1 Version 1.42.0 (2020-03-12)
2 ==========================
6 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
7 that you can create an enum that has the exact layout and ABI of the type
9 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
11 fn foo(words: &[&str]) {
13 ["Hello", "World", "!", ..] => println!("Hello World!"),
14 ["Foo", "Bar", ..] => println!("Baz"),
15 rest => println!("{:?}", rest),
20 - [Merge `TraitItem` & `ImplItem into `AssocItem`][67131]
24 - [Added tier 3\* support for `armv7a-none-eabi`.][68253]
25 - [Added tier 3 support for `riscv64gc-unknown-linux-gnu`.][68037]
26 - [`Option::{expect,unwrap}` and
27 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
28 pointing to the location where they were called, rather than
29 `core`'s internals. ][67887]
33 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
34 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
35 to implement `Sized`.][67935]
36 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
37 - [`Layout::new` is now `const`.][66254]
38 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
45 - [`ManuallyDrop::take`]
47 - [`ptr::slice_from_raw_parts_mut`]
48 - [`ptr::slice_from_raw_parts`]
49 - [`wait_timeout_while`]
54 - [You no longer need to include `extern crate proc_macro;` to be able to
55 `use proc_macro;` in the `2018` edition.][cargo/7700]
59 - [`Error::description` has been deprecated, and its use will now produce a
60 warning.][66919] It's recommended to use `Display`/`to_string` instead.
62 [68253]: https://github.com/rust-lang/rust/pull/68253/
63 [68348]: https://github.com/rust-lang/rust/pull/68348/
64 [67935]: https://github.com/rust-lang/rust/pull/67935/
65 [68037]: https://github.com/rust-lang/rust/pull/68037/
66 [68122]: https://github.com/rust-lang/rust/pull/68122/
67 [67712]: https://github.com/rust-lang/rust/pull/67712/
68 [67887]: https://github.com/rust-lang/rust/pull/67887/
69 [67131]: https://github.com/rust-lang/rust/pull/67131/
70 [67233]: https://github.com/rust-lang/rust/pull/67233/
71 [66899]: https://github.com/rust-lang/rust/pull/66899/
72 [66919]: https://github.com/rust-lang/rust/pull/66919/
73 [66254]: https://github.com/rust-lang/rust/pull/66254/
74 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
75 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
76 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
77 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
78 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
79 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
80 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
81 [`wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
84 Version 1.41.0 (2020-01-30)
85 ===========================
90 - [You can now pass type parameters to foreign items when implementing
91 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
92 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
93 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
94 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
95 - [You can now use any valid identifier in a `format_args` macro.][66847]
96 Previously identifiers starting with an underscore were not allowed.
97 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
98 enum variants.][66183] These are still rejected semantically, but
99 can be seen and parsed by procedural macros and conditional compilation.
104 - [Rustc will now warn if you have unused loop `'label`s.][66325]
105 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
106 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
107 - [You can now pass an arguments file passing the `@path` syntax
108 to rustc.][66172] Note that the format differs somewhat from what is
109 found in other tooling; please see [the documentation][argfile-docs] for
111 - [You can now provide `--extern` flag without a path, indicating that it is
112 available from the search path or specified with an `-L` flag.][64882]
114 \* Refer to Rust's [platform support page][forge-platform-support] for more
115 information on Rust's tiered platform support.
117 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
122 - [The `core::panic` module is now stable.][66771] It was already stable
124 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
125 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
126 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
132 - [`Result::map_or_else`]
133 - [`std::rc::Weak::weak_count`]
134 - [`std::rc::Weak::strong_count`]
135 - [`std::sync::Weak::weak_count`]
136 - [`std::sync::Weak::strong_count`]
141 - [Cargo will now document all the private items for binary crates
142 by default.][cargo/7593]
143 - [`cargo-install` will now reinstall the package if it detects that it is out
144 of date.][cargo/7560]
145 - [Cargo.lock now uses a more git friendly format that should help to reduce
146 merge conflicts.][cargo/7579]
147 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
148 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
149 optimisation level to `2` for debug builds. You can also use
150 `[profile.<profile>.build-override]` to override build scripts and
156 - [You can now specify `edition` in documentation code blocks to compile the block
157 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
158 should be compiled the 2018 edition of Rust.
159 - [You can now provide custom themes to rustdoc with `--theme`, and check the
160 current theme with `--check-theme`.][54733]
161 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
166 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
167 Apple targets.][apple-32bit-drop] This means that the source code is still
168 available to build, but the targets are no longer being tested and release
169 binaries for those platforms will no longer be distributed by the Rust project.
170 Please refer to the linked blog post for more information.
172 [54733]: https://github.com/rust-lang/rust/pull/54733/
173 [61351]: https://github.com/rust-lang/rust/pull/61351/
174 [67255]: https://github.com/rust-lang/rust/pull/67255/
175 [66661]: https://github.com/rust-lang/rust/pull/66661/
176 [66771]: https://github.com/rust-lang/rust/pull/66771/
177 [66847]: https://github.com/rust-lang/rust/pull/66847/
178 [66238]: https://github.com/rust-lang/rust/pull/66238/
179 [66277]: https://github.com/rust-lang/rust/pull/66277/
180 [66325]: https://github.com/rust-lang/rust/pull/66325/
181 [66172]: https://github.com/rust-lang/rust/pull/66172/
182 [66183]: https://github.com/rust-lang/rust/pull/66183/
183 [65879]: https://github.com/rust-lang/rust/pull/65879/
184 [65013]: https://github.com/rust-lang/rust/pull/65013/
185 [64882]: https://github.com/rust-lang/rust/pull/64882/
186 [64325]: https://github.com/rust-lang/rust/pull/64325/
187 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
188 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
189 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
190 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
191 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
192 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
193 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
194 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
195 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
196 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
197 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
199 Version 1.40.0 (2019-12-19)
200 ===========================
204 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
205 `const` contexts.][65188] e.g.
208 pub struct Point(i32, i32);
210 const ORIGIN: Point = {
211 let constructor = Point;
217 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
218 indicate that there may be variants or fields added in the future.][64639]
219 For example this requires adding a wild-card branch (`_ => {}`) to any match
220 statements on a non-exhaustive `enum`. [(RFC 2008)]
221 - [You can now use function-like procedural macros in `extern` blocks and in
222 type positions.][63931] e.g. `type Generated = macro!();`
223 - [Function-like and attribute procedural macros can now emit
224 `macro_rules!` items, so you can now have your macros generate macros.][64035]
225 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
226 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
227 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
231 - [Added tier 3 support\* for the
232 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
233 - [Added tier 3 support for the
234 `aarch64-unknown-none-softfloat` target.][64589]
235 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
236 `mips64el-unknown-linux-muslabi64` targets.][65843]
238 \* Refer to Rust's [platform support page][forge-platform-support] for more
239 information on Rust's tiered platform support.
243 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
247 - [`BTreeMap::get_key_value`]
248 - [`HashMap::get_key_value`]
249 - [`Option::as_deref_mut`]
250 - [`Option::as_deref`]
251 - [`Option::flatten`]
252 - [`UdpSocket::peer_addr`]
253 - [`f32::to_be_bytes`]
254 - [`f32::to_le_bytes`]
255 - [`f32::to_ne_bytes`]
256 - [`f64::to_be_bytes`]
257 - [`f64::to_le_bytes`]
258 - [`f64::to_ne_bytes`]
259 - [`f32::from_be_bytes`]
260 - [`f32::from_le_bytes`]
261 - [`f32::from_ne_bytes`]
262 - [`f64::from_be_bytes`]
263 - [`f64::from_le_bytes`]
264 - [`f64::from_ne_bytes`]
271 - [Cargo will now always display warnings, rather than only on
272 fresh builds.][cargo/7450]
273 - [Feature flags (except `--all-features`) passed to a virtual workspace will
274 now produce an error.][cargo/7507] Previously these flags were ignored.
275 - [You can now publish `dev-dependencies` without including
276 a `version`.][cargo/7333]
280 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
281 when running documentation tests with `rustdoc`.][63803]
285 - [As previously announced, any previous NLL warnings in the 2015 edition are
286 now hard errors.][64221]
287 - [The `include!` macro will now warn if it failed to include the
288 entire file.][64284] The `include!` macro unintentionally only includes the
289 first _expression_ in a file, and this can be unintuitive. This will become
290 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
291 - [Using `#[inline]` on function prototypes and consts now emits a warning under
292 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
293 or `extern` blocks now correctly emits a hard error.
295 [65294]: https://github.com/rust-lang/rust/pull/65294/
296 [66103]: https://github.com/rust-lang/rust/pull/66103/
297 [65843]: https://github.com/rust-lang/rust/pull/65843/
298 [65188]: https://github.com/rust-lang/rust/pull/65188/
299 [65092]: https://github.com/rust-lang/rust/pull/65092/
300 [64589]: https://github.com/rust-lang/rust/pull/64589/
301 [64639]: https://github.com/rust-lang/rust/pull/64639/
302 [64221]: https://github.com/rust-lang/rust/pull/64221/
303 [64284]: https://github.com/rust-lang/rust/pull/64284/
304 [63931]: https://github.com/rust-lang/rust/pull/63931/
305 [64035]: https://github.com/rust-lang/rust/pull/64035/
306 [63674]: https://github.com/rust-lang/rust/pull/63674/
307 [63803]: https://github.com/rust-lang/rust/pull/63803/
308 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
309 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
310 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
311 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
312 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
313 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
314 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
315 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
316 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
317 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
318 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
319 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
320 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
321 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
322 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
323 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
324 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
325 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
326 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
327 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
328 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
329 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
330 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
331 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
332 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
333 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
336 Version 1.39.0 (2019-11-07)
337 ===========================
341 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
342 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
343 - [You can now use certain attributes on function, closure, and function pointer
344 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
345 `deny`, `forbid` as well as inert helper attributes used by procedural macro
346 attributes applied to items. e.g.
349 #[cfg(windows)] slice: &[u16],
350 #[cfg(not(windows))] slice: &[u8],
355 - [You can now take shared references to bind-by-move patterns in the `if` guards
356 of `match` arms.][63118] e.g.
359 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
363 // ---- `nums` is bound by move.
364 if nums.iter().sum::<u8>() == 10
365 // ^------ `.iter()` implicitly takes a reference to `nums`.
368 // ----------- Legal as `nums` was bound by move and so we have ownership.
379 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
380 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
381 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
382 **Note** Cargo currently doesn't use this feature. Refer to
383 [cargo#7315][cargo/7315] to track this feature's progress.
384 - [You can now pass `--show-output` argument to test binaries to print the
385 output of successful tests.][62600]
388 \* Refer to Rust's [platform support page][forge-platform-support] for more
389 information on Rust's tiered platform support.
393 - [`Vec::new` and `String::new` are now `const` functions.][64028]
394 - [`LinkedList::new` is now a `const` function.][63684]
395 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
396 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
401 - [`Pin::into_inner`]
402 - [`Instant::checked_duration_since`]
403 - [`Instant::saturating_duration_since`]
407 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
408 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
409 `--all` is now deprecated.
413 - [You can now pass `-Clinker` to rustdoc to control the linker used
414 for compiling doctests.][63834]
418 - [Code that was previously accepted by the old borrow checker, but rejected by
419 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
420 previously a warning, and will also become a hard error in the Rust 2015
421 edition in the 1.40.0 release.
422 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
423 run tests.][63827] This should improve performance when running a large
425 - [The `try!` macro will now issue a deprecation warning.][62672] It is
426 recommended to use the `?` operator instead.
427 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
430 [62600]: https://github.com/rust-lang/rust/pull/62600/
431 [62672]: https://github.com/rust-lang/rust/pull/62672/
432 [63118]: https://github.com/rust-lang/rust/pull/63118/
433 [63209]: https://github.com/rust-lang/rust/pull/63209/
434 [63402]: https://github.com/rust-lang/rust/pull/63402/
435 [63565]: https://github.com/rust-lang/rust/pull/63565/
436 [63595]: https://github.com/rust-lang/rust/pull/63595/
437 [63684]: https://github.com/rust-lang/rust/pull/63684/
438 [63698]: https://github.com/rust-lang/rust/pull/63698/
439 [63770]: https://github.com/rust-lang/rust/pull/63770/
440 [63786]: https://github.com/rust-lang/rust/pull/63786/
441 [63827]: https://github.com/rust-lang/rust/pull/63827/
442 [63834]: https://github.com/rust-lang/rust/pull/63834/
443 [63927]: https://github.com/rust-lang/rust/pull/63927/
444 [63933]: https://github.com/rust-lang/rust/pull/63933/
445 [63934]: https://github.com/rust-lang/rust/pull/63934/
446 [63938]: https://github.com/rust-lang/rust/pull/63938/
447 [63940]: https://github.com/rust-lang/rust/pull/63940/
448 [63941]: https://github.com/rust-lang/rust/pull/63941/
449 [63945]: https://github.com/rust-lang/rust/pull/63945/
450 [64010]: https://github.com/rust-lang/rust/pull/64010/
451 [64028]: https://github.com/rust-lang/rust/pull/64028/
452 [64334]: https://github.com/rust-lang/rust/pull/64334/
453 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
454 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
455 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
456 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
457 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
458 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
460 Version 1.38.0 (2019-09-26)
461 ==========================
465 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
466 - [The `#[deprecated]` attribute can now be used on macros.][62042]
470 - [Added pipelined compilation support to `rustc`.][62766] This will
471 improve compilation times in some cases. For further information please refer
472 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
473 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
474 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
475 `x86_64-uwp-windows-msvc` targets.][60260]
476 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
477 `armv7-unknown-linux-musleabi` targets.][63107]
478 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
479 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
481 \* Refer to Rust's [platform support page][forge-platform-support] for more
482 information on Rust's tiered platform support.
486 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
487 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
488 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
489 is available at `std::clone::Clone`). This also makes all built-in macros
490 available in `std`/`core` root. e.g. `std::include_bytes!`.
491 - [`str::Chars` now implements `Debug`.][63000]
492 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
493 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
494 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
495 - [Added euclidean remainder and division operations (`div_euclid`,
496 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
497 `overflowing`, and `wrapping` versions are available for all
499 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
501 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
505 - [`<*const T>::cast`]
507 - [`Duration::as_secs_f32`]
508 - [`Duration::as_secs_f64`]
509 - [`Duration::div_f32`]
510 - [`Duration::div_f64`]
511 - [`Duration::from_secs_f32`]
512 - [`Duration::from_secs_f64`]
513 - [`Duration::mul_f32`]
514 - [`Duration::mul_f64`]
519 - [Added pipelined compilation support to `cargo`.][cargo/7143]
520 - [You can now pass the `--features` option multiple times to enable
521 multiple features.][cargo/7084]
525 - [`rustc` will now warn about some incorrect uses of
526 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
530 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
532 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
533 issues][62896] with certain crates such as libc.
