1 Version 1.48.0 (2020-11-19)
2 ==========================
7 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
8 is still rejected *semantically*, but can now be parsed by procedural macros.
12 - [Stabilised the `-C link-self-contained=<yes|no>`][76158] Which tells `rustc` whether to link
13 its own libraries or to rely on a external linker. (supported only on
14 `windows-gnu`, `linux-musl`, and `wasi` platforms.)
15 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
16 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
18 \* Refer to Rust's [platform support page][forge-platform-support] for more
19 information on Rust's tiered platform support.
23 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
24 and `&Stderr`.][76275]
25 - [All arrays now implement `TryFrom<Vec<T>>`.][76310]
26 - [The `matches!` macro now supports having a trailing comma.][74880]
27 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
28 - [Nearly all of `Cell`'s panicking functions now use the `#[track_caller]`
33 - [`slice::as_ptr_range`]
34 - [`slice::as_mut_ptr_range`]
35 - [`VecDeque::make_contiguous`]
39 The following previously stable methods are now `const fn`'s:
47 - [`Ordering::reverse`]
55 - [You can now link to different items in `rustdoc` using the intra-doc link
56 syntax.][74430] E.g. ``/// Uses [`std::future`] `` will automatically generate
57 a link to `std::future`'s documentation. See ["Linking to items by
58 name"][intradoc-links] for more information.
59 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
60 when searching through `rustdoc`'s UI.][75740]
61 - [You can now use `rustup install <major>.<minor>` to specify installing the
62 latest availeble patch of that minor version of the toolchain.][76107] E.g.
63 `rustup install 1.45` would install `1.45.2`, and `1.46` would install `1.46.0`.
67 - [`const fn`s are now implicitly promoted to `const`.][75502] Meaning that it
68 will only warn if your code fails `const` evaluation, and not produce an error.
69 - [Associated type bindings on trait objects are now verified to meet the bounds
70 declared on the trait when checking that they implement the trait.][27675]
71 - [When traits bounds on associated types or opaque types are ambiguous the
72 compiler no longer makes an arbitrary choice on which bound to use.][54121]
73 - [Fixed recursive nonterminals not being expended in macros during
74 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
75 correctly handling recursive nonterminal tokens.
76 - [`&mut` references to non zero-sized types are not longer promoted.][75585]
77 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
78 in places where they have no effect.][73461]
79 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
80 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
86 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
87 You can continue building with `make` by setting `ninja=false` in
90 [27675]: https://github.com/rust-lang/rust/issues/27675/
91 [54121]: https://github.com/rust-lang/rust/issues/54121/
92 [77386]: https://github.com/rust-lang/rust/pull/77386/
93 [77153]: https://github.com/rust-lang/rust/pull/77153/
94 [77055]: https://github.com/rust-lang/rust/pull/77055/
95 [76275]: https://github.com/rust-lang/rust/pull/76275/
96 [76310]: https://github.com/rust-lang/rust/pull/76310/
97 [76420]: https://github.com/rust-lang/rust/pull/76420/
98 [76107]: https://github.com/rust-lang/rust/pull/76107/
99 [76158]: https://github.com/rust-lang/rust/pull/76158/
100 [75857]: https://github.com/rust-lang/rust/pull/75857/
101 [75585]: https://github.com/rust-lang/rust/pull/75585/
102 [75740]: https://github.com/rust-lang/rust/pull/75740/
103 [75502]: https://github.com/rust-lang/rust/pull/75502/
104 [74880]: https://github.com/rust-lang/rust/pull/74880/
105 [74922]: https://github.com/rust-lang/rust/pull/74922/
106 [74430]: https://github.com/rust-lang/rust/pull/74430/
107 [74194]: https://github.com/rust-lang/rust/pull/74194/
108 [73461]: https://github.com/rust-lang/rust/pull/73461/
109 [73166]: https://github.com/rust-lang/rust/pull/73166/
110 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
111 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
112 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
113 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
114 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
115 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
116 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
117 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
118 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
119 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
120 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
121 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
122 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
123 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
126 Version 1.47.0 (2020-10-08)
127 ==========================
131 - [Closures will now warn when not used.][74869]
135 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
136 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
138 - [Upgraded to LLVM 11.][73526]
139 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
140 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
141 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
143 \* Refer to Rust's [platform support page][forge-platform-support] for more
144 information on Rust's tiered platform support.
148 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
149 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
150 those of length less than 33.][74060]
151 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
152 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
153 `PartialEq`, and `PartialOrd`.][73583]
158 - [`Range::is_empty`]
159 - [`RangeInclusive::is_empty`]
160 - [`Result::as_deref`]
161 - [`Result::as_deref_mut`]
163 - [`pointer::offset_from`]
167 The following previously stable APIs have now been made const.
169 - [The `new` method for all `NonZero` integers.][73858]
170 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
171 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
172 methods for all integers.][73858]
173 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
174 signed integers.][73858]
175 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
176 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
177 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
178 `is_ascii_control` methods for `char` and `u8`.][73858]
182 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
183 You can override this by setting the following in your `Cargo.toml`.
185 [profile.release.build-override]
188 - [`cargo-help` will now display man pages for commands rather just the
189 `--help` text.][cargo/8456]
190 - [`cargo-metadata` now emits a `test` field indicating if a target has
191 tests enabled.][cargo/8478]
192 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
193 - [`cargo-publish` will now use an alternative registry by default if it's the
194 only registry specified in `package.publish`.][cargo/8571]
198 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
199 type based search.][75366]
200 - [Added the Ayu theme to rustdoc.][71237]
204 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
205 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
206 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
207 help to preserve more span information.][73084] These changes may cause
208 compiliation errors if your macro was unhygenic or didn't correctly handle
210 - [Moved support for the CloudABI target to tier 3.][75568]
211 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
212 - [Added the `rustc-docs` component.][75560] This allows you to install
213 and read the documentation for the compiler internal APIs. (Currently only
214 available for `x86_64-unknown-linux-gnu`.)
218 - [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.
220 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
221 [75048]: https://github.com/rust-lang/rust/pull/75048/
222 [74163]: https://github.com/rust-lang/rust/pull/74163/
223 [71237]: https://github.com/rust-lang/rust/pull/71237/
224 [74869]: https://github.com/rust-lang/rust/pull/74869/
225 [73858]: https://github.com/rust-lang/rust/pull/73858/
226 [75716]: https://github.com/rust-lang/rust/pull/75716/
227 [75908]: https://github.com/rust-lang/rust/pull/75908/
228 [75516]: https://github.com/rust-lang/rust/pull/75516/
229 [75560]: https://github.com/rust-lang/rust/pull/75560/
230 [75568]: https://github.com/rust-lang/rust/pull/75568/
231 [75366]: https://github.com/rust-lang/rust/pull/75366/
232 [75204]: https://github.com/rust-lang/rust/pull/75204/
233 [74650]: https://github.com/rust-lang/rust/pull/74650/
234 [74419]: https://github.com/rust-lang/rust/pull/74419/
235 [73964]: https://github.com/rust-lang/rust/pull/73964/
236 [74021]: https://github.com/rust-lang/rust/pull/74021/
237 [74060]: https://github.com/rust-lang/rust/pull/74060/
238 [73893]: https://github.com/rust-lang/rust/pull/73893/
239 [73526]: https://github.com/rust-lang/rust/pull/73526/
240 [73583]: https://github.com/rust-lang/rust/pull/73583/
241 [73084]: https://github.com/rust-lang/rust/pull/73084/
242 [73197]: https://github.com/rust-lang/rust/pull/73197/
243 [72488]: https://github.com/rust-lang/rust/pull/72488/
244 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
245 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
246 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
247 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
248 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
249 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
250 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
251 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
252 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
253 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
254 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
255 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
256 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
257 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
258 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
261 Version 1.46.0 (2020-08-27)
262 ==========================
266 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
267 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
268 const functions.][73862]
269 - [The `#[track_caller]` attribute can now be added to functions to use the
270 function's caller's location information for panic messages.][72445]
271 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
272 `x.0.0` over `(x.0).0`.
273 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
274 You currently can't use `mem::transmute` in constant functions.
278 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
279 - [Enabled static "Position Independent Executables" by default
280 for `x86_64-unknown-linux-musl`.][70740]
284 - [`mem::forget` is now a `const fn`.][73887]
285 - [`String` now implements `From<char>`.][73466]
286 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
287 integer types.][73032]
288 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
289 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
290 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
291 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
292 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
293 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
298 - [`vec::Drain::as_slice`]
302 Added a number of new environment variables that are now available when
303 compiling your crate.
305 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
306 the specific binary being compiled and the name of the crate.
307 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
308 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
312 - [The target configuration option `abi_blacklist` has been renamed
313 to `unsupported_abis`.][74150] The old name will still continue to work.
314 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
315 This was previously accepted but will become a hard error in a future release.
316 - [Rustc will fail to compile if you have a struct with
317 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
319 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
320 ensure that spans have the correct information, and may cause breakage if you
321 were relying on receiving spans with dummy information.
322 - [The InnoSetup installer for Windows is no longer available.][72569] This was
323 a legacy installer that was replaced by a MSI installer a few years ago but
324 was still being built.
325 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
326 - [Rustc will no longer accept overlapping trait implementations that only
327 differ in how the lifetime was bound.][72493]
328 - [Rustc now correctly relates the lifetime of an existential associated
329 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
330 you to pass a shorter lifetime than expected.
331 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
332 The library will need to be installed for `rustc` to work, even though we
333 expect it to be already available on most systems.
334 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
336 - [Pretty printing of some tokens in procedural macros changed.][75453] The
337 exact output returned by rustc's pretty printing is an unstable
338 implementation detail: we recommend any macro relying on it to switch to a
339 more robust parsing system.
341 [75453]: https://github.com/rust-lang/rust/issues/75453/
342 [74820]: https://github.com/rust-lang/rust/issues/74820/
343 [74420]: https://github.com/rust-lang/rust/issues/74420/
344 [74109]: https://github.com/rust-lang/rust/pull/74109/
345 [74150]: https://github.com/rust-lang/rust/pull/74150/
346 [73862]: https://github.com/rust-lang/rust/pull/73862/
347 [73887]: https://github.com/rust-lang/rust/pull/73887/
348 [73466]: https://github.com/rust-lang/rust/pull/73466/
349 [73516]: https://github.com/rust-lang/rust/pull/73516/
350 [73293]: https://github.com/rust-lang/rust/pull/73293/
351 [73007]: https://github.com/rust-lang/rust/pull/73007/
352 [73032]: https://github.com/rust-lang/rust/pull/73032/
353 [72920]: https://github.com/rust-lang/rust/pull/72920/
354 [72569]: https://github.com/rust-lang/rust/pull/72569/
355 [72583]: https://github.com/rust-lang/rust/pull/72583/
356 [72584]: https://github.com/rust-lang/rust/pull/72584/
357 [72717]: https://github.com/rust-lang/rust/pull/72717/
358 [72437]: https://github.com/rust-lang/rust/pull/72437/
359 [72445]: https://github.com/rust-lang/rust/pull/72445/
360 [72486]: https://github.com/rust-lang/rust/pull/72486/
361 [72493]: https://github.com/rust-lang/rust/pull/72493/
362 [72331]: https://github.com/rust-lang/rust/pull/72331/
363 [71896]: https://github.com/rust-lang/rust/pull/71896/
364 [71660]: https://github.com/rust-lang/rust/pull/71660/
365 [71322]: https://github.com/rust-lang/rust/pull/71322/
366 [70740]: https://github.com/rust-lang/rust/pull/70740/
367 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
368 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
369 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
370 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
371 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
374 Version 1.45.2 (2020-08-03)
375 ==========================
377 * [Fix bindings in tuple struct patterns][74954]
378 * [Fix track_caller integration with trait objects][74784]
380 [74954]: https://github.com/rust-lang/rust/issues/74954
381 [74784]: https://github.com/rust-lang/rust/issues/74784
384 Version 1.45.1 (2020-07-30)
385 ==========================
387 * [Fix const propagation with references.][73613]
388 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
389 * [Avoid spurious implicit region bound.][74509]
390 * [Install clippy on x.py install][74457]
392 [73613]: https://github.com/rust-lang/rust/pull/73613
393 [73078]: https://github.com/rust-lang/rust/issues/73078
394 [74509]: https://github.com/rust-lang/rust/pull/74509
395 [74457]: https://github.com/rust-lang/rust/pull/74457
398 Version 1.45.0 (2020-07-16)
399 ==========================
403 - [Out of range float to int conversions using `as` has been defined as a saturating
404 conversion.][71269] This was previously undefined behaviour, but you can use the
405 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
406 may be desirable in rare performance sensitive situations.
407 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
409 - [Function like procedural macros can now be used in expression, pattern, and statement
410 positions.][68717] This means you can now use a function-like procedural macro
411 anywhere you can use a declarative (`macro_rules!`) macro.
415 - [You can now override individual target features through the `target-feature`
416 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
417 equivalent to `-C target-feature=+avx2,+fma`.
418 - [Added the `force-unwind-tables` flag.][69984] This option allows
419 rustc to always generate unwind tables regardless of panic strategy.
420 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
421 to include LLVM bitcode into generated `rlib`s (this is on by default).
422 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
423 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
424 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
425 - [Upgraded to LLVM 10.][67759]
427 \* Refer to Rust's [platform support page][forge-platform-support] for more
428 information on Rust's tiered platform support.
433 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
435 - [`proc_macro::TokenStream` now implements `Default`.][72234]
436 - [You can now use `char` with
437 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
438 a range of codepoints.][72413] E.g.
439 you can now write the following;
441 for ch in 'a'..='z' {
445 // Prints "abcdefghijklmnopqrstuvwxyz"
447 - [`OsString` now implements `FromStr`.][71662]
448 - [The `saturating_neg` method has been added to all signed integer primitive
449 types, and the `saturating_abs` method has been added for all integer
450 primitive types.][71886]
451 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
452 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
454 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
455 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
456 integer types.][69813]
457 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
458 integer types.][72324]
459 - [The `fetch_update` method has been added to all atomic integer types.][71843]
464 - [`BTreeMap::remove_entry`]
466 - [`rc::Weak::as_ptr`]
467 - [`rc::Weak::from_raw`]
468 - [`rc::Weak::into_raw`]
469 - [`str::strip_prefix`]
470 - [`str::strip_suffix`]
471 - [`sync::Weak::as_ptr`]
472 - [`sync::Weak::from_raw`]
473 - [`sync::Weak::into_raw`]
474 - [`char::UNICODE_VERSION`]
475 - [`Span::resolved_at`]
476 - [`Span::located_at`]
477 - [`Span::mixed_site`]
478 - [`unix::process::CommandExt::arg0`]
483 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
488 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
489 `~~outdated information~~` becomes "~~outdated information~~".
490 - [Added an emoji to Rustdoc's deprecated API message.][72014]
494 - [Trying to self initialize a static value (that is creating a value using
495 itself) is unsound and now causes a compile error.][71140]
496 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
497 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
498 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
499 previously undocumented and not intended for public use. Rustdoc still provides
500 a non-zero exit code on errors.
501 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
502 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
503 flags while cargo is adding `embed-bitcode` itself. The recommended way to
504 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
505 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
509 - [Make clippy a git subtree instead of a git submodule][70655]
510 - [Unify the undo log of all snapshot types][69464]
512 [71848]: https://github.com/rust-lang/rust/issues/71848/
513 [73420]: https://github.com/rust-lang/rust/issues/73420/
514 [72324]: https://github.com/rust-lang/rust/pull/72324/
515 [71843]: https://github.com/rust-lang/rust/pull/71843/
516 [71886]: https://github.com/rust-lang/rust/pull/71886/
517 [72234]: https://github.com/rust-lang/rust/pull/72234/
518 [72239]: https://github.com/rust-lang/rust/pull/72239/
519 [72397]: https://github.com/rust-lang/rust/pull/72397/
520 [72413]: https://github.com/rust-lang/rust/pull/72413/
521 [72014]: https://github.com/rust-lang/rust/pull/72014/
522 [72062]: https://github.com/rust-lang/rust/pull/72062/
523 [72094]: https://github.com/rust-lang/rust/pull/72094/
524 [72133]: https://github.com/rust-lang/rust/pull/72133/
525 [67759]: https://github.com/rust-lang/rust/pull/67759/
526 [71900]: https://github.com/rust-lang/rust/pull/71900/
527 [71928]: https://github.com/rust-lang/rust/pull/71928/
528 [71662]: https://github.com/rust-lang/rust/pull/71662/
529 [71716]: https://github.com/rust-lang/rust/pull/71716/
530 [71447]: https://github.com/rust-lang/rust/pull/71447/
531 [71269]: https://github.com/rust-lang/rust/pull/71269/
532 [71095]: https://github.com/rust-lang/rust/pull/71095/
533 [71140]: https://github.com/rust-lang/rust/pull/71140/
534 [70655]: https://github.com/rust-lang/rust/pull/70655/
535 [70705]: https://github.com/rust-lang/rust/pull/70705/
536 [69984]: https://github.com/rust-lang/rust/pull/69984/
537 [69813]: https://github.com/rust-lang/rust/pull/69813/
538 [69464]: https://github.com/rust-lang/rust/pull/69464/
539 [68717]: https://github.com/rust-lang/rust/pull/68717/
540 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
541 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
542 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
543 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
544 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
545 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
546 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
547 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
548 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
549 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
550 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
551 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
552 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
553 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
554 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
555 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
556 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
559 Version 1.44.1 (2020-06-18)
560 ===========================
562 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
563 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
564 * [Fix crashes when finding backtrace on macOS.][71397]
565 * [Clippy applies lint levels into different files.][clippy/5356]
567 [71397]: https://github.com/rust-lang/rust/issues/71397
568 [73078]: https://github.com/rust-lang/rust/issues/73078
569 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
570 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
573 Version 1.44.0 (2020-06-04)
574 ==========================
578 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
579 - [Added the `unused_braces` lint.][70081]
581 **Syntax-only changes**
583 - [Expansion-driven outline module parsing][69838]
588 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
593 These are still rejected semantically, so you will likely receive an error but
594 these changes can be seen and parsed by macros and conditional compilation.
598 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
599 Additionally when in incremental mode rustc defaults to 256 codegen units.
600 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
601 a panic is thrown.][67502]
602 - [Added tier 3\* support for the `aarch64-unknown-none` and
603 `aarch64-unknown-none-softfloat` targets.][68334]
604 - [Added tier 3 support for `arm64-apple-tvos` and
605 `x86_64-apple-tvos` targets.][68191]
610 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
611 `vec![]` to be able to be used in `const` contexts.
612 - [`convert::Infallible` now implements `Hash`.][70281]
613 - [`OsString` now implements `DerefMut` and `IndexMut` returning
614 a `&mut OsStr`.][70048]
615 - [Unicode 13 is now supported.][69929]
616 - [`String` now implements `From<&mut str>`.][69661]
617 - [`IoSlice` now implements `Copy`.][69403]
618 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
619 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
620 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
621 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
622 integer types.][69373]
626 - [`PathBuf::with_capacity`]
627 - [`PathBuf::capacity`]
629 - [`PathBuf::reserve`]
630 - [`PathBuf::reserve_exact`]
631 - [`PathBuf::shrink_to_fit`]
632 - [`f32::to_int_unchecked`]
633 - [`f64::to_int_unchecked`]
634 - [`Layout::align_to`]
635 - [`Layout::pad_to_align`]
641 - [Added the `cargo tree` command which will print a tree graph of
642 your dependencies.][cargo/8062] E.g.
644 mdbook v0.3.2 (/Users/src/rust/mdbook)
646 │ ├── html5ever v0.24.0
648 │ │ │ └── cfg-if v0.1.9
650 │ │ └── markup5ever v0.9.0
651 │ │ ├── log v0.4.8 (*)
653 │ │ │ └── phf_shared v0.7.24
654 │ │ │ ├── siphasher v0.2.3
655 │ │ │ └── unicase v1.4.2
656 │ │ │ [build-dependencies]
657 │ │ │ └── version_check v0.1.5
660 You can also display dependencies on multiple versions of the same crate with
661 `cargo tree -d` (short for `cargo tree --duplicates`).
665 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
666 the version in the sidebar.][69494]
670 - [Rustc now correctly generates static libraries on Windows GNU targets with
671 the `.a` extension, rather than the previous `.lib`.][70937]
672 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
673 - [The `file_name` property in JSON output of macro errors now points the actual
674 source file rather than the previous format of `<NAME macros>`.][70969]
675 **Note:** this may not point to a file that actually exists on the user's system.
676 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
677 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
678 not allow zero initialization such as `NonZeroU8`.][66059] This was
679 previously a warning.
680 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
681 operator has been defined as a saturating operation.][71269] This was previously
682 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
683 continue using the current behaviour, which may be desirable in rare performance
684 sensitive situations.
688 These changes provide no direct user facing benefits, but represent significant
689 improvements to the internals and overall performance of rustc and
692 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
693 - [Replace big JS dict with JSON parsing.][71250]
695 [69373]: https://github.com/rust-lang/rust/pull/69373/
696 [66059]: https://github.com/rust-lang/rust/pull/66059/
697 [68191]: https://github.com/rust-lang/rust/pull/68191/
698 [68899]: https://github.com/rust-lang/rust/pull/68899/
699 [71147]: https://github.com/rust-lang/rust/pull/71147/
700 [71250]: https://github.com/rust-lang/rust/pull/71250/
701 [70937]: https://github.com/rust-lang/rust/pull/70937/
702 [70969]: https://github.com/rust-lang/rust/pull/70969/
703 [70632]: https://github.com/rust-lang/rust/pull/70632/
704 [70281]: https://github.com/rust-lang/rust/pull/70281/
705 [70345]: https://github.com/rust-lang/rust/pull/70345/
706 [70048]: https://github.com/rust-lang/rust/pull/70048/
707 [70081]: https://github.com/rust-lang/rust/pull/70081/
708 [70156]: https://github.com/rust-lang/rust/pull/70156/
709 [71269]: https://github.com/rust-lang/rust/pull/71269/
710 [69838]: https://github.com/rust-lang/rust/pull/69838/
711 [69929]: https://github.com/rust-lang/rust/pull/69929/
712 [69661]: https://github.com/rust-lang/rust/pull/69661/
713 [69778]: https://github.com/rust-lang/rust/pull/69778/
714 [69494]: https://github.com/rust-lang/rust/pull/69494/
715 [69403]: https://github.com/rust-lang/rust/pull/69403/
716 [69033]: https://github.com/rust-lang/rust/pull/69033/
717 [68692]: https://github.com/rust-lang/rust/pull/68692/
718 [68334]: https://github.com/rust-lang/rust/pull/68334/
719 [67502]: https://github.com/rust-lang/rust/pull/67502/
720 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
721 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
722 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
723 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
724 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
725 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
726 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
727 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
728 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
729 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
730 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
731 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
732 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
735 Version 1.43.1 (2020-05-07)
736 ===========================
738 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
739 * [Fixed the stabilization of AVX-512 features.][71473]
740 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
742 [71430]: https://github.com/rust-lang/rust/pull/71430
743 [71473]: https://github.com/rust-lang/rust/issues/71473
744 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
747 Version 1.43.0 (2020-04-23)
748 ==========================
752 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
753 the type inferred correctly.][68129]
754 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
756 **Syntax only changes**
757 - [Allow `type Foo: Ord` syntactically.][69361]
758 - [Fuse associated and extern items up to defaultness.][69194]
759 - [Syntactically allow `self` in all `fn` contexts.][68764]
760 - [Merge `fn` syntax + cleanup item parsing.][68728]
761 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
762 For example, you may now write:
764 macro_rules! mac_trait {
774 These are still rejected *semantically*, so you will likely receive an error but
775 these changes can be seen and parsed by macros and
776 conditional compilation.
781 - [You can now pass multiple lint flags to rustc to override the previous
782 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
783 everything in the `unused` lint group except `unused-variables` which
784 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
785 everything in the `unused` lint group **including** `unused-variables` since
786 the allow flag is specified before the deny flag (and therefore overridden).
787 - [rustc will now prefer your system MinGW libraries over its bundled libraries
788 if they are available on `windows-gnu`.][67429]
789 - [rustc now buffers errors/warnings printed in JSON.][69227]
793 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
794 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
795 respectively.][69538] **Note** These conversions are only available when `N`
797 - [You can now use associated constants on floats and integers directly, rather
798 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
799 `f32::NAN` with no imports.
800 - [`u8::is_ascii` is now `const`.][68984]
801 - [`String` now implements `AsMut<str>`.][68742]
802 - [Added the `primitive` module to `std` and `core`.][67637] This module
803 reexports Rust's primitive types. This is mainly useful in macros
804 where you want avoid these types being shadowed.
805 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
806 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
810 - [`Once::is_completed`]
815 - [`iter::once_with`]
819 - [You can now set config `[profile]`s in your `.cargo/config`, or through
820 your environment.][cargo/7823]
821 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
822 executable path when running integration tests or benchmarks.][cargo/7697]
823 `<name>` is the name of your binary as-is e.g. If you wanted the executable
824 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
828 - [Certain checks in the `const_err` lint were deemed unrelated to const
829 evaluation][69185], and have been moved to the `unconditional_panic` and
830 `arithmetic_overflow` lints.
835 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
836 has been a warning since 1.36.0.
837 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
838 led to some instances being accepted, and now correctly emits a hard error.
840 [69340]: https://github.com/rust-lang/rust/pull/69340
844 These changes provide no direct user facing benefits, but represent significant
845 improvements to the internals and overall performance of `rustc` and
848 - [All components are now built with `opt-level=3` instead of `2`.][67878]
849 - [Improved how rustc generates drop code.][67332]
850 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
851 - [traits: preallocate 2 Vecs of known initial size][69022]
852 - [Avoid exponential behaviour when relating types][68772]
853 - [Skip `Drop` terminators for enum variants without drop glue][68943]
854 - [Improve performance of coherence checks][68966]
855 - [Deduplicate types in the generator witness][68672]
856 - [Invert control in struct_lint_level.][68725]
858 [67332]: https://github.com/rust-lang/rust/pull/67332/
859 [67429]: https://github.com/rust-lang/rust/pull/67429/
860 [67637]: https://github.com/rust-lang/rust/pull/67637/
861 [67642]: https://github.com/rust-lang/rust/pull/67642/
862 [67878]: https://github.com/rust-lang/rust/pull/67878/
863 [67885]: https://github.com/rust-lang/rust/pull/67885/
864 [68129]: https://github.com/rust-lang/rust/pull/68129/
865 [68672]: https://github.com/rust-lang/rust/pull/68672/
866 [68725]: https://github.com/rust-lang/rust/pull/68725/
867 [68728]: https://github.com/rust-lang/rust/pull/68728/
868 [68738]: https://github.com/rust-lang/rust/pull/68738/
869 [68742]: https://github.com/rust-lang/rust/pull/68742/
870 [68764]: https://github.com/rust-lang/rust/pull/68764/
871 [68772]: https://github.com/rust-lang/rust/pull/68772/
872 [68943]: https://github.com/rust-lang/rust/pull/68943/
873 [68952]: https://github.com/rust-lang/rust/pull/68952/
874 [68966]: https://github.com/rust-lang/rust/pull/68966/
875 [68984]: https://github.com/rust-lang/rust/pull/68984/
876 [69022]: https://github.com/rust-lang/rust/pull/69022/
877 [69185]: https://github.com/rust-lang/rust/pull/69185/
878 [69194]: https://github.com/rust-lang/rust/pull/69194/
879 [69201]: https://github.com/rust-lang/rust/pull/69201/
880 [69227]: https://github.com/rust-lang/rust/pull/69227/
881 [69548]: https://github.com/rust-lang/rust/pull/69548/
882 [69256]: https://github.com/rust-lang/rust/pull/69256/
883 [69361]: https://github.com/rust-lang/rust/pull/69361/
884 [69366]: https://github.com/rust-lang/rust/pull/69366/
885 [69538]: https://github.com/rust-lang/rust/pull/69538/
886 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
887 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
888 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
889 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
890 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
891 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
892 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
893 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
896 Version 1.42.0 (2020-03-12)
897 ==========================
901 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
903 fn foo(words: &[&str]) {
905 ["Hello", "World", "!", ..] => println!("Hello World!"),
906 ["Foo", "Bar", ..] => println!("Baz"),
907 rest => println!("{:?}", rest),
911 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
912 that you can create an enum that has the exact layout and ABI of the type
914 - [There are some *syntax-only* changes:][67131]
915 - `default` is syntactically allowed before items in `trait` definitions.
916 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
917 leave out their bodies in favor of `;`.
918 - Bounds on associated types in `impl`s are now syntactically allowed
919 (e.g. `type Foo: Ord;`).
920 - `...` (the C-variadic type) may occur syntactically directly as the type of
921 any function parameter.
923 These are still rejected *semantically*, so you will likely receive an error
924 but these changes can be seen and parsed by procedural macros and
925 conditional compilation.
929 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
930 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
931 - [`Option::{expect,unwrap}` and
932 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
933 pointing to the location where they were called, rather than
934 `core`'s internals. ][67887]
936 \* Refer to Rust's [platform support page][forge-platform-support] for more
937 information on Rust's tiered platform support.
941 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
942 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
943 to implement `Sized`.][67935]
944 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
945 - [`Layout::new` is now `const`.][66254]
946 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
951 - [`CondVar::wait_while`]
952 - [`CondVar::wait_timeout_while`]
954 - [`DebugMap::value`]
955 - [`ManuallyDrop::take`]
957 - [`ptr::slice_from_raw_parts_mut`]
958 - [`ptr::slice_from_raw_parts`]
962 - [You no longer need to include `extern crate proc_macro;` to be able to
963 `use proc_macro;` in the `2018` edition.][cargo/7700]
967 - [`Error::description` has been deprecated, and its use will now produce a
968 warning.][66919] It's recommended to use `Display`/`to_string` instead.
970 [68253]: https://github.com/rust-lang/rust/pull/68253/
971 [68348]: https://github.com/rust-lang/rust/pull/68348/
972 [67935]: https://github.com/rust-lang/rust/pull/67935/
973 [68339]: https://github.com/rust-lang/rust/pull/68339/
974 [68122]: https://github.com/rust-lang/rust/pull/68122/
975 [67712]: https://github.com/rust-lang/rust/pull/67712/
976 [67887]: https://github.com/rust-lang/rust/pull/67887/
977 [67131]: https://github.com/rust-lang/rust/pull/67131/
978 [67233]: https://github.com/rust-lang/rust/pull/67233/
979 [66899]: https://github.com/rust-lang/rust/pull/66899/
980 [66919]: https://github.com/rust-lang/rust/pull/66919/
981 [66254]: https://github.com/rust-lang/rust/pull/66254/
982 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
983 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
984 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
985 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
986 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
987 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
988 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
989 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
990 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
993 Version 1.41.1 (2020-02-27)
994 ===========================
996 * [Always check types of static items][69145]
997 * [Always check lifetime bounds of `Copy` impls][69145]
998 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1000 [69225]: https://github.com/rust-lang/rust/issues/69225
1001 [69145]: https://github.com/rust-lang/rust/pull/69145
1004 Version 1.41.0 (2020-01-30)
1005 ===========================
1010 - [You can now pass type parameters to foreign items when implementing
1011 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1012 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1013 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1014 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1015 - [You can now use any valid identifier in a `format_args` macro.][66847]
1016 Previously identifiers starting with an underscore were not allowed.
1017 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1018 enum variants.][66183] These are still rejected semantically, but
1019 can be seen and parsed by procedural macros and conditional compilation.
1024 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1025 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1026 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1027 - [You can now pass an arguments file passing the `@path` syntax
1028 to rustc.][66172] Note that the format differs somewhat from what is
1029 found in other tooling; please see [the documentation][argfile-docs] for
1031 - [You can now provide `--extern` flag without a path, indicating that it is
1032 available from the search path or specified with an `-L` flag.][64882]
1034 \* Refer to Rust's [platform support page][forge-platform-support] for more
1035 information on Rust's tiered platform support.
1037 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1042 - [The `core::panic` module is now stable.][66771] It was already stable
1044 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1045 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1046 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1051 - [`Result::map_or`]
1052 - [`Result::map_or_else`]
1053 - [`std::rc::Weak::weak_count`]
1054 - [`std::rc::Weak::strong_count`]
1055 - [`std::sync::Weak::weak_count`]
1056 - [`std::sync::Weak::strong_count`]
1061 - [Cargo will now document all the private items for binary crates
1062 by default.][cargo/7593]
1063 - [`cargo-install` will now reinstall the package if it detects that it is out
1064 of date.][cargo/7560]
1065 - [Cargo.lock now uses a more git friendly format that should help to reduce
1066 merge conflicts.][cargo/7579]
1067 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1068 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1069 optimisation level to `2` for debug builds. You can also use
1070 `[profile.<profile>.build-override]` to override build scripts and
1076 - [You can now specify `edition` in documentation code blocks to compile the block
1077 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1078 should be compiled the 2018 edition of Rust.
1079 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1080 current theme with `--check-theme`.][54733]
1081 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1086 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1087 Apple targets.][apple-32bit-drop] This means that the source code is still
1088 available to build, but the targets are no longer being tested and release
1089 binaries for those platforms will no longer be distributed by the Rust project.
1090 Please refer to the linked blog post for more information.
1092 [54733]: https://github.com/rust-lang/rust/pull/54733/
1093 [61351]: https://github.com/rust-lang/rust/pull/61351/
1094 [67255]: https://github.com/rust-lang/rust/pull/67255/
1095 [66661]: https://github.com/rust-lang/rust/pull/66661/
1096 [66771]: https://github.com/rust-lang/rust/pull/66771/
1097 [66847]: https://github.com/rust-lang/rust/pull/66847/
1098 [66238]: https://github.com/rust-lang/rust/pull/66238/
1099 [66277]: https://github.com/rust-lang/rust/pull/66277/
1100 [66325]: https://github.com/rust-lang/rust/pull/66325/
1101 [66172]: https://github.com/rust-lang/rust/pull/66172/
1102 [66183]: https://github.com/rust-lang/rust/pull/66183/
1103 [65879]: https://github.com/rust-lang/rust/pull/65879/
1104 [65013]: https://github.com/rust-lang/rust/pull/65013/
1105 [64882]: https://github.com/rust-lang/rust/pull/64882/
1106 [64325]: https://github.com/rust-lang/rust/pull/64325/
1107 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1108 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1109 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1110 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1111 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1112 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1113 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1114 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1115 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1116 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1117 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1119 Version 1.40.0 (2019-12-19)
1120 ===========================
1124 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1125 `const` contexts.][65188] e.g.
1128 pub struct Point(i32, i32);
1130 const ORIGIN: Point = {
1131 let constructor = Point;
1137 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1138 indicate that there may be variants or fields added in the future.][64639]
1139 For example this requires adding a wild-card branch (`_ => {}`) to any match
1140 statements on a non-exhaustive `enum`. [(RFC 2008)]
1141 - [You can now use function-like procedural macros in `extern` blocks and in
1142 type positions.][63931] e.g. `type Generated = macro!();`
1143 - [Function-like and attribute procedural macros can now emit
1144 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1145 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1146 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1147 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1151 - [Added tier 3 support\* for the
1152 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1153 - [Added tier 3 support for the
1154 `aarch64-unknown-none-softfloat` target.][64589]
1155 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1156 `mips64el-unknown-linux-muslabi64` targets.][65843]
1158 \* Refer to Rust's [platform support page][forge-platform-support] for more
1159 information on Rust's tiered platform support.
1163 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1167 - [`BTreeMap::get_key_value`]
1168 - [`HashMap::get_key_value`]
1169 - [`Option::as_deref_mut`]
1170 - [`Option::as_deref`]
1171 - [`Option::flatten`]
1172 - [`UdpSocket::peer_addr`]
1173 - [`f32::to_be_bytes`]
1174 - [`f32::to_le_bytes`]
1175 - [`f32::to_ne_bytes`]
1176 - [`f64::to_be_bytes`]
1177 - [`f64::to_le_bytes`]
1178 - [`f64::to_ne_bytes`]
1179 - [`f32::from_be_bytes`]
1180 - [`f32::from_le_bytes`]
1181 - [`f32::from_ne_bytes`]
1182 - [`f64::from_be_bytes`]
1183 - [`f64::from_le_bytes`]
1184 - [`f64::from_ne_bytes`]
1191 - [Cargo will now always display warnings, rather than only on
1192 fresh builds.][cargo/7450]
1193 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1194 now produce an error.][cargo/7507] Previously these flags were ignored.
