1 Version 1.47.0 (2020-10-08)
2 ==========================
6 - [Closures will now warn when not used.][74869]
10 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
11 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
13 - [Upgraded to LLVM 11.][73526]
14 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
15 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
16 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
18 \* Refer to Rust's [platform support page][forge-platform-support] for more
19 information on Rust's tiered platform support.
23 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
24 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
25 those of length less than 33.][74060]
26 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
27 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
28 `PartialEq`, and `PartialOrd`.][73583]
34 - [`RangeInclusive::is_empty`]
35 - [`Result::as_deref`]
36 - [`Result::as_deref_mut`]
38 - [`pointer::offset_from`]
42 The following previously stable APIs have now been made const.
44 - [The `new` method for all `NonZero` integers.][73858]
45 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
46 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
47 methods for all integers.][73858]
48 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
49 signed integers.][73858]
50 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
51 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
52 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
53 `is_ascii_control` methods for `char` and `u8`.][73858]
57 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
58 You can override this by setting the following in your `Cargo.toml`.
60 [profile.release.build-override]
63 - [`cargo-help` will now display man pages for commands rather just the
64 `--help` text.][cargo/8456]
65 - [`cargo-metadata` now emits a `test` field indicating if a target has
66 tests enabled.][cargo/8478]
67 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
68 - [`cargo-publish` will now use an alternative registry by default if it's the
69 only registry specified in `package.publish`.][cargo/8571]
73 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
74 type based search.][75366]
75 - [Added the Ayu theme to rustdoc.][71237]
79 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
80 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
81 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
82 help to preserve more span information.][73084] These changes may cause
83 compiliation errors if your macro was unhygenic or didn't correctly handle
85 - [Moved support for the CloudABI target to tier 3.][75568]
86 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
87 - [Added the `rustc-docs` component.][75560] This allows you to install
88 and read the documentation for the compiler internal APIs. (Currently only
89 available for `x86_64-unknown-linux-gnu`.)
93 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
95 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
96 [75048]: https://github.com/rust-lang/rust/pull/75048/
97 [74163]: https://github.com/rust-lang/rust/pull/74163/
98 [71237]: https://github.com/rust-lang/rust/pull/71237/
99 [74869]: https://github.com/rust-lang/rust/pull/74869/
100 [73858]: https://github.com/rust-lang/rust/pull/73858/
101 [75716]: https://github.com/rust-lang/rust/pull/75716/
102 [75908]: https://github.com/rust-lang/rust/pull/75908/
103 [75516]: https://github.com/rust-lang/rust/pull/75516/
104 [75560]: https://github.com/rust-lang/rust/pull/75560/
105 [75568]: https://github.com/rust-lang/rust/pull/75568/
106 [75366]: https://github.com/rust-lang/rust/pull/75366/
107 [75204]: https://github.com/rust-lang/rust/pull/75204/
108 [74650]: https://github.com/rust-lang/rust/pull/74650/
109 [74419]: https://github.com/rust-lang/rust/pull/74419/
110 [73964]: https://github.com/rust-lang/rust/pull/73964/
111 [74021]: https://github.com/rust-lang/rust/pull/74021/
112 [74060]: https://github.com/rust-lang/rust/pull/74060/
113 [73893]: https://github.com/rust-lang/rust/pull/73893/
114 [73526]: https://github.com/rust-lang/rust/pull/73526/
115 [73583]: https://github.com/rust-lang/rust/pull/73583/
116 [73084]: https://github.com/rust-lang/rust/pull/73084/
117 [73197]: https://github.com/rust-lang/rust/pull/73197/
118 [72488]: https://github.com/rust-lang/rust/pull/72488/
119 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
120 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
121 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
122 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
123 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
124 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
125 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
126 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
127 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
128 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
129 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
130 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
131 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
132 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
133 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
136 Version 1.46.0 (2020-08-27)
137 ==========================
141 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
142 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
143 const functions.][73862]
144 - [The `#[track_caller]` attribute can now be added to functions to use the
145 function's caller's location information for panic messages.][72445]
146 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
147 `x.0.0` over `(x.0).0`.
148 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
149 You currently can't use `mem::transmute` in constant functions.
153 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
154 - [Enabled static "Position Independent Executables" by default
155 for `x86_64-unknown-linux-musl`.][70740]
159 - [`mem::forget` is now a `const fn`.][73887]
160 - [`String` now implements `From<char>`.][73466]
161 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
162 integer types.][73032]
163 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
164 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
165 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
166 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
167 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
168 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
173 - [`vec::Drain::as_slice`]
177 Added a number of new environment variables that are now available when
178 compiling your crate.
180 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
181 the specific binary being compiled and the name of the crate.
182 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
183 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
187 - [The target configuration option `abi_blacklist` has been renamed
188 to `unsupported_abis`.][74150] The old name will still continue to work.
189 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
190 This was previously accepted but will become a hard error in a future release.
191 - [Rustc will fail to compile if you have a struct with
192 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
194 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
195 ensure that spans have the correct information, and may cause breakage if you
196 were relying on receiving spans with dummy information.
197 - [The InnoSetup installer for Windows is no longer available.][72569] This was
198 a legacy installer that was replaced by a MSI installer a few years ago but
199 was still being built.
200 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
201 - [Rustc will no longer accept overlapping trait implementations that only
202 differ in how the lifetime was bound.][72493]
203 - [Rustc now correctly relates the lifetime of an existential associated
204 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
205 you to pass a shorter lifetime than expected.
206 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
207 The library will need to be installed for `rustc` to work, even though we
208 expect it to be already available on most systems.
209 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
211 - [Pretty printing of some tokens in procedural macros changed.][75453] The
212 exact output returned by rustc's pretty printing is an unstable
213 implementation detail: we recommend any macro relying on it to switch to a
214 more robust parsing system.
216 [75453]: https://github.com/rust-lang/rust/issues/75453/
217 [74820]: https://github.com/rust-lang/rust/issues/74820/
218 [74420]: https://github.com/rust-lang/rust/issues/74420/
219 [74109]: https://github.com/rust-lang/rust/pull/74109/
220 [74150]: https://github.com/rust-lang/rust/pull/74150/
221 [73862]: https://github.com/rust-lang/rust/pull/73862/
222 [73887]: https://github.com/rust-lang/rust/pull/73887/
223 [73466]: https://github.com/rust-lang/rust/pull/73466/
224 [73516]: https://github.com/rust-lang/rust/pull/73516/
225 [73293]: https://github.com/rust-lang/rust/pull/73293/
226 [73007]: https://github.com/rust-lang/rust/pull/73007/
227 [73032]: https://github.com/rust-lang/rust/pull/73032/
228 [72920]: https://github.com/rust-lang/rust/pull/72920/
229 [72569]: https://github.com/rust-lang/rust/pull/72569/
230 [72583]: https://github.com/rust-lang/rust/pull/72583/
231 [72584]: https://github.com/rust-lang/rust/pull/72584/
232 [72717]: https://github.com/rust-lang/rust/pull/72717/
233 [72437]: https://github.com/rust-lang/rust/pull/72437/
234 [72445]: https://github.com/rust-lang/rust/pull/72445/
235 [72486]: https://github.com/rust-lang/rust/pull/72486/
236 [72493]: https://github.com/rust-lang/rust/pull/72493/
237 [72331]: https://github.com/rust-lang/rust/pull/72331/
238 [71896]: https://github.com/rust-lang/rust/pull/71896/
239 [71660]: https://github.com/rust-lang/rust/pull/71660/
240 [71322]: https://github.com/rust-lang/rust/pull/71322/
241 [70740]: https://github.com/rust-lang/rust/pull/70740/
242 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
243 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
244 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
245 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
246 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
249 Version 1.45.2 (2020-08-03)
250 ==========================
252 * [Fix bindings in tuple struct patterns][74954]
253 * [Fix track_caller integration with trait objects][74784]
255 [74954]: https://github.com/rust-lang/rust/issues/74954
256 [74784]: https://github.com/rust-lang/rust/issues/74784
259 Version 1.45.1 (2020-07-30)
260 ==========================
262 * [Fix const propagation with references.][73613]
263 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
264 * [Avoid spurious implicit region bound.][74509]
265 * [Install clippy on x.py install][74457]
267 [73613]: https://github.com/rust-lang/rust/pull/73613
268 [73078]: https://github.com/rust-lang/rust/issues/73078
269 [74509]: https://github.com/rust-lang/rust/pull/74509
270 [74457]: https://github.com/rust-lang/rust/pull/74457
273 Version 1.45.0 (2020-07-16)
274 ==========================
278 - [Out of range float to int conversions using `as` has been defined as a saturating
279 conversion.][71269] This was previously undefined behaviour, but you can use the
280 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
281 may be desirable in rare performance sensitive situations.
282 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
284 - [Function like procedural macros can now be used in expression, pattern, and statement
285 positions.][68717] This means you can now use a function-like procedural macro
286 anywhere you can use a declarative (`macro_rules!`) macro.
290 - [You can now override individual target features through the `target-feature`
291 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
292 equivalent to `-C target-feature=+avx2,+fma`.
293 - [Added the `force-unwind-tables` flag.][69984] This option allows
294 rustc to always generate unwind tables regardless of panic strategy.
295 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
296 to include LLVM bitcode into generated `rlib`s (this is on by default).
297 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
298 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
299 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
300 - [Upgraded to LLVM 10.][67759]
302 \* Refer to Rust's [platform support page][forge-platform-support] for more
303 information on Rust's tiered platform support.
308 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
310 - [`proc_macro::TokenStream` now implements `Default`.][72234]
311 - [You can now use `char` with
312 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
313 a range of codepoints.][72413] E.g.
314 you can now write the following;
316 for ch in 'a'..='z' {
320 // Prints "abcdefghijklmnopqrstuvwxyz"
322 - [`OsString` now implements `FromStr`.][71662]
323 - [The `saturating_neg` method has been added to all signed integer primitive
324 types, and the `saturating_abs` method has been added for all integer
325 primitive types.][71886]
326 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
327 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
329 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
330 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
331 integer types.][69813]
332 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
333 integer types.][72324]
334 - [The `fetch_update` method has been added to all atomic integer types.][71843]
339 - [`BTreeMap::remove_entry`]
341 - [`rc::Weak::as_ptr`]
342 - [`rc::Weak::from_raw`]
343 - [`rc::Weak::into_raw`]
344 - [`str::strip_prefix`]
345 - [`str::strip_suffix`]
346 - [`sync::Weak::as_ptr`]
347 - [`sync::Weak::from_raw`]
348 - [`sync::Weak::into_raw`]
349 - [`char::UNICODE_VERSION`]
350 - [`Span::resolved_at`]
351 - [`Span::located_at`]
352 - [`Span::mixed_site`]
353 - [`unix::process::CommandExt::arg0`]
358 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
363 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
364 `~~outdated information~~` becomes "~~outdated information~~".
365 - [Added an emoji to Rustdoc's deprecated API message.][72014]
369 - [Trying to self initialize a static value (that is creating a value using
370 itself) is unsound and now causes a compile error.][71140]
371 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
372 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
373 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
374 previously undocumented and not intended for public use. Rustdoc still provides
375 a non-zero exit code on errors.
376 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
377 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
378 flags while cargo is adding `embed-bitcode` itself. The recommended way to
379 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
380 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
384 - [Make clippy a git subtree instead of a git submodule][70655]
385 - [Unify the undo log of all snapshot types][69464]
387 [71848]: https://github.com/rust-lang/rust/issues/71848/
388 [73420]: https://github.com/rust-lang/rust/issues/73420/
389 [72324]: https://github.com/rust-lang/rust/pull/72324/
390 [71843]: https://github.com/rust-lang/rust/pull/71843/
391 [71886]: https://github.com/rust-lang/rust/pull/71886/
392 [72234]: https://github.com/rust-lang/rust/pull/72234/
393 [72239]: https://github.com/rust-lang/rust/pull/72239/
394 [72397]: https://github.com/rust-lang/rust/pull/72397/
395 [72413]: https://github.com/rust-lang/rust/pull/72413/
396 [72014]: https://github.com/rust-lang/rust/pull/72014/
397 [72062]: https://github.com/rust-lang/rust/pull/72062/
398 [72094]: https://github.com/rust-lang/rust/pull/72094/
399 [72133]: https://github.com/rust-lang/rust/pull/72133/
400 [67759]: https://github.com/rust-lang/rust/pull/67759/
401 [71900]: https://github.com/rust-lang/rust/pull/71900/
402 [71928]: https://github.com/rust-lang/rust/pull/71928/
403 [71662]: https://github.com/rust-lang/rust/pull/71662/
404 [71716]: https://github.com/rust-lang/rust/pull/71716/
405 [71447]: https://github.com/rust-lang/rust/pull/71447/
406 [71269]: https://github.com/rust-lang/rust/pull/71269/
407 [71095]: https://github.com/rust-lang/rust/pull/71095/
408 [71140]: https://github.com/rust-lang/rust/pull/71140/
409 [70655]: https://github.com/rust-lang/rust/pull/70655/
410 [70705]: https://github.com/rust-lang/rust/pull/70705/
411 [69984]: https://github.com/rust-lang/rust/pull/69984/
412 [69813]: https://github.com/rust-lang/rust/pull/69813/
413 [69464]: https://github.com/rust-lang/rust/pull/69464/
414 [68717]: https://github.com/rust-lang/rust/pull/68717/
415 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
416 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
417 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
418 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
419 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
420 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
421 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
422 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
423 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
424 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
425 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
426 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
427 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
428 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
429 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
430 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
431 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
434 Version 1.44.1 (2020-06-18)
435 ===========================
437 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
438 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
439 * [Fix crashes when finding backtrace on macOS.][71397]
440 * [Clippy applies lint levels into different files.][clippy/5356]
442 [71397]: https://github.com/rust-lang/rust/issues/71397
443 [73078]: https://github.com/rust-lang/rust/issues/73078
444 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
445 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
448 Version 1.44.0 (2020-06-04)
449 ==========================
453 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
454 - [Added the `unused_braces` lint.][70081]
456 **Syntax-only changes**
458 - [Expansion-driven outline module parsing][69838]
463 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
468 These are still rejected semantically, so you will likely receive an error but
469 these changes can be seen and parsed by macros and conditional compilation.
473 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
474 Additionally when in incremental mode rustc defaults to 256 codegen units.
475 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
476 a panic is thrown.][67502]
477 - [Added tier 3\* support for the `aarch64-unknown-none` and
478 `aarch64-unknown-none-softfloat` targets.][68334]
479 - [Added tier 3 support for `arm64-apple-tvos` and
480 `x86_64-apple-tvos` targets.][68191]
485 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
486 `vec![]` to be able to be used in `const` contexts.
487 - [`convert::Infallible` now implements `Hash`.][70281]
488 - [`OsString` now implements `DerefMut` and `IndexMut` returning
489 a `&mut OsStr`.][70048]
490 - [Unicode 13 is now supported.][69929]
491 - [`String` now implements `From<&mut str>`.][69661]
492 - [`IoSlice` now implements `Copy`.][69403]
493 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
494 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
495 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
496 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
497 integer types.][69373]
501 - [`PathBuf::with_capacity`]
502 - [`PathBuf::capacity`]
504 - [`PathBuf::reserve`]
505 - [`PathBuf::reserve_exact`]
506 - [`PathBuf::shrink_to_fit`]
507 - [`f32::to_int_unchecked`]
508 - [`f64::to_int_unchecked`]
509 - [`Layout::align_to`]
510 - [`Layout::pad_to_align`]
516 - [Added the `cargo tree` command which will print a tree graph of
517 your dependencies.][cargo/8062] E.g.
519 mdbook v0.3.2 (/Users/src/rust/mdbook)
521 │ ├── html5ever v0.24.0
523 │ │ │ └── cfg-if v0.1.9
525 │ │ └── markup5ever v0.9.0
526 │ │ ├── log v0.4.8 (*)
528 │ │ │ └── phf_shared v0.7.24
529 │ │ │ ├── siphasher v0.2.3
530 │ │ │ └── unicase v1.4.2
531 │ │ │ [build-dependencies]
532 │ │ │ └── version_check v0.1.5
535 You can also display dependencies on multiple versions of the same crate with
536 `cargo tree -d` (short for `cargo tree --duplicates`).
540 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
541 the version in the sidebar.][69494]
545 - [Rustc now correctly generates static libraries on Windows GNU targets with
546 the `.a` extension, rather than the previous `.lib`.][70937]
547 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
548 - [The `file_name` property in JSON output of macro errors now points the actual
549 source file rather than the previous format of `<NAME macros>`.][70969]
550 **Note:** this may not point to a file that actually exists on the user's system.
551 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
552 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
553 not allow zero initialization such as `NonZeroU8`.][66059] This was
554 previously a warning.
555 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
556 operator has been defined as a saturating operation.][71269] This was previously
557 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
558 continue using the current behaviour, which may be desirable in rare performance
559 sensitive situations.
563 These changes provide no direct user facing benefits, but represent significant
564 improvements to the internals and overall performance of rustc and
567 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
568 - [Replace big JS dict with JSON parsing.][71250]
570 [69373]: https://github.com/rust-lang/rust/pull/69373/
571 [66059]: https://github.com/rust-lang/rust/pull/66059/
572 [68191]: https://github.com/rust-lang/rust/pull/68191/
573 [68899]: https://github.com/rust-lang/rust/pull/68899/
574 [71147]: https://github.com/rust-lang/rust/pull/71147/
575 [71250]: https://github.com/rust-lang/rust/pull/71250/
576 [70937]: https://github.com/rust-lang/rust/pull/70937/
577 [70969]: https://github.com/rust-lang/rust/pull/70969/
578 [70632]: https://github.com/rust-lang/rust/pull/70632/
579 [70281]: https://github.com/rust-lang/rust/pull/70281/
580 [70345]: https://github.com/rust-lang/rust/pull/70345/
581 [70048]: https://github.com/rust-lang/rust/pull/70048/
582 [70081]: https://github.com/rust-lang/rust/pull/70081/
583 [70156]: https://github.com/rust-lang/rust/pull/70156/
584 [71269]: https://github.com/rust-lang/rust/pull/71269/
585 [69838]: https://github.com/rust-lang/rust/pull/69838/
586 [69929]: https://github.com/rust-lang/rust/pull/69929/
587 [69661]: https://github.com/rust-lang/rust/pull/69661/
588 [69778]: https://github.com/rust-lang/rust/pull/69778/
589 [69494]: https://github.com/rust-lang/rust/pull/69494/
590 [69403]: https://github.com/rust-lang/rust/pull/69403/
591 [69033]: https://github.com/rust-lang/rust/pull/69033/
592 [68692]: https://github.com/rust-lang/rust/pull/68692/
593 [68334]: https://github.com/rust-lang/rust/pull/68334/
594 [67502]: https://github.com/rust-lang/rust/pull/67502/
595 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
596 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
597 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
598 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
599 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
600 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
601 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
602 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
603 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
604 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
605 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
606 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
607 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
610 Version 1.43.1 (2020-05-07)
611 ===========================
613 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
614 * [Fixed the stabilization of AVX-512 features.][71473]
615 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
617 [71430]: https://github.com/rust-lang/rust/pull/71430
618 [71473]: https://github.com/rust-lang/rust/issues/71473
619 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
622 Version 1.43.0 (2020-04-23)
623 ==========================
627 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
628 the type inferred correctly.][68129]
629 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
631 **Syntax only changes**
632 - [Allow `type Foo: Ord` syntactically.][69361]
633 - [Fuse associated and extern items up to defaultness.][69194]
634 - [Syntactically allow `self` in all `fn` contexts.][68764]
635 - [Merge `fn` syntax + cleanup item parsing.][68728]
636 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
637 For example, you may now write:
639 macro_rules! mac_trait {
649 These are still rejected *semantically*, so you will likely receive an error but
650 these changes can be seen and parsed by macros and
651 conditional compilation.
656 - [You can now pass multiple lint flags to rustc to override the previous
657 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
658 everything in the `unused` lint group except `unused-variables` which
659 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
660 everything in the `unused` lint group **including** `unused-variables` since
661 the allow flag is specified before the deny flag (and therefore overridden).
662 - [rustc will now prefer your system MinGW libraries over its bundled libraries
663 if they are available on `windows-gnu`.][67429]
664 - [rustc now buffers errors/warnings printed in JSON.][69227]
668 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
669 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
670 respectively.][69538] **Note** These conversions are only available when `N`
672 - [You can now use associated constants on floats and integers directly, rather
673 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
674 `f32::NAN` with no imports.
675 - [`u8::is_ascii` is now `const`.][68984]
676 - [`String` now implements `AsMut<str>`.][68742]
677 - [Added the `primitive` module to `std` and `core`.][67637] This module
678 reexports Rust's primitive types. This is mainly useful in macros
679 where you want avoid these types being shadowed.
680 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
681 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
685 - [`Once::is_completed`]
690 - [`iter::once_with`]
694 - [You can now set config `[profile]`s in your `.cargo/config`, or through
695 your environment.][cargo/7823]
696 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
697 executable path when running integration tests or benchmarks.][cargo/7697]
698 `<name>` is the name of your binary as-is e.g. If you wanted the executable
699 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
703 - [Certain checks in the `const_err` lint were deemed unrelated to const
704 evaluation][69185], and have been moved to the `unconditional_panic` and
705 `arithmetic_overflow` lints.
710 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
711 has been a warning since 1.36.0.
712 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
713 led to some instances being accepted, and now correctly emits a hard error.
715 [69340]: https://github.com/rust-lang/rust/pull/69340
719 These changes provide no direct user facing benefits, but represent significant
720 improvements to the internals and overall performance of `rustc` and
723 - [All components are now built with `opt-level=3` instead of `2`.][67878]
724 - [Improved how rustc generates drop code.][67332]
725 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
726 - [traits: preallocate 2 Vecs of known initial size][69022]
727 - [Avoid exponential behaviour when relating types][68772]
728 - [Skip `Drop` terminators for enum variants without drop glue][68943]
729 - [Improve performance of coherence checks][68966]
730 - [Deduplicate types in the generator witness][68672]
731 - [Invert control in struct_lint_level.][68725]
733 [67332]: https://github.com/rust-lang/rust/pull/67332/
734 [67429]: https://github.com/rust-lang/rust/pull/67429/
735 [67637]: https://github.com/rust-lang/rust/pull/67637/
736 [67642]: https://github.com/rust-lang/rust/pull/67642/
737 [67878]: https://github.com/rust-lang/rust/pull/67878/
738 [67885]: https://github.com/rust-lang/rust/pull/67885/
739 [68129]: https://github.com/rust-lang/rust/pull/68129/
740 [68672]: https://github.com/rust-lang/rust/pull/68672/
741 [68725]: https://github.com/rust-lang/rust/pull/68725/
742 [68728]: https://github.com/rust-lang/rust/pull/68728/
743 [68738]: https://github.com/rust-lang/rust/pull/68738/
744 [68742]: https://github.com/rust-lang/rust/pull/68742/
745 [68764]: https://github.com/rust-lang/rust/pull/68764/
746 [68772]: https://github.com/rust-lang/rust/pull/68772/
747 [68943]: https://github.com/rust-lang/rust/pull/68943/
748 [68952]: https://github.com/rust-lang/rust/pull/68952/
749 [68966]: https://github.com/rust-lang/rust/pull/68966/
750 [68984]: https://github.com/rust-lang/rust/pull/68984/
751 [69022]: https://github.com/rust-lang/rust/pull/69022/
752 [69185]: https://github.com/rust-lang/rust/pull/69185/
753 [69194]: https://github.com/rust-lang/rust/pull/69194/
754 [69201]: https://github.com/rust-lang/rust/pull/69201/
755 [69227]: https://github.com/rust-lang/rust/pull/69227/
756 [69548]: https://github.com/rust-lang/rust/pull/69548/
757 [69256]: https://github.com/rust-lang/rust/pull/69256/
758 [69361]: https://github.com/rust-lang/rust/pull/69361/
759 [69366]: https://github.com/rust-lang/rust/pull/69366/
760 [69538]: https://github.com/rust-lang/rust/pull/69538/
761 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
762 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
763 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
764 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
765 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
766 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
767 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
768 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
771 Version 1.42.0 (2020-03-12)
772 ==========================
776 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
778 fn foo(words: &[&str]) {
780 ["Hello", "World", "!", ..] => println!("Hello World!"),
781 ["Foo", "Bar", ..] => println!("Baz"),
782 rest => println!("{:?}", rest),
786 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
787 that you can create an enum that has the exact layout and ABI of the type
789 - [There are some *syntax-only* changes:][67131]
790 - `default` is syntactically allowed before items in `trait` definitions.
791 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
792 leave out their bodies in favor of `;`.
793 - Bounds on associated types in `impl`s are now syntactically allowed
794 (e.g. `type Foo: Ord;`).
795 - `...` (the C-variadic type) may occur syntactically directly as the type of
796 any function parameter.
798 These are still rejected *semantically*, so you will likely receive an error
799 but these changes can be seen and parsed by procedural macros and
800 conditional compilation.
804 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
805 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
806 - [`Option::{expect,unwrap}` and
807 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
808 pointing to the location where they were called, rather than
809 `core`'s internals. ][67887]
811 \* Refer to Rust's [platform support page][forge-platform-support] for more
812 information on Rust's tiered platform support.
816 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
817 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
818 to implement `Sized`.][67935]
819 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
820 - [`Layout::new` is now `const`.][66254]
821 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
826 - [`CondVar::wait_while`]
827 - [`CondVar::wait_timeout_while`]
829 - [`DebugMap::value`]
830 - [`ManuallyDrop::take`]
832 - [`ptr::slice_from_raw_parts_mut`]
833 - [`ptr::slice_from_raw_parts`]
837 - [You no longer need to include `extern crate proc_macro;` to be able to
838 `use proc_macro;` in the `2018` edition.][cargo/7700]
842 - [`Error::description` has been deprecated, and its use will now produce a
843 warning.][66919] It's recommended to use `Display`/`to_string` instead.
845 [68253]: https://github.com/rust-lang/rust/pull/68253/
846 [68348]: https://github.com/rust-lang/rust/pull/68348/
847 [67935]: https://github.com/rust-lang/rust/pull/67935/
848 [68339]: https://github.com/rust-lang/rust/pull/68339/
849 [68122]: https://github.com/rust-lang/rust/pull/68122/
850 [67712]: https://github.com/rust-lang/rust/pull/67712/
851 [67887]: https://github.com/rust-lang/rust/pull/67887/
852 [67131]: https://github.com/rust-lang/rust/pull/67131/
853 [67233]: https://github.com/rust-lang/rust/pull/67233/
854 [66899]: https://github.com/rust-lang/rust/pull/66899/
855 [66919]: https://github.com/rust-lang/rust/pull/66919/
856 [66254]: https://github.com/rust-lang/rust/pull/66254/
857 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
858 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
859 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
860 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
861 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
862 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
863 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
864 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
865 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
868 Version 1.41.1 (2020-02-27)
869 ===========================
871 * [Always check types of static items][69145]
872 * [Always check lifetime bounds of `Copy` impls][69145]
873 * [Fix miscompilation in callers of `Layout::repeat`][69225]
875 [69225]: https://github.com/rust-lang/rust/issues/69225
876 [69145]: https://github.com/rust-lang/rust/pull/69145
879 Version 1.41.0 (2020-01-30)
880 ===========================
885 - [You can now pass type parameters to foreign items when implementing
886 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
887 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
888 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
889 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
890 - [You can now use any valid identifier in a `format_args` macro.][66847]
891 Previously identifiers starting with an underscore were not allowed.
892 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
893 enum variants.][66183] These are still rejected semantically, but
894 can be seen and parsed by procedural macros and conditional compilation.
899 - [Rustc will now warn if you have unused loop `'label`s.][66325]
900 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
901 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
902 - [You can now pass an arguments file passing the `@path` syntax
903 to rustc.][66172] Note that the format differs somewhat from what is
904 found in other tooling; please see [the documentation][argfile-docs] for
906 - [You can now provide `--extern` flag without a path, indicating that it is
907 available from the search path or specified with an `-L` flag.][64882]
909 \* Refer to Rust's [platform support page][forge-platform-support] for more
910 information on Rust's tiered platform support.
912 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
917 - [The `core::panic` module is now stable.][66771] It was already stable
919 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
920 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
921 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
927 - [`Result::map_or_else`]
928 - [`std::rc::Weak::weak_count`]
929 - [`std::rc::Weak::strong_count`]
930 - [`std::sync::Weak::weak_count`]
931 - [`std::sync::Weak::strong_count`]
936 - [Cargo will now document all the private items for binary crates
937 by default.][cargo/7593]
938 - [`cargo-install` will now reinstall the package if it detects that it is out
939 of date.][cargo/7560]
940 - [Cargo.lock now uses a more git friendly format that should help to reduce
941 merge conflicts.][cargo/7579]
942 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
943 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
944 optimisation level to `2` for debug builds. You can also use
945 `[profile.<profile>.build-override]` to override build scripts and
951 - [You can now specify `edition` in documentation code blocks to compile the block
952 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
953 should be compiled the 2018 edition of Rust.
954 - [You can now provide custom themes to rustdoc with `--theme`, and check the
955 current theme with `--check-theme`.][54733]
956 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
961 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
962 Apple targets.][apple-32bit-drop] This means that the source code is still
963 available to build, but the targets are no longer being tested and release
964 binaries for those platforms will no longer be distributed by the Rust project.
965 Please refer to the linked blog post for more information.
967 [54733]: https://github.com/rust-lang/rust/pull/54733/
968 [61351]: https://github.com/rust-lang/rust/pull/61351/
969 [67255]: https://github.com/rust-lang/rust/pull/67255/
970 [66661]: https://github.com/rust-lang/rust/pull/66661/
971 [66771]: https://github.com/rust-lang/rust/pull/66771/
972 [66847]: https://github.com/rust-lang/rust/pull/66847/
973 [66238]: https://github.com/rust-lang/rust/pull/66238/
974 [66277]: https://github.com/rust-lang/rust/pull/66277/
975 [66325]: https://github.com/rust-lang/rust/pull/66325/
976 [66172]: https://github.com/rust-lang/rust/pull/66172/
977 [66183]: https://github.com/rust-lang/rust/pull/66183/
978 [65879]: https://github.com/rust-lang/rust/pull/65879/
979 [65013]: https://github.com/rust-lang/rust/pull/65013/
980 [64882]: https://github.com/rust-lang/rust/pull/64882/
981 [64325]: https://github.com/rust-lang/rust/pull/64325/
982 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
983 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
984 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
985 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
986 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
987 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
988 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
989 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
990 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
991 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
992 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
994 Version 1.40.0 (2019-12-19)
995 ===========================
999 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1000 `const` contexts.][65188] e.g.
1003 pub struct Point(i32, i32);
1005 const ORIGIN: Point = {
1006 let constructor = Point;
1012 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1013 indicate that there may be variants or fields added in the future.][64639]
1014 For example this requires adding a wild-card branch (`_ => {}`) to any match
1015 statements on a non-exhaustive `enum`. [(RFC 2008)]
1016 - [You can now use function-like procedural macros in `extern` blocks and in
1017 type positions.][63931] e.g. `type Generated = macro!();`
1018 - [Function-like and attribute procedural macros can now emit
1019 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1020 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1021 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1022 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1026 - [Added tier 3 support\* for the
1027 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1028 - [Added tier 3 support for the
1029 `aarch64-unknown-none-softfloat` target.][64589]
1030 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1031 `mips64el-unknown-linux-muslabi64` targets.][65843]
1033 \* Refer to Rust's [platform support page][forge-platform-support] for more
1034 information on Rust's tiered platform support.
1038 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1042 - [`BTreeMap::get_key_value`]
1043 - [`HashMap::get_key_value`]
1044 - [`Option::as_deref_mut`]
1045 - [`Option::as_deref`]
1046 - [`Option::flatten`]
1047 - [`UdpSocket::peer_addr`]
1048 - [`f32::to_be_bytes`]
1049 - [`f32::to_le_bytes`]
1050 - [`f32::to_ne_bytes`]
1051 - [`f64::to_be_bytes`]
1052 - [`f64::to_le_bytes`]
1053 - [`f64::to_ne_bytes`]
1054 - [`f32::from_be_bytes`]
1055 - [`f32::from_le_bytes`]
1056 - [`f32::from_ne_bytes`]
1057 - [`f64::from_be_bytes`]
1058 - [`f64::from_le_bytes`]
1059 - [`f64::from_ne_bytes`]
1066 - [Cargo will now always display warnings, rather than only on
1067 fresh builds.][cargo/7450]
1068 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1069 now produce an error.][cargo/7507] Previously these flags were ignored.
1070 - [You can now publish `dev-dependencies` without including
1071 a `version`.][cargo/7333]
1075 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1076 when running documentation tests with `rustdoc`.][63803]
1080 - [As previously announced, any previous NLL warnings in the 2015 edition are
1081 now hard errors.][64221]
1082 - [The `include!` macro will now warn if it failed to include the
1083 entire file.][64284] The `include!` macro unintentionally only includes the
1084 first _expression_ in a file, and this can be unintuitive. This will become
1085 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1086 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1087 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1088 or `extern` blocks now correctly emits a hard error.
1090 [65294]: https://github.com/rust-lang/rust/pull/65294/
1091 [66103]: https://github.com/rust-lang/rust/pull/66103/
1092 [65843]: https://github.com/rust-lang/rust/pull/65843/
1093 [65188]: https://github.com/rust-lang/rust/pull/65188/
1094 [65092]: https://github.com/rust-lang/rust/pull/65092/
1095 [64589]: https://github.com/rust-lang/rust/pull/64589/
1096 [64639]: https://github.com/rust-lang/rust/pull/64639/
1097 [64221]: https://github.com/rust-lang/rust/pull/64221/
1098 [64284]: https://github.com/rust-lang/rust/pull/64284/
1099 [63931]: https://github.com/rust-lang/rust/pull/63931/
1100 [64035]: https://github.com/rust-lang/rust/pull/64035/
1101 [63674]: https://github.com/rust-lang/rust/pull/63674/
1102 [63803]: https://github.com/rust-lang/rust/pull/63803/
1103 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1104 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1105 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1106 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1107 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1108 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1109 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1110 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1111 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1112 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1113 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1114 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1115 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1116 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1117 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1118 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1119 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1120 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1121 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1122 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1123 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1124 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1125 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1126 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1127 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1128 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1131 Version 1.39.0 (2019-11-07)
1132 ===========================
1136 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1137 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1138 - [You can now use certain attributes on function, closure, and function pointer
1139 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1140 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1141 attributes applied to items. e.g.
1144 #[cfg(windows)] slice: &[u16],
1145 #[cfg(not(windows))] slice: &[u8],
1150 - [You can now take shared references to bind-by-move patterns in the `if` guards
1151 of `match` arms.][63118] e.g.
1154 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1158 // ---- `nums` is bound by move.
1159 if nums.iter().sum::<u8>() == 10
1160 // ^------ `.iter()` implicitly takes a reference to `nums`.
1163 // ----------- Legal as `nums` was bound by move and so we have ownership.
1165 _ => unreachable!(),
1174 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1175 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1176 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1177 **Note** Cargo currently doesn't use this feature. Refer to
1178 [cargo#7315][cargo/7315] to track this feature's progress.
1179 - [You can now pass `--show-output` argument to test binaries to print the
1180 output of successful tests.][62600]
1183 \* Refer to Rust's [platform support page][forge-platform-support] for more
1184 information on Rust's tiered platform support.
1188 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1189 - [`LinkedList::new` is now a `const` function.][63684]
1190 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1191 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1192 now `const`.][63786]
1196 - [`Pin::into_inner`]
1197 - [`Instant::checked_duration_since`]
1198 - [`Instant::saturating_duration_since`]
1202 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1203 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1204 `--all` is now deprecated.
1208 - [You can now pass `-Clinker` to rustdoc to control the linker used
1209 for compiling doctests.][63834]
1213 - [Code that was previously accepted by the old borrow checker, but rejected by
1214 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1215 previously a warning, and will also become a hard error in the Rust 2015
1216 edition in the 1.40.0 release.
1217 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1218 run tests.][63827] This should improve performance when running a large
1220 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1221 recommended to use the `?` operator instead.