535 [60260]: https://github.com/rust-lang/rust/pull/60260/
536 [61457]: https://github.com/rust-lang/rust/pull/61457/
537 [61491]: https://github.com/rust-lang/rust/pull/61491/
538 [61884]: https://github.com/rust-lang/rust/pull/61884/
539 [61953]: https://github.com/rust-lang/rust/pull/61953/
540 [62042]: https://github.com/rust-lang/rust/pull/62042/
541 [62528]: https://github.com/rust-lang/rust/pull/62528/
542 [62583]: https://github.com/rust-lang/rust/pull/62583/
543 [62735]: https://github.com/rust-lang/rust/pull/62735/
544 [62766]: https://github.com/rust-lang/rust/pull/62766/
545 [62784]: https://github.com/rust-lang/rust/pull/62784/
546 [62785]: https://github.com/rust-lang/rust/issues/62785/
547 [62814]: https://github.com/rust-lang/rust/pull/62814/
548 [62896]: https://github.com/rust-lang/rust/issues/62896/
549 [63000]: https://github.com/rust-lang/rust/pull/63000/
550 [63056]: https://github.com/rust-lang/rust/pull/63056/
551 [63107]: https://github.com/rust-lang/rust/pull/63107/
552 [63346]: https://github.com/rust-lang/rust/pull/63346/
553 [63421]: https://github.com/rust-lang/rust/pull/63421/
554 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
555 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
556 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
557 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
558 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
559 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
560 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
561 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
562 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
563 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
564 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
565 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
566 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
567 [forge-platform-support]: https://forge.rust-lang.org/platform-support.html
568 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
570 Version 1.37.0 (2019-08-15)
571 ==========================
575 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
576 [`Box`][62228], or an [array][62235] and unused.
577 - [You can now use the `cfg` and `cfg_attr` attributes on
578 generic parameters.][61547]
579 - [You can now use enum variants through type alias.][61682] e.g. You can
582 type MyOption = Option<u8>;
584 fn increment_or_zero(x: MyOption) -> u8 {
586 MyOption::Some(y) => y + 1,
591 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
593 - [You can now use `#[repr(align(X)]` on enums.][61229]
594 - [The `?` Kleene macro operator is now available in the
595 2015 edition.][60932]
599 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
600 and `-C profile-use` flags.][61268] For more information on how to use profile
601 guided optimization, please refer to the [rustc book][rustc-book-pgo].
602 - [The `rust-lldb` wrapper script should now work again.][61827]
606 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
610 - [`BufReader::buffer`]
611 - [`BufWriter::buffer`]
613 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
614 - [`DoubleEndedIterator::nth_back`]
616 - [`Wrapping::reverse_bits`]
617 - [`i128::reverse_bits`]
618 - [`i16::reverse_bits`]
619 - [`i32::reverse_bits`]
620 - [`i64::reverse_bits`]
621 - [`i8::reverse_bits`]
622 - [`isize::reverse_bits`]
623 - [`slice::copy_within`]
624 - [`u128::reverse_bits`]
625 - [`u16::reverse_bits`]
626 - [`u32::reverse_bits`]
627 - [`u64::reverse_bits`]
628 - [`u8::reverse_bits`]
629 - [`usize::reverse_bits`]
633 - [`Cargo.lock` files are now included by default when publishing executable crates
634 with executables.][cargo/7026]
635 - [You can now specify `default-run="foo"` in `[package]` to specify the
636 default executable to use for `cargo run`.][cargo/7056]
643 - [Using `...` for inclusive range patterns will now warn by default.][61342]
644 Please transition your code to using the `..=` syntax for inclusive
646 - [Using a trait object without the `dyn` will now warn by default.][61203]
647 Please transition your code to use `dyn Trait` for trait objects instead.
649 [62228]: https://github.com/rust-lang/rust/pull/62228/
650 [62235]: https://github.com/rust-lang/rust/pull/62235/
651 [61802]: https://github.com/rust-lang/rust/pull/61802/
652 [61827]: https://github.com/rust-lang/rust/pull/61827/
653 [61547]: https://github.com/rust-lang/rust/pull/61547/
654 [61682]: https://github.com/rust-lang/rust/pull/61682/
655 [61268]: https://github.com/rust-lang/rust/pull/61268/
656 [61342]: https://github.com/rust-lang/rust/pull/61342/
657 [61347]: https://github.com/rust-lang/rust/pull/61347/
658 [61100]: https://github.com/rust-lang/rust/pull/61100/
659 [61203]: https://github.com/rust-lang/rust/pull/61203/
660 [61229]: https://github.com/rust-lang/rust/pull/61229/
661 [60932]: https://github.com/rust-lang/rust/pull/60932/
662 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
663 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
664 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
665 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
666 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
667 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
668 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
669 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
670 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
671 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
672 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
673 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
674 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
675 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
676 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
677 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
678 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
679 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
680 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
681 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
682 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
683 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
684 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
685 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
688 Version 1.36.0 (2019-07-04)
689 ==========================
693 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
694 - [The order of traits in trait objects no longer affects the semantics of that
695 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
696 `dyn fmt::Debug + Send`, where this was previously not the case.
700 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
701 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
702 - [`mem::needs_drop` is now available as a const fn.][60364]
703 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
704 - [`String` now implements `BorrowMut<str>`.][60404]
705 - [`io::Cursor` now implements `Default`.][60234]
706 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
707 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
708 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
709 environment has access to heap memory allocation.
710 - [`String` now implements `From<&String>`.][59825]
711 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
712 return a tuple of each argument when there is multiple arguments.
713 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
718 - [`VecDeque::rotate_left`]
719 - [`VecDeque::rotate_right`]
720 - [`Iterator::copied`]
723 - [`Read::read_vectored`]
724 - [`Write::write_vectored`]
725 - [`str::as_mut_ptr`]
726 - [`mem::MaybeUninit`]
727 - [`pointer::align_offset`]
731 - [`task::RawWakerVTable`]
737 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
738 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
740 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
744 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
751 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
752 longer recommended, and will be deprecated in 1.39.0.
754 [60318]: https://github.com/rust-lang/rust/pull/60318/
755 [60364]: https://github.com/rust-lang/rust/pull/60364/
756 [60370]: https://github.com/rust-lang/rust/pull/60370/
757 [60404]: https://github.com/rust-lang/rust/pull/60404/
758 [60234]: https://github.com/rust-lang/rust/pull/60234/
759 [60244]: https://github.com/rust-lang/rust/pull/60244/
760 [58623]: https://github.com/rust-lang/rust/pull/58623/
761 [59648]: https://github.com/rust-lang/rust/pull/59648/
762 [59675]: https://github.com/rust-lang/rust/pull/59675/
763 [59825]: https://github.com/rust-lang/rust/pull/59825/
764 [59826]: https://github.com/rust-lang/rust/pull/59826/
765 [59445]: https://github.com/rust-lang/rust/pull/59445/
766 [59114]: https://github.com/rust-lang/rust/pull/59114/
767 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
768 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
769 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
770 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
771 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
772 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
773 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
774 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
775 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
776 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
777 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
778 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
779 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
780 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
781 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
782 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
783 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
784 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
785 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
786 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
789 Version 1.35.0 (2019-05-23)
790 ==========================
794 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
795 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
796 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
798 unsafe fn call_unsafe(func: unsafe fn()) {
803 unsafe { call_unsafe(|| {}); }
810 - [Added the `armv6-unknown-freebsd-gnueabihf` and
811 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
812 - [Added the `wasm32-unknown-wasi` target.][59464]
817 - [`Thread` will now show its ID in `Debug` output.][59460]
818 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
819 - [`alloc::System` now implements `Default`.][59451]
820 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
822 - [`char::{ToLowercase, ToUppercase}` now
823 implement `ExactSizeIterator`.][58778]
824 - [All `NonZero` numeric types now implement `FromStr`.][58717]
825 - [Removed the `Read` trait bounds
826 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
827 - [You can now call the `dbg!` macro without any parameters to print the file
828 and line where it is called.][57847]
829 - [In place ASCII case conversions are now up to 4× faster.][59283]
830 e.g. `str::make_ascii_lowercase`
831 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
838 - [`RefCell::replace_with`]
839 - [`RefCell::map_split`]
841 - [`Range::contains`]
842 - [`RangeFrom::contains`]
843 - [`RangeTo::contains`]
844 - [`RangeInclusive::contains`]
845 - [`RangeToInclusive::contains`]
850 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
851 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
856 - [The Rust toolchain is now available natively for musl based distros.][58575]
858 [59460]: https://github.com/rust-lang/rust/pull/59460/
859 [59464]: https://github.com/rust-lang/rust/pull/59464/
860 [59500]: https://github.com/rust-lang/rust/pull/59500/
861 [59512]: https://github.com/rust-lang/rust/pull/59512/
862 [59580]: https://github.com/rust-lang/rust/pull/59580/
863 [59283]: https://github.com/rust-lang/rust/pull/59283/
864 [59451]: https://github.com/rust-lang/rust/pull/59451/
865 [59076]: https://github.com/rust-lang/rust/pull/59076/
866 [58778]: https://github.com/rust-lang/rust/pull/58778/
867 [58717]: https://github.com/rust-lang/rust/pull/58717/
868 [58369]: https://github.com/rust-lang/rust/pull/58369/
869 [58423]: https://github.com/rust-lang/rust/pull/58423/
870 [58080]: https://github.com/rust-lang/rust/pull/58080/
871 [57847]: https://github.com/rust-lang/rust/pull/57847/
872 [58575]: https://github.com/rust-lang/rust/pull/58575
873 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
874 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
875 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
876 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
877 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
878 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
879 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
880 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
881 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
882 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
883 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
884 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
886 Version 1.34.2 (2019-05-14)
887 ===========================
889 * [Destabilize the `Error::type_id` function due to a security
890 vulnerability][60785] ([CVE-2019-12083])
892 [60785]: https://github.com/rust-lang/rust/pull/60785
893 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
895 Version 1.34.1 (2019-04-25)
896 ===========================
898 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
899 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
900 * [Fix Clippy panic when checking some macros][clippy/3805]
902 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
903 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
904 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
906 Version 1.34.0 (2019-04-11)
907 ==========================
911 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
912 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
914 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
915 `#[attr{}]` procedural macros.][57367]
916 - [You can now write `extern crate self as foo;`][57407] to import your
917 crate's root into the extern prelude.
922 - [You can now target `riscv64imac-unknown-none-elf` and
923 `riscv64gc-unknown-none-elf`.][58406]
924 - [You can now enable linker plugin LTO optimisations with
925 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
926 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
928 - [You can now target `powerpc64-unknown-freebsd`.][57809]
933 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
934 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
935 the `Hash` trait to create an iterator.
936 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
937 methods.][58421] Most notably you no longer require the `Ord` trait to create
939 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
940 for all numeric types.][58044]
941 - [Indexing a `str` is now generic over all types that
942 implement `SliceIndex<str>`.][57604]
943 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
944 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
945 produce a warning if their returning type is unused.
946 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
947 `overflowing_pow` are now available for all numeric types.][57873] These are
948 equivalent to methods such as `wrapping_add` for the `pow` operation.
957 * [`atomic::AtomicI16`]
958 * [`atomic::AtomicI32`]
959 * [`atomic::AtomicI64`]
960 * [`atomic::AtomicI8`]
961 * [`atomic::AtomicU16`]
962 * [`atomic::AtomicU32`]
963 * [`atomic::AtomicU64`]
964 * [`atomic::AtomicU8`]
965 * [`convert::Infallible`]
966 * [`convert::TryFrom`]
967 * [`convert::TryInto`]
969 * [`iter::successors`]
970 * [`num::NonZeroI128`]
971 * [`num::NonZeroI16`]
972 * [`num::NonZeroI32`]
973 * [`num::NonZeroI64`]
975 * [`num::NonZeroIsize`]
976 * [`slice::sort_by_cached_key`]
977 * [`str::escape_debug`]
978 * [`str::escape_default`]
979 * [`str::escape_unicode`]
980 * [`str::split_ascii_whitespace`]
983 * [`Instant::checked_add`]
984 * [`Instant::checked_sub`]
985 * [`SystemTime::checked_add`]
986 * [`SystemTime::checked_sub`]
990 - [You can now use alternative registries to crates.io.][cargo/6654]
994 - [You can now use the `?` operator in your documentation tests without manually
995 adding `fn main() -> Result<(), _> {}`.][56470]
999 - [`Command::before_exec` is being replaced by the unsafe method
1000 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1001 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1002 can now use `const` functions in `static` variables.
1004 [58370]: https://github.com/rust-lang/rust/pull/58370/
1005 [58406]: https://github.com/rust-lang/rust/pull/58406/
1006 [58421]: https://github.com/rust-lang/rust/pull/58421/
1007 [58166]: https://github.com/rust-lang/rust/pull/58166/
1008 [58044]: https://github.com/rust-lang/rust/pull/58044/
1009 [58057]: https://github.com/rust-lang/rust/pull/58057/
1010 [58059]: https://github.com/rust-lang/rust/pull/58059/
1011 [57809]: https://github.com/rust-lang/rust/pull/57809/
1012 [57873]: https://github.com/rust-lang/rust/pull/57873/
1013 [57604]: https://github.com/rust-lang/rust/pull/57604/
1014 [57367]: https://github.com/rust-lang/rust/pull/57367/
1015 [57407]: https://github.com/rust-lang/rust/pull/57407/
1016 [57425]: https://github.com/rust-lang/rust/pull/57425/
1017 [57106]: https://github.com/rust-lang/rust/pull/57106/
1018 [56470]: https://github.com/rust-lang/rust/pull/56470/
1019 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1020 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1021 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1022 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1023 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1024 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1025 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1026 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1027 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1028 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1029 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1030 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1031 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1032 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1033 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1034 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1035 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1036 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1037 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1038 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1039 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1040 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1041 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1042 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1043 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1044 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1045 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1046 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1047 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1048 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1049 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1052 Version 1.33.0 (2019-02-28)
1053 ==========================
1057 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1058 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1059 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1060 E.g. You can have match statement on a `u8` that covers `0..=255` and
1061 you would no longer be required to have a `_ => unreachable!()` case.
1062 - [You can now have multiple patterns in `if let` and `while let`
1063 expressions.][57532] You can do this with the same syntax as a `match`
1073 let state = Creature::Crab("Ferris");
1075 if let Creature::Crab(name) | Creature::Person(name) = state {
1076 println!("This creature's name is: {}", name);
1080 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1081 this feature will by default produce a warning as this behaviour can be
1082 unintuitive. E.g. `if let _ = 5 {}`
1083 - [You can now use `let` bindings, assignments, expression statements,
1084 and irrefutable pattern destructuring in const functions.][57175]
1085 - [You can now call unsafe const functions.][57067] E.g.
1087 const unsafe fn foo() -> i32 { 5 }
1088 const fn bar() -> i32 {
1092 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1093 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1094 - [You can now specify a specific alignment with the `#[repr(packed)]`
1095 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1096 with an alignment of 2 bytes and a size of 6 bytes.
1097 - [You can now import an item from a module as an `_`.][56303] This allows you to
1098 import a trait's impls, and not have the name in the namespace. E.g.
1100 use std::io::Read as _;
1102 // Allowed as there is only one `Read` in the module.
1105 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1109 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1110 command line argument.][56351]
1111 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1112 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1113 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1114 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1115 information on Rust's platform support.
