1 Version 1.43.1 (2020-05-07)
2 ===========================
4 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
5 * [Fixed the stabilization of AVX-512 features.][71473]
6 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
8 [71430]: https://github.com/rust-lang/rust/pull/71430
9 [71473]: https://github.com/rust-lang/rust/issues/71473
10 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
13 Version 1.43.0 (2020-04-23)
14 ==========================
18 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
19 the type inferred correctly.][68129]
20 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
22 **Syntax only changes**
23 - [Allow `type Foo: Ord` syntactically.][69361]
24 - [Fuse associated and extern items up to defaultness.][69194]
25 - [Syntactically allow `self` in all `fn` contexts.][68764]
26 - [Merge `fn` syntax + cleanup item parsing.][68728]
27 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
28 For example, you may now write:
30 macro_rules! mac_trait {
40 These are still rejected *semantically*, so you will likely receive an error but
41 these changes can be seen and parsed by macros and
42 conditional compilation.
47 - [You can now pass multiple lint flags to rustc to override the previous
48 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
49 everything in the `unused` lint group except `unused-variables` which
50 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
51 everything in the `unused` lint group **including** `unused-variables` since
52 the allow flag is specified before the deny flag (and therefore overridden).
53 - [rustc will now prefer your system MinGW libraries over its bundled libraries
54 if they are available on `windows-gnu`.][67429]
55 - [rustc now buffers errors/warnings printed in JSON.][69227]
59 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
60 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
61 respectively.][69538] **Note** These conversions are only available when `N`
63 - [You can now use associated constants on floats and integers directly, rather
64 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
65 `f32::NAN` with no imports.
66 - [`u8::is_ascii` is now `const`.][68984]
67 - [`String` now implements `AsMut<str>`.][68742]
68 - [Added the `primitive` module to `std` and `core`.][67637] This module
69 reexports Rust's primitive types. This is mainly useful in macros
70 where you want avoid these types being shadowed.
71 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
72 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
76 - [`Once::is_completed`]
85 - [You can now set config `[profile]`s in your `.cargo/config`, or through
86 your environment.][cargo/7823]
87 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
88 executable path when running integration tests or benchmarks.][cargo/7697]
89 `<name>` is the name of your binary as-is e.g. If you wanted the executable
90 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
94 - [Certain checks in the `const_err` lint were deemed unrelated to const
95 evaluation][69185], and have been moved to the `unconditional_panic` and
96 `arithmetic_overflow` lints.
101 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
102 has been a warning since 1.36.0.
103 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
104 led to some instances being accepted, and now correctly emits a hard error.
106 [69340]: https://github.com/rust-lang/rust/pull/69340
110 These changes provide no direct user facing benefits, but represent significant
111 improvements to the internals and overall performance of `rustc` and
114 - [All components are now built with `opt-level=3` instead of `2`.][67878]
115 - [Improved how rustc generates drop code.][67332]
116 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
117 - [traits: preallocate 2 Vecs of known initial size][69022]
118 - [Avoid exponential behaviour when relating types][68772]
119 - [Skip `Drop` terminators for enum variants without drop glue][68943]
120 - [Improve performance of coherence checks][68966]
121 - [Deduplicate types in the generator witness][68672]
122 - [Invert control in struct_lint_level.][68725]
124 [67332]: https://github.com/rust-lang/rust/pull/67332/
125 [67429]: https://github.com/rust-lang/rust/pull/67429/
126 [67637]: https://github.com/rust-lang/rust/pull/67637/
127 [67642]: https://github.com/rust-lang/rust/pull/67642/
128 [67878]: https://github.com/rust-lang/rust/pull/67878/
129 [67885]: https://github.com/rust-lang/rust/pull/67885/
130 [68129]: https://github.com/rust-lang/rust/pull/68129/
131 [68672]: https://github.com/rust-lang/rust/pull/68672/
132 [68725]: https://github.com/rust-lang/rust/pull/68725/
133 [68728]: https://github.com/rust-lang/rust/pull/68728/
134 [68738]: https://github.com/rust-lang/rust/pull/68738/
135 [68742]: https://github.com/rust-lang/rust/pull/68742/
136 [68764]: https://github.com/rust-lang/rust/pull/68764/
137 [68772]: https://github.com/rust-lang/rust/pull/68772/
138 [68943]: https://github.com/rust-lang/rust/pull/68943/
139 [68952]: https://github.com/rust-lang/rust/pull/68952/
140 [68966]: https://github.com/rust-lang/rust/pull/68966/
141 [68984]: https://github.com/rust-lang/rust/pull/68984/
142 [69022]: https://github.com/rust-lang/rust/pull/69022/
143 [69185]: https://github.com/rust-lang/rust/pull/69185/
144 [69194]: https://github.com/rust-lang/rust/pull/69194/
145 [69201]: https://github.com/rust-lang/rust/pull/69201/
146 [69227]: https://github.com/rust-lang/rust/pull/69227/
147 [69548]: https://github.com/rust-lang/rust/pull/69548/
148 [69256]: https://github.com/rust-lang/rust/pull/69256/
149 [69361]: https://github.com/rust-lang/rust/pull/69361/
150 [69366]: https://github.com/rust-lang/rust/pull/69366/
151 [69538]: https://github.com/rust-lang/rust/pull/69538/
152 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
153 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
154 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
155 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
156 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
157 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
158 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
159 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
162 Version 1.42.0 (2020-03-12)
163 ==========================
167 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
169 fn foo(words: &[&str]) {
171 ["Hello", "World", "!", ..] => println!("Hello World!"),
172 ["Foo", "Bar", ..] => println!("Baz"),
173 rest => println!("{:?}", rest),
177 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
178 that you can create an enum that has the exact layout and ABI of the type
180 - [There are some *syntax-only* changes:][67131]
181 - `default` is syntactically allowed before items in `trait` definitions.
182 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
183 leave out their bodies in favor of `;`.
184 - Bounds on associated types in `impl`s are now syntactically allowed
185 (e.g. `type Foo: Ord;`).
186 - `...` (the C-variadic type) may occur syntactically directly as the type of
187 any function parameter.
189 These are still rejected *semantically*, so you will likely receive an error
190 but these changes can be seen and parsed by procedural macros and
191 conditional compilation.
195 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
196 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
197 - [`Option::{expect,unwrap}` and
198 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
199 pointing to the location where they were called, rather than
200 `core`'s internals. ][67887]
202 \* Refer to Rust's [platform support page][forge-platform-support] for more
203 information on Rust's tiered platform support.
207 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
208 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
209 to implement `Sized`.][67935]
210 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
211 - [`Layout::new` is now `const`.][66254]
212 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
217 - [`CondVar::wait_while`]
218 - [`CondVar::wait_timeout_while`]
220 - [`DebugMap::value`]
221 - [`ManuallyDrop::take`]
223 - [`ptr::slice_from_raw_parts_mut`]
224 - [`ptr::slice_from_raw_parts`]
228 - [You no longer need to include `extern crate proc_macro;` to be able to
229 `use proc_macro;` in the `2018` edition.][cargo/7700]
233 - [`Error::description` has been deprecated, and its use will now produce a
234 warning.][66919] It's recommended to use `Display`/`to_string` instead.
236 [68253]: https://github.com/rust-lang/rust/pull/68253/
237 [68348]: https://github.com/rust-lang/rust/pull/68348/
238 [67935]: https://github.com/rust-lang/rust/pull/67935/
239 [68339]: https://github.com/rust-lang/rust/pull/68339/
240 [68122]: https://github.com/rust-lang/rust/pull/68122/
241 [67712]: https://github.com/rust-lang/rust/pull/67712/
242 [67887]: https://github.com/rust-lang/rust/pull/67887/
243 [67131]: https://github.com/rust-lang/rust/pull/67131/
244 [67233]: https://github.com/rust-lang/rust/pull/67233/
245 [66899]: https://github.com/rust-lang/rust/pull/66899/
246 [66919]: https://github.com/rust-lang/rust/pull/66919/
247 [66254]: https://github.com/rust-lang/rust/pull/66254/
248 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
249 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
250 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
251 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
252 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
253 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
254 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
255 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
256 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
259 Version 1.41.1 (2020-02-27)
260 ===========================
262 * [Always check types of static items][69145]
263 * [Always check lifetime bounds of `Copy` impls][69145]
264 * [Fix miscompilation in callers of `Layout::repeat`][69225]
266 [69225]: https://github.com/rust-lang/rust/issues/69225
267 [69145]: https://github.com/rust-lang/rust/pull/69145
270 Version 1.41.0 (2020-01-30)
271 ===========================
276 - [You can now pass type parameters to foreign items when implementing
277 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
278 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
279 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
280 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
281 - [You can now use any valid identifier in a `format_args` macro.][66847]
282 Previously identifiers starting with an underscore were not allowed.
283 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
284 enum variants.][66183] These are still rejected semantically, but
285 can be seen and parsed by procedural macros and conditional compilation.
290 - [Rustc will now warn if you have unused loop `'label`s.][66325]
291 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
292 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
293 - [You can now pass an arguments file passing the `@path` syntax
294 to rustc.][66172] Note that the format differs somewhat from what is
295 found in other tooling; please see [the documentation][argfile-docs] for
297 - [You can now provide `--extern` flag without a path, indicating that it is
298 available from the search path or specified with an `-L` flag.][64882]
300 \* Refer to Rust's [platform support page][forge-platform-support] for more
301 information on Rust's tiered platform support.
303 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
308 - [The `core::panic` module is now stable.][66771] It was already stable
310 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
311 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
312 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
318 - [`Result::map_or_else`]
319 - [`std::rc::Weak::weak_count`]
320 - [`std::rc::Weak::strong_count`]
321 - [`std::sync::Weak::weak_count`]
322 - [`std::sync::Weak::strong_count`]
327 - [Cargo will now document all the private items for binary crates
328 by default.][cargo/7593]
329 - [`cargo-install` will now reinstall the package if it detects that it is out
330 of date.][cargo/7560]
331 - [Cargo.lock now uses a more git friendly format that should help to reduce
332 merge conflicts.][cargo/7579]
333 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
334 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
335 optimisation level to `2` for debug builds. You can also use
336 `[profile.<profile>.build-override]` to override build scripts and
342 - [You can now specify `edition` in documentation code blocks to compile the block
343 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
344 should be compiled the 2018 edition of Rust.
345 - [You can now provide custom themes to rustdoc with `--theme`, and check the
346 current theme with `--check-theme`.][54733]
347 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
352 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
353 Apple targets.][apple-32bit-drop] This means that the source code is still
354 available to build, but the targets are no longer being tested and release
355 binaries for those platforms will no longer be distributed by the Rust project.
356 Please refer to the linked blog post for more information.
358 [54733]: https://github.com/rust-lang/rust/pull/54733/
359 [61351]: https://github.com/rust-lang/rust/pull/61351/
360 [67255]: https://github.com/rust-lang/rust/pull/67255/
361 [66661]: https://github.com/rust-lang/rust/pull/66661/
362 [66771]: https://github.com/rust-lang/rust/pull/66771/
363 [66847]: https://github.com/rust-lang/rust/pull/66847/
364 [66238]: https://github.com/rust-lang/rust/pull/66238/
365 [66277]: https://github.com/rust-lang/rust/pull/66277/
366 [66325]: https://github.com/rust-lang/rust/pull/66325/
367 [66172]: https://github.com/rust-lang/rust/pull/66172/
368 [66183]: https://github.com/rust-lang/rust/pull/66183/
369 [65879]: https://github.com/rust-lang/rust/pull/65879/
370 [65013]: https://github.com/rust-lang/rust/pull/65013/
371 [64882]: https://github.com/rust-lang/rust/pull/64882/
372 [64325]: https://github.com/rust-lang/rust/pull/64325/
373 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
374 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
375 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
376 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
377 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
378 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
379 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
380 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
381 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
382 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
383 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
385 Version 1.40.0 (2019-12-19)
386 ===========================
390 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
391 `const` contexts.][65188] e.g.
394 pub struct Point(i32, i32);
396 const ORIGIN: Point = {
397 let constructor = Point;
403 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
404 indicate that there may be variants or fields added in the future.][64639]
405 For example this requires adding a wild-card branch (`_ => {}`) to any match
406 statements on a non-exhaustive `enum`. [(RFC 2008)]
407 - [You can now use function-like procedural macros in `extern` blocks and in
408 type positions.][63931] e.g. `type Generated = macro!();`
409 - [Function-like and attribute procedural macros can now emit
410 `macro_rules!` items, so you can now have your macros generate macros.][64035]
411 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
412 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
413 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
417 - [Added tier 3 support\* for the
418 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
419 - [Added tier 3 support for the
420 `aarch64-unknown-none-softfloat` target.][64589]
421 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
422 `mips64el-unknown-linux-muslabi64` targets.][65843]
424 \* Refer to Rust's [platform support page][forge-platform-support] for more
425 information on Rust's tiered platform support.
429 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
433 - [`BTreeMap::get_key_value`]
434 - [`HashMap::get_key_value`]
435 - [`Option::as_deref_mut`]
436 - [`Option::as_deref`]
437 - [`Option::flatten`]
438 - [`UdpSocket::peer_addr`]
439 - [`f32::to_be_bytes`]
440 - [`f32::to_le_bytes`]
441 - [`f32::to_ne_bytes`]
442 - [`f64::to_be_bytes`]
443 - [`f64::to_le_bytes`]
444 - [`f64::to_ne_bytes`]
445 - [`f32::from_be_bytes`]
446 - [`f32::from_le_bytes`]
447 - [`f32::from_ne_bytes`]
448 - [`f64::from_be_bytes`]
449 - [`f64::from_le_bytes`]
450 - [`f64::from_ne_bytes`]
457 - [Cargo will now always display warnings, rather than only on
458 fresh builds.][cargo/7450]
459 - [Feature flags (except `--all-features`) passed to a virtual workspace will
460 now produce an error.][cargo/7507] Previously these flags were ignored.
461 - [You can now publish `dev-dependencies` without including
462 a `version`.][cargo/7333]
466 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
467 when running documentation tests with `rustdoc`.][63803]
471 - [As previously announced, any previous NLL warnings in the 2015 edition are
472 now hard errors.][64221]
473 - [The `include!` macro will now warn if it failed to include the
474 entire file.][64284] The `include!` macro unintentionally only includes the
475 first _expression_ in a file, and this can be unintuitive. This will become
476 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
477 - [Using `#[inline]` on function prototypes and consts now emits a warning under
478 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
479 or `extern` blocks now correctly emits a hard error.
481 [65294]: https://github.com/rust-lang/rust/pull/65294/
482 [66103]: https://github.com/rust-lang/rust/pull/66103/
483 [65843]: https://github.com/rust-lang/rust/pull/65843/
484 [65188]: https://github.com/rust-lang/rust/pull/65188/
485 [65092]: https://github.com/rust-lang/rust/pull/65092/
486 [64589]: https://github.com/rust-lang/rust/pull/64589/
487 [64639]: https://github.com/rust-lang/rust/pull/64639/
488 [64221]: https://github.com/rust-lang/rust/pull/64221/
489 [64284]: https://github.com/rust-lang/rust/pull/64284/
490 [63931]: https://github.com/rust-lang/rust/pull/63931/
491 [64035]: https://github.com/rust-lang/rust/pull/64035/
492 [63674]: https://github.com/rust-lang/rust/pull/63674/
493 [63803]: https://github.com/rust-lang/rust/pull/63803/
494 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
495 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
496 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
497 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
498 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
499 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
500 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
501 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
502 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
503 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
504 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
505 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
506 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
507 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
508 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
509 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
510 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
511 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
512 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
513 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
514 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
515 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
516 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
517 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
518 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
519 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
522 Version 1.39.0 (2019-11-07)
523 ===========================
527 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
528 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
529 - [You can now use certain attributes on function, closure, and function pointer
530 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
531 `deny`, `forbid` as well as inert helper attributes used by procedural macro
532 attributes applied to items. e.g.
535 #[cfg(windows)] slice: &[u16],
536 #[cfg(not(windows))] slice: &[u8],
541 - [You can now take shared references to bind-by-move patterns in the `if` guards
542 of `match` arms.][63118] e.g.
545 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
549 // ---- `nums` is bound by move.
550 if nums.iter().sum::<u8>() == 10
551 // ^------ `.iter()` implicitly takes a reference to `nums`.
554 // ----------- Legal as `nums` was bound by move and so we have ownership.
565 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
566 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
567 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
568 **Note** Cargo currently doesn't use this feature. Refer to
569 [cargo#7315][cargo/7315] to track this feature's progress.
570 - [You can now pass `--show-output` argument to test binaries to print the
571 output of successful tests.][62600]
574 \* Refer to Rust's [platform support page][forge-platform-support] for more
575 information on Rust's tiered platform support.
579 - [`Vec::new` and `String::new` are now `const` functions.][64028]
580 - [`LinkedList::new` is now a `const` function.][63684]
581 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
582 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
587 - [`Pin::into_inner`]
588 - [`Instant::checked_duration_since`]
589 - [`Instant::saturating_duration_since`]
593 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
594 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
595 `--all` is now deprecated.
599 - [You can now pass `-Clinker` to rustdoc to control the linker used
600 for compiling doctests.][63834]
604 - [Code that was previously accepted by the old borrow checker, but rejected by
605 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
606 previously a warning, and will also become a hard error in the Rust 2015
607 edition in the 1.40.0 release.
608 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
609 run tests.][63827] This should improve performance when running a large
611 - [The `try!` macro will now issue a deprecation warning.][62672] It is
612 recommended to use the `?` operator instead.
613 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
616 [62600]: https://github.com/rust-lang/rust/pull/62600/
617 [62672]: https://github.com/rust-lang/rust/pull/62672/
618 [63118]: https://github.com/rust-lang/rust/pull/63118/
619 [63209]: https://github.com/rust-lang/rust/pull/63209/
620 [63402]: https://github.com/rust-lang/rust/pull/63402/
621 [63565]: https://github.com/rust-lang/rust/pull/63565/
622 [63595]: https://github.com/rust-lang/rust/pull/63595/
623 [63684]: https://github.com/rust-lang/rust/pull/63684/
624 [63698]: https://github.com/rust-lang/rust/pull/63698/
625 [63770]: https://github.com/rust-lang/rust/pull/63770/
626 [63786]: https://github.com/rust-lang/rust/pull/63786/
627 [63827]: https://github.com/rust-lang/rust/pull/63827/
628 [63834]: https://github.com/rust-lang/rust/pull/63834/
629 [63927]: https://github.com/rust-lang/rust/pull/63927/
630 [63933]: https://github.com/rust-lang/rust/pull/63933/
631 [63934]: https://github.com/rust-lang/rust/pull/63934/
632 [63938]: https://github.com/rust-lang/rust/pull/63938/
633 [63940]: https://github.com/rust-lang/rust/pull/63940/
634 [63941]: https://github.com/rust-lang/rust/pull/63941/
635 [63945]: https://github.com/rust-lang/rust/pull/63945/
636 [64010]: https://github.com/rust-lang/rust/pull/64010/
637 [64028]: https://github.com/rust-lang/rust/pull/64028/
638 [64334]: https://github.com/rust-lang/rust/pull/64334/
639 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
640 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
641 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
642 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
643 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
644 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
646 Version 1.38.0 (2019-09-26)
647 ==========================
651 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
652 - [The `#[deprecated]` attribute can now be used on macros.][62042]
656 - [Added pipelined compilation support to `rustc`.][62766] This will
657 improve compilation times in some cases. For further information please refer
658 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
659 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
660 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
661 `x86_64-uwp-windows-msvc` targets.][60260]
662 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
663 `armv7-unknown-linux-musleabi` targets.][63107]
664 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
665 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
667 \* Refer to Rust's [platform support page][forge-platform-support] for more
668 information on Rust's tiered platform support.
672 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
673 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
674 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
675 is available at `std::clone::Clone`). This also makes all built-in macros
676 available in `std`/`core` root. e.g. `std::include_bytes!`.
677 - [`str::Chars` now implements `Debug`.][63000]
678 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
679 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
680 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
681 - [Added euclidean remainder and division operations (`div_euclid`,
682 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
683 `overflowing`, and `wrapping` versions are available for all
685 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
687 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
691 - [`<*const T>::cast`]
693 - [`Duration::as_secs_f32`]
694 - [`Duration::as_secs_f64`]
695 - [`Duration::div_f32`]
696 - [`Duration::div_f64`]
697 - [`Duration::from_secs_f32`]
698 - [`Duration::from_secs_f64`]
699 - [`Duration::mul_f32`]
700 - [`Duration::mul_f64`]
705 - [Added pipelined compilation support to `cargo`.][cargo/7143]
706 - [You can now pass the `--features` option multiple times to enable
707 multiple features.][cargo/7084]
711 - [`rustc` will now warn about some incorrect uses of
712 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
716 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
718 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
719 issues][62896] with certain crates such as libc.
721 [60260]: https://github.com/rust-lang/rust/pull/60260/
722 [61457]: https://github.com/rust-lang/rust/pull/61457/
723 [61491]: https://github.com/rust-lang/rust/pull/61491/
724 [61884]: https://github.com/rust-lang/rust/pull/61884/
725 [61953]: https://github.com/rust-lang/rust/pull/61953/
726 [62042]: https://github.com/rust-lang/rust/pull/62042/
727 [62528]: https://github.com/rust-lang/rust/pull/62528/
728 [62583]: https://github.com/rust-lang/rust/pull/62583/
729 [62735]: https://github.com/rust-lang/rust/pull/62735/
730 [62766]: https://github.com/rust-lang/rust/pull/62766/
731 [62784]: https://github.com/rust-lang/rust/pull/62784/
732 [62785]: https://github.com/rust-lang/rust/issues/62785/
733 [62814]: https://github.com/rust-lang/rust/pull/62814/
734 [62896]: https://github.com/rust-lang/rust/issues/62896/
735 [63000]: https://github.com/rust-lang/rust/pull/63000/
736 [63056]: https://github.com/rust-lang/rust/pull/63056/
737 [63107]: https://github.com/rust-lang/rust/pull/63107/
738 [63346]: https://github.com/rust-lang/rust/pull/63346/
739 [63421]: https://github.com/rust-lang/rust/pull/63421/
740 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
741 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
742 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
743 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
744 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
745 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
746 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
747 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
748 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
749 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
750 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
751 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
752 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
753 [forge-platform-support]: https://forge.rust-lang.org/platform-support.html
754 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
756 Version 1.37.0 (2019-08-15)
757 ==========================
761 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
762 [`Box`][62228], or an [array][62235] and unused.
763 - [You can now use the `cfg` and `cfg_attr` attributes on
764 generic parameters.][61547]
765 - [You can now use enum variants through type alias.][61682] e.g. You can
768 type MyOption = Option<u8>;
770 fn increment_or_zero(x: MyOption) -> u8 {
772 MyOption::Some(y) => y + 1,
777 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
779 - [You can now use `#[repr(align(X)]` on enums.][61229]
780 - [The `?` Kleene macro operator is now available in the
781 2015 edition.][60932]
785 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
786 and `-C profile-use` flags.][61268] For more information on how to use profile
787 guided optimization, please refer to the [rustc book][rustc-book-pgo].
788 - [The `rust-lldb` wrapper script should now work again.][61827]
792 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
796 - [`BufReader::buffer`]
797 - [`BufWriter::buffer`]
799 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
800 - [`DoubleEndedIterator::nth_back`]
802 - [`Wrapping::reverse_bits`]
803 - [`i128::reverse_bits`]
804 - [`i16::reverse_bits`]
805 - [`i32::reverse_bits`]
806 - [`i64::reverse_bits`]
807 - [`i8::reverse_bits`]
808 - [`isize::reverse_bits`]
809 - [`slice::copy_within`]
810 - [`u128::reverse_bits`]
811 - [`u16::reverse_bits`]
812 - [`u32::reverse_bits`]
813 - [`u64::reverse_bits`]
814 - [`u8::reverse_bits`]
815 - [`usize::reverse_bits`]
819 - [`Cargo.lock` files are now included by default when publishing executable crates
820 with executables.][cargo/7026]
821 - [You can now specify `default-run="foo"` in `[package]` to specify the
822 default executable to use for `cargo run`.][cargo/7056]
829 - [Using `...` for inclusive range patterns will now warn by default.][61342]
830 Please transition your code to using the `..=` syntax for inclusive
832 - [Using a trait object without the `dyn` will now warn by default.][61203]
833 Please transition your code to use `dyn Trait` for trait objects instead.
835 [62228]: https://github.com/rust-lang/rust/pull/62228/
836 [62235]: https://github.com/rust-lang/rust/pull/62235/
837 [61802]: https://github.com/rust-lang/rust/pull/61802/
838 [61827]: https://github.com/rust-lang/rust/pull/61827/
839 [61547]: https://github.com/rust-lang/rust/pull/61547/
840 [61682]: https://github.com/rust-lang/rust/pull/61682/
841 [61268]: https://github.com/rust-lang/rust/pull/61268/
842 [61342]: https://github.com/rust-lang/rust/pull/61342/
843 [61347]: https://github.com/rust-lang/rust/pull/61347/
844 [61100]: https://github.com/rust-lang/rust/pull/61100/
845 [61203]: https://github.com/rust-lang/rust/pull/61203/
846 [61229]: https://github.com/rust-lang/rust/pull/61229/
847 [60932]: https://github.com/rust-lang/rust/pull/60932/
848 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
849 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
850 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
851 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
852 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
853 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
854 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
855 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
856 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
857 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
858 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
859 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
860 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
861 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
862 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
863 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
864 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
865 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
866 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
867 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
868 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
869 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
870 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
871 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
874 Version 1.36.0 (2019-07-04)
875 ==========================
879 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
880 - [The order of traits in trait objects no longer affects the semantics of that
881 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
882 `dyn fmt::Debug + Send`, where this was previously not the case.
886 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
887 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
888 - [`mem::needs_drop` is now available as a const fn.][60364]
889 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
890 - [`String` now implements `BorrowMut<str>`.][60404]
891 - [`io::Cursor` now implements `Default`.][60234]
892 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
893 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
894 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
895 environment has access to heap memory allocation.
896 - [`String` now implements `From<&String>`.][59825]
897 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
898 return a tuple of each argument when there is multiple arguments.
899 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
904 - [`VecDeque::rotate_left`]
905 - [`VecDeque::rotate_right`]
906 - [`Iterator::copied`]
909 - [`Read::read_vectored`]
910 - [`Write::write_vectored`]
911 - [`str::as_mut_ptr`]
912 - [`mem::MaybeUninit`]
913 - [`pointer::align_offset`]
917 - [`task::RawWakerVTable`]
923 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
924 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
926 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
930 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
937 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
938 longer recommended, and will be deprecated in 1.39.0.
940 [60318]: https://github.com/rust-lang/rust/pull/60318/
941 [60364]: https://github.com/rust-lang/rust/pull/60364/
942 [60370]: https://github.com/rust-lang/rust/pull/60370/
943 [60404]: https://github.com/rust-lang/rust/pull/60404/
944 [60234]: https://github.com/rust-lang/rust/pull/60234/
945 [60244]: https://github.com/rust-lang/rust/pull/60244/
946 [58623]: https://github.com/rust-lang/rust/pull/58623/
947 [59648]: https://github.com/rust-lang/rust/pull/59648/
948 [59675]: https://github.com/rust-lang/rust/pull/59675/
949 [59825]: https://github.com/rust-lang/rust/pull/59825/
950 [59826]: https://github.com/rust-lang/rust/pull/59826/
951 [59445]: https://github.com/rust-lang/rust/pull/59445/
952 [59114]: https://github.com/rust-lang/rust/pull/59114/
953 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
954 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
955 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
956 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
957 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
958 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
959 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
960 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
961 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
962 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
963 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
964 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
965 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
966 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
967 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
968 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
969 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
970 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
971 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
972 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
975 Version 1.35.0 (2019-05-23)
976 ==========================
980 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
981 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
982 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
984 unsafe fn call_unsafe(func: unsafe fn()) {
989 unsafe { call_unsafe(|| {}); }
996 - [Added the `armv6-unknown-freebsd-gnueabihf` and
997 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
998 - [Added the `wasm32-unknown-wasi` target.][59464]
1003 - [`Thread` will now show its ID in `Debug` output.][59460]
1004 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1005 - [`alloc::System` now implements `Default`.][59451]
1006 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1008 - [`char::{ToLowercase, ToUppercase}` now
1009 implement `ExactSizeIterator`.][58778]
1010 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1011 - [Removed the `Read` trait bounds
1012 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1013 - [You can now call the `dbg!` macro without any parameters to print the file
1014 and line where it is called.][57847]
1015 - [In place ASCII case conversions are now up to 4× faster.][59283]
1016 e.g. `str::make_ascii_lowercase`
1017 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1024 - [`RefCell::replace_with`]
1025 - [`RefCell::map_split`]
1027 - [`Range::contains`]
1028 - [`RangeFrom::contains`]
1029 - [`RangeTo::contains`]
1030 - [`RangeInclusive::contains`]
1031 - [`RangeToInclusive::contains`]
1032 - [`Option::copied`]
1036 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1037 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1042 - [The Rust toolchain is now available natively for musl based distros.][58575]
1044 [59460]: https://github.com/rust-lang/rust/pull/59460/
1045 [59464]: https://github.com/rust-lang/rust/pull/59464/
1046 [59500]: https://github.com/rust-lang/rust/pull/59500/
1047 [59512]: https://github.com/rust-lang/rust/pull/59512/
1048 [59580]: https://github.com/rust-lang/rust/pull/59580/
1049 [59283]: https://github.com/rust-lang/rust/pull/59283/
1050 [59451]: https://github.com/rust-lang/rust/pull/59451/
1051 [59076]: https://github.com/rust-lang/rust/pull/59076/
1052 [58778]: https://github.com/rust-lang/rust/pull/58778/
1053 [58717]: https://github.com/rust-lang/rust/pull/58717/
1054 [58369]: https://github.com/rust-lang/rust/pull/58369/
1055 [58423]: https://github.com/rust-lang/rust/pull/58423/
1056 [58080]: https://github.com/rust-lang/rust/pull/58080/
1057 [57847]: https://github.com/rust-lang/rust/pull/57847/
1058 [58575]: https://github.com/rust-lang/rust/pull/58575
1059 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1060 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1061 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1062 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1063 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1064 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1065 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1066 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1067 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1068 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1069 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1070 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1072 Version 1.34.2 (2019-05-14)
1073 ===========================
1075 * [Destabilize the `Error::type_id` function due to a security
1076 vulnerability][60785] ([CVE-2019-12083])
1078 [60785]: https://github.com/rust-lang/rust/pull/60785
1079 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1081 Version 1.34.1 (2019-04-25)
1082 ===========================
1084 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1085 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1086 * [Fix Clippy panic when checking some macros][clippy/3805]
1088 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1089 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1090 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1092 Version 1.34.0 (2019-04-11)
1093 ==========================
1097 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1098 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1100 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1101 `#[attr{}]` procedural macros.][57367]
1102 - [You can now write `extern crate self as foo;`][57407] to import your
1103 crate's root into the extern prelude.
1108 - [You can now target `riscv64imac-unknown-none-elf` and
1109 `riscv64gc-unknown-none-elf`.][58406]
1110 - [You can now enable linker plugin LTO optimisations with
1111 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1112 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1114 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1119 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1120 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1121 the `Hash` trait to create an iterator.
1122 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1123 methods.][58421] Most notably you no longer require the `Ord` trait to create
1125 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1126 for all numeric types.][58044]
1127 - [Indexing a `str` is now generic over all types that
1128 implement `SliceIndex<str>`.][57604]
1129 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1130 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1131 produce a warning if their returning type is unused.
1132 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1133 `overflowing_pow` are now available for all numeric types.][57873] These are
1134 equivalent to methods such as `wrapping_add` for the `pow` operation.
1142 * [`Error::type_id`]
1143 * [`atomic::AtomicI16`]
1144 * [`atomic::AtomicI32`]
1145 * [`atomic::AtomicI64`]
1146 * [`atomic::AtomicI8`]
1147 * [`atomic::AtomicU16`]
1148 * [`atomic::AtomicU32`]
1149 * [`atomic::AtomicU64`]
1150 * [`atomic::AtomicU8`]
1151 * [`convert::Infallible`]
1152 * [`convert::TryFrom`]
1153 * [`convert::TryInto`]
1155 * [`iter::successors`]
1156 * [`num::NonZeroI128`]
1157 * [`num::NonZeroI16`]
1158 * [`num::NonZeroI32`]
1159 * [`num::NonZeroI64`]
1160 * [`num::NonZeroI8`]
1161 * [`num::NonZeroIsize`]
1162 * [`slice::sort_by_cached_key`]
1163 * [`str::escape_debug`]
1164 * [`str::escape_default`]
1165 * [`str::escape_unicode`]
1166 * [`str::split_ascii_whitespace`]
1169 * [`Instant::checked_add`]
1170 * [`Instant::checked_sub`]
1171 * [`SystemTime::checked_add`]
1172 * [`SystemTime::checked_sub`]
1176 - [You can now use alternative registries to crates.io.][cargo/6654]
1180 - [You can now use the `?` operator in your documentation tests without manually
1181 adding `fn main() -> Result<(), _> {}`.][56470]
1185 - [`Command::before_exec` is being replaced by the unsafe method
1186 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1187 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1188 can now use `const` functions in `static` variables.
1190 [58370]: https://github.com/rust-lang/rust/pull/58370/
1191 [58406]: https://github.com/rust-lang/rust/pull/58406/
1192 [58421]: https://github.com/rust-lang/rust/pull/58421/
1193 [58166]: https://github.com/rust-lang/rust/pull/58166/
1194 [58044]: https://github.com/rust-lang/rust/pull/58044/
1195 [58057]: https://github.com/rust-lang/rust/pull/58057/
1196 [58059]: https://github.com/rust-lang/rust/pull/58059/
1197 [57809]: https://github.com/rust-lang/rust/pull/57809/
1198 [57873]: https://github.com/rust-lang/rust/pull/57873/
1199 [57604]: https://github.com/rust-lang/rust/pull/57604/
1200 [57367]: https://github.com/rust-lang/rust/pull/57367/
1201 [57407]: https://github.com/rust-lang/rust/pull/57407/
1202 [57425]: https://github.com/rust-lang/rust/pull/57425/
1203 [57106]: https://github.com/rust-lang/rust/pull/57106/
1204 [56470]: https://github.com/rust-lang/rust/pull/56470/
1205 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1206 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1207 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1208 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1209 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1210 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1211 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1212 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1213 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1214 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1215 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1216 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1217 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1218 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1219 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1220 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1221 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1222 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1223 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1224 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1225 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1226 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1227 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1228 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1229 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1230 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1231 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1232 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1233 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1234 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1235 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1238 Version 1.33.0 (2019-02-28)
1239 ==========================
1243 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1244 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1245 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1246 E.g. You can have match statement on a `u8` that covers `0..=255` and
1247 you would no longer be required to have a `_ => unreachable!()` case.