1222 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1225 [62600]: https://github.com/rust-lang/rust/pull/62600/
1226 [62672]: https://github.com/rust-lang/rust/pull/62672/
1227 [63118]: https://github.com/rust-lang/rust/pull/63118/
1228 [63209]: https://github.com/rust-lang/rust/pull/63209/
1229 [63402]: https://github.com/rust-lang/rust/pull/63402/
1230 [63565]: https://github.com/rust-lang/rust/pull/63565/
1231 [63595]: https://github.com/rust-lang/rust/pull/63595/
1232 [63684]: https://github.com/rust-lang/rust/pull/63684/
1233 [63698]: https://github.com/rust-lang/rust/pull/63698/
1234 [63770]: https://github.com/rust-lang/rust/pull/63770/
1235 [63786]: https://github.com/rust-lang/rust/pull/63786/
1236 [63827]: https://github.com/rust-lang/rust/pull/63827/
1237 [63834]: https://github.com/rust-lang/rust/pull/63834/
1238 [63927]: https://github.com/rust-lang/rust/pull/63927/
1239 [63933]: https://github.com/rust-lang/rust/pull/63933/
1240 [63934]: https://github.com/rust-lang/rust/pull/63934/
1241 [63938]: https://github.com/rust-lang/rust/pull/63938/
1242 [63940]: https://github.com/rust-lang/rust/pull/63940/
1243 [63941]: https://github.com/rust-lang/rust/pull/63941/
1244 [63945]: https://github.com/rust-lang/rust/pull/63945/
1245 [64010]: https://github.com/rust-lang/rust/pull/64010/
1246 [64028]: https://github.com/rust-lang/rust/pull/64028/
1247 [64334]: https://github.com/rust-lang/rust/pull/64334/
1248 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1249 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1250 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1251 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1252 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1253 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1255 Version 1.38.0 (2019-09-26)
1256 ==========================
1260 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1261 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1265 - [Added pipelined compilation support to `rustc`.][62766] This will
1266 improve compilation times in some cases. For further information please refer
1267 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1268 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1269 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1270 `x86_64-uwp-windows-msvc` targets.][60260]
1271 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1272 `armv7-unknown-linux-musleabi` targets.][63107]
1273 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1274 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1275 - [Upgraded to LLVM 9.][62592]
1277 \* Refer to Rust's [platform support page][forge-platform-support] for more
1278 information on Rust's tiered platform support.
1282 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1283 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1284 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1285 is available at `std::clone::Clone`). This also makes all built-in macros
1286 available in `std`/`core` root. e.g. `std::include_bytes!`.
1287 - [`str::Chars` now implements `Debug`.][63000]
1288 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1289 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1290 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1291 - [Added euclidean remainder and division operations (`div_euclid`,
1292 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1293 `overflowing`, and `wrapping` versions are available for all
1295 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1296 `PartialEq`.][61491]
1297 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1301 - [`<*const T>::cast`]
1302 - [`<*mut T>::cast`]
1303 - [`Duration::as_secs_f32`]
1304 - [`Duration::as_secs_f64`]
1305 - [`Duration::div_f32`]
1306 - [`Duration::div_f64`]
1307 - [`Duration::from_secs_f32`]
1308 - [`Duration::from_secs_f64`]
1309 - [`Duration::mul_f32`]
1310 - [`Duration::mul_f64`]
1311 - [`any::type_name`]
1315 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1316 - [You can now pass the `--features` option multiple times to enable
1317 multiple features.][cargo/7084]
1321 - [`rustc` will now warn about some incorrect uses of
1322 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1326 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1328 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1329 issues][62896] with certain crates such as libc.
1331 [60260]: https://github.com/rust-lang/rust/pull/60260/
1332 [61457]: https://github.com/rust-lang/rust/pull/61457/
1333 [61491]: https://github.com/rust-lang/rust/pull/61491/
1334 [61884]: https://github.com/rust-lang/rust/pull/61884/
1335 [61953]: https://github.com/rust-lang/rust/pull/61953/
1336 [62042]: https://github.com/rust-lang/rust/pull/62042/
1337 [62528]: https://github.com/rust-lang/rust/pull/62528/
1338 [62583]: https://github.com/rust-lang/rust/pull/62583/
1339 [62735]: https://github.com/rust-lang/rust/pull/62735/
1340 [62766]: https://github.com/rust-lang/rust/pull/62766/
1341 [62784]: https://github.com/rust-lang/rust/pull/62784/
1342 [62592]: https://github.com/rust-lang/rust/pull/62592/
1343 [62785]: https://github.com/rust-lang/rust/issues/62785/
1344 [62814]: https://github.com/rust-lang/rust/pull/62814/
1345 [62896]: https://github.com/rust-lang/rust/issues/62896/
1346 [63000]: https://github.com/rust-lang/rust/pull/63000/
1347 [63056]: https://github.com/rust-lang/rust/pull/63056/
1348 [63107]: https://github.com/rust-lang/rust/pull/63107/
1349 [63346]: https://github.com/rust-lang/rust/pull/63346/
1350 [63421]: https://github.com/rust-lang/rust/pull/63421/
1351 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1352 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1353 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1354 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1355 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1356 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1357 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1358 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1359 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1360 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1361 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1362 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1363 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1364 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1365 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1367 Version 1.37.0 (2019-08-15)
1368 ==========================
1372 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1373 [`Box`][62228], or an [array][62235] and unused.
1374 - [You can now use the `cfg` and `cfg_attr` attributes on
1375 generic parameters.][61547]
1376 - [You can now use enum variants through type alias.][61682] e.g. You can
1377 write the following:
1379 type MyOption = Option<u8>;
1381 fn increment_or_zero(x: MyOption) -> u8 {
1383 MyOption::Some(y) => y + 1,
1384 MyOption::None => 0,
1388 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1389 `const _: u32 = 5;`.
1390 - [You can now use `#[repr(align(X)]` on enums.][61229]
1391 - [The `?` Kleene macro operator is now available in the
1392 2015 edition.][60932]
1396 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1397 and `-C profile-use` flags.][61268] For more information on how to use profile
1398 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1399 - [The `rust-lldb` wrapper script should now work again.][61827]
1403 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1407 - [`BufReader::buffer`]
1408 - [`BufWriter::buffer`]
1409 - [`Cell::from_mut`]
1410 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1411 - [`DoubleEndedIterator::nth_back`]
1413 - [`Wrapping::reverse_bits`]
1414 - [`i128::reverse_bits`]
1415 - [`i16::reverse_bits`]
1416 - [`i32::reverse_bits`]
1417 - [`i64::reverse_bits`]
1418 - [`i8::reverse_bits`]
1419 - [`isize::reverse_bits`]
1420 - [`slice::copy_within`]
1421 - [`u128::reverse_bits`]
1422 - [`u16::reverse_bits`]
1423 - [`u32::reverse_bits`]
1424 - [`u64::reverse_bits`]
1425 - [`u8::reverse_bits`]
1426 - [`usize::reverse_bits`]
1430 - [`Cargo.lock` files are now included by default when publishing executable crates
1431 with executables.][cargo/7026]
1432 - [You can now specify `default-run="foo"` in `[package]` to specify the
1433 default executable to use for `cargo run`.][cargo/7056]
1440 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1441 Please transition your code to using the `..=` syntax for inclusive
1443 - [Using a trait object without the `dyn` will now warn by default.][61203]
1444 Please transition your code to use `dyn Trait` for trait objects instead.
1446 [62228]: https://github.com/rust-lang/rust/pull/62228/
1447 [62235]: https://github.com/rust-lang/rust/pull/62235/
1448 [61802]: https://github.com/rust-lang/rust/pull/61802/
1449 [61827]: https://github.com/rust-lang/rust/pull/61827/
1450 [61547]: https://github.com/rust-lang/rust/pull/61547/
1451 [61682]: https://github.com/rust-lang/rust/pull/61682/
1452 [61268]: https://github.com/rust-lang/rust/pull/61268/
1453 [61342]: https://github.com/rust-lang/rust/pull/61342/
1454 [61347]: https://github.com/rust-lang/rust/pull/61347/
1455 [61100]: https://github.com/rust-lang/rust/pull/61100/
1456 [61203]: https://github.com/rust-lang/rust/pull/61203/
1457 [61229]: https://github.com/rust-lang/rust/pull/61229/
1458 [60932]: https://github.com/rust-lang/rust/pull/60932/
1459 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1460 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1461 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1462 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1463 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1464 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1465 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1466 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1467 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1468 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1469 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1470 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1471 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1472 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1473 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1474 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1475 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1476 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1477 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1478 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1479 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1480 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1481 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1482 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1485 Version 1.36.0 (2019-07-04)
1486 ==========================
1490 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1491 - [The order of traits in trait objects no longer affects the semantics of that
1492 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1493 `dyn fmt::Debug + Send`, where this was previously not the case.
1497 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1498 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1499 - [`mem::needs_drop` is now available as a const fn.][60364]
1500 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1501 - [`String` now implements `BorrowMut<str>`.][60404]
1502 - [`io::Cursor` now implements `Default`.][60234]
1503 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1504 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1505 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1506 environment has access to heap memory allocation.
1507 - [`String` now implements `From<&String>`.][59825]
1508 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1509 return a tuple of each argument when there is multiple arguments.
1510 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1515 - [`VecDeque::rotate_left`]
1516 - [`VecDeque::rotate_right`]
1517 - [`Iterator::copied`]
1519 - [`io::IoSliceMut`]
1520 - [`Read::read_vectored`]
1521 - [`Write::write_vectored`]
1522 - [`str::as_mut_ptr`]
1523 - [`mem::MaybeUninit`]
1524 - [`pointer::align_offset`]
1525 - [`future::Future`]
1527 - [`task::RawWaker`]
1528 - [`task::RawWakerVTable`]
1534 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1535 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1537 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1541 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1548 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1549 longer recommended, and will be deprecated in 1.39.0.
1551 [60318]: https://github.com/rust-lang/rust/pull/60318/
1552 [60364]: https://github.com/rust-lang/rust/pull/60364/
1553 [60370]: https://github.com/rust-lang/rust/pull/60370/
1554 [60404]: https://github.com/rust-lang/rust/pull/60404/
1555 [60234]: https://github.com/rust-lang/rust/pull/60234/
1556 [60244]: https://github.com/rust-lang/rust/pull/60244/
1557 [58623]: https://github.com/rust-lang/rust/pull/58623/
1558 [59648]: https://github.com/rust-lang/rust/pull/59648/
1559 [59675]: https://github.com/rust-lang/rust/pull/59675/
1560 [59825]: https://github.com/rust-lang/rust/pull/59825/
1561 [59826]: https://github.com/rust-lang/rust/pull/59826/
1562 [59445]: https://github.com/rust-lang/rust/pull/59445/
1563 [59114]: https://github.com/rust-lang/rust/pull/59114/
1564 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1565 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1566 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1567 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1568 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1569 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1570 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1571 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1572 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1573 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1574 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1575 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1576 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1577 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1578 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1579 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1580 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1581 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1582 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1583 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1586 Version 1.35.0 (2019-05-23)
1587 ==========================
1591 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1592 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1593 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1595 unsafe fn call_unsafe(func: unsafe fn()) {
1600 unsafe { call_unsafe(|| {}); }
1607 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1608 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1609 - [Added the `wasm32-unknown-wasi` target.][59464]
1614 - [`Thread` will now show its ID in `Debug` output.][59460]
1615 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1616 - [`alloc::System` now implements `Default`.][59451]
1617 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1619 - [`char::{ToLowercase, ToUppercase}` now
1620 implement `ExactSizeIterator`.][58778]
1621 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1622 - [Removed the `Read` trait bounds
1623 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1624 - [You can now call the `dbg!` macro without any parameters to print the file
1625 and line where it is called.][57847]
1626 - [In place ASCII case conversions are now up to 4× faster.][59283]
1627 e.g. `str::make_ascii_lowercase`
1628 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1635 - [`RefCell::replace_with`]
1636 - [`RefCell::map_split`]
1638 - [`Range::contains`]
1639 - [`RangeFrom::contains`]
1640 - [`RangeTo::contains`]
1641 - [`RangeInclusive::contains`]
1642 - [`RangeToInclusive::contains`]
1643 - [`Option::copied`]
1647 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1648 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1653 - [The Rust toolchain is now available natively for musl based distros.][58575]
1655 [59460]: https://github.com/rust-lang/rust/pull/59460/
1656 [59464]: https://github.com/rust-lang/rust/pull/59464/
1657 [59500]: https://github.com/rust-lang/rust/pull/59500/
1658 [59512]: https://github.com/rust-lang/rust/pull/59512/
1659 [59580]: https://github.com/rust-lang/rust/pull/59580/
1660 [59283]: https://github.com/rust-lang/rust/pull/59283/
1661 [59451]: https://github.com/rust-lang/rust/pull/59451/
1662 [59076]: https://github.com/rust-lang/rust/pull/59076/
1663 [58778]: https://github.com/rust-lang/rust/pull/58778/
1664 [58717]: https://github.com/rust-lang/rust/pull/58717/
1665 [58369]: https://github.com/rust-lang/rust/pull/58369/
1666 [58423]: https://github.com/rust-lang/rust/pull/58423/
1667 [58080]: https://github.com/rust-lang/rust/pull/58080/
1668 [57847]: https://github.com/rust-lang/rust/pull/57847/
1669 [58575]: https://github.com/rust-lang/rust/pull/58575
1670 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1671 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1672 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1673 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1674 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1675 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1676 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1677 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1678 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1679 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1680 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1681 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1683 Version 1.34.2 (2019-05-14)
1684 ===========================
1686 * [Destabilize the `Error::type_id` function due to a security
1687 vulnerability][60785] ([CVE-2019-12083])
1689 [60785]: https://github.com/rust-lang/rust/pull/60785
1690 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1692 Version 1.34.1 (2019-04-25)
1693 ===========================
1695 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1696 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1697 * [Fix Clippy panic when checking some macros][clippy/3805]
1699 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1700 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1701 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1703 Version 1.34.0 (2019-04-11)
1704 ==========================
1708 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1709 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1711 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1712 `#[attr{}]` procedural macros.][57367]
1713 - [You can now write `extern crate self as foo;`][57407] to import your
1714 crate's root into the extern prelude.
1719 - [You can now target `riscv64imac-unknown-none-elf` and
1720 `riscv64gc-unknown-none-elf`.][58406]
1721 - [You can now enable linker plugin LTO optimisations with
1722 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1723 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1725 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1730 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1731 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1732 the `Hash` trait to create an iterator.
1733 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1734 methods.][58421] Most notably you no longer require the `Ord` trait to create
1736 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1737 for all numeric types.][58044]
1738 - [Indexing a `str` is now generic over all types that
1739 implement `SliceIndex<str>`.][57604]
1740 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1741 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1742 produce a warning if their returning type is unused.
1743 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1744 `overflowing_pow` are now available for all numeric types.][57873] These are
1745 equivalent to methods such as `wrapping_add` for the `pow` operation.
1753 * [`Error::type_id`]
1754 * [`atomic::AtomicI16`]
1755 * [`atomic::AtomicI32`]
1756 * [`atomic::AtomicI64`]
1757 * [`atomic::AtomicI8`]
1758 * [`atomic::AtomicU16`]
1759 * [`atomic::AtomicU32`]
1760 * [`atomic::AtomicU64`]
1761 * [`atomic::AtomicU8`]
1762 * [`convert::Infallible`]
1763 * [`convert::TryFrom`]
1764 * [`convert::TryInto`]
1766 * [`iter::successors`]
1767 * [`num::NonZeroI128`]
1768 * [`num::NonZeroI16`]
1769 * [`num::NonZeroI32`]
1770 * [`num::NonZeroI64`]
1771 * [`num::NonZeroI8`]
1772 * [`num::NonZeroIsize`]
1773 * [`slice::sort_by_cached_key`]
1774 * [`str::escape_debug`]
1775 * [`str::escape_default`]
1776 * [`str::escape_unicode`]
1777 * [`str::split_ascii_whitespace`]
1780 * [`Instant::checked_add`]
1781 * [`Instant::checked_sub`]
1782 * [`SystemTime::checked_add`]
1783 * [`SystemTime::checked_sub`]
1787 - [You can now use alternative registries to crates.io.][cargo/6654]
1791 - [You can now use the `?` operator in your documentation tests without manually
1792 adding `fn main() -> Result<(), _> {}`.][56470]
1796 - [`Command::before_exec` is being replaced by the unsafe method
1797 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1798 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1799 can now use `const` functions in `static` variables.
1801 [58370]: https://github.com/rust-lang/rust/pull/58370/
1802 [58406]: https://github.com/rust-lang/rust/pull/58406/
1803 [58421]: https://github.com/rust-lang/rust/pull/58421/
1804 [58166]: https://github.com/rust-lang/rust/pull/58166/
1805 [58044]: https://github.com/rust-lang/rust/pull/58044/
1806 [58057]: https://github.com/rust-lang/rust/pull/58057/
1807 [58059]: https://github.com/rust-lang/rust/pull/58059/
1808 [57809]: https://github.com/rust-lang/rust/pull/57809/
1809 [57873]: https://github.com/rust-lang/rust/pull/57873/
1810 [57604]: https://github.com/rust-lang/rust/pull/57604/
1811 [57367]: https://github.com/rust-lang/rust/pull/57367/
1812 [57407]: https://github.com/rust-lang/rust/pull/57407/
1813 [57425]: https://github.com/rust-lang/rust/pull/57425/
1814 [57106]: https://github.com/rust-lang/rust/pull/57106/
1815 [56470]: https://github.com/rust-lang/rust/pull/56470/
1816 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1817 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1818 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1819 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1820 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1821 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1822 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1823 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1824 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1825 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1826 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1827 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1828 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1829 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1830 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1831 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1832 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1833 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1834 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1835 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1836 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1837 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1838 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1839 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1840 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1841 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1842 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1843 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1844 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1845 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1846 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1849 Version 1.33.0 (2019-02-28)
1850 ==========================
1854 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1855 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1856 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1857 E.g. You can have match statement on a `u8` that covers `0..=255` and
1858 you would no longer be required to have a `_ => unreachable!()` case.
1859 - [You can now have multiple patterns in `if let` and `while let`
1860 expressions.][57532] You can do this with the same syntax as a `match`
1870 let state = Creature::Crab("Ferris");
1872 if let Creature::Crab(name) | Creature::Person(name) = state {
1873 println!("This creature's name is: {}", name);
1877 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1878 this feature will by default produce a warning as this behaviour can be
1879 unintuitive. E.g. `if let _ = 5 {}`
1880 - [You can now use `let` bindings, assignments, expression statements,
1881 and irrefutable pattern destructuring in const functions.][57175]
1882 - [You can now call unsafe const functions.][57067] E.g.
1884 const unsafe fn foo() -> i32 { 5 }
1885 const fn bar() -> i32 {
1889 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1890 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1891 - [You can now specify a specific alignment with the `#[repr(packed)]`
1892 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1893 with an alignment of 2 bytes and a size of 6 bytes.
1894 - [You can now import an item from a module as an `_`.][56303] This allows you to
1895 import a trait's impls, and not have the name in the namespace. E.g.
1897 use std::io::Read as _;
1899 // Allowed as there is only one `Read` in the module.
1902 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1906 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1907 command line argument.][56351]
1908 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1909 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1910 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1911 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1912 information on Rust's platform support.
1913 - [Added support for the `thumbv7neon-linux-androideabi` and
1914 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1915 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1919 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1920 functions for all numeric types.][57566]
1921 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1922 are now `const` functions for all numeric types.][57105]
1923 - [The methods `is_positive` and `is_negative` are now `const` functions for
1924 all signed numeric types.][57105]
1925 - [The `get` method for all `NonZero` types is now `const`.][57167]
1926 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1927 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1928 numeric types.][57234]
1929 - [`Ipv4Addr::new` is now a `const` function][57234]
1933 - [`unix::FileExt::read_exact_at`]
1934 - [`unix::FileExt::write_all_at`]
1935 - [`Option::transpose`]
1936 - [`Result::transpose`]
1937 - [`convert::identity`]
1940 - [`marker::PhantomPinned`]
1941 - [`Vec::resize_with`]
1942 - [`VecDeque::resize_with`]
1943 - [`Duration::as_millis`]
1944 - [`Duration::as_micros`]
1945 - [`Duration::as_nanos`]
1950 - [You can now publish crates that require a feature flag to compile with
1951 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1952 - [Cargo should now rebuild a crate if a file was modified during the initial
1957 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1958 are now deprecated in the standard library, and their usage will now produce a warning.
1959 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1961 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1963 - [Libtest no longer creates a new thread for each test when
1964 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1966 [55982]: https://github.com/rust-lang/rust/pull/55982/
1967 [56243]: https://github.com/rust-lang/rust/pull/56243
1968 [56303]: https://github.com/rust-lang/rust/pull/56303/
1969 [56351]: https://github.com/rust-lang/rust/pull/56351/
1970 [56362]: https://github.com/rust-lang/rust/pull/56362
1971 [56642]: https://github.com/rust-lang/rust/pull/56642/
1972 [56769]: https://github.com/rust-lang/rust/pull/56769/
1973 [56805]: https://github.com/rust-lang/rust/pull/56805
1974 [56947]: https://github.com/rust-lang/rust/pull/56947/
1975 [57049]: https://github.com/rust-lang/rust/pull/57049/
1976 [57067]: https://github.com/rust-lang/rust/pull/57067/
1977 [57105]: https://github.com/rust-lang/rust/pull/57105
1978 [57130]: https://github.com/rust-lang/rust/pull/57130/
1979 [57167]: https://github.com/rust-lang/rust/pull/57167/
1980 [57175]: https://github.com/rust-lang/rust/pull/57175/
1981 [57234]: https://github.com/rust-lang/rust/pull/57234/
1982 [57332]: https://github.com/rust-lang/rust/pull/57332/
1983 [57465]: https://github.com/rust-lang/rust/pull/57465/
1984 [57532]: https://github.com/rust-lang/rust/pull/57532/
1985 [57535]: https://github.com/rust-lang/rust/pull/57535/
1986 [57566]: https://github.com/rust-lang/rust/pull/57566/
1987 [57615]: https://github.com/rust-lang/rust/pull/57615/
1988 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1989 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1990 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1991 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1992 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1993 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1994 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1995 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1996 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1997 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1998 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1999 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2000 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2001 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2002 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2003 [platform-support]: https://forge.rust-lang.org/platform-support.html
2005 Version 1.32.0 (2019-01-17)
2006 ==========================
2011 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2012 operator allows you to specify zero or one repetitions similar to the `*` and
2014 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2015 now always resolve to the item (`enum`, `struct`, etc.) available in the
2016 module if present, before resolving to a external crate or an item the prelude.][56759]
2019 enum Color { Red, Green, Blue }
2025 - [You can now match against `PhantomData<T>` types.][55837]
2026 - [You can now match against literals in macros with the `literal`
2027 specifier.][56072] This will match against a literal of any type.
2028 E.g. `1`, `'A'`, `"Hello World"`
2029 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2031 struct Point(i32, i32);
2034 pub fn new(x: i32, y: i32) -> Self {
2038 pub fn is_origin(&self) -> bool {
2046 - [Self can also now be used in type definitions.][56366] E.g.
2050 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2053 Cons(T, Box<Self>) // likewise here
2056 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2057 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2061 - [The default allocator has changed from jemalloc to the default allocator on
2062 your system.][55238] The compiler itself on Linux & macOS will still use
2063 jemalloc, but programs compiled with it will use the system allocator.
2064 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2068 - [`PathBuf` now implements `FromStr`.][55148]
2069 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2070 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2071 easily debug expressions in your rust program. E.g.
2074 let b = dbg!(a * 2) + 1;
2075 // ^-- prints: [src/main.rs:4] a * 2 = 4
2079 The following APIs are now `const` functions and can be used in a
2083 - [`UnsafeCell::get`]
2084 - [`char::is_ascii`]
2086 - [`ManuallyDrop::new`]
2087 - [`ManuallyDrop::into_inner`]
2088 - [`RangeInclusive::start`]
2089 - [`RangeInclusive::end`]
2090 - [`NonNull::as_ptr`]
2093 - [`Duration::as_secs`]
2094 - [`Duration::subsec_millis`]
2095 - [`Duration::subsec_micros`]
2096 - [`Duration::subsec_nanos`]
2098 - [`Ipv4Addr::is_unspecified`]
2100 - [`Ipv6Addr::octets`]
2104 - [`i8::to_be_bytes`]
2105 - [`i8::to_le_bytes`]
2106 - [`i8::to_ne_bytes`]
2107 - [`i8::from_be_bytes`]
2108 - [`i8::from_le_bytes`]
2109 - [`i8::from_ne_bytes`]
2110 - [`i16::to_be_bytes`]
2111 - [`i16::to_le_bytes`]
2112 - [`i16::to_ne_bytes`]
2113 - [`i16::from_be_bytes`]
2114 - [`i16::from_le_bytes`]
2115 - [`i16::from_ne_bytes`]
2116 - [`i32::to_be_bytes`]
2117 - [`i32::to_le_bytes`]
2118 - [`i32::to_ne_bytes`]
2119 - [`i32::from_be_bytes`]
2120 - [`i32::from_le_bytes`]
2121 - [`i32::from_ne_bytes`]
2122 - [`i64::to_be_bytes`]
2123 - [`i64::to_le_bytes`]
2124 - [`i64::to_ne_bytes`]
2125 - [`i64::from_be_bytes`]
2126 - [`i64::from_le_bytes`]
2127 - [`i64::from_ne_bytes`]
2128 - [`i128::to_be_bytes`]
2129 - [`i128::to_le_bytes`]
2130 - [`i128::to_ne_bytes`]
2131 - [`i128::from_be_bytes`]
2132 - [`i128::from_le_bytes`]
2133 - [`i128::from_ne_bytes`]
2134 - [`isize::to_be_bytes`]
2135 - [`isize::to_le_bytes`]
2136 - [`isize::to_ne_bytes`]
2137 - [`isize::from_be_bytes`]
2138 - [`isize::from_le_bytes`]
2139 - [`isize::from_ne_bytes`]
2140 - [`u8::to_be_bytes`]
2141 - [`u8::to_le_bytes`]
2142 - [`u8::to_ne_bytes`]
2143 - [`u8::from_be_bytes`]
2144 - [`u8::from_le_bytes`]
2145 - [`u8::from_ne_bytes`]
2146 - [`u16::to_be_bytes`]
2147 - [`u16::to_le_bytes`]
2148 - [`u16::to_ne_bytes`]
2149 - [`u16::from_be_bytes`]
2150 - [`u16::from_le_bytes`]
2151 - [`u16::from_ne_bytes`]
2152 - [`u32::to_be_bytes`]
2153 - [`u32::to_le_bytes`]
2154 - [`u32::to_ne_bytes`]
2155 - [`u32::from_be_bytes`]
2156 - [`u32::from_le_bytes`]
2157 - [`u32::from_ne_bytes`]
2158 - [`u64::to_be_bytes`]
2159 - [`u64::to_le_bytes`]
2160 - [`u64::to_ne_bytes`]
2161 - [`u64::from_be_bytes`]
2162 - [`u64::from_le_bytes`]
2163 - [`u64::from_ne_bytes`]
2164 - [`u128::to_be_bytes`]
2165 - [`u128::to_le_bytes`]
2166 - [`u128::to_ne_bytes`]
2167 - [`u128::from_be_bytes`]
2168 - [`u128::from_le_bytes`]
2169 - [`u128::from_ne_bytes`]
2170 - [`usize::to_be_bytes`]
2171 - [`usize::to_le_bytes`]
2172 - [`usize::to_ne_bytes`]
2173 - [`usize::from_be_bytes`]
2174 - [`usize::from_le_bytes`]
2175 - [`usize::from_ne_bytes`]
2179 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2180 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2184 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2188 - [The argument types for AVX's
2189 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2190 been changed from `*const` to `*mut` as the previous implementation
2194 [55148]: https://github.com/rust-lang/rust/pull/55148/
2195 [55238]: https://github.com/rust-lang/rust/pull/55238/
2196 [55280]: https://github.com/rust-lang/rust/pull/55280/
2197 [55610]: https://github.com/rust-lang/rust/pull/55610/
2198 [55663]: https://github.com/rust-lang/rust/pull/55663/
2199 [55702]: https://github.com/rust-lang/rust/pull/55702/
2200 [55837]: https://github.com/rust-lang/rust/pull/55837/
2201 [55843]: https://github.com/rust-lang/rust/pull/55843/
2202 [56072]: https://github.com/rust-lang/rust/pull/56072/
2203 [56245]: https://github.com/rust-lang/rust/pull/56245/
2204 [56365]: https://github.com/rust-lang/rust/pull/56365/
2205 [56366]: https://github.com/rust-lang/rust/pull/56366/
2206 [56395]: https://github.com/rust-lang/rust/pull/56395/
2207 [56759]: https://github.com/rust-lang/rust/pull/56759/
2208 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2209 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2210 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2211 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2212 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2213 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2214 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2215 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2216 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2217 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2218 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2219 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2220 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2221 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2222 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2223 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2224 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2225 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2226 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2227 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2228 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2229 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2230 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2231 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2232 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2233 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2234 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2235 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2236 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2237 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2238 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2239 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2240 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2241 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2242 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2243 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2244 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2245 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2246 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2247 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2248 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2249 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2250 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2251 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2252 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2253 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2254 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2255 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2256 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2257 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2258 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2259 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2260 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2261 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2262 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2263 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2264 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2265 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2266 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2267 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2268 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2269 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2270 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2271 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2272 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2273 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2274 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2275 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2276 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2277 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2278 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2279 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2280 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2281 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2282 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2283 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2284 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2285 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2286 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2287 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2288 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2289 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2290 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2291 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2292 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2293 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2294 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2295 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2296 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2297 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2298 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2299 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2300 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2303 Version 1.31.1 (2018-12-20)
2304 ===========================
2306 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2307 - [Fix broken go-to-definition in RLS][rls/1171]
2308 - [Fix infinite loop on hover in RLS][rls/1170]
2310 [56562]: https://github.com/rust-lang/rust/pull/56562
2311 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2312 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2314 Version 1.31.0 (2018-12-06)
2315 ==========================
2319 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2320 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2321 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2322 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2324 - [You can now define and use `const` functions.][54835] These are currently
2325 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2326 [language reference][const-reference] for what exactly is available.
2327 - [You can now use tool lints, which allow you to scope lints from external
2328 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2329 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2330 a crate, not just in exported functions.][54451]
2331 - [You can now use parentheses in pattern matches.][54497]
2335 - [Updated musl to 1.1.20][54430]
2339 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2340 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2341 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2342 into `Option<&mut T>` using the `From` trait.][53218]
2343 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2348 - [`slice::align_to`]
2349 - [`slice::align_to_mut`]
2350 - [`slice::chunks_exact`]
2351 - [`slice::chunks_exact_mut`]
2352 - [`slice::rchunks`]
2353 - [`slice::rchunks_mut`]
2354 - [`slice::rchunks_exact`]
2355 - [`slice::rchunks_exact_mut`]
2356 - [`Option::replace`]
2360 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2361 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2362 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2364 [52813]: https://github.com/rust-lang/rust/pull/52813/
2365 [53218]: https://github.com/rust-lang/rust/pull/53218/
2366 [53555]: https://github.com/rust-lang/rust/issues/53555/
2367 [54057]: https://github.com/rust-lang/rust/pull/54057/
2368 [54240]: https://github.com/rust-lang/rust/pull/54240/
2369 [54430]: https://github.com/rust-lang/rust/pull/54430/
2370 [54451]: https://github.com/rust-lang/rust/pull/54451/
2371 [54497]: https://github.com/rust-lang/rust/pull/54497/
2372 [54778]: https://github.com/rust-lang/rust/pull/54778/
2373 [54835]: https://github.com/rust-lang/rust/pull/54835/
2374 [54870]: https://github.com/rust-lang/rust/pull/54870/
2375 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2376 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2377 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2378 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2379 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2380 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2381 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2382 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2383 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2384 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2385 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2386 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2387 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2388 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2390 Version 1.30.1 (2018-11-08)
2391 ===========================
2393 - [Fixed overflow ICE in rustdoc][54199]
2394 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2396 [54199]: https://github.com/rust-lang/rust/pull/54199
2397 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2399 Version 1.30.0 (2018-10-25)
2400 ==========================
2404 - [Procedural macros are now available.][52081] These kinds of macros allow for
2405 more powerful code generation. There is a [new chapter available][proc-macros]
2406 in the Rust Programming Language book that goes further in depth.
2407 - [You can now use keywords as identifiers using the raw identifiers
2408 syntax (`r#`),][53236] e.g. `let r#for = true;`
2409 - [Using anonymous parameters in traits is now deprecated with a warning and
2410 will be a hard error in the 2018 edition.][53272]
2411 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2412 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2413 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2414 Previously, using a external crate in a module without a use statement
2415 required `let json = ::serde_json::from_str(foo);` but can now be written
2416 as `let json = serde_json::from_str(foo);`.
2417 - [You can now apply the `#[used]` attribute to static items to prevent the
2418 compiler from optimising them away, even if they appear to be unused,][51363]
2419 e.g. `#[used] static FOO: u32 = 1;`
2420 - [You can now import and reexport macros from other crates with the `use`
2421 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2422 the root module of the crate. If your macro relies on calling other local
2423 macros, it is recommended to export with the
2424 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2426 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2427 using the `vis` specifier.][53370]
2428 - [Non-macro attributes now allow all forms of literals, not just
2429 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2430 write `#[attr(true)]`.
2431 - [You can now specify a function to handle a panic in the Rust runtime with the
2432 `#[panic_handler]` attribute.][51366]
2436 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2437 - [Added the `aarch64-unknown-netbsd` target][53165]
2438 - [Upgraded to LLVM 8.][53611]
2442 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2446 - [`Ipv4Addr::BROADCAST`]
2447 - [`Ipv4Addr::LOCALHOST`]
2448 - [`Ipv4Addr::UNSPECIFIED`]
2449 - [`Ipv6Addr::LOCALHOST`]
2450 - [`Ipv6Addr::UNSPECIFIED`]
2451 - [`Iterator::find_map`]
2453 The following methods are replacement methods for `trim_left`, `trim_right`,
2454 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2456 - [`str::trim_end_matches`]
2458 - [`str::trim_start_matches`]
2459 - [`str::trim_start`]
2463 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2464 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2465 equivalent to calling `rustdoc --error-format=json`.
2466 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2470 - [`rustdoc` allows you to specify what edition to treat your code as with the
2471 `--edition` option.][54057]
2472 - [`rustdoc` now has the `--color` (specify whether to output color) and
2473 `--error-format` (specify error format, e.g. `json`) options.][53003]
2474 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2475 debug symbols.][53774]
2476 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2477 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2479 [50911]: https://github.com/rust-lang/rust/pull/50911/
2480 [51363]: https://github.com/rust-lang/rust/pull/51363/
2481 [51366]: https://github.com/rust-lang/rust/pull/51366/
2482 [52081]: https://github.com/rust-lang/rust/pull/52081/
2483 [53003]: https://github.com/rust-lang/rust/pull/53003/
2484 [53033]: https://github.com/rust-lang/rust/pull/53033/
2485 [53044]: https://github.com/rust-lang/rust/pull/53044/
2486 [53165]: https://github.com/rust-lang/rust/pull/53165/
2487 [53611]: https://github.com/rust-lang/rust/pull/53611/
2488 [53213]: https://github.com/rust-lang/rust/pull/53213/
2489 [53236]: https://github.com/rust-lang/rust/pull/53236/
2490 [53272]: https://github.com/rust-lang/rust/pull/53272/
2491 [53370]: https://github.com/rust-lang/rust/pull/53370/
2492 [53459]: https://github.com/rust-lang/rust/pull/53459/
2493 [53774]: https://github.com/rust-lang/rust/pull/53774/
2494 [53822]: https://github.com/rust-lang/rust/pull/53822/
2495 [54057]: https://github.com/rust-lang/rust/pull/54057/
2496 [54146]: https://github.com/rust-lang/rust/pull/54146/
2497 [54404]: https://github.com/rust-lang/rust/pull/54404/
2498 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2499 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2500 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2501 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2503 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2504 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2505 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2506 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2507 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2508 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2509 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2510 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2511 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2512 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2515 Version 1.29.2 (2018-10-11)
2516 ===========================
2518 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2519 - The `rls-preview` component on the windows-gnu targets has been restored.
