 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1440 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1441 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1442 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1443 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1444 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1447 Version 1.35.0 (2019-05-23)
1448 ==========================
1452 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1453 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1454 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1456 unsafe fn call_unsafe(func: unsafe fn()) {
1461 unsafe { call_unsafe(|| {}); }
1468 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1469 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1470 - [Added the `wasm32-unknown-wasi` target.][59464]
1475 - [`Thread` will now show its ID in `Debug` output.][59460]
1476 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1477 - [`alloc::System` now implements `Default`.][59451]
1478 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1480 - [`char::{ToLowercase, ToUppercase}` now
1481 implement `ExactSizeIterator`.][58778]
1482 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1483 - [Removed the `Read` trait bounds
1484 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1485 - [You can now call the `dbg!` macro without any parameters to print the file
1486 and line where it is called.][57847]
1487 - [In place ASCII case conversions are now up to 4× faster.][59283]
1488 e.g. `str::make_ascii_lowercase`
1489 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1496 - [`RefCell::replace_with`]
1497 - [`RefCell::map_split`]
1499 - [`Range::contains`]
1500 - [`RangeFrom::contains`]
1501 - [`RangeTo::contains`]
1502 - [`RangeInclusive::contains`]
1503 - [`RangeToInclusive::contains`]
1504 - [`Option::copied`]
1508 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1509 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1514 - [The Rust toolchain is now available natively for musl based distros.][58575]
1516 [59460]: https://github.com/rust-lang/rust/pull/59460/
1517 [59464]: https://github.com/rust-lang/rust/pull/59464/
1518 [59500]: https://github.com/rust-lang/rust/pull/59500/
1519 [59512]: https://github.com/rust-lang/rust/pull/59512/
1520 [59580]: https://github.com/rust-lang/rust/pull/59580/
1521 [59283]: https://github.com/rust-lang/rust/pull/59283/
1522 [59451]: https://github.com/rust-lang/rust/pull/59451/
1523 [59076]: https://github.com/rust-lang/rust/pull/59076/
1524 [58778]: https://github.com/rust-lang/rust/pull/58778/
1525 [58717]: https://github.com/rust-lang/rust/pull/58717/
1526 [58369]: https://github.com/rust-lang/rust/pull/58369/
1527 [58423]: https://github.com/rust-lang/rust/pull/58423/
1528 [58080]: https://github.com/rust-lang/rust/pull/58080/
1529 [57847]: https://github.com/rust-lang/rust/pull/57847/
1530 [58575]: https://github.com/rust-lang/rust/pull/58575
1531 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1532 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1533 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1534 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1535 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1536 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1537 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1538 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1539 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1540 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1541 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1542 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1544 Version 1.34.2 (2019-05-14)
1545 ===========================
1547 * [Destabilize the `Error::type_id` function due to a security
1548 vulnerability][60785] ([CVE-2019-12083])
1550 [60785]: https://github.com/rust-lang/rust/pull/60785
1551 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1553 Version 1.34.1 (2019-04-25)
1554 ===========================
1556 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1557 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1558 * [Fix Clippy panic when checking some macros][clippy/3805]
1560 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1561 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1562 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1564 Version 1.34.0 (2019-04-11)
1565 ==========================
1569 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1570 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1572 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1573 `#[attr{}]` procedural macros.][57367]
1574 - [You can now write `extern crate self as foo;`][57407] to import your
1575 crate's root into the extern prelude.
1580 - [You can now target `riscv64imac-unknown-none-elf` and
1581 `riscv64gc-unknown-none-elf`.][58406]
1582 - [You can now enable linker plugin LTO optimisations with
1583 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1584 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1586 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1591 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1592 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1593 the `Hash` trait to create an iterator.
1594 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1595 methods.][58421] Most notably you no longer require the `Ord` trait to create
1597 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1598 for all numeric types.][58044]
1599 - [Indexing a `str` is now generic over all types that
1600 implement `SliceIndex<str>`.][57604]
1601 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1602 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1603 produce a warning if their returning type is unused.
1604 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1605 `overflowing_pow` are now available for all numeric types.][57873] These are
1606 equivalent to methods such as `wrapping_add` for the `pow` operation.
1614 * [`Error::type_id`]
1615 * [`atomic::AtomicI16`]
1616 * [`atomic::AtomicI32`]
1617 * [`atomic::AtomicI64`]
1618 * [`atomic::AtomicI8`]
1619 * [`atomic::AtomicU16`]
1620 * [`atomic::AtomicU32`]
1621 * [`atomic::AtomicU64`]
1622 * [`atomic::AtomicU8`]
1623 * [`convert::Infallible`]
1624 * [`convert::TryFrom`]
1625 * [`convert::TryInto`]
1627 * [`iter::successors`]
1628 * [`num::NonZeroI128`]
1629 * [`num::NonZeroI16`]
1630 * [`num::NonZeroI32`]
1631 * [`num::NonZeroI64`]
1632 * [`num::NonZeroI8`]
1633 * [`num::NonZeroIsize`]
1634 * [`slice::sort_by_cached_key`]
1635 * [`str::escape_debug`]
1636 * [`str::escape_default`]
1637 * [`str::escape_unicode`]
1638 * [`str::split_ascii_whitespace`]
1641 * [`Instant::checked_add`]
1642 * [`Instant::checked_sub`]
1643 * [`SystemTime::checked_add`]
1644 * [`SystemTime::checked_sub`]
1648 - [You can now use alternative registries to crates.io.][cargo/6654]
1652 - [You can now use the `?` operator in your documentation tests without manually
1653 adding `fn main() -> Result<(), _> {}`.][56470]
1657 - [`Command::before_exec` is being replaced by the unsafe method
1658 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1659 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1660 can now use `const` functions in `static` variables.
1662 [58370]: https://github.com/rust-lang/rust/pull/58370/
1663 [58406]: https://github.com/rust-lang/rust/pull/58406/
1664 [58421]: https://github.com/rust-lang/rust/pull/58421/
1665 [58166]: https://github.com/rust-lang/rust/pull/58166/
1666 [58044]: https://github.com/rust-lang/rust/pull/58044/
1667 [58057]: https://github.com/rust-lang/rust/pull/58057/
1668 [58059]: https://github.com/rust-lang/rust/pull/58059/
1669 [57809]: https://github.com/rust-lang/rust/pull/57809/
1670 [57873]: https://github.com/rust-lang/rust/pull/57873/
1671 [57604]: https://github.com/rust-lang/rust/pull/57604/
1672 [57367]: https://github.com/rust-lang/rust/pull/57367/
1673 [57407]: https://github.com/rust-lang/rust/pull/57407/
1674 [57425]: https://github.com/rust-lang/rust/pull/57425/
1675 [57106]: https://github.com/rust-lang/rust/pull/57106/
1676 [56470]: https://github.com/rust-lang/rust/pull/56470/
1677 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1678 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1679 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1680 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1681 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1682 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1683 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1684 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1685 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1686 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1687 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1688 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1689 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1690 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1691 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1692 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1693 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1694 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1695 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1696 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1697 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1698 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1699 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1700 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1701 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1702 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1703 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1704 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1705 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1706 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1707 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1710 Version 1.33.0 (2019-02-28)
1711 ==========================
1715 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1716 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1717 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1718 E.g. You can have match statement on a `u8` that covers `0..=255` and
1719 you would no longer be required to have a `_ => unreachable!()` case.
1720 - [You can now have multiple patterns in `if let` and `while let`
1721 expressions.][57532] You can do this with the same syntax as a `match`
1731 let state = Creature::Crab("Ferris");
1733 if let Creature::Crab(name) | Creature::Person(name) = state {
1734 println!("This creature's name is: {}", name);
1738 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1739 this feature will by default produce a warning as this behaviour can be
1740 unintuitive. E.g. `if let _ = 5 {}`
1741 - [You can now use `let` bindings, assignments, expression statements,
1742 and irrefutable pattern destructuring in const functions.][57175]
1743 - [You can now call unsafe const functions.][57067] E.g.
1745 const unsafe fn foo() -> i32 { 5 }
1746 const fn bar() -> i32 {
1750 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1751 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1752 - [You can now specify a specific alignment with the `#[repr(packed)]`
1753 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1754 with an alignment of 2 bytes and a size of 6 bytes.
1755 - [You can now import an item from a module as an `_`.][56303] This allows you to
1756 import a trait's impls, and not have the name in the namespace. E.g.
1758 use std::io::Read as _;
1760 // Allowed as there is only one `Read` in the module.
1763 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1767 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1768 command line argument.][56351]
1769 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1770 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1771 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1772 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1773 information on Rust's platform support.
1774 - [Added support for the `thumbv7neon-linux-androideabi` and
1775 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1776 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1780 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1781 functions for all numeric types.][57566]
1782 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1783 are now `const` functions for all numeric types.][57105]
1784 - [The methods `is_positive` and `is_negative` are now `const` functions for
1785 all signed numeric types.][57105]
1786 - [The `get` method for all `NonZero` types is now `const`.][57167]
1787 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1788 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1789 numeric types.][57234]
1790 - [`Ipv4Addr::new` is now a `const` function][57234]
1794 - [`unix::FileExt::read_exact_at`]
1795 - [`unix::FileExt::write_all_at`]
1796 - [`Option::transpose`]
1797 - [`Result::transpose`]
1798 - [`convert::identity`]
1801 - [`marker::PhantomPinned`]
1802 - [`Vec::resize_with`]
1803 - [`VecDeque::resize_with`]
1804 - [`Duration::as_millis`]
1805 - [`Duration::as_micros`]
1806 - [`Duration::as_nanos`]
1811 - [You can now publish crates that require a feature flag to compile with
1812 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1813 - [Cargo should now rebuild a crate if a file was modified during the initial
1818 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1819 are now deprecated in the standard library, and their usage will now produce a warning.
1820 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1822 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1824 - [Libtest no longer creates a new thread for each test when
1825 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1827 [55982]: https://github.com/rust-lang/rust/pull/55982/
1828 [56243]: https://github.com/rust-lang/rust/pull/56243
1829 [56303]: https://github.com/rust-lang/rust/pull/56303/
1830 [56351]: https://github.com/rust-lang/rust/pull/56351/
1831 [56362]: https://github.com/rust-lang/rust/pull/56362
1832 [56642]: https://github.com/rust-lang/rust/pull/56642/
1833 [56769]: https://github.com/rust-lang/rust/pull/56769/
1834 [56805]: https://github.com/rust-lang/rust/pull/56805
1835 [56947]: https://github.com/rust-lang/rust/pull/56947/
1836 [57049]: https://github.com/rust-lang/rust/pull/57049/
1837 [57067]: https://github.com/rust-lang/rust/pull/57067/
1838 [57105]: https://github.com/rust-lang/rust/pull/57105
1839 [57130]: https://github.com/rust-lang/rust/pull/57130/
1840 [57167]: https://github.com/rust-lang/rust/pull/57167/
1841 [57175]: https://github.com/rust-lang/rust/pull/57175/
1842 [57234]: https://github.com/rust-lang/rust/pull/57234/
1843 [57332]: https://github.com/rust-lang/rust/pull/57332/
1844 [57465]: https://github.com/rust-lang/rust/pull/57465/
1845 [57532]: https://github.com/rust-lang/rust/pull/57532/
1846 [57535]: https://github.com/rust-lang/rust/pull/57535/
1847 [57566]: https://github.com/rust-lang/rust/pull/57566/
1848 [57615]: https://github.com/rust-lang/rust/pull/57615/
1849 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1850 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1851 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1852 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1853 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1854 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1855 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1856 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1857 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1858 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1859 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1860 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1861 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1862 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1863 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1864 [platform-support]: https://forge.rust-lang.org/platform-support.html
1866 Version 1.32.0 (2019-01-17)
1867 ==========================
1872 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1873 operator allows you to specify zero or one repetitions similar to the `*` and
1875 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1876 now always resolve to the item (`enum`, `struct`, etc.) available in the
1877 module if present, before resolving to a external crate or an item the prelude.][56759]
1880 enum Color { Red, Green, Blue }
1886 - [You can now match against `PhantomData<T>` types.][55837]
1887 - [You can now match against literals in macros with the `literal`
1888 specifier.][56072] This will match against a literal of any type.
1889 E.g. `1`, `'A'`, `"Hello World"`
1890 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1892 struct Point(i32, i32);
1895 pub fn new(x: i32, y: i32) -> Self {
1899 pub fn is_origin(&self) -> bool {
1907 - [Self can also now be used in type definitions.][56366] E.g.
1911 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1914 Cons(T, Box<Self>) // likewise here
1917 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1918 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1922 - [The default allocator has changed from jemalloc to the default allocator on
1923 your system.][55238] The compiler itself on Linux & macOS will still use
1924 jemalloc, but programs compiled with it will use the system allocator.
1925 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1929 - [`PathBuf` now implements `FromStr`.][55148]
1930 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1931 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1932 easily debug expressions in your rust program. E.g.
1935 let b = dbg!(a * 2) + 1;
1936 // ^-- prints: [src/main.rs:4] a * 2 = 4
1940 The following APIs are now `const` functions and can be used in a
1944 - [`UnsafeCell::get`]
1945 - [`char::is_ascii`]
1947 - [`ManuallyDrop::new`]
1948 - [`ManuallyDrop::into_inner`]
1949 - [`RangeInclusive::start`]
1950 - [`RangeInclusive::end`]
1951 - [`NonNull::as_ptr`]
1954 - [`Duration::as_secs`]
1955 - [`Duration::subsec_millis`]
1956 - [`Duration::subsec_micros`]
1957 - [`Duration::subsec_nanos`]
1959 - [`Ipv4Addr::is_unspecified`]
1961 - [`Ipv6Addr::octets`]
1965 - [`i8::to_be_bytes`]
1966 - [`i8::to_le_bytes`]
1967 - [`i8::to_ne_bytes`]
1968 - [`i8::from_be_bytes`]
1969 - [`i8::from_le_bytes`]
1970 - [`i8::from_ne_bytes`]
1971 - [`i16::to_be_bytes`]
1972 - [`i16::to_le_bytes`]
1973 - [`i16::to_ne_bytes`]
1974 - [`i16::from_be_bytes`]
1975 - [`i16::from_le_bytes`]
1976 - [`i16::from_ne_bytes`]
1977 - [`i32::to_be_bytes`]
1978 - [`i32::to_le_bytes`]
1979 - [`i32::to_ne_bytes`]
1980 - [`i32::from_be_bytes`]
1981 - [`i32::from_le_bytes`]
1982 - [`i32::from_ne_bytes`]
1983 - [`i64::to_be_bytes`]
1984 - [`i64::to_le_bytes`]
1985 - [`i64::to_ne_bytes`]
1986 - [`i64::from_be_bytes`]
1987 - [`i64::from_le_bytes`]
1988 - [`i64::from_ne_bytes`]
1989 - [`i128::to_be_bytes`]
1990 - [`i128::to_le_bytes`]
1991 - [`i128::to_ne_bytes`]
1992 - [`i128::from_be_bytes`]
1993 - [`i128::from_le_bytes`]
1994 - [`i128::from_ne_bytes`]
1995 - [`isize::to_be_bytes`]
1996 - [`isize::to_le_bytes`]
1997 - [`isize::to_ne_bytes`]
1998 - [`isize::from_be_bytes`]
1999 - [`isize::from_le_bytes`]
2000 - [`isize::from_ne_bytes`]
2001 - [`u8::to_be_bytes`]
2002 - [`u8::to_le_bytes`]
2003 - [`u8::to_ne_bytes`]
2004 - [`u8::from_be_bytes`]
2005 - [`u8::from_le_bytes`]
2006 - [`u8::from_ne_bytes`]
2007 - [`u16::to_be_bytes`]
2008 - [`u16::to_le_bytes`]
2009 - [`u16::to_ne_bytes`]
2010 - [`u16::from_be_bytes`]
2011 - [`u16::from_le_bytes`]
2012 - [`u16::from_ne_bytes`]
2013 - [`u32::to_be_bytes`]
2014 - [`u32::to_le_bytes`]
2015 - [`u32::to_ne_bytes`]
2016 - [`u32::from_be_bytes`]
2017 - [`u32::from_le_bytes`]
2018 - [`u32::from_ne_bytes`]
2019 - [`u64::to_be_bytes`]
2020 - [`u64::to_le_bytes`]
2021 - [`u64::to_ne_bytes`]
2022 - [`u64::from_be_bytes`]
2023 - [`u64::from_le_bytes`]
2024 - [`u64::from_ne_bytes`]
2025 - [`u128::to_be_bytes`]
2026 - [`u128::to_le_bytes`]
2027 - [`u128::to_ne_bytes`]
2028 - [`u128::from_be_bytes`]
2029 - [`u128::from_le_bytes`]
2030 - [`u128::from_ne_bytes`]
2031 - [`usize::to_be_bytes`]
2032 - [`usize::to_le_bytes`]
2033 - [`usize::to_ne_bytes`]
2034 - [`usize::from_be_bytes`]
2035 - [`usize::from_le_bytes`]
2036 - [`usize::from_ne_bytes`]
2040 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2041 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2045 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2049 - [The argument types for AVX's
2050 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2051 been changed from `*const` to `*mut` as the previous implementation
2055 [55148]: https://github.com/rust-lang/rust/pull/55148/
2056 [55238]: https://github.com/rust-lang/rust/pull/55238/
2057 [55280]: https://github.com/rust-lang/rust/pull/55280/
2058 [55610]: https://github.com/rust-lang/rust/pull/55610/
2059 [55663]: https://github.com/rust-lang/rust/pull/55663/
2060 [55702]: https://github.com/rust-lang/rust/pull/55702/
2061 [55837]: https://github.com/rust-lang/rust/pull/55837/
2062 [55843]: https://github.com/rust-lang/rust/pull/55843/
2063 [56072]: https://github.com/rust-lang/rust/pull/56072/
2064 [56245]: https://github.com/rust-lang/rust/pull/56245/
2065 [56365]: https://github.com/rust-lang/rust/pull/56365/
2066 [56366]: https://github.com/rust-lang/rust/pull/56366/
2067 [56395]: https://github.com/rust-lang/rust/pull/56395/
2068 [56759]: https://github.com/rust-lang/rust/pull/56759/
2069 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2070 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2071 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2072 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2073 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2074 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2075 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2076 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2077 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2078 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2079 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2080 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2081 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2082 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2083 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2084 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2085 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2086 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2087 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2088 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2089 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2090 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2091 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2092 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2093 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2094 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2095 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2096 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2097 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2098 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2099 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2100 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2101 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2102 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2103 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2104 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2105 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2106 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2107 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2108 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2109 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2110 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2111 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2112 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2113 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2114 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2115 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2116 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2117 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2118 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2119 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2120 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2121 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2122 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2123 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2124 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2125 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2126 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2127 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2128 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2129 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2130 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2131 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2132 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2133 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2134 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2135 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2136 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2137 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2138 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2139 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2140 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2141 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2142 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2143 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2144 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2145 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2146 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2147 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2148 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2149 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2150 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2151 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2152 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2153 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2154 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2155 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2156 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2157 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2158 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2159 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2160 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2161 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2164 Version 1.31.1 (2018-12-20)
2165 ===========================
2167 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2168 - [Fix broken go-to-definition in RLS][rls/1171]
2169 - [Fix infinite loop on hover in RLS][rls/1170]
2171 [56562]: https://github.com/rust-lang/rust/pull/56562
2172 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2173 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2175 Version 1.31.0 (2018-12-06)
2176 ==========================
2180 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2181 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2182 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2183 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2185 - [You can now define and use `const` functions.][54835] These are currently
2186 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2187 [language reference][const-reference] for what exactly is available.
2188 - [You can now use tool lints, which allow you to scope lints from external
2189 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2190 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2191 a crate, not just in exported functions.][54451]
2192 - [You can now use parentheses in pattern matches.][54497]
2196 - [Updated musl to 1.1.20][54430]
2200 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2201 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2202 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2203 into `Option<&mut T>` using the `From` trait.][53218]
2204 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2209 - [`slice::align_to`]
2210 - [`slice::align_to_mut`]
2211 - [`slice::chunks_exact`]
2212 - [`slice::chunks_exact_mut`]
2213 - [`slice::rchunks`]
2214 - [`slice::rchunks_mut`]
2215 - [`slice::rchunks_exact`]
2216 - [`slice::rchunks_exact_mut`]
2217 - [`Option::replace`]
2221 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2222 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2223 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2225 [52813]: https://github.com/rust-lang/rust/pull/52813/
2226 [53218]: https://github.com/rust-lang/rust/pull/53218/
2227 [53555]: https://github.com/rust-lang/rust/issues/53555/
2228 [54057]: https://github.com/rust-lang/rust/pull/54057/
2229 [54240]: https://github.com/rust-lang/rust/pull/54240/
2230 [54430]: https://github.com/rust-lang/rust/pull/54430/
2231 [54451]: https://github.com/rust-lang/rust/pull/54451/
2232 [54497]: https://github.com/rust-lang/rust/pull/54497/
2233 [54778]: https://github.com/rust-lang/rust/pull/54778/
2234 [54835]: https://github.com/rust-lang/rust/pull/54835/
2235 [54870]: https://github.com/rust-lang/rust/pull/54870/
2236 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2237 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2238 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2239 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2240 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2241 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2242 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2243 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2244 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2245 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2246 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2247 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2248 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2249 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2251 Version 1.30.1 (2018-11-08)
2252 ===========================
2254 - [Fixed overflow ICE in rustdoc][54199]
2255 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2257 [54199]: https://github.com/rust-lang/rust/pull/54199
2258 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2260 Version 1.30.0 (2018-10-25)
2261 ==========================
2265 - [Procedural macros are now available.][52081] These kinds of macros allow for
2266 more powerful code generation. There is a [new chapter available][proc-macros]
2267 in the Rust Programming Language book that goes further in depth.
2268 - [You can now use keywords as identifiers using the raw identifiers
2269 syntax (`r#`),][53236] e.g. `let r#for = true;`
2270 - [Using anonymous parameters in traits is now deprecated with a warning and
2271 will be a hard error in the 2018 edition.][53272]
2272 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2273 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2274 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2275 Previously, using a external crate in a module without a use statement
2276 required `let json = ::serde_json::from_str(foo);` but can now be written
2277 as `let json = serde_json::from_str(foo);`.
2278 - [You can now apply the `#[used]` attribute to static items to prevent the
2279 compiler from optimising them away, even if they appear to be unused,][51363]
2280 e.g. `#[used] static FOO: u32 = 1;`
2281 - [You can now import and reexport macros from other crates with the `use`
2282 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2283 the root module of the crate. If your macro relies on calling other local
2284 macros, it is recommended to export with the
2285 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2287 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2288 using the `vis` specifier.][53370]
2289 - [Non-macro attributes now allow all forms of literals, not just
2290 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2291 write `#[attr(true)]`.
2292 - [You can now specify a function to handle a panic in the Rust runtime with the
2293 `#[panic_handler]` attribute.][51366]
2297 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2298 - [Added the `aarch64-unknown-netbsd` target][53165]
2302 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2306 - [`Ipv4Addr::BROADCAST`]
2307 - [`Ipv4Addr::LOCALHOST`]
2308 - [`Ipv4Addr::UNSPECIFIED`]
2309 - [`Ipv6Addr::LOCALHOST`]
2310 - [`Ipv6Addr::UNSPECIFIED`]
2311 - [`Iterator::find_map`]
2313 The following methods are replacement methods for `trim_left`, `trim_right`,
2314 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2316 - [`str::trim_end_matches`]
2318 - [`str::trim_start_matches`]
2319 - [`str::trim_start`]
2323 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2324 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2325 equivalent to calling `rustdoc --error-format=json`.
2326 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2330 - [`rustdoc` allows you to specify what edition to treat your code as with the
2331 `--edition` option.][54057]
2332 - [`rustdoc` now has the `--color` (specify whether to output color) and
2333 `--error-format` (specify error format, e.g. `json`) options.][53003]
2334 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2335 debug symbols.][53774]
2336 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2337 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2339 [50911]: https://github.com/rust-lang/rust/pull/50911/
2340 [51363]: https://github.com/rust-lang/rust/pull/51363/
2341 [51366]: https://github.com/rust-lang/rust/pull/51366/
2342 [52081]: https://github.com/rust-lang/rust/pull/52081/
2343 [53003]: https://github.com/rust-lang/rust/pull/53003/
2344 [53033]: https://github.com/rust-lang/rust/pull/53033/
2345 [53044]: https://github.com/rust-lang/rust/pull/53044/
2346 [53165]: https://github.com/rust-lang/rust/pull/53165/
2347 [53213]: https://github.com/rust-lang/rust/pull/53213/
2348 [53236]: https://github.com/rust-lang/rust/pull/53236/
2349 [53272]: https://github.com/rust-lang/rust/pull/53272/
2350 [53370]: https://github.com/rust-lang/rust/pull/53370/
2351 [53459]: https://github.com/rust-lang/rust/pull/53459/
2352 [53774]: https://github.com/rust-lang/rust/pull/53774/
2353 [53822]: https://github.com/rust-lang/rust/pull/53822/
2354 [54057]: https://github.com/rust-lang/rust/pull/54057/
2355 [54146]: https://github.com/rust-lang/rust/pull/54146/
2356 [54404]: https://github.com/rust-lang/rust/pull/54404/
2357 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2358 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2359 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2360 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2362 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2363 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2364 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2365 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2366 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2367 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2368 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2369 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2370 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2371 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2374 Version 1.29.2 (2018-10-11)
2375 ===========================
2377 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2378 - The `rls-preview` component on the windows-gnu targets has been restored.
2380 [54639]: https://github.com/rust-lang/rust/pull/54639
2383 Version 1.29.1 (2018-09-25)
2384 ===========================
2389 - The standard library's `str::repeat` function contained an out of bounds write
2390 caused by an integer overflow. This has been fixed by deterministically
2391 panicking when an overflow happens.
2393 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2397 Version 1.29.0 (2018-09-13)
2398 ==========================
2402 - [Bumped minimum LLVM version to 5.0.][51899]
2403 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2404 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2408 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2409 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2410 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2411 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2413 - [`Cell<T>` now allows `T` to be unsized.][50494]
2414 - [`SocketAddr` is now stable on Redox.][52656]
2419 - [`Iterator::flatten`]
2424 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2425 `--locked` to disable this behavior.
2426 - [`cargo-install` will now allow you to cross compile an install
2427 using `--target`.][cargo/5614]
2428 - [Added the `cargo-fix` subcommand to automatically move project code from
2429 2015 edition to 2018.][cargo/5723]
2430 - [`cargo doc` can now optionally document private types using the
2431 `--document-private-items` flag.][cargo/5543]
2435 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2436 the specified level to that level.][52354] For example `--cap-lints warn`
2437 will demote `deny` and `forbid` lints to `warn`.
2438 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2439 fails and `101` if there is a panic.][52197]
2440 - [A preview of clippy has been made available through rustup.][51122]
2441 You can install the preview with `rustup component add clippy-preview`.
2445 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2446 Use `str::get_unchecked(begin..end)` instead.
2447 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2448 Consider using the `home_dir` function from
2449 https://crates.io/crates/dirs instead.
2450 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2451 - [`cfg` attributes and `--cfg` command line flags are now more
2452 strictly validated.][53893]
2454 [53893]: https://github.com/rust-lang/rust/pull/53893/
2455 [52861]: https://github.com/rust-lang/rust/pull/52861/
2456 [52656]: https://github.com/rust-lang/rust/pull/52656/
2457 [52239]: https://github.com/rust-lang/rust/pull/52239/
2458 [52330]: https://github.com/rust-lang/rust/pull/52330/
2459 [52354]: https://github.com/rust-lang/rust/pull/52354/
2460 [52402]: https://github.com/rust-lang/rust/pull/52402/
2461 [52103]: https://github.com/rust-lang/rust/pull/52103/
2462 [52197]: https://github.com/rust-lang/rust/pull/52197/
2463 [51807]: https://github.com/rust-lang/rust/pull/51807/
2464 [51899]: https://github.com/rust-lang/rust/pull/51899/
2465 [51912]: https://github.com/rust-lang/rust/pull/51912/
2466 [51511]: https://github.com/rust-lang/rust/pull/51511/
2467 [51619]: https://github.com/rust-lang/rust/pull/51619/
2468 [51656]: https://github.com/rust-lang/rust/pull/51656/
2469 [51178]: https://github.com/rust-lang/rust/pull/51178/
2470 [51122]: https://github.com/rust-lang/rust/pull/51122
2471 [50494]: https://github.com/rust-lang/rust/pull/50494/
2472 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2473 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2474 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2475 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2476 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2477 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2478 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2481 Version 1.28.0 (2018-08-02)
2482 ===========================
2486 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2487 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2488 the inner type across Foreign Function Interface (FFI) boundaries.
2489 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2490 and can now be used as identifiers.][51196]
2491 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2492 stable.][51241] This will allow users to specify a global allocator for
2494 - [Unit test functions marked with the `#[test]` attribute can now return
2495 `Result<(), E: Debug>` in addition to `()`.][51298]
2496 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2497 allows macros to easily target lifetimes.
2501 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2502 prioritise making smaller binary sizes. `z` is the same as `s` with the
2503 exception that it does not vectorise loops, which typically results in an even
2505 - [The short error format is now stable.][49546] Specified with
2506 `--error-format=short` this option will provide a more compressed output of
2507 rust error messages.
2508 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2509 - [Reduced the number of allocations in the macro parser.][50855] This can
2510 improve compile times of macro heavy crates on average by 5%.
2514 - [Implemented `Default` for `&mut str`.][51306]
2515 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2516 - [Implemented `Extend` for `()`.][50234]
2517 - [The `Debug` implementation of `time::Duration` should now be more easily
2518 human readable.][50364] Previously a `Duration` of one second would printed as
2519 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2520 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2521 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2522 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2523 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2524 for `PathBuf`.][50170]
2525 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2526 and `Wrapping<i128>`.][50465]
2527 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2528 possible.][51050] This can provide up to a 40% speed increase.
