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]
442 \* Refer to Rust's [platform support page][forge-platform-support] for more
443 information on Rust's tiered platform support.
448 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
450 - [`proc_macro::TokenStream` now implements `Default`.][72234]
451 - [You can now use `char` with
452 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
453 a range of codepoints.][72413] E.g.
454 you can now write the following;
456 for ch in 'a'..='z' {
460 // Prints "abcdefghijklmnopqrstuvwxyz"
462 - [`OsString` now implements `FromStr`.][71662]
463 - [The `saturating_neg` method has been added to all signed integer primitive
464 types, and the `saturating_abs` method has been added for all integer
465 primitive types.][71886]
466 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
467 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
469 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
470 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
471 integer types.][69813]
472 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
473 integer types.][72324]
474 - [The `fetch_update` method has been added to all atomic integer types.][71843]
479 - [`BTreeMap::remove_entry`]
481 - [`rc::Weak::as_ptr`]
482 - [`rc::Weak::from_raw`]
483 - [`rc::Weak::into_raw`]
484 - [`str::strip_prefix`]
485 - [`str::strip_suffix`]
486 - [`sync::Weak::as_ptr`]
487 - [`sync::Weak::from_raw`]
488 - [`sync::Weak::into_raw`]
489 - [`char::UNICODE_VERSION`]
490 - [`Span::resolved_at`]
491 - [`Span::located_at`]
492 - [`Span::mixed_site`]
493 - [`unix::process::CommandExt::arg0`]
498 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
503 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
504 `~~outdated information~~` becomes "~~outdated information~~".
505 - [Added an emoji to Rustdoc's deprecated API message.][72014]
509 - [Trying to self initialize a static value (that is creating a value using
510 itself) is unsound and now causes a compile error.][71140]
511 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
512 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
513 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
514 previously undocumented and not intended for public use. Rustdoc still provides
515 a non-zero exit code on errors.
516 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
517 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
518 flags while cargo is adding `embed-bitcode` itself. The recommended way to
519 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
520 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
524 - [Make clippy a git subtree instead of a git submodule][70655]
525 - [Unify the undo log of all snapshot types][69464]
527 [71848]: https://github.com/rust-lang/rust/issues/71848/
528 [73420]: https://github.com/rust-lang/rust/issues/73420/
529 [72324]: https://github.com/rust-lang/rust/pull/72324/
530 [71843]: https://github.com/rust-lang/rust/pull/71843/
531 [71886]: https://github.com/rust-lang/rust/pull/71886/
532 [72234]: https://github.com/rust-lang/rust/pull/72234/
533 [72239]: https://github.com/rust-lang/rust/pull/72239/
534 [72397]: https://github.com/rust-lang/rust/pull/72397/
535 [72413]: https://github.com/rust-lang/rust/pull/72413/
536 [72014]: https://github.com/rust-lang/rust/pull/72014/
537 [72062]: https://github.com/rust-lang/rust/pull/72062/
538 [72094]: https://github.com/rust-lang/rust/pull/72094/
539 [72133]: https://github.com/rust-lang/rust/pull/72133/
540 [71900]: https://github.com/rust-lang/rust/pull/71900/
541 [71928]: https://github.com/rust-lang/rust/pull/71928/
542 [71662]: https://github.com/rust-lang/rust/pull/71662/
543 [71716]: https://github.com/rust-lang/rust/pull/71716/
544 [71447]: https://github.com/rust-lang/rust/pull/71447/
545 [71269]: https://github.com/rust-lang/rust/pull/71269/
546 [71095]: https://github.com/rust-lang/rust/pull/71095/
547 [71140]: https://github.com/rust-lang/rust/pull/71140/
548 [70655]: https://github.com/rust-lang/rust/pull/70655/
549 [70705]: https://github.com/rust-lang/rust/pull/70705/
550 [69984]: https://github.com/rust-lang/rust/pull/69984/
551 [69813]: https://github.com/rust-lang/rust/pull/69813/
552 [69464]: https://github.com/rust-lang/rust/pull/69464/
553 [68717]: https://github.com/rust-lang/rust/pull/68717/
554 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
555 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
556 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
557 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
558 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
559 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
560 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
561 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
562 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
563 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
564 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
565 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
566 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
567 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
568 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
569 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
570 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
573 Version 1.44.1 (2020-06-18)
574 ===========================
576 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
577 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
578 * [Fix crashes when finding backtrace on macOS.][71397]
579 * [Clippy applies lint levels into different files.][clippy/5356]
581 [71397]: https://github.com/rust-lang/rust/issues/71397
582 [73078]: https://github.com/rust-lang/rust/issues/73078
583 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
584 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
587 Version 1.44.0 (2020-06-04)
588 ==========================
592 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
593 - [Added the `unused_braces` lint.][70081]
595 **Syntax-only changes**
597 - [Expansion-driven outline module parsing][69838]
602 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
607 These are still rejected semantically, so you will likely receive an error but
608 these changes can be seen and parsed by macros and conditional compilation.
612 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
613 Additionally when in incremental mode rustc defaults to 256 codegen units.
614 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
615 a panic is thrown.][67502]
616 - [Added tier 3\* support for the `aarch64-unknown-none` and
617 `aarch64-unknown-none-softfloat` targets.][68334]
618 - [Added tier 3 support for `arm64-apple-tvos` and
619 `x86_64-apple-tvos` targets.][68191]
624 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
625 `vec![]` to be able to be used in `const` contexts.
626 - [`convert::Infallible` now implements `Hash`.][70281]
627 - [`OsString` now implements `DerefMut` and `IndexMut` returning
628 a `&mut OsStr`.][70048]
629 - [Unicode 13 is now supported.][69929]
630 - [`String` now implements `From<&mut str>`.][69661]
631 - [`IoSlice` now implements `Copy`.][69403]
632 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
633 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
634 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
635 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
636 integer types.][69373]
640 - [`PathBuf::with_capacity`]
641 - [`PathBuf::capacity`]
643 - [`PathBuf::reserve`]
644 - [`PathBuf::reserve_exact`]
645 - [`PathBuf::shrink_to_fit`]
646 - [`f32::to_int_unchecked`]
647 - [`f64::to_int_unchecked`]
648 - [`Layout::align_to`]
649 - [`Layout::pad_to_align`]
655 - [Added the `cargo tree` command which will print a tree graph of
656 your dependencies.][cargo/8062] E.g.
658 mdbook v0.3.2 (/Users/src/rust/mdbook)
660 │ ├── html5ever v0.24.0
662 │ │ │ └── cfg-if v0.1.9
664 │ │ └── markup5ever v0.9.0
665 │ │ ├── log v0.4.8 (*)
667 │ │ │ └── phf_shared v0.7.24
668 │ │ │ ├── siphasher v0.2.3
669 │ │ │ └── unicase v1.4.2
670 │ │ │ [build-dependencies]
671 │ │ │ └── version_check v0.1.5
674 You can also display dependencies on multiple versions of the same crate with
675 `cargo tree -d` (short for `cargo tree --duplicates`).
679 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
680 the version in the sidebar.][69494]
684 - [Rustc now correctly generates static libraries on Windows GNU targets with
685 the `.a` extension, rather than the previous `.lib`.][70937]
686 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
687 - [The `file_name` property in JSON output of macro errors now points the actual
688 source file rather than the previous format of `<NAME macros>`.][70969]
689 **Note:** this may not point to a file that actually exists on the user's system.
690 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
691 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
692 not allow zero initialization such as `NonZeroU8`.][66059] This was
693 previously a warning.
694 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
695 operator has been defined as a saturating operation.][71269] This was previously
696 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
697 continue using the current behaviour, which may be desirable in rare performance
698 sensitive situations.
702 These changes provide no direct user facing benefits, but represent significant
703 improvements to the internals and overall performance of rustc and
706 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
707 - [Replace big JS dict with JSON parsing.][71250]
709 [69373]: https://github.com/rust-lang/rust/pull/69373/
710 [66059]: https://github.com/rust-lang/rust/pull/66059/
711 [68191]: https://github.com/rust-lang/rust/pull/68191/
712 [68899]: https://github.com/rust-lang/rust/pull/68899/
713 [71147]: https://github.com/rust-lang/rust/pull/71147/
714 [71250]: https://github.com/rust-lang/rust/pull/71250/
715 [70937]: https://github.com/rust-lang/rust/pull/70937/
716 [70969]: https://github.com/rust-lang/rust/pull/70969/
717 [70632]: https://github.com/rust-lang/rust/pull/70632/
718 [70281]: https://github.com/rust-lang/rust/pull/70281/
719 [70345]: https://github.com/rust-lang/rust/pull/70345/
720 [70048]: https://github.com/rust-lang/rust/pull/70048/
721 [70081]: https://github.com/rust-lang/rust/pull/70081/
722 [70156]: https://github.com/rust-lang/rust/pull/70156/
723 [71269]: https://github.com/rust-lang/rust/pull/71269/
724 [69838]: https://github.com/rust-lang/rust/pull/69838/
725 [69929]: https://github.com/rust-lang/rust/pull/69929/
726 [69661]: https://github.com/rust-lang/rust/pull/69661/
727 [69778]: https://github.com/rust-lang/rust/pull/69778/
728 [69494]: https://github.com/rust-lang/rust/pull/69494/
729 [69403]: https://github.com/rust-lang/rust/pull/69403/
730 [69033]: https://github.com/rust-lang/rust/pull/69033/
731 [68692]: https://github.com/rust-lang/rust/pull/68692/
732 [68334]: https://github.com/rust-lang/rust/pull/68334/
733 [67502]: https://github.com/rust-lang/rust/pull/67502/
734 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
735 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
736 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
737 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
738 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
739 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
740 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
741 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
742 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
743 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
744 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
745 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
746 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
749 Version 1.43.1 (2020-05-07)
750 ===========================
752 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
753 * [Fixed the stabilization of AVX-512 features.][71473]
754 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
756 [71430]: https://github.com/rust-lang/rust/pull/71430
757 [71473]: https://github.com/rust-lang/rust/issues/71473
758 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
761 Version 1.43.0 (2020-04-23)
762 ==========================
766 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
767 the type inferred correctly.][68129]
768 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
770 **Syntax only changes**
771 - [Allow `type Foo: Ord` syntactically.][69361]
772 - [Fuse associated and extern items up to defaultness.][69194]
773 - [Syntactically allow `self` in all `fn` contexts.][68764]
774 - [Merge `fn` syntax + cleanup item parsing.][68728]
775 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
776 For example, you may now write:
778 macro_rules! mac_trait {
788 These are still rejected *semantically*, so you will likely receive an error but
789 these changes can be seen and parsed by macros and
790 conditional compilation.
795 - [You can now pass multiple lint flags to rustc to override the previous
796 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
797 everything in the `unused` lint group except `unused-variables` which
798 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
799 everything in the `unused` lint group **including** `unused-variables` since
800 the allow flag is specified before the deny flag (and therefore overridden).
801 - [rustc will now prefer your system MinGW libraries over its bundled libraries
802 if they are available on `windows-gnu`.][67429]
803 - [rustc now buffers errors/warnings printed in JSON.][69227]
807 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
808 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
809 respectively.][69538] **Note** These conversions are only available when `N`
811 - [You can now use associated constants on floats and integers directly, rather
812 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
813 `f32::NAN` with no imports.
814 - [`u8::is_ascii` is now `const`.][68984]
815 - [`String` now implements `AsMut<str>`.][68742]
816 - [Added the `primitive` module to `std` and `core`.][67637] This module
817 reexports Rust's primitive types. This is mainly useful in macros
818 where you want avoid these types being shadowed.
819 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
820 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
824 - [`Once::is_completed`]
829 - [`iter::once_with`]
833 - [You can now set config `[profile]`s in your `.cargo/config`, or through
834 your environment.][cargo/7823]
835 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
836 executable path when running integration tests or benchmarks.][cargo/7697]
837 `<name>` is the name of your binary as-is e.g. If you wanted the executable
838 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
842 - [Certain checks in the `const_err` lint were deemed unrelated to const
843 evaluation][69185], and have been moved to the `unconditional_panic` and
844 `arithmetic_overflow` lints.
849 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
850 has been a warning since 1.36.0.
851 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
852 led to some instances being accepted, and now correctly emits a hard error.
854 [69340]: https://github.com/rust-lang/rust/pull/69340
858 These changes provide no direct user facing benefits, but represent significant
859 improvements to the internals and overall performance of `rustc` and
862 - [All components are now built with `opt-level=3` instead of `2`.][67878]
863 - [Improved how rustc generates drop code.][67332]
864 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
865 - [traits: preallocate 2 Vecs of known initial size][69022]
866 - [Avoid exponential behaviour when relating types][68772]
867 - [Skip `Drop` terminators for enum variants without drop glue][68943]
868 - [Improve performance of coherence checks][68966]
869 - [Deduplicate types in the generator witness][68672]
870 - [Invert control in struct_lint_level.][68725]
872 [67332]: https://github.com/rust-lang/rust/pull/67332/
873 [67429]: https://github.com/rust-lang/rust/pull/67429/
874 [67637]: https://github.com/rust-lang/rust/pull/67637/
875 [67642]: https://github.com/rust-lang/rust/pull/67642/
876 [67878]: https://github.com/rust-lang/rust/pull/67878/
877 [67885]: https://github.com/rust-lang/rust/pull/67885/
878 [68129]: https://github.com/rust-lang/rust/pull/68129/
879 [68672]: https://github.com/rust-lang/rust/pull/68672/
880 [68725]: https://github.com/rust-lang/rust/pull/68725/
881 [68728]: https://github.com/rust-lang/rust/pull/68728/
882 [68738]: https://github.com/rust-lang/rust/pull/68738/
883 [68742]: https://github.com/rust-lang/rust/pull/68742/
884 [68764]: https://github.com/rust-lang/rust/pull/68764/
885 [68772]: https://github.com/rust-lang/rust/pull/68772/
886 [68943]: https://github.com/rust-lang/rust/pull/68943/
887 [68952]: https://github.com/rust-lang/rust/pull/68952/
888 [68966]: https://github.com/rust-lang/rust/pull/68966/
889 [68984]: https://github.com/rust-lang/rust/pull/68984/
890 [69022]: https://github.com/rust-lang/rust/pull/69022/
891 [69185]: https://github.com/rust-lang/rust/pull/69185/
892 [69194]: https://github.com/rust-lang/rust/pull/69194/
893 [69201]: https://github.com/rust-lang/rust/pull/69201/
894 [69227]: https://github.com/rust-lang/rust/pull/69227/
895 [69548]: https://github.com/rust-lang/rust/pull/69548/
896 [69256]: https://github.com/rust-lang/rust/pull/69256/
897 [69361]: https://github.com/rust-lang/rust/pull/69361/
898 [69366]: https://github.com/rust-lang/rust/pull/69366/
899 [69538]: https://github.com/rust-lang/rust/pull/69538/
900 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
901 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
902 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
903 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
904 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
905 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
906 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
907 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
910 Version 1.42.0 (2020-03-12)
911 ==========================
915 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
917 fn foo(words: &[&str]) {
919 ["Hello", "World", "!", ..] => println!("Hello World!"),
920 ["Foo", "Bar", ..] => println!("Baz"),
921 rest => println!("{:?}", rest),
925 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
926 that you can create an enum that has the exact layout and ABI of the type
928 - [There are some *syntax-only* changes:][67131]
929 - `default` is syntactically allowed before items in `trait` definitions.
930 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
931 leave out their bodies in favor of `;`.
932 - Bounds on associated types in `impl`s are now syntactically allowed
933 (e.g. `type Foo: Ord;`).
934 - `...` (the C-variadic type) may occur syntactically directly as the type of
935 any function parameter.
937 These are still rejected *semantically*, so you will likely receive an error
938 but these changes can be seen and parsed by procedural macros and
939 conditional compilation.
943 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
944 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
945 - [`Option::{expect,unwrap}` and
946 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
947 pointing to the location where they were called, rather than
948 `core`'s internals. ][67887]
950 \* Refer to Rust's [platform support page][forge-platform-support] for more
951 information on Rust's tiered platform support.
955 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
956 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
957 to implement `Sized`.][67935]
958 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
959 - [`Layout::new` is now `const`.][66254]
960 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
965 - [`CondVar::wait_while`]
966 - [`CondVar::wait_timeout_while`]
968 - [`DebugMap::value`]
969 - [`ManuallyDrop::take`]
971 - [`ptr::slice_from_raw_parts_mut`]
972 - [`ptr::slice_from_raw_parts`]
976 - [You no longer need to include `extern crate proc_macro;` to be able to
977 `use proc_macro;` in the `2018` edition.][cargo/7700]
981 - [`Error::description` has been deprecated, and its use will now produce a
982 warning.][66919] It's recommended to use `Display`/`to_string` instead.
984 [68253]: https://github.com/rust-lang/rust/pull/68253/
985 [68348]: https://github.com/rust-lang/rust/pull/68348/
986 [67935]: https://github.com/rust-lang/rust/pull/67935/
987 [68339]: https://github.com/rust-lang/rust/pull/68339/
988 [68122]: https://github.com/rust-lang/rust/pull/68122/
989 [67712]: https://github.com/rust-lang/rust/pull/67712/
990 [67887]: https://github.com/rust-lang/rust/pull/67887/
991 [67131]: https://github.com/rust-lang/rust/pull/67131/
992 [67233]: https://github.com/rust-lang/rust/pull/67233/
993 [66899]: https://github.com/rust-lang/rust/pull/66899/
994 [66919]: https://github.com/rust-lang/rust/pull/66919/
995 [66254]: https://github.com/rust-lang/rust/pull/66254/
996 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
997 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
998 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
999 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
1000 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
1001 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
1002 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
1003 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
1004 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
1007 Version 1.41.1 (2020-02-27)
1008 ===========================
1010 * [Always check types of static items][69145]
1011 * [Always check lifetime bounds of `Copy` impls][69145]
1012 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1014 [69225]: https://github.com/rust-lang/rust/issues/69225
1015 [69145]: https://github.com/rust-lang/rust/pull/69145
1018 Version 1.41.0 (2020-01-30)
1019 ===========================
1024 - [You can now pass type parameters to foreign items when implementing
1025 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1026 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1027 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1028 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1029 - [You can now use any valid identifier in a `format_args` macro.][66847]
1030 Previously identifiers starting with an underscore were not allowed.
1031 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1032 enum variants.][66183] These are still rejected semantically, but
1033 can be seen and parsed by procedural macros and conditional compilation.
1038 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1039 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1040 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1041 - [You can now pass an arguments file passing the `@path` syntax
1042 to rustc.][66172] Note that the format differs somewhat from what is
1043 found in other tooling; please see [the documentation][argfile-docs] for
1045 - [You can now provide `--extern` flag without a path, indicating that it is
1046 available from the search path or specified with an `-L` flag.][64882]
1048 \* Refer to Rust's [platform support page][forge-platform-support] for more
1049 information on Rust's tiered platform support.
1051 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1056 - [The `core::panic` module is now stable.][66771] It was already stable
1058 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1059 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1060 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1065 - [`Result::map_or`]
1066 - [`Result::map_or_else`]
1067 - [`std::rc::Weak::weak_count`]
1068 - [`std::rc::Weak::strong_count`]
1069 - [`std::sync::Weak::weak_count`]
1070 - [`std::sync::Weak::strong_count`]
1075 - [Cargo will now document all the private items for binary crates
1076 by default.][cargo/7593]
1077 - [`cargo-install` will now reinstall the package if it detects that it is out
1078 of date.][cargo/7560]
1079 - [Cargo.lock now uses a more git friendly format that should help to reduce
1080 merge conflicts.][cargo/7579]
1081 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1082 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1083 optimisation level to `2` for debug builds. You can also use
1084 `[profile.<profile>.build-override]` to override build scripts and
1090 - [You can now specify `edition` in documentation code blocks to compile the block
1091 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1092 should be compiled the 2018 edition of Rust.
1093 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1094 current theme with `--check-theme`.][54733]
1095 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1100 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1101 Apple targets.][apple-32bit-drop] This means that the source code is still
1102 available to build, but the targets are no longer being tested and release
1103 binaries for those platforms will no longer be distributed by the Rust project.
1104 Please refer to the linked blog post for more information.
1106 [54733]: https://github.com/rust-lang/rust/pull/54733/
1107 [61351]: https://github.com/rust-lang/rust/pull/61351/
1108 [67255]: https://github.com/rust-lang/rust/pull/67255/
1109 [66661]: https://github.com/rust-lang/rust/pull/66661/
1110 [66771]: https://github.com/rust-lang/rust/pull/66771/
1111 [66847]: https://github.com/rust-lang/rust/pull/66847/
1112 [66238]: https://github.com/rust-lang/rust/pull/66238/
1113 [66277]: https://github.com/rust-lang/rust/pull/66277/
1114 [66325]: https://github.com/rust-lang/rust/pull/66325/
1115 [66172]: https://github.com/rust-lang/rust/pull/66172/
1116 [66183]: https://github.com/rust-lang/rust/pull/66183/
1117 [65879]: https://github.com/rust-lang/rust/pull/65879/
1118 [65013]: https://github.com/rust-lang/rust/pull/65013/
1119 [64882]: https://github.com/rust-lang/rust/pull/64882/
1120 [64325]: https://github.com/rust-lang/rust/pull/64325/
1121 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1122 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1123 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1124 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1125 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1126 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1127 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1128 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1129 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1130 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1131 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1133 Version 1.40.0 (2019-12-19)
1134 ===========================
1138 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1139 `const` contexts.][65188] e.g.
1142 pub struct Point(i32, i32);
1144 const ORIGIN: Point = {
1145 let constructor = Point;
1151 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1152 indicate that there may be variants or fields added in the future.][64639]
1153 For example this requires adding a wild-card branch (`_ => {}`) to any match
1154 statements on a non-exhaustive `enum`. [(RFC 2008)]
1155 - [You can now use function-like procedural macros in `extern` blocks and in
1156 type positions.][63931] e.g. `type Generated = macro!();`
1157 - [Function-like and attribute procedural macros can now emit
1158 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1159 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1160 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1161 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1165 - [Added tier 3 support\* for the
1166 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1167 - [Added tier 3 support for the
1168 `aarch64-unknown-none-softfloat` target.][64589]
1169 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1170 `mips64el-unknown-linux-muslabi64` targets.][65843]
1172 \* Refer to Rust's [platform support page][forge-platform-support] for more
1173 information on Rust's tiered platform support.
1177 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1181 - [`BTreeMap::get_key_value`]
1182 - [`HashMap::get_key_value`]
1183 - [`Option::as_deref_mut`]
1184 - [`Option::as_deref`]
1185 - [`Option::flatten`]
1186 - [`UdpSocket::peer_addr`]
1187 - [`f32::to_be_bytes`]
1188 - [`f32::to_le_bytes`]
1189 - [`f32::to_ne_bytes`]
1190 - [`f64::to_be_bytes`]
1191 - [`f64::to_le_bytes`]
1192 - [`f64::to_ne_bytes`]
1193 - [`f32::from_be_bytes`]
1194 - [`f32::from_le_bytes`]
1195 - [`f32::from_ne_bytes`]
1196 - [`f64::from_be_bytes`]
1197 - [`f64::from_le_bytes`]
1198 - [`f64::from_ne_bytes`]
1205 - [Cargo will now always display warnings, rather than only on
1206 fresh builds.][cargo/7450]
1207 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1208 now produce an error.][cargo/7507] Previously these flags were ignored.
1209 - [You can now publish `dev-dependencies` without including
1210 a `version`.][cargo/7333]
1214 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1215 when running documentation tests with `rustdoc`.][63803]
1219 - [As previously announced, any previous NLL warnings in the 2015 edition are
1220 now hard errors.][64221]
1221 - [The `include!` macro will now warn if it failed to include the
1222 entire file.][64284] The `include!` macro unintentionally only includes the
1223 first _expression_ in a file, and this can be unintuitive. This will become
1224 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1225 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1226 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1227 or `extern` blocks now correctly emits a hard error.
1229 [65294]: https://github.com/rust-lang/rust/pull/65294/
1230 [66103]: https://github.com/rust-lang/rust/pull/66103/
1231 [65843]: https://github.com/rust-lang/rust/pull/65843/
1232 [65188]: https://github.com/rust-lang/rust/pull/65188/
1233 [65092]: https://github.com/rust-lang/rust/pull/65092/
1234 [64589]: https://github.com/rust-lang/rust/pull/64589/
1235 [64639]: https://github.com/rust-lang/rust/pull/64639/
1236 [64221]: https://github.com/rust-lang/rust/pull/64221/
1237 [64284]: https://github.com/rust-lang/rust/pull/64284/
1238 [63931]: https://github.com/rust-lang/rust/pull/63931/
1239 [64035]: https://github.com/rust-lang/rust/pull/64035/
1240 [63674]: https://github.com/rust-lang/rust/pull/63674/
1241 [63803]: https://github.com/rust-lang/rust/pull/63803/
1242 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1243 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1244 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1245 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1246 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1247 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1248 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1249 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1250 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1251 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1252 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1253 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1254 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1255 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1256 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1257 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1258 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1259 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1260 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1261 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1262 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1263 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1264 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1265 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1266 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1267 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1270 Version 1.39.0 (2019-11-07)
1271 ===========================
1275 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1276 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1277 - [You can now use certain attributes on function, closure, and function pointer
1278 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1279 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1280 attributes applied to items. e.g.
1283 #[cfg(windows)] slice: &[u16],
1284 #[cfg(not(windows))] slice: &[u8],
1289 - [You can now take shared references to bind-by-move patterns in the `if` guards
1290 of `match` arms.][63118] e.g.
1293 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1297 // ---- `nums` is bound by move.
1298 if nums.iter().sum::<u8>() == 10
1299 // ^------ `.iter()` implicitly takes a reference to `nums`.
1302 // ----------- Legal as `nums` was bound by move and so we have ownership.
1304 _ => unreachable!(),
1313 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1314 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1315 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1316 **Note** Cargo currently doesn't use this feature. Refer to
1317 [cargo#7315][cargo/7315] to track this feature's progress.
1318 - [You can now pass `--show-output` argument to test binaries to print the
1319 output of successful tests.][62600]
1322 \* Refer to Rust's [platform support page][forge-platform-support] for more
1323 information on Rust's tiered platform support.
1327 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1328 - [`LinkedList::new` is now a `const` function.][63684]
1329 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1330 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1331 now `const`.][63786]
1335 - [`Pin::into_inner`]
1336 - [`Instant::checked_duration_since`]
1337 - [`Instant::saturating_duration_since`]
1341 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1342 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1343 `--all` is now deprecated.
1347 - [You can now pass `-Clinker` to rustdoc to control the linker used
1348 for compiling doctests.][63834]
1352 - [Code that was previously accepted by the old borrow checker, but rejected by
1353 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1354 previously a warning, and will also become a hard error in the Rust 2015
1355 edition in the 1.40.0 release.
1356 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1357 run tests.][63827] This should improve performance when running a large
1359 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1360 recommended to use the `?` operator instead.
1361 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1364 [62600]: https://github.com/rust-lang/rust/pull/62600/
1365 [62672]: https://github.com/rust-lang/rust/pull/62672/
1366 [63118]: https://github.com/rust-lang/rust/pull/63118/
1367 [63209]: https://github.com/rust-lang/rust/pull/63209/
1368 [63402]: https://github.com/rust-lang/rust/pull/63402/
1369 [63565]: https://github.com/rust-lang/rust/pull/63565/
1370 [63595]: https://github.com/rust-lang/rust/pull/63595/
1371 [63684]: https://github.com/rust-lang/rust/pull/63684/
1372 [63698]: https://github.com/rust-lang/rust/pull/63698/
1373 [63770]: https://github.com/rust-lang/rust/pull/63770/
1374 [63786]: https://github.com/rust-lang/rust/pull/63786/
1375 [63827]: https://github.com/rust-lang/rust/pull/63827/
1376 [63834]: https://github.com/rust-lang/rust/pull/63834/
1377 [63927]: https://github.com/rust-lang/rust/pull/63927/
1378 [63933]: https://github.com/rust-lang/rust/pull/63933/
1379 [63934]: https://github.com/rust-lang/rust/pull/63934/
1380 [63938]: https://github.com/rust-lang/rust/pull/63938/
1381 [63940]: https://github.com/rust-lang/rust/pull/63940/
1382 [63941]: https://github.com/rust-lang/rust/pull/63941/
1383 [63945]: https://github.com/rust-lang/rust/pull/63945/
1384 [64010]: https://github.com/rust-lang/rust/pull/64010/
1385 [64028]: https://github.com/rust-lang/rust/pull/64028/
1386 [64334]: https://github.com/rust-lang/rust/pull/64334/
1387 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1388 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1389 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1390 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1391 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1392 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1394 Version 1.38.0 (2019-09-26)
1395 ==========================
1399 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1400 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1404 - [Added pipelined compilation support to `rustc`.][62766] This will
1405 improve compilation times in some cases. For further information please refer
1406 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1407 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1408 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1409 `x86_64-uwp-windows-msvc` targets.][60260]
1410 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1411 `armv7-unknown-linux-musleabi` targets.][63107]
1412 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1413 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1415 \* Refer to Rust's [platform support page][forge-platform-support] for more
1416 information on Rust's tiered platform support.
1420 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1421 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1422 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1423 is available at `std::clone::Clone`). This also makes all built-in macros
1424 available in `std`/`core` root. e.g. `std::include_bytes!`.
1425 - [`str::Chars` now implements `Debug`.][63000]
1426 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1427 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1428 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1429 - [Added euclidean remainder and division operations (`div_euclid`,
1430 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1431 `overflowing`, and `wrapping` versions are available for all
1433 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1434 `PartialEq`.][61491]
1435 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1439 - [`<*const T>::cast`]
1440 - [`<*mut T>::cast`]
1441 - [`Duration::as_secs_f32`]
1442 - [`Duration::as_secs_f64`]
1443 - [`Duration::div_f32`]
1444 - [`Duration::div_f64`]
1445 - [`Duration::from_secs_f32`]
1446 - [`Duration::from_secs_f64`]
1447 - [`Duration::mul_f32`]
1448 - [`Duration::mul_f64`]
1449 - [`any::type_name`]
1453 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1454 - [You can now pass the `--features` option multiple times to enable
1455 multiple features.][cargo/7084]
1459 - [`rustc` will now warn about some incorrect uses of
1460 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1464 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1466 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1467 issues][62896] with certain crates such as libc.
1469 [60260]: https://github.com/rust-lang/rust/pull/60260/
1470 [61457]: https://github.com/rust-lang/rust/pull/61457/
1471 [61491]: https://github.com/rust-lang/rust/pull/61491/
1472 [61884]: https://github.com/rust-lang/rust/pull/61884/
1473 [61953]: https://github.com/rust-lang/rust/pull/61953/
1474 [62042]: https://github.com/rust-lang/rust/pull/62042/
1475 [62528]: https://github.com/rust-lang/rust/pull/62528/
1476 [62583]: https://github.com/rust-lang/rust/pull/62583/
1477 [62735]: https://github.com/rust-lang/rust/pull/62735/
1478 [62766]: https://github.com/rust-lang/rust/pull/62766/
1479 [62784]: https://github.com/rust-lang/rust/pull/62784/
1480 [62785]: https://github.com/rust-lang/rust/issues/62785/
1481 [62814]: https://github.com/rust-lang/rust/pull/62814/
1482 [62896]: https://github.com/rust-lang/rust/issues/62896/
1483 [63000]: https://github.com/rust-lang/rust/pull/63000/
1484 [63056]: https://github.com/rust-lang/rust/pull/63056/
1485 [63107]: https://github.com/rust-lang/rust/pull/63107/
1486 [63346]: https://github.com/rust-lang/rust/pull/63346/
1487 [63421]: https://github.com/rust-lang/rust/pull/63421/
1488 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1489 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1490 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1491 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1492 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1493 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1494 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1495 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1496 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1497 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1498 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1499 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1500 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1501 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1502 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1504 Version 1.37.0 (2019-08-15)
1505 ==========================
1509 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1510 [`Box`][62228], or an [array][62235] and unused.
1511 - [You can now use the `cfg` and `cfg_attr` attributes on
1512 generic parameters.][61547]
1513 - [You can now use enum variants through type alias.][61682] e.g. You can
1514 write the following:
1516 type MyOption = Option<u8>;
1518 fn increment_or_zero(x: MyOption) -> u8 {
1520 MyOption::Some(y) => y + 1,
1521 MyOption::None => 0,
1525 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1526 `const _: u32 = 5;`.
1527 - [You can now use `#[repr(align(X)]` on enums.][61229]
1528 - [The `?` Kleene macro operator is now available in the
1529 2015 edition.][60932]
1533 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1534 and `-C profile-use` flags.][61268] For more information on how to use profile
1535 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1536 - [The `rust-lldb` wrapper script should now work again.][61827]
1540 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1544 - [`BufReader::buffer`]
1545 - [`BufWriter::buffer`]
1546 - [`Cell::from_mut`]
1547 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1548 - [`DoubleEndedIterator::nth_back`]
1550 - [`Wrapping::reverse_bits`]
1551 - [`i128::reverse_bits`]
1552 - [`i16::reverse_bits`]
1553 - [`i32::reverse_bits`]
1554 - [`i64::reverse_bits`]
1555 - [`i8::reverse_bits`]
1556 - [`isize::reverse_bits`]
1557 - [`slice::copy_within`]
1558 - [`u128::reverse_bits`]
1559 - [`u16::reverse_bits`]
1560 - [`u32::reverse_bits`]
1561 - [`u64::reverse_bits`]
1562 - [`u8::reverse_bits`]
1563 - [`usize::reverse_bits`]
1567 - [`Cargo.lock` files are now included by default when publishing executable crates
1568 with executables.][cargo/7026]
1569 - [You can now specify `default-run="foo"` in `[package]` to specify the
1570 default executable to use for `cargo run`.][cargo/7056]
1577 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1578 Please transition your code to using the `..=` syntax for inclusive
1580 - [Using a trait object without the `dyn` will now warn by default.][61203]
1581 Please transition your code to use `dyn Trait` for trait objects instead.
1583 [62228]: https://github.com/rust-lang/rust/pull/62228/
1584 [62235]: https://github.com/rust-lang/rust/pull/62235/
1585 [61802]: https://github.com/rust-lang/rust/pull/61802/
1586 [61827]: https://github.com/rust-lang/rust/pull/61827/
1587 [61547]: https://github.com/rust-lang/rust/pull/61547/
1588 [61682]: https://github.com/rust-lang/rust/pull/61682/
1589 [61268]: https://github.com/rust-lang/rust/pull/61268/
1590 [61342]: https://github.com/rust-lang/rust/pull/61342/
1591 [61347]: https://github.com/rust-lang/rust/pull/61347/
1592 [61100]: https://github.com/rust-lang/rust/pull/61100/
1593 [61203]: https://github.com/rust-lang/rust/pull/61203/
1594 [61229]: https://github.com/rust-lang/rust/pull/61229/
1595 [60932]: https://github.com/rust-lang/rust/pull/60932/
1596 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1597 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1598 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1599 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1600 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1601 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1602 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1603 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1604 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1605 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1606 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1607 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1608 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1609 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1610 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1611 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1612 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1613 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1614 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1615 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1616 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1617 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1618 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1619 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1622 Version 1.36.0 (2019-07-04)
1623 ==========================
1627 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1628 - [The order of traits in trait objects no longer affects the semantics of that
1629 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1630 `dyn fmt::Debug + Send`, where this was previously not the case.