2521 [54639]: https://github.com/rust-lang/rust/pull/54639
2524 Version 1.29.1 (2018-09-25)
2525 ===========================
2530 - The standard library's `str::repeat` function contained an out of bounds write
2531 caused by an integer overflow. This has been fixed by deterministically
2532 panicking when an overflow happens.
2534 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2538 Version 1.29.0 (2018-09-13)
2539 ==========================
2543 - [Bumped minimum LLVM version to 5.0.][51899]
2544 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2545 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2546 - [Upgraded to LLVM 7.][51966]
2550 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2551 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2552 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2553 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2555 - [`Cell<T>` now allows `T` to be unsized.][50494]
2556 - [`SocketAddr` is now stable on Redox.][52656]
2561 - [`Iterator::flatten`]
2566 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2567 `--locked` to disable this behavior.
2568 - [`cargo-install` will now allow you to cross compile an install
2569 using `--target`.][cargo/5614]
2570 - [Added the `cargo-fix` subcommand to automatically move project code from
2571 2015 edition to 2018.][cargo/5723]
2572 - [`cargo doc` can now optionally document private types using the
2573 `--document-private-items` flag.][cargo/5543]
2577 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2578 the specified level to that level.][52354] For example `--cap-lints warn`
2579 will demote `deny` and `forbid` lints to `warn`.
2580 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2581 fails and `101` if there is a panic.][52197]
2582 - [A preview of clippy has been made available through rustup.][51122]
2583 You can install the preview with `rustup component add clippy-preview`.
2587 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2588 Use `str::get_unchecked(begin..end)` instead.
2589 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2590 Consider using the `home_dir` function from
2591 https://crates.io/crates/dirs instead.
2592 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2593 - [`cfg` attributes and `--cfg` command line flags are now more
2594 strictly validated.][53893]
2596 [53893]: https://github.com/rust-lang/rust/pull/53893/
2597 [52861]: https://github.com/rust-lang/rust/pull/52861/
2598 [51966]: https://github.com/rust-lang/rust/pull/51966/
2599 [52656]: https://github.com/rust-lang/rust/pull/52656/
2600 [52239]: https://github.com/rust-lang/rust/pull/52239/
2601 [52330]: https://github.com/rust-lang/rust/pull/52330/
2602 [52354]: https://github.com/rust-lang/rust/pull/52354/
2603 [52402]: https://github.com/rust-lang/rust/pull/52402/
2604 [52103]: https://github.com/rust-lang/rust/pull/52103/
2605 [52197]: https://github.com/rust-lang/rust/pull/52197/
2606 [51807]: https://github.com/rust-lang/rust/pull/51807/
2607 [51899]: https://github.com/rust-lang/rust/pull/51899/
2608 [51912]: https://github.com/rust-lang/rust/pull/51912/
2609 [51511]: https://github.com/rust-lang/rust/pull/51511/
2610 [51619]: https://github.com/rust-lang/rust/pull/51619/
2611 [51656]: https://github.com/rust-lang/rust/pull/51656/
2612 [51178]: https://github.com/rust-lang/rust/pull/51178/
2613 [51122]: https://github.com/rust-lang/rust/pull/51122
2614 [50494]: https://github.com/rust-lang/rust/pull/50494/
2615 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2616 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2617 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2618 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2619 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2620 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2621 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2624 Version 1.28.0 (2018-08-02)
2625 ===========================
2629 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2630 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2631 the inner type across Foreign Function Interface (FFI) boundaries.
2632 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2633 and can now be used as identifiers.][51196]
2634 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2635 stable.][51241] This will allow users to specify a global allocator for
2637 - [Unit test functions marked with the `#[test]` attribute can now return
2638 `Result<(), E: Debug>` in addition to `()`.][51298]
2639 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2640 allows macros to easily target lifetimes.
2644 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2645 prioritise making smaller binary sizes. `z` is the same as `s` with the
2646 exception that it does not vectorise loops, which typically results in an even
2648 - [The short error format is now stable.][49546] Specified with
2649 `--error-format=short` this option will provide a more compressed output of
2650 rust error messages.
2651 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2652 - [Reduced the number of allocations in the macro parser.][50855] This can
2653 improve compile times of macro heavy crates on average by 5%.
2657 - [Implemented `Default` for `&mut str`.][51306]
2658 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2659 - [Implemented `Extend` for `()`.][50234]
2660 - [The `Debug` implementation of `time::Duration` should now be more easily
2661 human readable.][50364] Previously a `Duration` of one second would printed as
2662 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2663 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2664 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2665 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2666 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2667 for `PathBuf`.][50170]
2668 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2669 and `Wrapping<i128>`.][50465]
2670 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2671 possible.][51050] This can provide up to a 40% speed increase.
2672 - [Improved error messages when using `format!`.][50610]
2676 - [`Iterator::step_by`]
2677 - [`Path::ancestors`]
2678 - [`SystemTime::UNIX_EPOCH`]
2679 - [`alloc::GlobalAlloc`]
2681 - [`alloc::LayoutErr`]
2684 - [`alloc::alloc_zeroed`]
2685 - [`alloc::dealloc`]
2686 - [`alloc::realloc`]
2687 - [`alloc::handle_alloc_error`]
2688 - [`btree_map::Entry::or_default`]
2689 - [`fmt::Alignment`]
2690 - [`hash_map::Entry::or_default`]
2691 - [`iter::repeat_with`]
2692 - [`num::NonZeroUsize`]
2693 - [`num::NonZeroU128`]
2694 - [`num::NonZeroU16`]
2695 - [`num::NonZeroU32`]
2696 - [`num::NonZeroU64`]
2697 - [`num::NonZeroU8`]
2698 - [`ops::RangeBounds`]
2699 - [`slice::SliceIndex`]
2700 - [`slice::from_mut`]
2701 - [`slice::from_ref`]
2702 - [`{Any + Send + Sync}::downcast_mut`]
2703 - [`{Any + Send + Sync}::downcast_ref`]
2704 - [`{Any + Send + Sync}::is`]
2708 - [Cargo will now no longer allow you to publish crates with build scripts that
2709 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2710 considered to be immutable.
2714 - [The `suggestion_applicability` field in `rustc`'s json output is now
2715 stable.][50486] This will allow dev tools to check whether a code suggestion
2716 would apply to them.
2720 - [Rust will consider trait objects with duplicated constraints to be the same
2721 type as without the duplicated constraint.][51276] For example the below code will
2722 now fail to compile.
2727 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2730 impl Trait + Send + Send {
2731 fn test(&self) { println!("two"); }
2735 [49546]: https://github.com/rust-lang/rust/pull/49546/
2736 [50143]: https://github.com/rust-lang/rust/pull/50143/
2737 [50170]: https://github.com/rust-lang/rust/pull/50170/
2738 [50234]: https://github.com/rust-lang/rust/pull/50234/
2739 [50265]: https://github.com/rust-lang/rust/pull/50265/
2740 [50364]: https://github.com/rust-lang/rust/pull/50364/
2741 [50385]: https://github.com/rust-lang/rust/pull/50385/
2742 [50465]: https://github.com/rust-lang/rust/pull/50465/
2743 [50486]: https://github.com/rust-lang/rust/pull/50486/
2744 [50554]: https://github.com/rust-lang/rust/pull/50554/
2745 [50610]: https://github.com/rust-lang/rust/pull/50610/
2746 [50855]: https://github.com/rust-lang/rust/pull/50855/
2747 [51050]: https://github.com/rust-lang/rust/pull/51050/
2748 [51196]: https://github.com/rust-lang/rust/pull/51196/
2749 [51200]: https://github.com/rust-lang/rust/pull/51200/
2750 [51241]: https://github.com/rust-lang/rust/pull/51241/
2751 [51276]: https://github.com/rust-lang/rust/pull/51276/
2752 [51298]: https://github.com/rust-lang/rust/pull/51298/
2753 [51306]: https://github.com/rust-lang/rust/pull/51306/
2754 [51562]: https://github.com/rust-lang/rust/pull/51562/
2755 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2756 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2757 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2758 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2759 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2760 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2761 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2762 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2763 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2764 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2765 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2766 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2767 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2768 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2769 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2770 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2771 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2772 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2773 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2774 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2775 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2776 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2777 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2778 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2779 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2780 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2781 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2782 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2783 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2784 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2786 Version 1.27.2 (2018-07-20)
2787 ===========================
2792 - The borrow checker was fixed to avoid potential unsoundness when using
2793 match ergonomics: [#52213][52213].
2795 [52213]: https://github.com/rust-lang/rust/issues/52213
2797 Version 1.27.1 (2018-07-10)
2798 ===========================
2803 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2804 when running, which enabled executing code as some other user on a
2805 given machine. This release fixes that vulnerability; you can read
2806 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2808 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2813 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2814 match ergonomics: [#51415][51415], [#49534][49534].
2816 [51415]: https://github.com/rust-lang/rust/issues/51415
2817 [49534]: https://github.com/rust-lang/rust/issues/49534
2818 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2819 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2821 Version 1.27.0 (2018-06-21)
2822 ==========================
2826 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2827 be used as an identifier.
2828 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2829 bare `Trait` syntax, and should make it clearer when being used in tandem with
2830 `impl Trait` because it is equivalent to the following syntax:
2831 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2832 `Box<Trait> == Box<dyn Trait>`.
2833 - [Attributes on generic parameters such as types and lifetimes are
2834 now stable.][48851] e.g.
2835 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2836 - [The `#[must_use]` attribute can now also be used on functions as well as
2837 types.][48925] It provides a lint that by default warns users when the
2838 value returned by a function has not been used.
2842 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2846 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2847 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2848 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2849 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2850 the `cfg` attribute.
2851 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2852 std are now available in core.][49896]
2853 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2855 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2856 that the operation isn't done in place.
2857 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2858 the `#[must_use]` attribute][49533] to warn about unused potentially
2859 expensive allocations.
2863 - [`DoubleEndedIterator::rfind`]
2864 - [`DoubleEndedIterator::rfold`]
2865 - [`DoubleEndedIterator::try_rfold`]
2866 - [`Duration::from_micros`]
2867 - [`Duration::from_nanos`]
2868 - [`Duration::subsec_micros`]
2869 - [`Duration::subsec_millis`]
2870 - [`HashMap::remove_entry`]
2871 - [`Iterator::try_fold`]
2872 - [`Iterator::try_for_each`]
2874 - [`Option::filter`]
2875 - [`String::replace_range`]
2876 - [`Take::set_limit`]
2877 - [`hint::unreachable_unchecked`]
2878 - [`os::unix::process::parent_id`]
2879 - [`ptr::swap_nonoverlapping`]
2880 - [`slice::rsplit_mut`]
2882 - [`slice::swap_with_slice`]
2886 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2887 `readme`, and `repository` fields.][cargo/5386]
2888 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2889 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2890 a different directory than `target` for placing compilation artifacts.
2891 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2892 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2893 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2894 where cargo would infer a binary, Cargo will produce a warning. You can
2895 disable this feature ahead of time by setting any of the following to false:
2896 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2897 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2898 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2902 - [Added “The Rustc book” into the official documentation.][49707]
2903 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2904 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2908 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2909 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2910 compile, `"".is_empty()` will still compile.
2911 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2912 will only print the inner type.][48553] E.g.
2913 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2914 not `AtomicBool(true)`.
2915 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2916 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2917 alignment should cover all use cases.
2918 - The `.description()` method on the `std::error::Error` trait
2919 [has been soft-deprecated][50163]. It is no longer required to implement it.
2921 [48553]: https://github.com/rust-lang/rust/pull/48553/
2922 [48851]: https://github.com/rust-lang/rust/pull/48851/
2923 [48925]: https://github.com/rust-lang/rust/pull/48925/
2924 [49533]: https://github.com/rust-lang/rust/pull/49533/
2925 [49623]: https://github.com/rust-lang/rust/pull/49623/
2926 [49630]: https://github.com/rust-lang/rust/pull/49630/
2927 [49664]: https://github.com/rust-lang/rust/pull/49664/
2928 [49699]: https://github.com/rust-lang/rust/pull/49699/
2929 [49707]: https://github.com/rust-lang/rust/pull/49707/
2930 [49719]: https://github.com/rust-lang/rust/pull/49719/
2931 [49896]: https://github.com/rust-lang/rust/pull/49896/
2932 [49968]: https://github.com/rust-lang/rust/pull/49968/
2933 [50163]: https://github.com/rust-lang/rust/pull/50163
2934 [50177]: https://github.com/rust-lang/rust/pull/50177/
2935 [50378]: https://github.com/rust-lang/rust/pull/50378/
2936 [50398]: https://github.com/rust-lang/rust/pull/50398/
2937 [50423]: https://github.com/rust-lang/rust/pull/50423/
2938 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2939 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2940 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2941 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2942 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2943 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2944 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2945 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2946 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2947 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2948 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2949 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2950 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2951 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2952 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2953 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2954 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2955 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2956 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2957 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2958 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2959 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2960 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2961 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2962 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2963 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2964 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2965 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2966 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2967 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2970 Version 1.26.2 (2018-06-05)
2971 ==========================
2976 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2978 [51117]: https://github.com/rust-lang/rust/issues/51117
2981 Version 1.26.1 (2018-05-29)
2982 ==========================
2987 - [RLS now works on Windows.][50646]
2988 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2994 - [`fn main() -> impl Trait` no longer works for non-Termination
2996 This reverts an accidental stabilization.
2997 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2998 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3000 [50646]: https://github.com/rust-lang/rust/issues/50646
3001 [50656]: https://github.com/rust-lang/rust/pull/50656
3002 [50812]: https://github.com/rust-lang/rust/pull/50812
3003 [50950]: https://github.com/rust-lang/rust/issues/50950
3004 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3006 Version 1.26.0 (2018-05-10)
3007 ==========================
3011 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3012 implement either or both traits.][49299]
3013 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3014 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3015 lifetime can be elided.][49458]
3016 - [`impl Trait` is now stable allowing you to have abstract types in returns
3017 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3018 `fn open(path: impl AsRef<Path>)`.
3019 - [Pattern matching will now automatically apply dereferences.][49394]
3020 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3021 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3022 - [A lot of operations are now available in a const context.][46882] E.g. You
3023 can now index into constant arrays, reference and dereference into constants,
3024 and use tuple struct constructors.
3025 - [Fixed entry slice patterns are now stable.][48516] E.g.
3027 let points = [1, 2, 3, 4];
3029 [1, 2, 3, 4] => println!("All points were sequential."),
3030 _ => println!("Not all points were sequential."),
3037 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3038 - [Fixed exponential projection complexity on nested types.][48296]
3039 This can provide up to a ~12% reduction in compile times for certain crates.
3040 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3041 to remap path prefixes outputted by the compiler.
3042 - [Added `powerpc-unknown-netbsd` target.][48281]
3046 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3047 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3048 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3049 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3050 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3051 - [`ascii::escape_default` is now available in libcore.][48735]
3052 - [Trailing commas are now supported in std and core macros.][48056]
3053 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3054 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3059 - [`*const T::copy_to_nonoverlapping`]
3060 - [`*const T::copy_to`]
3061 - [`*const T::read_unaligned`]
3062 - [`*const T::read_volatile`]
3063 - [`*const T::read`]
3065 - [`*const T::wrapping_add`]
3066 - [`*const T::wrapping_sub`]
3068 - [`*mut T::copy_to_nonoverlapping`]
3069 - [`*mut T::copy_to`]
3070 - [`*mut T::read_unaligned`]
3071 - [`*mut T::read_volatile`]
3073 - [`*mut T::replace`]
3076 - [`*mut T::wrapping_add`]
3077 - [`*mut T::wrapping_sub`]
3078 - [`*mut T::write_bytes`]
3079 - [`*mut T::write_unaligned`]
3080 - [`*mut T::write_volatile`]
3083 - [`FromUtf8Error::as_bytes`]
3084 - [`LocalKey::try_with`]
3085 - [`Option::cloned`]
3086 - [`btree_map::Entry::and_modify`]
3087 - [`fs::read_to_string`]
3090 - [`hash_map::Entry::and_modify`]
3091 - [`iter::FusedIterator`]
3092 - [`ops::RangeInclusive`]
3093 - [`ops::RangeToInclusive`]
3095 - [`slice::rotate_left`]
3096 - [`slice::rotate_right`]
3097 - [`String::retain`]
3102 - [Cargo will now output path to custom commands when `-v` is
3103 passed with `--list`][cargo/5041]
3104 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3108 - [The second edition of "The Rust Programming Language" book is now recommended
3109 over the first.][48404]
3114 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3115 syntax is now invalid.
3117 use std::ops::Fn as dyn;
3118 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3120 - [The result of dereferences are no longer promoted to `'static`.][47408]
3124 const PAIR: &(i32, i32) = &(0, 1);
3125 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3128 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3129 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3131 - [Removed hoedown from rustdoc.][48274]
3132 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3134 [46882]: https://github.com/rust-lang/rust/pull/46882
3135 [47379]: https://github.com/rust-lang/rust/pull/47379
3136 [47408]: https://github.com/rust-lang/rust/pull/47408
3137 [47813]: https://github.com/rust-lang/rust/pull/47813
3138 [48056]: https://github.com/rust-lang/rust/pull/48056
3139 [48125]: https://github.com/rust-lang/rust/pull/48125
3140 [48166]: https://github.com/rust-lang/rust/pull/48166
3141 [48235]: https://github.com/rust-lang/rust/pull/48235
3142 [48274]: https://github.com/rust-lang/rust/pull/48274
3143 [48281]: https://github.com/rust-lang/rust/pull/48281
3144 [48296]: https://github.com/rust-lang/rust/pull/48296
3145 [48326]: https://github.com/rust-lang/rust/pull/48326
3146 [48359]: https://github.com/rust-lang/rust/pull/48359
3147 [48404]: https://github.com/rust-lang/rust/pull/48404
3148 [48481]: https://github.com/rust-lang/rust/pull/48481
3149 [48516]: https://github.com/rust-lang/rust/pull/48516
3150 [48628]: https://github.com/rust-lang/rust/pull/48628
3151 [48629]: https://github.com/rust-lang/rust/pull/48629
3152 [48657]: https://github.com/rust-lang/rust/pull/48657
3153 [48735]: https://github.com/rust-lang/rust/pull/48735
3154 [48978]: https://github.com/rust-lang/rust/pull/48978
3155 [49101]: https://github.com/rust-lang/rust/pull/49101
3156 [49109]: https://github.com/rust-lang/rust/pull/49109
3157 [49121]: https://github.com/rust-lang/rust/pull/49121
3158 [49162]: https://github.com/rust-lang/rust/pull/49162
3159 [49184]: https://github.com/rust-lang/rust/pull/49184
3160 [49234]: https://github.com/rust-lang/rust/pull/49234
3161 [49255]: https://github.com/rust-lang/rust/pull/49255
3162 [49299]: https://github.com/rust-lang/rust/pull/49299
3163 [49305]: https://github.com/rust-lang/rust/pull/49305
3164 [49394]: https://github.com/rust-lang/rust/pull/49394
3165 [49458]: https://github.com/rust-lang/rust/pull/49458
3166 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3167 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3168 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3169 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3170 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3171 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3172 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3173 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3174 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3175 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3176 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3177 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3178 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3179 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3180 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3181 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3182 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3183 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3184 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3185 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3186 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3187 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3188 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3189 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3190 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3191 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3192 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3193 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3194 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3195 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3196 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3197 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3198 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3199 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3200 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3201 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3202 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3203 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3204 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3205 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3206 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3207 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3210 Version 1.25.0 (2018-03-29)
3211 ==========================
3215 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3216 - [You can now use nested groups of imports.][47948]
3217 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3218 - [You can now have `|` at the start of a match arm.][47947] e.g.
3220 enum Foo { A, B, C }
3226 | Foo::B => println!("AB"),
3227 | Foo::C => println!("C"),
3234 - [Upgraded to LLVM 6.][47828]
3235 - [Added `-C lto=val` option.][47521]
3236 - [Added `i586-unknown-linux-musl` target][47282]
3240 - [Impl Send for `process::Command` on Unix.][47760]
3241 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3242 - [`UnsafeCell::into_inner` is now safe.][47204]
3243 - [Implement libstd for CloudABI.][47268]
3244 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3245 - [Implement `AsRef<Path>` for Component][46985]
3246 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3247 - [Moved `Duration` to libcore.][46666]
3251 - [`Location::column`]
3254 The following functions can now be used in a constant expression.
3255 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3256 - [`Duration::new`][47300]
3257 - [`Duration::from_secs`][47300]
3258 - [`Duration::from_millis`][47300]
3262 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3263 - [`cargo new` now defaults to creating a binary crate, instead of a
3264 library crate.][cargo/5029]
3268 - [Rust by example is now shipped with new releases][46196]
3272 - [Deprecated `net::lookup_host`.][47510]
3273 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3274 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3275 around indexing operations (see [#47349][47349]). This has been fixed (which also
3276 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3277 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3279 [33903]: https://github.com/rust-lang/rust/pull/33903
3280 [47947]: https://github.com/rust-lang/rust/pull/47947
3281 [47948]: https://github.com/rust-lang/rust/pull/47948
3282 [47760]: https://github.com/rust-lang/rust/pull/47760
3283 [47790]: https://github.com/rust-lang/rust/pull/47790
3284 [47828]: https://github.com/rust-lang/rust/pull/47828
3285 [47398]: https://github.com/rust-lang/rust/pull/47398
3286 [47510]: https://github.com/rust-lang/rust/pull/47510
3287 [47521]: https://github.com/rust-lang/rust/pull/47521
3288 [47204]: https://github.com/rust-lang/rust/pull/47204
3289 [47251]: https://github.com/rust-lang/rust/pull/47251
3290 [47268]: https://github.com/rust-lang/rust/pull/47268
3291 [47282]: https://github.com/rust-lang/rust/pull/47282
3292 [47300]: https://github.com/rust-lang/rust/pull/47300
3293 [47349]: https://github.com/rust-lang/rust/pull/47349
3294 [46931]: https://github.com/rust-lang/rust/pull/46931
3295 [46985]: https://github.com/rust-lang/rust/pull/46985
3296 [47006]: https://github.com/rust-lang/rust/pull/47006
3297 [46830]: https://github.com/rust-lang/rust/pull/46830
3298 [46095]: https://github.com/rust-lang/rust/pull/46095
3299 [46666]: https://github.com/rust-lang/rust/pull/46666
3300 [46196]: https://github.com/rust-lang/rust/pull/46196
3301 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3302 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3303 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3304 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3305 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3308 Version 1.24.1 (2018-03-01)
3309 ==========================
3311 - [Do not abort when unwinding through FFI][48251]
3312 - [Emit UTF-16 files for linker arguments on Windows][48318]
3313 - [Make the error index generator work again][48308]
3314 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3316 [48251]: https://github.com/rust-lang/rust/issues/48251
3317 [48308]: https://github.com/rust-lang/rust/issues/48308
3318 [48318]: https://github.com/rust-lang/rust/issues/48318
3319 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3322 Version 1.24.0 (2018-02-15)
3323 ==========================
3327 - [External `sysv64` ffi is now available.][46528]
3328 eg. `extern "sysv64" fn foo () {}`
3332 - [rustc now uses 16 codegen units by default for release builds.][46910]
3333 For the fastest builds, utilize `codegen-units=1`.
3334 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3335 - [Add `aarch64-unknown-openbsd` support][46760]
3339 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3340 improvement in performance in the majority of cases.
3341 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3342 with Windows.][46798]
3343 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3344 - [impl `From<bool>` for `AtomicBool`][46293]
3345 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3346 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3347 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3348 - [float::from_bits now just uses transmute.][46012] This provides
3349 some optimisations from LLVM.
3350 - [Copied `AsciiExt` methods onto `char`][46077]
3351 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3352 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3353 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3354 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3358 - [`RefCell::replace`]
3360 - [`atomic::spin_loop_hint`]
3362 The following functions can now be used in a constant expression.
3363 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3365 - [`AtomicBool::new`][46287]
3366 - [`AtomicUsize::new`][46287]
3367 - [`AtomicIsize::new`][46287]
3368 - [`AtomicPtr::new`][46287]
3369 - [`Cell::new`][46287]
3370 - [`{integer}::min_value`][46287]
3371 - [`{integer}::max_value`][46287]
3372 - [`mem::size_of`][46287]
3373 - [`mem::align_of`][46287]
3374 - [`ptr::null`][46287]
3375 - [`ptr::null_mut`][46287]
3376 - [`RefCell::new`][46287]
3377 - [`UnsafeCell::new`][46287]
3381 - [Added a `workspace.default-members` config that
3382 overrides implied `--all` in virtual workspaces.][cargo/4743]
3383 - [Enable incremental by default on development builds.][cargo/4817] Also added
3384 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3385 per-project or global basis respectively.
3392 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3393 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3394 in accordance with IETF RFC 4291 §2.2.
3395 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3396 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3397 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3398 - [Leading zeros in tuple struct members is now an error][47084]
3399 - [`column!()` macro is one-based instead of zero-based][46977]
3400 - [`fmt::Arguments` can no longer be shared across threads][45198]
3401 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3402 - [Cargo sets a different working directory for the compiler][cargo/4788]
3404 [44884]: https://github.com/rust-lang/rust/pull/44884
3405 [45198]: https://github.com/rust-lang/rust/pull/45198
3406 [45506]: https://github.com/rust-lang/rust/pull/45506
3407 [45904]: https://github.com/rust-lang/rust/pull/45904
3408 [45990]: https://github.com/rust-lang/rust/pull/45990
3409 [46012]: https://github.com/rust-lang/rust/pull/46012
3410 [46077]: https://github.com/rust-lang/rust/pull/46077
3411 [46094]: https://github.com/rust-lang/rust/pull/46094
3412 [46284]: https://github.com/rust-lang/rust/pull/46284
3413 [46287]: https://github.com/rust-lang/rust/pull/46287
3414 [46293]: https://github.com/rust-lang/rust/pull/46293
3415 [46528]: https://github.com/rust-lang/rust/pull/46528
3416 [46671]: https://github.com/rust-lang/rust/pull/46671
3417 [46713]: https://github.com/rust-lang/rust/pull/46713
3418 [46735]: https://github.com/rust-lang/rust/pull/46735
3419 [46749]: https://github.com/rust-lang/rust/pull/46749
3420 [46760]: https://github.com/rust-lang/rust/pull/46760
3421 [46798]: https://github.com/rust-lang/rust/pull/46798
3422 [46828]: https://github.com/rust-lang/rust/pull/46828
3423 [46831]: https://github.com/rust-lang/rust/pull/46831
3424 [46833]: https://github.com/rust-lang/rust/pull/46833
3425 [46910]: https://github.com/rust-lang/rust/pull/46910
3426 [46977]: https://github.com/rust-lang/rust/pull/46977
3427 [47018]: https://github.com/rust-lang/rust/pull/47018
3428 [47080]: https://github.com/rust-lang/rust/pull/47080
3429 [47084]: https://github.com/rust-lang/rust/pull/47084
3430 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3431 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3432 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3433 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3434 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3435 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3438 Version 1.23.0 (2018-01-04)
3439 ==========================
3443 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3444 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3445 Which should fix some confusing errors in some operations.
3449 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3450 undefined behavior.][45920]
3451 - [rustc now suggests renaming import if names clash.][45660]
3452 - [Display errors/warnings correctly when there are zero-width or
3453 wide characters.][45711]
3454 - [rustc now avoids unnecessary copies of arguments that are
3455 simple bindings][45380] This should improve memory usage on average by 5-10%.
3456 - [Updated musl used to build musl rustc to 1.1.17][45393]
3460 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3461 - [Implement Hash for raw pointers to unsized types][45483]
3462 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3463 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3464 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3465 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3466 and `<*mut T>::as_mut`][44932]
3467 - [Optimized `Thread::{park, unpark}` implementation][45524]
3468 - [Improved `SliceExt::binary_search` performance.][45333]
3469 - [impl `FromIterator<()>` for `()`][45379]
3470 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3478 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3479 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3480 - [Added unit test checking to `cargo check`][cargo/4592]
3481 - [Cargo now lets you install a specific version
3482 using `cargo install --version`][cargo/4637]
3486 - [Releases now ship with the Cargo book documentation.][45692]
3487 - [rustdoc now prints rendering warnings on every run.][45324]
3491 - [Changes have been made to type equality to make it more correct,
3492 in rare cases this could break some code.][45853] [Tracking issue for
3493 further information][45852]
3494 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3495 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3496 Android 9, the minimum supported version is Android 14.
3497 - [Bumped the minimum LLVM to 3.9][45326]
3499 [44042]: https://github.com/rust-lang/rust/pull/44042
3500 [44932]: https://github.com/rust-lang/rust/pull/44932
3501 [45267]: https://github.com/rust-lang/rust/pull/45267
3502 [45324]: https://github.com/rust-lang/rust/pull/45324
3503 [45326]: https://github.com/rust-lang/rust/pull/45326
3504 [45333]: https://github.com/rust-lang/rust/pull/45333
3505 [45379]: https://github.com/rust-lang/rust/pull/45379
3506 [45380]: https://github.com/rust-lang/rust/pull/45380
3507 [45393]: https://github.com/rust-lang/rust/pull/45393
3508 [45435]: https://github.com/rust-lang/rust/pull/45435
3509 [45483]: https://github.com/rust-lang/rust/pull/45483
3510 [45524]: https://github.com/rust-lang/rust/pull/45524
3511 [45571]: https://github.com/rust-lang/rust/pull/45571
3512 [45580]: https://github.com/rust-lang/rust/pull/45580
3513 [45610]: https://github.com/rust-lang/rust/pull/45610
3514 [45660]: https://github.com/rust-lang/rust/pull/45660
3515 [45692]: https://github.com/rust-lang/rust/pull/45692
3516 [45711]: https://github.com/rust-lang/rust/pull/45711
3517 [45772]: https://github.com/rust-lang/rust/pull/45772
3518 [45852]: https://github.com/rust-lang/rust/issues/45852
3519 [45853]: https://github.com/rust-lang/rust/pull/45853
3520 [45887]: https://github.com/rust-lang/rust/pull/45887
3521 [45920]: https://github.com/rust-lang/rust/pull/45920
3522 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3523 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3524 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3527 Version 1.22.1 (2017-11-22)
3528 ==========================
3530 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3532 [46183]: https://github.com/rust-lang/rust/pull/46183
3534 Version 1.22.0 (2017-11-22)
3535 ==========================
3539 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3540 - [Now accepts underscores in unicode escapes][43716]
3541 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3542 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3546 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3547 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3548 This should decrease compile times for debug builds.
3549 - [strict memory alignment now enabled on ARMv6][45094]
3550 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3554 - [Allow atomic operations up to 32 bits
3555 on `armv5te_unknown_linux_gnueabi`][44978]
3556 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3557 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3558 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3559 - [Properly detect overflow in `Instant += Duration`.][44220]
3560 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3561 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3562 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3569 - [Cargo will now build multi file examples in subdirectories of the `examples`
3570 folder that have a `main.rs` file.][cargo/4496]
3571 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3572 the old format will continue to work and can be updated with `cargo update`.
3573 - [Now supports vendoring git repositories][cargo/3992]
3577 - [`libbacktrace` is now available on Apple platforms.][44251]
3578 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3579 This now lets you specify that a given code example will fail to compile.
3583 - [The minimum Android version that rustc can build for has been bumped
3584 to `4.0` from `2.3`][45656]
3585 - [Allowing `T op= &T` for numeric types has broken some type
3586 inference cases][45480]
3589 [42526]: https://github.com/rust-lang/rust/pull/42526
3590 [43017]: https://github.com/rust-lang/rust/pull/43017
3591 [43716]: https://github.com/rust-lang/rust/pull/43716
3592 [43949]: https://github.com/rust-lang/rust/pull/43949
3593 [44015]: https://github.com/rust-lang/rust/pull/44015
3594 [44220]: https://github.com/rust-lang/rust/pull/44220
3595 [44251]: https://github.com/rust-lang/rust/pull/44251
3596 [44287]: https://github.com/rust-lang/rust/pull/44287
3597 [44303]: https://github.com/rust-lang/rust/pull/44303
3598 [44456]: https://github.com/rust-lang/rust/pull/44456
3599 [44466]: https://github.com/rust-lang/rust/pull/44466
3600 [44895]: https://github.com/rust-lang/rust/pull/44895
3601 [44966]: https://github.com/rust-lang/rust/pull/44966
3602 [44978]: https://github.com/rust-lang/rust/pull/44978
3603 [45041]: https://github.com/rust-lang/rust/pull/45041
3604 [45064]: https://github.com/rust-lang/rust/pull/45064
3605 [45075]: https://github.com/rust-lang/rust/pull/45075
3606 [45094]: https://github.com/rust-lang/rust/pull/45094
3607 [45095]: https://github.com/rust-lang/rust/pull/45095
3608 [45480]: https://github.com/rust-lang/rust/issues/45480
3609 [45656]: https://github.com/rust-lang/rust/pull/45656
3610 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3611 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3612 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3619 Version 1.21.0 (2017-10-12)
3620 ==========================
3624 - [You can now use static references for literals.][43838]
3628 let x: &'static u32 = &0;
3631 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3634 my_macro!(Vec<i32>::new); // Always worked
3635 my_macro!(Vec::<i32>::new); // Now works
3640 - [Upgraded jemalloc to 4.5.0][43911]
3641 - [Enabled unwinding panics on Redox][43917]
3642 - [Now runs LLVM in parallel during translation phase.][43506]
3643 This should reduce peak memory usage.
3647 - [Generate builtin impls for `Clone` for all arrays and tuples that
3648 are `T: Clone`][43690]
3649 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3650 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3651 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3656 [`std::mem::discriminant`]
3660 - [You can now call `cargo install` with multiple package names][cargo/4216]
3661 - [Cargo commands inside a virtual workspace will now implicitly
3662 pass `--all`][cargo/4335]
3663 - [Added a `[patch]` section to `Cargo.toml` to handle
3664 prepublication dependencies][cargo/4123] [RFC 1969]
3665 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3666 like patterns][cargo/4270]
3667 - [Added the `--all-targets` option][cargo/4400]
3668 - [Using required dependencies as a feature is now deprecated and emits
3669 a warning][cargo/4364]
3674 - [Cargo docs are moving][43916]
3675 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3676 - [The rustdoc book is now available][43863]
3677 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3678 - [Added a preview of RLS has been made available through rustup][44204]
3679 Install with `rustup component add rls-preview`
3680 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3681 Previously only showed `std::os::unix`.
3685 - [Changes in method matching against higher-ranked types][43880] This may cause
3686 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3687 - [rustc's JSON error output's byte position start at top of file.][42973]
3688 Was previously relative to the rustc's internal `CodeMap` struct which
3689 required the unstable library `libsyntax` to correctly use.
3690 - [`unused_results` lint no longer ignores booleans][43728]
3692 [42565]: https://github.com/rust-lang/rust/pull/42565
3693 [42973]: https://github.com/rust-lang/rust/pull/42973
3694 [43348]: https://github.com/rust-lang/rust/pull/43348
3695 [43459]: https://github.com/rust-lang/rust/pull/43459
3696 [43506]: https://github.com/rust-lang/rust/pull/43506
3697 [43540]: https://github.com/rust-lang/rust/pull/43540
3698 [43690]: https://github.com/rust-lang/rust/pull/43690
3699 [43728]: https://github.com/rust-lang/rust/pull/43728
3700 [43838]: https://github.com/rust-lang/rust/pull/43838
3701 [43863]: https://github.com/rust-lang/rust/pull/43863
3702 [43880]: https://github.com/rust-lang/rust/pull/43880
3703 [43911]: https://github.com/rust-lang/rust/pull/43911
3704 [43916]: https://github.com/rust-lang/rust/pull/43916
3705 [43917]: https://github.com/rust-lang/rust/pull/43917
3706 [44204]: https://github.com/rust-lang/rust/pull/44204
3707 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3708 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3709 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3710 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3711 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3712 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3713 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3714 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3715 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3717 Version 1.20.0 (2017-08-31)
3718 ===========================
3722 - [Associated constants are now stabilised.][42809]
3723 - [A lot of macro bugs are now fixed.][42913]
3728 - [Struct fields are now properly coerced to the expected field type.][42807]
3729 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3730 `wasm32-experimental-emscripten` target.
