1 Version 1.41.0 (2020-01-30)
2 ===========================
7 - [You can now pass type parameters to foreign items when implementing
8 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
9 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
10 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
11 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
12 - [You can now use any valid identifier in a `format_args` macro.][66847]
13 Previously identifiers starting with an underscore were not allowed.
14 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
15 enum variants.][66183] These are still rejected semantically, but
16 can be seen and parsed by procedural macros and conditional compilation.
21 - [Rustc will now warn if you have unused loop `'label`s.][66325]
22 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
23 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
24 - [You can now pass an arguments file passing the `@path` syntax
25 to rustc.][66172] Note that the format differs somewhat from what is
26 found in other tooling; please see [the documentation][argfile-docs] for
28 - [You can now provide `--extern` flag without a path, indicating that it is
29 available from the search path or specified with an `-L` flag.][64882]
31 \* Refer to Rust's [platform support page][forge-platform-support] for more
32 information on Rust's tiered platform support.
34 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
39 - [The `core::panic` module is now stable.][66771] It was already stable
41 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
42 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
43 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
49 - [`Result::map_or_else`]
50 - [`std::rc::Weak::weak_count`]
51 - [`std::rc::Weak::strong_count`]
52 - [`std::sync::Weak::weak_count`]
53 - [`std::sync::Weak::strong_count`]
58 - [Cargo will now document all the private items for binary crates
59 by default.][cargo/7593]
60 - [`cargo-install` will now reinstall the package if it detects that it is out
62 - [Cargo.lock now uses a more git friendly format that should help to reduce
63 merge conflicts.][cargo/7579]
64 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
65 `[profile.dev.overrides.image] opt-level = 2` sets the `image` crate's
66 optimisation level to `2` for debug builds. You can also use
67 `[profile.<profile>.build_overrides]` to override build scripts and
73 - [You can now specify `edition` in documentation code blocks to compile the block
74 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
75 should be compiled the 2018 edition of Rust.
76 - [You can now provide custom themes to rustdoc with `--theme`, and check the
77 current theme with `--check-theme`.][54733]
78 - [You can use `#[doc(cfg(item))]` to document that a item is only available with
79 certain features.][61351]
84 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
85 Apple targets.][apple-32bit-drop] This means that the source code is still
86 available to build, but the targets are no longer being tested and release
87 binaries for those platforms will no longer be distributed by the Rust project.
88 Please refer to the linked blog post for more information.
90 [54733]: https://github.com/rust-lang/rust/pull/54733/
91 [61351]: https://github.com/rust-lang/rust/pull/61351/
92 [67255]: https://github.com/rust-lang/rust/pull/67255/
93 [66661]: https://github.com/rust-lang/rust/pull/66661/
94 [66771]: https://github.com/rust-lang/rust/pull/66771/
95 [66847]: https://github.com/rust-lang/rust/pull/66847/
96 [66238]: https://github.com/rust-lang/rust/pull/66238/
97 [66277]: https://github.com/rust-lang/rust/pull/66277/
98 [66325]: https://github.com/rust-lang/rust/pull/66325/
99 [66172]: https://github.com/rust-lang/rust/pull/66172/
100 [66183]: https://github.com/rust-lang/rust/pull/66183/
101 [65879]: https://github.com/rust-lang/rust/pull/65879/
102 [65013]: https://github.com/rust-lang/rust/pull/65013/
103 [64882]: https://github.com/rust-lang/rust/pull/64882/
104 [64325]: https://github.com/rust-lang/rust/pull/64325/
105 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
106 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
107 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
108 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
109 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
110 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
111 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
112 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
113 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
114 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
115 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
117 Version 1.40.0 (2019-12-19)
118 ===========================
122 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
123 `const` contexts.][65188] e.g.
126 pub struct Point(i32, i32);
128 const ORIGIN: Point = {
129 let constructor = Point;
135 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
136 indicate that there may be variants or fields added in the future.][64639]
137 For example this requires adding a wild-card branch (`_ => {}`) to any match
138 statements on a non-exhaustive `enum`. [(RFC 2008)]
139 - [You can now use function-like procedural macros in `extern` blocks and in
140 type positions.][63931] e.g. `type Generated = macro!();`
141 - [Function-like and attribute procedural macros can now emit
142 `macro_rules!` items, so you can now have your macros generate macros.][64035]
143 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
144 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
145 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
149 - [Added tier 3 support\* for the
150 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
151 - [Added tier 3 support for the
152 `aarch64-unknown-none-softfloat` target.][64589]
153 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
154 `mips64el-unknown-linux-muslabi64` targets.][65843]
156 \* Refer to Rust's [platform support page][forge-platform-support] for more
157 information on Rust's tiered platform support.
161 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
165 - [`BTreeMap::get_key_value`]
166 - [`HashMap::get_key_value`]
167 - [`Option::as_deref_mut`]
168 - [`Option::as_deref`]
169 - [`Option::flatten`]
170 - [`UdpSocket::peer_addr`]
171 - [`f32::to_be_bytes`]
172 - [`f32::to_le_bytes`]
173 - [`f32::to_ne_bytes`]
174 - [`f64::to_be_bytes`]
175 - [`f64::to_le_bytes`]
176 - [`f64::to_ne_bytes`]
177 - [`f32::from_be_bytes`]
178 - [`f32::from_le_bytes`]
179 - [`f32::from_ne_bytes`]
180 - [`f64::from_be_bytes`]
181 - [`f64::from_le_bytes`]
182 - [`f64::from_ne_bytes`]
189 - [Cargo will now always display warnings, rather than only on
190 fresh builds.][cargo/7450]
191 - [Feature flags (except `--all-features`) passed to a virtual workspace will
192 now produce an error.][cargo/7507] Previously these flags were ignored.
193 - [You can now publish `dev-dependencies` without including
194 a `version`.][cargo/7333]
198 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
199 when running documentation tests with `rustdoc`.][63803]
203 - [As previously announced, any previous NLL warnings in the 2015 edition are
204 now hard errors.][64221]
205 - [The `include!` macro will now warn if it failed to include the
206 entire file.][64284] The `include!` macro unintentionally only includes the
207 first _expression_ in a file, and this can be unintuitive. This will become
208 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
209 - [Using `#[inline]` on function prototypes and consts now emits a warning under
210 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
211 or `extern` blocks now correctly emits a hard error.
213 [65294]: https://github.com/rust-lang/rust/pull/65294/
214 [66103]: https://github.com/rust-lang/rust/pull/66103/
215 [65843]: https://github.com/rust-lang/rust/pull/65843/
216 [65188]: https://github.com/rust-lang/rust/pull/65188/
217 [65092]: https://github.com/rust-lang/rust/pull/65092/
218 [64589]: https://github.com/rust-lang/rust/pull/64589/
219 [64639]: https://github.com/rust-lang/rust/pull/64639/
220 [64221]: https://github.com/rust-lang/rust/pull/64221/
221 [64284]: https://github.com/rust-lang/rust/pull/64284/
222 [63931]: https://github.com/rust-lang/rust/pull/63931/
223 [64035]: https://github.com/rust-lang/rust/pull/64035/
224 [63674]: https://github.com/rust-lang/rust/pull/63674/
225 [63803]: https://github.com/rust-lang/rust/pull/63803/
226 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
227 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
228 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
229 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
230 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
231 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
232 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
233 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
234 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
235 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
236 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
237 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
238 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
239 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
240 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
241 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
242 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
243 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
244 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
245 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
246 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
247 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
248 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
249 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
250 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
251 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
254 Version 1.39.0 (2019-11-07)
255 ===========================
259 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
260 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
261 - [You can now use certain attributes on function, closure, and function pointer
262 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
263 `deny`, `forbid` as well as inert helper attributes used by procedural macro
264 attributes applied to items. e.g.
267 #[cfg(windows)] slice: &[u16],
268 #[cfg(not(windows))] slice: &[u8],
273 - [You can now take shared references to bind-by-move patterns in the `if` guards
274 of `match` arms.][63118] e.g.
277 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
281 // ---- `nums` is bound by move.
282 if nums.iter().sum::<u8>() == 10
283 // ^------ `.iter()` implicitly takes a reference to `nums`.
286 // ----------- Legal as `nums` was bound by move and so we have ownership.
297 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
298 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
299 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
300 **Note** Cargo currently doesn't use this feature. Refer to
301 [cargo#7315][cargo/7315] to track this feature's progress.
302 - [You can now pass `--show-output` argument to test binaries to print the
303 output of successful tests.][62600]
306 \* Refer to Rust's [platform support page][forge-platform-support] for more
307 information on Rust's tiered platform support.
311 - [`Vec::new` and `String::new` are now `const` functions.][64028]
312 - [`LinkedList::new` is now a `const` function.][63684]
313 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
314 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
319 - [`Pin::into_inner`]
320 - [`Instant::checked_duration_since`]
321 - [`Instant::saturating_duration_since`]
325 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
326 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
327 `--all` is now deprecated.
331 - [You can now pass `-Clinker` to rustdoc to control the linker used
332 for compiling doctests.][63834]
336 - [Code that was previously accepted by the old borrow checker, but rejected by
337 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
338 previously a warning, and will also become a hard error in the Rust 2015
339 edition in the 1.40.0 release.
340 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
341 run tests.][63827] This should improve performance when running a large
343 - [The `try!` macro will now issue a deprecation warning.][62672] It is
344 recommended to use the `?` operator instead.
345 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
348 [62600]: https://github.com/rust-lang/rust/pull/62600/
349 [62672]: https://github.com/rust-lang/rust/pull/62672/
350 [63118]: https://github.com/rust-lang/rust/pull/63118/
351 [63209]: https://github.com/rust-lang/rust/pull/63209/
352 [63402]: https://github.com/rust-lang/rust/pull/63402/
353 [63565]: https://github.com/rust-lang/rust/pull/63565/
354 [63595]: https://github.com/rust-lang/rust/pull/63595/
355 [63684]: https://github.com/rust-lang/rust/pull/63684/
356 [63698]: https://github.com/rust-lang/rust/pull/63698/
357 [63770]: https://github.com/rust-lang/rust/pull/63770/
358 [63786]: https://github.com/rust-lang/rust/pull/63786/
359 [63827]: https://github.com/rust-lang/rust/pull/63827/
360 [63834]: https://github.com/rust-lang/rust/pull/63834/
361 [63927]: https://github.com/rust-lang/rust/pull/63927/
362 [63933]: https://github.com/rust-lang/rust/pull/63933/
363 [63934]: https://github.com/rust-lang/rust/pull/63934/
364 [63938]: https://github.com/rust-lang/rust/pull/63938/
365 [63940]: https://github.com/rust-lang/rust/pull/63940/
366 [63941]: https://github.com/rust-lang/rust/pull/63941/
367 [63945]: https://github.com/rust-lang/rust/pull/63945/
368 [64010]: https://github.com/rust-lang/rust/pull/64010/
369 [64028]: https://github.com/rust-lang/rust/pull/64028/
370 [64334]: https://github.com/rust-lang/rust/pull/64334/
371 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
372 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
373 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
374 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
375 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
376 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
378 Version 1.38.0 (2019-09-26)
379 ==========================
383 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
384 - [The `#[deprecated]` attribute can now be used on macros.][62042]
388 - [Added pipelined compilation support to `rustc`.][62766] This will
389 improve compilation times in some cases. For further information please refer
390 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
391 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
392 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
393 `x86_64-uwp-windows-msvc` targets.][60260]
394 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
395 `armv7-unknown-linux-musleabi` targets.][63107]
396 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
397 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
399 \* Refer to Rust's [platform support page][forge-platform-support] for more
400 information on Rust's tiered platform support.
404 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
405 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
406 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
407 is available at `std::clone::Clone`). This also makes all built-in macros
408 available in `std`/`core` root. e.g. `std::include_bytes!`.
409 - [`str::Chars` now implements `Debug`.][63000]
410 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
411 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
412 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
413 - [Added euclidean remainder and division operations (`div_euclid`,
414 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
415 `overflowing`, and `wrapping` versions are available for all
417 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
419 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
423 - [`<*const T>::cast`]
425 - [`Duration::as_secs_f32`]
426 - [`Duration::as_secs_f64`]
427 - [`Duration::div_f32`]
428 - [`Duration::div_f64`]
429 - [`Duration::from_secs_f32`]
430 - [`Duration::from_secs_f64`]
431 - [`Duration::mul_f32`]
432 - [`Duration::mul_f64`]
437 - [Added pipelined compilation support to `cargo`.][cargo/7143]
438 - [You can now pass the `--features` option multiple times to enable
439 multiple features.][cargo/7084]
443 - [`rustc` will now warn about some incorrect uses of
444 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
448 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
450 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
451 issues][62896] with certain crates such as libc.
453 [60260]: https://github.com/rust-lang/rust/pull/60260/
454 [61457]: https://github.com/rust-lang/rust/pull/61457/
455 [61491]: https://github.com/rust-lang/rust/pull/61491/
456 [61884]: https://github.com/rust-lang/rust/pull/61884/
457 [61953]: https://github.com/rust-lang/rust/pull/61953/
458 [62042]: https://github.com/rust-lang/rust/pull/62042/
459 [62528]: https://github.com/rust-lang/rust/pull/62528/
460 [62583]: https://github.com/rust-lang/rust/pull/62583/
461 [62735]: https://github.com/rust-lang/rust/pull/62735/
462 [62766]: https://github.com/rust-lang/rust/pull/62766/
463 [62784]: https://github.com/rust-lang/rust/pull/62784/
464 [62785]: https://github.com/rust-lang/rust/issues/62785/
465 [62814]: https://github.com/rust-lang/rust/pull/62814/
466 [62896]: https://github.com/rust-lang/rust/issues/62896/
467 [63000]: https://github.com/rust-lang/rust/pull/63000/
468 [63056]: https://github.com/rust-lang/rust/pull/63056/
469 [63107]: https://github.com/rust-lang/rust/pull/63107/
470 [63346]: https://github.com/rust-lang/rust/pull/63346/
471 [63421]: https://github.com/rust-lang/rust/pull/63421/
472 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
473 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
474 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
475 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
476 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
477 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
478 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
479 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
480 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
481 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
482 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
483 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
484 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
485 [forge-platform-support]: https://forge.rust-lang.org/platform-support.html
486 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
488 Version 1.37.0 (2019-08-15)
489 ==========================
493 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
494 [`Box`][62228], or an [array][62235] and unused.
495 - [You can now use the `cfg` and `cfg_attr` attributes on
496 generic parameters.][61547]
497 - [You can now use enum variants through type alias.][61682] e.g. You can
500 type MyOption = Option<u8>;
502 fn increment_or_zero(x: MyOption) -> u8 {
504 MyOption::Some(y) => y + 1,
509 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
511 - [You can now use `#[repr(align(X)]` on enums.][61229]
512 - [The `?` Kleene macro operator is now available in the
513 2015 edition.][60932]
517 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
518 and `-C profile-use` flags.][61268] For more information on how to use profile
519 guided optimization, please refer to the [rustc book][rustc-book-pgo].
520 - [The `rust-lldb` wrapper script should now work again.][61827]
524 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
528 - [`BufReader::buffer`]
529 - [`BufWriter::buffer`]
531 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
532 - [`DoubleEndedIterator::nth_back`]
534 - [`Wrapping::reverse_bits`]
535 - [`i128::reverse_bits`]
536 - [`i16::reverse_bits`]
537 - [`i32::reverse_bits`]
538 - [`i64::reverse_bits`]
539 - [`i8::reverse_bits`]
540 - [`isize::reverse_bits`]
541 - [`slice::copy_within`]
542 - [`u128::reverse_bits`]
543 - [`u16::reverse_bits`]
544 - [`u32::reverse_bits`]
545 - [`u64::reverse_bits`]
546 - [`u8::reverse_bits`]
547 - [`usize::reverse_bits`]
551 - [`Cargo.lock` files are now included by default when publishing executable crates
552 with executables.][cargo/7026]
553 - [You can now specify `default-run="foo"` in `[package]` to specify the
554 default executable to use for `cargo run`.][cargo/7056]
561 - [Using `...` for inclusive range patterns will now warn by default.][61342]
562 Please transition your code to using the `..=` syntax for inclusive
564 - [Using a trait object without the `dyn` will now warn by default.][61203]
565 Please transition your code to use `dyn Trait` for trait objects instead.
567 [62228]: https://github.com/rust-lang/rust/pull/62228/
568 [62235]: https://github.com/rust-lang/rust/pull/62235/
569 [61802]: https://github.com/rust-lang/rust/pull/61802/
570 [61827]: https://github.com/rust-lang/rust/pull/61827/
571 [61547]: https://github.com/rust-lang/rust/pull/61547/
572 [61682]: https://github.com/rust-lang/rust/pull/61682/
573 [61268]: https://github.com/rust-lang/rust/pull/61268/
574 [61342]: https://github.com/rust-lang/rust/pull/61342/
575 [61347]: https://github.com/rust-lang/rust/pull/61347/
576 [61100]: https://github.com/rust-lang/rust/pull/61100/
577 [61203]: https://github.com/rust-lang/rust/pull/61203/
578 [61229]: https://github.com/rust-lang/rust/pull/61229/
579 [60932]: https://github.com/rust-lang/rust/pull/60932/
580 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
581 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
582 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
583 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
584 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
585 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
586 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
587 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
588 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
589 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
590 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
591 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
592 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
593 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
594 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
595 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
596 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
597 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
598 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
599 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
600 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
601 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
602 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
603 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
606 Version 1.36.0 (2019-07-04)
607 ==========================
611 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
612 - [The order of traits in trait objects no longer affects the semantics of that
613 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
614 `dyn fmt::Debug + Send`, where this was previously not the case.
618 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
619 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
620 - [`mem::needs_drop` is now available as a const fn.][60364]
621 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
622 - [`String` now implements `BorrowMut<str>`.][60404]
623 - [`io::Cursor` now implements `Default`.][60234]
624 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
625 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
626 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
627 environment has access to heap memory allocation.
628 - [`String` now implements `From<&String>`.][59825]
629 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
630 return a tuple of each argument when there is multiple arguments.
631 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
636 - [`VecDeque::rotate_left`]
637 - [`VecDeque::rotate_right`]
638 - [`Iterator::copied`]
641 - [`Read::read_vectored`]
642 - [`Write::write_vectored`]
643 - [`str::as_mut_ptr`]
644 - [`mem::MaybeUninit`]
645 - [`pointer::align_offset`]
649 - [`task::RawWakerVTable`]
655 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
656 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
658 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
662 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
669 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
670 longer recommended, and will be deprecated in 1.39.0.
672 [60318]: https://github.com/rust-lang/rust/pull/60318/
673 [60364]: https://github.com/rust-lang/rust/pull/60364/
674 [60370]: https://github.com/rust-lang/rust/pull/60370/
675 [60404]: https://github.com/rust-lang/rust/pull/60404/
676 [60234]: https://github.com/rust-lang/rust/pull/60234/
677 [60244]: https://github.com/rust-lang/rust/pull/60244/
678 [58623]: https://github.com/rust-lang/rust/pull/58623/
679 [59648]: https://github.com/rust-lang/rust/pull/59648/
680 [59675]: https://github.com/rust-lang/rust/pull/59675/
681 [59825]: https://github.com/rust-lang/rust/pull/59825/
682 [59826]: https://github.com/rust-lang/rust/pull/59826/
683 [59445]: https://github.com/rust-lang/rust/pull/59445/
684 [59114]: https://github.com/rust-lang/rust/pull/59114/
685 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
686 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
687 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
688 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
689 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
690 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
691 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
692 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
693 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
694 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
695 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
696 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
697 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
698 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
699 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
700 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
701 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
702 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
703 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
704 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
707 Version 1.35.0 (2019-05-23)
708 ==========================
712 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
713 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
714 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
716 unsafe fn call_unsafe(func: unsafe fn()) {
721 unsafe { call_unsafe(|| {}); }
728 - [Added the `armv6-unknown-freebsd-gnueabihf` and
729 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
730 - [Added the `wasm32-unknown-wasi` target.][59464]
735 - [`Thread` will now show its ID in `Debug` output.][59460]
736 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
737 - [`alloc::System` now implements `Default`.][59451]
738 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
740 - [`char::{ToLowercase, ToUppercase}` now
741 implement `ExactSizeIterator`.][58778]
742 - [All `NonZero` numeric types now implement `FromStr`.][58717]
743 - [Removed the `Read` trait bounds
744 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
745 - [You can now call the `dbg!` macro without any parameters to print the file
746 and line where it is called.][57847]
747 - [In place ASCII case conversions are now up to 4× faster.][59283]
748 e.g. `str::make_ascii_lowercase`
749 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
756 - [`RefCell::replace_with`]
757 - [`RefCell::map_split`]
759 - [`Range::contains`]
760 - [`RangeFrom::contains`]
761 - [`RangeTo::contains`]
762 - [`RangeInclusive::contains`]
763 - [`RangeToInclusive::contains`]
768 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
769 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
774 - [The Rust toolchain is now available natively for musl based distros.][58575]
776 [59460]: https://github.com/rust-lang/rust/pull/59460/
777 [59464]: https://github.com/rust-lang/rust/pull/59464/
778 [59500]: https://github.com/rust-lang/rust/pull/59500/
779 [59512]: https://github.com/rust-lang/rust/pull/59512/
780 [59580]: https://github.com/rust-lang/rust/pull/59580/
781 [59283]: https://github.com/rust-lang/rust/pull/59283/
782 [59451]: https://github.com/rust-lang/rust/pull/59451/
783 [59076]: https://github.com/rust-lang/rust/pull/59076/
784 [58778]: https://github.com/rust-lang/rust/pull/58778/
785 [58717]: https://github.com/rust-lang/rust/pull/58717/
786 [58369]: https://github.com/rust-lang/rust/pull/58369/
787 [58423]: https://github.com/rust-lang/rust/pull/58423/
788 [58080]: https://github.com/rust-lang/rust/pull/58080/
789 [57847]: https://github.com/rust-lang/rust/pull/57847/
790 [58575]: https://github.com/rust-lang/rust/pull/58575
791 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
792 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
793 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
794 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
795 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
796 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
797 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
798 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
799 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
800 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
801 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
802 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
804 Version 1.34.2 (2019-05-14)
805 ===========================
807 * [Destabilize the `Error::type_id` function due to a security
808 vulnerability][60785] ([CVE-2019-12083])
810 [60785]: https://github.com/rust-lang/rust/pull/60785
811 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
813 Version 1.34.1 (2019-04-25)
814 ===========================
816 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
817 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
818 * [Fix Clippy panic when checking some macros][clippy/3805]
820 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
821 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
822 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
824 Version 1.34.0 (2019-04-11)
825 ==========================
829 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
830 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
832 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
833 `#[attr{}]` procedural macros.][57367]
834 - [You can now write `extern crate self as foo;`][57407] to import your
835 crate's root into the extern prelude.
840 - [You can now target `riscv64imac-unknown-none-elf` and
841 `riscv64gc-unknown-none-elf`.][58406]
842 - [You can now enable linker plugin LTO optimisations with
843 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
844 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
846 - [You can now target `powerpc64-unknown-freebsd`.][57809]
851 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
852 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
853 the `Hash` trait to create an iterator.
854 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
855 methods.][58421] Most notably you no longer require the `Ord` trait to create
857 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
858 for all numeric types.][58044]
859 - [Indexing a `str` is now generic over all types that
860 implement `SliceIndex<str>`.][57604]
861 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
862 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
863 produce a warning if their returning type is unused.
864 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
865 `overflowing_pow` are now available for all numeric types.][57873] These are
866 equivalent to methods such as `wrapping_add` for the `pow` operation.
875 * [`atomic::AtomicI16`]
876 * [`atomic::AtomicI32`]
877 * [`atomic::AtomicI64`]
878 * [`atomic::AtomicI8`]
879 * [`atomic::AtomicU16`]
880 * [`atomic::AtomicU32`]
881 * [`atomic::AtomicU64`]
882 * [`atomic::AtomicU8`]
883 * [`convert::Infallible`]
884 * [`convert::TryFrom`]
885 * [`convert::TryInto`]
887 * [`iter::successors`]
888 * [`num::NonZeroI128`]
889 * [`num::NonZeroI16`]
890 * [`num::NonZeroI32`]
891 * [`num::NonZeroI64`]
893 * [`num::NonZeroIsize`]
894 * [`slice::sort_by_cached_key`]
895 * [`str::escape_debug`]
896 * [`str::escape_default`]
897 * [`str::escape_unicode`]
898 * [`str::split_ascii_whitespace`]
901 * [`Instant::checked_add`]
902 * [`Instant::checked_sub`]
903 * [`SystemTime::checked_add`]
904 * [`SystemTime::checked_sub`]
908 - [You can now use alternative registries to crates.io.][cargo/6654]
912 - [You can now use the `?` operator in your documentation tests without manually
913 adding `fn main() -> Result<(), _> {}`.][56470]
917 - [`Command::before_exec` is being replaced by the unsafe method
918 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
919 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
920 can now use `const` functions in `static` variables.
922 [58370]: https://github.com/rust-lang/rust/pull/58370/
923 [58406]: https://github.com/rust-lang/rust/pull/58406/
924 [58421]: https://github.com/rust-lang/rust/pull/58421/
925 [58166]: https://github.com/rust-lang/rust/pull/58166/
926 [58044]: https://github.com/rust-lang/rust/pull/58044/
927 [58057]: https://github.com/rust-lang/rust/pull/58057/
928 [58059]: https://github.com/rust-lang/rust/pull/58059/
929 [57809]: https://github.com/rust-lang/rust/pull/57809/
930 [57873]: https://github.com/rust-lang/rust/pull/57873/
931 [57604]: https://github.com/rust-lang/rust/pull/57604/
932 [57367]: https://github.com/rust-lang/rust/pull/57367/
933 [57407]: https://github.com/rust-lang/rust/pull/57407/
934 [57425]: https://github.com/rust-lang/rust/pull/57425/
935 [57106]: https://github.com/rust-lang/rust/pull/57106/
936 [56470]: https://github.com/rust-lang/rust/pull/56470/
937 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
938 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
939 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
940 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
941 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
942 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
943 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
944 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
945 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
946 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
947 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
948 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
949 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
950 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
951 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
952 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
953 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
954 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
955 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
956 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
957 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
958 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
959 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
960 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
961 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
962 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
963 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
964 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
965 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
966 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
967 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
970 Version 1.33.0 (2019-02-28)
971 ==========================
975 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
976 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
977 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
978 E.g. You can have match statement on a `u8` that covers `0..=255` and
979 you would no longer be required to have a `_ => unreachable!()` case.
980 - [You can now have multiple patterns in `if let` and `while let`
981 expressions.][57532] You can do this with the same syntax as a `match`
991 let state = Creature::Crab("Ferris");
993 if let Creature::Crab(name) | Creature::Person(name) = state {
994 println!("This creature's name is: {}", name);
998 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
999 this feature will by default produce a warning as this behaviour can be
1000 unintuitive. E.g. `if let _ = 5 {}`
1001 - [You can now use `let` bindings, assignments, expression statements,
1002 and irrefutable pattern destructuring in const functions.][57175]
1003 - [You can now call unsafe const functions.][57067] E.g.
1005 const unsafe fn foo() -> i32 { 5 }
1006 const fn bar() -> i32 {
1010 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1011 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1012 - [You can now specify a specific alignment with the `#[repr(packed)]`
1013 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1014 with an alignment of 2 bytes and a size of 6 bytes.
1015 - [You can now import an item from a module as an `_`.][56303] This allows you to
1016 import a trait's impls, and not have the name in the namespace. E.g.
1018 use std::io::Read as _;
1020 // Allowed as there is only one `Read` in the module.
1023 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1027 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1028 command line argument.][56351]
1029 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1030 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1031 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1032 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1033 information on Rust's platform support.
1034 - [Added support for the `thumbv7neon-linux-androideabi` and
1035 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1036 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1040 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1041 functions for all numeric types.][57566]
1042 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1043 are now `const` functions for all numeric types.][57105]
1044 - [The methods `is_positive` and `is_negative` are now `const` functions for
1045 all signed numeric types.][57105]
1046 - [The `get` method for all `NonZero` types is now `const`.][57167]
1047 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1048 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1049 numeric types.][57234]
1050 - [`Ipv4Addr::new` is now a `const` function][57234]
1054 - [`unix::FileExt::read_exact_at`]
1055 - [`unix::FileExt::write_all_at`]
1056 - [`Option::transpose`]
1057 - [`Result::transpose`]
1058 - [`convert::identity`]
1061 - [`marker::PhantomPinned`]
1062 - [`Vec::resize_with`]
1063 - [`VecDeque::resize_with`]
1064 - [`Duration::as_millis`]
1065 - [`Duration::as_micros`]
1066 - [`Duration::as_nanos`]
1071 - [You can now publish crates that require a feature flag to compile with
1072 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1073 - [Cargo should now rebuild a crate if a file was modified during the initial
1078 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1079 are now deprecated in the standard library, and their usage will now produce a warning.
1080 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1082 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1084 - [Libtest no longer creates a new thread for each test when
1085 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1087 [55982]: https://github.com/rust-lang/rust/pull/55982/
1088 [56243]: https://github.com/rust-lang/rust/pull/56243
1089 [56303]: https://github.com/rust-lang/rust/pull/56303/
1090 [56351]: https://github.com/rust-lang/rust/pull/56351/
1091 [56362]: https://github.com/rust-lang/rust/pull/56362
1092 [56642]: https://github.com/rust-lang/rust/pull/56642/
1093 [56769]: https://github.com/rust-lang/rust/pull/56769/
1094 [56805]: https://github.com/rust-lang/rust/pull/56805
1095 [56947]: https://github.com/rust-lang/rust/pull/56947/
1096 [57049]: https://github.com/rust-lang/rust/pull/57049/
1097 [57067]: https://github.com/rust-lang/rust/pull/57067/
1098 [57105]: https://github.com/rust-lang/rust/pull/57105
1099 [57130]: https://github.com/rust-lang/rust/pull/57130/
1100 [57167]: https://github.com/rust-lang/rust/pull/57167/
1101 [57175]: https://github.com/rust-lang/rust/pull/57175/
1102 [57234]: https://github.com/rust-lang/rust/pull/57234/
1103 [57332]: https://github.com/rust-lang/rust/pull/57332/
1104 [57465]: https://github.com/rust-lang/rust/pull/57465/
1105 [57532]: https://github.com/rust-lang/rust/pull/57532/
1106 [57535]: https://github.com/rust-lang/rust/pull/57535/
1107 [57566]: https://github.com/rust-lang/rust/pull/57566/
1108 [57615]: https://github.com/rust-lang/rust/pull/57615/
1109 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1110 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1111 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1112 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1113 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1114 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1115 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1116 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1117 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1118 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1119 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1120 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1121 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1122 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1123 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1124 [platform-support]: https://forge.rust-lang.org/platform-support.html
1126 Version 1.32.0 (2019-01-17)
1127 ==========================
1132 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1133 operator allows you to specify zero or one repetitions similar to the `*` and
1135 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1136 now always resolve to the item (`enum`, `struct`, etc.) available in the
1137 module if present, before resolving to a external crate or an item the prelude.][56759]
1140 enum Color { Red, Green, Blue }
1146 - [You can now match against `PhantomData<T>` types.][55837]
1147 - [You can now match against literals in macros with the `literal`
1148 specifier.][56072] This will match against a literal of any type.
1149 E.g. `1`, `'A'`, `"Hello World"`
1150 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1152 struct Point(i32, i32);
1155 pub fn new(x: i32, y: i32) -> Self {
1159 pub fn is_origin(&self) -> bool {
1167 - [Self can also now be used in type definitions.][56366] E.g.
1171 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1174 Cons(T, Box<Self>) // likewise here
1177 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1178 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1182 - [The default allocator has changed from jemalloc to the default allocator on
1183 your system.][55238] The compiler itself on Linux & macOS will still use
1184 jemalloc, but programs compiled with it will use the system allocator.
1185 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1189 - [`PathBuf` now implements `FromStr`.][55148]
1190 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1191 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1192 easily debug expressions in your rust program. E.g.