1634 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1635 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1636 - [`mem::needs_drop` is now available as a const fn.][60364]
1637 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1638 - [`String` now implements `BorrowMut<str>`.][60404]
1639 - [`io::Cursor` now implements `Default`.][60234]
1640 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1641 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1642 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1643 environment has access to heap memory allocation.
1644 - [`String` now implements `From<&String>`.][59825]
1645 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1646 return a tuple of each argument when there is multiple arguments.
1647 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1652 - [`VecDeque::rotate_left`]
1653 - [`VecDeque::rotate_right`]
1654 - [`Iterator::copied`]
1656 - [`io::IoSliceMut`]
1657 - [`Read::read_vectored`]
1658 - [`Write::write_vectored`]
1659 - [`str::as_mut_ptr`]
1660 - [`mem::MaybeUninit`]
1661 - [`pointer::align_offset`]
1662 - [`future::Future`]
1664 - [`task::RawWaker`]
1665 - [`task::RawWakerVTable`]
1671 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1672 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1674 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1678 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1685 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1686 longer recommended, and will be deprecated in 1.39.0.
1688 [60318]: https://github.com/rust-lang/rust/pull/60318/
1689 [60364]: https://github.com/rust-lang/rust/pull/60364/
1690 [60370]: https://github.com/rust-lang/rust/pull/60370/
1691 [60404]: https://github.com/rust-lang/rust/pull/60404/
1692 [60234]: https://github.com/rust-lang/rust/pull/60234/
1693 [60244]: https://github.com/rust-lang/rust/pull/60244/
1694 [58623]: https://github.com/rust-lang/rust/pull/58623/
1695 [59648]: https://github.com/rust-lang/rust/pull/59648/
1696 [59675]: https://github.com/rust-lang/rust/pull/59675/
1697 [59825]: https://github.com/rust-lang/rust/pull/59825/
1698 [59826]: https://github.com/rust-lang/rust/pull/59826/
1699 [59445]: https://github.com/rust-lang/rust/pull/59445/
1700 [59114]: https://github.com/rust-lang/rust/pull/59114/
1701 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1702 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1703 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1704 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1705 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1706 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1707 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1708 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1709 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1710 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1711 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1712 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1713 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1714 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1715 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1716 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1717 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1718 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1719 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1720 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1723 Version 1.35.0 (2019-05-23)
1724 ==========================
1728 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1729 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1730 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1732 unsafe fn call_unsafe(func: unsafe fn()) {
1737 unsafe { call_unsafe(|| {}); }
1744 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1745 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1746 - [Added the `wasm32-unknown-wasi` target.][59464]
1751 - [`Thread` will now show its ID in `Debug` output.][59460]
1752 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1753 - [`alloc::System` now implements `Default`.][59451]
1754 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1756 - [`char::{ToLowercase, ToUppercase}` now
1757 implement `ExactSizeIterator`.][58778]
1758 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1759 - [Removed the `Read` trait bounds
1760 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1761 - [You can now call the `dbg!` macro without any parameters to print the file
1762 and line where it is called.][57847]
1763 - [In place ASCII case conversions are now up to 4× faster.][59283]
1764 e.g. `str::make_ascii_lowercase`
1765 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1772 - [`RefCell::replace_with`]
1773 - [`RefCell::map_split`]
1775 - [`Range::contains`]
1776 - [`RangeFrom::contains`]
1777 - [`RangeTo::contains`]
1778 - [`RangeInclusive::contains`]
1779 - [`RangeToInclusive::contains`]
1780 - [`Option::copied`]
1784 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1785 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1790 - [The Rust toolchain is now available natively for musl based distros.][58575]
1792 [59460]: https://github.com/rust-lang/rust/pull/59460/
1793 [59464]: https://github.com/rust-lang/rust/pull/59464/
1794 [59500]: https://github.com/rust-lang/rust/pull/59500/
1795 [59512]: https://github.com/rust-lang/rust/pull/59512/
1796 [59580]: https://github.com/rust-lang/rust/pull/59580/
1797 [59283]: https://github.com/rust-lang/rust/pull/59283/
1798 [59451]: https://github.com/rust-lang/rust/pull/59451/
1799 [59076]: https://github.com/rust-lang/rust/pull/59076/
1800 [58778]: https://github.com/rust-lang/rust/pull/58778/
1801 [58717]: https://github.com/rust-lang/rust/pull/58717/
1802 [58369]: https://github.com/rust-lang/rust/pull/58369/
1803 [58423]: https://github.com/rust-lang/rust/pull/58423/
1804 [58080]: https://github.com/rust-lang/rust/pull/58080/
1805 [57847]: https://github.com/rust-lang/rust/pull/57847/
1806 [58575]: https://github.com/rust-lang/rust/pull/58575
1807 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1808 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1809 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1810 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1811 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1812 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1813 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1814 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1815 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1816 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1817 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1818 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1820 Version 1.34.2 (2019-05-14)
1821 ===========================
1823 * [Destabilize the `Error::type_id` function due to a security
1824 vulnerability][60785] ([CVE-2019-12083])
1826 [60785]: https://github.com/rust-lang/rust/pull/60785
1827 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1829 Version 1.34.1 (2019-04-25)
1830 ===========================
1832 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1833 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1834 * [Fix Clippy panic when checking some macros][clippy/3805]
1836 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1837 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1838 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1840 Version 1.34.0 (2019-04-11)
1841 ==========================
1845 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1846 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1848 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1849 `#[attr{}]` procedural macros.][57367]
1850 - [You can now write `extern crate self as foo;`][57407] to import your
1851 crate's root into the extern prelude.
1856 - [You can now target `riscv64imac-unknown-none-elf` and
1857 `riscv64gc-unknown-none-elf`.][58406]
1858 - [You can now enable linker plugin LTO optimisations with
1859 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1860 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1862 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1867 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1868 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1869 the `Hash` trait to create an iterator.
1870 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1871 methods.][58421] Most notably you no longer require the `Ord` trait to create
1873 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1874 for all numeric types.][58044]
1875 - [Indexing a `str` is now generic over all types that
1876 implement `SliceIndex<str>`.][57604]
1877 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1878 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1879 produce a warning if their returning type is unused.
1880 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1881 `overflowing_pow` are now available for all numeric types.][57873] These are
1882 equivalent to methods such as `wrapping_add` for the `pow` operation.
1890 * [`Error::type_id`]
1891 * [`atomic::AtomicI16`]
1892 * [`atomic::AtomicI32`]
1893 * [`atomic::AtomicI64`]
1894 * [`atomic::AtomicI8`]
1895 * [`atomic::AtomicU16`]
1896 * [`atomic::AtomicU32`]
1897 * [`atomic::AtomicU64`]
1898 * [`atomic::AtomicU8`]
1899 * [`convert::Infallible`]
1900 * [`convert::TryFrom`]
1901 * [`convert::TryInto`]
1903 * [`iter::successors`]
1904 * [`num::NonZeroI128`]
1905 * [`num::NonZeroI16`]
1906 * [`num::NonZeroI32`]
1907 * [`num::NonZeroI64`]
1908 * [`num::NonZeroI8`]
1909 * [`num::NonZeroIsize`]
1910 * [`slice::sort_by_cached_key`]
1911 * [`str::escape_debug`]
1912 * [`str::escape_default`]
1913 * [`str::escape_unicode`]
1914 * [`str::split_ascii_whitespace`]
1917 * [`Instant::checked_add`]
1918 * [`Instant::checked_sub`]
1919 * [`SystemTime::checked_add`]
1920 * [`SystemTime::checked_sub`]
1924 - [You can now use alternative registries to crates.io.][cargo/6654]
1928 - [You can now use the `?` operator in your documentation tests without manually
1929 adding `fn main() -> Result<(), _> {}`.][56470]
1933 - [`Command::before_exec` is being replaced by the unsafe method
1934 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1935 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1936 can now use `const` functions in `static` variables.
1938 [58370]: https://github.com/rust-lang/rust/pull/58370/
1939 [58406]: https://github.com/rust-lang/rust/pull/58406/
1940 [58421]: https://github.com/rust-lang/rust/pull/58421/
1941 [58166]: https://github.com/rust-lang/rust/pull/58166/
1942 [58044]: https://github.com/rust-lang/rust/pull/58044/
1943 [58057]: https://github.com/rust-lang/rust/pull/58057/
1944 [58059]: https://github.com/rust-lang/rust/pull/58059/
1945 [57809]: https://github.com/rust-lang/rust/pull/57809/
1946 [57873]: https://github.com/rust-lang/rust/pull/57873/
1947 [57604]: https://github.com/rust-lang/rust/pull/57604/
1948 [57367]: https://github.com/rust-lang/rust/pull/57367/
1949 [57407]: https://github.com/rust-lang/rust/pull/57407/
1950 [57425]: https://github.com/rust-lang/rust/pull/57425/
1951 [57106]: https://github.com/rust-lang/rust/pull/57106/
1952 [56470]: https://github.com/rust-lang/rust/pull/56470/
1953 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1954 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1955 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1956 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1957 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1958 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1959 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1960 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1961 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1962 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1963 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1964 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1965 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1966 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1967 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1968 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1969 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1970 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1971 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1972 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1973 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1974 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1975 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1976 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1977 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1978 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1979 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1980 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1981 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1982 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1983 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1986 Version 1.33.0 (2019-02-28)
1987 ==========================
1991 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1992 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1993 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1994 E.g. You can have match statement on a `u8` that covers `0..=255` and
1995 you would no longer be required to have a `_ => unreachable!()` case.
1996 - [You can now have multiple patterns in `if let` and `while let`
1997 expressions.][57532] You can do this with the same syntax as a `match`
2007 let state = Creature::Crab("Ferris");
2009 if let Creature::Crab(name) | Creature::Person(name) = state {
2010 println!("This creature's name is: {}", name);
2014 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2015 this feature will by default produce a warning as this behaviour can be
2016 unintuitive. E.g. `if let _ = 5 {}`
2017 - [You can now use `let` bindings, assignments, expression statements,
2018 and irrefutable pattern destructuring in const functions.][57175]
2019 - [You can now call unsafe const functions.][57067] E.g.
2021 const unsafe fn foo() -> i32 { 5 }
2022 const fn bar() -> i32 {
2026 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2027 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2028 - [You can now specify a specific alignment with the `#[repr(packed)]`
2029 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2030 with an alignment of 2 bytes and a size of 6 bytes.
2031 - [You can now import an item from a module as an `_`.][56303] This allows you to
2032 import a trait's impls, and not have the name in the namespace. E.g.
2034 use std::io::Read as _;
2036 // Allowed as there is only one `Read` in the module.
2039 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2043 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2044 command line argument.][56351]
2045 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2046 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2047 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2048 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2049 information on Rust's platform support.
2050 - [Added support for the `thumbv7neon-linux-androideabi` and
2051 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2052 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2056 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2057 functions for all numeric types.][57566]
2058 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2059 are now `const` functions for all numeric types.][57105]
2060 - [The methods `is_positive` and `is_negative` are now `const` functions for
2061 all signed numeric types.][57105]
2062 - [The `get` method for all `NonZero` types is now `const`.][57167]
2063 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2064 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2065 numeric types.][57234]
2066 - [`Ipv4Addr::new` is now a `const` function][57234]
2070 - [`unix::FileExt::read_exact_at`]
2071 - [`unix::FileExt::write_all_at`]
2072 - [`Option::transpose`]
2073 - [`Result::transpose`]
2074 - [`convert::identity`]
2077 - [`marker::PhantomPinned`]
2078 - [`Vec::resize_with`]
2079 - [`VecDeque::resize_with`]
2080 - [`Duration::as_millis`]
2081 - [`Duration::as_micros`]
2082 - [`Duration::as_nanos`]
2087 - [You can now publish crates that require a feature flag to compile with
2088 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2089 - [Cargo should now rebuild a crate if a file was modified during the initial
2094 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2095 are now deprecated in the standard library, and their usage will now produce a warning.
2096 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2098 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2100 - [Libtest no longer creates a new thread for each test when
2101 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2103 [55982]: https://github.com/rust-lang/rust/pull/55982/
2104 [56243]: https://github.com/rust-lang/rust/pull/56243
2105 [56303]: https://github.com/rust-lang/rust/pull/56303/
2106 [56351]: https://github.com/rust-lang/rust/pull/56351/
2107 [56362]: https://github.com/rust-lang/rust/pull/56362
2108 [56642]: https://github.com/rust-lang/rust/pull/56642/
2109 [56769]: https://github.com/rust-lang/rust/pull/56769/
2110 [56805]: https://github.com/rust-lang/rust/pull/56805
2111 [56947]: https://github.com/rust-lang/rust/pull/56947/
2112 [57049]: https://github.com/rust-lang/rust/pull/57049/
2113 [57067]: https://github.com/rust-lang/rust/pull/57067/
2114 [57105]: https://github.com/rust-lang/rust/pull/57105
2115 [57130]: https://github.com/rust-lang/rust/pull/57130/
2116 [57167]: https://github.com/rust-lang/rust/pull/57167/
2117 [57175]: https://github.com/rust-lang/rust/pull/57175/
2118 [57234]: https://github.com/rust-lang/rust/pull/57234/
2119 [57332]: https://github.com/rust-lang/rust/pull/57332/
2120 [57465]: https://github.com/rust-lang/rust/pull/57465/
2121 [57532]: https://github.com/rust-lang/rust/pull/57532/
2122 [57535]: https://github.com/rust-lang/rust/pull/57535/
2123 [57566]: https://github.com/rust-lang/rust/pull/57566/
2124 [57615]: https://github.com/rust-lang/rust/pull/57615/
2125 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2126 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2127 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2128 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2129 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2130 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2131 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2132 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2133 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2134 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2135 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2136 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2137 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2138 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2139 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2140 [platform-support]: https://forge.rust-lang.org/platform-support.html
2142 Version 1.32.0 (2019-01-17)
2143 ==========================
2148 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2149 operator allows you to specify zero or one repetitions similar to the `*` and
2151 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2152 now always resolve to the item (`enum`, `struct`, etc.) available in the
2153 module if present, before resolving to a external crate or an item the prelude.][56759]
2156 enum Color { Red, Green, Blue }
2162 - [You can now match against `PhantomData<T>` types.][55837]
2163 - [You can now match against literals in macros with the `literal`
2164 specifier.][56072] This will match against a literal of any type.
2165 E.g. `1`, `'A'`, `"Hello World"`
2166 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2168 struct Point(i32, i32);
2171 pub fn new(x: i32, y: i32) -> Self {
2175 pub fn is_origin(&self) -> bool {
2183 - [Self can also now be used in type definitions.][56366] E.g.
2187 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2190 Cons(T, Box<Self>) // likewise here
2193 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2194 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2198 - [The default allocator has changed from jemalloc to the default allocator on
2199 your system.][55238] The compiler itself on Linux & macOS will still use
2200 jemalloc, but programs compiled with it will use the system allocator.
2201 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2205 - [`PathBuf` now implements `FromStr`.][55148]
2206 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2207 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2208 easily debug expressions in your rust program. E.g.
2211 let b = dbg!(a * 2) + 1;
2212 // ^-- prints: [src/main.rs:4] a * 2 = 4
2216 The following APIs are now `const` functions and can be used in a
2220 - [`UnsafeCell::get`]
2221 - [`char::is_ascii`]
2223 - [`ManuallyDrop::new`]
2224 - [`ManuallyDrop::into_inner`]
2225 - [`RangeInclusive::start`]
2226 - [`RangeInclusive::end`]
2227 - [`NonNull::as_ptr`]
2230 - [`Duration::as_secs`]
2231 - [`Duration::subsec_millis`]
2232 - [`Duration::subsec_micros`]
2233 - [`Duration::subsec_nanos`]
2235 - [`Ipv4Addr::is_unspecified`]
2237 - [`Ipv6Addr::octets`]
2241 - [`i8::to_be_bytes`]
2242 - [`i8::to_le_bytes`]
2243 - [`i8::to_ne_bytes`]
2244 - [`i8::from_be_bytes`]
2245 - [`i8::from_le_bytes`]
2246 - [`i8::from_ne_bytes`]
2247 - [`i16::to_be_bytes`]
2248 - [`i16::to_le_bytes`]
2249 - [`i16::to_ne_bytes`]
2250 - [`i16::from_be_bytes`]
2251 - [`i16::from_le_bytes`]
2252 - [`i16::from_ne_bytes`]
2253 - [`i32::to_be_bytes`]
2254 - [`i32::to_le_bytes`]
2255 - [`i32::to_ne_bytes`]
2256 - [`i32::from_be_bytes`]
2257 - [`i32::from_le_bytes`]
2258 - [`i32::from_ne_bytes`]
2259 - [`i64::to_be_bytes`]
2260 - [`i64::to_le_bytes`]
2261 - [`i64::to_ne_bytes`]
2262 - [`i64::from_be_bytes`]
2263 - [`i64::from_le_bytes`]
2264 - [`i64::from_ne_bytes`]
2265 - [`i128::to_be_bytes`]
2266 - [`i128::to_le_bytes`]
2267 - [`i128::to_ne_bytes`]
2268 - [`i128::from_be_bytes`]
2269 - [`i128::from_le_bytes`]
2270 - [`i128::from_ne_bytes`]
2271 - [`isize::to_be_bytes`]
2272 - [`isize::to_le_bytes`]
2273 - [`isize::to_ne_bytes`]
2274 - [`isize::from_be_bytes`]
2275 - [`isize::from_le_bytes`]
2276 - [`isize::from_ne_bytes`]
2277 - [`u8::to_be_bytes`]
2278 - [`u8::to_le_bytes`]
2279 - [`u8::to_ne_bytes`]
2280 - [`u8::from_be_bytes`]
2281 - [`u8::from_le_bytes`]
2282 - [`u8::from_ne_bytes`]
2283 - [`u16::to_be_bytes`]
2284 - [`u16::to_le_bytes`]
2285 - [`u16::to_ne_bytes`]
2286 - [`u16::from_be_bytes`]
2287 - [`u16::from_le_bytes`]
2288 - [`u16::from_ne_bytes`]
2289 - [`u32::to_be_bytes`]
2290 - [`u32::to_le_bytes`]
2291 - [`u32::to_ne_bytes`]
2292 - [`u32::from_be_bytes`]
2293 - [`u32::from_le_bytes`]
2294 - [`u32::from_ne_bytes`]
2295 - [`u64::to_be_bytes`]
2296 - [`u64::to_le_bytes`]
2297 - [`u64::to_ne_bytes`]
2298 - [`u64::from_be_bytes`]
2299 - [`u64::from_le_bytes`]
2300 - [`u64::from_ne_bytes`]
2301 - [`u128::to_be_bytes`]
2302 - [`u128::to_le_bytes`]
2303 - [`u128::to_ne_bytes`]
2304 - [`u128::from_be_bytes`]
2305 - [`u128::from_le_bytes`]
2306 - [`u128::from_ne_bytes`]
2307 - [`usize::to_be_bytes`]
2308 - [`usize::to_le_bytes`]
2309 - [`usize::to_ne_bytes`]
2310 - [`usize::from_be_bytes`]
2311 - [`usize::from_le_bytes`]
2312 - [`usize::from_ne_bytes`]
2316 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2317 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2321 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2325 - [The argument types for AVX's
2326 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2327 been changed from `*const` to `*mut` as the previous implementation
2331 [55148]: https://github.com/rust-lang/rust/pull/55148/
2332 [55238]: https://github.com/rust-lang/rust/pull/55238/
2333 [55280]: https://github.com/rust-lang/rust/pull/55280/
2334 [55610]: https://github.com/rust-lang/rust/pull/55610/
2335 [55663]: https://github.com/rust-lang/rust/pull/55663/
2336 [55702]: https://github.com/rust-lang/rust/pull/55702/
2337 [55837]: https://github.com/rust-lang/rust/pull/55837/
2338 [55843]: https://github.com/rust-lang/rust/pull/55843/
2339 [56072]: https://github.com/rust-lang/rust/pull/56072/
2340 [56245]: https://github.com/rust-lang/rust/pull/56245/
2341 [56365]: https://github.com/rust-lang/rust/pull/56365/
2342 [56366]: https://github.com/rust-lang/rust/pull/56366/
2343 [56395]: https://github.com/rust-lang/rust/pull/56395/
2344 [56759]: https://github.com/rust-lang/rust/pull/56759/
2345 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2346 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2347 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2348 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2349 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2350 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2351 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2352 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2353 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2354 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2355 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2356 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2357 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2358 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2359 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2360 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2361 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2362 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2363 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2364 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2365 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2366 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2367 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2368 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2369 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2370 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2371 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2372 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2373 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2374 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2375 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2376 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2377 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2378 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2379 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2380 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2381 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2382 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2383 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2384 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2385 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2386 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2387 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2388 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2389 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2390 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2391 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2392 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2393 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2394 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2395 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2396 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2397 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2398 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2399 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2400 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2401 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2402 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2403 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2404 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2405 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2406 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2407 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2408 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2409 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2410 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2411 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2412 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2413 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2414 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2415 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2416 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2417 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2418 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2419 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2420 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2421 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2422 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2423 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2424 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2425 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2426 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2427 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2428 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2429 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2430 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2431 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2432 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2433 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2434 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2435 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2436 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2437 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2440 Version 1.31.1 (2018-12-20)
2441 ===========================
2443 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2444 - [Fix broken go-to-definition in RLS][rls/1171]
2445 - [Fix infinite loop on hover in RLS][rls/1170]
2447 [56562]: https://github.com/rust-lang/rust/pull/56562
2448 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2449 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2451 Version 1.31.0 (2018-12-06)
2452 ==========================
2456 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2457 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2458 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2459 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2461 - [You can now define and use `const` functions.][54835] These are currently
2462 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2463 [language reference][const-reference] for what exactly is available.
2464 - [You can now use tool lints, which allow you to scope lints from external
2465 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2466 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2467 a crate, not just in exported functions.][54451]
2468 - [You can now use parentheses in pattern matches.][54497]
2472 - [Updated musl to 1.1.20][54430]
2476 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2477 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2478 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2479 into `Option<&mut T>` using the `From` trait.][53218]
2480 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2485 - [`slice::align_to`]
2486 - [`slice::align_to_mut`]
2487 - [`slice::chunks_exact`]
2488 - [`slice::chunks_exact_mut`]
2489 - [`slice::rchunks`]
2490 - [`slice::rchunks_mut`]
2491 - [`slice::rchunks_exact`]
2492 - [`slice::rchunks_exact_mut`]
2493 - [`Option::replace`]
2497 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2498 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2499 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2501 [52813]: https://github.com/rust-lang/rust/pull/52813/
2502 [53218]: https://github.com/rust-lang/rust/pull/53218/
2503 [53555]: https://github.com/rust-lang/rust/issues/53555/
2504 [54057]: https://github.com/rust-lang/rust/pull/54057/
2505 [54240]: https://github.com/rust-lang/rust/pull/54240/
2506 [54430]: https://github.com/rust-lang/rust/pull/54430/
2507 [54451]: https://github.com/rust-lang/rust/pull/54451/
2508 [54497]: https://github.com/rust-lang/rust/pull/54497/
2509 [54778]: https://github.com/rust-lang/rust/pull/54778/
2510 [54835]: https://github.com/rust-lang/rust/pull/54835/
2511 [54870]: https://github.com/rust-lang/rust/pull/54870/
2512 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2513 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2514 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2515 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2516 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2517 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2518 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2519 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2520 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2521 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2522 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2523 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2524 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2525 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2527 Version 1.30.1 (2018-11-08)
2528 ===========================
2530 - [Fixed overflow ICE in rustdoc][54199]
2531 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2533 [54199]: https://github.com/rust-lang/rust/pull/54199
2534 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2536 Version 1.30.0 (2018-10-25)
2537 ==========================
2541 - [Procedural macros are now available.][52081] These kinds of macros allow for
2542 more powerful code generation. There is a [new chapter available][proc-macros]
2543 in the Rust Programming Language book that goes further in depth.
2544 - [You can now use keywords as identifiers using the raw identifiers
2545 syntax (`r#`),][53236] e.g. `let r#for = true;`
2546 - [Using anonymous parameters in traits is now deprecated with a warning and
2547 will be a hard error in the 2018 edition.][53272]
2548 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2549 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2550 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2551 Previously, using a external crate in a module without a use statement
2552 required `let json = ::serde_json::from_str(foo);` but can now be written
2553 as `let json = serde_json::from_str(foo);`.
2554 - [You can now apply the `#[used]` attribute to static items to prevent the
2555 compiler from optimising them away, even if they appear to be unused,][51363]
2556 e.g. `#[used] static FOO: u32 = 1;`
2557 - [You can now import and reexport macros from other crates with the `use`
2558 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2559 the root module of the crate. If your macro relies on calling other local
2560 macros, it is recommended to export with the
2561 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2563 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2564 using the `vis` specifier.][53370]
2565 - [Non-macro attributes now allow all forms of literals, not just
2566 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2567 write `#[attr(true)]`.
2568 - [You can now specify a function to handle a panic in the Rust runtime with the
2569 `#[panic_handler]` attribute.][51366]
2573 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2574 - [Added the `aarch64-unknown-netbsd` target][53165]
2578 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2582 - [`Ipv4Addr::BROADCAST`]
2583 - [`Ipv4Addr::LOCALHOST`]
2584 - [`Ipv4Addr::UNSPECIFIED`]
2585 - [`Ipv6Addr::LOCALHOST`]
2586 - [`Ipv6Addr::UNSPECIFIED`]
2587 - [`Iterator::find_map`]
2589 The following methods are replacement methods for `trim_left`, `trim_right`,
2590 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2592 - [`str::trim_end_matches`]
2594 - [`str::trim_start_matches`]
2595 - [`str::trim_start`]
2599 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2600 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2601 equivalent to calling `rustdoc --error-format=json`.
2602 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2606 - [`rustdoc` allows you to specify what edition to treat your code as with the
2607 `--edition` option.][54057]
2608 - [`rustdoc` now has the `--color` (specify whether to output color) and
2609 `--error-format` (specify error format, e.g. `json`) options.][53003]
2610 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2611 debug symbols.][53774]
2612 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2613 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2615 [50911]: https://github.com/rust-lang/rust/pull/50911/
2616 [51363]: https://github.com/rust-lang/rust/pull/51363/
2617 [51366]: https://github.com/rust-lang/rust/pull/51366/
2618 [52081]: https://github.com/rust-lang/rust/pull/52081/
2619 [53003]: https://github.com/rust-lang/rust/pull/53003/
2620 [53033]: https://github.com/rust-lang/rust/pull/53033/
2621 [53044]: https://github.com/rust-lang/rust/pull/53044/
2622 [53165]: https://github.com/rust-lang/rust/pull/53165/
2623 [53213]: https://github.com/rust-lang/rust/pull/53213/
2624 [53236]: https://github.com/rust-lang/rust/pull/53236/
2625 [53272]: https://github.com/rust-lang/rust/pull/53272/
2626 [53370]: https://github.com/rust-lang/rust/pull/53370/
2627 [53459]: https://github.com/rust-lang/rust/pull/53459/
2628 [53774]: https://github.com/rust-lang/rust/pull/53774/
2629 [53822]: https://github.com/rust-lang/rust/pull/53822/
2630 [54057]: https://github.com/rust-lang/rust/pull/54057/
2631 [54146]: https://github.com/rust-lang/rust/pull/54146/
2632 [54404]: https://github.com/rust-lang/rust/pull/54404/
2633 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2634 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2635 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2636 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2638 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2639 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2640 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2641 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2642 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2643 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2644 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2645 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2646 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2647 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2650 Version 1.29.2 (2018-10-11)
2651 ===========================
2653 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2654 - The `rls-preview` component on the windows-gnu targets has been restored.
2656 [54639]: https://github.com/rust-lang/rust/pull/54639
2659 Version 1.29.1 (2018-09-25)
2660 ===========================
2665 - The standard library's `str::repeat` function contained an out of bounds write
2666 caused by an integer overflow. This has been fixed by deterministically
2667 panicking when an overflow happens.
2669 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2673 Version 1.29.0 (2018-09-13)
2674 ==========================
2678 - [Bumped minimum LLVM version to 5.0.][51899]
2679 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2680 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2684 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2685 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2686 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2687 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2689 - [`Cell<T>` now allows `T` to be unsized.][50494]
2690 - [`SocketAddr` is now stable on Redox.][52656]
2695 - [`Iterator::flatten`]
2700 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2701 `--locked` to disable this behavior.
2702 - [`cargo-install` will now allow you to cross compile an install
2703 using `--target`.][cargo/5614]
2704 - [Added the `cargo-fix` subcommand to automatically move project code from
2705 2015 edition to 2018.][cargo/5723]
2706 - [`cargo doc` can now optionally document private types using the
2707 `--document-private-items` flag.][cargo/5543]
2711 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2712 the specified level to that level.][52354] For example `--cap-lints warn`
2713 will demote `deny` and `forbid` lints to `warn`.
2714 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2715 fails and `101` if there is a panic.][52197]
2716 - [A preview of clippy has been made available through rustup.][51122]
2717 You can install the preview with `rustup component add clippy-preview`.
2721 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2722 Use `str::get_unchecked(begin..end)` instead.
2723 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2724 Consider using the `home_dir` function from
2725 https://crates.io/crates/dirs instead.
2726 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2727 - [`cfg` attributes and `--cfg` command line flags are now more
2728 strictly validated.][53893]
2730 [53893]: https://github.com/rust-lang/rust/pull/53893/
2731 [52861]: https://github.com/rust-lang/rust/pull/52861/
2732 [52656]: https://github.com/rust-lang/rust/pull/52656/
2733 [52239]: https://github.com/rust-lang/rust/pull/52239/
2734 [52330]: https://github.com/rust-lang/rust/pull/52330/
2735 [52354]: https://github.com/rust-lang/rust/pull/52354/
2736 [52402]: https://github.com/rust-lang/rust/pull/52402/
2737 [52103]: https://github.com/rust-lang/rust/pull/52103/
2738 [52197]: https://github.com/rust-lang/rust/pull/52197/
2739 [51807]: https://github.com/rust-lang/rust/pull/51807/
2740 [51899]: https://github.com/rust-lang/rust/pull/51899/
2741 [51912]: https://github.com/rust-lang/rust/pull/51912/
2742 [51511]: https://github.com/rust-lang/rust/pull/51511/
2743 [51619]: https://github.com/rust-lang/rust/pull/51619/
2744 [51656]: https://github.com/rust-lang/rust/pull/51656/
2745 [51178]: https://github.com/rust-lang/rust/pull/51178/
2746 [51122]: https://github.com/rust-lang/rust/pull/51122
2747 [50494]: https://github.com/rust-lang/rust/pull/50494/
2748 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2749 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2750 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2751 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2752 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2753 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2754 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2757 Version 1.28.0 (2018-08-02)
2758 ===========================
2762 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2763 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2764 the inner type across Foreign Function Interface (FFI) boundaries.
2765 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2766 and can now be used as identifiers.][51196]
2767 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2768 stable.][51241] This will allow users to specify a global allocator for
2770 - [Unit test functions marked with the `#[test]` attribute can now return
2771 `Result<(), E: Debug>` in addition to `()`.][51298]
2772 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2773 allows macros to easily target lifetimes.
2777 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2778 prioritise making smaller binary sizes. `z` is the same as `s` with the
2779 exception that it does not vectorise loops, which typically results in an even
2781 - [The short error format is now stable.][49546] Specified with
2782 `--error-format=short` this option will provide a more compressed output of
2783 rust error messages.
2784 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2785 - [Reduced the number of allocations in the macro parser.][50855] This can
2786 improve compile times of macro heavy crates on average by 5%.
2790 - [Implemented `Default` for `&mut str`.][51306]
2791 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2792 - [Implemented `Extend` for `()`.][50234]
2793 - [The `Debug` implementation of `time::Duration` should now be more easily
2794 human readable.][50364] Previously a `Duration` of one second would printed as
2795 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2796 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2797 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2798 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2799 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2800 for `PathBuf`.][50170]
2801 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2802 and `Wrapping<i128>`.][50465]
2803 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2804 possible.][51050] This can provide up to a 40% speed increase.
2805 - [Improved error messages when using `format!`.][50610]
2809 - [`Iterator::step_by`]
2810 - [`Path::ancestors`]
2811 - [`SystemTime::UNIX_EPOCH`]
2812 - [`alloc::GlobalAlloc`]
2814 - [`alloc::LayoutErr`]
2817 - [`alloc::alloc_zeroed`]
2818 - [`alloc::dealloc`]
2819 - [`alloc::realloc`]
2820 - [`alloc::handle_alloc_error`]
2821 - [`btree_map::Entry::or_default`]
2822 - [`fmt::Alignment`]
2823 - [`hash_map::Entry::or_default`]
2824 - [`iter::repeat_with`]
2825 - [`num::NonZeroUsize`]
2826 - [`num::NonZeroU128`]
2827 - [`num::NonZeroU16`]
2828 - [`num::NonZeroU32`]
2829 - [`num::NonZeroU64`]
2830 - [`num::NonZeroU8`]
2831 - [`ops::RangeBounds`]
2832 - [`slice::SliceIndex`]
2833 - [`slice::from_mut`]
2834 - [`slice::from_ref`]
2835 - [`{Any + Send + Sync}::downcast_mut`]
2836 - [`{Any + Send + Sync}::downcast_ref`]
2837 - [`{Any + Send + Sync}::is`]
2841 - [Cargo will now no longer allow you to publish crates with build scripts that
2842 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2843 considered to be immutable.
2847 - [The `suggestion_applicability` field in `rustc`'s json output is now
2848 stable.][50486] This will allow dev tools to check whether a code suggestion
2849 would apply to them.
2853 - [Rust will consider trait objects with duplicated constraints to be the same
2854 type as without the duplicated constraint.][51276] For example the below code will
2855 now fail to compile.