1116 - [Added support for the `thumbv7neon-linux-androideabi` and
1117 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1118 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1122 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1123 functions for all numeric types.][57566]
1124 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1125 are now `const` functions for all numeric types.][57105]
1126 - [The methods `is_positive` and `is_negative` are now `const` functions for
1127 all signed numeric types.][57105]
1128 - [The `get` method for all `NonZero` types is now `const`.][57167]
1129 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1130 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1131 numeric types.][57234]
1132 - [`Ipv4Addr::new` is now a `const` function][57234]
1136 - [`unix::FileExt::read_exact_at`]
1137 - [`unix::FileExt::write_all_at`]
1138 - [`Option::transpose`]
1139 - [`Result::transpose`]
1140 - [`convert::identity`]
1143 - [`marker::PhantomPinned`]
1144 - [`Vec::resize_with`]
1145 - [`VecDeque::resize_with`]
1146 - [`Duration::as_millis`]
1147 - [`Duration::as_micros`]
1148 - [`Duration::as_nanos`]
1153 - [You can now publish crates that require a feature flag to compile with
1154 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1155 - [Cargo should now rebuild a crate if a file was modified during the initial
1160 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1161 are now deprecated in the standard library, and their usage will now produce a warning.
1162 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1164 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1166 - [Libtest no longer creates a new thread for each test when
1167 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1169 [55982]: https://github.com/rust-lang/rust/pull/55982/
1170 [56243]: https://github.com/rust-lang/rust/pull/56243
1171 [56303]: https://github.com/rust-lang/rust/pull/56303/
1172 [56351]: https://github.com/rust-lang/rust/pull/56351/
1173 [56362]: https://github.com/rust-lang/rust/pull/56362
1174 [56642]: https://github.com/rust-lang/rust/pull/56642/
1175 [56769]: https://github.com/rust-lang/rust/pull/56769/
1176 [56805]: https://github.com/rust-lang/rust/pull/56805
1177 [56947]: https://github.com/rust-lang/rust/pull/56947/
1178 [57049]: https://github.com/rust-lang/rust/pull/57049/
1179 [57067]: https://github.com/rust-lang/rust/pull/57067/
1180 [57105]: https://github.com/rust-lang/rust/pull/57105
1181 [57130]: https://github.com/rust-lang/rust/pull/57130/
1182 [57167]: https://github.com/rust-lang/rust/pull/57167/
1183 [57175]: https://github.com/rust-lang/rust/pull/57175/
1184 [57234]: https://github.com/rust-lang/rust/pull/57234/
1185 [57332]: https://github.com/rust-lang/rust/pull/57332/
1186 [57465]: https://github.com/rust-lang/rust/pull/57465/
1187 [57532]: https://github.com/rust-lang/rust/pull/57532/
1188 [57535]: https://github.com/rust-lang/rust/pull/57535/
1189 [57566]: https://github.com/rust-lang/rust/pull/57566/
1190 [57615]: https://github.com/rust-lang/rust/pull/57615/
1191 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1192 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1193 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1194 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1195 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1196 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1197 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1198 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1199 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1200 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1201 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1202 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1203 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1204 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1205 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1206 [platform-support]: https://forge.rust-lang.org/platform-support.html
1208 Version 1.32.0 (2019-01-17)
1209 ==========================
1214 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1215 operator allows you to specify zero or one repetitions similar to the `*` and
1217 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1218 now always resolve to the item (`enum`, `struct`, etc.) available in the
1219 module if present, before resolving to a external crate or an item the prelude.][56759]
1222 enum Color { Red, Green, Blue }
1228 - [You can now match against `PhantomData<T>` types.][55837]
1229 - [You can now match against literals in macros with the `literal`
1230 specifier.][56072] This will match against a literal of any type.
1231 E.g. `1`, `'A'`, `"Hello World"`
1232 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1234 struct Point(i32, i32);
1237 pub fn new(x: i32, y: i32) -> Self {
1241 pub fn is_origin(&self) -> bool {
1249 - [Self can also now be used in type definitions.][56366] E.g.
1253 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1256 Cons(T, Box<Self>) // likewise here
1259 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1260 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1264 - [The default allocator has changed from jemalloc to the default allocator on
1265 your system.][55238] The compiler itself on Linux & macOS will still use
1266 jemalloc, but programs compiled with it will use the system allocator.
1267 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1271 - [`PathBuf` now implements `FromStr`.][55148]
1272 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1273 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1274 easily debug expressions in your rust program. E.g.
1277 let b = dbg!(a * 2) + 1;
1278 // ^-- prints: [src/main.rs:4] a * 2 = 4
1282 The following APIs are now `const` functions and can be used in a
1286 - [`UnsafeCell::get`]
1287 - [`char::is_ascii`]
1289 - [`ManuallyDrop::new`]
1290 - [`ManuallyDrop::into_inner`]
1291 - [`RangeInclusive::start`]
1292 - [`RangeInclusive::end`]
1293 - [`NonNull::as_ptr`]
1296 - [`Duration::as_secs`]
1297 - [`Duration::subsec_millis`]
1298 - [`Duration::subsec_micros`]
1299 - [`Duration::subsec_nanos`]
1301 - [`Ipv4Addr::is_unspecified`]
1303 - [`Ipv6Addr::octets`]
1307 - [`i8::to_be_bytes`]
1308 - [`i8::to_le_bytes`]
1309 - [`i8::to_ne_bytes`]
1310 - [`i8::from_be_bytes`]
1311 - [`i8::from_le_bytes`]
1312 - [`i8::from_ne_bytes`]
1313 - [`i16::to_be_bytes`]
1314 - [`i16::to_le_bytes`]
1315 - [`i16::to_ne_bytes`]
1316 - [`i16::from_be_bytes`]
1317 - [`i16::from_le_bytes`]
1318 - [`i16::from_ne_bytes`]
1319 - [`i32::to_be_bytes`]
1320 - [`i32::to_le_bytes`]
1321 - [`i32::to_ne_bytes`]
1322 - [`i32::from_be_bytes`]
1323 - [`i32::from_le_bytes`]
1324 - [`i32::from_ne_bytes`]
1325 - [`i64::to_be_bytes`]
1326 - [`i64::to_le_bytes`]
1327 - [`i64::to_ne_bytes`]
1328 - [`i64::from_be_bytes`]
1329 - [`i64::from_le_bytes`]
1330 - [`i64::from_ne_bytes`]
1331 - [`i128::to_be_bytes`]
1332 - [`i128::to_le_bytes`]
1333 - [`i128::to_ne_bytes`]
1334 - [`i128::from_be_bytes`]
1335 - [`i128::from_le_bytes`]
1336 - [`i128::from_ne_bytes`]
1337 - [`isize::to_be_bytes`]
1338 - [`isize::to_le_bytes`]
1339 - [`isize::to_ne_bytes`]
1340 - [`isize::from_be_bytes`]
1341 - [`isize::from_le_bytes`]
1342 - [`isize::from_ne_bytes`]
1343 - [`u8::to_be_bytes`]
1344 - [`u8::to_le_bytes`]
1345 - [`u8::to_ne_bytes`]
1346 - [`u8::from_be_bytes`]
1347 - [`u8::from_le_bytes`]
1348 - [`u8::from_ne_bytes`]
1349 - [`u16::to_be_bytes`]
1350 - [`u16::to_le_bytes`]
1351 - [`u16::to_ne_bytes`]
1352 - [`u16::from_be_bytes`]
1353 - [`u16::from_le_bytes`]
1354 - [`u16::from_ne_bytes`]
1355 - [`u32::to_be_bytes`]
1356 - [`u32::to_le_bytes`]
1357 - [`u32::to_ne_bytes`]
1358 - [`u32::from_be_bytes`]
1359 - [`u32::from_le_bytes`]
1360 - [`u32::from_ne_bytes`]
1361 - [`u64::to_be_bytes`]
1362 - [`u64::to_le_bytes`]
1363 - [`u64::to_ne_bytes`]
1364 - [`u64::from_be_bytes`]
1365 - [`u64::from_le_bytes`]
1366 - [`u64::from_ne_bytes`]
1367 - [`u128::to_be_bytes`]
1368 - [`u128::to_le_bytes`]
1369 - [`u128::to_ne_bytes`]
1370 - [`u128::from_be_bytes`]
1371 - [`u128::from_le_bytes`]
1372 - [`u128::from_ne_bytes`]
1373 - [`usize::to_be_bytes`]
1374 - [`usize::to_le_bytes`]
1375 - [`usize::to_ne_bytes`]
1376 - [`usize::from_be_bytes`]
1377 - [`usize::from_le_bytes`]
1378 - [`usize::from_ne_bytes`]
1382 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
1383 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
1387 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
1391 - [The argument types for AVX's
1392 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
1393 been changed from `*const` to `*mut` as the previous implementation
1397 [55148]: https://github.com/rust-lang/rust/pull/55148/
1398 [55238]: https://github.com/rust-lang/rust/pull/55238/
1399 [55280]: https://github.com/rust-lang/rust/pull/55280/
1400 [55610]: https://github.com/rust-lang/rust/pull/55610/
1401 [55663]: https://github.com/rust-lang/rust/pull/55663/
1402 [55702]: https://github.com/rust-lang/rust/pull/55702/
1403 [55837]: https://github.com/rust-lang/rust/pull/55837/
1404 [55843]: https://github.com/rust-lang/rust/pull/55843/
1405 [56072]: https://github.com/rust-lang/rust/pull/56072/
1406 [56245]: https://github.com/rust-lang/rust/pull/56245/
1407 [56365]: https://github.com/rust-lang/rust/pull/56365/
1408 [56366]: https://github.com/rust-lang/rust/pull/56366/
1409 [56395]: https://github.com/rust-lang/rust/pull/56395/
1410 [56759]: https://github.com/rust-lang/rust/pull/56759/
1411 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
1412 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
1413 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
1414 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
1415 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
1416 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
1417 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
1418 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
1419 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
1420 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
1421 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
1422 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
1423 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
1424 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
1425 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
1426 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
1427 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
1428 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
1429 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
1430 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
1431 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
1432 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
1433 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
1434 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
1435 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
1436 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
1437 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
1438 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
1439 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
1440 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
1441 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
1442 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
1443 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
1444 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
1445 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
1446 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
1447 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
1448 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
1449 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
1450 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
1451 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
1452 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
1453 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
1454 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
1455 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
1456 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
1457 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
1458 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
1459 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
1460 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
1461 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
1462 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
1463 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
1464 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
1465 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
1466 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
1467 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
1468 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
1469 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
1470 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
1471 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
1472 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
1473 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
1474 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
1475 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
1476 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
1477 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
1478 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
1479 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
1480 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
1481 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
1482 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
1483 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
1484 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
1485 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
1486 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
1487 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
1488 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
1489 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
1490 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
1491 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
1492 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
1493 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
1494 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
1495 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
1496 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
1497 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
1498 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
1499 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
1500 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
1501 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
1502 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
1503 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
1506 Version 1.31.1 (2018-12-20)
1507 ===========================
1509 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
1510 - [Fix broken go-to-definition in RLS][rls/1171]
1511 - [Fix infinite loop on hover in RLS][rls/1170]
1513 [56562]: https://github.com/rust-lang/rust/pull/56562
1514 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
1515 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
1517 Version 1.31.0 (2018-12-06)
1518 ==========================
1522 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
1523 - [New lifetime elision rules now allow for eliding lifetimes in functions and
1524 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
1525 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
1527 - [You can now define and use `const` functions.][54835] These are currently
1528 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
1529 [language reference][const-reference] for what exactly is available.
1530 - [You can now use tool lints, which allow you to scope lints from external
1531 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
1532 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
1533 a crate, not just in exported functions.][54451]
1534 - [You can now use parentheses in pattern matches.][54497]
1538 - [Updated musl to 1.1.20][54430]
1542 - [You can now convert `num::NonZero*` types to their raw equivalents using the
1543 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
1544 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
1545 into `Option<&mut T>` using the `From` trait.][53218]
1546 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
1551 - [`slice::align_to`]
1552 - [`slice::align_to_mut`]
1553 - [`slice::chunks_exact`]
1554 - [`slice::chunks_exact_mut`]
1555 - [`slice::rchunks`]
1556 - [`slice::rchunks_mut`]
1557 - [`slice::rchunks_exact`]
1558 - [`slice::rchunks_exact_mut`]
1559 - [`Option::replace`]
1563 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
1564 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
1565 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
1567 [52813]: https://github.com/rust-lang/rust/pull/52813/
1568 [53218]: https://github.com/rust-lang/rust/pull/53218/
1569 [53555]: https://github.com/rust-lang/rust/issues/53555/
1570 [54057]: https://github.com/rust-lang/rust/pull/54057/
1571 [54240]: https://github.com/rust-lang/rust/pull/54240/
1572 [54430]: https://github.com/rust-lang/rust/pull/54430/
1573 [54451]: https://github.com/rust-lang/rust/pull/54451/
1574 [54497]: https://github.com/rust-lang/rust/pull/54497/
1575 [54778]: https://github.com/rust-lang/rust/pull/54778/
1576 [54835]: https://github.com/rust-lang/rust/pull/54835/
1577 [54870]: https://github.com/rust-lang/rust/pull/54870/
1578 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
1579 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
1580 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
1581 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
1582 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
1583 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
1584 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1585 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
1586 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
1587 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
1588 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
1589 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
1590 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
1591 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
1593 Version 1.30.1 (2018-11-08)
1594 ===========================
1596 - [Fixed overflow ICE in rustdoc][54199]
1597 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
1599 [54199]: https://github.com/rust-lang/rust/pull/54199
1600 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
1602 Version 1.30.0 (2018-10-25)
1603 ==========================
1607 - [Procedural macros are now available.][52081] These kinds of macros allow for
1608 more powerful code generation. There is a [new chapter available][proc-macros]
1609 in the Rust Programming Language book that goes further in depth.
1610 - [You can now use keywords as identifiers using the raw identifiers
1611 syntax (`r#`),][53236] e.g. `let r#for = true;`
1612 - [Using anonymous parameters in traits is now deprecated with a warning and
1613 will be a hard error in the 2018 edition.][53272]
1614 - [You can now use `crate` in paths.][54404] This allows you to refer to the
1615 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
1616 - [Using a external crate no longer requires being prefixed with `::`.][54404]
1617 Previously, using a external crate in a module without a use statement
1618 required `let json = ::serde_json::from_str(foo);` but can now be written
1619 as `let json = serde_json::from_str(foo);`.
1620 - [You can now apply the `#[used]` attribute to static items to prevent the
1621 compiler from optimising them away, even if they appear to be unused,][51363]
1622 e.g. `#[used] static FOO: u32 = 1;`
1623 - [You can now import and reexport macros from other crates with the `use`
1624 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
1625 the root module of the crate. If your macro relies on calling other local
1626 macros, it is recommended to export with the
1627 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
1629 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
1630 using the `vis` specifier.][53370]
1631 - [Non-macro attributes now allow all forms of literals, not just
1632 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
1633 write `#[attr(true)]`.
1634 - [You can now specify a function to handle a panic in the Rust runtime with the
1635 `#[panic_handler]` attribute.][51366]
1639 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
1640 - [Added the `aarch64-unknown-netbsd` target][53165]
1644 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
1648 - [`Ipv4Addr::BROADCAST`]
1649 - [`Ipv4Addr::LOCALHOST`]
1650 - [`Ipv4Addr::UNSPECIFIED`]
1651 - [`Ipv6Addr::LOCALHOST`]
1652 - [`Ipv6Addr::UNSPECIFIED`]
1653 - [`Iterator::find_map`]
1655 The following methods are replacement methods for `trim_left`, `trim_right`,
1656 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
1658 - [`str::trim_end_matches`]
1660 - [`str::trim_start_matches`]
1661 - [`str::trim_start`]
1665 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
1666 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
1667 equivalent to calling `rustdoc --error-format=json`.
