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]
426 \* Refer to Rust's [platform support page][forge-platform-support] for more
427 information on Rust's tiered platform support.
432 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
434 - [`proc_macro::TokenStream` now implements `Default`.][72234]
435 - [You can now use `char` with
436 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
437 a range of codepoints.][72413] E.g.
438 you can now write the following;
440 for ch in 'a'..='z' {
444 // Prints "abcdefghijklmnopqrstuvwxyz"
446 - [`OsString` now implements `FromStr`.][71662]
447 - [The `saturating_neg` method has been added to all signed integer primitive
448 types, and the `saturating_abs` method has been added for all integer
449 primitive types.][71886]
450 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
451 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
453 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
454 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
455 integer types.][69813]
456 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
457 integer types.][72324]
458 - [The `fetch_update` method has been added to all atomic integer types.][71843]
463 - [`BTreeMap::remove_entry`]
465 - [`rc::Weak::as_ptr`]
466 - [`rc::Weak::from_raw`]
467 - [`rc::Weak::into_raw`]
468 - [`str::strip_prefix`]
469 - [`str::strip_suffix`]
470 - [`sync::Weak::as_ptr`]
471 - [`sync::Weak::from_raw`]
472 - [`sync::Weak::into_raw`]
473 - [`char::UNICODE_VERSION`]
474 - [`Span::resolved_at`]
475 - [`Span::located_at`]
476 - [`Span::mixed_site`]
477 - [`unix::process::CommandExt::arg0`]
482 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
487 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
488 `~~outdated information~~` becomes "~~outdated information~~".
489 - [Added an emoji to Rustdoc's deprecated API message.][72014]
493 - [Trying to self initialize a static value (that is creating a value using
494 itself) is unsound and now causes a compile error.][71140]
495 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
496 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
497 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
498 previously undocumented and not intended for public use. Rustdoc still provides
499 a non-zero exit code on errors.
500 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
501 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
502 flags while cargo is adding `embed-bitcode` itself. The recommended way to
503 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
504 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
508 - [Make clippy a git subtree instead of a git submodule][70655]
509 - [Unify the undo log of all snapshot types][69464]
511 [71848]: https://github.com/rust-lang/rust/issues/71848/
512 [73420]: https://github.com/rust-lang/rust/issues/73420/
513 [72324]: https://github.com/rust-lang/rust/pull/72324/
514 [71843]: https://github.com/rust-lang/rust/pull/71843/
515 [71886]: https://github.com/rust-lang/rust/pull/71886/
516 [72234]: https://github.com/rust-lang/rust/pull/72234/
517 [72239]: https://github.com/rust-lang/rust/pull/72239/
518 [72397]: https://github.com/rust-lang/rust/pull/72397/
519 [72413]: https://github.com/rust-lang/rust/pull/72413/
520 [72014]: https://github.com/rust-lang/rust/pull/72014/
521 [72062]: https://github.com/rust-lang/rust/pull/72062/
522 [72094]: https://github.com/rust-lang/rust/pull/72094/
523 [72133]: https://github.com/rust-lang/rust/pull/72133/
524 [71900]: https://github.com/rust-lang/rust/pull/71900/
525 [71928]: https://github.com/rust-lang/rust/pull/71928/
526 [71662]: https://github.com/rust-lang/rust/pull/71662/
527 [71716]: https://github.com/rust-lang/rust/pull/71716/
528 [71447]: https://github.com/rust-lang/rust/pull/71447/
529 [71269]: https://github.com/rust-lang/rust/pull/71269/
530 [71095]: https://github.com/rust-lang/rust/pull/71095/
531 [71140]: https://github.com/rust-lang/rust/pull/71140/
532 [70655]: https://github.com/rust-lang/rust/pull/70655/
533 [70705]: https://github.com/rust-lang/rust/pull/70705/
534 [69984]: https://github.com/rust-lang/rust/pull/69984/
535 [69813]: https://github.com/rust-lang/rust/pull/69813/
536 [69464]: https://github.com/rust-lang/rust/pull/69464/
537 [68717]: https://github.com/rust-lang/rust/pull/68717/
538 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
539 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
540 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
541 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
542 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
543 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
544 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
545 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
546 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
547 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
548 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
549 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
550 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
551 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
552 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
553 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
554 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
557 Version 1.44.1 (2020-06-18)
558 ===========================
560 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
561 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
562 * [Fix crashes when finding backtrace on macOS.][71397]
563 * [Clippy applies lint levels into different files.][clippy/5356]
565 [71397]: https://github.com/rust-lang/rust/issues/71397
566 [73078]: https://github.com/rust-lang/rust/issues/73078
567 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
568 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
571 Version 1.44.0 (2020-06-04)
572 ==========================
576 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
577 - [Added the `unused_braces` lint.][70081]
579 **Syntax-only changes**
581 - [Expansion-driven outline module parsing][69838]
586 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
591 These are still rejected semantically, so you will likely receive an error but
592 these changes can be seen and parsed by macros and conditional compilation.
596 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
597 Additionally when in incremental mode rustc defaults to 256 codegen units.
598 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
599 a panic is thrown.][67502]
600 - [Added tier 3\* support for the `aarch64-unknown-none` and
601 `aarch64-unknown-none-softfloat` targets.][68334]
602 - [Added tier 3 support for `arm64-apple-tvos` and
603 `x86_64-apple-tvos` targets.][68191]
608 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
609 `vec![]` to be able to be used in `const` contexts.
610 - [`convert::Infallible` now implements `Hash`.][70281]
611 - [`OsString` now implements `DerefMut` and `IndexMut` returning
612 a `&mut OsStr`.][70048]
613 - [Unicode 13 is now supported.][69929]
614 - [`String` now implements `From<&mut str>`.][69661]
615 - [`IoSlice` now implements `Copy`.][69403]
616 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
617 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
618 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
619 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
620 integer types.][69373]
624 - [`PathBuf::with_capacity`]
625 - [`PathBuf::capacity`]
627 - [`PathBuf::reserve`]
628 - [`PathBuf::reserve_exact`]
629 - [`PathBuf::shrink_to_fit`]
630 - [`f32::to_int_unchecked`]
631 - [`f64::to_int_unchecked`]
632 - [`Layout::align_to`]
633 - [`Layout::pad_to_align`]
639 - [Added the `cargo tree` command which will print a tree graph of
640 your dependencies.][cargo/8062] E.g.
642 mdbook v0.3.2 (/Users/src/rust/mdbook)
644 │ ├── html5ever v0.24.0
646 │ │ │ └── cfg-if v0.1.9
648 │ │ └── markup5ever v0.9.0
649 │ │ ├── log v0.4.8 (*)
651 │ │ │ └── phf_shared v0.7.24
652 │ │ │ ├── siphasher v0.2.3
653 │ │ │ └── unicase v1.4.2
654 │ │ │ [build-dependencies]
655 │ │ │ └── version_check v0.1.5
658 You can also display dependencies on multiple versions of the same crate with
659 `cargo tree -d` (short for `cargo tree --duplicates`).
663 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
664 the version in the sidebar.][69494]
668 - [Rustc now correctly generates static libraries on Windows GNU targets with
669 the `.a` extension, rather than the previous `.lib`.][70937]
670 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
671 - [The `file_name` property in JSON output of macro errors now points the actual
672 source file rather than the previous format of `<NAME macros>`.][70969]
673 **Note:** this may not point to a file that actually exists on the user's system.
674 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
675 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
676 not allow zero initialization such as `NonZeroU8`.][66059] This was
677 previously a warning.
678 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
679 operator has been defined as a saturating operation.][71269] This was previously
680 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
681 continue using the current behaviour, which may be desirable in rare performance
682 sensitive situations.
686 These changes provide no direct user facing benefits, but represent significant
687 improvements to the internals and overall performance of rustc and
690 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
691 - [Replace big JS dict with JSON parsing.][71250]
693 [69373]: https://github.com/rust-lang/rust/pull/69373/
694 [66059]: https://github.com/rust-lang/rust/pull/66059/
695 [68191]: https://github.com/rust-lang/rust/pull/68191/
696 [68899]: https://github.com/rust-lang/rust/pull/68899/
697 [71147]: https://github.com/rust-lang/rust/pull/71147/
698 [71250]: https://github.com/rust-lang/rust/pull/71250/
699 [70937]: https://github.com/rust-lang/rust/pull/70937/
700 [70969]: https://github.com/rust-lang/rust/pull/70969/
701 [70632]: https://github.com/rust-lang/rust/pull/70632/
702 [70281]: https://github.com/rust-lang/rust/pull/70281/
703 [70345]: https://github.com/rust-lang/rust/pull/70345/
704 [70048]: https://github.com/rust-lang/rust/pull/70048/
705 [70081]: https://github.com/rust-lang/rust/pull/70081/
706 [70156]: https://github.com/rust-lang/rust/pull/70156/
707 [71269]: https://github.com/rust-lang/rust/pull/71269/
708 [69838]: https://github.com/rust-lang/rust/pull/69838/
709 [69929]: https://github.com/rust-lang/rust/pull/69929/
710 [69661]: https://github.com/rust-lang/rust/pull/69661/
711 [69778]: https://github.com/rust-lang/rust/pull/69778/
712 [69494]: https://github.com/rust-lang/rust/pull/69494/
713 [69403]: https://github.com/rust-lang/rust/pull/69403/
714 [69033]: https://github.com/rust-lang/rust/pull/69033/
715 [68692]: https://github.com/rust-lang/rust/pull/68692/
716 [68334]: https://github.com/rust-lang/rust/pull/68334/
717 [67502]: https://github.com/rust-lang/rust/pull/67502/
718 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
719 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
720 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
721 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
722 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
723 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
724 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
725 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
726 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
727 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
728 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
729 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
730 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
733 Version 1.43.1 (2020-05-07)
734 ===========================
736 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
737 * [Fixed the stabilization of AVX-512 features.][71473]
738 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
740 [71430]: https://github.com/rust-lang/rust/pull/71430
741 [71473]: https://github.com/rust-lang/rust/issues/71473
742 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
745 Version 1.43.0 (2020-04-23)
746 ==========================
750 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
751 the type inferred correctly.][68129]
752 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
754 **Syntax only changes**
755 - [Allow `type Foo: Ord` syntactically.][69361]
756 - [Fuse associated and extern items up to defaultness.][69194]
757 - [Syntactically allow `self` in all `fn` contexts.][68764]
758 - [Merge `fn` syntax + cleanup item parsing.][68728]
759 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
760 For example, you may now write:
762 macro_rules! mac_trait {
772 These are still rejected *semantically*, so you will likely receive an error but
773 these changes can be seen and parsed by macros and
774 conditional compilation.
779 - [You can now pass multiple lint flags to rustc to override the previous
780 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
781 everything in the `unused` lint group except `unused-variables` which
782 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
783 everything in the `unused` lint group **including** `unused-variables` since
784 the allow flag is specified before the deny flag (and therefore overridden).
785 - [rustc will now prefer your system MinGW libraries over its bundled libraries
786 if they are available on `windows-gnu`.][67429]
787 - [rustc now buffers errors/warnings printed in JSON.][69227]
791 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
792 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
793 respectively.][69538] **Note** These conversions are only available when `N`
795 - [You can now use associated constants on floats and integers directly, rather
796 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
797 `f32::NAN` with no imports.
798 - [`u8::is_ascii` is now `const`.][68984]
799 - [`String` now implements `AsMut<str>`.][68742]
800 - [Added the `primitive` module to `std` and `core`.][67637] This module
801 reexports Rust's primitive types. This is mainly useful in macros
802 where you want avoid these types being shadowed.
803 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
804 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
808 - [`Once::is_completed`]
813 - [`iter::once_with`]
817 - [You can now set config `[profile]`s in your `.cargo/config`, or through
818 your environment.][cargo/7823]
819 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
820 executable path when running integration tests or benchmarks.][cargo/7697]
821 `<name>` is the name of your binary as-is e.g. If you wanted the executable
822 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
826 - [Certain checks in the `const_err` lint were deemed unrelated to const
827 evaluation][69185], and have been moved to the `unconditional_panic` and
828 `arithmetic_overflow` lints.
833 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
834 has been a warning since 1.36.0.
835 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
836 led to some instances being accepted, and now correctly emits a hard error.
838 [69340]: https://github.com/rust-lang/rust/pull/69340
842 These changes provide no direct user facing benefits, but represent significant
843 improvements to the internals and overall performance of `rustc` and
846 - [All components are now built with `opt-level=3` instead of `2`.][67878]
847 - [Improved how rustc generates drop code.][67332]
848 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
849 - [traits: preallocate 2 Vecs of known initial size][69022]
850 - [Avoid exponential behaviour when relating types][68772]
851 - [Skip `Drop` terminators for enum variants without drop glue][68943]
852 - [Improve performance of coherence checks][68966]
853 - [Deduplicate types in the generator witness][68672]
854 - [Invert control in struct_lint_level.][68725]
856 [67332]: https://github.com/rust-lang/rust/pull/67332/
857 [67429]: https://github.com/rust-lang/rust/pull/67429/
858 [67637]: https://github.com/rust-lang/rust/pull/67637/
859 [67642]: https://github.com/rust-lang/rust/pull/67642/
860 [67878]: https://github.com/rust-lang/rust/pull/67878/
861 [67885]: https://github.com/rust-lang/rust/pull/67885/
862 [68129]: https://github.com/rust-lang/rust/pull/68129/
863 [68672]: https://github.com/rust-lang/rust/pull/68672/
864 [68725]: https://github.com/rust-lang/rust/pull/68725/
865 [68728]: https://github.com/rust-lang/rust/pull/68728/
866 [68738]: https://github.com/rust-lang/rust/pull/68738/
867 [68742]: https://github.com/rust-lang/rust/pull/68742/
868 [68764]: https://github.com/rust-lang/rust/pull/68764/
869 [68772]: https://github.com/rust-lang/rust/pull/68772/
870 [68943]: https://github.com/rust-lang/rust/pull/68943/
871 [68952]: https://github.com/rust-lang/rust/pull/68952/
872 [68966]: https://github.com/rust-lang/rust/pull/68966/
873 [68984]: https://github.com/rust-lang/rust/pull/68984/
874 [69022]: https://github.com/rust-lang/rust/pull/69022/
875 [69185]: https://github.com/rust-lang/rust/pull/69185/
876 [69194]: https://github.com/rust-lang/rust/pull/69194/
877 [69201]: https://github.com/rust-lang/rust/pull/69201/
878 [69227]: https://github.com/rust-lang/rust/pull/69227/
879 [69548]: https://github.com/rust-lang/rust/pull/69548/
880 [69256]: https://github.com/rust-lang/rust/pull/69256/
881 [69361]: https://github.com/rust-lang/rust/pull/69361/
882 [69366]: https://github.com/rust-lang/rust/pull/69366/
883 [69538]: https://github.com/rust-lang/rust/pull/69538/
884 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
885 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
886 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
887 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
888 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
889 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
890 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
891 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
894 Version 1.42.0 (2020-03-12)
895 ==========================
899 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
901 fn foo(words: &[&str]) {
903 ["Hello", "World", "!", ..] => println!("Hello World!"),
904 ["Foo", "Bar", ..] => println!("Baz"),
905 rest => println!("{:?}", rest),
909 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
910 that you can create an enum that has the exact layout and ABI of the type
912 - [There are some *syntax-only* changes:][67131]
913 - `default` is syntactically allowed before items in `trait` definitions.
914 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
915 leave out their bodies in favor of `;`.
916 - Bounds on associated types in `impl`s are now syntactically allowed
917 (e.g. `type Foo: Ord;`).
918 - `...` (the C-variadic type) may occur syntactically directly as the type of
919 any function parameter.
921 These are still rejected *semantically*, so you will likely receive an error
922 but these changes can be seen and parsed by procedural macros and
923 conditional compilation.
927 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
928 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
929 - [`Option::{expect,unwrap}` and
930 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
931 pointing to the location where they were called, rather than
932 `core`'s internals. ][67887]
934 \* Refer to Rust's [platform support page][forge-platform-support] for more
935 information on Rust's tiered platform support.
939 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
940 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
941 to implement `Sized`.][67935]
942 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
943 - [`Layout::new` is now `const`.][66254]
944 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
949 - [`CondVar::wait_while`]
950 - [`CondVar::wait_timeout_while`]
952 - [`DebugMap::value`]
953 - [`ManuallyDrop::take`]
955 - [`ptr::slice_from_raw_parts_mut`]
956 - [`ptr::slice_from_raw_parts`]
960 - [You no longer need to include `extern crate proc_macro;` to be able to
961 `use proc_macro;` in the `2018` edition.][cargo/7700]
965 - [`Error::description` has been deprecated, and its use will now produce a
966 warning.][66919] It's recommended to use `Display`/`to_string` instead.
968 [68253]: https://github.com/rust-lang/rust/pull/68253/
969 [68348]: https://github.com/rust-lang/rust/pull/68348/
970 [67935]: https://github.com/rust-lang/rust/pull/67935/
971 [68339]: https://github.com/rust-lang/rust/pull/68339/
972 [68122]: https://github.com/rust-lang/rust/pull/68122/
973 [67712]: https://github.com/rust-lang/rust/pull/67712/
974 [67887]: https://github.com/rust-lang/rust/pull/67887/
975 [67131]: https://github.com/rust-lang/rust/pull/67131/
976 [67233]: https://github.com/rust-lang/rust/pull/67233/
977 [66899]: https://github.com/rust-lang/rust/pull/66899/
978 [66919]: https://github.com/rust-lang/rust/pull/66919/
979 [66254]: https://github.com/rust-lang/rust/pull/66254/
980 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
981 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
982 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
983 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
984 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
985 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
986 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
987 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
988 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
991 Version 1.41.1 (2020-02-27)
992 ===========================
994 * [Always check types of static items][69145]
995 * [Always check lifetime bounds of `Copy` impls][69145]
996 * [Fix miscompilation in callers of `Layout::repeat`][69225]
998 [69225]: https://github.com/rust-lang/rust/issues/69225
999 [69145]: https://github.com/rust-lang/rust/pull/69145
1002 Version 1.41.0 (2020-01-30)
1003 ===========================
1008 - [You can now pass type parameters to foreign items when implementing
1009 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1010 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1011 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1012 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1013 - [You can now use any valid identifier in a `format_args` macro.][66847]
1014 Previously identifiers starting with an underscore were not allowed.
1015 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1016 enum variants.][66183] These are still rejected semantically, but
1017 can be seen and parsed by procedural macros and conditional compilation.
1022 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1023 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1024 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1025 - [You can now pass an arguments file passing the `@path` syntax
1026 to rustc.][66172] Note that the format differs somewhat from what is
1027 found in other tooling; please see [the documentation][argfile-docs] for
1029 - [You can now provide `--extern` flag without a path, indicating that it is
1030 available from the search path or specified with an `-L` flag.][64882]
1032 \* Refer to Rust's [platform support page][forge-platform-support] for more
1033 information on Rust's tiered platform support.
1035 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1040 - [The `core::panic` module is now stable.][66771] It was already stable
1042 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1043 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1044 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1049 - [`Result::map_or`]
1050 - [`Result::map_or_else`]
1051 - [`std::rc::Weak::weak_count`]
1052 - [`std::rc::Weak::strong_count`]
1053 - [`std::sync::Weak::weak_count`]
1054 - [`std::sync::Weak::strong_count`]
1059 - [Cargo will now document all the private items for binary crates
1060 by default.][cargo/7593]
1061 - [`cargo-install` will now reinstall the package if it detects that it is out
1062 of date.][cargo/7560]
1063 - [Cargo.lock now uses a more git friendly format that should help to reduce
1064 merge conflicts.][cargo/7579]
1065 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1066 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1067 optimisation level to `2` for debug builds. You can also use
1068 `[profile.<profile>.build-override]` to override build scripts and
1074 - [You can now specify `edition` in documentation code blocks to compile the block
1075 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1076 should be compiled the 2018 edition of Rust.
1077 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1078 current theme with `--check-theme`.][54733]
1079 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1084 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1085 Apple targets.][apple-32bit-drop] This means that the source code is still
1086 available to build, but the targets are no longer being tested and release
1087 binaries for those platforms will no longer be distributed by the Rust project.
1088 Please refer to the linked blog post for more information.
1090 [54733]: https://github.com/rust-lang/rust/pull/54733/
1091 [61351]: https://github.com/rust-lang/rust/pull/61351/
1092 [67255]: https://github.com/rust-lang/rust/pull/67255/
1093 [66661]: https://github.com/rust-lang/rust/pull/66661/
1094 [66771]: https://github.com/rust-lang/rust/pull/66771/
1095 [66847]: https://github.com/rust-lang/rust/pull/66847/
1096 [66238]: https://github.com/rust-lang/rust/pull/66238/
1097 [66277]: https://github.com/rust-lang/rust/pull/66277/
1098 [66325]: https://github.com/rust-lang/rust/pull/66325/
1099 [66172]: https://github.com/rust-lang/rust/pull/66172/
1100 [66183]: https://github.com/rust-lang/rust/pull/66183/
1101 [65879]: https://github.com/rust-lang/rust/pull/65879/
1102 [65013]: https://github.com/rust-lang/rust/pull/65013/
1103 [64882]: https://github.com/rust-lang/rust/pull/64882/
1104 [64325]: https://github.com/rust-lang/rust/pull/64325/
1105 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1106 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1107 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1108 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1109 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1110 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1111 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1112 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1113 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1114 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1115 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1117 Version 1.40.0 (2019-12-19)
1118 ===========================
1122 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1123 `const` contexts.][65188] e.g.
1126 pub struct Point(i32, i32);
1128 const ORIGIN: Point = {
1129 let constructor = Point;
1135 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1136 indicate that there may be variants or fields added in the future.][64639]
1137 For example this requires adding a wild-card branch (`_ => {}`) to any match
1138 statements on a non-exhaustive `enum`. [(RFC 2008)]
1139 - [You can now use function-like procedural macros in `extern` blocks and in
1140 type positions.][63931] e.g. `type Generated = macro!();`
1141 - [Function-like and attribute procedural macros can now emit
1142 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1143 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1144 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1145 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1149 - [Added tier 3 support\* for the
1150 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1151 - [Added tier 3 support for the
1152 `aarch64-unknown-none-softfloat` target.][64589]
1153 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1154 `mips64el-unknown-linux-muslabi64` targets.][65843]
1156 \* Refer to Rust's [platform support page][forge-platform-support] for more
1157 information on Rust's tiered platform support.
1161 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1165 - [`BTreeMap::get_key_value`]
1166 - [`HashMap::get_key_value`]
1167 - [`Option::as_deref_mut`]
1168 - [`Option::as_deref`]
1169 - [`Option::flatten`]
1170 - [`UdpSocket::peer_addr`]
1171 - [`f32::to_be_bytes`]
1172 - [`f32::to_le_bytes`]
1173 - [`f32::to_ne_bytes`]
1174 - [`f64::to_be_bytes`]
1175 - [`f64::to_le_bytes`]
1176 - [`f64::to_ne_bytes`]
1177 - [`f32::from_be_bytes`]
1178 - [`f32::from_le_bytes`]
1179 - [`f32::from_ne_bytes`]
1180 - [`f64::from_be_bytes`]
1181 - [`f64::from_le_bytes`]
1182 - [`f64::from_ne_bytes`]
1189 - [Cargo will now always display warnings, rather than only on
1190 fresh builds.][cargo/7450]
1191 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1192 now produce an error.][cargo/7507] Previously these flags were ignored.
1193 - [You can now publish `dev-dependencies` without including
1194 a `version`.][cargo/7333]
1198 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1199 when running documentation tests with `rustdoc`.][63803]
1203 - [As previously announced, any previous NLL warnings in the 2015 edition are
1204 now hard errors.][64221]
1205 - [The `include!` macro will now warn if it failed to include the
1206 entire file.][64284] The `include!` macro unintentionally only includes the
1207 first _expression_ in a file, and this can be unintuitive. This will become
1208 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1209 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1210 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1211 or `extern` blocks now correctly emits a hard error.
1213 [65294]: https://github.com/rust-lang/rust/pull/65294/
1214 [66103]: https://github.com/rust-lang/rust/pull/66103/
1215 [65843]: https://github.com/rust-lang/rust/pull/65843/
1216 [65188]: https://github.com/rust-lang/rust/pull/65188/
1217 [65092]: https://github.com/rust-lang/rust/pull/65092/
1218 [64589]: https://github.com/rust-lang/rust/pull/64589/
1219 [64639]: https://github.com/rust-lang/rust/pull/64639/
1220 [64221]: https://github.com/rust-lang/rust/pull/64221/
1221 [64284]: https://github.com/rust-lang/rust/pull/64284/
1222 [63931]: https://github.com/rust-lang/rust/pull/63931/
1223 [64035]: https://github.com/rust-lang/rust/pull/64035/
1224 [63674]: https://github.com/rust-lang/rust/pull/63674/
1225 [63803]: https://github.com/rust-lang/rust/pull/63803/
1226 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1227 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1228 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1229 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1230 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1231 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1232 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1233 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1234 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1235 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1236 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1237 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1238 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1239 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1240 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1241 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1242 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1243 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1244 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1245 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1246 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1247 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1248 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1249 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1250 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1251 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1254 Version 1.39.0 (2019-11-07)
1255 ===========================
1259 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1260 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1261 - [You can now use certain attributes on function, closure, and function pointer
1262 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1263 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1264 attributes applied to items. e.g.
1267 #[cfg(windows)] slice: &[u16],
1268 #[cfg(not(windows))] slice: &[u8],
1273 - [You can now take shared references to bind-by-move patterns in the `if` guards
1274 of `match` arms.][63118] e.g.
1277 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1281 // ---- `nums` is bound by move.
1282 if nums.iter().sum::<u8>() == 10
1283 // ^------ `.iter()` implicitly takes a reference to `nums`.
1286 // ----------- Legal as `nums` was bound by move and so we have ownership.
1288 _ => unreachable!(),
1297 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1298 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1299 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1300 **Note** Cargo currently doesn't use this feature. Refer to
1301 [cargo#7315][cargo/7315] to track this feature's progress.
1302 - [You can now pass `--show-output` argument to test binaries to print the
1303 output of successful tests.][62600]
1306 \* Refer to Rust's [platform support page][forge-platform-support] for more
1307 information on Rust's tiered platform support.
1311 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1312 - [`LinkedList::new` is now a `const` function.][63684]
1313 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1314 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1315 now `const`.][63786]
1319 - [`Pin::into_inner`]
1320 - [`Instant::checked_duration_since`]
1321 - [`Instant::saturating_duration_since`]
1325 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1326 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1327 `--all` is now deprecated.
1331 - [You can now pass `-Clinker` to rustdoc to control the linker used
1332 for compiling doctests.][63834]
1336 - [Code that was previously accepted by the old borrow checker, but rejected by
1337 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1338 previously a warning, and will also become a hard error in the Rust 2015
1339 edition in the 1.40.0 release.
1340 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1341 run tests.][63827] This should improve performance when running a large
1343 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1344 recommended to use the `?` operator instead.
1345 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1348 [62600]: https://github.com/rust-lang/rust/pull/62600/
1349 [62672]: https://github.com/rust-lang/rust/pull/62672/
1350 [63118]: https://github.com/rust-lang/rust/pull/63118/
1351 [63209]: https://github.com/rust-lang/rust/pull/63209/
1352 [63402]: https://github.com/rust-lang/rust/pull/63402/
1353 [63565]: https://github.com/rust-lang/rust/pull/63565/
1354 [63595]: https://github.com/rust-lang/rust/pull/63595/
1355 [63684]: https://github.com/rust-lang/rust/pull/63684/
1356 [63698]: https://github.com/rust-lang/rust/pull/63698/
1357 [63770]: https://github.com/rust-lang/rust/pull/63770/
1358 [63786]: https://github.com/rust-lang/rust/pull/63786/
1359 [63827]: https://github.com/rust-lang/rust/pull/63827/
1360 [63834]: https://github.com/rust-lang/rust/pull/63834/
1361 [63927]: https://github.com/rust-lang/rust/pull/63927/
1362 [63933]: https://github.com/rust-lang/rust/pull/63933/
1363 [63934]: https://github.com/rust-lang/rust/pull/63934/
1364 [63938]: https://github.com/rust-lang/rust/pull/63938/
1365 [63940]: https://github.com/rust-lang/rust/pull/63940/
1366 [63941]: https://github.com/rust-lang/rust/pull/63941/
1367 [63945]: https://github.com/rust-lang/rust/pull/63945/
1368 [64010]: https://github.com/rust-lang/rust/pull/64010/
1369 [64028]: https://github.com/rust-lang/rust/pull/64028/
1370 [64334]: https://github.com/rust-lang/rust/pull/64334/
1371 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1372 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1373 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1374 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1375 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1376 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1378 Version 1.38.0 (2019-09-26)
1379 ==========================
1383 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1384 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1388 - [Added pipelined compilation support to `rustc`.][62766] This will
1389 improve compilation times in some cases. For further information please refer
1390 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1391 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1392 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1393 `x86_64-uwp-windows-msvc` targets.][60260]
1394 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1395 `armv7-unknown-linux-musleabi` targets.][63107]
1396 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1397 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1399 \* Refer to Rust's [platform support page][forge-platform-support] for more
1400 information on Rust's tiered platform support.
1404 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1405 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1406 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1407 is available at `std::clone::Clone`). This also makes all built-in macros
1408 available in `std`/`core` root. e.g. `std::include_bytes!`.
1409 - [`str::Chars` now implements `Debug`.][63000]
1410 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1411 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1412 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1413 - [Added euclidean remainder and division operations (`div_euclid`,
1414 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1415 `overflowing`, and `wrapping` versions are available for all
1417 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1418 `PartialEq`.][61491]
1419 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1423 - [`<*const T>::cast`]
1424 - [`<*mut T>::cast`]
1425 - [`Duration::as_secs_f32`]
1426 - [`Duration::as_secs_f64`]
1427 - [`Duration::div_f32`]
1428 - [`Duration::div_f64`]
1429 - [`Duration::from_secs_f32`]
1430 - [`Duration::from_secs_f64`]
1431 - [`Duration::mul_f32`]
1432 - [`Duration::mul_f64`]
1433 - [`any::type_name`]
1437 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1438 - [You can now pass the `--features` option multiple times to enable
1439 multiple features.][cargo/7084]
1443 - [`rustc` will now warn about some incorrect uses of
1444 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1448 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1450 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1451 issues][62896] with certain crates such as libc.
1453 [60260]: https://github.com/rust-lang/rust/pull/60260/
1454 [61457]: https://github.com/rust-lang/rust/pull/61457/
1455 [61491]: https://github.com/rust-lang/rust/pull/61491/
1456 [61884]: https://github.com/rust-lang/rust/pull/61884/
1457 [61953]: https://github.com/rust-lang/rust/pull/61953/
1458 [62042]: https://github.com/rust-lang/rust/pull/62042/
1459 [62528]: https://github.com/rust-lang/rust/pull/62528/
1460 [62583]: https://github.com/rust-lang/rust/pull/62583/
1461 [62735]: https://github.com/rust-lang/rust/pull/62735/
1462 [62766]: https://github.com/rust-lang/rust/pull/62766/
1463 [62784]: https://github.com/rust-lang/rust/pull/62784/
1464 [62785]: https://github.com/rust-lang/rust/issues/62785/
1465 [62814]: https://github.com/rust-lang/rust/pull/62814/
1466 [62896]: https://github.com/rust-lang/rust/issues/62896/
1467 [63000]: https://github.com/rust-lang/rust/pull/63000/
1468 [63056]: https://github.com/rust-lang/rust/pull/63056/
1469 [63107]: https://github.com/rust-lang/rust/pull/63107/
1470 [63346]: https://github.com/rust-lang/rust/pull/63346/
1471 [63421]: https://github.com/rust-lang/rust/pull/63421/
1472 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1473 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1474 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1475 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1476 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1477 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1478 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1479 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1480 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1481 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1482 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1483 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1484 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1485 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1486 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1488 Version 1.37.0 (2019-08-15)
1489 ==========================
1493 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1494 [`Box`][62228], or an [array][62235] and unused.
1495 - [You can now use the `cfg` and `cfg_attr` attributes on
1496 generic parameters.][61547]
1497 - [You can now use enum variants through type alias.][61682] e.g. You can
1498 write the following:
1500 type MyOption = Option<u8>;
1502 fn increment_or_zero(x: MyOption) -> u8 {
1504 MyOption::Some(y) => y + 1,
1505 MyOption::None => 0,
1509 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1510 `const _: u32 = 5;`.
1511 - [You can now use `#[repr(align(X)]` on enums.][61229]
1512 - [The `?` Kleene macro operator is now available in the
1513 2015 edition.][60932]
1517 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1518 and `-C profile-use` flags.][61268] For more information on how to use profile
1519 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1520 - [The `rust-lldb` wrapper script should now work again.][61827]
1524 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1528 - [`BufReader::buffer`]
1529 - [`BufWriter::buffer`]
1530 - [`Cell::from_mut`]
1531 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1532 - [`DoubleEndedIterator::nth_back`]
1534 - [`Wrapping::reverse_bits`]
1535 - [`i128::reverse_bits`]
1536 - [`i16::reverse_bits`]
1537 - [`i32::reverse_bits`]
1538 - [`i64::reverse_bits`]
1539 - [`i8::reverse_bits`]
1540 - [`isize::reverse_bits`]
1541 - [`slice::copy_within`]
1542 - [`u128::reverse_bits`]
1543 - [`u16::reverse_bits`]
1544 - [`u32::reverse_bits`]
1545 - [`u64::reverse_bits`]
1546 - [`u8::reverse_bits`]
1547 - [`usize::reverse_bits`]
1551 - [`Cargo.lock` files are now included by default when publishing executable crates
1552 with executables.][cargo/7026]
1553 - [You can now specify `default-run="foo"` in `[package]` to specify the
1554 default executable to use for `cargo run`.][cargo/7056]
1561 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1562 Please transition your code to using the `..=` syntax for inclusive
1564 - [Using a trait object without the `dyn` will now warn by default.][61203]
1565 Please transition your code to use `dyn Trait` for trait objects instead.
1567 [62228]: https://github.com/rust-lang/rust/pull/62228/
1568 [62235]: https://github.com/rust-lang/rust/pull/62235/
1569 [61802]: https://github.com/rust-lang/rust/pull/61802/
1570 [61827]: https://github.com/rust-lang/rust/pull/61827/
1571 [61547]: https://github.com/rust-lang/rust/pull/61547/
1572 [61682]: https://github.com/rust-lang/rust/pull/61682/
1573 [61268]: https://github.com/rust-lang/rust/pull/61268/
1574 [61342]: https://github.com/rust-lang/rust/pull/61342/
1575 [61347]: https://github.com/rust-lang/rust/pull/61347/
1576 [61100]: https://github.com/rust-lang/rust/pull/61100/
1577 [61203]: https://github.com/rust-lang/rust/pull/61203/
1578 [61229]: https://github.com/rust-lang/rust/pull/61229/
1579 [60932]: https://github.com/rust-lang/rust/pull/60932/
1580 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1581 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1582 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1583 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1584 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1585 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1586 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1587 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1588 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1589 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1590 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1591 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1592 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1593 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1594 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1595 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1596 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1597 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1598 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1599 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1600 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1601 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1602 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1603 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1606 Version 1.36.0 (2019-07-04)
1607 ==========================
1611 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1612 - [The order of traits in trait objects no longer affects the semantics of that
1613 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1614 `dyn fmt::Debug + Send`, where this was previously not the case.
