1 Version 1.48.0 (2020-11-19)
2 ==========================
7 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
8 is still rejected *semantically*, but can now be parsed by procedural macros.
12 - [Stabilised the `-C link-self-contained=<yes|no>`.][76158] This tells `rustc` whether to link
13 its own C runtime and libraries or to rely on a external linker to find them. (Supported only on
14 `windows-gnu`, `linux-musl`, and `wasi` platforms.)
15 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
16 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
18 \* Refer to Rust's [platform support page][forge-platform-support] for more
19 information on Rust's tiered platform support.
23 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
24 and `&Stderr`.][76275]
25 - [All arrays now implement `TryFrom<Vec<T>>`.][76310]
26 - [The `matches!` macro now supports having a trailing comma.][74880]
27 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
28 - [Nearly all of `Cell`'s panicking functions now use the `#[track_caller]`
33 - [`slice::as_ptr_range`]
34 - [`slice::as_mut_ptr_range`]
35 - [`VecDeque::make_contiguous`]
39 The following previously stable methods are now `const fn`'s:
47 - [`Ordering::reverse`]
55 - [You can now link to items in `rustdoc` using the intra-doc link
56 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
57 a link to `std::future`'s documentation. See ["Linking to items by
58 name"][intradoc-links] for more information.
59 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
60 when searching through `rustdoc`'s UI.][75740]
64 - [You can now use `rustup install <major>.<minor>` to specify installing the
65 latest available patch of the specified minor version of the toolchain.][76107] E.g.
66 `rustup install 1.45` would install `1.45.2`, and `1.46` would install `1.46.0`.
70 - [`const fn`s are now implicitly promoted to `const`.][75502] Meaning that it
71 will only warn if your code fails `const` evaluation, and not produce an error.
72 - [Associated type bindings on trait objects are now verified to meet the bounds
73 declared on the trait when checking that they implement the trait.][27675]
74 - [When trait bounds on associated types or opaque types are ambiguous, the
75 compiler no longer makes an arbitrary choice on which bound to use.][54121]
76 - [Fixed recursive nonterminals not being expanded in macros during
77 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
78 correctly handling recursive nonterminal tokens.
79 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
80 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
81 in places where they have no effect.][73461]
82 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
83 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
84 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
85 disallow zero-initialization].[71274]
89 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
90 You can continue building with `make` by setting `ninja=false` in
93 [27675]: https://github.com/rust-lang/rust/issues/27675/
94 [54121]: https://github.com/rust-lang/rust/issues/54121/
95 [71274]: https://github.com/rust-lang/rust/pull/71274/
96 [77386]: https://github.com/rust-lang/rust/pull/77386/
97 [77153]: https://github.com/rust-lang/rust/pull/77153/
98 [77055]: https://github.com/rust-lang/rust/pull/77055/
99 [76275]: https://github.com/rust-lang/rust/pull/76275/
100 [76310]: https://github.com/rust-lang/rust/pull/76310/
101 [76420]: https://github.com/rust-lang/rust/pull/76420/
102 [76107]: https://github.com/rust-lang/rust/pull/76107/
103 [76158]: https://github.com/rust-lang/rust/pull/76158/
104 [75857]: https://github.com/rust-lang/rust/pull/75857/
105 [75585]: https://github.com/rust-lang/rust/pull/75585/
106 [75740]: https://github.com/rust-lang/rust/pull/75740/
107 [75502]: https://github.com/rust-lang/rust/pull/75502/
108 [74880]: https://github.com/rust-lang/rust/pull/74880/
109 [74922]: https://github.com/rust-lang/rust/pull/74922/
110 [74430]: https://github.com/rust-lang/rust/pull/74430/
111 [74194]: https://github.com/rust-lang/rust/pull/74194/
112 [73461]: https://github.com/rust-lang/rust/pull/73461/
113 [73166]: https://github.com/rust-lang/rust/pull/73166/
114 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
115 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
116 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
117 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
118 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
119 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
120 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
121 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
122 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
123 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
124 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
125 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
126 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
127 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
130 Version 1.47.0 (2020-10-08)
131 ==========================
135 - [Closures will now warn when not used.][74869]
139 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
140 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
142 - [Upgraded to LLVM 11.][73526]
143 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
144 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
145 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
147 \* Refer to Rust's [platform support page][forge-platform-support] for more
148 information on Rust's tiered platform support.
152 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
153 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
154 those of length less than 33.][74060]
155 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
156 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
157 `PartialEq`, and `PartialOrd`.][73583]
162 - [`Range::is_empty`]
163 - [`RangeInclusive::is_empty`]
164 - [`Result::as_deref`]
165 - [`Result::as_deref_mut`]
167 - [`pointer::offset_from`]
171 The following previously stable APIs have now been made const.
173 - [The `new` method for all `NonZero` integers.][73858]
174 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
175 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
176 methods for all integers.][73858]
177 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
178 signed integers.][73858]
179 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
180 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
181 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
182 `is_ascii_control` methods for `char` and `u8`.][73858]
186 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
187 You can override this by setting the following in your `Cargo.toml`.
189 [profile.release.build-override]
192 - [`cargo-help` will now display man pages for commands rather just the
193 `--help` text.][cargo/8456]
194 - [`cargo-metadata` now emits a `test` field indicating if a target has
195 tests enabled.][cargo/8478]
196 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
197 - [`cargo-publish` will now use an alternative registry by default if it's the
198 only registry specified in `package.publish`.][cargo/8571]
202 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
203 type based search.][75366]
204 - [Added the Ayu theme to rustdoc.][71237]
208 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
209 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
210 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
211 help to preserve more span information.][73084] These changes may cause
212 compiliation errors if your macro was unhygenic or didn't correctly handle
214 - [Moved support for the CloudABI target to tier 3.][75568]
215 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
216 - [Added the `rustc-docs` component.][75560] This allows you to install
217 and read the documentation for the compiler internal APIs. (Currently only
218 available for `x86_64-unknown-linux-gnu`.)
222 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
224 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
225 [75048]: https://github.com/rust-lang/rust/pull/75048/
226 [74163]: https://github.com/rust-lang/rust/pull/74163/
227 [71237]: https://github.com/rust-lang/rust/pull/71237/
228 [74869]: https://github.com/rust-lang/rust/pull/74869/
229 [73858]: https://github.com/rust-lang/rust/pull/73858/
230 [75716]: https://github.com/rust-lang/rust/pull/75716/
231 [75908]: https://github.com/rust-lang/rust/pull/75908/
232 [75516]: https://github.com/rust-lang/rust/pull/75516/
233 [75560]: https://github.com/rust-lang/rust/pull/75560/
234 [75568]: https://github.com/rust-lang/rust/pull/75568/
235 [75366]: https://github.com/rust-lang/rust/pull/75366/
236 [75204]: https://github.com/rust-lang/rust/pull/75204/
237 [74650]: https://github.com/rust-lang/rust/pull/74650/
238 [74419]: https://github.com/rust-lang/rust/pull/74419/
239 [73964]: https://github.com/rust-lang/rust/pull/73964/
240 [74021]: https://github.com/rust-lang/rust/pull/74021/
241 [74060]: https://github.com/rust-lang/rust/pull/74060/
242 [73893]: https://github.com/rust-lang/rust/pull/73893/
243 [73526]: https://github.com/rust-lang/rust/pull/73526/
244 [73583]: https://github.com/rust-lang/rust/pull/73583/
245 [73084]: https://github.com/rust-lang/rust/pull/73084/
246 [73197]: https://github.com/rust-lang/rust/pull/73197/
247 [72488]: https://github.com/rust-lang/rust/pull/72488/
248 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
249 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
250 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
251 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
252 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
253 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
254 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
255 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
256 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
257 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
258 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
259 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
260 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
261 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
262 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
265 Version 1.46.0 (2020-08-27)
266 ==========================
270 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
271 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
272 const functions.][73862]
273 - [The `#[track_caller]` attribute can now be added to functions to use the
274 function's caller's location information for panic messages.][72445]
275 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
276 `x.0.0` over `(x.0).0`.
277 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
278 You currently can't use `mem::transmute` in constant functions.
282 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
283 - [Enabled static "Position Independent Executables" by default
284 for `x86_64-unknown-linux-musl`.][70740]
288 - [`mem::forget` is now a `const fn`.][73887]
289 - [`String` now implements `From<char>`.][73466]
290 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
291 integer types.][73032]
292 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
293 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
294 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
295 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
296 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
297 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
302 - [`vec::Drain::as_slice`]
306 Added a number of new environment variables that are now available when
307 compiling your crate.
309 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
310 the specific binary being compiled and the name of the crate.
311 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
312 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
316 - [The target configuration option `abi_blacklist` has been renamed
317 to `unsupported_abis`.][74150] The old name will still continue to work.
318 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
319 This was previously accepted but will become a hard error in a future release.
320 - [Rustc will fail to compile if you have a struct with
321 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
323 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
324 ensure that spans have the correct information, and may cause breakage if you
325 were relying on receiving spans with dummy information.
326 - [The InnoSetup installer for Windows is no longer available.][72569] This was
327 a legacy installer that was replaced by a MSI installer a few years ago but
328 was still being built.
329 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
330 - [Rustc will no longer accept overlapping trait implementations that only
331 differ in how the lifetime was bound.][72493]
332 - [Rustc now correctly relates the lifetime of an existential associated
333 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
334 you to pass a shorter lifetime than expected.
335 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
336 The library will need to be installed for `rustc` to work, even though we
337 expect it to be already available on most systems.
338 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
340 - [Pretty printing of some tokens in procedural macros changed.][75453] The
341 exact output returned by rustc's pretty printing is an unstable
342 implementation detail: we recommend any macro relying on it to switch to a
343 more robust parsing system.
345 [75453]: https://github.com/rust-lang/rust/issues/75453/
346 [74820]: https://github.com/rust-lang/rust/issues/74820/
347 [74420]: https://github.com/rust-lang/rust/issues/74420/
348 [74109]: https://github.com/rust-lang/rust/pull/74109/
349 [74150]: https://github.com/rust-lang/rust/pull/74150/
350 [73862]: https://github.com/rust-lang/rust/pull/73862/
351 [73887]: https://github.com/rust-lang/rust/pull/73887/
352 [73466]: https://github.com/rust-lang/rust/pull/73466/
353 [73516]: https://github.com/rust-lang/rust/pull/73516/
354 [73293]: https://github.com/rust-lang/rust/pull/73293/
355 [73007]: https://github.com/rust-lang/rust/pull/73007/
356 [73032]: https://github.com/rust-lang/rust/pull/73032/
357 [72920]: https://github.com/rust-lang/rust/pull/72920/
358 [72569]: https://github.com/rust-lang/rust/pull/72569/
359 [72583]: https://github.com/rust-lang/rust/pull/72583/
360 [72584]: https://github.com/rust-lang/rust/pull/72584/
361 [72717]: https://github.com/rust-lang/rust/pull/72717/
362 [72437]: https://github.com/rust-lang/rust/pull/72437/
363 [72445]: https://github.com/rust-lang/rust/pull/72445/
364 [72486]: https://github.com/rust-lang/rust/pull/72486/
365 [72493]: https://github.com/rust-lang/rust/pull/72493/
366 [72331]: https://github.com/rust-lang/rust/pull/72331/
367 [71896]: https://github.com/rust-lang/rust/pull/71896/
368 [71660]: https://github.com/rust-lang/rust/pull/71660/
369 [71322]: https://github.com/rust-lang/rust/pull/71322/
370 [70740]: https://github.com/rust-lang/rust/pull/70740/
371 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
372 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
373 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
374 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
375 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
378 Version 1.45.2 (2020-08-03)
379 ==========================
381 * [Fix bindings in tuple struct patterns][74954]
382 * [Fix track_caller integration with trait objects][74784]
384 [74954]: https://github.com/rust-lang/rust/issues/74954
385 [74784]: https://github.com/rust-lang/rust/issues/74784
388 Version 1.45.1 (2020-07-30)
389 ==========================
391 * [Fix const propagation with references.][73613]
392 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
393 * [Avoid spurious implicit region bound.][74509]
394 * [Install clippy on x.py install][74457]
396 [73613]: https://github.com/rust-lang/rust/pull/73613
397 [73078]: https://github.com/rust-lang/rust/issues/73078
398 [74509]: https://github.com/rust-lang/rust/pull/74509
399 [74457]: https://github.com/rust-lang/rust/pull/74457
402 Version 1.45.0 (2020-07-16)
403 ==========================
407 - [Out of range float to int conversions using `as` has been defined as a saturating
408 conversion.][71269] This was previously undefined behaviour, but you can use the
409 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
410 may be desirable in rare performance sensitive situations.
411 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
413 - [Function like procedural macros can now be used in expression, pattern, and statement
414 positions.][68717] This means you can now use a function-like procedural macro
415 anywhere you can use a declarative (`macro_rules!`) macro.
419 - [You can now override individual target features through the `target-feature`
420 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
421 equivalent to `-C target-feature=+avx2,+fma`.
422 - [Added the `force-unwind-tables` flag.][69984] This option allows
423 rustc to always generate unwind tables regardless of panic strategy.
424 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
425 to include LLVM bitcode into generated `rlib`s (this is on by default).
426 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
427 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
428 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
429 - [Upgraded to LLVM 10.][67759]
431 \* Refer to Rust's [platform support page][forge-platform-support] for more
432 information on Rust's tiered platform support.
437 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
439 - [`proc_macro::TokenStream` now implements `Default`.][72234]
440 - [You can now use `char` with
441 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
442 a range of codepoints.][72413] E.g.
443 you can now write the following;
445 for ch in 'a'..='z' {
449 // Prints "abcdefghijklmnopqrstuvwxyz"
451 - [`OsString` now implements `FromStr`.][71662]
452 - [The `saturating_neg` method has been added to all signed integer primitive
453 types, and the `saturating_abs` method has been added for all integer
454 primitive types.][71886]
455 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
456 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
458 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
459 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
460 integer types.][69813]
461 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
462 integer types.][72324]
463 - [The `fetch_update` method has been added to all atomic integer types.][71843]
468 - [`BTreeMap::remove_entry`]
470 - [`rc::Weak::as_ptr`]
471 - [`rc::Weak::from_raw`]
472 - [`rc::Weak::into_raw`]
473 - [`str::strip_prefix`]
474 - [`str::strip_suffix`]
475 - [`sync::Weak::as_ptr`]
476 - [`sync::Weak::from_raw`]
477 - [`sync::Weak::into_raw`]
478 - [`char::UNICODE_VERSION`]
479 - [`Span::resolved_at`]
480 - [`Span::located_at`]
481 - [`Span::mixed_site`]
482 - [`unix::process::CommandExt::arg0`]
487 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
492 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
493 `~~outdated information~~` becomes "~~outdated information~~".
494 - [Added an emoji to Rustdoc's deprecated API message.][72014]
498 - [Trying to self initialize a static value (that is creating a value using
499 itself) is unsound and now causes a compile error.][71140]
500 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
501 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
502 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
503 previously undocumented and not intended for public use. Rustdoc still provides
504 a non-zero exit code on errors.
505 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
506 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
507 flags while cargo is adding `embed-bitcode` itself. The recommended way to
508 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
509 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
513 - [Make clippy a git subtree instead of a git submodule][70655]
514 - [Unify the undo log of all snapshot types][69464]
516 [71848]: https://github.com/rust-lang/rust/issues/71848/
517 [73420]: https://github.com/rust-lang/rust/issues/73420/
518 [72324]: https://github.com/rust-lang/rust/pull/72324/
519 [71843]: https://github.com/rust-lang/rust/pull/71843/
520 [71886]: https://github.com/rust-lang/rust/pull/71886/
521 [72234]: https://github.com/rust-lang/rust/pull/72234/
522 [72239]: https://github.com/rust-lang/rust/pull/72239/
523 [72397]: https://github.com/rust-lang/rust/pull/72397/
524 [72413]: https://github.com/rust-lang/rust/pull/72413/
525 [72014]: https://github.com/rust-lang/rust/pull/72014/
526 [72062]: https://github.com/rust-lang/rust/pull/72062/
527 [72094]: https://github.com/rust-lang/rust/pull/72094/
528 [72133]: https://github.com/rust-lang/rust/pull/72133/
529 [67759]: https://github.com/rust-lang/rust/pull/67759/
530 [71900]: https://github.com/rust-lang/rust/pull/71900/
531 [71928]: https://github.com/rust-lang/rust/pull/71928/
532 [71662]: https://github.com/rust-lang/rust/pull/71662/
533 [71716]: https://github.com/rust-lang/rust/pull/71716/
534 [71447]: https://github.com/rust-lang/rust/pull/71447/
535 [71269]: https://github.com/rust-lang/rust/pull/71269/
536 [71095]: https://github.com/rust-lang/rust/pull/71095/
537 [71140]: https://github.com/rust-lang/rust/pull/71140/
538 [70655]: https://github.com/rust-lang/rust/pull/70655/
539 [70705]: https://github.com/rust-lang/rust/pull/70705/
540 [69984]: https://github.com/rust-lang/rust/pull/69984/
541 [69813]: https://github.com/rust-lang/rust/pull/69813/
542 [69464]: https://github.com/rust-lang/rust/pull/69464/
543 [68717]: https://github.com/rust-lang/rust/pull/68717/
544 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
545 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
546 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
547 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
548 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
549 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
550 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
551 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
552 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
553 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
554 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
555 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
556 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
557 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
558 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
559 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
560 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
563 Version 1.44.1 (2020-06-18)
564 ===========================
566 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
567 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
568 * [Fix crashes when finding backtrace on macOS.][71397]
569 * [Clippy applies lint levels into different files.][clippy/5356]
571 [71397]: https://github.com/rust-lang/rust/issues/71397
572 [73078]: https://github.com/rust-lang/rust/issues/73078
573 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
574 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
577 Version 1.44.0 (2020-06-04)
578 ==========================
582 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
583 - [Added the `unused_braces` lint.][70081]
585 **Syntax-only changes**
587 - [Expansion-driven outline module parsing][69838]
592 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
597 These are still rejected semantically, so you will likely receive an error but
598 these changes can be seen and parsed by macros and conditional compilation.
602 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
603 Additionally when in incremental mode rustc defaults to 256 codegen units.
604 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
605 a panic is thrown.][67502]
606 - [Added tier 3\* support for the `aarch64-unknown-none` and
607 `aarch64-unknown-none-softfloat` targets.][68334]
608 - [Added tier 3 support for `arm64-apple-tvos` and
609 `x86_64-apple-tvos` targets.][68191]
614 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
615 `vec![]` to be able to be used in `const` contexts.
616 - [`convert::Infallible` now implements `Hash`.][70281]
617 - [`OsString` now implements `DerefMut` and `IndexMut` returning
618 a `&mut OsStr`.][70048]
619 - [Unicode 13 is now supported.][69929]
620 - [`String` now implements `From<&mut str>`.][69661]
621 - [`IoSlice` now implements `Copy`.][69403]
622 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
623 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
624 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
625 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
626 integer types.][69373]
630 - [`PathBuf::with_capacity`]
631 - [`PathBuf::capacity`]
633 - [`PathBuf::reserve`]
634 - [`PathBuf::reserve_exact`]
635 - [`PathBuf::shrink_to_fit`]
636 - [`f32::to_int_unchecked`]
637 - [`f64::to_int_unchecked`]
638 - [`Layout::align_to`]
639 - [`Layout::pad_to_align`]
645 - [Added the `cargo tree` command which will print a tree graph of
646 your dependencies.][cargo/8062] E.g.
648 mdbook v0.3.2 (/Users/src/rust/mdbook)
650 │ ├── html5ever v0.24.0
652 │ │ │ └── cfg-if v0.1.9
654 │ │ └── markup5ever v0.9.0
655 │ │ ├── log v0.4.8 (*)
657 │ │ │ └── phf_shared v0.7.24
658 │ │ │ ├── siphasher v0.2.3
659 │ │ │ └── unicase v1.4.2
660 │ │ │ [build-dependencies]
661 │ │ │ └── version_check v0.1.5
664 You can also display dependencies on multiple versions of the same crate with
665 `cargo tree -d` (short for `cargo tree --duplicates`).
669 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
670 the version in the sidebar.][69494]
674 - [Rustc now correctly generates static libraries on Windows GNU targets with
675 the `.a` extension, rather than the previous `.lib`.][70937]
676 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
677 - [The `file_name` property in JSON output of macro errors now points the actual
678 source file rather than the previous format of `<NAME macros>`.][70969]
679 **Note:** this may not point to a file that actually exists on the user's system.
680 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
681 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
682 not allow zero initialization such as `NonZeroU8`.][66059] This was
683 previously a warning.
684 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
685 operator has been defined as a saturating operation.][71269] This was previously
686 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
687 continue using the current behaviour, which may be desirable in rare performance
688 sensitive situations.
692 These changes provide no direct user facing benefits, but represent significant
693 improvements to the internals and overall performance of rustc and
696 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
697 - [Replace big JS dict with JSON parsing.][71250]
699 [69373]: https://github.com/rust-lang/rust/pull/69373/
700 [66059]: https://github.com/rust-lang/rust/pull/66059/
701 [68191]: https://github.com/rust-lang/rust/pull/68191/
702 [68899]: https://github.com/rust-lang/rust/pull/68899/
703 [71147]: https://github.com/rust-lang/rust/pull/71147/
704 [71250]: https://github.com/rust-lang/rust/pull/71250/
705 [70937]: https://github.com/rust-lang/rust/pull/70937/
706 [70969]: https://github.com/rust-lang/rust/pull/70969/
707 [70632]: https://github.com/rust-lang/rust/pull/70632/
708 [70281]: https://github.com/rust-lang/rust/pull/70281/
709 [70345]: https://github.com/rust-lang/rust/pull/70345/
710 [70048]: https://github.com/rust-lang/rust/pull/70048/
711 [70081]: https://github.com/rust-lang/rust/pull/70081/
712 [70156]: https://github.com/rust-lang/rust/pull/70156/
713 [71269]: https://github.com/rust-lang/rust/pull/71269/
714 [69838]: https://github.com/rust-lang/rust/pull/69838/
715 [69929]: https://github.com/rust-lang/rust/pull/69929/
716 [69661]: https://github.com/rust-lang/rust/pull/69661/
717 [69778]: https://github.com/rust-lang/rust/pull/69778/
718 [69494]: https://github.com/rust-lang/rust/pull/69494/
719 [69403]: https://github.com/rust-lang/rust/pull/69403/
720 [69033]: https://github.com/rust-lang/rust/pull/69033/
721 [68692]: https://github.com/rust-lang/rust/pull/68692/
722 [68334]: https://github.com/rust-lang/rust/pull/68334/
723 [67502]: https://github.com/rust-lang/rust/pull/67502/
724 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
725 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
726 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
727 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
728 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
729 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
730 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
731 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
732 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
733 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
734 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
735 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
736 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
739 Version 1.43.1 (2020-05-07)
740 ===========================
742 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
743 * [Fixed the stabilization of AVX-512 features.][71473]
744 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
746 [71430]: https://github.com/rust-lang/rust/pull/71430
747 [71473]: https://github.com/rust-lang/rust/issues/71473
748 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
751 Version 1.43.0 (2020-04-23)
752 ==========================
756 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
757 the type inferred correctly.][68129]
758 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
760 **Syntax only changes**
761 - [Allow `type Foo: Ord` syntactically.][69361]
762 - [Fuse associated and extern items up to defaultness.][69194]
763 - [Syntactically allow `self` in all `fn` contexts.][68764]
764 - [Merge `fn` syntax + cleanup item parsing.][68728]
765 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
766 For example, you may now write:
768 macro_rules! mac_trait {
778 These are still rejected *semantically*, so you will likely receive an error but
779 these changes can be seen and parsed by macros and
780 conditional compilation.
785 - [You can now pass multiple lint flags to rustc to override the previous
786 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
787 everything in the `unused` lint group except `unused-variables` which
788 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
789 everything in the `unused` lint group **including** `unused-variables` since
790 the allow flag is specified before the deny flag (and therefore overridden).
791 - [rustc will now prefer your system MinGW libraries over its bundled libraries
792 if they are available on `windows-gnu`.][67429]
793 - [rustc now buffers errors/warnings printed in JSON.][69227]
797 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
798 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
799 respectively.][69538] **Note** These conversions are only available when `N`
801 - [You can now use associated constants on floats and integers directly, rather
802 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
803 `f32::NAN` with no imports.
804 - [`u8::is_ascii` is now `const`.][68984]
805 - [`String` now implements `AsMut<str>`.][68742]
806 - [Added the `primitive` module to `std` and `core`.][67637] This module
807 reexports Rust's primitive types. This is mainly useful in macros
808 where you want avoid these types being shadowed.
809 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
810 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
814 - [`Once::is_completed`]
819 - [`iter::once_with`]
823 - [You can now set config `[profile]`s in your `.cargo/config`, or through
824 your environment.][cargo/7823]
825 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
826 executable path when running integration tests or benchmarks.][cargo/7697]
827 `<name>` is the name of your binary as-is e.g. If you wanted the executable
828 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
832 - [Certain checks in the `const_err` lint were deemed unrelated to const
833 evaluation][69185], and have been moved to the `unconditional_panic` and
834 `arithmetic_overflow` lints.
839 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
840 has been a warning since 1.36.0.
841 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
842 led to some instances being accepted, and now correctly emits a hard error.
844 [69340]: https://github.com/rust-lang/rust/pull/69340
848 These changes provide no direct user facing benefits, but represent significant
849 improvements to the internals and overall performance of `rustc` and
852 - [All components are now built with `opt-level=3` instead of `2`.][67878]
853 - [Improved how rustc generates drop code.][67332]
854 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
855 - [traits: preallocate 2 Vecs of known initial size][69022]
856 - [Avoid exponential behaviour when relating types][68772]
857 - [Skip `Drop` terminators for enum variants without drop glue][68943]
858 - [Improve performance of coherence checks][68966]
859 - [Deduplicate types in the generator witness][68672]
860 - [Invert control in struct_lint_level.][68725]
862 [67332]: https://github.com/rust-lang/rust/pull/67332/
863 [67429]: https://github.com/rust-lang/rust/pull/67429/
864 [67637]: https://github.com/rust-lang/rust/pull/67637/
865 [67642]: https://github.com/rust-lang/rust/pull/67642/
866 [67878]: https://github.com/rust-lang/rust/pull/67878/
867 [67885]: https://github.com/rust-lang/rust/pull/67885/
868 [68129]: https://github.com/rust-lang/rust/pull/68129/
869 [68672]: https://github.com/rust-lang/rust/pull/68672/
870 [68725]: https://github.com/rust-lang/rust/pull/68725/
871 [68728]: https://github.com/rust-lang/rust/pull/68728/
872 [68738]: https://github.com/rust-lang/rust/pull/68738/
873 [68742]: https://github.com/rust-lang/rust/pull/68742/
874 [68764]: https://github.com/rust-lang/rust/pull/68764/
875 [68772]: https://github.com/rust-lang/rust/pull/68772/
876 [68943]: https://github.com/rust-lang/rust/pull/68943/
877 [68952]: https://github.com/rust-lang/rust/pull/68952/
878 [68966]: https://github.com/rust-lang/rust/pull/68966/
879 [68984]: https://github.com/rust-lang/rust/pull/68984/
880 [69022]: https://github.com/rust-lang/rust/pull/69022/
881 [69185]: https://github.com/rust-lang/rust/pull/69185/
882 [69194]: https://github.com/rust-lang/rust/pull/69194/
883 [69201]: https://github.com/rust-lang/rust/pull/69201/
884 [69227]: https://github.com/rust-lang/rust/pull/69227/
885 [69548]: https://github.com/rust-lang/rust/pull/69548/
886 [69256]: https://github.com/rust-lang/rust/pull/69256/
887 [69361]: https://github.com/rust-lang/rust/pull/69361/
888 [69366]: https://github.com/rust-lang/rust/pull/69366/
889 [69538]: https://github.com/rust-lang/rust/pull/69538/
890 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
891 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
892 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
893 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
894 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
895 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
896 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
897 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
900 Version 1.42.0 (2020-03-12)
901 ==========================
905 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
907 fn foo(words: &[&str]) {
909 ["Hello", "World", "!", ..] => println!("Hello World!"),
910 ["Foo", "Bar", ..] => println!("Baz"),
911 rest => println!("{:?}", rest),
915 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
916 that you can create an enum that has the exact layout and ABI of the type
918 - [There are some *syntax-only* changes:][67131]
919 - `default` is syntactically allowed before items in `trait` definitions.
920 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
921 leave out their bodies in favor of `;`.
922 - Bounds on associated types in `impl`s are now syntactically allowed
923 (e.g. `type Foo: Ord;`).
924 - `...` (the C-variadic type) may occur syntactically directly as the type of
925 any function parameter.
927 These are still rejected *semantically*, so you will likely receive an error
928 but these changes can be seen and parsed by procedural macros and
929 conditional compilation.
933 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
934 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
935 - [`Option::{expect,unwrap}` and
936 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
937 pointing to the location where they were called, rather than
938 `core`'s internals. ][67887]
940 \* Refer to Rust's [platform support page][forge-platform-support] for more
941 information on Rust's tiered platform support.
945 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
946 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
947 to implement `Sized`.][67935]
948 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
949 - [`Layout::new` is now `const`.][66254]
950 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
955 - [`CondVar::wait_while`]
956 - [`CondVar::wait_timeout_while`]
958 - [`DebugMap::value`]
959 - [`ManuallyDrop::take`]
961 - [`ptr::slice_from_raw_parts_mut`]
962 - [`ptr::slice_from_raw_parts`]
966 - [You no longer need to include `extern crate proc_macro;` to be able to
967 `use proc_macro;` in the `2018` edition.][cargo/7700]
971 - [`Error::description` has been deprecated, and its use will now produce a
972 warning.][66919] It's recommended to use `Display`/`to_string` instead.
974 [68253]: https://github.com/rust-lang/rust/pull/68253/
975 [68348]: https://github.com/rust-lang/rust/pull/68348/
976 [67935]: https://github.com/rust-lang/rust/pull/67935/
977 [68339]: https://github.com/rust-lang/rust/pull/68339/
978 [68122]: https://github.com/rust-lang/rust/pull/68122/
979 [67712]: https://github.com/rust-lang/rust/pull/67712/
980 [67887]: https://github.com/rust-lang/rust/pull/67887/
981 [67131]: https://github.com/rust-lang/rust/pull/67131/
982 [67233]: https://github.com/rust-lang/rust/pull/67233/
983 [66899]: https://github.com/rust-lang/rust/pull/66899/
984 [66919]: https://github.com/rust-lang/rust/pull/66919/
985 [66254]: https://github.com/rust-lang/rust/pull/66254/
986 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
987 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
988 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
989 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
990 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
991 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
992 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
993 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
994 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
997 Version 1.41.1 (2020-02-27)
998 ===========================
1000 * [Always check types of static items][69145]
1001 * [Always check lifetime bounds of `Copy` impls][69145]
1002 * [Fix miscompilation in callers of `Layout::repeat`][69225]
1004 [69225]: https://github.com/rust-lang/rust/issues/69225
1005 [69145]: https://github.com/rust-lang/rust/pull/69145
1008 Version 1.41.0 (2020-01-30)
1009 ===========================
1014 - [You can now pass type parameters to foreign items when implementing
1015 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
1016 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
1017 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
1018 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
1019 - [You can now use any valid identifier in a `format_args` macro.][66847]
1020 Previously identifiers starting with an underscore were not allowed.
1021 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
1022 enum variants.][66183] These are still rejected semantically, but
1023 can be seen and parsed by procedural macros and conditional compilation.
1028 - [Rustc will now warn if you have unused loop `'label`s.][66325]
1029 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
1030 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
1031 - [You can now pass an arguments file passing the `@path` syntax
1032 to rustc.][66172] Note that the format differs somewhat from what is
1033 found in other tooling; please see [the documentation][argfile-docs] for
1035 - [You can now provide `--extern` flag without a path, indicating that it is
1036 available from the search path or specified with an `-L` flag.][64882]
1038 \* Refer to Rust's [platform support page][forge-platform-support] for more
1039 information on Rust's tiered platform support.
1041 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
1046 - [The `core::panic` module is now stable.][66771] It was already stable
1048 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
1049 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
1050 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
1055 - [`Result::map_or`]
1056 - [`Result::map_or_else`]
1057 - [`std::rc::Weak::weak_count`]
1058 - [`std::rc::Weak::strong_count`]
1059 - [`std::sync::Weak::weak_count`]
1060 - [`std::sync::Weak::strong_count`]
1065 - [Cargo will now document all the private items for binary crates
1066 by default.][cargo/7593]
1067 - [`cargo-install` will now reinstall the package if it detects that it is out
1068 of date.][cargo/7560]
1069 - [Cargo.lock now uses a more git friendly format that should help to reduce
1070 merge conflicts.][cargo/7579]
1071 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
1072 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
1073 optimisation level to `2` for debug builds. You can also use
1074 `[profile.<profile>.build-override]` to override build scripts and
1080 - [You can now specify `edition` in documentation code blocks to compile the block
1081 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
1082 should be compiled the 2018 edition of Rust.
1083 - [You can now provide custom themes to rustdoc with `--theme`, and check the
1084 current theme with `--check-theme`.][54733]
1085 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
1090 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
1091 Apple targets.][apple-32bit-drop] This means that the source code is still
1092 available to build, but the targets are no longer being tested and release
1093 binaries for those platforms will no longer be distributed by the Rust project.
1094 Please refer to the linked blog post for more information.
1096 [54733]: https://github.com/rust-lang/rust/pull/54733/
1097 [61351]: https://github.com/rust-lang/rust/pull/61351/
1098 [67255]: https://github.com/rust-lang/rust/pull/67255/
1099 [66661]: https://github.com/rust-lang/rust/pull/66661/
1100 [66771]: https://github.com/rust-lang/rust/pull/66771/
1101 [66847]: https://github.com/rust-lang/rust/pull/66847/
1102 [66238]: https://github.com/rust-lang/rust/pull/66238/
1103 [66277]: https://github.com/rust-lang/rust/pull/66277/
1104 [66325]: https://github.com/rust-lang/rust/pull/66325/
1105 [66172]: https://github.com/rust-lang/rust/pull/66172/
1106 [66183]: https://github.com/rust-lang/rust/pull/66183/
1107 [65879]: https://github.com/rust-lang/rust/pull/65879/
1108 [65013]: https://github.com/rust-lang/rust/pull/65013/
1109 [64882]: https://github.com/rust-lang/rust/pull/64882/
1110 [64325]: https://github.com/rust-lang/rust/pull/64325/
1111 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
1112 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
1113 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
1114 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
1115 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
1116 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
1117 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
1118 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
1119 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
1120 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
1121 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
1123 Version 1.40.0 (2019-12-19)
1124 ===========================
1128 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
1129 `const` contexts.][65188] e.g.
1132 pub struct Point(i32, i32);
1134 const ORIGIN: Point = {
1135 let constructor = Point;
1141 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
1142 indicate that there may be variants or fields added in the future.][64639]
1143 For example this requires adding a wild-card branch (`_ => {}`) to any match
1144 statements on a non-exhaustive `enum`. [(RFC 2008)]
1145 - [You can now use function-like procedural macros in `extern` blocks and in
1146 type positions.][63931] e.g. `type Generated = macro!();`
1147 - [Function-like and attribute procedural macros can now emit
1148 `macro_rules!` items, so you can now have your macros generate macros.][64035]
1149 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
1150 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
1151 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
1155 - [Added tier 3 support\* for the
1156 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
1157 - [Added tier 3 support for the
1158 `aarch64-unknown-none-softfloat` target.][64589]
1159 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
1160 `mips64el-unknown-linux-muslabi64` targets.][65843]
1162 \* Refer to Rust's [platform support page][forge-platform-support] for more
1163 information on Rust's tiered platform support.
1167 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
1171 - [`BTreeMap::get_key_value`]
1172 - [`HashMap::get_key_value`]
1173 - [`Option::as_deref_mut`]
1174 - [`Option::as_deref`]
1175 - [`Option::flatten`]
1176 - [`UdpSocket::peer_addr`]
1177 - [`f32::to_be_bytes`]
1178 - [`f32::to_le_bytes`]
1179 - [`f32::to_ne_bytes`]
1180 - [`f64::to_be_bytes`]
1181 - [`f64::to_le_bytes`]
1182 - [`f64::to_ne_bytes`]
1183 - [`f32::from_be_bytes`]
1184 - [`f32::from_le_bytes`]
1185 - [`f32::from_ne_bytes`]
1186 - [`f64::from_be_bytes`]
1187 - [`f64::from_le_bytes`]
1188 - [`f64::from_ne_bytes`]
1195 - [Cargo will now always display warnings, rather than only on
1196 fresh builds.][cargo/7450]
1197 - [Feature flags (except `--all-features`) passed to a virtual workspace will
1198 now produce an error.][cargo/7507] Previously these flags were ignored.
1199 - [You can now publish `dev-dependencies` without including
1200 a `version`.][cargo/7333]
1204 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
1205 when running documentation tests with `rustdoc`.][63803]
1209 - [As previously announced, any previous NLL warnings in the 2015 edition are
1210 now hard errors.][64221]
1211 - [The `include!` macro will now warn if it failed to include the
1212 entire file.][64284] The `include!` macro unintentionally only includes the
1213 first _expression_ in a file, and this can be unintuitive. This will become
1214 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
1215 - [Using `#[inline]` on function prototypes and consts now emits a warning under
1216 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
1217 or `extern` blocks now correctly emits a hard error.
