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>` compiler flag.][76158] This tells
13 `rustc` whether to link its own C runtime and libraries or to rely on a external
14 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
15 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
16 Note: If you're using cargo you must explicitly pass the `--target` flag.
17 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
19 \* Refer to Rust's [platform support page][forge-platform-support] for more
20 information on Rust's tiered platform support.
24 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
25 and `&Stderr`.][76275]
26 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
27 - [The `matches!` macro now supports having a trailing comma.][74880]
28 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
29 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
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 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
65 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
66 promoted to `'static` lifetime any more inside `const fn`s.
67 - [Associated type bindings on trait objects are now verified to meet the bounds
68 declared on the trait when checking that they implement the trait.][27675]
69 - [When trait bounds on associated types or opaque types are ambiguous, the
70 compiler no longer makes an arbitrary choice on which bound to use.][54121]
71 - [Fixed recursive nonterminals not being expanded in macros during
72 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
73 correctly handling recursive nonterminal tokens.
74 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
75 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
76 in places where they have no effect.][73461]
77 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
78 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
79 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
80 disallow zero-initialization.][71274]
81 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
82 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
83 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
84 see the [`catch_unwind`] documentation for further information.
90 These changes provide no direct user facing benefits, but represent significant
91 improvements to the internals and overall performance of rustc and
94 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
95 You can continue building with `make` by setting `ninja=false` in
97 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
98 - [Made `ensure_sufficient_stack()` non-generic][76680]
100 [78143]: https://github.com/rust-lang/rust/issues/78143
101 [76680]: https://github.com/rust-lang/rust/pull/76680/
102 [76030]: https://github.com/rust-lang/rust/pull/76030/
103 [70212]: https://github.com/rust-lang/rust/pull/70212/
104 [27675]: https://github.com/rust-lang/rust/issues/27675/
105 [54121]: https://github.com/rust-lang/rust/issues/54121/
106 [71274]: https://github.com/rust-lang/rust/pull/71274/
107 [77386]: https://github.com/rust-lang/rust/pull/77386/
108 [77153]: https://github.com/rust-lang/rust/pull/77153/
109 [77055]: https://github.com/rust-lang/rust/pull/77055/
110 [76275]: https://github.com/rust-lang/rust/pull/76275/
111 [76310]: https://github.com/rust-lang/rust/pull/76310/
112 [76420]: https://github.com/rust-lang/rust/pull/76420/
113 [76158]: https://github.com/rust-lang/rust/pull/76158/
114 [75857]: https://github.com/rust-lang/rust/pull/75857/
115 [75585]: https://github.com/rust-lang/rust/pull/75585/
116 [75740]: https://github.com/rust-lang/rust/pull/75740/
117 [75502]: https://github.com/rust-lang/rust/pull/75502/
118 [74880]: https://github.com/rust-lang/rust/pull/74880/
119 [74922]: https://github.com/rust-lang/rust/pull/74922/
120 [74430]: https://github.com/rust-lang/rust/pull/74430/
121 [74194]: https://github.com/rust-lang/rust/pull/74194/
122 [73461]: https://github.com/rust-lang/rust/pull/73461/
123 [73166]: https://github.com/rust-lang/rust/pull/73166/
124 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
125 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
126 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
127 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
128 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
129 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
130 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
131 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
132 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
133 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
134 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
135 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
136 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
137 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
138 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
141 Version 1.47.0 (2020-10-08)
142 ==========================
146 - [Closures will now warn when not used.][74869]
150 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
151 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
153 - [Upgraded to LLVM 11.][73526]
154 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
155 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
156 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
158 \* Refer to Rust's [platform support page][forge-platform-support] for more
159 information on Rust's tiered platform support.
163 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
164 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
165 those of length less than 33.][74060]
166 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
167 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
168 `PartialEq`, and `PartialOrd`.][73583]
173 - [`Range::is_empty`]
174 - [`RangeInclusive::is_empty`]
175 - [`Result::as_deref`]
176 - [`Result::as_deref_mut`]
178 - [`pointer::offset_from`]
182 The following previously stable APIs have now been made const.
184 - [The `new` method for all `NonZero` integers.][73858]
185 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
186 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
187 methods for all integers.][73858]
188 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
189 signed integers.][73858]
190 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
191 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
192 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
193 `is_ascii_control` methods for `char` and `u8`.][73858]
197 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
198 You can override this by setting the following in your `Cargo.toml`.
200 [profile.release.build-override]
203 - [`cargo-help` will now display man pages for commands rather just the
204 `--help` text.][cargo/8456]
205 - [`cargo-metadata` now emits a `test` field indicating if a target has
206 tests enabled.][cargo/8478]
207 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
208 - [`cargo-publish` will now use an alternative registry by default if it's the
209 only registry specified in `package.publish`.][cargo/8571]
213 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
214 type based search.][75366]
215 - [Added the Ayu theme to rustdoc.][71237]
219 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
220 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
221 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
222 help to preserve more span information.][73084] These changes may cause
223 compiliation errors if your macro was unhygenic or didn't correctly handle
225 - [Moved support for the CloudABI target to tier 3.][75568]
226 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
227 - [Added the `rustc-docs` component.][75560] This allows you to install
228 and read the documentation for the compiler internal APIs. (Currently only
229 available for `x86_64-unknown-linux-gnu`.)
234 - [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.
236 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
237 [75048]: https://github.com/rust-lang/rust/pull/75048/
238 [74163]: https://github.com/rust-lang/rust/pull/74163/
239 [71237]: https://github.com/rust-lang/rust/pull/71237/
240 [74869]: https://github.com/rust-lang/rust/pull/74869/
241 [73858]: https://github.com/rust-lang/rust/pull/73858/
242 [75716]: https://github.com/rust-lang/rust/pull/75716/
243 [75908]: https://github.com/rust-lang/rust/pull/75908/
244 [75516]: https://github.com/rust-lang/rust/pull/75516/
245 [75560]: https://github.com/rust-lang/rust/pull/75560/
246 [75568]: https://github.com/rust-lang/rust/pull/75568/
247 [75366]: https://github.com/rust-lang/rust/pull/75366/
248 [75204]: https://github.com/rust-lang/rust/pull/75204/
249 [74650]: https://github.com/rust-lang/rust/pull/74650/
250 [74419]: https://github.com/rust-lang/rust/pull/74419/
251 [73964]: https://github.com/rust-lang/rust/pull/73964/
252 [74021]: https://github.com/rust-lang/rust/pull/74021/
253 [74060]: https://github.com/rust-lang/rust/pull/74060/
254 [73893]: https://github.com/rust-lang/rust/pull/73893/
255 [73526]: https://github.com/rust-lang/rust/pull/73526/
256 [73583]: https://github.com/rust-lang/rust/pull/73583/
257 [73084]: https://github.com/rust-lang/rust/pull/73084/
258 [73197]: https://github.com/rust-lang/rust/pull/73197/
259 [72488]: https://github.com/rust-lang/rust/pull/72488/
260 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
261 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
262 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
263 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
264 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
265 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
266 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
267 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
268 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
269 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
270 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
271 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
272 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
273 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
274 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
277 Version 1.46.0 (2020-08-27)
278 ==========================
282 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
283 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
284 const functions.][73862]
285 - [The `#[track_caller]` attribute can now be added to functions to use the
286 function's caller's location information for panic messages.][72445]
287 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
288 `x.0.0` over `(x.0).0`.
289 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
290 You currently can't use `mem::transmute` in constant functions.
294 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
295 - [Enabled static "Position Independent Executables" by default
296 for `x86_64-unknown-linux-musl`.][70740]
300 - [`mem::forget` is now a `const fn`.][73887]
301 - [`String` now implements `From<char>`.][73466]
302 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
303 integer types.][73032]
304 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
305 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
306 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
307 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
308 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
309 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
314 - [`vec::Drain::as_slice`]
318 Added a number of new environment variables that are now available when
319 compiling your crate.
321 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
322 the specific binary being compiled and the name of the crate.
323 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
324 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
328 - [The target configuration option `abi_blacklist` has been renamed
329 to `unsupported_abis`.][74150] The old name will still continue to work.
330 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
331 This was previously accepted but will become a hard error in a future release.
332 - [Rustc will fail to compile if you have a struct with
333 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
335 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
336 ensure that spans have the correct information, and may cause breakage if you
337 were relying on receiving spans with dummy information.
338 - [The InnoSetup installer for Windows is no longer available.][72569] This was
339 a legacy installer that was replaced by a MSI installer a few years ago but
340 was still being built.
341 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
342 - [Rustc will no longer accept overlapping trait implementations that only
343 differ in how the lifetime was bound.][72493]
344 - [Rustc now correctly relates the lifetime of an existential associated
345 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
346 you to pass a shorter lifetime than expected.
347 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
348 The library will need to be installed for `rustc` to work, even though we
349 expect it to be already available on most systems.
350 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
352 - [Pretty printing of some tokens in procedural macros changed.][75453] The
353 exact output returned by rustc's pretty printing is an unstable
354 implementation detail: we recommend any macro relying on it to switch to a
355 more robust parsing system.
357 [75453]: https://github.com/rust-lang/rust/issues/75453/
358 [74820]: https://github.com/rust-lang/rust/issues/74820/
359 [74420]: https://github.com/rust-lang/rust/issues/74420/
360 [74109]: https://github.com/rust-lang/rust/pull/74109/
361 [74150]: https://github.com/rust-lang/rust/pull/74150/
362 [73862]: https://github.com/rust-lang/rust/pull/73862/
363 [73887]: https://github.com/rust-lang/rust/pull/73887/
364 [73466]: https://github.com/rust-lang/rust/pull/73466/
365 [73516]: https://github.com/rust-lang/rust/pull/73516/
366 [73293]: https://github.com/rust-lang/rust/pull/73293/
367 [73007]: https://github.com/rust-lang/rust/pull/73007/
368 [73032]: https://github.com/rust-lang/rust/pull/73032/
369 [72920]: https://github.com/rust-lang/rust/pull/72920/
370 [72569]: https://github.com/rust-lang/rust/pull/72569/
371 [72583]: https://github.com/rust-lang/rust/pull/72583/
372 [72584]: https://github.com/rust-lang/rust/pull/72584/
373 [72717]: https://github.com/rust-lang/rust/pull/72717/
374 [72437]: https://github.com/rust-lang/rust/pull/72437/
375 [72445]: https://github.com/rust-lang/rust/pull/72445/
376 [72486]: https://github.com/rust-lang/rust/pull/72486/
377 [72493]: https://github.com/rust-lang/rust/pull/72493/
378 [72331]: https://github.com/rust-lang/rust/pull/72331/
379 [71896]: https://github.com/rust-lang/rust/pull/71896/
380 [71660]: https://github.com/rust-lang/rust/pull/71660/
381 [71322]: https://github.com/rust-lang/rust/pull/71322/
382 [70740]: https://github.com/rust-lang/rust/pull/70740/
383 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
384 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
385 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
386 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
387 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
390 Version 1.45.2 (2020-08-03)
391 ==========================
393 * [Fix bindings in tuple struct patterns][74954]
394 * [Fix track_caller integration with trait objects][74784]
396 [74954]: https://github.com/rust-lang/rust/issues/74954
397 [74784]: https://github.com/rust-lang/rust/issues/74784
400 Version 1.45.1 (2020-07-30)
401 ==========================
403 * [Fix const propagation with references.][73613]
404 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
405 * [Avoid spurious implicit region bound.][74509]
406 * [Install clippy on x.py install][74457]
408 [73613]: https://github.com/rust-lang/rust/pull/73613
409 [73078]: https://github.com/rust-lang/rust/issues/73078
410 [74509]: https://github.com/rust-lang/rust/pull/74509
411 [74457]: https://github.com/rust-lang/rust/pull/74457
414 Version 1.45.0 (2020-07-16)
415 ==========================
419 - [Out of range float to int conversions using `as` has been defined as a saturating
420 conversion.][71269] This was previously undefined behaviour, but you can use the
421 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
422 may be desirable in rare performance sensitive situations.
423 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
425 - [Function like procedural macros can now be used in expression, pattern, and statement
426 positions.][68717] This means you can now use a function-like procedural macro
427 anywhere you can use a declarative (`macro_rules!`) macro.
431 - [You can now override individual target features through the `target-feature`
432 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
433 equivalent to `-C target-feature=+avx2,+fma`.
434 - [Added the `force-unwind-tables` flag.][69984] This option allows
435 rustc to always generate unwind tables regardless of panic strategy.
436 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
437 to include LLVM bitcode into generated `rlib`s (this is on by default).
438 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
439 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
440 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
441 - [Upgraded to LLVM 10.][67759]
443 \* Refer to Rust's [platform support page][forge-platform-support] for more
444 information on Rust's tiered platform support.
449 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
451 - [`proc_macro::TokenStream` now implements `Default`.][72234]
452 - [You can now use `char` with
453 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
454 a range of codepoints.][72413] E.g.
455 you can now write the following;
457 for ch in 'a'..='z' {
461 // Prints "abcdefghijklmnopqrstuvwxyz"
463 - [`OsString` now implements `FromStr`.][71662]
464 - [The `saturating_neg` method has been added to all signed integer primitive
465 types, and the `saturating_abs` method has been added for all integer
466 primitive types.][71886]
467 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
468 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
470 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
471 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
472 integer types.][69813]
473 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
474 integer types.][72324]
475 - [The `fetch_update` method has been added to all atomic integer types.][71843]
480 - [`BTreeMap::remove_entry`]
482 - [`rc::Weak::as_ptr`]
483 - [`rc::Weak::from_raw`]
484 - [`rc::Weak::into_raw`]
485 - [`str::strip_prefix`]
486 - [`str::strip_suffix`]
487 - [`sync::Weak::as_ptr`]
488 - [`sync::Weak::from_raw`]
489 - [`sync::Weak::into_raw`]
490 - [`char::UNICODE_VERSION`]
491 - [`Span::resolved_at`]
492 - [`Span::located_at`]
493 - [`Span::mixed_site`]
494 - [`unix::process::CommandExt::arg0`]
499 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
504 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
505 `~~outdated information~~` becomes "~~outdated information~~".
506 - [Added an emoji to Rustdoc's deprecated API message.][72014]
510 - [Trying to self initialize a static value (that is creating a value using
511 itself) is unsound and now causes a compile error.][71140]
512 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
513 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
514 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
515 previously undocumented and not intended for public use. Rustdoc still provides
516 a non-zero exit code on errors.
517 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
518 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
519 flags while cargo is adding `embed-bitcode` itself. The recommended way to
520 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
521 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
525 - [Make clippy a git subtree instead of a git submodule][70655]
526 - [Unify the undo log of all snapshot types][69464]
528 [71848]: https://github.com/rust-lang/rust/issues/71848/
529 [73420]: https://github.com/rust-lang/rust/issues/73420/
530 [72324]: https://github.com/rust-lang/rust/pull/72324/
531 [71843]: https://github.com/rust-lang/rust/pull/71843/
532 [71886]: https://github.com/rust-lang/rust/pull/71886/
533 [72234]: https://github.com/rust-lang/rust/pull/72234/
534 [72239]: https://github.com/rust-lang/rust/pull/72239/
535 [72397]: https://github.com/rust-lang/rust/pull/72397/
536 [72413]: https://github.com/rust-lang/rust/pull/72413/
537 [72014]: https://github.com/rust-lang/rust/pull/72014/
538 [72062]: https://github.com/rust-lang/rust/pull/72062/
539 [72094]: https://github.com/rust-lang/rust/pull/72094/
540 [72133]: https://github.com/rust-lang/rust/pull/72133/
541 [67759]: https://github.com/rust-lang/rust/pull/67759/
542 [71900]: https://github.com/rust-lang/rust/pull/71900/
543 [71928]: https://github.com/rust-lang/rust/pull/71928/
544 [71662]: https://github.com/rust-lang/rust/pull/71662/
545 [71716]: https://github.com/rust-lang/rust/pull/71716/
546 [71447]: https://github.com/rust-lang/rust/pull/71447/
547 [71269]: https://github.com/rust-lang/rust/pull/71269/
548 [71095]: https://github.com/rust-lang/rust/pull/71095/
549 [71140]: https://github.com/rust-lang/rust/pull/71140/
550 [70655]: https://github.com/rust-lang/rust/pull/70655/
551 [70705]: https://github.com/rust-lang/rust/pull/70705/
552 [69984]: https://github.com/rust-lang/rust/pull/69984/
553 [69813]: https://github.com/rust-lang/rust/pull/69813/
554 [69464]: https://github.com/rust-lang/rust/pull/69464/
555 [68717]: https://github.com/rust-lang/rust/pull/68717/
556 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
557 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
558 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
559 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
560 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
561 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
562 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
563 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
564 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
565 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
566 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
567 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
568 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
569 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
570 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
571 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
572 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
575 Version 1.44.1 (2020-06-18)
576 ===========================
578 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
579 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
580 * [Fix crashes when finding backtrace on macOS.][71397]
581 * [Clippy applies lint levels into different files.][clippy/5356]
583 [71397]: https://github.com/rust-lang/rust/issues/71397
584 [73078]: https://github.com/rust-lang/rust/issues/73078
585 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
586 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
589 Version 1.44.0 (2020-06-04)
590 ==========================
594 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
595 - [Added the `unused_braces` lint.][70081]
597 **Syntax-only changes**
599 - [Expansion-driven outline module parsing][69838]
604 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
609 These are still rejected semantically, so you will likely receive an error but
610 these changes can be seen and parsed by macros and conditional compilation.
614 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
615 Additionally when in incremental mode rustc defaults to 256 codegen units.
616 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
617 a panic is thrown.][67502]
618 - [Added tier 3\* support for the `aarch64-unknown-none` and
619 `aarch64-unknown-none-softfloat` targets.][68334]
620 - [Added tier 3 support for `arm64-apple-tvos` and
621 `x86_64-apple-tvos` targets.][68191]
626 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
627 `vec![]` to be able to be used in `const` contexts.
628 - [`convert::Infallible` now implements `Hash`.][70281]
629 - [`OsString` now implements `DerefMut` and `IndexMut` returning
630 a `&mut OsStr`.][70048]
631 - [Unicode 13 is now supported.][69929]
632 - [`String` now implements `From<&mut str>`.][69661]
633 - [`IoSlice` now implements `Copy`.][69403]
634 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
635 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
636 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
637 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
638 integer types.][69373]
642 - [`PathBuf::with_capacity`]
643 - [`PathBuf::capacity`]
645 - [`PathBuf::reserve`]
646 - [`PathBuf::reserve_exact`]
647 - [`PathBuf::shrink_to_fit`]
648 - [`f32::to_int_unchecked`]
649 - [`f64::to_int_unchecked`]
650 - [`Layout::align_to`]
651 - [`Layout::pad_to_align`]
657 - [Added the `cargo tree` command which will print a tree graph of
658 your dependencies.][cargo/8062] E.g.
660 mdbook v0.3.2 (/Users/src/rust/mdbook)
662 │ ├── html5ever v0.24.0
664 │ │ │ └── cfg-if v0.1.9
666 │ │ └── markup5ever v0.9.0
667 │ │ ├── log v0.4.8 (*)
669 │ │ │ └── phf_shared v0.7.24
670 │ │ │ ├── siphasher v0.2.3
671 │ │ │ └── unicase v1.4.2
672 │ │ │ [build-dependencies]
673 │ │ │ └── version_check v0.1.5
676 You can also display dependencies on multiple versions of the same crate with
677 `cargo tree -d` (short for `cargo tree --duplicates`).
681 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
682 the version in the sidebar.][69494]
686 - [Rustc now correctly generates static libraries on Windows GNU targets with
687 the `.a` extension, rather than the previous `.lib`.][70937]
688 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
689 - [The `file_name` property in JSON output of macro errors now points the actual
690 source file rather than the previous format of `<NAME macros>`.][70969]
691 **Note:** this may not point to a file that actually exists on the user's system.
692 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
693 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
694 not allow zero initialization such as `NonZeroU8`.][66059] This was
695 previously a warning.
696 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
697 operator has been defined as a saturating operation.][71269] This was previously
698 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
699 continue using the current behaviour, which may be desirable in rare performance
700 sensitive situations.
704 These changes provide no direct user facing benefits, but represent significant
705 improvements to the internals and overall performance of rustc and
708 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
709 - [Replace big JS dict with JSON parsing.][71250]
711 [69373]: https://github.com/rust-lang/rust/pull/69373/
712 [66059]: https://github.com/rust-lang/rust/pull/66059/
713 [68191]: https://github.com/rust-lang/rust/pull/68191/
714 [68899]: https://github.com/rust-lang/rust/pull/68899/
715 [71147]: https://github.com/rust-lang/rust/pull/71147/
716 [71250]: https://github.com/rust-lang/rust/pull/71250/
717 [70937]: https://github.com/rust-lang/rust/pull/70937/
718 [70969]: https://github.com/rust-lang/rust/pull/70969/
719 [70632]: https://github.com/rust-lang/rust/pull/70632/
720 [70281]: https://github.com/rust-lang/rust/pull/70281/
721 [70345]: https://github.com/rust-lang/rust/pull/70345/
722 [70048]: https://github.com/rust-lang/rust/pull/70048/
723 [70081]: https://github.com/rust-lang/rust/pull/70081/
724 [70156]: https://github.com/rust-lang/rust/pull/70156/
725 [71269]: https://github.com/rust-lang/rust/pull/71269/
726 [69838]: https://github.com/rust-lang/rust/pull/69838/
727 [69929]: https://github.com/rust-lang/rust/pull/69929/
728 [69661]: https://github.com/rust-lang/rust/pull/69661/
729 [69778]: https://github.com/rust-lang/rust/pull/69778/
730 [69494]: https://github.com/rust-lang/rust/pull/69494/
731 [69403]: https://github.com/rust-lang/rust/pull/69403/
732 [69033]: https://github.com/rust-lang/rust/pull/69033/
733 [68692]: https://github.com/rust-lang/rust/pull/68692/
734 [68334]: https://github.com/rust-lang/rust/pull/68334/
735 [67502]: https://github.com/rust-lang/rust/pull/67502/
736 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
737 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
738 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
739 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
740 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
741 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
742 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
743 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
744 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
745 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
746 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
747 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
748 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
751 Version 1.43.1 (2020-05-07)
752 ===========================
754 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
755 * [Fixed the stabilization of AVX-512 features.][71473]
756 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
758 [71430]: https://github.com/rust-lang/rust/pull/71430
759 [71473]: https://github.com/rust-lang/rust/issues/71473
760 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
763 Version 1.43.0 (2020-04-23)
764 ==========================
768 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
769 the type inferred correctly.][68129]
770 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
772 **Syntax only changes**
773 - [Allow `type Foo: Ord` syntactically.][69361]
774 - [Fuse associated and extern items up to defaultness.][69194]
775 - [Syntactically allow `self` in all `fn` contexts.][68764]
776 - [Merge `fn` syntax + cleanup item parsing.][68728]
777 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
778 For example, you may now write:
780 macro_rules! mac_trait {
790 These are still rejected *semantically*, so you will likely receive an error but
791 these changes can be seen and parsed by macros and
792 conditional compilation.
797 - [You can now pass multiple lint flags to rustc to override the previous
798 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
799 everything in the `unused` lint group except `unused-variables` which
800 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
801 everything in the `unused` lint group **including** `unused-variables` since
802 the allow flag is specified before the deny flag (and therefore overridden).
803 - [rustc will now prefer your system MinGW libraries over its bundled libraries
804 if they are available on `windows-gnu`.][67429]
805 - [rustc now buffers errors/warnings printed in JSON.][69227]
809 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
810 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
811 respectively.][69538] **Note** These conversions are only available when `N`
813 - [You can now use associated constants on floats and integers directly, rather
814 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
815 `f32::NAN` with no imports.
816 - [`u8::is_ascii` is now `const`.][68984]
817 - [`String` now implements `AsMut<str>`.][68742]
818 - [Added the `primitive` module to `std` and `core`.][67637] This module
819 reexports Rust's primitive types. This is mainly useful in macros
820 where you want avoid these types being shadowed.
821 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
822 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
826 - [`Once::is_completed`]
831 - [`iter::once_with`]
835 - [You can now set config `[profile]`s in your `.cargo/config`, or through
836 your environment.][cargo/7823]
837 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
838 executable path when running integration tests or benchmarks.][cargo/7697]
839 `<name>` is the name of your binary as-is e.g. If you wanted the executable
840 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
844 - [Certain checks in the `const_err` lint were deemed unrelated to const
845 evaluation][69185], and have been moved to the `unconditional_panic` and
846 `arithmetic_overflow` lints.
851 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
852 has been a warning since 1.36.0.
853 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
854 led to some instances being accepted, and now correctly emits a hard error.
856 [69340]: https://github.com/rust-lang/rust/pull/69340
860 These changes provide no direct user facing benefits, but represent significant
861 improvements to the internals and overall performance of `rustc` and
864 - [All components are now built with `opt-level=3` instead of `2`.][67878]
865 - [Improved how rustc generates drop code.][67332]
866 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
867 - [traits: preallocate 2 Vecs of known initial size][69022]
868 - [Avoid exponential behaviour when relating types][68772]
869 - [Skip `Drop` terminators for enum variants without drop glue][68943]
870 - [Improve performance of coherence checks][68966]
871 - [Deduplicate types in the generator witness][68672]
872 - [Invert control in struct_lint_level.][68725]
874 [67332]: https://github.com/rust-lang/rust/pull/67332/
875 [67429]: https://github.com/rust-lang/rust/pull/67429/
876 [67637]: https://github.com/rust-lang/rust/pull/67637/
877 [67642]: https://github.com/rust-lang/rust/pull/67642/
878 [67878]: https://github.com/rust-lang/rust/pull/67878/
879 [67885]: https://github.com/rust-lang/rust/pull/67885/
880 [68129]: https://github.com/rust-lang/rust/pull/68129/
881 [68672]: https://github.com/rust-lang/rust/pull/68672/
882 [68725]: https://github.com/rust-lang/rust/pull/68725/
883 [68728]: https://github.com/rust-lang/rust/pull/68728/
884 [68738]: https://github.com/rust-lang/rust/pull/68738/
885 [68742]: https://github.com/rust-lang/rust/pull/68742/
886 [68764]: https://github.com/rust-lang/rust/pull/68764/
887 [68772]: https://github.com/rust-lang/rust/pull/68772/
888 [68943]: https://github.com/rust-lang/rust/pull/68943/
889 [68952]: https://github.com/rust-lang/rust/pull/68952/
890 [68966]: https://github.com/rust-lang/rust/pull/68966/
891 [68984]: https://github.com/rust-lang/rust/pull/68984/
892 [69022]: https://github.com/rust-lang/rust/pull/69022/
893 [69185]: https://github.com/rust-lang/rust/pull/69185/
894 [69194]: https://github.com/rust-lang/rust/pull/69194/
895 [69201]: https://github.com/rust-lang/rust/pull/69201/
896 [69227]: https://github.com/rust-lang/rust/pull/69227/
897 [69548]: https://github.com/rust-lang/rust/pull/69548/
898 [69256]: https://github.com/rust-lang/rust/pull/69256/
899 [69361]: https://github.com/rust-lang/rust/pull/69361/
900 [69366]: https://github.com/rust-lang/rust/pull/69366/
901 [69538]: https://github.com/rust-lang/rust/pull/69538/
902 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
903 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
904 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
905 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
906 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
907 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
908 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
909 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
912 Version 1.42.0 (2020-03-12)
913 ==========================
917 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
919 fn foo(words: &[&str]) {
921 ["Hello", "World", "!", ..] => println!("Hello World!"),
922 ["Foo", "Bar", ..] => println!("Baz"),
923 rest => println!("{:?}", rest),
927 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
928 that you can create an enum that has the exact layout and ABI of the type
930 - [There are some *syntax-only* changes:][67131]
931 - `default` is syntactically allowed before items in `trait` definitions.
932 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
933 leave out their bodies in favor of `;`.
934 - Bounds on associated types in `impl`s are now syntactically allowed
935 (e.g. `type Foo: Ord;`).
936 - `...` (the C-variadic type) may occur syntactically directly as the type of
937 any function parameter.
939 These are still rejected *semantically*, so you will likely receive an error
940 but these changes can be seen and parsed by procedural macros and
941 conditional compilation.
945 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
946 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
947 - [`Option::{expect,unwrap}` and
948 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
949 pointing to the location where they were called, rather than
950 `core`'s internals. ][67887]
952 \* Refer to Rust's [platform support page][forge-platform-support] for more
953 information on Rust's tiered platform support.
957 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
958 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
959 to implement `Sized`.][67935]
960 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
961 - [`Layout::new` is now `const`.][66254]
962 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
967 - [`CondVar::wait_while`]
968 - [`CondVar::wait_timeout_while`]
970 - [`DebugMap::value`]
971 - [`ManuallyDrop::take`]
973 - [`ptr::slice_from_raw_parts_mut`]
974 - [`ptr::slice_from_raw_parts`]
978 - [You no longer need to include `extern crate proc_macro;` to be able to
979 `use proc_macro;` in the `2018` edition.][cargo/7700]
983 - [`Error::description` has been deprecated, and its use will now produce a
984 warning.][66919] It's recommended to use `Display`/`to_string` instead.
986 [68253]: https://github.com/rust-lang/rust/pull/68253/
987 [68348]: https://github.com/rust-lang/rust/pull/68348/
988 [67935]: https://github.com/rust-lang/rust/pull/67935/
989 [68339]: https://github.com/rust-lang/rust/pull/68339/
990 [68122]: https://github.com/rust-lang/rust/pull/68122/
991 [67712]: https://github.com/rust-lang/rust/pull/67712/
992 [67887]: https://github.com/rust-lang/rust/pull/67887/
993 [67131]: https://github.com/rust-lang/rust/pull/67131/
994 [67233]: https://github.com/rust-lang/rust/pull/67233/
995 [66899]: https://github.com/rust-lang/rust/pull/66899/
996 [66919]: https://github.com/rust-lang/rust/pull/66919/
997 [66254]: https://github.com/rust-lang/rust/pull/66254/
998 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
999 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
1000 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
1001 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1002 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1003 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1004 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1005 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1006 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1009 Version 1.41.1 (2020-02-27)
1010 ===========================
1012 * [Always check types of static items][69145]
1013 * [Always check lifetime bounds of `Copy` impls][69145]
1014 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1016 [69225]: https://github.com/rust-lang/rust/issues/69225
1017 [69145]: https://github.com/rust-lang/rust/pull/69145
1020 Version 1.41.0 (2020-01-30)
1021 ===========================
1026 - [You can now pass type parameters to foreign items when implementing
1027 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1028 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1029 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1030 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1031 - [You can now use any valid identifier in a `format_args` macro.][66847]
1032 Previously identifiers starting with an underscore were not allowed.
1033 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1034 enum variants.][66183] These are still rejected semantically, but
1035 can be seen and parsed by procedural macros and conditional compilation.
1040 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1041 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1042 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1043 - [You can now pass an arguments file passing the `@path` syntax
1044 to rustc.][66172] Note that the format differs somewhat from what is
1045 found in other tooling; please see [the documentation][argfile-docs] for
1047 - [You can now provide `--extern` flag without a path, indicating that it is
1048 available from the search path or specified with an `-L` flag.][64882]
1050 \* Refer to Rust's [platform support page][forge-platform-support] for more
1051 information on Rust's tiered platform support.
1053 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1058 - [The `core::panic` module is now stable.][66771] It was already stable
1060 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1061 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1062 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1067 - [`Result::map_or`]
1068 - [`Result::map_or_else`]
1069 - [`std::rc::Weak::weak_count`]
1070 - [`std::rc::Weak::strong_count`]
1071 - [`std::sync::Weak::weak_count`]
1072 - [`std::sync::Weak::strong_count`]
1077 - [Cargo will now document all the private items for binary crates
1078 by default.][cargo/7593]
1079 - [`cargo-install` will now reinstall the package if it detects that it is out
1080 of date.][cargo/7560]
1081 - [Cargo.lock now uses a more git friendly format that should help to reduce
1082 merge conflicts.][cargo/7579]
1083 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1084 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1085 optimisation level to `2` for debug builds. You can also use
1086 `[profile.<profile>.build-override]` to override build scripts and
1092 - [You can now specify `edition` in documentation code blocks to compile the block
1093 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1094 should be compiled the 2018 edition of Rust.
1095 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1096 current theme with `--check-theme`.][54733]
1097 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1102 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1103 Apple targets.][apple-32bit-drop] This means that the source code is still
1104 available to build, but the targets are no longer being tested and release
1105 binaries for those platforms will no longer be distributed by the Rust project.
1106 Please refer to the linked blog post for more information.
1108 [54733]: https://github.com/rust-lang/rust/pull/54733/
1109 [61351]: https://github.com/rust-lang/rust/pull/61351/
1110 [67255]: https://github.com/rust-lang/rust/pull/67255/
1111 [66661]: https://github.com/rust-lang/rust/pull/66661/
1112 [66771]: https://github.com/rust-lang/rust/pull/66771/
1113 [66847]: https://github.com/rust-lang/rust/pull/66847/
1114 [66238]: https://github.com/rust-lang/rust/pull/66238/
1115 [66277]: https://github.com/rust-lang/rust/pull/66277/
1116 [66325]: https://github.com/rust-lang/rust/pull/66325/
1117 [66172]: https://github.com/rust-lang/rust/pull/66172/
1118 [66183]: https://github.com/rust-lang/rust/pull/66183/
1119 [65879]: https://github.com/rust-lang/rust/pull/65879/
1120 [65013]: https://github.com/rust-lang/rust/pull/65013/
1121 [64882]: https://github.com/rust-lang/rust/pull/64882/
1122 [64325]: https://github.com/rust-lang/rust/pull/64325/
1123 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1124 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1125 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1126 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1127 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1128 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1129 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1130 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1131 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1132 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1133 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1135 Version 1.40.0 (2019-12-19)
1136 ===========================
1140 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1141 `const` contexts.][65188] e.g.
1144 pub struct Point(i32, i32);
1146 const ORIGIN: Point = {
1147 let constructor = Point;
1153 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1154 indicate that there may be variants or fields added in the future.][64639]
1155 For example this requires adding a wild-card branch (`_ => {}`) to any match
1156 statements on a non-exhaustive `enum`. [(RFC 2008)]
1157 - [You can now use function-like procedural macros in `extern` blocks and in
1158 type positions.][63931] e.g. `type Generated = macro!();`
1159 - [Function-like and attribute procedural macros can now emit
1160 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1161 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1162 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1163 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1167 - [Added tier 3 support\* for the
1168 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1169 - [Added tier 3 support for the
1170 `aarch64-unknown-none-softfloat` target.][64589]
1171 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1172 `mips64el-unknown-linux-muslabi64` targets.][65843]
1174 \* Refer to Rust's [platform support page][forge-platform-support] for more
1175 information on Rust's tiered platform support.
1179 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1183 - [`BTreeMap::get_key_value`]
1184 - [`HashMap::get_key_value`]
1185 - [`Option::as_deref_mut`]
1186 - [`Option::as_deref`]
1187 - [`Option::flatten`]
1188 - [`UdpSocket::peer_addr`]
1189 - [`f32::to_be_bytes`]
1190 - [`f32::to_le_bytes`]
1191 - [`f32::to_ne_bytes`]
1192 - [`f64::to_be_bytes`]
1193 - [`f64::to_le_bytes`]
1194 - [`f64::to_ne_bytes`]
1195 - [`f32::from_be_bytes`]
1196 - [`f32::from_le_bytes`]
1197 - [`f32::from_ne_bytes`]
1198 - [`f64::from_be_bytes`]
1199 - [`f64::from_le_bytes`]
1200 - [`f64::from_ne_bytes`]
1207 - [Cargo will now always display warnings, rather than only on
1208 fresh builds.][cargo/7450]
1209 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1210 now produce an error.][cargo/7507] Previously these flags were ignored.
1211 - [You can now publish `dev-dependencies` without including
1212 a `version`.][cargo/7333]
1216 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1217 when running documentation tests with `rustdoc`.][63803]
1221 - [As previously announced, any previous NLL warnings in the 2015 edition are
1222 now hard errors.][64221]
1223 - [The `include!` macro will now warn if it failed to include the
1224 entire file.][64284] The `include!` macro unintentionally only includes the
1225 first _expression_ in a file, and this can be unintuitive. This will become
1226 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1227 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1228 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1229 or `extern` blocks now correctly emits a hard error.
