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] This tells `rustc` whether to link
13 its own C runtime and libraries or to rely on a external linker to find them. (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 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]
64 - [You can now use `rustup install <major>.<minor>` to specify installing the
65 latest available patch of the specified minor version of the toolchain.][76107] E.g.
66 `rustup install 1.45` would install `1.45.2`, and `1.46` would install `1.46.0`.
70 - [`const fn`s are now implicitly promoted to `const`.][75502] Meaning that it
71 will only warn if your code fails `const` evaluation, and not produce an error.
72 - [Associated type bindings on trait objects are now verified to meet the bounds
73 declared on the trait when checking that they implement the trait.][27675]
74 - [When trait bounds on associated types or opaque types are ambiguous, the
75 compiler no longer makes an arbitrary choice on which bound to use.][54121]
76 - [Fixed recursive nonterminals not being expanded in macros during
77 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
78 correctly handling recursive nonterminal tokens.
79 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
80 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
81 in places where they have no effect.][73461]
82 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
83 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
84 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
85 disallow zero-initialization.][71274]
89 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
90 You can continue building with `make` by setting `ninja=false` in
93 [27675]: https://github.com/rust-lang/rust/issues/27675/
94 [54121]: https://github.com/rust-lang/rust/issues/54121/
95 [71274]: https://github.com/rust-lang/rust/pull/71274/
96 [77386]: https://github.com/rust-lang/rust/pull/77386/
97 [77153]: https://github.com/rust-lang/rust/pull/77153/
98 [77055]: https://github.com/rust-lang/rust/pull/77055/
99 [76275]: https://github.com/rust-lang/rust/pull/76275/
100 [76310]: https://github.com/rust-lang/rust/pull/76310/
101 [76420]: https://github.com/rust-lang/rust/pull/76420/
102 [76107]: https://github.com/rust-lang/rust/pull/76107/
103 [76158]: https://github.com/rust-lang/rust/pull/76158/
104 [75857]: https://github.com/rust-lang/rust/pull/75857/
105 [75585]: https://github.com/rust-lang/rust/pull/75585/
106 [75740]: https://github.com/rust-lang/rust/pull/75740/
107 [75502]: https://github.com/rust-lang/rust/pull/75502/
108 [74880]: https://github.com/rust-lang/rust/pull/74880/
109 [74922]: https://github.com/rust-lang/rust/pull/74922/
110 [74430]: https://github.com/rust-lang/rust/pull/74430/
111 [74194]: https://github.com/rust-lang/rust/pull/74194/
112 [73461]: https://github.com/rust-lang/rust/pull/73461/
113 [73166]: https://github.com/rust-lang/rust/pull/73166/
114 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
115 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
116 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
117 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
118 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
119 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
120 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
121 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
122 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
123 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
124 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
125 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
126 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
127 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
130 Version 1.47.0 (2020-10-08)
131 ==========================
135 - [Closures will now warn when not used.][74869]
139 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
140 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
142 - [Upgraded to LLVM 11.][73526]
143 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
144 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
145 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
147 \* Refer to Rust's [platform support page][forge-platform-support] for more
148 information on Rust's tiered platform support.
152 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
153 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
154 those of length less than 33.][74060]
155 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
156 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
157 `PartialEq`, and `PartialOrd`.][73583]
162 - [`Range::is_empty`]
163 - [`RangeInclusive::is_empty`]
164 - [`Result::as_deref`]
165 - [`Result::as_deref_mut`]
167 - [`pointer::offset_from`]
171 The following previously stable APIs have now been made const.
173 - [The `new` method for all `NonZero` integers.][73858]
174 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
175 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
176 methods for all integers.][73858]
177 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
178 signed integers.][73858]
179 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
180 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
181 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
182 `is_ascii_control` methods for `char` and `u8`.][73858]
186 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
187 You can override this by setting the following in your `Cargo.toml`.
189 [profile.release.build-override]
192 - [`cargo-help` will now display man pages for commands rather just the
193 `--help` text.][cargo/8456]
194 - [`cargo-metadata` now emits a `test` field indicating if a target has
195 tests enabled.][cargo/8478]
196 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
197 - [`cargo-publish` will now use an alternative registry by default if it's the
198 only registry specified in `package.publish`.][cargo/8571]
202 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
203 type based search.][75366]
204 - [Added the Ayu theme to rustdoc.][71237]
208 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
209 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
210 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
211 help to preserve more span information.][73084] These changes may cause
212 compiliation errors if your macro was unhygenic or didn't correctly handle
214 - [Moved support for the CloudABI target to tier 3.][75568]
215 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
216 - [Added the `rustc-docs` component.][75560] This allows you to install
217 and read the documentation for the compiler internal APIs. (Currently only
218 available for `x86_64-unknown-linux-gnu`.)
222 - [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.
224 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
225 [75048]: https://github.com/rust-lang/rust/pull/75048/
226 [74163]: https://github.com/rust-lang/rust/pull/74163/
227 [71237]: https://github.com/rust-lang/rust/pull/71237/
228 [74869]: https://github.com/rust-lang/rust/pull/74869/
229 [73858]: https://github.com/rust-lang/rust/pull/73858/
230 [75716]: https://github.com/rust-lang/rust/pull/75716/
231 [75908]: https://github.com/rust-lang/rust/pull/75908/
232 [75516]: https://github.com/rust-lang/rust/pull/75516/
233 [75560]: https://github.com/rust-lang/rust/pull/75560/
234 [75568]: https://github.com/rust-lang/rust/pull/75568/
235 [75366]: https://github.com/rust-lang/rust/pull/75366/
236 [75204]: https://github.com/rust-lang/rust/pull/75204/
237 [74650]: https://github.com/rust-lang/rust/pull/74650/
238 [74419]: https://github.com/rust-lang/rust/pull/74419/
239 [73964]: https://github.com/rust-lang/rust/pull/73964/
240 [74021]: https://github.com/rust-lang/rust/pull/74021/
241 [74060]: https://github.com/rust-lang/rust/pull/74060/
242 [73893]: https://github.com/rust-lang/rust/pull/73893/
243 [73526]: https://github.com/rust-lang/rust/pull/73526/
244 [73583]: https://github.com/rust-lang/rust/pull/73583/
245 [73084]: https://github.com/rust-lang/rust/pull/73084/
246 [73197]: https://github.com/rust-lang/rust/pull/73197/
247 [72488]: https://github.com/rust-lang/rust/pull/72488/
248 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
249 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
250 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
251 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
252 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
253 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
254 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
255 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
256 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
257 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
258 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
259 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
260 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
261 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
262 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
265 Version 1.46.0 (2020-08-27)
266 ==========================
270 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
271 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
272 const functions.][73862]
273 - [The `#[track_caller]` attribute can now be added to functions to use the
274 function's caller's location information for panic messages.][72445]
275 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
276 `x.0.0` over `(x.0).0`.
277 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
278 You currently can't use `mem::transmute` in constant functions.
282 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
283 - [Enabled static "Position Independent Executables" by default
284 for `x86_64-unknown-linux-musl`.][70740]
288 - [`mem::forget` is now a `const fn`.][73887]
289 - [`String` now implements `From<char>`.][73466]
290 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
291 integer types.][73032]
292 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
293 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
294 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
295 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
296 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
297 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
302 - [`vec::Drain::as_slice`]
306 Added a number of new environment variables that are now available when
307 compiling your crate.
309 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
310 the specific binary being compiled and the name of the crate.
311 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
312 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
316 - [The target configuration option `abi_blacklist` has been renamed
317 to `unsupported_abis`.][74150] The old name will still continue to work.
318 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
319 This was previously accepted but will become a hard error in a future release.
320 - [Rustc will fail to compile if you have a struct with
321 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
323 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
324 ensure that spans have the correct information, and may cause breakage if you
325 were relying on receiving spans with dummy information.
326 - [The InnoSetup installer for Windows is no longer available.][72569] This was
327 a legacy installer that was replaced by a MSI installer a few years ago but
328 was still being built.
329 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
330 - [Rustc will no longer accept overlapping trait implementations that only
331 differ in how the lifetime was bound.][72493]
332 - [Rustc now correctly relates the lifetime of an existential associated
333 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
334 you to pass a shorter lifetime than expected.
335 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
336 The library will need to be installed for `rustc` to work, even though we
337 expect it to be already available on most systems.
338 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
340 - [Pretty printing of some tokens in procedural macros changed.][75453] The
341 exact output returned by rustc's pretty printing is an unstable
342 implementation detail: we recommend any macro relying on it to switch to a
343 more robust parsing system.
345 [75453]: https://github.com/rust-lang/rust/issues/75453/
346 [74820]: https://github.com/rust-lang/rust/issues/74820/
347 [74420]: https://github.com/rust-lang/rust/issues/74420/
348 [74109]: https://github.com/rust-lang/rust/pull/74109/
349 [74150]: https://github.com/rust-lang/rust/pull/74150/
350 [73862]: https://github.com/rust-lang/rust/pull/73862/
351 [73887]: https://github.com/rust-lang/rust/pull/73887/
352 [73466]: https://github.com/rust-lang/rust/pull/73466/
353 [73516]: https://github.com/rust-lang/rust/pull/73516/
354 [73293]: https://github.com/rust-lang/rust/pull/73293/
355 [73007]: https://github.com/rust-lang/rust/pull/73007/
356 [73032]: https://github.com/rust-lang/rust/pull/73032/
357 [72920]: https://github.com/rust-lang/rust/pull/72920/
358 [72569]: https://github.com/rust-lang/rust/pull/72569/
359 [72583]: https://github.com/rust-lang/rust/pull/72583/
360 [72584]: https://github.com/rust-lang/rust/pull/72584/
361 [72717]: https://github.com/rust-lang/rust/pull/72717/
362 [72437]: https://github.com/rust-lang/rust/pull/72437/
363 [72445]: https://github.com/rust-lang/rust/pull/72445/
364 [72486]: https://github.com/rust-lang/rust/pull/72486/
365 [72493]: https://github.com/rust-lang/rust/pull/72493/
366 [72331]: https://github.com/rust-lang/rust/pull/72331/
367 [71896]: https://github.com/rust-lang/rust/pull/71896/
368 [71660]: https://github.com/rust-lang/rust/pull/71660/
369 [71322]: https://github.com/rust-lang/rust/pull/71322/
370 [70740]: https://github.com/rust-lang/rust/pull/70740/
371 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
372 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
373 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
374 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
375 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
378 Version 1.45.2 (2020-08-03)
379 ==========================
381 * [Fix bindings in tuple struct patterns][74954]
382 * [Fix track_caller integration with trait objects][74784]
384 [74954]: https://github.com/rust-lang/rust/issues/74954
385 [74784]: https://github.com/rust-lang/rust/issues/74784
388 Version 1.45.1 (2020-07-30)
389 ==========================
391 * [Fix const propagation with references.][73613]
392 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
393 * [Avoid spurious implicit region bound.][74509]
394 * [Install clippy on x.py install][74457]
396 [73613]: https://github.com/rust-lang/rust/pull/73613
397 [73078]: https://github.com/rust-lang/rust/issues/73078
398 [74509]: https://github.com/rust-lang/rust/pull/74509
399 [74457]: https://github.com/rust-lang/rust/pull/74457
402 Version 1.45.0 (2020-07-16)
403 ==========================
407 - [Out of range float to int conversions using `as` has been defined as a saturating
408 conversion.][71269] This was previously undefined behaviour, but you can use the
409 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
410 may be desirable in rare performance sensitive situations.
411 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
413 - [Function like procedural macros can now be used in expression, pattern, and statement
414 positions.][68717] This means you can now use a function-like procedural macro
415 anywhere you can use a declarative (`macro_rules!`) macro.
419 - [You can now override individual target features through the `target-feature`
420 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
421 equivalent to `-C target-feature=+avx2,+fma`.
422 - [Added the `force-unwind-tables` flag.][69984] This option allows
423 rustc to always generate unwind tables regardless of panic strategy.
424 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
425 to include LLVM bitcode into generated `rlib`s (this is on by default).
426 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
427 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
428 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
430 \* Refer to Rust's [platform support page][forge-platform-support] for more
431 information on Rust's tiered platform support.
436 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
438 - [`proc_macro::TokenStream` now implements `Default`.][72234]
439 - [You can now use `char` with
440 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
441 a range of codepoints.][72413] E.g.
442 you can now write the following;
444 for ch in 'a'..='z' {
448 // Prints "abcdefghijklmnopqrstuvwxyz"
450 - [`OsString` now implements `FromStr`.][71662]
451 - [The `saturating_neg` method has been added to all signed integer primitive
452 types, and the `saturating_abs` method has been added for all integer
453 primitive types.][71886]
454 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
455 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
457 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
458 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
459 integer types.][69813]
460 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
461 integer types.][72324]
462 - [The `fetch_update` method has been added to all atomic integer types.][71843]
467 - [`BTreeMap::remove_entry`]
469 - [`rc::Weak::as_ptr`]
470 - [`rc::Weak::from_raw`]
471 - [`rc::Weak::into_raw`]
472 - [`str::strip_prefix`]
473 - [`str::strip_suffix`]
474 - [`sync::Weak::as_ptr`]
475 - [`sync::Weak::from_raw`]
476 - [`sync::Weak::into_raw`]
477 - [`char::UNICODE_VERSION`]
478 - [`Span::resolved_at`]
479 - [`Span::located_at`]
480 - [`Span::mixed_site`]
481 - [`unix::process::CommandExt::arg0`]
486 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
491 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
492 `~~outdated information~~` becomes "~~outdated information~~".
493 - [Added an emoji to Rustdoc's deprecated API message.][72014]
497 - [Trying to self initialize a static value (that is creating a value using
498 itself) is unsound and now causes a compile error.][71140]
499 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
500 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
501 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
502 previously undocumented and not intended for public use. Rustdoc still provides
503 a non-zero exit code on errors.
504 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
505 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
506 flags while cargo is adding `embed-bitcode` itself. The recommended way to
507 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
508 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
512 - [Make clippy a git subtree instead of a git submodule][70655]
513 - [Unify the undo log of all snapshot types][69464]
515 [71848]: https://github.com/rust-lang/rust/issues/71848/
516 [73420]: https://github.com/rust-lang/rust/issues/73420/
517 [72324]: https://github.com/rust-lang/rust/pull/72324/
518 [71843]: https://github.com/rust-lang/rust/pull/71843/
519 [71886]: https://github.com/rust-lang/rust/pull/71886/
520 [72234]: https://github.com/rust-lang/rust/pull/72234/
521 [72239]: https://github.com/rust-lang/rust/pull/72239/
522 [72397]: https://github.com/rust-lang/rust/pull/72397/
523 [72413]: https://github.com/rust-lang/rust/pull/72413/
524 [72014]: https://github.com/rust-lang/rust/pull/72014/
525 [72062]: https://github.com/rust-lang/rust/pull/72062/
526 [72094]: https://github.com/rust-lang/rust/pull/72094/
527 [72133]: https://github.com/rust-lang/rust/pull/72133/
528 [71900]: https://github.com/rust-lang/rust/pull/71900/
529 [71928]: https://github.com/rust-lang/rust/pull/71928/
530 [71662]: https://github.com/rust-lang/rust/pull/71662/
531 [71716]: https://github.com/rust-lang/rust/pull/71716/
532 [71447]: https://github.com/rust-lang/rust/pull/71447/
533 [71269]: https://github.com/rust-lang/rust/pull/71269/
534 [71095]: https://github.com/rust-lang/rust/pull/71095/
535 [71140]: https://github.com/rust-lang/rust/pull/71140/
536 [70655]: https://github.com/rust-lang/rust/pull/70655/
537 [70705]: https://github.com/rust-lang/rust/pull/70705/
538 [69984]: https://github.com/rust-lang/rust/pull/69984/
539 [69813]: https://github.com/rust-lang/rust/pull/69813/
540 [69464]: https://github.com/rust-lang/rust/pull/69464/
541 [68717]: https://github.com/rust-lang/rust/pull/68717/
542 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
543 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
544 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
545 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
546 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
547 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
548 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
549 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
550 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
551 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
552 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
553 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
554 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
555 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
556 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
557 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
558 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
561 Version 1.44.1 (2020-06-18)
562 ===========================
564 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
565 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
566 * [Fix crashes when finding backtrace on macOS.][71397]
567 * [Clippy applies lint levels into different files.][clippy/5356]
569 [71397]: https://github.com/rust-lang/rust/issues/71397
570 [73078]: https://github.com/rust-lang/rust/issues/73078
571 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
572 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
575 Version 1.44.0 (2020-06-04)
576 ==========================
580 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
581 - [Added the `unused_braces` lint.][70081]
583 **Syntax-only changes**
585 - [Expansion-driven outline module parsing][69838]
590 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
595 These are still rejected semantically, so you will likely receive an error but
596 these changes can be seen and parsed by macros and conditional compilation.
600 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
601 Additionally when in incremental mode rustc defaults to 256 codegen units.
602 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
603 a panic is thrown.][67502]
604 - [Added tier 3\* support for the `aarch64-unknown-none` and
605 `aarch64-unknown-none-softfloat` targets.][68334]
606 - [Added tier 3 support for `arm64-apple-tvos` and
607 `x86_64-apple-tvos` targets.][68191]
612 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
613 `vec![]` to be able to be used in `const` contexts.
614 - [`convert::Infallible` now implements `Hash`.][70281]
615 - [`OsString` now implements `DerefMut` and `IndexMut` returning
616 a `&mut OsStr`.][70048]
617 - [Unicode 13 is now supported.][69929]
618 - [`String` now implements `From<&mut str>`.][69661]
619 - [`IoSlice` now implements `Copy`.][69403]
620 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
621 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
622 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
623 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
624 integer types.][69373]
628 - [`PathBuf::with_capacity`]
629 - [`PathBuf::capacity`]
631 - [`PathBuf::reserve`]
632 - [`PathBuf::reserve_exact`]
633 - [`PathBuf::shrink_to_fit`]
634 - [`f32::to_int_unchecked`]
635 - [`f64::to_int_unchecked`]
636 - [`Layout::align_to`]
637 - [`Layout::pad_to_align`]
643 - [Added the `cargo tree` command which will print a tree graph of
644 your dependencies.][cargo/8062] E.g.
646 mdbook v0.3.2 (/Users/src/rust/mdbook)
648 │ ├── html5ever v0.24.0
650 │ │ │ └── cfg-if v0.1.9
652 │ │ └── markup5ever v0.9.0
653 │ │ ├── log v0.4.8 (*)
655 │ │ │ └── phf_shared v0.7.24
656 │ │ │ ├── siphasher v0.2.3
657 │ │ │ └── unicase v1.4.2
658 │ │ │ [build-dependencies]
659 │ │ │ └── version_check v0.1.5
662 You can also display dependencies on multiple versions of the same crate with
663 `cargo tree -d` (short for `cargo tree --duplicates`).
667 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
668 the version in the sidebar.][69494]
672 - [Rustc now correctly generates static libraries on Windows GNU targets with
673 the `.a` extension, rather than the previous `.lib`.][70937]
674 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
675 - [The `file_name` property in JSON output of macro errors now points the actual
676 source file rather than the previous format of `<NAME macros>`.][70969]
677 **Note:** this may not point to a file that actually exists on the user's system.
678 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
679 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
680 not allow zero initialization such as `NonZeroU8`.][66059] This was
681 previously a warning.
682 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
683 operator has been defined as a saturating operation.][71269] This was previously
684 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
685 continue using the current behaviour, which may be desirable in rare performance
686 sensitive situations.
690 These changes provide no direct user facing benefits, but represent significant
691 improvements to the internals and overall performance of rustc and
694 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
695 - [Replace big JS dict with JSON parsing.][71250]
697 [69373]: https://github.com/rust-lang/rust/pull/69373/
698 [66059]: https://github.com/rust-lang/rust/pull/66059/
699 [68191]: https://github.com/rust-lang/rust/pull/68191/
700 [68899]: https://github.com/rust-lang/rust/pull/68899/
701 [71147]: https://github.com/rust-lang/rust/pull/71147/
702 [71250]: https://github.com/rust-lang/rust/pull/71250/
703 [70937]: https://github.com/rust-lang/rust/pull/70937/
704 [70969]: https://github.com/rust-lang/rust/pull/70969/
705 [70632]: https://github.com/rust-lang/rust/pull/70632/
706 [70281]: https://github.com/rust-lang/rust/pull/70281/
707 [70345]: https://github.com/rust-lang/rust/pull/70345/
708 [70048]: https://github.com/rust-lang/rust/pull/70048/
709 [70081]: https://github.com/rust-lang/rust/pull/70081/
710 [70156]: https://github.com/rust-lang/rust/pull/70156/
711 [71269]: https://github.com/rust-lang/rust/pull/71269/
712 [69838]: https://github.com/rust-lang/rust/pull/69838/
713 [69929]: https://github.com/rust-lang/rust/pull/69929/
714 [69661]: https://github.com/rust-lang/rust/pull/69661/
715 [69778]: https://github.com/rust-lang/rust/pull/69778/
716 [69494]: https://github.com/rust-lang/rust/pull/69494/
717 [69403]: https://github.com/rust-lang/rust/pull/69403/
718 [69033]: https://github.com/rust-lang/rust/pull/69033/
719 [68692]: https://github.com/rust-lang/rust/pull/68692/
720 [68334]: https://github.com/rust-lang/rust/pull/68334/
721 [67502]: https://github.com/rust-lang/rust/pull/67502/
722 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
723 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
724 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
725 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
726 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
727 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
728 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
729 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
730 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
731 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
732 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
733 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
734 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
737 Version 1.43.1 (2020-05-07)
738 ===========================
740 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
741 * [Fixed the stabilization of AVX-512 features.][71473]
742 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
744 [71430]: https://github.com/rust-lang/rust/pull/71430
745 [71473]: https://github.com/rust-lang/rust/issues/71473
746 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
749 Version 1.43.0 (2020-04-23)
750 ==========================
754 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
755 the type inferred correctly.][68129]
756 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
758 **Syntax only changes**
759 - [Allow `type Foo: Ord` syntactically.][69361]
760 - [Fuse associated and extern items up to defaultness.][69194]
761 - [Syntactically allow `self` in all `fn` contexts.][68764]
762 - [Merge `fn` syntax + cleanup item parsing.][68728]
763 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
764 For example, you may now write:
766 macro_rules! mac_trait {
776 These are still rejected *semantically*, so you will likely receive an error but
777 these changes can be seen and parsed by macros and
778 conditional compilation.
783 - [You can now pass multiple lint flags to rustc to override the previous
784 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
785 everything in the `unused` lint group except `unused-variables` which
786 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
787 everything in the `unused` lint group **including** `unused-variables` since
788 the allow flag is specified before the deny flag (and therefore overridden).
789 - [rustc will now prefer your system MinGW libraries over its bundled libraries
790 if they are available on `windows-gnu`.][67429]
791 - [rustc now buffers errors/warnings printed in JSON.][69227]
795 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
796 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
797 respectively.][69538] **Note** These conversions are only available when `N`
799 - [You can now use associated constants on floats and integers directly, rather
800 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
801 `f32::NAN` with no imports.
802 - [`u8::is_ascii` is now `const`.][68984]
803 - [`String` now implements `AsMut<str>`.][68742]
804 - [Added the `primitive` module to `std` and `core`.][67637] This module
805 reexports Rust's primitive types. This is mainly useful in macros
806 where you want avoid these types being shadowed.
807 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
808 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
812 - [`Once::is_completed`]
817 - [`iter::once_with`]
821 - [You can now set config `[profile]`s in your `.cargo/config`, or through
822 your environment.][cargo/7823]
823 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
824 executable path when running integration tests or benchmarks.][cargo/7697]
825 `<name>` is the name of your binary as-is e.g. If you wanted the executable
826 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
830 - [Certain checks in the `const_err` lint were deemed unrelated to const
831 evaluation][69185], and have been moved to the `unconditional_panic` and
832 `arithmetic_overflow` lints.
837 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
838 has been a warning since 1.36.0.
839 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
840 led to some instances being accepted, and now correctly emits a hard error.
842 [69340]: https://github.com/rust-lang/rust/pull/69340
846 These changes provide no direct user facing benefits, but represent significant
847 improvements to the internals and overall performance of `rustc` and
850 - [All components are now built with `opt-level=3` instead of `2`.][67878]
851 - [Improved how rustc generates drop code.][67332]
852 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
853 - [traits: preallocate 2 Vecs of known initial size][69022]
854 - [Avoid exponential behaviour when relating types][68772]
855 - [Skip `Drop` terminators for enum variants without drop glue][68943]
856 - [Improve performance of coherence checks][68966]
857 - [Deduplicate types in the generator witness][68672]
858 - [Invert control in struct_lint_level.][68725]
860 [67332]: https://github.com/rust-lang/rust/pull/67332/
861 [67429]: https://github.com/rust-lang/rust/pull/67429/
862 [67637]: https://github.com/rust-lang/rust/pull/67637/
863 [67642]: https://github.com/rust-lang/rust/pull/67642/
864 [67878]: https://github.com/rust-lang/rust/pull/67878/
865 [67885]: https://github.com/rust-lang/rust/pull/67885/
866 [68129]: https://github.com/rust-lang/rust/pull/68129/
867 [68672]: https://github.com/rust-lang/rust/pull/68672/
868 [68725]: https://github.com/rust-lang/rust/pull/68725/
869 [68728]: https://github.com/rust-lang/rust/pull/68728/
870 [68738]: https://github.com/rust-lang/rust/pull/68738/
871 [68742]: https://github.com/rust-lang/rust/pull/68742/
872 [68764]: https://github.com/rust-lang/rust/pull/68764/
873 [68772]: https://github.com/rust-lang/rust/pull/68772/
874 [68943]: https://github.com/rust-lang/rust/pull/68943/
875 [68952]: https://github.com/rust-lang/rust/pull/68952/
876 [68966]: https://github.com/rust-lang/rust/pull/68966/
877 [68984]: https://github.com/rust-lang/rust/pull/68984/
878 [69022]: https://github.com/rust-lang/rust/pull/69022/
879 [69185]: https://github.com/rust-lang/rust/pull/69185/
880 [69194]: https://github.com/rust-lang/rust/pull/69194/
881 [69201]: https://github.com/rust-lang/rust/pull/69201/
882 [69227]: https://github.com/rust-lang/rust/pull/69227/
883 [69548]: https://github.com/rust-lang/rust/pull/69548/
884 [69256]: https://github.com/rust-lang/rust/pull/69256/
885 [69361]: https://github.com/rust-lang/rust/pull/69361/
886 [69366]: https://github.com/rust-lang/rust/pull/69366/
887 [69538]: https://github.com/rust-lang/rust/pull/69538/
888 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
889 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
890 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
891 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
892 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
893 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
894 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
895 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
898 Version 1.42.0 (2020-03-12)
899 ==========================
903 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
905 fn foo(words: &[&str]) {
907 ["Hello", "World", "!", ..] => println!("Hello World!"),
908 ["Foo", "Bar", ..] => println!("Baz"),
909 rest => println!("{:?}", rest),
913 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
914 that you can create an enum that has the exact layout and ABI of the type
916 - [There are some *syntax-only* changes:][67131]
917 - `default` is syntactically allowed before items in `trait` definitions.
918 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
919 leave out their bodies in favor of `;`.
920 - Bounds on associated types in `impl`s are now syntactically allowed
921 (e.g. `type Foo: Ord;`).
922 - `...` (the C-variadic type) may occur syntactically directly as the type of
923 any function parameter.
925 These are still rejected *semantically*, so you will likely receive an error
926 but these changes can be seen and parsed by procedural macros and
927 conditional compilation.
931 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
932 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
933 - [`Option::{expect,unwrap}` and
934 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
935 pointing to the location where they were called, rather than
936 `core`'s internals. ][67887]
938 \* Refer to Rust's [platform support page][forge-platform-support] for more
939 information on Rust's tiered platform support.
943 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
944 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
945 to implement `Sized`.][67935]
946 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
947 - [`Layout::new` is now `const`.][66254]
948 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
953 - [`CondVar::wait_while`]
954 - [`CondVar::wait_timeout_while`]
956 - [`DebugMap::value`]
957 - [`ManuallyDrop::take`]
959 - [`ptr::slice_from_raw_parts_mut`]
960 - [`ptr::slice_from_raw_parts`]
964 - [You no longer need to include `extern crate proc_macro;` to be able to
965 `use proc_macro;` in the `2018` edition.][cargo/7700]
969 - [`Error::description` has been deprecated, and its use will now produce a
970 warning.][66919] It's recommended to use `Display`/`to_string` instead.
972 [68253]: https://github.com/rust-lang/rust/pull/68253/
973 [68348]: https://github.com/rust-lang/rust/pull/68348/
974 [67935]: https://github.com/rust-lang/rust/pull/67935/
975 [68339]: https://github.com/rust-lang/rust/pull/68339/
976 [68122]: https://github.com/rust-lang/rust/pull/68122/
977 [67712]: https://github.com/rust-lang/rust/pull/67712/
978 [67887]: https://github.com/rust-lang/rust/pull/67887/
979 [67131]: https://github.com/rust-lang/rust/pull/67131/
980 [67233]: https://github.com/rust-lang/rust/pull/67233/
981 [66899]: https://github.com/rust-lang/rust/pull/66899/
982 [66919]: https://github.com/rust-lang/rust/pull/66919/
983 [66254]: https://github.com/rust-lang/rust/pull/66254/
984 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
985 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
986 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
987 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
988 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
989 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
990 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
991 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
992 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
995 Version 1.41.1 (2020-02-27)
996 ===========================
998 * [Always check types of static items][69145]
999 * [Always check lifetime bounds of `Copy` impls][69145]
1000 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1002 [69225]: https://github.com/rust-lang/rust/issues/69225
1003 [69145]: https://github.com/rust-lang/rust/pull/69145
1006 Version 1.41.0 (2020-01-30)
1007 ===========================
1012 - [You can now pass type parameters to foreign items when implementing
1013 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1014 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1015 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1016 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1017 - [You can now use any valid identifier in a `format_args` macro.][66847]
1018 Previously identifiers starting with an underscore were not allowed.
1019 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1020 enum variants.][66183] These are still rejected semantically, but
1021 can be seen and parsed by procedural macros and conditional compilation.
1026 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1027 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1028 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1029 - [You can now pass an arguments file passing the `@path` syntax
1030 to rustc.][66172] Note that the format differs somewhat from what is
1031 found in other tooling; please see [the documentation][argfile-docs] for
1033 - [You can now provide `--extern` flag without a path, indicating that it is
1034 available from the search path or specified with an `-L` flag.][64882]
1036 \* Refer to Rust's [platform support page][forge-platform-support] for more
1037 information on Rust's tiered platform support.
1039 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1044 - [The `core::panic` module is now stable.][66771] It was already stable
1046 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1047 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1048 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1053 - [`Result::map_or`]
1054 - [`Result::map_or_else`]
1055 - [`std::rc::Weak::weak_count`]
1056 - [`std::rc::Weak::strong_count`]
1057 - [`std::sync::Weak::weak_count`]
1058 - [`std::sync::Weak::strong_count`]
1063 - [Cargo will now document all the private items for binary crates
1064 by default.][cargo/7593]
1065 - [`cargo-install` will now reinstall the package if it detects that it is out
1066 of date.][cargo/7560]
1067 - [Cargo.lock now uses a more git friendly format that should help to reduce
1068 merge conflicts.][cargo/7579]
1069 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1070 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1071 optimisation level to `2` for debug builds. You can also use
1072 `[profile.<profile>.build-override]` to override build scripts and
1078 - [You can now specify `edition` in documentation code blocks to compile the block
1079 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1080 should be compiled the 2018 edition of Rust.
1081 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1082 current theme with `--check-theme`.][54733]
1083 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1088 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1089 Apple targets.][apple-32bit-drop] This means that the source code is still
1090 available to build, but the targets are no longer being tested and release
1091 binaries for those platforms will no longer be distributed by the Rust project.
1092 Please refer to the linked blog post for more information.
1094 [54733]: https://github.com/rust-lang/rust/pull/54733/
1095 [61351]: https://github.com/rust-lang/rust/pull/61351/
1096 [67255]: https://github.com/rust-lang/rust/pull/67255/
1097 [66661]: https://github.com/rust-lang/rust/pull/66661/
1098 [66771]: https://github.com/rust-lang/rust/pull/66771/
1099 [66847]: https://github.com/rust-lang/rust/pull/66847/
1100 [66238]: https://github.com/rust-lang/rust/pull/66238/
1101 [66277]: https://github.com/rust-lang/rust/pull/66277/
1102 [66325]: https://github.com/rust-lang/rust/pull/66325/
1103 [66172]: https://github.com/rust-lang/rust/pull/66172/
1104 [66183]: https://github.com/rust-lang/rust/pull/66183/
1105 [65879]: https://github.com/rust-lang/rust/pull/65879/
1106 [65013]: https://github.com/rust-lang/rust/pull/65013/
1107 [64882]: https://github.com/rust-lang/rust/pull/64882/
1108 [64325]: https://github.com/rust-lang/rust/pull/64325/
1109 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1110 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1111 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1112 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1113 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1114 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1115 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1116 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1117 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1118 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1119 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1121 Version 1.40.0 (2019-12-19)
1122 ===========================
1126 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1127 `const` contexts.][65188] e.g.
1130 pub struct Point(i32, i32);
1132 const ORIGIN: Point = {
1133 let constructor = Point;
1139 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1140 indicate that there may be variants or fields added in the future.][64639]
1141 For example this requires adding a wild-card branch (`_ => {}`) to any match
1142 statements on a non-exhaustive `enum`. [(RFC 2008)]
1143 - [You can now use function-like procedural macros in `extern` blocks and in
1144 type positions.][63931] e.g. `type Generated = macro!();`
1145 - [Function-like and attribute procedural macros can now emit
1146 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1147 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1148 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1149 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1153 - [Added tier 3 support\* for the
1154 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1155 - [Added tier 3 support for the
1156 `aarch64-unknown-none-softfloat` target.][64589]
1157 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1158 `mips64el-unknown-linux-muslabi64` targets.][65843]
1160 \* Refer to Rust's [platform support page][forge-platform-support] for more
1161 information on Rust's tiered platform support.
1165 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1169 - [`BTreeMap::get_key_value`]
1170 - [`HashMap::get_key_value`]
1171 - [`Option::as_deref_mut`]
1172 - [`Option::as_deref`]
1173 - [`Option::flatten`]
1174 - [`UdpSocket::peer_addr`]
1175 - [`f32::to_be_bytes`]
1176 - [`f32::to_le_bytes`]
1177 - [`f32::to_ne_bytes`]
1178 - [`f64::to_be_bytes`]
1179 - [`f64::to_le_bytes`]
1180 - [`f64::to_ne_bytes`]
1181 - [`f32::from_be_bytes`]
1182 - [`f32::from_le_bytes`]
1183 - [`f32::from_ne_bytes`]
1184 - [`f64::from_be_bytes`]
1185 - [`f64::from_le_bytes`]
1186 - [`f64::from_ne_bytes`]
1193 - [Cargo will now always display warnings, rather than only on
1194 fresh builds.][cargo/7450]
1195 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1196 now produce an error.][cargo/7507] Previously these flags were ignored.
1197 - [You can now publish `dev-dependencies` without including
1198 a `version`.][cargo/7333]
1202 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1203 when running documentation tests with `rustdoc`.][63803]
1207 - [As previously announced, any previous NLL warnings in the 2015 edition are
1208 now hard errors.][64221]
1209 - [The `include!` macro will now warn if it failed to include the
1210 entire file.][64284] The `include!` macro unintentionally only includes the
1211 first _expression_ in a file, and this can be unintuitive. This will become
1212 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1213 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1214 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1215 or `extern` blocks now correctly emits a hard error.