1668 - [Cargo will now provide a progress bar for builds.][cargo/5995]
1672 - [`rustdoc` allows you to specify what edition to treat your code as with the
1673 `--edition` option.][54057]
1674 - [`rustdoc` now has the `--color` (specify whether to output color) and
1675 `--error-format` (specify error format, e.g. `json`) options.][53003]
1676 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
1677 debug symbols.][53774]
1678 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
1679 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
1681 [50911]: https://github.com/rust-lang/rust/pull/50911/
1682 [51363]: https://github.com/rust-lang/rust/pull/51363/
1683 [51366]: https://github.com/rust-lang/rust/pull/51366/
1684 [52081]: https://github.com/rust-lang/rust/pull/52081/
1685 [53003]: https://github.com/rust-lang/rust/pull/53003/
1686 [53033]: https://github.com/rust-lang/rust/pull/53033/
1687 [53044]: https://github.com/rust-lang/rust/pull/53044/
1688 [53165]: https://github.com/rust-lang/rust/pull/53165/
1689 [53213]: https://github.com/rust-lang/rust/pull/53213/
1690 [53236]: https://github.com/rust-lang/rust/pull/53236/
1691 [53272]: https://github.com/rust-lang/rust/pull/53272/
1692 [53370]: https://github.com/rust-lang/rust/pull/53370/
1693 [53459]: https://github.com/rust-lang/rust/pull/53459/
1694 [53774]: https://github.com/rust-lang/rust/pull/53774/
1695 [53822]: https://github.com/rust-lang/rust/pull/53822/
1696 [54057]: https://github.com/rust-lang/rust/pull/54057/
1697 [54146]: https://github.com/rust-lang/rust/pull/54146/
1698 [54404]: https://github.com/rust-lang/rust/pull/54404/
1699 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
1700 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
1701 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
1702 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
1704 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
1705 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
1706 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
1707 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
1708 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
1709 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
1710 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
1711 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
1712 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
1713 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
1716 Version 1.29.2 (2018-10-11)
1717 ===========================
1719 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
1720 - The `rls-preview` component on the windows-gnu targets has been restored.
1722 [54639]: https://github.com/rust-lang/rust/pull/54639
1725 Version 1.29.1 (2018-09-25)
1726 ===========================
1731 - The standard library's `str::repeat` function contained an out of bounds write
1732 caused by an integer overflow. This has been fixed by deterministically
1733 panicking when an overflow happens.
1735 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
1739 Version 1.29.0 (2018-09-13)
1740 ==========================
1744 - [Bumped minimum LLVM version to 5.0.][51899]
1745 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
1746 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
1750 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
1751 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
1752 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
1753 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
1755 - [`Cell<T>` now allows `T` to be unsized.][50494]
1756 - [`SocketAddr` is now stable on Redox.][52656]
1761 - [`Iterator::flatten`]
1766 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
1767 `--locked` to disable this behavior.
1768 - [`cargo-install` will now allow you to cross compile an install
1769 using `--target`.][cargo/5614]
1770 - [Added the `cargo-fix` subcommand to automatically move project code from
1771 2015 edition to 2018.][cargo/5723]
1772 - [`cargo doc` can now optionally document private types using the
1773 `--document-private-items` flag.][cargo/5543]
1777 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
1778 the specified level to that level.][52354] For example `--cap-lints warn`
1779 will demote `deny` and `forbid` lints to `warn`.
1780 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
1781 fails and `101` if there is a panic.][52197]
1782 - [A preview of clippy has been made available through rustup.][51122]
1783 You can install the preview with `rustup component add clippy-preview`.
1787 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
1788 Use `str::get_unchecked(begin..end)` instead.
1789 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
1790 Consider using the `home_dir` function from
1791 https://crates.io/crates/dirs instead.
1792 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
1793 - [`cfg` attributes and `--cfg` command line flags are now more
1794 strictly validated.][53893]
1796 [53893]: https://github.com/rust-lang/rust/pull/53893/
1797 [52861]: https://github.com/rust-lang/rust/pull/52861/
1798 [52656]: https://github.com/rust-lang/rust/pull/52656/
1799 [52239]: https://github.com/rust-lang/rust/pull/52239/
1800 [52330]: https://github.com/rust-lang/rust/pull/52330/
1801 [52354]: https://github.com/rust-lang/rust/pull/52354/
1802 [52402]: https://github.com/rust-lang/rust/pull/52402/
1803 [52103]: https://github.com/rust-lang/rust/pull/52103/
1804 [52197]: https://github.com/rust-lang/rust/pull/52197/
1805 [51807]: https://github.com/rust-lang/rust/pull/51807/
1806 [51899]: https://github.com/rust-lang/rust/pull/51899/
1807 [51912]: https://github.com/rust-lang/rust/pull/51912/
1808 [51511]: https://github.com/rust-lang/rust/pull/51511/
1809 [51619]: https://github.com/rust-lang/rust/pull/51619/
1810 [51656]: https://github.com/rust-lang/rust/pull/51656/
1811 [51178]: https://github.com/rust-lang/rust/pull/51178/
1812 [51122]: https://github.com/rust-lang/rust/pull/51122
1813 [50494]: https://github.com/rust-lang/rust/pull/50494/
1814 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
1815 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
1816 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
1817 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
1818 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
1819 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
1820 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
1823 Version 1.28.0 (2018-08-02)
1824 ===========================
1828 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
1829 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
1830 the inner type across Foreign Function Interface (FFI) boundaries.
1831 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
1832 and can now be used as identifiers.][51196]
1833 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
1834 stable.][51241] This will allow users to specify a global allocator for
1836 - [Unit test functions marked with the `#[test]` attribute can now return
1837 `Result<(), E: Debug>` in addition to `()`.][51298]
1838 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
1839 allows macros to easily target lifetimes.
1843 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
1844 prioritise making smaller binary sizes. `z` is the same as `s` with the
1845 exception that it does not vectorise loops, which typically results in an even
1847 - [The short error format is now stable.][49546] Specified with
1848 `--error-format=short` this option will provide a more compressed output of
1849 rust error messages.
1850 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
1851 - [Reduced the number of allocations in the macro parser.][50855] This can
1852 improve compile times of macro heavy crates on average by 5%.
1856 - [Implemented `Default` for `&mut str`.][51306]
1857 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
1858 - [Implemented `Extend` for `()`.][50234]
1859 - [The `Debug` implementation of `time::Duration` should now be more easily
1860 human readable.][50364] Previously a `Duration` of one second would printed as
1861 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
1862 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
1863 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
1864 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
1865 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
1866 for `PathBuf`.][50170]
1867 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
1868 and `Wrapping<i128>`.][50465]
1869 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
1870 possible.][51050] This can provide up to a 40% speed increase.
1871 - [Improved error messages when using `format!`.][50610]
1875 - [`Iterator::step_by`]
1876 - [`Path::ancestors`]
1877 - [`SystemTime::UNIX_EPOCH`]
1878 - [`alloc::GlobalAlloc`]
1880 - [`alloc::LayoutErr`]
1883 - [`alloc::alloc_zeroed`]
1884 - [`alloc::dealloc`]
1885 - [`alloc::realloc`]
1886 - [`alloc::handle_alloc_error`]
1887 - [`btree_map::Entry::or_default`]
1888 - [`fmt::Alignment`]
1889 - [`hash_map::Entry::or_default`]
1890 - [`iter::repeat_with`]
1891 - [`num::NonZeroUsize`]
1892 - [`num::NonZeroU128`]
1893 - [`num::NonZeroU16`]
1894 - [`num::NonZeroU32`]
1895 - [`num::NonZeroU64`]
1896 - [`num::NonZeroU8`]
1897 - [`ops::RangeBounds`]
1898 - [`slice::SliceIndex`]
1899 - [`slice::from_mut`]
1900 - [`slice::from_ref`]
1901 - [`{Any + Send + Sync}::downcast_mut`]
1902 - [`{Any + Send + Sync}::downcast_ref`]
1903 - [`{Any + Send + Sync}::is`]
1907 - [Cargo will now no longer allow you to publish crates with build scripts that
1908 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
1909 considered to be immutable.
1913 - [The `suggestion_applicability` field in `rustc`'s json output is now
1914 stable.][50486] This will allow dev tools to check whether a code suggestion
1915 would apply to them.
1919 - [Rust will consider trait objects with duplicated constraints to be the same
1920 type as without the duplicated constraint.][51276] For example the below code will
1921 now fail to compile.
1926 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
1929 impl Trait + Send + Send {
1930 fn test(&self) { println!("two"); }
1934 [49546]: https://github.com/rust-lang/rust/pull/49546/
1935 [50143]: https://github.com/rust-lang/rust/pull/50143/
1936 [50170]: https://github.com/rust-lang/rust/pull/50170/
1937 [50234]: https://github.com/rust-lang/rust/pull/50234/
1938 [50265]: https://github.com/rust-lang/rust/pull/50265/
1939 [50364]: https://github.com/rust-lang/rust/pull/50364/
1940 [50385]: https://github.com/rust-lang/rust/pull/50385/
1941 [50465]: https://github.com/rust-lang/rust/pull/50465/
1942 [50486]: https://github.com/rust-lang/rust/pull/50486/
1943 [50554]: https://github.com/rust-lang/rust/pull/50554/
1944 [50610]: https://github.com/rust-lang/rust/pull/50610/
1945 [50855]: https://github.com/rust-lang/rust/pull/50855/
1946 [51050]: https://github.com/rust-lang/rust/pull/51050/
1947 [51196]: https://github.com/rust-lang/rust/pull/51196/
1948 [51200]: https://github.com/rust-lang/rust/pull/51200/
1949 [51241]: https://github.com/rust-lang/rust/pull/51241/
1950 [51276]: https://github.com/rust-lang/rust/pull/51276/
1951 [51298]: https://github.com/rust-lang/rust/pull/51298/
1952 [51306]: https://github.com/rust-lang/rust/pull/51306/
1953 [51562]: https://github.com/rust-lang/rust/pull/51562/
1954 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
1955 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
1956 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
1957 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
1958 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
1959 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
1960 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
1961 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
1962 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
1963 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
1964 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
1965 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
1966 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
1967 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
1968 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
1969 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
1970 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
1971 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
1972 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
1973 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
1974 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
1975 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
1976 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
1977 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
1978 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
1979 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
1980 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
1981 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
1982 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
1983 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
1985 Version 1.27.2 (2018-07-20)
1986 ===========================
1991 - The borrow checker was fixed to avoid potential unsoundness when using
1992 match ergonomics: [#52213][52213].
1994 [52213]: https://github.com/rust-lang/rust/issues/52213
1996 Version 1.27.1 (2018-07-10)
1997 ===========================
2002 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2003 when running, which enabled executing code as some other user on a
2004 given machine. This release fixes that vulnerability; you can read
2005 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2007 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2012 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2013 match ergonomics: [#51415][51415], [#49534][49534].
2015 [51415]: https://github.com/rust-lang/rust/issues/51415
2016 [49534]: https://github.com/rust-lang/rust/issues/49534
2017 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2018 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2020 Version 1.27.0 (2018-06-21)
2021 ==========================
2025 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2026 be used as an identifier.
2027 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2028 bare `Trait` syntax, and should make it clearer when being used in tandem with
2029 `impl Trait` because it is equivalent to the following syntax:
2030 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2031 `Box<Trait> == Box<dyn Trait>`.
2032 - [Attributes on generic parameters such as types and lifetimes are
2033 now stable.][48851] e.g.
2034 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2035 - [The `#[must_use]` attribute can now also be used on functions as well as
2036 types.][48925] It provides a lint that by default warns users when the
2037 value returned by a function has not been used.
2041 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2045 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2046 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2047 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2048 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2049 the `cfg` attribute.
2050 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2051 std are now available in core.][49896]
2052 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2054 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2055 that the operation isn't done in place.
2056 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2057 the `#[must_use]` attribute][49533] to warn about unused potentially
2058 expensive allocations.
2062 - [`DoubleEndedIterator::rfind`]
2063 - [`DoubleEndedIterator::rfold`]
2064 - [`DoubleEndedIterator::try_rfold`]
2065 - [`Duration::from_micros`]
2066 - [`Duration::from_nanos`]
2067 - [`Duration::subsec_micros`]
2068 - [`Duration::subsec_millis`]
2069 - [`HashMap::remove_entry`]
2070 - [`Iterator::try_fold`]
2071 - [`Iterator::try_for_each`]
2073 - [`Option::filter`]
2074 - [`String::replace_range`]
2075 - [`Take::set_limit`]
2076 - [`hint::unreachable_unchecked`]
2077 - [`os::unix::process::parent_id`]
2078 - [`ptr::swap_nonoverlapping`]
2079 - [`slice::rsplit_mut`]
2081 - [`slice::swap_with_slice`]
2085 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2086 `readme`, and `repository` fields.][cargo/5386]
2087 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2088 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2089 a different directory than `target` for placing compilation artifacts.
2090 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2091 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2092 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2093 where cargo would infer a binary, Cargo will produce a warning. You can
2094 disable this feature ahead of time by setting any of the following to false:
2095 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2096 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2097 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2101 - [Added “The Rustc book” into the official documentation.][49707]
2102 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2103 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2107 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2108 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2109 compile, `"".is_empty()` will still compile.
2110 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2111 will only print the inner type.][48553] E.g.
2112 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2113 not `AtomicBool(true)`.
2114 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2115 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2116 alignment should cover all use cases.
2117 - The `.description()` method on the `std::error::Error` trait
2118 [has been soft-deprecated][50163]. It is no longer required to implement it.
2120 [48553]: https://github.com/rust-lang/rust/pull/48553/
2121 [48851]: https://github.com/rust-lang/rust/pull/48851/
2122 [48925]: https://github.com/rust-lang/rust/pull/48925/
2123 [49533]: https://github.com/rust-lang/rust/pull/49533/
2124 [49623]: https://github.com/rust-lang/rust/pull/49623/
2125 [49630]: https://github.com/rust-lang/rust/pull/49630/
2126 [49664]: https://github.com/rust-lang/rust/pull/49664/
2127 [49699]: https://github.com/rust-lang/rust/pull/49699/
2128 [49707]: https://github.com/rust-lang/rust/pull/49707/
2129 [49719]: https://github.com/rust-lang/rust/pull/49719/
2130 [49896]: https://github.com/rust-lang/rust/pull/49896/
2131 [49968]: https://github.com/rust-lang/rust/pull/49968/
2132 [50163]: https://github.com/rust-lang/rust/pull/50163
2133 [50177]: https://github.com/rust-lang/rust/pull/50177/
2134 [50378]: https://github.com/rust-lang/rust/pull/50378/
2135 [50398]: https://github.com/rust-lang/rust/pull/50398/
2136 [50423]: https://github.com/rust-lang/rust/pull/50423/
2137 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2138 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2139 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2140 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2141 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2142 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2143 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2144 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2145 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2146 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2147 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2148 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2149 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2150 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2151 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2152 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2153 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2154 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2155 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2156 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2157 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2158 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2159 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2160 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2161 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2162 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2163 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2164 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2165 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2166 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2169 Version 1.26.2 (2018-06-05)
2170 ==========================
2175 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2177 [51117]: https://github.com/rust-lang/rust/issues/51117
2180 Version 1.26.1 (2018-05-29)
2181 ==========================
2186 - [RLS now works on Windows.][50646]
2187 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2193 - [`fn main() -> impl Trait` no longer works for non-Termination
2195 This reverts an accidental stabilization.
2196 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2197 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2199 [50646]: https://github.com/rust-lang/rust/issues/50646
2200 [50656]: https://github.com/rust-lang/rust/pull/50656
2201 [50812]: https://github.com/rust-lang/rust/pull/50812
2202 [50950]: https://github.com/rust-lang/rust/issues/50950
2203 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2205 Version 1.26.0 (2018-05-10)
2206 ==========================
2210 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2211 implement either or both traits.][49299]
2212 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2213 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2214 lifetime can be elided.][49458]
2215 - [`impl Trait` is now stable allowing you to have abstract types in returns
2216 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2217 `fn open(path: impl AsRef<Path>)`.