2860 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2863 impl Trait + Send + Send {
2864 fn test(&self) { println!("two"); }
2868 [49546]: https://github.com/rust-lang/rust/pull/49546/
2869 [50143]: https://github.com/rust-lang/rust/pull/50143/
2870 [50170]: https://github.com/rust-lang/rust/pull/50170/
2871 [50234]: https://github.com/rust-lang/rust/pull/50234/
2872 [50265]: https://github.com/rust-lang/rust/pull/50265/
2873 [50364]: https://github.com/rust-lang/rust/pull/50364/
2874 [50385]: https://github.com/rust-lang/rust/pull/50385/
2875 [50465]: https://github.com/rust-lang/rust/pull/50465/
2876 [50486]: https://github.com/rust-lang/rust/pull/50486/
2877 [50554]: https://github.com/rust-lang/rust/pull/50554/
2878 [50610]: https://github.com/rust-lang/rust/pull/50610/
2879 [50855]: https://github.com/rust-lang/rust/pull/50855/
2880 [51050]: https://github.com/rust-lang/rust/pull/51050/
2881 [51196]: https://github.com/rust-lang/rust/pull/51196/
2882 [51200]: https://github.com/rust-lang/rust/pull/51200/
2883 [51241]: https://github.com/rust-lang/rust/pull/51241/
2884 [51276]: https://github.com/rust-lang/rust/pull/51276/
2885 [51298]: https://github.com/rust-lang/rust/pull/51298/
2886 [51306]: https://github.com/rust-lang/rust/pull/51306/
2887 [51562]: https://github.com/rust-lang/rust/pull/51562/
2888 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2889 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2890 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2891 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2892 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2893 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2894 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2895 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2896 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2897 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2898 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2899 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2900 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2901 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2902 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2903 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2904 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2905 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2906 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2907 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2908 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2909 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2910 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2911 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2912 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2913 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2914 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2915 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2916 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2917 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2919 Version 1.27.2 (2018-07-20)
2920 ===========================
2925 - The borrow checker was fixed to avoid potential unsoundness when using
2926 match ergonomics: [#52213][52213].
2928 [52213]: https://github.com/rust-lang/rust/issues/52213
2930 Version 1.27.1 (2018-07-10)
2931 ===========================
2936 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2937 when running, which enabled executing code as some other user on a
2938 given machine. This release fixes that vulnerability; you can read
2939 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2941 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2946 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2947 match ergonomics: [#51415][51415], [#49534][49534].
2949 [51415]: https://github.com/rust-lang/rust/issues/51415
2950 [49534]: https://github.com/rust-lang/rust/issues/49534
2951 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2952 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2954 Version 1.27.0 (2018-06-21)
2955 ==========================
2959 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2960 be used as an identifier.
2961 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2962 bare `Trait` syntax, and should make it clearer when being used in tandem with
2963 `impl Trait` because it is equivalent to the following syntax:
2964 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2965 `Box<Trait> == Box<dyn Trait>`.
2966 - [Attributes on generic parameters such as types and lifetimes are
2967 now stable.][48851] e.g.
2968 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2969 - [The `#[must_use]` attribute can now also be used on functions as well as
2970 types.][48925] It provides a lint that by default warns users when the
2971 value returned by a function has not been used.
2975 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2979 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2980 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2981 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2982 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2983 the `cfg` attribute.
2984 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2985 std are now available in core.][49896]
2986 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2988 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2989 that the operation isn't done in place.
2990 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2991 the `#[must_use]` attribute][49533] to warn about unused potentially
2992 expensive allocations.
2996 - [`DoubleEndedIterator::rfind`]
2997 - [`DoubleEndedIterator::rfold`]
2998 - [`DoubleEndedIterator::try_rfold`]
2999 - [`Duration::from_micros`]
3000 - [`Duration::from_nanos`]
3001 - [`Duration::subsec_micros`]
3002 - [`Duration::subsec_millis`]
3003 - [`HashMap::remove_entry`]
3004 - [`Iterator::try_fold`]
3005 - [`Iterator::try_for_each`]
3007 - [`Option::filter`]
3008 - [`String::replace_range`]
3009 - [`Take::set_limit`]
3010 - [`hint::unreachable_unchecked`]
3011 - [`os::unix::process::parent_id`]
3012 - [`ptr::swap_nonoverlapping`]
3013 - [`slice::rsplit_mut`]
3015 - [`slice::swap_with_slice`]
3019 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3020 `readme`, and `repository` fields.][cargo/5386]
3021 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3022 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3023 a different directory than `target` for placing compilation artifacts.
3024 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3025 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3026 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3027 where cargo would infer a binary, Cargo will produce a warning. You can
3028 disable this feature ahead of time by setting any of the following to false:
3029 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3030 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3031 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3035 - [Added “The Rustc book” into the official documentation.][49707]
3036 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3037 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3041 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3042 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3043 compile, `"".is_empty()` will still compile.
3044 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3045 will only print the inner type.][48553] E.g.
3046 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3047 not `AtomicBool(true)`.
3048 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3049 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3050 alignment should cover all use cases.
3051 - The `.description()` method on the `std::error::Error` trait
3052 [has been soft-deprecated][50163]. It is no longer required to implement it.
3054 [48553]: https://github.com/rust-lang/rust/pull/48553/
3055 [48851]: https://github.com/rust-lang/rust/pull/48851/
3056 [48925]: https://github.com/rust-lang/rust/pull/48925/
3057 [49533]: https://github.com/rust-lang/rust/pull/49533/
3058 [49623]: https://github.com/rust-lang/rust/pull/49623/
3059 [49630]: https://github.com/rust-lang/rust/pull/49630/
3060 [49664]: https://github.com/rust-lang/rust/pull/49664/
3061 [49699]: https://github.com/rust-lang/rust/pull/49699/
3062 [49707]: https://github.com/rust-lang/rust/pull/49707/
3063 [49719]: https://github.com/rust-lang/rust/pull/49719/
3064 [49896]: https://github.com/rust-lang/rust/pull/49896/
3065 [49968]: https://github.com/rust-lang/rust/pull/49968/
3066 [50163]: https://github.com/rust-lang/rust/pull/50163
3067 [50177]: https://github.com/rust-lang/rust/pull/50177/
3068 [50378]: https://github.com/rust-lang/rust/pull/50378/
3069 [50398]: https://github.com/rust-lang/rust/pull/50398/
3070 [50423]: https://github.com/rust-lang/rust/pull/50423/
3071 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3072 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3073 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3074 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3075 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3076 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3077 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3078 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3079 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3080 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3081 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3082 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3083 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3084 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3085 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3086 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3087 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3088 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3089 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3090 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3091 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3092 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3093 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3094 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3095 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3096 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3097 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3098 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3099 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3100 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3103 Version 1.26.2 (2018-06-05)
3104 ==========================
3109 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3111 [51117]: https://github.com/rust-lang/rust/issues/51117
3114 Version 1.26.1 (2018-05-29)
3115 ==========================
3120 - [RLS now works on Windows.][50646]
3121 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3127 - [`fn main() -> impl Trait` no longer works for non-Termination
3129 This reverts an accidental stabilization.
3130 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3131 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3133 [50646]: https://github.com/rust-lang/rust/issues/50646
3134 [50656]: https://github.com/rust-lang/rust/pull/50656
3135 [50812]: https://github.com/rust-lang/rust/pull/50812
3136 [50950]: https://github.com/rust-lang/rust/issues/50950
3137 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3139 Version 1.26.0 (2018-05-10)
3140 ==========================
3144 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3145 implement either or both traits.][49299]
3146 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3147 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3148 lifetime can be elided.][49458]
3149 - [`impl Trait` is now stable allowing you to have abstract types in returns
3150 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3151 `fn open(path: impl AsRef<Path>)`.
3152 - [Pattern matching will now automatically apply dereferences.][49394]
3153 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3154 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3155 - [A lot of operations are now available in a const context.][46882] E.g. You
3156 can now index into constant arrays, reference and dereference into constants,
3157 and use tuple struct constructors.
3158 - [Fixed entry slice patterns are now stable.][48516] E.g.
3160 let points = [1, 2, 3, 4];
3162 [1, 2, 3, 4] => println!("All points were sequential."),
3163 _ => println!("Not all points were sequential."),
3170 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3171 - [Fixed exponential projection complexity on nested types.][48296]
3172 This can provide up to a ~12% reduction in compile times for certain crates.
3173 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3174 to remap path prefixes outputted by the compiler.
3175 - [Added `powerpc-unknown-netbsd` target.][48281]
3179 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3180 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3181 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3182 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3183 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3184 - [`ascii::escape_default` is now available in libcore.][48735]
3185 - [Trailing commas are now supported in std and core macros.][48056]
3186 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3187 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3192 - [`*const T::copy_to_nonoverlapping`]
3193 - [`*const T::copy_to`]
3194 - [`*const T::read_unaligned`]
3195 - [`*const T::read_volatile`]
3196 - [`*const T::read`]
3198 - [`*const T::wrapping_add`]
3199 - [`*const T::wrapping_sub`]
3201 - [`*mut T::copy_to_nonoverlapping`]
3202 - [`*mut T::copy_to`]
3203 - [`*mut T::read_unaligned`]
3204 - [`*mut T::read_volatile`]
3206 - [`*mut T::replace`]
3209 - [`*mut T::wrapping_add`]
3210 - [`*mut T::wrapping_sub`]
3211 - [`*mut T::write_bytes`]
3212 - [`*mut T::write_unaligned`]
3213 - [`*mut T::write_volatile`]
3216 - [`FromUtf8Error::as_bytes`]
3217 - [`LocalKey::try_with`]
3218 - [`Option::cloned`]
3219 - [`btree_map::Entry::and_modify`]
3220 - [`fs::read_to_string`]
3223 - [`hash_map::Entry::and_modify`]
3224 - [`iter::FusedIterator`]
3225 - [`ops::RangeInclusive`]
3226 - [`ops::RangeToInclusive`]
3228 - [`slice::rotate_left`]
3229 - [`slice::rotate_right`]
3230 - [`String::retain`]
3235 - [Cargo will now output path to custom commands when `-v` is
3236 passed with `--list`][cargo/5041]
3237 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3241 - [The second edition of "The Rust Programming Language" book is now recommended
3242 over the first.][48404]
3247 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3248 syntax is now invalid.
3250 use std::ops::Fn as dyn;
3251 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3253 - [The result of dereferences are no longer promoted to `'static`.][47408]
3257 const PAIR: &(i32, i32) = &(0, 1);
3258 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3261 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3262 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3264 - [Removed hoedown from rustdoc.][48274]
3265 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3267 [46882]: https://github.com/rust-lang/rust/pull/46882
3268 [47379]: https://github.com/rust-lang/rust/pull/47379
3269 [47408]: https://github.com/rust-lang/rust/pull/47408
3270 [47813]: https://github.com/rust-lang/rust/pull/47813
3271 [48056]: https://github.com/rust-lang/rust/pull/48056
3272 [48125]: https://github.com/rust-lang/rust/pull/48125
3273 [48166]: https://github.com/rust-lang/rust/pull/48166
3274 [48235]: https://github.com/rust-lang/rust/pull/48235
3275 [48274]: https://github.com/rust-lang/rust/pull/48274
3276 [48281]: https://github.com/rust-lang/rust/pull/48281
3277 [48296]: https://github.com/rust-lang/rust/pull/48296
3278 [48326]: https://github.com/rust-lang/rust/pull/48326
3279 [48359]: https://github.com/rust-lang/rust/pull/48359
3280 [48404]: https://github.com/rust-lang/rust/pull/48404
3281 [48481]: https://github.com/rust-lang/rust/pull/48481
3282 [48516]: https://github.com/rust-lang/rust/pull/48516
3283 [48628]: https://github.com/rust-lang/rust/pull/48628
3284 [48629]: https://github.com/rust-lang/rust/pull/48629
3285 [48657]: https://github.com/rust-lang/rust/pull/48657
3286 [48735]: https://github.com/rust-lang/rust/pull/48735
3287 [48978]: https://github.com/rust-lang/rust/pull/48978
3288 [49101]: https://github.com/rust-lang/rust/pull/49101
3289 [49109]: https://github.com/rust-lang/rust/pull/49109
3290 [49121]: https://github.com/rust-lang/rust/pull/49121
3291 [49162]: https://github.com/rust-lang/rust/pull/49162
3292 [49184]: https://github.com/rust-lang/rust/pull/49184
3293 [49234]: https://github.com/rust-lang/rust/pull/49234
3294 [49255]: https://github.com/rust-lang/rust/pull/49255
3295 [49299]: https://github.com/rust-lang/rust/pull/49299
3296 [49305]: https://github.com/rust-lang/rust/pull/49305
3297 [49394]: https://github.com/rust-lang/rust/pull/49394
3298 [49458]: https://github.com/rust-lang/rust/pull/49458
3299 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3300 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3301 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3302 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3303 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3304 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3305 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3306 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3307 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3308 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3309 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3310 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3311 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3312 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3313 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3314 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3315 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3316 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3317 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3318 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3319 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3320 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3321 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3322 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3323 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3324 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3325 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3326 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3327 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3328 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3329 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3330 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3331 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3332 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3333 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3334 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3335 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3336 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3337 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3338 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3339 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3340 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3343 Version 1.25.0 (2018-03-29)
3344 ==========================
3348 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3349 - [You can now use nested groups of imports.][47948]
3350 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3351 - [You can now have `|` at the start of a match arm.][47947] e.g.
3353 enum Foo { A, B, C }
3359 | Foo::B => println!("AB"),
3360 | Foo::C => println!("C"),
3367 - [Upgraded to LLVM 6.][47828]
3368 - [Added `-C lto=val` option.][47521]
3369 - [Added `i586-unknown-linux-musl` target][47282]
3373 - [Impl Send for `process::Command` on Unix.][47760]
3374 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3375 - [`UnsafeCell::into_inner` is now safe.][47204]
3376 - [Implement libstd for CloudABI.][47268]
3377 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3378 - [Implement `AsRef<Path>` for Component][46985]
3379 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3380 - [Moved `Duration` to libcore.][46666]
3384 - [`Location::column`]
3387 The following functions can now be used in a constant expression.
3388 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3389 - [`Duration::new`][47300]
3390 - [`Duration::from_secs`][47300]
3391 - [`Duration::from_millis`][47300]
3395 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3396 - [`cargo new` now defaults to creating a binary crate, instead of a
3397 library crate.][cargo/5029]
3401 - [Rust by example is now shipped with new releases][46196]
3405 - [Deprecated `net::lookup_host`.][47510]
3406 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3407 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3408 around indexing operations (see [#47349][47349]). This has been fixed (which also
3409 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3410 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3412 [33903]: https://github.com/rust-lang/rust/pull/33903
3413 [47947]: https://github.com/rust-lang/rust/pull/47947
3414 [47948]: https://github.com/rust-lang/rust/pull/47948
3415 [47760]: https://github.com/rust-lang/rust/pull/47760
3416 [47790]: https://github.com/rust-lang/rust/pull/47790
3417 [47828]: https://github.com/rust-lang/rust/pull/47828
3418 [47398]: https://github.com/rust-lang/rust/pull/47398
3419 [47510]: https://github.com/rust-lang/rust/pull/47510
3420 [47521]: https://github.com/rust-lang/rust/pull/47521
3421 [47204]: https://github.com/rust-lang/rust/pull/47204
3422 [47251]: https://github.com/rust-lang/rust/pull/47251
3423 [47268]: https://github.com/rust-lang/rust/pull/47268
3424 [47282]: https://github.com/rust-lang/rust/pull/47282
3425 [47300]: https://github.com/rust-lang/rust/pull/47300
3426 [47349]: https://github.com/rust-lang/rust/pull/47349
3427 [46931]: https://github.com/rust-lang/rust/pull/46931
3428 [46985]: https://github.com/rust-lang/rust/pull/46985
3429 [47006]: https://github.com/rust-lang/rust/pull/47006
3430 [46830]: https://github.com/rust-lang/rust/pull/46830
3431 [46095]: https://github.com/rust-lang/rust/pull/46095
3432 [46666]: https://github.com/rust-lang/rust/pull/46666
3433 [46196]: https://github.com/rust-lang/rust/pull/46196
3434 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3435 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3436 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3437 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3438 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3441 Version 1.24.1 (2018-03-01)
3442 ==========================
3444 - [Do not abort when unwinding through FFI][48251]
3445 - [Emit UTF-16 files for linker arguments on Windows][48318]
3446 - [Make the error index generator work again][48308]
3447 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3449 [48251]: https://github.com/rust-lang/rust/issues/48251
3450 [48308]: https://github.com/rust-lang/rust/issues/48308
3451 [48318]: https://github.com/rust-lang/rust/issues/48318
3452 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3455 Version 1.24.0 (2018-02-15)
3456 ==========================
3460 - [External `sysv64` ffi is now available.][46528]
3461 eg. `extern "sysv64" fn foo () {}`
3465 - [rustc now uses 16 codegen units by default for release builds.][46910]
3466 For the fastest builds, utilize `codegen-units=1`.
3467 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3468 - [Add `aarch64-unknown-openbsd` support][46760]
3472 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3473 improvement in performance in the majority of cases.
3474 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3475 with Windows.][46798]
3476 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3477 - [impl `From<bool>` for `AtomicBool`][46293]
3478 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3479 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3480 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3481 - [float::from_bits now just uses transmute.][46012] This provides
3482 some optimisations from LLVM.
3483 - [Copied `AsciiExt` methods onto `char`][46077]
3484 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3485 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3486 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3487 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3491 - [`RefCell::replace`]
3493 - [`atomic::spin_loop_hint`]
3495 The following functions can now be used in a constant expression.
3496 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3498 - [`AtomicBool::new`][46287]
3499 - [`AtomicUsize::new`][46287]
3500 - [`AtomicIsize::new`][46287]
3501 - [`AtomicPtr::new`][46287]
3502 - [`Cell::new`][46287]
3503 - [`{integer}::min_value`][46287]
3504 - [`{integer}::max_value`][46287]
3505 - [`mem::size_of`][46287]
3506 - [`mem::align_of`][46287]
3507 - [`ptr::null`][46287]
3508 - [`ptr::null_mut`][46287]
3509 - [`RefCell::new`][46287]
3510 - [`UnsafeCell::new`][46287]
3514 - [Added a `workspace.default-members` config that
3515 overrides implied `--all` in virtual workspaces.][cargo/4743]
3516 - [Enable incremental by default on development builds.][cargo/4817] Also added
3517 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3518 per-project or global basis respectively.
3525 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3526 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3527 in accordance with IETF RFC 4291 §2.2.
3528 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3529 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3530 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3531 - [Leading zeros in tuple struct members is now an error][47084]
3532 - [`column!()` macro is one-based instead of zero-based][46977]
3533 - [`fmt::Arguments` can no longer be shared across threads][45198]
3534 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3535 - [Cargo sets a different working directory for the compiler][cargo/4788]
3537 [44884]: https://github.com/rust-lang/rust/pull/44884
3538 [45198]: https://github.com/rust-lang/rust/pull/45198
3539 [45506]: https://github.com/rust-lang/rust/pull/45506
3540 [45904]: https://github.com/rust-lang/rust/pull/45904
3541 [45990]: https://github.com/rust-lang/rust/pull/45990
3542 [46012]: https://github.com/rust-lang/rust/pull/46012
3543 [46077]: https://github.com/rust-lang/rust/pull/46077
3544 [46094]: https://github.com/rust-lang/rust/pull/46094
3545 [46284]: https://github.com/rust-lang/rust/pull/46284
3546 [46287]: https://github.com/rust-lang/rust/pull/46287
3547 [46293]: https://github.com/rust-lang/rust/pull/46293
3548 [46528]: https://github.com/rust-lang/rust/pull/46528
3549 [46671]: https://github.com/rust-lang/rust/pull/46671
3550 [46713]: https://github.com/rust-lang/rust/pull/46713
3551 [46735]: https://github.com/rust-lang/rust/pull/46735
3552 [46749]: https://github.com/rust-lang/rust/pull/46749
3553 [46760]: https://github.com/rust-lang/rust/pull/46760
3554 [46798]: https://github.com/rust-lang/rust/pull/46798
3555 [46828]: https://github.com/rust-lang/rust/pull/46828
3556 [46831]: https://github.com/rust-lang/rust/pull/46831
3557 [46833]: https://github.com/rust-lang/rust/pull/46833
3558 [46910]: https://github.com/rust-lang/rust/pull/46910
3559 [46977]: https://github.com/rust-lang/rust/pull/46977
3560 [47018]: https://github.com/rust-lang/rust/pull/47018
3561 [47080]: https://github.com/rust-lang/rust/pull/47080
3562 [47084]: https://github.com/rust-lang/rust/pull/47084
3563 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3564 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3565 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3566 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3567 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3568 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3571 Version 1.23.0 (2018-01-04)
3572 ==========================
3576 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3577 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3578 Which should fix some confusing errors in some operations.
3582 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3583 undefined behavior.][45920]
3584 - [rustc now suggests renaming import if names clash.][45660]
3585 - [Display errors/warnings correctly when there are zero-width or
3586 wide characters.][45711]
3587 - [rustc now avoids unnecessary copies of arguments that are
3588 simple bindings][45380] This should improve memory usage on average by 5-10%.
3589 - [Updated musl used to build musl rustc to 1.1.17][45393]
3593 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3594 - [Implement Hash for raw pointers to unsized types][45483]
3595 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3596 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3597 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3598 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3599 and `<*mut T>::as_mut`][44932]
3600 - [Optimized `Thread::{park, unpark}` implementation][45524]
3601 - [Improved `SliceExt::binary_search` performance.][45333]
3602 - [impl `FromIterator<()>` for `()`][45379]
3603 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3611 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3612 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3613 - [Added unit test checking to `cargo check`][cargo/4592]
3614 - [Cargo now lets you install a specific version
3615 using `cargo install --version`][cargo/4637]
3619 - [Releases now ship with the Cargo book documentation.][45692]
3620 - [rustdoc now prints rendering warnings on every run.][45324]
3624 - [Changes have been made to type equality to make it more correct,
3625 in rare cases this could break some code.][45853] [Tracking issue for
3626 further information][45852]
3627 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3628 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3629 Android 9, the minimum supported version is Android 14.
3630 - [Bumped the minimum LLVM to 3.9][45326]
3632 [44042]: https://github.com/rust-lang/rust/pull/44042
3633 [44932]: https://github.com/rust-lang/rust/pull/44932
3634 [45267]: https://github.com/rust-lang/rust/pull/45267
3635 [45324]: https://github.com/rust-lang/rust/pull/45324
3636 [45326]: https://github.com/rust-lang/rust/pull/45326
3637 [45333]: https://github.com/rust-lang/rust/pull/45333
3638 [45379]: https://github.com/rust-lang/rust/pull/45379
3639 [45380]: https://github.com/rust-lang/rust/pull/45380
3640 [45393]: https://github.com/rust-lang/rust/pull/45393
3641 [45435]: https://github.com/rust-lang/rust/pull/45435
3642 [45483]: https://github.com/rust-lang/rust/pull/45483
3643 [45524]: https://github.com/rust-lang/rust/pull/45524
3644 [45571]: https://github.com/rust-lang/rust/pull/45571
3645 [45580]: https://github.com/rust-lang/rust/pull/45580
3646 [45610]: https://github.com/rust-lang/rust/pull/45610
3647 [45660]: https://github.com/rust-lang/rust/pull/45660
3648 [45692]: https://github.com/rust-lang/rust/pull/45692
3649 [45711]: https://github.com/rust-lang/rust/pull/45711
3650 [45772]: https://github.com/rust-lang/rust/pull/45772
3651 [45852]: https://github.com/rust-lang/rust/issues/45852
3652 [45853]: https://github.com/rust-lang/rust/pull/45853
3653 [45887]: https://github.com/rust-lang/rust/pull/45887
3654 [45920]: https://github.com/rust-lang/rust/pull/45920
3655 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3656 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3657 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3660 Version 1.22.1 (2017-11-22)
3661 ==========================
3663 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3665 [46183]: https://github.com/rust-lang/rust/pull/46183
3667 Version 1.22.0 (2017-11-22)
3668 ==========================
3672 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3673 - [Now accepts underscores in unicode escapes][43716]
3674 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3675 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3679 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3680 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3681 This should decrease compile times for debug builds.
3682 - [strict memory alignment now enabled on ARMv6][45094]
3683 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3687 - [Allow atomic operations up to 32 bits
3688 on `armv5te_unknown_linux_gnueabi`][44978]
3689 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3690 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3691 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3692 - [Properly detect overflow in `Instant += Duration`.][44220]
3693 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3694 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3695 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3702 - [Cargo will now build multi file examples in subdirectories of the `examples`
3703 folder that have a `main.rs` file.][cargo/4496]
3704 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3705 the old format will continue to work and can be updated with `cargo update`.
3706 - [Now supports vendoring git repositories][cargo/3992]
3710 - [`libbacktrace` is now available on Apple platforms.][44251]
3711 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3712 This now lets you specify that a given code example will fail to compile.
3716 - [The minimum Android version that rustc can build for has been bumped
3717 to `4.0` from `2.3`][45656]
3718 - [Allowing `T op= &T` for numeric types has broken some type
3719 inference cases][45480]
3722 [42526]: https://github.com/rust-lang/rust/pull/42526
3723 [43017]: https://github.com/rust-lang/rust/pull/43017
3724 [43716]: https://github.com/rust-lang/rust/pull/43716
3725 [43949]: https://github.com/rust-lang/rust/pull/43949
3726 [44015]: https://github.com/rust-lang/rust/pull/44015
3727 [44220]: https://github.com/rust-lang/rust/pull/44220
3728 [44251]: https://github.com/rust-lang/rust/pull/44251
3729 [44287]: https://github.com/rust-lang/rust/pull/44287
3730 [44303]: https://github.com/rust-lang/rust/pull/44303
3731 [44456]: https://github.com/rust-lang/rust/pull/44456
3732 [44466]: https://github.com/rust-lang/rust/pull/44466
3733 [44895]: https://github.com/rust-lang/rust/pull/44895
3734 [44966]: https://github.com/rust-lang/rust/pull/44966
3735 [44978]: https://github.com/rust-lang/rust/pull/44978
3736 [45041]: https://github.com/rust-lang/rust/pull/45041
3737 [45064]: https://github.com/rust-lang/rust/pull/45064
3738 [45075]: https://github.com/rust-lang/rust/pull/45075
3739 [45094]: https://github.com/rust-lang/rust/pull/45094
3740 [45095]: https://github.com/rust-lang/rust/pull/45095
3741 [45480]: https://github.com/rust-lang/rust/issues/45480
3742 [45656]: https://github.com/rust-lang/rust/pull/45656
3743 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3744 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3745 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3752 Version 1.21.0 (2017-10-12)
3753 ==========================
3757 - [You can now use static references for literals.][43838]
3761 let x: &'static u32 = &0;
3764 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3767 my_macro!(Vec<i32>::new); // Always worked
3768 my_macro!(Vec::<i32>::new); // Now works
3773 - [Upgraded jemalloc to 4.5.0][43911]
3774 - [Enabled unwinding panics on Redox][43917]
3775 - [Now runs LLVM in parallel during translation phase.][43506]
3776 This should reduce peak memory usage.
3780 - [Generate builtin impls for `Clone` for all arrays and tuples that
3781 are `T: Clone`][43690]
3782 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3783 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3784 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3789 [`std::mem::discriminant`]
3793 - [You can now call `cargo install` with multiple package names][cargo/4216]
3794 - [Cargo commands inside a virtual workspace will now implicitly
3795 pass `--all`][cargo/4335]
3796 - [Added a `[patch]` section to `Cargo.toml` to handle
3797 prepublication dependencies][cargo/4123] [RFC 1969]
3798 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3799 like patterns][cargo/4270]
3800 - [Added the `--all-targets` option][cargo/4400]
3801 - [Using required dependencies as a feature is now deprecated and emits
3802 a warning][cargo/4364]
3807 - [Cargo docs are moving][43916]
3808 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3809 - [The rustdoc book is now available][43863]
3810 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3811 - [Added a preview of RLS has been made available through rustup][44204]
3812 Install with `rustup component add rls-preview`
3813 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3814 Previously only showed `std::os::unix`.
3818 - [Changes in method matching against higher-ranked types][43880] This may cause
3819 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3820 - [rustc's JSON error output's byte position start at top of file.][42973]
3821 Was previously relative to the rustc's internal `CodeMap` struct which
3822 required the unstable library `libsyntax` to correctly use.
3823 - [`unused_results` lint no longer ignores booleans][43728]
3825 [42565]: https://github.com/rust-lang/rust/pull/42565
3826 [42973]: https://github.com/rust-lang/rust/pull/42973
3827 [43348]: https://github.com/rust-lang/rust/pull/43348
3828 [43459]: https://github.com/rust-lang/rust/pull/43459
3829 [43506]: https://github.com/rust-lang/rust/pull/43506
3830 [43540]: https://github.com/rust-lang/rust/pull/43540
3831 [43690]: https://github.com/rust-lang/rust/pull/43690
3832 [43728]: https://github.com/rust-lang/rust/pull/43728
3833 [43838]: https://github.com/rust-lang/rust/pull/43838
3834 [43863]: https://github.com/rust-lang/rust/pull/43863
3835 [43880]: https://github.com/rust-lang/rust/pull/43880
3836 [43911]: https://github.com/rust-lang/rust/pull/43911
3837 [43916]: https://github.com/rust-lang/rust/pull/43916
3838 [43917]: https://github.com/rust-lang/rust/pull/43917
3839 [44204]: https://github.com/rust-lang/rust/pull/44204
3840 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3841 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3842 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3843 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3844 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3845 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3846 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3847 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3848 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3850 Version 1.20.0 (2017-08-31)
3851 ===========================
3855 - [Associated constants are now stabilised.][42809]
3856 - [A lot of macro bugs are now fixed.][42913]
3861 - [Struct fields are now properly coerced to the expected field type.][42807]
3862 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3863 `wasm32-experimental-emscripten` target.
3864 - [Changed some of the error messages to be more helpful.][42033]
3865 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3867 - [rustc now reports the total number of errors on compilation failure][43015]
3868 previously this was only the number of errors in the pass that failed.
3869 - [Expansion in rustc has been sped up 29x.][42533]
3870 - [added `msp430-none-elf` target.][43099]
3871 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3873 - [Fixes backtraces on Redox][43228]
3874 - [rustc now identifies different versions of same crate when absolute paths of
3875 different types match in an error message.][42826]
3881 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3882 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3884 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3885 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3886 - [Impl `Clone` for `DefaultHasher`.][42799]
3887 - [Impl `Sync` for `SyncSender`.][42397]
3888 - [Impl `FromStr` for `char`][42271]
3889 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3891 - [allow messages in the `unimplemented!()` macro.][42155]
3892 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3893 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3894 - [Upgrade to Unicode 10.0.0][42999]
3895 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3896 - [Skip the main thread's manual stack guard on Linux][43072]
3897 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3898 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3900 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3905 - [`CStr::into_c_string`]
3906 - [`CString::as_c_str`]
3907 - [`CString::into_boxed_c_str`]
3908 - [`Chain::get_mut`]
3909 - [`Chain::get_ref`]
3910 - [`Chain::into_inner`]
3911 - [`Option::get_or_insert_with`]
3912 - [`Option::get_or_insert`]
3913 - [`OsStr::into_os_string`]
3914 - [`OsString::into_boxed_os_str`]
3917 - [`Utf8Error::error_len`]
3918 - [`char::EscapeDebug`]
3919 - [`char::escape_debug`]
3920 - [`compile_error!`]
3921 - [`f32::from_bits`]
3923 - [`f64::from_bits`]
3925 - [`mem::ManuallyDrop`]
3926 - [`slice::sort_unstable_by_key`]
3927 - [`slice::sort_unstable_by`]
3928 - [`slice::sort_unstable`]
3929 - [`str::from_boxed_utf8_unchecked`]
3930 - [`str::as_bytes_mut`]
3931 - [`str::as_bytes_mut`]
3932 - [`str::from_utf8_mut`]
3933 - [`str::from_utf8_unchecked_mut`]
3935 - [`str::get_unchecked_mut`]
3936 - [`str::get_unchecked`]
3938 - [`str::into_boxed_bytes`]
3943 - [Cargo API token location moved from `~/.cargo/config` to
3944 `~/.cargo/credentials`.][cargo/3978]
3945 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3946 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3947 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3948 - [You can now specify version of a binary when installed through
3949 `cargo install` using `--vers`.][cargo/4229]
3950 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3951 failure.][cargo/4248]
3952 - [Changed the convention around which file is the crate root.][cargo/4259]
3953 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3954 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3959 - [Functions with `'static` in their return types will now not be as usable as
3960 if they were using lifetime parameters instead.][42417]
3961 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3962 takes the sign of NaN into account where previously didn't.][42430]
3964 [42033]: https://github.com/rust-lang/rust/pull/42033
3965 [42155]: https://github.com/rust-lang/rust/pull/42155
3966 [42271]: https://github.com/rust-lang/rust/pull/42271
3967 [42397]: https://github.com/rust-lang/rust/pull/42397
3968 [42417]: https://github.com/rust-lang/rust/pull/42417
3969 [42430]: https://github.com/rust-lang/rust/pull/42430
3970 [42431]: https://github.com/rust-lang/rust/pull/42431
3971 [42533]: https://github.com/rust-lang/rust/pull/42533
3972 [42571]: https://github.com/rust-lang/rust/pull/42571
3973 [42613]: https://github.com/rust-lang/rust/pull/42613
3974 [42799]: https://github.com/rust-lang/rust/pull/42799
3975 [42807]: https://github.com/rust-lang/rust/pull/42807
3976 [42809]: https://github.com/rust-lang/rust/pull/42809
3977 [42822]: https://github.com/rust-lang/rust/pull/42822
3978 [42826]: https://github.com/rust-lang/rust/pull/42826
3979 [42854]: https://github.com/rust-lang/rust/pull/42854
3980 [42913]: https://github.com/rust-lang/rust/pull/42913
3981 [42999]: https://github.com/rust-lang/rust/pull/42999
3982 [43011]: https://github.com/rust-lang/rust/pull/43011
3983 [43015]: https://github.com/rust-lang/rust/pull/43015
3984 [43072]: https://github.com/rust-lang/rust/pull/43072
3985 [43077]: https://github.com/rust-lang/rust/pull/43077
3986 [43097]: https://github.com/rust-lang/rust/pull/43097
3987 [43099]: https://github.com/rust-lang/rust/pull/43099
3988 [43170]: https://github.com/rust-lang/rust/pull/43170
3989 [43178]: https://github.com/rust-lang/rust/pull/43178
3990 [43185]: https://github.com/rust-lang/rust/pull/43185
3991 [43228]: https://github.com/rust-lang/rust/pull/43228
3992 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3993 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3994 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3995 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3996 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3997 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3998 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3999 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
4000 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
4001 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
4002 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
4003 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4004 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4005 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4006 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4007 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4008 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4009 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4010 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4011 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4012 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4013 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4014 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4015 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4016 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4017 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4018 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4019 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4020 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4021 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4022 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4023 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4024 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4025 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4026 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4027 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4028 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4029 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4030 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4033 Version 1.19.0 (2017-07-20)
4034 ===========================
4039 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4040 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4041 - [Macro recursion limit increased to 1024 from 64.][41676]
4042 - [Added lint for detecting unused macros.][41907]
4043 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4044 For example: `let x = loop { break 7; };`
4045 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4046 contain `Copy` types and cannot have a `Drop` implementation.
4047 Example: `union Foo { bar: u8, baz: usize }`
4048 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4049 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4054 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4055 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4056 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4057 you should use `--target armv7-linux-androideabi`.