1231 [65294]: https://github.com/rust-lang/rust/pull/65294/
1232 [66103]: https://github.com/rust-lang/rust/pull/66103/
1233 [65843]: https://github.com/rust-lang/rust/pull/65843/
1234 [65188]: https://github.com/rust-lang/rust/pull/65188/
1235 [65092]: https://github.com/rust-lang/rust/pull/65092/
1236 [64589]: https://github.com/rust-lang/rust/pull/64589/
1237 [64639]: https://github.com/rust-lang/rust/pull/64639/
1238 [64221]: https://github.com/rust-lang/rust/pull/64221/
1239 [64284]: https://github.com/rust-lang/rust/pull/64284/
1240 [63931]: https://github.com/rust-lang/rust/pull/63931/
1241 [64035]: https://github.com/rust-lang/rust/pull/64035/
1242 [63674]: https://github.com/rust-lang/rust/pull/63674/
1243 [63803]: https://github.com/rust-lang/rust/pull/63803/
1244 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1245 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1246 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1247 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1248 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1249 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1250 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1251 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1252 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1253 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1254 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1255 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1256 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1257 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1258 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1259 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1260 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1261 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1262 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1263 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1264 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1265 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1266 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1267 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1268 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1269 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1272 Version 1.39.0 (2019-11-07)
1273 ===========================
1277 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1278 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1279 - [You can now use certain attributes on function, closure, and function pointer
1280 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1281 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1282 attributes applied to items. e.g.
1285 #[cfg(windows)] slice: &[u16],
1286 #[cfg(not(windows))] slice: &[u8],
1291 - [You can now take shared references to bind-by-move patterns in the `if` guards
1292 of `match` arms.][63118] e.g.
1295 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1299 // ---- `nums` is bound by move.
1300 if nums.iter().sum::<u8>() == 10
1301 // ^------ `.iter()` implicitly takes a reference to `nums`.
1304 // ----------- Legal as `nums` was bound by move and so we have ownership.
1306 _ => unreachable!(),
1315 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1316 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1317 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1318 **Note** Cargo currently doesn't use this feature. Refer to
1319 [cargo#7315][cargo/7315] to track this feature's progress.
1320 - [You can now pass `--show-output` argument to test binaries to print the
1321 output of successful tests.][62600]
1324 \* Refer to Rust's [platform support page][forge-platform-support] for more
1325 information on Rust's tiered platform support.
1329 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1330 - [`LinkedList::new` is now a `const` function.][63684]
1331 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1332 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1333 now `const`.][63786]
1337 - [`Pin::into_inner`]
1338 - [`Instant::checked_duration_since`]
1339 - [`Instant::saturating_duration_since`]
1343 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1344 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1345 `--all` is now deprecated.
1349 - [You can now pass `-Clinker` to rustdoc to control the linker used
1350 for compiling doctests.][63834]
1354 - [Code that was previously accepted by the old borrow checker, but rejected by
1355 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1356 previously a warning, and will also become a hard error in the Rust 2015
1357 edition in the 1.40.0 release.
1358 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1359 run tests.][63827] This should improve performance when running a large
1361 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1362 recommended to use the `?` operator instead.
1363 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1366 [62600]: https://github.com/rust-lang/rust/pull/62600/
1367 [62672]: https://github.com/rust-lang/rust/pull/62672/
1368 [63118]: https://github.com/rust-lang/rust/pull/63118/
1369 [63209]: https://github.com/rust-lang/rust/pull/63209/
1370 [63402]: https://github.com/rust-lang/rust/pull/63402/
1371 [63565]: https://github.com/rust-lang/rust/pull/63565/
1372 [63595]: https://github.com/rust-lang/rust/pull/63595/
1373 [63684]: https://github.com/rust-lang/rust/pull/63684/
1374 [63698]: https://github.com/rust-lang/rust/pull/63698/
1375 [63770]: https://github.com/rust-lang/rust/pull/63770/
1376 [63786]: https://github.com/rust-lang/rust/pull/63786/
1377 [63827]: https://github.com/rust-lang/rust/pull/63827/
1378 [63834]: https://github.com/rust-lang/rust/pull/63834/
1379 [63927]: https://github.com/rust-lang/rust/pull/63927/
1380 [63933]: https://github.com/rust-lang/rust/pull/63933/
1381 [63934]: https://github.com/rust-lang/rust/pull/63934/
1382 [63938]: https://github.com/rust-lang/rust/pull/63938/
1383 [63940]: https://github.com/rust-lang/rust/pull/63940/
1384 [63941]: https://github.com/rust-lang/rust/pull/63941/
1385 [63945]: https://github.com/rust-lang/rust/pull/63945/
1386 [64010]: https://github.com/rust-lang/rust/pull/64010/
1387 [64028]: https://github.com/rust-lang/rust/pull/64028/
1388 [64334]: https://github.com/rust-lang/rust/pull/64334/
1389 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1390 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1391 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1392 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1393 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1394 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1396 Version 1.38.0 (2019-09-26)
1397 ==========================
1401 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1402 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1406 - [Added pipelined compilation support to `rustc`.][62766] This will
1407 improve compilation times in some cases. For further information please refer
1408 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1409 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1410 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1411 `x86_64-uwp-windows-msvc` targets.][60260]
1412 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1413 `armv7-unknown-linux-musleabi` targets.][63107]
1414 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1415 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1416 - [Upgraded to LLVM 9.][62592]
1418 \* Refer to Rust's [platform support page][forge-platform-support] for more
1419 information on Rust's tiered platform support.
1423 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1424 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1425 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1426 is available at `std::clone::Clone`). This also makes all built-in macros
1427 available in `std`/`core` root. e.g. `std::include_bytes!`.
1428 - [`str::Chars` now implements `Debug`.][63000]
1429 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1430 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1431 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1432 - [Added euclidean remainder and division operations (`div_euclid`,
1433 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1434 `overflowing`, and `wrapping` versions are available for all
1436 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1437 `PartialEq`.][61491]
1438 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1442 - [`<*const T>::cast`]
1443 - [`<*mut T>::cast`]
1444 - [`Duration::as_secs_f32`]
1445 - [`Duration::as_secs_f64`]
1446 - [`Duration::div_f32`]
1447 - [`Duration::div_f64`]
1448 - [`Duration::from_secs_f32`]
1449 - [`Duration::from_secs_f64`]
1450 - [`Duration::mul_f32`]
1451 - [`Duration::mul_f64`]
1452 - [`any::type_name`]
1456 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1457 - [You can now pass the `--features` option multiple times to enable
1458 multiple features.][cargo/7084]
1462 - [`rustc` will now warn about some incorrect uses of
1463 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1467 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1469 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1470 issues][62896] with certain crates such as libc.
1472 [60260]: https://github.com/rust-lang/rust/pull/60260/
1473 [61457]: https://github.com/rust-lang/rust/pull/61457/
1474 [61491]: https://github.com/rust-lang/rust/pull/61491/
1475 [61884]: https://github.com/rust-lang/rust/pull/61884/
1476 [61953]: https://github.com/rust-lang/rust/pull/61953/
1477 [62042]: https://github.com/rust-lang/rust/pull/62042/
1478 [62528]: https://github.com/rust-lang/rust/pull/62528/
1479 [62583]: https://github.com/rust-lang/rust/pull/62583/
1480 [62735]: https://github.com/rust-lang/rust/pull/62735/
1481 [62766]: https://github.com/rust-lang/rust/pull/62766/
1482 [62784]: https://github.com/rust-lang/rust/pull/62784/
1483 [62592]: https://github.com/rust-lang/rust/pull/62592/
1484 [62785]: https://github.com/rust-lang/rust/issues/62785/
1485 [62814]: https://github.com/rust-lang/rust/pull/62814/
1486 [62896]: https://github.com/rust-lang/rust/issues/62896/
1487 [63000]: https://github.com/rust-lang/rust/pull/63000/
1488 [63056]: https://github.com/rust-lang/rust/pull/63056/
1489 [63107]: https://github.com/rust-lang/rust/pull/63107/
1490 [63346]: https://github.com/rust-lang/rust/pull/63346/
1491 [63421]: https://github.com/rust-lang/rust/pull/63421/
1492 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1493 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1494 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1495 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1496 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1497 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1498 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1499 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1500 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1501 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1502 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1503 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1504 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1505 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1506 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1508 Version 1.37.0 (2019-08-15)
1509 ==========================
1513 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1514 [`Box`][62228], or an [array][62235] and unused.
1515 - [You can now use the `cfg` and `cfg_attr` attributes on
1516 generic parameters.][61547]
1517 - [You can now use enum variants through type alias.][61682] e.g. You can
1518 write the following:
1520 type MyOption = Option<u8>;
1522 fn increment_or_zero(x: MyOption) -> u8 {
1524 MyOption::Some(y) => y + 1,
1525 MyOption::None => 0,
1529 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1530 `const _: u32 = 5;`.
1531 - [You can now use `#[repr(align(X)]` on enums.][61229]
1532 - [The `?` Kleene macro operator is now available in the
1533 2015 edition.][60932]
1537 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1538 and `-C profile-use` flags.][61268] For more information on how to use profile
1539 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1540 - [The `rust-lldb` wrapper script should now work again.][61827]
1544 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1548 - [`BufReader::buffer`]
1549 - [`BufWriter::buffer`]
1550 - [`Cell::from_mut`]
1551 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1552 - [`DoubleEndedIterator::nth_back`]
1554 - [`Wrapping::reverse_bits`]
1555 - [`i128::reverse_bits`]
1556 - [`i16::reverse_bits`]
1557 - [`i32::reverse_bits`]
1558 - [`i64::reverse_bits`]
1559 - [`i8::reverse_bits`]
1560 - [`isize::reverse_bits`]
1561 - [`slice::copy_within`]
1562 - [`u128::reverse_bits`]
1563 - [`u16::reverse_bits`]
1564 - [`u32::reverse_bits`]
1565 - [`u64::reverse_bits`]
1566 - [`u8::reverse_bits`]
1567 - [`usize::reverse_bits`]
1571 - [`Cargo.lock` files are now included by default when publishing executable crates
1572 with executables.][cargo/7026]
1573 - [You can now specify `default-run="foo"` in `[package]` to specify the
1574 default executable to use for `cargo run`.][cargo/7056]
1581 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1582 Please transition your code to using the `..=` syntax for inclusive
1584 - [Using a trait object without the `dyn` will now warn by default.][61203]
1585 Please transition your code to use `dyn Trait` for trait objects instead.
1587 [62228]: https://github.com/rust-lang/rust/pull/62228/
1588 [62235]: https://github.com/rust-lang/rust/pull/62235/
1589 [61802]: https://github.com/rust-lang/rust/pull/61802/
1590 [61827]: https://github.com/rust-lang/rust/pull/61827/
1591 [61547]: https://github.com/rust-lang/rust/pull/61547/
1592 [61682]: https://github.com/rust-lang/rust/pull/61682/
1593 [61268]: https://github.com/rust-lang/rust/pull/61268/
1594 [61342]: https://github.com/rust-lang/rust/pull/61342/
1595 [61347]: https://github.com/rust-lang/rust/pull/61347/
1596 [61100]: https://github.com/rust-lang/rust/pull/61100/
1597 [61203]: https://github.com/rust-lang/rust/pull/61203/
1598 [61229]: https://github.com/rust-lang/rust/pull/61229/
1599 [60932]: https://github.com/rust-lang/rust/pull/60932/
1600 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1601 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1602 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1603 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1604 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1605 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1606 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1607 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1608 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1609 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1610 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1611 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1612 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1613 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1614 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1615 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1616 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1617 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1618 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1619 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1620 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1621 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1622 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1623 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1626 Version 1.36.0 (2019-07-04)
1627 ==========================
1631 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1632 - [The order of traits in trait objects no longer affects the semantics of that
1633 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1634 `dyn fmt::Debug + Send`, where this was previously not the case.
1638 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1639 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1640 - [`mem::needs_drop` is now available as a const fn.][60364]
1641 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1642 - [`String` now implements `BorrowMut<str>`.][60404]
1643 - [`io::Cursor` now implements `Default`.][60234]
1644 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1645 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1646 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1647 environment has access to heap memory allocation.
1648 - [`String` now implements `From<&String>`.][59825]
1649 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1650 return a tuple of each argument when there is multiple arguments.
1651 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1656 - [`VecDeque::rotate_left`]
1657 - [`VecDeque::rotate_right`]
1658 - [`Iterator::copied`]
1660 - [`io::IoSliceMut`]
1661 - [`Read::read_vectored`]
1662 - [`Write::write_vectored`]
1663 - [`str::as_mut_ptr`]
1664 - [`mem::MaybeUninit`]
1665 - [`pointer::align_offset`]
1666 - [`future::Future`]
1668 - [`task::RawWaker`]
1669 - [`task::RawWakerVTable`]
1675 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1676 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1678 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1682 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1689 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1690 longer recommended, and will be deprecated in 1.39.0.
1692 [60318]: https://github.com/rust-lang/rust/pull/60318/
1693 [60364]: https://github.com/rust-lang/rust/pull/60364/
1694 [60370]: https://github.com/rust-lang/rust/pull/60370/
1695 [60404]: https://github.com/rust-lang/rust/pull/60404/
1696 [60234]: https://github.com/rust-lang/rust/pull/60234/
1697 [60244]: https://github.com/rust-lang/rust/pull/60244/
1698 [58623]: https://github.com/rust-lang/rust/pull/58623/
1699 [59648]: https://github.com/rust-lang/rust/pull/59648/
1700 [59675]: https://github.com/rust-lang/rust/pull/59675/
1701 [59825]: https://github.com/rust-lang/rust/pull/59825/
1702 [59826]: https://github.com/rust-lang/rust/pull/59826/
1703 [59445]: https://github.com/rust-lang/rust/pull/59445/
1704 [59114]: https://github.com/rust-lang/rust/pull/59114/
1705 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1706 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1707 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1708 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1709 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1710 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1711 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1712 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1713 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1714 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1715 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1716 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1717 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1718 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1719 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1720 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1721 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1722 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1723 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1724 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1727 Version 1.35.0 (2019-05-23)
1728 ==========================
1732 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1733 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1734 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1736 unsafe fn call_unsafe(func: unsafe fn()) {
1741 unsafe { call_unsafe(|| {}); }
1748 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1749 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1750 - [Added the `wasm32-unknown-wasi` target.][59464]
1755 - [`Thread` will now show its ID in `Debug` output.][59460]
1756 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1757 - [`alloc::System` now implements `Default`.][59451]
1758 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1760 - [`char::{ToLowercase, ToUppercase}` now
1761 implement `ExactSizeIterator`.][58778]
1762 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1763 - [Removed the `Read` trait bounds
1764 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1765 - [You can now call the `dbg!` macro without any parameters to print the file
1766 and line where it is called.][57847]
1767 - [In place ASCII case conversions are now up to 4× faster.][59283]
1768 e.g. `str::make_ascii_lowercase`
1769 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1776 - [`RefCell::replace_with`]
1777 - [`RefCell::map_split`]
1779 - [`Range::contains`]
1780 - [`RangeFrom::contains`]
1781 - [`RangeTo::contains`]
1782 - [`RangeInclusive::contains`]
1783 - [`RangeToInclusive::contains`]
1784 - [`Option::copied`]
1788 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1789 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1794 - [The Rust toolchain is now available natively for musl based distros.][58575]
1796 [59460]: https://github.com/rust-lang/rust/pull/59460/
1797 [59464]: https://github.com/rust-lang/rust/pull/59464/
1798 [59500]: https://github.com/rust-lang/rust/pull/59500/
1799 [59512]: https://github.com/rust-lang/rust/pull/59512/
1800 [59580]: https://github.com/rust-lang/rust/pull/59580/
1801 [59283]: https://github.com/rust-lang/rust/pull/59283/
1802 [59451]: https://github.com/rust-lang/rust/pull/59451/
1803 [59076]: https://github.com/rust-lang/rust/pull/59076/
1804 [58778]: https://github.com/rust-lang/rust/pull/58778/
1805 [58717]: https://github.com/rust-lang/rust/pull/58717/
1806 [58369]: https://github.com/rust-lang/rust/pull/58369/
1807 [58423]: https://github.com/rust-lang/rust/pull/58423/
1808 [58080]: https://github.com/rust-lang/rust/pull/58080/
1809 [57847]: https://github.com/rust-lang/rust/pull/57847/
1810 [58575]: https://github.com/rust-lang/rust/pull/58575
1811 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1812 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1813 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1814 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1815 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1816 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1817 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1818 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1819 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1820 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1821 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1822 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1824 Version 1.34.2 (2019-05-14)
1825 ===========================
1827 * [Destabilize the `Error::type_id` function due to a security
1828 vulnerability][60785] ([CVE-2019-12083])
1830 [60785]: https://github.com/rust-lang/rust/pull/60785
1831 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1833 Version 1.34.1 (2019-04-25)
1834 ===========================
1836 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1837 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1838 * [Fix Clippy panic when checking some macros][clippy/3805]
1840 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1841 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1842 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1844 Version 1.34.0 (2019-04-11)
1845 ==========================
1849 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1850 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1852 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1853 `#[attr{}]` procedural macros.][57367]
1854 - [You can now write `extern crate self as foo;`][57407] to import your
1855 crate's root into the extern prelude.
1860 - [You can now target `riscv64imac-unknown-none-elf` and
1861 `riscv64gc-unknown-none-elf`.][58406]
1862 - [You can now enable linker plugin LTO optimisations with
1863 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1864 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1866 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1871 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1872 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1873 the `Hash` trait to create an iterator.
1874 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1875 methods.][58421] Most notably you no longer require the `Ord` trait to create
1877 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1878 for all numeric types.][58044]
1879 - [Indexing a `str` is now generic over all types that
1880 implement `SliceIndex<str>`.][57604]
1881 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1882 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1883 produce a warning if their returning type is unused.
1884 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1885 `overflowing_pow` are now available for all numeric types.][57873] These are
1886 equivalent to methods such as `wrapping_add` for the `pow` operation.
1894 * [`Error::type_id`]
1895 * [`atomic::AtomicI16`]
1896 * [`atomic::AtomicI32`]
1897 * [`atomic::AtomicI64`]
1898 * [`atomic::AtomicI8`]
1899 * [`atomic::AtomicU16`]
1900 * [`atomic::AtomicU32`]
1901 * [`atomic::AtomicU64`]
1902 * [`atomic::AtomicU8`]
1903 * [`convert::Infallible`]
1904 * [`convert::TryFrom`]
1905 * [`convert::TryInto`]
1907 * [`iter::successors`]
1908 * [`num::NonZeroI128`]
1909 * [`num::NonZeroI16`]
1910 * [`num::NonZeroI32`]
1911 * [`num::NonZeroI64`]
1912 * [`num::NonZeroI8`]
1913 * [`num::NonZeroIsize`]
1914 * [`slice::sort_by_cached_key`]
1915 * [`str::escape_debug`]
1916 * [`str::escape_default`]
1917 * [`str::escape_unicode`]
1918 * [`str::split_ascii_whitespace`]
1921 * [`Instant::checked_add`]
1922 * [`Instant::checked_sub`]
1923 * [`SystemTime::checked_add`]
1924 * [`SystemTime::checked_sub`]
1928 - [You can now use alternative registries to crates.io.][cargo/6654]
1932 - [You can now use the `?` operator in your documentation tests without manually
1933 adding `fn main() -> Result<(), _> {}`.][56470]
1937 - [`Command::before_exec` is being replaced by the unsafe method
1938 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1939 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1940 can now use `const` functions in `static` variables.
1942 [58370]: https://github.com/rust-lang/rust/pull/58370/
1943 [58406]: https://github.com/rust-lang/rust/pull/58406/
1944 [58421]: https://github.com/rust-lang/rust/pull/58421/
1945 [58166]: https://github.com/rust-lang/rust/pull/58166/
1946 [58044]: https://github.com/rust-lang/rust/pull/58044/
1947 [58057]: https://github.com/rust-lang/rust/pull/58057/
1948 [58059]: https://github.com/rust-lang/rust/pull/58059/
1949 [57809]: https://github.com/rust-lang/rust/pull/57809/
1950 [57873]: https://github.com/rust-lang/rust/pull/57873/
1951 [57604]: https://github.com/rust-lang/rust/pull/57604/
1952 [57367]: https://github.com/rust-lang/rust/pull/57367/
1953 [57407]: https://github.com/rust-lang/rust/pull/57407/
1954 [57425]: https://github.com/rust-lang/rust/pull/57425/
1955 [57106]: https://github.com/rust-lang/rust/pull/57106/
1956 [56470]: https://github.com/rust-lang/rust/pull/56470/
1957 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1958 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1959 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1960 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1961 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1962 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1963 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1964 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1965 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1966 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1967 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1968 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1969 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1970 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1971 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1972 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1973 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1974 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1975 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1976 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1977 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1978 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1979 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1980 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1981 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1982 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1983 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1984 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1985 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1986 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1987 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1990 Version 1.33.0 (2019-02-28)
1991 ==========================
1995 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1996 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1997 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1998 E.g. You can have match statement on a `u8` that covers `0..=255` and
1999 you would no longer be required to have a `_ => unreachable!()` case.
2000 - [You can now have multiple patterns in `if let` and `while let`
2001 expressions.][57532] You can do this with the same syntax as a `match`
2011 let state = Creature::Crab("Ferris");
2013 if let Creature::Crab(name) | Creature::Person(name) = state {
2014 println!("This creature's name is: {}", name);
2018 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2019 this feature will by default produce a warning as this behaviour can be
2020 unintuitive. E.g. `if let _ = 5 {}`
2021 - [You can now use `let` bindings, assignments, expression statements,
2022 and irrefutable pattern destructuring in const functions.][57175]
2023 - [You can now call unsafe const functions.][57067] E.g.
2025 const unsafe fn foo() -> i32 { 5 }
2026 const fn bar() -> i32 {
2030 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2031 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2032 - [You can now specify a specific alignment with the `#[repr(packed)]`
2033 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2034 with an alignment of 2 bytes and a size of 6 bytes.
2035 - [You can now import an item from a module as an `_`.][56303] This allows you to
2036 import a trait's impls, and not have the name in the namespace. E.g.
2038 use std::io::Read as _;
2040 // Allowed as there is only one `Read` in the module.
2043 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2047 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2048 command line argument.][56351]
2049 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2050 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2051 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2052 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2053 information on Rust's platform support.
2054 - [Added support for the `thumbv7neon-linux-androideabi` and
2055 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2056 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2060 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2061 functions for all numeric types.][57566]
2062 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2063 are now `const` functions for all numeric types.][57105]
2064 - [The methods `is_positive` and `is_negative` are now `const` functions for
2065 all signed numeric types.][57105]
2066 - [The `get` method for all `NonZero` types is now `const`.][57167]
2067 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2068 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2069 numeric types.][57234]
2070 - [`Ipv4Addr::new` is now a `const` function][57234]
2074 - [`unix::FileExt::read_exact_at`]
2075 - [`unix::FileExt::write_all_at`]
2076 - [`Option::transpose`]
2077 - [`Result::transpose`]
2078 - [`convert::identity`]
2081 - [`marker::PhantomPinned`]
2082 - [`Vec::resize_with`]
2083 - [`VecDeque::resize_with`]
2084 - [`Duration::as_millis`]
2085 - [`Duration::as_micros`]
2086 - [`Duration::as_nanos`]
2091 - [You can now publish crates that require a feature flag to compile with
2092 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2093 - [Cargo should now rebuild a crate if a file was modified during the initial
2098 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2099 are now deprecated in the standard library, and their usage will now produce a warning.
2100 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2102 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2104 - [Libtest no longer creates a new thread for each test when
2105 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2107 [55982]: https://github.com/rust-lang/rust/pull/55982/
2108 [56243]: https://github.com/rust-lang/rust/pull/56243
2109 [56303]: https://github.com/rust-lang/rust/pull/56303/
2110 [56351]: https://github.com/rust-lang/rust/pull/56351/
2111 [56362]: https://github.com/rust-lang/rust/pull/56362
2112 [56642]: https://github.com/rust-lang/rust/pull/56642/
2113 [56769]: https://github.com/rust-lang/rust/pull/56769/
2114 [56805]: https://github.com/rust-lang/rust/pull/56805
2115 [56947]: https://github.com/rust-lang/rust/pull/56947/
2116 [57049]: https://github.com/rust-lang/rust/pull/57049/
2117 [57067]: https://github.com/rust-lang/rust/pull/57067/
2118 [57105]: https://github.com/rust-lang/rust/pull/57105
2119 [57130]: https://github.com/rust-lang/rust/pull/57130/
2120 [57167]: https://github.com/rust-lang/rust/pull/57167/
2121 [57175]: https://github.com/rust-lang/rust/pull/57175/
2122 [57234]: https://github.com/rust-lang/rust/pull/57234/
2123 [57332]: https://github.com/rust-lang/rust/pull/57332/
2124 [57465]: https://github.com/rust-lang/rust/pull/57465/
2125 [57532]: https://github.com/rust-lang/rust/pull/57532/
2126 [57535]: https://github.com/rust-lang/rust/pull/57535/
2127 [57566]: https://github.com/rust-lang/rust/pull/57566/
2128 [57615]: https://github.com/rust-lang/rust/pull/57615/
2129 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2130 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2131 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2132 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2133 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2134 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2135 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2136 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2137 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2138 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2139 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2140 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2141 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2142 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2143 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2144 [platform-support]: https://forge.rust-lang.org/platform-support.html
2146 Version 1.32.0 (2019-01-17)
2147 ==========================
2152 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2153 operator allows you to specify zero or one repetitions similar to the `*` and
2155 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2156 now always resolve to the item (`enum`, `struct`, etc.) available in the
2157 module if present, before resolving to a external crate or an item the prelude.][56759]
2160 enum Color { Red, Green, Blue }
2166 - [You can now match against `PhantomData<T>` types.][55837]
2167 - [You can now match against literals in macros with the `literal`
2168 specifier.][56072] This will match against a literal of any type.
2169 E.g. `1`, `'A'`, `"Hello World"`
2170 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2172 struct Point(i32, i32);
2175 pub fn new(x: i32, y: i32) -> Self {
2179 pub fn is_origin(&self) -> bool {
2187 - [Self can also now be used in type definitions.][56366] E.g.
2191 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2194 Cons(T, Box<Self>) // likewise here
2197 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2198 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2202 - [The default allocator has changed from jemalloc to the default allocator on
2203 your system.][55238] The compiler itself on Linux & macOS will still use
2204 jemalloc, but programs compiled with it will use the system allocator.
2205 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2209 - [`PathBuf` now implements `FromStr`.][55148]
2210 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2211 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2212 easily debug expressions in your rust program. E.g.
2215 let b = dbg!(a * 2) + 1;
2216 // ^-- prints: [src/main.rs:4] a * 2 = 4
2220 The following APIs are now `const` functions and can be used in a
2224 - [`UnsafeCell::get`]
2225 - [`char::is_ascii`]
2227 - [`ManuallyDrop::new`]
2228 - [`ManuallyDrop::into_inner`]
2229 - [`RangeInclusive::start`]
2230 - [`RangeInclusive::end`]
2231 - [`NonNull::as_ptr`]
2234 - [`Duration::as_secs`]
2235 - [`Duration::subsec_millis`]
2236 - [`Duration::subsec_micros`]
2237 - [`Duration::subsec_nanos`]
2239 - [`Ipv4Addr::is_unspecified`]
2241 - [`Ipv6Addr::octets`]
2245 - [`i8::to_be_bytes`]
2246 - [`i8::to_le_bytes`]
2247 - [`i8::to_ne_bytes`]
2248 - [`i8::from_be_bytes`]
2249 - [`i8::from_le_bytes`]
2250 - [`i8::from_ne_bytes`]
2251 - [`i16::to_be_bytes`]
2252 - [`i16::to_le_bytes`]
2253 - [`i16::to_ne_bytes`]
2254 - [`i16::from_be_bytes`]
2255 - [`i16::from_le_bytes`]
2256 - [`i16::from_ne_bytes`]
2257 - [`i32::to_be_bytes`]
2258 - [`i32::to_le_bytes`]
2259 - [`i32::to_ne_bytes`]
2260 - [`i32::from_be_bytes`]
2261 - [`i32::from_le_bytes`]
2262 - [`i32::from_ne_bytes`]
2263 - [`i64::to_be_bytes`]
2264 - [`i64::to_le_bytes`]
2265 - [`i64::to_ne_bytes`]
2266 - [`i64::from_be_bytes`]
2267 - [`i64::from_le_bytes`]
2268 - [`i64::from_ne_bytes`]
2269 - [`i128::to_be_bytes`]
2270 - [`i128::to_le_bytes`]
2271 - [`i128::to_ne_bytes`]
2272 - [`i128::from_be_bytes`]
2273 - [`i128::from_le_bytes`]
2274 - [`i128::from_ne_bytes`]
2275 - [`isize::to_be_bytes`]
2276 - [`isize::to_le_bytes`]
2277 - [`isize::to_ne_bytes`]
2278 - [`isize::from_be_bytes`]
2279 - [`isize::from_le_bytes`]
2280 - [`isize::from_ne_bytes`]
2281 - [`u8::to_be_bytes`]
2282 - [`u8::to_le_bytes`]
2283 - [`u8::to_ne_bytes`]
2284 - [`u8::from_be_bytes`]
2285 - [`u8::from_le_bytes`]
2286 - [`u8::from_ne_bytes`]
2287 - [`u16::to_be_bytes`]
2288 - [`u16::to_le_bytes`]
2289 - [`u16::to_ne_bytes`]
2290 - [`u16::from_be_bytes`]
2291 - [`u16::from_le_bytes`]
2292 - [`u16::from_ne_bytes`]
2293 - [`u32::to_be_bytes`]
2294 - [`u32::to_le_bytes`]
2295 - [`u32::to_ne_bytes`]
2296 - [`u32::from_be_bytes`]
2297 - [`u32::from_le_bytes`]
2298 - [`u32::from_ne_bytes`]
2299 - [`u64::to_be_bytes`]
2300 - [`u64::to_le_bytes`]
2301 - [`u64::to_ne_bytes`]
2302 - [`u64::from_be_bytes`]
2303 - [`u64::from_le_bytes`]
2304 - [`u64::from_ne_bytes`]
2305 - [`u128::to_be_bytes`]
2306 - [`u128::to_le_bytes`]
2307 - [`u128::to_ne_bytes`]
2308 - [`u128::from_be_bytes`]
2309 - [`u128::from_le_bytes`]
2310 - [`u128::from_ne_bytes`]
2311 - [`usize::to_be_bytes`]
2312 - [`usize::to_le_bytes`]
2313 - [`usize::to_ne_bytes`]
2314 - [`usize::from_be_bytes`]
2315 - [`usize::from_le_bytes`]
2316 - [`usize::from_ne_bytes`]
2320 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2321 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2325 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2329 - [The argument types for AVX's
2330 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2331 been changed from `*const` to `*mut` as the previous implementation
2335 [55148]: https://github.com/rust-lang/rust/pull/55148/
2336 [55238]: https://github.com/rust-lang/rust/pull/55238/
2337 [55280]: https://github.com/rust-lang/rust/pull/55280/
2338 [55610]: https://github.com/rust-lang/rust/pull/55610/
2339 [55663]: https://github.com/rust-lang/rust/pull/55663/
2340 [55702]: https://github.com/rust-lang/rust/pull/55702/
2341 [55837]: https://github.com/rust-lang/rust/pull/55837/
2342 [55843]: https://github.com/rust-lang/rust/pull/55843/
2343 [56072]: https://github.com/rust-lang/rust/pull/56072/
2344 [56245]: https://github.com/rust-lang/rust/pull/56245/
2345 [56365]: https://github.com/rust-lang/rust/pull/56365/
2346 [56366]: https://github.com/rust-lang/rust/pull/56366/
2347 [56395]: https://github.com/rust-lang/rust/pull/56395/
2348 [56759]: https://github.com/rust-lang/rust/pull/56759/
2349 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2350 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2351 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2352 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2353 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2354 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2355 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2356 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2357 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2358 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2359 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2360 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2361 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2362 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2363 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2364 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2365 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2366 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2367 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2368 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2369 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2370 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2371 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2372 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2373 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2374 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2375 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2376 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2377 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2378 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2379 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2380 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2381 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2382 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2383 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2384 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2385 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2386 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2387 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2388 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2389 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2390 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2391 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2392 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2393 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2394 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2395 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2396 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2397 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2398 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2399 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2400 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2401 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2402 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2403 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2404 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2405 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2406 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2407 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2408 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2409 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2410 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2411 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2412 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2413 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2414 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2415 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2416 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2417 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2418 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2419 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2420 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2421 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2422 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2423 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2424 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2425 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2426 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2427 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2428 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2429 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2430 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2431 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2432 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2433 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2434 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2435 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2436 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2437 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2438 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2439 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2440 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2441 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2444 Version 1.31.1 (2018-12-20)
2445 ===========================
2447 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2448 - [Fix broken go-to-definition in RLS][rls/1171]
2449 - [Fix infinite loop on hover in RLS][rls/1170]
2451 [56562]: https://github.com/rust-lang/rust/pull/56562
2452 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2453 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2455 Version 1.31.0 (2018-12-06)
2456 ==========================
2460 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2461 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2462 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2463 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2465 - [You can now define and use `const` functions.][54835] These are currently
2466 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2467 [language reference][const-reference] for what exactly is available.
2468 - [You can now use tool lints, which allow you to scope lints from external
2469 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2470 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2471 a crate, not just in exported functions.][54451]
2472 - [You can now use parentheses in pattern matches.][54497]
2476 - [Updated musl to 1.1.20][54430]
2480 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2481 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2482 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2483 into `Option<&mut T>` using the `From` trait.][53218]
2484 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2489 - [`slice::align_to`]
2490 - [`slice::align_to_mut`]
2491 - [`slice::chunks_exact`]
2492 - [`slice::chunks_exact_mut`]
2493 - [`slice::rchunks`]
2494 - [`slice::rchunks_mut`]
2495 - [`slice::rchunks_exact`]
2496 - [`slice::rchunks_exact_mut`]
2497 - [`Option::replace`]
2501 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2502 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2503 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2505 [52813]: https://github.com/rust-lang/rust/pull/52813/
2506 [53218]: https://github.com/rust-lang/rust/pull/53218/
2507 [53555]: https://github.com/rust-lang/rust/issues/53555/
2508 [54057]: https://github.com/rust-lang/rust/pull/54057/
2509 [54240]: https://github.com/rust-lang/rust/pull/54240/
2510 [54430]: https://github.com/rust-lang/rust/pull/54430/
2511 [54451]: https://github.com/rust-lang/rust/pull/54451/
2512 [54497]: https://github.com/rust-lang/rust/pull/54497/
2513 [54778]: https://github.com/rust-lang/rust/pull/54778/
2514 [54835]: https://github.com/rust-lang/rust/pull/54835/
2515 [54870]: https://github.com/rust-lang/rust/pull/54870/
2516 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2517 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2518 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2519 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2520 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2521 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2522 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2523 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2524 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2525 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2526 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2527 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2528 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2529 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2531 Version 1.30.1 (2018-11-08)
2532 ===========================
2534 - [Fixed overflow ICE in rustdoc][54199]
2535 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2537 [54199]: https://github.com/rust-lang/rust/pull/54199
2538 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2540 Version 1.30.0 (2018-10-25)
2541 ==========================
2545 - [Procedural macros are now available.][52081] These kinds of macros allow for
2546 more powerful code generation. There is a [new chapter available][proc-macros]
2547 in the Rust Programming Language book that goes further in depth.
2548 - [You can now use keywords as identifiers using the raw identifiers
2549 syntax (`r#`),][53236] e.g. `let r#for = true;`
2550 - [Using anonymous parameters in traits is now deprecated with a warning and
2551 will be a hard error in the 2018 edition.][53272]
2552 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2553 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2554 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2555 Previously, using a external crate in a module without a use statement
2556 required `let json = ::serde_json::from_str(foo);` but can now be written
2557 as `let json = serde_json::from_str(foo);`.
2558 - [You can now apply the `#[used]` attribute to static items to prevent the
2559 compiler from optimising them away, even if they appear to be unused,][51363]
2560 e.g. `#[used] static FOO: u32 = 1;`
2561 - [You can now import and reexport macros from other crates with the `use`
2562 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2563 the root module of the crate. If your macro relies on calling other local
2564 macros, it is recommended to export with the
2565 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2567 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2568 using the `vis` specifier.][53370]
2569 - [Non-macro attributes now allow all forms of literals, not just
2570 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2571 write `#[attr(true)]`.