1195 - [You can now publish `dev-dependencies` without including
1196 a `version`.][cargo/7333]
1200 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1201 when running documentation tests with `rustdoc`.][63803]
1205 - [As previously announced, any previous NLL warnings in the 2015 edition are
1206 now hard errors.][64221]
1207 - [The `include!` macro will now warn if it failed to include the
1208 entire file.][64284] The `include!` macro unintentionally only includes the
1209 first _expression_ in a file, and this can be unintuitive. This will become
1210 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1211 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1212 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1213 or `extern` blocks now correctly emits a hard error.
1215 [65294]: https://github.com/rust-lang/rust/pull/65294/
1216 [66103]: https://github.com/rust-lang/rust/pull/66103/
1217 [65843]: https://github.com/rust-lang/rust/pull/65843/
1218 [65188]: https://github.com/rust-lang/rust/pull/65188/
1219 [65092]: https://github.com/rust-lang/rust/pull/65092/
1220 [64589]: https://github.com/rust-lang/rust/pull/64589/
1221 [64639]: https://github.com/rust-lang/rust/pull/64639/
1222 [64221]: https://github.com/rust-lang/rust/pull/64221/
1223 [64284]: https://github.com/rust-lang/rust/pull/64284/
1224 [63931]: https://github.com/rust-lang/rust/pull/63931/
1225 [64035]: https://github.com/rust-lang/rust/pull/64035/
1226 [63674]: https://github.com/rust-lang/rust/pull/63674/
1227 [63803]: https://github.com/rust-lang/rust/pull/63803/
1228 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1229 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1230 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1231 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1232 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1233 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1234 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1235 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1236 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1237 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1238 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1239 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1240 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1241 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1242 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1243 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1244 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1245 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1246 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1247 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1248 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1249 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1250 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1251 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1252 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1253 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1256 Version 1.39.0 (2019-11-07)
1257 ===========================
1261 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1262 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1263 - [You can now use certain attributes on function, closure, and function pointer
1264 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1265 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1266 attributes applied to items. e.g.
1269 #[cfg(windows)] slice: &[u16],
1270 #[cfg(not(windows))] slice: &[u8],
1275 - [You can now take shared references to bind-by-move patterns in the `if` guards
1276 of `match` arms.][63118] e.g.
1279 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1283 // ---- `nums` is bound by move.
1284 if nums.iter().sum::<u8>() == 10
1285 // ^------ `.iter()` implicitly takes a reference to `nums`.
1288 // ----------- Legal as `nums` was bound by move and so we have ownership.
1290 _ => unreachable!(),
1299 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1300 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1301 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1302 **Note** Cargo currently doesn't use this feature. Refer to
1303 [cargo#7315][cargo/7315] to track this feature's progress.
1304 - [You can now pass `--show-output` argument to test binaries to print the
1305 output of successful tests.][62600]
1308 \* Refer to Rust's [platform support page][forge-platform-support] for more
1309 information on Rust's tiered platform support.
1313 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1314 - [`LinkedList::new` is now a `const` function.][63684]
1315 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1316 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1317 now `const`.][63786]
1321 - [`Pin::into_inner`]
1322 - [`Instant::checked_duration_since`]
1323 - [`Instant::saturating_duration_since`]
1327 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1328 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1329 `--all` is now deprecated.
1333 - [You can now pass `-Clinker` to rustdoc to control the linker used
1334 for compiling doctests.][63834]
1338 - [Code that was previously accepted by the old borrow checker, but rejected by
1339 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1340 previously a warning, and will also become a hard error in the Rust 2015
1341 edition in the 1.40.0 release.
1342 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1343 run tests.][63827] This should improve performance when running a large
1345 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1346 recommended to use the `?` operator instead.
1347 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1350 [62600]: https://github.com/rust-lang/rust/pull/62600/
1351 [62672]: https://github.com/rust-lang/rust/pull/62672/
1352 [63118]: https://github.com/rust-lang/rust/pull/63118/
1353 [63209]: https://github.com/rust-lang/rust/pull/63209/
1354 [63402]: https://github.com/rust-lang/rust/pull/63402/
1355 [63565]: https://github.com/rust-lang/rust/pull/63565/
1356 [63595]: https://github.com/rust-lang/rust/pull/63595/
1357 [63684]: https://github.com/rust-lang/rust/pull/63684/
1358 [63698]: https://github.com/rust-lang/rust/pull/63698/
1359 [63770]: https://github.com/rust-lang/rust/pull/63770/
1360 [63786]: https://github.com/rust-lang/rust/pull/63786/
1361 [63827]: https://github.com/rust-lang/rust/pull/63827/
1362 [63834]: https://github.com/rust-lang/rust/pull/63834/
1363 [63927]: https://github.com/rust-lang/rust/pull/63927/
1364 [63933]: https://github.com/rust-lang/rust/pull/63933/
1365 [63934]: https://github.com/rust-lang/rust/pull/63934/
1366 [63938]: https://github.com/rust-lang/rust/pull/63938/
1367 [63940]: https://github.com/rust-lang/rust/pull/63940/
1368 [63941]: https://github.com/rust-lang/rust/pull/63941/
1369 [63945]: https://github.com/rust-lang/rust/pull/63945/
1370 [64010]: https://github.com/rust-lang/rust/pull/64010/
1371 [64028]: https://github.com/rust-lang/rust/pull/64028/
1372 [64334]: https://github.com/rust-lang/rust/pull/64334/
1373 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1374 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1375 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1376 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1377 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1378 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1380 Version 1.38.0 (2019-09-26)
1381 ==========================
1385 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1386 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1390 - [Added pipelined compilation support to `rustc`.][62766] This will
1391 improve compilation times in some cases. For further information please refer
1392 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1393 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1394 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1395 `x86_64-uwp-windows-msvc` targets.][60260]
1396 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1397 `armv7-unknown-linux-musleabi` targets.][63107]
1398 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1399 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1400 - [Upgraded to LLVM 9.][62592]
1402 \* Refer to Rust's [platform support page][forge-platform-support] for more
1403 information on Rust's tiered platform support.
1407 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1408 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1409 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1410 is available at `std::clone::Clone`). This also makes all built-in macros
1411 available in `std`/`core` root. e.g. `std::include_bytes!`.
1412 - [`str::Chars` now implements `Debug`.][63000]
1413 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1414 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1415 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1416 - [Added euclidean remainder and division operations (`div_euclid`,
1417 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1418 `overflowing`, and `wrapping` versions are available for all
1420 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1421 `PartialEq`.][61491]
1422 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1426 - [`<*const T>::cast`]
1427 - [`<*mut T>::cast`]
1428 - [`Duration::as_secs_f32`]
1429 - [`Duration::as_secs_f64`]
1430 - [`Duration::div_f32`]
1431 - [`Duration::div_f64`]
1432 - [`Duration::from_secs_f32`]
1433 - [`Duration::from_secs_f64`]
1434 - [`Duration::mul_f32`]
1435 - [`Duration::mul_f64`]
1436 - [`any::type_name`]
1440 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1441 - [You can now pass the `--features` option multiple times to enable
1442 multiple features.][cargo/7084]
1446 - [`rustc` will now warn about some incorrect uses of
1447 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1451 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1453 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1454 issues][62896] with certain crates such as libc.
1456 [60260]: https://github.com/rust-lang/rust/pull/60260/
1457 [61457]: https://github.com/rust-lang/rust/pull/61457/
1458 [61491]: https://github.com/rust-lang/rust/pull/61491/
1459 [61884]: https://github.com/rust-lang/rust/pull/61884/
1460 [61953]: https://github.com/rust-lang/rust/pull/61953/
1461 [62042]: https://github.com/rust-lang/rust/pull/62042/
1462 [62528]: https://github.com/rust-lang/rust/pull/62528/
1463 [62583]: https://github.com/rust-lang/rust/pull/62583/
1464 [62735]: https://github.com/rust-lang/rust/pull/62735/
1465 [62766]: https://github.com/rust-lang/rust/pull/62766/
1466 [62784]: https://github.com/rust-lang/rust/pull/62784/
1467 [62592]: https://github.com/rust-lang/rust/pull/62592/
1468 [62785]: https://github.com/rust-lang/rust/issues/62785/
1469 [62814]: https://github.com/rust-lang/rust/pull/62814/
1470 [62896]: https://github.com/rust-lang/rust/issues/62896/
1471 [63000]: https://github.com/rust-lang/rust/pull/63000/
1472 [63056]: https://github.com/rust-lang/rust/pull/63056/
1473 [63107]: https://github.com/rust-lang/rust/pull/63107/
1474 [63346]: https://github.com/rust-lang/rust/pull/63346/
1475 [63421]: https://github.com/rust-lang/rust/pull/63421/
1476 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1477 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1478 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1479 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1480 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1481 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1482 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1483 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1484 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1485 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1486 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1487 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1488 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1489 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1490 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1492 Version 1.37.0 (2019-08-15)
1493 ==========================
1497 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1498 [`Box`][62228], or an [array][62235] and unused.
1499 - [You can now use the `cfg` and `cfg_attr` attributes on
1500 generic parameters.][61547]
1501 - [You can now use enum variants through type alias.][61682] e.g. You can
1502 write the following:
1504 type MyOption = Option<u8>;
1506 fn increment_or_zero(x: MyOption) -> u8 {
1508 MyOption::Some(y) => y + 1,
1509 MyOption::None => 0,
1513 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1514 `const _: u32 = 5;`.
1515 - [You can now use `#[repr(align(X)]` on enums.][61229]
1516 - [The `?` Kleene macro operator is now available in the
1517 2015 edition.][60932]
1521 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1522 and `-C profile-use` flags.][61268] For more information on how to use profile
1523 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1524 - [The `rust-lldb` wrapper script should now work again.][61827]
1528 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1532 - [`BufReader::buffer`]
1533 - [`BufWriter::buffer`]
1534 - [`Cell::from_mut`]
1535 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1536 - [`DoubleEndedIterator::nth_back`]
1538 - [`Wrapping::reverse_bits`]
1539 - [`i128::reverse_bits`]
1540 - [`i16::reverse_bits`]
1541 - [`i32::reverse_bits`]
1542 - [`i64::reverse_bits`]
1543 - [`i8::reverse_bits`]
1544 - [`isize::reverse_bits`]
1545 - [`slice::copy_within`]
1546 - [`u128::reverse_bits`]
1547 - [`u16::reverse_bits`]
1548 - [`u32::reverse_bits`]
1549 - [`u64::reverse_bits`]
1550 - [`u8::reverse_bits`]
1551 - [`usize::reverse_bits`]
1555 - [`Cargo.lock` files are now included by default when publishing executable crates
1556 with executables.][cargo/7026]
1557 - [You can now specify `default-run="foo"` in `[package]` to specify the
1558 default executable to use for `cargo run`.][cargo/7056]
1565 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1566 Please transition your code to using the `..=` syntax for inclusive
1568 - [Using a trait object without the `dyn` will now warn by default.][61203]
1569 Please transition your code to use `dyn Trait` for trait objects instead.
1571 [62228]: https://github.com/rust-lang/rust/pull/62228/
1572 [62235]: https://github.com/rust-lang/rust/pull/62235/
1573 [61802]: https://github.com/rust-lang/rust/pull/61802/
1574 [61827]: https://github.com/rust-lang/rust/pull/61827/
1575 [61547]: https://github.com/rust-lang/rust/pull/61547/
1576 [61682]: https://github.com/rust-lang/rust/pull/61682/
1577 [61268]: https://github.com/rust-lang/rust/pull/61268/
1578 [61342]: https://github.com/rust-lang/rust/pull/61342/
1579 [61347]: https://github.com/rust-lang/rust/pull/61347/
1580 [61100]: https://github.com/rust-lang/rust/pull/61100/
1581 [61203]: https://github.com/rust-lang/rust/pull/61203/
1582 [61229]: https://github.com/rust-lang/rust/pull/61229/
1583 [60932]: https://github.com/rust-lang/rust/pull/60932/
1584 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1585 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1586 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1587 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1588 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1589 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1590 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1591 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1592 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1593 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1594 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1595 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1596 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1597 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1598 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1599 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1600 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1601 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1602 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1603 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1604 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1605 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1606 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1607 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1610 Version 1.36.0 (2019-07-04)
1611 ==========================
1615 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1616 - [The order of traits in trait objects no longer affects the semantics of that
1617 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1618 `dyn fmt::Debug + Send`, where this was previously not the case.
1622 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1623 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1624 - [`mem::needs_drop` is now available as a const fn.][60364]
1625 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1626 - [`String` now implements `BorrowMut<str>`.][60404]
1627 - [`io::Cursor` now implements `Default`.][60234]
1628 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1629 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1630 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1631 environment has access to heap memory allocation.
1632 - [`String` now implements `From<&String>`.][59825]
1633 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1634 return a tuple of each argument when there is multiple arguments.
1635 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1640 - [`VecDeque::rotate_left`]
1641 - [`VecDeque::rotate_right`]
1642 - [`Iterator::copied`]
1644 - [`io::IoSliceMut`]
1645 - [`Read::read_vectored`]
1646 - [`Write::write_vectored`]
1647 - [`str::as_mut_ptr`]
1648 - [`mem::MaybeUninit`]
1649 - [`pointer::align_offset`]
1650 - [`future::Future`]
1652 - [`task::RawWaker`]
1653 - [`task::RawWakerVTable`]
1659 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1660 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1662 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1666 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1673 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1674 longer recommended, and will be deprecated in 1.39.0.
1676 [60318]: https://github.com/rust-lang/rust/pull/60318/
1677 [60364]: https://github.com/rust-lang/rust/pull/60364/
1678 [60370]: https://github.com/rust-lang/rust/pull/60370/
1679 [60404]: https://github.com/rust-lang/rust/pull/60404/
1680 [60234]: https://github.com/rust-lang/rust/pull/60234/
1681 [60244]: https://github.com/rust-lang/rust/pull/60244/
1682 [58623]: https://github.com/rust-lang/rust/pull/58623/
1683 [59648]: https://github.com/rust-lang/rust/pull/59648/
1684 [59675]: https://github.com/rust-lang/rust/pull/59675/
1685 [59825]: https://github.com/rust-lang/rust/pull/59825/
1686 [59826]: https://github.com/rust-lang/rust/pull/59826/
1687 [59445]: https://github.com/rust-lang/rust/pull/59445/
1688 [59114]: https://github.com/rust-lang/rust/pull/59114/
1689 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1690 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1691 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1692 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1693 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1694 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1695 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1696 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1697 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1698 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1699 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1700 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1701 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1702 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1703 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1704 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1705 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1706 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1707 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1708 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1711 Version 1.35.0 (2019-05-23)
1712 ==========================
1716 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1717 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1718 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1720 unsafe fn call_unsafe(func: unsafe fn()) {
1725 unsafe { call_unsafe(|| {}); }
1732 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1733 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1734 - [Added the `wasm32-unknown-wasi` target.][59464]
1739 - [`Thread` will now show its ID in `Debug` output.][59460]
1740 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1741 - [`alloc::System` now implements `Default`.][59451]
1742 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1744 - [`char::{ToLowercase, ToUppercase}` now
1745 implement `ExactSizeIterator`.][58778]
1746 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1747 - [Removed the `Read` trait bounds
1748 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1749 - [You can now call the `dbg!` macro without any parameters to print the file
1750 and line where it is called.][57847]
1751 - [In place ASCII case conversions are now up to 4× faster.][59283]
1752 e.g. `str::make_ascii_lowercase`
1753 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1760 - [`RefCell::replace_with`]
1761 - [`RefCell::map_split`]
1763 - [`Range::contains`]
1764 - [`RangeFrom::contains`]
1765 - [`RangeTo::contains`]
1766 - [`RangeInclusive::contains`]
1767 - [`RangeToInclusive::contains`]
1768 - [`Option::copied`]
1772 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1773 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1778 - [The Rust toolchain is now available natively for musl based distros.][58575]
1780 [59460]: https://github.com/rust-lang/rust/pull/59460/
1781 [59464]: https://github.com/rust-lang/rust/pull/59464/
1782 [59500]: https://github.com/rust-lang/rust/pull/59500/
1783 [59512]: https://github.com/rust-lang/rust/pull/59512/
1784 [59580]: https://github.com/rust-lang/rust/pull/59580/
1785 [59283]: https://github.com/rust-lang/rust/pull/59283/
1786 [59451]: https://github.com/rust-lang/rust/pull/59451/
1787 [59076]: https://github.com/rust-lang/rust/pull/59076/
1788 [58778]: https://github.com/rust-lang/rust/pull/58778/
1789 [58717]: https://github.com/rust-lang/rust/pull/58717/
1790 [58369]: https://github.com/rust-lang/rust/pull/58369/
1791 [58423]: https://github.com/rust-lang/rust/pull/58423/
1792 [58080]: https://github.com/rust-lang/rust/pull/58080/
1793 [57847]: https://github.com/rust-lang/rust/pull/57847/
1794 [58575]: https://github.com/rust-lang/rust/pull/58575
1795 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1796 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1797 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1798 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1799 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1800 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1801 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1802 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1803 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1804 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1805 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1806 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1808 Version 1.34.2 (2019-05-14)
1809 ===========================
1811 * [Destabilize the `Error::type_id` function due to a security
1812 vulnerability][60785] ([CVE-2019-12083])
1814 [60785]: https://github.com/rust-lang/rust/pull/60785
1815 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1817 Version 1.34.1 (2019-04-25)
1818 ===========================
1820 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1821 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1822 * [Fix Clippy panic when checking some macros][clippy/3805]
1824 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1825 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1826 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1828 Version 1.34.0 (2019-04-11)
1829 ==========================
1833 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1834 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1836 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1837 `#[attr{}]` procedural macros.][57367]
1838 - [You can now write `extern crate self as foo;`][57407] to import your
1839 crate's root into the extern prelude.
1844 - [You can now target `riscv64imac-unknown-none-elf` and
1845 `riscv64gc-unknown-none-elf`.][58406]
1846 - [You can now enable linker plugin LTO optimisations with
1847 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1848 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1850 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1855 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1856 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1857 the `Hash` trait to create an iterator.
1858 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1859 methods.][58421] Most notably you no longer require the `Ord` trait to create
1861 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1862 for all numeric types.][58044]
1863 - [Indexing a `str` is now generic over all types that
1864 implement `SliceIndex<str>`.][57604]
1865 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1866 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1867 produce a warning if their returning type is unused.
1868 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1869 `overflowing_pow` are now available for all numeric types.][57873] These are
1870 equivalent to methods such as `wrapping_add` for the `pow` operation.
1878 * [`Error::type_id`]
1879 * [`atomic::AtomicI16`]
1880 * [`atomic::AtomicI32`]
1881 * [`atomic::AtomicI64`]
1882 * [`atomic::AtomicI8`]
1883 * [`atomic::AtomicU16`]
1884 * [`atomic::AtomicU32`]
1885 * [`atomic::AtomicU64`]
1886 * [`atomic::AtomicU8`]
1887 * [`convert::Infallible`]
1888 * [`convert::TryFrom`]
1889 * [`convert::TryInto`]
1891 * [`iter::successors`]
1892 * [`num::NonZeroI128`]
1893 * [`num::NonZeroI16`]
1894 * [`num::NonZeroI32`]
1895 * [`num::NonZeroI64`]
1896 * [`num::NonZeroI8`]
1897 * [`num::NonZeroIsize`]
1898 * [`slice::sort_by_cached_key`]
1899 * [`str::escape_debug`]
1900 * [`str::escape_default`]
1901 * [`str::escape_unicode`]
1902 * [`str::split_ascii_whitespace`]
1905 * [`Instant::checked_add`]
1906 * [`Instant::checked_sub`]
1907 * [`SystemTime::checked_add`]
1908 * [`SystemTime::checked_sub`]
1912 - [You can now use alternative registries to crates.io.][cargo/6654]
1916 - [You can now use the `?` operator in your documentation tests without manually
1917 adding `fn main() -> Result<(), _> {}`.][56470]
1921 - [`Command::before_exec` is being replaced by the unsafe method
1922 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1923 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1924 can now use `const` functions in `static` variables.
1926 [58370]: https://github.com/rust-lang/rust/pull/58370/
1927 [58406]: https://github.com/rust-lang/rust/pull/58406/
1928 [58421]: https://github.com/rust-lang/rust/pull/58421/
1929 [58166]: https://github.com/rust-lang/rust/pull/58166/
1930 [58044]: https://github.com/rust-lang/rust/pull/58044/
1931 [58057]: https://github.com/rust-lang/rust/pull/58057/
1932 [58059]: https://github.com/rust-lang/rust/pull/58059/
1933 [57809]: https://github.com/rust-lang/rust/pull/57809/
1934 [57873]: https://github.com/rust-lang/rust/pull/57873/
1935 [57604]: https://github.com/rust-lang/rust/pull/57604/
1936 [57367]: https://github.com/rust-lang/rust/pull/57367/
1937 [57407]: https://github.com/rust-lang/rust/pull/57407/
1938 [57425]: https://github.com/rust-lang/rust/pull/57425/
1939 [57106]: https://github.com/rust-lang/rust/pull/57106/
1940 [56470]: https://github.com/rust-lang/rust/pull/56470/
1941 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1942 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1943 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1944 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1945 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1946 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1947 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1948 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1949 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1950 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1951 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1952 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1953 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1954 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1955 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1956 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1957 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1958 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1959 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1960 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1961 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1962 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1963 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1964 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1965 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1966 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1967 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1968 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1969 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1970 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1971 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1974 Version 1.33.0 (2019-02-28)
1975 ==========================
1979 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1980 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1981 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1982 E.g. You can have match statement on a `u8` that covers `0..=255` and
1983 you would no longer be required to have a `_ => unreachable!()` case.
1984 - [You can now have multiple patterns in `if let` and `while let`
1985 expressions.][57532] You can do this with the same syntax as a `match`
1995 let state = Creature::Crab("Ferris");
1997 if let Creature::Crab(name) | Creature::Person(name) = state {
1998 println!("This creature's name is: {}", name);
2002 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2003 this feature will by default produce a warning as this behaviour can be
2004 unintuitive. E.g. `if let _ = 5 {}`
2005 - [You can now use `let` bindings, assignments, expression statements,
2006 and irrefutable pattern destructuring in const functions.][57175]
2007 - [You can now call unsafe const functions.][57067] E.g.
2009 const unsafe fn foo() -> i32 { 5 }
2010 const fn bar() -> i32 {
2014 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2015 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2016 - [You can now specify a specific alignment with the `#[repr(packed)]`
2017 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2018 with an alignment of 2 bytes and a size of 6 bytes.
2019 - [You can now import an item from a module as an `_`.][56303] This allows you to
2020 import a trait's impls, and not have the name in the namespace. E.g.
2022 use std::io::Read as _;
2024 // Allowed as there is only one `Read` in the module.
2027 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2031 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2032 command line argument.][56351]
2033 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2034 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2035 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2036 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2037 information on Rust's platform support.
2038 - [Added support for the `thumbv7neon-linux-androideabi` and
2039 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2040 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2044 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2045 functions for all numeric types.][57566]
2046 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2047 are now `const` functions for all numeric types.][57105]
2048 - [The methods `is_positive` and `is_negative` are now `const` functions for
2049 all signed numeric types.][57105]
2050 - [The `get` method for all `NonZero` types is now `const`.][57167]
2051 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2052 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2053 numeric types.][57234]
2054 - [`Ipv4Addr::new` is now a `const` function][57234]
2058 - [`unix::FileExt::read_exact_at`]
2059 - [`unix::FileExt::write_all_at`]
2060 - [`Option::transpose`]
2061 - [`Result::transpose`]
2062 - [`convert::identity`]
2065 - [`marker::PhantomPinned`]
2066 - [`Vec::resize_with`]
2067 - [`VecDeque::resize_with`]
2068 - [`Duration::as_millis`]
2069 - [`Duration::as_micros`]
2070 - [`Duration::as_nanos`]
2075 - [You can now publish crates that require a feature flag to compile with
2076 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2077 - [Cargo should now rebuild a crate if a file was modified during the initial
2082 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2083 are now deprecated in the standard library, and their usage will now produce a warning.
2084 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2086 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2088 - [Libtest no longer creates a new thread for each test when
2089 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2091 [55982]: https://github.com/rust-lang/rust/pull/55982/
2092 [56243]: https://github.com/rust-lang/rust/pull/56243
2093 [56303]: https://github.com/rust-lang/rust/pull/56303/
2094 [56351]: https://github.com/rust-lang/rust/pull/56351/
2095 [56362]: https://github.com/rust-lang/rust/pull/56362
2096 [56642]: https://github.com/rust-lang/rust/pull/56642/
2097 [56769]: https://github.com/rust-lang/rust/pull/56769/
2098 [56805]: https://github.com/rust-lang/rust/pull/56805
2099 [56947]: https://github.com/rust-lang/rust/pull/56947/
2100 [57049]: https://github.com/rust-lang/rust/pull/57049/
2101 [57067]: https://github.com/rust-lang/rust/pull/57067/
2102 [57105]: https://github.com/rust-lang/rust/pull/57105
2103 [57130]: https://github.com/rust-lang/rust/pull/57130/
2104 [57167]: https://github.com/rust-lang/rust/pull/57167/
2105 [57175]: https://github.com/rust-lang/rust/pull/57175/
2106 [57234]: https://github.com/rust-lang/rust/pull/57234/
2107 [57332]: https://github.com/rust-lang/rust/pull/57332/
2108 [57465]: https://github.com/rust-lang/rust/pull/57465/
2109 [57532]: https://github.com/rust-lang/rust/pull/57532/
2110 [57535]: https://github.com/rust-lang/rust/pull/57535/
2111 [57566]: https://github.com/rust-lang/rust/pull/57566/
2112 [57615]: https://github.com/rust-lang/rust/pull/57615/
2113 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2114 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2115 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2116 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2117 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2118 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2119 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2120 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2121 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2122 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2123 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2124 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2125 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2126 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2127 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2128 [platform-support]: https://forge.rust-lang.org/platform-support.html
2130 Version 1.32.0 (2019-01-17)
2131 ==========================
2136 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2137 operator allows you to specify zero or one repetitions similar to the `*` and
2139 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2140 now always resolve to the item (`enum`, `struct`, etc.) available in the
2141 module if present, before resolving to a external crate or an item the prelude.][56759]
2144 enum Color { Red, Green, Blue }
2150 - [You can now match against `PhantomData<T>` types.][55837]
2151 - [You can now match against literals in macros with the `literal`
2152 specifier.][56072] This will match against a literal of any type.
2153 E.g. `1`, `'A'`, `"Hello World"`
2154 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2156 struct Point(i32, i32);
2159 pub fn new(x: i32, y: i32) -> Self {
2163 pub fn is_origin(&self) -> bool {
2171 - [Self can also now be used in type definitions.][56366] E.g.
2175 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2178 Cons(T, Box<Self>) // likewise here
2181 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2182 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2186 - [The default allocator has changed from jemalloc to the default allocator on
2187 your system.][55238] The compiler itself on Linux & macOS will still use
2188 jemalloc, but programs compiled with it will use the system allocator.
2189 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2193 - [`PathBuf` now implements `FromStr`.][55148]
2194 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2195 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2196 easily debug expressions in your rust program. E.g.
2199 let b = dbg!(a * 2) + 1;
2200 // ^-- prints: [src/main.rs:4] a * 2 = 4
2204 The following APIs are now `const` functions and can be used in a
2208 - [`UnsafeCell::get`]
2209 - [`char::is_ascii`]
2211 - [`ManuallyDrop::new`]
2212 - [`ManuallyDrop::into_inner`]
2213 - [`RangeInclusive::start`]
2214 - [`RangeInclusive::end`]
2215 - [`NonNull::as_ptr`]
2218 - [`Duration::as_secs`]
2219 - [`Duration::subsec_millis`]
2220 - [`Duration::subsec_micros`]
2221 - [`Duration::subsec_nanos`]
2223 - [`Ipv4Addr::is_unspecified`]
2225 - [`Ipv6Addr::octets`]
2229 - [`i8::to_be_bytes`]
2230 - [`i8::to_le_bytes`]
2231 - [`i8::to_ne_bytes`]
2232 - [`i8::from_be_bytes`]
2233 - [`i8::from_le_bytes`]
2234 - [`i8::from_ne_bytes`]
2235 - [`i16::to_be_bytes`]
2236 - [`i16::to_le_bytes`]
2237 - [`i16::to_ne_bytes`]
2238 - [`i16::from_be_bytes`]
2239 - [`i16::from_le_bytes`]
2240 - [`i16::from_ne_bytes`]
2241 - [`i32::to_be_bytes`]
2242 - [`i32::to_le_bytes`]
2243 - [`i32::to_ne_bytes`]
2244 - [`i32::from_be_bytes`]
2245 - [`i32::from_le_bytes`]
2246 - [`i32::from_ne_bytes`]
2247 - [`i64::to_be_bytes`]
2248 - [`i64::to_le_bytes`]
2249 - [`i64::to_ne_bytes`]
2250 - [`i64::from_be_bytes`]
2251 - [`i64::from_le_bytes`]
2252 - [`i64::from_ne_bytes`]
2253 - [`i128::to_be_bytes`]
2254 - [`i128::to_le_bytes`]
2255 - [`i128::to_ne_bytes`]
2256 - [`i128::from_be_bytes`]
2257 - [`i128::from_le_bytes`]
2258 - [`i128::from_ne_bytes`]
2259 - [`isize::to_be_bytes`]
2260 - [`isize::to_le_bytes`]
2261 - [`isize::to_ne_bytes`]
2262 - [`isize::from_be_bytes`]
2263 - [`isize::from_le_bytes`]
2264 - [`isize::from_ne_bytes`]
2265 - [`u8::to_be_bytes`]
2266 - [`u8::to_le_bytes`]
2267 - [`u8::to_ne_bytes`]
2268 - [`u8::from_be_bytes`]
2269 - [`u8::from_le_bytes`]
2270 - [`u8::from_ne_bytes`]
2271 - [`u16::to_be_bytes`]
2272 - [`u16::to_le_bytes`]
2273 - [`u16::to_ne_bytes`]
2274 - [`u16::from_be_bytes`]
2275 - [`u16::from_le_bytes`]
2276 - [`u16::from_ne_bytes`]
2277 - [`u32::to_be_bytes`]
2278 - [`u32::to_le_bytes`]
2279 - [`u32::to_ne_bytes`]
2280 - [`u32::from_be_bytes`]
2281 - [`u32::from_le_bytes`]
2282 - [`u32::from_ne_bytes`]
2283 - [`u64::to_be_bytes`]
2284 - [`u64::to_le_bytes`]
2285 - [`u64::to_ne_bytes`]
2286 - [`u64::from_be_bytes`]
2287 - [`u64::from_le_bytes`]
2288 - [`u64::from_ne_bytes`]
2289 - [`u128::to_be_bytes`]
2290 - [`u128::to_le_bytes`]
2291 - [`u128::to_ne_bytes`]
2292 - [`u128::from_be_bytes`]
2293 - [`u128::from_le_bytes`]
2294 - [`u128::from_ne_bytes`]
2295 - [`usize::to_be_bytes`]
2296 - [`usize::to_le_bytes`]
2297 - [`usize::to_ne_bytes`]
2298 - [`usize::from_be_bytes`]
2299 - [`usize::from_le_bytes`]
2300 - [`usize::from_ne_bytes`]
2304 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2305 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2309 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2313 - [The argument types for AVX's
2314 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2315 been changed from `*const` to `*mut` as the previous implementation
2319 [55148]: https://github.com/rust-lang/rust/pull/55148/
2320 [55238]: https://github.com/rust-lang/rust/pull/55238/
2321 [55280]: https://github.com/rust-lang/rust/pull/55280/
2322 [55610]: https://github.com/rust-lang/rust/pull/55610/
2323 [55663]: https://github.com/rust-lang/rust/pull/55663/
2324 [55702]: https://github.com/rust-lang/rust/pull/55702/
2325 [55837]: https://github.com/rust-lang/rust/pull/55837/
2326 [55843]: https://github.com/rust-lang/rust/pull/55843/
2327 [56072]: https://github.com/rust-lang/rust/pull/56072/
2328 [56245]: https://github.com/rust-lang/rust/pull/56245/
2329 [56365]: https://github.com/rust-lang/rust/pull/56365/
2330 [56366]: https://github.com/rust-lang/rust/pull/56366/
2331 [56395]: https://github.com/rust-lang/rust/pull/56395/
2332 [56759]: https://github.com/rust-lang/rust/pull/56759/
2333 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2334 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2335 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2336 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2337 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2338 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2339 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2340 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2341 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2342 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2343 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2344 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2345 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2346 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2347 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2348 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2349 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2350 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2351 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2352 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2353 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2354 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2355 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2356 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2357 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2358 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2359 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2360 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2361 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2362 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2363 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2364 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2365 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2366 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2367 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2368 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2369 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2370 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2371 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2372 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2373 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2374 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2375 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2376 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2377 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2378 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2379 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2380 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2381 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2382 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2383 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2384 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2385 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2386 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2387 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2388 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2389 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2390 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2391 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2392 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2393 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2394 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2395 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2396 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2397 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2398 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2399 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2400 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2401 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2402 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2403 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2404 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2405 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2406 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2407 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2408 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2409 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2410 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2411 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2412 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2413 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2414 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2415 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2416 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2417 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2418 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2419 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2420 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2421 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2422 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2423 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2424 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2425 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2428 Version 1.31.1 (2018-12-20)
2429 ===========================
2431 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2432 - [Fix broken go-to-definition in RLS][rls/1171]
2433 - [Fix infinite loop on hover in RLS][rls/1170]
2435 [56562]: https://github.com/rust-lang/rust/pull/56562
2436 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2437 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2439 Version 1.31.0 (2018-12-06)
2440 ==========================
2444 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2445 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2446 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2447 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2449 - [You can now define and use `const` functions.][54835] These are currently
2450 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2451 [language reference][const-reference] for what exactly is available.
2452 - [You can now use tool lints, which allow you to scope lints from external
2453 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2454 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2455 a crate, not just in exported functions.][54451]
2456 - [You can now use parentheses in pattern matches.][54497]
2460 - [Updated musl to 1.1.20][54430]
2464 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2465 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2466 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2467 into `Option<&mut T>` using the `From` trait.][53218]
2468 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2473 - [`slice::align_to`]
2474 - [`slice::align_to_mut`]
2475 - [`slice::chunks_exact`]
2476 - [`slice::chunks_exact_mut`]
2477 - [`slice::rchunks`]
2478 - [`slice::rchunks_mut`]
2479 - [`slice::rchunks_exact`]
2480 - [`slice::rchunks_exact_mut`]
2481 - [`Option::replace`]
2485 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2486 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2487 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2489 [52813]: https://github.com/rust-lang/rust/pull/52813/
2490 [53218]: https://github.com/rust-lang/rust/pull/53218/
2491 [53555]: https://github.com/rust-lang/rust/issues/53555/
2492 [54057]: https://github.com/rust-lang/rust/pull/54057/
2493 [54240]: https://github.com/rust-lang/rust/pull/54240/
2494 [54430]: https://github.com/rust-lang/rust/pull/54430/
2495 [54451]: https://github.com/rust-lang/rust/pull/54451/
2496 [54497]: https://github.com/rust-lang/rust/pull/54497/
2497 [54778]: https://github.com/rust-lang/rust/pull/54778/
2498 [54835]: https://github.com/rust-lang/rust/pull/54835/
2499 [54870]: https://github.com/rust-lang/rust/pull/54870/
2500 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2501 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2502 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2503 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2504 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2505 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2506 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2507 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2508 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2509 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2510 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2511 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2512 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2513 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2515 Version 1.30.1 (2018-11-08)
2516 ===========================
2518 - [Fixed overflow ICE in rustdoc][54199]
2519 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2521 [54199]: https://github.com/rust-lang/rust/pull/54199
2522 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2524 Version 1.30.0 (2018-10-25)
2525 ==========================
2529 - [Procedural macros are now available.][52081] These kinds of macros allow for
2530 more powerful code generation. There is a [new chapter available][proc-macros]
2531 in the Rust Programming Language book that goes further in depth.
2532 - [You can now use keywords as identifiers using the raw identifiers
2533 syntax (`r#`),][53236] e.g. `let r#for = true;`
2534 - [Using anonymous parameters in traits is now deprecated with a warning and
2535 will be a hard error in the 2018 edition.][53272]
2536 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2537 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2538 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2539 Previously, using a external crate in a module without a use statement
2540 required `let json = ::serde_json::from_str(foo);` but can now be written
2541 as `let json = serde_json::from_str(foo);`.