1219 [65294]: https://github.com/rust-lang/rust/pull/65294/
1220 [66103]: https://github.com/rust-lang/rust/pull/66103/
1221 [65843]: https://github.com/rust-lang/rust/pull/65843/
1222 [65188]: https://github.com/rust-lang/rust/pull/65188/
1223 [65092]: https://github.com/rust-lang/rust/pull/65092/
1224 [64589]: https://github.com/rust-lang/rust/pull/64589/
1225 [64639]: https://github.com/rust-lang/rust/pull/64639/
1226 [64221]: https://github.com/rust-lang/rust/pull/64221/
1227 [64284]: https://github.com/rust-lang/rust/pull/64284/
1228 [63931]: https://github.com/rust-lang/rust/pull/63931/
1229 [64035]: https://github.com/rust-lang/rust/pull/64035/
1230 [63674]: https://github.com/rust-lang/rust/pull/63674/
1231 [63803]: https://github.com/rust-lang/rust/pull/63803/
1232 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
1233 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
1234 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
1235 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
1236 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
1237 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
1238 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
1239 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
1240 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
1241 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
1242 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
1243 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
1244 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
1245 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
1246 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
1247 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
1248 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
1249 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
1250 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
1251 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
1252 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
1253 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
1254 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
1255 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
1256 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
1257 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
1260 Version 1.39.0 (2019-11-07)
1261 ===========================
1265 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
1266 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
1267 - [You can now use certain attributes on function, closure, and function pointer
1268 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
1269 `deny`, `forbid` as well as inert helper attributes used by procedural macro
1270 attributes applied to items. e.g.
1273 #[cfg(windows)] slice: &[u16],
1274 #[cfg(not(windows))] slice: &[u8],
1279 - [You can now take shared references to bind-by-move patterns in the `if` guards
1280 of `match` arms.][63118] e.g.
1283 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1287 // ---- `nums` is bound by move.
1288 if nums.iter().sum::<u8>() == 10
1289 // ^------ `.iter()` implicitly takes a reference to `nums`.
1292 // ----------- Legal as `nums` was bound by move and so we have ownership.
1294 _ => unreachable!(),
1303 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1304 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1305 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1306 **Note** Cargo currently doesn't use this feature. Refer to
1307 [cargo#7315][cargo/7315] to track this feature's progress.
1308 - [You can now pass `--show-output` argument to test binaries to print the
1309 output of successful tests.][62600]
1312 \* Refer to Rust's [platform support page][forge-platform-support] for more
1313 information on Rust's tiered platform support.
1317 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1318 - [`LinkedList::new` is now a `const` function.][63684]
1319 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1320 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1321 now `const`.][63786]
1325 - [`Pin::into_inner`]
1326 - [`Instant::checked_duration_since`]
1327 - [`Instant::saturating_duration_since`]
1331 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1332 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1333 `--all` is now deprecated.
1337 - [You can now pass `-Clinker` to rustdoc to control the linker used
1338 for compiling doctests.][63834]
1342 - [Code that was previously accepted by the old borrow checker, but rejected by
1343 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1344 previously a warning, and will also become a hard error in the Rust 2015
1345 edition in the 1.40.0 release.
1346 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1347 run tests.][63827] This should improve performance when running a large
1349 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1350 recommended to use the `?` operator instead.
1351 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1354 [62600]: https://github.com/rust-lang/rust/pull/62600/
1355 [62672]: https://github.com/rust-lang/rust/pull/62672/
1356 [63118]: https://github.com/rust-lang/rust/pull/63118/
1357 [63209]: https://github.com/rust-lang/rust/pull/63209/
1358 [63402]: https://github.com/rust-lang/rust/pull/63402/
1359 [63565]: https://github.com/rust-lang/rust/pull/63565/
1360 [63595]: https://github.com/rust-lang/rust/pull/63595/
1361 [63684]: https://github.com/rust-lang/rust/pull/63684/
1362 [63698]: https://github.com/rust-lang/rust/pull/63698/
1363 [63770]: https://github.com/rust-lang/rust/pull/63770/
1364 [63786]: https://github.com/rust-lang/rust/pull/63786/
1365 [63827]: https://github.com/rust-lang/rust/pull/63827/
1366 [63834]: https://github.com/rust-lang/rust/pull/63834/
1367 [63927]: https://github.com/rust-lang/rust/pull/63927/
1368 [63933]: https://github.com/rust-lang/rust/pull/63933/
1369 [63934]: https://github.com/rust-lang/rust/pull/63934/
1370 [63938]: https://github.com/rust-lang/rust/pull/63938/
1371 [63940]: https://github.com/rust-lang/rust/pull/63940/
1372 [63941]: https://github.com/rust-lang/rust/pull/63941/
1373 [63945]: https://github.com/rust-lang/rust/pull/63945/
1374 [64010]: https://github.com/rust-lang/rust/pull/64010/
1375 [64028]: https://github.com/rust-lang/rust/pull/64028/
1376 [64334]: https://github.com/rust-lang/rust/pull/64334/
1377 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1378 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1379 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1380 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1381 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1382 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1384 Version 1.38.0 (2019-09-26)
1385 ==========================
1389 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1390 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1394 - [Added pipelined compilation support to `rustc`.][62766] This will
1395 improve compilation times in some cases. For further information please refer
1396 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1397 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1398 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1399 `x86_64-uwp-windows-msvc` targets.][60260]
1400 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1401 `armv7-unknown-linux-musleabi` targets.][63107]
1402 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1403 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1404 - [Upgraded to LLVM 9.][62592]
1406 \* Refer to Rust's [platform support page][forge-platform-support] for more
1407 information on Rust's tiered platform support.
1411 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1412 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1413 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1414 is available at `std::clone::Clone`). This also makes all built-in macros
1415 available in `std`/`core` root. e.g. `std::include_bytes!`.
1416 - [`str::Chars` now implements `Debug`.][63000]
1417 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1418 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1419 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1420 - [Added euclidean remainder and division operations (`div_euclid`,
1421 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1422 `overflowing`, and `wrapping` versions are available for all
1424 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1425 `PartialEq`.][61491]
1426 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1430 - [`<*const T>::cast`]
1431 - [`<*mut T>::cast`]
1432 - [`Duration::as_secs_f32`]
1433 - [`Duration::as_secs_f64`]
1434 - [`Duration::div_f32`]
1435 - [`Duration::div_f64`]
1436 - [`Duration::from_secs_f32`]
1437 - [`Duration::from_secs_f64`]
1438 - [`Duration::mul_f32`]
1439 - [`Duration::mul_f64`]
1440 - [`any::type_name`]
1444 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1445 - [You can now pass the `--features` option multiple times to enable
1446 multiple features.][cargo/7084]
1450 - [`rustc` will now warn about some incorrect uses of
1451 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1455 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1457 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1458 issues][62896] with certain crates such as libc.
1460 [60260]: https://github.com/rust-lang/rust/pull/60260/
1461 [61457]: https://github.com/rust-lang/rust/pull/61457/
1462 [61491]: https://github.com/rust-lang/rust/pull/61491/
1463 [61884]: https://github.com/rust-lang/rust/pull/61884/
1464 [61953]: https://github.com/rust-lang/rust/pull/61953/
1465 [62042]: https://github.com/rust-lang/rust/pull/62042/
1466 [62528]: https://github.com/rust-lang/rust/pull/62528/
1467 [62583]: https://github.com/rust-lang/rust/pull/62583/
1468 [62735]: https://github.com/rust-lang/rust/pull/62735/
1469 [62766]: https://github.com/rust-lang/rust/pull/62766/
1470 [62784]: https://github.com/rust-lang/rust/pull/62784/
1471 [62592]: https://github.com/rust-lang/rust/pull/62592/
1472 [62785]: https://github.com/rust-lang/rust/issues/62785/
1473 [62814]: https://github.com/rust-lang/rust/pull/62814/
1474 [62896]: https://github.com/rust-lang/rust/issues/62896/
1475 [63000]: https://github.com/rust-lang/rust/pull/63000/
1476 [63056]: https://github.com/rust-lang/rust/pull/63056/
1477 [63107]: https://github.com/rust-lang/rust/pull/63107/
1478 [63346]: https://github.com/rust-lang/rust/pull/63346/
1479 [63421]: https://github.com/rust-lang/rust/pull/63421/
1480 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1481 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1482 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1483 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1484 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1485 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1486 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1487 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1488 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1489 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1490 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1491 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1492 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1493 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1494 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1496 Version 1.37.0 (2019-08-15)
1497 ==========================
1501 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1502 [`Box`][62228], or an [array][62235] and unused.
1503 - [You can now use the `cfg` and `cfg_attr` attributes on
1504 generic parameters.][61547]
1505 - [You can now use enum variants through type alias.][61682] e.g. You can
1506 write the following:
1508 type MyOption = Option<u8>;
1510 fn increment_or_zero(x: MyOption) -> u8 {
1512 MyOption::Some(y) => y + 1,
1513 MyOption::None => 0,
1517 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1518 `const _: u32 = 5;`.
1519 - [You can now use `#[repr(align(X)]` on enums.][61229]
1520 - [The `?` Kleene macro operator is now available in the
1521 2015 edition.][60932]
1525 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1526 and `-C profile-use` flags.][61268] For more information on how to use profile
1527 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1528 - [The `rust-lldb` wrapper script should now work again.][61827]
1532 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1536 - [`BufReader::buffer`]
1537 - [`BufWriter::buffer`]
1538 - [`Cell::from_mut`]
1539 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1540 - [`DoubleEndedIterator::nth_back`]
1542 - [`Wrapping::reverse_bits`]
1543 - [`i128::reverse_bits`]
1544 - [`i16::reverse_bits`]
1545 - [`i32::reverse_bits`]
1546 - [`i64::reverse_bits`]
1547 - [`i8::reverse_bits`]
1548 - [`isize::reverse_bits`]
1549 - [`slice::copy_within`]
1550 - [`u128::reverse_bits`]
1551 - [`u16::reverse_bits`]
1552 - [`u32::reverse_bits`]
1553 - [`u64::reverse_bits`]
1554 - [`u8::reverse_bits`]
1555 - [`usize::reverse_bits`]
1559 - [`Cargo.lock` files are now included by default when publishing executable crates
1560 with executables.][cargo/7026]
1561 - [You can now specify `default-run="foo"` in `[package]` to specify the
1562 default executable to use for `cargo run`.][cargo/7056]
1569 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1570 Please transition your code to using the `..=` syntax for inclusive
1572 - [Using a trait object without the `dyn` will now warn by default.][61203]
1573 Please transition your code to use `dyn Trait` for trait objects instead.
1575 [62228]: https://github.com/rust-lang/rust/pull/62228/
1576 [62235]: https://github.com/rust-lang/rust/pull/62235/
1577 [61802]: https://github.com/rust-lang/rust/pull/61802/
1578 [61827]: https://github.com/rust-lang/rust/pull/61827/
1579 [61547]: https://github.com/rust-lang/rust/pull/61547/
1580 [61682]: https://github.com/rust-lang/rust/pull/61682/
1581 [61268]: https://github.com/rust-lang/rust/pull/61268/
1582 [61342]: https://github.com/rust-lang/rust/pull/61342/
1583 [61347]: https://github.com/rust-lang/rust/pull/61347/
1584 [61100]: https://github.com/rust-lang/rust/pull/61100/
1585 [61203]: https://github.com/rust-lang/rust/pull/61203/
1586 [61229]: https://github.com/rust-lang/rust/pull/61229/
1587 [60932]: https://github.com/rust-lang/rust/pull/60932/
1588 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1589 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1590 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1591 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1592 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1593 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1594 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1595 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1596 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1597 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1598 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1599 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1600 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1601 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1602 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1603 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1604 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1605 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1606 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1607 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1608 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1609 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1610 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1611 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1614 Version 1.36.0 (2019-07-04)
1615 ==========================
1619 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1620 - [The order of traits in trait objects no longer affects the semantics of that
1621 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1622 `dyn fmt::Debug + Send`, where this was previously not the case.
1626 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1627 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1628 - [`mem::needs_drop` is now available as a const fn.][60364]
1629 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1630 - [`String` now implements `BorrowMut<str>`.][60404]
1631 - [`io::Cursor` now implements `Default`.][60234]
1632 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1633 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1634 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1635 environment has access to heap memory allocation.
1636 - [`String` now implements `From<&String>`.][59825]
1637 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1638 return a tuple of each argument when there is multiple arguments.
1639 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1644 - [`VecDeque::rotate_left`]
1645 - [`VecDeque::rotate_right`]
1646 - [`Iterator::copied`]
1648 - [`io::IoSliceMut`]
1649 - [`Read::read_vectored`]
1650 - [`Write::write_vectored`]
1651 - [`str::as_mut_ptr`]
1652 - [`mem::MaybeUninit`]
1653 - [`pointer::align_offset`]
1654 - [`future::Future`]
1656 - [`task::RawWaker`]
1657 - [`task::RawWakerVTable`]
1663 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1664 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1666 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1670 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1677 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1678 longer recommended, and will be deprecated in 1.39.0.
1680 [60318]: https://github.com/rust-lang/rust/pull/60318/
1681 [60364]: https://github.com/rust-lang/rust/pull/60364/
1682 [60370]: https://github.com/rust-lang/rust/pull/60370/
1683 [60404]: https://github.com/rust-lang/rust/pull/60404/
1684 [60234]: https://github.com/rust-lang/rust/pull/60234/
1685 [60244]: https://github.com/rust-lang/rust/pull/60244/
1686 [58623]: https://github.com/rust-lang/rust/pull/58623/
1687 [59648]: https://github.com/rust-lang/rust/pull/59648/
1688 [59675]: https://github.com/rust-lang/rust/pull/59675/
1689 [59825]: https://github.com/rust-lang/rust/pull/59825/
1690 [59826]: https://github.com/rust-lang/rust/pull/59826/
1691 [59445]: https://github.com/rust-lang/rust/pull/59445/
1692 [59114]: https://github.com/rust-lang/rust/pull/59114/
1693 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1694 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1695 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1696 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1697 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1698 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1699 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1700 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1701 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1702 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1703 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1704 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1705 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1706 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1707 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1708 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1709 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1710 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1711 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1712 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1715 Version 1.35.0 (2019-05-23)
1716 ==========================
1720 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1721 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1722 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1724 unsafe fn call_unsafe(func: unsafe fn()) {
1729 unsafe { call_unsafe(|| {}); }
1736 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1737 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1738 - [Added the `wasm32-unknown-wasi` target.][59464]
1743 - [`Thread` will now show its ID in `Debug` output.][59460]
1744 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1745 - [`alloc::System` now implements `Default`.][59451]
1746 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1748 - [`char::{ToLowercase, ToUppercase}` now
1749 implement `ExactSizeIterator`.][58778]
1750 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1751 - [Removed the `Read` trait bounds
1752 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1753 - [You can now call the `dbg!` macro without any parameters to print the file
1754 and line where it is called.][57847]
1755 - [In place ASCII case conversions are now up to 4× faster.][59283]
1756 e.g. `str::make_ascii_lowercase`
1757 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1764 - [`RefCell::replace_with`]
1765 - [`RefCell::map_split`]
1767 - [`Range::contains`]
1768 - [`RangeFrom::contains`]
1769 - [`RangeTo::contains`]
1770 - [`RangeInclusive::contains`]
1771 - [`RangeToInclusive::contains`]
1772 - [`Option::copied`]
1776 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1777 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1782 - [The Rust toolchain is now available natively for musl based distros.][58575]
1784 [59460]: https://github.com/rust-lang/rust/pull/59460/
1785 [59464]: https://github.com/rust-lang/rust/pull/59464/
1786 [59500]: https://github.com/rust-lang/rust/pull/59500/
1787 [59512]: https://github.com/rust-lang/rust/pull/59512/
1788 [59580]: https://github.com/rust-lang/rust/pull/59580/
1789 [59283]: https://github.com/rust-lang/rust/pull/59283/
1790 [59451]: https://github.com/rust-lang/rust/pull/59451/
1791 [59076]: https://github.com/rust-lang/rust/pull/59076/
1792 [58778]: https://github.com/rust-lang/rust/pull/58778/
1793 [58717]: https://github.com/rust-lang/rust/pull/58717/
1794 [58369]: https://github.com/rust-lang/rust/pull/58369/
1795 [58423]: https://github.com/rust-lang/rust/pull/58423/
1796 [58080]: https://github.com/rust-lang/rust/pull/58080/
1797 [57847]: https://github.com/rust-lang/rust/pull/57847/
1798 [58575]: https://github.com/rust-lang/rust/pull/58575
1799 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1800 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1801 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1802 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1803 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1804 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1805 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1806 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1807 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1808 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1809 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1810 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1812 Version 1.34.2 (2019-05-14)
1813 ===========================
1815 * [Destabilize the `Error::type_id` function due to a security
1816 vulnerability][60785] ([CVE-2019-12083])
1818 [60785]: https://github.com/rust-lang/rust/pull/60785
1819 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1821 Version 1.34.1 (2019-04-25)
1822 ===========================
1824 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1825 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1826 * [Fix Clippy panic when checking some macros][clippy/3805]
1828 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1829 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1830 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1832 Version 1.34.0 (2019-04-11)
1833 ==========================
1837 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1838 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1840 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1841 `#[attr{}]` procedural macros.][57367]
1842 - [You can now write `extern crate self as foo;`][57407] to import your
1843 crate's root into the extern prelude.
1848 - [You can now target `riscv64imac-unknown-none-elf` and
1849 `riscv64gc-unknown-none-elf`.][58406]
1850 - [You can now enable linker plugin LTO optimisations with
1851 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1852 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1854 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1859 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1860 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1861 the `Hash` trait to create an iterator.
1862 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1863 methods.][58421] Most notably you no longer require the `Ord` trait to create
1865 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1866 for all numeric types.][58044]
1867 - [Indexing a `str` is now generic over all types that
1868 implement `SliceIndex<str>`.][57604]
1869 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1870 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1871 produce a warning if their returning type is unused.
1872 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1873 `overflowing_pow` are now available for all numeric types.][57873] These are
1874 equivalent to methods such as `wrapping_add` for the `pow` operation.
1882 * [`Error::type_id`]
1883 * [`atomic::AtomicI16`]
1884 * [`atomic::AtomicI32`]
1885 * [`atomic::AtomicI64`]
1886 * [`atomic::AtomicI8`]
1887 * [`atomic::AtomicU16`]
1888 * [`atomic::AtomicU32`]
1889 * [`atomic::AtomicU64`]
1890 * [`atomic::AtomicU8`]
1891 * [`convert::Infallible`]
1892 * [`convert::TryFrom`]
1893 * [`convert::TryInto`]
1895 * [`iter::successors`]
1896 * [`num::NonZeroI128`]
1897 * [`num::NonZeroI16`]
1898 * [`num::NonZeroI32`]
1899 * [`num::NonZeroI64`]
1900 * [`num::NonZeroI8`]
1901 * [`num::NonZeroIsize`]
1902 * [`slice::sort_by_cached_key`]
1903 * [`str::escape_debug`]
1904 * [`str::escape_default`]
1905 * [`str::escape_unicode`]
1906 * [`str::split_ascii_whitespace`]
1909 * [`Instant::checked_add`]
1910 * [`Instant::checked_sub`]
1911 * [`SystemTime::checked_add`]
1912 * [`SystemTime::checked_sub`]
1916 - [You can now use alternative registries to crates.io.][cargo/6654]
1920 - [You can now use the `?` operator in your documentation tests without manually
1921 adding `fn main() -> Result<(), _> {}`.][56470]
1925 - [`Command::before_exec` is being replaced by the unsafe method
1926 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1927 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1928 can now use `const` functions in `static` variables.
1930 [58370]: https://github.com/rust-lang/rust/pull/58370/
1931 [58406]: https://github.com/rust-lang/rust/pull/58406/
1932 [58421]: https://github.com/rust-lang/rust/pull/58421/
1933 [58166]: https://github.com/rust-lang/rust/pull/58166/
1934 [58044]: https://github.com/rust-lang/rust/pull/58044/
1935 [58057]: https://github.com/rust-lang/rust/pull/58057/
1936 [58059]: https://github.com/rust-lang/rust/pull/58059/
1937 [57809]: https://github.com/rust-lang/rust/pull/57809/
1938 [57873]: https://github.com/rust-lang/rust/pull/57873/
1939 [57604]: https://github.com/rust-lang/rust/pull/57604/
1940 [57367]: https://github.com/rust-lang/rust/pull/57367/
1941 [57407]: https://github.com/rust-lang/rust/pull/57407/
1942 [57425]: https://github.com/rust-lang/rust/pull/57425/
1943 [57106]: https://github.com/rust-lang/rust/pull/57106/
1944 [56470]: https://github.com/rust-lang/rust/pull/56470/
1945 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1946 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1947 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1948 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1949 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1950 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1951 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1952 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1953 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1954 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1955 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1956 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1957 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1958 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1959 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1960 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1961 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1962 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1963 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1964 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1965 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1966 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1967 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1968 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1969 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1970 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1971 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1972 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1973 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1974 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1975 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1978 Version 1.33.0 (2019-02-28)
1979 ==========================
1983 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1984 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1985 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1986 E.g. You can have match statement on a `u8` that covers `0..=255` and
1987 you would no longer be required to have a `_ => unreachable!()` case.
1988 - [You can now have multiple patterns in `if let` and `while let`
1989 expressions.][57532] You can do this with the same syntax as a `match`
1999 let state = Creature::Crab("Ferris");
2001 if let Creature::Crab(name) | Creature::Person(name) = state {
2002 println!("This creature's name is: {}", name);
2006 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
2007 this feature will by default produce a warning as this behaviour can be
2008 unintuitive. E.g. `if let _ = 5 {}`
2009 - [You can now use `let` bindings, assignments, expression statements,
2010 and irrefutable pattern destructuring in const functions.][57175]
2011 - [You can now call unsafe const functions.][57067] E.g.
2013 const unsafe fn foo() -> i32 { 5 }
2014 const fn bar() -> i32 {
2018 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
2019 E.g. `#[cfg_attr(all(), must_use, optimize)]`
2020 - [You can now specify a specific alignment with the `#[repr(packed)]`
2021 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
2022 with an alignment of 2 bytes and a size of 6 bytes.
2023 - [You can now import an item from a module as an `_`.][56303] This allows you to
2024 import a trait's impls, and not have the name in the namespace. E.g.
2026 use std::io::Read as _;
2028 // Allowed as there is only one `Read` in the module.
2031 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
2035 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
2036 command line argument.][56351]
2037 - [The minimum required LLVM version has been bumped to 6.0.][56642]
2038 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
2039 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
2040 tier 2 support.][57130] Visit the [platform support][platform-support] page for
2041 information on Rust's platform support.
2042 - [Added support for the `thumbv7neon-linux-androideabi` and
2043 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
2044 - [Added support for the `x86_64-unknown-uefi` target.][56769]
2048 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
2049 functions for all numeric types.][57566]
2050 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
2051 are now `const` functions for all numeric types.][57105]
2052 - [The methods `is_positive` and `is_negative` are now `const` functions for
2053 all signed numeric types.][57105]
2054 - [The `get` method for all `NonZero` types is now `const`.][57167]
2055 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
2056 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
2057 numeric types.][57234]
2058 - [`Ipv4Addr::new` is now a `const` function][57234]
2062 - [`unix::FileExt::read_exact_at`]
2063 - [`unix::FileExt::write_all_at`]
2064 - [`Option::transpose`]
2065 - [`Result::transpose`]
2066 - [`convert::identity`]
2069 - [`marker::PhantomPinned`]
2070 - [`Vec::resize_with`]
2071 - [`VecDeque::resize_with`]
2072 - [`Duration::as_millis`]
2073 - [`Duration::as_micros`]
2074 - [`Duration::as_nanos`]
2079 - [You can now publish crates that require a feature flag to compile with
2080 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
2081 - [Cargo should now rebuild a crate if a file was modified during the initial
2086 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
2087 are now deprecated in the standard library, and their usage will now produce a warning.
2088 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
2090 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
2092 - [Libtest no longer creates a new thread for each test when
2093 `--test-threads=1`. It also runs the tests in deterministic order][56243]
2095 [55982]: https://github.com/rust-lang/rust/pull/55982/
2096 [56243]: https://github.com/rust-lang/rust/pull/56243
2097 [56303]: https://github.com/rust-lang/rust/pull/56303/
2098 [56351]: https://github.com/rust-lang/rust/pull/56351/
2099 [56362]: https://github.com/rust-lang/rust/pull/56362
2100 [56642]: https://github.com/rust-lang/rust/pull/56642/
2101 [56769]: https://github.com/rust-lang/rust/pull/56769/
2102 [56805]: https://github.com/rust-lang/rust/pull/56805
2103 [56947]: https://github.com/rust-lang/rust/pull/56947/
2104 [57049]: https://github.com/rust-lang/rust/pull/57049/
2105 [57067]: https://github.com/rust-lang/rust/pull/57067/
2106 [57105]: https://github.com/rust-lang/rust/pull/57105
2107 [57130]: https://github.com/rust-lang/rust/pull/57130/
2108 [57167]: https://github.com/rust-lang/rust/pull/57167/
2109 [57175]: https://github.com/rust-lang/rust/pull/57175/
2110 [57234]: https://github.com/rust-lang/rust/pull/57234/
2111 [57332]: https://github.com/rust-lang/rust/pull/57332/
2112 [57465]: https://github.com/rust-lang/rust/pull/57465/
2113 [57532]: https://github.com/rust-lang/rust/pull/57532/
2114 [57535]: https://github.com/rust-lang/rust/pull/57535/
2115 [57566]: https://github.com/rust-lang/rust/pull/57566/
2116 [57615]: https://github.com/rust-lang/rust/pull/57615/
2117 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
2118 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
2119 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
2120 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
2121 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
2122 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
2123 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
2124 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
2125 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
2126 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
2127 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
2128 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
2129 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
2130 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
2131 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
2132 [platform-support]: https://forge.rust-lang.org/platform-support.html
2134 Version 1.32.0 (2019-01-17)
2135 ==========================
2140 - [You can now use the `?` operator in macro definitions.][56245] The `?`
2141 operator allows you to specify zero or one repetitions similar to the `*` and
2143 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
2144 now always resolve to the item (`enum`, `struct`, etc.) available in the
2145 module if present, before resolving to a external crate or an item the prelude.][56759]
2148 enum Color { Red, Green, Blue }
2154 - [You can now match against `PhantomData<T>` types.][55837]
2155 - [You can now match against literals in macros with the `literal`
2156 specifier.][56072] This will match against a literal of any type.
2157 E.g. `1`, `'A'`, `"Hello World"`
2158 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
2160 struct Point(i32, i32);
2163 pub fn new(x: i32, y: i32) -> Self {
2167 pub fn is_origin(&self) -> bool {
2175 - [Self can also now be used in type definitions.][56366] E.g.
2179 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
2182 Cons(T, Box<Self>) // likewise here
2185 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
2186 a `impl Trait` or `dyn Trait` is returned and unused in the program.
2190 - [The default allocator has changed from jemalloc to the default allocator on
2191 your system.][55238] The compiler itself on Linux & macOS will still use
2192 jemalloc, but programs compiled with it will use the system allocator.
2193 - [Added the `aarch64-pc-windows-msvc` target.][55702]
2197 - [`PathBuf` now implements `FromStr`.][55148]
2198 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
2199 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
2200 easily debug expressions in your rust program. E.g.
2203 let b = dbg!(a * 2) + 1;
2204 // ^-- prints: [src/main.rs:4] a * 2 = 4
2208 The following APIs are now `const` functions and can be used in a
2212 - [`UnsafeCell::get`]
2213 - [`char::is_ascii`]
2215 - [`ManuallyDrop::new`]
2216 - [`ManuallyDrop::into_inner`]
2217 - [`RangeInclusive::start`]
2218 - [`RangeInclusive::end`]
2219 - [`NonNull::as_ptr`]
2222 - [`Duration::as_secs`]
2223 - [`Duration::subsec_millis`]
2224 - [`Duration::subsec_micros`]
2225 - [`Duration::subsec_nanos`]
2227 - [`Ipv4Addr::is_unspecified`]
2229 - [`Ipv6Addr::octets`]
2233 - [`i8::to_be_bytes`]
2234 - [`i8::to_le_bytes`]
2235 - [`i8::to_ne_bytes`]
2236 - [`i8::from_be_bytes`]
2237 - [`i8::from_le_bytes`]
2238 - [`i8::from_ne_bytes`]
2239 - [`i16::to_be_bytes`]
2240 - [`i16::to_le_bytes`]
2241 - [`i16::to_ne_bytes`]
2242 - [`i16::from_be_bytes`]
2243 - [`i16::from_le_bytes`]
2244 - [`i16::from_ne_bytes`]
2245 - [`i32::to_be_bytes`]
2246 - [`i32::to_le_bytes`]
2247 - [`i32::to_ne_bytes`]
2248 - [`i32::from_be_bytes`]
2249 - [`i32::from_le_bytes`]
2250 - [`i32::from_ne_bytes`]
2251 - [`i64::to_be_bytes`]
2252 - [`i64::to_le_bytes`]
2253 - [`i64::to_ne_bytes`]
2254 - [`i64::from_be_bytes`]
2255 - [`i64::from_le_bytes`]
2256 - [`i64::from_ne_bytes`]
2257 - [`i128::to_be_bytes`]
2258 - [`i128::to_le_bytes`]
2259 - [`i128::to_ne_bytes`]
2260 - [`i128::from_be_bytes`]
2261 - [`i128::from_le_bytes`]
2262 - [`i128::from_ne_bytes`]
2263 - [`isize::to_be_bytes`]
2264 - [`isize::to_le_bytes`]
2265 - [`isize::to_ne_bytes`]
2266 - [`isize::from_be_bytes`]
2267 - [`isize::from_le_bytes`]
2268 - [`isize::from_ne_bytes`]
2269 - [`u8::to_be_bytes`]
2270 - [`u8::to_le_bytes`]
2271 - [`u8::to_ne_bytes`]
2272 - [`u8::from_be_bytes`]
2273 - [`u8::from_le_bytes`]
2274 - [`u8::from_ne_bytes`]
2275 - [`u16::to_be_bytes`]
2276 - [`u16::to_le_bytes`]
2277 - [`u16::to_ne_bytes`]
2278 - [`u16::from_be_bytes`]
2279 - [`u16::from_le_bytes`]
2280 - [`u16::from_ne_bytes`]
2281 - [`u32::to_be_bytes`]
2282 - [`u32::to_le_bytes`]
2283 - [`u32::to_ne_bytes`]
2284 - [`u32::from_be_bytes`]
2285 - [`u32::from_le_bytes`]
2286 - [`u32::from_ne_bytes`]
2287 - [`u64::to_be_bytes`]
2288 - [`u64::to_le_bytes`]
2289 - [`u64::to_ne_bytes`]
2290 - [`u64::from_be_bytes`]
2291 - [`u64::from_le_bytes`]
2292 - [`u64::from_ne_bytes`]
2293 - [`u128::to_be_bytes`]
2294 - [`u128::to_le_bytes`]
2295 - [`u128::to_ne_bytes`]
2296 - [`u128::from_be_bytes`]
2297 - [`u128::from_le_bytes`]
2298 - [`u128::from_ne_bytes`]
2299 - [`usize::to_be_bytes`]
2300 - [`usize::to_le_bytes`]
2301 - [`usize::to_ne_bytes`]
2302 - [`usize::from_be_bytes`]
2303 - [`usize::from_le_bytes`]
2304 - [`usize::from_ne_bytes`]
2308 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2309 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2313 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2317 - [The argument types for AVX's
2318 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2319 been changed from `*const` to `*mut` as the previous implementation
2323 [55148]: https://github.com/rust-lang/rust/pull/55148/
2324 [55238]: https://github.com/rust-lang/rust/pull/55238/
2325 [55280]: https://github.com/rust-lang/rust/pull/55280/
2326 [55610]: https://github.com/rust-lang/rust/pull/55610/
2327 [55663]: https://github.com/rust-lang/rust/pull/55663/
2328 [55702]: https://github.com/rust-lang/rust/pull/55702/
2329 [55837]: https://github.com/rust-lang/rust/pull/55837/
2330 [55843]: https://github.com/rust-lang/rust/pull/55843/
2331 [56072]: https://github.com/rust-lang/rust/pull/56072/
2332 [56245]: https://github.com/rust-lang/rust/pull/56245/
2333 [56365]: https://github.com/rust-lang/rust/pull/56365/
2334 [56366]: https://github.com/rust-lang/rust/pull/56366/
2335 [56395]: https://github.com/rust-lang/rust/pull/56395/
2336 [56759]: https://github.com/rust-lang/rust/pull/56759/
2337 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2338 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2339 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2340 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2341 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2342 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2343 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2344 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2345 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2346 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2347 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2348 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2349 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2350 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2351 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2352 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2353 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2354 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2355 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2356 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2357 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2358 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2359 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2360 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2361 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2362 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2363 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2364 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2365 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2366 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2367 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2368 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2369 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2370 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2371 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2372 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2373 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2374 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2375 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2376 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2377 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2378 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2379 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2380 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2381 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2382 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2383 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2384 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2385 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2386 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2387 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2388 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2389 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2390 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2391 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2392 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2393 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2394 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2395 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2396 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2397 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2398 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2399 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2400 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2401 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2402 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2403 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2404 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2405 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2406 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2407 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2408 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2409 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2410 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2411 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2412 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2413 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2414 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2415 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2416 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2417 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2418 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2419 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2420 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2421 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2422 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2423 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2424 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2425 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2426 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2427 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2428 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2429 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2432 Version 1.31.1 (2018-12-20)
2433 ===========================
2435 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2436 - [Fix broken go-to-definition in RLS][rls/1171]
2437 - [Fix infinite loop on hover in RLS][rls/1170]
2439 [56562]: https://github.com/rust-lang/rust/pull/56562
2440 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2441 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2443 Version 1.31.0 (2018-12-06)
2444 ==========================
2448 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2449 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2450 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2451 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2453 - [You can now define and use `const` functions.][54835] These are currently
2454 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2455 [language reference][const-reference] for what exactly is available.
2456 - [You can now use tool lints, which allow you to scope lints from external
2457 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2458 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2459 a crate, not just in exported functions.][54451]
2460 - [You can now use parentheses in pattern matches.][54497]
2464 - [Updated musl to 1.1.20][54430]
2468 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2469 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2470 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2471 into `Option<&mut T>` using the `From` trait.][53218]
2472 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2477 - [`slice::align_to`]
2478 - [`slice::align_to_mut`]
2479 - [`slice::chunks_exact`]
2480 - [`slice::chunks_exact_mut`]
2481 - [`slice::rchunks`]
2482 - [`slice::rchunks_mut`]
2483 - [`slice::rchunks_exact`]
2484 - [`slice::rchunks_exact_mut`]
2485 - [`Option::replace`]
2489 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2490 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2491 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2493 [52813]: https://github.com/rust-lang/rust/pull/52813/
2494 [53218]: https://github.com/rust-lang/rust/pull/53218/
2495 [53555]: https://github.com/rust-lang/rust/issues/53555/
2496 [54057]: https://github.com/rust-lang/rust/pull/54057/
2497 [54240]: https://github.com/rust-lang/rust/pull/54240/
2498 [54430]: https://github.com/rust-lang/rust/pull/54430/
2499 [54451]: https://github.com/rust-lang/rust/pull/54451/
2500 [54497]: https://github.com/rust-lang/rust/pull/54497/
2501 [54778]: https://github.com/rust-lang/rust/pull/54778/
2502 [54835]: https://github.com/rust-lang/rust/pull/54835/
2503 [54870]: https://github.com/rust-lang/rust/pull/54870/
2504 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2505 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2506 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2507 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2508 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2509 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2510 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2511 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2512 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2513 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2514 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2515 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2516 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2517 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2519 Version 1.30.1 (2018-11-08)
2520 ===========================
2522 - [Fixed overflow ICE in rustdoc][54199]
2523 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2525 [54199]: https://github.com/rust-lang/rust/pull/54199
2526 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2528 Version 1.30.0 (2018-10-25)
2529 ==========================
2533 - [Procedural macros are now available.][52081] These kinds of macros allow for
2534 more powerful code generation. There is a [new chapter available][proc-macros]
2535 in the Rust Programming Language book that goes further in depth.
2536 - [You can now use keywords as identifiers using the raw identifiers
2537 syntax (`r#`),][53236] e.g. `let r#for = true;`
2538 - [Using anonymous parameters in traits is now deprecated with a warning and
2539 will be a hard error in the 2018 edition.][53272]
2540 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2541 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2542 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2543 Previously, using a external crate in a module without a use statement
2544 required `let json = ::serde_json::from_str(foo);` but can now be written
2545 as `let json = serde_json::from_str(foo);`.
2546 - [You can now apply the `#[used]` attribute to static items to prevent the
2547 compiler from optimising them away, even if they appear to be unused,][51363]
2548 e.g. `#[used] static FOO: u32 = 1;`
2549 - [You can now import and reexport macros from other crates with the `use`
2550 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2551 the root module of the crate. If your macro relies on calling other local
2552 macros, it is recommended to export with the
2553 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2555 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2556 using the `vis` specifier.][53370]
2557 - [Non-macro attributes now allow all forms of literals, not just
2558 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2559 write `#[attr(true)]`.