1217 [65294]: https://github.com/rust-lang/rust/pull/65294/
1218 [66103]: https://github.com/rust-lang/rust/pull/66103/
1219 [65843]: https://github.com/rust-lang/rust/pull/65843/
1220 [65188]: https://github.com/rust-lang/rust/pull/65188/
1221 [65092]: https://github.com/rust-lang/rust/pull/65092/
1222 [64589]: https://github.com/rust-lang/rust/pull/64589/
1223 [64639]: https://github.com/rust-lang/rust/pull/64639/
1224 [64221]: https://github.com/rust-lang/rust/pull/64221/
1225 [64284]: https://github.com/rust-lang/rust/pull/64284/
1226 [63931]: https://github.com/rust-lang/rust/pull/63931/
1227 [64035]: https://github.com/rust-lang/rust/pull/64035/
1228 [63674]: https://github.com/rust-lang/rust/pull/63674/
1229 [63803]: https://github.com/rust-lang/rust/pull/63803/
1230 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1231 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1232 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1233 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1234 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1235 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1236 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1237 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1238 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1239 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1240 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1241 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1242 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1243 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1244 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1245 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1246 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1247 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1248 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1249 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1250 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1251 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1252 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1253 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1254 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1255 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1258 Version 1.39.0 (2019-11-07)
1259 ===========================
1263 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1264 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1265 - [You can now use certain attributes on function, closure, and function pointer
1266 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1267 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1268 attributes applied to items. e.g.
1271 #[cfg(windows)] slice: &[u16],
1272 #[cfg(not(windows))] slice: &[u8],
1277 - [You can now take shared references to bind-by-move patterns in the `if` guards
1278 of `match` arms.][63118] e.g.
1281 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1285 // ---- `nums` is bound by move.
1286 if nums.iter().sum::<u8>() == 10
1287 // ^------ `.iter()` implicitly takes a reference to `nums`.
1290 // ----------- Legal as `nums` was bound by move and so we have ownership.
1292 _ => unreachable!(),
1301 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1302 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1303 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1304 **Note** Cargo currently doesn't use this feature. Refer to
1305 [cargo#7315][cargo/7315] to track this feature's progress.
1306 - [You can now pass `--show-output` argument to test binaries to print the
1307 output of successful tests.][62600]
1310 \* Refer to Rust's [platform support page][forge-platform-support] for more
1311 information on Rust's tiered platform support.
1315 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1316 - [`LinkedList::new` is now a `const` function.][63684]
1317 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1318 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1319 now `const`.][63786]
1323 - [`Pin::into_inner`]
1324 - [`Instant::checked_duration_since`]
1325 - [`Instant::saturating_duration_since`]
1329 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1330 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1331 `--all` is now deprecated.
1335 - [You can now pass `-Clinker` to rustdoc to control the linker used
1336 for compiling doctests.][63834]
1340 - [Code that was previously accepted by the old borrow checker, but rejected by
1341 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1342 previously a warning, and will also become a hard error in the Rust 2015
1343 edition in the 1.40.0 release.
1344 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1345 run tests.][63827] This should improve performance when running a large
1347 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1348 recommended to use the `?` operator instead.
1349 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1352 [62600]: https://github.com/rust-lang/rust/pull/62600/
1353 [62672]: https://github.com/rust-lang/rust/pull/62672/
1354 [63118]: https://github.com/rust-lang/rust/pull/63118/
1355 [63209]: https://github.com/rust-lang/rust/pull/63209/
1356 [63402]: https://github.com/rust-lang/rust/pull/63402/
1357 [63565]: https://github.com/rust-lang/rust/pull/63565/
1358 [63595]: https://github.com/rust-lang/rust/pull/63595/
1359 [63684]: https://github.com/rust-lang/rust/pull/63684/
1360 [63698]: https://github.com/rust-lang/rust/pull/63698/
1361 [63770]: https://github.com/rust-lang/rust/pull/63770/
1362 [63786]: https://github.com/rust-lang/rust/pull/63786/
1363 [63827]: https://github.com/rust-lang/rust/pull/63827/
1364 [63834]: https://github.com/rust-lang/rust/pull/63834/
1365 [63927]: https://github.com/rust-lang/rust/pull/63927/
1366 [63933]: https://github.com/rust-lang/rust/pull/63933/
1367 [63934]: https://github.com/rust-lang/rust/pull/63934/
1368 [63938]: https://github.com/rust-lang/rust/pull/63938/
1369 [63940]: https://github.com/rust-lang/rust/pull/63940/
1370 [63941]: https://github.com/rust-lang/rust/pull/63941/
1371 [63945]: https://github.com/rust-lang/rust/pull/63945/
1372 [64010]: https://github.com/rust-lang/rust/pull/64010/
1373 [64028]: https://github.com/rust-lang/rust/pull/64028/
1374 [64334]: https://github.com/rust-lang/rust/pull/64334/
1375 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1376 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1377 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1378 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1379 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1380 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1382 Version 1.38.0 (2019-09-26)
1383 ==========================
1387 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1388 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1392 - [Added pipelined compilation support to `rustc`.][62766] This will
1393 improve compilation times in some cases. For further information please refer
1394 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1395 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1396 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1397 `x86_64-uwp-windows-msvc` targets.][60260]
1398 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1399 `armv7-unknown-linux-musleabi` targets.][63107]
1400 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1401 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1403 \* Refer to Rust's [platform support page][forge-platform-support] for more
1404 information on Rust's tiered platform support.
1408 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1409 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1410 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1411 is available at `std::clone::Clone`). This also makes all built-in macros
1412 available in `std`/`core` root. e.g. `std::include_bytes!`.
1413 - [`str::Chars` now implements `Debug`.][63000]
1414 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1415 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1416 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1417 - [Added euclidean remainder and division operations (`div_euclid`,
1418 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1419 `overflowing`, and `wrapping` versions are available for all
1421 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1422 `PartialEq`.][61491]
1423 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1427 - [`<*const T>::cast`]
1428 - [`<*mut T>::cast`]
1429 - [`Duration::as_secs_f32`]
1430 - [`Duration::as_secs_f64`]
1431 - [`Duration::div_f32`]
1432 - [`Duration::div_f64`]
1433 - [`Duration::from_secs_f32`]
1434 - [`Duration::from_secs_f64`]
1435 - [`Duration::mul_f32`]
1436 - [`Duration::mul_f64`]
1437 - [`any::type_name`]
1441 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1442 - [You can now pass the `--features` option multiple times to enable
1443 multiple features.][cargo/7084]
1447 - [`rustc` will now warn about some incorrect uses of
1448 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1452 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1454 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1455 issues][62896] with certain crates such as libc.
1457 [60260]: https://github.com/rust-lang/rust/pull/60260/
1458 [61457]: https://github.com/rust-lang/rust/pull/61457/
1459 [61491]: https://github.com/rust-lang/rust/pull/61491/
1460 [61884]: https://github.com/rust-lang/rust/pull/61884/
1461 [61953]: https://github.com/rust-lang/rust/pull/61953/
1462 [62042]: https://github.com/rust-lang/rust/pull/62042/
1463 [62528]: https://github.com/rust-lang/rust/pull/62528/
1464 [62583]: https://github.com/rust-lang/rust/pull/62583/
1465 [62735]: https://github.com/rust-lang/rust/pull/62735/
1466 [62766]: https://github.com/rust-lang/rust/pull/62766/
1467 [62784]: https://github.com/rust-lang/rust/pull/62784/
1468 [62785]: https://github.com/rust-lang/rust/issues/62785/
1469 [62814]: https://github.com/rust-lang/rust/pull/62814/
1470 [62896]: https://github.com/rust-lang/rust/issues/62896/
1471 [63000]: https://github.com/rust-lang/rust/pull/63000/
1472 [63056]: https://github.com/rust-lang/rust/pull/63056/
1473 [63107]: https://github.com/rust-lang/rust/pull/63107/
1474 [63346]: https://github.com/rust-lang/rust/pull/63346/
1475 [63421]: https://github.com/rust-lang/rust/pull/63421/
1476 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1477 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1478 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1479 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1480 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1481 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1482 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1483 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1484 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1485 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1486 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1487 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1488 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1489 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1490 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1492 Version 1.37.0 (2019-08-15)
1493 ==========================
1497 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1498 [`Box`][62228], or an [array][62235] and unused.
1499 - [You can now use the `cfg` and `cfg_attr` attributes on
1500 generic parameters.][61547]
1501 - [You can now use enum variants through type alias.][61682] e.g. You can
1502 write the following:
1504 type MyOption = Option<u8>;
1506 fn increment_or_zero(x: MyOption) -> u8 {
1508 MyOption::Some(y) => y + 1,
1509 MyOption::None => 0,
1513 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1514 `const _: u32 = 5;`.
1515 - [You can now use `#[repr(align(X)]` on enums.][61229]
1516 - [The `?` Kleene macro operator is now available in the
1517 2015 edition.][60932]
1521 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1522 and `-C profile-use` flags.][61268] For more information on how to use profile
1523 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1524 - [The `rust-lldb` wrapper script should now work again.][61827]
1528 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1532 - [`BufReader::buffer`]
1533 - [`BufWriter::buffer`]
1534 - [`Cell::from_mut`]
1535 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1536 - [`DoubleEndedIterator::nth_back`]
1538 - [`Wrapping::reverse_bits`]
1539 - [`i128::reverse_bits`]
1540 - [`i16::reverse_bits`]
1541 - [`i32::reverse_bits`]
1542 - [`i64::reverse_bits`]
1543 - [`i8::reverse_bits`]
1544 - [`isize::reverse_bits`]
1545 - [`slice::copy_within`]
1546 - [`u128::reverse_bits`]
1547 - [`u16::reverse_bits`]
1548 - [`u32::reverse_bits`]
1549 - [`u64::reverse_bits`]
1550 - [`u8::reverse_bits`]
1551 - [`usize::reverse_bits`]
1555 - [`Cargo.lock` files are now included by default when publishing executable crates
1556 with executables.][cargo/7026]
1557 - [You can now specify `default-run="foo"` in `[package]` to specify the
1558 default executable to use for `cargo run`.][cargo/7056]
1565 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1566 Please transition your code to using the `..=` syntax for inclusive
1568 - [Using a trait object without the `dyn` will now warn by default.][61203]
1569 Please transition your code to use `dyn Trait` for trait objects instead.
1571 [62228]: https://github.com/rust-lang/rust/pull/62228/
1572 [62235]: https://github.com/rust-lang/rust/pull/62235/
1573 [61802]: https://github.com/rust-lang/rust/pull/61802/
1574 [61827]: https://github.com/rust-lang/rust/pull/61827/
1575 [61547]: https://github.com/rust-lang/rust/pull/61547/
1576 [61682]: https://github.com/rust-lang/rust/pull/61682/
1577 [61268]: https://github.com/rust-lang/rust/pull/61268/
1578 [61342]: https://github.com/rust-lang/rust/pull/61342/
1579 [61347]: https://github.com/rust-lang/rust/pull/61347/
1580 [61100]: https://github.com/rust-lang/rust/pull/61100/
1581 [61203]: https://github.com/rust-lang/rust/pull/61203/
1582 [61229]: https://github.com/rust-lang/rust/pull/61229/
1583 [60932]: https://github.com/rust-lang/rust/pull/60932/
1584 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1585 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1586 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1587 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1588 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1589 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1590 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1591 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1592 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1593 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1594 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1595 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1596 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1597 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1598 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1599 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1600 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1601 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1602 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1603 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1604 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1605 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1606 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1607 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1610 Version 1.36.0 (2019-07-04)
1611 ==========================
1615 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1616 - [The order of traits in trait objects no longer affects the semantics of that
1617 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1618 `dyn fmt::Debug + Send`, where this was previously not the case.
1622 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1623 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1624 - [`mem::needs_drop` is now available as a const fn.][60364]
1625 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1626 - [`String` now implements `BorrowMut<str>`.][60404]
1627 - [`io::Cursor` now implements `Default`.][60234]
1628 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1629 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1630 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1631 environment has access to heap memory allocation.
1632 - [`String` now implements `From<&String>`.][59825]
1633 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1634 return a tuple of each argument when there is multiple arguments.
1635 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1640 - [`VecDeque::rotate_left`]
1641 - [`VecDeque::rotate_right`]
1642 - [`Iterator::copied`]
1644 - [`io::IoSliceMut`]
1645 - [`Read::read_vectored`]
1646 - [`Write::write_vectored`]
1647 - [`str::as_mut_ptr`]
1648 - [`mem::MaybeUninit`]
1649 - [`pointer::align_offset`]
1650 - [`future::Future`]
1652 - [`task::RawWaker`]
1653 - [`task::RawWakerVTable`]
1659 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1660 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1662 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1666 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1673 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1674 longer recommended, and will be deprecated in 1.39.0.
1676 [60318]: https://github.com/rust-lang/rust/pull/60318/
1677 [60364]: https://github.com/rust-lang/rust/pull/60364/
1678 [60370]: https://github.com/rust-lang/rust/pull/60370/
1679 [60404]: https://github.com/rust-lang/rust/pull/60404/
1680 [60234]: https://github.com/rust-lang/rust/pull/60234/
1681 [60244]: https://github.com/rust-lang/rust/pull/60244/
1682 [58623]: https://github.com/rust-lang/rust/pull/58623/
1683 [59648]: https://github.com/rust-lang/rust/pull/59648/
1684 [59675]: https://github.com/rust-lang/rust/pull/59675/
1685 [59825]: https://github.com/rust-lang/rust/pull/59825/
1686 [59826]: https://github.com/rust-lang/rust/pull/59826/
1687 [59445]: https://github.com/rust-lang/rust/pull/59445/
1688 [59114]: https://github.com/rust-lang/rust/pull/59114/
1689 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1690 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1691 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1692 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1693 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1694 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1695 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1696 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1697 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1698 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1699 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1700 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1701 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1702 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1703 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1704 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1705 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1706 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1707 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1708 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1711 Version 1.35.0 (2019-05-23)
1712 ==========================
1716 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1717 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1718 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1720 unsafe fn call_unsafe(func: unsafe fn()) {
1725 unsafe { call_unsafe(|| {}); }
1732 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1733 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1734 - [Added the `wasm32-unknown-wasi` target.][59464]
1739 - [`Thread` will now show its ID in `Debug` output.][59460]
1740 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1741 - [`alloc::System` now implements `Default`.][59451]
1742 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1744 - [`char::{ToLowercase, ToUppercase}` now
1745 implement `ExactSizeIterator`.][58778]
1746 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1747 - [Removed the `Read` trait bounds
1748 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1749 - [You can now call the `dbg!` macro without any parameters to print the file
1750 and line where it is called.][57847]
1751 - [In place ASCII case conversions are now up to 4× faster.][59283]
1752 e.g. `str::make_ascii_lowercase`
1753 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1760 - [`RefCell::replace_with`]
1761 - [`RefCell::map_split`]
1763 - [`Range::contains`]
1764 - [`RangeFrom::contains`]
1765 - [`RangeTo::contains`]
1766 - [`RangeInclusive::contains`]
1767 - [`RangeToInclusive::contains`]
1768 - [`Option::copied`]
1772 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1773 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1778 - [The Rust toolchain is now available natively for musl based distros.][58575]
1780 [59460]: https://github.com/rust-lang/rust/pull/59460/
1781 [59464]: https://github.com/rust-lang/rust/pull/59464/
1782 [59500]: https://github.com/rust-lang/rust/pull/59500/
1783 [59512]: https://github.com/rust-lang/rust/pull/59512/
1784 [59580]: https://github.com/rust-lang/rust/pull/59580/
1785 [59283]: https://github.com/rust-lang/rust/pull/59283/
1786 [59451]: https://github.com/rust-lang/rust/pull/59451/
1787 [59076]: https://github.com/rust-lang/rust/pull/59076/
1788 [58778]: https://github.com/rust-lang/rust/pull/58778/
1789 [58717]: https://github.com/rust-lang/rust/pull/58717/
1790 [58369]: https://github.com/rust-lang/rust/pull/58369/
1791 [58423]: https://github.com/rust-lang/rust/pull/58423/
1792 [58080]: https://github.com/rust-lang/rust/pull/58080/
1793 [57847]: https://github.com/rust-lang/rust/pull/57847/
1794 [58575]: https://github.com/rust-lang/rust/pull/58575
1795 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1796 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1797 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1798 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1799 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1800 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1801 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1802 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1803 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1804 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1805 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1806 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1808 Version 1.34.2 (2019-05-14)
1809 ===========================
1811 * [Destabilize the `Error::type_id` function due to a security
1812 vulnerability][60785] ([CVE-2019-12083])
1814 [60785]: https://github.com/rust-lang/rust/pull/60785
1815 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1817 Version 1.34.1 (2019-04-25)
1818 ===========================
1820 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1821 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1822 * [Fix Clippy panic when checking some macros][clippy/3805]
1824 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1825 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1826 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1828 Version 1.34.0 (2019-04-11)
1829 ==========================
1833 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1834 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1836 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1837 `#[attr{}]` procedural macros.][57367]
1838 - [You can now write `extern crate self as foo;`][57407] to import your
1839 crate's root into the extern prelude.
1844 - [You can now target `riscv64imac-unknown-none-elf` and
1845 `riscv64gc-unknown-none-elf`.][58406]
1846 - [You can now enable linker plugin LTO optimisations with
1847 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1848 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1850 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1855 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1856 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1857 the `Hash` trait to create an iterator.
1858 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1859 methods.][58421] Most notably you no longer require the `Ord` trait to create
1861 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1862 for all numeric types.][58044]
1863 - [Indexing a `str` is now generic over all types that
1864 implement `SliceIndex<str>`.][57604]
1865 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1866 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1867 produce a warning if their returning type is unused.
1868 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1869 `overflowing_pow` are now available for all numeric types.][57873] These are
1870 equivalent to methods such as `wrapping_add` for the `pow` operation.
1878 * [`Error::type_id`]
1879 * [`atomic::AtomicI16`]
1880 * [`atomic::AtomicI32`]
1881 * [`atomic::AtomicI64`]
1882 * [`atomic::AtomicI8`]
1883 * [`atomic::AtomicU16`]
1884 * [`atomic::AtomicU32`]
1885 * [`atomic::AtomicU64`]
1886 * [`atomic::AtomicU8`]
1887 * [`convert::Infallible`]
1888 * [`convert::TryFrom`]
1889 * [`convert::TryInto`]
1891 * [`iter::successors`]
1892 * [`num::NonZeroI128`]
1893 * [`num::NonZeroI16`]
1894 * [`num::NonZeroI32`]
1895 * [`num::NonZeroI64`]
1896 * [`num::NonZeroI8`]
1897 * [`num::NonZeroIsize`]
1898 * [`slice::sort_by_cached_key`]
1899 * [`str::escape_debug`]
1900 * [`str::escape_default`]
1901 * [`str::escape_unicode`]
1902 * [`str::split_ascii_whitespace`]
1905 * [`Instant::checked_add`]
1906 * [`Instant::checked_sub`]
1907 * [`SystemTime::checked_add`]
1908 * [`SystemTime::checked_sub`]
1912 - [You can now use alternative registries to crates.io.][cargo/6654]
1916 - [You can now use the `?` operator in your documentation tests without manually
1917 adding `fn main() -> Result<(), _> {}`.][56470]
1921 - [`Command::before_exec` is being replaced by the unsafe method
1922 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1923 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1924 can now use `const` functions in `static` variables.
1926 [58370]: https://github.com/rust-lang/rust/pull/58370/
1927 [58406]: https://github.com/rust-lang/rust/pull/58406/
1928 [58421]: https://github.com/rust-lang/rust/pull/58421/
1929 [58166]: https://github.com/rust-lang/rust/pull/58166/
1930 [58044]: https://github.com/rust-lang/rust/pull/58044/
1931 [58057]: https://github.com/rust-lang/rust/pull/58057/
1932 [58059]: https://github.com/rust-lang/rust/pull/58059/
1933 [57809]: https://github.com/rust-lang/rust/pull/57809/
1934 [57873]: https://github.com/rust-lang/rust/pull/57873/
1935 [57604]: https://github.com/rust-lang/rust/pull/57604/
1936 [57367]: https://github.com/rust-lang/rust/pull/57367/
1937 [57407]: https://github.com/rust-lang/rust/pull/57407/
1938 [57425]: https://github.com/rust-lang/rust/pull/57425/
1939 [57106]: https://github.com/rust-lang/rust/pull/57106/
1940 [56470]: https://github.com/rust-lang/rust/pull/56470/
1941 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1942 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1943 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1944 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1945 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1946 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1947 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1948 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1949 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1950 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1951 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1952 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1953 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1954 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1955 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1956 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1957 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1958 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1959 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1960 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1961 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1962 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1963 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1964 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1965 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1966 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1967 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1968 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1969 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1970 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1971 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1974 Version 1.33.0 (2019-02-28)
1975 ==========================
1979 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1980 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1981 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1982 E.g. You can have match statement on a `u8` that covers `0..=255` and
1983 you would no longer be required to have a `_ => unreachable!()` case.
1984 - [You can now have multiple patterns in `if let` and `while let`
1985 expressions.][57532] You can do this with the same syntax as a `match`
1995 let state = Creature::Crab("Ferris");
1997 if let Creature::Crab(name) | Creature::Person(name) = state {
1998 println!("This creature's name is: {}", name);
2002 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2003 this feature will by default produce a warning as this behaviour can be
2004 unintuitive. E.g. `if let _ = 5 {}`
2005 - [You can now use `let` bindings, assignments, expression statements,
2006 and irrefutable pattern destructuring in const functions.][57175]
2007 - [You can now call unsafe const functions.][57067] E.g.
2009 const unsafe fn foo() -> i32 { 5 }
2010 const fn bar() -> i32 {
2014 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2015 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2016 - [You can now specify a specific alignment with the `#[repr(packed)]`
2017 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2018 with an alignment of 2 bytes and a size of 6 bytes.
2019 - [You can now import an item from a module as an `_`.][56303] This allows you to
2020 import a trait's impls, and not have the name in the namespace. E.g.
2022 use std::io::Read as _;
2024 // Allowed as there is only one `Read` in the module.
2027 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2031 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2032 command line argument.][56351]
2033 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2034 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2035 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2036 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2037 information on Rust's platform support.
2038 - [Added support for the `thumbv7neon-linux-androideabi` and
2039 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2040 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2044 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2045 functions for all numeric types.][57566]
2046 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2047 are now `const` functions for all numeric types.][57105]
2048 - [The methods `is_positive` and `is_negative` are now `const` functions for
2049 all signed numeric types.][57105]
2050 - [The `get` method for all `NonZero` types is now `const`.][57167]
2051 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2052 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2053 numeric types.][57234]
2054 - [`Ipv4Addr::new` is now a `const` function][57234]
2058 - [`unix::FileExt::read_exact_at`]
2059 - [`unix::FileExt::write_all_at`]
2060 - [`Option::transpose`]
2061 - [`Result::transpose`]
2062 - [`convert::identity`]
2065 - [`marker::PhantomPinned`]
2066 - [`Vec::resize_with`]
2067 - [`VecDeque::resize_with`]
2068 - [`Duration::as_millis`]
2069 - [`Duration::as_micros`]
2070 - [`Duration::as_nanos`]
2075 - [You can now publish crates that require a feature flag to compile with
2076 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2077 - [Cargo should now rebuild a crate if a file was modified during the initial
2082 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2083 are now deprecated in the standard library, and their usage will now produce a warning.
2084 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2086 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2088 - [Libtest no longer creates a new thread for each test when
2089 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2091 [55982]: https://github.com/rust-lang/rust/pull/55982/
2092 [56243]: https://github.com/rust-lang/rust/pull/56243
2093 [56303]: https://github.com/rust-lang/rust/pull/56303/
2094 [56351]: https://github.com/rust-lang/rust/pull/56351/
2095 [56362]: https://github.com/rust-lang/rust/pull/56362
2096 [56642]: https://github.com/rust-lang/rust/pull/56642/
2097 [56769]: https://github.com/rust-lang/rust/pull/56769/
2098 [56805]: https://github.com/rust-lang/rust/pull/56805
2099 [56947]: https://github.com/rust-lang/rust/pull/56947/
2100 [57049]: https://github.com/rust-lang/rust/pull/57049/
2101 [57067]: https://github.com/rust-lang/rust/pull/57067/
2102 [57105]: https://github.com/rust-lang/rust/pull/57105
2103 [57130]: https://github.com/rust-lang/rust/pull/57130/
2104 [57167]: https://github.com/rust-lang/rust/pull/57167/
2105 [57175]: https://github.com/rust-lang/rust/pull/57175/
2106 [57234]: https://github.com/rust-lang/rust/pull/57234/
2107 [57332]: https://github.com/rust-lang/rust/pull/57332/
2108 [57465]: https://github.com/rust-lang/rust/pull/57465/
2109 [57532]: https://github.com/rust-lang/rust/pull/57532/
2110 [57535]: https://github.com/rust-lang/rust/pull/57535/
2111 [57566]: https://github.com/rust-lang/rust/pull/57566/
2112 [57615]: https://github.com/rust-lang/rust/pull/57615/
2113 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2114 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2115 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2116 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2117 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2118 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2119 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2120 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2121 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2122 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2123 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2124 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2125 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2126 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2127 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2128 [platform-support]: https://forge.rust-lang.org/platform-support.html
2130 Version 1.32.0 (2019-01-17)
2131 ==========================
2136 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2137 operator allows you to specify zero or one repetitions similar to the `*` and
2139 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2140 now always resolve to the item (`enum`, `struct`, etc.) available in the
2141 module if present, before resolving to a external crate or an item the prelude.][56759]
2144 enum Color { Red, Green, Blue }
2150 - [You can now match against `PhantomData<T>` types.][55837]
2151 - [You can now match against literals in macros with the `literal`
2152 specifier.][56072] This will match against a literal of any type.
2153 E.g. `1`, `'A'`, `"Hello World"`
2154 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2156 struct Point(i32, i32);
2159 pub fn new(x: i32, y: i32) -> Self {
2163 pub fn is_origin(&self) -> bool {
2171 - [Self can also now be used in type definitions.][56366] E.g.
2175 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2178 Cons(T, Box<Self>) // likewise here
2181 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2182 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2186 - [The default allocator has changed from jemalloc to the default allocator on
2187 your system.][55238] The compiler itself on Linux & macOS will still use
2188 jemalloc, but programs compiled with it will use the system allocator.
2189 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2193 - [`PathBuf` now implements `FromStr`.][55148]
2194 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2195 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2196 easily debug expressions in your rust program. E.g.
2199 let b = dbg!(a * 2) + 1;
2200 // ^-- prints: [src/main.rs:4] a * 2 = 4
2204 The following APIs are now `const` functions and can be used in a
2208 - [`UnsafeCell::get`]
2209 - [`char::is_ascii`]
2211 - [`ManuallyDrop::new`]
2212 - [`ManuallyDrop::into_inner`]
2213 - [`RangeInclusive::start`]
2214 - [`RangeInclusive::end`]
2215 - [`NonNull::as_ptr`]
2218 - [`Duration::as_secs`]
2219 - [`Duration::subsec_millis`]
2220 - [`Duration::subsec_micros`]
2221 - [`Duration::subsec_nanos`]
2223 - [`Ipv4Addr::is_unspecified`]
2225 - [`Ipv6Addr::octets`]
2229 - [`i8::to_be_bytes`]
2230 - [`i8::to_le_bytes`]
2231 - [`i8::to_ne_bytes`]
2232 - [`i8::from_be_bytes`]
2233 - [`i8::from_le_bytes`]
2234 - [`i8::from_ne_bytes`]
2235 - [`i16::to_be_bytes`]
2236 - [`i16::to_le_bytes`]
2237 - [`i16::to_ne_bytes`]
2238 - [`i16::from_be_bytes`]
2239 - [`i16::from_le_bytes`]
2240 - [`i16::from_ne_bytes`]
2241 - [`i32::to_be_bytes`]
2242 - [`i32::to_le_bytes`]
2243 - [`i32::to_ne_bytes`]
2244 - [`i32::from_be_bytes`]
2245 - [`i32::from_le_bytes`]
2246 - [`i32::from_ne_bytes`]
2247 - [`i64::to_be_bytes`]
2248 - [`i64::to_le_bytes`]
2249 - [`i64::to_ne_bytes`]
2250 - [`i64::from_be_bytes`]
2251 - [`i64::from_le_bytes`]
2252 - [`i64::from_ne_bytes`]
2253 - [`i128::to_be_bytes`]
2254 - [`i128::to_le_bytes`]
2255 - [`i128::to_ne_bytes`]
2256 - [`i128::from_be_bytes`]
2257 - [`i128::from_le_bytes`]
2258 - [`i128::from_ne_bytes`]
2259 - [`isize::to_be_bytes`]
2260 - [`isize::to_le_bytes`]
2261 - [`isize::to_ne_bytes`]
2262 - [`isize::from_be_bytes`]
2263 - [`isize::from_le_bytes`]
2264 - [`isize::from_ne_bytes`]
2265 - [`u8::to_be_bytes`]
2266 - [`u8::to_le_bytes`]
2267 - [`u8::to_ne_bytes`]
2268 - [`u8::from_be_bytes`]
2269 - [`u8::from_le_bytes`]
2270 - [`u8::from_ne_bytes`]
2271 - [`u16::to_be_bytes`]
2272 - [`u16::to_le_bytes`]
2273 - [`u16::to_ne_bytes`]
2274 - [`u16::from_be_bytes`]
2275 - [`u16::from_le_bytes`]
2276 - [`u16::from_ne_bytes`]
2277 - [`u32::to_be_bytes`]
2278 - [`u32::to_le_bytes`]
2279 - [`u32::to_ne_bytes`]
2280 - [`u32::from_be_bytes`]
2281 - [`u32::from_le_bytes`]
2282 - [`u32::from_ne_bytes`]
2283 - [`u64::to_be_bytes`]
2284 - [`u64::to_le_bytes`]
2285 - [`u64::to_ne_bytes`]
2286 - [`u64::from_be_bytes`]
2287 - [`u64::from_le_bytes`]
2288 - [`u64::from_ne_bytes`]
2289 - [`u128::to_be_bytes`]
2290 - [`u128::to_le_bytes`]
2291 - [`u128::to_ne_bytes`]
2292 - [`u128::from_be_bytes`]
2293 - [`u128::from_le_bytes`]
2294 - [`u128::from_ne_bytes`]
2295 - [`usize::to_be_bytes`]
2296 - [`usize::to_le_bytes`]
2297 - [`usize::to_ne_bytes`]
2298 - [`usize::from_be_bytes`]
2299 - [`usize::from_le_bytes`]
2300 - [`usize::from_ne_bytes`]
2304 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2305 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2309 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2313 - [The argument types for AVX's
2314 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2315 been changed from `*const` to `*mut` as the previous implementation
2319 [55148]: https://github.com/rust-lang/rust/pull/55148/
2320 [55238]: https://github.com/rust-lang/rust/pull/55238/
2321 [55280]: https://github.com/rust-lang/rust/pull/55280/
2322 [55610]: https://github.com/rust-lang/rust/pull/55610/
2323 [55663]: https://github.com/rust-lang/rust/pull/55663/
2324 [55702]: https://github.com/rust-lang/rust/pull/55702/
2325 [55837]: https://github.com/rust-lang/rust/pull/55837/
2326 [55843]: https://github.com/rust-lang/rust/pull/55843/
2327 [56072]: https://github.com/rust-lang/rust/pull/56072/
2328 [56245]: https://github.com/rust-lang/rust/pull/56245/
2329 [56365]: https://github.com/rust-lang/rust/pull/56365/
2330 [56366]: https://github.com/rust-lang/rust/pull/56366/
2331 [56395]: https://github.com/rust-lang/rust/pull/56395/
2332 [56759]: https://github.com/rust-lang/rust/pull/56759/
2333 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2334 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2335 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2336 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2337 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2338 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2339 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2340 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2341 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2342 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2343 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2344 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2345 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2346 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2347 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2348 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2349 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2350 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2351 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2352 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2353 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2354 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2355 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2356 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2357 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2358 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2359 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2360 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2361 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2362 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2363 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2364 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2365 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2366 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2367 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2368 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2369 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2370 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2371 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2372 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2373 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2374 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2375 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2376 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2377 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2378 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2379 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2380 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2381 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2382 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2383 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2384 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2385 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2386 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2387 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2388 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2389 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2390 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2391 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2392 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2393 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2394 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2395 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2396 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2397 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2398 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2399 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2400 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2401 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2402 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2403 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2404 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2405 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2406 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2407 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2408 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2409 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2410 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2411 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2412 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2413 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2414 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2415 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2416 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2417 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2418 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2419 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2420 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2421 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2422 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2423 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2424 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2425 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2428 Version 1.31.1 (2018-12-20)
2429 ===========================
2431 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2432 - [Fix broken go-to-definition in RLS][rls/1171]
2433 - [Fix infinite loop on hover in RLS][rls/1170]
2435 [56562]: https://github.com/rust-lang/rust/pull/56562
2436 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2437 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2439 Version 1.31.0 (2018-12-06)
2440 ==========================
2444 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2445 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2446 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2447 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2449 - [You can now define and use `const` functions.][54835] These are currently
2450 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2451 [language reference][const-reference] for what exactly is available.
2452 - [You can now use tool lints, which allow you to scope lints from external
2453 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2454 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2455 a crate, not just in exported functions.][54451]
2456 - [You can now use parentheses in pattern matches.][54497]
2460 - [Updated musl to 1.1.20][54430]
2464 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2465 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2466 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2467 into `Option<&mut T>` using the `From` trait.][53218]
2468 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2473 - [`slice::align_to`]
2474 - [`slice::align_to_mut`]
2475 - [`slice::chunks_exact`]
2476 - [`slice::chunks_exact_mut`]
2477 - [`slice::rchunks`]
2478 - [`slice::rchunks_mut`]
2479 - [`slice::rchunks_exact`]
2480 - [`slice::rchunks_exact_mut`]
2481 - [`Option::replace`]
2485 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2486 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2487 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2489 [52813]: https://github.com/rust-lang/rust/pull/52813/
2490 [53218]: https://github.com/rust-lang/rust/pull/53218/
2491 [53555]: https://github.com/rust-lang/rust/issues/53555/
2492 [54057]: https://github.com/rust-lang/rust/pull/54057/
2493 [54240]: https://github.com/rust-lang/rust/pull/54240/
2494 [54430]: https://github.com/rust-lang/rust/pull/54430/
2495 [54451]: https://github.com/rust-lang/rust/pull/54451/
2496 [54497]: https://github.com/rust-lang/rust/pull/54497/
2497 [54778]: https://github.com/rust-lang/rust/pull/54778/
2498 [54835]: https://github.com/rust-lang/rust/pull/54835/
2499 [54870]: https://github.com/rust-lang/rust/pull/54870/
2500 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2501 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2502 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2503 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2504 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2505 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2506 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2507 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2508 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2509 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2510 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2511 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2512 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2513 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2515 Version 1.30.1 (2018-11-08)
2516 ===========================
2518 - [Fixed overflow ICE in rustdoc][54199]
2519 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2521 [54199]: https://github.com/rust-lang/rust/pull/54199
2522 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2524 Version 1.30.0 (2018-10-25)
2525 ==========================
2529 - [Procedural macros are now available.][52081] These kinds of macros allow for
2530 more powerful code generation. There is a [new chapter available][proc-macros]
2531 in the Rust Programming Language book that goes further in depth.
2532 - [You can now use keywords as identifiers using the raw identifiers
2533 syntax (`r#`),][53236] e.g. `let r#for = true;`
2534 - [Using anonymous parameters in traits is now deprecated with a warning and
2535 will be a hard error in the 2018 edition.][53272]
2536 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2537 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2538 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2539 Previously, using a external crate in a module without a use statement
2540 required `let json = ::serde_json::from_str(foo);` but can now be written
2541 as `let json = serde_json::from_str(foo);`.
2542 - [You can now apply the `#[used]` attribute to static items to prevent the
2543 compiler from optimising them away, even if they appear to be unused,][51363]
2544 e.g. `#[used] static FOO: u32 = 1;`
2545 - [You can now import and reexport macros from other crates with the `use`
2546 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2547 the root module of the crate. If your macro relies on calling other local
2548 macros, it is recommended to export with the
2549 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2551 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2552 using the `vis` specifier.][53370]
2553 - [Non-macro attributes now allow all forms of literals, not just
2554 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2555 write `#[attr(true)]`.
2556 - [You can now specify a function to handle a panic in the Rust runtime with the
2557 `#[panic_handler]` attribute.][51366]
2561 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2562 - [Added the `aarch64-unknown-netbsd` target][53165]
2566 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2570 - [`Ipv4Addr::BROADCAST`]
2571 - [`Ipv4Addr::LOCALHOST`]
2572 - [`Ipv4Addr::UNSPECIFIED`]
2573 - [`Ipv6Addr::LOCALHOST`]
2574 - [`Ipv6Addr::UNSPECIFIED`]
2575 - [`Iterator::find_map`]
2577 The following methods are replacement methods for `trim_left`, `trim_right`,
2578 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2580 - [`str::trim_end_matches`]
2582 - [`str::trim_start_matches`]
2583 - [`str::trim_start`]
2587 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2588 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2589 equivalent to calling `rustdoc --error-format=json`.