2529 - [Improved error messages when using `format!`.][50610]
2533 - [`Iterator::step_by`]
2534 - [`Path::ancestors`]
2535 - [`SystemTime::UNIX_EPOCH`]
2536 - [`alloc::GlobalAlloc`]
2538 - [`alloc::LayoutErr`]
2541 - [`alloc::alloc_zeroed`]
2542 - [`alloc::dealloc`]
2543 - [`alloc::realloc`]
2544 - [`alloc::handle_alloc_error`]
2545 - [`btree_map::Entry::or_default`]
2546 - [`fmt::Alignment`]
2547 - [`hash_map::Entry::or_default`]
2548 - [`iter::repeat_with`]
2549 - [`num::NonZeroUsize`]
2550 - [`num::NonZeroU128`]
2551 - [`num::NonZeroU16`]
2552 - [`num::NonZeroU32`]
2553 - [`num::NonZeroU64`]
2554 - [`num::NonZeroU8`]
2555 - [`ops::RangeBounds`]
2556 - [`slice::SliceIndex`]
2557 - [`slice::from_mut`]
2558 - [`slice::from_ref`]
2559 - [`{Any + Send + Sync}::downcast_mut`]
2560 - [`{Any + Send + Sync}::downcast_ref`]
2561 - [`{Any + Send + Sync}::is`]
2565 - [Cargo will now no longer allow you to publish crates with build scripts that
2566 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2567 considered to be immutable.
2571 - [The `suggestion_applicability` field in `rustc`'s json output is now
2572 stable.][50486] This will allow dev tools to check whether a code suggestion
2573 would apply to them.
2577 - [Rust will consider trait objects with duplicated constraints to be the same
2578 type as without the duplicated constraint.][51276] For example the below code will
2579 now fail to compile.
2584 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2587 impl Trait + Send + Send {
2588 fn test(&self) { println!("two"); }
2592 [49546]: https://github.com/rust-lang/rust/pull/49546/
2593 [50143]: https://github.com/rust-lang/rust/pull/50143/
2594 [50170]: https://github.com/rust-lang/rust/pull/50170/
2595 [50234]: https://github.com/rust-lang/rust/pull/50234/
2596 [50265]: https://github.com/rust-lang/rust/pull/50265/
2597 [50364]: https://github.com/rust-lang/rust/pull/50364/
2598 [50385]: https://github.com/rust-lang/rust/pull/50385/
2599 [50465]: https://github.com/rust-lang/rust/pull/50465/
2600 [50486]: https://github.com/rust-lang/rust/pull/50486/
2601 [50554]: https://github.com/rust-lang/rust/pull/50554/
2602 [50610]: https://github.com/rust-lang/rust/pull/50610/
2603 [50855]: https://github.com/rust-lang/rust/pull/50855/
2604 [51050]: https://github.com/rust-lang/rust/pull/51050/
2605 [51196]: https://github.com/rust-lang/rust/pull/51196/
2606 [51200]: https://github.com/rust-lang/rust/pull/51200/
2607 [51241]: https://github.com/rust-lang/rust/pull/51241/
2608 [51276]: https://github.com/rust-lang/rust/pull/51276/
2609 [51298]: https://github.com/rust-lang/rust/pull/51298/
2610 [51306]: https://github.com/rust-lang/rust/pull/51306/
2611 [51562]: https://github.com/rust-lang/rust/pull/51562/
2612 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2613 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2614 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2615 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2616 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2617 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2618 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2619 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2620 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2621 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2622 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2623 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2624 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2625 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2626 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2627 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2628 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2629 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2630 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2631 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2632 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2633 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2634 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2635 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2636 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2637 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2638 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2639 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2640 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2641 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2643 Version 1.27.2 (2018-07-20)
2644 ===========================
2649 - The borrow checker was fixed to avoid potential unsoundness when using
2650 match ergonomics: [#52213][52213].
2652 [52213]: https://github.com/rust-lang/rust/issues/52213
2654 Version 1.27.1 (2018-07-10)
2655 ===========================
2660 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2661 when running, which enabled executing code as some other user on a
2662 given machine. This release fixes that vulnerability; you can read
2663 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2665 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2670 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2671 match ergonomics: [#51415][51415], [#49534][49534].
2673 [51415]: https://github.com/rust-lang/rust/issues/51415
2674 [49534]: https://github.com/rust-lang/rust/issues/49534
2675 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2676 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2678 Version 1.27.0 (2018-06-21)
2679 ==========================
2683 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2684 be used as an identifier.
2685 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2686 bare `Trait` syntax, and should make it clearer when being used in tandem with
2687 `impl Trait` because it is equivalent to the following syntax:
2688 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2689 `Box<Trait> == Box<dyn Trait>`.
2690 - [Attributes on generic parameters such as types and lifetimes are
2691 now stable.][48851] e.g.
2692 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2693 - [The `#[must_use]` attribute can now also be used on functions as well as
2694 types.][48925] It provides a lint that by default warns users when the
2695 value returned by a function has not been used.
2699 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2703 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2704 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2705 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2706 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2707 the `cfg` attribute.
2708 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2709 std are now available in core.][49896]
2710 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2712 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2713 that the operation isn't done in place.
2714 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2715 the `#[must_use]` attribute][49533] to warn about unused potentially
2716 expensive allocations.
2720 - [`DoubleEndedIterator::rfind`]
2721 - [`DoubleEndedIterator::rfold`]
2722 - [`DoubleEndedIterator::try_rfold`]
2723 - [`Duration::from_micros`]
2724 - [`Duration::from_nanos`]
2725 - [`Duration::subsec_micros`]
2726 - [`Duration::subsec_millis`]
2727 - [`HashMap::remove_entry`]
2728 - [`Iterator::try_fold`]
2729 - [`Iterator::try_for_each`]
2731 - [`Option::filter`]
2732 - [`String::replace_range`]
2733 - [`Take::set_limit`]
2734 - [`hint::unreachable_unchecked`]
2735 - [`os::unix::process::parent_id`]
2736 - [`ptr::swap_nonoverlapping`]
2737 - [`slice::rsplit_mut`]
2739 - [`slice::swap_with_slice`]
2743 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2744 `readme`, and `repository` fields.][cargo/5386]
2745 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2746 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2747 a different directory than `target` for placing compilation artifacts.
2748 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2749 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2750 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2751 where cargo would infer a binary, Cargo will produce a warning. You can
2752 disable this feature ahead of time by setting any of the following to false:
2753 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2754 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2755 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2759 - [Added “The Rustc book” into the official documentation.][49707]
2760 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2761 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2765 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2766 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2767 compile, `"".is_empty()` will still compile.
2768 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2769 will only print the inner type.][48553] E.g.
2770 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2771 not `AtomicBool(true)`.
2772 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2773 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2774 alignment should cover all use cases.
2775 - The `.description()` method on the `std::error::Error` trait
2776 [has been soft-deprecated][50163]. It is no longer required to implement it.
2778 [48553]: https://github.com/rust-lang/rust/pull/48553/
2779 [48851]: https://github.com/rust-lang/rust/pull/48851/
2780 [48925]: https://github.com/rust-lang/rust/pull/48925/
2781 [49533]: https://github.com/rust-lang/rust/pull/49533/
2782 [49623]: https://github.com/rust-lang/rust/pull/49623/
2783 [49630]: https://github.com/rust-lang/rust/pull/49630/
2784 [49664]: https://github.com/rust-lang/rust/pull/49664/
2785 [49699]: https://github.com/rust-lang/rust/pull/49699/
2786 [49707]: https://github.com/rust-lang/rust/pull/49707/
2787 [49719]: https://github.com/rust-lang/rust/pull/49719/
2788 [49896]: https://github.com/rust-lang/rust/pull/49896/
2789 [49968]: https://github.com/rust-lang/rust/pull/49968/
2790 [50163]: https://github.com/rust-lang/rust/pull/50163
2791 [50177]: https://github.com/rust-lang/rust/pull/50177/
2792 [50378]: https://github.com/rust-lang/rust/pull/50378/
2793 [50398]: https://github.com/rust-lang/rust/pull/50398/
2794 [50423]: https://github.com/rust-lang/rust/pull/50423/
2795 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2796 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2797 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2798 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2799 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2800 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2801 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2802 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2803 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2804 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2805 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2806 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2807 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2808 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2809 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2810 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2811 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2812 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2813 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2814 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2815 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2816 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2817 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2818 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2819 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2820 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2821 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2822 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2823 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2824 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2827 Version 1.26.2 (2018-06-05)
2828 ==========================
2833 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2835 [51117]: https://github.com/rust-lang/rust/issues/51117
2838 Version 1.26.1 (2018-05-29)
2839 ==========================
2844 - [RLS now works on Windows.][50646]
2845 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2851 - [`fn main() -> impl Trait` no longer works for non-Termination
2853 This reverts an accidental stabilization.
2854 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2855 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2857 [50646]: https://github.com/rust-lang/rust/issues/50646
2858 [50656]: https://github.com/rust-lang/rust/pull/50656
2859 [50812]: https://github.com/rust-lang/rust/pull/50812
2860 [50950]: https://github.com/rust-lang/rust/issues/50950
2861 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2863 Version 1.26.0 (2018-05-10)
2864 ==========================
2868 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2869 implement either or both traits.][49299]
2870 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2871 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2872 lifetime can be elided.][49458]
2873 - [`impl Trait` is now stable allowing you to have abstract types in returns
2874 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2875 `fn open(path: impl AsRef<Path>)`.
2876 - [Pattern matching will now automatically apply dereferences.][49394]
2877 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2878 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2879 - [A lot of operations are now available in a const context.][46882] E.g. You
2880 can now index into constant arrays, reference and dereference into constants,
2881 and use tuple struct constructors.
2882 - [Fixed entry slice patterns are now stable.][48516] E.g.
2884 let points = [1, 2, 3, 4];
2886 [1, 2, 3, 4] => println!("All points were sequential."),
2887 _ => println!("Not all points were sequential."),
2894 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2895 - [Fixed exponential projection complexity on nested types.][48296]
2896 This can provide up to a ~12% reduction in compile times for certain crates.
2897 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2898 to remap path prefixes outputted by the compiler.
2899 - [Added `powerpc-unknown-netbsd` target.][48281]
2903 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2904 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2905 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2906 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2907 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2908 - [`ascii::escape_default` is now available in libcore.][48735]
2909 - [Trailing commas are now supported in std and core macros.][48056]
2910 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2911 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2916 - [`*const T::copy_to_nonoverlapping`]
2917 - [`*const T::copy_to`]
2918 - [`*const T::read_unaligned`]
2919 - [`*const T::read_volatile`]
2920 - [`*const T::read`]
2922 - [`*const T::wrapping_add`]
2923 - [`*const T::wrapping_sub`]
2925 - [`*mut T::copy_to_nonoverlapping`]
2926 - [`*mut T::copy_to`]
2927 - [`*mut T::read_unaligned`]
2928 - [`*mut T::read_volatile`]
2930 - [`*mut T::replace`]
2933 - [`*mut T::wrapping_add`]
2934 - [`*mut T::wrapping_sub`]
2935 - [`*mut T::write_bytes`]
2936 - [`*mut T::write_unaligned`]
2937 - [`*mut T::write_volatile`]
2940 - [`FromUtf8Error::as_bytes`]
2941 - [`LocalKey::try_with`]
2942 - [`Option::cloned`]
2943 - [`btree_map::Entry::and_modify`]
2944 - [`fs::read_to_string`]
2947 - [`hash_map::Entry::and_modify`]
2948 - [`iter::FusedIterator`]
2949 - [`ops::RangeInclusive`]
2950 - [`ops::RangeToInclusive`]
2952 - [`slice::rotate_left`]
2953 - [`slice::rotate_right`]
2954 - [`String::retain`]
2959 - [Cargo will now output path to custom commands when `-v` is
2960 passed with `--list`][cargo/5041]
2961 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2965 - [The second edition of "The Rust Programming Language" book is now recommended
2966 over the first.][48404]
2971 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2972 syntax is now invalid.
2974 use std::ops::Fn as dyn;
2975 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2977 - [The result of dereferences are no longer promoted to `'static`.][47408]
2981 const PAIR: &(i32, i32) = &(0, 1);
2982 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2985 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2986 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2988 - [Removed hoedown from rustdoc.][48274]
2989 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2991 [46882]: https://github.com/rust-lang/rust/pull/46882
2992 [47379]: https://github.com/rust-lang/rust/pull/47379
2993 [47408]: https://github.com/rust-lang/rust/pull/47408
2994 [47813]: https://github.com/rust-lang/rust/pull/47813
2995 [48056]: https://github.com/rust-lang/rust/pull/48056
2996 [48125]: https://github.com/rust-lang/rust/pull/48125
2997 [48166]: https://github.com/rust-lang/rust/pull/48166
2998 [48235]: https://github.com/rust-lang/rust/pull/48235
2999 [48274]: https://github.com/rust-lang/rust/pull/48274
3000 [48281]: https://github.com/rust-lang/rust/pull/48281
3001 [48296]: https://github.com/rust-lang/rust/pull/48296
3002 [48326]: https://github.com/rust-lang/rust/pull/48326
3003 [48359]: https://github.com/rust-lang/rust/pull/48359
3004 [48404]: https://github.com/rust-lang/rust/pull/48404
3005 [48481]: https://github.com/rust-lang/rust/pull/48481
3006 [48516]: https://github.com/rust-lang/rust/pull/48516
3007 [48628]: https://github.com/rust-lang/rust/pull/48628
3008 [48629]: https://github.com/rust-lang/rust/pull/48629
3009 [48657]: https://github.com/rust-lang/rust/pull/48657
3010 [48735]: https://github.com/rust-lang/rust/pull/48735
3011 [48978]: https://github.com/rust-lang/rust/pull/48978
3012 [49101]: https://github.com/rust-lang/rust/pull/49101
3013 [49109]: https://github.com/rust-lang/rust/pull/49109
3014 [49121]: https://github.com/rust-lang/rust/pull/49121
3015 [49162]: https://github.com/rust-lang/rust/pull/49162
3016 [49184]: https://github.com/rust-lang/rust/pull/49184
3017 [49234]: https://github.com/rust-lang/rust/pull/49234
3018 [49255]: https://github.com/rust-lang/rust/pull/49255
3019 [49299]: https://github.com/rust-lang/rust/pull/49299
3020 [49305]: https://github.com/rust-lang/rust/pull/49305
3021 [49394]: https://github.com/rust-lang/rust/pull/49394
3022 [49458]: https://github.com/rust-lang/rust/pull/49458
3023 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3024 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3025 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3026 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3027 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3028 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3029 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3030 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3031 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3032 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3033 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3034 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3035 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3036 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3037 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3038 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3039 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3040 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3041 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3042 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3043 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3044 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3045 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3046 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3047 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3048 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3049 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3050 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3051 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3052 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3053 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3054 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3055 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3056 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3057 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3058 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3059 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3060 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3061 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3062 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3063 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3064 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3067 Version 1.25.0 (2018-03-29)
3068 ==========================
3072 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3073 - [You can now use nested groups of imports.][47948]
3074 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3075 - [You can now have `|` at the start of a match arm.][47947] e.g.
3077 enum Foo { A, B, C }
3083 | Foo::B => println!("AB"),
3084 | Foo::C => println!("C"),
3091 - [Upgraded to LLVM 6.][47828]
3092 - [Added `-C lto=val` option.][47521]
3093 - [Added `i586-unknown-linux-musl` target][47282]
3097 - [Impl Send for `process::Command` on Unix.][47760]
3098 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3099 - [`UnsafeCell::into_inner` is now safe.][47204]
3100 - [Implement libstd for CloudABI.][47268]
3101 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3102 - [Implement `AsRef<Path>` for Component][46985]
3103 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3104 - [Moved `Duration` to libcore.][46666]
3108 - [`Location::column`]
3111 The following functions can now be used in a constant expression.
3112 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3113 - [`Duration::new`][47300]
3114 - [`Duration::from_secs`][47300]
3115 - [`Duration::from_millis`][47300]
3119 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3120 - [`cargo new` now defaults to creating a binary crate, instead of a
3121 library crate.][cargo/5029]
3125 - [Rust by example is now shipped with new releases][46196]
3129 - [Deprecated `net::lookup_host`.][47510]
3130 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3131 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3132 around indexing operations (see [#47349][47349]). This has been fixed (which also
3133 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3134 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3136 [33903]: https://github.com/rust-lang/rust/pull/33903
3137 [47947]: https://github.com/rust-lang/rust/pull/47947
3138 [47948]: https://github.com/rust-lang/rust/pull/47948
3139 [47760]: https://github.com/rust-lang/rust/pull/47760
3140 [47790]: https://github.com/rust-lang/rust/pull/47790
3141 [47828]: https://github.com/rust-lang/rust/pull/47828
3142 [47398]: https://github.com/rust-lang/rust/pull/47398
3143 [47510]: https://github.com/rust-lang/rust/pull/47510
3144 [47521]: https://github.com/rust-lang/rust/pull/47521
3145 [47204]: https://github.com/rust-lang/rust/pull/47204
3146 [47251]: https://github.com/rust-lang/rust/pull/47251
3147 [47268]: https://github.com/rust-lang/rust/pull/47268
3148 [47282]: https://github.com/rust-lang/rust/pull/47282
3149 [47300]: https://github.com/rust-lang/rust/pull/47300
3150 [47349]: https://github.com/rust-lang/rust/pull/47349
3151 [46931]: https://github.com/rust-lang/rust/pull/46931
3152 [46985]: https://github.com/rust-lang/rust/pull/46985
3153 [47006]: https://github.com/rust-lang/rust/pull/47006
3154 [46830]: https://github.com/rust-lang/rust/pull/46830
3155 [46095]: https://github.com/rust-lang/rust/pull/46095
3156 [46666]: https://github.com/rust-lang/rust/pull/46666
3157 [46196]: https://github.com/rust-lang/rust/pull/46196
3158 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3159 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3160 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3161 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3162 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3165 Version 1.24.1 (2018-03-01)
3166 ==========================
3168 - [Do not abort when unwinding through FFI][48251]
3169 - [Emit UTF-16 files for linker arguments on Windows][48318]
3170 - [Make the error index generator work again][48308]
3171 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3173 [48251]: https://github.com/rust-lang/rust/issues/48251
3174 [48308]: https://github.com/rust-lang/rust/issues/48308
3175 [48318]: https://github.com/rust-lang/rust/issues/48318
3176 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3179 Version 1.24.0 (2018-02-15)
3180 ==========================
3184 - [External `sysv64` ffi is now available.][46528]
3185 eg. `extern "sysv64" fn foo () {}`
3189 - [rustc now uses 16 codegen units by default for release builds.][46910]
3190 For the fastest builds, utilize `codegen-units=1`.
3191 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3192 - [Add `aarch64-unknown-openbsd` support][46760]
3196 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3197 improvement in performance in the majority of cases.
3198 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3199 with Windows.][46798]
3200 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3201 - [impl `From<bool>` for `AtomicBool`][46293]
3202 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3203 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3204 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3205 - [float::from_bits now just uses transmute.][46012] This provides
3206 some optimisations from LLVM.
3207 - [Copied `AsciiExt` methods onto `char`][46077]
3208 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3209 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3210 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3211 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3215 - [`RefCell::replace`]
3217 - [`atomic::spin_loop_hint`]
3219 The following functions can now be used in a constant expression.
3220 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3222 - [`AtomicBool::new`][46287]
3223 - [`AtomicUsize::new`][46287]
3224 - [`AtomicIsize::new`][46287]
3225 - [`AtomicPtr::new`][46287]
3226 - [`Cell::new`][46287]
3227 - [`{integer}::min_value`][46287]
3228 - [`{integer}::max_value`][46287]
3229 - [`mem::size_of`][46287]
3230 - [`mem::align_of`][46287]
3231 - [`ptr::null`][46287]
3232 - [`ptr::null_mut`][46287]
3233 - [`RefCell::new`][46287]
3234 - [`UnsafeCell::new`][46287]
3238 - [Added a `workspace.default-members` config that
3239 overrides implied `--all` in virtual workspaces.][cargo/4743]
3240 - [Enable incremental by default on development builds.][cargo/4817] Also added
3241 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3242 per-project or global basis respectively.
3249 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3250 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3251 in accordance with IETF RFC 4291 §2.2.
3252 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3253 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3254 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3255 - [Leading zeros in tuple struct members is now an error][47084]
3256 - [`column!()` macro is one-based instead of zero-based][46977]
3257 - [`fmt::Arguments` can no longer be shared across threads][45198]
3258 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3259 - [Cargo sets a different working directory for the compiler][cargo/4788]
3261 [44884]: https://github.com/rust-lang/rust/pull/44884
3262 [45198]: https://github.com/rust-lang/rust/pull/45198
3263 [45506]: https://github.com/rust-lang/rust/pull/45506
3264 [45904]: https://github.com/rust-lang/rust/pull/45904
3265 [45990]: https://github.com/rust-lang/rust/pull/45990
3266 [46012]: https://github.com/rust-lang/rust/pull/46012
3267 [46077]: https://github.com/rust-lang/rust/pull/46077
3268 [46094]: https://github.com/rust-lang/rust/pull/46094
3269 [46284]: https://github.com/rust-lang/rust/pull/46284
3270 [46287]: https://github.com/rust-lang/rust/pull/46287
3271 [46293]: https://github.com/rust-lang/rust/pull/46293
3272 [46528]: https://github.com/rust-lang/rust/pull/46528
3273 [46671]: https://github.com/rust-lang/rust/pull/46671
3274 [46713]: https://github.com/rust-lang/rust/pull/46713
3275 [46735]: https://github.com/rust-lang/rust/pull/46735
3276 [46749]: https://github.com/rust-lang/rust/pull/46749
3277 [46760]: https://github.com/rust-lang/rust/pull/46760
3278 [46798]: https://github.com/rust-lang/rust/pull/46798
3279 [46828]: https://github.com/rust-lang/rust/pull/46828
3280 [46831]: https://github.com/rust-lang/rust/pull/46831
3281 [46833]: https://github.com/rust-lang/rust/pull/46833
3282 [46910]: https://github.com/rust-lang/rust/pull/46910
3283 [46977]: https://github.com/rust-lang/rust/pull/46977
3284 [47018]: https://github.com/rust-lang/rust/pull/47018
3285 [47080]: https://github.com/rust-lang/rust/pull/47080
3286 [47084]: https://github.com/rust-lang/rust/pull/47084
3287 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3288 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3289 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3290 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3291 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3292 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3295 Version 1.23.0 (2018-01-04)
3296 ==========================
3300 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3301 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3302 Which should fix some confusing errors in some operations.
3306 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3307 undefined behavior.][45920]
3308 - [rustc now suggests renaming import if names clash.][45660]
3309 - [Display errors/warnings correctly when there are zero-width or
3310 wide characters.][45711]
3311 - [rustc now avoids unnecessary copies of arguments that are
3312 simple bindings][45380] This should improve memory usage on average by 5-10%.
3313 - [Updated musl used to build musl rustc to 1.1.17][45393]
3317 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3318 - [Implement Hash for raw pointers to unsized types][45483]
3319 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3320 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3321 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3322 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3323 and `<*mut T>::as_mut`][44932]
3324 - [Optimized `Thread::{park, unpark}` implementation][45524]
3325 - [Improved `SliceExt::binary_search` performance.][45333]
3326 - [impl `FromIterator<()>` for `()`][45379]
3327 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3335 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3336 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3337 - [Added unit test checking to `cargo check`][cargo/4592]
3338 - [Cargo now lets you install a specific version
3339 using `cargo install --version`][cargo/4637]
3343 - [Releases now ship with the Cargo book documentation.][45692]
3344 - [rustdoc now prints rendering warnings on every run.][45324]
3348 - [Changes have been made to type equality to make it more correct,
3349 in rare cases this could break some code.][45853] [Tracking issue for
3350 further information][45852]
3351 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3352 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3353 Android 9, the minimum supported version is Android 14.
3354 - [Bumped the minimum LLVM to 3.9][45326]
3356 [44042]: https://github.com/rust-lang/rust/pull/44042
3357 [44932]: https://github.com/rust-lang/rust/pull/44932
3358 [45267]: https://github.com/rust-lang/rust/pull/45267
3359 [45324]: https://github.com/rust-lang/rust/pull/45324
3360 [45326]: https://github.com/rust-lang/rust/pull/45326
3361 [45333]: https://github.com/rust-lang/rust/pull/45333
3362 [45379]: https://github.com/rust-lang/rust/pull/45379
3363 [45380]: https://github.com/rust-lang/rust/pull/45380
3364 [45393]: https://github.com/rust-lang/rust/pull/45393
3365 [45435]: https://github.com/rust-lang/rust/pull/45435
3366 [45483]: https://github.com/rust-lang/rust/pull/45483
3367 [45524]: https://github.com/rust-lang/rust/pull/45524
3368 [45571]: https://github.com/rust-lang/rust/pull/45571
3369 [45580]: https://github.com/rust-lang/rust/pull/45580
3370 [45610]: https://github.com/rust-lang/rust/pull/45610
3371 [45660]: https://github.com/rust-lang/rust/pull/45660
3372 [45692]: https://github.com/rust-lang/rust/pull/45692
3373 [45711]: https://github.com/rust-lang/rust/pull/45711
3374 [45772]: https://github.com/rust-lang/rust/pull/45772
3375 [45852]: https://github.com/rust-lang/rust/issues/45852
3376 [45853]: https://github.com/rust-lang/rust/pull/45853
3377 [45887]: https://github.com/rust-lang/rust/pull/45887
3378 [45920]: https://github.com/rust-lang/rust/pull/45920
3379 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3380 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3381 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3384 Version 1.22.1 (2017-11-22)
3385 ==========================
3387 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3389 [46183]: https://github.com/rust-lang/rust/pull/46183
3391 Version 1.22.0 (2017-11-22)
3392 ==========================
3396 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3397 - [Now accepts underscores in unicode escapes][43716]
3398 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3399 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3403 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3404 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3405 This should decrease compile times for debug builds.
3406 - [strict memory alignment now enabled on ARMv6][45094]
3407 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3411 - [Allow atomic operations up to 32 bits
3412 on `armv5te_unknown_linux_gnueabi`][44978]
3413 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3414 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3415 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3416 - [Properly detect overflow in `Instant += Duration`.][44220]
3417 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3418 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3419 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3426 - [Cargo will now build multi file examples in subdirectories of the `examples`
3427 folder that have a `main.rs` file.][cargo/4496]
3428 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3429 the old format will continue to work and can be updated with `cargo update`.
3430 - [Now supports vendoring git repositories][cargo/3992]
3434 - [`libbacktrace` is now available on Apple platforms.][44251]
3435 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3436 This now lets you specify that a given code example will fail to compile.
3440 - [The minimum Android version that rustc can build for has been bumped
3441 to `4.0` from `2.3`][45656]
3442 - [Allowing `T op= &T` for numeric types has broken some type
3443 inference cases][45480]
3446 [42526]: https://github.com/rust-lang/rust/pull/42526
3447 [43017]: https://github.com/rust-lang/rust/pull/43017
3448 [43716]: https://github.com/rust-lang/rust/pull/43716
3449 [43949]: https://github.com/rust-lang/rust/pull/43949
3450 [44015]: https://github.com/rust-lang/rust/pull/44015
3451 [44220]: https://github.com/rust-lang/rust/pull/44220
3452 [44251]: https://github.com/rust-lang/rust/pull/44251
3453 [44287]: https://github.com/rust-lang/rust/pull/44287
3454 [44303]: https://github.com/rust-lang/rust/pull/44303
3455 [44456]: https://github.com/rust-lang/rust/pull/44456
3456 [44466]: https://github.com/rust-lang/rust/pull/44466
3457 [44895]: https://github.com/rust-lang/rust/pull/44895
3458 [44966]: https://github.com/rust-lang/rust/pull/44966
3459 [44978]: https://github.com/rust-lang/rust/pull/44978
3460 [45041]: https://github.com/rust-lang/rust/pull/45041
3461 [45064]: https://github.com/rust-lang/rust/pull/45064
3462 [45075]: https://github.com/rust-lang/rust/pull/45075
3463 [45094]: https://github.com/rust-lang/rust/pull/45094
3464 [45095]: https://github.com/rust-lang/rust/pull/45095
3465 [45480]: https://github.com/rust-lang/rust/issues/45480
3466 [45656]: https://github.com/rust-lang/rust/pull/45656
3467 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3468 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3469 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3476 Version 1.21.0 (2017-10-12)
3477 ==========================
3481 - [You can now use static references for literals.][43838]
3485 let x: &'static u32 = &0;
3488 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3491 my_macro!(Vec<i32>::new); // Always worked
3492 my_macro!(Vec::<i32>::new); // Now works
3497 - [Upgraded jemalloc to 4.5.0][43911]
3498 - [Enabled unwinding panics on Redox][43917]
3499 - [Now runs LLVM in parallel during translation phase.][43506]
3500 This should reduce peak memory usage.
3504 - [Generate builtin impls for `Clone` for all arrays and tuples that
3505 are `T: Clone`][43690]
3506 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3507 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3508 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3513 [`std::mem::discriminant`]
3517 - [You can now call `cargo install` with multiple package names][cargo/4216]
3518 - [Cargo commands inside a virtual workspace will now implicitly
3519 pass `--all`][cargo/4335]
3520 - [Added a `[patch]` section to `Cargo.toml` to handle
3521 prepublication dependencies][cargo/4123] [RFC 1969]
3522 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3523 like patterns][cargo/4270]
3524 - [Added the `--all-targets` option][cargo/4400]
3525 - [Using required dependencies as a feature is now deprecated and emits
3526 a warning][cargo/4364]
3531 - [Cargo docs are moving][43916]
3532 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3533 - [The rustdoc book is now available][43863]
3534 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3535 - [Added a preview of RLS has been made available through rustup][44204]
3536 Install with `rustup component add rls-preview`
3537 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3538 Previously only showed `std::os::unix`.
3542 - [Changes in method matching against higher-ranked types][43880] This may cause
3543 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3544 - [rustc's JSON error output's byte position start at top of file.][42973]
3545 Was previously relative to the rustc's internal `CodeMap` struct which
3546 required the unstable library `libsyntax` to correctly use.