1195 let b = dbg!(a * 2) + 1;
1196 // ^-- prints: [src/main.rs:4] a * 2 = 4
1200 The following APIs are now `const` functions and can be used in a
1204 - [`UnsafeCell::get`]
1205 - [`char::is_ascii`]
1207 - [`ManuallyDrop::new`]
1208 - [`ManuallyDrop::into_inner`]
1209 - [`RangeInclusive::start`]
1210 - [`RangeInclusive::end`]
1211 - [`NonNull::as_ptr`]
1214 - [`Duration::as_secs`]
1215 - [`Duration::subsec_millis`]
1216 - [`Duration::subsec_micros`]
1217 - [`Duration::subsec_nanos`]
1219 - [`Ipv4Addr::is_unspecified`]
1221 - [`Ipv6Addr::octets`]
1225 - [`i8::to_be_bytes`]
1226 - [`i8::to_le_bytes`]
1227 - [`i8::to_ne_bytes`]
1228 - [`i8::from_be_bytes`]
1229 - [`i8::from_le_bytes`]
1230 - [`i8::from_ne_bytes`]
1231 - [`i16::to_be_bytes`]
1232 - [`i16::to_le_bytes`]
1233 - [`i16::to_ne_bytes`]
1234 - [`i16::from_be_bytes`]
1235 - [`i16::from_le_bytes`]
1236 - [`i16::from_ne_bytes`]
1237 - [`i32::to_be_bytes`]
1238 - [`i32::to_le_bytes`]
1239 - [`i32::to_ne_bytes`]
1240 - [`i32::from_be_bytes`]
1241 - [`i32::from_le_bytes`]
1242 - [`i32::from_ne_bytes`]
1243 - [`i64::to_be_bytes`]
1244 - [`i64::to_le_bytes`]
1245 - [`i64::to_ne_bytes`]
1246 - [`i64::from_be_bytes`]
1247 - [`i64::from_le_bytes`]
1248 - [`i64::from_ne_bytes`]
1249 - [`i128::to_be_bytes`]
1250 - [`i128::to_le_bytes`]
1251 - [`i128::to_ne_bytes`]
1252 - [`i128::from_be_bytes`]
1253 - [`i128::from_le_bytes`]
1254 - [`i128::from_ne_bytes`]
1255 - [`isize::to_be_bytes`]
1256 - [`isize::to_le_bytes`]
1257 - [`isize::to_ne_bytes`]
1258 - [`isize::from_be_bytes`]
1259 - [`isize::from_le_bytes`]
1260 - [`isize::from_ne_bytes`]
1261 - [`u8::to_be_bytes`]
1262 - [`u8::to_le_bytes`]
1263 - [`u8::to_ne_bytes`]
1264 - [`u8::from_be_bytes`]
1265 - [`u8::from_le_bytes`]
1266 - [`u8::from_ne_bytes`]
1267 - [`u16::to_be_bytes`]
1268 - [`u16::to_le_bytes`]
1269 - [`u16::to_ne_bytes`]
1270 - [`u16::from_be_bytes`]
1271 - [`u16::from_le_bytes`]
1272 - [`u16::from_ne_bytes`]
1273 - [`u32::to_be_bytes`]
1274 - [`u32::to_le_bytes`]
1275 - [`u32::to_ne_bytes`]
1276 - [`u32::from_be_bytes`]
1277 - [`u32::from_le_bytes`]
1278 - [`u32::from_ne_bytes`]
1279 - [`u64::to_be_bytes`]
1280 - [`u64::to_le_bytes`]
1281 - [`u64::to_ne_bytes`]
1282 - [`u64::from_be_bytes`]
1283 - [`u64::from_le_bytes`]
1284 - [`u64::from_ne_bytes`]
1285 - [`u128::to_be_bytes`]
1286 - [`u128::to_le_bytes`]
1287 - [`u128::to_ne_bytes`]
1288 - [`u128::from_be_bytes`]
1289 - [`u128::from_le_bytes`]
1290 - [`u128::from_ne_bytes`]
1291 - [`usize::to_be_bytes`]
1292 - [`usize::to_le_bytes`]
1293 - [`usize::to_ne_bytes`]
1294 - [`usize::from_be_bytes`]
1295 - [`usize::from_le_bytes`]
1296 - [`usize::from_ne_bytes`]
1300 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1301 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1305 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1309 - [The argument types for AVX's
1310 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1311 been changed from `*const` to `*mut` as the previous implementation
1315 [55148]: https://github.com/rust-lang/rust/pull/55148/
1316 [55238]: https://github.com/rust-lang/rust/pull/55238/
1317 [55280]: https://github.com/rust-lang/rust/pull/55280/
1318 [55610]: https://github.com/rust-lang/rust/pull/55610/
1319 [55663]: https://github.com/rust-lang/rust/pull/55663/
1320 [55702]: https://github.com/rust-lang/rust/pull/55702/
1321 [55837]: https://github.com/rust-lang/rust/pull/55837/
1322 [55843]: https://github.com/rust-lang/rust/pull/55843/
1323 [56072]: https://github.com/rust-lang/rust/pull/56072/
1324 [56245]: https://github.com/rust-lang/rust/pull/56245/
1325 [56365]: https://github.com/rust-lang/rust/pull/56365/
1326 [56366]: https://github.com/rust-lang/rust/pull/56366/
1327 [56395]: https://github.com/rust-lang/rust/pull/56395/
1328 [56759]: https://github.com/rust-lang/rust/pull/56759/
1329 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1330 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1331 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1332 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1333 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1334 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1335 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1336 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1337 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1338 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1339 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1340 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1341 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1342 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1343 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1344 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1345 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1346 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1347 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1348 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1349 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1350 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1351 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1352 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1353 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1354 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1355 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1356 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1357 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1358 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1359 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1360 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1361 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1362 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1363 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1364 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1365 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1366 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1367 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1368 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1369 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1370 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1371 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1372 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1373 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1374 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1375 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1376 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1377 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1378 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1379 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1380 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1381 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1382 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1383 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1384 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1385 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1386 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1387 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1388 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1389 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1390 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1391 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1392 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1393 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1394 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1395 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1396 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1397 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1398 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1399 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1400 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1401 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1402 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1403 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1404 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1405 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1406 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
1407 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
1408 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
1409 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
1410 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
1411 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
1412 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
1413 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
1414 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
1415 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
1416 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
1417 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
1418 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
1419 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
1420 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
1421 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
1424 Version 1.31.1 (2018-12-20)
1425 ===========================
1427 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
1428 - [Fix broken go-to-definition in RLS][rls/1171]
1429 - [Fix infinite loop on hover in RLS][rls/1170]
1431 [56562]: https://github.com/rust-lang/rust/pull/56562
1432 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
1433 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
1435 Version 1.31.0 (2018-12-06)
1436 ==========================
1440 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
1441 - [New lifetime elision rules now allow for eliding lifetimes in functions and
1442 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
1443 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
1445 - [You can now define and use `const` functions.][54835] These are currently
1446 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
1447 [language reference][const-reference] for what exactly is available.
1448 - [You can now use tool lints, which allow you to scope lints from external
1449 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
1450 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
1451 a crate, not just in exported functions.][54451]
1452 - [You can now use parentheses in pattern matches.][54497]
1456 - [Updated musl to 1.1.20][54430]
1460 - [You can now convert `num::NonZero*` types to their raw equivalents using the
1461 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
1462 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
1463 into `Option<&mut T>` using the `From` trait.][53218]
1464 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
1469 - [`slice::align_to`]
1470 - [`slice::align_to_mut`]
1471 - [`slice::chunks_exact`]
1472 - [`slice::chunks_exact_mut`]
1473 - [`slice::rchunks`]
1474 - [`slice::rchunks_mut`]
1475 - [`slice::rchunks_exact`]
1476 - [`slice::rchunks_exact_mut`]
1477 - [`Option::replace`]
1481 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
1482 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
1483 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
1485 [52813]: https://github.com/rust-lang/rust/pull/52813/
1486 [53218]: https://github.com/rust-lang/rust/pull/53218/
1487 [53555]: https://github.com/rust-lang/rust/issues/53555/
1488 [54057]: https://github.com/rust-lang/rust/pull/54057/
1489 [54240]: https://github.com/rust-lang/rust/pull/54240/
1490 [54430]: https://github.com/rust-lang/rust/pull/54430/
1491 [54451]: https://github.com/rust-lang/rust/pull/54451/
1492 [54497]: https://github.com/rust-lang/rust/pull/54497/
1493 [54778]: https://github.com/rust-lang/rust/pull/54778/
1494 [54835]: https://github.com/rust-lang/rust/pull/54835/
1495 [54870]: https://github.com/rust-lang/rust/pull/54870/
1496 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1497 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1498 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1499 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1500 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1501 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1502 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1503 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1504 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1505 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1506 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1507 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1508 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1509 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1511 Version 1.30.1 (2018-11-08)
1512 ===========================
1514 - [Fixed overflow ICE in rustdoc][54199]
1515 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1517 [54199]: https://github.com/rust-lang/rust/pull/54199
1518 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1520 Version 1.30.0 (2018-10-25)
1521 ==========================
1525 - [Procedural macros are now available.][52081] These kinds of macros allow for
1526 more powerful code generation. There is a [new chapter available][proc-macros]
1527 in the Rust Programming Language book that goes further in depth.
1528 - [You can now use keywords as identifiers using the raw identifiers
1529 syntax (`r#`),][53236] e.g. `let r#for = true;`
1530 - [Using anonymous parameters in traits is now deprecated with a warning and
1531 will be a hard error in the 2018 edition.][53272]
1532 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1533 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1534 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1535 Previously, using a external crate in a module without a use statement
1536 required `let json = ::serde_json::from_str(foo);` but can now be written
1537 as `let json = serde_json::from_str(foo);`.
1538 - [You can now apply the `#[used]` attribute to static items to prevent the
1539 compiler from optimising them away, even if they appear to be unused,][51363]
1540 e.g. `#[used] static FOO: u32 = 1;`
1541 - [You can now import and reexport macros from other crates with the `use`
1542 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1543 the root module of the crate. If your macro relies on calling other local
1544 macros, it is recommended to export with the
1545 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1547 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1548 using the `vis` specifier.][53370]
1549 - [Non-macro attributes now allow all forms of literals, not just
1550 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1551 write `#[attr(true)]`.
1552 - [You can now specify a function to handle a panic in the Rust runtime with the
1553 `#[panic_handler]` attribute.][51366]
1557 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1558 - [Added the `aarch64-unknown-netbsd` target][53165]
1562 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1566 - [`Ipv4Addr::BROADCAST`]
1567 - [`Ipv4Addr::LOCALHOST`]
1568 - [`Ipv4Addr::UNSPECIFIED`]
1569 - [`Ipv6Addr::LOCALHOST`]
1570 - [`Ipv6Addr::UNSPECIFIED`]
1571 - [`Iterator::find_map`]
1573 The following methods are replacement methods for `trim_left`, `trim_right`,
1574 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
1576 - [`str::trim_end_matches`]
1578 - [`str::trim_start_matches`]
1579 - [`str::trim_start`]
1583 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
1584 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
1585 equivalent to calling `rustdoc --error-format=json`.
1586 - [Cargo will now provide a progress bar for builds.][cargo/5995]
1590 - [`rustdoc` allows you to specify what edition to treat your code as with the
1591 `--edition` option.][54057]
1592 - [`rustdoc` now has the `--color` (specify whether to output color) and
1593 `--error-format` (specify error format, e.g. `json`) options.][53003]
1594 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
1595 debug symbols.][53774]
1596 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
1597 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
1599 [50911]: https://github.com/rust-lang/rust/pull/50911/
1600 [51363]: https://github.com/rust-lang/rust/pull/51363/
1601 [51366]: https://github.com/rust-lang/rust/pull/51366/
1602 [52081]: https://github.com/rust-lang/rust/pull/52081/
1603 [53003]: https://github.com/rust-lang/rust/pull/53003/
1604 [53033]: https://github.com/rust-lang/rust/pull/53033/
1605 [53044]: https://github.com/rust-lang/rust/pull/53044/
1606 [53165]: https://github.com/rust-lang/rust/pull/53165/
1607 [53213]: https://github.com/rust-lang/rust/pull/53213/
1608 [53236]: https://github.com/rust-lang/rust/pull/53236/
1609 [53272]: https://github.com/rust-lang/rust/pull/53272/
1610 [53370]: https://github.com/rust-lang/rust/pull/53370/
1611 [53459]: https://github.com/rust-lang/rust/pull/53459/
1612 [53774]: https://github.com/rust-lang/rust/pull/53774/
1613 [53822]: https://github.com/rust-lang/rust/pull/53822/
1614 [54057]: https://github.com/rust-lang/rust/pull/54057/
1615 [54146]: https://github.com/rust-lang/rust/pull/54146/
1616 [54404]: https://github.com/rust-lang/rust/pull/54404/
1617 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
1618 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
1619 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
1620 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
1622 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
1623 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
1624 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
1625 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
1626 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
1627 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
1628 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
1629 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
1630 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
1631 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
1634 Version 1.29.2 (2018-10-11)
1635 ===========================
1637 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
1638 - The `rls-preview` component on the windows-gnu targets has been restored.
1640 [54639]: https://github.com/rust-lang/rust/pull/54639
1643 Version 1.29.1 (2018-09-25)
1644 ===========================
1649 - The standard library's `str::repeat` function contained an out of bounds write
1650 caused by an integer overflow. This has been fixed by deterministically
1651 panicking when an overflow happens.
1653 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
1657 Version 1.29.0 (2018-09-13)
1658 ==========================
1662 - [Bumped minimum LLVM version to 5.0.][51899]
1663 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
1664 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
1668 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
1669 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
1670 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
1671 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
1673 - [`Cell<T>` now allows `T` to be unsized.][50494]
1674 - [`SocketAddr` is now stable on Redox.][52656]
1679 - [`Iterator::flatten`]
1684 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
1685 `--locked` to disable this behavior.
1686 - [`cargo-install` will now allow you to cross compile an install
1687 using `--target`.][cargo/5614]
1688 - [Added the `cargo-fix` subcommand to automatically move project code from
1689 2015 edition to 2018.][cargo/5723]
1690 - [`cargo doc` can now optionally document private types using the
1691 `--document-private-items` flag.][cargo/5543]
1695 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
1696 the specified level to that level.][52354] For example `--cap-lints warn`
1697 will demote `deny` and `forbid` lints to `warn`.
1698 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
1699 fails and `101` if there is a panic.][52197]
1700 - [A preview of clippy has been made available through rustup.][51122]
1701 You can install the preview with `rustup component add clippy-preview`.
1705 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
1706 Use `str::get_unchecked(begin..end)` instead.
1707 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
1708 Consider using the `home_dir` function from
1709 https://crates.io/crates/dirs instead.
1710 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
1711 - [`cfg` attributes and `--cfg` command line flags are now more
1712 strictly validated.][53893]
1714 [53893]: https://github.com/rust-lang/rust/pull/53893/
1715 [52861]: https://github.com/rust-lang/rust/pull/52861/
1716 [52656]: https://github.com/rust-lang/rust/pull/52656/
1717 [52239]: https://github.com/rust-lang/rust/pull/52239/
1718 [52330]: https://github.com/rust-lang/rust/pull/52330/
1719 [52354]: https://github.com/rust-lang/rust/pull/52354/
1720 [52402]: https://github.com/rust-lang/rust/pull/52402/
1721 [52103]: https://github.com/rust-lang/rust/pull/52103/
1722 [52197]: https://github.com/rust-lang/rust/pull/52197/
1723 [51807]: https://github.com/rust-lang/rust/pull/51807/
1724 [51899]: https://github.com/rust-lang/rust/pull/51899/
1725 [51912]: https://github.com/rust-lang/rust/pull/51912/
1726 [51511]: https://github.com/rust-lang/rust/pull/51511/
1727 [51619]: https://github.com/rust-lang/rust/pull/51619/
1728 [51656]: https://github.com/rust-lang/rust/pull/51656/
1729 [51178]: https://github.com/rust-lang/rust/pull/51178/
1730 [51122]: https://github.com/rust-lang/rust/pull/51122
1731 [50494]: https://github.com/rust-lang/rust/pull/50494/
1732 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
1733 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
1734 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
1735 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
1736 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
1737 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
1738 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
1741 Version 1.28.0 (2018-08-02)
1742 ===========================
1746 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
1747 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
1748 the inner type across Foreign Function Interface (FFI) boundaries.
1749 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
1750 and can now be used as identifiers.][51196]
1751 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
1752 stable.][51241] This will allow users to specify a global allocator for
1754 - [Unit test functions marked with the `#[test]` attribute can now return
1755 `Result<(), E: Debug>` in addition to `()`.][51298]
1756 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
1757 allows macros to easily target lifetimes.
1761 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
1762 prioritise making smaller binary sizes. `z` is the same as `s` with the
1763 exception that it does not vectorise loops, which typically results in an even
1765 - [The short error format is now stable.][49546] Specified with
1766 `--error-format=short` this option will provide a more compressed output of
1767 rust error messages.
1768 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
1769 - [Reduced the number of allocations in the macro parser.][50855] This can
1770 improve compile times of macro heavy crates on average by 5%.
1774 - [Implemented `Default` for `&mut str`.][51306]
1775 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
1776 - [Implemented `Extend` for `()`.][50234]
1777 - [The `Debug` implementation of `time::Duration` should now be more easily
1778 human readable.][50364] Previously a `Duration` of one second would printed as
1779 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
1780 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
1781 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
1782 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
1783 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
1784 for `PathBuf`.][50170]
1785 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
1786 and `Wrapping<i128>`.][50465]
1787 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
1788 possible.][51050] This can provide up to a 40% speed increase.
1789 - [Improved error messages when using `format!`.][50610]
1793 - [`Iterator::step_by`]
1794 - [`Path::ancestors`]
1795 - [`SystemTime::UNIX_EPOCH`]
1796 - [`alloc::GlobalAlloc`]
1798 - [`alloc::LayoutErr`]
1801 - [`alloc::alloc_zeroed`]
1802 - [`alloc::dealloc`]
1803 - [`alloc::realloc`]
1804 - [`alloc::handle_alloc_error`]
1805 - [`btree_map::Entry::or_default`]
1806 - [`fmt::Alignment`]
1807 - [`hash_map::Entry::or_default`]
1808 - [`iter::repeat_with`]
1809 - [`num::NonZeroUsize`]
1810 - [`num::NonZeroU128`]
1811 - [`num::NonZeroU16`]
1812 - [`num::NonZeroU32`]
1813 - [`num::NonZeroU64`]
1814 - [`num::NonZeroU8`]
1815 - [`ops::RangeBounds`]
1816 - [`slice::SliceIndex`]
1817 - [`slice::from_mut`]
1818 - [`slice::from_ref`]
1819 - [`{Any + Send + Sync}::downcast_mut`]
1820 - [`{Any + Send + Sync}::downcast_ref`]
1821 - [`{Any + Send + Sync}::is`]
1825 - [Cargo will now no longer allow you to publish crates with build scripts that
1826 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
1827 considered to be immutable.
1831 - [The `suggestion_applicability` field in `rustc`'s json output is now
1832 stable.][50486] This will allow dev tools to check whether a code suggestion
1833 would apply to them.
1837 - [Rust will consider trait objects with duplicated constraints to be the same
1838 type as without the duplicated constraint.][51276] For example the below code will
1839 now fail to compile.
1844 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
1847 impl Trait + Send + Send {
1848 fn test(&self) { println!("two"); }
1852 [49546]: https://github.com/rust-lang/rust/pull/49546/
1853 [50143]: https://github.com/rust-lang/rust/pull/50143/
1854 [50170]: https://github.com/rust-lang/rust/pull/50170/
1855 [50234]: https://github.com/rust-lang/rust/pull/50234/
1856 [50265]: https://github.com/rust-lang/rust/pull/50265/
1857 [50364]: https://github.com/rust-lang/rust/pull/50364/
1858 [50385]: https://github.com/rust-lang/rust/pull/50385/
1859 [50465]: https://github.com/rust-lang/rust/pull/50465/
1860 [50486]: https://github.com/rust-lang/rust/pull/50486/
1861 [50554]: https://github.com/rust-lang/rust/pull/50554/
1862 [50610]: https://github.com/rust-lang/rust/pull/50610/
1863 [50855]: https://github.com/rust-lang/rust/pull/50855/
1864 [51050]: https://github.com/rust-lang/rust/pull/51050/
1865 [51196]: https://github.com/rust-lang/rust/pull/51196/
1866 [51200]: https://github.com/rust-lang/rust/pull/51200/
1867 [51241]: https://github.com/rust-lang/rust/pull/51241/
1868 [51276]: https://github.com/rust-lang/rust/pull/51276/
1869 [51298]: https://github.com/rust-lang/rust/pull/51298/
1870 [51306]: https://github.com/rust-lang/rust/pull/51306/
1871 [51562]: https://github.com/rust-lang/rust/pull/51562/
1872 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
1873 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
1874 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
1875 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
1876 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
1877 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
1878 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
1879 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
1880 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
1881 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
1882 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
1883 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
1884 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
1885 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
1886 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
1887 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
1888 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
1889 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
1890 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
1891 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
1892 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
1893 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
1894 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
1895 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
1896 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
1897 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
1898 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
1899 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
1900 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
1901 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
1903 Version 1.27.2 (2018-07-20)
1904 ===========================
1909 - The borrow checker was fixed to avoid potential unsoundness when using
1910 match ergonomics: [#52213][52213].
1912 [52213]: https://github.com/rust-lang/rust/issues/52213
1914 Version 1.27.1 (2018-07-10)
1915 ===========================
1920 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
1921 when running, which enabled executing code as some other user on a
1922 given machine. This release fixes that vulnerability; you can read
1923 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
1925 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
1930 - The borrow checker was fixed to avoid an additional potential unsoundness when using
1931 match ergonomics: [#51415][51415], [#49534][49534].
1933 [51415]: https://github.com/rust-lang/rust/issues/51415
1934 [49534]: https://github.com/rust-lang/rust/issues/49534
1935 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
1936 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
1938 Version 1.27.0 (2018-06-21)
1939 ==========================
1943 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
1944 be used as an identifier.
1945 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
1946 bare `Trait` syntax, and should make it clearer when being used in tandem with
1947 `impl Trait` because it is equivalent to the following syntax:
1948 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
1949 `Box<Trait> == Box<dyn Trait>`.
1950 - [Attributes on generic parameters such as types and lifetimes are
1951 now stable.][48851] e.g.
1952 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
1953 - [The `#[must_use]` attribute can now also be used on functions as well as
1954 types.][48925] It provides a lint that by default warns users when the
1955 value returned by a function has not been used.
1959 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
1963 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
1964 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
1965 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
1966 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
1967 the `cfg` attribute.
1968 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
1969 std are now available in core.][49896]
1970 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
1972 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
1973 that the operation isn't done in place.
1974 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
1975 the `#[must_use]` attribute][49533] to warn about unused potentially
1976 expensive allocations.
1980 - [`DoubleEndedIterator::rfind`]
1981 - [`DoubleEndedIterator::rfold`]
1982 - [`DoubleEndedIterator::try_rfold`]
1983 - [`Duration::from_micros`]
1984 - [`Duration::from_nanos`]
1985 - [`Duration::subsec_micros`]
1986 - [`Duration::subsec_millis`]
1987 - [`HashMap::remove_entry`]
1988 - [`Iterator::try_fold`]
1989 - [`Iterator::try_for_each`]
1991 - [`Option::filter`]
1992 - [`String::replace_range`]
1993 - [`Take::set_limit`]
1994 - [`hint::unreachable_unchecked`]
1995 - [`os::unix::process::parent_id`]
1996 - [`ptr::swap_nonoverlapping`]
1997 - [`slice::rsplit_mut`]
1999 - [`slice::swap_with_slice`]
2003 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2004 `readme`, and `repository` fields.][cargo/5386]
2005 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2006 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2007 a different directory than `target` for placing compilation artifacts.
2008 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2009 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2010 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2011 where cargo would infer a binary, Cargo will produce a warning. You can
2012 disable this feature ahead of time by setting any of the following to false:
2013 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2014 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2015 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2019 - [Added “The Rustc book” into the official documentation.][49707]
2020 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2021 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2025 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2026 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2027 compile, `"".is_empty()` will still compile.
2028 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2029 will only print the inner type.][48553] E.g.
2030 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2031 not `AtomicBool(true)`.
2032 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2033 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2034 alignment should cover all use cases.
2035 - The `.description()` method on the `std::error::Error` trait
2036 [has been soft-deprecated][50163]. It is no longer required to implement it.
2038 [48553]: https://github.com/rust-lang/rust/pull/48553/
2039 [48851]: https://github.com/rust-lang/rust/pull/48851/
2040 [48925]: https://github.com/rust-lang/rust/pull/48925/
2041 [49533]: https://github.com/rust-lang/rust/pull/49533/
2042 [49623]: https://github.com/rust-lang/rust/pull/49623/
2043 [49630]: https://github.com/rust-lang/rust/pull/49630/
2044 [49664]: https://github.com/rust-lang/rust/pull/49664/
2045 [49699]: https://github.com/rust-lang/rust/pull/49699/
2046 [49707]: https://github.com/rust-lang/rust/pull/49707/
2047 [49719]: https://github.com/rust-lang/rust/pull/49719/
2048 [49896]: https://github.com/rust-lang/rust/pull/49896/
2049 [49968]: https://github.com/rust-lang/rust/pull/49968/
2050 [50163]: https://github.com/rust-lang/rust/pull/50163
2051 [50177]: https://github.com/rust-lang/rust/pull/50177/
2052 [50378]: https://github.com/rust-lang/rust/pull/50378/
2053 [50398]: https://github.com/rust-lang/rust/pull/50398/
2054 [50423]: https://github.com/rust-lang/rust/pull/50423/
2055 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2056 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2057 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2058 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2059 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2060 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2061 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2062 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2063 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2064 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2065 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2066 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2067 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2068 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2069 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2070 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2071 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2072 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2073 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2074 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2075 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2076 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2077 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2078 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2079 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2080 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2081 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2082 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2083 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2084 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2087 Version 1.26.2 (2018-06-05)
2088 ==========================
2093 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2095 [51117]: https://github.com/rust-lang/rust/issues/51117
2098 Version 1.26.1 (2018-05-29)
2099 ==========================
2104 - [RLS now works on Windows.][50646]
2105 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2111 - [`fn main() -> impl Trait` no longer works for non-Termination
2113 This reverts an accidental stabilization.
2114 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2115 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2117 [50646]: https://github.com/rust-lang/rust/issues/50646
2118 [50656]: https://github.com/rust-lang/rust/pull/50656
2119 [50812]: https://github.com/rust-lang/rust/pull/50812
2120 [50950]: https://github.com/rust-lang/rust/issues/50950
2121 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2123 Version 1.26.0 (2018-05-10)
2124 ==========================
2128 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2129 implement either or both traits.][49299]
2130 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2131 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2132 lifetime can be elided.][49458]
2133 - [`impl Trait` is now stable allowing you to have abstract types in returns
2134 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2135 `fn open(path: impl AsRef<Path>)`.
2136 - [Pattern matching will now automatically apply dereferences.][49394]
2137 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2138 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2139 - [A lot of operations are now available in a const context.][46882] E.g. You
2140 can now index into constant arrays, reference and dereference into constants,
2141 and use tuple struct constructors.
2142 - [Fixed entry slice patterns are now stable.][48516] E.g.
2144 let points = [1, 2, 3, 4];
2146 [1, 2, 3, 4] => println!("All points were sequential."),
2147 _ => println!("Not all points were sequential."),
2154 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2155 - [Fixed exponential projection complexity on nested types.][48296]
2156 This can provide up to a ~12% reduction in compile times for certain crates.
2157 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2158 to remap path prefixes outputted by the compiler.
2159 - [Added `powerpc-unknown-netbsd` target.][48281]
2163 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2164 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2165 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2166 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2167 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2168 - [`ascii::escape_default` is now available in libcore.][48735]
2169 - [Trailing commas are now supported in std and core macros.][48056]
2170 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2171 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2176 - [`*const T::copy_to_nonoverlapping`]
2177 - [`*const T::copy_to`]
2178 - [`*const T::read_unaligned`]
2179 - [`*const T::read_volatile`]
2180 - [`*const T::read`]
2182 - [`*const T::wrapping_add`]
2183 - [`*const T::wrapping_sub`]
2185 - [`*mut T::copy_to_nonoverlapping`]
2186 - [`*mut T::copy_to`]
2187 - [`*mut T::read_unaligned`]
2188 - [`*mut T::read_volatile`]
2190 - [`*mut T::replace`]
2193 - [`*mut T::wrapping_add`]
2194 - [`*mut T::wrapping_sub`]
2195 - [`*mut T::write_bytes`]
2196 - [`*mut T::write_unaligned`]
2197 - [`*mut T::write_volatile`]
2200 - [`FromUtf8Error::as_bytes`]
2201 - [`LocalKey::try_with`]
2202 - [`Option::cloned`]
2203 - [`btree_map::Entry::and_modify`]
2204 - [`fs::read_to_string`]
2207 - [`hash_map::Entry::and_modify`]
2208 - [`iter::FusedIterator`]
2209 - [`ops::RangeInclusive`]
2210 - [`ops::RangeToInclusive`]
2212 - [`slice::rotate_left`]
2213 - [`slice::rotate_right`]
2214 - [`String::retain`]
2219 - [Cargo will now output path to custom commands when `-v` is
2220 passed with `--list`][cargo/5041]
2221 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2225 - [The second edition of "The Rust Programming Language" book is now recommended
2226 over the first.][48404]
2231 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2232 syntax is now invalid.
2234 use std::ops::Fn as dyn;
2235 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2237 - [The result of dereferences are no longer promoted to `'static`.][47408]
2241 const PAIR: &(i32, i32) = &(0, 1);
2242 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2245 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2246 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2248 - [Removed hoedown from rustdoc.][48274]
2249 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2251 [46882]: https://github.com/rust-lang/rust/pull/46882
2252 [47379]: https://github.com/rust-lang/rust/pull/47379
2253 [47408]: https://github.com/rust-lang/rust/pull/47408
2254 [47813]: https://github.com/rust-lang/rust/pull/47813
2255 [48056]: https://github.com/rust-lang/rust/pull/48056
2256 [48125]: https://github.com/rust-lang/rust/pull/48125
2257 [48166]: https://github.com/rust-lang/rust/pull/48166
2258 [48235]: https://github.com/rust-lang/rust/pull/48235
2259 [48274]: https://github.com/rust-lang/rust/pull/48274
2260 [48281]: https://github.com/rust-lang/rust/pull/48281
2261 [48296]: https://github.com/rust-lang/rust/pull/48296
2262 [48326]: https://github.com/rust-lang/rust/pull/48326
2263 [48359]: https://github.com/rust-lang/rust/pull/48359
2264 [48404]: https://github.com/rust-lang/rust/pull/48404
2265 [48481]: https://github.com/rust-lang/rust/pull/48481
2266 [48516]: https://github.com/rust-lang/rust/pull/48516
2267 [48628]: https://github.com/rust-lang/rust/pull/48628
2268 [48629]: https://github.com/rust-lang/rust/pull/48629
2269 [48657]: https://github.com/rust-lang/rust/pull/48657
2270 [48735]: https://github.com/rust-lang/rust/pull/48735
2271 [48978]: https://github.com/rust-lang/rust/pull/48978
2272 [49101]: https://github.com/rust-lang/rust/pull/49101
2273 [49109]: https://github.com/rust-lang/rust/pull/49109
2274 [49121]: https://github.com/rust-lang/rust/pull/49121
2275 [49162]: https://github.com/rust-lang/rust/pull/49162
2276 [49184]: https://github.com/rust-lang/rust/pull/49184
2277 [49234]: https://github.com/rust-lang/rust/pull/49234
2278 [49255]: https://github.com/rust-lang/rust/pull/49255
2279 [49299]: https://github.com/rust-lang/rust/pull/49299
2280 [49305]: https://github.com/rust-lang/rust/pull/49305
2281 [49394]: https://github.com/rust-lang/rust/pull/49394
2282 [49458]: https://github.com/rust-lang/rust/pull/49458
2283 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2284 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2285 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2286 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2287 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2288 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2289 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2290 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2291 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2292 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2293 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2294 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2295 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2296 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2297 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2298 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2299 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2300 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2301 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2302 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2303 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2304 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2305 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2306 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2307 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2308 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2309 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2310 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2311 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2312 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2313 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2314 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2315 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2316 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2317 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2318 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2319 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2320 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2321 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2322 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2323 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2324 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2327 Version 1.25.0 (2018-03-29)
2328 ==========================
2332 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2333 - [You can now use nested groups of imports.][47948]
2334 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2335 - [You can now have `|` at the start of a match arm.][47947] e.g.
2337 enum Foo { A, B, C }
2343 | Foo::B => println!("AB"),
2344 | Foo::C => println!("C"),
2351 - [Upgraded to LLVM 6.][47828]
2352 - [Added `-C lto=val` option.][47521]
2353 - [Added `i586-unknown-linux-musl` target][47282]
2357 - [Impl Send for `process::Command` on Unix.][47760]
2358 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2359 - [`UnsafeCell::into_inner` is now safe.][47204]
2360 - [Implement libstd for CloudABI.][47268]
2361 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2362 - [Implement `AsRef<Path>` for Component][46985]
2363 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2364 - [Moved `Duration` to libcore.][46666]
2368 - [`Location::column`]
2371 The following functions can now be used in a constant expression.
2372 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2373 - [`Duration::new`][47300]
2374 - [`Duration::from_secs`][47300]
2375 - [`Duration::from_millis`][47300]
2379 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2380 - [`cargo new` now defaults to creating a binary crate, instead of a
2381 library crate.][cargo/5029]
2385 - [Rust by example is now shipped with new releases][46196]
2389 - [Deprecated `net::lookup_host`.][47510]
2390 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2391 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2392 around indexing operations (see [#47349][47349]). This has been fixed (which also
2393 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2394 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2396 [33903]: https://github.com/rust-lang/rust/pull/33903
2397 [47947]: https://github.com/rust-lang/rust/pull/47947
2398 [47948]: https://github.com/rust-lang/rust/pull/47948
2399 [47760]: https://github.com/rust-lang/rust/pull/47760
2400 [47790]: https://github.com/rust-lang/rust/pull/47790
2401 [47828]: https://github.com/rust-lang/rust/pull/47828
2402 [47398]: https://github.com/rust-lang/rust/pull/47398
2403 [47510]: https://github.com/rust-lang/rust/pull/47510
2404 [47521]: https://github.com/rust-lang/rust/pull/47521
2405 [47204]: https://github.com/rust-lang/rust/pull/47204
2406 [47251]: https://github.com/rust-lang/rust/pull/47251
2407 [47268]: https://github.com/rust-lang/rust/pull/47268
2408 [47282]: https://github.com/rust-lang/rust/pull/47282
2409 [47300]: https://github.com/rust-lang/rust/pull/47300
2410 [47349]: https://github.com/rust-lang/rust/pull/47349
2411 [46931]: https://github.com/rust-lang/rust/pull/46931
2412 [46985]: https://github.com/rust-lang/rust/pull/46985
2413 [47006]: https://github.com/rust-lang/rust/pull/47006
2414 [46830]: https://github.com/rust-lang/rust/pull/46830
2415 [46095]: https://github.com/rust-lang/rust/pull/46095
2416 [46666]: https://github.com/rust-lang/rust/pull/46666
2417 [46196]: https://github.com/rust-lang/rust/pull/46196
2418 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
2419 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
2420 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
2421 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
2422 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
2425 Version 1.24.1 (2018-03-01)
2426 ==========================
2428 - [Do not abort when unwinding through FFI][48251]
2429 - [Emit UTF-16 files for linker arguments on Windows][48318]
2430 - [Make the error index generator work again][48308]
2431 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
2433 [48251]: https://github.com/rust-lang/rust/issues/48251
2434 [48308]: https://github.com/rust-lang/rust/issues/48308
2435 [48318]: https://github.com/rust-lang/rust/issues/48318
2436 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
2439 Version 1.24.0 (2018-02-15)
2440 ==========================
2444 - [External `sysv64` ffi is now available.][46528]
2445 eg. `extern "sysv64" fn foo () {}`
2449 - [rustc now uses 16 codegen units by default for release builds.][46910]
2450 For the fastest builds, utilize `codegen-units=1`.
2451 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
2452 - [Add `aarch64-unknown-openbsd` support][46760]
2456 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
2457 improvement in performance in the majority of cases.