1248 - [You can now have multiple patterns in `if let` and `while let`
1249 expressions.][57532] You can do this with the same syntax as a `match`
1259 let state = Creature::Crab("Ferris");
1261 if let Creature::Crab(name) | Creature::Person(name) = state {
1262 println!("This creature's name is: {}", name);
1266 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1267 this feature will by default produce a warning as this behaviour can be
1268 unintuitive. E.g. `if let _ = 5 {}`
1269 - [You can now use `let` bindings, assignments, expression statements,
1270 and irrefutable pattern destructuring in const functions.][57175]
1271 - [You can now call unsafe const functions.][57067] E.g.
1273 const unsafe fn foo() -> i32 { 5 }
1274 const fn bar() -> i32 {
1278 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1279 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1280 - [You can now specify a specific alignment with the `#[repr(packed)]`
1281 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1282 with an alignment of 2 bytes and a size of 6 bytes.
1283 - [You can now import an item from a module as an `_`.][56303] This allows you to
1284 import a trait's impls, and not have the name in the namespace. E.g.
1286 use std::io::Read as _;
1288 // Allowed as there is only one `Read` in the module.
1291 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1295 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1296 command line argument.][56351]
1297 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1298 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1299 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1300 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1301 information on Rust's platform support.
1302 - [Added support for the `thumbv7neon-linux-androideabi` and
1303 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1304 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1308 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1309 functions for all numeric types.][57566]
1310 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1311 are now `const` functions for all numeric types.][57105]
1312 - [The methods `is_positive` and `is_negative` are now `const` functions for
1313 all signed numeric types.][57105]
1314 - [The `get` method for all `NonZero` types is now `const`.][57167]
1315 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1316 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1317 numeric types.][57234]
1318 - [`Ipv4Addr::new` is now a `const` function][57234]
1322 - [`unix::FileExt::read_exact_at`]
1323 - [`unix::FileExt::write_all_at`]
1324 - [`Option::transpose`]
1325 - [`Result::transpose`]
1326 - [`convert::identity`]
1329 - [`marker::PhantomPinned`]
1330 - [`Vec::resize_with`]
1331 - [`VecDeque::resize_with`]
1332 - [`Duration::as_millis`]
1333 - [`Duration::as_micros`]
1334 - [`Duration::as_nanos`]
1339 - [You can now publish crates that require a feature flag to compile with
1340 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1341 - [Cargo should now rebuild a crate if a file was modified during the initial
1346 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1347 are now deprecated in the standard library, and their usage will now produce a warning.
1348 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1350 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1352 - [Libtest no longer creates a new thread for each test when
1353 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1355 [55982]: https://github.com/rust-lang/rust/pull/55982/
1356 [56243]: https://github.com/rust-lang/rust/pull/56243
1357 [56303]: https://github.com/rust-lang/rust/pull/56303/
1358 [56351]: https://github.com/rust-lang/rust/pull/56351/
1359 [56362]: https://github.com/rust-lang/rust/pull/56362
1360 [56642]: https://github.com/rust-lang/rust/pull/56642/
1361 [56769]: https://github.com/rust-lang/rust/pull/56769/
1362 [56805]: https://github.com/rust-lang/rust/pull/56805
1363 [56947]: https://github.com/rust-lang/rust/pull/56947/
1364 [57049]: https://github.com/rust-lang/rust/pull/57049/
1365 [57067]: https://github.com/rust-lang/rust/pull/57067/
1366 [57105]: https://github.com/rust-lang/rust/pull/57105
1367 [57130]: https://github.com/rust-lang/rust/pull/57130/
1368 [57167]: https://github.com/rust-lang/rust/pull/57167/
1369 [57175]: https://github.com/rust-lang/rust/pull/57175/
1370 [57234]: https://github.com/rust-lang/rust/pull/57234/
1371 [57332]: https://github.com/rust-lang/rust/pull/57332/
1372 [57465]: https://github.com/rust-lang/rust/pull/57465/
1373 [57532]: https://github.com/rust-lang/rust/pull/57532/
1374 [57535]: https://github.com/rust-lang/rust/pull/57535/
1375 [57566]: https://github.com/rust-lang/rust/pull/57566/
1376 [57615]: https://github.com/rust-lang/rust/pull/57615/
1377 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1378 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1379 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1380 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1381 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1382 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1383 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1384 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1385 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1386 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1387 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1388 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1389 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1390 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1391 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1392 [platform-support]: https://forge.rust-lang.org/platform-support.html
1394 Version 1.32.0 (2019-01-17)
1395 ==========================
1400 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1401 operator allows you to specify zero or one repetitions similar to the `*` and
1403 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1404 now always resolve to the item (`enum`, `struct`, etc.) available in the
1405 module if present, before resolving to a external crate or an item the prelude.][56759]
1408 enum Color { Red, Green, Blue }
1414 - [You can now match against `PhantomData<T>` types.][55837]
1415 - [You can now match against literals in macros with the `literal`
1416 specifier.][56072] This will match against a literal of any type.
1417 E.g. `1`, `'A'`, `"Hello World"`
1418 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1420 struct Point(i32, i32);
1423 pub fn new(x: i32, y: i32) -> Self {
1427 pub fn is_origin(&self) -> bool {
1435 - [Self can also now be used in type definitions.][56366] E.g.
1439 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1442 Cons(T, Box<Self>) // likewise here
1445 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1446 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1450 - [The default allocator has changed from jemalloc to the default allocator on
1451 your system.][55238] The compiler itself on Linux & macOS will still use
1452 jemalloc, but programs compiled with it will use the system allocator.
1453 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1457 - [`PathBuf` now implements `FromStr`.][55148]
1458 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1459 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1460 easily debug expressions in your rust program. E.g.
1463 let b = dbg!(a * 2) + 1;
1464 // ^-- prints: [src/main.rs:4] a * 2 = 4
1468 The following APIs are now `const` functions and can be used in a
1472 - [`UnsafeCell::get`]
1473 - [`char::is_ascii`]
1475 - [`ManuallyDrop::new`]
1476 - [`ManuallyDrop::into_inner`]
1477 - [`RangeInclusive::start`]
1478 - [`RangeInclusive::end`]
1479 - [`NonNull::as_ptr`]
1482 - [`Duration::as_secs`]
1483 - [`Duration::subsec_millis`]
1484 - [`Duration::subsec_micros`]
1485 - [`Duration::subsec_nanos`]
1487 - [`Ipv4Addr::is_unspecified`]
1489 - [`Ipv6Addr::octets`]
1493 - [`i8::to_be_bytes`]
1494 - [`i8::to_le_bytes`]
1495 - [`i8::to_ne_bytes`]
1496 - [`i8::from_be_bytes`]
1497 - [`i8::from_le_bytes`]
1498 - [`i8::from_ne_bytes`]
1499 - [`i16::to_be_bytes`]
1500 - [`i16::to_le_bytes`]
1501 - [`i16::to_ne_bytes`]
1502 - [`i16::from_be_bytes`]
1503 - [`i16::from_le_bytes`]
1504 - [`i16::from_ne_bytes`]
1505 - [`i32::to_be_bytes`]
1506 - [`i32::to_le_bytes`]
1507 - [`i32::to_ne_bytes`]
1508 - [`i32::from_be_bytes`]
1509 - [`i32::from_le_bytes`]
1510 - [`i32::from_ne_bytes`]
1511 - [`i64::to_be_bytes`]
1512 - [`i64::to_le_bytes`]
1513 - [`i64::to_ne_bytes`]
1514 - [`i64::from_be_bytes`]
1515 - [`i64::from_le_bytes`]
1516 - [`i64::from_ne_bytes`]
1517 - [`i128::to_be_bytes`]
1518 - [`i128::to_le_bytes`]
1519 - [`i128::to_ne_bytes`]
1520 - [`i128::from_be_bytes`]
1521 - [`i128::from_le_bytes`]
1522 - [`i128::from_ne_bytes`]
1523 - [`isize::to_be_bytes`]
1524 - [`isize::to_le_bytes`]
1525 - [`isize::to_ne_bytes`]
1526 - [`isize::from_be_bytes`]
1527 - [`isize::from_le_bytes`]
1528 - [`isize::from_ne_bytes`]
1529 - [`u8::to_be_bytes`]
1530 - [`u8::to_le_bytes`]
1531 - [`u8::to_ne_bytes`]
1532 - [`u8::from_be_bytes`]
1533 - [`u8::from_le_bytes`]
1534 - [`u8::from_ne_bytes`]
1535 - [`u16::to_be_bytes`]
1536 - [`u16::to_le_bytes`]
1537 - [`u16::to_ne_bytes`]
1538 - [`u16::from_be_bytes`]
1539 - [`u16::from_le_bytes`]
1540 - [`u16::from_ne_bytes`]
1541 - [`u32::to_be_bytes`]
1542 - [`u32::to_le_bytes`]
1543 - [`u32::to_ne_bytes`]
1544 - [`u32::from_be_bytes`]
1545 - [`u32::from_le_bytes`]
1546 - [`u32::from_ne_bytes`]
1547 - [`u64::to_be_bytes`]
1548 - [`u64::to_le_bytes`]
1549 - [`u64::to_ne_bytes`]
1550 - [`u64::from_be_bytes`]
1551 - [`u64::from_le_bytes`]
1552 - [`u64::from_ne_bytes`]
1553 - [`u128::to_be_bytes`]
1554 - [`u128::to_le_bytes`]
1555 - [`u128::to_ne_bytes`]
1556 - [`u128::from_be_bytes`]
1557 - [`u128::from_le_bytes`]
1558 - [`u128::from_ne_bytes`]
1559 - [`usize::to_be_bytes`]
1560 - [`usize::to_le_bytes`]
1561 - [`usize::to_ne_bytes`]
1562 - [`usize::from_be_bytes`]
1563 - [`usize::from_le_bytes`]
1564 - [`usize::from_ne_bytes`]
1568 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1569 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1573 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1577 - [The argument types for AVX's
1578 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1579 been changed from `*const` to `*mut` as the previous implementation
1583 [55148]: https://github.com/rust-lang/rust/pull/55148/
1584 [55238]: https://github.com/rust-lang/rust/pull/55238/
1585 [55280]: https://github.com/rust-lang/rust/pull/55280/
1586 [55610]: https://github.com/rust-lang/rust/pull/55610/
1587 [55663]: https://github.com/rust-lang/rust/pull/55663/
1588 [55702]: https://github.com/rust-lang/rust/pull/55702/
1589 [55837]: https://github.com/rust-lang/rust/pull/55837/
1590 [55843]: https://github.com/rust-lang/rust/pull/55843/
1591 [56072]: https://github.com/rust-lang/rust/pull/56072/
1592 [56245]: https://github.com/rust-lang/rust/pull/56245/
1593 [56365]: https://github.com/rust-lang/rust/pull/56365/
1594 [56366]: https://github.com/rust-lang/rust/pull/56366/
1595 [56395]: https://github.com/rust-lang/rust/pull/56395/
1596 [56759]: https://github.com/rust-lang/rust/pull/56759/
1597 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1598 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1599 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1600 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1601 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1602 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1603 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1604 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1605 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1606 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1607 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1608 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1609 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1610 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1611 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1612 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1613 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1614 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1615 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1616 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1617 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1618 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1619 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1620 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1621 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1622 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1623 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1624 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1625 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1626 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1627 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1628 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1629 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1630 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1631 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1632 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1633 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1634 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1635 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1636 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1637 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1638 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1639 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1640 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1641 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1642 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1643 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1644 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1645 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1646 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1647 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1648 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1649 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1650 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1651 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1652 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1653 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1654 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1655 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1656 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1657 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1658 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1659 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1660 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1661 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1662 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1663 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1664 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1665 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1666 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1667 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1668 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1669 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1670 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1671 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1672 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1673 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1674 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
1675 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
1676 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
1677 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
1678 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
1679 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
1680 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
1681 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
1682 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
1683 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
1684 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
1685 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
1686 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
1687 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
1688 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
1689 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
1692 Version 1.31.1 (2018-12-20)
1693 ===========================
1695 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
1696 - [Fix broken go-to-definition in RLS][rls/1171]
1697 - [Fix infinite loop on hover in RLS][rls/1170]
1699 [56562]: https://github.com/rust-lang/rust/pull/56562
1700 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
1701 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
1703 Version 1.31.0 (2018-12-06)
1704 ==========================
1708 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
1709 - [New lifetime elision rules now allow for eliding lifetimes in functions and
1710 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
1711 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
1713 - [You can now define and use `const` functions.][54835] These are currently
1714 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
1715 [language reference][const-reference] for what exactly is available.
1716 - [You can now use tool lints, which allow you to scope lints from external
1717 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
1718 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
1719 a crate, not just in exported functions.][54451]
1720 - [You can now use parentheses in pattern matches.][54497]
1724 - [Updated musl to 1.1.20][54430]
1728 - [You can now convert `num::NonZero*` types to their raw equivalents using the
1729 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
1730 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
1731 into `Option<&mut T>` using the `From` trait.][53218]
1732 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
1737 - [`slice::align_to`]
1738 - [`slice::align_to_mut`]
1739 - [`slice::chunks_exact`]
1740 - [`slice::chunks_exact_mut`]
1741 - [`slice::rchunks`]
1742 - [`slice::rchunks_mut`]
1743 - [`slice::rchunks_exact`]
1744 - [`slice::rchunks_exact_mut`]
1745 - [`Option::replace`]
1749 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
1750 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
1751 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
1753 [52813]: https://github.com/rust-lang/rust/pull/52813/
1754 [53218]: https://github.com/rust-lang/rust/pull/53218/
1755 [53555]: https://github.com/rust-lang/rust/issues/53555/
1756 [54057]: https://github.com/rust-lang/rust/pull/54057/
1757 [54240]: https://github.com/rust-lang/rust/pull/54240/
1758 [54430]: https://github.com/rust-lang/rust/pull/54430/
1759 [54451]: https://github.com/rust-lang/rust/pull/54451/
1760 [54497]: https://github.com/rust-lang/rust/pull/54497/
1761 [54778]: https://github.com/rust-lang/rust/pull/54778/
1762 [54835]: https://github.com/rust-lang/rust/pull/54835/
1763 [54870]: https://github.com/rust-lang/rust/pull/54870/
1764 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1765 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1766 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1767 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1768 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1769 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1770 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1771 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1772 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1773 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1774 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1775 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1776 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1777 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1779 Version 1.30.1 (2018-11-08)
1780 ===========================
1782 - [Fixed overflow ICE in rustdoc][54199]
1783 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1785 [54199]: https://github.com/rust-lang/rust/pull/54199
1786 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1788 Version 1.30.0 (2018-10-25)
1789 ==========================
1793 - [Procedural macros are now available.][52081] These kinds of macros allow for
1794 more powerful code generation. There is a [new chapter available][proc-macros]
1795 in the Rust Programming Language book that goes further in depth.
1796 - [You can now use keywords as identifiers using the raw identifiers
1797 syntax (`r#`),][53236] e.g. `let r#for = true;`
1798 - [Using anonymous parameters in traits is now deprecated with a warning and
1799 will be a hard error in the 2018 edition.][53272]
1800 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1801 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1802 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1803 Previously, using a external crate in a module without a use statement
1804 required `let json = ::serde_json::from_str(foo);` but can now be written
1805 as `let json = serde_json::from_str(foo);`.
1806 - [You can now apply the `#[used]` attribute to static items to prevent the
1807 compiler from optimising them away, even if they appear to be unused,][51363]
1808 e.g. `#[used] static FOO: u32 = 1;`
1809 - [You can now import and reexport macros from other crates with the `use`
1810 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1811 the root module of the crate. If your macro relies on calling other local
1812 macros, it is recommended to export with the
1813 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1815 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1816 using the `vis` specifier.][53370]
1817 - [Non-macro attributes now allow all forms of literals, not just
1818 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1819 write `#[attr(true)]`.
1820 - [You can now specify a function to handle a panic in the Rust runtime with the
1821 `#[panic_handler]` attribute.][51366]
1825 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1826 - [Added the `aarch64-unknown-netbsd` target][53165]
1830 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1834 - [`Ipv4Addr::BROADCAST`]
1835 - [`Ipv4Addr::LOCALHOST`]
1836 - [`Ipv4Addr::UNSPECIFIED`]
1837 - [`Ipv6Addr::LOCALHOST`]
1838 - [`Ipv6Addr::UNSPECIFIED`]
1839 - [`Iterator::find_map`]
1841 The following methods are replacement methods for `trim_left`, `trim_right`,
1842 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
1844 - [`str::trim_end_matches`]
1846 - [`str::trim_start_matches`]
1847 - [`str::trim_start`]
1851 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
1852 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
1853 equivalent to calling `rustdoc --error-format=json`.
1854 - [Cargo will now provide a progress bar for builds.][cargo/5995]
1858 - [`rustdoc` allows you to specify what edition to treat your code as with the
1859 `--edition` option.][54057]
1860 - [`rustdoc` now has the `--color` (specify whether to output color) and
1861 `--error-format` (specify error format, e.g. `json`) options.][53003]
1862 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
1863 debug symbols.][53774]
1864 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
1865 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
1867 [50911]: https://github.com/rust-lang/rust/pull/50911/
1868 [51363]: https://github.com/rust-lang/rust/pull/51363/
1869 [51366]: https://github.com/rust-lang/rust/pull/51366/
1870 [52081]: https://github.com/rust-lang/rust/pull/52081/
1871 [53003]: https://github.com/rust-lang/rust/pull/53003/
1872 [53033]: https://github.com/rust-lang/rust/pull/53033/
1873 [53044]: https://github.com/rust-lang/rust/pull/53044/
1874 [53165]: https://github.com/rust-lang/rust/pull/53165/
1875 [53213]: https://github.com/rust-lang/rust/pull/53213/
1876 [53236]: https://github.com/rust-lang/rust/pull/53236/
1877 [53272]: https://github.com/rust-lang/rust/pull/53272/
1878 [53370]: https://github.com/rust-lang/rust/pull/53370/
1879 [53459]: https://github.com/rust-lang/rust/pull/53459/
1880 [53774]: https://github.com/rust-lang/rust/pull/53774/
1881 [53822]: https://github.com/rust-lang/rust/pull/53822/
1882 [54057]: https://github.com/rust-lang/rust/pull/54057/
1883 [54146]: https://github.com/rust-lang/rust/pull/54146/
1884 [54404]: https://github.com/rust-lang/rust/pull/54404/
1885 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
1886 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
1887 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
1888 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
1890 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
1891 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
1892 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
1893 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
1894 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
1895 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
1896 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
1897 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
1898 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
1899 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
1902 Version 1.29.2 (2018-10-11)
1903 ===========================
1905 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
1906 - The `rls-preview` component on the windows-gnu targets has been restored.
1908 [54639]: https://github.com/rust-lang/rust/pull/54639
1911 Version 1.29.1 (2018-09-25)
1912 ===========================
1917 - The standard library's `str::repeat` function contained an out of bounds write
1918 caused by an integer overflow. This has been fixed by deterministically
1919 panicking when an overflow happens.
1921 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
1925 Version 1.29.0 (2018-09-13)
1926 ==========================
1930 - [Bumped minimum LLVM version to 5.0.][51899]
1931 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
1932 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
1936 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
1937 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
1938 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
1939 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
1941 - [`Cell<T>` now allows `T` to be unsized.][50494]
1942 - [`SocketAddr` is now stable on Redox.][52656]
1947 - [`Iterator::flatten`]
1952 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
1953 `--locked` to disable this behavior.
1954 - [`cargo-install` will now allow you to cross compile an install
1955 using `--target`.][cargo/5614]
1956 - [Added the `cargo-fix` subcommand to automatically move project code from
1957 2015 edition to 2018.][cargo/5723]
1958 - [`cargo doc` can now optionally document private types using the
1959 `--document-private-items` flag.][cargo/5543]
1963 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
1964 the specified level to that level.][52354] For example `--cap-lints warn`
1965 will demote `deny` and `forbid` lints to `warn`.
1966 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
1967 fails and `101` if there is a panic.][52197]
1968 - [A preview of clippy has been made available through rustup.][51122]
1969 You can install the preview with `rustup component add clippy-preview`.
1973 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
1974 Use `str::get_unchecked(begin..end)` instead.
1975 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
1976 Consider using the `home_dir` function from
1977 https://crates.io/crates/dirs instead.
1978 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
1979 - [`cfg` attributes and `--cfg` command line flags are now more
1980 strictly validated.][53893]
1982 [53893]: https://github.com/rust-lang/rust/pull/53893/
1983 [52861]: https://github.com/rust-lang/rust/pull/52861/
1984 [52656]: https://github.com/rust-lang/rust/pull/52656/
1985 [52239]: https://github.com/rust-lang/rust/pull/52239/
1986 [52330]: https://github.com/rust-lang/rust/pull/52330/
1987 [52354]: https://github.com/rust-lang/rust/pull/52354/
1988 [52402]: https://github.com/rust-lang/rust/pull/52402/
1989 [52103]: https://github.com/rust-lang/rust/pull/52103/
1990 [52197]: https://github.com/rust-lang/rust/pull/52197/
1991 [51807]: https://github.com/rust-lang/rust/pull/51807/
1992 [51899]: https://github.com/rust-lang/rust/pull/51899/
1993 [51912]: https://github.com/rust-lang/rust/pull/51912/
1994 [51511]: https://github.com/rust-lang/rust/pull/51511/
1995 [51619]: https://github.com/rust-lang/rust/pull/51619/
1996 [51656]: https://github.com/rust-lang/rust/pull/51656/
1997 [51178]: https://github.com/rust-lang/rust/pull/51178/
1998 [51122]: https://github.com/rust-lang/rust/pull/51122
1999 [50494]: https://github.com/rust-lang/rust/pull/50494/
2000 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2001 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2002 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2003 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2004 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2005 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2006 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2009 Version 1.28.0 (2018-08-02)
2010 ===========================
2014 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2015 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2016 the inner type across Foreign Function Interface (FFI) boundaries.
2017 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2018 and can now be used as identifiers.][51196]
2019 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2020 stable.][51241] This will allow users to specify a global allocator for
2022 - [Unit test functions marked with the `#[test]` attribute can now return
2023 `Result<(), E: Debug>` in addition to `()`.][51298]
2024 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2025 allows macros to easily target lifetimes.
2029 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2030 prioritise making smaller binary sizes. `z` is the same as `s` with the
2031 exception that it does not vectorise loops, which typically results in an even
2033 - [The short error format is now stable.][49546] Specified with
2034 `--error-format=short` this option will provide a more compressed output of
2035 rust error messages.
2036 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2037 - [Reduced the number of allocations in the macro parser.][50855] This can
2038 improve compile times of macro heavy crates on average by 5%.
2042 - [Implemented `Default` for `&mut str`.][51306]
2043 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2044 - [Implemented `Extend` for `()`.][50234]
2045 - [The `Debug` implementation of `time::Duration` should now be more easily
2046 human readable.][50364] Previously a `Duration` of one second would printed as
2047 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2048 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2049 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2050 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2051 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2052 for `PathBuf`.][50170]
2053 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2054 and `Wrapping<i128>`.][50465]
2055 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2056 possible.][51050] This can provide up to a 40% speed increase.
2057 - [Improved error messages when using `format!`.][50610]
2061 - [`Iterator::step_by`]
2062 - [`Path::ancestors`]
2063 - [`SystemTime::UNIX_EPOCH`]
2064 - [`alloc::GlobalAlloc`]
2066 - [`alloc::LayoutErr`]
2069 - [`alloc::alloc_zeroed`]
2070 - [`alloc::dealloc`]
2071 - [`alloc::realloc`]
2072 - [`alloc::handle_alloc_error`]
2073 - [`btree_map::Entry::or_default`]
2074 - [`fmt::Alignment`]
2075 - [`hash_map::Entry::or_default`]
2076 - [`iter::repeat_with`]
2077 - [`num::NonZeroUsize`]
2078 - [`num::NonZeroU128`]
2079 - [`num::NonZeroU16`]
2080 - [`num::NonZeroU32`]
2081 - [`num::NonZeroU64`]
2082 - [`num::NonZeroU8`]
2083 - [`ops::RangeBounds`]
2084 - [`slice::SliceIndex`]
2085 - [`slice::from_mut`]
2086 - [`slice::from_ref`]
2087 - [`{Any + Send + Sync}::downcast_mut`]
2088 - [`{Any + Send + Sync}::downcast_ref`]
2089 - [`{Any + Send + Sync}::is`]
2093 - [Cargo will now no longer allow you to publish crates with build scripts that
2094 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2095 considered to be immutable.
2099 - [The `suggestion_applicability` field in `rustc`'s json output is now
2100 stable.][50486] This will allow dev tools to check whether a code suggestion
2101 would apply to them.
2105 - [Rust will consider trait objects with duplicated constraints to be the same
2106 type as without the duplicated constraint.][51276] For example the below code will
2107 now fail to compile.
2112 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2115 impl Trait + Send + Send {
2116 fn test(&self) { println!("two"); }
2120 [49546]: https://github.com/rust-lang/rust/pull/49546/
2121 [50143]: https://github.com/rust-lang/rust/pull/50143/
2122 [50170]: https://github.com/rust-lang/rust/pull/50170/
2123 [50234]: https://github.com/rust-lang/rust/pull/50234/
2124 [50265]: https://github.com/rust-lang/rust/pull/50265/
2125 [50364]: https://github.com/rust-lang/rust/pull/50364/
2126 [50385]: https://github.com/rust-lang/rust/pull/50385/
2127 [50465]: https://github.com/rust-lang/rust/pull/50465/
2128 [50486]: https://github.com/rust-lang/rust/pull/50486/
2129 [50554]: https://github.com/rust-lang/rust/pull/50554/
2130 [50610]: https://github.com/rust-lang/rust/pull/50610/
2131 [50855]: https://github.com/rust-lang/rust/pull/50855/
2132 [51050]: https://github.com/rust-lang/rust/pull/51050/
2133 [51196]: https://github.com/rust-lang/rust/pull/51196/
2134 [51200]: https://github.com/rust-lang/rust/pull/51200/
2135 [51241]: https://github.com/rust-lang/rust/pull/51241/
2136 [51276]: https://github.com/rust-lang/rust/pull/51276/
2137 [51298]: https://github.com/rust-lang/rust/pull/51298/
2138 [51306]: https://github.com/rust-lang/rust/pull/51306/
2139 [51562]: https://github.com/rust-lang/rust/pull/51562/
2140 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2141 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2142 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2143 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2144 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2145 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2146 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2147 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2148 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2149 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2150 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2151 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2152 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2153 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2154 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2155 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2156 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2157 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2158 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2159 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2160 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2161 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2162 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2163 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2164 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2165 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2166 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2167 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2168 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2169 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2171 Version 1.27.2 (2018-07-20)
2172 ===========================
2177 - The borrow checker was fixed to avoid potential unsoundness when using
2178 match ergonomics: [#52213][52213].
2180 [52213]: https://github.com/rust-lang/rust/issues/52213
2182 Version 1.27.1 (2018-07-10)
2183 ===========================
2188 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2189 when running, which enabled executing code as some other user on a
2190 given machine. This release fixes that vulnerability; you can read
2191 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2193 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2198 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2199 match ergonomics: [#51415][51415], [#49534][49534].
2201 [51415]: https://github.com/rust-lang/rust/issues/51415
2202 [49534]: https://github.com/rust-lang/rust/issues/49534
2203 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2204 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2206 Version 1.27.0 (2018-06-21)
2207 ==========================
2211 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2212 be used as an identifier.
2213 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2214 bare `Trait` syntax, and should make it clearer when being used in tandem with
2215 `impl Trait` because it is equivalent to the following syntax:
2216 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2217 `Box<Trait> == Box<dyn Trait>`.
2218 - [Attributes on generic parameters such as types and lifetimes are
2219 now stable.][48851] e.g.
2220 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2221 - [The `#[must_use]` attribute can now also be used on functions as well as
2222 types.][48925] It provides a lint that by default warns users when the
2223 value returned by a function has not been used.
2227 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2231 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2232 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2233 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2234 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2235 the `cfg` attribute.
2236 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2237 std are now available in core.][49896]
2238 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2240 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2241 that the operation isn't done in place.
2242 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2243 the `#[must_use]` attribute][49533] to warn about unused potentially
2244 expensive allocations.
2248 - [`DoubleEndedIterator::rfind`]
2249 - [`DoubleEndedIterator::rfold`]
2250 - [`DoubleEndedIterator::try_rfold`]
2251 - [`Duration::from_micros`]
2252 - [`Duration::from_nanos`]
2253 - [`Duration::subsec_micros`]
2254 - [`Duration::subsec_millis`]
2255 - [`HashMap::remove_entry`]
2256 - [`Iterator::try_fold`]
2257 - [`Iterator::try_for_each`]
2259 - [`Option::filter`]
2260 - [`String::replace_range`]
2261 - [`Take::set_limit`]
2262 - [`hint::unreachable_unchecked`]
2263 - [`os::unix::process::parent_id`]
2264 - [`ptr::swap_nonoverlapping`]
2265 - [`slice::rsplit_mut`]
2267 - [`slice::swap_with_slice`]
2271 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2272 `readme`, and `repository` fields.][cargo/5386]
2273 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2274 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2275 a different directory than `target` for placing compilation artifacts.
2276 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2277 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2278 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2279 where cargo would infer a binary, Cargo will produce a warning. You can
2280 disable this feature ahead of time by setting any of the following to false:
2281 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2282 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2283 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2287 - [Added “The Rustc book” into the official documentation.][49707]
2288 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2289 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2293 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2294 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2295 compile, `"".is_empty()` will still compile.
2296 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2297 will only print the inner type.][48553] E.g.
2298 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2299 not `AtomicBool(true)`.
2300 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2301 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2302 alignment should cover all use cases.
2303 - The `.description()` method on the `std::error::Error` trait
2304 [has been soft-deprecated][50163]. It is no longer required to implement it.
2306 [48553]: https://github.com/rust-lang/rust/pull/48553/
2307 [48851]: https://github.com/rust-lang/rust/pull/48851/
2308 [48925]: https://github.com/rust-lang/rust/pull/48925/
2309 [49533]: https://github.com/rust-lang/rust/pull/49533/
2310 [49623]: https://github.com/rust-lang/rust/pull/49623/
2311 [49630]: https://github.com/rust-lang/rust/pull/49630/
2312 [49664]: https://github.com/rust-lang/rust/pull/49664/
2313 [49699]: https://github.com/rust-lang/rust/pull/49699/
2314 [49707]: https://github.com/rust-lang/rust/pull/49707/
2315 [49719]: https://github.com/rust-lang/rust/pull/49719/
2316 [49896]: https://github.com/rust-lang/rust/pull/49896/
2317 [49968]: https://github.com/rust-lang/rust/pull/49968/
2318 [50163]: https://github.com/rust-lang/rust/pull/50163
2319 [50177]: https://github.com/rust-lang/rust/pull/50177/
2320 [50378]: https://github.com/rust-lang/rust/pull/50378/
2321 [50398]: https://github.com/rust-lang/rust/pull/50398/
2322 [50423]: https://github.com/rust-lang/rust/pull/50423/
2323 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2324 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2325 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2326 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2327 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2328 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2329 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2330 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2331 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2332 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2333 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2334 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2335 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2336 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2337 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2338 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2339 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2340 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2341 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2342 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2343 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2344 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2345 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2346 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2347 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2348 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2349 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2350 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2351 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2352 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2355 Version 1.26.2 (2018-06-05)
2356 ==========================
2361 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2363 [51117]: https://github.com/rust-lang/rust/issues/51117
2366 Version 1.26.1 (2018-05-29)
2367 ==========================
2372 - [RLS now works on Windows.][50646]
2373 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2379 - [`fn main() -> impl Trait` no longer works for non-Termination
2381 This reverts an accidental stabilization.
2382 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2383 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2385 [50646]: https://github.com/rust-lang/rust/issues/50646
2386 [50656]: https://github.com/rust-lang/rust/pull/50656
2387 [50812]: https://github.com/rust-lang/rust/pull/50812
2388 [50950]: https://github.com/rust-lang/rust/issues/50950
2389 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2391 Version 1.26.0 (2018-05-10)
2392 ==========================
2396 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2397 implement either or both traits.][49299]
2398 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2399 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2400 lifetime can be elided.][49458]
2401 - [`impl Trait` is now stable allowing you to have abstract types in returns
2402 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2403 `fn open(path: impl AsRef<Path>)`.
2404 - [Pattern matching will now automatically apply dereferences.][49394]
2405 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2406 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2407 - [A lot of operations are now available in a const context.][46882] E.g. You
2408 can now index into constant arrays, reference and dereference into constants,
2409 and use tuple struct constructors.
2410 - [Fixed entry slice patterns are now stable.][48516] E.g.
2412 let points = [1, 2, 3, 4];
2414 [1, 2, 3, 4] => println!("All points were sequential."),
2415 _ => println!("Not all points were sequential."),
2422 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2423 - [Fixed exponential projection complexity on nested types.][48296]
2424 This can provide up to a ~12% reduction in compile times for certain crates.
2425 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2426 to remap path prefixes outputted by the compiler.