2542 - [You can now apply the `#[used]` attribute to static items to prevent the
2543 compiler from optimising them away, even if they appear to be unused,][51363]
2544 e.g. `#[used] static FOO: u32 = 1;`
2545 - [You can now import and reexport macros from other crates with the `use`
2546 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2547 the root module of the crate. If your macro relies on calling other local
2548 macros, it is recommended to export with the
2549 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2551 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2552 using the `vis` specifier.][53370]
2553 - [Non-macro attributes now allow all forms of literals, not just
2554 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2555 write `#[attr(true)]`.
2556 - [You can now specify a function to handle a panic in the Rust runtime with the
2557 `#[panic_handler]` attribute.][51366]
2561 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2562 - [Added the `aarch64-unknown-netbsd` target][53165]
2563 - [Upgraded to LLVM 8.][53611]
2567 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2571 - [`Ipv4Addr::BROADCAST`]
2572 - [`Ipv4Addr::LOCALHOST`]
2573 - [`Ipv4Addr::UNSPECIFIED`]
2574 - [`Ipv6Addr::LOCALHOST`]
2575 - [`Ipv6Addr::UNSPECIFIED`]
2576 - [`Iterator::find_map`]
2578 The following methods are replacement methods for `trim_left`, `trim_right`,
2579 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2581 - [`str::trim_end_matches`]
2583 - [`str::trim_start_matches`]
2584 - [`str::trim_start`]
2588 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2589 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2590 equivalent to calling `rustdoc --error-format=json`.
2591 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2595 - [`rustdoc` allows you to specify what edition to treat your code as with the
2596 `--edition` option.][54057]
2597 - [`rustdoc` now has the `--color` (specify whether to output color) and
2598 `--error-format` (specify error format, e.g. `json`) options.][53003]
2599 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2600 debug symbols.][53774]
2601 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2602 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2604 [50911]: https://github.com/rust-lang/rust/pull/50911/
2605 [51363]: https://github.com/rust-lang/rust/pull/51363/
2606 [51366]: https://github.com/rust-lang/rust/pull/51366/
2607 [52081]: https://github.com/rust-lang/rust/pull/52081/
2608 [53003]: https://github.com/rust-lang/rust/pull/53003/
2609 [53033]: https://github.com/rust-lang/rust/pull/53033/
2610 [53044]: https://github.com/rust-lang/rust/pull/53044/
2611 [53165]: https://github.com/rust-lang/rust/pull/53165/
2612 [53611]: https://github.com/rust-lang/rust/pull/53611/
2613 [53213]: https://github.com/rust-lang/rust/pull/53213/
2614 [53236]: https://github.com/rust-lang/rust/pull/53236/
2615 [53272]: https://github.com/rust-lang/rust/pull/53272/
2616 [53370]: https://github.com/rust-lang/rust/pull/53370/
2617 [53459]: https://github.com/rust-lang/rust/pull/53459/
2618 [53774]: https://github.com/rust-lang/rust/pull/53774/
2619 [53822]: https://github.com/rust-lang/rust/pull/53822/
2620 [54057]: https://github.com/rust-lang/rust/pull/54057/
2621 [54146]: https://github.com/rust-lang/rust/pull/54146/
2622 [54404]: https://github.com/rust-lang/rust/pull/54404/
2623 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2624 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2625 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2626 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2628 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2629 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2630 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2631 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2632 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2633 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2634 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2635 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2636 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2637 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2640 Version 1.29.2 (2018-10-11)
2641 ===========================
2643 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2644 - The `rls-preview` component on the windows-gnu targets has been restored.
2646 [54639]: https://github.com/rust-lang/rust/pull/54639
2649 Version 1.29.1 (2018-09-25)
2650 ===========================
2655 - The standard library's `str::repeat` function contained an out of bounds write
2656 caused by an integer overflow. This has been fixed by deterministically
2657 panicking when an overflow happens.
2659 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2663 Version 1.29.0 (2018-09-13)
2664 ==========================
2668 - [Bumped minimum LLVM version to 5.0.][51899]
2669 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2670 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2671 - [Upgraded to LLVM 7.][51966]
2675 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2676 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2677 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2678 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2680 - [`Cell<T>` now allows `T` to be unsized.][50494]
2681 - [`SocketAddr` is now stable on Redox.][52656]
2686 - [`Iterator::flatten`]
2691 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2692 `--locked` to disable this behavior.
2693 - [`cargo-install` will now allow you to cross compile an install
2694 using `--target`.][cargo/5614]
2695 - [Added the `cargo-fix` subcommand to automatically move project code from
2696 2015 edition to 2018.][cargo/5723]
2697 - [`cargo doc` can now optionally document private types using the
2698 `--document-private-items` flag.][cargo/5543]
2702 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2703 the specified level to that level.][52354] For example `--cap-lints warn`
2704 will demote `deny` and `forbid` lints to `warn`.
2705 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2706 fails and `101` if there is a panic.][52197]
2707 - [A preview of clippy has been made available through rustup.][51122]
2708 You can install the preview with `rustup component add clippy-preview`.
2712 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2713 Use `str::get_unchecked(begin..end)` instead.
2714 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2715 Consider using the `home_dir` function from
2716 https://crates.io/crates/dirs instead.
2717 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2718 - [`cfg` attributes and `--cfg` command line flags are now more
2719 strictly validated.][53893]
2721 [53893]: https://github.com/rust-lang/rust/pull/53893/
2722 [52861]: https://github.com/rust-lang/rust/pull/52861/
2723 [51966]: https://github.com/rust-lang/rust/pull/51966/
2724 [52656]: https://github.com/rust-lang/rust/pull/52656/
2725 [52239]: https://github.com/rust-lang/rust/pull/52239/
2726 [52330]: https://github.com/rust-lang/rust/pull/52330/
2727 [52354]: https://github.com/rust-lang/rust/pull/52354/
2728 [52402]: https://github.com/rust-lang/rust/pull/52402/
2729 [52103]: https://github.com/rust-lang/rust/pull/52103/
2730 [52197]: https://github.com/rust-lang/rust/pull/52197/
2731 [51807]: https://github.com/rust-lang/rust/pull/51807/
2732 [51899]: https://github.com/rust-lang/rust/pull/51899/
2733 [51912]: https://github.com/rust-lang/rust/pull/51912/
2734 [51511]: https://github.com/rust-lang/rust/pull/51511/
2735 [51619]: https://github.com/rust-lang/rust/pull/51619/
2736 [51656]: https://github.com/rust-lang/rust/pull/51656/
2737 [51178]: https://github.com/rust-lang/rust/pull/51178/
2738 [51122]: https://github.com/rust-lang/rust/pull/51122
2739 [50494]: https://github.com/rust-lang/rust/pull/50494/
2740 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2741 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2742 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2743 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2744 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2745 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2746 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2749 Version 1.28.0 (2018-08-02)
2750 ===========================
2754 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2755 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2756 the inner type across Foreign Function Interface (FFI) boundaries.
2757 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2758 and can now be used as identifiers.][51196]
2759 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2760 stable.][51241] This will allow users to specify a global allocator for
2762 - [Unit test functions marked with the `#[test]` attribute can now return
2763 `Result<(), E: Debug>` in addition to `()`.][51298]
2764 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2765 allows macros to easily target lifetimes.
2769 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2770 prioritise making smaller binary sizes. `z` is the same as `s` with the
2771 exception that it does not vectorise loops, which typically results in an even
2773 - [The short error format is now stable.][49546] Specified with
2774 `--error-format=short` this option will provide a more compressed output of
2775 rust error messages.
2776 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2777 - [Reduced the number of allocations in the macro parser.][50855] This can
2778 improve compile times of macro heavy crates on average by 5%.
2782 - [Implemented `Default` for `&mut str`.][51306]
2783 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2784 - [Implemented `Extend` for `()`.][50234]
2785 - [The `Debug` implementation of `time::Duration` should now be more easily
2786 human readable.][50364] Previously a `Duration` of one second would printed as
2787 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2788 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2789 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2790 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2791 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2792 for `PathBuf`.][50170]
2793 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2794 and `Wrapping<i128>`.][50465]
2795 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2796 possible.][51050] This can provide up to a 40% speed increase.
2797 - [Improved error messages when using `format!`.][50610]
2801 - [`Iterator::step_by`]
2802 - [`Path::ancestors`]
2803 - [`SystemTime::UNIX_EPOCH`]
2804 - [`alloc::GlobalAlloc`]
2806 - [`alloc::LayoutErr`]
2809 - [`alloc::alloc_zeroed`]
2810 - [`alloc::dealloc`]
2811 - [`alloc::realloc`]
2812 - [`alloc::handle_alloc_error`]
2813 - [`btree_map::Entry::or_default`]
2814 - [`fmt::Alignment`]
2815 - [`hash_map::Entry::or_default`]
2816 - [`iter::repeat_with`]
2817 - [`num::NonZeroUsize`]
2818 - [`num::NonZeroU128`]
2819 - [`num::NonZeroU16`]
2820 - [`num::NonZeroU32`]
2821 - [`num::NonZeroU64`]
2822 - [`num::NonZeroU8`]
2823 - [`ops::RangeBounds`]
2824 - [`slice::SliceIndex`]
2825 - [`slice::from_mut`]
2826 - [`slice::from_ref`]
2827 - [`{Any + Send + Sync}::downcast_mut`]
2828 - [`{Any + Send + Sync}::downcast_ref`]
2829 - [`{Any + Send + Sync}::is`]
2833 - [Cargo will now no longer allow you to publish crates with build scripts that
2834 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2835 considered to be immutable.
2839 - [The `suggestion_applicability` field in `rustc`'s json output is now
2840 stable.][50486] This will allow dev tools to check whether a code suggestion
2841 would apply to them.
2845 - [Rust will consider trait objects with duplicated constraints to be the same
2846 type as without the duplicated constraint.][51276] For example the below code will
2847 now fail to compile.
2852 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2855 impl Trait + Send + Send {
2856 fn test(&self) { println!("two"); }
2860 [49546]: https://github.com/rust-lang/rust/pull/49546/
2861 [50143]: https://github.com/rust-lang/rust/pull/50143/
2862 [50170]: https://github.com/rust-lang/rust/pull/50170/
2863 [50234]: https://github.com/rust-lang/rust/pull/50234/
2864 [50265]: https://github.com/rust-lang/rust/pull/50265/
2865 [50364]: https://github.com/rust-lang/rust/pull/50364/
2866 [50385]: https://github.com/rust-lang/rust/pull/50385/
2867 [50465]: https://github.com/rust-lang/rust/pull/50465/
2868 [50486]: https://github.com/rust-lang/rust/pull/50486/
2869 [50554]: https://github.com/rust-lang/rust/pull/50554/
2870 [50610]: https://github.com/rust-lang/rust/pull/50610/
2871 [50855]: https://github.com/rust-lang/rust/pull/50855/
2872 [51050]: https://github.com/rust-lang/rust/pull/51050/
2873 [51196]: https://github.com/rust-lang/rust/pull/51196/
2874 [51200]: https://github.com/rust-lang/rust/pull/51200/
2875 [51241]: https://github.com/rust-lang/rust/pull/51241/
2876 [51276]: https://github.com/rust-lang/rust/pull/51276/
2877 [51298]: https://github.com/rust-lang/rust/pull/51298/
2878 [51306]: https://github.com/rust-lang/rust/pull/51306/
2879 [51562]: https://github.com/rust-lang/rust/pull/51562/
2880 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2881 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2882 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2883 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2884 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2885 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2886 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2887 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2888 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2889 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2890 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2891 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2892 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2893 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2894 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2895 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2896 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2897 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2898 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2899 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2900 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2901 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2902 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2903 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2904 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2905 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2906 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2907 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2908 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2909 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2911 Version 1.27.2 (2018-07-20)
2912 ===========================
2917 - The borrow checker was fixed to avoid potential unsoundness when using
2918 match ergonomics: [#52213][52213].
2920 [52213]: https://github.com/rust-lang/rust/issues/52213
2922 Version 1.27.1 (2018-07-10)
2923 ===========================
2928 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2929 when running, which enabled executing code as some other user on a
2930 given machine. This release fixes that vulnerability; you can read
2931 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2933 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2938 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2939 match ergonomics: [#51415][51415], [#49534][49534].
2941 [51415]: https://github.com/rust-lang/rust/issues/51415
2942 [49534]: https://github.com/rust-lang/rust/issues/49534
2943 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2944 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2946 Version 1.27.0 (2018-06-21)
2947 ==========================
2951 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2952 be used as an identifier.
2953 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2954 bare `Trait` syntax, and should make it clearer when being used in tandem with
2955 `impl Trait` because it is equivalent to the following syntax:
2956 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2957 `Box<Trait> == Box<dyn Trait>`.
2958 - [Attributes on generic parameters such as types and lifetimes are
2959 now stable.][48851] e.g.
2960 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2961 - [The `#[must_use]` attribute can now also be used on functions as well as
2962 types.][48925] It provides a lint that by default warns users when the
2963 value returned by a function has not been used.
2967 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2971 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2972 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2973 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2974 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2975 the `cfg` attribute.
2976 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2977 std are now available in core.][49896]
2978 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2980 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2981 that the operation isn't done in place.
2982 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2983 the `#[must_use]` attribute][49533] to warn about unused potentially
2984 expensive allocations.
2988 - [`DoubleEndedIterator::rfind`]
2989 - [`DoubleEndedIterator::rfold`]
2990 - [`DoubleEndedIterator::try_rfold`]
2991 - [`Duration::from_micros`]
2992 - [`Duration::from_nanos`]
2993 - [`Duration::subsec_micros`]
2994 - [`Duration::subsec_millis`]
2995 - [`HashMap::remove_entry`]
2996 - [`Iterator::try_fold`]
2997 - [`Iterator::try_for_each`]
2999 - [`Option::filter`]
3000 - [`String::replace_range`]
3001 - [`Take::set_limit`]
3002 - [`hint::unreachable_unchecked`]
3003 - [`os::unix::process::parent_id`]
3004 - [`ptr::swap_nonoverlapping`]
3005 - [`slice::rsplit_mut`]
3007 - [`slice::swap_with_slice`]
3011 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3012 `readme`, and `repository` fields.][cargo/5386]
3013 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3014 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3015 a different directory than `target` for placing compilation artifacts.
3016 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3017 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3018 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3019 where cargo would infer a binary, Cargo will produce a warning. You can
3020 disable this feature ahead of time by setting any of the following to false:
3021 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3022 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3023 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3027 - [Added “The Rustc book” into the official documentation.][49707]
3028 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3029 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3033 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3034 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3035 compile, `"".is_empty()` will still compile.
3036 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3037 will only print the inner type.][48553] E.g.
3038 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3039 not `AtomicBool(true)`.
3040 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3041 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3042 alignment should cover all use cases.
3043 - The `.description()` method on the `std::error::Error` trait
3044 [has been soft-deprecated][50163]. It is no longer required to implement it.
3046 [48553]: https://github.com/rust-lang/rust/pull/48553/
3047 [48851]: https://github.com/rust-lang/rust/pull/48851/
3048 [48925]: https://github.com/rust-lang/rust/pull/48925/
3049 [49533]: https://github.com/rust-lang/rust/pull/49533/
3050 [49623]: https://github.com/rust-lang/rust/pull/49623/
3051 [49630]: https://github.com/rust-lang/rust/pull/49630/
3052 [49664]: https://github.com/rust-lang/rust/pull/49664/
3053 [49699]: https://github.com/rust-lang/rust/pull/49699/
3054 [49707]: https://github.com/rust-lang/rust/pull/49707/
3055 [49719]: https://github.com/rust-lang/rust/pull/49719/
3056 [49896]: https://github.com/rust-lang/rust/pull/49896/
3057 [49968]: https://github.com/rust-lang/rust/pull/49968/
3058 [50163]: https://github.com/rust-lang/rust/pull/50163
3059 [50177]: https://github.com/rust-lang/rust/pull/50177/
3060 [50378]: https://github.com/rust-lang/rust/pull/50378/
3061 [50398]: https://github.com/rust-lang/rust/pull/50398/
3062 [50423]: https://github.com/rust-lang/rust/pull/50423/
3063 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3064 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3065 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3066 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3067 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3068 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3069 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3070 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3071 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3072 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3073 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3074 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3075 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3076 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3077 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3078 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3079 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3080 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3081 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3082 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3083 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3084 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3085 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3086 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3087 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3088 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3089 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3090 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3091 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3092 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3095 Version 1.26.2 (2018-06-05)
3096 ==========================
3101 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3103 [51117]: https://github.com/rust-lang/rust/issues/51117
3106 Version 1.26.1 (2018-05-29)
3107 ==========================
3112 - [RLS now works on Windows.][50646]
3113 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3119 - [`fn main() -> impl Trait` no longer works for non-Termination
3121 This reverts an accidental stabilization.
3122 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3123 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3125 [50646]: https://github.com/rust-lang/rust/issues/50646
3126 [50656]: https://github.com/rust-lang/rust/pull/50656
3127 [50812]: https://github.com/rust-lang/rust/pull/50812
3128 [50950]: https://github.com/rust-lang/rust/issues/50950
3129 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3131 Version 1.26.0 (2018-05-10)
3132 ==========================
3136 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3137 implement either or both traits.][49299]
3138 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3139 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3140 lifetime can be elided.][49458]
3141 - [`impl Trait` is now stable allowing you to have abstract types in returns
3142 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3143 `fn open(path: impl AsRef<Path>)`.
3144 - [Pattern matching will now automatically apply dereferences.][49394]
3145 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3146 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3147 - [A lot of operations are now available in a const context.][46882] E.g. You
3148 can now index into constant arrays, reference and dereference into constants,
3149 and use tuple struct constructors.
3150 - [Fixed entry slice patterns are now stable.][48516] E.g.
3152 let points = [1, 2, 3, 4];
3154 [1, 2, 3, 4] => println!("All points were sequential."),
3155 _ => println!("Not all points were sequential."),
3162 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3163 - [Fixed exponential projection complexity on nested types.][48296]
3164 This can provide up to a ~12% reduction in compile times for certain crates.
3165 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3166 to remap path prefixes outputted by the compiler.
3167 - [Added `powerpc-unknown-netbsd` target.][48281]
3171 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3172 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3173 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3174 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3175 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3176 - [`ascii::escape_default` is now available in libcore.][48735]
3177 - [Trailing commas are now supported in std and core macros.][48056]
3178 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3179 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3184 - [`*const T::copy_to_nonoverlapping`]
3185 - [`*const T::copy_to`]
3186 - [`*const T::read_unaligned`]
3187 - [`*const T::read_volatile`]
3188 - [`*const T::read`]
3190 - [`*const T::wrapping_add`]
3191 - [`*const T::wrapping_sub`]
3193 - [`*mut T::copy_to_nonoverlapping`]
3194 - [`*mut T::copy_to`]
3195 - [`*mut T::read_unaligned`]
3196 - [`*mut T::read_volatile`]
3198 - [`*mut T::replace`]
3201 - [`*mut T::wrapping_add`]
3202 - [`*mut T::wrapping_sub`]
3203 - [`*mut T::write_bytes`]
3204 - [`*mut T::write_unaligned`]
3205 - [`*mut T::write_volatile`]
3208 - [`FromUtf8Error::as_bytes`]
3209 - [`LocalKey::try_with`]
3210 - [`Option::cloned`]
3211 - [`btree_map::Entry::and_modify`]
3212 - [`fs::read_to_string`]
3215 - [`hash_map::Entry::and_modify`]
3216 - [`iter::FusedIterator`]
3217 - [`ops::RangeInclusive`]
3218 - [`ops::RangeToInclusive`]
3220 - [`slice::rotate_left`]
3221 - [`slice::rotate_right`]
3222 - [`String::retain`]
3227 - [Cargo will now output path to custom commands when `-v` is
3228 passed with `--list`][cargo/5041]
3229 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3233 - [The second edition of "The Rust Programming Language" book is now recommended
3234 over the first.][48404]
3239 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3240 syntax is now invalid.
3242 use std::ops::Fn as dyn;
3243 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3245 - [The result of dereferences are no longer promoted to `'static`.][47408]
3249 const PAIR: &(i32, i32) = &(0, 1);
3250 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3253 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3254 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3256 - [Removed hoedown from rustdoc.][48274]
3257 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3259 [46882]: https://github.com/rust-lang/rust/pull/46882
3260 [47379]: https://github.com/rust-lang/rust/pull/47379
3261 [47408]: https://github.com/rust-lang/rust/pull/47408
3262 [47813]: https://github.com/rust-lang/rust/pull/47813
3263 [48056]: https://github.com/rust-lang/rust/pull/48056
3264 [48125]: https://github.com/rust-lang/rust/pull/48125
3265 [48166]: https://github.com/rust-lang/rust/pull/48166
3266 [48235]: https://github.com/rust-lang/rust/pull/48235
3267 [48274]: https://github.com/rust-lang/rust/pull/48274
3268 [48281]: https://github.com/rust-lang/rust/pull/48281
3269 [48296]: https://github.com/rust-lang/rust/pull/48296
3270 [48326]: https://github.com/rust-lang/rust/pull/48326
3271 [48359]: https://github.com/rust-lang/rust/pull/48359
3272 [48404]: https://github.com/rust-lang/rust/pull/48404
3273 [48481]: https://github.com/rust-lang/rust/pull/48481
3274 [48516]: https://github.com/rust-lang/rust/pull/48516
3275 [48628]: https://github.com/rust-lang/rust/pull/48628
3276 [48629]: https://github.com/rust-lang/rust/pull/48629
3277 [48657]: https://github.com/rust-lang/rust/pull/48657
3278 [48735]: https://github.com/rust-lang/rust/pull/48735
3279 [48978]: https://github.com/rust-lang/rust/pull/48978
3280 [49101]: https://github.com/rust-lang/rust/pull/49101
3281 [49109]: https://github.com/rust-lang/rust/pull/49109
3282 [49121]: https://github.com/rust-lang/rust/pull/49121
3283 [49162]: https://github.com/rust-lang/rust/pull/49162
3284 [49184]: https://github.com/rust-lang/rust/pull/49184
3285 [49234]: https://github.com/rust-lang/rust/pull/49234
3286 [49255]: https://github.com/rust-lang/rust/pull/49255
3287 [49299]: https://github.com/rust-lang/rust/pull/49299
3288 [49305]: https://github.com/rust-lang/rust/pull/49305
3289 [49394]: https://github.com/rust-lang/rust/pull/49394
3290 [49458]: https://github.com/rust-lang/rust/pull/49458
3291 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3292 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3293 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3294 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3295 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3296 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3297 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3298 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3299 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3300 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3301 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3302 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3303 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3304 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3305 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3306 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3307 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3308 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3309 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3310 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3311 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3312 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3313 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3314 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3315 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3316 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3317 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3318 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3319 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3320 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3321 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3322 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3323 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3324 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3325 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3326 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3327 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3328 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3329 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3330 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3331 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3332 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3335 Version 1.25.0 (2018-03-29)
3336 ==========================
3340 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3341 - [You can now use nested groups of imports.][47948]
3342 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3343 - [You can now have `|` at the start of a match arm.][47947] e.g.
3345 enum Foo { A, B, C }
3351 | Foo::B => println!("AB"),
3352 | Foo::C => println!("C"),
3359 - [Upgraded to LLVM 6.][47828]
3360 - [Added `-C lto=val` option.][47521]
3361 - [Added `i586-unknown-linux-musl` target][47282]
3365 - [Impl Send for `process::Command` on Unix.][47760]
3366 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3367 - [`UnsafeCell::into_inner` is now safe.][47204]
3368 - [Implement libstd for CloudABI.][47268]
3369 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3370 - [Implement `AsRef<Path>` for Component][46985]
3371 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3372 - [Moved `Duration` to libcore.][46666]
3376 - [`Location::column`]
3379 The following functions can now be used in a constant expression.
3380 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3381 - [`Duration::new`][47300]
3382 - [`Duration::from_secs`][47300]
3383 - [`Duration::from_millis`][47300]
3387 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3388 - [`cargo new` now defaults to creating a binary crate, instead of a
3389 library crate.][cargo/5029]
3393 - [Rust by example is now shipped with new releases][46196]
3397 - [Deprecated `net::lookup_host`.][47510]
3398 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3399 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3400 around indexing operations (see [#47349][47349]). This has been fixed (which also
3401 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3402 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3404 [33903]: https://github.com/rust-lang/rust/pull/33903
3405 [47947]: https://github.com/rust-lang/rust/pull/47947
3406 [47948]: https://github.com/rust-lang/rust/pull/47948
3407 [47760]: https://github.com/rust-lang/rust/pull/47760
3408 [47790]: https://github.com/rust-lang/rust/pull/47790
3409 [47828]: https://github.com/rust-lang/rust/pull/47828
3410 [47398]: https://github.com/rust-lang/rust/pull/47398
3411 [47510]: https://github.com/rust-lang/rust/pull/47510
3412 [47521]: https://github.com/rust-lang/rust/pull/47521
3413 [47204]: https://github.com/rust-lang/rust/pull/47204
3414 [47251]: https://github.com/rust-lang/rust/pull/47251
3415 [47268]: https://github.com/rust-lang/rust/pull/47268
3416 [47282]: https://github.com/rust-lang/rust/pull/47282
3417 [47300]: https://github.com/rust-lang/rust/pull/47300
3418 [47349]: https://github.com/rust-lang/rust/pull/47349
3419 [46931]: https://github.com/rust-lang/rust/pull/46931
3420 [46985]: https://github.com/rust-lang/rust/pull/46985
3421 [47006]: https://github.com/rust-lang/rust/pull/47006
3422 [46830]: https://github.com/rust-lang/rust/pull/46830
3423 [46095]: https://github.com/rust-lang/rust/pull/46095
3424 [46666]: https://github.com/rust-lang/rust/pull/46666
3425 [46196]: https://github.com/rust-lang/rust/pull/46196
3426 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3427 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3428 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3429 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3430 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3433 Version 1.24.1 (2018-03-01)
3434 ==========================
3436 - [Do not abort when unwinding through FFI][48251]
3437 - [Emit UTF-16 files for linker arguments on Windows][48318]
3438 - [Make the error index generator work again][48308]
3439 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3441 [48251]: https://github.com/rust-lang/rust/issues/48251
3442 [48308]: https://github.com/rust-lang/rust/issues/48308
3443 [48318]: https://github.com/rust-lang/rust/issues/48318
3444 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3447 Version 1.24.0 (2018-02-15)
3448 ==========================
3452 - [External `sysv64` ffi is now available.][46528]
3453 eg. `extern "sysv64" fn foo () {}`
3457 - [rustc now uses 16 codegen units by default for release builds.][46910]
3458 For the fastest builds, utilize `codegen-units=1`.
3459 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3460 - [Add `aarch64-unknown-openbsd` support][46760]
3464 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3465 improvement in performance in the majority of cases.
3466 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3467 with Windows.][46798]
3468 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3469 - [impl `From<bool>` for `AtomicBool`][46293]
3470 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3471 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3472 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3473 - [float::from_bits now just uses transmute.][46012] This provides
3474 some optimisations from LLVM.
3475 - [Copied `AsciiExt` methods onto `char`][46077]
3476 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3477 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3478 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3479 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3483 - [`RefCell::replace`]
3485 - [`atomic::spin_loop_hint`]
3487 The following functions can now be used in a constant expression.
3488 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3490 - [`AtomicBool::new`][46287]
3491 - [`AtomicUsize::new`][46287]
3492 - [`AtomicIsize::new`][46287]
3493 - [`AtomicPtr::new`][46287]
3494 - [`Cell::new`][46287]
3495 - [`{integer}::min_value`][46287]
3496 - [`{integer}::max_value`][46287]
3497 - [`mem::size_of`][46287]
3498 - [`mem::align_of`][46287]
3499 - [`ptr::null`][46287]
3500 - [`ptr::null_mut`][46287]
3501 - [`RefCell::new`][46287]
3502 - [`UnsafeCell::new`][46287]
3506 - [Added a `workspace.default-members` config that
3507 overrides implied `--all` in virtual workspaces.][cargo/4743]
3508 - [Enable incremental by default on development builds.][cargo/4817] Also added
3509 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3510 per-project or global basis respectively.
3517 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3518 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3519 in accordance with IETF RFC 4291 §2.2.
3520 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3521 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3522 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3523 - [Leading zeros in tuple struct members is now an error][47084]
3524 - [`column!()` macro is one-based instead of zero-based][46977]
3525 - [`fmt::Arguments` can no longer be shared across threads][45198]
3526 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3527 - [Cargo sets a different working directory for the compiler][cargo/4788]
3529 [44884]: https://github.com/rust-lang/rust/pull/44884
3530 [45198]: https://github.com/rust-lang/rust/pull/45198
3531 [45506]: https://github.com/rust-lang/rust/pull/45506
3532 [45904]: https://github.com/rust-lang/rust/pull/45904
3533 [45990]: https://github.com/rust-lang/rust/pull/45990
3534 [46012]: https://github.com/rust-lang/rust/pull/46012
3535 [46077]: https://github.com/rust-lang/rust/pull/46077
3536 [46094]: https://github.com/rust-lang/rust/pull/46094
3537 [46284]: https://github.com/rust-lang/rust/pull/46284
3538 [46287]: https://github.com/rust-lang/rust/pull/46287
3539 [46293]: https://github.com/rust-lang/rust/pull/46293
3540 [46528]: https://github.com/rust-lang/rust/pull/46528
3541 [46671]: https://github.com/rust-lang/rust/pull/46671
3542 [46713]: https://github.com/rust-lang/rust/pull/46713
3543 [46735]: https://github.com/rust-lang/rust/pull/46735
3544 [46749]: https://github.com/rust-lang/rust/pull/46749
3545 [46760]: https://github.com/rust-lang/rust/pull/46760
3546 [46798]: https://github.com/rust-lang/rust/pull/46798
3547 [46828]: https://github.com/rust-lang/rust/pull/46828
3548 [46831]: https://github.com/rust-lang/rust/pull/46831
3549 [46833]: https://github.com/rust-lang/rust/pull/46833
3550 [46910]: https://github.com/rust-lang/rust/pull/46910
3551 [46977]: https://github.com/rust-lang/rust/pull/46977
3552 [47018]: https://github.com/rust-lang/rust/pull/47018
3553 [47080]: https://github.com/rust-lang/rust/pull/47080
3554 [47084]: https://github.com/rust-lang/rust/pull/47084
3555 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3556 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3557 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3558 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3559 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3560 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3563 Version 1.23.0 (2018-01-04)
3564 ==========================
3568 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3569 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3570 Which should fix some confusing errors in some operations.
3574 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3575 undefined behavior.][45920]
3576 - [rustc now suggests renaming import if names clash.][45660]
3577 - [Display errors/warnings correctly when there are zero-width or
3578 wide characters.][45711]
3579 - [rustc now avoids unnecessary copies of arguments that are
3580 simple bindings][45380] This should improve memory usage on average by 5-10%.
3581 - [Updated musl used to build musl rustc to 1.1.17][45393]
3585 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3586 - [Implement Hash for raw pointers to unsized types][45483]
3587 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3588 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3589 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3590 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3591 and `<*mut T>::as_mut`][44932]
3592 - [Optimized `Thread::{park, unpark}` implementation][45524]
3593 - [Improved `SliceExt::binary_search` performance.][45333]
3594 - [impl `FromIterator<()>` for `()`][45379]
3595 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3603 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3604 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3605 - [Added unit test checking to `cargo check`][cargo/4592]
3606 - [Cargo now lets you install a specific version
3607 using `cargo install --version`][cargo/4637]
3611 - [Releases now ship with the Cargo book documentation.][45692]
3612 - [rustdoc now prints rendering warnings on every run.][45324]
3616 - [Changes have been made to type equality to make it more correct,
3617 in rare cases this could break some code.][45853] [Tracking issue for
3618 further information][45852]
3619 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3620 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3621 Android 9, the minimum supported version is Android 14.
3622 - [Bumped the minimum LLVM to 3.9][45326]
3624 [44042]: https://github.com/rust-lang/rust/pull/44042
3625 [44932]: https://github.com/rust-lang/rust/pull/44932
3626 [45267]: https://github.com/rust-lang/rust/pull/45267
3627 [45324]: https://github.com/rust-lang/rust/pull/45324
3628 [45326]: https://github.com/rust-lang/rust/pull/45326
3629 [45333]: https://github.com/rust-lang/rust/pull/45333
3630 [45379]: https://github.com/rust-lang/rust/pull/45379
3631 [45380]: https://github.com/rust-lang/rust/pull/45380
3632 [45393]: https://github.com/rust-lang/rust/pull/45393
3633 [45435]: https://github.com/rust-lang/rust/pull/45435
3634 [45483]: https://github.com/rust-lang/rust/pull/45483
3635 [45524]: https://github.com/rust-lang/rust/pull/45524
3636 [45571]: https://github.com/rust-lang/rust/pull/45571
3637 [45580]: https://github.com/rust-lang/rust/pull/45580
3638 [45610]: https://github.com/rust-lang/rust/pull/45610
3639 [45660]: https://github.com/rust-lang/rust/pull/45660
3640 [45692]: https://github.com/rust-lang/rust/pull/45692
3641 [45711]: https://github.com/rust-lang/rust/pull/45711
3642 [45772]: https://github.com/rust-lang/rust/pull/45772
3643 [45852]: https://github.com/rust-lang/rust/issues/45852
3644 [45853]: https://github.com/rust-lang/rust/pull/45853
3645 [45887]: https://github.com/rust-lang/rust/pull/45887
3646 [45920]: https://github.com/rust-lang/rust/pull/45920
3647 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3648 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3649 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3652 Version 1.22.1 (2017-11-22)
3653 ==========================
3655 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3657 [46183]: https://github.com/rust-lang/rust/pull/46183
3659 Version 1.22.0 (2017-11-22)
3660 ==========================
3664 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3665 - [Now accepts underscores in unicode escapes][43716]
3666 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3667 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3671 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3672 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3673 This should decrease compile times for debug builds.
3674 - [strict memory alignment now enabled on ARMv6][45094]
3675 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3679 - [Allow atomic operations up to 32 bits
3680 on `armv5te_unknown_linux_gnueabi`][44978]
3681 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3682 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3683 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3684 - [Properly detect overflow in `Instant += Duration`.][44220]
3685 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3686 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3687 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3694 - [Cargo will now build multi file examples in subdirectories of the `examples`
3695 folder that have a `main.rs` file.][cargo/4496]
3696 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3697 the old format will continue to work and can be updated with `cargo update`.
3698 - [Now supports vendoring git repositories][cargo/3992]
3702 - [`libbacktrace` is now available on Apple platforms.][44251]
3703 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3704 This now lets you specify that a given code example will fail to compile.
3708 - [The minimum Android version that rustc can build for has been bumped
3709 to `4.0` from `2.3`][45656]
3710 - [Allowing `T op= &T` for numeric types has broken some type
3711 inference cases][45480]
3714 [42526]: https://github.com/rust-lang/rust/pull/42526
3715 [43017]: https://github.com/rust-lang/rust/pull/43017
3716 [43716]: https://github.com/rust-lang/rust/pull/43716
3717 [43949]: https://github.com/rust-lang/rust/pull/43949
3718 [44015]: https://github.com/rust-lang/rust/pull/44015
3719 [44220]: https://github.com/rust-lang/rust/pull/44220
3720 [44251]: https://github.com/rust-lang/rust/pull/44251
3721 [44287]: https://github.com/rust-lang/rust/pull/44287
3722 [44303]: https://github.com/rust-lang/rust/pull/44303
3723 [44456]: https://github.com/rust-lang/rust/pull/44456
3724 [44466]: https://github.com/rust-lang/rust/pull/44466
3725 [44895]: https://github.com/rust-lang/rust/pull/44895
3726 [44966]: https://github.com/rust-lang/rust/pull/44966
3727 [44978]: https://github.com/rust-lang/rust/pull/44978
3728 [45041]: https://github.com/rust-lang/rust/pull/45041
3729 [45064]: https://github.com/rust-lang/rust/pull/45064
3730 [45075]: https://github.com/rust-lang/rust/pull/45075
3731 [45094]: https://github.com/rust-lang/rust/pull/45094
3732 [45095]: https://github.com/rust-lang/rust/pull/45095
3733 [45480]: https://github.com/rust-lang/rust/issues/45480
3734 [45656]: https://github.com/rust-lang/rust/pull/45656
3735 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3736 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3737 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3744 Version 1.21.0 (2017-10-12)
3745 ==========================
3749 - [You can now use static references for literals.][43838]
3753 let x: &'static u32 = &0;
3756 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3759 my_macro!(Vec<i32>::new); // Always worked
3760 my_macro!(Vec::<i32>::new); // Now works
3765 - [Upgraded jemalloc to 4.5.0][43911]
3766 - [Enabled unwinding panics on Redox][43917]
3767 - [Now runs LLVM in parallel during translation phase.][43506]
3768 This should reduce peak memory usage.
3772 - [Generate builtin impls for `Clone` for all arrays and tuples that
3773 are `T: Clone`][43690]
3774 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3775 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3776 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3781 [`std::mem::discriminant`]
3785 - [You can now call `cargo install` with multiple package names][cargo/4216]
3786 - [Cargo commands inside a virtual workspace will now implicitly
3787 pass `--all`][cargo/4335]
3788 - [Added a `[patch]` section to `Cargo.toml` to handle
3789 prepublication dependencies][cargo/4123] [RFC 1969]
3790 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3791 like patterns][cargo/4270]
3792 - [Added the `--all-targets` option][cargo/4400]
3793 - [Using required dependencies as a feature is now deprecated and emits
3794 a warning][cargo/4364]
3799 - [Cargo docs are moving][43916]
3800 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3801 - [The rustdoc book is now available][43863]
3802 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3803 - [Added a preview of RLS has been made available through rustup][44204]
3804 Install with `rustup component add rls-preview`
3805 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3806 Previously only showed `std::os::unix`.