4058 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4059 - [Minor optimisation of string operations.][42037]
4060 - [Compiler error message is now `aborting due to previous error(s)` instead of
4061 `aborting due to N previous errors`][42150] This was previously inaccurate and
4062 would only count certain kinds of errors.
4063 - [The compiler now supports Visual Studio 2017][42225]
4064 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4065 - [Added a lot][42264] of [new error codes][42302]
4066 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4067 libraries with C Run-time Libraries(CRT) to be statically linked.
4068 - [Fixed various ARM codegen bugs][42740]
4073 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4074 `Extend<Cow<'a, str>>`][41449]
4075 - [`Vec` now implements `From<&mut [T]>`][41530]
4076 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4077 - [`SplitWhitespace` now implements `Clone`][41659]
4078 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4080 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4081 macros, but for printing to stderr.
4086 - [`OsString::shrink_to_fit`]
4089 - [`thread::ThreadId`]
4094 - [Build scripts can now add environment variables to the environment
4095 the crate is being compiled in.
4096 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4097 - [Subcommands now replace the current process rather than spawning a new
4098 child process][cargo/3970]
4099 - [Workspace members can now accept glob file patterns][cargo/3979]
4100 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4101 the members in a given workspace.][cargo/3988]
4102 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4103 - [Target directory path is now in the cargo metadata][cargo/4022]
4104 - [Cargo no longer checks out a local working directory for the
4105 crates.io index][cargo/4026] This should provide smaller file size for the
4106 registry, and improve cloning times, especially on Windows machines.
4107 - [Added an `--exclude` option for excluding certain packages when using the
4108 `--all` option][cargo/4031]
4109 - [Cargo will now automatically retry when receiving a 5xx error
4110 from crates.io][cargo/4032]
4111 - [The `--features` option now accepts multiple comma or space
4112 delimited values.][cargo/4084]
4113 - [Added support for custom target specific runners][cargo/3954]
4118 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4120 - [Rust will now release XZ compressed packages][rust-installer/57]
4121 - [rustup will now prefer to download rust packages with
4122 XZ compression][rustup/1100] over GZip packages.
4123 - [Added the ability to escape `#` in rust documentation][41785] By adding
4124 additional `#`'s ie. `##` is now `#`
4129 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4130 - [`-Z` flags are now no longer allowed to be used on the stable
4131 compiler.][41751] This has been a warning for a year previous to this.
4132 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4133 longer works][42844]. Users should migrate to the built-in `check`
4134 command, which has been available since 1.16.
4135 - [Ending a float literal with `._` is now a hard error.
4136 Example: `42._` .][41946]
4137 - [Any use of a private `extern crate` outside of its module is now a
4138 hard error.][36886] This was previously a warning.
4139 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4140 relative while the `::` prefix makes a path absolute, but was ignored and the
4141 path was relative regardless.
4142 - [Floating point constants in match patterns is now a hard error][36890]
4143 This was previously a warning.
4144 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4145 match patterns is now a hard error][36891] This was previously a warning.
4146 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4148 - [From the pound escape, lines consisting of multiple `#`s are
4150 - [It is an error to re-export private enum variants][42460]. This is
4151 known to break a number of crates that depend on an older version of
4153 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4154 to use it to find the linker, and the build will fail where it did
4155 not previously][42607]
4157 [36886]: https://github.com/rust-lang/rust/issues/36886
4158 [36888]: https://github.com/rust-lang/rust/issues/36888
4159 [36890]: https://github.com/rust-lang/rust/issues/36890
4160 [36891]: https://github.com/rust-lang/rust/issues/36891
4161 [36892]: https://github.com/rust-lang/rust/issues/36892
4162 [37406]: https://github.com/rust-lang/rust/issues/37406
4163 [39983]: https://github.com/rust-lang/rust/pull/39983
4164 [41145]: https://github.com/rust-lang/rust/pull/41145
4165 [41192]: https://github.com/rust-lang/rust/pull/41192
4166 [41258]: https://github.com/rust-lang/rust/pull/41258
4167 [41370]: https://github.com/rust-lang/rust/pull/41370
4168 [41449]: https://github.com/rust-lang/rust/pull/41449
4169 [41530]: https://github.com/rust-lang/rust/pull/41530
4170 [41624]: https://github.com/rust-lang/rust/pull/41624
4171 [41656]: https://github.com/rust-lang/rust/pull/41656
4172 [41659]: https://github.com/rust-lang/rust/pull/41659
4173 [41676]: https://github.com/rust-lang/rust/pull/41676
4174 [41751]: https://github.com/rust-lang/rust/pull/41751
4175 [41764]: https://github.com/rust-lang/rust/pull/41764
4176 [41785]: https://github.com/rust-lang/rust/pull/41785
4177 [41873]: https://github.com/rust-lang/rust/pull/41873
4178 [41907]: https://github.com/rust-lang/rust/pull/41907
4179 [41946]: https://github.com/rust-lang/rust/pull/41946
4180 [42016]: https://github.com/rust-lang/rust/pull/42016
4181 [42037]: https://github.com/rust-lang/rust/pull/42037
4182 [42068]: https://github.com/rust-lang/rust/pull/42068
4183 [42150]: https://github.com/rust-lang/rust/pull/42150
4184 [42162]: https://github.com/rust-lang/rust/pull/42162
4185 [42225]: https://github.com/rust-lang/rust/pull/42225
4186 [42264]: https://github.com/rust-lang/rust/pull/42264
4187 [42302]: https://github.com/rust-lang/rust/pull/42302
4188 [42460]: https://github.com/rust-lang/rust/issues/42460
4189 [42607]: https://github.com/rust-lang/rust/issues/42607
4190 [42740]: https://github.com/rust-lang/rust/pull/42740
4191 [42844]: https://github.com/rust-lang/rust/issues/42844
4192 [42948]: https://github.com/rust-lang/rust/pull/42948
4193 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4194 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4195 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4196 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4197 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4198 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4199 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4200 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4201 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4202 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4203 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4204 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4205 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4206 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4207 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4208 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4209 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4210 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4211 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4212 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4213 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4214 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4217 Version 1.18.0 (2017-06-08)
4218 ===========================
4223 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4224 make the item visible to just that module tree. Also accepts the keyword
4225 `crate` to make something public to the whole crate but not users of the
4226 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4227 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4228 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4229 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4230 types like `Write + Send`, trailing `+` are now supported in trait objects,
4231 and better error reporting for trait objects starting with `?Sized`.
4232 - [0e+10 is now a valid floating point literal][40589]
4233 - [Now warns if you bind a lifetime parameter to 'static][40734]
4234 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4235 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4236 representation in some cases.][40377]
4241 - [rustc can now emit mir with `--emit mir`][39891]
4242 - [Improved LLVM IR for trivial functions][40367]
4243 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4244 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4245 opportunities found through profiling
4246 - [Improved backtrace formatting when panicking][38165]
4251 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4252 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4253 iteration or reallocation.
4254 - [Simplified HashMap Bucket interface][40561] provides performance
4255 improvements for iterating and cloning.
4256 - [Specialize Vec::from_elem to use calloc][40409]
4257 - [Fixed Race condition in fs::create_dir_all][39799]
4258 - [No longer caching stdio on Windows][40516]
4259 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4260 2.50%~ faster and in one case now 12.50% faster.
4261 - [Optimized `AtomicBool::fetch_nand`][41143]
4266 - [`Child::try_wait`]
4267 - [`HashMap::retain`]
4268 - [`HashSet::retain`]
4270 - [`TcpStream::peek`]
4271 - [`UdpSocket::peek`]
4272 - [`UdpSocket::peek_from`]
4277 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4278 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4279 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4280 - [Added Android build support][cargo/3885]
4281 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4282 of a certain type, for example `cargo build --bins` will build all
4284 - [Added support for haiku][cargo/3952]
4289 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4290 - [Added rust-windbg script for better debugging on Windows][39983]
4291 - [Rust now uses the official cross compiler for NetBSD][40612]
4292 - [rustdoc now accepts `#` at the start of files][40828]
4293 - [Fixed jemalloc support for musl][41168]
4298 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4299 always placed after the sign if it exists and before the digits. With the `#`
4300 flag the zeroes are placed after the prefix and before the digits.
4301 - [Due to the struct field optimisation][40377], using `transmute` on structs
4302 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4303 always been undefined behavior, but is now more likely to break in practice.
4304 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4305 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4306 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4307 - [Overlapping inherent `impl`s are now a hard error][40728]
4308 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4309 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4310 `out.asm` and `out.ll` instead of only one of the filetypes.
4311 - [ calling a function that returns `Self` will no longer work][41805] when
4312 the size of `Self` cannot be statically determined.
4313 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4314 this has caused a few regressions namely:
4316 - Changed the link order of local static/dynamic libraries (respecting the
4317 order on given rather than having the compiler reorder).
4318 - Changed how MinGW is linked, native code linked to dynamic libraries
4319 may require manually linking to the gcc support library (for the native
4322 [38165]: https://github.com/rust-lang/rust/pull/38165
4323 [39799]: https://github.com/rust-lang/rust/pull/39799
4324 [39891]: https://github.com/rust-lang/rust/pull/39891
4325 [39983]: https://github.com/rust-lang/rust/pull/39983
4326 [40043]: https://github.com/rust-lang/rust/pull/40043
4327 [40241]: https://github.com/rust-lang/rust/pull/40241
4328 [40338]: https://github.com/rust-lang/rust/pull/40338
4329 [40367]: https://github.com/rust-lang/rust/pull/40367
4330 [40377]: https://github.com/rust-lang/rust/pull/40377
4331 [40409]: https://github.com/rust-lang/rust/pull/40409
4332 [40516]: https://github.com/rust-lang/rust/pull/40516
4333 [40556]: https://github.com/rust-lang/rust/pull/40556
4334 [40561]: https://github.com/rust-lang/rust/pull/40561
4335 [40589]: https://github.com/rust-lang/rust/pull/40589
4336 [40612]: https://github.com/rust-lang/rust/pull/40612
4337 [40723]: https://github.com/rust-lang/rust/pull/40723
4338 [40728]: https://github.com/rust-lang/rust/pull/40728
4339 [40731]: https://github.com/rust-lang/rust/pull/40731
4340 [40734]: https://github.com/rust-lang/rust/pull/40734
4341 [40805]: https://github.com/rust-lang/rust/pull/40805
4342 [40807]: https://github.com/rust-lang/rust/pull/40807
4343 [40828]: https://github.com/rust-lang/rust/pull/40828
4344 [40870]: https://github.com/rust-lang/rust/pull/40870
4345 [41085]: https://github.com/rust-lang/rust/pull/41085
4346 [41143]: https://github.com/rust-lang/rust/pull/41143
4347 [41168]: https://github.com/rust-lang/rust/pull/41168
4348 [41270]: https://github.com/rust-lang/rust/issues/41270
4349 [41469]: https://github.com/rust-lang/rust/pull/41469
4350 [41805]: https://github.com/rust-lang/rust/issues/41805
4351 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4352 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4353 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4354 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4355 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4356 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4357 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4358 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4359 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4360 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4361 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4362 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4363 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4364 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4367 Version 1.17.0 (2017-04-27)
4368 ===========================
4373 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4374 * [Fields of structs may be initialized without duplicating the field/variable
4375 names][39761]. [RFC 1682]
4376 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4377 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4378 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4379 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4380 `'b`. Soundness fix.
4381 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4382 * [Static variables may contain references to other statics][40027]
4387 * [Exit quickly on only `--emit dep-info`][40336]
4388 * [Make `-C relocation-model` more correctly determine whether the linker
4389 creates a position-independent executable][40245]
4390 * [Add `-C overflow-checks` to directly control whether integer overflow
4392 * [The rustc type checker now checks items on demand instead of in a single
4393 in-order pass][40008]. This is mostly an internal refactoring in support of
4394 future work, including incremental type checking, but also resolves [RFC
4395 1647], allowing `Self` to appear in `impl` `where` clauses.
4396 * [Optimize vtable loads][39995]
4397 * [Turn off vectorization for Emscripten targets][39990]
4398 * [Provide suggestions for unknown macros imported with `use`][39953]
4399 * [Fix ICEs in path resolution][39939]
4400 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4401 * [Add clearer error message using `&str + &str`][39116]
4412 * [`Ordering::then`]
4413 * [`Ordering::then_with`]
4414 * [`BTreeMap::range`]
4415 * [`BTreeMap::range_mut`]
4416 * [`collections::Bound`]
4417 * [`process::abort`]
4418 * [`ptr::read_unaligned`]
4419 * [`ptr::write_unaligned`]
4420 * [`Result::expect_err`]
4423 * [`Cell::into_inner`]
4429 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4430 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4431 * [`String` implements `FromIterator<&char>`][40028]
4432 * `Box` [implements][40009] a number of new conversions:
4433 `From<Box<str>> for String`,
4434 `From<Box<[T]>> for Vec<T>`,
4435 `From<Box<CStr>> for CString`,
4436 `From<Box<OsStr>> for OsString`,
4437 `From<Box<Path>> for PathBuf`,
4438 `Into<Box<str>> for String`,
4439 `Into<Box<[T]>> for Vec<T>`,
4440 `Into<Box<CStr>> for CString`,
4441 `Into<Box<OsStr>> for OsString`,
4442 `Into<Box<Path>> for PathBuf`,
4443 `Default for Box<str>`,
4444 `Default for Box<CStr>`,
4445 `Default for Box<OsStr>`,
4446 `From<&CStr> for Box<CStr>`,
4447 `From<&OsStr> for Box<OsStr>`,
4448 `From<&Path> for Box<Path>`
4449 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4450 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4451 * [Slightly optimize `slice::sort`][39538]
4452 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4453 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4454 `Box<str>` implements `From<&str>`][39438]
4455 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4456 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4457 * [`format!` estimates the needed capacity before writing a string][39356]
4458 * [Support unprivileged symlink creation in Windows][38921]
4459 * [`PathBuf` implements `Default`][38764]
4460 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4461 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4462 and poor hash functions.
4467 * [Add `cargo check --all`][cargo/3731]
4468 * [Add an option to ignore SSL revocation checking][cargo/3699]
4469 * [Add `cargo run --package`][cargo/3691]
4470 * [Add `required_features`][cargo/3667]
4471 * [Assume `build.rs` is a build script][cargo/3664]
4472 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4477 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4479 * [The "Unstable Book" documents nightly-only features][ubook]
4480 * [Improve the style of the sidebar in rustdoc output][40265]
4481 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4482 * [Fix MSP430 breakage due to `i128`][40257]
4483 * [Preliminary Solaris/SPARCv9 support][39903]
4484 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4485 run without installing the MSVC runtime.
4486 * [`rustdoc --test` includes file names in test names][39788]
4487 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4488 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4489 * [Initial support for `aarch64-unknown-freebsd`][39491]
4490 * [Initial support for `i686-unknown-netbsd`][39426]
4491 * [This release no longer includes the old makefile build system][39431]. Rust
4492 is built with a custom build system, written in Rust, and with Cargo.
4493 * [Add Debug implementations for libcollection structs][39002]
4494 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4495 * [`--test-threads=0` produces an error][38945]
4496 * [`rustup` installs documentation by default][40526]
4497 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4498 WinDbg and Visual Studio to improve the debugging experience.
4503 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4504 workaround, either use MSVC 2015 or run vcvars.bat.
4505 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4506 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4507 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4509 * [`format!` and `Display::to_string` panic if an underlying formatting
4510 implementation returns an error][40117]. Previously the error was silently
4511 ignored. It is incorrect for `write_fmt` to return an error when writing
4513 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4514 crates were marked stable and could be accessed from the stable toolchain.
4515 * [Rust git source no longer includes vendored crates][39728]. Those that need
4516 to build with vendored crates should build from release tarballs.
4517 * [Fix inert attributes from `proc_macro_derives`][39572]
4518 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4519 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4521 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4522 existing code generally ignores the type of dead-code unless a type-hint is
4523 provided; this can cause surprising inference interactions particularly around
4524 defaulting. The new code uniformly ignores the result type of dead-code.
4525 * [Tuple-struct constructors with private fields are no longer visible][38932]
4526 * [Lifetime parameters that do not appear in the arguments are now considered
4527 early-bound][38897], resolving a soundness bug (#[32330]). The
4528 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4530 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4531 * [Make transmuting from fn item types to pointer-sized types a hard
4534 [27787]: https://github.com/rust-lang/rust/issues/27787
4535 [32330]: https://github.com/rust-lang/rust/issues/32330
4536 [34198]: https://github.com/rust-lang/rust/pull/34198
4537 [38161]: https://github.com/rust-lang/rust/pull/38161
4538 [38368]: https://github.com/rust-lang/rust/pull/38368
4539 [38584]: https://github.com/rust-lang/rust/issues/38584
4540 [38661]: https://github.com/rust-lang/rust/pull/38661
4541 [38764]: https://github.com/rust-lang/rust/pull/38764
4542 [38864]: https://github.com/rust-lang/rust/issues/38864
4543 [38897]: https://github.com/rust-lang/rust/pull/38897
4544 [38921]: https://github.com/rust-lang/rust/pull/38921
4545 [38932]: https://github.com/rust-lang/rust/pull/38932
4546 [38945]: https://github.com/rust-lang/rust/pull/38945
4547 [38981]: https://github.com/rust-lang/rust/pull/38981
4548 [39002]: https://github.com/rust-lang/rust/pull/39002
4549 [39116]: https://github.com/rust-lang/rust/pull/39116
4550 [39193]: https://github.com/rust-lang/rust/pull/39193
4551 [39265]: https://github.com/rust-lang/rust/pull/39265
4552 [39356]: https://github.com/rust-lang/rust/pull/39356
4553 [39372]: https://github.com/rust-lang/rust/pull/39372
4554 [39426]: https://github.com/rust-lang/rust/pull/39426
4555 [39431]: https://github.com/rust-lang/rust/pull/39431
4556 [39438]: https://github.com/rust-lang/rust/pull/39438
4557 [39440]: https://github.com/rust-lang/rust/pull/39440
4558 [39485]: https://github.com/rust-lang/rust/pull/39485
4559 [39491]: https://github.com/rust-lang/rust/pull/39491
4560 [39518]: https://github.com/rust-lang/rust/pull/39518
4561 [39538]: https://github.com/rust-lang/rust/pull/39538
4562 [39572]: https://github.com/rust-lang/rust/pull/39572
4563 [39633]: https://github.com/rust-lang/rust/pull/39633
4564 [39642]: https://github.com/rust-lang/rust/pull/39642
4565 [39728]: https://github.com/rust-lang/rust/pull/39728
4566 [39761]: https://github.com/rust-lang/rust/pull/39761
4567 [39788]: https://github.com/rust-lang/rust/pull/39788
4568 [39793]: https://github.com/rust-lang/rust/pull/39793
4569 [39837]: https://github.com/rust-lang/rust/pull/39837
4570 [39843]: https://github.com/rust-lang/rust/pull/39843
4571 [39851]: https://github.com/rust-lang/rust/pull/39851
4572 [39903]: https://github.com/rust-lang/rust/pull/39903
4573 [39939]: https://github.com/rust-lang/rust/pull/39939
4574 [39953]: https://github.com/rust-lang/rust/pull/39953
4575 [39960]: https://github.com/rust-lang/rust/pull/39960
4576 [39990]: https://github.com/rust-lang/rust/pull/39990
4577 [39995]: https://github.com/rust-lang/rust/pull/39995
4578 [40008]: https://github.com/rust-lang/rust/pull/40008
4579 [40009]: https://github.com/rust-lang/rust/pull/40009
4580 [40027]: https://github.com/rust-lang/rust/pull/40027
4581 [40028]: https://github.com/rust-lang/rust/pull/40028
4582 [40037]: https://github.com/rust-lang/rust/pull/40037
4583 [40117]: https://github.com/rust-lang/rust/pull/40117
4584 [40166]: https://github.com/rust-lang/rust/pull/40166
4585 [40245]: https://github.com/rust-lang/rust/pull/40245
4586 [40257]: https://github.com/rust-lang/rust/pull/40257
4587 [40261]: https://github.com/rust-lang/rust/pull/40261
4588 [40265]: https://github.com/rust-lang/rust/pull/40265
4589 [40319]: https://github.com/rust-lang/rust/pull/40319
4590 [40336]: https://github.com/rust-lang/rust/pull/40336
4591 [40526]: https://github.com/rust-lang/rust/pull/40526
4592 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4593 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4594 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4595 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4596 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4597 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4598 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4599 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4600 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4601 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4602 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4603 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4604 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4605 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4606 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4607 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4608 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4609 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4610 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4611 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4612 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4613 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4614 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4615 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4616 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4617 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4618 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4619 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4620 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4621 [mdbook]: https://crates.io/crates/mdbook
4622 [ubook]: https://doc.rust-lang.org/unstable-book/
4625 Version 1.16.0 (2017-03-16)
4626 ===========================
4631 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4632 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4633 match patterns][38069]
4634 * [Clean up semantics of `self` in an import list][38313]
4635 * [`Self` may appear in `impl` headers][38920]
4636 * [`Self` may appear in struct expressions][39282]
4641 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4642 a `.rmeta` file containing only crate metadata][38571]. This can be
4643 used by tools like the Rust Language Service to perform
4644 metadata-only builds.
4645 * [Levenshtein based typo suggestions now work in most places, while
4646 previously they worked only for fields and sometimes for local
4647 variables][38927]. Together with the overhaul of "no
4648 resolution"/"unexpected resolution" errors (#[38154]) they result in
4649 large and systematic improvement in resolution diagnostics.
4650 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4652 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4653 * [`rustc` no longer attempts to provide "consider using an explicit
4654 lifetime" suggestions][37057]. They were inaccurate.
4659 * [`VecDeque::truncate`]
4660 * [`VecDeque::resize`]
4661 * [`String::insert_str`]
4662 * [`Duration::checked_add`]
4663 * [`Duration::checked_sub`]
4664 * [`Duration::checked_div`]
4665 * [`Duration::checked_mul`]
4668 * [`SocketAddr::is_ipv4`]
4669 * [`SocketAddr::is_ipv6`]
4670 * [`IpAddr::is_ipv4`]
4671 * [`IpAddr::is_ipv6`]
4673 * [`Vec::dedup_by_key`]
4674 * [`Result::unwrap_or_default`]
4675 * [`<*const T>::wrapping_offset`]
4676 * [`<*mut T>::wrapping_offset`]
4677 * `CommandExt::creation_flags`
4678 * [`File::set_permissions`]
4679 * [`String::split_off`]
4684 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4685 their argument by `Borrow` parameter][37761]
4686 * [All public types in std implement `Debug`][38006]
4687 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4688 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4689 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4691 * [std: Fix partial writes in `LineWriter`][38062]
4692 * [std: Clamp max read/write sizes on Unix][38062]
4693 * [Use more specific panic message for `&str` slicing errors][38066]
4694 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4695 functionality cannot be achieved in std currently.
4696 * [`writeln!`, like `println!`, now accepts a form with no string
4697 or formatting arguments, to just print a newline][38469]
4698 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4699 * [Reduce the size of static data in `std_unicode::tables`][38781]
4700 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4701 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4703 * [`Duration` implements `Sum`][38712]
4704 * [`String` implements `ToSocketAddrs`][39048]
4709 * [The `cargo check` command does a type check of a project without
4710 building it][cargo/3296]
4711 * [crates.io will display CI badges from Travis and AppVeyor, if
4712 specified in Cargo.toml][cargo/3546]
4713 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4714 * [Compilation profiles accept integer values for `debug`, in addition
4715 to `true` and `false`. These are passed to `rustc` as the value to
4716 `-C debuginfo`][cargo/3534]
4717 * [Implement `cargo --version --verbose`][cargo/3604]
4718 * [All builds now output 'dep-info' build dependencies compatible with
4719 make and ninja][cargo/3557]
4720 * [Build all workspace members with `build --all`][cargo/3511]
4721 * [Document all workspace members with `doc --all`][cargo/3515]
4722 * [Path deps outside workspace are not members][cargo/3443]
4727 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4728 the path to the Rust implementation][38589]
4729 * [The `armv7-linux-androideabi` target no longer enables NEON
4730 extensions, per Google's ABI guide][38413]
4731 * [The stock standard library can be compiled for Redox OS][38401]
4732 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4734 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4736 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4741 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4742 match patterns][38069]
4743 * In this release, references to uninhabited types can not be
4744 pattern-matched. This was accidentally allowed in 1.15.
4745 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4746 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4748 * [Clean up semantics of `self` in an import list][38313]
4749 * Reimplemented lifetime elision. This change was almost entirely compatible
4750 with existing code, but it did close a number of small bugs and loopholes,
4751 as well as being more accepting in some other [cases][41105].
4753 [37057]: https://github.com/rust-lang/rust/pull/37057
4754 [37761]: https://github.com/rust-lang/rust/pull/37761
4755 [38006]: https://github.com/rust-lang/rust/pull/38006
4756 [38051]: https://github.com/rust-lang/rust/pull/38051
4757 [38062]: https://github.com/rust-lang/rust/pull/38062
4758 [38062]: https://github.com/rust-lang/rust/pull/38622
4759 [38066]: https://github.com/rust-lang/rust/pull/38066
4760 [38069]: https://github.com/rust-lang/rust/pull/38069
4761 [38131]: https://github.com/rust-lang/rust/pull/38131
4762 [38154]: https://github.com/rust-lang/rust/pull/38154
4763 [38274]: https://github.com/rust-lang/rust/pull/38274
4764 [38304]: https://github.com/rust-lang/rust/pull/38304
4765 [38313]: https://github.com/rust-lang/rust/pull/38313
4766 [38314]: https://github.com/rust-lang/rust/pull/38314
4767 [38327]: https://github.com/rust-lang/rust/pull/38327
4768 [38401]: https://github.com/rust-lang/rust/pull/38401
4769 [38413]: https://github.com/rust-lang/rust/pull/38413
4770 [38469]: https://github.com/rust-lang/rust/pull/38469
4771 [38559]: https://github.com/rust-lang/rust/pull/38559
4772 [38571]: https://github.com/rust-lang/rust/pull/38571
4773 [38580]: https://github.com/rust-lang/rust/pull/38580
4774 [38589]: https://github.com/rust-lang/rust/pull/38589
4775 [38670]: https://github.com/rust-lang/rust/pull/38670
4776 [38712]: https://github.com/rust-lang/rust/pull/38712
4777 [38726]: https://github.com/rust-lang/rust/pull/38726
4778 [38781]: https://github.com/rust-lang/rust/pull/38781
4779 [38798]: https://github.com/rust-lang/rust/pull/38798
4780 [38909]: https://github.com/rust-lang/rust/pull/38909
4781 [38920]: https://github.com/rust-lang/rust/pull/38920
4782 [38927]: https://github.com/rust-lang/rust/pull/38927
4783 [39048]: https://github.com/rust-lang/rust/pull/39048
4784 [39282]: https://github.com/rust-lang/rust/pull/39282
4785 [39379]: https://github.com/rust-lang/rust/pull/39379
4786 [41105]: https://github.com/rust-lang/rust/issues/41105
4787 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4788 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4789 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4790 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4791 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4792 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4793 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4794 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4795 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4796 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4797 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4798 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4799 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4800 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4801 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4802 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4803 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4804 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4805 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4806 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4807 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4808 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4809 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4810 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4811 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4812 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4813 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4814 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4815 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4816 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4819 Version 1.15.1 (2017-02-09)
4820 ===========================
4822 * [Fix IntoIter::as_mut_slice's signature][39466]
4823 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4825 [39466]: https://github.com/rust-lang/rust/pull/39466
4826 [39523]: https://github.com/rust-lang/rust/pull/39523
4829 Version 1.15.0 (2017-02-02)
4830 ===========================
4835 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4836 stable. This allows popular code-generating crates like Serde and Diesel to
4837 work ergonomically. [RFC 1681].
4838 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4839 with curly braces][36868]. Part of [RFC 1506].
4840 * [A number of minor changes to name resolution have been activated][37127].
4841 They add up to more consistent semantics, allowing for future evolution of
4842 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4843 details of what is different. The breaking changes here have been transitioned
4844 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4845 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4847 * [`?Sized` can be used in `where` clauses][37791]
4848 * [There is now a limit on the size of monomorphized types and it can be
4849 modified with the `#![type_size_limit]` crate attribute, similarly to
4850 the `#![recursion_limit]` attribute][37789]
4855 * [On Windows, the compiler will apply dllimport attributes when linking to
4856 extern functions][37973]. Additional attributes and flags can control which
4857 library kind is linked and its name. [RFC 1717].
4858 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4859 * [The `--test` flag works with procedural macro crates][38107]
4860 * [Fix `extern "aapcs" fn` ABI][37814]
4861 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4862 * [The `format!` expander recognizes incorrect `printf` and shell-style
4863 formatting directives and suggests the correct format][37613].
4864 * [Only report one error for all unused imports in an import list][37456]
4866 Compiler Performance
4867 --------------------
4869 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4870 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4871 * [Don't clone in `UnificationTable::probe`][37848]
4872 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4873 * [Use small vectors in type walker][37760]
4874 * [Macro expansion performance was improved][37701]
4875 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4876 * [Replace FNV with a faster hash function][37229]
4881 * [`std::iter::Iterator::min_by`]
4882 * [`std::iter::Iterator::max_by`]
4883 * [`std::os::*::fs::FileExt`]
4884 * [`std::sync::atomic::Atomic*::get_mut`]
4885 * [`std::sync::atomic::Atomic*::into_inner`]
4886 * [`std::vec::IntoIter::as_slice`]
4887 * [`std::vec::IntoIter::as_mut_slice`]
4888 * [`std::sync::mpsc::Receiver::try_iter`]
4889 * [`std::os::unix::process::CommandExt::before_exec`]
4890 * [`std::rc::Rc::strong_count`]
4891 * [`std::rc::Rc::weak_count`]
4892 * [`std::sync::Arc::strong_count`]
4893 * [`std::sync::Arc::weak_count`]
4894 * [`std::char::encode_utf8`]
4895 * [`std::char::encode_utf16`]
4896 * [`std::cell::Ref::clone`]
4897 * [`std::io::Take::into_inner`]
4902 * [The standard sorting algorithm has been rewritten for dramatic performance
4903 improvements][38192]. It is a hybrid merge sort, drawing influences from
4904 Timsort. Previously it was a naive merge sort.
4905 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4906 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4908 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4909 and `char_indices().last()`][37882]
4910 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4911 * [Chinese characters display correctly in `fmt::Debug`][37855]
4912 * [Derive `Default` for `Duration`][37699]
4913 * [Support creation of anonymous pipes on WinXP/2k][37677]
4914 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4915 * [Don't pass overlapped handles to processes][38835]
4920 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4921 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4922 should instead check the variable at runtime with `std::env`. That the value
4923 was set at build time was a bug, and incorrect when cross-compiling. This
4924 change is known to cause breakage.
4925 * [Add `--all` flag to `cargo test`][cargo/3221]
4926 * [Compile statically against the MSVC CRT][cargo/3363]
4927 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4928 * [Link OpenSSL statically on OSX][cargo/3311]
4929 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4930 * [Test for bad path overrides with summaries][cargo/3336]
4931 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4932 * [Fix retrying crate downloads for network errors][cargo/3348]
4933 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4934 * [Emit more info on --message-format=json][cargo/3319]
4935 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4936 * [Don't ignore errors in workspace manifest][cargo/3409]
4937 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4942 * [Test runners (binaries built with `--test`) now support a `--list` argument
4943 that lists the tests it contains][38185]
4944 * [Test runners now support a `--exact` argument that makes the test filter
4945 match exactly, instead of matching only a substring of the test name][38181]
4946 * [rustdoc supports a `--playground-url` flag][37763]
4947 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4952 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4953 continue to be used in this release by passing `--disable-rustbuild` to the
4954 configure script, but they will be deleted soon. Note that the new build
4955 system uses a different on-disk layout that will likely affect any scripts
4957 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4959 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4960 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4966 * [A number of minor changes to name resolution have been activated][37127].
4967 They add up to more consistent semantics, allowing for future evolution of
4968 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4969 details of what is different. The breaking changes here have been transitioned
4970 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4971 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4972 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4973 should instead check the variable at runtime with `std::env`. That the value
4974 was set at build time was a bug, and incorrect when cross-compiling. This
4975 change is known to cause breakage.
4976 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4977 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4978 1.10 and is now an error by default. It will become a hard error in the near
4980 * [The semantics relating modules to file system directories are changing in
4981 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4982 lint, which is a warning in this release, and will become a hard error in the
4984 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4985 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4986 the underlying iterator][37834]
4988 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4989 [33685]: https://github.com/rust-lang/rust/issues/33685
4990 [36868]: https://github.com/rust-lang/rust/pull/36868
4991 [37127]: https://github.com/rust-lang/rust/pull/37127
4992 [37229]: https://github.com/rust-lang/rust/pull/37229
4993 [37456]: https://github.com/rust-lang/rust/pull/37456
4994 [37527]: https://github.com/rust-lang/rust/pull/37527
4995 [37602]: https://github.com/rust-lang/rust/pull/37602
4996 [37613]: https://github.com/rust-lang/rust/pull/37613
4997 [37615]: https://github.com/rust-lang/rust/pull/37615
4998 [37636]: https://github.com/rust-lang/rust/pull/37636
4999 [37627]: https://github.com/rust-lang/rust/pull/37627
5000 [37642]: https://github.com/rust-lang/rust/pull/37642
5001 [37677]: https://github.com/rust-lang/rust/pull/37677
5002 [37699]: https://github.com/rust-lang/rust/pull/37699
5003 [37701]: https://github.com/rust-lang/rust/pull/37701
5004 [37705]: https://github.com/rust-lang/rust/pull/37705
5005 [37749]: https://github.com/rust-lang/rust/pull/37749
5006 [37760]: https://github.com/rust-lang/rust/pull/37760
5007 [37763]: https://github.com/rust-lang/rust/pull/37763
5008 [37764]: https://github.com/rust-lang/rust/pull/37764
5009 [37789]: https://github.com/rust-lang/rust/pull/37789
5010 [37791]: https://github.com/rust-lang/rust/pull/37791
5011 [37814]: https://github.com/rust-lang/rust/pull/37814
5012 [37817]: https://github.com/rust-lang/rust/pull/37817
5013 [37834]: https://github.com/rust-lang/rust/pull/37834
5014 [37848]: https://github.com/rust-lang/rust/pull/37848
5015 [37855]: https://github.com/rust-lang/rust/pull/37855
5016 [37882]: https://github.com/rust-lang/rust/pull/37882
5017 [37888]: https://github.com/rust-lang/rust/pull/37888
5018 [37973]: https://github.com/rust-lang/rust/pull/37973
5019 [37979]: https://github.com/rust-lang/rust/pull/37979
5020 [38086]: https://github.com/rust-lang/rust/pull/38086
5021 [38107]: https://github.com/rust-lang/rust/pull/38107
5022 [38117]: https://github.com/rust-lang/rust/pull/38117
5023 [38134]: https://github.com/rust-lang/rust/pull/38134
5024 [38146]: https://github.com/rust-lang/rust/pull/38146
5025 [38181]: https://github.com/rust-lang/rust/pull/38181
5026 [38182]: https://github.com/rust-lang/rust/pull/38182
5027 [38185]: https://github.com/rust-lang/rust/pull/38185
5028 [38192]: https://github.com/rust-lang/rust/pull/38192
5029 [38279]: https://github.com/rust-lang/rust/pull/38279
5030 [38835]: https://github.com/rust-lang/rust/pull/38835
5031 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5032 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5033 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5034 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5035 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5036 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5037 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5038 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5039 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5040 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5041 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5042 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5043 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5044 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5045 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5046 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5047 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5048 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5049 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5050 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5051 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5052 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5053 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5054 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5055 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5056 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5057 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5058 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5059 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5060 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5061 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5062 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5063 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5064 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5065 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5066 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5067 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5068 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5071 Version 1.14.0 (2016-12-22)
5072 ===========================
5077 * [`..` matches multiple tuple fields in enum variants, structs
5078 and tuples][36843]. [RFC 1492].