2590 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2594 - [`rustdoc` allows you to specify what edition to treat your code as with the
2595 `--edition` option.][54057]
2596 - [`rustdoc` now has the `--color` (specify whether to output color) and
2597 `--error-format` (specify error format, e.g. `json`) options.][53003]
2598 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2599 debug symbols.][53774]
2600 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2601 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2603 [50911]: https://github.com/rust-lang/rust/pull/50911/
2604 [51363]: https://github.com/rust-lang/rust/pull/51363/
2605 [51366]: https://github.com/rust-lang/rust/pull/51366/
2606 [52081]: https://github.com/rust-lang/rust/pull/52081/
2607 [53003]: https://github.com/rust-lang/rust/pull/53003/
2608 [53033]: https://github.com/rust-lang/rust/pull/53033/
2609 [53044]: https://github.com/rust-lang/rust/pull/53044/
2610 [53165]: https://github.com/rust-lang/rust/pull/53165/
2611 [53213]: https://github.com/rust-lang/rust/pull/53213/
2612 [53236]: https://github.com/rust-lang/rust/pull/53236/
2613 [53272]: https://github.com/rust-lang/rust/pull/53272/
2614 [53370]: https://github.com/rust-lang/rust/pull/53370/
2615 [53459]: https://github.com/rust-lang/rust/pull/53459/
2616 [53774]: https://github.com/rust-lang/rust/pull/53774/
2617 [53822]: https://github.com/rust-lang/rust/pull/53822/
2618 [54057]: https://github.com/rust-lang/rust/pull/54057/
2619 [54146]: https://github.com/rust-lang/rust/pull/54146/
2620 [54404]: https://github.com/rust-lang/rust/pull/54404/
2621 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2622 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2623 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2624 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2626 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2627 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2628 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2629 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2630 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2631 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2632 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2633 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2634 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2635 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2638 Version 1.29.2 (2018-10-11)
2639 ===========================
2641 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2642 - The `rls-preview` component on the windows-gnu targets has been restored.
2644 [54639]: https://github.com/rust-lang/rust/pull/54639
2647 Version 1.29.1 (2018-09-25)
2648 ===========================
2653 - The standard library's `str::repeat` function contained an out of bounds write
2654 caused by an integer overflow. This has been fixed by deterministically
2655 panicking when an overflow happens.
2657 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2661 Version 1.29.0 (2018-09-13)
2662 ==========================
2666 - [Bumped minimum LLVM version to 5.0.][51899]
2667 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2668 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2672 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2673 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2674 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2675 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2677 - [`Cell<T>` now allows `T` to be unsized.][50494]
2678 - [`SocketAddr` is now stable on Redox.][52656]
2683 - [`Iterator::flatten`]
2688 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2689 `--locked` to disable this behavior.
2690 - [`cargo-install` will now allow you to cross compile an install
2691 using `--target`.][cargo/5614]
2692 - [Added the `cargo-fix` subcommand to automatically move project code from
2693 2015 edition to 2018.][cargo/5723]
2694 - [`cargo doc` can now optionally document private types using the
2695 `--document-private-items` flag.][cargo/5543]
2699 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2700 the specified level to that level.][52354] For example `--cap-lints warn`
2701 will demote `deny` and `forbid` lints to `warn`.
2702 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2703 fails and `101` if there is a panic.][52197]
2704 - [A preview of clippy has been made available through rustup.][51122]
2705 You can install the preview with `rustup component add clippy-preview`.
2709 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2710 Use `str::get_unchecked(begin..end)` instead.
2711 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2712 Consider using the `home_dir` function from
2713 https://crates.io/crates/dirs instead.
2714 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2715 - [`cfg` attributes and `--cfg` command line flags are now more
2716 strictly validated.][53893]
2718 [53893]: https://github.com/rust-lang/rust/pull/53893/
2719 [52861]: https://github.com/rust-lang/rust/pull/52861/
2720 [52656]: https://github.com/rust-lang/rust/pull/52656/
2721 [52239]: https://github.com/rust-lang/rust/pull/52239/
2722 [52330]: https://github.com/rust-lang/rust/pull/52330/
2723 [52354]: https://github.com/rust-lang/rust/pull/52354/
2724 [52402]: https://github.com/rust-lang/rust/pull/52402/
2725 [52103]: https://github.com/rust-lang/rust/pull/52103/
2726 [52197]: https://github.com/rust-lang/rust/pull/52197/
2727 [51807]: https://github.com/rust-lang/rust/pull/51807/
2728 [51899]: https://github.com/rust-lang/rust/pull/51899/
2729 [51912]: https://github.com/rust-lang/rust/pull/51912/
2730 [51511]: https://github.com/rust-lang/rust/pull/51511/
2731 [51619]: https://github.com/rust-lang/rust/pull/51619/
2732 [51656]: https://github.com/rust-lang/rust/pull/51656/
2733 [51178]: https://github.com/rust-lang/rust/pull/51178/
2734 [51122]: https://github.com/rust-lang/rust/pull/51122
2735 [50494]: https://github.com/rust-lang/rust/pull/50494/
2736 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2737 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2738 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2739 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2740 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2741 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2742 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2745 Version 1.28.0 (2018-08-02)
2746 ===========================
2750 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2751 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2752 the inner type across Foreign Function Interface (FFI) boundaries.
2753 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2754 and can now be used as identifiers.][51196]
2755 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2756 stable.][51241] This will allow users to specify a global allocator for
2758 - [Unit test functions marked with the `#[test]` attribute can now return
2759 `Result<(), E: Debug>` in addition to `()`.][51298]
2760 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2761 allows macros to easily target lifetimes.
2765 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2766 prioritise making smaller binary sizes. `z` is the same as `s` with the
2767 exception that it does not vectorise loops, which typically results in an even
2769 - [The short error format is now stable.][49546] Specified with
2770 `--error-format=short` this option will provide a more compressed output of
2771 rust error messages.
2772 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2773 - [Reduced the number of allocations in the macro parser.][50855] This can
2774 improve compile times of macro heavy crates on average by 5%.
2778 - [Implemented `Default` for `&mut str`.][51306]
2779 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2780 - [Implemented `Extend` for `()`.][50234]
2781 - [The `Debug` implementation of `time::Duration` should now be more easily
2782 human readable.][50364] Previously a `Duration` of one second would printed as
2783 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2784 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2785 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2786 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2787 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2788 for `PathBuf`.][50170]
2789 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2790 and `Wrapping<i128>`.][50465]
2791 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2792 possible.][51050] This can provide up to a 40% speed increase.
2793 - [Improved error messages when using `format!`.][50610]
2797 - [`Iterator::step_by`]
2798 - [`Path::ancestors`]
2799 - [`SystemTime::UNIX_EPOCH`]
2800 - [`alloc::GlobalAlloc`]
2802 - [`alloc::LayoutErr`]
2805 - [`alloc::alloc_zeroed`]
2806 - [`alloc::dealloc`]
2807 - [`alloc::realloc`]
2808 - [`alloc::handle_alloc_error`]
2809 - [`btree_map::Entry::or_default`]
2810 - [`fmt::Alignment`]
2811 - [`hash_map::Entry::or_default`]
2812 - [`iter::repeat_with`]
2813 - [`num::NonZeroUsize`]
2814 - [`num::NonZeroU128`]
2815 - [`num::NonZeroU16`]
2816 - [`num::NonZeroU32`]
2817 - [`num::NonZeroU64`]
2818 - [`num::NonZeroU8`]
2819 - [`ops::RangeBounds`]
2820 - [`slice::SliceIndex`]
2821 - [`slice::from_mut`]
2822 - [`slice::from_ref`]
2823 - [`{Any + Send + Sync}::downcast_mut`]
2824 - [`{Any + Send + Sync}::downcast_ref`]
2825 - [`{Any + Send + Sync}::is`]
2829 - [Cargo will now no longer allow you to publish crates with build scripts that
2830 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2831 considered to be immutable.
2835 - [The `suggestion_applicability` field in `rustc`'s json output is now
2836 stable.][50486] This will allow dev tools to check whether a code suggestion
2837 would apply to them.
2841 - [Rust will consider trait objects with duplicated constraints to be the same
2842 type as without the duplicated constraint.][51276] For example the below code will
2843 now fail to compile.
2848 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2851 impl Trait + Send + Send {
2852 fn test(&self) { println!("two"); }
2856 [49546]: https://github.com/rust-lang/rust/pull/49546/
2857 [50143]: https://github.com/rust-lang/rust/pull/50143/
2858 [50170]: https://github.com/rust-lang/rust/pull/50170/
2859 [50234]: https://github.com/rust-lang/rust/pull/50234/
2860 [50265]: https://github.com/rust-lang/rust/pull/50265/
2861 [50364]: https://github.com/rust-lang/rust/pull/50364/
2862 [50385]: https://github.com/rust-lang/rust/pull/50385/
2863 [50465]: https://github.com/rust-lang/rust/pull/50465/
2864 [50486]: https://github.com/rust-lang/rust/pull/50486/
2865 [50554]: https://github.com/rust-lang/rust/pull/50554/
2866 [50610]: https://github.com/rust-lang/rust/pull/50610/
2867 [50855]: https://github.com/rust-lang/rust/pull/50855/
2868 [51050]: https://github.com/rust-lang/rust/pull/51050/
2869 [51196]: https://github.com/rust-lang/rust/pull/51196/
2870 [51200]: https://github.com/rust-lang/rust/pull/51200/
2871 [51241]: https://github.com/rust-lang/rust/pull/51241/
2872 [51276]: https://github.com/rust-lang/rust/pull/51276/
2873 [51298]: https://github.com/rust-lang/rust/pull/51298/
2874 [51306]: https://github.com/rust-lang/rust/pull/51306/
2875 [51562]: https://github.com/rust-lang/rust/pull/51562/
2876 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2877 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2878 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2879 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2880 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2881 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2882 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2883 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2884 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2885 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2886 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2887 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2888 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2889 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2890 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2891 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2892 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2893 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2894 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2895 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2896 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2897 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2898 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2899 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2900 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2901 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2902 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2903 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2904 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2905 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2907 Version 1.27.2 (2018-07-20)
2908 ===========================
2913 - The borrow checker was fixed to avoid potential unsoundness when using
2914 match ergonomics: [#52213][52213].
2916 [52213]: https://github.com/rust-lang/rust/issues/52213
2918 Version 1.27.1 (2018-07-10)
2919 ===========================
2924 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2925 when running, which enabled executing code as some other user on a
2926 given machine. This release fixes that vulnerability; you can read
2927 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2929 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2934 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2935 match ergonomics: [#51415][51415], [#49534][49534].
2937 [51415]: https://github.com/rust-lang/rust/issues/51415
2938 [49534]: https://github.com/rust-lang/rust/issues/49534
2939 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2940 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2942 Version 1.27.0 (2018-06-21)
2943 ==========================
2947 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2948 be used as an identifier.
2949 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2950 bare `Trait` syntax, and should make it clearer when being used in tandem with
2951 `impl Trait` because it is equivalent to the following syntax:
2952 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2953 `Box<Trait> == Box<dyn Trait>`.
2954 - [Attributes on generic parameters such as types and lifetimes are
2955 now stable.][48851] e.g.
2956 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2957 - [The `#[must_use]` attribute can now also be used on functions as well as
2958 types.][48925] It provides a lint that by default warns users when the
2959 value returned by a function has not been used.
2963 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2967 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2968 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2969 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2970 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2971 the `cfg` attribute.
2972 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2973 std are now available in core.][49896]
2974 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2976 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2977 that the operation isn't done in place.
2978 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2979 the `#[must_use]` attribute][49533] to warn about unused potentially
2980 expensive allocations.
2984 - [`DoubleEndedIterator::rfind`]
2985 - [`DoubleEndedIterator::rfold`]
2986 - [`DoubleEndedIterator::try_rfold`]
2987 - [`Duration::from_micros`]
2988 - [`Duration::from_nanos`]
2989 - [`Duration::subsec_micros`]
2990 - [`Duration::subsec_millis`]
2991 - [`HashMap::remove_entry`]
2992 - [`Iterator::try_fold`]
2993 - [`Iterator::try_for_each`]
2995 - [`Option::filter`]
2996 - [`String::replace_range`]
2997 - [`Take::set_limit`]
2998 - [`hint::unreachable_unchecked`]
2999 - [`os::unix::process::parent_id`]
3000 - [`ptr::swap_nonoverlapping`]
3001 - [`slice::rsplit_mut`]
3003 - [`slice::swap_with_slice`]
3007 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3008 `readme`, and `repository` fields.][cargo/5386]
3009 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3010 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3011 a different directory than `target` for placing compilation artifacts.
3012 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3013 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3014 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3015 where cargo would infer a binary, Cargo will produce a warning. You can
3016 disable this feature ahead of time by setting any of the following to false:
3017 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3018 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3019 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3023 - [Added “The Rustc book” into the official documentation.][49707]
3024 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3025 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3029 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3030 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3031 compile, `"".is_empty()` will still compile.
3032 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3033 will only print the inner type.][48553] E.g.
3034 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3035 not `AtomicBool(true)`.
3036 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3037 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3038 alignment should cover all use cases.
3039 - The `.description()` method on the `std::error::Error` trait
3040 [has been soft-deprecated][50163]. It is no longer required to implement it.
3042 [48553]: https://github.com/rust-lang/rust/pull/48553/
3043 [48851]: https://github.com/rust-lang/rust/pull/48851/
3044 [48925]: https://github.com/rust-lang/rust/pull/48925/
3045 [49533]: https://github.com/rust-lang/rust/pull/49533/
3046 [49623]: https://github.com/rust-lang/rust/pull/49623/
3047 [49630]: https://github.com/rust-lang/rust/pull/49630/
3048 [49664]: https://github.com/rust-lang/rust/pull/49664/
3049 [49699]: https://github.com/rust-lang/rust/pull/49699/
3050 [49707]: https://github.com/rust-lang/rust/pull/49707/
3051 [49719]: https://github.com/rust-lang/rust/pull/49719/
3052 [49896]: https://github.com/rust-lang/rust/pull/49896/
3053 [49968]: https://github.com/rust-lang/rust/pull/49968/
3054 [50163]: https://github.com/rust-lang/rust/pull/50163
3055 [50177]: https://github.com/rust-lang/rust/pull/50177/
3056 [50378]: https://github.com/rust-lang/rust/pull/50378/
3057 [50398]: https://github.com/rust-lang/rust/pull/50398/
3058 [50423]: https://github.com/rust-lang/rust/pull/50423/
3059 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3060 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3061 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3062 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3063 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3064 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3065 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3066 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3067 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3068 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3069 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3070 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3071 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3072 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3073 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3074 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3075 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3076 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3077 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3078 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3079 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3080 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3081 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3082 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3083 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3084 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3085 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3086 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3087 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3088 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3091 Version 1.26.2 (2018-06-05)
3092 ==========================
3097 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3099 [51117]: https://github.com/rust-lang/rust/issues/51117
3102 Version 1.26.1 (2018-05-29)
3103 ==========================
3108 - [RLS now works on Windows.][50646]
3109 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3115 - [`fn main() -> impl Trait` no longer works for non-Termination
3117 This reverts an accidental stabilization.
3118 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3119 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3121 [50646]: https://github.com/rust-lang/rust/issues/50646
3122 [50656]: https://github.com/rust-lang/rust/pull/50656
3123 [50812]: https://github.com/rust-lang/rust/pull/50812
3124 [50950]: https://github.com/rust-lang/rust/issues/50950
3125 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3127 Version 1.26.0 (2018-05-10)
3128 ==========================
3132 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3133 implement either or both traits.][49299]
3134 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3135 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3136 lifetime can be elided.][49458]
3137 - [`impl Trait` is now stable allowing you to have abstract types in returns
3138 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3139 `fn open(path: impl AsRef<Path>)`.
3140 - [Pattern matching will now automatically apply dereferences.][49394]
3141 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3142 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3143 - [A lot of operations are now available in a const context.][46882] E.g. You
3144 can now index into constant arrays, reference and dereference into constants,
3145 and use tuple struct constructors.
3146 - [Fixed entry slice patterns are now stable.][48516] E.g.
3148 let points = [1, 2, 3, 4];
3150 [1, 2, 3, 4] => println!("All points were sequential."),
3151 _ => println!("Not all points were sequential."),
3158 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3159 - [Fixed exponential projection complexity on nested types.][48296]
3160 This can provide up to a ~12% reduction in compile times for certain crates.
3161 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3162 to remap path prefixes outputted by the compiler.
3163 - [Added `powerpc-unknown-netbsd` target.][48281]
3167 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3168 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3169 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3170 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3171 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3172 - [`ascii::escape_default` is now available in libcore.][48735]
3173 - [Trailing commas are now supported in std and core macros.][48056]
3174 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3175 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3180 - [`*const T::copy_to_nonoverlapping`]
3181 - [`*const T::copy_to`]
3182 - [`*const T::read_unaligned`]
3183 - [`*const T::read_volatile`]
3184 - [`*const T::read`]
3186 - [`*const T::wrapping_add`]
3187 - [`*const T::wrapping_sub`]
3189 - [`*mut T::copy_to_nonoverlapping`]
3190 - [`*mut T::copy_to`]
3191 - [`*mut T::read_unaligned`]
3192 - [`*mut T::read_volatile`]
3194 - [`*mut T::replace`]
3197 - [`*mut T::wrapping_add`]
3198 - [`*mut T::wrapping_sub`]
3199 - [`*mut T::write_bytes`]
3200 - [`*mut T::write_unaligned`]
3201 - [`*mut T::write_volatile`]
3204 - [`FromUtf8Error::as_bytes`]
3205 - [`LocalKey::try_with`]
3206 - [`Option::cloned`]
3207 - [`btree_map::Entry::and_modify`]
3208 - [`fs::read_to_string`]
3211 - [`hash_map::Entry::and_modify`]
3212 - [`iter::FusedIterator`]
3213 - [`ops::RangeInclusive`]
3214 - [`ops::RangeToInclusive`]
3216 - [`slice::rotate_left`]
3217 - [`slice::rotate_right`]
3218 - [`String::retain`]
3223 - [Cargo will now output path to custom commands when `-v` is
3224 passed with `--list`][cargo/5041]
3225 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3229 - [The second edition of "The Rust Programming Language" book is now recommended
3230 over the first.][48404]
3235 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3236 syntax is now invalid.
3238 use std::ops::Fn as dyn;
3239 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3241 - [The result of dereferences are no longer promoted to `'static`.][47408]
3245 const PAIR: &(i32, i32) = &(0, 1);
3246 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3249 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3250 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3252 - [Removed hoedown from rustdoc.][48274]
3253 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3255 [46882]: https://github.com/rust-lang/rust/pull/46882
3256 [47379]: https://github.com/rust-lang/rust/pull/47379
3257 [47408]: https://github.com/rust-lang/rust/pull/47408
3258 [47813]: https://github.com/rust-lang/rust/pull/47813
3259 [48056]: https://github.com/rust-lang/rust/pull/48056
3260 [48125]: https://github.com/rust-lang/rust/pull/48125
3261 [48166]: https://github.com/rust-lang/rust/pull/48166
3262 [48235]: https://github.com/rust-lang/rust/pull/48235
3263 [48274]: https://github.com/rust-lang/rust/pull/48274
3264 [48281]: https://github.com/rust-lang/rust/pull/48281
3265 [48296]: https://github.com/rust-lang/rust/pull/48296
3266 [48326]: https://github.com/rust-lang/rust/pull/48326
3267 [48359]: https://github.com/rust-lang/rust/pull/48359
3268 [48404]: https://github.com/rust-lang/rust/pull/48404
3269 [48481]: https://github.com/rust-lang/rust/pull/48481
3270 [48516]: https://github.com/rust-lang/rust/pull/48516
3271 [48628]: https://github.com/rust-lang/rust/pull/48628
3272 [48629]: https://github.com/rust-lang/rust/pull/48629
3273 [48657]: https://github.com/rust-lang/rust/pull/48657
3274 [48735]: https://github.com/rust-lang/rust/pull/48735
3275 [48978]: https://github.com/rust-lang/rust/pull/48978
3276 [49101]: https://github.com/rust-lang/rust/pull/49101
3277 [49109]: https://github.com/rust-lang/rust/pull/49109
3278 [49121]: https://github.com/rust-lang/rust/pull/49121
3279 [49162]: https://github.com/rust-lang/rust/pull/49162
3280 [49184]: https://github.com/rust-lang/rust/pull/49184
3281 [49234]: https://github.com/rust-lang/rust/pull/49234
3282 [49255]: https://github.com/rust-lang/rust/pull/49255
3283 [49299]: https://github.com/rust-lang/rust/pull/49299
3284 [49305]: https://github.com/rust-lang/rust/pull/49305
3285 [49394]: https://github.com/rust-lang/rust/pull/49394
3286 [49458]: https://github.com/rust-lang/rust/pull/49458
3287 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3288 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3289 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3290 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3291 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3292 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3293 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3294 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3295 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3296 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3297 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3298 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3299 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3300 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3301 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3302 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3303 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3304 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3305 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3306 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3307 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3308 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3309 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3310 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3311 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3312 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3313 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3314 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3315 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3316 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3317 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3318 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3319 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3320 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3321 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3322 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3323 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3324 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3325 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3326 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3327 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3328 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3331 Version 1.25.0 (2018-03-29)
3332 ==========================
3336 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3337 - [You can now use nested groups of imports.][47948]
3338 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3339 - [You can now have `|` at the start of a match arm.][47947] e.g.
3341 enum Foo { A, B, C }
3347 | Foo::B => println!("AB"),
3348 | Foo::C => println!("C"),
3355 - [Upgraded to LLVM 6.][47828]
3356 - [Added `-C lto=val` option.][47521]
3357 - [Added `i586-unknown-linux-musl` target][47282]
3361 - [Impl Send for `process::Command` on Unix.][47760]
3362 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3363 - [`UnsafeCell::into_inner` is now safe.][47204]
3364 - [Implement libstd for CloudABI.][47268]
3365 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3366 - [Implement `AsRef<Path>` for Component][46985]
3367 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3368 - [Moved `Duration` to libcore.][46666]
3372 - [`Location::column`]
3375 The following functions can now be used in a constant expression.
3376 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3377 - [`Duration::new`][47300]
3378 - [`Duration::from_secs`][47300]
3379 - [`Duration::from_millis`][47300]
3383 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3384 - [`cargo new` now defaults to creating a binary crate, instead of a
3385 library crate.][cargo/5029]
3389 - [Rust by example is now shipped with new releases][46196]
3393 - [Deprecated `net::lookup_host`.][47510]
3394 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3395 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3396 around indexing operations (see [#47349][47349]). This has been fixed (which also
3397 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3398 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3400 [33903]: https://github.com/rust-lang/rust/pull/33903
3401 [47947]: https://github.com/rust-lang/rust/pull/47947
3402 [47948]: https://github.com/rust-lang/rust/pull/47948
3403 [47760]: https://github.com/rust-lang/rust/pull/47760
3404 [47790]: https://github.com/rust-lang/rust/pull/47790
3405 [47828]: https://github.com/rust-lang/rust/pull/47828
3406 [47398]: https://github.com/rust-lang/rust/pull/47398
3407 [47510]: https://github.com/rust-lang/rust/pull/47510
3408 [47521]: https://github.com/rust-lang/rust/pull/47521
3409 [47204]: https://github.com/rust-lang/rust/pull/47204
3410 [47251]: https://github.com/rust-lang/rust/pull/47251
3411 [47268]: https://github.com/rust-lang/rust/pull/47268
3412 [47282]: https://github.com/rust-lang/rust/pull/47282
3413 [47300]: https://github.com/rust-lang/rust/pull/47300
3414 [47349]: https://github.com/rust-lang/rust/pull/47349
3415 [46931]: https://github.com/rust-lang/rust/pull/46931
3416 [46985]: https://github.com/rust-lang/rust/pull/46985
3417 [47006]: https://github.com/rust-lang/rust/pull/47006
3418 [46830]: https://github.com/rust-lang/rust/pull/46830
3419 [46095]: https://github.com/rust-lang/rust/pull/46095
3420 [46666]: https://github.com/rust-lang/rust/pull/46666
3421 [46196]: https://github.com/rust-lang/rust/pull/46196
3422 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3423 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3424 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3425 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3426 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3429 Version 1.24.1 (2018-03-01)
3430 ==========================
3432 - [Do not abort when unwinding through FFI][48251]
3433 - [Emit UTF-16 files for linker arguments on Windows][48318]
3434 - [Make the error index generator work again][48308]
3435 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3437 [48251]: https://github.com/rust-lang/rust/issues/48251
3438 [48308]: https://github.com/rust-lang/rust/issues/48308
3439 [48318]: https://github.com/rust-lang/rust/issues/48318
3440 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3443 Version 1.24.0 (2018-02-15)
3444 ==========================
3448 - [External `sysv64` ffi is now available.][46528]
3449 eg. `extern "sysv64" fn foo () {}`
3453 - [rustc now uses 16 codegen units by default for release builds.][46910]
3454 For the fastest builds, utilize `codegen-units=1`.
3455 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3456 - [Add `aarch64-unknown-openbsd` support][46760]
3460 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3461 improvement in performance in the majority of cases.
3462 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3463 with Windows.][46798]
3464 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3465 - [impl `From<bool>` for `AtomicBool`][46293]
3466 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3467 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3468 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3469 - [float::from_bits now just uses transmute.][46012] This provides
3470 some optimisations from LLVM.
3471 - [Copied `AsciiExt` methods onto `char`][46077]
3472 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3473 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3474 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3475 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3479 - [`RefCell::replace`]
3481 - [`atomic::spin_loop_hint`]
3483 The following functions can now be used in a constant expression.
3484 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3486 - [`AtomicBool::new`][46287]
3487 - [`AtomicUsize::new`][46287]
3488 - [`AtomicIsize::new`][46287]
3489 - [`AtomicPtr::new`][46287]
3490 - [`Cell::new`][46287]
3491 - [`{integer}::min_value`][46287]
3492 - [`{integer}::max_value`][46287]
3493 - [`mem::size_of`][46287]
3494 - [`mem::align_of`][46287]
3495 - [`ptr::null`][46287]
3496 - [`ptr::null_mut`][46287]
3497 - [`RefCell::new`][46287]
3498 - [`UnsafeCell::new`][46287]
3502 - [Added a `workspace.default-members` config that
3503 overrides implied `--all` in virtual workspaces.][cargo/4743]
3504 - [Enable incremental by default on development builds.][cargo/4817] Also added
3505 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3506 per-project or global basis respectively.
3513 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3514 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3515 in accordance with IETF RFC 4291 §2.2.
3516 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3517 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3518 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3519 - [Leading zeros in tuple struct members is now an error][47084]
3520 - [`column!()` macro is one-based instead of zero-based][46977]
3521 - [`fmt::Arguments` can no longer be shared across threads][45198]
3522 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3523 - [Cargo sets a different working directory for the compiler][cargo/4788]
3525 [44884]: https://github.com/rust-lang/rust/pull/44884
3526 [45198]: https://github.com/rust-lang/rust/pull/45198
3527 [45506]: https://github.com/rust-lang/rust/pull/45506
3528 [45904]: https://github.com/rust-lang/rust/pull/45904
3529 [45990]: https://github.com/rust-lang/rust/pull/45990
3530 [46012]: https://github.com/rust-lang/rust/pull/46012
3531 [46077]: https://github.com/rust-lang/rust/pull/46077
3532 [46094]: https://github.com/rust-lang/rust/pull/46094
3533 [46284]: https://github.com/rust-lang/rust/pull/46284
3534 [46287]: https://github.com/rust-lang/rust/pull/46287
3535 [46293]: https://github.com/rust-lang/rust/pull/46293
3536 [46528]: https://github.com/rust-lang/rust/pull/46528
3537 [46671]: https://github.com/rust-lang/rust/pull/46671
3538 [46713]: https://github.com/rust-lang/rust/pull/46713
3539 [46735]: https://github.com/rust-lang/rust/pull/46735
3540 [46749]: https://github.com/rust-lang/rust/pull/46749
3541 [46760]: https://github.com/rust-lang/rust/pull/46760
3542 [46798]: https://github.com/rust-lang/rust/pull/46798
3543 [46828]: https://github.com/rust-lang/rust/pull/46828
3544 [46831]: https://github.com/rust-lang/rust/pull/46831
3545 [46833]: https://github.com/rust-lang/rust/pull/46833
3546 [46910]: https://github.com/rust-lang/rust/pull/46910
3547 [46977]: https://github.com/rust-lang/rust/pull/46977
3548 [47018]: https://github.com/rust-lang/rust/pull/47018
3549 [47080]: https://github.com/rust-lang/rust/pull/47080
3550 [47084]: https://github.com/rust-lang/rust/pull/47084
3551 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3552 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3553 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3554 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3555 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3556 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3559 Version 1.23.0 (2018-01-04)
3560 ==========================
3564 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3565 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3566 Which should fix some confusing errors in some operations.
3570 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3571 undefined behavior.][45920]
3572 - [rustc now suggests renaming import if names clash.][45660]
3573 - [Display errors/warnings correctly when there are zero-width or
3574 wide characters.][45711]
3575 - [rustc now avoids unnecessary copies of arguments that are
3576 simple bindings][45380] This should improve memory usage on average by 5-10%.
3577 - [Updated musl used to build musl rustc to 1.1.17][45393]
3581 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3582 - [Implement Hash for raw pointers to unsized types][45483]
3583 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3584 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3585 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3586 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3587 and `<*mut T>::as_mut`][44932]
3588 - [Optimized `Thread::{park, unpark}` implementation][45524]
3589 - [Improved `SliceExt::binary_search` performance.][45333]
3590 - [impl `FromIterator<()>` for `()`][45379]
3591 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3599 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3600 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3601 - [Added unit test checking to `cargo check`][cargo/4592]
3602 - [Cargo now lets you install a specific version
3603 using `cargo install --version`][cargo/4637]
3607 - [Releases now ship with the Cargo book documentation.][45692]
3608 - [rustdoc now prints rendering warnings on every run.][45324]
3612 - [Changes have been made to type equality to make it more correct,
3613 in rare cases this could break some code.][45853] [Tracking issue for
3614 further information][45852]
3615 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3616 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3617 Android 9, the minimum supported version is Android 14.
3618 - [Bumped the minimum LLVM to 3.9][45326]
3620 [44042]: https://github.com/rust-lang/rust/pull/44042
3621 [44932]: https://github.com/rust-lang/rust/pull/44932
3622 [45267]: https://github.com/rust-lang/rust/pull/45267
3623 [45324]: https://github.com/rust-lang/rust/pull/45324
3624 [45326]: https://github.com/rust-lang/rust/pull/45326
3625 [45333]: https://github.com/rust-lang/rust/pull/45333
3626 [45379]: https://github.com/rust-lang/rust/pull/45379
3627 [45380]: https://github.com/rust-lang/rust/pull/45380
3628 [45393]: https://github.com/rust-lang/rust/pull/45393
3629 [45435]: https://github.com/rust-lang/rust/pull/45435
3630 [45483]: https://github.com/rust-lang/rust/pull/45483
3631 [45524]: https://github.com/rust-lang/rust/pull/45524
3632 [45571]: https://github.com/rust-lang/rust/pull/45571
3633 [45580]: https://github.com/rust-lang/rust/pull/45580
3634 [45610]: https://github.com/rust-lang/rust/pull/45610
3635 [45660]: https://github.com/rust-lang/rust/pull/45660
3636 [45692]: https://github.com/rust-lang/rust/pull/45692
3637 [45711]: https://github.com/rust-lang/rust/pull/45711
3638 [45772]: https://github.com/rust-lang/rust/pull/45772
3639 [45852]: https://github.com/rust-lang/rust/issues/45852
3640 [45853]: https://github.com/rust-lang/rust/pull/45853
3641 [45887]: https://github.com/rust-lang/rust/pull/45887
3642 [45920]: https://github.com/rust-lang/rust/pull/45920
3643 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3644 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3645 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3648 Version 1.22.1 (2017-11-22)
3649 ==========================
3651 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3653 [46183]: https://github.com/rust-lang/rust/pull/46183
3655 Version 1.22.0 (2017-11-22)
3656 ==========================
3660 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3661 - [Now accepts underscores in unicode escapes][43716]
3662 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3663 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3667 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3668 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3669 This should decrease compile times for debug builds.
3670 - [strict memory alignment now enabled on ARMv6][45094]
3671 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3675 - [Allow atomic operations up to 32 bits
3676 on `armv5te_unknown_linux_gnueabi`][44978]
3677 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3678 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3679 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3680 - [Properly detect overflow in `Instant += Duration`.][44220]
3681 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3682 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3683 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3690 - [Cargo will now build multi file examples in subdirectories of the `examples`
3691 folder that have a `main.rs` file.][cargo/4496]
3692 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3693 the old format will continue to work and can be updated with `cargo update`.
3694 - [Now supports vendoring git repositories][cargo/3992]
3698 - [`libbacktrace` is now available on Apple platforms.][44251]
3699 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3700 This now lets you specify that a given code example will fail to compile.
3704 - [The minimum Android version that rustc can build for has been bumped
3705 to `4.0` from `2.3`][45656]
3706 - [Allowing `T op= &T` for numeric types has broken some type
3707 inference cases][45480]
3710 [42526]: https://github.com/rust-lang/rust/pull/42526
3711 [43017]: https://github.com/rust-lang/rust/pull/43017
3712 [43716]: https://github.com/rust-lang/rust/pull/43716
3713 [43949]: https://github.com/rust-lang/rust/pull/43949
3714 [44015]: https://github.com/rust-lang/rust/pull/44015
3715 [44220]: https://github.com/rust-lang/rust/pull/44220
3716 [44251]: https://github.com/rust-lang/rust/pull/44251
3717 [44287]: https://github.com/rust-lang/rust/pull/44287
3718 [44303]: https://github.com/rust-lang/rust/pull/44303
3719 [44456]: https://github.com/rust-lang/rust/pull/44456
3720 [44466]: https://github.com/rust-lang/rust/pull/44466
3721 [44895]: https://github.com/rust-lang/rust/pull/44895
3722 [44966]: https://github.com/rust-lang/rust/pull/44966
3723 [44978]: https://github.com/rust-lang/rust/pull/44978
3724 [45041]: https://github.com/rust-lang/rust/pull/45041
3725 [45064]: https://github.com/rust-lang/rust/pull/45064
3726 [45075]: https://github.com/rust-lang/rust/pull/45075
3727 [45094]: https://github.com/rust-lang/rust/pull/45094
3728 [45095]: https://github.com/rust-lang/rust/pull/45095
3729 [45480]: https://github.com/rust-lang/rust/issues/45480
3730 [45656]: https://github.com/rust-lang/rust/pull/45656
3731 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3732 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3733 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3740 Version 1.21.0 (2017-10-12)
3741 ==========================
3745 - [You can now use static references for literals.][43838]
3749 let x: &'static u32 = &0;
3752 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3755 my_macro!(Vec<i32>::new); // Always worked
3756 my_macro!(Vec::<i32>::new); // Now works
3761 - [Upgraded jemalloc to 4.5.0][43911]
3762 - [Enabled unwinding panics on Redox][43917]
3763 - [Now runs LLVM in parallel during translation phase.][43506]
3764 This should reduce peak memory usage.
3768 - [Generate builtin impls for `Clone` for all arrays and tuples that
3769 are `T: Clone`][43690]
3770 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3771 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3772 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3777 [`std::mem::discriminant`]
3781 - [You can now call `cargo install` with multiple package names][cargo/4216]
3782 - [Cargo commands inside a virtual workspace will now implicitly
3783 pass `--all`][cargo/4335]
3784 - [Added a `[patch]` section to `Cargo.toml` to handle
3785 prepublication dependencies][cargo/4123] [RFC 1969]
3786 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3787 like patterns][cargo/4270]
3788 - [Added the `--all-targets` option][cargo/4400]
3789 - [Using required dependencies as a feature is now deprecated and emits
3790 a warning][cargo/4364]
3795 - [Cargo docs are moving][43916]
3796 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3797 - [The rustdoc book is now available][43863]
3798 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3799 - [Added a preview of RLS has been made available through rustup][44204]
3800 Install with `rustup component add rls-preview`
3801 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3802 Previously only showed `std::os::unix`.