3731 - [Changed some of the error messages to be more helpful.][42033]
3732 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3734 - [rustc now reports the total number of errors on compilation failure][43015]
3735 previously this was only the number of errors in the pass that failed.
3736 - [Expansion in rustc has been sped up 29x.][42533]
3737 - [added `msp430-none-elf` target.][43099]
3738 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3740 - [Fixes backtraces on Redox][43228]
3741 - [rustc now identifies different versions of same crate when absolute paths of
3742 different types match in an error message.][42826]
3748 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3749 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3751 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3752 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3753 - [Impl `Clone` for `DefaultHasher`.][42799]
3754 - [Impl `Sync` for `SyncSender`.][42397]
3755 - [Impl `FromStr` for `char`][42271]
3756 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3758 - [allow messages in the `unimplemented!()` macro.][42155]
3759 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3760 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3761 - [Upgrade to Unicode 10.0.0][42999]
3762 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3763 - [Skip the main thread's manual stack guard on Linux][43072]
3764 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3765 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3767 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3772 - [`CStr::into_c_string`]
3773 - [`CString::as_c_str`]
3774 - [`CString::into_boxed_c_str`]
3775 - [`Chain::get_mut`]
3776 - [`Chain::get_ref`]
3777 - [`Chain::into_inner`]
3778 - [`Option::get_or_insert_with`]
3779 - [`Option::get_or_insert`]
3780 - [`OsStr::into_os_string`]
3781 - [`OsString::into_boxed_os_str`]
3784 - [`Utf8Error::error_len`]
3785 - [`char::EscapeDebug`]
3786 - [`char::escape_debug`]
3787 - [`compile_error!`]
3788 - [`f32::from_bits`]
3790 - [`f64::from_bits`]
3792 - [`mem::ManuallyDrop`]
3793 - [`slice::sort_unstable_by_key`]
3794 - [`slice::sort_unstable_by`]
3795 - [`slice::sort_unstable`]
3796 - [`str::from_boxed_utf8_unchecked`]
3797 - [`str::as_bytes_mut`]
3798 - [`str::as_bytes_mut`]
3799 - [`str::from_utf8_mut`]
3800 - [`str::from_utf8_unchecked_mut`]
3802 - [`str::get_unchecked_mut`]
3803 - [`str::get_unchecked`]
3805 - [`str::into_boxed_bytes`]
3810 - [Cargo API token location moved from `~/.cargo/config` to
3811 `~/.cargo/credentials`.][cargo/3978]
3812 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3813 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3814 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3815 - [You can now specify version of a binary when installed through
3816 `cargo install` using `--vers`.][cargo/4229]
3817 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3818 failure.][cargo/4248]
3819 - [Changed the convention around which file is the crate root.][cargo/4259]
3820 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3821 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3826 - [Functions with `'static` in their return types will now not be as usable as
3827 if they were using lifetime parameters instead.][42417]
3828 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3829 takes the sign of NaN into account where previously didn't.][42430]
3831 [42033]: https://github.com/rust-lang/rust/pull/42033
3832 [42155]: https://github.com/rust-lang/rust/pull/42155
3833 [42271]: https://github.com/rust-lang/rust/pull/42271
3834 [42397]: https://github.com/rust-lang/rust/pull/42397
3835 [42417]: https://github.com/rust-lang/rust/pull/42417
3836 [42430]: https://github.com/rust-lang/rust/pull/42430
3837 [42431]: https://github.com/rust-lang/rust/pull/42431
3838 [42533]: https://github.com/rust-lang/rust/pull/42533
3839 [42571]: https://github.com/rust-lang/rust/pull/42571
3840 [42613]: https://github.com/rust-lang/rust/pull/42613
3841 [42799]: https://github.com/rust-lang/rust/pull/42799
3842 [42807]: https://github.com/rust-lang/rust/pull/42807
3843 [42809]: https://github.com/rust-lang/rust/pull/42809
3844 [42822]: https://github.com/rust-lang/rust/pull/42822
3845 [42826]: https://github.com/rust-lang/rust/pull/42826
3846 [42854]: https://github.com/rust-lang/rust/pull/42854
3847 [42913]: https://github.com/rust-lang/rust/pull/42913
3848 [42999]: https://github.com/rust-lang/rust/pull/42999
3849 [43011]: https://github.com/rust-lang/rust/pull/43011
3850 [43015]: https://github.com/rust-lang/rust/pull/43015
3851 [43072]: https://github.com/rust-lang/rust/pull/43072
3852 [43077]: https://github.com/rust-lang/rust/pull/43077
3853 [43097]: https://github.com/rust-lang/rust/pull/43097
3854 [43099]: https://github.com/rust-lang/rust/pull/43099
3855 [43170]: https://github.com/rust-lang/rust/pull/43170
3856 [43178]: https://github.com/rust-lang/rust/pull/43178
3857 [43185]: https://github.com/rust-lang/rust/pull/43185
3858 [43228]: https://github.com/rust-lang/rust/pull/43228
3859 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3860 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3861 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3862 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3863 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3864 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3865 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3866 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3867 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3868 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3869 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3870 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3871 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3872 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3873 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3874 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3875 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3876 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3877 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3878 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3879 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3880 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3881 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3882 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3883 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3884 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3885 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3886 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3887 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3888 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3889 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3890 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3891 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3892 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3893 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3894 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3895 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3896 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3897 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3900 Version 1.19.0 (2017-07-20)
3901 ===========================
3906 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3907 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3908 - [Macro recursion limit increased to 1024 from 64.][41676]
3909 - [Added lint for detecting unused macros.][41907]
3910 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3911 For example: `let x = loop { break 7; };`
3912 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3913 contain `Copy` types and cannot have a `Drop` implementation.
3914 Example: `union Foo { bar: u8, baz: usize }`
3915 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3916 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3921 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3922 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3923 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3924 you should use `--target armv7-linux-androideabi`.
3925 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3926 - [Minor optimisation of string operations.][42037]
3927 - [Compiler error message is now `aborting due to previous error(s)` instead of
3928 `aborting due to N previous errors`][42150] This was previously inaccurate and
3929 would only count certain kinds of errors.
3930 - [The compiler now supports Visual Studio 2017][42225]
3931 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3932 - [Added a lot][42264] of [new error codes][42302]
3933 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3934 libraries with C Run-time Libraries(CRT) to be statically linked.
3935 - [Fixed various ARM codegen bugs][42740]
3940 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3941 `Extend<Cow<'a, str>>`][41449]
3942 - [`Vec` now implements `From<&mut [T]>`][41530]
3943 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3944 - [`SplitWhitespace` now implements `Clone`][41659]
3945 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3947 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3948 macros, but for printing to stderr.
3953 - [`OsString::shrink_to_fit`]
3956 - [`thread::ThreadId`]
3961 - [Build scripts can now add environment variables to the environment
3962 the crate is being compiled in.
3963 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3964 - [Subcommands now replace the current process rather than spawning a new
3965 child process][cargo/3970]
3966 - [Workspace members can now accept glob file patterns][cargo/3979]
3967 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3968 the members in a given workspace.][cargo/3988]
3969 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3970 - [Target directory path is now in the cargo metadata][cargo/4022]
3971 - [Cargo no longer checks out a local working directory for the
3972 crates.io index][cargo/4026] This should provide smaller file size for the
3973 registry, and improve cloning times, especially on Windows machines.
3974 - [Added an `--exclude` option for excluding certain packages when using the
3975 `--all` option][cargo/4031]
3976 - [Cargo will now automatically retry when receiving a 5xx error
3977 from crates.io][cargo/4032]
3978 - [The `--features` option now accepts multiple comma or space
3979 delimited values.][cargo/4084]
3980 - [Added support for custom target specific runners][cargo/3954]
3985 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3987 - [Rust will now release XZ compressed packages][rust-installer/57]
3988 - [rustup will now prefer to download rust packages with
3989 XZ compression][rustup/1100] over GZip packages.
3990 - [Added the ability to escape `#` in rust documentation][41785] By adding
3991 additional `#`'s ie. `##` is now `#`
3996 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3997 - [`-Z` flags are now no longer allowed to be used on the stable
3998 compiler.][41751] This has been a warning for a year previous to this.
3999 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4000 longer works][42844]. Users should migrate to the built-in `check`
4001 command, which has been available since 1.16.
4002 - [Ending a float literal with `._` is now a hard error.
4003 Example: `42._` .][41946]
4004 - [Any use of a private `extern crate` outside of its module is now a
4005 hard error.][36886] This was previously a warning.
4006 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4007 relative while the `::` prefix makes a path absolute, but was ignored and the
4008 path was relative regardless.
4009 - [Floating point constants in match patterns is now a hard error][36890]
4010 This was previously a warning.
4011 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4012 match patterns is now a hard error][36891] This was previously a warning.
4013 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4015 - [From the pound escape, lines consisting of multiple `#`s are
4017 - [It is an error to re-export private enum variants][42460]. This is
4018 known to break a number of crates that depend on an older version of
4020 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4021 to use it to find the linker, and the build will fail where it did
4022 not previously][42607]
4024 [36886]: https://github.com/rust-lang/rust/issues/36886
4025 [36888]: https://github.com/rust-lang/rust/issues/36888
4026 [36890]: https://github.com/rust-lang/rust/issues/36890
4027 [36891]: https://github.com/rust-lang/rust/issues/36891
4028 [36892]: https://github.com/rust-lang/rust/issues/36892
4029 [37406]: https://github.com/rust-lang/rust/issues/37406
4030 [39983]: https://github.com/rust-lang/rust/pull/39983
4031 [41145]: https://github.com/rust-lang/rust/pull/41145
4032 [41192]: https://github.com/rust-lang/rust/pull/41192
4033 [41258]: https://github.com/rust-lang/rust/pull/41258
4034 [41370]: https://github.com/rust-lang/rust/pull/41370
4035 [41449]: https://github.com/rust-lang/rust/pull/41449
4036 [41530]: https://github.com/rust-lang/rust/pull/41530
4037 [41624]: https://github.com/rust-lang/rust/pull/41624
4038 [41656]: https://github.com/rust-lang/rust/pull/41656
4039 [41659]: https://github.com/rust-lang/rust/pull/41659
4040 [41676]: https://github.com/rust-lang/rust/pull/41676
4041 [41751]: https://github.com/rust-lang/rust/pull/41751
4042 [41764]: https://github.com/rust-lang/rust/pull/41764
4043 [41785]: https://github.com/rust-lang/rust/pull/41785
4044 [41873]: https://github.com/rust-lang/rust/pull/41873
4045 [41907]: https://github.com/rust-lang/rust/pull/41907
4046 [41946]: https://github.com/rust-lang/rust/pull/41946
4047 [42016]: https://github.com/rust-lang/rust/pull/42016
4048 [42037]: https://github.com/rust-lang/rust/pull/42037
4049 [42068]: https://github.com/rust-lang/rust/pull/42068
4050 [42150]: https://github.com/rust-lang/rust/pull/42150
4051 [42162]: https://github.com/rust-lang/rust/pull/42162
4052 [42225]: https://github.com/rust-lang/rust/pull/42225
4053 [42264]: https://github.com/rust-lang/rust/pull/42264
4054 [42302]: https://github.com/rust-lang/rust/pull/42302
4055 [42460]: https://github.com/rust-lang/rust/issues/42460
4056 [42607]: https://github.com/rust-lang/rust/issues/42607
4057 [42740]: https://github.com/rust-lang/rust/pull/42740
4058 [42844]: https://github.com/rust-lang/rust/issues/42844
4059 [42948]: https://github.com/rust-lang/rust/pull/42948
4060 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4061 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4062 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4063 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4064 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4065 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4066 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4067 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4068 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4069 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4070 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4071 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4072 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4073 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4074 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4075 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4076 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4077 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4078 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4079 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4080 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4081 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4084 Version 1.18.0 (2017-06-08)
4085 ===========================
4090 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4091 make the item visible to just that module tree. Also accepts the keyword
4092 `crate` to make something public to the whole crate but not users of the
4093 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4094 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4095 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4096 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4097 types like `Write + Send`, trailing `+` are now supported in trait objects,
4098 and better error reporting for trait objects starting with `?Sized`.
4099 - [0e+10 is now a valid floating point literal][40589]
4100 - [Now warns if you bind a lifetime parameter to 'static][40734]
4101 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4102 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4103 representation in some cases.][40377]
4108 - [rustc can now emit mir with `--emit mir`][39891]
4109 - [Improved LLVM IR for trivial functions][40367]
4110 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4111 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4112 opportunities found through profiling
4113 - [Improved backtrace formatting when panicking][38165]
4118 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4119 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4120 iteration or reallocation.
4121 - [Simplified HashMap Bucket interface][40561] provides performance
4122 improvements for iterating and cloning.
4123 - [Specialize Vec::from_elem to use calloc][40409]
4124 - [Fixed Race condition in fs::create_dir_all][39799]
4125 - [No longer caching stdio on Windows][40516]
4126 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4127 2.50%~ faster and in one case now 12.50% faster.
4128 - [Optimized `AtomicBool::fetch_nand`][41143]
4133 - [`Child::try_wait`]
4134 - [`HashMap::retain`]
4135 - [`HashSet::retain`]
4137 - [`TcpStream::peek`]
4138 - [`UdpSocket::peek`]
4139 - [`UdpSocket::peek_from`]
4144 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4145 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4146 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4147 - [Added Android build support][cargo/3885]
4148 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4149 of a certain type, for example `cargo build --bins` will build all
4151 - [Added support for haiku][cargo/3952]
4156 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4157 - [Added rust-windbg script for better debugging on Windows][39983]
4158 - [Rust now uses the official cross compiler for NetBSD][40612]
4159 - [rustdoc now accepts `#` at the start of files][40828]
4160 - [Fixed jemalloc support for musl][41168]
4165 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4166 always placed after the sign if it exists and before the digits. With the `#`
4167 flag the zeroes are placed after the prefix and before the digits.
4168 - [Due to the struct field optimisation][40377], using `transmute` on structs
4169 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4170 always been undefined behavior, but is now more likely to break in practice.
4171 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4172 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4173 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4174 - [Overlapping inherent `impl`s are now a hard error][40728]
4175 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4176 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4177 `out.asm` and `out.ll` instead of only one of the filetypes.
4178 - [ calling a function that returns `Self` will no longer work][41805] when
4179 the size of `Self` cannot be statically determined.
4180 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4181 this has caused a few regressions namely:
4183 - Changed the link order of local static/dynamic libraries (respecting the
4184 order on given rather than having the compiler reorder).
4185 - Changed how MinGW is linked, native code linked to dynamic libraries
4186 may require manually linking to the gcc support library (for the native
4189 [38165]: https://github.com/rust-lang/rust/pull/38165
4190 [39799]: https://github.com/rust-lang/rust/pull/39799
4191 [39891]: https://github.com/rust-lang/rust/pull/39891
4192 [39983]: https://github.com/rust-lang/rust/pull/39983
4193 [40043]: https://github.com/rust-lang/rust/pull/40043
4194 [40241]: https://github.com/rust-lang/rust/pull/40241
4195 [40338]: https://github.com/rust-lang/rust/pull/40338
4196 [40367]: https://github.com/rust-lang/rust/pull/40367
4197 [40377]: https://github.com/rust-lang/rust/pull/40377
4198 [40409]: https://github.com/rust-lang/rust/pull/40409
4199 [40516]: https://github.com/rust-lang/rust/pull/40516
4200 [40556]: https://github.com/rust-lang/rust/pull/40556
4201 [40561]: https://github.com/rust-lang/rust/pull/40561
4202 [40589]: https://github.com/rust-lang/rust/pull/40589
4203 [40612]: https://github.com/rust-lang/rust/pull/40612
4204 [40723]: https://github.com/rust-lang/rust/pull/40723
4205 [40728]: https://github.com/rust-lang/rust/pull/40728
4206 [40731]: https://github.com/rust-lang/rust/pull/40731
4207 [40734]: https://github.com/rust-lang/rust/pull/40734
4208 [40805]: https://github.com/rust-lang/rust/pull/40805
4209 [40807]: https://github.com/rust-lang/rust/pull/40807
4210 [40828]: https://github.com/rust-lang/rust/pull/40828
4211 [40870]: https://github.com/rust-lang/rust/pull/40870
4212 [41085]: https://github.com/rust-lang/rust/pull/41085
4213 [41143]: https://github.com/rust-lang/rust/pull/41143
4214 [41168]: https://github.com/rust-lang/rust/pull/41168
4215 [41270]: https://github.com/rust-lang/rust/issues/41270
4216 [41469]: https://github.com/rust-lang/rust/pull/41469
4217 [41805]: https://github.com/rust-lang/rust/issues/41805
4218 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4219 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4220 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4221 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4222 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4223 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4224 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4225 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4226 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4227 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4228 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4229 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4230 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4231 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4234 Version 1.17.0 (2017-04-27)
4235 ===========================
4240 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4241 * [Fields of structs may be initialized without duplicating the field/variable
4242 names][39761]. [RFC 1682]
4243 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4244 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4245 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4246 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4247 `'b`. Soundness fix.
4248 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4249 * [Static variables may contain references to other statics][40027]
4254 * [Exit quickly on only `--emit dep-info`][40336]
4255 * [Make `-C relocation-model` more correctly determine whether the linker
4256 creates a position-independent executable][40245]
4257 * [Add `-C overflow-checks` to directly control whether integer overflow
4259 * [The rustc type checker now checks items on demand instead of in a single
4260 in-order pass][40008]. This is mostly an internal refactoring in support of
4261 future work, including incremental type checking, but also resolves [RFC
4262 1647], allowing `Self` to appear in `impl` `where` clauses.
4263 * [Optimize vtable loads][39995]
4264 * [Turn off vectorization for Emscripten targets][39990]
4265 * [Provide suggestions for unknown macros imported with `use`][39953]
4266 * [Fix ICEs in path resolution][39939]
4267 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4268 * [Add clearer error message using `&str + &str`][39116]
4279 * [`Ordering::then`]
4280 * [`Ordering::then_with`]
4281 * [`BTreeMap::range`]
4282 * [`BTreeMap::range_mut`]
4283 * [`collections::Bound`]
4284 * [`process::abort`]
4285 * [`ptr::read_unaligned`]
4286 * [`ptr::write_unaligned`]
4287 * [`Result::expect_err`]
4290 * [`Cell::into_inner`]
4296 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4297 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4298 * [`String` implements `FromIterator<&char>`][40028]
4299 * `Box` [implements][40009] a number of new conversions:
4300 `From<Box<str>> for String`,
4301 `From<Box<[T]>> for Vec<T>`,
4302 `From<Box<CStr>> for CString`,
4303 `From<Box<OsStr>> for OsString`,
4304 `From<Box<Path>> for PathBuf`,
4305 `Into<Box<str>> for String`,
4306 `Into<Box<[T]>> for Vec<T>`,
4307 `Into<Box<CStr>> for CString`,
4308 `Into<Box<OsStr>> for OsString`,
4309 `Into<Box<Path>> for PathBuf`,
4310 `Default for Box<str>`,
4311 `Default for Box<CStr>`,
4312 `Default for Box<OsStr>`,
4313 `From<&CStr> for Box<CStr>`,
4314 `From<&OsStr> for Box<OsStr>`,
4315 `From<&Path> for Box<Path>`
4316 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4317 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4318 * [Slightly optimize `slice::sort`][39538]
4319 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4320 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4321 `Box<str>` implements `From<&str>`][39438]
4322 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4323 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4324 * [`format!` estimates the needed capacity before writing a string][39356]
4325 * [Support unprivileged symlink creation in Windows][38921]
4326 * [`PathBuf` implements `Default`][38764]
4327 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4328 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4329 and poor hash functions.
4334 * [Add `cargo check --all`][cargo/3731]
4335 * [Add an option to ignore SSL revocation checking][cargo/3699]
4336 * [Add `cargo run --package`][cargo/3691]
4337 * [Add `required_features`][cargo/3667]
4338 * [Assume `build.rs` is a build script][cargo/3664]
4339 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4344 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4346 * [The "Unstable Book" documents nightly-only features][ubook]
4347 * [Improve the style of the sidebar in rustdoc output][40265]
4348 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4349 * [Fix MSP430 breakage due to `i128`][40257]
4350 * [Preliminary Solaris/SPARCv9 support][39903]
4351 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4352 run without installing the MSVC runtime.
4353 * [`rustdoc --test` includes file names in test names][39788]
4354 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4355 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4356 * [Initial support for `aarch64-unknown-freebsd`][39491]
4357 * [Initial support for `i686-unknown-netbsd`][39426]
4358 * [This release no longer includes the old makefile build system][39431]. Rust
4359 is built with a custom build system, written in Rust, and with Cargo.
4360 * [Add Debug implementations for libcollection structs][39002]
4361 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4362 * [`--test-threads=0` produces an error][38945]
4363 * [`rustup` installs documentation by default][40526]
4364 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4365 WinDbg and Visual Studio to improve the debugging experience.
4370 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4371 workaround, either use MSVC 2015 or run vcvars.bat.
4372 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4373 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4374 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4376 * [`format!` and `Display::to_string` panic if an underlying formatting
4377 implementation returns an error][40117]. Previously the error was silently
4378 ignored. It is incorrect for `write_fmt` to return an error when writing
4380 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4381 crates were marked stable and could be accessed from the stable toolchain.
4382 * [Rust git source no longer includes vendored crates][39728]. Those that need
4383 to build with vendored crates should build from release tarballs.
4384 * [Fix inert attributes from `proc_macro_derives`][39572]
4385 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4386 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4388 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4389 existing code generally ignores the type of dead-code unless a type-hint is
4390 provided; this can cause surprising inference interactions particularly around
4391 defaulting. The new code uniformly ignores the result type of dead-code.
4392 * [Tuple-struct constructors with private fields are no longer visible][38932]
4393 * [Lifetime parameters that do not appear in the arguments are now considered
4394 early-bound][38897], resolving a soundness bug (#[32330]). The
4395 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4397 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4398 * [Make transmuting from fn item types to pointer-sized types a hard
4401 [27787]: https://github.com/rust-lang/rust/issues/27787
4402 [32330]: https://github.com/rust-lang/rust/issues/32330
4403 [34198]: https://github.com/rust-lang/rust/pull/34198
4404 [38161]: https://github.com/rust-lang/rust/pull/38161
4405 [38368]: https://github.com/rust-lang/rust/pull/38368
4406 [38584]: https://github.com/rust-lang/rust/issues/38584
4407 [38661]: https://github.com/rust-lang/rust/pull/38661
4408 [38764]: https://github.com/rust-lang/rust/pull/38764
4409 [38864]: https://github.com/rust-lang/rust/issues/38864
4410 [38897]: https://github.com/rust-lang/rust/pull/38897
4411 [38921]: https://github.com/rust-lang/rust/pull/38921
4412 [38932]: https://github.com/rust-lang/rust/pull/38932
4413 [38945]: https://github.com/rust-lang/rust/pull/38945
4414 [38981]: https://github.com/rust-lang/rust/pull/38981
4415 [39002]: https://github.com/rust-lang/rust/pull/39002
4416 [39116]: https://github.com/rust-lang/rust/pull/39116
4417 [39193]: https://github.com/rust-lang/rust/pull/39193
4418 [39265]: https://github.com/rust-lang/rust/pull/39265
4419 [39356]: https://github.com/rust-lang/rust/pull/39356
4420 [39372]: https://github.com/rust-lang/rust/pull/39372
4421 [39426]: https://github.com/rust-lang/rust/pull/39426
4422 [39431]: https://github.com/rust-lang/rust/pull/39431
4423 [39438]: https://github.com/rust-lang/rust/pull/39438
4424 [39440]: https://github.com/rust-lang/rust/pull/39440
4425 [39485]: https://github.com/rust-lang/rust/pull/39485
4426 [39491]: https://github.com/rust-lang/rust/pull/39491
4427 [39518]: https://github.com/rust-lang/rust/pull/39518
4428 [39538]: https://github.com/rust-lang/rust/pull/39538
4429 [39572]: https://github.com/rust-lang/rust/pull/39572
4430 [39633]: https://github.com/rust-lang/rust/pull/39633
4431 [39642]: https://github.com/rust-lang/rust/pull/39642
4432 [39728]: https://github.com/rust-lang/rust/pull/39728
4433 [39761]: https://github.com/rust-lang/rust/pull/39761
4434 [39788]: https://github.com/rust-lang/rust/pull/39788
4435 [39793]: https://github.com/rust-lang/rust/pull/39793
4436 [39837]: https://github.com/rust-lang/rust/pull/39837
4437 [39843]: https://github.com/rust-lang/rust/pull/39843
4438 [39851]: https://github.com/rust-lang/rust/pull/39851
4439 [39903]: https://github.com/rust-lang/rust/pull/39903
4440 [39939]: https://github.com/rust-lang/rust/pull/39939
4441 [39953]: https://github.com/rust-lang/rust/pull/39953
4442 [39960]: https://github.com/rust-lang/rust/pull/39960
4443 [39990]: https://github.com/rust-lang/rust/pull/39990
4444 [39995]: https://github.com/rust-lang/rust/pull/39995
4445 [40008]: https://github.com/rust-lang/rust/pull/40008
4446 [40009]: https://github.com/rust-lang/rust/pull/40009
4447 [40027]: https://github.com/rust-lang/rust/pull/40027
4448 [40028]: https://github.com/rust-lang/rust/pull/40028
4449 [40037]: https://github.com/rust-lang/rust/pull/40037
4450 [40117]: https://github.com/rust-lang/rust/pull/40117
4451 [40166]: https://github.com/rust-lang/rust/pull/40166
4452 [40245]: https://github.com/rust-lang/rust/pull/40245
4453 [40257]: https://github.com/rust-lang/rust/pull/40257
4454 [40261]: https://github.com/rust-lang/rust/pull/40261
4455 [40265]: https://github.com/rust-lang/rust/pull/40265
4456 [40319]: https://github.com/rust-lang/rust/pull/40319
4457 [40336]: https://github.com/rust-lang/rust/pull/40336
4458 [40526]: https://github.com/rust-lang/rust/pull/40526
4459 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4460 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4461 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4462 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4463 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4464 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4465 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4466 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4467 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4468 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4469 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4470 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4471 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4472 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4473 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4474 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4475 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4476 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4477 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4478 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4479 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4480 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4481 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4482 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4483 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4484 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4485 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4486 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4487 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4488 [mdbook]: https://crates.io/crates/mdbook
4489 [ubook]: https://doc.rust-lang.org/unstable-book/
4492 Version 1.16.0 (2017-03-16)
4493 ===========================
4498 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4499 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4500 match patterns][38069]
4501 * [Clean up semantics of `self` in an import list][38313]
4502 * [`Self` may appear in `impl` headers][38920]
4503 * [`Self` may appear in struct expressions][39282]
4508 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4509 a `.rmeta` file containing only crate metadata][38571]. This can be
4510 used by tools like the Rust Language Service to perform
4511 metadata-only builds.
4512 * [Levenshtein based typo suggestions now work in most places, while
4513 previously they worked only for fields and sometimes for local
4514 variables][38927]. Together with the overhaul of "no
4515 resolution"/"unexpected resolution" errors (#[38154]) they result in
4516 large and systematic improvement in resolution diagnostics.
4517 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4519 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4520 * [`rustc` no longer attempts to provide "consider using an explicit
4521 lifetime" suggestions][37057]. They were inaccurate.
4526 * [`VecDeque::truncate`]
4527 * [`VecDeque::resize`]
4528 * [`String::insert_str`]
4529 * [`Duration::checked_add`]
4530 * [`Duration::checked_sub`]
4531 * [`Duration::checked_div`]
4532 * [`Duration::checked_mul`]
4535 * [`SocketAddr::is_ipv4`]
4536 * [`SocketAddr::is_ipv6`]
4537 * [`IpAddr::is_ipv4`]
4538 * [`IpAddr::is_ipv6`]
4540 * [`Vec::dedup_by_key`]
4541 * [`Result::unwrap_or_default`]
4542 * [`<*const T>::wrapping_offset`]
4543 * [`<*mut T>::wrapping_offset`]
4544 * `CommandExt::creation_flags`
4545 * [`File::set_permissions`]
4546 * [`String::split_off`]
4551 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4552 their argument by `Borrow` parameter][37761]
4553 * [All public types in std implement `Debug`][38006]
4554 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4555 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4556 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4558 * [std: Fix partial writes in `LineWriter`][38062]
4559 * [std: Clamp max read/write sizes on Unix][38062]
4560 * [Use more specific panic message for `&str` slicing errors][38066]
4561 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4562 functionality cannot be achieved in std currently.
4563 * [`writeln!`, like `println!`, now accepts a form with no string
4564 or formatting arguments, to just print a newline][38469]
4565 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4566 * [Reduce the size of static data in `std_unicode::tables`][38781]
4567 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4568 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4570 * [`Duration` implements `Sum`][38712]
4571 * [`String` implements `ToSocketAddrs`][39048]
4576 * [The `cargo check` command does a type check of a project without
4577 building it][cargo/3296]
4578 * [crates.io will display CI badges from Travis and AppVeyor, if
4579 specified in Cargo.toml][cargo/3546]
4580 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4581 * [Compilation profiles accept integer values for `debug`, in addition
4582 to `true` and `false`. These are passed to `rustc` as the value to
4583 `-C debuginfo`][cargo/3534]
4584 * [Implement `cargo --version --verbose`][cargo/3604]
4585 * [All builds now output 'dep-info' build dependencies compatible with
4586 make and ninja][cargo/3557]
4587 * [Build all workspace members with `build --all`][cargo/3511]
4588 * [Document all workspace members with `doc --all`][cargo/3515]
4589 * [Path deps outside workspace are not members][cargo/3443]
4594 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4595 the path to the Rust implementation][38589]
4596 * [The `armv7-linux-androideabi` target no longer enables NEON
4597 extensions, per Google's ABI guide][38413]
4598 * [The stock standard library can be compiled for Redox OS][38401]
4599 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4601 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4603 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4608 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4609 match patterns][38069]
4610 * In this release, references to uninhabited types can not be
4611 pattern-matched. This was accidentally allowed in 1.15.
4612 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4613 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4615 * [Clean up semantics of `self` in an import list][38313]
4616 * Reimplemented lifetime elision. This change was almost entirely compatible
4617 with existing code, but it did close a number of small bugs and loopholes,
4618 as well as being more accepting in some other [cases][41105].
4620 [37057]: https://github.com/rust-lang/rust/pull/37057
4621 [37761]: https://github.com/rust-lang/rust/pull/37761
4622 [38006]: https://github.com/rust-lang/rust/pull/38006
4623 [38051]: https://github.com/rust-lang/rust/pull/38051
4624 [38062]: https://github.com/rust-lang/rust/pull/38062
4625 [38062]: https://github.com/rust-lang/rust/pull/38622
4626 [38066]: https://github.com/rust-lang/rust/pull/38066
4627 [38069]: https://github.com/rust-lang/rust/pull/38069
4628 [38131]: https://github.com/rust-lang/rust/pull/38131
4629 [38154]: https://github.com/rust-lang/rust/pull/38154
4630 [38274]: https://github.com/rust-lang/rust/pull/38274
4631 [38304]: https://github.com/rust-lang/rust/pull/38304
4632 [38313]: https://github.com/rust-lang/rust/pull/38313
4633 [38314]: https://github.com/rust-lang/rust/pull/38314
4634 [38327]: https://github.com/rust-lang/rust/pull/38327
4635 [38401]: https://github.com/rust-lang/rust/pull/38401
4636 [38413]: https://github.com/rust-lang/rust/pull/38413
4637 [38469]: https://github.com/rust-lang/rust/pull/38469
4638 [38559]: https://github.com/rust-lang/rust/pull/38559
4639 [38571]: https://github.com/rust-lang/rust/pull/38571
4640 [38580]: https://github.com/rust-lang/rust/pull/38580
4641 [38589]: https://github.com/rust-lang/rust/pull/38589
4642 [38670]: https://github.com/rust-lang/rust/pull/38670
4643 [38712]: https://github.com/rust-lang/rust/pull/38712
4644 [38726]: https://github.com/rust-lang/rust/pull/38726
4645 [38781]: https://github.com/rust-lang/rust/pull/38781
4646 [38798]: https://github.com/rust-lang/rust/pull/38798
4647 [38909]: https://github.com/rust-lang/rust/pull/38909
4648 [38920]: https://github.com/rust-lang/rust/pull/38920
4649 [38927]: https://github.com/rust-lang/rust/pull/38927
4650 [39048]: https://github.com/rust-lang/rust/pull/39048
4651 [39282]: https://github.com/rust-lang/rust/pull/39282
4652 [39379]: https://github.com/rust-lang/rust/pull/39379
4653 [41105]: https://github.com/rust-lang/rust/issues/41105
4654 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4655 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4656 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4657 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4658 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4659 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4660 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4661 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4662 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4663 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4664 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4665 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4666 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4667 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4668 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4669 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4670 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4671 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4672 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4673 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4674 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4675 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4676 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4677 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4678 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4679 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4680 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4681 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4682 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4683 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4686 Version 1.15.1 (2017-02-09)
4687 ===========================
4689 * [Fix IntoIter::as_mut_slice's signature][39466]
4690 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4692 [39466]: https://github.com/rust-lang/rust/pull/39466
4693 [39523]: https://github.com/rust-lang/rust/pull/39523
4696 Version 1.15.0 (2017-02-02)
4697 ===========================
4702 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4703 stable. This allows popular code-generating crates like Serde and Diesel to
4704 work ergonomically. [RFC 1681].
4705 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4706 with curly braces][36868]. Part of [RFC 1506].
4707 * [A number of minor changes to name resolution have been activated][37127].
4708 They add up to more consistent semantics, allowing for future evolution of
4709 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4710 details of what is different. The breaking changes here have been transitioned
4711 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4712 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4714 * [`?Sized` can be used in `where` clauses][37791]
4715 * [There is now a limit on the size of monomorphized types and it can be
4716 modified with the `#![type_size_limit]` crate attribute, similarly to
4717 the `#![recursion_limit]` attribute][37789]
4722 * [On Windows, the compiler will apply dllimport attributes when linking to
4723 extern functions][37973]. Additional attributes and flags can control which
4724 library kind is linked and its name. [RFC 1717].
4725 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4726 * [The `--test` flag works with procedural macro crates][38107]
4727 * [Fix `extern "aapcs" fn` ABI][37814]
4728 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4729 * [The `format!` expander recognizes incorrect `printf` and shell-style
4730 formatting directives and suggests the correct format][37613].
4731 * [Only report one error for all unused imports in an import list][37456]
4733 Compiler Performance
4734 --------------------
4736 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4737 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4738 * [Don't clone in `UnificationTable::probe`][37848]
4739 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4740 * [Use small vectors in type walker][37760]
4741 * [Macro expansion performance was improved][37701]
4742 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4743 * [Replace FNV with a faster hash function][37229]
4748 * [`std::iter::Iterator::min_by`]
4749 * [`std::iter::Iterator::max_by`]
4750 * [`std::os::*::fs::FileExt`]
4751 * [`std::sync::atomic::Atomic*::get_mut`]
4752 * [`std::sync::atomic::Atomic*::into_inner`]
4753 * [`std::vec::IntoIter::as_slice`]
4754 * [`std::vec::IntoIter::as_mut_slice`]
4755 * [`std::sync::mpsc::Receiver::try_iter`]
4756 * [`std::os::unix::process::CommandExt::before_exec`]
4757 * [`std::rc::Rc::strong_count`]
4758 * [`std::rc::Rc::weak_count`]
4759 * [`std::sync::Arc::strong_count`]
4760 * [`std::sync::Arc::weak_count`]
4761 * [`std::char::encode_utf8`]
4762 * [`std::char::encode_utf16`]
4763 * [`std::cell::Ref::clone`]
4764 * [`std::io::Take::into_inner`]
4769 * [The standard sorting algorithm has been rewritten for dramatic performance
4770 improvements][38192]. It is a hybrid merge sort, drawing influences from
4771 Timsort. Previously it was a naive merge sort.
4772 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4773 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4775 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4776 and `char_indices().last()`][37882]
4777 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4778 * [Chinese characters display correctly in `fmt::Debug`][37855]
4779 * [Derive `Default` for `Duration`][37699]
4780 * [Support creation of anonymous pipes on WinXP/2k][37677]
4781 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4782 * [Don't pass overlapped handles to processes][38835]
4787 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4788 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4789 should instead check the variable at runtime with `std::env`. That the value
4790 was set at build time was a bug, and incorrect when cross-compiling. This
4791 change is known to cause breakage.