3810 - [Changes in method matching against higher-ranked types][43880] This may cause
3811 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3812 - [rustc's JSON error output's byte position start at top of file.][42973]
3813 Was previously relative to the rustc's internal `CodeMap` struct which
3814 required the unstable library `libsyntax` to correctly use.
3815 - [`unused_results` lint no longer ignores booleans][43728]
3817 [42565]: https://github.com/rust-lang/rust/pull/42565
3818 [42973]: https://github.com/rust-lang/rust/pull/42973
3819 [43348]: https://github.com/rust-lang/rust/pull/43348
3820 [43459]: https://github.com/rust-lang/rust/pull/43459
3821 [43506]: https://github.com/rust-lang/rust/pull/43506
3822 [43540]: https://github.com/rust-lang/rust/pull/43540
3823 [43690]: https://github.com/rust-lang/rust/pull/43690
3824 [43728]: https://github.com/rust-lang/rust/pull/43728
3825 [43838]: https://github.com/rust-lang/rust/pull/43838
3826 [43863]: https://github.com/rust-lang/rust/pull/43863
3827 [43880]: https://github.com/rust-lang/rust/pull/43880
3828 [43911]: https://github.com/rust-lang/rust/pull/43911
3829 [43916]: https://github.com/rust-lang/rust/pull/43916
3830 [43917]: https://github.com/rust-lang/rust/pull/43917
3831 [44204]: https://github.com/rust-lang/rust/pull/44204
3832 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3833 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3834 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3835 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3836 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3837 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3838 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3839 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3840 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3842 Version 1.20.0 (2017-08-31)
3843 ===========================
3847 - [Associated constants are now stabilised.][42809]
3848 - [A lot of macro bugs are now fixed.][42913]
3853 - [Struct fields are now properly coerced to the expected field type.][42807]
3854 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3855 `wasm32-experimental-emscripten` target.
3856 - [Changed some of the error messages to be more helpful.][42033]
3857 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3859 - [rustc now reports the total number of errors on compilation failure][43015]
3860 previously this was only the number of errors in the pass that failed.
3861 - [Expansion in rustc has been sped up 29x.][42533]
3862 - [added `msp430-none-elf` target.][43099]
3863 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3865 - [Fixes backtraces on Redox][43228]
3866 - [rustc now identifies different versions of same crate when absolute paths of
3867 different types match in an error message.][42826]
3873 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3874 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3876 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3877 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3878 - [Impl `Clone` for `DefaultHasher`.][42799]
3879 - [Impl `Sync` for `SyncSender`.][42397]
3880 - [Impl `FromStr` for `char`][42271]
3881 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3883 - [allow messages in the `unimplemented!()` macro.][42155]
3884 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3885 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3886 - [Upgrade to Unicode 10.0.0][42999]
3887 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3888 - [Skip the main thread's manual stack guard on Linux][43072]
3889 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3890 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3892 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3897 - [`CStr::into_c_string`]
3898 - [`CString::as_c_str`]
3899 - [`CString::into_boxed_c_str`]
3900 - [`Chain::get_mut`]
3901 - [`Chain::get_ref`]
3902 - [`Chain::into_inner`]
3903 - [`Option::get_or_insert_with`]
3904 - [`Option::get_or_insert`]
3905 - [`OsStr::into_os_string`]
3906 - [`OsString::into_boxed_os_str`]
3909 - [`Utf8Error::error_len`]
3910 - [`char::EscapeDebug`]
3911 - [`char::escape_debug`]
3912 - [`compile_error!`]
3913 - [`f32::from_bits`]
3915 - [`f64::from_bits`]
3917 - [`mem::ManuallyDrop`]
3918 - [`slice::sort_unstable_by_key`]
3919 - [`slice::sort_unstable_by`]
3920 - [`slice::sort_unstable`]
3921 - [`str::from_boxed_utf8_unchecked`]
3922 - [`str::as_bytes_mut`]
3923 - [`str::as_bytes_mut`]
3924 - [`str::from_utf8_mut`]
3925 - [`str::from_utf8_unchecked_mut`]
3927 - [`str::get_unchecked_mut`]
3928 - [`str::get_unchecked`]
3930 - [`str::into_boxed_bytes`]
3935 - [Cargo API token location moved from `~/.cargo/config` to
3936 `~/.cargo/credentials`.][cargo/3978]
3937 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3938 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3939 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3940 - [You can now specify version of a binary when installed through
3941 `cargo install` using `--vers`.][cargo/4229]
3942 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3943 failure.][cargo/4248]
3944 - [Changed the convention around which file is the crate root.][cargo/4259]
3945 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3946 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3951 - [Functions with `'static` in their return types will now not be as usable as
3952 if they were using lifetime parameters instead.][42417]
3953 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3954 takes the sign of NaN into account where previously didn't.][42430]
3956 [42033]: https://github.com/rust-lang/rust/pull/42033
3957 [42155]: https://github.com/rust-lang/rust/pull/42155
3958 [42271]: https://github.com/rust-lang/rust/pull/42271
3959 [42397]: https://github.com/rust-lang/rust/pull/42397
3960 [42417]: https://github.com/rust-lang/rust/pull/42417
3961 [42430]: https://github.com/rust-lang/rust/pull/42430
3962 [42431]: https://github.com/rust-lang/rust/pull/42431
3963 [42533]: https://github.com/rust-lang/rust/pull/42533
3964 [42571]: https://github.com/rust-lang/rust/pull/42571
3965 [42613]: https://github.com/rust-lang/rust/pull/42613
3966 [42799]: https://github.com/rust-lang/rust/pull/42799
3967 [42807]: https://github.com/rust-lang/rust/pull/42807
3968 [42809]: https://github.com/rust-lang/rust/pull/42809
3969 [42822]: https://github.com/rust-lang/rust/pull/42822
3970 [42826]: https://github.com/rust-lang/rust/pull/42826
3971 [42854]: https://github.com/rust-lang/rust/pull/42854
3972 [42913]: https://github.com/rust-lang/rust/pull/42913
3973 [42999]: https://github.com/rust-lang/rust/pull/42999
3974 [43011]: https://github.com/rust-lang/rust/pull/43011
3975 [43015]: https://github.com/rust-lang/rust/pull/43015
3976 [43072]: https://github.com/rust-lang/rust/pull/43072
3977 [43077]: https://github.com/rust-lang/rust/pull/43077
3978 [43097]: https://github.com/rust-lang/rust/pull/43097
3979 [43099]: https://github.com/rust-lang/rust/pull/43099
3980 [43170]: https://github.com/rust-lang/rust/pull/43170
3981 [43178]: https://github.com/rust-lang/rust/pull/43178
3982 [43185]: https://github.com/rust-lang/rust/pull/43185
3983 [43228]: https://github.com/rust-lang/rust/pull/43228
3984 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3985 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3986 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3987 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3988 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3989 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3990 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3991 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3992 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3993 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3994 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3995 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3996 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3997 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3998 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3999 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4000 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4001 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4002 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4003 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4004 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4005 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4006 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4007 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4008 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4009 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4010 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4011 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4012 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4013 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4014 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4015 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4016 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4017 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4018 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4019 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4020 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4021 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4022 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4025 Version 1.19.0 (2017-07-20)
4026 ===========================
4031 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4032 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4033 - [Macro recursion limit increased to 1024 from 64.][41676]
4034 - [Added lint for detecting unused macros.][41907]
4035 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4036 For example: `let x = loop { break 7; };`
4037 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4038 contain `Copy` types and cannot have a `Drop` implementation.
4039 Example: `union Foo { bar: u8, baz: usize }`
4040 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4041 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4046 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4047 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4048 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4049 you should use `--target armv7-linux-androideabi`.
4050 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4051 - [Minor optimisation of string operations.][42037]
4052 - [Compiler error message is now `aborting due to previous error(s)` instead of
4053 `aborting due to N previous errors`][42150] This was previously inaccurate and
4054 would only count certain kinds of errors.
4055 - [The compiler now supports Visual Studio 2017][42225]
4056 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4057 - [Added a lot][42264] of [new error codes][42302]
4058 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4059 libraries with C Run-time Libraries(CRT) to be statically linked.
4060 - [Fixed various ARM codegen bugs][42740]
4065 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4066 `Extend<Cow<'a, str>>`][41449]
4067 - [`Vec` now implements `From<&mut [T]>`][41530]
4068 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4069 - [`SplitWhitespace` now implements `Clone`][41659]
4070 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4072 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4073 macros, but for printing to stderr.
4078 - [`OsString::shrink_to_fit`]
4081 - [`thread::ThreadId`]
4086 - [Build scripts can now add environment variables to the environment
4087 the crate is being compiled in.
4088 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4089 - [Subcommands now replace the current process rather than spawning a new
4090 child process][cargo/3970]
4091 - [Workspace members can now accept glob file patterns][cargo/3979]
4092 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4093 the members in a given workspace.][cargo/3988]
4094 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4095 - [Target directory path is now in the cargo metadata][cargo/4022]
4096 - [Cargo no longer checks out a local working directory for the
4097 crates.io index][cargo/4026] This should provide smaller file size for the
4098 registry, and improve cloning times, especially on Windows machines.
4099 - [Added an `--exclude` option for excluding certain packages when using the
4100 `--all` option][cargo/4031]
4101 - [Cargo will now automatically retry when receiving a 5xx error
4102 from crates.io][cargo/4032]
4103 - [The `--features` option now accepts multiple comma or space
4104 delimited values.][cargo/4084]
4105 - [Added support for custom target specific runners][cargo/3954]
4110 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4112 - [Rust will now release XZ compressed packages][rust-installer/57]
4113 - [rustup will now prefer to download rust packages with
4114 XZ compression][rustup/1100] over GZip packages.
4115 - [Added the ability to escape `#` in rust documentation][41785] By adding
4116 additional `#`'s ie. `##` is now `#`
4121 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4122 - [`-Z` flags are now no longer allowed to be used on the stable
4123 compiler.][41751] This has been a warning for a year previous to this.
4124 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4125 longer works][42844]. Users should migrate to the built-in `check`
4126 command, which has been available since 1.16.
4127 - [Ending a float literal with `._` is now a hard error.
4128 Example: `42._` .][41946]
4129 - [Any use of a private `extern crate` outside of its module is now a
4130 hard error.][36886] This was previously a warning.
4131 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4132 relative while the `::` prefix makes a path absolute, but was ignored and the
4133 path was relative regardless.
4134 - [Floating point constants in match patterns is now a hard error][36890]
4135 This was previously a warning.
4136 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4137 match patterns is now a hard error][36891] This was previously a warning.
4138 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4140 - [From the pound escape, lines consisting of multiple `#`s are
4142 - [It is an error to re-export private enum variants][42460]. This is
4143 known to break a number of crates that depend on an older version of
4145 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4146 to use it to find the linker, and the build will fail where it did
4147 not previously][42607]
4149 [36886]: https://github.com/rust-lang/rust/issues/36886
4150 [36888]: https://github.com/rust-lang/rust/issues/36888
4151 [36890]: https://github.com/rust-lang/rust/issues/36890
4152 [36891]: https://github.com/rust-lang/rust/issues/36891
4153 [36892]: https://github.com/rust-lang/rust/issues/36892
4154 [37406]: https://github.com/rust-lang/rust/issues/37406
4155 [39983]: https://github.com/rust-lang/rust/pull/39983
4156 [41145]: https://github.com/rust-lang/rust/pull/41145
4157 [41192]: https://github.com/rust-lang/rust/pull/41192
4158 [41258]: https://github.com/rust-lang/rust/pull/41258
4159 [41370]: https://github.com/rust-lang/rust/pull/41370
4160 [41449]: https://github.com/rust-lang/rust/pull/41449
4161 [41530]: https://github.com/rust-lang/rust/pull/41530
4162 [41624]: https://github.com/rust-lang/rust/pull/41624
4163 [41656]: https://github.com/rust-lang/rust/pull/41656
4164 [41659]: https://github.com/rust-lang/rust/pull/41659
4165 [41676]: https://github.com/rust-lang/rust/pull/41676
4166 [41751]: https://github.com/rust-lang/rust/pull/41751
4167 [41764]: https://github.com/rust-lang/rust/pull/41764
4168 [41785]: https://github.com/rust-lang/rust/pull/41785
4169 [41873]: https://github.com/rust-lang/rust/pull/41873
4170 [41907]: https://github.com/rust-lang/rust/pull/41907
4171 [41946]: https://github.com/rust-lang/rust/pull/41946
4172 [42016]: https://github.com/rust-lang/rust/pull/42016
4173 [42037]: https://github.com/rust-lang/rust/pull/42037
4174 [42068]: https://github.com/rust-lang/rust/pull/42068
4175 [42150]: https://github.com/rust-lang/rust/pull/42150
4176 [42162]: https://github.com/rust-lang/rust/pull/42162
4177 [42225]: https://github.com/rust-lang/rust/pull/42225
4178 [42264]: https://github.com/rust-lang/rust/pull/42264
4179 [42302]: https://github.com/rust-lang/rust/pull/42302
4180 [42460]: https://github.com/rust-lang/rust/issues/42460
4181 [42607]: https://github.com/rust-lang/rust/issues/42607
4182 [42740]: https://github.com/rust-lang/rust/pull/42740
4183 [42844]: https://github.com/rust-lang/rust/issues/42844
4184 [42948]: https://github.com/rust-lang/rust/pull/42948
4185 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4186 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4187 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4188 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4189 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4190 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4191 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4192 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4193 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4194 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4195 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4196 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4197 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4198 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4199 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4200 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4201 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4202 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4203 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4204 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4205 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4206 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4209 Version 1.18.0 (2017-06-08)
4210 ===========================
4215 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4216 make the item visible to just that module tree. Also accepts the keyword
4217 `crate` to make something public to the whole crate but not users of the
4218 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4219 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4220 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4221 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4222 types like `Write + Send`, trailing `+` are now supported in trait objects,
4223 and better error reporting for trait objects starting with `?Sized`.
4224 - [0e+10 is now a valid floating point literal][40589]
4225 - [Now warns if you bind a lifetime parameter to 'static][40734]
4226 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4227 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4228 representation in some cases.][40377]
4233 - [rustc can now emit mir with `--emit mir`][39891]
4234 - [Improved LLVM IR for trivial functions][40367]
4235 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4236 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4237 opportunities found through profiling
4238 - [Improved backtrace formatting when panicking][38165]
4243 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4244 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4245 iteration or reallocation.
4246 - [Simplified HashMap Bucket interface][40561] provides performance
4247 improvements for iterating and cloning.
4248 - [Specialize Vec::from_elem to use calloc][40409]
4249 - [Fixed Race condition in fs::create_dir_all][39799]
4250 - [No longer caching stdio on Windows][40516]
4251 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4252 2.50%~ faster and in one case now 12.50% faster.
4253 - [Optimized `AtomicBool::fetch_nand`][41143]
4258 - [`Child::try_wait`]
4259 - [`HashMap::retain`]
4260 - [`HashSet::retain`]
4262 - [`TcpStream::peek`]
4263 - [`UdpSocket::peek`]
4264 - [`UdpSocket::peek_from`]
4269 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4270 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4271 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4272 - [Added Android build support][cargo/3885]
4273 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4274 of a certain type, for example `cargo build --bins` will build all
4276 - [Added support for haiku][cargo/3952]
4281 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4282 - [Added rust-windbg script for better debugging on Windows][39983]
4283 - [Rust now uses the official cross compiler for NetBSD][40612]
4284 - [rustdoc now accepts `#` at the start of files][40828]
4285 - [Fixed jemalloc support for musl][41168]
4290 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4291 always placed after the sign if it exists and before the digits. With the `#`
4292 flag the zeroes are placed after the prefix and before the digits.
4293 - [Due to the struct field optimisation][40377], using `transmute` on structs
4294 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4295 always been undefined behavior, but is now more likely to break in practice.
4296 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4297 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4298 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4299 - [Overlapping inherent `impl`s are now a hard error][40728]
4300 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4301 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4302 `out.asm` and `out.ll` instead of only one of the filetypes.
4303 - [ calling a function that returns `Self` will no longer work][41805] when
4304 the size of `Self` cannot be statically determined.
4305 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4306 this has caused a few regressions namely:
4308 - Changed the link order of local static/dynamic libraries (respecting the
4309 order on given rather than having the compiler reorder).
4310 - Changed how MinGW is linked, native code linked to dynamic libraries
4311 may require manually linking to the gcc support library (for the native
4314 [38165]: https://github.com/rust-lang/rust/pull/38165
4315 [39799]: https://github.com/rust-lang/rust/pull/39799
4316 [39891]: https://github.com/rust-lang/rust/pull/39891
4317 [39983]: https://github.com/rust-lang/rust/pull/39983
4318 [40043]: https://github.com/rust-lang/rust/pull/40043
4319 [40241]: https://github.com/rust-lang/rust/pull/40241
4320 [40338]: https://github.com/rust-lang/rust/pull/40338
4321 [40367]: https://github.com/rust-lang/rust/pull/40367
4322 [40377]: https://github.com/rust-lang/rust/pull/40377
4323 [40409]: https://github.com/rust-lang/rust/pull/40409
4324 [40516]: https://github.com/rust-lang/rust/pull/40516
4325 [40556]: https://github.com/rust-lang/rust/pull/40556
4326 [40561]: https://github.com/rust-lang/rust/pull/40561
4327 [40589]: https://github.com/rust-lang/rust/pull/40589
4328 [40612]: https://github.com/rust-lang/rust/pull/40612
4329 [40723]: https://github.com/rust-lang/rust/pull/40723
4330 [40728]: https://github.com/rust-lang/rust/pull/40728
4331 [40731]: https://github.com/rust-lang/rust/pull/40731
4332 [40734]: https://github.com/rust-lang/rust/pull/40734
4333 [40805]: https://github.com/rust-lang/rust/pull/40805
4334 [40807]: https://github.com/rust-lang/rust/pull/40807
4335 [40828]: https://github.com/rust-lang/rust/pull/40828
4336 [40870]: https://github.com/rust-lang/rust/pull/40870
4337 [41085]: https://github.com/rust-lang/rust/pull/41085
4338 [41143]: https://github.com/rust-lang/rust/pull/41143
4339 [41168]: https://github.com/rust-lang/rust/pull/41168
4340 [41270]: https://github.com/rust-lang/rust/issues/41270
4341 [41469]: https://github.com/rust-lang/rust/pull/41469
4342 [41805]: https://github.com/rust-lang/rust/issues/41805
4343 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4344 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4345 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4346 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4347 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4348 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4349 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4350 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4351 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4352 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4353 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4354 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4355 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4356 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4359 Version 1.17.0 (2017-04-27)
4360 ===========================
4365 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4366 * [Fields of structs may be initialized without duplicating the field/variable
4367 names][39761]. [RFC 1682]
4368 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4369 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4370 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4371 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4372 `'b`. Soundness fix.
4373 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4374 * [Static variables may contain references to other statics][40027]
4379 * [Exit quickly on only `--emit dep-info`][40336]
4380 * [Make `-C relocation-model` more correctly determine whether the linker
4381 creates a position-independent executable][40245]
4382 * [Add `-C overflow-checks` to directly control whether integer overflow
4384 * [The rustc type checker now checks items on demand instead of in a single
4385 in-order pass][40008]. This is mostly an internal refactoring in support of
4386 future work, including incremental type checking, but also resolves [RFC
4387 1647], allowing `Self` to appear in `impl` `where` clauses.
4388 * [Optimize vtable loads][39995]
4389 * [Turn off vectorization for Emscripten targets][39990]
4390 * [Provide suggestions for unknown macros imported with `use`][39953]
4391 * [Fix ICEs in path resolution][39939]
4392 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4393 * [Add clearer error message using `&str + &str`][39116]
4404 * [`Ordering::then`]
4405 * [`Ordering::then_with`]
4406 * [`BTreeMap::range`]
4407 * [`BTreeMap::range_mut`]
4408 * [`collections::Bound`]
4409 * [`process::abort`]
4410 * [`ptr::read_unaligned`]
4411 * [`ptr::write_unaligned`]
4412 * [`Result::expect_err`]
4415 * [`Cell::into_inner`]
4421 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4422 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4423 * [`String` implements `FromIterator<&char>`][40028]
4424 * `Box` [implements][40009] a number of new conversions:
4425 `From<Box<str>> for String`,
4426 `From<Box<[T]>> for Vec<T>`,
4427 `From<Box<CStr>> for CString`,
4428 `From<Box<OsStr>> for OsString`,
4429 `From<Box<Path>> for PathBuf`,
4430 `Into<Box<str>> for String`,
4431 `Into<Box<[T]>> for Vec<T>`,
4432 `Into<Box<CStr>> for CString`,
4433 `Into<Box<OsStr>> for OsString`,
4434 `Into<Box<Path>> for PathBuf`,
4435 `Default for Box<str>`,
4436 `Default for Box<CStr>`,
4437 `Default for Box<OsStr>`,
4438 `From<&CStr> for Box<CStr>`,
4439 `From<&OsStr> for Box<OsStr>`,
4440 `From<&Path> for Box<Path>`
4441 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4442 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4443 * [Slightly optimize `slice::sort`][39538]
4444 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4445 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4446 `Box<str>` implements `From<&str>`][39438]
4447 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4448 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4449 * [`format!` estimates the needed capacity before writing a string][39356]
4450 * [Support unprivileged symlink creation in Windows][38921]
4451 * [`PathBuf` implements `Default`][38764]
4452 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4453 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4454 and poor hash functions.
4459 * [Add `cargo check --all`][cargo/3731]
4460 * [Add an option to ignore SSL revocation checking][cargo/3699]
4461 * [Add `cargo run --package`][cargo/3691]
4462 * [Add `required_features`][cargo/3667]
4463 * [Assume `build.rs` is a build script][cargo/3664]
4464 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4469 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4471 * [The "Unstable Book" documents nightly-only features][ubook]
4472 * [Improve the style of the sidebar in rustdoc output][40265]
4473 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4474 * [Fix MSP430 breakage due to `i128`][40257]
4475 * [Preliminary Solaris/SPARCv9 support][39903]
4476 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4477 run without installing the MSVC runtime.
4478 * [`rustdoc --test` includes file names in test names][39788]
4479 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4480 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4481 * [Initial support for `aarch64-unknown-freebsd`][39491]
4482 * [Initial support for `i686-unknown-netbsd`][39426]
4483 * [This release no longer includes the old makefile build system][39431]. Rust
4484 is built with a custom build system, written in Rust, and with Cargo.
4485 * [Add Debug implementations for libcollection structs][39002]
4486 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4487 * [`--test-threads=0` produces an error][38945]
4488 * [`rustup` installs documentation by default][40526]
4489 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4490 WinDbg and Visual Studio to improve the debugging experience.
4495 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4496 workaround, either use MSVC 2015 or run vcvars.bat.
4497 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4498 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4499 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4501 * [`format!` and `Display::to_string` panic if an underlying formatting
4502 implementation returns an error][40117]. Previously the error was silently
4503 ignored. It is incorrect for `write_fmt` to return an error when writing
4505 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4506 crates were marked stable and could be accessed from the stable toolchain.
4507 * [Rust git source no longer includes vendored crates][39728]. Those that need
4508 to build with vendored crates should build from release tarballs.
4509 * [Fix inert attributes from `proc_macro_derives`][39572]
4510 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4511 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4513 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4514 existing code generally ignores the type of dead-code unless a type-hint is
4515 provided; this can cause surprising inference interactions particularly around
4516 defaulting. The new code uniformly ignores the result type of dead-code.
4517 * [Tuple-struct constructors with private fields are no longer visible][38932]
4518 * [Lifetime parameters that do not appear in the arguments are now considered
4519 early-bound][38897], resolving a soundness bug (#[32330]). The
4520 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4522 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4523 * [Make transmuting from fn item types to pointer-sized types a hard
4526 [27787]: https://github.com/rust-lang/rust/issues/27787
4527 [32330]: https://github.com/rust-lang/rust/issues/32330
4528 [34198]: https://github.com/rust-lang/rust/pull/34198
4529 [38161]: https://github.com/rust-lang/rust/pull/38161
4530 [38368]: https://github.com/rust-lang/rust/pull/38368
4531 [38584]: https://github.com/rust-lang/rust/issues/38584
4532 [38661]: https://github.com/rust-lang/rust/pull/38661
4533 [38764]: https://github.com/rust-lang/rust/pull/38764
4534 [38864]: https://github.com/rust-lang/rust/issues/38864
4535 [38897]: https://github.com/rust-lang/rust/pull/38897
4536 [38921]: https://github.com/rust-lang/rust/pull/38921
4537 [38932]: https://github.com/rust-lang/rust/pull/38932
4538 [38945]: https://github.com/rust-lang/rust/pull/38945
4539 [38981]: https://github.com/rust-lang/rust/pull/38981
4540 [39002]: https://github.com/rust-lang/rust/pull/39002
4541 [39116]: https://github.com/rust-lang/rust/pull/39116
4542 [39193]: https://github.com/rust-lang/rust/pull/39193
4543 [39265]: https://github.com/rust-lang/rust/pull/39265
4544 [39356]: https://github.com/rust-lang/rust/pull/39356
4545 [39372]: https://github.com/rust-lang/rust/pull/39372
4546 [39426]: https://github.com/rust-lang/rust/pull/39426
4547 [39431]: https://github.com/rust-lang/rust/pull/39431
4548 [39438]: https://github.com/rust-lang/rust/pull/39438
4549 [39440]: https://github.com/rust-lang/rust/pull/39440
4550 [39485]: https://github.com/rust-lang/rust/pull/39485
4551 [39491]: https://github.com/rust-lang/rust/pull/39491
4552 [39518]: https://github.com/rust-lang/rust/pull/39518
4553 [39538]: https://github.com/rust-lang/rust/pull/39538
4554 [39572]: https://github.com/rust-lang/rust/pull/39572
4555 [39633]: https://github.com/rust-lang/rust/pull/39633
4556 [39642]: https://github.com/rust-lang/rust/pull/39642
4557 [39728]: https://github.com/rust-lang/rust/pull/39728
4558 [39761]: https://github.com/rust-lang/rust/pull/39761
4559 [39788]: https://github.com/rust-lang/rust/pull/39788
4560 [39793]: https://github.com/rust-lang/rust/pull/39793
4561 [39837]: https://github.com/rust-lang/rust/pull/39837
4562 [39843]: https://github.com/rust-lang/rust/pull/39843
4563 [39851]: https://github.com/rust-lang/rust/pull/39851
4564 [39903]: https://github.com/rust-lang/rust/pull/39903
4565 [39939]: https://github.com/rust-lang/rust/pull/39939
4566 [39953]: https://github.com/rust-lang/rust/pull/39953
4567 [39960]: https://github.com/rust-lang/rust/pull/39960
4568 [39990]: https://github.com/rust-lang/rust/pull/39990
4569 [39995]: https://github.com/rust-lang/rust/pull/39995
4570 [40008]: https://github.com/rust-lang/rust/pull/40008
4571 [40009]: https://github.com/rust-lang/rust/pull/40009
4572 [40027]: https://github.com/rust-lang/rust/pull/40027
4573 [40028]: https://github.com/rust-lang/rust/pull/40028
4574 [40037]: https://github.com/rust-lang/rust/pull/40037
4575 [40117]: https://github.com/rust-lang/rust/pull/40117
4576 [40166]: https://github.com/rust-lang/rust/pull/40166
4577 [40245]: https://github.com/rust-lang/rust/pull/40245
4578 [40257]: https://github.com/rust-lang/rust/pull/40257
4579 [40261]: https://github.com/rust-lang/rust/pull/40261
4580 [40265]: https://github.com/rust-lang/rust/pull/40265
4581 [40319]: https://github.com/rust-lang/rust/pull/40319
4582 [40336]: https://github.com/rust-lang/rust/pull/40336
4583 [40526]: https://github.com/rust-lang/rust/pull/40526
4584 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4585 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4586 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4587 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4588 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4589 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4590 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4591 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4592 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4593 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4594 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4595 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4596 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4597 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4598 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4599 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4600 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4601 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4602 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4603 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4604 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4605 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4606 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4607 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4608 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4609 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4610 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4611 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4612 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4613 [mdbook]: https://crates.io/crates/mdbook
4614 [ubook]: https://doc.rust-lang.org/unstable-book/
4617 Version 1.16.0 (2017-03-16)
4618 ===========================
4623 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4624 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4625 match patterns][38069]
4626 * [Clean up semantics of `self` in an import list][38313]
4627 * [`Self` may appear in `impl` headers][38920]
4628 * [`Self` may appear in struct expressions][39282]
4633 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4634 a `.rmeta` file containing only crate metadata][38571]. This can be
4635 used by tools like the Rust Language Service to perform
4636 metadata-only builds.
4637 * [Levenshtein based typo suggestions now work in most places, while
4638 previously they worked only for fields and sometimes for local
4639 variables][38927]. Together with the overhaul of "no
4640 resolution"/"unexpected resolution" errors (#[38154]) they result in
4641 large and systematic improvement in resolution diagnostics.
4642 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4644 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4645 * [`rustc` no longer attempts to provide "consider using an explicit
4646 lifetime" suggestions][37057]. They were inaccurate.
4651 * [`VecDeque::truncate`]
4652 * [`VecDeque::resize`]
4653 * [`String::insert_str`]
4654 * [`Duration::checked_add`]
4655 * [`Duration::checked_sub`]
4656 * [`Duration::checked_div`]
4657 * [`Duration::checked_mul`]
4660 * [`SocketAddr::is_ipv4`]
4661 * [`SocketAddr::is_ipv6`]
4662 * [`IpAddr::is_ipv4`]
4663 * [`IpAddr::is_ipv6`]
4665 * [`Vec::dedup_by_key`]
4666 * [`Result::unwrap_or_default`]
4667 * [`<*const T>::wrapping_offset`]
4668 * [`<*mut T>::wrapping_offset`]
4669 * `CommandExt::creation_flags`
4670 * [`File::set_permissions`]
4671 * [`String::split_off`]
4676 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4677 their argument by `Borrow` parameter][37761]
4678 * [All public types in std implement `Debug`][38006]
4679 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4680 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4681 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4683 * [std: Fix partial writes in `LineWriter`][38062]
4684 * [std: Clamp max read/write sizes on Unix][38062]
4685 * [Use more specific panic message for `&str` slicing errors][38066]
4686 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4687 functionality cannot be achieved in std currently.
4688 * [`writeln!`, like `println!`, now accepts a form with no string
4689 or formatting arguments, to just print a newline][38469]
4690 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4691 * [Reduce the size of static data in `std_unicode::tables`][38781]
4692 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4693 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4695 * [`Duration` implements `Sum`][38712]
4696 * [`String` implements `ToSocketAddrs`][39048]
4701 * [The `cargo check` command does a type check of a project without
4702 building it][cargo/3296]
4703 * [crates.io will display CI badges from Travis and AppVeyor, if
4704 specified in Cargo.toml][cargo/3546]
4705 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4706 * [Compilation profiles accept integer values for `debug`, in addition
4707 to `true` and `false`. These are passed to `rustc` as the value to
4708 `-C debuginfo`][cargo/3534]
4709 * [Implement `cargo --version --verbose`][cargo/3604]
4710 * [All builds now output 'dep-info' build dependencies compatible with
4711 make and ninja][cargo/3557]
4712 * [Build all workspace members with `build --all`][cargo/3511]
4713 * [Document all workspace members with `doc --all`][cargo/3515]
4714 * [Path deps outside workspace are not members][cargo/3443]
4719 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4720 the path to the Rust implementation][38589]
4721 * [The `armv7-linux-androideabi` target no longer enables NEON
4722 extensions, per Google's ABI guide][38413]
4723 * [The stock standard library can be compiled for Redox OS][38401]
4724 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4726 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4728 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4733 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4734 match patterns][38069]
4735 * In this release, references to uninhabited types can not be
4736 pattern-matched. This was accidentally allowed in 1.15.
4737 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4738 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4740 * [Clean up semantics of `self` in an import list][38313]
4741 * Reimplemented lifetime elision. This change was almost entirely compatible
4742 with existing code, but it did close a number of small bugs and loopholes,
4743 as well as being more accepting in some other [cases][41105].
4745 [37057]: https://github.com/rust-lang/rust/pull/37057
4746 [37761]: https://github.com/rust-lang/rust/pull/37761
4747 [38006]: https://github.com/rust-lang/rust/pull/38006
4748 [38051]: https://github.com/rust-lang/rust/pull/38051
4749 [38062]: https://github.com/rust-lang/rust/pull/38062
4750 [38062]: https://github.com/rust-lang/rust/pull/38622
4751 [38066]: https://github.com/rust-lang/rust/pull/38066
4752 [38069]: https://github.com/rust-lang/rust/pull/38069
4753 [38131]: https://github.com/rust-lang/rust/pull/38131
4754 [38154]: https://github.com/rust-lang/rust/pull/38154
4755 [38274]: https://github.com/rust-lang/rust/pull/38274
4756 [38304]: https://github.com/rust-lang/rust/pull/38304
4757 [38313]: https://github.com/rust-lang/rust/pull/38313
4758 [38314]: https://github.com/rust-lang/rust/pull/38314
4759 [38327]: https://github.com/rust-lang/rust/pull/38327
4760 [38401]: https://github.com/rust-lang/rust/pull/38401
4761 [38413]: https://github.com/rust-lang/rust/pull/38413
4762 [38469]: https://github.com/rust-lang/rust/pull/38469
4763 [38559]: https://github.com/rust-lang/rust/pull/38559
4764 [38571]: https://github.com/rust-lang/rust/pull/38571
4765 [38580]: https://github.com/rust-lang/rust/pull/38580
4766 [38589]: https://github.com/rust-lang/rust/pull/38589
4767 [38670]: https://github.com/rust-lang/rust/pull/38670
4768 [38712]: https://github.com/rust-lang/rust/pull/38712
4769 [38726]: https://github.com/rust-lang/rust/pull/38726
4770 [38781]: https://github.com/rust-lang/rust/pull/38781
4771 [38798]: https://github.com/rust-lang/rust/pull/38798
4772 [38909]: https://github.com/rust-lang/rust/pull/38909
4773 [38920]: https://github.com/rust-lang/rust/pull/38920
4774 [38927]: https://github.com/rust-lang/rust/pull/38927
4775 [39048]: https://github.com/rust-lang/rust/pull/39048
4776 [39282]: https://github.com/rust-lang/rust/pull/39282
4777 [39379]: https://github.com/rust-lang/rust/pull/39379
4778 [41105]: https://github.com/rust-lang/rust/issues/41105
4779 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4780 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4781 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4782 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4783 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4784 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4785 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4786 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4787 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4788 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4789 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4790 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4791 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4792 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4793 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4794 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4795 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4796 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4797 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4798 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4799 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4800 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4801 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4802 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4803 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4804 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4805 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4806 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4807 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4808 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4811 Version 1.15.1 (2017-02-09)
4812 ===========================
4814 * [Fix IntoIter::as_mut_slice's signature][39466]
4815 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4817 [39466]: https://github.com/rust-lang/rust/pull/39466
4818 [39523]: https://github.com/rust-lang/rust/pull/39523
4821 Version 1.15.0 (2017-02-02)
4822 ===========================
4827 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4828 stable. This allows popular code-generating crates like Serde and Diesel to
4829 work ergonomically. [RFC 1681].
4830 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4831 with curly braces][36868]. Part of [RFC 1506].
4832 * [A number of minor changes to name resolution have been activated][37127].