2427 - [Added `powerpc-unknown-netbsd` target.][48281]
2431 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2432 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2433 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2434 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2435 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2436 - [`ascii::escape_default` is now available in libcore.][48735]
2437 - [Trailing commas are now supported in std and core macros.][48056]
2438 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2439 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2444 - [`*const T::copy_to_nonoverlapping`]
2445 - [`*const T::copy_to`]
2446 - [`*const T::read_unaligned`]
2447 - [`*const T::read_volatile`]
2448 - [`*const T::read`]
2450 - [`*const T::wrapping_add`]
2451 - [`*const T::wrapping_sub`]
2453 - [`*mut T::copy_to_nonoverlapping`]
2454 - [`*mut T::copy_to`]
2455 - [`*mut T::read_unaligned`]
2456 - [`*mut T::read_volatile`]
2458 - [`*mut T::replace`]
2461 - [`*mut T::wrapping_add`]
2462 - [`*mut T::wrapping_sub`]
2463 - [`*mut T::write_bytes`]
2464 - [`*mut T::write_unaligned`]
2465 - [`*mut T::write_volatile`]
2468 - [`FromUtf8Error::as_bytes`]
2469 - [`LocalKey::try_with`]
2470 - [`Option::cloned`]
2471 - [`btree_map::Entry::and_modify`]
2472 - [`fs::read_to_string`]
2475 - [`hash_map::Entry::and_modify`]
2476 - [`iter::FusedIterator`]
2477 - [`ops::RangeInclusive`]
2478 - [`ops::RangeToInclusive`]
2480 - [`slice::rotate_left`]
2481 - [`slice::rotate_right`]
2482 - [`String::retain`]
2487 - [Cargo will now output path to custom commands when `-v` is
2488 passed with `--list`][cargo/5041]
2489 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2493 - [The second edition of "The Rust Programming Language" book is now recommended
2494 over the first.][48404]
2499 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2500 syntax is now invalid.
2502 use std::ops::Fn as dyn;
2503 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2505 - [The result of dereferences are no longer promoted to `'static`.][47408]
2509 const PAIR: &(i32, i32) = &(0, 1);
2510 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2513 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2514 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2516 - [Removed hoedown from rustdoc.][48274]
2517 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2519 [46882]: https://github.com/rust-lang/rust/pull/46882
2520 [47379]: https://github.com/rust-lang/rust/pull/47379
2521 [47408]: https://github.com/rust-lang/rust/pull/47408
2522 [47813]: https://github.com/rust-lang/rust/pull/47813
2523 [48056]: https://github.com/rust-lang/rust/pull/48056
2524 [48125]: https://github.com/rust-lang/rust/pull/48125
2525 [48166]: https://github.com/rust-lang/rust/pull/48166
2526 [48235]: https://github.com/rust-lang/rust/pull/48235
2527 [48274]: https://github.com/rust-lang/rust/pull/48274
2528 [48281]: https://github.com/rust-lang/rust/pull/48281
2529 [48296]: https://github.com/rust-lang/rust/pull/48296
2530 [48326]: https://github.com/rust-lang/rust/pull/48326
2531 [48359]: https://github.com/rust-lang/rust/pull/48359
2532 [48404]: https://github.com/rust-lang/rust/pull/48404
2533 [48481]: https://github.com/rust-lang/rust/pull/48481
2534 [48516]: https://github.com/rust-lang/rust/pull/48516
2535 [48628]: https://github.com/rust-lang/rust/pull/48628
2536 [48629]: https://github.com/rust-lang/rust/pull/48629
2537 [48657]: https://github.com/rust-lang/rust/pull/48657
2538 [48735]: https://github.com/rust-lang/rust/pull/48735
2539 [48978]: https://github.com/rust-lang/rust/pull/48978
2540 [49101]: https://github.com/rust-lang/rust/pull/49101
2541 [49109]: https://github.com/rust-lang/rust/pull/49109
2542 [49121]: https://github.com/rust-lang/rust/pull/49121
2543 [49162]: https://github.com/rust-lang/rust/pull/49162
2544 [49184]: https://github.com/rust-lang/rust/pull/49184
2545 [49234]: https://github.com/rust-lang/rust/pull/49234
2546 [49255]: https://github.com/rust-lang/rust/pull/49255
2547 [49299]: https://github.com/rust-lang/rust/pull/49299
2548 [49305]: https://github.com/rust-lang/rust/pull/49305
2549 [49394]: https://github.com/rust-lang/rust/pull/49394
2550 [49458]: https://github.com/rust-lang/rust/pull/49458
2551 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2552 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2553 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2554 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2555 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2556 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2557 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2558 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2559 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2560 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2561 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2562 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2563 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2564 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2565 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2566 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2567 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2568 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2569 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2570 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2571 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2572 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2573 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2574 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2575 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2576 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2577 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2578 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2579 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2580 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2581 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2582 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2583 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2584 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2585 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2586 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2587 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2588 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2589 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2590 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2591 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2592 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2595 Version 1.25.0 (2018-03-29)
2596 ==========================
2600 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2601 - [You can now use nested groups of imports.][47948]
2602 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2603 - [You can now have `|` at the start of a match arm.][47947] e.g.
2605 enum Foo { A, B, C }
2611 | Foo::B => println!("AB"),
2612 | Foo::C => println!("C"),
2619 - [Upgraded to LLVM 6.][47828]
2620 - [Added `-C lto=val` option.][47521]
2621 - [Added `i586-unknown-linux-musl` target][47282]
2625 - [Impl Send for `process::Command` on Unix.][47760]
2626 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2627 - [`UnsafeCell::into_inner` is now safe.][47204]
2628 - [Implement libstd for CloudABI.][47268]
2629 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2630 - [Implement `AsRef<Path>` for Component][46985]
2631 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2632 - [Moved `Duration` to libcore.][46666]
2636 - [`Location::column`]
2639 The following functions can now be used in a constant expression.
2640 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2641 - [`Duration::new`][47300]
2642 - [`Duration::from_secs`][47300]
2643 - [`Duration::from_millis`][47300]
2647 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2648 - [`cargo new` now defaults to creating a binary crate, instead of a
2649 library crate.][cargo/5029]
2653 - [Rust by example is now shipped with new releases][46196]
2657 - [Deprecated `net::lookup_host`.][47510]
2658 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2659 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2660 around indexing operations (see [#47349][47349]). This has been fixed (which also
2661 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2662 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2664 [33903]: https://github.com/rust-lang/rust/pull/33903
2665 [47947]: https://github.com/rust-lang/rust/pull/47947
2666 [47948]: https://github.com/rust-lang/rust/pull/47948
2667 [47760]: https://github.com/rust-lang/rust/pull/47760
2668 [47790]: https://github.com/rust-lang/rust/pull/47790
2669 [47828]: https://github.com/rust-lang/rust/pull/47828
2670 [47398]: https://github.com/rust-lang/rust/pull/47398
2671 [47510]: https://github.com/rust-lang/rust/pull/47510
2672 [47521]: https://github.com/rust-lang/rust/pull/47521
2673 [47204]: https://github.com/rust-lang/rust/pull/47204
2674 [47251]: https://github.com/rust-lang/rust/pull/47251
2675 [47268]: https://github.com/rust-lang/rust/pull/47268
2676 [47282]: https://github.com/rust-lang/rust/pull/47282
2677 [47300]: https://github.com/rust-lang/rust/pull/47300
2678 [47349]: https://github.com/rust-lang/rust/pull/47349
2679 [46931]: https://github.com/rust-lang/rust/pull/46931
2680 [46985]: https://github.com/rust-lang/rust/pull/46985
2681 [47006]: https://github.com/rust-lang/rust/pull/47006
2682 [46830]: https://github.com/rust-lang/rust/pull/46830
2683 [46095]: https://github.com/rust-lang/rust/pull/46095
2684 [46666]: https://github.com/rust-lang/rust/pull/46666
2685 [46196]: https://github.com/rust-lang/rust/pull/46196
2686 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
2687 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
2688 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
2689 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
2690 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
2693 Version 1.24.1 (2018-03-01)
2694 ==========================
2696 - [Do not abort when unwinding through FFI][48251]
2697 - [Emit UTF-16 files for linker arguments on Windows][48318]
2698 - [Make the error index generator work again][48308]
2699 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
2701 [48251]: https://github.com/rust-lang/rust/issues/48251
2702 [48308]: https://github.com/rust-lang/rust/issues/48308
2703 [48318]: https://github.com/rust-lang/rust/issues/48318
2704 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
2707 Version 1.24.0 (2018-02-15)
2708 ==========================
2712 - [External `sysv64` ffi is now available.][46528]
2713 eg. `extern "sysv64" fn foo () {}`
2717 - [rustc now uses 16 codegen units by default for release builds.][46910]
2718 For the fastest builds, utilize `codegen-units=1`.
2719 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
2720 - [Add `aarch64-unknown-openbsd` support][46760]
2724 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
2725 improvement in performance in the majority of cases.
2726 - [`OsStr`'s `Debug` implementation is now lossless and consistent
2727 with Windows.][46798]
2728 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
2729 - [impl `From<bool>` for `AtomicBool`][46293]
2730 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
2731 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
2732 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
2733 - [float::from_bits now just uses transmute.][46012] This provides
2734 some optimisations from LLVM.
2735 - [Copied `AsciiExt` methods onto `char`][46077]
2736 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
2737 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
2738 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
2739 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
2743 - [`RefCell::replace`]
2745 - [`atomic::spin_loop_hint`]
2747 The following functions can now be used in a constant expression.
2748 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
2750 - [`AtomicBool::new`][46287]
2751 - [`AtomicUsize::new`][46287]
2752 - [`AtomicIsize::new`][46287]
2753 - [`AtomicPtr::new`][46287]
2754 - [`Cell::new`][46287]
2755 - [`{integer}::min_value`][46287]
2756 - [`{integer}::max_value`][46287]
2757 - [`mem::size_of`][46287]
2758 - [`mem::align_of`][46287]
2759 - [`ptr::null`][46287]
2760 - [`ptr::null_mut`][46287]
2761 - [`RefCell::new`][46287]
2762 - [`UnsafeCell::new`][46287]
2766 - [Added a `workspace.default-members` config that
2767 overrides implied `--all` in virtual workspaces.][cargo/4743]
2768 - [Enable incremental by default on development builds.][cargo/4817] Also added
2769 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2770 per-project or global basis respectively.
2777 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2778 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2779 in accordance with IETF RFC 4291 §2.2.
2780 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2781 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2782 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2783 - [Leading zeros in tuple struct members is now an error][47084]
2784 - [`column!()` macro is one-based instead of zero-based][46977]
2785 - [`fmt::Arguments` can no longer be shared across threads][45198]
2786 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2787 - [Cargo sets a different working directory for the compiler][cargo/4788]
2789 [44884]: https://github.com/rust-lang/rust/pull/44884
2790 [45198]: https://github.com/rust-lang/rust/pull/45198
2791 [45506]: https://github.com/rust-lang/rust/pull/45506
2792 [45904]: https://github.com/rust-lang/rust/pull/45904
2793 [45990]: https://github.com/rust-lang/rust/pull/45990
2794 [46012]: https://github.com/rust-lang/rust/pull/46012
2795 [46077]: https://github.com/rust-lang/rust/pull/46077
2796 [46094]: https://github.com/rust-lang/rust/pull/46094
2797 [46284]: https://github.com/rust-lang/rust/pull/46284
2798 [46287]: https://github.com/rust-lang/rust/pull/46287
2799 [46293]: https://github.com/rust-lang/rust/pull/46293
2800 [46528]: https://github.com/rust-lang/rust/pull/46528
2801 [46671]: https://github.com/rust-lang/rust/pull/46671
2802 [46713]: https://github.com/rust-lang/rust/pull/46713
2803 [46735]: https://github.com/rust-lang/rust/pull/46735
2804 [46749]: https://github.com/rust-lang/rust/pull/46749
2805 [46760]: https://github.com/rust-lang/rust/pull/46760
2806 [46798]: https://github.com/rust-lang/rust/pull/46798
2807 [46828]: https://github.com/rust-lang/rust/pull/46828
2808 [46831]: https://github.com/rust-lang/rust/pull/46831
2809 [46833]: https://github.com/rust-lang/rust/pull/46833
2810 [46910]: https://github.com/rust-lang/rust/pull/46910
2811 [46977]: https://github.com/rust-lang/rust/pull/46977
2812 [47018]: https://github.com/rust-lang/rust/pull/47018
2813 [47080]: https://github.com/rust-lang/rust/pull/47080
2814 [47084]: https://github.com/rust-lang/rust/pull/47084
2815 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2816 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2817 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2818 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2819 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2820 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2823 Version 1.23.0 (2018-01-04)
2824 ==========================
2828 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2829 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2830 Which should fix some confusing errors in some operations.
2834 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2835 undefined behavior.][45920]
2836 - [rustc now suggests renaming import if names clash.][45660]
2837 - [Display errors/warnings correctly when there are zero-width or
2838 wide characters.][45711]
2839 - [rustc now avoids unnecessary copies of arguments that are
2840 simple bindings][45380] This should improve memory usage on average by 5-10%.
2841 - [Updated musl used to build musl rustc to 1.1.17][45393]
2845 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
2846 - [Implement Hash for raw pointers to unsized types][45483]
2847 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
2848 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
2849 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
2850 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
2851 and `<*mut T>::as_mut`][44932]
2852 - [Optimized `Thread::{park, unpark}` implementation][45524]
2853 - [Improved `SliceExt::binary_search` performance.][45333]
2854 - [impl `FromIterator<()>` for `()`][45379]
2855 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
2863 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
2864 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
2865 - [Added unit test checking to `cargo check`][cargo/4592]
2866 - [Cargo now lets you install a specific version
2867 using `cargo install --version`][cargo/4637]
2871 - [Releases now ship with the Cargo book documentation.][45692]
2872 - [rustdoc now prints rendering warnings on every run.][45324]
2876 - [Changes have been made to type equality to make it more correct,
2877 in rare cases this could break some code.][45853] [Tracking issue for
2878 further information][45852]
2879 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
2880 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
2881 Android 9, the minimum supported version is Android 14.
2882 - [Bumped the minimum LLVM to 3.9][45326]
2884 [44042]: https://github.com/rust-lang/rust/pull/44042
2885 [44932]: https://github.com/rust-lang/rust/pull/44932
2886 [45267]: https://github.com/rust-lang/rust/pull/45267
2887 [45324]: https://github.com/rust-lang/rust/pull/45324
2888 [45326]: https://github.com/rust-lang/rust/pull/45326
2889 [45333]: https://github.com/rust-lang/rust/pull/45333
2890 [45379]: https://github.com/rust-lang/rust/pull/45379
2891 [45380]: https://github.com/rust-lang/rust/pull/45380
2892 [45393]: https://github.com/rust-lang/rust/pull/45393
2893 [45435]: https://github.com/rust-lang/rust/pull/45435
2894 [45483]: https://github.com/rust-lang/rust/pull/45483
2895 [45524]: https://github.com/rust-lang/rust/pull/45524
2896 [45571]: https://github.com/rust-lang/rust/pull/45571
2897 [45580]: https://github.com/rust-lang/rust/pull/45580
2898 [45610]: https://github.com/rust-lang/rust/pull/45610
2899 [45660]: https://github.com/rust-lang/rust/pull/45660
2900 [45692]: https://github.com/rust-lang/rust/pull/45692
2901 [45711]: https://github.com/rust-lang/rust/pull/45711
2902 [45772]: https://github.com/rust-lang/rust/pull/45772
2903 [45852]: https://github.com/rust-lang/rust/issues/45852
2904 [45853]: https://github.com/rust-lang/rust/pull/45853
2905 [45887]: https://github.com/rust-lang/rust/pull/45887
2906 [45920]: https://github.com/rust-lang/rust/pull/45920
2907 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
2908 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
2909 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
2912 Version 1.22.1 (2017-11-22)
2913 ==========================
2915 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
2917 [46183]: https://github.com/rust-lang/rust/pull/46183
2919 Version 1.22.0 (2017-11-22)
2920 ==========================
2924 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
2925 - [Now accepts underscores in unicode escapes][43716]
2926 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
2927 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
2931 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
2932 - [rustc will no longer inline in codegen units when compiling for debug][45075]
2933 This should decrease compile times for debug builds.
2934 - [strict memory alignment now enabled on ARMv6][45094]
2935 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
2939 - [Allow atomic operations up to 32 bits
2940 on `armv5te_unknown_linux_gnueabi`][44978]
2941 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
2942 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
2943 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
2944 - [Properly detect overflow in `Instant += Duration`.][44220]
2945 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
2946 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
2947 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
2954 - [Cargo will now build multi file examples in subdirectories of the `examples`
2955 folder that have a `main.rs` file.][cargo/4496]
2956 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
2957 the old format will continue to work and can be updated with `cargo update`.
2958 - [Now supports vendoring git repositories][cargo/3992]
2962 - [`libbacktrace` is now available on Apple platforms.][44251]
2963 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
2964 This now lets you specify that a given code example will fail to compile.
2968 - [The minimum Android version that rustc can build for has been bumped
2969 to `4.0` from `2.3`][45656]
2970 - [Allowing `T op= &T` for numeric types has broken some type
2971 inference cases][45480]
2974 [42526]: https://github.com/rust-lang/rust/pull/42526
2975 [43017]: https://github.com/rust-lang/rust/pull/43017
2976 [43716]: https://github.com/rust-lang/rust/pull/43716
2977 [43949]: https://github.com/rust-lang/rust/pull/43949
2978 [44015]: https://github.com/rust-lang/rust/pull/44015
2979 [44220]: https://github.com/rust-lang/rust/pull/44220
2980 [44251]: https://github.com/rust-lang/rust/pull/44251
2981 [44287]: https://github.com/rust-lang/rust/pull/44287
2982 [44303]: https://github.com/rust-lang/rust/pull/44303
2983 [44456]: https://github.com/rust-lang/rust/pull/44456
2984 [44466]: https://github.com/rust-lang/rust/pull/44466
2985 [44895]: https://github.com/rust-lang/rust/pull/44895
2986 [44966]: https://github.com/rust-lang/rust/pull/44966
2987 [44978]: https://github.com/rust-lang/rust/pull/44978
2988 [45041]: https://github.com/rust-lang/rust/pull/45041
2989 [45064]: https://github.com/rust-lang/rust/pull/45064
2990 [45075]: https://github.com/rust-lang/rust/pull/45075
2991 [45094]: https://github.com/rust-lang/rust/pull/45094
2992 [45095]: https://github.com/rust-lang/rust/pull/45095
2993 [45480]: https://github.com/rust-lang/rust/issues/45480
2994 [45656]: https://github.com/rust-lang/rust/pull/45656
2995 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
2996 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
2997 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3004 Version 1.21.0 (2017-10-12)
3005 ==========================
3009 - [You can now use static references for literals.][43838]
3013 let x: &'static u32 = &0;
3016 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3019 my_macro!(Vec<i32>::new); // Always worked
3020 my_macro!(Vec::<i32>::new); // Now works
3025 - [Upgraded jemalloc to 4.5.0][43911]
3026 - [Enabled unwinding panics on Redox][43917]
3027 - [Now runs LLVM in parallel during translation phase.][43506]
3028 This should reduce peak memory usage.
3032 - [Generate builtin impls for `Clone` for all arrays and tuples that
3033 are `T: Clone`][43690]
3034 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3035 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3036 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3041 [`std::mem::discriminant`]
3045 - [You can now call `cargo install` with multiple package names][cargo/4216]
3046 - [Cargo commands inside a virtual workspace will now implicitly
3047 pass `--all`][cargo/4335]
3048 - [Added a `[patch]` section to `Cargo.toml` to handle
3049 prepublication dependencies][cargo/4123] [RFC 1969]
3050 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3051 like patterns][cargo/4270]
3052 - [Added the `--all-targets` option][cargo/4400]
3053 - [Using required dependencies as a feature is now deprecated and emits
3054 a warning][cargo/4364]
3059 - [Cargo docs are moving][43916]
3060 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3061 - [The rustdoc book is now available][43863]
3062 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3063 - [Added a preview of RLS has been made available through rustup][44204]
3064 Install with `rustup component add rls-preview`
3065 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3066 Previously only showed `std::os::unix`.
3070 - [Changes in method matching against higher-ranked types][43880] This may cause
3071 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3072 - [rustc's JSON error output's byte position start at top of file.][42973]
3073 Was previously relative to the rustc's internal `CodeMap` struct which
3074 required the unstable library `libsyntax` to correctly use.
3075 - [`unused_results` lint no longer ignores booleans][43728]
3077 [42565]: https://github.com/rust-lang/rust/pull/42565
3078 [42973]: https://github.com/rust-lang/rust/pull/42973
3079 [43348]: https://github.com/rust-lang/rust/pull/43348
3080 [43459]: https://github.com/rust-lang/rust/pull/43459
3081 [43506]: https://github.com/rust-lang/rust/pull/43506
3082 [43540]: https://github.com/rust-lang/rust/pull/43540
3083 [43690]: https://github.com/rust-lang/rust/pull/43690
3084 [43728]: https://github.com/rust-lang/rust/pull/43728
3085 [43838]: https://github.com/rust-lang/rust/pull/43838
3086 [43863]: https://github.com/rust-lang/rust/pull/43863
3087 [43880]: https://github.com/rust-lang/rust/pull/43880
3088 [43911]: https://github.com/rust-lang/rust/pull/43911
3089 [43916]: https://github.com/rust-lang/rust/pull/43916
3090 [43917]: https://github.com/rust-lang/rust/pull/43917
3091 [44204]: https://github.com/rust-lang/rust/pull/44204
3092 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3093 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3094 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3095 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3096 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3097 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3098 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3099 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3100 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3102 Version 1.20.0 (2017-08-31)
3103 ===========================
3107 - [Associated constants are now stabilised.][42809]
3108 - [A lot of macro bugs are now fixed.][42913]
3113 - [Struct fields are now properly coerced to the expected field type.][42807]
3114 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3115 `wasm32-experimental-emscripten` target.
3116 - [Changed some of the error messages to be more helpful.][42033]
3117 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3119 - [rustc now reports the total number of errors on compilation failure][43015]
3120 previously this was only the number of errors in the pass that failed.
3121 - [Expansion in rustc has been sped up 29x.][42533]
3122 - [added `msp430-none-elf` target.][43099]
3123 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3125 - [Fixes backtraces on Redox][43228]
3126 - [rustc now identifies different versions of same crate when absolute paths of
3127 different types match in an error message.][42826]
3133 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3134 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3136 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3137 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3138 - [Impl `Clone` for `DefaultHasher`.][42799]
3139 - [Impl `Sync` for `SyncSender`.][42397]
3140 - [Impl `FromStr` for `char`][42271]
3141 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3143 - [allow messages in the `unimplemented!()` macro.][42155]
3144 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3145 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3146 - [Upgrade to Unicode 10.0.0][42999]
3147 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3148 - [Skip the main thread's manual stack guard on Linux][43072]
3149 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3150 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3152 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3157 - [`CStr::into_c_string`]
3158 - [`CString::as_c_str`]
3159 - [`CString::into_boxed_c_str`]
3160 - [`Chain::get_mut`]
3161 - [`Chain::get_ref`]
3162 - [`Chain::into_inner`]
3163 - [`Option::get_or_insert_with`]
3164 - [`Option::get_or_insert`]
3165 - [`OsStr::into_os_string`]
3166 - [`OsString::into_boxed_os_str`]
3169 - [`Utf8Error::error_len`]
3170 - [`char::EscapeDebug`]
3171 - [`char::escape_debug`]
3172 - [`compile_error!`]
3173 - [`f32::from_bits`]
3175 - [`f64::from_bits`]
3177 - [`mem::ManuallyDrop`]
3178 - [`slice::sort_unstable_by_key`]
3179 - [`slice::sort_unstable_by`]
3180 - [`slice::sort_unstable`]
3181 - [`str::from_boxed_utf8_unchecked`]
3182 - [`str::as_bytes_mut`]
3183 - [`str::as_bytes_mut`]
3184 - [`str::from_utf8_mut`]
3185 - [`str::from_utf8_unchecked_mut`]
3187 - [`str::get_unchecked_mut`]
3188 - [`str::get_unchecked`]
3190 - [`str::into_boxed_bytes`]
3195 - [Cargo API token location moved from `~/.cargo/config` to
3196 `~/.cargo/credentials`.][cargo/3978]
3197 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3198 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3199 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3200 - [You can now specify version of a binary when installed through
3201 `cargo install` using `--vers`.][cargo/4229]
3202 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3203 failure.][cargo/4248]
3204 - [Changed the convention around which file is the crate root.][cargo/4259]
3205 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3206 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3211 - [Functions with `'static` in their return types will now not be as usable as
3212 if they were using lifetime parameters instead.][42417]
3213 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3214 takes the sign of NaN into account where previously didn't.][42430]
3216 [42033]: https://github.com/rust-lang/rust/pull/42033
3217 [42155]: https://github.com/rust-lang/rust/pull/42155
3218 [42271]: https://github.com/rust-lang/rust/pull/42271
3219 [42397]: https://github.com/rust-lang/rust/pull/42397
3220 [42417]: https://github.com/rust-lang/rust/pull/42417
3221 [42430]: https://github.com/rust-lang/rust/pull/42430
3222 [42431]: https://github.com/rust-lang/rust/pull/42431
3223 [42533]: https://github.com/rust-lang/rust/pull/42533
3224 [42571]: https://github.com/rust-lang/rust/pull/42571
3225 [42613]: https://github.com/rust-lang/rust/pull/42613
3226 [42799]: https://github.com/rust-lang/rust/pull/42799
3227 [42807]: https://github.com/rust-lang/rust/pull/42807
3228 [42809]: https://github.com/rust-lang/rust/pull/42809
3229 [42822]: https://github.com/rust-lang/rust/pull/42822
3230 [42826]: https://github.com/rust-lang/rust/pull/42826
3231 [42854]: https://github.com/rust-lang/rust/pull/42854
3232 [42913]: https://github.com/rust-lang/rust/pull/42913
3233 [42999]: https://github.com/rust-lang/rust/pull/42999
3234 [43011]: https://github.com/rust-lang/rust/pull/43011
3235 [43015]: https://github.com/rust-lang/rust/pull/43015
3236 [43072]: https://github.com/rust-lang/rust/pull/43072
3237 [43077]: https://github.com/rust-lang/rust/pull/43077
3238 [43097]: https://github.com/rust-lang/rust/pull/43097
3239 [43099]: https://github.com/rust-lang/rust/pull/43099
3240 [43170]: https://github.com/rust-lang/rust/pull/43170
3241 [43178]: https://github.com/rust-lang/rust/pull/43178
3242 [43185]: https://github.com/rust-lang/rust/pull/43185
3243 [43228]: https://github.com/rust-lang/rust/pull/43228
3244 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3245 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3246 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3247 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3248 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3249 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3250 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3251 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3252 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3253 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3254 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3255 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3256 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3257 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3258 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3259 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3260 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3261 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3262 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3263 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3264 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3265 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3266 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3267 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3268 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3269 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3270 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3271 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3272 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3273 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3274 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3275 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3276 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3277 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3278 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3279 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3280 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3281 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3282 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3285 Version 1.19.0 (2017-07-20)
3286 ===========================
3291 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3292 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3293 - [Macro recursion limit increased to 1024 from 64.][41676]
3294 - [Added lint for detecting unused macros.][41907]
3295 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3296 For example: `let x = loop { break 7; };`
3297 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3298 contain `Copy` types and cannot have a `Drop` implementation.
3299 Example: `union Foo { bar: u8, baz: usize }`
3300 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3301 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3306 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3307 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3308 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3309 you should use `--target armv7-linux-androideabi`.
3310 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3311 - [Minor optimisation of string operations.][42037]
3312 - [Compiler error message is now `aborting due to previous error(s)` instead of
3313 `aborting due to N previous errors`][42150] This was previously inaccurate and
3314 would only count certain kinds of errors.
3315 - [The compiler now supports Visual Studio 2017][42225]
3316 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3317 - [Added a lot][42264] of [new error codes][42302]
3318 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3319 libraries with C Run-time Libraries(CRT) to be statically linked.
3320 - [Fixed various ARM codegen bugs][42740]
3325 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3326 `Extend<Cow<'a, str>>`][41449]
3327 - [`Vec` now implements `From<&mut [T]>`][41530]
3328 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3329 - [`SplitWhitespace` now implements `Clone`][41659]
3330 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3332 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3333 macros, but for printing to stderr.
3338 - [`OsString::shrink_to_fit`]
3341 - [`thread::ThreadId`]
3346 - [Build scripts can now add environment variables to the environment
3347 the crate is being compiled in.
3348 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3349 - [Subcommands now replace the current process rather than spawning a new
3350 child process][cargo/3970]
3351 - [Workspace members can now accept glob file patterns][cargo/3979]
3352 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3353 the members in a given workspace.][cargo/3988]
3354 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3355 - [Target directory path is now in the cargo metadata][cargo/4022]
3356 - [Cargo no longer checks out a local working directory for the
3357 crates.io index][cargo/4026] This should provide smaller file size for the
3358 registry, and improve cloning times, especially on Windows machines.
3359 - [Added an `--exclude` option for excluding certain packages when using the
3360 `--all` option][cargo/4031]
3361 - [Cargo will now automatically retry when receiving a 5xx error
3362 from crates.io][cargo/4032]
3363 - [The `--features` option now accepts multiple comma or space
3364 delimited values.][cargo/4084]
3365 - [Added support for custom target specific runners][cargo/3954]
3370 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3372 - [Rust will now release XZ compressed packages][rust-installer/57]
3373 - [rustup will now prefer to download rust packages with
3374 XZ compression][rustup/1100] over GZip packages.
3375 - [Added the ability to escape `#` in rust documentation][41785] By adding
3376 additional `#`'s ie. `##` is now `#`
3381 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3382 - [`-Z` flags are now no longer allowed to be used on the stable
3383 compiler.][41751] This has been a warning for a year previous to this.
3384 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3385 longer works][42844]. Users should migrate to the built-in `check`
3386 command, which has been available since 1.16.
3387 - [Ending a float literal with `._` is now a hard error.
3388 Example: `42._` .][41946]
3389 - [Any use of a private `extern crate` outside of its module is now a
3390 hard error.][36886] This was previously a warning.
3391 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3392 relative while the `::` prefix makes a path absolute, but was ignored and the
3393 path was relative regardless.
3394 - [Floating point constants in match patterns is now a hard error][36890]
3395 This was previously a warning.
3396 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3397 match patterns is now a hard error][36891] This was previously a warning.
3398 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3400 - [From the pound escape, lines consisting of multiple `#`s are
3402 - [It is an error to re-export private enum variants][42460]. This is
3403 known to break a number of crates that depend on an older version of
3405 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3406 to use it to find the linker, and the build will fail where it did
3407 not previously][42607]
3409 [36886]: https://github.com/rust-lang/rust/issues/36886
3410 [36888]: https://github.com/rust-lang/rust/issues/36888
3411 [36890]: https://github.com/rust-lang/rust/issues/36890
3412 [36891]: https://github.com/rust-lang/rust/issues/36891
3413 [36892]: https://github.com/rust-lang/rust/issues/36892
3414 [37406]: https://github.com/rust-lang/rust/issues/37406
3415 [39983]: https://github.com/rust-lang/rust/pull/39983
3416 [41145]: https://github.com/rust-lang/rust/pull/41145
3417 [41192]: https://github.com/rust-lang/rust/pull/41192
3418 [41258]: https://github.com/rust-lang/rust/pull/41258
3419 [41370]: https://github.com/rust-lang/rust/pull/41370
3420 [41449]: https://github.com/rust-lang/rust/pull/41449
3421 [41530]: https://github.com/rust-lang/rust/pull/41530
3422 [41624]: https://github.com/rust-lang/rust/pull/41624
3423 [41656]: https://github.com/rust-lang/rust/pull/41656
3424 [41659]: https://github.com/rust-lang/rust/pull/41659
3425 [41676]: https://github.com/rust-lang/rust/pull/41676
3426 [41751]: https://github.com/rust-lang/rust/pull/41751
3427 [41764]: https://github.com/rust-lang/rust/pull/41764
3428 [41785]: https://github.com/rust-lang/rust/pull/41785
3429 [41873]: https://github.com/rust-lang/rust/pull/41873
3430 [41907]: https://github.com/rust-lang/rust/pull/41907
3431 [41946]: https://github.com/rust-lang/rust/pull/41946
3432 [42016]: https://github.com/rust-lang/rust/pull/42016
3433 [42037]: https://github.com/rust-lang/rust/pull/42037
3434 [42068]: https://github.com/rust-lang/rust/pull/42068
3435 [42150]: https://github.com/rust-lang/rust/pull/42150
3436 [42162]: https://github.com/rust-lang/rust/pull/42162
3437 [42225]: https://github.com/rust-lang/rust/pull/42225
3438 [42264]: https://github.com/rust-lang/rust/pull/42264
3439 [42302]: https://github.com/rust-lang/rust/pull/42302
3440 [42460]: https://github.com/rust-lang/rust/issues/42460
3441 [42607]: https://github.com/rust-lang/rust/issues/42607
3442 [42740]: https://github.com/rust-lang/rust/pull/42740
3443 [42844]: https://github.com/rust-lang/rust/issues/42844
3444 [42948]: https://github.com/rust-lang/rust/pull/42948
3445 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3446 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3447 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3448 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3449 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3450 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3451 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3452 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3453 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3454 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3455 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3456 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3457 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3458 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3459 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3460 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3461 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3462 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3463 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3464 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3465 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3466 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3469 Version 1.18.0 (2017-06-08)
3470 ===========================
3475 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3476 make the item visible to just that module tree. Also accepts the keyword
3477 `crate` to make something public to the whole crate but not users of the
3478 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3479 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3480 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3481 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3482 types like `Write + Send`, trailing `+` are now supported in trait objects,
3483 and better error reporting for trait objects starting with `?Sized`.
3484 - [0e+10 is now a valid floating point literal][40589]
3485 - [Now warns if you bind a lifetime parameter to 'static][40734]
3486 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3487 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3488 representation in some cases.][40377]
3493 - [rustc can now emit mir with `--emit mir`][39891]
3494 - [Improved LLVM IR for trivial functions][40367]
3495 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3496 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3497 opportunities found through profiling
3498 - [Improved backtrace formatting when panicking][38165]
3503 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3504 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3505 iteration or reallocation.
3506 - [Simplified HashMap Bucket interface][40561] provides performance
3507 improvements for iterating and cloning.
3508 - [Specialize Vec::from_elem to use calloc][40409]
3509 - [Fixed Race condition in fs::create_dir_all][39799]
3510 - [No longer caching stdio on Windows][40516]
3511 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3512 2.50%~ faster and in one case now 12.50% faster.