1618 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1619 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1620 - [`mem::needs_drop` is now available as a const fn.][60364]
1621 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1622 - [`String` now implements `BorrowMut<str>`.][60404]
1623 - [`io::Cursor` now implements `Default`.][60234]
1624 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1625 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1626 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1627 environment has access to heap memory allocation.
1628 - [`String` now implements `From<&String>`.][59825]
1629 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1630 return a tuple of each argument when there is multiple arguments.
1631 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1636 - [`VecDeque::rotate_left`]
1637 - [`VecDeque::rotate_right`]
1638 - [`Iterator::copied`]
1640 - [`io::IoSliceMut`]
1641 - [`Read::read_vectored`]
1642 - [`Write::write_vectored`]
1643 - [`str::as_mut_ptr`]
1644 - [`mem::MaybeUninit`]
1645 - [`pointer::align_offset`]
1646 - [`future::Future`]
1648 - [`task::RawWaker`]
1649 - [`task::RawWakerVTable`]
1655 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1656 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1658 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1662 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1669 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1670 longer recommended, and will be deprecated in 1.39.0.
1672 [60318]: https://github.com/rust-lang/rust/pull/60318/
1673 [60364]: https://github.com/rust-lang/rust/pull/60364/
1674 [60370]: https://github.com/rust-lang/rust/pull/60370/
1675 [60404]: https://github.com/rust-lang/rust/pull/60404/
1676 [60234]: https://github.com/rust-lang/rust/pull/60234/
1677 [60244]: https://github.com/rust-lang/rust/pull/60244/
1678 [58623]: https://github.com/rust-lang/rust/pull/58623/
1679 [59648]: https://github.com/rust-lang/rust/pull/59648/
1680 [59675]: https://github.com/rust-lang/rust/pull/59675/
1681 [59825]: https://github.com/rust-lang/rust/pull/59825/
1682 [59826]: https://github.com/rust-lang/rust/pull/59826/
1683 [59445]: https://github.com/rust-lang/rust/pull/59445/
1684 [59114]: https://github.com/rust-lang/rust/pull/59114/
1685 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1686 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1687 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1688 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1689 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1690 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1691 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1692 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1693 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1694 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1695 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1696 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1697 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1698 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1699 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1700 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1701 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1702 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1703 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1704 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1707 Version 1.35.0 (2019-05-23)
1708 ==========================
1712 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1713 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1714 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1716 unsafe fn call_unsafe(func: unsafe fn()) {
1721 unsafe { call_unsafe(|| {}); }
1728 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1729 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1730 - [Added the `wasm32-unknown-wasi` target.][59464]
1735 - [`Thread` will now show its ID in `Debug` output.][59460]
1736 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1737 - [`alloc::System` now implements `Default`.][59451]
1738 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1740 - [`char::{ToLowercase, ToUppercase}` now
1741 implement `ExactSizeIterator`.][58778]
1742 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1743 - [Removed the `Read` trait bounds
1744 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1745 - [You can now call the `dbg!` macro without any parameters to print the file
1746 and line where it is called.][57847]
1747 - [In place ASCII case conversions are now up to 4× faster.][59283]
1748 e.g. `str::make_ascii_lowercase`
1749 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1756 - [`RefCell::replace_with`]
1757 - [`RefCell::map_split`]
1759 - [`Range::contains`]
1760 - [`RangeFrom::contains`]
1761 - [`RangeTo::contains`]
1762 - [`RangeInclusive::contains`]
1763 - [`RangeToInclusive::contains`]
1764 - [`Option::copied`]
1768 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1769 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1774 - [The Rust toolchain is now available natively for musl based distros.][58575]
1776 [59460]: https://github.com/rust-lang/rust/pull/59460/
1777 [59464]: https://github.com/rust-lang/rust/pull/59464/
1778 [59500]: https://github.com/rust-lang/rust/pull/59500/
1779 [59512]: https://github.com/rust-lang/rust/pull/59512/
1780 [59580]: https://github.com/rust-lang/rust/pull/59580/
1781 [59283]: https://github.com/rust-lang/rust/pull/59283/
1782 [59451]: https://github.com/rust-lang/rust/pull/59451/
1783 [59076]: https://github.com/rust-lang/rust/pull/59076/
1784 [58778]: https://github.com/rust-lang/rust/pull/58778/
1785 [58717]: https://github.com/rust-lang/rust/pull/58717/
1786 [58369]: https://github.com/rust-lang/rust/pull/58369/
1787 [58423]: https://github.com/rust-lang/rust/pull/58423/
1788 [58080]: https://github.com/rust-lang/rust/pull/58080/
1789 [57847]: https://github.com/rust-lang/rust/pull/57847/
1790 [58575]: https://github.com/rust-lang/rust/pull/58575
1791 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1792 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1793 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1794 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1795 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1796 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1797 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1798 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1799 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1800 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1801 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1802 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1804 Version 1.34.2 (2019-05-14)
1805 ===========================
1807 * [Destabilize the `Error::type_id` function due to a security
1808 vulnerability][60785] ([CVE-2019-12083])
1810 [60785]: https://github.com/rust-lang/rust/pull/60785
1811 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1813 Version 1.34.1 (2019-04-25)
1814 ===========================
1816 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1817 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1818 * [Fix Clippy panic when checking some macros][clippy/3805]
1820 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1821 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1822 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1824 Version 1.34.0 (2019-04-11)
1825 ==========================
1829 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1830 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1832 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1833 `#[attr{}]` procedural macros.][57367]
1834 - [You can now write `extern crate self as foo;`][57407] to import your
1835 crate's root into the extern prelude.
1840 - [You can now target `riscv64imac-unknown-none-elf` and
1841 `riscv64gc-unknown-none-elf`.][58406]
1842 - [You can now enable linker plugin LTO optimisations with
1843 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1844 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1846 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1851 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1852 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1853 the `Hash` trait to create an iterator.
1854 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1855 methods.][58421] Most notably you no longer require the `Ord` trait to create
1857 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1858 for all numeric types.][58044]
1859 - [Indexing a `str` is now generic over all types that
1860 implement `SliceIndex<str>`.][57604]
1861 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1862 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1863 produce a warning if their returning type is unused.
1864 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1865 `overflowing_pow` are now available for all numeric types.][57873] These are
1866 equivalent to methods such as `wrapping_add` for the `pow` operation.
1874 * [`Error::type_id`]
1875 * [`atomic::AtomicI16`]
1876 * [`atomic::AtomicI32`]
1877 * [`atomic::AtomicI64`]
1878 * [`atomic::AtomicI8`]
1879 * [`atomic::AtomicU16`]
1880 * [`atomic::AtomicU32`]
1881 * [`atomic::AtomicU64`]
1882 * [`atomic::AtomicU8`]
1883 * [`convert::Infallible`]
1884 * [`convert::TryFrom`]
1885 * [`convert::TryInto`]
1887 * [`iter::successors`]
1888 * [`num::NonZeroI128`]
1889 * [`num::NonZeroI16`]
1890 * [`num::NonZeroI32`]
1891 * [`num::NonZeroI64`]
1892 * [`num::NonZeroI8`]
1893 * [`num::NonZeroIsize`]
1894 * [`slice::sort_by_cached_key`]
1895 * [`str::escape_debug`]
1896 * [`str::escape_default`]
1897 * [`str::escape_unicode`]
1898 * [`str::split_ascii_whitespace`]
1901 * [`Instant::checked_add`]
1902 * [`Instant::checked_sub`]
1903 * [`SystemTime::checked_add`]
1904 * [`SystemTime::checked_sub`]
1908 - [You can now use alternative registries to crates.io.][cargo/6654]
1912 - [You can now use the `?` operator in your documentation tests without manually
1913 adding `fn main() -> Result<(), _> {}`.][56470]
1917 - [`Command::before_exec` is being replaced by the unsafe method
1918 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1919 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1920 can now use `const` functions in `static` variables.
1922 [58370]: https://github.com/rust-lang/rust/pull/58370/
1923 [58406]: https://github.com/rust-lang/rust/pull/58406/
1924 [58421]: https://github.com/rust-lang/rust/pull/58421/
1925 [58166]: https://github.com/rust-lang/rust/pull/58166/
1926 [58044]: https://github.com/rust-lang/rust/pull/58044/
1927 [58057]: https://github.com/rust-lang/rust/pull/58057/
1928 [58059]: https://github.com/rust-lang/rust/pull/58059/
1929 [57809]: https://github.com/rust-lang/rust/pull/57809/
1930 [57873]: https://github.com/rust-lang/rust/pull/57873/
1931 [57604]: https://github.com/rust-lang/rust/pull/57604/
1932 [57367]: https://github.com/rust-lang/rust/pull/57367/
1933 [57407]: https://github.com/rust-lang/rust/pull/57407/
1934 [57425]: https://github.com/rust-lang/rust/pull/57425/
1935 [57106]: https://github.com/rust-lang/rust/pull/57106/
1936 [56470]: https://github.com/rust-lang/rust/pull/56470/
1937 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1938 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1939 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1940 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1941 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1942 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1943 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1944 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1945 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1946 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1947 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1948 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1949 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1950 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1951 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1952 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1953 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1954 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1955 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1956 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1957 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1958 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1959 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1960 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1961 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1962 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1963 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1964 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1965 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1966 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1967 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1970 Version 1.33.0 (2019-02-28)
1971 ==========================
1975 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1976 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1977 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1978 E.g. You can have match statement on a `u8` that covers `0..=255` and
1979 you would no longer be required to have a `_ => unreachable!()` case.
1980 - [You can now have multiple patterns in `if let` and `while let`
1981 expressions.][57532] You can do this with the same syntax as a `match`
1991 let state = Creature::Crab("Ferris");
1993 if let Creature::Crab(name) | Creature::Person(name) = state {
1994 println!("This creature's name is: {}", name);
1998 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1999 this feature will by default produce a warning as this behaviour can be
2000 unintuitive. E.g. `if let _ = 5 {}`
2001 - [You can now use `let` bindings, assignments, expression statements,
2002 and irrefutable pattern destructuring in const functions.][57175]
2003 - [You can now call unsafe const functions.][57067] E.g.
2005 const unsafe fn foo() -> i32 { 5 }
2006 const fn bar() -> i32 {
2010 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2011 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2012 - [You can now specify a specific alignment with the `#[repr(packed)]`
2013 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2014 with an alignment of 2 bytes and a size of 6 bytes.
2015 - [You can now import an item from a module as an `_`.][56303] This allows you to
2016 import a trait's impls, and not have the name in the namespace. E.g.
2018 use std::io::Read as _;
2020 // Allowed as there is only one `Read` in the module.
2023 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2027 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2028 command line argument.][56351]
2029 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2030 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2031 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2032 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2033 information on Rust's platform support.
2034 - [Added support for the `thumbv7neon-linux-androideabi` and
2035 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2036 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2040 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2041 functions for all numeric types.][57566]
2042 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2043 are now `const` functions for all numeric types.][57105]
2044 - [The methods `is_positive` and `is_negative` are now `const` functions for
2045 all signed numeric types.][57105]
2046 - [The `get` method for all `NonZero` types is now `const`.][57167]
2047 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2048 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2049 numeric types.][57234]
2050 - [`Ipv4Addr::new` is now a `const` function][57234]
2054 - [`unix::FileExt::read_exact_at`]
2055 - [`unix::FileExt::write_all_at`]
2056 - [`Option::transpose`]
2057 - [`Result::transpose`]
2058 - [`convert::identity`]
2061 - [`marker::PhantomPinned`]
2062 - [`Vec::resize_with`]
2063 - [`VecDeque::resize_with`]
2064 - [`Duration::as_millis`]
2065 - [`Duration::as_micros`]
2066 - [`Duration::as_nanos`]
2071 - [You can now publish crates that require a feature flag to compile with
2072 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2073 - [Cargo should now rebuild a crate if a file was modified during the initial
2078 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2079 are now deprecated in the standard library, and their usage will now produce a warning.
2080 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2082 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2084 - [Libtest no longer creates a new thread for each test when
2085 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2087 [55982]: https://github.com/rust-lang/rust/pull/55982/
2088 [56243]: https://github.com/rust-lang/rust/pull/56243
2089 [56303]: https://github.com/rust-lang/rust/pull/56303/
2090 [56351]: https://github.com/rust-lang/rust/pull/56351/
2091 [56362]: https://github.com/rust-lang/rust/pull/56362
2092 [56642]: https://github.com/rust-lang/rust/pull/56642/
2093 [56769]: https://github.com/rust-lang/rust/pull/56769/
2094 [56805]: https://github.com/rust-lang/rust/pull/56805
2095 [56947]: https://github.com/rust-lang/rust/pull/56947/
2096 [57049]: https://github.com/rust-lang/rust/pull/57049/
2097 [57067]: https://github.com/rust-lang/rust/pull/57067/
2098 [57105]: https://github.com/rust-lang/rust/pull/57105
2099 [57130]: https://github.com/rust-lang/rust/pull/57130/
2100 [57167]: https://github.com/rust-lang/rust/pull/57167/
2101 [57175]: https://github.com/rust-lang/rust/pull/57175/
2102 [57234]: https://github.com/rust-lang/rust/pull/57234/
2103 [57332]: https://github.com/rust-lang/rust/pull/57332/
2104 [57465]: https://github.com/rust-lang/rust/pull/57465/
2105 [57532]: https://github.com/rust-lang/rust/pull/57532/
2106 [57535]: https://github.com/rust-lang/rust/pull/57535/
2107 [57566]: https://github.com/rust-lang/rust/pull/57566/
2108 [57615]: https://github.com/rust-lang/rust/pull/57615/
2109 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2110 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2111 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2112 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2113 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2114 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2115 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2116 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2117 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2118 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2119 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2120 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2121 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2122 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2123 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2124 [platform-support]: https://forge.rust-lang.org/platform-support.html
2126 Version 1.32.0 (2019-01-17)
2127 ==========================
2132 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2133 operator allows you to specify zero or one repetitions similar to the `*` and
2135 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2136 now always resolve to the item (`enum`, `struct`, etc.) available in the
2137 module if present, before resolving to a external crate or an item the prelude.][56759]
2140 enum Color { Red, Green, Blue }
2146 - [You can now match against `PhantomData<T>` types.][55837]
2147 - [You can now match against literals in macros with the `literal`
2148 specifier.][56072] This will match against a literal of any type.
2149 E.g. `1`, `'A'`, `"Hello World"`
2150 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2152 struct Point(i32, i32);
2155 pub fn new(x: i32, y: i32) -> Self {
2159 pub fn is_origin(&self) -> bool {
2167 - [Self can also now be used in type definitions.][56366] E.g.
2171 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2174 Cons(T, Box<Self>) // likewise here
2177 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2178 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2182 - [The default allocator has changed from jemalloc to the default allocator on
2183 your system.][55238] The compiler itself on Linux & macOS will still use
2184 jemalloc, but programs compiled with it will use the system allocator.
2185 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2189 - [`PathBuf` now implements `FromStr`.][55148]
2190 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2191 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2192 easily debug expressions in your rust program. E.g.
2195 let b = dbg!(a * 2) + 1;
2196 // ^-- prints: [src/main.rs:4] a * 2 = 4
2200 The following APIs are now `const` functions and can be used in a
2204 - [`UnsafeCell::get`]
2205 - [`char::is_ascii`]
2207 - [`ManuallyDrop::new`]
2208 - [`ManuallyDrop::into_inner`]
2209 - [`RangeInclusive::start`]
2210 - [`RangeInclusive::end`]
2211 - [`NonNull::as_ptr`]
2214 - [`Duration::as_secs`]
2215 - [`Duration::subsec_millis`]
2216 - [`Duration::subsec_micros`]
2217 - [`Duration::subsec_nanos`]
2219 - [`Ipv4Addr::is_unspecified`]
2221 - [`Ipv6Addr::octets`]
2225 - [`i8::to_be_bytes`]
2226 - [`i8::to_le_bytes`]
2227 - [`i8::to_ne_bytes`]
2228 - [`i8::from_be_bytes`]
2229 - [`i8::from_le_bytes`]
2230 - [`i8::from_ne_bytes`]
2231 - [`i16::to_be_bytes`]
2232 - [`i16::to_le_bytes`]
2233 - [`i16::to_ne_bytes`]
2234 - [`i16::from_be_bytes`]
2235 - [`i16::from_le_bytes`]
2236 - [`i16::from_ne_bytes`]
2237 - [`i32::to_be_bytes`]
2238 - [`i32::to_le_bytes`]
2239 - [`i32::to_ne_bytes`]
2240 - [`i32::from_be_bytes`]
2241 - [`i32::from_le_bytes`]
2242 - [`i32::from_ne_bytes`]
2243 - [`i64::to_be_bytes`]
2244 - [`i64::to_le_bytes`]
2245 - [`i64::to_ne_bytes`]
2246 - [`i64::from_be_bytes`]
2247 - [`i64::from_le_bytes`]
2248 - [`i64::from_ne_bytes`]
2249 - [`i128::to_be_bytes`]
2250 - [`i128::to_le_bytes`]
2251 - [`i128::to_ne_bytes`]
2252 - [`i128::from_be_bytes`]
2253 - [`i128::from_le_bytes`]
2254 - [`i128::from_ne_bytes`]
2255 - [`isize::to_be_bytes`]
2256 - [`isize::to_le_bytes`]
2257 - [`isize::to_ne_bytes`]
2258 - [`isize::from_be_bytes`]
2259 - [`isize::from_le_bytes`]
2260 - [`isize::from_ne_bytes`]
2261 - [`u8::to_be_bytes`]
2262 - [`u8::to_le_bytes`]
2263 - [`u8::to_ne_bytes`]
2264 - [`u8::from_be_bytes`]
2265 - [`u8::from_le_bytes`]
2266 - [`u8::from_ne_bytes`]
2267 - [`u16::to_be_bytes`]
2268 - [`u16::to_le_bytes`]
2269 - [`u16::to_ne_bytes`]
2270 - [`u16::from_be_bytes`]
2271 - [`u16::from_le_bytes`]
2272 - [`u16::from_ne_bytes`]
2273 - [`u32::to_be_bytes`]
2274 - [`u32::to_le_bytes`]
2275 - [`u32::to_ne_bytes`]
2276 - [`u32::from_be_bytes`]
2277 - [`u32::from_le_bytes`]
2278 - [`u32::from_ne_bytes`]
2279 - [`u64::to_be_bytes`]
2280 - [`u64::to_le_bytes`]
2281 - [`u64::to_ne_bytes`]
2282 - [`u64::from_be_bytes`]
2283 - [`u64::from_le_bytes`]
2284 - [`u64::from_ne_bytes`]
2285 - [`u128::to_be_bytes`]
2286 - [`u128::to_le_bytes`]
2287 - [`u128::to_ne_bytes`]
2288 - [`u128::from_be_bytes`]
2289 - [`u128::from_le_bytes`]
2290 - [`u128::from_ne_bytes`]
2291 - [`usize::to_be_bytes`]
2292 - [`usize::to_le_bytes`]
2293 - [`usize::to_ne_bytes`]
2294 - [`usize::from_be_bytes`]
2295 - [`usize::from_le_bytes`]
2296 - [`usize::from_ne_bytes`]
2300 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2301 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2305 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2309 - [The argument types for AVX's
2310 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2311 been changed from `*const` to `*mut` as the previous implementation
2315 [55148]: https://github.com/rust-lang/rust/pull/55148/
2316 [55238]: https://github.com/rust-lang/rust/pull/55238/
2317 [55280]: https://github.com/rust-lang/rust/pull/55280/
2318 [55610]: https://github.com/rust-lang/rust/pull/55610/
2319 [55663]: https://github.com/rust-lang/rust/pull/55663/
2320 [55702]: https://github.com/rust-lang/rust/pull/55702/
2321 [55837]: https://github.com/rust-lang/rust/pull/55837/
2322 [55843]: https://github.com/rust-lang/rust/pull/55843/
2323 [56072]: https://github.com/rust-lang/rust/pull/56072/
2324 [56245]: https://github.com/rust-lang/rust/pull/56245/
2325 [56365]: https://github.com/rust-lang/rust/pull/56365/
2326 [56366]: https://github.com/rust-lang/rust/pull/56366/
2327 [56395]: https://github.com/rust-lang/rust/pull/56395/
2328 [56759]: https://github.com/rust-lang/rust/pull/56759/
2329 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2330 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2331 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2332 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2333 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2334 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2335 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2336 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2337 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2338 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2339 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2340 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2341 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2342 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2343 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2344 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2345 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2346 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2347 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2348 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2349 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2350 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2351 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2352 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2353 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2354 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2355 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2356 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2357 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2358 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2359 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2360 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2361 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2362 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2363 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2364 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2365 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2366 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2367 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2368 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2369 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2370 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2371 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2372 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2373 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2374 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2375 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2376 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2377 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2378 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2379 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2380 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2381 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2382 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2383 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2384 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2385 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2386 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2387 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2388 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2389 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2390 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2391 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2392 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2393 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2394 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2395 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2396 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2397 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2398 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2399 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2400 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2401 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2402 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2403 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2404 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2405 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2406 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2407 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2408 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2409 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2410 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2411 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2412 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2413 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2414 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2415 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2416 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2417 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2418 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2419 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2420 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2421 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2424 Version 1.31.1 (2018-12-20)
2425 ===========================
2427 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2428 - [Fix broken go-to-definition in RLS][rls/1171]
2429 - [Fix infinite loop on hover in RLS][rls/1170]
2431 [56562]: https://github.com/rust-lang/rust/pull/56562
2432 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2433 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2435 Version 1.31.0 (2018-12-06)
2436 ==========================
2440 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2441 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2442 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2443 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2445 - [You can now define and use `const` functions.][54835] These are currently
2446 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2447 [language reference][const-reference] for what exactly is available.
2448 - [You can now use tool lints, which allow you to scope lints from external
2449 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2450 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2451 a crate, not just in exported functions.][54451]
2452 - [You can now use parentheses in pattern matches.][54497]
2456 - [Updated musl to 1.1.20][54430]
2460 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2461 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2462 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2463 into `Option<&mut T>` using the `From` trait.][53218]
2464 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2469 - [`slice::align_to`]
2470 - [`slice::align_to_mut`]
2471 - [`slice::chunks_exact`]
2472 - [`slice::chunks_exact_mut`]
2473 - [`slice::rchunks`]
2474 - [`slice::rchunks_mut`]
2475 - [`slice::rchunks_exact`]
2476 - [`slice::rchunks_exact_mut`]
2477 - [`Option::replace`]
2481 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2482 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2483 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2485 [52813]: https://github.com/rust-lang/rust/pull/52813/
2486 [53218]: https://github.com/rust-lang/rust/pull/53218/
2487 [53555]: https://github.com/rust-lang/rust/issues/53555/
2488 [54057]: https://github.com/rust-lang/rust/pull/54057/
2489 [54240]: https://github.com/rust-lang/rust/pull/54240/
2490 [54430]: https://github.com/rust-lang/rust/pull/54430/
2491 [54451]: https://github.com/rust-lang/rust/pull/54451/
2492 [54497]: https://github.com/rust-lang/rust/pull/54497/
2493 [54778]: https://github.com/rust-lang/rust/pull/54778/
2494 [54835]: https://github.com/rust-lang/rust/pull/54835/
2495 [54870]: https://github.com/rust-lang/rust/pull/54870/
2496 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2497 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2498 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2499 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2500 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2501 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2502 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2503 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2504 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2505 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2506 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2507 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2508 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2509 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2511 Version 1.30.1 (2018-11-08)
2512 ===========================
2514 - [Fixed overflow ICE in rustdoc][54199]
2515 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2517 [54199]: https://github.com/rust-lang/rust/pull/54199
2518 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2520 Version 1.30.0 (2018-10-25)
2521 ==========================
2525 - [Procedural macros are now available.][52081] These kinds of macros allow for
2526 more powerful code generation. There is a [new chapter available][proc-macros]
2527 in the Rust Programming Language book that goes further in depth.
2528 - [You can now use keywords as identifiers using the raw identifiers
2529 syntax (`r#`),][53236] e.g. `let r#for = true;`
2530 - [Using anonymous parameters in traits is now deprecated with a warning and
2531 will be a hard error in the 2018 edition.][53272]
2532 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2533 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2534 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2535 Previously, using a external crate in a module without a use statement
2536 required `let json = ::serde_json::from_str(foo);` but can now be written
2537 as `let json = serde_json::from_str(foo);`.
2538 - [You can now apply the `#[used]` attribute to static items to prevent the
2539 compiler from optimising them away, even if they appear to be unused,][51363]
2540 e.g. `#[used] static FOO: u32 = 1;`
2541 - [You can now import and reexport macros from other crates with the `use`
2542 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2543 the root module of the crate. If your macro relies on calling other local
2544 macros, it is recommended to export with the
2545 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2547 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2548 using the `vis` specifier.][53370]
2549 - [Non-macro attributes now allow all forms of literals, not just
2550 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2551 write `#[attr(true)]`.
2552 - [You can now specify a function to handle a panic in the Rust runtime with the
2553 `#[panic_handler]` attribute.][51366]
2557 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2558 - [Added the `aarch64-unknown-netbsd` target][53165]
2562 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2566 - [`Ipv4Addr::BROADCAST`]
2567 - [`Ipv4Addr::LOCALHOST`]
2568 - [`Ipv4Addr::UNSPECIFIED`]
2569 - [`Ipv6Addr::LOCALHOST`]
2570 - [`Ipv6Addr::UNSPECIFIED`]
2571 - [`Iterator::find_map`]
2573 The following methods are replacement methods for `trim_left`, `trim_right`,
2574 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2576 - [`str::trim_end_matches`]
2578 - [`str::trim_start_matches`]
2579 - [`str::trim_start`]
2583 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2584 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2585 equivalent to calling `rustdoc --error-format=json`.
2586 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2590 - [`rustdoc` allows you to specify what edition to treat your code as with the
2591 `--edition` option.][54057]
2592 - [`rustdoc` now has the `--color` (specify whether to output color) and
2593 `--error-format` (specify error format, e.g. `json`) options.][53003]
2594 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2595 debug symbols.][53774]
2596 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2597 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2599 [50911]: https://github.com/rust-lang/rust/pull/50911/
2600 [51363]: https://github.com/rust-lang/rust/pull/51363/
2601 [51366]: https://github.com/rust-lang/rust/pull/51366/
2602 [52081]: https://github.com/rust-lang/rust/pull/52081/
2603 [53003]: https://github.com/rust-lang/rust/pull/53003/
2604 [53033]: https://github.com/rust-lang/rust/pull/53033/
2605 [53044]: https://github.com/rust-lang/rust/pull/53044/
2606 [53165]: https://github.com/rust-lang/rust/pull/53165/
2607 [53213]: https://github.com/rust-lang/rust/pull/53213/
2608 [53236]: https://github.com/rust-lang/rust/pull/53236/
2609 [53272]: https://github.com/rust-lang/rust/pull/53272/
2610 [53370]: https://github.com/rust-lang/rust/pull/53370/
2611 [53459]: https://github.com/rust-lang/rust/pull/53459/
2612 [53774]: https://github.com/rust-lang/rust/pull/53774/
2613 [53822]: https://github.com/rust-lang/rust/pull/53822/
2614 [54057]: https://github.com/rust-lang/rust/pull/54057/
2615 [54146]: https://github.com/rust-lang/rust/pull/54146/
2616 [54404]: https://github.com/rust-lang/rust/pull/54404/
2617 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2618 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2619 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2620 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2622 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2623 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2624 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2625 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2626 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2627 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2628 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2629 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2630 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2631 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2634 Version 1.29.2 (2018-10-11)
2635 ===========================
2637 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2638 - The `rls-preview` component on the windows-gnu targets has been restored.
2640 [54639]: https://github.com/rust-lang/rust/pull/54639
2643 Version 1.29.1 (2018-09-25)
2644 ===========================
2649 - The standard library's `str::repeat` function contained an out of bounds write
2650 caused by an integer overflow. This has been fixed by deterministically
2651 panicking when an overflow happens.
2653 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2657 Version 1.29.0 (2018-09-13)
2658 ==========================
2662 - [Bumped minimum LLVM version to 5.0.][51899]
2663 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2664 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2668 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2669 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2670 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2671 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2673 - [`Cell<T>` now allows `T` to be unsized.][50494]
2674 - [`SocketAddr` is now stable on Redox.][52656]
2679 - [`Iterator::flatten`]
2684 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2685 `--locked` to disable this behavior.
2686 - [`cargo-install` will now allow you to cross compile an install
2687 using `--target`.][cargo/5614]
2688 - [Added the `cargo-fix` subcommand to automatically move project code from
2689 2015 edition to 2018.][cargo/5723]
2690 - [`cargo doc` can now optionally document private types using the
2691 `--document-private-items` flag.][cargo/5543]
2695 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2696 the specified level to that level.][52354] For example `--cap-lints warn`
2697 will demote `deny` and `forbid` lints to `warn`.
2698 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2699 fails and `101` if there is a panic.][52197]
2700 - [A preview of clippy has been made available through rustup.][51122]
2701 You can install the preview with `rustup component add clippy-preview`.
2705 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2706 Use `str::get_unchecked(begin..end)` instead.
2707 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2708 Consider using the `home_dir` function from
2709 https://crates.io/crates/dirs instead.
2710 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2711 - [`cfg` attributes and `--cfg` command line flags are now more
2712 strictly validated.][53893]
2714 [53893]: https://github.com/rust-lang/rust/pull/53893/
2715 [52861]: https://github.com/rust-lang/rust/pull/52861/
2716 [52656]: https://github.com/rust-lang/rust/pull/52656/
2717 [52239]: https://github.com/rust-lang/rust/pull/52239/
2718 [52330]: https://github.com/rust-lang/rust/pull/52330/
2719 [52354]: https://github.com/rust-lang/rust/pull/52354/
2720 [52402]: https://github.com/rust-lang/rust/pull/52402/
2721 [52103]: https://github.com/rust-lang/rust/pull/52103/
2722 [52197]: https://github.com/rust-lang/rust/pull/52197/
2723 [51807]: https://github.com/rust-lang/rust/pull/51807/
2724 [51899]: https://github.com/rust-lang/rust/pull/51899/
2725 [51912]: https://github.com/rust-lang/rust/pull/51912/
2726 [51511]: https://github.com/rust-lang/rust/pull/51511/
2727 [51619]: https://github.com/rust-lang/rust/pull/51619/
2728 [51656]: https://github.com/rust-lang/rust/pull/51656/
2729 [51178]: https://github.com/rust-lang/rust/pull/51178/
2730 [51122]: https://github.com/rust-lang/rust/pull/51122
2731 [50494]: https://github.com/rust-lang/rust/pull/50494/
2732 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2733 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2734 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2735 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2736 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2737 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2738 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2741 Version 1.28.0 (2018-08-02)
2742 ===========================
2746 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2747 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2748 the inner type across Foreign Function Interface (FFI) boundaries.
2749 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2750 and can now be used as identifiers.][51196]
2751 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2752 stable.][51241] This will allow users to specify a global allocator for
2754 - [Unit test functions marked with the `#[test]` attribute can now return
2755 `Result<(), E: Debug>` in addition to `()`.][51298]
2756 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2757 allows macros to easily target lifetimes.
2761 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2762 prioritise making smaller binary sizes. `z` is the same as `s` with the
2763 exception that it does not vectorise loops, which typically results in an even
2765 - [The short error format is now stable.][49546] Specified with
2766 `--error-format=short` this option will provide a more compressed output of
2767 rust error messages.
2768 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2769 - [Reduced the number of allocations in the macro parser.][50855] This can
2770 improve compile times of macro heavy crates on average by 5%.
2774 - [Implemented `Default` for `&mut str`.][51306]
2775 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2776 - [Implemented `Extend` for `()`.][50234]
2777 - [The `Debug` implementation of `time::Duration` should now be more easily
2778 human readable.][50364] Previously a `Duration` of one second would printed as
2779 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2780 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2781 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2782 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2783 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2784 for `PathBuf`.][50170]
2785 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2786 and `Wrapping<i128>`.][50465]
2787 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2788 possible.][51050] This can provide up to a 40% speed increase.
2789 - [Improved error messages when using `format!`.][50610]
2793 - [`Iterator::step_by`]
2794 - [`Path::ancestors`]
2795 - [`SystemTime::UNIX_EPOCH`]
2796 - [`alloc::GlobalAlloc`]
2798 - [`alloc::LayoutErr`]
2801 - [`alloc::alloc_zeroed`]
2802 - [`alloc::dealloc`]
2803 - [`alloc::realloc`]
2804 - [`alloc::handle_alloc_error`]
2805 - [`btree_map::Entry::or_default`]
2806 - [`fmt::Alignment`]
2807 - [`hash_map::Entry::or_default`]
2808 - [`iter::repeat_with`]
2809 - [`num::NonZeroUsize`]
2810 - [`num::NonZeroU128`]
2811 - [`num::NonZeroU16`]
2812 - [`num::NonZeroU32`]
2813 - [`num::NonZeroU64`]
2814 - [`num::NonZeroU8`]
2815 - [`ops::RangeBounds`]
2816 - [`slice::SliceIndex`]
2817 - [`slice::from_mut`]
2818 - [`slice::from_ref`]
2819 - [`{Any + Send + Sync}::downcast_mut`]
2820 - [`{Any + Send + Sync}::downcast_ref`]
2821 - [`{Any + Send + Sync}::is`]
2825 - [Cargo will now no longer allow you to publish crates with build scripts that
2826 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2827 considered to be immutable.
2831 - [The `suggestion_applicability` field in `rustc`'s json output is now
2832 stable.][50486] This will allow dev tools to check whether a code suggestion
2833 would apply to them.
2837 - [Rust will consider trait objects with duplicated constraints to be the same
2838 type as without the duplicated constraint.][51276] For example the below code will
2839 now fail to compile.