4792 * [Add `--all` flag to `cargo test`][cargo/3221]
4793 * [Compile statically against the MSVC CRT][cargo/3363]
4794 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4795 * [Link OpenSSL statically on OSX][cargo/3311]
4796 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4797 * [Test for bad path overrides with summaries][cargo/3336]
4798 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4799 * [Fix retrying crate downloads for network errors][cargo/3348]
4800 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4801 * [Emit more info on --message-format=json][cargo/3319]
4802 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4803 * [Don't ignore errors in workspace manifest][cargo/3409]
4804 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4809 * [Test runners (binaries built with `--test`) now support a `--list` argument
4810 that lists the tests it contains][38185]
4811 * [Test runners now support a `--exact` argument that makes the test filter
4812 match exactly, instead of matching only a substring of the test name][38181]
4813 * [rustdoc supports a `--playground-url` flag][37763]
4814 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4819 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4820 continue to be used in this release by passing `--disable-rustbuild` to the
4821 configure script, but they will be deleted soon. Note that the new build
4822 system uses a different on-disk layout that will likely affect any scripts
4824 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4826 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4827 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4833 * [A number of minor changes to name resolution have been activated][37127].
4834 They add up to more consistent semantics, allowing for future evolution of
4835 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4836 details of what is different. The breaking changes here have been transitioned
4837 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4838 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4839 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4840 should instead check the variable at runtime with `std::env`. That the value
4841 was set at build time was a bug, and incorrect when cross-compiling. This
4842 change is known to cause breakage.
4843 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4844 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4845 1.10 and is now an error by default. It will become a hard error in the near
4847 * [The semantics relating modules to file system directories are changing in
4848 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4849 lint, which is a warning in this release, and will become a hard error in the
4851 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4852 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4853 the underlying iterator][37834]
4855 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4856 [33685]: https://github.com/rust-lang/rust/issues/33685
4857 [36868]: https://github.com/rust-lang/rust/pull/36868
4858 [37127]: https://github.com/rust-lang/rust/pull/37127
4859 [37229]: https://github.com/rust-lang/rust/pull/37229
4860 [37456]: https://github.com/rust-lang/rust/pull/37456
4861 [37527]: https://github.com/rust-lang/rust/pull/37527
4862 [37602]: https://github.com/rust-lang/rust/pull/37602
4863 [37613]: https://github.com/rust-lang/rust/pull/37613
4864 [37615]: https://github.com/rust-lang/rust/pull/37615
4865 [37636]: https://github.com/rust-lang/rust/pull/37636
4866 [37627]: https://github.com/rust-lang/rust/pull/37627
4867 [37642]: https://github.com/rust-lang/rust/pull/37642
4868 [37677]: https://github.com/rust-lang/rust/pull/37677
4869 [37699]: https://github.com/rust-lang/rust/pull/37699
4870 [37701]: https://github.com/rust-lang/rust/pull/37701
4871 [37705]: https://github.com/rust-lang/rust/pull/37705
4872 [37749]: https://github.com/rust-lang/rust/pull/37749
4873 [37760]: https://github.com/rust-lang/rust/pull/37760
4874 [37763]: https://github.com/rust-lang/rust/pull/37763
4875 [37764]: https://github.com/rust-lang/rust/pull/37764
4876 [37789]: https://github.com/rust-lang/rust/pull/37789
4877 [37791]: https://github.com/rust-lang/rust/pull/37791
4878 [37814]: https://github.com/rust-lang/rust/pull/37814
4879 [37817]: https://github.com/rust-lang/rust/pull/37817
4880 [37834]: https://github.com/rust-lang/rust/pull/37834
4881 [37848]: https://github.com/rust-lang/rust/pull/37848
4882 [37855]: https://github.com/rust-lang/rust/pull/37855
4883 [37882]: https://github.com/rust-lang/rust/pull/37882
4884 [37888]: https://github.com/rust-lang/rust/pull/37888
4885 [37973]: https://github.com/rust-lang/rust/pull/37973
4886 [37979]: https://github.com/rust-lang/rust/pull/37979
4887 [38086]: https://github.com/rust-lang/rust/pull/38086
4888 [38107]: https://github.com/rust-lang/rust/pull/38107
4889 [38117]: https://github.com/rust-lang/rust/pull/38117
4890 [38134]: https://github.com/rust-lang/rust/pull/38134
4891 [38146]: https://github.com/rust-lang/rust/pull/38146
4892 [38181]: https://github.com/rust-lang/rust/pull/38181
4893 [38182]: https://github.com/rust-lang/rust/pull/38182
4894 [38185]: https://github.com/rust-lang/rust/pull/38185
4895 [38192]: https://github.com/rust-lang/rust/pull/38192
4896 [38279]: https://github.com/rust-lang/rust/pull/38279
4897 [38835]: https://github.com/rust-lang/rust/pull/38835
4898 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4899 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4900 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4901 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4902 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4903 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4904 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4905 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4906 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4907 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4908 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4909 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4910 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4911 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4912 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4913 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4914 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4915 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4916 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4917 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4918 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4919 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4920 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4921 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4922 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4923 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4924 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4925 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4926 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4927 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4928 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4929 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4930 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4931 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4932 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4933 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4934 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4935 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4938 Version 1.14.0 (2016-12-22)
4939 ===========================
4944 * [`..` matches multiple tuple fields in enum variants, structs
4945 and tuples][36843]. [RFC 1492].
4946 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4947 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4948 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4949 dereferencing][36822]
4954 * [Mark enums with non-zero discriminant as non-zero][37224]
4955 * [Lower-case `static mut` names are linted like other
4956 statics and consts][37162]
4957 * [Fix ICE on some macros in const integer positions
4958 (e.g. `[u8; m!()]`)][36819]
4959 * [Improve error message and snippet for "did you mean `x`"][36798]
4960 * [Add a panic-strategy field to the target specification][36794]
4961 * [Include LLVM version in `--version --verbose`][37200]
4963 Compile-time Optimizations
4964 --------------------------
4966 * [Improve macro expansion performance][37569]
4967 * [Shrink `Expr_::ExprInlineAsm`][37445]
4968 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4969 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4970 * [Avoid more allocations when compiling html5ever][37373]
4971 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4972 * [Avoid some allocations in the macro parser][37318]
4973 * [Use a faster deflate setting][37298]
4974 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4975 during interning of slices][37270]
4976 * [Optimize `write_metadata`][37267]
4977 * [Don't process obligation forest cycles when stalled][37231]
4978 * [Avoid many `CrateConfig` clones][37161]
4979 * [Optimize `Substs::super_fold_with`][37108]
4980 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4981 * [Speed up `plug_leaks`][36917]
4986 * [`println!()`, with no arguments, prints newline][36825].
4987 Previously, an empty string was required to achieve the same.
4988 * [`Wrapping` impls standard binary and unary operators, as well as
4989 the `Sum` and `Product` iterators][37356]
4990 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4992 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4993 `VecDeque` iterators][37315]
4994 * [Improve `SipHasher` performance on small values][37312]
4995 * [Add Iterator trait TrustedLen to enable better FromIterator /
4997 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4998 * [`ReadDir` implements `Debug`][37221]
4999 * [Implement `RefUnwindSafe` for atomic types][37178]
5000 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5001 * [Avoid allocations in `Decoder::read_str`][37064]
5002 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5003 * [Impl `Debug` for raw pointers to unsized data][36880]
5004 * [Don't reuse `HashMap` random seeds][37470]
5005 * [The internal memory layout of `HashMap` is more cache-friendly, for
5006 significant improvements in some operations][36692]
5007 * [`HashMap` uses less memory on 32-bit architectures][36595]
5008 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5013 * [Expose rustc cfg values to build scripts][cargo/3243]
5014 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5015 * [Fix passing --features when testing multiple packages][cargo/3280]
5016 * [Use a single profile set per workspace][cargo/3249]
5017 * [Load `replace` sections from lock files][cargo/3220]
5018 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5023 * [rustup is the recommended Rust installation method][1.14rustup]
5024 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5025 S390x. These are [tier 2] platforms and may have major defects. Follow the
5026 instructions on the website to install, or add the targets to an existing
5027 installation with `rustup target add`. The new target triples are:
5028 - `mips-unknown-linux-gnu`
5029 - `mipsel-unknown-linux-gnu`
5030 - `mips64-unknown-linux-gnuabi64`
5031 - `mips64el-unknown-linux-gnuabi64 `
5032 - `powerpc-unknown-linux-gnu`
5033 - `powerpc64-unknown-linux-gnu`
5034 - `powerpc64le-unknown-linux-gnu`
5035 - `s390x-unknown-linux-gnu `
5036 * This release includes target (std) builds for ARM Linux running MUSL
5037 libc. These are [tier 2] platforms and may have major defects. Add the
5038 following triples to an existing rustup installation with `rustup target add`:
5039 - `arm-unknown-linux-musleabi`
5040 - `arm-unknown-linux-musleabihf`
5041 - `armv7-unknown-linux-musleabihf`
5042 * This release includes [experimental support for WebAssembly][1.14wasm], via
5043 the `wasm32-unknown-emscripten` target. This target is known to have major
5044 defects. Please test, report, and fix.
5045 * rustup no longer installs documentation by default. Run `rustup
5046 component add rust-docs` to install.
5047 * [Fix line stepping in debugger][37310]
5048 * [Enable line number debuginfo in releases][37280]
5053 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5054 * [Add support for Fuchsia OS][37313]
5055 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5060 * [A number of forward-compatibility lints used by the compiler
5061 to gradually introduce language changes have been converted
5062 to deny by default][36894]:
5063 - ["use of inaccessible extern crate erroneously allowed"][36886]
5064 - ["type parameter default erroneously allowed in invalid location"][36887]
5065 - ["detects super or self keywords at the beginning of global path"][36888]
5066 - ["two overlapping inherent impls define an item with the same name
5067 were erroneously allowed"][36889]
5068 - ["floating-point constants cannot be used in patterns"][36890]
5069 - ["constants of struct or enum type can only be used in a pattern if
5070 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5071 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5072 * [Prohibit patterns in trait methods without bodies][37378]
5073 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5074 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5075 * [The `$crate` macro variable is accepted in fewer locations][37213]
5076 * [Impls specifying extra region requirements beyond the trait
5077 they implement are rejected][37167]
5078 * [Enums may not be unsized][37111]. Unsized enums are intended to
5079 work but never have. For now they are forbidden.
5080 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5082 [tier 2]: https://forge.rust-lang.org/platform-support.html
5083 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5084 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5085 [36430]: https://github.com/rust-lang/rust/pull/36430
5086 [36595]: https://github.com/rust-lang/rust/pull/36595
5087 [36595]: https://github.com/rust-lang/rust/pull/36595
5088 [36692]: https://github.com/rust-lang/rust/pull/36692
5089 [36767]: https://github.com/rust-lang/rust/pull/36767
5090 [36794]: https://github.com/rust-lang/rust/pull/36794
5091 [36798]: https://github.com/rust-lang/rust/pull/36798
5092 [36819]: https://github.com/rust-lang/rust/pull/36819
5093 [36822]: https://github.com/rust-lang/rust/pull/36822
5094 [36825]: https://github.com/rust-lang/rust/pull/36825
5095 [36843]: https://github.com/rust-lang/rust/pull/36843
5096 [36880]: https://github.com/rust-lang/rust/pull/36880
5097 [36886]: https://github.com/rust-lang/rust/issues/36886
5098 [36887]: https://github.com/rust-lang/rust/issues/36887
5099 [36888]: https://github.com/rust-lang/rust/issues/36888
5100 [36889]: https://github.com/rust-lang/rust/issues/36889
5101 [36890]: https://github.com/rust-lang/rust/issues/36890
5102 [36891]: https://github.com/rust-lang/rust/issues/36891
5103 [36892]: https://github.com/rust-lang/rust/issues/36892
5104 [36894]: https://github.com/rust-lang/rust/pull/36894
5105 [36917]: https://github.com/rust-lang/rust/pull/36917
5106 [36993]: https://github.com/rust-lang/rust/pull/36993
5107 [37037]: https://github.com/rust-lang/rust/pull/37037
5108 [37064]: https://github.com/rust-lang/rust/pull/37064
5109 [37094]: https://github.com/rust-lang/rust/pull/37094
5110 [37108]: https://github.com/rust-lang/rust/pull/37108
5111 [37111]: https://github.com/rust-lang/rust/pull/37111
5112 [37161]: https://github.com/rust-lang/rust/pull/37161
5113 [37162]: https://github.com/rust-lang/rust/pull/37162
5114 [37167]: https://github.com/rust-lang/rust/pull/37167
5115 [37178]: https://github.com/rust-lang/rust/pull/37178
5116 [37200]: https://github.com/rust-lang/rust/pull/37200
5117 [37213]: https://github.com/rust-lang/rust/pull/37213
5118 [37221]: https://github.com/rust-lang/rust/pull/37221
5119 [37224]: https://github.com/rust-lang/rust/pull/37224
5120 [37230]: https://github.com/rust-lang/rust/pull/37230
5121 [37231]: https://github.com/rust-lang/rust/pull/37231
5122 [37247]: https://github.com/rust-lang/rust/pull/37247
5123 [37267]: https://github.com/rust-lang/rust/pull/37267
5124 [37270]: https://github.com/rust-lang/rust/pull/37270
5125 [37273]: https://github.com/rust-lang/rust/pull/37273
5126 [37280]: https://github.com/rust-lang/rust/pull/37280
5127 [37298]: https://github.com/rust-lang/rust/pull/37298
5128 [37306]: https://github.com/rust-lang/rust/pull/37306
5129 [37310]: https://github.com/rust-lang/rust/pull/37310
5130 [37312]: https://github.com/rust-lang/rust/pull/37312
5131 [37313]: https://github.com/rust-lang/rust/pull/37313
5132 [37315]: https://github.com/rust-lang/rust/pull/37315
5133 [37318]: https://github.com/rust-lang/rust/pull/37318
5134 [37322]: https://github.com/rust-lang/rust/pull/37322
5135 [37326]: https://github.com/rust-lang/rust/pull/37326
5136 [37351]: https://github.com/rust-lang/rust/pull/37351
5137 [37356]: https://github.com/rust-lang/rust/pull/37356
5138 [37367]: https://github.com/rust-lang/rust/pull/37367
5139 [37373]: https://github.com/rust-lang/rust/pull/37373
5140 [37378]: https://github.com/rust-lang/rust/pull/37378
5141 [37389]: https://github.com/rust-lang/rust/pull/37389
5142 [37392]: https://github.com/rust-lang/rust/pull/37392
5143 [37427]: https://github.com/rust-lang/rust/pull/37427
5144 [37439]: https://github.com/rust-lang/rust/pull/37439
5145 [37445]: https://github.com/rust-lang/rust/pull/37445
5146 [37470]: https://github.com/rust-lang/rust/pull/37470
5147 [37569]: https://github.com/rust-lang/rust/pull/37569
5148 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5149 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5150 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5151 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5152 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5153 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5154 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5157 Version 1.13.0 (2016-11-10)
5158 ===========================
5163 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5164 errors, like the `try!` macro, described in [RFC 0243].
5165 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5166 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5167 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5168 * [Fix lifetime rules for 'if' conditions][36029]
5169 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5174 * [Add the `-C link-arg` argument][36574]
5175 * [Remove the old AST-based backend from rustc_trans][35764]
5176 * [Don't enable NEON by default on armv7 Linux][35814]
5177 * [Fix debug line number info for macro expansions][35238]
5178 * [Do not emit "class method" debuginfo for types that are not
5179 DICompositeType][36008]
5180 * [Warn about multiple conflicting #[repr] hints][34623]
5181 * [When sizing DST, don't double-count nested struct prefixes][36351]
5182 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5183 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5184 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5185 * [Expand macros without recursing to avoid stack overflows][36214]
5190 * [Replace macro backtraces with labeled local uses][35702]
5191 * [Improve error message for misplaced doc comments][33922]
5192 * [Buffer unix and lock windows to prevent message interleaving][35975]
5193 * [Update lifetime errors to specifically note temporaries][36171]
5194 * [Special case a few colors for Windows][36178]
5195 * [Suggest `use self` when such an import resolves][36289]
5196 * [Be more specific when type parameter shadows primitive type][36338]
5197 * Many minor improvements
5199 Compile-time Optimizations
5200 --------------------------
5202 * [Compute and cache HIR hashes at beginning][35854]
5203 * [Don't hash types in loan paths][36004]
5204 * [Cache projections in trans][35761]
5205 * [Optimize the parser's last token handling][36527]
5206 * [Only instantiate #[inline] functions in codegen units referencing
5207 them][36524]. This leads to big improvements in cases where crates export
5208 define many inline functions without using them directly.
5209 * [Lazily allocate TypedArena's first chunk][36592]
5210 * [Don't allocate during default HashSet creation][36734]
5217 * [`overflowing_abs`]
5218 * [`RefCell::try_borrow`]
5219 * [`RefCell::try_borrow_mut`]
5224 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5225 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5227 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5228 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5229 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5230 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5231 * [Use arc4rand on FreeBSD][35884]
5232 * [memrchr: Correct aligned offset computation][35969]
5233 * [Improve Demangling of Rust Symbols][36059]
5234 * [Use monotonic time in condition variables][35048]
5235 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5236 * [Implement conversion traits for `char`][35755]
5237 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5238 * [Zero first byte of CString on drop][36264]
5239 * [Inherit overflow checks for sum and product][36372]
5240 * [Add missing Eq implementations][36423]
5241 * [Implement `Debug` for `DirEntry`][36631]
5242 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5244 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5245 * [Implement more traits for `std::io::ErrorKind`][35911]
5246 * [Optimize BinaryHeap bounds checking][36072]
5247 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5248 `extend_with_element`][36355]
5249 * [Fix overflow checking in unsigned pow()][34942]
5254 * This release includes security fixes to both curl and OpenSSL.
5255 * [Fix transitive doctests when panic=abort][cargo/3021]
5256 * [Add --all-features flag to cargo][cargo/3038]
5257 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5258 * [Don't parse the home directory more than once][cargo/3078]
5259 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5260 * [Update OpenSSL to 1.0.2j][cargo/3121]
5261 * [Add license and license_file to cargo metadata output][cargo/3110]
5262 * [Make crates-io registry URL optional in config; ignore all changes to
5263 source.crates-io][cargo/3089]
5264 * [Don't download dependencies from other platforms][cargo/3123]
5265 * [Build transitive dev-dependencies when needed][cargo/3125]
5266 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5267 * [Avoid updating registry when adding existing deps][cargo/3144]
5268 * [Warn about path overrides that won't work][cargo/3136]
5269 * [Use workspaces during `cargo install`][cargo/3146]
5270 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5271 * [Add --message-format flag][cargo/3000]
5272 * [Pass target environment for rustdoc][cargo/3205]
5273 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5274 * [Update curl and curl-sys][cargo/3241]
5275 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5280 * [rustdoc: Add the `--sysroot` argument][36586]
5281 * [rustdoc: Fix a couple of issues with the search results][35655]
5282 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5283 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5284 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5289 * [Remove unmaintained style guide][35124]
5290 * [Add s390x support][36369]
5291 * [Initial work at Haiku OS support][36727]
5292 * [Add mips-uclibc targets][35734]
5293 * [Crate-ify compiler-rt into compiler-builtins][35021]
5294 * [Add rustc version info (git hash + date) to dist tarball][36213]
5295 * Many documentation improvements
5300 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5301 * [Deny (by default) transmuting from fn item types to pointer-sized
5302 types][34923]. Continuing the long transition to zero-sized fn items,
5304 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5306 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5307 * [Fix lifetime rules for 'if' conditions][36029].
5308 * [Inherit overflow checks for sum and product][36372].
5309 * [Forbid user-defined macros named "macro_rules"][36730].
5311 [33922]: https://github.com/rust-lang/rust/pull/33922
5312 [34623]: https://github.com/rust-lang/rust/pull/34623
5313 [34923]: https://github.com/rust-lang/rust/pull/34923
5314 [34942]: https://github.com/rust-lang/rust/pull/34942
5315 [34982]: https://github.com/rust-lang/rust/pull/34982
5316 [35021]: https://github.com/rust-lang/rust/pull/35021
5317 [35048]: https://github.com/rust-lang/rust/pull/35048
5318 [35074]: https://github.com/rust-lang/rust/pull/35074
5319 [35124]: https://github.com/rust-lang/rust/pull/35124
5320 [35234]: https://github.com/rust-lang/rust/pull/35234
5321 [35238]: https://github.com/rust-lang/rust/pull/35238
5322 [35354]: https://github.com/rust-lang/rust/pull/35354
5323 [35559]: https://github.com/rust-lang/rust/pull/35559
5324 [35585]: https://github.com/rust-lang/rust/pull/35585
5325 [35627]: https://github.com/rust-lang/rust/pull/35627
5326 [35655]: https://github.com/rust-lang/rust/pull/35655
5327 [35702]: https://github.com/rust-lang/rust/pull/35702
5328 [35707]: https://github.com/rust-lang/rust/pull/35707
5329 [35728]: https://github.com/rust-lang/rust/pull/35728
5330 [35734]: https://github.com/rust-lang/rust/pull/35734
5331 [35755]: https://github.com/rust-lang/rust/pull/35755
5332 [35761]: https://github.com/rust-lang/rust/pull/35761
5333 [35764]: https://github.com/rust-lang/rust/pull/35764
5334 [35814]: https://github.com/rust-lang/rust/pull/35814
5335 [35854]: https://github.com/rust-lang/rust/pull/35854
5336 [35871]: https://github.com/rust-lang/rust/pull/35871
5337 [35884]: https://github.com/rust-lang/rust/pull/35884
5338 [35911]: https://github.com/rust-lang/rust/pull/35911
5339 [35969]: https://github.com/rust-lang/rust/pull/35969
5340 [35975]: https://github.com/rust-lang/rust/pull/35975
5341 [36004]: https://github.com/rust-lang/rust/pull/36004
5342 [36008]: https://github.com/rust-lang/rust/pull/36008
5343 [36014]: https://github.com/rust-lang/rust/pull/36014
5344 [36029]: https://github.com/rust-lang/rust/pull/36029
5345 [36059]: https://github.com/rust-lang/rust/pull/36059
5346 [36072]: https://github.com/rust-lang/rust/pull/36072
5347 [36101]: https://github.com/rust-lang/rust/pull/36101
5348 [36104]: https://github.com/rust-lang/rust/pull/36104
5349 [36171]: https://github.com/rust-lang/rust/pull/36171
5350 [36173]: https://github.com/rust-lang/rust/pull/36173
5351 [36178]: https://github.com/rust-lang/rust/pull/36178
5352 [36213]: https://github.com/rust-lang/rust/pull/36213
5353 [36214]: https://github.com/rust-lang/rust/pull/36214
5354 [36264]: https://github.com/rust-lang/rust/pull/36264
5355 [36266]: https://github.com/rust-lang/rust/pull/36266
5356 [36289]: https://github.com/rust-lang/rust/pull/36289
5357 [36338]: https://github.com/rust-lang/rust/pull/36338
5358 [36351]: https://github.com/rust-lang/rust/pull/36351
5359 [36355]: https://github.com/rust-lang/rust/pull/36355
5360 [36369]: https://github.com/rust-lang/rust/pull/36369
5361 [36372]: https://github.com/rust-lang/rust/pull/36372
5362 [36423]: https://github.com/rust-lang/rust/pull/36423
5363 [36482]: https://github.com/rust-lang/rust/pull/36482
5364 [36505]: https://github.com/rust-lang/rust/pull/36505
5365 [36524]: https://github.com/rust-lang/rust/pull/36524
5366 [36527]: https://github.com/rust-lang/rust/pull/36527
5367 [36551]: https://github.com/rust-lang/rust/pull/36551
5368 [36574]: https://github.com/rust-lang/rust/pull/36574
5369 [36586]: https://github.com/rust-lang/rust/pull/36586
5370 [36592]: https://github.com/rust-lang/rust/pull/36592
5371 [36631]: https://github.com/rust-lang/rust/pull/36631
5372 [36639]: https://github.com/rust-lang/rust/pull/36639
5373 [36721]: https://github.com/rust-lang/rust/pull/36721
5374 [36727]: https://github.com/rust-lang/rust/pull/36727
5375 [36730]: https://github.com/rust-lang/rust/pull/36730
5376 [36734]: https://github.com/rust-lang/rust/pull/36734
5377 [36754]: https://github.com/rust-lang/rust/pull/36754
5378 [36995]: https://github.com/rust-lang/rust/pull/36995
5379 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5380 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5381 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5382 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5383 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5384 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5385 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5386 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5387 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5388 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5389 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5390 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5391 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5392 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5393 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5394 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5395 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5396 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5397 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5398 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5399 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5400 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5401 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5402 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5403 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5404 [rustup]: https://www.rustup.rs
5405 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5406 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5407 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5408 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5409 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5410 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5411 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5414 Version 1.12.1 (2016-10-20)
5415 ===========================
5420 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5421 * [Confusion with double negation and booleans][36856]
5422 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5423 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5424 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5425 * [Corrupted memory after updated to 1.12][36936]
5426 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5427 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5428 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5430 [36381]: https://github.com/rust-lang/rust/issues/36381
5431 [36856]: https://github.com/rust-lang/rust/issues/36856
5432 [36875]: https://github.com/rust-lang/rust/issues/36875
5433 [36924]: https://github.com/rust-lang/rust/issues/36924
5434 [36926]: https://github.com/rust-lang/rust/issues/36926
5435 [36936]: https://github.com/rust-lang/rust/issues/36936
5436 [37026]: https://github.com/rust-lang/rust/issues/37026
5437 [37112]: https://github.com/rust-lang/rust/issues/37112
5438 [37153]: https://github.com/rust-lang/rust/issues/37153
5441 Version 1.12.0 (2016-09-29)
5442 ===========================
5447 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5448 This translation pass is far simpler than the previous AST->LLVM pass, and
5449 creates opportunities to perform new optimizations directly on the MIR. It
5450 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5451 * [`rustc` presents a new, more readable error format, along with
5452 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5453 Most common editors supporting Rust have been updated to work with it. It was
5454 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5459 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5460 This translation pass is far simpler than the previous AST->LLVM pass, and
5461 creates opportunities to perform new optimizations directly on the MIR. It
5462 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5463 * [Print the Rust target name, not the LLVM target name, with
5464 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5465 * [The computation of `TypeId` is correct in some cases where it was previously
5466 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5467 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5468 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5469 `--print relocation-models`, and `--print code-models` print the available
5470 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5471 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5472 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5473 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5474 These targets produce statically-linked binaries. There are no binary release
5480 * [`rustc` presents a new, more readable error format, along with
5481 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5482 Most common editors supporting Rust have been updated to work with it. It was
5483 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5484 * [In error descriptions, references are now described in plain English,
5485 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5486 * [In error type descriptions, unknown numeric types are named `{integer}` or
5487 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5488 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5493 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5494 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5495 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5496 useful](https://github.com/rust-lang/rust/pull/34908)
5497 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5498 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5499 * [Semicolons are properly required as statement delimiters inside
5500 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5501 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5506 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5507 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5508 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5509 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5510 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5511 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5512 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5513 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5514 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5515 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5516 Both on Unix and Windows.
5517 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5518 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5519 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5520 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5521 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5522 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5523 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5524 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5529 * [The `format!` macro and friends now allow a single argument to be formatted
5530 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5531 * [The lifetime bounds on `[T]::binary_search_by` and
5532 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5533 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5534 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5535 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5536 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5537 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5538 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5539 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5540 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5541 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5542 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5543 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5544 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5545 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5546 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5547 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5548 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5549 * [`mpsc::sync_channel` `Receiver`s return any available message before
5550 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5551 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5552 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5557 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5558 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5559 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5560 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5561 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5562 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5563 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5564 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5565 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5566 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5567 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5568 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5569 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5570 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5571 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5572 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5577 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5578 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5583 * [Test binaries now support a `--test-threads` argument to specify the number
5584 of threads used to run tests, and which acts the same as the
5585 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5586 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5587 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5588 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5589 * [Rust releases now come with source packages that can be installed by rustup
5590 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5591 The resulting source code can be used by tools and IDES, located in the
5592 sysroot under `lib/rustlib/src`.
5597 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5598 * Many minor improvements to the documentation.
5599 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5604 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5605 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5606 * [When formatting strings, if "precision" is specified, the "fill",
5607 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5608 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5611 Version 1.11.0 (2016-08-18)
5612 ===========================
5617 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5618 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5619 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5620 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5625 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5626 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5627 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5628 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5629 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5630 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5631 (in libcore - previously stabilized in libstd)
5632 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5633 (in libcore - previously stabilized in libstd)
5634 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5635 (in libcore - previously stabilized in libstd)
5636 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5637 (in libcore - previously stabilized in libstd)
5638 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5639 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5640 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5641 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5646 * [The `thread_local!` macro supports multiple definitions in a single
5647 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5648 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5649 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5650 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5651 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5652 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5653 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5654 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5659 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5660 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5661 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5662 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5663 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5664 and `-vv` prints warnings for all crates.
5665 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5666 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5667 This provides room for expansion by arbitrary tools.
5668 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5669 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5670 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5671 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5672 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5673 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5674 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5679 * [Caching projections speeds up type check dramatically for some
5680 workloads](https://github.com/rust-lang/rust/pull/33816)
5681 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5682 This hasher is faster, but is believed to provide sufficient
5683 protection from collision attacks.
5684 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5689 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5690 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5691 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5692 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5693 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5698 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5699 * [When emitting debug info, rustc emits frame pointers for closures,
5700 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5701 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5702 * Many more errors have been given error codes and extended
5704 * API documentation continues to be improved, with many new examples
5709 * [rustc no longer hangs when dependencies recursively re-export
5710 submodules](https://github.com/rust-lang/rust/pull/34542)
5711 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5712 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5713 rewritten](https://github.com/rust-lang/rust/pull/33895)
5714 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5715 No targets use this yet, but it works toward AVR support.
5720 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5721 * [The new follow-set rules that place restrictions on `macro_rules!`
5722 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5723 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5724 and has been a warning since 1.10.
5725 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5726 This causes breakage in some corner cases.
5729 Version 1.10.0 (2016-07-07)
5730 ===========================
5735 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5736 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5737 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5738 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5739 * [`panic!` can be converted to a runtime abort with the
5740 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5741 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5742 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5743 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5744 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5745 Note that Cargo does not yet directly support cdylibs.
5750 * `os::windows::fs::OpenOptionsExt::access_mode`
5751 * `os::windows::fs::OpenOptionsExt::share_mode`
5752 * `os::windows::fs::OpenOptionsExt::custom_flags`
5753 * `os::windows::fs::OpenOptionsExt::attributes`
5754 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5755 * `os::unix::fs::OpenOptionsExt::custom_flags`
5756 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5757 * `Default for sync::Weak`
5758 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5759 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5760 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5761 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5762 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5763 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5764 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5765 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5766 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5767 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5768 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5769 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5770 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5771 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5772 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5773 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5774 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5775 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5776 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5777 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5778 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5779 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5780 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5781 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5782 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5783 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5784 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5785 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5786 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5787 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5788 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5789 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5790 * Read/Write/RawFd impls for `UnixStream`
5791 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5792 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5793 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5794 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5795 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5796 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5797 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5798 * RawFd impls for `UnixListener`
5799 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5800 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5801 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5802 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5803 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5804 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5805 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5806 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5807 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5808 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5809 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5810 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5811 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5812 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5813 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5814 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5815 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5816 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5817 * RawFd impls for `UnixDatagram`
5818 * `{BTree,Hash}Map::values_mut`
5819 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5824 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5825 The semantics of this minor method are subtle and probably not what
5827 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5828 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5829 will fall back to `/dev/urandom` temporarily to avoid blocking
5830 during early boot](https://github.com/rust-lang/rust/pull/33086).
5831 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5832 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5833 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5834 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5835 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5836 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5837 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5841 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5842 This controls the runtime behavior of the `panic!` macro
5843 and can be either "unwind" (the default), or "abort".
5844 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5845 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5846 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5847 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5848 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5849 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5850 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5851 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5852 By default they are retried twice, which can be customized with the
5853 `net.retry` value in `.cargo/config`.
5854 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5855 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5856 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5857 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5858 Makes it possible to install multiple crates in parallel.
5859 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5860 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5861 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5862 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5863 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5864 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5869 * [rustc memory usage was reduced by refactoring the context used for
5870 type checking](https://github.com/rust-lang/rust/pull/33425).
5871 * [Speed up creation of `HashMap`s by caching the random keys used
5872 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5873 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5874 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5875 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5876 10x faster than the previous lookup tables.
5877 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5882 * Many incremental improvements to documentation and rustdoc.
5883 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5884 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5885 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5886 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5887 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5888 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5889 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5894 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5895 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5896 * [`std` no longer prints backtraces on platforms where the running
5897 module must be loaded with `env::current_exe`, which can't be relied
5898 on](https://github.com/rust-lang/rust/pull/33554).
5899 * This release includes std binaries for the i586-unknown-linux-gnu,
5900 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5901 i586 target is for old x86 hardware without SSE2, and the armv7
5902 target is for Android running on modern ARM architectures.
5903 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5904 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5905 * [On Unix the runtime aborts by calling `libc::abort` instead of
5906 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5907 * [Rust is now bootstrapped from the previous release of Rust,
5908 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5913 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5914 * [`target_env` for Linux ARM targets is just `gnu`, not
5915 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5916 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5917 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5918 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5919 Affects how macros are parsed.
5920 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5921 * [Feature-gated attributes on macro-generated macro invocations are
5922 now rejected](https://github.com/rust-lang/rust/pull/32791).
5923 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5924 This caused some minor changes to type inference.
5927 Version 1.9.0 (2016-05-26)
5928 ==========================
5933 * The `#[deprecated]` attribute when applied to an API will generate
5934 warnings when used. The warnings may be suppressed with
5935 `#[allow(deprecated)]`. [RFC 1270].
5936 * [`fn` item types are zero sized, and each `fn` names a unique
5937 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5938 `transmute` on a `fn` type will generate a warning for a few cycles,
5939 then will be converted to an error.
5940 * [Field and method resolution understand visibility, so private
5941 fields and methods cannot prevent the proper use of public fields
5942 and methods][1.9fv].