2560 - [You can now specify a function to handle a panic in the Rust runtime with the
2561 `#[panic_handler]` attribute.][51366]
2565 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2566 - [Added the `aarch64-unknown-netbsd` target][53165]
2567 - [Upgraded to LLVM 8.][53611]
2571 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2575 - [`Ipv4Addr::BROADCAST`]
2576 - [`Ipv4Addr::LOCALHOST`]
2577 - [`Ipv4Addr::UNSPECIFIED`]
2578 - [`Ipv6Addr::LOCALHOST`]
2579 - [`Ipv6Addr::UNSPECIFIED`]
2580 - [`Iterator::find_map`]
2582 The following methods are replacement methods for `trim_left`, `trim_right`,
2583 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2585 - [`str::trim_end_matches`]
2587 - [`str::trim_start_matches`]
2588 - [`str::trim_start`]
2592 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2593 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2594 equivalent to calling `rustdoc --error-format=json`.
2595 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2599 - [`rustdoc` allows you to specify what edition to treat your code as with the
2600 `--edition` option.][54057]
2601 - [`rustdoc` now has the `--color` (specify whether to output color) and
2602 `--error-format` (specify error format, e.g. `json`) options.][53003]
2603 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2604 debug symbols.][53774]
2605 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2606 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2608 [50911]: https://github.com/rust-lang/rust/pull/50911/
2609 [51363]: https://github.com/rust-lang/rust/pull/51363/
2610 [51366]: https://github.com/rust-lang/rust/pull/51366/
2611 [52081]: https://github.com/rust-lang/rust/pull/52081/
2612 [53003]: https://github.com/rust-lang/rust/pull/53003/
2613 [53033]: https://github.com/rust-lang/rust/pull/53033/
2614 [53044]: https://github.com/rust-lang/rust/pull/53044/
2615 [53165]: https://github.com/rust-lang/rust/pull/53165/
2616 [53611]: https://github.com/rust-lang/rust/pull/53611/
2617 [53213]: https://github.com/rust-lang/rust/pull/53213/
2618 [53236]: https://github.com/rust-lang/rust/pull/53236/
2619 [53272]: https://github.com/rust-lang/rust/pull/53272/
2620 [53370]: https://github.com/rust-lang/rust/pull/53370/
2621 [53459]: https://github.com/rust-lang/rust/pull/53459/
2622 [53774]: https://github.com/rust-lang/rust/pull/53774/
2623 [53822]: https://github.com/rust-lang/rust/pull/53822/
2624 [54057]: https://github.com/rust-lang/rust/pull/54057/
2625 [54146]: https://github.com/rust-lang/rust/pull/54146/
2626 [54404]: https://github.com/rust-lang/rust/pull/54404/
2627 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2628 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2629 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2630 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2632 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2633 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2634 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2635 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2636 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2637 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2638 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2639 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2640 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2641 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2644 Version 1.29.2 (2018-10-11)
2645 ===========================
2647 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2648 - The `rls-preview` component on the windows-gnu targets has been restored.
2650 [54639]: https://github.com/rust-lang/rust/pull/54639
2653 Version 1.29.1 (2018-09-25)
2654 ===========================
2659 - The standard library's `str::repeat` function contained an out of bounds write
2660 caused by an integer overflow. This has been fixed by deterministically
2661 panicking when an overflow happens.
2663 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2667 Version 1.29.0 (2018-09-13)
2668 ==========================
2672 - [Bumped minimum LLVM version to 5.0.][51899]
2673 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2674 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2675 - [Upgraded to LLVM 7.][51966]
2679 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2680 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2681 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2682 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2684 - [`Cell<T>` now allows `T` to be unsized.][50494]
2685 - [`SocketAddr` is now stable on Redox.][52656]
2690 - [`Iterator::flatten`]
2695 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2696 `--locked` to disable this behavior.
2697 - [`cargo-install` will now allow you to cross compile an install
2698 using `--target`.][cargo/5614]
2699 - [Added the `cargo-fix` subcommand to automatically move project code from
2700 2015 edition to 2018.][cargo/5723]
2701 - [`cargo doc` can now optionally document private types using the
2702 `--document-private-items` flag.][cargo/5543]
2706 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2707 the specified level to that level.][52354] For example `--cap-lints warn`
2708 will demote `deny` and `forbid` lints to `warn`.
2709 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2710 fails and `101` if there is a panic.][52197]
2711 - [A preview of clippy has been made available through rustup.][51122]
2712 You can install the preview with `rustup component add clippy-preview`.
2716 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2717 Use `str::get_unchecked(begin..end)` instead.
2718 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2719 Consider using the `home_dir` function from
2720 https://crates.io/crates/dirs instead.
2721 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2722 - [`cfg` attributes and `--cfg` command line flags are now more
2723 strictly validated.][53893]
2725 [53893]: https://github.com/rust-lang/rust/pull/53893/
2726 [52861]: https://github.com/rust-lang/rust/pull/52861/
2727 [51966]: https://github.com/rust-lang/rust/pull/51966/
2728 [52656]: https://github.com/rust-lang/rust/pull/52656/
2729 [52239]: https://github.com/rust-lang/rust/pull/52239/
2730 [52330]: https://github.com/rust-lang/rust/pull/52330/
2731 [52354]: https://github.com/rust-lang/rust/pull/52354/
2732 [52402]: https://github.com/rust-lang/rust/pull/52402/
2733 [52103]: https://github.com/rust-lang/rust/pull/52103/
2734 [52197]: https://github.com/rust-lang/rust/pull/52197/
2735 [51807]: https://github.com/rust-lang/rust/pull/51807/
2736 [51899]: https://github.com/rust-lang/rust/pull/51899/
2737 [51912]: https://github.com/rust-lang/rust/pull/51912/
2738 [51511]: https://github.com/rust-lang/rust/pull/51511/
2739 [51619]: https://github.com/rust-lang/rust/pull/51619/
2740 [51656]: https://github.com/rust-lang/rust/pull/51656/
2741 [51178]: https://github.com/rust-lang/rust/pull/51178/
2742 [51122]: https://github.com/rust-lang/rust/pull/51122
2743 [50494]: https://github.com/rust-lang/rust/pull/50494/
2744 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2745 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2746 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2747 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2748 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2749 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2750 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2753 Version 1.28.0 (2018-08-02)
2754 ===========================
2758 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2759 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2760 the inner type across Foreign Function Interface (FFI) boundaries.
2761 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2762 and can now be used as identifiers.][51196]
2763 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2764 stable.][51241] This will allow users to specify a global allocator for
2766 - [Unit test functions marked with the `#[test]` attribute can now return
2767 `Result<(), E: Debug>` in addition to `()`.][51298]
2768 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2769 allows macros to easily target lifetimes.
2773 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2774 prioritise making smaller binary sizes. `z` is the same as `s` with the
2775 exception that it does not vectorise loops, which typically results in an even
2777 - [The short error format is now stable.][49546] Specified with
2778 `--error-format=short` this option will provide a more compressed output of
2779 rust error messages.
2780 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2781 - [Reduced the number of allocations in the macro parser.][50855] This can
2782 improve compile times of macro heavy crates on average by 5%.
2786 - [Implemented `Default` for `&mut str`.][51306]
2787 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2788 - [Implemented `Extend` for `()`.][50234]
2789 - [The `Debug` implementation of `time::Duration` should now be more easily
2790 human readable.][50364] Previously a `Duration` of one second would printed as
2791 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2792 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2793 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2794 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2795 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2796 for `PathBuf`.][50170]
2797 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2798 and `Wrapping<i128>`.][50465]
2799 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2800 possible.][51050] This can provide up to a 40% speed increase.
2801 - [Improved error messages when using `format!`.][50610]
2805 - [`Iterator::step_by`]
2806 - [`Path::ancestors`]
2807 - [`SystemTime::UNIX_EPOCH`]
2808 - [`alloc::GlobalAlloc`]
2810 - [`alloc::LayoutErr`]
2813 - [`alloc::alloc_zeroed`]
2814 - [`alloc::dealloc`]
2815 - [`alloc::realloc`]
2816 - [`alloc::handle_alloc_error`]
2817 - [`btree_map::Entry::or_default`]
2818 - [`fmt::Alignment`]
2819 - [`hash_map::Entry::or_default`]
2820 - [`iter::repeat_with`]
2821 - [`num::NonZeroUsize`]
2822 - [`num::NonZeroU128`]
2823 - [`num::NonZeroU16`]
2824 - [`num::NonZeroU32`]
2825 - [`num::NonZeroU64`]
2826 - [`num::NonZeroU8`]
2827 - [`ops::RangeBounds`]
2828 - [`slice::SliceIndex`]
2829 - [`slice::from_mut`]
2830 - [`slice::from_ref`]
2831 - [`{Any + Send + Sync}::downcast_mut`]
2832 - [`{Any + Send + Sync}::downcast_ref`]
2833 - [`{Any + Send + Sync}::is`]
2837 - [Cargo will now no longer allow you to publish crates with build scripts that
2838 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2839 considered to be immutable.
2843 - [The `suggestion_applicability` field in `rustc`'s json output is now
2844 stable.][50486] This will allow dev tools to check whether a code suggestion
2845 would apply to them.
2849 - [Rust will consider trait objects with duplicated constraints to be the same
2850 type as without the duplicated constraint.][51276] For example the below code will
2851 now fail to compile.
2856 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2859 impl Trait + Send + Send {
2860 fn test(&self) { println!("two"); }
2864 [49546]: https://github.com/rust-lang/rust/pull/49546/
2865 [50143]: https://github.com/rust-lang/rust/pull/50143/
2866 [50170]: https://github.com/rust-lang/rust/pull/50170/
2867 [50234]: https://github.com/rust-lang/rust/pull/50234/
2868 [50265]: https://github.com/rust-lang/rust/pull/50265/
2869 [50364]: https://github.com/rust-lang/rust/pull/50364/
2870 [50385]: https://github.com/rust-lang/rust/pull/50385/
2871 [50465]: https://github.com/rust-lang/rust/pull/50465/
2872 [50486]: https://github.com/rust-lang/rust/pull/50486/
2873 [50554]: https://github.com/rust-lang/rust/pull/50554/
2874 [50610]: https://github.com/rust-lang/rust/pull/50610/
2875 [50855]: https://github.com/rust-lang/rust/pull/50855/
2876 [51050]: https://github.com/rust-lang/rust/pull/51050/
2877 [51196]: https://github.com/rust-lang/rust/pull/51196/
2878 [51200]: https://github.com/rust-lang/rust/pull/51200/
2879 [51241]: https://github.com/rust-lang/rust/pull/51241/
2880 [51276]: https://github.com/rust-lang/rust/pull/51276/
2881 [51298]: https://github.com/rust-lang/rust/pull/51298/
2882 [51306]: https://github.com/rust-lang/rust/pull/51306/
2883 [51562]: https://github.com/rust-lang/rust/pull/51562/
2884 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2885 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2886 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2887 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2888 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2889 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2890 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2891 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2892 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2893 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2894 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2895 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2896 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2897 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2898 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2899 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2900 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2901 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2902 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2903 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2904 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2905 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2906 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2907 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2908 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2909 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2910 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2911 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2912 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2913 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2915 Version 1.27.2 (2018-07-20)
2916 ===========================
2921 - The borrow checker was fixed to avoid potential unsoundness when using
2922 match ergonomics: [#52213][52213].
2924 [52213]: https://github.com/rust-lang/rust/issues/52213
2926 Version 1.27.1 (2018-07-10)
2927 ===========================
2932 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2933 when running, which enabled executing code as some other user on a
2934 given machine. This release fixes that vulnerability; you can read
2935 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2937 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2942 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2943 match ergonomics: [#51415][51415], [#49534][49534].
2945 [51415]: https://github.com/rust-lang/rust/issues/51415
2946 [49534]: https://github.com/rust-lang/rust/issues/49534
2947 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2948 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2950 Version 1.27.0 (2018-06-21)
2951 ==========================
2955 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2956 be used as an identifier.
2957 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2958 bare `Trait` syntax, and should make it clearer when being used in tandem with
2959 `impl Trait` because it is equivalent to the following syntax:
2960 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2961 `Box<Trait> == Box<dyn Trait>`.
2962 - [Attributes on generic parameters such as types and lifetimes are
2963 now stable.][48851] e.g.
2964 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2965 - [The `#[must_use]` attribute can now also be used on functions as well as
2966 types.][48925] It provides a lint that by default warns users when the
2967 value returned by a function has not been used.
2971 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2975 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2976 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2977 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2978 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2979 the `cfg` attribute.
2980 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2981 std are now available in core.][49896]
2982 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2984 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2985 that the operation isn't done in place.
2986 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2987 the `#[must_use]` attribute][49533] to warn about unused potentially
2988 expensive allocations.
2992 - [`DoubleEndedIterator::rfind`]
2993 - [`DoubleEndedIterator::rfold`]
2994 - [`DoubleEndedIterator::try_rfold`]
2995 - [`Duration::from_micros`]
2996 - [`Duration::from_nanos`]
2997 - [`Duration::subsec_micros`]
2998 - [`Duration::subsec_millis`]
2999 - [`HashMap::remove_entry`]
3000 - [`Iterator::try_fold`]
3001 - [`Iterator::try_for_each`]
3003 - [`Option::filter`]
3004 - [`String::replace_range`]
3005 - [`Take::set_limit`]
3006 - [`hint::unreachable_unchecked`]
3007 - [`os::unix::process::parent_id`]
3008 - [`ptr::swap_nonoverlapping`]
3009 - [`slice::rsplit_mut`]
3011 - [`slice::swap_with_slice`]
3015 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
3016 `readme`, and `repository` fields.][cargo/5386]
3017 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
3018 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
3019 a different directory than `target` for placing compilation artifacts.
3020 - [Cargo will be adding automatic target inference for binaries, benchmarks,
3021 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
3022 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
3023 where cargo would infer a binary, Cargo will produce a warning. You can
3024 disable this feature ahead of time by setting any of the following to false:
3025 `autobins`, `autobenches`, `autoexamples`, `autotests`.
3026 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
3027 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
3031 - [Added “The Rustc book” into the official documentation.][49707]
3032 [“The Rustc book”] documents and teaches how to use the rustc compiler.
3033 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
3037 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
3038 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
3039 compile, `"".is_empty()` will still compile.
3040 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
3041 will only print the inner type.][48553] E.g.
3042 `print!("{:?}", AtomicBool::new(true))` will print `true`,
3043 not `AtomicBool(true)`.
3044 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
3045 could enter higher numbers but they were not supported by LLVM. Up to 512MB
3046 alignment should cover all use cases.
3047 - The `.description()` method on the `std::error::Error` trait
3048 [has been soft-deprecated][50163]. It is no longer required to implement it.
3050 [48553]: https://github.com/rust-lang/rust/pull/48553/
3051 [48851]: https://github.com/rust-lang/rust/pull/48851/
3052 [48925]: https://github.com/rust-lang/rust/pull/48925/
3053 [49533]: https://github.com/rust-lang/rust/pull/49533/
3054 [49623]: https://github.com/rust-lang/rust/pull/49623/
3055 [49630]: https://github.com/rust-lang/rust/pull/49630/
3056 [49664]: https://github.com/rust-lang/rust/pull/49664/
3057 [49699]: https://github.com/rust-lang/rust/pull/49699/
3058 [49707]: https://github.com/rust-lang/rust/pull/49707/
3059 [49719]: https://github.com/rust-lang/rust/pull/49719/
3060 [49896]: https://github.com/rust-lang/rust/pull/49896/
3061 [49968]: https://github.com/rust-lang/rust/pull/49968/
3062 [50163]: https://github.com/rust-lang/rust/pull/50163
3063 [50177]: https://github.com/rust-lang/rust/pull/50177/
3064 [50378]: https://github.com/rust-lang/rust/pull/50378/
3065 [50398]: https://github.com/rust-lang/rust/pull/50398/
3066 [50423]: https://github.com/rust-lang/rust/pull/50423/
3067 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
3068 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
3069 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
3070 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
3071 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
3072 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
3073 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
3074 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
3075 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
3076 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
3077 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
3078 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3079 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3080 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
3081 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
3082 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
3083 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
3084 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
3085 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
3086 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
3087 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
3088 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
3089 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3090 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
3091 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
3092 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
3093 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
3094 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
3095 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
3096 [“The Rustc book”]: https://doc.rust-lang.org/rustc
3099 Version 1.26.2 (2018-06-05)
3100 ==========================
3105 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
3107 [51117]: https://github.com/rust-lang/rust/issues/51117
3110 Version 1.26.1 (2018-05-29)
3111 ==========================
3116 - [RLS now works on Windows.][50646]
3117 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
3123 - [`fn main() -> impl Trait` no longer works for non-Termination
3125 This reverts an accidental stabilization.
3126 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
3127 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
3129 [50646]: https://github.com/rust-lang/rust/issues/50646
3130 [50656]: https://github.com/rust-lang/rust/pull/50656
3131 [50812]: https://github.com/rust-lang/rust/pull/50812
3132 [50950]: https://github.com/rust-lang/rust/issues/50950
3133 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
3135 Version 1.26.0 (2018-05-10)
3136 ==========================
3140 - [Closures now implement `Copy` and/or `Clone` if all captured variables
3141 implement either or both traits.][49299]
3142 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
3143 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
3144 lifetime can be elided.][49458]
3145 - [`impl Trait` is now stable allowing you to have abstract types in returns
3146 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
3147 `fn open(path: impl AsRef<Path>)`.
3148 - [Pattern matching will now automatically apply dereferences.][49394]
3149 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
3150 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
3151 - [A lot of operations are now available in a const context.][46882] E.g. You
3152 can now index into constant arrays, reference and dereference into constants,
3153 and use tuple struct constructors.
3154 - [Fixed entry slice patterns are now stable.][48516] E.g.
3156 let points = [1, 2, 3, 4];
3158 [1, 2, 3, 4] => println!("All points were sequential."),
3159 _ => println!("Not all points were sequential."),
3166 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
3167 - [Fixed exponential projection complexity on nested types.][48296]
3168 This can provide up to a ~12% reduction in compile times for certain crates.
3169 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
3170 to remap path prefixes outputted by the compiler.
3171 - [Added `powerpc-unknown-netbsd` target.][48281]
3175 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
3176 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
3177 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
3178 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
3179 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
3180 - [`ascii::escape_default` is now available in libcore.][48735]
3181 - [Trailing commas are now supported in std and core macros.][48056]
3182 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
3183 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
3188 - [`*const T::copy_to_nonoverlapping`]
3189 - [`*const T::copy_to`]
3190 - [`*const T::read_unaligned`]
3191 - [`*const T::read_volatile`]
3192 - [`*const T::read`]
3194 - [`*const T::wrapping_add`]
3195 - [`*const T::wrapping_sub`]
3197 - [`*mut T::copy_to_nonoverlapping`]
3198 - [`*mut T::copy_to`]
3199 - [`*mut T::read_unaligned`]
3200 - [`*mut T::read_volatile`]
3202 - [`*mut T::replace`]
3205 - [`*mut T::wrapping_add`]
3206 - [`*mut T::wrapping_sub`]
3207 - [`*mut T::write_bytes`]
3208 - [`*mut T::write_unaligned`]
3209 - [`*mut T::write_volatile`]
3212 - [`FromUtf8Error::as_bytes`]
3213 - [`LocalKey::try_with`]
3214 - [`Option::cloned`]
3215 - [`btree_map::Entry::and_modify`]
3216 - [`fs::read_to_string`]
3219 - [`hash_map::Entry::and_modify`]
3220 - [`iter::FusedIterator`]
3221 - [`ops::RangeInclusive`]
3222 - [`ops::RangeToInclusive`]
3224 - [`slice::rotate_left`]
3225 - [`slice::rotate_right`]
3226 - [`String::retain`]
3231 - [Cargo will now output path to custom commands when `-v` is
3232 passed with `--list`][cargo/5041]
3233 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
3237 - [The second edition of "The Rust Programming Language" book is now recommended
3238 over the first.][48404]
3243 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
3244 syntax is now invalid.
3246 use std::ops::Fn as dyn;
3247 fn g(_: Box<dyn(std::fmt::Debug)>) {}
3249 - [The result of dereferences are no longer promoted to `'static`.][47408]
3253 const PAIR: &(i32, i32) = &(0, 1);
3254 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
3257 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
3258 - [`".e0"` will now no longer parse as `0.0` and will instead cause
3260 - [Removed hoedown from rustdoc.][48274]
3261 - [Bounds on higher-kinded lifetimes a hard error.][48326]
3263 [46882]: https://github.com/rust-lang/rust/pull/46882
3264 [47379]: https://github.com/rust-lang/rust/pull/47379
3265 [47408]: https://github.com/rust-lang/rust/pull/47408
3266 [47813]: https://github.com/rust-lang/rust/pull/47813
3267 [48056]: https://github.com/rust-lang/rust/pull/48056
3268 [48125]: https://github.com/rust-lang/rust/pull/48125
3269 [48166]: https://github.com/rust-lang/rust/pull/48166
3270 [48235]: https://github.com/rust-lang/rust/pull/48235
3271 [48274]: https://github.com/rust-lang/rust/pull/48274
3272 [48281]: https://github.com/rust-lang/rust/pull/48281
3273 [48296]: https://github.com/rust-lang/rust/pull/48296
3274 [48326]: https://github.com/rust-lang/rust/pull/48326
3275 [48359]: https://github.com/rust-lang/rust/pull/48359
3276 [48404]: https://github.com/rust-lang/rust/pull/48404
3277 [48481]: https://github.com/rust-lang/rust/pull/48481
3278 [48516]: https://github.com/rust-lang/rust/pull/48516
3279 [48628]: https://github.com/rust-lang/rust/pull/48628
3280 [48629]: https://github.com/rust-lang/rust/pull/48629
3281 [48657]: https://github.com/rust-lang/rust/pull/48657
3282 [48735]: https://github.com/rust-lang/rust/pull/48735
3283 [48978]: https://github.com/rust-lang/rust/pull/48978
3284 [49101]: https://github.com/rust-lang/rust/pull/49101
3285 [49109]: https://github.com/rust-lang/rust/pull/49109
3286 [49121]: https://github.com/rust-lang/rust/pull/49121
3287 [49162]: https://github.com/rust-lang/rust/pull/49162
3288 [49184]: https://github.com/rust-lang/rust/pull/49184
3289 [49234]: https://github.com/rust-lang/rust/pull/49234
3290 [49255]: https://github.com/rust-lang/rust/pull/49255
3291 [49299]: https://github.com/rust-lang/rust/pull/49299
3292 [49305]: https://github.com/rust-lang/rust/pull/49305
3293 [49394]: https://github.com/rust-lang/rust/pull/49394
3294 [49458]: https://github.com/rust-lang/rust/pull/49458
3295 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3296 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3297 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3298 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3299 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3300 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3301 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3302 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3303 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3304 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3305 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3306 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3307 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3308 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3309 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3310 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3311 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3312 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3313 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3314 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3315 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3316 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3317 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3318 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3319 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3320 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3321 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3322 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3323 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3324 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3325 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3326 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3327 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3328 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3329 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3330 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3331 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3332 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3333 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3334 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3335 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3336 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3339 Version 1.25.0 (2018-03-29)
3340 ==========================
3344 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3345 - [You can now use nested groups of imports.][47948]
3346 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3347 - [You can now have `|` at the start of a match arm.][47947] e.g.
3349 enum Foo { A, B, C }
3355 | Foo::B => println!("AB"),
3356 | Foo::C => println!("C"),
3363 - [Upgraded to LLVM 6.][47828]
3364 - [Added `-C lto=val` option.][47521]
3365 - [Added `i586-unknown-linux-musl` target][47282]
3369 - [Impl Send for `process::Command` on Unix.][47760]
3370 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3371 - [`UnsafeCell::into_inner` is now safe.][47204]
3372 - [Implement libstd for CloudABI.][47268]
3373 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3374 - [Implement `AsRef<Path>` for Component][46985]
3375 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3376 - [Moved `Duration` to libcore.][46666]
3380 - [`Location::column`]
3383 The following functions can now be used in a constant expression.
3384 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3385 - [`Duration::new`][47300]
3386 - [`Duration::from_secs`][47300]
3387 - [`Duration::from_millis`][47300]
3391 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3392 - [`cargo new` now defaults to creating a binary crate, instead of a
3393 library crate.][cargo/5029]
3397 - [Rust by example is now shipped with new releases][46196]
3401 - [Deprecated `net::lookup_host`.][47510]
3402 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3403 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3404 around indexing operations (see [#47349][47349]). This has been fixed (which also
3405 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3406 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3408 [33903]: https://github.com/rust-lang/rust/pull/33903
3409 [47947]: https://github.com/rust-lang/rust/pull/47947
3410 [47948]: https://github.com/rust-lang/rust/pull/47948
3411 [47760]: https://github.com/rust-lang/rust/pull/47760
3412 [47790]: https://github.com/rust-lang/rust/pull/47790
3413 [47828]: https://github.com/rust-lang/rust/pull/47828
3414 [47398]: https://github.com/rust-lang/rust/pull/47398
3415 [47510]: https://github.com/rust-lang/rust/pull/47510
3416 [47521]: https://github.com/rust-lang/rust/pull/47521
3417 [47204]: https://github.com/rust-lang/rust/pull/47204
3418 [47251]: https://github.com/rust-lang/rust/pull/47251
3419 [47268]: https://github.com/rust-lang/rust/pull/47268
3420 [47282]: https://github.com/rust-lang/rust/pull/47282
3421 [47300]: https://github.com/rust-lang/rust/pull/47300
3422 [47349]: https://github.com/rust-lang/rust/pull/47349
3423 [46931]: https://github.com/rust-lang/rust/pull/46931
3424 [46985]: https://github.com/rust-lang/rust/pull/46985
3425 [47006]: https://github.com/rust-lang/rust/pull/47006
3426 [46830]: https://github.com/rust-lang/rust/pull/46830
3427 [46095]: https://github.com/rust-lang/rust/pull/46095
3428 [46666]: https://github.com/rust-lang/rust/pull/46666
3429 [46196]: https://github.com/rust-lang/rust/pull/46196
3430 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3431 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3432 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3433 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3434 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3437 Version 1.24.1 (2018-03-01)
3438 ==========================
3440 - [Do not abort when unwinding through FFI][48251]
3441 - [Emit UTF-16 files for linker arguments on Windows][48318]
3442 - [Make the error index generator work again][48308]
3443 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3445 [48251]: https://github.com/rust-lang/rust/issues/48251
3446 [48308]: https://github.com/rust-lang/rust/issues/48308
3447 [48318]: https://github.com/rust-lang/rust/issues/48318
3448 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3451 Version 1.24.0 (2018-02-15)
3452 ==========================
3456 - [External `sysv64` ffi is now available.][46528]
3457 eg. `extern "sysv64" fn foo () {}`
3461 - [rustc now uses 16 codegen units by default for release builds.][46910]
3462 For the fastest builds, utilize `codegen-units=1`.
3463 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3464 - [Add `aarch64-unknown-openbsd` support][46760]
3468 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3469 improvement in performance in the majority of cases.
3470 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3471 with Windows.][46798]
3472 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3473 - [impl `From<bool>` for `AtomicBool`][46293]
3474 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3475 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3476 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3477 - [float::from_bits now just uses transmute.][46012] This provides
3478 some optimisations from LLVM.
3479 - [Copied `AsciiExt` methods onto `char`][46077]
3480 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3481 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3482 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3483 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3487 - [`RefCell::replace`]
3489 - [`atomic::spin_loop_hint`]
3491 The following functions can now be used in a constant expression.
3492 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3494 - [`AtomicBool::new`][46287]
3495 - [`AtomicUsize::new`][46287]
3496 - [`AtomicIsize::new`][46287]
3497 - [`AtomicPtr::new`][46287]
3498 - [`Cell::new`][46287]
3499 - [`{integer}::min_value`][46287]
3500 - [`{integer}::max_value`][46287]
3501 - [`mem::size_of`][46287]
3502 - [`mem::align_of`][46287]
3503 - [`ptr::null`][46287]
3504 - [`ptr::null_mut`][46287]
3505 - [`RefCell::new`][46287]
3506 - [`UnsafeCell::new`][46287]
3510 - [Added a `workspace.default-members` config that
3511 overrides implied `--all` in virtual workspaces.][cargo/4743]
3512 - [Enable incremental by default on development builds.][cargo/4817] Also added
3513 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3514 per-project or global basis respectively.
3521 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3522 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3523 in accordance with IETF RFC 4291 §2.2.
3524 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3525 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3526 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3527 - [Leading zeros in tuple struct members is now an error][47084]
3528 - [`column!()` macro is one-based instead of zero-based][46977]
3529 - [`fmt::Arguments` can no longer be shared across threads][45198]
3530 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3531 - [Cargo sets a different working directory for the compiler][cargo/4788]
3533 [44884]: https://github.com/rust-lang/rust/pull/44884
3534 [45198]: https://github.com/rust-lang/rust/pull/45198
3535 [45506]: https://github.com/rust-lang/rust/pull/45506
3536 [45904]: https://github.com/rust-lang/rust/pull/45904
3537 [45990]: https://github.com/rust-lang/rust/pull/45990
3538 [46012]: https://github.com/rust-lang/rust/pull/46012
3539 [46077]: https://github.com/rust-lang/rust/pull/46077
3540 [46094]: https://github.com/rust-lang/rust/pull/46094
3541 [46284]: https://github.com/rust-lang/rust/pull/46284
3542 [46287]: https://github.com/rust-lang/rust/pull/46287
3543 [46293]: https://github.com/rust-lang/rust/pull/46293
3544 [46528]: https://github.com/rust-lang/rust/pull/46528
3545 [46671]: https://github.com/rust-lang/rust/pull/46671
3546 [46713]: https://github.com/rust-lang/rust/pull/46713
3547 [46735]: https://github.com/rust-lang/rust/pull/46735
3548 [46749]: https://github.com/rust-lang/rust/pull/46749
3549 [46760]: https://github.com/rust-lang/rust/pull/46760
3550 [46798]: https://github.com/rust-lang/rust/pull/46798
3551 [46828]: https://github.com/rust-lang/rust/pull/46828
3552 [46831]: https://github.com/rust-lang/rust/pull/46831
3553 [46833]: https://github.com/rust-lang/rust/pull/46833
3554 [46910]: https://github.com/rust-lang/rust/pull/46910
3555 [46977]: https://github.com/rust-lang/rust/pull/46977
3556 [47018]: https://github.com/rust-lang/rust/pull/47018
3557 [47080]: https://github.com/rust-lang/rust/pull/47080
3558 [47084]: https://github.com/rust-lang/rust/pull/47084
3559 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3560 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3561 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3562 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3563 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3564 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3567 Version 1.23.0 (2018-01-04)
3568 ==========================
3572 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3573 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3574 Which should fix some confusing errors in some operations.
3578 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3579 undefined behavior.][45920]
3580 - [rustc now suggests renaming import if names clash.][45660]
3581 - [Display errors/warnings correctly when there are zero-width or
3582 wide characters.][45711]
3583 - [rustc now avoids unnecessary copies of arguments that are
3584 simple bindings][45380] This should improve memory usage on average by 5-10%.
3585 - [Updated musl used to build musl rustc to 1.1.17][45393]
3589 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3590 - [Implement Hash for raw pointers to unsized types][45483]
3591 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3592 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3593 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3594 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3595 and `<*mut T>::as_mut`][44932]
3596 - [Optimized `Thread::{park, unpark}` implementation][45524]
3597 - [Improved `SliceExt::binary_search` performance.][45333]
3598 - [impl `FromIterator<()>` for `()`][45379]
3599 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3607 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3608 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3609 - [Added unit test checking to `cargo check`][cargo/4592]
3610 - [Cargo now lets you install a specific version
3611 using `cargo install --version`][cargo/4637]
3615 - [Releases now ship with the Cargo book documentation.][45692]
3616 - [rustdoc now prints rendering warnings on every run.][45324]
3620 - [Changes have been made to type equality to make it more correct,
3621 in rare cases this could break some code.][45853] [Tracking issue for
3622 further information][45852]
3623 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3624 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3625 Android 9, the minimum supported version is Android 14.
3626 - [Bumped the minimum LLVM to 3.9][45326]
3628 [44042]: https://github.com/rust-lang/rust/pull/44042
3629 [44932]: https://github.com/rust-lang/rust/pull/44932
3630 [45267]: https://github.com/rust-lang/rust/pull/45267
3631 [45324]: https://github.com/rust-lang/rust/pull/45324
3632 [45326]: https://github.com/rust-lang/rust/pull/45326
3633 [45333]: https://github.com/rust-lang/rust/pull/45333
3634 [45379]: https://github.com/rust-lang/rust/pull/45379
3635 [45380]: https://github.com/rust-lang/rust/pull/45380
3636 [45393]: https://github.com/rust-lang/rust/pull/45393
3637 [45435]: https://github.com/rust-lang/rust/pull/45435
3638 [45483]: https://github.com/rust-lang/rust/pull/45483
3639 [45524]: https://github.com/rust-lang/rust/pull/45524
3640 [45571]: https://github.com/rust-lang/rust/pull/45571
3641 [45580]: https://github.com/rust-lang/rust/pull/45580
3642 [45610]: https://github.com/rust-lang/rust/pull/45610
3643 [45660]: https://github.com/rust-lang/rust/pull/45660
3644 [45692]: https://github.com/rust-lang/rust/pull/45692
3645 [45711]: https://github.com/rust-lang/rust/pull/45711
3646 [45772]: https://github.com/rust-lang/rust/pull/45772
3647 [45852]: https://github.com/rust-lang/rust/issues/45852
3648 [45853]: https://github.com/rust-lang/rust/pull/45853
3649 [45887]: https://github.com/rust-lang/rust/pull/45887
3650 [45920]: https://github.com/rust-lang/rust/pull/45920
3651 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3652 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3653 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3656 Version 1.22.1 (2017-11-22)
3657 ==========================
3659 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3661 [46183]: https://github.com/rust-lang/rust/pull/46183
3663 Version 1.22.0 (2017-11-22)
3664 ==========================
3668 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3669 - [Now accepts underscores in unicode escapes][43716]
3670 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3671 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3675 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3676 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3677 This should decrease compile times for debug builds.
3678 - [strict memory alignment now enabled on ARMv6][45094]
3679 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3683 - [Allow atomic operations up to 32 bits
3684 on `armv5te_unknown_linux_gnueabi`][44978]
3685 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3686 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3687 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3688 - [Properly detect overflow in `Instant += Duration`.][44220]
3689 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3690 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3691 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3698 - [Cargo will now build multi file examples in subdirectories of the `examples`
3699 folder that have a `main.rs` file.][cargo/4496]
3700 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3701 the old format will continue to work and can be updated with `cargo update`.
3702 - [Now supports vendoring git repositories][cargo/3992]
3706 - [`libbacktrace` is now available on Apple platforms.][44251]
3707 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3708 This now lets you specify that a given code example will fail to compile.
3712 - [The minimum Android version that rustc can build for has been bumped
3713 to `4.0` from `2.3`][45656]
3714 - [Allowing `T op= &T` for numeric types has broken some type
3715 inference cases][45480]
3718 [42526]: https://github.com/rust-lang/rust/pull/42526
3719 [43017]: https://github.com/rust-lang/rust/pull/43017
3720 [43716]: https://github.com/rust-lang/rust/pull/43716
3721 [43949]: https://github.com/rust-lang/rust/pull/43949
3722 [44015]: https://github.com/rust-lang/rust/pull/44015
3723 [44220]: https://github.com/rust-lang/rust/pull/44220
3724 [44251]: https://github.com/rust-lang/rust/pull/44251
3725 [44287]: https://github.com/rust-lang/rust/pull/44287
3726 [44303]: https://github.com/rust-lang/rust/pull/44303
3727 [44456]: https://github.com/rust-lang/rust/pull/44456
3728 [44466]: https://github.com/rust-lang/rust/pull/44466
3729 [44895]: https://github.com/rust-lang/rust/pull/44895
3730 [44966]: https://github.com/rust-lang/rust/pull/44966
3731 [44978]: https://github.com/rust-lang/rust/pull/44978
3732 [45041]: https://github.com/rust-lang/rust/pull/45041
3733 [45064]: https://github.com/rust-lang/rust/pull/45064
3734 [45075]: https://github.com/rust-lang/rust/pull/45075
3735 [45094]: https://github.com/rust-lang/rust/pull/45094
3736 [45095]: https://github.com/rust-lang/rust/pull/45095
3737 [45480]: https://github.com/rust-lang/rust/issues/45480
3738 [45656]: https://github.com/rust-lang/rust/pull/45656
3739 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3740 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3741 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3748 Version 1.21.0 (2017-10-12)
3749 ==========================
3753 - [You can now use static references for literals.][43838]
3757 let x: &'static u32 = &0;
3760 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3763 my_macro!(Vec<i32>::new); // Always worked
3764 my_macro!(Vec::<i32>::new); // Now works
3769 - [Upgraded jemalloc to 4.5.0][43911]
3770 - [Enabled unwinding panics on Redox][43917]
3771 - [Now runs LLVM in parallel during translation phase.][43506]
3772 This should reduce peak memory usage.
3776 - [Generate builtin impls for `Clone` for all arrays and tuples that
3777 are `T: Clone`][43690]
3778 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3779 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3780 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3785 [`std::mem::discriminant`]
3789 - [You can now call `cargo install` with multiple package names][cargo/4216]
3790 - [Cargo commands inside a virtual workspace will now implicitly
3791 pass `--all`][cargo/4335]
3792 - [Added a `[patch]` section to `Cargo.toml` to handle
3793 prepublication dependencies][cargo/4123] [RFC 1969]
3794 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3795 like patterns][cargo/4270]
3796 - [Added the `--all-targets` option][cargo/4400]
3797 - [Using required dependencies as a feature is now deprecated and emits
3798 a warning][cargo/4364]
3803 - [Cargo docs are moving][43916]
3804 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3805 - [The rustdoc book is now available][43863]
3806 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3807 - [Added a preview of RLS has been made available through rustup][44204]
3808 Install with `rustup component add rls-preview`
3809 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3810 Previously only showed `std::os::unix`.