2458 - [`OsStr`'s `Debug` implementation is now lossless and consistent
2459 with Windows.][46798]
2460 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
2461 - [impl `From<bool>` for `AtomicBool`][46293]
2462 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
2463 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
2464 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
2465 - [float::from_bits now just uses transmute.][46012] This provides
2466 some optimisations from LLVM.
2467 - [Copied `AsciiExt` methods onto `char`][46077]
2468 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
2469 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
2470 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
2471 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
2475 - [`RefCell::replace`]
2477 - [`atomic::spin_loop_hint`]
2479 The following functions can now be used in a constant expression.
2480 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
2482 - [`AtomicBool::new`][46287]
2483 - [`AtomicUsize::new`][46287]
2484 - [`AtomicIsize::new`][46287]
2485 - [`AtomicPtr::new`][46287]
2486 - [`Cell::new`][46287]
2487 - [`{integer}::min_value`][46287]
2488 - [`{integer}::max_value`][46287]
2489 - [`mem::size_of`][46287]
2490 - [`mem::align_of`][46287]
2491 - [`ptr::null`][46287]
2492 - [`ptr::null_mut`][46287]
2493 - [`RefCell::new`][46287]
2494 - [`UnsafeCell::new`][46287]
2498 - [Added a `workspace.default-members` config that
2499 overrides implied `--all` in virtual workspaces.][cargo/4743]
2500 - [Enable incremental by default on development builds.][cargo/4817] Also added
2501 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2502 per-project or global basis respectively.
2509 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2510 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2511 in accordance with IETF RFC 4291 §2.2.
2512 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2513 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2514 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2515 - [Leading zeros in tuple struct members is now an error][47084]
2516 - [`column!()` macro is one-based instead of zero-based][46977]
2517 - [`fmt::Arguments` can no longer be shared across threads][45198]
2518 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2519 - [Cargo sets a different working directory for the compiler][cargo/4788]
2521 [44884]: https://github.com/rust-lang/rust/pull/44884
2522 [45198]: https://github.com/rust-lang/rust/pull/45198
2523 [45506]: https://github.com/rust-lang/rust/pull/45506
2524 [45904]: https://github.com/rust-lang/rust/pull/45904
2525 [45990]: https://github.com/rust-lang/rust/pull/45990
2526 [46012]: https://github.com/rust-lang/rust/pull/46012
2527 [46077]: https://github.com/rust-lang/rust/pull/46077
2528 [46094]: https://github.com/rust-lang/rust/pull/46094
2529 [46284]: https://github.com/rust-lang/rust/pull/46284
2530 [46287]: https://github.com/rust-lang/rust/pull/46287
2531 [46293]: https://github.com/rust-lang/rust/pull/46293
2532 [46528]: https://github.com/rust-lang/rust/pull/46528
2533 [46671]: https://github.com/rust-lang/rust/pull/46671
2534 [46713]: https://github.com/rust-lang/rust/pull/46713
2535 [46735]: https://github.com/rust-lang/rust/pull/46735
2536 [46749]: https://github.com/rust-lang/rust/pull/46749
2537 [46760]: https://github.com/rust-lang/rust/pull/46760
2538 [46798]: https://github.com/rust-lang/rust/pull/46798
2539 [46828]: https://github.com/rust-lang/rust/pull/46828
2540 [46831]: https://github.com/rust-lang/rust/pull/46831
2541 [46833]: https://github.com/rust-lang/rust/pull/46833
2542 [46910]: https://github.com/rust-lang/rust/pull/46910
2543 [46977]: https://github.com/rust-lang/rust/pull/46977
2544 [47018]: https://github.com/rust-lang/rust/pull/47018
2545 [47080]: https://github.com/rust-lang/rust/pull/47080
2546 [47084]: https://github.com/rust-lang/rust/pull/47084
2547 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2548 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2549 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2550 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2551 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2552 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2555 Version 1.23.0 (2018-01-04)
2556 ==========================
2560 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2561 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2562 Which should fix some confusing errors in some operations.
2566 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2567 undefined behavior.][45920]
2568 - [rustc now suggests renaming import if names clash.][45660]
2569 - [Display errors/warnings correctly when there are zero-width or
2570 wide characters.][45711]
2571 - [rustc now avoids unnecessary copies of arguments that are
2572 simple bindings][45380] This should improve memory usage on average by 5-10%.
2573 - [Updated musl used to build musl rustc to 1.1.17][45393]
2577 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
2578 - [Implement Hash for raw pointers to unsized types][45483]
2579 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
2580 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
2581 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
2582 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
2583 and `<*mut T>::as_mut`][44932]
2584 - [Optimized `Thread::{park, unpark}` implementation][45524]
2585 - [Improved `SliceExt::binary_search` performance.][45333]
2586 - [impl `FromIterator<()>` for `()`][45379]
2587 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
2595 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
2596 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
2597 - [Added unit test checking to `cargo check`][cargo/4592]
2598 - [Cargo now lets you install a specific version
2599 using `cargo install --version`][cargo/4637]
2603 - [Releases now ship with the Cargo book documentation.][45692]
2604 - [rustdoc now prints rendering warnings on every run.][45324]
2608 - [Changes have been made to type equality to make it more correct,
2609 in rare cases this could break some code.][45853] [Tracking issue for
2610 further information][45852]
2611 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
2612 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
2613 Android 9, the minimum supported version is Android 14.
2614 - [Bumped the minimum LLVM to 3.9][45326]
2616 [44042]: https://github.com/rust-lang/rust/pull/44042
2617 [44932]: https://github.com/rust-lang/rust/pull/44932
2618 [45267]: https://github.com/rust-lang/rust/pull/45267
2619 [45324]: https://github.com/rust-lang/rust/pull/45324
2620 [45326]: https://github.com/rust-lang/rust/pull/45326
2621 [45333]: https://github.com/rust-lang/rust/pull/45333
2622 [45379]: https://github.com/rust-lang/rust/pull/45379
2623 [45380]: https://github.com/rust-lang/rust/pull/45380
2624 [45393]: https://github.com/rust-lang/rust/pull/45393
2625 [45435]: https://github.com/rust-lang/rust/pull/45435
2626 [45483]: https://github.com/rust-lang/rust/pull/45483
2627 [45524]: https://github.com/rust-lang/rust/pull/45524
2628 [45571]: https://github.com/rust-lang/rust/pull/45571
2629 [45580]: https://github.com/rust-lang/rust/pull/45580
2630 [45610]: https://github.com/rust-lang/rust/pull/45610
2631 [45660]: https://github.com/rust-lang/rust/pull/45660
2632 [45692]: https://github.com/rust-lang/rust/pull/45692
2633 [45711]: https://github.com/rust-lang/rust/pull/45711
2634 [45772]: https://github.com/rust-lang/rust/pull/45772
2635 [45852]: https://github.com/rust-lang/rust/issues/45852
2636 [45853]: https://github.com/rust-lang/rust/pull/45853
2637 [45887]: https://github.com/rust-lang/rust/pull/45887
2638 [45920]: https://github.com/rust-lang/rust/pull/45920
2639 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
2640 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
2641 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
2644 Version 1.22.1 (2017-11-22)
2645 ==========================
2647 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
2649 [46183]: https://github.com/rust-lang/rust/pull/46183
2651 Version 1.22.0 (2017-11-22)
2652 ==========================
2656 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
2657 - [Now accepts underscores in unicode escapes][43716]
2658 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
2659 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
2663 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
2664 - [rustc will no longer inline in codegen units when compiling for debug][45075]
2665 This should decrease compile times for debug builds.
2666 - [strict memory alignment now enabled on ARMv6][45094]
2667 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
2671 - [Allow atomic operations up to 32 bits
2672 on `armv5te_unknown_linux_gnueabi`][44978]
2673 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
2674 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
2675 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
2676 - [Properly detect overflow in `Instant += Duration`.][44220]
2677 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
2678 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
2679 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
2686 - [Cargo will now build multi file examples in subdirectories of the `examples`
2687 folder that have a `main.rs` file.][cargo/4496]
2688 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
2689 the old format will continue to work and can be updated with `cargo update`.
2690 - [Now supports vendoring git repositories][cargo/3992]
2694 - [`libbacktrace` is now available on Apple platforms.][44251]
2695 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
2696 This now lets you specify that a given code example will fail to compile.
2700 - [The minimum Android version that rustc can build for has been bumped
2701 to `4.0` from `2.3`][45656]
2702 - [Allowing `T op= &T` for numeric types has broken some type
2703 inference cases][45480]
2706 [42526]: https://github.com/rust-lang/rust/pull/42526
2707 [43017]: https://github.com/rust-lang/rust/pull/43017
2708 [43716]: https://github.com/rust-lang/rust/pull/43716
2709 [43949]: https://github.com/rust-lang/rust/pull/43949
2710 [44015]: https://github.com/rust-lang/rust/pull/44015
2711 [44220]: https://github.com/rust-lang/rust/pull/44220
2712 [44251]: https://github.com/rust-lang/rust/pull/44251
2713 [44287]: https://github.com/rust-lang/rust/pull/44287
2714 [44303]: https://github.com/rust-lang/rust/pull/44303
2715 [44456]: https://github.com/rust-lang/rust/pull/44456
2716 [44466]: https://github.com/rust-lang/rust/pull/44466
2717 [44895]: https://github.com/rust-lang/rust/pull/44895
2718 [44966]: https://github.com/rust-lang/rust/pull/44966
2719 [44978]: https://github.com/rust-lang/rust/pull/44978
2720 [45041]: https://github.com/rust-lang/rust/pull/45041
2721 [45064]: https://github.com/rust-lang/rust/pull/45064
2722 [45075]: https://github.com/rust-lang/rust/pull/45075
2723 [45094]: https://github.com/rust-lang/rust/pull/45094
2724 [45095]: https://github.com/rust-lang/rust/pull/45095
2725 [45480]: https://github.com/rust-lang/rust/issues/45480
2726 [45656]: https://github.com/rust-lang/rust/pull/45656
2727 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
2728 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
2729 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
2736 Version 1.21.0 (2017-10-12)
2737 ==========================
2741 - [You can now use static references for literals.][43838]
2745 let x: &'static u32 = &0;
2748 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
2751 my_macro!(Vec<i32>::new); // Always worked
2752 my_macro!(Vec::<i32>::new); // Now works
2757 - [Upgraded jemalloc to 4.5.0][43911]
2758 - [Enabled unwinding panics on Redox][43917]
2759 - [Now runs LLVM in parallel during translation phase.][43506]
2760 This should reduce peak memory usage.
2764 - [Generate builtin impls for `Clone` for all arrays and tuples that
2765 are `T: Clone`][43690]
2766 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
2767 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
2768 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
2773 [`std::mem::discriminant`]
2777 - [You can now call `cargo install` with multiple package names][cargo/4216]
2778 - [Cargo commands inside a virtual workspace will now implicitly
2779 pass `--all`][cargo/4335]
2780 - [Added a `[patch]` section to `Cargo.toml` to handle
2781 prepublication dependencies][cargo/4123] [RFC 1969]
2782 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
2783 like patterns][cargo/4270]
2784 - [Added the `--all-targets` option][cargo/4400]
2785 - [Using required dependencies as a feature is now deprecated and emits
2786 a warning][cargo/4364]
2791 - [Cargo docs are moving][43916]
2792 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
2793 - [The rustdoc book is now available][43863]
2794 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
2795 - [Added a preview of RLS has been made available through rustup][44204]
2796 Install with `rustup component add rls-preview`
2797 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
2798 Previously only showed `std::os::unix`.
2802 - [Changes in method matching against higher-ranked types][43880] This may cause
2803 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
2804 - [rustc's JSON error output's byte position start at top of file.][42973]
2805 Was previously relative to the rustc's internal `CodeMap` struct which
2806 required the unstable library `libsyntax` to correctly use.
2807 - [`unused_results` lint no longer ignores booleans][43728]
2809 [42565]: https://github.com/rust-lang/rust/pull/42565
2810 [42973]: https://github.com/rust-lang/rust/pull/42973
2811 [43348]: https://github.com/rust-lang/rust/pull/43348
2812 [43459]: https://github.com/rust-lang/rust/pull/43459
2813 [43506]: https://github.com/rust-lang/rust/pull/43506
2814 [43540]: https://github.com/rust-lang/rust/pull/43540
2815 [43690]: https://github.com/rust-lang/rust/pull/43690
2816 [43728]: https://github.com/rust-lang/rust/pull/43728
2817 [43838]: https://github.com/rust-lang/rust/pull/43838
2818 [43863]: https://github.com/rust-lang/rust/pull/43863
2819 [43880]: https://github.com/rust-lang/rust/pull/43880
2820 [43911]: https://github.com/rust-lang/rust/pull/43911
2821 [43916]: https://github.com/rust-lang/rust/pull/43916
2822 [43917]: https://github.com/rust-lang/rust/pull/43917
2823 [44204]: https://github.com/rust-lang/rust/pull/44204
2824 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
2825 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
2826 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2827 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
2828 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
2829 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
2830 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
2831 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
2832 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
2834 Version 1.20.0 (2017-08-31)
2835 ===========================
2839 - [Associated constants are now stabilised.][42809]
2840 - [A lot of macro bugs are now fixed.][42913]
2845 - [Struct fields are now properly coerced to the expected field type.][42807]
2846 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
2847 `wasm32-experimental-emscripten` target.
2848 - [Changed some of the error messages to be more helpful.][42033]
2849 - [Add support for RELRO(RELocation Read-Only) for platforms that support
2851 - [rustc now reports the total number of errors on compilation failure][43015]
2852 previously this was only the number of errors in the pass that failed.
2853 - [Expansion in rustc has been sped up 29x.][42533]
2854 - [added `msp430-none-elf` target.][43099]
2855 - [rustc will now suggest one-argument enum variant to fix type mismatch when
2857 - [Fixes backtraces on Redox][43228]
2858 - [rustc now identifies different versions of same crate when absolute paths of
2859 different types match in an error message.][42826]
2865 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
2866 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
2868 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
2869 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
2870 - [Impl `Clone` for `DefaultHasher`.][42799]
2871 - [Impl `Sync` for `SyncSender`.][42397]
2872 - [Impl `FromStr` for `char`][42271]
2873 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
2875 - [allow messages in the `unimplemented!()` macro.][42155]
2876 ie. `unimplemented!("Waiting for 1.21 to be stable")`
2877 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
2878 - [Upgrade to Unicode 10.0.0][42999]
2879 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
2880 - [Skip the main thread's manual stack guard on Linux][43072]
2881 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
2882 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
2884 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
2889 - [`CStr::into_c_string`]
2890 - [`CString::as_c_str`]
2891 - [`CString::into_boxed_c_str`]
2892 - [`Chain::get_mut`]
2893 - [`Chain::get_ref`]
2894 - [`Chain::into_inner`]
2895 - [`Option::get_or_insert_with`]
2896 - [`Option::get_or_insert`]
2897 - [`OsStr::into_os_string`]
2898 - [`OsString::into_boxed_os_str`]
2901 - [`Utf8Error::error_len`]
2902 - [`char::EscapeDebug`]
2903 - [`char::escape_debug`]
2904 - [`compile_error!`]
2905 - [`f32::from_bits`]
2907 - [`f64::from_bits`]
2909 - [`mem::ManuallyDrop`]
2910 - [`slice::sort_unstable_by_key`]
2911 - [`slice::sort_unstable_by`]
2912 - [`slice::sort_unstable`]
2913 - [`str::from_boxed_utf8_unchecked`]
2914 - [`str::as_bytes_mut`]
2915 - [`str::as_bytes_mut`]
2916 - [`str::from_utf8_mut`]
2917 - [`str::from_utf8_unchecked_mut`]
2919 - [`str::get_unchecked_mut`]
2920 - [`str::get_unchecked`]
2922 - [`str::into_boxed_bytes`]
2927 - [Cargo API token location moved from `~/.cargo/config` to
2928 `~/.cargo/credentials`.][cargo/3978]
2929 - [Cargo will now build `main.rs` binaries that are in sub-directories of
2930 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
2931 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
2932 - [You can now specify version of a binary when installed through
2933 `cargo install` using `--vers`.][cargo/4229]
2934 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
2935 failure.][cargo/4248]
2936 - [Changed the convention around which file is the crate root.][cargo/4259]
2937 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
2938 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
2943 - [Functions with `'static` in their return types will now not be as usable as
2944 if they were using lifetime parameters instead.][42417]
2945 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
2946 takes the sign of NaN into account where previously didn't.][42430]
2948 [42033]: https://github.com/rust-lang/rust/pull/42033
2949 [42155]: https://github.com/rust-lang/rust/pull/42155
2950 [42271]: https://github.com/rust-lang/rust/pull/42271
2951 [42397]: https://github.com/rust-lang/rust/pull/42397
2952 [42417]: https://github.com/rust-lang/rust/pull/42417
2953 [42430]: https://github.com/rust-lang/rust/pull/42430
2954 [42431]: https://github.com/rust-lang/rust/pull/42431
2955 [42533]: https://github.com/rust-lang/rust/pull/42533
2956 [42571]: https://github.com/rust-lang/rust/pull/42571
2957 [42613]: https://github.com/rust-lang/rust/pull/42613
2958 [42799]: https://github.com/rust-lang/rust/pull/42799
2959 [42807]: https://github.com/rust-lang/rust/pull/42807
2960 [42809]: https://github.com/rust-lang/rust/pull/42809
2961 [42822]: https://github.com/rust-lang/rust/pull/42822
2962 [42826]: https://github.com/rust-lang/rust/pull/42826
2963 [42854]: https://github.com/rust-lang/rust/pull/42854
2964 [42913]: https://github.com/rust-lang/rust/pull/42913
2965 [42999]: https://github.com/rust-lang/rust/pull/42999
2966 [43011]: https://github.com/rust-lang/rust/pull/43011
2967 [43015]: https://github.com/rust-lang/rust/pull/43015
2968 [43072]: https://github.com/rust-lang/rust/pull/43072
2969 [43077]: https://github.com/rust-lang/rust/pull/43077
2970 [43097]: https://github.com/rust-lang/rust/pull/43097
2971 [43099]: https://github.com/rust-lang/rust/pull/43099
2972 [43170]: https://github.com/rust-lang/rust/pull/43170
2973 [43178]: https://github.com/rust-lang/rust/pull/43178
2974 [43185]: https://github.com/rust-lang/rust/pull/43185
2975 [43228]: https://github.com/rust-lang/rust/pull/43228
2976 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
2977 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
2978 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
2979 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
2980 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
2981 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2982 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
2983 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
2984 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
2985 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
2986 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
2987 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
2988 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
2989 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
2990 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
2991 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
2992 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
2993 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
2994 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
2995 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
2996 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
2997 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
2998 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
2999 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3000 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3001 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3002 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3003 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3004 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3005 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3006 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3007 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3008 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3009 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3010 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3011 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3012 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3013 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3014 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3017 Version 1.19.0 (2017-07-20)
3018 ===========================
3023 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3024 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3025 - [Macro recursion limit increased to 1024 from 64.][41676]
3026 - [Added lint for detecting unused macros.][41907]
3027 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3028 For example: `let x = loop { break 7; };`
3029 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3030 contain `Copy` types and cannot have a `Drop` implementation.
3031 Example: `union Foo { bar: u8, baz: usize }`
3032 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3033 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3038 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3039 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3040 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3041 you should use `--target armv7-linux-androideabi`.
3042 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3043 - [Minor optimisation of string operations.][42037]
3044 - [Compiler error message is now `aborting due to previous error(s)` instead of
3045 `aborting due to N previous errors`][42150] This was previously inaccurate and
3046 would only count certain kinds of errors.
3047 - [The compiler now supports Visual Studio 2017][42225]
3048 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3049 - [Added a lot][42264] of [new error codes][42302]
3050 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3051 libraries with C Run-time Libraries(CRT) to be statically linked.
3052 - [Fixed various ARM codegen bugs][42740]
3057 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3058 `Extend<Cow<'a, str>>`][41449]
3059 - [`Vec` now implements `From<&mut [T]>`][41530]
3060 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3061 - [`SplitWhitespace` now implements `Clone`][41659]
3062 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3064 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3065 macros, but for printing to stderr.
3070 - [`OsString::shrink_to_fit`]
3073 - [`thread::ThreadId`]
3078 - [Build scripts can now add environment variables to the environment
3079 the crate is being compiled in.
3080 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3081 - [Subcommands now replace the current process rather than spawning a new
3082 child process][cargo/3970]
3083 - [Workspace members can now accept glob file patterns][cargo/3979]
3084 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3085 the members in a given workspace.][cargo/3988]
3086 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3087 - [Target directory path is now in the cargo metadata][cargo/4022]
3088 - [Cargo no longer checks out a local working directory for the
3089 crates.io index][cargo/4026] This should provide smaller file size for the
3090 registry, and improve cloning times, especially on Windows machines.
3091 - [Added an `--exclude` option for excluding certain packages when using the
3092 `--all` option][cargo/4031]
3093 - [Cargo will now automatically retry when receiving a 5xx error
3094 from crates.io][cargo/4032]
3095 - [The `--features` option now accepts multiple comma or space
3096 delimited values.][cargo/4084]
3097 - [Added support for custom target specific runners][cargo/3954]
3102 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3104 - [Rust will now release XZ compressed packages][rust-installer/57]
3105 - [rustup will now prefer to download rust packages with
3106 XZ compression][rustup/1100] over GZip packages.
3107 - [Added the ability to escape `#` in rust documentation][41785] By adding
3108 additional `#`'s ie. `##` is now `#`
3113 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3114 - [`-Z` flags are now no longer allowed to be used on the stable
3115 compiler.][41751] This has been a warning for a year previous to this.
3116 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3117 longer works][42844]. Users should migrate to the built-in `check`
3118 command, which has been available since 1.16.
3119 - [Ending a float literal with `._` is now a hard error.
3120 Example: `42._` .][41946]
3121 - [Any use of a private `extern crate` outside of its module is now a
3122 hard error.][36886] This was previously a warning.
3123 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3124 relative while the `::` prefix makes a path absolute, but was ignored and the
3125 path was relative regardless.
3126 - [Floating point constants in match patterns is now a hard error][36890]
3127 This was previously a warning.
3128 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3129 match patterns is now a hard error][36891] This was previously a warning.
3130 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3132 - [From the pound escape, lines consisting of multiple `#`s are
3134 - [It is an error to re-export private enum variants][42460]. This is
3135 known to break a number of crates that depend on an older version of
3137 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3138 to use it to find the linker, and the build will fail where it did
3139 not previously][42607]
3141 [36886]: https://github.com/rust-lang/rust/issues/36886
3142 [36888]: https://github.com/rust-lang/rust/issues/36888
3143 [36890]: https://github.com/rust-lang/rust/issues/36890
3144 [36891]: https://github.com/rust-lang/rust/issues/36891
3145 [36892]: https://github.com/rust-lang/rust/issues/36892
3146 [37406]: https://github.com/rust-lang/rust/issues/37406
3147 [39983]: https://github.com/rust-lang/rust/pull/39983
3148 [41145]: https://github.com/rust-lang/rust/pull/41145
3149 [41192]: https://github.com/rust-lang/rust/pull/41192
3150 [41258]: https://github.com/rust-lang/rust/pull/41258
3151 [41370]: https://github.com/rust-lang/rust/pull/41370
3152 [41449]: https://github.com/rust-lang/rust/pull/41449
3153 [41530]: https://github.com/rust-lang/rust/pull/41530
3154 [41624]: https://github.com/rust-lang/rust/pull/41624
3155 [41656]: https://github.com/rust-lang/rust/pull/41656
3156 [41659]: https://github.com/rust-lang/rust/pull/41659
3157 [41676]: https://github.com/rust-lang/rust/pull/41676
3158 [41751]: https://github.com/rust-lang/rust/pull/41751
3159 [41764]: https://github.com/rust-lang/rust/pull/41764
3160 [41785]: https://github.com/rust-lang/rust/pull/41785
3161 [41873]: https://github.com/rust-lang/rust/pull/41873
3162 [41907]: https://github.com/rust-lang/rust/pull/41907
3163 [41946]: https://github.com/rust-lang/rust/pull/41946
3164 [42016]: https://github.com/rust-lang/rust/pull/42016
3165 [42037]: https://github.com/rust-lang/rust/pull/42037
3166 [42068]: https://github.com/rust-lang/rust/pull/42068
3167 [42150]: https://github.com/rust-lang/rust/pull/42150
3168 [42162]: https://github.com/rust-lang/rust/pull/42162
3169 [42225]: https://github.com/rust-lang/rust/pull/42225
3170 [42264]: https://github.com/rust-lang/rust/pull/42264
3171 [42302]: https://github.com/rust-lang/rust/pull/42302
3172 [42460]: https://github.com/rust-lang/rust/issues/42460
3173 [42607]: https://github.com/rust-lang/rust/issues/42607
3174 [42740]: https://github.com/rust-lang/rust/pull/42740
3175 [42844]: https://github.com/rust-lang/rust/issues/42844
3176 [42948]: https://github.com/rust-lang/rust/pull/42948
3177 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3178 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3179 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3180 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3181 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3182 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3183 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3184 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3185 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3186 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3187 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3188 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3189 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3190 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3191 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3192 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3193 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3194 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3195 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3196 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3197 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3198 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3201 Version 1.18.0 (2017-06-08)
3202 ===========================
3207 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3208 make the item visible to just that module tree. Also accepts the keyword
3209 `crate` to make something public to the whole crate but not users of the
3210 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3211 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3212 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3213 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3214 types like `Write + Send`, trailing `+` are now supported in trait objects,
3215 and better error reporting for trait objects starting with `?Sized`.
3216 - [0e+10 is now a valid floating point literal][40589]
3217 - [Now warns if you bind a lifetime parameter to 'static][40734]
3218 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3219 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3220 representation in some cases.][40377]
3225 - [rustc can now emit mir with `--emit mir`][39891]
3226 - [Improved LLVM IR for trivial functions][40367]
3227 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3228 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3229 opportunities found through profiling
3230 - [Improved backtrace formatting when panicking][38165]
3235 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3236 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3237 iteration or reallocation.
3238 - [Simplified HashMap Bucket interface][40561] provides performance
3239 improvements for iterating and cloning.
3240 - [Specialize Vec::from_elem to use calloc][40409]
3241 - [Fixed Race condition in fs::create_dir_all][39799]
3242 - [No longer caching stdio on Windows][40516]
3243 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3244 2.50%~ faster and in one case now 12.50% faster.
3245 - [Optimized `AtomicBool::fetch_nand`][41143]
3250 - [`Child::try_wait`]
3251 - [`HashMap::retain`]
3252 - [`HashSet::retain`]
3254 - [`TcpStream::peek`]
3255 - [`UdpSocket::peek`]
3256 - [`UdpSocket::peek_from`]
3261 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3262 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3263 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3264 - [Added Android build support][cargo/3885]
3265 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3266 of a certain type, for example `cargo build --bins` will build all
3268 - [Added support for haiku][cargo/3952]
3273 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3274 - [Added rust-windbg script for better debugging on Windows][39983]
3275 - [Rust now uses the official cross compiler for NetBSD][40612]
3276 - [rustdoc now accepts `#` at the start of files][40828]
3277 - [Fixed jemalloc support for musl][41168]
3282 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3283 always placed after the sign if it exists and before the digits. With the `#`
3284 flag the zeroes are placed after the prefix and before the digits.
3285 - [Due to the struct field optimisation][40377], using `transmute` on structs
3286 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3287 always been undefined behavior, but is now more likely to break in practice.
3288 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3289 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3290 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3291 - [Overlapping inherent `impl`s are now a hard error][40728]
3292 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3293 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3294 `out.asm` and `out.ll` instead of only one of the filetypes.
3295 - [ calling a function that returns `Self` will no longer work][41805] when
3296 the size of `Self` cannot be statically determined.
3297 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3298 this has caused a few regressions namely:
3300 - Changed the link order of local static/dynamic libraries (respecting the
3301 order on given rather than having the compiler reorder).
3302 - Changed how MinGW is linked, native code linked to dynamic libraries
3303 may require manually linking to the gcc support library (for the native
3306 [38165]: https://github.com/rust-lang/rust/pull/38165
3307 [39799]: https://github.com/rust-lang/rust/pull/39799
3308 [39891]: https://github.com/rust-lang/rust/pull/39891
3309 [39983]: https://github.com/rust-lang/rust/pull/39983
3310 [40043]: https://github.com/rust-lang/rust/pull/40043
3311 [40241]: https://github.com/rust-lang/rust/pull/40241
3312 [40338]: https://github.com/rust-lang/rust/pull/40338
3313 [40367]: https://github.com/rust-lang/rust/pull/40367
3314 [40377]: https://github.com/rust-lang/rust/pull/40377
3315 [40409]: https://github.com/rust-lang/rust/pull/40409
3316 [40516]: https://github.com/rust-lang/rust/pull/40516
3317 [40556]: https://github.com/rust-lang/rust/pull/40556
3318 [40561]: https://github.com/rust-lang/rust/pull/40561
3319 [40589]: https://github.com/rust-lang/rust/pull/40589
3320 [40612]: https://github.com/rust-lang/rust/pull/40612
3321 [40723]: https://github.com/rust-lang/rust/pull/40723
3322 [40728]: https://github.com/rust-lang/rust/pull/40728
3323 [40731]: https://github.com/rust-lang/rust/pull/40731
3324 [40734]: https://github.com/rust-lang/rust/pull/40734
3325 [40805]: https://github.com/rust-lang/rust/pull/40805
3326 [40807]: https://github.com/rust-lang/rust/pull/40807
3327 [40828]: https://github.com/rust-lang/rust/pull/40828
3328 [40870]: https://github.com/rust-lang/rust/pull/40870
3329 [41085]: https://github.com/rust-lang/rust/pull/41085
3330 [41143]: https://github.com/rust-lang/rust/pull/41143
3331 [41168]: https://github.com/rust-lang/rust/pull/41168
3332 [41270]: https://github.com/rust-lang/rust/issues/41270
3333 [41469]: https://github.com/rust-lang/rust/pull/41469
3334 [41805]: https://github.com/rust-lang/rust/issues/41805
3335 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3336 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3337 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3338 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3339 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3340 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3341 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3342 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3343 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3344 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3345 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3346 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3347 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3348 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3351 Version 1.17.0 (2017-04-27)
3352 ===========================
3357 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3358 * [Fields of structs may be initialized without duplicating the field/variable
3359 names][39761]. [RFC 1682]
3360 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3361 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3362 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3363 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3364 `'b`. Soundness fix.
3365 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3366 * [Static variables may contain references to other statics][40027]
3371 * [Exit quickly on only `--emit dep-info`][40336]
3372 * [Make `-C relocation-model` more correctly determine whether the linker
3373 creates a position-independent executable][40245]
3374 * [Add `-C overflow-checks` to directly control whether integer overflow
3376 * [The rustc type checker now checks items on demand instead of in a single
3377 in-order pass][40008]. This is mostly an internal refactoring in support of
3378 future work, including incremental type checking, but also resolves [RFC
3379 1647], allowing `Self` to appear in `impl` `where` clauses.
3380 * [Optimize vtable loads][39995]
3381 * [Turn off vectorization for Emscripten targets][39990]
3382 * [Provide suggestions for unknown macros imported with `use`][39953]
3383 * [Fix ICEs in path resolution][39939]
3384 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3385 * [Add clearer error message using `&str + &str`][39116]
3396 * [`Ordering::then`]
3397 * [`Ordering::then_with`]
3398 * [`BTreeMap::range`]
3399 * [`BTreeMap::range_mut`]
3400 * [`collections::Bound`]
3401 * [`process::abort`]
3402 * [`ptr::read_unaligned`]
3403 * [`ptr::write_unaligned`]
3404 * [`Result::expect_err`]
3407 * [`Cell::into_inner`]
3413 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
3414 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
3415 * [`String` implements `FromIterator<&char>`][40028]
3416 * `Box` [implements][40009] a number of new conversions:
3417 `From<Box<str>> for String`,
3418 `From<Box<[T]>> for Vec<T>`,
3419 `From<Box<CStr>> for CString`,
3420 `From<Box<OsStr>> for OsString`,
3421 `From<Box<Path>> for PathBuf`,
3422 `Into<Box<str>> for String`,
3423 `Into<Box<[T]>> for Vec<T>`,
3424 `Into<Box<CStr>> for CString`,
3425 `Into<Box<OsStr>> for OsString`,
3426 `Into<Box<Path>> for PathBuf`,
3427 `Default for Box<str>`,
3428 `Default for Box<CStr>`,
3429 `Default for Box<OsStr>`,
3430 `From<&CStr> for Box<CStr>`,
3431 `From<&OsStr> for Box<OsStr>`,
3432 `From<&Path> for Box<Path>`
3433 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
3434 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
3435 * [Slightly optimize `slice::sort`][39538]
3436 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
3437 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
3438 `Box<str>` implements `From<&str>`][39438]
3439 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
3440 `From<(I, u16)> where I: Into<IpAddr>`][39372]
3441 * [`format!` estimates the needed capacity before writing a string][39356]
3442 * [Support unprivileged symlink creation in Windows][38921]
3443 * [`PathBuf` implements `Default`][38764]
3444 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
3445 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
3446 and poor hash functions.