5943 * [The parser considers unicode codepoints in the
5944 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5950 * [`std::panic::catch_unwind`] (renamed from `recover`)
5951 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5952 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5953 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5954 * [`str::is_char_boundary`]
5955 * [`<*const T>::as_ref`]
5956 * [`<*mut T>::as_ref`]
5957 * [`<*mut T>::as_mut`]
5958 * [`AsciiExt::make_ascii_uppercase`]
5959 * [`AsciiExt::make_ascii_lowercase`]
5960 * [`char::decode_utf16`]
5961 * [`char::DecodeUtf16`]
5962 * [`char::DecodeUtf16Error`]
5963 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5964 * [`BTreeSet::take`]
5965 * [`BTreeSet::replace`]
5968 * [`HashSet::replace`]
5970 * [`OsString::with_capacity`]
5971 * [`OsString::clear`]
5972 * [`OsString::capacity`]
5973 * [`OsString::reserve`]
5974 * [`OsString::reserve_exact`]
5975 * [`OsStr::is_empty`]
5977 * [`std::os::unix::thread`]
5980 * [`JoinHandleExt::as_pthread_t`]
5981 * [`JoinHandleExt::into_pthread_t`]
5982 * [`HashSet::hasher`]
5983 * [`HashMap::hasher`]
5984 * [`CommandExt::exec`]
5985 * [`File::try_clone`]
5986 * [`SocketAddr::set_ip`]
5987 * [`SocketAddr::set_port`]
5988 * [`SocketAddrV4::set_ip`]
5989 * [`SocketAddrV4::set_port`]
5990 * [`SocketAddrV6::set_ip`]
5991 * [`SocketAddrV6::set_port`]
5992 * [`SocketAddrV6::set_flowinfo`]
5993 * [`SocketAddrV6::set_scope_id`]
5994 * [`slice::copy_from_slice`]
5995 * [`ptr::read_volatile`]
5996 * [`ptr::write_volatile`]
5997 * [`OpenOptions::create_new`]
5998 * [`TcpStream::set_nodelay`]
5999 * [`TcpStream::nodelay`]
6000 * [`TcpStream::set_ttl`]
6001 * [`TcpStream::ttl`]
6002 * [`TcpStream::set_only_v6`]
6003 * [`TcpStream::only_v6`]
6004 * [`TcpStream::take_error`]
6005 * [`TcpStream::set_nonblocking`]
6006 * [`TcpListener::set_ttl`]
6007 * [`TcpListener::ttl`]
6008 * [`TcpListener::set_only_v6`]
6009 * [`TcpListener::only_v6`]
6010 * [`TcpListener::take_error`]
6011 * [`TcpListener::set_nonblocking`]
6012 * [`UdpSocket::set_broadcast`]
6013 * [`UdpSocket::broadcast`]
6014 * [`UdpSocket::set_multicast_loop_v4`]
6015 * [`UdpSocket::multicast_loop_v4`]
6016 * [`UdpSocket::set_multicast_ttl_v4`]
6017 * [`UdpSocket::multicast_ttl_v4`]
6018 * [`UdpSocket::set_multicast_loop_v6`]
6019 * [`UdpSocket::multicast_loop_v6`]
6020 * [`UdpSocket::set_multicast_ttl_v6`]
6021 * [`UdpSocket::multicast_ttl_v6`]
6022 * [`UdpSocket::set_ttl`]
6023 * [`UdpSocket::ttl`]
6024 * [`UdpSocket::set_only_v6`]
6025 * [`UdpSocket::only_v6`]
6026 * [`UdpSocket::join_multicast_v4`]
6027 * [`UdpSocket::join_multicast_v6`]
6028 * [`UdpSocket::leave_multicast_v4`]
6029 * [`UdpSocket::leave_multicast_v6`]
6030 * [`UdpSocket::take_error`]
6031 * [`UdpSocket::connect`]
6032 * [`UdpSocket::send`]
6033 * [`UdpSocket::recv`]
6034 * [`UdpSocket::set_nonblocking`]
6039 * [`std::sync::Once` is poisoned if its initialization function
6041 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6042 * [Most types implement `fmt::Debug`][1.9db].
6043 * [The default buffer size used by `BufReader` and `BufWriter` was
6044 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6045 used by other languages.
6046 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6047 `Duration` additionally implements `*=` and `/=`][1.9ta].
6048 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6049 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6050 * [`Chain` implements `BufRead`][1.9ch].
6051 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6056 * [Cargo can now run concurrently][1.9cc].
6057 * [Top-level overrides allow specific revisions of crates to be
6058 overridden through the entire crate graph][1.9ct]. This is intended
6059 to make upgrades easier for large projects, by allowing crates to be
6060 forked temporarily until they've been upgraded and republished.
6061 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6062 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6063 on the commandline][1.9cf]. `rustc` arguments can also be specified
6064 in the `build.rustflags` configuration key.
6069 * [The time complexity of comparing variables for equivalence during type
6070 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6071 to major compilation time improvement in some scenarios.
6072 * [`ToString` is specialized for `str`, giving it the same performance
6073 as `to_owned`][1.9ts].
6074 * [Spawning processes with `Command::output` no longer creates extra
6076 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6077 for C-like enums][1.9cl].
6082 * [Passing the `--quiet` flag to a test runner will produce
6083 much-abbreviated output][1.9q].
6084 * The Rust Project now publishes std binaries for the
6085 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6086 `i586-pc-windows-msvc` targets.
6091 * [`std::sync::Once` is poisoned if its initialization function
6093 * [It is illegal to define methods with the same name in overlapping
6094 inherent `impl` blocks][1.9sn].
6095 * [`fn` item types are zero sized, and each `fn` names a unique
6096 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6097 `transmute` on a `fn` type will generate a warning for a few cycles,
6098 then will be converted to an error.
6099 * [Improvements to const evaluation may trigger new errors when integer
6100 literals are out of range][1.9ce].
6103 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6104 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6105 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6106 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6107 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6108 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6109 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6110 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6111 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6112 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6113 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6114 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6115 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6116 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6117 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6118 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6119 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6120 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6121 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6122 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6123 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6124 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6125 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6126 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6127 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6128 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6129 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6130 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6131 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6132 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6133 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6134 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6135 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6136 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6137 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6138 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6139 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6140 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6141 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6142 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6143 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6144 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6145 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6146 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6147 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6148 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6149 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6150 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6151 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6152 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6153 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6154 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6155 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6156 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6157 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6158 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6159 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6160 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6161 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6162 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6163 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6164 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6165 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6166 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6167 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6168 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6169 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6170 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6171 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6172 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6173 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6174 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6175 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6176 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6177 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6178 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6179 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6180 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6181 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6182 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6183 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6184 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6185 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6186 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6187 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6188 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6189 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6190 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6191 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6192 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6193 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6194 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6195 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6196 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6197 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6198 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6199 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6200 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6201 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6202 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6203 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6204 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6205 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6206 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6207 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6208 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6209 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6210 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6211 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6212 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6215 Version 1.8.0 (2016-04-14)
6216 ==========================
6221 * Rust supports overloading of compound assignment statements like
6222 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6223 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6224 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6226 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6227 addition to the non-braced form, `struct Foo;`. [RFC 218].
6233 * [`str::encode_utf16`] (renamed from `utf16_units`)
6234 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6237 * [`ptr::drop_in_place`]
6239 * [`time::SystemTime`]
6241 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6242 * [`Instant::elapsed`]
6243 * [`SystemTime::now`]
6244 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6245 * [`SystemTime::elapsed`]
6246 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6247 * [`SystemTimeError`]
6248 * [`SystemTimeError::duration`]
6249 * Various impls for `SystemTimeError`
6251 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6252 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6253 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6254 * [The `write!` and `writeln!` macros correctly emit errors if any of
6255 their arguments can't be formatted][1.8w].
6256 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6257 * [The Unix-specific `raw` modules, which contain a number of
6258 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6259 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6260 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6261 across platforms was making it difficult to implement `std`
6262 correctly. Those that need these definitions should use the `libc`
6264 * The Unix-specific `MetadataExt` traits, including
6265 `os::unix::fs::MetadataExt`, which expose values such as inode
6266 numbers [no longer return platform-specific types][1.8r], but
6267 instead return widened integers. [RFC 1415].
6268 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6269 * [Atomic loads and stores are not volatile][1.8a].
6270 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6275 * [Inlining hash functions lead to a 3% compile-time improvement in
6276 some workloads][1.8h].
6277 * When using jemalloc, its symbols are [unprefixed so that it
6278 overrides the libc malloc implementation][1.8h]. This means that for
6279 rustc, LLVM is now using jemalloc, which results in a 6%
6280 compile-time improvement on a specific workload.
6281 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6286 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6287 i686-pc-windows-msvc is now considered a tier-1 platform.
6288 * [The `--print targets` flag prints a list of supported targets][1.8t].
6289 * [The `--print cfg` flag prints the `cfg`s defined for the current
6291 * [`rustc` can be built with an new Cargo-based build system, written
6292 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6293 build system. To enable it configure with `configure --rustbuild`.
6294 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6295 variants while also indicating the total number of missing variants
6296 if more than 3][1.8m].
6297 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6298 * The Rust Project now publishes binary releases of the standard
6299 library for a number of tier-2 targets:
6300 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6301 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6302 `x86_64-rumprun-netbsd`. These can be installed with
6303 tools such as [multirust][1.8mr].
6308 * [`cargo init` creates a new Cargo project in the current
6309 directory][1.8ci]. It is otherwise like `cargo new`.
6310 * [Cargo has configuration keys for `-v` and
6311 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6312 `[term]` section of `.cargo/config`.
6313 * [Configuration keys that evaluate to strings or integers can be set
6314 via environment variables][1.8ce]. For example the `build.jobs` key
6315 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6316 precedence over config files.
6317 * [Target-specific dependencies support Rust `cfg` syntax for
6318 describing targets][1.8cfg] so that dependencies for multiple
6319 targets can be specified together. [RFC 1361].
6320 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6321 `RUSTDOC` take precedence over the `build.target-dir`,
6322 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6323 * [The child process tree is killed on Windows when Cargo is
6325 * [The `build.target` configuration value sets the target platform,
6326 like `--target`][1.8ct].
6331 * [Unstable compiler flags have been further restricted][1.8u]. Since
6332 1.0 `-Z` flags have been considered unstable, and other flags that
6333 were considered unstable additionally required passing `-Z
6334 unstable-options` to access. Unlike unstable language and library
6335 features though, these options have been accessible on the stable
6336 release channel. Going forward, *new unstable flags will not be
6337 available on the stable release channel*, and old unstable flags
6338 will warn about their usage. In the future, all unstable flags will
6339 be unavailable on the stable release channel.
6340 * [It is no longer possible to `match` on empty enum variants using
6341 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6342 * The Unix-specific `MetadataExt` traits, including
6343 `os::unix::fs::MetadataExt`, which expose values such as inode
6344 numbers [no longer return platform-specific types][1.8r], but
6345 instead return widened integers. [RFC 1415].
6346 * [Modules sourced from the filesystem cannot appear within arbitrary
6347 blocks, but only within other modules][1.8mf].
6348 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6349 * On Unix, [stack overflow triggers a runtime abort instead of a
6351 * [`Command::spawn` and its equivalents return an error if any of
6352 its command-line arguments contain interior `NUL`s][1.8n].
6353 * [Tuple and unit enum variants from other crates are in the type
6355 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6356 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6357 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6358 instead of `foo.lib`.
6361 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6362 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6363 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6364 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6365 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6366 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6367 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6368 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6369 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6370 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6371 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6372 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6373 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6374 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6375 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6376 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6377 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6378 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6379 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6380 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6381 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6382 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6383 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6384 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6385 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6386 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6387 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6388 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6389 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6390 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6391 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6392 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6393 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6394 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6395 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6396 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6397 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6398 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6399 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6400 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6401 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6402 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6403 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6404 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6405 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6406 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6407 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6408 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6409 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6410 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6411 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6412 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6413 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6414 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6415 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6416 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6417 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6418 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6419 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6420 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6423 Version 1.7.0 (2016-03-03)
6424 ==========================
6431 * [`Path::strip_prefix`] (renamed from relative_from)
6432 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6434 * [`Ipv4Addr::is_loopback`]
6435 * [`Ipv4Addr::is_private`]
6436 * [`Ipv4Addr::is_link_local`]
6437 * [`Ipv4Addr::is_multicast`]
6438 * [`Ipv4Addr::is_broadcast`]
6439 * [`Ipv4Addr::is_documentation`]
6441 * [`Ipv6Addr::is_unspecified`]
6442 * [`Ipv6Addr::is_loopback`]
6443 * [`Ipv6Addr::is_multicast`]
6446 * [`Vec::as_mut_slice`]
6448 * [`String::as_str`]
6449 * [`String::as_mut_str`]
6451 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6453 * `<[T]>::`[`sort_by_key`]
6454 * checked, saturated, and overflowing operations
6455 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6456 * [`i32::saturating_mul`]
6457 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6458 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6459 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6460 * [`u32::saturating_mul`]
6461 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6462 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6463 * and checked, saturated, and overflowing operations for other primitive types
6465 * [`ffi::IntoStringError`]
6466 * [`CString::into_string`]
6467 * [`CString::into_bytes`]
6468 * [`CString::into_bytes_with_nul`]
6469 * `From<CString> for Vec<u8>`
6471 * [`IntoStringError::into_cstring`]
6472 * [`IntoStringError::utf8_error`]
6473 * `Error for IntoStringError`
6475 * [`std::hash::BuildHasher`]
6476 * [`BuildHasher::Hasher`]
6477 * [`BuildHasher::build_hasher`]
6478 * [`std::hash::BuildHasherDefault`]
6479 * [`HashMap::with_hasher`]
6480 * [`HashMap::with_capacity_and_hasher`]
6481 * [`HashSet::with_hasher`]
6482 * [`HashSet::with_capacity_and_hasher`]
6483 * [`std::collections::hash_map::RandomState`]
6484 * [`RandomState::new`]
6485 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6486 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6487 from bytes is faster.
6488 * [The performance of `LineWriter` (and thus `io::stdout`) was
6489 improved by using `memchr` to search for newlines][1.7m].
6490 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6491 `f64` variants were stabilized previously.
6492 * [`BTreeMap` was rewritten to use less memory and improve the performance
6493 of insertion and iteration, the latter by as much as 5x][1.7bm].
6494 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6495 covariant over their contained type][1.7bt].
6496 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6497 over their contained type][1.7ll].
6498 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6500 * [`Any` is implemented for unsized types][1.7a].
6501 * [`Hash` is implemented for `Duration`][1.7h].
6506 * [When running tests with `--test`, rustdoc will pass `--cfg`
6507 arguments to the compiler][1.7dt].
6508 * [The compiler is built with RPATH information by default][1.7rpa].
6509 This means that it will be possible to run `rustc` when installed in
6510 unusual configurations without configuring the dynamic linker search
6512 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6513 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6514 over `LD_LIBRARY_PATH`.
6519 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6520 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6521 * [The `rerun-if-changed` build script directive no longer causes the
6522 build script to incorrectly run twice in certain scenarios][1.7rr].
6527 * Soundness fixes to the interactions between associated types and
6528 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6529 code that violates the new rules. This is a significant change that
6530 is known to break existing code, so it has emitted warnings for the
6531 new error cases since 1.4 to give crate authors time to adapt. The
6532 details of what is changing are subtle; read the RFC for more.
6533 * [Several bugs in the compiler's visibility calculations were
6534 fixed][1.7v]. Since this was found to break significant amounts of
6535 code, the new errors will be emitted as warnings for several release
6536 cycles, under the `private_in_public` lint.
6537 * Defaulted type parameters were accidentally accepted in positions
6538 that were not intended. In this release, [defaulted type parameters
6539 appearing outside of type definitions will generate a
6540 warning][1.7d], which will become an error in future releases.
6541 * [Parsing "." as a float results in an error instead of 0][1.7p].
6542 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6543 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6545 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6546 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6547 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6548 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6549 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6550 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6551 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6552 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6553 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6554 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6555 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6556 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6557 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6558 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6559 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6560 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6561 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6562 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6563 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6564 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6565 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6566 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6567 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6568 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6569 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6570 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6571 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6572 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6573 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6574 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6575 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6576 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6577 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6578 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6579 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6580 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6581 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6582 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6583 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6584 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6585 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6586 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6587 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6588 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6589 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6590 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6591 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6592 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6593 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6594 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6595 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6596 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6597 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6598 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6599 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6600 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6601 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6602 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6603 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6604 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6605 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6606 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6607 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6608 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6609 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6610 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6611 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6612 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6613 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6614 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6615 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6616 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6617 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6618 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6619 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6620 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6621 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6622 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6623 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6626 Version 1.6.0 (2016-01-21)
6627 ==========================
6632 * The `#![no_std]` attribute causes a crate to not be linked to the
6633 standard library, but only the [core library][1.6co], as described
6634 in [RFC 1184]. The core library defines common types and traits but
6635 has no platform dependencies whatsoever, and is the basis for Rust
6636 software in environments that cannot support a full port of the
6637 standard library, such as operating systems. Most of the core
6638 library is now stable.
6644 [`Read::read_exact`],
6645 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6646 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6647 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6648 [`os::unix::fs::DirBuilderExt`],
6649 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6650 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6651 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6652 [`collections::hash_map::Drain`],
6653 [`collections::hash_map::HashMap::drain`],
6654 [`collections::hash_set::Drain`],
6655 [`collections::hash_set::HashSet::drain`],
6656 [`collections::binary_heap::Drain`],
6657 [`collections::binary_heap::BinaryHeap::drain`],
6658 [`Vec::extend_from_slice`] (renamed from `push_all`),
6659 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6660 [`RwLock::into_inner`],
6661 [`Iterator::min_by_key`] (renamed from `min_by`),
6662 [`Iterator::max_by_key`] (renamed from `max_by`).
6663 * The [core library][1.6co] is stable, as are most of its APIs.
6664 * [The `assert_eq!` macro supports arguments that don't implement
6665 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6667 * Several timer functions that take duration in milliseconds [are
6668 deprecated in favor of those that take `Duration`][1.6ms]. These
6669 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6670 `thread::park_timeout_ms`.
6671 * The algorithm by which `Vec` reserves additional elements was
6672 [tweaked to not allocate excessive space][1.6a] while still growing
6674 * `From` conversions are [implemented from integers to floats][1.6f]
6675 in cases where the conversion is lossless. Thus they are not
6676 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6677 or `f64`. They are also not implemented for `isize` and `usize`
6678 because the implementations would be platform-specific. `From` is
6679 also implemented from `f32` to `f64`.
6680 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6681 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6682 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6683 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6685 * Sorting slices that are already sorted [is 50% faster in some
6691 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6692 * Cargo build scripts can specify their dependencies by emitting the
6693 [`rerun-if-changed`][1.6rr] key.
6694 * crates.io will reject publication of crates with dependencies that
6695 have a wildcard version constraint. Crates with wildcard
6696 dependencies were seen to cause a variety of problems, as described
6697 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6699 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6700 release folder. A variety of artifacts that Cargo failed to clean
6701 are now correctly deleted.
6706 * The `unreachable_code` lint [warns when a function call's argument
6708 * The parser indicates [failures that may be caused by
6709 confusingly-similar Unicode characters][1.6uc]
6710 * Certain macro errors [are reported at definition time][1.6m], not
6716 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6717 environment variable when locating crates. This was a pre-cargo
6718 feature for integrating with the package manager that was
6719 accidentally never removed.
6720 * [A number of bugs were fixed in the privacy checker][1.6p] that
6721 could cause previously-accepted code to break.
6722 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6723 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6724 struct pattern syntax (`Foo(..)`) can no longer be used to match
6725 unit structs. This is a warning now, but will become an error in
6726 future releases. Patterns that share the same name as a const are
6728 * A bug was fixed that causes [rustc not to apply default type
6729 parameters][1.6xc] when resolving certain method implementations of
6730 traits defined in other crates.
6732 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6733 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6734 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6735 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6736 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6737 [1.6co]: http://doc.rust-lang.org/core/index.html
6738 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6739 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6740 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6741 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6742 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6743 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6744 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6745 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6746 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6747 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6748 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6749 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6750 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6751 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6752 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6753 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6754 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6755 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6756 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6757 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6758 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6759 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6760 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6761 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6762 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6763 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6764 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6765 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6766 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6767 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6768 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6769 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6770 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6771 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6772 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6773 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6774 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6775 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6776 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6777 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6778 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6781 Version 1.5.0 (2015-12-10)
6782 ==========================
6784 * ~700 changes, numerous bugfixes
6790 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6791 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6792 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6793 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6794 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6795 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6796 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6797 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6798 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6799 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6800 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6801 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6802 [`Path::read_link`], [`Path::symlink_metadata`],
6803 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6804 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6805 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6806 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6807 [`slice::split_first_mut`], [`slice::split_first`],
6808 [`slice::split_last_mut`], [`slice::split_last`],
6809 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6810 [`str::MatchIndices`], [`str::RMatchIndices`],
6811 [`str::match_indices`], [`str::rmatch_indices`],
6812 [`str::slice_mut_unchecked`], [`string::ParseError`].
6813 * Rust applications hosted on crates.io can be installed locally to
6814 `~/.cargo/bin` with the [`cargo install`] command. Among other
6815 things this makes it easier to augment Cargo with new subcommands:
6816 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6817 invoked as `cargo foo`.
6818 * Crates with wildcard (`*`) dependencies will [emit warnings when
6819 published][1.5w]. In 1.6 it will no longer be possible to publish
6820 crates with wildcard dependencies.
6825 * The rules determining when a particular lifetime must outlive
6826 a particular value (known as '[dropck]') have been [modified
6827 to not rely on parametricity][1.5p].
6828 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6829 and `Arc`][1.5a]. Because these smart pointer types implement
6830 `Deref`, this causes breakage in cases where the interior type
6831 contains methods of the same name.
6832 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6833 that they could drop their content. Soundness fix.
6834 * All method invocations are [properly checked][1.5wf1] for
6835 [well-formedness][1.5wf2]. Soundness fix.
6836 * Traits whose supertraits contain `Self` are [not object
6837 safe][1.5o]. Soundness fix.
6838 * Target specifications support a [`no_default_libraries`][1.5nd]
6839 setting that controls whether `-nodefaultlibs` is passed to the
6840 linker, and in turn the `is_like_windows` setting no longer affects
6841 the `-nodefaultlibs` flag.
6842 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6843 * The `#[inline]` and `#[repr]` attributes [can only appear
6844 in valid locations][1.5at].
6845 * Native libraries linked from the local crate are [passed to
6846 the linker before native libraries from upstream crates][1.5nl].
6847 * Two rarely-used attributes, `#[no_debug]` and
6848 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6849 * Negation of unsigned integers, which has been a warning for
6850 several releases, [is now behind a feature gate and will
6851 generate errors][1.5nu].
6852 * The parser accidentally accepted visibility modifiers on
6853 enum variants, a bug [which has been fixed][1.5ev].
6854 * [A bug was fixed that allowed `use` statements to import unstable
6860 * When evaluating expressions at compile-time that are not
6861 compile-time constants (const-evaluating expressions in non-const
6862 contexts), incorrect code such as overlong bitshifts and arithmetic
6863 overflow will [generate a warning instead of an error][1.5ce],
6864 delaying the error until runtime. This will allow the
6865 const-evaluator to be expanded in the future backwards-compatibly.
6866 * The `improper_ctypes` lint [no longer warns about using `isize` and
6867 `usize` in FFI][1.5ict].
6872 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6874 * `Default` is [implemented for mutable slices][1.5d].
6875 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6876 * There are now `From` conversions [between floating point
6877 types][1.5f] where the conversions are lossless.
6878 * There are now `From` conversions [between integer types][1.5i] where
6879 the conversions are lossless.
6880 * [`fs::Metadata` implements `Clone`][1.5fs].
6881 * The `parse` method [accepts a leading "+" when parsing
6883 * [`AsMut` is implemented for `Vec`][1.5am].
6884 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6885 been optimized][1.5cf] and no longer rely on the default impl.
6886 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6887 `unsafe extern "C"` function types now [implement `Clone`,
6888 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6889 `fmt::Debug` for up to 12 arguments][1.5fp].
6890 * [Dropping `Vec`s is much faster in unoptimized builds when the
6891 element types don't implement `Drop`][1.5dv].
6892 * A bug that caused in incorrect behavior when [combining `VecDeque`
6893 with zero-sized types][1.5vdz] was resolved.
6894 * [`PartialOrd` for slices is faster][1.5po].
6899 * [Crate metadata size was reduced by 20%][1.5md].
6900 * [Improvements to code generation reduced the size of libcore by 3.3
6901 MB and rustc's memory usage by 18MB][1.5m].
6902 * [Improvements to deref translation increased performance in
6903 unoptimized builds][1.5dr].
6904 * Various errors in trait resolution [are deduplicated to only be
6905 reported once][1.5te].
6906 * Rust has preliminary [support for rumprun kernels][1.5rr].
6907 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6909 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6910 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6911 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6912 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6913 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6914 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6915 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6916 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6917 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6918 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6919 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6920 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6921 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6922 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6923 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6924 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6925 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6926 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6927 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6928 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6929 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6930 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6931 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6932 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6933 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6934 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6935 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6936 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6937 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6938 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6939 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6940 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6941 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6942 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6943 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6944 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6945 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6946 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6947 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6948 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6949 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6950 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6951 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6952 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6953 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6954 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6955 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6956 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6957 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6958 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6959 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6960 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6961 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6962 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6963 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6964 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6965 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6966 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6967 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6968 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6969 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6970 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6971 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6972 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6973 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6974 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6975 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6976 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6977 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6978 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6979 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6980 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6981 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6982 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6983 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6984 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6985 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6986 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6987 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6988 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6989 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6990 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6991 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6992 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6993 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6994 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6995 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6996 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6997 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6999 Version 1.4.0 (2015-10-29)
7000 ==========================
7002 * ~1200 changes, numerous bugfixes
7007 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7008 GNU) are now supported and recommended for use.
7013 * [Several changes have been made to fix type soundness and improve
7014 the behavior of associated types][sound]. See [RFC 1214]. Although
7015 we have mostly introduced these changes as warnings this release, to
7016 become errors next release, there are still some scenarios that will
7017 see immediate breakage.
7018 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7019 line breaks in addition to `\n`][crlf].
7020 * [Loans of `'static` lifetime extend to the end of a function][stat].
7021 * [`str::parse` no longer introduces avoidable rounding error when
7022 parsing floating point numbers. Together with earlier changes to
7023 float formatting/output, "round trips" like f.to_string().parse()
7024 now preserve the value of f exactly. Additionally, leading plus
7025 signs are now accepted][fp3].
7031 * `use` statements that import multiple items [can now rename
7032 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7033 * [Binops work correctly on fat pointers][binfat].
7034 * `pub extern crate`, which does not behave as expected, [issues a
7035 warning][pec] until a better solution is found.
7040 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7041 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7042 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7043 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7044 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7045 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7046 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7047 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7048 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7049 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7050 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7051 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7052 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7053 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7054 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7055 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7056 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7057 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7059 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7060 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7061 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7062 `f64::from_str_radix`.
7063 * [Reverse-searching strings is faster with the 'two-way'
7065 * [`std::io::copy` allows `?Sized` arguments][cc].
7066 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7067 [override `count`, `nth` and `last` with an O(1)
7068 implementation][it].
7069 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7070 * [`IntoRawFd` has been added to the Unix-specific prelude,
7071 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7073 * [`Extend<String>` and `FromIterator<String` are both implemented for
7075 * [`IntoIterator` is implemented for references to `Option` and
7077 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7078 Copy`][ext] as part of [RFC 839]. This will cause type inference
7079 breakage in rare situations.
7080 * [`BinaryHeap` implements `Debug`][bh2].
7081 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7083 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7084 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7085 * [String comparison is faster][faststr].
7086 * `&mut T` where `T: std::fmt::Write` [also implements
7087 `std::fmt::Write`][mutw].
7088 * [A stable regression in `VecDeque::push_back` and other
7089 capacity-altering methods that caused panics for zero-sized types
7091 * [Function pointers implement traits for up to 12 parameters][fp2].
7096 * The compiler [no longer uses the 'morestack' feature to prevent
7097 stack overflow][mm]. Instead it uses guard pages and stack
7098 probes (though stack probes are not yet implemented on any platform
7100 * [The compiler matches traits faster when projections are involved][p].
7101 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7103 * [Cargo now displays useful information about what its doing during
7104 `cargo update`][cu].
7106 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7107 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7108 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7109 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7110 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7111 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7112 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7113 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7114 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7115 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7116 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7117 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7118 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7119 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7120 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7121 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7122 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7123 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7124 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7125 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7126 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7127 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7128 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7129 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7130 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7131 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7132 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7133 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7134 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7135 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7136 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7137 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7138 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7139 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7140 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7141 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7142 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7143 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7144 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7145 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7146 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7147 [bh2]: https://github.com/rust-lang/rust/pull/28156
7148 [binfat]: https://github.com/rust-lang/rust/pull/28270
7149 [bm]: https://github.com/rust-lang/rust/pull/28197
7150 [cc]: https://github.com/rust-lang/rust/pull/27531
7151 [crlf]: https://github.com/rust-lang/rust/pull/28034
7152 [cu]: https://github.com/rust-lang/cargo/pull/1931
7153 [d]: https://github.com/rust-lang/rust/pull/27825
7154 [dep]: https://github.com/rust-lang/rust/pull/28339
7155 [es]: https://github.com/rust-lang/rust/pull/27956
7156 [ext]: https://github.com/rust-lang/rust/pull/28094
7157 [faststr]: https://github.com/rust-lang/rust/pull/28338
7158 [ffi]: https://github.com/rust-lang/rust/pull/28779
7159 [fp]: https://github.com/rust-lang/rust/pull/28268
7160 [fp2]: https://github.com/rust-lang/rust/pull/28560
7161 [fp3]: https://github.com/rust-lang/rust/pull/27307
7162 [i]: https://github.com/rust-lang/rust/pull/27451
7163 [into2]: https://github.com/rust-lang/rust/pull/28039
7164 [it]: https://github.com/rust-lang/rust/pull/27652
7165 [mm]: https://github.com/rust-lang/rust/pull/27338
7166 [mutw]: https://github.com/rust-lang/rust/pull/28368
7167 [sound]: https://github.com/rust-lang/rust/pull/27641
7168 [p]: https://github.com/rust-lang/rust/pull/27866
7169 [pec]: https://github.com/rust-lang/rust/pull/28486
7170 [pr]: https://github.com/rust-lang/rust/pull/27896
7171 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7172 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7173 [s]: https://github.com/rust-lang/rust/pull/27474
7174 [stab]: https://github.com/rust-lang/rust/pull/28339
7175 [stat]: https://github.com/rust-lang/rust/pull/28321
7176 [vd]: https://github.com/rust-lang/rust/pull/28494
7178 Version 1.3.0 (2015-09-17)
7179 ==============================
7181 * ~900 changes, numerous bugfixes
7186 * The [new object lifetime defaults][nold] have been [turned
7187 on][nold2] after a cycle of warnings about the change. Now types
7188 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7189 being interpreted as `&'a Box<Trait+'a>` to `&'a
7190 Box<Trait+'static>`.
7191 * [The Rustonomicon][nom] is a new book in the official documentation
7192 that dives into writing unsafe Rust.
7193 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7194 timekeeping is employed by other std APIs, as well as out-of-tree
7200 * The [new object lifetime defaults][nold] have been [turned
7201 on][nold2] after a cycle of warnings about the change.
7202 * There is a known [regression][lr] in how object lifetime elision is
7203 interpreted, the proper solution for which is undetermined.
7204 * The `#[prelude_import]` attribute, an internal implementation
7205 detail, was accidentally stabilized previously. [It has been put
7206 behind the `prelude_import` feature gate][pi]. This change is
7207 believed to break no existing code.
7208 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7209 [more sane for dynamically sized types][dst3]. Code that relied on
7210 the previous behavior is thought to be broken.
7211 * The `dropck` rules, which checks that destructors can't access
7212 destroyed values, [have been updated][dropck] to match the
7213 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7214 cause some previously-compiling code to no longer build.
7219 * The [new object lifetime defaults][nold] have been [turned
7220 on][nold2] after a cycle of warnings about the change.
7221 * Semicolons may [now follow types and paths in
7222 macros](https://github.com/rust-lang/rust/pull/27000).
7223 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7224 [more sane for dynamically sized types][dst3]. Code that relied on
7225 the previous behavior is not known to exist, and suspected to be
7227 * `'static` variables [may now be recursive][st].
7228 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7229 implementations correctly.
7230 * The `dropck` rules, which checks that destructors can't access
7231 destroyed values, [have been updated][dropck] to match the
7237 * The [`Duration`] API, [has been stabilized][ds], as well as the
7238 `std::time` module, which presently contains only `Duration`.
7239 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7240 * The owned C string, [`CString`], implements [`Borrow`] and the
7241 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7242 these allow C strings to be borrowed and cloned in generic code.
7243 * [`CStr`] implements [`Debug`].
7244 * [`AtomicPtr`] implements [`Debug`].
7245 * [`Error`] trait objects [can be downcast to their concrete types][e]
7246 in many common configurations, using the [`is`], [`downcast`],
7247 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7249 * Searching for substrings now [employs the two-way algorithm][search]
7250 instead of doing a naive search. This gives major speedups to a
7251 number of methods, including [`contains`][sc], [`find`][sf],
7252 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7253 [`ends_with`][sew] are also faster.
7254 * The performance of `PartialEq` for slices is [much faster][ps].
7255 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7256 is overridden and optimized by the implementations for scalars.
7257 * The [`Hasher`] trait now has a number of specialized `write_*`
7258 methods for primitive types, for efficiency.
7259 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7260 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7261 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7262 of [`std::error::Error::cause`][iec] also delegates to the inner
7264 * [`process::Child`][pc] gained the [`id`] method, which returns a
7265 `u32` representing the platform-specific process identifier.
7266 * The [`connect`] method on slices is deprecated, replaced by the new
7267 [`join`] method (note that both of these are on the *unstable*
7268 [`SliceConcatExt`] trait, but through the magic of the prelude are
7269 available to stable code anyway).
7270 * The [`Div`] operator is implemented for [`Wrapping`] types.
7271 * [`DerefMut` is implemented for `String`][dms].
7272 * Performance of SipHash (the default hasher for `HashMap`) is
7273 [better for long data][sh].
7274 * [`AtomicPtr`] implements [`Send`].
7275 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7276 are now [specialized to use uninitialized buffers for increased
7278 * Lifetime parameters of foreign functions [are now resolved
7284 * Rust can now, with some coercion, [produce programs that run on
7285 Windows XP][xp], though XP is not considered a supported platform.
7286 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7287 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7288 recommended for use in 1.3, though should be fully-functional
7289 in the [64-bit 1.4 beta][b14].
7290 * On Fedora-based systems installation will [properly configure the
7291 dynamic linker][fl].
7292 * The compiler gained many new extended error descriptions, which can
7293 be accessed with the `--explain` flag.
7294 * The `dropck` pass, which checks that destructors can't access
7295 destroyed values, [has been rewritten][dropck]. This fixes some
7296 soundness holes, and as such will cause some previously-compiling
7297 code to no longer build.
7298 * `rustc` now uses [LLVM to write archive files where possible][ar].
7299 Eventually this will eliminate the compiler's dependency on the ar
7301 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7302 supported FreeBSD on x86_64).
7303 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7304 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7306 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7307 will kill the process instead of leaking][nlp].
7309 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7310 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7311 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7312 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7313 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7314 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7315 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7316 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7317 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7318 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7319 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7320 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7321 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7322 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7323 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7324 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7325 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7326 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7327 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7328 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7329 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7330 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7331 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7332 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7333 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7334 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7335 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7336 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7337 [ar]: https://github.com/rust-lang/rust/pull/26926
7338 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7339 [dms]: https://github.com/rust-lang/rust/pull/26241
7340 [dropck]: https://github.com/rust-lang/rust/pull/27261
7341 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7342 [ds]: https://github.com/rust-lang/rust/pull/26818
7343 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7344 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7345 [dst3]: https://github.com/rust-lang/rust/pull/27351
7346 [e]: https://github.com/rust-lang/rust/pull/24793
7347 [f]: https://github.com/rust-lang/rust/pull/26588
7348 [fb]: https://github.com/rust-lang/rust/pull/26959
7349 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7350 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7351 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7352 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7353 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7354 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7355 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7356 [lic]: https://github.com/rust-lang/rust/pull/26583
7357 [lnu]: https://github.com/rust-lang/rust/pull/27026
7358 [lr]: https://github.com/rust-lang/rust/issues/27248
7359 [lum]: https://github.com/rust-lang/rust/pull/26378
7360 [lur]: https://github.com/rust-lang/rust/pull/26783
7361 [nlp]: https://github.com/rust-lang/rust/pull/27176
7362 [nold2]: https://github.com/rust-lang/rust/pull/27045
7363 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7364 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7365 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7366 [pi]: https://github.com/rust-lang/rust/pull/26699
7367 [ps]: https://github.com/rust-lang/rust/pull/26884
7368 [rte]: https://github.com/rust-lang/rust/pull/26950
7369 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7370 [search]: https://github.com/rust-lang/rust/pull/26327
7371 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7372 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7373 [sh]: https://github.com/rust-lang/rust/pull/27280
7374 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7375 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7376 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7377 [st]: https://github.com/rust-lang/rust/pull/26630
7378 [win1]: https://github.com/rust-lang/rust/pull/26569
7379 [win2]: https://github.com/rust-lang/rust/pull/26741
7380 [win3]: https://github.com/rust-lang/rust/pull/26741
7381 [win4]: https://github.com/rust-lang/rust/pull/27210
7382 [xp]: https://github.com/rust-lang/rust/pull/26569
7384 Version 1.2.0 (2015-08-07)
7385 ==========================
7387 * ~1200 changes, numerous bugfixes
7392 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7393 like `Rc` to contain types without a fixed size, arrays and trait
7394 objects, finally enabling use of `Rc<[T]>` and completing the
7395 implementation of DST.