3513 - [Optimized `AtomicBool::fetch_nand`][41143]
3518 - [`Child::try_wait`]
3519 - [`HashMap::retain`]
3520 - [`HashSet::retain`]
3522 - [`TcpStream::peek`]
3523 - [`UdpSocket::peek`]
3524 - [`UdpSocket::peek_from`]
3529 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3530 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3531 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3532 - [Added Android build support][cargo/3885]
3533 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3534 of a certain type, for example `cargo build --bins` will build all
3536 - [Added support for haiku][cargo/3952]
3541 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3542 - [Added rust-windbg script for better debugging on Windows][39983]
3543 - [Rust now uses the official cross compiler for NetBSD][40612]
3544 - [rustdoc now accepts `#` at the start of files][40828]
3545 - [Fixed jemalloc support for musl][41168]
3550 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3551 always placed after the sign if it exists and before the digits. With the `#`
3552 flag the zeroes are placed after the prefix and before the digits.
3553 - [Due to the struct field optimisation][40377], using `transmute` on structs
3554 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3555 always been undefined behavior, but is now more likely to break in practice.
3556 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3557 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3558 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3559 - [Overlapping inherent `impl`s are now a hard error][40728]
3560 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3561 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3562 `out.asm` and `out.ll` instead of only one of the filetypes.
3563 - [ calling a function that returns `Self` will no longer work][41805] when
3564 the size of `Self` cannot be statically determined.
3565 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3566 this has caused a few regressions namely:
3568 - Changed the link order of local static/dynamic libraries (respecting the
3569 order on given rather than having the compiler reorder).
3570 - Changed how MinGW is linked, native code linked to dynamic libraries
3571 may require manually linking to the gcc support library (for the native
3574 [38165]: https://github.com/rust-lang/rust/pull/38165
3575 [39799]: https://github.com/rust-lang/rust/pull/39799
3576 [39891]: https://github.com/rust-lang/rust/pull/39891
3577 [39983]: https://github.com/rust-lang/rust/pull/39983
3578 [40043]: https://github.com/rust-lang/rust/pull/40043
3579 [40241]: https://github.com/rust-lang/rust/pull/40241
3580 [40338]: https://github.com/rust-lang/rust/pull/40338
3581 [40367]: https://github.com/rust-lang/rust/pull/40367
3582 [40377]: https://github.com/rust-lang/rust/pull/40377
3583 [40409]: https://github.com/rust-lang/rust/pull/40409
3584 [40516]: https://github.com/rust-lang/rust/pull/40516
3585 [40556]: https://github.com/rust-lang/rust/pull/40556
3586 [40561]: https://github.com/rust-lang/rust/pull/40561
3587 [40589]: https://github.com/rust-lang/rust/pull/40589
3588 [40612]: https://github.com/rust-lang/rust/pull/40612
3589 [40723]: https://github.com/rust-lang/rust/pull/40723
3590 [40728]: https://github.com/rust-lang/rust/pull/40728
3591 [40731]: https://github.com/rust-lang/rust/pull/40731
3592 [40734]: https://github.com/rust-lang/rust/pull/40734
3593 [40805]: https://github.com/rust-lang/rust/pull/40805
3594 [40807]: https://github.com/rust-lang/rust/pull/40807
3595 [40828]: https://github.com/rust-lang/rust/pull/40828
3596 [40870]: https://github.com/rust-lang/rust/pull/40870
3597 [41085]: https://github.com/rust-lang/rust/pull/41085
3598 [41143]: https://github.com/rust-lang/rust/pull/41143
3599 [41168]: https://github.com/rust-lang/rust/pull/41168
3600 [41270]: https://github.com/rust-lang/rust/issues/41270
3601 [41469]: https://github.com/rust-lang/rust/pull/41469
3602 [41805]: https://github.com/rust-lang/rust/issues/41805
3603 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3604 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3605 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3606 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3607 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3608 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3609 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3610 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3611 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3612 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3613 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3614 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3615 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3616 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3619 Version 1.17.0 (2017-04-27)
3620 ===========================
3625 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3626 * [Fields of structs may be initialized without duplicating the field/variable
3627 names][39761]. [RFC 1682]
3628 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3629 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3630 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3631 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3632 `'b`. Soundness fix.
3633 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3634 * [Static variables may contain references to other statics][40027]
3639 * [Exit quickly on only `--emit dep-info`][40336]
3640 * [Make `-C relocation-model` more correctly determine whether the linker
3641 creates a position-independent executable][40245]
3642 * [Add `-C overflow-checks` to directly control whether integer overflow
3644 * [The rustc type checker now checks items on demand instead of in a single
3645 in-order pass][40008]. This is mostly an internal refactoring in support of
3646 future work, including incremental type checking, but also resolves [RFC
3647 1647], allowing `Self` to appear in `impl` `where` clauses.
3648 * [Optimize vtable loads][39995]
3649 * [Turn off vectorization for Emscripten targets][39990]
3650 * [Provide suggestions for unknown macros imported with `use`][39953]
3651 * [Fix ICEs in path resolution][39939]
3652 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3653 * [Add clearer error message using `&str + &str`][39116]
3664 * [`Ordering::then`]
3665 * [`Ordering::then_with`]
3666 * [`BTreeMap::range`]
3667 * [`BTreeMap::range_mut`]
3668 * [`collections::Bound`]
3669 * [`process::abort`]
3670 * [`ptr::read_unaligned`]
3671 * [`ptr::write_unaligned`]
3672 * [`Result::expect_err`]
3675 * [`Cell::into_inner`]
3681 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
3682 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
3683 * [`String` implements `FromIterator<&char>`][40028]
3684 * `Box` [implements][40009] a number of new conversions:
3685 `From<Box<str>> for String`,
3686 `From<Box<[T]>> for Vec<T>`,
3687 `From<Box<CStr>> for CString`,
3688 `From<Box<OsStr>> for OsString`,
3689 `From<Box<Path>> for PathBuf`,
3690 `Into<Box<str>> for String`,
3691 `Into<Box<[T]>> for Vec<T>`,
3692 `Into<Box<CStr>> for CString`,
3693 `Into<Box<OsStr>> for OsString`,
3694 `Into<Box<Path>> for PathBuf`,
3695 `Default for Box<str>`,
3696 `Default for Box<CStr>`,
3697 `Default for Box<OsStr>`,
3698 `From<&CStr> for Box<CStr>`,
3699 `From<&OsStr> for Box<OsStr>`,
3700 `From<&Path> for Box<Path>`
3701 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
3702 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
3703 * [Slightly optimize `slice::sort`][39538]
3704 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
3705 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
3706 `Box<str>` implements `From<&str>`][39438]
3707 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
3708 `From<(I, u16)> where I: Into<IpAddr>`][39372]
3709 * [`format!` estimates the needed capacity before writing a string][39356]
3710 * [Support unprivileged symlink creation in Windows][38921]
3711 * [`PathBuf` implements `Default`][38764]
3712 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
3713 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
3714 and poor hash functions.
3719 * [Add `cargo check --all`][cargo/3731]
3720 * [Add an option to ignore SSL revocation checking][cargo/3699]
3721 * [Add `cargo run --package`][cargo/3691]
3722 * [Add `required_features`][cargo/3667]
3723 * [Assume `build.rs` is a build script][cargo/3664]
3724 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
3729 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
3731 * [The "Unstable Book" documents nightly-only features][ubook]
3732 * [Improve the style of the sidebar in rustdoc output][40265]
3733 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
3734 * [Fix MSP430 breakage due to `i128`][40257]
3735 * [Preliminary Solaris/SPARCv9 support][39903]
3736 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
3737 run without installing the MSVC runtime.
3738 * [`rustdoc --test` includes file names in test names][39788]
3739 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
3740 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
3741 * [Initial support for `aarch64-unknown-freebsd`][39491]
3742 * [Initial support for `i686-unknown-netbsd`][39426]
3743 * [This release no longer includes the old makefile build system][39431]. Rust
3744 is built with a custom build system, written in Rust, and with Cargo.
3745 * [Add Debug implementations for libcollection structs][39002]
3746 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
3747 * [`--test-threads=0` produces an error][38945]
3748 * [`rustup` installs documentation by default][40526]
3749 * [The Rust source includes NatVis visualizations][39843]. These can be used by
3750 WinDbg and Visual Studio to improve the debugging experience.
3755 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3756 workaround, either use MSVC 2015 or run vcvars.bat.
3757 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3758 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3759 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3761 * [`format!` and `Display::to_string` panic if an underlying formatting
3762 implementation returns an error][40117]. Previously the error was silently
3763 ignored. It is incorrect for `write_fmt` to return an error when writing
3765 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3766 crates were marked stable and could be accessed from the stable toolchain.
3767 * [Rust git source no longer includes vendored crates][39728]. Those that need
3768 to build with vendored crates should build from release tarballs.
3769 * [Fix inert attributes from `proc_macro_derives`][39572]
3770 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3771 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3773 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3774 existing code generally ignores the type of dead-code unless a type-hint is
3775 provided; this can cause surprising inference interactions particularly around
3776 defaulting. The new code uniformly ignores the result type of dead-code.
3777 * [Tuple-struct constructors with private fields are no longer visible][38932]
3778 * [Lifetime parameters that do not appear in the arguments are now considered
3779 early-bound][38897], resolving a soundness bug (#[32330]). The
3780 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3782 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3783 * [Make transmuting from fn item types to pointer-sized types a hard
3786 [27787]: https://github.com/rust-lang/rust/issues/27787
3787 [32330]: https://github.com/rust-lang/rust/issues/32330
3788 [34198]: https://github.com/rust-lang/rust/pull/34198
3789 [38161]: https://github.com/rust-lang/rust/pull/38161
3790 [38368]: https://github.com/rust-lang/rust/pull/38368
3791 [38584]: https://github.com/rust-lang/rust/issues/38584
3792 [38661]: https://github.com/rust-lang/rust/pull/38661
3793 [38764]: https://github.com/rust-lang/rust/pull/38764
3794 [38864]: https://github.com/rust-lang/rust/issues/38864
3795 [38897]: https://github.com/rust-lang/rust/pull/38897
3796 [38921]: https://github.com/rust-lang/rust/pull/38921
3797 [38932]: https://github.com/rust-lang/rust/pull/38932
3798 [38945]: https://github.com/rust-lang/rust/pull/38945
3799 [38981]: https://github.com/rust-lang/rust/pull/38981
3800 [39002]: https://github.com/rust-lang/rust/pull/39002
3801 [39116]: https://github.com/rust-lang/rust/pull/39116
3802 [39193]: https://github.com/rust-lang/rust/pull/39193
3803 [39265]: https://github.com/rust-lang/rust/pull/39265
3804 [39356]: https://github.com/rust-lang/rust/pull/39356
3805 [39372]: https://github.com/rust-lang/rust/pull/39372
3806 [39426]: https://github.com/rust-lang/rust/pull/39426
3807 [39431]: https://github.com/rust-lang/rust/pull/39431
3808 [39438]: https://github.com/rust-lang/rust/pull/39438
3809 [39440]: https://github.com/rust-lang/rust/pull/39440
3810 [39485]: https://github.com/rust-lang/rust/pull/39485
3811 [39491]: https://github.com/rust-lang/rust/pull/39491
3812 [39518]: https://github.com/rust-lang/rust/pull/39518
3813 [39538]: https://github.com/rust-lang/rust/pull/39538
3814 [39572]: https://github.com/rust-lang/rust/pull/39572
3815 [39633]: https://github.com/rust-lang/rust/pull/39633
3816 [39642]: https://github.com/rust-lang/rust/pull/39642
3817 [39728]: https://github.com/rust-lang/rust/pull/39728
3818 [39761]: https://github.com/rust-lang/rust/pull/39761
3819 [39788]: https://github.com/rust-lang/rust/pull/39788
3820 [39793]: https://github.com/rust-lang/rust/pull/39793
3821 [39837]: https://github.com/rust-lang/rust/pull/39837
3822 [39843]: https://github.com/rust-lang/rust/pull/39843
3823 [39851]: https://github.com/rust-lang/rust/pull/39851
3824 [39903]: https://github.com/rust-lang/rust/pull/39903
3825 [39939]: https://github.com/rust-lang/rust/pull/39939
3826 [39953]: https://github.com/rust-lang/rust/pull/39953
3827 [39960]: https://github.com/rust-lang/rust/pull/39960
3828 [39990]: https://github.com/rust-lang/rust/pull/39990
3829 [39995]: https://github.com/rust-lang/rust/pull/39995
3830 [40008]: https://github.com/rust-lang/rust/pull/40008
3831 [40009]: https://github.com/rust-lang/rust/pull/40009
3832 [40027]: https://github.com/rust-lang/rust/pull/40027
3833 [40028]: https://github.com/rust-lang/rust/pull/40028
3834 [40037]: https://github.com/rust-lang/rust/pull/40037
3835 [40117]: https://github.com/rust-lang/rust/pull/40117
3836 [40166]: https://github.com/rust-lang/rust/pull/40166
3837 [40245]: https://github.com/rust-lang/rust/pull/40245
3838 [40257]: https://github.com/rust-lang/rust/pull/40257
3839 [40261]: https://github.com/rust-lang/rust/pull/40261
3840 [40265]: https://github.com/rust-lang/rust/pull/40265
3841 [40319]: https://github.com/rust-lang/rust/pull/40319
3842 [40336]: https://github.com/rust-lang/rust/pull/40336
3843 [40526]: https://github.com/rust-lang/rust/pull/40526
3844 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3845 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
3846 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
3847 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
3848 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
3849 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
3850 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
3851 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
3852 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
3853 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
3854 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
3855 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
3856 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
3857 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
3858 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
3859 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
3860 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
3861 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
3862 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
3863 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
3864 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
3865 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
3866 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
3867 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
3868 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
3869 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
3870 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
3871 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
3872 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
3873 [mdbook]: https://crates.io/crates/mdbook
3874 [ubook]: https://doc.rust-lang.org/unstable-book/
3877 Version 1.16.0 (2017-03-16)
3878 ===========================
3883 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3884 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3885 match patterns][38069]
3886 * [Clean up semantics of `self` in an import list][38313]
3887 * [`Self` may appear in `impl` headers][38920]
3888 * [`Self` may appear in struct expressions][39282]
3893 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
3894 a `.rmeta` file containing only crate metadata][38571]. This can be
3895 used by tools like the Rust Language Service to perform
3896 metadata-only builds.
3897 * [Levenshtein based typo suggestions now work in most places, while
3898 previously they worked only for fields and sometimes for local
3899 variables][38927]. Together with the overhaul of "no
3900 resolution"/"unexpected resolution" errors (#[38154]) they result in
3901 large and systematic improvement in resolution diagnostics.
3902 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
3904 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
3905 * [`rustc` no longer attempts to provide "consider using an explicit
3906 lifetime" suggestions][37057]. They were inaccurate.
3911 * [`VecDeque::truncate`]
3912 * [`VecDeque::resize`]
3913 * [`String::insert_str`]
3914 * [`Duration::checked_add`]
3915 * [`Duration::checked_sub`]
3916 * [`Duration::checked_div`]
3917 * [`Duration::checked_mul`]
3920 * [`SocketAddr::is_ipv4`]
3921 * [`SocketAddr::is_ipv6`]
3922 * [`IpAddr::is_ipv4`]
3923 * [`IpAddr::is_ipv6`]
3925 * [`Vec::dedup_by_key`]
3926 * [`Result::unwrap_or_default`]
3927 * [`<*const T>::wrapping_offset`]
3928 * [`<*mut T>::wrapping_offset`]
3929 * `CommandExt::creation_flags`
3930 * [`File::set_permissions`]
3931 * [`String::split_off`]
3936 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
3937 their argument by `Borrow` parameter][37761]
3938 * [All public types in std implement `Debug`][38006]
3939 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
3940 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
3941 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3943 * [std: Fix partial writes in `LineWriter`][38062]
3944 * [std: Clamp max read/write sizes on Unix][38062]
3945 * [Use more specific panic message for `&str` slicing errors][38066]
3946 * [`TcpListener::set_only_v6` is deprecated][38304]. This
3947 functionality cannot be achieved in std currently.
3948 * [`writeln!`, like `println!`, now accepts a form with no string
3949 or formatting arguments, to just print a newline][38469]
3950 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
3951 * [Reduce the size of static data in `std_unicode::tables`][38781]
3952 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
3953 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
3955 * [`Duration` implements `Sum`][38712]
3956 * [`String` implements `ToSocketAddrs`][39048]
3961 * [The `cargo check` command does a type check of a project without
3962 building it][cargo/3296]
3963 * [crates.io will display CI badges from Travis and AppVeyor, if
3964 specified in Cargo.toml][cargo/3546]
3965 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
3966 * [Compilation profiles accept integer values for `debug`, in addition
3967 to `true` and `false`. These are passed to `rustc` as the value to
3968 `-C debuginfo`][cargo/3534]
3969 * [Implement `cargo --version --verbose`][cargo/3604]
3970 * [All builds now output 'dep-info' build dependencies compatible with
3971 make and ninja][cargo/3557]
3972 * [Build all workspace members with `build --all`][cargo/3511]
3973 * [Document all workspace members with `doc --all`][cargo/3515]
3974 * [Path deps outside workspace are not members][cargo/3443]
3979 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
3980 the path to the Rust implementation][38589]
3981 * [The `armv7-linux-androideabi` target no longer enables NEON
3982 extensions, per Google's ABI guide][38413]
3983 * [The stock standard library can be compiled for Redox OS][38401]
3984 * [Rust has initial SPARC support][38726]. Tier 3. No builds
3986 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
3988 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
3993 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3994 match patterns][38069]
3995 * In this release, references to uninhabited types can not be
3996 pattern-matched. This was accidentally allowed in 1.15.
3997 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3998 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4000 * [Clean up semantics of `self` in an import list][38313]
4001 * Reimplemented lifetime elision. This change was almost entirely compatible
4002 with existing code, but it did close a number of small bugs and loopholes,
4003 as well as being more accepting in some other [cases][41105].
4005 [37057]: https://github.com/rust-lang/rust/pull/37057
4006 [37761]: https://github.com/rust-lang/rust/pull/37761
4007 [38006]: https://github.com/rust-lang/rust/pull/38006
4008 [38051]: https://github.com/rust-lang/rust/pull/38051
4009 [38062]: https://github.com/rust-lang/rust/pull/38062
4010 [38062]: https://github.com/rust-lang/rust/pull/38622
4011 [38066]: https://github.com/rust-lang/rust/pull/38066
4012 [38069]: https://github.com/rust-lang/rust/pull/38069
4013 [38131]: https://github.com/rust-lang/rust/pull/38131
4014 [38154]: https://github.com/rust-lang/rust/pull/38154
4015 [38274]: https://github.com/rust-lang/rust/pull/38274
4016 [38304]: https://github.com/rust-lang/rust/pull/38304
4017 [38313]: https://github.com/rust-lang/rust/pull/38313
4018 [38314]: https://github.com/rust-lang/rust/pull/38314
4019 [38327]: https://github.com/rust-lang/rust/pull/38327
4020 [38401]: https://github.com/rust-lang/rust/pull/38401
4021 [38413]: https://github.com/rust-lang/rust/pull/38413
4022 [38469]: https://github.com/rust-lang/rust/pull/38469
4023 [38559]: https://github.com/rust-lang/rust/pull/38559
4024 [38571]: https://github.com/rust-lang/rust/pull/38571
4025 [38580]: https://github.com/rust-lang/rust/pull/38580
4026 [38589]: https://github.com/rust-lang/rust/pull/38589
4027 [38670]: https://github.com/rust-lang/rust/pull/38670
4028 [38712]: https://github.com/rust-lang/rust/pull/38712
4029 [38726]: https://github.com/rust-lang/rust/pull/38726
4030 [38781]: https://github.com/rust-lang/rust/pull/38781
4031 [38798]: https://github.com/rust-lang/rust/pull/38798
4032 [38909]: https://github.com/rust-lang/rust/pull/38909
4033 [38920]: https://github.com/rust-lang/rust/pull/38920
4034 [38927]: https://github.com/rust-lang/rust/pull/38927
4035 [39048]: https://github.com/rust-lang/rust/pull/39048
4036 [39282]: https://github.com/rust-lang/rust/pull/39282
4037 [39379]: https://github.com/rust-lang/rust/pull/39379
4038 [41105]: https://github.com/rust-lang/rust/issues/41105
4039 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4040 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4041 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4042 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4043 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4044 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4045 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4046 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4047 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4048 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4049 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4050 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4051 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4052 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4053 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4054 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4055 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4056 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4057 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4058 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4059 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4060 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4061 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4062 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4063 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4064 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4065 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4066 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4067 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4068 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4071 Version 1.15.1 (2017-02-09)
4072 ===========================
4074 * [Fix IntoIter::as_mut_slice's signature][39466]
4075 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4077 [39466]: https://github.com/rust-lang/rust/pull/39466
4078 [39523]: https://github.com/rust-lang/rust/pull/39523
4081 Version 1.15.0 (2017-02-02)
4082 ===========================
4087 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4088 stable. This allows popular code-generating crates like Serde and Diesel to
4089 work ergonomically. [RFC 1681].
4090 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4091 with curly braces][36868]. Part of [RFC 1506].
4092 * [A number of minor changes to name resolution have been activated][37127].
4093 They add up to more consistent semantics, allowing for future evolution of
4094 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4095 details of what is different. The breaking changes here have been transitioned
4096 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4097 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4099 * [`?Sized` can be used in `where` clauses][37791]
4100 * [There is now a limit on the size of monomorphized types and it can be
4101 modified with the `#![type_size_limit]` crate attribute, similarly to
4102 the `#![recursion_limit]` attribute][37789]
4107 * [On Windows, the compiler will apply dllimport attributes when linking to
4108 extern functions][37973]. Additional attributes and flags can control which
4109 library kind is linked and its name. [RFC 1717].
4110 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4111 * [The `--test` flag works with procedural macro crates][38107]
4112 * [Fix `extern "aapcs" fn` ABI][37814]
4113 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4114 * [The `format!` expander recognizes incorrect `printf` and shell-style
4115 formatting directives and suggests the correct format][37613].
4116 * [Only report one error for all unused imports in an import list][37456]
4118 Compiler Performance
4119 --------------------
4121 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4122 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4123 * [Don't clone in `UnificationTable::probe`][37848]
4124 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4125 * [Use small vectors in type walker][37760]
4126 * [Macro expansion performance was improved][37701]
4127 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4128 * [Replace FNV with a faster hash function][37229]
4133 * [`std::iter::Iterator::min_by`]
4134 * [`std::iter::Iterator::max_by`]
4135 * [`std::os::*::fs::FileExt`]
4136 * [`std::sync::atomic::Atomic*::get_mut`]
4137 * [`std::sync::atomic::Atomic*::into_inner`]
4138 * [`std::vec::IntoIter::as_slice`]
4139 * [`std::vec::IntoIter::as_mut_slice`]
4140 * [`std::sync::mpsc::Receiver::try_iter`]
4141 * [`std::os::unix::process::CommandExt::before_exec`]
4142 * [`std::rc::Rc::strong_count`]
4143 * [`std::rc::Rc::weak_count`]
4144 * [`std::sync::Arc::strong_count`]
4145 * [`std::sync::Arc::weak_count`]
4146 * [`std::char::encode_utf8`]
4147 * [`std::char::encode_utf16`]
4148 * [`std::cell::Ref::clone`]
4149 * [`std::io::Take::into_inner`]
4154 * [The standard sorting algorithm has been rewritten for dramatic performance
4155 improvements][38192]. It is a hybrid merge sort, drawing influences from
4156 Timsort. Previously it was a naive merge sort.
4157 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4158 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4160 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4161 and `char_indices().last()`][37882]
4162 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4163 * [Chinese characters display correctly in `fmt::Debug`][37855]
4164 * [Derive `Default` for `Duration`][37699]
4165 * [Support creation of anonymous pipes on WinXP/2k][37677]
4166 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4167 * [Don't pass overlapped handles to processes][38835]
4172 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4173 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4174 should instead check the variable at runtime with `std::env`. That the value
4175 was set at build time was a bug, and incorrect when cross-compiling. This
4176 change is known to cause breakage.
4177 * [Add `--all` flag to `cargo test`][cargo/3221]
4178 * [Compile statically against the MSVC CRT][cargo/3363]
4179 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4180 * [Link OpenSSL statically on OSX][cargo/3311]
4181 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4182 * [Test for bad path overrides with summaries][cargo/3336]
4183 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4184 * [Fix retrying crate downloads for network errors][cargo/3348]
4185 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4186 * [Emit more info on --message-format=json][cargo/3319]
4187 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4188 * [Don't ignore errors in workspace manifest][cargo/3409]
4189 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4194 * [Test runners (binaries built with `--test`) now support a `--list` argument
4195 that lists the tests it contains][38185]
4196 * [Test runners now support a `--exact` argument that makes the test filter
4197 match exactly, instead of matching only a substring of the test name][38181]
4198 * [rustdoc supports a `--playground-url` flag][37763]
4199 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4204 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4205 continue to be used in this release by passing `--disable-rustbuild` to the
4206 configure script, but they will be deleted soon. Note that the new build
4207 system uses a different on-disk layout that will likely affect any scripts
4209 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4211 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4212 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4218 * [A number of minor changes to name resolution have been activated][37127].
4219 They add up to more consistent semantics, allowing for future evolution of
4220 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4221 details of what is different. The breaking changes here have been transitioned
4222 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4223 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4224 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4225 should instead check the variable at runtime with `std::env`. That the value
4226 was set at build time was a bug, and incorrect when cross-compiling. This
4227 change is known to cause breakage.
4228 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4229 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4230 1.10 and is now an error by default. It will become a hard error in the near
4232 * [The semantics relating modules to file system directories are changing in
4233 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4234 lint, which is a warning in this release, and will become a hard error in the
4236 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4237 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4238 the underlying iterator][37834]
4240 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4241 [33685]: https://github.com/rust-lang/rust/issues/33685
4242 [36868]: https://github.com/rust-lang/rust/pull/36868
4243 [37127]: https://github.com/rust-lang/rust/pull/37127
4244 [37229]: https://github.com/rust-lang/rust/pull/37229
4245 [37456]: https://github.com/rust-lang/rust/pull/37456
4246 [37527]: https://github.com/rust-lang/rust/pull/37527
4247 [37602]: https://github.com/rust-lang/rust/pull/37602
4248 [37613]: https://github.com/rust-lang/rust/pull/37613
4249 [37615]: https://github.com/rust-lang/rust/pull/37615
4250 [37636]: https://github.com/rust-lang/rust/pull/37636
4251 [37627]: https://github.com/rust-lang/rust/pull/37627
4252 [37642]: https://github.com/rust-lang/rust/pull/37642
4253 [37677]: https://github.com/rust-lang/rust/pull/37677
4254 [37699]: https://github.com/rust-lang/rust/pull/37699
4255 [37701]: https://github.com/rust-lang/rust/pull/37701
4256 [37705]: https://github.com/rust-lang/rust/pull/37705
4257 [37749]: https://github.com/rust-lang/rust/pull/37749
4258 [37760]: https://github.com/rust-lang/rust/pull/37760
4259 [37763]: https://github.com/rust-lang/rust/pull/37763
4260 [37764]: https://github.com/rust-lang/rust/pull/37764
4261 [37789]: https://github.com/rust-lang/rust/pull/37789
4262 [37791]: https://github.com/rust-lang/rust/pull/37791
4263 [37814]: https://github.com/rust-lang/rust/pull/37814
4264 [37817]: https://github.com/rust-lang/rust/pull/37817
4265 [37834]: https://github.com/rust-lang/rust/pull/37834
4266 [37848]: https://github.com/rust-lang/rust/pull/37848
4267 [37855]: https://github.com/rust-lang/rust/pull/37855
4268 [37882]: https://github.com/rust-lang/rust/pull/37882
4269 [37888]: https://github.com/rust-lang/rust/pull/37888
4270 [37973]: https://github.com/rust-lang/rust/pull/37973
4271 [37979]: https://github.com/rust-lang/rust/pull/37979
4272 [38086]: https://github.com/rust-lang/rust/pull/38086
4273 [38107]: https://github.com/rust-lang/rust/pull/38107
4274 [38117]: https://github.com/rust-lang/rust/pull/38117
4275 [38134]: https://github.com/rust-lang/rust/pull/38134
4276 [38146]: https://github.com/rust-lang/rust/pull/38146
4277 [38181]: https://github.com/rust-lang/rust/pull/38181
4278 [38182]: https://github.com/rust-lang/rust/pull/38182
4279 [38185]: https://github.com/rust-lang/rust/pull/38185
4280 [38192]: https://github.com/rust-lang/rust/pull/38192
4281 [38279]: https://github.com/rust-lang/rust/pull/38279
4282 [38835]: https://github.com/rust-lang/rust/pull/38835
4283 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4284 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4285 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4286 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4287 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4288 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4289 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4290 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4291 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4292 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4293 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4294 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4295 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4296 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4297 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4298 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4299 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4300 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4301 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4302 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4303 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4304 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4305 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4306 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4307 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4308 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4309 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4310 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4311 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4312 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4313 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4314 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4315 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4316 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4317 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4318 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4319 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4320 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4323 Version 1.14.0 (2016-12-22)
4324 ===========================
4329 * [`..` matches multiple tuple fields in enum variants, structs
4330 and tuples][36843]. [RFC 1492].
4331 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4332 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4333 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4334 dereferencing][36822]
4339 * [Mark enums with non-zero discriminant as non-zero][37224]
4340 * [Lower-case `static mut` names are linted like other
4341 statics and consts][37162]
4342 * [Fix ICE on some macros in const integer positions
4343 (e.g. `[u8; m!()]`)][36819]
4344 * [Improve error message and snippet for "did you mean `x`"][36798]
4345 * [Add a panic-strategy field to the target specification][36794]
4346 * [Include LLVM version in `--version --verbose`][37200]
4348 Compile-time Optimizations
4349 --------------------------
4351 * [Improve macro expansion performance][37569]
4352 * [Shrink `Expr_::ExprInlineAsm`][37445]
4353 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4354 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4355 * [Avoid more allocations when compiling html5ever][37373]
4356 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4357 * [Avoid some allocations in the macro parser][37318]
4358 * [Use a faster deflate setting][37298]
4359 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4360 during interning of slices][37270]
4361 * [Optimize `write_metadata`][37267]
4362 * [Don't process obligation forest cycles when stalled][37231]
4363 * [Avoid many `CrateConfig` clones][37161]
4364 * [Optimize `Substs::super_fold_with`][37108]
4365 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4366 * [Speed up `plug_leaks`][36917]
4371 * [`println!()`, with no arguments, prints newline][36825].
4372 Previously, an empty string was required to achieve the same.
4373 * [`Wrapping` impls standard binary and unary operators, as well as
4374 the `Sum` and `Product` iterators][37356]
4375 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4377 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4378 `VecDeque` iterators][37315]
4379 * [Improve `SipHasher` performance on small values][37312]
4380 * [Add Iterator trait TrustedLen to enable better FromIterator /
4382 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4383 * [`ReadDir` implements `Debug`][37221]
4384 * [Implement `RefUnwindSafe` for atomic types][37178]
4385 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4386 * [Avoid allocations in `Decoder::read_str`][37064]
4387 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4388 * [Impl `Debug` for raw pointers to unsized data][36880]
4389 * [Don't reuse `HashMap` random seeds][37470]
4390 * [The internal memory layout of `HashMap` is more cache-friendly, for
4391 significant improvements in some operations][36692]
4392 * [`HashMap` uses less memory on 32-bit architectures][36595]
4393 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4398 * [Expose rustc cfg values to build scripts][cargo/3243]
4399 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4400 * [Fix passing --features when testing multiple packages][cargo/3280]
4401 * [Use a single profile set per workspace][cargo/3249]
4402 * [Load `replace` sections from lock files][cargo/3220]
4403 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4408 * [rustup is the recommended Rust installation method][1.14rustup]
4409 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4410 S390x. These are [tier 2] platforms and may have major defects. Follow the
4411 instructions on the website to install, or add the targets to an existing
4412 installation with `rustup target add`. The new target triples are:
4413 - `mips-unknown-linux-gnu`
4414 - `mipsel-unknown-linux-gnu`
4415 - `mips64-unknown-linux-gnuabi64`
4416 - `mips64el-unknown-linux-gnuabi64 `
4417 - `powerpc-unknown-linux-gnu`
4418 - `powerpc64-unknown-linux-gnu`
4419 - `powerpc64le-unknown-linux-gnu`
4420 - `s390x-unknown-linux-gnu `
4421 * This release includes target (std) builds for ARM Linux running MUSL
4422 libc. These are [tier 2] platforms and may have major defects. Add the
4423 following triples to an existing rustup installation with `rustup target add`:
4424 - `arm-unknown-linux-musleabi`
4425 - `arm-unknown-linux-musleabihf`
4426 - `armv7-unknown-linux-musleabihf`
4427 * This release includes [experimental support for WebAssembly][1.14wasm], via
4428 the `wasm32-unknown-emscripten` target. This target is known to have major
4429 defects. Please test, report, and fix.
4430 * rustup no longer installs documentation by default. Run `rustup
4431 component add rust-docs` to install.
4432 * [Fix line stepping in debugger][37310]
4433 * [Enable line number debuginfo in releases][37280]
4438 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4439 * [Add support for Fuchsia OS][37313]
4440 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4445 * [A number of forward-compatibility lints used by the compiler
4446 to gradually introduce language changes have been converted
4447 to deny by default][36894]:
4448 - ["use of inaccessible extern crate erroneously allowed"][36886]
4449 - ["type parameter default erroneously allowed in invalid location"][36887]
4450 - ["detects super or self keywords at the beginning of global path"][36888]
4451 - ["two overlapping inherent impls define an item with the same name
4452 were erroneously allowed"][36889]
4453 - ["floating-point constants cannot be used in patterns"][36890]
4454 - ["constants of struct or enum type can only be used in a pattern if
4455 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4456 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4457 * [Prohibit patterns in trait methods without bodies][37378]
4458 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4459 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4460 * [The `$crate` macro variable is accepted in fewer locations][37213]
4461 * [Impls specifying extra region requirements beyond the trait
4462 they implement are rejected][37167]
4463 * [Enums may not be unsized][37111]. Unsized enums are intended to
4464 work but never have. For now they are forbidden.