3814 - [Changes in method matching against higher-ranked types][43880] This may cause
3815 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3816 - [rustc's JSON error output's byte position start at top of file.][42973]
3817 Was previously relative to the rustc's internal `CodeMap` struct which
3818 required the unstable library `libsyntax` to correctly use.
3819 - [`unused_results` lint no longer ignores booleans][43728]
3821 [42565]: https://github.com/rust-lang/rust/pull/42565
3822 [42973]: https://github.com/rust-lang/rust/pull/42973
3823 [43348]: https://github.com/rust-lang/rust/pull/43348
3824 [43459]: https://github.com/rust-lang/rust/pull/43459
3825 [43506]: https://github.com/rust-lang/rust/pull/43506
3826 [43540]: https://github.com/rust-lang/rust/pull/43540
3827 [43690]: https://github.com/rust-lang/rust/pull/43690
3828 [43728]: https://github.com/rust-lang/rust/pull/43728
3829 [43838]: https://github.com/rust-lang/rust/pull/43838
3830 [43863]: https://github.com/rust-lang/rust/pull/43863
3831 [43880]: https://github.com/rust-lang/rust/pull/43880
3832 [43911]: https://github.com/rust-lang/rust/pull/43911
3833 [43916]: https://github.com/rust-lang/rust/pull/43916
3834 [43917]: https://github.com/rust-lang/rust/pull/43917
3835 [44204]: https://github.com/rust-lang/rust/pull/44204
3836 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3837 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3838 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3839 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3840 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3841 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3842 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3843 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3844 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3846 Version 1.20.0 (2017-08-31)
3847 ===========================
3851 - [Associated constants are now stabilised.][42809]
3852 - [A lot of macro bugs are now fixed.][42913]
3857 - [Struct fields are now properly coerced to the expected field type.][42807]
3858 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3859 `wasm32-experimental-emscripten` target.
3860 - [Changed some of the error messages to be more helpful.][42033]
3861 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3863 - [rustc now reports the total number of errors on compilation failure][43015]
3864 previously this was only the number of errors in the pass that failed.
3865 - [Expansion in rustc has been sped up 29x.][42533]
3866 - [added `msp430-none-elf` target.][43099]
3867 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3869 - [Fixes backtraces on Redox][43228]
3870 - [rustc now identifies different versions of same crate when absolute paths of
3871 different types match in an error message.][42826]
3877 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3878 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3880 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3881 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3882 - [Impl `Clone` for `DefaultHasher`.][42799]
3883 - [Impl `Sync` for `SyncSender`.][42397]
3884 - [Impl `FromStr` for `char`][42271]
3885 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3887 - [allow messages in the `unimplemented!()` macro.][42155]
3888 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3889 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3890 - [Upgrade to Unicode 10.0.0][42999]
3891 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3892 - [Skip the main thread's manual stack guard on Linux][43072]
3893 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3894 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3896 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3901 - [`CStr::into_c_string`]
3902 - [`CString::as_c_str`]
3903 - [`CString::into_boxed_c_str`]
3904 - [`Chain::get_mut`]
3905 - [`Chain::get_ref`]
3906 - [`Chain::into_inner`]
3907 - [`Option::get_or_insert_with`]
3908 - [`Option::get_or_insert`]
3909 - [`OsStr::into_os_string`]
3910 - [`OsString::into_boxed_os_str`]
3913 - [`Utf8Error::error_len`]
3914 - [`char::EscapeDebug`]
3915 - [`char::escape_debug`]
3916 - [`compile_error!`]
3917 - [`f32::from_bits`]
3919 - [`f64::from_bits`]
3921 - [`mem::ManuallyDrop`]
3922 - [`slice::sort_unstable_by_key`]
3923 - [`slice::sort_unstable_by`]
3924 - [`slice::sort_unstable`]
3925 - [`str::from_boxed_utf8_unchecked`]
3926 - [`str::as_bytes_mut`]
3927 - [`str::as_bytes_mut`]
3928 - [`str::from_utf8_mut`]
3929 - [`str::from_utf8_unchecked_mut`]
3931 - [`str::get_unchecked_mut`]
3932 - [`str::get_unchecked`]
3934 - [`str::into_boxed_bytes`]
3939 - [Cargo API token location moved from `~/.cargo/config` to
3940 `~/.cargo/credentials`.][cargo/3978]
3941 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3942 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3943 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3944 - [You can now specify version of a binary when installed through
3945 `cargo install` using `--vers`.][cargo/4229]
3946 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3947 failure.][cargo/4248]
3948 - [Changed the convention around which file is the crate root.][cargo/4259]
3949 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3950 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3955 - [Functions with `'static` in their return types will now not be as usable as
3956 if they were using lifetime parameters instead.][42417]
3957 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3958 takes the sign of NaN into account where previously didn't.][42430]
3960 [42033]: https://github.com/rust-lang/rust/pull/42033
3961 [42155]: https://github.com/rust-lang/rust/pull/42155
3962 [42271]: https://github.com/rust-lang/rust/pull/42271
3963 [42397]: https://github.com/rust-lang/rust/pull/42397
3964 [42417]: https://github.com/rust-lang/rust/pull/42417
3965 [42430]: https://github.com/rust-lang/rust/pull/42430
3966 [42431]: https://github.com/rust-lang/rust/pull/42431
3967 [42533]: https://github.com/rust-lang/rust/pull/42533
3968 [42571]: https://github.com/rust-lang/rust/pull/42571
3969 [42613]: https://github.com/rust-lang/rust/pull/42613
3970 [42799]: https://github.com/rust-lang/rust/pull/42799
3971 [42807]: https://github.com/rust-lang/rust/pull/42807
3972 [42809]: https://github.com/rust-lang/rust/pull/42809
3973 [42822]: https://github.com/rust-lang/rust/pull/42822
3974 [42826]: https://github.com/rust-lang/rust/pull/42826
3975 [42854]: https://github.com/rust-lang/rust/pull/42854
3976 [42913]: https://github.com/rust-lang/rust/pull/42913
3977 [42999]: https://github.com/rust-lang/rust/pull/42999
3978 [43011]: https://github.com/rust-lang/rust/pull/43011
3979 [43015]: https://github.com/rust-lang/rust/pull/43015
3980 [43072]: https://github.com/rust-lang/rust/pull/43072
3981 [43077]: https://github.com/rust-lang/rust/pull/43077
3982 [43097]: https://github.com/rust-lang/rust/pull/43097
3983 [43099]: https://github.com/rust-lang/rust/pull/43099
3984 [43170]: https://github.com/rust-lang/rust/pull/43170
3985 [43178]: https://github.com/rust-lang/rust/pull/43178
3986 [43185]: https://github.com/rust-lang/rust/pull/43185
3987 [43228]: https://github.com/rust-lang/rust/pull/43228
3988 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3989 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3990 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3991 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3992 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3993 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3994 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3995 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3996 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3997 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3998 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3999 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
4000 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
4001 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
4002 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
4003 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
4004 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
4005 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
4006 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
4007 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
4008 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
4009 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
4010 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
4011 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
4012 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
4013 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
4014 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
4015 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
4016 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
4017 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
4018 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
4019 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
4020 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
4021 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
4022 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
4023 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
4024 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
4025 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
4026 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
4029 Version 1.19.0 (2017-07-20)
4030 ===========================
4035 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
4036 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
4037 - [Macro recursion limit increased to 1024 from 64.][41676]
4038 - [Added lint for detecting unused macros.][41907]
4039 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
4040 For example: `let x = loop { break 7; };`
4041 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
4042 contain `Copy` types and cannot have a `Drop` implementation.
4043 Example: `union Foo { bar: u8, baz: usize }`
4044 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
4045 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
4050 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
4051 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
4052 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
4053 you should use `--target armv7-linux-androideabi`.
4054 - [Fixed ICE when removing a source file between compilation sessions.][41873]
4055 - [Minor optimisation of string operations.][42037]
4056 - [Compiler error message is now `aborting due to previous error(s)` instead of
4057 `aborting due to N previous errors`][42150] This was previously inaccurate and
4058 would only count certain kinds of errors.
4059 - [The compiler now supports Visual Studio 2017][42225]
4060 - [The compiler is now built against LLVM 4.0.1 by default][42948]
4061 - [Added a lot][42264] of [new error codes][42302]
4062 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
4063 libraries with C Run-time Libraries(CRT) to be statically linked.
4064 - [Fixed various ARM codegen bugs][42740]
4069 - [`String` now implements `FromIterator<Cow<'a, str>>` and
4070 `Extend<Cow<'a, str>>`][41449]
4071 - [`Vec` now implements `From<&mut [T]>`][41530]
4072 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
4073 - [`SplitWhitespace` now implements `Clone`][41659]
4074 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
4076 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
4077 macros, but for printing to stderr.
4082 - [`OsString::shrink_to_fit`]
4085 - [`thread::ThreadId`]
4090 - [Build scripts can now add environment variables to the environment
4091 the crate is being compiled in.
4092 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
4093 - [Subcommands now replace the current process rather than spawning a new
4094 child process][cargo/3970]
4095 - [Workspace members can now accept glob file patterns][cargo/3979]
4096 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
4097 the members in a given workspace.][cargo/3988]
4098 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
4099 - [Target directory path is now in the cargo metadata][cargo/4022]
4100 - [Cargo no longer checks out a local working directory for the
4101 crates.io index][cargo/4026] This should provide smaller file size for the
4102 registry, and improve cloning times, especially on Windows machines.
4103 - [Added an `--exclude` option for excluding certain packages when using the
4104 `--all` option][cargo/4031]
4105 - [Cargo will now automatically retry when receiving a 5xx error
4106 from crates.io][cargo/4032]
4107 - [The `--features` option now accepts multiple comma or space
4108 delimited values.][cargo/4084]
4109 - [Added support for custom target specific runners][cargo/3954]
4114 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
4116 - [Rust will now release XZ compressed packages][rust-installer/57]
4117 - [rustup will now prefer to download rust packages with
4118 XZ compression][rustup/1100] over GZip packages.
4119 - [Added the ability to escape `#` in rust documentation][41785] By adding
4120 additional `#`'s ie. `##` is now `#`
4125 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
4126 - [`-Z` flags are now no longer allowed to be used on the stable
4127 compiler.][41751] This has been a warning for a year previous to this.
4128 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
4129 longer works][42844]. Users should migrate to the built-in `check`
4130 command, which has been available since 1.16.
4131 - [Ending a float literal with `._` is now a hard error.
4132 Example: `42._` .][41946]
4133 - [Any use of a private `extern crate` outside of its module is now a
4134 hard error.][36886] This was previously a warning.
4135 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
4136 relative while the `::` prefix makes a path absolute, but was ignored and the
4137 path was relative regardless.
4138 - [Floating point constants in match patterns is now a hard error][36890]
4139 This was previously a warning.
4140 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
4141 match patterns is now a hard error][36891] This was previously a warning.
4142 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
4144 - [From the pound escape, lines consisting of multiple `#`s are
4146 - [It is an error to re-export private enum variants][42460]. This is
4147 known to break a number of crates that depend on an older version of
4149 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
4150 to use it to find the linker, and the build will fail where it did
4151 not previously][42607]
4153 [36886]: https://github.com/rust-lang/rust/issues/36886
4154 [36888]: https://github.com/rust-lang/rust/issues/36888
4155 [36890]: https://github.com/rust-lang/rust/issues/36890
4156 [36891]: https://github.com/rust-lang/rust/issues/36891
4157 [36892]: https://github.com/rust-lang/rust/issues/36892
4158 [37406]: https://github.com/rust-lang/rust/issues/37406
4159 [39983]: https://github.com/rust-lang/rust/pull/39983
4160 [41145]: https://github.com/rust-lang/rust/pull/41145
4161 [41192]: https://github.com/rust-lang/rust/pull/41192
4162 [41258]: https://github.com/rust-lang/rust/pull/41258
4163 [41370]: https://github.com/rust-lang/rust/pull/41370
4164 [41449]: https://github.com/rust-lang/rust/pull/41449
4165 [41530]: https://github.com/rust-lang/rust/pull/41530
4166 [41624]: https://github.com/rust-lang/rust/pull/41624
4167 [41656]: https://github.com/rust-lang/rust/pull/41656
4168 [41659]: https://github.com/rust-lang/rust/pull/41659
4169 [41676]: https://github.com/rust-lang/rust/pull/41676
4170 [41751]: https://github.com/rust-lang/rust/pull/41751
4171 [41764]: https://github.com/rust-lang/rust/pull/41764
4172 [41785]: https://github.com/rust-lang/rust/pull/41785
4173 [41873]: https://github.com/rust-lang/rust/pull/41873
4174 [41907]: https://github.com/rust-lang/rust/pull/41907
4175 [41946]: https://github.com/rust-lang/rust/pull/41946
4176 [42016]: https://github.com/rust-lang/rust/pull/42016
4177 [42037]: https://github.com/rust-lang/rust/pull/42037
4178 [42068]: https://github.com/rust-lang/rust/pull/42068
4179 [42150]: https://github.com/rust-lang/rust/pull/42150
4180 [42162]: https://github.com/rust-lang/rust/pull/42162
4181 [42225]: https://github.com/rust-lang/rust/pull/42225
4182 [42264]: https://github.com/rust-lang/rust/pull/42264
4183 [42302]: https://github.com/rust-lang/rust/pull/42302
4184 [42460]: https://github.com/rust-lang/rust/issues/42460
4185 [42607]: https://github.com/rust-lang/rust/issues/42607
4186 [42740]: https://github.com/rust-lang/rust/pull/42740
4187 [42844]: https://github.com/rust-lang/rust/issues/42844
4188 [42948]: https://github.com/rust-lang/rust/pull/42948
4189 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
4190 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
4191 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
4192 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
4193 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
4194 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
4195 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
4196 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
4197 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
4198 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
4199 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
4200 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
4201 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
4202 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
4203 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
4204 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
4205 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
4206 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
4207 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
4208 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
4209 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
4210 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
4213 Version 1.18.0 (2017-06-08)
4214 ===========================
4219 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
4220 make the item visible to just that module tree. Also accepts the keyword
4221 `crate` to make something public to the whole crate but not users of the
4222 library. Example: `pub(crate) mod utils;`. [RFC 1422].
4223 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
4224 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
4225 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
4226 types like `Write + Send`, trailing `+` are now supported in trait objects,
4227 and better error reporting for trait objects starting with `?Sized`.
4228 - [0e+10 is now a valid floating point literal][40589]
4229 - [Now warns if you bind a lifetime parameter to 'static][40734]
4230 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
4231 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
4232 representation in some cases.][40377]
4237 - [rustc can now emit mir with `--emit mir`][39891]
4238 - [Improved LLVM IR for trivial functions][40367]
4239 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
4240 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
4241 opportunities found through profiling
4242 - [Improved backtrace formatting when panicking][38165]
4247 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
4248 iterator hasn't been advanced the original `Vec` is reassembled with no actual
4249 iteration or reallocation.
4250 - [Simplified HashMap Bucket interface][40561] provides performance
4251 improvements for iterating and cloning.
4252 - [Specialize Vec::from_elem to use calloc][40409]
4253 - [Fixed Race condition in fs::create_dir_all][39799]
4254 - [No longer caching stdio on Windows][40516]
4255 - [Optimized insertion sort in slice][40807] insertion sort in some cases
4256 2.50%~ faster and in one case now 12.50% faster.
4257 - [Optimized `AtomicBool::fetch_nand`][41143]
4262 - [`Child::try_wait`]
4263 - [`HashMap::retain`]
4264 - [`HashSet::retain`]
4266 - [`TcpStream::peek`]
4267 - [`UdpSocket::peek`]
4268 - [`UdpSocket::peek_from`]
4273 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
4274 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
4275 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
4276 - [Added Android build support][cargo/3885]
4277 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
4278 of a certain type, for example `cargo build --bins` will build all
4280 - [Added support for haiku][cargo/3952]
4285 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4286 - [Added rust-windbg script for better debugging on Windows][39983]
4287 - [Rust now uses the official cross compiler for NetBSD][40612]
4288 - [rustdoc now accepts `#` at the start of files][40828]
4289 - [Fixed jemalloc support for musl][41168]
4294 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4295 always placed after the sign if it exists and before the digits. With the `#`
4296 flag the zeroes are placed after the prefix and before the digits.
4297 - [Due to the struct field optimisation][40377], using `transmute` on structs
4298 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4299 always been undefined behavior, but is now more likely to break in practice.
4300 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4301 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4302 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4303 - [Overlapping inherent `impl`s are now a hard error][40728]
4304 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4305 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4306 `out.asm` and `out.ll` instead of only one of the filetypes.
4307 - [ calling a function that returns `Self` will no longer work][41805] when
4308 the size of `Self` cannot be statically determined.
4309 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4310 this has caused a few regressions namely:
4312 - Changed the link order of local static/dynamic libraries (respecting the
4313 order on given rather than having the compiler reorder).
4314 - Changed how MinGW is linked, native code linked to dynamic libraries
4315 may require manually linking to the gcc support library (for the native
4318 [38165]: https://github.com/rust-lang/rust/pull/38165
4319 [39799]: https://github.com/rust-lang/rust/pull/39799
4320 [39891]: https://github.com/rust-lang/rust/pull/39891
4321 [39983]: https://github.com/rust-lang/rust/pull/39983
4322 [40043]: https://github.com/rust-lang/rust/pull/40043
4323 [40241]: https://github.com/rust-lang/rust/pull/40241
4324 [40338]: https://github.com/rust-lang/rust/pull/40338
4325 [40367]: https://github.com/rust-lang/rust/pull/40367
4326 [40377]: https://github.com/rust-lang/rust/pull/40377
4327 [40409]: https://github.com/rust-lang/rust/pull/40409
4328 [40516]: https://github.com/rust-lang/rust/pull/40516
4329 [40556]: https://github.com/rust-lang/rust/pull/40556
4330 [40561]: https://github.com/rust-lang/rust/pull/40561
4331 [40589]: https://github.com/rust-lang/rust/pull/40589
4332 [40612]: https://github.com/rust-lang/rust/pull/40612
4333 [40723]: https://github.com/rust-lang/rust/pull/40723
4334 [40728]: https://github.com/rust-lang/rust/pull/40728
4335 [40731]: https://github.com/rust-lang/rust/pull/40731
4336 [40734]: https://github.com/rust-lang/rust/pull/40734
4337 [40805]: https://github.com/rust-lang/rust/pull/40805
4338 [40807]: https://github.com/rust-lang/rust/pull/40807
4339 [40828]: https://github.com/rust-lang/rust/pull/40828
4340 [40870]: https://github.com/rust-lang/rust/pull/40870
4341 [41085]: https://github.com/rust-lang/rust/pull/41085
4342 [41143]: https://github.com/rust-lang/rust/pull/41143
4343 [41168]: https://github.com/rust-lang/rust/pull/41168
4344 [41270]: https://github.com/rust-lang/rust/issues/41270
4345 [41469]: https://github.com/rust-lang/rust/pull/41469
4346 [41805]: https://github.com/rust-lang/rust/issues/41805
4347 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4348 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4349 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4350 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4351 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4352 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4353 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4354 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4355 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4356 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4357 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4358 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4359 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4360 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4363 Version 1.17.0 (2017-04-27)
4364 ===========================
4369 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4370 * [Fields of structs may be initialized without duplicating the field/variable
4371 names][39761]. [RFC 1682]
4372 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4373 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4374 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4375 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4376 `'b`. Soundness fix.
4377 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4378 * [Static variables may contain references to other statics][40027]
4383 * [Exit quickly on only `--emit dep-info`][40336]
4384 * [Make `-C relocation-model` more correctly determine whether the linker
4385 creates a position-independent executable][40245]
4386 * [Add `-C overflow-checks` to directly control whether integer overflow
4388 * [The rustc type checker now checks items on demand instead of in a single
4389 in-order pass][40008]. This is mostly an internal refactoring in support of
4390 future work, including incremental type checking, but also resolves [RFC
4391 1647], allowing `Self` to appear in `impl` `where` clauses.
4392 * [Optimize vtable loads][39995]
4393 * [Turn off vectorization for Emscripten targets][39990]
4394 * [Provide suggestions for unknown macros imported with `use`][39953]
4395 * [Fix ICEs in path resolution][39939]
4396 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4397 * [Add clearer error message using `&str + &str`][39116]
4408 * [`Ordering::then`]
4409 * [`Ordering::then_with`]
4410 * [`BTreeMap::range`]
4411 * [`BTreeMap::range_mut`]
4412 * [`collections::Bound`]
4413 * [`process::abort`]
4414 * [`ptr::read_unaligned`]
4415 * [`ptr::write_unaligned`]
4416 * [`Result::expect_err`]
4419 * [`Cell::into_inner`]
4425 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4426 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4427 * [`String` implements `FromIterator<&char>`][40028]
4428 * `Box` [implements][40009] a number of new conversions:
4429 `From<Box<str>> for String`,
4430 `From<Box<[T]>> for Vec<T>`,
4431 `From<Box<CStr>> for CString`,
4432 `From<Box<OsStr>> for OsString`,
4433 `From<Box<Path>> for PathBuf`,
4434 `Into<Box<str>> for String`,
4435 `Into<Box<[T]>> for Vec<T>`,
4436 `Into<Box<CStr>> for CString`,
4437 `Into<Box<OsStr>> for OsString`,
4438 `Into<Box<Path>> for PathBuf`,
4439 `Default for Box<str>`,
4440 `Default for Box<CStr>`,
4441 `Default for Box<OsStr>`,
4442 `From<&CStr> for Box<CStr>`,
4443 `From<&OsStr> for Box<OsStr>`,
4444 `From<&Path> for Box<Path>`
4445 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4446 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4447 * [Slightly optimize `slice::sort`][39538]
4448 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4449 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4450 `Box<str>` implements `From<&str>`][39438]
4451 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4452 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4453 * [`format!` estimates the needed capacity before writing a string][39356]
4454 * [Support unprivileged symlink creation in Windows][38921]
4455 * [`PathBuf` implements `Default`][38764]
4456 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4457 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4458 and poor hash functions.
4463 * [Add `cargo check --all`][cargo/3731]
4464 * [Add an option to ignore SSL revocation checking][cargo/3699]
4465 * [Add `cargo run --package`][cargo/3691]
4466 * [Add `required_features`][cargo/3667]
4467 * [Assume `build.rs` is a build script][cargo/3664]
4468 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4473 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4475 * [The "Unstable Book" documents nightly-only features][ubook]
4476 * [Improve the style of the sidebar in rustdoc output][40265]
4477 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4478 * [Fix MSP430 breakage due to `i128`][40257]
4479 * [Preliminary Solaris/SPARCv9 support][39903]
4480 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4481 run without installing the MSVC runtime.
4482 * [`rustdoc --test` includes file names in test names][39788]
4483 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4484 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4485 * [Initial support for `aarch64-unknown-freebsd`][39491]
4486 * [Initial support for `i686-unknown-netbsd`][39426]
4487 * [This release no longer includes the old makefile build system][39431]. Rust
4488 is built with a custom build system, written in Rust, and with Cargo.
4489 * [Add Debug implementations for libcollection structs][39002]
4490 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4491 * [`--test-threads=0` produces an error][38945]
4492 * [`rustup` installs documentation by default][40526]
4493 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4494 WinDbg and Visual Studio to improve the debugging experience.
4499 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4500 workaround, either use MSVC 2015 or run vcvars.bat.
4501 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4502 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4503 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4505 * [`format!` and `Display::to_string` panic if an underlying formatting
4506 implementation returns an error][40117]. Previously the error was silently
4507 ignored. It is incorrect for `write_fmt` to return an error when writing
4509 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4510 crates were marked stable and could be accessed from the stable toolchain.
4511 * [Rust git source no longer includes vendored crates][39728]. Those that need
4512 to build with vendored crates should build from release tarballs.
4513 * [Fix inert attributes from `proc_macro_derives`][39572]
4514 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4515 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4517 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4518 existing code generally ignores the type of dead-code unless a type-hint is
4519 provided; this can cause surprising inference interactions particularly around
4520 defaulting. The new code uniformly ignores the result type of dead-code.
4521 * [Tuple-struct constructors with private fields are no longer visible][38932]
4522 * [Lifetime parameters that do not appear in the arguments are now considered
4523 early-bound][38897], resolving a soundness bug (#[32330]). The
4524 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4526 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4527 * [Make transmuting from fn item types to pointer-sized types a hard
4530 [27787]: https://github.com/rust-lang/rust/issues/27787
4531 [32330]: https://github.com/rust-lang/rust/issues/32330
4532 [34198]: https://github.com/rust-lang/rust/pull/34198
4533 [38161]: https://github.com/rust-lang/rust/pull/38161
4534 [38368]: https://github.com/rust-lang/rust/pull/38368
4535 [38584]: https://github.com/rust-lang/rust/issues/38584
4536 [38661]: https://github.com/rust-lang/rust/pull/38661
4537 [38764]: https://github.com/rust-lang/rust/pull/38764
4538 [38864]: https://github.com/rust-lang/rust/issues/38864
4539 [38897]: https://github.com/rust-lang/rust/pull/38897
4540 [38921]: https://github.com/rust-lang/rust/pull/38921
4541 [38932]: https://github.com/rust-lang/rust/pull/38932
4542 [38945]: https://github.com/rust-lang/rust/pull/38945
4543 [38981]: https://github.com/rust-lang/rust/pull/38981
4544 [39002]: https://github.com/rust-lang/rust/pull/39002
4545 [39116]: https://github.com/rust-lang/rust/pull/39116
4546 [39193]: https://github.com/rust-lang/rust/pull/39193
4547 [39265]: https://github.com/rust-lang/rust/pull/39265
4548 [39356]: https://github.com/rust-lang/rust/pull/39356
4549 [39372]: https://github.com/rust-lang/rust/pull/39372
4550 [39426]: https://github.com/rust-lang/rust/pull/39426
4551 [39431]: https://github.com/rust-lang/rust/pull/39431
4552 [39438]: https://github.com/rust-lang/rust/pull/39438
4553 [39440]: https://github.com/rust-lang/rust/pull/39440
4554 [39485]: https://github.com/rust-lang/rust/pull/39485
4555 [39491]: https://github.com/rust-lang/rust/pull/39491
4556 [39518]: https://github.com/rust-lang/rust/pull/39518
4557 [39538]: https://github.com/rust-lang/rust/pull/39538
4558 [39572]: https://github.com/rust-lang/rust/pull/39572
4559 [39633]: https://github.com/rust-lang/rust/pull/39633
4560 [39642]: https://github.com/rust-lang/rust/pull/39642
4561 [39728]: https://github.com/rust-lang/rust/pull/39728
4562 [39761]: https://github.com/rust-lang/rust/pull/39761
4563 [39788]: https://github.com/rust-lang/rust/pull/39788
4564 [39793]: https://github.com/rust-lang/rust/pull/39793
4565 [39837]: https://github.com/rust-lang/rust/pull/39837
4566 [39843]: https://github.com/rust-lang/rust/pull/39843
4567 [39851]: https://github.com/rust-lang/rust/pull/39851
4568 [39903]: https://github.com/rust-lang/rust/pull/39903
4569 [39939]: https://github.com/rust-lang/rust/pull/39939
4570 [39953]: https://github.com/rust-lang/rust/pull/39953
4571 [39960]: https://github.com/rust-lang/rust/pull/39960
4572 [39990]: https://github.com/rust-lang/rust/pull/39990
4573 [39995]: https://github.com/rust-lang/rust/pull/39995
4574 [40008]: https://github.com/rust-lang/rust/pull/40008
4575 [40009]: https://github.com/rust-lang/rust/pull/40009
4576 [40027]: https://github.com/rust-lang/rust/pull/40027
4577 [40028]: https://github.com/rust-lang/rust/pull/40028
4578 [40037]: https://github.com/rust-lang/rust/pull/40037
4579 [40117]: https://github.com/rust-lang/rust/pull/40117
4580 [40166]: https://github.com/rust-lang/rust/pull/40166
4581 [40245]: https://github.com/rust-lang/rust/pull/40245
4582 [40257]: https://github.com/rust-lang/rust/pull/40257
4583 [40261]: https://github.com/rust-lang/rust/pull/40261
4584 [40265]: https://github.com/rust-lang/rust/pull/40265
4585 [40319]: https://github.com/rust-lang/rust/pull/40319
4586 [40336]: https://github.com/rust-lang/rust/pull/40336
4587 [40526]: https://github.com/rust-lang/rust/pull/40526
4588 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4589 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4590 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4591 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4592 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4593 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4594 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4595 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4596 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4597 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4598 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4599 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4600 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4601 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4602 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4603 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4604 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4605 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4606 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4607 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4608 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4609 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4610 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4611 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4612 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4613 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4614 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4615 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4616 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4617 [mdbook]: https://crates.io/crates/mdbook
4618 [ubook]: https://doc.rust-lang.org/unstable-book/
4621 Version 1.16.0 (2017-03-16)
4622 ===========================
4627 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4628 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4629 match patterns][38069]
4630 * [Clean up semantics of `self` in an import list][38313]
4631 * [`Self` may appear in `impl` headers][38920]
4632 * [`Self` may appear in struct expressions][39282]
4637 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4638 a `.rmeta` file containing only crate metadata][38571]. This can be
4639 used by tools like the Rust Language Service to perform
4640 metadata-only builds.
4641 * [Levenshtein based typo suggestions now work in most places, while
4642 previously they worked only for fields and sometimes for local
4643 variables][38927]. Together with the overhaul of "no
4644 resolution"/"unexpected resolution" errors (#[38154]) they result in
4645 large and systematic improvement in resolution diagnostics.
4646 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4648 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4649 * [`rustc` no longer attempts to provide "consider using an explicit
4650 lifetime" suggestions][37057]. They were inaccurate.
4655 * [`VecDeque::truncate`]
4656 * [`VecDeque::resize`]
4657 * [`String::insert_str`]
4658 * [`Duration::checked_add`]
4659 * [`Duration::checked_sub`]
4660 * [`Duration::checked_div`]
4661 * [`Duration::checked_mul`]
4664 * [`SocketAddr::is_ipv4`]
4665 * [`SocketAddr::is_ipv6`]
4666 * [`IpAddr::is_ipv4`]
4667 * [`IpAddr::is_ipv6`]
4669 * [`Vec::dedup_by_key`]
4670 * [`Result::unwrap_or_default`]
4671 * [`<*const T>::wrapping_offset`]
4672 * [`<*mut T>::wrapping_offset`]
4673 * `CommandExt::creation_flags`
4674 * [`File::set_permissions`]
4675 * [`String::split_off`]
4680 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4681 their argument by `Borrow` parameter][37761]
4682 * [All public types in std implement `Debug`][38006]
4683 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4684 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4685 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4687 * [std: Fix partial writes in `LineWriter`][38062]
4688 * [std: Clamp max read/write sizes on Unix][38062]
4689 * [Use more specific panic message for `&str` slicing errors][38066]
4690 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4691 functionality cannot be achieved in std currently.
4692 * [`writeln!`, like `println!`, now accepts a form with no string
4693 or formatting arguments, to just print a newline][38469]
4694 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4695 * [Reduce the size of static data in `std_unicode::tables`][38781]
4696 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4697 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4699 * [`Duration` implements `Sum`][38712]
4700 * [`String` implements `ToSocketAddrs`][39048]
4705 * [The `cargo check` command does a type check of a project without
4706 building it][cargo/3296]
4707 * [crates.io will display CI badges from Travis and AppVeyor, if
4708 specified in Cargo.toml][cargo/3546]
4709 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4710 * [Compilation profiles accept integer values for `debug`, in addition
4711 to `true` and `false`. These are passed to `rustc` as the value to
4712 `-C debuginfo`][cargo/3534]
4713 * [Implement `cargo --version --verbose`][cargo/3604]
4714 * [All builds now output 'dep-info' build dependencies compatible with
4715 make and ninja][cargo/3557]
4716 * [Build all workspace members with `build --all`][cargo/3511]
4717 * [Document all workspace members with `doc --all`][cargo/3515]
4718 * [Path deps outside workspace are not members][cargo/3443]
4723 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4724 the path to the Rust implementation][38589]
4725 * [The `armv7-linux-androideabi` target no longer enables NEON
4726 extensions, per Google's ABI guide][38413]
4727 * [The stock standard library can be compiled for Redox OS][38401]
4728 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4730 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4732 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4737 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4738 match patterns][38069]
4739 * In this release, references to uninhabited types can not be
4740 pattern-matched. This was accidentally allowed in 1.15.
4741 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4742 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4744 * [Clean up semantics of `self` in an import list][38313]
4745 * Reimplemented lifetime elision. This change was almost entirely compatible
4746 with existing code, but it did close a number of small bugs and loopholes,
4747 as well as being more accepting in some other [cases][41105].
4749 [37057]: https://github.com/rust-lang/rust/pull/37057
4750 [37761]: https://github.com/rust-lang/rust/pull/37761
4751 [38006]: https://github.com/rust-lang/rust/pull/38006
4752 [38051]: https://github.com/rust-lang/rust/pull/38051
4753 [38062]: https://github.com/rust-lang/rust/pull/38062
4754 [38062]: https://github.com/rust-lang/rust/pull/38622
4755 [38066]: https://github.com/rust-lang/rust/pull/38066
4756 [38069]: https://github.com/rust-lang/rust/pull/38069
4757 [38131]: https://github.com/rust-lang/rust/pull/38131
4758 [38154]: https://github.com/rust-lang/rust/pull/38154
4759 [38274]: https://github.com/rust-lang/rust/pull/38274
4760 [38304]: https://github.com/rust-lang/rust/pull/38304
4761 [38313]: https://github.com/rust-lang/rust/pull/38313
4762 [38314]: https://github.com/rust-lang/rust/pull/38314
4763 [38327]: https://github.com/rust-lang/rust/pull/38327
4764 [38401]: https://github.com/rust-lang/rust/pull/38401
4765 [38413]: https://github.com/rust-lang/rust/pull/38413
4766 [38469]: https://github.com/rust-lang/rust/pull/38469
4767 [38559]: https://github.com/rust-lang/rust/pull/38559
4768 [38571]: https://github.com/rust-lang/rust/pull/38571
4769 [38580]: https://github.com/rust-lang/rust/pull/38580
4770 [38589]: https://github.com/rust-lang/rust/pull/38589
4771 [38670]: https://github.com/rust-lang/rust/pull/38670
4772 [38712]: https://github.com/rust-lang/rust/pull/38712
4773 [38726]: https://github.com/rust-lang/rust/pull/38726
4774 [38781]: https://github.com/rust-lang/rust/pull/38781
4775 [38798]: https://github.com/rust-lang/rust/pull/38798
4776 [38909]: https://github.com/rust-lang/rust/pull/38909
4777 [38920]: https://github.com/rust-lang/rust/pull/38920
4778 [38927]: https://github.com/rust-lang/rust/pull/38927
4779 [39048]: https://github.com/rust-lang/rust/pull/39048
4780 [39282]: https://github.com/rust-lang/rust/pull/39282
4781 [39379]: https://github.com/rust-lang/rust/pull/39379
4782 [41105]: https://github.com/rust-lang/rust/issues/41105
4783 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4784 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4785 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4786 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4787 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4788 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4789 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4790 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4791 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4792 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4793 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4794 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4795 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4796 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4797 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4798 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4799 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4800 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4801 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4802 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4803 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4804 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4805 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4806 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4807 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4808 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4809 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4810 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4811 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4812 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4815 Version 1.15.1 (2017-02-09)
4816 ===========================
4818 * [Fix IntoIter::as_mut_slice's signature][39466]
4819 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4821 [39466]: https://github.com/rust-lang/rust/pull/39466
4822 [39523]: https://github.com/rust-lang/rust/pull/39523
4825 Version 1.15.0 (2017-02-02)
4826 ===========================
4831 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4832 stable. This allows popular code-generating crates like Serde and Diesel to
4833 work ergonomically. [RFC 1681].
4834 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4835 with curly braces][36868]. Part of [RFC 1506].
4836 * [A number of minor changes to name resolution have been activated][37127].
4837 They add up to more consistent semantics, allowing for future evolution of
4838 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4839 details of what is different. The breaking changes here have been transitioned
4840 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4841 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4843 * [`?Sized` can be used in `where` clauses][37791]
4844 * [There is now a limit on the size of monomorphized types and it can be
4845 modified with the `#![type_size_limit]` crate attribute, similarly to
4846 the `#![recursion_limit]` attribute][37789]
4851 * [On Windows, the compiler will apply dllimport attributes when linking to
4852 extern functions][37973]. Additional attributes and flags can control which
4853 library kind is linked and its name. [RFC 1717].