2572 - [You can now specify a function to handle a panic in the Rust runtime with the
2573 `#[panic_handler]` attribute.][51366]
2577 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2578 - [Added the `aarch64-unknown-netbsd` target][53165]
2579 - [Upgraded to LLVM 8.][53611]
2583 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2587 - [`Ipv4Addr::BROADCAST`]
2588 - [`Ipv4Addr::LOCALHOST`]
2589 - [`Ipv4Addr::UNSPECIFIED`]
2590 - [`Ipv6Addr::LOCALHOST`]
2591 - [`Ipv6Addr::UNSPECIFIED`]
2592 - [`Iterator::find_map`]
2594 The following methods are replacement methods for `trim_left`, `trim_right`,
2595 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2597 - [`str::trim_end_matches`]
2599 - [`str::trim_start_matches`]
2600 - [`str::trim_start`]
2604 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2605 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2606 equivalent to calling `rustdoc --error-format=json`.
2607 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2611 - [`rustdoc` allows you to specify what edition to treat your code as with the
2612 `--edition` option.][54057]
2613 - [`rustdoc` now has the `--color` (specify whether to output color) and
2614 `--error-format` (specify error format, e.g. `json`) options.][53003]
2615 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2616 debug symbols.][53774]
2617 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2618 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2620 [50911]: https://github.com/rust-lang/rust/pull/50911/
2621 [51363]: https://github.com/rust-lang/rust/pull/51363/
2622 [51366]: https://github.com/rust-lang/rust/pull/51366/
2623 [52081]: https://github.com/rust-lang/rust/pull/52081/
2624 [53003]: https://github.com/rust-lang/rust/pull/53003/
2625 [53033]: https://github.com/rust-lang/rust/pull/53033/
2626 [53044]: https://github.com/rust-lang/rust/pull/53044/
2627 [53165]: https://github.com/rust-lang/rust/pull/53165/
2628 [53611]: https://github.com/rust-lang/rust/pull/53611/
2629 [53213]: https://github.com/rust-lang/rust/pull/53213/
2630 [53236]: https://github.com/rust-lang/rust/pull/53236/
2631 [53272]: https://github.com/rust-lang/rust/pull/53272/
2632 [53370]: https://github.com/rust-lang/rust/pull/53370/
2633 [53459]: https://github.com/rust-lang/rust/pull/53459/
2634 [53774]: https://github.com/rust-lang/rust/pull/53774/
2635 [53822]: https://github.com/rust-lang/rust/pull/53822/
2636 [54057]: https://github.com/rust-lang/rust/pull/54057/
2637 [54146]: https://github.com/rust-lang/rust/pull/54146/
2638 [54404]: https://github.com/rust-lang/rust/pull/54404/
2639 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2640 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2641 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2642 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2644 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2645 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2646 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2647 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2648 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2649 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2650 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2651 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2652 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2653 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2656 Version 1.29.2 (2018-10-11)
2657 ===========================
2659 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2660 - The `rls-preview` component on the windows-gnu targets has been restored.
2662 [54639]: https://github.com/rust-lang/rust/pull/54639
2665 Version 1.29.1 (2018-09-25)
2666 ===========================
2671 - The standard library's `str::repeat` function contained an out of bounds write
2672 caused by an integer overflow. This has been fixed by deterministically
2673 panicking when an overflow happens.
2675 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2679 Version 1.29.0 (2018-09-13)
2680 ==========================
2684 - [Bumped minimum LLVM version to 5.0.][51899]
2685 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2686 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2687 - [Upgraded to LLVM 7.][51966]
2691 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2692 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2693 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2694 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2696 - [`Cell<T>` now allows `T` to be unsized.][50494]
2697 - [`SocketAddr` is now stable on Redox.][52656]
2702 - [`Iterator::flatten`]
2707 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2708 `--locked` to disable this behavior.
2709 - [`cargo-install` will now allow you to cross compile an install
2710 using `--target`.][cargo/5614]
2711 - [Added the `cargo-fix` subcommand to automatically move project code from
2712 2015 edition to 2018.][cargo/5723]
2713 - [`cargo doc` can now optionally document private types using the
2714 `--document-private-items` flag.][cargo/5543]
2718 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2719 the specified level to that level.][52354] For example `--cap-lints warn`
2720 will demote `deny` and `forbid` lints to `warn`.
2721 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2722 fails and `101` if there is a panic.][52197]
2723 - [A preview of clippy has been made available through rustup.][51122]
2724 You can install the preview with `rustup component add clippy-preview`.
2728 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2729 Use `str::get_unchecked(begin..end)` instead.
2730 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2731 Consider using the `home_dir` function from
2732 https://crates.io/crates/dirs instead.
2733 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2734 - [`cfg` attributes and `--cfg` command line flags are now more
2735 strictly validated.][53893]
2737 [53893]: https://github.com/rust-lang/rust/pull/53893/
2738 [52861]: https://github.com/rust-lang/rust/pull/52861/
2739 [51966]: https://github.com/rust-lang/rust/pull/51966/
2740 [52656]: https://github.com/rust-lang/rust/pull/52656/
2741 [52239]: https://github.com/rust-lang/rust/pull/52239/
2742 [52330]: https://github.com/rust-lang/rust/pull/52330/
2743 [52354]: https://github.com/rust-lang/rust/pull/52354/
2744 [52402]: https://github.com/rust-lang/rust/pull/52402/
2745 [52103]: https://github.com/rust-lang/rust/pull/52103/
2746 [52197]: https://github.com/rust-lang/rust/pull/52197/
2747 [51807]: https://github.com/rust-lang/rust/pull/51807/
2748 [51899]: https://github.com/rust-lang/rust/pull/51899/
2749 [51912]: https://github.com/rust-lang/rust/pull/51912/
2750 [51511]: https://github.com/rust-lang/rust/pull/51511/
2751 [51619]: https://github.com/rust-lang/rust/pull/51619/
2752 [51656]: https://github.com/rust-lang/rust/pull/51656/
2753 [51178]: https://github.com/rust-lang/rust/pull/51178/
2754 [51122]: https://github.com/rust-lang/rust/pull/51122
2755 [50494]: https://github.com/rust-lang/rust/pull/50494/
2756 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2757 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2758 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2759 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2760 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2761 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2762 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2765 Version 1.28.0 (2018-08-02)
2766 ===========================
2770 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2771 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2772 the inner type across Foreign Function Interface (FFI) boundaries.
2773 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2774 and can now be used as identifiers.][51196]
2775 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2776 stable.][51241] This will allow users to specify a global allocator for
2778 - [Unit test functions marked with the `#[test]` attribute can now return
2779 `Result<(), E: Debug>` in addition to `()`.][51298]
2780 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2781 allows macros to easily target lifetimes.
2785 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2786 prioritise making smaller binary sizes. `z` is the same as `s` with the
2787 exception that it does not vectorise loops, which typically results in an even
2789 - [The short error format is now stable.][49546] Specified with
2790 `--error-format=short` this option will provide a more compressed output of
2791 rust error messages.
2792 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2793 - [Reduced the number of allocations in the macro parser.][50855] This can
2794 improve compile times of macro heavy crates on average by 5%.
2798 - [Implemented `Default` for `&mut str`.][51306]
2799 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2800 - [Implemented `Extend` for `()`.][50234]
2801 - [The `Debug` implementation of `time::Duration` should now be more easily
2802 human readable.][50364] Previously a `Duration` of one second would printed as
2803 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2804 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2805 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2806 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2807 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2808 for `PathBuf`.][50170]
2809 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2810 and `Wrapping<i128>`.][50465]
2811 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2812 possible.][51050] This can provide up to a 40% speed increase.
2813 - [Improved error messages when using `format!`.][50610]
2817 - [`Iterator::step_by`]
2818 - [`Path::ancestors`]
2819 - [`SystemTime::UNIX_EPOCH`]
2820 - [`alloc::GlobalAlloc`]
2822 - [`alloc::LayoutErr`]
2825 - [`alloc::alloc_zeroed`]
2826 - [`alloc::dealloc`]
2827 - [`alloc::realloc`]
2828 - [`alloc::handle_alloc_error`]
2829 - [`btree_map::Entry::or_default`]
2830 - [`fmt::Alignment`]
2831 - [`hash_map::Entry::or_default`]
2832 - [`iter::repeat_with`]
2833 - [`num::NonZeroUsize`]
2834 - [`num::NonZeroU128`]
2835 - [`num::NonZeroU16`]
2836 - [`num::NonZeroU32`]
2837 - [`num::NonZeroU64`]
2838 - [`num::NonZeroU8`]
2839 - [`ops::RangeBounds`]
2840 - [`slice::SliceIndex`]
2841 - [`slice::from_mut`]
2842 - [`slice::from_ref`]
2843 - [`{Any + Send + Sync}::downcast_mut`]
2844 - [`{Any + Send + Sync}::downcast_ref`]
2845 - [`{Any + Send + Sync}::is`]
2849 - [Cargo will now no longer allow you to publish crates with build scripts that
2850 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2851 considered to be immutable.
2855 - [The `suggestion_applicability` field in `rustc`'s json output is now
2856 stable.][50486] This will allow dev tools to check whether a code suggestion
2857 would apply to them.
2861 - [Rust will consider trait objects with duplicated constraints to be the same
2862 type as without the duplicated constraint.][51276] For example the below code will
2863 now fail to compile.
2868 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2871 impl Trait + Send + Send {
2872 fn test(&self) { println!("two"); }
2876 [49546]: https://github.com/rust-lang/rust/pull/49546/
2877 [50143]: https://github.com/rust-lang/rust/pull/50143/
2878 [50170]: https://github.com/rust-lang/rust/pull/50170/
2879 [50234]: https://github.com/rust-lang/rust/pull/50234/
2880 [50265]: https://github.com/rust-lang/rust/pull/50265/
2881 [50364]: https://github.com/rust-lang/rust/pull/50364/
2882 [50385]: https://github.com/rust-lang/rust/pull/50385/
2883 [50465]: https://github.com/rust-lang/rust/pull/50465/
2884 [50486]: https://github.com/rust-lang/rust/pull/50486/
2885 [50554]: https://github.com/rust-lang/rust/pull/50554/
2886 [50610]: https://github.com/rust-lang/rust/pull/50610/
2887 [50855]: https://github.com/rust-lang/rust/pull/50855/
2888 [51050]: https://github.com/rust-lang/rust/pull/51050/
2889 [51196]: https://github.com/rust-lang/rust/pull/51196/
2890 [51200]: https://github.com/rust-lang/rust/pull/51200/
2891 [51241]: https://github.com/rust-lang/rust/pull/51241/
2892 [51276]: https://github.com/rust-lang/rust/pull/51276/
2893 [51298]: https://github.com/rust-lang/rust/pull/51298/
2894 [51306]: https://github.com/rust-lang/rust/pull/51306/
2895 [51562]: https://github.com/rust-lang/rust/pull/51562/
2896 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2897 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2898 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2899 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2900 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2901 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2902 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2903 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2904 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2905 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2906 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2907 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2908 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2909 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2910 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2911 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2912 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2913 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2914 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2915 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2916 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2917 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2918 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2919 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2920 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2921 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2922 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2923 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2924 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2925 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2927 Version 1.27.2 (2018-07-20)
2928 ===========================
2933 - The borrow checker was fixed to avoid potential unsoundness when using
2934 match ergonomics: [#52213][52213].
2936 [52213]: https://github.com/rust-lang/rust/issues/52213
2938 Version 1.27.1 (2018-07-10)
2939 ===========================
2944 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2945 when running, which enabled executing code as some other user on a
2946 given machine. This release fixes that vulnerability; you can read
2947 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2949 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2954 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2955 match ergonomics: [#51415][51415], [#49534][49534].
2957 [51415]: https://github.com/rust-lang/rust/issues/51415
2958 [49534]: https://github.com/rust-lang/rust/issues/49534
2959 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2960 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2962 Version 1.27.0 (2018-06-21)
2963 ==========================
2967 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2968 be used as an identifier.
2969 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2970 bare `Trait` syntax, and should make it clearer when being used in tandem with
2971 `impl Trait` because it is equivalent to the following syntax:
2972 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2973 `Box<Trait> == Box<dyn Trait>`.
2974 - [Attributes on generic parameters such as types and lifetimes are
2975 now stable.][48851] e.g.
2976 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2977 - [The `#[must_use]` attribute can now also be used on functions as well as
2978 types.][48925] It provides a lint that by default warns users when the
2979 value returned by a function has not been used.
2983 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2987 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2988 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2989 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2990 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2991 the `cfg` attribute.
2992 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2993 std are now available in core.][49896]
2994 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2996 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2997 that the operation isn't done in place.
2998 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2999 the `#[must_use]` attribute][49533] to warn about unused potentially
3000 expensive allocations.
3004 - [`DoubleEndedIterator::rfind`]
3005 - [`DoubleEndedIterator::rfold`]
3006 - [`DoubleEndedIterator::try_rfold`]
3007 - [`Duration::from_micros`]
3008 - [`Duration::from_nanos`]
3009 - [`Duration::subsec_micros`]
3010 - [`Duration::subsec_millis`]
3011 - [`HashMap::remove_entry`]
3012 - [`Iterator::try_fold`]
3013 - [`Iterator::try_for_each`]
3015 - [`Option::filter`]
3016 - [`String::replace_range`]
3017 - [`Take::set_limit`]
3018 - [`hint::unreachable_unchecked`]
3019 - [`os::unix::process::parent_id`]
3020 - [`ptr::swap_nonoverlapping`]
3021 - [`slice::rsplit_mut`]
3023 - [`slice::swap_with_slice`]
3027 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3028 `readme`, and `repository` fields.][cargo/5386]
3029 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3030 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3031 a different directory than `target` for placing compilation artifacts.
3032 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3033 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3034 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3035 where cargo would infer a binary, Cargo will produce a warning. You can
3036 disable this feature ahead of time by setting any of the following to false:
3037 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3038 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3039 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3043 - [Added “The Rustc book” into the official documentation.][49707]
3044 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3045 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3049 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3050 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3051 compile, `"".is_empty()` will still compile.
3052 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3053 will only print the inner type.][48553] E.g.
3054 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3055 not `AtomicBool(true)`.
3056 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3057 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3058 alignment should cover all use cases.
3059 - The `.description()` method on the `std::error::Error` trait
3060 [has been soft-deprecated][50163]. It is no longer required to implement it.
3062 [48553]: https://github.com/rust-lang/rust/pull/48553/
3063 [48851]: https://github.com/rust-lang/rust/pull/48851/
3064 [48925]: https://github.com/rust-lang/rust/pull/48925/
3065 [49533]: https://github.com/rust-lang/rust/pull/49533/
3066 [49623]: https://github.com/rust-lang/rust/pull/49623/
3067 [49630]: https://github.com/rust-lang/rust/pull/49630/
3068 [49664]: https://github.com/rust-lang/rust/pull/49664/
3069 [49699]: https://github.com/rust-lang/rust/pull/49699/
3070 [49707]: https://github.com/rust-lang/rust/pull/49707/
3071 [49719]: https://github.com/rust-lang/rust/pull/49719/
3072 [49896]: https://github.com/rust-lang/rust/pull/49896/
3073 [49968]: https://github.com/rust-lang/rust/pull/49968/
3074 [50163]: https://github.com/rust-lang/rust/pull/50163
3075 [50177]: https://github.com/rust-lang/rust/pull/50177/
3076 [50378]: https://github.com/rust-lang/rust/pull/50378/
3077 [50398]: https://github.com/rust-lang/rust/pull/50398/
3078 [50423]: https://github.com/rust-lang/rust/pull/50423/
3079 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3080 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3081 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3082 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3083 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3084 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3085 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3086 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3087 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3088 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3089 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3090 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3091 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3092 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3093 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3094 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3095 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3096 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3097 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3098 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3099 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3100 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3101 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3102 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3103 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3104 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3105 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3106 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3107 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3108 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3111 Version 1.26.2 (2018-06-05)
3112 ==========================
3117 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3119 [51117]: https://github.com/rust-lang/rust/issues/51117
3122 Version 1.26.1 (2018-05-29)
3123 ==========================
3128 - [RLS now works on Windows.][50646]
3129 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3135 - [`fn main() -> impl Trait` no longer works for non-Termination
3137 This reverts an accidental stabilization.
3138 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3139 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3141 [50646]: https://github.com/rust-lang/rust/issues/50646
3142 [50656]: https://github.com/rust-lang/rust/pull/50656
3143 [50812]: https://github.com/rust-lang/rust/pull/50812
3144 [50950]: https://github.com/rust-lang/rust/issues/50950
3145 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3147 Version 1.26.0 (2018-05-10)
3148 ==========================
3152 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3153 implement either or both traits.][49299]
3154 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3155 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3156 lifetime can be elided.][49458]
3157 - [`impl Trait` is now stable allowing you to have abstract types in returns
3158 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3159 `fn open(path: impl AsRef<Path>)`.
3160 - [Pattern matching will now automatically apply dereferences.][49394]
3161 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3162 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3163 - [A lot of operations are now available in a const context.][46882] E.g. You
3164 can now index into constant arrays, reference and dereference into constants,
3165 and use tuple struct constructors.
3166 - [Fixed entry slice patterns are now stable.][48516] E.g.
3168 let points = [1, 2, 3, 4];
3170 [1, 2, 3, 4] => println!("All points were sequential."),
3171 _ => println!("Not all points were sequential."),
3178 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3179 - [Fixed exponential projection complexity on nested types.][48296]
3180 This can provide up to a ~12% reduction in compile times for certain crates.
3181 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3182 to remap path prefixes outputted by the compiler.
3183 - [Added `powerpc-unknown-netbsd` target.][48281]
3187 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3188 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3189 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3190 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3191 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3192 - [`ascii::escape_default` is now available in libcore.][48735]
3193 - [Trailing commas are now supported in std and core macros.][48056]
3194 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3195 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3200 - [`*const T::copy_to_nonoverlapping`]
3201 - [`*const T::copy_to`]
3202 - [`*const T::read_unaligned`]
3203 - [`*const T::read_volatile`]
3204 - [`*const T::read`]
3206 - [`*const T::wrapping_add`]
3207 - [`*const T::wrapping_sub`]
3209 - [`*mut T::copy_to_nonoverlapping`]
3210 - [`*mut T::copy_to`]
3211 - [`*mut T::read_unaligned`]
3212 - [`*mut T::read_volatile`]
3214 - [`*mut T::replace`]
3217 - [`*mut T::wrapping_add`]
3218 - [`*mut T::wrapping_sub`]
3219 - [`*mut T::write_bytes`]
3220 - [`*mut T::write_unaligned`]
3221 - [`*mut T::write_volatile`]
3224 - [`FromUtf8Error::as_bytes`]
3225 - [`LocalKey::try_with`]
3226 - [`Option::cloned`]
3227 - [`btree_map::Entry::and_modify`]
3228 - [`fs::read_to_string`]
3231 - [`hash_map::Entry::and_modify`]
3232 - [`iter::FusedIterator`]
3233 - [`ops::RangeInclusive`]
3234 - [`ops::RangeToInclusive`]
3236 - [`slice::rotate_left`]
3237 - [`slice::rotate_right`]
3238 - [`String::retain`]
3243 - [Cargo will now output path to custom commands when `-v` is
3244 passed with `--list`][cargo/5041]
3245 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3249 - [The second edition of "The Rust Programming Language" book is now recommended
3250 over the first.][48404]
3255 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3256 syntax is now invalid.
3258 use std::ops::Fn as dyn;
3259 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3261 - [The result of dereferences are no longer promoted to `'static`.][47408]
3265 const PAIR: &(i32, i32) = &(0, 1);
3266 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3269 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3270 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3272 - [Removed hoedown from rustdoc.][48274]
3273 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3275 [46882]: https://github.com/rust-lang/rust/pull/46882
3276 [47379]: https://github.com/rust-lang/rust/pull/47379
3277 [47408]: https://github.com/rust-lang/rust/pull/47408
3278 [47813]: https://github.com/rust-lang/rust/pull/47813
3279 [48056]: https://github.com/rust-lang/rust/pull/48056
3280 [48125]: https://github.com/rust-lang/rust/pull/48125
3281 [48166]: https://github.com/rust-lang/rust/pull/48166
3282 [48235]: https://github.com/rust-lang/rust/pull/48235
3283 [48274]: https://github.com/rust-lang/rust/pull/48274
3284 [48281]: https://github.com/rust-lang/rust/pull/48281
3285 [48296]: https://github.com/rust-lang/rust/pull/48296
3286 [48326]: https://github.com/rust-lang/rust/pull/48326
3287 [48359]: https://github.com/rust-lang/rust/pull/48359
3288 [48404]: https://github.com/rust-lang/rust/pull/48404
3289 [48481]: https://github.com/rust-lang/rust/pull/48481
3290 [48516]: https://github.com/rust-lang/rust/pull/48516
3291 [48628]: https://github.com/rust-lang/rust/pull/48628
3292 [48629]: https://github.com/rust-lang/rust/pull/48629
3293 [48657]: https://github.com/rust-lang/rust/pull/48657
3294 [48735]: https://github.com/rust-lang/rust/pull/48735
3295 [48978]: https://github.com/rust-lang/rust/pull/48978
3296 [49101]: https://github.com/rust-lang/rust/pull/49101
3297 [49109]: https://github.com/rust-lang/rust/pull/49109
3298 [49121]: https://github.com/rust-lang/rust/pull/49121
3299 [49162]: https://github.com/rust-lang/rust/pull/49162
3300 [49184]: https://github.com/rust-lang/rust/pull/49184
3301 [49234]: https://github.com/rust-lang/rust/pull/49234
3302 [49255]: https://github.com/rust-lang/rust/pull/49255
3303 [49299]: https://github.com/rust-lang/rust/pull/49299
3304 [49305]: https://github.com/rust-lang/rust/pull/49305
3305 [49394]: https://github.com/rust-lang/rust/pull/49394
3306 [49458]: https://github.com/rust-lang/rust/pull/49458
3307 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3308 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3309 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3310 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3311 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3312 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3313 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3314 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3315 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3316 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3317 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3318 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3319 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3320 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3321 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3322 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3323 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3324 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3325 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3326 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3327 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3328 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3329 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3330 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3331 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3332 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3333 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3334 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3335 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3336 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3337 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3338 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3339 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3340 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3341 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3342 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3343 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3344 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3345 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3346 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3347 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3348 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3351 Version 1.25.0 (2018-03-29)
3352 ==========================
3356 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3357 - [You can now use nested groups of imports.][47948]
3358 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3359 - [You can now have `|` at the start of a match arm.][47947] e.g.
3361 enum Foo { A, B, C }
3367 | Foo::B => println!("AB"),
3368 | Foo::C => println!("C"),
3375 - [Upgraded to LLVM 6.][47828]
3376 - [Added `-C lto=val` option.][47521]
3377 - [Added `i586-unknown-linux-musl` target][47282]
3381 - [Impl Send for `process::Command` on Unix.][47760]
3382 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3383 - [`UnsafeCell::into_inner` is now safe.][47204]
3384 - [Implement libstd for CloudABI.][47268]
3385 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3386 - [Implement `AsRef<Path>` for Component][46985]
3387 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3388 - [Moved `Duration` to libcore.][46666]
3392 - [`Location::column`]
3395 The following functions can now be used in a constant expression.
3396 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3397 - [`Duration::new`][47300]
3398 - [`Duration::from_secs`][47300]
3399 - [`Duration::from_millis`][47300]
3403 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3404 - [`cargo new` now defaults to creating a binary crate, instead of a
3405 library crate.][cargo/5029]
3409 - [Rust by example is now shipped with new releases][46196]
3413 - [Deprecated `net::lookup_host`.][47510]
3414 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3415 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3416 around indexing operations (see [#47349][47349]). This has been fixed (which also
3417 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3418 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3420 [33903]: https://github.com/rust-lang/rust/pull/33903
3421 [47947]: https://github.com/rust-lang/rust/pull/47947
3422 [47948]: https://github.com/rust-lang/rust/pull/47948
3423 [47760]: https://github.com/rust-lang/rust/pull/47760
3424 [47790]: https://github.com/rust-lang/rust/pull/47790
3425 [47828]: https://github.com/rust-lang/rust/pull/47828
3426 [47398]: https://github.com/rust-lang/rust/pull/47398
3427 [47510]: https://github.com/rust-lang/rust/pull/47510
3428 [47521]: https://github.com/rust-lang/rust/pull/47521
3429 [47204]: https://github.com/rust-lang/rust/pull/47204
3430 [47251]: https://github.com/rust-lang/rust/pull/47251
3431 [47268]: https://github.com/rust-lang/rust/pull/47268
3432 [47282]: https://github.com/rust-lang/rust/pull/47282
3433 [47300]: https://github.com/rust-lang/rust/pull/47300
3434 [47349]: https://github.com/rust-lang/rust/pull/47349
3435 [46931]: https://github.com/rust-lang/rust/pull/46931
3436 [46985]: https://github.com/rust-lang/rust/pull/46985
3437 [47006]: https://github.com/rust-lang/rust/pull/47006
3438 [46830]: https://github.com/rust-lang/rust/pull/46830
3439 [46095]: https://github.com/rust-lang/rust/pull/46095
3440 [46666]: https://github.com/rust-lang/rust/pull/46666
3441 [46196]: https://github.com/rust-lang/rust/pull/46196
3442 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3443 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3444 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3445 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3446 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3449 Version 1.24.1 (2018-03-01)
3450 ==========================
3452 - [Do not abort when unwinding through FFI][48251]
3453 - [Emit UTF-16 files for linker arguments on Windows][48318]
3454 - [Make the error index generator work again][48308]
3455 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3457 [48251]: https://github.com/rust-lang/rust/issues/48251
3458 [48308]: https://github.com/rust-lang/rust/issues/48308
3459 [48318]: https://github.com/rust-lang/rust/issues/48318
3460 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3463 Version 1.24.0 (2018-02-15)
3464 ==========================
3468 - [External `sysv64` ffi is now available.][46528]
3469 eg. `extern "sysv64" fn foo () {}`
3473 - [rustc now uses 16 codegen units by default for release builds.][46910]
3474 For the fastest builds, utilize `codegen-units=1`.
3475 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3476 - [Add `aarch64-unknown-openbsd` support][46760]
3480 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3481 improvement in performance in the majority of cases.
3482 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3483 with Windows.][46798]
3484 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3485 - [impl `From<bool>` for `AtomicBool`][46293]
3486 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3487 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3488 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3489 - [float::from_bits now just uses transmute.][46012] This provides
3490 some optimisations from LLVM.
3491 - [Copied `AsciiExt` methods onto `char`][46077]
3492 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3493 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3494 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3495 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3499 - [`RefCell::replace`]
3501 - [`atomic::spin_loop_hint`]
3503 The following functions can now be used in a constant expression.
3504 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3506 - [`AtomicBool::new`][46287]
3507 - [`AtomicUsize::new`][46287]
3508 - [`AtomicIsize::new`][46287]
3509 - [`AtomicPtr::new`][46287]
3510 - [`Cell::new`][46287]
3511 - [`{integer}::min_value`][46287]
3512 - [`{integer}::max_value`][46287]
3513 - [`mem::size_of`][46287]
3514 - [`mem::align_of`][46287]
3515 - [`ptr::null`][46287]
3516 - [`ptr::null_mut`][46287]
3517 - [`RefCell::new`][46287]
3518 - [`UnsafeCell::new`][46287]
3522 - [Added a `workspace.default-members` config that
3523 overrides implied `--all` in virtual workspaces.][cargo/4743]
3524 - [Enable incremental by default on development builds.][cargo/4817] Also added
3525 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3526 per-project or global basis respectively.
3533 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3534 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3535 in accordance with IETF RFC 4291 §2.2.
3536 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3537 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3538 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3539 - [Leading zeros in tuple struct members is now an error][47084]
3540 - [`column!()` macro is one-based instead of zero-based][46977]
3541 - [`fmt::Arguments` can no longer be shared across threads][45198]
3542 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3543 - [Cargo sets a different working directory for the compiler][cargo/4788]
3545 [44884]: https://github.com/rust-lang/rust/pull/44884
3546 [45198]: https://github.com/rust-lang/rust/pull/45198
3547 [45506]: https://github.com/rust-lang/rust/pull/45506
3548 [45904]: https://github.com/rust-lang/rust/pull/45904
3549 [45990]: https://github.com/rust-lang/rust/pull/45990
3550 [46012]: https://github.com/rust-lang/rust/pull/46012
3551 [46077]: https://github.com/rust-lang/rust/pull/46077
3552 [46094]: https://github.com/rust-lang/rust/pull/46094
3553 [46284]: https://github.com/rust-lang/rust/pull/46284
3554 [46287]: https://github.com/rust-lang/rust/pull/46287
3555 [46293]: https://github.com/rust-lang/rust/pull/46293
3556 [46528]: https://github.com/rust-lang/rust/pull/46528
3557 [46671]: https://github.com/rust-lang/rust/pull/46671
3558 [46713]: https://github.com/rust-lang/rust/pull/46713
3559 [46735]: https://github.com/rust-lang/rust/pull/46735
3560 [46749]: https://github.com/rust-lang/rust/pull/46749
3561 [46760]: https://github.com/rust-lang/rust/pull/46760
3562 [46798]: https://github.com/rust-lang/rust/pull/46798
3563 [46828]: https://github.com/rust-lang/rust/pull/46828
3564 [46831]: https://github.com/rust-lang/rust/pull/46831
3565 [46833]: https://github.com/rust-lang/rust/pull/46833
3566 [46910]: https://github.com/rust-lang/rust/pull/46910
3567 [46977]: https://github.com/rust-lang/rust/pull/46977
3568 [47018]: https://github.com/rust-lang/rust/pull/47018
3569 [47080]: https://github.com/rust-lang/rust/pull/47080
3570 [47084]: https://github.com/rust-lang/rust/pull/47084
3571 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3572 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3573 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3574 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3575 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3576 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3579 Version 1.23.0 (2018-01-04)
3580 ==========================
3584 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3585 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3586 Which should fix some confusing errors in some operations.
3590 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3591 undefined behavior.][45920]
3592 - [rustc now suggests renaming import if names clash.][45660]
3593 - [Display errors/warnings correctly when there are zero-width or
3594 wide characters.][45711]
3595 - [rustc now avoids unnecessary copies of arguments that are
3596 simple bindings][45380] This should improve memory usage on average by 5-10%.
3597 - [Updated musl used to build musl rustc to 1.1.17][45393]
3601 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3602 - [Implement Hash for raw pointers to unsized types][45483]
3603 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3604 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3605 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3606 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3607 and `<*mut T>::as_mut`][44932]
3608 - [Optimized `Thread::{park, unpark}` implementation][45524]
3609 - [Improved `SliceExt::binary_search` performance.][45333]
3610 - [impl `FromIterator<()>` for `()`][45379]
3611 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3619 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3620 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3621 - [Added unit test checking to `cargo check`][cargo/4592]
3622 - [Cargo now lets you install a specific version
3623 using `cargo install --version`][cargo/4637]
3627 - [Releases now ship with the Cargo book documentation.][45692]
3628 - [rustdoc now prints rendering warnings on every run.][45324]
3632 - [Changes have been made to type equality to make it more correct,
3633 in rare cases this could break some code.][45853] [Tracking issue for
3634 further information][45852]
3635 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3636 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3637 Android 9, the minimum supported version is Android 14.
3638 - [Bumped the minimum LLVM to 3.9][45326]
3640 [44042]: https://github.com/rust-lang/rust/pull/44042
3641 [44932]: https://github.com/rust-lang/rust/pull/44932
3642 [45267]: https://github.com/rust-lang/rust/pull/45267
3643 [45324]: https://github.com/rust-lang/rust/pull/45324
3644 [45326]: https://github.com/rust-lang/rust/pull/45326
3645 [45333]: https://github.com/rust-lang/rust/pull/45333
3646 [45379]: https://github.com/rust-lang/rust/pull/45379
3647 [45380]: https://github.com/rust-lang/rust/pull/45380
3648 [45393]: https://github.com/rust-lang/rust/pull/45393
3649 [45435]: https://github.com/rust-lang/rust/pull/45435
3650 [45483]: https://github.com/rust-lang/rust/pull/45483
3651 [45524]: https://github.com/rust-lang/rust/pull/45524
3652 [45571]: https://github.com/rust-lang/rust/pull/45571
3653 [45580]: https://github.com/rust-lang/rust/pull/45580
3654 [45610]: https://github.com/rust-lang/rust/pull/45610
3655 [45660]: https://github.com/rust-lang/rust/pull/45660
3656 [45692]: https://github.com/rust-lang/rust/pull/45692
3657 [45711]: https://github.com/rust-lang/rust/pull/45711
3658 [45772]: https://github.com/rust-lang/rust/pull/45772
3659 [45852]: https://github.com/rust-lang/rust/issues/45852
3660 [45853]: https://github.com/rust-lang/rust/pull/45853
3661 [45887]: https://github.com/rust-lang/rust/pull/45887
3662 [45920]: https://github.com/rust-lang/rust/pull/45920
3663 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3664 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3665 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3668 Version 1.22.1 (2017-11-22)
3669 ==========================
3671 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3673 [46183]: https://github.com/rust-lang/rust/pull/46183
3675 Version 1.22.0 (2017-11-22)
3676 ==========================
3680 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3681 - [Now accepts underscores in unicode escapes][43716]
3682 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3683 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3687 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3688 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3689 This should decrease compile times for debug builds.
3690 - [strict memory alignment now enabled on ARMv6][45094]
3691 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3695 - [Allow atomic operations up to 32 bits
3696 on `armv5te_unknown_linux_gnueabi`][44978]
3697 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3698 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3699 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3700 - [Properly detect overflow in `Instant += Duration`.][44220]
3701 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3702 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3703 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3710 - [Cargo will now build multi file examples in subdirectories of the `examples`
3711 folder that have a `main.rs` file.][cargo/4496]
3712 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3713 the old format will continue to work and can be updated with `cargo update`.
3714 - [Now supports vendoring git repositories][cargo/3992]
3718 - [`libbacktrace` is now available on Apple platforms.][44251]
3719 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3720 This now lets you specify that a given code example will fail to compile.
3724 - [The minimum Android version that rustc can build for has been bumped
3725 to `4.0` from `2.3`][45656]
3726 - [Allowing `T op= &T` for numeric types has broken some type
3727 inference cases][45480]
3730 [42526]: https://github.com/rust-lang/rust/pull/42526
3731 [43017]: https://github.com/rust-lang/rust/pull/43017
3732 [43716]: https://github.com/rust-lang/rust/pull/43716
3733 [43949]: https://github.com/rust-lang/rust/pull/43949
3734 [44015]: https://github.com/rust-lang/rust/pull/44015
3735 [44220]: https://github.com/rust-lang/rust/pull/44220
3736 [44251]: https://github.com/rust-lang/rust/pull/44251
3737 [44287]: https://github.com/rust-lang/rust/pull/44287
3738 [44303]: https://github.com/rust-lang/rust/pull/44303
3739 [44456]: https://github.com/rust-lang/rust/pull/44456
3740 [44466]: https://github.com/rust-lang/rust/pull/44466
3741 [44895]: https://github.com/rust-lang/rust/pull/44895
3742 [44966]: https://github.com/rust-lang/rust/pull/44966
3743 [44978]: https://github.com/rust-lang/rust/pull/44978
3744 [45041]: https://github.com/rust-lang/rust/pull/45041
3745 [45064]: https://github.com/rust-lang/rust/pull/45064
3746 [45075]: https://github.com/rust-lang/rust/pull/45075
3747 [45094]: https://github.com/rust-lang/rust/pull/45094
3748 [45095]: https://github.com/rust-lang/rust/pull/45095
3749 [45480]: https://github.com/rust-lang/rust/issues/45480
3750 [45656]: https://github.com/rust-lang/rust/pull/45656
3751 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3752 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3753 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3760 Version 1.21.0 (2017-10-12)
3761 ==========================
3765 - [You can now use static references for literals.][43838]
3769 let x: &'static u32 = &0;
3772 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3775 my_macro!(Vec<i32>::new); // Always worked
3776 my_macro!(Vec::<i32>::new); // Now works
3781 - [Upgraded jemalloc to 4.5.0][43911]
3782 - [Enabled unwinding panics on Redox][43917]
3783 - [Now runs LLVM in parallel during translation phase.][43506]
3784 This should reduce peak memory usage.
3788 - [Generate builtin impls for `Clone` for all arrays and tuples that
3789 are `T: Clone`][43690]
3790 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3791 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3792 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3797 [`std::mem::discriminant`]
3801 - [You can now call `cargo install` with multiple package names][cargo/4216]
3802 - [Cargo commands inside a virtual workspace will now implicitly
3803 pass `--all`][cargo/4335]
3804 - [Added a `[patch]` section to `Cargo.toml` to handle
3805 prepublication dependencies][cargo/4123] [RFC 1969]
3806 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3807 like patterns][cargo/4270]
3808 - [Added the `--all-targets` option][cargo/4400]
3809 - [Using required dependencies as a feature is now deprecated and emits
3810 a warning][cargo/4364]
3815 - [Cargo docs are moving][43916]
3816 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3817 - [The rustdoc book is now available][43863]
3818 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3819 - [Added a preview of RLS has been made available through rustup][44204]
3820 Install with `rustup component add rls-preview`
3821 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3822 Previously only showed `std::os::unix`.