4465 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4467 [tier 2]: https://forge.rust-lang.org/platform-support.html
4468 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4469 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4470 [36430]: https://github.com/rust-lang/rust/pull/36430
4471 [36595]: https://github.com/rust-lang/rust/pull/36595
4472 [36595]: https://github.com/rust-lang/rust/pull/36595
4473 [36692]: https://github.com/rust-lang/rust/pull/36692
4474 [36767]: https://github.com/rust-lang/rust/pull/36767
4475 [36794]: https://github.com/rust-lang/rust/pull/36794
4476 [36798]: https://github.com/rust-lang/rust/pull/36798
4477 [36819]: https://github.com/rust-lang/rust/pull/36819
4478 [36822]: https://github.com/rust-lang/rust/pull/36822
4479 [36825]: https://github.com/rust-lang/rust/pull/36825
4480 [36843]: https://github.com/rust-lang/rust/pull/36843
4481 [36880]: https://github.com/rust-lang/rust/pull/36880
4482 [36886]: https://github.com/rust-lang/rust/issues/36886
4483 [36887]: https://github.com/rust-lang/rust/issues/36887
4484 [36888]: https://github.com/rust-lang/rust/issues/36888
4485 [36889]: https://github.com/rust-lang/rust/issues/36889
4486 [36890]: https://github.com/rust-lang/rust/issues/36890
4487 [36891]: https://github.com/rust-lang/rust/issues/36891
4488 [36892]: https://github.com/rust-lang/rust/issues/36892
4489 [36894]: https://github.com/rust-lang/rust/pull/36894
4490 [36917]: https://github.com/rust-lang/rust/pull/36917
4491 [36993]: https://github.com/rust-lang/rust/pull/36993
4492 [37037]: https://github.com/rust-lang/rust/pull/37037
4493 [37064]: https://github.com/rust-lang/rust/pull/37064
4494 [37094]: https://github.com/rust-lang/rust/pull/37094
4495 [37108]: https://github.com/rust-lang/rust/pull/37108
4496 [37111]: https://github.com/rust-lang/rust/pull/37111
4497 [37161]: https://github.com/rust-lang/rust/pull/37161
4498 [37162]: https://github.com/rust-lang/rust/pull/37162
4499 [37167]: https://github.com/rust-lang/rust/pull/37167
4500 [37178]: https://github.com/rust-lang/rust/pull/37178
4501 [37200]: https://github.com/rust-lang/rust/pull/37200
4502 [37213]: https://github.com/rust-lang/rust/pull/37213
4503 [37221]: https://github.com/rust-lang/rust/pull/37221
4504 [37224]: https://github.com/rust-lang/rust/pull/37224
4505 [37230]: https://github.com/rust-lang/rust/pull/37230
4506 [37231]: https://github.com/rust-lang/rust/pull/37231
4507 [37247]: https://github.com/rust-lang/rust/pull/37247
4508 [37267]: https://github.com/rust-lang/rust/pull/37267
4509 [37270]: https://github.com/rust-lang/rust/pull/37270
4510 [37273]: https://github.com/rust-lang/rust/pull/37273
4511 [37280]: https://github.com/rust-lang/rust/pull/37280
4512 [37298]: https://github.com/rust-lang/rust/pull/37298
4513 [37306]: https://github.com/rust-lang/rust/pull/37306
4514 [37310]: https://github.com/rust-lang/rust/pull/37310
4515 [37312]: https://github.com/rust-lang/rust/pull/37312
4516 [37313]: https://github.com/rust-lang/rust/pull/37313
4517 [37315]: https://github.com/rust-lang/rust/pull/37315
4518 [37318]: https://github.com/rust-lang/rust/pull/37318
4519 [37322]: https://github.com/rust-lang/rust/pull/37322
4520 [37326]: https://github.com/rust-lang/rust/pull/37326
4521 [37351]: https://github.com/rust-lang/rust/pull/37351
4522 [37356]: https://github.com/rust-lang/rust/pull/37356
4523 [37367]: https://github.com/rust-lang/rust/pull/37367
4524 [37373]: https://github.com/rust-lang/rust/pull/37373
4525 [37378]: https://github.com/rust-lang/rust/pull/37378
4526 [37389]: https://github.com/rust-lang/rust/pull/37389
4527 [37392]: https://github.com/rust-lang/rust/pull/37392
4528 [37427]: https://github.com/rust-lang/rust/pull/37427
4529 [37439]: https://github.com/rust-lang/rust/pull/37439
4530 [37445]: https://github.com/rust-lang/rust/pull/37445
4531 [37470]: https://github.com/rust-lang/rust/pull/37470
4532 [37569]: https://github.com/rust-lang/rust/pull/37569
4533 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4534 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4535 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4536 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4537 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4538 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4539 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4542 Version 1.13.0 (2016-11-10)
4543 ===========================
4548 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4549 errors, like the `try!` macro, described in [RFC 0243].
4550 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4551 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4552 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4553 * [Fix lifetime rules for 'if' conditions][36029]
4554 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4559 * [Add the `-C link-arg` argument][36574]
4560 * [Remove the old AST-based backend from rustc_trans][35764]
4561 * [Don't enable NEON by default on armv7 Linux][35814]
4562 * [Fix debug line number info for macro expansions][35238]
4563 * [Do not emit "class method" debuginfo for types that are not
4564 DICompositeType][36008]
4565 * [Warn about multiple conflicting #[repr] hints][34623]
4566 * [When sizing DST, don't double-count nested struct prefixes][36351]
4567 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4568 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4569 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4570 * [Expand macros without recursing to avoid stack overflows][36214]
4575 * [Replace macro backtraces with labeled local uses][35702]
4576 * [Improve error message for misplaced doc comments][33922]
4577 * [Buffer unix and lock windows to prevent message interleaving][35975]
4578 * [Update lifetime errors to specifically note temporaries][36171]
4579 * [Special case a few colors for Windows][36178]
4580 * [Suggest `use self` when such an import resolves][36289]
4581 * [Be more specific when type parameter shadows primitive type][36338]
4582 * Many minor improvements
4584 Compile-time Optimizations
4585 --------------------------
4587 * [Compute and cache HIR hashes at beginning][35854]
4588 * [Don't hash types in loan paths][36004]
4589 * [Cache projections in trans][35761]
4590 * [Optimize the parser's last token handling][36527]
4591 * [Only instantiate #[inline] functions in codegen units referencing
4592 them][36524]. This leads to big improvements in cases where crates export
4593 define many inline functions without using them directly.
4594 * [Lazily allocate TypedArena's first chunk][36592]
4595 * [Don't allocate during default HashSet creation][36734]
4602 * [`overflowing_abs`]
4603 * [`RefCell::try_borrow`]
4604 * [`RefCell::try_borrow_mut`]
4609 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4610 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4612 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4613 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4614 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4615 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4616 * [Use arc4rand on FreeBSD][35884]
4617 * [memrchr: Correct aligned offset computation][35969]
4618 * [Improve Demangling of Rust Symbols][36059]
4619 * [Use monotonic time in condition variables][35048]
4620 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4621 * [Implement conversion traits for `char`][35755]
4622 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4623 * [Zero first byte of CString on drop][36264]
4624 * [Inherit overflow checks for sum and product][36372]
4625 * [Add missing Eq implementations][36423]
4626 * [Implement `Debug` for `DirEntry`][36631]
4627 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4629 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4630 * [Implement more traits for `std::io::ErrorKind`][35911]
4631 * [Optimize BinaryHeap bounds checking][36072]
4632 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4633 `extend_with_element`][36355]
4634 * [Fix overflow checking in unsigned pow()][34942]
4639 * This release includes security fixes to both curl and OpenSSL.
4640 * [Fix transitive doctests when panic=abort][cargo/3021]
4641 * [Add --all-features flag to cargo][cargo/3038]
4642 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4643 * [Don't parse the home directory more than once][cargo/3078]
4644 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4645 * [Update OpenSSL to 1.0.2j][cargo/3121]
4646 * [Add license and license_file to cargo metadata output][cargo/3110]
4647 * [Make crates-io registry URL optional in config; ignore all changes to
4648 source.crates-io][cargo/3089]
4649 * [Don't download dependencies from other platforms][cargo/3123]
4650 * [Build transitive dev-dependencies when needed][cargo/3125]
4651 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4652 * [Avoid updating registry when adding existing deps][cargo/3144]
4653 * [Warn about path overrides that won't work][cargo/3136]
4654 * [Use workspaces during `cargo install`][cargo/3146]
4655 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4656 * [Add --message-format flag][cargo/3000]
4657 * [Pass target environment for rustdoc][cargo/3205]
4658 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4659 * [Update curl and curl-sys][cargo/3241]
4660 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4665 * [rustdoc: Add the `--sysroot` argument][36586]
4666 * [rustdoc: Fix a couple of issues with the search results][35655]
4667 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4668 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4669 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4674 * [Remove unmaintained style guide][35124]
4675 * [Add s390x support][36369]
4676 * [Initial work at Haiku OS support][36727]
4677 * [Add mips-uclibc targets][35734]
4678 * [Crate-ify compiler-rt into compiler-builtins][35021]
4679 * [Add rustc version info (git hash + date) to dist tarball][36213]
4680 * Many documentation improvements
4685 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4686 * [Deny (by default) transmuting from fn item types to pointer-sized
4687 types][34923]. Continuing the long transition to zero-sized fn items,
4689 * [Fix `#[derive]` for empty tuple structs/variants][35728].
4691 * [Issue deprecation warnings for safe accesses to extern statics][36173]
4692 * [Fix lifetime rules for 'if' conditions][36029].
4693 * [Inherit overflow checks for sum and product][36372].
4694 * [Forbid user-defined macros named "macro_rules"][36730].
4696 [33922]: https://github.com/rust-lang/rust/pull/33922
4697 [34623]: https://github.com/rust-lang/rust/pull/34623
4698 [34923]: https://github.com/rust-lang/rust/pull/34923
4699 [34942]: https://github.com/rust-lang/rust/pull/34942
4700 [34982]: https://github.com/rust-lang/rust/pull/34982
4701 [35021]: https://github.com/rust-lang/rust/pull/35021
4702 [35048]: https://github.com/rust-lang/rust/pull/35048
4703 [35074]: https://github.com/rust-lang/rust/pull/35074
4704 [35124]: https://github.com/rust-lang/rust/pull/35124
4705 [35234]: https://github.com/rust-lang/rust/pull/35234
4706 [35238]: https://github.com/rust-lang/rust/pull/35238
4707 [35354]: https://github.com/rust-lang/rust/pull/35354
4708 [35559]: https://github.com/rust-lang/rust/pull/35559
4709 [35585]: https://github.com/rust-lang/rust/pull/35585
4710 [35627]: https://github.com/rust-lang/rust/pull/35627
4711 [35655]: https://github.com/rust-lang/rust/pull/35655
4712 [35702]: https://github.com/rust-lang/rust/pull/35702
4713 [35707]: https://github.com/rust-lang/rust/pull/35707
4714 [35728]: https://github.com/rust-lang/rust/pull/35728
4715 [35734]: https://github.com/rust-lang/rust/pull/35734
4716 [35755]: https://github.com/rust-lang/rust/pull/35755
4717 [35761]: https://github.com/rust-lang/rust/pull/35761
4718 [35764]: https://github.com/rust-lang/rust/pull/35764
4719 [35814]: https://github.com/rust-lang/rust/pull/35814
4720 [35854]: https://github.com/rust-lang/rust/pull/35854
4721 [35871]: https://github.com/rust-lang/rust/pull/35871
4722 [35884]: https://github.com/rust-lang/rust/pull/35884
4723 [35911]: https://github.com/rust-lang/rust/pull/35911
4724 [35969]: https://github.com/rust-lang/rust/pull/35969
4725 [35975]: https://github.com/rust-lang/rust/pull/35975
4726 [36004]: https://github.com/rust-lang/rust/pull/36004
4727 [36008]: https://github.com/rust-lang/rust/pull/36008
4728 [36014]: https://github.com/rust-lang/rust/pull/36014
4729 [36029]: https://github.com/rust-lang/rust/pull/36029
4730 [36059]: https://github.com/rust-lang/rust/pull/36059
4731 [36072]: https://github.com/rust-lang/rust/pull/36072
4732 [36101]: https://github.com/rust-lang/rust/pull/36101
4733 [36104]: https://github.com/rust-lang/rust/pull/36104
4734 [36171]: https://github.com/rust-lang/rust/pull/36171
4735 [36173]: https://github.com/rust-lang/rust/pull/36173
4736 [36178]: https://github.com/rust-lang/rust/pull/36178
4737 [36213]: https://github.com/rust-lang/rust/pull/36213
4738 [36214]: https://github.com/rust-lang/rust/pull/36214
4739 [36264]: https://github.com/rust-lang/rust/pull/36264
4740 [36266]: https://github.com/rust-lang/rust/pull/36266
4741 [36289]: https://github.com/rust-lang/rust/pull/36289
4742 [36338]: https://github.com/rust-lang/rust/pull/36338
4743 [36351]: https://github.com/rust-lang/rust/pull/36351
4744 [36355]: https://github.com/rust-lang/rust/pull/36355
4745 [36369]: https://github.com/rust-lang/rust/pull/36369
4746 [36372]: https://github.com/rust-lang/rust/pull/36372
4747 [36423]: https://github.com/rust-lang/rust/pull/36423
4748 [36482]: https://github.com/rust-lang/rust/pull/36482
4749 [36505]: https://github.com/rust-lang/rust/pull/36505
4750 [36524]: https://github.com/rust-lang/rust/pull/36524
4751 [36527]: https://github.com/rust-lang/rust/pull/36527
4752 [36551]: https://github.com/rust-lang/rust/pull/36551
4753 [36574]: https://github.com/rust-lang/rust/pull/36574
4754 [36586]: https://github.com/rust-lang/rust/pull/36586
4755 [36592]: https://github.com/rust-lang/rust/pull/36592
4756 [36631]: https://github.com/rust-lang/rust/pull/36631
4757 [36639]: https://github.com/rust-lang/rust/pull/36639
4758 [36721]: https://github.com/rust-lang/rust/pull/36721
4759 [36727]: https://github.com/rust-lang/rust/pull/36727
4760 [36730]: https://github.com/rust-lang/rust/pull/36730
4761 [36734]: https://github.com/rust-lang/rust/pull/36734
4762 [36754]: https://github.com/rust-lang/rust/pull/36754
4763 [36995]: https://github.com/rust-lang/rust/pull/36995
4764 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4765 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4766 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4767 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4768 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4769 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4770 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4771 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4772 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4773 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4774 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4775 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4776 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4777 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4778 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4779 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4780 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4781 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4782 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4783 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4784 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4785 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4786 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4787 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4788 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4789 [rustup]: https://www.rustup.rs
4790 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4791 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4792 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4793 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4794 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4795 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4796 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4799 Version 1.12.1 (2016-10-20)
4800 ===========================
4805 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4806 * [Confusion with double negation and booleans][36856]
4807 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4808 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4809 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4810 * [Corrupted memory after updated to 1.12][36936]
4811 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4812 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4813 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4815 [36381]: https://github.com/rust-lang/rust/issues/36381
4816 [36856]: https://github.com/rust-lang/rust/issues/36856
4817 [36875]: https://github.com/rust-lang/rust/issues/36875
4818 [36924]: https://github.com/rust-lang/rust/issues/36924
4819 [36926]: https://github.com/rust-lang/rust/issues/36926
4820 [36936]: https://github.com/rust-lang/rust/issues/36936
4821 [37026]: https://github.com/rust-lang/rust/issues/37026
4822 [37112]: https://github.com/rust-lang/rust/issues/37112
4823 [37153]: https://github.com/rust-lang/rust/issues/37153
4826 Version 1.12.0 (2016-09-29)
4827 ===========================
4832 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4833 This translation pass is far simpler than the previous AST->LLVM pass, and
4834 creates opportunities to perform new optimizations directly on the MIR. It
4835 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4836 * [`rustc` presents a new, more readable error format, along with
4837 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4838 Most common editors supporting Rust have been updated to work with it. It was
4839 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4844 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4845 This translation pass is far simpler than the previous AST->LLVM pass, and
4846 creates opportunities to perform new optimizations directly on the MIR. It
4847 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4848 * [Print the Rust target name, not the LLVM target name, with
4849 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
4850 * [The computation of `TypeId` is correct in some cases where it was previously
4851 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
4852 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
4853 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
4854 `--print relocation-models`, and `--print code-models` print the available
4855 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
4856 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
4857 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
4858 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
4859 These targets produce statically-linked binaries. There are no binary release
4865 * [`rustc` presents a new, more readable error format, along with
4866 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4867 Most common editors supporting Rust have been updated to work with it. It was
4868 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4869 * [In error descriptions, references are now described in plain English,
4870 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
4871 * [In error type descriptions, unknown numeric types are named `{integer}` or
4872 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
4873 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
4878 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
4879 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
4880 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
4881 useful](https://github.com/rust-lang/rust/pull/34908)
4882 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
4883 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
4884 * [Semicolons are properly required as statement delimiters inside
4885 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
4886 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4891 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
4892 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
4893 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
4894 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
4895 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
4896 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
4897 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
4898 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
4899 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
4900 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
4901 Both on Unix and Windows.
4902 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
4903 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
4904 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
4905 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
4906 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
4907 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
4908 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
4909 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
4914 * [The `format!` macro and friends now allow a single argument to be formatted
4915 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
4916 * [The lifetime bounds on `[T]::binary_search_by` and
4917 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
4918 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
4919 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
4920 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
4921 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
4922 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
4923 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
4924 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
4925 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
4926 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
4927 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
4928 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
4929 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
4930 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
4931 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
4932 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
4933 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
4934 * [`mpsc::sync_channel` `Receiver`s return any available message before
4935 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
4936 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
4937 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
4942 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
4943 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
4944 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
4945 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
4946 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
4947 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
4948 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
4949 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
4950 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
4951 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
4952 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
4953 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
4954 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
4955 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
4956 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
4957 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
4962 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
4963 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
4968 * [Test binaries now support a `--test-threads` argument to specify the number
4969 of threads used to run tests, and which acts the same as the
4970 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
4971 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
4972 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
4973 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4974 * [Rust releases now come with source packages that can be installed by rustup
4975 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
4976 The resulting source code can be used by tools and IDES, located in the
4977 sysroot under `lib/rustlib/src`.
4982 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
4983 * Many minor improvements to the documentation.
4984 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
4989 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
4990 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
4991 * [When formatting strings, if "precision" is specified, the "fill",
4992 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
4993 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
4996 Version 1.11.0 (2016-08-18)
4997 ===========================
5002 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5003 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5004 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5005 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5010 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5011 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5012 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5013 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5014 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5015 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5016 (in libcore - previously stabilized in libstd)
5017 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5018 (in libcore - previously stabilized in libstd)
5019 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5020 (in libcore - previously stabilized in libstd)
5021 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5022 (in libcore - previously stabilized in libstd)
5023 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5024 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5025 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5026 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5031 * [The `thread_local!` macro supports multiple definitions in a single
5032 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5033 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5034 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5035 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5036 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5037 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5038 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5039 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5044 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5045 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5046 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5047 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5048 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5049 and `-vv` prints warnings for all crates.
5050 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5051 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5052 This provides room for expansion by arbitrary tools.
5053 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5054 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5055 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5056 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5057 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5058 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5059 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5064 * [Caching projections speeds up type check dramatically for some
5065 workloads](https://github.com/rust-lang/rust/pull/33816)
5066 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5067 This hasher is faster, but is believed to provide sufficient
5068 protection from collision attacks.
5069 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5074 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5075 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5076 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5077 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5078 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5083 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5084 * [When emitting debug info, rustc emits frame pointers for closures,
5085 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5086 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5087 * Many more errors have been given error codes and extended
5089 * API documentation continues to be improved, with many new examples
5094 * [rustc no longer hangs when dependencies recursively re-export
5095 submodules](https://github.com/rust-lang/rust/pull/34542)
5096 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5097 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5098 rewritten](https://github.com/rust-lang/rust/pull/33895)
5099 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5100 No targets use this yet, but it works toward AVR support.
5105 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5106 * [The new follow-set rules that place restrictions on `macro_rules!`
5107 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5108 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5109 and has been a warning since 1.10.
5110 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5111 This causes breakage in some corner cases.
5114 Version 1.10.0 (2016-07-07)
5115 ===========================
5120 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5121 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5122 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5123 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5124 * [`panic!` can be converted to a runtime abort with the
5125 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5126 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5127 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5128 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5129 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5130 Note that Cargo does not yet directly support cdylibs.
5135 * `os::windows::fs::OpenOptionsExt::access_mode`
5136 * `os::windows::fs::OpenOptionsExt::share_mode`
5137 * `os::windows::fs::OpenOptionsExt::custom_flags`
5138 * `os::windows::fs::OpenOptionsExt::attributes`
5139 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5140 * `os::unix::fs::OpenOptionsExt::custom_flags`
5141 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5142 * `Default for sync::Weak`
5143 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5144 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5145 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5146 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5147 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5148 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5149 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5150 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5151 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5152 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5153 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5154 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5155 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5156 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5157 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5158 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5159 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5160 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5161 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5162 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5163 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5164 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5165 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5166 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5167 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5168 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5169 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5170 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5171 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5172 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5173 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5174 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5175 * Read/Write/RawFd impls for `UnixStream`
5176 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5177 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5178 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5179 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5180 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5181 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5182 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5183 * RawFd impls for `UnixListener`
5184 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5185 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5186 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5187 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5188 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5189 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5190 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5191 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5192 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5193 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5194 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5195 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5196 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5197 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5198 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5199 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5200 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5201 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5202 * RawFd impls for `UnixDatagram`
5203 * `{BTree,Hash}Map::values_mut`
5204 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5209 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5210 The semantics of this minor method are subtle and probably not what
5212 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5213 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5214 will fall back to `/dev/urandom` temporarily to avoid blocking
5215 during early boot](https://github.com/rust-lang/rust/pull/33086).
5216 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5217 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5218 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5219 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5220 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5221 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5222 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5226 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5227 This controls the runtime behavior of the `panic!` macro
5228 and can be either "unwind" (the default), or "abort".
5229 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5230 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5231 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5232 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5233 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5234 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5235 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5236 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5237 By default they are retried twice, which can be customized with the
5238 `net.retry` value in `.cargo/config`.
5239 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5240 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5241 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5242 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5243 Makes it possible to install multiple crates in parallel.
5244 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5245 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5246 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5247 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5248 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5249 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5254 * [rustc memory usage was reduced by refactoring the context used for
5255 type checking](https://github.com/rust-lang/rust/pull/33425).
5256 * [Speed up creation of `HashMap`s by caching the random keys used
5257 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5258 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5259 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5260 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5261 10x faster than the previous lookup tables.
5262 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5267 * Many incremental improvements to documentation and rustdoc.
5268 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5269 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5270 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5271 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5272 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5273 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5274 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5279 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5280 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5281 * [`std` no longer prints backtraces on platforms where the running
5282 module must be loaded with `env::current_exe`, which can't be relied
5283 on](https://github.com/rust-lang/rust/pull/33554).
5284 * This release includes std binaries for the i586-unknown-linux-gnu,
5285 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5286 i586 target is for old x86 hardware without SSE2, and the armv7
5287 target is for Android running on modern ARM architectures.
5288 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5289 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5290 * [On Unix the runtime aborts by calling `libc::abort` instead of
5291 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5292 * [Rust is now bootstrapped from the previous release of Rust,
5293 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5298 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5299 * [`target_env` for Linux ARM targets is just `gnu`, not
5300 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5301 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5302 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5303 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5304 Affects how macros are parsed.
5305 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5306 * [Feature-gated attributes on macro-generated macro invocations are
5307 now rejected](https://github.com/rust-lang/rust/pull/32791).
5308 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5309 This caused some minor changes to type inference.
5312 Version 1.9.0 (2016-05-26)
5313 ==========================
5318 * The `#[deprecated]` attribute when applied to an API will generate
5319 warnings when used. The warnings may be suppressed with
5320 `#[allow(deprecated)]`. [RFC 1270].
5321 * [`fn` item types are zero sized, and each `fn` names a unique
5322 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5323 `transmute` on a `fn` type will generate a warning for a few cycles,
5324 then will be converted to an error.
5325 * [Field and method resolution understand visibility, so private
5326 fields and methods cannot prevent the proper use of public fields
5327 and methods][1.9fv].
5328 * [The parser considers unicode codepoints in the
5329 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5335 * [`std::panic::catch_unwind`] (renamed from `recover`)
5336 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5337 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5338 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5339 * [`str::is_char_boundary`]
5340 * [`<*const T>::as_ref`]
5341 * [`<*mut T>::as_ref`]
5342 * [`<*mut T>::as_mut`]
5343 * [`AsciiExt::make_ascii_uppercase`]
5344 * [`AsciiExt::make_ascii_lowercase`]
5345 * [`char::decode_utf16`]
5346 * [`char::DecodeUtf16`]
5347 * [`char::DecodeUtf16Error`]
5348 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5349 * [`BTreeSet::take`]
5350 * [`BTreeSet::replace`]
5353 * [`HashSet::replace`]
5355 * [`OsString::with_capacity`]
5356 * [`OsString::clear`]
5357 * [`OsString::capacity`]
5358 * [`OsString::reserve`]
5359 * [`OsString::reserve_exact`]
5360 * [`OsStr::is_empty`]
5362 * [`std::os::unix::thread`]
5365 * [`JoinHandleExt::as_pthread_t`]
5366 * [`JoinHandleExt::into_pthread_t`]
5367 * [`HashSet::hasher`]
5368 * [`HashMap::hasher`]
5369 * [`CommandExt::exec`]
5370 * [`File::try_clone`]
5371 * [`SocketAddr::set_ip`]
5372 * [`SocketAddr::set_port`]
5373 * [`SocketAddrV4::set_ip`]
5374 * [`SocketAddrV4::set_port`]
5375 * [`SocketAddrV6::set_ip`]
5376 * [`SocketAddrV6::set_port`]
5377 * [`SocketAddrV6::set_flowinfo`]
5378 * [`SocketAddrV6::set_scope_id`]
5379 * [`slice::copy_from_slice`]
5380 * [`ptr::read_volatile`]
5381 * [`ptr::write_volatile`]
5382 * [`OpenOptions::create_new`]
5383 * [`TcpStream::set_nodelay`]
5384 * [`TcpStream::nodelay`]
5385 * [`TcpStream::set_ttl`]
5386 * [`TcpStream::ttl`]
5387 * [`TcpStream::set_only_v6`]
5388 * [`TcpStream::only_v6`]
5389 * [`TcpStream::take_error`]
5390 * [`TcpStream::set_nonblocking`]
5391 * [`TcpListener::set_ttl`]
5392 * [`TcpListener::ttl`]
5393 * [`TcpListener::set_only_v6`]
5394 * [`TcpListener::only_v6`]
5395 * [`TcpListener::take_error`]
5396 * [`TcpListener::set_nonblocking`]
5397 * [`UdpSocket::set_broadcast`]
5398 * [`UdpSocket::broadcast`]
5399 * [`UdpSocket::set_multicast_loop_v4`]
5400 * [`UdpSocket::multicast_loop_v4`]
5401 * [`UdpSocket::set_multicast_ttl_v4`]
5402 * [`UdpSocket::multicast_ttl_v4`]
5403 * [`UdpSocket::set_multicast_loop_v6`]
5404 * [`UdpSocket::multicast_loop_v6`]
5405 * [`UdpSocket::set_multicast_ttl_v6`]
5406 * [`UdpSocket::multicast_ttl_v6`]
5407 * [`UdpSocket::set_ttl`]
5408 * [`UdpSocket::ttl`]
5409 * [`UdpSocket::set_only_v6`]
5410 * [`UdpSocket::only_v6`]
5411 * [`UdpSocket::join_multicast_v4`]
5412 * [`UdpSocket::join_multicast_v6`]
5413 * [`UdpSocket::leave_multicast_v4`]
5414 * [`UdpSocket::leave_multicast_v6`]
5415 * [`UdpSocket::take_error`]
5416 * [`UdpSocket::connect`]
5417 * [`UdpSocket::send`]
5418 * [`UdpSocket::recv`]
5419 * [`UdpSocket::set_nonblocking`]
5424 * [`std::sync::Once` is poisoned if its initialization function
5426 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5427 * [Most types implement `fmt::Debug`][1.9db].
5428 * [The default buffer size used by `BufReader` and `BufWriter` was
5429 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5430 used by other languages.
5431 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5432 `Duration` additionally implements `*=` and `/=`][1.9ta].
5433 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5434 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5435 * [`Chain` implements `BufRead`][1.9ch].
5436 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5441 * [Cargo can now run concurrently][1.9cc].
5442 * [Top-level overrides allow specific revisions of crates to be
5443 overridden through the entire crate graph][1.9ct]. This is intended
5444 to make upgrades easier for large projects, by allowing crates to be
5445 forked temporarily until they've been upgraded and republished.
5446 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5447 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5448 on the commandline][1.9cf]. `rustc` arguments can also be specified
5449 in the `build.rustflags` configuration key.
5454 * [The time complexity of comparing variables for equivalence during type
5455 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5456 to major compilation time improvement in some scenarios.
5457 * [`ToString` is specialized for `str`, giving it the same performance
5458 as `to_owned`][1.9ts].
5459 * [Spawning processes with `Command::output` no longer creates extra
5461 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5462 for C-like enums][1.9cl].
5467 * [Passing the `--quiet` flag to a test runner will produce
5468 much-abbreviated output][1.9q].
5469 * The Rust Project now publishes std binaries for the
5470 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5471 `i586-pc-windows-msvc` targets.
5476 * [`std::sync::Once` is poisoned if its initialization function
5478 * [It is illegal to define methods with the same name in overlapping
5479 inherent `impl` blocks][1.9sn].
5480 * [`fn` item types are zero sized, and each `fn` names a unique
5481 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5482 `transmute` on a `fn` type will generate a warning for a few cycles,
5483 then will be converted to an error.
5484 * [Improvements to const evaluation may trigger new errors when integer
5485 literals are out of range][1.9ce].
5488 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5489 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5490 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5491 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5492 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5493 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5494 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5495 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5496 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5497 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5498 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5499 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5500 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5501 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5502 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5503 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5504 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5505 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5506 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5507 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5508 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5509 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5510 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5511 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5512 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5513 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5514 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5515 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5516 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5517 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5518 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5519 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5520 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5521 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5522 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5523 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5524 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5525 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5526 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5527 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5528 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5529 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5530 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5531 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5532 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5533 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5534 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5535 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5536 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5537 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5538 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5539 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5540 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5541 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5542 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5543 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5544 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5545 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5546 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5547 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5548 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5549 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5550 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5551 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5552 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5553 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5554 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5555 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5556 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5557 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5558 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5559 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5560 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5561 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5562 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5563 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5564 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5565 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5566 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5567 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5568 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5569 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5570 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5571 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5572 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5573 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5574 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5575 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5576 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5577 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5578 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5579 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5580 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5581 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5582 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5583 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5584 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5585 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5586 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5587 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5588 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5589 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5590 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5591 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5592 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5593 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5594 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5595 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5596 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5597 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5600 Version 1.8.0 (2016-04-14)
5601 ==========================
5606 * Rust supports overloading of compound assignment statements like
5607 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5608 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5609 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5611 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5612 addition to the non-braced form, `struct Foo;`. [RFC 218].
5618 * [`str::encode_utf16`] (renamed from `utf16_units`)
5619 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5622 * [`ptr::drop_in_place`]
5624 * [`time::SystemTime`]
5626 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5627 * [`Instant::elapsed`]
5628 * [`SystemTime::now`]
5629 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5630 * [`SystemTime::elapsed`]
5631 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5632 * [`SystemTimeError`]
5633 * [`SystemTimeError::duration`]
5634 * Various impls for `SystemTimeError`
5636 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5637 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5638 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5639 * [The `write!` and `writeln!` macros correctly emit errors if any of
5640 their arguments can't be formatted][1.8w].
5641 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5642 * [The Unix-specific `raw` modules, which contain a number of
5643 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5644 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5645 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5646 across platforms was making it difficult to implement `std`
5647 correctly. Those that need these definitions should use the `libc`
5649 * The Unix-specific `MetadataExt` traits, including
5650 `os::unix::fs::MetadataExt`, which expose values such as inode
5651 numbers [no longer return platform-specific types][1.8r], but
5652 instead return widened integers. [RFC 1415].
5653 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5654 * [Atomic loads and stores are not volatile][1.8a].
5655 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5660 * [Inlining hash functions lead to a 3% compile-time improvement in
5661 some workloads][1.8h].
5662 * When using jemalloc, its symbols are [unprefixed so that it
5663 overrides the libc malloc implementation][1.8h]. This means that for
5664 rustc, LLVM is now using jemalloc, which results in a 6%
5665 compile-time improvement on a specific workload.
5666 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5671 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5672 i686-pc-windows-msvc is now considered a tier-1 platform.
5673 * [The `--print targets` flag prints a list of supported targets][1.8t].
5674 * [The `--print cfg` flag prints the `cfg`s defined for the current
5676 * [`rustc` can be built with an new Cargo-based build system, written
5677 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
5678 build system. To enable it configure with `configure --rustbuild`.
5679 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
5680 variants while also indicating the total number of missing variants
5681 if more than 3][1.8m].
5682 * [Executable stacks are disabled on Linux and BSD][1.8nx].
5683 * The Rust Project now publishes binary releases of the standard
5684 library for a number of tier-2 targets:
5685 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
5686 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
5687 `x86_64-rumprun-netbsd`. These can be installed with
5688 tools such as [multirust][1.8mr].
5693 * [`cargo init` creates a new Cargo project in the current
5694 directory][1.8ci]. It is otherwise like `cargo new`.
5695 * [Cargo has configuration keys for `-v` and
5696 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
5697 `[term]` section of `.cargo/config`.
5698 * [Configuration keys that evaluate to strings or integers can be set
5699 via environment variables][1.8ce]. For example the `build.jobs` key
5700 can be set via `CARGO_BUILD_JOBS`. Environment variables take
5701 precedence over config files.