3451 * [Add `cargo check --all`][cargo/3731]
3452 * [Add an option to ignore SSL revocation checking][cargo/3699]
3453 * [Add `cargo run --package`][cargo/3691]
3454 * [Add `required_features`][cargo/3667]
3455 * [Assume `build.rs` is a build script][cargo/3664]
3456 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
3461 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
3463 * [The "Unstable Book" documents nightly-only features][ubook]
3464 * [Improve the style of the sidebar in rustdoc output][40265]
3465 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
3466 * [Fix MSP430 breakage due to `i128`][40257]
3467 * [Preliminary Solaris/SPARCv9 support][39903]
3468 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
3469 run without installing the MSVC runtime.
3470 * [`rustdoc --test` includes file names in test names][39788]
3471 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
3472 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
3473 * [Initial support for `aarch64-unknown-freebsd`][39491]
3474 * [Initial support for `i686-unknown-netbsd`][39426]
3475 * [This release no longer includes the old makefile build system][39431]. Rust
3476 is built with a custom build system, written in Rust, and with Cargo.
3477 * [Add Debug implementations for libcollection structs][39002]
3478 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
3479 * [`--test-threads=0` produces an error][38945]
3480 * [`rustup` installs documentation by default][40526]
3481 * [The Rust source includes NatVis visualizations][39843]. These can be used by
3482 WinDbg and Visual Studio to improve the debugging experience.
3487 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3488 workaround, either use MSVC 2015 or run vcvars.bat.
3489 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3490 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3491 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3493 * [`format!` and `Display::to_string` panic if an underlying formatting
3494 implementation returns an error][40117]. Previously the error was silently
3495 ignored. It is incorrect for `write_fmt` to return an error when writing
3497 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3498 crates were marked stable and could be accessed from the stable toolchain.
3499 * [Rust git source no longer includes vendored crates][39728]. Those that need
3500 to build with vendored crates should build from release tarballs.
3501 * [Fix inert attributes from `proc_macro_derives`][39572]
3502 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3503 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3505 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3506 existing code generally ignores the type of dead-code unless a type-hint is
3507 provided; this can cause surprising inference interactions particularly around
3508 defaulting. The new code uniformly ignores the result type of dead-code.
3509 * [Tuple-struct constructors with private fields are no longer visible][38932]
3510 * [Lifetime parameters that do not appear in the arguments are now considered
3511 early-bound][38897], resolving a soundness bug (#[32330]). The
3512 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3514 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3515 * [Make transmuting from fn item types to pointer-sized types a hard
3518 [27787]: https://github.com/rust-lang/rust/issues/27787
3519 [32330]: https://github.com/rust-lang/rust/issues/32330
3520 [34198]: https://github.com/rust-lang/rust/pull/34198
3521 [38161]: https://github.com/rust-lang/rust/pull/38161
3522 [38368]: https://github.com/rust-lang/rust/pull/38368
3523 [38584]: https://github.com/rust-lang/rust/issues/38584
3524 [38661]: https://github.com/rust-lang/rust/pull/38661
3525 [38764]: https://github.com/rust-lang/rust/pull/38764
3526 [38864]: https://github.com/rust-lang/rust/issues/38864
3527 [38897]: https://github.com/rust-lang/rust/pull/38897
3528 [38921]: https://github.com/rust-lang/rust/pull/38921
3529 [38932]: https://github.com/rust-lang/rust/pull/38932
3530 [38945]: https://github.com/rust-lang/rust/pull/38945
3531 [38981]: https://github.com/rust-lang/rust/pull/38981
3532 [39002]: https://github.com/rust-lang/rust/pull/39002
3533 [39116]: https://github.com/rust-lang/rust/pull/39116
3534 [39193]: https://github.com/rust-lang/rust/pull/39193
3535 [39265]: https://github.com/rust-lang/rust/pull/39265
3536 [39356]: https://github.com/rust-lang/rust/pull/39356
3537 [39372]: https://github.com/rust-lang/rust/pull/39372
3538 [39426]: https://github.com/rust-lang/rust/pull/39426
3539 [39431]: https://github.com/rust-lang/rust/pull/39431
3540 [39438]: https://github.com/rust-lang/rust/pull/39438
3541 [39440]: https://github.com/rust-lang/rust/pull/39440
3542 [39485]: https://github.com/rust-lang/rust/pull/39485
3543 [39491]: https://github.com/rust-lang/rust/pull/39491
3544 [39518]: https://github.com/rust-lang/rust/pull/39518
3545 [39538]: https://github.com/rust-lang/rust/pull/39538
3546 [39572]: https://github.com/rust-lang/rust/pull/39572
3547 [39633]: https://github.com/rust-lang/rust/pull/39633
3548 [39642]: https://github.com/rust-lang/rust/pull/39642
3549 [39728]: https://github.com/rust-lang/rust/pull/39728
3550 [39761]: https://github.com/rust-lang/rust/pull/39761
3551 [39788]: https://github.com/rust-lang/rust/pull/39788
3552 [39793]: https://github.com/rust-lang/rust/pull/39793
3553 [39837]: https://github.com/rust-lang/rust/pull/39837
3554 [39843]: https://github.com/rust-lang/rust/pull/39843
3555 [39851]: https://github.com/rust-lang/rust/pull/39851
3556 [39903]: https://github.com/rust-lang/rust/pull/39903
3557 [39939]: https://github.com/rust-lang/rust/pull/39939
3558 [39953]: https://github.com/rust-lang/rust/pull/39953
3559 [39960]: https://github.com/rust-lang/rust/pull/39960
3560 [39990]: https://github.com/rust-lang/rust/pull/39990
3561 [39995]: https://github.com/rust-lang/rust/pull/39995
3562 [40008]: https://github.com/rust-lang/rust/pull/40008
3563 [40009]: https://github.com/rust-lang/rust/pull/40009
3564 [40027]: https://github.com/rust-lang/rust/pull/40027
3565 [40028]: https://github.com/rust-lang/rust/pull/40028
3566 [40037]: https://github.com/rust-lang/rust/pull/40037
3567 [40117]: https://github.com/rust-lang/rust/pull/40117
3568 [40166]: https://github.com/rust-lang/rust/pull/40166
3569 [40245]: https://github.com/rust-lang/rust/pull/40245
3570 [40257]: https://github.com/rust-lang/rust/pull/40257
3571 [40261]: https://github.com/rust-lang/rust/pull/40261
3572 [40265]: https://github.com/rust-lang/rust/pull/40265
3573 [40319]: https://github.com/rust-lang/rust/pull/40319
3574 [40336]: https://github.com/rust-lang/rust/pull/40336
3575 [40526]: https://github.com/rust-lang/rust/pull/40526
3576 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3577 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
3578 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
3579 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
3580 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
3581 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
3582 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
3583 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
3584 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
3585 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
3586 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
3587 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
3588 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
3589 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
3590 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
3591 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
3592 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
3593 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
3594 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
3595 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
3596 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
3597 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
3598 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
3599 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
3600 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
3601 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
3602 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
3603 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
3604 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
3605 [mdbook]: https://crates.io/crates/mdbook
3606 [ubook]: https://doc.rust-lang.org/unstable-book/
3609 Version 1.16.0 (2017-03-16)
3610 ===========================
3615 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3616 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3617 match patterns][38069]
3618 * [Clean up semantics of `self` in an import list][38313]
3619 * [`Self` may appear in `impl` headers][38920]
3620 * [`Self` may appear in struct expressions][39282]
3625 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
3626 a `.rmeta` file containing only crate metadata][38571]. This can be
3627 used by tools like the Rust Language Service to perform
3628 metadata-only builds.
3629 * [Levenshtein based typo suggestions now work in most places, while
3630 previously they worked only for fields and sometimes for local
3631 variables][38927]. Together with the overhaul of "no
3632 resolution"/"unexpected resolution" errors (#[38154]) they result in
3633 large and systematic improvement in resolution diagnostics.
3634 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
3636 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
3637 * [`rustc` no longer attempts to provide "consider using an explicit
3638 lifetime" suggestions][37057]. They were inaccurate.
3643 * [`VecDeque::truncate`]
3644 * [`VecDeque::resize`]
3645 * [`String::insert_str`]
3646 * [`Duration::checked_add`]
3647 * [`Duration::checked_sub`]
3648 * [`Duration::checked_div`]
3649 * [`Duration::checked_mul`]
3652 * [`SocketAddr::is_ipv4`]
3653 * [`SocketAddr::is_ipv6`]
3654 * [`IpAddr::is_ipv4`]
3655 * [`IpAddr::is_ipv6`]
3657 * [`Vec::dedup_by_key`]
3658 * [`Result::unwrap_or_default`]
3659 * [`<*const T>::wrapping_offset`]
3660 * [`<*mut T>::wrapping_offset`]
3661 * `CommandExt::creation_flags`
3662 * [`File::set_permissions`]
3663 * [`String::split_off`]
3668 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
3669 their argument by `Borrow` parameter][37761]
3670 * [All public types in std implement `Debug`][38006]
3671 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
3672 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
3673 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3675 * [std: Fix partial writes in `LineWriter`][38062]
3676 * [std: Clamp max read/write sizes on Unix][38062]
3677 * [Use more specific panic message for `&str` slicing errors][38066]
3678 * [`TcpListener::set_only_v6` is deprecated][38304]. This
3679 functionality cannot be achieved in std currently.
3680 * [`writeln!`, like `println!`, now accepts a form with no string
3681 or formatting arguments, to just print a newline][38469]
3682 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
3683 * [Reduce the size of static data in `std_unicode::tables`][38781]
3684 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
3685 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
3687 * [`Duration` implements `Sum`][38712]
3688 * [`String` implements `ToSocketAddrs`][39048]
3693 * [The `cargo check` command does a type check of a project without
3694 building it][cargo/3296]
3695 * [crates.io will display CI badges from Travis and AppVeyor, if
3696 specified in Cargo.toml][cargo/3546]
3697 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
3698 * [Compilation profiles accept integer values for `debug`, in addition
3699 to `true` and `false`. These are passed to `rustc` as the value to
3700 `-C debuginfo`][cargo/3534]
3701 * [Implement `cargo --version --verbose`][cargo/3604]
3702 * [All builds now output 'dep-info' build dependencies compatible with
3703 make and ninja][cargo/3557]
3704 * [Build all workspace members with `build --all`][cargo/3511]
3705 * [Document all workspace members with `doc --all`][cargo/3515]
3706 * [Path deps outside workspace are not members][cargo/3443]
3711 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
3712 the path to the Rust implementation][38589]
3713 * [The `armv7-linux-androideabi` target no longer enables NEON
3714 extensions, per Google's ABI guide][38413]
3715 * [The stock standard library can be compiled for Redox OS][38401]
3716 * [Rust has initial SPARC support][38726]. Tier 3. No builds
3718 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
3720 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
3725 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3726 match patterns][38069]
3727 * In this release, references to uninhabited types can not be
3728 pattern-matched. This was accidentally allowed in 1.15.
3729 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3730 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3732 * [Clean up semantics of `self` in an import list][38313]
3733 * Reimplemented lifetime elision. This change was almost entirely compatible
3734 with existing code, but it did close a number of small bugs and loopholes,
3735 as well as being more accepting in some other [cases][41105].
3737 [37057]: https://github.com/rust-lang/rust/pull/37057
3738 [37761]: https://github.com/rust-lang/rust/pull/37761
3739 [38006]: https://github.com/rust-lang/rust/pull/38006
3740 [38051]: https://github.com/rust-lang/rust/pull/38051
3741 [38062]: https://github.com/rust-lang/rust/pull/38062
3742 [38062]: https://github.com/rust-lang/rust/pull/38622
3743 [38066]: https://github.com/rust-lang/rust/pull/38066
3744 [38069]: https://github.com/rust-lang/rust/pull/38069
3745 [38131]: https://github.com/rust-lang/rust/pull/38131
3746 [38154]: https://github.com/rust-lang/rust/pull/38154
3747 [38274]: https://github.com/rust-lang/rust/pull/38274
3748 [38304]: https://github.com/rust-lang/rust/pull/38304
3749 [38313]: https://github.com/rust-lang/rust/pull/38313
3750 [38314]: https://github.com/rust-lang/rust/pull/38314
3751 [38327]: https://github.com/rust-lang/rust/pull/38327
3752 [38401]: https://github.com/rust-lang/rust/pull/38401
3753 [38413]: https://github.com/rust-lang/rust/pull/38413
3754 [38469]: https://github.com/rust-lang/rust/pull/38469
3755 [38559]: https://github.com/rust-lang/rust/pull/38559
3756 [38571]: https://github.com/rust-lang/rust/pull/38571
3757 [38580]: https://github.com/rust-lang/rust/pull/38580
3758 [38589]: https://github.com/rust-lang/rust/pull/38589
3759 [38670]: https://github.com/rust-lang/rust/pull/38670
3760 [38712]: https://github.com/rust-lang/rust/pull/38712
3761 [38726]: https://github.com/rust-lang/rust/pull/38726
3762 [38781]: https://github.com/rust-lang/rust/pull/38781
3763 [38798]: https://github.com/rust-lang/rust/pull/38798
3764 [38909]: https://github.com/rust-lang/rust/pull/38909
3765 [38920]: https://github.com/rust-lang/rust/pull/38920
3766 [38927]: https://github.com/rust-lang/rust/pull/38927
3767 [39048]: https://github.com/rust-lang/rust/pull/39048
3768 [39282]: https://github.com/rust-lang/rust/pull/39282
3769 [39379]: https://github.com/rust-lang/rust/pull/39379
3770 [41105]: https://github.com/rust-lang/rust/issues/41105
3771 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3772 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3773 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
3774 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
3775 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
3776 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
3777 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
3778 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
3779 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
3780 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
3781 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
3782 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
3783 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
3784 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
3785 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
3786 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
3787 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
3788 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
3789 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
3790 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
3791 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
3792 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
3793 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
3794 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
3795 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
3796 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
3797 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
3798 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
3799 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
3800 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3803 Version 1.15.1 (2017-02-09)
3804 ===========================
3806 * [Fix IntoIter::as_mut_slice's signature][39466]
3807 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
3809 [39466]: https://github.com/rust-lang/rust/pull/39466
3810 [39523]: https://github.com/rust-lang/rust/pull/39523
3813 Version 1.15.0 (2017-02-02)
3814 ===========================
3819 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
3820 stable. This allows popular code-generating crates like Serde and Diesel to
3821 work ergonomically. [RFC 1681].
3822 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
3823 with curly braces][36868]. Part of [RFC 1506].
3824 * [A number of minor changes to name resolution have been activated][37127].
3825 They add up to more consistent semantics, allowing for future evolution of
3826 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3827 details of what is different. The breaking changes here have been transitioned
3828 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3829 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
3831 * [`?Sized` can be used in `where` clauses][37791]
3832 * [There is now a limit on the size of monomorphized types and it can be
3833 modified with the `#![type_size_limit]` crate attribute, similarly to
3834 the `#![recursion_limit]` attribute][37789]
3839 * [On Windows, the compiler will apply dllimport attributes when linking to
3840 extern functions][37973]. Additional attributes and flags can control which
3841 library kind is linked and its name. [RFC 1717].
3842 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3843 * [The `--test` flag works with procedural macro crates][38107]
3844 * [Fix `extern "aapcs" fn` ABI][37814]
3845 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
3846 * [The `format!` expander recognizes incorrect `printf` and shell-style
3847 formatting directives and suggests the correct format][37613].
3848 * [Only report one error for all unused imports in an import list][37456]
3850 Compiler Performance
3851 --------------------
3853 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
3854 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
3855 * [Don't clone in `UnificationTable::probe`][37848]
3856 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
3857 * [Use small vectors in type walker][37760]
3858 * [Macro expansion performance was improved][37701]
3859 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
3860 * [Replace FNV with a faster hash function][37229]
3865 * [`std::iter::Iterator::min_by`]
3866 * [`std::iter::Iterator::max_by`]
3867 * [`std::os::*::fs::FileExt`]
3868 * [`std::sync::atomic::Atomic*::get_mut`]
3869 * [`std::sync::atomic::Atomic*::into_inner`]
3870 * [`std::vec::IntoIter::as_slice`]
3871 * [`std::vec::IntoIter::as_mut_slice`]
3872 * [`std::sync::mpsc::Receiver::try_iter`]
3873 * [`std::os::unix::process::CommandExt::before_exec`]
3874 * [`std::rc::Rc::strong_count`]
3875 * [`std::rc::Rc::weak_count`]
3876 * [`std::sync::Arc::strong_count`]
3877 * [`std::sync::Arc::weak_count`]
3878 * [`std::char::encode_utf8`]
3879 * [`std::char::encode_utf16`]
3880 * [`std::cell::Ref::clone`]
3881 * [`std::io::Take::into_inner`]
3886 * [The standard sorting algorithm has been rewritten for dramatic performance
3887 improvements][38192]. It is a hybrid merge sort, drawing influences from
3888 Timsort. Previously it was a naive merge sort.
3889 * [`Iterator::nth` no longer has a `Sized` bound][38134]
3890 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
3892 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
3893 and `char_indices().last()`][37882]
3894 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
3895 * [Chinese characters display correctly in `fmt::Debug`][37855]
3896 * [Derive `Default` for `Duration`][37699]
3897 * [Support creation of anonymous pipes on WinXP/2k][37677]
3898 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
3899 * [Don't pass overlapped handles to processes][38835]
3904 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3905 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3906 should instead check the variable at runtime with `std::env`. That the value
3907 was set at build time was a bug, and incorrect when cross-compiling. This
3908 change is known to cause breakage.
3909 * [Add `--all` flag to `cargo test`][cargo/3221]
3910 * [Compile statically against the MSVC CRT][cargo/3363]
3911 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
3912 * [Link OpenSSL statically on OSX][cargo/3311]
3913 * [Apply new fingerprinting to build dir outputs][cargo/3310]
3914 * [Test for bad path overrides with summaries][cargo/3336]
3915 * [Require `cargo install --vers` to take a semver version][cargo/3338]
3916 * [Fix retrying crate downloads for network errors][cargo/3348]
3917 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
3918 * [Emit more info on --message-format=json][cargo/3319]
3919 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
3920 * [Don't ignore errors in workspace manifest][cargo/3409]
3921 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
3926 * [Test runners (binaries built with `--test`) now support a `--list` argument
3927 that lists the tests it contains][38185]
3928 * [Test runners now support a `--exact` argument that makes the test filter
3929 match exactly, instead of matching only a substring of the test name][38181]
3930 * [rustdoc supports a `--playground-url` flag][37763]
3931 * [rustdoc provides more details about `#[should_panic]` errors][37749]
3936 * [The Rust build system is now written in Rust][37817]. The Makefiles may
3937 continue to be used in this release by passing `--disable-rustbuild` to the
3938 configure script, but they will be deleted soon. Note that the new build
3939 system uses a different on-disk layout that will likely affect any scripts
3941 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
3943 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
3944 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
3950 * [A number of minor changes to name resolution have been activated][37127].
3951 They add up to more consistent semantics, allowing for future evolution of
3952 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3953 details of what is different. The breaking changes here have been transitioned
3954 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3955 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3956 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3957 should instead check the variable at runtime with `std::env`. That the value
3958 was set at build time was a bug, and incorrect when cross-compiling. This
3959 change is known to cause breakage.
3960 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
3961 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
3962 1.10 and is now an error by default. It will become a hard error in the near
3964 * [The semantics relating modules to file system directories are changing in
3965 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
3966 lint, which is a warning in this release, and will become a hard error in the
3968 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3969 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
3970 the underlying iterator][37834]
3972 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
3973 [33685]: https://github.com/rust-lang/rust/issues/33685
3974 [36868]: https://github.com/rust-lang/rust/pull/36868
3975 [37127]: https://github.com/rust-lang/rust/pull/37127
3976 [37229]: https://github.com/rust-lang/rust/pull/37229
3977 [37456]: https://github.com/rust-lang/rust/pull/37456
3978 [37527]: https://github.com/rust-lang/rust/pull/37527
3979 [37602]: https://github.com/rust-lang/rust/pull/37602
3980 [37613]: https://github.com/rust-lang/rust/pull/37613
3981 [37615]: https://github.com/rust-lang/rust/pull/37615
3982 [37636]: https://github.com/rust-lang/rust/pull/37636
3983 [37627]: https://github.com/rust-lang/rust/pull/37627
3984 [37642]: https://github.com/rust-lang/rust/pull/37642
3985 [37677]: https://github.com/rust-lang/rust/pull/37677
3986 [37699]: https://github.com/rust-lang/rust/pull/37699
3987 [37701]: https://github.com/rust-lang/rust/pull/37701
3988 [37705]: https://github.com/rust-lang/rust/pull/37705
3989 [37749]: https://github.com/rust-lang/rust/pull/37749
3990 [37760]: https://github.com/rust-lang/rust/pull/37760
3991 [37763]: https://github.com/rust-lang/rust/pull/37763
3992 [37764]: https://github.com/rust-lang/rust/pull/37764
3993 [37789]: https://github.com/rust-lang/rust/pull/37789
3994 [37791]: https://github.com/rust-lang/rust/pull/37791
3995 [37814]: https://github.com/rust-lang/rust/pull/37814
3996 [37817]: https://github.com/rust-lang/rust/pull/37817
3997 [37834]: https://github.com/rust-lang/rust/pull/37834
3998 [37848]: https://github.com/rust-lang/rust/pull/37848
3999 [37855]: https://github.com/rust-lang/rust/pull/37855
4000 [37882]: https://github.com/rust-lang/rust/pull/37882
4001 [37888]: https://github.com/rust-lang/rust/pull/37888
4002 [37973]: https://github.com/rust-lang/rust/pull/37973
4003 [37979]: https://github.com/rust-lang/rust/pull/37979
4004 [38086]: https://github.com/rust-lang/rust/pull/38086
4005 [38107]: https://github.com/rust-lang/rust/pull/38107
4006 [38117]: https://github.com/rust-lang/rust/pull/38117
4007 [38134]: https://github.com/rust-lang/rust/pull/38134
4008 [38146]: https://github.com/rust-lang/rust/pull/38146
4009 [38181]: https://github.com/rust-lang/rust/pull/38181
4010 [38182]: https://github.com/rust-lang/rust/pull/38182
4011 [38185]: https://github.com/rust-lang/rust/pull/38185
4012 [38192]: https://github.com/rust-lang/rust/pull/38192
4013 [38279]: https://github.com/rust-lang/rust/pull/38279
4014 [38835]: https://github.com/rust-lang/rust/pull/38835
4015 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4016 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4017 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4018 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4019 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4020 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4021 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4022 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4023 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4024 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4025 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4026 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4027 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4028 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4029 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4030 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4031 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4032 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4033 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4034 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4035 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4036 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4037 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4038 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4039 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4040 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4041 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4042 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4043 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4044 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4045 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4046 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4047 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4048 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4049 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4050 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4051 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4052 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4055 Version 1.14.0 (2016-12-22)
4056 ===========================
4061 * [`..` matches multiple tuple fields in enum variants, structs
4062 and tuples][36843]. [RFC 1492].
4063 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4064 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4065 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4066 dereferencing][36822]
4071 * [Mark enums with non-zero discriminant as non-zero][37224]
4072 * [Lower-case `static mut` names are linted like other
4073 statics and consts][37162]
4074 * [Fix ICE on some macros in const integer positions
4075 (e.g. `[u8; m!()]`)][36819]
4076 * [Improve error message and snippet for "did you mean `x`"][36798]
4077 * [Add a panic-strategy field to the target specification][36794]
4078 * [Include LLVM version in `--version --verbose`][37200]
4080 Compile-time Optimizations
4081 --------------------------
4083 * [Improve macro expansion performance][37569]
4084 * [Shrink `Expr_::ExprInlineAsm`][37445]
4085 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4086 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4087 * [Avoid more allocations when compiling html5ever][37373]
4088 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4089 * [Avoid some allocations in the macro parser][37318]
4090 * [Use a faster deflate setting][37298]
4091 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4092 during interning of slices][37270]
4093 * [Optimize `write_metadata`][37267]
4094 * [Don't process obligation forest cycles when stalled][37231]
4095 * [Avoid many `CrateConfig` clones][37161]
4096 * [Optimize `Substs::super_fold_with`][37108]
4097 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4098 * [Speed up `plug_leaks`][36917]
4103 * [`println!()`, with no arguments, prints newline][36825].
4104 Previously, an empty string was required to achieve the same.
4105 * [`Wrapping` impls standard binary and unary operators, as well as
4106 the `Sum` and `Product` iterators][37356]
4107 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4109 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4110 `VecDeque` iterators][37315]
4111 * [Improve `SipHasher` performance on small values][37312]
4112 * [Add Iterator trait TrustedLen to enable better FromIterator /
4114 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4115 * [`ReadDir` implements `Debug`][37221]
4116 * [Implement `RefUnwindSafe` for atomic types][37178]
4117 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4118 * [Avoid allocations in `Decoder::read_str`][37064]
4119 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4120 * [Impl `Debug` for raw pointers to unsized data][36880]
4121 * [Don't reuse `HashMap` random seeds][37470]
4122 * [The internal memory layout of `HashMap` is more cache-friendly, for
4123 significant improvements in some operations][36692]
4124 * [`HashMap` uses less memory on 32-bit architectures][36595]
4125 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4130 * [Expose rustc cfg values to build scripts][cargo/3243]
4131 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4132 * [Fix passing --features when testing multiple packages][cargo/3280]
4133 * [Use a single profile set per workspace][cargo/3249]
4134 * [Load `replace` sections from lock files][cargo/3220]
4135 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4140 * [rustup is the recommended Rust installation method][1.14rustup]
4141 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4142 S390x. These are [tier 2] platforms and may have major defects. Follow the
4143 instructions on the website to install, or add the targets to an existing
4144 installation with `rustup target add`. The new target triples are:
4145 - `mips-unknown-linux-gnu`
4146 - `mipsel-unknown-linux-gnu`
4147 - `mips64-unknown-linux-gnuabi64`
4148 - `mips64el-unknown-linux-gnuabi64 `
4149 - `powerpc-unknown-linux-gnu`
4150 - `powerpc64-unknown-linux-gnu`
4151 - `powerpc64le-unknown-linux-gnu`
4152 - `s390x-unknown-linux-gnu `
4153 * This release includes target (std) builds for ARM Linux running MUSL
4154 libc. These are [tier 2] platforms and may have major defects. Add the
4155 following triples to an existing rustup installation with `rustup target add`:
4156 - `arm-unknown-linux-musleabi`
4157 - `arm-unknown-linux-musleabihf`
4158 - `armv7-unknown-linux-musleabihf`
4159 * This release includes [experimental support for WebAssembly][1.14wasm], via
4160 the `wasm32-unknown-emscripten` target. This target is known to have major
4161 defects. Please test, report, and fix.
4162 * rustup no longer installs documentation by default. Run `rustup
4163 component add rust-docs` to install.
4164 * [Fix line stepping in debugger][37310]
4165 * [Enable line number debuginfo in releases][37280]
4170 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4171 * [Add support for Fuchsia OS][37313]
4172 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4177 * [A number of forward-compatibility lints used by the compiler
4178 to gradually introduce language changes have been converted
4179 to deny by default][36894]:
4180 - ["use of inaccessible extern crate erroneously allowed"][36886]
4181 - ["type parameter default erroneously allowed in invalid location"][36887]
4182 - ["detects super or self keywords at the beginning of global path"][36888]
4183 - ["two overlapping inherent impls define an item with the same name
4184 were erroneously allowed"][36889]
4185 - ["floating-point constants cannot be used in patterns"][36890]
4186 - ["constants of struct or enum type can only be used in a pattern if
4187 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4188 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4189 * [Prohibit patterns in trait methods without bodies][37378]
4190 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4191 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4192 * [The `$crate` macro variable is accepted in fewer locations][37213]
4193 * [Impls specifying extra region requirements beyond the trait
4194 they implement are rejected][37167]
4195 * [Enums may not be unsized][37111]. Unsized enums are intended to
4196 work but never have. For now they are forbidden.
4197 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4199 [tier 2]: https://forge.rust-lang.org/platform-support.html
4200 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4201 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4202 [36430]: https://github.com/rust-lang/rust/pull/36430
4203 [36595]: https://github.com/rust-lang/rust/pull/36595
4204 [36595]: https://github.com/rust-lang/rust/pull/36595
4205 [36692]: https://github.com/rust-lang/rust/pull/36692
4206 [36767]: https://github.com/rust-lang/rust/pull/36767
4207 [36794]: https://github.com/rust-lang/rust/pull/36794
4208 [36798]: https://github.com/rust-lang/rust/pull/36798
4209 [36819]: https://github.com/rust-lang/rust/pull/36819
4210 [36822]: https://github.com/rust-lang/rust/pull/36822
4211 [36825]: https://github.com/rust-lang/rust/pull/36825
4212 [36843]: https://github.com/rust-lang/rust/pull/36843
4213 [36880]: https://github.com/rust-lang/rust/pull/36880
4214 [36886]: https://github.com/rust-lang/rust/issues/36886
4215 [36887]: https://github.com/rust-lang/rust/issues/36887
4216 [36888]: https://github.com/rust-lang/rust/issues/36888
4217 [36889]: https://github.com/rust-lang/rust/issues/36889
4218 [36890]: https://github.com/rust-lang/rust/issues/36890
4219 [36891]: https://github.com/rust-lang/rust/issues/36891
4220 [36892]: https://github.com/rust-lang/rust/issues/36892
4221 [36894]: https://github.com/rust-lang/rust/pull/36894
4222 [36917]: https://github.com/rust-lang/rust/pull/36917
4223 [36993]: https://github.com/rust-lang/rust/pull/36993
4224 [37037]: https://github.com/rust-lang/rust/pull/37037
4225 [37064]: https://github.com/rust-lang/rust/pull/37064
4226 [37094]: https://github.com/rust-lang/rust/pull/37094
4227 [37108]: https://github.com/rust-lang/rust/pull/37108
4228 [37111]: https://github.com/rust-lang/rust/pull/37111
4229 [37161]: https://github.com/rust-lang/rust/pull/37161
4230 [37162]: https://github.com/rust-lang/rust/pull/37162
4231 [37167]: https://github.com/rust-lang/rust/pull/37167
4232 [37178]: https://github.com/rust-lang/rust/pull/37178
4233 [37200]: https://github.com/rust-lang/rust/pull/37200
4234 [37213]: https://github.com/rust-lang/rust/pull/37213
4235 [37221]: https://github.com/rust-lang/rust/pull/37221
4236 [37224]: https://github.com/rust-lang/rust/pull/37224
4237 [37230]: https://github.com/rust-lang/rust/pull/37230
4238 [37231]: https://github.com/rust-lang/rust/pull/37231
4239 [37247]: https://github.com/rust-lang/rust/pull/37247
4240 [37267]: https://github.com/rust-lang/rust/pull/37267
4241 [37270]: https://github.com/rust-lang/rust/pull/37270
4242 [37273]: https://github.com/rust-lang/rust/pull/37273
4243 [37280]: https://github.com/rust-lang/rust/pull/37280
4244 [37298]: https://github.com/rust-lang/rust/pull/37298
4245 [37306]: https://github.com/rust-lang/rust/pull/37306
4246 [37310]: https://github.com/rust-lang/rust/pull/37310
4247 [37312]: https://github.com/rust-lang/rust/pull/37312
4248 [37313]: https://github.com/rust-lang/rust/pull/37313
4249 [37315]: https://github.com/rust-lang/rust/pull/37315
4250 [37318]: https://github.com/rust-lang/rust/pull/37318
4251 [37322]: https://github.com/rust-lang/rust/pull/37322
4252 [37326]: https://github.com/rust-lang/rust/pull/37326
4253 [37351]: https://github.com/rust-lang/rust/pull/37351
4254 [37356]: https://github.com/rust-lang/rust/pull/37356
4255 [37367]: https://github.com/rust-lang/rust/pull/37367
4256 [37373]: https://github.com/rust-lang/rust/pull/37373
4257 [37378]: https://github.com/rust-lang/rust/pull/37378
4258 [37389]: https://github.com/rust-lang/rust/pull/37389
4259 [37392]: https://github.com/rust-lang/rust/pull/37392
4260 [37427]: https://github.com/rust-lang/rust/pull/37427
4261 [37439]: https://github.com/rust-lang/rust/pull/37439
4262 [37445]: https://github.com/rust-lang/rust/pull/37445
4263 [37470]: https://github.com/rust-lang/rust/pull/37470
4264 [37569]: https://github.com/rust-lang/rust/pull/37569
4265 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4266 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4267 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4268 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4269 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4270 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4271 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4274 Version 1.13.0 (2016-11-10)
4275 ===========================
4280 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4281 errors, like the `try!` macro, described in [RFC 0243].