2218 - [Pattern matching will now automatically apply dereferences.][49394]
2219 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2220 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2221 - [A lot of operations are now available in a const context.][46882] E.g. You
2222 can now index into constant arrays, reference and dereference into constants,
2223 and use tuple struct constructors.
2224 - [Fixed entry slice patterns are now stable.][48516] E.g.
2226 let points = [1, 2, 3, 4];
2228 [1, 2, 3, 4] => println!("All points were sequential."),
2229 _ => println!("Not all points were sequential."),
2236 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2237 - [Fixed exponential projection complexity on nested types.][48296]
2238 This can provide up to a ~12% reduction in compile times for certain crates.
2239 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2240 to remap path prefixes outputted by the compiler.
2241 - [Added `powerpc-unknown-netbsd` target.][48281]
2245 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2246 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2247 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2248 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2249 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2250 - [`ascii::escape_default` is now available in libcore.][48735]
2251 - [Trailing commas are now supported in std and core macros.][48056]
2252 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2253 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2258 - [`*const T::copy_to_nonoverlapping`]
2259 - [`*const T::copy_to`]
2260 - [`*const T::read_unaligned`]
2261 - [`*const T::read_volatile`]
2262 - [`*const T::read`]
2264 - [`*const T::wrapping_add`]
2265 - [`*const T::wrapping_sub`]
2267 - [`*mut T::copy_to_nonoverlapping`]
2268 - [`*mut T::copy_to`]
2269 - [`*mut T::read_unaligned`]
2270 - [`*mut T::read_volatile`]
2272 - [`*mut T::replace`]
2275 - [`*mut T::wrapping_add`]
2276 - [`*mut T::wrapping_sub`]
2277 - [`*mut T::write_bytes`]
2278 - [`*mut T::write_unaligned`]
2279 - [`*mut T::write_volatile`]
2282 - [`FromUtf8Error::as_bytes`]
2283 - [`LocalKey::try_with`]
2284 - [`Option::cloned`]
2285 - [`btree_map::Entry::and_modify`]
2286 - [`fs::read_to_string`]
2289 - [`hash_map::Entry::and_modify`]
2290 - [`iter::FusedIterator`]
2291 - [`ops::RangeInclusive`]
2292 - [`ops::RangeToInclusive`]
2294 - [`slice::rotate_left`]
2295 - [`slice::rotate_right`]
2296 - [`String::retain`]
2301 - [Cargo will now output path to custom commands when `-v` is
2302 passed with `--list`][cargo/5041]
2303 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2307 - [The second edition of "The Rust Programming Language" book is now recommended
2308 over the first.][48404]
2313 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2314 syntax is now invalid.
2316 use std::ops::Fn as dyn;
2317 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2319 - [The result of dereferences are no longer promoted to `'static`.][47408]
2323 const PAIR: &(i32, i32) = &(0, 1);
2324 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2327 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2328 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2330 - [Removed hoedown from rustdoc.][48274]
2331 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2333 [46882]: https://github.com/rust-lang/rust/pull/46882
2334 [47379]: https://github.com/rust-lang/rust/pull/47379
2335 [47408]: https://github.com/rust-lang/rust/pull/47408
2336 [47813]: https://github.com/rust-lang/rust/pull/47813
2337 [48056]: https://github.com/rust-lang/rust/pull/48056
2338 [48125]: https://github.com/rust-lang/rust/pull/48125
2339 [48166]: https://github.com/rust-lang/rust/pull/48166
2340 [48235]: https://github.com/rust-lang/rust/pull/48235
2341 [48274]: https://github.com/rust-lang/rust/pull/48274
2342 [48281]: https://github.com/rust-lang/rust/pull/48281
2343 [48296]: https://github.com/rust-lang/rust/pull/48296
2344 [48326]: https://github.com/rust-lang/rust/pull/48326
2345 [48359]: https://github.com/rust-lang/rust/pull/48359
2346 [48404]: https://github.com/rust-lang/rust/pull/48404
2347 [48481]: https://github.com/rust-lang/rust/pull/48481
2348 [48516]: https://github.com/rust-lang/rust/pull/48516
2349 [48628]: https://github.com/rust-lang/rust/pull/48628
2350 [48629]: https://github.com/rust-lang/rust/pull/48629
2351 [48657]: https://github.com/rust-lang/rust/pull/48657
2352 [48735]: https://github.com/rust-lang/rust/pull/48735
2353 [48978]: https://github.com/rust-lang/rust/pull/48978
2354 [49101]: https://github.com/rust-lang/rust/pull/49101
2355 [49109]: https://github.com/rust-lang/rust/pull/49109
2356 [49121]: https://github.com/rust-lang/rust/pull/49121
2357 [49162]: https://github.com/rust-lang/rust/pull/49162
2358 [49184]: https://github.com/rust-lang/rust/pull/49184
2359 [49234]: https://github.com/rust-lang/rust/pull/49234
2360 [49255]: https://github.com/rust-lang/rust/pull/49255
2361 [49299]: https://github.com/rust-lang/rust/pull/49299
2362 [49305]: https://github.com/rust-lang/rust/pull/49305
2363 [49394]: https://github.com/rust-lang/rust/pull/49394
2364 [49458]: https://github.com/rust-lang/rust/pull/49458
2365 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
2366 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
2367 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
2368 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
2369 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
2370 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
2371 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
2372 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
2373 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
2374 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
2375 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
2376 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
2377 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
2378 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
2379 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
2380 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
2381 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
2382 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
2383 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
2384 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
2385 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
2386 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
2387 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
2388 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
2389 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
2390 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
2391 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
2392 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
2393 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
2394 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
2395 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
2396 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
2397 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
2398 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
2399 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
2400 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
2401 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2402 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
2403 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
2404 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
2405 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
2406 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
2409 Version 1.25.0 (2018-03-29)
2410 ==========================
2414 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
2415 - [You can now use nested groups of imports.][47948]
2416 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
2417 - [You can now have `|` at the start of a match arm.][47947] e.g.
2419 enum Foo { A, B, C }
2425 | Foo::B => println!("AB"),
2426 | Foo::C => println!("C"),
2433 - [Upgraded to LLVM 6.][47828]
2434 - [Added `-C lto=val` option.][47521]
2435 - [Added `i586-unknown-linux-musl` target][47282]
2439 - [Impl Send for `process::Command` on Unix.][47760]
2440 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
2441 - [`UnsafeCell::into_inner` is now safe.][47204]
2442 - [Implement libstd for CloudABI.][47268]
2443 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
2444 - [Implement `AsRef<Path>` for Component][46985]
2445 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
2446 - [Moved `Duration` to libcore.][46666]
2450 - [`Location::column`]
2453 The following functions can now be used in a constant expression.
2454 eg. `static MINUTE: Duration = Duration::from_secs(60);`
2455 - [`Duration::new`][47300]
2456 - [`Duration::from_secs`][47300]
2457 - [`Duration::from_millis`][47300]
2461 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
2462 - [`cargo new` now defaults to creating a binary crate, instead of a
2463 library crate.][cargo/5029]
2467 - [Rust by example is now shipped with new releases][46196]
2471 - [Deprecated `net::lookup_host`.][47510]
2472 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
2473 - The borrow checker was sometimes incorrectly permitting overlapping borrows
2474 around indexing operations (see [#47349][47349]). This has been fixed (which also
2475 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
2476 - [Removed deprecated unstable attribute `#[simd]`.][47251]
2478 [33903]: https://github.com/rust-lang/rust/pull/33903
2479 [47947]: https://github.com/rust-lang/rust/pull/47947
2480 [47948]: https://github.com/rust-lang/rust/pull/47948
2481 [47760]: https://github.com/rust-lang/rust/pull/47760
2482 [47790]: https://github.com/rust-lang/rust/pull/47790
2483 [47828]: https://github.com/rust-lang/rust/pull/47828
2484 [47398]: https://github.com/rust-lang/rust/pull/47398
2485 [47510]: https://github.com/rust-lang/rust/pull/47510
2486 [47521]: https://github.com/rust-lang/rust/pull/47521
2487 [47204]: https://github.com/rust-lang/rust/pull/47204
2488 [47251]: https://github.com/rust-lang/rust/pull/47251
2489 [47268]: https://github.com/rust-lang/rust/pull/47268
2490 [47282]: https://github.com/rust-lang/rust/pull/47282
2491 [47300]: https://github.com/rust-lang/rust/pull/47300
2492 [47349]: https://github.com/rust-lang/rust/pull/47349
2493 [46931]: https://github.com/rust-lang/rust/pull/46931
2494 [46985]: https://github.com/rust-lang/rust/pull/46985
2495 [47006]: https://github.com/rust-lang/rust/pull/47006
2496 [46830]: https://github.com/rust-lang/rust/pull/46830
2497 [46095]: https://github.com/rust-lang/rust/pull/46095
2498 [46666]: https://github.com/rust-lang/rust/pull/46666
2499 [46196]: https://github.com/rust-lang/rust/pull/46196
2500 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
2501 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
2502 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
2503 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
2504 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
2507 Version 1.24.1 (2018-03-01)
2508 ==========================
2510 - [Do not abort when unwinding through FFI][48251]
2511 - [Emit UTF-16 files for linker arguments on Windows][48318]
2512 - [Make the error index generator work again][48308]
2513 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
2515 [48251]: https://github.com/rust-lang/rust/issues/48251
2516 [48308]: https://github.com/rust-lang/rust/issues/48308
2517 [48318]: https://github.com/rust-lang/rust/issues/48318
2518 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
2521 Version 1.24.0 (2018-02-15)
2522 ==========================
2526 - [External `sysv64` ffi is now available.][46528]
2527 eg. `extern "sysv64" fn foo () {}`
2531 - [rustc now uses 16 codegen units by default for release builds.][46910]
2532 For the fastest builds, utilize `codegen-units=1`.
2533 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
2534 - [Add `aarch64-unknown-openbsd` support][46760]
2538 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
2539 improvement in performance in the majority of cases.
2540 - [`OsStr`'s `Debug` implementation is now lossless and consistent
2541 with Windows.][46798]
2542 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
2543 - [impl `From<bool>` for `AtomicBool`][46293]
2544 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
2545 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
2546 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
2547 - [float::from_bits now just uses transmute.][46012] This provides
2548 some optimisations from LLVM.
2549 - [Copied `AsciiExt` methods onto `char`][46077]
2550 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
2551 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
2552 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
2553 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
2557 - [`RefCell::replace`]
2559 - [`atomic::spin_loop_hint`]
2561 The following functions can now be used in a constant expression.
2562 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
2564 - [`AtomicBool::new`][46287]
2565 - [`AtomicUsize::new`][46287]
2566 - [`AtomicIsize::new`][46287]
2567 - [`AtomicPtr::new`][46287]
2568 - [`Cell::new`][46287]
2569 - [`{integer}::min_value`][46287]
2570 - [`{integer}::max_value`][46287]
2571 - [`mem::size_of`][46287]
2572 - [`mem::align_of`][46287]
2573 - [`ptr::null`][46287]
2574 - [`ptr::null_mut`][46287]
2575 - [`RefCell::new`][46287]
2576 - [`UnsafeCell::new`][46287]
2580 - [Added a `workspace.default-members` config that
2581 overrides implied `--all` in virtual workspaces.][cargo/4743]
2582 - [Enable incremental by default on development builds.][cargo/4817] Also added
2583 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
2584 per-project or global basis respectively.
2591 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
2592 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
2593 in accordance with IETF RFC 4291 §2.2.
2594 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
2595 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
2596 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
2597 - [Leading zeros in tuple struct members is now an error][47084]
2598 - [`column!()` macro is one-based instead of zero-based][46977]
2599 - [`fmt::Arguments` can no longer be shared across threads][45198]
2600 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
2601 - [Cargo sets a different working directory for the compiler][cargo/4788]
2603 [44884]: https://github.com/rust-lang/rust/pull/44884
2604 [45198]: https://github.com/rust-lang/rust/pull/45198
2605 [45506]: https://github.com/rust-lang/rust/pull/45506
2606 [45904]: https://github.com/rust-lang/rust/pull/45904
2607 [45990]: https://github.com/rust-lang/rust/pull/45990
2608 [46012]: https://github.com/rust-lang/rust/pull/46012
2609 [46077]: https://github.com/rust-lang/rust/pull/46077
2610 [46094]: https://github.com/rust-lang/rust/pull/46094
2611 [46284]: https://github.com/rust-lang/rust/pull/46284
2612 [46287]: https://github.com/rust-lang/rust/pull/46287
2613 [46293]: https://github.com/rust-lang/rust/pull/46293
2614 [46528]: https://github.com/rust-lang/rust/pull/46528
2615 [46671]: https://github.com/rust-lang/rust/pull/46671
2616 [46713]: https://github.com/rust-lang/rust/pull/46713
2617 [46735]: https://github.com/rust-lang/rust/pull/46735
2618 [46749]: https://github.com/rust-lang/rust/pull/46749
2619 [46760]: https://github.com/rust-lang/rust/pull/46760
2620 [46798]: https://github.com/rust-lang/rust/pull/46798
2621 [46828]: https://github.com/rust-lang/rust/pull/46828
2622 [46831]: https://github.com/rust-lang/rust/pull/46831
2623 [46833]: https://github.com/rust-lang/rust/pull/46833
2624 [46910]: https://github.com/rust-lang/rust/pull/46910
2625 [46977]: https://github.com/rust-lang/rust/pull/46977
2626 [47018]: https://github.com/rust-lang/rust/pull/47018
2627 [47080]: https://github.com/rust-lang/rust/pull/47080
2628 [47084]: https://github.com/rust-lang/rust/pull/47084
2629 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
2630 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
2631 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
2632 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
2633 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
2634 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
2637 Version 1.23.0 (2018-01-04)
2638 ==========================
2642 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
2643 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
2644 Which should fix some confusing errors in some operations.
2648 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
2649 undefined behavior.][45920]
2650 - [rustc now suggests renaming import if names clash.][45660]
2651 - [Display errors/warnings correctly when there are zero-width or
2652 wide characters.][45711]
2653 - [rustc now avoids unnecessary copies of arguments that are
2654 simple bindings][45380] This should improve memory usage on average by 5-10%.