3826 - [Changes in method matching against higher-ranked types][43880] This may cause
3827 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3828 - [rustc's JSON error output's byte position start at top of file.][42973]
3829 Was previously relative to the rustc's internal `CodeMap` struct which
3830 required the unstable library `libsyntax` to correctly use.
3831 - [`unused_results` lint no longer ignores booleans][43728]
3833 [42565]: https://github.com/rust-lang/rust/pull/42565
3834 [42973]: https://github.com/rust-lang/rust/pull/42973
3835 [43348]: https://github.com/rust-lang/rust/pull/43348
3836 [43459]: https://github.com/rust-lang/rust/pull/43459
3837 [43506]: https://github.com/rust-lang/rust/pull/43506
3838 [43540]: https://github.com/rust-lang/rust/pull/43540
3839 [43690]: https://github.com/rust-lang/rust/pull/43690
3840 [43728]: https://github.com/rust-lang/rust/pull/43728
3841 [43838]: https://github.com/rust-lang/rust/pull/43838
3842 [43863]: https://github.com/rust-lang/rust/pull/43863
3843 [43880]: https://github.com/rust-lang/rust/pull/43880
3844 [43911]: https://github.com/rust-lang/rust/pull/43911
3845 [43916]: https://github.com/rust-lang/rust/pull/43916
3846 [43917]: https://github.com/rust-lang/rust/pull/43917
3847 [44204]: https://github.com/rust-lang/rust/pull/44204
3848 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3849 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3850 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3851 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3852 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3853 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3854 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3855 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3856 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3858 Version 1.20.0 (2017-08-31)
3859 ===========================
3863 - [Associated constants are now stabilised.][42809]
3864 - [A lot of macro bugs are now fixed.][42913]
3869 - [Struct fields are now properly coerced to the expected field type.][42807]
3870 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3871 `wasm32-experimental-emscripten` target.
3872 - [Changed some of the error messages to be more helpful.][42033]
3873 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3875 - [rustc now reports the total number of errors on compilation failure][43015]
3876 previously this was only the number of errors in the pass that failed.
3877 - [Expansion in rustc has been sped up 29x.][42533]
3878 - [added `msp430-none-elf` target.][43099]
3879 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3881 - [Fixes backtraces on Redox][43228]
3882 - [rustc now identifies different versions of same crate when absolute paths of
3883 different types match in an error message.][42826]
3889 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3890 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3892 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3893 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3894 - [Impl `Clone` for `DefaultHasher`.][42799]
3895 - [Impl `Sync` for `SyncSender`.][42397]
3896 - [Impl `FromStr` for `char`][42271]
3897 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3899 - [allow messages in the `unimplemented!()` macro.][42155]
3900 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3901 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3902 - [Upgrade to Unicode 10.0.0][42999]
3903 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3904 - [Skip the main thread's manual stack guard on Linux][43072]
3905 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3906 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3908 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3913 - [`CStr::into_c_string`]
3914 - [`CString::as_c_str`]
3915 - [`CString::into_boxed_c_str`]
3916 - [`Chain::get_mut`]
3917 - [`Chain::get_ref`]
3918 - [`Chain::into_inner`]
3919 - [`Option::get_or_insert_with`]
3920 - [`Option::get_or_insert`]
3921 - [`OsStr::into_os_string`]
3922 - [`OsString::into_boxed_os_str`]
3925 - [`Utf8Error::error_len`]
3926 - [`char::EscapeDebug`]
3927 - [`char::escape_debug`]
3928 - [`compile_error!`]
3929 - [`f32::from_bits`]
3931 - [`f64::from_bits`]
3933 - [`mem::ManuallyDrop`]
3934 - [`slice::sort_unstable_by_key`]
3935 - [`slice::sort_unstable_by`]
3936 - [`slice::sort_unstable`]
3937 - [`str::from_boxed_utf8_unchecked`]
3938 - [`str::as_bytes_mut`]
3939 - [`str::as_bytes_mut`]
3940 - [`str::from_utf8_mut`]
3941 - [`str::from_utf8_unchecked_mut`]
3943 - [`str::get_unchecked_mut`]
3944 - [`str::get_unchecked`]
3946 - [`str::into_boxed_bytes`]
3951 - [Cargo API token location moved from `~/.cargo/config` to
3952 `~/.cargo/credentials`.][cargo/3978]
3953 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3954 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3955 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3956 - [You can now specify version of a binary when installed through
3957 `cargo install` using `--vers`.][cargo/4229]
3958 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3959 failure.][cargo/4248]
3960 - [Changed the convention around which file is the crate root.][cargo/4259]
3961 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3962 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3967 - [Functions with `'static` in their return types will now not be as usable as
3968 if they were using lifetime parameters instead.][42417]
3969 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3970 takes the sign of NaN into account where previously didn't.][42430]
3972 [42033]: https://github.com/rust-lang/rust/pull/42033
3973 [42155]: https://github.com/rust-lang/rust/pull/42155
3974 [42271]: https://github.com/rust-lang/rust/pull/42271
3975 [42397]: https://github.com/rust-lang/rust/pull/42397
3976 [42417]: https://github.com/rust-lang/rust/pull/42417
3977 [42430]: https://github.com/rust-lang/rust/pull/42430
3978 [42431]: https://github.com/rust-lang/rust/pull/42431
3979 [42533]: https://github.com/rust-lang/rust/pull/42533
3980 [42571]: https://github.com/rust-lang/rust/pull/42571
3981 [42613]: https://github.com/rust-lang/rust/pull/42613
3982 [42799]: https://github.com/rust-lang/rust/pull/42799
3983 [42807]: https://github.com/rust-lang/rust/pull/42807
3984 [42809]: https://github.com/rust-lang/rust/pull/42809
3985 [42822]: https://github.com/rust-lang/rust/pull/42822
3986 [42826]: https://github.com/rust-lang/rust/pull/42826
3987 [42854]: https://github.com/rust-lang/rust/pull/42854
3988 [42913]: https://github.com/rust-lang/rust/pull/42913
3989 [42999]: https://github.com/rust-lang/rust/pull/42999
3990 [43011]: https://github.com/rust-lang/rust/pull/43011
3991 [43015]: https://github.com/rust-lang/rust/pull/43015
3992 [43072]: https://github.com/rust-lang/rust/pull/43072
3993 [43077]: https://github.com/rust-lang/rust/pull/43077
3994 [43097]: https://github.com/rust-lang/rust/pull/43097
3995 [43099]: https://github.com/rust-lang/rust/pull/43099
3996 [43170]: https://github.com/rust-lang/rust/pull/43170
3997 [43178]: https://github.com/rust-lang/rust/pull/43178
3998 [43185]: https://github.com/rust-lang/rust/pull/43185
3999 [43228]: https://github.com/rust-lang/rust/pull/43228
4000 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
4001 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
4002 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
4003 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
4004 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
4005 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
4006 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
4007 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4008 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4009 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4010 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4011 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4012 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4013 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4014 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4015 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4016 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4017 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4018 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4019 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4020 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4021 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4022 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4023 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4024 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4025 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4026 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4027 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4028 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4029 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4030 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4031 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4032 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4033 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4034 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4035 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4036 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4037 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4038 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4041 Version 1.19.0 (2017-07-20)
4042 ===========================
4047 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4048 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4049 - [Macro recursion limit increased to 1024 from 64.][41676]
4050 - [Added lint for detecting unused macros.][41907]
4051 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4052 For example: `let x = loop { break 7; };`
4053 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4054 contain `Copy` types and cannot have a `Drop` implementation.
4055 Example: `union Foo { bar: u8, baz: usize }`
4056 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4057 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4062 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4063 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4064 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4065 you should use `--target armv7-linux-androideabi`.
4066 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4067 - [Minor optimisation of string operations.][42037]
4068 - [Compiler error message is now `aborting due to previous error(s)` instead of
4069 `aborting due to N previous errors`][42150] This was previously inaccurate and
4070 would only count certain kinds of errors.
4071 - [The compiler now supports Visual Studio 2017][42225]
4072 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4073 - [Added a lot][42264] of [new error codes][42302]
4074 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4075 libraries with C Run-time Libraries(CRT) to be statically linked.
4076 - [Fixed various ARM codegen bugs][42740]
4081 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4082 `Extend<Cow<'a, str>>`][41449]
4083 - [`Vec` now implements `From<&mut [T]>`][41530]
4084 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4085 - [`SplitWhitespace` now implements `Clone`][41659]
4086 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4088 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4089 macros, but for printing to stderr.
4094 - [`OsString::shrink_to_fit`]
4097 - [`thread::ThreadId`]
4102 - [Build scripts can now add environment variables to the environment
4103 the crate is being compiled in.
4104 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4105 - [Subcommands now replace the current process rather than spawning a new
4106 child process][cargo/3970]
4107 - [Workspace members can now accept glob file patterns][cargo/3979]
4108 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4109 the members in a given workspace.][cargo/3988]
4110 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4111 - [Target directory path is now in the cargo metadata][cargo/4022]
4112 - [Cargo no longer checks out a local working directory for the
4113 crates.io index][cargo/4026] This should provide smaller file size for the
4114 registry, and improve cloning times, especially on Windows machines.
4115 - [Added an `--exclude` option for excluding certain packages when using the
4116 `--all` option][cargo/4031]
4117 - [Cargo will now automatically retry when receiving a 5xx error
4118 from crates.io][cargo/4032]
4119 - [The `--features` option now accepts multiple comma or space
4120 delimited values.][cargo/4084]
4121 - [Added support for custom target specific runners][cargo/3954]
4126 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4128 - [Rust will now release XZ compressed packages][rust-installer/57]
4129 - [rustup will now prefer to download rust packages with
4130 XZ compression][rustup/1100] over GZip packages.
4131 - [Added the ability to escape `#` in rust documentation][41785] By adding
4132 additional `#`'s ie. `##` is now `#`
4137 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4138 - [`-Z` flags are now no longer allowed to be used on the stable
4139 compiler.][41751] This has been a warning for a year previous to this.
4140 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4141 longer works][42844]. Users should migrate to the built-in `check`
4142 command, which has been available since 1.16.
4143 - [Ending a float literal with `._` is now a hard error.
4144 Example: `42._` .][41946]
4145 - [Any use of a private `extern crate` outside of its module is now a
4146 hard error.][36886] This was previously a warning.
4147 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4148 relative while the `::` prefix makes a path absolute, but was ignored and the
4149 path was relative regardless.
4150 - [Floating point constants in match patterns is now a hard error][36890]
4151 This was previously a warning.
4152 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4153 match patterns is now a hard error][36891] This was previously a warning.
4154 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4156 - [From the pound escape, lines consisting of multiple `#`s are
4158 - [It is an error to re-export private enum variants][42460]. This is
4159 known to break a number of crates that depend on an older version of
4161 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4162 to use it to find the linker, and the build will fail where it did
4163 not previously][42607]
4165 [36886]: https://github.com/rust-lang/rust/issues/36886
4166 [36888]: https://github.com/rust-lang/rust/issues/36888
4167 [36890]: https://github.com/rust-lang/rust/issues/36890
4168 [36891]: https://github.com/rust-lang/rust/issues/36891
4169 [36892]: https://github.com/rust-lang/rust/issues/36892
4170 [37406]: https://github.com/rust-lang/rust/issues/37406
4171 [39983]: https://github.com/rust-lang/rust/pull/39983
4172 [41145]: https://github.com/rust-lang/rust/pull/41145
4173 [41192]: https://github.com/rust-lang/rust/pull/41192
4174 [41258]: https://github.com/rust-lang/rust/pull/41258
4175 [41370]: https://github.com/rust-lang/rust/pull/41370
4176 [41449]: https://github.com/rust-lang/rust/pull/41449
4177 [41530]: https://github.com/rust-lang/rust/pull/41530
4178 [41624]: https://github.com/rust-lang/rust/pull/41624
4179 [41656]: https://github.com/rust-lang/rust/pull/41656
4180 [41659]: https://github.com/rust-lang/rust/pull/41659
4181 [41676]: https://github.com/rust-lang/rust/pull/41676
4182 [41751]: https://github.com/rust-lang/rust/pull/41751
4183 [41764]: https://github.com/rust-lang/rust/pull/41764
4184 [41785]: https://github.com/rust-lang/rust/pull/41785
4185 [41873]: https://github.com/rust-lang/rust/pull/41873
4186 [41907]: https://github.com/rust-lang/rust/pull/41907
4187 [41946]: https://github.com/rust-lang/rust/pull/41946
4188 [42016]: https://github.com/rust-lang/rust/pull/42016
4189 [42037]: https://github.com/rust-lang/rust/pull/42037
4190 [42068]: https://github.com/rust-lang/rust/pull/42068
4191 [42150]: https://github.com/rust-lang/rust/pull/42150
4192 [42162]: https://github.com/rust-lang/rust/pull/42162
4193 [42225]: https://github.com/rust-lang/rust/pull/42225
4194 [42264]: https://github.com/rust-lang/rust/pull/42264
4195 [42302]: https://github.com/rust-lang/rust/pull/42302
4196 [42460]: https://github.com/rust-lang/rust/issues/42460
4197 [42607]: https://github.com/rust-lang/rust/issues/42607
4198 [42740]: https://github.com/rust-lang/rust/pull/42740
4199 [42844]: https://github.com/rust-lang/rust/issues/42844
4200 [42948]: https://github.com/rust-lang/rust/pull/42948
4201 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4202 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4203 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4204 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4205 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4206 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4207 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4208 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4209 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4210 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4211 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4212 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4213 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4214 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4215 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4216 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4217 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4218 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4219 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4220 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4221 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4222 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4225 Version 1.18.0 (2017-06-08)
4226 ===========================
4231 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4232 make the item visible to just that module tree. Also accepts the keyword
4233 `crate` to make something public to the whole crate but not users of the
4234 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4235 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4236 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4237 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4238 types like `Write + Send`, trailing `+` are now supported in trait objects,
4239 and better error reporting for trait objects starting with `?Sized`.
4240 - [0e+10 is now a valid floating point literal][40589]
4241 - [Now warns if you bind a lifetime parameter to 'static][40734]
4242 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4243 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4244 representation in some cases.][40377]
4249 - [rustc can now emit mir with `--emit mir`][39891]
4250 - [Improved LLVM IR for trivial functions][40367]
4251 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4252 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4253 opportunities found through profiling
4254 - [Improved backtrace formatting when panicking][38165]
4259 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4260 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4261 iteration or reallocation.
4262 - [Simplified HashMap Bucket interface][40561] provides performance
4263 improvements for iterating and cloning.
4264 - [Specialize Vec::from_elem to use calloc][40409]
4265 - [Fixed Race condition in fs::create_dir_all][39799]
4266 - [No longer caching stdio on Windows][40516]
4267 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4268 2.50%~ faster and in one case now 12.50% faster.
4269 - [Optimized `AtomicBool::fetch_nand`][41143]
4274 - [`Child::try_wait`]
4275 - [`HashMap::retain`]
4276 - [`HashSet::retain`]
4278 - [`TcpStream::peek`]
4279 - [`UdpSocket::peek`]
4280 - [`UdpSocket::peek_from`]
4285 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4286 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4287 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4288 - [Added Android build support][cargo/3885]
4289 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4290 of a certain type, for example `cargo build --bins` will build all
4292 - [Added support for haiku][cargo/3952]
4297 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4298 - [Added rust-windbg script for better debugging on Windows][39983]
4299 - [Rust now uses the official cross compiler for NetBSD][40612]
4300 - [rustdoc now accepts `#` at the start of files][40828]
4301 - [Fixed jemalloc support for musl][41168]
4306 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4307 always placed after the sign if it exists and before the digits. With the `#`
4308 flag the zeroes are placed after the prefix and before the digits.
4309 - [Due to the struct field optimisation][40377], using `transmute` on structs
4310 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4311 always been undefined behavior, but is now more likely to break in practice.
4312 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4313 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4314 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4315 - [Overlapping inherent `impl`s are now a hard error][40728]
4316 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4317 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4318 `out.asm` and `out.ll` instead of only one of the filetypes.
4319 - [ calling a function that returns `Self` will no longer work][41805] when
4320 the size of `Self` cannot be statically determined.
4321 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4322 this has caused a few regressions namely:
4324 - Changed the link order of local static/dynamic libraries (respecting the
4325 order on given rather than having the compiler reorder).
4326 - Changed how MinGW is linked, native code linked to dynamic libraries
4327 may require manually linking to the gcc support library (for the native
4330 [38165]: https://github.com/rust-lang/rust/pull/38165
4331 [39799]: https://github.com/rust-lang/rust/pull/39799
4332 [39891]: https://github.com/rust-lang/rust/pull/39891
4333 [39983]: https://github.com/rust-lang/rust/pull/39983
4334 [40043]: https://github.com/rust-lang/rust/pull/40043
4335 [40241]: https://github.com/rust-lang/rust/pull/40241
4336 [40338]: https://github.com/rust-lang/rust/pull/40338
4337 [40367]: https://github.com/rust-lang/rust/pull/40367
4338 [40377]: https://github.com/rust-lang/rust/pull/40377
4339 [40409]: https://github.com/rust-lang/rust/pull/40409
4340 [40516]: https://github.com/rust-lang/rust/pull/40516
4341 [40556]: https://github.com/rust-lang/rust/pull/40556
4342 [40561]: https://github.com/rust-lang/rust/pull/40561
4343 [40589]: https://github.com/rust-lang/rust/pull/40589
4344 [40612]: https://github.com/rust-lang/rust/pull/40612
4345 [40723]: https://github.com/rust-lang/rust/pull/40723
4346 [40728]: https://github.com/rust-lang/rust/pull/40728
4347 [40731]: https://github.com/rust-lang/rust/pull/40731
4348 [40734]: https://github.com/rust-lang/rust/pull/40734
4349 [40805]: https://github.com/rust-lang/rust/pull/40805
4350 [40807]: https://github.com/rust-lang/rust/pull/40807
4351 [40828]: https://github.com/rust-lang/rust/pull/40828
4352 [40870]: https://github.com/rust-lang/rust/pull/40870
4353 [41085]: https://github.com/rust-lang/rust/pull/41085
4354 [41143]: https://github.com/rust-lang/rust/pull/41143
4355 [41168]: https://github.com/rust-lang/rust/pull/41168
4356 [41270]: https://github.com/rust-lang/rust/issues/41270
4357 [41469]: https://github.com/rust-lang/rust/pull/41469
4358 [41805]: https://github.com/rust-lang/rust/issues/41805
4359 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4360 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4361 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4362 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4363 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4364 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4365 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4366 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4367 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4368 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4369 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4370 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4371 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4372 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4375 Version 1.17.0 (2017-04-27)
4376 ===========================
4381 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4382 * [Fields of structs may be initialized without duplicating the field/variable
4383 names][39761]. [RFC 1682]
4384 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4385 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4386 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4387 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4388 `'b`. Soundness fix.
4389 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4390 * [Static variables may contain references to other statics][40027]
4395 * [Exit quickly on only `--emit dep-info`][40336]
4396 * [Make `-C relocation-model` more correctly determine whether the linker
4397 creates a position-independent executable][40245]
4398 * [Add `-C overflow-checks` to directly control whether integer overflow
4400 * [The rustc type checker now checks items on demand instead of in a single
4401 in-order pass][40008]. This is mostly an internal refactoring in support of
4402 future work, including incremental type checking, but also resolves [RFC
4403 1647], allowing `Self` to appear in `impl` `where` clauses.
4404 * [Optimize vtable loads][39995]
4405 * [Turn off vectorization for Emscripten targets][39990]
4406 * [Provide suggestions for unknown macros imported with `use`][39953]
4407 * [Fix ICEs in path resolution][39939]
4408 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4409 * [Add clearer error message using `&str + &str`][39116]
4420 * [`Ordering::then`]
4421 * [`Ordering::then_with`]
4422 * [`BTreeMap::range`]
4423 * [`BTreeMap::range_mut`]
4424 * [`collections::Bound`]
4425 * [`process::abort`]
4426 * [`ptr::read_unaligned`]
4427 * [`ptr::write_unaligned`]
4428 * [`Result::expect_err`]
4431 * [`Cell::into_inner`]
4437 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4438 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4439 * [`String` implements `FromIterator<&char>`][40028]
4440 * `Box` [implements][40009] a number of new conversions:
4441 `From<Box<str>> for String`,
4442 `From<Box<[T]>> for Vec<T>`,
4443 `From<Box<CStr>> for CString`,
4444 `From<Box<OsStr>> for OsString`,
4445 `From<Box<Path>> for PathBuf`,
4446 `Into<Box<str>> for String`,
4447 `Into<Box<[T]>> for Vec<T>`,
4448 `Into<Box<CStr>> for CString`,
4449 `Into<Box<OsStr>> for OsString`,
4450 `Into<Box<Path>> for PathBuf`,
4451 `Default for Box<str>`,
4452 `Default for Box<CStr>`,
4453 `Default for Box<OsStr>`,
4454 `From<&CStr> for Box<CStr>`,
4455 `From<&OsStr> for Box<OsStr>`,
4456 `From<&Path> for Box<Path>`
4457 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4458 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4459 * [Slightly optimize `slice::sort`][39538]
4460 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4461 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4462 `Box<str>` implements `From<&str>`][39438]
4463 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4464 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4465 * [`format!` estimates the needed capacity before writing a string][39356]
4466 * [Support unprivileged symlink creation in Windows][38921]
4467 * [`PathBuf` implements `Default`][38764]
4468 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4469 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4470 and poor hash functions.
4475 * [Add `cargo check --all`][cargo/3731]
4476 * [Add an option to ignore SSL revocation checking][cargo/3699]
4477 * [Add `cargo run --package`][cargo/3691]
4478 * [Add `required_features`][cargo/3667]
4479 * [Assume `build.rs` is a build script][cargo/3664]
4480 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4485 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4487 * [The "Unstable Book" documents nightly-only features][ubook]
4488 * [Improve the style of the sidebar in rustdoc output][40265]
4489 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4490 * [Fix MSP430 breakage due to `i128`][40257]
4491 * [Preliminary Solaris/SPARCv9 support][39903]
4492 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4493 run without installing the MSVC runtime.
4494 * [`rustdoc --test` includes file names in test names][39788]
4495 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4496 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4497 * [Initial support for `aarch64-unknown-freebsd`][39491]
4498 * [Initial support for `i686-unknown-netbsd`][39426]
4499 * [This release no longer includes the old makefile build system][39431]. Rust
4500 is built with a custom build system, written in Rust, and with Cargo.
4501 * [Add Debug implementations for libcollection structs][39002]
4502 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4503 * [`--test-threads=0` produces an error][38945]
4504 * [`rustup` installs documentation by default][40526]
4505 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4506 WinDbg and Visual Studio to improve the debugging experience.
4511 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4512 workaround, either use MSVC 2015 or run vcvars.bat.
4513 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4514 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4515 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4517 * [`format!` and `Display::to_string` panic if an underlying formatting
4518 implementation returns an error][40117]. Previously the error was silently
4519 ignored. It is incorrect for `write_fmt` to return an error when writing
4521 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4522 crates were marked stable and could be accessed from the stable toolchain.
4523 * [Rust git source no longer includes vendored crates][39728]. Those that need
4524 to build with vendored crates should build from release tarballs.
4525 * [Fix inert attributes from `proc_macro_derives`][39572]
4526 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4527 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4529 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4530 existing code generally ignores the type of dead-code unless a type-hint is
4531 provided; this can cause surprising inference interactions particularly around
4532 defaulting. The new code uniformly ignores the result type of dead-code.
4533 * [Tuple-struct constructors with private fields are no longer visible][38932]
4534 * [Lifetime parameters that do not appear in the arguments are now considered
4535 early-bound][38897], resolving a soundness bug (#[32330]). The
4536 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4538 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4539 * [Make transmuting from fn item types to pointer-sized types a hard
4542 [27787]: https://github.com/rust-lang/rust/issues/27787
4543 [32330]: https://github.com/rust-lang/rust/issues/32330
4544 [34198]: https://github.com/rust-lang/rust/pull/34198
4545 [38161]: https://github.com/rust-lang/rust/pull/38161
4546 [38368]: https://github.com/rust-lang/rust/pull/38368
4547 [38584]: https://github.com/rust-lang/rust/issues/38584
4548 [38661]: https://github.com/rust-lang/rust/pull/38661
4549 [38764]: https://github.com/rust-lang/rust/pull/38764
4550 [38864]: https://github.com/rust-lang/rust/issues/38864
4551 [38897]: https://github.com/rust-lang/rust/pull/38897
4552 [38921]: https://github.com/rust-lang/rust/pull/38921
4553 [38932]: https://github.com/rust-lang/rust/pull/38932
4554 [38945]: https://github.com/rust-lang/rust/pull/38945
4555 [38981]: https://github.com/rust-lang/rust/pull/38981
4556 [39002]: https://github.com/rust-lang/rust/pull/39002
4557 [39116]: https://github.com/rust-lang/rust/pull/39116
4558 [39193]: https://github.com/rust-lang/rust/pull/39193
4559 [39265]: https://github.com/rust-lang/rust/pull/39265
4560 [39356]: https://github.com/rust-lang/rust/pull/39356
4561 [39372]: https://github.com/rust-lang/rust/pull/39372
4562 [39426]: https://github.com/rust-lang/rust/pull/39426
4563 [39431]: https://github.com/rust-lang/rust/pull/39431
4564 [39438]: https://github.com/rust-lang/rust/pull/39438
4565 [39440]: https://github.com/rust-lang/rust/pull/39440
4566 [39485]: https://github.com/rust-lang/rust/pull/39485
4567 [39491]: https://github.com/rust-lang/rust/pull/39491
4568 [39518]: https://github.com/rust-lang/rust/pull/39518
4569 [39538]: https://github.com/rust-lang/rust/pull/39538
4570 [39572]: https://github.com/rust-lang/rust/pull/39572
4571 [39633]: https://github.com/rust-lang/rust/pull/39633
4572 [39642]: https://github.com/rust-lang/rust/pull/39642
4573 [39728]: https://github.com/rust-lang/rust/pull/39728
4574 [39761]: https://github.com/rust-lang/rust/pull/39761
4575 [39788]: https://github.com/rust-lang/rust/pull/39788
4576 [39793]: https://github.com/rust-lang/rust/pull/39793
4577 [39837]: https://github.com/rust-lang/rust/pull/39837
4578 [39843]: https://github.com/rust-lang/rust/pull/39843
4579 [39851]: https://github.com/rust-lang/rust/pull/39851
4580 [39903]: https://github.com/rust-lang/rust/pull/39903
4581 [39939]: https://github.com/rust-lang/rust/pull/39939
4582 [39953]: https://github.com/rust-lang/rust/pull/39953
4583 [39960]: https://github.com/rust-lang/rust/pull/39960
4584 [39990]: https://github.com/rust-lang/rust/pull/39990
4585 [39995]: https://github.com/rust-lang/rust/pull/39995
4586 [40008]: https://github.com/rust-lang/rust/pull/40008
4587 [40009]: https://github.com/rust-lang/rust/pull/40009
4588 [40027]: https://github.com/rust-lang/rust/pull/40027
4589 [40028]: https://github.com/rust-lang/rust/pull/40028
4590 [40037]: https://github.com/rust-lang/rust/pull/40037
4591 [40117]: https://github.com/rust-lang/rust/pull/40117
4592 [40166]: https://github.com/rust-lang/rust/pull/40166
4593 [40245]: https://github.com/rust-lang/rust/pull/40245
4594 [40257]: https://github.com/rust-lang/rust/pull/40257
4595 [40261]: https://github.com/rust-lang/rust/pull/40261
4596 [40265]: https://github.com/rust-lang/rust/pull/40265
4597 [40319]: https://github.com/rust-lang/rust/pull/40319
4598 [40336]: https://github.com/rust-lang/rust/pull/40336
4599 [40526]: https://github.com/rust-lang/rust/pull/40526
4600 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4601 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4602 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4603 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4604 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4605 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4606 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4607 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4608 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4609 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4610 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4611 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4612 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4613 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4614 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4615 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4616 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4617 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4618 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4619 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4620 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4621 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4622 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4623 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4624 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4625 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4626 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4627 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4628 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4629 [mdbook]: https://crates.io/crates/mdbook
4630 [ubook]: https://doc.rust-lang.org/unstable-book/
4633 Version 1.16.0 (2017-03-16)
4634 ===========================
4639 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4640 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4641 match patterns][38069]
4642 * [Clean up semantics of `self` in an import list][38313]
4643 * [`Self` may appear in `impl` headers][38920]
4644 * [`Self` may appear in struct expressions][39282]
4649 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4650 a `.rmeta` file containing only crate metadata][38571]. This can be
4651 used by tools like the Rust Language Service to perform
4652 metadata-only builds.
4653 * [Levenshtein based typo suggestions now work in most places, while
4654 previously they worked only for fields and sometimes for local
4655 variables][38927]. Together with the overhaul of "no
4656 resolution"/"unexpected resolution" errors (#[38154]) they result in
4657 large and systematic improvement in resolution diagnostics.
4658 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4660 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4661 * [`rustc` no longer attempts to provide "consider using an explicit
4662 lifetime" suggestions][37057]. They were inaccurate.
4667 * [`VecDeque::truncate`]
4668 * [`VecDeque::resize`]
4669 * [`String::insert_str`]
4670 * [`Duration::checked_add`]
4671 * [`Duration::checked_sub`]
4672 * [`Duration::checked_div`]
4673 * [`Duration::checked_mul`]
4676 * [`SocketAddr::is_ipv4`]
4677 * [`SocketAddr::is_ipv6`]
4678 * [`IpAddr::is_ipv4`]
4679 * [`IpAddr::is_ipv6`]
4681 * [`Vec::dedup_by_key`]
4682 * [`Result::unwrap_or_default`]
4683 * [`<*const T>::wrapping_offset`]
4684 * [`<*mut T>::wrapping_offset`]
4685 * `CommandExt::creation_flags`
4686 * [`File::set_permissions`]
4687 * [`String::split_off`]
4692 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4693 their argument by `Borrow` parameter][37761]
4694 * [All public types in std implement `Debug`][38006]
4695 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4696 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4697 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4699 * [std: Fix partial writes in `LineWriter`][38062]
4700 * [std: Clamp max read/write sizes on Unix][38062]
4701 * [Use more specific panic message for `&str` slicing errors][38066]
4702 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4703 functionality cannot be achieved in std currently.
4704 * [`writeln!`, like `println!`, now accepts a form with no string
4705 or formatting arguments, to just print a newline][38469]
4706 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4707 * [Reduce the size of static data in `std_unicode::tables`][38781]
4708 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4709 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4711 * [`Duration` implements `Sum`][38712]
4712 * [`String` implements `ToSocketAddrs`][39048]
4717 * [The `cargo check` command does a type check of a project without
4718 building it][cargo/3296]
4719 * [crates.io will display CI badges from Travis and AppVeyor, if
4720 specified in Cargo.toml][cargo/3546]
4721 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4722 * [Compilation profiles accept integer values for `debug`, in addition
4723 to `true` and `false`. These are passed to `rustc` as the value to
4724 `-C debuginfo`][cargo/3534]
4725 * [Implement `cargo --version --verbose`][cargo/3604]
4726 * [All builds now output 'dep-info' build dependencies compatible with
4727 make and ninja][cargo/3557]
4728 * [Build all workspace members with `build --all`][cargo/3511]
4729 * [Document all workspace members with `doc --all`][cargo/3515]
4730 * [Path deps outside workspace are not members][cargo/3443]
4735 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4736 the path to the Rust implementation][38589]
4737 * [The `armv7-linux-androideabi` target no longer enables NEON
4738 extensions, per Google's ABI guide][38413]
4739 * [The stock standard library can be compiled for Redox OS][38401]
4740 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4742 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4744 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4749 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4750 match patterns][38069]
4751 * In this release, references to uninhabited types can not be
4752 pattern-matched. This was accidentally allowed in 1.15.
4753 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4754 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4756 * [Clean up semantics of `self` in an import list][38313]
4757 * Reimplemented lifetime elision. This change was almost entirely compatible
4758 with existing code, but it did close a number of small bugs and loopholes,
4759 as well as being more accepting in some other [cases][41105].
4761 [37057]: https://github.com/rust-lang/rust/pull/37057
4762 [37761]: https://github.com/rust-lang/rust/pull/37761
4763 [38006]: https://github.com/rust-lang/rust/pull/38006
4764 [38051]: https://github.com/rust-lang/rust/pull/38051
4765 [38062]: https://github.com/rust-lang/rust/pull/38062
4766 [38062]: https://github.com/rust-lang/rust/pull/38622
4767 [38066]: https://github.com/rust-lang/rust/pull/38066
4768 [38069]: https://github.com/rust-lang/rust/pull/38069
4769 [38131]: https://github.com/rust-lang/rust/pull/38131
4770 [38154]: https://github.com/rust-lang/rust/pull/38154
4771 [38274]: https://github.com/rust-lang/rust/pull/38274
4772 [38304]: https://github.com/rust-lang/rust/pull/38304
4773 [38313]: https://github.com/rust-lang/rust/pull/38313
4774 [38314]: https://github.com/rust-lang/rust/pull/38314
4775 [38327]: https://github.com/rust-lang/rust/pull/38327
4776 [38401]: https://github.com/rust-lang/rust/pull/38401
4777 [38413]: https://github.com/rust-lang/rust/pull/38413
4778 [38469]: https://github.com/rust-lang/rust/pull/38469
4779 [38559]: https://github.com/rust-lang/rust/pull/38559
4780 [38571]: https://github.com/rust-lang/rust/pull/38571
4781 [38580]: https://github.com/rust-lang/rust/pull/38580
4782 [38589]: https://github.com/rust-lang/rust/pull/38589
4783 [38670]: https://github.com/rust-lang/rust/pull/38670
4784 [38712]: https://github.com/rust-lang/rust/pull/38712
4785 [38726]: https://github.com/rust-lang/rust/pull/38726
4786 [38781]: https://github.com/rust-lang/rust/pull/38781
4787 [38798]: https://github.com/rust-lang/rust/pull/38798
4788 [38909]: https://github.com/rust-lang/rust/pull/38909
4789 [38920]: https://github.com/rust-lang/rust/pull/38920
4790 [38927]: https://github.com/rust-lang/rust/pull/38927
4791 [39048]: https://github.com/rust-lang/rust/pull/39048
4792 [39282]: https://github.com/rust-lang/rust/pull/39282
4793 [39379]: https://github.com/rust-lang/rust/pull/39379
4794 [41105]: https://github.com/rust-lang/rust/issues/41105
4795 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4796 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4797 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4798 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4799 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4800 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4801 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4802 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4803 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4804 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4805 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4806 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4807 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4808 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4809 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4810 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4811 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4812 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4813 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4814 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4815 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4816 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4817 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4818 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4819 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4820 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4821 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4822 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4823 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4824 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4827 Version 1.15.1 (2017-02-09)
4828 ===========================
4830 * [Fix IntoIter::as_mut_slice's signature][39466]
4831 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4833 [39466]: https://github.com/rust-lang/rust/pull/39466
4834 [39523]: https://github.com/rust-lang/rust/pull/39523
4837 Version 1.15.0 (2017-02-02)
4838 ===========================
4843 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4844 stable. This allows popular code-generating crates like Serde and Diesel to
4845 work ergonomically. [RFC 1681].
4846 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4847 with curly braces][36868]. Part of [RFC 1506].
4848 * [A number of minor changes to name resolution have been activated][37127].
4849 They add up to more consistent semantics, allowing for future evolution of
4850 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4851 details of what is different. The breaking changes here have been transitioned
4852 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4853 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4855 * [`?Sized` can be used in `where` clauses][37791]
4856 * [There is now a limit on the size of monomorphized types and it can be
4857 modified with the `#![type_size_limit]` crate attribute, similarly to
4858 the `#![recursion_limit]` attribute][37789]
4863 * [On Windows, the compiler will apply dllimport attributes when linking to
4864 extern functions][37973]. Additional attributes and flags can control which
4865 library kind is linked and its name. [RFC 1717].