3547 - [`unused_results` lint no longer ignores booleans][43728]
3549 [42565]: https://github.com/rust-lang/rust/pull/42565
3550 [42973]: https://github.com/rust-lang/rust/pull/42973
3551 [43348]: https://github.com/rust-lang/rust/pull/43348
3552 [43459]: https://github.com/rust-lang/rust/pull/43459
3553 [43506]: https://github.com/rust-lang/rust/pull/43506
3554 [43540]: https://github.com/rust-lang/rust/pull/43540
3555 [43690]: https://github.com/rust-lang/rust/pull/43690
3556 [43728]: https://github.com/rust-lang/rust/pull/43728
3557 [43838]: https://github.com/rust-lang/rust/pull/43838
3558 [43863]: https://github.com/rust-lang/rust/pull/43863
3559 [43880]: https://github.com/rust-lang/rust/pull/43880
3560 [43911]: https://github.com/rust-lang/rust/pull/43911
3561 [43916]: https://github.com/rust-lang/rust/pull/43916
3562 [43917]: https://github.com/rust-lang/rust/pull/43917
3563 [44204]: https://github.com/rust-lang/rust/pull/44204
3564 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3565 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3566 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3567 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3568 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3569 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3570 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3571 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3572 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3574 Version 1.20.0 (2017-08-31)
3575 ===========================
3579 - [Associated constants are now stabilised.][42809]
3580 - [A lot of macro bugs are now fixed.][42913]
3585 - [Struct fields are now properly coerced to the expected field type.][42807]
3586 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3587 `wasm32-experimental-emscripten` target.
3588 - [Changed some of the error messages to be more helpful.][42033]
3589 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3591 - [rustc now reports the total number of errors on compilation failure][43015]
3592 previously this was only the number of errors in the pass that failed.
3593 - [Expansion in rustc has been sped up 29x.][42533]
3594 - [added `msp430-none-elf` target.][43099]
3595 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3597 - [Fixes backtraces on Redox][43228]
3598 - [rustc now identifies different versions of same crate when absolute paths of
3599 different types match in an error message.][42826]
3605 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3606 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3608 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3609 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3610 - [Impl `Clone` for `DefaultHasher`.][42799]
3611 - [Impl `Sync` for `SyncSender`.][42397]
3612 - [Impl `FromStr` for `char`][42271]
3613 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3615 - [allow messages in the `unimplemented!()` macro.][42155]
3616 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3617 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3618 - [Upgrade to Unicode 10.0.0][42999]
3619 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3620 - [Skip the main thread's manual stack guard on Linux][43072]
3621 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3622 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3624 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3629 - [`CStr::into_c_string`]
3630 - [`CString::as_c_str`]
3631 - [`CString::into_boxed_c_str`]
3632 - [`Chain::get_mut`]
3633 - [`Chain::get_ref`]
3634 - [`Chain::into_inner`]
3635 - [`Option::get_or_insert_with`]
3636 - [`Option::get_or_insert`]
3637 - [`OsStr::into_os_string`]
3638 - [`OsString::into_boxed_os_str`]
3641 - [`Utf8Error::error_len`]
3642 - [`char::EscapeDebug`]
3643 - [`char::escape_debug`]
3644 - [`compile_error!`]
3645 - [`f32::from_bits`]
3647 - [`f64::from_bits`]
3649 - [`mem::ManuallyDrop`]
3650 - [`slice::sort_unstable_by_key`]
3651 - [`slice::sort_unstable_by`]
3652 - [`slice::sort_unstable`]
3653 - [`str::from_boxed_utf8_unchecked`]
3654 - [`str::as_bytes_mut`]
3655 - [`str::as_bytes_mut`]
3656 - [`str::from_utf8_mut`]
3657 - [`str::from_utf8_unchecked_mut`]
3659 - [`str::get_unchecked_mut`]
3660 - [`str::get_unchecked`]
3662 - [`str::into_boxed_bytes`]
3667 - [Cargo API token location moved from `~/.cargo/config` to
3668 `~/.cargo/credentials`.][cargo/3978]
3669 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3670 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3671 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3672 - [You can now specify version of a binary when installed through
3673 `cargo install` using `--vers`.][cargo/4229]
3674 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3675 failure.][cargo/4248]
3676 - [Changed the convention around which file is the crate root.][cargo/4259]
3677 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3678 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3683 - [Functions with `'static` in their return types will now not be as usable as
3684 if they were using lifetime parameters instead.][42417]
3685 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3686 takes the sign of NaN into account where previously didn't.][42430]
3688 [42033]: https://github.com/rust-lang/rust/pull/42033
3689 [42155]: https://github.com/rust-lang/rust/pull/42155
3690 [42271]: https://github.com/rust-lang/rust/pull/42271
3691 [42397]: https://github.com/rust-lang/rust/pull/42397
3692 [42417]: https://github.com/rust-lang/rust/pull/42417
3693 [42430]: https://github.com/rust-lang/rust/pull/42430
3694 [42431]: https://github.com/rust-lang/rust/pull/42431
3695 [42533]: https://github.com/rust-lang/rust/pull/42533
3696 [42571]: https://github.com/rust-lang/rust/pull/42571
3697 [42613]: https://github.com/rust-lang/rust/pull/42613
3698 [42799]: https://github.com/rust-lang/rust/pull/42799
3699 [42807]: https://github.com/rust-lang/rust/pull/42807
3700 [42809]: https://github.com/rust-lang/rust/pull/42809
3701 [42822]: https://github.com/rust-lang/rust/pull/42822
3702 [42826]: https://github.com/rust-lang/rust/pull/42826
3703 [42854]: https://github.com/rust-lang/rust/pull/42854
3704 [42913]: https://github.com/rust-lang/rust/pull/42913
3705 [42999]: https://github.com/rust-lang/rust/pull/42999
3706 [43011]: https://github.com/rust-lang/rust/pull/43011
3707 [43015]: https://github.com/rust-lang/rust/pull/43015
3708 [43072]: https://github.com/rust-lang/rust/pull/43072
3709 [43077]: https://github.com/rust-lang/rust/pull/43077
3710 [43097]: https://github.com/rust-lang/rust/pull/43097
3711 [43099]: https://github.com/rust-lang/rust/pull/43099
3712 [43170]: https://github.com/rust-lang/rust/pull/43170
3713 [43178]: https://github.com/rust-lang/rust/pull/43178
3714 [43185]: https://github.com/rust-lang/rust/pull/43185
3715 [43228]: https://github.com/rust-lang/rust/pull/43228
3716 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3717 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3718 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3719 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3720 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3721 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3722 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3723 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3724 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3725 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3726 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3727 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3728 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3729 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3730 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3731 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3732 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3733 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3734 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3735 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3736 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3737 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3738 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3739 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3740 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3741 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3742 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3743 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3744 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3745 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3746 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3747 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3748 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3749 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3750 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3751 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3752 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3753 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3754 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3757 Version 1.19.0 (2017-07-20)
3758 ===========================
3763 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3764 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3765 - [Macro recursion limit increased to 1024 from 64.][41676]
3766 - [Added lint for detecting unused macros.][41907]
3767 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3768 For example: `let x = loop { break 7; };`
3769 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3770 contain `Copy` types and cannot have a `Drop` implementation.
3771 Example: `union Foo { bar: u8, baz: usize }`
3772 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3773 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3778 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3779 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3780 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3781 you should use `--target armv7-linux-androideabi`.
3782 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3783 - [Minor optimisation of string operations.][42037]
3784 - [Compiler error message is now `aborting due to previous error(s)` instead of
3785 `aborting due to N previous errors`][42150] This was previously inaccurate and
3786 would only count certain kinds of errors.
3787 - [The compiler now supports Visual Studio 2017][42225]
3788 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3789 - [Added a lot][42264] of [new error codes][42302]
3790 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3791 libraries with C Run-time Libraries(CRT) to be statically linked.
3792 - [Fixed various ARM codegen bugs][42740]
3797 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3798 `Extend<Cow<'a, str>>`][41449]
3799 - [`Vec` now implements `From<&mut [T]>`][41530]
3800 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3801 - [`SplitWhitespace` now implements `Clone`][41659]
3802 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3804 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3805 macros, but for printing to stderr.
3810 - [`OsString::shrink_to_fit`]
3813 - [`thread::ThreadId`]
3818 - [Build scripts can now add environment variables to the environment
3819 the crate is being compiled in.
3820 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3821 - [Subcommands now replace the current process rather than spawning a new
3822 child process][cargo/3970]
3823 - [Workspace members can now accept glob file patterns][cargo/3979]
3824 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3825 the members in a given workspace.][cargo/3988]
3826 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3827 - [Target directory path is now in the cargo metadata][cargo/4022]
3828 - [Cargo no longer checks out a local working directory for the
3829 crates.io index][cargo/4026] This should provide smaller file size for the
3830 registry, and improve cloning times, especially on Windows machines.
3831 - [Added an `--exclude` option for excluding certain packages when using the
3832 `--all` option][cargo/4031]
3833 - [Cargo will now automatically retry when receiving a 5xx error
3834 from crates.io][cargo/4032]
3835 - [The `--features` option now accepts multiple comma or space
3836 delimited values.][cargo/4084]
3837 - [Added support for custom target specific runners][cargo/3954]
3842 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3844 - [Rust will now release XZ compressed packages][rust-installer/57]
3845 - [rustup will now prefer to download rust packages with
3846 XZ compression][rustup/1100] over GZip packages.
3847 - [Added the ability to escape `#` in rust documentation][41785] By adding
3848 additional `#`'s ie. `##` is now `#`
3853 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3854 - [`-Z` flags are now no longer allowed to be used on the stable
3855 compiler.][41751] This has been a warning for a year previous to this.
3856 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3857 longer works][42844]. Users should migrate to the built-in `check`
3858 command, which has been available since 1.16.
3859 - [Ending a float literal with `._` is now a hard error.
3860 Example: `42._` .][41946]
3861 - [Any use of a private `extern crate` outside of its module is now a
3862 hard error.][36886] This was previously a warning.
3863 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3864 relative while the `::` prefix makes a path absolute, but was ignored and the
3865 path was relative regardless.
3866 - [Floating point constants in match patterns is now a hard error][36890]
3867 This was previously a warning.
3868 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3869 match patterns is now a hard error][36891] This was previously a warning.
3870 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3872 - [From the pound escape, lines consisting of multiple `#`s are
3874 - [It is an error to re-export private enum variants][42460]. This is
3875 known to break a number of crates that depend on an older version of
3877 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3878 to use it to find the linker, and the build will fail where it did
3879 not previously][42607]
3881 [36886]: https://github.com/rust-lang/rust/issues/36886
3882 [36888]: https://github.com/rust-lang/rust/issues/36888
3883 [36890]: https://github.com/rust-lang/rust/issues/36890
3884 [36891]: https://github.com/rust-lang/rust/issues/36891
3885 [36892]: https://github.com/rust-lang/rust/issues/36892
3886 [37406]: https://github.com/rust-lang/rust/issues/37406
3887 [39983]: https://github.com/rust-lang/rust/pull/39983
3888 [41145]: https://github.com/rust-lang/rust/pull/41145
3889 [41192]: https://github.com/rust-lang/rust/pull/41192
3890 [41258]: https://github.com/rust-lang/rust/pull/41258
3891 [41370]: https://github.com/rust-lang/rust/pull/41370
3892 [41449]: https://github.com/rust-lang/rust/pull/41449
3893 [41530]: https://github.com/rust-lang/rust/pull/41530
3894 [41624]: https://github.com/rust-lang/rust/pull/41624
3895 [41656]: https://github.com/rust-lang/rust/pull/41656
3896 [41659]: https://github.com/rust-lang/rust/pull/41659
3897 [41676]: https://github.com/rust-lang/rust/pull/41676
3898 [41751]: https://github.com/rust-lang/rust/pull/41751
3899 [41764]: https://github.com/rust-lang/rust/pull/41764
3900 [41785]: https://github.com/rust-lang/rust/pull/41785
3901 [41873]: https://github.com/rust-lang/rust/pull/41873
3902 [41907]: https://github.com/rust-lang/rust/pull/41907
3903 [41946]: https://github.com/rust-lang/rust/pull/41946
3904 [42016]: https://github.com/rust-lang/rust/pull/42016
3905 [42037]: https://github.com/rust-lang/rust/pull/42037
3906 [42068]: https://github.com/rust-lang/rust/pull/42068
3907 [42150]: https://github.com/rust-lang/rust/pull/42150
3908 [42162]: https://github.com/rust-lang/rust/pull/42162
3909 [42225]: https://github.com/rust-lang/rust/pull/42225
3910 [42264]: https://github.com/rust-lang/rust/pull/42264
3911 [42302]: https://github.com/rust-lang/rust/pull/42302
3912 [42460]: https://github.com/rust-lang/rust/issues/42460
3913 [42607]: https://github.com/rust-lang/rust/issues/42607
3914 [42740]: https://github.com/rust-lang/rust/pull/42740
3915 [42844]: https://github.com/rust-lang/rust/issues/42844
3916 [42948]: https://github.com/rust-lang/rust/pull/42948
3917 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3918 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3919 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3920 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3921 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3922 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3923 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3924 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3925 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3926 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3927 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3928 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3929 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3930 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3931 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3932 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3933 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3934 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3935 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3936 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3937 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3938 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3941 Version 1.18.0 (2017-06-08)
3942 ===========================
3947 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3948 make the item visible to just that module tree. Also accepts the keyword
3949 `crate` to make something public to the whole crate but not users of the
3950 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3951 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3952 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3953 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3954 types like `Write + Send`, trailing `+` are now supported in trait objects,
3955 and better error reporting for trait objects starting with `?Sized`.
3956 - [0e+10 is now a valid floating point literal][40589]
3957 - [Now warns if you bind a lifetime parameter to 'static][40734]
3958 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3959 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3960 representation in some cases.][40377]
3965 - [rustc can now emit mir with `--emit mir`][39891]
3966 - [Improved LLVM IR for trivial functions][40367]
3967 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3968 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3969 opportunities found through profiling
3970 - [Improved backtrace formatting when panicking][38165]
3975 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3976 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3977 iteration or reallocation.
3978 - [Simplified HashMap Bucket interface][40561] provides performance
3979 improvements for iterating and cloning.
3980 - [Specialize Vec::from_elem to use calloc][40409]
3981 - [Fixed Race condition in fs::create_dir_all][39799]
3982 - [No longer caching stdio on Windows][40516]
3983 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3984 2.50%~ faster and in one case now 12.50% faster.
3985 - [Optimized `AtomicBool::fetch_nand`][41143]
3990 - [`Child::try_wait`]
3991 - [`HashMap::retain`]
3992 - [`HashSet::retain`]
3994 - [`TcpStream::peek`]
3995 - [`UdpSocket::peek`]
3996 - [`UdpSocket::peek_from`]
4001 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4002 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4003 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4004 - [Added Android build support][cargo/3885]
4005 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4006 of a certain type, for example `cargo build --bins` will build all
4008 - [Added support for haiku][cargo/3952]
4013 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4014 - [Added rust-windbg script for better debugging on Windows][39983]
4015 - [Rust now uses the official cross compiler for NetBSD][40612]
4016 - [rustdoc now accepts `#` at the start of files][40828]
4017 - [Fixed jemalloc support for musl][41168]
4022 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4023 always placed after the sign if it exists and before the digits. With the `#`
4024 flag the zeroes are placed after the prefix and before the digits.
4025 - [Due to the struct field optimisation][40377], using `transmute` on structs
4026 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4027 always been undefined behavior, but is now more likely to break in practice.
4028 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4029 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4030 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4031 - [Overlapping inherent `impl`s are now a hard error][40728]
4032 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4033 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4034 `out.asm` and `out.ll` instead of only one of the filetypes.
4035 - [ calling a function that returns `Self` will no longer work][41805] when
4036 the size of `Self` cannot be statically determined.
4037 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4038 this has caused a few regressions namely:
4040 - Changed the link order of local static/dynamic libraries (respecting the
4041 order on given rather than having the compiler reorder).
4042 - Changed how MinGW is linked, native code linked to dynamic libraries
4043 may require manually linking to the gcc support library (for the native
4046 [38165]: https://github.com/rust-lang/rust/pull/38165
4047 [39799]: https://github.com/rust-lang/rust/pull/39799
4048 [39891]: https://github.com/rust-lang/rust/pull/39891
4049 [39983]: https://github.com/rust-lang/rust/pull/39983
4050 [40043]: https://github.com/rust-lang/rust/pull/40043
4051 [40241]: https://github.com/rust-lang/rust/pull/40241
4052 [40338]: https://github.com/rust-lang/rust/pull/40338
4053 [40367]: https://github.com/rust-lang/rust/pull/40367
4054 [40377]: https://github.com/rust-lang/rust/pull/40377
4055 [40409]: https://github.com/rust-lang/rust/pull/40409
4056 [40516]: https://github.com/rust-lang/rust/pull/40516
4057 [40556]: https://github.com/rust-lang/rust/pull/40556
4058 [40561]: https://github.com/rust-lang/rust/pull/40561
4059 [40589]: https://github.com/rust-lang/rust/pull/40589
4060 [40612]: https://github.com/rust-lang/rust/pull/40612
4061 [40723]: https://github.com/rust-lang/rust/pull/40723
4062 [40728]: https://github.com/rust-lang/rust/pull/40728
4063 [40731]: https://github.com/rust-lang/rust/pull/40731
4064 [40734]: https://github.com/rust-lang/rust/pull/40734
4065 [40805]: https://github.com/rust-lang/rust/pull/40805
4066 [40807]: https://github.com/rust-lang/rust/pull/40807
4067 [40828]: https://github.com/rust-lang/rust/pull/40828
4068 [40870]: https://github.com/rust-lang/rust/pull/40870
4069 [41085]: https://github.com/rust-lang/rust/pull/41085
4070 [41143]: https://github.com/rust-lang/rust/pull/41143
4071 [41168]: https://github.com/rust-lang/rust/pull/41168
4072 [41270]: https://github.com/rust-lang/rust/issues/41270
4073 [41469]: https://github.com/rust-lang/rust/pull/41469
4074 [41805]: https://github.com/rust-lang/rust/issues/41805
4075 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4076 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4077 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4078 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4079 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4080 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4081 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4082 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4083 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4084 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4085 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4086 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4087 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4088 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4091 Version 1.17.0 (2017-04-27)
4092 ===========================
4097 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4098 * [Fields of structs may be initialized without duplicating the field/variable
4099 names][39761]. [RFC 1682]
4100 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4101 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4102 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4103 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4104 `'b`. Soundness fix.
4105 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4106 * [Static variables may contain references to other statics][40027]
4111 * [Exit quickly on only `--emit dep-info`][40336]
4112 * [Make `-C relocation-model` more correctly determine whether the linker
4113 creates a position-independent executable][40245]
4114 * [Add `-C overflow-checks` to directly control whether integer overflow
4116 * [The rustc type checker now checks items on demand instead of in a single
4117 in-order pass][40008]. This is mostly an internal refactoring in support of
4118 future work, including incremental type checking, but also resolves [RFC
4119 1647], allowing `Self` to appear in `impl` `where` clauses.
4120 * [Optimize vtable loads][39995]
4121 * [Turn off vectorization for Emscripten targets][39990]
4122 * [Provide suggestions for unknown macros imported with `use`][39953]
4123 * [Fix ICEs in path resolution][39939]
4124 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4125 * [Add clearer error message using `&str + &str`][39116]
4136 * [`Ordering::then`]
4137 * [`Ordering::then_with`]
4138 * [`BTreeMap::range`]
4139 * [`BTreeMap::range_mut`]
4140 * [`collections::Bound`]
4141 * [`process::abort`]
4142 * [`ptr::read_unaligned`]
4143 * [`ptr::write_unaligned`]
4144 * [`Result::expect_err`]
4147 * [`Cell::into_inner`]
4153 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4154 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4155 * [`String` implements `FromIterator<&char>`][40028]
4156 * `Box` [implements][40009] a number of new conversions:
4157 `From<Box<str>> for String`,
4158 `From<Box<[T]>> for Vec<T>`,
4159 `From<Box<CStr>> for CString`,
4160 `From<Box<OsStr>> for OsString`,
4161 `From<Box<Path>> for PathBuf`,
4162 `Into<Box<str>> for String`,
4163 `Into<Box<[T]>> for Vec<T>`,
4164 `Into<Box<CStr>> for CString`,
4165 `Into<Box<OsStr>> for OsString`,
4166 `Into<Box<Path>> for PathBuf`,
4167 `Default for Box<str>`,
4168 `Default for Box<CStr>`,
4169 `Default for Box<OsStr>`,
4170 `From<&CStr> for Box<CStr>`,
4171 `From<&OsStr> for Box<OsStr>`,
4172 `From<&Path> for Box<Path>`
4173 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4174 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4175 * [Slightly optimize `slice::sort`][39538]
4176 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4177 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4178 `Box<str>` implements `From<&str>`][39438]
4179 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4180 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4181 * [`format!` estimates the needed capacity before writing a string][39356]
4182 * [Support unprivileged symlink creation in Windows][38921]
4183 * [`PathBuf` implements `Default`][38764]
4184 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4185 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4186 and poor hash functions.
4191 * [Add `cargo check --all`][cargo/3731]
4192 * [Add an option to ignore SSL revocation checking][cargo/3699]
4193 * [Add `cargo run --package`][cargo/3691]
4194 * [Add `required_features`][cargo/3667]
4195 * [Assume `build.rs` is a build script][cargo/3664]
4196 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4201 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4203 * [The "Unstable Book" documents nightly-only features][ubook]
4204 * [Improve the style of the sidebar in rustdoc output][40265]
4205 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4206 * [Fix MSP430 breakage due to `i128`][40257]
4207 * [Preliminary Solaris/SPARCv9 support][39903]
4208 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4209 run without installing the MSVC runtime.
4210 * [`rustdoc --test` includes file names in test names][39788]
4211 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4212 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4213 * [Initial support for `aarch64-unknown-freebsd`][39491]
4214 * [Initial support for `i686-unknown-netbsd`][39426]
4215 * [This release no longer includes the old makefile build system][39431]. Rust
4216 is built with a custom build system, written in Rust, and with Cargo.
4217 * [Add Debug implementations for libcollection structs][39002]
4218 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4219 * [`--test-threads=0` produces an error][38945]
4220 * [`rustup` installs documentation by default][40526]
4221 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4222 WinDbg and Visual Studio to improve the debugging experience.
4227 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4228 workaround, either use MSVC 2015 or run vcvars.bat.
4229 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4230 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4231 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4233 * [`format!` and `Display::to_string` panic if an underlying formatting
4234 implementation returns an error][40117]. Previously the error was silently
4235 ignored. It is incorrect for `write_fmt` to return an error when writing
4237 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4238 crates were marked stable and could be accessed from the stable toolchain.
4239 * [Rust git source no longer includes vendored crates][39728]. Those that need
4240 to build with vendored crates should build from release tarballs.
4241 * [Fix inert attributes from `proc_macro_derives`][39572]
4242 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4243 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4245 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4246 existing code generally ignores the type of dead-code unless a type-hint is
4247 provided; this can cause surprising inference interactions particularly around
4248 defaulting. The new code uniformly ignores the result type of dead-code.
4249 * [Tuple-struct constructors with private fields are no longer visible][38932]
4250 * [Lifetime parameters that do not appear in the arguments are now considered
4251 early-bound][38897], resolving a soundness bug (#[32330]). The
4252 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4254 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4255 * [Make transmuting from fn item types to pointer-sized types a hard
4258 [27787]: https://github.com/rust-lang/rust/issues/27787
4259 [32330]: https://github.com/rust-lang/rust/issues/32330
4260 [34198]: https://github.com/rust-lang/rust/pull/34198
4261 [38161]: https://github.com/rust-lang/rust/pull/38161
4262 [38368]: https://github.com/rust-lang/rust/pull/38368
4263 [38584]: https://github.com/rust-lang/rust/issues/38584
4264 [38661]: https://github.com/rust-lang/rust/pull/38661
4265 [38764]: https://github.com/rust-lang/rust/pull/38764
4266 [38864]: https://github.com/rust-lang/rust/issues/38864
4267 [38897]: https://github.com/rust-lang/rust/pull/38897
4268 [38921]: https://github.com/rust-lang/rust/pull/38921
4269 [38932]: https://github.com/rust-lang/rust/pull/38932
4270 [38945]: https://github.com/rust-lang/rust/pull/38945
4271 [38981]: https://github.com/rust-lang/rust/pull/38981
4272 [39002]: https://github.com/rust-lang/rust/pull/39002
4273 [39116]: https://github.com/rust-lang/rust/pull/39116
4274 [39193]: https://github.com/rust-lang/rust/pull/39193
4275 [39265]: https://github.com/rust-lang/rust/pull/39265
4276 [39356]: https://github.com/rust-lang/rust/pull/39356
4277 [39372]: https://github.com/rust-lang/rust/pull/39372
4278 [39426]: https://github.com/rust-lang/rust/pull/39426
4279 [39431]: https://github.com/rust-lang/rust/pull/39431
4280 [39438]: https://github.com/rust-lang/rust/pull/39438
4281 [39440]: https://github.com/rust-lang/rust/pull/39440
4282 [39485]: https://github.com/rust-lang/rust/pull/39485
4283 [39491]: https://github.com/rust-lang/rust/pull/39491
4284 [39518]: https://github.com/rust-lang/rust/pull/39518
4285 [39538]: https://github.com/rust-lang/rust/pull/39538
4286 [39572]: https://github.com/rust-lang/rust/pull/39572
4287 [39633]: https://github.com/rust-lang/rust/pull/39633
4288 [39642]: https://github.com/rust-lang/rust/pull/39642
4289 [39728]: https://github.com/rust-lang/rust/pull/39728
4290 [39761]: https://github.com/rust-lang/rust/pull/39761
4291 [39788]: https://github.com/rust-lang/rust/pull/39788
4292 [39793]: https://github.com/rust-lang/rust/pull/39793
4293 [39837]: https://github.com/rust-lang/rust/pull/39837
4294 [39843]: https://github.com/rust-lang/rust/pull/39843
4295 [39851]: https://github.com/rust-lang/rust/pull/39851
4296 [39903]: https://github.com/rust-lang/rust/pull/39903
4297 [39939]: https://github.com/rust-lang/rust/pull/39939
4298 [39953]: https://github.com/rust-lang/rust/pull/39953
4299 [39960]: https://github.com/rust-lang/rust/pull/39960
4300 [39990]: https://github.com/rust-lang/rust/pull/39990
4301 [39995]: https://github.com/rust-lang/rust/pull/39995
4302 [40008]: https://github.com/rust-lang/rust/pull/40008
4303 [40009]: https://github.com/rust-lang/rust/pull/40009
4304 [40027]: https://github.com/rust-lang/rust/pull/40027
4305 [40028]: https://github.com/rust-lang/rust/pull/40028
4306 [40037]: https://github.com/rust-lang/rust/pull/40037
4307 [40117]: https://github.com/rust-lang/rust/pull/40117
4308 [40166]: https://github.com/rust-lang/rust/pull/40166
4309 [40245]: https://github.com/rust-lang/rust/pull/40245
4310 [40257]: https://github.com/rust-lang/rust/pull/40257
4311 [40261]: https://github.com/rust-lang/rust/pull/40261
4312 [40265]: https://github.com/rust-lang/rust/pull/40265
4313 [40319]: https://github.com/rust-lang/rust/pull/40319
4314 [40336]: https://github.com/rust-lang/rust/pull/40336
4315 [40526]: https://github.com/rust-lang/rust/pull/40526
4316 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4317 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4318 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4319 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4320 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4321 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4322 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4323 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4324 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4325 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4326 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4327 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4328 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4329 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4330 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4331 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4332 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4333 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4334 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4335 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4336 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4337 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4338 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4339 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4340 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4341 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4342 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4343 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4344 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4345 [mdbook]: https://crates.io/crates/mdbook
4346 [ubook]: https://doc.rust-lang.org/unstable-book/
4349 Version 1.16.0 (2017-03-16)
4350 ===========================
4355 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4356 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4357 match patterns][38069]
4358 * [Clean up semantics of `self` in an import list][38313]
4359 * [`Self` may appear in `impl` headers][38920]
4360 * [`Self` may appear in struct expressions][39282]
4365 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4366 a `.rmeta` file containing only crate metadata][38571]. This can be
4367 used by tools like the Rust Language Service to perform
4368 metadata-only builds.
4369 * [Levenshtein based typo suggestions now work in most places, while
4370 previously they worked only for fields and sometimes for local
4371 variables][38927]. Together with the overhaul of "no
4372 resolution"/"unexpected resolution" errors (#[38154]) they result in
4373 large and systematic improvement in resolution diagnostics.
4374 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4376 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4377 * [`rustc` no longer attempts to provide "consider using an explicit
4378 lifetime" suggestions][37057]. They were inaccurate.
4383 * [`VecDeque::truncate`]
4384 * [`VecDeque::resize`]
4385 * [`String::insert_str`]
4386 * [`Duration::checked_add`]
4387 * [`Duration::checked_sub`]
4388 * [`Duration::checked_div`]
4389 * [`Duration::checked_mul`]
4392 * [`SocketAddr::is_ipv4`]
4393 * [`SocketAddr::is_ipv6`]
4394 * [`IpAddr::is_ipv4`]
4395 * [`IpAddr::is_ipv6`]
4397 * [`Vec::dedup_by_key`]
4398 * [`Result::unwrap_or_default`]
4399 * [`<*const T>::wrapping_offset`]
4400 * [`<*mut T>::wrapping_offset`]
4401 * `CommandExt::creation_flags`
4402 * [`File::set_permissions`]
4403 * [`String::split_off`]
4408 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4409 their argument by `Borrow` parameter][37761]
4410 * [All public types in std implement `Debug`][38006]
4411 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4412 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4413 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4415 * [std: Fix partial writes in `LineWriter`][38062]
4416 * [std: Clamp max read/write sizes on Unix][38062]
4417 * [Use more specific panic message for `&str` slicing errors][38066]
4418 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4419 functionality cannot be achieved in std currently.