2655 - [Updated musl used to build musl rustc to 1.1.17][45393]
2659 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
2660 - [Implement Hash for raw pointers to unsized types][45483]
2661 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
2662 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
2663 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
2664 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
2665 and `<*mut T>::as_mut`][44932]
2666 - [Optimized `Thread::{park, unpark}` implementation][45524]
2667 - [Improved `SliceExt::binary_search` performance.][45333]
2668 - [impl `FromIterator<()>` for `()`][45379]
2669 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
2677 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
2678 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
2679 - [Added unit test checking to `cargo check`][cargo/4592]
2680 - [Cargo now lets you install a specific version
2681 using `cargo install --version`][cargo/4637]
2685 - [Releases now ship with the Cargo book documentation.][45692]
2686 - [rustdoc now prints rendering warnings on every run.][45324]
2690 - [Changes have been made to type equality to make it more correct,
2691 in rare cases this could break some code.][45853] [Tracking issue for
2692 further information][45852]
2693 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
2694 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
2695 Android 9, the minimum supported version is Android 14.
2696 - [Bumped the minimum LLVM to 3.9][45326]
2698 [44042]: https://github.com/rust-lang/rust/pull/44042
2699 [44932]: https://github.com/rust-lang/rust/pull/44932
2700 [45267]: https://github.com/rust-lang/rust/pull/45267
2701 [45324]: https://github.com/rust-lang/rust/pull/45324
2702 [45326]: https://github.com/rust-lang/rust/pull/45326
2703 [45333]: https://github.com/rust-lang/rust/pull/45333
2704 [45379]: https://github.com/rust-lang/rust/pull/45379
2705 [45380]: https://github.com/rust-lang/rust/pull/45380
2706 [45393]: https://github.com/rust-lang/rust/pull/45393
2707 [45435]: https://github.com/rust-lang/rust/pull/45435
2708 [45483]: https://github.com/rust-lang/rust/pull/45483
2709 [45524]: https://github.com/rust-lang/rust/pull/45524
2710 [45571]: https://github.com/rust-lang/rust/pull/45571
2711 [45580]: https://github.com/rust-lang/rust/pull/45580
2712 [45610]: https://github.com/rust-lang/rust/pull/45610
2713 [45660]: https://github.com/rust-lang/rust/pull/45660
2714 [45692]: https://github.com/rust-lang/rust/pull/45692
2715 [45711]: https://github.com/rust-lang/rust/pull/45711
2716 [45772]: https://github.com/rust-lang/rust/pull/45772
2717 [45852]: https://github.com/rust-lang/rust/issues/45852
2718 [45853]: https://github.com/rust-lang/rust/pull/45853
2719 [45887]: https://github.com/rust-lang/rust/pull/45887
2720 [45920]: https://github.com/rust-lang/rust/pull/45920
2721 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
2722 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
2723 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
2726 Version 1.22.1 (2017-11-22)
2727 ==========================
2729 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
2731 [46183]: https://github.com/rust-lang/rust/pull/46183
2733 Version 1.22.0 (2017-11-22)
2734 ==========================
2738 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
2739 - [Now accepts underscores in unicode escapes][43716]
2740 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
2741 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
2745 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
2746 - [rustc will no longer inline in codegen units when compiling for debug][45075]
2747 This should decrease compile times for debug builds.
2748 - [strict memory alignment now enabled on ARMv6][45094]
2749 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
2753 - [Allow atomic operations up to 32 bits
2754 on `armv5te_unknown_linux_gnueabi`][44978]
2755 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
2756 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
2757 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
2758 - [Properly detect overflow in `Instant += Duration`.][44220]
2759 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
2760 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
2761 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
2768 - [Cargo will now build multi file examples in subdirectories of the `examples`
2769 folder that have a `main.rs` file.][cargo/4496]
2770 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
2771 the old format will continue to work and can be updated with `cargo update`.
2772 - [Now supports vendoring git repositories][cargo/3992]
2776 - [`libbacktrace` is now available on Apple platforms.][44251]
2777 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
2778 This now lets you specify that a given code example will fail to compile.
2782 - [The minimum Android version that rustc can build for has been bumped
2783 to `4.0` from `2.3`][45656]
2784 - [Allowing `T op= &T` for numeric types has broken some type
2785 inference cases][45480]
2788 [42526]: https://github.com/rust-lang/rust/pull/42526
2789 [43017]: https://github.com/rust-lang/rust/pull/43017
2790 [43716]: https://github.com/rust-lang/rust/pull/43716
2791 [43949]: https://github.com/rust-lang/rust/pull/43949
2792 [44015]: https://github.com/rust-lang/rust/pull/44015
2793 [44220]: https://github.com/rust-lang/rust/pull/44220
2794 [44251]: https://github.com/rust-lang/rust/pull/44251
2795 [44287]: https://github.com/rust-lang/rust/pull/44287
2796 [44303]: https://github.com/rust-lang/rust/pull/44303
2797 [44456]: https://github.com/rust-lang/rust/pull/44456
2798 [44466]: https://github.com/rust-lang/rust/pull/44466
2799 [44895]: https://github.com/rust-lang/rust/pull/44895
2800 [44966]: https://github.com/rust-lang/rust/pull/44966
2801 [44978]: https://github.com/rust-lang/rust/pull/44978
2802 [45041]: https://github.com/rust-lang/rust/pull/45041
2803 [45064]: https://github.com/rust-lang/rust/pull/45064
2804 [45075]: https://github.com/rust-lang/rust/pull/45075
2805 [45094]: https://github.com/rust-lang/rust/pull/45094
2806 [45095]: https://github.com/rust-lang/rust/pull/45095
2807 [45480]: https://github.com/rust-lang/rust/issues/45480
2808 [45656]: https://github.com/rust-lang/rust/pull/45656
2809 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
2810 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
2811 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
2818 Version 1.21.0 (2017-10-12)
2819 ==========================
2823 - [You can now use static references for literals.][43838]
2827 let x: &'static u32 = &0;
2830 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
2833 my_macro!(Vec<i32>::new); // Always worked
2834 my_macro!(Vec::<i32>::new); // Now works
2839 - [Upgraded jemalloc to 4.5.0][43911]
2840 - [Enabled unwinding panics on Redox][43917]
2841 - [Now runs LLVM in parallel during translation phase.][43506]
2842 This should reduce peak memory usage.
2846 - [Generate builtin impls for `Clone` for all arrays and tuples that
2847 are `T: Clone`][43690]
2848 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
2849 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
2850 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
2855 [`std::mem::discriminant`]
2859 - [You can now call `cargo install` with multiple package names][cargo/4216]
2860 - [Cargo commands inside a virtual workspace will now implicitly
2861 pass `--all`][cargo/4335]
2862 - [Added a `[patch]` section to `Cargo.toml` to handle
2863 prepublication dependencies][cargo/4123] [RFC 1969]
2864 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
2865 like patterns][cargo/4270]
2866 - [Added the `--all-targets` option][cargo/4400]
2867 - [Using required dependencies as a feature is now deprecated and emits
2868 a warning][cargo/4364]
2873 - [Cargo docs are moving][43916]
2874 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
2875 - [The rustdoc book is now available][43863]
2876 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
2877 - [Added a preview of RLS has been made available through rustup][44204]
2878 Install with `rustup component add rls-preview`
2879 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
2880 Previously only showed `std::os::unix`.
2884 - [Changes in method matching against higher-ranked types][43880] This may cause
2885 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
2886 - [rustc's JSON error output's byte position start at top of file.][42973]
2887 Was previously relative to the rustc's internal `CodeMap` struct which
2888 required the unstable library `libsyntax` to correctly use.
2889 - [`unused_results` lint no longer ignores booleans][43728]
2891 [42565]: https://github.com/rust-lang/rust/pull/42565
2892 [42973]: https://github.com/rust-lang/rust/pull/42973
2893 [43348]: https://github.com/rust-lang/rust/pull/43348
2894 [43459]: https://github.com/rust-lang/rust/pull/43459
2895 [43506]: https://github.com/rust-lang/rust/pull/43506
2896 [43540]: https://github.com/rust-lang/rust/pull/43540
2897 [43690]: https://github.com/rust-lang/rust/pull/43690
2898 [43728]: https://github.com/rust-lang/rust/pull/43728
2899 [43838]: https://github.com/rust-lang/rust/pull/43838
2900 [43863]: https://github.com/rust-lang/rust/pull/43863
2901 [43880]: https://github.com/rust-lang/rust/pull/43880
2902 [43911]: https://github.com/rust-lang/rust/pull/43911
2903 [43916]: https://github.com/rust-lang/rust/pull/43916
2904 [43917]: https://github.com/rust-lang/rust/pull/43917
2905 [44204]: https://github.com/rust-lang/rust/pull/44204
2906 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
2907 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
2908 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
2909 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
2910 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
2911 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
2912 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
2913 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
2914 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
2916 Version 1.20.0 (2017-08-31)
2917 ===========================
2921 - [Associated constants are now stabilised.][42809]
2922 - [A lot of macro bugs are now fixed.][42913]
2927 - [Struct fields are now properly coerced to the expected field type.][42807]
2928 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
2929 `wasm32-experimental-emscripten` target.
2930 - [Changed some of the error messages to be more helpful.][42033]
2931 - [Add support for RELRO(RELocation Read-Only) for platforms that support
2933 - [rustc now reports the total number of errors on compilation failure][43015]
2934 previously this was only the number of errors in the pass that failed.
2935 - [Expansion in rustc has been sped up 29x.][42533]
2936 - [added `msp430-none-elf` target.][43099]
2937 - [rustc will now suggest one-argument enum variant to fix type mismatch when
2939 - [Fixes backtraces on Redox][43228]
2940 - [rustc now identifies different versions of same crate when absolute paths of
2941 different types match in an error message.][42826]
2947 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
2948 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
2950 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
2951 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
2952 - [Impl `Clone` for `DefaultHasher`.][42799]
2953 - [Impl `Sync` for `SyncSender`.][42397]
2954 - [Impl `FromStr` for `char`][42271]
2955 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
2957 - [allow messages in the `unimplemented!()` macro.][42155]
2958 ie. `unimplemented!("Waiting for 1.21 to be stable")`
2959 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
2960 - [Upgrade to Unicode 10.0.0][42999]
2961 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
2962 - [Skip the main thread's manual stack guard on Linux][43072]
2963 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
2964 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
2966 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
2971 - [`CStr::into_c_string`]
2972 - [`CString::as_c_str`]
2973 - [`CString::into_boxed_c_str`]
2974 - [`Chain::get_mut`]
2975 - [`Chain::get_ref`]
2976 - [`Chain::into_inner`]
2977 - [`Option::get_or_insert_with`]
2978 - [`Option::get_or_insert`]
2979 - [`OsStr::into_os_string`]
2980 - [`OsString::into_boxed_os_str`]
2983 - [`Utf8Error::error_len`]
2984 - [`char::EscapeDebug`]
2985 - [`char::escape_debug`]
2986 - [`compile_error!`]
2987 - [`f32::from_bits`]
2989 - [`f64::from_bits`]
2991 - [`mem::ManuallyDrop`]
2992 - [`slice::sort_unstable_by_key`]
2993 - [`slice::sort_unstable_by`]
2994 - [`slice::sort_unstable`]
2995 - [`str::from_boxed_utf8_unchecked`]
2996 - [`str::as_bytes_mut`]
2997 - [`str::as_bytes_mut`]
2998 - [`str::from_utf8_mut`]
2999 - [`str::from_utf8_unchecked_mut`]
3001 - [`str::get_unchecked_mut`]
3002 - [`str::get_unchecked`]
3004 - [`str::into_boxed_bytes`]
3009 - [Cargo API token location moved from `~/.cargo/config` to
3010 `~/.cargo/credentials`.][cargo/3978]
3011 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3012 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3013 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3014 - [You can now specify version of a binary when installed through
3015 `cargo install` using `--vers`.][cargo/4229]
3016 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3017 failure.][cargo/4248]
3018 - [Changed the convention around which file is the crate root.][cargo/4259]
3019 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3020 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3025 - [Functions with `'static` in their return types will now not be as usable as
3026 if they were using lifetime parameters instead.][42417]
3027 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3028 takes the sign of NaN into account where previously didn't.][42430]
3030 [42033]: https://github.com/rust-lang/rust/pull/42033
3031 [42155]: https://github.com/rust-lang/rust/pull/42155
3032 [42271]: https://github.com/rust-lang/rust/pull/42271
3033 [42397]: https://github.com/rust-lang/rust/pull/42397
3034 [42417]: https://github.com/rust-lang/rust/pull/42417
3035 [42430]: https://github.com/rust-lang/rust/pull/42430
3036 [42431]: https://github.com/rust-lang/rust/pull/42431
3037 [42533]: https://github.com/rust-lang/rust/pull/42533
3038 [42571]: https://github.com/rust-lang/rust/pull/42571
3039 [42613]: https://github.com/rust-lang/rust/pull/42613
3040 [42799]: https://github.com/rust-lang/rust/pull/42799
3041 [42807]: https://github.com/rust-lang/rust/pull/42807
3042 [42809]: https://github.com/rust-lang/rust/pull/42809
3043 [42822]: https://github.com/rust-lang/rust/pull/42822
3044 [42826]: https://github.com/rust-lang/rust/pull/42826
3045 [42854]: https://github.com/rust-lang/rust/pull/42854
3046 [42913]: https://github.com/rust-lang/rust/pull/42913
3047 [42999]: https://github.com/rust-lang/rust/pull/42999
3048 [43011]: https://github.com/rust-lang/rust/pull/43011
3049 [43015]: https://github.com/rust-lang/rust/pull/43015
3050 [43072]: https://github.com/rust-lang/rust/pull/43072
3051 [43077]: https://github.com/rust-lang/rust/pull/43077
3052 [43097]: https://github.com/rust-lang/rust/pull/43097
3053 [43099]: https://github.com/rust-lang/rust/pull/43099
3054 [43170]: https://github.com/rust-lang/rust/pull/43170
3055 [43178]: https://github.com/rust-lang/rust/pull/43178
3056 [43185]: https://github.com/rust-lang/rust/pull/43185
3057 [43228]: https://github.com/rust-lang/rust/pull/43228
3058 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3059 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3060 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3061 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3062 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3063 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3064 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3065 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3066 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3067 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3068 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3069 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3070 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3071 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3072 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3073 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3074 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3075 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3076 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3077 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3078 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3079 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3080 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3081 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3082 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3083 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3084 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3085 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3086 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3087 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3088 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3089 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3090 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3091 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3092 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3093 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3094 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3095 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3096 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3099 Version 1.19.0 (2017-07-20)
3100 ===========================
3105 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3106 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3107 - [Macro recursion limit increased to 1024 from 64.][41676]
3108 - [Added lint for detecting unused macros.][41907]
3109 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3110 For example: `let x = loop { break 7; };`
3111 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3112 contain `Copy` types and cannot have a `Drop` implementation.
3113 Example: `union Foo { bar: u8, baz: usize }`
3114 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3115 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3120 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3121 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3122 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3123 you should use `--target armv7-linux-androideabi`.