2844 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2847 impl Trait + Send + Send {
2848 fn test(&self) { println!("two"); }
2852 [49546]: https://github.com/rust-lang/rust/pull/49546/
2853 [50143]: https://github.com/rust-lang/rust/pull/50143/
2854 [50170]: https://github.com/rust-lang/rust/pull/50170/
2855 [50234]: https://github.com/rust-lang/rust/pull/50234/
2856 [50265]: https://github.com/rust-lang/rust/pull/50265/
2857 [50364]: https://github.com/rust-lang/rust/pull/50364/
2858 [50385]: https://github.com/rust-lang/rust/pull/50385/
2859 [50465]: https://github.com/rust-lang/rust/pull/50465/
2860 [50486]: https://github.com/rust-lang/rust/pull/50486/
2861 [50554]: https://github.com/rust-lang/rust/pull/50554/
2862 [50610]: https://github.com/rust-lang/rust/pull/50610/
2863 [50855]: https://github.com/rust-lang/rust/pull/50855/
2864 [51050]: https://github.com/rust-lang/rust/pull/51050/
2865 [51196]: https://github.com/rust-lang/rust/pull/51196/
2866 [51200]: https://github.com/rust-lang/rust/pull/51200/
2867 [51241]: https://github.com/rust-lang/rust/pull/51241/
2868 [51276]: https://github.com/rust-lang/rust/pull/51276/
2869 [51298]: https://github.com/rust-lang/rust/pull/51298/
2870 [51306]: https://github.com/rust-lang/rust/pull/51306/
2871 [51562]: https://github.com/rust-lang/rust/pull/51562/
2872 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2873 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2874 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2875 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2876 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2877 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2878 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2879 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2880 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2881 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2882 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2883 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2884 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2885 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2886 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2887 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2888 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2889 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2890 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2891 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2892 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2893 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2894 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2895 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2896 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2897 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2898 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2899 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2900 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2901 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2903 Version 1.27.2 (2018-07-20)
2904 ===========================
2909 - The borrow checker was fixed to avoid potential unsoundness when using
2910 match ergonomics: [#52213][52213].
2912 [52213]: https://github.com/rust-lang/rust/issues/52213
2914 Version 1.27.1 (2018-07-10)
2915 ===========================
2920 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2921 when running, which enabled executing code as some other user on a
2922 given machine. This release fixes that vulnerability; you can read
2923 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2925 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2930 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2931 match ergonomics: [#51415][51415], [#49534][49534].
2933 [51415]: https://github.com/rust-lang/rust/issues/51415
2934 [49534]: https://github.com/rust-lang/rust/issues/49534
2935 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2936 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2938 Version 1.27.0 (2018-06-21)
2939 ==========================
2943 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2944 be used as an identifier.
2945 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2946 bare `Trait` syntax, and should make it clearer when being used in tandem with
2947 `impl Trait` because it is equivalent to the following syntax:
2948 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2949 `Box<Trait> == Box<dyn Trait>`.
2950 - [Attributes on generic parameters such as types and lifetimes are
2951 now stable.][48851] e.g.
2952 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2953 - [The `#[must_use]` attribute can now also be used on functions as well as
2954 types.][48925] It provides a lint that by default warns users when the
2955 value returned by a function has not been used.
2959 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2963 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2964 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2965 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2966 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2967 the `cfg` attribute.
2968 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2969 std are now available in core.][49896]
2970 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2972 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2973 that the operation isn't done in place.
2974 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2975 the `#[must_use]` attribute][49533] to warn about unused potentially
2976 expensive allocations.
2980 - [`DoubleEndedIterator::rfind`]
2981 - [`DoubleEndedIterator::rfold`]
2982 - [`DoubleEndedIterator::try_rfold`]
2983 - [`Duration::from_micros`]
2984 - [`Duration::from_nanos`]
2985 - [`Duration::subsec_micros`]
2986 - [`Duration::subsec_millis`]
2987 - [`HashMap::remove_entry`]
2988 - [`Iterator::try_fold`]
2989 - [`Iterator::try_for_each`]
2991 - [`Option::filter`]
2992 - [`String::replace_range`]
2993 - [`Take::set_limit`]
2994 - [`hint::unreachable_unchecked`]
2995 - [`os::unix::process::parent_id`]
2996 - [`ptr::swap_nonoverlapping`]
2997 - [`slice::rsplit_mut`]
2999 - [`slice::swap_with_slice`]
3003 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3004 `readme`, and `repository` fields.][cargo/5386]
3005 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3006 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3007 a different directory than `target` for placing compilation artifacts.
3008 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3009 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3010 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3011 where cargo would infer a binary, Cargo will produce a warning. You can
3012 disable this feature ahead of time by setting any of the following to false:
3013 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3014 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3015 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3019 - [Added “The Rustc book” into the official documentation.][49707]
3020 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3021 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3025 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3026 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3027 compile, `"".is_empty()` will still compile.
3028 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3029 will only print the inner type.][48553] E.g.
3030 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3031 not `AtomicBool(true)`.
3032 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3033 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3034 alignment should cover all use cases.
3035 - The `.description()` method on the `std::error::Error` trait
3036 [has been soft-deprecated][50163]. It is no longer required to implement it.
3038 [48553]: https://github.com/rust-lang/rust/pull/48553/
3039 [48851]: https://github.com/rust-lang/rust/pull/48851/
3040 [48925]: https://github.com/rust-lang/rust/pull/48925/
3041 [49533]: https://github.com/rust-lang/rust/pull/49533/
3042 [49623]: https://github.com/rust-lang/rust/pull/49623/
3043 [49630]: https://github.com/rust-lang/rust/pull/49630/
3044 [49664]: https://github.com/rust-lang/rust/pull/49664/
3045 [49699]: https://github.com/rust-lang/rust/pull/49699/
3046 [49707]: https://github.com/rust-lang/rust/pull/49707/
3047 [49719]: https://github.com/rust-lang/rust/pull/49719/
3048 [49896]: https://github.com/rust-lang/rust/pull/49896/
3049 [49968]: https://github.com/rust-lang/rust/pull/49968/
3050 [50163]: https://github.com/rust-lang/rust/pull/50163
3051 [50177]: https://github.com/rust-lang/rust/pull/50177/
3052 [50378]: https://github.com/rust-lang/rust/pull/50378/
3053 [50398]: https://github.com/rust-lang/rust/pull/50398/
3054 [50423]: https://github.com/rust-lang/rust/pull/50423/
3055 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3056 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3057 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3058 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3059 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3060 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3061 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3062 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3063 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3064 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3065 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3066 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3067 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3068 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3069 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3070 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3071 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3072 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3073 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3074 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3075 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3076 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3077 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3078 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3079 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3080 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3081 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3082 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3083 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3084 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3087 Version 1.26.2 (2018-06-05)
3088 ==========================
3093 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3095 [51117]: https://github.com/rust-lang/rust/issues/51117
3098 Version 1.26.1 (2018-05-29)
3099 ==========================
3104 - [RLS now works on Windows.][50646]
3105 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3111 - [`fn main() -> impl Trait` no longer works for non-Termination
3113 This reverts an accidental stabilization.
3114 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3115 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3117 [50646]: https://github.com/rust-lang/rust/issues/50646
3118 [50656]: https://github.com/rust-lang/rust/pull/50656
3119 [50812]: https://github.com/rust-lang/rust/pull/50812
3120 [50950]: https://github.com/rust-lang/rust/issues/50950
3121 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3123 Version 1.26.0 (2018-05-10)
3124 ==========================
3128 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3129 implement either or both traits.][49299]
3130 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3131 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3132 lifetime can be elided.][49458]
3133 - [`impl Trait` is now stable allowing you to have abstract types in returns
3134 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3135 `fn open(path: impl AsRef<Path>)`.
3136 - [Pattern matching will now automatically apply dereferences.][49394]
3137 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3138 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3139 - [A lot of operations are now available in a const context.][46882] E.g. You
3140 can now index into constant arrays, reference and dereference into constants,
3141 and use tuple struct constructors.
3142 - [Fixed entry slice patterns are now stable.][48516] E.g.
3144 let points = [1, 2, 3, 4];
3146 [1, 2, 3, 4] => println!("All points were sequential."),
3147 _ => println!("Not all points were sequential."),
3154 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3155 - [Fixed exponential projection complexity on nested types.][48296]
3156 This can provide up to a ~12% reduction in compile times for certain crates.
3157 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3158 to remap path prefixes outputted by the compiler.
3159 - [Added `powerpc-unknown-netbsd` target.][48281]
3163 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3164 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3165 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3166 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3167 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3168 - [`ascii::escape_default` is now available in libcore.][48735]
3169 - [Trailing commas are now supported in std and core macros.][48056]
3170 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3171 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3176 - [`*const T::copy_to_nonoverlapping`]
3177 - [`*const T::copy_to`]
3178 - [`*const T::read_unaligned`]
3179 - [`*const T::read_volatile`]
3180 - [`*const T::read`]
3182 - [`*const T::wrapping_add`]
3183 - [`*const T::wrapping_sub`]
3185 - [`*mut T::copy_to_nonoverlapping`]
3186 - [`*mut T::copy_to`]
3187 - [`*mut T::read_unaligned`]
3188 - [`*mut T::read_volatile`]
3190 - [`*mut T::replace`]
3193 - [`*mut T::wrapping_add`]
3194 - [`*mut T::wrapping_sub`]
3195 - [`*mut T::write_bytes`]
3196 - [`*mut T::write_unaligned`]
3197 - [`*mut T::write_volatile`]
3200 - [`FromUtf8Error::as_bytes`]
3201 - [`LocalKey::try_with`]
3202 - [`Option::cloned`]
3203 - [`btree_map::Entry::and_modify`]
3204 - [`fs::read_to_string`]
3207 - [`hash_map::Entry::and_modify`]
3208 - [`iter::FusedIterator`]
3209 - [`ops::RangeInclusive`]
3210 - [`ops::RangeToInclusive`]
3212 - [`slice::rotate_left`]
3213 - [`slice::rotate_right`]
3214 - [`String::retain`]
3219 - [Cargo will now output path to custom commands when `-v` is
3220 passed with `--list`][cargo/5041]
3221 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3225 - [The second edition of "The Rust Programming Language" book is now recommended
3226 over the first.][48404]
3231 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3232 syntax is now invalid.
3234 use std::ops::Fn as dyn;
3235 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3237 - [The result of dereferences are no longer promoted to `'static`.][47408]
3241 const PAIR: &(i32, i32) = &(0, 1);
3242 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3245 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3246 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3248 - [Removed hoedown from rustdoc.][48274]
3249 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3251 [46882]: https://github.com/rust-lang/rust/pull/46882
3252 [47379]: https://github.com/rust-lang/rust/pull/47379
3253 [47408]: https://github.com/rust-lang/rust/pull/47408
3254 [47813]: https://github.com/rust-lang/rust/pull/47813
3255 [48056]: https://github.com/rust-lang/rust/pull/48056
3256 [48125]: https://github.com/rust-lang/rust/pull/48125
3257 [48166]: https://github.com/rust-lang/rust/pull/48166
3258 [48235]: https://github.com/rust-lang/rust/pull/48235
3259 [48274]: https://github.com/rust-lang/rust/pull/48274
3260 [48281]: https://github.com/rust-lang/rust/pull/48281
3261 [48296]: https://github.com/rust-lang/rust/pull/48296
3262 [48326]: https://github.com/rust-lang/rust/pull/48326
3263 [48359]: https://github.com/rust-lang/rust/pull/48359
3264 [48404]: https://github.com/rust-lang/rust/pull/48404
3265 [48481]: https://github.com/rust-lang/rust/pull/48481
3266 [48516]: https://github.com/rust-lang/rust/pull/48516
3267 [48628]: https://github.com/rust-lang/rust/pull/48628
3268 [48629]: https://github.com/rust-lang/rust/pull/48629
3269 [48657]: https://github.com/rust-lang/rust/pull/48657
3270 [48735]: https://github.com/rust-lang/rust/pull/48735
3271 [48978]: https://github.com/rust-lang/rust/pull/48978
3272 [49101]: https://github.com/rust-lang/rust/pull/49101
3273 [49109]: https://github.com/rust-lang/rust/pull/49109
3274 [49121]: https://github.com/rust-lang/rust/pull/49121
3275 [49162]: https://github.com/rust-lang/rust/pull/49162
3276 [49184]: https://github.com/rust-lang/rust/pull/49184
3277 [49234]: https://github.com/rust-lang/rust/pull/49234
3278 [49255]: https://github.com/rust-lang/rust/pull/49255
3279 [49299]: https://github.com/rust-lang/rust/pull/49299
3280 [49305]: https://github.com/rust-lang/rust/pull/49305
3281 [49394]: https://github.com/rust-lang/rust/pull/49394
3282 [49458]: https://github.com/rust-lang/rust/pull/49458
3283 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3284 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3285 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3286 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3287 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3288 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3289 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3290 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3291 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3292 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3293 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3294 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3295 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3296 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3297 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3298 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3299 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3300 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3301 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3302 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3303 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3304 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3305 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3306 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3307 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3308 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3309 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3310 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3311 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3312 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3313 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3314 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3315 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3316 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3317 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3318 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3319 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3320 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3321 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3322 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3323 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3324 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3327 Version 1.25.0 (2018-03-29)
3328 ==========================
3332 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3333 - [You can now use nested groups of imports.][47948]
3334 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3335 - [You can now have `|` at the start of a match arm.][47947] e.g.
3337 enum Foo { A, B, C }
3343 | Foo::B => println!("AB"),
3344 | Foo::C => println!("C"),
3351 - [Upgraded to LLVM 6.][47828]
3352 - [Added `-C lto=val` option.][47521]
3353 - [Added `i586-unknown-linux-musl` target][47282]
3357 - [Impl Send for `process::Command` on Unix.][47760]
3358 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3359 - [`UnsafeCell::into_inner` is now safe.][47204]
3360 - [Implement libstd for CloudABI.][47268]
3361 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3362 - [Implement `AsRef<Path>` for Component][46985]
3363 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3364 - [Moved `Duration` to libcore.][46666]
3368 - [`Location::column`]
3371 The following functions can now be used in a constant expression.
3372 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3373 - [`Duration::new`][47300]
3374 - [`Duration::from_secs`][47300]
3375 - [`Duration::from_millis`][47300]
3379 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3380 - [`cargo new` now defaults to creating a binary crate, instead of a
3381 library crate.][cargo/5029]
3385 - [Rust by example is now shipped with new releases][46196]
3389 - [Deprecated `net::lookup_host`.][47510]
3390 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3391 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3392 around indexing operations (see [#47349][47349]). This has been fixed (which also
3393 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3394 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3396 [33903]: https://github.com/rust-lang/rust/pull/33903
3397 [47947]: https://github.com/rust-lang/rust/pull/47947
3398 [47948]: https://github.com/rust-lang/rust/pull/47948
3399 [47760]: https://github.com/rust-lang/rust/pull/47760
3400 [47790]: https://github.com/rust-lang/rust/pull/47790
3401 [47828]: https://github.com/rust-lang/rust/pull/47828
3402 [47398]: https://github.com/rust-lang/rust/pull/47398
3403 [47510]: https://github.com/rust-lang/rust/pull/47510
3404 [47521]: https://github.com/rust-lang/rust/pull/47521
3405 [47204]: https://github.com/rust-lang/rust/pull/47204
3406 [47251]: https://github.com/rust-lang/rust/pull/47251
3407 [47268]: https://github.com/rust-lang/rust/pull/47268
3408 [47282]: https://github.com/rust-lang/rust/pull/47282
3409 [47300]: https://github.com/rust-lang/rust/pull/47300
3410 [47349]: https://github.com/rust-lang/rust/pull/47349
3411 [46931]: https://github.com/rust-lang/rust/pull/46931
3412 [46985]: https://github.com/rust-lang/rust/pull/46985
3413 [47006]: https://github.com/rust-lang/rust/pull/47006
3414 [46830]: https://github.com/rust-lang/rust/pull/46830
3415 [46095]: https://github.com/rust-lang/rust/pull/46095
3416 [46666]: https://github.com/rust-lang/rust/pull/46666
3417 [46196]: https://github.com/rust-lang/rust/pull/46196
3418 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3419 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3420 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3421 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3422 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3425 Version 1.24.1 (2018-03-01)
3426 ==========================
3428 - [Do not abort when unwinding through FFI][48251]
3429 - [Emit UTF-16 files for linker arguments on Windows][48318]
3430 - [Make the error index generator work again][48308]
3431 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3433 [48251]: https://github.com/rust-lang/rust/issues/48251
3434 [48308]: https://github.com/rust-lang/rust/issues/48308
3435 [48318]: https://github.com/rust-lang/rust/issues/48318
3436 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3439 Version 1.24.0 (2018-02-15)
3440 ==========================
3444 - [External `sysv64` ffi is now available.][46528]
3445 eg. `extern "sysv64" fn foo () {}`
3449 - [rustc now uses 16 codegen units by default for release builds.][46910]
3450 For the fastest builds, utilize `codegen-units=1`.
3451 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3452 - [Add `aarch64-unknown-openbsd` support][46760]
3456 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3457 improvement in performance in the majority of cases.
3458 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3459 with Windows.][46798]
3460 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3461 - [impl `From<bool>` for `AtomicBool`][46293]
3462 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3463 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3464 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3465 - [float::from_bits now just uses transmute.][46012] This provides
3466 some optimisations from LLVM.
3467 - [Copied `AsciiExt` methods onto `char`][46077]
3468 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3469 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3470 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3471 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3475 - [`RefCell::replace`]
3477 - [`atomic::spin_loop_hint`]
3479 The following functions can now be used in a constant expression.
3480 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3482 - [`AtomicBool::new`][46287]
3483 - [`AtomicUsize::new`][46287]
3484 - [`AtomicIsize::new`][46287]
3485 - [`AtomicPtr::new`][46287]
3486 - [`Cell::new`][46287]
3487 - [`{integer}::min_value`][46287]
3488 - [`{integer}::max_value`][46287]
3489 - [`mem::size_of`][46287]
3490 - [`mem::align_of`][46287]
3491 - [`ptr::null`][46287]
3492 - [`ptr::null_mut`][46287]
3493 - [`RefCell::new`][46287]
3494 - [`UnsafeCell::new`][46287]
3498 - [Added a `workspace.default-members` config that
3499 overrides implied `--all` in virtual workspaces.][cargo/4743]
3500 - [Enable incremental by default on development builds.][cargo/4817] Also added
3501 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3502 per-project or global basis respectively.
3509 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3510 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3511 in accordance with IETF RFC 4291 §2.2.
3512 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3513 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3514 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3515 - [Leading zeros in tuple struct members is now an error][47084]
3516 - [`column!()` macro is one-based instead of zero-based][46977]
3517 - [`fmt::Arguments` can no longer be shared across threads][45198]
3518 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3519 - [Cargo sets a different working directory for the compiler][cargo/4788]
3521 [44884]: https://github.com/rust-lang/rust/pull/44884
3522 [45198]: https://github.com/rust-lang/rust/pull/45198
3523 [45506]: https://github.com/rust-lang/rust/pull/45506
3524 [45904]: https://github.com/rust-lang/rust/pull/45904
3525 [45990]: https://github.com/rust-lang/rust/pull/45990
3526 [46012]: https://github.com/rust-lang/rust/pull/46012
3527 [46077]: https://github.com/rust-lang/rust/pull/46077
3528 [46094]: https://github.com/rust-lang/rust/pull/46094
3529 [46284]: https://github.com/rust-lang/rust/pull/46284
3530 [46287]: https://github.com/rust-lang/rust/pull/46287
3531 [46293]: https://github.com/rust-lang/rust/pull/46293
3532 [46528]: https://github.com/rust-lang/rust/pull/46528
3533 [46671]: https://github.com/rust-lang/rust/pull/46671
3534 [46713]: https://github.com/rust-lang/rust/pull/46713
3535 [46735]: https://github.com/rust-lang/rust/pull/46735
3536 [46749]: https://github.com/rust-lang/rust/pull/46749
3537 [46760]: https://github.com/rust-lang/rust/pull/46760
3538 [46798]: https://github.com/rust-lang/rust/pull/46798
3539 [46828]: https://github.com/rust-lang/rust/pull/46828
3540 [46831]: https://github.com/rust-lang/rust/pull/46831
3541 [46833]: https://github.com/rust-lang/rust/pull/46833
3542 [46910]: https://github.com/rust-lang/rust/pull/46910
3543 [46977]: https://github.com/rust-lang/rust/pull/46977
3544 [47018]: https://github.com/rust-lang/rust/pull/47018
3545 [47080]: https://github.com/rust-lang/rust/pull/47080
3546 [47084]: https://github.com/rust-lang/rust/pull/47084
3547 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3548 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3549 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3550 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3551 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3552 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3555 Version 1.23.0 (2018-01-04)
3556 ==========================
3560 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3561 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3562 Which should fix some confusing errors in some operations.
3566 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3567 undefined behavior.][45920]
3568 - [rustc now suggests renaming import if names clash.][45660]
3569 - [Display errors/warnings correctly when there are zero-width or
3570 wide characters.][45711]
3571 - [rustc now avoids unnecessary copies of arguments that are
3572 simple bindings][45380] This should improve memory usage on average by 5-10%.
3573 - [Updated musl used to build musl rustc to 1.1.17][45393]
3577 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3578 - [Implement Hash for raw pointers to unsized types][45483]
3579 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3580 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3581 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3582 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3583 and `<*mut T>::as_mut`][44932]
3584 - [Optimized `Thread::{park, unpark}` implementation][45524]
3585 - [Improved `SliceExt::binary_search` performance.][45333]
3586 - [impl `FromIterator<()>` for `()`][45379]
3587 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3595 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3596 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3597 - [Added unit test checking to `cargo check`][cargo/4592]
3598 - [Cargo now lets you install a specific version
3599 using `cargo install --version`][cargo/4637]
3603 - [Releases now ship with the Cargo book documentation.][45692]
3604 - [rustdoc now prints rendering warnings on every run.][45324]
3608 - [Changes have been made to type equality to make it more correct,
3609 in rare cases this could break some code.][45853] [Tracking issue for
3610 further information][45852]
3611 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3612 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3613 Android 9, the minimum supported version is Android 14.
3614 - [Bumped the minimum LLVM to 3.9][45326]
3616 [44042]: https://github.com/rust-lang/rust/pull/44042
3617 [44932]: https://github.com/rust-lang/rust/pull/44932
3618 [45267]: https://github.com/rust-lang/rust/pull/45267
3619 [45324]: https://github.com/rust-lang/rust/pull/45324
3620 [45326]: https://github.com/rust-lang/rust/pull/45326
3621 [45333]: https://github.com/rust-lang/rust/pull/45333
3622 [45379]: https://github.com/rust-lang/rust/pull/45379
3623 [45380]: https://github.com/rust-lang/rust/pull/45380
3624 [45393]: https://github.com/rust-lang/rust/pull/45393
3625 [45435]: https://github.com/rust-lang/rust/pull/45435
3626 [45483]: https://github.com/rust-lang/rust/pull/45483
3627 [45524]: https://github.com/rust-lang/rust/pull/45524
3628 [45571]: https://github.com/rust-lang/rust/pull/45571
3629 [45580]: https://github.com/rust-lang/rust/pull/45580
3630 [45610]: https://github.com/rust-lang/rust/pull/45610
3631 [45660]: https://github.com/rust-lang/rust/pull/45660
3632 [45692]: https://github.com/rust-lang/rust/pull/45692
3633 [45711]: https://github.com/rust-lang/rust/pull/45711
3634 [45772]: https://github.com/rust-lang/rust/pull/45772
3635 [45852]: https://github.com/rust-lang/rust/issues/45852
3636 [45853]: https://github.com/rust-lang/rust/pull/45853
3637 [45887]: https://github.com/rust-lang/rust/pull/45887
3638 [45920]: https://github.com/rust-lang/rust/pull/45920
3639 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3640 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3641 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3644 Version 1.22.1 (2017-11-22)
3645 ==========================
3647 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3649 [46183]: https://github.com/rust-lang/rust/pull/46183
3651 Version 1.22.0 (2017-11-22)
3652 ==========================
3656 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3657 - [Now accepts underscores in unicode escapes][43716]
3658 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3659 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3663 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3664 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3665 This should decrease compile times for debug builds.
3666 - [strict memory alignment now enabled on ARMv6][45094]
3667 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3671 - [Allow atomic operations up to 32 bits
3672 on `armv5te_unknown_linux_gnueabi`][44978]
3673 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3674 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3675 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3676 - [Properly detect overflow in `Instant += Duration`.][44220]
3677 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3678 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3679 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3686 - [Cargo will now build multi file examples in subdirectories of the `examples`
3687 folder that have a `main.rs` file.][cargo/4496]
3688 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3689 the old format will continue to work and can be updated with `cargo update`.
3690 - [Now supports vendoring git repositories][cargo/3992]
3694 - [`libbacktrace` is now available on Apple platforms.][44251]
3695 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3696 This now lets you specify that a given code example will fail to compile.
3700 - [The minimum Android version that rustc can build for has been bumped
3701 to `4.0` from `2.3`][45656]
3702 - [Allowing `T op= &T` for numeric types has broken some type
3703 inference cases][45480]
3706 [42526]: https://github.com/rust-lang/rust/pull/42526
3707 [43017]: https://github.com/rust-lang/rust/pull/43017
3708 [43716]: https://github.com/rust-lang/rust/pull/43716
3709 [43949]: https://github.com/rust-lang/rust/pull/43949
3710 [44015]: https://github.com/rust-lang/rust/pull/44015
3711 [44220]: https://github.com/rust-lang/rust/pull/44220
3712 [44251]: https://github.com/rust-lang/rust/pull/44251
3713 [44287]: https://github.com/rust-lang/rust/pull/44287
3714 [44303]: https://github.com/rust-lang/rust/pull/44303
3715 [44456]: https://github.com/rust-lang/rust/pull/44456
3716 [44466]: https://github.com/rust-lang/rust/pull/44466
3717 [44895]: https://github.com/rust-lang/rust/pull/44895
3718 [44966]: https://github.com/rust-lang/rust/pull/44966
3719 [44978]: https://github.com/rust-lang/rust/pull/44978
3720 [45041]: https://github.com/rust-lang/rust/pull/45041
3721 [45064]: https://github.com/rust-lang/rust/pull/45064
3722 [45075]: https://github.com/rust-lang/rust/pull/45075
3723 [45094]: https://github.com/rust-lang/rust/pull/45094
3724 [45095]: https://github.com/rust-lang/rust/pull/45095
3725 [45480]: https://github.com/rust-lang/rust/issues/45480
3726 [45656]: https://github.com/rust-lang/rust/pull/45656
3727 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3728 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3729 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3736 Version 1.21.0 (2017-10-12)
3737 ==========================
3741 - [You can now use static references for literals.][43838]
3745 let x: &'static u32 = &0;
3748 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3751 my_macro!(Vec<i32>::new); // Always worked
3752 my_macro!(Vec::<i32>::new); // Now works
3757 - [Upgraded jemalloc to 4.5.0][43911]
3758 - [Enabled unwinding panics on Redox][43917]
3759 - [Now runs LLVM in parallel during translation phase.][43506]
3760 This should reduce peak memory usage.
3764 - [Generate builtin impls for `Clone` for all arrays and tuples that
3765 are `T: Clone`][43690]
3766 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3767 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3768 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3773 [`std::mem::discriminant`]
3777 - [You can now call `cargo install` with multiple package names][cargo/4216]
3778 - [Cargo commands inside a virtual workspace will now implicitly
3779 pass `--all`][cargo/4335]
3780 - [Added a `[patch]` section to `Cargo.toml` to handle
3781 prepublication dependencies][cargo/4123] [RFC 1969]
3782 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3783 like patterns][cargo/4270]
3784 - [Added the `--all-targets` option][cargo/4400]
3785 - [Using required dependencies as a feature is now deprecated and emits
3786 a warning][cargo/4364]
3791 - [Cargo docs are moving][43916]
3792 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3793 - [The rustdoc book is now available][43863]
3794 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3795 - [Added a preview of RLS has been made available through rustup][44204]
3796 Install with `rustup component add rls-preview`
3797 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3798 Previously only showed `std::os::unix`.
3802 - [Changes in method matching against higher-ranked types][43880] This may cause
3803 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3804 - [rustc's JSON error output's byte position start at top of file.][42973]
3805 Was previously relative to the rustc's internal `CodeMap` struct which
3806 required the unstable library `libsyntax` to correctly use.
3807 - [`unused_results` lint no longer ignores booleans][43728]
3809 [42565]: https://github.com/rust-lang/rust/pull/42565
3810 [42973]: https://github.com/rust-lang/rust/pull/42973
3811 [43348]: https://github.com/rust-lang/rust/pull/43348
3812 [43459]: https://github.com/rust-lang/rust/pull/43459
3813 [43506]: https://github.com/rust-lang/rust/pull/43506
3814 [43540]: https://github.com/rust-lang/rust/pull/43540
3815 [43690]: https://github.com/rust-lang/rust/pull/43690
3816 [43728]: https://github.com/rust-lang/rust/pull/43728
3817 [43838]: https://github.com/rust-lang/rust/pull/43838
3818 [43863]: https://github.com/rust-lang/rust/pull/43863
3819 [43880]: https://github.com/rust-lang/rust/pull/43880
3820 [43911]: https://github.com/rust-lang/rust/pull/43911
3821 [43916]: https://github.com/rust-lang/rust/pull/43916
3822 [43917]: https://github.com/rust-lang/rust/pull/43917
3823 [44204]: https://github.com/rust-lang/rust/pull/44204
3824 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3825 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3826 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3827 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3828 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3829 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3830 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3831 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3832 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3834 Version 1.20.0 (2017-08-31)
3835 ===========================
3839 - [Associated constants are now stabilised.][42809]
3840 - [A lot of macro bugs are now fixed.][42913]
3845 - [Struct fields are now properly coerced to the expected field type.][42807]
3846 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3847 `wasm32-experimental-emscripten` target.
3848 - [Changed some of the error messages to be more helpful.][42033]
3849 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3851 - [rustc now reports the total number of errors on compilation failure][43015]
3852 previously this was only the number of errors in the pass that failed.
3853 - [Expansion in rustc has been sped up 29x.][42533]
3854 - [added `msp430-none-elf` target.][43099]
3855 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3857 - [Fixes backtraces on Redox][43228]
3858 - [rustc now identifies different versions of same crate when absolute paths of
3859 different types match in an error message.][42826]
3865 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3866 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3868 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3869 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3870 - [Impl `Clone` for `DefaultHasher`.][42799]
3871 - [Impl `Sync` for `SyncSender`.][42397]
3872 - [Impl `FromStr` for `char`][42271]
3873 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3875 - [allow messages in the `unimplemented!()` macro.][42155]
3876 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3877 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3878 - [Upgrade to Unicode 10.0.0][42999]
3879 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3880 - [Skip the main thread's manual stack guard on Linux][43072]
3881 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3882 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3884 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3889 - [`CStr::into_c_string`]
3890 - [`CString::as_c_str`]
3891 - [`CString::into_boxed_c_str`]
3892 - [`Chain::get_mut`]
3893 - [`Chain::get_ref`]
3894 - [`Chain::into_inner`]
3895 - [`Option::get_or_insert_with`]
3896 - [`Option::get_or_insert`]
3897 - [`OsStr::into_os_string`]
3898 - [`OsString::into_boxed_os_str`]
3901 - [`Utf8Error::error_len`]
3902 - [`char::EscapeDebug`]
3903 - [`char::escape_debug`]
3904 - [`compile_error!`]
3905 - [`f32::from_bits`]
3907 - [`f64::from_bits`]
3909 - [`mem::ManuallyDrop`]
3910 - [`slice::sort_unstable_by_key`]
3911 - [`slice::sort_unstable_by`]
3912 - [`slice::sort_unstable`]
3913 - [`str::from_boxed_utf8_unchecked`]
3914 - [`str::as_bytes_mut`]
3915 - [`str::as_bytes_mut`]
3916 - [`str::from_utf8_mut`]
3917 - [`str::from_utf8_unchecked_mut`]
3919 - [`str::get_unchecked_mut`]
3920 - [`str::get_unchecked`]
3922 - [`str::into_boxed_bytes`]
3927 - [Cargo API token location moved from `~/.cargo/config` to
3928 `~/.cargo/credentials`.][cargo/3978]
3929 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3930 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3931 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3932 - [You can now specify version of a binary when installed through
3933 `cargo install` using `--vers`.][cargo/4229]
3934 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3935 failure.][cargo/4248]
3936 - [Changed the convention around which file is the crate root.][cargo/4259]
3937 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3938 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3943 - [Functions with `'static` in their return types will now not be as usable as
3944 if they were using lifetime parameters instead.][42417]
3945 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3946 takes the sign of NaN into account where previously didn't.][42430]
3948 [42033]: https://github.com/rust-lang/rust/pull/42033
3949 [42155]: https://github.com/rust-lang/rust/pull/42155
3950 [42271]: https://github.com/rust-lang/rust/pull/42271
3951 [42397]: https://github.com/rust-lang/rust/pull/42397
3952 [42417]: https://github.com/rust-lang/rust/pull/42417
3953 [42430]: https://github.com/rust-lang/rust/pull/42430
3954 [42431]: https://github.com/rust-lang/rust/pull/42431
3955 [42533]: https://github.com/rust-lang/rust/pull/42533
3956 [42571]: https://github.com/rust-lang/rust/pull/42571
3957 [42613]: https://github.com/rust-lang/rust/pull/42613
3958 [42799]: https://github.com/rust-lang/rust/pull/42799
3959 [42807]: https://github.com/rust-lang/rust/pull/42807
3960 [42809]: https://github.com/rust-lang/rust/pull/42809
3961 [42822]: https://github.com/rust-lang/rust/pull/42822
3962 [42826]: https://github.com/rust-lang/rust/pull/42826
3963 [42854]: https://github.com/rust-lang/rust/pull/42854
3964 [42913]: https://github.com/rust-lang/rust/pull/42913
3965 [42999]: https://github.com/rust-lang/rust/pull/42999
3966 [43011]: https://github.com/rust-lang/rust/pull/43011
3967 [43015]: https://github.com/rust-lang/rust/pull/43015
3968 [43072]: https://github.com/rust-lang/rust/pull/43072
3969 [43077]: https://github.com/rust-lang/rust/pull/43077
3970 [43097]: https://github.com/rust-lang/rust/pull/43097
3971 [43099]: https://github.com/rust-lang/rust/pull/43099
3972 [43170]: https://github.com/rust-lang/rust/pull/43170
3973 [43178]: https://github.com/rust-lang/rust/pull/43178
3974 [43185]: https://github.com/rust-lang/rust/pull/43185
3975 [43228]: https://github.com/rust-lang/rust/pull/43228
3976 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3977 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3978 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3979 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3980 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3981 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3982 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3983 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3984 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3985 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3986 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3987 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3988 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3989 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3990 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3991 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3992 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3993 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3994 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3995 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3996 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3997 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3998 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3999 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4000 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4001 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4002 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4003 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4004 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4005 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4006 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4007 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4008 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4009 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4010 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4011 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4012 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4013 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4014 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4017 Version 1.19.0 (2017-07-20)
4018 ===========================
4023 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4024 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4025 - [Macro recursion limit increased to 1024 from 64.][41676]
4026 - [Added lint for detecting unused macros.][41907]
4027 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4028 For example: `let x = loop { break 7; };`
4029 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4030 contain `Copy` types and cannot have a `Drop` implementation.