4854 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4855 * [The `--test` flag works with procedural macro crates][38107]
4856 * [Fix `extern "aapcs" fn` ABI][37814]
4857 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4858 * [The `format!` expander recognizes incorrect `printf` and shell-style
4859 formatting directives and suggests the correct format][37613].
4860 * [Only report one error for all unused imports in an import list][37456]
4862 Compiler Performance
4863 --------------------
4865 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4866 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4867 * [Don't clone in `UnificationTable::probe`][37848]
4868 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4869 * [Use small vectors in type walker][37760]
4870 * [Macro expansion performance was improved][37701]
4871 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4872 * [Replace FNV with a faster hash function][37229]
4877 * [`std::iter::Iterator::min_by`]
4878 * [`std::iter::Iterator::max_by`]
4879 * [`std::os::*::fs::FileExt`]
4880 * [`std::sync::atomic::Atomic*::get_mut`]
4881 * [`std::sync::atomic::Atomic*::into_inner`]
4882 * [`std::vec::IntoIter::as_slice`]
4883 * [`std::vec::IntoIter::as_mut_slice`]
4884 * [`std::sync::mpsc::Receiver::try_iter`]
4885 * [`std::os::unix::process::CommandExt::before_exec`]
4886 * [`std::rc::Rc::strong_count`]
4887 * [`std::rc::Rc::weak_count`]
4888 * [`std::sync::Arc::strong_count`]
4889 * [`std::sync::Arc::weak_count`]
4890 * [`std::char::encode_utf8`]
4891 * [`std::char::encode_utf16`]
4892 * [`std::cell::Ref::clone`]
4893 * [`std::io::Take::into_inner`]
4898 * [The standard sorting algorithm has been rewritten for dramatic performance
4899 improvements][38192]. It is a hybrid merge sort, drawing influences from
4900 Timsort. Previously it was a naive merge sort.
4901 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4902 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4904 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4905 and `char_indices().last()`][37882]
4906 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4907 * [Chinese characters display correctly in `fmt::Debug`][37855]
4908 * [Derive `Default` for `Duration`][37699]
4909 * [Support creation of anonymous pipes on WinXP/2k][37677]
4910 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4911 * [Don't pass overlapped handles to processes][38835]
4916 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4917 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4918 should instead check the variable at runtime with `std::env`. That the value
4919 was set at build time was a bug, and incorrect when cross-compiling. This
4920 change is known to cause breakage.
4921 * [Add `--all` flag to `cargo test`][cargo/3221]
4922 * [Compile statically against the MSVC CRT][cargo/3363]
4923 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4924 * [Link OpenSSL statically on OSX][cargo/3311]
4925 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4926 * [Test for bad path overrides with summaries][cargo/3336]
4927 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4928 * [Fix retrying crate downloads for network errors][cargo/3348]
4929 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4930 * [Emit more info on --message-format=json][cargo/3319]
4931 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4932 * [Don't ignore errors in workspace manifest][cargo/3409]
4933 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4938 * [Test runners (binaries built with `--test`) now support a `--list` argument
4939 that lists the tests it contains][38185]
4940 * [Test runners now support a `--exact` argument that makes the test filter
4941 match exactly, instead of matching only a substring of the test name][38181]
4942 * [rustdoc supports a `--playground-url` flag][37763]
4943 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4948 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4949 continue to be used in this release by passing `--disable-rustbuild` to the
4950 configure script, but they will be deleted soon. Note that the new build
4951 system uses a different on-disk layout that will likely affect any scripts
4953 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4955 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4956 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4962 * [A number of minor changes to name resolution have been activated][37127].
4963 They add up to more consistent semantics, allowing for future evolution of
4964 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4965 details of what is different. The breaking changes here have been transitioned
4966 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4967 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4968 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4969 should instead check the variable at runtime with `std::env`. That the value
4970 was set at build time was a bug, and incorrect when cross-compiling. This
4971 change is known to cause breakage.
4972 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4973 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4974 1.10 and is now an error by default. It will become a hard error in the near
4976 * [The semantics relating modules to file system directories are changing in
4977 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4978 lint, which is a warning in this release, and will become a hard error in the
4980 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4981 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4982 the underlying iterator][37834]
4984 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4985 [33685]: https://github.com/rust-lang/rust/issues/33685
4986 [36868]: https://github.com/rust-lang/rust/pull/36868
4987 [37127]: https://github.com/rust-lang/rust/pull/37127
4988 [37229]: https://github.com/rust-lang/rust/pull/37229
4989 [37456]: https://github.com/rust-lang/rust/pull/37456
4990 [37527]: https://github.com/rust-lang/rust/pull/37527
4991 [37602]: https://github.com/rust-lang/rust/pull/37602
4992 [37613]: https://github.com/rust-lang/rust/pull/37613
4993 [37615]: https://github.com/rust-lang/rust/pull/37615
4994 [37636]: https://github.com/rust-lang/rust/pull/37636
4995 [37627]: https://github.com/rust-lang/rust/pull/37627
4996 [37642]: https://github.com/rust-lang/rust/pull/37642
4997 [37677]: https://github.com/rust-lang/rust/pull/37677
4998 [37699]: https://github.com/rust-lang/rust/pull/37699
4999 [37701]: https://github.com/rust-lang/rust/pull/37701
5000 [37705]: https://github.com/rust-lang/rust/pull/37705
5001 [37749]: https://github.com/rust-lang/rust/pull/37749
5002 [37760]: https://github.com/rust-lang/rust/pull/37760
5003 [37763]: https://github.com/rust-lang/rust/pull/37763
5004 [37764]: https://github.com/rust-lang/rust/pull/37764
5005 [37789]: https://github.com/rust-lang/rust/pull/37789
5006 [37791]: https://github.com/rust-lang/rust/pull/37791
5007 [37814]: https://github.com/rust-lang/rust/pull/37814
5008 [37817]: https://github.com/rust-lang/rust/pull/37817
5009 [37834]: https://github.com/rust-lang/rust/pull/37834
5010 [37848]: https://github.com/rust-lang/rust/pull/37848
5011 [37855]: https://github.com/rust-lang/rust/pull/37855
5012 [37882]: https://github.com/rust-lang/rust/pull/37882
5013 [37888]: https://github.com/rust-lang/rust/pull/37888
5014 [37973]: https://github.com/rust-lang/rust/pull/37973
5015 [37979]: https://github.com/rust-lang/rust/pull/37979
5016 [38086]: https://github.com/rust-lang/rust/pull/38086
5017 [38107]: https://github.com/rust-lang/rust/pull/38107
5018 [38117]: https://github.com/rust-lang/rust/pull/38117
5019 [38134]: https://github.com/rust-lang/rust/pull/38134
5020 [38146]: https://github.com/rust-lang/rust/pull/38146
5021 [38181]: https://github.com/rust-lang/rust/pull/38181
5022 [38182]: https://github.com/rust-lang/rust/pull/38182
5023 [38185]: https://github.com/rust-lang/rust/pull/38185
5024 [38192]: https://github.com/rust-lang/rust/pull/38192
5025 [38279]: https://github.com/rust-lang/rust/pull/38279
5026 [38835]: https://github.com/rust-lang/rust/pull/38835
5027 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5028 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5029 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
5030 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
5031 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
5032 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
5033 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
5034 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
5035 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
5036 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
5037 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
5038 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
5039 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
5040 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
5041 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
5042 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
5043 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
5044 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
5045 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
5046 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
5047 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
5048 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
5049 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
5050 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
5051 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
5052 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
5053 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
5054 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
5055 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
5056 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
5057 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
5058 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
5059 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
5060 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
5061 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
5062 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
5063 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
5064 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
5067 Version 1.14.0 (2016-12-22)
5068 ===========================
5073 * [`..` matches multiple tuple fields in enum variants, structs
5074 and tuples][36843]. [RFC 1492].
5075 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
5076 * [`use *` and `use ::*` both glob-import from the crate root][37367]
5077 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
5078 dereferencing][36822]
5083 * [Mark enums with non-zero discriminant as non-zero][37224]
5084 * [Lower-case `static mut` names are linted like other
5085 statics and consts][37162]
5086 * [Fix ICE on some macros in const integer positions
5087 (e.g. `[u8; m!()]`)][36819]
5088 * [Improve error message and snippet for "did you mean `x`"][36798]
5089 * [Add a panic-strategy field to the target specification][36794]
5090 * [Include LLVM version in `--version --verbose`][37200]
5092 Compile-time Optimizations
5093 --------------------------
5095 * [Improve macro expansion performance][37569]
5096 * [Shrink `Expr_::ExprInlineAsm`][37445]
5097 * [Replace all uses of SHA-256 with BLAKE2b][37439]
5098 * [Reduce the number of bytes hashed by `IchHasher`][37427]
5099 * [Avoid more allocations when compiling html5ever][37373]
5100 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
5101 * [Avoid some allocations in the macro parser][37318]
5102 * [Use a faster deflate setting][37298]
5103 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
5104 during interning of slices][37270]
5105 * [Optimize `write_metadata`][37267]
5106 * [Don't process obligation forest cycles when stalled][37231]
5107 * [Avoid many `CrateConfig` clones][37161]
5108 * [Optimize `Substs::super_fold_with`][37108]
5109 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
5110 * [Speed up `plug_leaks`][36917]
5115 * [`println!()`, with no arguments, prints newline][36825].
5116 Previously, an empty string was required to achieve the same.
5117 * [`Wrapping` impls standard binary and unary operators, as well as
5118 the `Sum` and `Product` iterators][37356]
5119 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
5121 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
5122 `VecDeque` iterators][37315]
5123 * [Improve `SipHasher` performance on small values][37312]
5124 * [Add Iterator trait TrustedLen to enable better FromIterator /
5126 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
5127 * [`ReadDir` implements `Debug`][37221]
5128 * [Implement `RefUnwindSafe` for atomic types][37178]
5129 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
5130 * [Avoid allocations in `Decoder::read_str`][37064]
5131 * [`io::Error` implements `From<io::ErrorKind>`][37037]
5132 * [Impl `Debug` for raw pointers to unsized data][36880]
5133 * [Don't reuse `HashMap` random seeds][37470]
5134 * [The internal memory layout of `HashMap` is more cache-friendly, for
5135 significant improvements in some operations][36692]
5136 * [`HashMap` uses less memory on 32-bit architectures][36595]
5137 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
5142 * [Expose rustc cfg values to build scripts][cargo/3243]
5143 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
5144 * [Fix passing --features when testing multiple packages][cargo/3280]
5145 * [Use a single profile set per workspace][cargo/3249]
5146 * [Load `replace` sections from lock files][cargo/3220]
5147 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
5152 * [rustup is the recommended Rust installation method][1.14rustup]
5153 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
5154 S390x. These are [tier 2] platforms and may have major defects. Follow the
5155 instructions on the website to install, or add the targets to an existing
5156 installation with `rustup target add`. The new target triples are:
5157 - `mips-unknown-linux-gnu`
5158 - `mipsel-unknown-linux-gnu`
5159 - `mips64-unknown-linux-gnuabi64`
5160 - `mips64el-unknown-linux-gnuabi64 `
5161 - `powerpc-unknown-linux-gnu`
5162 - `powerpc64-unknown-linux-gnu`
5163 - `powerpc64le-unknown-linux-gnu`
5164 - `s390x-unknown-linux-gnu `
5165 * This release includes target (std) builds for ARM Linux running MUSL
5166 libc. These are [tier 2] platforms and may have major defects. Add the
5167 following triples to an existing rustup installation with `rustup target add`:
5168 - `arm-unknown-linux-musleabi`
5169 - `arm-unknown-linux-musleabihf`
5170 - `armv7-unknown-linux-musleabihf`
5171 * This release includes [experimental support for WebAssembly][1.14wasm], via
5172 the `wasm32-unknown-emscripten` target. This target is known to have major
5173 defects. Please test, report, and fix.
5174 * rustup no longer installs documentation by default. Run `rustup
5175 component add rust-docs` to install.
5176 * [Fix line stepping in debugger][37310]
5177 * [Enable line number debuginfo in releases][37280]
5182 * [Disable jemalloc on aarch64/powerpc/mips][37392]
5183 * [Add support for Fuchsia OS][37313]
5184 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
5189 * [A number of forward-compatibility lints used by the compiler
5190 to gradually introduce language changes have been converted
5191 to deny by default][36894]:
5192 - ["use of inaccessible extern crate erroneously allowed"][36886]
5193 - ["type parameter default erroneously allowed in invalid location"][36887]
5194 - ["detects super or self keywords at the beginning of global path"][36888]
5195 - ["two overlapping inherent impls define an item with the same name
5196 were erroneously allowed"][36889]
5197 - ["floating-point constants cannot be used in patterns"][36890]
5198 - ["constants of struct or enum type can only be used in a pattern if
5199 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
5200 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
5201 * [Prohibit patterns in trait methods without bodies][37378]
5202 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
5203 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
5204 * [The `$crate` macro variable is accepted in fewer locations][37213]
5205 * [Impls specifying extra region requirements beyond the trait
5206 they implement are rejected][37167]
5207 * [Enums may not be unsized][37111]. Unsized enums are intended to
5208 work but never have. For now they are forbidden.
5209 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
5211 [tier 2]: https://forge.rust-lang.org/platform-support.html
5212 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
5213 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
5214 [36430]: https://github.com/rust-lang/rust/pull/36430
5215 [36595]: https://github.com/rust-lang/rust/pull/36595
5216 [36595]: https://github.com/rust-lang/rust/pull/36595
5217 [36692]: https://github.com/rust-lang/rust/pull/36692
5218 [36767]: https://github.com/rust-lang/rust/pull/36767
5219 [36794]: https://github.com/rust-lang/rust/pull/36794
5220 [36798]: https://github.com/rust-lang/rust/pull/36798
5221 [36819]: https://github.com/rust-lang/rust/pull/36819
5222 [36822]: https://github.com/rust-lang/rust/pull/36822
5223 [36825]: https://github.com/rust-lang/rust/pull/36825
5224 [36843]: https://github.com/rust-lang/rust/pull/36843
5225 [36880]: https://github.com/rust-lang/rust/pull/36880
5226 [36886]: https://github.com/rust-lang/rust/issues/36886
5227 [36887]: https://github.com/rust-lang/rust/issues/36887
5228 [36888]: https://github.com/rust-lang/rust/issues/36888
5229 [36889]: https://github.com/rust-lang/rust/issues/36889
5230 [36890]: https://github.com/rust-lang/rust/issues/36890
5231 [36891]: https://github.com/rust-lang/rust/issues/36891
5232 [36892]: https://github.com/rust-lang/rust/issues/36892
5233 [36894]: https://github.com/rust-lang/rust/pull/36894
5234 [36917]: https://github.com/rust-lang/rust/pull/36917
5235 [36993]: https://github.com/rust-lang/rust/pull/36993
5236 [37037]: https://github.com/rust-lang/rust/pull/37037
5237 [37064]: https://github.com/rust-lang/rust/pull/37064
5238 [37094]: https://github.com/rust-lang/rust/pull/37094
5239 [37108]: https://github.com/rust-lang/rust/pull/37108
5240 [37111]: https://github.com/rust-lang/rust/pull/37111
5241 [37161]: https://github.com/rust-lang/rust/pull/37161
5242 [37162]: https://github.com/rust-lang/rust/pull/37162
5243 [37167]: https://github.com/rust-lang/rust/pull/37167
5244 [37178]: https://github.com/rust-lang/rust/pull/37178
5245 [37200]: https://github.com/rust-lang/rust/pull/37200
5246 [37213]: https://github.com/rust-lang/rust/pull/37213
5247 [37221]: https://github.com/rust-lang/rust/pull/37221
5248 [37224]: https://github.com/rust-lang/rust/pull/37224
5249 [37230]: https://github.com/rust-lang/rust/pull/37230
5250 [37231]: https://github.com/rust-lang/rust/pull/37231
5251 [37247]: https://github.com/rust-lang/rust/pull/37247
5252 [37267]: https://github.com/rust-lang/rust/pull/37267
5253 [37270]: https://github.com/rust-lang/rust/pull/37270
5254 [37273]: https://github.com/rust-lang/rust/pull/37273
5255 [37280]: https://github.com/rust-lang/rust/pull/37280
5256 [37298]: https://github.com/rust-lang/rust/pull/37298
5257 [37306]: https://github.com/rust-lang/rust/pull/37306
5258 [37310]: https://github.com/rust-lang/rust/pull/37310
5259 [37312]: https://github.com/rust-lang/rust/pull/37312
5260 [37313]: https://github.com/rust-lang/rust/pull/37313
5261 [37315]: https://github.com/rust-lang/rust/pull/37315
5262 [37318]: https://github.com/rust-lang/rust/pull/37318
5263 [37322]: https://github.com/rust-lang/rust/pull/37322
5264 [37326]: https://github.com/rust-lang/rust/pull/37326
5265 [37351]: https://github.com/rust-lang/rust/pull/37351
5266 [37356]: https://github.com/rust-lang/rust/pull/37356
5267 [37367]: https://github.com/rust-lang/rust/pull/37367
5268 [37373]: https://github.com/rust-lang/rust/pull/37373
5269 [37378]: https://github.com/rust-lang/rust/pull/37378
5270 [37389]: https://github.com/rust-lang/rust/pull/37389
5271 [37392]: https://github.com/rust-lang/rust/pull/37392
5272 [37427]: https://github.com/rust-lang/rust/pull/37427
5273 [37439]: https://github.com/rust-lang/rust/pull/37439
5274 [37445]: https://github.com/rust-lang/rust/pull/37445
5275 [37470]: https://github.com/rust-lang/rust/pull/37470
5276 [37569]: https://github.com/rust-lang/rust/pull/37569
5277 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
5278 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
5279 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
5280 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
5281 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
5282 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
5283 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5286 Version 1.13.0 (2016-11-10)
5287 ===========================
5292 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5293 errors, like the `try!` macro, described in [RFC 0243].
5294 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5295 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5296 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5297 * [Fix lifetime rules for 'if' conditions][36029]
5298 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5303 * [Add the `-C link-arg` argument][36574]
5304 * [Remove the old AST-based backend from rustc_trans][35764]
5305 * [Don't enable NEON by default on armv7 Linux][35814]
5306 * [Fix debug line number info for macro expansions][35238]
5307 * [Do not emit "class method" debuginfo for types that are not
5308 DICompositeType][36008]
5309 * [Warn about multiple conflicting #[repr] hints][34623]
5310 * [When sizing DST, don't double-count nested struct prefixes][36351]
5311 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5312 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5313 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5314 * [Expand macros without recursing to avoid stack overflows][36214]
5319 * [Replace macro backtraces with labeled local uses][35702]
5320 * [Improve error message for misplaced doc comments][33922]
5321 * [Buffer unix and lock windows to prevent message interleaving][35975]
5322 * [Update lifetime errors to specifically note temporaries][36171]
5323 * [Special case a few colors for Windows][36178]
5324 * [Suggest `use self` when such an import resolves][36289]
5325 * [Be more specific when type parameter shadows primitive type][36338]
5326 * Many minor improvements
5328 Compile-time Optimizations
5329 --------------------------
5331 * [Compute and cache HIR hashes at beginning][35854]
5332 * [Don't hash types in loan paths][36004]
5333 * [Cache projections in trans][35761]
5334 * [Optimize the parser's last token handling][36527]
5335 * [Only instantiate #[inline] functions in codegen units referencing
5336 them][36524]. This leads to big improvements in cases where crates export
5337 define many inline functions without using them directly.
5338 * [Lazily allocate TypedArena's first chunk][36592]
5339 * [Don't allocate during default HashSet creation][36734]
5346 * [`overflowing_abs`]
5347 * [`RefCell::try_borrow`]
5348 * [`RefCell::try_borrow_mut`]
5353 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5354 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5356 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5357 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5358 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5359 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5360 * [Use arc4rand on FreeBSD][35884]
5361 * [memrchr: Correct aligned offset computation][35969]
5362 * [Improve Demangling of Rust Symbols][36059]
5363 * [Use monotonic time in condition variables][35048]
5364 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5365 * [Implement conversion traits for `char`][35755]
5366 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5367 * [Zero first byte of CString on drop][36264]
5368 * [Inherit overflow checks for sum and product][36372]
5369 * [Add missing Eq implementations][36423]
5370 * [Implement `Debug` for `DirEntry`][36631]
5371 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5373 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5374 * [Implement more traits for `std::io::ErrorKind`][35911]
5375 * [Optimize BinaryHeap bounds checking][36072]
5376 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5377 `extend_with_element`][36355]
5378 * [Fix overflow checking in unsigned pow()][34942]
5383 * This release includes security fixes to both curl and OpenSSL.
5384 * [Fix transitive doctests when panic=abort][cargo/3021]
5385 * [Add --all-features flag to cargo][cargo/3038]
5386 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5387 * [Don't parse the home directory more than once][cargo/3078]
5388 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5389 * [Update OpenSSL to 1.0.2j][cargo/3121]
5390 * [Add license and license_file to cargo metadata output][cargo/3110]
5391 * [Make crates-io registry URL optional in config; ignore all changes to
5392 source.crates-io][cargo/3089]
5393 * [Don't download dependencies from other platforms][cargo/3123]
5394 * [Build transitive dev-dependencies when needed][cargo/3125]
5395 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5396 * [Avoid updating registry when adding existing deps][cargo/3144]
5397 * [Warn about path overrides that won't work][cargo/3136]
5398 * [Use workspaces during `cargo install`][cargo/3146]
5399 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5400 * [Add --message-format flag][cargo/3000]
5401 * [Pass target environment for rustdoc][cargo/3205]
5402 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5403 * [Update curl and curl-sys][cargo/3241]
5404 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5409 * [rustdoc: Add the `--sysroot` argument][36586]
5410 * [rustdoc: Fix a couple of issues with the search results][35655]
5411 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5412 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5413 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5418 * [Remove unmaintained style guide][35124]
5419 * [Add s390x support][36369]
5420 * [Initial work at Haiku OS support][36727]
5421 * [Add mips-uclibc targets][35734]
5422 * [Crate-ify compiler-rt into compiler-builtins][35021]
5423 * [Add rustc version info (git hash + date) to dist tarball][36213]
5424 * Many documentation improvements
5429 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5430 * [Deny (by default) transmuting from fn item types to pointer-sized
5431 types][34923]. Continuing the long transition to zero-sized fn items,
5433 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5435 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5436 * [Fix lifetime rules for 'if' conditions][36029].
5437 * [Inherit overflow checks for sum and product][36372].
5438 * [Forbid user-defined macros named "macro_rules"][36730].
5440 [33922]: https://github.com/rust-lang/rust/pull/33922
5441 [34623]: https://github.com/rust-lang/rust/pull/34623
5442 [34923]: https://github.com/rust-lang/rust/pull/34923
5443 [34942]: https://github.com/rust-lang/rust/pull/34942
5444 [34982]: https://github.com/rust-lang/rust/pull/34982
5445 [35021]: https://github.com/rust-lang/rust/pull/35021
5446 [35048]: https://github.com/rust-lang/rust/pull/35048
5447 [35074]: https://github.com/rust-lang/rust/pull/35074
5448 [35124]: https://github.com/rust-lang/rust/pull/35124
5449 [35234]: https://github.com/rust-lang/rust/pull/35234
5450 [35238]: https://github.com/rust-lang/rust/pull/35238
5451 [35354]: https://github.com/rust-lang/rust/pull/35354
5452 [35559]: https://github.com/rust-lang/rust/pull/35559
5453 [35585]: https://github.com/rust-lang/rust/pull/35585
5454 [35627]: https://github.com/rust-lang/rust/pull/35627
5455 [35655]: https://github.com/rust-lang/rust/pull/35655
5456 [35702]: https://github.com/rust-lang/rust/pull/35702
5457 [35707]: https://github.com/rust-lang/rust/pull/35707
5458 [35728]: https://github.com/rust-lang/rust/pull/35728
5459 [35734]: https://github.com/rust-lang/rust/pull/35734
5460 [35755]: https://github.com/rust-lang/rust/pull/35755
5461 [35761]: https://github.com/rust-lang/rust/pull/35761
5462 [35764]: https://github.com/rust-lang/rust/pull/35764
5463 [35814]: https://github.com/rust-lang/rust/pull/35814
5464 [35854]: https://github.com/rust-lang/rust/pull/35854
5465 [35871]: https://github.com/rust-lang/rust/pull/35871
5466 [35884]: https://github.com/rust-lang/rust/pull/35884
5467 [35911]: https://github.com/rust-lang/rust/pull/35911
5468 [35969]: https://github.com/rust-lang/rust/pull/35969
5469 [35975]: https://github.com/rust-lang/rust/pull/35975
5470 [36004]: https://github.com/rust-lang/rust/pull/36004
5471 [36008]: https://github.com/rust-lang/rust/pull/36008
5472 [36014]: https://github.com/rust-lang/rust/pull/36014
5473 [36029]: https://github.com/rust-lang/rust/pull/36029
5474 [36059]: https://github.com/rust-lang/rust/pull/36059
5475 [36072]: https://github.com/rust-lang/rust/pull/36072
5476 [36101]: https://github.com/rust-lang/rust/pull/36101
5477 [36104]: https://github.com/rust-lang/rust/pull/36104
5478 [36171]: https://github.com/rust-lang/rust/pull/36171
5479 [36173]: https://github.com/rust-lang/rust/pull/36173
5480 [36178]: https://github.com/rust-lang/rust/pull/36178
5481 [36213]: https://github.com/rust-lang/rust/pull/36213
5482 [36214]: https://github.com/rust-lang/rust/pull/36214
5483 [36264]: https://github.com/rust-lang/rust/pull/36264
5484 [36266]: https://github.com/rust-lang/rust/pull/36266
5485 [36289]: https://github.com/rust-lang/rust/pull/36289
5486 [36338]: https://github.com/rust-lang/rust/pull/36338
5487 [36351]: https://github.com/rust-lang/rust/pull/36351
5488 [36355]: https://github.com/rust-lang/rust/pull/36355
5489 [36369]: https://github.com/rust-lang/rust/pull/36369
5490 [36372]: https://github.com/rust-lang/rust/pull/36372
5491 [36423]: https://github.com/rust-lang/rust/pull/36423
5492 [36482]: https://github.com/rust-lang/rust/pull/36482
5493 [36505]: https://github.com/rust-lang/rust/pull/36505
5494 [36524]: https://github.com/rust-lang/rust/pull/36524
5495 [36527]: https://github.com/rust-lang/rust/pull/36527
5496 [36551]: https://github.com/rust-lang/rust/pull/36551
5497 [36574]: https://github.com/rust-lang/rust/pull/36574
5498 [36586]: https://github.com/rust-lang/rust/pull/36586
5499 [36592]: https://github.com/rust-lang/rust/pull/36592
5500 [36631]: https://github.com/rust-lang/rust/pull/36631
5501 [36639]: https://github.com/rust-lang/rust/pull/36639
5502 [36721]: https://github.com/rust-lang/rust/pull/36721
5503 [36727]: https://github.com/rust-lang/rust/pull/36727
5504 [36730]: https://github.com/rust-lang/rust/pull/36730
5505 [36734]: https://github.com/rust-lang/rust/pull/36734
5506 [36754]: https://github.com/rust-lang/rust/pull/36754
5507 [36995]: https://github.com/rust-lang/rust/pull/36995
5508 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5509 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5510 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5511 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5512 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5513 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5514 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5515 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5516 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5517 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5518 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5519 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5520 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5521 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5522 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5523 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5524 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5525 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5526 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5527 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5528 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5529 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5530 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5531 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5532 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5533 [rustup]: https://www.rustup.rs
5534 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5535 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5536 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5537 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5538 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5539 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5540 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5543 Version 1.12.1 (2016-10-20)
5544 ===========================
5549 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5550 * [Confusion with double negation and booleans][36856]
5551 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5552 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5553 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5554 * [Corrupted memory after updated to 1.12][36936]
5555 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5556 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5557 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5559 [36381]: https://github.com/rust-lang/rust/issues/36381
5560 [36856]: https://github.com/rust-lang/rust/issues/36856
5561 [36875]: https://github.com/rust-lang/rust/issues/36875
5562 [36924]: https://github.com/rust-lang/rust/issues/36924
5563 [36926]: https://github.com/rust-lang/rust/issues/36926
5564 [36936]: https://github.com/rust-lang/rust/issues/36936
5565 [37026]: https://github.com/rust-lang/rust/issues/37026
5566 [37112]: https://github.com/rust-lang/rust/issues/37112
5567 [37153]: https://github.com/rust-lang/rust/issues/37153
5570 Version 1.12.0 (2016-09-29)
5571 ===========================
5576 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5577 This translation pass is far simpler than the previous AST->LLVM pass, and
5578 creates opportunities to perform new optimizations directly on the MIR. It
5579 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5580 * [`rustc` presents a new, more readable error format, along with
5581 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5582 Most common editors supporting Rust have been updated to work with it. It was
5583 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5588 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5589 This translation pass is far simpler than the previous AST->LLVM pass, and
5590 creates opportunities to perform new optimizations directly on the MIR. It
5591 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5592 * [Print the Rust target name, not the LLVM target name, with
5593 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5594 * [The computation of `TypeId` is correct in some cases where it was previously
5595 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5596 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5597 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5598 `--print relocation-models`, and `--print code-models` print the available
5599 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5600 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5601 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5602 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5603 These targets produce statically-linked binaries. There are no binary release
5609 * [`rustc` presents a new, more readable error format, along with
5610 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5611 Most common editors supporting Rust have been updated to work with it. It was
5612 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5613 * [In error descriptions, references are now described in plain English,
5614 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5615 * [In error type descriptions, unknown numeric types are named `{integer}` or
5616 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5617 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5622 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5623 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5624 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5625 useful](https://github.com/rust-lang/rust/pull/34908)
5626 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5627 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5628 * [Semicolons are properly required as statement delimiters inside
5629 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5630 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5635 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5636 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5637 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5638 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5639 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5640 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5641 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5642 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5643 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5644 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5645 Both on Unix and Windows.
5646 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5647 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5648 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5649 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5650 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5651 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5652 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5653 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5658 * [The `format!` macro and friends now allow a single argument to be formatted
5659 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5660 * [The lifetime bounds on `[T]::binary_search_by` and
5661 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5662 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5663 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5664 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5665 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5666 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5667 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5668 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5669 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5670 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5671 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5672 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5673 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5674 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5675 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5676 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5677 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5678 * [`mpsc::sync_channel` `Receiver`s return any available message before
5679 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5680 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5681 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5686 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5687 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5688 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5689 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5690 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5691 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5692 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5693 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5694 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5695 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5696 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5697 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5698 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5699 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5700 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5701 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5706 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5707 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5712 * [Test binaries now support a `--test-threads` argument to specify the number
5713 of threads used to run tests, and which acts the same as the
5714 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5715 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5716 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5717 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5718 * [Rust releases now come with source packages that can be installed by rustup
5719 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5720 The resulting source code can be used by tools and IDES, located in the
5721 sysroot under `lib/rustlib/src`.
5726 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5727 * Many minor improvements to the documentation.
5728 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5733 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5734 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5735 * [When formatting strings, if "precision" is specified, the "fill",
5736 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5737 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5740 Version 1.11.0 (2016-08-18)
5741 ===========================
5746 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5747 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5748 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5749 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5754 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5755 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5756 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5757 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5758 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5759 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5760 (in libcore - previously stabilized in libstd)
5761 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5762 (in libcore - previously stabilized in libstd)
5763 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5764 (in libcore - previously stabilized in libstd)
5765 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5766 (in libcore - previously stabilized in libstd)
5767 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5768 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5769 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5770 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5775 * [The `thread_local!` macro supports multiple definitions in a single
5776 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5777 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5778 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5779 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5780 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5781 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5782 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5783 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5788 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5789 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5790 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5791 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5792 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5793 and `-vv` prints warnings for all crates.
5794 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5795 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5796 This provides room for expansion by arbitrary tools.
5797 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5798 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5799 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5800 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5801 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5802 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5803 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5808 * [Caching projections speeds up type check dramatically for some
5809 workloads](https://github.com/rust-lang/rust/pull/33816)
5810 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5811 This hasher is faster, but is believed to provide sufficient
5812 protection from collision attacks.
5813 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5818 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5819 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5820 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5821 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5822 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5827 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5828 * [When emitting debug info, rustc emits frame pointers for closures,
5829 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5830 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5831 * Many more errors have been given error codes and extended
5833 * API documentation continues to be improved, with many new examples
5838 * [rustc no longer hangs when dependencies recursively re-export
5839 submodules](https://github.com/rust-lang/rust/pull/34542)
5840 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5841 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5842 rewritten](https://github.com/rust-lang/rust/pull/33895)
5843 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5844 No targets use this yet, but it works toward AVR support.
5849 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5850 * [The new follow-set rules that place restrictions on `macro_rules!`
5851 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5852 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5853 and has been a warning since 1.10.
5854 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5855 This causes breakage in some corner cases.
5858 Version 1.10.0 (2016-07-07)
5859 ===========================
5864 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5865 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5866 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5867 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5868 * [`panic!` can be converted to a runtime abort with the
5869 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5870 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5871 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5872 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5873 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5874 Note that Cargo does not yet directly support cdylibs.
5879 * `os::windows::fs::OpenOptionsExt::access_mode`
5880 * `os::windows::fs::OpenOptionsExt::share_mode`
5881 * `os::windows::fs::OpenOptionsExt::custom_flags`
5882 * `os::windows::fs::OpenOptionsExt::attributes`
5883 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5884 * `os::unix::fs::OpenOptionsExt::custom_flags`
5885 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5886 * `Default for sync::Weak`
5887 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5888 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5889 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5890 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5891 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5892 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5893 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5894 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5895 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5896 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5897 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5898 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5899 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5900 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5901 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5902 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5903 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5904 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5905 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5906 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5907 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5908 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5909 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5910 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5911 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5912 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5913 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5914 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5915 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5916 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5917 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5918 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5919 * Read/Write/RawFd impls for `UnixStream`
5920 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5921 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5922 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5923 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5924 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5925 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5926 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5927 * RawFd impls for `UnixListener`
5928 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5929 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5930 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5931 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5932 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5933 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5934 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5935 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5936 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5937 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5938 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5939 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5940 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5941 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5942 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5943 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5944 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5945 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5946 * RawFd impls for `UnixDatagram`
5947 * `{BTree,Hash}Map::values_mut`
5948 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5953 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5954 The semantics of this minor method are subtle and probably not what
5956 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5957 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5958 will fall back to `/dev/urandom` temporarily to avoid blocking
5959 during early boot](https://github.com/rust-lang/rust/pull/33086).
5960 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5961 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5962 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5963 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5964 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5965 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5966 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5970 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5971 This controls the runtime behavior of the `panic!` macro
5972 and can be either "unwind" (the default), or "abort".
5973 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5974 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5975 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5976 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5977 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5978 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5979 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5980 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5981 By default they are retried twice, which can be customized with the
5982 `net.retry` value in `.cargo/config`.
5983 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5984 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5985 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5986 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5987 Makes it possible to install multiple crates in parallel.
5988 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5989 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5990 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5991 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5992 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5993 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5998 * [rustc memory usage was reduced by refactoring the context used for
5999 type checking](https://github.com/rust-lang/rust/pull/33425).
6000 * [Speed up creation of `HashMap`s by caching the random keys used
6001 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
6002 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
6003 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
6004 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
6005 10x faster than the previous lookup tables.
6006 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
6011 * Many incremental improvements to documentation and rustdoc.
6012 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
6013 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
6014 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
6015 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
6016 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
6017 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
6018 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
6023 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
6024 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
6025 * [`std` no longer prints backtraces on platforms where the running
6026 module must be loaded with `env::current_exe`, which can't be relied
6027 on](https://github.com/rust-lang/rust/pull/33554).
6028 * This release includes std binaries for the i586-unknown-linux-gnu,
6029 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
6030 i586 target is for old x86 hardware without SSE2, and the armv7
6031 target is for Android running on modern ARM architectures.
6032 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
6033 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
6034 * [On Unix the runtime aborts by calling `libc::abort` instead of
6035 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
6036 * [Rust is now bootstrapped from the previous release of Rust,
6037 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
6042 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
6043 * [`target_env` for Linux ARM targets is just `gnu`, not
6044 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
6045 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
6046 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
6047 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
6048 Affects how macros are parsed.
6049 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
6050 * [Feature-gated attributes on macro-generated macro invocations are
6051 now rejected](https://github.com/rust-lang/rust/pull/32791).
6052 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
6053 This caused some minor changes to type inference.
6056 Version 1.9.0 (2016-05-26)
6057 ==========================
6062 * The `#[deprecated]` attribute when applied to an API will generate
6063 warnings when used. The warnings may be suppressed with
6064 `#[allow(deprecated)]`. [RFC 1270].
6065 * [`fn` item types are zero sized, and each `fn` names a unique
6066 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6067 `transmute` on a `fn` type will generate a warning for a few cycles,
6068 then will be converted to an error.
6069 * [Field and method resolution understand visibility, so private
6070 fields and methods cannot prevent the proper use of public fields
6071 and methods][1.9fv].