5079 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5080 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5081 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5082 dereferencing][36822]
5087 * [Mark enums with non-zero discriminant as non-zero][37224]
5088 * [Lower-case `static mut` names are linted like other
5089 statics and consts][37162]
5090 * [Fix ICE on some macros in const integer positions
5091 (e.g. `[u8; m!()]`)][36819]
5092 * [Improve error message and snippet for "did you mean `x`"][36798]
5093 * [Add a panic-strategy field to the target specification][36794]
5094 * [Include LLVM version in `--version --verbose`][37200]
5096 Compile-time Optimizations
5097 --------------------------
5099 * [Improve macro expansion performance][37569]
5100 * [Shrink `Expr_::ExprInlineAsm`][37445]
5101 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5102 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5103 * [Avoid more allocations when compiling html5ever][37373]
5104 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5105 * [Avoid some allocations in the macro parser][37318]
5106 * [Use a faster deflate setting][37298]
5107 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5108 during interning of slices][37270]
5109 * [Optimize `write_metadata`][37267]
5110 * [Don't process obligation forest cycles when stalled][37231]
5111 * [Avoid many `CrateConfig` clones][37161]
5112 * [Optimize `Substs::super_fold_with`][37108]
5113 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5114 * [Speed up `plug_leaks`][36917]
5119 * [`println!()`, with no arguments, prints newline][36825].
5120 Previously, an empty string was required to achieve the same.
5121 * [`Wrapping` impls standard binary and unary operators, as well as
5122 the `Sum` and `Product` iterators][37356]
5123 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5125 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5126 `VecDeque` iterators][37315]
5127 * [Improve `SipHasher` performance on small values][37312]
5128 * [Add Iterator trait TrustedLen to enable better FromIterator /
5130 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5131 * [`ReadDir` implements `Debug`][37221]
5132 * [Implement `RefUnwindSafe` for atomic types][37178]
5133 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5134 * [Avoid allocations in `Decoder::read_str`][37064]
5135 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5136 * [Impl `Debug` for raw pointers to unsized data][36880]
5137 * [Don't reuse `HashMap` random seeds][37470]
5138 * [The internal memory layout of `HashMap` is more cache-friendly, for
5139 significant improvements in some operations][36692]
5140 * [`HashMap` uses less memory on 32-bit architectures][36595]
5141 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5146 * [Expose rustc cfg values to build scripts][cargo/3243]
5147 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5148 * [Fix passing --features when testing multiple packages][cargo/3280]
5149 * [Use a single profile set per workspace][cargo/3249]
5150 * [Load `replace` sections from lock files][cargo/3220]
5151 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5156 * [rustup is the recommended Rust installation method][1.14rustup]
5157 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5158 S390x. These are [tier 2] platforms and may have major defects. Follow the
5159 instructions on the website to install, or add the targets to an existing
5160 installation with `rustup target add`. The new target triples are:
5161 - `mips-unknown-linux-gnu`
5162 - `mipsel-unknown-linux-gnu`
5163 - `mips64-unknown-linux-gnuabi64`
5164 - `mips64el-unknown-linux-gnuabi64 `
5165 - `powerpc-unknown-linux-gnu`
5166 - `powerpc64-unknown-linux-gnu`
5167 - `powerpc64le-unknown-linux-gnu`
5168 - `s390x-unknown-linux-gnu `
5169 * This release includes target (std) builds for ARM Linux running MUSL
5170 libc. These are [tier 2] platforms and may have major defects. Add the
5171 following triples to an existing rustup installation with `rustup target add`:
5172 - `arm-unknown-linux-musleabi`
5173 - `arm-unknown-linux-musleabihf`
5174 - `armv7-unknown-linux-musleabihf`
5175 * This release includes [experimental support for WebAssembly][1.14wasm], via
5176 the `wasm32-unknown-emscripten` target. This target is known to have major
5177 defects. Please test, report, and fix.
5178 * rustup no longer installs documentation by default. Run `rustup
5179 component add rust-docs` to install.
5180 * [Fix line stepping in debugger][37310]
5181 * [Enable line number debuginfo in releases][37280]
5186 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5187 * [Add support for Fuchsia OS][37313]
5188 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5193 * [A number of forward-compatibility lints used by the compiler
5194 to gradually introduce language changes have been converted
5195 to deny by default][36894]:
5196 - ["use of inaccessible extern crate erroneously allowed"][36886]
5197 - ["type parameter default erroneously allowed in invalid location"][36887]
5198 - ["detects super or self keywords at the beginning of global path"][36888]
5199 - ["two overlapping inherent impls define an item with the same name
5200 were erroneously allowed"][36889]
5201 - ["floating-point constants cannot be used in patterns"][36890]
5202 - ["constants of struct or enum type can only be used in a pattern if
5203 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5204 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5205 * [Prohibit patterns in trait methods without bodies][37378]
5206 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5207 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5208 * [The `$crate` macro variable is accepted in fewer locations][37213]
5209 * [Impls specifying extra region requirements beyond the trait
5210 they implement are rejected][37167]
5211 * [Enums may not be unsized][37111]. Unsized enums are intended to
5212 work but never have. For now they are forbidden.
5213 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5215 [tier 2]: https://forge.rust-lang.org/platform-support.html
5216 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5217 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5218 [36430]: https://github.com/rust-lang/rust/pull/36430
5219 [36595]: https://github.com/rust-lang/rust/pull/36595
5220 [36595]: https://github.com/rust-lang/rust/pull/36595
5221 [36692]: https://github.com/rust-lang/rust/pull/36692
5222 [36767]: https://github.com/rust-lang/rust/pull/36767
5223 [36794]: https://github.com/rust-lang/rust/pull/36794
5224 [36798]: https://github.com/rust-lang/rust/pull/36798
5225 [36819]: https://github.com/rust-lang/rust/pull/36819
5226 [36822]: https://github.com/rust-lang/rust/pull/36822
5227 [36825]: https://github.com/rust-lang/rust/pull/36825
5228 [36843]: https://github.com/rust-lang/rust/pull/36843
5229 [36880]: https://github.com/rust-lang/rust/pull/36880
5230 [36886]: https://github.com/rust-lang/rust/issues/36886
5231 [36887]: https://github.com/rust-lang/rust/issues/36887
5232 [36888]: https://github.com/rust-lang/rust/issues/36888
5233 [36889]: https://github.com/rust-lang/rust/issues/36889
5234 [36890]: https://github.com/rust-lang/rust/issues/36890
5235 [36891]: https://github.com/rust-lang/rust/issues/36891
5236 [36892]: https://github.com/rust-lang/rust/issues/36892
5237 [36894]: https://github.com/rust-lang/rust/pull/36894
5238 [36917]: https://github.com/rust-lang/rust/pull/36917
5239 [36993]: https://github.com/rust-lang/rust/pull/36993
5240 [37037]: https://github.com/rust-lang/rust/pull/37037
5241 [37064]: https://github.com/rust-lang/rust/pull/37064
5242 [37094]: https://github.com/rust-lang/rust/pull/37094
5243 [37108]: https://github.com/rust-lang/rust/pull/37108
5244 [37111]: https://github.com/rust-lang/rust/pull/37111
5245 [37161]: https://github.com/rust-lang/rust/pull/37161
5246 [37162]: https://github.com/rust-lang/rust/pull/37162
5247 [37167]: https://github.com/rust-lang/rust/pull/37167
5248 [37178]: https://github.com/rust-lang/rust/pull/37178
5249 [37200]: https://github.com/rust-lang/rust/pull/37200
5250 [37213]: https://github.com/rust-lang/rust/pull/37213
5251 [37221]: https://github.com/rust-lang/rust/pull/37221
5252 [37224]: https://github.com/rust-lang/rust/pull/37224
5253 [37230]: https://github.com/rust-lang/rust/pull/37230
5254 [37231]: https://github.com/rust-lang/rust/pull/37231
5255 [37247]: https://github.com/rust-lang/rust/pull/37247
5256 [37267]: https://github.com/rust-lang/rust/pull/37267
5257 [37270]: https://github.com/rust-lang/rust/pull/37270
5258 [37273]: https://github.com/rust-lang/rust/pull/37273
5259 [37280]: https://github.com/rust-lang/rust/pull/37280
5260 [37298]: https://github.com/rust-lang/rust/pull/37298
5261 [37306]: https://github.com/rust-lang/rust/pull/37306
5262 [37310]: https://github.com/rust-lang/rust/pull/37310
5263 [37312]: https://github.com/rust-lang/rust/pull/37312
5264 [37313]: https://github.com/rust-lang/rust/pull/37313
5265 [37315]: https://github.com/rust-lang/rust/pull/37315
5266 [37318]: https://github.com/rust-lang/rust/pull/37318
5267 [37322]: https://github.com/rust-lang/rust/pull/37322
5268 [37326]: https://github.com/rust-lang/rust/pull/37326
5269 [37351]: https://github.com/rust-lang/rust/pull/37351
5270 [37356]: https://github.com/rust-lang/rust/pull/37356
5271 [37367]: https://github.com/rust-lang/rust/pull/37367
5272 [37373]: https://github.com/rust-lang/rust/pull/37373
5273 [37378]: https://github.com/rust-lang/rust/pull/37378
5274 [37389]: https://github.com/rust-lang/rust/pull/37389
5275 [37392]: https://github.com/rust-lang/rust/pull/37392
5276 [37427]: https://github.com/rust-lang/rust/pull/37427
5277 [37439]: https://github.com/rust-lang/rust/pull/37439
5278 [37445]: https://github.com/rust-lang/rust/pull/37445
5279 [37470]: https://github.com/rust-lang/rust/pull/37470
5280 [37569]: https://github.com/rust-lang/rust/pull/37569
5281 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5282 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5283 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5284 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5285 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5286 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5287 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5290 Version 1.13.0 (2016-11-10)
5291 ===========================
5296 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5297 errors, like the `try!` macro, described in [RFC 0243].
5298 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5299 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5300 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5301 * [Fix lifetime rules for 'if' conditions][36029]
5302 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5307 * [Add the `-C link-arg` argument][36574]
5308 * [Remove the old AST-based backend from rustc_trans][35764]
5309 * [Don't enable NEON by default on armv7 Linux][35814]
5310 * [Fix debug line number info for macro expansions][35238]
5311 * [Do not emit "class method" debuginfo for types that are not
5312 DICompositeType][36008]
5313 * [Warn about multiple conflicting #[repr] hints][34623]
5314 * [When sizing DST, don't double-count nested struct prefixes][36351]
5315 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5316 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5317 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5318 * [Expand macros without recursing to avoid stack overflows][36214]
5323 * [Replace macro backtraces with labeled local uses][35702]
5324 * [Improve error message for misplaced doc comments][33922]
5325 * [Buffer unix and lock windows to prevent message interleaving][35975]
5326 * [Update lifetime errors to specifically note temporaries][36171]
5327 * [Special case a few colors for Windows][36178]
5328 * [Suggest `use self` when such an import resolves][36289]
5329 * [Be more specific when type parameter shadows primitive type][36338]
5330 * Many minor improvements
5332 Compile-time Optimizations
5333 --------------------------
5335 * [Compute and cache HIR hashes at beginning][35854]
5336 * [Don't hash types in loan paths][36004]
5337 * [Cache projections in trans][35761]
5338 * [Optimize the parser's last token handling][36527]
5339 * [Only instantiate #[inline] functions in codegen units referencing
5340 them][36524]. This leads to big improvements in cases where crates export
5341 define many inline functions without using them directly.
5342 * [Lazily allocate TypedArena's first chunk][36592]
5343 * [Don't allocate during default HashSet creation][36734]
5350 * [`overflowing_abs`]
5351 * [`RefCell::try_borrow`]
5352 * [`RefCell::try_borrow_mut`]
5357 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5358 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5360 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5361 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5362 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5363 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5364 * [Use arc4rand on FreeBSD][35884]
5365 * [memrchr: Correct aligned offset computation][35969]
5366 * [Improve Demangling of Rust Symbols][36059]
5367 * [Use monotonic time in condition variables][35048]
5368 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5369 * [Implement conversion traits for `char`][35755]
5370 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5371 * [Zero first byte of CString on drop][36264]
5372 * [Inherit overflow checks for sum and product][36372]
5373 * [Add missing Eq implementations][36423]
5374 * [Implement `Debug` for `DirEntry`][36631]
5375 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5377 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5378 * [Implement more traits for `std::io::ErrorKind`][35911]
5379 * [Optimize BinaryHeap bounds checking][36072]
5380 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5381 `extend_with_element`][36355]
5382 * [Fix overflow checking in unsigned pow()][34942]
5387 * This release includes security fixes to both curl and OpenSSL.
5388 * [Fix transitive doctests when panic=abort][cargo/3021]
5389 * [Add --all-features flag to cargo][cargo/3038]
5390 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5391 * [Don't parse the home directory more than once][cargo/3078]
5392 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5393 * [Update OpenSSL to 1.0.2j][cargo/3121]
5394 * [Add license and license_file to cargo metadata output][cargo/3110]
5395 * [Make crates-io registry URL optional in config; ignore all changes to
5396 source.crates-io][cargo/3089]
5397 * [Don't download dependencies from other platforms][cargo/3123]
5398 * [Build transitive dev-dependencies when needed][cargo/3125]
5399 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5400 * [Avoid updating registry when adding existing deps][cargo/3144]
5401 * [Warn about path overrides that won't work][cargo/3136]
5402 * [Use workspaces during `cargo install`][cargo/3146]
5403 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5404 * [Add --message-format flag][cargo/3000]
5405 * [Pass target environment for rustdoc][cargo/3205]
5406 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5407 * [Update curl and curl-sys][cargo/3241]
5408 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5413 * [rustdoc: Add the `--sysroot` argument][36586]
5414 * [rustdoc: Fix a couple of issues with the search results][35655]
5415 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5416 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5417 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5422 * [Remove unmaintained style guide][35124]
5423 * [Add s390x support][36369]
5424 * [Initial work at Haiku OS support][36727]
5425 * [Add mips-uclibc targets][35734]
5426 * [Crate-ify compiler-rt into compiler-builtins][35021]
5427 * [Add rustc version info (git hash + date) to dist tarball][36213]
5428 * Many documentation improvements
5433 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5434 * [Deny (by default) transmuting from fn item types to pointer-sized
5435 types][34923]. Continuing the long transition to zero-sized fn items,
5437 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5439 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5440 * [Fix lifetime rules for 'if' conditions][36029].
5441 * [Inherit overflow checks for sum and product][36372].
5442 * [Forbid user-defined macros named "macro_rules"][36730].
5444 [33922]: https://github.com/rust-lang/rust/pull/33922
5445 [34623]: https://github.com/rust-lang/rust/pull/34623
5446 [34923]: https://github.com/rust-lang/rust/pull/34923
5447 [34942]: https://github.com/rust-lang/rust/pull/34942
5448 [34982]: https://github.com/rust-lang/rust/pull/34982
5449 [35021]: https://github.com/rust-lang/rust/pull/35021
5450 [35048]: https://github.com/rust-lang/rust/pull/35048
5451 [35074]: https://github.com/rust-lang/rust/pull/35074
5452 [35124]: https://github.com/rust-lang/rust/pull/35124
5453 [35234]: https://github.com/rust-lang/rust/pull/35234
5454 [35238]: https://github.com/rust-lang/rust/pull/35238
5455 [35354]: https://github.com/rust-lang/rust/pull/35354
5456 [35559]: https://github.com/rust-lang/rust/pull/35559
5457 [35585]: https://github.com/rust-lang/rust/pull/35585
5458 [35627]: https://github.com/rust-lang/rust/pull/35627
5459 [35655]: https://github.com/rust-lang/rust/pull/35655
5460 [35702]: https://github.com/rust-lang/rust/pull/35702
5461 [35707]: https://github.com/rust-lang/rust/pull/35707
5462 [35728]: https://github.com/rust-lang/rust/pull/35728
5463 [35734]: https://github.com/rust-lang/rust/pull/35734
5464 [35755]: https://github.com/rust-lang/rust/pull/35755
5465 [35761]: https://github.com/rust-lang/rust/pull/35761
5466 [35764]: https://github.com/rust-lang/rust/pull/35764
5467 [35814]: https://github.com/rust-lang/rust/pull/35814
5468 [35854]: https://github.com/rust-lang/rust/pull/35854
5469 [35871]: https://github.com/rust-lang/rust/pull/35871
5470 [35884]: https://github.com/rust-lang/rust/pull/35884
5471 [35911]: https://github.com/rust-lang/rust/pull/35911
5472 [35969]: https://github.com/rust-lang/rust/pull/35969
5473 [35975]: https://github.com/rust-lang/rust/pull/35975
5474 [36004]: https://github.com/rust-lang/rust/pull/36004
5475 [36008]: https://github.com/rust-lang/rust/pull/36008
5476 [36014]: https://github.com/rust-lang/rust/pull/36014
5477 [36029]: https://github.com/rust-lang/rust/pull/36029
5478 [36059]: https://github.com/rust-lang/rust/pull/36059
5479 [36072]: https://github.com/rust-lang/rust/pull/36072
5480 [36101]: https://github.com/rust-lang/rust/pull/36101
5481 [36104]: https://github.com/rust-lang/rust/pull/36104
5482 [36171]: https://github.com/rust-lang/rust/pull/36171
5483 [36173]: https://github.com/rust-lang/rust/pull/36173
5484 [36178]: https://github.com/rust-lang/rust/pull/36178
5485 [36213]: https://github.com/rust-lang/rust/pull/36213
5486 [36214]: https://github.com/rust-lang/rust/pull/36214
5487 [36264]: https://github.com/rust-lang/rust/pull/36264
5488 [36266]: https://github.com/rust-lang/rust/pull/36266
5489 [36289]: https://github.com/rust-lang/rust/pull/36289
5490 [36338]: https://github.com/rust-lang/rust/pull/36338
5491 [36351]: https://github.com/rust-lang/rust/pull/36351
5492 [36355]: https://github.com/rust-lang/rust/pull/36355
5493 [36369]: https://github.com/rust-lang/rust/pull/36369
5494 [36372]: https://github.com/rust-lang/rust/pull/36372
5495 [36423]: https://github.com/rust-lang/rust/pull/36423
5496 [36482]: https://github.com/rust-lang/rust/pull/36482
5497 [36505]: https://github.com/rust-lang/rust/pull/36505
5498 [36524]: https://github.com/rust-lang/rust/pull/36524
5499 [36527]: https://github.com/rust-lang/rust/pull/36527
5500 [36551]: https://github.com/rust-lang/rust/pull/36551
5501 [36574]: https://github.com/rust-lang/rust/pull/36574
5502 [36586]: https://github.com/rust-lang/rust/pull/36586
5503 [36592]: https://github.com/rust-lang/rust/pull/36592
5504 [36631]: https://github.com/rust-lang/rust/pull/36631
5505 [36639]: https://github.com/rust-lang/rust/pull/36639
5506 [36721]: https://github.com/rust-lang/rust/pull/36721
5507 [36727]: https://github.com/rust-lang/rust/pull/36727
5508 [36730]: https://github.com/rust-lang/rust/pull/36730
5509 [36734]: https://github.com/rust-lang/rust/pull/36734
5510 [36754]: https://github.com/rust-lang/rust/pull/36754
5511 [36995]: https://github.com/rust-lang/rust/pull/36995
5512 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5513 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5514 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5515 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5516 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5517 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5518 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5519 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5520 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5521 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5522 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5523 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5524 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5525 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5526 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5527 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5528 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5529 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5530 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5531 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5532 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5533 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5534 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5535 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5536 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5537 [rustup]: https://www.rustup.rs
5538 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5539 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5540 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5541 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5542 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5543 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5544 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5547 Version 1.12.1 (2016-10-20)
5548 ===========================
5553 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5554 * [Confusion with double negation and booleans][36856]
5555 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5556 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5557 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5558 * [Corrupted memory after updated to 1.12][36936]
5559 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5560 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5561 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5563 [36381]: https://github.com/rust-lang/rust/issues/36381
5564 [36856]: https://github.com/rust-lang/rust/issues/36856
5565 [36875]: https://github.com/rust-lang/rust/issues/36875
5566 [36924]: https://github.com/rust-lang/rust/issues/36924
5567 [36926]: https://github.com/rust-lang/rust/issues/36926
5568 [36936]: https://github.com/rust-lang/rust/issues/36936
5569 [37026]: https://github.com/rust-lang/rust/issues/37026
5570 [37112]: https://github.com/rust-lang/rust/issues/37112
5571 [37153]: https://github.com/rust-lang/rust/issues/37153
5574 Version 1.12.0 (2016-09-29)
5575 ===========================
5580 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5581 This translation pass is far simpler than the previous AST->LLVM pass, and
5582 creates opportunities to perform new optimizations directly on the MIR. It
5583 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5584 * [`rustc` presents a new, more readable error format, along with
5585 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5586 Most common editors supporting Rust have been updated to work with it. It was
5587 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5592 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5593 This translation pass is far simpler than the previous AST->LLVM pass, and
5594 creates opportunities to perform new optimizations directly on the MIR. It
5595 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5596 * [Print the Rust target name, not the LLVM target name, with
5597 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5598 * [The computation of `TypeId` is correct in some cases where it was previously
5599 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5600 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5601 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5602 `--print relocation-models`, and `--print code-models` print the available
5603 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5604 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5605 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5606 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5607 These targets produce statically-linked binaries. There are no binary release
5613 * [`rustc` presents a new, more readable error format, along with
5614 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5615 Most common editors supporting Rust have been updated to work with it. It was
5616 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5617 * [In error descriptions, references are now described in plain English,
5618 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5619 * [In error type descriptions, unknown numeric types are named `{integer}` or
5620 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5621 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5626 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5627 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5628 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5629 useful](https://github.com/rust-lang/rust/pull/34908)
5630 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5631 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5632 * [Semicolons are properly required as statement delimiters inside
5633 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5634 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5639 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5640 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5641 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5642 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5643 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5644 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5645 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5646 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5647 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5648 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5649 Both on Unix and Windows.
5650 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5651 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5652 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5653 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5654 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5655 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5656 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5657 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5662 * [The `format!` macro and friends now allow a single argument to be formatted
5663 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5664 * [The lifetime bounds on `[T]::binary_search_by` and
5665 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5666 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5667 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5668 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5669 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5670 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5671 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5672 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5673 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5674 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5675 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5676 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5677 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5678 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5679 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5680 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5681 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5682 * [`mpsc::sync_channel` `Receiver`s return any available message before
5683 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5684 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5685 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5690 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5691 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5692 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5693 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5694 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5695 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5696 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5697 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5698 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5699 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5700 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5701 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5702 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5703 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5704 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5705 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5710 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5711 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5716 * [Test binaries now support a `--test-threads` argument to specify the number
5717 of threads used to run tests, and which acts the same as the
5718 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5719 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5720 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5721 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5722 * [Rust releases now come with source packages that can be installed by rustup
5723 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5724 The resulting source code can be used by tools and IDES, located in the
5725 sysroot under `lib/rustlib/src`.
5730 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5731 * Many minor improvements to the documentation.
5732 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5737 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5738 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5739 * [When formatting strings, if "precision" is specified, the "fill",
5740 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5741 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5744 Version 1.11.0 (2016-08-18)
5745 ===========================
5750 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5751 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5752 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5753 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5758 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5759 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5760 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5761 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5762 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5763 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5764 (in libcore - previously stabilized in libstd)
5765 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5766 (in libcore - previously stabilized in libstd)
5767 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5768 (in libcore - previously stabilized in libstd)
5769 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5770 (in libcore - previously stabilized in libstd)
5771 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5772 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5773 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5774 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5779 * [The `thread_local!` macro supports multiple definitions in a single
5780 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5781 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5782 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5783 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5784 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5785 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5786 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5787 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5792 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5793 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5794 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5795 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5796 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5797 and `-vv` prints warnings for all crates.
5798 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5799 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5800 This provides room for expansion by arbitrary tools.
5801 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5802 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5803 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5804 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5805 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5806 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5807 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5812 * [Caching projections speeds up type check dramatically for some
5813 workloads](https://github.com/rust-lang/rust/pull/33816)
5814 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5815 This hasher is faster, but is believed to provide sufficient
5816 protection from collision attacks.
5817 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5822 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5823 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5824 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5825 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5826 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5831 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5832 * [When emitting debug info, rustc emits frame pointers for closures,
5833 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5834 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5835 * Many more errors have been given error codes and extended
5837 * API documentation continues to be improved, with many new examples
5842 * [rustc no longer hangs when dependencies recursively re-export
5843 submodules](https://github.com/rust-lang/rust/pull/34542)
5844 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5845 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5846 rewritten](https://github.com/rust-lang/rust/pull/33895)
5847 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5848 No targets use this yet, but it works toward AVR support.
5853 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5854 * [The new follow-set rules that place restrictions on `macro_rules!`
5855 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5856 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5857 and has been a warning since 1.10.
5858 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5859 This causes breakage in some corner cases.
5862 Version 1.10.0 (2016-07-07)
5863 ===========================
5868 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5869 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5870 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5871 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5872 * [`panic!` can be converted to a runtime abort with the
5873 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5874 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5875 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5876 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5877 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5878 Note that Cargo does not yet directly support cdylibs.
5883 * `os::windows::fs::OpenOptionsExt::access_mode`
5884 * `os::windows::fs::OpenOptionsExt::share_mode`
5885 * `os::windows::fs::OpenOptionsExt::custom_flags`
5886 * `os::windows::fs::OpenOptionsExt::attributes`
5887 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5888 * `os::unix::fs::OpenOptionsExt::custom_flags`
5889 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5890 * `Default for sync::Weak`
5891 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5892 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5893 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5894 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5895 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5896 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5897 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5898 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5899 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5900 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5901 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5902 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5903 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5904 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5905 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5906 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5907 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5908 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5909 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5910 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5911 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5912 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5913 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5914 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5915 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5916 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5917 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5918 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5919 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5920 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5921 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5922 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5923 * Read/Write/RawFd impls for `UnixStream`
5924 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5925 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5926 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5927 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5928 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5929 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5930 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5931 * RawFd impls for `UnixListener`
5932 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5933 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5934 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5935 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5936 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5937 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5938 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5939 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5940 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5941 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5942 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5943 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5944 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5945 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5946 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5947 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5948 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5949 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5950 * RawFd impls for `UnixDatagram`
5951 * `{BTree,Hash}Map::values_mut`
5952 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5957 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5958 The semantics of this minor method are subtle and probably not what
5960 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5961 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5962 will fall back to `/dev/urandom` temporarily to avoid blocking
5963 during early boot](https://github.com/rust-lang/rust/pull/33086).
5964 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5965 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5966 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5967 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5968 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5969 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5970 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5974 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5975 This controls the runtime behavior of the `panic!` macro
5976 and can be either "unwind" (the default), or "abort".
5977 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5978 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5979 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5980 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5981 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5982 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5983 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5984 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5985 By default they are retried twice, which can be customized with the
5986 `net.retry` value in `.cargo/config`.
5987 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5988 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5989 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5990 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5991 Makes it possible to install multiple crates in parallel.
5992 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5993 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5994 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5995 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5996 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5997 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
6002 * [rustc memory usage was reduced by refactoring the context used for
6003 type checking](https://github.com/rust-lang/rust/pull/33425).
6004 * [Speed up creation of `HashMap`s by caching the random keys used
6005 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6006 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6007 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6008 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6009 10x faster than the previous lookup tables.
6010 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6015 * Many incremental improvements to documentation and rustdoc.
6016 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6017 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6018 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6019 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6020 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6021 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6022 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6027 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6028 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6029 * [`std` no longer prints backtraces on platforms where the running
6030 module must be loaded with `env::current_exe`, which can't be relied
6031 on](https://github.com/rust-lang/rust/pull/33554).
6032 * This release includes std binaries for the i586-unknown-linux-gnu,
6033 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6034 i586 target is for old x86 hardware without SSE2, and the armv7
6035 target is for Android running on modern ARM architectures.
6036 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6037 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6038 * [On Unix the runtime aborts by calling `libc::abort` instead of
6039 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6040 * [Rust is now bootstrapped from the previous release of Rust,
6041 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6046 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6047 * [`target_env` for Linux ARM targets is just `gnu`, not
6048 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6049 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6050 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6051 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6052 Affects how macros are parsed.
6053 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6054 * [Feature-gated attributes on macro-generated macro invocations are
6055 now rejected](https://github.com/rust-lang/rust/pull/32791).
6056 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6057 This caused some minor changes to type inference.
6060 Version 1.9.0 (2016-05-26)
6061 ==========================
6066 * The `#[deprecated]` attribute when applied to an API will generate
6067 warnings when used. The warnings may be suppressed with
6068 `#[allow(deprecated)]`. [RFC 1270].
6069 * [`fn` item types are zero sized, and each `fn` names a unique
6070 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6071 `transmute` on a `fn` type will generate a warning for a few cycles,
6072 then will be converted to an error.
6073 * [Field and method resolution understand visibility, so private
6074 fields and methods cannot prevent the proper use of public fields
6075 and methods][1.9fv].
6076 * [The parser considers unicode codepoints in the
6077 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6083 * [`std::panic::catch_unwind`] (renamed from `recover`)
6084 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6085 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6086 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6087 * [`str::is_char_boundary`]
6088 * [`<*const T>::as_ref`]
6089 * [`<*mut T>::as_ref`]
6090 * [`<*mut T>::as_mut`]
6091 * [`AsciiExt::make_ascii_uppercase`]
6092 * [`AsciiExt::make_ascii_lowercase`]
6093 * [`char::decode_utf16`]
6094 * [`char::DecodeUtf16`]
6095 * [`char::DecodeUtf16Error`]
6096 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6097 * [`BTreeSet::take`]
6098 * [`BTreeSet::replace`]
6101 * [`HashSet::replace`]
6103 * [`OsString::with_capacity`]
6104 * [`OsString::clear`]
6105 * [`OsString::capacity`]
6106 * [`OsString::reserve`]
6107 * [`OsString::reserve_exact`]
6108 * [`OsStr::is_empty`]
6110 * [`std::os::unix::thread`]
6113 * [`JoinHandleExt::as_pthread_t`]
6114 * [`JoinHandleExt::into_pthread_t`]
6115 * [`HashSet::hasher`]
6116 * [`HashMap::hasher`]
6117 * [`CommandExt::exec`]
6118 * [`File::try_clone`]
6119 * [`SocketAddr::set_ip`]
6120 * [`SocketAddr::set_port`]
6121 * [`SocketAddrV4::set_ip`]
6122 * [`SocketAddrV4::set_port`]
6123 * [`SocketAddrV6::set_ip`]
6124 * [`SocketAddrV6::set_port`]
6125 * [`SocketAddrV6::set_flowinfo`]
6126 * [`SocketAddrV6::set_scope_id`]
6127 * [`slice::copy_from_slice`]
6128 * [`ptr::read_volatile`]
6129 * [`ptr::write_volatile`]
6130 * [`OpenOptions::create_new`]
6131 * [`TcpStream::set_nodelay`]
6132 * [`TcpStream::nodelay`]
6133 * [`TcpStream::set_ttl`]
6134 * [`TcpStream::ttl`]
6135 * [`TcpStream::set_only_v6`]
6136 * [`TcpStream::only_v6`]
6137 * [`TcpStream::take_error`]
6138 * [`TcpStream::set_nonblocking`]
6139 * [`TcpListener::set_ttl`]
6140 * [`TcpListener::ttl`]
6141 * [`TcpListener::set_only_v6`]
6142 * [`TcpListener::only_v6`]
6143 * [`TcpListener::take_error`]
6144 * [`TcpListener::set_nonblocking`]
6145 * [`UdpSocket::set_broadcast`]
6146 * [`UdpSocket::broadcast`]
6147 * [`UdpSocket::set_multicast_loop_v4`]
6148 * [`UdpSocket::multicast_loop_v4`]
6149 * [`UdpSocket::set_multicast_ttl_v4`]
6150 * [`UdpSocket::multicast_ttl_v4`]
6151 * [`UdpSocket::set_multicast_loop_v6`]
6152 * [`UdpSocket::multicast_loop_v6`]
6153 * [`UdpSocket::set_multicast_ttl_v6`]
6154 * [`UdpSocket::multicast_ttl_v6`]
6155 * [`UdpSocket::set_ttl`]
6156 * [`UdpSocket::ttl`]
6157 * [`UdpSocket::set_only_v6`]
6158 * [`UdpSocket::only_v6`]
6159 * [`UdpSocket::join_multicast_v4`]
6160 * [`UdpSocket::join_multicast_v6`]
6161 * [`UdpSocket::leave_multicast_v4`]
6162 * [`UdpSocket::leave_multicast_v6`]
6163 * [`UdpSocket::take_error`]
6164 * [`UdpSocket::connect`]
6165 * [`UdpSocket::send`]
6166 * [`UdpSocket::recv`]
6167 * [`UdpSocket::set_nonblocking`]
6172 * [`std::sync::Once` is poisoned if its initialization function
6174 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6175 * [Most types implement `fmt::Debug`][1.9db].
6176 * [The default buffer size used by `BufReader` and `BufWriter` was
6177 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6178 used by other languages.
6179 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6180 `Duration` additionally implements `*=` and `/=`][1.9ta].
6181 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6182 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6183 * [`Chain` implements `BufRead`][1.9ch].
6184 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6189 * [Cargo can now run concurrently][1.9cc].
6190 * [Top-level overrides allow specific revisions of crates to be
6191 overridden through the entire crate graph][1.9ct]. This is intended
6192 to make upgrades easier for large projects, by allowing crates to be
6193 forked temporarily until they've been upgraded and republished.
6194 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6195 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6196 on the commandline][1.9cf]. `rustc` arguments can also be specified
6197 in the `build.rustflags` configuration key.
6202 * [The time complexity of comparing variables for equivalence during type
6203 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6204 to major compilation time improvement in some scenarios.