3806 - [Changes in method matching against higher-ranked types][43880] This may cause
3807 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3808 - [rustc's JSON error output's byte position start at top of file.][42973]
3809 Was previously relative to the rustc's internal `CodeMap` struct which
3810 required the unstable library `libsyntax` to correctly use.
3811 - [`unused_results` lint no longer ignores booleans][43728]
3813 [42565]: https://github.com/rust-lang/rust/pull/42565
3814 [42973]: https://github.com/rust-lang/rust/pull/42973
3815 [43348]: https://github.com/rust-lang/rust/pull/43348
3816 [43459]: https://github.com/rust-lang/rust/pull/43459
3817 [43506]: https://github.com/rust-lang/rust/pull/43506
3818 [43540]: https://github.com/rust-lang/rust/pull/43540
3819 [43690]: https://github.com/rust-lang/rust/pull/43690
3820 [43728]: https://github.com/rust-lang/rust/pull/43728
3821 [43838]: https://github.com/rust-lang/rust/pull/43838
3822 [43863]: https://github.com/rust-lang/rust/pull/43863
3823 [43880]: https://github.com/rust-lang/rust/pull/43880
3824 [43911]: https://github.com/rust-lang/rust/pull/43911
3825 [43916]: https://github.com/rust-lang/rust/pull/43916
3826 [43917]: https://github.com/rust-lang/rust/pull/43917
3827 [44204]: https://github.com/rust-lang/rust/pull/44204
3828 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3829 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3830 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3831 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3832 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3833 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3834 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3835 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3836 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3838 Version 1.20.0 (2017-08-31)
3839 ===========================
3843 - [Associated constants are now stabilised.][42809]
3844 - [A lot of macro bugs are now fixed.][42913]
3849 - [Struct fields are now properly coerced to the expected field type.][42807]
3850 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3851 `wasm32-experimental-emscripten` target.
3852 - [Changed some of the error messages to be more helpful.][42033]
3853 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3855 - [rustc now reports the total number of errors on compilation failure][43015]
3856 previously this was only the number of errors in the pass that failed.
3857 - [Expansion in rustc has been sped up 29x.][42533]
3858 - [added `msp430-none-elf` target.][43099]
3859 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3861 - [Fixes backtraces on Redox][43228]
3862 - [rustc now identifies different versions of same crate when absolute paths of
3863 different types match in an error message.][42826]
3869 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3870 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3872 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3873 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3874 - [Impl `Clone` for `DefaultHasher`.][42799]
3875 - [Impl `Sync` for `SyncSender`.][42397]
3876 - [Impl `FromStr` for `char`][42271]
3877 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3879 - [allow messages in the `unimplemented!()` macro.][42155]
3880 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3881 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3882 - [Upgrade to Unicode 10.0.0][42999]
3883 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3884 - [Skip the main thread's manual stack guard on Linux][43072]
3885 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3886 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3888 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3893 - [`CStr::into_c_string`]
3894 - [`CString::as_c_str`]
3895 - [`CString::into_boxed_c_str`]
3896 - [`Chain::get_mut`]
3897 - [`Chain::get_ref`]
3898 - [`Chain::into_inner`]
3899 - [`Option::get_or_insert_with`]
3900 - [`Option::get_or_insert`]
3901 - [`OsStr::into_os_string`]
3902 - [`OsString::into_boxed_os_str`]
3905 - [`Utf8Error::error_len`]
3906 - [`char::EscapeDebug`]
3907 - [`char::escape_debug`]
3908 - [`compile_error!`]
3909 - [`f32::from_bits`]
3911 - [`f64::from_bits`]
3913 - [`mem::ManuallyDrop`]
3914 - [`slice::sort_unstable_by_key`]
3915 - [`slice::sort_unstable_by`]
3916 - [`slice::sort_unstable`]
3917 - [`str::from_boxed_utf8_unchecked`]
3918 - [`str::as_bytes_mut`]
3919 - [`str::as_bytes_mut`]
3920 - [`str::from_utf8_mut`]
3921 - [`str::from_utf8_unchecked_mut`]
3923 - [`str::get_unchecked_mut`]
3924 - [`str::get_unchecked`]
3926 - [`str::into_boxed_bytes`]
3931 - [Cargo API token location moved from `~/.cargo/config` to
3932 `~/.cargo/credentials`.][cargo/3978]
3933 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3934 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3935 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3936 - [You can now specify version of a binary when installed through
3937 `cargo install` using `--vers`.][cargo/4229]
3938 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3939 failure.][cargo/4248]
3940 - [Changed the convention around which file is the crate root.][cargo/4259]
3941 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3942 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3947 - [Functions with `'static` in their return types will now not be as usable as
3948 if they were using lifetime parameters instead.][42417]
3949 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3950 takes the sign of NaN into account where previously didn't.][42430]
3952 [42033]: https://github.com/rust-lang/rust/pull/42033
3953 [42155]: https://github.com/rust-lang/rust/pull/42155
3954 [42271]: https://github.com/rust-lang/rust/pull/42271
3955 [42397]: https://github.com/rust-lang/rust/pull/42397
3956 [42417]: https://github.com/rust-lang/rust/pull/42417
3957 [42430]: https://github.com/rust-lang/rust/pull/42430
3958 [42431]: https://github.com/rust-lang/rust/pull/42431
3959 [42533]: https://github.com/rust-lang/rust/pull/42533
3960 [42571]: https://github.com/rust-lang/rust/pull/42571
3961 [42613]: https://github.com/rust-lang/rust/pull/42613
3962 [42799]: https://github.com/rust-lang/rust/pull/42799
3963 [42807]: https://github.com/rust-lang/rust/pull/42807
3964 [42809]: https://github.com/rust-lang/rust/pull/42809
3965 [42822]: https://github.com/rust-lang/rust/pull/42822
3966 [42826]: https://github.com/rust-lang/rust/pull/42826
3967 [42854]: https://github.com/rust-lang/rust/pull/42854
3968 [42913]: https://github.com/rust-lang/rust/pull/42913
3969 [42999]: https://github.com/rust-lang/rust/pull/42999
3970 [43011]: https://github.com/rust-lang/rust/pull/43011
3971 [43015]: https://github.com/rust-lang/rust/pull/43015
3972 [43072]: https://github.com/rust-lang/rust/pull/43072
3973 [43077]: https://github.com/rust-lang/rust/pull/43077
3974 [43097]: https://github.com/rust-lang/rust/pull/43097
3975 [43099]: https://github.com/rust-lang/rust/pull/43099
3976 [43170]: https://github.com/rust-lang/rust/pull/43170
3977 [43178]: https://github.com/rust-lang/rust/pull/43178
3978 [43185]: https://github.com/rust-lang/rust/pull/43185
3979 [43228]: https://github.com/rust-lang/rust/pull/43228
3980 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3981 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3982 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3983 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3984 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3985 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3986 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3987 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3988 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3989 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3990 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3991 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3992 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3993 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3994 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3995 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3996 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3997 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3998 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3999 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4000 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4001 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4002 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4003 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4004 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4005 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4006 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4007 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4008 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4009 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4010 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4011 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4012 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4013 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4014 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4015 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4016 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4017 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4018 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4021 Version 1.19.0 (2017-07-20)
4022 ===========================
4027 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4028 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4029 - [Macro recursion limit increased to 1024 from 64.][41676]
4030 - [Added lint for detecting unused macros.][41907]
4031 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4032 For example: `let x = loop { break 7; };`
4033 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4034 contain `Copy` types and cannot have a `Drop` implementation.
4035 Example: `union Foo { bar: u8, baz: usize }`
4036 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4037 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4042 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4043 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4044 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4045 you should use `--target armv7-linux-androideabi`.
4046 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4047 - [Minor optimisation of string operations.][42037]
4048 - [Compiler error message is now `aborting due to previous error(s)` instead of
4049 `aborting due to N previous errors`][42150] This was previously inaccurate and
4050 would only count certain kinds of errors.
4051 - [The compiler now supports Visual Studio 2017][42225]
4052 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4053 - [Added a lot][42264] of [new error codes][42302]
4054 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4055 libraries with C Run-time Libraries(CRT) to be statically linked.
4056 - [Fixed various ARM codegen bugs][42740]
4061 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4062 `Extend<Cow<'a, str>>`][41449]
4063 - [`Vec` now implements `From<&mut [T]>`][41530]
4064 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4065 - [`SplitWhitespace` now implements `Clone`][41659]
4066 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4068 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4069 macros, but for printing to stderr.
4074 - [`OsString::shrink_to_fit`]
4077 - [`thread::ThreadId`]
4082 - [Build scripts can now add environment variables to the environment
4083 the crate is being compiled in.
4084 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4085 - [Subcommands now replace the current process rather than spawning a new
4086 child process][cargo/3970]
4087 - [Workspace members can now accept glob file patterns][cargo/3979]
4088 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4089 the members in a given workspace.][cargo/3988]
4090 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4091 - [Target directory path is now in the cargo metadata][cargo/4022]
4092 - [Cargo no longer checks out a local working directory for the
4093 crates.io index][cargo/4026] This should provide smaller file size for the
4094 registry, and improve cloning times, especially on Windows machines.
4095 - [Added an `--exclude` option for excluding certain packages when using the
4096 `--all` option][cargo/4031]
4097 - [Cargo will now automatically retry when receiving a 5xx error
4098 from crates.io][cargo/4032]
4099 - [The `--features` option now accepts multiple comma or space
4100 delimited values.][cargo/4084]
4101 - [Added support for custom target specific runners][cargo/3954]
4106 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4108 - [Rust will now release XZ compressed packages][rust-installer/57]
4109 - [rustup will now prefer to download rust packages with
4110 XZ compression][rustup/1100] over GZip packages.
4111 - [Added the ability to escape `#` in rust documentation][41785] By adding
4112 additional `#`'s ie. `##` is now `#`
4117 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4118 - [`-Z` flags are now no longer allowed to be used on the stable
4119 compiler.][41751] This has been a warning for a year previous to this.
4120 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4121 longer works][42844]. Users should migrate to the built-in `check`
4122 command, which has been available since 1.16.
4123 - [Ending a float literal with `._` is now a hard error.
4124 Example: `42._` .][41946]
4125 - [Any use of a private `extern crate` outside of its module is now a
4126 hard error.][36886] This was previously a warning.
4127 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4128 relative while the `::` prefix makes a path absolute, but was ignored and the
4129 path was relative regardless.
4130 - [Floating point constants in match patterns is now a hard error][36890]
4131 This was previously a warning.
4132 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4133 match patterns is now a hard error][36891] This was previously a warning.
4134 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4136 - [From the pound escape, lines consisting of multiple `#`s are
4138 - [It is an error to re-export private enum variants][42460]. This is
4139 known to break a number of crates that depend on an older version of
4141 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4142 to use it to find the linker, and the build will fail where it did
4143 not previously][42607]
4145 [36886]: https://github.com/rust-lang/rust/issues/36886
4146 [36888]: https://github.com/rust-lang/rust/issues/36888
4147 [36890]: https://github.com/rust-lang/rust/issues/36890
4148 [36891]: https://github.com/rust-lang/rust/issues/36891
4149 [36892]: https://github.com/rust-lang/rust/issues/36892
4150 [37406]: https://github.com/rust-lang/rust/issues/37406
4151 [39983]: https://github.com/rust-lang/rust/pull/39983
4152 [41145]: https://github.com/rust-lang/rust/pull/41145
4153 [41192]: https://github.com/rust-lang/rust/pull/41192
4154 [41258]: https://github.com/rust-lang/rust/pull/41258
4155 [41370]: https://github.com/rust-lang/rust/pull/41370
4156 [41449]: https://github.com/rust-lang/rust/pull/41449
4157 [41530]: https://github.com/rust-lang/rust/pull/41530
4158 [41624]: https://github.com/rust-lang/rust/pull/41624
4159 [41656]: https://github.com/rust-lang/rust/pull/41656
4160 [41659]: https://github.com/rust-lang/rust/pull/41659
4161 [41676]: https://github.com/rust-lang/rust/pull/41676
4162 [41751]: https://github.com/rust-lang/rust/pull/41751
4163 [41764]: https://github.com/rust-lang/rust/pull/41764
4164 [41785]: https://github.com/rust-lang/rust/pull/41785
4165 [41873]: https://github.com/rust-lang/rust/pull/41873
4166 [41907]: https://github.com/rust-lang/rust/pull/41907
4167 [41946]: https://github.com/rust-lang/rust/pull/41946
4168 [42016]: https://github.com/rust-lang/rust/pull/42016
4169 [42037]: https://github.com/rust-lang/rust/pull/42037
4170 [42068]: https://github.com/rust-lang/rust/pull/42068
4171 [42150]: https://github.com/rust-lang/rust/pull/42150
4172 [42162]: https://github.com/rust-lang/rust/pull/42162
4173 [42225]: https://github.com/rust-lang/rust/pull/42225
4174 [42264]: https://github.com/rust-lang/rust/pull/42264
4175 [42302]: https://github.com/rust-lang/rust/pull/42302
4176 [42460]: https://github.com/rust-lang/rust/issues/42460
4177 [42607]: https://github.com/rust-lang/rust/issues/42607
4178 [42740]: https://github.com/rust-lang/rust/pull/42740
4179 [42844]: https://github.com/rust-lang/rust/issues/42844
4180 [42948]: https://github.com/rust-lang/rust/pull/42948
4181 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4182 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4183 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4184 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4185 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4186 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4187 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4188 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4189 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4190 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4191 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4192 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4193 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4194 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4195 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4196 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4197 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4198 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4199 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4200 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4201 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4202 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4205 Version 1.18.0 (2017-06-08)
4206 ===========================
4211 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4212 make the item visible to just that module tree. Also accepts the keyword
4213 `crate` to make something public to the whole crate but not users of the
4214 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4215 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4216 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4217 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4218 types like `Write + Send`, trailing `+` are now supported in trait objects,
4219 and better error reporting for trait objects starting with `?Sized`.
4220 - [0e+10 is now a valid floating point literal][40589]
4221 - [Now warns if you bind a lifetime parameter to 'static][40734]
4222 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4223 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4224 representation in some cases.][40377]
4229 - [rustc can now emit mir with `--emit mir`][39891]
4230 - [Improved LLVM IR for trivial functions][40367]
4231 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4232 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4233 opportunities found through profiling
4234 - [Improved backtrace formatting when panicking][38165]
4239 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4240 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4241 iteration or reallocation.
4242 - [Simplified HashMap Bucket interface][40561] provides performance
4243 improvements for iterating and cloning.
4244 - [Specialize Vec::from_elem to use calloc][40409]
4245 - [Fixed Race condition in fs::create_dir_all][39799]
4246 - [No longer caching stdio on Windows][40516]
4247 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4248 2.50%~ faster and in one case now 12.50% faster.
4249 - [Optimized `AtomicBool::fetch_nand`][41143]
4254 - [`Child::try_wait`]
4255 - [`HashMap::retain`]
4256 - [`HashSet::retain`]
4258 - [`TcpStream::peek`]
4259 - [`UdpSocket::peek`]
4260 - [`UdpSocket::peek_from`]
4265 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4266 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4267 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4268 - [Added Android build support][cargo/3885]
4269 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4270 of a certain type, for example `cargo build --bins` will build all
4272 - [Added support for haiku][cargo/3952]
4277 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4278 - [Added rust-windbg script for better debugging on Windows][39983]
4279 - [Rust now uses the official cross compiler for NetBSD][40612]
4280 - [rustdoc now accepts `#` at the start of files][40828]
4281 - [Fixed jemalloc support for musl][41168]
4286 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4287 always placed after the sign if it exists and before the digits. With the `#`
4288 flag the zeroes are placed after the prefix and before the digits.
4289 - [Due to the struct field optimisation][40377], using `transmute` on structs
4290 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4291 always been undefined behavior, but is now more likely to break in practice.
4292 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4293 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4294 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4295 - [Overlapping inherent `impl`s are now a hard error][40728]
4296 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4297 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4298 `out.asm` and `out.ll` instead of only one of the filetypes.
4299 - [ calling a function that returns `Self` will no longer work][41805] when
4300 the size of `Self` cannot be statically determined.
4301 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4302 this has caused a few regressions namely:
4304 - Changed the link order of local static/dynamic libraries (respecting the
4305 order on given rather than having the compiler reorder).
4306 - Changed how MinGW is linked, native code linked to dynamic libraries
4307 may require manually linking to the gcc support library (for the native
4310 [38165]: https://github.com/rust-lang/rust/pull/38165
4311 [39799]: https://github.com/rust-lang/rust/pull/39799
4312 [39891]: https://github.com/rust-lang/rust/pull/39891
4313 [39983]: https://github.com/rust-lang/rust/pull/39983
4314 [40043]: https://github.com/rust-lang/rust/pull/40043
4315 [40241]: https://github.com/rust-lang/rust/pull/40241
4316 [40338]: https://github.com/rust-lang/rust/pull/40338
4317 [40367]: https://github.com/rust-lang/rust/pull/40367
4318 [40377]: https://github.com/rust-lang/rust/pull/40377
4319 [40409]: https://github.com/rust-lang/rust/pull/40409
4320 [40516]: https://github.com/rust-lang/rust/pull/40516
4321 [40556]: https://github.com/rust-lang/rust/pull/40556
4322 [40561]: https://github.com/rust-lang/rust/pull/40561
4323 [40589]: https://github.com/rust-lang/rust/pull/40589
4324 [40612]: https://github.com/rust-lang/rust/pull/40612
4325 [40723]: https://github.com/rust-lang/rust/pull/40723
4326 [40728]: https://github.com/rust-lang/rust/pull/40728
4327 [40731]: https://github.com/rust-lang/rust/pull/40731
4328 [40734]: https://github.com/rust-lang/rust/pull/40734
4329 [40805]: https://github.com/rust-lang/rust/pull/40805
4330 [40807]: https://github.com/rust-lang/rust/pull/40807
4331 [40828]: https://github.com/rust-lang/rust/pull/40828
4332 [40870]: https://github.com/rust-lang/rust/pull/40870
4333 [41085]: https://github.com/rust-lang/rust/pull/41085
4334 [41143]: https://github.com/rust-lang/rust/pull/41143
4335 [41168]: https://github.com/rust-lang/rust/pull/41168
4336 [41270]: https://github.com/rust-lang/rust/issues/41270
4337 [41469]: https://github.com/rust-lang/rust/pull/41469
4338 [41805]: https://github.com/rust-lang/rust/issues/41805
4339 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4340 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4341 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4342 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4343 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4344 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4345 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4346 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4347 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4348 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4349 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4350 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4351 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4352 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4355 Version 1.17.0 (2017-04-27)
4356 ===========================
4361 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4362 * [Fields of structs may be initialized without duplicating the field/variable
4363 names][39761]. [RFC 1682]
4364 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4365 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4366 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4367 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4368 `'b`. Soundness fix.
4369 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4370 * [Static variables may contain references to other statics][40027]
4375 * [Exit quickly on only `--emit dep-info`][40336]
4376 * [Make `-C relocation-model` more correctly determine whether the linker
4377 creates a position-independent executable][40245]
4378 * [Add `-C overflow-checks` to directly control whether integer overflow
4380 * [The rustc type checker now checks items on demand instead of in a single
4381 in-order pass][40008]. This is mostly an internal refactoring in support of
4382 future work, including incremental type checking, but also resolves [RFC
4383 1647], allowing `Self` to appear in `impl` `where` clauses.
4384 * [Optimize vtable loads][39995]
4385 * [Turn off vectorization for Emscripten targets][39990]
4386 * [Provide suggestions for unknown macros imported with `use`][39953]
4387 * [Fix ICEs in path resolution][39939]
4388 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4389 * [Add clearer error message using `&str + &str`][39116]
4400 * [`Ordering::then`]
4401 * [`Ordering::then_with`]
4402 * [`BTreeMap::range`]
4403 * [`BTreeMap::range_mut`]
4404 * [`collections::Bound`]
4405 * [`process::abort`]
4406 * [`ptr::read_unaligned`]
4407 * [`ptr::write_unaligned`]
4408 * [`Result::expect_err`]
4411 * [`Cell::into_inner`]
4417 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4418 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4419 * [`String` implements `FromIterator<&char>`][40028]
4420 * `Box` [implements][40009] a number of new conversions:
4421 `From<Box<str>> for String`,
4422 `From<Box<[T]>> for Vec<T>`,
4423 `From<Box<CStr>> for CString`,
4424 `From<Box<OsStr>> for OsString`,
4425 `From<Box<Path>> for PathBuf`,
4426 `Into<Box<str>> for String`,
4427 `Into<Box<[T]>> for Vec<T>`,
4428 `Into<Box<CStr>> for CString`,
4429 `Into<Box<OsStr>> for OsString`,
4430 `Into<Box<Path>> for PathBuf`,
4431 `Default for Box<str>`,
4432 `Default for Box<CStr>`,
4433 `Default for Box<OsStr>`,
4434 `From<&CStr> for Box<CStr>`,
4435 `From<&OsStr> for Box<OsStr>`,
4436 `From<&Path> for Box<Path>`
4437 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4438 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4439 * [Slightly optimize `slice::sort`][39538]
4440 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4441 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4442 `Box<str>` implements `From<&str>`][39438]
4443 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4444 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4445 * [`format!` estimates the needed capacity before writing a string][39356]
4446 * [Support unprivileged symlink creation in Windows][38921]
4447 * [`PathBuf` implements `Default`][38764]
4448 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4449 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4450 and poor hash functions.
4455 * [Add `cargo check --all`][cargo/3731]
4456 * [Add an option to ignore SSL revocation checking][cargo/3699]
4457 * [Add `cargo run --package`][cargo/3691]
4458 * [Add `required_features`][cargo/3667]
4459 * [Assume `build.rs` is a build script][cargo/3664]
4460 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4465 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4467 * [The "Unstable Book" documents nightly-only features][ubook]
4468 * [Improve the style of the sidebar in rustdoc output][40265]
4469 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4470 * [Fix MSP430 breakage due to `i128`][40257]
4471 * [Preliminary Solaris/SPARCv9 support][39903]
4472 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4473 run without installing the MSVC runtime.
4474 * [`rustdoc --test` includes file names in test names][39788]
4475 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4476 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4477 * [Initial support for `aarch64-unknown-freebsd`][39491]
4478 * [Initial support for `i686-unknown-netbsd`][39426]
4479 * [This release no longer includes the old makefile build system][39431]. Rust
4480 is built with a custom build system, written in Rust, and with Cargo.
4481 * [Add Debug implementations for libcollection structs][39002]
4482 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4483 * [`--test-threads=0` produces an error][38945]
4484 * [`rustup` installs documentation by default][40526]
4485 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4486 WinDbg and Visual Studio to improve the debugging experience.
4491 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4492 workaround, either use MSVC 2015 or run vcvars.bat.
4493 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4494 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4495 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4497 * [`format!` and `Display::to_string` panic if an underlying formatting
4498 implementation returns an error][40117]. Previously the error was silently
4499 ignored. It is incorrect for `write_fmt` to return an error when writing
4501 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4502 crates were marked stable and could be accessed from the stable toolchain.
4503 * [Rust git source no longer includes vendored crates][39728]. Those that need
4504 to build with vendored crates should build from release tarballs.
4505 * [Fix inert attributes from `proc_macro_derives`][39572]
4506 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4507 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4509 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4510 existing code generally ignores the type of dead-code unless a type-hint is
4511 provided; this can cause surprising inference interactions particularly around
4512 defaulting. The new code uniformly ignores the result type of dead-code.
4513 * [Tuple-struct constructors with private fields are no longer visible][38932]
4514 * [Lifetime parameters that do not appear in the arguments are now considered
4515 early-bound][38897], resolving a soundness bug (#[32330]). The
4516 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4518 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4519 * [Make transmuting from fn item types to pointer-sized types a hard
4522 [27787]: https://github.com/rust-lang/rust/issues/27787
4523 [32330]: https://github.com/rust-lang/rust/issues/32330
4524 [34198]: https://github.com/rust-lang/rust/pull/34198
4525 [38161]: https://github.com/rust-lang/rust/pull/38161
4526 [38368]: https://github.com/rust-lang/rust/pull/38368
4527 [38584]: https://github.com/rust-lang/rust/issues/38584
4528 [38661]: https://github.com/rust-lang/rust/pull/38661
4529 [38764]: https://github.com/rust-lang/rust/pull/38764
4530 [38864]: https://github.com/rust-lang/rust/issues/38864
4531 [38897]: https://github.com/rust-lang/rust/pull/38897
4532 [38921]: https://github.com/rust-lang/rust/pull/38921
4533 [38932]: https://github.com/rust-lang/rust/pull/38932
4534 [38945]: https://github.com/rust-lang/rust/pull/38945
4535 [38981]: https://github.com/rust-lang/rust/pull/38981
4536 [39002]: https://github.com/rust-lang/rust/pull/39002
4537 [39116]: https://github.com/rust-lang/rust/pull/39116
4538 [39193]: https://github.com/rust-lang/rust/pull/39193
4539 [39265]: https://github.com/rust-lang/rust/pull/39265
4540 [39356]: https://github.com/rust-lang/rust/pull/39356
4541 [39372]: https://github.com/rust-lang/rust/pull/39372
4542 [39426]: https://github.com/rust-lang/rust/pull/39426
4543 [39431]: https://github.com/rust-lang/rust/pull/39431
4544 [39438]: https://github.com/rust-lang/rust/pull/39438
4545 [39440]: https://github.com/rust-lang/rust/pull/39440
4546 [39485]: https://github.com/rust-lang/rust/pull/39485
4547 [39491]: https://github.com/rust-lang/rust/pull/39491
4548 [39518]: https://github.com/rust-lang/rust/pull/39518
4549 [39538]: https://github.com/rust-lang/rust/pull/39538
4550 [39572]: https://github.com/rust-lang/rust/pull/39572
4551 [39633]: https://github.com/rust-lang/rust/pull/39633
4552 [39642]: https://github.com/rust-lang/rust/pull/39642
4553 [39728]: https://github.com/rust-lang/rust/pull/39728
4554 [39761]: https://github.com/rust-lang/rust/pull/39761
4555 [39788]: https://github.com/rust-lang/rust/pull/39788
4556 [39793]: https://github.com/rust-lang/rust/pull/39793
4557 [39837]: https://github.com/rust-lang/rust/pull/39837
4558 [39843]: https://github.com/rust-lang/rust/pull/39843
4559 [39851]: https://github.com/rust-lang/rust/pull/39851
4560 [39903]: https://github.com/rust-lang/rust/pull/39903
4561 [39939]: https://github.com/rust-lang/rust/pull/39939
4562 [39953]: https://github.com/rust-lang/rust/pull/39953
4563 [39960]: https://github.com/rust-lang/rust/pull/39960
4564 [39990]: https://github.com/rust-lang/rust/pull/39990
4565 [39995]: https://github.com/rust-lang/rust/pull/39995
4566 [40008]: https://github.com/rust-lang/rust/pull/40008
4567 [40009]: https://github.com/rust-lang/rust/pull/40009
4568 [40027]: https://github.com/rust-lang/rust/pull/40027
4569 [40028]: https://github.com/rust-lang/rust/pull/40028
4570 [40037]: https://github.com/rust-lang/rust/pull/40037
4571 [40117]: https://github.com/rust-lang/rust/pull/40117
4572 [40166]: https://github.com/rust-lang/rust/pull/40166
4573 [40245]: https://github.com/rust-lang/rust/pull/40245
4574 [40257]: https://github.com/rust-lang/rust/pull/40257
4575 [40261]: https://github.com/rust-lang/rust/pull/40261
4576 [40265]: https://github.com/rust-lang/rust/pull/40265
4577 [40319]: https://github.com/rust-lang/rust/pull/40319
4578 [40336]: https://github.com/rust-lang/rust/pull/40336
4579 [40526]: https://github.com/rust-lang/rust/pull/40526
4580 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4581 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4582 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4583 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4584 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4585 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4586 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4587 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4588 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4589 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4590 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4591 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4592 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4593 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4594 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4595 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4596 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4597 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4598 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4599 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4600 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4601 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4602 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4603 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4604 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4605 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4606 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4607 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4608 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4609 [mdbook]: https://crates.io/crates/mdbook
4610 [ubook]: https://doc.rust-lang.org/unstable-book/
4613 Version 1.16.0 (2017-03-16)
4614 ===========================
4619 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4620 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4621 match patterns][38069]
4622 * [Clean up semantics of `self` in an import list][38313]
4623 * [`Self` may appear in `impl` headers][38920]
4624 * [`Self` may appear in struct expressions][39282]
4629 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4630 a `.rmeta` file containing only crate metadata][38571]. This can be
4631 used by tools like the Rust Language Service to perform
4632 metadata-only builds.
4633 * [Levenshtein based typo suggestions now work in most places, while
4634 previously they worked only for fields and sometimes for local
4635 variables][38927]. Together with the overhaul of "no
4636 resolution"/"unexpected resolution" errors (#[38154]) they result in
4637 large and systematic improvement in resolution diagnostics.
4638 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4640 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4641 * [`rustc` no longer attempts to provide "consider using an explicit
4642 lifetime" suggestions][37057]. They were inaccurate.
4647 * [`VecDeque::truncate`]
4648 * [`VecDeque::resize`]
4649 * [`String::insert_str`]
4650 * [`Duration::checked_add`]
4651 * [`Duration::checked_sub`]
4652 * [`Duration::checked_div`]
4653 * [`Duration::checked_mul`]
4656 * [`SocketAddr::is_ipv4`]
4657 * [`SocketAddr::is_ipv6`]
4658 * [`IpAddr::is_ipv4`]
4659 * [`IpAddr::is_ipv6`]
4661 * [`Vec::dedup_by_key`]
4662 * [`Result::unwrap_or_default`]
4663 * [`<*const T>::wrapping_offset`]
4664 * [`<*mut T>::wrapping_offset`]
4665 * `CommandExt::creation_flags`
4666 * [`File::set_permissions`]
4667 * [`String::split_off`]
4672 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4673 their argument by `Borrow` parameter][37761]
4674 * [All public types in std implement `Debug`][38006]
4675 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4676 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4677 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4679 * [std: Fix partial writes in `LineWriter`][38062]
4680 * [std: Clamp max read/write sizes on Unix][38062]
4681 * [Use more specific panic message for `&str` slicing errors][38066]
4682 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4683 functionality cannot be achieved in std currently.
4684 * [`writeln!`, like `println!`, now accepts a form with no string
4685 or formatting arguments, to just print a newline][38469]
4686 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4687 * [Reduce the size of static data in `std_unicode::tables`][38781]
4688 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4689 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4691 * [`Duration` implements `Sum`][38712]
4692 * [`String` implements `ToSocketAddrs`][39048]
4697 * [The `cargo check` command does a type check of a project without
4698 building it][cargo/3296]
4699 * [crates.io will display CI badges from Travis and AppVeyor, if
4700 specified in Cargo.toml][cargo/3546]
4701 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4702 * [Compilation profiles accept integer values for `debug`, in addition
4703 to `true` and `false`. These are passed to `rustc` as the value to
4704 `-C debuginfo`][cargo/3534]
4705 * [Implement `cargo --version --verbose`][cargo/3604]
4706 * [All builds now output 'dep-info' build dependencies compatible with
4707 make and ninja][cargo/3557]
4708 * [Build all workspace members with `build --all`][cargo/3511]
4709 * [Document all workspace members with `doc --all`][cargo/3515]
4710 * [Path deps outside workspace are not members][cargo/3443]
4715 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4716 the path to the Rust implementation][38589]
4717 * [The `armv7-linux-androideabi` target no longer enables NEON
4718 extensions, per Google's ABI guide][38413]
4719 * [The stock standard library can be compiled for Redox OS][38401]
4720 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4722 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4724 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4729 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4730 match patterns][38069]
4731 * In this release, references to uninhabited types can not be
4732 pattern-matched. This was accidentally allowed in 1.15.
4733 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4734 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4736 * [Clean up semantics of `self` in an import list][38313]
4737 * Reimplemented lifetime elision. This change was almost entirely compatible
4738 with existing code, but it did close a number of small bugs and loopholes,
4739 as well as being more accepting in some other [cases][41105].
4741 [37057]: https://github.com/rust-lang/rust/pull/37057
4742 [37761]: https://github.com/rust-lang/rust/pull/37761
4743 [38006]: https://github.com/rust-lang/rust/pull/38006
4744 [38051]: https://github.com/rust-lang/rust/pull/38051
4745 [38062]: https://github.com/rust-lang/rust/pull/38062
4746 [38062]: https://github.com/rust-lang/rust/pull/38622
4747 [38066]: https://github.com/rust-lang/rust/pull/38066
4748 [38069]: https://github.com/rust-lang/rust/pull/38069
4749 [38131]: https://github.com/rust-lang/rust/pull/38131
4750 [38154]: https://github.com/rust-lang/rust/pull/38154
4751 [38274]: https://github.com/rust-lang/rust/pull/38274
4752 [38304]: https://github.com/rust-lang/rust/pull/38304
4753 [38313]: https://github.com/rust-lang/rust/pull/38313
4754 [38314]: https://github.com/rust-lang/rust/pull/38314
4755 [38327]: https://github.com/rust-lang/rust/pull/38327
4756 [38401]: https://github.com/rust-lang/rust/pull/38401
4757 [38413]: https://github.com/rust-lang/rust/pull/38413
4758 [38469]: https://github.com/rust-lang/rust/pull/38469
4759 [38559]: https://github.com/rust-lang/rust/pull/38559
4760 [38571]: https://github.com/rust-lang/rust/pull/38571
4761 [38580]: https://github.com/rust-lang/rust/pull/38580
4762 [38589]: https://github.com/rust-lang/rust/pull/38589
4763 [38670]: https://github.com/rust-lang/rust/pull/38670
4764 [38712]: https://github.com/rust-lang/rust/pull/38712
4765 [38726]: https://github.com/rust-lang/rust/pull/38726
4766 [38781]: https://github.com/rust-lang/rust/pull/38781
4767 [38798]: https://github.com/rust-lang/rust/pull/38798
4768 [38909]: https://github.com/rust-lang/rust/pull/38909
4769 [38920]: https://github.com/rust-lang/rust/pull/38920
4770 [38927]: https://github.com/rust-lang/rust/pull/38927
4771 [39048]: https://github.com/rust-lang/rust/pull/39048
4772 [39282]: https://github.com/rust-lang/rust/pull/39282
4773 [39379]: https://github.com/rust-lang/rust/pull/39379
4774 [41105]: https://github.com/rust-lang/rust/issues/41105
4775 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4776 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4777 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4778 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4779 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4780 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4781 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4782 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4783 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4784 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4785 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4786 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4787 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4788 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4789 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4790 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4791 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4792 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4793 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4794 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4795 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4796 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4797 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4798 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4799 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4800 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4801 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4802 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4803 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4804 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4807 Version 1.15.1 (2017-02-09)
4808 ===========================
4810 * [Fix IntoIter::as_mut_slice's signature][39466]
4811 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4813 [39466]: https://github.com/rust-lang/rust/pull/39466
4814 [39523]: https://github.com/rust-lang/rust/pull/39523
4817 Version 1.15.0 (2017-02-02)
4818 ===========================
4823 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4824 stable. This allows popular code-generating crates like Serde and Diesel to
4825 work ergonomically. [RFC 1681].
4826 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4827 with curly braces][36868]. Part of [RFC 1506].
4828 * [A number of minor changes to name resolution have been activated][37127].
4829 They add up to more consistent semantics, allowing for future evolution of
4830 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4831 details of what is different. The breaking changes here have been transitioned
4832 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4833 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4835 * [`?Sized` can be used in `where` clauses][37791]
4836 * [There is now a limit on the size of monomorphized types and it can be
4837 modified with the `#![type_size_limit]` crate attribute, similarly to
4838 the `#![recursion_limit]` attribute][37789]
4843 * [On Windows, the compiler will apply dllimport attributes when linking to
4844 extern functions][37973]. Additional attributes and flags can control which
4845 library kind is linked and its name. [RFC 1717].
4846 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4847 * [The `--test` flag works with procedural macro crates][38107]
4848 * [Fix `extern "aapcs" fn` ABI][37814]
4849 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4850 * [The `format!` expander recognizes incorrect `printf` and shell-style
4851 formatting directives and suggests the correct format][37613].