4866 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4867 * [The `--test` flag works with procedural macro crates][38107]
4868 * [Fix `extern "aapcs" fn` ABI][37814]
4869 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4870 * [The `format!` expander recognizes incorrect `printf` and shell-style
4871 formatting directives and suggests the correct format][37613].
4872 * [Only report one error for all unused imports in an import list][37456]
4874 Compiler Performance
4875 --------------------
4877 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4878 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4879 * [Don't clone in `UnificationTable::probe`][37848]
4880 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4881 * [Use small vectors in type walker][37760]
4882 * [Macro expansion performance was improved][37701]
4883 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4884 * [Replace FNV with a faster hash function][37229]
4889 * [`std::iter::Iterator::min_by`]
4890 * [`std::iter::Iterator::max_by`]
4891 * [`std::os::*::fs::FileExt`]
4892 * [`std::sync::atomic::Atomic*::get_mut`]
4893 * [`std::sync::atomic::Atomic*::into_inner`]
4894 * [`std::vec::IntoIter::as_slice`]
4895 * [`std::vec::IntoIter::as_mut_slice`]
4896 * [`std::sync::mpsc::Receiver::try_iter`]
4897 * [`std::os::unix::process::CommandExt::before_exec`]
4898 * [`std::rc::Rc::strong_count`]
4899 * [`std::rc::Rc::weak_count`]
4900 * [`std::sync::Arc::strong_count`]
4901 * [`std::sync::Arc::weak_count`]
4902 * [`std::char::encode_utf8`]
4903 * [`std::char::encode_utf16`]
4904 * [`std::cell::Ref::clone`]
4905 * [`std::io::Take::into_inner`]
4910 * [The standard sorting algorithm has been rewritten for dramatic performance
4911 improvements][38192]. It is a hybrid merge sort, drawing influences from
4912 Timsort. Previously it was a naive merge sort.
4913 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4914 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4916 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4917 and `char_indices().last()`][37882]
4918 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4919 * [Chinese characters display correctly in `fmt::Debug`][37855]
4920 * [Derive `Default` for `Duration`][37699]
4921 * [Support creation of anonymous pipes on WinXP/2k][37677]
4922 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4923 * [Don't pass overlapped handles to processes][38835]
4928 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4929 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4930 should instead check the variable at runtime with `std::env`. That the value
4931 was set at build time was a bug, and incorrect when cross-compiling. This
4932 change is known to cause breakage.
4933 * [Add `--all` flag to `cargo test`][cargo/3221]
4934 * [Compile statically against the MSVC CRT][cargo/3363]
4935 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4936 * [Link OpenSSL statically on OSX][cargo/3311]
4937 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4938 * [Test for bad path overrides with summaries][cargo/3336]
4939 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4940 * [Fix retrying crate downloads for network errors][cargo/3348]
4941 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4942 * [Emit more info on --message-format=json][cargo/3319]
4943 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4944 * [Don't ignore errors in workspace manifest][cargo/3409]
4945 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4950 * [Test runners (binaries built with `--test`) now support a `--list` argument
4951 that lists the tests it contains][38185]
4952 * [Test runners now support a `--exact` argument that makes the test filter
4953 match exactly, instead of matching only a substring of the test name][38181]
4954 * [rustdoc supports a `--playground-url` flag][37763]
4955 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4960 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4961 continue to be used in this release by passing `--disable-rustbuild` to the
4962 configure script, but they will be deleted soon. Note that the new build
4963 system uses a different on-disk layout that will likely affect any scripts
4965 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4967 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4968 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4974 * [A number of minor changes to name resolution have been activated][37127].
4975 They add up to more consistent semantics, allowing for future evolution of
4976 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4977 details of what is different. The breaking changes here have been transitioned
4978 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4979 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4980 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4981 should instead check the variable at runtime with `std::env`. That the value
4982 was set at build time was a bug, and incorrect when cross-compiling. This
4983 change is known to cause breakage.
4984 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4985 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4986 1.10 and is now an error by default. It will become a hard error in the near
4988 * [The semantics relating modules to file system directories are changing in
4989 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4990 lint, which is a warning in this release, and will become a hard error in the
4992 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4993 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4994 the underlying iterator][37834]
4996 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4997 [33685]: https://github.com/rust-lang/rust/issues/33685
4998 [36868]: https://github.com/rust-lang/rust/pull/36868
4999 [37127]: https://github.com/rust-lang/rust/pull/37127
5000 [37229]: https://github.com/rust-lang/rust/pull/37229
5001 [37456]: https://github.com/rust-lang/rust/pull/37456
5002 [37527]: https://github.com/rust-lang/rust/pull/37527
5003 [37602]: https://github.com/rust-lang/rust/pull/37602
5004 [37613]: https://github.com/rust-lang/rust/pull/37613
5005 [37615]: https://github.com/rust-lang/rust/pull/37615
5006 [37636]: https://github.com/rust-lang/rust/pull/37636
5007 [37627]: https://github.com/rust-lang/rust/pull/37627
5008 [37642]: https://github.com/rust-lang/rust/pull/37642
5009 [37677]: https://github.com/rust-lang/rust/pull/37677
5010 [37699]: https://github.com/rust-lang/rust/pull/37699
5011 [37701]: https://github.com/rust-lang/rust/pull/37701
5012 [37705]: https://github.com/rust-lang/rust/pull/37705
5013 [37749]: https://github.com/rust-lang/rust/pull/37749
5014 [37760]: https://github.com/rust-lang/rust/pull/37760
5015 [37763]: https://github.com/rust-lang/rust/pull/37763
5016 [37764]: https://github.com/rust-lang/rust/pull/37764
5017 [37789]: https://github.com/rust-lang/rust/pull/37789
5018 [37791]: https://github.com/rust-lang/rust/pull/37791
5019 [37814]: https://github.com/rust-lang/rust/pull/37814
5020 [37817]: https://github.com/rust-lang/rust/pull/37817
5021 [37834]: https://github.com/rust-lang/rust/pull/37834
5022 [37848]: https://github.com/rust-lang/rust/pull/37848
5023 [37855]: https://github.com/rust-lang/rust/pull/37855
5024 [37882]: https://github.com/rust-lang/rust/pull/37882
5025 [37888]: https://github.com/rust-lang/rust/pull/37888
5026 [37973]: https://github.com/rust-lang/rust/pull/37973
5027 [37979]: https://github.com/rust-lang/rust/pull/37979
5028 [38086]: https://github.com/rust-lang/rust/pull/38086
5029 [38107]: https://github.com/rust-lang/rust/pull/38107
5030 [38117]: https://github.com/rust-lang/rust/pull/38117
5031 [38134]: https://github.com/rust-lang/rust/pull/38134
5032 [38146]: https://github.com/rust-lang/rust/pull/38146
5033 [38181]: https://github.com/rust-lang/rust/pull/38181
5034 [38182]: https://github.com/rust-lang/rust/pull/38182
5035 [38185]: https://github.com/rust-lang/rust/pull/38185
5036 [38192]: https://github.com/rust-lang/rust/pull/38192
5037 [38279]: https://github.com/rust-lang/rust/pull/38279
5038 [38835]: https://github.com/rust-lang/rust/pull/38835
5039 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5040 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5041 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5042 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5043 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5044 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5045 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5046 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5047 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5048 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5049 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5050 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5051 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5052 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5053 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5054 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5055 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5056 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5057 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5058 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5059 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5060 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5061 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5062 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5063 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5064 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5065 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5066 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5067 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5068 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5069 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5070 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5071 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5072 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5073 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5074 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5075 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5076 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5079 Version 1.14.0 (2016-12-22)
5080 ===========================
5085 * [`..` matches multiple tuple fields in enum variants, structs
5086 and tuples][36843]. [RFC 1492].
5087 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5088 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5089 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5090 dereferencing][36822]
5095 * [Mark enums with non-zero discriminant as non-zero][37224]
5096 * [Lower-case `static mut` names are linted like other
5097 statics and consts][37162]
5098 * [Fix ICE on some macros in const integer positions
5099 (e.g. `[u8; m!()]`)][36819]
5100 * [Improve error message and snippet for "did you mean `x`"][36798]
5101 * [Add a panic-strategy field to the target specification][36794]
5102 * [Include LLVM version in `--version --verbose`][37200]
5104 Compile-time Optimizations
5105 --------------------------
5107 * [Improve macro expansion performance][37569]
5108 * [Shrink `Expr_::ExprInlineAsm`][37445]
5109 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5110 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5111 * [Avoid more allocations when compiling html5ever][37373]
5112 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5113 * [Avoid some allocations in the macro parser][37318]
5114 * [Use a faster deflate setting][37298]
5115 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5116 during interning of slices][37270]
5117 * [Optimize `write_metadata`][37267]
5118 * [Don't process obligation forest cycles when stalled][37231]
5119 * [Avoid many `CrateConfig` clones][37161]
5120 * [Optimize `Substs::super_fold_with`][37108]
5121 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5122 * [Speed up `plug_leaks`][36917]
5127 * [`println!()`, with no arguments, prints newline][36825].
5128 Previously, an empty string was required to achieve the same.
5129 * [`Wrapping` impls standard binary and unary operators, as well as
5130 the `Sum` and `Product` iterators][37356]
5131 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5133 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5134 `VecDeque` iterators][37315]
5135 * [Improve `SipHasher` performance on small values][37312]
5136 * [Add Iterator trait TrustedLen to enable better FromIterator /
5138 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5139 * [`ReadDir` implements `Debug`][37221]
5140 * [Implement `RefUnwindSafe` for atomic types][37178]
5141 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5142 * [Avoid allocations in `Decoder::read_str`][37064]
5143 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5144 * [Impl `Debug` for raw pointers to unsized data][36880]
5145 * [Don't reuse `HashMap` random seeds][37470]
5146 * [The internal memory layout of `HashMap` is more cache-friendly, for
5147 significant improvements in some operations][36692]
5148 * [`HashMap` uses less memory on 32-bit architectures][36595]
5149 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5154 * [Expose rustc cfg values to build scripts][cargo/3243]
5155 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5156 * [Fix passing --features when testing multiple packages][cargo/3280]
5157 * [Use a single profile set per workspace][cargo/3249]
5158 * [Load `replace` sections from lock files][cargo/3220]
5159 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5164 * [rustup is the recommended Rust installation method][1.14rustup]
5165 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5166 S390x. These are [tier 2] platforms and may have major defects. Follow the
5167 instructions on the website to install, or add the targets to an existing
5168 installation with `rustup target add`. The new target triples are:
5169 - `mips-unknown-linux-gnu`
5170 - `mipsel-unknown-linux-gnu`
5171 - `mips64-unknown-linux-gnuabi64`
5172 - `mips64el-unknown-linux-gnuabi64 `
5173 - `powerpc-unknown-linux-gnu`
5174 - `powerpc64-unknown-linux-gnu`
5175 - `powerpc64le-unknown-linux-gnu`
5176 - `s390x-unknown-linux-gnu `
5177 * This release includes target (std) builds for ARM Linux running MUSL
5178 libc. These are [tier 2] platforms and may have major defects. Add the
5179 following triples to an existing rustup installation with `rustup target add`:
5180 - `arm-unknown-linux-musleabi`
5181 - `arm-unknown-linux-musleabihf`
5182 - `armv7-unknown-linux-musleabihf`
5183 * This release includes [experimental support for WebAssembly][1.14wasm], via
5184 the `wasm32-unknown-emscripten` target. This target is known to have major
5185 defects. Please test, report, and fix.
5186 * rustup no longer installs documentation by default. Run `rustup
5187 component add rust-docs` to install.
5188 * [Fix line stepping in debugger][37310]
5189 * [Enable line number debuginfo in releases][37280]
5194 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5195 * [Add support for Fuchsia OS][37313]
5196 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5201 * [A number of forward-compatibility lints used by the compiler
5202 to gradually introduce language changes have been converted
5203 to deny by default][36894]:
5204 - ["use of inaccessible extern crate erroneously allowed"][36886]
5205 - ["type parameter default erroneously allowed in invalid location"][36887]
5206 - ["detects super or self keywords at the beginning of global path"][36888]
5207 - ["two overlapping inherent impls define an item with the same name
5208 were erroneously allowed"][36889]
5209 - ["floating-point constants cannot be used in patterns"][36890]
5210 - ["constants of struct or enum type can only be used in a pattern if
5211 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5212 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5213 * [Prohibit patterns in trait methods without bodies][37378]
5214 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5215 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5216 * [The `$crate` macro variable is accepted in fewer locations][37213]
5217 * [Impls specifying extra region requirements beyond the trait
5218 they implement are rejected][37167]
5219 * [Enums may not be unsized][37111]. Unsized enums are intended to
5220 work but never have. For now they are forbidden.
5221 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5223 [tier 2]: https://forge.rust-lang.org/platform-support.html
5224 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5225 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5226 [36430]: https://github.com/rust-lang/rust/pull/36430
5227 [36595]: https://github.com/rust-lang/rust/pull/36595
5228 [36595]: https://github.com/rust-lang/rust/pull/36595
5229 [36692]: https://github.com/rust-lang/rust/pull/36692
5230 [36767]: https://github.com/rust-lang/rust/pull/36767
5231 [36794]: https://github.com/rust-lang/rust/pull/36794
5232 [36798]: https://github.com/rust-lang/rust/pull/36798
5233 [36819]: https://github.com/rust-lang/rust/pull/36819
5234 [36822]: https://github.com/rust-lang/rust/pull/36822
5235 [36825]: https://github.com/rust-lang/rust/pull/36825
5236 [36843]: https://github.com/rust-lang/rust/pull/36843
5237 [36880]: https://github.com/rust-lang/rust/pull/36880
5238 [36886]: https://github.com/rust-lang/rust/issues/36886
5239 [36887]: https://github.com/rust-lang/rust/issues/36887
5240 [36888]: https://github.com/rust-lang/rust/issues/36888
5241 [36889]: https://github.com/rust-lang/rust/issues/36889
5242 [36890]: https://github.com/rust-lang/rust/issues/36890
5243 [36891]: https://github.com/rust-lang/rust/issues/36891
5244 [36892]: https://github.com/rust-lang/rust/issues/36892
5245 [36894]: https://github.com/rust-lang/rust/pull/36894
5246 [36917]: https://github.com/rust-lang/rust/pull/36917
5247 [36993]: https://github.com/rust-lang/rust/pull/36993
5248 [37037]: https://github.com/rust-lang/rust/pull/37037
5249 [37064]: https://github.com/rust-lang/rust/pull/37064
5250 [37094]: https://github.com/rust-lang/rust/pull/37094
5251 [37108]: https://github.com/rust-lang/rust/pull/37108
5252 [37111]: https://github.com/rust-lang/rust/pull/37111
5253 [37161]: https://github.com/rust-lang/rust/pull/37161
5254 [37162]: https://github.com/rust-lang/rust/pull/37162
5255 [37167]: https://github.com/rust-lang/rust/pull/37167
5256 [37178]: https://github.com/rust-lang/rust/pull/37178
5257 [37200]: https://github.com/rust-lang/rust/pull/37200
5258 [37213]: https://github.com/rust-lang/rust/pull/37213
5259 [37221]: https://github.com/rust-lang/rust/pull/37221
5260 [37224]: https://github.com/rust-lang/rust/pull/37224
5261 [37230]: https://github.com/rust-lang/rust/pull/37230
5262 [37231]: https://github.com/rust-lang/rust/pull/37231
5263 [37247]: https://github.com/rust-lang/rust/pull/37247
5264 [37267]: https://github.com/rust-lang/rust/pull/37267
5265 [37270]: https://github.com/rust-lang/rust/pull/37270
5266 [37273]: https://github.com/rust-lang/rust/pull/37273
5267 [37280]: https://github.com/rust-lang/rust/pull/37280
5268 [37298]: https://github.com/rust-lang/rust/pull/37298
5269 [37306]: https://github.com/rust-lang/rust/pull/37306
5270 [37310]: https://github.com/rust-lang/rust/pull/37310
5271 [37312]: https://github.com/rust-lang/rust/pull/37312
5272 [37313]: https://github.com/rust-lang/rust/pull/37313
5273 [37315]: https://github.com/rust-lang/rust/pull/37315
5274 [37318]: https://github.com/rust-lang/rust/pull/37318
5275 [37322]: https://github.com/rust-lang/rust/pull/37322
5276 [37326]: https://github.com/rust-lang/rust/pull/37326
5277 [37351]: https://github.com/rust-lang/rust/pull/37351
5278 [37356]: https://github.com/rust-lang/rust/pull/37356
5279 [37367]: https://github.com/rust-lang/rust/pull/37367
5280 [37373]: https://github.com/rust-lang/rust/pull/37373
5281 [37378]: https://github.com/rust-lang/rust/pull/37378
5282 [37389]: https://github.com/rust-lang/rust/pull/37389
5283 [37392]: https://github.com/rust-lang/rust/pull/37392
5284 [37427]: https://github.com/rust-lang/rust/pull/37427
5285 [37439]: https://github.com/rust-lang/rust/pull/37439
5286 [37445]: https://github.com/rust-lang/rust/pull/37445
5287 [37470]: https://github.com/rust-lang/rust/pull/37470
5288 [37569]: https://github.com/rust-lang/rust/pull/37569
5289 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5290 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5291 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5292 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5293 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5294 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5295 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5298 Version 1.13.0 (2016-11-10)
5299 ===========================
5304 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5305 errors, like the `try!` macro, described in [RFC 0243].
5306 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5307 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5308 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5309 * [Fix lifetime rules for 'if' conditions][36029]
5310 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5315 * [Add the `-C link-arg` argument][36574]
5316 * [Remove the old AST-based backend from rustc_trans][35764]
5317 * [Don't enable NEON by default on armv7 Linux][35814]
5318 * [Fix debug line number info for macro expansions][35238]
5319 * [Do not emit "class method" debuginfo for types that are not
5320 DICompositeType][36008]
5321 * [Warn about multiple conflicting #[repr] hints][34623]
5322 * [When sizing DST, don't double-count nested struct prefixes][36351]
5323 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5324 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5325 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5326 * [Expand macros without recursing to avoid stack overflows][36214]
5331 * [Replace macro backtraces with labeled local uses][35702]
5332 * [Improve error message for misplaced doc comments][33922]
5333 * [Buffer unix and lock windows to prevent message interleaving][35975]
5334 * [Update lifetime errors to specifically note temporaries][36171]
5335 * [Special case a few colors for Windows][36178]
5336 * [Suggest `use self` when such an import resolves][36289]
5337 * [Be more specific when type parameter shadows primitive type][36338]
5338 * Many minor improvements
5340 Compile-time Optimizations
5341 --------------------------
5343 * [Compute and cache HIR hashes at beginning][35854]
5344 * [Don't hash types in loan paths][36004]
5345 * [Cache projections in trans][35761]
5346 * [Optimize the parser's last token handling][36527]
5347 * [Only instantiate #[inline] functions in codegen units referencing
5348 them][36524]. This leads to big improvements in cases where crates export
5349 define many inline functions without using them directly.
5350 * [Lazily allocate TypedArena's first chunk][36592]
5351 * [Don't allocate during default HashSet creation][36734]
5358 * [`overflowing_abs`]
5359 * [`RefCell::try_borrow`]
5360 * [`RefCell::try_borrow_mut`]
5365 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5366 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5368 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5369 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5370 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5371 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5372 * [Use arc4rand on FreeBSD][35884]
5373 * [memrchr: Correct aligned offset computation][35969]
5374 * [Improve Demangling of Rust Symbols][36059]
5375 * [Use monotonic time in condition variables][35048]
5376 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5377 * [Implement conversion traits for `char`][35755]
5378 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5379 * [Zero first byte of CString on drop][36264]
5380 * [Inherit overflow checks for sum and product][36372]
5381 * [Add missing Eq implementations][36423]
5382 * [Implement `Debug` for `DirEntry`][36631]
5383 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5385 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5386 * [Implement more traits for `std::io::ErrorKind`][35911]
5387 * [Optimize BinaryHeap bounds checking][36072]
5388 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5389 `extend_with_element`][36355]
5390 * [Fix overflow checking in unsigned pow()][34942]
5395 * This release includes security fixes to both curl and OpenSSL.
5396 * [Fix transitive doctests when panic=abort][cargo/3021]
5397 * [Add --all-features flag to cargo][cargo/3038]
5398 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5399 * [Don't parse the home directory more than once][cargo/3078]
5400 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5401 * [Update OpenSSL to 1.0.2j][cargo/3121]
5402 * [Add license and license_file to cargo metadata output][cargo/3110]
5403 * [Make crates-io registry URL optional in config; ignore all changes to
5404 source.crates-io][cargo/3089]
5405 * [Don't download dependencies from other platforms][cargo/3123]
5406 * [Build transitive dev-dependencies when needed][cargo/3125]
5407 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5408 * [Avoid updating registry when adding existing deps][cargo/3144]
5409 * [Warn about path overrides that won't work][cargo/3136]
5410 * [Use workspaces during `cargo install`][cargo/3146]
5411 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5412 * [Add --message-format flag][cargo/3000]
5413 * [Pass target environment for rustdoc][cargo/3205]
5414 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5415 * [Update curl and curl-sys][cargo/3241]
5416 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5421 * [rustdoc: Add the `--sysroot` argument][36586]
5422 * [rustdoc: Fix a couple of issues with the search results][35655]
5423 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5424 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5425 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5430 * [Remove unmaintained style guide][35124]
5431 * [Add s390x support][36369]
5432 * [Initial work at Haiku OS support][36727]
5433 * [Add mips-uclibc targets][35734]
5434 * [Crate-ify compiler-rt into compiler-builtins][35021]
5435 * [Add rustc version info (git hash + date) to dist tarball][36213]
5436 * Many documentation improvements
5441 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5442 * [Deny (by default) transmuting from fn item types to pointer-sized
5443 types][34923]. Continuing the long transition to zero-sized fn items,
5445 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5447 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5448 * [Fix lifetime rules for 'if' conditions][36029].
5449 * [Inherit overflow checks for sum and product][36372].
5450 * [Forbid user-defined macros named "macro_rules"][36730].
5452 [33922]: https://github.com/rust-lang/rust/pull/33922
5453 [34623]: https://github.com/rust-lang/rust/pull/34623
5454 [34923]: https://github.com/rust-lang/rust/pull/34923
5455 [34942]: https://github.com/rust-lang/rust/pull/34942
5456 [34982]: https://github.com/rust-lang/rust/pull/34982
5457 [35021]: https://github.com/rust-lang/rust/pull/35021
5458 [35048]: https://github.com/rust-lang/rust/pull/35048
5459 [35074]: https://github.com/rust-lang/rust/pull/35074
5460 [35124]: https://github.com/rust-lang/rust/pull/35124
5461 [35234]: https://github.com/rust-lang/rust/pull/35234
5462 [35238]: https://github.com/rust-lang/rust/pull/35238
5463 [35354]: https://github.com/rust-lang/rust/pull/35354
5464 [35559]: https://github.com/rust-lang/rust/pull/35559
5465 [35585]: https://github.com/rust-lang/rust/pull/35585
5466 [35627]: https://github.com/rust-lang/rust/pull/35627
5467 [35655]: https://github.com/rust-lang/rust/pull/35655
5468 [35702]: https://github.com/rust-lang/rust/pull/35702
5469 [35707]: https://github.com/rust-lang/rust/pull/35707
5470 [35728]: https://github.com/rust-lang/rust/pull/35728
5471 [35734]: https://github.com/rust-lang/rust/pull/35734
5472 [35755]: https://github.com/rust-lang/rust/pull/35755
5473 [35761]: https://github.com/rust-lang/rust/pull/35761
5474 [35764]: https://github.com/rust-lang/rust/pull/35764
5475 [35814]: https://github.com/rust-lang/rust/pull/35814
5476 [35854]: https://github.com/rust-lang/rust/pull/35854
5477 [35871]: https://github.com/rust-lang/rust/pull/35871
5478 [35884]: https://github.com/rust-lang/rust/pull/35884
5479 [35911]: https://github.com/rust-lang/rust/pull/35911
5480 [35969]: https://github.com/rust-lang/rust/pull/35969
5481 [35975]: https://github.com/rust-lang/rust/pull/35975
5482 [36004]: https://github.com/rust-lang/rust/pull/36004
5483 [36008]: https://github.com/rust-lang/rust/pull/36008
5484 [36014]: https://github.com/rust-lang/rust/pull/36014
5485 [36029]: https://github.com/rust-lang/rust/pull/36029
5486 [36059]: https://github.com/rust-lang/rust/pull/36059
5487 [36072]: https://github.com/rust-lang/rust/pull/36072
5488 [36101]: https://github.com/rust-lang/rust/pull/36101
5489 [36104]: https://github.com/rust-lang/rust/pull/36104
5490 [36171]: https://github.com/rust-lang/rust/pull/36171
5491 [36173]: https://github.com/rust-lang/rust/pull/36173
5492 [36178]: https://github.com/rust-lang/rust/pull/36178
5493 [36213]: https://github.com/rust-lang/rust/pull/36213
5494 [36214]: https://github.com/rust-lang/rust/pull/36214
5495 [36264]: https://github.com/rust-lang/rust/pull/36264
5496 [36266]: https://github.com/rust-lang/rust/pull/36266
5497 [36289]: https://github.com/rust-lang/rust/pull/36289
5498 [36338]: https://github.com/rust-lang/rust/pull/36338
5499 [36351]: https://github.com/rust-lang/rust/pull/36351
5500 [36355]: https://github.com/rust-lang/rust/pull/36355
5501 [36369]: https://github.com/rust-lang/rust/pull/36369
5502 [36372]: https://github.com/rust-lang/rust/pull/36372
5503 [36423]: https://github.com/rust-lang/rust/pull/36423
5504 [36482]: https://github.com/rust-lang/rust/pull/36482
5505 [36505]: https://github.com/rust-lang/rust/pull/36505
5506 [36524]: https://github.com/rust-lang/rust/pull/36524
5507 [36527]: https://github.com/rust-lang/rust/pull/36527
5508 [36551]: https://github.com/rust-lang/rust/pull/36551
5509 [36574]: https://github.com/rust-lang/rust/pull/36574
5510 [36586]: https://github.com/rust-lang/rust/pull/36586
5511 [36592]: https://github.com/rust-lang/rust/pull/36592
5512 [36631]: https://github.com/rust-lang/rust/pull/36631
5513 [36639]: https://github.com/rust-lang/rust/pull/36639
5514 [36721]: https://github.com/rust-lang/rust/pull/36721
5515 [36727]: https://github.com/rust-lang/rust/pull/36727
5516 [36730]: https://github.com/rust-lang/rust/pull/36730
5517 [36734]: https://github.com/rust-lang/rust/pull/36734
5518 [36754]: https://github.com/rust-lang/rust/pull/36754
5519 [36995]: https://github.com/rust-lang/rust/pull/36995
5520 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5521 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5522 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5523 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5524 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5525 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5526 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5527 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5528 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5529 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5530 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5531 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5532 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5533 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5534 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5535 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5536 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5537 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5538 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5539 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5540 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5541 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5542 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5543 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5544 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5545 [rustup]: https://www.rustup.rs
5546 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5547 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5548 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5549 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5550 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5551 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5552 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5555 Version 1.12.1 (2016-10-20)
5556 ===========================
5561 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5562 * [Confusion with double negation and booleans][36856]
5563 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5564 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5565 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5566 * [Corrupted memory after updated to 1.12][36936]
5567 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5568 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5569 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5571 [36381]: https://github.com/rust-lang/rust/issues/36381
5572 [36856]: https://github.com/rust-lang/rust/issues/36856
5573 [36875]: https://github.com/rust-lang/rust/issues/36875
5574 [36924]: https://github.com/rust-lang/rust/issues/36924
5575 [36926]: https://github.com/rust-lang/rust/issues/36926
5576 [36936]: https://github.com/rust-lang/rust/issues/36936
5577 [37026]: https://github.com/rust-lang/rust/issues/37026
5578 [37112]: https://github.com/rust-lang/rust/issues/37112
5579 [37153]: https://github.com/rust-lang/rust/issues/37153
5582 Version 1.12.0 (2016-09-29)
5583 ===========================
5588 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5589 This translation pass is far simpler than the previous AST->LLVM pass, and
5590 creates opportunities to perform new optimizations directly on the MIR. It
5591 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5592 * [`rustc` presents a new, more readable error format, along with
5593 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5594 Most common editors supporting Rust have been updated to work with it. It was
5595 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5600 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5601 This translation pass is far simpler than the previous AST->LLVM pass, and
5602 creates opportunities to perform new optimizations directly on the MIR. It
5603 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5604 * [Print the Rust target name, not the LLVM target name, with
5605 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5606 * [The computation of `TypeId` is correct in some cases where it was previously
5607 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5608 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5609 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5610 `--print relocation-models`, and `--print code-models` print the available
5611 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5612 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5613 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5614 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5615 These targets produce statically-linked binaries. There are no binary release
5621 * [`rustc` presents a new, more readable error format, along with
5622 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5623 Most common editors supporting Rust have been updated to work with it. It was
5624 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5625 * [In error descriptions, references are now described in plain English,
5626 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5627 * [In error type descriptions, unknown numeric types are named `{integer}` or
5628 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5629 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5634 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5635 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5636 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5637 useful](https://github.com/rust-lang/rust/pull/34908)
5638 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5639 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5640 * [Semicolons are properly required as statement delimiters inside
5641 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5642 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5647 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5648 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5649 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5650 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5651 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5652 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5653 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5654 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5655 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5656 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5657 Both on Unix and Windows.
5658 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5659 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5660 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5661 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5662 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5663 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5664 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5665 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5670 * [The `format!` macro and friends now allow a single argument to be formatted
5671 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5672 * [The lifetime bounds on `[T]::binary_search_by` and
5673 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5674 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5675 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5676 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5677 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5678 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5679 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5680 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5681 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5682 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5683 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5684 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5685 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5686 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5687 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5688 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5689 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5690 * [`mpsc::sync_channel` `Receiver`s return any available message before
5691 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5692 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5693 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5698 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5699 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5700 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5701 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5702 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5703 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5704 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5705 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5706 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5707 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5708 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5709 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5710 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5711 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5712 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5713 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5718 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5719 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5724 * [Test binaries now support a `--test-threads` argument to specify the number
5725 of threads used to run tests, and which acts the same as the
5726 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5727 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5728 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5729 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5730 * [Rust releases now come with source packages that can be installed by rustup
5731 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5732 The resulting source code can be used by tools and IDES, located in the
5733 sysroot under `lib/rustlib/src`.
5738 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5739 * Many minor improvements to the documentation.
5740 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5745 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5746 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5747 * [When formatting strings, if "precision" is specified, the "fill",
5748 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5749 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5752 Version 1.11.0 (2016-08-18)
5753 ===========================
5758 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5759 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5760 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5761 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5766 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5767 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5768 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5769 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5770 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5771 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5772 (in libcore - previously stabilized in libstd)
5773 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5774 (in libcore - previously stabilized in libstd)
5775 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5776 (in libcore - previously stabilized in libstd)
5777 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5778 (in libcore - previously stabilized in libstd)
5779 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5780 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5781 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5782 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5787 * [The `thread_local!` macro supports multiple definitions in a single
5788 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5789 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5790 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5791 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5792 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5793 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5794 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5795 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5800 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5801 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5802 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5803 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5804 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5805 and `-vv` prints warnings for all crates.
5806 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5807 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5808 This provides room for expansion by arbitrary tools.
5809 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5810 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5811 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5812 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5813 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5814 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5815 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5820 * [Caching projections speeds up type check dramatically for some
5821 workloads](https://github.com/rust-lang/rust/pull/33816)
5822 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5823 This hasher is faster, but is believed to provide sufficient
5824 protection from collision attacks.
5825 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5830 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5831 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5832 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5833 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5834 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5839 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5840 * [When emitting debug info, rustc emits frame pointers for closures,
5841 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5842 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5843 * Many more errors have been given error codes and extended
5845 * API documentation continues to be improved, with many new examples
5850 * [rustc no longer hangs when dependencies recursively re-export
5851 submodules](https://github.com/rust-lang/rust/pull/34542)
5852 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5853 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5854 rewritten](https://github.com/rust-lang/rust/pull/33895)
5855 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5856 No targets use this yet, but it works toward AVR support.
5861 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5862 * [The new follow-set rules that place restrictions on `macro_rules!`
5863 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5864 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5865 and has been a warning since 1.10.
5866 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5867 This causes breakage in some corner cases.
5870 Version 1.10.0 (2016-07-07)
5871 ===========================
5876 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5877 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5878 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5879 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5880 * [`panic!` can be converted to a runtime abort with the
5881 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5882 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5883 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5884 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5885 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5886 Note that Cargo does not yet directly support cdylibs.
5891 * `os::windows::fs::OpenOptionsExt::access_mode`
5892 * `os::windows::fs::OpenOptionsExt::share_mode`
5893 * `os::windows::fs::OpenOptionsExt::custom_flags`
5894 * `os::windows::fs::OpenOptionsExt::attributes`
5895 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5896 * `os::unix::fs::OpenOptionsExt::custom_flags`
5897 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5898 * `Default for sync::Weak`
5899 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5900 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5901 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5902 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5903 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5904 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5905 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5906 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5907 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5908 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5909 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5910 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5911 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5912 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5913 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5914 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5915 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5916 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5917 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5918 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5919 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5920 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5921 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5922 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5923 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5924 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5925 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5926 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5927 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5928 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5929 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5930 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5931 * Read/Write/RawFd impls for `UnixStream`
5932 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5933 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5934 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5935 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5936 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5937 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5938 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5939 * RawFd impls for `UnixListener`
5940 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5941 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5942 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5943 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5944 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5945 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5946 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5947 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5948 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5949 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5950 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5951 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5952 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5953 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5954 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5955 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5956 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5957 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5958 * RawFd impls for `UnixDatagram`
5959 * `{BTree,Hash}Map::values_mut`
5960 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5965 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5966 The semantics of this minor method are subtle and probably not what
5968 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5969 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5970 will fall back to `/dev/urandom` temporarily to avoid blocking
5971 during early boot](https://github.com/rust-lang/rust/pull/33086).
5972 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5973 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5974 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5975 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5976 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5977 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5978 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5982 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5983 This controls the runtime behavior of the `panic!` macro
5984 and can be either "unwind" (the default), or "abort".
5985 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5986 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5987 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5988 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5989 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5990 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5991 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5992 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5993 By default they are retried twice, which can be customized with the
5994 `net.retry` value in `.cargo/config`.
5995 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5996 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5997 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5998 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5999 Makes it possible to install multiple crates in parallel.
6000 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
6001 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
6002 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
6003 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
6004 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
6005 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6010 * [rustc memory usage was reduced by refactoring the context used for
6011 type checking](https://github.com/rust-lang/rust/pull/33425).
6012 * [Speed up creation of `HashMap`s by caching the random keys used
6013 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6014 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6015 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6016 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6017 10x faster than the previous lookup tables.
6018 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6023 * Many incremental improvements to documentation and rustdoc.
6024 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6025 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6026 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6027 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6028 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6029 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6030 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6035 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6036 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6037 * [`std` no longer prints backtraces on platforms where the running
6038 module must be loaded with `env::current_exe`, which can't be relied
6039 on](https://github.com/rust-lang/rust/pull/33554).
6040 * This release includes std binaries for the i586-unknown-linux-gnu,
6041 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6042 i586 target is for old x86 hardware without SSE2, and the armv7
6043 target is for Android running on modern ARM architectures.
6044 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6045 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6046 * [On Unix the runtime aborts by calling `libc::abort` instead of
6047 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6048 * [Rust is now bootstrapped from the previous release of Rust,
6049 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6054 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6055 * [`target_env` for Linux ARM targets is just `gnu`, not
6056 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6057 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6058 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6059 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6060 Affects how macros are parsed.
6061 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6062 * [Feature-gated attributes on macro-generated macro invocations are
6063 now rejected](https://github.com/rust-lang/rust/pull/32791).
6064 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6065 This caused some minor changes to type inference.
6068 Version 1.9.0 (2016-05-26)
6069 ==========================
6074 * The `#[deprecated]` attribute when applied to an API will generate
6075 warnings when used. The warnings may be suppressed with
6076 `#[allow(deprecated)]`. [RFC 1270].
6077 * [`fn` item types are zero sized, and each `fn` names a unique
6078 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6079 `transmute` on a `fn` type will generate a warning for a few cycles,
6080 then will be converted to an error.
6081 * [Field and method resolution understand visibility, so private
6082 fields and methods cannot prevent the proper use of public fields
6083 and methods][1.9fv].