6205 * [`ToString` is specialized for `str`, giving it the same performance
6206 as `to_owned`][1.9ts].
6207 * [Spawning processes with `Command::output` no longer creates extra
6209 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6210 for C-like enums][1.9cl].
6215 * [Passing the `--quiet` flag to a test runner will produce
6216 much-abbreviated output][1.9q].
6217 * The Rust Project now publishes std binaries for the
6218 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6219 `i586-pc-windows-msvc` targets.
6224 * [`std::sync::Once` is poisoned if its initialization function
6226 * [It is illegal to define methods with the same name in overlapping
6227 inherent `impl` blocks][1.9sn].
6228 * [`fn` item types are zero sized, and each `fn` names a unique
6229 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6230 `transmute` on a `fn` type will generate a warning for a few cycles,
6231 then will be converted to an error.
6232 * [Improvements to const evaluation may trigger new errors when integer
6233 literals are out of range][1.9ce].
6236 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6237 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6238 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6239 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6240 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6241 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6242 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6243 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6244 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6245 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6246 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6247 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6248 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6249 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6250 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6251 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6252 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6253 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6254 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6255 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6256 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6257 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6258 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6259 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6260 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6261 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6262 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6263 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6264 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6265 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6266 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6267 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6268 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6269 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6270 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6271 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6272 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6273 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6274 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6275 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6276 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6277 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6278 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6279 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6280 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6281 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6282 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6283 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6284 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6285 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6286 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6287 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6288 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6289 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6290 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6291 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6292 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6293 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6294 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6295 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6296 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6297 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6298 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6299 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6300 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6301 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6302 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6303 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6304 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6305 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6306 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6307 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6308 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6309 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6310 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6311 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6312 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6313 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6314 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6315 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6316 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6317 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6318 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6319 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6320 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6321 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6322 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6323 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6324 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6325 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6326 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6327 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6328 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6329 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6330 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6331 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6332 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6333 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6334 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6335 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6336 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6337 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6338 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6339 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6340 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6341 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6342 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6343 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6344 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6345 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6348 Version 1.8.0 (2016-04-14)
6349 ==========================
6354 * Rust supports overloading of compound assignment statements like
6355 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6356 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6357 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6359 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6360 addition to the non-braced form, `struct Foo;`. [RFC 218].
6366 * [`str::encode_utf16`] (renamed from `utf16_units`)
6367 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6370 * [`ptr::drop_in_place`]
6372 * [`time::SystemTime`]
6374 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6375 * [`Instant::elapsed`]
6376 * [`SystemTime::now`]
6377 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6378 * [`SystemTime::elapsed`]
6379 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6380 * [`SystemTimeError`]
6381 * [`SystemTimeError::duration`]
6382 * Various impls for `SystemTimeError`
6384 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6385 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6386 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6387 * [The `write!` and `writeln!` macros correctly emit errors if any of
6388 their arguments can't be formatted][1.8w].
6389 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6390 * [The Unix-specific `raw` modules, which contain a number of
6391 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6392 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6393 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6394 across platforms was making it difficult to implement `std`
6395 correctly. Those that need these definitions should use the `libc`
6397 * The Unix-specific `MetadataExt` traits, including
6398 `os::unix::fs::MetadataExt`, which expose values such as inode
6399 numbers [no longer return platform-specific types][1.8r], but
6400 instead return widened integers. [RFC 1415].
6401 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6402 * [Atomic loads and stores are not volatile][1.8a].
6403 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6408 * [Inlining hash functions lead to a 3% compile-time improvement in
6409 some workloads][1.8h].
6410 * When using jemalloc, its symbols are [unprefixed so that it
6411 overrides the libc malloc implementation][1.8h]. This means that for
6412 rustc, LLVM is now using jemalloc, which results in a 6%
6413 compile-time improvement on a specific workload.
6414 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6419 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6420 i686-pc-windows-msvc is now considered a tier-1 platform.
6421 * [The `--print targets` flag prints a list of supported targets][1.8t].
6422 * [The `--print cfg` flag prints the `cfg`s defined for the current
6424 * [`rustc` can be built with an new Cargo-based build system, written
6425 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6426 build system. To enable it configure with `configure --rustbuild`.
6427 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6428 variants while also indicating the total number of missing variants
6429 if more than 3][1.8m].
6430 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6431 * The Rust Project now publishes binary releases of the standard
6432 library for a number of tier-2 targets:
6433 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6434 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6435 `x86_64-rumprun-netbsd`. These can be installed with
6436 tools such as [multirust][1.8mr].
6441 * [`cargo init` creates a new Cargo project in the current
6442 directory][1.8ci]. It is otherwise like `cargo new`.
6443 * [Cargo has configuration keys for `-v` and
6444 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6445 `[term]` section of `.cargo/config`.
6446 * [Configuration keys that evaluate to strings or integers can be set
6447 via environment variables][1.8ce]. For example the `build.jobs` key
6448 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6449 precedence over config files.
6450 * [Target-specific dependencies support Rust `cfg` syntax for
6451 describing targets][1.8cfg] so that dependencies for multiple
6452 targets can be specified together. [RFC 1361].
6453 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6454 `RUSTDOC` take precedence over the `build.target-dir`,
6455 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6456 * [The child process tree is killed on Windows when Cargo is
6458 * [The `build.target` configuration value sets the target platform,
6459 like `--target`][1.8ct].
6464 * [Unstable compiler flags have been further restricted][1.8u]. Since
6465 1.0 `-Z` flags have been considered unstable, and other flags that
6466 were considered unstable additionally required passing `-Z
6467 unstable-options` to access. Unlike unstable language and library
6468 features though, these options have been accessible on the stable
6469 release channel. Going forward, *new unstable flags will not be
6470 available on the stable release channel*, and old unstable flags
6471 will warn about their usage. In the future, all unstable flags will
6472 be unavailable on the stable release channel.
6473 * [It is no longer possible to `match` on empty enum variants using
6474 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6475 * The Unix-specific `MetadataExt` traits, including
6476 `os::unix::fs::MetadataExt`, which expose values such as inode
6477 numbers [no longer return platform-specific types][1.8r], but
6478 instead return widened integers. [RFC 1415].
6479 * [Modules sourced from the filesystem cannot appear within arbitrary
6480 blocks, but only within other modules][1.8mf].
6481 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6482 * On Unix, [stack overflow triggers a runtime abort instead of a
6484 * [`Command::spawn` and its equivalents return an error if any of
6485 its command-line arguments contain interior `NUL`s][1.8n].
6486 * [Tuple and unit enum variants from other crates are in the type
6488 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6489 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6490 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6491 instead of `foo.lib`.
6494 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6495 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6496 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6497 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6498 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6499 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6500 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6501 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6502 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6503 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6504 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6505 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6506 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6507 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6508 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6509 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6510 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6511 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6512 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6513 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6514 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6515 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6516 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6517 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6518 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6519 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6520 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6521 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6522 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6523 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6524 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6525 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6526 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6527 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6528 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6529 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6530 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6531 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6532 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6533 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6534 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6535 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6536 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6537 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6538 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6539 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6540 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6541 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6542 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6543 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6544 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6545 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6546 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6547 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6548 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6549 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6550 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6551 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6552 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6553 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6556 Version 1.7.0 (2016-03-03)
6557 ==========================
6564 * [`Path::strip_prefix`] (renamed from relative_from)
6565 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6567 * [`Ipv4Addr::is_loopback`]
6568 * [`Ipv4Addr::is_private`]
6569 * [`Ipv4Addr::is_link_local`]
6570 * [`Ipv4Addr::is_multicast`]
6571 * [`Ipv4Addr::is_broadcast`]
6572 * [`Ipv4Addr::is_documentation`]
6574 * [`Ipv6Addr::is_unspecified`]
6575 * [`Ipv6Addr::is_loopback`]
6576 * [`Ipv6Addr::is_multicast`]
6579 * [`Vec::as_mut_slice`]
6581 * [`String::as_str`]
6582 * [`String::as_mut_str`]
6584 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6586 * `<[T]>::`[`sort_by_key`]
6587 * checked, saturated, and overflowing operations
6588 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6589 * [`i32::saturating_mul`]
6590 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6591 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6592 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6593 * [`u32::saturating_mul`]
6594 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6595 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6596 * and checked, saturated, and overflowing operations for other primitive types
6598 * [`ffi::IntoStringError`]
6599 * [`CString::into_string`]
6600 * [`CString::into_bytes`]
6601 * [`CString::into_bytes_with_nul`]
6602 * `From<CString> for Vec<u8>`
6604 * [`IntoStringError::into_cstring`]
6605 * [`IntoStringError::utf8_error`]
6606 * `Error for IntoStringError`
6608 * [`std::hash::BuildHasher`]
6609 * [`BuildHasher::Hasher`]
6610 * [`BuildHasher::build_hasher`]
6611 * [`std::hash::BuildHasherDefault`]
6612 * [`HashMap::with_hasher`]
6613 * [`HashMap::with_capacity_and_hasher`]
6614 * [`HashSet::with_hasher`]
6615 * [`HashSet::with_capacity_and_hasher`]
6616 * [`std::collections::hash_map::RandomState`]
6617 * [`RandomState::new`]
6618 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6619 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6620 from bytes is faster.
6621 * [The performance of `LineWriter` (and thus `io::stdout`) was
6622 improved by using `memchr` to search for newlines][1.7m].
6623 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6624 `f64` variants were stabilized previously.
6625 * [`BTreeMap` was rewritten to use less memory and improve the performance
6626 of insertion and iteration, the latter by as much as 5x][1.7bm].
6627 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6628 covariant over their contained type][1.7bt].
6629 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6630 over their contained type][1.7ll].
6631 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6633 * [`Any` is implemented for unsized types][1.7a].
6634 * [`Hash` is implemented for `Duration`][1.7h].
6639 * [When running tests with `--test`, rustdoc will pass `--cfg`
6640 arguments to the compiler][1.7dt].
6641 * [The compiler is built with RPATH information by default][1.7rpa].
6642 This means that it will be possible to run `rustc` when installed in
6643 unusual configurations without configuring the dynamic linker search
6645 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6646 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6647 over `LD_LIBRARY_PATH`.
6652 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6653 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6654 * [The `rerun-if-changed` build script directive no longer causes the
6655 build script to incorrectly run twice in certain scenarios][1.7rr].
6660 * Soundness fixes to the interactions between associated types and
6661 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6662 code that violates the new rules. This is a significant change that
6663 is known to break existing code, so it has emitted warnings for the
6664 new error cases since 1.4 to give crate authors time to adapt. The
6665 details of what is changing are subtle; read the RFC for more.
6666 * [Several bugs in the compiler's visibility calculations were
6667 fixed][1.7v]. Since this was found to break significant amounts of
6668 code, the new errors will be emitted as warnings for several release
6669 cycles, under the `private_in_public` lint.
6670 * Defaulted type parameters were accidentally accepted in positions
6671 that were not intended. In this release, [defaulted type parameters
6672 appearing outside of type definitions will generate a
6673 warning][1.7d], which will become an error in future releases.
6674 * [Parsing "." as a float results in an error instead of 0][1.7p].
6675 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6676 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6678 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6679 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6680 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6681 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6682 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6683 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6684 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6685 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6686 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6687 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6688 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6689 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6690 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6691 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6692 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6693 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6694 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6695 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6696 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6697 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6698 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6699 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6700 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6701 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6702 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6703 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6704 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6705 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6706 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6707 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6708 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6709 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6710 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6711 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6712 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6713 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6714 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6715 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6716 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6717 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6718 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6719 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6720 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6721 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6722 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6723 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6724 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6725 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6726 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6727 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6728 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6729 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6730 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6731 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6732 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6733 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6734 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6735 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6736 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6737 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6738 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6739 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6740 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6741 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6742 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6743 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6744 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6745 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6746 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6747 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6748 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6749 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6750 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6751 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6752 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6753 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6754 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6755 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6756 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6759 Version 1.6.0 (2016-01-21)
6760 ==========================
6765 * The `#![no_std]` attribute causes a crate to not be linked to the
6766 standard library, but only the [core library][1.6co], as described
6767 in [RFC 1184]. The core library defines common types and traits but
6768 has no platform dependencies whatsoever, and is the basis for Rust
6769 software in environments that cannot support a full port of the
6770 standard library, such as operating systems. Most of the core
6771 library is now stable.
6777 [`Read::read_exact`],
6778 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6779 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6780 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6781 [`os::unix::fs::DirBuilderExt`],
6782 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6783 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6784 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6785 [`collections::hash_map::Drain`],
6786 [`collections::hash_map::HashMap::drain`],
6787 [`collections::hash_set::Drain`],
6788 [`collections::hash_set::HashSet::drain`],
6789 [`collections::binary_heap::Drain`],
6790 [`collections::binary_heap::BinaryHeap::drain`],
6791 [`Vec::extend_from_slice`] (renamed from `push_all`),
6792 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6793 [`RwLock::into_inner`],
6794 [`Iterator::min_by_key`] (renamed from `min_by`),
6795 [`Iterator::max_by_key`] (renamed from `max_by`).
6796 * The [core library][1.6co] is stable, as are most of its APIs.
6797 * [The `assert_eq!` macro supports arguments that don't implement
6798 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6800 * Several timer functions that take duration in milliseconds [are
6801 deprecated in favor of those that take `Duration`][1.6ms]. These
6802 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6803 `thread::park_timeout_ms`.
6804 * The algorithm by which `Vec` reserves additional elements was
6805 [tweaked to not allocate excessive space][1.6a] while still growing
6807 * `From` conversions are [implemented from integers to floats][1.6f]
6808 in cases where the conversion is lossless. Thus they are not
6809 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6810 or `f64`. They are also not implemented for `isize` and `usize`
6811 because the implementations would be platform-specific. `From` is
6812 also implemented from `f32` to `f64`.
6813 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6814 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6815 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6816 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6818 * Sorting slices that are already sorted [is 50% faster in some
6824 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6825 * Cargo build scripts can specify their dependencies by emitting the
6826 [`rerun-if-changed`][1.6rr] key.
6827 * crates.io will reject publication of crates with dependencies that
6828 have a wildcard version constraint. Crates with wildcard
6829 dependencies were seen to cause a variety of problems, as described
6830 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6832 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6833 release folder. A variety of artifacts that Cargo failed to clean
6834 are now correctly deleted.
6839 * The `unreachable_code` lint [warns when a function call's argument
6841 * The parser indicates [failures that may be caused by
6842 confusingly-similar Unicode characters][1.6uc]
6843 * Certain macro errors [are reported at definition time][1.6m], not
6849 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6850 environment variable when locating crates. This was a pre-cargo
6851 feature for integrating with the package manager that was
6852 accidentally never removed.
6853 * [A number of bugs were fixed in the privacy checker][1.6p] that
6854 could cause previously-accepted code to break.
6855 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6856 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6857 struct pattern syntax (`Foo(..)`) can no longer be used to match
6858 unit structs. This is a warning now, but will become an error in
6859 future releases. Patterns that share the same name as a const are
6861 * A bug was fixed that causes [rustc not to apply default type
6862 parameters][1.6xc] when resolving certain method implementations of
6863 traits defined in other crates.
6865 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6866 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6867 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6868 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6869 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6870 [1.6co]: http://doc.rust-lang.org/core/index.html
6871 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6872 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6873 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6874 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6875 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6876 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6877 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6878 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6879 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6880 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6881 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6882 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6883 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6884 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6885 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6886 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6887 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6888 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6889 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6890 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6891 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6892 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6893 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6894 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6895 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6896 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6897 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6898 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6899 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6900 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6901 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6902 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6903 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6904 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6905 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6906 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6907 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6908 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6909 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6910 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6911 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6914 Version 1.5.0 (2015-12-10)
6915 ==========================
6917 * ~700 changes, numerous bugfixes
6923 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6924 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6925 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6926 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6927 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6928 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6929 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6930 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6931 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6932 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6933 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6934 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6935 [`Path::read_link`], [`Path::symlink_metadata`],
6936 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6937 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6938 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6939 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6940 [`slice::split_first_mut`], [`slice::split_first`],
6941 [`slice::split_last_mut`], [`slice::split_last`],
6942 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6943 [`str::MatchIndices`], [`str::RMatchIndices`],
6944 [`str::match_indices`], [`str::rmatch_indices`],
6945 [`str::slice_mut_unchecked`], [`string::ParseError`].
6946 * Rust applications hosted on crates.io can be installed locally to
6947 `~/.cargo/bin` with the [`cargo install`] command. Among other
6948 things this makes it easier to augment Cargo with new subcommands:
6949 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6950 invoked as `cargo foo`.
6951 * Crates with wildcard (`*`) dependencies will [emit warnings when
6952 published][1.5w]. In 1.6 it will no longer be possible to publish
6953 crates with wildcard dependencies.
6958 * The rules determining when a particular lifetime must outlive
6959 a particular value (known as '[dropck]') have been [modified
6960 to not rely on parametricity][1.5p].
6961 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6962 and `Arc`][1.5a]. Because these smart pointer types implement
6963 `Deref`, this causes breakage in cases where the interior type
6964 contains methods of the same name.
6965 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6966 that they could drop their content. Soundness fix.
6967 * All method invocations are [properly checked][1.5wf1] for
6968 [well-formedness][1.5wf2]. Soundness fix.
6969 * Traits whose supertraits contain `Self` are [not object
6970 safe][1.5o]. Soundness fix.
6971 * Target specifications support a [`no_default_libraries`][1.5nd]
6972 setting that controls whether `-nodefaultlibs` is passed to the
6973 linker, and in turn the `is_like_windows` setting no longer affects
6974 the `-nodefaultlibs` flag.
6975 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6976 * The `#[inline]` and `#[repr]` attributes [can only appear
6977 in valid locations][1.5at].
6978 * Native libraries linked from the local crate are [passed to
6979 the linker before native libraries from upstream crates][1.5nl].
6980 * Two rarely-used attributes, `#[no_debug]` and
6981 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6982 * Negation of unsigned integers, which has been a warning for
6983 several releases, [is now behind a feature gate and will
6984 generate errors][1.5nu].
6985 * The parser accidentally accepted visibility modifiers on
6986 enum variants, a bug [which has been fixed][1.5ev].
6987 * [A bug was fixed that allowed `use` statements to import unstable
6993 * When evaluating expressions at compile-time that are not
6994 compile-time constants (const-evaluating expressions in non-const
6995 contexts), incorrect code such as overlong bitshifts and arithmetic
6996 overflow will [generate a warning instead of an error][1.5ce],
6997 delaying the error until runtime. This will allow the
6998 const-evaluator to be expanded in the future backwards-compatibly.
6999 * The `improper_ctypes` lint [no longer warns about using `isize` and
7000 `usize` in FFI][1.5ict].
7005 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7007 * `Default` is [implemented for mutable slices][1.5d].
7008 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7009 * There are now `From` conversions [between floating point
7010 types][1.5f] where the conversions are lossless.
7011 * There are now `From` conversions [between integer types][1.5i] where
7012 the conversions are lossless.
7013 * [`fs::Metadata` implements `Clone`][1.5fs].
7014 * The `parse` method [accepts a leading "+" when parsing
7016 * [`AsMut` is implemented for `Vec`][1.5am].
7017 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7018 been optimized][1.5cf] and no longer rely on the default impl.
7019 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7020 `unsafe extern "C"` function types now [implement `Clone`,
7021 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7022 `fmt::Debug` for up to 12 arguments][1.5fp].
7023 * [Dropping `Vec`s is much faster in unoptimized builds when the
7024 element types don't implement `Drop`][1.5dv].
7025 * A bug that caused in incorrect behavior when [combining `VecDeque`
7026 with zero-sized types][1.5vdz] was resolved.
7027 * [`PartialOrd` for slices is faster][1.5po].
7032 * [Crate metadata size was reduced by 20%][1.5md].
7033 * [Improvements to code generation reduced the size of libcore by 3.3
7034 MB and rustc's memory usage by 18MB][1.5m].
7035 * [Improvements to deref translation increased performance in
7036 unoptimized builds][1.5dr].
7037 * Various errors in trait resolution [are deduplicated to only be
7038 reported once][1.5te].
7039 * Rust has preliminary [support for rumprun kernels][1.5rr].
7040 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7042 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7043 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7044 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7045 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7046 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7047 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7048 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7049 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7050 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7051 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7052 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7053 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7054 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7055 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7056 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7057 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7058 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7059 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7060 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7061 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7062 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7063 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7064 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7065 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7066 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7067 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7068 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7069 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7070 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7071 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7072 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7073 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7074 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7075 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7076 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7077 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7078 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7079 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7080 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7081 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7082 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7083 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7084 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7085 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7086 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7087 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7088 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7089 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7090 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7091 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7092 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7093 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7094 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7095 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7096 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7097 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7098 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7099 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7100 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7101 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7102 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7103 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7104 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7105 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7106 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7107 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7108 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7109 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7110 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7111 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7112 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7113 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7114 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7115 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7116 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7117 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7118 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7119 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7120 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7121 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7122 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7123 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7124 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7125 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7126 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7127 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7128 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7129 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7130 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7132 Version 1.4.0 (2015-10-29)
7133 ==========================
7135 * ~1200 changes, numerous bugfixes
7140 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7141 GNU) are now supported and recommended for use.
7146 * [Several changes have been made to fix type soundness and improve
7147 the behavior of associated types][sound]. See [RFC 1214]. Although
7148 we have mostly introduced these changes as warnings this release, to
7149 become errors next release, there are still some scenarios that will
7150 see immediate breakage.
7151 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7152 line breaks in addition to `\n`][crlf].
7153 * [Loans of `'static` lifetime extend to the end of a function][stat].
7154 * [`str::parse` no longer introduces avoidable rounding error when
7155 parsing floating point numbers. Together with earlier changes to
7156 float formatting/output, "round trips" like f.to_string().parse()
7157 now preserve the value of f exactly. Additionally, leading plus
7158 signs are now accepted][fp3].
7164 * `use` statements that import multiple items [can now rename
7165 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7166 * [Binops work correctly on fat pointers][binfat].
7167 * `pub extern crate`, which does not behave as expected, [issues a
7168 warning][pec] until a better solution is found.
7173 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7174 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7175 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7176 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7177 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7178 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7179 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7180 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7181 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7182 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7183 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7184 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7185 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7186 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7187 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7188 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7189 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7190 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7192 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7193 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7194 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7195 `f64::from_str_radix`.
7196 * [Reverse-searching strings is faster with the 'two-way'
7198 * [`std::io::copy` allows `?Sized` arguments][cc].
7199 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7200 [override `count`, `nth` and `last` with an O(1)
7201 implementation][it].
7202 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7203 * [`IntoRawFd` has been added to the Unix-specific prelude,
7204 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7206 * [`Extend<String>` and `FromIterator<String` are both implemented for
7208 * [`IntoIterator` is implemented for references to `Option` and
7210 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7211 Copy`][ext] as part of [RFC 839]. This will cause type inference
7212 breakage in rare situations.
7213 * [`BinaryHeap` implements `Debug`][bh2].
7214 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7216 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7217 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7218 * [String comparison is faster][faststr].
7219 * `&mut T` where `T: std::fmt::Write` [also implements
7220 `std::fmt::Write`][mutw].
7221 * [A stable regression in `VecDeque::push_back` and other
7222 capacity-altering methods that caused panics for zero-sized types
7224 * [Function pointers implement traits for up to 12 parameters][fp2].
7229 * The compiler [no longer uses the 'morestack' feature to prevent
7230 stack overflow][mm]. Instead it uses guard pages and stack
7231 probes (though stack probes are not yet implemented on any platform
7233 * [The compiler matches traits faster when projections are involved][p].
7234 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7236 * [Cargo now displays useful information about what its doing during
7237 `cargo update`][cu].
7239 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7240 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7241 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7242 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7243 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7244 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7245 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7246 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7247 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7248 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7249 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7250 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7251 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7252 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7253 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7254 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7255 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7256 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7257 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7258 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7259 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7260 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7261 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7262 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7263 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7264 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7265 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7266 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7267 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7268 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7269 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7270 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7271 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7272 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7273 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7274 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7275 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7276 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7277 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7278 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7279 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7280 [bh2]: https://github.com/rust-lang/rust/pull/28156
7281 [binfat]: https://github.com/rust-lang/rust/pull/28270
7282 [bm]: https://github.com/rust-lang/rust/pull/28197
7283 [cc]: https://github.com/rust-lang/rust/pull/27531
7284 [crlf]: https://github.com/rust-lang/rust/pull/28034
7285 [cu]: https://github.com/rust-lang/cargo/pull/1931
7286 [d]: https://github.com/rust-lang/rust/pull/27825
7287 [dep]: https://github.com/rust-lang/rust/pull/28339
7288 [es]: https://github.com/rust-lang/rust/pull/27956
7289 [ext]: https://github.com/rust-lang/rust/pull/28094
7290 [faststr]: https://github.com/rust-lang/rust/pull/28338
7291 [ffi]: https://github.com/rust-lang/rust/pull/28779
7292 [fp]: https://github.com/rust-lang/rust/pull/28268
7293 [fp2]: https://github.com/rust-lang/rust/pull/28560
7294 [fp3]: https://github.com/rust-lang/rust/pull/27307
7295 [i]: https://github.com/rust-lang/rust/pull/27451
7296 [into2]: https://github.com/rust-lang/rust/pull/28039
7297 [it]: https://github.com/rust-lang/rust/pull/27652
7298 [mm]: https://github.com/rust-lang/rust/pull/27338
7299 [mutw]: https://github.com/rust-lang/rust/pull/28368
7300 [sound]: https://github.com/rust-lang/rust/pull/27641
7301 [p]: https://github.com/rust-lang/rust/pull/27866
7302 [pec]: https://github.com/rust-lang/rust/pull/28486
7303 [pr]: https://github.com/rust-lang/rust/pull/27896
7304 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7305 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7306 [s]: https://github.com/rust-lang/rust/pull/27474
7307 [stab]: https://github.com/rust-lang/rust/pull/28339
7308 [stat]: https://github.com/rust-lang/rust/pull/28321
7309 [vd]: https://github.com/rust-lang/rust/pull/28494
7311 Version 1.3.0 (2015-09-17)
7312 ==============================
7314 * ~900 changes, numerous bugfixes
7319 * The [new object lifetime defaults][nold] have been [turned
7320 on][nold2] after a cycle of warnings about the change. Now types
7321 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7322 being interpreted as `&'a Box<Trait+'a>` to `&'a
7323 Box<Trait+'static>`.
7324 * [The Rustonomicon][nom] is a new book in the official documentation
7325 that dives into writing unsafe Rust.
7326 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7327 timekeeping is employed by other std APIs, as well as out-of-tree
7333 * The [new object lifetime defaults][nold] have been [turned
7334 on][nold2] after a cycle of warnings about the change.
7335 * There is a known [regression][lr] in how object lifetime elision is
7336 interpreted, the proper solution for which is undetermined.
7337 * The `#[prelude_import]` attribute, an internal implementation
7338 detail, was accidentally stabilized previously. [It has been put
7339 behind the `prelude_import` feature gate][pi]. This change is
7340 believed to break no existing code.
7341 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7342 [more sane for dynamically sized types][dst3]. Code that relied on
7343 the previous behavior is thought to be broken.
7344 * The `dropck` rules, which checks that destructors can't access
7345 destroyed values, [have been updated][dropck] to match the
7346 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7347 cause some previously-compiling code to no longer build.
7352 * The [new object lifetime defaults][nold] have been [turned
7353 on][nold2] after a cycle of warnings about the change.
7354 * Semicolons may [now follow types and paths in
7355 macros](https://github.com/rust-lang/rust/pull/27000).
7356 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7357 [more sane for dynamically sized types][dst3]. Code that relied on
7358 the previous behavior is not known to exist, and suspected to be
7360 * `'static` variables [may now be recursive][st].
7361 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7362 implementations correctly.
7363 * The `dropck` rules, which checks that destructors can't access
7364 destroyed values, [have been updated][dropck] to match the
7370 * The [`Duration`] API, [has been stabilized][ds], as well as the
7371 `std::time` module, which presently contains only `Duration`.
7372 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7373 * The owned C string, [`CString`], implements [`Borrow`] and the
7374 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7375 these allow C strings to be borrowed and cloned in generic code.
7376 * [`CStr`] implements [`Debug`].
7377 * [`AtomicPtr`] implements [`Debug`].
7378 * [`Error`] trait objects [can be downcast to their concrete types][e]
7379 in many common configurations, using the [`is`], [`downcast`],
7380 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7382 * Searching for substrings now [employs the two-way algorithm][search]
7383 instead of doing a naive search. This gives major speedups to a
7384 number of methods, including [`contains`][sc], [`find`][sf],
7385 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7386 [`ends_with`][sew] are also faster.
7387 * The performance of `PartialEq` for slices is [much faster][ps].
7388 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7389 is overridden and optimized by the implementations for scalars.
7390 * The [`Hasher`] trait now has a number of specialized `write_*`
7391 methods for primitive types, for efficiency.
7392 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7393 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7394 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7395 of [`std::error::Error::cause`][iec] also delegates to the inner
7397 * [`process::Child`][pc] gained the [`id`] method, which returns a
7398 `u32` representing the platform-specific process identifier.
7399 * The [`connect`] method on slices is deprecated, replaced by the new
7400 [`join`] method (note that both of these are on the *unstable*
7401 [`SliceConcatExt`] trait, but through the magic of the prelude are
7402 available to stable code anyway).
7403 * The [`Div`] operator is implemented for [`Wrapping`] types.
7404 * [`DerefMut` is implemented for `String`][dms].
7405 * Performance of SipHash (the default hasher for `HashMap`) is
7406 [better for long data][sh].
7407 * [`AtomicPtr`] implements [`Send`].
7408 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7409 are now [specialized to use uninitialized buffers for increased
7411 * Lifetime parameters of foreign functions [are now resolved
7417 * Rust can now, with some coercion, [produce programs that run on
7418 Windows XP][xp], though XP is not considered a supported platform.
7419 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7420 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7421 recommended for use in 1.3, though should be fully-functional
7422 in the [64-bit 1.4 beta][b14].
7423 * On Fedora-based systems installation will [properly configure the
7424 dynamic linker][fl].
7425 * The compiler gained many new extended error descriptions, which can
7426 be accessed with the `--explain` flag.
7427 * The `dropck` pass, which checks that destructors can't access
7428 destroyed values, [has been rewritten][dropck]. This fixes some
7429 soundness holes, and as such will cause some previously-compiling
7430 code to no longer build.
7431 * `rustc` now uses [LLVM to write archive files where possible][ar].
7432 Eventually this will eliminate the compiler's dependency on the ar
7434 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7435 supported FreeBSD on x86_64).
7436 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7437 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7439 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7440 will kill the process instead of leaking][nlp].
7442 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7443 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7444 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7445 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7446 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7447 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7448 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7449 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7450 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7451 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7452 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7453 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7454 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7455 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7456 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7457 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7458 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7459 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7460 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7461 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7462 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7463 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7464 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7465 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7466 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7467 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7468 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7469 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7470 [ar]: https://github.com/rust-lang/rust/pull/26926
7471 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7472 [dms]: https://github.com/rust-lang/rust/pull/26241
7473 [dropck]: https://github.com/rust-lang/rust/pull/27261
7474 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7475 [ds]: https://github.com/rust-lang/rust/pull/26818
7476 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7477 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7478 [dst3]: https://github.com/rust-lang/rust/pull/27351
7479 [e]: https://github.com/rust-lang/rust/pull/24793
7480 [f]: https://github.com/rust-lang/rust/pull/26588
7481 [fb]: https://github.com/rust-lang/rust/pull/26959
7482 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7483 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7484 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7485 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7486 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7487 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7488 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7489 [lic]: https://github.com/rust-lang/rust/pull/26583
7490 [lnu]: https://github.com/rust-lang/rust/pull/27026
7491 [lr]: https://github.com/rust-lang/rust/issues/27248
7492 [lum]: https://github.com/rust-lang/rust/pull/26378
7493 [lur]: https://github.com/rust-lang/rust/pull/26783
7494 [nlp]: https://github.com/rust-lang/rust/pull/27176
7495 [nold2]: https://github.com/rust-lang/rust/pull/27045
7496 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7497 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7498 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7499 [pi]: https://github.com/rust-lang/rust/pull/26699
7500 [ps]: https://github.com/rust-lang/rust/pull/26884
7501 [rte]: https://github.com/rust-lang/rust/pull/26950
7502 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7503 [search]: https://github.com/rust-lang/rust/pull/26327
7504 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7505 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7506 [sh]: https://github.com/rust-lang/rust/pull/27280
7507 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7508 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7509 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7510 [st]: https://github.com/rust-lang/rust/pull/26630
7511 [win1]: https://github.com/rust-lang/rust/pull/26569
7512 [win2]: https://github.com/rust-lang/rust/pull/26741
7513 [win3]: https://github.com/rust-lang/rust/pull/26741
7514 [win4]: https://github.com/rust-lang/rust/pull/27210
7515 [xp]: https://github.com/rust-lang/rust/pull/26569
7517 Version 1.2.0 (2015-08-07)
7518 ==========================
7520 * ~1200 changes, numerous bugfixes
7525 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7526 like `Rc` to contain types without a fixed size, arrays and trait
7527 objects, finally enabling use of `Rc<[T]>` and completing the
7528 implementation of DST.
7529 * [Parallel codegen][parcodegen] is now working again, which can
7530 substantially speed up large builds in debug mode; It also gets
7531 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7532 jobs). It's not enabled by default, but will be "in the near
7533 future". It can be activated with the `-C codegen-units=N` flag to
7535 * This is the first release with [experimental support for linking
7536 with the MSVC linker and lib C on Windows (instead of using the GNU
7537 variants via MinGW)][win]. It is yet recommended only for the most
7538 intrepid Rustaceans.
7539 * Benchmark compilations are showing a 30% improvement in
7540 bootstrapping over 1.1.
7545 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7546 unicode case mapping, which is a previously-planned change in
7547 behavior and considered a bugfix.
7548 * [`mem::align_of`] now specifies [the *minimum alignment* for
7549 T][align], which is usually the alignment programs are interested
7550 in, and the same value reported by clang's
7551 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7553 * [The `#[packed]` attribute is no longer silently accepted by the
7554 compiler][packed]. This attribute did nothing and code that
7555 mentioned it likely did not work as intended.
7556 * Associated type defaults are [now behind the
7557 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7558 defaults *did not work*, but could be mentioned syntactically. As
7559 such this breakage has minimal impact.
7564 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7565 matching against dereferenceable values.
7570 * The [`Extend`] trait, which grows a collection from an iterator, is
7571 implemented over iterators of references, for `String`, `Vec`,
7572 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7573 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7574 * The [`iter::once`] function returns an iterator that yields a single
7575 element, and [`iter::empty`] returns an iterator that yields no
7577 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7578 over substring matches.
7579 * [`Cell`] and [`RefCell`] both implement `Eq`.