4031 Example: `union Foo { bar: u8, baz: usize }`
4032 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4033 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4038 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4039 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4040 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4041 you should use `--target armv7-linux-androideabi`.
4042 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4043 - [Minor optimisation of string operations.][42037]
4044 - [Compiler error message is now `aborting due to previous error(s)` instead of
4045 `aborting due to N previous errors`][42150] This was previously inaccurate and
4046 would only count certain kinds of errors.
4047 - [The compiler now supports Visual Studio 2017][42225]
4048 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4049 - [Added a lot][42264] of [new error codes][42302]
4050 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4051 libraries with C Run-time Libraries(CRT) to be statically linked.
4052 - [Fixed various ARM codegen bugs][42740]
4057 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4058 `Extend<Cow<'a, str>>`][41449]
4059 - [`Vec` now implements `From<&mut [T]>`][41530]
4060 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4061 - [`SplitWhitespace` now implements `Clone`][41659]
4062 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4064 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4065 macros, but for printing to stderr.
4070 - [`OsString::shrink_to_fit`]
4073 - [`thread::ThreadId`]
4078 - [Build scripts can now add environment variables to the environment
4079 the crate is being compiled in.
4080 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4081 - [Subcommands now replace the current process rather than spawning a new
4082 child process][cargo/3970]
4083 - [Workspace members can now accept glob file patterns][cargo/3979]
4084 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4085 the members in a given workspace.][cargo/3988]
4086 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4087 - [Target directory path is now in the cargo metadata][cargo/4022]
4088 - [Cargo no longer checks out a local working directory for the
4089 crates.io index][cargo/4026] This should provide smaller file size for the
4090 registry, and improve cloning times, especially on Windows machines.
4091 - [Added an `--exclude` option for excluding certain packages when using the
4092 `--all` option][cargo/4031]
4093 - [Cargo will now automatically retry when receiving a 5xx error
4094 from crates.io][cargo/4032]
4095 - [The `--features` option now accepts multiple comma or space
4096 delimited values.][cargo/4084]
4097 - [Added support for custom target specific runners][cargo/3954]
4102 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4104 - [Rust will now release XZ compressed packages][rust-installer/57]
4105 - [rustup will now prefer to download rust packages with
4106 XZ compression][rustup/1100] over GZip packages.
4107 - [Added the ability to escape `#` in rust documentation][41785] By adding
4108 additional `#`'s ie. `##` is now `#`
4113 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4114 - [`-Z` flags are now no longer allowed to be used on the stable
4115 compiler.][41751] This has been a warning for a year previous to this.
4116 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4117 longer works][42844]. Users should migrate to the built-in `check`
4118 command, which has been available since 1.16.
4119 - [Ending a float literal with `._` is now a hard error.
4120 Example: `42._` .][41946]
4121 - [Any use of a private `extern crate` outside of its module is now a
4122 hard error.][36886] This was previously a warning.
4123 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4124 relative while the `::` prefix makes a path absolute, but was ignored and the
4125 path was relative regardless.
4126 - [Floating point constants in match patterns is now a hard error][36890]
4127 This was previously a warning.
4128 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4129 match patterns is now a hard error][36891] This was previously a warning.
4130 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4132 - [From the pound escape, lines consisting of multiple `#`s are
4134 - [It is an error to re-export private enum variants][42460]. This is
4135 known to break a number of crates that depend on an older version of
4137 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4138 to use it to find the linker, and the build will fail where it did
4139 not previously][42607]
4141 [36886]: https://github.com/rust-lang/rust/issues/36886
4142 [36888]: https://github.com/rust-lang/rust/issues/36888
4143 [36890]: https://github.com/rust-lang/rust/issues/36890
4144 [36891]: https://github.com/rust-lang/rust/issues/36891
4145 [36892]: https://github.com/rust-lang/rust/issues/36892
4146 [37406]: https://github.com/rust-lang/rust/issues/37406
4147 [39983]: https://github.com/rust-lang/rust/pull/39983
4148 [41145]: https://github.com/rust-lang/rust/pull/41145
4149 [41192]: https://github.com/rust-lang/rust/pull/41192
4150 [41258]: https://github.com/rust-lang/rust/pull/41258
4151 [41370]: https://github.com/rust-lang/rust/pull/41370
4152 [41449]: https://github.com/rust-lang/rust/pull/41449
4153 [41530]: https://github.com/rust-lang/rust/pull/41530
4154 [41624]: https://github.com/rust-lang/rust/pull/41624
4155 [41656]: https://github.com/rust-lang/rust/pull/41656
4156 [41659]: https://github.com/rust-lang/rust/pull/41659
4157 [41676]: https://github.com/rust-lang/rust/pull/41676
4158 [41751]: https://github.com/rust-lang/rust/pull/41751
4159 [41764]: https://github.com/rust-lang/rust/pull/41764
4160 [41785]: https://github.com/rust-lang/rust/pull/41785
4161 [41873]: https://github.com/rust-lang/rust/pull/41873
4162 [41907]: https://github.com/rust-lang/rust/pull/41907
4163 [41946]: https://github.com/rust-lang/rust/pull/41946
4164 [42016]: https://github.com/rust-lang/rust/pull/42016
4165 [42037]: https://github.com/rust-lang/rust/pull/42037
4166 [42068]: https://github.com/rust-lang/rust/pull/42068
4167 [42150]: https://github.com/rust-lang/rust/pull/42150
4168 [42162]: https://github.com/rust-lang/rust/pull/42162
4169 [42225]: https://github.com/rust-lang/rust/pull/42225
4170 [42264]: https://github.com/rust-lang/rust/pull/42264
4171 [42302]: https://github.com/rust-lang/rust/pull/42302
4172 [42460]: https://github.com/rust-lang/rust/issues/42460
4173 [42607]: https://github.com/rust-lang/rust/issues/42607
4174 [42740]: https://github.com/rust-lang/rust/pull/42740
4175 [42844]: https://github.com/rust-lang/rust/issues/42844
4176 [42948]: https://github.com/rust-lang/rust/pull/42948
4177 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4178 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4179 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4180 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4181 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4182 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4183 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4184 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4185 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4186 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4187 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4188 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4189 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4190 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4191 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4192 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4193 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4194 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4195 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4196 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4197 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4198 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4201 Version 1.18.0 (2017-06-08)
4202 ===========================
4207 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4208 make the item visible to just that module tree. Also accepts the keyword
4209 `crate` to make something public to the whole crate but not users of the
4210 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4211 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4212 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4213 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4214 types like `Write + Send`, trailing `+` are now supported in trait objects,
4215 and better error reporting for trait objects starting with `?Sized`.
4216 - [0e+10 is now a valid floating point literal][40589]
4217 - [Now warns if you bind a lifetime parameter to 'static][40734]
4218 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4219 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4220 representation in some cases.][40377]
4225 - [rustc can now emit mir with `--emit mir`][39891]
4226 - [Improved LLVM IR for trivial functions][40367]
4227 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4228 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4229 opportunities found through profiling
4230 - [Improved backtrace formatting when panicking][38165]
4235 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4236 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4237 iteration or reallocation.
4238 - [Simplified HashMap Bucket interface][40561] provides performance
4239 improvements for iterating and cloning.
4240 - [Specialize Vec::from_elem to use calloc][40409]
4241 - [Fixed Race condition in fs::create_dir_all][39799]
4242 - [No longer caching stdio on Windows][40516]
4243 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4244 2.50%~ faster and in one case now 12.50% faster.
4245 - [Optimized `AtomicBool::fetch_nand`][41143]
4250 - [`Child::try_wait`]
4251 - [`HashMap::retain`]
4252 - [`HashSet::retain`]
4254 - [`TcpStream::peek`]
4255 - [`UdpSocket::peek`]
4256 - [`UdpSocket::peek_from`]
4261 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4262 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4263 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4264 - [Added Android build support][cargo/3885]
4265 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4266 of a certain type, for example `cargo build --bins` will build all
4268 - [Added support for haiku][cargo/3952]
4273 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4274 - [Added rust-windbg script for better debugging on Windows][39983]
4275 - [Rust now uses the official cross compiler for NetBSD][40612]
4276 - [rustdoc now accepts `#` at the start of files][40828]
4277 - [Fixed jemalloc support for musl][41168]
4282 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4283 always placed after the sign if it exists and before the digits. With the `#`
4284 flag the zeroes are placed after the prefix and before the digits.
4285 - [Due to the struct field optimisation][40377], using `transmute` on structs
4286 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4287 always been undefined behavior, but is now more likely to break in practice.
4288 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4289 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4290 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4291 - [Overlapping inherent `impl`s are now a hard error][40728]
4292 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4293 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4294 `out.asm` and `out.ll` instead of only one of the filetypes.
4295 - [ calling a function that returns `Self` will no longer work][41805] when
4296 the size of `Self` cannot be statically determined.
4297 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4298 this has caused a few regressions namely:
4300 - Changed the link order of local static/dynamic libraries (respecting the
4301 order on given rather than having the compiler reorder).
4302 - Changed how MinGW is linked, native code linked to dynamic libraries
4303 may require manually linking to the gcc support library (for the native
4306 [38165]: https://github.com/rust-lang/rust/pull/38165
4307 [39799]: https://github.com/rust-lang/rust/pull/39799
4308 [39891]: https://github.com/rust-lang/rust/pull/39891
4309 [39983]: https://github.com/rust-lang/rust/pull/39983
4310 [40043]: https://github.com/rust-lang/rust/pull/40043
4311 [40241]: https://github.com/rust-lang/rust/pull/40241
4312 [40338]: https://github.com/rust-lang/rust/pull/40338
4313 [40367]: https://github.com/rust-lang/rust/pull/40367
4314 [40377]: https://github.com/rust-lang/rust/pull/40377
4315 [40409]: https://github.com/rust-lang/rust/pull/40409
4316 [40516]: https://github.com/rust-lang/rust/pull/40516
4317 [40556]: https://github.com/rust-lang/rust/pull/40556
4318 [40561]: https://github.com/rust-lang/rust/pull/40561
4319 [40589]: https://github.com/rust-lang/rust/pull/40589
4320 [40612]: https://github.com/rust-lang/rust/pull/40612
4321 [40723]: https://github.com/rust-lang/rust/pull/40723
4322 [40728]: https://github.com/rust-lang/rust/pull/40728
4323 [40731]: https://github.com/rust-lang/rust/pull/40731
4324 [40734]: https://github.com/rust-lang/rust/pull/40734
4325 [40805]: https://github.com/rust-lang/rust/pull/40805
4326 [40807]: https://github.com/rust-lang/rust/pull/40807
4327 [40828]: https://github.com/rust-lang/rust/pull/40828
4328 [40870]: https://github.com/rust-lang/rust/pull/40870
4329 [41085]: https://github.com/rust-lang/rust/pull/41085
4330 [41143]: https://github.com/rust-lang/rust/pull/41143
4331 [41168]: https://github.com/rust-lang/rust/pull/41168
4332 [41270]: https://github.com/rust-lang/rust/issues/41270
4333 [41469]: https://github.com/rust-lang/rust/pull/41469
4334 [41805]: https://github.com/rust-lang/rust/issues/41805
4335 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4336 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4337 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4338 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4339 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4340 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4341 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4342 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4343 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4344 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4345 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4346 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4347 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4348 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4351 Version 1.17.0 (2017-04-27)
4352 ===========================
4357 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4358 * [Fields of structs may be initialized without duplicating the field/variable
4359 names][39761]. [RFC 1682]
4360 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4361 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4362 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4363 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4364 `'b`. Soundness fix.
4365 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4366 * [Static variables may contain references to other statics][40027]
4371 * [Exit quickly on only `--emit dep-info`][40336]
4372 * [Make `-C relocation-model` more correctly determine whether the linker
4373 creates a position-independent executable][40245]
4374 * [Add `-C overflow-checks` to directly control whether integer overflow
4376 * [The rustc type checker now checks items on demand instead of in a single
4377 in-order pass][40008]. This is mostly an internal refactoring in support of
4378 future work, including incremental type checking, but also resolves [RFC
4379 1647], allowing `Self` to appear in `impl` `where` clauses.
4380 * [Optimize vtable loads][39995]
4381 * [Turn off vectorization for Emscripten targets][39990]
4382 * [Provide suggestions for unknown macros imported with `use`][39953]
4383 * [Fix ICEs in path resolution][39939]
4384 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4385 * [Add clearer error message using `&str + &str`][39116]
4396 * [`Ordering::then`]
4397 * [`Ordering::then_with`]
4398 * [`BTreeMap::range`]
4399 * [`BTreeMap::range_mut`]
4400 * [`collections::Bound`]
4401 * [`process::abort`]
4402 * [`ptr::read_unaligned`]
4403 * [`ptr::write_unaligned`]
4404 * [`Result::expect_err`]
4407 * [`Cell::into_inner`]
4413 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4414 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4415 * [`String` implements `FromIterator<&char>`][40028]
4416 * `Box` [implements][40009] a number of new conversions:
4417 `From<Box<str>> for String`,
4418 `From<Box<[T]>> for Vec<T>`,
4419 `From<Box<CStr>> for CString`,
4420 `From<Box<OsStr>> for OsString`,
4421 `From<Box<Path>> for PathBuf`,
4422 `Into<Box<str>> for String`,
4423 `Into<Box<[T]>> for Vec<T>`,
4424 `Into<Box<CStr>> for CString`,
4425 `Into<Box<OsStr>> for OsString`,
4426 `Into<Box<Path>> for PathBuf`,
4427 `Default for Box<str>`,
4428 `Default for Box<CStr>`,
4429 `Default for Box<OsStr>`,
4430 `From<&CStr> for Box<CStr>`,
4431 `From<&OsStr> for Box<OsStr>`,
4432 `From<&Path> for Box<Path>`
4433 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4434 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4435 * [Slightly optimize `slice::sort`][39538]
4436 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4437 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4438 `Box<str>` implements `From<&str>`][39438]
4439 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4440 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4441 * [`format!` estimates the needed capacity before writing a string][39356]
4442 * [Support unprivileged symlink creation in Windows][38921]
4443 * [`PathBuf` implements `Default`][38764]
4444 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4445 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4446 and poor hash functions.
4451 * [Add `cargo check --all`][cargo/3731]
4452 * [Add an option to ignore SSL revocation checking][cargo/3699]
4453 * [Add `cargo run --package`][cargo/3691]
4454 * [Add `required_features`][cargo/3667]
4455 * [Assume `build.rs` is a build script][cargo/3664]
4456 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4461 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4463 * [The "Unstable Book" documents nightly-only features][ubook]
4464 * [Improve the style of the sidebar in rustdoc output][40265]
4465 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4466 * [Fix MSP430 breakage due to `i128`][40257]
4467 * [Preliminary Solaris/SPARCv9 support][39903]
4468 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4469 run without installing the MSVC runtime.
4470 * [`rustdoc --test` includes file names in test names][39788]
4471 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4472 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4473 * [Initial support for `aarch64-unknown-freebsd`][39491]
4474 * [Initial support for `i686-unknown-netbsd`][39426]
4475 * [This release no longer includes the old makefile build system][39431]. Rust
4476 is built with a custom build system, written in Rust, and with Cargo.
4477 * [Add Debug implementations for libcollection structs][39002]
4478 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4479 * [`--test-threads=0` produces an error][38945]
4480 * [`rustup` installs documentation by default][40526]
4481 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4482 WinDbg and Visual Studio to improve the debugging experience.
4487 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4488 workaround, either use MSVC 2015 or run vcvars.bat.
4489 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4490 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4491 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4493 * [`format!` and `Display::to_string` panic if an underlying formatting
4494 implementation returns an error][40117]. Previously the error was silently
4495 ignored. It is incorrect for `write_fmt` to return an error when writing
4497 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4498 crates were marked stable and could be accessed from the stable toolchain.
4499 * [Rust git source no longer includes vendored crates][39728]. Those that need
4500 to build with vendored crates should build from release tarballs.
4501 * [Fix inert attributes from `proc_macro_derives`][39572]
4502 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4503 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4505 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4506 existing code generally ignores the type of dead-code unless a type-hint is
4507 provided; this can cause surprising inference interactions particularly around
4508 defaulting. The new code uniformly ignores the result type of dead-code.
4509 * [Tuple-struct constructors with private fields are no longer visible][38932]
4510 * [Lifetime parameters that do not appear in the arguments are now considered
4511 early-bound][38897], resolving a soundness bug (#[32330]). The
4512 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4514 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4515 * [Make transmuting from fn item types to pointer-sized types a hard
4518 [27787]: https://github.com/rust-lang/rust/issues/27787
4519 [32330]: https://github.com/rust-lang/rust/issues/32330
4520 [34198]: https://github.com/rust-lang/rust/pull/34198
4521 [38161]: https://github.com/rust-lang/rust/pull/38161
4522 [38368]: https://github.com/rust-lang/rust/pull/38368
4523 [38584]: https://github.com/rust-lang/rust/issues/38584
4524 [38661]: https://github.com/rust-lang/rust/pull/38661
4525 [38764]: https://github.com/rust-lang/rust/pull/38764
4526 [38864]: https://github.com/rust-lang/rust/issues/38864
4527 [38897]: https://github.com/rust-lang/rust/pull/38897
4528 [38921]: https://github.com/rust-lang/rust/pull/38921
4529 [38932]: https://github.com/rust-lang/rust/pull/38932
4530 [38945]: https://github.com/rust-lang/rust/pull/38945
4531 [38981]: https://github.com/rust-lang/rust/pull/38981
4532 [39002]: https://github.com/rust-lang/rust/pull/39002
4533 [39116]: https://github.com/rust-lang/rust/pull/39116
4534 [39193]: https://github.com/rust-lang/rust/pull/39193
4535 [39265]: https://github.com/rust-lang/rust/pull/39265
4536 [39356]: https://github.com/rust-lang/rust/pull/39356
4537 [39372]: https://github.com/rust-lang/rust/pull/39372
4538 [39426]: https://github.com/rust-lang/rust/pull/39426
4539 [39431]: https://github.com/rust-lang/rust/pull/39431
4540 [39438]: https://github.com/rust-lang/rust/pull/39438
4541 [39440]: https://github.com/rust-lang/rust/pull/39440
4542 [39485]: https://github.com/rust-lang/rust/pull/39485
4543 [39491]: https://github.com/rust-lang/rust/pull/39491
4544 [39518]: https://github.com/rust-lang/rust/pull/39518
4545 [39538]: https://github.com/rust-lang/rust/pull/39538
4546 [39572]: https://github.com/rust-lang/rust/pull/39572
4547 [39633]: https://github.com/rust-lang/rust/pull/39633
4548 [39642]: https://github.com/rust-lang/rust/pull/39642
4549 [39728]: https://github.com/rust-lang/rust/pull/39728
4550 [39761]: https://github.com/rust-lang/rust/pull/39761
4551 [39788]: https://github.com/rust-lang/rust/pull/39788
4552 [39793]: https://github.com/rust-lang/rust/pull/39793
4553 [39837]: https://github.com/rust-lang/rust/pull/39837
4554 [39843]: https://github.com/rust-lang/rust/pull/39843
4555 [39851]: https://github.com/rust-lang/rust/pull/39851
4556 [39903]: https://github.com/rust-lang/rust/pull/39903
4557 [39939]: https://github.com/rust-lang/rust/pull/39939
4558 [39953]: https://github.com/rust-lang/rust/pull/39953
4559 [39960]: https://github.com/rust-lang/rust/pull/39960
4560 [39990]: https://github.com/rust-lang/rust/pull/39990
4561 [39995]: https://github.com/rust-lang/rust/pull/39995
4562 [40008]: https://github.com/rust-lang/rust/pull/40008
4563 [40009]: https://github.com/rust-lang/rust/pull/40009
4564 [40027]: https://github.com/rust-lang/rust/pull/40027
4565 [40028]: https://github.com/rust-lang/rust/pull/40028
4566 [40037]: https://github.com/rust-lang/rust/pull/40037
4567 [40117]: https://github.com/rust-lang/rust/pull/40117
4568 [40166]: https://github.com/rust-lang/rust/pull/40166
4569 [40245]: https://github.com/rust-lang/rust/pull/40245
4570 [40257]: https://github.com/rust-lang/rust/pull/40257
4571 [40261]: https://github.com/rust-lang/rust/pull/40261
4572 [40265]: https://github.com/rust-lang/rust/pull/40265
4573 [40319]: https://github.com/rust-lang/rust/pull/40319
4574 [40336]: https://github.com/rust-lang/rust/pull/40336
4575 [40526]: https://github.com/rust-lang/rust/pull/40526
4576 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4577 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4578 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4579 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4580 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4581 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4582 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4583 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4584 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4585 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4586 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4587 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4588 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4589 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4590 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4591 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4592 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4593 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4594 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4595 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4596 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4597 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4598 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4599 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4600 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4601 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4602 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4603 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4604 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4605 [mdbook]: https://crates.io/crates/mdbook
4606 [ubook]: https://doc.rust-lang.org/unstable-book/
4609 Version 1.16.0 (2017-03-16)
4610 ===========================
4615 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4616 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4617 match patterns][38069]
4618 * [Clean up semantics of `self` in an import list][38313]
4619 * [`Self` may appear in `impl` headers][38920]
4620 * [`Self` may appear in struct expressions][39282]
4625 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4626 a `.rmeta` file containing only crate metadata][38571]. This can be
4627 used by tools like the Rust Language Service to perform
4628 metadata-only builds.
4629 * [Levenshtein based typo suggestions now work in most places, while
4630 previously they worked only for fields and sometimes for local
4631 variables][38927]. Together with the overhaul of "no
4632 resolution"/"unexpected resolution" errors (#[38154]) they result in
4633 large and systematic improvement in resolution diagnostics.
4634 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4636 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4637 * [`rustc` no longer attempts to provide "consider using an explicit
4638 lifetime" suggestions][37057]. They were inaccurate.
4643 * [`VecDeque::truncate`]
4644 * [`VecDeque::resize`]
4645 * [`String::insert_str`]
4646 * [`Duration::checked_add`]
4647 * [`Duration::checked_sub`]
4648 * [`Duration::checked_div`]
4649 * [`Duration::checked_mul`]
4652 * [`SocketAddr::is_ipv4`]
4653 * [`SocketAddr::is_ipv6`]
4654 * [`IpAddr::is_ipv4`]
4655 * [`IpAddr::is_ipv6`]
4657 * [`Vec::dedup_by_key`]
4658 * [`Result::unwrap_or_default`]
4659 * [`<*const T>::wrapping_offset`]
4660 * [`<*mut T>::wrapping_offset`]
4661 * `CommandExt::creation_flags`
4662 * [`File::set_permissions`]
4663 * [`String::split_off`]
4668 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4669 their argument by `Borrow` parameter][37761]
4670 * [All public types in std implement `Debug`][38006]
4671 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4672 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4673 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4675 * [std: Fix partial writes in `LineWriter`][38062]
4676 * [std: Clamp max read/write sizes on Unix][38062]
4677 * [Use more specific panic message for `&str` slicing errors][38066]
4678 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4679 functionality cannot be achieved in std currently.
4680 * [`writeln!`, like `println!`, now accepts a form with no string
4681 or formatting arguments, to just print a newline][38469]
4682 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4683 * [Reduce the size of static data in `std_unicode::tables`][38781]
4684 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4685 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4687 * [`Duration` implements `Sum`][38712]
4688 * [`String` implements `ToSocketAddrs`][39048]
4693 * [The `cargo check` command does a type check of a project without
4694 building it][cargo/3296]
4695 * [crates.io will display CI badges from Travis and AppVeyor, if
4696 specified in Cargo.toml][cargo/3546]
4697 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4698 * [Compilation profiles accept integer values for `debug`, in addition
4699 to `true` and `false`. These are passed to `rustc` as the value to
4700 `-C debuginfo`][cargo/3534]
4701 * [Implement `cargo --version --verbose`][cargo/3604]
4702 * [All builds now output 'dep-info' build dependencies compatible with
4703 make and ninja][cargo/3557]
4704 * [Build all workspace members with `build --all`][cargo/3511]
4705 * [Document all workspace members with `doc --all`][cargo/3515]
4706 * [Path deps outside workspace are not members][cargo/3443]
4711 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4712 the path to the Rust implementation][38589]
4713 * [The `armv7-linux-androideabi` target no longer enables NEON
4714 extensions, per Google's ABI guide][38413]
4715 * [The stock standard library can be compiled for Redox OS][38401]
4716 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4718 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4720 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4725 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4726 match patterns][38069]
4727 * In this release, references to uninhabited types can not be
4728 pattern-matched. This was accidentally allowed in 1.15.
4729 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4730 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4732 * [Clean up semantics of `self` in an import list][38313]
4733 * Reimplemented lifetime elision. This change was almost entirely compatible
4734 with existing code, but it did close a number of small bugs and loopholes,
4735 as well as being more accepting in some other [cases][41105].
4737 [37057]: https://github.com/rust-lang/rust/pull/37057
4738 [37761]: https://github.com/rust-lang/rust/pull/37761
4739 [38006]: https://github.com/rust-lang/rust/pull/38006
4740 [38051]: https://github.com/rust-lang/rust/pull/38051
4741 [38062]: https://github.com/rust-lang/rust/pull/38062
4742 [38062]: https://github.com/rust-lang/rust/pull/38622
4743 [38066]: https://github.com/rust-lang/rust/pull/38066
4744 [38069]: https://github.com/rust-lang/rust/pull/38069
4745 [38131]: https://github.com/rust-lang/rust/pull/38131
4746 [38154]: https://github.com/rust-lang/rust/pull/38154
4747 [38274]: https://github.com/rust-lang/rust/pull/38274
4748 [38304]: https://github.com/rust-lang/rust/pull/38304
4749 [38313]: https://github.com/rust-lang/rust/pull/38313
4750 [38314]: https://github.com/rust-lang/rust/pull/38314
4751 [38327]: https://github.com/rust-lang/rust/pull/38327
4752 [38401]: https://github.com/rust-lang/rust/pull/38401
4753 [38413]: https://github.com/rust-lang/rust/pull/38413
4754 [38469]: https://github.com/rust-lang/rust/pull/38469
4755 [38559]: https://github.com/rust-lang/rust/pull/38559
4756 [38571]: https://github.com/rust-lang/rust/pull/38571
4757 [38580]: https://github.com/rust-lang/rust/pull/38580
4758 [38589]: https://github.com/rust-lang/rust/pull/38589
4759 [38670]: https://github.com/rust-lang/rust/pull/38670
4760 [38712]: https://github.com/rust-lang/rust/pull/38712
4761 [38726]: https://github.com/rust-lang/rust/pull/38726
4762 [38781]: https://github.com/rust-lang/rust/pull/38781
4763 [38798]: https://github.com/rust-lang/rust/pull/38798
4764 [38909]: https://github.com/rust-lang/rust/pull/38909
4765 [38920]: https://github.com/rust-lang/rust/pull/38920
4766 [38927]: https://github.com/rust-lang/rust/pull/38927
4767 [39048]: https://github.com/rust-lang/rust/pull/39048
4768 [39282]: https://github.com/rust-lang/rust/pull/39282
4769 [39379]: https://github.com/rust-lang/rust/pull/39379
4770 [41105]: https://github.com/rust-lang/rust/issues/41105
4771 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4772 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4773 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4774 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4775 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4776 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4777 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4778 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4779 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4780 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4781 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4782 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4783 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4784 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4785 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4786 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4787 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4788 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4789 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4790 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4791 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4792 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4793 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4794 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4795 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4796 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4797 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4798 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4799 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4800 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4803 Version 1.15.1 (2017-02-09)
4804 ===========================
4806 * [Fix IntoIter::as_mut_slice's signature][39466]
4807 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4809 [39466]: https://github.com/rust-lang/rust/pull/39466
4810 [39523]: https://github.com/rust-lang/rust/pull/39523
4813 Version 1.15.0 (2017-02-02)
4814 ===========================
4819 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4820 stable. This allows popular code-generating crates like Serde and Diesel to
4821 work ergonomically. [RFC 1681].
4822 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4823 with curly braces][36868]. Part of [RFC 1506].
4824 * [A number of minor changes to name resolution have been activated][37127].
4825 They add up to more consistent semantics, allowing for future evolution of
4826 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4827 details of what is different. The breaking changes here have been transitioned
4828 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4829 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4831 * [`?Sized` can be used in `where` clauses][37791]
4832 * [There is now a limit on the size of monomorphized types and it can be
4833 modified with the `#![type_size_limit]` crate attribute, similarly to
4834 the `#![recursion_limit]` attribute][37789]
4839 * [On Windows, the compiler will apply dllimport attributes when linking to
4840 extern functions][37973]. Additional attributes and flags can control which
4841 library kind is linked and its name. [RFC 1717].
4842 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4843 * [The `--test` flag works with procedural macro crates][38107]
4844 * [Fix `extern "aapcs" fn` ABI][37814]
4845 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4846 * [The `format!` expander recognizes incorrect `printf` and shell-style
4847 formatting directives and suggests the correct format][37613].
4848 * [Only report one error for all unused imports in an import list][37456]
4850 Compiler Performance
4851 --------------------
4853 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4854 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4855 * [Don't clone in `UnificationTable::probe`][37848]
4856 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4857 * [Use small vectors in type walker][37760]
4858 * [Macro expansion performance was improved][37701]
4859 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4860 * [Replace FNV with a faster hash function][37229]
4865 * [`std::iter::Iterator::min_by`]
4866 * [`std::iter::Iterator::max_by`]
4867 * [`std::os::*::fs::FileExt`]
4868 * [`std::sync::atomic::Atomic*::get_mut`]
4869 * [`std::sync::atomic::Atomic*::into_inner`]
4870 * [`std::vec::IntoIter::as_slice`]
4871 * [`std::vec::IntoIter::as_mut_slice`]
4872 * [`std::sync::mpsc::Receiver::try_iter`]
4873 * [`std::os::unix::process::CommandExt::before_exec`]
4874 * [`std::rc::Rc::strong_count`]
4875 * [`std::rc::Rc::weak_count`]
4876 * [`std::sync::Arc::strong_count`]
4877 * [`std::sync::Arc::weak_count`]
4878 * [`std::char::encode_utf8`]
4879 * [`std::char::encode_utf16`]
4880 * [`std::cell::Ref::clone`]
4881 * [`std::io::Take::into_inner`]
4886 * [The standard sorting algorithm has been rewritten for dramatic performance
4887 improvements][38192]. It is a hybrid merge sort, drawing influences from
4888 Timsort. Previously it was a naive merge sort.
4889 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4890 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4892 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4893 and `char_indices().last()`][37882]
4894 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4895 * [Chinese characters display correctly in `fmt::Debug`][37855]
4896 * [Derive `Default` for `Duration`][37699]
4897 * [Support creation of anonymous pipes on WinXP/2k][37677]
4898 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4899 * [Don't pass overlapped handles to processes][38835]
4904 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4905 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4906 should instead check the variable at runtime with `std::env`. That the value
4907 was set at build time was a bug, and incorrect when cross-compiling. This
4908 change is known to cause breakage.
4909 * [Add `--all` flag to `cargo test`][cargo/3221]
4910 * [Compile statically against the MSVC CRT][cargo/3363]
4911 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4912 * [Link OpenSSL statically on OSX][cargo/3311]
4913 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4914 * [Test for bad path overrides with summaries][cargo/3336]
4915 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4916 * [Fix retrying crate downloads for network errors][cargo/3348]
4917 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4918 * [Emit more info on --message-format=json][cargo/3319]
4919 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4920 * [Don't ignore errors in workspace manifest][cargo/3409]
4921 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4926 * [Test runners (binaries built with `--test`) now support a `--list` argument
4927 that lists the tests it contains][38185]
4928 * [Test runners now support a `--exact` argument that makes the test filter
4929 match exactly, instead of matching only a substring of the test name][38181]
4930 * [rustdoc supports a `--playground-url` flag][37763]
4931 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4936 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4937 continue to be used in this release by passing `--disable-rustbuild` to the
4938 configure script, but they will be deleted soon. Note that the new build
4939 system uses a different on-disk layout that will likely affect any scripts
4941 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4943 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4944 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4950 * [A number of minor changes to name resolution have been activated][37127].
4951 They add up to more consistent semantics, allowing for future evolution of
4952 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4953 details of what is different. The breaking changes here have been transitioned
4954 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4955 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4956 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4957 should instead check the variable at runtime with `std::env`. That the value
4958 was set at build time was a bug, and incorrect when cross-compiling. This
4959 change is known to cause breakage.
4960 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4961 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4962 1.10 and is now an error by default. It will become a hard error in the near
4964 * [The semantics relating modules to file system directories are changing in
4965 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4966 lint, which is a warning in this release, and will become a hard error in the
4968 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4969 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4970 the underlying iterator][37834]
4972 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4973 [33685]: https://github.com/rust-lang/rust/issues/33685
4974 [36868]: https://github.com/rust-lang/rust/pull/36868
4975 [37127]: https://github.com/rust-lang/rust/pull/37127
4976 [37229]: https://github.com/rust-lang/rust/pull/37229
4977 [37456]: https://github.com/rust-lang/rust/pull/37456
4978 [37527]: https://github.com/rust-lang/rust/pull/37527
4979 [37602]: https://github.com/rust-lang/rust/pull/37602
4980 [37613]: https://github.com/rust-lang/rust/pull/37613
4981 [37615]: https://github.com/rust-lang/rust/pull/37615
4982 [37636]: https://github.com/rust-lang/rust/pull/37636
4983 [37627]: https://github.com/rust-lang/rust/pull/37627
4984 [37642]: https://github.com/rust-lang/rust/pull/37642
4985 [37677]: https://github.com/rust-lang/rust/pull/37677
4986 [37699]: https://github.com/rust-lang/rust/pull/37699
4987 [37701]: https://github.com/rust-lang/rust/pull/37701
4988 [37705]: https://github.com/rust-lang/rust/pull/37705
4989 [37749]: https://github.com/rust-lang/rust/pull/37749
4990 [37760]: https://github.com/rust-lang/rust/pull/37760
4991 [37763]: https://github.com/rust-lang/rust/pull/37763
4992 [37764]: https://github.com/rust-lang/rust/pull/37764
4993 [37789]: https://github.com/rust-lang/rust/pull/37789
4994 [37791]: https://github.com/rust-lang/rust/pull/37791
4995 [37814]: https://github.com/rust-lang/rust/pull/37814
4996 [37817]: https://github.com/rust-lang/rust/pull/37817
4997 [37834]: https://github.com/rust-lang/rust/pull/37834
4998 [37848]: https://github.com/rust-lang/rust/pull/37848
4999 [37855]: https://github.com/rust-lang/rust/pull/37855
5000 [37882]: https://github.com/rust-lang/rust/pull/37882
5001 [37888]: https://github.com/rust-lang/rust/pull/37888
5002 [37973]: https://github.com/rust-lang/rust/pull/37973
5003 [37979]: https://github.com/rust-lang/rust/pull/37979
5004 [38086]: https://github.com/rust-lang/rust/pull/38086
5005 [38107]: https://github.com/rust-lang/rust/pull/38107
5006 [38117]: https://github.com/rust-lang/rust/pull/38117
5007 [38134]: https://github.com/rust-lang/rust/pull/38134
5008 [38146]: https://github.com/rust-lang/rust/pull/38146
5009 [38181]: https://github.com/rust-lang/rust/pull/38181
5010 [38182]: https://github.com/rust-lang/rust/pull/38182
5011 [38185]: https://github.com/rust-lang/rust/pull/38185
5012 [38192]: https://github.com/rust-lang/rust/pull/38192
5013 [38279]: https://github.com/rust-lang/rust/pull/38279
5014 [38835]: https://github.com/rust-lang/rust/pull/38835
5015 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5016 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5017 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5018 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5019 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5020 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5021 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5022 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5023 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5024 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5025 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5026 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5027 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5028 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5029 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5030 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5031 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5032 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5033 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5034 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5035 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5036 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5037 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5038 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5039 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5040 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5041 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5042 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5043 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5044 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5045 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5046 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5047 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5048 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5049 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5050 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5051 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5052 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5055 Version 1.14.0 (2016-12-22)
5056 ===========================
5061 * [`..` matches multiple tuple fields in enum variants, structs
5062 and tuples][36843]. [RFC 1492].