3124 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3125 - [Minor optimisation of string operations.][42037]
3126 - [Compiler error message is now `aborting due to previous error(s)` instead of
3127 `aborting due to N previous errors`][42150] This was previously inaccurate and
3128 would only count certain kinds of errors.
3129 - [The compiler now supports Visual Studio 2017][42225]
3130 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3131 - [Added a lot][42264] of [new error codes][42302]
3132 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3133 libraries with C Run-time Libraries(CRT) to be statically linked.
3134 - [Fixed various ARM codegen bugs][42740]
3139 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3140 `Extend<Cow<'a, str>>`][41449]
3141 - [`Vec` now implements `From<&mut [T]>`][41530]
3142 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3143 - [`SplitWhitespace` now implements `Clone`][41659]
3144 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3146 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3147 macros, but for printing to stderr.
3152 - [`OsString::shrink_to_fit`]
3155 - [`thread::ThreadId`]
3160 - [Build scripts can now add environment variables to the environment
3161 the crate is being compiled in.
3162 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3163 - [Subcommands now replace the current process rather than spawning a new
3164 child process][cargo/3970]
3165 - [Workspace members can now accept glob file patterns][cargo/3979]
3166 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3167 the members in a given workspace.][cargo/3988]
3168 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3169 - [Target directory path is now in the cargo metadata][cargo/4022]
3170 - [Cargo no longer checks out a local working directory for the
3171 crates.io index][cargo/4026] This should provide smaller file size for the
3172 registry, and improve cloning times, especially on Windows machines.
3173 - [Added an `--exclude` option for excluding certain packages when using the
3174 `--all` option][cargo/4031]
3175 - [Cargo will now automatically retry when receiving a 5xx error
3176 from crates.io][cargo/4032]
3177 - [The `--features` option now accepts multiple comma or space
3178 delimited values.][cargo/4084]
3179 - [Added support for custom target specific runners][cargo/3954]
3184 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3186 - [Rust will now release XZ compressed packages][rust-installer/57]
3187 - [rustup will now prefer to download rust packages with
3188 XZ compression][rustup/1100] over GZip packages.
3189 - [Added the ability to escape `#` in rust documentation][41785] By adding
3190 additional `#`'s ie. `##` is now `#`
3195 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3196 - [`-Z` flags are now no longer allowed to be used on the stable
3197 compiler.][41751] This has been a warning for a year previous to this.
3198 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3199 longer works][42844]. Users should migrate to the built-in `check`
3200 command, which has been available since 1.16.
3201 - [Ending a float literal with `._` is now a hard error.
3202 Example: `42._` .][41946]
3203 - [Any use of a private `extern crate` outside of its module is now a
3204 hard error.][36886] This was previously a warning.
3205 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3206 relative while the `::` prefix makes a path absolute, but was ignored and the
3207 path was relative regardless.
3208 - [Floating point constants in match patterns is now a hard error][36890]
3209 This was previously a warning.
3210 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3211 match patterns is now a hard error][36891] This was previously a warning.
3212 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3214 - [From the pound escape, lines consisting of multiple `#`s are
3216 - [It is an error to re-export private enum variants][42460]. This is
3217 known to break a number of crates that depend on an older version of
3219 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3220 to use it to find the linker, and the build will fail where it did
3221 not previously][42607]
3223 [36886]: https://github.com/rust-lang/rust/issues/36886
3224 [36888]: https://github.com/rust-lang/rust/issues/36888
3225 [36890]: https://github.com/rust-lang/rust/issues/36890
3226 [36891]: https://github.com/rust-lang/rust/issues/36891
3227 [36892]: https://github.com/rust-lang/rust/issues/36892
3228 [37406]: https://github.com/rust-lang/rust/issues/37406
3229 [39983]: https://github.com/rust-lang/rust/pull/39983
3230 [41145]: https://github.com/rust-lang/rust/pull/41145
3231 [41192]: https://github.com/rust-lang/rust/pull/41192
3232 [41258]: https://github.com/rust-lang/rust/pull/41258
3233 [41370]: https://github.com/rust-lang/rust/pull/41370
3234 [41449]: https://github.com/rust-lang/rust/pull/41449
3235 [41530]: https://github.com/rust-lang/rust/pull/41530
3236 [41624]: https://github.com/rust-lang/rust/pull/41624
3237 [41656]: https://github.com/rust-lang/rust/pull/41656
3238 [41659]: https://github.com/rust-lang/rust/pull/41659
3239 [41676]: https://github.com/rust-lang/rust/pull/41676
3240 [41751]: https://github.com/rust-lang/rust/pull/41751
3241 [41764]: https://github.com/rust-lang/rust/pull/41764
3242 [41785]: https://github.com/rust-lang/rust/pull/41785
3243 [41873]: https://github.com/rust-lang/rust/pull/41873
3244 [41907]: https://github.com/rust-lang/rust/pull/41907
3245 [41946]: https://github.com/rust-lang/rust/pull/41946
3246 [42016]: https://github.com/rust-lang/rust/pull/42016
3247 [42037]: https://github.com/rust-lang/rust/pull/42037
3248 [42068]: https://github.com/rust-lang/rust/pull/42068
3249 [42150]: https://github.com/rust-lang/rust/pull/42150
3250 [42162]: https://github.com/rust-lang/rust/pull/42162
3251 [42225]: https://github.com/rust-lang/rust/pull/42225
3252 [42264]: https://github.com/rust-lang/rust/pull/42264
3253 [42302]: https://github.com/rust-lang/rust/pull/42302
3254 [42460]: https://github.com/rust-lang/rust/issues/42460
3255 [42607]: https://github.com/rust-lang/rust/issues/42607
3256 [42740]: https://github.com/rust-lang/rust/pull/42740
3257 [42844]: https://github.com/rust-lang/rust/issues/42844
3258 [42948]: https://github.com/rust-lang/rust/pull/42948
3259 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3260 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3261 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3262 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3263 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3264 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3265 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3266 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3267 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3268 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3269 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3270 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3271 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3272 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3273 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3274 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3275 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3276 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3277 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3278 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3279 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3280 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3283 Version 1.18.0 (2017-06-08)
3284 ===========================
3289 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3290 make the item visible to just that module tree. Also accepts the keyword
3291 `crate` to make something public to the whole crate but not users of the
3292 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3293 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3294 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3295 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3296 types like `Write + Send`, trailing `+` are now supported in trait objects,
3297 and better error reporting for trait objects starting with `?Sized`.
3298 - [0e+10 is now a valid floating point literal][40589]
3299 - [Now warns if you bind a lifetime parameter to 'static][40734]
3300 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3301 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3302 representation in some cases.][40377]
3307 - [rustc can now emit mir with `--emit mir`][39891]
3308 - [Improved LLVM IR for trivial functions][40367]
3309 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3310 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3311 opportunities found through profiling
3312 - [Improved backtrace formatting when panicking][38165]
3317 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3318 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3319 iteration or reallocation.
3320 - [Simplified HashMap Bucket interface][40561] provides performance
3321 improvements for iterating and cloning.
3322 - [Specialize Vec::from_elem to use calloc][40409]
3323 - [Fixed Race condition in fs::create_dir_all][39799]
3324 - [No longer caching stdio on Windows][40516]
3325 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3326 2.50%~ faster and in one case now 12.50% faster.
3327 - [Optimized `AtomicBool::fetch_nand`][41143]
3332 - [`Child::try_wait`]
3333 - [`HashMap::retain`]
3334 - [`HashSet::retain`]
3336 - [`TcpStream::peek`]
3337 - [`UdpSocket::peek`]
3338 - [`UdpSocket::peek_from`]
3343 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3344 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3345 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3346 - [Added Android build support][cargo/3885]
3347 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3348 of a certain type, for example `cargo build --bins` will build all
3350 - [Added support for haiku][cargo/3952]
3355 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
3356 - [Added rust-windbg script for better debugging on Windows][39983]
3357 - [Rust now uses the official cross compiler for NetBSD][40612]
3358 - [rustdoc now accepts `#` at the start of files][40828]
3359 - [Fixed jemalloc support for musl][41168]
3364 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
3365 always placed after the sign if it exists and before the digits. With the `#`
3366 flag the zeroes are placed after the prefix and before the digits.
3367 - [Due to the struct field optimisation][40377], using `transmute` on structs
3368 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
3369 always been undefined behavior, but is now more likely to break in practice.
3370 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
3371 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
3372 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
3373 - [Overlapping inherent `impl`s are now a hard error][40728]
3374 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
3375 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
3376 `out.asm` and `out.ll` instead of only one of the filetypes.
3377 - [ calling a function that returns `Self` will no longer work][41805] when
3378 the size of `Self` cannot be statically determined.
3379 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
3380 this has caused a few regressions namely:
3382 - Changed the link order of local static/dynamic libraries (respecting the
3383 order on given rather than having the compiler reorder).
3384 - Changed how MinGW is linked, native code linked to dynamic libraries
3385 may require manually linking to the gcc support library (for the native
3388 [38165]: https://github.com/rust-lang/rust/pull/38165
3389 [39799]: https://github.com/rust-lang/rust/pull/39799
3390 [39891]: https://github.com/rust-lang/rust/pull/39891
3391 [39983]: https://github.com/rust-lang/rust/pull/39983
3392 [40043]: https://github.com/rust-lang/rust/pull/40043
3393 [40241]: https://github.com/rust-lang/rust/pull/40241
3394 [40338]: https://github.com/rust-lang/rust/pull/40338
3395 [40367]: https://github.com/rust-lang/rust/pull/40367
3396 [40377]: https://github.com/rust-lang/rust/pull/40377
3397 [40409]: https://github.com/rust-lang/rust/pull/40409
3398 [40516]: https://github.com/rust-lang/rust/pull/40516
3399 [40556]: https://github.com/rust-lang/rust/pull/40556
3400 [40561]: https://github.com/rust-lang/rust/pull/40561
3401 [40589]: https://github.com/rust-lang/rust/pull/40589
3402 [40612]: https://github.com/rust-lang/rust/pull/40612
3403 [40723]: https://github.com/rust-lang/rust/pull/40723
3404 [40728]: https://github.com/rust-lang/rust/pull/40728
3405 [40731]: https://github.com/rust-lang/rust/pull/40731
3406 [40734]: https://github.com/rust-lang/rust/pull/40734
3407 [40805]: https://github.com/rust-lang/rust/pull/40805
3408 [40807]: https://github.com/rust-lang/rust/pull/40807
3409 [40828]: https://github.com/rust-lang/rust/pull/40828
3410 [40870]: https://github.com/rust-lang/rust/pull/40870
3411 [41085]: https://github.com/rust-lang/rust/pull/41085
3412 [41143]: https://github.com/rust-lang/rust/pull/41143
3413 [41168]: https://github.com/rust-lang/rust/pull/41168
3414 [41270]: https://github.com/rust-lang/rust/issues/41270
3415 [41469]: https://github.com/rust-lang/rust/pull/41469
3416 [41805]: https://github.com/rust-lang/rust/issues/41805
3417 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
3418 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
3419 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
3420 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
3421 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
3422 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
3423 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
3424 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
3425 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
3426 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
3427 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
3428 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
3429 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
3430 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
3433 Version 1.17.0 (2017-04-27)
3434 ===========================
3439 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
3440 * [Fields of structs may be initialized without duplicating the field/variable
3441 names][39761]. [RFC 1682]
3442 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
3443 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3444 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
3445 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
3446 `'b`. Soundness fix.
3447 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
3448 * [Static variables may contain references to other statics][40027]
3453 * [Exit quickly on only `--emit dep-info`][40336]
3454 * [Make `-C relocation-model` more correctly determine whether the linker
3455 creates a position-independent executable][40245]
3456 * [Add `-C overflow-checks` to directly control whether integer overflow
3458 * [The rustc type checker now checks items on demand instead of in a single
3459 in-order pass][40008]. This is mostly an internal refactoring in support of
3460 future work, including incremental type checking, but also resolves [RFC
3461 1647], allowing `Self` to appear in `impl` `where` clauses.
3462 * [Optimize vtable loads][39995]
3463 * [Turn off vectorization for Emscripten targets][39990]
3464 * [Provide suggestions for unknown macros imported with `use`][39953]
3465 * [Fix ICEs in path resolution][39939]
3466 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
3467 * [Add clearer error message using `&str + &str`][39116]
3478 * [`Ordering::then`]
3479 * [`Ordering::then_with`]
3480 * [`BTreeMap::range`]
3481 * [`BTreeMap::range_mut`]
3482 * [`collections::Bound`]
3483 * [`process::abort`]
3484 * [`ptr::read_unaligned`]
3485 * [`ptr::write_unaligned`]
3486 * [`Result::expect_err`]
3489 * [`Cell::into_inner`]
3495 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
3496 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
3497 * [`String` implements `FromIterator<&char>`][40028]
3498 * `Box` [implements][40009] a number of new conversions:
3499 `From<Box<str>> for String`,
3500 `From<Box<[T]>> for Vec<T>`,
3501 `From<Box<CStr>> for CString`,
3502 `From<Box<OsStr>> for OsString`,
3503 `From<Box<Path>> for PathBuf`,
3504 `Into<Box<str>> for String`,
3505 `Into<Box<[T]>> for Vec<T>`,
3506 `Into<Box<CStr>> for CString`,
3507 `Into<Box<OsStr>> for OsString`,
3508 `Into<Box<Path>> for PathBuf`,
3509 `Default for Box<str>`,
3510 `Default for Box<CStr>`,
3511 `Default for Box<OsStr>`,
3512 `From<&CStr> for Box<CStr>`,
3513 `From<&OsStr> for Box<OsStr>`,
3514 `From<&Path> for Box<Path>`
3515 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
3516 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
3517 * [Slightly optimize `slice::sort`][39538]
3518 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
3519 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
3520 `Box<str>` implements `From<&str>`][39438]
3521 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
3522 `From<(I, u16)> where I: Into<IpAddr>`][39372]
3523 * [`format!` estimates the needed capacity before writing a string][39356]
3524 * [Support unprivileged symlink creation in Windows][38921]
3525 * [`PathBuf` implements `Default`][38764]
3526 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
3527 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
3528 and poor hash functions.
3533 * [Add `cargo check --all`][cargo/3731]
3534 * [Add an option to ignore SSL revocation checking][cargo/3699]
3535 * [Add `cargo run --package`][cargo/3691]
3536 * [Add `required_features`][cargo/3667]
3537 * [Assume `build.rs` is a build script][cargo/3664]
3538 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
3543 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
3545 * [The "Unstable Book" documents nightly-only features][ubook]
3546 * [Improve the style of the sidebar in rustdoc output][40265]
3547 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
3548 * [Fix MSP430 breakage due to `i128`][40257]
3549 * [Preliminary Solaris/SPARCv9 support][39903]
3550 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
3551 run without installing the MSVC runtime.
3552 * [`rustdoc --test` includes file names in test names][39788]
3553 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
3554 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
3555 * [Initial support for `aarch64-unknown-freebsd`][39491]
3556 * [Initial support for `i686-unknown-netbsd`][39426]
3557 * [This release no longer includes the old makefile build system][39431]. Rust
3558 is built with a custom build system, written in Rust, and with Cargo.