4833 They add up to more consistent semantics, allowing for future evolution of
4834 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4835 details of what is different. The breaking changes here have been transitioned
4836 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4837 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4839 * [`?Sized` can be used in `where` clauses][37791]
4840 * [There is now a limit on the size of monomorphized types and it can be
4841 modified with the `#![type_size_limit]` crate attribute, similarly to
4842 the `#![recursion_limit]` attribute][37789]
4847 * [On Windows, the compiler will apply dllimport attributes when linking to
4848 extern functions][37973]. Additional attributes and flags can control which
4849 library kind is linked and its name. [RFC 1717].
4850 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4851 * [The `--test` flag works with procedural macro crates][38107]
4852 * [Fix `extern "aapcs" fn` ABI][37814]
4853 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4854 * [The `format!` expander recognizes incorrect `printf` and shell-style
4855 formatting directives and suggests the correct format][37613].
4856 * [Only report one error for all unused imports in an import list][37456]
4858 Compiler Performance
4859 --------------------
4861 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4862 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4863 * [Don't clone in `UnificationTable::probe`][37848]
4864 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4865 * [Use small vectors in type walker][37760]
4866 * [Macro expansion performance was improved][37701]
4867 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4868 * [Replace FNV with a faster hash function][37229]
4873 * [`std::iter::Iterator::min_by`]
4874 * [`std::iter::Iterator::max_by`]
4875 * [`std::os::*::fs::FileExt`]
4876 * [`std::sync::atomic::Atomic*::get_mut`]
4877 * [`std::sync::atomic::Atomic*::into_inner`]
4878 * [`std::vec::IntoIter::as_slice`]
4879 * [`std::vec::IntoIter::as_mut_slice`]
4880 * [`std::sync::mpsc::Receiver::try_iter`]
4881 * [`std::os::unix::process::CommandExt::before_exec`]
4882 * [`std::rc::Rc::strong_count`]
4883 * [`std::rc::Rc::weak_count`]
4884 * [`std::sync::Arc::strong_count`]
4885 * [`std::sync::Arc::weak_count`]
4886 * [`std::char::encode_utf8`]
4887 * [`std::char::encode_utf16`]
4888 * [`std::cell::Ref::clone`]
4889 * [`std::io::Take::into_inner`]
4894 * [The standard sorting algorithm has been rewritten for dramatic performance
4895 improvements][38192]. It is a hybrid merge sort, drawing influences from
4896 Timsort. Previously it was a naive merge sort.
4897 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4898 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4900 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4901 and `char_indices().last()`][37882]
4902 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4903 * [Chinese characters display correctly in `fmt::Debug`][37855]
4904 * [Derive `Default` for `Duration`][37699]
4905 * [Support creation of anonymous pipes on WinXP/2k][37677]
4906 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4907 * [Don't pass overlapped handles to processes][38835]
4912 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4913 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4914 should instead check the variable at runtime with `std::env`. That the value
4915 was set at build time was a bug, and incorrect when cross-compiling. This
4916 change is known to cause breakage.
4917 * [Add `--all` flag to `cargo test`][cargo/3221]
4918 * [Compile statically against the MSVC CRT][cargo/3363]
4919 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4920 * [Link OpenSSL statically on OSX][cargo/3311]
4921 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4922 * [Test for bad path overrides with summaries][cargo/3336]
4923 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4924 * [Fix retrying crate downloads for network errors][cargo/3348]
4925 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4926 * [Emit more info on --message-format=json][cargo/3319]
4927 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4928 * [Don't ignore errors in workspace manifest][cargo/3409]
4929 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4934 * [Test runners (binaries built with `--test`) now support a `--list` argument
4935 that lists the tests it contains][38185]
4936 * [Test runners now support a `--exact` argument that makes the test filter
4937 match exactly, instead of matching only a substring of the test name][38181]
4938 * [rustdoc supports a `--playground-url` flag][37763]
4939 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4944 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4945 continue to be used in this release by passing `--disable-rustbuild` to the
4946 configure script, but they will be deleted soon. Note that the new build
4947 system uses a different on-disk layout that will likely affect any scripts
4949 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4951 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4952 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4958 * [A number of minor changes to name resolution have been activated][37127].
4959 They add up to more consistent semantics, allowing for future evolution of
4960 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4961 details of what is different. The breaking changes here have been transitioned
4962 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4963 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4964 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4965 should instead check the variable at runtime with `std::env`. That the value
4966 was set at build time was a bug, and incorrect when cross-compiling. This
4967 change is known to cause breakage.
4968 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4969 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4970 1.10 and is now an error by default. It will become a hard error in the near
4972 * [The semantics relating modules to file system directories are changing in
4973 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4974 lint, which is a warning in this release, and will become a hard error in the
4976 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4977 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4978 the underlying iterator][37834]
4980 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4981 [33685]: https://github.com/rust-lang/rust/issues/33685
4982 [36868]: https://github.com/rust-lang/rust/pull/36868
4983 [37127]: https://github.com/rust-lang/rust/pull/37127
4984 [37229]: https://github.com/rust-lang/rust/pull/37229
4985 [37456]: https://github.com/rust-lang/rust/pull/37456
4986 [37527]: https://github.com/rust-lang/rust/pull/37527
4987 [37602]: https://github.com/rust-lang/rust/pull/37602
4988 [37613]: https://github.com/rust-lang/rust/pull/37613
4989 [37615]: https://github.com/rust-lang/rust/pull/37615
4990 [37636]: https://github.com/rust-lang/rust/pull/37636
4991 [37627]: https://github.com/rust-lang/rust/pull/37627
4992 [37642]: https://github.com/rust-lang/rust/pull/37642
4993 [37677]: https://github.com/rust-lang/rust/pull/37677
4994 [37699]: https://github.com/rust-lang/rust/pull/37699
4995 [37701]: https://github.com/rust-lang/rust/pull/37701
4996 [37705]: https://github.com/rust-lang/rust/pull/37705
4997 [37749]: https://github.com/rust-lang/rust/pull/37749
4998 [37760]: https://github.com/rust-lang/rust/pull/37760
4999 [37763]: https://github.com/rust-lang/rust/pull/37763
5000 [37764]: https://github.com/rust-lang/rust/pull/37764
5001 [37789]: https://github.com/rust-lang/rust/pull/37789
5002 [37791]: https://github.com/rust-lang/rust/pull/37791
5003 [37814]: https://github.com/rust-lang/rust/pull/37814
5004 [37817]: https://github.com/rust-lang/rust/pull/37817
5005 [37834]: https://github.com/rust-lang/rust/pull/37834
5006 [37848]: https://github.com/rust-lang/rust/pull/37848
5007 [37855]: https://github.com/rust-lang/rust/pull/37855
5008 [37882]: https://github.com/rust-lang/rust/pull/37882
5009 [37888]: https://github.com/rust-lang/rust/pull/37888
5010 [37973]: https://github.com/rust-lang/rust/pull/37973
5011 [37979]: https://github.com/rust-lang/rust/pull/37979
5012 [38086]: https://github.com/rust-lang/rust/pull/38086
5013 [38107]: https://github.com/rust-lang/rust/pull/38107
5014 [38117]: https://github.com/rust-lang/rust/pull/38117
5015 [38134]: https://github.com/rust-lang/rust/pull/38134
5016 [38146]: https://github.com/rust-lang/rust/pull/38146
5017 [38181]: https://github.com/rust-lang/rust/pull/38181
5018 [38182]: https://github.com/rust-lang/rust/pull/38182
5019 [38185]: https://github.com/rust-lang/rust/pull/38185
5020 [38192]: https://github.com/rust-lang/rust/pull/38192
5021 [38279]: https://github.com/rust-lang/rust/pull/38279
5022 [38835]: https://github.com/rust-lang/rust/pull/38835
5023 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5024 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5025 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5026 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5027 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5028 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5029 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5030 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5031 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5032 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5033 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5034 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5035 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5036 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5037 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5038 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5039 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5040 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5041 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5042 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5043 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5044 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5045 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5046 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5047 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5048 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5049 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5050 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5051 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5052 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5053 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5054 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5055 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5056 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5057 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5058 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5059 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5060 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5063 Version 1.14.0 (2016-12-22)
5064 ===========================
5069 * [`..` matches multiple tuple fields in enum variants, structs
5070 and tuples][36843]. [RFC 1492].
5071 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5072 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5073 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5074 dereferencing][36822]
5079 * [Mark enums with non-zero discriminant as non-zero][37224]
5080 * [Lower-case `static mut` names are linted like other
5081 statics and consts][37162]
5082 * [Fix ICE on some macros in const integer positions
5083 (e.g. `[u8; m!()]`)][36819]
5084 * [Improve error message and snippet for "did you mean `x`"][36798]
5085 * [Add a panic-strategy field to the target specification][36794]
5086 * [Include LLVM version in `--version --verbose`][37200]
5088 Compile-time Optimizations
5089 --------------------------
5091 * [Improve macro expansion performance][37569]
5092 * [Shrink `Expr_::ExprInlineAsm`][37445]
5093 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5094 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5095 * [Avoid more allocations when compiling html5ever][37373]
5096 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5097 * [Avoid some allocations in the macro parser][37318]
5098 * [Use a faster deflate setting][37298]
5099 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5100 during interning of slices][37270]
5101 * [Optimize `write_metadata`][37267]
5102 * [Don't process obligation forest cycles when stalled][37231]
5103 * [Avoid many `CrateConfig` clones][37161]
5104 * [Optimize `Substs::super_fold_with`][37108]
5105 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5106 * [Speed up `plug_leaks`][36917]
5111 * [`println!()`, with no arguments, prints newline][36825].
5112 Previously, an empty string was required to achieve the same.
5113 * [`Wrapping` impls standard binary and unary operators, as well as
5114 the `Sum` and `Product` iterators][37356]
5115 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5117 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5118 `VecDeque` iterators][37315]
5119 * [Improve `SipHasher` performance on small values][37312]
5120 * [Add Iterator trait TrustedLen to enable better FromIterator /
5122 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5123 * [`ReadDir` implements `Debug`][37221]
5124 * [Implement `RefUnwindSafe` for atomic types][37178]
5125 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5126 * [Avoid allocations in `Decoder::read_str`][37064]
5127 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5128 * [Impl `Debug` for raw pointers to unsized data][36880]
5129 * [Don't reuse `HashMap` random seeds][37470]
5130 * [The internal memory layout of `HashMap` is more cache-friendly, for
5131 significant improvements in some operations][36692]
5132 * [`HashMap` uses less memory on 32-bit architectures][36595]
5133 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5138 * [Expose rustc cfg values to build scripts][cargo/3243]
5139 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5140 * [Fix passing --features when testing multiple packages][cargo/3280]
5141 * [Use a single profile set per workspace][cargo/3249]
5142 * [Load `replace` sections from lock files][cargo/3220]
5143 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5148 * [rustup is the recommended Rust installation method][1.14rustup]
5149 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5150 S390x. These are [tier 2] platforms and may have major defects. Follow the
5151 instructions on the website to install, or add the targets to an existing
5152 installation with `rustup target add`. The new target triples are:
5153 - `mips-unknown-linux-gnu`
5154 - `mipsel-unknown-linux-gnu`
5155 - `mips64-unknown-linux-gnuabi64`
5156 - `mips64el-unknown-linux-gnuabi64 `
5157 - `powerpc-unknown-linux-gnu`
5158 - `powerpc64-unknown-linux-gnu`
5159 - `powerpc64le-unknown-linux-gnu`
5160 - `s390x-unknown-linux-gnu `
5161 * This release includes target (std) builds for ARM Linux running MUSL
5162 libc. These are [tier 2] platforms and may have major defects. Add the
5163 following triples to an existing rustup installation with `rustup target add`:
5164 - `arm-unknown-linux-musleabi`
5165 - `arm-unknown-linux-musleabihf`
5166 - `armv7-unknown-linux-musleabihf`
5167 * This release includes [experimental support for WebAssembly][1.14wasm], via
5168 the `wasm32-unknown-emscripten` target. This target is known to have major
5169 defects. Please test, report, and fix.
5170 * rustup no longer installs documentation by default. Run `rustup
5171 component add rust-docs` to install.
5172 * [Fix line stepping in debugger][37310]
5173 * [Enable line number debuginfo in releases][37280]
5178 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5179 * [Add support for Fuchsia OS][37313]
5180 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5185 * [A number of forward-compatibility lints used by the compiler
5186 to gradually introduce language changes have been converted
5187 to deny by default][36894]:
5188 - ["use of inaccessible extern crate erroneously allowed"][36886]
5189 - ["type parameter default erroneously allowed in invalid location"][36887]
5190 - ["detects super or self keywords at the beginning of global path"][36888]
5191 - ["two overlapping inherent impls define an item with the same name
5192 were erroneously allowed"][36889]
5193 - ["floating-point constants cannot be used in patterns"][36890]
5194 - ["constants of struct or enum type can only be used in a pattern if
5195 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5196 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5197 * [Prohibit patterns in trait methods without bodies][37378]
5198 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5199 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5200 * [The `$crate` macro variable is accepted in fewer locations][37213]
5201 * [Impls specifying extra region requirements beyond the trait
5202 they implement are rejected][37167]
5203 * [Enums may not be unsized][37111]. Unsized enums are intended to
5204 work but never have. For now they are forbidden.
5205 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5207 [tier 2]: https://forge.rust-lang.org/platform-support.html
5208 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5209 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5210 [36430]: https://github.com/rust-lang/rust/pull/36430
5211 [36595]: https://github.com/rust-lang/rust/pull/36595
5212 [36595]: https://github.com/rust-lang/rust/pull/36595
5213 [36692]: https://github.com/rust-lang/rust/pull/36692
5214 [36767]: https://github.com/rust-lang/rust/pull/36767
5215 [36794]: https://github.com/rust-lang/rust/pull/36794
5216 [36798]: https://github.com/rust-lang/rust/pull/36798
5217 [36819]: https://github.com/rust-lang/rust/pull/36819
5218 [36822]: https://github.com/rust-lang/rust/pull/36822
5219 [36825]: https://github.com/rust-lang/rust/pull/36825
5220 [36843]: https://github.com/rust-lang/rust/pull/36843
5221 [36880]: https://github.com/rust-lang/rust/pull/36880
5222 [36886]: https://github.com/rust-lang/rust/issues/36886
5223 [36887]: https://github.com/rust-lang/rust/issues/36887
5224 [36888]: https://github.com/rust-lang/rust/issues/36888
5225 [36889]: https://github.com/rust-lang/rust/issues/36889
5226 [36890]: https://github.com/rust-lang/rust/issues/36890
5227 [36891]: https://github.com/rust-lang/rust/issues/36891
5228 [36892]: https://github.com/rust-lang/rust/issues/36892
5229 [36894]: https://github.com/rust-lang/rust/pull/36894
5230 [36917]: https://github.com/rust-lang/rust/pull/36917
5231 [36993]: https://github.com/rust-lang/rust/pull/36993
5232 [37037]: https://github.com/rust-lang/rust/pull/37037
5233 [37064]: https://github.com/rust-lang/rust/pull/37064
5234 [37094]: https://github.com/rust-lang/rust/pull/37094
5235 [37108]: https://github.com/rust-lang/rust/pull/37108
5236 [37111]: https://github.com/rust-lang/rust/pull/37111
5237 [37161]: https://github.com/rust-lang/rust/pull/37161
5238 [37162]: https://github.com/rust-lang/rust/pull/37162
5239 [37167]: https://github.com/rust-lang/rust/pull/37167
5240 [37178]: https://github.com/rust-lang/rust/pull/37178
5241 [37200]: https://github.com/rust-lang/rust/pull/37200
5242 [37213]: https://github.com/rust-lang/rust/pull/37213
5243 [37221]: https://github.com/rust-lang/rust/pull/37221
5244 [37224]: https://github.com/rust-lang/rust/pull/37224
5245 [37230]: https://github.com/rust-lang/rust/pull/37230
5246 [37231]: https://github.com/rust-lang/rust/pull/37231
5247 [37247]: https://github.com/rust-lang/rust/pull/37247
5248 [37267]: https://github.com/rust-lang/rust/pull/37267
5249 [37270]: https://github.com/rust-lang/rust/pull/37270
5250 [37273]: https://github.com/rust-lang/rust/pull/37273
5251 [37280]: https://github.com/rust-lang/rust/pull/37280
5252 [37298]: https://github.com/rust-lang/rust/pull/37298
5253 [37306]: https://github.com/rust-lang/rust/pull/37306
5254 [37310]: https://github.com/rust-lang/rust/pull/37310
5255 [37312]: https://github.com/rust-lang/rust/pull/37312
5256 [37313]: https://github.com/rust-lang/rust/pull/37313
5257 [37315]: https://github.com/rust-lang/rust/pull/37315
5258 [37318]: https://github.com/rust-lang/rust/pull/37318
5259 [37322]: https://github.com/rust-lang/rust/pull/37322
5260 [37326]: https://github.com/rust-lang/rust/pull/37326
5261 [37351]: https://github.com/rust-lang/rust/pull/37351
5262 [37356]: https://github.com/rust-lang/rust/pull/37356
5263 [37367]: https://github.com/rust-lang/rust/pull/37367
5264 [37373]: https://github.com/rust-lang/rust/pull/37373
5265 [37378]: https://github.com/rust-lang/rust/pull/37378
5266 [37389]: https://github.com/rust-lang/rust/pull/37389
5267 [37392]: https://github.com/rust-lang/rust/pull/37392
5268 [37427]: https://github.com/rust-lang/rust/pull/37427
5269 [37439]: https://github.com/rust-lang/rust/pull/37439
5270 [37445]: https://github.com/rust-lang/rust/pull/37445
5271 [37470]: https://github.com/rust-lang/rust/pull/37470
5272 [37569]: https://github.com/rust-lang/rust/pull/37569
5273 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5274 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5275 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5276 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5277 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5278 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5279 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5282 Version 1.13.0 (2016-11-10)
5283 ===========================
5288 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5289 errors, like the `try!` macro, described in [RFC 0243].
5290 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5291 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5292 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5293 * [Fix lifetime rules for 'if' conditions][36029]
5294 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5299 * [Add the `-C link-arg` argument][36574]
5300 * [Remove the old AST-based backend from rustc_trans][35764]
5301 * [Don't enable NEON by default on armv7 Linux][35814]
5302 * [Fix debug line number info for macro expansions][35238]
5303 * [Do not emit "class method" debuginfo for types that are not
5304 DICompositeType][36008]
5305 * [Warn about multiple conflicting #[repr] hints][34623]
5306 * [When sizing DST, don't double-count nested struct prefixes][36351]
5307 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5308 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5309 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5310 * [Expand macros without recursing to avoid stack overflows][36214]
5315 * [Replace macro backtraces with labeled local uses][35702]
5316 * [Improve error message for misplaced doc comments][33922]
5317 * [Buffer unix and lock windows to prevent message interleaving][35975]
5318 * [Update lifetime errors to specifically note temporaries][36171]
5319 * [Special case a few colors for Windows][36178]
5320 * [Suggest `use self` when such an import resolves][36289]
5321 * [Be more specific when type parameter shadows primitive type][36338]
5322 * Many minor improvements
5324 Compile-time Optimizations
5325 --------------------------
5327 * [Compute and cache HIR hashes at beginning][35854]
5328 * [Don't hash types in loan paths][36004]
5329 * [Cache projections in trans][35761]
5330 * [Optimize the parser's last token handling][36527]
5331 * [Only instantiate #[inline] functions in codegen units referencing
5332 them][36524]. This leads to big improvements in cases where crates export
5333 define many inline functions without using them directly.
5334 * [Lazily allocate TypedArena's first chunk][36592]
5335 * [Don't allocate during default HashSet creation][36734]
5342 * [`overflowing_abs`]
5343 * [`RefCell::try_borrow`]
5344 * [`RefCell::try_borrow_mut`]
5349 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5350 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5352 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5353 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5354 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5355 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5356 * [Use arc4rand on FreeBSD][35884]
5357 * [memrchr: Correct aligned offset computation][35969]
5358 * [Improve Demangling of Rust Symbols][36059]
5359 * [Use monotonic time in condition variables][35048]
5360 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5361 * [Implement conversion traits for `char`][35755]
5362 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5363 * [Zero first byte of CString on drop][36264]
5364 * [Inherit overflow checks for sum and product][36372]
5365 * [Add missing Eq implementations][36423]
5366 * [Implement `Debug` for `DirEntry`][36631]
5367 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5369 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5370 * [Implement more traits for `std::io::ErrorKind`][35911]
5371 * [Optimize BinaryHeap bounds checking][36072]
5372 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5373 `extend_with_element`][36355]
5374 * [Fix overflow checking in unsigned pow()][34942]
5379 * This release includes security fixes to both curl and OpenSSL.
5380 * [Fix transitive doctests when panic=abort][cargo/3021]
5381 * [Add --all-features flag to cargo][cargo/3038]
5382 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5383 * [Don't parse the home directory more than once][cargo/3078]
5384 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5385 * [Update OpenSSL to 1.0.2j][cargo/3121]
5386 * [Add license and license_file to cargo metadata output][cargo/3110]
5387 * [Make crates-io registry URL optional in config; ignore all changes to
5388 source.crates-io][cargo/3089]
5389 * [Don't download dependencies from other platforms][cargo/3123]
5390 * [Build transitive dev-dependencies when needed][cargo/3125]
5391 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5392 * [Avoid updating registry when adding existing deps][cargo/3144]
5393 * [Warn about path overrides that won't work][cargo/3136]
5394 * [Use workspaces during `cargo install`][cargo/3146]
5395 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5396 * [Add --message-format flag][cargo/3000]
5397 * [Pass target environment for rustdoc][cargo/3205]
5398 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5399 * [Update curl and curl-sys][cargo/3241]
5400 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5405 * [rustdoc: Add the `--sysroot` argument][36586]
5406 * [rustdoc: Fix a couple of issues with the search results][35655]
5407 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5408 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5409 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5414 * [Remove unmaintained style guide][35124]
5415 * [Add s390x support][36369]
5416 * [Initial work at Haiku OS support][36727]
5417 * [Add mips-uclibc targets][35734]
5418 * [Crate-ify compiler-rt into compiler-builtins][35021]
5419 * [Add rustc version info (git hash + date) to dist tarball][36213]
5420 * Many documentation improvements
5425 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5426 * [Deny (by default) transmuting from fn item types to pointer-sized
5427 types][34923]. Continuing the long transition to zero-sized fn items,
5429 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5431 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5432 * [Fix lifetime rules for 'if' conditions][36029].
5433 * [Inherit overflow checks for sum and product][36372].
5434 * [Forbid user-defined macros named "macro_rules"][36730].
5436 [33922]: https://github.com/rust-lang/rust/pull/33922
5437 [34623]: https://github.com/rust-lang/rust/pull/34623
5438 [34923]: https://github.com/rust-lang/rust/pull/34923
5439 [34942]: https://github.com/rust-lang/rust/pull/34942
5440 [34982]: https://github.com/rust-lang/rust/pull/34982
5441 [35021]: https://github.com/rust-lang/rust/pull/35021
5442 [35048]: https://github.com/rust-lang/rust/pull/35048
5443 [35074]: https://github.com/rust-lang/rust/pull/35074
5444 [35124]: https://github.com/rust-lang/rust/pull/35124
5445 [35234]: https://github.com/rust-lang/rust/pull/35234
5446 [35238]: https://github.com/rust-lang/rust/pull/35238
5447 [35354]: https://github.com/rust-lang/rust/pull/35354
5448 [35559]: https://github.com/rust-lang/rust/pull/35559
5449 [35585]: https://github.com/rust-lang/rust/pull/35585
5450 [35627]: https://github.com/rust-lang/rust/pull/35627
5451 [35655]: https://github.com/rust-lang/rust/pull/35655
5452 [35702]: https://github.com/rust-lang/rust/pull/35702
5453 [35707]: https://github.com/rust-lang/rust/pull/35707
5454 [35728]: https://github.com/rust-lang/rust/pull/35728
5455 [35734]: https://github.com/rust-lang/rust/pull/35734
5456 [35755]: https://github.com/rust-lang/rust/pull/35755
5457 [35761]: https://github.com/rust-lang/rust/pull/35761
5458 [35764]: https://github.com/rust-lang/rust/pull/35764
5459 [35814]: https://github.com/rust-lang/rust/pull/35814
5460 [35854]: https://github.com/rust-lang/rust/pull/35854
5461 [35871]: https://github.com/rust-lang/rust/pull/35871
5462 [35884]: https://github.com/rust-lang/rust/pull/35884
5463 [35911]: https://github.com/rust-lang/rust/pull/35911
5464 [35969]: https://github.com/rust-lang/rust/pull/35969
5465 [35975]: https://github.com/rust-lang/rust/pull/35975
5466 [36004]: https://github.com/rust-lang/rust/pull/36004
5467 [36008]: https://github.com/rust-lang/rust/pull/36008
5468 [36014]: https://github.com/rust-lang/rust/pull/36014
5469 [36029]: https://github.com/rust-lang/rust/pull/36029
5470 [36059]: https://github.com/rust-lang/rust/pull/36059
5471 [36072]: https://github.com/rust-lang/rust/pull/36072
5472 [36101]: https://github.com/rust-lang/rust/pull/36101
5473 [36104]: https://github.com/rust-lang/rust/pull/36104
5474 [36171]: https://github.com/rust-lang/rust/pull/36171
5475 [36173]: https://github.com/rust-lang/rust/pull/36173
5476 [36178]: https://github.com/rust-lang/rust/pull/36178
5477 [36213]: https://github.com/rust-lang/rust/pull/36213
5478 [36214]: https://github.com/rust-lang/rust/pull/36214
5479 [36264]: https://github.com/rust-lang/rust/pull/36264
5480 [36266]: https://github.com/rust-lang/rust/pull/36266
5481 [36289]: https://github.com/rust-lang/rust/pull/36289
5482 [36338]: https://github.com/rust-lang/rust/pull/36338
5483 [36351]: https://github.com/rust-lang/rust/pull/36351
5484 [36355]: https://github.com/rust-lang/rust/pull/36355
5485 [36369]: https://github.com/rust-lang/rust/pull/36369
5486 [36372]: https://github.com/rust-lang/rust/pull/36372
5487 [36423]: https://github.com/rust-lang/rust/pull/36423
5488 [36482]: https://github.com/rust-lang/rust/pull/36482
5489 [36505]: https://github.com/rust-lang/rust/pull/36505
5490 [36524]: https://github.com/rust-lang/rust/pull/36524
5491 [36527]: https://github.com/rust-lang/rust/pull/36527
5492 [36551]: https://github.com/rust-lang/rust/pull/36551
5493 [36574]: https://github.com/rust-lang/rust/pull/36574
5494 [36586]: https://github.com/rust-lang/rust/pull/36586
5495 [36592]: https://github.com/rust-lang/rust/pull/36592
5496 [36631]: https://github.com/rust-lang/rust/pull/36631
5497 [36639]: https://github.com/rust-lang/rust/pull/36639
5498 [36721]: https://github.com/rust-lang/rust/pull/36721
5499 [36727]: https://github.com/rust-lang/rust/pull/36727
5500 [36730]: https://github.com/rust-lang/rust/pull/36730
5501 [36734]: https://github.com/rust-lang/rust/pull/36734
5502 [36754]: https://github.com/rust-lang/rust/pull/36754
5503 [36995]: https://github.com/rust-lang/rust/pull/36995
5504 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5505 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5506 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5507 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5508 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5509 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5510 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5511 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5512 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5513 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5514 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5515 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5516 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5517 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5518 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5519 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5520 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5521 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5522 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5523 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5524 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5525 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5526 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5527 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5528 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5529 [rustup]: https://www.rustup.rs
5530 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5531 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5532 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5533 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5534 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5535 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5536 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5539 Version 1.12.1 (2016-10-20)
5540 ===========================
5545 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5546 * [Confusion with double negation and booleans][36856]
5547 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5548 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5549 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5550 * [Corrupted memory after updated to 1.12][36936]
5551 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5552 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5553 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5555 [36381]: https://github.com/rust-lang/rust/issues/36381
5556 [36856]: https://github.com/rust-lang/rust/issues/36856
5557 [36875]: https://github.com/rust-lang/rust/issues/36875
5558 [36924]: https://github.com/rust-lang/rust/issues/36924
5559 [36926]: https://github.com/rust-lang/rust/issues/36926
5560 [36936]: https://github.com/rust-lang/rust/issues/36936
5561 [37026]: https://github.com/rust-lang/rust/issues/37026
5562 [37112]: https://github.com/rust-lang/rust/issues/37112
5563 [37153]: https://github.com/rust-lang/rust/issues/37153
5566 Version 1.12.0 (2016-09-29)
5567 ===========================
5572 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5573 This translation pass is far simpler than the previous AST->LLVM pass, and
5574 creates opportunities to perform new optimizations directly on the MIR. It
5575 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5576 * [`rustc` presents a new, more readable error format, along with
5577 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5578 Most common editors supporting Rust have been updated to work with it. It was
5579 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5584 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5585 This translation pass is far simpler than the previous AST->LLVM pass, and
5586 creates opportunities to perform new optimizations directly on the MIR. It
5587 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5588 * [Print the Rust target name, not the LLVM target name, with
5589 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5590 * [The computation of `TypeId` is correct in some cases where it was previously
5591 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5592 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5593 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5594 `--print relocation-models`, and `--print code-models` print the available
5595 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5596 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5597 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5598 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5599 These targets produce statically-linked binaries. There are no binary release
5605 * [`rustc` presents a new, more readable error format, along with
5606 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5607 Most common editors supporting Rust have been updated to work with it. It was
5608 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5609 * [In error descriptions, references are now described in plain English,
5610 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5611 * [In error type descriptions, unknown numeric types are named `{integer}` or
5612 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5613 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5618 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5619 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5620 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5621 useful](https://github.com/rust-lang/rust/pull/34908)
5622 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5623 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5624 * [Semicolons are properly required as statement delimiters inside
5625 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5626 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5631 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5632 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5633 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5634 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5635 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5636 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5637 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5638 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5639 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5640 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5641 Both on Unix and Windows.
5642 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5643 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5644 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5645 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5646 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5647 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5648 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5649 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5654 * [The `format!` macro and friends now allow a single argument to be formatted
5655 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5656 * [The lifetime bounds on `[T]::binary_search_by` and
5657 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5658 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5659 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5660 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5661 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5662 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5663 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5664 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5665 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5666 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5667 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5668 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5669 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5670 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5671 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5672 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5673 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5674 * [`mpsc::sync_channel` `Receiver`s return any available message before
5675 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5676 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5677 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5682 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5683 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5684 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5685 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5686 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5687 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5688 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5689 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5690 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5691 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5692 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5693 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5694 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5695 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5696 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5697 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5702 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5703 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5708 * [Test binaries now support a `--test-threads` argument to specify the number
5709 of threads used to run tests, and which acts the same as the
5710 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5711 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5712 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5713 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5714 * [Rust releases now come with source packages that can be installed by rustup
5715 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5716 The resulting source code can be used by tools and IDES, located in the
5717 sysroot under `lib/rustlib/src`.
5722 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5723 * Many minor improvements to the documentation.
5724 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5729 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5730 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5731 * [When formatting strings, if "precision" is specified, the "fill",
5732 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5733 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5736 Version 1.11.0 (2016-08-18)
5737 ===========================
5742 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5743 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5744 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5745 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5750 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5751 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5752 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5753 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5754 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5755 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5756 (in libcore - previously stabilized in libstd)
5757 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5758 (in libcore - previously stabilized in libstd)
5759 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5760 (in libcore - previously stabilized in libstd)
5761 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5762 (in libcore - previously stabilized in libstd)
5763 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5764 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5765 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5766 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5771 * [The `thread_local!` macro supports multiple definitions in a single
5772 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5773 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5774 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5775 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5776 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5777 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5778 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5779 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5784 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5785 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5786 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5787 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5788 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5789 and `-vv` prints warnings for all crates.
5790 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5791 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5792 This provides room for expansion by arbitrary tools.
5793 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5794 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5795 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5796 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5797 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5798 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5799 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5804 * [Caching projections speeds up type check dramatically for some
5805 workloads](https://github.com/rust-lang/rust/pull/33816)
5806 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5807 This hasher is faster, but is believed to provide sufficient
5808 protection from collision attacks.
5809 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5814 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5815 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5816 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5817 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5818 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5823 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5824 * [When emitting debug info, rustc emits frame pointers for closures,
5825 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5826 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5827 * Many more errors have been given error codes and extended
5829 * API documentation continues to be improved, with many new examples
5834 * [rustc no longer hangs when dependencies recursively re-export
5835 submodules](https://github.com/rust-lang/rust/pull/34542)
5836 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5837 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5838 rewritten](https://github.com/rust-lang/rust/pull/33895)
5839 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5840 No targets use this yet, but it works toward AVR support.
5845 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5846 * [The new follow-set rules that place restrictions on `macro_rules!`
5847 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5848 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5849 and has been a warning since 1.10.
5850 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5851 This causes breakage in some corner cases.
5854 Version 1.10.0 (2016-07-07)
5855 ===========================
5860 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5861 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5862 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5863 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5864 * [`panic!` can be converted to a runtime abort with the
5865 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5866 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5867 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5868 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5869 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5870 Note that Cargo does not yet directly support cdylibs.
5875 * `os::windows::fs::OpenOptionsExt::access_mode`
5876 * `os::windows::fs::OpenOptionsExt::share_mode`
5877 * `os::windows::fs::OpenOptionsExt::custom_flags`
5878 * `os::windows::fs::OpenOptionsExt::attributes`
5879 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5880 * `os::unix::fs::OpenOptionsExt::custom_flags`
5881 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5882 * `Default for sync::Weak`
5883 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5884 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5885 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5886 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5887 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5888 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5889 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5890 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5891 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5892 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5893 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5894 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5895 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5896 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5897 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5898 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5899 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5900 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5901 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5902 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5903 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5904 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5905 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5906 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5907 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5908 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5909 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5910 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5911 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5912 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5913 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5914 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5915 * Read/Write/RawFd impls for `UnixStream`
5916 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5917 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5918 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5919 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5920 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5921 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5922 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5923 * RawFd impls for `UnixListener`
5924 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5925 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5926 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5927 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5928 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5929 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5930 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5931 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5932 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5933 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5934 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5935 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5936 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5937 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5938 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5939 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5940 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5941 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5942 * RawFd impls for `UnixDatagram`
5943 * `{BTree,Hash}Map::values_mut`
5944 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5949 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5950 The semantics of this minor method are subtle and probably not what
5952 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5953 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5954 will fall back to `/dev/urandom` temporarily to avoid blocking
5955 during early boot](https://github.com/rust-lang/rust/pull/33086).
5956 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5957 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5958 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5959 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5960 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5961 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5962 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5966 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5967 This controls the runtime behavior of the `panic!` macro
5968 and can be either "unwind" (the default), or "abort".
5969 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5970 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5971 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5972 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5973 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5974 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5975 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5976 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5977 By default they are retried twice, which can be customized with the
5978 `net.retry` value in `.cargo/config`.
5979 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5980 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5981 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5982 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5983 Makes it possible to install multiple crates in parallel.
5984 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5985 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5986 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5987 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5988 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5989 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5994 * [rustc memory usage was reduced by refactoring the context used for
5995 type checking](https://github.com/rust-lang/rust/pull/33425).
5996 * [Speed up creation of `HashMap`s by caching the random keys used
5997 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5998 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5999 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6000 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6001 10x faster than the previous lookup tables.
6002 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6007 * Many incremental improvements to documentation and rustdoc.
6008 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6009 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6010 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6011 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6012 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6013 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6014 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6019 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6020 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6021 * [`std` no longer prints backtraces on platforms where the running
6022 module must be loaded with `env::current_exe`, which can't be relied
6023 on](https://github.com/rust-lang/rust/pull/33554).
6024 * This release includes std binaries for the i586-unknown-linux-gnu,
6025 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6026 i586 target is for old x86 hardware without SSE2, and the armv7
6027 target is for Android running on modern ARM architectures.
6028 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6029 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6030 * [On Unix the runtime aborts by calling `libc::abort` instead of
6031 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6032 * [Rust is now bootstrapped from the previous release of Rust,
6033 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6038 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6039 * [`target_env` for Linux ARM targets is just `gnu`, not
6040 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6041 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6042 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6043 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6044 Affects how macros are parsed.
6045 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6046 * [Feature-gated attributes on macro-generated macro invocations are
6047 now rejected](https://github.com/rust-lang/rust/pull/32791).
6048 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6049 This caused some minor changes to type inference.
6052 Version 1.9.0 (2016-05-26)
6053 ==========================
6058 * The `#[deprecated]` attribute when applied to an API will generate
6059 warnings when used. The warnings may be suppressed with
6060 `#[allow(deprecated)]`. [RFC 1270].