7396 * [Parallel codegen][parcodegen] is now working again, which can
7397 substantially speed up large builds in debug mode; It also gets
7398 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7399 jobs). It's not enabled by default, but will be "in the near
7400 future". It can be activated with the `-C codegen-units=N` flag to
7402 * This is the first release with [experimental support for linking
7403 with the MSVC linker and lib C on Windows (instead of using the GNU
7404 variants via MinGW)][win]. It is yet recommended only for the most
7405 intrepid Rustaceans.
7406 * Benchmark compilations are showing a 30% improvement in
7407 bootstrapping over 1.1.
7412 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7413 unicode case mapping, which is a previously-planned change in
7414 behavior and considered a bugfix.
7415 * [`mem::align_of`] now specifies [the *minimum alignment* for
7416 T][align], which is usually the alignment programs are interested
7417 in, and the same value reported by clang's
7418 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7420 * [The `#[packed]` attribute is no longer silently accepted by the
7421 compiler][packed]. This attribute did nothing and code that
7422 mentioned it likely did not work as intended.
7423 * Associated type defaults are [now behind the
7424 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7425 defaults *did not work*, but could be mentioned syntactically. As
7426 such this breakage has minimal impact.
7431 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7432 matching against dereferenceable values.
7437 * The [`Extend`] trait, which grows a collection from an iterator, is
7438 implemented over iterators of references, for `String`, `Vec`,
7439 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7440 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7441 * The [`iter::once`] function returns an iterator that yields a single
7442 element, and [`iter::empty`] returns an iterator that yields no
7444 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7445 over substring matches.
7446 * [`Cell`] and [`RefCell`] both implement `Eq`.
7447 * A number of methods for wrapping arithmetic are added to the
7448 integral types, [`wrapping_div`], [`wrapping_rem`],
7449 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7450 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7451 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7452 type.. It is illegal for the default arithmetic operations in Rust
7453 to overflow; the desire to wrap must be explicit.
7454 * The `{:#?}` formatting specifier [displays the alternate,
7455 pretty-printed][debugfmt] form of the `Debug` formatter. This
7456 feature was actually introduced prior to 1.0 with little
7458 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7459 for writing data to formatted strings, similar to [`io::Write`].
7460 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7461 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7462 are used by code generators to emit implementations of [`Debug`].
7463 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7464 methods that convert case, following Unicode case mapping.
7465 * It is now easier to handle poisoned locks. The [`PoisonError`]
7466 type, returned by failing lock operations, exposes `into_inner`,
7467 `get_ref`, and `get_mut`, which all give access to the inner lock
7468 guard, and allow the poisoned lock to continue to operate. The
7469 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7470 poisoned lock without attempting to take the lock.
7471 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7472 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7473 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7474 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7476 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7482 * `rustc` employs smarter heuristics for guessing at [typos].
7483 * `rustc` emits more efficient code for [no-op conversions between
7484 unsafe pointers][nop].
7485 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7486 resulting in faster compile times and smaller code.
7488 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7489 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7490 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7491 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7492 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7493 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7494 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7495 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7496 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7497 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7498 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7499 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7500 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7501 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7502 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7503 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7504 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7505 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7506 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7507 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7508 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7509 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7510 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7511 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7512 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7513 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7514 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7515 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7516 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7517 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7518 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7519 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7520 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7521 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7522 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7523 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7524 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7525 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7526 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7527 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7528 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7529 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7530 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7531 [align]: https://github.com/rust-lang/rust/pull/25646
7532 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7533 [typos]: https://github.com/rust-lang/rust/pull/26087
7534 [nop]: https://github.com/rust-lang/rust/pull/26336
7535 [fat]: https://github.com/rust-lang/rust/pull/26411
7536 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7537 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7538 [packed]: https://github.com/rust-lang/rust/pull/25541
7539 [ad]: https://github.com/rust-lang/rust/pull/27382
7540 [win]: https://github.com/rust-lang/rust/pull/25350
7542 Version 1.1.0 (2015-06-25)
7543 =========================
7545 * ~850 changes, numerous bugfixes
7550 * The [`std::fs` module has been expanded][fs] to expand the set of
7551 functionality exposed:
7552 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7553 don't incur a syscall on some platforms.
7554 * A `symlink_metadata` function has been added.
7555 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7556 access to all underlying information.
7557 * The compiler now contains extended explanations of many errors. When an error
7558 with an explanation occurs the compiler suggests using the `--explain` flag
7559 to read the explanation. Error explanations are also [available online][err-index].
7560 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7561 well as other work, the time to bootstrap the compiler decreased by
7567 * The [`str::split_whitespace`] method splits a string on unicode
7568 whitespace boundaries.
7569 * On both Windows and Unix, new extension traits provide conversion of
7570 I/O types to and from the underlying system handles. On Unix, these
7571 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7572 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7573 `TcpListener`, and `UpdSocket`. Further implementations for
7574 `std::process` will be stabilized later.
7575 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7576 Windows, symlinks can be created with
7577 `std::os::windows::symlink_dir` and
7578 `std::os::windows::symlink_file`.
7579 * The `mpsc::Receiver` type can now be converted into an iterator with
7580 `into_iter` on the [`IntoIterator`] trait.
7581 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7582 implementation of the [`From`] trait.
7583 * The `Debug` implementation for `RangeFull` [creates output that is
7584 more consistent with other implementations][rf].
7585 * [`Debug` is implemented for `File`][file].
7586 * The `Default` implementation for `Arc` [no longer requires `Sync +
7588 * [The `Iterator` methods `count`, `nth`, and `last` have been
7589 overridden for slices to have O(1) performance instead of O(n)][si].
7590 * Incorrect handling of paths on Windows has been improved in both the
7591 compiler and the standard library.
7592 * [`AtomicPtr` gained a `Default` implementation][ap].
7593 * In accordance with Rust's policy on arithmetic overflow `abs` now
7594 [panics on overflow when debug assertions are enabled][abs].
7595 * The [`Cloned`] iterator, which was accidentally left unstable for
7596 1.0 [has been stabilized][c].
7597 * The [`Incoming`] iterator, which iterates over incoming TCP
7598 connections, and which was accidentally unnamable in 1.0, [is now
7599 properly exported][inc].
7600 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7601 `sift_up` or `sift_down` panic][bh].
7602 * The [`split_off`] method of `LinkedList` [no longer corrupts
7603 the list in certain scenarios][ll].
7608 * Type checking performance [has improved notably][sk] with
7609 [multiple improvements][pre].
7610 * The compiler [suggests code changes][ch] for more errors.
7611 * rustc and it's build system have experimental support for [building
7612 toolchains against MUSL][m] instead of glibc on Linux.
7613 * The compiler defines the `target_env` cfg value, which is used for
7614 distinguishing toolchains that are otherwise for the same
7615 platform. Presently this is set to `gnu` for common GNU Linux
7616 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7617 * The [`cargo rustc`][crc] command invokes a build with custom flags
7619 * [Android executables are always position independent][pie].
7620 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7623 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7624 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7625 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7626 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7627 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7628 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7629 [rf]: https://github.com/rust-lang/rust/pull/24491
7630 [err-index]: https://doc.rust-lang.org/error-index.html
7631 [sk]: https://github.com/rust-lang/rust/pull/24615
7632 [pre]: https://github.com/rust-lang/rust/pull/25323
7633 [file]: https://github.com/rust-lang/rust/pull/24598
7634 [ch]: https://github.com/rust-lang/rust/pull/24683
7635 [arc]: https://github.com/rust-lang/rust/pull/24695
7636 [si]: https://github.com/rust-lang/rust/pull/24701
7637 [ap]: https://github.com/rust-lang/rust/pull/24834
7638 [m]: https://github.com/rust-lang/rust/pull/24777
7639 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7640 [crc]: https://github.com/rust-lang/cargo/pull/1568
7641 [pie]: https://github.com/rust-lang/rust/pull/24953
7642 [abs]: https://github.com/rust-lang/rust/pull/25441
7643 [c]: https://github.com/rust-lang/rust/pull/25496
7644 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7645 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7646 [inc]: https://github.com/rust-lang/rust/pull/25522
7647 [bh]: https://github.com/rust-lang/rust/pull/25856
7648 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7649 [ll]: https://github.com/rust-lang/rust/pull/26022
7650 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7651 [drop]: https://github.com/rust-lang/rust/pull/24935
7653 Version 1.0.0 (2015-05-15)
7654 ========================
7656 * ~1500 changes, numerous bugfixes
7661 * The vast majority of the standard library is now `#[stable]`. It is
7662 no longer possible to use unstable features with a stable build of
7664 * Many popular crates on [crates.io] now work on the stable release
7666 * Arithmetic on basic integer types now [checks for overflow in debug
7672 * Several [restrictions have been added to trait coherence][coh] in
7673 order to make it easier for upstream authors to change traits
7674 without breaking downstream code.
7675 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7676 improve error messages and macro behavior. For example, `0b1234` is
7677 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7678 * Trait bounds [are always invariant][inv], eliminating the need for
7679 the `PhantomFn` and `MarkerTrait` lang items, which have been
7681 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7682 "foo" as bar` syntax has been replaced with `extern crate foo as
7683 bar`, and Cargo now automatically translates "-" in *package* names
7684 to underscore for the crate name.
7685 * [Lifetime shadowing is an error][lt].
7686 * [`Send` no longer implies `'static`][send-rfc].
7687 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7688 `MyType::default()`.
7689 * Primitive types [now have inherent methods][prim-inherent],
7690 obviating the need for extension traits like `SliceExt`.
7691 * Methods with `Self: Sized` in their `where` clause are [considered
7692 object-safe][self-sized], allowing many extension traits like
7693 `IteratorExt` to be merged into the traits they extended.
7694 * You can now [refer to associated types][assoc-where] whose
7695 corresponding trait bounds appear only in a `where` clause.
7696 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7697 like `Send` and `Sync` are now library-defined.
7698 * A [Reflect trait][reflect] was introduced, which means that
7699 downcasting via the `Any` trait is effectively limited to concrete
7700 types. This helps retain the potentially-important "parametricity"
7701 property: generic code cannot behave differently for different type
7702 arguments except in minor ways.
7703 * The `unsafe_destructor` feature is now deprecated in favor of the
7704 [new `dropck`][dropck]. This change is a major reduction in unsafe
7710 * The `thread_local` module [has been renamed to `std::thread`][th].
7711 * The methods of `IteratorExt` [have been moved to the `Iterator`
7713 * Several traits that implement Rust's conventions for type
7714 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7715 [centralized in the `std::convert` module][con].
7716 * The `FromError` trait [was removed in favor of `From`][fe].
7717 * The basic sleep function [has moved to
7718 `std::thread::sleep_ms`][slp].
7719 * The `splitn` function now takes an `n` parameter that represents the
7720 number of items yielded by the returned iterator [instead of the
7721 number of 'splits'][spl].
7722 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7723 * [Derived implementations of `PartialOrd` now order enums according
7724 to their explicitly-assigned discriminants][po].
7725 * [Methods for searching strings are generic over `Pattern`s][pat],
7726 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7728 * [In method resolution, object methods are resolved before inherent
7730 * [`String::from_str` has been deprecated in favor of the `From` impl,
7731 `String::from`][sf].
7732 * [`io::Error` implements `Sync`][ios].
7733 * [The `words` method on `&str` has been replaced with
7734 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7736 * The new path and IO modules are complete and `#[stable]`. This
7737 was the major library focus for this cycle.
7738 * The path API was [revised][path-normalize] to normalize `.`,
7739 adjusting the tradeoffs in favor of the most common usage.
7740 * A large number of remaining APIs in `std` were also stabilized
7741 during this cycle; about 75% of the non-deprecated API surface
7743 * The new [string pattern API][string-pattern] landed, which makes
7744 the string slice API much more internally consistent and flexible.
7745 * A new set of [generic conversion traits][conversion] replaced
7746 many existing ad hoc traits.
7747 * Generic numeric traits were [completely removed][num-traits]. This
7748 was made possible thanks to inherent methods for primitive types,
7749 and the removal gives maximal flexibility for designing a numeric
7750 hierarchy in the future.
7751 * The `Fn` traits are now related via [inheritance][fn-inherit]
7752 and provide ergonomic [blanket implementations][fn-blanket].
7753 * The `Index` and `IndexMut` traits were changed to
7754 [take the index by value][index-value], enabling code like
7755 `hash_map["string"]` to work.
7756 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7757 `Copy` data is known to be `Clone` as well.
7762 * Many errors now have extended explanations that can be accessed with
7763 the `--explain` flag to `rustc`.
7764 * Many new examples have been added to the standard library
7766 * rustdoc has received a number of improvements focused on completion
7768 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7769 * Much headway was made on ecosystem-wide CI, making it possible
7770 to [compare builds for breakage][ci-compare].
7773 [crates.io]: http://crates.io
7774 [clo]: https://github.com/rust-lang/rust/pull/24034
7775 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7776 [con]: https://github.com/rust-lang/rust/pull/23875
7777 [cr]: https://github.com/rust-lang/rust/pull/23419
7778 [fe]: https://github.com/rust-lang/rust/pull/23879
7779 [ie]: https://github.com/rust-lang/rust/pull/23300
7780 [inv]: https://github.com/rust-lang/rust/pull/23938
7781 [ios]: https://github.com/rust-lang/rust/pull/24133
7782 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7783 [lt]: https://github.com/rust-lang/rust/pull/24057
7784 [meth]: https://github.com/rust-lang/rust/pull/24056
7785 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7786 [po]: https://github.com/rust-lang/rust/pull/24270
7787 [sf]: https://github.com/rust-lang/rust/pull/24517
7788 [slp]: https://github.com/rust-lang/rust/pull/23949
7789 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7790 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7791 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7792 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7793 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7794 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7795 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7796 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7797 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7798 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7799 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7800 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7801 [reflect]: https://github.com/rust-lang/rust/pull/23712
7802 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7803 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7804 [index-value]: https://github.com/rust-lang/rust/pull/23601
7805 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7806 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7807 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7808 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7809 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7810 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7813 Version 1.0.0-alpha.2 (2015-02-20)
7814 =====================================
7816 * ~1300 changes, numerous bugfixes
7820 * The various I/O modules were [overhauled][io-rfc] to reduce
7821 unnecessary abstractions and provide better interoperation with
7822 the underlying platform. The old `io` module remains temporarily
7824 * The standard library now [participates in feature gating][feat],
7825 so use of unstable libraries now requires a `#![feature(...)]`
7826 attribute. The impact of this change is [described on the
7827 forum][feat-forum]. [RFC][feat-rfc].
7831 * `for` loops [now operate on the `IntoIterator` trait][into],
7832 which eliminates the need to call `.iter()`, etc. to iterate
7833 over collections. There are some new subtleties to remember
7834 though regarding what sort of iterators various types yield, in
7835 particular that `for foo in bar { }` yields values from a move
7836 iterator, destroying the original collection. [RFC][into-rfc].
7837 * Objects now have [default lifetime bounds][obj], so you don't
7838 have to write `Box<Trait+'static>` when you don't care about
7839 storing references. [RFC][obj-rfc].
7840 * In types that implement `Drop`, [lifetimes must outlive the
7841 value][drop]. This will soon make it possible to safely
7842 implement `Drop` for types where `#[unsafe_destructor]` is now
7843 required. Read the [gorgeous RFC][drop-rfc] for details.
7844 * The fully qualified <T as Trait>::X syntax lets you set the Self
7845 type for a trait method or associated type. [RFC][ufcs-rfc].
7846 * References to types that implement `Deref<U>` now [automatically
7847 coerce to references][deref] to the dereferenced type `U`,
7848 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7849 should eliminate many unsightly uses of `&*`, as when converting
7850 from references to vectors into references to
7851 slices. [RFC][deref-rfc].
7852 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7853 `|:|`) is obsolete and closure kind is inferred from context.
7854 * [`Self` is a keyword][Self].
7858 * The `Show` and `String` formatting traits [have been
7859 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7860 their related purposes. Automatically getting a string
7861 conversion to use with `format!("{:?}", something_to_debug)` is
7862 now written `#[derive(Debug)]`.
7863 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7864 OsStr}`, provide strings in platform-specific encodings for easier
7865 interop with system APIs. [RFC][osstr-rfc].
7866 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7867 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7868 creating raw pointers.
7872 * Certain long error messages of the form 'expected foo found bar'
7873 are now [split neatly across multiple
7874 lines][multiline]. Examples in the PR.
7875 * On Unix Rust can be [uninstalled][un] by running
7876 `/usr/local/lib/rustlib/uninstall.sh`.
7877 * The `#[rustc_on_unimplemented]` attribute, requiring the
7878 'on_unimplemented' feature, lets rustc [display custom error
7879 messages when a trait is expected to be implemented for a type
7884 * Rust is tested against a [LALR grammar][lalr], which parses
7885 almost all the Rust files that rustc does.
7887 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7888 [close]: https://github.com/rust-lang/rust/pull/21843
7889 [deref]: https://github.com/rust-lang/rust/pull/21351
7890 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7891 [drop]: https://github.com/rust-lang/rust/pull/21972
7892 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7893 [feat]: https://github.com/rust-lang/rust/pull/21248
7894 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7895 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7896 [fmt]: https://github.com/rust-lang/rust/pull/21457
7897 [into]: https://github.com/rust-lang/rust/pull/20790
7898 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7899 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7900 [lalr]: https://github.com/rust-lang/rust/pull/21452
7901 [multiline]: https://github.com/rust-lang/rust/pull/19870
7902 [obj]: https://github.com/rust-lang/rust/pull/22230
7903 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7904 [onun]: https://github.com/rust-lang/rust/pull/20889
7905 [osstr]: https://github.com/rust-lang/rust/pull/21488
7906 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7907 [Self]: https://github.com/rust-lang/rust/pull/22158
7908 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7909 [un]: https://github.com/rust-lang/rust/pull/22256
7912 Version 1.0.0-alpha (2015-01-09)
7913 ==================================
7915 * ~2400 changes, numerous bugfixes
7919 * The language itself is considered feature complete for 1.0,
7920 though there will be many usability improvements and bugfixes
7921 before the final release.
7922 * Nearly 50% of the public API surface of the standard library has
7923 been declared 'stable'. Those interfaces are unlikely to change
7925 * The long-running debate over integer types has been
7926 [settled][ints]: Rust will ship with types named `isize` and
7927 `usize`, rather than `int` and `uint`, for pointer-sized
7928 integers. Guidelines will be rolled out during the alpha cycle.
7929 * Most crates that are not `std` have been moved out of the Rust
7930 distribution into the Cargo ecosystem so they can evolve
7931 separately and don't need to be stabilized as quickly, including
7932 'time', 'getopts', 'num', 'regex', and 'term'.
7933 * Documentation continues to be expanded with more API coverage, more
7934 examples, and more in-depth explanations. The guides have been
7935 consolidated into [The Rust Programming Language][trpl].
7936 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7937 * All official Rust binary installers now come with [Cargo], the
7938 Rust package manager.
7942 * Closures have been [completely redesigned][unboxed] to be
7943 implemented in terms of traits, can now be used as generic type
7944 bounds and thus monomorphized and inlined, or via an opaque
7945 pointer (boxed) as in the old system. The new system is often
7946 referred to as 'unboxed' closures.
7947 * Traits now support [associated types][assoc], allowing families
7948 of related types to be defined together and used generically in
7950 * Enum variants are [namespaced by their type names][enum].
7951 * [`where` clauses][where] provide a more versatile and attractive
7952 syntax for specifying generic bounds, though the previous syntax
7954 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7956 * Rust [no longer has a runtime][rt] of any description, and only
7957 supports OS threads, not green threads.
7958 * At long last, Rust has been overhauled for 'dynamically-sized
7959 types' ([DST]), which integrates 'fat pointers' (object types,
7960 arrays, and `str`) more deeply into the type system, making it
7962 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7963 `..j` that produce range types and which, when combined with the
7964 `Index` operator and multidispatch, leads to a convenient slice
7966 * The new range syntax revealed an ambiguity in the fixed-length
7967 array syntax, so now fixed length arrays [are written `[T;
7969 * The `Copy` trait is no longer implemented automatically. Unsafe
7970 pointers no longer implement `Sync` and `Send` so types
7971 containing them don't automatically either. `Sync` and `Send`
7972 are now 'unsafe traits' so one can "forcibly" implement them via
7973 `unsafe impl` if a type confirms to the requirements for them
7974 even though the internals do not (e.g. structs containing unsafe
7975 pointers like `Arc`). These changes are intended to prevent some
7976 footguns and are collectively known as [opt-in built-in
7977 traits][oibit] (though `Sync` and `Send` will soon become pure
7978 library types unknown to the compiler).
7979 * Operator traits now take their operands [by value][ops], and
7980 comparison traits can use multidispatch to compare one type
7981 against multiple other types, allowing e.g. `String` to be
7982 compared with `&str`.
7983 * `if let` and `while let` are no longer feature-gated.
7984 * Rust has adopted a more [uniform syntax for escaping unicode
7985 characters][unicode].
7986 * `macro_rules!` [has been declared stable][mac]. Though it is a
7987 flawed system it is sufficiently popular that it must be usable
7988 for 1.0. Effort has gone into [future-proofing][mac-future] it
7989 in ways that will allow other macro systems to be developed in
7990 parallel, and won't otherwise impact the evolution of the
7992 * The prelude has been [pared back significantly][prelude] such
7993 that it is the minimum necessary to support the most pervasive
7994 code patterns, and through [generalized where clauses][where]
7995 many of the prelude extension traits have been consolidated.
7996 * Rust's rudimentary reflection [has been removed][refl], as it
7997 incurred too much code generation for little benefit.
7998 * [Struct variants][structvars] are no longer feature-gated.
7999 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8000 known as 'higher-ranked trait bounds', this crucially allows
8001 unboxed closures to work.
8002 * Macros invocations surrounded by parens or square brackets and
8003 not terminated by a semicolon are [parsed as
8004 expressions][macros], which makes expressions like `vec![1i32,
8005 2, 3].len()` work as expected.
8006 * Trait objects now implement their traits automatically, and
8007 traits that can be coerced to objects now must be [object
8009 * Automatically deriving traits is now done with `#[derive(...)]`
8010 not `#[deriving(...)]` for [consistency with other naming
8011 conventions][derive].
8012 * Importing the containing module or enum at the same time as
8013 items or variants they contain is [now done with `self` instead
8014 of `mod`][self], as in use `foo::{self, bar}`
8015 * Glob imports are no longer feature-gated.
8016 * The `box` operator and `box` patterns have been feature-gated
8017 pending a redesign. For now unique boxes should be allocated
8018 like other containers, with `Box::new`.
8022 * A [series][coll1] of [efforts][coll2] to establish
8023 [conventions][coll3] for collections types has resulted in API
8024 improvements throughout the standard library.
8025 * New [APIs for error handling][err] provide ergonomic interop
8026 between error types, and [new conventions][err-conv] describe
8027 more clearly the recommended error handling strategies in Rust.
8028 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8029 it is easier to discuss failure in the context of error handling
8030 without making clarifications as to whether you are referring to
8031 the 'fail' macro or failure more generally.
8032 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8033 syscall when available.
8034 * The 'serialize' crate has been renamed 'rustc-serialize' and
8035 moved out of the distribution to Cargo. Although it is widely
8036 used now, it is expected to be superseded in the near future.
8037 * The `Show` formatter, typically implemented with
8038 `#[derive(Show)]` is [now requested with the `{:?}`
8039 specifier][show] and is intended for use by all types, for uses
8040 such as `println!` debugging. The new `String` formatter must be
8041 implemented by hand, uses the `{}` specifier, and is intended
8042 for full-fidelity conversions of things that can logically be
8043 represented as strings.
8047 * [Flexible target specification][flex] allows rustc's code
8048 generation to be configured to support otherwise-unsupported
8050 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8051 respective debuggers with Rust-appropriate pretty-printing.
8052 * The Windows installation of Rust is distributed with the
8053 MinGW components currently required to link binaries on that
8058 * Nullable enum optimizations have been extended to more types so
8059 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8060 space than the inner types themselves.
8061 * Work has begun on supporting AArch64.
8063 [Cargo]: https://crates.io
8064 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8065 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8066 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8067 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8068 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8069 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8070 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8071 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8072 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8073 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8074 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8075 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8076 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8077 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8078 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8079 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8080 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8081 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8082 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8083 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8084 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8085 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8086 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8087 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8088 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8089 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8090 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8091 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8092 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8093 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8094 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8095 [trpl]: https://doc.rust-lang.org/book/index.html
8096 [rbe]: http://rustbyexample.com/
8099 Version 0.12.0 (2014-10-09)
8100 =============================
8102 * ~1900 changes, numerous bugfixes
8106 * The introductory documentation (now called The Rust Guide) has
8107 been completely rewritten, as have a number of supplementary
8109 * Rust's package manager, Cargo, continues to improve and is
8110 sometimes considered to be quite awesome.
8111 * Many API's in `std` have been reviewed and updated for
8112 consistency with the in-development Rust coding
8113 guidelines. The standard library documentation tracks
8114 stabilization progress.
8115 * Minor libraries have been moved out-of-tree to the rust-lang org
8116 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8117 be installed with Cargo.
8118 * Lifetime elision allows lifetime annotations to be left off of
8119 function declarations in many common scenarios.
8120 * Rust now works on 64-bit Windows.
8123 * Indexing can be overloaded with the `Index` and `IndexMut`
8125 * The `if let` construct takes a branch only if the `let` pattern
8126 matches, currently behind the 'if_let' feature gate.
8127 * 'where clauses', a more flexible syntax for specifying trait
8128 bounds that is more aesthetic, have been added for traits and
8129 free functions. Where clauses will in the future make it
8130 possible to constrain associated types, which would be
8131 impossible with the existing syntax.
8132 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8133 the 'slicing_syntax' feature gate, and can be overloaded with
8134 the `Slice` or `SliceMut` traits.
8135 * The syntax for matching of sub-slices has been changed to use a
8136 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8137 consistency with other uses of `..` and to future-proof
8138 potential additional uses of the syntax.
8139 * The syntax for matching inclusive ranges in patterns has changed
8140 from `0..3` to `0...4` to be consistent with the exclusive range
8142 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8143 c]`) has been put behind the 'advanced_slice_patterns' feature
8144 gate and may be removed in the future.
8145 * Components of tuples and tuple structs can be extracted using
8146 the `value.0` syntax, currently behind the `tuple_indexing`
8148 * The `#[crate_id]` attribute is no longer supported; versioning
8149 is handled by the package manager.
8150 * Renaming crate imports are now written `extern crate foo as bar`
8151 instead of `extern crate bar = foo`.
8152 * Renaming use statements are now written `use foo as bar` instead
8154 * `let` and `match` bindings and argument names in macros are now
8156 * The new, more efficient, closure types ('unboxed closures') have
8157 been added under a feature gate, 'unboxed_closures'. These will
8158 soon replace the existing closure types, once higher-ranked
8159 trait lifetimes are added to the language.
8160 * `move` has been added as a keyword, for indicating closures
8161 that capture by value.
8162 * Mutation and assignment is no longer allowed in pattern guards.
8163 * Generic structs and enums can now have trait bounds.
8164 * The `Share` trait is now called `Sync` to free up the term
8165 'shared' to refer to 'shared reference' (the default reference
8167 * Dynamically-sized types have been mostly implemented,
8168 unifying the behavior of fat-pointer types with the rest of the
8170 * As part of dynamically-sized types, the `Sized` trait has been
8171 introduced, which qualifying types implement by default, and
8172 which type parameters expect by default. To specify that a type
8173 parameter does not need to be sized, write `<Sized? T>`. Most
8174 types are `Sized`, notable exceptions being unsized arrays
8175 (`[T]`) and trait types.
8176 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8177 * Lifetime bounds can now be applied to type parameters and object
8179 * The old, reference counted GC type, `Gc<T>` which was once
8180 denoted by the `@` sigil, has finally been removed. GC will be
8181 revisited in the future.
8184 * Library documentation has been improved for a number of modules.
8185 * Bit-vectors, collections::bitv has been modernized.
8186 * The url crate is deprecated in favor of
8187 http://github.com/servo/rust-url, which can be installed with
8189 * Most I/O stream types can be cloned and subsequently closed from
8191 * A `std::time::Duration` type has been added for use in I/O
8192 methods that rely on timers, as well as in the 'time' crate's
8193 `Timespec` arithmetic.
8194 * The runtime I/O abstraction layer that enabled the green thread
8195 scheduler to do non-thread-blocking I/O has been removed, along
8196 with the libuv-based implementation employed by the green thread
8197 scheduler. This will greatly simplify the future I/O work.
8198 * `collections::btree` has been rewritten to have a more
8199 idiomatic and efficient design.
8202 * rustdoc output now indicates the stability levels of API's.
8203 * The `--crate-name` flag can specify the name of the crate
8204 being compiled, like `#[crate_name]`.
8205 * The `-C metadata` specifies additional metadata to hash into
8206 symbol names, and `-C extra-filename` specifies additional
8207 information to put into the output filename, for use by the
8208 package manager for versioning.
8209 * debug info generation has continued to improve and should be
8210 more reliable under both gdb and lldb.
8211 * rustc has experimental support for compiling in parallel
8212 using the `-C codegen-units` flag.
8213 * rustc no longer encodes rpath information into binaries by
8217 * Stack usage has been optimized with LLVM lifetime annotations.
8218 * Official Rust binaries on Linux are more compatible with older
8219 kernels and distributions, built on CentOS 5.10.
8222 Version 0.11.0 (2014-07-02)
8223 ==========================
8225 * ~1700 changes, numerous bugfixes
8228 * ~[T] has been removed from the language. This type is superseded by
8230 * ~str has been removed from the language. This type is superseded by
8232 * ~T has been removed from the language. This type is superseded by the
8234 * @T has been removed from the language. This type is superseded by the
8235 standard library's std::gc::Gc<T> type.
8236 * Struct fields are now all private by default.
8237 * Vector indices and shift amounts are both required to be a `uint`
8238 instead of any integral type.
8239 * Byte character, byte string, and raw byte string literals are now all
8240 supported by prefixing the normal literal with a `b`.
8241 * Multiple ABIs are no longer allowed in an ABI string
8242 * The syntax for lifetimes on closures/procedures has been tweaked
8243 slightly: `<'a>|A, B|: 'b + K -> T`
8244 * Floating point modulus has been removed from the language; however it
8245 is still provided by a library implementation.
8246 * Private enum variants are now disallowed.
8247 * The `priv` keyword has been removed from the language.
8248 * A closure can no longer be invoked through a &-pointer.
8249 * The `use foo, bar, baz;` syntax has been removed from the language.
8250 * The transmute intrinsic no longer works on type parameters.
8251 * Statics now allow blocks/items in their definition.
8252 * Trait bounds are separated from objects with + instead of : now.
8253 * Objects can no longer be read while they are mutably borrowed.
8254 * The address of a static is now marked as insignificant unless the
8255 #[inline(never)] attribute is placed it.
8256 * The #[unsafe_destructor] attribute is now behind a feature gate.
8257 * Struct literals are no longer allowed in ambiguous positions such as
8258 if, while, match, and for..in.
8259 * Declaration of lang items and intrinsics are now feature-gated by
8261 * Integral literals no longer default to `int`, and floating point
8262 literals no longer default to `f64`. Literals must be suffixed with an
8263 appropriate type if inference cannot determine the type of the
8265 * The Box<T> type is no longer implicitly borrowed to &mut T.
8266 * Procedures are now required to not capture borrowed references.
8269 * The standard library is now a "facade" over a number of underlying
8270 libraries. This means that development on the standard library should
8271 be speedier due to smaller crates, as well as a clearer line between
8273 * A new library, libcore, lives under the standard library's facade
8274 which is Rust's "0-assumption" library, suitable for embedded and
8275 kernel development for example.
8276 * A regex crate has been added to the standard distribution. This crate
8277 includes statically compiled regular expressions.
8278 * The unwrap/unwrap_err methods on Result require a Show bound for
8279 better error messages.
8280 * The return types of the std::comm primitives have been centralized
8281 around the Result type.
8282 * A number of I/O primitives have gained the ability to time out their
8284 * A number of I/O primitives have gained the ability to close their
8285 reading/writing halves to cancel pending operations.
8286 * Reverse iterator methods have been removed in favor of `rev()` on
8287 their forward-iteration counterparts.
8288 * A bitflags! macro has been added to enable easy interop with C and
8289 management of bit flags.
8290 * A debug_assert! macro is now provided which is disabled when
8291 `--cfg ndebug` is passed to the compiler.
8292 * A graphviz crate has been added for creating .dot files.
8293 * The std::cast module has been migrated into std::mem.
8294 * The std::local_data api has been migrated from freestanding functions
8295 to being based on methods.
8296 * The Pod trait has been renamed to Copy.
8297 * jemalloc has been added as the default allocator for types.
8298 * The API for allocating memory has been changed to use proper alignment
8299 and sized deallocation
8300 * Connecting a TcpStream or binding a TcpListener is now based on a
8301 string address and a u16 port. This allows connecting to a hostname as
8303 * The Reader trait now contains a core method, read_at_least(), which
8304 correctly handles many repeated 0-length reads.
8305 * The process-spawning API is now centered around a builder-style
8307 * The :? printing qualifier has been moved from the standard library to
8308 an external libdebug crate.
8309 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8310 have been renamed to Eq/Ord.
8311 * The select/plural methods have been removed from format!. The escapes
8312 for { and } have also changed from \{ and \} to {{ and }},
8314 * The TaskBuilder API has been re-worked to be a true builder, and
8315 extension traits for spawning native/green tasks have been added.
8318 * All breaking changes to the language or libraries now have their
8319 commit message annotated with `[breaking-change]` to allow for easy
8320 discovery of breaking changes.
8321 * The compiler will now try to suggest how to annotate lifetimes if a
8322 lifetime-related error occurs.
8323 * Debug info continues to be improved greatly with general bug fixes and
8324 better support for situations like link time optimization (LTO).
8325 * Usage of syntax extensions when cross-compiling has been fixed.
8326 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8327 -fdata-sections and --gc-sections has been enabled by default
8328 * The compiler is now stricter about where it will load module files
8329 from when a module is declared via `mod foo;`.
8330 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8331 Syntax extensions are now discovered via a "plugin registrar" type
8332 which will be extended in the future to other various plugins.
8333 * Lints have been restructured to allow for dynamically loadable lints.
8334 * A number of rustdoc improvements:
8335 * The HTML output has been visually redesigned.
8336 * Markdown is now powered by hoedown instead of sundown.
8337 * Searching heuristics have been greatly improved.
8338 * The search index has been reduced in size by a great amount.
8339 * Cross-crate documentation via `pub use` has been greatly improved.
8340 * Primitive types are now hyperlinked and documented.
8341 * Documentation has been moved from static.rust-lang.org/doc to
8343 * A new sandbox, play.rust-lang.org, is available for running and
8344 sharing rust code examples on-line.
8345 * Unused attributes are now more robustly warned about.
8346 * The dead_code lint now warns about unused struct fields.
8347 * Cross-compiling to iOS is now supported.
8348 * Cross-compiling to mipsel is now supported.
8349 * Stability attributes are now inherited by default and no longer apply
8350 to intra-crate usage, only inter-crate usage.
8351 * Error message related to non-exhaustive match expressions have been
8355 Version 0.10 (2014-04-03)
8356 =========================
8358 * ~1500 changes, numerous bugfixes
8361 * A new RFC process is now in place for modifying the language.