4420 * [`writeln!`, like `println!`, now accepts a form with no string
4421 or formatting arguments, to just print a newline][38469]
4422 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4423 * [Reduce the size of static data in `std_unicode::tables`][38781]
4424 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4425 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4427 * [`Duration` implements `Sum`][38712]
4428 * [`String` implements `ToSocketAddrs`][39048]
4433 * [The `cargo check` command does a type check of a project without
4434 building it][cargo/3296]
4435 * [crates.io will display CI badges from Travis and AppVeyor, if
4436 specified in Cargo.toml][cargo/3546]
4437 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4438 * [Compilation profiles accept integer values for `debug`, in addition
4439 to `true` and `false`. These are passed to `rustc` as the value to
4440 `-C debuginfo`][cargo/3534]
4441 * [Implement `cargo --version --verbose`][cargo/3604]
4442 * [All builds now output 'dep-info' build dependencies compatible with
4443 make and ninja][cargo/3557]
4444 * [Build all workspace members with `build --all`][cargo/3511]
4445 * [Document all workspace members with `doc --all`][cargo/3515]
4446 * [Path deps outside workspace are not members][cargo/3443]
4451 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4452 the path to the Rust implementation][38589]
4453 * [The `armv7-linux-androideabi` target no longer enables NEON
4454 extensions, per Google's ABI guide][38413]
4455 * [The stock standard library can be compiled for Redox OS][38401]
4456 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4458 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4460 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4465 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4466 match patterns][38069]
4467 * In this release, references to uninhabited types can not be
4468 pattern-matched. This was accidentally allowed in 1.15.
4469 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4470 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4472 * [Clean up semantics of `self` in an import list][38313]
4473 * Reimplemented lifetime elision. This change was almost entirely compatible
4474 with existing code, but it did close a number of small bugs and loopholes,
4475 as well as being more accepting in some other [cases][41105].
4477 [37057]: https://github.com/rust-lang/rust/pull/37057
4478 [37761]: https://github.com/rust-lang/rust/pull/37761
4479 [38006]: https://github.com/rust-lang/rust/pull/38006
4480 [38051]: https://github.com/rust-lang/rust/pull/38051
4481 [38062]: https://github.com/rust-lang/rust/pull/38062
4482 [38062]: https://github.com/rust-lang/rust/pull/38622
4483 [38066]: https://github.com/rust-lang/rust/pull/38066
4484 [38069]: https://github.com/rust-lang/rust/pull/38069
4485 [38131]: https://github.com/rust-lang/rust/pull/38131
4486 [38154]: https://github.com/rust-lang/rust/pull/38154
4487 [38274]: https://github.com/rust-lang/rust/pull/38274
4488 [38304]: https://github.com/rust-lang/rust/pull/38304
4489 [38313]: https://github.com/rust-lang/rust/pull/38313
4490 [38314]: https://github.com/rust-lang/rust/pull/38314
4491 [38327]: https://github.com/rust-lang/rust/pull/38327
4492 [38401]: https://github.com/rust-lang/rust/pull/38401
4493 [38413]: https://github.com/rust-lang/rust/pull/38413
4494 [38469]: https://github.com/rust-lang/rust/pull/38469
4495 [38559]: https://github.com/rust-lang/rust/pull/38559
4496 [38571]: https://github.com/rust-lang/rust/pull/38571
4497 [38580]: https://github.com/rust-lang/rust/pull/38580
4498 [38589]: https://github.com/rust-lang/rust/pull/38589
4499 [38670]: https://github.com/rust-lang/rust/pull/38670
4500 [38712]: https://github.com/rust-lang/rust/pull/38712
4501 [38726]: https://github.com/rust-lang/rust/pull/38726
4502 [38781]: https://github.com/rust-lang/rust/pull/38781
4503 [38798]: https://github.com/rust-lang/rust/pull/38798
4504 [38909]: https://github.com/rust-lang/rust/pull/38909
4505 [38920]: https://github.com/rust-lang/rust/pull/38920
4506 [38927]: https://github.com/rust-lang/rust/pull/38927
4507 [39048]: https://github.com/rust-lang/rust/pull/39048
4508 [39282]: https://github.com/rust-lang/rust/pull/39282
4509 [39379]: https://github.com/rust-lang/rust/pull/39379
4510 [41105]: https://github.com/rust-lang/rust/issues/41105
4511 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4512 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4513 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4514 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4515 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4516 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4517 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4518 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4519 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4520 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4521 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4522 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4523 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4524 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4525 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4526 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4527 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4528 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4529 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4530 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4531 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4532 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4533 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4534 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4535 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4536 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4537 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4538 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4539 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4540 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4543 Version 1.15.1 (2017-02-09)
4544 ===========================
4546 * [Fix IntoIter::as_mut_slice's signature][39466]
4547 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4549 [39466]: https://github.com/rust-lang/rust/pull/39466
4550 [39523]: https://github.com/rust-lang/rust/pull/39523
4553 Version 1.15.0 (2017-02-02)
4554 ===========================
4559 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4560 stable. This allows popular code-generating crates like Serde and Diesel to
4561 work ergonomically. [RFC 1681].
4562 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4563 with curly braces][36868]. Part of [RFC 1506].
4564 * [A number of minor changes to name resolution have been activated][37127].
4565 They add up to more consistent semantics, allowing for future evolution of
4566 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4567 details of what is different. The breaking changes here have been transitioned
4568 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4569 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4571 * [`?Sized` can be used in `where` clauses][37791]
4572 * [There is now a limit on the size of monomorphized types and it can be
4573 modified with the `#![type_size_limit]` crate attribute, similarly to
4574 the `#![recursion_limit]` attribute][37789]
4579 * [On Windows, the compiler will apply dllimport attributes when linking to
4580 extern functions][37973]. Additional attributes and flags can control which
4581 library kind is linked and its name. [RFC 1717].
4582 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4583 * [The `--test` flag works with procedural macro crates][38107]
4584 * [Fix `extern "aapcs" fn` ABI][37814]
4585 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4586 * [The `format!` expander recognizes incorrect `printf` and shell-style
4587 formatting directives and suggests the correct format][37613].
4588 * [Only report one error for all unused imports in an import list][37456]
4590 Compiler Performance
4591 --------------------
4593 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4594 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4595 * [Don't clone in `UnificationTable::probe`][37848]
4596 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4597 * [Use small vectors in type walker][37760]
4598 * [Macro expansion performance was improved][37701]
4599 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4600 * [Replace FNV with a faster hash function][37229]
4605 * [`std::iter::Iterator::min_by`]
4606 * [`std::iter::Iterator::max_by`]
4607 * [`std::os::*::fs::FileExt`]
4608 * [`std::sync::atomic::Atomic*::get_mut`]
4609 * [`std::sync::atomic::Atomic*::into_inner`]
4610 * [`std::vec::IntoIter::as_slice`]
4611 * [`std::vec::IntoIter::as_mut_slice`]
4612 * [`std::sync::mpsc::Receiver::try_iter`]
4613 * [`std::os::unix::process::CommandExt::before_exec`]
4614 * [`std::rc::Rc::strong_count`]
4615 * [`std::rc::Rc::weak_count`]
4616 * [`std::sync::Arc::strong_count`]
4617 * [`std::sync::Arc::weak_count`]
4618 * [`std::char::encode_utf8`]
4619 * [`std::char::encode_utf16`]
4620 * [`std::cell::Ref::clone`]
4621 * [`std::io::Take::into_inner`]
4626 * [The standard sorting algorithm has been rewritten for dramatic performance
4627 improvements][38192]. It is a hybrid merge sort, drawing influences from
4628 Timsort. Previously it was a naive merge sort.
4629 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4630 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4632 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4633 and `char_indices().last()`][37882]
4634 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4635 * [Chinese characters display correctly in `fmt::Debug`][37855]
4636 * [Derive `Default` for `Duration`][37699]
4637 * [Support creation of anonymous pipes on WinXP/2k][37677]
4638 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4639 * [Don't pass overlapped handles to processes][38835]
4644 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4645 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4646 should instead check the variable at runtime with `std::env`. That the value
4647 was set at build time was a bug, and incorrect when cross-compiling. This
4648 change is known to cause breakage.
4649 * [Add `--all` flag to `cargo test`][cargo/3221]
4650 * [Compile statically against the MSVC CRT][cargo/3363]
4651 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4652 * [Link OpenSSL statically on OSX][cargo/3311]
4653 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4654 * [Test for bad path overrides with summaries][cargo/3336]
4655 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4656 * [Fix retrying crate downloads for network errors][cargo/3348]
4657 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4658 * [Emit more info on --message-format=json][cargo/3319]
4659 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4660 * [Don't ignore errors in workspace manifest][cargo/3409]
4661 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4666 * [Test runners (binaries built with `--test`) now support a `--list` argument
4667 that lists the tests it contains][38185]
4668 * [Test runners now support a `--exact` argument that makes the test filter
4669 match exactly, instead of matching only a substring of the test name][38181]
4670 * [rustdoc supports a `--playground-url` flag][37763]
4671 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4676 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4677 continue to be used in this release by passing `--disable-rustbuild` to the
4678 configure script, but they will be deleted soon. Note that the new build
4679 system uses a different on-disk layout that will likely affect any scripts
4681 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4683 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4684 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4690 * [A number of minor changes to name resolution have been activated][37127].
4691 They add up to more consistent semantics, allowing for future evolution of
4692 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4693 details of what is different. The breaking changes here have been transitioned
4694 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4695 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4696 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4697 should instead check the variable at runtime with `std::env`. That the value
4698 was set at build time was a bug, and incorrect when cross-compiling. This
4699 change is known to cause breakage.
4700 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4701 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4702 1.10 and is now an error by default. It will become a hard error in the near
4704 * [The semantics relating modules to file system directories are changing in
4705 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4706 lint, which is a warning in this release, and will become a hard error in the
4708 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4709 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4710 the underlying iterator][37834]
4712 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4713 [33685]: https://github.com/rust-lang/rust/issues/33685
4714 [36868]: https://github.com/rust-lang/rust/pull/36868
4715 [37127]: https://github.com/rust-lang/rust/pull/37127
4716 [37229]: https://github.com/rust-lang/rust/pull/37229
4717 [37456]: https://github.com/rust-lang/rust/pull/37456
4718 [37527]: https://github.com/rust-lang/rust/pull/37527
4719 [37602]: https://github.com/rust-lang/rust/pull/37602
4720 [37613]: https://github.com/rust-lang/rust/pull/37613
4721 [37615]: https://github.com/rust-lang/rust/pull/37615
4722 [37636]: https://github.com/rust-lang/rust/pull/37636
4723 [37627]: https://github.com/rust-lang/rust/pull/37627
4724 [37642]: https://github.com/rust-lang/rust/pull/37642
4725 [37677]: https://github.com/rust-lang/rust/pull/37677
4726 [37699]: https://github.com/rust-lang/rust/pull/37699
4727 [37701]: https://github.com/rust-lang/rust/pull/37701
4728 [37705]: https://github.com/rust-lang/rust/pull/37705
4729 [37749]: https://github.com/rust-lang/rust/pull/37749
4730 [37760]: https://github.com/rust-lang/rust/pull/37760
4731 [37763]: https://github.com/rust-lang/rust/pull/37763
4732 [37764]: https://github.com/rust-lang/rust/pull/37764
4733 [37789]: https://github.com/rust-lang/rust/pull/37789
4734 [37791]: https://github.com/rust-lang/rust/pull/37791
4735 [37814]: https://github.com/rust-lang/rust/pull/37814
4736 [37817]: https://github.com/rust-lang/rust/pull/37817
4737 [37834]: https://github.com/rust-lang/rust/pull/37834
4738 [37848]: https://github.com/rust-lang/rust/pull/37848
4739 [37855]: https://github.com/rust-lang/rust/pull/37855
4740 [37882]: https://github.com/rust-lang/rust/pull/37882
4741 [37888]: https://github.com/rust-lang/rust/pull/37888
4742 [37973]: https://github.com/rust-lang/rust/pull/37973
4743 [37979]: https://github.com/rust-lang/rust/pull/37979
4744 [38086]: https://github.com/rust-lang/rust/pull/38086
4745 [38107]: https://github.com/rust-lang/rust/pull/38107
4746 [38117]: https://github.com/rust-lang/rust/pull/38117
4747 [38134]: https://github.com/rust-lang/rust/pull/38134
4748 [38146]: https://github.com/rust-lang/rust/pull/38146
4749 [38181]: https://github.com/rust-lang/rust/pull/38181
4750 [38182]: https://github.com/rust-lang/rust/pull/38182
4751 [38185]: https://github.com/rust-lang/rust/pull/38185
4752 [38192]: https://github.com/rust-lang/rust/pull/38192
4753 [38279]: https://github.com/rust-lang/rust/pull/38279
4754 [38835]: https://github.com/rust-lang/rust/pull/38835
4755 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4756 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4757 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4758 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4759 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4760 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4761 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4762 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4763 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4764 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4765 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4766 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4767 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4768 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4769 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4770 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4771 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4772 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4773 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4774 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4775 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4776 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4777 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4778 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4779 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4780 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4781 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4782 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4783 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4784 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4785 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4786 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4787 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4788 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4789 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4790 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4791 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4792 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4795 Version 1.14.0 (2016-12-22)
4796 ===========================
4801 * [`..` matches multiple tuple fields in enum variants, structs
4802 and tuples][36843]. [RFC 1492].
4803 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4804 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4805 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4806 dereferencing][36822]
4811 * [Mark enums with non-zero discriminant as non-zero][37224]
4812 * [Lower-case `static mut` names are linted like other
4813 statics and consts][37162]
4814 * [Fix ICE on some macros in const integer positions
4815 (e.g. `[u8; m!()]`)][36819]
4816 * [Improve error message and snippet for "did you mean `x`"][36798]
4817 * [Add a panic-strategy field to the target specification][36794]
4818 * [Include LLVM version in `--version --verbose`][37200]
4820 Compile-time Optimizations
4821 --------------------------
4823 * [Improve macro expansion performance][37569]
4824 * [Shrink `Expr_::ExprInlineAsm`][37445]
4825 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4826 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4827 * [Avoid more allocations when compiling html5ever][37373]
4828 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4829 * [Avoid some allocations in the macro parser][37318]
4830 * [Use a faster deflate setting][37298]
4831 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4832 during interning of slices][37270]
4833 * [Optimize `write_metadata`][37267]
4834 * [Don't process obligation forest cycles when stalled][37231]
4835 * [Avoid many `CrateConfig` clones][37161]
4836 * [Optimize `Substs::super_fold_with`][37108]
4837 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4838 * [Speed up `plug_leaks`][36917]
4843 * [`println!()`, with no arguments, prints newline][36825].
4844 Previously, an empty string was required to achieve the same.
4845 * [`Wrapping` impls standard binary and unary operators, as well as
4846 the `Sum` and `Product` iterators][37356]
4847 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4849 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4850 `VecDeque` iterators][37315]
4851 * [Improve `SipHasher` performance on small values][37312]
4852 * [Add Iterator trait TrustedLen to enable better FromIterator /
4854 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4855 * [`ReadDir` implements `Debug`][37221]
4856 * [Implement `RefUnwindSafe` for atomic types][37178]
4857 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4858 * [Avoid allocations in `Decoder::read_str`][37064]
4859 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4860 * [Impl `Debug` for raw pointers to unsized data][36880]
4861 * [Don't reuse `HashMap` random seeds][37470]
4862 * [The internal memory layout of `HashMap` is more cache-friendly, for
4863 significant improvements in some operations][36692]
4864 * [`HashMap` uses less memory on 32-bit architectures][36595]
4865 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4870 * [Expose rustc cfg values to build scripts][cargo/3243]
4871 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4872 * [Fix passing --features when testing multiple packages][cargo/3280]
4873 * [Use a single profile set per workspace][cargo/3249]
4874 * [Load `replace` sections from lock files][cargo/3220]
4875 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4880 * [rustup is the recommended Rust installation method][1.14rustup]
4881 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4882 S390x. These are [tier 2] platforms and may have major defects. Follow the
4883 instructions on the website to install, or add the targets to an existing
4884 installation with `rustup target add`. The new target triples are:
4885 - `mips-unknown-linux-gnu`
4886 - `mipsel-unknown-linux-gnu`
4887 - `mips64-unknown-linux-gnuabi64`
4888 - `mips64el-unknown-linux-gnuabi64 `
4889 - `powerpc-unknown-linux-gnu`
4890 - `powerpc64-unknown-linux-gnu`
4891 - `powerpc64le-unknown-linux-gnu`
4892 - `s390x-unknown-linux-gnu `
4893 * This release includes target (std) builds for ARM Linux running MUSL
4894 libc. These are [tier 2] platforms and may have major defects. Add the
4895 following triples to an existing rustup installation with `rustup target add`:
4896 - `arm-unknown-linux-musleabi`
4897 - `arm-unknown-linux-musleabihf`
4898 - `armv7-unknown-linux-musleabihf`
4899 * This release includes [experimental support for WebAssembly][1.14wasm], via
4900 the `wasm32-unknown-emscripten` target. This target is known to have major
4901 defects. Please test, report, and fix.
4902 * rustup no longer installs documentation by default. Run `rustup
4903 component add rust-docs` to install.
4904 * [Fix line stepping in debugger][37310]
4905 * [Enable line number debuginfo in releases][37280]
4910 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4911 * [Add support for Fuchsia OS][37313]
4912 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4917 * [A number of forward-compatibility lints used by the compiler
4918 to gradually introduce language changes have been converted
4919 to deny by default][36894]:
4920 - ["use of inaccessible extern crate erroneously allowed"][36886]
4921 - ["type parameter default erroneously allowed in invalid location"][36887]
4922 - ["detects super or self keywords at the beginning of global path"][36888]
4923 - ["two overlapping inherent impls define an item with the same name
4924 were erroneously allowed"][36889]
4925 - ["floating-point constants cannot be used in patterns"][36890]
4926 - ["constants of struct or enum type can only be used in a pattern if
4927 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4928 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4929 * [Prohibit patterns in trait methods without bodies][37378]
4930 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4931 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4932 * [The `$crate` macro variable is accepted in fewer locations][37213]
4933 * [Impls specifying extra region requirements beyond the trait
4934 they implement are rejected][37167]
4935 * [Enums may not be unsized][37111]. Unsized enums are intended to
4936 work but never have. For now they are forbidden.
4937 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4939 [tier 2]: https://forge.rust-lang.org/platform-support.html
4940 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4941 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4942 [36430]: https://github.com/rust-lang/rust/pull/36430
4943 [36595]: https://github.com/rust-lang/rust/pull/36595
4944 [36595]: https://github.com/rust-lang/rust/pull/36595
4945 [36692]: https://github.com/rust-lang/rust/pull/36692
4946 [36767]: https://github.com/rust-lang/rust/pull/36767
4947 [36794]: https://github.com/rust-lang/rust/pull/36794
4948 [36798]: https://github.com/rust-lang/rust/pull/36798
4949 [36819]: https://github.com/rust-lang/rust/pull/36819
4950 [36822]: https://github.com/rust-lang/rust/pull/36822
4951 [36825]: https://github.com/rust-lang/rust/pull/36825
4952 [36843]: https://github.com/rust-lang/rust/pull/36843
4953 [36880]: https://github.com/rust-lang/rust/pull/36880
4954 [36886]: https://github.com/rust-lang/rust/issues/36886
4955 [36887]: https://github.com/rust-lang/rust/issues/36887
4956 [36888]: https://github.com/rust-lang/rust/issues/36888
4957 [36889]: https://github.com/rust-lang/rust/issues/36889
4958 [36890]: https://github.com/rust-lang/rust/issues/36890
4959 [36891]: https://github.com/rust-lang/rust/issues/36891
4960 [36892]: https://github.com/rust-lang/rust/issues/36892
4961 [36894]: https://github.com/rust-lang/rust/pull/36894
4962 [36917]: https://github.com/rust-lang/rust/pull/36917
4963 [36993]: https://github.com/rust-lang/rust/pull/36993
4964 [37037]: https://github.com/rust-lang/rust/pull/37037
4965 [37064]: https://github.com/rust-lang/rust/pull/37064
4966 [37094]: https://github.com/rust-lang/rust/pull/37094
4967 [37108]: https://github.com/rust-lang/rust/pull/37108
4968 [37111]: https://github.com/rust-lang/rust/pull/37111
4969 [37161]: https://github.com/rust-lang/rust/pull/37161
4970 [37162]: https://github.com/rust-lang/rust/pull/37162
4971 [37167]: https://github.com/rust-lang/rust/pull/37167
4972 [37178]: https://github.com/rust-lang/rust/pull/37178
4973 [37200]: https://github.com/rust-lang/rust/pull/37200
4974 [37213]: https://github.com/rust-lang/rust/pull/37213
4975 [37221]: https://github.com/rust-lang/rust/pull/37221
4976 [37224]: https://github.com/rust-lang/rust/pull/37224
4977 [37230]: https://github.com/rust-lang/rust/pull/37230
4978 [37231]: https://github.com/rust-lang/rust/pull/37231
4979 [37247]: https://github.com/rust-lang/rust/pull/37247
4980 [37267]: https://github.com/rust-lang/rust/pull/37267
4981 [37270]: https://github.com/rust-lang/rust/pull/37270
4982 [37273]: https://github.com/rust-lang/rust/pull/37273
4983 [37280]: https://github.com/rust-lang/rust/pull/37280
4984 [37298]: https://github.com/rust-lang/rust/pull/37298
4985 [37306]: https://github.com/rust-lang/rust/pull/37306
4986 [37310]: https://github.com/rust-lang/rust/pull/37310
4987 [37312]: https://github.com/rust-lang/rust/pull/37312
4988 [37313]: https://github.com/rust-lang/rust/pull/37313
4989 [37315]: https://github.com/rust-lang/rust/pull/37315
4990 [37318]: https://github.com/rust-lang/rust/pull/37318
4991 [37322]: https://github.com/rust-lang/rust/pull/37322
4992 [37326]: https://github.com/rust-lang/rust/pull/37326
4993 [37351]: https://github.com/rust-lang/rust/pull/37351
4994 [37356]: https://github.com/rust-lang/rust/pull/37356
4995 [37367]: https://github.com/rust-lang/rust/pull/37367
4996 [37373]: https://github.com/rust-lang/rust/pull/37373
4997 [37378]: https://github.com/rust-lang/rust/pull/37378
4998 [37389]: https://github.com/rust-lang/rust/pull/37389
4999 [37392]: https://github.com/rust-lang/rust/pull/37392
5000 [37427]: https://github.com/rust-lang/rust/pull/37427
5001 [37439]: https://github.com/rust-lang/rust/pull/37439
5002 [37445]: https://github.com/rust-lang/rust/pull/37445
5003 [37470]: https://github.com/rust-lang/rust/pull/37470
5004 [37569]: https://github.com/rust-lang/rust/pull/37569
5005 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5006 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5007 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5008 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5009 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5010 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5011 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5014 Version 1.13.0 (2016-11-10)
5015 ===========================
5020 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5021 errors, like the `try!` macro, described in [RFC 0243].
5022 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5023 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5024 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5025 * [Fix lifetime rules for 'if' conditions][36029]
5026 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5031 * [Add the `-C link-arg` argument][36574]
5032 * [Remove the old AST-based backend from rustc_trans][35764]
5033 * [Don't enable NEON by default on armv7 Linux][35814]
5034 * [Fix debug line number info for macro expansions][35238]
5035 * [Do not emit "class method" debuginfo for types that are not
5036 DICompositeType][36008]
5037 * [Warn about multiple conflicting #[repr] hints][34623]
5038 * [When sizing DST, don't double-count nested struct prefixes][36351]
5039 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5040 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5041 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5042 * [Expand macros without recursing to avoid stack overflows][36214]
5047 * [Replace macro backtraces with labeled local uses][35702]
5048 * [Improve error message for misplaced doc comments][33922]
5049 * [Buffer unix and lock windows to prevent message interleaving][35975]
5050 * [Update lifetime errors to specifically note temporaries][36171]
5051 * [Special case a few colors for Windows][36178]
5052 * [Suggest `use self` when such an import resolves][36289]
5053 * [Be more specific when type parameter shadows primitive type][36338]
5054 * Many minor improvements
5056 Compile-time Optimizations
5057 --------------------------
5059 * [Compute and cache HIR hashes at beginning][35854]
5060 * [Don't hash types in loan paths][36004]
5061 * [Cache projections in trans][35761]
5062 * [Optimize the parser's last token handling][36527]
5063 * [Only instantiate #[inline] functions in codegen units referencing
5064 them][36524]. This leads to big improvements in cases where crates export
5065 define many inline functions without using them directly.
5066 * [Lazily allocate TypedArena's first chunk][36592]
5067 * [Don't allocate during default HashSet creation][36734]
5074 * [`overflowing_abs`]
5075 * [`RefCell::try_borrow`]
5076 * [`RefCell::try_borrow_mut`]
5081 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5082 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5084 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5085 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5086 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5087 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5088 * [Use arc4rand on FreeBSD][35884]
5089 * [memrchr: Correct aligned offset computation][35969]
5090 * [Improve Demangling of Rust Symbols][36059]
5091 * [Use monotonic time in condition variables][35048]
5092 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5093 * [Implement conversion traits for `char`][35755]
5094 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5095 * [Zero first byte of CString on drop][36264]
5096 * [Inherit overflow checks for sum and product][36372]
5097 * [Add missing Eq implementations][36423]
5098 * [Implement `Debug` for `DirEntry`][36631]
5099 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5101 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5102 * [Implement more traits for `std::io::ErrorKind`][35911]
5103 * [Optimize BinaryHeap bounds checking][36072]
5104 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5105 `extend_with_element`][36355]
5106 * [Fix overflow checking in unsigned pow()][34942]
5111 * This release includes security fixes to both curl and OpenSSL.
5112 * [Fix transitive doctests when panic=abort][cargo/3021]
5113 * [Add --all-features flag to cargo][cargo/3038]
5114 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5115 * [Don't parse the home directory more than once][cargo/3078]
5116 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5117 * [Update OpenSSL to 1.0.2j][cargo/3121]
5118 * [Add license and license_file to cargo metadata output][cargo/3110]
5119 * [Make crates-io registry URL optional in config; ignore all changes to
5120 source.crates-io][cargo/3089]
5121 * [Don't download dependencies from other platforms][cargo/3123]
5122 * [Build transitive dev-dependencies when needed][cargo/3125]
5123 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5124 * [Avoid updating registry when adding existing deps][cargo/3144]
5125 * [Warn about path overrides that won't work][cargo/3136]
5126 * [Use workspaces during `cargo install`][cargo/3146]
5127 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5128 * [Add --message-format flag][cargo/3000]
5129 * [Pass target environment for rustdoc][cargo/3205]
5130 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5131 * [Update curl and curl-sys][cargo/3241]
5132 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5137 * [rustdoc: Add the `--sysroot` argument][36586]
5138 * [rustdoc: Fix a couple of issues with the search results][35655]
5139 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5140 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5141 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5146 * [Remove unmaintained style guide][35124]
5147 * [Add s390x support][36369]
5148 * [Initial work at Haiku OS support][36727]
5149 * [Add mips-uclibc targets][35734]
5150 * [Crate-ify compiler-rt into compiler-builtins][35021]
5151 * [Add rustc version info (git hash + date) to dist tarball][36213]
5152 * Many documentation improvements
5157 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5158 * [Deny (by default) transmuting from fn item types to pointer-sized
5159 types][34923]. Continuing the long transition to zero-sized fn items,
5161 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5163 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5164 * [Fix lifetime rules for 'if' conditions][36029].
5165 * [Inherit overflow checks for sum and product][36372].
5166 * [Forbid user-defined macros named "macro_rules"][36730].