5702 * [Target-specific dependencies support Rust `cfg` syntax for
5703 describing targets][1.8cfg] so that dependencies for multiple
5704 targets can be specified together. [RFC 1361].
5705 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
5706 `RUSTDOC` take precedence over the `build.target-dir`,
5707 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
5708 * [The child process tree is killed on Windows when Cargo is
5710 * [The `build.target` configuration value sets the target platform,
5711 like `--target`][1.8ct].
5716 * [Unstable compiler flags have been further restricted][1.8u]. Since
5717 1.0 `-Z` flags have been considered unstable, and other flags that
5718 were considered unstable additionally required passing `-Z
5719 unstable-options` to access. Unlike unstable language and library
5720 features though, these options have been accessible on the stable
5721 release channel. Going forward, *new unstable flags will not be
5722 available on the stable release channel*, and old unstable flags
5723 will warn about their usage. In the future, all unstable flags will
5724 be unavailable on the stable release channel.
5725 * [It is no longer possible to `match` on empty enum variants using
5726 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
5727 * The Unix-specific `MetadataExt` traits, including
5728 `os::unix::fs::MetadataExt`, which expose values such as inode
5729 numbers [no longer return platform-specific types][1.8r], but
5730 instead return widened integers. [RFC 1415].
5731 * [Modules sourced from the filesystem cannot appear within arbitrary
5732 blocks, but only within other modules][1.8mf].
5733 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
5734 * On Unix, [stack overflow triggers a runtime abort instead of a
5736 * [`Command::spawn` and its equivalents return an error if any of
5737 its command-line arguments contain interior `NUL`s][1.8n].
5738 * [Tuple and unit enum variants from other crates are in the type
5740 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
5741 type instead of `.a` files][1.8st]. Additionally, for the MSVC
5742 toolchain, `rustc` emits import libraries named `foo.dll.lib`
5743 instead of `foo.lib`.
5746 [1.8a]: https://github.com/rust-lang/rust/pull/30962
5747 [1.8b]: https://github.com/rust-lang/rust/pull/31123
5748 [1.8c]: https://github.com/rust-lang/rust/pull/31530
5749 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
5750 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
5751 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5752 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5753 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5754 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5755 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5756 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5757 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5758 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5759 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5760 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5761 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5762 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5763 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5764 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5765 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5766 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5767 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5768 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5769 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5770 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5771 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5772 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5773 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5774 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5775 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5776 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5777 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5778 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5779 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5780 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5781 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5782 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5783 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5784 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5785 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5786 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5787 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5788 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5789 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5790 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5791 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5792 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5793 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5794 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5795 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5796 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5797 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5798 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5799 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5800 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5801 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5802 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5803 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5804 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5805 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5808 Version 1.7.0 (2016-03-03)
5809 ==========================
5816 * [`Path::strip_prefix`] (renamed from relative_from)
5817 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
5819 * [`Ipv4Addr::is_loopback`]
5820 * [`Ipv4Addr::is_private`]
5821 * [`Ipv4Addr::is_link_local`]
5822 * [`Ipv4Addr::is_multicast`]
5823 * [`Ipv4Addr::is_broadcast`]
5824 * [`Ipv4Addr::is_documentation`]
5826 * [`Ipv6Addr::is_unspecified`]
5827 * [`Ipv6Addr::is_loopback`]
5828 * [`Ipv6Addr::is_multicast`]
5831 * [`Vec::as_mut_slice`]
5833 * [`String::as_str`]
5834 * [`String::as_mut_str`]
5836 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5838 * `<[T]>::`[`sort_by_key`]
5839 * checked, saturated, and overflowing operations
5840 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
5841 * [`i32::saturating_mul`]
5842 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
5843 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
5844 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
5845 * [`u32::saturating_mul`]
5846 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
5847 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
5848 * and checked, saturated, and overflowing operations for other primitive types
5850 * [`ffi::IntoStringError`]
5851 * [`CString::into_string`]
5852 * [`CString::into_bytes`]
5853 * [`CString::into_bytes_with_nul`]
5854 * `From<CString> for Vec<u8>`
5856 * [`IntoStringError::into_cstring`]
5857 * [`IntoStringError::utf8_error`]
5858 * `Error for IntoStringError`
5860 * [`std::hash::BuildHasher`]
5861 * [`BuildHasher::Hasher`]
5862 * [`BuildHasher::build_hasher`]
5863 * [`std::hash::BuildHasherDefault`]
5864 * [`HashMap::with_hasher`]
5865 * [`HashMap::with_capacity_and_hasher`]
5866 * [`HashSet::with_hasher`]
5867 * [`HashSet::with_capacity_and_hasher`]
5868 * [`std::collections::hash_map::RandomState`]
5869 * [`RandomState::new`]
5870 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
5871 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
5872 from bytes is faster.
5873 * [The performance of `LineWriter` (and thus `io::stdout`) was
5874 improved by using `memchr` to search for newlines][1.7m].
5875 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
5876 `f64` variants were stabilized previously.
5877 * [`BTreeMap` was rewritten to use less memory and improve the performance
5878 of insertion and iteration, the latter by as much as 5x][1.7bm].
5879 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
5880 covariant over their contained type][1.7bt].
5881 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
5882 over their contained type][1.7ll].
5883 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
5885 * [`Any` is implemented for unsized types][1.7a].
5886 * [`Hash` is implemented for `Duration`][1.7h].
5891 * [When running tests with `--test`, rustdoc will pass `--cfg`
5892 arguments to the compiler][1.7dt].
5893 * [The compiler is built with RPATH information by default][1.7rpa].
5894 This means that it will be possible to run `rustc` when installed in
5895 unusual configurations without configuring the dynamic linker search
5897 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
5898 any RPATH entries (emitted with `-C rpath`) *not* take precedence
5899 over `LD_LIBRARY_PATH`.
5904 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
5905 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
5906 * [The `rerun-if-changed` build script directive no longer causes the
5907 build script to incorrectly run twice in certain scenarios][1.7rr].
5912 * Soundness fixes to the interactions between associated types and
5913 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
5914 code that violates the new rules. This is a significant change that
5915 is known to break existing code, so it has emitted warnings for the
5916 new error cases since 1.4 to give crate authors time to adapt. The
5917 details of what is changing are subtle; read the RFC for more.
5918 * [Several bugs in the compiler's visibility calculations were
5919 fixed][1.7v]. Since this was found to break significant amounts of
5920 code, the new errors will be emitted as warnings for several release
5921 cycles, under the `private_in_public` lint.
5922 * Defaulted type parameters were accidentally accepted in positions
5923 that were not intended. In this release, [defaulted type parameters
5924 appearing outside of type definitions will generate a
5925 warning][1.7d], which will become an error in future releases.
5926 * [Parsing "." as a float results in an error instead of 0][1.7p].
5927 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
5928 * [Borrows of closure parameters may not outlive the closure][1.7bc].
5930 [1.7a]: https://github.com/rust-lang/rust/pull/30928
5931 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
5932 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
5933 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
5934 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
5935 [1.7d]: https://github.com/rust-lang/rust/pull/30724
5936 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
5937 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
5938 [1.7f]: https://github.com/rust-lang/rust/pull/30672
5939 [1.7h]: https://github.com/rust-lang/rust/pull/30818
5940 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
5941 [1.7m]: https://github.com/rust-lang/rust/pull/30381
5942 [1.7p]: https://github.com/rust-lang/rust/pull/30681
5943 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
5944 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
5945 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
5946 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
5947 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
5948 [1.7v]: https://github.com/rust-lang/rust/pull/29973
5949 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5950 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5951 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
5952 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
5953 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
5954 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
5955 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
5956 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
5957 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
5958 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
5959 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
5960 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
5961 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
5962 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
5963 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
5964 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
5965 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
5966 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
5967 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
5968 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
5969 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
5970 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
5971 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
5972 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
5973 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
5974 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
5975 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
5976 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
5977 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
5978 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
5979 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
5980 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
5981 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
5982 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
5983 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
5984 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
5985 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
5986 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
5987 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
5988 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
5989 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
5990 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
5991 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
5992 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
5993 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
5994 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
5995 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
5996 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5997 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
5998 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5999 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6000 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6001 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6002 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6003 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6004 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6005 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6006 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6007 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6008 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6011 Version 1.6.0 (2016-01-21)
6012 ==========================
6017 * The `#![no_std]` attribute causes a crate to not be linked to the
6018 standard library, but only the [core library][1.6co], as described
6019 in [RFC 1184]. The core library defines common types and traits but
6020 has no platform dependencies whatsoever, and is the basis for Rust
6021 software in environments that cannot support a full port of the
6022 standard library, such as operating systems. Most of the core
6023 library is now stable.
6029 [`Read::read_exact`],
6030 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6031 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6032 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6033 [`os::unix::fs::DirBuilderExt`],
6034 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6035 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6036 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6037 [`collections::hash_map::Drain`],
6038 [`collections::hash_map::HashMap::drain`],
6039 [`collections::hash_set::Drain`],
6040 [`collections::hash_set::HashSet::drain`],
6041 [`collections::binary_heap::Drain`],
6042 [`collections::binary_heap::BinaryHeap::drain`],
6043 [`Vec::extend_from_slice`] (renamed from `push_all`),
6044 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6045 [`RwLock::into_inner`],
6046 [`Iterator::min_by_key`] (renamed from `min_by`),
6047 [`Iterator::max_by_key`] (renamed from `max_by`).
6048 * The [core library][1.6co] is stable, as are most of its APIs.
6049 * [The `assert_eq!` macro supports arguments that don't implement
6050 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6052 * Several timer functions that take duration in milliseconds [are
6053 deprecated in favor of those that take `Duration`][1.6ms]. These
6054 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6055 `thread::park_timeout_ms`.
6056 * The algorithm by which `Vec` reserves additional elements was
6057 [tweaked to not allocate excessive space][1.6a] while still growing
6059 * `From` conversions are [implemented from integers to floats][1.6f]
6060 in cases where the conversion is lossless. Thus they are not
6061 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6062 or `f64`. They are also not implemented for `isize` and `usize`
6063 because the implementations would be platform-specific. `From` is
6064 also implemented from `f32` to `f64`.
6065 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6066 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6067 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6068 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6070 * Sorting slices that are already sorted [is 50% faster in some
6076 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6077 * Cargo build scripts can specify their dependencies by emitting the
6078 [`rerun-if-changed`][1.6rr] key.
6079 * crates.io will reject publication of crates with dependencies that
6080 have a wildcard version constraint. Crates with wildcard
6081 dependencies were seen to cause a variety of problems, as described
6082 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6084 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6085 release folder. A variety of artifacts that Cargo failed to clean
6086 are now correctly deleted.
6091 * The `unreachable_code` lint [warns when a function call's argument
6093 * The parser indicates [failures that may be caused by
6094 confusingly-similar Unicode characters][1.6uc]
6095 * Certain macro errors [are reported at definition time][1.6m], not
6101 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6102 environment variable when locating crates. This was a pre-cargo
6103 feature for integrating with the package manager that was
6104 accidentally never removed.
6105 * [A number of bugs were fixed in the privacy checker][1.6p] that
6106 could cause previously-accepted code to break.
6107 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6108 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6109 struct pattern syntax (`Foo(..)`) can no longer be used to match
6110 unit structs. This is a warning now, but will become an error in
6111 future releases. Patterns that share the same name as a const are
6113 * A bug was fixed that causes [rustc not to apply default type
6114 parameters][1.6xc] when resolving certain method implementations of
6115 traits defined in other crates.
6117 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6118 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6119 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6120 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6121 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6122 [1.6co]: http://doc.rust-lang.org/core/index.html
6123 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6124 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6125 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6126 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6127 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6128 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6129 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6130 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6131 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6132 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6133 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6134 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6135 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6136 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6137 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6138 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6139 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6140 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6141 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6142 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6143 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6144 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6145 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6146 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6147 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6148 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6149 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6150 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6151 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6152 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6153 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6154 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6155 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6156 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6157 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6158 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6159 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6160 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6161 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6162 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6163 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6166 Version 1.5.0 (2015-12-10)
6167 ==========================
6169 * ~700 changes, numerous bugfixes
6175 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6176 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6177 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6178 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6179 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6180 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6181 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6182 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6183 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6184 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6185 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6186 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6187 [`Path::read_link`], [`Path::symlink_metadata`],
6188 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6189 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6190 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6191 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6192 [`slice::split_first_mut`], [`slice::split_first`],
6193 [`slice::split_last_mut`], [`slice::split_last`],
6194 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6195 [`str::MatchIndices`], [`str::RMatchIndices`],
6196 [`str::match_indices`], [`str::rmatch_indices`],
6197 [`str::slice_mut_unchecked`], [`string::ParseError`].
6198 * Rust applications hosted on crates.io can be installed locally to
6199 `~/.cargo/bin` with the [`cargo install`] command. Among other
6200 things this makes it easier to augment Cargo with new subcommands:
6201 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6202 invoked as `cargo foo`.
6203 * Crates with wildcard (`*`) dependencies will [emit warnings when
6204 published][1.5w]. In 1.6 it will no longer be possible to publish
6205 crates with wildcard dependencies.
6210 * The rules determining when a particular lifetime must outlive
6211 a particular value (known as '[dropck]') have been [modified
6212 to not rely on parametricity][1.5p].
6213 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6214 and `Arc`][1.5a]. Because these smart pointer types implement
6215 `Deref`, this causes breakage in cases where the interior type
6216 contains methods of the same name.
6217 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6218 that they could drop their content. Soundness fix.
6219 * All method invocations are [properly checked][1.5wf1] for
6220 [well-formedness][1.5wf2]. Soundness fix.
6221 * Traits whose supertraits contain `Self` are [not object
6222 safe][1.5o]. Soundness fix.
6223 * Target specifications support a [`no_default_libraries`][1.5nd]
6224 setting that controls whether `-nodefaultlibs` is passed to the
6225 linker, and in turn the `is_like_windows` setting no longer affects
6226 the `-nodefaultlibs` flag.
6227 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6228 * The `#[inline]` and `#[repr]` attributes [can only appear
6229 in valid locations][1.5at].
6230 * Native libraries linked from the local crate are [passed to
6231 the linker before native libraries from upstream crates][1.5nl].
6232 * Two rarely-used attributes, `#[no_debug]` and
6233 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6234 * Negation of unsigned integers, which has been a warning for
6235 several releases, [is now behind a feature gate and will
6236 generate errors][1.5nu].
6237 * The parser accidentally accepted visibility modifiers on
6238 enum variants, a bug [which has been fixed][1.5ev].
6239 * [A bug was fixed that allowed `use` statements to import unstable
6245 * When evaluating expressions at compile-time that are not
6246 compile-time constants (const-evaluating expressions in non-const
6247 contexts), incorrect code such as overlong bitshifts and arithmetic
6248 overflow will [generate a warning instead of an error][1.5ce],
6249 delaying the error until runtime. This will allow the
6250 const-evaluator to be expanded in the future backwards-compatibly.
6251 * The `improper_ctypes` lint [no longer warns about using `isize` and
6252 `usize` in FFI][1.5ict].
6257 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6259 * `Default` is [implemented for mutable slices][1.5d].
6260 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6261 * There are now `From` conversions [between floating point
6262 types][1.5f] where the conversions are lossless.
6263 * There are now `From` conversions [between integer types][1.5i] where
6264 the conversions are lossless.
6265 * [`fs::Metadata` implements `Clone`][1.5fs].
6266 * The `parse` method [accepts a leading "+" when parsing
6268 * [`AsMut` is implemented for `Vec`][1.5am].
6269 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6270 been optimized][1.5cf] and no longer rely on the default impl.
6271 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6272 `unsafe extern "C"` function types now [implement `Clone`,
6273 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6274 `fmt::Debug` for up to 12 arguments][1.5fp].
6275 * [Dropping `Vec`s is much faster in unoptimized builds when the
6276 element types don't implement `Drop`][1.5dv].
6277 * A bug that caused in incorrect behavior when [combining `VecDeque`
6278 with zero-sized types][1.5vdz] was resolved.
6279 * [`PartialOrd` for slices is faster][1.5po].
6284 * [Crate metadata size was reduced by 20%][1.5md].
6285 * [Improvements to code generation reduced the size of libcore by 3.3
6286 MB and rustc's memory usage by 18MB][1.5m].
6287 * [Improvements to deref translation increased performance in
6288 unoptimized builds][1.5dr].
6289 * Various errors in trait resolution [are deduplicated to only be
6290 reported once][1.5te].
6291 * Rust has preliminary [support for rumprun kernels][1.5rr].
6292 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6294 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6295 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6296 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6297 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6298 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6299 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6300 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6301 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6302 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6303 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6304 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6305 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6306 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6307 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6308 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6309 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6310 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6311 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6312 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6313 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6314 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6315 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6316 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6317 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6318 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6319 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6320 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6321 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6322 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6323 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6324 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6325 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6326 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6327 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6328 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6329 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6330 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6331 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6332 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6333 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6334 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6335 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6336 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6337 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6338 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6339 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6340 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6341 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6342 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6343 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6344 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6345 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6346 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6347 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6348 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6349 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6350 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6351 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6352 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6353 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6354 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6355 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6356 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6357 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6358 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6359 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6360 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6361 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6362 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6363 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6364 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6365 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6366 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6367 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6368 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6369 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6370 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6371 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6372 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6373 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6374 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6375 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6376 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6377 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6378 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6379 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6380 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6381 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6382 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6384 Version 1.4.0 (2015-10-29)
6385 ==========================
6387 * ~1200 changes, numerous bugfixes
6392 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6393 GNU) are now supported and recommended for use.
6398 * [Several changes have been made to fix type soundness and improve
6399 the behavior of associated types][sound]. See [RFC 1214]. Although
6400 we have mostly introduced these changes as warnings this release, to
6401 become errors next release, there are still some scenarios that will
6402 see immediate breakage.
6403 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6404 line breaks in addition to `\n`][crlf].
6405 * [Loans of `'static` lifetime extend to the end of a function][stat].
6406 * [`str::parse` no longer introduces avoidable rounding error when
6407 parsing floating point numbers. Together with earlier changes to
6408 float formatting/output, "round trips" like f.to_string().parse()
6409 now preserve the value of f exactly. Additionally, leading plus
6410 signs are now accepted][fp3].
6416 * `use` statements that import multiple items [can now rename
6417 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6418 * [Binops work correctly on fat pointers][binfat].
6419 * `pub extern crate`, which does not behave as expected, [issues a
6420 warning][pec] until a better solution is found.
6425 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6426 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6427 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6428 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6429 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6430 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6431 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6432 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6433 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6434 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6435 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6436 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6437 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6438 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6439 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6440 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6441 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6442 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6444 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6445 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6446 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6447 `f64::from_str_radix`.
6448 * [Reverse-searching strings is faster with the 'two-way'
6450 * [`std::io::copy` allows `?Sized` arguments][cc].
6451 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6452 [override `count`, `nth` and `last` with an O(1)
6453 implementation][it].
6454 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6455 * [`IntoRawFd` has been added to the Unix-specific prelude,
6456 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6458 * [`Extend<String>` and `FromIterator<String` are both implemented for
6460 * [`IntoIterator` is implemented for references to `Option` and
6462 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6463 Copy`][ext] as part of [RFC 839]. This will cause type inference
6464 breakage in rare situations.
6465 * [`BinaryHeap` implements `Debug`][bh2].
6466 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6468 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6469 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6470 * [String comparison is faster][faststr].
6471 * `&mut T` where `T: std::fmt::Write` [also implements
6472 `std::fmt::Write`][mutw].
6473 * [A stable regression in `VecDeque::push_back` and other
6474 capacity-altering methods that caused panics for zero-sized types
6476 * [Function pointers implement traits for up to 12 parameters][fp2].
6481 * The compiler [no longer uses the 'morestack' feature to prevent
6482 stack overflow][mm]. Instead it uses guard pages and stack
6483 probes (though stack probes are not yet implemented on any platform
6485 * [The compiler matches traits faster when projections are involved][p].
6486 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6488 * [Cargo now displays useful information about what its doing during
6489 `cargo update`][cu].
6491 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6492 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6493 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6494 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6495 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6496 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6497 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6498 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6499 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6500 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6501 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6502 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6503 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6504 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6505 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6506 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6507 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6508 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6509 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6510 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6511 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6512 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6513 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6514 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6515 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6516 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6517 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6518 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6519 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6520 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6521 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6522 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6523 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6524 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6525 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6526 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6527 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6528 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6529 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6530 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6531 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6532 [bh2]: https://github.com/rust-lang/rust/pull/28156
6533 [binfat]: https://github.com/rust-lang/rust/pull/28270
6534 [bm]: https://github.com/rust-lang/rust/pull/28197
6535 [cc]: https://github.com/rust-lang/rust/pull/27531
6536 [crlf]: https://github.com/rust-lang/rust/pull/28034
6537 [cu]: https://github.com/rust-lang/cargo/pull/1931
6538 [d]: https://github.com/rust-lang/rust/pull/27825
6539 [dep]: https://github.com/rust-lang/rust/pull/28339
6540 [es]: https://github.com/rust-lang/rust/pull/27956
6541 [ext]: https://github.com/rust-lang/rust/pull/28094
6542 [faststr]: https://github.com/rust-lang/rust/pull/28338
6543 [ffi]: https://github.com/rust-lang/rust/pull/28779
6544 [fp]: https://github.com/rust-lang/rust/pull/28268
6545 [fp2]: https://github.com/rust-lang/rust/pull/28560
6546 [fp3]: https://github.com/rust-lang/rust/pull/27307
6547 [i]: https://github.com/rust-lang/rust/pull/27451
6548 [into2]: https://github.com/rust-lang/rust/pull/28039
6549 [it]: https://github.com/rust-lang/rust/pull/27652
6550 [mm]: https://github.com/rust-lang/rust/pull/27338
6551 [mutw]: https://github.com/rust-lang/rust/pull/28368
6552 [sound]: https://github.com/rust-lang/rust/pull/27641
6553 [p]: https://github.com/rust-lang/rust/pull/27866
6554 [pec]: https://github.com/rust-lang/rust/pull/28486
6555 [pr]: https://github.com/rust-lang/rust/pull/27896
6556 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6557 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6558 [s]: https://github.com/rust-lang/rust/pull/27474
6559 [stab]: https://github.com/rust-lang/rust/pull/28339
6560 [stat]: https://github.com/rust-lang/rust/pull/28321
6561 [vd]: https://github.com/rust-lang/rust/pull/28494
6563 Version 1.3.0 (2015-09-17)
6564 ==============================
6566 * ~900 changes, numerous bugfixes
6571 * The [new object lifetime defaults][nold] have been [turned
6572 on][nold2] after a cycle of warnings about the change. Now types
6573 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6574 being interpreted as `&'a Box<Trait+'a>` to `&'a
6575 Box<Trait+'static>`.
6576 * [The Rustonomicon][nom] is a new book in the official documentation
6577 that dives into writing unsafe Rust.
6578 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6579 timekeeping is employed by other std APIs, as well as out-of-tree
6585 * The [new object lifetime defaults][nold] have been [turned
6586 on][nold2] after a cycle of warnings about the change.
6587 * There is a known [regression][lr] in how object lifetime elision is
6588 interpreted, the proper solution for which is undetermined.
6589 * The `#[prelude_import]` attribute, an internal implementation
6590 detail, was accidentally stabilized previously. [It has been put
6591 behind the `prelude_import` feature gate][pi]. This change is
6592 believed to break no existing code.
6593 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6594 [more sane for dynamically sized types][dst3]. Code that relied on
6595 the previous behavior is thought to be broken.
6596 * The `dropck` rules, which checks that destructors can't access
6597 destroyed values, [have been updated][dropck] to match the
6598 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6599 cause some previously-compiling code to no longer build.
6604 * The [new object lifetime defaults][nold] have been [turned
6605 on][nold2] after a cycle of warnings about the change.
6606 * Semicolons may [now follow types and paths in
6607 macros](https://github.com/rust-lang/rust/pull/27000).
6608 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6609 [more sane for dynamically sized types][dst3]. Code that relied on
6610 the previous behavior is not known to exist, and suspected to be
6612 * `'static` variables [may now be recursive][st].
6613 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6614 implementations correctly.
6615 * The `dropck` rules, which checks that destructors can't access
6616 destroyed values, [have been updated][dropck] to match the
6622 * The [`Duration`] API, [has been stabilized][ds], as well as the
6623 `std::time` module, which presently contains only `Duration`.
6624 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6625 * The owned C string, [`CString`], implements [`Borrow`] and the
6626 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6627 these allow C strings to be borrowed and cloned in generic code.
6628 * [`CStr`] implements [`Debug`].
6629 * [`AtomicPtr`] implements [`Debug`].
6630 * [`Error`] trait objects [can be downcast to their concrete types][e]
6631 in many common configurations, using the [`is`], [`downcast`],
6632 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6634 * Searching for substrings now [employs the two-way algorithm][search]
6635 instead of doing a naive search. This gives major speedups to a
6636 number of methods, including [`contains`][sc], [`find`][sf],
6637 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6638 [`ends_with`][sew] are also faster.
6639 * The performance of `PartialEq` for slices is [much faster][ps].
6640 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6641 is overridden and optimized by the implementations for scalars.
6642 * The [`Hasher`] trait now has a number of specialized `write_*`
6643 methods for primitive types, for efficiency.
6644 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6645 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6646 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6647 of [`std::error::Error::cause`][iec] also delegates to the inner
6649 * [`process::Child`][pc] gained the [`id`] method, which returns a
6650 `u32` representing the platform-specific process identifier.
6651 * The [`connect`] method on slices is deprecated, replaced by the new
6652 [`join`] method (note that both of these are on the *unstable*
6653 [`SliceConcatExt`] trait, but through the magic of the prelude are
6654 available to stable code anyway).
6655 * The [`Div`] operator is implemented for [`Wrapping`] types.
6656 * [`DerefMut` is implemented for `String`][dms].
6657 * Performance of SipHash (the default hasher for `HashMap`) is
6658 [better for long data][sh].
6659 * [`AtomicPtr`] implements [`Send`].
6660 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6661 are now [specialized to use uninitialized buffers for increased
6663 * Lifetime parameters of foreign functions [are now resolved
6669 * Rust can now, with some coercion, [produce programs that run on
6670 Windows XP][xp], though XP is not considered a supported platform.
6671 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6672 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6673 recommended for use in 1.3, though should be fully-functional
6674 in the [64-bit 1.4 beta][b14].
6675 * On Fedora-based systems installation will [properly configure the
6676 dynamic linker][fl].
6677 * The compiler gained many new extended error descriptions, which can
6678 be accessed with the `--explain` flag.
6679 * The `dropck` pass, which checks that destructors can't access
6680 destroyed values, [has been rewritten][dropck]. This fixes some
6681 soundness holes, and as such will cause some previously-compiling
6682 code to no longer build.
6683 * `rustc` now uses [LLVM to write archive files where possible][ar].
6684 Eventually this will eliminate the compiler's dependency on the ar
6686 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
6687 supported FreeBSD on x86_64).
6688 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
6689 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
6691 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
6692 will kill the process instead of leaking][nlp].
6694 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
6695 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
6696 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
6697 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
6698 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
6699 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6700 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6701 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
6702 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
6703 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
6704 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
6705 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
6706 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
6707 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6708 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
6709 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
6710 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
6711 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
6712 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6713 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
6714 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
6715 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
6716 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
6717 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6718 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
6719 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
6720 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
6721 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
6722 [ar]: https://github.com/rust-lang/rust/pull/26926
6723 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
6724 [dms]: https://github.com/rust-lang/rust/pull/26241
6725 [dropck]: https://github.com/rust-lang/rust/pull/27261
6726 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6727 [ds]: https://github.com/rust-lang/rust/pull/26818
6728 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
6729 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
6730 [dst3]: https://github.com/rust-lang/rust/pull/27351
6731 [e]: https://github.com/rust-lang/rust/pull/24793
6732 [f]: https://github.com/rust-lang/rust/pull/26588
6733 [fb]: https://github.com/rust-lang/rust/pull/26959
6734 [fl]: https://github.com/rust-lang/rust-installer/pull/41
6735 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6736 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
6737 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
6738 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
6739 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
6740 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
6741 [lic]: https://github.com/rust-lang/rust/pull/26583
6742 [lnu]: https://github.com/rust-lang/rust/pull/27026
6743 [lr]: https://github.com/rust-lang/rust/issues/27248
6744 [lum]: https://github.com/rust-lang/rust/pull/26378
6745 [lur]: https://github.com/rust-lang/rust/pull/26783
6746 [nlp]: https://github.com/rust-lang/rust/pull/27176
6747 [nold2]: https://github.com/rust-lang/rust/pull/27045
6748 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
6749 [nom]: http://doc.rust-lang.org/nightly/nomicon/
6750 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
6751 [pi]: https://github.com/rust-lang/rust/pull/26699
6752 [ps]: https://github.com/rust-lang/rust/pull/26884
6753 [rte]: https://github.com/rust-lang/rust/pull/26950
6754 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6755 [search]: https://github.com/rust-lang/rust/pull/26327
6756 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6757 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6758 [sh]: https://github.com/rust-lang/rust/pull/27280
6759 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6760 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6761 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6762 [st]: https://github.com/rust-lang/rust/pull/26630
6763 [win1]: https://github.com/rust-lang/rust/pull/26569
6764 [win2]: https://github.com/rust-lang/rust/pull/26741
6765 [win3]: https://github.com/rust-lang/rust/pull/26741
6766 [win4]: https://github.com/rust-lang/rust/pull/27210
6767 [xp]: https://github.com/rust-lang/rust/pull/26569
6769 Version 1.2.0 (2015-08-07)
6770 ==========================
6772 * ~1200 changes, numerous bugfixes
6777 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6778 like `Rc` to contain types without a fixed size, arrays and trait
6779 objects, finally enabling use of `Rc<[T]>` and completing the
6780 implementation of DST.
6781 * [Parallel codegen][parcodegen] is now working again, which can
6782 substantially speed up large builds in debug mode; It also gets
6783 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6784 jobs). It's not enabled by default, but will be "in the near
6785 future". It can be activated with the `-C codegen-units=N` flag to
6787 * This is the first release with [experimental support for linking
6788 with the MSVC linker and lib C on Windows (instead of using the GNU
6789 variants via MinGW)][win]. It is yet recommended only for the most
6790 intrepid Rustaceans.
6791 * Benchmark compilations are showing a 30% improvement in
6792 bootstrapping over 1.1.
6797 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6798 unicode case mapping, which is a previously-planned change in
6799 behavior and considered a bugfix.
6800 * [`mem::align_of`] now specifies [the *minimum alignment* for
6801 T][align], which is usually the alignment programs are interested
6802 in, and the same value reported by clang's
6803 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6805 * [The `#[packed]` attribute is no longer silently accepted by the
6806 compiler][packed]. This attribute did nothing and code that
6807 mentioned it likely did not work as intended.
6808 * Associated type defaults are [now behind the
6809 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6810 defaults *did not work*, but could be mentioned syntactically. As
6811 such this breakage has minimal impact.
6816 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6817 matching against dereferenceable values.
6822 * The [`Extend`] trait, which grows a collection from an iterator, is
6823 implemented over iterators of references, for `String`, `Vec`,
6824 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6825 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6826 * The [`iter::once`] function returns an iterator that yields a single
6827 element, and [`iter::empty`] returns an iterator that yields no
6829 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6830 over substring matches.
6831 * [`Cell`] and [`RefCell`] both implement `Eq`.
6832 * A number of methods for wrapping arithmetic are added to the
6833 integral types, [`wrapping_div`], [`wrapping_rem`],
6834 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6835 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6836 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6837 type.. It is illegal for the default arithmetic operations in Rust
6838 to overflow; the desire to wrap must be explicit.
6839 * The `{:#?}` formatting specifier [displays the alternate,
6840 pretty-printed][debugfmt] form of the `Debug` formatter. This
6841 feature was actually introduced prior to 1.0 with little
6843 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
6844 for writing data to formatted strings, similar to [`io::Write`].
6845 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
6846 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
6847 are used by code generators to emit implementations of [`Debug`].
6848 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
6849 methods that convert case, following Unicode case mapping.
6850 * It is now easier to handle poisoned locks. The [`PoisonError`]
6851 type, returned by failing lock operations, exposes `into_inner`,
6852 `get_ref`, and `get_mut`, which all give access to the inner lock
6853 guard, and allow the poisoned lock to continue to operate. The
6854 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
6855 poisoned lock without attempting to take the lock.
6856 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
6857 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
6858 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
6859 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
6861 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
6867 * `rustc` employs smarter heuristics for guessing at [typos].
6868 * `rustc` emits more efficient code for [no-op conversions between
6869 unsafe pointers][nop].
6870 * Fat pointers are now [passed in pairs of immediate arguments][fat],
6871 resulting in faster compile times and smaller code.
6873 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
6874 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6875 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
6876 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
6877 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
6878 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
6879 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
6880 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
6881 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
6882 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
6883 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
6884 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
6885 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
6886 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
6887 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
6888 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
6889 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6890 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
6891 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
6892 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
6893 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
6894 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
6895 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
6896 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
6897 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
6898 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6899 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
6900 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
6901 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
6902 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
6903 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
6904 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
6905 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
6906 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6907 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6908 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
6909 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
6910 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
6911 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
6912 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
6913 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
6914 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6915 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
6916 [align]: https://github.com/rust-lang/rust/pull/25646
6917 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
6918 [typos]: https://github.com/rust-lang/rust/pull/26087
6919 [nop]: https://github.com/rust-lang/rust/pull/26336
6920 [fat]: https://github.com/rust-lang/rust/pull/26411
6921 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
6922 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
6923 [packed]: https://github.com/rust-lang/rust/pull/25541
6924 [ad]: https://github.com/rust-lang/rust/pull/27382
6925 [win]: https://github.com/rust-lang/rust/pull/25350
6927 Version 1.1.0 (2015-06-25)
6928 =========================
6930 * ~850 changes, numerous bugfixes
6935 * The [`std::fs` module has been expanded][fs] to expand the set of
6936 functionality exposed:
6937 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
6938 don't incur a syscall on some platforms.
6939 * A `symlink_metadata` function has been added.
6940 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
6941 access to all underlying information.