4282 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4283 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4284 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4285 * [Fix lifetime rules for 'if' conditions][36029]
4286 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4291 * [Add the `-C link-arg` argument][36574]
4292 * [Remove the old AST-based backend from rustc_trans][35764]
4293 * [Don't enable NEON by default on armv7 Linux][35814]
4294 * [Fix debug line number info for macro expansions][35238]
4295 * [Do not emit "class method" debuginfo for types that are not
4296 DICompositeType][36008]
4297 * [Warn about multiple conflicting #[repr] hints][34623]
4298 * [When sizing DST, don't double-count nested struct prefixes][36351]
4299 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4300 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4301 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4302 * [Expand macros without recursing to avoid stack overflows][36214]
4307 * [Replace macro backtraces with labeled local uses][35702]
4308 * [Improve error message for misplaced doc comments][33922]
4309 * [Buffer unix and lock windows to prevent message interleaving][35975]
4310 * [Update lifetime errors to specifically note temporaries][36171]
4311 * [Special case a few colors for Windows][36178]
4312 * [Suggest `use self` when such an import resolves][36289]
4313 * [Be more specific when type parameter shadows primitive type][36338]
4314 * Many minor improvements
4316 Compile-time Optimizations
4317 --------------------------
4319 * [Compute and cache HIR hashes at beginning][35854]
4320 * [Don't hash types in loan paths][36004]
4321 * [Cache projections in trans][35761]
4322 * [Optimize the parser's last token handling][36527]
4323 * [Only instantiate #[inline] functions in codegen units referencing
4324 them][36524]. This leads to big improvements in cases where crates export
4325 define many inline functions without using them directly.
4326 * [Lazily allocate TypedArena's first chunk][36592]
4327 * [Don't allocate during default HashSet creation][36734]
4334 * [`overflowing_abs`]
4335 * [`RefCell::try_borrow`]
4336 * [`RefCell::try_borrow_mut`]
4341 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4342 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4344 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4345 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4346 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4347 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4348 * [Use arc4rand on FreeBSD][35884]
4349 * [memrchr: Correct aligned offset computation][35969]
4350 * [Improve Demangling of Rust Symbols][36059]
4351 * [Use monotonic time in condition variables][35048]
4352 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4353 * [Implement conversion traits for `char`][35755]
4354 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4355 * [Zero first byte of CString on drop][36264]
4356 * [Inherit overflow checks for sum and product][36372]
4357 * [Add missing Eq implementations][36423]
4358 * [Implement `Debug` for `DirEntry`][36631]
4359 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4361 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4362 * [Implement more traits for `std::io::ErrorKind`][35911]
4363 * [Optimize BinaryHeap bounds checking][36072]
4364 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4365 `extend_with_element`][36355]
4366 * [Fix overflow checking in unsigned pow()][34942]
4371 * This release includes security fixes to both curl and OpenSSL.
4372 * [Fix transitive doctests when panic=abort][cargo/3021]
4373 * [Add --all-features flag to cargo][cargo/3038]
4374 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4375 * [Don't parse the home directory more than once][cargo/3078]
4376 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4377 * [Update OpenSSL to 1.0.2j][cargo/3121]
4378 * [Add license and license_file to cargo metadata output][cargo/3110]
4379 * [Make crates-io registry URL optional in config; ignore all changes to
4380 source.crates-io][cargo/3089]
4381 * [Don't download dependencies from other platforms][cargo/3123]
4382 * [Build transitive dev-dependencies when needed][cargo/3125]
4383 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4384 * [Avoid updating registry when adding existing deps][cargo/3144]
4385 * [Warn about path overrides that won't work][cargo/3136]
4386 * [Use workspaces during `cargo install`][cargo/3146]
4387 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4388 * [Add --message-format flag][cargo/3000]
4389 * [Pass target environment for rustdoc][cargo/3205]
4390 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4391 * [Update curl and curl-sys][cargo/3241]
4392 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4397 * [rustdoc: Add the `--sysroot` argument][36586]
4398 * [rustdoc: Fix a couple of issues with the search results][35655]
4399 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4400 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4401 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4406 * [Remove unmaintained style guide][35124]
4407 * [Add s390x support][36369]
4408 * [Initial work at Haiku OS support][36727]
4409 * [Add mips-uclibc targets][35734]
4410 * [Crate-ify compiler-rt into compiler-builtins][35021]
4411 * [Add rustc version info (git hash + date) to dist tarball][36213]
4412 * Many documentation improvements
4417 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4418 * [Deny (by default) transmuting from fn item types to pointer-sized
4419 types][34923]. Continuing the long transition to zero-sized fn items,
4421 * [Fix `#[derive]` for empty tuple structs/variants][35728].
4423 * [Issue deprecation warnings for safe accesses to extern statics][36173]
4424 * [Fix lifetime rules for 'if' conditions][36029].
4425 * [Inherit overflow checks for sum and product][36372].
4426 * [Forbid user-defined macros named "macro_rules"][36730].
4428 [33922]: https://github.com/rust-lang/rust/pull/33922
4429 [34623]: https://github.com/rust-lang/rust/pull/34623
4430 [34923]: https://github.com/rust-lang/rust/pull/34923
4431 [34942]: https://github.com/rust-lang/rust/pull/34942
4432 [34982]: https://github.com/rust-lang/rust/pull/34982
4433 [35021]: https://github.com/rust-lang/rust/pull/35021
4434 [35048]: https://github.com/rust-lang/rust/pull/35048
4435 [35074]: https://github.com/rust-lang/rust/pull/35074
4436 [35124]: https://github.com/rust-lang/rust/pull/35124
4437 [35234]: https://github.com/rust-lang/rust/pull/35234
4438 [35238]: https://github.com/rust-lang/rust/pull/35238
4439 [35354]: https://github.com/rust-lang/rust/pull/35354
4440 [35559]: https://github.com/rust-lang/rust/pull/35559
4441 [35585]: https://github.com/rust-lang/rust/pull/35585
4442 [35627]: https://github.com/rust-lang/rust/pull/35627
4443 [35655]: https://github.com/rust-lang/rust/pull/35655
4444 [35702]: https://github.com/rust-lang/rust/pull/35702
4445 [35707]: https://github.com/rust-lang/rust/pull/35707
4446 [35728]: https://github.com/rust-lang/rust/pull/35728
4447 [35734]: https://github.com/rust-lang/rust/pull/35734
4448 [35755]: https://github.com/rust-lang/rust/pull/35755
4449 [35761]: https://github.com/rust-lang/rust/pull/35761
4450 [35764]: https://github.com/rust-lang/rust/pull/35764
4451 [35814]: https://github.com/rust-lang/rust/pull/35814
4452 [35854]: https://github.com/rust-lang/rust/pull/35854
4453 [35871]: https://github.com/rust-lang/rust/pull/35871
4454 [35884]: https://github.com/rust-lang/rust/pull/35884
4455 [35911]: https://github.com/rust-lang/rust/pull/35911
4456 [35969]: https://github.com/rust-lang/rust/pull/35969
4457 [35975]: https://github.com/rust-lang/rust/pull/35975
4458 [36004]: https://github.com/rust-lang/rust/pull/36004
4459 [36008]: https://github.com/rust-lang/rust/pull/36008
4460 [36014]: https://github.com/rust-lang/rust/pull/36014
4461 [36029]: https://github.com/rust-lang/rust/pull/36029
4462 [36059]: https://github.com/rust-lang/rust/pull/36059
4463 [36072]: https://github.com/rust-lang/rust/pull/36072
4464 [36101]: https://github.com/rust-lang/rust/pull/36101
4465 [36104]: https://github.com/rust-lang/rust/pull/36104
4466 [36171]: https://github.com/rust-lang/rust/pull/36171
4467 [36173]: https://github.com/rust-lang/rust/pull/36173
4468 [36178]: https://github.com/rust-lang/rust/pull/36178
4469 [36213]: https://github.com/rust-lang/rust/pull/36213
4470 [36214]: https://github.com/rust-lang/rust/pull/36214
4471 [36264]: https://github.com/rust-lang/rust/pull/36264
4472 [36266]: https://github.com/rust-lang/rust/pull/36266
4473 [36289]: https://github.com/rust-lang/rust/pull/36289
4474 [36338]: https://github.com/rust-lang/rust/pull/36338
4475 [36351]: https://github.com/rust-lang/rust/pull/36351
4476 [36355]: https://github.com/rust-lang/rust/pull/36355
4477 [36369]: https://github.com/rust-lang/rust/pull/36369
4478 [36372]: https://github.com/rust-lang/rust/pull/36372
4479 [36423]: https://github.com/rust-lang/rust/pull/36423
4480 [36482]: https://github.com/rust-lang/rust/pull/36482
4481 [36505]: https://github.com/rust-lang/rust/pull/36505
4482 [36524]: https://github.com/rust-lang/rust/pull/36524
4483 [36527]: https://github.com/rust-lang/rust/pull/36527
4484 [36551]: https://github.com/rust-lang/rust/pull/36551
4485 [36574]: https://github.com/rust-lang/rust/pull/36574
4486 [36586]: https://github.com/rust-lang/rust/pull/36586
4487 [36592]: https://github.com/rust-lang/rust/pull/36592
4488 [36631]: https://github.com/rust-lang/rust/pull/36631
4489 [36639]: https://github.com/rust-lang/rust/pull/36639
4490 [36721]: https://github.com/rust-lang/rust/pull/36721
4491 [36727]: https://github.com/rust-lang/rust/pull/36727
4492 [36730]: https://github.com/rust-lang/rust/pull/36730
4493 [36734]: https://github.com/rust-lang/rust/pull/36734
4494 [36754]: https://github.com/rust-lang/rust/pull/36754
4495 [36995]: https://github.com/rust-lang/rust/pull/36995
4496 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4497 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4498 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4499 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4500 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4501 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4502 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4503 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4504 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4505 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4506 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4507 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4508 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4509 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4510 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4511 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4512 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4513 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4514 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4515 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4516 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4517 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4518 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4519 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4520 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4521 [rustup]: https://www.rustup.rs
4522 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4523 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4524 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4525 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4526 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4527 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4528 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4531 Version 1.12.1 (2016-10-20)
4532 ===========================
4537 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4538 * [Confusion with double negation and booleans][36856]
4539 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4540 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4541 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4542 * [Corrupted memory after updated to 1.12][36936]
4543 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4544 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4545 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4547 [36381]: https://github.com/rust-lang/rust/issues/36381
4548 [36856]: https://github.com/rust-lang/rust/issues/36856
4549 [36875]: https://github.com/rust-lang/rust/issues/36875
4550 [36924]: https://github.com/rust-lang/rust/issues/36924
4551 [36926]: https://github.com/rust-lang/rust/issues/36926
4552 [36936]: https://github.com/rust-lang/rust/issues/36936
4553 [37026]: https://github.com/rust-lang/rust/issues/37026
4554 [37112]: https://github.com/rust-lang/rust/issues/37112
4555 [37153]: https://github.com/rust-lang/rust/issues/37153
4558 Version 1.12.0 (2016-09-29)
4559 ===========================
4564 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4565 This translation pass is far simpler than the previous AST->LLVM pass, and
4566 creates opportunities to perform new optimizations directly on the MIR. It
4567 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4568 * [`rustc` presents a new, more readable error format, along with
4569 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4570 Most common editors supporting Rust have been updated to work with it. It was
4571 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4576 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4577 This translation pass is far simpler than the previous AST->LLVM pass, and
4578 creates opportunities to perform new optimizations directly on the MIR. It
4579 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4580 * [Print the Rust target name, not the LLVM target name, with
4581 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
4582 * [The computation of `TypeId` is correct in some cases where it was previously
4583 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
4584 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
4585 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
4586 `--print relocation-models`, and `--print code-models` print the available
4587 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
4588 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
4589 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
4590 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
4591 These targets produce statically-linked binaries. There are no binary release
4597 * [`rustc` presents a new, more readable error format, along with
4598 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4599 Most common editors supporting Rust have been updated to work with it. It was
4600 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4601 * [In error descriptions, references are now described in plain English,
4602 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
4603 * [In error type descriptions, unknown numeric types are named `{integer}` or
4604 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
4605 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
4610 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
4611 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
4612 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
4613 useful](https://github.com/rust-lang/rust/pull/34908)
4614 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
4615 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
4616 * [Semicolons are properly required as statement delimiters inside
4617 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
4618 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4623 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
4624 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
4625 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
4626 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
4627 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
4628 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
4629 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
4630 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
4631 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
4632 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
4633 Both on Unix and Windows.
4634 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
4635 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
4636 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
4637 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
4638 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
4639 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
4640 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
4641 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
4646 * [The `format!` macro and friends now allow a single argument to be formatted
4647 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
4648 * [The lifetime bounds on `[T]::binary_search_by` and
4649 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
4650 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
4651 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
4652 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
4653 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
4654 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
4655 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
4656 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
4657 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
4658 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
4659 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
4660 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
4661 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
4662 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
4663 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
4664 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
4665 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
4666 * [`mpsc::sync_channel` `Receiver`s return any available message before
4667 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
4668 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
4669 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
4674 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
4675 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
4676 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
4677 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
4678 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
4679 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
4680 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
4681 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
4682 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
4683 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
4684 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
4685 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
4686 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
4687 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
4688 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
4689 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
4694 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
4695 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
4700 * [Test binaries now support a `--test-threads` argument to specify the number
4701 of threads used to run tests, and which acts the same as the
4702 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
4703 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
4704 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
4705 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4706 * [Rust releases now come with source packages that can be installed by rustup
4707 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
4708 The resulting source code can be used by tools and IDES, located in the
4709 sysroot under `lib/rustlib/src`.
4714 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
4715 * Many minor improvements to the documentation.
4716 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
4721 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
4722 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
4723 * [When formatting strings, if "precision" is specified, the "fill",
4724 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
4725 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
4728 Version 1.11.0 (2016-08-18)
4729 ===========================
4734 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4735 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
4736 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
4737 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
4738 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
4743 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
4744 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
4745 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
4746 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
4747 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
4748 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
4749 (in libcore - previously stabilized in libstd)
4750 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
4751 (in libcore - previously stabilized in libstd)
4752 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
4753 (in libcore - previously stabilized in libstd)
4754 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
4755 (in libcore - previously stabilized in libstd)
4756 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4757 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4758 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
4759 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
4764 * [The `thread_local!` macro supports multiple definitions in a single
4765 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
4766 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
4767 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
4768 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
4769 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
4770 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
4771 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
4772 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
4777 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
4778 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
4779 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
4780 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
4781 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
4782 and `-vv` prints warnings for all crates.
4783 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
4784 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
4785 This provides room for expansion by arbitrary tools.
4786 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
4787 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
4788 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
4789 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
4790 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
4791 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
4792 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
4797 * [Caching projections speeds up type check dramatically for some
4798 workloads](https://github.com/rust-lang/rust/pull/33816)
4799 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
4800 This hasher is faster, but is believed to provide sufficient
4801 protection from collision attacks.
4802 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
4807 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
4808 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
4809 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
4810 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
4811 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
4816 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
4817 * [When emitting debug info, rustc emits frame pointers for closures,
4818 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
4819 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4820 * Many more errors have been given error codes and extended
4822 * API documentation continues to be improved, with many new examples
4827 * [rustc no longer hangs when dependencies recursively re-export
4828 submodules](https://github.com/rust-lang/rust/pull/34542)
4829 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
4830 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
4831 rewritten](https://github.com/rust-lang/rust/pull/33895)
4832 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
4833 No targets use this yet, but it works toward AVR support.
4838 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
4839 * [The new follow-set rules that place restrictions on `macro_rules!`
4840 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
4841 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
4842 and has been a warning since 1.10.
4843 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
4844 This causes breakage in some corner cases.
4847 Version 1.10.0 (2016-07-07)
4848 ===========================
4853 * [Allow `concat_idents!` in type positions as well as in expression
4854 positions](https://github.com/rust-lang/rust/pull/33735).
4855 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
4856 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
4857 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
4858 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
4859 * [`panic!` can be converted to a runtime abort with the
4860 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
4861 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4862 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
4863 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
4864 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
4865 Note that Cargo does not yet directly support cdylibs.
4870 * `os::windows::fs::OpenOptionsExt::access_mode`
4871 * `os::windows::fs::OpenOptionsExt::share_mode`
4872 * `os::windows::fs::OpenOptionsExt::custom_flags`
4873 * `os::windows::fs::OpenOptionsExt::attributes`
4874 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
4875 * `os::unix::fs::OpenOptionsExt::custom_flags`
4876 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
4877 * `Default for sync::Weak`
4878 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
4879 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
4880 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
4881 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
4882 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
4883 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
4884 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
4885 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
4886 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
4887 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
4888 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
4889 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
4890 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
4891 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
4892 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
4893 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
4894 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
4895 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
4896 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
4897 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
4898 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
4899 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
4900 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
4901 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
4902 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
4903 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4904 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4905 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4906 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4907 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
4908 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
4909 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
4910 * Read/Write/RawFd impls for `UnixStream`
4911 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
4912 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
4913 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
4914 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
4915 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
4916 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
4917 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
4918 * RawFd impls for `UnixListener`
4919 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
4920 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
4921 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
4922 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
4923 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
4924 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
4925 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
4926 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
4927 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
4928 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
4929 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
4930 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
4931 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
4932 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
4933 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
4934 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
4935 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
4936 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
4937 * RawFd impls for `UnixDatagram`
4938 * `{BTree,Hash}Map::values_mut`
4939 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
4944 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
4945 The semantics of this minor method are subtle and probably not what
4947 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
4948 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
4949 will fall back to `/dev/urandom` temporarily to avoid blocking
4950 during early boot](https://github.com/rust-lang/rust/pull/33086).
4951 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
4952 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
4953 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
4954 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
4955 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
4956 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
4957 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
4961 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
4962 This controls the runtime behavior of the `panic!` macro
4963 and can be either "unwind" (the default), or "abort".
4964 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4965 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
4966 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
4967 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
4968 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
4969 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
4970 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
4971 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
4972 By default they are retried twice, which can be customized with the
4973 `net.retry` value in `.cargo/config`.
4974 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
4975 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
4976 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
4977 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
4978 Makes it possible to install multiple crates in parallel.
4979 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
4980 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
4981 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
4982 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
4983 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
4984 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
4989 * [rustc memory usage was reduced by refactoring the context used for
4990 type checking](https://github.com/rust-lang/rust/pull/33425).
4991 * [Speed up creation of `HashMap`s by caching the random keys used
4992 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
4993 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
4994 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
4995 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
4996 10x faster than the previous lookup tables.
4997 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5002 * Many incremental improvements to documentation and rustdoc.
5003 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5004 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5005 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5006 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5007 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5008 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5009 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5014 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5015 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5016 * [`std` no longer prints backtraces on platforms where the running
5017 module must be loaded with `env::current_exe`, which can't be relied
5018 on](https://github.com/rust-lang/rust/pull/33554).
5019 * This release includes std binaries for the i586-unknown-linux-gnu,
5020 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5021 i586 target is for old x86 hardware without SSE2, and the armv7
5022 target is for Android running on modern ARM architectures.
5023 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5024 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5025 * [On Unix the runtime aborts by calling `libc::abort` instead of
5026 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5027 * [Rust is now bootstrapped from the previous release of Rust,
5028 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5033 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5034 * [`target_env` for Linux ARM targets is just `gnu`, not
5035 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5036 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5037 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5038 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5039 Affects how macros are parsed.
5040 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5041 * [Feature-gated attributes on macro-generated macro invocations are
5042 now rejected](https://github.com/rust-lang/rust/pull/32791).
5043 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5044 This caused some minor changes to type inference.
5047 Version 1.9.0 (2016-05-26)
5048 ==========================
5053 * The `#[deprecated]` attribute when applied to an API will generate
5054 warnings when used. The warnings may be suppressed with
5055 `#[allow(deprecated)]`. [RFC 1270].
5056 * [`fn` item types are zero sized, and each `fn` names a unique
5057 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5058 `transmute` on a `fn` type will generate a warning for a few cycles,
5059 then will be converted to an error.
5060 * [Field and method resolution understand visibility, so private
5061 fields and methods cannot prevent the proper use of public fields
5062 and methods][1.9fv].
5063 * [The parser considers unicode codepoints in the
5064 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5070 * [`std::panic::catch_unwind`] (renamed from `recover`)
5071 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5072 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5073 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5074 * [`str::is_char_boundary`]
5075 * [`<*const T>::as_ref`]
5076 * [`<*mut T>::as_ref`]
5077 * [`<*mut T>::as_mut`]
5078 * [`AsciiExt::make_ascii_uppercase`]
5079 * [`AsciiExt::make_ascii_lowercase`]
5080 * [`char::decode_utf16`]
5081 * [`char::DecodeUtf16`]
5082 * [`char::DecodeUtf16Error`]
5083 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5084 * [`BTreeSet::take`]
5085 * [`BTreeSet::replace`]
5088 * [`HashSet::replace`]
5090 * [`OsString::with_capacity`]
5091 * [`OsString::clear`]
5092 * [`OsString::capacity`]
5093 * [`OsString::reserve`]
5094 * [`OsString::reserve_exact`]
5095 * [`OsStr::is_empty`]
5097 * [`std::os::unix::thread`]
5100 * [`JoinHandleExt::as_pthread_t`]
5101 * [`JoinHandleExt::into_pthread_t`]
5102 * [`HashSet::hasher`]
5103 * [`HashMap::hasher`]
5104 * [`CommandExt::exec`]
5105 * [`File::try_clone`]
5106 * [`SocketAddr::set_ip`]
5107 * [`SocketAddr::set_port`]
5108 * [`SocketAddrV4::set_ip`]
5109 * [`SocketAddrV4::set_port`]
5110 * [`SocketAddrV6::set_ip`]
5111 * [`SocketAddrV6::set_port`]
5112 * [`SocketAddrV6::set_flowinfo`]
5113 * [`SocketAddrV6::set_scope_id`]
5114 * [`slice::copy_from_slice`]
5115 * [`ptr::read_volatile`]
5116 * [`ptr::write_volatile`]
5117 * [`OpenOptions::create_new`]
5118 * [`TcpStream::set_nodelay`]
5119 * [`TcpStream::nodelay`]
5120 * [`TcpStream::set_ttl`]
5121 * [`TcpStream::ttl`]
5122 * [`TcpStream::set_only_v6`]
5123 * [`TcpStream::only_v6`]
5124 * [`TcpStream::take_error`]
5125 * [`TcpStream::set_nonblocking`]
5126 * [`TcpListener::set_ttl`]
5127 * [`TcpListener::ttl`]
5128 * [`TcpListener::set_only_v6`]
5129 * [`TcpListener::only_v6`]
5130 * [`TcpListener::take_error`]
5131 * [`TcpListener::set_nonblocking`]
5132 * [`UdpSocket::set_broadcast`]
5133 * [`UdpSocket::broadcast`]
5134 * [`UdpSocket::set_multicast_loop_v4`]
5135 * [`UdpSocket::multicast_loop_v4`]
5136 * [`UdpSocket::set_multicast_ttl_v4`]
5137 * [`UdpSocket::multicast_ttl_v4`]
5138 * [`UdpSocket::set_multicast_loop_v6`]
5139 * [`UdpSocket::multicast_loop_v6`]
5140 * [`UdpSocket::set_multicast_ttl_v6`]
5141 * [`UdpSocket::multicast_ttl_v6`]
5142 * [`UdpSocket::set_ttl`]
5143 * [`UdpSocket::ttl`]
5144 * [`UdpSocket::set_only_v6`]
5145 * [`UdpSocket::only_v6`]
5146 * [`UdpSocket::join_multicast_v4`]
5147 * [`UdpSocket::join_multicast_v6`]
5148 * [`UdpSocket::leave_multicast_v4`]
5149 * [`UdpSocket::leave_multicast_v6`]
5150 * [`UdpSocket::take_error`]
5151 * [`UdpSocket::connect`]
5152 * [`UdpSocket::send`]
5153 * [`UdpSocket::recv`]
5154 * [`UdpSocket::set_nonblocking`]
5159 * [`std::sync::Once` is poisoned if its initialization function
5161 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5162 * [Most types implement `fmt::Debug`][1.9db].
5163 * [The default buffer size used by `BufReader` and `BufWriter` was
5164 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5165 used by other languages.
5166 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5167 `Duration` additionally implements `*=` and `/=`][1.9ta].
5168 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5169 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5170 * [`Chain` implements `BufRead`][1.9ch].
5171 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5176 * [Cargo can now run concurrently][1.9cc].
5177 * [Top-level overrides allow specific revisions of crates to be
5178 overridden through the entire crate graph][1.9ct]. This is intended
5179 to make upgrades easier for large projects, by allowing crates to be
5180 forked temporarily until they've been upgraded and republished.
5181 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5182 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5183 on the commandline][1.9cf]. `rustc` arguments can also be specified
5184 in the `build.rustflags` configuration key.
5189 * [The time complexity of comparing variables for equivalence during type
5190 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5191 to major compilation time improvement in some scenarios.
5192 * [`ToString` is specialized for `str`, giving it the same performance
5193 as `to_owned`][1.9ts].
5194 * [Spawning processes with `Command::output` no longer creates extra
5196 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5197 for C-like enums][1.9cl].
5202 * [Passing the `--quiet` flag to a test runner will produce
5203 much-abbreviated output][1.9q].
5204 * The Rust Project now publishes std binaries for the
5205 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5206 `i586-pc-windows-msvc` targets.
5211 * [`std::sync::Once` is poisoned if its initialization function
5213 * [It is illegal to define methods with the same name in overlapping
5214 inherent `impl` blocks][1.9sn].
5215 * [`fn` item types are zero sized, and each `fn` names a unique
5216 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5217 `transmute` on a `fn` type will generate a warning for a few cycles,
5218 then will be converted to an error.
5219 * [Improvements to const evaluation may trigger new errors when integer
5220 literals are out of range][1.9ce].
5223 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5224 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5225 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5226 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5227 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5228 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5229 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5230 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5231 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5232 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5233 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5234 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5235 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5236 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5237 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5238 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5239 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5240 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5241 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5242 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5243 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5244 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5245 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5246 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5247 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5248 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5249 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5250 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5251 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5252 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5253 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5254 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5255 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5256 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5257 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5258 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5259 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5260 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5261 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5262 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5263 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5264 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5265 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5266 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5267 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5268 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5269 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5270 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5271 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5272 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5273 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5274 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5275 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5276 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5277 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5278 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5279 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5280 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5281 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5282 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5283 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5284 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5285 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5286 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5287 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5288 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5289 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5290 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5291 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5292 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5293 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5294 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5295 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5296 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5297 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5298 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5299 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5300 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5301 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5302 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5303 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5304 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5305 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5306 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5307 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5308 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5309 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5310 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5311 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5312 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5313 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5314 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5315 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5316 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5317 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5318 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5319 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5320 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5321 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5322 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5323 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5324 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5325 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5326 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5327 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5328 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5329 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5330 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5331 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5332 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5335 Version 1.8.0 (2016-04-14)
5336 ==========================
5341 * Rust supports overloading of compound assignment statements like
5342 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5343 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5344 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5346 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5347 addition to the non-braced form, `struct Foo;`. [RFC 218].
5353 * [`str::encode_utf16`] (renamed from `utf16_units`)
5354 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5357 * [`ptr::drop_in_place`]
5359 * [`time::SystemTime`]
5361 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5362 * [`Instant::elapsed`]
5363 * [`SystemTime::now`]
5364 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5365 * [`SystemTime::elapsed`]
5366 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5367 * [`SystemTimeError`]
5368 * [`SystemTimeError::duration`]
5369 * Various impls for `SystemTimeError`
5371 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5372 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5373 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5374 * [The `write!` and `writeln!` macros correctly emit errors if any of
5375 their arguments can't be formatted][1.8w].
5376 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5377 * [The Unix-specific `raw` modules, which contain a number of
5378 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5379 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5380 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5381 across platforms was making it difficult to implement `std`
5382 correctly. Those that need these definitions should use the `libc`
5384 * The Unix-specific `MetadataExt` traits, including
5385 `os::unix::fs::MetadataExt`, which expose values such as inode
5386 numbers [no longer return platform-specific types][1.8r], but
5387 instead return widened integers. [RFC 1415].
5388 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5389 * [Atomic loads and stores are not volatile][1.8a].
5390 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5395 * [Inlining hash functions lead to a 3% compile-time improvement in
5396 some workloads][1.8h].
5397 * When using jemalloc, its symbols are [unprefixed so that it
5398 overrides the libc malloc implementation][1.8h]. This means that for
5399 rustc, LLVM is now using jemalloc, which results in a 6%
5400 compile-time improvement on a specific workload.
5401 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5406 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5407 i686-pc-windows-msvc is now considered a tier-1 platform.
5408 * [The `--print targets` flag prints a list of supported targets][1.8t].
5409 * [The `--print cfg` flag prints the `cfg`s defined for the current
5411 * [`rustc` can be built with an new Cargo-based build system, written
5412 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
5413 build system. To enable it configure with `configure --rustbuild`.
5414 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
5415 variants while also indicating the total number of missing variants
5416 if more than 3][1.8m].
5417 * [Executable stacks are disabled on Linux and BSD][1.8nx].
5418 * The Rust Project now publishes binary releases of the standard
5419 library for a number of tier-2 targets:
5420 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
5421 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
5422 `x86_64-rumprun-netbsd`. These can be installed with
5423 tools such as [multirust][1.8mr].
5428 * [`cargo init` creates a new Cargo project in the current
5429 directory][1.8ci]. It is otherwise like `cargo new`.
5430 * [Cargo has configuration keys for `-v` and
5431 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
5432 `[term]` section of `.cargo/config`.
5433 * [Configuration keys that evaluate to strings or integers can be set
5434 via environment variables][1.8ce]. For example the `build.jobs` key
5435 can be set via `CARGO_BUILD_JOBS`. Environment variables take
5436 precedence over config files.
5437 * [Target-specific dependencies support Rust `cfg` syntax for
5438 describing targets][1.8cfg] so that dependencies for multiple
5439 targets can be specified together. [RFC 1361].
5440 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
5441 `RUSTDOC` take precedence over the `build.target-dir`,
5442 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
5443 * [The child process tree is killed on Windows when Cargo is
5445 * [The `build.target` configuration value sets the target platform,
5446 like `--target`][1.8ct].
5451 * [Unstable compiler flags have been further restricted][1.8u]. Since
5452 1.0 `-Z` flags have been considered unstable, and other flags that
5453 were considered unstable additionally required passing `-Z
5454 unstable-options` to access. Unlike unstable language and library
5455 features though, these options have been accessible on the stable
5456 release channel. Going forward, *new unstable flags will not be
5457 available on the stable release channel*, and old unstable flags
5458 will warn about their usage. In the future, all unstable flags will
5459 be unavailable on the stable release channel.
5460 * [It is no longer possible to `match` on empty enum variants using
5461 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
5462 * The Unix-specific `MetadataExt` traits, including
5463 `os::unix::fs::MetadataExt`, which expose values such as inode
5464 numbers [no longer return platform-specific types][1.8r], but
5465 instead return widened integers. [RFC 1415].
5466 * [Modules sourced from the filesystem cannot appear within arbitrary
5467 blocks, but only within other modules][1.8mf].
5468 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
5469 * On Unix, [stack overflow triggers a runtime abort instead of a
5471 * [`Command::spawn` and its equivalents return an error if any of
5472 its command-line arguments contain interior `NUL`s][1.8n].
5473 * [Tuple and unit enum variants from other crates are in the type
5475 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
5476 type instead of `.a` files][1.8st]. Additionally, for the MSVC
5477 toolchain, `rustc` emits import libraries named `foo.dll.lib`
5478 instead of `foo.lib`.
5481 [1.8a]: https://github.com/rust-lang/rust/pull/30962
5482 [1.8b]: https://github.com/rust-lang/rust/pull/31123
5483 [1.8c]: https://github.com/rust-lang/rust/pull/31530
5484 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
5485 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
5486 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5487 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5488 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5489 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5490 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5491 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5492 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5493 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5494 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5495 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5496 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5497 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5498 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5499 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5500 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5501 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5502 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5503 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5504 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5505 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5506 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5507 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5508 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5509 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5510 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5511 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5512 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5513 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5514 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5515 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5516 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5517 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5518 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5519 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5520 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5521 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5522 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5523 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5524 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5525 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5526 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5527 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5528 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5529 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5530 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5531 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5532 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5533 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5534 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5535 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5536 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5537 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5538 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5539 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5540 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5543 Version 1.7.0 (2016-03-03)
5544 ==========================
5551 * [`Path::strip_prefix`] (renamed from relative_from)
5552 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
5554 * [`Ipv4Addr::is_loopback`]
5555 * [`Ipv4Addr::is_private`]
5556 * [`Ipv4Addr::is_link_local`]
5557 * [`Ipv4Addr::is_multicast`]
5558 * [`Ipv4Addr::is_broadcast`]
5559 * [`Ipv4Addr::is_documentation`]
5561 * [`Ipv6Addr::is_unspecified`]
5562 * [`Ipv6Addr::is_loopback`]
5563 * [`Ipv6Addr::is_multicast`]
5566 * [`Vec::as_mut_slice`]
5568 * [`String::as_str`]
5569 * [`String::as_mut_str`]
5571 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5573 * `<[T]>::`[`sort_by_key`]
5574 * checked, saturated, and overflowing operations
5575 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
5576 * [`i32::saturating_mul`]
5577 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
5578 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
5579 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
5580 * [`u32::saturating_mul`]
5581 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
5582 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
5583 * and checked, saturated, and overflowing operations for other primitive types
5585 * [`ffi::IntoStringError`]
5586 * [`CString::into_string`]
5587 * [`CString::into_bytes`]
5588 * [`CString::into_bytes_with_nul`]
5589 * `From<CString> for Vec<u8>`
5591 * [`IntoStringError::into_cstring`]
5592 * [`IntoStringError::utf8_error`]
5593 * `Error for IntoStringError`
5595 * [`std::hash::BuildHasher`]
5596 * [`BuildHasher::Hasher`]
5597 * [`BuildHasher::build_hasher`]
5598 * [`std::hash::BuildHasherDefault`]
5599 * [`HashMap::with_hasher`]
5600 * [`HashMap::with_capacity_and_hasher`]
5601 * [`HashSet::with_hasher`]
5602 * [`HashSet::with_capacity_and_hasher`]
5603 * [`std::collections::hash_map::RandomState`]
5604 * [`RandomState::new`]
5605 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
5606 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
5607 from bytes is faster.