5168 [33922]: https://github.com/rust-lang/rust/pull/33922
5169 [34623]: https://github.com/rust-lang/rust/pull/34623
5170 [34923]: https://github.com/rust-lang/rust/pull/34923
5171 [34942]: https://github.com/rust-lang/rust/pull/34942
5172 [34982]: https://github.com/rust-lang/rust/pull/34982
5173 [35021]: https://github.com/rust-lang/rust/pull/35021
5174 [35048]: https://github.com/rust-lang/rust/pull/35048
5175 [35074]: https://github.com/rust-lang/rust/pull/35074
5176 [35124]: https://github.com/rust-lang/rust/pull/35124
5177 [35234]: https://github.com/rust-lang/rust/pull/35234
5178 [35238]: https://github.com/rust-lang/rust/pull/35238
5179 [35354]: https://github.com/rust-lang/rust/pull/35354
5180 [35559]: https://github.com/rust-lang/rust/pull/35559
5181 [35585]: https://github.com/rust-lang/rust/pull/35585
5182 [35627]: https://github.com/rust-lang/rust/pull/35627
5183 [35655]: https://github.com/rust-lang/rust/pull/35655
5184 [35702]: https://github.com/rust-lang/rust/pull/35702
5185 [35707]: https://github.com/rust-lang/rust/pull/35707
5186 [35728]: https://github.com/rust-lang/rust/pull/35728
5187 [35734]: https://github.com/rust-lang/rust/pull/35734
5188 [35755]: https://github.com/rust-lang/rust/pull/35755
5189 [35761]: https://github.com/rust-lang/rust/pull/35761
5190 [35764]: https://github.com/rust-lang/rust/pull/35764
5191 [35814]: https://github.com/rust-lang/rust/pull/35814
5192 [35854]: https://github.com/rust-lang/rust/pull/35854
5193 [35871]: https://github.com/rust-lang/rust/pull/35871
5194 [35884]: https://github.com/rust-lang/rust/pull/35884
5195 [35911]: https://github.com/rust-lang/rust/pull/35911
5196 [35969]: https://github.com/rust-lang/rust/pull/35969
5197 [35975]: https://github.com/rust-lang/rust/pull/35975
5198 [36004]: https://github.com/rust-lang/rust/pull/36004
5199 [36008]: https://github.com/rust-lang/rust/pull/36008
5200 [36014]: https://github.com/rust-lang/rust/pull/36014
5201 [36029]: https://github.com/rust-lang/rust/pull/36029
5202 [36059]: https://github.com/rust-lang/rust/pull/36059
5203 [36072]: https://github.com/rust-lang/rust/pull/36072
5204 [36101]: https://github.com/rust-lang/rust/pull/36101
5205 [36104]: https://github.com/rust-lang/rust/pull/36104
5206 [36171]: https://github.com/rust-lang/rust/pull/36171
5207 [36173]: https://github.com/rust-lang/rust/pull/36173
5208 [36178]: https://github.com/rust-lang/rust/pull/36178
5209 [36213]: https://github.com/rust-lang/rust/pull/36213
5210 [36214]: https://github.com/rust-lang/rust/pull/36214
5211 [36264]: https://github.com/rust-lang/rust/pull/36264
5212 [36266]: https://github.com/rust-lang/rust/pull/36266
5213 [36289]: https://github.com/rust-lang/rust/pull/36289
5214 [36338]: https://github.com/rust-lang/rust/pull/36338
5215 [36351]: https://github.com/rust-lang/rust/pull/36351
5216 [36355]: https://github.com/rust-lang/rust/pull/36355
5217 [36369]: https://github.com/rust-lang/rust/pull/36369
5218 [36372]: https://github.com/rust-lang/rust/pull/36372
5219 [36423]: https://github.com/rust-lang/rust/pull/36423
5220 [36482]: https://github.com/rust-lang/rust/pull/36482
5221 [36505]: https://github.com/rust-lang/rust/pull/36505
5222 [36524]: https://github.com/rust-lang/rust/pull/36524
5223 [36527]: https://github.com/rust-lang/rust/pull/36527
5224 [36551]: https://github.com/rust-lang/rust/pull/36551
5225 [36574]: https://github.com/rust-lang/rust/pull/36574
5226 [36586]: https://github.com/rust-lang/rust/pull/36586
5227 [36592]: https://github.com/rust-lang/rust/pull/36592
5228 [36631]: https://github.com/rust-lang/rust/pull/36631
5229 [36639]: https://github.com/rust-lang/rust/pull/36639
5230 [36721]: https://github.com/rust-lang/rust/pull/36721
5231 [36727]: https://github.com/rust-lang/rust/pull/36727
5232 [36730]: https://github.com/rust-lang/rust/pull/36730
5233 [36734]: https://github.com/rust-lang/rust/pull/36734
5234 [36754]: https://github.com/rust-lang/rust/pull/36754
5235 [36995]: https://github.com/rust-lang/rust/pull/36995
5236 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5237 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5238 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5239 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5240 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5241 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5242 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5243 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5244 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5245 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5246 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5247 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5248 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5249 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5250 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5251 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5252 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5253 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5254 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5255 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5256 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5257 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5258 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5259 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5260 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5261 [rustup]: https://www.rustup.rs
5262 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5263 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5264 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5265 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5266 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5267 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5268 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5271 Version 1.12.1 (2016-10-20)
5272 ===========================
5277 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5278 * [Confusion with double negation and booleans][36856]
5279 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5280 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5281 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5282 * [Corrupted memory after updated to 1.12][36936]
5283 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5284 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5285 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5287 [36381]: https://github.com/rust-lang/rust/issues/36381
5288 [36856]: https://github.com/rust-lang/rust/issues/36856
5289 [36875]: https://github.com/rust-lang/rust/issues/36875
5290 [36924]: https://github.com/rust-lang/rust/issues/36924
5291 [36926]: https://github.com/rust-lang/rust/issues/36926
5292 [36936]: https://github.com/rust-lang/rust/issues/36936
5293 [37026]: https://github.com/rust-lang/rust/issues/37026
5294 [37112]: https://github.com/rust-lang/rust/issues/37112
5295 [37153]: https://github.com/rust-lang/rust/issues/37153
5298 Version 1.12.0 (2016-09-29)
5299 ===========================
5304 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5305 This translation pass is far simpler than the previous AST->LLVM pass, and
5306 creates opportunities to perform new optimizations directly on the MIR. It
5307 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5308 * [`rustc` presents a new, more readable error format, along with
5309 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5310 Most common editors supporting Rust have been updated to work with it. It was
5311 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5316 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5317 This translation pass is far simpler than the previous AST->LLVM pass, and
5318 creates opportunities to perform new optimizations directly on the MIR. It
5319 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5320 * [Print the Rust target name, not the LLVM target name, with
5321 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5322 * [The computation of `TypeId` is correct in some cases where it was previously
5323 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5324 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5325 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5326 `--print relocation-models`, and `--print code-models` print the available
5327 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5328 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5329 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5330 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5331 These targets produce statically-linked binaries. There are no binary release
5337 * [`rustc` presents a new, more readable error format, along with
5338 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5339 Most common editors supporting Rust have been updated to work with it. It was
5340 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5341 * [In error descriptions, references are now described in plain English,
5342 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5343 * [In error type descriptions, unknown numeric types are named `{integer}` or
5344 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5345 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5350 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5351 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5352 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5353 useful](https://github.com/rust-lang/rust/pull/34908)
5354 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5355 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5356 * [Semicolons are properly required as statement delimiters inside
5357 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5358 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5363 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5364 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5365 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5366 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5367 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5368 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5369 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5370 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5371 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5372 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5373 Both on Unix and Windows.
5374 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5375 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5376 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5377 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5378 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5379 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5380 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5381 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5386 * [The `format!` macro and friends now allow a single argument to be formatted
5387 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5388 * [The lifetime bounds on `[T]::binary_search_by` and
5389 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5390 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5391 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5392 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5393 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5394 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5395 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5396 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5397 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5398 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5399 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5400 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5401 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5402 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5403 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5404 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5405 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5406 * [`mpsc::sync_channel` `Receiver`s return any available message before
5407 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5408 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5409 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5414 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5415 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5416 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5417 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5418 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5419 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5420 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5421 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5422 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5423 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5424 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5425 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5426 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5427 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5428 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5429 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5434 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5435 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5440 * [Test binaries now support a `--test-threads` argument to specify the number
5441 of threads used to run tests, and which acts the same as the
5442 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5443 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5444 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5445 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5446 * [Rust releases now come with source packages that can be installed by rustup
5447 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5448 The resulting source code can be used by tools and IDES, located in the
5449 sysroot under `lib/rustlib/src`.
5454 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5455 * Many minor improvements to the documentation.
5456 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5461 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5462 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5463 * [When formatting strings, if "precision" is specified, the "fill",
5464 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5465 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5468 Version 1.11.0 (2016-08-18)
5469 ===========================
5474 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5475 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5476 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5477 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5482 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5483 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5484 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5485 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5486 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5487 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5488 (in libcore - previously stabilized in libstd)
5489 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5490 (in libcore - previously stabilized in libstd)
5491 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5492 (in libcore - previously stabilized in libstd)
5493 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5494 (in libcore - previously stabilized in libstd)
5495 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5496 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5497 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5498 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5503 * [The `thread_local!` macro supports multiple definitions in a single
5504 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5505 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5506 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5507 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5508 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5509 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5510 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5511 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5516 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5517 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5518 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5519 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5520 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5521 and `-vv` prints warnings for all crates.
5522 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5523 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5524 This provides room for expansion by arbitrary tools.
5525 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5526 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5527 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5528 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5529 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5530 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5531 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5536 * [Caching projections speeds up type check dramatically for some
5537 workloads](https://github.com/rust-lang/rust/pull/33816)
5538 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5539 This hasher is faster, but is believed to provide sufficient
5540 protection from collision attacks.
5541 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5546 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5547 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5548 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5549 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5550 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5555 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5556 * [When emitting debug info, rustc emits frame pointers for closures,
5557 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5558 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5559 * Many more errors have been given error codes and extended
5561 * API documentation continues to be improved, with many new examples
5566 * [rustc no longer hangs when dependencies recursively re-export
5567 submodules](https://github.com/rust-lang/rust/pull/34542)
5568 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5569 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5570 rewritten](https://github.com/rust-lang/rust/pull/33895)
5571 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5572 No targets use this yet, but it works toward AVR support.
5577 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5578 * [The new follow-set rules that place restrictions on `macro_rules!`
5579 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5580 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5581 and has been a warning since 1.10.
5582 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5583 This causes breakage in some corner cases.
5586 Version 1.10.0 (2016-07-07)
5587 ===========================
5592 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5593 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5594 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5595 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5596 * [`panic!` can be converted to a runtime abort with the
5597 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5598 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5599 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5600 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5601 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5602 Note that Cargo does not yet directly support cdylibs.
5607 * `os::windows::fs::OpenOptionsExt::access_mode`
5608 * `os::windows::fs::OpenOptionsExt::share_mode`
5609 * `os::windows::fs::OpenOptionsExt::custom_flags`
5610 * `os::windows::fs::OpenOptionsExt::attributes`
5611 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5612 * `os::unix::fs::OpenOptionsExt::custom_flags`
5613 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5614 * `Default for sync::Weak`
5615 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5616 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5617 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5618 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5619 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5620 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5621 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5622 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5623 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5624 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5625 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5626 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5627 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5628 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5629 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5630 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5631 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5632 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5633 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5634 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5635 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5636 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5637 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5638 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5639 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5640 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5641 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5642 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5643 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5644 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5645 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5646 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5647 * Read/Write/RawFd impls for `UnixStream`
5648 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5649 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5650 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5651 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5652 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5653 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5654 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5655 * RawFd impls for `UnixListener`
5656 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5657 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5658 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5659 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5660 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5661 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5662 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5663 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5664 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5665 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5666 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5667 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5668 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5669 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5670 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5671 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5672 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5673 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5674 * RawFd impls for `UnixDatagram`
5675 * `{BTree,Hash}Map::values_mut`
5676 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5681 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5682 The semantics of this minor method are subtle and probably not what
5684 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5685 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5686 will fall back to `/dev/urandom` temporarily to avoid blocking
5687 during early boot](https://github.com/rust-lang/rust/pull/33086).
5688 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5689 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5690 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5691 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5692 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5693 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5694 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5698 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5699 This controls the runtime behavior of the `panic!` macro
5700 and can be either "unwind" (the default), or "abort".
5701 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5702 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5703 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5704 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5705 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5706 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5707 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5708 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5709 By default they are retried twice, which can be customized with the
5710 `net.retry` value in `.cargo/config`.
5711 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5712 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5713 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5714 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5715 Makes it possible to install multiple crates in parallel.
5716 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5717 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5718 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5719 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5720 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5721 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5726 * [rustc memory usage was reduced by refactoring the context used for
5727 type checking](https://github.com/rust-lang/rust/pull/33425).
5728 * [Speed up creation of `HashMap`s by caching the random keys used
5729 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5730 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5731 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5732 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5733 10x faster than the previous lookup tables.
5734 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5739 * Many incremental improvements to documentation and rustdoc.
5740 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5741 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5742 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5743 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5744 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5745 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5746 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5751 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5752 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5753 * [`std` no longer prints backtraces on platforms where the running
5754 module must be loaded with `env::current_exe`, which can't be relied
5755 on](https://github.com/rust-lang/rust/pull/33554).
5756 * This release includes std binaries for the i586-unknown-linux-gnu,
5757 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5758 i586 target is for old x86 hardware without SSE2, and the armv7
5759 target is for Android running on modern ARM architectures.
5760 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5761 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5762 * [On Unix the runtime aborts by calling `libc::abort` instead of
5763 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5764 * [Rust is now bootstrapped from the previous release of Rust,
5765 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5770 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5771 * [`target_env` for Linux ARM targets is just `gnu`, not
5772 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5773 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5774 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5775 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5776 Affects how macros are parsed.
5777 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5778 * [Feature-gated attributes on macro-generated macro invocations are
5779 now rejected](https://github.com/rust-lang/rust/pull/32791).
5780 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5781 This caused some minor changes to type inference.
5784 Version 1.9.0 (2016-05-26)
5785 ==========================
5790 * The `#[deprecated]` attribute when applied to an API will generate
5791 warnings when used. The warnings may be suppressed with
5792 `#[allow(deprecated)]`. [RFC 1270].
5793 * [`fn` item types are zero sized, and each `fn` names a unique
5794 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5795 `transmute` on a `fn` type will generate a warning for a few cycles,
5796 then will be converted to an error.
5797 * [Field and method resolution understand visibility, so private
5798 fields and methods cannot prevent the proper use of public fields
5799 and methods][1.9fv].
5800 * [The parser considers unicode codepoints in the
5801 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5807 * [`std::panic::catch_unwind`] (renamed from `recover`)
5808 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5809 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5810 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5811 * [`str::is_char_boundary`]
5812 * [`<*const T>::as_ref`]
5813 * [`<*mut T>::as_ref`]
5814 * [`<*mut T>::as_mut`]
5815 * [`AsciiExt::make_ascii_uppercase`]
5816 * [`AsciiExt::make_ascii_lowercase`]
5817 * [`char::decode_utf16`]
5818 * [`char::DecodeUtf16`]
5819 * [`char::DecodeUtf16Error`]
5820 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5821 * [`BTreeSet::take`]
5822 * [`BTreeSet::replace`]
5825 * [`HashSet::replace`]
5827 * [`OsString::with_capacity`]
5828 * [`OsString::clear`]
5829 * [`OsString::capacity`]
5830 * [`OsString::reserve`]
5831 * [`OsString::reserve_exact`]
5832 * [`OsStr::is_empty`]
5834 * [`std::os::unix::thread`]
5837 * [`JoinHandleExt::as_pthread_t`]
5838 * [`JoinHandleExt::into_pthread_t`]
5839 * [`HashSet::hasher`]
5840 * [`HashMap::hasher`]
5841 * [`CommandExt::exec`]
5842 * [`File::try_clone`]
5843 * [`SocketAddr::set_ip`]
5844 * [`SocketAddr::set_port`]
5845 * [`SocketAddrV4::set_ip`]
5846 * [`SocketAddrV4::set_port`]
5847 * [`SocketAddrV6::set_ip`]
5848 * [`SocketAddrV6::set_port`]
5849 * [`SocketAddrV6::set_flowinfo`]
5850 * [`SocketAddrV6::set_scope_id`]
5851 * [`slice::copy_from_slice`]
5852 * [`ptr::read_volatile`]
5853 * [`ptr::write_volatile`]
5854 * [`OpenOptions::create_new`]
5855 * [`TcpStream::set_nodelay`]
5856 * [`TcpStream::nodelay`]
5857 * [`TcpStream::set_ttl`]
5858 * [`TcpStream::ttl`]
5859 * [`TcpStream::set_only_v6`]
5860 * [`TcpStream::only_v6`]
5861 * [`TcpStream::take_error`]
5862 * [`TcpStream::set_nonblocking`]
5863 * [`TcpListener::set_ttl`]
5864 * [`TcpListener::ttl`]
5865 * [`TcpListener::set_only_v6`]
5866 * [`TcpListener::only_v6`]
5867 * [`TcpListener::take_error`]
5868 * [`TcpListener::set_nonblocking`]
5869 * [`UdpSocket::set_broadcast`]
5870 * [`UdpSocket::broadcast`]
5871 * [`UdpSocket::set_multicast_loop_v4`]
5872 * [`UdpSocket::multicast_loop_v4`]
5873 * [`UdpSocket::set_multicast_ttl_v4`]
5874 * [`UdpSocket::multicast_ttl_v4`]
5875 * [`UdpSocket::set_multicast_loop_v6`]
5876 * [`UdpSocket::multicast_loop_v6`]
5877 * [`UdpSocket::set_multicast_ttl_v6`]
5878 * [`UdpSocket::multicast_ttl_v6`]
5879 * [`UdpSocket::set_ttl`]
5880 * [`UdpSocket::ttl`]
5881 * [`UdpSocket::set_only_v6`]
5882 * [`UdpSocket::only_v6`]
5883 * [`UdpSocket::join_multicast_v4`]
5884 * [`UdpSocket::join_multicast_v6`]
5885 * [`UdpSocket::leave_multicast_v4`]
5886 * [`UdpSocket::leave_multicast_v6`]
5887 * [`UdpSocket::take_error`]
5888 * [`UdpSocket::connect`]
5889 * [`UdpSocket::send`]
5890 * [`UdpSocket::recv`]
5891 * [`UdpSocket::set_nonblocking`]
5896 * [`std::sync::Once` is poisoned if its initialization function
5898 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5899 * [Most types implement `fmt::Debug`][1.9db].
5900 * [The default buffer size used by `BufReader` and `BufWriter` was
5901 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5902 used by other languages.
5903 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5904 `Duration` additionally implements `*=` and `/=`][1.9ta].
5905 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5906 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5907 * [`Chain` implements `BufRead`][1.9ch].
5908 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5913 * [Cargo can now run concurrently][1.9cc].
5914 * [Top-level overrides allow specific revisions of crates to be
5915 overridden through the entire crate graph][1.9ct]. This is intended
5916 to make upgrades easier for large projects, by allowing crates to be
5917 forked temporarily until they've been upgraded and republished.
5918 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5919 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5920 on the commandline][1.9cf]. `rustc` arguments can also be specified
5921 in the `build.rustflags` configuration key.
5926 * [The time complexity of comparing variables for equivalence during type
5927 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5928 to major compilation time improvement in some scenarios.
5929 * [`ToString` is specialized for `str`, giving it the same performance
5930 as `to_owned`][1.9ts].
5931 * [Spawning processes with `Command::output` no longer creates extra
5933 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5934 for C-like enums][1.9cl].
5939 * [Passing the `--quiet` flag to a test runner will produce
5940 much-abbreviated output][1.9q].
5941 * The Rust Project now publishes std binaries for the
5942 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5943 `i586-pc-windows-msvc` targets.
5948 * [`std::sync::Once` is poisoned if its initialization function
5950 * [It is illegal to define methods with the same name in overlapping
5951 inherent `impl` blocks][1.9sn].
5952 * [`fn` item types are zero sized, and each `fn` names a unique
5953 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5954 `transmute` on a `fn` type will generate a warning for a few cycles,
5955 then will be converted to an error.
5956 * [Improvements to const evaluation may trigger new errors when integer
5957 literals are out of range][1.9ce].
5960 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5961 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5962 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5963 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5964 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5965 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5966 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5967 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5968 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5969 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5970 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5971 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5972 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5973 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5974 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5975 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5976 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5977 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5978 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5979 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5980 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5981 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5982 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5983 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5984 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5985 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5986 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5987 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5988 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5989 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5990 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5991 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5992 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5993 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5994 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5995 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5996 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5997 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5998 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5999 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6000 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6001 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6002 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6003 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6004 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6005 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6006 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6007 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6008 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6009 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6010 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6011 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6012 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6013 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6014 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6015 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6016 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6017 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6018 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6019 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6020 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6021 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6022 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6023 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6024 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6025 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6026 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6027 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6028 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6029 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6030 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6031 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6032 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6033 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6034 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6035 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6036 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6037 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6038 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6039 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6040 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6041 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6042 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6043 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6044 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6045 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6046 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6047 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6048 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6049 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6050 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6051 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6052 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6053 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6054 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6055 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6056 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6057 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6058 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6059 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6060 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6061 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6062 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6063 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6064 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6065 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6066 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6067 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6068 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6069 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6072 Version 1.8.0 (2016-04-14)
6073 ==========================
6078 * Rust supports overloading of compound assignment statements like
6079 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6080 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6081 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6083 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6084 addition to the non-braced form, `struct Foo;`. [RFC 218].
6090 * [`str::encode_utf16`] (renamed from `utf16_units`)
6091 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6094 * [`ptr::drop_in_place`]
6096 * [`time::SystemTime`]
6098 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6099 * [`Instant::elapsed`]
6100 * [`SystemTime::now`]
6101 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6102 * [`SystemTime::elapsed`]
6103 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6104 * [`SystemTimeError`]
6105 * [`SystemTimeError::duration`]
6106 * Various impls for `SystemTimeError`
6108 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6109 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6110 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6111 * [The `write!` and `writeln!` macros correctly emit errors if any of
6112 their arguments can't be formatted][1.8w].
6113 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6114 * [The Unix-specific `raw` modules, which contain a number of
6115 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6116 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6117 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6118 across platforms was making it difficult to implement `std`
6119 correctly. Those that need these definitions should use the `libc`
6121 * The Unix-specific `MetadataExt` traits, including
6122 `os::unix::fs::MetadataExt`, which expose values such as inode
6123 numbers [no longer return platform-specific types][1.8r], but
6124 instead return widened integers. [RFC 1415].
6125 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6126 * [Atomic loads and stores are not volatile][1.8a].
6127 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6132 * [Inlining hash functions lead to a 3% compile-time improvement in
6133 some workloads][1.8h].
6134 * When using jemalloc, its symbols are [unprefixed so that it
6135 overrides the libc malloc implementation][1.8h]. This means that for
6136 rustc, LLVM is now using jemalloc, which results in a 6%
6137 compile-time improvement on a specific workload.
6138 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6143 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6144 i686-pc-windows-msvc is now considered a tier-1 platform.
6145 * [The `--print targets` flag prints a list of supported targets][1.8t].
6146 * [The `--print cfg` flag prints the `cfg`s defined for the current
6148 * [`rustc` can be built with an new Cargo-based build system, written
6149 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6150 build system. To enable it configure with `configure --rustbuild`.
6151 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6152 variants while also indicating the total number of missing variants
6153 if more than 3][1.8m].
6154 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6155 * The Rust Project now publishes binary releases of the standard
6156 library for a number of tier-2 targets:
6157 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6158 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6159 `x86_64-rumprun-netbsd`. These can be installed with
6160 tools such as [multirust][1.8mr].
6165 * [`cargo init` creates a new Cargo project in the current
6166 directory][1.8ci]. It is otherwise like `cargo new`.
6167 * [Cargo has configuration keys for `-v` and
6168 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6169 `[term]` section of `.cargo/config`.
6170 * [Configuration keys that evaluate to strings or integers can be set
6171 via environment variables][1.8ce]. For example the `build.jobs` key
6172 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6173 precedence over config files.
6174 * [Target-specific dependencies support Rust `cfg` syntax for
6175 describing targets][1.8cfg] so that dependencies for multiple
6176 targets can be specified together. [RFC 1361].
6177 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6178 `RUSTDOC` take precedence over the `build.target-dir`,
6179 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6180 * [The child process tree is killed on Windows when Cargo is
6182 * [The `build.target` configuration value sets the target platform,
6183 like `--target`][1.8ct].
6188 * [Unstable compiler flags have been further restricted][1.8u]. Since
6189 1.0 `-Z` flags have been considered unstable, and other flags that
6190 were considered unstable additionally required passing `-Z
6191 unstable-options` to access. Unlike unstable language and library
6192 features though, these options have been accessible on the stable
6193 release channel. Going forward, *new unstable flags will not be
6194 available on the stable release channel*, and old unstable flags
6195 will warn about their usage. In the future, all unstable flags will
6196 be unavailable on the stable release channel.
6197 * [It is no longer possible to `match` on empty enum variants using
6198 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6199 * The Unix-specific `MetadataExt` traits, including
6200 `os::unix::fs::MetadataExt`, which expose values such as inode
6201 numbers [no longer return platform-specific types][1.8r], but
6202 instead return widened integers. [RFC 1415].
6203 * [Modules sourced from the filesystem cannot appear within arbitrary
6204 blocks, but only within other modules][1.8mf].
6205 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6206 * On Unix, [stack overflow triggers a runtime abort instead of a
6208 * [`Command::spawn` and its equivalents return an error if any of
6209 its command-line arguments contain interior `NUL`s][1.8n].
6210 * [Tuple and unit enum variants from other crates are in the type
6212 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6213 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6214 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6215 instead of `foo.lib`.
6218 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6219 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6220 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6221 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6222 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6223 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6224 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6225 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6226 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6227 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6228 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6229 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6230 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6231 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6232 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6233 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6234 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6235 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6236 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6237 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6238 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6239 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6240 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6241 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6242 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6243 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6244 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6245 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6246 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6247 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6248 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6249 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6250 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6251 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6252 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6253 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6254 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6255 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6256 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6257 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6258 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6259 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6260 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6261 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6262 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6263 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6264 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6265 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6266 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6267 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6268 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6269 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6270 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6271 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6272 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6273 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6274 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6275 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6276 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6277 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6280 Version 1.7.0 (2016-03-03)
6281 ==========================
6288 * [`Path::strip_prefix`] (renamed from relative_from)
6289 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6291 * [`Ipv4Addr::is_loopback`]
6292 * [`Ipv4Addr::is_private`]
6293 * [`Ipv4Addr::is_link_local`]
6294 * [`Ipv4Addr::is_multicast`]
6295 * [`Ipv4Addr::is_broadcast`]
6296 * [`Ipv4Addr::is_documentation`]
6298 * [`Ipv6Addr::is_unspecified`]
6299 * [`Ipv6Addr::is_loopback`]
6300 * [`Ipv6Addr::is_multicast`]
6303 * [`Vec::as_mut_slice`]
6305 * [`String::as_str`]
6306 * [`String::as_mut_str`]
6308 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6310 * `<[T]>::`[`sort_by_key`]
6311 * checked, saturated, and overflowing operations
6312 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6313 * [`i32::saturating_mul`]
6314 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6315 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6316 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6317 * [`u32::saturating_mul`]
6318 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6319 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6320 * and checked, saturated, and overflowing operations for other primitive types
6322 * [`ffi::IntoStringError`]
6323 * [`CString::into_string`]
6324 * [`CString::into_bytes`]
6325 * [`CString::into_bytes_with_nul`]
6326 * `From<CString> for Vec<u8>`
6328 * [`IntoStringError::into_cstring`]
6329 * [`IntoStringError::utf8_error`]
6330 * `Error for IntoStringError`
6332 * [`std::hash::BuildHasher`]
6333 * [`BuildHasher::Hasher`]
6334 * [`BuildHasher::build_hasher`]
6335 * [`std::hash::BuildHasherDefault`]
6336 * [`HashMap::with_hasher`]
6337 * [`HashMap::with_capacity_and_hasher`]
6338 * [`HashSet::with_hasher`]
6339 * [`HashSet::with_capacity_and_hasher`]
6340 * [`std::collections::hash_map::RandomState`]
6341 * [`RandomState::new`]
6342 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6343 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6344 from bytes is faster.
6345 * [The performance of `LineWriter` (and thus `io::stdout`) was
6346 improved by using `memchr` to search for newlines][1.7m].
6347 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6348 `f64` variants were stabilized previously.
6349 * [`BTreeMap` was rewritten to use less memory and improve the performance
6350 of insertion and iteration, the latter by as much as 5x][1.7bm].
6351 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6352 covariant over their contained type][1.7bt].
6353 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6354 over their contained type][1.7ll].
6355 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6357 * [`Any` is implemented for unsized types][1.7a].
6358 * [`Hash` is implemented for `Duration`][1.7h].
6363 * [When running tests with `--test`, rustdoc will pass `--cfg`
6364 arguments to the compiler][1.7dt].
6365 * [The compiler is built with RPATH information by default][1.7rpa].
6366 This means that it will be possible to run `rustc` when installed in
6367 unusual configurations without configuring the dynamic linker search
6369 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6370 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6371 over `LD_LIBRARY_PATH`.
6376 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6377 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6378 * [The `rerun-if-changed` build script directive no longer causes the
6379 build script to incorrectly run twice in certain scenarios][1.7rr].
6384 * Soundness fixes to the interactions between associated types and
6385 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6386 code that violates the new rules. This is a significant change that
6387 is known to break existing code, so it has emitted warnings for the
6388 new error cases since 1.4 to give crate authors time to adapt. The
6389 details of what is changing are subtle; read the RFC for more.
6390 * [Several bugs in the compiler's visibility calculations were
6391 fixed][1.7v]. Since this was found to break significant amounts of
6392 code, the new errors will be emitted as warnings for several release
6393 cycles, under the `private_in_public` lint.
6394 * Defaulted type parameters were accidentally accepted in positions
6395 that were not intended. In this release, [defaulted type parameters
6396 appearing outside of type definitions will generate a
6397 warning][1.7d], which will become an error in future releases.
6398 * [Parsing "." as a float results in an error instead of 0][1.7p].
6399 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6400 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6402 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6403 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6404 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6405 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6406 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6407 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6408 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6409 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6410 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6411 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6412 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6413 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6414 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6415 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6416 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6417 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6418 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6419 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6420 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6421 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6422 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6423 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6424 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6425 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6426 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6427 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6428 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6429 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6430 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6431 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6432 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6433 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6434 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6435 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6436 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6437 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6438 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6439 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6440 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6441 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6442 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6443 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6444 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6445 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6446 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6447 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6448 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6449 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6450 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6451 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6452 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6453 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6454 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6455 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6456 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6457 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6458 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6459 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6460 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6461 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6462 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6463 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6464 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6465 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6466 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6467 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6468 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6469 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6470 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6471 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6472 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6473 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6474 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6475 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6476 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6477 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6478 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6479 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6480 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6483 Version 1.6.0 (2016-01-21)
6484 ==========================
6489 * The `#![no_std]` attribute causes a crate to not be linked to the
6490 standard library, but only the [core library][1.6co], as described
6491 in [RFC 1184]. The core library defines common types and traits but
6492 has no platform dependencies whatsoever, and is the basis for Rust
6493 software in environments that cannot support a full port of the
6494 standard library, such as operating systems. Most of the core
6495 library is now stable.
6501 [`Read::read_exact`],
6502 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6503 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6504 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6505 [`os::unix::fs::DirBuilderExt`],
6506 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6507 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6508 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6509 [`collections::hash_map::Drain`],
6510 [`collections::hash_map::HashMap::drain`],
6511 [`collections::hash_set::Drain`],
6512 [`collections::hash_set::HashSet::drain`],
6513 [`collections::binary_heap::Drain`],
6514 [`collections::binary_heap::BinaryHeap::drain`],
6515 [`Vec::extend_from_slice`] (renamed from `push_all`),
6516 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6517 [`RwLock::into_inner`],
6518 [`Iterator::min_by_key`] (renamed from `min_by`),
6519 [`Iterator::max_by_key`] (renamed from `max_by`).
6520 * The [core library][1.6co] is stable, as are most of its APIs.
6521 * [The `assert_eq!` macro supports arguments that don't implement
6522 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6524 * Several timer functions that take duration in milliseconds [are
6525 deprecated in favor of those that take `Duration`][1.6ms]. These
6526 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6527 `thread::park_timeout_ms`.
6528 * The algorithm by which `Vec` reserves additional elements was
6529 [tweaked to not allocate excessive space][1.6a] while still growing
6531 * `From` conversions are [implemented from integers to floats][1.6f]
6532 in cases where the conversion is lossless. Thus they are not
6533 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6534 or `f64`. They are also not implemented for `isize` and `usize`
6535 because the implementations would be platform-specific. `From` is
6536 also implemented from `f32` to `f64`.
6537 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6538 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6539 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6540 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6542 * Sorting slices that are already sorted [is 50% faster in some
6548 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6549 * Cargo build scripts can specify their dependencies by emitting the
6550 [`rerun-if-changed`][1.6rr] key.
6551 * crates.io will reject publication of crates with dependencies that
6552 have a wildcard version constraint. Crates with wildcard
6553 dependencies were seen to cause a variety of problems, as described
6554 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6556 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6557 release folder. A variety of artifacts that Cargo failed to clean
6558 are now correctly deleted.