6942 * The compiler now contains extended explanations of many errors. When an error
6943 with an explanation occurs the compiler suggests using the `--explain` flag
6944 to read the explanation. Error explanations are also [available online][err-index].
6945 * Thanks to multiple [improvements][sk] to [type checking][pre], as
6946 well as other work, the time to bootstrap the compiler decreased by
6952 * The [`str::split_whitespace`] method splits a string on unicode
6953 whitespace boundaries.
6954 * On both Windows and Unix, new extension traits provide conversion of
6955 I/O types to and from the underlying system handles. On Unix, these
6956 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
6957 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
6958 `TcpListener`, and `UpdSocket`. Further implementations for
6959 `std::process` will be stabilized later.
6960 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
6961 Windows, symlinks can be created with
6962 `std::os::windows::symlink_dir` and
6963 `std::os::windows::symlink_file`.
6964 * The `mpsc::Receiver` type can now be converted into an iterator with
6965 `into_iter` on the [`IntoIterator`] trait.
6966 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
6967 implementation of the [`From`] trait.
6968 * The `Debug` implementation for `RangeFull` [creates output that is
6969 more consistent with other implementations][rf].
6970 * [`Debug` is implemented for `File`][file].
6971 * The `Default` implementation for `Arc` [no longer requires `Sync +
6973 * [The `Iterator` methods `count`, `nth`, and `last` have been
6974 overridden for slices to have O(1) performance instead of O(n)][si].
6975 * Incorrect handling of paths on Windows has been improved in both the
6976 compiler and the standard library.
6977 * [`AtomicPtr` gained a `Default` implementation][ap].
6978 * In accordance with Rust's policy on arithmetic overflow `abs` now
6979 [panics on overflow when debug assertions are enabled][abs].
6980 * The [`Cloned`] iterator, which was accidentally left unstable for
6981 1.0 [has been stabilized][c].
6982 * The [`Incoming`] iterator, which iterates over incoming TCP
6983 connections, and which was accidentally unnamable in 1.0, [is now
6984 properly exported][inc].
6985 * [`BinaryHeap`] no longer corrupts itself [when functions called by
6986 `sift_up` or `sift_down` panic][bh].
6987 * The [`split_off`] method of `LinkedList` [no longer corrupts
6988 the list in certain scenarios][ll].
6993 * Type checking performance [has improved notably][sk] with
6994 [multiple improvements][pre].
6995 * The compiler [suggests code changes][ch] for more errors.
6996 * rustc and it's build system have experimental support for [building
6997 toolchains against MUSL][m] instead of glibc on Linux.
6998 * The compiler defines the `target_env` cfg value, which is used for
6999 distinguishing toolchains that are otherwise for the same
7000 platform. Presently this is set to `gnu` for common GNU Linux
7001 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7002 * The [`cargo rustc`][crc] command invokes a build with custom flags
7004 * [Android executables are always position independent][pie].
7005 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7008 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7009 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7010 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7011 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7012 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7013 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7014 [rf]: https://github.com/rust-lang/rust/pull/24491
7015 [err-index]: https://doc.rust-lang.org/error-index.html
7016 [sk]: https://github.com/rust-lang/rust/pull/24615
7017 [pre]: https://github.com/rust-lang/rust/pull/25323
7018 [file]: https://github.com/rust-lang/rust/pull/24598
7019 [ch]: https://github.com/rust-lang/rust/pull/24683
7020 [arc]: https://github.com/rust-lang/rust/pull/24695
7021 [si]: https://github.com/rust-lang/rust/pull/24701
7022 [ap]: https://github.com/rust-lang/rust/pull/24834
7023 [m]: https://github.com/rust-lang/rust/pull/24777
7024 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7025 [crc]: https://github.com/rust-lang/cargo/pull/1568
7026 [pie]: https://github.com/rust-lang/rust/pull/24953
7027 [abs]: https://github.com/rust-lang/rust/pull/25441
7028 [c]: https://github.com/rust-lang/rust/pull/25496
7029 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7030 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7031 [inc]: https://github.com/rust-lang/rust/pull/25522
7032 [bh]: https://github.com/rust-lang/rust/pull/25856
7033 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7034 [ll]: https://github.com/rust-lang/rust/pull/26022
7035 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7036 [drop]: https://github.com/rust-lang/rust/pull/24935
7038 Version 1.0.0 (2015-05-15)
7039 ========================
7041 * ~1500 changes, numerous bugfixes
7046 * The vast majority of the standard library is now `#[stable]`. It is
7047 no longer possible to use unstable features with a stable build of
7049 * Many popular crates on [crates.io] now work on the stable release
7051 * Arithmetic on basic integer types now [checks for overflow in debug
7057 * Several [restrictions have been added to trait coherence][coh] in
7058 order to make it easier for upstream authors to change traits
7059 without breaking downstream code.
7060 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7061 improve error messages and macro behavior. For example, `0b1234` is
7062 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7063 * Trait bounds [are always invariant][inv], eliminating the need for
7064 the `PhantomFn` and `MarkerTrait` lang items, which have been
7066 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7067 "foo" as bar` syntax has been replaced with `extern crate foo as
7068 bar`, and Cargo now automatically translates "-" in *package* names
7069 to underscore for the crate name.
7070 * [Lifetime shadowing is an error][lt].
7071 * [`Send` no longer implies `'static`][send-rfc].
7072 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7073 `MyType::default()`.
7074 * Primitive types [now have inherent methods][prim-inherent],
7075 obviating the need for extension traits like `SliceExt`.
7076 * Methods with `Self: Sized` in their `where` clause are [considered
7077 object-safe][self-sized], allowing many extension traits like
7078 `IteratorExt` to be merged into the traits they extended.
7079 * You can now [refer to associated types][assoc-where] whose
7080 corresponding trait bounds appear only in a `where` clause.
7081 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7082 like `Send` and `Sync` are now library-defined.
7083 * A [Reflect trait][reflect] was introduced, which means that
7084 downcasting via the `Any` trait is effectively limited to concrete
7085 types. This helps retain the potentially-important "parametricity"
7086 property: generic code cannot behave differently for different type
7087 arguments except in minor ways.
7088 * The `unsafe_destructor` feature is now deprecated in favor of the
7089 [new `dropck`][dropck]. This change is a major reduction in unsafe
7095 * The `thread_local` module [has been renamed to `std::thread`][th].
7096 * The methods of `IteratorExt` [have been moved to the `Iterator`
7098 * Several traits that implement Rust's conventions for type
7099 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7100 [centralized in the `std::convert` module][con].
7101 * The `FromError` trait [was removed in favor of `From`][fe].
7102 * The basic sleep function [has moved to
7103 `std::thread::sleep_ms`][slp].
7104 * The `splitn` function now takes an `n` parameter that represents the
7105 number of items yielded by the returned iterator [instead of the
7106 number of 'splits'][spl].
7107 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7108 * [Derived implementations of `PartialOrd` now order enums according
7109 to their explicitly-assigned discriminants][po].
7110 * [Methods for searching strings are generic over `Pattern`s][pat],
7111 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7113 * [In method resolution, object methods are resolved before inherent
7115 * [`String::from_str` has been deprecated in favor of the `From` impl,
7116 `String::from`][sf].
7117 * [`io::Error` implements `Sync`][ios].
7118 * [The `words` method on `&str` has been replaced with
7119 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7121 * The new path and IO modules are complete and `#[stable]`. This
7122 was the major library focus for this cycle.
7123 * The path API was [revised][path-normalize] to normalize `.`,
7124 adjusting the tradeoffs in favor of the most common usage.
7125 * A large number of remaining APIs in `std` were also stabilized
7126 during this cycle; about 75% of the non-deprecated API surface
7128 * The new [string pattern API][string-pattern] landed, which makes
7129 the string slice API much more internally consistent and flexible.
7130 * A new set of [generic conversion traits][conversion] replaced
7131 many existing ad hoc traits.
7132 * Generic numeric traits were [completely removed][num-traits]. This
7133 was made possible thanks to inherent methods for primitive types,
7134 and the removal gives maximal flexibility for designing a numeric
7135 hierarchy in the future.
7136 * The `Fn` traits are now related via [inheritance][fn-inherit]
7137 and provide ergonomic [blanket implementations][fn-blanket].
7138 * The `Index` and `IndexMut` traits were changed to
7139 [take the index by value][index-value], enabling code like
7140 `hash_map["string"]` to work.
7141 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7142 `Copy` data is known to be `Clone` as well.
7147 * Many errors now have extended explanations that can be accessed with
7148 the `--explain` flag to `rustc`.
7149 * Many new examples have been added to the standard library
7151 * rustdoc has received a number of improvements focused on completion
7153 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7154 * Much headway was made on ecosystem-wide CI, making it possible
7155 to [compare builds for breakage][ci-compare].
7158 [crates.io]: http://crates.io
7159 [clo]: https://github.com/rust-lang/rust/pull/24034
7160 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7161 [con]: https://github.com/rust-lang/rust/pull/23875
7162 [cr]: https://github.com/rust-lang/rust/pull/23419
7163 [fe]: https://github.com/rust-lang/rust/pull/23879
7164 [ie]: https://github.com/rust-lang/rust/pull/23300
7165 [inv]: https://github.com/rust-lang/rust/pull/23938
7166 [ios]: https://github.com/rust-lang/rust/pull/24133
7167 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7168 [lt]: https://github.com/rust-lang/rust/pull/24057
7169 [meth]: https://github.com/rust-lang/rust/pull/24056
7170 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7171 [po]: https://github.com/rust-lang/rust/pull/24270
7172 [sf]: https://github.com/rust-lang/rust/pull/24517
7173 [slp]: https://github.com/rust-lang/rust/pull/23949
7174 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7175 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7176 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7177 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7178 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7179 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7180 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7181 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7182 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7183 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7184 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7185 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7186 [reflect]: https://github.com/rust-lang/rust/pull/23712
7187 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7188 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7189 [index-value]: https://github.com/rust-lang/rust/pull/23601
7190 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7191 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7192 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7193 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7194 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7195 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7198 Version 1.0.0-alpha.2 (2015-02-20)
7199 =====================================
7201 * ~1300 changes, numerous bugfixes
7205 * The various I/O modules were [overhauled][io-rfc] to reduce
7206 unnecessary abstractions and provide better interoperation with
7207 the underlying platform. The old `io` module remains temporarily
7209 * The standard library now [participates in feature gating][feat],
7210 so use of unstable libraries now requires a `#![feature(...)]`
7211 attribute. The impact of this change is [described on the
7212 forum][feat-forum]. [RFC][feat-rfc].
7216 * `for` loops [now operate on the `IntoIterator` trait][into],
7217 which eliminates the need to call `.iter()`, etc. to iterate
7218 over collections. There are some new subtleties to remember
7219 though regarding what sort of iterators various types yield, in
7220 particular that `for foo in bar { }` yields values from a move
7221 iterator, destroying the original collection. [RFC][into-rfc].
7222 * Objects now have [default lifetime bounds][obj], so you don't
7223 have to write `Box<Trait+'static>` when you don't care about
7224 storing references. [RFC][obj-rfc].
7225 * In types that implement `Drop`, [lifetimes must outlive the
7226 value][drop]. This will soon make it possible to safely
7227 implement `Drop` for types where `#[unsafe_destructor]` is now
7228 required. Read the [gorgeous RFC][drop-rfc] for details.
7229 * The fully qualified <T as Trait>::X syntax lets you set the Self
7230 type for a trait method or associated type. [RFC][ufcs-rfc].
7231 * References to types that implement `Deref<U>` now [automatically
7232 coerce to references][deref] to the dereferenced type `U`,
7233 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7234 should eliminate many unsightly uses of `&*`, as when converting
7235 from references to vectors into references to
7236 slices. [RFC][deref-rfc].
7237 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7238 `|:|`) is obsolete and closure kind is inferred from context.
7239 * [`Self` is a keyword][Self].
7243 * The `Show` and `String` formatting traits [have been
7244 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7245 their related purposes. Automatically getting a string
7246 conversion to use with `format!("{:?}", something_to_debug)` is
7247 now written `#[derive(Debug)]`.
7248 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7249 OsStr}`, provide strings in platform-specific encodings for easier
7250 interop with system APIs. [RFC][osstr-rfc].
7251 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7252 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7253 creating raw pointers.
7257 * Certain long error messages of the form 'expected foo found bar'
7258 are now [split neatly across multiple
7259 lines][multiline]. Examples in the PR.
7260 * On Unix Rust can be [uninstalled][un] by running
7261 `/usr/local/lib/rustlib/uninstall.sh`.
7262 * The `#[rustc_on_unimplemented]` attribute, requiring the
7263 'on_unimplemented' feature, lets rustc [display custom error
7264 messages when a trait is expected to be implemented for a type
7269 * Rust is tested against a [LALR grammar][lalr], which parses
7270 almost all the Rust files that rustc does.
7272 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7273 [close]: https://github.com/rust-lang/rust/pull/21843
7274 [deref]: https://github.com/rust-lang/rust/pull/21351
7275 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7276 [drop]: https://github.com/rust-lang/rust/pull/21972
7277 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7278 [feat]: https://github.com/rust-lang/rust/pull/21248
7279 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7280 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7281 [fmt]: https://github.com/rust-lang/rust/pull/21457
7282 [into]: https://github.com/rust-lang/rust/pull/20790
7283 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7284 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7285 [lalr]: https://github.com/rust-lang/rust/pull/21452
7286 [multiline]: https://github.com/rust-lang/rust/pull/19870
7287 [obj]: https://github.com/rust-lang/rust/pull/22230
7288 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7289 [onun]: https://github.com/rust-lang/rust/pull/20889
7290 [osstr]: https://github.com/rust-lang/rust/pull/21488
7291 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7292 [Self]: https://github.com/rust-lang/rust/pull/22158
7293 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7294 [un]: https://github.com/rust-lang/rust/pull/22256
7297 Version 1.0.0-alpha (2015-01-09)
7298 ==================================
7300 * ~2400 changes, numerous bugfixes
7304 * The language itself is considered feature complete for 1.0,
7305 though there will be many usability improvements and bugfixes
7306 before the final release.
7307 * Nearly 50% of the public API surface of the standard library has
7308 been declared 'stable'. Those interfaces are unlikely to change
7310 * The long-running debate over integer types has been
7311 [settled][ints]: Rust will ship with types named `isize` and
7312 `usize`, rather than `int` and `uint`, for pointer-sized
7313 integers. Guidelines will be rolled out during the alpha cycle.
7314 * Most crates that are not `std` have been moved out of the Rust
7315 distribution into the Cargo ecosystem so they can evolve
7316 separately and don't need to be stabilized as quickly, including
7317 'time', 'getopts', 'num', 'regex', and 'term'.
7318 * Documentation continues to be expanded with more API coverage, more
7319 examples, and more in-depth explanations. The guides have been
7320 consolidated into [The Rust Programming Language][trpl].
7321 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7322 * All official Rust binary installers now come with [Cargo], the
7323 Rust package manager.
7327 * Closures have been [completely redesigned][unboxed] to be
7328 implemented in terms of traits, can now be used as generic type
7329 bounds and thus monomorphized and inlined, or via an opaque
7330 pointer (boxed) as in the old system. The new system is often
7331 referred to as 'unboxed' closures.
7332 * Traits now support [associated types][assoc], allowing families
7333 of related types to be defined together and used generically in
7335 * Enum variants are [namespaced by their type names][enum].
7336 * [`where` clauses][where] provide a more versatile and attractive
7337 syntax for specifying generic bounds, though the previous syntax
7339 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7341 * Rust [no longer has a runtime][rt] of any description, and only
7342 supports OS threads, not green threads.
7343 * At long last, Rust has been overhauled for 'dynamically-sized
7344 types' ([DST]), which integrates 'fat pointers' (object types,
7345 arrays, and `str`) more deeply into the type system, making it
7347 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7348 `..j` that produce range types and which, when combined with the
7349 `Index` operator and multidispatch, leads to a convenient slice
7351 * The new range syntax revealed an ambiguity in the fixed-length
7352 array syntax, so now fixed length arrays [are written `[T;
7354 * The `Copy` trait is no longer implemented automatically. Unsafe
7355 pointers no longer implement `Sync` and `Send` so types
7356 containing them don't automatically either. `Sync` and `Send`
7357 are now 'unsafe traits' so one can "forcibly" implement them via
7358 `unsafe impl` if a type confirms to the requirements for them
7359 even though the internals do not (e.g. structs containing unsafe
7360 pointers like `Arc`). These changes are intended to prevent some
7361 footguns and are collectively known as [opt-in built-in
7362 traits][oibit] (though `Sync` and `Send` will soon become pure
7363 library types unknown to the compiler).
7364 * Operator traits now take their operands [by value][ops], and
7365 comparison traits can use multidispatch to compare one type
7366 against multiple other types, allowing e.g. `String` to be
7367 compared with `&str`.
7368 * `if let` and `while let` are no longer feature-gated.
7369 * Rust has adopted a more [uniform syntax for escaping unicode
7370 characters][unicode].
7371 * `macro_rules!` [has been declared stable][mac]. Though it is a
7372 flawed system it is sufficiently popular that it must be usable
7373 for 1.0. Effort has gone into [future-proofing][mac-future] it
7374 in ways that will allow other macro systems to be developed in
7375 parallel, and won't otherwise impact the evolution of the
7377 * The prelude has been [pared back significantly][prelude] such
7378 that it is the minimum necessary to support the most pervasive
7379 code patterns, and through [generalized where clauses][where]
7380 many of the prelude extension traits have been consolidated.
7381 * Rust's rudimentary reflection [has been removed][refl], as it
7382 incurred too much code generation for little benefit.
7383 * [Struct variants][structvars] are no longer feature-gated.
7384 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7385 known as 'higher-ranked trait bounds', this crucially allows
7386 unboxed closures to work.
7387 * Macros invocations surrounded by parens or square brackets and
7388 not terminated by a semicolon are [parsed as
7389 expressions][macros], which makes expressions like `vec![1i32,
7390 2, 3].len()` work as expected.
7391 * Trait objects now implement their traits automatically, and
7392 traits that can be coerced to objects now must be [object
7394 * Automatically deriving traits is now done with `#[derive(...)]`
7395 not `#[deriving(...)]` for [consistency with other naming
7396 conventions][derive].
7397 * Importing the containing module or enum at the same time as
7398 items or variants they contain is [now done with `self` instead
7399 of `mod`][self], as in use `foo::{self, bar}`
7400 * Glob imports are no longer feature-gated.
7401 * The `box` operator and `box` patterns have been feature-gated
7402 pending a redesign. For now unique boxes should be allocated
7403 like other containers, with `Box::new`.
7407 * A [series][coll1] of [efforts][coll2] to establish
7408 [conventions][coll3] for collections types has resulted in API
7409 improvements throughout the standard library.
7410 * New [APIs for error handling][err] provide ergonomic interop
7411 between error types, and [new conventions][err-conv] describe
7412 more clearly the recommended error handling strategies in Rust.
7413 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7414 it is easier to discuss failure in the context of error handling
7415 without making clarifications as to whether you are referring to
7416 the 'fail' macro or failure more generally.
7417 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7418 syscall when available.
7419 * The 'serialize' crate has been renamed 'rustc-serialize' and
7420 moved out of the distribution to Cargo. Although it is widely
7421 used now, it is expected to be superseded in the near future.
7422 * The `Show` formatter, typically implemented with
7423 `#[derive(Show)]` is [now requested with the `{:?}`
7424 specifier][show] and is intended for use by all types, for uses
7425 such as `println!` debugging. The new `String` formatter must be
7426 implemented by hand, uses the `{}` specifier, and is intended
7427 for full-fidelity conversions of things that can logically be
7428 represented as strings.
7432 * [Flexible target specification][flex] allows rustc's code
7433 generation to be configured to support otherwise-unsupported
7435 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7436 respective debuggers with Rust-appropriate pretty-printing.
7437 * The Windows installation of Rust is distributed with the
7438 MinGW components currently required to link binaries on that
7443 * Nullable enum optimizations have been extended to more types so
7444 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7445 space than the inner types themselves.
7446 * Work has begun on supporting AArch64.
7448 [Cargo]: https://crates.io
7449 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7450 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7451 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7452 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7453 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7454 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7455 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7456 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7457 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7458 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7459 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7460 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7461 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7462 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7463 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7464 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7465 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7466 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7467 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7468 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7469 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7470 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7471 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7472 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7473 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7474 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7475 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7476 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7477 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7478 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7479 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7480 [trpl]: https://doc.rust-lang.org/book/index.html
7481 [rbe]: http://rustbyexample.com/
7484 Version 0.12.0 (2014-10-09)
7485 =============================
7487 * ~1900 changes, numerous bugfixes
7491 * The introductory documentation (now called The Rust Guide) has
7492 been completely rewritten, as have a number of supplementary
7494 * Rust's package manager, Cargo, continues to improve and is
7495 sometimes considered to be quite awesome.
7496 * Many API's in `std` have been reviewed and updated for
7497 consistency with the in-development Rust coding
7498 guidelines. The standard library documentation tracks
7499 stabilization progress.
7500 * Minor libraries have been moved out-of-tree to the rust-lang org
7501 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7502 be installed with Cargo.
7503 * Lifetime elision allows lifetime annotations to be left off of
7504 function declarations in many common scenarios.
7505 * Rust now works on 64-bit Windows.
7508 * Indexing can be overloaded with the `Index` and `IndexMut`
7510 * The `if let` construct takes a branch only if the `let` pattern
7511 matches, currently behind the 'if_let' feature gate.
7512 * 'where clauses', a more flexible syntax for specifying trait
7513 bounds that is more aesthetic, have been added for traits and
7514 free functions. Where clauses will in the future make it
7515 possible to constrain associated types, which would be
7516 impossible with the existing syntax.
7517 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7518 the 'slicing_syntax' feature gate, and can be overloaded with
7519 the `Slice` or `SliceMut` traits.
7520 * The syntax for matching of sub-slices has been changed to use a
7521 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7522 consistency with other uses of `..` and to future-proof
7523 potential additional uses of the syntax.
7524 * The syntax for matching inclusive ranges in patterns has changed
7525 from `0..3` to `0...4` to be consistent with the exclusive range
7527 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7528 c]`) has been put behind the 'advanced_slice_patterns' feature
7529 gate and may be removed in the future.
7530 * Components of tuples and tuple structs can be extracted using
7531 the `value.0` syntax, currently behind the `tuple_indexing`
7533 * The `#[crate_id]` attribute is no longer supported; versioning
7534 is handled by the package manager.
7535 * Renaming crate imports are now written `extern crate foo as bar`
7536 instead of `extern crate bar = foo`.
7537 * Renaming use statements are now written `use foo as bar` instead
7539 * `let` and `match` bindings and argument names in macros are now
7541 * The new, more efficient, closure types ('unboxed closures') have
7542 been added under a feature gate, 'unboxed_closures'. These will
7543 soon replace the existing closure types, once higher-ranked
7544 trait lifetimes are added to the language.
7545 * `move` has been added as a keyword, for indicating closures
7546 that capture by value.
7547 * Mutation and assignment is no longer allowed in pattern guards.
7548 * Generic structs and enums can now have trait bounds.
7549 * The `Share` trait is now called `Sync` to free up the term
7550 'shared' to refer to 'shared reference' (the default reference
7552 * Dynamically-sized types have been mostly implemented,
7553 unifying the behavior of fat-pointer types with the rest of the
7555 * As part of dynamically-sized types, the `Sized` trait has been
7556 introduced, which qualifying types implement by default, and
7557 which type parameters expect by default. To specify that a type
7558 parameter does not need to be sized, write `<Sized? T>`. Most
7559 types are `Sized`, notable exceptions being unsized arrays
7560 (`[T]`) and trait types.
7561 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7562 * Lifetime bounds can now be applied to type parameters and object
7564 * The old, reference counted GC type, `Gc<T>` which was once
7565 denoted by the `@` sigil, has finally been removed. GC will be
7566 revisited in the future.
7569 * Library documentation has been improved for a number of modules.
7570 * Bit-vectors, collections::bitv has been modernized.
7571 * The url crate is deprecated in favor of
7572 http://github.com/servo/rust-url, which can be installed with
7574 * Most I/O stream types can be cloned and subsequently closed from
7576 * A `std::time::Duration` type has been added for use in I/O
7577 methods that rely on timers, as well as in the 'time' crate's
7578 `Timespec` arithmetic.
7579 * The runtime I/O abstraction layer that enabled the green thread
7580 scheduler to do non-thread-blocking I/O has been removed, along
7581 with the libuv-based implementation employed by the green thread
7582 scheduler. This will greatly simplify the future I/O work.
7583 * `collections::btree` has been rewritten to have a more
7584 idiomatic and efficient design.
7587 * rustdoc output now indicates the stability levels of API's.
7588 * The `--crate-name` flag can specify the name of the crate
7589 being compiled, like `#[crate_name]`.
7590 * The `-C metadata` specifies additional metadata to hash into
7591 symbol names, and `-C extra-filename` specifies additional
7592 information to put into the output filename, for use by the
7593 package manager for versioning.
7594 * debug info generation has continued to improve and should be
7595 more reliable under both gdb and lldb.
7596 * rustc has experimental support for compiling in parallel
7597 using the `-C codegen-units` flag.
7598 * rustc no longer encodes rpath information into binaries by
7602 * Stack usage has been optimized with LLVM lifetime annotations.
7603 * Official Rust binaries on Linux are more compatible with older
7604 kernels and distributions, built on CentOS 5.10.
7607 Version 0.11.0 (2014-07-02)
7608 ==========================
7610 * ~1700 changes, numerous bugfixes
7613 * ~[T] has been removed from the language. This type is superseded by
7615 * ~str has been removed from the language. This type is superseded by
7617 * ~T has been removed from the language. This type is superseded by the
7619 * @T has been removed from the language. This type is superseded by the
7620 standard library's std::gc::Gc<T> type.
7621 * Struct fields are now all private by default.
7622 * Vector indices and shift amounts are both required to be a `uint`
7623 instead of any integral type.
7624 * Byte character, byte string, and raw byte string literals are now all
7625 supported by prefixing the normal literal with a `b`.
7626 * Multiple ABIs are no longer allowed in an ABI string
7627 * The syntax for lifetimes on closures/procedures has been tweaked
7628 slightly: `<'a>|A, B|: 'b + K -> T`
7629 * Floating point modulus has been removed from the language; however it
7630 is still provided by a library implementation.
7631 * Private enum variants are now disallowed.
7632 * The `priv` keyword has been removed from the language.
7633 * A closure can no longer be invoked through a &-pointer.
7634 * The `use foo, bar, baz;` syntax has been removed from the language.
7635 * The transmute intrinsic no longer works on type parameters.
7636 * Statics now allow blocks/items in their definition.
7637 * Trait bounds are separated from objects with + instead of : now.
7638 * Objects can no longer be read while they are mutably borrowed.
7639 * The address of a static is now marked as insignificant unless the
7640 #[inline(never)] attribute is placed it.
7641 * The #[unsafe_destructor] attribute is now behind a feature gate.
7642 * Struct literals are no longer allowed in ambiguous positions such as
7643 if, while, match, and for..in.
7644 * Declaration of lang items and intrinsics are now feature-gated by
7646 * Integral literals no longer default to `int`, and floating point
7647 literals no longer default to `f64`. Literals must be suffixed with an
7648 appropriate type if inference cannot determine the type of the
7650 * The Box<T> type is no longer implicitly borrowed to &mut T.
7651 * Procedures are now required to not capture borrowed references.
7654 * The standard library is now a "facade" over a number of underlying
7655 libraries. This means that development on the standard library should
7656 be speedier due to smaller crates, as well as a clearer line between
7658 * A new library, libcore, lives under the standard library's facade
7659 which is Rust's "0-assumption" library, suitable for embedded and
7660 kernel development for example.
7661 * A regex crate has been added to the standard distribution. This crate
7662 includes statically compiled regular expressions.
7663 * The unwrap/unwrap_err methods on Result require a Show bound for
7664 better error messages.
7665 * The return types of the std::comm primitives have been centralized
7666 around the Result type.
7667 * A number of I/O primitives have gained the ability to time out their
7669 * A number of I/O primitives have gained the ability to close their
7670 reading/writing halves to cancel pending operations.
7671 * Reverse iterator methods have been removed in favor of `rev()` on
7672 their forward-iteration counterparts.
7673 * A bitflags! macro has been added to enable easy interop with C and
7674 management of bit flags.
7675 * A debug_assert! macro is now provided which is disabled when
7676 `--cfg ndebug` is passed to the compiler.
7677 * A graphviz crate has been added for creating .dot files.
7678 * The std::cast module has been migrated into std::mem.
7679 * The std::local_data api has been migrated from freestanding functions
7680 to being based on methods.
7681 * The Pod trait has been renamed to Copy.
7682 * jemalloc has been added as the default allocator for types.
7683 * The API for allocating memory has been changed to use proper alignment
7684 and sized deallocation
7685 * Connecting a TcpStream or binding a TcpListener is now based on a
7686 string address and a u16 port. This allows connecting to a hostname as
7688 * The Reader trait now contains a core method, read_at_least(), which
7689 correctly handles many repeated 0-length reads.
7690 * The process-spawning API is now centered around a builder-style
7692 * The :? printing qualifier has been moved from the standard library to
7693 an external libdebug crate.
7694 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
7695 have been renamed to Eq/Ord.
7696 * The select/plural methods have been removed from format!. The escapes
7697 for { and } have also changed from \{ and \} to {{ and }},
7699 * The TaskBuilder API has been re-worked to be a true builder, and
7700 extension traits for spawning native/green tasks have been added.
7703 * All breaking changes to the language or libraries now have their
7704 commit message annotated with `[breaking-change]` to allow for easy
7705 discovery of breaking changes.
7706 * The compiler will now try to suggest how to annotate lifetimes if a
7707 lifetime-related error occurs.
7708 * Debug info continues to be improved greatly with general bug fixes and
7709 better support for situations like link time optimization (LTO).
7710 * Usage of syntax extensions when cross-compiling has been fixed.
7711 * Functionality equivalent to GCC & Clang's -ffunction-sections,
7712 -fdata-sections and --gc-sections has been enabled by default
7713 * The compiler is now stricter about where it will load module files
7714 from when a module is declared via `mod foo;`.
7715 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
7716 Syntax extensions are now discovered via a "plugin registrar" type
7717 which will be extended in the future to other various plugins.
7718 * Lints have been restructured to allow for dynamically loadable lints.
7719 * A number of rustdoc improvements:
7720 * The HTML output has been visually redesigned.
7721 * Markdown is now powered by hoedown instead of sundown.
7722 * Searching heuristics have been greatly improved.
7723 * The search index has been reduced in size by a great amount.
7724 * Cross-crate documentation via `pub use` has been greatly improved.
7725 * Primitive types are now hyperlinked and documented.
7726 * Documentation has been moved from static.rust-lang.org/doc to
7728 * A new sandbox, play.rust-lang.org, is available for running and
7729 sharing rust code examples on-line.
7730 * Unused attributes are now more robustly warned about.
7731 * The dead_code lint now warns about unused struct fields.
7732 * Cross-compiling to iOS is now supported.
7733 * Cross-compiling to mipsel is now supported.
7734 * Stability attributes are now inherited by default and no longer apply
7735 to intra-crate usage, only inter-crate usage.
7736 * Error message related to non-exhaustive match expressions have been
7740 Version 0.10 (2014-04-03)
7741 =========================
7743 * ~1500 changes, numerous bugfixes
7746 * A new RFC process is now in place for modifying the language.
7747 * Patterns with `@`-pointers have been removed from the language.
7748 * Patterns with unique vectors (`~[T]`) have been removed from the
7750 * Patterns with unique strings (`~str`) have been removed from the
7752 * `@str` has been removed from the language.
7753 * `@[T]` has been removed from the language.
7754 * `@self` has been removed from the language.
7755 * `@Trait` has been removed from the language.
7756 * Headers on `~` allocations which contain `@` boxes inside the type for
7757 reference counting have been removed.
7758 * The semantics around the lifetimes of temporary expressions have changed,
7759 see #3511 and #11585 for more information.
7760 * Cross-crate syntax extensions are now possible, but feature gated. See
7761 #11151 for more information. This includes both `macro_rules!` macros as
7762 well as syntax extensions such as `format!`.
7763 * New lint modes have been added, and older ones have been turned on to be
7765 * Unnecessary parentheses
7768 * Uppercase variables
7769 * Publicly visible private types
7770 * `#[deriving]` with raw pointers
7771 * Unsafe functions can no longer be coerced to closures.
7772 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7773 * The `#[simd]` attribute is now behind a feature gate.
7774 * Visibility is no longer allowed on `extern crate` statements, and
7775 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7776 * Trailing commas are now allowed in argument lists and tuple patterns.
7777 * The `do` keyword has been removed, it is now a reserved keyword.
7778 * Default type parameters have been implemented, but are feature gated.
7779 * Borrowed variables through captures in closures are now considered soundly.
7780 * `extern mod` is now `extern crate`
7781 * The `Freeze` trait has been removed.
7782 * The `Share` trait has been added for types that can be shared among
7784 * Labels in macros are now hygienic.
7785 * Expression/statement macro invocations can be delimited with `{}` now.
7786 * Treatment of types allowed in `static mut` locations has been tweaked.
7787 * The `*` and `.` operators are now overloadable through the `Deref` and
7789 * `~Trait` and `proc` no longer have `Send` bounds by default.
7790 * Partial type hints are now supported with the `_` type marker.
7791 * An `Unsafe` type was introduced for interior mutability. It is now
7792 considered undefined to transmute from `&T` to `&mut T` without using the
7794 * The #[linkage] attribute was implemented for extern statics/functions.
7795 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7796 * `Pod` was renamed to `Copy`.
7799 * The `libextra` library has been removed. It has now been decomposed into
7800 component libraries with smaller and more focused nuggets of
7801 functionality. The full list of libraries can be found on the
7802 documentation index page.
7803 * std: `std::condition` has been removed. All I/O errors are now propagated
7804 through the `Result` type. In order to assist with error handling, a
7805 `try!` macro for unwrapping errors with an early return and a lint for
7806 unused results has been added. See #12039 for more information.
7807 * std: The `vec` module has been renamed to `slice`.
7808 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7809 This will become the only growable vector in the future.