5608 * [The performance of `LineWriter` (and thus `io::stdout`) was
5609 improved by using `memchr` to search for newlines][1.7m].
5610 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
5611 `f64` variants were stabilized previously.
5612 * [`BTreeMap` was rewritten to use less memory and improve the performance
5613 of insertion and iteration, the latter by as much as 5x][1.7bm].
5614 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
5615 covariant over their contained type][1.7bt].
5616 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
5617 over their contained type][1.7ll].
5618 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
5620 * [`Any` is implemented for unsized types][1.7a].
5621 * [`Hash` is implemented for `Duration`][1.7h].
5626 * [When running tests with `--test`, rustdoc will pass `--cfg`
5627 arguments to the compiler][1.7dt].
5628 * [The compiler is built with RPATH information by default][1.7rpa].
5629 This means that it will be possible to run `rustc` when installed in
5630 unusual configurations without configuring the dynamic linker search
5632 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
5633 any RPATH entries (emitted with `-C rpath`) *not* take precedence
5634 over `LD_LIBRARY_PATH`.
5639 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
5640 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
5641 * [The `rerun-if-changed` build script directive no longer causes the
5642 build script to incorrectly run twice in certain scenarios][1.7rr].
5647 * Soundness fixes to the interactions between associated types and
5648 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
5649 code that violates the new rules. This is a significant change that
5650 is known to break existing code, so it has emitted warnings for the
5651 new error cases since 1.4 to give crate authors time to adapt. The
5652 details of what is changing are subtle; read the RFC for more.
5653 * [Several bugs in the compiler's visibility calculations were
5654 fixed][1.7v]. Since this was found to break significant amounts of
5655 code, the new errors will be emitted as warnings for several release
5656 cycles, under the `private_in_public` lint.
5657 * Defaulted type parameters were accidentally accepted in positions
5658 that were not intended. In this release, [defaulted type parameters
5659 appearing outside of type definitions will generate a
5660 warning][1.7d], which will become an error in future releases.
5661 * [Parsing "." as a float results in an error instead of 0][1.7p].
5662 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
5663 * [Borrows of closure parameters may not outlive the closure][1.7bc].
5665 [1.7a]: https://github.com/rust-lang/rust/pull/30928
5666 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
5667 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
5668 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
5669 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
5670 [1.7d]: https://github.com/rust-lang/rust/pull/30724
5671 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
5672 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
5673 [1.7f]: https://github.com/rust-lang/rust/pull/30672
5674 [1.7h]: https://github.com/rust-lang/rust/pull/30818
5675 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
5676 [1.7m]: https://github.com/rust-lang/rust/pull/30381
5677 [1.7p]: https://github.com/rust-lang/rust/pull/30681
5678 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
5679 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
5680 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
5681 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
5682 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
5683 [1.7v]: https://github.com/rust-lang/rust/pull/29973
5684 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5685 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5686 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
5687 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
5688 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
5689 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
5690 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
5691 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
5692 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
5693 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
5694 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
5695 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
5696 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
5697 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
5698 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
5699 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
5700 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
5701 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
5702 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
5703 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
5704 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
5705 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
5706 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
5707 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
5708 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
5709 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
5710 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
5711 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
5712 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
5713 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
5714 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
5715 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
5716 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
5717 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
5718 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
5719 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
5720 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
5721 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
5722 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
5723 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
5724 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
5725 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
5726 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
5727 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
5728 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
5729 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
5730 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
5731 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5732 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
5733 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5734 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
5735 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
5736 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
5737 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
5738 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
5739 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
5740 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
5741 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
5742 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
5743 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
5746 Version 1.6.0 (2016-01-21)
5747 ==========================
5752 * The `#![no_std]` attribute causes a crate to not be linked to the
5753 standard library, but only the [core library][1.6co], as described
5754 in [RFC 1184]. The core library defines common types and traits but
5755 has no platform dependencies whatsoever, and is the basis for Rust
5756 software in environments that cannot support a full port of the
5757 standard library, such as operating systems. Most of the core
5758 library is now stable.
5764 [`Read::read_exact`],
5765 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
5766 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
5767 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
5768 [`os::unix::fs::DirBuilderExt`],
5769 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
5770 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
5771 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
5772 [`collections::hash_map::Drain`],
5773 [`collections::hash_map::HashMap::drain`],
5774 [`collections::hash_set::Drain`],
5775 [`collections::hash_set::HashSet::drain`],
5776 [`collections::binary_heap::Drain`],
5777 [`collections::binary_heap::BinaryHeap::drain`],
5778 [`Vec::extend_from_slice`] (renamed from `push_all`),
5779 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
5780 [`RwLock::into_inner`],
5781 [`Iterator::min_by_key`] (renamed from `min_by`),
5782 [`Iterator::max_by_key`] (renamed from `max_by`).
5783 * The [core library][1.6co] is stable, as are most of its APIs.
5784 * [The `assert_eq!` macro supports arguments that don't implement
5785 `Sized`][1.6ae], such as arrays. In this way it behaves more like
5787 * Several timer functions that take duration in milliseconds [are
5788 deprecated in favor of those that take `Duration`][1.6ms]. These
5789 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
5790 `thread::park_timeout_ms`.
5791 * The algorithm by which `Vec` reserves additional elements was
5792 [tweaked to not allocate excessive space][1.6a] while still growing
5794 * `From` conversions are [implemented from integers to floats][1.6f]
5795 in cases where the conversion is lossless. Thus they are not
5796 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
5797 or `f64`. They are also not implemented for `isize` and `usize`
5798 because the implementations would be platform-specific. `From` is
5799 also implemented from `f32` to `f64`.
5800 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
5801 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
5802 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
5803 * [`BinaryHeap` was refactored][1.6bh] for modest performance
5805 * Sorting slices that are already sorted [is 50% faster in some
5811 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
5812 * Cargo build scripts can specify their dependencies by emitting the
5813 [`rerun-if-changed`][1.6rr] key.
5814 * crates.io will reject publication of crates with dependencies that
5815 have a wildcard version constraint. Crates with wildcard
5816 dependencies were seen to cause a variety of problems, as described
5817 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
5819 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
5820 release folder. A variety of artifacts that Cargo failed to clean
5821 are now correctly deleted.
5826 * The `unreachable_code` lint [warns when a function call's argument
5828 * The parser indicates [failures that may be caused by
5829 confusingly-similar Unicode characters][1.6uc]
5830 * Certain macro errors [are reported at definition time][1.6m], not
5836 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
5837 environment variable when locating crates. This was a pre-cargo
5838 feature for integrating with the package manager that was
5839 accidentally never removed.
5840 * [A number of bugs were fixed in the privacy checker][1.6p] that
5841 could cause previously-accepted code to break.
5842 * [Modules and unit/tuple structs may not share the same name][1.6ts].
5843 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
5844 struct pattern syntax (`Foo(..)`) can no longer be used to match
5845 unit structs. This is a warning now, but will become an error in
5846 future releases. Patterns that share the same name as a const are
5848 * A bug was fixed that causes [rustc not to apply default type
5849 parameters][1.6xc] when resolving certain method implementations of
5850 traits defined in other crates.
5852 [1.6a]: https://github.com/rust-lang/rust/pull/29454
5853 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
5854 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
5855 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
5856 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
5857 [1.6co]: http://doc.rust-lang.org/core/index.html
5858 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
5859 [1.6f]: https://github.com/rust-lang/rust/pull/29129
5860 [1.6m]: https://github.com/rust-lang/rust/pull/29828
5861 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
5862 [1.6p]: https://github.com/rust-lang/rust/pull/29726
5863 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
5864 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
5865 [1.6s]: https://github.com/rust-lang/rust/pull/29675
5866 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
5867 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
5868 [1.6us]: https://github.com/rust-lang/rust/pull/29383
5869 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
5870 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
5871 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5872 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
5873 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
5874 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
5875 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
5876 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
5877 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
5878 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
5879 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
5880 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
5881 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
5882 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
5883 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
5884 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
5885 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
5886 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
5887 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
5888 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
5889 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
5890 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
5891 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
5892 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
5893 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
5894 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
5895 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
5896 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
5897 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
5898 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
5901 Version 1.5.0 (2015-12-10)
5902 ==========================
5904 * ~700 changes, numerous bugfixes
5910 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
5911 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
5912 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
5913 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
5914 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
5915 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
5916 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
5917 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
5918 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
5919 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
5920 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
5921 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
5922 [`Path::read_link`], [`Path::symlink_metadata`],
5923 [`Utf8Error::valid_up_to`], [`Vec::resize`],
5924 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
5925 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
5926 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
5927 [`slice::split_first_mut`], [`slice::split_first`],
5928 [`slice::split_last_mut`], [`slice::split_last`],
5929 [`char::from_u32_unchecked`], [`fs::canonicalize`],
5930 [`str::MatchIndices`], [`str::RMatchIndices`],
5931 [`str::match_indices`], [`str::rmatch_indices`],
5932 [`str::slice_mut_unchecked`], [`string::ParseError`].
5933 * Rust applications hosted on crates.io can be installed locally to
5934 `~/.cargo/bin` with the [`cargo install`] command. Among other
5935 things this makes it easier to augment Cargo with new subcommands:
5936 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
5937 invoked as `cargo foo`.
5938 * Crates with wildcard (`*`) dependencies will [emit warnings when
5939 published][1.5w]. In 1.6 it will no longer be possible to publish
5940 crates with wildcard dependencies.
5945 * The rules determining when a particular lifetime must outlive
5946 a particular value (known as '[dropck]') have been [modified
5947 to not rely on parametricity][1.5p].
5948 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
5949 and `Arc`][1.5a]. Because these smart pointer types implement
5950 `Deref`, this causes breakage in cases where the interior type
5951 contains methods of the same name.
5952 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
5953 that they could drop their content. Soundness fix.
5954 * All method invocations are [properly checked][1.5wf1] for
5955 [well-formedness][1.5wf2]. Soundness fix.
5956 * Traits whose supertraits contain `Self` are [not object
5957 safe][1.5o]. Soundness fix.
5958 * Target specifications support a [`no_default_libraries`][1.5nd]
5959 setting that controls whether `-nodefaultlibs` is passed to the
5960 linker, and in turn the `is_like_windows` setting no longer affects
5961 the `-nodefaultlibs` flag.
5962 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
5963 * The `#[inline]` and `#[repr]` attributes [can only appear
5964 in valid locations][1.5at].
5965 * Native libraries linked from the local crate are [passed to
5966 the linker before native libraries from upstream crates][1.5nl].
5967 * Two rarely-used attributes, `#[no_debug]` and
5968 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
5969 * Negation of unsigned integers, which has been a warning for
5970 several releases, [is now behind a feature gate and will
5971 generate errors][1.5nu].
5972 * The parser accidentally accepted visibility modifiers on
5973 enum variants, a bug [which has been fixed][1.5ev].
5974 * [A bug was fixed that allowed `use` statements to import unstable
5980 * When evaluating expressions at compile-time that are not
5981 compile-time constants (const-evaluating expressions in non-const
5982 contexts), incorrect code such as overlong bitshifts and arithmetic
5983 overflow will [generate a warning instead of an error][1.5ce],
5984 delaying the error until runtime. This will allow the
5985 const-evaluator to be expanded in the future backwards-compatibly.
5986 * The `improper_ctypes` lint [no longer warns about using `isize` and
5987 `usize` in FFI][1.5ict].
5992 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
5994 * `Default` is [implemented for mutable slices][1.5d].
5995 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
5996 * There are now `From` conversions [between floating point
5997 types][1.5f] where the conversions are lossless.
5998 * There are now `From` conversions [between integer types][1.5i] where
5999 the conversions are lossless.
6000 * [`fs::Metadata` implements `Clone`][1.5fs].
6001 * The `parse` method [accepts a leading "+" when parsing
6003 * [`AsMut` is implemented for `Vec`][1.5am].
6004 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6005 been optimized][1.5cf] and no longer rely on the default impl.
6006 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6007 `unsafe extern "C"` function types now [implement `Clone`,
6008 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6009 `fmt::Debug` for up to 12 arguments][1.5fp].
6010 * [Dropping `Vec`s is much faster in unoptimized builds when the
6011 element types don't implement `Drop`][1.5dv].
6012 * A bug that caused in incorrect behavior when [combining `VecDeque`
6013 with zero-sized types][1.5vdz] was resolved.
6014 * [`PartialOrd` for slices is faster][1.5po].
6019 * [Crate metadata size was reduced by 20%][1.5md].
6020 * [Improvements to code generation reduced the size of libcore by 3.3
6021 MB and rustc's memory usage by 18MB][1.5m].
6022 * [Improvements to deref translation increased performance in
6023 unoptimized builds][1.5dr].
6024 * Various errors in trait resolution [are deduplicated to only be
6025 reported once][1.5te].
6026 * Rust has preliminary [support for rumprun kernels][1.5rr].
6027 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6029 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6030 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6031 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6032 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6033 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6034 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6035 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6036 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6037 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6038 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6039 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6040 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6041 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6042 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6043 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6044 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6045 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6046 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6047 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6048 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6049 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6050 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6051 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6052 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6053 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6054 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6055 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6056 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6057 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6058 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6059 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6060 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6061 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6062 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6063 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6064 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6065 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6066 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6067 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6068 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6069 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6070 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6071 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6072 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6073 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6074 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6075 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6076 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6077 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6078 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6079 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6080 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6081 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6082 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6083 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6084 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6085 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6086 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6087 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6088 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6089 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6090 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6091 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6092 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6093 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6094 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6095 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6096 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6097 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6098 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6099 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6100 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6101 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6102 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6103 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6104 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6105 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6106 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6107 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6108 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6109 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6110 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6111 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6112 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6113 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6114 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6115 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6116 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6117 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6119 Version 1.4.0 (2015-10-29)
6120 ==========================
6122 * ~1200 changes, numerous bugfixes
6127 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6128 GNU) are now supported and recommended for use.
6133 * [Several changes have been made to fix type soundness and improve
6134 the behavior of associated types][sound]. See [RFC 1214]. Although
6135 we have mostly introduced these changes as warnings this release, to
6136 become errors next release, there are still some scenarios that will
6137 see immediate breakage.
6138 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6139 line breaks in addition to `\n`][crlf].
6140 * [Loans of `'static` lifetime extend to the end of a function][stat].
6141 * [`str::parse` no longer introduces avoidable rounding error when
6142 parsing floating point numbers. Together with earlier changes to
6143 float formatting/output, "round trips" like f.to_string().parse()
6144 now preserve the value of f exactly. Additionally, leading plus
6145 signs are now accepted][fp3].
6151 * `use` statements that import multiple items [can now rename
6152 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6153 * [Binops work correctly on fat pointers][binfat].
6154 * `pub extern crate`, which does not behave as expected, [issues a
6155 warning][pec] until a better solution is found.
6160 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6161 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6162 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6163 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6164 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6165 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6166 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6167 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6168 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6169 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6170 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6171 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6172 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6173 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6174 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6175 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6176 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6177 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6179 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6180 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6181 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6182 `f64::from_str_radix`.
6183 * [Reverse-searching strings is faster with the 'two-way'
6185 * [`std::io::copy` allows `?Sized` arguments][cc].
6186 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6187 [override `count`, `nth` and `last` with an O(1)
6188 implementation][it].
6189 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6190 * [`IntoRawFd` has been added to the Unix-specific prelude,
6191 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6193 * [`Extend<String>` and `FromIterator<String` are both implemented for
6195 * [`IntoIterator` is implemented for references to `Option` and
6197 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6198 Copy`][ext] as part of [RFC 839]. This will cause type inference
6199 breakage in rare situations.
6200 * [`BinaryHeap` implements `Debug`][bh2].
6201 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6203 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6204 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6205 * [String comparison is faster][faststr].
6206 * `&mut T` where `T: std::fmt::Write` [also implements
6207 `std::fmt::Write`][mutw].
6208 * [A stable regression in `VecDeque::push_back` and other
6209 capacity-altering methods that caused panics for zero-sized types
6211 * [Function pointers implement traits for up to 12 parameters][fp2].
6216 * The compiler [no longer uses the 'morestack' feature to prevent
6217 stack overflow][mm]. Instead it uses guard pages and stack
6218 probes (though stack probes are not yet implemented on any platform
6220 * [The compiler matches traits faster when projections are involved][p].
6221 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6223 * [Cargo now displays useful information about what its doing during
6224 `cargo update`][cu].
6226 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6227 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6228 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6229 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6230 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6231 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6232 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6233 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6234 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6235 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6236 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6237 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6238 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6239 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6240 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6241 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6242 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6243 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6244 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6245 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6246 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6247 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6248 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6249 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6250 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6251 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6252 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6253 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6254 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6255 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6256 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6257 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6258 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6259 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6260 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6261 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6262 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6263 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6264 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6265 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6266 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6267 [bh2]: https://github.com/rust-lang/rust/pull/28156
6268 [binfat]: https://github.com/rust-lang/rust/pull/28270
6269 [bm]: https://github.com/rust-lang/rust/pull/28197
6270 [cc]: https://github.com/rust-lang/rust/pull/27531
6271 [crlf]: https://github.com/rust-lang/rust/pull/28034
6272 [cu]: https://github.com/rust-lang/cargo/pull/1931
6273 [d]: https://github.com/rust-lang/rust/pull/27825
6274 [dep]: https://github.com/rust-lang/rust/pull/28339
6275 [es]: https://github.com/rust-lang/rust/pull/27956
6276 [ext]: https://github.com/rust-lang/rust/pull/28094
6277 [faststr]: https://github.com/rust-lang/rust/pull/28338
6278 [ffi]: https://github.com/rust-lang/rust/pull/28779
6279 [fp]: https://github.com/rust-lang/rust/pull/28268
6280 [fp2]: https://github.com/rust-lang/rust/pull/28560
6281 [fp3]: https://github.com/rust-lang/rust/pull/27307
6282 [i]: https://github.com/rust-lang/rust/pull/27451
6283 [into2]: https://github.com/rust-lang/rust/pull/28039
6284 [it]: https://github.com/rust-lang/rust/pull/27652
6285 [mm]: https://github.com/rust-lang/rust/pull/27338
6286 [mutw]: https://github.com/rust-lang/rust/pull/28368
6287 [sound]: https://github.com/rust-lang/rust/pull/27641
6288 [p]: https://github.com/rust-lang/rust/pull/27866
6289 [pec]: https://github.com/rust-lang/rust/pull/28486
6290 [pr]: https://github.com/rust-lang/rust/pull/27896
6291 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6292 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6293 [s]: https://github.com/rust-lang/rust/pull/27474
6294 [stab]: https://github.com/rust-lang/rust/pull/28339
6295 [stat]: https://github.com/rust-lang/rust/pull/28321
6296 [vd]: https://github.com/rust-lang/rust/pull/28494
6298 Version 1.3.0 (2015-09-17)
6299 ==============================
6301 * ~900 changes, numerous bugfixes
6306 * The [new object lifetime defaults][nold] have been [turned
6307 on][nold2] after a cycle of warnings about the change. Now types
6308 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6309 being interpreted as `&'a Box<Trait+'a>` to `&'a
6310 Box<Trait+'static>`.
6311 * [The Rustonomicon][nom] is a new book in the official documentation
6312 that dives into writing unsafe Rust.
6313 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6314 timekeeping is employed by other std APIs, as well as out-of-tree
6320 * The [new object lifetime defaults][nold] have been [turned
6321 on][nold2] after a cycle of warnings about the change.
6322 * There is a known [regression][lr] in how object lifetime elision is
6323 interpreted, the proper solution for which is undetermined.
6324 * The `#[prelude_import]` attribute, an internal implementation
6325 detail, was accidentally stabilized previously. [It has been put
6326 behind the `prelude_import` feature gate][pi]. This change is
6327 believed to break no existing code.
6328 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6329 [more sane for dynamically sized types][dst3]. Code that relied on
6330 the previous behavior is thought to be broken.
6331 * The `dropck` rules, which checks that destructors can't access
6332 destroyed values, [have been updated][dropck] to match the
6333 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6334 cause some previously-compiling code to no longer build.
6339 * The [new object lifetime defaults][nold] have been [turned
6340 on][nold2] after a cycle of warnings about the change.
6341 * Semicolons may [now follow types and paths in
6342 macros](https://github.com/rust-lang/rust/pull/27000).
6343 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6344 [more sane for dynamically sized types][dst3]. Code that relied on
6345 the previous behavior is not known to exist, and suspected to be
6347 * `'static` variables [may now be recursive][st].
6348 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6349 implementations correctly.
6350 * The `dropck` rules, which checks that destructors can't access
6351 destroyed values, [have been updated][dropck] to match the
6357 * The [`Duration`] API, [has been stabilized][ds], as well as the
6358 `std::time` module, which presently contains only `Duration`.
6359 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6360 * The owned C string, [`CString`], implements [`Borrow`] and the
6361 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6362 these allow C strings to be borrowed and cloned in generic code.
6363 * [`CStr`] implements [`Debug`].
6364 * [`AtomicPtr`] implements [`Debug`].
6365 * [`Error`] trait objects [can be downcast to their concrete types][e]
6366 in many common configurations, using the [`is`], [`downcast`],
6367 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6369 * Searching for substrings now [employs the two-way algorithm][search]
6370 instead of doing a naive search. This gives major speedups to a
6371 number of methods, including [`contains`][sc], [`find`][sf],
6372 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6373 [`ends_with`][sew] are also faster.
6374 * The performance of `PartialEq` for slices is [much faster][ps].
6375 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6376 is overridden and optimized by the implementations for scalars.
6377 * The [`Hasher`] trait now has a number of specialized `write_*`
6378 methods for primitive types, for efficiency.
6379 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6380 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6381 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6382 of [`std::error::Error::cause`][iec] also delegates to the inner
6384 * [`process::Child`][pc] gained the [`id`] method, which returns a
6385 `u32` representing the platform-specific process identifier.
6386 * The [`connect`] method on slices is deprecated, replaced by the new
6387 [`join`] method (note that both of these are on the *unstable*
6388 [`SliceConcatExt`] trait, but through the magic of the prelude are
6389 available to stable code anyway).
6390 * The [`Div`] operator is implemented for [`Wrapping`] types.
6391 * [`DerefMut` is implemented for `String`][dms].
6392 * Performance of SipHash (the default hasher for `HashMap`) is
6393 [better for long data][sh].
6394 * [`AtomicPtr`] implements [`Send`].
6395 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6396 are now [specialized to use uninitialized buffers for increased
6398 * Lifetime parameters of foreign functions [are now resolved
6404 * Rust can now, with some coercion, [produce programs that run on
6405 Windows XP][xp], though XP is not considered a supported platform.
6406 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6407 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6408 recommended for use in 1.3, though should be fully-functional
6409 in the [64-bit 1.4 beta][b14].
6410 * On Fedora-based systems installation will [properly configure the
6411 dynamic linker][fl].
6412 * The compiler gained many new extended error descriptions, which can
6413 be accessed with the `--explain` flag.
6414 * The `dropck` pass, which checks that destructors can't access
6415 destroyed values, [has been rewritten][dropck]. This fixes some
6416 soundness holes, and as such will cause some previously-compiling
6417 code to no longer build.
6418 * `rustc` now uses [LLVM to write archive files where possible][ar].
6419 Eventually this will eliminate the compiler's dependency on the ar
6421 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
6422 supported FreeBSD on x86_64).
6423 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
6424 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
6426 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
6427 will kill the process instead of leaking][nlp].
6429 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
6430 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
6431 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
6432 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
6433 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
6434 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6435 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6436 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
6437 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
6438 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
6439 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
6440 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
6441 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
6442 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6443 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
6444 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
6445 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
6446 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
6447 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6448 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
6449 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
6450 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
6451 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
6452 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6453 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
6454 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
6455 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
6456 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
6457 [ar]: https://github.com/rust-lang/rust/pull/26926
6458 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
6459 [dms]: https://github.com/rust-lang/rust/pull/26241
6460 [dropck]: https://github.com/rust-lang/rust/pull/27261
6461 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6462 [ds]: https://github.com/rust-lang/rust/pull/26818
6463 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
6464 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
6465 [dst3]: https://github.com/rust-lang/rust/pull/27351
6466 [e]: https://github.com/rust-lang/rust/pull/24793
6467 [f]: https://github.com/rust-lang/rust/pull/26588
6468 [fb]: https://github.com/rust-lang/rust/pull/26959
6469 [fl]: https://github.com/rust-lang/rust-installer/pull/41
6470 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6471 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
6472 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
6473 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
6474 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
6475 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
6476 [lic]: https://github.com/rust-lang/rust/pull/26583
6477 [lnu]: https://github.com/rust-lang/rust/pull/27026
6478 [lr]: https://github.com/rust-lang/rust/issues/27248
6479 [lum]: https://github.com/rust-lang/rust/pull/26378
6480 [lur]: https://github.com/rust-lang/rust/pull/26783
6481 [nlp]: https://github.com/rust-lang/rust/pull/27176
6482 [nold2]: https://github.com/rust-lang/rust/pull/27045
6483 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
6484 [nom]: http://doc.rust-lang.org/nightly/nomicon/
6485 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
6486 [pi]: https://github.com/rust-lang/rust/pull/26699
6487 [ps]: https://github.com/rust-lang/rust/pull/26884
6488 [rte]: https://github.com/rust-lang/rust/pull/26950
6489 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6490 [search]: https://github.com/rust-lang/rust/pull/26327
6491 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6492 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6493 [sh]: https://github.com/rust-lang/rust/pull/27280
6494 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6495 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6496 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6497 [st]: https://github.com/rust-lang/rust/pull/26630
6498 [win1]: https://github.com/rust-lang/rust/pull/26569
6499 [win2]: https://github.com/rust-lang/rust/pull/26741
6500 [win3]: https://github.com/rust-lang/rust/pull/26741
6501 [win4]: https://github.com/rust-lang/rust/pull/27210
6502 [xp]: https://github.com/rust-lang/rust/pull/26569
6504 Version 1.2.0 (2015-08-07)
6505 ==========================
6507 * ~1200 changes, numerous bugfixes
6512 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6513 like `Rc` to contain types without a fixed size, arrays and trait
6514 objects, finally enabling use of `Rc<[T]>` and completing the
6515 implementation of DST.
6516 * [Parallel codegen][parcodegen] is now working again, which can
6517 substantially speed up large builds in debug mode; It also gets
6518 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6519 jobs). It's not enabled by default, but will be "in the near
6520 future". It can be activated with the `-C codegen-units=N` flag to
6522 * This is the first release with [experimental support for linking
6523 with the MSVC linker and lib C on Windows (instead of using the GNU
6524 variants via MinGW)][win]. It is yet recommended only for the most
6525 intrepid Rustaceans.
6526 * Benchmark compilations are showing a 30% improvement in
6527 bootstrapping over 1.1.
6532 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6533 unicode case mapping, which is a previously-planned change in
6534 behavior and considered a bugfix.
6535 * [`mem::align_of`] now specifies [the *minimum alignment* for
6536 T][align], which is usually the alignment programs are interested
6537 in, and the same value reported by clang's
6538 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6540 * [The `#[packed]` attribute is no longer silently accepted by the
6541 compiler][packed]. This attribute did nothing and code that
6542 mentioned it likely did not work as intended.
6543 * Associated type defaults are [now behind the
6544 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6545 defaults *did not work*, but could be mentioned syntactically. As
6546 such this breakage has minimal impact.
6551 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6552 matching against dereferenceable values.
6557 * The [`Extend`] trait, which grows a collection from an iterator, is
6558 implemented over iterators of references, for `String`, `Vec`,
6559 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6560 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6561 * The [`iter::once`] function returns an iterator that yields a single
6562 element, and [`iter::empty`] returns an iterator that yields no
6564 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6565 over substring matches.
6566 * [`Cell`] and [`RefCell`] both implement `Eq`.
6567 * A number of methods for wrapping arithmetic are added to the
6568 integral types, [`wrapping_div`], [`wrapping_rem`],
6569 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6570 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6571 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6572 type.. It is illegal for the default arithmetic operations in Rust
6573 to overflow; the desire to wrap must be explicit.
6574 * The `{:#?}` formatting specifier [displays the alternate,
6575 pretty-printed][debugfmt] form of the `Debug` formatter. This
6576 feature was actually introduced prior to 1.0 with little
6578 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
6579 for writing data to formatted strings, similar to [`io::Write`].
6580 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
6581 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
6582 are used by code generators to emit implementations of [`Debug`].
6583 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
6584 methods that convert case, following Unicode case mapping.
6585 * It is now easier to handle poisoned locks. The [`PoisonError`]
6586 type, returned by failing lock operations, exposes `into_inner`,
6587 `get_ref`, and `get_mut`, which all give access to the inner lock
6588 guard, and allow the poisoned lock to continue to operate. The
6589 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
6590 poisoned lock without attempting to take the lock.
6591 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
6592 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
6593 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
6594 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
6596 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
6602 * `rustc` employs smarter heuristics for guessing at [typos].
6603 * `rustc` emits more efficient code for [no-op conversions between
6604 unsafe pointers][nop].
6605 * Fat pointers are now [passed in pairs of immediate arguments][fat],
6606 resulting in faster compile times and smaller code.
6608 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
6609 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6610 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
6611 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
6612 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
6613 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
6614 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
6615 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
6616 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
6617 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
6618 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
6619 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
6620 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
6621 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
6622 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
6623 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
6624 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6625 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
6626 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
6627 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
6628 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
6629 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
6630 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
6631 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
6632 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
6633 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6634 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
6635 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
6636 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
6637 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
6638 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
6639 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
6640 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
6641 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6642 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6643 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
6644 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
6645 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
6646 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
6647 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
6648 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
6649 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6650 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
6651 [align]: https://github.com/rust-lang/rust/pull/25646
6652 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
6653 [typos]: https://github.com/rust-lang/rust/pull/26087
6654 [nop]: https://github.com/rust-lang/rust/pull/26336
6655 [fat]: https://github.com/rust-lang/rust/pull/26411
6656 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
6657 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
6658 [packed]: https://github.com/rust-lang/rust/pull/25541
6659 [ad]: https://github.com/rust-lang/rust/pull/27382
6660 [win]: https://github.com/rust-lang/rust/pull/25350
6662 Version 1.1.0 (2015-06-25)
6663 =========================
6665 * ~850 changes, numerous bugfixes
6670 * The [`std::fs` module has been expanded][fs] to expand the set of
6671 functionality exposed:
6672 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
6673 don't incur a syscall on some platforms.
6674 * A `symlink_metadata` function has been added.
6675 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
6676 access to all underlying information.
6677 * The compiler now contains extended explanations of many errors. When an error
6678 with an explanation occurs the compiler suggests using the `--explain` flag
6679 to read the explanation. Error explanations are also [available online][err-index].
6680 * Thanks to multiple [improvements][sk] to [type checking][pre], as
6681 well as other work, the time to bootstrap the compiler decreased by
6687 * The [`str::split_whitespace`] method splits a string on unicode
6688 whitespace boundaries.
6689 * On both Windows and Unix, new extension traits provide conversion of
6690 I/O types to and from the underlying system handles. On Unix, these
6691 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
6692 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
6693 `TcpListener`, and `UpdSocket`. Further implementations for
6694 `std::process` will be stabilized later.
6695 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
6696 Windows, symlinks can be created with
6697 `std::os::windows::symlink_dir` and
6698 `std::os::windows::symlink_file`.
6699 * The `mpsc::Receiver` type can now be converted into an iterator with
6700 `into_iter` on the [`IntoIterator`] trait.
6701 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
6702 implementation of the [`From`] trait.
6703 * The `Debug` implementation for `RangeFull` [creates output that is
6704 more consistent with other implementations][rf].
6705 * [`Debug` is implemented for `File`][file].
6706 * The `Default` implementation for `Arc` [no longer requires `Sync +
6708 * [The `Iterator` methods `count`, `nth`, and `last` have been
6709 overridden for slices to have O(1) performance instead of O(n)][si].
6710 * Incorrect handling of paths on Windows has been improved in both the
6711 compiler and the standard library.
6712 * [`AtomicPtr` gained a `Default` implementation][ap].
6713 * In accordance with Rust's policy on arithmetic overflow `abs` now
6714 [panics on overflow when debug assertions are enabled][abs].
6715 * The [`Cloned`] iterator, which was accidentally left unstable for
6716 1.0 [has been stabilized][c].
6717 * The [`Incoming`] iterator, which iterates over incoming TCP
6718 connections, and which was accidentally unnamable in 1.0, [is now
6719 properly exported][inc].
6720 * [`BinaryHeap`] no longer corrupts itself [when functions called by
6721 `sift_up` or `sift_down` panic][bh].
6722 * The [`split_off`] method of `LinkedList` [no longer corrupts
6723 the list in certain scenarios][ll].
6728 * Type checking performance [has improved notably][sk] with
6729 [multiple improvements][pre].
6730 * The compiler [suggests code changes][ch] for more errors.
6731 * rustc and it's build system have experimental support for [building
6732 toolchains against MUSL][m] instead of glibc on Linux.