6061 * [`fn` item types are zero sized, and each `fn` names a unique
6062 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6063 `transmute` on a `fn` type will generate a warning for a few cycles,
6064 then will be converted to an error.
6065 * [Field and method resolution understand visibility, so private
6066 fields and methods cannot prevent the proper use of public fields
6067 and methods][1.9fv].
6068 * [The parser considers unicode codepoints in the
6069 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6075 * [`std::panic::catch_unwind`] (renamed from `recover`)
6076 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6077 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6078 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6079 * [`str::is_char_boundary`]
6080 * [`<*const T>::as_ref`]
6081 * [`<*mut T>::as_ref`]
6082 * [`<*mut T>::as_mut`]
6083 * [`AsciiExt::make_ascii_uppercase`]
6084 * [`AsciiExt::make_ascii_lowercase`]
6085 * [`char::decode_utf16`]
6086 * [`char::DecodeUtf16`]
6087 * [`char::DecodeUtf16Error`]
6088 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6089 * [`BTreeSet::take`]
6090 * [`BTreeSet::replace`]
6093 * [`HashSet::replace`]
6095 * [`OsString::with_capacity`]
6096 * [`OsString::clear`]
6097 * [`OsString::capacity`]
6098 * [`OsString::reserve`]
6099 * [`OsString::reserve_exact`]
6100 * [`OsStr::is_empty`]
6102 * [`std::os::unix::thread`]
6105 * [`JoinHandleExt::as_pthread_t`]
6106 * [`JoinHandleExt::into_pthread_t`]
6107 * [`HashSet::hasher`]
6108 * [`HashMap::hasher`]
6109 * [`CommandExt::exec`]
6110 * [`File::try_clone`]
6111 * [`SocketAddr::set_ip`]
6112 * [`SocketAddr::set_port`]
6113 * [`SocketAddrV4::set_ip`]
6114 * [`SocketAddrV4::set_port`]
6115 * [`SocketAddrV6::set_ip`]
6116 * [`SocketAddrV6::set_port`]
6117 * [`SocketAddrV6::set_flowinfo`]
6118 * [`SocketAddrV6::set_scope_id`]
6119 * [`slice::copy_from_slice`]
6120 * [`ptr::read_volatile`]
6121 * [`ptr::write_volatile`]
6122 * [`OpenOptions::create_new`]
6123 * [`TcpStream::set_nodelay`]
6124 * [`TcpStream::nodelay`]
6125 * [`TcpStream::set_ttl`]
6126 * [`TcpStream::ttl`]
6127 * [`TcpStream::set_only_v6`]
6128 * [`TcpStream::only_v6`]
6129 * [`TcpStream::take_error`]
6130 * [`TcpStream::set_nonblocking`]
6131 * [`TcpListener::set_ttl`]
6132 * [`TcpListener::ttl`]
6133 * [`TcpListener::set_only_v6`]
6134 * [`TcpListener::only_v6`]
6135 * [`TcpListener::take_error`]
6136 * [`TcpListener::set_nonblocking`]
6137 * [`UdpSocket::set_broadcast`]
6138 * [`UdpSocket::broadcast`]
6139 * [`UdpSocket::set_multicast_loop_v4`]
6140 * [`UdpSocket::multicast_loop_v4`]
6141 * [`UdpSocket::set_multicast_ttl_v4`]
6142 * [`UdpSocket::multicast_ttl_v4`]
6143 * [`UdpSocket::set_multicast_loop_v6`]
6144 * [`UdpSocket::multicast_loop_v6`]
6145 * [`UdpSocket::set_multicast_ttl_v6`]
6146 * [`UdpSocket::multicast_ttl_v6`]
6147 * [`UdpSocket::set_ttl`]
6148 * [`UdpSocket::ttl`]
6149 * [`UdpSocket::set_only_v6`]
6150 * [`UdpSocket::only_v6`]
6151 * [`UdpSocket::join_multicast_v4`]
6152 * [`UdpSocket::join_multicast_v6`]
6153 * [`UdpSocket::leave_multicast_v4`]
6154 * [`UdpSocket::leave_multicast_v6`]
6155 * [`UdpSocket::take_error`]
6156 * [`UdpSocket::connect`]
6157 * [`UdpSocket::send`]
6158 * [`UdpSocket::recv`]
6159 * [`UdpSocket::set_nonblocking`]
6164 * [`std::sync::Once` is poisoned if its initialization function
6166 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6167 * [Most types implement `fmt::Debug`][1.9db].
6168 * [The default buffer size used by `BufReader` and `BufWriter` was
6169 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6170 used by other languages.
6171 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6172 `Duration` additionally implements `*=` and `/=`][1.9ta].
6173 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6174 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6175 * [`Chain` implements `BufRead`][1.9ch].
6176 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6181 * [Cargo can now run concurrently][1.9cc].
6182 * [Top-level overrides allow specific revisions of crates to be
6183 overridden through the entire crate graph][1.9ct]. This is intended
6184 to make upgrades easier for large projects, by allowing crates to be
6185 forked temporarily until they've been upgraded and republished.
6186 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6187 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6188 on the commandline][1.9cf]. `rustc` arguments can also be specified
6189 in the `build.rustflags` configuration key.
6194 * [The time complexity of comparing variables for equivalence during type
6195 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6196 to major compilation time improvement in some scenarios.
6197 * [`ToString` is specialized for `str`, giving it the same performance
6198 as `to_owned`][1.9ts].
6199 * [Spawning processes with `Command::output` no longer creates extra
6201 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6202 for C-like enums][1.9cl].
6207 * [Passing the `--quiet` flag to a test runner will produce
6208 much-abbreviated output][1.9q].
6209 * The Rust Project now publishes std binaries for the
6210 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6211 `i586-pc-windows-msvc` targets.
6216 * [`std::sync::Once` is poisoned if its initialization function
6218 * [It is illegal to define methods with the same name in overlapping
6219 inherent `impl` blocks][1.9sn].
6220 * [`fn` item types are zero sized, and each `fn` names a unique
6221 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6222 `transmute` on a `fn` type will generate a warning for a few cycles,
6223 then will be converted to an error.
6224 * [Improvements to const evaluation may trigger new errors when integer
6225 literals are out of range][1.9ce].
6228 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6229 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6230 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6231 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6232 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6233 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6234 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6235 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6236 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6237 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6238 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6239 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6240 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6241 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6242 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6243 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6244 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6245 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6246 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6247 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6248 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6249 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6250 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6251 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6252 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6253 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6254 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6255 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6256 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6257 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6258 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6259 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6260 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6261 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6262 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6263 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6264 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6265 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6266 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6267 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6268 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6269 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6270 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6271 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6272 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6273 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6274 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6275 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6276 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6277 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6278 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6279 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6280 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6281 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6282 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6283 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6284 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6285 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6286 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6287 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6288 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6289 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6290 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6291 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6292 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6293 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6294 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6295 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6296 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6297 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6298 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6299 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6300 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6301 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6302 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6303 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6304 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6305 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6306 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6307 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6308 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6309 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6310 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6311 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6312 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6313 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6314 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6315 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6316 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6317 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6318 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6319 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6320 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6321 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6322 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6323 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6324 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6325 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6326 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6327 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6328 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6329 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6330 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6331 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6332 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6333 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6334 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6335 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6336 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6337 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6340 Version 1.8.0 (2016-04-14)
6341 ==========================
6346 * Rust supports overloading of compound assignment statements like
6347 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6348 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6349 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6351 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6352 addition to the non-braced form, `struct Foo;`. [RFC 218].
6358 * [`str::encode_utf16`] (renamed from `utf16_units`)
6359 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6362 * [`ptr::drop_in_place`]
6364 * [`time::SystemTime`]
6366 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6367 * [`Instant::elapsed`]
6368 * [`SystemTime::now`]
6369 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6370 * [`SystemTime::elapsed`]
6371 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6372 * [`SystemTimeError`]
6373 * [`SystemTimeError::duration`]
6374 * Various impls for `SystemTimeError`
6376 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6377 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6378 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6379 * [The `write!` and `writeln!` macros correctly emit errors if any of
6380 their arguments can't be formatted][1.8w].
6381 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6382 * [The Unix-specific `raw` modules, which contain a number of
6383 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6384 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6385 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6386 across platforms was making it difficult to implement `std`
6387 correctly. Those that need these definitions should use the `libc`
6389 * The Unix-specific `MetadataExt` traits, including
6390 `os::unix::fs::MetadataExt`, which expose values such as inode
6391 numbers [no longer return platform-specific types][1.8r], but
6392 instead return widened integers. [RFC 1415].
6393 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6394 * [Atomic loads and stores are not volatile][1.8a].
6395 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6400 * [Inlining hash functions lead to a 3% compile-time improvement in
6401 some workloads][1.8h].
6402 * When using jemalloc, its symbols are [unprefixed so that it
6403 overrides the libc malloc implementation][1.8h]. This means that for
6404 rustc, LLVM is now using jemalloc, which results in a 6%
6405 compile-time improvement on a specific workload.
6406 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6411 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6412 i686-pc-windows-msvc is now considered a tier-1 platform.
6413 * [The `--print targets` flag prints a list of supported targets][1.8t].
6414 * [The `--print cfg` flag prints the `cfg`s defined for the current
6416 * [`rustc` can be built with an new Cargo-based build system, written
6417 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6418 build system. To enable it configure with `configure --rustbuild`.
6419 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6420 variants while also indicating the total number of missing variants
6421 if more than 3][1.8m].
6422 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6423 * The Rust Project now publishes binary releases of the standard
6424 library for a number of tier-2 targets:
6425 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6426 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6427 `x86_64-rumprun-netbsd`. These can be installed with
6428 tools such as [multirust][1.8mr].
6433 * [`cargo init` creates a new Cargo project in the current
6434 directory][1.8ci]. It is otherwise like `cargo new`.
6435 * [Cargo has configuration keys for `-v` and
6436 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6437 `[term]` section of `.cargo/config`.
6438 * [Configuration keys that evaluate to strings or integers can be set
6439 via environment variables][1.8ce]. For example the `build.jobs` key
6440 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6441 precedence over config files.
6442 * [Target-specific dependencies support Rust `cfg` syntax for
6443 describing targets][1.8cfg] so that dependencies for multiple
6444 targets can be specified together. [RFC 1361].
6445 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6446 `RUSTDOC` take precedence over the `build.target-dir`,
6447 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6448 * [The child process tree is killed on Windows when Cargo is
6450 * [The `build.target` configuration value sets the target platform,
6451 like `--target`][1.8ct].
6456 * [Unstable compiler flags have been further restricted][1.8u]. Since
6457 1.0 `-Z` flags have been considered unstable, and other flags that
6458 were considered unstable additionally required passing `-Z
6459 unstable-options` to access. Unlike unstable language and library
6460 features though, these options have been accessible on the stable
6461 release channel. Going forward, *new unstable flags will not be
6462 available on the stable release channel*, and old unstable flags
6463 will warn about their usage. In the future, all unstable flags will
6464 be unavailable on the stable release channel.
6465 * [It is no longer possible to `match` on empty enum variants using
6466 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6467 * The Unix-specific `MetadataExt` traits, including
6468 `os::unix::fs::MetadataExt`, which expose values such as inode
6469 numbers [no longer return platform-specific types][1.8r], but
6470 instead return widened integers. [RFC 1415].
6471 * [Modules sourced from the filesystem cannot appear within arbitrary
6472 blocks, but only within other modules][1.8mf].
6473 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6474 * On Unix, [stack overflow triggers a runtime abort instead of a
6476 * [`Command::spawn` and its equivalents return an error if any of
6477 its command-line arguments contain interior `NUL`s][1.8n].
6478 * [Tuple and unit enum variants from other crates are in the type
6480 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6481 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6482 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6483 instead of `foo.lib`.
6486 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6487 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6488 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6489 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6490 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6491 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6492 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6493 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6494 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6495 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6496 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6497 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6498 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6499 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6500 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6501 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6502 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6503 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6504 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6505 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6506 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6507 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6508 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6509 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6510 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6511 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6512 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6513 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6514 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6515 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6516 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6517 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6518 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6519 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6520 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6521 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6522 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6523 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6524 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6525 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6526 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6527 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6528 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6529 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6530 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6531 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6532 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6533 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6534 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6535 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6536 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6537 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6538 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6539 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6540 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6541 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6542 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6543 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6544 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6545 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6548 Version 1.7.0 (2016-03-03)
6549 ==========================
6556 * [`Path::strip_prefix`] (renamed from relative_from)
6557 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6559 * [`Ipv4Addr::is_loopback`]
6560 * [`Ipv4Addr::is_private`]
6561 * [`Ipv4Addr::is_link_local`]
6562 * [`Ipv4Addr::is_multicast`]
6563 * [`Ipv4Addr::is_broadcast`]
6564 * [`Ipv4Addr::is_documentation`]
6566 * [`Ipv6Addr::is_unspecified`]
6567 * [`Ipv6Addr::is_loopback`]
6568 * [`Ipv6Addr::is_multicast`]
6571 * [`Vec::as_mut_slice`]
6573 * [`String::as_str`]
6574 * [`String::as_mut_str`]
6576 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6578 * `<[T]>::`[`sort_by_key`]
6579 * checked, saturated, and overflowing operations
6580 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6581 * [`i32::saturating_mul`]
6582 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6583 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6584 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6585 * [`u32::saturating_mul`]
6586 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6587 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6588 * and checked, saturated, and overflowing operations for other primitive types
6590 * [`ffi::IntoStringError`]
6591 * [`CString::into_string`]
6592 * [`CString::into_bytes`]
6593 * [`CString::into_bytes_with_nul`]
6594 * `From<CString> for Vec<u8>`
6596 * [`IntoStringError::into_cstring`]
6597 * [`IntoStringError::utf8_error`]
6598 * `Error for IntoStringError`
6600 * [`std::hash::BuildHasher`]
6601 * [`BuildHasher::Hasher`]
6602 * [`BuildHasher::build_hasher`]
6603 * [`std::hash::BuildHasherDefault`]
6604 * [`HashMap::with_hasher`]
6605 * [`HashMap::with_capacity_and_hasher`]
6606 * [`HashSet::with_hasher`]
6607 * [`HashSet::with_capacity_and_hasher`]
6608 * [`std::collections::hash_map::RandomState`]
6609 * [`RandomState::new`]
6610 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6611 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6612 from bytes is faster.
6613 * [The performance of `LineWriter` (and thus `io::stdout`) was
6614 improved by using `memchr` to search for newlines][1.7m].
6615 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6616 `f64` variants were stabilized previously.
6617 * [`BTreeMap` was rewritten to use less memory and improve the performance
6618 of insertion and iteration, the latter by as much as 5x][1.7bm].
6619 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6620 covariant over their contained type][1.7bt].
6621 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6622 over their contained type][1.7ll].
6623 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6625 * [`Any` is implemented for unsized types][1.7a].
6626 * [`Hash` is implemented for `Duration`][1.7h].
6631 * [When running tests with `--test`, rustdoc will pass `--cfg`
6632 arguments to the compiler][1.7dt].
6633 * [The compiler is built with RPATH information by default][1.7rpa].
6634 This means that it will be possible to run `rustc` when installed in
6635 unusual configurations without configuring the dynamic linker search
6637 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6638 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6639 over `LD_LIBRARY_PATH`.
6644 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6645 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6646 * [The `rerun-if-changed` build script directive no longer causes the
6647 build script to incorrectly run twice in certain scenarios][1.7rr].
6652 * Soundness fixes to the interactions between associated types and
6653 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6654 code that violates the new rules. This is a significant change that
6655 is known to break existing code, so it has emitted warnings for the
6656 new error cases since 1.4 to give crate authors time to adapt. The
6657 details of what is changing are subtle; read the RFC for more.
6658 * [Several bugs in the compiler's visibility calculations were
6659 fixed][1.7v]. Since this was found to break significant amounts of
6660 code, the new errors will be emitted as warnings for several release
6661 cycles, under the `private_in_public` lint.
6662 * Defaulted type parameters were accidentally accepted in positions
6663 that were not intended. In this release, [defaulted type parameters
6664 appearing outside of type definitions will generate a
6665 warning][1.7d], which will become an error in future releases.
6666 * [Parsing "." as a float results in an error instead of 0][1.7p].
6667 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6668 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6670 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6671 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6672 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6673 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6674 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6675 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6676 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6677 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6678 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6679 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6680 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6681 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6682 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6683 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6684 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6685 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6686 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6687 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6688 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6689 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6690 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6691 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6692 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6693 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6694 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6695 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6696 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6697 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6698 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6699 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6700 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6701 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6702 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6703 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6704 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6705 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6706 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6707 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6708 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6709 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6710 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6711 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6712 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6713 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6714 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6715 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6716 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6717 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6718 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6719 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6720 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6721 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6722 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6723 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6724 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6725 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6726 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6727 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6728 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6729 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6730 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6731 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6732 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6733 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6734 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6735 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6736 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6737 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6738 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6739 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6740 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6741 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6742 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6743 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6744 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6745 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6746 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6747 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6748 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6751 Version 1.6.0 (2016-01-21)
6752 ==========================
6757 * The `#![no_std]` attribute causes a crate to not be linked to the
6758 standard library, but only the [core library][1.6co], as described
6759 in [RFC 1184]. The core library defines common types and traits but
6760 has no platform dependencies whatsoever, and is the basis for Rust
6761 software in environments that cannot support a full port of the
6762 standard library, such as operating systems. Most of the core
6763 library is now stable.
6769 [`Read::read_exact`],
6770 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6771 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6772 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6773 [`os::unix::fs::DirBuilderExt`],
6774 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6775 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6776 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6777 [`collections::hash_map::Drain`],
6778 [`collections::hash_map::HashMap::drain`],
6779 [`collections::hash_set::Drain`],
6780 [`collections::hash_set::HashSet::drain`],
6781 [`collections::binary_heap::Drain`],
6782 [`collections::binary_heap::BinaryHeap::drain`],
6783 [`Vec::extend_from_slice`] (renamed from `push_all`),
6784 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6785 [`RwLock::into_inner`],
6786 [`Iterator::min_by_key`] (renamed from `min_by`),
6787 [`Iterator::max_by_key`] (renamed from `max_by`).
6788 * The [core library][1.6co] is stable, as are most of its APIs.
6789 * [The `assert_eq!` macro supports arguments that don't implement
6790 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6792 * Several timer functions that take duration in milliseconds [are
6793 deprecated in favor of those that take `Duration`][1.6ms]. These
6794 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6795 `thread::park_timeout_ms`.
6796 * The algorithm by which `Vec` reserves additional elements was
6797 [tweaked to not allocate excessive space][1.6a] while still growing
6799 * `From` conversions are [implemented from integers to floats][1.6f]
6800 in cases where the conversion is lossless. Thus they are not
6801 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6802 or `f64`. They are also not implemented for `isize` and `usize`
6803 because the implementations would be platform-specific. `From` is
6804 also implemented from `f32` to `f64`.
6805 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6806 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6807 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6808 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6810 * Sorting slices that are already sorted [is 50% faster in some
6816 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6817 * Cargo build scripts can specify their dependencies by emitting the
6818 [`rerun-if-changed`][1.6rr] key.
6819 * crates.io will reject publication of crates with dependencies that
6820 have a wildcard version constraint. Crates with wildcard
6821 dependencies were seen to cause a variety of problems, as described
6822 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6824 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6825 release folder. A variety of artifacts that Cargo failed to clean
6826 are now correctly deleted.
6831 * The `unreachable_code` lint [warns when a function call's argument
6833 * The parser indicates [failures that may be caused by
6834 confusingly-similar Unicode characters][1.6uc]
6835 * Certain macro errors [are reported at definition time][1.6m], not
6841 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6842 environment variable when locating crates. This was a pre-cargo
6843 feature for integrating with the package manager that was
6844 accidentally never removed.
6845 * [A number of bugs were fixed in the privacy checker][1.6p] that
6846 could cause previously-accepted code to break.
6847 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6848 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6849 struct pattern syntax (`Foo(..)`) can no longer be used to match
6850 unit structs. This is a warning now, but will become an error in
6851 future releases. Patterns that share the same name as a const are
6853 * A bug was fixed that causes [rustc not to apply default type
6854 parameters][1.6xc] when resolving certain method implementations of
6855 traits defined in other crates.
6857 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6858 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6859 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6860 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6861 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6862 [1.6co]: http://doc.rust-lang.org/core/index.html
6863 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6864 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6865 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6866 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6867 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6868 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6869 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6870 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6871 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6872 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6873 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6874 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6875 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6876 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6877 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6878 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6879 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6880 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6881 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6882 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6883 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6884 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6885 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6886 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6887 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6888 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6889 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6890 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6891 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6892 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6893 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6894 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6895 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6896 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6897 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6898 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6899 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6900 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6901 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6902 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6903 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6906 Version 1.5.0 (2015-12-10)
6907 ==========================
6909 * ~700 changes, numerous bugfixes
6915 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6916 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6917 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6918 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6919 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6920 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6921 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6922 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6923 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6924 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6925 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6926 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6927 [`Path::read_link`], [`Path::symlink_metadata`],
6928 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6929 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6930 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6931 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6932 [`slice::split_first_mut`], [`slice::split_first`],
6933 [`slice::split_last_mut`], [`slice::split_last`],
6934 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6935 [`str::MatchIndices`], [`str::RMatchIndices`],
6936 [`str::match_indices`], [`str::rmatch_indices`],
6937 [`str::slice_mut_unchecked`], [`string::ParseError`].
6938 * Rust applications hosted on crates.io can be installed locally to
6939 `~/.cargo/bin` with the [`cargo install`] command. Among other
6940 things this makes it easier to augment Cargo with new subcommands:
6941 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6942 invoked as `cargo foo`.
6943 * Crates with wildcard (`*`) dependencies will [emit warnings when
6944 published][1.5w]. In 1.6 it will no longer be possible to publish
6945 crates with wildcard dependencies.
6950 * The rules determining when a particular lifetime must outlive
6951 a particular value (known as '[dropck]') have been [modified
6952 to not rely on parametricity][1.5p].
6953 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6954 and `Arc`][1.5a]. Because these smart pointer types implement
6955 `Deref`, this causes breakage in cases where the interior type
6956 contains methods of the same name.
6957 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6958 that they could drop their content. Soundness fix.
6959 * All method invocations are [properly checked][1.5wf1] for
6960 [well-formedness][1.5wf2]. Soundness fix.
6961 * Traits whose supertraits contain `Self` are [not object
6962 safe][1.5o]. Soundness fix.
6963 * Target specifications support a [`no_default_libraries`][1.5nd]
6964 setting that controls whether `-nodefaultlibs` is passed to the
6965 linker, and in turn the `is_like_windows` setting no longer affects
6966 the `-nodefaultlibs` flag.
6967 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6968 * The `#[inline]` and `#[repr]` attributes [can only appear
6969 in valid locations][1.5at].
6970 * Native libraries linked from the local crate are [passed to
6971 the linker before native libraries from upstream crates][1.5nl].
6972 * Two rarely-used attributes, `#[no_debug]` and
6973 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6974 * Negation of unsigned integers, which has been a warning for
6975 several releases, [is now behind a feature gate and will
6976 generate errors][1.5nu].
6977 * The parser accidentally accepted visibility modifiers on
6978 enum variants, a bug [which has been fixed][1.5ev].
6979 * [A bug was fixed that allowed `use` statements to import unstable
6985 * When evaluating expressions at compile-time that are not
6986 compile-time constants (const-evaluating expressions in non-const
6987 contexts), incorrect code such as overlong bitshifts and arithmetic
6988 overflow will [generate a warning instead of an error][1.5ce],
6989 delaying the error until runtime. This will allow the
6990 const-evaluator to be expanded in the future backwards-compatibly.
6991 * The `improper_ctypes` lint [no longer warns about using `isize` and
6992 `usize` in FFI][1.5ict].
6997 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6999 * `Default` is [implemented for mutable slices][1.5d].
7000 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7001 * There are now `From` conversions [between floating point
7002 types][1.5f] where the conversions are lossless.
7003 * There are now `From` conversions [between integer types][1.5i] where
7004 the conversions are lossless.
7005 * [`fs::Metadata` implements `Clone`][1.5fs].
7006 * The `parse` method [accepts a leading "+" when parsing
7008 * [`AsMut` is implemented for `Vec`][1.5am].
7009 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7010 been optimized][1.5cf] and no longer rely on the default impl.
7011 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7012 `unsafe extern "C"` function types now [implement `Clone`,
7013 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7014 `fmt::Debug` for up to 12 arguments][1.5fp].
7015 * [Dropping `Vec`s is much faster in unoptimized builds when the
7016 element types don't implement `Drop`][1.5dv].
7017 * A bug that caused in incorrect behavior when [combining `VecDeque`
7018 with zero-sized types][1.5vdz] was resolved.
7019 * [`PartialOrd` for slices is faster][1.5po].
7024 * [Crate metadata size was reduced by 20%][1.5md].
7025 * [Improvements to code generation reduced the size of libcore by 3.3
7026 MB and rustc's memory usage by 18MB][1.5m].
7027 * [Improvements to deref translation increased performance in
7028 unoptimized builds][1.5dr].
7029 * Various errors in trait resolution [are deduplicated to only be
7030 reported once][1.5te].
7031 * Rust has preliminary [support for rumprun kernels][1.5rr].
7032 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7034 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7035 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7036 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7037 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7038 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7039 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7040 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7041 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7042 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7043 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7044 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7045 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7046 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7047 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7048 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7049 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7050 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7051 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7052 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7053 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7054 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7055 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7056 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7057 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7058 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7059 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7060 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7061 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7062 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7063 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7064 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7065 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7066 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7067 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7068 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7069 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7070 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7071 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7072 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7073 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7074 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7075 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7076 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7077 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7078 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7079 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7080 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7081 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7082 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7083 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7084 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7085 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7086 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7087 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7088 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7089 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7090 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7091 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7092 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7093 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7094 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7095 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7096 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7097 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7098 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7099 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7100 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7101 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7102 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7103 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7104 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7105 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7106 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7107 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7108 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7109 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7110 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7111 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7112 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7113 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7114 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7115 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7116 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7117 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7118 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7119 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7120 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7121 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7122 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7124 Version 1.4.0 (2015-10-29)
7125 ==========================
7127 * ~1200 changes, numerous bugfixes
7132 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7133 GNU) are now supported and recommended for use.
7138 * [Several changes have been made to fix type soundness and improve
7139 the behavior of associated types][sound]. See [RFC 1214]. Although
7140 we have mostly introduced these changes as warnings this release, to
7141 become errors next release, there are still some scenarios that will
7142 see immediate breakage.
7143 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7144 line breaks in addition to `\n`][crlf].
7145 * [Loans of `'static` lifetime extend to the end of a function][stat].
7146 * [`str::parse` no longer introduces avoidable rounding error when
7147 parsing floating point numbers. Together with earlier changes to
7148 float formatting/output, "round trips" like f.to_string().parse()
7149 now preserve the value of f exactly. Additionally, leading plus
7150 signs are now accepted][fp3].
7156 * `use` statements that import multiple items [can now rename
7157 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7158 * [Binops work correctly on fat pointers][binfat].
7159 * `pub extern crate`, which does not behave as expected, [issues a
7160 warning][pec] until a better solution is found.
7165 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7166 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7167 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7168 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7169 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7170 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7171 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7172 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7173 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7174 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7175 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7176 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7177 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7178 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7179 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7180 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7181 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7182 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7184 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7185 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7186 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7187 `f64::from_str_radix`.
7188 * [Reverse-searching strings is faster with the 'two-way'
7190 * [`std::io::copy` allows `?Sized` arguments][cc].
7191 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7192 [override `count`, `nth` and `last` with an O(1)
7193 implementation][it].
7194 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7195 * [`IntoRawFd` has been added to the Unix-specific prelude,
7196 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7198 * [`Extend<String>` and `FromIterator<String` are both implemented for
7200 * [`IntoIterator` is implemented for references to `Option` and
7202 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7203 Copy`][ext] as part of [RFC 839]. This will cause type inference
7204 breakage in rare situations.
7205 * [`BinaryHeap` implements `Debug`][bh2].
7206 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7208 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7209 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7210 * [String comparison is faster][faststr].
7211 * `&mut T` where `T: std::fmt::Write` [also implements
7212 `std::fmt::Write`][mutw].
7213 * [A stable regression in `VecDeque::push_back` and other
7214 capacity-altering methods that caused panics for zero-sized types
7216 * [Function pointers implement traits for up to 12 parameters][fp2].
7221 * The compiler [no longer uses the 'morestack' feature to prevent
7222 stack overflow][mm]. Instead it uses guard pages and stack
7223 probes (though stack probes are not yet implemented on any platform
7225 * [The compiler matches traits faster when projections are involved][p].
7226 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7228 * [Cargo now displays useful information about what its doing during
7229 `cargo update`][cu].
7231 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7232 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7233 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7234 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7235 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7236 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7237 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7238 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7239 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7240 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7241 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7242 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7243 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7244 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7245 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7246 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7247 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7248 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7249 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7250 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7251 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7252 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7253 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7254 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7255 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7256 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7257 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7258 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7259 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7260 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7261 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7262 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7263 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7264 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7265 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7266 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7267 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7268 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7269 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7270 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7271 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7272 [bh2]: https://github.com/rust-lang/rust/pull/28156
7273 [binfat]: https://github.com/rust-lang/rust/pull/28270
7274 [bm]: https://github.com/rust-lang/rust/pull/28197
7275 [cc]: https://github.com/rust-lang/rust/pull/27531
7276 [crlf]: https://github.com/rust-lang/rust/pull/28034
7277 [cu]: https://github.com/rust-lang/cargo/pull/1931
7278 [d]: https://github.com/rust-lang/rust/pull/27825
7279 [dep]: https://github.com/rust-lang/rust/pull/28339
7280 [es]: https://github.com/rust-lang/rust/pull/27956
7281 [ext]: https://github.com/rust-lang/rust/pull/28094
7282 [faststr]: https://github.com/rust-lang/rust/pull/28338
7283 [ffi]: https://github.com/rust-lang/rust/pull/28779
7284 [fp]: https://github.com/rust-lang/rust/pull/28268
7285 [fp2]: https://github.com/rust-lang/rust/pull/28560
7286 [fp3]: https://github.com/rust-lang/rust/pull/27307
7287 [i]: https://github.com/rust-lang/rust/pull/27451
7288 [into2]: https://github.com/rust-lang/rust/pull/28039
7289 [it]: https://github.com/rust-lang/rust/pull/27652
7290 [mm]: https://github.com/rust-lang/rust/pull/27338
7291 [mutw]: https://github.com/rust-lang/rust/pull/28368
7292 [sound]: https://github.com/rust-lang/rust/pull/27641
7293 [p]: https://github.com/rust-lang/rust/pull/27866
7294 [pec]: https://github.com/rust-lang/rust/pull/28486
7295 [pr]: https://github.com/rust-lang/rust/pull/27896
7296 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7297 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7298 [s]: https://github.com/rust-lang/rust/pull/27474
7299 [stab]: https://github.com/rust-lang/rust/pull/28339
7300 [stat]: https://github.com/rust-lang/rust/pull/28321
7301 [vd]: https://github.com/rust-lang/rust/pull/28494
7303 Version 1.3.0 (2015-09-17)
7304 ==============================
7306 * ~900 changes, numerous bugfixes
7311 * The [new object lifetime defaults][nold] have been [turned
7312 on][nold2] after a cycle of warnings about the change. Now types
7313 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7314 being interpreted as `&'a Box<Trait+'a>` to `&'a
7315 Box<Trait+'static>`.
7316 * [The Rustonomicon][nom] is a new book in the official documentation
7317 that dives into writing unsafe Rust.
7318 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7319 timekeeping is employed by other std APIs, as well as out-of-tree
7325 * The [new object lifetime defaults][nold] have been [turned
7326 on][nold2] after a cycle of warnings about the change.
7327 * There is a known [regression][lr] in how object lifetime elision is
7328 interpreted, the proper solution for which is undetermined.
7329 * The `#[prelude_import]` attribute, an internal implementation
7330 detail, was accidentally stabilized previously. [It has been put
7331 behind the `prelude_import` feature gate][pi]. This change is
7332 believed to break no existing code.
7333 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7334 [more sane for dynamically sized types][dst3]. Code that relied on
7335 the previous behavior is thought to be broken.
7336 * The `dropck` rules, which checks that destructors can't access
7337 destroyed values, [have been updated][dropck] to match the
7338 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7339 cause some previously-compiling code to no longer build.
7344 * The [new object lifetime defaults][nold] have been [turned
7345 on][nold2] after a cycle of warnings about the change.
7346 * Semicolons may [now follow types and paths in
7347 macros](https://github.com/rust-lang/rust/pull/27000).
7348 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7349 [more sane for dynamically sized types][dst3]. Code that relied on
7350 the previous behavior is not known to exist, and suspected to be
7352 * `'static` variables [may now be recursive][st].
7353 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7354 implementations correctly.
7355 * The `dropck` rules, which checks that destructors can't access
7356 destroyed values, [have been updated][dropck] to match the
7362 * The [`Duration`] API, [has been stabilized][ds], as well as the
7363 `std::time` module, which presently contains only `Duration`.
7364 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7365 * The owned C string, [`CString`], implements [`Borrow`] and the
7366 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7367 these allow C strings to be borrowed and cloned in generic code.
7368 * [`CStr`] implements [`Debug`].
7369 * [`AtomicPtr`] implements [`Debug`].
7370 * [`Error`] trait objects [can be downcast to their concrete types][e]
7371 in many common configurations, using the [`is`], [`downcast`],
7372 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7374 * Searching for substrings now [employs the two-way algorithm][search]
7375 instead of doing a naive search. This gives major speedups to a
7376 number of methods, including [`contains`][sc], [`find`][sf],
7377 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7378 [`ends_with`][sew] are also faster.
7379 * The performance of `PartialEq` for slices is [much faster][ps].
7380 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7381 is overridden and optimized by the implementations for scalars.
7382 * The [`Hasher`] trait now has a number of specialized `write_*`
7383 methods for primitive types, for efficiency.
7384 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7385 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7386 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7387 of [`std::error::Error::cause`][iec] also delegates to the inner
7389 * [`process::Child`][pc] gained the [`id`] method, which returns a
7390 `u32` representing the platform-specific process identifier.
7391 * The [`connect`] method on slices is deprecated, replaced by the new
7392 [`join`] method (note that both of these are on the *unstable*
7393 [`SliceConcatExt`] trait, but through the magic of the prelude are
7394 available to stable code anyway).
7395 * The [`Div`] operator is implemented for [`Wrapping`] types.
7396 * [`DerefMut` is implemented for `String`][dms].
7397 * Performance of SipHash (the default hasher for `HashMap`) is
7398 [better for long data][sh].
7399 * [`AtomicPtr`] implements [`Send`].
7400 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7401 are now [specialized to use uninitialized buffers for increased
7403 * Lifetime parameters of foreign functions [are now resolved
7409 * Rust can now, with some coercion, [produce programs that run on
7410 Windows XP][xp], though XP is not considered a supported platform.
7411 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7412 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7413 recommended for use in 1.3, though should be fully-functional
7414 in the [64-bit 1.4 beta][b14].
7415 * On Fedora-based systems installation will [properly configure the
7416 dynamic linker][fl].
7417 * The compiler gained many new extended error descriptions, which can
7418 be accessed with the `--explain` flag.
7419 * The `dropck` pass, which checks that destructors can't access
7420 destroyed values, [has been rewritten][dropck]. This fixes some
7421 soundness holes, and as such will cause some previously-compiling
7422 code to no longer build.
7423 * `rustc` now uses [LLVM to write archive files where possible][ar].
7424 Eventually this will eliminate the compiler's dependency on the ar
7426 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7427 supported FreeBSD on x86_64).
7428 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7429 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7431 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7432 will kill the process instead of leaking][nlp].