6084 * [The parser considers unicode codepoints in the
6085 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6091 * [`std::panic::catch_unwind`] (renamed from `recover`)
6092 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6093 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6094 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6095 * [`str::is_char_boundary`]
6096 * [`<*const T>::as_ref`]
6097 * [`<*mut T>::as_ref`]
6098 * [`<*mut T>::as_mut`]
6099 * [`AsciiExt::make_ascii_uppercase`]
6100 * [`AsciiExt::make_ascii_lowercase`]
6101 * [`char::decode_utf16`]
6102 * [`char::DecodeUtf16`]
6103 * [`char::DecodeUtf16Error`]
6104 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6105 * [`BTreeSet::take`]
6106 * [`BTreeSet::replace`]
6109 * [`HashSet::replace`]
6111 * [`OsString::with_capacity`]
6112 * [`OsString::clear`]
6113 * [`OsString::capacity`]
6114 * [`OsString::reserve`]
6115 * [`OsString::reserve_exact`]
6116 * [`OsStr::is_empty`]
6118 * [`std::os::unix::thread`]
6121 * [`JoinHandleExt::as_pthread_t`]
6122 * [`JoinHandleExt::into_pthread_t`]
6123 * [`HashSet::hasher`]
6124 * [`HashMap::hasher`]
6125 * [`CommandExt::exec`]
6126 * [`File::try_clone`]
6127 * [`SocketAddr::set_ip`]
6128 * [`SocketAddr::set_port`]
6129 * [`SocketAddrV4::set_ip`]
6130 * [`SocketAddrV4::set_port`]
6131 * [`SocketAddrV6::set_ip`]
6132 * [`SocketAddrV6::set_port`]
6133 * [`SocketAddrV6::set_flowinfo`]
6134 * [`SocketAddrV6::set_scope_id`]
6135 * [`slice::copy_from_slice`]
6136 * [`ptr::read_volatile`]
6137 * [`ptr::write_volatile`]
6138 * [`OpenOptions::create_new`]
6139 * [`TcpStream::set_nodelay`]
6140 * [`TcpStream::nodelay`]
6141 * [`TcpStream::set_ttl`]
6142 * [`TcpStream::ttl`]
6143 * [`TcpStream::set_only_v6`]
6144 * [`TcpStream::only_v6`]
6145 * [`TcpStream::take_error`]
6146 * [`TcpStream::set_nonblocking`]
6147 * [`TcpListener::set_ttl`]
6148 * [`TcpListener::ttl`]
6149 * [`TcpListener::set_only_v6`]
6150 * [`TcpListener::only_v6`]
6151 * [`TcpListener::take_error`]
6152 * [`TcpListener::set_nonblocking`]
6153 * [`UdpSocket::set_broadcast`]
6154 * [`UdpSocket::broadcast`]
6155 * [`UdpSocket::set_multicast_loop_v4`]
6156 * [`UdpSocket::multicast_loop_v4`]
6157 * [`UdpSocket::set_multicast_ttl_v4`]
6158 * [`UdpSocket::multicast_ttl_v4`]
6159 * [`UdpSocket::set_multicast_loop_v6`]
6160 * [`UdpSocket::multicast_loop_v6`]
6161 * [`UdpSocket::set_multicast_ttl_v6`]
6162 * [`UdpSocket::multicast_ttl_v6`]
6163 * [`UdpSocket::set_ttl`]
6164 * [`UdpSocket::ttl`]
6165 * [`UdpSocket::set_only_v6`]
6166 * [`UdpSocket::only_v6`]
6167 * [`UdpSocket::join_multicast_v4`]
6168 * [`UdpSocket::join_multicast_v6`]
6169 * [`UdpSocket::leave_multicast_v4`]
6170 * [`UdpSocket::leave_multicast_v6`]
6171 * [`UdpSocket::take_error`]
6172 * [`UdpSocket::connect`]
6173 * [`UdpSocket::send`]
6174 * [`UdpSocket::recv`]
6175 * [`UdpSocket::set_nonblocking`]
6180 * [`std::sync::Once` is poisoned if its initialization function
6182 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6183 * [Most types implement `fmt::Debug`][1.9db].
6184 * [The default buffer size used by `BufReader` and `BufWriter` was
6185 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6186 used by other languages.
6187 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6188 `Duration` additionally implements `*=` and `/=`][1.9ta].
6189 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6190 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6191 * [`Chain` implements `BufRead`][1.9ch].
6192 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6197 * [Cargo can now run concurrently][1.9cc].
6198 * [Top-level overrides allow specific revisions of crates to be
6199 overridden through the entire crate graph][1.9ct]. This is intended
6200 to make upgrades easier for large projects, by allowing crates to be
6201 forked temporarily until they've been upgraded and republished.
6202 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6203 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6204 on the commandline][1.9cf]. `rustc` arguments can also be specified
6205 in the `build.rustflags` configuration key.
6210 * [The time complexity of comparing variables for equivalence during type
6211 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6212 to major compilation time improvement in some scenarios.
6213 * [`ToString` is specialized for `str`, giving it the same performance
6214 as `to_owned`][1.9ts].
6215 * [Spawning processes with `Command::output` no longer creates extra
6217 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6218 for C-like enums][1.9cl].
6223 * [Passing the `--quiet` flag to a test runner will produce
6224 much-abbreviated output][1.9q].
6225 * The Rust Project now publishes std binaries for the
6226 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6227 `i586-pc-windows-msvc` targets.
6232 * [`std::sync::Once` is poisoned if its initialization function
6234 * [It is illegal to define methods with the same name in overlapping
6235 inherent `impl` blocks][1.9sn].
6236 * [`fn` item types are zero sized, and each `fn` names a unique
6237 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6238 `transmute` on a `fn` type will generate a warning for a few cycles,
6239 then will be converted to an error.
6240 * [Improvements to const evaluation may trigger new errors when integer
6241 literals are out of range][1.9ce].
6244 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6245 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6246 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6247 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6248 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6249 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6250 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6251 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6252 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6253 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6254 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6255 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6256 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6257 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6258 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6259 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6260 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6261 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6262 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6263 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6264 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6265 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6266 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6267 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6268 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6269 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6270 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6271 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6272 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6273 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6274 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6275 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6276 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6277 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6278 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6279 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6280 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6281 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6282 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6283 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6284 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6285 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6286 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6287 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6288 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6289 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6290 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6291 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6292 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6293 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6294 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6295 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6296 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6297 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6298 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6299 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6300 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6301 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6302 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6303 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6304 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6305 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6306 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6307 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6308 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6309 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6310 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6311 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6312 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6313 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6314 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6315 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6316 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6317 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6318 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6319 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6320 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6321 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6322 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6323 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6324 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6325 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6326 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6327 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6328 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6329 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6330 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6331 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6332 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6333 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6334 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6335 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6336 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6337 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6338 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6339 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6340 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6341 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6342 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6343 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6344 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6345 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6346 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6347 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6348 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6349 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6350 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6351 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6352 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6353 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6356 Version 1.8.0 (2016-04-14)
6357 ==========================
6362 * Rust supports overloading of compound assignment statements like
6363 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6364 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6365 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6367 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6368 addition to the non-braced form, `struct Foo;`. [RFC 218].
6374 * [`str::encode_utf16`] (renamed from `utf16_units`)
6375 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6378 * [`ptr::drop_in_place`]
6380 * [`time::SystemTime`]
6382 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6383 * [`Instant::elapsed`]
6384 * [`SystemTime::now`]
6385 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6386 * [`SystemTime::elapsed`]
6387 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6388 * [`SystemTimeError`]
6389 * [`SystemTimeError::duration`]
6390 * Various impls for `SystemTimeError`
6392 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6393 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6394 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6395 * [The `write!` and `writeln!` macros correctly emit errors if any of
6396 their arguments can't be formatted][1.8w].
6397 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6398 * [The Unix-specific `raw` modules, which contain a number of
6399 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6400 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6401 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6402 across platforms was making it difficult to implement `std`
6403 correctly. Those that need these definitions should use the `libc`
6405 * The Unix-specific `MetadataExt` traits, including
6406 `os::unix::fs::MetadataExt`, which expose values such as inode
6407 numbers [no longer return platform-specific types][1.8r], but
6408 instead return widened integers. [RFC 1415].
6409 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6410 * [Atomic loads and stores are not volatile][1.8a].
6411 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6416 * [Inlining hash functions lead to a 3% compile-time improvement in
6417 some workloads][1.8h].
6418 * When using jemalloc, its symbols are [unprefixed so that it
6419 overrides the libc malloc implementation][1.8h]. This means that for
6420 rustc, LLVM is now using jemalloc, which results in a 6%
6421 compile-time improvement on a specific workload.
6422 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6427 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6428 i686-pc-windows-msvc is now considered a tier-1 platform.
6429 * [The `--print targets` flag prints a list of supported targets][1.8t].
6430 * [The `--print cfg` flag prints the `cfg`s defined for the current
6432 * [`rustc` can be built with an new Cargo-based build system, written
6433 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6434 build system. To enable it configure with `configure --rustbuild`.
6435 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6436 variants while also indicating the total number of missing variants
6437 if more than 3][1.8m].
6438 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6439 * The Rust Project now publishes binary releases of the standard
6440 library for a number of tier-2 targets:
6441 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6442 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6443 `x86_64-rumprun-netbsd`. These can be installed with
6444 tools such as [multirust][1.8mr].
6449 * [`cargo init` creates a new Cargo project in the current
6450 directory][1.8ci]. It is otherwise like `cargo new`.
6451 * [Cargo has configuration keys for `-v` and
6452 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6453 `[term]` section of `.cargo/config`.
6454 * [Configuration keys that evaluate to strings or integers can be set
6455 via environment variables][1.8ce]. For example the `build.jobs` key
6456 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6457 precedence over config files.
6458 * [Target-specific dependencies support Rust `cfg` syntax for
6459 describing targets][1.8cfg] so that dependencies for multiple
6460 targets can be specified together. [RFC 1361].
6461 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6462 `RUSTDOC` take precedence over the `build.target-dir`,
6463 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6464 * [The child process tree is killed on Windows when Cargo is
6466 * [The `build.target` configuration value sets the target platform,
6467 like `--target`][1.8ct].
6472 * [Unstable compiler flags have been further restricted][1.8u]. Since
6473 1.0 `-Z` flags have been considered unstable, and other flags that
6474 were considered unstable additionally required passing `-Z
6475 unstable-options` to access. Unlike unstable language and library
6476 features though, these options have been accessible on the stable
6477 release channel. Going forward, *new unstable flags will not be
6478 available on the stable release channel*, and old unstable flags
6479 will warn about their usage. In the future, all unstable flags will
6480 be unavailable on the stable release channel.
6481 * [It is no longer possible to `match` on empty enum variants using
6482 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6483 * The Unix-specific `MetadataExt` traits, including
6484 `os::unix::fs::MetadataExt`, which expose values such as inode
6485 numbers [no longer return platform-specific types][1.8r], but
6486 instead return widened integers. [RFC 1415].
6487 * [Modules sourced from the filesystem cannot appear within arbitrary
6488 blocks, but only within other modules][1.8mf].
6489 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6490 * On Unix, [stack overflow triggers a runtime abort instead of a
6492 * [`Command::spawn` and its equivalents return an error if any of
6493 its command-line arguments contain interior `NUL`s][1.8n].
6494 * [Tuple and unit enum variants from other crates are in the type
6496 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6497 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6498 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6499 instead of `foo.lib`.
6502 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6503 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6504 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6505 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6506 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6507 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6508 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6509 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6510 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6511 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6512 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6513 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6514 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6515 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6516 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6517 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6518 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6519 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6520 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6521 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6522 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6523 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6524 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6525 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6526 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6527 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6528 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6529 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6530 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6531 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6532 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6533 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6534 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6535 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6536 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6537 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6538 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6539 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6540 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6541 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6542 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6543 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6544 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6545 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6546 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6547 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6548 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6549 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6550 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6551 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6552 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6553 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6554 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6555 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6556 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6557 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6558 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6559 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6560 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6561 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6564 Version 1.7.0 (2016-03-03)
6565 ==========================
6572 * [`Path::strip_prefix`] (renamed from relative_from)
6573 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6575 * [`Ipv4Addr::is_loopback`]
6576 * [`Ipv4Addr::is_private`]
6577 * [`Ipv4Addr::is_link_local`]
6578 * [`Ipv4Addr::is_multicast`]
6579 * [`Ipv4Addr::is_broadcast`]
6580 * [`Ipv4Addr::is_documentation`]
6582 * [`Ipv6Addr::is_unspecified`]
6583 * [`Ipv6Addr::is_loopback`]
6584 * [`Ipv6Addr::is_multicast`]
6587 * [`Vec::as_mut_slice`]
6589 * [`String::as_str`]
6590 * [`String::as_mut_str`]
6592 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6594 * `<[T]>::`[`sort_by_key`]
6595 * checked, saturated, and overflowing operations
6596 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6597 * [`i32::saturating_mul`]
6598 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6599 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6600 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6601 * [`u32::saturating_mul`]
6602 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6603 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6604 * and checked, saturated, and overflowing operations for other primitive types
6606 * [`ffi::IntoStringError`]
6607 * [`CString::into_string`]
6608 * [`CString::into_bytes`]
6609 * [`CString::into_bytes_with_nul`]
6610 * `From<CString> for Vec<u8>`
6612 * [`IntoStringError::into_cstring`]
6613 * [`IntoStringError::utf8_error`]
6614 * `Error for IntoStringError`
6616 * [`std::hash::BuildHasher`]
6617 * [`BuildHasher::Hasher`]
6618 * [`BuildHasher::build_hasher`]
6619 * [`std::hash::BuildHasherDefault`]
6620 * [`HashMap::with_hasher`]
6621 * [`HashMap::with_capacity_and_hasher`]
6622 * [`HashSet::with_hasher`]
6623 * [`HashSet::with_capacity_and_hasher`]
6624 * [`std::collections::hash_map::RandomState`]
6625 * [`RandomState::new`]
6626 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6627 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6628 from bytes is faster.
6629 * [The performance of `LineWriter` (and thus `io::stdout`) was
6630 improved by using `memchr` to search for newlines][1.7m].
6631 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6632 `f64` variants were stabilized previously.
6633 * [`BTreeMap` was rewritten to use less memory and improve the performance
6634 of insertion and iteration, the latter by as much as 5x][1.7bm].
6635 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6636 covariant over their contained type][1.7bt].
6637 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6638 over their contained type][1.7ll].
6639 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6641 * [`Any` is implemented for unsized types][1.7a].
6642 * [`Hash` is implemented for `Duration`][1.7h].
6647 * [When running tests with `--test`, rustdoc will pass `--cfg`
6648 arguments to the compiler][1.7dt].
6649 * [The compiler is built with RPATH information by default][1.7rpa].
6650 This means that it will be possible to run `rustc` when installed in
6651 unusual configurations without configuring the dynamic linker search
6653 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6654 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6655 over `LD_LIBRARY_PATH`.
6660 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6661 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6662 * [The `rerun-if-changed` build script directive no longer causes the
6663 build script to incorrectly run twice in certain scenarios][1.7rr].
6668 * Soundness fixes to the interactions between associated types and
6669 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6670 code that violates the new rules. This is a significant change that
6671 is known to break existing code, so it has emitted warnings for the
6672 new error cases since 1.4 to give crate authors time to adapt. The
6673 details of what is changing are subtle; read the RFC for more.
6674 * [Several bugs in the compiler's visibility calculations were
6675 fixed][1.7v]. Since this was found to break significant amounts of
6676 code, the new errors will be emitted as warnings for several release
6677 cycles, under the `private_in_public` lint.
6678 * Defaulted type parameters were accidentally accepted in positions
6679 that were not intended. In this release, [defaulted type parameters
6680 appearing outside of type definitions will generate a
6681 warning][1.7d], which will become an error in future releases.
6682 * [Parsing "." as a float results in an error instead of 0][1.7p].
6683 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6684 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6686 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6687 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6688 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6689 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6690 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6691 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6692 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6693 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6694 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6695 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6696 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6697 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6698 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6699 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6700 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6701 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6702 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6703 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6704 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6705 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6706 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6707 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6708 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6709 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6710 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6711 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6712 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6713 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6714 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6715 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6716 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6717 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6718 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6719 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6720 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6721 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6722 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6723 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6724 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6725 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6726 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6727 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6728 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6729 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6730 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6731 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6732 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6733 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6734 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6735 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6736 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6737 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6738 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6739 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6740 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6741 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6742 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6743 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6744 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6745 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6746 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6747 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6748 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6749 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6750 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6751 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6752 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6753 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6754 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6755 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6756 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6757 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6758 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6759 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6760 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6761 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6762 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6763 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6764 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6767 Version 1.6.0 (2016-01-21)
6768 ==========================
6773 * The `#![no_std]` attribute causes a crate to not be linked to the
6774 standard library, but only the [core library][1.6co], as described
6775 in [RFC 1184]. The core library defines common types and traits but
6776 has no platform dependencies whatsoever, and is the basis for Rust
6777 software in environments that cannot support a full port of the
6778 standard library, such as operating systems. Most of the core
6779 library is now stable.
6785 [`Read::read_exact`],
6786 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6787 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6788 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6789 [`os::unix::fs::DirBuilderExt`],
6790 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6791 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6792 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6793 [`collections::hash_map::Drain`],
6794 [`collections::hash_map::HashMap::drain`],
6795 [`collections::hash_set::Drain`],
6796 [`collections::hash_set::HashSet::drain`],
6797 [`collections::binary_heap::Drain`],
6798 [`collections::binary_heap::BinaryHeap::drain`],
6799 [`Vec::extend_from_slice`] (renamed from `push_all`),
6800 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6801 [`RwLock::into_inner`],
6802 [`Iterator::min_by_key`] (renamed from `min_by`),
6803 [`Iterator::max_by_key`] (renamed from `max_by`).
6804 * The [core library][1.6co] is stable, as are most of its APIs.
6805 * [The `assert_eq!` macro supports arguments that don't implement
6806 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6808 * Several timer functions that take duration in milliseconds [are
6809 deprecated in favor of those that take `Duration`][1.6ms]. These
6810 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6811 `thread::park_timeout_ms`.
6812 * The algorithm by which `Vec` reserves additional elements was
6813 [tweaked to not allocate excessive space][1.6a] while still growing
6815 * `From` conversions are [implemented from integers to floats][1.6f]
6816 in cases where the conversion is lossless. Thus they are not
6817 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6818 or `f64`. They are also not implemented for `isize` and `usize`
6819 because the implementations would be platform-specific. `From` is
6820 also implemented from `f32` to `f64`.
6821 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6822 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6823 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6824 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6826 * Sorting slices that are already sorted [is 50% faster in some
6832 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6833 * Cargo build scripts can specify their dependencies by emitting the
6834 [`rerun-if-changed`][1.6rr] key.
6835 * crates.io will reject publication of crates with dependencies that
6836 have a wildcard version constraint. Crates with wildcard
6837 dependencies were seen to cause a variety of problems, as described
6838 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6840 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6841 release folder. A variety of artifacts that Cargo failed to clean
6842 are now correctly deleted.
6847 * The `unreachable_code` lint [warns when a function call's argument
6849 * The parser indicates [failures that may be caused by
6850 confusingly-similar Unicode characters][1.6uc]
6851 * Certain macro errors [are reported at definition time][1.6m], not
6857 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6858 environment variable when locating crates. This was a pre-cargo
6859 feature for integrating with the package manager that was
6860 accidentally never removed.
6861 * [A number of bugs were fixed in the privacy checker][1.6p] that
6862 could cause previously-accepted code to break.
6863 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6864 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6865 struct pattern syntax (`Foo(..)`) can no longer be used to match
6866 unit structs. This is a warning now, but will become an error in
6867 future releases. Patterns that share the same name as a const are
6869 * A bug was fixed that causes [rustc not to apply default type
6870 parameters][1.6xc] when resolving certain method implementations of
6871 traits defined in other crates.
6873 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6874 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6875 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6876 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6877 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6878 [1.6co]: http://doc.rust-lang.org/core/index.html
6879 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6880 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6881 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6882 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6883 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6884 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6885 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6886 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6887 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6888 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6889 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6890 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6891 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6892 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6893 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6894 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6895 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6896 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6897 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6898 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6899 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6900 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6901 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6902 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6903 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6904 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6905 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6906 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6907 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6908 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6909 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6910 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6911 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6912 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6913 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6914 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6915 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6916 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6917 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6918 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6919 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6922 Version 1.5.0 (2015-12-10)
6923 ==========================
6925 * ~700 changes, numerous bugfixes
6931 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6932 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6933 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6934 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6935 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6936 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6937 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6938 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6939 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6940 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6941 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6942 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6943 [`Path::read_link`], [`Path::symlink_metadata`],
6944 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6945 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6946 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6947 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6948 [`slice::split_first_mut`], [`slice::split_first`],
6949 [`slice::split_last_mut`], [`slice::split_last`],
6950 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6951 [`str::MatchIndices`], [`str::RMatchIndices`],
6952 [`str::match_indices`], [`str::rmatch_indices`],
6953 [`str::slice_mut_unchecked`], [`string::ParseError`].
6954 * Rust applications hosted on crates.io can be installed locally to
6955 `~/.cargo/bin` with the [`cargo install`] command. Among other
6956 things this makes it easier to augment Cargo with new subcommands:
6957 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6958 invoked as `cargo foo`.
6959 * Crates with wildcard (`*`) dependencies will [emit warnings when
6960 published][1.5w]. In 1.6 it will no longer be possible to publish
6961 crates with wildcard dependencies.
6966 * The rules determining when a particular lifetime must outlive
6967 a particular value (known as '[dropck]') have been [modified
6968 to not rely on parametricity][1.5p].
6969 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6970 and `Arc`][1.5a]. Because these smart pointer types implement
6971 `Deref`, this causes breakage in cases where the interior type
6972 contains methods of the same name.
6973 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6974 that they could drop their content. Soundness fix.
6975 * All method invocations are [properly checked][1.5wf1] for
6976 [well-formedness][1.5wf2]. Soundness fix.
6977 * Traits whose supertraits contain `Self` are [not object
6978 safe][1.5o]. Soundness fix.
6979 * Target specifications support a [`no_default_libraries`][1.5nd]
6980 setting that controls whether `-nodefaultlibs` is passed to the
6981 linker, and in turn the `is_like_windows` setting no longer affects
6982 the `-nodefaultlibs` flag.
6983 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6984 * The `#[inline]` and `#[repr]` attributes [can only appear
6985 in valid locations][1.5at].
6986 * Native libraries linked from the local crate are [passed to
6987 the linker before native libraries from upstream crates][1.5nl].
6988 * Two rarely-used attributes, `#[no_debug]` and
6989 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6990 * Negation of unsigned integers, which has been a warning for
6991 several releases, [is now behind a feature gate and will
6992 generate errors][1.5nu].
6993 * The parser accidentally accepted visibility modifiers on
6994 enum variants, a bug [which has been fixed][1.5ev].
6995 * [A bug was fixed that allowed `use` statements to import unstable
7001 * When evaluating expressions at compile-time that are not
7002 compile-time constants (const-evaluating expressions in non-const
7003 contexts), incorrect code such as overlong bitshifts and arithmetic
7004 overflow will [generate a warning instead of an error][1.5ce],
7005 delaying the error until runtime. This will allow the
7006 const-evaluator to be expanded in the future backwards-compatibly.
7007 * The `improper_ctypes` lint [no longer warns about using `isize` and
7008 `usize` in FFI][1.5ict].
7013 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7015 * `Default` is [implemented for mutable slices][1.5d].
7016 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7017 * There are now `From` conversions [between floating point
7018 types][1.5f] where the conversions are lossless.
7019 * There are now `From` conversions [between integer types][1.5i] where
7020 the conversions are lossless.
7021 * [`fs::Metadata` implements `Clone`][1.5fs].
7022 * The `parse` method [accepts a leading "+" when parsing
7024 * [`AsMut` is implemented for `Vec`][1.5am].
7025 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7026 been optimized][1.5cf] and no longer rely on the default impl.
7027 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7028 `unsafe extern "C"` function types now [implement `Clone`,
7029 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7030 `fmt::Debug` for up to 12 arguments][1.5fp].
7031 * [Dropping `Vec`s is much faster in unoptimized builds when the
7032 element types don't implement `Drop`][1.5dv].
7033 * A bug that caused in incorrect behavior when [combining `VecDeque`
7034 with zero-sized types][1.5vdz] was resolved.
7035 * [`PartialOrd` for slices is faster][1.5po].
7040 * [Crate metadata size was reduced by 20%][1.5md].
7041 * [Improvements to code generation reduced the size of libcore by 3.3
7042 MB and rustc's memory usage by 18MB][1.5m].
7043 * [Improvements to deref translation increased performance in
7044 unoptimized builds][1.5dr].
7045 * Various errors in trait resolution [are deduplicated to only be
7046 reported once][1.5te].
7047 * Rust has preliminary [support for rumprun kernels][1.5rr].
7048 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7050 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7051 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7052 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7053 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7054 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7055 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7056 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7057 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7058 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7059 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7060 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7061 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7062 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7063 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7064 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7065 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7066 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7067 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7068 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7069 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7070 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7071 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7072 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7073 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7074 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7075 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7076 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7077 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7078 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7079 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7080 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7081 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7082 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7083 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7084 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7085 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7086 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7087 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7088 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7089 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7090 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7091 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7092 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7093 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7094 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7095 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7096 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7097 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7098 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7099 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7100 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7101 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7102 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7103 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7104 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7105 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7106 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7107 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7108 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7109 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7110 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7111 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7112 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7113 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7114 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7115 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7116 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7117 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7118 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7119 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7120 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7121 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7122 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7123 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7124 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7125 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7126 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7127 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7128 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7129 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7130 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7131 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7132 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7133 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7134 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7135 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7136 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7137 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7138 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7140 Version 1.4.0 (2015-10-29)
7141 ==========================
7143 * ~1200 changes, numerous bugfixes
7148 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7149 GNU) are now supported and recommended for use.
7154 * [Several changes have been made to fix type soundness and improve
7155 the behavior of associated types][sound]. See [RFC 1214]. Although
7156 we have mostly introduced these changes as warnings this release, to
7157 become errors next release, there are still some scenarios that will
7158 see immediate breakage.
7159 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7160 line breaks in addition to `\n`][crlf].
7161 * [Loans of `'static` lifetime extend to the end of a function][stat].
7162 * [`str::parse` no longer introduces avoidable rounding error when
7163 parsing floating point numbers. Together with earlier changes to
7164 float formatting/output, "round trips" like f.to_string().parse()
7165 now preserve the value of f exactly. Additionally, leading plus
7166 signs are now accepted][fp3].
7172 * `use` statements that import multiple items [can now rename
7173 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7174 * [Binops work correctly on fat pointers][binfat].
7175 * `pub extern crate`, which does not behave as expected, [issues a
7176 warning][pec] until a better solution is found.
7181 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7182 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7183 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7184 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7185 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7186 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7187 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7188 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7189 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7190 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7191 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7192 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7193 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7194 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7195 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7196 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7197 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7198 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7200 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7201 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7202 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7203 `f64::from_str_radix`.
7204 * [Reverse-searching strings is faster with the 'two-way'
7206 * [`std::io::copy` allows `?Sized` arguments][cc].
7207 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7208 [override `count`, `nth` and `last` with an O(1)
7209 implementation][it].
7210 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7211 * [`IntoRawFd` has been added to the Unix-specific prelude,
7212 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7214 * [`Extend<String>` and `FromIterator<String` are both implemented for
7216 * [`IntoIterator` is implemented for references to `Option` and
7218 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7219 Copy`][ext] as part of [RFC 839]. This will cause type inference
7220 breakage in rare situations.
7221 * [`BinaryHeap` implements `Debug`][bh2].
7222 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7224 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7225 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7226 * [String comparison is faster][faststr].
7227 * `&mut T` where `T: std::fmt::Write` [also implements
7228 `std::fmt::Write`][mutw].
7229 * [A stable regression in `VecDeque::push_back` and other
7230 capacity-altering methods that caused panics for zero-sized types
7232 * [Function pointers implement traits for up to 12 parameters][fp2].
7237 * The compiler [no longer uses the 'morestack' feature to prevent
7238 stack overflow][mm]. Instead it uses guard pages and stack
7239 probes (though stack probes are not yet implemented on any platform
7241 * [The compiler matches traits faster when projections are involved][p].
7242 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7244 * [Cargo now displays useful information about what its doing during
7245 `cargo update`][cu].
7247 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7248 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7249 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7250 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7251 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7252 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7253 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7254 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7255 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7256 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7257 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7258 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7259 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7260 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7261 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7262 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7263 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7264 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7265 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7266 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7267 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7268 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7269 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7270 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7271 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7272 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7273 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7274 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7275 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7276 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7277 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7278 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7279 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7280 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7281 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7282 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7283 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7284 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7285 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7286 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7287 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7288 [bh2]: https://github.com/rust-lang/rust/pull/28156
7289 [binfat]: https://github.com/rust-lang/rust/pull/28270
7290 [bm]: https://github.com/rust-lang/rust/pull/28197
7291 [cc]: https://github.com/rust-lang/rust/pull/27531
7292 [crlf]: https://github.com/rust-lang/rust/pull/28034
7293 [cu]: https://github.com/rust-lang/cargo/pull/1931
7294 [d]: https://github.com/rust-lang/rust/pull/27825
7295 [dep]: https://github.com/rust-lang/rust/pull/28339
7296 [es]: https://github.com/rust-lang/rust/pull/27956
7297 [ext]: https://github.com/rust-lang/rust/pull/28094
7298 [faststr]: https://github.com/rust-lang/rust/pull/28338
7299 [ffi]: https://github.com/rust-lang/rust/pull/28779
7300 [fp]: https://github.com/rust-lang/rust/pull/28268
7301 [fp2]: https://github.com/rust-lang/rust/pull/28560
7302 [fp3]: https://github.com/rust-lang/rust/pull/27307
7303 [i]: https://github.com/rust-lang/rust/pull/27451
7304 [into2]: https://github.com/rust-lang/rust/pull/28039
7305 [it]: https://github.com/rust-lang/rust/pull/27652
7306 [mm]: https://github.com/rust-lang/rust/pull/27338
7307 [mutw]: https://github.com/rust-lang/rust/pull/28368
7308 [sound]: https://github.com/rust-lang/rust/pull/27641
7309 [p]: https://github.com/rust-lang/rust/pull/27866
7310 [pec]: https://github.com/rust-lang/rust/pull/28486
7311 [pr]: https://github.com/rust-lang/rust/pull/27896
7312 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7313 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7314 [s]: https://github.com/rust-lang/rust/pull/27474
7315 [stab]: https://github.com/rust-lang/rust/pull/28339
7316 [stat]: https://github.com/rust-lang/rust/pull/28321
7317 [vd]: https://github.com/rust-lang/rust/pull/28494
7319 Version 1.3.0 (2015-09-17)
7320 ==============================
7322 * ~900 changes, numerous bugfixes
7327 * The [new object lifetime defaults][nold] have been [turned
7328 on][nold2] after a cycle of warnings about the change. Now types
7329 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7330 being interpreted as `&'a Box<Trait+'a>` to `&'a
7331 Box<Trait+'static>`.
7332 * [The Rustonomicon][nom] is a new book in the official documentation
7333 that dives into writing unsafe Rust.
7334 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7335 timekeeping is employed by other std APIs, as well as out-of-tree
7341 * The [new object lifetime defaults][nold] have been [turned
7342 on][nold2] after a cycle of warnings about the change.
7343 * There is a known [regression][lr] in how object lifetime elision is
7344 interpreted, the proper solution for which is undetermined.
7345 * The `#[prelude_import]` attribute, an internal implementation
7346 detail, was accidentally stabilized previously. [It has been put
7347 behind the `prelude_import` feature gate][pi]. This change is
7348 believed to break no existing code.
7349 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7350 [more sane for dynamically sized types][dst3]. Code that relied on
7351 the previous behavior is thought to be broken.
7352 * The `dropck` rules, which checks that destructors can't access
7353 destroyed values, [have been updated][dropck] to match the
7354 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7355 cause some previously-compiling code to no longer build.
7360 * The [new object lifetime defaults][nold] have been [turned
7361 on][nold2] after a cycle of warnings about the change.
7362 * Semicolons may [now follow types and paths in
7363 macros](https://github.com/rust-lang/rust/pull/27000).
7364 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7365 [more sane for dynamically sized types][dst3]. Code that relied on
7366 the previous behavior is not known to exist, and suspected to be
7368 * `'static` variables [may now be recursive][st].
7369 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7370 implementations correctly.
7371 * The `dropck` rules, which checks that destructors can't access
7372 destroyed values, [have been updated][dropck] to match the
7378 * The [`Duration`] API, [has been stabilized][ds], as well as the
7379 `std::time` module, which presently contains only `Duration`.
7380 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7381 * The owned C string, [`CString`], implements [`Borrow`] and the
7382 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7383 these allow C strings to be borrowed and cloned in generic code.
7384 * [`CStr`] implements [`Debug`].
7385 * [`AtomicPtr`] implements [`Debug`].
7386 * [`Error`] trait objects [can be downcast to their concrete types][e]
7387 in many common configurations, using the [`is`], [`downcast`],
7388 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7390 * Searching for substrings now [employs the two-way algorithm][search]
7391 instead of doing a naive search. This gives major speedups to a
7392 number of methods, including [`contains`][sc], [`find`][sf],
7393 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7394 [`ends_with`][sew] are also faster.
7395 * The performance of `PartialEq` for slices is [much faster][ps].
7396 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7397 is overridden and optimized by the implementations for scalars.
7398 * The [`Hasher`] trait now has a number of specialized `write_*`
7399 methods for primitive types, for efficiency.
7400 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7401 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7402 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7403 of [`std::error::Error::cause`][iec] also delegates to the inner
7405 * [`process::Child`][pc] gained the [`id`] method, which returns a
7406 `u32` representing the platform-specific process identifier.
7407 * The [`connect`] method on slices is deprecated, replaced by the new
7408 [`join`] method (note that both of these are on the *unstable*
7409 [`SliceConcatExt`] trait, but through the magic of the prelude are
7410 available to stable code anyway).
7411 * The [`Div`] operator is implemented for [`Wrapping`] types.
7412 * [`DerefMut` is implemented for `String`][dms].
7413 * Performance of SipHash (the default hasher for `HashMap`) is
7414 [better for long data][sh].
7415 * [`AtomicPtr`] implements [`Send`].
7416 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7417 are now [specialized to use uninitialized buffers for increased
7419 * Lifetime parameters of foreign functions [are now resolved
7425 * Rust can now, with some coercion, [produce programs that run on
7426 Windows XP][xp], though XP is not considered a supported platform.
7427 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7428 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7429 recommended for use in 1.3, though should be fully-functional
7430 in the [64-bit 1.4 beta][b14].
7431 * On Fedora-based systems installation will [properly configure the
7432 dynamic linker][fl].
7433 * The compiler gained many new extended error descriptions, which can
7434 be accessed with the `--explain` flag.
7435 * The `dropck` pass, which checks that destructors can't access
7436 destroyed values, [has been rewritten][dropck]. This fixes some
7437 soundness holes, and as such will cause some previously-compiling
7438 code to no longer build.
7439 * `rustc` now uses [LLVM to write archive files where possible][ar].
7440 Eventually this will eliminate the compiler's dependency on the ar
7442 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7443 supported FreeBSD on x86_64).
7444 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7445 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7447 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7448 will kill the process instead of leaking][nlp].