6563 * The `unreachable_code` lint [warns when a function call's argument
6565 * The parser indicates [failures that may be caused by
6566 confusingly-similar Unicode characters][1.6uc]
6567 * Certain macro errors [are reported at definition time][1.6m], not
6573 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6574 environment variable when locating crates. This was a pre-cargo
6575 feature for integrating with the package manager that was
6576 accidentally never removed.
6577 * [A number of bugs were fixed in the privacy checker][1.6p] that
6578 could cause previously-accepted code to break.
6579 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6580 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6581 struct pattern syntax (`Foo(..)`) can no longer be used to match
6582 unit structs. This is a warning now, but will become an error in
6583 future releases. Patterns that share the same name as a const are
6585 * A bug was fixed that causes [rustc not to apply default type
6586 parameters][1.6xc] when resolving certain method implementations of
6587 traits defined in other crates.
6589 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6590 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6591 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6592 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6593 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6594 [1.6co]: http://doc.rust-lang.org/core/index.html
6595 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6596 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6597 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6598 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6599 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6600 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6601 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6602 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6603 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6604 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6605 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6606 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6607 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6608 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6609 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6610 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6611 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6612 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6613 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6614 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6615 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6616 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6617 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6618 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6619 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6620 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6621 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6622 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6623 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6624 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6625 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6626 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6627 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6628 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6629 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6630 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6631 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6632 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6633 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6634 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6635 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6638 Version 1.5.0 (2015-12-10)
6639 ==========================
6641 * ~700 changes, numerous bugfixes
6647 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6648 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6649 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6650 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6651 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6652 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6653 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6654 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6655 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6656 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6657 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6658 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6659 [`Path::read_link`], [`Path::symlink_metadata`],
6660 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6661 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6662 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6663 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6664 [`slice::split_first_mut`], [`slice::split_first`],
6665 [`slice::split_last_mut`], [`slice::split_last`],
6666 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6667 [`str::MatchIndices`], [`str::RMatchIndices`],
6668 [`str::match_indices`], [`str::rmatch_indices`],
6669 [`str::slice_mut_unchecked`], [`string::ParseError`].
6670 * Rust applications hosted on crates.io can be installed locally to
6671 `~/.cargo/bin` with the [`cargo install`] command. Among other
6672 things this makes it easier to augment Cargo with new subcommands:
6673 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6674 invoked as `cargo foo`.
6675 * Crates with wildcard (`*`) dependencies will [emit warnings when
6676 published][1.5w]. In 1.6 it will no longer be possible to publish
6677 crates with wildcard dependencies.
6682 * The rules determining when a particular lifetime must outlive
6683 a particular value (known as '[dropck]') have been [modified
6684 to not rely on parametricity][1.5p].
6685 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6686 and `Arc`][1.5a]. Because these smart pointer types implement
6687 `Deref`, this causes breakage in cases where the interior type
6688 contains methods of the same name.
6689 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6690 that they could drop their content. Soundness fix.
6691 * All method invocations are [properly checked][1.5wf1] for
6692 [well-formedness][1.5wf2]. Soundness fix.
6693 * Traits whose supertraits contain `Self` are [not object
6694 safe][1.5o]. Soundness fix.
6695 * Target specifications support a [`no_default_libraries`][1.5nd]
6696 setting that controls whether `-nodefaultlibs` is passed to the
6697 linker, and in turn the `is_like_windows` setting no longer affects
6698 the `-nodefaultlibs` flag.
6699 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6700 * The `#[inline]` and `#[repr]` attributes [can only appear
6701 in valid locations][1.5at].
6702 * Native libraries linked from the local crate are [passed to
6703 the linker before native libraries from upstream crates][1.5nl].
6704 * Two rarely-used attributes, `#[no_debug]` and
6705 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6706 * Negation of unsigned integers, which has been a warning for
6707 several releases, [is now behind a feature gate and will
6708 generate errors][1.5nu].
6709 * The parser accidentally accepted visibility modifiers on
6710 enum variants, a bug [which has been fixed][1.5ev].
6711 * [A bug was fixed that allowed `use` statements to import unstable
6717 * When evaluating expressions at compile-time that are not
6718 compile-time constants (const-evaluating expressions in non-const
6719 contexts), incorrect code such as overlong bitshifts and arithmetic
6720 overflow will [generate a warning instead of an error][1.5ce],
6721 delaying the error until runtime. This will allow the
6722 const-evaluator to be expanded in the future backwards-compatibly.
6723 * The `improper_ctypes` lint [no longer warns about using `isize` and
6724 `usize` in FFI][1.5ict].
6729 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6731 * `Default` is [implemented for mutable slices][1.5d].
6732 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6733 * There are now `From` conversions [between floating point
6734 types][1.5f] where the conversions are lossless.
6735 * There are now `From` conversions [between integer types][1.5i] where
6736 the conversions are lossless.
6737 * [`fs::Metadata` implements `Clone`][1.5fs].
6738 * The `parse` method [accepts a leading "+" when parsing
6740 * [`AsMut` is implemented for `Vec`][1.5am].
6741 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6742 been optimized][1.5cf] and no longer rely on the default impl.
6743 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6744 `unsafe extern "C"` function types now [implement `Clone`,
6745 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6746 `fmt::Debug` for up to 12 arguments][1.5fp].
6747 * [Dropping `Vec`s is much faster in unoptimized builds when the
6748 element types don't implement `Drop`][1.5dv].
6749 * A bug that caused in incorrect behavior when [combining `VecDeque`
6750 with zero-sized types][1.5vdz] was resolved.
6751 * [`PartialOrd` for slices is faster][1.5po].
6756 * [Crate metadata size was reduced by 20%][1.5md].
6757 * [Improvements to code generation reduced the size of libcore by 3.3
6758 MB and rustc's memory usage by 18MB][1.5m].
6759 * [Improvements to deref translation increased performance in
6760 unoptimized builds][1.5dr].
6761 * Various errors in trait resolution [are deduplicated to only be
6762 reported once][1.5te].
6763 * Rust has preliminary [support for rumprun kernels][1.5rr].
6764 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6766 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6767 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6768 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6769 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6770 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6771 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6772 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6773 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6774 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6775 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6776 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6777 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6778 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6779 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6780 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6781 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6782 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6783 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6784 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6785 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6786 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6787 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6788 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6789 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6790 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6791 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6792 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6793 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6794 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6795 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6796 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6797 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6798 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6799 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6800 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6801 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6802 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6803 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6804 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6805 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6806 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6807 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6808 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6809 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6810 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6811 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6812 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6813 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6814 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6815 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6816 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6817 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6818 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6819 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6820 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6821 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6822 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6823 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6824 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6825 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6826 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6827 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6828 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6829 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6830 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6831 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6832 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6833 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6834 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6835 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6836 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6837 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6838 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6839 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6840 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6841 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6842 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6843 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6844 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6845 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6846 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6847 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6848 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6849 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6850 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6851 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6852 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6853 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6854 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6856 Version 1.4.0 (2015-10-29)
6857 ==========================
6859 * ~1200 changes, numerous bugfixes
6864 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6865 GNU) are now supported and recommended for use.
6870 * [Several changes have been made to fix type soundness and improve
6871 the behavior of associated types][sound]. See [RFC 1214]. Although
6872 we have mostly introduced these changes as warnings this release, to
6873 become errors next release, there are still some scenarios that will
6874 see immediate breakage.
6875 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6876 line breaks in addition to `\n`][crlf].
6877 * [Loans of `'static` lifetime extend to the end of a function][stat].
6878 * [`str::parse` no longer introduces avoidable rounding error when
6879 parsing floating point numbers. Together with earlier changes to
6880 float formatting/output, "round trips" like f.to_string().parse()
6881 now preserve the value of f exactly. Additionally, leading plus
6882 signs are now accepted][fp3].
6888 * `use` statements that import multiple items [can now rename
6889 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6890 * [Binops work correctly on fat pointers][binfat].
6891 * `pub extern crate`, which does not behave as expected, [issues a
6892 warning][pec] until a better solution is found.
6897 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6898 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6899 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6900 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6901 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6902 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6903 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6904 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6905 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6906 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6907 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6908 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6909 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6910 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6911 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6912 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6913 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6914 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6916 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6917 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6918 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6919 `f64::from_str_radix`.
6920 * [Reverse-searching strings is faster with the 'two-way'
6922 * [`std::io::copy` allows `?Sized` arguments][cc].
6923 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6924 [override `count`, `nth` and `last` with an O(1)
6925 implementation][it].
6926 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6927 * [`IntoRawFd` has been added to the Unix-specific prelude,
6928 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6930 * [`Extend<String>` and `FromIterator<String` are both implemented for
6932 * [`IntoIterator` is implemented for references to `Option` and
6934 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6935 Copy`][ext] as part of [RFC 839]. This will cause type inference
6936 breakage in rare situations.
6937 * [`BinaryHeap` implements `Debug`][bh2].
6938 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6940 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6941 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6942 * [String comparison is faster][faststr].
6943 * `&mut T` where `T: std::fmt::Write` [also implements
6944 `std::fmt::Write`][mutw].
6945 * [A stable regression in `VecDeque::push_back` and other
6946 capacity-altering methods that caused panics for zero-sized types
6948 * [Function pointers implement traits for up to 12 parameters][fp2].
6953 * The compiler [no longer uses the 'morestack' feature to prevent
6954 stack overflow][mm]. Instead it uses guard pages and stack
6955 probes (though stack probes are not yet implemented on any platform
6957 * [The compiler matches traits faster when projections are involved][p].
6958 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6960 * [Cargo now displays useful information about what its doing during
6961 `cargo update`][cu].
6963 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6964 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6965 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6966 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6967 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6968 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6969 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6970 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6971 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6972 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6973 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6974 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6975 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6976 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6977 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6978 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6979 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6980 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6981 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6982 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6983 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6984 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6985 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6986 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6987 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6988 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6989 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6990 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6991 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6992 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6993 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6994 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6995 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6996 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6997 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6998 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6999 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7000 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7001 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7002 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7003 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7004 [bh2]: https://github.com/rust-lang/rust/pull/28156
7005 [binfat]: https://github.com/rust-lang/rust/pull/28270
7006 [bm]: https://github.com/rust-lang/rust/pull/28197
7007 [cc]: https://github.com/rust-lang/rust/pull/27531
7008 [crlf]: https://github.com/rust-lang/rust/pull/28034
7009 [cu]: https://github.com/rust-lang/cargo/pull/1931
7010 [d]: https://github.com/rust-lang/rust/pull/27825
7011 [dep]: https://github.com/rust-lang/rust/pull/28339
7012 [es]: https://github.com/rust-lang/rust/pull/27956
7013 [ext]: https://github.com/rust-lang/rust/pull/28094
7014 [faststr]: https://github.com/rust-lang/rust/pull/28338
7015 [ffi]: https://github.com/rust-lang/rust/pull/28779
7016 [fp]: https://github.com/rust-lang/rust/pull/28268
7017 [fp2]: https://github.com/rust-lang/rust/pull/28560
7018 [fp3]: https://github.com/rust-lang/rust/pull/27307
7019 [i]: https://github.com/rust-lang/rust/pull/27451
7020 [into2]: https://github.com/rust-lang/rust/pull/28039
7021 [it]: https://github.com/rust-lang/rust/pull/27652
7022 [mm]: https://github.com/rust-lang/rust/pull/27338
7023 [mutw]: https://github.com/rust-lang/rust/pull/28368
7024 [sound]: https://github.com/rust-lang/rust/pull/27641
7025 [p]: https://github.com/rust-lang/rust/pull/27866
7026 [pec]: https://github.com/rust-lang/rust/pull/28486
7027 [pr]: https://github.com/rust-lang/rust/pull/27896
7028 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7029 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7030 [s]: https://github.com/rust-lang/rust/pull/27474
7031 [stab]: https://github.com/rust-lang/rust/pull/28339
7032 [stat]: https://github.com/rust-lang/rust/pull/28321
7033 [vd]: https://github.com/rust-lang/rust/pull/28494
7035 Version 1.3.0 (2015-09-17)
7036 ==============================
7038 * ~900 changes, numerous bugfixes
7043 * The [new object lifetime defaults][nold] have been [turned
7044 on][nold2] after a cycle of warnings about the change. Now types
7045 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7046 being interpreted as `&'a Box<Trait+'a>` to `&'a
7047 Box<Trait+'static>`.
7048 * [The Rustonomicon][nom] is a new book in the official documentation
7049 that dives into writing unsafe Rust.
7050 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7051 timekeeping is employed by other std APIs, as well as out-of-tree
7057 * The [new object lifetime defaults][nold] have been [turned
7058 on][nold2] after a cycle of warnings about the change.
7059 * There is a known [regression][lr] in how object lifetime elision is
7060 interpreted, the proper solution for which is undetermined.
7061 * The `#[prelude_import]` attribute, an internal implementation
7062 detail, was accidentally stabilized previously. [It has been put
7063 behind the `prelude_import` feature gate][pi]. This change is
7064 believed to break no existing code.
7065 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7066 [more sane for dynamically sized types][dst3]. Code that relied on
7067 the previous behavior is thought to be broken.
7068 * The `dropck` rules, which checks that destructors can't access
7069 destroyed values, [have been updated][dropck] to match the
7070 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7071 cause some previously-compiling code to no longer build.
7076 * The [new object lifetime defaults][nold] have been [turned
7077 on][nold2] after a cycle of warnings about the change.
7078 * Semicolons may [now follow types and paths in
7079 macros](https://github.com/rust-lang/rust/pull/27000).
7080 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7081 [more sane for dynamically sized types][dst3]. Code that relied on
7082 the previous behavior is not known to exist, and suspected to be
7084 * `'static` variables [may now be recursive][st].
7085 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7086 implementations correctly.
7087 * The `dropck` rules, which checks that destructors can't access
7088 destroyed values, [have been updated][dropck] to match the
7094 * The [`Duration`] API, [has been stabilized][ds], as well as the
7095 `std::time` module, which presently contains only `Duration`.
7096 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7097 * The owned C string, [`CString`], implements [`Borrow`] and the
7098 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7099 these allow C strings to be borrowed and cloned in generic code.
7100 * [`CStr`] implements [`Debug`].
7101 * [`AtomicPtr`] implements [`Debug`].
7102 * [`Error`] trait objects [can be downcast to their concrete types][e]
7103 in many common configurations, using the [`is`], [`downcast`],
7104 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7106 * Searching for substrings now [employs the two-way algorithm][search]
7107 instead of doing a naive search. This gives major speedups to a
7108 number of methods, including [`contains`][sc], [`find`][sf],
7109 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7110 [`ends_with`][sew] are also faster.
7111 * The performance of `PartialEq` for slices is [much faster][ps].
7112 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7113 is overridden and optimized by the implementations for scalars.
7114 * The [`Hasher`] trait now has a number of specialized `write_*`
7115 methods for primitive types, for efficiency.
7116 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7117 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7118 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7119 of [`std::error::Error::cause`][iec] also delegates to the inner
7121 * [`process::Child`][pc] gained the [`id`] method, which returns a
7122 `u32` representing the platform-specific process identifier.
7123 * The [`connect`] method on slices is deprecated, replaced by the new
7124 [`join`] method (note that both of these are on the *unstable*
7125 [`SliceConcatExt`] trait, but through the magic of the prelude are
7126 available to stable code anyway).
7127 * The [`Div`] operator is implemented for [`Wrapping`] types.
7128 * [`DerefMut` is implemented for `String`][dms].
7129 * Performance of SipHash (the default hasher for `HashMap`) is
7130 [better for long data][sh].
7131 * [`AtomicPtr`] implements [`Send`].
7132 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7133 are now [specialized to use uninitialized buffers for increased
7135 * Lifetime parameters of foreign functions [are now resolved
7141 * Rust can now, with some coercion, [produce programs that run on
7142 Windows XP][xp], though XP is not considered a supported platform.
7143 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7144 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7145 recommended for use in 1.3, though should be fully-functional
7146 in the [64-bit 1.4 beta][b14].
7147 * On Fedora-based systems installation will [properly configure the
7148 dynamic linker][fl].
7149 * The compiler gained many new extended error descriptions, which can
7150 be accessed with the `--explain` flag.
7151 * The `dropck` pass, which checks that destructors can't access
7152 destroyed values, [has been rewritten][dropck]. This fixes some
7153 soundness holes, and as such will cause some previously-compiling
7154 code to no longer build.
7155 * `rustc` now uses [LLVM to write archive files where possible][ar].
7156 Eventually this will eliminate the compiler's dependency on the ar
7158 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7159 supported FreeBSD on x86_64).
7160 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7161 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7163 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7164 will kill the process instead of leaking][nlp].
7166 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7167 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7168 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7169 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7170 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7171 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7172 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7173 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7174 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7175 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7176 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7177 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7178 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7179 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7180 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7181 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7182 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7183 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7184 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7185 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7186 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7187 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7188 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7189 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7190 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7191 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7192 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7193 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7194 [ar]: https://github.com/rust-lang/rust/pull/26926
7195 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7196 [dms]: https://github.com/rust-lang/rust/pull/26241
7197 [dropck]: https://github.com/rust-lang/rust/pull/27261
7198 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7199 [ds]: https://github.com/rust-lang/rust/pull/26818
7200 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7201 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7202 [dst3]: https://github.com/rust-lang/rust/pull/27351
7203 [e]: https://github.com/rust-lang/rust/pull/24793
7204 [f]: https://github.com/rust-lang/rust/pull/26588
7205 [fb]: https://github.com/rust-lang/rust/pull/26959
7206 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7207 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7208 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7209 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7210 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7211 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7212 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7213 [lic]: https://github.com/rust-lang/rust/pull/26583
7214 [lnu]: https://github.com/rust-lang/rust/pull/27026
7215 [lr]: https://github.com/rust-lang/rust/issues/27248
7216 [lum]: https://github.com/rust-lang/rust/pull/26378
7217 [lur]: https://github.com/rust-lang/rust/pull/26783
7218 [nlp]: https://github.com/rust-lang/rust/pull/27176
7219 [nold2]: https://github.com/rust-lang/rust/pull/27045
7220 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7221 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7222 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7223 [pi]: https://github.com/rust-lang/rust/pull/26699
7224 [ps]: https://github.com/rust-lang/rust/pull/26884
7225 [rte]: https://github.com/rust-lang/rust/pull/26950
7226 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7227 [search]: https://github.com/rust-lang/rust/pull/26327
7228 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7229 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7230 [sh]: https://github.com/rust-lang/rust/pull/27280
7231 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7232 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7233 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7234 [st]: https://github.com/rust-lang/rust/pull/26630
7235 [win1]: https://github.com/rust-lang/rust/pull/26569
7236 [win2]: https://github.com/rust-lang/rust/pull/26741
7237 [win3]: https://github.com/rust-lang/rust/pull/26741
7238 [win4]: https://github.com/rust-lang/rust/pull/27210
7239 [xp]: https://github.com/rust-lang/rust/pull/26569
7241 Version 1.2.0 (2015-08-07)
7242 ==========================
7244 * ~1200 changes, numerous bugfixes
7249 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7250 like `Rc` to contain types without a fixed size, arrays and trait
7251 objects, finally enabling use of `Rc<[T]>` and completing the
7252 implementation of DST.
7253 * [Parallel codegen][parcodegen] is now working again, which can
7254 substantially speed up large builds in debug mode; It also gets
7255 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7256 jobs). It's not enabled by default, but will be "in the near
7257 future". It can be activated with the `-C codegen-units=N` flag to
7259 * This is the first release with [experimental support for linking
7260 with the MSVC linker and lib C on Windows (instead of using the GNU
7261 variants via MinGW)][win]. It is yet recommended only for the most
7262 intrepid Rustaceans.
7263 * Benchmark compilations are showing a 30% improvement in
7264 bootstrapping over 1.1.
7269 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7270 unicode case mapping, which is a previously-planned change in
7271 behavior and considered a bugfix.
7272 * [`mem::align_of`] now specifies [the *minimum alignment* for
7273 T][align], which is usually the alignment programs are interested
7274 in, and the same value reported by clang's
7275 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7277 * [The `#[packed]` attribute is no longer silently accepted by the
7278 compiler][packed]. This attribute did nothing and code that
7279 mentioned it likely did not work as intended.
7280 * Associated type defaults are [now behind the
7281 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7282 defaults *did not work*, but could be mentioned syntactically. As
7283 such this breakage has minimal impact.
7288 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7289 matching against dereferenceable values.
7294 * The [`Extend`] trait, which grows a collection from an iterator, is
7295 implemented over iterators of references, for `String`, `Vec`,
7296 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7297 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7298 * The [`iter::once`] function returns an iterator that yields a single
7299 element, and [`iter::empty`] returns an iterator that yields no
7301 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7302 over substring matches.
7303 * [`Cell`] and [`RefCell`] both implement `Eq`.
7304 * A number of methods for wrapping arithmetic are added to the
7305 integral types, [`wrapping_div`], [`wrapping_rem`],
7306 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7307 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7308 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7309 type.. It is illegal for the default arithmetic operations in Rust
7310 to overflow; the desire to wrap must be explicit.
7311 * The `{:#?}` formatting specifier [displays the alternate,
7312 pretty-printed][debugfmt] form of the `Debug` formatter. This
7313 feature was actually introduced prior to 1.0 with little
7315 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7316 for writing data to formatted strings, similar to [`io::Write`].
7317 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7318 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7319 are used by code generators to emit implementations of [`Debug`].
7320 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7321 methods that convert case, following Unicode case mapping.
7322 * It is now easier to handle poisoned locks. The [`PoisonError`]
7323 type, returned by failing lock operations, exposes `into_inner`,
7324 `get_ref`, and `get_mut`, which all give access to the inner lock
7325 guard, and allow the poisoned lock to continue to operate. The
7326 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7327 poisoned lock without attempting to take the lock.
7328 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7329 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7330 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7331 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7333 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7339 * `rustc` employs smarter heuristics for guessing at [typos].
7340 * `rustc` emits more efficient code for [no-op conversions between
7341 unsafe pointers][nop].
7342 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7343 resulting in faster compile times and smaller code.
7345 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7346 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7347 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7348 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7349 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7350 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7351 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7352 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7353 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7354 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7355 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7356 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7357 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7358 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7359 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7360 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7361 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7362 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7363 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7364 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7365 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7366 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7367 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7368 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7369 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7370 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7371 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7372 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7373 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7374 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7375 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7376 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7377 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7378 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7379 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7380 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7381 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7382 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7383 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7384 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7385 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7386 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7387 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7388 [align]: https://github.com/rust-lang/rust/pull/25646
7389 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7390 [typos]: https://github.com/rust-lang/rust/pull/26087
7391 [nop]: https://github.com/rust-lang/rust/pull/26336
7392 [fat]: https://github.com/rust-lang/rust/pull/26411
7393 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7394 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7395 [packed]: https://github.com/rust-lang/rust/pull/25541
7396 [ad]: https://github.com/rust-lang/rust/pull/27382
7397 [win]: https://github.com/rust-lang/rust/pull/25350
7399 Version 1.1.0 (2015-06-25)
7400 =========================
7402 * ~850 changes, numerous bugfixes
7407 * The [`std::fs` module has been expanded][fs] to expand the set of
7408 functionality exposed:
7409 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7410 don't incur a syscall on some platforms.
7411 * A `symlink_metadata` function has been added.
7412 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7413 access to all underlying information.
7414 * The compiler now contains extended explanations of many errors. When an error
7415 with an explanation occurs the compiler suggests using the `--explain` flag
7416 to read the explanation. Error explanations are also [available online][err-index].
7417 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7418 well as other work, the time to bootstrap the compiler decreased by
7424 * The [`str::split_whitespace`] method splits a string on unicode
7425 whitespace boundaries.
7426 * On both Windows and Unix, new extension traits provide conversion of
7427 I/O types to and from the underlying system handles. On Unix, these
7428 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7429 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7430 `TcpListener`, and `UpdSocket`. Further implementations for
7431 `std::process` will be stabilized later.
7432 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7433 Windows, symlinks can be created with
7434 `std::os::windows::symlink_dir` and
7435 `std::os::windows::symlink_file`.
7436 * The `mpsc::Receiver` type can now be converted into an iterator with
7437 `into_iter` on the [`IntoIterator`] trait.
7438 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7439 implementation of the [`From`] trait.
7440 * The `Debug` implementation for `RangeFull` [creates output that is
7441 more consistent with other implementations][rf].
7442 * [`Debug` is implemented for `File`][file].
7443 * The `Default` implementation for `Arc` [no longer requires `Sync +
7445 * [The `Iterator` methods `count`, `nth`, and `last` have been
7446 overridden for slices to have O(1) performance instead of O(n)][si].
7447 * Incorrect handling of paths on Windows has been improved in both the
7448 compiler and the standard library.
7449 * [`AtomicPtr` gained a `Default` implementation][ap].
7450 * In accordance with Rust's policy on arithmetic overflow `abs` now
7451 [panics on overflow when debug assertions are enabled][abs].
7452 * The [`Cloned`] iterator, which was accidentally left unstable for
7453 1.0 [has been stabilized][c].
7454 * The [`Incoming`] iterator, which iterates over incoming TCP
7455 connections, and which was accidentally unnamable in 1.0, [is now
7456 properly exported][inc].
7457 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7458 `sift_up` or `sift_down` panic][bh].
7459 * The [`split_off`] method of `LinkedList` [no longer corrupts
7460 the list in certain scenarios][ll].
7465 * Type checking performance [has improved notably][sk] with
7466 [multiple improvements][pre].
7467 * The compiler [suggests code changes][ch] for more errors.
7468 * rustc and it's build system have experimental support for [building
7469 toolchains against MUSL][m] instead of glibc on Linux.
7470 * The compiler defines the `target_env` cfg value, which is used for
7471 distinguishing toolchains that are otherwise for the same
7472 platform. Presently this is set to `gnu` for common GNU Linux
7473 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7474 * The [`cargo rustc`][crc] command invokes a build with custom flags
7476 * [Android executables are always position independent][pie].
7477 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7480 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7481 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7482 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7483 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7484 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7485 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7486 [rf]: https://github.com/rust-lang/rust/pull/24491
7487 [err-index]: https://doc.rust-lang.org/error-index.html
7488 [sk]: https://github.com/rust-lang/rust/pull/24615
7489 [pre]: https://github.com/rust-lang/rust/pull/25323
7490 [file]: https://github.com/rust-lang/rust/pull/24598
7491 [ch]: https://github.com/rust-lang/rust/pull/24683
7492 [arc]: https://github.com/rust-lang/rust/pull/24695
7493 [si]: https://github.com/rust-lang/rust/pull/24701
7494 [ap]: https://github.com/rust-lang/rust/pull/24834
7495 [m]: https://github.com/rust-lang/rust/pull/24777
7496 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7497 [crc]: https://github.com/rust-lang/cargo/pull/1568
7498 [pie]: https://github.com/rust-lang/rust/pull/24953
7499 [abs]: https://github.com/rust-lang/rust/pull/25441
7500 [c]: https://github.com/rust-lang/rust/pull/25496
7501 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7502 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7503 [inc]: https://github.com/rust-lang/rust/pull/25522
7504 [bh]: https://github.com/rust-lang/rust/pull/25856
7505 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7506 [ll]: https://github.com/rust-lang/rust/pull/26022
7507 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7508 [drop]: https://github.com/rust-lang/rust/pull/24935
7510 Version 1.0.0 (2015-05-15)
7511 ========================
7513 * ~1500 changes, numerous bugfixes
7518 * The vast majority of the standard library is now `#[stable]`. It is
7519 no longer possible to use unstable features with a stable build of
7521 * Many popular crates on [crates.io] now work on the stable release
7523 * Arithmetic on basic integer types now [checks for overflow in debug
7529 * Several [restrictions have been added to trait coherence][coh] in
7530 order to make it easier for upstream authors to change traits
7531 without breaking downstream code.
7532 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7533 improve error messages and macro behavior. For example, `0b1234` is
7534 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7535 * Trait bounds [are always invariant][inv], eliminating the need for
7536 the `PhantomFn` and `MarkerTrait` lang items, which have been
7538 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7539 "foo" as bar` syntax has been replaced with `extern crate foo as
7540 bar`, and Cargo now automatically translates "-" in *package* names
7541 to underscore for the crate name.
7542 * [Lifetime shadowing is an error][lt].
7543 * [`Send` no longer implies `'static`][send-rfc].
7544 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7545 `MyType::default()`.
7546 * Primitive types [now have inherent methods][prim-inherent],
7547 obviating the need for extension traits like `SliceExt`.
7548 * Methods with `Self: Sized` in their `where` clause are [considered
7549 object-safe][self-sized], allowing many extension traits like
7550 `IteratorExt` to be merged into the traits they extended.
7551 * You can now [refer to associated types][assoc-where] whose
7552 corresponding trait bounds appear only in a `where` clause.
7553 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7554 like `Send` and `Sync` are now library-defined.
7555 * A [Reflect trait][reflect] was introduced, which means that
7556 downcasting via the `Any` trait is effectively limited to concrete
7557 types. This helps retain the potentially-important "parametricity"
7558 property: generic code cannot behave differently for different type
7559 arguments except in minor ways.
7560 * The `unsafe_destructor` feature is now deprecated in favor of the
7561 [new `dropck`][dropck]. This change is a major reduction in unsafe
7567 * The `thread_local` module [has been renamed to `std::thread`][th].
7568 * The methods of `IteratorExt` [have been moved to the `Iterator`
7570 * Several traits that implement Rust's conventions for type
7571 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7572 [centralized in the `std::convert` module][con].
7573 * The `FromError` trait [was removed in favor of `From`][fe].
7574 * The basic sleep function [has moved to
7575 `std::thread::sleep_ms`][slp].
7576 * The `splitn` function now takes an `n` parameter that represents the
7577 number of items yielded by the returned iterator [instead of the
7578 number of 'splits'][spl].
7579 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7580 * [Derived implementations of `PartialOrd` now order enums according
7581 to their explicitly-assigned discriminants][po].
7582 * [Methods for searching strings are generic over `Pattern`s][pat],
7583 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7585 * [In method resolution, object methods are resolved before inherent
7587 * [`String::from_str` has been deprecated in favor of the `From` impl,
7588 `String::from`][sf].