4852 * [Only report one error for all unused imports in an import list][37456]
4854 Compiler Performance
4855 --------------------
4857 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4858 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4859 * [Don't clone in `UnificationTable::probe`][37848]
4860 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4861 * [Use small vectors in type walker][37760]
4862 * [Macro expansion performance was improved][37701]
4863 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4864 * [Replace FNV with a faster hash function][37229]
4869 * [`std::iter::Iterator::min_by`]
4870 * [`std::iter::Iterator::max_by`]
4871 * [`std::os::*::fs::FileExt`]
4872 * [`std::sync::atomic::Atomic*::get_mut`]
4873 * [`std::sync::atomic::Atomic*::into_inner`]
4874 * [`std::vec::IntoIter::as_slice`]
4875 * [`std::vec::IntoIter::as_mut_slice`]
4876 * [`std::sync::mpsc::Receiver::try_iter`]
4877 * [`std::os::unix::process::CommandExt::before_exec`]
4878 * [`std::rc::Rc::strong_count`]
4879 * [`std::rc::Rc::weak_count`]
4880 * [`std::sync::Arc::strong_count`]
4881 * [`std::sync::Arc::weak_count`]
4882 * [`std::char::encode_utf8`]
4883 * [`std::char::encode_utf16`]
4884 * [`std::cell::Ref::clone`]
4885 * [`std::io::Take::into_inner`]
4890 * [The standard sorting algorithm has been rewritten for dramatic performance
4891 improvements][38192]. It is a hybrid merge sort, drawing influences from
4892 Timsort. Previously it was a naive merge sort.
4893 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4894 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4896 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4897 and `char_indices().last()`][37882]
4898 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4899 * [Chinese characters display correctly in `fmt::Debug`][37855]
4900 * [Derive `Default` for `Duration`][37699]
4901 * [Support creation of anonymous pipes on WinXP/2k][37677]
4902 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4903 * [Don't pass overlapped handles to processes][38835]
4908 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4909 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4910 should instead check the variable at runtime with `std::env`. That the value
4911 was set at build time was a bug, and incorrect when cross-compiling. This
4912 change is known to cause breakage.
4913 * [Add `--all` flag to `cargo test`][cargo/3221]
4914 * [Compile statically against the MSVC CRT][cargo/3363]
4915 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4916 * [Link OpenSSL statically on OSX][cargo/3311]
4917 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4918 * [Test for bad path overrides with summaries][cargo/3336]
4919 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4920 * [Fix retrying crate downloads for network errors][cargo/3348]
4921 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4922 * [Emit more info on --message-format=json][cargo/3319]
4923 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4924 * [Don't ignore errors in workspace manifest][cargo/3409]
4925 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4930 * [Test runners (binaries built with `--test`) now support a `--list` argument
4931 that lists the tests it contains][38185]
4932 * [Test runners now support a `--exact` argument that makes the test filter
4933 match exactly, instead of matching only a substring of the test name][38181]
4934 * [rustdoc supports a `--playground-url` flag][37763]
4935 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4940 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4941 continue to be used in this release by passing `--disable-rustbuild` to the
4942 configure script, but they will be deleted soon. Note that the new build
4943 system uses a different on-disk layout that will likely affect any scripts
4945 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4947 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4948 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4954 * [A number of minor changes to name resolution have been activated][37127].
4955 They add up to more consistent semantics, allowing for future evolution of
4956 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4957 details of what is different. The breaking changes here have been transitioned
4958 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4959 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4960 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4961 should instead check the variable at runtime with `std::env`. That the value
4962 was set at build time was a bug, and incorrect when cross-compiling. This
4963 change is known to cause breakage.
4964 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4965 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4966 1.10 and is now an error by default. It will become a hard error in the near
4968 * [The semantics relating modules to file system directories are changing in
4969 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4970 lint, which is a warning in this release, and will become a hard error in the
4972 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4973 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4974 the underlying iterator][37834]
4976 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4977 [33685]: https://github.com/rust-lang/rust/issues/33685
4978 [36868]: https://github.com/rust-lang/rust/pull/36868
4979 [37127]: https://github.com/rust-lang/rust/pull/37127
4980 [37229]: https://github.com/rust-lang/rust/pull/37229
4981 [37456]: https://github.com/rust-lang/rust/pull/37456
4982 [37527]: https://github.com/rust-lang/rust/pull/37527
4983 [37602]: https://github.com/rust-lang/rust/pull/37602
4984 [37613]: https://github.com/rust-lang/rust/pull/37613
4985 [37615]: https://github.com/rust-lang/rust/pull/37615
4986 [37636]: https://github.com/rust-lang/rust/pull/37636
4987 [37627]: https://github.com/rust-lang/rust/pull/37627
4988 [37642]: https://github.com/rust-lang/rust/pull/37642
4989 [37677]: https://github.com/rust-lang/rust/pull/37677
4990 [37699]: https://github.com/rust-lang/rust/pull/37699
4991 [37701]: https://github.com/rust-lang/rust/pull/37701
4992 [37705]: https://github.com/rust-lang/rust/pull/37705
4993 [37749]: https://github.com/rust-lang/rust/pull/37749
4994 [37760]: https://github.com/rust-lang/rust/pull/37760
4995 [37763]: https://github.com/rust-lang/rust/pull/37763
4996 [37764]: https://github.com/rust-lang/rust/pull/37764
4997 [37789]: https://github.com/rust-lang/rust/pull/37789
4998 [37791]: https://github.com/rust-lang/rust/pull/37791
4999 [37814]: https://github.com/rust-lang/rust/pull/37814
5000 [37817]: https://github.com/rust-lang/rust/pull/37817
5001 [37834]: https://github.com/rust-lang/rust/pull/37834
5002 [37848]: https://github.com/rust-lang/rust/pull/37848
5003 [37855]: https://github.com/rust-lang/rust/pull/37855
5004 [37882]: https://github.com/rust-lang/rust/pull/37882
5005 [37888]: https://github.com/rust-lang/rust/pull/37888
5006 [37973]: https://github.com/rust-lang/rust/pull/37973
5007 [37979]: https://github.com/rust-lang/rust/pull/37979
5008 [38086]: https://github.com/rust-lang/rust/pull/38086
5009 [38107]: https://github.com/rust-lang/rust/pull/38107
5010 [38117]: https://github.com/rust-lang/rust/pull/38117
5011 [38134]: https://github.com/rust-lang/rust/pull/38134
5012 [38146]: https://github.com/rust-lang/rust/pull/38146
5013 [38181]: https://github.com/rust-lang/rust/pull/38181
5014 [38182]: https://github.com/rust-lang/rust/pull/38182
5015 [38185]: https://github.com/rust-lang/rust/pull/38185
5016 [38192]: https://github.com/rust-lang/rust/pull/38192
5017 [38279]: https://github.com/rust-lang/rust/pull/38279
5018 [38835]: https://github.com/rust-lang/rust/pull/38835
5019 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5020 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5021 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5022 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5023 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5024 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5025 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5026 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5027 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5028 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5029 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5030 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5031 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5032 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5033 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5034 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5035 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5036 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5037 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5038 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5039 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5040 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5041 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5042 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5043 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5044 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5045 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5046 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5047 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5048 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5049 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5050 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5051 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5052 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5053 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5054 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5055 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5056 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5059 Version 1.14.0 (2016-12-22)
5060 ===========================
5065 * [`..` matches multiple tuple fields in enum variants, structs
5066 and tuples][36843]. [RFC 1492].
5067 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5068 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5069 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5070 dereferencing][36822]
5075 * [Mark enums with non-zero discriminant as non-zero][37224]
5076 * [Lower-case `static mut` names are linted like other
5077 statics and consts][37162]
5078 * [Fix ICE on some macros in const integer positions
5079 (e.g. `[u8; m!()]`)][36819]
5080 * [Improve error message and snippet for "did you mean `x`"][36798]
5081 * [Add a panic-strategy field to the target specification][36794]
5082 * [Include LLVM version in `--version --verbose`][37200]
5084 Compile-time Optimizations
5085 --------------------------
5087 * [Improve macro expansion performance][37569]
5088 * [Shrink `Expr_::ExprInlineAsm`][37445]
5089 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5090 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5091 * [Avoid more allocations when compiling html5ever][37373]
5092 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5093 * [Avoid some allocations in the macro parser][37318]
5094 * [Use a faster deflate setting][37298]
5095 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5096 during interning of slices][37270]
5097 * [Optimize `write_metadata`][37267]
5098 * [Don't process obligation forest cycles when stalled][37231]
5099 * [Avoid many `CrateConfig` clones][37161]
5100 * [Optimize `Substs::super_fold_with`][37108]
5101 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5102 * [Speed up `plug_leaks`][36917]
5107 * [`println!()`, with no arguments, prints newline][36825].
5108 Previously, an empty string was required to achieve the same.
5109 * [`Wrapping` impls standard binary and unary operators, as well as
5110 the `Sum` and `Product` iterators][37356]
5111 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5113 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5114 `VecDeque` iterators][37315]
5115 * [Improve `SipHasher` performance on small values][37312]
5116 * [Add Iterator trait TrustedLen to enable better FromIterator /
5118 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5119 * [`ReadDir` implements `Debug`][37221]
5120 * [Implement `RefUnwindSafe` for atomic types][37178]
5121 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5122 * [Avoid allocations in `Decoder::read_str`][37064]
5123 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5124 * [Impl `Debug` for raw pointers to unsized data][36880]
5125 * [Don't reuse `HashMap` random seeds][37470]
5126 * [The internal memory layout of `HashMap` is more cache-friendly, for
5127 significant improvements in some operations][36692]
5128 * [`HashMap` uses less memory on 32-bit architectures][36595]
5129 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5134 * [Expose rustc cfg values to build scripts][cargo/3243]
5135 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5136 * [Fix passing --features when testing multiple packages][cargo/3280]
5137 * [Use a single profile set per workspace][cargo/3249]
5138 * [Load `replace` sections from lock files][cargo/3220]
5139 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5144 * [rustup is the recommended Rust installation method][1.14rustup]
5145 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5146 S390x. These are [tier 2] platforms and may have major defects. Follow the
5147 instructions on the website to install, or add the targets to an existing
5148 installation with `rustup target add`. The new target triples are:
5149 - `mips-unknown-linux-gnu`
5150 - `mipsel-unknown-linux-gnu`
5151 - `mips64-unknown-linux-gnuabi64`
5152 - `mips64el-unknown-linux-gnuabi64 `
5153 - `powerpc-unknown-linux-gnu`
5154 - `powerpc64-unknown-linux-gnu`
5155 - `powerpc64le-unknown-linux-gnu`
5156 - `s390x-unknown-linux-gnu `
5157 * This release includes target (std) builds for ARM Linux running MUSL
5158 libc. These are [tier 2] platforms and may have major defects. Add the
5159 following triples to an existing rustup installation with `rustup target add`:
5160 - `arm-unknown-linux-musleabi`
5161 - `arm-unknown-linux-musleabihf`
5162 - `armv7-unknown-linux-musleabihf`
5163 * This release includes [experimental support for WebAssembly][1.14wasm], via
5164 the `wasm32-unknown-emscripten` target. This target is known to have major
5165 defects. Please test, report, and fix.
5166 * rustup no longer installs documentation by default. Run `rustup
5167 component add rust-docs` to install.
5168 * [Fix line stepping in debugger][37310]
5169 * [Enable line number debuginfo in releases][37280]
5174 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5175 * [Add support for Fuchsia OS][37313]
5176 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5181 * [A number of forward-compatibility lints used by the compiler
5182 to gradually introduce language changes have been converted
5183 to deny by default][36894]:
5184 - ["use of inaccessible extern crate erroneously allowed"][36886]
5185 - ["type parameter default erroneously allowed in invalid location"][36887]
5186 - ["detects super or self keywords at the beginning of global path"][36888]
5187 - ["two overlapping inherent impls define an item with the same name
5188 were erroneously allowed"][36889]
5189 - ["floating-point constants cannot be used in patterns"][36890]
5190 - ["constants of struct or enum type can only be used in a pattern if
5191 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5192 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5193 * [Prohibit patterns in trait methods without bodies][37378]
5194 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5195 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5196 * [The `$crate` macro variable is accepted in fewer locations][37213]
5197 * [Impls specifying extra region requirements beyond the trait
5198 they implement are rejected][37167]
5199 * [Enums may not be unsized][37111]. Unsized enums are intended to
5200 work but never have. For now they are forbidden.
5201 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5203 [tier 2]: https://forge.rust-lang.org/platform-support.html
5204 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5205 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5206 [36430]: https://github.com/rust-lang/rust/pull/36430
5207 [36595]: https://github.com/rust-lang/rust/pull/36595
5208 [36595]: https://github.com/rust-lang/rust/pull/36595
5209 [36692]: https://github.com/rust-lang/rust/pull/36692
5210 [36767]: https://github.com/rust-lang/rust/pull/36767
5211 [36794]: https://github.com/rust-lang/rust/pull/36794
5212 [36798]: https://github.com/rust-lang/rust/pull/36798
5213 [36819]: https://github.com/rust-lang/rust/pull/36819
5214 [36822]: https://github.com/rust-lang/rust/pull/36822
5215 [36825]: https://github.com/rust-lang/rust/pull/36825
5216 [36843]: https://github.com/rust-lang/rust/pull/36843
5217 [36880]: https://github.com/rust-lang/rust/pull/36880
5218 [36886]: https://github.com/rust-lang/rust/issues/36886
5219 [36887]: https://github.com/rust-lang/rust/issues/36887
5220 [36888]: https://github.com/rust-lang/rust/issues/36888
5221 [36889]: https://github.com/rust-lang/rust/issues/36889
5222 [36890]: https://github.com/rust-lang/rust/issues/36890
5223 [36891]: https://github.com/rust-lang/rust/issues/36891
5224 [36892]: https://github.com/rust-lang/rust/issues/36892
5225 [36894]: https://github.com/rust-lang/rust/pull/36894
5226 [36917]: https://github.com/rust-lang/rust/pull/36917
5227 [36993]: https://github.com/rust-lang/rust/pull/36993
5228 [37037]: https://github.com/rust-lang/rust/pull/37037
5229 [37064]: https://github.com/rust-lang/rust/pull/37064
5230 [37094]: https://github.com/rust-lang/rust/pull/37094
5231 [37108]: https://github.com/rust-lang/rust/pull/37108
5232 [37111]: https://github.com/rust-lang/rust/pull/37111
5233 [37161]: https://github.com/rust-lang/rust/pull/37161
5234 [37162]: https://github.com/rust-lang/rust/pull/37162
5235 [37167]: https://github.com/rust-lang/rust/pull/37167
5236 [37178]: https://github.com/rust-lang/rust/pull/37178
5237 [37200]: https://github.com/rust-lang/rust/pull/37200
5238 [37213]: https://github.com/rust-lang/rust/pull/37213
5239 [37221]: https://github.com/rust-lang/rust/pull/37221
5240 [37224]: https://github.com/rust-lang/rust/pull/37224
5241 [37230]: https://github.com/rust-lang/rust/pull/37230
5242 [37231]: https://github.com/rust-lang/rust/pull/37231
5243 [37247]: https://github.com/rust-lang/rust/pull/37247
5244 [37267]: https://github.com/rust-lang/rust/pull/37267
5245 [37270]: https://github.com/rust-lang/rust/pull/37270
5246 [37273]: https://github.com/rust-lang/rust/pull/37273
5247 [37280]: https://github.com/rust-lang/rust/pull/37280
5248 [37298]: https://github.com/rust-lang/rust/pull/37298
5249 [37306]: https://github.com/rust-lang/rust/pull/37306
5250 [37310]: https://github.com/rust-lang/rust/pull/37310
5251 [37312]: https://github.com/rust-lang/rust/pull/37312
5252 [37313]: https://github.com/rust-lang/rust/pull/37313
5253 [37315]: https://github.com/rust-lang/rust/pull/37315
5254 [37318]: https://github.com/rust-lang/rust/pull/37318
5255 [37322]: https://github.com/rust-lang/rust/pull/37322
5256 [37326]: https://github.com/rust-lang/rust/pull/37326
5257 [37351]: https://github.com/rust-lang/rust/pull/37351
5258 [37356]: https://github.com/rust-lang/rust/pull/37356
5259 [37367]: https://github.com/rust-lang/rust/pull/37367
5260 [37373]: https://github.com/rust-lang/rust/pull/37373
5261 [37378]: https://github.com/rust-lang/rust/pull/37378
5262 [37389]: https://github.com/rust-lang/rust/pull/37389
5263 [37392]: https://github.com/rust-lang/rust/pull/37392
5264 [37427]: https://github.com/rust-lang/rust/pull/37427
5265 [37439]: https://github.com/rust-lang/rust/pull/37439
5266 [37445]: https://github.com/rust-lang/rust/pull/37445
5267 [37470]: https://github.com/rust-lang/rust/pull/37470
5268 [37569]: https://github.com/rust-lang/rust/pull/37569
5269 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5270 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5271 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5272 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5273 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5274 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5275 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5278 Version 1.13.0 (2016-11-10)
5279 ===========================
5284 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5285 errors, like the `try!` macro, described in [RFC 0243].
5286 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5287 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5288 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5289 * [Fix lifetime rules for 'if' conditions][36029]
5290 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5295 * [Add the `-C link-arg` argument][36574]
5296 * [Remove the old AST-based backend from rustc_trans][35764]
5297 * [Don't enable NEON by default on armv7 Linux][35814]
5298 * [Fix debug line number info for macro expansions][35238]
5299 * [Do not emit "class method" debuginfo for types that are not
5300 DICompositeType][36008]
5301 * [Warn about multiple conflicting #[repr] hints][34623]
5302 * [When sizing DST, don't double-count nested struct prefixes][36351]
5303 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5304 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5305 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5306 * [Expand macros without recursing to avoid stack overflows][36214]
5311 * [Replace macro backtraces with labeled local uses][35702]
5312 * [Improve error message for misplaced doc comments][33922]
5313 * [Buffer unix and lock windows to prevent message interleaving][35975]
5314 * [Update lifetime errors to specifically note temporaries][36171]
5315 * [Special case a few colors for Windows][36178]
5316 * [Suggest `use self` when such an import resolves][36289]
5317 * [Be more specific when type parameter shadows primitive type][36338]
5318 * Many minor improvements
5320 Compile-time Optimizations
5321 --------------------------
5323 * [Compute and cache HIR hashes at beginning][35854]
5324 * [Don't hash types in loan paths][36004]
5325 * [Cache projections in trans][35761]
5326 * [Optimize the parser's last token handling][36527]
5327 * [Only instantiate #[inline] functions in codegen units referencing
5328 them][36524]. This leads to big improvements in cases where crates export
5329 define many inline functions without using them directly.
5330 * [Lazily allocate TypedArena's first chunk][36592]
5331 * [Don't allocate during default HashSet creation][36734]
5338 * [`overflowing_abs`]
5339 * [`RefCell::try_borrow`]
5340 * [`RefCell::try_borrow_mut`]
5345 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5346 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5348 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5349 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5350 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5351 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5352 * [Use arc4rand on FreeBSD][35884]
5353 * [memrchr: Correct aligned offset computation][35969]
5354 * [Improve Demangling of Rust Symbols][36059]
5355 * [Use monotonic time in condition variables][35048]
5356 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5357 * [Implement conversion traits for `char`][35755]
5358 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5359 * [Zero first byte of CString on drop][36264]
5360 * [Inherit overflow checks for sum and product][36372]
5361 * [Add missing Eq implementations][36423]
5362 * [Implement `Debug` for `DirEntry`][36631]
5363 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5365 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5366 * [Implement more traits for `std::io::ErrorKind`][35911]
5367 * [Optimize BinaryHeap bounds checking][36072]
5368 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5369 `extend_with_element`][36355]
5370 * [Fix overflow checking in unsigned pow()][34942]
5375 * This release includes security fixes to both curl and OpenSSL.
5376 * [Fix transitive doctests when panic=abort][cargo/3021]
5377 * [Add --all-features flag to cargo][cargo/3038]
5378 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5379 * [Don't parse the home directory more than once][cargo/3078]
5380 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5381 * [Update OpenSSL to 1.0.2j][cargo/3121]
5382 * [Add license and license_file to cargo metadata output][cargo/3110]
5383 * [Make crates-io registry URL optional in config; ignore all changes to
5384 source.crates-io][cargo/3089]
5385 * [Don't download dependencies from other platforms][cargo/3123]
5386 * [Build transitive dev-dependencies when needed][cargo/3125]
5387 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5388 * [Avoid updating registry when adding existing deps][cargo/3144]
5389 * [Warn about path overrides that won't work][cargo/3136]
5390 * [Use workspaces during `cargo install`][cargo/3146]
5391 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5392 * [Add --message-format flag][cargo/3000]
5393 * [Pass target environment for rustdoc][cargo/3205]
5394 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5395 * [Update curl and curl-sys][cargo/3241]
5396 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5401 * [rustdoc: Add the `--sysroot` argument][36586]
5402 * [rustdoc: Fix a couple of issues with the search results][35655]
5403 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5404 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5405 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5410 * [Remove unmaintained style guide][35124]
5411 * [Add s390x support][36369]
5412 * [Initial work at Haiku OS support][36727]
5413 * [Add mips-uclibc targets][35734]
5414 * [Crate-ify compiler-rt into compiler-builtins][35021]
5415 * [Add rustc version info (git hash + date) to dist tarball][36213]
5416 * Many documentation improvements
5421 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5422 * [Deny (by default) transmuting from fn item types to pointer-sized
5423 types][34923]. Continuing the long transition to zero-sized fn items,
5425 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5427 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5428 * [Fix lifetime rules for 'if' conditions][36029].
5429 * [Inherit overflow checks for sum and product][36372].
5430 * [Forbid user-defined macros named "macro_rules"][36730].
5432 [33922]: https://github.com/rust-lang/rust/pull/33922
5433 [34623]: https://github.com/rust-lang/rust/pull/34623
5434 [34923]: https://github.com/rust-lang/rust/pull/34923
5435 [34942]: https://github.com/rust-lang/rust/pull/34942
5436 [34982]: https://github.com/rust-lang/rust/pull/34982
5437 [35021]: https://github.com/rust-lang/rust/pull/35021
5438 [35048]: https://github.com/rust-lang/rust/pull/35048
5439 [35074]: https://github.com/rust-lang/rust/pull/35074
5440 [35124]: https://github.com/rust-lang/rust/pull/35124
5441 [35234]: https://github.com/rust-lang/rust/pull/35234
5442 [35238]: https://github.com/rust-lang/rust/pull/35238
5443 [35354]: https://github.com/rust-lang/rust/pull/35354
5444 [35559]: https://github.com/rust-lang/rust/pull/35559
5445 [35585]: https://github.com/rust-lang/rust/pull/35585
5446 [35627]: https://github.com/rust-lang/rust/pull/35627
5447 [35655]: https://github.com/rust-lang/rust/pull/35655
5448 [35702]: https://github.com/rust-lang/rust/pull/35702
5449 [35707]: https://github.com/rust-lang/rust/pull/35707
5450 [35728]: https://github.com/rust-lang/rust/pull/35728
5451 [35734]: https://github.com/rust-lang/rust/pull/35734
5452 [35755]: https://github.com/rust-lang/rust/pull/35755
5453 [35761]: https://github.com/rust-lang/rust/pull/35761
5454 [35764]: https://github.com/rust-lang/rust/pull/35764
5455 [35814]: https://github.com/rust-lang/rust/pull/35814
5456 [35854]: https://github.com/rust-lang/rust/pull/35854
5457 [35871]: https://github.com/rust-lang/rust/pull/35871
5458 [35884]: https://github.com/rust-lang/rust/pull/35884
5459 [35911]: https://github.com/rust-lang/rust/pull/35911
5460 [35969]: https://github.com/rust-lang/rust/pull/35969
5461 [35975]: https://github.com/rust-lang/rust/pull/35975
5462 [36004]: https://github.com/rust-lang/rust/pull/36004
5463 [36008]: https://github.com/rust-lang/rust/pull/36008
5464 [36014]: https://github.com/rust-lang/rust/pull/36014
5465 [36029]: https://github.com/rust-lang/rust/pull/36029
5466 [36059]: https://github.com/rust-lang/rust/pull/36059
5467 [36072]: https://github.com/rust-lang/rust/pull/36072
5468 [36101]: https://github.com/rust-lang/rust/pull/36101
5469 [36104]: https://github.com/rust-lang/rust/pull/36104
5470 [36171]: https://github.com/rust-lang/rust/pull/36171
5471 [36173]: https://github.com/rust-lang/rust/pull/36173
5472 [36178]: https://github.com/rust-lang/rust/pull/36178
5473 [36213]: https://github.com/rust-lang/rust/pull/36213
5474 [36214]: https://github.com/rust-lang/rust/pull/36214
5475 [36264]: https://github.com/rust-lang/rust/pull/36264
5476 [36266]: https://github.com/rust-lang/rust/pull/36266
5477 [36289]: https://github.com/rust-lang/rust/pull/36289
5478 [36338]: https://github.com/rust-lang/rust/pull/36338
5479 [36351]: https://github.com/rust-lang/rust/pull/36351
5480 [36355]: https://github.com/rust-lang/rust/pull/36355
5481 [36369]: https://github.com/rust-lang/rust/pull/36369
5482 [36372]: https://github.com/rust-lang/rust/pull/36372
5483 [36423]: https://github.com/rust-lang/rust/pull/36423
5484 [36482]: https://github.com/rust-lang/rust/pull/36482
5485 [36505]: https://github.com/rust-lang/rust/pull/36505
5486 [36524]: https://github.com/rust-lang/rust/pull/36524
5487 [36527]: https://github.com/rust-lang/rust/pull/36527
5488 [36551]: https://github.com/rust-lang/rust/pull/36551
5489 [36574]: https://github.com/rust-lang/rust/pull/36574
5490 [36586]: https://github.com/rust-lang/rust/pull/36586
5491 [36592]: https://github.com/rust-lang/rust/pull/36592
5492 [36631]: https://github.com/rust-lang/rust/pull/36631
5493 [36639]: https://github.com/rust-lang/rust/pull/36639
5494 [36721]: https://github.com/rust-lang/rust/pull/36721
5495 [36727]: https://github.com/rust-lang/rust/pull/36727
5496 [36730]: https://github.com/rust-lang/rust/pull/36730
5497 [36734]: https://github.com/rust-lang/rust/pull/36734
5498 [36754]: https://github.com/rust-lang/rust/pull/36754
5499 [36995]: https://github.com/rust-lang/rust/pull/36995
5500 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5501 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5502 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5503 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5504 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5505 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5506 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5507 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5508 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5509 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5510 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5511 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5512 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5513 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5514 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5515 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5516 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5517 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5518 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5519 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5520 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5521 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5522 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5523 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5524 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5525 [rustup]: https://www.rustup.rs
5526 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5527 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5528 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5529 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5530 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5531 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5532 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5535 Version 1.12.1 (2016-10-20)
5536 ===========================
5541 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5542 * [Confusion with double negation and booleans][36856]
5543 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5544 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5545 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5546 * [Corrupted memory after updated to 1.12][36936]
5547 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5548 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5549 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5551 [36381]: https://github.com/rust-lang/rust/issues/36381
5552 [36856]: https://github.com/rust-lang/rust/issues/36856
5553 [36875]: https://github.com/rust-lang/rust/issues/36875
5554 [36924]: https://github.com/rust-lang/rust/issues/36924
5555 [36926]: https://github.com/rust-lang/rust/issues/36926
5556 [36936]: https://github.com/rust-lang/rust/issues/36936
5557 [37026]: https://github.com/rust-lang/rust/issues/37026
5558 [37112]: https://github.com/rust-lang/rust/issues/37112
5559 [37153]: https://github.com/rust-lang/rust/issues/37153
5562 Version 1.12.0 (2016-09-29)
5563 ===========================
5568 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5569 This translation pass is far simpler than the previous AST->LLVM pass, and
5570 creates opportunities to perform new optimizations directly on the MIR. It
5571 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5572 * [`rustc` presents a new, more readable error format, along with
5573 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5574 Most common editors supporting Rust have been updated to work with it. It was
5575 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5580 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5581 This translation pass is far simpler than the previous AST->LLVM pass, and
5582 creates opportunities to perform new optimizations directly on the MIR. It
5583 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5584 * [Print the Rust target name, not the LLVM target name, with
5585 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5586 * [The computation of `TypeId` is correct in some cases where it was previously
5587 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5588 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5589 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5590 `--print relocation-models`, and `--print code-models` print the available
5591 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5592 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5593 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5594 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5595 These targets produce statically-linked binaries. There are no binary release
5601 * [`rustc` presents a new, more readable error format, along with
5602 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5603 Most common editors supporting Rust have been updated to work with it. It was
5604 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5605 * [In error descriptions, references are now described in plain English,
5606 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5607 * [In error type descriptions, unknown numeric types are named `{integer}` or
5608 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5609 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5614 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5615 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5616 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5617 useful](https://github.com/rust-lang/rust/pull/34908)
5618 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5619 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5620 * [Semicolons are properly required as statement delimiters inside
5621 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5622 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5627 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5628 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5629 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5630 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5631 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5632 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5633 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5634 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5635 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5636 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5637 Both on Unix and Windows.
5638 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5639 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5640 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5641 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5642 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5643 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5644 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5645 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5650 * [The `format!` macro and friends now allow a single argument to be formatted
5651 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5652 * [The lifetime bounds on `[T]::binary_search_by` and
5653 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5654 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5655 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5656 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5657 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5658 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5659 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5660 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5661 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5662 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5663 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5664 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5665 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5666 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5667 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5668 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5669 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5670 * [`mpsc::sync_channel` `Receiver`s return any available message before
5671 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5672 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5673 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5678 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5679 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5680 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5681 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5682 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5683 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5684 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5685 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5686 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5687 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5688 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5689 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5690 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5691 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5692 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5693 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5698 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5699 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5704 * [Test binaries now support a `--test-threads` argument to specify the number
5705 of threads used to run tests, and which acts the same as the
5706 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5707 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5708 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5709 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5710 * [Rust releases now come with source packages that can be installed by rustup
5711 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5712 The resulting source code can be used by tools and IDES, located in the
5713 sysroot under `lib/rustlib/src`.
5718 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5719 * Many minor improvements to the documentation.
5720 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5725 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5726 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5727 * [When formatting strings, if "precision" is specified, the "fill",
5728 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5729 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5732 Version 1.11.0 (2016-08-18)
5733 ===========================
5738 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5739 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5740 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5741 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5746 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5747 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5748 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5749 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5750 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5751 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5752 (in libcore - previously stabilized in libstd)
5753 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5754 (in libcore - previously stabilized in libstd)
5755 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5756 (in libcore - previously stabilized in libstd)
5757 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5758 (in libcore - previously stabilized in libstd)
5759 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5760 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5761 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5762 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5767 * [The `thread_local!` macro supports multiple definitions in a single
5768 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5769 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5770 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5771 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5772 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5773 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5774 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5775 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5780 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5781 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5782 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5783 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5784 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5785 and `-vv` prints warnings for all crates.
5786 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5787 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5788 This provides room for expansion by arbitrary tools.
5789 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5790 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5791 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5792 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5793 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5794 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5795 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5800 * [Caching projections speeds up type check dramatically for some
5801 workloads](https://github.com/rust-lang/rust/pull/33816)
5802 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5803 This hasher is faster, but is believed to provide sufficient
5804 protection from collision attacks.
5805 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5810 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5811 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5812 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5813 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5814 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5819 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5820 * [When emitting debug info, rustc emits frame pointers for closures,
5821 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5822 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5823 * Many more errors have been given error codes and extended
5825 * API documentation continues to be improved, with many new examples
5830 * [rustc no longer hangs when dependencies recursively re-export
5831 submodules](https://github.com/rust-lang/rust/pull/34542)
5832 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5833 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5834 rewritten](https://github.com/rust-lang/rust/pull/33895)
5835 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5836 No targets use this yet, but it works toward AVR support.
5841 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5842 * [The new follow-set rules that place restrictions on `macro_rules!`
5843 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5844 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5845 and has been a warning since 1.10.
5846 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5847 This causes breakage in some corner cases.
5850 Version 1.10.0 (2016-07-07)
5851 ===========================
5856 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5857 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5858 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5859 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5860 * [`panic!` can be converted to a runtime abort with the
5861 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5862 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5863 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5864 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5865 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5866 Note that Cargo does not yet directly support cdylibs.
5871 * `os::windows::fs::OpenOptionsExt::access_mode`
5872 * `os::windows::fs::OpenOptionsExt::share_mode`
5873 * `os::windows::fs::OpenOptionsExt::custom_flags`
5874 * `os::windows::fs::OpenOptionsExt::attributes`
5875 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5876 * `os::unix::fs::OpenOptionsExt::custom_flags`
5877 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5878 * `Default for sync::Weak`
5879 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5880 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5881 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5882 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5883 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5884 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5885 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5886 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5887 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5888 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5889 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5890 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5891 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5892 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5893 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5894 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5895 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5896 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5897 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5898 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5899 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5900 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5901 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5902 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5903 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5904 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5905 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5906 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5907 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5908 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5909 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5910 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5911 * Read/Write/RawFd impls for `UnixStream`
5912 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5913 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5914 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5915 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5916 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5917 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5918 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5919 * RawFd impls for `UnixListener`
5920 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5921 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5922 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5923 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5924 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5925 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5926 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5927 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5928 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5929 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5930 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5931 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5932 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5933 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5934 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5935 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5936 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5937 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5938 * RawFd impls for `UnixDatagram`
5939 * `{BTree,Hash}Map::values_mut`
5940 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5945 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5946 The semantics of this minor method are subtle and probably not what
5948 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5949 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5950 will fall back to `/dev/urandom` temporarily to avoid blocking
5951 during early boot](https://github.com/rust-lang/rust/pull/33086).
5952 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5953 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5954 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5955 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5956 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5957 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5958 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5962 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5963 This controls the runtime behavior of the `panic!` macro
5964 and can be either "unwind" (the default), or "abort".
5965 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5966 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5967 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5968 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5969 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5970 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5971 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5972 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5973 By default they are retried twice, which can be customized with the
5974 `net.retry` value in `.cargo/config`.
5975 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5976 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5977 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5978 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5979 Makes it possible to install multiple crates in parallel.
5980 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5981 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5982 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5983 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5984 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5985 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5990 * [rustc memory usage was reduced by refactoring the context used for
5991 type checking](https://github.com/rust-lang/rust/pull/33425).
5992 * [Speed up creation of `HashMap`s by caching the random keys used
5993 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5994 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5995 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5996 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5997 10x faster than the previous lookup tables.
5998 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6003 * Many incremental improvements to documentation and rustdoc.
6004 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6005 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6006 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6007 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6008 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6009 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6010 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6015 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6016 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6017 * [`std` no longer prints backtraces on platforms where the running
6018 module must be loaded with `env::current_exe`, which can't be relied
6019 on](https://github.com/rust-lang/rust/pull/33554).
6020 * This release includes std binaries for the i586-unknown-linux-gnu,
6021 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6022 i586 target is for old x86 hardware without SSE2, and the armv7
6023 target is for Android running on modern ARM architectures.
6024 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6025 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6026 * [On Unix the runtime aborts by calling `libc::abort` instead of
6027 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6028 * [Rust is now bootstrapped from the previous release of Rust,
6029 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6034 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6035 * [`target_env` for Linux ARM targets is just `gnu`, not
6036 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6037 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6038 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6039 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6040 Affects how macros are parsed.
6041 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6042 * [Feature-gated attributes on macro-generated macro invocations are
6043 now rejected](https://github.com/rust-lang/rust/pull/32791).
6044 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6045 This caused some minor changes to type inference.
6048 Version 1.9.0 (2016-05-26)
6049 ==========================
6054 * The `#[deprecated]` attribute when applied to an API will generate
6055 warnings when used. The warnings may be suppressed with
6056 `#[allow(deprecated)]`. [RFC 1270].
6057 * [`fn` item types are zero sized, and each `fn` names a unique
6058 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6059 `transmute` on a `fn` type will generate a warning for a few cycles,
6060 then will be converted to an error.
6061 * [Field and method resolution understand visibility, so private
6062 fields and methods cannot prevent the proper use of public fields
6063 and methods][1.9fv].