6733 * The compiler defines the `target_env` cfg value, which is used for
6734 distinguishing toolchains that are otherwise for the same
6735 platform. Presently this is set to `gnu` for common GNU Linux
6736 targets and for MinGW targets, and `musl` for MUSL Linux targets.
6737 * The [`cargo rustc`][crc] command invokes a build with custom flags
6739 * [Android executables are always position independent][pie].
6740 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
6743 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
6744 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6745 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6746 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
6747 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
6748 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
6749 [rf]: https://github.com/rust-lang/rust/pull/24491
6750 [err-index]: https://doc.rust-lang.org/error-index.html
6751 [sk]: https://github.com/rust-lang/rust/pull/24615
6752 [pre]: https://github.com/rust-lang/rust/pull/25323
6753 [file]: https://github.com/rust-lang/rust/pull/24598
6754 [ch]: https://github.com/rust-lang/rust/pull/24683
6755 [arc]: https://github.com/rust-lang/rust/pull/24695
6756 [si]: https://github.com/rust-lang/rust/pull/24701
6757 [ap]: https://github.com/rust-lang/rust/pull/24834
6758 [m]: https://github.com/rust-lang/rust/pull/24777
6759 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
6760 [crc]: https://github.com/rust-lang/cargo/pull/1568
6761 [pie]: https://github.com/rust-lang/rust/pull/24953
6762 [abs]: https://github.com/rust-lang/rust/pull/25441
6763 [c]: https://github.com/rust-lang/rust/pull/25496
6764 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
6765 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
6766 [inc]: https://github.com/rust-lang/rust/pull/25522
6767 [bh]: https://github.com/rust-lang/rust/pull/25856
6768 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
6769 [ll]: https://github.com/rust-lang/rust/pull/26022
6770 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
6771 [drop]: https://github.com/rust-lang/rust/pull/24935
6773 Version 1.0.0 (2015-05-15)
6774 ========================
6776 * ~1500 changes, numerous bugfixes
6781 * The vast majority of the standard library is now `#[stable]`. It is
6782 no longer possible to use unstable features with a stable build of
6784 * Many popular crates on [crates.io] now work on the stable release
6786 * Arithmetic on basic integer types now [checks for overflow in debug
6792 * Several [restrictions have been added to trait coherence][coh] in
6793 order to make it easier for upstream authors to change traits
6794 without breaking downstream code.
6795 * Digits of binary and octal literals are [lexed more eagerly][lex] to
6796 improve error messages and macro behavior. For example, `0b1234` is
6797 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
6798 * Trait bounds [are always invariant][inv], eliminating the need for
6799 the `PhantomFn` and `MarkerTrait` lang items, which have been
6801 * ["-" is no longer a valid character in crate names][cr], the `extern crate
6802 "foo" as bar` syntax has been replaced with `extern crate foo as
6803 bar`, and Cargo now automatically translates "-" in *package* names
6804 to underscore for the crate name.
6805 * [Lifetime shadowing is an error][lt].
6806 * [`Send` no longer implies `'static`][send-rfc].
6807 * [UFCS now supports trait-less associated paths][moar-ufcs] like
6808 `MyType::default()`.
6809 * Primitive types [now have inherent methods][prim-inherent],
6810 obviating the need for extension traits like `SliceExt`.
6811 * Methods with `Self: Sized` in their `where` clause are [considered
6812 object-safe][self-sized], allowing many extension traits like
6813 `IteratorExt` to be merged into the traits they extended.
6814 * You can now [refer to associated types][assoc-where] whose
6815 corresponding trait bounds appear only in a `where` clause.
6816 * The final bits of [OIBIT landed][oibit-final], meaning that traits
6817 like `Send` and `Sync` are now library-defined.
6818 * A [Reflect trait][reflect] was introduced, which means that
6819 downcasting via the `Any` trait is effectively limited to concrete
6820 types. This helps retain the potentially-important "parametricity"
6821 property: generic code cannot behave differently for different type
6822 arguments except in minor ways.
6823 * The `unsafe_destructor` feature is now deprecated in favor of the
6824 [new `dropck`][dropck]. This change is a major reduction in unsafe
6830 * The `thread_local` module [has been renamed to `std::thread`][th].
6831 * The methods of `IteratorExt` [have been moved to the `Iterator`
6833 * Several traits that implement Rust's conventions for type
6834 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
6835 [centralized in the `std::convert` module][con].
6836 * The `FromError` trait [was removed in favor of `From`][fe].
6837 * The basic sleep function [has moved to
6838 `std::thread::sleep_ms`][slp].
6839 * The `splitn` function now takes an `n` parameter that represents the
6840 number of items yielded by the returned iterator [instead of the
6841 number of 'splits'][spl].
6842 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
6843 * [Derived implementations of `PartialOrd` now order enums according
6844 to their explicitly-assigned discriminants][po].
6845 * [Methods for searching strings are generic over `Pattern`s][pat],
6846 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
6848 * [In method resolution, object methods are resolved before inherent
6850 * [`String::from_str` has been deprecated in favor of the `From` impl,
6851 `String::from`][sf].
6852 * [`io::Error` implements `Sync`][ios].
6853 * [The `words` method on `&str` has been replaced with
6854 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
6856 * The new path and IO modules are complete and `#[stable]`. This
6857 was the major library focus for this cycle.
6858 * The path API was [revised][path-normalize] to normalize `.`,
6859 adjusting the tradeoffs in favor of the most common usage.
6860 * A large number of remaining APIs in `std` were also stabilized
6861 during this cycle; about 75% of the non-deprecated API surface
6863 * The new [string pattern API][string-pattern] landed, which makes
6864 the string slice API much more internally consistent and flexible.
6865 * A new set of [generic conversion traits][conversion] replaced
6866 many existing ad hoc traits.
6867 * Generic numeric traits were [completely removed][num-traits]. This
6868 was made possible thanks to inherent methods for primitive types,
6869 and the removal gives maximal flexibility for designing a numeric
6870 hierarchy in the future.
6871 * The `Fn` traits are now related via [inheritance][fn-inherit]
6872 and provide ergonomic [blanket implementations][fn-blanket].
6873 * The `Index` and `IndexMut` traits were changed to
6874 [take the index by value][index-value], enabling code like
6875 `hash_map["string"]` to work.
6876 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
6877 `Copy` data is known to be `Clone` as well.
6882 * Many errors now have extended explanations that can be accessed with
6883 the `--explain` flag to `rustc`.
6884 * Many new examples have been added to the standard library
6886 * rustdoc has received a number of improvements focused on completion
6888 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
6889 * Much headway was made on ecosystem-wide CI, making it possible
6890 to [compare builds for breakage][ci-compare].
6893 [crates.io]: http://crates.io
6894 [clo]: https://github.com/rust-lang/rust/pull/24034
6895 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
6896 [con]: https://github.com/rust-lang/rust/pull/23875
6897 [cr]: https://github.com/rust-lang/rust/pull/23419
6898 [fe]: https://github.com/rust-lang/rust/pull/23879
6899 [ie]: https://github.com/rust-lang/rust/pull/23300
6900 [inv]: https://github.com/rust-lang/rust/pull/23938
6901 [ios]: https://github.com/rust-lang/rust/pull/24133
6902 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
6903 [lt]: https://github.com/rust-lang/rust/pull/24057
6904 [meth]: https://github.com/rust-lang/rust/pull/24056
6905 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
6906 [po]: https://github.com/rust-lang/rust/pull/24270
6907 [sf]: https://github.com/rust-lang/rust/pull/24517
6908 [slp]: https://github.com/rust-lang/rust/pull/23949
6909 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
6910 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
6911 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
6912 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
6913 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
6914 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
6915 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
6916 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
6917 [self-sized]: https://github.com/rust-lang/rust/pull/22301
6918 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
6919 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
6920 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
6921 [reflect]: https://github.com/rust-lang/rust/pull/23712
6922 [conversion]: https://github.com/rust-lang/rfcs/pull/529
6923 [num-traits]: https://github.com/rust-lang/rust/pull/23549
6924 [index-value]: https://github.com/rust-lang/rust/pull/23601
6925 [dropck]: https://github.com/rust-lang/rfcs/pull/769
6926 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
6927 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
6928 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
6929 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
6930 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
6933 Version 1.0.0-alpha.2 (2015-02-20)
6934 =====================================
6936 * ~1300 changes, numerous bugfixes
6940 * The various I/O modules were [overhauled][io-rfc] to reduce
6941 unnecessary abstractions and provide better interoperation with
6942 the underlying platform. The old `io` module remains temporarily
6944 * The standard library now [participates in feature gating][feat],
6945 so use of unstable libraries now requires a `#![feature(...)]`
6946 attribute. The impact of this change is [described on the
6947 forum][feat-forum]. [RFC][feat-rfc].
6951 * `for` loops [now operate on the `IntoIterator` trait][into],
6952 which eliminates the need to call `.iter()`, etc. to iterate
6953 over collections. There are some new subtleties to remember
6954 though regarding what sort of iterators various types yield, in
6955 particular that `for foo in bar { }` yields values from a move
6956 iterator, destroying the original collection. [RFC][into-rfc].
6957 * Objects now have [default lifetime bounds][obj], so you don't
6958 have to write `Box<Trait+'static>` when you don't care about
6959 storing references. [RFC][obj-rfc].
6960 * In types that implement `Drop`, [lifetimes must outlive the
6961 value][drop]. This will soon make it possible to safely
6962 implement `Drop` for types where `#[unsafe_destructor]` is now
6963 required. Read the [gorgeous RFC][drop-rfc] for details.
6964 * The fully qualified <T as Trait>::X syntax lets you set the Self
6965 type for a trait method or associated type. [RFC][ufcs-rfc].
6966 * References to types that implement `Deref<U>` now [automatically
6967 coerce to references][deref] to the dereferenced type `U`,
6968 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
6969 should eliminate many unsightly uses of `&*`, as when converting
6970 from references to vectors into references to
6971 slices. [RFC][deref-rfc].
6972 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
6973 `|:|`) is obsolete and closure kind is inferred from context.
6974 * [`Self` is a keyword][Self].
6978 * The `Show` and `String` formatting traits [have been
6979 renamed][fmt] to `Debug` and `Display` to more clearly reflect
6980 their related purposes. Automatically getting a string
6981 conversion to use with `format!("{:?}", something_to_debug)` is
6982 now written `#[derive(Debug)]`.
6983 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
6984 OsStr}`, provide strings in platform-specific encodings for easier
6985 interop with system APIs. [RFC][osstr-rfc].
6986 * The `boxed::into_raw` and `Box::from_raw` functions [convert
6987 between `Box<T>` and `*mut T`][boxraw], a common pattern for
6988 creating raw pointers.
6992 * Certain long error messages of the form 'expected foo found bar'
6993 are now [split neatly across multiple
6994 lines][multiline]. Examples in the PR.
6995 * On Unix Rust can be [uninstalled][un] by running
6996 `/usr/local/lib/rustlib/uninstall.sh`.
6997 * The `#[rustc_on_unimplemented]` attribute, requiring the
6998 'on_unimplemented' feature, lets rustc [display custom error
6999 messages when a trait is expected to be implemented for a type
7004 * Rust is tested against a [LALR grammar][lalr], which parses
7005 almost all the Rust files that rustc does.
7007 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7008 [close]: https://github.com/rust-lang/rust/pull/21843
7009 [deref]: https://github.com/rust-lang/rust/pull/21351
7010 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7011 [drop]: https://github.com/rust-lang/rust/pull/21972
7012 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7013 [feat]: https://github.com/rust-lang/rust/pull/21248
7014 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7015 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7016 [fmt]: https://github.com/rust-lang/rust/pull/21457
7017 [into]: https://github.com/rust-lang/rust/pull/20790
7018 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7019 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7020 [lalr]: https://github.com/rust-lang/rust/pull/21452
7021 [multiline]: https://github.com/rust-lang/rust/pull/19870
7022 [obj]: https://github.com/rust-lang/rust/pull/22230
7023 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7024 [onun]: https://github.com/rust-lang/rust/pull/20889
7025 [osstr]: https://github.com/rust-lang/rust/pull/21488
7026 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7027 [Self]: https://github.com/rust-lang/rust/pull/22158
7028 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7029 [un]: https://github.com/rust-lang/rust/pull/22256
7032 Version 1.0.0-alpha (2015-01-09)
7033 ==================================
7035 * ~2400 changes, numerous bugfixes
7039 * The language itself is considered feature complete for 1.0,
7040 though there will be many usability improvements and bugfixes
7041 before the final release.
7042 * Nearly 50% of the public API surface of the standard library has
7043 been declared 'stable'. Those interfaces are unlikely to change
7045 * The long-running debate over integer types has been
7046 [settled][ints]: Rust will ship with types named `isize` and
7047 `usize`, rather than `int` and `uint`, for pointer-sized
7048 integers. Guidelines will be rolled out during the alpha cycle.
7049 * Most crates that are not `std` have been moved out of the Rust
7050 distribution into the Cargo ecosystem so they can evolve
7051 separately and don't need to be stabilized as quickly, including
7052 'time', 'getopts', 'num', 'regex', and 'term'.
7053 * Documentation continues to be expanded with more API coverage, more
7054 examples, and more in-depth explanations. The guides have been
7055 consolidated into [The Rust Programming Language][trpl].
7056 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7057 * All official Rust binary installers now come with [Cargo], the
7058 Rust package manager.
7062 * Closures have been [completely redesigned][unboxed] to be
7063 implemented in terms of traits, can now be used as generic type
7064 bounds and thus monomorphized and inlined, or via an opaque
7065 pointer (boxed) as in the old system. The new system is often
7066 referred to as 'unboxed' closures.
7067 * Traits now support [associated types][assoc], allowing families
7068 of related types to be defined together and used generically in
7070 * Enum variants are [namespaced by their type names][enum].
7071 * [`where` clauses][where] provide a more versatile and attractive
7072 syntax for specifying generic bounds, though the previous syntax
7074 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7076 * Rust [no longer has a runtime][rt] of any description, and only
7077 supports OS threads, not green threads.
7078 * At long last, Rust has been overhauled for 'dynamically-sized
7079 types' ([DST]), which integrates 'fat pointers' (object types,
7080 arrays, and `str`) more deeply into the type system, making it
7082 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7083 `..j` that produce range types and which, when combined with the
7084 `Index` operator and multidispatch, leads to a convenient slice
7086 * The new range syntax revealed an ambiguity in the fixed-length
7087 array syntax, so now fixed length arrays [are written `[T;
7089 * The `Copy` trait is no longer implemented automatically. Unsafe
7090 pointers no longer implement `Sync` and `Send` so types
7091 containing them don't automatically either. `Sync` and `Send`
7092 are now 'unsafe traits' so one can "forcibly" implement them via
7093 `unsafe impl` if a type confirms to the requirements for them
7094 even though the internals do not (e.g. structs containing unsafe
7095 pointers like `Arc`). These changes are intended to prevent some
7096 footguns and are collectively known as [opt-in built-in
7097 traits][oibit] (though `Sync` and `Send` will soon become pure
7098 library types unknown to the compiler).
7099 * Operator traits now take their operands [by value][ops], and
7100 comparison traits can use multidispatch to compare one type
7101 against multiple other types, allowing e.g. `String` to be
7102 compared with `&str`.
7103 * `if let` and `while let` are no longer feature-gated.
7104 * Rust has adopted a more [uniform syntax for escaping unicode
7105 characters][unicode].
7106 * `macro_rules!` [has been declared stable][mac]. Though it is a
7107 flawed system it is sufficiently popular that it must be usable
7108 for 1.0. Effort has gone into [future-proofing][mac-future] it
7109 in ways that will allow other macro systems to be developed in
7110 parallel, and won't otherwise impact the evolution of the
7112 * The prelude has been [pared back significantly][prelude] such
7113 that it is the minimum necessary to support the most pervasive
7114 code patterns, and through [generalized where clauses][where]
7115 many of the prelude extension traits have been consolidated.
7116 * Rust's rudimentary reflection [has been removed][refl], as it
7117 incurred too much code generation for little benefit.
7118 * [Struct variants][structvars] are no longer feature-gated.
7119 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7120 known as 'higher-ranked trait bounds', this crucially allows
7121 unboxed closures to work.
7122 * Macros invocations surrounded by parens or square brackets and
7123 not terminated by a semicolon are [parsed as
7124 expressions][macros], which makes expressions like `vec![1i32,
7125 2, 3].len()` work as expected.
7126 * Trait objects now implement their traits automatically, and
7127 traits that can be coerced to objects now must be [object
7129 * Automatically deriving traits is now done with `#[derive(...)]`
7130 not `#[deriving(...)]` for [consistency with other naming
7131 conventions][derive].
7132 * Importing the containing module or enum at the same time as
7133 items or variants they contain is [now done with `self` instead
7134 of `mod`][self], as in use `foo::{self, bar}`
7135 * Glob imports are no longer feature-gated.
7136 * The `box` operator and `box` patterns have been feature-gated
7137 pending a redesign. For now unique boxes should be allocated
7138 like other containers, with `Box::new`.
7142 * A [series][coll1] of [efforts][coll2] to establish
7143 [conventions][coll3] for collections types has resulted in API
7144 improvements throughout the standard library.
7145 * New [APIs for error handling][err] provide ergonomic interop
7146 between error types, and [new conventions][err-conv] describe
7147 more clearly the recommended error handling strategies in Rust.
7148 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7149 it is easier to discuss failure in the context of error handling
7150 without making clarifications as to whether you are referring to
7151 the 'fail' macro or failure more generally.
7152 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7153 syscall when available.
7154 * The 'serialize' crate has been renamed 'rustc-serialize' and
7155 moved out of the distribution to Cargo. Although it is widely
7156 used now, it is expected to be superseded in the near future.
7157 * The `Show` formatter, typically implemented with
7158 `#[derive(Show)]` is [now requested with the `{:?}`
7159 specifier][show] and is intended for use by all types, for uses
7160 such as `println!` debugging. The new `String` formatter must be
7161 implemented by hand, uses the `{}` specifier, and is intended
7162 for full-fidelity conversions of things that can logically be
7163 represented as strings.
7167 * [Flexible target specification][flex] allows rustc's code
7168 generation to be configured to support otherwise-unsupported
7170 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7171 respective debuggers with Rust-appropriate pretty-printing.
7172 * The Windows installation of Rust is distributed with the
7173 MinGW components currently required to link binaries on that
7178 * Nullable enum optimizations have been extended to more types so
7179 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7180 space than the inner types themselves.
7181 * Work has begun on supporting AArch64.
7183 [Cargo]: https://crates.io
7184 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7185 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7186 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7187 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7188 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7189 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7190 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7191 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7192 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7193 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7194 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7195 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7196 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7197 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7198 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7199 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7200 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7201 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7202 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7203 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7204 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7205 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7206 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7207 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7208 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7209 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7210 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7211 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7212 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7213 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7214 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7215 [trpl]: https://doc.rust-lang.org/book/index.html
7216 [rbe]: http://rustbyexample.com/
7219 Version 0.12.0 (2014-10-09)
7220 =============================
7222 * ~1900 changes, numerous bugfixes
7226 * The introductory documentation (now called The Rust Guide) has
7227 been completely rewritten, as have a number of supplementary
7229 * Rust's package manager, Cargo, continues to improve and is
7230 sometimes considered to be quite awesome.
7231 * Many API's in `std` have been reviewed and updated for
7232 consistency with the in-development Rust coding
7233 guidelines. The standard library documentation tracks
7234 stabilization progress.
7235 * Minor libraries have been moved out-of-tree to the rust-lang org
7236 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7237 be installed with Cargo.
7238 * Lifetime elision allows lifetime annotations to be left off of
7239 function declarations in many common scenarios.
7240 * Rust now works on 64-bit Windows.
7243 * Indexing can be overloaded with the `Index` and `IndexMut`
7245 * The `if let` construct takes a branch only if the `let` pattern
7246 matches, currently behind the 'if_let' feature gate.
7247 * 'where clauses', a more flexible syntax for specifying trait
7248 bounds that is more aesthetic, have been added for traits and
7249 free functions. Where clauses will in the future make it
7250 possible to constrain associated types, which would be
7251 impossible with the existing syntax.
7252 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7253 the 'slicing_syntax' feature gate, and can be overloaded with
7254 the `Slice` or `SliceMut` traits.
7255 * The syntax for matching of sub-slices has been changed to use a
7256 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7257 consistency with other uses of `..` and to future-proof
7258 potential additional uses of the syntax.
7259 * The syntax for matching inclusive ranges in patterns has changed
7260 from `0..3` to `0...4` to be consistent with the exclusive range
7262 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7263 c]`) has been put behind the 'advanced_slice_patterns' feature
7264 gate and may be removed in the future.
7265 * Components of tuples and tuple structs can be extracted using
7266 the `value.0` syntax, currently behind the `tuple_indexing`
7268 * The `#[crate_id]` attribute is no longer supported; versioning
7269 is handled by the package manager.
7270 * Renaming crate imports are now written `extern crate foo as bar`
7271 instead of `extern crate bar = foo`.
7272 * Renaming use statements are now written `use foo as bar` instead
7274 * `let` and `match` bindings and argument names in macros are now
7276 * The new, more efficient, closure types ('unboxed closures') have
7277 been added under a feature gate, 'unboxed_closures'. These will
7278 soon replace the existing closure types, once higher-ranked
7279 trait lifetimes are added to the language.
7280 * `move` has been added as a keyword, for indicating closures
7281 that capture by value.
7282 * Mutation and assignment is no longer allowed in pattern guards.
7283 * Generic structs and enums can now have trait bounds.
7284 * The `Share` trait is now called `Sync` to free up the term
7285 'shared' to refer to 'shared reference' (the default reference
7287 * Dynamically-sized types have been mostly implemented,
7288 unifying the behavior of fat-pointer types with the rest of the
7290 * As part of dynamically-sized types, the `Sized` trait has been
7291 introduced, which qualifying types implement by default, and
7292 which type parameters expect by default. To specify that a type
7293 parameter does not need to be sized, write `<Sized? T>`. Most
7294 types are `Sized`, notable exceptions being unsized arrays
7295 (`[T]`) and trait types.
7296 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7297 * Lifetime bounds can now be applied to type parameters and object
7299 * The old, reference counted GC type, `Gc<T>` which was once
7300 denoted by the `@` sigil, has finally been removed. GC will be
7301 revisited in the future.
7304 * Library documentation has been improved for a number of modules.
7305 * Bit-vectors, collections::bitv has been modernized.
7306 * The url crate is deprecated in favor of
7307 http://github.com/servo/rust-url, which can be installed with
7309 * Most I/O stream types can be cloned and subsequently closed from
7311 * A `std::time::Duration` type has been added for use in I/O
7312 methods that rely on timers, as well as in the 'time' crate's
7313 `Timespec` arithmetic.
7314 * The runtime I/O abstraction layer that enabled the green thread
7315 scheduler to do non-thread-blocking I/O has been removed, along
7316 with the libuv-based implementation employed by the green thread
7317 scheduler. This will greatly simplify the future I/O work.
7318 * `collections::btree` has been rewritten to have a more
7319 idiomatic and efficient design.
7322 * rustdoc output now indicates the stability levels of API's.
7323 * The `--crate-name` flag can specify the name of the crate
7324 being compiled, like `#[crate_name]`.
7325 * The `-C metadata` specifies additional metadata to hash into
7326 symbol names, and `-C extra-filename` specifies additional
7327 information to put into the output filename, for use by the
7328 package manager for versioning.
7329 * debug info generation has continued to improve and should be
7330 more reliable under both gdb and lldb.
7331 * rustc has experimental support for compiling in parallel
7332 using the `-C codegen-units` flag.
7333 * rustc no longer encodes rpath information into binaries by
7337 * Stack usage has been optimized with LLVM lifetime annotations.
7338 * Official Rust binaries on Linux are more compatible with older
7339 kernels and distributions, built on CentOS 5.10.
7342 Version 0.11.0 (2014-07-02)
7343 ==========================
7345 * ~1700 changes, numerous bugfixes
7348 * ~[T] has been removed from the language. This type is superseded by
7350 * ~str has been removed from the language. This type is superseded by
7352 * ~T has been removed from the language. This type is superseded by the
7354 * @T has been removed from the language. This type is superseded by the
7355 standard library's std::gc::Gc<T> type.
7356 * Struct fields are now all private by default.
7357 * Vector indices and shift amounts are both required to be a `uint`
7358 instead of any integral type.
7359 * Byte character, byte string, and raw byte string literals are now all
7360 supported by prefixing the normal literal with a `b`.
7361 * Multiple ABIs are no longer allowed in an ABI string
7362 * The syntax for lifetimes on closures/procedures has been tweaked
7363 slightly: `<'a>|A, B|: 'b + K -> T`
7364 * Floating point modulus has been removed from the language; however it
7365 is still provided by a library implementation.
7366 * Private enum variants are now disallowed.
7367 * The `priv` keyword has been removed from the language.
7368 * A closure can no longer be invoked through a &-pointer.
7369 * The `use foo, bar, baz;` syntax has been removed from the language.
7370 * The transmute intrinsic no longer works on type parameters.
7371 * Statics now allow blocks/items in their definition.
7372 * Trait bounds are separated from objects with + instead of : now.
7373 * Objects can no longer be read while they are mutably borrowed.
7374 * The address of a static is now marked as insignificant unless the
7375 #[inline(never)] attribute is placed it.
7376 * The #[unsafe_destructor] attribute is now behind a feature gate.
7377 * Struct literals are no longer allowed in ambiguous positions such as
7378 if, while, match, and for..in.
7379 * Declaration of lang items and intrinsics are now feature-gated by
7381 * Integral literals no longer default to `int`, and floating point
7382 literals no longer default to `f64`. Literals must be suffixed with an
7383 appropriate type if inference cannot determine the type of the
7385 * The Box<T> type is no longer implicitly borrowed to &mut T.
7386 * Procedures are now required to not capture borrowed references.
7389 * The standard library is now a "facade" over a number of underlying
7390 libraries. This means that development on the standard library should
7391 be speedier due to smaller crates, as well as a clearer line between
7393 * A new library, libcore, lives under the standard library's facade
7394 which is Rust's "0-assumption" library, suitable for embedded and
7395 kernel development for example.
7396 * A regex crate has been added to the standard distribution. This crate
7397 includes statically compiled regular expressions.
7398 * The unwrap/unwrap_err methods on Result require a Show bound for
7399 better error messages.
7400 * The return types of the std::comm primitives have been centralized
7401 around the Result type.
7402 * A number of I/O primitives have gained the ability to time out their
7404 * A number of I/O primitives have gained the ability to close their
7405 reading/writing halves to cancel pending operations.
7406 * Reverse iterator methods have been removed in favor of `rev()` on
7407 their forward-iteration counterparts.
7408 * A bitflags! macro has been added to enable easy interop with C and
7409 management of bit flags.
7410 * A debug_assert! macro is now provided which is disabled when
7411 `--cfg ndebug` is passed to the compiler.
7412 * A graphviz crate has been added for creating .dot files.
7413 * The std::cast module has been migrated into std::mem.
7414 * The std::local_data api has been migrated from freestanding functions
7415 to being based on methods.
7416 * The Pod trait has been renamed to Copy.
7417 * jemalloc has been added as the default allocator for types.
7418 * The API for allocating memory has been changed to use proper alignment
7419 and sized deallocation
7420 * Connecting a TcpStream or binding a TcpListener is now based on a
7421 string address and a u16 port. This allows connecting to a hostname as
7423 * The Reader trait now contains a core method, read_at_least(), which
7424 correctly handles many repeated 0-length reads.
7425 * The process-spawning API is now centered around a builder-style
7427 * The :? printing qualifier has been moved from the standard library to
7428 an external libdebug crate.
7429 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
7430 have been renamed to Eq/Ord.
7431 * The select/plural methods have been removed from format!. The escapes
7432 for { and } have also changed from \{ and \} to {{ and }},
7434 * The TaskBuilder API has been re-worked to be a true builder, and
7435 extension traits for spawning native/green tasks have been added.
7438 * All breaking changes to the language or libraries now have their
7439 commit message annotated with `[breaking-change]` to allow for easy
7440 discovery of breaking changes.
7441 * The compiler will now try to suggest how to annotate lifetimes if a
7442 lifetime-related error occurs.
7443 * Debug info continues to be improved greatly with general bug fixes and
7444 better support for situations like link time optimization (LTO).
7445 * Usage of syntax extensions when cross-compiling has been fixed.
7446 * Functionality equivalent to GCC & Clang's -ffunction-sections,
7447 -fdata-sections and --gc-sections has been enabled by default
7448 * The compiler is now stricter about where it will load module files
7449 from when a module is declared via `mod foo;`.
7450 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
7451 Syntax extensions are now discovered via a "plugin registrar" type
7452 which will be extended in the future to other various plugins.
7453 * Lints have been restructured to allow for dynamically loadable lints.
7454 * A number of rustdoc improvements:
7455 * The HTML output has been visually redesigned.
7456 * Markdown is now powered by hoedown instead of sundown.
7457 * Searching heuristics have been greatly improved.
7458 * The search index has been reduced in size by a great amount.
7459 * Cross-crate documentation via `pub use` has been greatly improved.
7460 * Primitive types are now hyperlinked and documented.
7461 * Documentation has been moved from static.rust-lang.org/doc to
7463 * A new sandbox, play.rust-lang.org, is available for running and
7464 sharing rust code examples on-line.
7465 * Unused attributes are now more robustly warned about.
7466 * The dead_code lint now warns about unused struct fields.
7467 * Cross-compiling to iOS is now supported.
7468 * Cross-compiling to mipsel is now supported.
7469 * Stability attributes are now inherited by default and no longer apply
7470 to intra-crate usage, only inter-crate usage.
7471 * Error message related to non-exhaustive match expressions have been
7475 Version 0.10 (2014-04-03)
7476 =========================
7478 * ~1500 changes, numerous bugfixes
7481 * A new RFC process is now in place for modifying the language.
7482 * Patterns with `@`-pointers have been removed from the language.
7483 * Patterns with unique vectors (`~[T]`) have been removed from the
7485 * Patterns with unique strings (`~str`) have been removed from the
7487 * `@str` has been removed from the language.
7488 * `@[T]` has been removed from the language.
7489 * `@self` has been removed from the language.
7490 * `@Trait` has been removed from the language.
7491 * Headers on `~` allocations which contain `@` boxes inside the type for
7492 reference counting have been removed.
7493 * The semantics around the lifetimes of temporary expressions have changed,
7494 see #3511 and #11585 for more information.
7495 * Cross-crate syntax extensions are now possible, but feature gated. See
7496 #11151 for more information. This includes both `macro_rules!` macros as
7497 well as syntax extensions such as `format!`.
7498 * New lint modes have been added, and older ones have been turned on to be
7500 * Unnecessary parentheses
7503 * Uppercase variables
7504 * Publicly visible private types
7505 * `#[deriving]` with raw pointers
7506 * Unsafe functions can no longer be coerced to closures.
7507 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7508 * The `#[simd]` attribute is now behind a feature gate.
7509 * Visibility is no longer allowed on `extern crate` statements, and
7510 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7511 * Trailing commas are now allowed in argument lists and tuple patterns.
7512 * The `do` keyword has been removed, it is now a reserved keyword.
7513 * Default type parameters have been implemented, but are feature gated.
7514 * Borrowed variables through captures in closures are now considered soundly.
7515 * `extern mod` is now `extern crate`
7516 * The `Freeze` trait has been removed.
7517 * The `Share` trait has been added for types that can be shared among
7519 * Labels in macros are now hygienic.
7520 * Expression/statement macro invocations can be delimited with `{}` now.
7521 * Treatment of types allowed in `static mut` locations has been tweaked.
7522 * The `*` and `.` operators are now overloadable through the `Deref` and
7524 * `~Trait` and `proc` no longer have `Send` bounds by default.
7525 * Partial type hints are now supported with the `_` type marker.
7526 * An `Unsafe` type was introduced for interior mutability. It is now
7527 considered undefined to transmute from `&T` to `&mut T` without using the
7529 * The #[linkage] attribute was implemented for extern statics/functions.
7530 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7531 * `Pod` was renamed to `Copy`.
7534 * The `libextra` library has been removed. It has now been decomposed into
7535 component libraries with smaller and more focused nuggets of
7536 functionality. The full list of libraries can be found on the
7537 documentation index page.
7538 * std: `std::condition` has been removed. All I/O errors are now propagated
7539 through the `Result` type. In order to assist with error handling, a
7540 `try!` macro for unwrapping errors with an early return and a lint for
7541 unused results has been added. See #12039 for more information.
7542 * std: The `vec` module has been renamed to `slice`.
7543 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7544 This will become the only growable vector in the future.
7545 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7546 are now found at `std::io::BufferedReader` instead of
7547 `std::io::buffered::BufferedReader`.
7548 * std: `print` and `println` are no longer in the prelude, the `print!` and
7549 `println!` macros are intended to be used instead.
7550 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7551 attempts to statically prevent cycles.
7552 * std: The standard distribution is adopting the policy of pushing failure
7553 to the user rather than failing in libraries. Many functions (such as
7554 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7555 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7556 deriving mode: `#[deriving(Show)]`.
7557 * std: `ToStr` is now implemented for all types implementing `Show`.
7558 * std: The formatting trait methods now take `&self` instead of `&T`
7559 * std: The `invert()` method on iterators has been renamed to `rev()`
7560 * std: `std::num` has seen a reduction in the genericity of its traits,
7561 consolidating functionality into a few core traits.
7562 * std: Backtraces are now printed on task failure if the environment
7563 variable `RUST_BACKTRACE` is present.
7564 * std: Naming conventions for iterators have been standardized. More details
7565 can be found on the wiki's style guide.