7580 * A number of methods for wrapping arithmetic are added to the
7581 integral types, [`wrapping_div`], [`wrapping_rem`],
7582 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7583 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7584 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7585 type.. It is illegal for the default arithmetic operations in Rust
7586 to overflow; the desire to wrap must be explicit.
7587 * The `{:#?}` formatting specifier [displays the alternate,
7588 pretty-printed][debugfmt] form of the `Debug` formatter. This
7589 feature was actually introduced prior to 1.0 with little
7591 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7592 for writing data to formatted strings, similar to [`io::Write`].
7593 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7594 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7595 are used by code generators to emit implementations of [`Debug`].
7596 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7597 methods that convert case, following Unicode case mapping.
7598 * It is now easier to handle poisoned locks. The [`PoisonError`]
7599 type, returned by failing lock operations, exposes `into_inner`,
7600 `get_ref`, and `get_mut`, which all give access to the inner lock
7601 guard, and allow the poisoned lock to continue to operate. The
7602 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7603 poisoned lock without attempting to take the lock.
7604 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7605 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7606 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7607 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7609 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7615 * `rustc` employs smarter heuristics for guessing at [typos].
7616 * `rustc` emits more efficient code for [no-op conversions between
7617 unsafe pointers][nop].
7618 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7619 resulting in faster compile times and smaller code.
7621 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7622 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7623 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7624 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7625 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7626 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7627 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7628 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7629 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7630 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7631 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7632 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7633 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7634 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7635 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7636 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7637 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7638 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7639 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7640 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7641 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7642 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7643 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7644 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7645 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7646 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7647 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7648 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7649 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7650 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7651 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7652 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7653 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7654 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7655 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7656 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7657 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7658 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7659 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7660 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7661 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7662 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7663 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7664 [align]: https://github.com/rust-lang/rust/pull/25646
7665 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7666 [typos]: https://github.com/rust-lang/rust/pull/26087
7667 [nop]: https://github.com/rust-lang/rust/pull/26336
7668 [fat]: https://github.com/rust-lang/rust/pull/26411
7669 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7670 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7671 [packed]: https://github.com/rust-lang/rust/pull/25541
7672 [ad]: https://github.com/rust-lang/rust/pull/27382
7673 [win]: https://github.com/rust-lang/rust/pull/25350
7675 Version 1.1.0 (2015-06-25)
7676 =========================
7678 * ~850 changes, numerous bugfixes
7683 * The [`std::fs` module has been expanded][fs] to expand the set of
7684 functionality exposed:
7685 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7686 don't incur a syscall on some platforms.
7687 * A `symlink_metadata` function has been added.
7688 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7689 access to all underlying information.
7690 * The compiler now contains extended explanations of many errors. When an error
7691 with an explanation occurs the compiler suggests using the `--explain` flag
7692 to read the explanation. Error explanations are also [available online][err-index].
7693 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7694 well as other work, the time to bootstrap the compiler decreased by
7700 * The [`str::split_whitespace`] method splits a string on unicode
7701 whitespace boundaries.
7702 * On both Windows and Unix, new extension traits provide conversion of
7703 I/O types to and from the underlying system handles. On Unix, these
7704 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7705 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7706 `TcpListener`, and `UpdSocket`. Further implementations for
7707 `std::process` will be stabilized later.
7708 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7709 Windows, symlinks can be created with
7710 `std::os::windows::symlink_dir` and
7711 `std::os::windows::symlink_file`.
7712 * The `mpsc::Receiver` type can now be converted into an iterator with
7713 `into_iter` on the [`IntoIterator`] trait.
7714 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7715 implementation of the [`From`] trait.
7716 * The `Debug` implementation for `RangeFull` [creates output that is
7717 more consistent with other implementations][rf].
7718 * [`Debug` is implemented for `File`][file].
7719 * The `Default` implementation for `Arc` [no longer requires `Sync +
7721 * [The `Iterator` methods `count`, `nth`, and `last` have been
7722 overridden for slices to have O(1) performance instead of O(n)][si].
7723 * Incorrect handling of paths on Windows has been improved in both the
7724 compiler and the standard library.
7725 * [`AtomicPtr` gained a `Default` implementation][ap].
7726 * In accordance with Rust's policy on arithmetic overflow `abs` now
7727 [panics on overflow when debug assertions are enabled][abs].
7728 * The [`Cloned`] iterator, which was accidentally left unstable for
7729 1.0 [has been stabilized][c].
7730 * The [`Incoming`] iterator, which iterates over incoming TCP
7731 connections, and which was accidentally unnamable in 1.0, [is now
7732 properly exported][inc].
7733 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7734 `sift_up` or `sift_down` panic][bh].
7735 * The [`split_off`] method of `LinkedList` [no longer corrupts
7736 the list in certain scenarios][ll].
7741 * Type checking performance [has improved notably][sk] with
7742 [multiple improvements][pre].
7743 * The compiler [suggests code changes][ch] for more errors.
7744 * rustc and it's build system have experimental support for [building
7745 toolchains against MUSL][m] instead of glibc on Linux.
7746 * The compiler defines the `target_env` cfg value, which is used for
7747 distinguishing toolchains that are otherwise for the same
7748 platform. Presently this is set to `gnu` for common GNU Linux
7749 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7750 * The [`cargo rustc`][crc] command invokes a build with custom flags
7752 * [Android executables are always position independent][pie].
7753 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7756 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7757 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7758 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7759 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7760 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7761 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7762 [rf]: https://github.com/rust-lang/rust/pull/24491
7763 [err-index]: https://doc.rust-lang.org/error-index.html
7764 [sk]: https://github.com/rust-lang/rust/pull/24615
7765 [pre]: https://github.com/rust-lang/rust/pull/25323
7766 [file]: https://github.com/rust-lang/rust/pull/24598
7767 [ch]: https://github.com/rust-lang/rust/pull/24683
7768 [arc]: https://github.com/rust-lang/rust/pull/24695
7769 [si]: https://github.com/rust-lang/rust/pull/24701
7770 [ap]: https://github.com/rust-lang/rust/pull/24834
7771 [m]: https://github.com/rust-lang/rust/pull/24777
7772 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7773 [crc]: https://github.com/rust-lang/cargo/pull/1568
7774 [pie]: https://github.com/rust-lang/rust/pull/24953
7775 [abs]: https://github.com/rust-lang/rust/pull/25441
7776 [c]: https://github.com/rust-lang/rust/pull/25496
7777 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7778 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7779 [inc]: https://github.com/rust-lang/rust/pull/25522
7780 [bh]: https://github.com/rust-lang/rust/pull/25856
7781 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7782 [ll]: https://github.com/rust-lang/rust/pull/26022
7783 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7784 [drop]: https://github.com/rust-lang/rust/pull/24935
7786 Version 1.0.0 (2015-05-15)
7787 ========================
7789 * ~1500 changes, numerous bugfixes
7794 * The vast majority of the standard library is now `#[stable]`. It is
7795 no longer possible to use unstable features with a stable build of
7797 * Many popular crates on [crates.io] now work on the stable release
7799 * Arithmetic on basic integer types now [checks for overflow in debug
7805 * Several [restrictions have been added to trait coherence][coh] in
7806 order to make it easier for upstream authors to change traits
7807 without breaking downstream code.
7808 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7809 improve error messages and macro behavior. For example, `0b1234` is
7810 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7811 * Trait bounds [are always invariant][inv], eliminating the need for
7812 the `PhantomFn` and `MarkerTrait` lang items, which have been
7814 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7815 "foo" as bar` syntax has been replaced with `extern crate foo as
7816 bar`, and Cargo now automatically translates "-" in *package* names
7817 to underscore for the crate name.
7818 * [Lifetime shadowing is an error][lt].
7819 * [`Send` no longer implies `'static`][send-rfc].
7820 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7821 `MyType::default()`.
7822 * Primitive types [now have inherent methods][prim-inherent],
7823 obviating the need for extension traits like `SliceExt`.
7824 * Methods with `Self: Sized` in their `where` clause are [considered
7825 object-safe][self-sized], allowing many extension traits like
7826 `IteratorExt` to be merged into the traits they extended.
7827 * You can now [refer to associated types][assoc-where] whose
7828 corresponding trait bounds appear only in a `where` clause.
7829 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7830 like `Send` and `Sync` are now library-defined.
7831 * A [Reflect trait][reflect] was introduced, which means that
7832 downcasting via the `Any` trait is effectively limited to concrete
7833 types. This helps retain the potentially-important "parametricity"
7834 property: generic code cannot behave differently for different type
7835 arguments except in minor ways.
7836 * The `unsafe_destructor` feature is now deprecated in favor of the
7837 [new `dropck`][dropck]. This change is a major reduction in unsafe
7843 * The `thread_local` module [has been renamed to `std::thread`][th].
7844 * The methods of `IteratorExt` [have been moved to the `Iterator`
7846 * Several traits that implement Rust's conventions for type
7847 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7848 [centralized in the `std::convert` module][con].
7849 * The `FromError` trait [was removed in favor of `From`][fe].
7850 * The basic sleep function [has moved to
7851 `std::thread::sleep_ms`][slp].
7852 * The `splitn` function now takes an `n` parameter that represents the
7853 number of items yielded by the returned iterator [instead of the
7854 number of 'splits'][spl].
7855 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7856 * [Derived implementations of `PartialOrd` now order enums according
7857 to their explicitly-assigned discriminants][po].
7858 * [Methods for searching strings are generic over `Pattern`s][pat],
7859 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7861 * [In method resolution, object methods are resolved before inherent
7863 * [`String::from_str` has been deprecated in favor of the `From` impl,
7864 `String::from`][sf].
7865 * [`io::Error` implements `Sync`][ios].
7866 * [The `words` method on `&str` has been replaced with
7867 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7869 * The new path and IO modules are complete and `#[stable]`. This
7870 was the major library focus for this cycle.
7871 * The path API was [revised][path-normalize] to normalize `.`,
7872 adjusting the tradeoffs in favor of the most common usage.
7873 * A large number of remaining APIs in `std` were also stabilized
7874 during this cycle; about 75% of the non-deprecated API surface
7876 * The new [string pattern API][string-pattern] landed, which makes
7877 the string slice API much more internally consistent and flexible.
7878 * A new set of [generic conversion traits][conversion] replaced
7879 many existing ad hoc traits.
7880 * Generic numeric traits were [completely removed][num-traits]. This
7881 was made possible thanks to inherent methods for primitive types,
7882 and the removal gives maximal flexibility for designing a numeric
7883 hierarchy in the future.
7884 * The `Fn` traits are now related via [inheritance][fn-inherit]
7885 and provide ergonomic [blanket implementations][fn-blanket].
7886 * The `Index` and `IndexMut` traits were changed to
7887 [take the index by value][index-value], enabling code like
7888 `hash_map["string"]` to work.
7889 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7890 `Copy` data is known to be `Clone` as well.
7895 * Many errors now have extended explanations that can be accessed with
7896 the `--explain` flag to `rustc`.
7897 * Many new examples have been added to the standard library
7899 * rustdoc has received a number of improvements focused on completion
7901 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7902 * Much headway was made on ecosystem-wide CI, making it possible
7903 to [compare builds for breakage][ci-compare].
7906 [crates.io]: http://crates.io
7907 [clo]: https://github.com/rust-lang/rust/pull/24034
7908 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7909 [con]: https://github.com/rust-lang/rust/pull/23875
7910 [cr]: https://github.com/rust-lang/rust/pull/23419
7911 [fe]: https://github.com/rust-lang/rust/pull/23879
7912 [ie]: https://github.com/rust-lang/rust/pull/23300
7913 [inv]: https://github.com/rust-lang/rust/pull/23938
7914 [ios]: https://github.com/rust-lang/rust/pull/24133
7915 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7916 [lt]: https://github.com/rust-lang/rust/pull/24057
7917 [meth]: https://github.com/rust-lang/rust/pull/24056
7918 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7919 [po]: https://github.com/rust-lang/rust/pull/24270
7920 [sf]: https://github.com/rust-lang/rust/pull/24517
7921 [slp]: https://github.com/rust-lang/rust/pull/23949
7922 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7923 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7924 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7925 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7926 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7927 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7928 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7929 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7930 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7931 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7932 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7933 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7934 [reflect]: https://github.com/rust-lang/rust/pull/23712
7935 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7936 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7937 [index-value]: https://github.com/rust-lang/rust/pull/23601
7938 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7939 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7940 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7941 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7942 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7943 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7946 Version 1.0.0-alpha.2 (2015-02-20)
7947 =====================================
7949 * ~1300 changes, numerous bugfixes
7953 * The various I/O modules were [overhauled][io-rfc] to reduce
7954 unnecessary abstractions and provide better interoperation with
7955 the underlying platform. The old `io` module remains temporarily
7957 * The standard library now [participates in feature gating][feat],
7958 so use of unstable libraries now requires a `#![feature(...)]`
7959 attribute. The impact of this change is [described on the
7960 forum][feat-forum]. [RFC][feat-rfc].
7964 * `for` loops [now operate on the `IntoIterator` trait][into],
7965 which eliminates the need to call `.iter()`, etc. to iterate
7966 over collections. There are some new subtleties to remember
7967 though regarding what sort of iterators various types yield, in
7968 particular that `for foo in bar { }` yields values from a move
7969 iterator, destroying the original collection. [RFC][into-rfc].
7970 * Objects now have [default lifetime bounds][obj], so you don't
7971 have to write `Box<Trait+'static>` when you don't care about
7972 storing references. [RFC][obj-rfc].
7973 * In types that implement `Drop`, [lifetimes must outlive the
7974 value][drop]. This will soon make it possible to safely
7975 implement `Drop` for types where `#[unsafe_destructor]` is now
7976 required. Read the [gorgeous RFC][drop-rfc] for details.
7977 * The fully qualified <T as Trait>::X syntax lets you set the Self
7978 type for a trait method or associated type. [RFC][ufcs-rfc].
7979 * References to types that implement `Deref<U>` now [automatically
7980 coerce to references][deref] to the dereferenced type `U`,
7981 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7982 should eliminate many unsightly uses of `&*`, as when converting
7983 from references to vectors into references to
7984 slices. [RFC][deref-rfc].
7985 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7986 `|:|`) is obsolete and closure kind is inferred from context.
7987 * [`Self` is a keyword][Self].
7991 * The `Show` and `String` formatting traits [have been
7992 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7993 their related purposes. Automatically getting a string
7994 conversion to use with `format!("{:?}", something_to_debug)` is
7995 now written `#[derive(Debug)]`.
7996 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7997 OsStr}`, provide strings in platform-specific encodings for easier
7998 interop with system APIs. [RFC][osstr-rfc].
7999 * The `boxed::into_raw` and `Box::from_raw` functions [convert
8000 between `Box<T>` and `*mut T`][boxraw], a common pattern for
8001 creating raw pointers.
8005 * Certain long error messages of the form 'expected foo found bar'
8006 are now [split neatly across multiple
8007 lines][multiline]. Examples in the PR.
8008 * On Unix Rust can be [uninstalled][un] by running
8009 `/usr/local/lib/rustlib/uninstall.sh`.
8010 * The `#[rustc_on_unimplemented]` attribute, requiring the
8011 'on_unimplemented' feature, lets rustc [display custom error
8012 messages when a trait is expected to be implemented for a type
8017 * Rust is tested against a [LALR grammar][lalr], which parses
8018 almost all the Rust files that rustc does.
8020 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8021 [close]: https://github.com/rust-lang/rust/pull/21843
8022 [deref]: https://github.com/rust-lang/rust/pull/21351
8023 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8024 [drop]: https://github.com/rust-lang/rust/pull/21972
8025 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8026 [feat]: https://github.com/rust-lang/rust/pull/21248
8027 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8028 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8029 [fmt]: https://github.com/rust-lang/rust/pull/21457
8030 [into]: https://github.com/rust-lang/rust/pull/20790
8031 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8032 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8033 [lalr]: https://github.com/rust-lang/rust/pull/21452
8034 [multiline]: https://github.com/rust-lang/rust/pull/19870
8035 [obj]: https://github.com/rust-lang/rust/pull/22230
8036 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8037 [onun]: https://github.com/rust-lang/rust/pull/20889
8038 [osstr]: https://github.com/rust-lang/rust/pull/21488
8039 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8040 [Self]: https://github.com/rust-lang/rust/pull/22158
8041 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8042 [un]: https://github.com/rust-lang/rust/pull/22256
8045 Version 1.0.0-alpha (2015-01-09)
8046 ==================================
8048 * ~2400 changes, numerous bugfixes
8052 * The language itself is considered feature complete for 1.0,
8053 though there will be many usability improvements and bugfixes
8054 before the final release.
8055 * Nearly 50% of the public API surface of the standard library has
8056 been declared 'stable'. Those interfaces are unlikely to change
8058 * The long-running debate over integer types has been
8059 [settled][ints]: Rust will ship with types named `isize` and
8060 `usize`, rather than `int` and `uint`, for pointer-sized
8061 integers. Guidelines will be rolled out during the alpha cycle.
8062 * Most crates that are not `std` have been moved out of the Rust
8063 distribution into the Cargo ecosystem so they can evolve
8064 separately and don't need to be stabilized as quickly, including
8065 'time', 'getopts', 'num', 'regex', and 'term'.
8066 * Documentation continues to be expanded with more API coverage, more
8067 examples, and more in-depth explanations. The guides have been
8068 consolidated into [The Rust Programming Language][trpl].
8069 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8070 * All official Rust binary installers now come with [Cargo], the
8071 Rust package manager.
8075 * Closures have been [completely redesigned][unboxed] to be
8076 implemented in terms of traits, can now be used as generic type
8077 bounds and thus monomorphized and inlined, or via an opaque
8078 pointer (boxed) as in the old system. The new system is often
8079 referred to as 'unboxed' closures.
8080 * Traits now support [associated types][assoc], allowing families
8081 of related types to be defined together and used generically in
8083 * Enum variants are [namespaced by their type names][enum].
8084 * [`where` clauses][where] provide a more versatile and attractive
8085 syntax for specifying generic bounds, though the previous syntax
8087 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8089 * Rust [no longer has a runtime][rt] of any description, and only
8090 supports OS threads, not green threads.
8091 * At long last, Rust has been overhauled for 'dynamically-sized
8092 types' ([DST]), which integrates 'fat pointers' (object types,
8093 arrays, and `str`) more deeply into the type system, making it
8095 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8096 `..j` that produce range types and which, when combined with the
8097 `Index` operator and multidispatch, leads to a convenient slice
8099 * The new range syntax revealed an ambiguity in the fixed-length
8100 array syntax, so now fixed length arrays [are written `[T;
8102 * The `Copy` trait is no longer implemented automatically. Unsafe
8103 pointers no longer implement `Sync` and `Send` so types
8104 containing them don't automatically either. `Sync` and `Send`
8105 are now 'unsafe traits' so one can "forcibly" implement them via
8106 `unsafe impl` if a type confirms to the requirements for them
8107 even though the internals do not (e.g. structs containing unsafe
8108 pointers like `Arc`). These changes are intended to prevent some
8109 footguns and are collectively known as [opt-in built-in
8110 traits][oibit] (though `Sync` and `Send` will soon become pure
8111 library types unknown to the compiler).
8112 * Operator traits now take their operands [by value][ops], and
8113 comparison traits can use multidispatch to compare one type
8114 against multiple other types, allowing e.g. `String` to be
8115 compared with `&str`.
8116 * `if let` and `while let` are no longer feature-gated.
8117 * Rust has adopted a more [uniform syntax for escaping unicode
8118 characters][unicode].
8119 * `macro_rules!` [has been declared stable][mac]. Though it is a
8120 flawed system it is sufficiently popular that it must be usable
8121 for 1.0. Effort has gone into [future-proofing][mac-future] it
8122 in ways that will allow other macro systems to be developed in
8123 parallel, and won't otherwise impact the evolution of the
8125 * The prelude has been [pared back significantly][prelude] such
8126 that it is the minimum necessary to support the most pervasive
8127 code patterns, and through [generalized where clauses][where]
8128 many of the prelude extension traits have been consolidated.
8129 * Rust's rudimentary reflection [has been removed][refl], as it
8130 incurred too much code generation for little benefit.
8131 * [Struct variants][structvars] are no longer feature-gated.
8132 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8133 known as 'higher-ranked trait bounds', this crucially allows
8134 unboxed closures to work.
8135 * Macros invocations surrounded by parens or square brackets and
8136 not terminated by a semicolon are [parsed as
8137 expressions][macros], which makes expressions like `vec![1i32,
8138 2, 3].len()` work as expected.
8139 * Trait objects now implement their traits automatically, and
8140 traits that can be coerced to objects now must be [object
8142 * Automatically deriving traits is now done with `#[derive(...)]`
8143 not `#[deriving(...)]` for [consistency with other naming
8144 conventions][derive].
8145 * Importing the containing module or enum at the same time as
8146 items or variants they contain is [now done with `self` instead
8147 of `mod`][self], as in use `foo::{self, bar}`
8148 * Glob imports are no longer feature-gated.
8149 * The `box` operator and `box` patterns have been feature-gated
8150 pending a redesign. For now unique boxes should be allocated
8151 like other containers, with `Box::new`.
8155 * A [series][coll1] of [efforts][coll2] to establish
8156 [conventions][coll3] for collections types has resulted in API
8157 improvements throughout the standard library.
8158 * New [APIs for error handling][err] provide ergonomic interop
8159 between error types, and [new conventions][err-conv] describe
8160 more clearly the recommended error handling strategies in Rust.
8161 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8162 it is easier to discuss failure in the context of error handling
8163 without making clarifications as to whether you are referring to
8164 the 'fail' macro or failure more generally.
8165 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8166 syscall when available.
8167 * The 'serialize' crate has been renamed 'rustc-serialize' and
8168 moved out of the distribution to Cargo. Although it is widely
8169 used now, it is expected to be superseded in the near future.
8170 * The `Show` formatter, typically implemented with
8171 `#[derive(Show)]` is [now requested with the `{:?}`
8172 specifier][show] and is intended for use by all types, for uses
8173 such as `println!` debugging. The new `String` formatter must be
8174 implemented by hand, uses the `{}` specifier, and is intended
8175 for full-fidelity conversions of things that can logically be
8176 represented as strings.
8180 * [Flexible target specification][flex] allows rustc's code
8181 generation to be configured to support otherwise-unsupported
8183 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8184 respective debuggers with Rust-appropriate pretty-printing.
8185 * The Windows installation of Rust is distributed with the
8186 MinGW components currently required to link binaries on that
8191 * Nullable enum optimizations have been extended to more types so
8192 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8193 space than the inner types themselves.
8194 * Work has begun on supporting AArch64.
8196 [Cargo]: https://crates.io
8197 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8198 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8199 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8200 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8201 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8202 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8203 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8204 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8205 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8206 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8207 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8208 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8209 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8210 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8211 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8212 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8213 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8214 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8215 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8216 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8217 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8218 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8219 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8220 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8221 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8222 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8223 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8224 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8225 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8226 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8227 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8228 [trpl]: https://doc.rust-lang.org/book/index.html
8229 [rbe]: http://rustbyexample.com/
8232 Version 0.12.0 (2014-10-09)
8233 =============================
8235 * ~1900 changes, numerous bugfixes
8239 * The introductory documentation (now called The Rust Guide) has
8240 been completely rewritten, as have a number of supplementary
8242 * Rust's package manager, Cargo, continues to improve and is
8243 sometimes considered to be quite awesome.
8244 * Many API's in `std` have been reviewed and updated for
8245 consistency with the in-development Rust coding
8246 guidelines. The standard library documentation tracks
8247 stabilization progress.
8248 * Minor libraries have been moved out-of-tree to the rust-lang org
8249 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8250 be installed with Cargo.
8251 * Lifetime elision allows lifetime annotations to be left off of
8252 function declarations in many common scenarios.
8253 * Rust now works on 64-bit Windows.
8256 * Indexing can be overloaded with the `Index` and `IndexMut`
8258 * The `if let` construct takes a branch only if the `let` pattern
8259 matches, currently behind the 'if_let' feature gate.
8260 * 'where clauses', a more flexible syntax for specifying trait
8261 bounds that is more aesthetic, have been added for traits and
8262 free functions. Where clauses will in the future make it
8263 possible to constrain associated types, which would be
8264 impossible with the existing syntax.
8265 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8266 the 'slicing_syntax' feature gate, and can be overloaded with
8267 the `Slice` or `SliceMut` traits.
8268 * The syntax for matching of sub-slices has been changed to use a
8269 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8270 consistency with other uses of `..` and to future-proof
8271 potential additional uses of the syntax.
8272 * The syntax for matching inclusive ranges in patterns has changed
8273 from `0..3` to `0...4` to be consistent with the exclusive range
8275 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8276 c]`) has been put behind the 'advanced_slice_patterns' feature
8277 gate and may be removed in the future.
8278 * Components of tuples and tuple structs can be extracted using
8279 the `value.0` syntax, currently behind the `tuple_indexing`
8281 * The `#[crate_id]` attribute is no longer supported; versioning
8282 is handled by the package manager.
8283 * Renaming crate imports are now written `extern crate foo as bar`
8284 instead of `extern crate bar = foo`.
8285 * Renaming use statements are now written `use foo as bar` instead
8287 * `let` and `match` bindings and argument names in macros are now
8289 * The new, more efficient, closure types ('unboxed closures') have
8290 been added under a feature gate, 'unboxed_closures'. These will
8291 soon replace the existing closure types, once higher-ranked
8292 trait lifetimes are added to the language.
8293 * `move` has been added as a keyword, for indicating closures
8294 that capture by value.
8295 * Mutation and assignment is no longer allowed in pattern guards.
8296 * Generic structs and enums can now have trait bounds.
8297 * The `Share` trait is now called `Sync` to free up the term
8298 'shared' to refer to 'shared reference' (the default reference
8300 * Dynamically-sized types have been mostly implemented,
8301 unifying the behavior of fat-pointer types with the rest of the
8303 * As part of dynamically-sized types, the `Sized` trait has been
8304 introduced, which qualifying types implement by default, and
8305 which type parameters expect by default. To specify that a type
8306 parameter does not need to be sized, write `<Sized? T>`. Most
8307 types are `Sized`, notable exceptions being unsized arrays
8308 (`[T]`) and trait types.
8309 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8310 * Lifetime bounds can now be applied to type parameters and object
8312 * The old, reference counted GC type, `Gc<T>` which was once
8313 denoted by the `@` sigil, has finally been removed. GC will be
8314 revisited in the future.
8317 * Library documentation has been improved for a number of modules.
8318 * Bit-vectors, collections::bitv has been modernized.
8319 * The url crate is deprecated in favor of
8320 http://github.com/servo/rust-url, which can be installed with
8322 * Most I/O stream types can be cloned and subsequently closed from
8324 * A `std::time::Duration` type has been added for use in I/O
8325 methods that rely on timers, as well as in the 'time' crate's
8326 `Timespec` arithmetic.
8327 * The runtime I/O abstraction layer that enabled the green thread
8328 scheduler to do non-thread-blocking I/O has been removed, along
8329 with the libuv-based implementation employed by the green thread
8330 scheduler. This will greatly simplify the future I/O work.
8331 * `collections::btree` has been rewritten to have a more
8332 idiomatic and efficient design.
8335 * rustdoc output now indicates the stability levels of API's.
8336 * The `--crate-name` flag can specify the name of the crate
8337 being compiled, like `#[crate_name]`.
8338 * The `-C metadata` specifies additional metadata to hash into
8339 symbol names, and `-C extra-filename` specifies additional
8340 information to put into the output filename, for use by the
8341 package manager for versioning.
8342 * debug info generation has continued to improve and should be
8343 more reliable under both gdb and lldb.
8344 * rustc has experimental support for compiling in parallel
8345 using the `-C codegen-units` flag.
8346 * rustc no longer encodes rpath information into binaries by
8350 * Stack usage has been optimized with LLVM lifetime annotations.
8351 * Official Rust binaries on Linux are more compatible with older
8352 kernels and distributions, built on CentOS 5.10.
8355 Version 0.11.0 (2014-07-02)
8356 ==========================
8358 * ~1700 changes, numerous bugfixes
8361 * ~[T] has been removed from the language. This type is superseded by
8363 * ~str has been removed from the language. This type is superseded by
8365 * ~T has been removed from the language. This type is superseded by the
8367 * @T has been removed from the language. This type is superseded by the
8368 standard library's std::gc::Gc<T> type.
8369 * Struct fields are now all private by default.
8370 * Vector indices and shift amounts are both required to be a `uint`
8371 instead of any integral type.
8372 * Byte character, byte string, and raw byte string literals are now all
8373 supported by prefixing the normal literal with a `b`.
8374 * Multiple ABIs are no longer allowed in an ABI string
8375 * The syntax for lifetimes on closures/procedures has been tweaked
8376 slightly: `<'a>|A, B|: 'b + K -> T`
8377 * Floating point modulus has been removed from the language; however it
8378 is still provided by a library implementation.
8379 * Private enum variants are now disallowed.
8380 * The `priv` keyword has been removed from the language.
8381 * A closure can no longer be invoked through a &-pointer.
8382 * The `use foo, bar, baz;` syntax has been removed from the language.
8383 * The transmute intrinsic no longer works on type parameters.
8384 * Statics now allow blocks/items in their definition.
8385 * Trait bounds are separated from objects with + instead of : now.
8386 * Objects can no longer be read while they are mutably borrowed.
8387 * The address of a static is now marked as insignificant unless the
8388 #[inline(never)] attribute is placed it.
8389 * The #[unsafe_destructor] attribute is now behind a feature gate.
8390 * Struct literals are no longer allowed in ambiguous positions such as
8391 if, while, match, and for..in.
8392 * Declaration of lang items and intrinsics are now feature-gated by
8394 * Integral literals no longer default to `int`, and floating point
8395 literals no longer default to `f64`. Literals must be suffixed with an
8396 appropriate type if inference cannot determine the type of the
8398 * The Box<T> type is no longer implicitly borrowed to &mut T.
8399 * Procedures are now required to not capture borrowed references.
8402 * The standard library is now a "facade" over a number of underlying
8403 libraries. This means that development on the standard library should
8404 be speedier due to smaller crates, as well as a clearer line between
8406 * A new library, libcore, lives under the standard library's facade
8407 which is Rust's "0-assumption" library, suitable for embedded and
8408 kernel development for example.
8409 * A regex crate has been added to the standard distribution. This crate
8410 includes statically compiled regular expressions.
8411 * The unwrap/unwrap_err methods on Result require a Show bound for
8412 better error messages.
8413 * The return types of the std::comm primitives have been centralized
8414 around the Result type.
8415 * A number of I/O primitives have gained the ability to time out their
8417 * A number of I/O primitives have gained the ability to close their
8418 reading/writing halves to cancel pending operations.
8419 * Reverse iterator methods have been removed in favor of `rev()` on
8420 their forward-iteration counterparts.
8421 * A bitflags! macro has been added to enable easy interop with C and
8422 management of bit flags.
8423 * A debug_assert! macro is now provided which is disabled when
8424 `--cfg ndebug` is passed to the compiler.
8425 * A graphviz crate has been added for creating .dot files.
8426 * The std::cast module has been migrated into std::mem.
8427 * The std::local_data api has been migrated from freestanding functions
8428 to being based on methods.
8429 * The Pod trait has been renamed to Copy.
8430 * jemalloc has been added as the default allocator for types.
8431 * The API for allocating memory has been changed to use proper alignment
8432 and sized deallocation
8433 * Connecting a TcpStream or binding a TcpListener is now based on a
8434 string address and a u16 port. This allows connecting to a hostname as
8436 * The Reader trait now contains a core method, read_at_least(), which
8437 correctly handles many repeated 0-length reads.
8438 * The process-spawning API is now centered around a builder-style
8440 * The :? printing qualifier has been moved from the standard library to
8441 an external libdebug crate.
8442 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8443 have been renamed to Eq/Ord.
8444 * The select/plural methods have been removed from format!. The escapes
8445 for { and } have also changed from \{ and \} to {{ and }},
8447 * The TaskBuilder API has been re-worked to be a true builder, and
8448 extension traits for spawning native/green tasks have been added.
8451 * All breaking changes to the language or libraries now have their
8452 commit message annotated with `[breaking-change]` to allow for easy
8453 discovery of breaking changes.
8454 * The compiler will now try to suggest how to annotate lifetimes if a
8455 lifetime-related error occurs.
8456 * Debug info continues to be improved greatly with general bug fixes and
8457 better support for situations like link time optimization (LTO).
8458 * Usage of syntax extensions when cross-compiling has been fixed.
8459 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8460 -fdata-sections and --gc-sections has been enabled by default
8461 * The compiler is now stricter about where it will load module files
8462 from when a module is declared via `mod foo;`.
8463 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8464 Syntax extensions are now discovered via a "plugin registrar" type
8465 which will be extended in the future to other various plugins.
8466 * Lints have been restructured to allow for dynamically loadable lints.
8467 * A number of rustdoc improvements:
8468 * The HTML output has been visually redesigned.
8469 * Markdown is now powered by hoedown instead of sundown.
8470 * Searching heuristics have been greatly improved.
8471 * The search index has been reduced in size by a great amount.
8472 * Cross-crate documentation via `pub use` has been greatly improved.
8473 * Primitive types are now hyperlinked and documented.
8474 * Documentation has been moved from static.rust-lang.org/doc to
8476 * A new sandbox, play.rust-lang.org, is available for running and
8477 sharing rust code examples on-line.
8478 * Unused attributes are now more robustly warned about.
8479 * The dead_code lint now warns about unused struct fields.
8480 * Cross-compiling to iOS is now supported.
8481 * Cross-compiling to mipsel is now supported.
8482 * Stability attributes are now inherited by default and no longer apply
8483 to intra-crate usage, only inter-crate usage.
8484 * Error message related to non-exhaustive match expressions have been
8488 Version 0.10 (2014-04-03)
8489 =========================
8491 * ~1500 changes, numerous bugfixes
8494 * A new RFC process is now in place for modifying the language.
8495 * Patterns with `@`-pointers have been removed from the language.
8496 * Patterns with unique vectors (`~[T]`) have been removed from the
8498 * Patterns with unique strings (`~str`) have been removed from the
8500 * `@str` has been removed from the language.
8501 * `@[T]` has been removed from the language.
8502 * `@self` has been removed from the language.
8503 * `@Trait` has been removed from the language.
8504 * Headers on `~` allocations which contain `@` boxes inside the type for
8505 reference counting have been removed.
8506 * The semantics around the lifetimes of temporary expressions have changed,
8507 see #3511 and #11585 for more information.
8508 * Cross-crate syntax extensions are now possible, but feature gated. See
8509 #11151 for more information. This includes both `macro_rules!` macros as
8510 well as syntax extensions such as `format!`.
8511 * New lint modes have been added, and older ones have been turned on to be
8513 * Unnecessary parentheses
8516 * Uppercase variables
8517 * Publicly visible private types
8518 * `#[deriving]` with raw pointers
8519 * Unsafe functions can no longer be coerced to closures.
8520 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8521 * The `#[simd]` attribute is now behind a feature gate.