7810 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7811 are now found at `std::io::BufferedReader` instead of
7812 `std::io::buffered::BufferedReader`.
7813 * std: `print` and `println` are no longer in the prelude, the `print!` and
7814 `println!` macros are intended to be used instead.
7815 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7816 attempts to statically prevent cycles.
7817 * std: The standard distribution is adopting the policy of pushing failure
7818 to the user rather than failing in libraries. Many functions (such as
7819 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7820 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7821 deriving mode: `#[deriving(Show)]`.
7822 * std: `ToStr` is now implemented for all types implementing `Show`.
7823 * std: The formatting trait methods now take `&self` instead of `&T`
7824 * std: The `invert()` method on iterators has been renamed to `rev()`
7825 * std: `std::num` has seen a reduction in the genericity of its traits,
7826 consolidating functionality into a few core traits.
7827 * std: Backtraces are now printed on task failure if the environment
7828 variable `RUST_BACKTRACE` is present.
7829 * std: Naming conventions for iterators have been standardized. More details
7830 can be found on the wiki's style guide.
7831 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7832 still implement the function.
7833 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7834 * std: `assert_approx_eq!` has been removed
7835 * std: The `e` and `E` formatting specifiers for floats have been added to
7836 print them in exponential notation.
7837 * std: The `Times` trait has been removed
7838 * std: Indications of variance and opting out of builtin bounds is done
7839 through marker types in `std::kinds::marker` now
7840 * std: `hash` has been rewritten, `IterBytes` has been removed, and
7841 `#[deriving(Hash)]` is now possible.
7842 * std: `SharedChan` has been removed, `Sender` is now cloneable.
7843 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
7844 * std: `Chan::new` is now `channel()`.
7845 * std: A new synchronous channel type has been implemented.
7846 * std: A `select!` macro is now provided for selecting over `Receiver`s.
7847 * std: `hashmap` and `trie` have been moved to `libcollections`
7848 * std: `run` has been rolled into `io::process`
7849 * std: `assert_eq!` now uses `{}` instead of `{:?}`
7850 * std: The equality and comparison traits have seen some reorganization.
7851 * std: `rand` has moved to `librand`.
7852 * std: `to_{lower,upper}case` has been implemented for `char`.
7853 * std: Logging has been moved to `liblog`.
7854 * collections: `HashMap` has been rewritten for higher performance and less
7856 * native: The default runtime is now `libnative`. If `libgreen` is desired,
7857 it can be booted manually. The runtime guide has more information and
7859 * native: All I/O functionality except signals has been implemented.
7860 * green: Task spawning with `libgreen` has been optimized with stack caching
7861 and various trimming of code.
7862 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
7863 * sync: The `extra::sync` module has been updated to modern rust (and moved
7864 to the `sync` library), tweaking and improving various interfaces while
7865 dropping redundant functionality.
7866 * sync: A new `Barrier` type has been added to the `sync` library.
7867 * sync: An efficient mutex for native and green tasks has been implemented.
7868 * serialize: The `base64` module has seen some improvement. It treats
7869 newlines better, has non-string error values, and has seen general
7871 * fourcc: A `fourcc!` macro was introduced
7872 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
7873 hexadecimal literal.
7876 * `rustpkg` has been deprecated and removed from the main repository. Its
7877 replacement, `cargo`, is under development.
7878 * Nightly builds of rust are now available
7879 * The memory usage of rustc has been improved many times throughout this
7881 * The build process supports disabling rpath support for the rustc binary
7883 * Code generation has improved in some cases, giving more information to the
7884 LLVM optimization passes to enable more extensive optimizations.
7885 * Debuginfo compatibility with lldb on OSX has been restored.
7886 * The master branch is now gated on an android bot, making building for
7887 android much more reliable.
7888 * Output flags have been centralized into one `--emit` flag.
7889 * Crate type flags have been centralized into one `--crate-type` flag.
7890 * Codegen flags have been consolidated behind a `-C` flag.
7891 * Linking against outdated crates now has improved error messages.
7892 * Error messages with lifetimes will often suggest how to annotate the
7893 function to fix the error.
7894 * Many more types are documented in the standard library, and new guides
7896 * Many `rustdoc` improvements:
7897 * code blocks are syntax highlighted.
7898 * render standalone markdown files.
7899 * the --test flag tests all code blocks by default.
7900 * exported macros are displayed.
7901 * re-exported types have their documentation inlined at the location of the
7903 * search works across crates that have been rendered to the same output
7907 Version 0.9 (2014-01-09)
7908 ==========================
7910 * ~1800 changes, numerous bugfixes
7913 * The `float` type has been removed. Use `f32` or `f64` instead.
7914 * A new facility for enabling experimental features (feature gating) has
7915 been added, using the crate-level `#[feature(foo)]` attribute.
7916 * Managed boxes (@) are now behind a feature gate
7917 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
7918 standard library's `Gc` or `Rc` types instead.
7919 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
7920 * Jumping back to the top of a loop is now done with `continue` instead of
7922 * Strings can no longer be mutated through index assignment.
7923 * Raw strings can be created via the basic `r"foo"` syntax or with matched
7924 hash delimiters, as in `r###"foo"###`.
7925 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
7927 * The `&fn` type is now written `|args| -> ret` to match the literal form.
7928 * `@fn`s have been removed.
7929 * `do` only works with procs in order to make it obvious what the cost
7931 * Single-element tuple-like structs can no longer be dereferenced to
7932 obtain the inner value. A more comprehensive solution for overloading
7933 the dereference operator will be provided in the future.
7934 * The `#[link(...)]` attribute has been replaced with
7935 `#[crate_id = "name#vers"]`.
7936 * Empty `impl`s must be terminated with empty braces and may not be
7937 terminated with a semicolon.
7938 * Keywords are no longer allowed as lifetime names; the `self` lifetime
7939 no longer has any special meaning.
7940 * The old `fmt!` string formatting macro has been removed.
7941 * `printf!` and `printfln!` (old-style formatting) removed in favor of
7942 `print!` and `println!`.
7943 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
7944 * The `extern mod foo (name = "bar")` syntax has been removed. Use
7945 `extern mod foo = "bar"` instead.
7946 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
7947 * Macros can have attributes.
7948 * Macros can expand to items with attributes.
7949 * Macros can expand to multiple items.
7950 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
7951 * Comments may be nested.
7952 * Values automatically coerce to trait objects they implement, without
7954 * Enum discriminants are no longer an entire word but as small as needed to
7955 contain all the variants. The `repr` attribute can be used to override
7956 the discriminant size, as in `#[repr(int)]` for integer-sized, and
7957 `#[repr(C)]` to match C enums.
7958 * Non-string literals are not allowed in attributes (they never worked).
7959 * The FFI now supports variadic functions.
7960 * Octal numeric literals, as in `0o7777`.
7961 * The `concat!` syntax extension performs compile-time string concatenation.
7962 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
7963 removed as Rust no longer uses segmented stacks.
7964 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
7965 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
7966 not `*`; ignoring remaining fields of a struct is also done with `..`,
7967 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
7968 * `rustc` supports the "win64" calling convention via `extern "win64"`.
7969 * `rustc` supports the "system" calling convention, which defaults to the
7970 preferred convention for the target platform, "stdcall" on 32-bit Windows,
7972 * The `type_overflow` lint (default: warn) checks literals for overflow.
7973 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
7974 * The `attribute_usage` lint (default: warn) warns about unknown
7976 * The `unknown_features` lint (default: warn) warns about unknown
7978 * The `dead_code` lint (default: warn) checks for dead code.
7979 * Rust libraries can be linked statically to one another
7980 * `#[link_args]` is behind the `link_args` feature gate.
7981 * Native libraries are now linked with `#[link(name = "foo")]`
7982 * Native libraries can be statically linked to a rust crate
7983 (`#[link(name = "foo", kind = "static")]`).
7984 * Native OS X frameworks are now officially supported
7985 (`#[link(name = "foo", kind = "framework")]`).
7986 * The `#[thread_local]` attribute creates thread-local (not task-local)
7987 variables. Currently behind the `thread_local` feature gate.
7988 * The `return` keyword may be used in closures.
7989 * Types that can be copied via a memcpy implement the `Pod` kind.
7990 * The `cfg` attribute can now be used on struct fields and enum variants.
7993 * std: The `option` and `result` API's have been overhauled to make them
7994 simpler, more consistent, and more composable.
7995 * std: The entire `std::io` module has been replaced with one that is
7996 more comprehensive and that properly interfaces with the underlying
7997 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
7999 * std: `io::util` contains a number of useful implementations of
8000 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8001 `ZeroReader`, `TeeReader`.
8002 * std: The reference counted pointer type `extra::rc` moved into std.
8003 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8004 just a wrapper around it).
8005 * std: The `Either` type has been removed.
8006 * std: `fmt::Default` can be implemented for any type to provide default
8007 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8008 * std: The `rand` API continues to be tweaked.
8009 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8010 on failure in gdb, is now named `rust_fail`.
8011 * std: The `each_key` and `each_value` methods on `HashMap` have been
8012 replaced by the `keys` and `values` iterators.
8013 * std: Functions dealing with type size and alignment have moved from the
8014 `sys` module to the `mem` module.
8015 * std: The `path` module was written and API changed.
8016 * std: `str::from_utf8` has been changed to cast instead of allocate.
8017 * std: `starts_with` and `ends_with` methods added to vectors via the
8018 `ImmutableEqVector` trait, which is in the prelude.
8019 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8020 if the index is out of bounds.
8021 * std: Task failure no longer propagates between tasks, as the model was
8022 complex, expensive, and incompatible with thread-based tasks.
8023 * std: The `Any` type can be used for dynamic typing.
8024 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8026 * std: Methods that produce iterators generally do not have an `_iter`
8028 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8029 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8030 * std: `util::ignore` renamed to `prelude::drop`.
8031 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8033 * std: `vec::raw` has seen a lot of cleanup and API changes.
8034 * std: The standard library no longer includes any C++ code, and very
8035 minimal C, eliminating the dependency on libstdc++.
8036 * std: Runtime scheduling and I/O functionality has been factored out into
8037 extensible interfaces and is now implemented by two different crates:
8038 libnative, for native threading and I/O; and libgreen, for green threading
8039 and I/O. This paves the way for using the standard library in more limited
8040 embedded environments.
8041 * std: The `comm` module has been rewritten to be much faster, have a
8042 simpler, more consistent API, and to work for both native and green
8044 * std: All libuv dependencies have been moved into the rustuv crate.
8045 * native: New implementations of runtime scheduling on top of OS threads.
8046 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8048 * green: The green thread scheduler and message passing types are almost
8050 * extra: The `flatpipes` module had bitrotted and was removed.
8051 * extra: All crypto functions have been removed and Rust now has a policy of
8052 not reimplementing crypto in the standard library. In the future crypto
8053 will be provided by external crates with bindings to established libraries.
8054 * extra: `c_vec` has been modernized.
8055 * extra: The `sort` module has been removed. Use the `sort` method on
8059 * The `rust` and `rusti` commands have been removed, due to lack of
8061 * `rustdoc` was completely rewritten.
8062 * `rustdoc` can test code examples in documentation.
8063 * `rustpkg` can test packages with the argument, 'test'.
8064 * `rustpkg` supports arbitrary dependencies, including C libraries.
8065 * `rustc`'s support for generating debug info is improved again.
8066 * `rustc` has better error reporting for unbalanced delimiters.
8067 * `rustc`'s JIT support was removed due to bitrot.
8068 * Executables and static libraries can be built with LTO (-Z lto)
8069 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8073 Version 0.8 (2013-09-26)
8074 ============================
8076 * ~2200 changes, numerous bugfixes
8079 * The `for` loop syntax has changed to work with the `Iterator` trait.
8080 * At long last, unwinding works on Windows.
8081 * Default methods are ready for use.
8082 * Many trait inheritance bugs fixed.
8083 * Owned and borrowed trait objects work more reliably.
8084 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8085 * rustc can omit emission of code for the `debug!` macro if it is passed
8087 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8088 for foo.rs, then foo/mod.rs, and will generate an error when both are
8090 * Strings no longer contain trailing nulls. The new `std::c_str` module
8091 provides new mechanisms for converting to C strings.
8092 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8093 * The FFI has been overhauled such that foreign functions are called directly,
8094 instead of through a stack-switching wrapper.
8095 * Calling a foreign function must be done through a Rust function with the
8096 `#[fixed_stack_segment]` attribute.
8097 * The `externfn!` macro can be used to declare both a foreign function and
8098 a `#[fixed_stack_segment]` wrapper at once.
8099 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8100 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8101 * `priv` is disallowed everywhere except for struct fields and enum variants.
8102 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8103 * `ref` bindings in irrefutable patterns work correctly now.
8104 * `char` is now prevented from containing invalid code points.
8105 * Casting to `bool` is no longer allowed.
8106 * `\0` is now accepted as an escape in chars and strings.
8107 * `yield` is a reserved keyword.
8108 * `typeof` is a reserved keyword.
8109 * Crates may be imported by URL with `extern mod foo = "url";`.
8110 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8111 * Static vectors can be initialized with repeating elements,
8112 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8113 * Static structs can be initialized with functional record update,
8114 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8115 * `cfg!` can be used to conditionally execute code based on the crate
8116 configuration, similarly to `#[cfg(...)]`.
8117 * The `unnecessary_qualification` lint detects unneeded module
8118 prefixes (default: allow).
8119 * Arithmetic operations have been implemented on the SIMD types in
8120 `std::unstable::simd`.
8121 * Exchange allocation headers were removed, reducing memory usage.
8122 * `format!` implements a completely new, extensible, and higher-performance
8123 string formatting system. It will replace `fmt!`.
8124 * `print!` and `println!` write formatted strings (using the `format!`
8125 extension) to stdout.
8126 * `write!` and `writeln!` write formatted strings (using the `format!`
8127 extension) to the new Writers in `std::rt::io`.
8128 * The library section in which a function or static is placed may
8129 be specified with `#[link_section = "..."]`.
8130 * The `proto!` syntax extension for defining bounded message protocols
8132 * `macro_rules!` is hygienic for `let` declarations.
8133 * The `#[export_name]` attribute specifies the name of a symbol.
8134 * `unreachable!` can be used to indicate unreachable code, and fails
8138 * std: Transitioned to the new runtime, written in Rust.
8139 * std: Added an experimental I/O library, `rt::io`, based on the new
8141 * std: A new generic `range` function was added to the prelude, replacing
8142 `uint::range` and friends.
8143 * std: `range_rev` no longer exists. Since range is an iterator it can be
8144 reversed with `range(lo, hi).invert()`.
8145 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8146 renamed to `unwrap_or`.
8147 * std: The `iterator` module was renamed to `iter`.
8148 * std: Integral types now support the `checked_add`, `checked_sub`, and
8149 `checked_mul` operations for detecting overflow.
8150 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8152 * std: Methods are standardizing on conventions for casting methods:
8153 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8155 * std: The `CString` type in `c_str` provides new ways to convert to and
8157 * std: `DoubleEndedIterator` can yield elements in two directions.
8158 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8160 * std: `str::from_bytes` renamed to `str::from_utf8`.
8161 * std: `pop_opt` and `shift_opt` methods added to vectors.
8162 * std: The task-local data interface no longer uses @, and keys are
8163 no longer function pointers.
8164 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8165 * std: Added `SharedPort` to `comm`.
8166 * std: `Eq` has a default method for `ne`; only `eq` is required
8168 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8169 is required in implementations.
8170 * std: `is_utf8` performance is improved, impacting many string functions.
8171 * std: `os::MemoryMap` provides cross-platform mmap.
8172 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8173 are not 'in-bounds' are considered undefined.
8174 * std: Many freestanding functions in `vec` removed in favor of methods.
8175 * std: Many freestanding functions on scalar types removed in favor of
8177 * std: Many options to task builders were removed since they don't make
8178 sense in the new scheduler design.
8179 * std: More containers implement `FromIterator` so can be created by the
8181 * std: More complete atomic types in `unstable::atomics`.
8182 * std: `comm::PortSet` removed.
8183 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8184 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8185 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8186 default implementations.
8187 * std: Various `from_str` functions were removed in favor of a generic
8188 `from_str` which is available in the prelude.
8189 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8190 * extra: `dlist`, the doubly-linked list was modernized.
8191 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8192 * extra: Added `glob` module, replacing `std::os::glob`.
8193 * extra: `rope` was removed.
8194 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8195 * extra: `net`, and `timer` were removed. The experimental replacements
8196 are `std::rt::io::net` and `std::rt::io::timer`.
8197 * extra: Iterators implemented for `SmallIntMap`.
8198 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8199 * extra: `SmallIntSet` removed. Use `BitvSet`.
8200 * extra: Performance of JSON parsing greatly improved.
8201 * extra: `semver` updated to SemVer 2.0.0.
8202 * extra: `term` handles more terminals correctly.
8203 * extra: `dbg` module removed.
8204 * extra: `par` module removed.
8205 * extra: `future` was cleaned up, with some method renames.
8206 * extra: Most free functions in `getopts` were converted to methods.
8209 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8210 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8211 similarly to gcc's `--march` flag.
8212 * rustc's performance compiling small crates is much better.
8213 * rustpkg has received many improvements.
8214 * rustpkg supports git tags as package IDs.
8215 * rustpkg builds into target-specific directories so it can be used for
8217 * The number of concurrent test tasks is controlled by the environment
8218 variable RUST_TEST_TASKS.
8219 * The test harness can now report metrics for benchmarks.
8220 * All tools have man pages.
8221 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8222 * The runtime uses jemalloc for allocations.
8223 * Segmented stacks are temporarily disabled as part of the transition to
8224 the new runtime. Stack overflows are possible!
8225 * A new documentation backend, rustdoc_ng, is available for use. It is
8226 still invoked through the normal `rustdoc` command.
8229 Version 0.7 (2013-07-03)
8230 =======================
8232 * ~2000 changes, numerous bugfixes
8235 * `impl`s no longer accept a visibility qualifier. Put them on methods
8237 * The borrow checker has been rewritten with flow-sensitivity, fixing
8238 many bugs and inconveniences.
8239 * The `self` parameter no longer implicitly means `&'self self`,
8240 and can be explicitly marked with a lifetime.
8241 * Overloadable compound operators (`+=`, etc.) have been temporarily
8242 removed due to bugs.
8243 * The `for` loop protocol now requires `for`-iterators to return `bool`
8244 so they compose better.
8245 * The `Durable` trait is replaced with the `'static` bounds.
8246 * Trait default methods work more often.
8247 * Structs with the `#[packed]` attribute have byte alignment and
8248 no padding between fields.
8249 * Type parameters bound by `Copy` must now be copied explicitly with
8251 * It is now illegal to move out of a dereferenced unsafe pointer.
8252 * `Option<~T>` is now represented as a nullable pointer.
8253 * `@mut` does dynamic borrow checks correctly.
8254 * The `main` function is only detected at the topmost level of the crate.
8255 The `#[main]` attribute is still valid anywhere.
8256 * Struct fields may no longer be mutable. Use inherited mutability.
8257 * The `#[no_send]` attribute makes a type that would otherwise be
8259 * The `#[no_freeze]` attribute makes a type that would otherwise be
8261 * Unbounded recursion will abort the process after reaching the limit
8262 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8263 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8264 are never implicitly copyable.
8265 * `#[static_assert]` makes compile-time assertions about static bools.
8266 * At long last, 'argument modes' no longer exist.
8267 * The rarely used `use mod` statement no longer exists.
8270 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8272 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8273 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8275 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8276 and unsuffixed integer literals.
8279 * The `core` crate was renamed to `std`.
8280 * The `std` crate was renamed to `extra`.
8281 * More and improved documentation.
8282 * std: `iterator` module for external iterator objects.
8283 * Many old-style (internal, higher-order function) iterators replaced by
8284 implementations of `Iterator`.
8285 * std: Many old internal vector and string iterators,
8286 incl. `any`, `all`. removed.
8287 * std: The `finalize` method of `Drop` renamed to `drop`.
8288 * std: The `drop` method now takes `&mut self` instead of `&self`.
8289 * std: The prelude no longer re-exports any modules, only types and traits.
8290 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8291 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8292 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8293 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8294 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8295 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8296 * std: Many types implement `Clone`.
8297 * std: `path` type renamed to `Path`.
8298 * std: `mut` module and `Mut` type removed.
8299 * std: Many standalone functions removed in favor of methods and iterators
8300 in `vec`, `str`. In the future methods will also work as functions.
8301 * std: `reinterpret_cast` removed. Use `transmute`.
8302 * std: ascii string handling in `std::ascii`.
8303 * std: `Rand` is implemented for ~/@.
8304 * std: `run` module for spawning processes overhauled.
8305 * std: Various atomic types added to `unstable::atomic`.
8306 * std: Various types implement `Zero`.
8307 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8308 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8309 * std: Added `os::mkdir_recursive`.
8310 * std: Added `os::glob` function performs filesystems globs.
8311 * std: `FuzzyEq` renamed to `ApproxEq`.
8312 * std: `Map` now defines `pop` and `swap` methods.
8313 * std: `Cell` constructors converted to static methods.
8314 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8315 * extra: `flate` module moved from `std` to `extra`.
8316 * extra: `fileinput` module for iterating over a series of files.
8317 * extra: `Complex` number type and `complex` module.
8318 * extra: `Rational` number type and `rational` module.
8319 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8320 * extra: `term` uses terminfo now, is more correct.
8321 * extra: `arc` functions converted to methods.
8322 * extra: Implementation of fixed output size variations of SHA-2.
8325 * `unused_variables` lint mode for unused variables (default: warn).
8326 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8328 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8330 * `dead_assignment` lint mode for unread variables (default: warn).
8331 * `unnecessary_allocation` lint mode detects some heap allocations that are
8332 immediately borrowed so could be written without allocating (default: warn).
8333 * `missing_doc` lint mode (default: allow).
8334 * `unreachable_code` lint mode (default: warn).
8335 * The `rusti` command has been rewritten and a number of bugs addressed.
8336 * rustc outputs in color on more terminals.
8337 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8338 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8339 * Compiling with `-g` will make the binary record information about
8340 dynamic borrowcheck failures for debugging.
8341 * rustdoc has a nicer stylesheet.
8342 * Various improvements to rustdoc.
8343 * Improvements to rustpkg (see the detailed release notes).
8346 Version 0.6 (2013-04-03)
8347 ========================
8349 * ~2100 changes, numerous bugfixes
8352 * The self type parameter in traits is now spelled `Self`
8353 * The `self` parameter in trait and impl methods must now be explicitly
8354 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8355 * Static methods no longer require the `static` keyword and instead
8356 are distinguished by the lack of a `self` parameter
8357 * Replaced the `Durable` trait with the `'static` lifetime
8358 * The old closure type syntax with the trailing sigil has been
8359 removed in favor of the more consistent leading sigil
8360 * `super` is a keyword, and may be prefixed to paths
8361 * Trait bounds are separated with `+` instead of whitespace
8362 * Traits are implemented with `impl Trait for Type`
8363 instead of `impl Type: Trait`
8364 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8365 * The `export` keyword has finally been removed
8366 * The `move` keyword has been removed (see "Semantic changes")
8367 * The interior mutability qualifier on vectors, `[mut T]`, has been
8368 removed. Use `&mut [T]`, etc.
8369 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8370 * `fail` is no longer a keyword. Use `fail!()`
8371 * `assert` is no longer a keyword. Use `assert!()`
8372 * `log` is no longer a keyword. use `debug!`, etc.
8373 * 1-tuples may be represented as `(T,)`
8374 * Struct fields may no longer be `mut`. Use inherited mutability,
8375 `@mut T`, `core::mut` or `core::cell`
8376 * `extern mod { ... }` is no longer valid syntax for foreign
8377 function modules. Use extern blocks: `extern { ... }`
8378 * Newtype enums removed. Use tuple-structs.
8379 * Trait implementations no longer support visibility modifiers
8380 * Pattern matching over vectors improved and expanded
8381 * `const` renamed to `static` to correspond to lifetime name,
8382 and make room for future `static mut` unsafe mutable globals.
8383 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8384 * `Clone` implementations can be automatically generated with
8385 `#[deriving(Clone)]`
8386 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8387 instead of `foo as Bar`.
8388 * Fixed length vector types are now written as `[int, .. 3]`
8389 instead of `[int * 3]`.
8390 * Fixed length vector types can express the length as a constant
8391 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8394 * Types with owned pointers or custom destructors move by default,
8395 eliminating the `move` keyword
8396 * All foreign functions are considered unsafe
8397 * &mut is now unaliasable
8398 * Writes to borrowed @mut pointers are prevented dynamically
8400 * The name of the main function can be customized using #[main]
8401 * The default type of an inferred closure is &fn instead of @fn
8402 * `use` statements may no longer be "chained" - they cannot import
8403 identifiers imported by previous `use` statements
8404 * `use` statements are crate relative, importing from the "top"
8405 of the crate by default. Paths may be prefixed with `super::`
8406 or `self::` to change the search behavior.
8407 * Method visibility is inherited from the implementation declaration
8408 * Structural records have been removed
8409 * Many more types can be used in static items, including enums
8410 'static-lifetime pointers and vectors
8411 * Pattern matching over vectors improved and expanded
8412 * Typechecking of closure types has been overhauled to
8413 improve inference and eliminate unsoundness
8414 * Macros leave scope at the end of modules, unless that module is
8415 tagged with #[macro_escape]
8418 * Added big integers to `std::bigint`
8419 * Removed `core::oldcomm` module
8420 * Added pipe-based `core::comm` module
8421 * Numeric traits have been reorganized under `core::num`
8422 * `vec::slice` finally returns a slice
8423 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8424 * Containers reorganized around traits in `core::container`
8425 * `core::dvec` removed, `~[T]` is a drop-in replacement
8426 * `core::send_map` renamed to `core::hashmap`
8427 * `std::map` removed; replaced with `core::hashmap`
8428 * `std::treemap` reimplemented as an owned balanced tree
8429 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8430 * `core::trie` added as a fast ordered map for integer keys
8431 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8432 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8433 overload the comparison operators, whereas `TotalOrd` is used
8434 by certain container types
8437 * Replaced the 'cargo' package manager with 'rustpkg'
8438 * Added all-purpose 'rust' tool
8439 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8440 * rustc now *attempts* to offer spelling suggestions
8441 * Improved support for ARM and Android
8442 * Preliminary MIPS backend
8443 * Improved foreign function ABI implementation for x86, x86_64
8444 * Various memory usage improvements
8445 * Rust code may be embedded in foreign code under limited circumstances
8446 * Inline assembler supported by new asm!() syntax extension.
8449 Version 0.5 (2012-12-21)
8450 ===========================
8452 * ~900 changes, numerous bugfixes
8455 * Removed `<-` move operator
8456 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8457 * Removed old fixed length vector syntax - `[T]/N`
8458 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8459 * Macros may now expand to items and statements
8460 * `a.b()` is always parsed as a method call, never as a field projection
8461 * `Eq` and `IterBytes` implementations can be automatically generated
8462 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8463 * Removed the special crate language for `.rc` files
8464 * Function arguments may consist of any irrefutable pattern
8467 * `&` and `~` pointers may point to objects
8468 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8469 * Enum variants may be structs
8470 * Destructors can be added to all nominal types with the Drop trait
8471 * Structs and nullary enum variants may be constants
8472 * Values that cannot be implicitly copied are now automatically moved
8473 without writing `move` explicitly
8474 * `&T` may now be coerced to `*T`
8475 * Coercions happen in `let` statements as well as function calls
8476 * `use` statements now take crate-relative paths
8477 * The module and type namespaces have been merged so that static
8478 method names can be resolved under the trait in which they are
8481 * Improved support for language features
8482 * Trait inheritance works in many scenarios
8483 * More support for explicit self arguments in methods - `self`, `&self`
8484 `@self`, and `~self` all generally work as expected
8485 * Static methods work in more situations
8486 * Experimental: Traits may declare default methods for the implementations
8490 * New condition handling system in `core::condition`
8491 * Timsort added to `std::sort`
8492 * New priority queue, `std::priority_queue`
8493 * Pipes for serializable types, `std::flatpipes'
8494 * Serialization overhauled to be trait-based
8495 * Expanded `getopts` definitions
8496 * Moved futures to `std`
8497 * More functions are pure now
8498 * `core::comm` renamed to `oldcomm`. Still deprecated
8499 * `rustdoc` and `cargo` are libraries now
8502 * Added a preliminary REPL, `rusti`
8503 * License changed from MIT to dual MIT/APL2
8506 Version 0.4 (2012-10-15)
8507 ==========================
8509 * ~2000 changes, numerous bugfixes
8512 * All keywords are now strict and may not be used as identifiers anywhere
8513 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8514 'of', 'with', 'to', 'class'.
8515 * Classes are replaced with simpler structs
8516 * Explicit method self types
8517 * `ret` became `return` and `alt` became `match`
8518 * `import` is now `use`; `use is now `extern mod`
8519 * `extern mod { ... }` is now `extern { ... }`
8520 * `use mod` is the recommended way to import modules
8521 * `pub` and `priv` replace deprecated export lists
8522 * The syntax of `match` pattern arms now uses fat arrow (=>)
8523 * `main` no longer accepts an args vector; use `os::args` instead
8526 * Trait implementations are now coherent, ala Haskell typeclasses
8527 * Trait methods may be static
8528 * Argument modes are deprecated
8529 * Borrowed pointers are much more mature and recommended for use
8530 * Strings and vectors in the static region are stored in constant memory
8531 * Typestate was removed
8532 * Resolution rewritten to be more reliable
8533 * Support for 'dual-mode' data structures (freezing and thawing)
8536 * Most binary operators can now be overloaded via the traits in
8538 * `std::net::url` for representing URLs
8539 * Sendable hash maps in `core::send_map`
8540 * `core::task' gained a (currently unsafe) task-local storage API
8543 * An efficient new intertask communication primitive called the pipe,
8544 along with a number of higher-level channel types, in `core::pipes`
8545 * `std::arc`, an atomically reference counted, immutable, shared memory
8547 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8548 * Futures are now based on pipes and sendable
8549 * More robust linked task failure
8550 * Improved task builder API
8553 * Improved error reporting
8554 * Preliminary JIT support
8555 * Preliminary work on precise GC
8556 * Extensive architectural improvements to rustc
8557 * Begun a transition away from buggy C++-based reflection (shape) code to
8558 Rust-based (visitor) code
8559 * All hash functions and tables converted to secure, randomized SipHash
8562 Version 0.3 (2012-07-12)
8563 ========================
8565 * ~1900 changes, numerous bugfixes
8567 * New coding conveniences
8568 * Integer-literal suffix inference
8569 * Per-item control over warnings, errors
8570 * #[cfg(windows)] and #[cfg(unix)] attributes
8571 * Documentation comments
8572 * More compact closure syntax
8573 * 'do' expressions for treating higher-order functions as
8575 * *-patterns (wildcard extended to all constructor fields)
8578 * Name resolution pass and exhaustiveness checker rewritten
8579 * Region pointers and borrow checking supersede alias
8581 * Init-ness checking is now provided by a region-based liveness
8582 pass instead of the typestate pass; same for last-use analysis
8583 * Extensive work on region pointers
8585 * Experimental new language features
8586 * Slices and fixed-size, interior-allocated vectors
8587 * #!-comments for lang versioning, shell execution
8588 * Destructors and iface implementation for classes;
8589 type-parameterized classes and class methods
8590 * 'const' type kind for types that can be used to implement
8591 shared-memory concurrency patterns
8595 * Removal of various obsolete features
8596 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8597 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8599 * Constructs: do-while loops ('do' repurposed), fn binding,
8600 resources (replaced by destructors)
8602 * Compiler reorganization
8603 * Syntax-layer of compiler split into separate crate
8604 * Clang (from LLVM project) integrated into build
8605 * Typechecker split into sub-modules
8608 * New time functions
8609 * Extension methods for many built-in types
8610 * Arc: atomic-refcount read-only / exclusive-use shared cells
8611 * Par: parallel map and search routines
8612 * Extensive work on libuv interface
8613 * Much vector code moved to libraries
8614 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8615 #include, #include_str, #include_bin
8618 * Cargo automatically resolves dependencies
8621 Version 0.2 (2012-03-29)
8622 =========================
8624 * >1500 changes, numerous bugfixes
8626 * New docs and doc tooling
8628 * New port: FreeBSD x86_64
8630 * Compilation model enhancements
8631 * Generics now specialized, multiply instantiated
8632 * Functions now inlined across separate crates
8634 * Scheduling, stack and threading fixes
8635 * Noticeably improved message-passing performance
8636 * Explicit schedulers
8640 * Experimental new language features
8641 * Operator overloading
8645 * Various language extensions
8646 * C-callback function types: 'crust fn ...'
8647 * Infinite-loop construct: 'loop { ... }'
8648 * Shorten 'mutable' to 'mut'
8649 * Required mutable-local qualifier: 'let mut ...'
8650 * Basic glob-exporting: 'export foo::*;'
8651 * Alt now exhaustive, 'alt check' for runtime-checked
8652 * Block-function form of 'for' loop, with 'break' and 'ret'.
8655 * AST quasi-quote syntax extension
8656 * Revived libuv interface
8657 * New modules: core::{future, iter}, std::arena
8658 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8659 * Extensive cleanup, regularization in libstd, libcore
8662 Version 0.1 (2012-01-20)
8663 ===============================
8665 * Most language features work, including:
8666 * Unique pointers, unique closures, move semantics
8667 * Interface-constrained generics
8668 * Static interface dispatch
8670 * Multithread task scheduling
8671 * Typestate predicates
8672 * Failure unwinding, destructors
8673 * Pattern matching and destructuring assignment
8674 * Lightweight block-lambda syntax
8675 * Preliminary macro-by-example
8677 * Compiler works with the following configurations:
8678 * Linux: x86 and x86_64 hosts and targets
8679 * macOS: x86 and x86_64 hosts and targets
8680 * Windows: x86 hosts and targets
8682 * Cross compilation / multi-target configuration supported.
8684 * Preliminary API-documentation and package-management tools included.
8688 * Documentation is incomplete.
8690 * Performance is below intended target.
8692 * Standard library APIs are subject to extensive change, reorganization.
8694 * Language-level versioning is not yet operational - future code will