6072 * [The parser considers unicode codepoints in the
6073 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
6079 * [`std::panic::catch_unwind`] (renamed from `recover`)
6080 * [`std::panic::resume_unwind`] (renamed from `propagate`)
6081 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
6082 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
6083 * [`str::is_char_boundary`]
6084 * [`<*const T>::as_ref`]
6085 * [`<*mut T>::as_ref`]
6086 * [`<*mut T>::as_mut`]
6087 * [`AsciiExt::make_ascii_uppercase`]
6088 * [`AsciiExt::make_ascii_lowercase`]
6089 * [`char::decode_utf16`]
6090 * [`char::DecodeUtf16`]
6091 * [`char::DecodeUtf16Error`]
6092 * [`char::DecodeUtf16Error::unpaired_surrogate`]
6093 * [`BTreeSet::take`]
6094 * [`BTreeSet::replace`]
6097 * [`HashSet::replace`]
6099 * [`OsString::with_capacity`]
6100 * [`OsString::clear`]
6101 * [`OsString::capacity`]
6102 * [`OsString::reserve`]
6103 * [`OsString::reserve_exact`]
6104 * [`OsStr::is_empty`]
6106 * [`std::os::unix::thread`]
6109 * [`JoinHandleExt::as_pthread_t`]
6110 * [`JoinHandleExt::into_pthread_t`]
6111 * [`HashSet::hasher`]
6112 * [`HashMap::hasher`]
6113 * [`CommandExt::exec`]
6114 * [`File::try_clone`]
6115 * [`SocketAddr::set_ip`]
6116 * [`SocketAddr::set_port`]
6117 * [`SocketAddrV4::set_ip`]
6118 * [`SocketAddrV4::set_port`]
6119 * [`SocketAddrV6::set_ip`]
6120 * [`SocketAddrV6::set_port`]
6121 * [`SocketAddrV6::set_flowinfo`]
6122 * [`SocketAddrV6::set_scope_id`]
6123 * [`slice::copy_from_slice`]
6124 * [`ptr::read_volatile`]
6125 * [`ptr::write_volatile`]
6126 * [`OpenOptions::create_new`]
6127 * [`TcpStream::set_nodelay`]
6128 * [`TcpStream::nodelay`]
6129 * [`TcpStream::set_ttl`]
6130 * [`TcpStream::ttl`]
6131 * [`TcpStream::set_only_v6`]
6132 * [`TcpStream::only_v6`]
6133 * [`TcpStream::take_error`]
6134 * [`TcpStream::set_nonblocking`]
6135 * [`TcpListener::set_ttl`]
6136 * [`TcpListener::ttl`]
6137 * [`TcpListener::set_only_v6`]
6138 * [`TcpListener::only_v6`]
6139 * [`TcpListener::take_error`]
6140 * [`TcpListener::set_nonblocking`]
6141 * [`UdpSocket::set_broadcast`]
6142 * [`UdpSocket::broadcast`]
6143 * [`UdpSocket::set_multicast_loop_v4`]
6144 * [`UdpSocket::multicast_loop_v4`]
6145 * [`UdpSocket::set_multicast_ttl_v4`]
6146 * [`UdpSocket::multicast_ttl_v4`]
6147 * [`UdpSocket::set_multicast_loop_v6`]
6148 * [`UdpSocket::multicast_loop_v6`]
6149 * [`UdpSocket::set_multicast_ttl_v6`]
6150 * [`UdpSocket::multicast_ttl_v6`]
6151 * [`UdpSocket::set_ttl`]
6152 * [`UdpSocket::ttl`]
6153 * [`UdpSocket::set_only_v6`]
6154 * [`UdpSocket::only_v6`]
6155 * [`UdpSocket::join_multicast_v4`]
6156 * [`UdpSocket::join_multicast_v6`]
6157 * [`UdpSocket::leave_multicast_v4`]
6158 * [`UdpSocket::leave_multicast_v6`]
6159 * [`UdpSocket::take_error`]
6160 * [`UdpSocket::connect`]
6161 * [`UdpSocket::send`]
6162 * [`UdpSocket::recv`]
6163 * [`UdpSocket::set_nonblocking`]
6168 * [`std::sync::Once` is poisoned if its initialization function
6170 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
6171 * [Most types implement `fmt::Debug`][1.9db].
6172 * [The default buffer size used by `BufReader` and `BufWriter` was
6173 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
6174 used by other languages.
6175 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
6176 `Duration` additionally implements `*=` and `/=`][1.9ta].
6177 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
6178 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
6179 * [`Chain` implements `BufRead`][1.9ch].
6180 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
6185 * [Cargo can now run concurrently][1.9cc].
6186 * [Top-level overrides allow specific revisions of crates to be
6187 overridden through the entire crate graph][1.9ct]. This is intended
6188 to make upgrades easier for large projects, by allowing crates to be
6189 forked temporarily until they've been upgraded and republished.
6190 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
6191 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
6192 on the commandline][1.9cf]. `rustc` arguments can also be specified
6193 in the `build.rustflags` configuration key.
6198 * [The time complexity of comparing variables for equivalence during type
6199 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
6200 to major compilation time improvement in some scenarios.
6201 * [`ToString` is specialized for `str`, giving it the same performance
6202 as `to_owned`][1.9ts].
6203 * [Spawning processes with `Command::output` no longer creates extra
6205 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
6206 for C-like enums][1.9cl].
6211 * [Passing the `--quiet` flag to a test runner will produce
6212 much-abbreviated output][1.9q].
6213 * The Rust Project now publishes std binaries for the
6214 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
6215 `i586-pc-windows-msvc` targets.
6220 * [`std::sync::Once` is poisoned if its initialization function
6222 * [It is illegal to define methods with the same name in overlapping
6223 inherent `impl` blocks][1.9sn].
6224 * [`fn` item types are zero sized, and each `fn` names a unique
6225 type][1.9fn]. This will break code that transmutes `fn`s, so calling
6226 `transmute` on a `fn` type will generate a warning for a few cycles,
6227 then will be converted to an error.
6228 * [Improvements to const evaluation may trigger new errors when integer
6229 literals are out of range][1.9ce].
6232 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
6233 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
6234 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
6235 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
6236 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
6237 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
6238 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
6239 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
6240 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
6241 [1.9db]: https://github.com/rust-lang/rust/pull/32054
6242 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
6243 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
6244 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
6245 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
6246 [1.9o]: https://github.com/rust-lang/rust/pull/32325
6247 [1.9q]: https://github.com/rust-lang/rust/pull/31887
6248 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
6249 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
6250 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
6251 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
6252 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
6253 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
6254 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
6255 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
6256 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6257 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
6258 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
6259 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
6260 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
6261 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
6262 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
6263 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
6264 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
6265 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
6266 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
6267 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
6268 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
6269 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
6270 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
6271 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
6272 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
6273 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
6274 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
6275 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
6276 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
6277 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
6278 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
6279 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
6280 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
6281 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
6282 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
6283 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6284 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6285 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6286 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6287 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6288 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6289 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6290 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6291 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6292 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6293 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6294 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6295 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6296 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6297 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6298 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6299 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6300 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6301 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6302 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6303 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6304 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6305 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6306 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6307 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6308 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6309 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6310 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6311 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6312 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6313 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6314 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6315 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6316 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6317 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6318 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6319 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6320 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6321 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6322 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6323 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6324 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6325 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6326 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6327 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6328 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6329 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6330 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6331 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6332 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6333 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6334 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6335 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6336 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6337 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6338 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6339 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6340 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6341 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6344 Version 1.8.0 (2016-04-14)
6345 ==========================
6350 * Rust supports overloading of compound assignment statements like
6351 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6352 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6353 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6355 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6356 addition to the non-braced form, `struct Foo;`. [RFC 218].
6362 * [`str::encode_utf16`] (renamed from `utf16_units`)
6363 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6366 * [`ptr::drop_in_place`]
6368 * [`time::SystemTime`]
6370 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6371 * [`Instant::elapsed`]
6372 * [`SystemTime::now`]
6373 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6374 * [`SystemTime::elapsed`]
6375 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6376 * [`SystemTimeError`]
6377 * [`SystemTimeError::duration`]
6378 * Various impls for `SystemTimeError`
6380 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6381 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6382 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6383 * [The `write!` and `writeln!` macros correctly emit errors if any of
6384 their arguments can't be formatted][1.8w].
6385 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6386 * [The Unix-specific `raw` modules, which contain a number of
6387 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6388 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6389 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6390 across platforms was making it difficult to implement `std`
6391 correctly. Those that need these definitions should use the `libc`
6393 * The Unix-specific `MetadataExt` traits, including
6394 `os::unix::fs::MetadataExt`, which expose values such as inode
6395 numbers [no longer return platform-specific types][1.8r], but
6396 instead return widened integers. [RFC 1415].
6397 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6398 * [Atomic loads and stores are not volatile][1.8a].
6399 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6404 * [Inlining hash functions lead to a 3% compile-time improvement in
6405 some workloads][1.8h].
6406 * When using jemalloc, its symbols are [unprefixed so that it
6407 overrides the libc malloc implementation][1.8h]. This means that for
6408 rustc, LLVM is now using jemalloc, which results in a 6%
6409 compile-time improvement on a specific workload.
6410 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6415 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6416 i686-pc-windows-msvc is now considered a tier-1 platform.
6417 * [The `--print targets` flag prints a list of supported targets][1.8t].
6418 * [The `--print cfg` flag prints the `cfg`s defined for the current
6420 * [`rustc` can be built with an new Cargo-based build system, written
6421 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6422 build system. To enable it configure with `configure --rustbuild`.
6423 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6424 variants while also indicating the total number of missing variants
6425 if more than 3][1.8m].
6426 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6427 * The Rust Project now publishes binary releases of the standard
6428 library for a number of tier-2 targets:
6429 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6430 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6431 `x86_64-rumprun-netbsd`. These can be installed with
6432 tools such as [multirust][1.8mr].
6437 * [`cargo init` creates a new Cargo project in the current
6438 directory][1.8ci]. It is otherwise like `cargo new`.
6439 * [Cargo has configuration keys for `-v` and
6440 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6441 `[term]` section of `.cargo/config`.
6442 * [Configuration keys that evaluate to strings or integers can be set
6443 via environment variables][1.8ce]. For example the `build.jobs` key
6444 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6445 precedence over config files.
6446 * [Target-specific dependencies support Rust `cfg` syntax for
6447 describing targets][1.8cfg] so that dependencies for multiple
6448 targets can be specified together. [RFC 1361].
6449 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6450 `RUSTDOC` take precedence over the `build.target-dir`,
6451 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6452 * [The child process tree is killed on Windows when Cargo is
6454 * [The `build.target` configuration value sets the target platform,
6455 like `--target`][1.8ct].
6460 * [Unstable compiler flags have been further restricted][1.8u]. Since
6461 1.0 `-Z` flags have been considered unstable, and other flags that
6462 were considered unstable additionally required passing `-Z
6463 unstable-options` to access. Unlike unstable language and library
6464 features though, these options have been accessible on the stable
6465 release channel. Going forward, *new unstable flags will not be
6466 available on the stable release channel*, and old unstable flags
6467 will warn about their usage. In the future, all unstable flags will
6468 be unavailable on the stable release channel.
6469 * [It is no longer possible to `match` on empty enum variants using
6470 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6471 * The Unix-specific `MetadataExt` traits, including
6472 `os::unix::fs::MetadataExt`, which expose values such as inode
6473 numbers [no longer return platform-specific types][1.8r], but
6474 instead return widened integers. [RFC 1415].
6475 * [Modules sourced from the filesystem cannot appear within arbitrary
6476 blocks, but only within other modules][1.8mf].
6477 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6478 * On Unix, [stack overflow triggers a runtime abort instead of a
6480 * [`Command::spawn` and its equivalents return an error if any of
6481 its command-line arguments contain interior `NUL`s][1.8n].
6482 * [Tuple and unit enum variants from other crates are in the type
6484 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6485 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6486 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6487 instead of `foo.lib`.
6490 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6491 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6492 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6493 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6494 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6495 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6496 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6497 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6498 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6499 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6500 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6501 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6502 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6503 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6504 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6505 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6506 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6507 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6508 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6509 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6510 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6511 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6512 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6513 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6514 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6515 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6516 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6517 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6518 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6519 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6520 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6521 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6522 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6523 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6524 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6525 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6526 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6527 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6528 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6529 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6530 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6531 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6532 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6533 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6534 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6535 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6536 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6537 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6538 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6539 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6540 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6541 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6542 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6543 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6544 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6545 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6546 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6547 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6548 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6549 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6552 Version 1.7.0 (2016-03-03)
6553 ==========================
6560 * [`Path::strip_prefix`] (renamed from relative_from)
6561 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6563 * [`Ipv4Addr::is_loopback`]
6564 * [`Ipv4Addr::is_private`]
6565 * [`Ipv4Addr::is_link_local`]
6566 * [`Ipv4Addr::is_multicast`]
6567 * [`Ipv4Addr::is_broadcast`]
6568 * [`Ipv4Addr::is_documentation`]
6570 * [`Ipv6Addr::is_unspecified`]
6571 * [`Ipv6Addr::is_loopback`]
6572 * [`Ipv6Addr::is_multicast`]
6575 * [`Vec::as_mut_slice`]
6577 * [`String::as_str`]
6578 * [`String::as_mut_str`]
6580 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6582 * `<[T]>::`[`sort_by_key`]
6583 * checked, saturated, and overflowing operations
6584 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6585 * [`i32::saturating_mul`]
6586 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6587 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6588 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6589 * [`u32::saturating_mul`]
6590 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6591 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6592 * and checked, saturated, and overflowing operations for other primitive types
6594 * [`ffi::IntoStringError`]
6595 * [`CString::into_string`]
6596 * [`CString::into_bytes`]
6597 * [`CString::into_bytes_with_nul`]
6598 * `From<CString> for Vec<u8>`
6600 * [`IntoStringError::into_cstring`]
6601 * [`IntoStringError::utf8_error`]
6602 * `Error for IntoStringError`
6604 * [`std::hash::BuildHasher`]
6605 * [`BuildHasher::Hasher`]
6606 * [`BuildHasher::build_hasher`]
6607 * [`std::hash::BuildHasherDefault`]
6608 * [`HashMap::with_hasher`]
6609 * [`HashMap::with_capacity_and_hasher`]
6610 * [`HashSet::with_hasher`]
6611 * [`HashSet::with_capacity_and_hasher`]
6612 * [`std::collections::hash_map::RandomState`]
6613 * [`RandomState::new`]
6614 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6615 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6616 from bytes is faster.
6617 * [The performance of `LineWriter` (and thus `io::stdout`) was
6618 improved by using `memchr` to search for newlines][1.7m].
6619 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6620 `f64` variants were stabilized previously.
6621 * [`BTreeMap` was rewritten to use less memory and improve the performance
6622 of insertion and iteration, the latter by as much as 5x][1.7bm].
6623 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6624 covariant over their contained type][1.7bt].
6625 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6626 over their contained type][1.7ll].
6627 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6629 * [`Any` is implemented for unsized types][1.7a].
6630 * [`Hash` is implemented for `Duration`][1.7h].
6635 * [When running tests with `--test`, rustdoc will pass `--cfg`
6636 arguments to the compiler][1.7dt].
6637 * [The compiler is built with RPATH information by default][1.7rpa].
6638 This means that it will be possible to run `rustc` when installed in
6639 unusual configurations without configuring the dynamic linker search
6641 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6642 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6643 over `LD_LIBRARY_PATH`.
6648 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6649 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6650 * [The `rerun-if-changed` build script directive no longer causes the
6651 build script to incorrectly run twice in certain scenarios][1.7rr].
6656 * Soundness fixes to the interactions between associated types and
6657 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6658 code that violates the new rules. This is a significant change that
6659 is known to break existing code, so it has emitted warnings for the
6660 new error cases since 1.4 to give crate authors time to adapt. The
6661 details of what is changing are subtle; read the RFC for more.
6662 * [Several bugs in the compiler's visibility calculations were
6663 fixed][1.7v]. Since this was found to break significant amounts of
6664 code, the new errors will be emitted as warnings for several release
6665 cycles, under the `private_in_public` lint.
6666 * Defaulted type parameters were accidentally accepted in positions
6667 that were not intended. In this release, [defaulted type parameters
6668 appearing outside of type definitions will generate a
6669 warning][1.7d], which will become an error in future releases.
6670 * [Parsing "." as a float results in an error instead of 0][1.7p].
6671 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6672 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6674 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6675 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6676 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6677 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6678 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6679 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6680 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6681 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6682 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6683 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6684 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6685 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6686 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6687 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6688 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6689 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6690 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6691 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6692 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6693 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6694 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6695 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6696 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6697 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6698 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6699 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6700 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6701 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6702 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6703 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6704 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6705 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6706 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6707 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6708 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6709 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6710 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6711 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6712 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6713 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6714 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6715 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6716 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6717 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6718 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6719 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6720 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6721 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6722 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6723 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6724 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6725 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6726 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6727 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6728 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6729 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6730 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6731 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6732 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6733 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6734 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6735 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6736 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6737 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6738 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6739 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6740 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6741 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6742 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6743 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6744 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6745 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6746 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6747 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6748 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6749 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6750 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6751 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6752 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6755 Version 1.6.0 (2016-01-21)
6756 ==========================
6761 * The `#![no_std]` attribute causes a crate to not be linked to the
6762 standard library, but only the [core library][1.6co], as described
6763 in [RFC 1184]. The core library defines common types and traits but
6764 has no platform dependencies whatsoever, and is the basis for Rust
6765 software in environments that cannot support a full port of the
6766 standard library, such as operating systems. Most of the core
6767 library is now stable.
6773 [`Read::read_exact`],
6774 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6775 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6776 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6777 [`os::unix::fs::DirBuilderExt`],
6778 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6779 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6780 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6781 [`collections::hash_map::Drain`],
6782 [`collections::hash_map::HashMap::drain`],
6783 [`collections::hash_set::Drain`],
6784 [`collections::hash_set::HashSet::drain`],
6785 [`collections::binary_heap::Drain`],
6786 [`collections::binary_heap::BinaryHeap::drain`],
6787 [`Vec::extend_from_slice`] (renamed from `push_all`),
6788 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6789 [`RwLock::into_inner`],
6790 [`Iterator::min_by_key`] (renamed from `min_by`),
6791 [`Iterator::max_by_key`] (renamed from `max_by`).
6792 * The [core library][1.6co] is stable, as are most of its APIs.
6793 * [The `assert_eq!` macro supports arguments that don't implement
6794 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6796 * Several timer functions that take duration in milliseconds [are
6797 deprecated in favor of those that take `Duration`][1.6ms]. These
6798 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6799 `thread::park_timeout_ms`.
6800 * The algorithm by which `Vec` reserves additional elements was
6801 [tweaked to not allocate excessive space][1.6a] while still growing
6803 * `From` conversions are [implemented from integers to floats][1.6f]
6804 in cases where the conversion is lossless. Thus they are not
6805 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6806 or `f64`. They are also not implemented for `isize` and `usize`
6807 because the implementations would be platform-specific. `From` is
6808 also implemented from `f32` to `f64`.
6809 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6810 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6811 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6812 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6814 * Sorting slices that are already sorted [is 50% faster in some
6820 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6821 * Cargo build scripts can specify their dependencies by emitting the
6822 [`rerun-if-changed`][1.6rr] key.
6823 * crates.io will reject publication of crates with dependencies that
6824 have a wildcard version constraint. Crates with wildcard
6825 dependencies were seen to cause a variety of problems, as described
6826 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6828 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6829 release folder. A variety of artifacts that Cargo failed to clean
6830 are now correctly deleted.
6835 * The `unreachable_code` lint [warns when a function call's argument
6837 * The parser indicates [failures that may be caused by
6838 confusingly-similar Unicode characters][1.6uc]
6839 * Certain macro errors [are reported at definition time][1.6m], not
6845 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6846 environment variable when locating crates. This was a pre-cargo
6847 feature for integrating with the package manager that was
6848 accidentally never removed.
6849 * [A number of bugs were fixed in the privacy checker][1.6p] that
6850 could cause previously-accepted code to break.
6851 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6852 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6853 struct pattern syntax (`Foo(..)`) can no longer be used to match
6854 unit structs. This is a warning now, but will become an error in
6855 future releases. Patterns that share the same name as a const are
6857 * A bug was fixed that causes [rustc not to apply default type
6858 parameters][1.6xc] when resolving certain method implementations of
6859 traits defined in other crates.
6861 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6862 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6863 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6864 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6865 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6866 [1.6co]: http://doc.rust-lang.org/core/index.html
6867 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6868 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6869 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6870 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6871 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6872 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6873 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6874 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6875 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6876 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6877 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6878 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6879 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6880 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6881 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6882 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6883 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6884 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6885 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6886 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6887 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6888 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6889 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6890 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6891 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6892 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6893 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6894 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6895 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6896 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6897 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6898 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6899 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6900 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6901 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6902 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6903 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6904 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6905 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6906 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6907 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6910 Version 1.5.0 (2015-12-10)
6911 ==========================
6913 * ~700 changes, numerous bugfixes
6919 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6920 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6921 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6922 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6923 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6924 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6925 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6926 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6927 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6928 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6929 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6930 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6931 [`Path::read_link`], [`Path::symlink_metadata`],
6932 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6933 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6934 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6935 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6936 [`slice::split_first_mut`], [`slice::split_first`],
6937 [`slice::split_last_mut`], [`slice::split_last`],
6938 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6939 [`str::MatchIndices`], [`str::RMatchIndices`],
6940 [`str::match_indices`], [`str::rmatch_indices`],
6941 [`str::slice_mut_unchecked`], [`string::ParseError`].
6942 * Rust applications hosted on crates.io can be installed locally to
6943 `~/.cargo/bin` with the [`cargo install`] command. Among other
6944 things this makes it easier to augment Cargo with new subcommands:
6945 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6946 invoked as `cargo foo`.
6947 * Crates with wildcard (`*`) dependencies will [emit warnings when
6948 published][1.5w]. In 1.6 it will no longer be possible to publish
6949 crates with wildcard dependencies.
6954 * The rules determining when a particular lifetime must outlive
6955 a particular value (known as '[dropck]') have been [modified
6956 to not rely on parametricity][1.5p].
6957 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6958 and `Arc`][1.5a]. Because these smart pointer types implement
6959 `Deref`, this causes breakage in cases where the interior type
6960 contains methods of the same name.
6961 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6962 that they could drop their content. Soundness fix.
6963 * All method invocations are [properly checked][1.5wf1] for
6964 [well-formedness][1.5wf2]. Soundness fix.
6965 * Traits whose supertraits contain `Self` are [not object
6966 safe][1.5o]. Soundness fix.
6967 * Target specifications support a [`no_default_libraries`][1.5nd]
6968 setting that controls whether `-nodefaultlibs` is passed to the
6969 linker, and in turn the `is_like_windows` setting no longer affects
6970 the `-nodefaultlibs` flag.
6971 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6972 * The `#[inline]` and `#[repr]` attributes [can only appear
6973 in valid locations][1.5at].
6974 * Native libraries linked from the local crate are [passed to
6975 the linker before native libraries from upstream crates][1.5nl].
6976 * Two rarely-used attributes, `#[no_debug]` and
6977 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6978 * Negation of unsigned integers, which has been a warning for
6979 several releases, [is now behind a feature gate and will
6980 generate errors][1.5nu].
6981 * The parser accidentally accepted visibility modifiers on
6982 enum variants, a bug [which has been fixed][1.5ev].
6983 * [A bug was fixed that allowed `use` statements to import unstable
6989 * When evaluating expressions at compile-time that are not
6990 compile-time constants (const-evaluating expressions in non-const
6991 contexts), incorrect code such as overlong bitshifts and arithmetic
6992 overflow will [generate a warning instead of an error][1.5ce],
6993 delaying the error until runtime. This will allow the
6994 const-evaluator to be expanded in the future backwards-compatibly.
6995 * The `improper_ctypes` lint [no longer warns about using `isize` and
6996 `usize` in FFI][1.5ict].
7001 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
7003 * `Default` is [implemented for mutable slices][1.5d].
7004 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
7005 * There are now `From` conversions [between floating point
7006 types][1.5f] where the conversions are lossless.
7007 * There are now `From` conversions [between integer types][1.5i] where
7008 the conversions are lossless.
7009 * [`fs::Metadata` implements `Clone`][1.5fs].
7010 * The `parse` method [accepts a leading "+" when parsing
7012 * [`AsMut` is implemented for `Vec`][1.5am].
7013 * The `clone_from` implementations for `String` and `BinaryHeap` [have
7014 been optimized][1.5cf] and no longer rely on the default impl.
7015 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
7016 `unsafe extern "C"` function types now [implement `Clone`,
7017 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
7018 `fmt::Debug` for up to 12 arguments][1.5fp].
7019 * [Dropping `Vec`s is much faster in unoptimized builds when the
7020 element types don't implement `Drop`][1.5dv].
7021 * A bug that caused in incorrect behavior when [combining `VecDeque`
7022 with zero-sized types][1.5vdz] was resolved.
7023 * [`PartialOrd` for slices is faster][1.5po].
7028 * [Crate metadata size was reduced by 20%][1.5md].
7029 * [Improvements to code generation reduced the size of libcore by 3.3
7030 MB and rustc's memory usage by 18MB][1.5m].
7031 * [Improvements to deref translation increased performance in
7032 unoptimized builds][1.5dr].
7033 * Various errors in trait resolution [are deduplicated to only be
7034 reported once][1.5te].
7035 * Rust has preliminary [support for rumprun kernels][1.5rr].
7036 * Rust has preliminary [support for NetBSD on amd64][1.5na].
7038 [1.5use]: https://github.com/rust-lang/rust/pull/28364
7039 [1.5po]: https://github.com/rust-lang/rust/pull/28436
7040 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
7041 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
7042 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
7043 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
7044 [1.5md]: https://github.com/rust-lang/rust/pull/28521
7045 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
7046 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
7047 [1.5na]: https://github.com/rust-lang/rust/pull/28543
7048 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
7049 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
7050 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
7051 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
7052 [1.5te]: https://github.com/rust-lang/rust/pull/28645
7053 [1.5at]: https://github.com/rust-lang/rust/pull/28650
7054 [1.5am]: https://github.com/rust-lang/rust/pull/28663
7055 [1.5m]: https://github.com/rust-lang/rust/pull/28778
7056 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
7057 [1.5a]: https://github.com/rust-lang/rust/pull/28811
7058 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
7059 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
7060 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
7061 [1.5i]: https://github.com/rust-lang/rust/pull/28921
7062 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
7063 [1.5f]: https://github.com/rust-lang/rust/pull/29129
7064 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
7065 [1.5s]: https://github.com/rust-lang/rust/pull/29190
7066 [1.5d]: https://github.com/rust-lang/rust/pull/29245
7067 [1.5o]: https://github.com/rust-lang/rust/pull/29259
7068 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
7069 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7070 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
7071 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
7072 [1.5c]: https://github.com/rust-lang/rust/pull/29110
7073 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
7074 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
7075 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
7076 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
7077 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
7078 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
7079 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
7080 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
7081 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
7082 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
7083 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
7084 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
7085 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
7086 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
7087 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
7088 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
7089 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
7090 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
7091 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
7092 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
7093 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
7094 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
7095 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
7096 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
7097 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
7098 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
7099 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
7100 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
7101 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
7102 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
7103 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
7104 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
7105 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
7106 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
7107 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
7108 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
7109 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
7110 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
7111 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
7112 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
7113 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
7114 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
7115 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
7116 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
7117 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
7118 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
7119 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
7120 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
7121 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
7122 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
7123 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
7124 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
7125 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
7126 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
7128 Version 1.4.0 (2015-10-29)
7129 ==========================
7131 * ~1200 changes, numerous bugfixes
7136 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
7137 GNU) are now supported and recommended for use.
7142 * [Several changes have been made to fix type soundness and improve
7143 the behavior of associated types][sound]. See [RFC 1214]. Although
7144 we have mostly introduced these changes as warnings this release, to
7145 become errors next release, there are still some scenarios that will
7146 see immediate breakage.
7147 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
7148 line breaks in addition to `\n`][crlf].
7149 * [Loans of `'static` lifetime extend to the end of a function][stat].
7150 * [`str::parse` no longer introduces avoidable rounding error when
7151 parsing floating point numbers. Together with earlier changes to
7152 float formatting/output, "round trips" like f.to_string().parse()
7153 now preserve the value of f exactly. Additionally, leading plus
7154 signs are now accepted][fp3].
7160 * `use` statements that import multiple items [can now rename
7161 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
7162 * [Binops work correctly on fat pointers][binfat].
7163 * `pub extern crate`, which does not behave as expected, [issues a
7164 warning][pec] until a better solution is found.
7169 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
7170 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
7171 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
7172 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
7173 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
7174 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
7175 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
7176 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
7177 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
7178 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
7179 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
7180 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
7181 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
7182 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
7183 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
7184 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
7185 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
7186 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
7188 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
7189 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
7190 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
7191 `f64::from_str_radix`.
7192 * [Reverse-searching strings is faster with the 'two-way'
7194 * [`std::io::copy` allows `?Sized` arguments][cc].
7195 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
7196 [override `count`, `nth` and `last` with an O(1)
7197 implementation][it].
7198 * [`Default` is implemented for arrays up to `[T; 32]`][d].
7199 * [`IntoRawFd` has been added to the Unix-specific prelude,
7200 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
7202 * [`Extend<String>` and `FromIterator<String` are both implemented for
7204 * [`IntoIterator` is implemented for references to `Option` and
7206 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
7207 Copy`][ext] as part of [RFC 839]. This will cause type inference
7208 breakage in rare situations.
7209 * [`BinaryHeap` implements `Debug`][bh2].
7210 * [`Borrow` and `BorrowMut` are implemented for fixed-size
7212 * [`extern fn`s with the "Rust" and "C" ABIs implement common
7213 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
7214 * [String comparison is faster][faststr].
7215 * `&mut T` where `T: std::fmt::Write` [also implements
7216 `std::fmt::Write`][mutw].
7217 * [A stable regression in `VecDeque::push_back` and other
7218 capacity-altering methods that caused panics for zero-sized types
7220 * [Function pointers implement traits for up to 12 parameters][fp2].
7225 * The compiler [no longer uses the 'morestack' feature to prevent
7226 stack overflow][mm]. Instead it uses guard pages and stack
7227 probes (though stack probes are not yet implemented on any platform
7229 * [The compiler matches traits faster when projections are involved][p].
7230 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
7232 * [Cargo now displays useful information about what its doing during
7233 `cargo update`][cu].
7235 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
7236 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
7237 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
7238 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
7239 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
7240 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
7241 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
7242 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
7243 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
7244 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
7245 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
7246 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
7247 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
7248 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
7249 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
7250 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
7251 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
7252 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
7253 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7254 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7255 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7256 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7257 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
7258 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
7259 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
7260 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
7261 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
7262 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
7263 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
7264 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
7265 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
7266 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
7267 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
7268 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
7269 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
7270 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
7271 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
7272 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
7273 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
7274 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
7275 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
7276 [bh2]: https://github.com/rust-lang/rust/pull/28156
7277 [binfat]: https://github.com/rust-lang/rust/pull/28270
7278 [bm]: https://github.com/rust-lang/rust/pull/28197
7279 [cc]: https://github.com/rust-lang/rust/pull/27531
7280 [crlf]: https://github.com/rust-lang/rust/pull/28034
7281 [cu]: https://github.com/rust-lang/cargo/pull/1931
7282 [d]: https://github.com/rust-lang/rust/pull/27825
7283 [dep]: https://github.com/rust-lang/rust/pull/28339
7284 [es]: https://github.com/rust-lang/rust/pull/27956
7285 [ext]: https://github.com/rust-lang/rust/pull/28094
7286 [faststr]: https://github.com/rust-lang/rust/pull/28338
7287 [ffi]: https://github.com/rust-lang/rust/pull/28779
7288 [fp]: https://github.com/rust-lang/rust/pull/28268
7289 [fp2]: https://github.com/rust-lang/rust/pull/28560
7290 [fp3]: https://github.com/rust-lang/rust/pull/27307
7291 [i]: https://github.com/rust-lang/rust/pull/27451
7292 [into2]: https://github.com/rust-lang/rust/pull/28039
7293 [it]: https://github.com/rust-lang/rust/pull/27652
7294 [mm]: https://github.com/rust-lang/rust/pull/27338
7295 [mutw]: https://github.com/rust-lang/rust/pull/28368
7296 [sound]: https://github.com/rust-lang/rust/pull/27641
7297 [p]: https://github.com/rust-lang/rust/pull/27866
7298 [pec]: https://github.com/rust-lang/rust/pull/28486
7299 [pr]: https://github.com/rust-lang/rust/pull/27896
7300 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7301 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7302 [s]: https://github.com/rust-lang/rust/pull/27474
7303 [stab]: https://github.com/rust-lang/rust/pull/28339
7304 [stat]: https://github.com/rust-lang/rust/pull/28321
7305 [vd]: https://github.com/rust-lang/rust/pull/28494
7307 Version 1.3.0 (2015-09-17)
7308 ==============================
7310 * ~900 changes, numerous bugfixes
7315 * The [new object lifetime defaults][nold] have been [turned
7316 on][nold2] after a cycle of warnings about the change. Now types
7317 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7318 being interpreted as `&'a Box<Trait+'a>` to `&'a
7319 Box<Trait+'static>`.
7320 * [The Rustonomicon][nom] is a new book in the official documentation
7321 that dives into writing unsafe Rust.
7322 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7323 timekeeping is employed by other std APIs, as well as out-of-tree
7329 * The [new object lifetime defaults][nold] have been [turned
7330 on][nold2] after a cycle of warnings about the change.
7331 * There is a known [regression][lr] in how object lifetime elision is
7332 interpreted, the proper solution for which is undetermined.
7333 * The `#[prelude_import]` attribute, an internal implementation
7334 detail, was accidentally stabilized previously. [It has been put
7335 behind the `prelude_import` feature gate][pi]. This change is
7336 believed to break no existing code.
7337 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7338 [more sane for dynamically sized types][dst3]. Code that relied on
7339 the previous behavior is thought to be broken.
7340 * The `dropck` rules, which checks that destructors can't access
7341 destroyed values, [have been updated][dropck] to match the
7342 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7343 cause some previously-compiling code to no longer build.
7348 * The [new object lifetime defaults][nold] have been [turned
7349 on][nold2] after a cycle of warnings about the change.
7350 * Semicolons may [now follow types and paths in
7351 macros](https://github.com/rust-lang/rust/pull/27000).
7352 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7353 [more sane for dynamically sized types][dst3]. Code that relied on
7354 the previous behavior is not known to exist, and suspected to be
7356 * `'static` variables [may now be recursive][st].
7357 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7358 implementations correctly.
7359 * The `dropck` rules, which checks that destructors can't access
7360 destroyed values, [have been updated][dropck] to match the
7366 * The [`Duration`] API, [has been stabilized][ds], as well as the
7367 `std::time` module, which presently contains only `Duration`.
7368 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7369 * The owned C string, [`CString`], implements [`Borrow`] and the
7370 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7371 these allow C strings to be borrowed and cloned in generic code.
7372 * [`CStr`] implements [`Debug`].
7373 * [`AtomicPtr`] implements [`Debug`].
7374 * [`Error`] trait objects [can be downcast to their concrete types][e]
7375 in many common configurations, using the [`is`], [`downcast`],
7376 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7378 * Searching for substrings now [employs the two-way algorithm][search]
7379 instead of doing a naive search. This gives major speedups to a
7380 number of methods, including [`contains`][sc], [`find`][sf],
7381 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7382 [`ends_with`][sew] are also faster.
7383 * The performance of `PartialEq` for slices is [much faster][ps].
7384 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7385 is overridden and optimized by the implementations for scalars.
7386 * The [`Hasher`] trait now has a number of specialized `write_*`
7387 methods for primitive types, for efficiency.
7388 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7389 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7390 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7391 of [`std::error::Error::cause`][iec] also delegates to the inner
7393 * [`process::Child`][pc] gained the [`id`] method, which returns a
7394 `u32` representing the platform-specific process identifier.
7395 * The [`connect`] method on slices is deprecated, replaced by the new
7396 [`join`] method (note that both of these are on the *unstable*
7397 [`SliceConcatExt`] trait, but through the magic of the prelude are
7398 available to stable code anyway).
7399 * The [`Div`] operator is implemented for [`Wrapping`] types.
7400 * [`DerefMut` is implemented for `String`][dms].
7401 * Performance of SipHash (the default hasher for `HashMap`) is
7402 [better for long data][sh].
7403 * [`AtomicPtr`] implements [`Send`].
7404 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7405 are now [specialized to use uninitialized buffers for increased
7407 * Lifetime parameters of foreign functions [are now resolved
7413 * Rust can now, with some coercion, [produce programs that run on
7414 Windows XP][xp], though XP is not considered a supported platform.
7415 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7416 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7417 recommended for use in 1.3, though should be fully-functional
7418 in the [64-bit 1.4 beta][b14].
7419 * On Fedora-based systems installation will [properly configure the
7420 dynamic linker][fl].
7421 * The compiler gained many new extended error descriptions, which can
7422 be accessed with the `--explain` flag.
7423 * The `dropck` pass, which checks that destructors can't access
7424 destroyed values, [has been rewritten][dropck]. This fixes some
7425 soundness holes, and as such will cause some previously-compiling
7426 code to no longer build.
7427 * `rustc` now uses [LLVM to write archive files where possible][ar].
7428 Eventually this will eliminate the compiler's dependency on the ar
7430 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7431 supported FreeBSD on x86_64).
7432 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7433 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7435 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7436 will kill the process instead of leaking][nlp].