7589 * [`io::Error` implements `Sync`][ios].
7590 * [The `words` method on `&str` has been replaced with
7591 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7593 * The new path and IO modules are complete and `#[stable]`. This
7594 was the major library focus for this cycle.
7595 * The path API was [revised][path-normalize] to normalize `.`,
7596 adjusting the tradeoffs in favor of the most common usage.
7597 * A large number of remaining APIs in `std` were also stabilized
7598 during this cycle; about 75% of the non-deprecated API surface
7600 * The new [string pattern API][string-pattern] landed, which makes
7601 the string slice API much more internally consistent and flexible.
7602 * A new set of [generic conversion traits][conversion] replaced
7603 many existing ad hoc traits.
7604 * Generic numeric traits were [completely removed][num-traits]. This
7605 was made possible thanks to inherent methods for primitive types,
7606 and the removal gives maximal flexibility for designing a numeric
7607 hierarchy in the future.
7608 * The `Fn` traits are now related via [inheritance][fn-inherit]
7609 and provide ergonomic [blanket implementations][fn-blanket].
7610 * The `Index` and `IndexMut` traits were changed to
7611 [take the index by value][index-value], enabling code like
7612 `hash_map["string"]` to work.
7613 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7614 `Copy` data is known to be `Clone` as well.
7619 * Many errors now have extended explanations that can be accessed with
7620 the `--explain` flag to `rustc`.
7621 * Many new examples have been added to the standard library
7623 * rustdoc has received a number of improvements focused on completion
7625 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7626 * Much headway was made on ecosystem-wide CI, making it possible
7627 to [compare builds for breakage][ci-compare].
7630 [crates.io]: http://crates.io
7631 [clo]: https://github.com/rust-lang/rust/pull/24034
7632 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7633 [con]: https://github.com/rust-lang/rust/pull/23875
7634 [cr]: https://github.com/rust-lang/rust/pull/23419
7635 [fe]: https://github.com/rust-lang/rust/pull/23879
7636 [ie]: https://github.com/rust-lang/rust/pull/23300
7637 [inv]: https://github.com/rust-lang/rust/pull/23938
7638 [ios]: https://github.com/rust-lang/rust/pull/24133
7639 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7640 [lt]: https://github.com/rust-lang/rust/pull/24057
7641 [meth]: https://github.com/rust-lang/rust/pull/24056
7642 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7643 [po]: https://github.com/rust-lang/rust/pull/24270
7644 [sf]: https://github.com/rust-lang/rust/pull/24517
7645 [slp]: https://github.com/rust-lang/rust/pull/23949
7646 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7647 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7648 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7649 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7650 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7651 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7652 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7653 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7654 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7655 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7656 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7657 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7658 [reflect]: https://github.com/rust-lang/rust/pull/23712
7659 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7660 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7661 [index-value]: https://github.com/rust-lang/rust/pull/23601
7662 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7663 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7664 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7665 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7666 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7667 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7670 Version 1.0.0-alpha.2 (2015-02-20)
7671 =====================================
7673 * ~1300 changes, numerous bugfixes
7677 * The various I/O modules were [overhauled][io-rfc] to reduce
7678 unnecessary abstractions and provide better interoperation with
7679 the underlying platform. The old `io` module remains temporarily
7681 * The standard library now [participates in feature gating][feat],
7682 so use of unstable libraries now requires a `#![feature(...)]`
7683 attribute. The impact of this change is [described on the
7684 forum][feat-forum]. [RFC][feat-rfc].
7688 * `for` loops [now operate on the `IntoIterator` trait][into],
7689 which eliminates the need to call `.iter()`, etc. to iterate
7690 over collections. There are some new subtleties to remember
7691 though regarding what sort of iterators various types yield, in
7692 particular that `for foo in bar { }` yields values from a move
7693 iterator, destroying the original collection. [RFC][into-rfc].
7694 * Objects now have [default lifetime bounds][obj], so you don't
7695 have to write `Box<Trait+'static>` when you don't care about
7696 storing references. [RFC][obj-rfc].
7697 * In types that implement `Drop`, [lifetimes must outlive the
7698 value][drop]. This will soon make it possible to safely
7699 implement `Drop` for types where `#[unsafe_destructor]` is now
7700 required. Read the [gorgeous RFC][drop-rfc] for details.
7701 * The fully qualified <T as Trait>::X syntax lets you set the Self
7702 type for a trait method or associated type. [RFC][ufcs-rfc].
7703 * References to types that implement `Deref<U>` now [automatically
7704 coerce to references][deref] to the dereferenced type `U`,
7705 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7706 should eliminate many unsightly uses of `&*`, as when converting
7707 from references to vectors into references to
7708 slices. [RFC][deref-rfc].
7709 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7710 `|:|`) is obsolete and closure kind is inferred from context.
7711 * [`Self` is a keyword][Self].
7715 * The `Show` and `String` formatting traits [have been
7716 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7717 their related purposes. Automatically getting a string
7718 conversion to use with `format!("{:?}", something_to_debug)` is
7719 now written `#[derive(Debug)]`.
7720 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7721 OsStr}`, provide strings in platform-specific encodings for easier
7722 interop with system APIs. [RFC][osstr-rfc].
7723 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7724 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7725 creating raw pointers.
7729 * Certain long error messages of the form 'expected foo found bar'
7730 are now [split neatly across multiple
7731 lines][multiline]. Examples in the PR.
7732 * On Unix Rust can be [uninstalled][un] by running
7733 `/usr/local/lib/rustlib/uninstall.sh`.
7734 * The `#[rustc_on_unimplemented]` attribute, requiring the
7735 'on_unimplemented' feature, lets rustc [display custom error
7736 messages when a trait is expected to be implemented for a type
7741 * Rust is tested against a [LALR grammar][lalr], which parses
7742 almost all the Rust files that rustc does.
7744 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7745 [close]: https://github.com/rust-lang/rust/pull/21843
7746 [deref]: https://github.com/rust-lang/rust/pull/21351
7747 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7748 [drop]: https://github.com/rust-lang/rust/pull/21972
7749 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7750 [feat]: https://github.com/rust-lang/rust/pull/21248
7751 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7752 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7753 [fmt]: https://github.com/rust-lang/rust/pull/21457
7754 [into]: https://github.com/rust-lang/rust/pull/20790
7755 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7756 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7757 [lalr]: https://github.com/rust-lang/rust/pull/21452
7758 [multiline]: https://github.com/rust-lang/rust/pull/19870
7759 [obj]: https://github.com/rust-lang/rust/pull/22230
7760 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7761 [onun]: https://github.com/rust-lang/rust/pull/20889
7762 [osstr]: https://github.com/rust-lang/rust/pull/21488
7763 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7764 [Self]: https://github.com/rust-lang/rust/pull/22158
7765 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7766 [un]: https://github.com/rust-lang/rust/pull/22256
7769 Version 1.0.0-alpha (2015-01-09)
7770 ==================================
7772 * ~2400 changes, numerous bugfixes
7776 * The language itself is considered feature complete for 1.0,
7777 though there will be many usability improvements and bugfixes
7778 before the final release.
7779 * Nearly 50% of the public API surface of the standard library has
7780 been declared 'stable'. Those interfaces are unlikely to change
7782 * The long-running debate over integer types has been
7783 [settled][ints]: Rust will ship with types named `isize` and
7784 `usize`, rather than `int` and `uint`, for pointer-sized
7785 integers. Guidelines will be rolled out during the alpha cycle.
7786 * Most crates that are not `std` have been moved out of the Rust
7787 distribution into the Cargo ecosystem so they can evolve
7788 separately and don't need to be stabilized as quickly, including
7789 'time', 'getopts', 'num', 'regex', and 'term'.
7790 * Documentation continues to be expanded with more API coverage, more
7791 examples, and more in-depth explanations. The guides have been
7792 consolidated into [The Rust Programming Language][trpl].
7793 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7794 * All official Rust binary installers now come with [Cargo], the
7795 Rust package manager.
7799 * Closures have been [completely redesigned][unboxed] to be
7800 implemented in terms of traits, can now be used as generic type
7801 bounds and thus monomorphized and inlined, or via an opaque
7802 pointer (boxed) as in the old system. The new system is often
7803 referred to as 'unboxed' closures.
7804 * Traits now support [associated types][assoc], allowing families
7805 of related types to be defined together and used generically in
7807 * Enum variants are [namespaced by their type names][enum].
7808 * [`where` clauses][where] provide a more versatile and attractive
7809 syntax for specifying generic bounds, though the previous syntax
7811 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7813 * Rust [no longer has a runtime][rt] of any description, and only
7814 supports OS threads, not green threads.
7815 * At long last, Rust has been overhauled for 'dynamically-sized
7816 types' ([DST]), which integrates 'fat pointers' (object types,
7817 arrays, and `str`) more deeply into the type system, making it
7819 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7820 `..j` that produce range types and which, when combined with the
7821 `Index` operator and multidispatch, leads to a convenient slice
7823 * The new range syntax revealed an ambiguity in the fixed-length
7824 array syntax, so now fixed length arrays [are written `[T;
7826 * The `Copy` trait is no longer implemented automatically. Unsafe
7827 pointers no longer implement `Sync` and `Send` so types
7828 containing them don't automatically either. `Sync` and `Send`
7829 are now 'unsafe traits' so one can "forcibly" implement them via
7830 `unsafe impl` if a type confirms to the requirements for them
7831 even though the internals do not (e.g. structs containing unsafe
7832 pointers like `Arc`). These changes are intended to prevent some
7833 footguns and are collectively known as [opt-in built-in
7834 traits][oibit] (though `Sync` and `Send` will soon become pure
7835 library types unknown to the compiler).
7836 * Operator traits now take their operands [by value][ops], and
7837 comparison traits can use multidispatch to compare one type
7838 against multiple other types, allowing e.g. `String` to be
7839 compared with `&str`.
7840 * `if let` and `while let` are no longer feature-gated.
7841 * Rust has adopted a more [uniform syntax for escaping unicode
7842 characters][unicode].
7843 * `macro_rules!` [has been declared stable][mac]. Though it is a
7844 flawed system it is sufficiently popular that it must be usable
7845 for 1.0. Effort has gone into [future-proofing][mac-future] it
7846 in ways that will allow other macro systems to be developed in
7847 parallel, and won't otherwise impact the evolution of the
7849 * The prelude has been [pared back significantly][prelude] such
7850 that it is the minimum necessary to support the most pervasive
7851 code patterns, and through [generalized where clauses][where]
7852 many of the prelude extension traits have been consolidated.
7853 * Rust's rudimentary reflection [has been removed][refl], as it
7854 incurred too much code generation for little benefit.
7855 * [Struct variants][structvars] are no longer feature-gated.
7856 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7857 known as 'higher-ranked trait bounds', this crucially allows
7858 unboxed closures to work.
7859 * Macros invocations surrounded by parens or square brackets and
7860 not terminated by a semicolon are [parsed as
7861 expressions][macros], which makes expressions like `vec![1i32,
7862 2, 3].len()` work as expected.
7863 * Trait objects now implement their traits automatically, and
7864 traits that can be coerced to objects now must be [object
7866 * Automatically deriving traits is now done with `#[derive(...)]`
7867 not `#[deriving(...)]` for [consistency with other naming
7868 conventions][derive].
7869 * Importing the containing module or enum at the same time as
7870 items or variants they contain is [now done with `self` instead
7871 of `mod`][self], as in use `foo::{self, bar}`
7872 * Glob imports are no longer feature-gated.
7873 * The `box` operator and `box` patterns have been feature-gated
7874 pending a redesign. For now unique boxes should be allocated
7875 like other containers, with `Box::new`.
7879 * A [series][coll1] of [efforts][coll2] to establish
7880 [conventions][coll3] for collections types has resulted in API
7881 improvements throughout the standard library.
7882 * New [APIs for error handling][err] provide ergonomic interop
7883 between error types, and [new conventions][err-conv] describe
7884 more clearly the recommended error handling strategies in Rust.
7885 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7886 it is easier to discuss failure in the context of error handling
7887 without making clarifications as to whether you are referring to
7888 the 'fail' macro or failure more generally.
7889 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7890 syscall when available.
7891 * The 'serialize' crate has been renamed 'rustc-serialize' and
7892 moved out of the distribution to Cargo. Although it is widely
7893 used now, it is expected to be superseded in the near future.
7894 * The `Show` formatter, typically implemented with
7895 `#[derive(Show)]` is [now requested with the `{:?}`
7896 specifier][show] and is intended for use by all types, for uses
7897 such as `println!` debugging. The new `String` formatter must be
7898 implemented by hand, uses the `{}` specifier, and is intended
7899 for full-fidelity conversions of things that can logically be
7900 represented as strings.
7904 * [Flexible target specification][flex] allows rustc's code
7905 generation to be configured to support otherwise-unsupported
7907 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7908 respective debuggers with Rust-appropriate pretty-printing.
7909 * The Windows installation of Rust is distributed with the
7910 MinGW components currently required to link binaries on that
7915 * Nullable enum optimizations have been extended to more types so
7916 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7917 space than the inner types themselves.
7918 * Work has begun on supporting AArch64.
7920 [Cargo]: https://crates.io
7921 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7922 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7923 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7924 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7925 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7926 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7927 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7928 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7929 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7930 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7931 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7932 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7933 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7934 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7935 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7936 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7937 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7938 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7939 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7940 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7941 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7942 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7943 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7944 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7945 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7946 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7947 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7948 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7949 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7950 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7951 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7952 [trpl]: https://doc.rust-lang.org/book/index.html
7953 [rbe]: http://rustbyexample.com/
7956 Version 0.12.0 (2014-10-09)
7957 =============================
7959 * ~1900 changes, numerous bugfixes
7963 * The introductory documentation (now called The Rust Guide) has
7964 been completely rewritten, as have a number of supplementary
7966 * Rust's package manager, Cargo, continues to improve and is
7967 sometimes considered to be quite awesome.
7968 * Many API's in `std` have been reviewed and updated for
7969 consistency with the in-development Rust coding
7970 guidelines. The standard library documentation tracks
7971 stabilization progress.
7972 * Minor libraries have been moved out-of-tree to the rust-lang org
7973 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7974 be installed with Cargo.
7975 * Lifetime elision allows lifetime annotations to be left off of
7976 function declarations in many common scenarios.
7977 * Rust now works on 64-bit Windows.
7980 * Indexing can be overloaded with the `Index` and `IndexMut`
7982 * The `if let` construct takes a branch only if the `let` pattern
7983 matches, currently behind the 'if_let' feature gate.
7984 * 'where clauses', a more flexible syntax for specifying trait
7985 bounds that is more aesthetic, have been added for traits and
7986 free functions. Where clauses will in the future make it
7987 possible to constrain associated types, which would be
7988 impossible with the existing syntax.
7989 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7990 the 'slicing_syntax' feature gate, and can be overloaded with
7991 the `Slice` or `SliceMut` traits.
7992 * The syntax for matching of sub-slices has been changed to use a
7993 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7994 consistency with other uses of `..` and to future-proof
7995 potential additional uses of the syntax.
7996 * The syntax for matching inclusive ranges in patterns has changed
7997 from `0..3` to `0...4` to be consistent with the exclusive range
7999 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8000 c]`) has been put behind the 'advanced_slice_patterns' feature
8001 gate and may be removed in the future.
8002 * Components of tuples and tuple structs can be extracted using
8003 the `value.0` syntax, currently behind the `tuple_indexing`
8005 * The `#[crate_id]` attribute is no longer supported; versioning
8006 is handled by the package manager.
8007 * Renaming crate imports are now written `extern crate foo as bar`
8008 instead of `extern crate bar = foo`.
8009 * Renaming use statements are now written `use foo as bar` instead
8011 * `let` and `match` bindings and argument names in macros are now
8013 * The new, more efficient, closure types ('unboxed closures') have
8014 been added under a feature gate, 'unboxed_closures'. These will
8015 soon replace the existing closure types, once higher-ranked
8016 trait lifetimes are added to the language.
8017 * `move` has been added as a keyword, for indicating closures
8018 that capture by value.
8019 * Mutation and assignment is no longer allowed in pattern guards.
8020 * Generic structs and enums can now have trait bounds.
8021 * The `Share` trait is now called `Sync` to free up the term
8022 'shared' to refer to 'shared reference' (the default reference
8024 * Dynamically-sized types have been mostly implemented,
8025 unifying the behavior of fat-pointer types with the rest of the
8027 * As part of dynamically-sized types, the `Sized` trait has been
8028 introduced, which qualifying types implement by default, and
8029 which type parameters expect by default. To specify that a type
8030 parameter does not need to be sized, write `<Sized? T>`. Most
8031 types are `Sized`, notable exceptions being unsized arrays
8032 (`[T]`) and trait types.
8033 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8034 * Lifetime bounds can now be applied to type parameters and object
8036 * The old, reference counted GC type, `Gc<T>` which was once
8037 denoted by the `@` sigil, has finally been removed. GC will be
8038 revisited in the future.
8041 * Library documentation has been improved for a number of modules.
8042 * Bit-vectors, collections::bitv has been modernized.
8043 * The url crate is deprecated in favor of
8044 http://github.com/servo/rust-url, which can be installed with
8046 * Most I/O stream types can be cloned and subsequently closed from
8048 * A `std::time::Duration` type has been added for use in I/O
8049 methods that rely on timers, as well as in the 'time' crate's
8050 `Timespec` arithmetic.
8051 * The runtime I/O abstraction layer that enabled the green thread
8052 scheduler to do non-thread-blocking I/O has been removed, along
8053 with the libuv-based implementation employed by the green thread
8054 scheduler. This will greatly simplify the future I/O work.
8055 * `collections::btree` has been rewritten to have a more
8056 idiomatic and efficient design.
8059 * rustdoc output now indicates the stability levels of API's.
8060 * The `--crate-name` flag can specify the name of the crate
8061 being compiled, like `#[crate_name]`.
8062 * The `-C metadata` specifies additional metadata to hash into
8063 symbol names, and `-C extra-filename` specifies additional
8064 information to put into the output filename, for use by the
8065 package manager for versioning.
8066 * debug info generation has continued to improve and should be
8067 more reliable under both gdb and lldb.
8068 * rustc has experimental support for compiling in parallel
8069 using the `-C codegen-units` flag.
8070 * rustc no longer encodes rpath information into binaries by
8074 * Stack usage has been optimized with LLVM lifetime annotations.
8075 * Official Rust binaries on Linux are more compatible with older
8076 kernels and distributions, built on CentOS 5.10.
8079 Version 0.11.0 (2014-07-02)
8080 ==========================
8082 * ~1700 changes, numerous bugfixes
8085 * ~[T] has been removed from the language. This type is superseded by
8087 * ~str has been removed from the language. This type is superseded by
8089 * ~T has been removed from the language. This type is superseded by the
8091 * @T has been removed from the language. This type is superseded by the
8092 standard library's std::gc::Gc<T> type.
8093 * Struct fields are now all private by default.
8094 * Vector indices and shift amounts are both required to be a `uint`
8095 instead of any integral type.
8096 * Byte character, byte string, and raw byte string literals are now all
8097 supported by prefixing the normal literal with a `b`.
8098 * Multiple ABIs are no longer allowed in an ABI string
8099 * The syntax for lifetimes on closures/procedures has been tweaked
8100 slightly: `<'a>|A, B|: 'b + K -> T`
8101 * Floating point modulus has been removed from the language; however it
8102 is still provided by a library implementation.
8103 * Private enum variants are now disallowed.
8104 * The `priv` keyword has been removed from the language.
8105 * A closure can no longer be invoked through a &-pointer.
8106 * The `use foo, bar, baz;` syntax has been removed from the language.
8107 * The transmute intrinsic no longer works on type parameters.
8108 * Statics now allow blocks/items in their definition.
8109 * Trait bounds are separated from objects with + instead of : now.
8110 * Objects can no longer be read while they are mutably borrowed.
8111 * The address of a static is now marked as insignificant unless the
8112 #[inline(never)] attribute is placed it.
8113 * The #[unsafe_destructor] attribute is now behind a feature gate.
8114 * Struct literals are no longer allowed in ambiguous positions such as
8115 if, while, match, and for..in.
8116 * Declaration of lang items and intrinsics are now feature-gated by
8118 * Integral literals no longer default to `int`, and floating point
8119 literals no longer default to `f64`. Literals must be suffixed with an
8120 appropriate type if inference cannot determine the type of the
8122 * The Box<T> type is no longer implicitly borrowed to &mut T.
8123 * Procedures are now required to not capture borrowed references.
8126 * The standard library is now a "facade" over a number of underlying
8127 libraries. This means that development on the standard library should
8128 be speedier due to smaller crates, as well as a clearer line between
8130 * A new library, libcore, lives under the standard library's facade
8131 which is Rust's "0-assumption" library, suitable for embedded and
8132 kernel development for example.
8133 * A regex crate has been added to the standard distribution. This crate
8134 includes statically compiled regular expressions.
8135 * The unwrap/unwrap_err methods on Result require a Show bound for
8136 better error messages.
8137 * The return types of the std::comm primitives have been centralized
8138 around the Result type.
8139 * A number of I/O primitives have gained the ability to time out their
8141 * A number of I/O primitives have gained the ability to close their
8142 reading/writing halves to cancel pending operations.
8143 * Reverse iterator methods have been removed in favor of `rev()` on
8144 their forward-iteration counterparts.
8145 * A bitflags! macro has been added to enable easy interop with C and
8146 management of bit flags.
8147 * A debug_assert! macro is now provided which is disabled when
8148 `--cfg ndebug` is passed to the compiler.
8149 * A graphviz crate has been added for creating .dot files.
8150 * The std::cast module has been migrated into std::mem.
8151 * The std::local_data api has been migrated from freestanding functions
8152 to being based on methods.
8153 * The Pod trait has been renamed to Copy.
8154 * jemalloc has been added as the default allocator for types.
8155 * The API for allocating memory has been changed to use proper alignment
8156 and sized deallocation
8157 * Connecting a TcpStream or binding a TcpListener is now based on a
8158 string address and a u16 port. This allows connecting to a hostname as
8160 * The Reader trait now contains a core method, read_at_least(), which
8161 correctly handles many repeated 0-length reads.
8162 * The process-spawning API is now centered around a builder-style
8164 * The :? printing qualifier has been moved from the standard library to
8165 an external libdebug crate.
8166 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8167 have been renamed to Eq/Ord.
8168 * The select/plural methods have been removed from format!. The escapes
8169 for { and } have also changed from \{ and \} to {{ and }},
8171 * The TaskBuilder API has been re-worked to be a true builder, and
8172 extension traits for spawning native/green tasks have been added.
8175 * All breaking changes to the language or libraries now have their
8176 commit message annotated with `[breaking-change]` to allow for easy
8177 discovery of breaking changes.
8178 * The compiler will now try to suggest how to annotate lifetimes if a
8179 lifetime-related error occurs.
8180 * Debug info continues to be improved greatly with general bug fixes and
8181 better support for situations like link time optimization (LTO).
8182 * Usage of syntax extensions when cross-compiling has been fixed.
8183 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8184 -fdata-sections and --gc-sections has been enabled by default
8185 * The compiler is now stricter about where it will load module files
8186 from when a module is declared via `mod foo;`.
8187 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8188 Syntax extensions are now discovered via a "plugin registrar" type
8189 which will be extended in the future to other various plugins.
8190 * Lints have been restructured to allow for dynamically loadable lints.
8191 * A number of rustdoc improvements:
8192 * The HTML output has been visually redesigned.
8193 * Markdown is now powered by hoedown instead of sundown.
8194 * Searching heuristics have been greatly improved.
8195 * The search index has been reduced in size by a great amount.
8196 * Cross-crate documentation via `pub use` has been greatly improved.
8197 * Primitive types are now hyperlinked and documented.
8198 * Documentation has been moved from static.rust-lang.org/doc to
8200 * A new sandbox, play.rust-lang.org, is available for running and
8201 sharing rust code examples on-line.
8202 * Unused attributes are now more robustly warned about.
8203 * The dead_code lint now warns about unused struct fields.
8204 * Cross-compiling to iOS is now supported.
8205 * Cross-compiling to mipsel is now supported.
8206 * Stability attributes are now inherited by default and no longer apply
8207 to intra-crate usage, only inter-crate usage.
8208 * Error message related to non-exhaustive match expressions have been
8212 Version 0.10 (2014-04-03)
8213 =========================
8215 * ~1500 changes, numerous bugfixes
8218 * A new RFC process is now in place for modifying the language.
8219 * Patterns with `@`-pointers have been removed from the language.
8220 * Patterns with unique vectors (`~[T]`) have been removed from the
8222 * Patterns with unique strings (`~str`) have been removed from the
8224 * `@str` has been removed from the language.
8225 * `@[T]` has been removed from the language.
8226 * `@self` has been removed from the language.
8227 * `@Trait` has been removed from the language.
8228 * Headers on `~` allocations which contain `@` boxes inside the type for
8229 reference counting have been removed.
8230 * The semantics around the lifetimes of temporary expressions have changed,
8231 see #3511 and #11585 for more information.
8232 * Cross-crate syntax extensions are now possible, but feature gated. See
8233 #11151 for more information. This includes both `macro_rules!` macros as
8234 well as syntax extensions such as `format!`.
8235 * New lint modes have been added, and older ones have been turned on to be
8237 * Unnecessary parentheses
8240 * Uppercase variables
8241 * Publicly visible private types
8242 * `#[deriving]` with raw pointers
8243 * Unsafe functions can no longer be coerced to closures.
8244 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8245 * The `#[simd]` attribute is now behind a feature gate.
8246 * Visibility is no longer allowed on `extern crate` statements, and
8247 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8248 * Trailing commas are now allowed in argument lists and tuple patterns.
8249 * The `do` keyword has been removed, it is now a reserved keyword.
8250 * Default type parameters have been implemented, but are feature gated.
8251 * Borrowed variables through captures in closures are now considered soundly.
8252 * `extern mod` is now `extern crate`
8253 * The `Freeze` trait has been removed.
8254 * The `Share` trait has been added for types that can be shared among
8256 * Labels in macros are now hygienic.
8257 * Expression/statement macro invocations can be delimited with `{}` now.
8258 * Treatment of types allowed in `static mut` locations has been tweaked.
8259 * The `*` and `.` operators are now overloadable through the `Deref` and
8261 * `~Trait` and `proc` no longer have `Send` bounds by default.
8262 * Partial type hints are now supported with the `_` type marker.
8263 * An `Unsafe` type was introduced for interior mutability. It is now
8264 considered undefined to transmute from `&T` to `&mut T` without using the
8266 * The #[linkage] attribute was implemented for extern statics/functions.
8267 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8268 * `Pod` was renamed to `Copy`.
8271 * The `libextra` library has been removed. It has now been decomposed into
8272 component libraries with smaller and more focused nuggets of
8273 functionality. The full list of libraries can be found on the
8274 documentation index page.
8275 * std: `std::condition` has been removed. All I/O errors are now propagated
8276 through the `Result` type. In order to assist with error handling, a
8277 `try!` macro for unwrapping errors with an early return and a lint for
8278 unused results has been added. See #12039 for more information.
8279 * std: The `vec` module has been renamed to `slice`.
8280 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8281 This will become the only growable vector in the future.
8282 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8283 are now found at `std::io::BufferedReader` instead of
8284 `std::io::buffered::BufferedReader`.
8285 * std: `print` and `println` are no longer in the prelude, the `print!` and
8286 `println!` macros are intended to be used instead.
8287 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8288 attempts to statically prevent cycles.
8289 * std: The standard distribution is adopting the policy of pushing failure
8290 to the user rather than failing in libraries. Many functions (such as
8291 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8292 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8293 deriving mode: `#[deriving(Show)]`.
8294 * std: `ToStr` is now implemented for all types implementing `Show`.
8295 * std: The formatting trait methods now take `&self` instead of `&T`
8296 * std: The `invert()` method on iterators has been renamed to `rev()`
8297 * std: `std::num` has seen a reduction in the genericity of its traits,
8298 consolidating functionality into a few core traits.
8299 * std: Backtraces are now printed on task failure if the environment
8300 variable `RUST_BACKTRACE` is present.
8301 * std: Naming conventions for iterators have been standardized. More details
8302 can be found on the wiki's style guide.
8303 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8304 still implement the function.
8305 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8306 * std: `assert_approx_eq!` has been removed
8307 * std: The `e` and `E` formatting specifiers for floats have been added to
8308 print them in exponential notation.
8309 * std: The `Times` trait has been removed
8310 * std: Indications of variance and opting out of builtin bounds is done
8311 through marker types in `std::kinds::marker` now
8312 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8313 `#[deriving(Hash)]` is now possible.
8314 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8315 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8316 * std: `Chan::new` is now `channel()`.
8317 * std: A new synchronous channel type has been implemented.
8318 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8319 * std: `hashmap` and `trie` have been moved to `libcollections`
8320 * std: `run` has been rolled into `io::process`
8321 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8322 * std: The equality and comparison traits have seen some reorganization.
8323 * std: `rand` has moved to `librand`.
8324 * std: `to_{lower,upper}case` has been implemented for `char`.
8325 * std: Logging has been moved to `liblog`.
8326 * collections: `HashMap` has been rewritten for higher performance and less
8328 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8329 it can be booted manually. The runtime guide has more information and
8331 * native: All I/O functionality except signals has been implemented.
8332 * green: Task spawning with `libgreen` has been optimized with stack caching
8333 and various trimming of code.
8334 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8335 * sync: The `extra::sync` module has been updated to modern rust (and moved
8336 to the `sync` library), tweaking and improving various interfaces while
8337 dropping redundant functionality.
8338 * sync: A new `Barrier` type has been added to the `sync` library.
8339 * sync: An efficient mutex for native and green tasks has been implemented.
8340 * serialize: The `base64` module has seen some improvement. It treats
8341 newlines better, has non-string error values, and has seen general
8343 * fourcc: A `fourcc!` macro was introduced
8344 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8345 hexadecimal literal.
8348 * `rustpkg` has been deprecated and removed from the main repository. Its
8349 replacement, `cargo`, is under development.
8350 * Nightly builds of rust are now available
8351 * The memory usage of rustc has been improved many times throughout this
8353 * The build process supports disabling rpath support for the rustc binary
8355 * Code generation has improved in some cases, giving more information to the
8356 LLVM optimization passes to enable more extensive optimizations.
8357 * Debuginfo compatibility with lldb on OSX has been restored.