7434 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7435 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7436 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7437 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7438 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7439 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7440 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7441 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7442 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7443 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7444 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7445 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7446 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7447 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7448 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7449 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7450 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7451 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7452 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7453 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7454 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7455 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7456 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7457 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7458 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7459 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7460 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7461 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7462 [ar]: https://github.com/rust-lang/rust/pull/26926
7463 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7464 [dms]: https://github.com/rust-lang/rust/pull/26241
7465 [dropck]: https://github.com/rust-lang/rust/pull/27261
7466 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7467 [ds]: https://github.com/rust-lang/rust/pull/26818
7468 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7469 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7470 [dst3]: https://github.com/rust-lang/rust/pull/27351
7471 [e]: https://github.com/rust-lang/rust/pull/24793
7472 [f]: https://github.com/rust-lang/rust/pull/26588
7473 [fb]: https://github.com/rust-lang/rust/pull/26959
7474 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7475 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7476 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7477 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7478 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7479 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7480 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7481 [lic]: https://github.com/rust-lang/rust/pull/26583
7482 [lnu]: https://github.com/rust-lang/rust/pull/27026
7483 [lr]: https://github.com/rust-lang/rust/issues/27248
7484 [lum]: https://github.com/rust-lang/rust/pull/26378
7485 [lur]: https://github.com/rust-lang/rust/pull/26783
7486 [nlp]: https://github.com/rust-lang/rust/pull/27176
7487 [nold2]: https://github.com/rust-lang/rust/pull/27045
7488 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7489 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7490 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7491 [pi]: https://github.com/rust-lang/rust/pull/26699
7492 [ps]: https://github.com/rust-lang/rust/pull/26884
7493 [rte]: https://github.com/rust-lang/rust/pull/26950
7494 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7495 [search]: https://github.com/rust-lang/rust/pull/26327
7496 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7497 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7498 [sh]: https://github.com/rust-lang/rust/pull/27280
7499 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7500 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7501 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7502 [st]: https://github.com/rust-lang/rust/pull/26630
7503 [win1]: https://github.com/rust-lang/rust/pull/26569
7504 [win2]: https://github.com/rust-lang/rust/pull/26741
7505 [win3]: https://github.com/rust-lang/rust/pull/26741
7506 [win4]: https://github.com/rust-lang/rust/pull/27210
7507 [xp]: https://github.com/rust-lang/rust/pull/26569
7509 Version 1.2.0 (2015-08-07)
7510 ==========================
7512 * ~1200 changes, numerous bugfixes
7517 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7518 like `Rc` to contain types without a fixed size, arrays and trait
7519 objects, finally enabling use of `Rc<[T]>` and completing the
7520 implementation of DST.
7521 * [Parallel codegen][parcodegen] is now working again, which can
7522 substantially speed up large builds in debug mode; It also gets
7523 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7524 jobs). It's not enabled by default, but will be "in the near
7525 future". It can be activated with the `-C codegen-units=N` flag to
7527 * This is the first release with [experimental support for linking
7528 with the MSVC linker and lib C on Windows (instead of using the GNU
7529 variants via MinGW)][win]. It is yet recommended only for the most
7530 intrepid Rustaceans.
7531 * Benchmark compilations are showing a 30% improvement in
7532 bootstrapping over 1.1.
7537 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7538 unicode case mapping, which is a previously-planned change in
7539 behavior and considered a bugfix.
7540 * [`mem::align_of`] now specifies [the *minimum alignment* for
7541 T][align], which is usually the alignment programs are interested
7542 in, and the same value reported by clang's
7543 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7545 * [The `#[packed]` attribute is no longer silently accepted by the
7546 compiler][packed]. This attribute did nothing and code that
7547 mentioned it likely did not work as intended.
7548 * Associated type defaults are [now behind the
7549 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7550 defaults *did not work*, but could be mentioned syntactically. As
7551 such this breakage has minimal impact.
7556 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7557 matching against dereferenceable values.
7562 * The [`Extend`] trait, which grows a collection from an iterator, is
7563 implemented over iterators of references, for `String`, `Vec`,
7564 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7565 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7566 * The [`iter::once`] function returns an iterator that yields a single
7567 element, and [`iter::empty`] returns an iterator that yields no
7569 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7570 over substring matches.
7571 * [`Cell`] and [`RefCell`] both implement `Eq`.
7572 * A number of methods for wrapping arithmetic are added to the
7573 integral types, [`wrapping_div`], [`wrapping_rem`],
7574 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7575 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7576 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7577 type.. It is illegal for the default arithmetic operations in Rust
7578 to overflow; the desire to wrap must be explicit.
7579 * The `{:#?}` formatting specifier [displays the alternate,
7580 pretty-printed][debugfmt] form of the `Debug` formatter. This
7581 feature was actually introduced prior to 1.0 with little
7583 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7584 for writing data to formatted strings, similar to [`io::Write`].
7585 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7586 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7587 are used by code generators to emit implementations of [`Debug`].
7588 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7589 methods that convert case, following Unicode case mapping.
7590 * It is now easier to handle poisoned locks. The [`PoisonError`]
7591 type, returned by failing lock operations, exposes `into_inner`,
7592 `get_ref`, and `get_mut`, which all give access to the inner lock
7593 guard, and allow the poisoned lock to continue to operate. The
7594 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7595 poisoned lock without attempting to take the lock.
7596 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7597 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7598 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7599 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7601 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7607 * `rustc` employs smarter heuristics for guessing at [typos].
7608 * `rustc` emits more efficient code for [no-op conversions between
7609 unsafe pointers][nop].
7610 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7611 resulting in faster compile times and smaller code.
7613 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7614 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7615 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7616 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7617 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7618 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7619 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7620 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7621 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7622 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7623 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7624 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7625 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7626 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7627 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7628 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7629 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7630 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7631 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7632 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7633 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7634 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7635 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7636 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7637 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7638 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7639 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7640 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7641 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7642 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7643 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7644 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7645 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7646 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7647 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7648 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7649 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7650 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7651 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7652 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7653 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7654 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7655 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7656 [align]: https://github.com/rust-lang/rust/pull/25646
7657 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7658 [typos]: https://github.com/rust-lang/rust/pull/26087
7659 [nop]: https://github.com/rust-lang/rust/pull/26336
7660 [fat]: https://github.com/rust-lang/rust/pull/26411
7661 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7662 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7663 [packed]: https://github.com/rust-lang/rust/pull/25541
7664 [ad]: https://github.com/rust-lang/rust/pull/27382
7665 [win]: https://github.com/rust-lang/rust/pull/25350
7667 Version 1.1.0 (2015-06-25)
7668 =========================
7670 * ~850 changes, numerous bugfixes
7675 * The [`std::fs` module has been expanded][fs] to expand the set of
7676 functionality exposed:
7677 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7678 don't incur a syscall on some platforms.
7679 * A `symlink_metadata` function has been added.
7680 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7681 access to all underlying information.
7682 * The compiler now contains extended explanations of many errors. When an error
7683 with an explanation occurs the compiler suggests using the `--explain` flag
7684 to read the explanation. Error explanations are also [available online][err-index].
7685 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7686 well as other work, the time to bootstrap the compiler decreased by
7692 * The [`str::split_whitespace`] method splits a string on unicode
7693 whitespace boundaries.
7694 * On both Windows and Unix, new extension traits provide conversion of
7695 I/O types to and from the underlying system handles. On Unix, these
7696 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7697 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7698 `TcpListener`, and `UpdSocket`. Further implementations for
7699 `std::process` will be stabilized later.
7700 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7701 Windows, symlinks can be created with
7702 `std::os::windows::symlink_dir` and
7703 `std::os::windows::symlink_file`.
7704 * The `mpsc::Receiver` type can now be converted into an iterator with
7705 `into_iter` on the [`IntoIterator`] trait.
7706 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7707 implementation of the [`From`] trait.
7708 * The `Debug` implementation for `RangeFull` [creates output that is
7709 more consistent with other implementations][rf].
7710 * [`Debug` is implemented for `File`][file].
7711 * The `Default` implementation for `Arc` [no longer requires `Sync +
7713 * [The `Iterator` methods `count`, `nth`, and `last` have been
7714 overridden for slices to have O(1) performance instead of O(n)][si].
7715 * Incorrect handling of paths on Windows has been improved in both the
7716 compiler and the standard library.
7717 * [`AtomicPtr` gained a `Default` implementation][ap].
7718 * In accordance with Rust's policy on arithmetic overflow `abs` now
7719 [panics on overflow when debug assertions are enabled][abs].
7720 * The [`Cloned`] iterator, which was accidentally left unstable for
7721 1.0 [has been stabilized][c].
7722 * The [`Incoming`] iterator, which iterates over incoming TCP
7723 connections, and which was accidentally unnamable in 1.0, [is now
7724 properly exported][inc].
7725 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7726 `sift_up` or `sift_down` panic][bh].
7727 * The [`split_off`] method of `LinkedList` [no longer corrupts
7728 the list in certain scenarios][ll].
7733 * Type checking performance [has improved notably][sk] with
7734 [multiple improvements][pre].
7735 * The compiler [suggests code changes][ch] for more errors.
7736 * rustc and it's build system have experimental support for [building
7737 toolchains against MUSL][m] instead of glibc on Linux.
7738 * The compiler defines the `target_env` cfg value, which is used for
7739 distinguishing toolchains that are otherwise for the same
7740 platform. Presently this is set to `gnu` for common GNU Linux
7741 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7742 * The [`cargo rustc`][crc] command invokes a build with custom flags
7744 * [Android executables are always position independent][pie].
7745 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7748 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7749 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7750 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7751 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7752 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7753 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7754 [rf]: https://github.com/rust-lang/rust/pull/24491
7755 [err-index]: https://doc.rust-lang.org/error-index.html
7756 [sk]: https://github.com/rust-lang/rust/pull/24615
7757 [pre]: https://github.com/rust-lang/rust/pull/25323
7758 [file]: https://github.com/rust-lang/rust/pull/24598
7759 [ch]: https://github.com/rust-lang/rust/pull/24683
7760 [arc]: https://github.com/rust-lang/rust/pull/24695
7761 [si]: https://github.com/rust-lang/rust/pull/24701
7762 [ap]: https://github.com/rust-lang/rust/pull/24834
7763 [m]: https://github.com/rust-lang/rust/pull/24777
7764 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7765 [crc]: https://github.com/rust-lang/cargo/pull/1568
7766 [pie]: https://github.com/rust-lang/rust/pull/24953
7767 [abs]: https://github.com/rust-lang/rust/pull/25441
7768 [c]: https://github.com/rust-lang/rust/pull/25496
7769 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7770 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7771 [inc]: https://github.com/rust-lang/rust/pull/25522
7772 [bh]: https://github.com/rust-lang/rust/pull/25856
7773 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7774 [ll]: https://github.com/rust-lang/rust/pull/26022
7775 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7776 [drop]: https://github.com/rust-lang/rust/pull/24935
7778 Version 1.0.0 (2015-05-15)
7779 ========================
7781 * ~1500 changes, numerous bugfixes
7786 * The vast majority of the standard library is now `#[stable]`. It is
7787 no longer possible to use unstable features with a stable build of
7789 * Many popular crates on [crates.io] now work on the stable release
7791 * Arithmetic on basic integer types now [checks for overflow in debug
7797 * Several [restrictions have been added to trait coherence][coh] in
7798 order to make it easier for upstream authors to change traits
7799 without breaking downstream code.
7800 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7801 improve error messages and macro behavior. For example, `0b1234` is
7802 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7803 * Trait bounds [are always invariant][inv], eliminating the need for
7804 the `PhantomFn` and `MarkerTrait` lang items, which have been
7806 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7807 "foo" as bar` syntax has been replaced with `extern crate foo as
7808 bar`, and Cargo now automatically translates "-" in *package* names
7809 to underscore for the crate name.
7810 * [Lifetime shadowing is an error][lt].
7811 * [`Send` no longer implies `'static`][send-rfc].
7812 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7813 `MyType::default()`.
7814 * Primitive types [now have inherent methods][prim-inherent],
7815 obviating the need for extension traits like `SliceExt`.
7816 * Methods with `Self: Sized` in their `where` clause are [considered
7817 object-safe][self-sized], allowing many extension traits like
7818 `IteratorExt` to be merged into the traits they extended.
7819 * You can now [refer to associated types][assoc-where] whose
7820 corresponding trait bounds appear only in a `where` clause.
7821 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7822 like `Send` and `Sync` are now library-defined.
7823 * A [Reflect trait][reflect] was introduced, which means that
7824 downcasting via the `Any` trait is effectively limited to concrete
7825 types. This helps retain the potentially-important "parametricity"
7826 property: generic code cannot behave differently for different type
7827 arguments except in minor ways.
7828 * The `unsafe_destructor` feature is now deprecated in favor of the
7829 [new `dropck`][dropck]. This change is a major reduction in unsafe
7835 * The `thread_local` module [has been renamed to `std::thread`][th].
7836 * The methods of `IteratorExt` [have been moved to the `Iterator`
7838 * Several traits that implement Rust's conventions for type
7839 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7840 [centralized in the `std::convert` module][con].
7841 * The `FromError` trait [was removed in favor of `From`][fe].
7842 * The basic sleep function [has moved to
7843 `std::thread::sleep_ms`][slp].
7844 * The `splitn` function now takes an `n` parameter that represents the
7845 number of items yielded by the returned iterator [instead of the
7846 number of 'splits'][spl].
7847 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7848 * [Derived implementations of `PartialOrd` now order enums according
7849 to their explicitly-assigned discriminants][po].
7850 * [Methods for searching strings are generic over `Pattern`s][pat],
7851 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7853 * [In method resolution, object methods are resolved before inherent
7855 * [`String::from_str` has been deprecated in favor of the `From` impl,
7856 `String::from`][sf].
7857 * [`io::Error` implements `Sync`][ios].
7858 * [The `words` method on `&str` has been replaced with
7859 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7861 * The new path and IO modules are complete and `#[stable]`. This
7862 was the major library focus for this cycle.
7863 * The path API was [revised][path-normalize] to normalize `.`,
7864 adjusting the tradeoffs in favor of the most common usage.
7865 * A large number of remaining APIs in `std` were also stabilized
7866 during this cycle; about 75% of the non-deprecated API surface
7868 * The new [string pattern API][string-pattern] landed, which makes
7869 the string slice API much more internally consistent and flexible.
7870 * A new set of [generic conversion traits][conversion] replaced
7871 many existing ad hoc traits.
7872 * Generic numeric traits were [completely removed][num-traits]. This
7873 was made possible thanks to inherent methods for primitive types,
7874 and the removal gives maximal flexibility for designing a numeric
7875 hierarchy in the future.
7876 * The `Fn` traits are now related via [inheritance][fn-inherit]
7877 and provide ergonomic [blanket implementations][fn-blanket].
7878 * The `Index` and `IndexMut` traits were changed to
7879 [take the index by value][index-value], enabling code like
7880 `hash_map["string"]` to work.
7881 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7882 `Copy` data is known to be `Clone` as well.
7887 * Many errors now have extended explanations that can be accessed with
7888 the `--explain` flag to `rustc`.
7889 * Many new examples have been added to the standard library
7891 * rustdoc has received a number of improvements focused on completion
7893 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7894 * Much headway was made on ecosystem-wide CI, making it possible
7895 to [compare builds for breakage][ci-compare].
7898 [crates.io]: http://crates.io
7899 [clo]: https://github.com/rust-lang/rust/pull/24034
7900 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7901 [con]: https://github.com/rust-lang/rust/pull/23875
7902 [cr]: https://github.com/rust-lang/rust/pull/23419
7903 [fe]: https://github.com/rust-lang/rust/pull/23879
7904 [ie]: https://github.com/rust-lang/rust/pull/23300
7905 [inv]: https://github.com/rust-lang/rust/pull/23938
7906 [ios]: https://github.com/rust-lang/rust/pull/24133
7907 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7908 [lt]: https://github.com/rust-lang/rust/pull/24057
7909 [meth]: https://github.com/rust-lang/rust/pull/24056
7910 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7911 [po]: https://github.com/rust-lang/rust/pull/24270
7912 [sf]: https://github.com/rust-lang/rust/pull/24517
7913 [slp]: https://github.com/rust-lang/rust/pull/23949
7914 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7915 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7916 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7917 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7918 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7919 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7920 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7921 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7922 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7923 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7924 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7925 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7926 [reflect]: https://github.com/rust-lang/rust/pull/23712
7927 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7928 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7929 [index-value]: https://github.com/rust-lang/rust/pull/23601
7930 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7931 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7932 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7933 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7934 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7935 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7938 Version 1.0.0-alpha.2 (2015-02-20)
7939 =====================================
7941 * ~1300 changes, numerous bugfixes
7945 * The various I/O modules were [overhauled][io-rfc] to reduce
7946 unnecessary abstractions and provide better interoperation with
7947 the underlying platform. The old `io` module remains temporarily
7949 * The standard library now [participates in feature gating][feat],
7950 so use of unstable libraries now requires a `#![feature(...)]`
7951 attribute. The impact of this change is [described on the
7952 forum][feat-forum]. [RFC][feat-rfc].
7956 * `for` loops [now operate on the `IntoIterator` trait][into],
7957 which eliminates the need to call `.iter()`, etc. to iterate
7958 over collections. There are some new subtleties to remember
7959 though regarding what sort of iterators various types yield, in
7960 particular that `for foo in bar { }` yields values from a move
7961 iterator, destroying the original collection. [RFC][into-rfc].
7962 * Objects now have [default lifetime bounds][obj], so you don't
7963 have to write `Box<Trait+'static>` when you don't care about
7964 storing references. [RFC][obj-rfc].
7965 * In types that implement `Drop`, [lifetimes must outlive the
7966 value][drop]. This will soon make it possible to safely
7967 implement `Drop` for types where `#[unsafe_destructor]` is now
7968 required. Read the [gorgeous RFC][drop-rfc] for details.
7969 * The fully qualified <T as Trait>::X syntax lets you set the Self
7970 type for a trait method or associated type. [RFC][ufcs-rfc].
7971 * References to types that implement `Deref<U>` now [automatically
7972 coerce to references][deref] to the dereferenced type `U`,
7973 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7974 should eliminate many unsightly uses of `&*`, as when converting
7975 from references to vectors into references to
7976 slices. [RFC][deref-rfc].
7977 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7978 `|:|`) is obsolete and closure kind is inferred from context.
7979 * [`Self` is a keyword][Self].
7983 * The `Show` and `String` formatting traits [have been
7984 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7985 their related purposes. Automatically getting a string
7986 conversion to use with `format!("{:?}", something_to_debug)` is
7987 now written `#[derive(Debug)]`.
7988 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7989 OsStr}`, provide strings in platform-specific encodings for easier
7990 interop with system APIs. [RFC][osstr-rfc].
7991 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7992 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7993 creating raw pointers.
7997 * Certain long error messages of the form 'expected foo found bar'
7998 are now [split neatly across multiple
7999 lines][multiline]. Examples in the PR.
8000 * On Unix Rust can be [uninstalled][un] by running
8001 `/usr/local/lib/rustlib/uninstall.sh`.
8002 * The `#[rustc_on_unimplemented]` attribute, requiring the
8003 'on_unimplemented' feature, lets rustc [display custom error
8004 messages when a trait is expected to be implemented for a type
8009 * Rust is tested against a [LALR grammar][lalr], which parses
8010 almost all the Rust files that rustc does.
8012 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8013 [close]: https://github.com/rust-lang/rust/pull/21843
8014 [deref]: https://github.com/rust-lang/rust/pull/21351
8015 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8016 [drop]: https://github.com/rust-lang/rust/pull/21972
8017 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8018 [feat]: https://github.com/rust-lang/rust/pull/21248
8019 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8020 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8021 [fmt]: https://github.com/rust-lang/rust/pull/21457
8022 [into]: https://github.com/rust-lang/rust/pull/20790
8023 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8024 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8025 [lalr]: https://github.com/rust-lang/rust/pull/21452
8026 [multiline]: https://github.com/rust-lang/rust/pull/19870
8027 [obj]: https://github.com/rust-lang/rust/pull/22230
8028 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8029 [onun]: https://github.com/rust-lang/rust/pull/20889
8030 [osstr]: https://github.com/rust-lang/rust/pull/21488
8031 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8032 [Self]: https://github.com/rust-lang/rust/pull/22158
8033 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8034 [un]: https://github.com/rust-lang/rust/pull/22256
8037 Version 1.0.0-alpha (2015-01-09)
8038 ==================================
8040 * ~2400 changes, numerous bugfixes
8044 * The language itself is considered feature complete for 1.0,
8045 though there will be many usability improvements and bugfixes
8046 before the final release.
8047 * Nearly 50% of the public API surface of the standard library has
8048 been declared 'stable'. Those interfaces are unlikely to change
8050 * The long-running debate over integer types has been
8051 [settled][ints]: Rust will ship with types named `isize` and
8052 `usize`, rather than `int` and `uint`, for pointer-sized
8053 integers. Guidelines will be rolled out during the alpha cycle.
8054 * Most crates that are not `std` have been moved out of the Rust
8055 distribution into the Cargo ecosystem so they can evolve
8056 separately and don't need to be stabilized as quickly, including
8057 'time', 'getopts', 'num', 'regex', and 'term'.
8058 * Documentation continues to be expanded with more API coverage, more
8059 examples, and more in-depth explanations. The guides have been
8060 consolidated into [The Rust Programming Language][trpl].
8061 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8062 * All official Rust binary installers now come with [Cargo], the
8063 Rust package manager.
8067 * Closures have been [completely redesigned][unboxed] to be
8068 implemented in terms of traits, can now be used as generic type
8069 bounds and thus monomorphized and inlined, or via an opaque
8070 pointer (boxed) as in the old system. The new system is often
8071 referred to as 'unboxed' closures.
8072 * Traits now support [associated types][assoc], allowing families
8073 of related types to be defined together and used generically in
8075 * Enum variants are [namespaced by their type names][enum].
8076 * [`where` clauses][where] provide a more versatile and attractive
8077 syntax for specifying generic bounds, though the previous syntax
8079 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8081 * Rust [no longer has a runtime][rt] of any description, and only
8082 supports OS threads, not green threads.
8083 * At long last, Rust has been overhauled for 'dynamically-sized
8084 types' ([DST]), which integrates 'fat pointers' (object types,
8085 arrays, and `str`) more deeply into the type system, making it
8087 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8088 `..j` that produce range types and which, when combined with the
8089 `Index` operator and multidispatch, leads to a convenient slice
8091 * The new range syntax revealed an ambiguity in the fixed-length
8092 array syntax, so now fixed length arrays [are written `[T;
8094 * The `Copy` trait is no longer implemented automatically. Unsafe
8095 pointers no longer implement `Sync` and `Send` so types
8096 containing them don't automatically either. `Sync` and `Send`
8097 are now 'unsafe traits' so one can "forcibly" implement them via
8098 `unsafe impl` if a type confirms to the requirements for them
8099 even though the internals do not (e.g. structs containing unsafe
8100 pointers like `Arc`). These changes are intended to prevent some
8101 footguns and are collectively known as [opt-in built-in
8102 traits][oibit] (though `Sync` and `Send` will soon become pure
8103 library types unknown to the compiler).
8104 * Operator traits now take their operands [by value][ops], and
8105 comparison traits can use multidispatch to compare one type
8106 against multiple other types, allowing e.g. `String` to be
8107 compared with `&str`.
8108 * `if let` and `while let` are no longer feature-gated.
8109 * Rust has adopted a more [uniform syntax for escaping unicode
8110 characters][unicode].
8111 * `macro_rules!` [has been declared stable][mac]. Though it is a
8112 flawed system it is sufficiently popular that it must be usable
8113 for 1.0. Effort has gone into [future-proofing][mac-future] it
8114 in ways that will allow other macro systems to be developed in
8115 parallel, and won't otherwise impact the evolution of the
8117 * The prelude has been [pared back significantly][prelude] such
8118 that it is the minimum necessary to support the most pervasive
8119 code patterns, and through [generalized where clauses][where]
8120 many of the prelude extension traits have been consolidated.
8121 * Rust's rudimentary reflection [has been removed][refl], as it
8122 incurred too much code generation for little benefit.
8123 * [Struct variants][structvars] are no longer feature-gated.
8124 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8125 known as 'higher-ranked trait bounds', this crucially allows
8126 unboxed closures to work.
8127 * Macros invocations surrounded by parens or square brackets and
8128 not terminated by a semicolon are [parsed as
8129 expressions][macros], which makes expressions like `vec![1i32,
8130 2, 3].len()` work as expected.
8131 * Trait objects now implement their traits automatically, and
8132 traits that can be coerced to objects now must be [object
8134 * Automatically deriving traits is now done with `#[derive(...)]`
8135 not `#[deriving(...)]` for [consistency with other naming
8136 conventions][derive].
8137 * Importing the containing module or enum at the same time as
8138 items or variants they contain is [now done with `self` instead
8139 of `mod`][self], as in use `foo::{self, bar}`
8140 * Glob imports are no longer feature-gated.
8141 * The `box` operator and `box` patterns have been feature-gated
8142 pending a redesign. For now unique boxes should be allocated
8143 like other containers, with `Box::new`.
8147 * A [series][coll1] of [efforts][coll2] to establish
8148 [conventions][coll3] for collections types has resulted in API
8149 improvements throughout the standard library.
8150 * New [APIs for error handling][err] provide ergonomic interop
8151 between error types, and [new conventions][err-conv] describe
8152 more clearly the recommended error handling strategies in Rust.
8153 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8154 it is easier to discuss failure in the context of error handling
8155 without making clarifications as to whether you are referring to
8156 the 'fail' macro or failure more generally.
8157 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8158 syscall when available.
8159 * The 'serialize' crate has been renamed 'rustc-serialize' and
8160 moved out of the distribution to Cargo. Although it is widely
8161 used now, it is expected to be superseded in the near future.
8162 * The `Show` formatter, typically implemented with
8163 `#[derive(Show)]` is [now requested with the `{:?}`
8164 specifier][show] and is intended for use by all types, for uses
8165 such as `println!` debugging. The new `String` formatter must be
8166 implemented by hand, uses the `{}` specifier, and is intended
8167 for full-fidelity conversions of things that can logically be
8168 represented as strings.
8172 * [Flexible target specification][flex] allows rustc's code
8173 generation to be configured to support otherwise-unsupported
8175 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8176 respective debuggers with Rust-appropriate pretty-printing.
8177 * The Windows installation of Rust is distributed with the
8178 MinGW components currently required to link binaries on that
8183 * Nullable enum optimizations have been extended to more types so
8184 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8185 space than the inner types themselves.
8186 * Work has begun on supporting AArch64.
8188 [Cargo]: https://crates.io
8189 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8190 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8191 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8192 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8193 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8194 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8195 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8196 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8197 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8198 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8199 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8200 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8201 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8202 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8203 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8204 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8205 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8206 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8207 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8208 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8209 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8210 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8211 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8212 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8213 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8214 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8215 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8216 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8217 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8218 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8219 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8220 [trpl]: https://doc.rust-lang.org/book/index.html
8221 [rbe]: http://rustbyexample.com/
8224 Version 0.12.0 (2014-10-09)
8225 =============================
8227 * ~1900 changes, numerous bugfixes
8231 * The introductory documentation (now called The Rust Guide) has
8232 been completely rewritten, as have a number of supplementary
8234 * Rust's package manager, Cargo, continues to improve and is
8235 sometimes considered to be quite awesome.
8236 * Many API's in `std` have been reviewed and updated for
8237 consistency with the in-development Rust coding
8238 guidelines. The standard library documentation tracks
8239 stabilization progress.
8240 * Minor libraries have been moved out-of-tree to the rust-lang org
8241 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8242 be installed with Cargo.
8243 * Lifetime elision allows lifetime annotations to be left off of
8244 function declarations in many common scenarios.
8245 * Rust now works on 64-bit Windows.
8248 * Indexing can be overloaded with the `Index` and `IndexMut`
8250 * The `if let` construct takes a branch only if the `let` pattern
8251 matches, currently behind the 'if_let' feature gate.
8252 * 'where clauses', a more flexible syntax for specifying trait
8253 bounds that is more aesthetic, have been added for traits and
8254 free functions. Where clauses will in the future make it
8255 possible to constrain associated types, which would be
8256 impossible with the existing syntax.
8257 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8258 the 'slicing_syntax' feature gate, and can be overloaded with
8259 the `Slice` or `SliceMut` traits.
8260 * The syntax for matching of sub-slices has been changed to use a
8261 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8262 consistency with other uses of `..` and to future-proof
8263 potential additional uses of the syntax.
8264 * The syntax for matching inclusive ranges in patterns has changed
8265 from `0..3` to `0...4` to be consistent with the exclusive range
8267 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8268 c]`) has been put behind the 'advanced_slice_patterns' feature
8269 gate and may be removed in the future.
8270 * Components of tuples and tuple structs can be extracted using
8271 the `value.0` syntax, currently behind the `tuple_indexing`
8273 * The `#[crate_id]` attribute is no longer supported; versioning
8274 is handled by the package manager.
8275 * Renaming crate imports are now written `extern crate foo as bar`
8276 instead of `extern crate bar = foo`.
8277 * Renaming use statements are now written `use foo as bar` instead
8279 * `let` and `match` bindings and argument names in macros are now
8281 * The new, more efficient, closure types ('unboxed closures') have
8282 been added under a feature gate, 'unboxed_closures'. These will
8283 soon replace the existing closure types, once higher-ranked
8284 trait lifetimes are added to the language.
8285 * `move` has been added as a keyword, for indicating closures
8286 that capture by value.
8287 * Mutation and assignment is no longer allowed in pattern guards.
8288 * Generic structs and enums can now have trait bounds.
8289 * The `Share` trait is now called `Sync` to free up the term
8290 'shared' to refer to 'shared reference' (the default reference
8292 * Dynamically-sized types have been mostly implemented,
8293 unifying the behavior of fat-pointer types with the rest of the
8295 * As part of dynamically-sized types, the `Sized` trait has been
8296 introduced, which qualifying types implement by default, and
8297 which type parameters expect by default. To specify that a type
8298 parameter does not need to be sized, write `<Sized? T>`. Most
8299 types are `Sized`, notable exceptions being unsized arrays
8300 (`[T]`) and trait types.
8301 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8302 * Lifetime bounds can now be applied to type parameters and object
8304 * The old, reference counted GC type, `Gc<T>` which was once
8305 denoted by the `@` sigil, has finally been removed. GC will be
8306 revisited in the future.
8309 * Library documentation has been improved for a number of modules.
8310 * Bit-vectors, collections::bitv has been modernized.
8311 * The url crate is deprecated in favor of
8312 http://github.com/servo/rust-url, which can be installed with
8314 * Most I/O stream types can be cloned and subsequently closed from
8316 * A `std::time::Duration` type has been added for use in I/O
8317 methods that rely on timers, as well as in the 'time' crate's
8318 `Timespec` arithmetic.
8319 * The runtime I/O abstraction layer that enabled the green thread
8320 scheduler to do non-thread-blocking I/O has been removed, along
8321 with the libuv-based implementation employed by the green thread
8322 scheduler. This will greatly simplify the future I/O work.
8323 * `collections::btree` has been rewritten to have a more
8324 idiomatic and efficient design.
8327 * rustdoc output now indicates the stability levels of API's.
8328 * The `--crate-name` flag can specify the name of the crate
8329 being compiled, like `#[crate_name]`.
8330 * The `-C metadata` specifies additional metadata to hash into
8331 symbol names, and `-C extra-filename` specifies additional
8332 information to put into the output filename, for use by the
8333 package manager for versioning.
8334 * debug info generation has continued to improve and should be
8335 more reliable under both gdb and lldb.
8336 * rustc has experimental support for compiling in parallel
8337 using the `-C codegen-units` flag.
8338 * rustc no longer encodes rpath information into binaries by
8342 * Stack usage has been optimized with LLVM lifetime annotations.
8343 * Official Rust binaries on Linux are more compatible with older
8344 kernels and distributions, built on CentOS 5.10.
8347 Version 0.11.0 (2014-07-02)
8348 ==========================
8350 * ~1700 changes, numerous bugfixes
8353 * ~[T] has been removed from the language. This type is superseded by
8355 * ~str has been removed from the language. This type is superseded by
8357 * ~T has been removed from the language. This type is superseded by the
8359 * @T has been removed from the language. This type is superseded by the
8360 standard library's std::gc::Gc<T> type.
8361 * Struct fields are now all private by default.
8362 * Vector indices and shift amounts are both required to be a `uint`
8363 instead of any integral type.
8364 * Byte character, byte string, and raw byte string literals are now all
8365 supported by prefixing the normal literal with a `b`.
8366 * Multiple ABIs are no longer allowed in an ABI string
8367 * The syntax for lifetimes on closures/procedures has been tweaked
8368 slightly: `<'a>|A, B|: 'b + K -> T`
8369 * Floating point modulus has been removed from the language; however it
8370 is still provided by a library implementation.
8371 * Private enum variants are now disallowed.
8372 * The `priv` keyword has been removed from the language.
8373 * A closure can no longer be invoked through a &-pointer.
8374 * The `use foo, bar, baz;` syntax has been removed from the language.
8375 * The transmute intrinsic no longer works on type parameters.
8376 * Statics now allow blocks/items in their definition.
8377 * Trait bounds are separated from objects with + instead of : now.
8378 * Objects can no longer be read while they are mutably borrowed.
8379 * The address of a static is now marked as insignificant unless the
8380 #[inline(never)] attribute is placed it.
8381 * The #[unsafe_destructor] attribute is now behind a feature gate.
8382 * Struct literals are no longer allowed in ambiguous positions such as
8383 if, while, match, and for..in.
8384 * Declaration of lang items and intrinsics are now feature-gated by
8386 * Integral literals no longer default to `int`, and floating point
8387 literals no longer default to `f64`. Literals must be suffixed with an
8388 appropriate type if inference cannot determine the type of the
8390 * The Box<T> type is no longer implicitly borrowed to &mut T.
8391 * Procedures are now required to not capture borrowed references.
8394 * The standard library is now a "facade" over a number of underlying
8395 libraries. This means that development on the standard library should
8396 be speedier due to smaller crates, as well as a clearer line between
8398 * A new library, libcore, lives under the standard library's facade
8399 which is Rust's "0-assumption" library, suitable for embedded and
8400 kernel development for example.
8401 * A regex crate has been added to the standard distribution. This crate
8402 includes statically compiled regular expressions.
8403 * The unwrap/unwrap_err methods on Result require a Show bound for
8404 better error messages.
8405 * The return types of the std::comm primitives have been centralized
8406 around the Result type.
8407 * A number of I/O primitives have gained the ability to time out their
8409 * A number of I/O primitives have gained the ability to close their
8410 reading/writing halves to cancel pending operations.
8411 * Reverse iterator methods have been removed in favor of `rev()` on
8412 their forward-iteration counterparts.
8413 * A bitflags! macro has been added to enable easy interop with C and
8414 management of bit flags.
8415 * A debug_assert! macro is now provided which is disabled when
8416 `--cfg ndebug` is passed to the compiler.
8417 * A graphviz crate has been added for creating .dot files.
8418 * The std::cast module has been migrated into std::mem.
8419 * The std::local_data api has been migrated from freestanding functions
8420 to being based on methods.
8421 * The Pod trait has been renamed to Copy.
8422 * jemalloc has been added as the default allocator for types.
8423 * The API for allocating memory has been changed to use proper alignment
8424 and sized deallocation
8425 * Connecting a TcpStream or binding a TcpListener is now based on a
8426 string address and a u16 port. This allows connecting to a hostname as
8428 * The Reader trait now contains a core method, read_at_least(), which
8429 correctly handles many repeated 0-length reads.
8430 * The process-spawning API is now centered around a builder-style
8432 * The :? printing qualifier has been moved from the standard library to
8433 an external libdebug crate.
8434 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8435 have been renamed to Eq/Ord.
8436 * The select/plural methods have been removed from format!. The escapes
8437 for { and } have also changed from \{ and \} to {{ and }},
8439 * The TaskBuilder API has been re-worked to be a true builder, and
8440 extension traits for spawning native/green tasks have been added.
8443 * All breaking changes to the language or libraries now have their
8444 commit message annotated with `[breaking-change]` to allow for easy
8445 discovery of breaking changes.
8446 * The compiler will now try to suggest how to annotate lifetimes if a
8447 lifetime-related error occurs.
8448 * Debug info continues to be improved greatly with general bug fixes and
8449 better support for situations like link time optimization (LTO).
8450 * Usage of syntax extensions when cross-compiling has been fixed.
8451 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8452 -fdata-sections and --gc-sections has been enabled by default
8453 * The compiler is now stricter about where it will load module files
8454 from when a module is declared via `mod foo;`.
8455 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8456 Syntax extensions are now discovered via a "plugin registrar" type
8457 which will be extended in the future to other various plugins.
8458 * Lints have been restructured to allow for dynamically loadable lints.
8459 * A number of rustdoc improvements:
8460 * The HTML output has been visually redesigned.
8461 * Markdown is now powered by hoedown instead of sundown.
8462 * Searching heuristics have been greatly improved.
8463 * The search index has been reduced in size by a great amount.
8464 * Cross-crate documentation via `pub use` has been greatly improved.
8465 * Primitive types are now hyperlinked and documented.
8466 * Documentation has been moved from static.rust-lang.org/doc to
8468 * A new sandbox, play.rust-lang.org, is available for running and
8469 sharing rust code examples on-line.