7438 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7439 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7440 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7441 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7442 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7443 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7444 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7445 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7446 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7447 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7448 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7449 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7450 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7451 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7452 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7453 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7454 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7455 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7456 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7457 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7458 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7459 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7460 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7461 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7462 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7463 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7464 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7465 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7466 [ar]: https://github.com/rust-lang/rust/pull/26926
7467 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7468 [dms]: https://github.com/rust-lang/rust/pull/26241
7469 [dropck]: https://github.com/rust-lang/rust/pull/27261
7470 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7471 [ds]: https://github.com/rust-lang/rust/pull/26818
7472 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7473 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7474 [dst3]: https://github.com/rust-lang/rust/pull/27351
7475 [e]: https://github.com/rust-lang/rust/pull/24793
7476 [f]: https://github.com/rust-lang/rust/pull/26588
7477 [fb]: https://github.com/rust-lang/rust/pull/26959
7478 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7479 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7480 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7481 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7482 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7483 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7484 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7485 [lic]: https://github.com/rust-lang/rust/pull/26583
7486 [lnu]: https://github.com/rust-lang/rust/pull/27026
7487 [lr]: https://github.com/rust-lang/rust/issues/27248
7488 [lum]: https://github.com/rust-lang/rust/pull/26378
7489 [lur]: https://github.com/rust-lang/rust/pull/26783
7490 [nlp]: https://github.com/rust-lang/rust/pull/27176
7491 [nold2]: https://github.com/rust-lang/rust/pull/27045
7492 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7493 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7494 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7495 [pi]: https://github.com/rust-lang/rust/pull/26699
7496 [ps]: https://github.com/rust-lang/rust/pull/26884
7497 [rte]: https://github.com/rust-lang/rust/pull/26950
7498 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7499 [search]: https://github.com/rust-lang/rust/pull/26327
7500 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7501 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7502 [sh]: https://github.com/rust-lang/rust/pull/27280
7503 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7504 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7505 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7506 [st]: https://github.com/rust-lang/rust/pull/26630
7507 [win1]: https://github.com/rust-lang/rust/pull/26569
7508 [win2]: https://github.com/rust-lang/rust/pull/26741
7509 [win3]: https://github.com/rust-lang/rust/pull/26741
7510 [win4]: https://github.com/rust-lang/rust/pull/27210
7511 [xp]: https://github.com/rust-lang/rust/pull/26569
7513 Version 1.2.0 (2015-08-07)
7514 ==========================
7516 * ~1200 changes, numerous bugfixes
7521 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7522 like `Rc` to contain types without a fixed size, arrays and trait
7523 objects, finally enabling use of `Rc<[T]>` and completing the
7524 implementation of DST.
7525 * [Parallel codegen][parcodegen] is now working again, which can
7526 substantially speed up large builds in debug mode; It also gets
7527 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7528 jobs). It's not enabled by default, but will be "in the near
7529 future". It can be activated with the `-C codegen-units=N` flag to
7531 * This is the first release with [experimental support for linking
7532 with the MSVC linker and lib C on Windows (instead of using the GNU
7533 variants via MinGW)][win]. It is yet recommended only for the most
7534 intrepid Rustaceans.
7535 * Benchmark compilations are showing a 30% improvement in
7536 bootstrapping over 1.1.
7541 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7542 unicode case mapping, which is a previously-planned change in
7543 behavior and considered a bugfix.
7544 * [`mem::align_of`] now specifies [the *minimum alignment* for
7545 T][align], which is usually the alignment programs are interested
7546 in, and the same value reported by clang's
7547 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7549 * [The `#[packed]` attribute is no longer silently accepted by the
7550 compiler][packed]. This attribute did nothing and code that
7551 mentioned it likely did not work as intended.
7552 * Associated type defaults are [now behind the
7553 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7554 defaults *did not work*, but could be mentioned syntactically. As
7555 such this breakage has minimal impact.
7560 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7561 matching against dereferenceable values.
7566 * The [`Extend`] trait, which grows a collection from an iterator, is
7567 implemented over iterators of references, for `String`, `Vec`,
7568 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7569 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7570 * The [`iter::once`] function returns an iterator that yields a single
7571 element, and [`iter::empty`] returns an iterator that yields no
7573 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7574 over substring matches.
7575 * [`Cell`] and [`RefCell`] both implement `Eq`.
7576 * A number of methods for wrapping arithmetic are added to the
7577 integral types, [`wrapping_div`], [`wrapping_rem`],
7578 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7579 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7580 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7581 type.. It is illegal for the default arithmetic operations in Rust
7582 to overflow; the desire to wrap must be explicit.
7583 * The `{:#?}` formatting specifier [displays the alternate,
7584 pretty-printed][debugfmt] form of the `Debug` formatter. This
7585 feature was actually introduced prior to 1.0 with little
7587 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7588 for writing data to formatted strings, similar to [`io::Write`].
7589 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7590 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7591 are used by code generators to emit implementations of [`Debug`].
7592 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7593 methods that convert case, following Unicode case mapping.
7594 * It is now easier to handle poisoned locks. The [`PoisonError`]
7595 type, returned by failing lock operations, exposes `into_inner`,
7596 `get_ref`, and `get_mut`, which all give access to the inner lock
7597 guard, and allow the poisoned lock to continue to operate. The
7598 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7599 poisoned lock without attempting to take the lock.
7600 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7601 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7602 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7603 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7605 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7611 * `rustc` employs smarter heuristics for guessing at [typos].
7612 * `rustc` emits more efficient code for [no-op conversions between
7613 unsafe pointers][nop].
7614 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7615 resulting in faster compile times and smaller code.
7617 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7618 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7619 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7620 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7621 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7622 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7623 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7624 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7625 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7626 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7627 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7628 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7629 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7630 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7631 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7632 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7633 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7634 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7635 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7636 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7637 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7638 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7639 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7640 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7641 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7642 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7643 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7644 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7645 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7646 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7647 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7648 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7649 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7650 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7651 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7652 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7653 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7654 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7655 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7656 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7657 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7658 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7659 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7660 [align]: https://github.com/rust-lang/rust/pull/25646
7661 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7662 [typos]: https://github.com/rust-lang/rust/pull/26087
7663 [nop]: https://github.com/rust-lang/rust/pull/26336
7664 [fat]: https://github.com/rust-lang/rust/pull/26411
7665 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7666 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7667 [packed]: https://github.com/rust-lang/rust/pull/25541
7668 [ad]: https://github.com/rust-lang/rust/pull/27382
7669 [win]: https://github.com/rust-lang/rust/pull/25350
7671 Version 1.1.0 (2015-06-25)
7672 =========================
7674 * ~850 changes, numerous bugfixes
7679 * The [`std::fs` module has been expanded][fs] to expand the set of
7680 functionality exposed:
7681 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7682 don't incur a syscall on some platforms.
7683 * A `symlink_metadata` function has been added.
7684 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7685 access to all underlying information.
7686 * The compiler now contains extended explanations of many errors. When an error
7687 with an explanation occurs the compiler suggests using the `--explain` flag
7688 to read the explanation. Error explanations are also [available online][err-index].
7689 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7690 well as other work, the time to bootstrap the compiler decreased by
7696 * The [`str::split_whitespace`] method splits a string on unicode
7697 whitespace boundaries.
7698 * On both Windows and Unix, new extension traits provide conversion of
7699 I/O types to and from the underlying system handles. On Unix, these
7700 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7701 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7702 `TcpListener`, and `UpdSocket`. Further implementations for
7703 `std::process` will be stabilized later.
7704 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7705 Windows, symlinks can be created with
7706 `std::os::windows::symlink_dir` and
7707 `std::os::windows::symlink_file`.
7708 * The `mpsc::Receiver` type can now be converted into an iterator with
7709 `into_iter` on the [`IntoIterator`] trait.
7710 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7711 implementation of the [`From`] trait.
7712 * The `Debug` implementation for `RangeFull` [creates output that is
7713 more consistent with other implementations][rf].
7714 * [`Debug` is implemented for `File`][file].
7715 * The `Default` implementation for `Arc` [no longer requires `Sync +
7717 * [The `Iterator` methods `count`, `nth`, and `last` have been
7718 overridden for slices to have O(1) performance instead of O(n)][si].
7719 * Incorrect handling of paths on Windows has been improved in both the
7720 compiler and the standard library.
7721 * [`AtomicPtr` gained a `Default` implementation][ap].
7722 * In accordance with Rust's policy on arithmetic overflow `abs` now
7723 [panics on overflow when debug assertions are enabled][abs].
7724 * The [`Cloned`] iterator, which was accidentally left unstable for
7725 1.0 [has been stabilized][c].
7726 * The [`Incoming`] iterator, which iterates over incoming TCP
7727 connections, and which was accidentally unnamable in 1.0, [is now
7728 properly exported][inc].
7729 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7730 `sift_up` or `sift_down` panic][bh].
7731 * The [`split_off`] method of `LinkedList` [no longer corrupts
7732 the list in certain scenarios][ll].
7737 * Type checking performance [has improved notably][sk] with
7738 [multiple improvements][pre].
7739 * The compiler [suggests code changes][ch] for more errors.
7740 * rustc and it's build system have experimental support for [building
7741 toolchains against MUSL][m] instead of glibc on Linux.
7742 * The compiler defines the `target_env` cfg value, which is used for
7743 distinguishing toolchains that are otherwise for the same
7744 platform. Presently this is set to `gnu` for common GNU Linux
7745 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7746 * The [`cargo rustc`][crc] command invokes a build with custom flags
7748 * [Android executables are always position independent][pie].
7749 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7752 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7753 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7754 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7755 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7756 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7757 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7758 [rf]: https://github.com/rust-lang/rust/pull/24491
7759 [err-index]: https://doc.rust-lang.org/error-index.html
7760 [sk]: https://github.com/rust-lang/rust/pull/24615
7761 [pre]: https://github.com/rust-lang/rust/pull/25323
7762 [file]: https://github.com/rust-lang/rust/pull/24598
7763 [ch]: https://github.com/rust-lang/rust/pull/24683
7764 [arc]: https://github.com/rust-lang/rust/pull/24695
7765 [si]: https://github.com/rust-lang/rust/pull/24701
7766 [ap]: https://github.com/rust-lang/rust/pull/24834
7767 [m]: https://github.com/rust-lang/rust/pull/24777
7768 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7769 [crc]: https://github.com/rust-lang/cargo/pull/1568
7770 [pie]: https://github.com/rust-lang/rust/pull/24953
7771 [abs]: https://github.com/rust-lang/rust/pull/25441
7772 [c]: https://github.com/rust-lang/rust/pull/25496
7773 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7774 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7775 [inc]: https://github.com/rust-lang/rust/pull/25522
7776 [bh]: https://github.com/rust-lang/rust/pull/25856
7777 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7778 [ll]: https://github.com/rust-lang/rust/pull/26022
7779 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7780 [drop]: https://github.com/rust-lang/rust/pull/24935
7782 Version 1.0.0 (2015-05-15)
7783 ========================
7785 * ~1500 changes, numerous bugfixes
7790 * The vast majority of the standard library is now `#[stable]`. It is
7791 no longer possible to use unstable features with a stable build of
7793 * Many popular crates on [crates.io] now work on the stable release
7795 * Arithmetic on basic integer types now [checks for overflow in debug
7801 * Several [restrictions have been added to trait coherence][coh] in
7802 order to make it easier for upstream authors to change traits
7803 without breaking downstream code.
7804 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7805 improve error messages and macro behavior. For example, `0b1234` is
7806 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7807 * Trait bounds [are always invariant][inv], eliminating the need for
7808 the `PhantomFn` and `MarkerTrait` lang items, which have been
7810 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7811 "foo" as bar` syntax has been replaced with `extern crate foo as
7812 bar`, and Cargo now automatically translates "-" in *package* names
7813 to underscore for the crate name.
7814 * [Lifetime shadowing is an error][lt].
7815 * [`Send` no longer implies `'static`][send-rfc].
7816 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7817 `MyType::default()`.
7818 * Primitive types [now have inherent methods][prim-inherent],
7819 obviating the need for extension traits like `SliceExt`.
7820 * Methods with `Self: Sized` in their `where` clause are [considered
7821 object-safe][self-sized], allowing many extension traits like
7822 `IteratorExt` to be merged into the traits they extended.
7823 * You can now [refer to associated types][assoc-where] whose
7824 corresponding trait bounds appear only in a `where` clause.
7825 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7826 like `Send` and `Sync` are now library-defined.
7827 * A [Reflect trait][reflect] was introduced, which means that
7828 downcasting via the `Any` trait is effectively limited to concrete
7829 types. This helps retain the potentially-important "parametricity"
7830 property: generic code cannot behave differently for different type
7831 arguments except in minor ways.
7832 * The `unsafe_destructor` feature is now deprecated in favor of the
7833 [new `dropck`][dropck]. This change is a major reduction in unsafe
7839 * The `thread_local` module [has been renamed to `std::thread`][th].
7840 * The methods of `IteratorExt` [have been moved to the `Iterator`
7842 * Several traits that implement Rust's conventions for type
7843 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7844 [centralized in the `std::convert` module][con].
7845 * The `FromError` trait [was removed in favor of `From`][fe].
7846 * The basic sleep function [has moved to
7847 `std::thread::sleep_ms`][slp].
7848 * The `splitn` function now takes an `n` parameter that represents the
7849 number of items yielded by the returned iterator [instead of the
7850 number of 'splits'][spl].
7851 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7852 * [Derived implementations of `PartialOrd` now order enums according
7853 to their explicitly-assigned discriminants][po].
7854 * [Methods for searching strings are generic over `Pattern`s][pat],
7855 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7857 * [In method resolution, object methods are resolved before inherent
7859 * [`String::from_str` has been deprecated in favor of the `From` impl,
7860 `String::from`][sf].
7861 * [`io::Error` implements `Sync`][ios].
7862 * [The `words` method on `&str` has been replaced with
7863 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7865 * The new path and IO modules are complete and `#[stable]`. This
7866 was the major library focus for this cycle.
7867 * The path API was [revised][path-normalize] to normalize `.`,
7868 adjusting the tradeoffs in favor of the most common usage.
7869 * A large number of remaining APIs in `std` were also stabilized
7870 during this cycle; about 75% of the non-deprecated API surface
7872 * The new [string pattern API][string-pattern] landed, which makes
7873 the string slice API much more internally consistent and flexible.
7874 * A new set of [generic conversion traits][conversion] replaced
7875 many existing ad hoc traits.
7876 * Generic numeric traits were [completely removed][num-traits]. This
7877 was made possible thanks to inherent methods for primitive types,
7878 and the removal gives maximal flexibility for designing a numeric
7879 hierarchy in the future.
7880 * The `Fn` traits are now related via [inheritance][fn-inherit]
7881 and provide ergonomic [blanket implementations][fn-blanket].
7882 * The `Index` and `IndexMut` traits were changed to
7883 [take the index by value][index-value], enabling code like
7884 `hash_map["string"]` to work.
7885 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7886 `Copy` data is known to be `Clone` as well.
7891 * Many errors now have extended explanations that can be accessed with
7892 the `--explain` flag to `rustc`.
7893 * Many new examples have been added to the standard library
7895 * rustdoc has received a number of improvements focused on completion
7897 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7898 * Much headway was made on ecosystem-wide CI, making it possible
7899 to [compare builds for breakage][ci-compare].
7902 [crates.io]: http://crates.io
7903 [clo]: https://github.com/rust-lang/rust/pull/24034
7904 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7905 [con]: https://github.com/rust-lang/rust/pull/23875
7906 [cr]: https://github.com/rust-lang/rust/pull/23419
7907 [fe]: https://github.com/rust-lang/rust/pull/23879
7908 [ie]: https://github.com/rust-lang/rust/pull/23300
7909 [inv]: https://github.com/rust-lang/rust/pull/23938
7910 [ios]: https://github.com/rust-lang/rust/pull/24133
7911 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7912 [lt]: https://github.com/rust-lang/rust/pull/24057
7913 [meth]: https://github.com/rust-lang/rust/pull/24056
7914 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7915 [po]: https://github.com/rust-lang/rust/pull/24270
7916 [sf]: https://github.com/rust-lang/rust/pull/24517
7917 [slp]: https://github.com/rust-lang/rust/pull/23949
7918 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7919 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7920 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7921 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7922 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7923 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7924 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7925 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7926 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7927 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7928 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7929 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7930 [reflect]: https://github.com/rust-lang/rust/pull/23712
7931 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7932 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7933 [index-value]: https://github.com/rust-lang/rust/pull/23601
7934 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7935 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7936 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7937 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7938 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7939 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7942 Version 1.0.0-alpha.2 (2015-02-20)
7943 =====================================
7945 * ~1300 changes, numerous bugfixes
7949 * The various I/O modules were [overhauled][io-rfc] to reduce
7950 unnecessary abstractions and provide better interoperation with
7951 the underlying platform. The old `io` module remains temporarily
7953 * The standard library now [participates in feature gating][feat],
7954 so use of unstable libraries now requires a `#![feature(...)]`
7955 attribute. The impact of this change is [described on the
7956 forum][feat-forum]. [RFC][feat-rfc].
7960 * `for` loops [now operate on the `IntoIterator` trait][into],
7961 which eliminates the need to call `.iter()`, etc. to iterate
7962 over collections. There are some new subtleties to remember
7963 though regarding what sort of iterators various types yield, in
7964 particular that `for foo in bar { }` yields values from a move
7965 iterator, destroying the original collection. [RFC][into-rfc].
7966 * Objects now have [default lifetime bounds][obj], so you don't
7967 have to write `Box<Trait+'static>` when you don't care about
7968 storing references. [RFC][obj-rfc].
7969 * In types that implement `Drop`, [lifetimes must outlive the
7970 value][drop]. This will soon make it possible to safely
7971 implement `Drop` for types where `#[unsafe_destructor]` is now
7972 required. Read the [gorgeous RFC][drop-rfc] for details.
7973 * The fully qualified <T as Trait>::X syntax lets you set the Self
7974 type for a trait method or associated type. [RFC][ufcs-rfc].
7975 * References to types that implement `Deref<U>` now [automatically
7976 coerce to references][deref] to the dereferenced type `U`,
7977 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7978 should eliminate many unsightly uses of `&*`, as when converting
7979 from references to vectors into references to
7980 slices. [RFC][deref-rfc].
7981 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7982 `|:|`) is obsolete and closure kind is inferred from context.
7983 * [`Self` is a keyword][Self].
7987 * The `Show` and `String` formatting traits [have been
7988 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7989 their related purposes. Automatically getting a string
7990 conversion to use with `format!("{:?}", something_to_debug)` is
7991 now written `#[derive(Debug)]`.
7992 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7993 OsStr}`, provide strings in platform-specific encodings for easier
7994 interop with system APIs. [RFC][osstr-rfc].
7995 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7996 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7997 creating raw pointers.
8001 * Certain long error messages of the form 'expected foo found bar'
8002 are now [split neatly across multiple
8003 lines][multiline]. Examples in the PR.
8004 * On Unix Rust can be [uninstalled][un] by running
8005 `/usr/local/lib/rustlib/uninstall.sh`.
8006 * The `#[rustc_on_unimplemented]` attribute, requiring the
8007 'on_unimplemented' feature, lets rustc [display custom error
8008 messages when a trait is expected to be implemented for a type
8013 * Rust is tested against a [LALR grammar][lalr], which parses
8014 almost all the Rust files that rustc does.
8016 [boxraw]: https://github.com/rust-lang/rust/pull/21318
8017 [close]: https://github.com/rust-lang/rust/pull/21843
8018 [deref]: https://github.com/rust-lang/rust/pull/21351
8019 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
8020 [drop]: https://github.com/rust-lang/rust/pull/21972
8021 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8022 [feat]: https://github.com/rust-lang/rust/pull/21248
8023 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
8024 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
8025 [fmt]: https://github.com/rust-lang/rust/pull/21457
8026 [into]: https://github.com/rust-lang/rust/pull/20790
8027 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
8028 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8029 [lalr]: https://github.com/rust-lang/rust/pull/21452
8030 [multiline]: https://github.com/rust-lang/rust/pull/19870
8031 [obj]: https://github.com/rust-lang/rust/pull/22230
8032 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
8033 [onun]: https://github.com/rust-lang/rust/pull/20889
8034 [osstr]: https://github.com/rust-lang/rust/pull/21488
8035 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
8036 [Self]: https://github.com/rust-lang/rust/pull/22158
8037 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
8038 [un]: https://github.com/rust-lang/rust/pull/22256
8041 Version 1.0.0-alpha (2015-01-09)
8042 ==================================
8044 * ~2400 changes, numerous bugfixes
8048 * The language itself is considered feature complete for 1.0,
8049 though there will be many usability improvements and bugfixes
8050 before the final release.
8051 * Nearly 50% of the public API surface of the standard library has
8052 been declared 'stable'. Those interfaces are unlikely to change
8054 * The long-running debate over integer types has been
8055 [settled][ints]: Rust will ship with types named `isize` and
8056 `usize`, rather than `int` and `uint`, for pointer-sized
8057 integers. Guidelines will be rolled out during the alpha cycle.
8058 * Most crates that are not `std` have been moved out of the Rust
8059 distribution into the Cargo ecosystem so they can evolve
8060 separately and don't need to be stabilized as quickly, including
8061 'time', 'getopts', 'num', 'regex', and 'term'.
8062 * Documentation continues to be expanded with more API coverage, more
8063 examples, and more in-depth explanations. The guides have been
8064 consolidated into [The Rust Programming Language][trpl].
8065 * "[Rust By Example][rbe]" is now maintained by the Rust team.
8066 * All official Rust binary installers now come with [Cargo], the
8067 Rust package manager.
8071 * Closures have been [completely redesigned][unboxed] to be
8072 implemented in terms of traits, can now be used as generic type
8073 bounds and thus monomorphized and inlined, or via an opaque
8074 pointer (boxed) as in the old system. The new system is often
8075 referred to as 'unboxed' closures.
8076 * Traits now support [associated types][assoc], allowing families
8077 of related types to be defined together and used generically in
8079 * Enum variants are [namespaced by their type names][enum].
8080 * [`where` clauses][where] provide a more versatile and attractive
8081 syntax for specifying generic bounds, though the previous syntax
8083 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
8085 * Rust [no longer has a runtime][rt] of any description, and only
8086 supports OS threads, not green threads.
8087 * At long last, Rust has been overhauled for 'dynamically-sized
8088 types' ([DST]), which integrates 'fat pointers' (object types,
8089 arrays, and `str`) more deeply into the type system, making it
8091 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
8092 `..j` that produce range types and which, when combined with the
8093 `Index` operator and multidispatch, leads to a convenient slice
8095 * The new range syntax revealed an ambiguity in the fixed-length
8096 array syntax, so now fixed length arrays [are written `[T;
8098 * The `Copy` trait is no longer implemented automatically. Unsafe
8099 pointers no longer implement `Sync` and `Send` so types
8100 containing them don't automatically either. `Sync` and `Send`
8101 are now 'unsafe traits' so one can "forcibly" implement them via
8102 `unsafe impl` if a type confirms to the requirements for them
8103 even though the internals do not (e.g. structs containing unsafe
8104 pointers like `Arc`). These changes are intended to prevent some
8105 footguns and are collectively known as [opt-in built-in
8106 traits][oibit] (though `Sync` and `Send` will soon become pure
8107 library types unknown to the compiler).
8108 * Operator traits now take their operands [by value][ops], and
8109 comparison traits can use multidispatch to compare one type
8110 against multiple other types, allowing e.g. `String` to be
8111 compared with `&str`.
8112 * `if let` and `while let` are no longer feature-gated.
8113 * Rust has adopted a more [uniform syntax for escaping unicode
8114 characters][unicode].
8115 * `macro_rules!` [has been declared stable][mac]. Though it is a
8116 flawed system it is sufficiently popular that it must be usable
8117 for 1.0. Effort has gone into [future-proofing][mac-future] it
8118 in ways that will allow other macro systems to be developed in
8119 parallel, and won't otherwise impact the evolution of the
8121 * The prelude has been [pared back significantly][prelude] such
8122 that it is the minimum necessary to support the most pervasive
8123 code patterns, and through [generalized where clauses][where]
8124 many of the prelude extension traits have been consolidated.
8125 * Rust's rudimentary reflection [has been removed][refl], as it
8126 incurred too much code generation for little benefit.
8127 * [Struct variants][structvars] are no longer feature-gated.
8128 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
8129 known as 'higher-ranked trait bounds', this crucially allows
8130 unboxed closures to work.
8131 * Macros invocations surrounded by parens or square brackets and
8132 not terminated by a semicolon are [parsed as
8133 expressions][macros], which makes expressions like `vec![1i32,
8134 2, 3].len()` work as expected.
8135 * Trait objects now implement their traits automatically, and
8136 traits that can be coerced to objects now must be [object
8138 * Automatically deriving traits is now done with `#[derive(...)]`
8139 not `#[deriving(...)]` for [consistency with other naming
8140 conventions][derive].
8141 * Importing the containing module or enum at the same time as
8142 items or variants they contain is [now done with `self` instead
8143 of `mod`][self], as in use `foo::{self, bar}`
8144 * Glob imports are no longer feature-gated.
8145 * The `box` operator and `box` patterns have been feature-gated
8146 pending a redesign. For now unique boxes should be allocated
8147 like other containers, with `Box::new`.
8151 * A [series][coll1] of [efforts][coll2] to establish
8152 [conventions][coll3] for collections types has resulted in API
8153 improvements throughout the standard library.
8154 * New [APIs for error handling][err] provide ergonomic interop
8155 between error types, and [new conventions][err-conv] describe
8156 more clearly the recommended error handling strategies in Rust.
8157 * The `fail!` macro has been renamed to [`panic!`][panic] so that
8158 it is easier to discuss failure in the context of error handling
8159 without making clarifications as to whether you are referring to
8160 the 'fail' macro or failure more generally.
8161 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
8162 syscall when available.
8163 * The 'serialize' crate has been renamed 'rustc-serialize' and
8164 moved out of the distribution to Cargo. Although it is widely
8165 used now, it is expected to be superseded in the near future.
8166 * The `Show` formatter, typically implemented with
8167 `#[derive(Show)]` is [now requested with the `{:?}`
8168 specifier][show] and is intended for use by all types, for uses
8169 such as `println!` debugging. The new `String` formatter must be
8170 implemented by hand, uses the `{}` specifier, and is intended
8171 for full-fidelity conversions of things that can logically be
8172 represented as strings.
8176 * [Flexible target specification][flex] allows rustc's code
8177 generation to be configured to support otherwise-unsupported
8179 * Rust comes with rust-gdb and rust-lldb scripts that launch their
8180 respective debuggers with Rust-appropriate pretty-printing.
8181 * The Windows installation of Rust is distributed with the
8182 MinGW components currently required to link binaries on that
8187 * Nullable enum optimizations have been extended to more types so
8188 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
8189 space than the inner types themselves.
8190 * Work has begun on supporting AArch64.
8192 [Cargo]: https://crates.io
8193 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
8194 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
8195 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
8196 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
8197 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
8198 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
8199 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
8200 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
8201 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
8202 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
8203 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
8204 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
8205 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
8206 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
8207 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
8208 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
8209 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
8210 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
8211 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
8212 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
8213 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
8214 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
8215 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
8216 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
8217 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
8218 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
8219 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
8220 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
8221 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
8222 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
8223 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
8224 [trpl]: https://doc.rust-lang.org/book/index.html
8225 [rbe]: http://rustbyexample.com/
8228 Version 0.12.0 (2014-10-09)
8229 =============================
8231 * ~1900 changes, numerous bugfixes
8235 * The introductory documentation (now called The Rust Guide) has
8236 been completely rewritten, as have a number of supplementary
8238 * Rust's package manager, Cargo, continues to improve and is
8239 sometimes considered to be quite awesome.
8240 * Many API's in `std` have been reviewed and updated for
8241 consistency with the in-development Rust coding
8242 guidelines. The standard library documentation tracks
8243 stabilization progress.
8244 * Minor libraries have been moved out-of-tree to the rust-lang org
8245 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
8246 be installed with Cargo.
8247 * Lifetime elision allows lifetime annotations to be left off of
8248 function declarations in many common scenarios.
8249 * Rust now works on 64-bit Windows.
8252 * Indexing can be overloaded with the `Index` and `IndexMut`
8254 * The `if let` construct takes a branch only if the `let` pattern
8255 matches, currently behind the 'if_let' feature gate.
8256 * 'where clauses', a more flexible syntax for specifying trait
8257 bounds that is more aesthetic, have been added for traits and
8258 free functions. Where clauses will in the future make it
8259 possible to constrain associated types, which would be
8260 impossible with the existing syntax.
8261 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
8262 the 'slicing_syntax' feature gate, and can be overloaded with
8263 the `Slice` or `SliceMut` traits.
8264 * The syntax for matching of sub-slices has been changed to use a
8265 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
8266 consistency with other uses of `..` and to future-proof
8267 potential additional uses of the syntax.
8268 * The syntax for matching inclusive ranges in patterns has changed
8269 from `0..3` to `0...4` to be consistent with the exclusive range
8271 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
8272 c]`) has been put behind the 'advanced_slice_patterns' feature
8273 gate and may be removed in the future.
8274 * Components of tuples and tuple structs can be extracted using
8275 the `value.0` syntax, currently behind the `tuple_indexing`
8277 * The `#[crate_id]` attribute is no longer supported; versioning
8278 is handled by the package manager.
8279 * Renaming crate imports are now written `extern crate foo as bar`
8280 instead of `extern crate bar = foo`.
8281 * Renaming use statements are now written `use foo as bar` instead
8283 * `let` and `match` bindings and argument names in macros are now
8285 * The new, more efficient, closure types ('unboxed closures') have
8286 been added under a feature gate, 'unboxed_closures'. These will
8287 soon replace the existing closure types, once higher-ranked
8288 trait lifetimes are added to the language.
8289 * `move` has been added as a keyword, for indicating closures
8290 that capture by value.
8291 * Mutation and assignment is no longer allowed in pattern guards.
8292 * Generic structs and enums can now have trait bounds.
8293 * The `Share` trait is now called `Sync` to free up the term
8294 'shared' to refer to 'shared reference' (the default reference
8296 * Dynamically-sized types have been mostly implemented,
8297 unifying the behavior of fat-pointer types with the rest of the
8299 * As part of dynamically-sized types, the `Sized` trait has been
8300 introduced, which qualifying types implement by default, and
8301 which type parameters expect by default. To specify that a type
8302 parameter does not need to be sized, write `<Sized? T>`. Most
8303 types are `Sized`, notable exceptions being unsized arrays
8304 (`[T]`) and trait types.
8305 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8306 * Lifetime bounds can now be applied to type parameters and object
8308 * The old, reference counted GC type, `Gc<T>` which was once
8309 denoted by the `@` sigil, has finally been removed. GC will be
8310 revisited in the future.
8313 * Library documentation has been improved for a number of modules.
8314 * Bit-vectors, collections::bitv has been modernized.
8315 * The url crate is deprecated in favor of
8316 http://github.com/servo/rust-url, which can be installed with
8318 * Most I/O stream types can be cloned and subsequently closed from
8320 * A `std::time::Duration` type has been added for use in I/O
8321 methods that rely on timers, as well as in the 'time' crate's
8322 `Timespec` arithmetic.
8323 * The runtime I/O abstraction layer that enabled the green thread
8324 scheduler to do non-thread-blocking I/O has been removed, along
8325 with the libuv-based implementation employed by the green thread
8326 scheduler. This will greatly simplify the future I/O work.
8327 * `collections::btree` has been rewritten to have a more
8328 idiomatic and efficient design.
8331 * rustdoc output now indicates the stability levels of API's.
8332 * The `--crate-name` flag can specify the name of the crate
8333 being compiled, like `#[crate_name]`.
8334 * The `-C metadata` specifies additional metadata to hash into
8335 symbol names, and `-C extra-filename` specifies additional
8336 information to put into the output filename, for use by the
8337 package manager for versioning.
8338 * debug info generation has continued to improve and should be
8339 more reliable under both gdb and lldb.
8340 * rustc has experimental support for compiling in parallel
8341 using the `-C codegen-units` flag.
8342 * rustc no longer encodes rpath information into binaries by
8346 * Stack usage has been optimized with LLVM lifetime annotations.
8347 * Official Rust binaries on Linux are more compatible with older
8348 kernels and distributions, built on CentOS 5.10.
8351 Version 0.11.0 (2014-07-02)
8352 ==========================
8354 * ~1700 changes, numerous bugfixes
8357 * ~[T] has been removed from the language. This type is superseded by
8359 * ~str has been removed from the language. This type is superseded by
8361 * ~T has been removed from the language. This type is superseded by the
8363 * @T has been removed from the language. This type is superseded by the
8364 standard library's std::gc::Gc<T> type.
8365 * Struct fields are now all private by default.
8366 * Vector indices and shift amounts are both required to be a `uint`
8367 instead of any integral type.
8368 * Byte character, byte string, and raw byte string literals are now all
8369 supported by prefixing the normal literal with a `b`.
8370 * Multiple ABIs are no longer allowed in an ABI string
8371 * The syntax for lifetimes on closures/procedures has been tweaked
8372 slightly: `<'a>|A, B|: 'b + K -> T`
8373 * Floating point modulus has been removed from the language; however it
8374 is still provided by a library implementation.
8375 * Private enum variants are now disallowed.
8376 * The `priv` keyword has been removed from the language.
8377 * A closure can no longer be invoked through a &-pointer.
8378 * The `use foo, bar, baz;` syntax has been removed from the language.
8379 * The transmute intrinsic no longer works on type parameters.
8380 * Statics now allow blocks/items in their definition.
8381 * Trait bounds are separated from objects with + instead of : now.
8382 * Objects can no longer be read while they are mutably borrowed.
8383 * The address of a static is now marked as insignificant unless the
8384 #[inline(never)] attribute is placed it.
8385 * The #[unsafe_destructor] attribute is now behind a feature gate.
8386 * Struct literals are no longer allowed in ambiguous positions such as
8387 if, while, match, and for..in.
8388 * Declaration of lang items and intrinsics are now feature-gated by
8390 * Integral literals no longer default to `int`, and floating point
8391 literals no longer default to `f64`. Literals must be suffixed with an
8392 appropriate type if inference cannot determine the type of the
8394 * The Box<T> type is no longer implicitly borrowed to &mut T.
8395 * Procedures are now required to not capture borrowed references.
8398 * The standard library is now a "facade" over a number of underlying
8399 libraries. This means that development on the standard library should
8400 be speedier due to smaller crates, as well as a clearer line between
8402 * A new library, libcore, lives under the standard library's facade
8403 which is Rust's "0-assumption" library, suitable for embedded and
8404 kernel development for example.
8405 * A regex crate has been added to the standard distribution. This crate
8406 includes statically compiled regular expressions.
8407 * The unwrap/unwrap_err methods on Result require a Show bound for
8408 better error messages.
8409 * The return types of the std::comm primitives have been centralized
8410 around the Result type.
8411 * A number of I/O primitives have gained the ability to time out their
8413 * A number of I/O primitives have gained the ability to close their
8414 reading/writing halves to cancel pending operations.
8415 * Reverse iterator methods have been removed in favor of `rev()` on
8416 their forward-iteration counterparts.
8417 * A bitflags! macro has been added to enable easy interop with C and
8418 management of bit flags.
8419 * A debug_assert! macro is now provided which is disabled when
8420 `--cfg ndebug` is passed to the compiler.
8421 * A graphviz crate has been added for creating .dot files.
8422 * The std::cast module has been migrated into std::mem.
8423 * The std::local_data api has been migrated from freestanding functions
8424 to being based on methods.
8425 * The Pod trait has been renamed to Copy.
8426 * jemalloc has been added as the default allocator for types.
8427 * The API for allocating memory has been changed to use proper alignment
8428 and sized deallocation
8429 * Connecting a TcpStream or binding a TcpListener is now based on a
8430 string address and a u16 port. This allows connecting to a hostname as
8432 * The Reader trait now contains a core method, read_at_least(), which
8433 correctly handles many repeated 0-length reads.
8434 * The process-spawning API is now centered around a builder-style
8436 * The :? printing qualifier has been moved from the standard library to
8437 an external libdebug crate.
8438 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8439 have been renamed to Eq/Ord.
8440 * The select/plural methods have been removed from format!. The escapes
8441 for { and } have also changed from \{ and \} to {{ and }},
8443 * The TaskBuilder API has been re-worked to be a true builder, and
8444 extension traits for spawning native/green tasks have been added.
8447 * All breaking changes to the language or libraries now have their
8448 commit message annotated with `[breaking-change]` to allow for easy
8449 discovery of breaking changes.
8450 * The compiler will now try to suggest how to annotate lifetimes if a
8451 lifetime-related error occurs.
8452 * Debug info continues to be improved greatly with general bug fixes and
8453 better support for situations like link time optimization (LTO).
8454 * Usage of syntax extensions when cross-compiling has been fixed.
8455 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8456 -fdata-sections and --gc-sections has been enabled by default
8457 * The compiler is now stricter about where it will load module files
8458 from when a module is declared via `mod foo;`.
8459 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8460 Syntax extensions are now discovered via a "plugin registrar" type
8461 which will be extended in the future to other various plugins.
8462 * Lints have been restructured to allow for dynamically loadable lints.
8463 * A number of rustdoc improvements:
8464 * The HTML output has been visually redesigned.
8465 * Markdown is now powered by hoedown instead of sundown.
8466 * Searching heuristics have been greatly improved.
8467 * The search index has been reduced in size by a great amount.