5063 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5064 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5065 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5066 dereferencing][36822]
5071 * [Mark enums with non-zero discriminant as non-zero][37224]
5072 * [Lower-case `static mut` names are linted like other
5073 statics and consts][37162]
5074 * [Fix ICE on some macros in const integer positions
5075 (e.g. `[u8; m!()]`)][36819]
5076 * [Improve error message and snippet for "did you mean `x`"][36798]
5077 * [Add a panic-strategy field to the target specification][36794]
5078 * [Include LLVM version in `--version --verbose`][37200]
5080 Compile-time Optimizations
5081 --------------------------
5083 * [Improve macro expansion performance][37569]
5084 * [Shrink `Expr_::ExprInlineAsm`][37445]
5085 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5086 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5087 * [Avoid more allocations when compiling html5ever][37373]
5088 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5089 * [Avoid some allocations in the macro parser][37318]
5090 * [Use a faster deflate setting][37298]
5091 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5092 during interning of slices][37270]
5093 * [Optimize `write_metadata`][37267]
5094 * [Don't process obligation forest cycles when stalled][37231]
5095 * [Avoid many `CrateConfig` clones][37161]
5096 * [Optimize `Substs::super_fold_with`][37108]
5097 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5098 * [Speed up `plug_leaks`][36917]
5103 * [`println!()`, with no arguments, prints newline][36825].
5104 Previously, an empty string was required to achieve the same.
5105 * [`Wrapping` impls standard binary and unary operators, as well as
5106 the `Sum` and `Product` iterators][37356]
5107 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5109 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5110 `VecDeque` iterators][37315]
5111 * [Improve `SipHasher` performance on small values][37312]
5112 * [Add Iterator trait TrustedLen to enable better FromIterator /
5114 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5115 * [`ReadDir` implements `Debug`][37221]
5116 * [Implement `RefUnwindSafe` for atomic types][37178]
5117 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5118 * [Avoid allocations in `Decoder::read_str`][37064]
5119 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5120 * [Impl `Debug` for raw pointers to unsized data][36880]
5121 * [Don't reuse `HashMap` random seeds][37470]
5122 * [The internal memory layout of `HashMap` is more cache-friendly, for
5123 significant improvements in some operations][36692]
5124 * [`HashMap` uses less memory on 32-bit architectures][36595]
5125 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5130 * [Expose rustc cfg values to build scripts][cargo/3243]
5131 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5132 * [Fix passing --features when testing multiple packages][cargo/3280]
5133 * [Use a single profile set per workspace][cargo/3249]
5134 * [Load `replace` sections from lock files][cargo/3220]
5135 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5140 * [rustup is the recommended Rust installation method][1.14rustup]
5141 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5142 S390x. These are [tier 2] platforms and may have major defects. Follow the
5143 instructions on the website to install, or add the targets to an existing
5144 installation with `rustup target add`. The new target triples are:
5145 - `mips-unknown-linux-gnu`
5146 - `mipsel-unknown-linux-gnu`
5147 - `mips64-unknown-linux-gnuabi64`
5148 - `mips64el-unknown-linux-gnuabi64 `
5149 - `powerpc-unknown-linux-gnu`
5150 - `powerpc64-unknown-linux-gnu`
5151 - `powerpc64le-unknown-linux-gnu`
5152 - `s390x-unknown-linux-gnu `
5153 * This release includes target (std) builds for ARM Linux running MUSL
5154 libc. These are [tier 2] platforms and may have major defects. Add the
5155 following triples to an existing rustup installation with `rustup target add`:
5156 - `arm-unknown-linux-musleabi`
5157 - `arm-unknown-linux-musleabihf`
5158 - `armv7-unknown-linux-musleabihf`
5159 * This release includes [experimental support for WebAssembly][1.14wasm], via
5160 the `wasm32-unknown-emscripten` target. This target is known to have major
5161 defects. Please test, report, and fix.
5162 * rustup no longer installs documentation by default. Run `rustup
5163 component add rust-docs` to install.
5164 * [Fix line stepping in debugger][37310]
5165 * [Enable line number debuginfo in releases][37280]
5170 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5171 * [Add support for Fuchsia OS][37313]
5172 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5177 * [A number of forward-compatibility lints used by the compiler
5178 to gradually introduce language changes have been converted
5179 to deny by default][36894]:
5180 - ["use of inaccessible extern crate erroneously allowed"][36886]
5181 - ["type parameter default erroneously allowed in invalid location"][36887]
5182 - ["detects super or self keywords at the beginning of global path"][36888]
5183 - ["two overlapping inherent impls define an item with the same name
5184 were erroneously allowed"][36889]
5185 - ["floating-point constants cannot be used in patterns"][36890]
5186 - ["constants of struct or enum type can only be used in a pattern if
5187 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5188 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5189 * [Prohibit patterns in trait methods without bodies][37378]
5190 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5191 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5192 * [The `$crate` macro variable is accepted in fewer locations][37213]
5193 * [Impls specifying extra region requirements beyond the trait
5194 they implement are rejected][37167]
5195 * [Enums may not be unsized][37111]. Unsized enums are intended to
5196 work but never have. For now they are forbidden.
5197 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5199 [tier 2]: https://forge.rust-lang.org/platform-support.html
5200 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5201 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5202 [36430]: https://github.com/rust-lang/rust/pull/36430
5203 [36595]: https://github.com/rust-lang/rust/pull/36595
5204 [36595]: https://github.com/rust-lang/rust/pull/36595
5205 [36692]: https://github.com/rust-lang/rust/pull/36692
5206 [36767]: https://github.com/rust-lang/rust/pull/36767
5207 [36794]: https://github.com/rust-lang/rust/pull/36794
5208 [36798]: https://github.com/rust-lang/rust/pull/36798
5209 [36819]: https://github.com/rust-lang/rust/pull/36819
5210 [36822]: https://github.com/rust-lang/rust/pull/36822
5211 [36825]: https://github.com/rust-lang/rust/pull/36825
5212 [36843]: https://github.com/rust-lang/rust/pull/36843
5213 [36880]: https://github.com/rust-lang/rust/pull/36880
5214 [36886]: https://github.com/rust-lang/rust/issues/36886
5215 [36887]: https://github.com/rust-lang/rust/issues/36887
5216 [36888]: https://github.com/rust-lang/rust/issues/36888
5217 [36889]: https://github.com/rust-lang/rust/issues/36889
5218 [36890]: https://github.com/rust-lang/rust/issues/36890
5219 [36891]: https://github.com/rust-lang/rust/issues/36891
5220 [36892]: https://github.com/rust-lang/rust/issues/36892
5221 [36894]: https://github.com/rust-lang/rust/pull/36894
5222 [36917]: https://github.com/rust-lang/rust/pull/36917
5223 [36993]: https://github.com/rust-lang/rust/pull/36993
5224 [37037]: https://github.com/rust-lang/rust/pull/37037
5225 [37064]: https://github.com/rust-lang/rust/pull/37064
5226 [37094]: https://github.com/rust-lang/rust/pull/37094
5227 [37108]: https://github.com/rust-lang/rust/pull/37108
5228 [37111]: https://github.com/rust-lang/rust/pull/37111
5229 [37161]: https://github.com/rust-lang/rust/pull/37161
5230 [37162]: https://github.com/rust-lang/rust/pull/37162
5231 [37167]: https://github.com/rust-lang/rust/pull/37167
5232 [37178]: https://github.com/rust-lang/rust/pull/37178
5233 [37200]: https://github.com/rust-lang/rust/pull/37200
5234 [37213]: https://github.com/rust-lang/rust/pull/37213
5235 [37221]: https://github.com/rust-lang/rust/pull/37221
5236 [37224]: https://github.com/rust-lang/rust/pull/37224
5237 [37230]: https://github.com/rust-lang/rust/pull/37230
5238 [37231]: https://github.com/rust-lang/rust/pull/37231
5239 [37247]: https://github.com/rust-lang/rust/pull/37247
5240 [37267]: https://github.com/rust-lang/rust/pull/37267
5241 [37270]: https://github.com/rust-lang/rust/pull/37270
5242 [37273]: https://github.com/rust-lang/rust/pull/37273
5243 [37280]: https://github.com/rust-lang/rust/pull/37280
5244 [37298]: https://github.com/rust-lang/rust/pull/37298
5245 [37306]: https://github.com/rust-lang/rust/pull/37306
5246 [37310]: https://github.com/rust-lang/rust/pull/37310
5247 [37312]: https://github.com/rust-lang/rust/pull/37312
5248 [37313]: https://github.com/rust-lang/rust/pull/37313
5249 [37315]: https://github.com/rust-lang/rust/pull/37315
5250 [37318]: https://github.com/rust-lang/rust/pull/37318
5251 [37322]: https://github.com/rust-lang/rust/pull/37322
5252 [37326]: https://github.com/rust-lang/rust/pull/37326
5253 [37351]: https://github.com/rust-lang/rust/pull/37351
5254 [37356]: https://github.com/rust-lang/rust/pull/37356
5255 [37367]: https://github.com/rust-lang/rust/pull/37367
5256 [37373]: https://github.com/rust-lang/rust/pull/37373
5257 [37378]: https://github.com/rust-lang/rust/pull/37378
5258 [37389]: https://github.com/rust-lang/rust/pull/37389
5259 [37392]: https://github.com/rust-lang/rust/pull/37392
5260 [37427]: https://github.com/rust-lang/rust/pull/37427
5261 [37439]: https://github.com/rust-lang/rust/pull/37439
5262 [37445]: https://github.com/rust-lang/rust/pull/37445
5263 [37470]: https://github.com/rust-lang/rust/pull/37470
5264 [37569]: https://github.com/rust-lang/rust/pull/37569
5265 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5266 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5267 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5268 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5269 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5270 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5271 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5274 Version 1.13.0 (2016-11-10)
5275 ===========================
5280 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5281 errors, like the `try!` macro, described in [RFC 0243].
5282 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5283 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5284 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5285 * [Fix lifetime rules for 'if' conditions][36029]
5286 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5291 * [Add the `-C link-arg` argument][36574]
5292 * [Remove the old AST-based backend from rustc_trans][35764]
5293 * [Don't enable NEON by default on armv7 Linux][35814]
5294 * [Fix debug line number info for macro expansions][35238]
5295 * [Do not emit "class method" debuginfo for types that are not
5296 DICompositeType][36008]
5297 * [Warn about multiple conflicting #[repr] hints][34623]
5298 * [When sizing DST, don't double-count nested struct prefixes][36351]
5299 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5300 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5301 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5302 * [Expand macros without recursing to avoid stack overflows][36214]
5307 * [Replace macro backtraces with labeled local uses][35702]
5308 * [Improve error message for misplaced doc comments][33922]
5309 * [Buffer unix and lock windows to prevent message interleaving][35975]
5310 * [Update lifetime errors to specifically note temporaries][36171]
5311 * [Special case a few colors for Windows][36178]
5312 * [Suggest `use self` when such an import resolves][36289]
5313 * [Be more specific when type parameter shadows primitive type][36338]
5314 * Many minor improvements
5316 Compile-time Optimizations
5317 --------------------------
5319 * [Compute and cache HIR hashes at beginning][35854]
5320 * [Don't hash types in loan paths][36004]
5321 * [Cache projections in trans][35761]
5322 * [Optimize the parser's last token handling][36527]
5323 * [Only instantiate #[inline] functions in codegen units referencing
5324 them][36524]. This leads to big improvements in cases where crates export
5325 define many inline functions without using them directly.
5326 * [Lazily allocate TypedArena's first chunk][36592]
5327 * [Don't allocate during default HashSet creation][36734]
5334 * [`overflowing_abs`]
5335 * [`RefCell::try_borrow`]
5336 * [`RefCell::try_borrow_mut`]
5341 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5342 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5344 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5345 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5346 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5347 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5348 * [Use arc4rand on FreeBSD][35884]
5349 * [memrchr: Correct aligned offset computation][35969]
5350 * [Improve Demangling of Rust Symbols][36059]
5351 * [Use monotonic time in condition variables][35048]
5352 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5353 * [Implement conversion traits for `char`][35755]
5354 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5355 * [Zero first byte of CString on drop][36264]
5356 * [Inherit overflow checks for sum and product][36372]
5357 * [Add missing Eq implementations][36423]
5358 * [Implement `Debug` for `DirEntry`][36631]
5359 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5361 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5362 * [Implement more traits for `std::io::ErrorKind`][35911]
5363 * [Optimize BinaryHeap bounds checking][36072]
5364 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5365 `extend_with_element`][36355]
5366 * [Fix overflow checking in unsigned pow()][34942]
5371 * This release includes security fixes to both curl and OpenSSL.
5372 * [Fix transitive doctests when panic=abort][cargo/3021]
5373 * [Add --all-features flag to cargo][cargo/3038]
5374 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5375 * [Don't parse the home directory more than once][cargo/3078]
5376 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5377 * [Update OpenSSL to 1.0.2j][cargo/3121]
5378 * [Add license and license_file to cargo metadata output][cargo/3110]
5379 * [Make crates-io registry URL optional in config; ignore all changes to
5380 source.crates-io][cargo/3089]
5381 * [Don't download dependencies from other platforms][cargo/3123]
5382 * [Build transitive dev-dependencies when needed][cargo/3125]
5383 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5384 * [Avoid updating registry when adding existing deps][cargo/3144]
5385 * [Warn about path overrides that won't work][cargo/3136]
5386 * [Use workspaces during `cargo install`][cargo/3146]
5387 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5388 * [Add --message-format flag][cargo/3000]
5389 * [Pass target environment for rustdoc][cargo/3205]
5390 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5391 * [Update curl and curl-sys][cargo/3241]
5392 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5397 * [rustdoc: Add the `--sysroot` argument][36586]
5398 * [rustdoc: Fix a couple of issues with the search results][35655]
5399 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5400 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5401 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5406 * [Remove unmaintained style guide][35124]
5407 * [Add s390x support][36369]
5408 * [Initial work at Haiku OS support][36727]
5409 * [Add mips-uclibc targets][35734]
5410 * [Crate-ify compiler-rt into compiler-builtins][35021]
5411 * [Add rustc version info (git hash + date) to dist tarball][36213]
5412 * Many documentation improvements
5417 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5418 * [Deny (by default) transmuting from fn item types to pointer-sized
5419 types][34923]. Continuing the long transition to zero-sized fn items,
5421 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5423 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5424 * [Fix lifetime rules for 'if' conditions][36029].
5425 * [Inherit overflow checks for sum and product][36372].
5426 * [Forbid user-defined macros named "macro_rules"][36730].
5428 [33922]: https://github.com/rust-lang/rust/pull/33922
5429 [34623]: https://github.com/rust-lang/rust/pull/34623
5430 [34923]: https://github.com/rust-lang/rust/pull/34923
5431 [34942]: https://github.com/rust-lang/rust/pull/34942
5432 [34982]: https://github.com/rust-lang/rust/pull/34982
5433 [35021]: https://github.com/rust-lang/rust/pull/35021
5434 [35048]: https://github.com/rust-lang/rust/pull/35048
5435 [35074]: https://github.com/rust-lang/rust/pull/35074
5436 [35124]: https://github.com/rust-lang/rust/pull/35124
5437 [35234]: https://github.com/rust-lang/rust/pull/35234
5438 [35238]: https://github.com/rust-lang/rust/pull/35238
5439 [35354]: https://github.com/rust-lang/rust/pull/35354
5440 [35559]: https://github.com/rust-lang/rust/pull/35559
5441 [35585]: https://github.com/rust-lang/rust/pull/35585
5442 [35627]: https://github.com/rust-lang/rust/pull/35627
5443 [35655]: https://github.com/rust-lang/rust/pull/35655
5444 [35702]: https://github.com/rust-lang/rust/pull/35702
5445 [35707]: https://github.com/rust-lang/rust/pull/35707
5446 [35728]: https://github.com/rust-lang/rust/pull/35728
5447 [35734]: https://github.com/rust-lang/rust/pull/35734
5448 [35755]: https://github.com/rust-lang/rust/pull/35755
5449 [35761]: https://github.com/rust-lang/rust/pull/35761
5450 [35764]: https://github.com/rust-lang/rust/pull/35764
5451 [35814]: https://github.com/rust-lang/rust/pull/35814
5452 [35854]: https://github.com/rust-lang/rust/pull/35854
5453 [35871]: https://github.com/rust-lang/rust/pull/35871
5454 [35884]: https://github.com/rust-lang/rust/pull/35884
5455 [35911]: https://github.com/rust-lang/rust/pull/35911
5456 [35969]: https://github.com/rust-lang/rust/pull/35969
5457 [35975]: https://github.com/rust-lang/rust/pull/35975
5458 [36004]: https://github.com/rust-lang/rust/pull/36004
5459 [36008]: https://github.com/rust-lang/rust/pull/36008
5460 [36014]: https://github.com/rust-lang/rust/pull/36014
5461 [36029]: https://github.com/rust-lang/rust/pull/36029
5462 [36059]: https://github.com/rust-lang/rust/pull/36059
5463 [36072]: https://github.com/rust-lang/rust/pull/36072
5464 [36101]: https://github.com/rust-lang/rust/pull/36101
5465 [36104]: https://github.com/rust-lang/rust/pull/36104
5466 [36171]: https://github.com/rust-lang/rust/pull/36171
5467 [36173]: https://github.com/rust-lang/rust/pull/36173
5468 [36178]: https://github.com/rust-lang/rust/pull/36178
5469 [36213]: https://github.com/rust-lang/rust/pull/36213
5470 [36214]: https://github.com/rust-lang/rust/pull/36214
5471 [36264]: https://github.com/rust-lang/rust/pull/36264
5472 [36266]: https://github.com/rust-lang/rust/pull/36266
5473 [36289]: https://github.com/rust-lang/rust/pull/36289
5474 [36338]: https://github.com/rust-lang/rust/pull/36338
5475 [36351]: https://github.com/rust-lang/rust/pull/36351
5476 [36355]: https://github.com/rust-lang/rust/pull/36355
5477 [36369]: https://github.com/rust-lang/rust/pull/36369
5478 [36372]: https://github.com/rust-lang/rust/pull/36372
5479 [36423]: https://github.com/rust-lang/rust/pull/36423
5480 [36482]: https://github.com/rust-lang/rust/pull/36482
5481 [36505]: https://github.com/rust-lang/rust/pull/36505
5482 [36524]: https://github.com/rust-lang/rust/pull/36524
5483 [36527]: https://github.com/rust-lang/rust/pull/36527
5484 [36551]: https://github.com/rust-lang/rust/pull/36551
5485 [36574]: https://github.com/rust-lang/rust/pull/36574
5486 [36586]: https://github.com/rust-lang/rust/pull/36586
5487 [36592]: https://github.com/rust-lang/rust/pull/36592
5488 [36631]: https://github.com/rust-lang/rust/pull/36631
5489 [36639]: https://github.com/rust-lang/rust/pull/36639
5490 [36721]: https://github.com/rust-lang/rust/pull/36721
5491 [36727]: https://github.com/rust-lang/rust/pull/36727
5492 [36730]: https://github.com/rust-lang/rust/pull/36730
5493 [36734]: https://github.com/rust-lang/rust/pull/36734
5494 [36754]: https://github.com/rust-lang/rust/pull/36754
5495 [36995]: https://github.com/rust-lang/rust/pull/36995
5496 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5497 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5498 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5499 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5500 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5501 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5502 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5503 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5504 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5505 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5506 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5507 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5508 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5509 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5510 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5511 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5512 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5513 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5514 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5515 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5516 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5517 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5518 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5519 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5520 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5521 [rustup]: https://www.rustup.rs
5522 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5523 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5524 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5525 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5526 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5527 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5528 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5531 Version 1.12.1 (2016-10-20)
5532 ===========================
5537 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5538 * [Confusion with double negation and booleans][36856]
5539 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5540 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5541 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5542 * [Corrupted memory after updated to 1.12][36936]
5543 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5544 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5545 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5547 [36381]: https://github.com/rust-lang/rust/issues/36381
5548 [36856]: https://github.com/rust-lang/rust/issues/36856
5549 [36875]: https://github.com/rust-lang/rust/issues/36875
5550 [36924]: https://github.com/rust-lang/rust/issues/36924
5551 [36926]: https://github.com/rust-lang/rust/issues/36926
5552 [36936]: https://github.com/rust-lang/rust/issues/36936
5553 [37026]: https://github.com/rust-lang/rust/issues/37026
5554 [37112]: https://github.com/rust-lang/rust/issues/37112
5555 [37153]: https://github.com/rust-lang/rust/issues/37153
5558 Version 1.12.0 (2016-09-29)
5559 ===========================
5564 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5565 This translation pass is far simpler than the previous AST->LLVM pass, and
5566 creates opportunities to perform new optimizations directly on the MIR. It
5567 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5568 * [`rustc` presents a new, more readable error format, along with
5569 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5570 Most common editors supporting Rust have been updated to work with it. It was
5571 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5576 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5577 This translation pass is far simpler than the previous AST->LLVM pass, and
5578 creates opportunities to perform new optimizations directly on the MIR. It
5579 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5580 * [Print the Rust target name, not the LLVM target name, with
5581 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5582 * [The computation of `TypeId` is correct in some cases where it was previously
5583 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5584 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5585 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5586 `--print relocation-models`, and `--print code-models` print the available
5587 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5588 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5589 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5590 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5591 These targets produce statically-linked binaries. There are no binary release
5597 * [`rustc` presents a new, more readable error format, along with
5598 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5599 Most common editors supporting Rust have been updated to work with it. It was
5600 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5601 * [In error descriptions, references are now described in plain English,
5602 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5603 * [In error type descriptions, unknown numeric types are named `{integer}` or
5604 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5605 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5610 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5611 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5612 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5613 useful](https://github.com/rust-lang/rust/pull/34908)
5614 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5615 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5616 * [Semicolons are properly required as statement delimiters inside
5617 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5618 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5623 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5624 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5625 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5626 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5627 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5628 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5629 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5630 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5631 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5632 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5633 Both on Unix and Windows.
5634 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5635 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5636 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5637 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5638 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5639 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5640 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5641 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5646 * [The `format!` macro and friends now allow a single argument to be formatted
5647 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5648 * [The lifetime bounds on `[T]::binary_search_by` and
5649 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5650 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5651 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5652 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5653 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5654 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5655 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5656 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5657 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5658 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5659 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5660 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5661 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5662 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5663 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5664 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5665 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5666 * [`mpsc::sync_channel` `Receiver`s return any available message before
5667 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5668 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5669 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5674 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5675 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5676 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5677 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5678 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5679 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5680 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5681 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5682 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5683 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5684 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5685 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5686 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5687 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5688 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5689 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5694 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5695 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5700 * [Test binaries now support a `--test-threads` argument to specify the number
5701 of threads used to run tests, and which acts the same as the
5702 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5703 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5704 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5705 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5706 * [Rust releases now come with source packages that can be installed by rustup
5707 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5708 The resulting source code can be used by tools and IDES, located in the
5709 sysroot under `lib/rustlib/src`.
5714 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5715 * Many minor improvements to the documentation.
5716 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5721 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5722 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5723 * [When formatting strings, if "precision" is specified, the "fill",
5724 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5725 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5728 Version 1.11.0 (2016-08-18)
5729 ===========================
5734 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5735 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5736 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5737 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5742 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5743 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5744 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5745 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5746 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5747 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5748 (in libcore - previously stabilized in libstd)
5749 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5750 (in libcore - previously stabilized in libstd)
5751 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5752 (in libcore - previously stabilized in libstd)
5753 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5754 (in libcore - previously stabilized in libstd)
5755 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5756 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5757 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5758 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5763 * [The `thread_local!` macro supports multiple definitions in a single
5764 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5765 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5766 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5767 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5768 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5769 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5770 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5771 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5776 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5777 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5778 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5779 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5780 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5781 and `-vv` prints warnings for all crates.
5782 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5783 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5784 This provides room for expansion by arbitrary tools.
5785 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5786 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5787 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5788 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5789 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5790 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5791 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5796 * [Caching projections speeds up type check dramatically for some
5797 workloads](https://github.com/rust-lang/rust/pull/33816)
5798 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5799 This hasher is faster, but is believed to provide sufficient
5800 protection from collision attacks.
5801 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5806 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5807 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5808 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5809 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5810 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5815 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5816 * [When emitting debug info, rustc emits frame pointers for closures,
5817 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5818 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5819 * Many more errors have been given error codes and extended
5821 * API documentation continues to be improved, with many new examples
5826 * [rustc no longer hangs when dependencies recursively re-export
5827 submodules](https://github.com/rust-lang/rust/pull/34542)
5828 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5829 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5830 rewritten](https://github.com/rust-lang/rust/pull/33895)
5831 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5832 No targets use this yet, but it works toward AVR support.
5837 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5838 * [The new follow-set rules that place restrictions on `macro_rules!`
5839 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5840 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5841 and has been a warning since 1.10.
5842 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5843 This causes breakage in some corner cases.
5846 Version 1.10.0 (2016-07-07)
5847 ===========================
5852 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5853 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5854 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5855 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5856 * [`panic!` can be converted to a runtime abort with the
5857 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5858 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5859 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5860 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5861 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5862 Note that Cargo does not yet directly support cdylibs.
5867 * `os::windows::fs::OpenOptionsExt::access_mode`
5868 * `os::windows::fs::OpenOptionsExt::share_mode`
5869 * `os::windows::fs::OpenOptionsExt::custom_flags`
5870 * `os::windows::fs::OpenOptionsExt::attributes`
5871 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5872 * `os::unix::fs::OpenOptionsExt::custom_flags`
5873 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5874 * `Default for sync::Weak`
5875 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5876 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5877 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5878 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5879 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5880 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5881 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5882 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5883 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5884 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5885 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5886 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5887 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5888 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5889 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5890 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5891 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5892 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5893 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5894 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5895 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5896 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5897 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5898 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5899 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5900 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5901 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5902 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5903 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5904 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5905 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5906 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5907 * Read/Write/RawFd impls for `UnixStream`
5908 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5909 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5910 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5911 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5912 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5913 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5914 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5915 * RawFd impls for `UnixListener`
5916 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5917 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5918 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5919 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5920 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5921 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5922 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5923 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5924 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5925 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5926 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5927 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5928 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5929 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5930 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5931 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5932 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5933 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5934 * RawFd impls for `UnixDatagram`
5935 * `{BTree,Hash}Map::values_mut`
5936 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5941 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5942 The semantics of this minor method are subtle and probably not what
5944 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5945 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5946 will fall back to `/dev/urandom` temporarily to avoid blocking
5947 during early boot](https://github.com/rust-lang/rust/pull/33086).
5948 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5949 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5950 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5951 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5952 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5953 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5954 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5958 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5959 This controls the runtime behavior of the `panic!` macro
5960 and can be either "unwind" (the default), or "abort".
5961 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5962 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5963 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5964 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5965 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5966 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5967 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5968 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5969 By default they are retried twice, which can be customized with the
5970 `net.retry` value in `.cargo/config`.
5971 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5972 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5973 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5974 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5975 Makes it possible to install multiple crates in parallel.
5976 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5977 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5978 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5979 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5980 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5981 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5986 * [rustc memory usage was reduced by refactoring the context used for
5987 type checking](https://github.com/rust-lang/rust/pull/33425).
5988 * [Speed up creation of `HashMap`s by caching the random keys used
5989 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5990 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5991 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5992 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5993 10x faster than the previous lookup tables.
5994 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5999 * Many incremental improvements to documentation and rustdoc.
6000 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6001 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6002 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6003 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6004 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6005 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6006 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6011 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6012 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6013 * [`std` no longer prints backtraces on platforms where the running
6014 module must be loaded with `env::current_exe`, which can't be relied
6015 on](https://github.com/rust-lang/rust/pull/33554).
6016 * This release includes std binaries for the i586-unknown-linux-gnu,
6017 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6018 i586 target is for old x86 hardware without SSE2, and the armv7
6019 target is for Android running on modern ARM architectures.
6020 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6021 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6022 * [On Unix the runtime aborts by calling `libc::abort` instead of
6023 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6024 * [Rust is now bootstrapped from the previous release of Rust,
6025 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6030 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6031 * [`target_env` for Linux ARM targets is just `gnu`, not
6032 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6033 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6034 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6035 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6036 Affects how macros are parsed.
6037 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6038 * [Feature-gated attributes on macro-generated macro invocations are
6039 now rejected](https://github.com/rust-lang/rust/pull/32791).
6040 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6041 This caused some minor changes to type inference.
6044 Version 1.9.0 (2016-05-26)
6045 ==========================
6050 * The `#[deprecated]` attribute when applied to an API will generate
6051 warnings when used. The warnings may be suppressed with
6052 `#[allow(deprecated)]`. [RFC 1270].
6053 * [`fn` item types are zero sized, and each `fn` names a unique
6054 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6055 `transmute` on a `fn` type will generate a warning for a few cycles,
6056 then will be converted to an error.
6057 * [Field and method resolution understand visibility, so private
6058 fields and methods cannot prevent the proper use of public fields
6059 and methods][1.9fv].
6060 * [The parser considers unicode codepoints in the
6061 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6067 * [`std::panic::catch_unwind`] (renamed from `recover`)
6068 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6069 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6070 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6071 * [`str::is_char_boundary`]
6072 * [`<*const T>::as_ref`]
6073 * [`<*mut T>::as_ref`]
6074 * [`<*mut T>::as_mut`]
6075 * [`AsciiExt::make_ascii_uppercase`]
6076 * [`AsciiExt::make_ascii_lowercase`]
6077 * [`char::decode_utf16`]
6078 * [`char::DecodeUtf16`]
6079 * [`char::DecodeUtf16Error`]
6080 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6081 * [`BTreeSet::take`]
6082 * [`BTreeSet::replace`]
6085 * [`HashSet::replace`]
6087 * [`OsString::with_capacity`]
6088 * [`OsString::clear`]
6089 * [`OsString::capacity`]
6090 * [`OsString::reserve`]
6091 * [`OsString::reserve_exact`]
6092 * [`OsStr::is_empty`]
6094 * [`std::os::unix::thread`]
6097 * [`JoinHandleExt::as_pthread_t`]
6098 * [`JoinHandleExt::into_pthread_t`]
6099 * [`HashSet::hasher`]
6100 * [`HashMap::hasher`]
6101 * [`CommandExt::exec`]
6102 * [`File::try_clone`]
6103 * [`SocketAddr::set_ip`]
6104 * [`SocketAddr::set_port`]
6105 * [`SocketAddrV4::set_ip`]
6106 * [`SocketAddrV4::set_port`]
6107 * [`SocketAddrV6::set_ip`]
6108 * [`SocketAddrV6::set_port`]
6109 * [`SocketAddrV6::set_flowinfo`]
6110 * [`SocketAddrV6::set_scope_id`]
6111 * [`slice::copy_from_slice`]
6112 * [`ptr::read_volatile`]
6113 * [`ptr::write_volatile`]
6114 * [`OpenOptions::create_new`]
6115 * [`TcpStream::set_nodelay`]
6116 * [`TcpStream::nodelay`]
6117 * [`TcpStream::set_ttl`]
6118 * [`TcpStream::ttl`]
6119 * [`TcpStream::set_only_v6`]
6120 * [`TcpStream::only_v6`]
6121 * [`TcpStream::take_error`]
6122 * [`TcpStream::set_nonblocking`]
6123 * [`TcpListener::set_ttl`]
6124 * [`TcpListener::ttl`]
6125 * [`TcpListener::set_only_v6`]
6126 * [`TcpListener::only_v6`]
6127 * [`TcpListener::take_error`]
6128 * [`TcpListener::set_nonblocking`]
6129 * [`UdpSocket::set_broadcast`]
6130 * [`UdpSocket::broadcast`]
6131 * [`UdpSocket::set_multicast_loop_v4`]
6132 * [`UdpSocket::multicast_loop_v4`]
6133 * [`UdpSocket::set_multicast_ttl_v4`]
6134 * [`UdpSocket::multicast_ttl_v4`]
6135 * [`UdpSocket::set_multicast_loop_v6`]
6136 * [`UdpSocket::multicast_loop_v6`]
6137 * [`UdpSocket::set_multicast_ttl_v6`]
6138 * [`UdpSocket::multicast_ttl_v6`]
6139 * [`UdpSocket::set_ttl`]
6140 * [`UdpSocket::ttl`]
6141 * [`UdpSocket::set_only_v6`]
6142 * [`UdpSocket::only_v6`]
6143 * [`UdpSocket::join_multicast_v4`]
6144 * [`UdpSocket::join_multicast_v6`]
6145 * [`UdpSocket::leave_multicast_v4`]
6146 * [`UdpSocket::leave_multicast_v6`]
6147 * [`UdpSocket::take_error`]
6148 * [`UdpSocket::connect`]
6149 * [`UdpSocket::send`]
6150 * [`UdpSocket::recv`]
6151 * [`UdpSocket::set_nonblocking`]
6156 * [`std::sync::Once` is poisoned if its initialization function
6158 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6159 * [Most types implement `fmt::Debug`][1.9db].
6160 * [The default buffer size used by `BufReader` and `BufWriter` was
6161 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6162 used by other languages.
6163 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6164 `Duration` additionally implements `*=` and `/=`][1.9ta].
6165 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6166 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6167 * [`Chain` implements `BufRead`][1.9ch].
6168 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6173 * [Cargo can now run concurrently][1.9cc].
6174 * [Top-level overrides allow specific revisions of crates to be
6175 overridden through the entire crate graph][1.9ct]. This is intended
6176 to make upgrades easier for large projects, by allowing crates to be
6177 forked temporarily until they've been upgraded and republished.
6178 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6179 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6180 on the commandline][1.9cf]. `rustc` arguments can also be specified
6181 in the `build.rustflags` configuration key.