8470 * Unused attributes are now more robustly warned about.
8471 * The dead_code lint now warns about unused struct fields.
8472 * Cross-compiling to iOS is now supported.
8473 * Cross-compiling to mipsel is now supported.
8474 * Stability attributes are now inherited by default and no longer apply
8475 to intra-crate usage, only inter-crate usage.
8476 * Error message related to non-exhaustive match expressions have been
8480 Version 0.10 (2014-04-03)
8481 =========================
8483 * ~1500 changes, numerous bugfixes
8486 * A new RFC process is now in place for modifying the language.
8487 * Patterns with `@`-pointers have been removed from the language.
8488 * Patterns with unique vectors (`~[T]`) have been removed from the
8490 * Patterns with unique strings (`~str`) have been removed from the
8492 * `@str` has been removed from the language.
8493 * `@[T]` has been removed from the language.
8494 * `@self` has been removed from the language.
8495 * `@Trait` has been removed from the language.
8496 * Headers on `~` allocations which contain `@` boxes inside the type for
8497 reference counting have been removed.
8498 * The semantics around the lifetimes of temporary expressions have changed,
8499 see #3511 and #11585 for more information.
8500 * Cross-crate syntax extensions are now possible, but feature gated. See
8501 #11151 for more information. This includes both `macro_rules!` macros as
8502 well as syntax extensions such as `format!`.
8503 * New lint modes have been added, and older ones have been turned on to be
8505 * Unnecessary parentheses
8508 * Uppercase variables
8509 * Publicly visible private types
8510 * `#[deriving]` with raw pointers
8511 * Unsafe functions can no longer be coerced to closures.
8512 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8513 * The `#[simd]` attribute is now behind a feature gate.
8514 * Visibility is no longer allowed on `extern crate` statements, and
8515 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8516 * Trailing commas are now allowed in argument lists and tuple patterns.
8517 * The `do` keyword has been removed, it is now a reserved keyword.
8518 * Default type parameters have been implemented, but are feature gated.
8519 * Borrowed variables through captures in closures are now considered soundly.
8520 * `extern mod` is now `extern crate`
8521 * The `Freeze` trait has been removed.
8522 * The `Share` trait has been added for types that can be shared among
8524 * Labels in macros are now hygienic.
8525 * Expression/statement macro invocations can be delimited with `{}` now.
8526 * Treatment of types allowed in `static mut` locations has been tweaked.
8527 * The `*` and `.` operators are now overloadable through the `Deref` and
8529 * `~Trait` and `proc` no longer have `Send` bounds by default.
8530 * Partial type hints are now supported with the `_` type marker.
8531 * An `Unsafe` type was introduced for interior mutability. It is now
8532 considered undefined to transmute from `&T` to `&mut T` without using the
8534 * The #[linkage] attribute was implemented for extern statics/functions.
8535 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8536 * `Pod` was renamed to `Copy`.
8539 * The `libextra` library has been removed. It has now been decomposed into
8540 component libraries with smaller and more focused nuggets of
8541 functionality. The full list of libraries can be found on the
8542 documentation index page.
8543 * std: `std::condition` has been removed. All I/O errors are now propagated
8544 through the `Result` type. In order to assist with error handling, a
8545 `try!` macro for unwrapping errors with an early return and a lint for
8546 unused results has been added. See #12039 for more information.
8547 * std: The `vec` module has been renamed to `slice`.
8548 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8549 This will become the only growable vector in the future.
8550 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8551 are now found at `std::io::BufferedReader` instead of
8552 `std::io::buffered::BufferedReader`.
8553 * std: `print` and `println` are no longer in the prelude, the `print!` and
8554 `println!` macros are intended to be used instead.
8555 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8556 attempts to statically prevent cycles.
8557 * std: The standard distribution is adopting the policy of pushing failure
8558 to the user rather than failing in libraries. Many functions (such as
8559 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8560 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8561 deriving mode: `#[deriving(Show)]`.
8562 * std: `ToStr` is now implemented for all types implementing `Show`.
8563 * std: The formatting trait methods now take `&self` instead of `&T`
8564 * std: The `invert()` method on iterators has been renamed to `rev()`
8565 * std: `std::num` has seen a reduction in the genericity of its traits,
8566 consolidating functionality into a few core traits.
8567 * std: Backtraces are now printed on task failure if the environment
8568 variable `RUST_BACKTRACE` is present.
8569 * std: Naming conventions for iterators have been standardized. More details
8570 can be found on the wiki's style guide.
8571 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8572 still implement the function.
8573 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8574 * std: `assert_approx_eq!` has been removed
8575 * std: The `e` and `E` formatting specifiers for floats have been added to
8576 print them in exponential notation.
8577 * std: The `Times` trait has been removed
8578 * std: Indications of variance and opting out of builtin bounds is done
8579 through marker types in `std::kinds::marker` now
8580 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8581 `#[deriving(Hash)]` is now possible.
8582 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8583 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8584 * std: `Chan::new` is now `channel()`.
8585 * std: A new synchronous channel type has been implemented.
8586 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8587 * std: `hashmap` and `trie` have been moved to `libcollections`
8588 * std: `run` has been rolled into `io::process`
8589 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8590 * std: The equality and comparison traits have seen some reorganization.
8591 * std: `rand` has moved to `librand`.
8592 * std: `to_{lower,upper}case` has been implemented for `char`.
8593 * std: Logging has been moved to `liblog`.
8594 * collections: `HashMap` has been rewritten for higher performance and less
8596 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8597 it can be booted manually. The runtime guide has more information and
8599 * native: All I/O functionality except signals has been implemented.
8600 * green: Task spawning with `libgreen` has been optimized with stack caching
8601 and various trimming of code.
8602 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8603 * sync: The `extra::sync` module has been updated to modern rust (and moved
8604 to the `sync` library), tweaking and improving various interfaces while
8605 dropping redundant functionality.
8606 * sync: A new `Barrier` type has been added to the `sync` library.
8607 * sync: An efficient mutex for native and green tasks has been implemented.
8608 * serialize: The `base64` module has seen some improvement. It treats
8609 newlines better, has non-string error values, and has seen general
8611 * fourcc: A `fourcc!` macro was introduced
8612 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8613 hexadecimal literal.
8616 * `rustpkg` has been deprecated and removed from the main repository. Its
8617 replacement, `cargo`, is under development.
8618 * Nightly builds of rust are now available
8619 * The memory usage of rustc has been improved many times throughout this
8621 * The build process supports disabling rpath support for the rustc binary
8623 * Code generation has improved in some cases, giving more information to the
8624 LLVM optimization passes to enable more extensive optimizations.
8625 * Debuginfo compatibility with lldb on OSX has been restored.
8626 * The master branch is now gated on an android bot, making building for
8627 android much more reliable.
8628 * Output flags have been centralized into one `--emit` flag.
8629 * Crate type flags have been centralized into one `--crate-type` flag.
8630 * Codegen flags have been consolidated behind a `-C` flag.
8631 * Linking against outdated crates now has improved error messages.
8632 * Error messages with lifetimes will often suggest how to annotate the
8633 function to fix the error.
8634 * Many more types are documented in the standard library, and new guides
8636 * Many `rustdoc` improvements:
8637 * code blocks are syntax highlighted.
8638 * render standalone markdown files.
8639 * the --test flag tests all code blocks by default.
8640 * exported macros are displayed.
8641 * re-exported types have their documentation inlined at the location of the
8643 * search works across crates that have been rendered to the same output
8647 Version 0.9 (2014-01-09)
8648 ==========================
8650 * ~1800 changes, numerous bugfixes
8653 * The `float` type has been removed. Use `f32` or `f64` instead.
8654 * A new facility for enabling experimental features (feature gating) has
8655 been added, using the crate-level `#[feature(foo)]` attribute.
8656 * Managed boxes (@) are now behind a feature gate
8657 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8658 standard library's `Gc` or `Rc` types instead.
8659 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8660 * Jumping back to the top of a loop is now done with `continue` instead of
8662 * Strings can no longer be mutated through index assignment.
8663 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8664 hash delimiters, as in `r###"foo"###`.
8665 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8667 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8668 * `@fn`s have been removed.
8669 * `do` only works with procs in order to make it obvious what the cost
8671 * Single-element tuple-like structs can no longer be dereferenced to
8672 obtain the inner value. A more comprehensive solution for overloading
8673 the dereference operator will be provided in the future.
8674 * The `#[link(...)]` attribute has been replaced with
8675 `#[crate_id = "name#vers"]`.
8676 * Empty `impl`s must be terminated with empty braces and may not be
8677 terminated with a semicolon.
8678 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8679 no longer has any special meaning.
8680 * The old `fmt!` string formatting macro has been removed.
8681 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8682 `print!` and `println!`.
8683 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8684 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8685 `extern mod foo = "bar"` instead.
8686 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8687 * Macros can have attributes.
8688 * Macros can expand to items with attributes.
8689 * Macros can expand to multiple items.
8690 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8691 * Comments may be nested.
8692 * Values automatically coerce to trait objects they implement, without
8694 * Enum discriminants are no longer an entire word but as small as needed to
8695 contain all the variants. The `repr` attribute can be used to override
8696 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8697 `#[repr(C)]` to match C enums.
8698 * Non-string literals are not allowed in attributes (they never worked).
8699 * The FFI now supports variadic functions.
8700 * Octal numeric literals, as in `0o7777`.
8701 * The `concat!` syntax extension performs compile-time string concatenation.
8702 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8703 removed as Rust no longer uses segmented stacks.
8704 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8705 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8706 not `*`; ignoring remaining fields of a struct is also done with `..`,
8707 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8708 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8709 * `rustc` supports the "system" calling convention, which defaults to the
8710 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8712 * The `type_overflow` lint (default: warn) checks literals for overflow.
8713 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8714 * The `attribute_usage` lint (default: warn) warns about unknown
8716 * The `unknown_features` lint (default: warn) warns about unknown
8718 * The `dead_code` lint (default: warn) checks for dead code.
8719 * Rust libraries can be linked statically to one another
8720 * `#[link_args]` is behind the `link_args` feature gate.
8721 * Native libraries are now linked with `#[link(name = "foo")]`
8722 * Native libraries can be statically linked to a rust crate
8723 (`#[link(name = "foo", kind = "static")]`).
8724 * Native OS X frameworks are now officially supported
8725 (`#[link(name = "foo", kind = "framework")]`).
8726 * The `#[thread_local]` attribute creates thread-local (not task-local)
8727 variables. Currently behind the `thread_local` feature gate.
8728 * The `return` keyword may be used in closures.
8729 * Types that can be copied via a memcpy implement the `Pod` kind.
8730 * The `cfg` attribute can now be used on struct fields and enum variants.
8733 * std: The `option` and `result` API's have been overhauled to make them
8734 simpler, more consistent, and more composable.
8735 * std: The entire `std::io` module has been replaced with one that is
8736 more comprehensive and that properly interfaces with the underlying
8737 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8739 * std: `io::util` contains a number of useful implementations of
8740 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8741 `ZeroReader`, `TeeReader`.
8742 * std: The reference counted pointer type `extra::rc` moved into std.
8743 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8744 just a wrapper around it).
8745 * std: The `Either` type has been removed.
8746 * std: `fmt::Default` can be implemented for any type to provide default
8747 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8748 * std: The `rand` API continues to be tweaked.
8749 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8750 on failure in gdb, is now named `rust_fail`.
8751 * std: The `each_key` and `each_value` methods on `HashMap` have been
8752 replaced by the `keys` and `values` iterators.
8753 * std: Functions dealing with type size and alignment have moved from the
8754 `sys` module to the `mem` module.
8755 * std: The `path` module was written and API changed.
8756 * std: `str::from_utf8` has been changed to cast instead of allocate.
8757 * std: `starts_with` and `ends_with` methods added to vectors via the
8758 `ImmutableEqVector` trait, which is in the prelude.
8759 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8760 if the index is out of bounds.
8761 * std: Task failure no longer propagates between tasks, as the model was
8762 complex, expensive, and incompatible with thread-based tasks.
8763 * std: The `Any` type can be used for dynamic typing.
8764 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8766 * std: Methods that produce iterators generally do not have an `_iter`
8768 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8769 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8770 * std: `util::ignore` renamed to `prelude::drop`.
8771 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8773 * std: `vec::raw` has seen a lot of cleanup and API changes.
8774 * std: The standard library no longer includes any C++ code, and very
8775 minimal C, eliminating the dependency on libstdc++.
8776 * std: Runtime scheduling and I/O functionality has been factored out into
8777 extensible interfaces and is now implemented by two different crates:
8778 libnative, for native threading and I/O; and libgreen, for green threading
8779 and I/O. This paves the way for using the standard library in more limited
8780 embedded environments.
8781 * std: The `comm` module has been rewritten to be much faster, have a
8782 simpler, more consistent API, and to work for both native and green
8784 * std: All libuv dependencies have been moved into the rustuv crate.
8785 * native: New implementations of runtime scheduling on top of OS threads.
8786 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8788 * green: The green thread scheduler and message passing types are almost
8790 * extra: The `flatpipes` module had bitrotted and was removed.
8791 * extra: All crypto functions have been removed and Rust now has a policy of
8792 not reimplementing crypto in the standard library. In the future crypto
8793 will be provided by external crates with bindings to established libraries.
8794 * extra: `c_vec` has been modernized.
8795 * extra: The `sort` module has been removed. Use the `sort` method on
8799 * The `rust` and `rusti` commands have been removed, due to lack of
8801 * `rustdoc` was completely rewritten.
8802 * `rustdoc` can test code examples in documentation.
8803 * `rustpkg` can test packages with the argument, 'test'.
8804 * `rustpkg` supports arbitrary dependencies, including C libraries.
8805 * `rustc`'s support for generating debug info is improved again.
8806 * `rustc` has better error reporting for unbalanced delimiters.
8807 * `rustc`'s JIT support was removed due to bitrot.
8808 * Executables and static libraries can be built with LTO (-Z lto)
8809 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8813 Version 0.8 (2013-09-26)
8814 ============================
8816 * ~2200 changes, numerous bugfixes
8819 * The `for` loop syntax has changed to work with the `Iterator` trait.
8820 * At long last, unwinding works on Windows.
8821 * Default methods are ready for use.
8822 * Many trait inheritance bugs fixed.
8823 * Owned and borrowed trait objects work more reliably.
8824 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8825 * rustc can omit emission of code for the `debug!` macro if it is passed
8827 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8828 for foo.rs, then foo/mod.rs, and will generate an error when both are
8830 * Strings no longer contain trailing nulls. The new `std::c_str` module
8831 provides new mechanisms for converting to C strings.
8832 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8833 * The FFI has been overhauled such that foreign functions are called directly,
8834 instead of through a stack-switching wrapper.
8835 * Calling a foreign function must be done through a Rust function with the
8836 `#[fixed_stack_segment]` attribute.
8837 * The `externfn!` macro can be used to declare both a foreign function and
8838 a `#[fixed_stack_segment]` wrapper at once.
8839 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8840 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8841 * `priv` is disallowed everywhere except for struct fields and enum variants.
8842 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8843 * `ref` bindings in irrefutable patterns work correctly now.
8844 * `char` is now prevented from containing invalid code points.
8845 * Casting to `bool` is no longer allowed.
8846 * `\0` is now accepted as an escape in chars and strings.
8847 * `yield` is a reserved keyword.
8848 * `typeof` is a reserved keyword.
8849 * Crates may be imported by URL with `extern mod foo = "url";`.
8850 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8851 * Static vectors can be initialized with repeating elements,
8852 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8853 * Static structs can be initialized with functional record update,
8854 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8855 * `cfg!` can be used to conditionally execute code based on the crate
8856 configuration, similarly to `#[cfg(...)]`.
8857 * The `unnecessary_qualification` lint detects unneeded module
8858 prefixes (default: allow).
8859 * Arithmetic operations have been implemented on the SIMD types in
8860 `std::unstable::simd`.
8861 * Exchange allocation headers were removed, reducing memory usage.
8862 * `format!` implements a completely new, extensible, and higher-performance
8863 string formatting system. It will replace `fmt!`.
8864 * `print!` and `println!` write formatted strings (using the `format!`
8865 extension) to stdout.
8866 * `write!` and `writeln!` write formatted strings (using the `format!`
8867 extension) to the new Writers in `std::rt::io`.
8868 * The library section in which a function or static is placed may
8869 be specified with `#[link_section = "..."]`.
8870 * The `proto!` syntax extension for defining bounded message protocols
8872 * `macro_rules!` is hygienic for `let` declarations.
8873 * The `#[export_name]` attribute specifies the name of a symbol.
8874 * `unreachable!` can be used to indicate unreachable code, and fails
8878 * std: Transitioned to the new runtime, written in Rust.
8879 * std: Added an experimental I/O library, `rt::io`, based on the new
8881 * std: A new generic `range` function was added to the prelude, replacing
8882 `uint::range` and friends.
8883 * std: `range_rev` no longer exists. Since range is an iterator it can be
8884 reversed with `range(lo, hi).invert()`.
8885 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8886 renamed to `unwrap_or`.
8887 * std: The `iterator` module was renamed to `iter`.
8888 * std: Integral types now support the `checked_add`, `checked_sub`, and
8889 `checked_mul` operations for detecting overflow.
8890 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8892 * std: Methods are standardizing on conventions for casting methods:
8893 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8895 * std: The `CString` type in `c_str` provides new ways to convert to and
8897 * std: `DoubleEndedIterator` can yield elements in two directions.
8898 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8900 * std: `str::from_bytes` renamed to `str::from_utf8`.
8901 * std: `pop_opt` and `shift_opt` methods added to vectors.
8902 * std: The task-local data interface no longer uses @, and keys are
8903 no longer function pointers.
8904 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8905 * std: Added `SharedPort` to `comm`.
8906 * std: `Eq` has a default method for `ne`; only `eq` is required
8908 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8909 is required in implementations.
8910 * std: `is_utf8` performance is improved, impacting many string functions.
8911 * std: `os::MemoryMap` provides cross-platform mmap.
8912 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8913 are not 'in-bounds' are considered undefined.
8914 * std: Many freestanding functions in `vec` removed in favor of methods.
8915 * std: Many freestanding functions on scalar types removed in favor of
8917 * std: Many options to task builders were removed since they don't make
8918 sense in the new scheduler design.
8919 * std: More containers implement `FromIterator` so can be created by the
8921 * std: More complete atomic types in `unstable::atomics`.
8922 * std: `comm::PortSet` removed.
8923 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8924 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8925 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8926 default implementations.
8927 * std: Various `from_str` functions were removed in favor of a generic
8928 `from_str` which is available in the prelude.
8929 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8930 * extra: `dlist`, the doubly-linked list was modernized.
8931 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8932 * extra: Added `glob` module, replacing `std::os::glob`.
8933 * extra: `rope` was removed.
8934 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8935 * extra: `net`, and `timer` were removed. The experimental replacements
8936 are `std::rt::io::net` and `std::rt::io::timer`.
8937 * extra: Iterators implemented for `SmallIntMap`.
8938 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8939 * extra: `SmallIntSet` removed. Use `BitvSet`.
8940 * extra: Performance of JSON parsing greatly improved.
8941 * extra: `semver` updated to SemVer 2.0.0.
8942 * extra: `term` handles more terminals correctly.
8943 * extra: `dbg` module removed.
8944 * extra: `par` module removed.
8945 * extra: `future` was cleaned up, with some method renames.
8946 * extra: Most free functions in `getopts` were converted to methods.
8949 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8950 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8951 similarly to gcc's `--march` flag.
8952 * rustc's performance compiling small crates is much better.
8953 * rustpkg has received many improvements.
8954 * rustpkg supports git tags as package IDs.
8955 * rustpkg builds into target-specific directories so it can be used for
8957 * The number of concurrent test tasks is controlled by the environment
8958 variable RUST_TEST_TASKS.
8959 * The test harness can now report metrics for benchmarks.
8960 * All tools have man pages.
8961 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8962 * The runtime uses jemalloc for allocations.
8963 * Segmented stacks are temporarily disabled as part of the transition to
8964 the new runtime. Stack overflows are possible!
8965 * A new documentation backend, rustdoc_ng, is available for use. It is
8966 still invoked through the normal `rustdoc` command.
8969 Version 0.7 (2013-07-03)
8970 =======================
8972 * ~2000 changes, numerous bugfixes
8975 * `impl`s no longer accept a visibility qualifier. Put them on methods
8977 * The borrow checker has been rewritten with flow-sensitivity, fixing
8978 many bugs and inconveniences.
8979 * The `self` parameter no longer implicitly means `&'self self`,
8980 and can be explicitly marked with a lifetime.
8981 * Overloadable compound operators (`+=`, etc.) have been temporarily
8982 removed due to bugs.
8983 * The `for` loop protocol now requires `for`-iterators to return `bool`
8984 so they compose better.
8985 * The `Durable` trait is replaced with the `'static` bounds.
8986 * Trait default methods work more often.
8987 * Structs with the `#[packed]` attribute have byte alignment and
8988 no padding between fields.
8989 * Type parameters bound by `Copy` must now be copied explicitly with
8991 * It is now illegal to move out of a dereferenced unsafe pointer.
8992 * `Option<~T>` is now represented as a nullable pointer.
8993 * `@mut` does dynamic borrow checks correctly.
8994 * The `main` function is only detected at the topmost level of the crate.
8995 The `#[main]` attribute is still valid anywhere.
8996 * Struct fields may no longer be mutable. Use inherited mutability.
8997 * The `#[no_send]` attribute makes a type that would otherwise be
8999 * The `#[no_freeze]` attribute makes a type that would otherwise be
9001 * Unbounded recursion will abort the process after reaching the limit
9002 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9003 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9004 are never implicitly copyable.
9005 * `#[static_assert]` makes compile-time assertions about static bools.
9006 * At long last, 'argument modes' no longer exist.
9007 * The rarely used `use mod` statement no longer exists.
9010 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9012 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9013 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9015 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9016 and unsuffixed integer literals.
9019 * The `core` crate was renamed to `std`.
9020 * The `std` crate was renamed to `extra`.
9021 * More and improved documentation.
9022 * std: `iterator` module for external iterator objects.
9023 * Many old-style (internal, higher-order function) iterators replaced by
9024 implementations of `Iterator`.
9025 * std: Many old internal vector and string iterators,
9026 incl. `any`, `all`. removed.
9027 * std: The `finalize` method of `Drop` renamed to `drop`.
9028 * std: The `drop` method now takes `&mut self` instead of `&self`.
9029 * std: The prelude no longer re-exports any modules, only types and traits.
9030 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9031 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9032 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9033 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9034 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9035 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9036 * std: Many types implement `Clone`.
9037 * std: `path` type renamed to `Path`.
9038 * std: `mut` module and `Mut` type removed.
9039 * std: Many standalone functions removed in favor of methods and iterators
9040 in `vec`, `str`. In the future methods will also work as functions.
9041 * std: `reinterpret_cast` removed. Use `transmute`.
9042 * std: ascii string handling in `std::ascii`.
9043 * std: `Rand` is implemented for ~/@.
9044 * std: `run` module for spawning processes overhauled.
9045 * std: Various atomic types added to `unstable::atomic`.
9046 * std: Various types implement `Zero`.
9047 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9048 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9049 * std: Added `os::mkdir_recursive`.
9050 * std: Added `os::glob` function performs filesystems globs.
9051 * std: `FuzzyEq` renamed to `ApproxEq`.
9052 * std: `Map` now defines `pop` and `swap` methods.
9053 * std: `Cell` constructors converted to static methods.
9054 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9055 * extra: `flate` module moved from `std` to `extra`.
9056 * extra: `fileinput` module for iterating over a series of files.
9057 * extra: `Complex` number type and `complex` module.
9058 * extra: `Rational` number type and `rational` module.
9059 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9060 * extra: `term` uses terminfo now, is more correct.
9061 * extra: `arc` functions converted to methods.
9062 * extra: Implementation of fixed output size variations of SHA-2.
9065 * `unused_variables` lint mode for unused variables (default: warn).
9066 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9068 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9070 * `dead_assignment` lint mode for unread variables (default: warn).
9071 * `unnecessary_allocation` lint mode detects some heap allocations that are
9072 immediately borrowed so could be written without allocating (default: warn).
9073 * `missing_doc` lint mode (default: allow).
9074 * `unreachable_code` lint mode (default: warn).
9075 * The `rusti` command has been rewritten and a number of bugs addressed.
9076 * rustc outputs in color on more terminals.
9077 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9078 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9079 * Compiling with `-g` will make the binary record information about
9080 dynamic borrowcheck failures for debugging.
9081 * rustdoc has a nicer stylesheet.
9082 * Various improvements to rustdoc.
9083 * Improvements to rustpkg (see the detailed release notes).
9086 Version 0.6 (2013-04-03)
9087 ========================
9089 * ~2100 changes, numerous bugfixes
9092 * The self type parameter in traits is now spelled `Self`
9093 * The `self` parameter in trait and impl methods must now be explicitly
9094 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9095 * Static methods no longer require the `static` keyword and instead
9096 are distinguished by the lack of a `self` parameter
9097 * Replaced the `Durable` trait with the `'static` lifetime
9098 * The old closure type syntax with the trailing sigil has been
9099 removed in favor of the more consistent leading sigil
9100 * `super` is a keyword, and may be prefixed to paths
9101 * Trait bounds are separated with `+` instead of whitespace
9102 * Traits are implemented with `impl Trait for Type`
9103 instead of `impl Type: Trait`
9104 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9105 * The `export` keyword has finally been removed
9106 * The `move` keyword has been removed (see "Semantic changes")
9107 * The interior mutability qualifier on vectors, `[mut T]`, has been
9108 removed. Use `&mut [T]`, etc.
9109 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9110 * `fail` is no longer a keyword. Use `fail!()`
9111 * `assert` is no longer a keyword. Use `assert!()`
9112 * `log` is no longer a keyword. use `debug!`, etc.
9113 * 1-tuples may be represented as `(T,)`
9114 * Struct fields may no longer be `mut`. Use inherited mutability,
9115 `@mut T`, `core::mut` or `core::cell`
9116 * `extern mod { ... }` is no longer valid syntax for foreign
9117 function modules. Use extern blocks: `extern { ... }`
9118 * Newtype enums removed. Use tuple-structs.
9119 * Trait implementations no longer support visibility modifiers
9120 * Pattern matching over vectors improved and expanded
9121 * `const` renamed to `static` to correspond to lifetime name,
9122 and make room for future `static mut` unsafe mutable globals.
9123 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9124 * `Clone` implementations can be automatically generated with
9125 `#[deriving(Clone)]`
9126 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9127 instead of `foo as Bar`.
9128 * Fixed length vector types are now written as `[int, .. 3]`
9129 instead of `[int * 3]`.
9130 * Fixed length vector types can express the length as a constant
9131 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9134 * Types with owned pointers or custom destructors move by default,
9135 eliminating the `move` keyword
9136 * All foreign functions are considered unsafe
9137 * &mut is now unaliasable
9138 * Writes to borrowed @mut pointers are prevented dynamically
9140 * The name of the main function can be customized using #[main]
9141 * The default type of an inferred closure is &fn instead of @fn
9142 * `use` statements may no longer be "chained" - they cannot import
9143 identifiers imported by previous `use` statements
9144 * `use` statements are crate relative, importing from the "top"
9145 of the crate by default. Paths may be prefixed with `super::`
9146 or `self::` to change the search behavior.
9147 * Method visibility is inherited from the implementation declaration
9148 * Structural records have been removed
9149 * Many more types can be used in static items, including enums
9150 'static-lifetime pointers and vectors
9151 * Pattern matching over vectors improved and expanded
9152 * Typechecking of closure types has been overhauled to
9153 improve inference and eliminate unsoundness
9154 * Macros leave scope at the end of modules, unless that module is
9155 tagged with #[macro_escape]
9158 * Added big integers to `std::bigint`
9159 * Removed `core::oldcomm` module
9160 * Added pipe-based `core::comm` module
9161 * Numeric traits have been reorganized under `core::num`
9162 * `vec::slice` finally returns a slice
9163 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9164 * Containers reorganized around traits in `core::container`
9165 * `core::dvec` removed, `~[T]` is a drop-in replacement
9166 * `core::send_map` renamed to `core::hashmap`
9167 * `std::map` removed; replaced with `core::hashmap`
9168 * `std::treemap` reimplemented as an owned balanced tree
9169 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9170 * `core::trie` added as a fast ordered map for integer keys
9171 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9172 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9173 overload the comparison operators, whereas `TotalOrd` is used
9174 by certain container types
9177 * Replaced the 'cargo' package manager with 'rustpkg'
9178 * Added all-purpose 'rust' tool
9179 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9180 * rustc now *attempts* to offer spelling suggestions
9181 * Improved support for ARM and Android
9182 * Preliminary MIPS backend
9183 * Improved foreign function ABI implementation for x86, x86_64
9184 * Various memory usage improvements
9185 * Rust code may be embedded in foreign code under limited circumstances
9186 * Inline assembler supported by new asm!() syntax extension.
9189 Version 0.5 (2012-12-21)
9190 ===========================
9192 * ~900 changes, numerous bugfixes
9195 * Removed `<-` move operator
9196 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9197 * Removed old fixed length vector syntax - `[T]/N`
9198 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9199 * Macros may now expand to items and statements
9200 * `a.b()` is always parsed as a method call, never as a field projection
9201 * `Eq` and `IterBytes` implementations can be automatically generated
9202 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9203 * Removed the special crate language for `.rc` files
9204 * Function arguments may consist of any irrefutable pattern
9207 * `&` and `~` pointers may point to objects
9208 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9209 * Enum variants may be structs
9210 * Destructors can be added to all nominal types with the Drop trait
9211 * Structs and nullary enum variants may be constants
9212 * Values that cannot be implicitly copied are now automatically moved
9213 without writing `move` explicitly
9214 * `&T` may now be coerced to `*T`
9215 * Coercions happen in `let` statements as well as function calls
9216 * `use` statements now take crate-relative paths
9217 * The module and type namespaces have been merged so that static
9218 method names can be resolved under the trait in which they are
9221 * Improved support for language features
9222 * Trait inheritance works in many scenarios
9223 * More support for explicit self arguments in methods - `self`, `&self`
9224 `@self`, and `~self` all generally work as expected
9225 * Static methods work in more situations
9226 * Experimental: Traits may declare default methods for the implementations
9230 * New condition handling system in `core::condition`
9231 * Timsort added to `std::sort`
9232 * New priority queue, `std::priority_queue`
9233 * Pipes for serializable types, `std::flatpipes'
9234 * Serialization overhauled to be trait-based
9235 * Expanded `getopts` definitions
9236 * Moved futures to `std`
9237 * More functions are pure now
9238 * `core::comm` renamed to `oldcomm`. Still deprecated
9239 * `rustdoc` and `cargo` are libraries now
9242 * Added a preliminary REPL, `rusti`
9243 * License changed from MIT to dual MIT/APL2
9246 Version 0.4 (2012-10-15)
9247 ==========================
9249 * ~2000 changes, numerous bugfixes
9252 * All keywords are now strict and may not be used as identifiers anywhere
9253 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9254 'of', 'with', 'to', 'class'.
9255 * Classes are replaced with simpler structs
9256 * Explicit method self types
9257 * `ret` became `return` and `alt` became `match`
9258 * `import` is now `use`; `use is now `extern mod`
9259 * `extern mod { ... }` is now `extern { ... }`
9260 * `use mod` is the recommended way to import modules
9261 * `pub` and `priv` replace deprecated export lists
9262 * The syntax of `match` pattern arms now uses fat arrow (=>)
9263 * `main` no longer accepts an args vector; use `os::args` instead
9266 * Trait implementations are now coherent, ala Haskell typeclasses
9267 * Trait methods may be static
9268 * Argument modes are deprecated
9269 * Borrowed pointers are much more mature and recommended for use
9270 * Strings and vectors in the static region are stored in constant memory
9271 * Typestate was removed
9272 * Resolution rewritten to be more reliable
9273 * Support for 'dual-mode' data structures (freezing and thawing)
9276 * Most binary operators can now be overloaded via the traits in
9278 * `std::net::url` for representing URLs
9279 * Sendable hash maps in `core::send_map`
9280 * `core::task' gained a (currently unsafe) task-local storage API
9283 * An efficient new intertask communication primitive called the pipe,
9284 along with a number of higher-level channel types, in `core::pipes`
9285 * `std::arc`, an atomically reference counted, immutable, shared memory
9287 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9288 * Futures are now based on pipes and sendable
9289 * More robust linked task failure
9290 * Improved task builder API
9293 * Improved error reporting
9294 * Preliminary JIT support
9295 * Preliminary work on precise GC
9296 * Extensive architectural improvements to rustc
9297 * Begun a transition away from buggy C++-based reflection (shape) code to
9298 Rust-based (visitor) code
9299 * All hash functions and tables converted to secure, randomized SipHash
9302 Version 0.3 (2012-07-12)
9303 ========================
9305 * ~1900 changes, numerous bugfixes
9307 * New coding conveniences
9308 * Integer-literal suffix inference
9309 * Per-item control over warnings, errors
9310 * #[cfg(windows)] and #[cfg(unix)] attributes
9311 * Documentation comments
9312 * More compact closure syntax
9313 * 'do' expressions for treating higher-order functions as
9315 * *-patterns (wildcard extended to all constructor fields)
9318 * Name resolution pass and exhaustiveness checker rewritten
9319 * Region pointers and borrow checking supersede alias
9321 * Init-ness checking is now provided by a region-based liveness
9322 pass instead of the typestate pass; same for last-use analysis
9323 * Extensive work on region pointers
9325 * Experimental new language features
9326 * Slices and fixed-size, interior-allocated vectors
9327 * #!-comments for lang versioning, shell execution
9328 * Destructors and iface implementation for classes;
9329 type-parameterized classes and class methods
9330 * 'const' type kind for types that can be used to implement
9331 shared-memory concurrency patterns
9335 * Removal of various obsolete features
9336 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9337 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9339 * Constructs: do-while loops ('do' repurposed), fn binding,
9340 resources (replaced by destructors)
9342 * Compiler reorganization
9343 * Syntax-layer of compiler split into separate crate
9344 * Clang (from LLVM project) integrated into build
9345 * Typechecker split into sub-modules
9348 * New time functions
9349 * Extension methods for many built-in types
9350 * Arc: atomic-refcount read-only / exclusive-use shared cells
9351 * Par: parallel map and search routines
9352 * Extensive work on libuv interface
9353 * Much vector code moved to libraries
9354 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9355 #include, #include_str, #include_bin
9358 * Cargo automatically resolves dependencies
9361 Version 0.2 (2012-03-29)
9362 =========================
9364 * >1500 changes, numerous bugfixes
9366 * New docs and doc tooling
9368 * New port: FreeBSD x86_64
9370 * Compilation model enhancements
9371 * Generics now specialized, multiply instantiated
9372 * Functions now inlined across separate crates
9374 * Scheduling, stack and threading fixes
9375 * Noticeably improved message-passing performance
9376 * Explicit schedulers
9380 * Experimental new language features
9381 * Operator overloading
9385 * Various language extensions
9386 * C-callback function types: 'crust fn ...'
9387 * Infinite-loop construct: 'loop { ... }'
9388 * Shorten 'mutable' to 'mut'
9389 * Required mutable-local qualifier: 'let mut ...'
9390 * Basic glob-exporting: 'export foo::*;'
9391 * Alt now exhaustive, 'alt check' for runtime-checked
9392 * Block-function form of 'for' loop, with 'break' and 'ret'.
9395 * AST quasi-quote syntax extension
9396 * Revived libuv interface
9397 * New modules: core::{future, iter}, std::arena
9398 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9399 * Extensive cleanup, regularization in libstd, libcore
9402 Version 0.1 (2012-01-20)
9403 ===============================
9405 * Most language features work, including:
9406 * Unique pointers, unique closures, move semantics
9407 * Interface-constrained generics
9408 * Static interface dispatch
9410 * Multithread task scheduling
9411 * Typestate predicates
9412 * Failure unwinding, destructors
9413 * Pattern matching and destructuring assignment
9414 * Lightweight block-lambda syntax
9415 * Preliminary macro-by-example
9417 * Compiler works with the following configurations:
9418 * Linux: x86 and x86_64 hosts and targets
9419 * macOS: x86 and x86_64 hosts and targets
9420 * Windows: x86 hosts and targets
9422 * Cross compilation / multi-target configuration supported.
9424 * Preliminary API-documentation and package-management tools included.
9428 * Documentation is incomplete.
9430 * Performance is below intended target.
9432 * Standard library APIs are subject to extensive change, reorganization.
9434 * Language-level versioning is not yet operational - future code will