6064 * [The parser considers unicode codepoints in the
6065 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6071 * [`std::panic::catch_unwind`] (renamed from `recover`)
6072 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6073 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6074 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6075 * [`str::is_char_boundary`]
6076 * [`<*const T>::as_ref`]
6077 * [`<*mut T>::as_ref`]
6078 * [`<*mut T>::as_mut`]
6079 * [`AsciiExt::make_ascii_uppercase`]
6080 * [`AsciiExt::make_ascii_lowercase`]
6081 * [`char::decode_utf16`]
6082 * [`char::DecodeUtf16`]
6083 * [`char::DecodeUtf16Error`]
6084 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6085 * [`BTreeSet::take`]
6086 * [`BTreeSet::replace`]
6089 * [`HashSet::replace`]
6091 * [`OsString::with_capacity`]
6092 * [`OsString::clear`]
6093 * [`OsString::capacity`]
6094 * [`OsString::reserve`]
6095 * [`OsString::reserve_exact`]
6096 * [`OsStr::is_empty`]
6098 * [`std::os::unix::thread`]
6101 * [`JoinHandleExt::as_pthread_t`]
6102 * [`JoinHandleExt::into_pthread_t`]
6103 * [`HashSet::hasher`]
6104 * [`HashMap::hasher`]
6105 * [`CommandExt::exec`]
6106 * [`File::try_clone`]
6107 * [`SocketAddr::set_ip`]
6108 * [`SocketAddr::set_port`]
6109 * [`SocketAddrV4::set_ip`]
6110 * [`SocketAddrV4::set_port`]
6111 * [`SocketAddrV6::set_ip`]
6112 * [`SocketAddrV6::set_port`]
6113 * [`SocketAddrV6::set_flowinfo`]
6114 * [`SocketAddrV6::set_scope_id`]
6115 * [`slice::copy_from_slice`]
6116 * [`ptr::read_volatile`]
6117 * [`ptr::write_volatile`]
6118 * [`OpenOptions::create_new`]
6119 * [`TcpStream::set_nodelay`]
6120 * [`TcpStream::nodelay`]
6121 * [`TcpStream::set_ttl`]
6122 * [`TcpStream::ttl`]
6123 * [`TcpStream::set_only_v6`]
6124 * [`TcpStream::only_v6`]
6125 * [`TcpStream::take_error`]
6126 * [`TcpStream::set_nonblocking`]
6127 * [`TcpListener::set_ttl`]
6128 * [`TcpListener::ttl`]
6129 * [`TcpListener::set_only_v6`]
6130 * [`TcpListener::only_v6`]
6131 * [`TcpListener::take_error`]
6132 * [`TcpListener::set_nonblocking`]
6133 * [`UdpSocket::set_broadcast`]
6134 * [`UdpSocket::broadcast`]
6135 * [`UdpSocket::set_multicast_loop_v4`]
6136 * [`UdpSocket::multicast_loop_v4`]
6137 * [`UdpSocket::set_multicast_ttl_v4`]
6138 * [`UdpSocket::multicast_ttl_v4`]
6139 * [`UdpSocket::set_multicast_loop_v6`]
6140 * [`UdpSocket::multicast_loop_v6`]
6141 * [`UdpSocket::set_multicast_ttl_v6`]
6142 * [`UdpSocket::multicast_ttl_v6`]
6143 * [`UdpSocket::set_ttl`]
6144 * [`UdpSocket::ttl`]
6145 * [`UdpSocket::set_only_v6`]
6146 * [`UdpSocket::only_v6`]
6147 * [`UdpSocket::join_multicast_v4`]
6148 * [`UdpSocket::join_multicast_v6`]
6149 * [`UdpSocket::leave_multicast_v4`]
6150 * [`UdpSocket::leave_multicast_v6`]
6151 * [`UdpSocket::take_error`]
6152 * [`UdpSocket::connect`]
6153 * [`UdpSocket::send`]
6154 * [`UdpSocket::recv`]
6155 * [`UdpSocket::set_nonblocking`]
6160 * [`std::sync::Once` is poisoned if its initialization function
6162 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6163 * [Most types implement `fmt::Debug`][1.9db].
6164 * [The default buffer size used by `BufReader` and `BufWriter` was
6165 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6166 used by other languages.
6167 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6168 `Duration` additionally implements `*=` and `/=`][1.9ta].
6169 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6170 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6171 * [`Chain` implements `BufRead`][1.9ch].
6172 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6177 * [Cargo can now run concurrently][1.9cc].
6178 * [Top-level overrides allow specific revisions of crates to be
6179 overridden through the entire crate graph][1.9ct]. This is intended
6180 to make upgrades easier for large projects, by allowing crates to be
6181 forked temporarily until they've been upgraded and republished.
6182 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6183 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6184 on the commandline][1.9cf]. `rustc` arguments can also be specified
6185 in the `build.rustflags` configuration key.
6190 * [The time complexity of comparing variables for equivalence during type
6191 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6192 to major compilation time improvement in some scenarios.
6193 * [`ToString` is specialized for `str`, giving it the same performance
6194 as `to_owned`][1.9ts].
6195 * [Spawning processes with `Command::output` no longer creates extra
6197 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6198 for C-like enums][1.9cl].
6203 * [Passing the `--quiet` flag to a test runner will produce
6204 much-abbreviated output][1.9q].
6205 * The Rust Project now publishes std binaries for the
6206 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6207 `i586-pc-windows-msvc` targets.
6212 * [`std::sync::Once` is poisoned if its initialization function
6214 * [It is illegal to define methods with the same name in overlapping
6215 inherent `impl` blocks][1.9sn].
6216 * [`fn` item types are zero sized, and each `fn` names a unique
6217 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6218 `transmute` on a `fn` type will generate a warning for a few cycles,
6219 then will be converted to an error.
6220 * [Improvements to const evaluation may trigger new errors when integer
6221 literals are out of range][1.9ce].
6224 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6225 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6226 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6227 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6228 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6229 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6230 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6231 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6232 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6233 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6234 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6235 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6236 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6237 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6238 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6239 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6240 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6241 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6242 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6243 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6244 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6245 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6246 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6247 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6248 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6249 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6250 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6251 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6252 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6253 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6254 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6255 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6256 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6257 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6258 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6259 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6260 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6261 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6262 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6263 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6264 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6265 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6266 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6267 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6268 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6269 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6270 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6271 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6272 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6273 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6274 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6275 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6276 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6277 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6278 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6279 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6280 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6281 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6282 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6283 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6284 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6285 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6286 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6287 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6288 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6289 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6290 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6291 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6292 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6293 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6294 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6295 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6296 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6297 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6298 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6299 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6300 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6301 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6302 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6303 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6304 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6305 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6306 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6307 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6308 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6309 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6310 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6311 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6312 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6313 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6314 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6315 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6316 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6317 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6318 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6319 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6320 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6321 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6322 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6323 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6324 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6325 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6326 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6327 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6328 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6329 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6330 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6331 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6332 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6333 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6336 Version 1.8.0 (2016-04-14)
6337 ==========================
6342 * Rust supports overloading of compound assignment statements like
6343 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6344 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6345 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6347 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6348 addition to the non-braced form, `struct Foo;`. [RFC 218].
6354 * [`str::encode_utf16`] (renamed from `utf16_units`)
6355 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6358 * [`ptr::drop_in_place`]
6360 * [`time::SystemTime`]
6362 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6363 * [`Instant::elapsed`]
6364 * [`SystemTime::now`]
6365 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6366 * [`SystemTime::elapsed`]
6367 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6368 * [`SystemTimeError`]
6369 * [`SystemTimeError::duration`]
6370 * Various impls for `SystemTimeError`
6372 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6373 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6374 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6375 * [The `write!` and `writeln!` macros correctly emit errors if any of
6376 their arguments can't be formatted][1.8w].
6377 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6378 * [The Unix-specific `raw` modules, which contain a number of
6379 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6380 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6381 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6382 across platforms was making it difficult to implement `std`
6383 correctly. Those that need these definitions should use the `libc`
6385 * The Unix-specific `MetadataExt` traits, including
6386 `os::unix::fs::MetadataExt`, which expose values such as inode
6387 numbers [no longer return platform-specific types][1.8r], but
6388 instead return widened integers. [RFC 1415].
6389 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6390 * [Atomic loads and stores are not volatile][1.8a].
6391 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6396 * [Inlining hash functions lead to a 3% compile-time improvement in
6397 some workloads][1.8h].
6398 * When using jemalloc, its symbols are [unprefixed so that it
6399 overrides the libc malloc implementation][1.8h]. This means that for
6400 rustc, LLVM is now using jemalloc, which results in a 6%
6401 compile-time improvement on a specific workload.
6402 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6407 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6408 i686-pc-windows-msvc is now considered a tier-1 platform.
6409 * [The `--print targets` flag prints a list of supported targets][1.8t].
6410 * [The `--print cfg` flag prints the `cfg`s defined for the current
6412 * [`rustc` can be built with an new Cargo-based build system, written
6413 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6414 build system. To enable it configure with `configure --rustbuild`.
6415 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6416 variants while also indicating the total number of missing variants
6417 if more than 3][1.8m].
6418 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6419 * The Rust Project now publishes binary releases of the standard
6420 library for a number of tier-2 targets:
6421 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6422 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6423 `x86_64-rumprun-netbsd`. These can be installed with
6424 tools such as [multirust][1.8mr].
6429 * [`cargo init` creates a new Cargo project in the current
6430 directory][1.8ci]. It is otherwise like `cargo new`.
6431 * [Cargo has configuration keys for `-v` and
6432 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6433 `[term]` section of `.cargo/config`.
6434 * [Configuration keys that evaluate to strings or integers can be set
6435 via environment variables][1.8ce]. For example the `build.jobs` key
6436 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6437 precedence over config files.
6438 * [Target-specific dependencies support Rust `cfg` syntax for
6439 describing targets][1.8cfg] so that dependencies for multiple
6440 targets can be specified together. [RFC 1361].
6441 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6442 `RUSTDOC` take precedence over the `build.target-dir`,
6443 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6444 * [The child process tree is killed on Windows when Cargo is
6446 * [The `build.target` configuration value sets the target platform,
6447 like `--target`][1.8ct].
6452 * [Unstable compiler flags have been further restricted][1.8u]. Since
6453 1.0 `-Z` flags have been considered unstable, and other flags that
6454 were considered unstable additionally required passing `-Z
6455 unstable-options` to access. Unlike unstable language and library
6456 features though, these options have been accessible on the stable
6457 release channel. Going forward, *new unstable flags will not be
6458 available on the stable release channel*, and old unstable flags
6459 will warn about their usage. In the future, all unstable flags will
6460 be unavailable on the stable release channel.
6461 * [It is no longer possible to `match` on empty enum variants using
6462 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6463 * The Unix-specific `MetadataExt` traits, including
6464 `os::unix::fs::MetadataExt`, which expose values such as inode
6465 numbers [no longer return platform-specific types][1.8r], but
6466 instead return widened integers. [RFC 1415].
6467 * [Modules sourced from the filesystem cannot appear within arbitrary
6468 blocks, but only within other modules][1.8mf].
6469 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6470 * On Unix, [stack overflow triggers a runtime abort instead of a
6472 * [`Command::spawn` and its equivalents return an error if any of
6473 its command-line arguments contain interior `NUL`s][1.8n].
6474 * [Tuple and unit enum variants from other crates are in the type
6476 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6477 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6478 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6479 instead of `foo.lib`.
6482 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6483 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6484 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6485 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6486 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6487 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6488 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6489 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6490 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6491 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6492 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6493 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6494 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6495 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6496 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6497 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6498 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6499 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6500 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6501 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6502 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6503 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6504 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6505 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6506 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6507 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6508 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6509 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6510 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6511 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6512 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6513 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6514 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6515 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6516 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6517 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6518 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6519 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6520 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6521 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6522 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6523 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6524 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6525 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6526 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6527 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6528 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6529 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6530 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6531 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6532 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6533 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6534 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6535 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6536 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6537 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6538 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6539 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6540 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6541 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6544 Version 1.7.0 (2016-03-03)
6545 ==========================
6552 * [`Path::strip_prefix`] (renamed from relative_from)
6553 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6555 * [`Ipv4Addr::is_loopback`]
6556 * [`Ipv4Addr::is_private`]
6557 * [`Ipv4Addr::is_link_local`]
6558 * [`Ipv4Addr::is_multicast`]
6559 * [`Ipv4Addr::is_broadcast`]
6560 * [`Ipv4Addr::is_documentation`]
6562 * [`Ipv6Addr::is_unspecified`]
6563 * [`Ipv6Addr::is_loopback`]
6564 * [`Ipv6Addr::is_multicast`]
6567 * [`Vec::as_mut_slice`]
6569 * [`String::as_str`]
6570 * [`String::as_mut_str`]
6572 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6574 * `<[T]>::`[`sort_by_key`]
6575 * checked, saturated, and overflowing operations
6576 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6577 * [`i32::saturating_mul`]
6578 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6579 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6580 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6581 * [`u32::saturating_mul`]
6582 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6583 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6584 * and checked, saturated, and overflowing operations for other primitive types
6586 * [`ffi::IntoStringError`]
6587 * [`CString::into_string`]
6588 * [`CString::into_bytes`]
6589 * [`CString::into_bytes_with_nul`]
6590 * `From<CString> for Vec<u8>`
6592 * [`IntoStringError::into_cstring`]
6593 * [`IntoStringError::utf8_error`]
6594 * `Error for IntoStringError`
6596 * [`std::hash::BuildHasher`]
6597 * [`BuildHasher::Hasher`]
6598 * [`BuildHasher::build_hasher`]
6599 * [`std::hash::BuildHasherDefault`]
6600 * [`HashMap::with_hasher`]
6601 * [`HashMap::with_capacity_and_hasher`]
6602 * [`HashSet::with_hasher`]
6603 * [`HashSet::with_capacity_and_hasher`]
6604 * [`std::collections::hash_map::RandomState`]
6605 * [`RandomState::new`]
6606 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6607 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6608 from bytes is faster.
6609 * [The performance of `LineWriter` (and thus `io::stdout`) was
6610 improved by using `memchr` to search for newlines][1.7m].
6611 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6612 `f64` variants were stabilized previously.
6613 * [`BTreeMap` was rewritten to use less memory and improve the performance
6614 of insertion and iteration, the latter by as much as 5x][1.7bm].
6615 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6616 covariant over their contained type][1.7bt].
6617 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6618 over their contained type][1.7ll].
6619 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6621 * [`Any` is implemented for unsized types][1.7a].
6622 * [`Hash` is implemented for `Duration`][1.7h].
6627 * [When running tests with `--test`, rustdoc will pass `--cfg`
6628 arguments to the compiler][1.7dt].
6629 * [The compiler is built with RPATH information by default][1.7rpa].
6630 This means that it will be possible to run `rustc` when installed in
6631 unusual configurations without configuring the dynamic linker search
6633 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6634 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6635 over `LD_LIBRARY_PATH`.
6640 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6641 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6642 * [The `rerun-if-changed` build script directive no longer causes the
6643 build script to incorrectly run twice in certain scenarios][1.7rr].
6648 * Soundness fixes to the interactions between associated types and
6649 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6650 code that violates the new rules. This is a significant change that
6651 is known to break existing code, so it has emitted warnings for the
6652 new error cases since 1.4 to give crate authors time to adapt. The
6653 details of what is changing are subtle; read the RFC for more.
6654 * [Several bugs in the compiler's visibility calculations were
6655 fixed][1.7v]. Since this was found to break significant amounts of
6656 code, the new errors will be emitted as warnings for several release
6657 cycles, under the `private_in_public` lint.
6658 * Defaulted type parameters were accidentally accepted in positions
6659 that were not intended. In this release, [defaulted type parameters
6660 appearing outside of type definitions will generate a
6661 warning][1.7d], which will become an error in future releases.
6662 * [Parsing "." as a float results in an error instead of 0][1.7p].
6663 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6664 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6666 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6667 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6668 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6669 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6670 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6671 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6672 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6673 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6674 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6675 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6676 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6677 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6678 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6679 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6680 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6681 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6682 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6683 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6684 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6685 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6686 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6687 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6688 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6689 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6690 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6691 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6692 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6693 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6694 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6695 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6696 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6697 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6698 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6699 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6700 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6701 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6702 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6703 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6704 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6705 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6706 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6707 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6708 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6709 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6710 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6711 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6712 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6713 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6714 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6715 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6716 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6717 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6718 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6719 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6720 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6721 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6722 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6723 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6724 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6725 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6726 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6727 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6728 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6729 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6730 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6731 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6732 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6733 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6734 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6735 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6736 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6737 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6738 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6739 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6740 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6741 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6742 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6743 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6744 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6747 Version 1.6.0 (2016-01-21)
6748 ==========================
6753 * The `#![no_std]` attribute causes a crate to not be linked to the
6754 standard library, but only the [core library][1.6co], as described
6755 in [RFC 1184]. The core library defines common types and traits but
6756 has no platform dependencies whatsoever, and is the basis for Rust
6757 software in environments that cannot support a full port of the
6758 standard library, such as operating systems. Most of the core
6759 library is now stable.
6765 [`Read::read_exact`],
6766 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6767 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6768 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6769 [`os::unix::fs::DirBuilderExt`],
6770 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6771 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6772 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6773 [`collections::hash_map::Drain`],
6774 [`collections::hash_map::HashMap::drain`],
6775 [`collections::hash_set::Drain`],
6776 [`collections::hash_set::HashSet::drain`],
6777 [`collections::binary_heap::Drain`],
6778 [`collections::binary_heap::BinaryHeap::drain`],
6779 [`Vec::extend_from_slice`] (renamed from `push_all`),
6780 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6781 [`RwLock::into_inner`],
6782 [`Iterator::min_by_key`] (renamed from `min_by`),
6783 [`Iterator::max_by_key`] (renamed from `max_by`).
6784 * The [core library][1.6co] is stable, as are most of its APIs.
6785 * [The `assert_eq!` macro supports arguments that don't implement
6786 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6788 * Several timer functions that take duration in milliseconds [are
6789 deprecated in favor of those that take `Duration`][1.6ms]. These
6790 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6791 `thread::park_timeout_ms`.
6792 * The algorithm by which `Vec` reserves additional elements was
6793 [tweaked to not allocate excessive space][1.6a] while still growing
6795 * `From` conversions are [implemented from integers to floats][1.6f]
6796 in cases where the conversion is lossless. Thus they are not
6797 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6798 or `f64`. They are also not implemented for `isize` and `usize`
6799 because the implementations would be platform-specific. `From` is
6800 also implemented from `f32` to `f64`.
6801 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6802 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6803 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6804 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6806 * Sorting slices that are already sorted [is 50% faster in some
6812 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6813 * Cargo build scripts can specify their dependencies by emitting the
6814 [`rerun-if-changed`][1.6rr] key.
6815 * crates.io will reject publication of crates with dependencies that
6816 have a wildcard version constraint. Crates with wildcard
6817 dependencies were seen to cause a variety of problems, as described
6818 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6820 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6821 release folder. A variety of artifacts that Cargo failed to clean
6822 are now correctly deleted.
6827 * The `unreachable_code` lint [warns when a function call's argument
6829 * The parser indicates [failures that may be caused by
6830 confusingly-similar Unicode characters][1.6uc]
6831 * Certain macro errors [are reported at definition time][1.6m], not
6837 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6838 environment variable when locating crates. This was a pre-cargo
6839 feature for integrating with the package manager that was
6840 accidentally never removed.
6841 * [A number of bugs were fixed in the privacy checker][1.6p] that
6842 could cause previously-accepted code to break.
6843 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6844 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6845 struct pattern syntax (`Foo(..)`) can no longer be used to match
6846 unit structs. This is a warning now, but will become an error in
6847 future releases. Patterns that share the same name as a const are
6849 * A bug was fixed that causes [rustc not to apply default type
6850 parameters][1.6xc] when resolving certain method implementations of
6851 traits defined in other crates.
6853 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6854 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6855 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6856 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6857 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6858 [1.6co]: http://doc.rust-lang.org/core/index.html
6859 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6860 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6861 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6862 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6863 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6864 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6865 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6866 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6867 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6868 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6869 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6870 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6871 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6872 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6873 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6874 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6875 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6876 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6877 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6878 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6879 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6880 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6881 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6882 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6883 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6884 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6885 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6886 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6887 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6888 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6889 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6890 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6891 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6892 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6893 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6894 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6895 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6896 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6897 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6898 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6899 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6902 Version 1.5.0 (2015-12-10)
6903 ==========================
6905 * ~700 changes, numerous bugfixes
6911 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6912 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6913 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6914 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6915 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6916 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6917 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6918 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6919 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6920 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6921 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6922 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6923 [`Path::read_link`], [`Path::symlink_metadata`],
6924 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6925 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6926 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6927 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6928 [`slice::split_first_mut`], [`slice::split_first`],
6929 [`slice::split_last_mut`], [`slice::split_last`],
6930 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6931 [`str::MatchIndices`], [`str::RMatchIndices`],
6932 [`str::match_indices`], [`str::rmatch_indices`],
6933 [`str::slice_mut_unchecked`], [`string::ParseError`].
6934 * Rust applications hosted on crates.io can be installed locally to
6935 `~/.cargo/bin` with the [`cargo install`] command. Among other
6936 things this makes it easier to augment Cargo with new subcommands:
6937 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6938 invoked as `cargo foo`.
6939 * Crates with wildcard (`*`) dependencies will [emit warnings when
6940 published][1.5w]. In 1.6 it will no longer be possible to publish
6941 crates with wildcard dependencies.
6946 * The rules determining when a particular lifetime must outlive
6947 a particular value (known as '[dropck]') have been [modified
6948 to not rely on parametricity][1.5p].
6949 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6950 and `Arc`][1.5a]. Because these smart pointer types implement
6951 `Deref`, this causes breakage in cases where the interior type
6952 contains methods of the same name.
6953 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6954 that they could drop their content. Soundness fix.
6955 * All method invocations are [properly checked][1.5wf1] for
6956 [well-formedness][1.5wf2]. Soundness fix.
6957 * Traits whose supertraits contain `Self` are [not object
6958 safe][1.5o]. Soundness fix.
6959 * Target specifications support a [`no_default_libraries`][1.5nd]
6960 setting that controls whether `-nodefaultlibs` is passed to the
6961 linker, and in turn the `is_like_windows` setting no longer affects
6962 the `-nodefaultlibs` flag.
6963 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6964 * The `#[inline]` and `#[repr]` attributes [can only appear
6965 in valid locations][1.5at].
6966 * Native libraries linked from the local crate are [passed to
6967 the linker before native libraries from upstream crates][1.5nl].
6968 * Two rarely-used attributes, `#[no_debug]` and
6969 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6970 * Negation of unsigned integers, which has been a warning for
6971 several releases, [is now behind a feature gate and will
6972 generate errors][1.5nu].
6973 * The parser accidentally accepted visibility modifiers on
6974 enum variants, a bug [which has been fixed][1.5ev].
6975 * [A bug was fixed that allowed `use` statements to import unstable
6981 * When evaluating expressions at compile-time that are not
6982 compile-time constants (const-evaluating expressions in non-const
6983 contexts), incorrect code such as overlong bitshifts and arithmetic
6984 overflow will [generate a warning instead of an error][1.5ce],
6985 delaying the error until runtime. This will allow the
6986 const-evaluator to be expanded in the future backwards-compatibly.
6987 * The `improper_ctypes` lint [no longer warns about using `isize` and
6988 `usize` in FFI][1.5ict].
6993 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6995 * `Default` is [implemented for mutable slices][1.5d].
6996 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6997 * There are now `From` conversions [between floating point
6998 types][1.5f] where the conversions are lossless.
6999 * There are now `From` conversions [between integer types][1.5i] where
7000 the conversions are lossless.
7001 * [`fs::Metadata` implements `Clone`][1.5fs].
7002 * The `parse` method [accepts a leading "+" when parsing
7004 * [`AsMut` is implemented for `Vec`][1.5am].
7005 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7006 been optimized][1.5cf] and no longer rely on the default impl.
7007 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7008 `unsafe extern "C"` function types now [implement `Clone`,
7009 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7010 `fmt::Debug` for up to 12 arguments][1.5fp].
7011 * [Dropping `Vec`s is much faster in unoptimized builds when the
7012 element types don't implement `Drop`][1.5dv].
7013 * A bug that caused in incorrect behavior when [combining `VecDeque`
7014 with zero-sized types][1.5vdz] was resolved.
7015 * [`PartialOrd` for slices is faster][1.5po].
7020 * [Crate metadata size was reduced by 20%][1.5md].
7021 * [Improvements to code generation reduced the size of libcore by 3.3
7022 MB and rustc's memory usage by 18MB][1.5m].
7023 * [Improvements to deref translation increased performance in
7024 unoptimized builds][1.5dr].
7025 * Various errors in trait resolution [are deduplicated to only be
7026 reported once][1.5te].
7027 * Rust has preliminary [support for rumprun kernels][1.5rr].
7028 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7030 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7031 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7032 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7033 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7034 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7035 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7036 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7037 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7038 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7039 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7040 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7041 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7042 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7043 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7044 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7045 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7046 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7047 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7048 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7049 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7050 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7051 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7052 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7053 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7054 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7055 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7056 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7057 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7058 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7059 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7060 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7061 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7062 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7063 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7064 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7065 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7066 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7067 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7068 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7069 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7070 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7071 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7072 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7073 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7074 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7075 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7076 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7077 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7078 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7079 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7080 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7081 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7082 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7083 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7084 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7085 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7086 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7087 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7088 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7089 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7090 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7091 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7092 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7093 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7094 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7095 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7096 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7097 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7098 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7099 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7100 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7101 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7102 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7103 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7104 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7105 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7106 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7107 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7108 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7109 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7110 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7111 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7112 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7113 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7114 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7115 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7116 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7117 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7118 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7120 Version 1.4.0 (2015-10-29)
7121 ==========================
7123 * ~1200 changes, numerous bugfixes
7128 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7129 GNU) are now supported and recommended for use.
7134 * [Several changes have been made to fix type soundness and improve
7135 the behavior of associated types][sound]. See [RFC 1214]. Although
7136 we have mostly introduced these changes as warnings this release, to
7137 become errors next release, there are still some scenarios that will
7138 see immediate breakage.
7139 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7140 line breaks in addition to `\n`][crlf].
7141 * [Loans of `'static` lifetime extend to the end of a function][stat].
7142 * [`str::parse` no longer introduces avoidable rounding error when
7143 parsing floating point numbers. Together with earlier changes to
7144 float formatting/output, "round trips" like f.to_string().parse()
7145 now preserve the value of f exactly. Additionally, leading plus
7146 signs are now accepted][fp3].
7152 * `use` statements that import multiple items [can now rename
7153 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7154 * [Binops work correctly on fat pointers][binfat].
7155 * `pub extern crate`, which does not behave as expected, [issues a
7156 warning][pec] until a better solution is found.
7161 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7162 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7163 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7164 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7165 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7166 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7167 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7168 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7169 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7170 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7171 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7172 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7173 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7174 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7175 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7176 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7177 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7178 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7180 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7181 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7182 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7183 `f64::from_str_radix`.
7184 * [Reverse-searching strings is faster with the 'two-way'
7186 * [`std::io::copy` allows `?Sized` arguments][cc].
7187 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7188 [override `count`, `nth` and `last` with an O(1)
7189 implementation][it].
7190 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7191 * [`IntoRawFd` has been added to the Unix-specific prelude,
7192 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7194 * [`Extend<String>` and `FromIterator<String` are both implemented for
7196 * [`IntoIterator` is implemented for references to `Option` and
7198 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7199 Copy`][ext] as part of [RFC 839]. This will cause type inference
7200 breakage in rare situations.
7201 * [`BinaryHeap` implements `Debug`][bh2].
7202 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7204 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7205 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7206 * [String comparison is faster][faststr].
7207 * `&mut T` where `T: std::fmt::Write` [also implements
7208 `std::fmt::Write`][mutw].
7209 * [A stable regression in `VecDeque::push_back` and other
7210 capacity-altering methods that caused panics for zero-sized types
7212 * [Function pointers implement traits for up to 12 parameters][fp2].
7217 * The compiler [no longer uses the 'morestack' feature to prevent
7218 stack overflow][mm]. Instead it uses guard pages and stack
7219 probes (though stack probes are not yet implemented on any platform
7221 * [The compiler matches traits faster when projections are involved][p].
7222 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7224 * [Cargo now displays useful information about what its doing during
7225 `cargo update`][cu].
7227 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7228 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7229 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7230 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7231 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7232 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7233 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7234 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7235 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7236 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7237 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7238 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7239 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7240 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7241 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7242 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7243 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7244 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7245 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7246 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7247 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7248 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7249 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7250 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7251 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7252 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7253 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7254 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7255 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7256 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7257 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7258 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7259 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7260 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7261 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7262 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7263 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7264 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7265 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7266 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7267 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7268 [bh2]: https://github.com/rust-lang/rust/pull/28156
7269 [binfat]: https://github.com/rust-lang/rust/pull/28270
7270 [bm]: https://github.com/rust-lang/rust/pull/28197
7271 [cc]: https://github.com/rust-lang/rust/pull/27531
7272 [crlf]: https://github.com/rust-lang/rust/pull/28034
7273 [cu]: https://github.com/rust-lang/cargo/pull/1931
7274 [d]: https://github.com/rust-lang/rust/pull/27825
7275 [dep]: https://github.com/rust-lang/rust/pull/28339
7276 [es]: https://github.com/rust-lang/rust/pull/27956
7277 [ext]: https://github.com/rust-lang/rust/pull/28094
7278 [faststr]: https://github.com/rust-lang/rust/pull/28338
7279 [ffi]: https://github.com/rust-lang/rust/pull/28779
7280 [fp]: https://github.com/rust-lang/rust/pull/28268
7281 [fp2]: https://github.com/rust-lang/rust/pull/28560
7282 [fp3]: https://github.com/rust-lang/rust/pull/27307
7283 [i]: https://github.com/rust-lang/rust/pull/27451
7284 [into2]: https://github.com/rust-lang/rust/pull/28039
7285 [it]: https://github.com/rust-lang/rust/pull/27652
7286 [mm]: https://github.com/rust-lang/rust/pull/27338
7287 [mutw]: https://github.com/rust-lang/rust/pull/28368
7288 [sound]: https://github.com/rust-lang/rust/pull/27641
7289 [p]: https://github.com/rust-lang/rust/pull/27866
7290 [pec]: https://github.com/rust-lang/rust/pull/28486
7291 [pr]: https://github.com/rust-lang/rust/pull/27896
7292 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7293 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7294 [s]: https://github.com/rust-lang/rust/pull/27474
7295 [stab]: https://github.com/rust-lang/rust/pull/28339
7296 [stat]: https://github.com/rust-lang/rust/pull/28321
7297 [vd]: https://github.com/rust-lang/rust/pull/28494
7299 Version 1.3.0 (2015-09-17)
7300 ==============================
7302 * ~900 changes, numerous bugfixes
7307 * The [new object lifetime defaults][nold] have been [turned
7308 on][nold2] after a cycle of warnings about the change. Now types
7309 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7310 being interpreted as `&'a Box<Trait+'a>` to `&'a
7311 Box<Trait+'static>`.
7312 * [The Rustonomicon][nom] is a new book in the official documentation
7313 that dives into writing unsafe Rust.
7314 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7315 timekeeping is employed by other std APIs, as well as out-of-tree
7321 * The [new object lifetime defaults][nold] have been [turned
7322 on][nold2] after a cycle of warnings about the change.
7323 * There is a known [regression][lr] in how object lifetime elision is
7324 interpreted, the proper solution for which is undetermined.
7325 * The `#[prelude_import]` attribute, an internal implementation
7326 detail, was accidentally stabilized previously. [It has been put
7327 behind the `prelude_import` feature gate][pi]. This change is
7328 believed to break no existing code.
7329 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7330 [more sane for dynamically sized types][dst3]. Code that relied on
7331 the previous behavior is thought to be broken.
7332 * The `dropck` rules, which checks that destructors can't access
7333 destroyed values, [have been updated][dropck] to match the
7334 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7335 cause some previously-compiling code to no longer build.
7340 * The [new object lifetime defaults][nold] have been [turned
7341 on][nold2] after a cycle of warnings about the change.
7342 * Semicolons may [now follow types and paths in
7343 macros](https://github.com/rust-lang/rust/pull/27000).
7344 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7345 [more sane for dynamically sized types][dst3]. Code that relied on
7346 the previous behavior is not known to exist, and suspected to be
7348 * `'static` variables [may now be recursive][st].
7349 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7350 implementations correctly.
7351 * The `dropck` rules, which checks that destructors can't access
7352 destroyed values, [have been updated][dropck] to match the
7358 * The [`Duration`] API, [has been stabilized][ds], as well as the
7359 `std::time` module, which presently contains only `Duration`.
7360 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7361 * The owned C string, [`CString`], implements [`Borrow`] and the
7362 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7363 these allow C strings to be borrowed and cloned in generic code.
7364 * [`CStr`] implements [`Debug`].
7365 * [`AtomicPtr`] implements [`Debug`].
7366 * [`Error`] trait objects [can be downcast to their concrete types][e]
7367 in many common configurations, using the [`is`], [`downcast`],
7368 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7370 * Searching for substrings now [employs the two-way algorithm][search]
7371 instead of doing a naive search. This gives major speedups to a
7372 number of methods, including [`contains`][sc], [`find`][sf],
7373 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7374 [`ends_with`][sew] are also faster.
7375 * The performance of `PartialEq` for slices is [much faster][ps].
7376 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7377 is overridden and optimized by the implementations for scalars.
7378 * The [`Hasher`] trait now has a number of specialized `write_*`
7379 methods for primitive types, for efficiency.
7380 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7381 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7382 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7383 of [`std::error::Error::cause`][iec] also delegates to the inner
7385 * [`process::Child`][pc] gained the [`id`] method, which returns a
7386 `u32` representing the platform-specific process identifier.
7387 * The [`connect`] method on slices is deprecated, replaced by the new
7388 [`join`] method (note that both of these are on the *unstable*
7389 [`SliceConcatExt`] trait, but through the magic of the prelude are
7390 available to stable code anyway).
7391 * The [`Div`] operator is implemented for [`Wrapping`] types.
7392 * [`DerefMut` is implemented for `String`][dms].
7393 * Performance of SipHash (the default hasher for `HashMap`) is
7394 [better for long data][sh].
7395 * [`AtomicPtr`] implements [`Send`].
7396 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7397 are now [specialized to use uninitialized buffers for increased
7399 * Lifetime parameters of foreign functions [are now resolved
7405 * Rust can now, with some coercion, [produce programs that run on
7406 Windows XP][xp], though XP is not considered a supported platform.
7407 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7408 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7409 recommended for use in 1.3, though should be fully-functional
7410 in the [64-bit 1.4 beta][b14].
7411 * On Fedora-based systems installation will [properly configure the
7412 dynamic linker][fl].
7413 * The compiler gained many new extended error descriptions, which can
7414 be accessed with the `--explain` flag.
7415 * The `dropck` pass, which checks that destructors can't access
7416 destroyed values, [has been rewritten][dropck]. This fixes some
7417 soundness holes, and as such will cause some previously-compiling
7418 code to no longer build.
7419 * `rustc` now uses [LLVM to write archive files where possible][ar].
7420 Eventually this will eliminate the compiler's dependency on the ar
7422 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7423 supported FreeBSD on x86_64).
7424 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7425 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7427 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7428 will kill the process instead of leaking][nlp].