6186 * [The time complexity of comparing variables for equivalence during type
6187 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6188 to major compilation time improvement in some scenarios.
6189 * [`ToString` is specialized for `str`, giving it the same performance
6190 as `to_owned`][1.9ts].
6191 * [Spawning processes with `Command::output` no longer creates extra
6193 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6194 for C-like enums][1.9cl].
6199 * [Passing the `--quiet` flag to a test runner will produce
6200 much-abbreviated output][1.9q].
6201 * The Rust Project now publishes std binaries for the
6202 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6203 `i586-pc-windows-msvc` targets.
6208 * [`std::sync::Once` is poisoned if its initialization function
6210 * [It is illegal to define methods with the same name in overlapping
6211 inherent `impl` blocks][1.9sn].
6212 * [`fn` item types are zero sized, and each `fn` names a unique
6213 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6214 `transmute` on a `fn` type will generate a warning for a few cycles,
6215 then will be converted to an error.
6216 * [Improvements to const evaluation may trigger new errors when integer
6217 literals are out of range][1.9ce].
6220 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6221 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6222 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6223 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6224 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6225 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6226 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6227 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6228 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6229 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6230 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6231 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6232 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6233 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6234 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6235 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6236 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6237 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6238 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6239 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6240 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6241 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6242 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6243 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6244 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6245 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6246 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6247 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6248 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6249 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6250 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6251 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6252 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6253 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6254 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6255 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6256 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6257 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6258 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6259 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6260 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6261 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6262 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6263 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6264 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6265 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6266 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6267 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6268 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6269 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6270 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6271 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6272 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6273 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6274 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6275 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6276 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6277 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6278 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6279 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6280 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6281 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6282 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6283 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6284 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6285 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6286 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6287 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6288 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6289 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6290 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6291 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6292 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6293 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6294 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6295 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6296 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6297 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6298 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6299 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6300 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6301 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6302 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6303 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6304 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6305 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6306 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6307 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6308 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6309 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6310 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6311 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6312 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6313 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6314 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6315 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6316 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6317 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6318 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6319 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6320 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6321 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6322 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6323 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6324 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6325 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6326 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6327 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6328 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6329 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6332 Version 1.8.0 (2016-04-14)
6333 ==========================
6338 * Rust supports overloading of compound assignment statements like
6339 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6340 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6341 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6343 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6344 addition to the non-braced form, `struct Foo;`. [RFC 218].
6350 * [`str::encode_utf16`] (renamed from `utf16_units`)
6351 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6354 * [`ptr::drop_in_place`]
6356 * [`time::SystemTime`]
6358 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6359 * [`Instant::elapsed`]
6360 * [`SystemTime::now`]
6361 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6362 * [`SystemTime::elapsed`]
6363 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6364 * [`SystemTimeError`]
6365 * [`SystemTimeError::duration`]
6366 * Various impls for `SystemTimeError`
6368 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6369 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6370 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6371 * [The `write!` and `writeln!` macros correctly emit errors if any of
6372 their arguments can't be formatted][1.8w].
6373 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6374 * [The Unix-specific `raw` modules, which contain a number of
6375 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6376 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6377 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6378 across platforms was making it difficult to implement `std`
6379 correctly. Those that need these definitions should use the `libc`
6381 * The Unix-specific `MetadataExt` traits, including
6382 `os::unix::fs::MetadataExt`, which expose values such as inode
6383 numbers [no longer return platform-specific types][1.8r], but
6384 instead return widened integers. [RFC 1415].
6385 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6386 * [Atomic loads and stores are not volatile][1.8a].
6387 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6392 * [Inlining hash functions lead to a 3% compile-time improvement in
6393 some workloads][1.8h].
6394 * When using jemalloc, its symbols are [unprefixed so that it
6395 overrides the libc malloc implementation][1.8h]. This means that for
6396 rustc, LLVM is now using jemalloc, which results in a 6%
6397 compile-time improvement on a specific workload.
6398 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6403 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6404 i686-pc-windows-msvc is now considered a tier-1 platform.
6405 * [The `--print targets` flag prints a list of supported targets][1.8t].
6406 * [The `--print cfg` flag prints the `cfg`s defined for the current
6408 * [`rustc` can be built with an new Cargo-based build system, written
6409 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6410 build system. To enable it configure with `configure --rustbuild`.
6411 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6412 variants while also indicating the total number of missing variants
6413 if more than 3][1.8m].
6414 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6415 * The Rust Project now publishes binary releases of the standard
6416 library for a number of tier-2 targets:
6417 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6418 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6419 `x86_64-rumprun-netbsd`. These can be installed with
6420 tools such as [multirust][1.8mr].
6425 * [`cargo init` creates a new Cargo project in the current
6426 directory][1.8ci]. It is otherwise like `cargo new`.
6427 * [Cargo has configuration keys for `-v` and
6428 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6429 `[term]` section of `.cargo/config`.
6430 * [Configuration keys that evaluate to strings or integers can be set
6431 via environment variables][1.8ce]. For example the `build.jobs` key
6432 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6433 precedence over config files.
6434 * [Target-specific dependencies support Rust `cfg` syntax for
6435 describing targets][1.8cfg] so that dependencies for multiple
6436 targets can be specified together. [RFC 1361].
6437 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6438 `RUSTDOC` take precedence over the `build.target-dir`,
6439 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6440 * [The child process tree is killed on Windows when Cargo is
6442 * [The `build.target` configuration value sets the target platform,
6443 like `--target`][1.8ct].
6448 * [Unstable compiler flags have been further restricted][1.8u]. Since
6449 1.0 `-Z` flags have been considered unstable, and other flags that
6450 were considered unstable additionally required passing `-Z
6451 unstable-options` to access. Unlike unstable language and library
6452 features though, these options have been accessible on the stable
6453 release channel. Going forward, *new unstable flags will not be
6454 available on the stable release channel*, and old unstable flags
6455 will warn about their usage. In the future, all unstable flags will
6456 be unavailable on the stable release channel.
6457 * [It is no longer possible to `match` on empty enum variants using
6458 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6459 * The Unix-specific `MetadataExt` traits, including
6460 `os::unix::fs::MetadataExt`, which expose values such as inode
6461 numbers [no longer return platform-specific types][1.8r], but
6462 instead return widened integers. [RFC 1415].
6463 * [Modules sourced from the filesystem cannot appear within arbitrary
6464 blocks, but only within other modules][1.8mf].
6465 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6466 * On Unix, [stack overflow triggers a runtime abort instead of a
6468 * [`Command::spawn` and its equivalents return an error if any of
6469 its command-line arguments contain interior `NUL`s][1.8n].
6470 * [Tuple and unit enum variants from other crates are in the type
6472 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6473 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6474 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6475 instead of `foo.lib`.
6478 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6479 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6480 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6481 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6482 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6483 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6484 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6485 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6486 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6487 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6488 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6489 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6490 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6491 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6492 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6493 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6494 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6495 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6496 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6497 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6498 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6499 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6500 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6501 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6502 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6503 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6504 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6505 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6506 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6507 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6508 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6509 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6510 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6511 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6512 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6513 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6514 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6515 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6516 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6517 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6518 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6519 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6520 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6521 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6522 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6523 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6524 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6525 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6526 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6527 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6528 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6529 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6530 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6531 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6532 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6533 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6534 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6535 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6536 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6537 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6540 Version 1.7.0 (2016-03-03)
6541 ==========================
6548 * [`Path::strip_prefix`] (renamed from relative_from)
6549 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6551 * [`Ipv4Addr::is_loopback`]
6552 * [`Ipv4Addr::is_private`]
6553 * [`Ipv4Addr::is_link_local`]
6554 * [`Ipv4Addr::is_multicast`]
6555 * [`Ipv4Addr::is_broadcast`]
6556 * [`Ipv4Addr::is_documentation`]
6558 * [`Ipv6Addr::is_unspecified`]
6559 * [`Ipv6Addr::is_loopback`]
6560 * [`Ipv6Addr::is_multicast`]
6563 * [`Vec::as_mut_slice`]
6565 * [`String::as_str`]
6566 * [`String::as_mut_str`]
6568 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6570 * `<[T]>::`[`sort_by_key`]
6571 * checked, saturated, and overflowing operations
6572 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6573 * [`i32::saturating_mul`]
6574 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6575 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6576 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6577 * [`u32::saturating_mul`]
6578 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6579 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6580 * and checked, saturated, and overflowing operations for other primitive types
6582 * [`ffi::IntoStringError`]
6583 * [`CString::into_string`]
6584 * [`CString::into_bytes`]
6585 * [`CString::into_bytes_with_nul`]
6586 * `From<CString> for Vec<u8>`
6588 * [`IntoStringError::into_cstring`]
6589 * [`IntoStringError::utf8_error`]
6590 * `Error for IntoStringError`
6592 * [`std::hash::BuildHasher`]
6593 * [`BuildHasher::Hasher`]
6594 * [`BuildHasher::build_hasher`]
6595 * [`std::hash::BuildHasherDefault`]
6596 * [`HashMap::with_hasher`]
6597 * [`HashMap::with_capacity_and_hasher`]
6598 * [`HashSet::with_hasher`]
6599 * [`HashSet::with_capacity_and_hasher`]
6600 * [`std::collections::hash_map::RandomState`]
6601 * [`RandomState::new`]
6602 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6603 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6604 from bytes is faster.
6605 * [The performance of `LineWriter` (and thus `io::stdout`) was
6606 improved by using `memchr` to search for newlines][1.7m].
6607 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6608 `f64` variants were stabilized previously.
6609 * [`BTreeMap` was rewritten to use less memory and improve the performance
6610 of insertion and iteration, the latter by as much as 5x][1.7bm].
6611 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6612 covariant over their contained type][1.7bt].
6613 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6614 over their contained type][1.7ll].
6615 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6617 * [`Any` is implemented for unsized types][1.7a].
6618 * [`Hash` is implemented for `Duration`][1.7h].
6623 * [When running tests with `--test`, rustdoc will pass `--cfg`
6624 arguments to the compiler][1.7dt].
6625 * [The compiler is built with RPATH information by default][1.7rpa].
6626 This means that it will be possible to run `rustc` when installed in
6627 unusual configurations without configuring the dynamic linker search
6629 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6630 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6631 over `LD_LIBRARY_PATH`.
6636 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6637 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6638 * [The `rerun-if-changed` build script directive no longer causes the
6639 build script to incorrectly run twice in certain scenarios][1.7rr].
6644 * Soundness fixes to the interactions between associated types and
6645 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6646 code that violates the new rules. This is a significant change that
6647 is known to break existing code, so it has emitted warnings for the
6648 new error cases since 1.4 to give crate authors time to adapt. The
6649 details of what is changing are subtle; read the RFC for more.
6650 * [Several bugs in the compiler's visibility calculations were
6651 fixed][1.7v]. Since this was found to break significant amounts of
6652 code, the new errors will be emitted as warnings for several release
6653 cycles, under the `private_in_public` lint.
6654 * Defaulted type parameters were accidentally accepted in positions
6655 that were not intended. In this release, [defaulted type parameters
6656 appearing outside of type definitions will generate a
6657 warning][1.7d], which will become an error in future releases.
6658 * [Parsing "." as a float results in an error instead of 0][1.7p].
6659 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6660 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6662 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6663 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6664 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6665 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6666 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6667 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6668 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6669 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6670 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6671 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6672 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6673 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6674 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6675 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6676 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6677 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6678 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6679 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6680 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6681 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6682 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6683 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6684 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6685 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6686 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6687 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6688 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6689 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6690 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6691 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6692 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6693 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6694 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6695 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6696 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6697 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6698 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6699 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6700 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6701 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6702 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6703 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6704 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6705 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6706 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6707 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6708 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6709 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6710 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6711 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6712 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6713 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6714 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6715 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6716 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6717 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6718 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6719 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6720 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6721 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6722 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6723 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6724 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6725 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6726 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6727 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6728 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6729 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6730 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6731 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6732 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6733 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6734 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6735 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6736 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6737 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6738 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6739 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6740 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6743 Version 1.6.0 (2016-01-21)
6744 ==========================
6749 * The `#![no_std]` attribute causes a crate to not be linked to the
6750 standard library, but only the [core library][1.6co], as described
6751 in [RFC 1184]. The core library defines common types and traits but
6752 has no platform dependencies whatsoever, and is the basis for Rust
6753 software in environments that cannot support a full port of the
6754 standard library, such as operating systems. Most of the core
6755 library is now stable.
6761 [`Read::read_exact`],
6762 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6763 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6764 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6765 [`os::unix::fs::DirBuilderExt`],
6766 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6767 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6768 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6769 [`collections::hash_map::Drain`],
6770 [`collections::hash_map::HashMap::drain`],
6771 [`collections::hash_set::Drain`],
6772 [`collections::hash_set::HashSet::drain`],
6773 [`collections::binary_heap::Drain`],
6774 [`collections::binary_heap::BinaryHeap::drain`],
6775 [`Vec::extend_from_slice`] (renamed from `push_all`),
6776 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6777 [`RwLock::into_inner`],
6778 [`Iterator::min_by_key`] (renamed from `min_by`),
6779 [`Iterator::max_by_key`] (renamed from `max_by`).
6780 * The [core library][1.6co] is stable, as are most of its APIs.
6781 * [The `assert_eq!` macro supports arguments that don't implement
6782 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6784 * Several timer functions that take duration in milliseconds [are
6785 deprecated in favor of those that take `Duration`][1.6ms]. These
6786 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6787 `thread::park_timeout_ms`.
6788 * The algorithm by which `Vec` reserves additional elements was
6789 [tweaked to not allocate excessive space][1.6a] while still growing
6791 * `From` conversions are [implemented from integers to floats][1.6f]
6792 in cases where the conversion is lossless. Thus they are not
6793 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6794 or `f64`. They are also not implemented for `isize` and `usize`
6795 because the implementations would be platform-specific. `From` is
6796 also implemented from `f32` to `f64`.
6797 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6798 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6799 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6800 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6802 * Sorting slices that are already sorted [is 50% faster in some
6808 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6809 * Cargo build scripts can specify their dependencies by emitting the
6810 [`rerun-if-changed`][1.6rr] key.
6811 * crates.io will reject publication of crates with dependencies that
6812 have a wildcard version constraint. Crates with wildcard
6813 dependencies were seen to cause a variety of problems, as described
6814 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6816 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6817 release folder. A variety of artifacts that Cargo failed to clean
6818 are now correctly deleted.
6823 * The `unreachable_code` lint [warns when a function call's argument
6825 * The parser indicates [failures that may be caused by
6826 confusingly-similar Unicode characters][1.6uc]
6827 * Certain macro errors [are reported at definition time][1.6m], not
6833 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6834 environment variable when locating crates. This was a pre-cargo
6835 feature for integrating with the package manager that was
6836 accidentally never removed.
6837 * [A number of bugs were fixed in the privacy checker][1.6p] that
6838 could cause previously-accepted code to break.
6839 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6840 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6841 struct pattern syntax (`Foo(..)`) can no longer be used to match
6842 unit structs. This is a warning now, but will become an error in
6843 future releases. Patterns that share the same name as a const are
6845 * A bug was fixed that causes [rustc not to apply default type
6846 parameters][1.6xc] when resolving certain method implementations of
6847 traits defined in other crates.
6849 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6850 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6851 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6852 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6853 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6854 [1.6co]: http://doc.rust-lang.org/core/index.html
6855 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6856 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6857 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6858 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6859 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6860 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6861 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6862 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6863 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6864 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6865 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6866 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6867 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6868 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6869 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6870 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6871 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6872 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6873 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6874 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6875 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6876 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6877 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6878 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6879 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6880 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6881 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6882 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6883 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6884 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6885 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6886 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6887 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6888 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6889 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6890 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6891 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6892 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6893 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6894 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6895 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6898 Version 1.5.0 (2015-12-10)
6899 ==========================
6901 * ~700 changes, numerous bugfixes
6907 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6908 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6909 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6910 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6911 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6912 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6913 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6914 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6915 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6916 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6917 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6918 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6919 [`Path::read_link`], [`Path::symlink_metadata`],
6920 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6921 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6922 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6923 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6924 [`slice::split_first_mut`], [`slice::split_first`],
6925 [`slice::split_last_mut`], [`slice::split_last`],
6926 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6927 [`str::MatchIndices`], [`str::RMatchIndices`],
6928 [`str::match_indices`], [`str::rmatch_indices`],
6929 [`str::slice_mut_unchecked`], [`string::ParseError`].
6930 * Rust applications hosted on crates.io can be installed locally to
6931 `~/.cargo/bin` with the [`cargo install`] command. Among other
6932 things this makes it easier to augment Cargo with new subcommands:
6933 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6934 invoked as `cargo foo`.
6935 * Crates with wildcard (`*`) dependencies will [emit warnings when
6936 published][1.5w]. In 1.6 it will no longer be possible to publish
6937 crates with wildcard dependencies.
6942 * The rules determining when a particular lifetime must outlive
6943 a particular value (known as '[dropck]') have been [modified
6944 to not rely on parametricity][1.5p].
6945 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6946 and `Arc`][1.5a]. Because these smart pointer types implement
6947 `Deref`, this causes breakage in cases where the interior type
6948 contains methods of the same name.
6949 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6950 that they could drop their content. Soundness fix.
6951 * All method invocations are [properly checked][1.5wf1] for
6952 [well-formedness][1.5wf2]. Soundness fix.
6953 * Traits whose supertraits contain `Self` are [not object
6954 safe][1.5o]. Soundness fix.
6955 * Target specifications support a [`no_default_libraries`][1.5nd]
6956 setting that controls whether `-nodefaultlibs` is passed to the
6957 linker, and in turn the `is_like_windows` setting no longer affects
6958 the `-nodefaultlibs` flag.
6959 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6960 * The `#[inline]` and `#[repr]` attributes [can only appear
6961 in valid locations][1.5at].
6962 * Native libraries linked from the local crate are [passed to
6963 the linker before native libraries from upstream crates][1.5nl].
6964 * Two rarely-used attributes, `#[no_debug]` and
6965 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6966 * Negation of unsigned integers, which has been a warning for
6967 several releases, [is now behind a feature gate and will
6968 generate errors][1.5nu].
6969 * The parser accidentally accepted visibility modifiers on
6970 enum variants, a bug [which has been fixed][1.5ev].
6971 * [A bug was fixed that allowed `use` statements to import unstable
6977 * When evaluating expressions at compile-time that are not
6978 compile-time constants (const-evaluating expressions in non-const
6979 contexts), incorrect code such as overlong bitshifts and arithmetic
6980 overflow will [generate a warning instead of an error][1.5ce],
6981 delaying the error until runtime. This will allow the
6982 const-evaluator to be expanded in the future backwards-compatibly.
6983 * The `improper_ctypes` lint [no longer warns about using `isize` and
6984 `usize` in FFI][1.5ict].
6989 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6991 * `Default` is [implemented for mutable slices][1.5d].
6992 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6993 * There are now `From` conversions [between floating point
6994 types][1.5f] where the conversions are lossless.
6995 * There are now `From` conversions [between integer types][1.5i] where
6996 the conversions are lossless.
6997 * [`fs::Metadata` implements `Clone`][1.5fs].
6998 * The `parse` method [accepts a leading "+" when parsing
7000 * [`AsMut` is implemented for `Vec`][1.5am].
7001 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7002 been optimized][1.5cf] and no longer rely on the default impl.
7003 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7004 `unsafe extern "C"` function types now [implement `Clone`,
7005 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7006 `fmt::Debug` for up to 12 arguments][1.5fp].
7007 * [Dropping `Vec`s is much faster in unoptimized builds when the
7008 element types don't implement `Drop`][1.5dv].
7009 * A bug that caused in incorrect behavior when [combining `VecDeque`
7010 with zero-sized types][1.5vdz] was resolved.
7011 * [`PartialOrd` for slices is faster][1.5po].
7016 * [Crate metadata size was reduced by 20%][1.5md].
7017 * [Improvements to code generation reduced the size of libcore by 3.3
7018 MB and rustc's memory usage by 18MB][1.5m].
7019 * [Improvements to deref translation increased performance in
7020 unoptimized builds][1.5dr].
7021 * Various errors in trait resolution [are deduplicated to only be
7022 reported once][1.5te].
7023 * Rust has preliminary [support for rumprun kernels][1.5rr].
7024 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7026 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7027 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7028 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7029 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7030 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7031 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7032 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7033 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7034 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7035 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7036 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7037 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7038 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7039 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7040 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7041 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7042 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7043 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7044 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7045 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7046 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7047 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7048 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7049 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7050 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7051 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7052 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7053 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7054 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7055 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7056 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7057 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7058 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7059 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7060 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7061 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7062 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7063 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7064 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7065 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7066 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7067 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7068 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7069 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7070 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7071 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7072 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7073 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7074 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7075 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7076 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7077 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7078 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7079 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7080 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7081 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7082 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7083 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7084 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7085 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7086 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7087 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7088 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7089 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7090 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7091 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7092 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7093 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7094 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7095 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7096 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7097 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7098 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7099 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7100 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7101 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7102 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7103 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7104 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7105 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7106 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7107 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7108 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7109 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7110 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7111 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7112 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7113 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7114 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7116 Version 1.4.0 (2015-10-29)
7117 ==========================
7119 * ~1200 changes, numerous bugfixes
7124 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7125 GNU) are now supported and recommended for use.
7130 * [Several changes have been made to fix type soundness and improve
7131 the behavior of associated types][sound]. See [RFC 1214]. Although
7132 we have mostly introduced these changes as warnings this release, to
7133 become errors next release, there are still some scenarios that will
7134 see immediate breakage.
7135 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7136 line breaks in addition to `\n`][crlf].
7137 * [Loans of `'static` lifetime extend to the end of a function][stat].
7138 * [`str::parse` no longer introduces avoidable rounding error when
7139 parsing floating point numbers. Together with earlier changes to
7140 float formatting/output, "round trips" like f.to_string().parse()
7141 now preserve the value of f exactly. Additionally, leading plus
7142 signs are now accepted][fp3].
7148 * `use` statements that import multiple items [can now rename
7149 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7150 * [Binops work correctly on fat pointers][binfat].
7151 * `pub extern crate`, which does not behave as expected, [issues a
7152 warning][pec] until a better solution is found.
7157 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7158 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7159 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7160 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7161 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7162 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7163 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7164 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7165 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7166 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7167 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7168 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7169 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7170 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7171 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7172 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7173 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7174 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7176 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7177 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7178 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7179 `f64::from_str_radix`.
7180 * [Reverse-searching strings is faster with the 'two-way'
7182 * [`std::io::copy` allows `?Sized` arguments][cc].
7183 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7184 [override `count`, `nth` and `last` with an O(1)
7185 implementation][it].
7186 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7187 * [`IntoRawFd` has been added to the Unix-specific prelude,
7188 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7190 * [`Extend<String>` and `FromIterator<String` are both implemented for
7192 * [`IntoIterator` is implemented for references to `Option` and
7194 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7195 Copy`][ext] as part of [RFC 839]. This will cause type inference
7196 breakage in rare situations.
7197 * [`BinaryHeap` implements `Debug`][bh2].
7198 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7200 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7201 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7202 * [String comparison is faster][faststr].
7203 * `&mut T` where `T: std::fmt::Write` [also implements
7204 `std::fmt::Write`][mutw].
7205 * [A stable regression in `VecDeque::push_back` and other
7206 capacity-altering methods that caused panics for zero-sized types
7208 * [Function pointers implement traits for up to 12 parameters][fp2].
7213 * The compiler [no longer uses the 'morestack' feature to prevent
7214 stack overflow][mm]. Instead it uses guard pages and stack
7215 probes (though stack probes are not yet implemented on any platform
7217 * [The compiler matches traits faster when projections are involved][p].
7218 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7220 * [Cargo now displays useful information about what its doing during
7221 `cargo update`][cu].
7223 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7224 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7225 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7226 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7227 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7228 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7229 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7230 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7231 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7232 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7233 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7234 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7235 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7236 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7237 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7238 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7239 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7240 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7241 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7242 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7243 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7244 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7245 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7246 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7247 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7248 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7249 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7250 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7251 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7252 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7253 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7254 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7255 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7256 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7257 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7258 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7259 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7260 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7261 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7262 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7263 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7264 [bh2]: https://github.com/rust-lang/rust/pull/28156
7265 [binfat]: https://github.com/rust-lang/rust/pull/28270
7266 [bm]: https://github.com/rust-lang/rust/pull/28197
7267 [cc]: https://github.com/rust-lang/rust/pull/27531
7268 [crlf]: https://github.com/rust-lang/rust/pull/28034
7269 [cu]: https://github.com/rust-lang/cargo/pull/1931
7270 [d]: https://github.com/rust-lang/rust/pull/27825
7271 [dep]: https://github.com/rust-lang/rust/pull/28339
7272 [es]: https://github.com/rust-lang/rust/pull/27956
7273 [ext]: https://github.com/rust-lang/rust/pull/28094
7274 [faststr]: https://github.com/rust-lang/rust/pull/28338
7275 [ffi]: https://github.com/rust-lang/rust/pull/28779
7276 [fp]: https://github.com/rust-lang/rust/pull/28268
7277 [fp2]: https://github.com/rust-lang/rust/pull/28560
7278 [fp3]: https://github.com/rust-lang/rust/pull/27307
7279 [i]: https://github.com/rust-lang/rust/pull/27451
7280 [into2]: https://github.com/rust-lang/rust/pull/28039
7281 [it]: https://github.com/rust-lang/rust/pull/27652
7282 [mm]: https://github.com/rust-lang/rust/pull/27338
7283 [mutw]: https://github.com/rust-lang/rust/pull/28368
7284 [sound]: https://github.com/rust-lang/rust/pull/27641
7285 [p]: https://github.com/rust-lang/rust/pull/27866
7286 [pec]: https://github.com/rust-lang/rust/pull/28486
7287 [pr]: https://github.com/rust-lang/rust/pull/27896
7288 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7289 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7290 [s]: https://github.com/rust-lang/rust/pull/27474
7291 [stab]: https://github.com/rust-lang/rust/pull/28339
7292 [stat]: https://github.com/rust-lang/rust/pull/28321
7293 [vd]: https://github.com/rust-lang/rust/pull/28494
7295 Version 1.3.0 (2015-09-17)
7296 ==============================
7298 * ~900 changes, numerous bugfixes
7303 * The [new object lifetime defaults][nold] have been [turned
7304 on][nold2] after a cycle of warnings about the change. Now types
7305 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7306 being interpreted as `&'a Box<Trait+'a>` to `&'a
7307 Box<Trait+'static>`.
7308 * [The Rustonomicon][nom] is a new book in the official documentation
7309 that dives into writing unsafe Rust.
7310 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7311 timekeeping is employed by other std APIs, as well as out-of-tree
7317 * The [new object lifetime defaults][nold] have been [turned
7318 on][nold2] after a cycle of warnings about the change.
7319 * There is a known [regression][lr] in how object lifetime elision is
7320 interpreted, the proper solution for which is undetermined.
7321 * The `#[prelude_import]` attribute, an internal implementation
7322 detail, was accidentally stabilized previously. [It has been put
7323 behind the `prelude_import` feature gate][pi]. This change is
7324 believed to break no existing code.
7325 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7326 [more sane for dynamically sized types][dst3]. Code that relied on
7327 the previous behavior is thought to be broken.
7328 * The `dropck` rules, which checks that destructors can't access
7329 destroyed values, [have been updated][dropck] to match the
7330 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7331 cause some previously-compiling code to no longer build.
7336 * The [new object lifetime defaults][nold] have been [turned
7337 on][nold2] after a cycle of warnings about the change.
7338 * Semicolons may [now follow types and paths in
7339 macros](https://github.com/rust-lang/rust/pull/27000).
7340 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7341 [more sane for dynamically sized types][dst3]. Code that relied on
7342 the previous behavior is not known to exist, and suspected to be
7344 * `'static` variables [may now be recursive][st].
7345 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7346 implementations correctly.
7347 * The `dropck` rules, which checks that destructors can't access
7348 destroyed values, [have been updated][dropck] to match the
7354 * The [`Duration`] API, [has been stabilized][ds], as well as the
7355 `std::time` module, which presently contains only `Duration`.
7356 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7357 * The owned C string, [`CString`], implements [`Borrow`] and the
7358 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7359 these allow C strings to be borrowed and cloned in generic code.
7360 * [`CStr`] implements [`Debug`].
7361 * [`AtomicPtr`] implements [`Debug`].
7362 * [`Error`] trait objects [can be downcast to their concrete types][e]
7363 in many common configurations, using the [`is`], [`downcast`],
7364 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7366 * Searching for substrings now [employs the two-way algorithm][search]
7367 instead of doing a naive search. This gives major speedups to a
7368 number of methods, including [`contains`][sc], [`find`][sf],
7369 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7370 [`ends_with`][sew] are also faster.
7371 * The performance of `PartialEq` for slices is [much faster][ps].
7372 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7373 is overridden and optimized by the implementations for scalars.
7374 * The [`Hasher`] trait now has a number of specialized `write_*`
7375 methods for primitive types, for efficiency.
7376 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7377 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7378 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7379 of [`std::error::Error::cause`][iec] also delegates to the inner
7381 * [`process::Child`][pc] gained the [`id`] method, which returns a
7382 `u32` representing the platform-specific process identifier.
7383 * The [`connect`] method on slices is deprecated, replaced by the new
7384 [`join`] method (note that both of these are on the *unstable*
7385 [`SliceConcatExt`] trait, but through the magic of the prelude are
7386 available to stable code anyway).
7387 * The [`Div`] operator is implemented for [`Wrapping`] types.
7388 * [`DerefMut` is implemented for `String`][dms].
7389 * Performance of SipHash (the default hasher for `HashMap`) is
7390 [better for long data][sh].
7391 * [`AtomicPtr`] implements [`Send`].
7392 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7393 are now [specialized to use uninitialized buffers for increased
7395 * Lifetime parameters of foreign functions [are now resolved
7401 * Rust can now, with some coercion, [produce programs that run on
7402 Windows XP][xp], though XP is not considered a supported platform.
7403 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7404 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7405 recommended for use in 1.3, though should be fully-functional
7406 in the [64-bit 1.4 beta][b14].
7407 * On Fedora-based systems installation will [properly configure the
7408 dynamic linker][fl].
7409 * The compiler gained many new extended error descriptions, which can
7410 be accessed with the `--explain` flag.
7411 * The `dropck` pass, which checks that destructors can't access
7412 destroyed values, [has been rewritten][dropck]. This fixes some
7413 soundness holes, and as such will cause some previously-compiling
7414 code to no longer build.
7415 * `rustc` now uses [LLVM to write archive files where possible][ar].
7416 Eventually this will eliminate the compiler's dependency on the ar
7418 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7419 supported FreeBSD on x86_64).
7420 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7421 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7423 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7424 will kill the process instead of leaking][nlp].
7426 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7427 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7428 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7429 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7430 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7431 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7432 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7433 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7434 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7435 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7436 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7437 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7438 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7439 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7440 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7441 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7442 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7443 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7444 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7445 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7446 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7447 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7448 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7449 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7450 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7451 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7452 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7453 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7454 [ar]: https://github.com/rust-lang/rust/pull/26926
7455 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7456 [dms]: https://github.com/rust-lang/rust/pull/26241
7457 [dropck]: https://github.com/rust-lang/rust/pull/27261
7458 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7459 [ds]: https://github.com/rust-lang/rust/pull/26818
7460 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7461 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7462 [dst3]: https://github.com/rust-lang/rust/pull/27351
7463 [e]: https://github.com/rust-lang/rust/pull/24793
7464 [f]: https://github.com/rust-lang/rust/pull/26588
7465 [fb]: https://github.com/rust-lang/rust/pull/26959
7466 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7467 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7468 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7469 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7470 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7471 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7472 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7473 [lic]: https://github.com/rust-lang/rust/pull/26583
7474 [lnu]: https://github.com/rust-lang/rust/pull/27026
7475 [lr]: https://github.com/rust-lang/rust/issues/27248
7476 [lum]: https://github.com/rust-lang/rust/pull/26378
7477 [lur]: https://github.com/rust-lang/rust/pull/26783
7478 [nlp]: https://github.com/rust-lang/rust/pull/27176
7479 [nold2]: https://github.com/rust-lang/rust/pull/27045
7480 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7481 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7482 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7483 [pi]: https://github.com/rust-lang/rust/pull/26699
7484 [ps]: https://github.com/rust-lang/rust/pull/26884
7485 [rte]: https://github.com/rust-lang/rust/pull/26950
7486 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7487 [search]: https://github.com/rust-lang/rust/pull/26327
7488 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7489 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7490 [sh]: https://github.com/rust-lang/rust/pull/27280
7491 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7492 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7493 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7494 [st]: https://github.com/rust-lang/rust/pull/26630
7495 [win1]: https://github.com/rust-lang/rust/pull/26569
7496 [win2]: https://github.com/rust-lang/rust/pull/26741
7497 [win3]: https://github.com/rust-lang/rust/pull/26741
7498 [win4]: https://github.com/rust-lang/rust/pull/27210
7499 [xp]: https://github.com/rust-lang/rust/pull/26569
7501 Version 1.2.0 (2015-08-07)
7502 ==========================
7504 * ~1200 changes, numerous bugfixes
7509 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7510 like `Rc` to contain types without a fixed size, arrays and trait
7511 objects, finally enabling use of `Rc<[T]>` and completing the
7512 implementation of DST.
7513 * [Parallel codegen][parcodegen] is now working again, which can
7514 substantially speed up large builds in debug mode; It also gets
7515 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7516 jobs). It's not enabled by default, but will be "in the near
7517 future". It can be activated with the `-C codegen-units=N` flag to
7519 * This is the first release with [experimental support for linking
7520 with the MSVC linker and lib C on Windows (instead of using the GNU
7521 variants via MinGW)][win]. It is yet recommended only for the most
7522 intrepid Rustaceans.
7523 * Benchmark compilations are showing a 30% improvement in
7524 bootstrapping over 1.1.
7529 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7530 unicode case mapping, which is a previously-planned change in
7531 behavior and considered a bugfix.
7532 * [`mem::align_of`] now specifies [the *minimum alignment* for
7533 T][align], which is usually the alignment programs are interested
7534 in, and the same value reported by clang's
7535 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7537 * [The `#[packed]` attribute is no longer silently accepted by the
7538 compiler][packed]. This attribute did nothing and code that
7539 mentioned it likely did not work as intended.
7540 * Associated type defaults are [now behind the
7541 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7542 defaults *did not work*, but could be mentioned syntactically. As
7543 such this breakage has minimal impact.
7548 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7549 matching against dereferenceable values.
7554 * The [`Extend`] trait, which grows a collection from an iterator, is
7555 implemented over iterators of references, for `String`, `Vec`,
7556 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7557 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7558 * The [`iter::once`] function returns an iterator that yields a single
7559 element, and [`iter::empty`] returns an iterator that yields no
7561 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7562 over substring matches.
7563 * [`Cell`] and [`RefCell`] both implement `Eq`.