8362 * Patterns with `@`-pointers have been removed from the language.
8363 * Patterns with unique vectors (`~[T]`) have been removed from the
8365 * Patterns with unique strings (`~str`) have been removed from the
8367 * `@str` has been removed from the language.
8368 * `@[T]` has been removed from the language.
8369 * `@self` has been removed from the language.
8370 * `@Trait` has been removed from the language.
8371 * Headers on `~` allocations which contain `@` boxes inside the type for
8372 reference counting have been removed.
8373 * The semantics around the lifetimes of temporary expressions have changed,
8374 see #3511 and #11585 for more information.
8375 * Cross-crate syntax extensions are now possible, but feature gated. See
8376 #11151 for more information. This includes both `macro_rules!` macros as
8377 well as syntax extensions such as `format!`.
8378 * New lint modes have been added, and older ones have been turned on to be
8380 * Unnecessary parentheses
8383 * Uppercase variables
8384 * Publicly visible private types
8385 * `#[deriving]` with raw pointers
8386 * Unsafe functions can no longer be coerced to closures.
8387 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8388 * The `#[simd]` attribute is now behind a feature gate.
8389 * Visibility is no longer allowed on `extern crate` statements, and
8390 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8391 * Trailing commas are now allowed in argument lists and tuple patterns.
8392 * The `do` keyword has been removed, it is now a reserved keyword.
8393 * Default type parameters have been implemented, but are feature gated.
8394 * Borrowed variables through captures in closures are now considered soundly.
8395 * `extern mod` is now `extern crate`
8396 * The `Freeze` trait has been removed.
8397 * The `Share` trait has been added for types that can be shared among
8399 * Labels in macros are now hygienic.
8400 * Expression/statement macro invocations can be delimited with `{}` now.
8401 * Treatment of types allowed in `static mut` locations has been tweaked.
8402 * The `*` and `.` operators are now overloadable through the `Deref` and
8404 * `~Trait` and `proc` no longer have `Send` bounds by default.
8405 * Partial type hints are now supported with the `_` type marker.
8406 * An `Unsafe` type was introduced for interior mutability. It is now
8407 considered undefined to transmute from `&T` to `&mut T` without using the
8409 * The #[linkage] attribute was implemented for extern statics/functions.
8410 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8411 * `Pod` was renamed to `Copy`.
8414 * The `libextra` library has been removed. It has now been decomposed into
8415 component libraries with smaller and more focused nuggets of
8416 functionality. The full list of libraries can be found on the
8417 documentation index page.
8418 * std: `std::condition` has been removed. All I/O errors are now propagated
8419 through the `Result` type. In order to assist with error handling, a
8420 `try!` macro for unwrapping errors with an early return and a lint for
8421 unused results has been added. See #12039 for more information.
8422 * std: The `vec` module has been renamed to `slice`.
8423 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8424 This will become the only growable vector in the future.
8425 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8426 are now found at `std::io::BufferedReader` instead of
8427 `std::io::buffered::BufferedReader`.
8428 * std: `print` and `println` are no longer in the prelude, the `print!` and
8429 `println!` macros are intended to be used instead.
8430 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8431 attempts to statically prevent cycles.
8432 * std: The standard distribution is adopting the policy of pushing failure
8433 to the user rather than failing in libraries. Many functions (such as
8434 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8435 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8436 deriving mode: `#[deriving(Show)]`.
8437 * std: `ToStr` is now implemented for all types implementing `Show`.
8438 * std: The formatting trait methods now take `&self` instead of `&T`
8439 * std: The `invert()` method on iterators has been renamed to `rev()`
8440 * std: `std::num` has seen a reduction in the genericity of its traits,
8441 consolidating functionality into a few core traits.
8442 * std: Backtraces are now printed on task failure if the environment
8443 variable `RUST_BACKTRACE` is present.
8444 * std: Naming conventions for iterators have been standardized. More details
8445 can be found on the wiki's style guide.
8446 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8447 still implement the function.
8448 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8449 * std: `assert_approx_eq!` has been removed
8450 * std: The `e` and `E` formatting specifiers for floats have been added to
8451 print them in exponential notation.
8452 * std: The `Times` trait has been removed
8453 * std: Indications of variance and opting out of builtin bounds is done
8454 through marker types in `std::kinds::marker` now
8455 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8456 `#[deriving(Hash)]` is now possible.
8457 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8458 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8459 * std: `Chan::new` is now `channel()`.
8460 * std: A new synchronous channel type has been implemented.
8461 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8462 * std: `hashmap` and `trie` have been moved to `libcollections`
8463 * std: `run` has been rolled into `io::process`
8464 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8465 * std: The equality and comparison traits have seen some reorganization.
8466 * std: `rand` has moved to `librand`.
8467 * std: `to_{lower,upper}case` has been implemented for `char`.
8468 * std: Logging has been moved to `liblog`.
8469 * collections: `HashMap` has been rewritten for higher performance and less
8471 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8472 it can be booted manually. The runtime guide has more information and
8474 * native: All I/O functionality except signals has been implemented.
8475 * green: Task spawning with `libgreen` has been optimized with stack caching
8476 and various trimming of code.
8477 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8478 * sync: The `extra::sync` module has been updated to modern rust (and moved
8479 to the `sync` library), tweaking and improving various interfaces while
8480 dropping redundant functionality.
8481 * sync: A new `Barrier` type has been added to the `sync` library.
8482 * sync: An efficient mutex for native and green tasks has been implemented.
8483 * serialize: The `base64` module has seen some improvement. It treats
8484 newlines better, has non-string error values, and has seen general
8486 * fourcc: A `fourcc!` macro was introduced
8487 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8488 hexadecimal literal.
8491 * `rustpkg` has been deprecated and removed from the main repository. Its
8492 replacement, `cargo`, is under development.
8493 * Nightly builds of rust are now available
8494 * The memory usage of rustc has been improved many times throughout this
8496 * The build process supports disabling rpath support for the rustc binary
8498 * Code generation has improved in some cases, giving more information to the
8499 LLVM optimization passes to enable more extensive optimizations.
8500 * Debuginfo compatibility with lldb on OSX has been restored.
8501 * The master branch is now gated on an android bot, making building for
8502 android much more reliable.
8503 * Output flags have been centralized into one `--emit` flag.
8504 * Crate type flags have been centralized into one `--crate-type` flag.
8505 * Codegen flags have been consolidated behind a `-C` flag.
8506 * Linking against outdated crates now has improved error messages.
8507 * Error messages with lifetimes will often suggest how to annotate the
8508 function to fix the error.
8509 * Many more types are documented in the standard library, and new guides
8511 * Many `rustdoc` improvements:
8512 * code blocks are syntax highlighted.
8513 * render standalone markdown files.
8514 * the --test flag tests all code blocks by default.
8515 * exported macros are displayed.
8516 * re-exported types have their documentation inlined at the location of the
8518 * search works across crates that have been rendered to the same output
8522 Version 0.9 (2014-01-09)
8523 ==========================
8525 * ~1800 changes, numerous bugfixes
8528 * The `float` type has been removed. Use `f32` or `f64` instead.
8529 * A new facility for enabling experimental features (feature gating) has
8530 been added, using the crate-level `#[feature(foo)]` attribute.
8531 * Managed boxes (@) are now behind a feature gate
8532 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8533 standard library's `Gc` or `Rc` types instead.
8534 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8535 * Jumping back to the top of a loop is now done with `continue` instead of
8537 * Strings can no longer be mutated through index assignment.
8538 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8539 hash delimiters, as in `r###"foo"###`.
8540 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8542 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8543 * `@fn`s have been removed.
8544 * `do` only works with procs in order to make it obvious what the cost
8546 * Single-element tuple-like structs can no longer be dereferenced to
8547 obtain the inner value. A more comprehensive solution for overloading
8548 the dereference operator will be provided in the future.
8549 * The `#[link(...)]` attribute has been replaced with
8550 `#[crate_id = "name#vers"]`.
8551 * Empty `impl`s must be terminated with empty braces and may not be
8552 terminated with a semicolon.
8553 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8554 no longer has any special meaning.
8555 * The old `fmt!` string formatting macro has been removed.
8556 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8557 `print!` and `println!`.
8558 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8559 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8560 `extern mod foo = "bar"` instead.
8561 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8562 * Macros can have attributes.
8563 * Macros can expand to items with attributes.
8564 * Macros can expand to multiple items.
8565 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8566 * Comments may be nested.
8567 * Values automatically coerce to trait objects they implement, without
8569 * Enum discriminants are no longer an entire word but as small as needed to
8570 contain all the variants. The `repr` attribute can be used to override
8571 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8572 `#[repr(C)]` to match C enums.
8573 * Non-string literals are not allowed in attributes (they never worked).
8574 * The FFI now supports variadic functions.
8575 * Octal numeric literals, as in `0o7777`.
8576 * The `concat!` syntax extension performs compile-time string concatenation.
8577 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8578 removed as Rust no longer uses segmented stacks.
8579 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8580 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8581 not `*`; ignoring remaining fields of a struct is also done with `..`,
8582 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8583 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8584 * `rustc` supports the "system" calling convention, which defaults to the
8585 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8587 * The `type_overflow` lint (default: warn) checks literals for overflow.
8588 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8589 * The `attribute_usage` lint (default: warn) warns about unknown
8591 * The `unknown_features` lint (default: warn) warns about unknown
8593 * The `dead_code` lint (default: warn) checks for dead code.
8594 * Rust libraries can be linked statically to one another
8595 * `#[link_args]` is behind the `link_args` feature gate.
8596 * Native libraries are now linked with `#[link(name = "foo")]`
8597 * Native libraries can be statically linked to a rust crate
8598 (`#[link(name = "foo", kind = "static")]`).
8599 * Native OS X frameworks are now officially supported
8600 (`#[link(name = "foo", kind = "framework")]`).
8601 * The `#[thread_local]` attribute creates thread-local (not task-local)
8602 variables. Currently behind the `thread_local` feature gate.
8603 * The `return` keyword may be used in closures.
8604 * Types that can be copied via a memcpy implement the `Pod` kind.
8605 * The `cfg` attribute can now be used on struct fields and enum variants.
8608 * std: The `option` and `result` API's have been overhauled to make them
8609 simpler, more consistent, and more composable.
8610 * std: The entire `std::io` module has been replaced with one that is
8611 more comprehensive and that properly interfaces with the underlying
8612 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8614 * std: `io::util` contains a number of useful implementations of
8615 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8616 `ZeroReader`, `TeeReader`.
8617 * std: The reference counted pointer type `extra::rc` moved into std.
8618 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8619 just a wrapper around it).
8620 * std: The `Either` type has been removed.
8621 * std: `fmt::Default` can be implemented for any type to provide default
8622 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8623 * std: The `rand` API continues to be tweaked.
8624 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8625 on failure in gdb, is now named `rust_fail`.
8626 * std: The `each_key` and `each_value` methods on `HashMap` have been
8627 replaced by the `keys` and `values` iterators.
8628 * std: Functions dealing with type size and alignment have moved from the
8629 `sys` module to the `mem` module.
8630 * std: The `path` module was written and API changed.
8631 * std: `str::from_utf8` has been changed to cast instead of allocate.
8632 * std: `starts_with` and `ends_with` methods added to vectors via the
8633 `ImmutableEqVector` trait, which is in the prelude.
8634 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8635 if the index is out of bounds.
8636 * std: Task failure no longer propagates between tasks, as the model was
8637 complex, expensive, and incompatible with thread-based tasks.
8638 * std: The `Any` type can be used for dynamic typing.
8639 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8641 * std: Methods that produce iterators generally do not have an `_iter`
8643 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8644 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8645 * std: `util::ignore` renamed to `prelude::drop`.
8646 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8648 * std: `vec::raw` has seen a lot of cleanup and API changes.
8649 * std: The standard library no longer includes any C++ code, and very
8650 minimal C, eliminating the dependency on libstdc++.
8651 * std: Runtime scheduling and I/O functionality has been factored out into
8652 extensible interfaces and is now implemented by two different crates:
8653 libnative, for native threading and I/O; and libgreen, for green threading
8654 and I/O. This paves the way for using the standard library in more limited
8655 embedded environments.
8656 * std: The `comm` module has been rewritten to be much faster, have a
8657 simpler, more consistent API, and to work for both native and green
8659 * std: All libuv dependencies have been moved into the rustuv crate.
8660 * native: New implementations of runtime scheduling on top of OS threads.
8661 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8663 * green: The green thread scheduler and message passing types are almost
8665 * extra: The `flatpipes` module had bitrotted and was removed.
8666 * extra: All crypto functions have been removed and Rust now has a policy of
8667 not reimplementing crypto in the standard library. In the future crypto
8668 will be provided by external crates with bindings to established libraries.
8669 * extra: `c_vec` has been modernized.
8670 * extra: The `sort` module has been removed. Use the `sort` method on
8674 * The `rust` and `rusti` commands have been removed, due to lack of
8676 * `rustdoc` was completely rewritten.
8677 * `rustdoc` can test code examples in documentation.
8678 * `rustpkg` can test packages with the argument, 'test'.
8679 * `rustpkg` supports arbitrary dependencies, including C libraries.
8680 * `rustc`'s support for generating debug info is improved again.
8681 * `rustc` has better error reporting for unbalanced delimiters.
8682 * `rustc`'s JIT support was removed due to bitrot.
8683 * Executables and static libraries can be built with LTO (-Z lto)
8684 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8688 Version 0.8 (2013-09-26)
8689 ============================
8691 * ~2200 changes, numerous bugfixes
8694 * The `for` loop syntax has changed to work with the `Iterator` trait.
8695 * At long last, unwinding works on Windows.
8696 * Default methods are ready for use.
8697 * Many trait inheritance bugs fixed.
8698 * Owned and borrowed trait objects work more reliably.
8699 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8700 * rustc can omit emission of code for the `debug!` macro if it is passed
8702 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8703 for foo.rs, then foo/mod.rs, and will generate an error when both are
8705 * Strings no longer contain trailing nulls. The new `std::c_str` module
8706 provides new mechanisms for converting to C strings.
8707 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8708 * The FFI has been overhauled such that foreign functions are called directly,
8709 instead of through a stack-switching wrapper.
8710 * Calling a foreign function must be done through a Rust function with the
8711 `#[fixed_stack_segment]` attribute.
8712 * The `externfn!` macro can be used to declare both a foreign function and
8713 a `#[fixed_stack_segment]` wrapper at once.
8714 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8715 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8716 * `priv` is disallowed everywhere except for struct fields and enum variants.
8717 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8718 * `ref` bindings in irrefutable patterns work correctly now.
8719 * `char` is now prevented from containing invalid code points.
8720 * Casting to `bool` is no longer allowed.
8721 * `\0` is now accepted as an escape in chars and strings.
8722 * `yield` is a reserved keyword.
8723 * `typeof` is a reserved keyword.
8724 * Crates may be imported by URL with `extern mod foo = "url";`.
8725 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8726 * Static vectors can be initialized with repeating elements,
8727 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8728 * Static structs can be initialized with functional record update,
8729 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8730 * `cfg!` can be used to conditionally execute code based on the crate
8731 configuration, similarly to `#[cfg(...)]`.
8732 * The `unnecessary_qualification` lint detects unneeded module
8733 prefixes (default: allow).
8734 * Arithmetic operations have been implemented on the SIMD types in
8735 `std::unstable::simd`.
8736 * Exchange allocation headers were removed, reducing memory usage.
8737 * `format!` implements a completely new, extensible, and higher-performance
8738 string formatting system. It will replace `fmt!`.
8739 * `print!` and `println!` write formatted strings (using the `format!`
8740 extension) to stdout.
8741 * `write!` and `writeln!` write formatted strings (using the `format!`
8742 extension) to the new Writers in `std::rt::io`.
8743 * The library section in which a function or static is placed may
8744 be specified with `#[link_section = "..."]`.
8745 * The `proto!` syntax extension for defining bounded message protocols
8747 * `macro_rules!` is hygienic for `let` declarations.
8748 * The `#[export_name]` attribute specifies the name of a symbol.
8749 * `unreachable!` can be used to indicate unreachable code, and fails
8753 * std: Transitioned to the new runtime, written in Rust.
8754 * std: Added an experimental I/O library, `rt::io`, based on the new
8756 * std: A new generic `range` function was added to the prelude, replacing
8757 `uint::range` and friends.
8758 * std: `range_rev` no longer exists. Since range is an iterator it can be
8759 reversed with `range(lo, hi).invert()`.
8760 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8761 renamed to `unwrap_or`.
8762 * std: The `iterator` module was renamed to `iter`.
8763 * std: Integral types now support the `checked_add`, `checked_sub`, and
8764 `checked_mul` operations for detecting overflow.
8765 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8767 * std: Methods are standardizing on conventions for casting methods:
8768 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8770 * std: The `CString` type in `c_str` provides new ways to convert to and
8772 * std: `DoubleEndedIterator` can yield elements in two directions.
8773 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8775 * std: `str::from_bytes` renamed to `str::from_utf8`.
8776 * std: `pop_opt` and `shift_opt` methods added to vectors.
8777 * std: The task-local data interface no longer uses @, and keys are
8778 no longer function pointers.
8779 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8780 * std: Added `SharedPort` to `comm`.
8781 * std: `Eq` has a default method for `ne`; only `eq` is required
8783 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8784 is required in implementations.
8785 * std: `is_utf8` performance is improved, impacting many string functions.
8786 * std: `os::MemoryMap` provides cross-platform mmap.
8787 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8788 are not 'in-bounds' are considered undefined.
8789 * std: Many freestanding functions in `vec` removed in favor of methods.
8790 * std: Many freestanding functions on scalar types removed in favor of
8792 * std: Many options to task builders were removed since they don't make
8793 sense in the new scheduler design.
8794 * std: More containers implement `FromIterator` so can be created by the
8796 * std: More complete atomic types in `unstable::atomics`.
8797 * std: `comm::PortSet` removed.
8798 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8799 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8800 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8801 default implementations.
8802 * std: Various `from_str` functions were removed in favor of a generic
8803 `from_str` which is available in the prelude.
8804 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8805 * extra: `dlist`, the doubly-linked list was modernized.
8806 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8807 * extra: Added `glob` module, replacing `std::os::glob`.
8808 * extra: `rope` was removed.
8809 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8810 * extra: `net`, and `timer` were removed. The experimental replacements
8811 are `std::rt::io::net` and `std::rt::io::timer`.
8812 * extra: Iterators implemented for `SmallIntMap`.
8813 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8814 * extra: `SmallIntSet` removed. Use `BitvSet`.
8815 * extra: Performance of JSON parsing greatly improved.
8816 * extra: `semver` updated to SemVer 2.0.0.
8817 * extra: `term` handles more terminals correctly.
8818 * extra: `dbg` module removed.
8819 * extra: `par` module removed.
8820 * extra: `future` was cleaned up, with some method renames.
8821 * extra: Most free functions in `getopts` were converted to methods.
8824 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8825 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8826 similarly to gcc's `--march` flag.
8827 * rustc's performance compiling small crates is much better.
8828 * rustpkg has received many improvements.
8829 * rustpkg supports git tags as package IDs.
8830 * rustpkg builds into target-specific directories so it can be used for
8832 * The number of concurrent test tasks is controlled by the environment
8833 variable RUST_TEST_TASKS.
8834 * The test harness can now report metrics for benchmarks.
8835 * All tools have man pages.
8836 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8837 * The runtime uses jemalloc for allocations.
8838 * Segmented stacks are temporarily disabled as part of the transition to
8839 the new runtime. Stack overflows are possible!
8840 * A new documentation backend, rustdoc_ng, is available for use. It is
8841 still invoked through the normal `rustdoc` command.
8844 Version 0.7 (2013-07-03)
8845 =======================
8847 * ~2000 changes, numerous bugfixes
8850 * `impl`s no longer accept a visibility qualifier. Put them on methods
8852 * The borrow checker has been rewritten with flow-sensitivity, fixing
8853 many bugs and inconveniences.
8854 * The `self` parameter no longer implicitly means `&'self self`,
8855 and can be explicitly marked with a lifetime.
8856 * Overloadable compound operators (`+=`, etc.) have been temporarily
8857 removed due to bugs.
8858 * The `for` loop protocol now requires `for`-iterators to return `bool`
8859 so they compose better.
8860 * The `Durable` trait is replaced with the `'static` bounds.
8861 * Trait default methods work more often.
8862 * Structs with the `#[packed]` attribute have byte alignment and
8863 no padding between fields.
8864 * Type parameters bound by `Copy` must now be copied explicitly with
8866 * It is now illegal to move out of a dereferenced unsafe pointer.
8867 * `Option<~T>` is now represented as a nullable pointer.
8868 * `@mut` does dynamic borrow checks correctly.
8869 * The `main` function is only detected at the topmost level of the crate.
8870 The `#[main]` attribute is still valid anywhere.
8871 * Struct fields may no longer be mutable. Use inherited mutability.
8872 * The `#[no_send]` attribute makes a type that would otherwise be
8874 * The `#[no_freeze]` attribute makes a type that would otherwise be
8876 * Unbounded recursion will abort the process after reaching the limit
8877 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8878 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8879 are never implicitly copyable.
8880 * `#[static_assert]` makes compile-time assertions about static bools.
8881 * At long last, 'argument modes' no longer exist.
8882 * The rarely used `use mod` statement no longer exists.
8885 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8887 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8888 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8890 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8891 and unsuffixed integer literals.
8894 * The `core` crate was renamed to `std`.
8895 * The `std` crate was renamed to `extra`.
8896 * More and improved documentation.
8897 * std: `iterator` module for external iterator objects.
8898 * Many old-style (internal, higher-order function) iterators replaced by
8899 implementations of `Iterator`.
8900 * std: Many old internal vector and string iterators,
8901 incl. `any`, `all`. removed.
8902 * std: The `finalize` method of `Drop` renamed to `drop`.
8903 * std: The `drop` method now takes `&mut self` instead of `&self`.
8904 * std: The prelude no longer re-exports any modules, only types and traits.
8905 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8906 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8907 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8908 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8909 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8910 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8911 * std: Many types implement `Clone`.
8912 * std: `path` type renamed to `Path`.
8913 * std: `mut` module and `Mut` type removed.
8914 * std: Many standalone functions removed in favor of methods and iterators
8915 in `vec`, `str`. In the future methods will also work as functions.
8916 * std: `reinterpret_cast` removed. Use `transmute`.
8917 * std: ascii string handling in `std::ascii`.
8918 * std: `Rand` is implemented for ~/@.
8919 * std: `run` module for spawning processes overhauled.
8920 * std: Various atomic types added to `unstable::atomic`.
8921 * std: Various types implement `Zero`.
8922 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8923 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8924 * std: Added `os::mkdir_recursive`.
8925 * std: Added `os::glob` function performs filesystems globs.
8926 * std: `FuzzyEq` renamed to `ApproxEq`.
8927 * std: `Map` now defines `pop` and `swap` methods.
8928 * std: `Cell` constructors converted to static methods.
8929 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8930 * extra: `flate` module moved from `std` to `extra`.
8931 * extra: `fileinput` module for iterating over a series of files.
8932 * extra: `Complex` number type and `complex` module.
8933 * extra: `Rational` number type and `rational` module.
8934 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8935 * extra: `term` uses terminfo now, is more correct.
8936 * extra: `arc` functions converted to methods.
8937 * extra: Implementation of fixed output size variations of SHA-2.
8940 * `unused_variables` lint mode for unused variables (default: warn).
8941 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8943 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8945 * `dead_assignment` lint mode for unread variables (default: warn).
8946 * `unnecessary_allocation` lint mode detects some heap allocations that are
8947 immediately borrowed so could be written without allocating (default: warn).
8948 * `missing_doc` lint mode (default: allow).
8949 * `unreachable_code` lint mode (default: warn).
8950 * The `rusti` command has been rewritten and a number of bugs addressed.
8951 * rustc outputs in color on more terminals.
8952 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8953 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8954 * Compiling with `-g` will make the binary record information about
8955 dynamic borrowcheck failures for debugging.
8956 * rustdoc has a nicer stylesheet.
8957 * Various improvements to rustdoc.
8958 * Improvements to rustpkg (see the detailed release notes).
8961 Version 0.6 (2013-04-03)
8962 ========================
8964 * ~2100 changes, numerous bugfixes
8967 * The self type parameter in traits is now spelled `Self`
8968 * The `self` parameter in trait and impl methods must now be explicitly
8969 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8970 * Static methods no longer require the `static` keyword and instead
8971 are distinguished by the lack of a `self` parameter
8972 * Replaced the `Durable` trait with the `'static` lifetime
8973 * The old closure type syntax with the trailing sigil has been
8974 removed in favor of the more consistent leading sigil
8975 * `super` is a keyword, and may be prefixed to paths
8976 * Trait bounds are separated with `+` instead of whitespace
8977 * Traits are implemented with `impl Trait for Type`
8978 instead of `impl Type: Trait`
8979 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8980 * The `export` keyword has finally been removed
8981 * The `move` keyword has been removed (see "Semantic changes")
8982 * The interior mutability qualifier on vectors, `[mut T]`, has been
8983 removed. Use `&mut [T]`, etc.
8984 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8985 * `fail` is no longer a keyword. Use `fail!()`
8986 * `assert` is no longer a keyword. Use `assert!()`
8987 * `log` is no longer a keyword. use `debug!`, etc.
8988 * 1-tuples may be represented as `(T,)`
8989 * Struct fields may no longer be `mut`. Use inherited mutability,
8990 `@mut T`, `core::mut` or `core::cell`
8991 * `extern mod { ... }` is no longer valid syntax for foreign
8992 function modules. Use extern blocks: `extern { ... }`
8993 * Newtype enums removed. Use tuple-structs.
8994 * Trait implementations no longer support visibility modifiers
8995 * Pattern matching over vectors improved and expanded
8996 * `const` renamed to `static` to correspond to lifetime name,
8997 and make room for future `static mut` unsafe mutable globals.
8998 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8999 * `Clone` implementations can be automatically generated with
9000 `#[deriving(Clone)]`
9001 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9002 instead of `foo as Bar`.
9003 * Fixed length vector types are now written as `[int, .. 3]`
9004 instead of `[int * 3]`.
9005 * Fixed length vector types can express the length as a constant
9006 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9009 * Types with owned pointers or custom destructors move by default,
9010 eliminating the `move` keyword
9011 * All foreign functions are considered unsafe
9012 * &mut is now unaliasable
9013 * Writes to borrowed @mut pointers are prevented dynamically
9015 * The name of the main function can be customized using #[main]
9016 * The default type of an inferred closure is &fn instead of @fn
9017 * `use` statements may no longer be "chained" - they cannot import
9018 identifiers imported by previous `use` statements
9019 * `use` statements are crate relative, importing from the "top"
9020 of the crate by default. Paths may be prefixed with `super::`
9021 or `self::` to change the search behavior.
9022 * Method visibility is inherited from the implementation declaration
9023 * Structural records have been removed
9024 * Many more types can be used in static items, including enums
9025 'static-lifetime pointers and vectors
9026 * Pattern matching over vectors improved and expanded
9027 * Typechecking of closure types has been overhauled to
9028 improve inference and eliminate unsoundness
9029 * Macros leave scope at the end of modules, unless that module is
9030 tagged with #[macro_escape]
9033 * Added big integers to `std::bigint`
9034 * Removed `core::oldcomm` module
9035 * Added pipe-based `core::comm` module
9036 * Numeric traits have been reorganized under `core::num`
9037 * `vec::slice` finally returns a slice
9038 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9039 * Containers reorganized around traits in `core::container`
9040 * `core::dvec` removed, `~[T]` is a drop-in replacement
9041 * `core::send_map` renamed to `core::hashmap`
9042 * `std::map` removed; replaced with `core::hashmap`
9043 * `std::treemap` reimplemented as an owned balanced tree
9044 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9045 * `core::trie` added as a fast ordered map for integer keys
9046 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9047 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9048 overload the comparison operators, whereas `TotalOrd` is used
9049 by certain container types
9052 * Replaced the 'cargo' package manager with 'rustpkg'
9053 * Added all-purpose 'rust' tool
9054 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9055 * rustc now *attempts* to offer spelling suggestions
9056 * Improved support for ARM and Android
9057 * Preliminary MIPS backend
9058 * Improved foreign function ABI implementation for x86, x86_64
9059 * Various memory usage improvements
9060 * Rust code may be embedded in foreign code under limited circumstances
9061 * Inline assembler supported by new asm!() syntax extension.
9064 Version 0.5 (2012-12-21)
9065 ===========================
9067 * ~900 changes, numerous bugfixes
9070 * Removed `<-` move operator
9071 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9072 * Removed old fixed length vector syntax - `[T]/N`
9073 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9074 * Macros may now expand to items and statements
9075 * `a.b()` is always parsed as a method call, never as a field projection
9076 * `Eq` and `IterBytes` implementations can be automatically generated
9077 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9078 * Removed the special crate language for `.rc` files
9079 * Function arguments may consist of any irrefutable pattern
9082 * `&` and `~` pointers may point to objects
9083 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9084 * Enum variants may be structs
9085 * Destructors can be added to all nominal types with the Drop trait
9086 * Structs and nullary enum variants may be constants
9087 * Values that cannot be implicitly copied are now automatically moved
9088 without writing `move` explicitly
9089 * `&T` may now be coerced to `*T`
9090 * Coercions happen in `let` statements as well as function calls
9091 * `use` statements now take crate-relative paths
9092 * The module and type namespaces have been merged so that static
9093 method names can be resolved under the trait in which they are
9096 * Improved support for language features
9097 * Trait inheritance works in many scenarios
9098 * More support for explicit self arguments in methods - `self`, `&self`
9099 `@self`, and `~self` all generally work as expected
9100 * Static methods work in more situations
9101 * Experimental: Traits may declare default methods for the implementations
9105 * New condition handling system in `core::condition`
9106 * Timsort added to `std::sort`
9107 * New priority queue, `std::priority_queue`
9108 * Pipes for serializable types, `std::flatpipes'
9109 * Serialization overhauled to be trait-based
9110 * Expanded `getopts` definitions
9111 * Moved futures to `std`
9112 * More functions are pure now
9113 * `core::comm` renamed to `oldcomm`. Still deprecated
9114 * `rustdoc` and `cargo` are libraries now
9117 * Added a preliminary REPL, `rusti`
9118 * License changed from MIT to dual MIT/APL2
9121 Version 0.4 (2012-10-15)
9122 ==========================
9124 * ~2000 changes, numerous bugfixes
9127 * All keywords are now strict and may not be used as identifiers anywhere
9128 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9129 'of', 'with', 'to', 'class'.
9130 * Classes are replaced with simpler structs
9131 * Explicit method self types
9132 * `ret` became `return` and `alt` became `match`
9133 * `import` is now `use`; `use is now `extern mod`
9134 * `extern mod { ... }` is now `extern { ... }`
9135 * `use mod` is the recommended way to import modules
9136 * `pub` and `priv` replace deprecated export lists
9137 * The syntax of `match` pattern arms now uses fat arrow (=>)
9138 * `main` no longer accepts an args vector; use `os::args` instead
9141 * Trait implementations are now coherent, ala Haskell typeclasses
9142 * Trait methods may be static
9143 * Argument modes are deprecated
9144 * Borrowed pointers are much more mature and recommended for use
9145 * Strings and vectors in the static region are stored in constant memory
9146 * Typestate was removed
9147 * Resolution rewritten to be more reliable
9148 * Support for 'dual-mode' data structures (freezing and thawing)
9151 * Most binary operators can now be overloaded via the traits in
9153 * `std::net::url` for representing URLs
9154 * Sendable hash maps in `core::send_map`
9155 * `core::task' gained a (currently unsafe) task-local storage API
9158 * An efficient new intertask communication primitive called the pipe,
9159 along with a number of higher-level channel types, in `core::pipes`
9160 * `std::arc`, an atomically reference counted, immutable, shared memory
9162 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9163 * Futures are now based on pipes and sendable
9164 * More robust linked task failure
9165 * Improved task builder API
9168 * Improved error reporting
9169 * Preliminary JIT support
9170 * Preliminary work on precise GC
9171 * Extensive architectural improvements to rustc
9172 * Begun a transition away from buggy C++-based reflection (shape) code to
9173 Rust-based (visitor) code
9174 * All hash functions and tables converted to secure, randomized SipHash
9177 Version 0.3 (2012-07-12)
9178 ========================
9180 * ~1900 changes, numerous bugfixes
9182 * New coding conveniences
9183 * Integer-literal suffix inference
9184 * Per-item control over warnings, errors
9185 * #[cfg(windows)] and #[cfg(unix)] attributes
9186 * Documentation comments
9187 * More compact closure syntax
9188 * 'do' expressions for treating higher-order functions as
9190 * *-patterns (wildcard extended to all constructor fields)
9193 * Name resolution pass and exhaustiveness checker rewritten
9194 * Region pointers and borrow checking supersede alias
9196 * Init-ness checking is now provided by a region-based liveness
9197 pass instead of the typestate pass; same for last-use analysis
9198 * Extensive work on region pointers
9200 * Experimental new language features
9201 * Slices and fixed-size, interior-allocated vectors
9202 * #!-comments for lang versioning, shell execution
9203 * Destructors and iface implementation for classes;
9204 type-parameterized classes and class methods
9205 * 'const' type kind for types that can be used to implement
9206 shared-memory concurrency patterns
9210 * Removal of various obsolete features
9211 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9212 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9214 * Constructs: do-while loops ('do' repurposed), fn binding,
9215 resources (replaced by destructors)
9217 * Compiler reorganization
9218 * Syntax-layer of compiler split into separate crate
9219 * Clang (from LLVM project) integrated into build
9220 * Typechecker split into sub-modules
9223 * New time functions
9224 * Extension methods for many built-in types
9225 * Arc: atomic-refcount read-only / exclusive-use shared cells
9226 * Par: parallel map and search routines
9227 * Extensive work on libuv interface
9228 * Much vector code moved to libraries
9229 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9230 #include, #include_str, #include_bin
9233 * Cargo automatically resolves dependencies
9236 Version 0.2 (2012-03-29)
9237 =========================
9239 * >1500 changes, numerous bugfixes
9241 * New docs and doc tooling
9243 * New port: FreeBSD x86_64
9245 * Compilation model enhancements
9246 * Generics now specialized, multiply instantiated
9247 * Functions now inlined across separate crates
9249 * Scheduling, stack and threading fixes
9250 * Noticeably improved message-passing performance
9251 * Explicit schedulers
9255 * Experimental new language features
9256 * Operator overloading
9260 * Various language extensions
9261 * C-callback function types: 'crust fn ...'
9262 * Infinite-loop construct: 'loop { ... }'
9263 * Shorten 'mutable' to 'mut'
9264 * Required mutable-local qualifier: 'let mut ...'
9265 * Basic glob-exporting: 'export foo::*;'
9266 * Alt now exhaustive, 'alt check' for runtime-checked
9267 * Block-function form of 'for' loop, with 'break' and 'ret'.
9270 * AST quasi-quote syntax extension
9271 * Revived libuv interface
9272 * New modules: core::{future, iter}, std::arena
9273 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9274 * Extensive cleanup, regularization in libstd, libcore
9277 Version 0.1 (2012-01-20)
9278 ===============================
9280 * Most language features work, including:
9281 * Unique pointers, unique closures, move semantics
9282 * Interface-constrained generics
9283 * Static interface dispatch
9285 * Multithread task scheduling
9286 * Typestate predicates
9287 * Failure unwinding, destructors
9288 * Pattern matching and destructuring assignment
9289 * Lightweight block-lambda syntax
9290 * Preliminary macro-by-example
9292 * Compiler works with the following configurations:
9293 * Linux: x86 and x86_64 hosts and targets
9294 * macOS: x86 and x86_64 hosts and targets
9295 * Windows: x86 hosts and targets
9297 * Cross compilation / multi-target configuration supported.
9299 * Preliminary API-documentation and package-management tools included.
9303 * Documentation is incomplete.
9305 * Performance is below intended target.
9307 * Standard library APIs are subject to extensive change, reorganization.
9309 * Language-level versioning is not yet operational - future code will