7450 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7451 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7452 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7453 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7454 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7455 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7456 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7457 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7458 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7459 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7460 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7461 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7462 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7463 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7464 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7465 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7466 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7467 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7468 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7469 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7470 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7471 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7472 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7473 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7474 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7475 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7476 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7477 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7478 [ar]: https://github.com/rust-lang/rust/pull/26926
7479 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7480 [dms]: https://github.com/rust-lang/rust/pull/26241
7481 [dropck]: https://github.com/rust-lang/rust/pull/27261
7482 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7483 [ds]: https://github.com/rust-lang/rust/pull/26818
7484 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7485 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7486 [dst3]: https://github.com/rust-lang/rust/pull/27351
7487 [e]: https://github.com/rust-lang/rust/pull/24793
7488 [f]: https://github.com/rust-lang/rust/pull/26588
7489 [fb]: https://github.com/rust-lang/rust/pull/26959
7490 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7491 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7492 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7493 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7494 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7495 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7496 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7497 [lic]: https://github.com/rust-lang/rust/pull/26583
7498 [lnu]: https://github.com/rust-lang/rust/pull/27026
7499 [lr]: https://github.com/rust-lang/rust/issues/27248
7500 [lum]: https://github.com/rust-lang/rust/pull/26378
7501 [lur]: https://github.com/rust-lang/rust/pull/26783
7502 [nlp]: https://github.com/rust-lang/rust/pull/27176
7503 [nold2]: https://github.com/rust-lang/rust/pull/27045
7504 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7505 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7506 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7507 [pi]: https://github.com/rust-lang/rust/pull/26699
7508 [ps]: https://github.com/rust-lang/rust/pull/26884
7509 [rte]: https://github.com/rust-lang/rust/pull/26950
7510 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7511 [search]: https://github.com/rust-lang/rust/pull/26327
7512 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7513 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7514 [sh]: https://github.com/rust-lang/rust/pull/27280
7515 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7516 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7517 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7518 [st]: https://github.com/rust-lang/rust/pull/26630
7519 [win1]: https://github.com/rust-lang/rust/pull/26569
7520 [win2]: https://github.com/rust-lang/rust/pull/26741
7521 [win3]: https://github.com/rust-lang/rust/pull/26741
7522 [win4]: https://github.com/rust-lang/rust/pull/27210
7523 [xp]: https://github.com/rust-lang/rust/pull/26569
7525 Version 1.2.0 (2015-08-07)
7526 ==========================
7528 * ~1200 changes, numerous bugfixes
7533 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7534 like `Rc` to contain types without a fixed size, arrays and trait
7535 objects, finally enabling use of `Rc<[T]>` and completing the
7536 implementation of DST.
7537 * [Parallel codegen][parcodegen] is now working again, which can
7538 substantially speed up large builds in debug mode; It also gets
7539 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7540 jobs). It's not enabled by default, but will be "in the near
7541 future". It can be activated with the `-C codegen-units=N` flag to
7543 * This is the first release with [experimental support for linking
7544 with the MSVC linker and lib C on Windows (instead of using the GNU
7545 variants via MinGW)][win]. It is yet recommended only for the most
7546 intrepid Rustaceans.
7547 * Benchmark compilations are showing a 30% improvement in
7548 bootstrapping over 1.1.
7553 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7554 unicode case mapping, which is a previously-planned change in
7555 behavior and considered a bugfix.
7556 * [`mem::align_of`] now specifies [the *minimum alignment* for
7557 T][align], which is usually the alignment programs are interested
7558 in, and the same value reported by clang's
7559 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7561 * [The `#[packed]` attribute is no longer silently accepted by the
7562 compiler][packed]. This attribute did nothing and code that
7563 mentioned it likely did not work as intended.
7564 * Associated type defaults are [now behind the
7565 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7566 defaults *did not work*, but could be mentioned syntactically. As
7567 such this breakage has minimal impact.
7572 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7573 matching against dereferenceable values.
7578 * The [`Extend`] trait, which grows a collection from an iterator, is
7579 implemented over iterators of references, for `String`, `Vec`,
7580 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7581 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7582 * The [`iter::once`] function returns an iterator that yields a single
7583 element, and [`iter::empty`] returns an iterator that yields no
7585 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7586 over substring matches.
7587 * [`Cell`] and [`RefCell`] both implement `Eq`.
7588 * A number of methods for wrapping arithmetic are added to the
7589 integral types, [`wrapping_div`], [`wrapping_rem`],
7590 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7591 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7592 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7593 type.. It is illegal for the default arithmetic operations in Rust
7594 to overflow; the desire to wrap must be explicit.
7595 * The `{:#?}` formatting specifier [displays the alternate,
7596 pretty-printed][debugfmt] form of the `Debug` formatter. This
7597 feature was actually introduced prior to 1.0 with little
7599 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7600 for writing data to formatted strings, similar to [`io::Write`].
7601 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7602 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7603 are used by code generators to emit implementations of [`Debug`].
7604 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7605 methods that convert case, following Unicode case mapping.
7606 * It is now easier to handle poisoned locks. The [`PoisonError`]
7607 type, returned by failing lock operations, exposes `into_inner`,
7608 `get_ref`, and `get_mut`, which all give access to the inner lock
7609 guard, and allow the poisoned lock to continue to operate. The
7610 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7611 poisoned lock without attempting to take the lock.
7612 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7613 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7614 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7615 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7617 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7623 * `rustc` employs smarter heuristics for guessing at [typos].
7624 * `rustc` emits more efficient code for [no-op conversions between
7625 unsafe pointers][nop].
7626 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7627 resulting in faster compile times and smaller code.
7629 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7630 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7631 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7632 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7633 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7634 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7635 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7636 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7637 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7638 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7639 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7640 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7641 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7642 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7643 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7644 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7645 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7646 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7647 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7648 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7649 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7650 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7651 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7652 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7653 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7654 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7655 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7656 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7657 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7658 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7659 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7660 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7661 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7662 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7663 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7664 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7665 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7666 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7667 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7668 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7669 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7670 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7671 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7672 [align]: https://github.com/rust-lang/rust/pull/25646
7673 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7674 [typos]: https://github.com/rust-lang/rust/pull/26087
7675 [nop]: https://github.com/rust-lang/rust/pull/26336
7676 [fat]: https://github.com/rust-lang/rust/pull/26411
7677 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7678 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7679 [packed]: https://github.com/rust-lang/rust/pull/25541
7680 [ad]: https://github.com/rust-lang/rust/pull/27382
7681 [win]: https://github.com/rust-lang/rust/pull/25350
7683 Version 1.1.0 (2015-06-25)
7684 =========================
7686 * ~850 changes, numerous bugfixes
7691 * The [`std::fs` module has been expanded][fs] to expand the set of
7692 functionality exposed:
7693 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7694 don't incur a syscall on some platforms.
7695 * A `symlink_metadata` function has been added.
7696 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7697 access to all underlying information.
7698 * The compiler now contains extended explanations of many errors. When an error
7699 with an explanation occurs the compiler suggests using the `--explain` flag
7700 to read the explanation. Error explanations are also [available online][err-index].
7701 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7702 well as other work, the time to bootstrap the compiler decreased by
7708 * The [`str::split_whitespace`] method splits a string on unicode
7709 whitespace boundaries.
7710 * On both Windows and Unix, new extension traits provide conversion of
7711 I/O types to and from the underlying system handles. On Unix, these
7712 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7713 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7714 `TcpListener`, and `UpdSocket`. Further implementations for
7715 `std::process` will be stabilized later.
7716 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7717 Windows, symlinks can be created with
7718 `std::os::windows::symlink_dir` and
7719 `std::os::windows::symlink_file`.
7720 * The `mpsc::Receiver` type can now be converted into an iterator with
7721 `into_iter` on the [`IntoIterator`] trait.
7722 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7723 implementation of the [`From`] trait.
7724 * The `Debug` implementation for `RangeFull` [creates output that is
7725 more consistent with other implementations][rf].
7726 * [`Debug` is implemented for `File`][file].
7727 * The `Default` implementation for `Arc` [no longer requires `Sync +
7729 * [The `Iterator` methods `count`, `nth`, and `last` have been
7730 overridden for slices to have O(1) performance instead of O(n)][si].
7731 * Incorrect handling of paths on Windows has been improved in both the
7732 compiler and the standard library.
7733 * [`AtomicPtr` gained a `Default` implementation][ap].
7734 * In accordance with Rust's policy on arithmetic overflow `abs` now
7735 [panics on overflow when debug assertions are enabled][abs].
7736 * The [`Cloned`] iterator, which was accidentally left unstable for
7737 1.0 [has been stabilized][c].
7738 * The [`Incoming`] iterator, which iterates over incoming TCP
7739 connections, and which was accidentally unnamable in 1.0, [is now
7740 properly exported][inc].
7741 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7742 `sift_up` or `sift_down` panic][bh].
7743 * The [`split_off`] method of `LinkedList` [no longer corrupts
7744 the list in certain scenarios][ll].
7749 * Type checking performance [has improved notably][sk] with
7750 [multiple improvements][pre].
7751 * The compiler [suggests code changes][ch] for more errors.
7752 * rustc and it's build system have experimental support for [building
7753 toolchains against MUSL][m] instead of glibc on Linux.
7754 * The compiler defines the `target_env` cfg value, which is used for
7755 distinguishing toolchains that are otherwise for the same
7756 platform. Presently this is set to `gnu` for common GNU Linux
7757 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7758 * The [`cargo rustc`][crc] command invokes a build with custom flags
7760 * [Android executables are always position independent][pie].
7761 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7764 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7765 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7766 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7767 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7768 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7769 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7770 [rf]: https://github.com/rust-lang/rust/pull/24491
7771 [err-index]: https://doc.rust-lang.org/error-index.html
7772 [sk]: https://github.com/rust-lang/rust/pull/24615
7773 [pre]: https://github.com/rust-lang/rust/pull/25323
7774 [file]: https://github.com/rust-lang/rust/pull/24598
7775 [ch]: https://github.com/rust-lang/rust/pull/24683
7776 [arc]: https://github.com/rust-lang/rust/pull/24695
7777 [si]: https://github.com/rust-lang/rust/pull/24701
7778 [ap]: https://github.com/rust-lang/rust/pull/24834
7779 [m]: https://github.com/rust-lang/rust/pull/24777
7780 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7781 [crc]: https://github.com/rust-lang/cargo/pull/1568
7782 [pie]: https://github.com/rust-lang/rust/pull/24953
7783 [abs]: https://github.com/rust-lang/rust/pull/25441
7784 [c]: https://github.com/rust-lang/rust/pull/25496
7785 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7786 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7787 [inc]: https://github.com/rust-lang/rust/pull/25522
7788 [bh]: https://github.com/rust-lang/rust/pull/25856
7789 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7790 [ll]: https://github.com/rust-lang/rust/pull/26022
7791 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7792 [drop]: https://github.com/rust-lang/rust/pull/24935
7794 Version 1.0.0 (2015-05-15)
7795 ========================
7797 * ~1500 changes, numerous bugfixes
7802 * The vast majority of the standard library is now `#[stable]`. It is
7803 no longer possible to use unstable features with a stable build of
7805 * Many popular crates on [crates.io] now work on the stable release
7807 * Arithmetic on basic integer types now [checks for overflow in debug
7813 * Several [restrictions have been added to trait coherence][coh] in
7814 order to make it easier for upstream authors to change traits
7815 without breaking downstream code.
7816 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7817 improve error messages and macro behavior. For example, `0b1234` is
7818 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7819 * Trait bounds [are always invariant][inv], eliminating the need for
7820 the `PhantomFn` and `MarkerTrait` lang items, which have been
7822 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7823 "foo" as bar` syntax has been replaced with `extern crate foo as
7824 bar`, and Cargo now automatically translates "-" in *package* names
7825 to underscore for the crate name.
7826 * [Lifetime shadowing is an error][lt].
7827 * [`Send` no longer implies `'static`][send-rfc].
7828 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7829 `MyType::default()`.
7830 * Primitive types [now have inherent methods][prim-inherent],
7831 obviating the need for extension traits like `SliceExt`.
7832 * Methods with `Self: Sized` in their `where` clause are [considered
7833 object-safe][self-sized], allowing many extension traits like
7834 `IteratorExt` to be merged into the traits they extended.
7835 * You can now [refer to associated types][assoc-where] whose
7836 corresponding trait bounds appear only in a `where` clause.
7837 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7838 like `Send` and `Sync` are now library-defined.
7839 * A [Reflect trait][reflect] was introduced, which means that
7840 downcasting via the `Any` trait is effectively limited to concrete
7841 types. This helps retain the potentially-important "parametricity"
7842 property: generic code cannot behave differently for different type
7843 arguments except in minor ways.
7844 * The `unsafe_destructor` feature is now deprecated in favor of the
7845 [new `dropck`][dropck]. This change is a major reduction in unsafe
7851 * The `thread_local` module [has been renamed to `std::thread`][th].
7852 * The methods of `IteratorExt` [have been moved to the `Iterator`
7854 * Several traits that implement Rust's conventions for type
7855 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7856 [centralized in the `std::convert` module][con].
7857 * The `FromError` trait [was removed in favor of `From`][fe].
7858 * The basic sleep function [has moved to
7859 `std::thread::sleep_ms`][slp].
7860 * The `splitn` function now takes an `n` parameter that represents the
7861 number of items yielded by the returned iterator [instead of the
7862 number of 'splits'][spl].
7863 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7864 * [Derived implementations of `PartialOrd` now order enums according
7865 to their explicitly-assigned discriminants][po].
7866 * [Methods for searching strings are generic over `Pattern`s][pat],
7867 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7869 * [In method resolution, object methods are resolved before inherent
7871 * [`String::from_str` has been deprecated in favor of the `From` impl,
7872 `String::from`][sf].
7873 * [`io::Error` implements `Sync`][ios].
7874 * [The `words` method on `&str` has been replaced with
7875 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7877 * The new path and IO modules are complete and `#[stable]`. This
7878 was the major library focus for this cycle.
7879 * The path API was [revised][path-normalize] to normalize `.`,
7880 adjusting the tradeoffs in favor of the most common usage.
7881 * A large number of remaining APIs in `std` were also stabilized
7882 during this cycle; about 75% of the non-deprecated API surface
7884 * The new [string pattern API][string-pattern] landed, which makes
7885 the string slice API much more internally consistent and flexible.
7886 * A new set of [generic conversion traits][conversion] replaced
7887 many existing ad hoc traits.
7888 * Generic numeric traits were [completely removed][num-traits]. This
7889 was made possible thanks to inherent methods for primitive types,
7890 and the removal gives maximal flexibility for designing a numeric
7891 hierarchy in the future.
7892 * The `Fn` traits are now related via [inheritance][fn-inherit]
7893 and provide ergonomic [blanket implementations][fn-blanket].
7894 * The `Index` and `IndexMut` traits were changed to
7895 [take the index by value][index-value], enabling code like
7896 `hash_map["string"]` to work.
7897 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7898 `Copy` data is known to be `Clone` as well.
7903 * Many errors now have extended explanations that can be accessed with
7904 the `--explain` flag to `rustc`.
7905 * Many new examples have been added to the standard library
7907 * rustdoc has received a number of improvements focused on completion
7909 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7910 * Much headway was made on ecosystem-wide CI, making it possible
7911 to [compare builds for breakage][ci-compare].
7914 [crates.io]: http://crates.io
7915 [clo]: https://github.com/rust-lang/rust/pull/24034
7916 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7917 [con]: https://github.com/rust-lang/rust/pull/23875
7918 [cr]: https://github.com/rust-lang/rust/pull/23419
7919 [fe]: https://github.com/rust-lang/rust/pull/23879
7920 [ie]: https://github.com/rust-lang/rust/pull/23300
7921 [inv]: https://github.com/rust-lang/rust/pull/23938
7922 [ios]: https://github.com/rust-lang/rust/pull/24133
7923 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7924 [lt]: https://github.com/rust-lang/rust/pull/24057
7925 [meth]: https://github.com/rust-lang/rust/pull/24056
7926 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7927 [po]: https://github.com/rust-lang/rust/pull/24270
7928 [sf]: https://github.com/rust-lang/rust/pull/24517
7929 [slp]: https://github.com/rust-lang/rust/pull/23949
7930 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7931 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7932 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7933 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7934 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7935 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7936 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7937 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7938 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7939 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7940 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7941 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7942 [reflect]: https://github.com/rust-lang/rust/pull/23712
7943 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7944 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7945 [index-value]: https://github.com/rust-lang/rust/pull/23601
7946 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7947 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7948 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7949 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7950 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7951 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7954 Version 1.0.0-alpha.2 (2015-02-20)
7955 =====================================
7957 * ~1300 changes, numerous bugfixes
7961 * The various I/O modules were [overhauled][io-rfc] to reduce
7962 unnecessary abstractions and provide better interoperation with
7963 the underlying platform. The old `io` module remains temporarily
7965 * The standard library now [participates in feature gating][feat],
7966 so use of unstable libraries now requires a `#![feature(...)]`
7967 attribute. The impact of this change is [described on the
7968 forum][feat-forum]. [RFC][feat-rfc].
7972 * `for` loops [now operate on the `IntoIterator` trait][into],
7973 which eliminates the need to call `.iter()`, etc. to iterate
7974 over collections. There are some new subtleties to remember
7975 though regarding what sort of iterators various types yield, in
7976 particular that `for foo in bar { }` yields values from a move
7977 iterator, destroying the original collection. [RFC][into-rfc].
7978 * Objects now have [default lifetime bounds][obj], so you don't
7979 have to write `Box<Trait+'static>` when you don't care about
7980 storing references. [RFC][obj-rfc].
7981 * In types that implement `Drop`, [lifetimes must outlive the
7982 value][drop]. This will soon make it possible to safely
7983 implement `Drop` for types where `#[unsafe_destructor]` is now
7984 required. Read the [gorgeous RFC][drop-rfc] for details.
7985 * The fully qualified <T as Trait>::X syntax lets you set the Self
7986 type for a trait method or associated type. [RFC][ufcs-rfc].
7987 * References to types that implement `Deref<U>` now [automatically
7988 coerce to references][deref] to the dereferenced type `U`,
7989 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7990 should eliminate many unsightly uses of `&*`, as when converting
7991 from references to vectors into references to
7992 slices. [RFC][deref-rfc].
7993 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7994 `|:|`) is obsolete and closure kind is inferred from context.
7995 * [`Self` is a keyword][Self].
7999 * The `Show` and `String` formatting traits [have been
8000 renamed][fmt] to `Debug` and `Display` to more clearly reflect
8001 their related purposes. Automatically getting a string
8002 conversion to use with `format!("{:?}", something_to_debug)` is
8003 now written `#[derive(Debug)]`.
8004 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
8005 OsStr}`, provide strings in platform-specific encodings for easier
8006 interop with system APIs. [RFC][osstr-rfc].
8007 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8008 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8009 creating raw pointers.
8013 * Certain long error messages of the form 'expected foo found bar'
8014 are now [split neatly across multiple
8015 lines][multiline]. Examples in the PR.
8016 * On Unix Rust can be [uninstalled][un] by running
8017 `/usr/local/lib/rustlib/uninstall.sh`.
8018 * The `#[rustc_on_unimplemented]` attribute, requiring the
8019 'on_unimplemented' feature, lets rustc [display custom error
8020 messages when a trait is expected to be implemented for a type
8025 * Rust is tested against a [LALR grammar][lalr], which parses
8026 almost all the Rust files that rustc does.
8028 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8029 [close]: https://github.com/rust-lang/rust/pull/21843
8030 [deref]: https://github.com/rust-lang/rust/pull/21351
8031 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8032 [drop]: https://github.com/rust-lang/rust/pull/21972
8033 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8034 [feat]: https://github.com/rust-lang/rust/pull/21248
8035 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8036 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8037 [fmt]: https://github.com/rust-lang/rust/pull/21457
8038 [into]: https://github.com/rust-lang/rust/pull/20790
8039 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8040 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8041 [lalr]: https://github.com/rust-lang/rust/pull/21452
8042 [multiline]: https://github.com/rust-lang/rust/pull/19870
8043 [obj]: https://github.com/rust-lang/rust/pull/22230
8044 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8045 [onun]: https://github.com/rust-lang/rust/pull/20889
8046 [osstr]: https://github.com/rust-lang/rust/pull/21488
8047 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8048 [Self]: https://github.com/rust-lang/rust/pull/22158
8049 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8050 [un]: https://github.com/rust-lang/rust/pull/22256
8053 Version 1.0.0-alpha (2015-01-09)
8054 ==================================
8056 * ~2400 changes, numerous bugfixes
8060 * The language itself is considered feature complete for 1.0,
8061 though there will be many usability improvements and bugfixes
8062 before the final release.
8063 * Nearly 50% of the public API surface of the standard library has
8064 been declared 'stable'. Those interfaces are unlikely to change
8066 * The long-running debate over integer types has been
8067 [settled][ints]: Rust will ship with types named `isize` and
8068 `usize`, rather than `int` and `uint`, for pointer-sized
8069 integers. Guidelines will be rolled out during the alpha cycle.
8070 * Most crates that are not `std` have been moved out of the Rust
8071 distribution into the Cargo ecosystem so they can evolve
8072 separately and don't need to be stabilized as quickly, including
8073 'time', 'getopts', 'num', 'regex', and 'term'.
8074 * Documentation continues to be expanded with more API coverage, more
8075 examples, and more in-depth explanations. The guides have been
8076 consolidated into [The Rust Programming Language][trpl].
8077 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8078 * All official Rust binary installers now come with [Cargo], the
8079 Rust package manager.
8083 * Closures have been [completely redesigned][unboxed] to be
8084 implemented in terms of traits, can now be used as generic type
8085 bounds and thus monomorphized and inlined, or via an opaque
8086 pointer (boxed) as in the old system. The new system is often
8087 referred to as 'unboxed' closures.
8088 * Traits now support [associated types][assoc], allowing families
8089 of related types to be defined together and used generically in
8091 * Enum variants are [namespaced by their type names][enum].
8092 * [`where` clauses][where] provide a more versatile and attractive
8093 syntax for specifying generic bounds, though the previous syntax
8095 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8097 * Rust [no longer has a runtime][rt] of any description, and only
8098 supports OS threads, not green threads.
8099 * At long last, Rust has been overhauled for 'dynamically-sized
8100 types' ([DST]), which integrates 'fat pointers' (object types,
8101 arrays, and `str`) more deeply into the type system, making it
8103 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8104 `..j` that produce range types and which, when combined with the
8105 `Index` operator and multidispatch, leads to a convenient slice
8107 * The new range syntax revealed an ambiguity in the fixed-length
8108 array syntax, so now fixed length arrays [are written `[T;
8110 * The `Copy` trait is no longer implemented automatically. Unsafe
8111 pointers no longer implement `Sync` and `Send` so types
8112 containing them don't automatically either. `Sync` and `Send`
8113 are now 'unsafe traits' so one can "forcibly" implement them via
8114 `unsafe impl` if a type confirms to the requirements for them
8115 even though the internals do not (e.g. structs containing unsafe
8116 pointers like `Arc`). These changes are intended to prevent some
8117 footguns and are collectively known as [opt-in built-in
8118 traits][oibit] (though `Sync` and `Send` will soon become pure
8119 library types unknown to the compiler).
8120 * Operator traits now take their operands [by value][ops], and
8121 comparison traits can use multidispatch to compare one type
8122 against multiple other types, allowing e.g. `String` to be
8123 compared with `&str`.
8124 * `if let` and `while let` are no longer feature-gated.
8125 * Rust has adopted a more [uniform syntax for escaping unicode
8126 characters][unicode].
8127 * `macro_rules!` [has been declared stable][mac]. Though it is a
8128 flawed system it is sufficiently popular that it must be usable
8129 for 1.0. Effort has gone into [future-proofing][mac-future] it
8130 in ways that will allow other macro systems to be developed in
8131 parallel, and won't otherwise impact the evolution of the
8133 * The prelude has been [pared back significantly][prelude] such
8134 that it is the minimum necessary to support the most pervasive
8135 code patterns, and through [generalized where clauses][where]
8136 many of the prelude extension traits have been consolidated.
8137 * Rust's rudimentary reflection [has been removed][refl], as it
8138 incurred too much code generation for little benefit.
8139 * [Struct variants][structvars] are no longer feature-gated.
8140 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8141 known as 'higher-ranked trait bounds', this crucially allows
8142 unboxed closures to work.
8143 * Macros invocations surrounded by parens or square brackets and
8144 not terminated by a semicolon are [parsed as
8145 expressions][macros], which makes expressions like `vec![1i32,
8146 2, 3].len()` work as expected.
8147 * Trait objects now implement their traits automatically, and
8148 traits that can be coerced to objects now must be [object
8150 * Automatically deriving traits is now done with `#[derive(...)]`
8151 not `#[deriving(...)]` for [consistency with other naming
8152 conventions][derive].
8153 * Importing the containing module or enum at the same time as
8154 items or variants they contain is [now done with `self` instead
8155 of `mod`][self], as in use `foo::{self, bar}`
8156 * Glob imports are no longer feature-gated.
8157 * The `box` operator and `box` patterns have been feature-gated
8158 pending a redesign. For now unique boxes should be allocated
8159 like other containers, with `Box::new`.
8163 * A [series][coll1] of [efforts][coll2] to establish
8164 [conventions][coll3] for collections types has resulted in API
8165 improvements throughout the standard library.
8166 * New [APIs for error handling][err] provide ergonomic interop
8167 between error types, and [new conventions][err-conv] describe
8168 more clearly the recommended error handling strategies in Rust.
8169 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8170 it is easier to discuss failure in the context of error handling
8171 without making clarifications as to whether you are referring to
8172 the 'fail' macro or failure more generally.
8173 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8174 syscall when available.
8175 * The 'serialize' crate has been renamed 'rustc-serialize' and
8176 moved out of the distribution to Cargo. Although it is widely
8177 used now, it is expected to be superseded in the near future.
8178 * The `Show` formatter, typically implemented with
8179 `#[derive(Show)]` is [now requested with the `{:?}`
8180 specifier][show] and is intended for use by all types, for uses
8181 such as `println!` debugging. The new `String` formatter must be
8182 implemented by hand, uses the `{}` specifier, and is intended
8183 for full-fidelity conversions of things that can logically be
8184 represented as strings.
8188 * [Flexible target specification][flex] allows rustc's code
8189 generation to be configured to support otherwise-unsupported
8191 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8192 respective debuggers with Rust-appropriate pretty-printing.
8193 * The Windows installation of Rust is distributed with the
8194 MinGW components currently required to link binaries on that
8199 * Nullable enum optimizations have been extended to more types so
8200 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8201 space than the inner types themselves.
8202 * Work has begun on supporting AArch64.
8204 [Cargo]: https://crates.io
8205 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8206 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8207 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8208 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8209 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8210 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8211 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8212 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8213 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8214 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8215 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8216 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8217 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8218 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8219 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8220 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8221 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8222 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8223 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8224 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8225 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8226 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8227 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8228 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8229 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8230 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8231 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8232 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8233 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8234 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8235 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8236 [trpl]: https://doc.rust-lang.org/book/index.html
8237 [rbe]: http://rustbyexample.com/
8240 Version 0.12.0 (2014-10-09)
8241 =============================
8243 * ~1900 changes, numerous bugfixes
8247 * The introductory documentation (now called The Rust Guide) has
8248 been completely rewritten, as have a number of supplementary
8250 * Rust's package manager, Cargo, continues to improve and is
8251 sometimes considered to be quite awesome.
8252 * Many API's in `std` have been reviewed and updated for
8253 consistency with the in-development Rust coding
8254 guidelines. The standard library documentation tracks
8255 stabilization progress.
8256 * Minor libraries have been moved out-of-tree to the rust-lang org
8257 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8258 be installed with Cargo.
8259 * Lifetime elision allows lifetime annotations to be left off of
8260 function declarations in many common scenarios.
8261 * Rust now works on 64-bit Windows.
8264 * Indexing can be overloaded with the `Index` and `IndexMut`
8266 * The `if let` construct takes a branch only if the `let` pattern
8267 matches, currently behind the 'if_let' feature gate.
8268 * 'where clauses', a more flexible syntax for specifying trait
8269 bounds that is more aesthetic, have been added for traits and
8270 free functions. Where clauses will in the future make it
8271 possible to constrain associated types, which would be
8272 impossible with the existing syntax.
8273 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8274 the 'slicing_syntax' feature gate, and can be overloaded with
8275 the `Slice` or `SliceMut` traits.
8276 * The syntax for matching of sub-slices has been changed to use a
8277 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8278 consistency with other uses of `..` and to future-proof
8279 potential additional uses of the syntax.
8280 * The syntax for matching inclusive ranges in patterns has changed
8281 from `0..3` to `0...4` to be consistent with the exclusive range
8283 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8284 c]`) has been put behind the 'advanced_slice_patterns' feature
8285 gate and may be removed in the future.
8286 * Components of tuples and tuple structs can be extracted using
8287 the `value.0` syntax, currently behind the `tuple_indexing`
8289 * The `#[crate_id]` attribute is no longer supported; versioning
8290 is handled by the package manager.
8291 * Renaming crate imports are now written `extern crate foo as bar`
8292 instead of `extern crate bar = foo`.
8293 * Renaming use statements are now written `use foo as bar` instead
8295 * `let` and `match` bindings and argument names in macros are now
8297 * The new, more efficient, closure types ('unboxed closures') have
8298 been added under a feature gate, 'unboxed_closures'. These will
8299 soon replace the existing closure types, once higher-ranked
8300 trait lifetimes are added to the language.
8301 * `move` has been added as a keyword, for indicating closures
8302 that capture by value.
8303 * Mutation and assignment is no longer allowed in pattern guards.
8304 * Generic structs and enums can now have trait bounds.
8305 * The `Share` trait is now called `Sync` to free up the term
8306 'shared' to refer to 'shared reference' (the default reference
8308 * Dynamically-sized types have been mostly implemented,
8309 unifying the behavior of fat-pointer types with the rest of the
8311 * As part of dynamically-sized types, the `Sized` trait has been
8312 introduced, which qualifying types implement by default, and
8313 which type parameters expect by default. To specify that a type
8314 parameter does not need to be sized, write `<Sized? T>`. Most
8315 types are `Sized`, notable exceptions being unsized arrays
8316 (`[T]`) and trait types.
8317 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8318 * Lifetime bounds can now be applied to type parameters and object
8320 * The old, reference counted GC type, `Gc<T>` which was once
8321 denoted by the `@` sigil, has finally been removed. GC will be
8322 revisited in the future.
8325 * Library documentation has been improved for a number of modules.
8326 * Bit-vectors, collections::bitv has been modernized.
8327 * The url crate is deprecated in favor of
8328 http://github.com/servo/rust-url, which can be installed with
8330 * Most I/O stream types can be cloned and subsequently closed from
8332 * A `std::time::Duration` type has been added for use in I/O
8333 methods that rely on timers, as well as in the 'time' crate's
8334 `Timespec` arithmetic.
8335 * The runtime I/O abstraction layer that enabled the green thread
8336 scheduler to do non-thread-blocking I/O has been removed, along
8337 with the libuv-based implementation employed by the green thread
8338 scheduler. This will greatly simplify the future I/O work.
8339 * `collections::btree` has been rewritten to have a more
8340 idiomatic and efficient design.
8343 * rustdoc output now indicates the stability levels of API's.
8344 * The `--crate-name` flag can specify the name of the crate
8345 being compiled, like `#[crate_name]`.
8346 * The `-C metadata` specifies additional metadata to hash into
8347 symbol names, and `-C extra-filename` specifies additional
8348 information to put into the output filename, for use by the
8349 package manager for versioning.
8350 * debug info generation has continued to improve and should be
8351 more reliable under both gdb and lldb.
8352 * rustc has experimental support for compiling in parallel
8353 using the `-C codegen-units` flag.
8354 * rustc no longer encodes rpath information into binaries by
8358 * Stack usage has been optimized with LLVM lifetime annotations.
8359 * Official Rust binaries on Linux are more compatible with older
8360 kernels and distributions, built on CentOS 5.10.
8363 Version 0.11.0 (2014-07-02)
8364 ==========================
8366 * ~1700 changes, numerous bugfixes
8369 * ~[T] has been removed from the language. This type is superseded by
8371 * ~str has been removed from the language. This type is superseded by
8373 * ~T has been removed from the language. This type is superseded by the
8375 * @T has been removed from the language. This type is superseded by the
8376 standard library's std::gc::Gc<T> type.
8377 * Struct fields are now all private by default.
8378 * Vector indices and shift amounts are both required to be a `uint`
8379 instead of any integral type.
8380 * Byte character, byte string, and raw byte string literals are now all
8381 supported by prefixing the normal literal with a `b`.
8382 * Multiple ABIs are no longer allowed in an ABI string
8383 * The syntax for lifetimes on closures/procedures has been tweaked
8384 slightly: `<'a>|A, B|: 'b + K -> T`
8385 * Floating point modulus has been removed from the language; however it
8386 is still provided by a library implementation.
8387 * Private enum variants are now disallowed.
8388 * The `priv` keyword has been removed from the language.
8389 * A closure can no longer be invoked through a &-pointer.
8390 * The `use foo, bar, baz;` syntax has been removed from the language.
8391 * The transmute intrinsic no longer works on type parameters.
8392 * Statics now allow blocks/items in their definition.
8393 * Trait bounds are separated from objects with + instead of : now.
8394 * Objects can no longer be read while they are mutably borrowed.
8395 * The address of a static is now marked as insignificant unless the
8396 #[inline(never)] attribute is placed it.
8397 * The #[unsafe_destructor] attribute is now behind a feature gate.
8398 * Struct literals are no longer allowed in ambiguous positions such as
8399 if, while, match, and for..in.
8400 * Declaration of lang items and intrinsics are now feature-gated by
8402 * Integral literals no longer default to `int`, and floating point
8403 literals no longer default to `f64`. Literals must be suffixed with an
8404 appropriate type if inference cannot determine the type of the
8406 * The Box<T> type is no longer implicitly borrowed to &mut T.
8407 * Procedures are now required to not capture borrowed references.
8410 * The standard library is now a "facade" over a number of underlying
8411 libraries. This means that development on the standard library should
8412 be speedier due to smaller crates, as well as a clearer line between
8414 * A new library, libcore, lives under the standard library's facade
8415 which is Rust's "0-assumption" library, suitable for embedded and
8416 kernel development for example.
8417 * A regex crate has been added to the standard distribution. This crate
8418 includes statically compiled regular expressions.
8419 * The unwrap/unwrap_err methods on Result require a Show bound for
8420 better error messages.
8421 * The return types of the std::comm primitives have been centralized
8422 around the Result type.
8423 * A number of I/O primitives have gained the ability to time out their
8425 * A number of I/O primitives have gained the ability to close their
8426 reading/writing halves to cancel pending operations.
8427 * Reverse iterator methods have been removed in favor of `rev()` on
8428 their forward-iteration counterparts.
8429 * A bitflags! macro has been added to enable easy interop with C and
8430 management of bit flags.
8431 * A debug_assert! macro is now provided which is disabled when
8432 `--cfg ndebug` is passed to the compiler.
8433 * A graphviz crate has been added for creating .dot files.
8434 * The std::cast module has been migrated into std::mem.
8435 * The std::local_data api has been migrated from freestanding functions
8436 to being based on methods.
8437 * The Pod trait has been renamed to Copy.
8438 * jemalloc has been added as the default allocator for types.
8439 * The API for allocating memory has been changed to use proper alignment
8440 and sized deallocation
8441 * Connecting a TcpStream or binding a TcpListener is now based on a
8442 string address and a u16 port. This allows connecting to a hostname as
8444 * The Reader trait now contains a core method, read_at_least(), which
8445 correctly handles many repeated 0-length reads.
8446 * The process-spawning API is now centered around a builder-style
8448 * The :? printing qualifier has been moved from the standard library to
8449 an external libdebug crate.
8450 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8451 have been renamed to Eq/Ord.
8452 * The select/plural methods have been removed from format!. The escapes
8453 for { and } have also changed from \{ and \} to {{ and }},
8455 * The TaskBuilder API has been re-worked to be a true builder, and
8456 extension traits for spawning native/green tasks have been added.
8459 * All breaking changes to the language or libraries now have their
8460 commit message annotated with `[breaking-change]` to allow for easy
8461 discovery of breaking changes.
8462 * The compiler will now try to suggest how to annotate lifetimes if a
8463 lifetime-related error occurs.
8464 * Debug info continues to be improved greatly with general bug fixes and
8465 better support for situations like link time optimization (LTO).
8466 * Usage of syntax extensions when cross-compiling has been fixed.
8467 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8468 -fdata-sections and --gc-sections has been enabled by default
8469 * The compiler is now stricter about where it will load module files
8470 from when a module is declared via `mod foo;`.
8471 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8472 Syntax extensions are now discovered via a "plugin registrar" type
8473 which will be extended in the future to other various plugins.
8474 * Lints have been restructured to allow for dynamically loadable lints.
8475 * A number of rustdoc improvements:
8476 * The HTML output has been visually redesigned.
8477 * Markdown is now powered by hoedown instead of sundown.
8478 * Searching heuristics have been greatly improved.
8479 * The search index has been reduced in size by a great amount.
8480 * Cross-crate documentation via `pub use` has been greatly improved.
8481 * Primitive types are now hyperlinked and documented.
8482 * Documentation has been moved from static.rust-lang.org/doc to
8484 * A new sandbox, play.rust-lang.org, is available for running and
8485 sharing rust code examples on-line.
8486 * Unused attributes are now more robustly warned about.