7564 * A number of methods for wrapping arithmetic are added to the
7565 integral types, [`wrapping_div`], [`wrapping_rem`],
7566 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7567 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7568 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7569 type.. It is illegal for the default arithmetic operations in Rust
7570 to overflow; the desire to wrap must be explicit.
7571 * The `{:#?}` formatting specifier [displays the alternate,
7572 pretty-printed][debugfmt] form of the `Debug` formatter. This
7573 feature was actually introduced prior to 1.0 with little
7575 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7576 for writing data to formatted strings, similar to [`io::Write`].
7577 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7578 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7579 are used by code generators to emit implementations of [`Debug`].
7580 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7581 methods that convert case, following Unicode case mapping.
7582 * It is now easier to handle poisoned locks. The [`PoisonError`]
7583 type, returned by failing lock operations, exposes `into_inner`,
7584 `get_ref`, and `get_mut`, which all give access to the inner lock
7585 guard, and allow the poisoned lock to continue to operate. The
7586 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7587 poisoned lock without attempting to take the lock.
7588 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7589 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7590 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7591 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7593 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7599 * `rustc` employs smarter heuristics for guessing at [typos].
7600 * `rustc` emits more efficient code for [no-op conversions between
7601 unsafe pointers][nop].
7602 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7603 resulting in faster compile times and smaller code.
7605 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7606 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7607 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7608 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7609 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7610 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7611 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7612 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7613 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7614 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7615 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7616 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7617 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7618 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7619 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7620 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7621 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7622 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7623 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7624 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7625 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7626 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7627 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7628 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7629 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7630 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7631 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7632 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7633 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7634 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7635 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7636 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7637 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7638 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7639 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7640 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7641 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7642 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7643 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7644 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7645 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7646 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7647 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7648 [align]: https://github.com/rust-lang/rust/pull/25646
7649 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7650 [typos]: https://github.com/rust-lang/rust/pull/26087
7651 [nop]: https://github.com/rust-lang/rust/pull/26336
7652 [fat]: https://github.com/rust-lang/rust/pull/26411
7653 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7654 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7655 [packed]: https://github.com/rust-lang/rust/pull/25541
7656 [ad]: https://github.com/rust-lang/rust/pull/27382
7657 [win]: https://github.com/rust-lang/rust/pull/25350
7659 Version 1.1.0 (2015-06-25)
7660 =========================
7662 * ~850 changes, numerous bugfixes
7667 * The [`std::fs` module has been expanded][fs] to expand the set of
7668 functionality exposed:
7669 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7670 don't incur a syscall on some platforms.
7671 * A `symlink_metadata` function has been added.
7672 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7673 access to all underlying information.
7674 * The compiler now contains extended explanations of many errors. When an error
7675 with an explanation occurs the compiler suggests using the `--explain` flag
7676 to read the explanation. Error explanations are also [available online][err-index].
7677 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7678 well as other work, the time to bootstrap the compiler decreased by
7684 * The [`str::split_whitespace`] method splits a string on unicode
7685 whitespace boundaries.
7686 * On both Windows and Unix, new extension traits provide conversion of
7687 I/O types to and from the underlying system handles. On Unix, these
7688 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7689 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7690 `TcpListener`, and `UpdSocket`. Further implementations for
7691 `std::process` will be stabilized later.
7692 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7693 Windows, symlinks can be created with
7694 `std::os::windows::symlink_dir` and
7695 `std::os::windows::symlink_file`.
7696 * The `mpsc::Receiver` type can now be converted into an iterator with
7697 `into_iter` on the [`IntoIterator`] trait.
7698 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7699 implementation of the [`From`] trait.
7700 * The `Debug` implementation for `RangeFull` [creates output that is
7701 more consistent with other implementations][rf].
7702 * [`Debug` is implemented for `File`][file].
7703 * The `Default` implementation for `Arc` [no longer requires `Sync +
7705 * [The `Iterator` methods `count`, `nth`, and `last` have been
7706 overridden for slices to have O(1) performance instead of O(n)][si].
7707 * Incorrect handling of paths on Windows has been improved in both the
7708 compiler and the standard library.
7709 * [`AtomicPtr` gained a `Default` implementation][ap].
7710 * In accordance with Rust's policy on arithmetic overflow `abs` now
7711 [panics on overflow when debug assertions are enabled][abs].
7712 * The [`Cloned`] iterator, which was accidentally left unstable for
7713 1.0 [has been stabilized][c].
7714 * The [`Incoming`] iterator, which iterates over incoming TCP
7715 connections, and which was accidentally unnamable in 1.0, [is now
7716 properly exported][inc].
7717 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7718 `sift_up` or `sift_down` panic][bh].
7719 * The [`split_off`] method of `LinkedList` [no longer corrupts
7720 the list in certain scenarios][ll].
7725 * Type checking performance [has improved notably][sk] with
7726 [multiple improvements][pre].
7727 * The compiler [suggests code changes][ch] for more errors.
7728 * rustc and it's build system have experimental support for [building
7729 toolchains against MUSL][m] instead of glibc on Linux.
7730 * The compiler defines the `target_env` cfg value, which is used for
7731 distinguishing toolchains that are otherwise for the same
7732 platform. Presently this is set to `gnu` for common GNU Linux
7733 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7734 * The [`cargo rustc`][crc] command invokes a build with custom flags
7736 * [Android executables are always position independent][pie].
7737 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7740 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7741 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7742 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7743 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7744 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7745 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7746 [rf]: https://github.com/rust-lang/rust/pull/24491
7747 [err-index]: https://doc.rust-lang.org/error-index.html
7748 [sk]: https://github.com/rust-lang/rust/pull/24615
7749 [pre]: https://github.com/rust-lang/rust/pull/25323
7750 [file]: https://github.com/rust-lang/rust/pull/24598
7751 [ch]: https://github.com/rust-lang/rust/pull/24683
7752 [arc]: https://github.com/rust-lang/rust/pull/24695
7753 [si]: https://github.com/rust-lang/rust/pull/24701
7754 [ap]: https://github.com/rust-lang/rust/pull/24834
7755 [m]: https://github.com/rust-lang/rust/pull/24777
7756 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7757 [crc]: https://github.com/rust-lang/cargo/pull/1568
7758 [pie]: https://github.com/rust-lang/rust/pull/24953
7759 [abs]: https://github.com/rust-lang/rust/pull/25441
7760 [c]: https://github.com/rust-lang/rust/pull/25496
7761 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7762 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7763 [inc]: https://github.com/rust-lang/rust/pull/25522
7764 [bh]: https://github.com/rust-lang/rust/pull/25856
7765 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7766 [ll]: https://github.com/rust-lang/rust/pull/26022
7767 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7768 [drop]: https://github.com/rust-lang/rust/pull/24935
7770 Version 1.0.0 (2015-05-15)
7771 ========================
7773 * ~1500 changes, numerous bugfixes
7778 * The vast majority of the standard library is now `#[stable]`. It is
7779 no longer possible to use unstable features with a stable build of
7781 * Many popular crates on [crates.io] now work on the stable release
7783 * Arithmetic on basic integer types now [checks for overflow in debug
7789 * Several [restrictions have been added to trait coherence][coh] in
7790 order to make it easier for upstream authors to change traits
7791 without breaking downstream code.
7792 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7793 improve error messages and macro behavior. For example, `0b1234` is
7794 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7795 * Trait bounds [are always invariant][inv], eliminating the need for
7796 the `PhantomFn` and `MarkerTrait` lang items, which have been
7798 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7799 "foo" as bar` syntax has been replaced with `extern crate foo as
7800 bar`, and Cargo now automatically translates "-" in *package* names
7801 to underscore for the crate name.
7802 * [Lifetime shadowing is an error][lt].
7803 * [`Send` no longer implies `'static`][send-rfc].
7804 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7805 `MyType::default()`.
7806 * Primitive types [now have inherent methods][prim-inherent],
7807 obviating the need for extension traits like `SliceExt`.
7808 * Methods with `Self: Sized` in their `where` clause are [considered
7809 object-safe][self-sized], allowing many extension traits like
7810 `IteratorExt` to be merged into the traits they extended.
7811 * You can now [refer to associated types][assoc-where] whose
7812 corresponding trait bounds appear only in a `where` clause.
7813 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7814 like `Send` and `Sync` are now library-defined.
7815 * A [Reflect trait][reflect] was introduced, which means that
7816 downcasting via the `Any` trait is effectively limited to concrete
7817 types. This helps retain the potentially-important "parametricity"
7818 property: generic code cannot behave differently for different type
7819 arguments except in minor ways.
7820 * The `unsafe_destructor` feature is now deprecated in favor of the
7821 [new `dropck`][dropck]. This change is a major reduction in unsafe
7827 * The `thread_local` module [has been renamed to `std::thread`][th].
7828 * The methods of `IteratorExt` [have been moved to the `Iterator`
7830 * Several traits that implement Rust's conventions for type
7831 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7832 [centralized in the `std::convert` module][con].
7833 * The `FromError` trait [was removed in favor of `From`][fe].
7834 * The basic sleep function [has moved to
7835 `std::thread::sleep_ms`][slp].
7836 * The `splitn` function now takes an `n` parameter that represents the
7837 number of items yielded by the returned iterator [instead of the
7838 number of 'splits'][spl].
7839 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7840 * [Derived implementations of `PartialOrd` now order enums according
7841 to their explicitly-assigned discriminants][po].
7842 * [Methods for searching strings are generic over `Pattern`s][pat],
7843 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7845 * [In method resolution, object methods are resolved before inherent
7847 * [`String::from_str` has been deprecated in favor of the `From` impl,
7848 `String::from`][sf].
7849 * [`io::Error` implements `Sync`][ios].
7850 * [The `words` method on `&str` has been replaced with
7851 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7853 * The new path and IO modules are complete and `#[stable]`. This
7854 was the major library focus for this cycle.
7855 * The path API was [revised][path-normalize] to normalize `.`,
7856 adjusting the tradeoffs in favor of the most common usage.
7857 * A large number of remaining APIs in `std` were also stabilized
7858 during this cycle; about 75% of the non-deprecated API surface
7860 * The new [string pattern API][string-pattern] landed, which makes
7861 the string slice API much more internally consistent and flexible.
7862 * A new set of [generic conversion traits][conversion] replaced
7863 many existing ad hoc traits.
7864 * Generic numeric traits were [completely removed][num-traits]. This
7865 was made possible thanks to inherent methods for primitive types,
7866 and the removal gives maximal flexibility for designing a numeric
7867 hierarchy in the future.
7868 * The `Fn` traits are now related via [inheritance][fn-inherit]
7869 and provide ergonomic [blanket implementations][fn-blanket].
7870 * The `Index` and `IndexMut` traits were changed to
7871 [take the index by value][index-value], enabling code like
7872 `hash_map["string"]` to work.
7873 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7874 `Copy` data is known to be `Clone` as well.
7879 * Many errors now have extended explanations that can be accessed with
7880 the `--explain` flag to `rustc`.
7881 * Many new examples have been added to the standard library
7883 * rustdoc has received a number of improvements focused on completion
7885 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7886 * Much headway was made on ecosystem-wide CI, making it possible
7887 to [compare builds for breakage][ci-compare].
7890 [crates.io]: http://crates.io
7891 [clo]: https://github.com/rust-lang/rust/pull/24034
7892 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7893 [con]: https://github.com/rust-lang/rust/pull/23875
7894 [cr]: https://github.com/rust-lang/rust/pull/23419
7895 [fe]: https://github.com/rust-lang/rust/pull/23879
7896 [ie]: https://github.com/rust-lang/rust/pull/23300
7897 [inv]: https://github.com/rust-lang/rust/pull/23938
7898 [ios]: https://github.com/rust-lang/rust/pull/24133
7899 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7900 [lt]: https://github.com/rust-lang/rust/pull/24057
7901 [meth]: https://github.com/rust-lang/rust/pull/24056
7902 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7903 [po]: https://github.com/rust-lang/rust/pull/24270
7904 [sf]: https://github.com/rust-lang/rust/pull/24517
7905 [slp]: https://github.com/rust-lang/rust/pull/23949
7906 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7907 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7908 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7909 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7910 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7911 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7912 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7913 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7914 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7915 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7916 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7917 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7918 [reflect]: https://github.com/rust-lang/rust/pull/23712
7919 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7920 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7921 [index-value]: https://github.com/rust-lang/rust/pull/23601
7922 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7923 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7924 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7925 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7926 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7927 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7930 Version 1.0.0-alpha.2 (2015-02-20)
7931 =====================================
7933 * ~1300 changes, numerous bugfixes
7937 * The various I/O modules were [overhauled][io-rfc] to reduce
7938 unnecessary abstractions and provide better interoperation with
7939 the underlying platform. The old `io` module remains temporarily
7941 * The standard library now [participates in feature gating][feat],
7942 so use of unstable libraries now requires a `#![feature(...)]`
7943 attribute. The impact of this change is [described on the
7944 forum][feat-forum]. [RFC][feat-rfc].
7948 * `for` loops [now operate on the `IntoIterator` trait][into],
7949 which eliminates the need to call `.iter()`, etc. to iterate
7950 over collections. There are some new subtleties to remember
7951 though regarding what sort of iterators various types yield, in
7952 particular that `for foo in bar { }` yields values from a move
7953 iterator, destroying the original collection. [RFC][into-rfc].
7954 * Objects now have [default lifetime bounds][obj], so you don't
7955 have to write `Box<Trait+'static>` when you don't care about
7956 storing references. [RFC][obj-rfc].
7957 * In types that implement `Drop`, [lifetimes must outlive the
7958 value][drop]. This will soon make it possible to safely
7959 implement `Drop` for types where `#[unsafe_destructor]` is now
7960 required. Read the [gorgeous RFC][drop-rfc] for details.
7961 * The fully qualified <T as Trait>::X syntax lets you set the Self
7962 type for a trait method or associated type. [RFC][ufcs-rfc].
7963 * References to types that implement `Deref<U>` now [automatically
7964 coerce to references][deref] to the dereferenced type `U`,
7965 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7966 should eliminate many unsightly uses of `&*`, as when converting
7967 from references to vectors into references to
7968 slices. [RFC][deref-rfc].
7969 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7970 `|:|`) is obsolete and closure kind is inferred from context.
7971 * [`Self` is a keyword][Self].
7975 * The `Show` and `String` formatting traits [have been
7976 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7977 their related purposes. Automatically getting a string
7978 conversion to use with `format!("{:?}", something_to_debug)` is
7979 now written `#[derive(Debug)]`.
7980 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7981 OsStr}`, provide strings in platform-specific encodings for easier
7982 interop with system APIs. [RFC][osstr-rfc].
7983 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7984 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7985 creating raw pointers.
7989 * Certain long error messages of the form 'expected foo found bar'
7990 are now [split neatly across multiple
7991 lines][multiline]. Examples in the PR.
7992 * On Unix Rust can be [uninstalled][un] by running
7993 `/usr/local/lib/rustlib/uninstall.sh`.
7994 * The `#[rustc_on_unimplemented]` attribute, requiring the
7995 'on_unimplemented' feature, lets rustc [display custom error
7996 messages when a trait is expected to be implemented for a type
8001 * Rust is tested against a [LALR grammar][lalr], which parses
8002 almost all the Rust files that rustc does.
8004 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8005 [close]: https://github.com/rust-lang/rust/pull/21843
8006 [deref]: https://github.com/rust-lang/rust/pull/21351
8007 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8008 [drop]: https://github.com/rust-lang/rust/pull/21972
8009 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8010 [feat]: https://github.com/rust-lang/rust/pull/21248
8011 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8012 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8013 [fmt]: https://github.com/rust-lang/rust/pull/21457
8014 [into]: https://github.com/rust-lang/rust/pull/20790
8015 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8016 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8017 [lalr]: https://github.com/rust-lang/rust/pull/21452
8018 [multiline]: https://github.com/rust-lang/rust/pull/19870
8019 [obj]: https://github.com/rust-lang/rust/pull/22230
8020 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8021 [onun]: https://github.com/rust-lang/rust/pull/20889
8022 [osstr]: https://github.com/rust-lang/rust/pull/21488
8023 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8024 [Self]: https://github.com/rust-lang/rust/pull/22158
8025 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8026 [un]: https://github.com/rust-lang/rust/pull/22256
8029 Version 1.0.0-alpha (2015-01-09)
8030 ==================================
8032 * ~2400 changes, numerous bugfixes
8036 * The language itself is considered feature complete for 1.0,
8037 though there will be many usability improvements and bugfixes
8038 before the final release.
8039 * Nearly 50% of the public API surface of the standard library has
8040 been declared 'stable'. Those interfaces are unlikely to change
8042 * The long-running debate over integer types has been
8043 [settled][ints]: Rust will ship with types named `isize` and
8044 `usize`, rather than `int` and `uint`, for pointer-sized
8045 integers. Guidelines will be rolled out during the alpha cycle.
8046 * Most crates that are not `std` have been moved out of the Rust
8047 distribution into the Cargo ecosystem so they can evolve
8048 separately and don't need to be stabilized as quickly, including
8049 'time', 'getopts', 'num', 'regex', and 'term'.
8050 * Documentation continues to be expanded with more API coverage, more
8051 examples, and more in-depth explanations. The guides have been
8052 consolidated into [The Rust Programming Language][trpl].
8053 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8054 * All official Rust binary installers now come with [Cargo], the
8055 Rust package manager.
8059 * Closures have been [completely redesigned][unboxed] to be
8060 implemented in terms of traits, can now be used as generic type
8061 bounds and thus monomorphized and inlined, or via an opaque
8062 pointer (boxed) as in the old system. The new system is often
8063 referred to as 'unboxed' closures.
8064 * Traits now support [associated types][assoc], allowing families
8065 of related types to be defined together and used generically in
8067 * Enum variants are [namespaced by their type names][enum].
8068 * [`where` clauses][where] provide a more versatile and attractive
8069 syntax for specifying generic bounds, though the previous syntax
8071 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8073 * Rust [no longer has a runtime][rt] of any description, and only
8074 supports OS threads, not green threads.
8075 * At long last, Rust has been overhauled for 'dynamically-sized
8076 types' ([DST]), which integrates 'fat pointers' (object types,
8077 arrays, and `str`) more deeply into the type system, making it
8079 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8080 `..j` that produce range types and which, when combined with the
8081 `Index` operator and multidispatch, leads to a convenient slice
8083 * The new range syntax revealed an ambiguity in the fixed-length
8084 array syntax, so now fixed length arrays [are written `[T;
8086 * The `Copy` trait is no longer implemented automatically. Unsafe
8087 pointers no longer implement `Sync` and `Send` so types
8088 containing them don't automatically either. `Sync` and `Send`
8089 are now 'unsafe traits' so one can "forcibly" implement them via
8090 `unsafe impl` if a type confirms to the requirements for them
8091 even though the internals do not (e.g. structs containing unsafe
8092 pointers like `Arc`). These changes are intended to prevent some
8093 footguns and are collectively known as [opt-in built-in
8094 traits][oibit] (though `Sync` and `Send` will soon become pure
8095 library types unknown to the compiler).
8096 * Operator traits now take their operands [by value][ops], and
8097 comparison traits can use multidispatch to compare one type
8098 against multiple other types, allowing e.g. `String` to be
8099 compared with `&str`.
8100 * `if let` and `while let` are no longer feature-gated.
8101 * Rust has adopted a more [uniform syntax for escaping unicode
8102 characters][unicode].
8103 * `macro_rules!` [has been declared stable][mac]. Though it is a
8104 flawed system it is sufficiently popular that it must be usable
8105 for 1.0. Effort has gone into [future-proofing][mac-future] it
8106 in ways that will allow other macro systems to be developed in
8107 parallel, and won't otherwise impact the evolution of the
8109 * The prelude has been [pared back significantly][prelude] such
8110 that it is the minimum necessary to support the most pervasive
8111 code patterns, and through [generalized where clauses][where]
8112 many of the prelude extension traits have been consolidated.
8113 * Rust's rudimentary reflection [has been removed][refl], as it
8114 incurred too much code generation for little benefit.
8115 * [Struct variants][structvars] are no longer feature-gated.
8116 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8117 known as 'higher-ranked trait bounds', this crucially allows
8118 unboxed closures to work.
8119 * Macros invocations surrounded by parens or square brackets and
8120 not terminated by a semicolon are [parsed as
8121 expressions][macros], which makes expressions like `vec![1i32,
8122 2, 3].len()` work as expected.
8123 * Trait objects now implement their traits automatically, and
8124 traits that can be coerced to objects now must be [object
8126 * Automatically deriving traits is now done with `#[derive(...)]`
8127 not `#[deriving(...)]` for [consistency with other naming
8128 conventions][derive].
8129 * Importing the containing module or enum at the same time as
8130 items or variants they contain is [now done with `self` instead
8131 of `mod`][self], as in use `foo::{self, bar}`
8132 * Glob imports are no longer feature-gated.
8133 * The `box` operator and `box` patterns have been feature-gated
8134 pending a redesign. For now unique boxes should be allocated
8135 like other containers, with `Box::new`.
8139 * A [series][coll1] of [efforts][coll2] to establish
8140 [conventions][coll3] for collections types has resulted in API
8141 improvements throughout the standard library.
8142 * New [APIs for error handling][err] provide ergonomic interop
8143 between error types, and [new conventions][err-conv] describe
8144 more clearly the recommended error handling strategies in Rust.
8145 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8146 it is easier to discuss failure in the context of error handling
8147 without making clarifications as to whether you are referring to
8148 the 'fail' macro or failure more generally.
8149 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8150 syscall when available.
8151 * The 'serialize' crate has been renamed 'rustc-serialize' and
8152 moved out of the distribution to Cargo. Although it is widely
8153 used now, it is expected to be superseded in the near future.
8154 * The `Show` formatter, typically implemented with
8155 `#[derive(Show)]` is [now requested with the `{:?}`
8156 specifier][show] and is intended for use by all types, for uses
8157 such as `println!` debugging. The new `String` formatter must be
8158 implemented by hand, uses the `{}` specifier, and is intended
8159 for full-fidelity conversions of things that can logically be
8160 represented as strings.
8164 * [Flexible target specification][flex] allows rustc's code
8165 generation to be configured to support otherwise-unsupported
8167 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8168 respective debuggers with Rust-appropriate pretty-printing.
8169 * The Windows installation of Rust is distributed with the
8170 MinGW components currently required to link binaries on that
8175 * Nullable enum optimizations have been extended to more types so
8176 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8177 space than the inner types themselves.
8178 * Work has begun on supporting AArch64.
8180 [Cargo]: https://crates.io
8181 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8182 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8183 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8184 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8185 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8186 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8187 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8188 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8189 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8190 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8191 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8192 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8193 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8194 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8195 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8196 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8197 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8198 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8199 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8200 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8201 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8202 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8203 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8204 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8205 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8206 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8207 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8208 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8209 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8210 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8211 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8212 [trpl]: https://doc.rust-lang.org/book/index.html
8213 [rbe]: http://rustbyexample.com/
8216 Version 0.12.0 (2014-10-09)
8217 =============================
8219 * ~1900 changes, numerous bugfixes
8223 * The introductory documentation (now called The Rust Guide) has
8224 been completely rewritten, as have a number of supplementary
8226 * Rust's package manager, Cargo, continues to improve and is
8227 sometimes considered to be quite awesome.
8228 * Many API's in `std` have been reviewed and updated for
8229 consistency with the in-development Rust coding
8230 guidelines. The standard library documentation tracks
8231 stabilization progress.
8232 * Minor libraries have been moved out-of-tree to the rust-lang org
8233 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8234 be installed with Cargo.
8235 * Lifetime elision allows lifetime annotations to be left off of
8236 function declarations in many common scenarios.
8237 * Rust now works on 64-bit Windows.
8240 * Indexing can be overloaded with the `Index` and `IndexMut`
8242 * The `if let` construct takes a branch only if the `let` pattern
8243 matches, currently behind the 'if_let' feature gate.
8244 * 'where clauses', a more flexible syntax for specifying trait
8245 bounds that is more aesthetic, have been added for traits and
8246 free functions. Where clauses will in the future make it
8247 possible to constrain associated types, which would be
8248 impossible with the existing syntax.
8249 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8250 the 'slicing_syntax' feature gate, and can be overloaded with
8251 the `Slice` or `SliceMut` traits.
8252 * The syntax for matching of sub-slices has been changed to use a
8253 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8254 consistency with other uses of `..` and to future-proof
8255 potential additional uses of the syntax.
8256 * The syntax for matching inclusive ranges in patterns has changed
8257 from `0..3` to `0...4` to be consistent with the exclusive range
8259 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8260 c]`) has been put behind the 'advanced_slice_patterns' feature
8261 gate and may be removed in the future.
8262 * Components of tuples and tuple structs can be extracted using
8263 the `value.0` syntax, currently behind the `tuple_indexing`
8265 * The `#[crate_id]` attribute is no longer supported; versioning
8266 is handled by the package manager.
8267 * Renaming crate imports are now written `extern crate foo as bar`
8268 instead of `extern crate bar = foo`.
8269 * Renaming use statements are now written `use foo as bar` instead
8271 * `let` and `match` bindings and argument names in macros are now
8273 * The new, more efficient, closure types ('unboxed closures') have
8274 been added under a feature gate, 'unboxed_closures'. These will
8275 soon replace the existing closure types, once higher-ranked
8276 trait lifetimes are added to the language.
8277 * `move` has been added as a keyword, for indicating closures
8278 that capture by value.
8279 * Mutation and assignment is no longer allowed in pattern guards.
8280 * Generic structs and enums can now have trait bounds.
8281 * The `Share` trait is now called `Sync` to free up the term
8282 'shared' to refer to 'shared reference' (the default reference
8284 * Dynamically-sized types have been mostly implemented,
8285 unifying the behavior of fat-pointer types with the rest of the
8287 * As part of dynamically-sized types, the `Sized` trait has been
8288 introduced, which qualifying types implement by default, and
8289 which type parameters expect by default. To specify that a type
8290 parameter does not need to be sized, write `<Sized? T>`. Most
8291 types are `Sized`, notable exceptions being unsized arrays
8292 (`[T]`) and trait types.
8293 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8294 * Lifetime bounds can now be applied to type parameters and object
8296 * The old, reference counted GC type, `Gc<T>` which was once
8297 denoted by the `@` sigil, has finally been removed. GC will be
8298 revisited in the future.
8301 * Library documentation has been improved for a number of modules.
8302 * Bit-vectors, collections::bitv has been modernized.
8303 * The url crate is deprecated in favor of
8304 http://github.com/servo/rust-url, which can be installed with
8306 * Most I/O stream types can be cloned and subsequently closed from
8308 * A `std::time::Duration` type has been added for use in I/O
8309 methods that rely on timers, as well as in the 'time' crate's
8310 `Timespec` arithmetic.
8311 * The runtime I/O abstraction layer that enabled the green thread
8312 scheduler to do non-thread-blocking I/O has been removed, along
8313 with the libuv-based implementation employed by the green thread
8314 scheduler. This will greatly simplify the future I/O work.
8315 * `collections::btree` has been rewritten to have a more
8316 idiomatic and efficient design.
8319 * rustdoc output now indicates the stability levels of API's.
8320 * The `--crate-name` flag can specify the name of the crate
8321 being compiled, like `#[crate_name]`.
8322 * The `-C metadata` specifies additional metadata to hash into
8323 symbol names, and `-C extra-filename` specifies additional
8324 information to put into the output filename, for use by the
8325 package manager for versioning.
8326 * debug info generation has continued to improve and should be
8327 more reliable under both gdb and lldb.
8328 * rustc has experimental support for compiling in parallel
8329 using the `-C codegen-units` flag.
8330 * rustc no longer encodes rpath information into binaries by
8334 * Stack usage has been optimized with LLVM lifetime annotations.
8335 * Official Rust binaries on Linux are more compatible with older
8336 kernels and distributions, built on CentOS 5.10.
8339 Version 0.11.0 (2014-07-02)
8340 ==========================
8342 * ~1700 changes, numerous bugfixes
8345 * ~[T] has been removed from the language. This type is superseded by
8347 * ~str has been removed from the language. This type is superseded by
8349 * ~T has been removed from the language. This type is superseded by the
8351 * @T has been removed from the language. This type is superseded by the
8352 standard library's std::gc::Gc<T> type.
8353 * Struct fields are now all private by default.
8354 * Vector indices and shift amounts are both required to be a `uint`
8355 instead of any integral type.
8356 * Byte character, byte string, and raw byte string literals are now all
8357 supported by prefixing the normal literal with a `b`.
8358 * Multiple ABIs are no longer allowed in an ABI string
8359 * The syntax for lifetimes on closures/procedures has been tweaked
8360 slightly: `<'a>|A, B|: 'b + K -> T`
8361 * Floating point modulus has been removed from the language; however it
8362 is still provided by a library implementation.
8363 * Private enum variants are now disallowed.
8364 * The `priv` keyword has been removed from the language.
8365 * A closure can no longer be invoked through a &-pointer.
8366 * The `use foo, bar, baz;` syntax has been removed from the language.
8367 * The transmute intrinsic no longer works on type parameters.
8368 * Statics now allow blocks/items in their definition.
8369 * Trait bounds are separated from objects with + instead of : now.
8370 * Objects can no longer be read while they are mutably borrowed.
8371 * The address of a static is now marked as insignificant unless the
8372 #[inline(never)] attribute is placed it.
8373 * The #[unsafe_destructor] attribute is now behind a feature gate.
8374 * Struct literals are no longer allowed in ambiguous positions such as
8375 if, while, match, and for..in.
8376 * Declaration of lang items and intrinsics are now feature-gated by
8378 * Integral literals no longer default to `int`, and floating point
8379 literals no longer default to `f64`. Literals must be suffixed with an
8380 appropriate type if inference cannot determine the type of the
8382 * The Box<T> type is no longer implicitly borrowed to &mut T.
8383 * Procedures are now required to not capture borrowed references.
8386 * The standard library is now a "facade" over a number of underlying
8387 libraries. This means that development on the standard library should
8388 be speedier due to smaller crates, as well as a clearer line between
8390 * A new library, libcore, lives under the standard library's facade
8391 which is Rust's "0-assumption" library, suitable for embedded and
8392 kernel development for example.
8393 * A regex crate has been added to the standard distribution. This crate
8394 includes statically compiled regular expressions.
8395 * The unwrap/unwrap_err methods on Result require a Show bound for
8396 better error messages.
8397 * The return types of the std::comm primitives have been centralized
8398 around the Result type.
8399 * A number of I/O primitives have gained the ability to time out their
8401 * A number of I/O primitives have gained the ability to close their
8402 reading/writing halves to cancel pending operations.
8403 * Reverse iterator methods have been removed in favor of `rev()` on
8404 their forward-iteration counterparts.
8405 * A bitflags! macro has been added to enable easy interop with C and
8406 management of bit flags.
8407 * A debug_assert! macro is now provided which is disabled when
8408 `--cfg ndebug` is passed to the compiler.
8409 * A graphviz crate has been added for creating .dot files.
8410 * The std::cast module has been migrated into std::mem.
8411 * The std::local_data api has been migrated from freestanding functions
8412 to being based on methods.
8413 * The Pod trait has been renamed to Copy.
8414 * jemalloc has been added as the default allocator for types.
8415 * The API for allocating memory has been changed to use proper alignment
8416 and sized deallocation
8417 * Connecting a TcpStream or binding a TcpListener is now based on a
8418 string address and a u16 port. This allows connecting to a hostname as
8420 * The Reader trait now contains a core method, read_at_least(), which
8421 correctly handles many repeated 0-length reads.
8422 * The process-spawning API is now centered around a builder-style
8424 * The :? printing qualifier has been moved from the standard library to
8425 an external libdebug crate.
8426 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8427 have been renamed to Eq/Ord.
8428 * The select/plural methods have been removed from format!. The escapes
8429 for { and } have also changed from \{ and \} to {{ and }},
8431 * The TaskBuilder API has been re-worked to be a true builder, and
8432 extension traits for spawning native/green tasks have been added.
8435 * All breaking changes to the language or libraries now have their
8436 commit message annotated with `[breaking-change]` to allow for easy
8437 discovery of breaking changes.
8438 * The compiler will now try to suggest how to annotate lifetimes if a
8439 lifetime-related error occurs.
8440 * Debug info continues to be improved greatly with general bug fixes and
8441 better support for situations like link time optimization (LTO).
8442 * Usage of syntax extensions when cross-compiling has been fixed.
8443 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8444 -fdata-sections and --gc-sections has been enabled by default
8445 * The compiler is now stricter about where it will load module files
8446 from when a module is declared via `mod foo;`.
8447 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8448 Syntax extensions are now discovered via a "plugin registrar" type
8449 which will be extended in the future to other various plugins.
8450 * Lints have been restructured to allow for dynamically loadable lints.
8451 * A number of rustdoc improvements:
8452 * The HTML output has been visually redesigned.
8453 * Markdown is now powered by hoedown instead of sundown.
8454 * Searching heuristics have been greatly improved.
8455 * The search index has been reduced in size by a great amount.
8456 * Cross-crate documentation via `pub use` has been greatly improved.
8457 * Primitive types are now hyperlinked and documented.
8458 * Documentation has been moved from static.rust-lang.org/doc to
8460 * A new sandbox, play.rust-lang.org, is available for running and
8461 sharing rust code examples on-line.
8462 * Unused attributes are now more robustly warned about.
8463 * The dead_code lint now warns about unused struct fields.
8464 * Cross-compiling to iOS is now supported.
8465 * Cross-compiling to mipsel is now supported.
8466 * Stability attributes are now inherited by default and no longer apply
8467 to intra-crate usage, only inter-crate usage.
8468 * Error message related to non-exhaustive match expressions have been
8472 Version 0.10 (2014-04-03)
8473 =========================
8475 * ~1500 changes, numerous bugfixes
8478 * A new RFC process is now in place for modifying the language.
8479 * Patterns with `@`-pointers have been removed from the language.
8480 * Patterns with unique vectors (`~[T]`) have been removed from the
8482 * Patterns with unique strings (`~str`) have been removed from the
8484 * `@str` has been removed from the language.
8485 * `@[T]` has been removed from the language.
8486 * `@self` has been removed from the language.
8487 * `@Trait` has been removed from the language.
8488 * Headers on `~` allocations which contain `@` boxes inside the type for
8489 reference counting have been removed.
8490 * The semantics around the lifetimes of temporary expressions have changed,
8491 see #3511 and #11585 for more information.
8492 * Cross-crate syntax extensions are now possible, but feature gated. See
8493 #11151 for more information. This includes both `macro_rules!` macros as
8494 well as syntax extensions such as `format!`.
8495 * New lint modes have been added, and older ones have been turned on to be
8497 * Unnecessary parentheses
8500 * Uppercase variables
8501 * Publicly visible private types
8502 * `#[deriving]` with raw pointers
8503 * Unsafe functions can no longer be coerced to closures.
8504 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8505 * The `#[simd]` attribute is now behind a feature gate.