8468 * Cross-crate documentation via `pub use` has been greatly improved.
8469 * Primitive types are now hyperlinked and documented.
8470 * Documentation has been moved from static.rust-lang.org/doc to
8472 * A new sandbox, play.rust-lang.org, is available for running and
8473 sharing rust code examples on-line.
8474 * Unused attributes are now more robustly warned about.
8475 * The dead_code lint now warns about unused struct fields.
8476 * Cross-compiling to iOS is now supported.
8477 * Cross-compiling to mipsel is now supported.
8478 * Stability attributes are now inherited by default and no longer apply
8479 to intra-crate usage, only inter-crate usage.
8480 * Error message related to non-exhaustive match expressions have been
8484 Version 0.10 (2014-04-03)
8485 =========================
8487 * ~1500 changes, numerous bugfixes
8490 * A new RFC process is now in place for modifying the language.
8491 * Patterns with `@`-pointers have been removed from the language.
8492 * Patterns with unique vectors (`~[T]`) have been removed from the
8494 * Patterns with unique strings (`~str`) have been removed from the
8496 * `@str` has been removed from the language.
8497 * `@[T]` has been removed from the language.
8498 * `@self` has been removed from the language.
8499 * `@Trait` has been removed from the language.
8500 * Headers on `~` allocations which contain `@` boxes inside the type for
8501 reference counting have been removed.
8502 * The semantics around the lifetimes of temporary expressions have changed,
8503 see #3511 and #11585 for more information.
8504 * Cross-crate syntax extensions are now possible, but feature gated. See
8505 #11151 for more information. This includes both `macro_rules!` macros as
8506 well as syntax extensions such as `format!`.
8507 * New lint modes have been added, and older ones have been turned on to be
8509 * Unnecessary parentheses
8512 * Uppercase variables
8513 * Publicly visible private types
8514 * `#[deriving]` with raw pointers
8515 * Unsafe functions can no longer be coerced to closures.
8516 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8517 * The `#[simd]` attribute is now behind a feature gate.
8518 * Visibility is no longer allowed on `extern crate` statements, and
8519 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8520 * Trailing commas are now allowed in argument lists and tuple patterns.
8521 * The `do` keyword has been removed, it is now a reserved keyword.
8522 * Default type parameters have been implemented, but are feature gated.
8523 * Borrowed variables through captures in closures are now considered soundly.
8524 * `extern mod` is now `extern crate`
8525 * The `Freeze` trait has been removed.
8526 * The `Share` trait has been added for types that can be shared among
8528 * Labels in macros are now hygienic.
8529 * Expression/statement macro invocations can be delimited with `{}` now.
8530 * Treatment of types allowed in `static mut` locations has been tweaked.
8531 * The `*` and `.` operators are now overloadable through the `Deref` and
8533 * `~Trait` and `proc` no longer have `Send` bounds by default.
8534 * Partial type hints are now supported with the `_` type marker.
8535 * An `Unsafe` type was introduced for interior mutability. It is now
8536 considered undefined to transmute from `&T` to `&mut T` without using the
8538 * The #[linkage] attribute was implemented for extern statics/functions.
8539 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8540 * `Pod` was renamed to `Copy`.
8543 * The `libextra` library has been removed. It has now been decomposed into
8544 component libraries with smaller and more focused nuggets of
8545 functionality. The full list of libraries can be found on the
8546 documentation index page.
8547 * std: `std::condition` has been removed. All I/O errors are now propagated
8548 through the `Result` type. In order to assist with error handling, a
8549 `try!` macro for unwrapping errors with an early return and a lint for
8550 unused results has been added. See #12039 for more information.
8551 * std: The `vec` module has been renamed to `slice`.
8552 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8553 This will become the only growable vector in the future.
8554 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8555 are now found at `std::io::BufferedReader` instead of
8556 `std::io::buffered::BufferedReader`.
8557 * std: `print` and `println` are no longer in the prelude, the `print!` and
8558 `println!` macros are intended to be used instead.
8559 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8560 attempts to statically prevent cycles.
8561 * std: The standard distribution is adopting the policy of pushing failure
8562 to the user rather than failing in libraries. Many functions (such as
8563 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8564 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8565 deriving mode: `#[deriving(Show)]`.
8566 * std: `ToStr` is now implemented for all types implementing `Show`.
8567 * std: The formatting trait methods now take `&self` instead of `&T`
8568 * std: The `invert()` method on iterators has been renamed to `rev()`
8569 * std: `std::num` has seen a reduction in the genericity of its traits,
8570 consolidating functionality into a few core traits.
8571 * std: Backtraces are now printed on task failure if the environment
8572 variable `RUST_BACKTRACE` is present.
8573 * std: Naming conventions for iterators have been standardized. More details
8574 can be found on the wiki's style guide.
8575 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8576 still implement the function.
8577 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8578 * std: `assert_approx_eq!` has been removed
8579 * std: The `e` and `E` formatting specifiers for floats have been added to
8580 print them in exponential notation.
8581 * std: The `Times` trait has been removed
8582 * std: Indications of variance and opting out of builtin bounds is done
8583 through marker types in `std::kinds::marker` now
8584 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8585 `#[deriving(Hash)]` is now possible.
8586 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8587 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8588 * std: `Chan::new` is now `channel()`.
8589 * std: A new synchronous channel type has been implemented.
8590 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8591 * std: `hashmap` and `trie` have been moved to `libcollections`
8592 * std: `run` has been rolled into `io::process`
8593 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8594 * std: The equality and comparison traits have seen some reorganization.
8595 * std: `rand` has moved to `librand`.
8596 * std: `to_{lower,upper}case` has been implemented for `char`.
8597 * std: Logging has been moved to `liblog`.
8598 * collections: `HashMap` has been rewritten for higher performance and less
8600 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8601 it can be booted manually. The runtime guide has more information and
8603 * native: All I/O functionality except signals has been implemented.
8604 * green: Task spawning with `libgreen` has been optimized with stack caching
8605 and various trimming of code.
8606 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8607 * sync: The `extra::sync` module has been updated to modern rust (and moved
8608 to the `sync` library), tweaking and improving various interfaces while
8609 dropping redundant functionality.
8610 * sync: A new `Barrier` type has been added to the `sync` library.
8611 * sync: An efficient mutex for native and green tasks has been implemented.
8612 * serialize: The `base64` module has seen some improvement. It treats
8613 newlines better, has non-string error values, and has seen general
8615 * fourcc: A `fourcc!` macro was introduced
8616 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8617 hexadecimal literal.
8620 * `rustpkg` has been deprecated and removed from the main repository. Its
8621 replacement, `cargo`, is under development.
8622 * Nightly builds of rust are now available
8623 * The memory usage of rustc has been improved many times throughout this
8625 * The build process supports disabling rpath support for the rustc binary
8627 * Code generation has improved in some cases, giving more information to the
8628 LLVM optimization passes to enable more extensive optimizations.
8629 * Debuginfo compatibility with lldb on OSX has been restored.
8630 * The master branch is now gated on an android bot, making building for
8631 android much more reliable.
8632 * Output flags have been centralized into one `--emit` flag.
8633 * Crate type flags have been centralized into one `--crate-type` flag.
8634 * Codegen flags have been consolidated behind a `-C` flag.
8635 * Linking against outdated crates now has improved error messages.
8636 * Error messages with lifetimes will often suggest how to annotate the
8637 function to fix the error.
8638 * Many more types are documented in the standard library, and new guides
8640 * Many `rustdoc` improvements:
8641 * code blocks are syntax highlighted.
8642 * render standalone markdown files.
8643 * the --test flag tests all code blocks by default.
8644 * exported macros are displayed.
8645 * re-exported types have their documentation inlined at the location of the
8647 * search works across crates that have been rendered to the same output
8651 Version 0.9 (2014-01-09)
8652 ==========================
8654 * ~1800 changes, numerous bugfixes
8657 * The `float` type has been removed. Use `f32` or `f64` instead.
8658 * A new facility for enabling experimental features (feature gating) has
8659 been added, using the crate-level `#[feature(foo)]` attribute.
8660 * Managed boxes (@) are now behind a feature gate
8661 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8662 standard library's `Gc` or `Rc` types instead.
8663 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8664 * Jumping back to the top of a loop is now done with `continue` instead of
8666 * Strings can no longer be mutated through index assignment.
8667 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8668 hash delimiters, as in `r###"foo"###`.
8669 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8671 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8672 * `@fn`s have been removed.
8673 * `do` only works with procs in order to make it obvious what the cost
8675 * Single-element tuple-like structs can no longer be dereferenced to
8676 obtain the inner value. A more comprehensive solution for overloading
8677 the dereference operator will be provided in the future.
8678 * The `#[link(...)]` attribute has been replaced with
8679 `#[crate_id = "name#vers"]`.
8680 * Empty `impl`s must be terminated with empty braces and may not be
8681 terminated with a semicolon.
8682 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8683 no longer has any special meaning.
8684 * The old `fmt!` string formatting macro has been removed.
8685 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8686 `print!` and `println!`.
8687 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8688 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8689 `extern mod foo = "bar"` instead.
8690 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8691 * Macros can have attributes.
8692 * Macros can expand to items with attributes.
8693 * Macros can expand to multiple items.
8694 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8695 * Comments may be nested.
8696 * Values automatically coerce to trait objects they implement, without
8698 * Enum discriminants are no longer an entire word but as small as needed to
8699 contain all the variants. The `repr` attribute can be used to override
8700 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8701 `#[repr(C)]` to match C enums.
8702 * Non-string literals are not allowed in attributes (they never worked).
8703 * The FFI now supports variadic functions.
8704 * Octal numeric literals, as in `0o7777`.
8705 * The `concat!` syntax extension performs compile-time string concatenation.
8706 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8707 removed as Rust no longer uses segmented stacks.
8708 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8709 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8710 not `*`; ignoring remaining fields of a struct is also done with `..`,
8711 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8712 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8713 * `rustc` supports the "system" calling convention, which defaults to the
8714 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8716 * The `type_overflow` lint (default: warn) checks literals for overflow.
8717 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8718 * The `attribute_usage` lint (default: warn) warns about unknown
8720 * The `unknown_features` lint (default: warn) warns about unknown
8722 * The `dead_code` lint (default: warn) checks for dead code.
8723 * Rust libraries can be linked statically to one another
8724 * `#[link_args]` is behind the `link_args` feature gate.
8725 * Native libraries are now linked with `#[link(name = "foo")]`
8726 * Native libraries can be statically linked to a rust crate
8727 (`#[link(name = "foo", kind = "static")]`).
8728 * Native OS X frameworks are now officially supported
8729 (`#[link(name = "foo", kind = "framework")]`).
8730 * The `#[thread_local]` attribute creates thread-local (not task-local)
8731 variables. Currently behind the `thread_local` feature gate.
8732 * The `return` keyword may be used in closures.
8733 * Types that can be copied via a memcpy implement the `Pod` kind.
8734 * The `cfg` attribute can now be used on struct fields and enum variants.
8737 * std: The `option` and `result` API's have been overhauled to make them
8738 simpler, more consistent, and more composable.
8739 * std: The entire `std::io` module has been replaced with one that is
8740 more comprehensive and that properly interfaces with the underlying
8741 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8743 * std: `io::util` contains a number of useful implementations of
8744 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8745 `ZeroReader`, `TeeReader`.
8746 * std: The reference counted pointer type `extra::rc` moved into std.
8747 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8748 just a wrapper around it).
8749 * std: The `Either` type has been removed.
8750 * std: `fmt::Default` can be implemented for any type to provide default
8751 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8752 * std: The `rand` API continues to be tweaked.
8753 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8754 on failure in gdb, is now named `rust_fail`.
8755 * std: The `each_key` and `each_value` methods on `HashMap` have been
8756 replaced by the `keys` and `values` iterators.
8757 * std: Functions dealing with type size and alignment have moved from the
8758 `sys` module to the `mem` module.
8759 * std: The `path` module was written and API changed.
8760 * std: `str::from_utf8` has been changed to cast instead of allocate.
8761 * std: `starts_with` and `ends_with` methods added to vectors via the
8762 `ImmutableEqVector` trait, which is in the prelude.
8763 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8764 if the index is out of bounds.
8765 * std: Task failure no longer propagates between tasks, as the model was
8766 complex, expensive, and incompatible with thread-based tasks.
8767 * std: The `Any` type can be used for dynamic typing.
8768 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8770 * std: Methods that produce iterators generally do not have an `_iter`
8772 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8773 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8774 * std: `util::ignore` renamed to `prelude::drop`.
8775 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8777 * std: `vec::raw` has seen a lot of cleanup and API changes.
8778 * std: The standard library no longer includes any C++ code, and very
8779 minimal C, eliminating the dependency on libstdc++.
8780 * std: Runtime scheduling and I/O functionality has been factored out into
8781 extensible interfaces and is now implemented by two different crates:
8782 libnative, for native threading and I/O; and libgreen, for green threading
8783 and I/O. This paves the way for using the standard library in more limited
8784 embedded environments.
8785 * std: The `comm` module has been rewritten to be much faster, have a
8786 simpler, more consistent API, and to work for both native and green
8788 * std: All libuv dependencies have been moved into the rustuv crate.
8789 * native: New implementations of runtime scheduling on top of OS threads.
8790 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8792 * green: The green thread scheduler and message passing types are almost
8794 * extra: The `flatpipes` module had bitrotted and was removed.
8795 * extra: All crypto functions have been removed and Rust now has a policy of
8796 not reimplementing crypto in the standard library. In the future crypto
8797 will be provided by external crates with bindings to established libraries.
8798 * extra: `c_vec` has been modernized.
8799 * extra: The `sort` module has been removed. Use the `sort` method on
8803 * The `rust` and `rusti` commands have been removed, due to lack of
8805 * `rustdoc` was completely rewritten.
8806 * `rustdoc` can test code examples in documentation.
8807 * `rustpkg` can test packages with the argument, 'test'.
8808 * `rustpkg` supports arbitrary dependencies, including C libraries.
8809 * `rustc`'s support for generating debug info is improved again.
8810 * `rustc` has better error reporting for unbalanced delimiters.
8811 * `rustc`'s JIT support was removed due to bitrot.
8812 * Executables and static libraries can be built with LTO (-Z lto)
8813 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8817 Version 0.8 (2013-09-26)
8818 ============================
8820 * ~2200 changes, numerous bugfixes
8823 * The `for` loop syntax has changed to work with the `Iterator` trait.
8824 * At long last, unwinding works on Windows.
8825 * Default methods are ready for use.
8826 * Many trait inheritance bugs fixed.
8827 * Owned and borrowed trait objects work more reliably.
8828 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8829 * rustc can omit emission of code for the `debug!` macro if it is passed
8831 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8832 for foo.rs, then foo/mod.rs, and will generate an error when both are
8834 * Strings no longer contain trailing nulls. The new `std::c_str` module
8835 provides new mechanisms for converting to C strings.
8836 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8837 * The FFI has been overhauled such that foreign functions are called directly,
8838 instead of through a stack-switching wrapper.
8839 * Calling a foreign function must be done through a Rust function with the
8840 `#[fixed_stack_segment]` attribute.
8841 * The `externfn!` macro can be used to declare both a foreign function and
8842 a `#[fixed_stack_segment]` wrapper at once.
8843 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8844 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8845 * `priv` is disallowed everywhere except for struct fields and enum variants.
8846 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8847 * `ref` bindings in irrefutable patterns work correctly now.
8848 * `char` is now prevented from containing invalid code points.
8849 * Casting to `bool` is no longer allowed.
8850 * `\0` is now accepted as an escape in chars and strings.
8851 * `yield` is a reserved keyword.
8852 * `typeof` is a reserved keyword.
8853 * Crates may be imported by URL with `extern mod foo = "url";`.
8854 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8855 * Static vectors can be initialized with repeating elements,
8856 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8857 * Static structs can be initialized with functional record update,
8858 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8859 * `cfg!` can be used to conditionally execute code based on the crate
8860 configuration, similarly to `#[cfg(...)]`.
8861 * The `unnecessary_qualification` lint detects unneeded module
8862 prefixes (default: allow).
8863 * Arithmetic operations have been implemented on the SIMD types in
8864 `std::unstable::simd`.
8865 * Exchange allocation headers were removed, reducing memory usage.
8866 * `format!` implements a completely new, extensible, and higher-performance
8867 string formatting system. It will replace `fmt!`.
8868 * `print!` and `println!` write formatted strings (using the `format!`
8869 extension) to stdout.
8870 * `write!` and `writeln!` write formatted strings (using the `format!`
8871 extension) to the new Writers in `std::rt::io`.
8872 * The library section in which a function or static is placed may
8873 be specified with `#[link_section = "..."]`.
8874 * The `proto!` syntax extension for defining bounded message protocols
8876 * `macro_rules!` is hygienic for `let` declarations.
8877 * The `#[export_name]` attribute specifies the name of a symbol.
8878 * `unreachable!` can be used to indicate unreachable code, and fails
8882 * std: Transitioned to the new runtime, written in Rust.
8883 * std: Added an experimental I/O library, `rt::io`, based on the new
8885 * std: A new generic `range` function was added to the prelude, replacing
8886 `uint::range` and friends.
8887 * std: `range_rev` no longer exists. Since range is an iterator it can be
8888 reversed with `range(lo, hi).invert()`.
8889 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8890 renamed to `unwrap_or`.
8891 * std: The `iterator` module was renamed to `iter`.
8892 * std: Integral types now support the `checked_add`, `checked_sub`, and
8893 `checked_mul` operations for detecting overflow.
8894 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8896 * std: Methods are standardizing on conventions for casting methods:
8897 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8899 * std: The `CString` type in `c_str` provides new ways to convert to and
8901 * std: `DoubleEndedIterator` can yield elements in two directions.
8902 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8904 * std: `str::from_bytes` renamed to `str::from_utf8`.
8905 * std: `pop_opt` and `shift_opt` methods added to vectors.
8906 * std: The task-local data interface no longer uses @, and keys are
8907 no longer function pointers.
8908 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8909 * std: Added `SharedPort` to `comm`.
8910 * std: `Eq` has a default method for `ne`; only `eq` is required
8912 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8913 is required in implementations.
8914 * std: `is_utf8` performance is improved, impacting many string functions.
8915 * std: `os::MemoryMap` provides cross-platform mmap.
8916 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8917 are not 'in-bounds' are considered undefined.
8918 * std: Many freestanding functions in `vec` removed in favor of methods.
8919 * std: Many freestanding functions on scalar types removed in favor of
8921 * std: Many options to task builders were removed since they don't make
8922 sense in the new scheduler design.
8923 * std: More containers implement `FromIterator` so can be created by the
8925 * std: More complete atomic types in `unstable::atomics`.
8926 * std: `comm::PortSet` removed.
8927 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8928 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8929 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8930 default implementations.
8931 * std: Various `from_str` functions were removed in favor of a generic
8932 `from_str` which is available in the prelude.
8933 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8934 * extra: `dlist`, the doubly-linked list was modernized.
8935 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8936 * extra: Added `glob` module, replacing `std::os::glob`.
8937 * extra: `rope` was removed.
8938 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8939 * extra: `net`, and `timer` were removed. The experimental replacements
8940 are `std::rt::io::net` and `std::rt::io::timer`.
8941 * extra: Iterators implemented for `SmallIntMap`.
8942 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8943 * extra: `SmallIntSet` removed. Use `BitvSet`.
8944 * extra: Performance of JSON parsing greatly improved.
8945 * extra: `semver` updated to SemVer 2.0.0.
8946 * extra: `term` handles more terminals correctly.
8947 * extra: `dbg` module removed.
8948 * extra: `par` module removed.
8949 * extra: `future` was cleaned up, with some method renames.
8950 * extra: Most free functions in `getopts` were converted to methods.
8953 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8954 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8955 similarly to gcc's `--march` flag.
8956 * rustc's performance compiling small crates is much better.
8957 * rustpkg has received many improvements.
8958 * rustpkg supports git tags as package IDs.
8959 * rustpkg builds into target-specific directories so it can be used for
8961 * The number of concurrent test tasks is controlled by the environment
8962 variable RUST_TEST_TASKS.
8963 * The test harness can now report metrics for benchmarks.
8964 * All tools have man pages.
8965 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8966 * The runtime uses jemalloc for allocations.
8967 * Segmented stacks are temporarily disabled as part of the transition to
8968 the new runtime. Stack overflows are possible!
8969 * A new documentation backend, rustdoc_ng, is available for use. It is
8970 still invoked through the normal `rustdoc` command.
8973 Version 0.7 (2013-07-03)
8974 =======================
8976 * ~2000 changes, numerous bugfixes
8979 * `impl`s no longer accept a visibility qualifier. Put them on methods
8981 * The borrow checker has been rewritten with flow-sensitivity, fixing
8982 many bugs and inconveniences.
8983 * The `self` parameter no longer implicitly means `&'self self`,
8984 and can be explicitly marked with a lifetime.
8985 * Overloadable compound operators (`+=`, etc.) have been temporarily
8986 removed due to bugs.
8987 * The `for` loop protocol now requires `for`-iterators to return `bool`
8988 so they compose better.
8989 * The `Durable` trait is replaced with the `'static` bounds.
8990 * Trait default methods work more often.
8991 * Structs with the `#[packed]` attribute have byte alignment and
8992 no padding between fields.
8993 * Type parameters bound by `Copy` must now be copied explicitly with
8995 * It is now illegal to move out of a dereferenced unsafe pointer.
8996 * `Option<~T>` is now represented as a nullable pointer.
8997 * `@mut` does dynamic borrow checks correctly.
8998 * The `main` function is only detected at the topmost level of the crate.
8999 The `#[main]` attribute is still valid anywhere.
9000 * Struct fields may no longer be mutable. Use inherited mutability.
9001 * The `#[no_send]` attribute makes a type that would otherwise be
9003 * The `#[no_freeze]` attribute makes a type that would otherwise be
9005 * Unbounded recursion will abort the process after reaching the limit
9006 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
9007 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
9008 are never implicitly copyable.
9009 * `#[static_assert]` makes compile-time assertions about static bools.
9010 * At long last, 'argument modes' no longer exist.
9011 * The rarely used `use mod` statement no longer exists.
9014 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
9016 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
9017 `Rand`, `Zero` and `ToStr` can all be automatically derived with
9019 * The `bytes!` macro returns a vector of bytes for string, u8, char,
9020 and unsuffixed integer literals.
9023 * The `core` crate was renamed to `std`.
9024 * The `std` crate was renamed to `extra`.
9025 * More and improved documentation.
9026 * std: `iterator` module for external iterator objects.
9027 * Many old-style (internal, higher-order function) iterators replaced by
9028 implementations of `Iterator`.
9029 * std: Many old internal vector and string iterators,
9030 incl. `any`, `all`. removed.
9031 * std: The `finalize` method of `Drop` renamed to `drop`.
9032 * std: The `drop` method now takes `&mut self` instead of `&self`.
9033 * std: The prelude no longer re-exports any modules, only types and traits.
9034 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
9035 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
9036 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
9037 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
9038 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
9039 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
9040 * std: Many types implement `Clone`.
9041 * std: `path` type renamed to `Path`.
9042 * std: `mut` module and `Mut` type removed.
9043 * std: Many standalone functions removed in favor of methods and iterators
9044 in `vec`, `str`. In the future methods will also work as functions.
9045 * std: `reinterpret_cast` removed. Use `transmute`.
9046 * std: ascii string handling in `std::ascii`.
9047 * std: `Rand` is implemented for ~/@.
9048 * std: `run` module for spawning processes overhauled.
9049 * std: Various atomic types added to `unstable::atomic`.
9050 * std: Various types implement `Zero`.
9051 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
9052 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
9053 * std: Added `os::mkdir_recursive`.
9054 * std: Added `os::glob` function performs filesystems globs.
9055 * std: `FuzzyEq` renamed to `ApproxEq`.
9056 * std: `Map` now defines `pop` and `swap` methods.
9057 * std: `Cell` constructors converted to static methods.
9058 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
9059 * extra: `flate` module moved from `std` to `extra`.
9060 * extra: `fileinput` module for iterating over a series of files.
9061 * extra: `Complex` number type and `complex` module.
9062 * extra: `Rational` number type and `rational` module.
9063 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
9064 * extra: `term` uses terminfo now, is more correct.
9065 * extra: `arc` functions converted to methods.
9066 * extra: Implementation of fixed output size variations of SHA-2.
9069 * `unused_variables` lint mode for unused variables (default: warn).
9070 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
9072 * `unused_mut` lint mode for identifying unused `mut` qualifiers
9074 * `dead_assignment` lint mode for unread variables (default: warn).
9075 * `unnecessary_allocation` lint mode detects some heap allocations that are
9076 immediately borrowed so could be written without allocating (default: warn).
9077 * `missing_doc` lint mode (default: allow).
9078 * `unreachable_code` lint mode (default: warn).
9079 * The `rusti` command has been rewritten and a number of bugs addressed.
9080 * rustc outputs in color on more terminals.
9081 * rustc accepts a `--link-args` flag to pass arguments to the linker.
9082 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
9083 * Compiling with `-g` will make the binary record information about
9084 dynamic borrowcheck failures for debugging.
9085 * rustdoc has a nicer stylesheet.
9086 * Various improvements to rustdoc.
9087 * Improvements to rustpkg (see the detailed release notes).
9090 Version 0.6 (2013-04-03)
9091 ========================
9093 * ~2100 changes, numerous bugfixes
9096 * The self type parameter in traits is now spelled `Self`
9097 * The `self` parameter in trait and impl methods must now be explicitly
9098 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
9099 * Static methods no longer require the `static` keyword and instead
9100 are distinguished by the lack of a `self` parameter
9101 * Replaced the `Durable` trait with the `'static` lifetime
9102 * The old closure type syntax with the trailing sigil has been
9103 removed in favor of the more consistent leading sigil
9104 * `super` is a keyword, and may be prefixed to paths
9105 * Trait bounds are separated with `+` instead of whitespace
9106 * Traits are implemented with `impl Trait for Type`
9107 instead of `impl Type: Trait`
9108 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
9109 * The `export` keyword has finally been removed
9110 * The `move` keyword has been removed (see "Semantic changes")
9111 * The interior mutability qualifier on vectors, `[mut T]`, has been
9112 removed. Use `&mut [T]`, etc.
9113 * `mut` is no longer valid in `~mut T`. Use inherited mutability
9114 * `fail` is no longer a keyword. Use `fail!()`
9115 * `assert` is no longer a keyword. Use `assert!()`
9116 * `log` is no longer a keyword. use `debug!`, etc.
9117 * 1-tuples may be represented as `(T,)`
9118 * Struct fields may no longer be `mut`. Use inherited mutability,
9119 `@mut T`, `core::mut` or `core::cell`
9120 * `extern mod { ... }` is no longer valid syntax for foreign
9121 function modules. Use extern blocks: `extern { ... }`
9122 * Newtype enums removed. Use tuple-structs.
9123 * Trait implementations no longer support visibility modifiers
9124 * Pattern matching over vectors improved and expanded
9125 * `const` renamed to `static` to correspond to lifetime name,
9126 and make room for future `static mut` unsafe mutable globals.
9127 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
9128 * `Clone` implementations can be automatically generated with
9129 `#[deriving(Clone)]`
9130 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
9131 instead of `foo as Bar`.
9132 * Fixed length vector types are now written as `[int, .. 3]`
9133 instead of `[int * 3]`.
9134 * Fixed length vector types can express the length as a constant
9135 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
9138 * Types with owned pointers or custom destructors move by default,
9139 eliminating the `move` keyword
9140 * All foreign functions are considered unsafe
9141 * &mut is now unaliasable
9142 * Writes to borrowed @mut pointers are prevented dynamically
9144 * The name of the main function can be customized using #[main]
9145 * The default type of an inferred closure is &fn instead of @fn
9146 * `use` statements may no longer be "chained" - they cannot import
9147 identifiers imported by previous `use` statements
9148 * `use` statements are crate relative, importing from the "top"
9149 of the crate by default. Paths may be prefixed with `super::`
9150 or `self::` to change the search behavior.
9151 * Method visibility is inherited from the implementation declaration
9152 * Structural records have been removed
9153 * Many more types can be used in static items, including enums
9154 'static-lifetime pointers and vectors
9155 * Pattern matching over vectors improved and expanded
9156 * Typechecking of closure types has been overhauled to
9157 improve inference and eliminate unsoundness
9158 * Macros leave scope at the end of modules, unless that module is
9159 tagged with #[macro_escape]
9162 * Added big integers to `std::bigint`
9163 * Removed `core::oldcomm` module
9164 * Added pipe-based `core::comm` module
9165 * Numeric traits have been reorganized under `core::num`
9166 * `vec::slice` finally returns a slice
9167 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
9168 * Containers reorganized around traits in `core::container`
9169 * `core::dvec` removed, `~[T]` is a drop-in replacement
9170 * `core::send_map` renamed to `core::hashmap`
9171 * `std::map` removed; replaced with `core::hashmap`
9172 * `std::treemap` reimplemented as an owned balanced tree
9173 * `std::deque` and `std::smallintmap` reimplemented as owned containers
9174 * `core::trie` added as a fast ordered map for integer keys
9175 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
9176 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
9177 overload the comparison operators, whereas `TotalOrd` is used
9178 by certain container types
9181 * Replaced the 'cargo' package manager with 'rustpkg'
9182 * Added all-purpose 'rust' tool
9183 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
9184 * rustc now *attempts* to offer spelling suggestions
9185 * Improved support for ARM and Android
9186 * Preliminary MIPS backend
9187 * Improved foreign function ABI implementation for x86, x86_64
9188 * Various memory usage improvements
9189 * Rust code may be embedded in foreign code under limited circumstances
9190 * Inline assembler supported by new asm!() syntax extension.
9193 Version 0.5 (2012-12-21)
9194 ===========================
9196 * ~900 changes, numerous bugfixes
9199 * Removed `<-` move operator
9200 * Completed the transition from the `#fmt` extension syntax to `fmt!`
9201 * Removed old fixed length vector syntax - `[T]/N`
9202 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
9203 * Macros may now expand to items and statements
9204 * `a.b()` is always parsed as a method call, never as a field projection
9205 * `Eq` and `IterBytes` implementations can be automatically generated
9206 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
9207 * Removed the special crate language for `.rc` files
9208 * Function arguments may consist of any irrefutable pattern
9211 * `&` and `~` pointers may point to objects
9212 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
9213 * Enum variants may be structs
9214 * Destructors can be added to all nominal types with the Drop trait
9215 * Structs and nullary enum variants may be constants
9216 * Values that cannot be implicitly copied are now automatically moved
9217 without writing `move` explicitly
9218 * `&T` may now be coerced to `*T`
9219 * Coercions happen in `let` statements as well as function calls
9220 * `use` statements now take crate-relative paths
9221 * The module and type namespaces have been merged so that static
9222 method names can be resolved under the trait in which they are
9225 * Improved support for language features
9226 * Trait inheritance works in many scenarios
9227 * More support for explicit self arguments in methods - `self`, `&self`
9228 `@self`, and `~self` all generally work as expected
9229 * Static methods work in more situations
9230 * Experimental: Traits may declare default methods for the implementations
9234 * New condition handling system in `core::condition`
9235 * Timsort added to `std::sort`
9236 * New priority queue, `std::priority_queue`
9237 * Pipes for serializable types, `std::flatpipes'
9238 * Serialization overhauled to be trait-based
9239 * Expanded `getopts` definitions
9240 * Moved futures to `std`
9241 * More functions are pure now
9242 * `core::comm` renamed to `oldcomm`. Still deprecated
9243 * `rustdoc` and `cargo` are libraries now
9246 * Added a preliminary REPL, `rusti`
9247 * License changed from MIT to dual MIT/APL2
9250 Version 0.4 (2012-10-15)
9251 ==========================
9253 * ~2000 changes, numerous bugfixes
9256 * All keywords are now strict and may not be used as identifiers anywhere
9257 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
9258 'of', 'with', 'to', 'class'.
9259 * Classes are replaced with simpler structs
9260 * Explicit method self types
9261 * `ret` became `return` and `alt` became `match`
9262 * `import` is now `use`; `use is now `extern mod`
9263 * `extern mod { ... }` is now `extern { ... }`
9264 * `use mod` is the recommended way to import modules
9265 * `pub` and `priv` replace deprecated export lists
9266 * The syntax of `match` pattern arms now uses fat arrow (=>)
9267 * `main` no longer accepts an args vector; use `os::args` instead
9270 * Trait implementations are now coherent, ala Haskell typeclasses
9271 * Trait methods may be static
9272 * Argument modes are deprecated
9273 * Borrowed pointers are much more mature and recommended for use
9274 * Strings and vectors in the static region are stored in constant memory
9275 * Typestate was removed
9276 * Resolution rewritten to be more reliable
9277 * Support for 'dual-mode' data structures (freezing and thawing)
9280 * Most binary operators can now be overloaded via the traits in
9282 * `std::net::url` for representing URLs
9283 * Sendable hash maps in `core::send_map`
9284 * `core::task' gained a (currently unsafe) task-local storage API
9287 * An efficient new intertask communication primitive called the pipe,
9288 along with a number of higher-level channel types, in `core::pipes`
9289 * `std::arc`, an atomically reference counted, immutable, shared memory
9291 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9292 * Futures are now based on pipes and sendable
9293 * More robust linked task failure
9294 * Improved task builder API
9297 * Improved error reporting
9298 * Preliminary JIT support
9299 * Preliminary work on precise GC
9300 * Extensive architectural improvements to rustc
9301 * Begun a transition away from buggy C++-based reflection (shape) code to
9302 Rust-based (visitor) code
9303 * All hash functions and tables converted to secure, randomized SipHash
9306 Version 0.3 (2012-07-12)
9307 ========================
9309 * ~1900 changes, numerous bugfixes
9311 * New coding conveniences
9312 * Integer-literal suffix inference
9313 * Per-item control over warnings, errors
9314 * #[cfg(windows)] and #[cfg(unix)] attributes
9315 * Documentation comments
9316 * More compact closure syntax
9317 * 'do' expressions for treating higher-order functions as
9319 * *-patterns (wildcard extended to all constructor fields)
9322 * Name resolution pass and exhaustiveness checker rewritten
9323 * Region pointers and borrow checking supersede alias
9325 * Init-ness checking is now provided by a region-based liveness
9326 pass instead of the typestate pass; same for last-use analysis
9327 * Extensive work on region pointers
9329 * Experimental new language features
9330 * Slices and fixed-size, interior-allocated vectors
9331 * #!-comments for lang versioning, shell execution
9332 * Destructors and iface implementation for classes;
9333 type-parameterized classes and class methods
9334 * 'const' type kind for types that can be used to implement
9335 shared-memory concurrency patterns
9339 * Removal of various obsolete features
9340 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9341 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9343 * Constructs: do-while loops ('do' repurposed), fn binding,
9344 resources (replaced by destructors)
9346 * Compiler reorganization
9347 * Syntax-layer of compiler split into separate crate
9348 * Clang (from LLVM project) integrated into build
9349 * Typechecker split into sub-modules
9352 * New time functions
9353 * Extension methods for many built-in types
9354 * Arc: atomic-refcount read-only / exclusive-use shared cells
9355 * Par: parallel map and search routines
9356 * Extensive work on libuv interface
9357 * Much vector code moved to libraries
9358 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9359 #include, #include_str, #include_bin
9362 * Cargo automatically resolves dependencies
9365 Version 0.2 (2012-03-29)
9366 =========================
9368 * >1500 changes, numerous bugfixes
9370 * New docs and doc tooling
9372 * New port: FreeBSD x86_64
9374 * Compilation model enhancements
9375 * Generics now specialized, multiply instantiated
9376 * Functions now inlined across separate crates
9378 * Scheduling, stack and threading fixes
9379 * Noticeably improved message-passing performance
9380 * Explicit schedulers
9384 * Experimental new language features
9385 * Operator overloading
9389 * Various language extensions
9390 * C-callback function types: 'crust fn ...'
9391 * Infinite-loop construct: 'loop { ... }'
9392 * Shorten 'mutable' to 'mut'
9393 * Required mutable-local qualifier: 'let mut ...'
9394 * Basic glob-exporting: 'export foo::*;'
9395 * Alt now exhaustive, 'alt check' for runtime-checked
9396 * Block-function form of 'for' loop, with 'break' and 'ret'.
9399 * AST quasi-quote syntax extension
9400 * Revived libuv interface
9401 * New modules: core::{future, iter}, std::arena
9402 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9403 * Extensive cleanup, regularization in libstd, libcore
9406 Version 0.1 (2012-01-20)
9407 ===============================
9409 * Most language features work, including:
9410 * Unique pointers, unique closures, move semantics
9411 * Interface-constrained generics
9412 * Static interface dispatch
9414 * Multithread task scheduling
9415 * Typestate predicates
9416 * Failure unwinding, destructors
9417 * Pattern matching and destructuring assignment
9418 * Lightweight block-lambda syntax
9419 * Preliminary macro-by-example
9421 * Compiler works with the following configurations:
9422 * Linux: x86 and x86_64 hosts and targets
9423 * macOS: x86 and x86_64 hosts and targets
9424 * Windows: x86 hosts and targets
9426 * Cross compilation / multi-target configuration supported.
9428 * Preliminary API-documentation and package-management tools included.
9432 * Documentation is incomplete.
9434 * Performance is below intended target.
9436 * Standard library APIs are subject to extensive change, reorganization.
9438 * Language-level versioning is not yet operational - future code will