7430 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7431 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7432 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7433 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7434 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7435 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7436 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7437 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7438 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7439 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7440 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7441 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7442 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7443 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7444 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7445 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7446 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7447 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7448 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7449 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7450 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7451 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7452 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7453 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7454 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7455 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7456 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7457 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7458 [ar]: https://github.com/rust-lang/rust/pull/26926
7459 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7460 [dms]: https://github.com/rust-lang/rust/pull/26241
7461 [dropck]: https://github.com/rust-lang/rust/pull/27261
7462 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7463 [ds]: https://github.com/rust-lang/rust/pull/26818
7464 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7465 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7466 [dst3]: https://github.com/rust-lang/rust/pull/27351
7467 [e]: https://github.com/rust-lang/rust/pull/24793
7468 [f]: https://github.com/rust-lang/rust/pull/26588
7469 [fb]: https://github.com/rust-lang/rust/pull/26959
7470 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7471 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7472 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7473 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7474 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7475 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7476 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7477 [lic]: https://github.com/rust-lang/rust/pull/26583
7478 [lnu]: https://github.com/rust-lang/rust/pull/27026
7479 [lr]: https://github.com/rust-lang/rust/issues/27248
7480 [lum]: https://github.com/rust-lang/rust/pull/26378
7481 [lur]: https://github.com/rust-lang/rust/pull/26783
7482 [nlp]: https://github.com/rust-lang/rust/pull/27176
7483 [nold2]: https://github.com/rust-lang/rust/pull/27045
7484 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7485 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7486 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7487 [pi]: https://github.com/rust-lang/rust/pull/26699
7488 [ps]: https://github.com/rust-lang/rust/pull/26884
7489 [rte]: https://github.com/rust-lang/rust/pull/26950
7490 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7491 [search]: https://github.com/rust-lang/rust/pull/26327
7492 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7493 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7494 [sh]: https://github.com/rust-lang/rust/pull/27280
7495 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7496 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7497 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7498 [st]: https://github.com/rust-lang/rust/pull/26630
7499 [win1]: https://github.com/rust-lang/rust/pull/26569
7500 [win2]: https://github.com/rust-lang/rust/pull/26741
7501 [win3]: https://github.com/rust-lang/rust/pull/26741
7502 [win4]: https://github.com/rust-lang/rust/pull/27210
7503 [xp]: https://github.com/rust-lang/rust/pull/26569
7505 Version 1.2.0 (2015-08-07)
7506 ==========================
7508 * ~1200 changes, numerous bugfixes
7513 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7514 like `Rc` to contain types without a fixed size, arrays and trait
7515 objects, finally enabling use of `Rc<[T]>` and completing the
7516 implementation of DST.
7517 * [Parallel codegen][parcodegen] is now working again, which can
7518 substantially speed up large builds in debug mode; It also gets
7519 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7520 jobs). It's not enabled by default, but will be "in the near
7521 future". It can be activated with the `-C codegen-units=N` flag to
7523 * This is the first release with [experimental support for linking
7524 with the MSVC linker and lib C on Windows (instead of using the GNU
7525 variants via MinGW)][win]. It is yet recommended only for the most
7526 intrepid Rustaceans.
7527 * Benchmark compilations are showing a 30% improvement in
7528 bootstrapping over 1.1.
7533 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7534 unicode case mapping, which is a previously-planned change in
7535 behavior and considered a bugfix.
7536 * [`mem::align_of`] now specifies [the *minimum alignment* for
7537 T][align], which is usually the alignment programs are interested
7538 in, and the same value reported by clang's
7539 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7541 * [The `#[packed]` attribute is no longer silently accepted by the
7542 compiler][packed]. This attribute did nothing and code that
7543 mentioned it likely did not work as intended.
7544 * Associated type defaults are [now behind the
7545 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7546 defaults *did not work*, but could be mentioned syntactically. As
7547 such this breakage has minimal impact.
7552 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7553 matching against dereferenceable values.
7558 * The [`Extend`] trait, which grows a collection from an iterator, is
7559 implemented over iterators of references, for `String`, `Vec`,
7560 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7561 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7562 * The [`iter::once`] function returns an iterator that yields a single
7563 element, and [`iter::empty`] returns an iterator that yields no
7565 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7566 over substring matches.
7567 * [`Cell`] and [`RefCell`] both implement `Eq`.
7568 * A number of methods for wrapping arithmetic are added to the
7569 integral types, [`wrapping_div`], [`wrapping_rem`],
7570 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7571 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7572 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7573 type.. It is illegal for the default arithmetic operations in Rust
7574 to overflow; the desire to wrap must be explicit.
7575 * The `{:#?}` formatting specifier [displays the alternate,
7576 pretty-printed][debugfmt] form of the `Debug` formatter. This
7577 feature was actually introduced prior to 1.0 with little
7579 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7580 for writing data to formatted strings, similar to [`io::Write`].
7581 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7582 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7583 are used by code generators to emit implementations of [`Debug`].
7584 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7585 methods that convert case, following Unicode case mapping.
7586 * It is now easier to handle poisoned locks. The [`PoisonError`]
7587 type, returned by failing lock operations, exposes `into_inner`,
7588 `get_ref`, and `get_mut`, which all give access to the inner lock
7589 guard, and allow the poisoned lock to continue to operate. The
7590 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7591 poisoned lock without attempting to take the lock.
7592 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7593 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7594 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7595 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7597 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7603 * `rustc` employs smarter heuristics for guessing at [typos].
7604 * `rustc` emits more efficient code for [no-op conversions between
7605 unsafe pointers][nop].
7606 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7607 resulting in faster compile times and smaller code.
7609 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7610 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7611 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7612 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7613 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7614 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7615 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7616 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7617 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7618 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7619 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7620 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7621 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7622 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7623 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7624 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7625 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7626 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7627 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7628 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7629 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7630 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7631 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7632 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7633 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7634 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7635 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7636 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7637 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7638 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7639 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7640 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7641 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7642 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7643 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7644 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7645 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7646 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7647 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7648 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7649 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7650 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7651 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7652 [align]: https://github.com/rust-lang/rust/pull/25646
7653 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7654 [typos]: https://github.com/rust-lang/rust/pull/26087
7655 [nop]: https://github.com/rust-lang/rust/pull/26336
7656 [fat]: https://github.com/rust-lang/rust/pull/26411
7657 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7658 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7659 [packed]: https://github.com/rust-lang/rust/pull/25541
7660 [ad]: https://github.com/rust-lang/rust/pull/27382
7661 [win]: https://github.com/rust-lang/rust/pull/25350
7663 Version 1.1.0 (2015-06-25)
7664 =========================
7666 * ~850 changes, numerous bugfixes
7671 * The [`std::fs` module has been expanded][fs] to expand the set of
7672 functionality exposed:
7673 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7674 don't incur a syscall on some platforms.
7675 * A `symlink_metadata` function has been added.
7676 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7677 access to all underlying information.
7678 * The compiler now contains extended explanations of many errors. When an error
7679 with an explanation occurs the compiler suggests using the `--explain` flag
7680 to read the explanation. Error explanations are also [available online][err-index].
7681 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7682 well as other work, the time to bootstrap the compiler decreased by
7688 * The [`str::split_whitespace`] method splits a string on unicode
7689 whitespace boundaries.
7690 * On both Windows and Unix, new extension traits provide conversion of
7691 I/O types to and from the underlying system handles. On Unix, these
7692 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7693 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7694 `TcpListener`, and `UpdSocket`. Further implementations for
7695 `std::process` will be stabilized later.
7696 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7697 Windows, symlinks can be created with
7698 `std::os::windows::symlink_dir` and
7699 `std::os::windows::symlink_file`.
7700 * The `mpsc::Receiver` type can now be converted into an iterator with
7701 `into_iter` on the [`IntoIterator`] trait.
7702 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7703 implementation of the [`From`] trait.
7704 * The `Debug` implementation for `RangeFull` [creates output that is
7705 more consistent with other implementations][rf].
7706 * [`Debug` is implemented for `File`][file].
7707 * The `Default` implementation for `Arc` [no longer requires `Sync +
7709 * [The `Iterator` methods `count`, `nth`, and `last` have been
7710 overridden for slices to have O(1) performance instead of O(n)][si].
7711 * Incorrect handling of paths on Windows has been improved in both the
7712 compiler and the standard library.
7713 * [`AtomicPtr` gained a `Default` implementation][ap].
7714 * In accordance with Rust's policy on arithmetic overflow `abs` now
7715 [panics on overflow when debug assertions are enabled][abs].
7716 * The [`Cloned`] iterator, which was accidentally left unstable for
7717 1.0 [has been stabilized][c].
7718 * The [`Incoming`] iterator, which iterates over incoming TCP
7719 connections, and which was accidentally unnamable in 1.0, [is now
7720 properly exported][inc].
7721 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7722 `sift_up` or `sift_down` panic][bh].
7723 * The [`split_off`] method of `LinkedList` [no longer corrupts
7724 the list in certain scenarios][ll].
7729 * Type checking performance [has improved notably][sk] with
7730 [multiple improvements][pre].
7731 * The compiler [suggests code changes][ch] for more errors.
7732 * rustc and it's build system have experimental support for [building
7733 toolchains against MUSL][m] instead of glibc on Linux.
7734 * The compiler defines the `target_env` cfg value, which is used for
7735 distinguishing toolchains that are otherwise for the same
7736 platform. Presently this is set to `gnu` for common GNU Linux
7737 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7738 * The [`cargo rustc`][crc] command invokes a build with custom flags
7740 * [Android executables are always position independent][pie].
7741 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7744 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7745 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7746 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7747 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7748 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7749 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7750 [rf]: https://github.com/rust-lang/rust/pull/24491
7751 [err-index]: https://doc.rust-lang.org/error-index.html
7752 [sk]: https://github.com/rust-lang/rust/pull/24615
7753 [pre]: https://github.com/rust-lang/rust/pull/25323
7754 [file]: https://github.com/rust-lang/rust/pull/24598
7755 [ch]: https://github.com/rust-lang/rust/pull/24683
7756 [arc]: https://github.com/rust-lang/rust/pull/24695
7757 [si]: https://github.com/rust-lang/rust/pull/24701
7758 [ap]: https://github.com/rust-lang/rust/pull/24834
7759 [m]: https://github.com/rust-lang/rust/pull/24777
7760 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7761 [crc]: https://github.com/rust-lang/cargo/pull/1568
7762 [pie]: https://github.com/rust-lang/rust/pull/24953
7763 [abs]: https://github.com/rust-lang/rust/pull/25441
7764 [c]: https://github.com/rust-lang/rust/pull/25496
7765 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7766 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7767 [inc]: https://github.com/rust-lang/rust/pull/25522
7768 [bh]: https://github.com/rust-lang/rust/pull/25856
7769 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7770 [ll]: https://github.com/rust-lang/rust/pull/26022
7771 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7772 [drop]: https://github.com/rust-lang/rust/pull/24935
7774 Version 1.0.0 (2015-05-15)
7775 ========================
7777 * ~1500 changes, numerous bugfixes
7782 * The vast majority of the standard library is now `#[stable]`. It is
7783 no longer possible to use unstable features with a stable build of
7785 * Many popular crates on [crates.io] now work on the stable release
7787 * Arithmetic on basic integer types now [checks for overflow in debug
7793 * Several [restrictions have been added to trait coherence][coh] in
7794 order to make it easier for upstream authors to change traits
7795 without breaking downstream code.
7796 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7797 improve error messages and macro behavior. For example, `0b1234` is
7798 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7799 * Trait bounds [are always invariant][inv], eliminating the need for
7800 the `PhantomFn` and `MarkerTrait` lang items, which have been
7802 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7803 "foo" as bar` syntax has been replaced with `extern crate foo as
7804 bar`, and Cargo now automatically translates "-" in *package* names
7805 to underscore for the crate name.
7806 * [Lifetime shadowing is an error][lt].
7807 * [`Send` no longer implies `'static`][send-rfc].
7808 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7809 `MyType::default()`.
7810 * Primitive types [now have inherent methods][prim-inherent],
7811 obviating the need for extension traits like `SliceExt`.
7812 * Methods with `Self: Sized` in their `where` clause are [considered
7813 object-safe][self-sized], allowing many extension traits like
7814 `IteratorExt` to be merged into the traits they extended.
7815 * You can now [refer to associated types][assoc-where] whose
7816 corresponding trait bounds appear only in a `where` clause.
7817 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7818 like `Send` and `Sync` are now library-defined.
7819 * A [Reflect trait][reflect] was introduced, which means that
7820 downcasting via the `Any` trait is effectively limited to concrete
7821 types. This helps retain the potentially-important "parametricity"
7822 property: generic code cannot behave differently for different type
7823 arguments except in minor ways.
7824 * The `unsafe_destructor` feature is now deprecated in favor of the
7825 [new `dropck`][dropck]. This change is a major reduction in unsafe
7831 * The `thread_local` module [has been renamed to `std::thread`][th].
7832 * The methods of `IteratorExt` [have been moved to the `Iterator`
7834 * Several traits that implement Rust's conventions for type
7835 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7836 [centralized in the `std::convert` module][con].
7837 * The `FromError` trait [was removed in favor of `From`][fe].
7838 * The basic sleep function [has moved to
7839 `std::thread::sleep_ms`][slp].
7840 * The `splitn` function now takes an `n` parameter that represents the
7841 number of items yielded by the returned iterator [instead of the
7842 number of 'splits'][spl].
7843 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7844 * [Derived implementations of `PartialOrd` now order enums according
7845 to their explicitly-assigned discriminants][po].
7846 * [Methods for searching strings are generic over `Pattern`s][pat],
7847 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7849 * [In method resolution, object methods are resolved before inherent
7851 * [`String::from_str` has been deprecated in favor of the `From` impl,
7852 `String::from`][sf].
7853 * [`io::Error` implements `Sync`][ios].
7854 * [The `words` method on `&str` has been replaced with
7855 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7857 * The new path and IO modules are complete and `#[stable]`. This
7858 was the major library focus for this cycle.
7859 * The path API was [revised][path-normalize] to normalize `.`,
7860 adjusting the tradeoffs in favor of the most common usage.
7861 * A large number of remaining APIs in `std` were also stabilized
7862 during this cycle; about 75% of the non-deprecated API surface
7864 * The new [string pattern API][string-pattern] landed, which makes
7865 the string slice API much more internally consistent and flexible.
7866 * A new set of [generic conversion traits][conversion] replaced
7867 many existing ad hoc traits.
7868 * Generic numeric traits were [completely removed][num-traits]. This
7869 was made possible thanks to inherent methods for primitive types,
7870 and the removal gives maximal flexibility for designing a numeric
7871 hierarchy in the future.
7872 * The `Fn` traits are now related via [inheritance][fn-inherit]
7873 and provide ergonomic [blanket implementations][fn-blanket].
7874 * The `Index` and `IndexMut` traits were changed to
7875 [take the index by value][index-value], enabling code like
7876 `hash_map["string"]` to work.
7877 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7878 `Copy` data is known to be `Clone` as well.
7883 * Many errors now have extended explanations that can be accessed with
7884 the `--explain` flag to `rustc`.
7885 * Many new examples have been added to the standard library
7887 * rustdoc has received a number of improvements focused on completion
7889 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7890 * Much headway was made on ecosystem-wide CI, making it possible
7891 to [compare builds for breakage][ci-compare].
7894 [crates.io]: http://crates.io
7895 [clo]: https://github.com/rust-lang/rust/pull/24034
7896 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7897 [con]: https://github.com/rust-lang/rust/pull/23875
7898 [cr]: https://github.com/rust-lang/rust/pull/23419
7899 [fe]: https://github.com/rust-lang/rust/pull/23879
7900 [ie]: https://github.com/rust-lang/rust/pull/23300
7901 [inv]: https://github.com/rust-lang/rust/pull/23938
7902 [ios]: https://github.com/rust-lang/rust/pull/24133
7903 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7904 [lt]: https://github.com/rust-lang/rust/pull/24057
7905 [meth]: https://github.com/rust-lang/rust/pull/24056
7906 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7907 [po]: https://github.com/rust-lang/rust/pull/24270
7908 [sf]: https://github.com/rust-lang/rust/pull/24517
7909 [slp]: https://github.com/rust-lang/rust/pull/23949
7910 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7911 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7912 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7913 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7914 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7915 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7916 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7917 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7918 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7919 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7920 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7921 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7922 [reflect]: https://github.com/rust-lang/rust/pull/23712
7923 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7924 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7925 [index-value]: https://github.com/rust-lang/rust/pull/23601
7926 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7927 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7928 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7929 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7930 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7931 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7934 Version 1.0.0-alpha.2 (2015-02-20)
7935 =====================================
7937 * ~1300 changes, numerous bugfixes
7941 * The various I/O modules were [overhauled][io-rfc] to reduce
7942 unnecessary abstractions and provide better interoperation with
7943 the underlying platform. The old `io` module remains temporarily
7945 * The standard library now [participates in feature gating][feat],
7946 so use of unstable libraries now requires a `#![feature(...)]`
7947 attribute. The impact of this change is [described on the
7948 forum][feat-forum]. [RFC][feat-rfc].
7952 * `for` loops [now operate on the `IntoIterator` trait][into],
7953 which eliminates the need to call `.iter()`, etc. to iterate
7954 over collections. There are some new subtleties to remember
7955 though regarding what sort of iterators various types yield, in
7956 particular that `for foo in bar { }` yields values from a move
7957 iterator, destroying the original collection. [RFC][into-rfc].
7958 * Objects now have [default lifetime bounds][obj], so you don't
7959 have to write `Box<Trait+'static>` when you don't care about
7960 storing references. [RFC][obj-rfc].
7961 * In types that implement `Drop`, [lifetimes must outlive the
7962 value][drop]. This will soon make it possible to safely
7963 implement `Drop` for types where `#[unsafe_destructor]` is now
7964 required. Read the [gorgeous RFC][drop-rfc] for details.
7965 * The fully qualified <T as Trait>::X syntax lets you set the Self
7966 type for a trait method or associated type. [RFC][ufcs-rfc].
7967 * References to types that implement `Deref<U>` now [automatically
7968 coerce to references][deref] to the dereferenced type `U`,
7969 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7970 should eliminate many unsightly uses of `&*`, as when converting
7971 from references to vectors into references to
7972 slices. [RFC][deref-rfc].
7973 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7974 `|:|`) is obsolete and closure kind is inferred from context.
7975 * [`Self` is a keyword][Self].
7979 * The `Show` and `String` formatting traits [have been
7980 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7981 their related purposes. Automatically getting a string
7982 conversion to use with `format!("{:?}", something_to_debug)` is
7983 now written `#[derive(Debug)]`.
7984 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7985 OsStr}`, provide strings in platform-specific encodings for easier
7986 interop with system APIs. [RFC][osstr-rfc].
7987 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7988 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7989 creating raw pointers.
7993 * Certain long error messages of the form 'expected foo found bar'
7994 are now [split neatly across multiple
7995 lines][multiline]. Examples in the PR.
7996 * On Unix Rust can be [uninstalled][un] by running
7997 `/usr/local/lib/rustlib/uninstall.sh`.
7998 * The `#[rustc_on_unimplemented]` attribute, requiring the
7999 'on_unimplemented' feature, lets rustc [display custom error
8000 messages when a trait is expected to be implemented for a type
8005 * Rust is tested against a [LALR grammar][lalr], which parses
8006 almost all the Rust files that rustc does.
8008 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8009 [close]: https://github.com/rust-lang/rust/pull/21843
8010 [deref]: https://github.com/rust-lang/rust/pull/21351
8011 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8012 [drop]: https://github.com/rust-lang/rust/pull/21972
8013 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8014 [feat]: https://github.com/rust-lang/rust/pull/21248
8015 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8016 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8017 [fmt]: https://github.com/rust-lang/rust/pull/21457
8018 [into]: https://github.com/rust-lang/rust/pull/20790
8019 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8020 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8021 [lalr]: https://github.com/rust-lang/rust/pull/21452
8022 [multiline]: https://github.com/rust-lang/rust/pull/19870
8023 [obj]: https://github.com/rust-lang/rust/pull/22230
8024 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8025 [onun]: https://github.com/rust-lang/rust/pull/20889
8026 [osstr]: https://github.com/rust-lang/rust/pull/21488
8027 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8028 [Self]: https://github.com/rust-lang/rust/pull/22158
8029 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8030 [un]: https://github.com/rust-lang/rust/pull/22256
8033 Version 1.0.0-alpha (2015-01-09)
8034 ==================================
8036 * ~2400 changes, numerous bugfixes
8040 * The language itself is considered feature complete for 1.0,
8041 though there will be many usability improvements and bugfixes
8042 before the final release.
8043 * Nearly 50% of the public API surface of the standard library has
8044 been declared 'stable'. Those interfaces are unlikely to change
8046 * The long-running debate over integer types has been
8047 [settled][ints]: Rust will ship with types named `isize` and
8048 `usize`, rather than `int` and `uint`, for pointer-sized
8049 integers. Guidelines will be rolled out during the alpha cycle.
8050 * Most crates that are not `std` have been moved out of the Rust
8051 distribution into the Cargo ecosystem so they can evolve
8052 separately and don't need to be stabilized as quickly, including
8053 'time', 'getopts', 'num', 'regex', and 'term'.
8054 * Documentation continues to be expanded with more API coverage, more
8055 examples, and more in-depth explanations. The guides have been
8056 consolidated into [The Rust Programming Language][trpl].
8057 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8058 * All official Rust binary installers now come with [Cargo], the
8059 Rust package manager.
8063 * Closures have been [completely redesigned][unboxed] to be
8064 implemented in terms of traits, can now be used as generic type
8065 bounds and thus monomorphized and inlined, or via an opaque
8066 pointer (boxed) as in the old system. The new system is often
8067 referred to as 'unboxed' closures.
8068 * Traits now support [associated types][assoc], allowing families
8069 of related types to be defined together and used generically in
8071 * Enum variants are [namespaced by their type names][enum].
8072 * [`where` clauses][where] provide a more versatile and attractive
8073 syntax for specifying generic bounds, though the previous syntax
8075 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8077 * Rust [no longer has a runtime][rt] of any description, and only
8078 supports OS threads, not green threads.
8079 * At long last, Rust has been overhauled for 'dynamically-sized
8080 types' ([DST]), which integrates 'fat pointers' (object types,
8081 arrays, and `str`) more deeply into the type system, making it
8083 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8084 `..j` that produce range types and which, when combined with the
8085 `Index` operator and multidispatch, leads to a convenient slice
8087 * The new range syntax revealed an ambiguity in the fixed-length
8088 array syntax, so now fixed length arrays [are written `[T;
8090 * The `Copy` trait is no longer implemented automatically. Unsafe
8091 pointers no longer implement `Sync` and `Send` so types
8092 containing them don't automatically either. `Sync` and `Send`
8093 are now 'unsafe traits' so one can "forcibly" implement them via
8094 `unsafe impl` if a type confirms to the requirements for them
8095 even though the internals do not (e.g. structs containing unsafe
8096 pointers like `Arc`). These changes are intended to prevent some
8097 footguns and are collectively known as [opt-in built-in
8098 traits][oibit] (though `Sync` and `Send` will soon become pure
8099 library types unknown to the compiler).
8100 * Operator traits now take their operands [by value][ops], and
8101 comparison traits can use multidispatch to compare one type
8102 against multiple other types, allowing e.g. `String` to be
8103 compared with `&str`.
8104 * `if let` and `while let` are no longer feature-gated.
8105 * Rust has adopted a more [uniform syntax for escaping unicode
8106 characters][unicode].
8107 * `macro_rules!` [has been declared stable][mac]. Though it is a
8108 flawed system it is sufficiently popular that it must be usable
8109 for 1.0. Effort has gone into [future-proofing][mac-future] it
8110 in ways that will allow other macro systems to be developed in
8111 parallel, and won't otherwise impact the evolution of the
8113 * The prelude has been [pared back significantly][prelude] such
8114 that it is the minimum necessary to support the most pervasive
8115 code patterns, and through [generalized where clauses][where]
8116 many of the prelude extension traits have been consolidated.
8117 * Rust's rudimentary reflection [has been removed][refl], as it
8118 incurred too much code generation for little benefit.
8119 * [Struct variants][structvars] are no longer feature-gated.
8120 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8121 known as 'higher-ranked trait bounds', this crucially allows
8122 unboxed closures to work.
8123 * Macros invocations surrounded by parens or square brackets and
8124 not terminated by a semicolon are [parsed as
8125 expressions][macros], which makes expressions like `vec![1i32,
8126 2, 3].len()` work as expected.
8127 * Trait objects now implement their traits automatically, and
8128 traits that can be coerced to objects now must be [object
8130 * Automatically deriving traits is now done with `#[derive(...)]`
8131 not `#[deriving(...)]` for [consistency with other naming
8132 conventions][derive].
8133 * Importing the containing module or enum at the same time as
8134 items or variants they contain is [now done with `self` instead
8135 of `mod`][self], as in use `foo::{self, bar}`
8136 * Glob imports are no longer feature-gated.
8137 * The `box` operator and `box` patterns have been feature-gated
8138 pending a redesign. For now unique boxes should be allocated
8139 like other containers, with `Box::new`.
8143 * A [series][coll1] of [efforts][coll2] to establish
8144 [conventions][coll3] for collections types has resulted in API
8145 improvements throughout the standard library.
8146 * New [APIs for error handling][err] provide ergonomic interop
8147 between error types, and [new conventions][err-conv] describe
8148 more clearly the recommended error handling strategies in Rust.
8149 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8150 it is easier to discuss failure in the context of error handling
8151 without making clarifications as to whether you are referring to
8152 the 'fail' macro or failure more generally.
8153 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8154 syscall when available.
8155 * The 'serialize' crate has been renamed 'rustc-serialize' and
8156 moved out of the distribution to Cargo. Although it is widely
8157 used now, it is expected to be superseded in the near future.
8158 * The `Show` formatter, typically implemented with
8159 `#[derive(Show)]` is [now requested with the `{:?}`
8160 specifier][show] and is intended for use by all types, for uses
8161 such as `println!` debugging. The new `String` formatter must be
8162 implemented by hand, uses the `{}` specifier, and is intended
8163 for full-fidelity conversions of things that can logically be
8164 represented as strings.
8168 * [Flexible target specification][flex] allows rustc's code
8169 generation to be configured to support otherwise-unsupported
8171 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8172 respective debuggers with Rust-appropriate pretty-printing.
8173 * The Windows installation of Rust is distributed with the
8174 MinGW components currently required to link binaries on that
8179 * Nullable enum optimizations have been extended to more types so
8180 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8181 space than the inner types themselves.
8182 * Work has begun on supporting AArch64.
8184 [Cargo]: https://crates.io
8185 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8186 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8187 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8188 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8189 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8190 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8191 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8192 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8193 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8194 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8195 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8196 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8197 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8198 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8199 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8200 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8201 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8202 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8203 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8204 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8205 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8206 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8207 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8208 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8209 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8210 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8211 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8212 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8213 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8214 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8215 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8216 [trpl]: https://doc.rust-lang.org/book/index.html
8217 [rbe]: http://rustbyexample.com/
8220 Version 0.12.0 (2014-10-09)
8221 =============================
8223 * ~1900 changes, numerous bugfixes
8227 * The introductory documentation (now called The Rust Guide) has
8228 been completely rewritten, as have a number of supplementary
8230 * Rust's package manager, Cargo, continues to improve and is
8231 sometimes considered to be quite awesome.
8232 * Many API's in `std` have been reviewed and updated for
8233 consistency with the in-development Rust coding
8234 guidelines. The standard library documentation tracks
8235 stabilization progress.
8236 * Minor libraries have been moved out-of-tree to the rust-lang org
8237 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8238 be installed with Cargo.
8239 * Lifetime elision allows lifetime annotations to be left off of
8240 function declarations in many common scenarios.
8241 * Rust now works on 64-bit Windows.
8244 * Indexing can be overloaded with the `Index` and `IndexMut`
8246 * The `if let` construct takes a branch only if the `let` pattern
8247 matches, currently behind the 'if_let' feature gate.
8248 * 'where clauses', a more flexible syntax for specifying trait
8249 bounds that is more aesthetic, have been added for traits and
8250 free functions. Where clauses will in the future make it
8251 possible to constrain associated types, which would be
8252 impossible with the existing syntax.
8253 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8254 the 'slicing_syntax' feature gate, and can be overloaded with
8255 the `Slice` or `SliceMut` traits.
8256 * The syntax for matching of sub-slices has been changed to use a
8257 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8258 consistency with other uses of `..` and to future-proof
8259 potential additional uses of the syntax.
8260 * The syntax for matching inclusive ranges in patterns has changed
8261 from `0..3` to `0...4` to be consistent with the exclusive range
8263 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8264 c]`) has been put behind the 'advanced_slice_patterns' feature
8265 gate and may be removed in the future.
8266 * Components of tuples and tuple structs can be extracted using
8267 the `value.0` syntax, currently behind the `tuple_indexing`
8269 * The `#[crate_id]` attribute is no longer supported; versioning
8270 is handled by the package manager.
8271 * Renaming crate imports are now written `extern crate foo as bar`
8272 instead of `extern crate bar = foo`.
8273 * Renaming use statements are now written `use foo as bar` instead
8275 * `let` and `match` bindings and argument names in macros are now
8277 * The new, more efficient, closure types ('unboxed closures') have
8278 been added under a feature gate, 'unboxed_closures'. These will
8279 soon replace the existing closure types, once higher-ranked
8280 trait lifetimes are added to the language.
8281 * `move` has been added as a keyword, for indicating closures
8282 that capture by value.
8283 * Mutation and assignment is no longer allowed in pattern guards.
8284 * Generic structs and enums can now have trait bounds.
8285 * The `Share` trait is now called `Sync` to free up the term
8286 'shared' to refer to 'shared reference' (the default reference
8288 * Dynamically-sized types have been mostly implemented,
8289 unifying the behavior of fat-pointer types with the rest of the
8291 * As part of dynamically-sized types, the `Sized` trait has been
8292 introduced, which qualifying types implement by default, and
8293 which type parameters expect by default. To specify that a type
8294 parameter does not need to be sized, write `<Sized? T>`. Most
8295 types are `Sized`, notable exceptions being unsized arrays
8296 (`[T]`) and trait types.
8297 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8298 * Lifetime bounds can now be applied to type parameters and object
8300 * The old, reference counted GC type, `Gc<T>` which was once
8301 denoted by the `@` sigil, has finally been removed. GC will be
8302 revisited in the future.
8305 * Library documentation has been improved for a number of modules.
8306 * Bit-vectors, collections::bitv has been modernized.
8307 * The url crate is deprecated in favor of
8308 http://github.com/servo/rust-url, which can be installed with
8310 * Most I/O stream types can be cloned and subsequently closed from
8312 * A `std::time::Duration` type has been added for use in I/O
8313 methods that rely on timers, as well as in the 'time' crate's
8314 `Timespec` arithmetic.
8315 * The runtime I/O abstraction layer that enabled the green thread
8316 scheduler to do non-thread-blocking I/O has been removed, along
8317 with the libuv-based implementation employed by the green thread
8318 scheduler. This will greatly simplify the future I/O work.
8319 * `collections::btree` has been rewritten to have a more
8320 idiomatic and efficient design.
8323 * rustdoc output now indicates the stability levels of API's.
8324 * The `--crate-name` flag can specify the name of the crate
8325 being compiled, like `#[crate_name]`.
8326 * The `-C metadata` specifies additional metadata to hash into
8327 symbol names, and `-C extra-filename` specifies additional
8328 information to put into the output filename, for use by the
8329 package manager for versioning.
8330 * debug info generation has continued to improve and should be
8331 more reliable under both gdb and lldb.
8332 * rustc has experimental support for compiling in parallel
8333 using the `-C codegen-units` flag.
8334 * rustc no longer encodes rpath information into binaries by
8338 * Stack usage has been optimized with LLVM lifetime annotations.
8339 * Official Rust binaries on Linux are more compatible with older
8340 kernels and distributions, built on CentOS 5.10.
8343 Version 0.11.0 (2014-07-02)
8344 ==========================
8346 * ~1700 changes, numerous bugfixes
8349 * ~[T] has been removed from the language. This type is superseded by
8351 * ~str has been removed from the language. This type is superseded by
8353 * ~T has been removed from the language. This type is superseded by the
8355 * @T has been removed from the language. This type is superseded by the
8356 standard library's std::gc::Gc<T> type.
8357 * Struct fields are now all private by default.
8358 * Vector indices and shift amounts are both required to be a `uint`
8359 instead of any integral type.
8360 * Byte character, byte string, and raw byte string literals are now all
8361 supported by prefixing the normal literal with a `b`.
8362 * Multiple ABIs are no longer allowed in an ABI string
8363 * The syntax for lifetimes on closures/procedures has been tweaked
8364 slightly: `<'a>|A, B|: 'b + K -> T`
8365 * Floating point modulus has been removed from the language; however it
8366 is still provided by a library implementation.
8367 * Private enum variants are now disallowed.
8368 * The `priv` keyword has been removed from the language.
8369 * A closure can no longer be invoked through a &-pointer.
8370 * The `use foo, bar, baz;` syntax has been removed from the language.
8371 * The transmute intrinsic no longer works on type parameters.
8372 * Statics now allow blocks/items in their definition.
8373 * Trait bounds are separated from objects with + instead of : now.
8374 * Objects can no longer be read while they are mutably borrowed.
8375 * The address of a static is now marked as insignificant unless the
8376 #[inline(never)] attribute is placed it.
8377 * The #[unsafe_destructor] attribute is now behind a feature gate.
8378 * Struct literals are no longer allowed in ambiguous positions such as
8379 if, while, match, and for..in.
8380 * Declaration of lang items and intrinsics are now feature-gated by
8382 * Integral literals no longer default to `int`, and floating point
8383 literals no longer default to `f64`. Literals must be suffixed with an
8384 appropriate type if inference cannot determine the type of the
8386 * The Box<T> type is no longer implicitly borrowed to &mut T.
8387 * Procedures are now required to not capture borrowed references.
8390 * The standard library is now a "facade" over a number of underlying
8391 libraries. This means that development on the standard library should
8392 be speedier due to smaller crates, as well as a clearer line between
8394 * A new library, libcore, lives under the standard library's facade
8395 which is Rust's "0-assumption" library, suitable for embedded and
8396 kernel development for example.
8397 * A regex crate has been added to the standard distribution. This crate
8398 includes statically compiled regular expressions.
8399 * The unwrap/unwrap_err methods on Result require a Show bound for
8400 better error messages.
8401 * The return types of the std::comm primitives have been centralized
8402 around the Result type.
8403 * A number of I/O primitives have gained the ability to time out their
8405 * A number of I/O primitives have gained the ability to close their
8406 reading/writing halves to cancel pending operations.
8407 * Reverse iterator methods have been removed in favor of `rev()` on
8408 their forward-iteration counterparts.
8409 * A bitflags! macro has been added to enable easy interop with C and
8410 management of bit flags.
8411 * A debug_assert! macro is now provided which is disabled when
8412 `--cfg ndebug` is passed to the compiler.
8413 * A graphviz crate has been added for creating .dot files.
8414 * The std::cast module has been migrated into std::mem.
8415 * The std::local_data api has been migrated from freestanding functions
8416 to being based on methods.
8417 * The Pod trait has been renamed to Copy.
8418 * jemalloc has been added as the default allocator for types.
8419 * The API for allocating memory has been changed to use proper alignment
8420 and sized deallocation
8421 * Connecting a TcpStream or binding a TcpListener is now based on a
8422 string address and a u16 port. This allows connecting to a hostname as
8424 * The Reader trait now contains a core method, read_at_least(), which
8425 correctly handles many repeated 0-length reads.
8426 * The process-spawning API is now centered around a builder-style
8428 * The :? printing qualifier has been moved from the standard library to
8429 an external libdebug crate.
8430 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8431 have been renamed to Eq/Ord.
8432 * The select/plural methods have been removed from format!. The escapes
8433 for { and } have also changed from \{ and \} to {{ and }},
8435 * The TaskBuilder API has been re-worked to be a true builder, and
8436 extension traits for spawning native/green tasks have been added.
8439 * All breaking changes to the language or libraries now have their
8440 commit message annotated with `[breaking-change]` to allow for easy
8441 discovery of breaking changes.
8442 * The compiler will now try to suggest how to annotate lifetimes if a
8443 lifetime-related error occurs.
8444 * Debug info continues to be improved greatly with general bug fixes and
8445 better support for situations like link time optimization (LTO).
8446 * Usage of syntax extensions when cross-compiling has been fixed.
8447 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8448 -fdata-sections and --gc-sections has been enabled by default
8449 * The compiler is now stricter about where it will load module files
8450 from when a module is declared via `mod foo;`.
8451 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8452 Syntax extensions are now discovered via a "plugin registrar" type
8453 which will be extended in the future to other various plugins.
8454 * Lints have been restructured to allow for dynamically loadable lints.
8455 * A number of rustdoc improvements:
8456 * The HTML output has been visually redesigned.
8457 * Markdown is now powered by hoedown instead of sundown.
8458 * Searching heuristics have been greatly improved.
8459 * The search index has been reduced in size by a great amount.
8460 * Cross-crate documentation via `pub use` has been greatly improved.
8461 * Primitive types are now hyperlinked and documented.
8462 * Documentation has been moved from static.rust-lang.org/doc to
8464 * A new sandbox, play.rust-lang.org, is available for running and
8465 sharing rust code examples on-line.
8466 * Unused attributes are now more robustly warned about.
8467 * The dead_code lint now warns about unused struct fields.
8468 * Cross-compiling to iOS is now supported.
8469 * Cross-compiling to mipsel is now supported.