8506 * Visibility is no longer allowed on `extern crate` statements, and
8507 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8508 * Trailing commas are now allowed in argument lists and tuple patterns.
8509 * The `do` keyword has been removed, it is now a reserved keyword.
8510 * Default type parameters have been implemented, but are feature gated.
8511 * Borrowed variables through captures in closures are now considered soundly.
8512 * `extern mod` is now `extern crate`
8513 * The `Freeze` trait has been removed.
8514 * The `Share` trait has been added for types that can be shared among
8516 * Labels in macros are now hygienic.
8517 * Expression/statement macro invocations can be delimited with `{}` now.
8518 * Treatment of types allowed in `static mut` locations has been tweaked.
8519 * The `*` and `.` operators are now overloadable through the `Deref` and
8521 * `~Trait` and `proc` no longer have `Send` bounds by default.
8522 * Partial type hints are now supported with the `_` type marker.
8523 * An `Unsafe` type was introduced for interior mutability. It is now
8524 considered undefined to transmute from `&T` to `&mut T` without using the
8526 * The #[linkage] attribute was implemented for extern statics/functions.
8527 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8528 * `Pod` was renamed to `Copy`.
8531 * The `libextra` library has been removed. It has now been decomposed into
8532 component libraries with smaller and more focused nuggets of
8533 functionality. The full list of libraries can be found on the
8534 documentation index page.
8535 * std: `std::condition` has been removed. All I/O errors are now propagated
8536 through the `Result` type. In order to assist with error handling, a
8537 `try!` macro for unwrapping errors with an early return and a lint for
8538 unused results has been added. See #12039 for more information.
8539 * std: The `vec` module has been renamed to `slice`.
8540 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8541 This will become the only growable vector in the future.
8542 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8543 are now found at `std::io::BufferedReader` instead of
8544 `std::io::buffered::BufferedReader`.
8545 * std: `print` and `println` are no longer in the prelude, the `print!` and
8546 `println!` macros are intended to be used instead.
8547 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8548 attempts to statically prevent cycles.
8549 * std: The standard distribution is adopting the policy of pushing failure
8550 to the user rather than failing in libraries. Many functions (such as
8551 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8552 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8553 deriving mode: `#[deriving(Show)]`.
8554 * std: `ToStr` is now implemented for all types implementing `Show`.
8555 * std: The formatting trait methods now take `&self` instead of `&T`
8556 * std: The `invert()` method on iterators has been renamed to `rev()`
8557 * std: `std::num` has seen a reduction in the genericity of its traits,
8558 consolidating functionality into a few core traits.
8559 * std: Backtraces are now printed on task failure if the environment
8560 variable `RUST_BACKTRACE` is present.
8561 * std: Naming conventions for iterators have been standardized. More details
8562 can be found on the wiki's style guide.
8563 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8564 still implement the function.
8565 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8566 * std: `assert_approx_eq!` has been removed
8567 * std: The `e` and `E` formatting specifiers for floats have been added to
8568 print them in exponential notation.
8569 * std: The `Times` trait has been removed
8570 * std: Indications of variance and opting out of builtin bounds is done
8571 through marker types in `std::kinds::marker` now
8572 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8573 `#[deriving(Hash)]` is now possible.
8574 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8575 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8576 * std: `Chan::new` is now `channel()`.
8577 * std: A new synchronous channel type has been implemented.
8578 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8579 * std: `hashmap` and `trie` have been moved to `libcollections`
8580 * std: `run` has been rolled into `io::process`
8581 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8582 * std: The equality and comparison traits have seen some reorganization.
8583 * std: `rand` has moved to `librand`.
8584 * std: `to_{lower,upper}case` has been implemented for `char`.
8585 * std: Logging has been moved to `liblog`.
8586 * collections: `HashMap` has been rewritten for higher performance and less
8588 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8589 it can be booted manually. The runtime guide has more information and
8591 * native: All I/O functionality except signals has been implemented.
8592 * green: Task spawning with `libgreen` has been optimized with stack caching
8593 and various trimming of code.
8594 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8595 * sync: The `extra::sync` module has been updated to modern rust (and moved
8596 to the `sync` library), tweaking and improving various interfaces while
8597 dropping redundant functionality.
8598 * sync: A new `Barrier` type has been added to the `sync` library.
8599 * sync: An efficient mutex for native and green tasks has been implemented.
8600 * serialize: The `base64` module has seen some improvement. It treats
8601 newlines better, has non-string error values, and has seen general
8603 * fourcc: A `fourcc!` macro was introduced
8604 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8605 hexadecimal literal.
8608 * `rustpkg` has been deprecated and removed from the main repository. Its
8609 replacement, `cargo`, is under development.
8610 * Nightly builds of rust are now available
8611 * The memory usage of rustc has been improved many times throughout this
8613 * The build process supports disabling rpath support for the rustc binary
8615 * Code generation has improved in some cases, giving more information to the
8616 LLVM optimization passes to enable more extensive optimizations.
8617 * Debuginfo compatibility with lldb on OSX has been restored.
8618 * The master branch is now gated on an android bot, making building for
8619 android much more reliable.
8620 * Output flags have been centralized into one `--emit` flag.
8621 * Crate type flags have been centralized into one `--crate-type` flag.
8622 * Codegen flags have been consolidated behind a `-C` flag.
8623 * Linking against outdated crates now has improved error messages.
8624 * Error messages with lifetimes will often suggest how to annotate the
8625 function to fix the error.
8626 * Many more types are documented in the standard library, and new guides
8628 * Many `rustdoc` improvements:
8629 * code blocks are syntax highlighted.
8630 * render standalone markdown files.
8631 * the --test flag tests all code blocks by default.
8632 * exported macros are displayed.
8633 * re-exported types have their documentation inlined at the location of the
8635 * search works across crates that have been rendered to the same output
8639 Version 0.9 (2014-01-09)
8640 ==========================
8642 * ~1800 changes, numerous bugfixes
8645 * The `float` type has been removed. Use `f32` or `f64` instead.
8646 * A new facility for enabling experimental features (feature gating) has
8647 been added, using the crate-level `#[feature(foo)]` attribute.
8648 * Managed boxes (@) are now behind a feature gate
8649 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8650 standard library's `Gc` or `Rc` types instead.
8651 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8652 * Jumping back to the top of a loop is now done with `continue` instead of
8654 * Strings can no longer be mutated through index assignment.
8655 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8656 hash delimiters, as in `r###"foo"###`.
8657 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8659 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8660 * `@fn`s have been removed.
8661 * `do` only works with procs in order to make it obvious what the cost
8663 * Single-element tuple-like structs can no longer be dereferenced to
8664 obtain the inner value. A more comprehensive solution for overloading
8665 the dereference operator will be provided in the future.
8666 * The `#[link(...)]` attribute has been replaced with
8667 `#[crate_id = "name#vers"]`.
8668 * Empty `impl`s must be terminated with empty braces and may not be
8669 terminated with a semicolon.
8670 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8671 no longer has any special meaning.
8672 * The old `fmt!` string formatting macro has been removed.
8673 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8674 `print!` and `println!`.
8675 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8676 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8677 `extern mod foo = "bar"` instead.
8678 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8679 * Macros can have attributes.
8680 * Macros can expand to items with attributes.
8681 * Macros can expand to multiple items.
8682 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8683 * Comments may be nested.
8684 * Values automatically coerce to trait objects they implement, without
8686 * Enum discriminants are no longer an entire word but as small as needed to
8687 contain all the variants. The `repr` attribute can be used to override
8688 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8689 `#[repr(C)]` to match C enums.
8690 * Non-string literals are not allowed in attributes (they never worked).
8691 * The FFI now supports variadic functions.
8692 * Octal numeric literals, as in `0o7777`.
8693 * The `concat!` syntax extension performs compile-time string concatenation.
8694 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8695 removed as Rust no longer uses segmented stacks.
8696 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8697 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8698 not `*`; ignoring remaining fields of a struct is also done with `..`,
8699 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8700 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8701 * `rustc` supports the "system" calling convention, which defaults to the
8702 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8704 * The `type_overflow` lint (default: warn) checks literals for overflow.
8705 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8706 * The `attribute_usage` lint (default: warn) warns about unknown
8708 * The `unknown_features` lint (default: warn) warns about unknown
8710 * The `dead_code` lint (default: warn) checks for dead code.
8711 * Rust libraries can be linked statically to one another
8712 * `#[link_args]` is behind the `link_args` feature gate.
8713 * Native libraries are now linked with `#[link(name = "foo")]`
8714 * Native libraries can be statically linked to a rust crate
8715 (`#[link(name = "foo", kind = "static")]`).
8716 * Native OS X frameworks are now officially supported
8717 (`#[link(name = "foo", kind = "framework")]`).
8718 * The `#[thread_local]` attribute creates thread-local (not task-local)
8719 variables. Currently behind the `thread_local` feature gate.
8720 * The `return` keyword may be used in closures.
8721 * Types that can be copied via a memcpy implement the `Pod` kind.
8722 * The `cfg` attribute can now be used on struct fields and enum variants.
8725 * std: The `option` and `result` API's have been overhauled to make them
8726 simpler, more consistent, and more composable.
8727 * std: The entire `std::io` module has been replaced with one that is
8728 more comprehensive and that properly interfaces with the underlying
8729 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8731 * std: `io::util` contains a number of useful implementations of
8732 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8733 `ZeroReader`, `TeeReader`.
8734 * std: The reference counted pointer type `extra::rc` moved into std.
8735 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8736 just a wrapper around it).
8737 * std: The `Either` type has been removed.
8738 * std: `fmt::Default` can be implemented for any type to provide default
8739 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8740 * std: The `rand` API continues to be tweaked.
8741 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8742 on failure in gdb, is now named `rust_fail`.
8743 * std: The `each_key` and `each_value` methods on `HashMap` have been
8744 replaced by the `keys` and `values` iterators.
8745 * std: Functions dealing with type size and alignment have moved from the
8746 `sys` module to the `mem` module.
8747 * std: The `path` module was written and API changed.
8748 * std: `str::from_utf8` has been changed to cast instead of allocate.
8749 * std: `starts_with` and `ends_with` methods added to vectors via the
8750 `ImmutableEqVector` trait, which is in the prelude.
8751 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8752 if the index is out of bounds.
8753 * std: Task failure no longer propagates between tasks, as the model was
8754 complex, expensive, and incompatible with thread-based tasks.
8755 * std: The `Any` type can be used for dynamic typing.
8756 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8758 * std: Methods that produce iterators generally do not have an `_iter`
8760 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8761 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8762 * std: `util::ignore` renamed to `prelude::drop`.
8763 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8765 * std: `vec::raw` has seen a lot of cleanup and API changes.
8766 * std: The standard library no longer includes any C++ code, and very
8767 minimal C, eliminating the dependency on libstdc++.
8768 * std: Runtime scheduling and I/O functionality has been factored out into
8769 extensible interfaces and is now implemented by two different crates:
8770 libnative, for native threading and I/O; and libgreen, for green threading
8771 and I/O. This paves the way for using the standard library in more limited
8772 embedded environments.
8773 * std: The `comm` module has been rewritten to be much faster, have a
8774 simpler, more consistent API, and to work for both native and green
8776 * std: All libuv dependencies have been moved into the rustuv crate.
8777 * native: New implementations of runtime scheduling on top of OS threads.
8778 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8780 * green: The green thread scheduler and message passing types are almost
8782 * extra: The `flatpipes` module had bitrotted and was removed.
8783 * extra: All crypto functions have been removed and Rust now has a policy of
8784 not reimplementing crypto in the standard library. In the future crypto
8785 will be provided by external crates with bindings to established libraries.
8786 * extra: `c_vec` has been modernized.
8787 * extra: The `sort` module has been removed. Use the `sort` method on
8791 * The `rust` and `rusti` commands have been removed, due to lack of
8793 * `rustdoc` was completely rewritten.
8794 * `rustdoc` can test code examples in documentation.
8795 * `rustpkg` can test packages with the argument, 'test'.
8796 * `rustpkg` supports arbitrary dependencies, including C libraries.
8797 * `rustc`'s support for generating debug info is improved again.
8798 * `rustc` has better error reporting for unbalanced delimiters.
8799 * `rustc`'s JIT support was removed due to bitrot.
8800 * Executables and static libraries can be built with LTO (-Z lto)
8801 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8805 Version 0.8 (2013-09-26)
8806 ============================
8808 * ~2200 changes, numerous bugfixes
8811 * The `for` loop syntax has changed to work with the `Iterator` trait.
8812 * At long last, unwinding works on Windows.
8813 * Default methods are ready for use.
8814 * Many trait inheritance bugs fixed.
8815 * Owned and borrowed trait objects work more reliably.
8816 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8817 * rustc can omit emission of code for the `debug!` macro if it is passed
8819 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8820 for foo.rs, then foo/mod.rs, and will generate an error when both are
8822 * Strings no longer contain trailing nulls. The new `std::c_str` module
8823 provides new mechanisms for converting to C strings.
8824 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8825 * The FFI has been overhauled such that foreign functions are called directly,
8826 instead of through a stack-switching wrapper.
8827 * Calling a foreign function must be done through a Rust function with the
8828 `#[fixed_stack_segment]` attribute.
8829 * The `externfn!` macro can be used to declare both a foreign function and
8830 a `#[fixed_stack_segment]` wrapper at once.
8831 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8832 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8833 * `priv` is disallowed everywhere except for struct fields and enum variants.
8834 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8835 * `ref` bindings in irrefutable patterns work correctly now.
8836 * `char` is now prevented from containing invalid code points.
8837 * Casting to `bool` is no longer allowed.
8838 * `\0` is now accepted as an escape in chars and strings.
8839 * `yield` is a reserved keyword.
8840 * `typeof` is a reserved keyword.
8841 * Crates may be imported by URL with `extern mod foo = "url";`.
8842 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8843 * Static vectors can be initialized with repeating elements,
8844 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8845 * Static structs can be initialized with functional record update,
8846 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8847 * `cfg!` can be used to conditionally execute code based on the crate
8848 configuration, similarly to `#[cfg(...)]`.
8849 * The `unnecessary_qualification` lint detects unneeded module
8850 prefixes (default: allow).
8851 * Arithmetic operations have been implemented on the SIMD types in
8852 `std::unstable::simd`.
8853 * Exchange allocation headers were removed, reducing memory usage.
8854 * `format!` implements a completely new, extensible, and higher-performance
8855 string formatting system. It will replace `fmt!`.
8856 * `print!` and `println!` write formatted strings (using the `format!`
8857 extension) to stdout.
8858 * `write!` and `writeln!` write formatted strings (using the `format!`
8859 extension) to the new Writers in `std::rt::io`.
8860 * The library section in which a function or static is placed may
8861 be specified with `#[link_section = "..."]`.
8862 * The `proto!` syntax extension for defining bounded message protocols
8864 * `macro_rules!` is hygienic for `let` declarations.
8865 * The `#[export_name]` attribute specifies the name of a symbol.
8866 * `unreachable!` can be used to indicate unreachable code, and fails
8870 * std: Transitioned to the new runtime, written in Rust.
8871 * std: Added an experimental I/O library, `rt::io`, based on the new
8873 * std: A new generic `range` function was added to the prelude, replacing
8874 `uint::range` and friends.
8875 * std: `range_rev` no longer exists. Since range is an iterator it can be
8876 reversed with `range(lo, hi).invert()`.
8877 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8878 renamed to `unwrap_or`.
8879 * std: The `iterator` module was renamed to `iter`.
8880 * std: Integral types now support the `checked_add`, `checked_sub`, and
8881 `checked_mul` operations for detecting overflow.
8882 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8884 * std: Methods are standardizing on conventions for casting methods:
8885 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8887 * std: The `CString` type in `c_str` provides new ways to convert to and
8889 * std: `DoubleEndedIterator` can yield elements in two directions.
8890 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8892 * std: `str::from_bytes` renamed to `str::from_utf8`.
8893 * std: `pop_opt` and `shift_opt` methods added to vectors.
8894 * std: The task-local data interface no longer uses @, and keys are
8895 no longer function pointers.
8896 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8897 * std: Added `SharedPort` to `comm`.
8898 * std: `Eq` has a default method for `ne`; only `eq` is required
8900 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8901 is required in implementations.
8902 * std: `is_utf8` performance is improved, impacting many string functions.
8903 * std: `os::MemoryMap` provides cross-platform mmap.
8904 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8905 are not 'in-bounds' are considered undefined.
8906 * std: Many freestanding functions in `vec` removed in favor of methods.
8907 * std: Many freestanding functions on scalar types removed in favor of
8909 * std: Many options to task builders were removed since they don't make
8910 sense in the new scheduler design.
8911 * std: More containers implement `FromIterator` so can be created by the
8913 * std: More complete atomic types in `unstable::atomics`.
8914 * std: `comm::PortSet` removed.
8915 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8916 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8917 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8918 default implementations.
8919 * std: Various `from_str` functions were removed in favor of a generic
8920 `from_str` which is available in the prelude.
8921 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8922 * extra: `dlist`, the doubly-linked list was modernized.
8923 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8924 * extra: Added `glob` module, replacing `std::os::glob`.
8925 * extra: `rope` was removed.
8926 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8927 * extra: `net`, and `timer` were removed. The experimental replacements
8928 are `std::rt::io::net` and `std::rt::io::timer`.
8929 * extra: Iterators implemented for `SmallIntMap`.
8930 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8931 * extra: `SmallIntSet` removed. Use `BitvSet`.
8932 * extra: Performance of JSON parsing greatly improved.
8933 * extra: `semver` updated to SemVer 2.0.0.
8934 * extra: `term` handles more terminals correctly.
8935 * extra: `dbg` module removed.
8936 * extra: `par` module removed.
8937 * extra: `future` was cleaned up, with some method renames.
8938 * extra: Most free functions in `getopts` were converted to methods.
8941 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8942 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8943 similarly to gcc's `--march` flag.
8944 * rustc's performance compiling small crates is much better.
8945 * rustpkg has received many improvements.
8946 * rustpkg supports git tags as package IDs.
8947 * rustpkg builds into target-specific directories so it can be used for
8949 * The number of concurrent test tasks is controlled by the environment
8950 variable RUST_TEST_TASKS.
8951 * The test harness can now report metrics for benchmarks.
8952 * All tools have man pages.
8953 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8954 * The runtime uses jemalloc for allocations.
8955 * Segmented stacks are temporarily disabled as part of the transition to
8956 the new runtime. Stack overflows are possible!
8957 * A new documentation backend, rustdoc_ng, is available for use. It is
8958 still invoked through the normal `rustdoc` command.
8961 Version 0.7 (2013-07-03)
8962 =======================
8964 * ~2000 changes, numerous bugfixes
8967 * `impl`s no longer accept a visibility qualifier. Put them on methods
8969 * The borrow checker has been rewritten with flow-sensitivity, fixing
8970 many bugs and inconveniences.
8971 * The `self` parameter no longer implicitly means `&'self self`,
8972 and can be explicitly marked with a lifetime.
8973 * Overloadable compound operators (`+=`, etc.) have been temporarily
8974 removed due to bugs.
8975 * The `for` loop protocol now requires `for`-iterators to return `bool`
8976 so they compose better.
8977 * The `Durable` trait is replaced with the `'static` bounds.
8978 * Trait default methods work more often.
8979 * Structs with the `#[packed]` attribute have byte alignment and
8980 no padding between fields.
8981 * Type parameters bound by `Copy` must now be copied explicitly with
8983 * It is now illegal to move out of a dereferenced unsafe pointer.
8984 * `Option<~T>` is now represented as a nullable pointer.
8985 * `@mut` does dynamic borrow checks correctly.
8986 * The `main` function is only detected at the topmost level of the crate.
8987 The `#[main]` attribute is still valid anywhere.
8988 * Struct fields may no longer be mutable. Use inherited mutability.
8989 * The `#[no_send]` attribute makes a type that would otherwise be
8991 * The `#[no_freeze]` attribute makes a type that would otherwise be
8993 * Unbounded recursion will abort the process after reaching the limit
8994 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8995 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8996 are never implicitly copyable.
8997 * `#[static_assert]` makes compile-time assertions about static bools.
8998 * At long last, 'argument modes' no longer exist.
8999 * The rarely used `use mod` statement no longer exists.
9002 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9004 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9005 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9007 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9008 and unsuffixed integer literals.
9011 * The `core` crate was renamed to `std`.
9012 * The `std` crate was renamed to `extra`.
9013 * More and improved documentation.
9014 * std: `iterator` module for external iterator objects.
9015 * Many old-style (internal, higher-order function) iterators replaced by
9016 implementations of `Iterator`.
9017 * std: Many old internal vector and string iterators,
9018 incl. `any`, `all`. removed.
9019 * std: The `finalize` method of `Drop` renamed to `drop`.
9020 * std: The `drop` method now takes `&mut self` instead of `&self`.
9021 * std: The prelude no longer re-exports any modules, only types and traits.
9022 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9023 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9024 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9025 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9026 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9027 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9028 * std: Many types implement `Clone`.
9029 * std: `path` type renamed to `Path`.
9030 * std: `mut` module and `Mut` type removed.
9031 * std: Many standalone functions removed in favor of methods and iterators
9032 in `vec`, `str`. In the future methods will also work as functions.
9033 * std: `reinterpret_cast` removed. Use `transmute`.
9034 * std: ascii string handling in `std::ascii`.
9035 * std: `Rand` is implemented for ~/@.
9036 * std: `run` module for spawning processes overhauled.
9037 * std: Various atomic types added to `unstable::atomic`.
9038 * std: Various types implement `Zero`.
9039 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9040 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9041 * std: Added `os::mkdir_recursive`.
9042 * std: Added `os::glob` function performs filesystems globs.
9043 * std: `FuzzyEq` renamed to `ApproxEq`.
9044 * std: `Map` now defines `pop` and `swap` methods.
9045 * std: `Cell` constructors converted to static methods.
9046 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9047 * extra: `flate` module moved from `std` to `extra`.
9048 * extra: `fileinput` module for iterating over a series of files.
9049 * extra: `Complex` number type and `complex` module.
9050 * extra: `Rational` number type and `rational` module.
9051 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9052 * extra: `term` uses terminfo now, is more correct.
9053 * extra: `arc` functions converted to methods.
9054 * extra: Implementation of fixed output size variations of SHA-2.
9057 * `unused_variables` lint mode for unused variables (default: warn).
9058 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9060 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9062 * `dead_assignment` lint mode for unread variables (default: warn).
9063 * `unnecessary_allocation` lint mode detects some heap allocations that are
9064 immediately borrowed so could be written without allocating (default: warn).
9065 * `missing_doc` lint mode (default: allow).
9066 * `unreachable_code` lint mode (default: warn).
9067 * The `rusti` command has been rewritten and a number of bugs addressed.
9068 * rustc outputs in color on more terminals.
9069 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9070 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9071 * Compiling with `-g` will make the binary record information about
9072 dynamic borrowcheck failures for debugging.
9073 * rustdoc has a nicer stylesheet.
9074 * Various improvements to rustdoc.
9075 * Improvements to rustpkg (see the detailed release notes).
9078 Version 0.6 (2013-04-03)
9079 ========================
9081 * ~2100 changes, numerous bugfixes
9084 * The self type parameter in traits is now spelled `Self`
9085 * The `self` parameter in trait and impl methods must now be explicitly
9086 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9087 * Static methods no longer require the `static` keyword and instead
9088 are distinguished by the lack of a `self` parameter
9089 * Replaced the `Durable` trait with the `'static` lifetime
9090 * The old closure type syntax with the trailing sigil has been
9091 removed in favor of the more consistent leading sigil
9092 * `super` is a keyword, and may be prefixed to paths
9093 * Trait bounds are separated with `+` instead of whitespace
9094 * Traits are implemented with `impl Trait for Type`
9095 instead of `impl Type: Trait`
9096 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9097 * The `export` keyword has finally been removed
9098 * The `move` keyword has been removed (see "Semantic changes")
9099 * The interior mutability qualifier on vectors, `[mut T]`, has been
9100 removed. Use `&mut [T]`, etc.
9101 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9102 * `fail` is no longer a keyword. Use `fail!()`
9103 * `assert` is no longer a keyword. Use `assert!()`
9104 * `log` is no longer a keyword. use `debug!`, etc.
9105 * 1-tuples may be represented as `(T,)`
9106 * Struct fields may no longer be `mut`. Use inherited mutability,
9107 `@mut T`, `core::mut` or `core::cell`
9108 * `extern mod { ... }` is no longer valid syntax for foreign
9109 function modules. Use extern blocks: `extern { ... }`
9110 * Newtype enums removed. Use tuple-structs.
9111 * Trait implementations no longer support visibility modifiers
9112 * Pattern matching over vectors improved and expanded
9113 * `const` renamed to `static` to correspond to lifetime name,
9114 and make room for future `static mut` unsafe mutable globals.
9115 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9116 * `Clone` implementations can be automatically generated with
9117 `#[deriving(Clone)]`
9118 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9119 instead of `foo as Bar`.
9120 * Fixed length vector types are now written as `[int, .. 3]`
9121 instead of `[int * 3]`.
9122 * Fixed length vector types can express the length as a constant
9123 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9126 * Types with owned pointers or custom destructors move by default,
9127 eliminating the `move` keyword
9128 * All foreign functions are considered unsafe
9129 * &mut is now unaliasable
9130 * Writes to borrowed @mut pointers are prevented dynamically
9132 * The name of the main function can be customized using #[main]
9133 * The default type of an inferred closure is &fn instead of @fn
9134 * `use` statements may no longer be "chained" - they cannot import
9135 identifiers imported by previous `use` statements
9136 * `use` statements are crate relative, importing from the "top"
9137 of the crate by default. Paths may be prefixed with `super::`
9138 or `self::` to change the search behavior.
9139 * Method visibility is inherited from the implementation declaration
9140 * Structural records have been removed
9141 * Many more types can be used in static items, including enums
9142 'static-lifetime pointers and vectors
9143 * Pattern matching over vectors improved and expanded
9144 * Typechecking of closure types has been overhauled to
9145 improve inference and eliminate unsoundness
9146 * Macros leave scope at the end of modules, unless that module is
9147 tagged with #[macro_escape]
9150 * Added big integers to `std::bigint`
9151 * Removed `core::oldcomm` module
9152 * Added pipe-based `core::comm` module
9153 * Numeric traits have been reorganized under `core::num`
9154 * `vec::slice` finally returns a slice
9155 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9156 * Containers reorganized around traits in `core::container`
9157 * `core::dvec` removed, `~[T]` is a drop-in replacement
9158 * `core::send_map` renamed to `core::hashmap`
9159 * `std::map` removed; replaced with `core::hashmap`
9160 * `std::treemap` reimplemented as an owned balanced tree
9161 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9162 * `core::trie` added as a fast ordered map for integer keys
9163 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9164 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9165 overload the comparison operators, whereas `TotalOrd` is used
9166 by certain container types
9169 * Replaced the 'cargo' package manager with 'rustpkg'
9170 * Added all-purpose 'rust' tool
9171 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9172 * rustc now *attempts* to offer spelling suggestions
9173 * Improved support for ARM and Android
9174 * Preliminary MIPS backend
9175 * Improved foreign function ABI implementation for x86, x86_64
9176 * Various memory usage improvements
9177 * Rust code may be embedded in foreign code under limited circumstances
9178 * Inline assembler supported by new asm!() syntax extension.
9181 Version 0.5 (2012-12-21)
9182 ===========================
9184 * ~900 changes, numerous bugfixes
9187 * Removed `<-` move operator
9188 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9189 * Removed old fixed length vector syntax - `[T]/N`
9190 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9191 * Macros may now expand to items and statements
9192 * `a.b()` is always parsed as a method call, never as a field projection
9193 * `Eq` and `IterBytes` implementations can be automatically generated
9194 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9195 * Removed the special crate language for `.rc` files
9196 * Function arguments may consist of any irrefutable pattern
9199 * `&` and `~` pointers may point to objects
9200 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9201 * Enum variants may be structs
9202 * Destructors can be added to all nominal types with the Drop trait
9203 * Structs and nullary enum variants may be constants
9204 * Values that cannot be implicitly copied are now automatically moved
9205 without writing `move` explicitly
9206 * `&T` may now be coerced to `*T`
9207 * Coercions happen in `let` statements as well as function calls
9208 * `use` statements now take crate-relative paths
9209 * The module and type namespaces have been merged so that static
9210 method names can be resolved under the trait in which they are
9213 * Improved support for language features
9214 * Trait inheritance works in many scenarios
9215 * More support for explicit self arguments in methods - `self`, `&self`
9216 `@self`, and `~self` all generally work as expected
9217 * Static methods work in more situations
9218 * Experimental: Traits may declare default methods for the implementations
9222 * New condition handling system in `core::condition`
9223 * Timsort added to `std::sort`
9224 * New priority queue, `std::priority_queue`
9225 * Pipes for serializable types, `std::flatpipes'
9226 * Serialization overhauled to be trait-based
9227 * Expanded `getopts` definitions
9228 * Moved futures to `std`
9229 * More functions are pure now
9230 * `core::comm` renamed to `oldcomm`. Still deprecated
9231 * `rustdoc` and `cargo` are libraries now
9234 * Added a preliminary REPL, `rusti`
9235 * License changed from MIT to dual MIT/APL2
9238 Version 0.4 (2012-10-15)
9239 ==========================
9241 * ~2000 changes, numerous bugfixes
9244 * All keywords are now strict and may not be used as identifiers anywhere
9245 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9246 'of', 'with', 'to', 'class'.
9247 * Classes are replaced with simpler structs
9248 * Explicit method self types
9249 * `ret` became `return` and `alt` became `match`
9250 * `import` is now `use`; `use is now `extern mod`
9251 * `extern mod { ... }` is now `extern { ... }`
9252 * `use mod` is the recommended way to import modules
9253 * `pub` and `priv` replace deprecated export lists
9254 * The syntax of `match` pattern arms now uses fat arrow (=>)
9255 * `main` no longer accepts an args vector; use `os::args` instead
9258 * Trait implementations are now coherent, ala Haskell typeclasses
9259 * Trait methods may be static
9260 * Argument modes are deprecated
9261 * Borrowed pointers are much more mature and recommended for use
9262 * Strings and vectors in the static region are stored in constant memory
9263 * Typestate was removed
9264 * Resolution rewritten to be more reliable
9265 * Support for 'dual-mode' data structures (freezing and thawing)
9268 * Most binary operators can now be overloaded via the traits in
9270 * `std::net::url` for representing URLs
9271 * Sendable hash maps in `core::send_map`
9272 * `core::task' gained a (currently unsafe) task-local storage API
9275 * An efficient new intertask communication primitive called the pipe,
9276 along with a number of higher-level channel types, in `core::pipes`
9277 * `std::arc`, an atomically reference counted, immutable, shared memory
9279 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9280 * Futures are now based on pipes and sendable
9281 * More robust linked task failure
9282 * Improved task builder API
9285 * Improved error reporting
9286 * Preliminary JIT support
9287 * Preliminary work on precise GC
9288 * Extensive architectural improvements to rustc
9289 * Begun a transition away from buggy C++-based reflection (shape) code to
9290 Rust-based (visitor) code
9291 * All hash functions and tables converted to secure, randomized SipHash
9294 Version 0.3 (2012-07-12)
9295 ========================
9297 * ~1900 changes, numerous bugfixes
9299 * New coding conveniences
9300 * Integer-literal suffix inference
9301 * Per-item control over warnings, errors
9302 * #[cfg(windows)] and #[cfg(unix)] attributes
9303 * Documentation comments
9304 * More compact closure syntax
9305 * 'do' expressions for treating higher-order functions as
9307 * *-patterns (wildcard extended to all constructor fields)
9310 * Name resolution pass and exhaustiveness checker rewritten
9311 * Region pointers and borrow checking supersede alias
9313 * Init-ness checking is now provided by a region-based liveness
9314 pass instead of the typestate pass; same for last-use analysis
9315 * Extensive work on region pointers
9317 * Experimental new language features
9318 * Slices and fixed-size, interior-allocated vectors
9319 * #!-comments for lang versioning, shell execution
9320 * Destructors and iface implementation for classes;
9321 type-parameterized classes and class methods
9322 * 'const' type kind for types that can be used to implement
9323 shared-memory concurrency patterns
9327 * Removal of various obsolete features
9328 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9329 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9331 * Constructs: do-while loops ('do' repurposed), fn binding,
9332 resources (replaced by destructors)
9334 * Compiler reorganization
9335 * Syntax-layer of compiler split into separate crate
9336 * Clang (from LLVM project) integrated into build
9337 * Typechecker split into sub-modules
9340 * New time functions
9341 * Extension methods for many built-in types
9342 * Arc: atomic-refcount read-only / exclusive-use shared cells
9343 * Par: parallel map and search routines
9344 * Extensive work on libuv interface
9345 * Much vector code moved to libraries
9346 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9347 #include, #include_str, #include_bin
9350 * Cargo automatically resolves dependencies
9353 Version 0.2 (2012-03-29)
9354 =========================
9356 * >1500 changes, numerous bugfixes
9358 * New docs and doc tooling
9360 * New port: FreeBSD x86_64
9362 * Compilation model enhancements
9363 * Generics now specialized, multiply instantiated
9364 * Functions now inlined across separate crates
9366 * Scheduling, stack and threading fixes
9367 * Noticeably improved message-passing performance
9368 * Explicit schedulers
9372 * Experimental new language features
9373 * Operator overloading
9377 * Various language extensions
9378 * C-callback function types: 'crust fn ...'
9379 * Infinite-loop construct: 'loop { ... }'
9380 * Shorten 'mutable' to 'mut'
9381 * Required mutable-local qualifier: 'let mut ...'
9382 * Basic glob-exporting: 'export foo::*;'
9383 * Alt now exhaustive, 'alt check' for runtime-checked
9384 * Block-function form of 'for' loop, with 'break' and 'ret'.
9387 * AST quasi-quote syntax extension
9388 * Revived libuv interface
9389 * New modules: core::{future, iter}, std::arena
9390 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9391 * Extensive cleanup, regularization in libstd, libcore
9394 Version 0.1 (2012-01-20)
9395 ===============================
9397 * Most language features work, including:
9398 * Unique pointers, unique closures, move semantics
9399 * Interface-constrained generics
9400 * Static interface dispatch
9402 * Multithread task scheduling
9403 * Typestate predicates
9404 * Failure unwinding, destructors
9405 * Pattern matching and destructuring assignment
9406 * Lightweight block-lambda syntax
9407 * Preliminary macro-by-example
9409 * Compiler works with the following configurations:
9410 * Linux: x86 and x86_64 hosts and targets
9411 * macOS: x86 and x86_64 hosts and targets
9412 * Windows: x86 hosts and targets
9414 * Cross compilation / multi-target configuration supported.
9416 * Preliminary API-documentation and package-management tools included.
9420 * Documentation is incomplete.
9422 * Performance is below intended target.
9424 * Standard library APIs are subject to extensive change, reorganization.
9426 * Language-level versioning is not yet operational - future code will