8358 * The master branch is now gated on an android bot, making building for
8359 android much more reliable.
8360 * Output flags have been centralized into one `--emit` flag.
8361 * Crate type flags have been centralized into one `--crate-type` flag.
8362 * Codegen flags have been consolidated behind a `-C` flag.
8363 * Linking against outdated crates now has improved error messages.
8364 * Error messages with lifetimes will often suggest how to annotate the
8365 function to fix the error.
8366 * Many more types are documented in the standard library, and new guides
8368 * Many `rustdoc` improvements:
8369 * code blocks are syntax highlighted.
8370 * render standalone markdown files.
8371 * the --test flag tests all code blocks by default.
8372 * exported macros are displayed.
8373 * re-exported types have their documentation inlined at the location of the
8375 * search works across crates that have been rendered to the same output
8379 Version 0.9 (2014-01-09)
8380 ==========================
8382 * ~1800 changes, numerous bugfixes
8385 * The `float` type has been removed. Use `f32` or `f64` instead.
8386 * A new facility for enabling experimental features (feature gating) has
8387 been added, using the crate-level `#[feature(foo)]` attribute.
8388 * Managed boxes (@) are now behind a feature gate
8389 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8390 standard library's `Gc` or `Rc` types instead.
8391 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8392 * Jumping back to the top of a loop is now done with `continue` instead of
8394 * Strings can no longer be mutated through index assignment.
8395 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8396 hash delimiters, as in `r###"foo"###`.
8397 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8399 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8400 * `@fn`s have been removed.
8401 * `do` only works with procs in order to make it obvious what the cost
8403 * Single-element tuple-like structs can no longer be dereferenced to
8404 obtain the inner value. A more comprehensive solution for overloading
8405 the dereference operator will be provided in the future.
8406 * The `#[link(...)]` attribute has been replaced with
8407 `#[crate_id = "name#vers"]`.
8408 * Empty `impl`s must be terminated with empty braces and may not be
8409 terminated with a semicolon.
8410 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8411 no longer has any special meaning.
8412 * The old `fmt!` string formatting macro has been removed.
8413 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8414 `print!` and `println!`.
8415 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8416 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8417 `extern mod foo = "bar"` instead.
8418 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8419 * Macros can have attributes.
8420 * Macros can expand to items with attributes.
8421 * Macros can expand to multiple items.
8422 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8423 * Comments may be nested.
8424 * Values automatically coerce to trait objects they implement, without
8426 * Enum discriminants are no longer an entire word but as small as needed to
8427 contain all the variants. The `repr` attribute can be used to override
8428 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8429 `#[repr(C)]` to match C enums.
8430 * Non-string literals are not allowed in attributes (they never worked).
8431 * The FFI now supports variadic functions.
8432 * Octal numeric literals, as in `0o7777`.
8433 * The `concat!` syntax extension performs compile-time string concatenation.
8434 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8435 removed as Rust no longer uses segmented stacks.
8436 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8437 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8438 not `*`; ignoring remaining fields of a struct is also done with `..`,
8439 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8440 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8441 * `rustc` supports the "system" calling convention, which defaults to the
8442 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8444 * The `type_overflow` lint (default: warn) checks literals for overflow.
8445 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8446 * The `attribute_usage` lint (default: warn) warns about unknown
8448 * The `unknown_features` lint (default: warn) warns about unknown
8450 * The `dead_code` lint (default: warn) checks for dead code.
8451 * Rust libraries can be linked statically to one another
8452 * `#[link_args]` is behind the `link_args` feature gate.
8453 * Native libraries are now linked with `#[link(name = "foo")]`
8454 * Native libraries can be statically linked to a rust crate
8455 (`#[link(name = "foo", kind = "static")]`).
8456 * Native OS X frameworks are now officially supported
8457 (`#[link(name = "foo", kind = "framework")]`).
8458 * The `#[thread_local]` attribute creates thread-local (not task-local)
8459 variables. Currently behind the `thread_local` feature gate.
8460 * The `return` keyword may be used in closures.
8461 * Types that can be copied via a memcpy implement the `Pod` kind.
8462 * The `cfg` attribute can now be used on struct fields and enum variants.
8465 * std: The `option` and `result` API's have been overhauled to make them
8466 simpler, more consistent, and more composable.
8467 * std: The entire `std::io` module has been replaced with one that is
8468 more comprehensive and that properly interfaces with the underlying
8469 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8471 * std: `io::util` contains a number of useful implementations of
8472 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8473 `ZeroReader`, `TeeReader`.
8474 * std: The reference counted pointer type `extra::rc` moved into std.
8475 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8476 just a wrapper around it).
8477 * std: The `Either` type has been removed.
8478 * std: `fmt::Default` can be implemented for any type to provide default
8479 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8480 * std: The `rand` API continues to be tweaked.
8481 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8482 on failure in gdb, is now named `rust_fail`.
8483 * std: The `each_key` and `each_value` methods on `HashMap` have been
8484 replaced by the `keys` and `values` iterators.
8485 * std: Functions dealing with type size and alignment have moved from the
8486 `sys` module to the `mem` module.
8487 * std: The `path` module was written and API changed.
8488 * std: `str::from_utf8` has been changed to cast instead of allocate.
8489 * std: `starts_with` and `ends_with` methods added to vectors via the
8490 `ImmutableEqVector` trait, which is in the prelude.
8491 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8492 if the index is out of bounds.
8493 * std: Task failure no longer propagates between tasks, as the model was
8494 complex, expensive, and incompatible with thread-based tasks.
8495 * std: The `Any` type can be used for dynamic typing.
8496 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8498 * std: Methods that produce iterators generally do not have an `_iter`
8500 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8501 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8502 * std: `util::ignore` renamed to `prelude::drop`.
8503 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8505 * std: `vec::raw` has seen a lot of cleanup and API changes.
8506 * std: The standard library no longer includes any C++ code, and very
8507 minimal C, eliminating the dependency on libstdc++.
8508 * std: Runtime scheduling and I/O functionality has been factored out into
8509 extensible interfaces and is now implemented by two different crates:
8510 libnative, for native threading and I/O; and libgreen, for green threading
8511 and I/O. This paves the way for using the standard library in more limited
8512 embedded environments.
8513 * std: The `comm` module has been rewritten to be much faster, have a
8514 simpler, more consistent API, and to work for both native and green
8516 * std: All libuv dependencies have been moved into the rustuv crate.
8517 * native: New implementations of runtime scheduling on top of OS threads.
8518 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8520 * green: The green thread scheduler and message passing types are almost
8522 * extra: The `flatpipes` module had bitrotted and was removed.
8523 * extra: All crypto functions have been removed and Rust now has a policy of
8524 not reimplementing crypto in the standard library. In the future crypto
8525 will be provided by external crates with bindings to established libraries.
8526 * extra: `c_vec` has been modernized.
8527 * extra: The `sort` module has been removed. Use the `sort` method on
8531 * The `rust` and `rusti` commands have been removed, due to lack of
8533 * `rustdoc` was completely rewritten.
8534 * `rustdoc` can test code examples in documentation.
8535 * `rustpkg` can test packages with the argument, 'test'.
8536 * `rustpkg` supports arbitrary dependencies, including C libraries.
8537 * `rustc`'s support for generating debug info is improved again.
8538 * `rustc` has better error reporting for unbalanced delimiters.
8539 * `rustc`'s JIT support was removed due to bitrot.
8540 * Executables and static libraries can be built with LTO (-Z lto)
8541 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8545 Version 0.8 (2013-09-26)
8546 ============================
8548 * ~2200 changes, numerous bugfixes
8551 * The `for` loop syntax has changed to work with the `Iterator` trait.
8552 * At long last, unwinding works on Windows.
8553 * Default methods are ready for use.
8554 * Many trait inheritance bugs fixed.
8555 * Owned and borrowed trait objects work more reliably.
8556 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8557 * rustc can omit emission of code for the `debug!` macro if it is passed
8559 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8560 for foo.rs, then foo/mod.rs, and will generate an error when both are
8562 * Strings no longer contain trailing nulls. The new `std::c_str` module
8563 provides new mechanisms for converting to C strings.
8564 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8565 * The FFI has been overhauled such that foreign functions are called directly,
8566 instead of through a stack-switching wrapper.
8567 * Calling a foreign function must be done through a Rust function with the
8568 `#[fixed_stack_segment]` attribute.
8569 * The `externfn!` macro can be used to declare both a foreign function and
8570 a `#[fixed_stack_segment]` wrapper at once.
8571 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8572 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8573 * `priv` is disallowed everywhere except for struct fields and enum variants.
8574 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8575 * `ref` bindings in irrefutable patterns work correctly now.
8576 * `char` is now prevented from containing invalid code points.
8577 * Casting to `bool` is no longer allowed.
8578 * `\0` is now accepted as an escape in chars and strings.
8579 * `yield` is a reserved keyword.
8580 * `typeof` is a reserved keyword.
8581 * Crates may be imported by URL with `extern mod foo = "url";`.
8582 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8583 * Static vectors can be initialized with repeating elements,
8584 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8585 * Static structs can be initialized with functional record update,
8586 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8587 * `cfg!` can be used to conditionally execute code based on the crate
8588 configuration, similarly to `#[cfg(...)]`.
8589 * The `unnecessary_qualification` lint detects unneeded module
8590 prefixes (default: allow).
8591 * Arithmetic operations have been implemented on the SIMD types in
8592 `std::unstable::simd`.
8593 * Exchange allocation headers were removed, reducing memory usage.
8594 * `format!` implements a completely new, extensible, and higher-performance
8595 string formatting system. It will replace `fmt!`.
8596 * `print!` and `println!` write formatted strings (using the `format!`
8597 extension) to stdout.
8598 * `write!` and `writeln!` write formatted strings (using the `format!`
8599 extension) to the new Writers in `std::rt::io`.
8600 * The library section in which a function or static is placed may
8601 be specified with `#[link_section = "..."]`.
8602 * The `proto!` syntax extension for defining bounded message protocols
8604 * `macro_rules!` is hygienic for `let` declarations.
8605 * The `#[export_name]` attribute specifies the name of a symbol.
8606 * `unreachable!` can be used to indicate unreachable code, and fails
8610 * std: Transitioned to the new runtime, written in Rust.
8611 * std: Added an experimental I/O library, `rt::io`, based on the new
8613 * std: A new generic `range` function was added to the prelude, replacing
8614 `uint::range` and friends.
8615 * std: `range_rev` no longer exists. Since range is an iterator it can be
8616 reversed with `range(lo, hi).invert()`.
8617 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8618 renamed to `unwrap_or`.
8619 * std: The `iterator` module was renamed to `iter`.
8620 * std: Integral types now support the `checked_add`, `checked_sub`, and
8621 `checked_mul` operations for detecting overflow.
8622 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8624 * std: Methods are standardizing on conventions for casting methods:
8625 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8627 * std: The `CString` type in `c_str` provides new ways to convert to and
8629 * std: `DoubleEndedIterator` can yield elements in two directions.
8630 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8632 * std: `str::from_bytes` renamed to `str::from_utf8`.
8633 * std: `pop_opt` and `shift_opt` methods added to vectors.
8634 * std: The task-local data interface no longer uses @, and keys are
8635 no longer function pointers.
8636 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8637 * std: Added `SharedPort` to `comm`.
8638 * std: `Eq` has a default method for `ne`; only `eq` is required
8640 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8641 is required in implementations.
8642 * std: `is_utf8` performance is improved, impacting many string functions.
8643 * std: `os::MemoryMap` provides cross-platform mmap.
8644 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8645 are not 'in-bounds' are considered undefined.
8646 * std: Many freestanding functions in `vec` removed in favor of methods.
8647 * std: Many freestanding functions on scalar types removed in favor of
8649 * std: Many options to task builders were removed since they don't make
8650 sense in the new scheduler design.
8651 * std: More containers implement `FromIterator` so can be created by the
8653 * std: More complete atomic types in `unstable::atomics`.
8654 * std: `comm::PortSet` removed.
8655 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8656 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8657 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8658 default implementations.
8659 * std: Various `from_str` functions were removed in favor of a generic
8660 `from_str` which is available in the prelude.
8661 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8662 * extra: `dlist`, the doubly-linked list was modernized.
8663 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8664 * extra: Added `glob` module, replacing `std::os::glob`.
8665 * extra: `rope` was removed.
8666 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8667 * extra: `net`, and `timer` were removed. The experimental replacements
8668 are `std::rt::io::net` and `std::rt::io::timer`.
8669 * extra: Iterators implemented for `SmallIntMap`.
8670 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8671 * extra: `SmallIntSet` removed. Use `BitvSet`.
8672 * extra: Performance of JSON parsing greatly improved.
8673 * extra: `semver` updated to SemVer 2.0.0.
8674 * extra: `term` handles more terminals correctly.
8675 * extra: `dbg` module removed.
8676 * extra: `par` module removed.
8677 * extra: `future` was cleaned up, with some method renames.
8678 * extra: Most free functions in `getopts` were converted to methods.
8681 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8682 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8683 similarly to gcc's `--march` flag.
8684 * rustc's performance compiling small crates is much better.
8685 * rustpkg has received many improvements.
8686 * rustpkg supports git tags as package IDs.
8687 * rustpkg builds into target-specific directories so it can be used for
8689 * The number of concurrent test tasks is controlled by the environment
8690 variable RUST_TEST_TASKS.
8691 * The test harness can now report metrics for benchmarks.
8692 * All tools have man pages.
8693 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8694 * The runtime uses jemalloc for allocations.
8695 * Segmented stacks are temporarily disabled as part of the transition to
8696 the new runtime. Stack overflows are possible!
8697 * A new documentation backend, rustdoc_ng, is available for use. It is
8698 still invoked through the normal `rustdoc` command.
8701 Version 0.7 (2013-07-03)
8702 =======================
8704 * ~2000 changes, numerous bugfixes
8707 * `impl`s no longer accept a visibility qualifier. Put them on methods
8709 * The borrow checker has been rewritten with flow-sensitivity, fixing
8710 many bugs and inconveniences.
8711 * The `self` parameter no longer implicitly means `&'self self`,
8712 and can be explicitly marked with a lifetime.
8713 * Overloadable compound operators (`+=`, etc.) have been temporarily
8714 removed due to bugs.
8715 * The `for` loop protocol now requires `for`-iterators to return `bool`
8716 so they compose better.
8717 * The `Durable` trait is replaced with the `'static` bounds.
8718 * Trait default methods work more often.
8719 * Structs with the `#[packed]` attribute have byte alignment and
8720 no padding between fields.
8721 * Type parameters bound by `Copy` must now be copied explicitly with
8723 * It is now illegal to move out of a dereferenced unsafe pointer.
8724 * `Option<~T>` is now represented as a nullable pointer.
8725 * `@mut` does dynamic borrow checks correctly.
8726 * The `main` function is only detected at the topmost level of the crate.
8727 The `#[main]` attribute is still valid anywhere.
8728 * Struct fields may no longer be mutable. Use inherited mutability.
8729 * The `#[no_send]` attribute makes a type that would otherwise be
8731 * The `#[no_freeze]` attribute makes a type that would otherwise be
8733 * Unbounded recursion will abort the process after reaching the limit
8734 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8735 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8736 are never implicitly copyable.
8737 * `#[static_assert]` makes compile-time assertions about static bools.
8738 * At long last, 'argument modes' no longer exist.
8739 * The rarely used `use mod` statement no longer exists.
8742 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8744 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8745 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8747 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8748 and unsuffixed integer literals.
8751 * The `core` crate was renamed to `std`.
8752 * The `std` crate was renamed to `extra`.
8753 * More and improved documentation.
8754 * std: `iterator` module for external iterator objects.
8755 * Many old-style (internal, higher-order function) iterators replaced by
8756 implementations of `Iterator`.
8757 * std: Many old internal vector and string iterators,
8758 incl. `any`, `all`. removed.
8759 * std: The `finalize` method of `Drop` renamed to `drop`.
8760 * std: The `drop` method now takes `&mut self` instead of `&self`.
8761 * std: The prelude no longer re-exports any modules, only types and traits.
8762 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8763 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8764 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8765 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8766 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8767 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8768 * std: Many types implement `Clone`.
8769 * std: `path` type renamed to `Path`.
8770 * std: `mut` module and `Mut` type removed.
8771 * std: Many standalone functions removed in favor of methods and iterators
8772 in `vec`, `str`. In the future methods will also work as functions.
8773 * std: `reinterpret_cast` removed. Use `transmute`.
8774 * std: ascii string handling in `std::ascii`.
8775 * std: `Rand` is implemented for ~/@.
8776 * std: `run` module for spawning processes overhauled.
8777 * std: Various atomic types added to `unstable::atomic`.
8778 * std: Various types implement `Zero`.
8779 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8780 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8781 * std: Added `os::mkdir_recursive`.
8782 * std: Added `os::glob` function performs filesystems globs.
8783 * std: `FuzzyEq` renamed to `ApproxEq`.
8784 * std: `Map` now defines `pop` and `swap` methods.
8785 * std: `Cell` constructors converted to static methods.
8786 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8787 * extra: `flate` module moved from `std` to `extra`.
8788 * extra: `fileinput` module for iterating over a series of files.
8789 * extra: `Complex` number type and `complex` module.
8790 * extra: `Rational` number type and `rational` module.
8791 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8792 * extra: `term` uses terminfo now, is more correct.
8793 * extra: `arc` functions converted to methods.
8794 * extra: Implementation of fixed output size variations of SHA-2.
8797 * `unused_variables` lint mode for unused variables (default: warn).
8798 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8800 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8802 * `dead_assignment` lint mode for unread variables (default: warn).
8803 * `unnecessary_allocation` lint mode detects some heap allocations that are
8804 immediately borrowed so could be written without allocating (default: warn).
8805 * `missing_doc` lint mode (default: allow).
8806 * `unreachable_code` lint mode (default: warn).
8807 * The `rusti` command has been rewritten and a number of bugs addressed.
8808 * rustc outputs in color on more terminals.
8809 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8810 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8811 * Compiling with `-g` will make the binary record information about
8812 dynamic borrowcheck failures for debugging.
8813 * rustdoc has a nicer stylesheet.
8814 * Various improvements to rustdoc.
8815 * Improvements to rustpkg (see the detailed release notes).
8818 Version 0.6 (2013-04-03)
8819 ========================
8821 * ~2100 changes, numerous bugfixes
8824 * The self type parameter in traits is now spelled `Self`
8825 * The `self` parameter in trait and impl methods must now be explicitly
8826 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8827 * Static methods no longer require the `static` keyword and instead
8828 are distinguished by the lack of a `self` parameter
8829 * Replaced the `Durable` trait with the `'static` lifetime
8830 * The old closure type syntax with the trailing sigil has been
8831 removed in favor of the more consistent leading sigil
8832 * `super` is a keyword, and may be prefixed to paths
8833 * Trait bounds are separated with `+` instead of whitespace
8834 * Traits are implemented with `impl Trait for Type`
8835 instead of `impl Type: Trait`
8836 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8837 * The `export` keyword has finally been removed
8838 * The `move` keyword has been removed (see "Semantic changes")
8839 * The interior mutability qualifier on vectors, `[mut T]`, has been
8840 removed. Use `&mut [T]`, etc.
8841 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8842 * `fail` is no longer a keyword. Use `fail!()`
8843 * `assert` is no longer a keyword. Use `assert!()`
8844 * `log` is no longer a keyword. use `debug!`, etc.
8845 * 1-tuples may be represented as `(T,)`
8846 * Struct fields may no longer be `mut`. Use inherited mutability,
8847 `@mut T`, `core::mut` or `core::cell`
8848 * `extern mod { ... }` is no longer valid syntax for foreign
8849 function modules. Use extern blocks: `extern { ... }`
8850 * Newtype enums removed. Use tuple-structs.
8851 * Trait implementations no longer support visibility modifiers
8852 * Pattern matching over vectors improved and expanded
8853 * `const` renamed to `static` to correspond to lifetime name,
8854 and make room for future `static mut` unsafe mutable globals.
8855 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8856 * `Clone` implementations can be automatically generated with
8857 `#[deriving(Clone)]`
8858 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8859 instead of `foo as Bar`.
8860 * Fixed length vector types are now written as `[int, .. 3]`
8861 instead of `[int * 3]`.
8862 * Fixed length vector types can express the length as a constant
8863 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8866 * Types with owned pointers or custom destructors move by default,
8867 eliminating the `move` keyword
8868 * All foreign functions are considered unsafe
8869 * &mut is now unaliasable
8870 * Writes to borrowed @mut pointers are prevented dynamically
8872 * The name of the main function can be customized using #[main]
8873 * The default type of an inferred closure is &fn instead of @fn
8874 * `use` statements may no longer be "chained" - they cannot import
8875 identifiers imported by previous `use` statements
8876 * `use` statements are crate relative, importing from the "top"
8877 of the crate by default. Paths may be prefixed with `super::`
8878 or `self::` to change the search behavior.
8879 * Method visibility is inherited from the implementation declaration
8880 * Structural records have been removed
8881 * Many more types can be used in static items, including enums
8882 'static-lifetime pointers and vectors
8883 * Pattern matching over vectors improved and expanded
8884 * Typechecking of closure types has been overhauled to
8885 improve inference and eliminate unsoundness
8886 * Macros leave scope at the end of modules, unless that module is
8887 tagged with #[macro_escape]
8890 * Added big integers to `std::bigint`
8891 * Removed `core::oldcomm` module
8892 * Added pipe-based `core::comm` module
8893 * Numeric traits have been reorganized under `core::num`
8894 * `vec::slice` finally returns a slice
8895 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8896 * Containers reorganized around traits in `core::container`
8897 * `core::dvec` removed, `~[T]` is a drop-in replacement
8898 * `core::send_map` renamed to `core::hashmap`
8899 * `std::map` removed; replaced with `core::hashmap`
8900 * `std::treemap` reimplemented as an owned balanced tree
8901 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8902 * `core::trie` added as a fast ordered map for integer keys
8903 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8904 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8905 overload the comparison operators, whereas `TotalOrd` is used
8906 by certain container types
8909 * Replaced the 'cargo' package manager with 'rustpkg'
8910 * Added all-purpose 'rust' tool
8911 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8912 * rustc now *attempts* to offer spelling suggestions
8913 * Improved support for ARM and Android
8914 * Preliminary MIPS backend
8915 * Improved foreign function ABI implementation for x86, x86_64
8916 * Various memory usage improvements
8917 * Rust code may be embedded in foreign code under limited circumstances
8918 * Inline assembler supported by new asm!() syntax extension.
8921 Version 0.5 (2012-12-21)
8922 ===========================
8924 * ~900 changes, numerous bugfixes
8927 * Removed `<-` move operator
8928 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8929 * Removed old fixed length vector syntax - `[T]/N`
8930 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8931 * Macros may now expand to items and statements
8932 * `a.b()` is always parsed as a method call, never as a field projection
8933 * `Eq` and `IterBytes` implementations can be automatically generated
8934 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8935 * Removed the special crate language for `.rc` files
8936 * Function arguments may consist of any irrefutable pattern
8939 * `&` and `~` pointers may point to objects
8940 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8941 * Enum variants may be structs
8942 * Destructors can be added to all nominal types with the Drop trait
8943 * Structs and nullary enum variants may be constants
8944 * Values that cannot be implicitly copied are now automatically moved
8945 without writing `move` explicitly
8946 * `&T` may now be coerced to `*T`
8947 * Coercions happen in `let` statements as well as function calls
8948 * `use` statements now take crate-relative paths
8949 * The module and type namespaces have been merged so that static
8950 method names can be resolved under the trait in which they are
8953 * Improved support for language features
8954 * Trait inheritance works in many scenarios
8955 * More support for explicit self arguments in methods - `self`, `&self`
8956 `@self`, and `~self` all generally work as expected
8957 * Static methods work in more situations
8958 * Experimental: Traits may declare default methods for the implementations
8962 * New condition handling system in `core::condition`
8963 * Timsort added to `std::sort`
8964 * New priority queue, `std::priority_queue`
8965 * Pipes for serializable types, `std::flatpipes'
8966 * Serialization overhauled to be trait-based
8967 * Expanded `getopts` definitions
8968 * Moved futures to `std`
8969 * More functions are pure now
8970 * `core::comm` renamed to `oldcomm`. Still deprecated
8971 * `rustdoc` and `cargo` are libraries now
8974 * Added a preliminary REPL, `rusti`
8975 * License changed from MIT to dual MIT/APL2
8978 Version 0.4 (2012-10-15)
8979 ==========================
8981 * ~2000 changes, numerous bugfixes
8984 * All keywords are now strict and may not be used as identifiers anywhere
8985 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8986 'of', 'with', 'to', 'class'.
8987 * Classes are replaced with simpler structs
8988 * Explicit method self types
8989 * `ret` became `return` and `alt` became `match`
8990 * `import` is now `use`; `use is now `extern mod`
8991 * `extern mod { ... }` is now `extern { ... }`
8992 * `use mod` is the recommended way to import modules
8993 * `pub` and `priv` replace deprecated export lists
8994 * The syntax of `match` pattern arms now uses fat arrow (=>)
8995 * `main` no longer accepts an args vector; use `os::args` instead
8998 * Trait implementations are now coherent, ala Haskell typeclasses
8999 * Trait methods may be static
9000 * Argument modes are deprecated
9001 * Borrowed pointers are much more mature and recommended for use
9002 * Strings and vectors in the static region are stored in constant memory
9003 * Typestate was removed
9004 * Resolution rewritten to be more reliable
9005 * Support for 'dual-mode' data structures (freezing and thawing)
9008 * Most binary operators can now be overloaded via the traits in
9010 * `std::net::url` for representing URLs
9011 * Sendable hash maps in `core::send_map`
9012 * `core::task' gained a (currently unsafe) task-local storage API
9015 * An efficient new intertask communication primitive called the pipe,
9016 along with a number of higher-level channel types, in `core::pipes`
9017 * `std::arc`, an atomically reference counted, immutable, shared memory
9019 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9020 * Futures are now based on pipes and sendable
9021 * More robust linked task failure
9022 * Improved task builder API
9025 * Improved error reporting
9026 * Preliminary JIT support
9027 * Preliminary work on precise GC
9028 * Extensive architectural improvements to rustc
9029 * Begun a transition away from buggy C++-based reflection (shape) code to
9030 Rust-based (visitor) code
9031 * All hash functions and tables converted to secure, randomized SipHash
9034 Version 0.3 (2012-07-12)
9035 ========================
9037 * ~1900 changes, numerous bugfixes
9039 * New coding conveniences
9040 * Integer-literal suffix inference
9041 * Per-item control over warnings, errors
9042 * #[cfg(windows)] and #[cfg(unix)] attributes
9043 * Documentation comments
9044 * More compact closure syntax
9045 * 'do' expressions for treating higher-order functions as
9047 * *-patterns (wildcard extended to all constructor fields)
9050 * Name resolution pass and exhaustiveness checker rewritten
9051 * Region pointers and borrow checking supersede alias
9053 * Init-ness checking is now provided by a region-based liveness
9054 pass instead of the typestate pass; same for last-use analysis
9055 * Extensive work on region pointers
9057 * Experimental new language features
9058 * Slices and fixed-size, interior-allocated vectors
9059 * #!-comments for lang versioning, shell execution
9060 * Destructors and iface implementation for classes;
9061 type-parameterized classes and class methods
9062 * 'const' type kind for types that can be used to implement
9063 shared-memory concurrency patterns
9067 * Removal of various obsolete features
9068 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9069 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9071 * Constructs: do-while loops ('do' repurposed), fn binding,
9072 resources (replaced by destructors)
9074 * Compiler reorganization
9075 * Syntax-layer of compiler split into separate crate
9076 * Clang (from LLVM project) integrated into build
9077 * Typechecker split into sub-modules
9080 * New time functions
9081 * Extension methods for many built-in types
9082 * Arc: atomic-refcount read-only / exclusive-use shared cells
9083 * Par: parallel map and search routines
9084 * Extensive work on libuv interface
9085 * Much vector code moved to libraries
9086 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9087 #include, #include_str, #include_bin
9090 * Cargo automatically resolves dependencies
9093 Version 0.2 (2012-03-29)
9094 =========================
9096 * >1500 changes, numerous bugfixes
9098 * New docs and doc tooling
9100 * New port: FreeBSD x86_64
9102 * Compilation model enhancements
9103 * Generics now specialized, multiply instantiated
9104 * Functions now inlined across separate crates
9106 * Scheduling, stack and threading fixes
9107 * Noticeably improved message-passing performance
9108 * Explicit schedulers
9112 * Experimental new language features
9113 * Operator overloading
9117 * Various language extensions
9118 * C-callback function types: 'crust fn ...'
9119 * Infinite-loop construct: 'loop { ... }'
9120 * Shorten 'mutable' to 'mut'
9121 * Required mutable-local qualifier: 'let mut ...'
9122 * Basic glob-exporting: 'export foo::*;'
9123 * Alt now exhaustive, 'alt check' for runtime-checked
9124 * Block-function form of 'for' loop, with 'break' and 'ret'.
9127 * AST quasi-quote syntax extension
9128 * Revived libuv interface
9129 * New modules: core::{future, iter}, std::arena
9130 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9131 * Extensive cleanup, regularization in libstd, libcore
9134 Version 0.1 (2012-01-20)
9135 ===============================
9137 * Most language features work, including:
9138 * Unique pointers, unique closures, move semantics
9139 * Interface-constrained generics
9140 * Static interface dispatch
9142 * Multithread task scheduling
9143 * Typestate predicates
9144 * Failure unwinding, destructors
9145 * Pattern matching and destructuring assignment
9146 * Lightweight block-lambda syntax
9147 * Preliminary macro-by-example
9149 * Compiler works with the following configurations:
9150 * Linux: x86 and x86_64 hosts and targets
9151 * macOS: x86 and x86_64 hosts and targets
9152 * Windows: x86 hosts and targets
9154 * Cross compilation / multi-target configuration supported.
9156 * Preliminary API-documentation and package-management tools included.
9160 * Documentation is incomplete.
9162 * Performance is below intended target.
9164 * Standard library APIs are subject to extensive change, reorganization.
9166 * Language-level versioning is not yet operational - future code will