8470 * Stability attributes are now inherited by default and no longer apply
8471 to intra-crate usage, only inter-crate usage.
8472 * Error message related to non-exhaustive match expressions have been
8476 Version 0.10 (2014-04-03)
8477 =========================
8479 * ~1500 changes, numerous bugfixes
8482 * A new RFC process is now in place for modifying the language.
8483 * Patterns with `@`-pointers have been removed from the language.
8484 * Patterns with unique vectors (`~[T]`) have been removed from the
8486 * Patterns with unique strings (`~str`) have been removed from the
8488 * `@str` has been removed from the language.
8489 * `@[T]` has been removed from the language.
8490 * `@self` has been removed from the language.
8491 * `@Trait` has been removed from the language.
8492 * Headers on `~` allocations which contain `@` boxes inside the type for
8493 reference counting have been removed.
8494 * The semantics around the lifetimes of temporary expressions have changed,
8495 see #3511 and #11585 for more information.
8496 * Cross-crate syntax extensions are now possible, but feature gated. See
8497 #11151 for more information. This includes both `macro_rules!` macros as
8498 well as syntax extensions such as `format!`.
8499 * New lint modes have been added, and older ones have been turned on to be
8501 * Unnecessary parentheses
8504 * Uppercase variables
8505 * Publicly visible private types
8506 * `#[deriving]` with raw pointers
8507 * Unsafe functions can no longer be coerced to closures.
8508 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8509 * The `#[simd]` attribute is now behind a feature gate.
8510 * Visibility is no longer allowed on `extern crate` statements, and
8511 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8512 * Trailing commas are now allowed in argument lists and tuple patterns.
8513 * The `do` keyword has been removed, it is now a reserved keyword.
8514 * Default type parameters have been implemented, but are feature gated.
8515 * Borrowed variables through captures in closures are now considered soundly.
8516 * `extern mod` is now `extern crate`
8517 * The `Freeze` trait has been removed.
8518 * The `Share` trait has been added for types that can be shared among
8520 * Labels in macros are now hygienic.
8521 * Expression/statement macro invocations can be delimited with `{}` now.
8522 * Treatment of types allowed in `static mut` locations has been tweaked.
8523 * The `*` and `.` operators are now overloadable through the `Deref` and
8525 * `~Trait` and `proc` no longer have `Send` bounds by default.
8526 * Partial type hints are now supported with the `_` type marker.
8527 * An `Unsafe` type was introduced for interior mutability. It is now
8528 considered undefined to transmute from `&T` to `&mut T` without using the
8530 * The #[linkage] attribute was implemented for extern statics/functions.
8531 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8532 * `Pod` was renamed to `Copy`.
8535 * The `libextra` library has been removed. It has now been decomposed into
8536 component libraries with smaller and more focused nuggets of
8537 functionality. The full list of libraries can be found on the
8538 documentation index page.
8539 * std: `std::condition` has been removed. All I/O errors are now propagated
8540 through the `Result` type. In order to assist with error handling, a
8541 `try!` macro for unwrapping errors with an early return and a lint for
8542 unused results has been added. See #12039 for more information.
8543 * std: The `vec` module has been renamed to `slice`.
8544 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8545 This will become the only growable vector in the future.
8546 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8547 are now found at `std::io::BufferedReader` instead of
8548 `std::io::buffered::BufferedReader`.
8549 * std: `print` and `println` are no longer in the prelude, the `print!` and
8550 `println!` macros are intended to be used instead.
8551 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8552 attempts to statically prevent cycles.
8553 * std: The standard distribution is adopting the policy of pushing failure
8554 to the user rather than failing in libraries. Many functions (such as
8555 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8556 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8557 deriving mode: `#[deriving(Show)]`.
8558 * std: `ToStr` is now implemented for all types implementing `Show`.
8559 * std: The formatting trait methods now take `&self` instead of `&T`
8560 * std: The `invert()` method on iterators has been renamed to `rev()`
8561 * std: `std::num` has seen a reduction in the genericity of its traits,
8562 consolidating functionality into a few core traits.
8563 * std: Backtraces are now printed on task failure if the environment
8564 variable `RUST_BACKTRACE` is present.
8565 * std: Naming conventions for iterators have been standardized. More details
8566 can be found on the wiki's style guide.
8567 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8568 still implement the function.
8569 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8570 * std: `assert_approx_eq!` has been removed
8571 * std: The `e` and `E` formatting specifiers for floats have been added to
8572 print them in exponential notation.
8573 * std: The `Times` trait has been removed
8574 * std: Indications of variance and opting out of builtin bounds is done
8575 through marker types in `std::kinds::marker` now
8576 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8577 `#[deriving(Hash)]` is now possible.
8578 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8579 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8580 * std: `Chan::new` is now `channel()`.
8581 * std: A new synchronous channel type has been implemented.
8582 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8583 * std: `hashmap` and `trie` have been moved to `libcollections`
8584 * std: `run` has been rolled into `io::process`
8585 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8586 * std: The equality and comparison traits have seen some reorganization.
8587 * std: `rand` has moved to `librand`.
8588 * std: `to_{lower,upper}case` has been implemented for `char`.
8589 * std: Logging has been moved to `liblog`.
8590 * collections: `HashMap` has been rewritten for higher performance and less
8592 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8593 it can be booted manually. The runtime guide has more information and
8595 * native: All I/O functionality except signals has been implemented.
8596 * green: Task spawning with `libgreen` has been optimized with stack caching
8597 and various trimming of code.
8598 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8599 * sync: The `extra::sync` module has been updated to modern rust (and moved
8600 to the `sync` library), tweaking and improving various interfaces while
8601 dropping redundant functionality.
8602 * sync: A new `Barrier` type has been added to the `sync` library.
8603 * sync: An efficient mutex for native and green tasks has been implemented.
8604 * serialize: The `base64` module has seen some improvement. It treats
8605 newlines better, has non-string error values, and has seen general
8607 * fourcc: A `fourcc!` macro was introduced
8608 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8609 hexadecimal literal.
8612 * `rustpkg` has been deprecated and removed from the main repository. Its
8613 replacement, `cargo`, is under development.
8614 * Nightly builds of rust are now available
8615 * The memory usage of rustc has been improved many times throughout this
8617 * The build process supports disabling rpath support for the rustc binary
8619 * Code generation has improved in some cases, giving more information to the
8620 LLVM optimization passes to enable more extensive optimizations.
8621 * Debuginfo compatibility with lldb on OSX has been restored.
8622 * The master branch is now gated on an android bot, making building for
8623 android much more reliable.
8624 * Output flags have been centralized into one `--emit` flag.
8625 * Crate type flags have been centralized into one `--crate-type` flag.
8626 * Codegen flags have been consolidated behind a `-C` flag.
8627 * Linking against outdated crates now has improved error messages.
8628 * Error messages with lifetimes will often suggest how to annotate the
8629 function to fix the error.
8630 * Many more types are documented in the standard library, and new guides
8632 * Many `rustdoc` improvements:
8633 * code blocks are syntax highlighted.
8634 * render standalone markdown files.
8635 * the --test flag tests all code blocks by default.
8636 * exported macros are displayed.
8637 * re-exported types have their documentation inlined at the location of the
8639 * search works across crates that have been rendered to the same output
8643 Version 0.9 (2014-01-09)
8644 ==========================
8646 * ~1800 changes, numerous bugfixes
8649 * The `float` type has been removed. Use `f32` or `f64` instead.
8650 * A new facility for enabling experimental features (feature gating) has
8651 been added, using the crate-level `#[feature(foo)]` attribute.
8652 * Managed boxes (@) are now behind a feature gate
8653 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8654 standard library's `Gc` or `Rc` types instead.
8655 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8656 * Jumping back to the top of a loop is now done with `continue` instead of
8658 * Strings can no longer be mutated through index assignment.
8659 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8660 hash delimiters, as in `r###"foo"###`.
8661 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8663 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8664 * `@fn`s have been removed.
8665 * `do` only works with procs in order to make it obvious what the cost
8667 * Single-element tuple-like structs can no longer be dereferenced to
8668 obtain the inner value. A more comprehensive solution for overloading
8669 the dereference operator will be provided in the future.
8670 * The `#[link(...)]` attribute has been replaced with
8671 `#[crate_id = "name#vers"]`.
8672 * Empty `impl`s must be terminated with empty braces and may not be
8673 terminated with a semicolon.
8674 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8675 no longer has any special meaning.
8676 * The old `fmt!` string formatting macro has been removed.
8677 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8678 `print!` and `println!`.
8679 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8680 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8681 `extern mod foo = "bar"` instead.
8682 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8683 * Macros can have attributes.
8684 * Macros can expand to items with attributes.
8685 * Macros can expand to multiple items.
8686 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8687 * Comments may be nested.
8688 * Values automatically coerce to trait objects they implement, without
8690 * Enum discriminants are no longer an entire word but as small as needed to
8691 contain all the variants. The `repr` attribute can be used to override
8692 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8693 `#[repr(C)]` to match C enums.
8694 * Non-string literals are not allowed in attributes (they never worked).
8695 * The FFI now supports variadic functions.
8696 * Octal numeric literals, as in `0o7777`.
8697 * The `concat!` syntax extension performs compile-time string concatenation.
8698 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8699 removed as Rust no longer uses segmented stacks.
8700 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8701 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8702 not `*`; ignoring remaining fields of a struct is also done with `..`,
8703 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8704 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8705 * `rustc` supports the "system" calling convention, which defaults to the
8706 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8708 * The `type_overflow` lint (default: warn) checks literals for overflow.
8709 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8710 * The `attribute_usage` lint (default: warn) warns about unknown
8712 * The `unknown_features` lint (default: warn) warns about unknown
8714 * The `dead_code` lint (default: warn) checks for dead code.
8715 * Rust libraries can be linked statically to one another
8716 * `#[link_args]` is behind the `link_args` feature gate.
8717 * Native libraries are now linked with `#[link(name = "foo")]`
8718 * Native libraries can be statically linked to a rust crate
8719 (`#[link(name = "foo", kind = "static")]`).
8720 * Native OS X frameworks are now officially supported
8721 (`#[link(name = "foo", kind = "framework")]`).
8722 * The `#[thread_local]` attribute creates thread-local (not task-local)
8723 variables. Currently behind the `thread_local` feature gate.
8724 * The `return` keyword may be used in closures.
8725 * Types that can be copied via a memcpy implement the `Pod` kind.
8726 * The `cfg` attribute can now be used on struct fields and enum variants.
8729 * std: The `option` and `result` API's have been overhauled to make them
8730 simpler, more consistent, and more composable.
8731 * std: The entire `std::io` module has been replaced with one that is
8732 more comprehensive and that properly interfaces with the underlying
8733 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8735 * std: `io::util` contains a number of useful implementations of
8736 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8737 `ZeroReader`, `TeeReader`.
8738 * std: The reference counted pointer type `extra::rc` moved into std.
8739 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8740 just a wrapper around it).
8741 * std: The `Either` type has been removed.
8742 * std: `fmt::Default` can be implemented for any type to provide default
8743 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8744 * std: The `rand` API continues to be tweaked.
8745 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8746 on failure in gdb, is now named `rust_fail`.
8747 * std: The `each_key` and `each_value` methods on `HashMap` have been
8748 replaced by the `keys` and `values` iterators.
8749 * std: Functions dealing with type size and alignment have moved from the
8750 `sys` module to the `mem` module.
8751 * std: The `path` module was written and API changed.
8752 * std: `str::from_utf8` has been changed to cast instead of allocate.
8753 * std: `starts_with` and `ends_with` methods added to vectors via the
8754 `ImmutableEqVector` trait, which is in the prelude.
8755 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8756 if the index is out of bounds.
8757 * std: Task failure no longer propagates between tasks, as the model was
8758 complex, expensive, and incompatible with thread-based tasks.
8759 * std: The `Any` type can be used for dynamic typing.
8760 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8762 * std: Methods that produce iterators generally do not have an `_iter`
8764 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8765 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8766 * std: `util::ignore` renamed to `prelude::drop`.
8767 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8769 * std: `vec::raw` has seen a lot of cleanup and API changes.
8770 * std: The standard library no longer includes any C++ code, and very
8771 minimal C, eliminating the dependency on libstdc++.
8772 * std: Runtime scheduling and I/O functionality has been factored out into
8773 extensible interfaces and is now implemented by two different crates:
8774 libnative, for native threading and I/O; and libgreen, for green threading
8775 and I/O. This paves the way for using the standard library in more limited
8776 embedded environments.
8777 * std: The `comm` module has been rewritten to be much faster, have a
8778 simpler, more consistent API, and to work for both native and green
8780 * std: All libuv dependencies have been moved into the rustuv crate.
8781 * native: New implementations of runtime scheduling on top of OS threads.
8782 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8784 * green: The green thread scheduler and message passing types are almost
8786 * extra: The `flatpipes` module had bitrotted and was removed.
8787 * extra: All crypto functions have been removed and Rust now has a policy of
8788 not reimplementing crypto in the standard library. In the future crypto
8789 will be provided by external crates with bindings to established libraries.
8790 * extra: `c_vec` has been modernized.
8791 * extra: The `sort` module has been removed. Use the `sort` method on
8795 * The `rust` and `rusti` commands have been removed, due to lack of
8797 * `rustdoc` was completely rewritten.
8798 * `rustdoc` can test code examples in documentation.
8799 * `rustpkg` can test packages with the argument, 'test'.
8800 * `rustpkg` supports arbitrary dependencies, including C libraries.
8801 * `rustc`'s support for generating debug info is improved again.
8802 * `rustc` has better error reporting for unbalanced delimiters.
8803 * `rustc`'s JIT support was removed due to bitrot.
8804 * Executables and static libraries can be built with LTO (-Z lto)
8805 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8809 Version 0.8 (2013-09-26)
8810 ============================
8812 * ~2200 changes, numerous bugfixes
8815 * The `for` loop syntax has changed to work with the `Iterator` trait.
8816 * At long last, unwinding works on Windows.
8817 * Default methods are ready for use.
8818 * Many trait inheritance bugs fixed.
8819 * Owned and borrowed trait objects work more reliably.
8820 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8821 * rustc can omit emission of code for the `debug!` macro if it is passed
8823 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8824 for foo.rs, then foo/mod.rs, and will generate an error when both are
8826 * Strings no longer contain trailing nulls. The new `std::c_str` module
8827 provides new mechanisms for converting to C strings.
8828 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8829 * The FFI has been overhauled such that foreign functions are called directly,
8830 instead of through a stack-switching wrapper.
8831 * Calling a foreign function must be done through a Rust function with the
8832 `#[fixed_stack_segment]` attribute.
8833 * The `externfn!` macro can be used to declare both a foreign function and
8834 a `#[fixed_stack_segment]` wrapper at once.
8835 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8836 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8837 * `priv` is disallowed everywhere except for struct fields and enum variants.
8838 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8839 * `ref` bindings in irrefutable patterns work correctly now.
8840 * `char` is now prevented from containing invalid code points.
8841 * Casting to `bool` is no longer allowed.
8842 * `\0` is now accepted as an escape in chars and strings.
8843 * `yield` is a reserved keyword.
8844 * `typeof` is a reserved keyword.
8845 * Crates may be imported by URL with `extern mod foo = "url";`.
8846 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8847 * Static vectors can be initialized with repeating elements,
8848 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8849 * Static structs can be initialized with functional record update,
8850 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8851 * `cfg!` can be used to conditionally execute code based on the crate
8852 configuration, similarly to `#[cfg(...)]`.
8853 * The `unnecessary_qualification` lint detects unneeded module
8854 prefixes (default: allow).
8855 * Arithmetic operations have been implemented on the SIMD types in
8856 `std::unstable::simd`.
8857 * Exchange allocation headers were removed, reducing memory usage.
8858 * `format!` implements a completely new, extensible, and higher-performance
8859 string formatting system. It will replace `fmt!`.
8860 * `print!` and `println!` write formatted strings (using the `format!`
8861 extension) to stdout.
8862 * `write!` and `writeln!` write formatted strings (using the `format!`
8863 extension) to the new Writers in `std::rt::io`.
8864 * The library section in which a function or static is placed may
8865 be specified with `#[link_section = "..."]`.
8866 * The `proto!` syntax extension for defining bounded message protocols
8868 * `macro_rules!` is hygienic for `let` declarations.
8869 * The `#[export_name]` attribute specifies the name of a symbol.
8870 * `unreachable!` can be used to indicate unreachable code, and fails
8874 * std: Transitioned to the new runtime, written in Rust.
8875 * std: Added an experimental I/O library, `rt::io`, based on the new
8877 * std: A new generic `range` function was added to the prelude, replacing
8878 `uint::range` and friends.
8879 * std: `range_rev` no longer exists. Since range is an iterator it can be
8880 reversed with `range(lo, hi).invert()`.
8881 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8882 renamed to `unwrap_or`.
8883 * std: The `iterator` module was renamed to `iter`.
8884 * std: Integral types now support the `checked_add`, `checked_sub`, and
8885 `checked_mul` operations for detecting overflow.
8886 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8888 * std: Methods are standardizing on conventions for casting methods:
8889 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8891 * std: The `CString` type in `c_str` provides new ways to convert to and
8893 * std: `DoubleEndedIterator` can yield elements in two directions.
8894 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8896 * std: `str::from_bytes` renamed to `str::from_utf8`.
8897 * std: `pop_opt` and `shift_opt` methods added to vectors.
8898 * std: The task-local data interface no longer uses @, and keys are
8899 no longer function pointers.
8900 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8901 * std: Added `SharedPort` to `comm`.
8902 * std: `Eq` has a default method for `ne`; only `eq` is required
8904 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8905 is required in implementations.
8906 * std: `is_utf8` performance is improved, impacting many string functions.
8907 * std: `os::MemoryMap` provides cross-platform mmap.
8908 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8909 are not 'in-bounds' are considered undefined.
8910 * std: Many freestanding functions in `vec` removed in favor of methods.
8911 * std: Many freestanding functions on scalar types removed in favor of
8913 * std: Many options to task builders were removed since they don't make
8914 sense in the new scheduler design.
8915 * std: More containers implement `FromIterator` so can be created by the
8917 * std: More complete atomic types in `unstable::atomics`.
8918 * std: `comm::PortSet` removed.
8919 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8920 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8921 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8922 default implementations.
8923 * std: Various `from_str` functions were removed in favor of a generic
8924 `from_str` which is available in the prelude.
8925 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8926 * extra: `dlist`, the doubly-linked list was modernized.
8927 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8928 * extra: Added `glob` module, replacing `std::os::glob`.
8929 * extra: `rope` was removed.
8930 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8931 * extra: `net`, and `timer` were removed. The experimental replacements
8932 are `std::rt::io::net` and `std::rt::io::timer`.
8933 * extra: Iterators implemented for `SmallIntMap`.
8934 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8935 * extra: `SmallIntSet` removed. Use `BitvSet`.
8936 * extra: Performance of JSON parsing greatly improved.
8937 * extra: `semver` updated to SemVer 2.0.0.
8938 * extra: `term` handles more terminals correctly.
8939 * extra: `dbg` module removed.
8940 * extra: `par` module removed.
8941 * extra: `future` was cleaned up, with some method renames.
8942 * extra: Most free functions in `getopts` were converted to methods.
8945 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8946 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8947 similarly to gcc's `--march` flag.
8948 * rustc's performance compiling small crates is much better.
8949 * rustpkg has received many improvements.
8950 * rustpkg supports git tags as package IDs.
8951 * rustpkg builds into target-specific directories so it can be used for
8953 * The number of concurrent test tasks is controlled by the environment
8954 variable RUST_TEST_TASKS.
8955 * The test harness can now report metrics for benchmarks.
8956 * All tools have man pages.
8957 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8958 * The runtime uses jemalloc for allocations.
8959 * Segmented stacks are temporarily disabled as part of the transition to
8960 the new runtime. Stack overflows are possible!
8961 * A new documentation backend, rustdoc_ng, is available for use. It is
8962 still invoked through the normal `rustdoc` command.
8965 Version 0.7 (2013-07-03)
8966 =======================
8968 * ~2000 changes, numerous bugfixes
8971 * `impl`s no longer accept a visibility qualifier. Put them on methods
8973 * The borrow checker has been rewritten with flow-sensitivity, fixing
8974 many bugs and inconveniences.
8975 * The `self` parameter no longer implicitly means `&'self self`,
8976 and can be explicitly marked with a lifetime.
8977 * Overloadable compound operators (`+=`, etc.) have been temporarily
8978 removed due to bugs.
8979 * The `for` loop protocol now requires `for`-iterators to return `bool`
8980 so they compose better.
8981 * The `Durable` trait is replaced with the `'static` bounds.
8982 * Trait default methods work more often.
8983 * Structs with the `#[packed]` attribute have byte alignment and
8984 no padding between fields.
8985 * Type parameters bound by `Copy` must now be copied explicitly with
8987 * It is now illegal to move out of a dereferenced unsafe pointer.
8988 * `Option<~T>` is now represented as a nullable pointer.
8989 * `@mut` does dynamic borrow checks correctly.
8990 * The `main` function is only detected at the topmost level of the crate.
8991 The `#[main]` attribute is still valid anywhere.
8992 * Struct fields may no longer be mutable. Use inherited mutability.
8993 * The `#[no_send]` attribute makes a type that would otherwise be
8995 * The `#[no_freeze]` attribute makes a type that would otherwise be
8997 * Unbounded recursion will abort the process after reaching the limit
8998 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8999 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9000 are never implicitly copyable.
9001 * `#[static_assert]` makes compile-time assertions about static bools.
9002 * At long last, 'argument modes' no longer exist.
9003 * The rarely used `use mod` statement no longer exists.
9006 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9008 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9009 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9011 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9012 and unsuffixed integer literals.
9015 * The `core` crate was renamed to `std`.
9016 * The `std` crate was renamed to `extra`.
9017 * More and improved documentation.
9018 * std: `iterator` module for external iterator objects.
9019 * Many old-style (internal, higher-order function) iterators replaced by
9020 implementations of `Iterator`.
9021 * std: Many old internal vector and string iterators,
9022 incl. `any`, `all`. removed.
9023 * std: The `finalize` method of `Drop` renamed to `drop`.
9024 * std: The `drop` method now takes `&mut self` instead of `&self`.
9025 * std: The prelude no longer re-exports any modules, only types and traits.
9026 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9027 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9028 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9029 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9030 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9031 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9032 * std: Many types implement `Clone`.
9033 * std: `path` type renamed to `Path`.
9034 * std: `mut` module and `Mut` type removed.
9035 * std: Many standalone functions removed in favor of methods and iterators
9036 in `vec`, `str`. In the future methods will also work as functions.
9037 * std: `reinterpret_cast` removed. Use `transmute`.
9038 * std: ascii string handling in `std::ascii`.
9039 * std: `Rand` is implemented for ~/@.
9040 * std: `run` module for spawning processes overhauled.
9041 * std: Various atomic types added to `unstable::atomic`.
9042 * std: Various types implement `Zero`.
9043 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9044 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9045 * std: Added `os::mkdir_recursive`.
9046 * std: Added `os::glob` function performs filesystems globs.
9047 * std: `FuzzyEq` renamed to `ApproxEq`.
9048 * std: `Map` now defines `pop` and `swap` methods.
9049 * std: `Cell` constructors converted to static methods.
9050 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9051 * extra: `flate` module moved from `std` to `extra`.
9052 * extra: `fileinput` module for iterating over a series of files.
9053 * extra: `Complex` number type and `complex` module.
9054 * extra: `Rational` number type and `rational` module.
9055 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9056 * extra: `term` uses terminfo now, is more correct.
9057 * extra: `arc` functions converted to methods.
9058 * extra: Implementation of fixed output size variations of SHA-2.
9061 * `unused_variables` lint mode for unused variables (default: warn).
9062 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9064 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9066 * `dead_assignment` lint mode for unread variables (default: warn).
9067 * `unnecessary_allocation` lint mode detects some heap allocations that are
9068 immediately borrowed so could be written without allocating (default: warn).
9069 * `missing_doc` lint mode (default: allow).
9070 * `unreachable_code` lint mode (default: warn).
9071 * The `rusti` command has been rewritten and a number of bugs addressed.
9072 * rustc outputs in color on more terminals.
9073 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9074 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9075 * Compiling with `-g` will make the binary record information about
9076 dynamic borrowcheck failures for debugging.
9077 * rustdoc has a nicer stylesheet.
9078 * Various improvements to rustdoc.
9079 * Improvements to rustpkg (see the detailed release notes).
9082 Version 0.6 (2013-04-03)
9083 ========================
9085 * ~2100 changes, numerous bugfixes
9088 * The self type parameter in traits is now spelled `Self`
9089 * The `self` parameter in trait and impl methods must now be explicitly
9090 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9091 * Static methods no longer require the `static` keyword and instead
9092 are distinguished by the lack of a `self` parameter
9093 * Replaced the `Durable` trait with the `'static` lifetime
9094 * The old closure type syntax with the trailing sigil has been
9095 removed in favor of the more consistent leading sigil
9096 * `super` is a keyword, and may be prefixed to paths
9097 * Trait bounds are separated with `+` instead of whitespace
9098 * Traits are implemented with `impl Trait for Type`
9099 instead of `impl Type: Trait`
9100 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9101 * The `export` keyword has finally been removed
9102 * The `move` keyword has been removed (see "Semantic changes")
9103 * The interior mutability qualifier on vectors, `[mut T]`, has been
9104 removed. Use `&mut [T]`, etc.
9105 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9106 * `fail` is no longer a keyword. Use `fail!()`
9107 * `assert` is no longer a keyword. Use `assert!()`
9108 * `log` is no longer a keyword. use `debug!`, etc.
9109 * 1-tuples may be represented as `(T,)`
9110 * Struct fields may no longer be `mut`. Use inherited mutability,
9111 `@mut T`, `core::mut` or `core::cell`
9112 * `extern mod { ... }` is no longer valid syntax for foreign
9113 function modules. Use extern blocks: `extern { ... }`
9114 * Newtype enums removed. Use tuple-structs.
9115 * Trait implementations no longer support visibility modifiers
9116 * Pattern matching over vectors improved and expanded
9117 * `const` renamed to `static` to correspond to lifetime name,
9118 and make room for future `static mut` unsafe mutable globals.
9119 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9120 * `Clone` implementations can be automatically generated with
9121 `#[deriving(Clone)]`
9122 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9123 instead of `foo as Bar`.
9124 * Fixed length vector types are now written as `[int, .. 3]`
9125 instead of `[int * 3]`.
9126 * Fixed length vector types can express the length as a constant
9127 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9130 * Types with owned pointers or custom destructors move by default,
9131 eliminating the `move` keyword
9132 * All foreign functions are considered unsafe
9133 * &mut is now unaliasable
9134 * Writes to borrowed @mut pointers are prevented dynamically
9136 * The name of the main function can be customized using #[main]
9137 * The default type of an inferred closure is &fn instead of @fn
9138 * `use` statements may no longer be "chained" - they cannot import
9139 identifiers imported by previous `use` statements
9140 * `use` statements are crate relative, importing from the "top"
9141 of the crate by default. Paths may be prefixed with `super::`
9142 or `self::` to change the search behavior.
9143 * Method visibility is inherited from the implementation declaration
9144 * Structural records have been removed
9145 * Many more types can be used in static items, including enums
9146 'static-lifetime pointers and vectors
9147 * Pattern matching over vectors improved and expanded
9148 * Typechecking of closure types has been overhauled to
9149 improve inference and eliminate unsoundness
9150 * Macros leave scope at the end of modules, unless that module is
9151 tagged with #[macro_escape]
9154 * Added big integers to `std::bigint`
9155 * Removed `core::oldcomm` module
9156 * Added pipe-based `core::comm` module
9157 * Numeric traits have been reorganized under `core::num`
9158 * `vec::slice` finally returns a slice
9159 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9160 * Containers reorganized around traits in `core::container`
9161 * `core::dvec` removed, `~[T]` is a drop-in replacement
9162 * `core::send_map` renamed to `core::hashmap`
9163 * `std::map` removed; replaced with `core::hashmap`
9164 * `std::treemap` reimplemented as an owned balanced tree
9165 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9166 * `core::trie` added as a fast ordered map for integer keys
9167 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9168 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9169 overload the comparison operators, whereas `TotalOrd` is used
9170 by certain container types
9173 * Replaced the 'cargo' package manager with 'rustpkg'
9174 * Added all-purpose 'rust' tool
9175 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9176 * rustc now *attempts* to offer spelling suggestions
9177 * Improved support for ARM and Android
9178 * Preliminary MIPS backend
9179 * Improved foreign function ABI implementation for x86, x86_64
9180 * Various memory usage improvements
9181 * Rust code may be embedded in foreign code under limited circumstances
9182 * Inline assembler supported by new asm!() syntax extension.
9185 Version 0.5 (2012-12-21)
9186 ===========================
9188 * ~900 changes, numerous bugfixes
9191 * Removed `<-` move operator
9192 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9193 * Removed old fixed length vector syntax - `[T]/N`
9194 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9195 * Macros may now expand to items and statements
9196 * `a.b()` is always parsed as a method call, never as a field projection
9197 * `Eq` and `IterBytes` implementations can be automatically generated
9198 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9199 * Removed the special crate language for `.rc` files
9200 * Function arguments may consist of any irrefutable pattern
9203 * `&` and `~` pointers may point to objects
9204 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9205 * Enum variants may be structs
9206 * Destructors can be added to all nominal types with the Drop trait
9207 * Structs and nullary enum variants may be constants
9208 * Values that cannot be implicitly copied are now automatically moved
9209 without writing `move` explicitly
9210 * `&T` may now be coerced to `*T`
9211 * Coercions happen in `let` statements as well as function calls
9212 * `use` statements now take crate-relative paths
9213 * The module and type namespaces have been merged so that static
9214 method names can be resolved under the trait in which they are
9217 * Improved support for language features
9218 * Trait inheritance works in many scenarios
9219 * More support for explicit self arguments in methods - `self`, `&self`
9220 `@self`, and `~self` all generally work as expected
9221 * Static methods work in more situations
9222 * Experimental: Traits may declare default methods for the implementations
9226 * New condition handling system in `core::condition`
9227 * Timsort added to `std::sort`
9228 * New priority queue, `std::priority_queue`
9229 * Pipes for serializable types, `std::flatpipes'
9230 * Serialization overhauled to be trait-based
9231 * Expanded `getopts` definitions
9232 * Moved futures to `std`
9233 * More functions are pure now
9234 * `core::comm` renamed to `oldcomm`. Still deprecated
9235 * `rustdoc` and `cargo` are libraries now
9238 * Added a preliminary REPL, `rusti`
9239 * License changed from MIT to dual MIT/APL2
9242 Version 0.4 (2012-10-15)
9243 ==========================
9245 * ~2000 changes, numerous bugfixes
9248 * All keywords are now strict and may not be used as identifiers anywhere
9249 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9250 'of', 'with', 'to', 'class'.
9251 * Classes are replaced with simpler structs
9252 * Explicit method self types
9253 * `ret` became `return` and `alt` became `match`
9254 * `import` is now `use`; `use is now `extern mod`
9255 * `extern mod { ... }` is now `extern { ... }`
9256 * `use mod` is the recommended way to import modules
9257 * `pub` and `priv` replace deprecated export lists
9258 * The syntax of `match` pattern arms now uses fat arrow (=>)
9259 * `main` no longer accepts an args vector; use `os::args` instead
9262 * Trait implementations are now coherent, ala Haskell typeclasses
9263 * Trait methods may be static
9264 * Argument modes are deprecated
9265 * Borrowed pointers are much more mature and recommended for use
9266 * Strings and vectors in the static region are stored in constant memory
9267 * Typestate was removed
9268 * Resolution rewritten to be more reliable
9269 * Support for 'dual-mode' data structures (freezing and thawing)
9272 * Most binary operators can now be overloaded via the traits in
9274 * `std::net::url` for representing URLs
9275 * Sendable hash maps in `core::send_map`
9276 * `core::task' gained a (currently unsafe) task-local storage API
9279 * An efficient new intertask communication primitive called the pipe,
9280 along with a number of higher-level channel types, in `core::pipes`
9281 * `std::arc`, an atomically reference counted, immutable, shared memory
9283 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9284 * Futures are now based on pipes and sendable
9285 * More robust linked task failure
9286 * Improved task builder API
9289 * Improved error reporting
9290 * Preliminary JIT support
9291 * Preliminary work on precise GC
9292 * Extensive architectural improvements to rustc
9293 * Begun a transition away from buggy C++-based reflection (shape) code to
9294 Rust-based (visitor) code
9295 * All hash functions and tables converted to secure, randomized SipHash
9298 Version 0.3 (2012-07-12)
9299 ========================
9301 * ~1900 changes, numerous bugfixes
9303 * New coding conveniences
9304 * Integer-literal suffix inference
9305 * Per-item control over warnings, errors
9306 * #[cfg(windows)] and #[cfg(unix)] attributes
9307 * Documentation comments
9308 * More compact closure syntax
9309 * 'do' expressions for treating higher-order functions as
9311 * *-patterns (wildcard extended to all constructor fields)
9314 * Name resolution pass and exhaustiveness checker rewritten
9315 * Region pointers and borrow checking supersede alias
9317 * Init-ness checking is now provided by a region-based liveness
9318 pass instead of the typestate pass; same for last-use analysis
9319 * Extensive work on region pointers
9321 * Experimental new language features
9322 * Slices and fixed-size, interior-allocated vectors
9323 * #!-comments for lang versioning, shell execution
9324 * Destructors and iface implementation for classes;
9325 type-parameterized classes and class methods
9326 * 'const' type kind for types that can be used to implement
9327 shared-memory concurrency patterns
9331 * Removal of various obsolete features
9332 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9333 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9335 * Constructs: do-while loops ('do' repurposed), fn binding,
9336 resources (replaced by destructors)
9338 * Compiler reorganization
9339 * Syntax-layer of compiler split into separate crate
9340 * Clang (from LLVM project) integrated into build
9341 * Typechecker split into sub-modules
9344 * New time functions
9345 * Extension methods for many built-in types
9346 * Arc: atomic-refcount read-only / exclusive-use shared cells
9347 * Par: parallel map and search routines
9348 * Extensive work on libuv interface
9349 * Much vector code moved to libraries
9350 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9351 #include, #include_str, #include_bin
9354 * Cargo automatically resolves dependencies
9357 Version 0.2 (2012-03-29)
9358 =========================
9360 * >1500 changes, numerous bugfixes
9362 * New docs and doc tooling
9364 * New port: FreeBSD x86_64
9366 * Compilation model enhancements
9367 * Generics now specialized, multiply instantiated
9368 * Functions now inlined across separate crates
9370 * Scheduling, stack and threading fixes
9371 * Noticeably improved message-passing performance
9372 * Explicit schedulers
9376 * Experimental new language features
9377 * Operator overloading
9381 * Various language extensions
9382 * C-callback function types: 'crust fn ...'
9383 * Infinite-loop construct: 'loop { ... }'
9384 * Shorten 'mutable' to 'mut'
9385 * Required mutable-local qualifier: 'let mut ...'
9386 * Basic glob-exporting: 'export foo::*;'
9387 * Alt now exhaustive, 'alt check' for runtime-checked
9388 * Block-function form of 'for' loop, with 'break' and 'ret'.
9391 * AST quasi-quote syntax extension
9392 * Revived libuv interface
9393 * New modules: core::{future, iter}, std::arena
9394 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9395 * Extensive cleanup, regularization in libstd, libcore
9398 Version 0.1 (2012-01-20)
9399 ===============================
9401 * Most language features work, including:
9402 * Unique pointers, unique closures, move semantics
9403 * Interface-constrained generics
9404 * Static interface dispatch
9406 * Multithread task scheduling
9407 * Typestate predicates
9408 * Failure unwinding, destructors
9409 * Pattern matching and destructuring assignment
9410 * Lightweight block-lambda syntax
9411 * Preliminary macro-by-example
9413 * Compiler works with the following configurations:
9414 * Linux: x86 and x86_64 hosts and targets
9415 * macOS: x86 and x86_64 hosts and targets
9416 * Windows: x86 hosts and targets
9418 * Cross compilation / multi-target configuration supported.
9420 * Preliminary API-documentation and package-management tools included.
9424 * Documentation is incomplete.
9426 * Performance is below intended target.
9428 * Standard library APIs are subject to extensive change, reorganization.
9430 * Language-level versioning is not yet operational - future code will