8522 * Visibility is no longer allowed on `extern crate` statements, and
8523 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8524 * Trailing commas are now allowed in argument lists and tuple patterns.
8525 * The `do` keyword has been removed, it is now a reserved keyword.
8526 * Default type parameters have been implemented, but are feature gated.
8527 * Borrowed variables through captures in closures are now considered soundly.
8528 * `extern mod` is now `extern crate`
8529 * The `Freeze` trait has been removed.
8530 * The `Share` trait has been added for types that can be shared among
8532 * Labels in macros are now hygienic.
8533 * Expression/statement macro invocations can be delimited with `{}` now.
8534 * Treatment of types allowed in `static mut` locations has been tweaked.
8535 * The `*` and `.` operators are now overloadable through the `Deref` and
8537 * `~Trait` and `proc` no longer have `Send` bounds by default.
8538 * Partial type hints are now supported with the `_` type marker.
8539 * An `Unsafe` type was introduced for interior mutability. It is now
8540 considered undefined to transmute from `&T` to `&mut T` without using the
8542 * The #[linkage] attribute was implemented for extern statics/functions.
8543 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8544 * `Pod` was renamed to `Copy`.
8547 * The `libextra` library has been removed. It has now been decomposed into
8548 component libraries with smaller and more focused nuggets of
8549 functionality. The full list of libraries can be found on the
8550 documentation index page.
8551 * std: `std::condition` has been removed. All I/O errors are now propagated
8552 through the `Result` type. In order to assist with error handling, a
8553 `try!` macro for unwrapping errors with an early return and a lint for
8554 unused results has been added. See #12039 for more information.
8555 * std: The `vec` module has been renamed to `slice`.
8556 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8557 This will become the only growable vector in the future.
8558 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8559 are now found at `std::io::BufferedReader` instead of
8560 `std::io::buffered::BufferedReader`.
8561 * std: `print` and `println` are no longer in the prelude, the `print!` and
8562 `println!` macros are intended to be used instead.
8563 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8564 attempts to statically prevent cycles.
8565 * std: The standard distribution is adopting the policy of pushing failure
8566 to the user rather than failing in libraries. Many functions (such as
8567 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8568 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8569 deriving mode: `#[deriving(Show)]`.
8570 * std: `ToStr` is now implemented for all types implementing `Show`.
8571 * std: The formatting trait methods now take `&self` instead of `&T`
8572 * std: The `invert()` method on iterators has been renamed to `rev()`
8573 * std: `std::num` has seen a reduction in the genericity of its traits,
8574 consolidating functionality into a few core traits.
8575 * std: Backtraces are now printed on task failure if the environment
8576 variable `RUST_BACKTRACE` is present.
8577 * std: Naming conventions for iterators have been standardized. More details
8578 can be found on the wiki's style guide.
8579 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8580 still implement the function.
8581 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8582 * std: `assert_approx_eq!` has been removed
8583 * std: The `e` and `E` formatting specifiers for floats have been added to
8584 print them in exponential notation.
8585 * std: The `Times` trait has been removed
8586 * std: Indications of variance and opting out of builtin bounds is done
8587 through marker types in `std::kinds::marker` now
8588 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8589 `#[deriving(Hash)]` is now possible.
8590 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8591 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8592 * std: `Chan::new` is now `channel()`.
8593 * std: A new synchronous channel type has been implemented.
8594 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8595 * std: `hashmap` and `trie` have been moved to `libcollections`
8596 * std: `run` has been rolled into `io::process`
8597 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8598 * std: The equality and comparison traits have seen some reorganization.
8599 * std: `rand` has moved to `librand`.
8600 * std: `to_{lower,upper}case` has been implemented for `char`.
8601 * std: Logging has been moved to `liblog`.
8602 * collections: `HashMap` has been rewritten for higher performance and less
8604 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8605 it can be booted manually. The runtime guide has more information and
8607 * native: All I/O functionality except signals has been implemented.
8608 * green: Task spawning with `libgreen` has been optimized with stack caching
8609 and various trimming of code.
8610 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8611 * sync: The `extra::sync` module has been updated to modern rust (and moved
8612 to the `sync` library), tweaking and improving various interfaces while
8613 dropping redundant functionality.
8614 * sync: A new `Barrier` type has been added to the `sync` library.
8615 * sync: An efficient mutex for native and green tasks has been implemented.
8616 * serialize: The `base64` module has seen some improvement. It treats
8617 newlines better, has non-string error values, and has seen general
8619 * fourcc: A `fourcc!` macro was introduced
8620 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8621 hexadecimal literal.
8624 * `rustpkg` has been deprecated and removed from the main repository. Its
8625 replacement, `cargo`, is under development.
8626 * Nightly builds of rust are now available
8627 * The memory usage of rustc has been improved many times throughout this
8629 * The build process supports disabling rpath support for the rustc binary
8631 * Code generation has improved in some cases, giving more information to the
8632 LLVM optimization passes to enable more extensive optimizations.
8633 * Debuginfo compatibility with lldb on OSX has been restored.
8634 * The master branch is now gated on an android bot, making building for
8635 android much more reliable.
8636 * Output flags have been centralized into one `--emit` flag.
8637 * Crate type flags have been centralized into one `--crate-type` flag.
8638 * Codegen flags have been consolidated behind a `-C` flag.
8639 * Linking against outdated crates now has improved error messages.
8640 * Error messages with lifetimes will often suggest how to annotate the
8641 function to fix the error.
8642 * Many more types are documented in the standard library, and new guides
8644 * Many `rustdoc` improvements:
8645 * code blocks are syntax highlighted.
8646 * render standalone markdown files.
8647 * the --test flag tests all code blocks by default.
8648 * exported macros are displayed.
8649 * re-exported types have their documentation inlined at the location of the
8651 * search works across crates that have been rendered to the same output
8655 Version 0.9 (2014-01-09)
8656 ==========================
8658 * ~1800 changes, numerous bugfixes
8661 * The `float` type has been removed. Use `f32` or `f64` instead.
8662 * A new facility for enabling experimental features (feature gating) has
8663 been added, using the crate-level `#[feature(foo)]` attribute.
8664 * Managed boxes (@) are now behind a feature gate
8665 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8666 standard library's `Gc` or `Rc` types instead.
8667 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8668 * Jumping back to the top of a loop is now done with `continue` instead of
8670 * Strings can no longer be mutated through index assignment.
8671 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8672 hash delimiters, as in `r###"foo"###`.
8673 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8675 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8676 * `@fn`s have been removed.
8677 * `do` only works with procs in order to make it obvious what the cost
8679 * Single-element tuple-like structs can no longer be dereferenced to
8680 obtain the inner value. A more comprehensive solution for overloading
8681 the dereference operator will be provided in the future.
8682 * The `#[link(...)]` attribute has been replaced with
8683 `#[crate_id = "name#vers"]`.
8684 * Empty `impl`s must be terminated with empty braces and may not be
8685 terminated with a semicolon.
8686 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8687 no longer has any special meaning.
8688 * The old `fmt!` string formatting macro has been removed.
8689 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8690 `print!` and `println!`.
8691 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8692 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8693 `extern mod foo = "bar"` instead.
8694 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8695 * Macros can have attributes.
8696 * Macros can expand to items with attributes.
8697 * Macros can expand to multiple items.
8698 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8699 * Comments may be nested.
8700 * Values automatically coerce to trait objects they implement, without
8702 * Enum discriminants are no longer an entire word but as small as needed to
8703 contain all the variants. The `repr` attribute can be used to override
8704 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8705 `#[repr(C)]` to match C enums.
8706 * Non-string literals are not allowed in attributes (they never worked).
8707 * The FFI now supports variadic functions.
8708 * Octal numeric literals, as in `0o7777`.
8709 * The `concat!` syntax extension performs compile-time string concatenation.
8710 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8711 removed as Rust no longer uses segmented stacks.
8712 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8713 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8714 not `*`; ignoring remaining fields of a struct is also done with `..`,
8715 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8716 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8717 * `rustc` supports the "system" calling convention, which defaults to the
8718 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8720 * The `type_overflow` lint (default: warn) checks literals for overflow.
8721 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8722 * The `attribute_usage` lint (default: warn) warns about unknown
8724 * The `unknown_features` lint (default: warn) warns about unknown
8726 * The `dead_code` lint (default: warn) checks for dead code.
8727 * Rust libraries can be linked statically to one another
8728 * `#[link_args]` is behind the `link_args` feature gate.
8729 * Native libraries are now linked with `#[link(name = "foo")]`
8730 * Native libraries can be statically linked to a rust crate
8731 (`#[link(name = "foo", kind = "static")]`).
8732 * Native OS X frameworks are now officially supported
8733 (`#[link(name = "foo", kind = "framework")]`).
8734 * The `#[thread_local]` attribute creates thread-local (not task-local)
8735 variables. Currently behind the `thread_local` feature gate.
8736 * The `return` keyword may be used in closures.
8737 * Types that can be copied via a memcpy implement the `Pod` kind.
8738 * The `cfg` attribute can now be used on struct fields and enum variants.
8741 * std: The `option` and `result` API's have been overhauled to make them
8742 simpler, more consistent, and more composable.
8743 * std: The entire `std::io` module has been replaced with one that is
8744 more comprehensive and that properly interfaces with the underlying
8745 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8747 * std: `io::util` contains a number of useful implementations of
8748 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8749 `ZeroReader`, `TeeReader`.
8750 * std: The reference counted pointer type `extra::rc` moved into std.
8751 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8752 just a wrapper around it).
8753 * std: The `Either` type has been removed.
8754 * std: `fmt::Default` can be implemented for any type to provide default
8755 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8756 * std: The `rand` API continues to be tweaked.
8757 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8758 on failure in gdb, is now named `rust_fail`.
8759 * std: The `each_key` and `each_value` methods on `HashMap` have been
8760 replaced by the `keys` and `values` iterators.
8761 * std: Functions dealing with type size and alignment have moved from the
8762 `sys` module to the `mem` module.
8763 * std: The `path` module was written and API changed.
8764 * std: `str::from_utf8` has been changed to cast instead of allocate.
8765 * std: `starts_with` and `ends_with` methods added to vectors via the
8766 `ImmutableEqVector` trait, which is in the prelude.
8767 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8768 if the index is out of bounds.
8769 * std: Task failure no longer propagates between tasks, as the model was
8770 complex, expensive, and incompatible with thread-based tasks.
8771 * std: The `Any` type can be used for dynamic typing.
8772 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8774 * std: Methods that produce iterators generally do not have an `_iter`
8776 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8777 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8778 * std: `util::ignore` renamed to `prelude::drop`.
8779 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8781 * std: `vec::raw` has seen a lot of cleanup and API changes.
8782 * std: The standard library no longer includes any C++ code, and very
8783 minimal C, eliminating the dependency on libstdc++.
8784 * std: Runtime scheduling and I/O functionality has been factored out into
8785 extensible interfaces and is now implemented by two different crates:
8786 libnative, for native threading and I/O; and libgreen, for green threading
8787 and I/O. This paves the way for using the standard library in more limited
8788 embedded environments.
8789 * std: The `comm` module has been rewritten to be much faster, have a
8790 simpler, more consistent API, and to work for both native and green
8792 * std: All libuv dependencies have been moved into the rustuv crate.
8793 * native: New implementations of runtime scheduling on top of OS threads.
8794 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8796 * green: The green thread scheduler and message passing types are almost
8798 * extra: The `flatpipes` module had bitrotted and was removed.
8799 * extra: All crypto functions have been removed and Rust now has a policy of
8800 not reimplementing crypto in the standard library. In the future crypto
8801 will be provided by external crates with bindings to established libraries.
8802 * extra: `c_vec` has been modernized.
8803 * extra: The `sort` module has been removed. Use the `sort` method on
8807 * The `rust` and `rusti` commands have been removed, due to lack of
8809 * `rustdoc` was completely rewritten.
8810 * `rustdoc` can test code examples in documentation.
8811 * `rustpkg` can test packages with the argument, 'test'.
8812 * `rustpkg` supports arbitrary dependencies, including C libraries.
8813 * `rustc`'s support for generating debug info is improved again.
8814 * `rustc` has better error reporting for unbalanced delimiters.
8815 * `rustc`'s JIT support was removed due to bitrot.
8816 * Executables and static libraries can be built with LTO (-Z lto)
8817 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8821 Version 0.8 (2013-09-26)
8822 ============================
8824 * ~2200 changes, numerous bugfixes
8827 * The `for` loop syntax has changed to work with the `Iterator` trait.
8828 * At long last, unwinding works on Windows.
8829 * Default methods are ready for use.
8830 * Many trait inheritance bugs fixed.
8831 * Owned and borrowed trait objects work more reliably.
8832 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8833 * rustc can omit emission of code for the `debug!` macro if it is passed
8835 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8836 for foo.rs, then foo/mod.rs, and will generate an error when both are
8838 * Strings no longer contain trailing nulls. The new `std::c_str` module
8839 provides new mechanisms for converting to C strings.
8840 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8841 * The FFI has been overhauled such that foreign functions are called directly,
8842 instead of through a stack-switching wrapper.
8843 * Calling a foreign function must be done through a Rust function with the
8844 `#[fixed_stack_segment]` attribute.
8845 * The `externfn!` macro can be used to declare both a foreign function and
8846 a `#[fixed_stack_segment]` wrapper at once.
8847 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8848 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8849 * `priv` is disallowed everywhere except for struct fields and enum variants.
8850 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8851 * `ref` bindings in irrefutable patterns work correctly now.
8852 * `char` is now prevented from containing invalid code points.
8853 * Casting to `bool` is no longer allowed.
8854 * `\0` is now accepted as an escape in chars and strings.
8855 * `yield` is a reserved keyword.
8856 * `typeof` is a reserved keyword.
8857 * Crates may be imported by URL with `extern mod foo = "url";`.
8858 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8859 * Static vectors can be initialized with repeating elements,
8860 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8861 * Static structs can be initialized with functional record update,
8862 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8863 * `cfg!` can be used to conditionally execute code based on the crate
8864 configuration, similarly to `#[cfg(...)]`.
8865 * The `unnecessary_qualification` lint detects unneeded module
8866 prefixes (default: allow).
8867 * Arithmetic operations have been implemented on the SIMD types in
8868 `std::unstable::simd`.
8869 * Exchange allocation headers were removed, reducing memory usage.
8870 * `format!` implements a completely new, extensible, and higher-performance
8871 string formatting system. It will replace `fmt!`.
8872 * `print!` and `println!` write formatted strings (using the `format!`
8873 extension) to stdout.
8874 * `write!` and `writeln!` write formatted strings (using the `format!`
8875 extension) to the new Writers in `std::rt::io`.
8876 * The library section in which a function or static is placed may
8877 be specified with `#[link_section = "..."]`.
8878 * The `proto!` syntax extension for defining bounded message protocols
8880 * `macro_rules!` is hygienic for `let` declarations.
8881 * The `#[export_name]` attribute specifies the name of a symbol.
8882 * `unreachable!` can be used to indicate unreachable code, and fails
8886 * std: Transitioned to the new runtime, written in Rust.
8887 * std: Added an experimental I/O library, `rt::io`, based on the new
8889 * std: A new generic `range` function was added to the prelude, replacing
8890 `uint::range` and friends.
8891 * std: `range_rev` no longer exists. Since range is an iterator it can be
8892 reversed with `range(lo, hi).invert()`.
8893 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8894 renamed to `unwrap_or`.
8895 * std: The `iterator` module was renamed to `iter`.
8896 * std: Integral types now support the `checked_add`, `checked_sub`, and
8897 `checked_mul` operations for detecting overflow.
8898 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8900 * std: Methods are standardizing on conventions for casting methods:
8901 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8903 * std: The `CString` type in `c_str` provides new ways to convert to and
8905 * std: `DoubleEndedIterator` can yield elements in two directions.
8906 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8908 * std: `str::from_bytes` renamed to `str::from_utf8`.
8909 * std: `pop_opt` and `shift_opt` methods added to vectors.
8910 * std: The task-local data interface no longer uses @, and keys are
8911 no longer function pointers.
8912 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8913 * std: Added `SharedPort` to `comm`.
8914 * std: `Eq` has a default method for `ne`; only `eq` is required
8916 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8917 is required in implementations.
8918 * std: `is_utf8` performance is improved, impacting many string functions.
8919 * std: `os::MemoryMap` provides cross-platform mmap.
8920 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8921 are not 'in-bounds' are considered undefined.
8922 * std: Many freestanding functions in `vec` removed in favor of methods.
8923 * std: Many freestanding functions on scalar types removed in favor of
8925 * std: Many options to task builders were removed since they don't make
8926 sense in the new scheduler design.
8927 * std: More containers implement `FromIterator` so can be created by the
8929 * std: More complete atomic types in `unstable::atomics`.
8930 * std: `comm::PortSet` removed.
8931 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8932 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8933 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8934 default implementations.
8935 * std: Various `from_str` functions were removed in favor of a generic
8936 `from_str` which is available in the prelude.
8937 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8938 * extra: `dlist`, the doubly-linked list was modernized.
8939 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8940 * extra: Added `glob` module, replacing `std::os::glob`.
8941 * extra: `rope` was removed.
8942 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8943 * extra: `net`, and `timer` were removed. The experimental replacements
8944 are `std::rt::io::net` and `std::rt::io::timer`.
8945 * extra: Iterators implemented for `SmallIntMap`.
8946 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8947 * extra: `SmallIntSet` removed. Use `BitvSet`.
8948 * extra: Performance of JSON parsing greatly improved.
8949 * extra: `semver` updated to SemVer 2.0.0.
8950 * extra: `term` handles more terminals correctly.
8951 * extra: `dbg` module removed.
8952 * extra: `par` module removed.
8953 * extra: `future` was cleaned up, with some method renames.
8954 * extra: Most free functions in `getopts` were converted to methods.
8957 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8958 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8959 similarly to gcc's `--march` flag.
8960 * rustc's performance compiling small crates is much better.
8961 * rustpkg has received many improvements.
8962 * rustpkg supports git tags as package IDs.
8963 * rustpkg builds into target-specific directories so it can be used for
8965 * The number of concurrent test tasks is controlled by the environment
8966 variable RUST_TEST_TASKS.
8967 * The test harness can now report metrics for benchmarks.
8968 * All tools have man pages.
8969 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8970 * The runtime uses jemalloc for allocations.
8971 * Segmented stacks are temporarily disabled as part of the transition to
8972 the new runtime. Stack overflows are possible!
8973 * A new documentation backend, rustdoc_ng, is available for use. It is
8974 still invoked through the normal `rustdoc` command.
8977 Version 0.7 (2013-07-03)
8978 =======================
8980 * ~2000 changes, numerous bugfixes
8983 * `impl`s no longer accept a visibility qualifier. Put them on methods
8985 * The borrow checker has been rewritten with flow-sensitivity, fixing
8986 many bugs and inconveniences.
8987 * The `self` parameter no longer implicitly means `&'self self`,
8988 and can be explicitly marked with a lifetime.
8989 * Overloadable compound operators (`+=`, etc.) have been temporarily
8990 removed due to bugs.
8991 * The `for` loop protocol now requires `for`-iterators to return `bool`
8992 so they compose better.
8993 * The `Durable` trait is replaced with the `'static` bounds.
8994 * Trait default methods work more often.
8995 * Structs with the `#[packed]` attribute have byte alignment and
8996 no padding between fields.
8997 * Type parameters bound by `Copy` must now be copied explicitly with
8999 * It is now illegal to move out of a dereferenced unsafe pointer.
9000 * `Option<~T>` is now represented as a nullable pointer.
9001 * `@mut` does dynamic borrow checks correctly.
9002 * The `main` function is only detected at the topmost level of the crate.
9003 The `#[main]` attribute is still valid anywhere.
9004 * Struct fields may no longer be mutable. Use inherited mutability.
9005 * The `#[no_send]` attribute makes a type that would otherwise be
9007 * The `#[no_freeze]` attribute makes a type that would otherwise be
9009 * Unbounded recursion will abort the process after reaching the limit
9010 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9011 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9012 are never implicitly copyable.
9013 * `#[static_assert]` makes compile-time assertions about static bools.
9014 * At long last, 'argument modes' no longer exist.
9015 * The rarely used `use mod` statement no longer exists.
9018 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9020 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9021 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9023 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9024 and unsuffixed integer literals.
9027 * The `core` crate was renamed to `std`.
9028 * The `std` crate was renamed to `extra`.
9029 * More and improved documentation.
9030 * std: `iterator` module for external iterator objects.
9031 * Many old-style (internal, higher-order function) iterators replaced by
9032 implementations of `Iterator`.
9033 * std: Many old internal vector and string iterators,
9034 incl. `any`, `all`. removed.
9035 * std: The `finalize` method of `Drop` renamed to `drop`.
9036 * std: The `drop` method now takes `&mut self` instead of `&self`.
9037 * std: The prelude no longer re-exports any modules, only types and traits.
9038 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9039 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9040 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9041 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9042 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9043 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9044 * std: Many types implement `Clone`.
9045 * std: `path` type renamed to `Path`.
9046 * std: `mut` module and `Mut` type removed.
9047 * std: Many standalone functions removed in favor of methods and iterators
9048 in `vec`, `str`. In the future methods will also work as functions.
9049 * std: `reinterpret_cast` removed. Use `transmute`.
9050 * std: ascii string handling in `std::ascii`.
9051 * std: `Rand` is implemented for ~/@.
9052 * std: `run` module for spawning processes overhauled.
9053 * std: Various atomic types added to `unstable::atomic`.
9054 * std: Various types implement `Zero`.
9055 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9056 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9057 * std: Added `os::mkdir_recursive`.
9058 * std: Added `os::glob` function performs filesystems globs.
9059 * std: `FuzzyEq` renamed to `ApproxEq`.
9060 * std: `Map` now defines `pop` and `swap` methods.
9061 * std: `Cell` constructors converted to static methods.
9062 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9063 * extra: `flate` module moved from `std` to `extra`.
9064 * extra: `fileinput` module for iterating over a series of files.
9065 * extra: `Complex` number type and `complex` module.
9066 * extra: `Rational` number type and `rational` module.
9067 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9068 * extra: `term` uses terminfo now, is more correct.
9069 * extra: `arc` functions converted to methods.
9070 * extra: Implementation of fixed output size variations of SHA-2.
9073 * `unused_variables` lint mode for unused variables (default: warn).
9074 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9076 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9078 * `dead_assignment` lint mode for unread variables (default: warn).
9079 * `unnecessary_allocation` lint mode detects some heap allocations that are
9080 immediately borrowed so could be written without allocating (default: warn).
9081 * `missing_doc` lint mode (default: allow).
9082 * `unreachable_code` lint mode (default: warn).
9083 * The `rusti` command has been rewritten and a number of bugs addressed.
9084 * rustc outputs in color on more terminals.
9085 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9086 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9087 * Compiling with `-g` will make the binary record information about
9088 dynamic borrowcheck failures for debugging.
9089 * rustdoc has a nicer stylesheet.
9090 * Various improvements to rustdoc.
9091 * Improvements to rustpkg (see the detailed release notes).
9094 Version 0.6 (2013-04-03)
9095 ========================
9097 * ~2100 changes, numerous bugfixes
9100 * The self type parameter in traits is now spelled `Self`
9101 * The `self` parameter in trait and impl methods must now be explicitly
9102 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9103 * Static methods no longer require the `static` keyword and instead
9104 are distinguished by the lack of a `self` parameter
9105 * Replaced the `Durable` trait with the `'static` lifetime
9106 * The old closure type syntax with the trailing sigil has been
9107 removed in favor of the more consistent leading sigil
9108 * `super` is a keyword, and may be prefixed to paths
9109 * Trait bounds are separated with `+` instead of whitespace
9110 * Traits are implemented with `impl Trait for Type`
9111 instead of `impl Type: Trait`
9112 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9113 * The `export` keyword has finally been removed
9114 * The `move` keyword has been removed (see "Semantic changes")
9115 * The interior mutability qualifier on vectors, `[mut T]`, has been
9116 removed. Use `&mut [T]`, etc.
9117 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9118 * `fail` is no longer a keyword. Use `fail!()`
9119 * `assert` is no longer a keyword. Use `assert!()`
9120 * `log` is no longer a keyword. use `debug!`, etc.
9121 * 1-tuples may be represented as `(T,)`
9122 * Struct fields may no longer be `mut`. Use inherited mutability,
9123 `@mut T`, `core::mut` or `core::cell`
9124 * `extern mod { ... }` is no longer valid syntax for foreign
9125 function modules. Use extern blocks: `extern { ... }`
9126 * Newtype enums removed. Use tuple-structs.
9127 * Trait implementations no longer support visibility modifiers
9128 * Pattern matching over vectors improved and expanded
9129 * `const` renamed to `static` to correspond to lifetime name,
9130 and make room for future `static mut` unsafe mutable globals.
9131 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9132 * `Clone` implementations can be automatically generated with
9133 `#[deriving(Clone)]`
9134 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9135 instead of `foo as Bar`.
9136 * Fixed length vector types are now written as `[int, .. 3]`
9137 instead of `[int * 3]`.
9138 * Fixed length vector types can express the length as a constant
9139 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9142 * Types with owned pointers or custom destructors move by default,
9143 eliminating the `move` keyword
9144 * All foreign functions are considered unsafe
9145 * &mut is now unaliasable
9146 * Writes to borrowed @mut pointers are prevented dynamically
9148 * The name of the main function can be customized using #[main]
9149 * The default type of an inferred closure is &fn instead of @fn
9150 * `use` statements may no longer be "chained" - they cannot import
9151 identifiers imported by previous `use` statements
9152 * `use` statements are crate relative, importing from the "top"
9153 of the crate by default. Paths may be prefixed with `super::`
9154 or `self::` to change the search behavior.
9155 * Method visibility is inherited from the implementation declaration
9156 * Structural records have been removed
9157 * Many more types can be used in static items, including enums
9158 'static-lifetime pointers and vectors
9159 * Pattern matching over vectors improved and expanded
9160 * Typechecking of closure types has been overhauled to
9161 improve inference and eliminate unsoundness
9162 * Macros leave scope at the end of modules, unless that module is
9163 tagged with #[macro_escape]
9166 * Added big integers to `std::bigint`
9167 * Removed `core::oldcomm` module
9168 * Added pipe-based `core::comm` module
9169 * Numeric traits have been reorganized under `core::num`
9170 * `vec::slice` finally returns a slice
9171 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9172 * Containers reorganized around traits in `core::container`
9173 * `core::dvec` removed, `~[T]` is a drop-in replacement
9174 * `core::send_map` renamed to `core::hashmap`
9175 * `std::map` removed; replaced with `core::hashmap`
9176 * `std::treemap` reimplemented as an owned balanced tree
9177 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9178 * `core::trie` added as a fast ordered map for integer keys
9179 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9180 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9181 overload the comparison operators, whereas `TotalOrd` is used
9182 by certain container types
9185 * Replaced the 'cargo' package manager with 'rustpkg'
9186 * Added all-purpose 'rust' tool
9187 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9188 * rustc now *attempts* to offer spelling suggestions
9189 * Improved support for ARM and Android
9190 * Preliminary MIPS backend
9191 * Improved foreign function ABI implementation for x86, x86_64
9192 * Various memory usage improvements
9193 * Rust code may be embedded in foreign code under limited circumstances
9194 * Inline assembler supported by new asm!() syntax extension.
9197 Version 0.5 (2012-12-21)
9198 ===========================
9200 * ~900 changes, numerous bugfixes
9203 * Removed `<-` move operator
9204 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9205 * Removed old fixed length vector syntax - `[T]/N`
9206 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9207 * Macros may now expand to items and statements
9208 * `a.b()` is always parsed as a method call, never as a field projection
9209 * `Eq` and `IterBytes` implementations can be automatically generated
9210 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9211 * Removed the special crate language for `.rc` files
9212 * Function arguments may consist of any irrefutable pattern
9215 * `&` and `~` pointers may point to objects
9216 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9217 * Enum variants may be structs
9218 * Destructors can be added to all nominal types with the Drop trait
9219 * Structs and nullary enum variants may be constants
9220 * Values that cannot be implicitly copied are now automatically moved
9221 without writing `move` explicitly
9222 * `&T` may now be coerced to `*T`
9223 * Coercions happen in `let` statements as well as function calls
9224 * `use` statements now take crate-relative paths
9225 * The module and type namespaces have been merged so that static
9226 method names can be resolved under the trait in which they are
9229 * Improved support for language features
9230 * Trait inheritance works in many scenarios
9231 * More support for explicit self arguments in methods - `self`, `&self`
9232 `@self`, and `~self` all generally work as expected
9233 * Static methods work in more situations
9234 * Experimental: Traits may declare default methods for the implementations
9238 * New condition handling system in `core::condition`
9239 * Timsort added to `std::sort`
9240 * New priority queue, `std::priority_queue`
9241 * Pipes for serializable types, `std::flatpipes'
9242 * Serialization overhauled to be trait-based
9243 * Expanded `getopts` definitions
9244 * Moved futures to `std`
9245 * More functions are pure now
9246 * `core::comm` renamed to `oldcomm`. Still deprecated
9247 * `rustdoc` and `cargo` are libraries now
9250 * Added a preliminary REPL, `rusti`
9251 * License changed from MIT to dual MIT/APL2
9254 Version 0.4 (2012-10-15)
9255 ==========================
9257 * ~2000 changes, numerous bugfixes
9260 * All keywords are now strict and may not be used as identifiers anywhere
9261 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9262 'of', 'with', 'to', 'class'.
9263 * Classes are replaced with simpler structs
9264 * Explicit method self types
9265 * `ret` became `return` and `alt` became `match`
9266 * `import` is now `use`; `use is now `extern mod`
9267 * `extern mod { ... }` is now `extern { ... }`
9268 * `use mod` is the recommended way to import modules
9269 * `pub` and `priv` replace deprecated export lists
9270 * The syntax of `match` pattern arms now uses fat arrow (=>)
9271 * `main` no longer accepts an args vector; use `os::args` instead
9274 * Trait implementations are now coherent, ala Haskell typeclasses
9275 * Trait methods may be static
9276 * Argument modes are deprecated
9277 * Borrowed pointers are much more mature and recommended for use
9278 * Strings and vectors in the static region are stored in constant memory
9279 * Typestate was removed
9280 * Resolution rewritten to be more reliable
9281 * Support for 'dual-mode' data structures (freezing and thawing)
9284 * Most binary operators can now be overloaded via the traits in
9286 * `std::net::url` for representing URLs
9287 * Sendable hash maps in `core::send_map`
9288 * `core::task' gained a (currently unsafe) task-local storage API
9291 * An efficient new intertask communication primitive called the pipe,
9292 along with a number of higher-level channel types, in `core::pipes`
9293 * `std::arc`, an atomically reference counted, immutable, shared memory
9295 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9296 * Futures are now based on pipes and sendable
9297 * More robust linked task failure
9298 * Improved task builder API
9301 * Improved error reporting
9302 * Preliminary JIT support
9303 * Preliminary work on precise GC
9304 * Extensive architectural improvements to rustc
9305 * Begun a transition away from buggy C++-based reflection (shape) code to
9306 Rust-based (visitor) code
9307 * All hash functions and tables converted to secure, randomized SipHash
9310 Version 0.3 (2012-07-12)
9311 ========================
9313 * ~1900 changes, numerous bugfixes
9315 * New coding conveniences
9316 * Integer-literal suffix inference
9317 * Per-item control over warnings, errors
9318 * #[cfg(windows)] and #[cfg(unix)] attributes
9319 * Documentation comments
9320 * More compact closure syntax
9321 * 'do' expressions for treating higher-order functions as
9323 * *-patterns (wildcard extended to all constructor fields)
9326 * Name resolution pass and exhaustiveness checker rewritten
9327 * Region pointers and borrow checking supersede alias
9329 * Init-ness checking is now provided by a region-based liveness
9330 pass instead of the typestate pass; same for last-use analysis
9331 * Extensive work on region pointers
9333 * Experimental new language features
9334 * Slices and fixed-size, interior-allocated vectors
9335 * #!-comments for lang versioning, shell execution
9336 * Destructors and iface implementation for classes;
9337 type-parameterized classes and class methods
9338 * 'const' type kind for types that can be used to implement
9339 shared-memory concurrency patterns
9343 * Removal of various obsolete features
9344 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9345 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9347 * Constructs: do-while loops ('do' repurposed), fn binding,
9348 resources (replaced by destructors)
9350 * Compiler reorganization
9351 * Syntax-layer of compiler split into separate crate
9352 * Clang (from LLVM project) integrated into build
9353 * Typechecker split into sub-modules
9356 * New time functions
9357 * Extension methods for many built-in types
9358 * Arc: atomic-refcount read-only / exclusive-use shared cells
9359 * Par: parallel map and search routines
9360 * Extensive work on libuv interface
9361 * Much vector code moved to libraries
9362 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9363 #include, #include_str, #include_bin
9366 * Cargo automatically resolves dependencies
9369 Version 0.2 (2012-03-29)
9370 =========================
9372 * >1500 changes, numerous bugfixes
9374 * New docs and doc tooling
9376 * New port: FreeBSD x86_64
9378 * Compilation model enhancements
9379 * Generics now specialized, multiply instantiated
9380 * Functions now inlined across separate crates
9382 * Scheduling, stack and threading fixes
9383 * Noticeably improved message-passing performance
9384 * Explicit schedulers
9388 * Experimental new language features
9389 * Operator overloading
9393 * Various language extensions
9394 * C-callback function types: 'crust fn ...'
9395 * Infinite-loop construct: 'loop { ... }'
9396 * Shorten 'mutable' to 'mut'
9397 * Required mutable-local qualifier: 'let mut ...'
9398 * Basic glob-exporting: 'export foo::*;'
9399 * Alt now exhaustive, 'alt check' for runtime-checked
9400 * Block-function form of 'for' loop, with 'break' and 'ret'.
9403 * AST quasi-quote syntax extension
9404 * Revived libuv interface
9405 * New modules: core::{future, iter}, std::arena
9406 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9407 * Extensive cleanup, regularization in libstd, libcore
9410 Version 0.1 (2012-01-20)
9411 ===============================
9413 * Most language features work, including:
9414 * Unique pointers, unique closures, move semantics
9415 * Interface-constrained generics
9416 * Static interface dispatch
9418 * Multithread task scheduling
9419 * Typestate predicates
9420 * Failure unwinding, destructors
9421 * Pattern matching and destructuring assignment
9422 * Lightweight block-lambda syntax
9423 * Preliminary macro-by-example
9425 * Compiler works with the following configurations:
9426 * Linux: x86 and x86_64 hosts and targets
9427 * macOS: x86 and x86_64 hosts and targets
9428 * Windows: x86 hosts and targets
9430 * Cross compilation / multi-target configuration supported.
9432 * Preliminary API-documentation and package-management tools included.
9436 * Documentation is incomplete.
9438 * Performance is below intended target.
9440 * Standard library APIs are subject to extensive change, reorganization.
9442 * Language-level versioning is not yet operational - future code will