7566 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7567 still implement the function.
7568 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7569 * std: `assert_approx_eq!` has been removed
7570 * std: The `e` and `E` formatting specifiers for floats have been added to
7571 print them in exponential notation.
7572 * std: The `Times` trait has been removed
7573 * std: Indications of variance and opting out of builtin bounds is done
7574 through marker types in `std::kinds::marker` now
7575 * std: `hash` has been rewritten, `IterBytes` has been removed, and
7576 `#[deriving(Hash)]` is now possible.
7577 * std: `SharedChan` has been removed, `Sender` is now cloneable.
7578 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
7579 * std: `Chan::new` is now `channel()`.
7580 * std: A new synchronous channel type has been implemented.
7581 * std: A `select!` macro is now provided for selecting over `Receiver`s.
7582 * std: `hashmap` and `trie` have been moved to `libcollections`
7583 * std: `run` has been rolled into `io::process`
7584 * std: `assert_eq!` now uses `{}` instead of `{:?}`
7585 * std: The equality and comparison traits have seen some reorganization.
7586 * std: `rand` has moved to `librand`.
7587 * std: `to_{lower,upper}case` has been implemented for `char`.
7588 * std: Logging has been moved to `liblog`.
7589 * collections: `HashMap` has been rewritten for higher performance and less
7591 * native: The default runtime is now `libnative`. If `libgreen` is desired,
7592 it can be booted manually. The runtime guide has more information and
7594 * native: All I/O functionality except signals has been implemented.
7595 * green: Task spawning with `libgreen` has been optimized with stack caching
7596 and various trimming of code.
7597 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
7598 * sync: The `extra::sync` module has been updated to modern rust (and moved
7599 to the `sync` library), tweaking and improving various interfaces while
7600 dropping redundant functionality.
7601 * sync: A new `Barrier` type has been added to the `sync` library.
7602 * sync: An efficient mutex for native and green tasks has been implemented.
7603 * serialize: The `base64` module has seen some improvement. It treats
7604 newlines better, has non-string error values, and has seen general
7606 * fourcc: A `fourcc!` macro was introduced
7607 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
7608 hexadecimal literal.
7611 * `rustpkg` has been deprecated and removed from the main repository. Its
7612 replacement, `cargo`, is under development.
7613 * Nightly builds of rust are now available
7614 * The memory usage of rustc has been improved many times throughout this
7616 * The build process supports disabling rpath support for the rustc binary
7618 * Code generation has improved in some cases, giving more information to the
7619 LLVM optimization passes to enable more extensive optimizations.
7620 * Debuginfo compatibility with lldb on OSX has been restored.
7621 * The master branch is now gated on an android bot, making building for
7622 android much more reliable.
7623 * Output flags have been centralized into one `--emit` flag.
7624 * Crate type flags have been centralized into one `--crate-type` flag.
7625 * Codegen flags have been consolidated behind a `-C` flag.
7626 * Linking against outdated crates now has improved error messages.
7627 * Error messages with lifetimes will often suggest how to annotate the
7628 function to fix the error.
7629 * Many more types are documented in the standard library, and new guides
7631 * Many `rustdoc` improvements:
7632 * code blocks are syntax highlighted.
7633 * render standalone markdown files.
7634 * the --test flag tests all code blocks by default.
7635 * exported macros are displayed.
7636 * re-exported types have their documentation inlined at the location of the
7638 * search works across crates that have been rendered to the same output
7642 Version 0.9 (2014-01-09)
7643 ==========================
7645 * ~1800 changes, numerous bugfixes
7648 * The `float` type has been removed. Use `f32` or `f64` instead.
7649 * A new facility for enabling experimental features (feature gating) has
7650 been added, using the crate-level `#[feature(foo)]` attribute.
7651 * Managed boxes (@) are now behind a feature gate
7652 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
7653 standard library's `Gc` or `Rc` types instead.
7654 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
7655 * Jumping back to the top of a loop is now done with `continue` instead of
7657 * Strings can no longer be mutated through index assignment.
7658 * Raw strings can be created via the basic `r"foo"` syntax or with matched
7659 hash delimiters, as in `r###"foo"###`.
7660 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
7662 * The `&fn` type is now written `|args| -> ret` to match the literal form.
7663 * `@fn`s have been removed.
7664 * `do` only works with procs in order to make it obvious what the cost
7666 * Single-element tuple-like structs can no longer be dereferenced to
7667 obtain the inner value. A more comprehensive solution for overloading
7668 the dereference operator will be provided in the future.
7669 * The `#[link(...)]` attribute has been replaced with
7670 `#[crate_id = "name#vers"]`.
7671 * Empty `impl`s must be terminated with empty braces and may not be
7672 terminated with a semicolon.
7673 * Keywords are no longer allowed as lifetime names; the `self` lifetime
7674 no longer has any special meaning.
7675 * The old `fmt!` string formatting macro has been removed.
7676 * `printf!` and `printfln!` (old-style formatting) removed in favor of
7677 `print!` and `println!`.
7678 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
7679 * The `extern mod foo (name = "bar")` syntax has been removed. Use
7680 `extern mod foo = "bar"` instead.
7681 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
7682 * Macros can have attributes.
7683 * Macros can expand to items with attributes.
7684 * Macros can expand to multiple items.
7685 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
7686 * Comments may be nested.
7687 * Values automatically coerce to trait objects they implement, without
7689 * Enum discriminants are no longer an entire word but as small as needed to
7690 contain all the variants. The `repr` attribute can be used to override
7691 the discriminant size, as in `#[repr(int)]` for integer-sized, and
7692 `#[repr(C)]` to match C enums.
7693 * Non-string literals are not allowed in attributes (they never worked).
7694 * The FFI now supports variadic functions.
7695 * Octal numeric literals, as in `0o7777`.
7696 * The `concat!` syntax extension performs compile-time string concatenation.
7697 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
7698 removed as Rust no longer uses segmented stacks.
7699 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
7700 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
7701 not `*`; ignoring remaining fields of a struct is also done with `..`,
7702 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
7703 * `rustc` supports the "win64" calling convention via `extern "win64"`.
7704 * `rustc` supports the "system" calling convention, which defaults to the
7705 preferred convention for the target platform, "stdcall" on 32-bit Windows,
7707 * The `type_overflow` lint (default: warn) checks literals for overflow.
7708 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
7709 * The `attribute_usage` lint (default: warn) warns about unknown
7711 * The `unknown_features` lint (default: warn) warns about unknown
7713 * The `dead_code` lint (default: warn) checks for dead code.
7714 * Rust libraries can be linked statically to one another
7715 * `#[link_args]` is behind the `link_args` feature gate.
7716 * Native libraries are now linked with `#[link(name = "foo")]`
7717 * Native libraries can be statically linked to a rust crate
7718 (`#[link(name = "foo", kind = "static")]`).
7719 * Native OS X frameworks are now officially supported
7720 (`#[link(name = "foo", kind = "framework")]`).
7721 * The `#[thread_local]` attribute creates thread-local (not task-local)
7722 variables. Currently behind the `thread_local` feature gate.
7723 * The `return` keyword may be used in closures.
7724 * Types that can be copied via a memcpy implement the `Pod` kind.
7725 * The `cfg` attribute can now be used on struct fields and enum variants.
7728 * std: The `option` and `result` API's have been overhauled to make them
7729 simpler, more consistent, and more composable.
7730 * std: The entire `std::io` module has been replaced with one that is
7731 more comprehensive and that properly interfaces with the underlying
7732 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
7734 * std: `io::util` contains a number of useful implementations of
7735 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
7736 `ZeroReader`, `TeeReader`.
7737 * std: The reference counted pointer type `extra::rc` moved into std.
7738 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
7739 just a wrapper around it).
7740 * std: The `Either` type has been removed.
7741 * std: `fmt::Default` can be implemented for any type to provide default
7742 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
7743 * std: The `rand` API continues to be tweaked.
7744 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
7745 on failure in gdb, is now named `rust_fail`.
7746 * std: The `each_key` and `each_value` methods on `HashMap` have been
7747 replaced by the `keys` and `values` iterators.
7748 * std: Functions dealing with type size and alignment have moved from the
7749 `sys` module to the `mem` module.
7750 * std: The `path` module was written and API changed.
7751 * std: `str::from_utf8` has been changed to cast instead of allocate.
7752 * std: `starts_with` and `ends_with` methods added to vectors via the
7753 `ImmutableEqVector` trait, which is in the prelude.
7754 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
7755 if the index is out of bounds.
7756 * std: Task failure no longer propagates between tasks, as the model was
7757 complex, expensive, and incompatible with thread-based tasks.
7758 * std: The `Any` type can be used for dynamic typing.
7759 * std: `~Any` can be passed to the `fail!` macro and retrieved via
7761 * std: Methods that produce iterators generally do not have an `_iter`
7763 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
7764 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
7765 * std: `util::ignore` renamed to `prelude::drop`.
7766 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
7768 * std: `vec::raw` has seen a lot of cleanup and API changes.
7769 * std: The standard library no longer includes any C++ code, and very
7770 minimal C, eliminating the dependency on libstdc++.
7771 * std: Runtime scheduling and I/O functionality has been factored out into
7772 extensible interfaces and is now implemented by two different crates:
7773 libnative, for native threading and I/O; and libgreen, for green threading
7774 and I/O. This paves the way for using the standard library in more limited
7775 embedded environments.
7776 * std: The `comm` module has been rewritten to be much faster, have a
7777 simpler, more consistent API, and to work for both native and green
7779 * std: All libuv dependencies have been moved into the rustuv crate.
7780 * native: New implementations of runtime scheduling on top of OS threads.
7781 * native: New native implementations of TCP, UDP, file I/O, process spawning,
7783 * green: The green thread scheduler and message passing types are almost
7785 * extra: The `flatpipes` module had bitrotted and was removed.
7786 * extra: All crypto functions have been removed and Rust now has a policy of
7787 not reimplementing crypto in the standard library. In the future crypto
7788 will be provided by external crates with bindings to established libraries.
7789 * extra: `c_vec` has been modernized.
7790 * extra: The `sort` module has been removed. Use the `sort` method on
7794 * The `rust` and `rusti` commands have been removed, due to lack of
7796 * `rustdoc` was completely rewritten.
7797 * `rustdoc` can test code examples in documentation.
7798 * `rustpkg` can test packages with the argument, 'test'.
7799 * `rustpkg` supports arbitrary dependencies, including C libraries.
7800 * `rustc`'s support for generating debug info is improved again.
7801 * `rustc` has better error reporting for unbalanced delimiters.
7802 * `rustc`'s JIT support was removed due to bitrot.
7803 * Executables and static libraries can be built with LTO (-Z lto)
7804 * `rustc` adds a `--dep-info` flag for communicating dependencies to
7808 Version 0.8 (2013-09-26)
7809 ============================
7811 * ~2200 changes, numerous bugfixes
7814 * The `for` loop syntax has changed to work with the `Iterator` trait.
7815 * At long last, unwinding works on Windows.
7816 * Default methods are ready for use.
7817 * Many trait inheritance bugs fixed.
7818 * Owned and borrowed trait objects work more reliably.
7819 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
7820 * rustc can omit emission of code for the `debug!` macro if it is passed
7822 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
7823 for foo.rs, then foo/mod.rs, and will generate an error when both are
7825 * Strings no longer contain trailing nulls. The new `std::c_str` module
7826 provides new mechanisms for converting to C strings.
7827 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
7828 * The FFI has been overhauled such that foreign functions are called directly,
7829 instead of through a stack-switching wrapper.
7830 * Calling a foreign function must be done through a Rust function with the
7831 `#[fixed_stack_segment]` attribute.
7832 * The `externfn!` macro can be used to declare both a foreign function and
7833 a `#[fixed_stack_segment]` wrapper at once.
7834 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
7835 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
7836 * `priv` is disallowed everywhere except for struct fields and enum variants.
7837 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
7838 * `ref` bindings in irrefutable patterns work correctly now.
7839 * `char` is now prevented from containing invalid code points.
7840 * Casting to `bool` is no longer allowed.
7841 * `\0` is now accepted as an escape in chars and strings.
7842 * `yield` is a reserved keyword.
7843 * `typeof` is a reserved keyword.
7844 * Crates may be imported by URL with `extern mod foo = "url";`.
7845 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
7846 * Static vectors can be initialized with repeating elements,
7847 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
7848 * Static structs can be initialized with functional record update,
7849 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
7850 * `cfg!` can be used to conditionally execute code based on the crate
7851 configuration, similarly to `#[cfg(...)]`.
7852 * The `unnecessary_qualification` lint detects unneeded module
7853 prefixes (default: allow).
7854 * Arithmetic operations have been implemented on the SIMD types in
7855 `std::unstable::simd`.
7856 * Exchange allocation headers were removed, reducing memory usage.
7857 * `format!` implements a completely new, extensible, and higher-performance
7858 string formatting system. It will replace `fmt!`.
7859 * `print!` and `println!` write formatted strings (using the `format!`
7860 extension) to stdout.
7861 * `write!` and `writeln!` write formatted strings (using the `format!`
7862 extension) to the new Writers in `std::rt::io`.
7863 * The library section in which a function or static is placed may
7864 be specified with `#[link_section = "..."]`.
7865 * The `proto!` syntax extension for defining bounded message protocols
7867 * `macro_rules!` is hygienic for `let` declarations.
7868 * The `#[export_name]` attribute specifies the name of a symbol.
7869 * `unreachable!` can be used to indicate unreachable code, and fails
7873 * std: Transitioned to the new runtime, written in Rust.
7874 * std: Added an experimental I/O library, `rt::io`, based on the new
7876 * std: A new generic `range` function was added to the prelude, replacing
7877 `uint::range` and friends.
7878 * std: `range_rev` no longer exists. Since range is an iterator it can be
7879 reversed with `range(lo, hi).invert()`.
7880 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
7881 renamed to `unwrap_or`.
7882 * std: The `iterator` module was renamed to `iter`.
7883 * std: Integral types now support the `checked_add`, `checked_sub`, and
7884 `checked_mul` operations for detecting overflow.
7885 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
7887 * std: Methods are standardizing on conventions for casting methods:
7888 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
7890 * std: The `CString` type in `c_str` provides new ways to convert to and
7892 * std: `DoubleEndedIterator` can yield elements in two directions.
7893 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
7895 * std: `str::from_bytes` renamed to `str::from_utf8`.
7896 * std: `pop_opt` and `shift_opt` methods added to vectors.
7897 * std: The task-local data interface no longer uses @, and keys are
7898 no longer function pointers.
7899 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
7900 * std: Added `SharedPort` to `comm`.
7901 * std: `Eq` has a default method for `ne`; only `eq` is required
7903 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
7904 is required in implementations.
7905 * std: `is_utf8` performance is improved, impacting many string functions.
7906 * std: `os::MemoryMap` provides cross-platform mmap.
7907 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
7908 are not 'in-bounds' are considered undefined.
7909 * std: Many freestanding functions in `vec` removed in favor of methods.
7910 * std: Many freestanding functions on scalar types removed in favor of
7912 * std: Many options to task builders were removed since they don't make
7913 sense in the new scheduler design.
7914 * std: More containers implement `FromIterator` so can be created by the
7916 * std: More complete atomic types in `unstable::atomics`.
7917 * std: `comm::PortSet` removed.
7918 * std: Mutating methods in the `Set` and `Map` traits have been moved into
7919 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
7920 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
7921 default implementations.
7922 * std: Various `from_str` functions were removed in favor of a generic
7923 `from_str` which is available in the prelude.
7924 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
7925 * extra: `dlist`, the doubly-linked list was modernized.
7926 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
7927 * extra: Added `glob` module, replacing `std::os::glob`.
7928 * extra: `rope` was removed.
7929 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
7930 * extra: `net`, and `timer` were removed. The experimental replacements
7931 are `std::rt::io::net` and `std::rt::io::timer`.
7932 * extra: Iterators implemented for `SmallIntMap`.
7933 * extra: Iterators implemented for `Bitv` and `BitvSet`.
7934 * extra: `SmallIntSet` removed. Use `BitvSet`.
7935 * extra: Performance of JSON parsing greatly improved.
7936 * extra: `semver` updated to SemVer 2.0.0.
7937 * extra: `term` handles more terminals correctly.
7938 * extra: `dbg` module removed.
7939 * extra: `par` module removed.
7940 * extra: `future` was cleaned up, with some method renames.
7941 * extra: Most free functions in `getopts` were converted to methods.
7944 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
7945 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
7946 similarly to gcc's `--march` flag.
7947 * rustc's performance compiling small crates is much better.
7948 * rustpkg has received many improvements.
7949 * rustpkg supports git tags as package IDs.
7950 * rustpkg builds into target-specific directories so it can be used for
7952 * The number of concurrent test tasks is controlled by the environment
7953 variable RUST_TEST_TASKS.
7954 * The test harness can now report metrics for benchmarks.
7955 * All tools have man pages.
7956 * Programs compiled with `--test` now support the `-h` and `--help` flags.
7957 * The runtime uses jemalloc for allocations.
7958 * Segmented stacks are temporarily disabled as part of the transition to
7959 the new runtime. Stack overflows are possible!
7960 * A new documentation backend, rustdoc_ng, is available for use. It is
7961 still invoked through the normal `rustdoc` command.
7964 Version 0.7 (2013-07-03)
7965 =======================
7967 * ~2000 changes, numerous bugfixes
7970 * `impl`s no longer accept a visibility qualifier. Put them on methods
7972 * The borrow checker has been rewritten with flow-sensitivity, fixing
7973 many bugs and inconveniences.
7974 * The `self` parameter no longer implicitly means `&'self self`,
7975 and can be explicitly marked with a lifetime.
7976 * Overloadable compound operators (`+=`, etc.) have been temporarily
7977 removed due to bugs.
7978 * The `for` loop protocol now requires `for`-iterators to return `bool`
7979 so they compose better.
7980 * The `Durable` trait is replaced with the `'static` bounds.
7981 * Trait default methods work more often.
7982 * Structs with the `#[packed]` attribute have byte alignment and
7983 no padding between fields.
7984 * Type parameters bound by `Copy` must now be copied explicitly with
7986 * It is now illegal to move out of a dereferenced unsafe pointer.
7987 * `Option<~T>` is now represented as a nullable pointer.
7988 * `@mut` does dynamic borrow checks correctly.
7989 * The `main` function is only detected at the topmost level of the crate.
7990 The `#[main]` attribute is still valid anywhere.
7991 * Struct fields may no longer be mutable. Use inherited mutability.
7992 * The `#[no_send]` attribute makes a type that would otherwise be
7994 * The `#[no_freeze]` attribute makes a type that would otherwise be
7996 * Unbounded recursion will abort the process after reaching the limit
7997 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
7998 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
7999 are never implicitly copyable.
8000 * `#[static_assert]` makes compile-time assertions about static bools.
8001 * At long last, 'argument modes' no longer exist.
8002 * The rarely used `use mod` statement no longer exists.
8005 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8007 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8008 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8010 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8011 and unsuffixed integer literals.
8014 * The `core` crate was renamed to `std`.
8015 * The `std` crate was renamed to `extra`.
8016 * More and improved documentation.
8017 * std: `iterator` module for external iterator objects.
8018 * Many old-style (internal, higher-order function) iterators replaced by
8019 implementations of `Iterator`.
8020 * std: Many old internal vector and string iterators,
8021 incl. `any`, `all`. removed.
8022 * std: The `finalize` method of `Drop` renamed to `drop`.
8023 * std: The `drop` method now takes `&mut self` instead of `&self`.
8024 * std: The prelude no longer re-exports any modules, only types and traits.
8025 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8026 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8027 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8028 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8029 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8030 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8031 * std: Many types implement `Clone`.
8032 * std: `path` type renamed to `Path`.
8033 * std: `mut` module and `Mut` type removed.
8034 * std: Many standalone functions removed in favor of methods and iterators
8035 in `vec`, `str`. In the future methods will also work as functions.
8036 * std: `reinterpret_cast` removed. Use `transmute`.
8037 * std: ascii string handling in `std::ascii`.
8038 * std: `Rand` is implemented for ~/@.
8039 * std: `run` module for spawning processes overhauled.
8040 * std: Various atomic types added to `unstable::atomic`.
8041 * std: Various types implement `Zero`.
8042 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8043 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8044 * std: Added `os::mkdir_recursive`.
8045 * std: Added `os::glob` function performs filesystems globs.
8046 * std: `FuzzyEq` renamed to `ApproxEq`.
8047 * std: `Map` now defines `pop` and `swap` methods.
8048 * std: `Cell` constructors converted to static methods.
8049 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8050 * extra: `flate` module moved from `std` to `extra`.
8051 * extra: `fileinput` module for iterating over a series of files.
8052 * extra: `Complex` number type and `complex` module.
8053 * extra: `Rational` number type and `rational` module.
8054 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8055 * extra: `term` uses terminfo now, is more correct.
8056 * extra: `arc` functions converted to methods.
8057 * extra: Implementation of fixed output size variations of SHA-2.
8060 * `unused_variables` lint mode for unused variables (default: warn).
8061 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8063 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8065 * `dead_assignment` lint mode for unread variables (default: warn).
8066 * `unnecessary_allocation` lint mode detects some heap allocations that are
8067 immediately borrowed so could be written without allocating (default: warn).
8068 * `missing_doc` lint mode (default: allow).
8069 * `unreachable_code` lint mode (default: warn).
8070 * The `rusti` command has been rewritten and a number of bugs addressed.
8071 * rustc outputs in color on more terminals.
8072 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8073 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8074 * Compiling with `-g` will make the binary record information about
8075 dynamic borrowcheck failures for debugging.
8076 * rustdoc has a nicer stylesheet.
8077 * Various improvements to rustdoc.
8078 * Improvements to rustpkg (see the detailed release notes).
8081 Version 0.6 (2013-04-03)
8082 ========================
8084 * ~2100 changes, numerous bugfixes
8087 * The self type parameter in traits is now spelled `Self`
8088 * The `self` parameter in trait and impl methods must now be explicitly
8089 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8090 * Static methods no longer require the `static` keyword and instead
8091 are distinguished by the lack of a `self` parameter
8092 * Replaced the `Durable` trait with the `'static` lifetime
8093 * The old closure type syntax with the trailing sigil has been
8094 removed in favor of the more consistent leading sigil
8095 * `super` is a keyword, and may be prefixed to paths
8096 * Trait bounds are separated with `+` instead of whitespace
8097 * Traits are implemented with `impl Trait for Type`
8098 instead of `impl Type: Trait`
8099 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8100 * The `export` keyword has finally been removed
8101 * The `move` keyword has been removed (see "Semantic changes")
8102 * The interior mutability qualifier on vectors, `[mut T]`, has been
8103 removed. Use `&mut [T]`, etc.
8104 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8105 * `fail` is no longer a keyword. Use `fail!()`
8106 * `assert` is no longer a keyword. Use `assert!()`
8107 * `log` is no longer a keyword. use `debug!`, etc.
8108 * 1-tuples may be represented as `(T,)`
8109 * Struct fields may no longer be `mut`. Use inherited mutability,
8110 `@mut T`, `core::mut` or `core::cell`
8111 * `extern mod { ... }` is no longer valid syntax for foreign
8112 function modules. Use extern blocks: `extern { ... }`
8113 * Newtype enums removed. Use tuple-structs.
8114 * Trait implementations no longer support visibility modifiers
8115 * Pattern matching over vectors improved and expanded
8116 * `const` renamed to `static` to correspond to lifetime name,
8117 and make room for future `static mut` unsafe mutable globals.
8118 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8119 * `Clone` implementations can be automatically generated with
8120 `#[deriving(Clone)]`
8121 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8122 instead of `foo as Bar`.
8123 * Fixed length vector types are now written as `[int, .. 3]`
8124 instead of `[int * 3]`.
8125 * Fixed length vector types can express the length as a constant
8126 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8129 * Types with owned pointers or custom destructors move by default,
8130 eliminating the `move` keyword
8131 * All foreign functions are considered unsafe
8132 * &mut is now unaliasable
8133 * Writes to borrowed @mut pointers are prevented dynamically
8135 * The name of the main function can be customized using #[main]
8136 * The default type of an inferred closure is &fn instead of @fn
8137 * `use` statements may no longer be "chained" - they cannot import
8138 identifiers imported by previous `use` statements
8139 * `use` statements are crate relative, importing from the "top"
8140 of the crate by default. Paths may be prefixed with `super::`
8141 or `self::` to change the search behavior.
8142 * Method visibility is inherited from the implementation declaration
8143 * Structural records have been removed
8144 * Many more types can be used in static items, including enums
8145 'static-lifetime pointers and vectors
8146 * Pattern matching over vectors improved and expanded
8147 * Typechecking of closure types has been overhauled to
8148 improve inference and eliminate unsoundness
8149 * Macros leave scope at the end of modules, unless that module is
8150 tagged with #[macro_escape]
8153 * Added big integers to `std::bigint`
8154 * Removed `core::oldcomm` module
8155 * Added pipe-based `core::comm` module
8156 * Numeric traits have been reorganized under `core::num`
8157 * `vec::slice` finally returns a slice
8158 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8159 * Containers reorganized around traits in `core::container`
8160 * `core::dvec` removed, `~[T]` is a drop-in replacement
8161 * `core::send_map` renamed to `core::hashmap`
8162 * `std::map` removed; replaced with `core::hashmap`
8163 * `std::treemap` reimplemented as an owned balanced tree
8164 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8165 * `core::trie` added as a fast ordered map for integer keys
8166 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8167 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8168 overload the comparison operators, whereas `TotalOrd` is used
8169 by certain container types
8172 * Replaced the 'cargo' package manager with 'rustpkg'
8173 * Added all-purpose 'rust' tool
8174 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8175 * rustc now *attempts* to offer spelling suggestions
8176 * Improved support for ARM and Android
8177 * Preliminary MIPS backend
8178 * Improved foreign function ABI implementation for x86, x86_64
8179 * Various memory usage improvements
8180 * Rust code may be embedded in foreign code under limited circumstances
8181 * Inline assembler supported by new asm!() syntax extension.
8184 Version 0.5 (2012-12-21)
8185 ===========================
8187 * ~900 changes, numerous bugfixes
8190 * Removed `<-` move operator
8191 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8192 * Removed old fixed length vector syntax - `[T]/N`
8193 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8194 * Macros may now expand to items and statements
8195 * `a.b()` is always parsed as a method call, never as a field projection
8196 * `Eq` and `IterBytes` implementations can be automatically generated
8197 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8198 * Removed the special crate language for `.rc` files
8199 * Function arguments may consist of any irrefutable pattern
8202 * `&` and `~` pointers may point to objects
8203 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8204 * Enum variants may be structs
8205 * Destructors can be added to all nominal types with the Drop trait
8206 * Structs and nullary enum variants may be constants
8207 * Values that cannot be implicitly copied are now automatically moved
8208 without writing `move` explicitly
8209 * `&T` may now be coerced to `*T`
8210 * Coercions happen in `let` statements as well as function calls
8211 * `use` statements now take crate-relative paths
8212 * The module and type namespaces have been merged so that static
8213 method names can be resolved under the trait in which they are
8216 * Improved support for language features
8217 * Trait inheritance works in many scenarios
8218 * More support for explicit self arguments in methods - `self`, `&self`
8219 `@self`, and `~self` all generally work as expected
8220 * Static methods work in more situations
8221 * Experimental: Traits may declare default methods for the implementations
8225 * New condition handling system in `core::condition`
8226 * Timsort added to `std::sort`
8227 * New priority queue, `std::priority_queue`
8228 * Pipes for serializable types, `std::flatpipes'
8229 * Serialization overhauled to be trait-based
8230 * Expanded `getopts` definitions
8231 * Moved futures to `std`
8232 * More functions are pure now
8233 * `core::comm` renamed to `oldcomm`. Still deprecated
8234 * `rustdoc` and `cargo` are libraries now
8237 * Added a preliminary REPL, `rusti`
8238 * License changed from MIT to dual MIT/APL2
8241 Version 0.4 (2012-10-15)
8242 ==========================
8244 * ~2000 changes, numerous bugfixes
8247 * All keywords are now strict and may not be used as identifiers anywhere
8248 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8249 'of', 'with', 'to', 'class'.
8250 * Classes are replaced with simpler structs
8251 * Explicit method self types
8252 * `ret` became `return` and `alt` became `match`
8253 * `import` is now `use`; `use is now `extern mod`
8254 * `extern mod { ... }` is now `extern { ... }`
8255 * `use mod` is the recommended way to import modules
8256 * `pub` and `priv` replace deprecated export lists
8257 * The syntax of `match` pattern arms now uses fat arrow (=>)
8258 * `main` no longer accepts an args vector; use `os::args` instead
8261 * Trait implementations are now coherent, ala Haskell typeclasses
8262 * Trait methods may be static
8263 * Argument modes are deprecated
8264 * Borrowed pointers are much more mature and recommended for use
8265 * Strings and vectors in the static region are stored in constant memory
8266 * Typestate was removed
8267 * Resolution rewritten to be more reliable
8268 * Support for 'dual-mode' data structures (freezing and thawing)
8271 * Most binary operators can now be overloaded via the traits in
8273 * `std::net::url` for representing URLs
8274 * Sendable hash maps in `core::send_map`
8275 * `core::task' gained a (currently unsafe) task-local storage API
8278 * An efficient new intertask communication primitive called the pipe,
8279 along with a number of higher-level channel types, in `core::pipes`
8280 * `std::arc`, an atomically reference counted, immutable, shared memory
8282 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8283 * Futures are now based on pipes and sendable
8284 * More robust linked task failure
8285 * Improved task builder API
8288 * Improved error reporting
8289 * Preliminary JIT support
8290 * Preliminary work on precise GC
8291 * Extensive architectural improvements to rustc
8292 * Begun a transition away from buggy C++-based reflection (shape) code to
8293 Rust-based (visitor) code
8294 * All hash functions and tables converted to secure, randomized SipHash
8297 Version 0.3 (2012-07-12)
8298 ========================
8300 * ~1900 changes, numerous bugfixes
8302 * New coding conveniences
8303 * Integer-literal suffix inference
8304 * Per-item control over warnings, errors
8305 * #[cfg(windows)] and #[cfg(unix)] attributes
8306 * Documentation comments
8307 * More compact closure syntax
8308 * 'do' expressions for treating higher-order functions as
8310 * *-patterns (wildcard extended to all constructor fields)
8313 * Name resolution pass and exhaustiveness checker rewritten
8314 * Region pointers and borrow checking supersede alias
8316 * Init-ness checking is now provided by a region-based liveness
8317 pass instead of the typestate pass; same for last-use analysis
8318 * Extensive work on region pointers
8320 * Experimental new language features
8321 * Slices and fixed-size, interior-allocated vectors
8322 * #!-comments for lang versioning, shell execution
8323 * Destructors and iface implementation for classes;
8324 type-parameterized classes and class methods
8325 * 'const' type kind for types that can be used to implement
8326 shared-memory concurrency patterns
8330 * Removal of various obsolete features
8331 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8332 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8334 * Constructs: do-while loops ('do' repurposed), fn binding,
8335 resources (replaced by destructors)
8337 * Compiler reorganization
8338 * Syntax-layer of compiler split into separate crate
8339 * Clang (from LLVM project) integrated into build
8340 * Typechecker split into sub-modules
8343 * New time functions
8344 * Extension methods for many built-in types
8345 * Arc: atomic-refcount read-only / exclusive-use shared cells
8346 * Par: parallel map and search routines
8347 * Extensive work on libuv interface
8348 * Much vector code moved to libraries
8349 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8350 #include, #include_str, #include_bin
8353 * Cargo automatically resolves dependencies
8356 Version 0.2 (2012-03-29)
8357 =========================
8359 * >1500 changes, numerous bugfixes
8361 * New docs and doc tooling
8363 * New port: FreeBSD x86_64
8365 * Compilation model enhancements
8366 * Generics now specialized, multiply instantiated
8367 * Functions now inlined across separate crates
8369 * Scheduling, stack and threading fixes
8370 * Noticeably improved message-passing performance
8371 * Explicit schedulers
8375 * Experimental new language features
8376 * Operator overloading
8380 * Various language extensions
8381 * C-callback function types: 'crust fn ...'
8382 * Infinite-loop construct: 'loop { ... }'
8383 * Shorten 'mutable' to 'mut'
8384 * Required mutable-local qualifier: 'let mut ...'
8385 * Basic glob-exporting: 'export foo::*;'
8386 * Alt now exhaustive, 'alt check' for runtime-checked
8387 * Block-function form of 'for' loop, with 'break' and 'ret'.
8390 * AST quasi-quote syntax extension
8391 * Revived libuv interface
8392 * New modules: core::{future, iter}, std::arena
8393 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8394 * Extensive cleanup, regularization in libstd, libcore
8397 Version 0.1 (2012-01-20)
8398 ===============================
8400 * Most language features work, including:
8401 * Unique pointers, unique closures, move semantics
8402 * Interface-constrained generics
8403 * Static interface dispatch
8405 * Multithread task scheduling
8406 * Typestate predicates
8407 * Failure unwinding, destructors
8408 * Pattern matching and destructuring assignment
8409 * Lightweight block-lambda syntax
8410 * Preliminary macro-by-example
8412 * Compiler works with the following configurations:
8413 * Linux: x86 and x86_64 hosts and targets
8414 * macOS: x86 and x86_64 hosts and targets
8415 * Windows: x86 hosts and targets
8417 * Cross compilation / multi-target configuration supported.
8419 * Preliminary API-documentation and package-management tools included.
8423 * Documentation is incomplete.
8425 * Performance is below intended target.
8427 * Standard library APIs are subject to extensive change, reorganization.
8429 * Language-level versioning is not yet operational - future code will