8487 * The dead_code lint now warns about unused struct fields.
8488 * Cross-compiling to iOS is now supported.
8489 * Cross-compiling to mipsel is now supported.
8490 * Stability attributes are now inherited by default and no longer apply
8491 to intra-crate usage, only inter-crate usage.
8492 * Error message related to non-exhaustive match expressions have been
8496 Version 0.10 (2014-04-03)
8497 =========================
8499 * ~1500 changes, numerous bugfixes
8502 * A new RFC process is now in place for modifying the language.
8503 * Patterns with `@`-pointers have been removed from the language.
8504 * Patterns with unique vectors (`~[T]`) have been removed from the
8506 * Patterns with unique strings (`~str`) have been removed from the
8508 * `@str` has been removed from the language.
8509 * `@[T]` has been removed from the language.
8510 * `@self` has been removed from the language.
8511 * `@Trait` has been removed from the language.
8512 * Headers on `~` allocations which contain `@` boxes inside the type for
8513 reference counting have been removed.
8514 * The semantics around the lifetimes of temporary expressions have changed,
8515 see #3511 and #11585 for more information.
8516 * Cross-crate syntax extensions are now possible, but feature gated. See
8517 #11151 for more information. This includes both `macro_rules!` macros as
8518 well as syntax extensions such as `format!`.
8519 * New lint modes have been added, and older ones have been turned on to be
8521 * Unnecessary parentheses
8524 * Uppercase variables
8525 * Publicly visible private types
8526 * `#[deriving]` with raw pointers
8527 * Unsafe functions can no longer be coerced to closures.
8528 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8529 * The `#[simd]` attribute is now behind a feature gate.
8530 * Visibility is no longer allowed on `extern crate` statements, and
8531 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8532 * Trailing commas are now allowed in argument lists and tuple patterns.
8533 * The `do` keyword has been removed, it is now a reserved keyword.
8534 * Default type parameters have been implemented, but are feature gated.
8535 * Borrowed variables through captures in closures are now considered soundly.
8536 * `extern mod` is now `extern crate`
8537 * The `Freeze` trait has been removed.
8538 * The `Share` trait has been added for types that can be shared among
8540 * Labels in macros are now hygienic.
8541 * Expression/statement macro invocations can be delimited with `{}` now.
8542 * Treatment of types allowed in `static mut` locations has been tweaked.
8543 * The `*` and `.` operators are now overloadable through the `Deref` and
8545 * `~Trait` and `proc` no longer have `Send` bounds by default.
8546 * Partial type hints are now supported with the `_` type marker.
8547 * An `Unsafe` type was introduced for interior mutability. It is now
8548 considered undefined to transmute from `&T` to `&mut T` without using the
8550 * The #[linkage] attribute was implemented for extern statics/functions.
8551 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8552 * `Pod` was renamed to `Copy`.
8555 * The `libextra` library has been removed. It has now been decomposed into
8556 component libraries with smaller and more focused nuggets of
8557 functionality. The full list of libraries can be found on the
8558 documentation index page.
8559 * std: `std::condition` has been removed. All I/O errors are now propagated
8560 through the `Result` type. In order to assist with error handling, a
8561 `try!` macro for unwrapping errors with an early return and a lint for
8562 unused results has been added. See #12039 for more information.
8563 * std: The `vec` module has been renamed to `slice`.
8564 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8565 This will become the only growable vector in the future.
8566 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8567 are now found at `std::io::BufferedReader` instead of
8568 `std::io::buffered::BufferedReader`.
8569 * std: `print` and `println` are no longer in the prelude, the `print!` and
8570 `println!` macros are intended to be used instead.
8571 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8572 attempts to statically prevent cycles.
8573 * std: The standard distribution is adopting the policy of pushing failure
8574 to the user rather than failing in libraries. Many functions (such as
8575 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8576 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8577 deriving mode: `#[deriving(Show)]`.
8578 * std: `ToStr` is now implemented for all types implementing `Show`.
8579 * std: The formatting trait methods now take `&self` instead of `&T`
8580 * std: The `invert()` method on iterators has been renamed to `rev()`
8581 * std: `std::num` has seen a reduction in the genericity of its traits,
8582 consolidating functionality into a few core traits.
8583 * std: Backtraces are now printed on task failure if the environment
8584 variable `RUST_BACKTRACE` is present.
8585 * std: Naming conventions for iterators have been standardized. More details
8586 can be found on the wiki's style guide.
8587 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8588 still implement the function.
8589 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8590 * std: `assert_approx_eq!` has been removed
8591 * std: The `e` and `E` formatting specifiers for floats have been added to
8592 print them in exponential notation.
8593 * std: The `Times` trait has been removed
8594 * std: Indications of variance and opting out of builtin bounds is done
8595 through marker types in `std::kinds::marker` now
8596 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8597 `#[deriving(Hash)]` is now possible.
8598 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8599 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8600 * std: `Chan::new` is now `channel()`.
8601 * std: A new synchronous channel type has been implemented.
8602 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8603 * std: `hashmap` and `trie` have been moved to `libcollections`
8604 * std: `run` has been rolled into `io::process`
8605 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8606 * std: The equality and comparison traits have seen some reorganization.
8607 * std: `rand` has moved to `librand`.
8608 * std: `to_{lower,upper}case` has been implemented for `char`.
8609 * std: Logging has been moved to `liblog`.
8610 * collections: `HashMap` has been rewritten for higher performance and less
8612 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8613 it can be booted manually. The runtime guide has more information and
8615 * native: All I/O functionality except signals has been implemented.
8616 * green: Task spawning with `libgreen` has been optimized with stack caching
8617 and various trimming of code.
8618 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8619 * sync: The `extra::sync` module has been updated to modern rust (and moved
8620 to the `sync` library), tweaking and improving various interfaces while
8621 dropping redundant functionality.
8622 * sync: A new `Barrier` type has been added to the `sync` library.
8623 * sync: An efficient mutex for native and green tasks has been implemented.
8624 * serialize: The `base64` module has seen some improvement. It treats
8625 newlines better, has non-string error values, and has seen general
8627 * fourcc: A `fourcc!` macro was introduced
8628 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8629 hexadecimal literal.
8632 * `rustpkg` has been deprecated and removed from the main repository. Its
8633 replacement, `cargo`, is under development.
8634 * Nightly builds of rust are now available
8635 * The memory usage of rustc has been improved many times throughout this
8637 * The build process supports disabling rpath support for the rustc binary
8639 * Code generation has improved in some cases, giving more information to the
8640 LLVM optimization passes to enable more extensive optimizations.
8641 * Debuginfo compatibility with lldb on OSX has been restored.
8642 * The master branch is now gated on an android bot, making building for
8643 android much more reliable.
8644 * Output flags have been centralized into one `--emit` flag.
8645 * Crate type flags have been centralized into one `--crate-type` flag.
8646 * Codegen flags have been consolidated behind a `-C` flag.
8647 * Linking against outdated crates now has improved error messages.
8648 * Error messages with lifetimes will often suggest how to annotate the
8649 function to fix the error.
8650 * Many more types are documented in the standard library, and new guides
8652 * Many `rustdoc` improvements:
8653 * code blocks are syntax highlighted.
8654 * render standalone markdown files.
8655 * the --test flag tests all code blocks by default.
8656 * exported macros are displayed.
8657 * re-exported types have their documentation inlined at the location of the
8659 * search works across crates that have been rendered to the same output
8663 Version 0.9 (2014-01-09)
8664 ==========================
8666 * ~1800 changes, numerous bugfixes
8669 * The `float` type has been removed. Use `f32` or `f64` instead.
8670 * A new facility for enabling experimental features (feature gating) has
8671 been added, using the crate-level `#[feature(foo)]` attribute.
8672 * Managed boxes (@) are now behind a feature gate
8673 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8674 standard library's `Gc` or `Rc` types instead.
8675 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8676 * Jumping back to the top of a loop is now done with `continue` instead of
8678 * Strings can no longer be mutated through index assignment.
8679 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8680 hash delimiters, as in `r###"foo"###`.
8681 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8683 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8684 * `@fn`s have been removed.
8685 * `do` only works with procs in order to make it obvious what the cost
8687 * Single-element tuple-like structs can no longer be dereferenced to
8688 obtain the inner value. A more comprehensive solution for overloading
8689 the dereference operator will be provided in the future.
8690 * The `#[link(...)]` attribute has been replaced with
8691 `#[crate_id = "name#vers"]`.
8692 * Empty `impl`s must be terminated with empty braces and may not be
8693 terminated with a semicolon.
8694 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8695 no longer has any special meaning.
8696 * The old `fmt!` string formatting macro has been removed.
8697 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8698 `print!` and `println!`.
8699 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8700 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8701 `extern mod foo = "bar"` instead.
8702 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8703 * Macros can have attributes.
8704 * Macros can expand to items with attributes.
8705 * Macros can expand to multiple items.
8706 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8707 * Comments may be nested.
8708 * Values automatically coerce to trait objects they implement, without
8710 * Enum discriminants are no longer an entire word but as small as needed to
8711 contain all the variants. The `repr` attribute can be used to override
8712 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8713 `#[repr(C)]` to match C enums.
8714 * Non-string literals are not allowed in attributes (they never worked).
8715 * The FFI now supports variadic functions.
8716 * Octal numeric literals, as in `0o7777`.
8717 * The `concat!` syntax extension performs compile-time string concatenation.
8718 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8719 removed as Rust no longer uses segmented stacks.
8720 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8721 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8722 not `*`; ignoring remaining fields of a struct is also done with `..`,
8723 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8724 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8725 * `rustc` supports the "system" calling convention, which defaults to the
8726 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8728 * The `type_overflow` lint (default: warn) checks literals for overflow.
8729 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8730 * The `attribute_usage` lint (default: warn) warns about unknown
8732 * The `unknown_features` lint (default: warn) warns about unknown
8734 * The `dead_code` lint (default: warn) checks for dead code.
8735 * Rust libraries can be linked statically to one another
8736 * `#[link_args]` is behind the `link_args` feature gate.
8737 * Native libraries are now linked with `#[link(name = "foo")]`
8738 * Native libraries can be statically linked to a rust crate
8739 (`#[link(name = "foo", kind = "static")]`).
8740 * Native OS X frameworks are now officially supported
8741 (`#[link(name = "foo", kind = "framework")]`).
8742 * The `#[thread_local]` attribute creates thread-local (not task-local)
8743 variables. Currently behind the `thread_local` feature gate.
8744 * The `return` keyword may be used in closures.
8745 * Types that can be copied via a memcpy implement the `Pod` kind.
8746 * The `cfg` attribute can now be used on struct fields and enum variants.
8749 * std: The `option` and `result` API's have been overhauled to make them
8750 simpler, more consistent, and more composable.
8751 * std: The entire `std::io` module has been replaced with one that is
8752 more comprehensive and that properly interfaces with the underlying
8753 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8755 * std: `io::util` contains a number of useful implementations of
8756 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8757 `ZeroReader`, `TeeReader`.
8758 * std: The reference counted pointer type `extra::rc` moved into std.
8759 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8760 just a wrapper around it).
8761 * std: The `Either` type has been removed.
8762 * std: `fmt::Default` can be implemented for any type to provide default
8763 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8764 * std: The `rand` API continues to be tweaked.
8765 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8766 on failure in gdb, is now named `rust_fail`.
8767 * std: The `each_key` and `each_value` methods on `HashMap` have been
8768 replaced by the `keys` and `values` iterators.
8769 * std: Functions dealing with type size and alignment have moved from the
8770 `sys` module to the `mem` module.
8771 * std: The `path` module was written and API changed.
8772 * std: `str::from_utf8` has been changed to cast instead of allocate.
8773 * std: `starts_with` and `ends_with` methods added to vectors via the
8774 `ImmutableEqVector` trait, which is in the prelude.
8775 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8776 if the index is out of bounds.
8777 * std: Task failure no longer propagates between tasks, as the model was
8778 complex, expensive, and incompatible with thread-based tasks.
8779 * std: The `Any` type can be used for dynamic typing.
8780 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8782 * std: Methods that produce iterators generally do not have an `_iter`
8784 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8785 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8786 * std: `util::ignore` renamed to `prelude::drop`.
8787 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8789 * std: `vec::raw` has seen a lot of cleanup and API changes.
8790 * std: The standard library no longer includes any C++ code, and very
8791 minimal C, eliminating the dependency on libstdc++.
8792 * std: Runtime scheduling and I/O functionality has been factored out into
8793 extensible interfaces and is now implemented by two different crates:
8794 libnative, for native threading and I/O; and libgreen, for green threading
8795 and I/O. This paves the way for using the standard library in more limited
8796 embedded environments.
8797 * std: The `comm` module has been rewritten to be much faster, have a
8798 simpler, more consistent API, and to work for both native and green
8800 * std: All libuv dependencies have been moved into the rustuv crate.
8801 * native: New implementations of runtime scheduling on top of OS threads.
8802 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8804 * green: The green thread scheduler and message passing types are almost
8806 * extra: The `flatpipes` module had bitrotted and was removed.
8807 * extra: All crypto functions have been removed and Rust now has a policy of
8808 not reimplementing crypto in the standard library. In the future crypto
8809 will be provided by external crates with bindings to established libraries.
8810 * extra: `c_vec` has been modernized.
8811 * extra: The `sort` module has been removed. Use the `sort` method on
8815 * The `rust` and `rusti` commands have been removed, due to lack of
8817 * `rustdoc` was completely rewritten.
8818 * `rustdoc` can test code examples in documentation.
8819 * `rustpkg` can test packages with the argument, 'test'.
8820 * `rustpkg` supports arbitrary dependencies, including C libraries.
8821 * `rustc`'s support for generating debug info is improved again.
8822 * `rustc` has better error reporting for unbalanced delimiters.
8823 * `rustc`'s JIT support was removed due to bitrot.
8824 * Executables and static libraries can be built with LTO (-Z lto)
8825 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8829 Version 0.8 (2013-09-26)
8830 ============================
8832 * ~2200 changes, numerous bugfixes
8835 * The `for` loop syntax has changed to work with the `Iterator` trait.
8836 * At long last, unwinding works on Windows.
8837 * Default methods are ready for use.
8838 * Many trait inheritance bugs fixed.
8839 * Owned and borrowed trait objects work more reliably.
8840 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8841 * rustc can omit emission of code for the `debug!` macro if it is passed
8843 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8844 for foo.rs, then foo/mod.rs, and will generate an error when both are
8846 * Strings no longer contain trailing nulls. The new `std::c_str` module
8847 provides new mechanisms for converting to C strings.
8848 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8849 * The FFI has been overhauled such that foreign functions are called directly,
8850 instead of through a stack-switching wrapper.
8851 * Calling a foreign function must be done through a Rust function with the
8852 `#[fixed_stack_segment]` attribute.
8853 * The `externfn!` macro can be used to declare both a foreign function and
8854 a `#[fixed_stack_segment]` wrapper at once.
8855 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8856 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8857 * `priv` is disallowed everywhere except for struct fields and enum variants.
8858 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8859 * `ref` bindings in irrefutable patterns work correctly now.
8860 * `char` is now prevented from containing invalid code points.
8861 * Casting to `bool` is no longer allowed.
8862 * `\0` is now accepted as an escape in chars and strings.
8863 * `yield` is a reserved keyword.
8864 * `typeof` is a reserved keyword.
8865 * Crates may be imported by URL with `extern mod foo = "url";`.
8866 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8867 * Static vectors can be initialized with repeating elements,
8868 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8869 * Static structs can be initialized with functional record update,
8870 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8871 * `cfg!` can be used to conditionally execute code based on the crate
8872 configuration, similarly to `#[cfg(...)]`.
8873 * The `unnecessary_qualification` lint detects unneeded module
8874 prefixes (default: allow).
8875 * Arithmetic operations have been implemented on the SIMD types in
8876 `std::unstable::simd`.
8877 * Exchange allocation headers were removed, reducing memory usage.
8878 * `format!` implements a completely new, extensible, and higher-performance
8879 string formatting system. It will replace `fmt!`.
8880 * `print!` and `println!` write formatted strings (using the `format!`
8881 extension) to stdout.
8882 * `write!` and `writeln!` write formatted strings (using the `format!`
8883 extension) to the new Writers in `std::rt::io`.
8884 * The library section in which a function or static is placed may
8885 be specified with `#[link_section = "..."]`.
8886 * The `proto!` syntax extension for defining bounded message protocols
8888 * `macro_rules!` is hygienic for `let` declarations.
8889 * The `#[export_name]` attribute specifies the name of a symbol.
8890 * `unreachable!` can be used to indicate unreachable code, and fails
8894 * std: Transitioned to the new runtime, written in Rust.
8895 * std: Added an experimental I/O library, `rt::io`, based on the new
8897 * std: A new generic `range` function was added to the prelude, replacing
8898 `uint::range` and friends.
8899 * std: `range_rev` no longer exists. Since range is an iterator it can be
8900 reversed with `range(lo, hi).invert()`.
8901 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8902 renamed to `unwrap_or`.
8903 * std: The `iterator` module was renamed to `iter`.
8904 * std: Integral types now support the `checked_add`, `checked_sub`, and
8905 `checked_mul` operations for detecting overflow.
8906 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8908 * std: Methods are standardizing on conventions for casting methods:
8909 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8911 * std: The `CString` type in `c_str` provides new ways to convert to and
8913 * std: `DoubleEndedIterator` can yield elements in two directions.
8914 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8916 * std: `str::from_bytes` renamed to `str::from_utf8`.
8917 * std: `pop_opt` and `shift_opt` methods added to vectors.
8918 * std: The task-local data interface no longer uses @, and keys are
8919 no longer function pointers.
8920 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8921 * std: Added `SharedPort` to `comm`.
8922 * std: `Eq` has a default method for `ne`; only `eq` is required
8924 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8925 is required in implementations.
8926 * std: `is_utf8` performance is improved, impacting many string functions.
8927 * std: `os::MemoryMap` provides cross-platform mmap.
8928 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8929 are not 'in-bounds' are considered undefined.
8930 * std: Many freestanding functions in `vec` removed in favor of methods.
8931 * std: Many freestanding functions on scalar types removed in favor of
8933 * std: Many options to task builders were removed since they don't make
8934 sense in the new scheduler design.
8935 * std: More containers implement `FromIterator` so can be created by the
8937 * std: More complete atomic types in `unstable::atomics`.
8938 * std: `comm::PortSet` removed.
8939 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8940 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8941 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8942 default implementations.
8943 * std: Various `from_str` functions were removed in favor of a generic
8944 `from_str` which is available in the prelude.
8945 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8946 * extra: `dlist`, the doubly-linked list was modernized.
8947 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8948 * extra: Added `glob` module, replacing `std::os::glob`.
8949 * extra: `rope` was removed.
8950 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8951 * extra: `net`, and `timer` were removed. The experimental replacements
8952 are `std::rt::io::net` and `std::rt::io::timer`.
8953 * extra: Iterators implemented for `SmallIntMap`.
8954 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8955 * extra: `SmallIntSet` removed. Use `BitvSet`.
8956 * extra: Performance of JSON parsing greatly improved.
8957 * extra: `semver` updated to SemVer 2.0.0.
8958 * extra: `term` handles more terminals correctly.
8959 * extra: `dbg` module removed.
8960 * extra: `par` module removed.
8961 * extra: `future` was cleaned up, with some method renames.
8962 * extra: Most free functions in `getopts` were converted to methods.
8965 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8966 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8967 similarly to gcc's `--march` flag.
8968 * rustc's performance compiling small crates is much better.
8969 * rustpkg has received many improvements.
8970 * rustpkg supports git tags as package IDs.
8971 * rustpkg builds into target-specific directories so it can be used for
8973 * The number of concurrent test tasks is controlled by the environment
8974 variable RUST_TEST_TASKS.
8975 * The test harness can now report metrics for benchmarks.
8976 * All tools have man pages.
8977 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8978 * The runtime uses jemalloc for allocations.
8979 * Segmented stacks are temporarily disabled as part of the transition to
8980 the new runtime. Stack overflows are possible!
8981 * A new documentation backend, rustdoc_ng, is available for use. It is
8982 still invoked through the normal `rustdoc` command.
8985 Version 0.7 (2013-07-03)
8986 =======================
8988 * ~2000 changes, numerous bugfixes
8991 * `impl`s no longer accept a visibility qualifier. Put them on methods
8993 * The borrow checker has been rewritten with flow-sensitivity, fixing
8994 many bugs and inconveniences.
8995 * The `self` parameter no longer implicitly means `&'self self`,
8996 and can be explicitly marked with a lifetime.
8997 * Overloadable compound operators (`+=`, etc.) have been temporarily
8998 removed due to bugs.
8999 * The `for` loop protocol now requires `for`-iterators to return `bool`
9000 so they compose better.
9001 * The `Durable` trait is replaced with the `'static` bounds.
9002 * Trait default methods work more often.
9003 * Structs with the `#[packed]` attribute have byte alignment and
9004 no padding between fields.
9005 * Type parameters bound by `Copy` must now be copied explicitly with
9007 * It is now illegal to move out of a dereferenced unsafe pointer.
9008 * `Option<~T>` is now represented as a nullable pointer.
9009 * `@mut` does dynamic borrow checks correctly.
9010 * The `main` function is only detected at the topmost level of the crate.
9011 The `#[main]` attribute is still valid anywhere.
9012 * Struct fields may no longer be mutable. Use inherited mutability.
9013 * The `#[no_send]` attribute makes a type that would otherwise be
9015 * The `#[no_freeze]` attribute makes a type that would otherwise be
9017 * Unbounded recursion will abort the process after reaching the limit
9018 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9019 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9020 are never implicitly copyable.
9021 * `#[static_assert]` makes compile-time assertions about static bools.
9022 * At long last, 'argument modes' no longer exist.
9023 * The rarely used `use mod` statement no longer exists.
9026 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9028 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9029 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9031 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9032 and unsuffixed integer literals.
9035 * The `core` crate was renamed to `std`.
9036 * The `std` crate was renamed to `extra`.
9037 * More and improved documentation.
9038 * std: `iterator` module for external iterator objects.
9039 * Many old-style (internal, higher-order function) iterators replaced by
9040 implementations of `Iterator`.
9041 * std: Many old internal vector and string iterators,
9042 incl. `any`, `all`. removed.
9043 * std: The `finalize` method of `Drop` renamed to `drop`.
9044 * std: The `drop` method now takes `&mut self` instead of `&self`.
9045 * std: The prelude no longer re-exports any modules, only types and traits.
9046 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9047 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9048 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9049 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9050 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9051 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9052 * std: Many types implement `Clone`.
9053 * std: `path` type renamed to `Path`.
9054 * std: `mut` module and `Mut` type removed.
9055 * std: Many standalone functions removed in favor of methods and iterators
9056 in `vec`, `str`. In the future methods will also work as functions.
9057 * std: `reinterpret_cast` removed. Use `transmute`.
9058 * std: ascii string handling in `std::ascii`.
9059 * std: `Rand` is implemented for ~/@.
9060 * std: `run` module for spawning processes overhauled.
9061 * std: Various atomic types added to `unstable::atomic`.
9062 * std: Various types implement `Zero`.
9063 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9064 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9065 * std: Added `os::mkdir_recursive`.
9066 * std: Added `os::glob` function performs filesystems globs.
9067 * std: `FuzzyEq` renamed to `ApproxEq`.
9068 * std: `Map` now defines `pop` and `swap` methods.
9069 * std: `Cell` constructors converted to static methods.
9070 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9071 * extra: `flate` module moved from `std` to `extra`.
9072 * extra: `fileinput` module for iterating over a series of files.
9073 * extra: `Complex` number type and `complex` module.
9074 * extra: `Rational` number type and `rational` module.
9075 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9076 * extra: `term` uses terminfo now, is more correct.
9077 * extra: `arc` functions converted to methods.
9078 * extra: Implementation of fixed output size variations of SHA-2.
9081 * `unused_variables` lint mode for unused variables (default: warn).
9082 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9084 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9086 * `dead_assignment` lint mode for unread variables (default: warn).
9087 * `unnecessary_allocation` lint mode detects some heap allocations that are
9088 immediately borrowed so could be written without allocating (default: warn).
9089 * `missing_doc` lint mode (default: allow).
9090 * `unreachable_code` lint mode (default: warn).
9091 * The `rusti` command has been rewritten and a number of bugs addressed.
9092 * rustc outputs in color on more terminals.
9093 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9094 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9095 * Compiling with `-g` will make the binary record information about
9096 dynamic borrowcheck failures for debugging.
9097 * rustdoc has a nicer stylesheet.
9098 * Various improvements to rustdoc.
9099 * Improvements to rustpkg (see the detailed release notes).
9102 Version 0.6 (2013-04-03)
9103 ========================
9105 * ~2100 changes, numerous bugfixes
9108 * The self type parameter in traits is now spelled `Self`
9109 * The `self` parameter in trait and impl methods must now be explicitly
9110 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9111 * Static methods no longer require the `static` keyword and instead
9112 are distinguished by the lack of a `self` parameter
9113 * Replaced the `Durable` trait with the `'static` lifetime
9114 * The old closure type syntax with the trailing sigil has been
9115 removed in favor of the more consistent leading sigil
9116 * `super` is a keyword, and may be prefixed to paths
9117 * Trait bounds are separated with `+` instead of whitespace
9118 * Traits are implemented with `impl Trait for Type`
9119 instead of `impl Type: Trait`
9120 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9121 * The `export` keyword has finally been removed
9122 * The `move` keyword has been removed (see "Semantic changes")
9123 * The interior mutability qualifier on vectors, `[mut T]`, has been
9124 removed. Use `&mut [T]`, etc.
9125 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9126 * `fail` is no longer a keyword. Use `fail!()`
9127 * `assert` is no longer a keyword. Use `assert!()`
9128 * `log` is no longer a keyword. use `debug!`, etc.
9129 * 1-tuples may be represented as `(T,)`
9130 * Struct fields may no longer be `mut`. Use inherited mutability,
9131 `@mut T`, `core::mut` or `core::cell`
9132 * `extern mod { ... }` is no longer valid syntax for foreign
9133 function modules. Use extern blocks: `extern { ... }`
9134 * Newtype enums removed. Use tuple-structs.
9135 * Trait implementations no longer support visibility modifiers
9136 * Pattern matching over vectors improved and expanded
9137 * `const` renamed to `static` to correspond to lifetime name,
9138 and make room for future `static mut` unsafe mutable globals.
9139 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9140 * `Clone` implementations can be automatically generated with
9141 `#[deriving(Clone)]`
9142 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9143 instead of `foo as Bar`.
9144 * Fixed length vector types are now written as `[int, .. 3]`
9145 instead of `[int * 3]`.
9146 * Fixed length vector types can express the length as a constant
9147 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9150 * Types with owned pointers or custom destructors move by default,
9151 eliminating the `move` keyword
9152 * All foreign functions are considered unsafe
9153 * &mut is now unaliasable
9154 * Writes to borrowed @mut pointers are prevented dynamically
9156 * The name of the main function can be customized using #[main]
9157 * The default type of an inferred closure is &fn instead of @fn
9158 * `use` statements may no longer be "chained" - they cannot import
9159 identifiers imported by previous `use` statements
9160 * `use` statements are crate relative, importing from the "top"
9161 of the crate by default. Paths may be prefixed with `super::`
9162 or `self::` to change the search behavior.
9163 * Method visibility is inherited from the implementation declaration
9164 * Structural records have been removed
9165 * Many more types can be used in static items, including enums
9166 'static-lifetime pointers and vectors
9167 * Pattern matching over vectors improved and expanded
9168 * Typechecking of closure types has been overhauled to
9169 improve inference and eliminate unsoundness
9170 * Macros leave scope at the end of modules, unless that module is
9171 tagged with #[macro_escape]
9174 * Added big integers to `std::bigint`
9175 * Removed `core::oldcomm` module
9176 * Added pipe-based `core::comm` module
9177 * Numeric traits have been reorganized under `core::num`
9178 * `vec::slice` finally returns a slice
9179 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9180 * Containers reorganized around traits in `core::container`
9181 * `core::dvec` removed, `~[T]` is a drop-in replacement
9182 * `core::send_map` renamed to `core::hashmap`
9183 * `std::map` removed; replaced with `core::hashmap`
9184 * `std::treemap` reimplemented as an owned balanced tree
9185 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9186 * `core::trie` added as a fast ordered map for integer keys
9187 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9188 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9189 overload the comparison operators, whereas `TotalOrd` is used
9190 by certain container types
9193 * Replaced the 'cargo' package manager with 'rustpkg'
9194 * Added all-purpose 'rust' tool
9195 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9196 * rustc now *attempts* to offer spelling suggestions
9197 * Improved support for ARM and Android
9198 * Preliminary MIPS backend
9199 * Improved foreign function ABI implementation for x86, x86_64
9200 * Various memory usage improvements
9201 * Rust code may be embedded in foreign code under limited circumstances
9202 * Inline assembler supported by new asm!() syntax extension.
9205 Version 0.5 (2012-12-21)
9206 ===========================
9208 * ~900 changes, numerous bugfixes
9211 * Removed `<-` move operator
9212 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9213 * Removed old fixed length vector syntax - `[T]/N`
9214 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9215 * Macros may now expand to items and statements
9216 * `a.b()` is always parsed as a method call, never as a field projection
9217 * `Eq` and `IterBytes` implementations can be automatically generated
9218 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9219 * Removed the special crate language for `.rc` files
9220 * Function arguments may consist of any irrefutable pattern
9223 * `&` and `~` pointers may point to objects
9224 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9225 * Enum variants may be structs
9226 * Destructors can be added to all nominal types with the Drop trait
9227 * Structs and nullary enum variants may be constants
9228 * Values that cannot be implicitly copied are now automatically moved
9229 without writing `move` explicitly
9230 * `&T` may now be coerced to `*T`
9231 * Coercions happen in `let` statements as well as function calls
9232 * `use` statements now take crate-relative paths
9233 * The module and type namespaces have been merged so that static
9234 method names can be resolved under the trait in which they are
9237 * Improved support for language features
9238 * Trait inheritance works in many scenarios
9239 * More support for explicit self arguments in methods - `self`, `&self`
9240 `@self`, and `~self` all generally work as expected
9241 * Static methods work in more situations
9242 * Experimental: Traits may declare default methods for the implementations
9246 * New condition handling system in `core::condition`
9247 * Timsort added to `std::sort`
9248 * New priority queue, `std::priority_queue`
9249 * Pipes for serializable types, `std::flatpipes'
9250 * Serialization overhauled to be trait-based
9251 * Expanded `getopts` definitions
9252 * Moved futures to `std`
9253 * More functions are pure now
9254 * `core::comm` renamed to `oldcomm`. Still deprecated
9255 * `rustdoc` and `cargo` are libraries now
9258 * Added a preliminary REPL, `rusti`
9259 * License changed from MIT to dual MIT/APL2
9262 Version 0.4 (2012-10-15)
9263 ==========================
9265 * ~2000 changes, numerous bugfixes
9268 * All keywords are now strict and may not be used as identifiers anywhere
9269 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9270 'of', 'with', 'to', 'class'.
9271 * Classes are replaced with simpler structs
9272 * Explicit method self types
9273 * `ret` became `return` and `alt` became `match`
9274 * `import` is now `use`; `use is now `extern mod`
9275 * `extern mod { ... }` is now `extern { ... }`
9276 * `use mod` is the recommended way to import modules
9277 * `pub` and `priv` replace deprecated export lists
9278 * The syntax of `match` pattern arms now uses fat arrow (=>)
9279 * `main` no longer accepts an args vector; use `os::args` instead
9282 * Trait implementations are now coherent, ala Haskell typeclasses
9283 * Trait methods may be static
9284 * Argument modes are deprecated
9285 * Borrowed pointers are much more mature and recommended for use
9286 * Strings and vectors in the static region are stored in constant memory
9287 * Typestate was removed
9288 * Resolution rewritten to be more reliable
9289 * Support for 'dual-mode' data structures (freezing and thawing)
9292 * Most binary operators can now be overloaded via the traits in
9294 * `std::net::url` for representing URLs
9295 * Sendable hash maps in `core::send_map`
9296 * `core::task' gained a (currently unsafe) task-local storage API
9299 * An efficient new intertask communication primitive called the pipe,
9300 along with a number of higher-level channel types, in `core::pipes`
9301 * `std::arc`, an atomically reference counted, immutable, shared memory
9303 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9304 * Futures are now based on pipes and sendable
9305 * More robust linked task failure
9306 * Improved task builder API
9309 * Improved error reporting
9310 * Preliminary JIT support
9311 * Preliminary work on precise GC
9312 * Extensive architectural improvements to rustc
9313 * Begun a transition away from buggy C++-based reflection (shape) code to
9314 Rust-based (visitor) code
9315 * All hash functions and tables converted to secure, randomized SipHash
9318 Version 0.3 (2012-07-12)
9319 ========================
9321 * ~1900 changes, numerous bugfixes
9323 * New coding conveniences
9324 * Integer-literal suffix inference
9325 * Per-item control over warnings, errors
9326 * #[cfg(windows)] and #[cfg(unix)] attributes
9327 * Documentation comments
9328 * More compact closure syntax
9329 * 'do' expressions for treating higher-order functions as
9331 * *-patterns (wildcard extended to all constructor fields)
9334 * Name resolution pass and exhaustiveness checker rewritten
9335 * Region pointers and borrow checking supersede alias
9337 * Init-ness checking is now provided by a region-based liveness
9338 pass instead of the typestate pass; same for last-use analysis
9339 * Extensive work on region pointers
9341 * Experimental new language features
9342 * Slices and fixed-size, interior-allocated vectors
9343 * #!-comments for lang versioning, shell execution
9344 * Destructors and iface implementation for classes;
9345 type-parameterized classes and class methods
9346 * 'const' type kind for types that can be used to implement
9347 shared-memory concurrency patterns
9351 * Removal of various obsolete features
9352 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9353 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9355 * Constructs: do-while loops ('do' repurposed), fn binding,
9356 resources (replaced by destructors)
9358 * Compiler reorganization
9359 * Syntax-layer of compiler split into separate crate
9360 * Clang (from LLVM project) integrated into build
9361 * Typechecker split into sub-modules
9364 * New time functions
9365 * Extension methods for many built-in types
9366 * Arc: atomic-refcount read-only / exclusive-use shared cells
9367 * Par: parallel map and search routines
9368 * Extensive work on libuv interface
9369 * Much vector code moved to libraries
9370 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9371 #include, #include_str, #include_bin
9374 * Cargo automatically resolves dependencies
9377 Version 0.2 (2012-03-29)
9378 =========================
9380 * >1500 changes, numerous bugfixes
9382 * New docs and doc tooling
9384 * New port: FreeBSD x86_64
9386 * Compilation model enhancements
9387 * Generics now specialized, multiply instantiated
9388 * Functions now inlined across separate crates
9390 * Scheduling, stack and threading fixes
9391 * Noticeably improved message-passing performance
9392 * Explicit schedulers
9396 * Experimental new language features
9397 * Operator overloading
9401 * Various language extensions
9402 * C-callback function types: 'crust fn ...'
9403 * Infinite-loop construct: 'loop { ... }'
9404 * Shorten 'mutable' to 'mut'
9405 * Required mutable-local qualifier: 'let mut ...'
9406 * Basic glob-exporting: 'export foo::*;'
9407 * Alt now exhaustive, 'alt check' for runtime-checked
9408 * Block-function form of 'for' loop, with 'break' and 'ret'.
9411 * AST quasi-quote syntax extension
9412 * Revived libuv interface
9413 * New modules: core::{future, iter}, std::arena
9414 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9415 * Extensive cleanup, regularization in libstd, libcore
9418 Version 0.1 (2012-01-20)
9419 ===============================
9421 * Most language features work, including:
9422 * Unique pointers, unique closures, move semantics
9423 * Interface-constrained generics
9424 * Static interface dispatch
9426 * Multithread task scheduling
9427 * Typestate predicates
9428 * Failure unwinding, destructors
9429 * Pattern matching and destructuring assignment
9430 * Lightweight block-lambda syntax
9431 * Preliminary macro-by-example
9433 * Compiler works with the following configurations:
9434 * Linux: x86 and x86_64 hosts and targets
9435 * macOS: x86 and x86_64 hosts and targets
9436 * Windows: x86 hosts and targets
9438 * Cross compilation / multi-target configuration supported.
9440 * Preliminary API-documentation and package-management tools included.
9444 * Documentation is incomplete.
9446 * Performance is below intended target.
9448 * Standard library APIs are subject to extensive change, reorganization.
9450 * Language-level versioning is not yet operational - future code will