3559 * [Add Debug implementations for libcollection structs][39002]
3560 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
3561 * [`--test-threads=0` produces an error][38945]
3562 * [`rustup` installs documentation by default][40526]
3563 * [The Rust source includes NatVis visualizations][39843]. These can be used by
3564 WinDbg and Visual Studio to improve the debugging experience.
3569 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
3570 workaround, either use MSVC 2015 or run vcvars.bat.
3571 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
3572 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
3573 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
3575 * [`format!` and `Display::to_string` panic if an underlying formatting
3576 implementation returns an error][40117]. Previously the error was silently
3577 ignored. It is incorrect for `write_fmt` to return an error when writing
3579 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
3580 crates were marked stable and could be accessed from the stable toolchain.
3581 * [Rust git source no longer includes vendored crates][39728]. Those that need
3582 to build with vendored crates should build from release tarballs.
3583 * [Fix inert attributes from `proc_macro_derives`][39572]
3584 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
3585 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
3587 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
3588 existing code generally ignores the type of dead-code unless a type-hint is
3589 provided; this can cause surprising inference interactions particularly around
3590 defaulting. The new code uniformly ignores the result type of dead-code.
3591 * [Tuple-struct constructors with private fields are no longer visible][38932]
3592 * [Lifetime parameters that do not appear in the arguments are now considered
3593 early-bound][38897], resolving a soundness bug (#[32330]). The
3594 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
3596 * [rustdoc: fix doctests with non-feature crate attributes][38161]
3597 * [Make transmuting from fn item types to pointer-sized types a hard
3600 [27787]: https://github.com/rust-lang/rust/issues/27787
3601 [32330]: https://github.com/rust-lang/rust/issues/32330
3602 [34198]: https://github.com/rust-lang/rust/pull/34198
3603 [38161]: https://github.com/rust-lang/rust/pull/38161
3604 [38368]: https://github.com/rust-lang/rust/pull/38368
3605 [38584]: https://github.com/rust-lang/rust/issues/38584
3606 [38661]: https://github.com/rust-lang/rust/pull/38661
3607 [38764]: https://github.com/rust-lang/rust/pull/38764
3608 [38864]: https://github.com/rust-lang/rust/issues/38864
3609 [38897]: https://github.com/rust-lang/rust/pull/38897
3610 [38921]: https://github.com/rust-lang/rust/pull/38921
3611 [38932]: https://github.com/rust-lang/rust/pull/38932
3612 [38945]: https://github.com/rust-lang/rust/pull/38945
3613 [38981]: https://github.com/rust-lang/rust/pull/38981
3614 [39002]: https://github.com/rust-lang/rust/pull/39002
3615 [39116]: https://github.com/rust-lang/rust/pull/39116
3616 [39193]: https://github.com/rust-lang/rust/pull/39193
3617 [39265]: https://github.com/rust-lang/rust/pull/39265
3618 [39356]: https://github.com/rust-lang/rust/pull/39356
3619 [39372]: https://github.com/rust-lang/rust/pull/39372
3620 [39426]: https://github.com/rust-lang/rust/pull/39426
3621 [39431]: https://github.com/rust-lang/rust/pull/39431
3622 [39438]: https://github.com/rust-lang/rust/pull/39438
3623 [39440]: https://github.com/rust-lang/rust/pull/39440
3624 [39485]: https://github.com/rust-lang/rust/pull/39485
3625 [39491]: https://github.com/rust-lang/rust/pull/39491
3626 [39518]: https://github.com/rust-lang/rust/pull/39518
3627 [39538]: https://github.com/rust-lang/rust/pull/39538
3628 [39572]: https://github.com/rust-lang/rust/pull/39572
3629 [39633]: https://github.com/rust-lang/rust/pull/39633
3630 [39642]: https://github.com/rust-lang/rust/pull/39642
3631 [39728]: https://github.com/rust-lang/rust/pull/39728
3632 [39761]: https://github.com/rust-lang/rust/pull/39761
3633 [39788]: https://github.com/rust-lang/rust/pull/39788
3634 [39793]: https://github.com/rust-lang/rust/pull/39793
3635 [39837]: https://github.com/rust-lang/rust/pull/39837
3636 [39843]: https://github.com/rust-lang/rust/pull/39843
3637 [39851]: https://github.com/rust-lang/rust/pull/39851
3638 [39903]: https://github.com/rust-lang/rust/pull/39903
3639 [39939]: https://github.com/rust-lang/rust/pull/39939
3640 [39953]: https://github.com/rust-lang/rust/pull/39953
3641 [39960]: https://github.com/rust-lang/rust/pull/39960
3642 [39990]: https://github.com/rust-lang/rust/pull/39990
3643 [39995]: https://github.com/rust-lang/rust/pull/39995
3644 [40008]: https://github.com/rust-lang/rust/pull/40008
3645 [40009]: https://github.com/rust-lang/rust/pull/40009
3646 [40027]: https://github.com/rust-lang/rust/pull/40027
3647 [40028]: https://github.com/rust-lang/rust/pull/40028
3648 [40037]: https://github.com/rust-lang/rust/pull/40037
3649 [40117]: https://github.com/rust-lang/rust/pull/40117
3650 [40166]: https://github.com/rust-lang/rust/pull/40166
3651 [40245]: https://github.com/rust-lang/rust/pull/40245
3652 [40257]: https://github.com/rust-lang/rust/pull/40257
3653 [40261]: https://github.com/rust-lang/rust/pull/40261
3654 [40265]: https://github.com/rust-lang/rust/pull/40265
3655 [40319]: https://github.com/rust-lang/rust/pull/40319
3656 [40336]: https://github.com/rust-lang/rust/pull/40336
3657 [40526]: https://github.com/rust-lang/rust/pull/40526
3658 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3659 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
3660 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
3661 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
3662 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
3663 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
3664 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
3665 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
3666 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
3667 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
3668 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
3669 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
3670 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
3671 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
3672 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
3673 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
3674 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
3675 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
3676 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
3677 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
3678 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
3679 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
3680 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
3681 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
3682 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
3683 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
3684 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
3685 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
3686 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
3687 [mdbook]: https://crates.io/crates/mdbook
3688 [ubook]: https://doc.rust-lang.org/unstable-book/
3691 Version 1.16.0 (2017-03-16)
3692 ===========================
3697 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3698 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3699 match patterns][38069]
3700 * [Clean up semantics of `self` in an import list][38313]
3701 * [`Self` may appear in `impl` headers][38920]
3702 * [`Self` may appear in struct expressions][39282]
3707 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
3708 a `.rmeta` file containing only crate metadata][38571]. This can be
3709 used by tools like the Rust Language Service to perform
3710 metadata-only builds.
3711 * [Levenshtein based typo suggestions now work in most places, while
3712 previously they worked only for fields and sometimes for local
3713 variables][38927]. Together with the overhaul of "no
3714 resolution"/"unexpected resolution" errors (#[38154]) they result in
3715 large and systematic improvement in resolution diagnostics.
3716 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
3718 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
3719 * [`rustc` no longer attempts to provide "consider using an explicit
3720 lifetime" suggestions][37057]. They were inaccurate.
3725 * [`VecDeque::truncate`]
3726 * [`VecDeque::resize`]
3727 * [`String::insert_str`]
3728 * [`Duration::checked_add`]
3729 * [`Duration::checked_sub`]
3730 * [`Duration::checked_div`]
3731 * [`Duration::checked_mul`]
3734 * [`SocketAddr::is_ipv4`]
3735 * [`SocketAddr::is_ipv6`]
3736 * [`IpAddr::is_ipv4`]
3737 * [`IpAddr::is_ipv6`]
3739 * [`Vec::dedup_by_key`]
3740 * [`Result::unwrap_or_default`]
3741 * [`<*const T>::wrapping_offset`]
3742 * [`<*mut T>::wrapping_offset`]
3743 * `CommandExt::creation_flags`
3744 * [`File::set_permissions`]
3745 * [`String::split_off`]
3750 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
3751 their argument by `Borrow` parameter][37761]
3752 * [All public types in std implement `Debug`][38006]
3753 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
3754 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
3755 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3757 * [std: Fix partial writes in `LineWriter`][38062]
3758 * [std: Clamp max read/write sizes on Unix][38062]
3759 * [Use more specific panic message for `&str` slicing errors][38066]
3760 * [`TcpListener::set_only_v6` is deprecated][38304]. This
3761 functionality cannot be achieved in std currently.
3762 * [`writeln!`, like `println!`, now accepts a form with no string
3763 or formatting arguments, to just print a newline][38469]
3764 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
3765 * [Reduce the size of static data in `std_unicode::tables`][38781]
3766 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
3767 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
3769 * [`Duration` implements `Sum`][38712]
3770 * [`String` implements `ToSocketAddrs`][39048]
3775 * [The `cargo check` command does a type check of a project without
3776 building it][cargo/3296]
3777 * [crates.io will display CI badges from Travis and AppVeyor, if
3778 specified in Cargo.toml][cargo/3546]
3779 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
3780 * [Compilation profiles accept integer values for `debug`, in addition
3781 to `true` and `false`. These are passed to `rustc` as the value to
3782 `-C debuginfo`][cargo/3534]
3783 * [Implement `cargo --version --verbose`][cargo/3604]
3784 * [All builds now output 'dep-info' build dependencies compatible with
3785 make and ninja][cargo/3557]
3786 * [Build all workspace members with `build --all`][cargo/3511]
3787 * [Document all workspace members with `doc --all`][cargo/3515]
3788 * [Path deps outside workspace are not members][cargo/3443]
3793 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
3794 the path to the Rust implementation][38589]
3795 * [The `armv7-linux-androideabi` target no longer enables NEON
3796 extensions, per Google's ABI guide][38413]
3797 * [The stock standard library can be compiled for Redox OS][38401]
3798 * [Rust has initial SPARC support][38726]. Tier 3. No builds
3800 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
3802 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
3807 * [Uninhabitable enums (those without any variants) no longer permit wildcard
3808 match patterns][38069]
3809 * In this release, references to uninhabited types can not be
3810 pattern-matched. This was accidentally allowed in 1.15.
3811 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
3812 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
3814 * [Clean up semantics of `self` in an import list][38313]
3815 * Reimplemented lifetime elision. This change was almost entirely compatible
3816 with existing code, but it did close a number of small bugs and loopholes,
3817 as well as being more accepting in some other [cases][41105].
3819 [37057]: https://github.com/rust-lang/rust/pull/37057
3820 [37761]: https://github.com/rust-lang/rust/pull/37761
3821 [38006]: https://github.com/rust-lang/rust/pull/38006
3822 [38051]: https://github.com/rust-lang/rust/pull/38051
3823 [38062]: https://github.com/rust-lang/rust/pull/38062
3824 [38062]: https://github.com/rust-lang/rust/pull/38622
3825 [38066]: https://github.com/rust-lang/rust/pull/38066
3826 [38069]: https://github.com/rust-lang/rust/pull/38069
3827 [38131]: https://github.com/rust-lang/rust/pull/38131
3828 [38154]: https://github.com/rust-lang/rust/pull/38154
3829 [38274]: https://github.com/rust-lang/rust/pull/38274
3830 [38304]: https://github.com/rust-lang/rust/pull/38304
3831 [38313]: https://github.com/rust-lang/rust/pull/38313
3832 [38314]: https://github.com/rust-lang/rust/pull/38314
3833 [38327]: https://github.com/rust-lang/rust/pull/38327
3834 [38401]: https://github.com/rust-lang/rust/pull/38401
3835 [38413]: https://github.com/rust-lang/rust/pull/38413
3836 [38469]: https://github.com/rust-lang/rust/pull/38469
3837 [38559]: https://github.com/rust-lang/rust/pull/38559
3838 [38571]: https://github.com/rust-lang/rust/pull/38571
3839 [38580]: https://github.com/rust-lang/rust/pull/38580
3840 [38589]: https://github.com/rust-lang/rust/pull/38589
3841 [38670]: https://github.com/rust-lang/rust/pull/38670
3842 [38712]: https://github.com/rust-lang/rust/pull/38712
3843 [38726]: https://github.com/rust-lang/rust/pull/38726
3844 [38781]: https://github.com/rust-lang/rust/pull/38781
3845 [38798]: https://github.com/rust-lang/rust/pull/38798
3846 [38909]: https://github.com/rust-lang/rust/pull/38909
3847 [38920]: https://github.com/rust-lang/rust/pull/38920
3848 [38927]: https://github.com/rust-lang/rust/pull/38927
3849 [39048]: https://github.com/rust-lang/rust/pull/39048
3850 [39282]: https://github.com/rust-lang/rust/pull/39282
3851 [39379]: https://github.com/rust-lang/rust/pull/39379
3852 [41105]: https://github.com/rust-lang/rust/issues/41105
3853 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3854 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
3855 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
3856 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
3857 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
3858 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
3859 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
3860 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
3861 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
3862 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
3863 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
3864 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
3865 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
3866 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
3867 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
3868 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
3869 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
3870 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
3871 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
3872 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
3873 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
3874 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
3875 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
3876 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
3877 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
3878 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
3879 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
3880 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
3881 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
3882 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
3885 Version 1.15.1 (2017-02-09)
3886 ===========================
3888 * [Fix IntoIter::as_mut_slice's signature][39466]
3889 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
3891 [39466]: https://github.com/rust-lang/rust/pull/39466
3892 [39523]: https://github.com/rust-lang/rust/pull/39523
3895 Version 1.15.0 (2017-02-02)
3896 ===========================
3901 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
3902 stable. This allows popular code-generating crates like Serde and Diesel to
3903 work ergonomically. [RFC 1681].
3904 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
3905 with curly braces][36868]. Part of [RFC 1506].
3906 * [A number of minor changes to name resolution have been activated][37127].
3907 They add up to more consistent semantics, allowing for future evolution of
3908 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
3909 details of what is different. The breaking changes here have been transitioned
3910 through the [`legacy_imports`] lint since 1.14, with no known regressions.
3911 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
3913 * [`?Sized` can be used in `where` clauses][37791]
3914 * [There is now a limit on the size of monomorphized types and it can be
3915 modified with the `#![type_size_limit]` crate attribute, similarly to
3916 the `#![recursion_limit]` attribute][37789]
3921 * [On Windows, the compiler will apply dllimport attributes when linking to
3922 extern functions][37973]. Additional attributes and flags can control which
3923 library kind is linked and its name. [RFC 1717].
3924 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
3925 * [The `--test` flag works with procedural macro crates][38107]
3926 * [Fix `extern "aapcs" fn` ABI][37814]
3927 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
3928 * [The `format!` expander recognizes incorrect `printf` and shell-style
3929 formatting directives and suggests the correct format][37613].
3930 * [Only report one error for all unused imports in an import list][37456]
3932 Compiler Performance
3933 --------------------
3935 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
3936 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
3937 * [Don't clone in `UnificationTable::probe`][37848]
3938 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
3939 * [Use small vectors in type walker][37760]
3940 * [Macro expansion performance was improved][37701]
3941 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
3942 * [Replace FNV with a faster hash function][37229]
3947 * [`std::iter::Iterator::min_by`]
3948 * [`std::iter::Iterator::max_by`]
3949 * [`std::os::*::fs::FileExt`]
3950 * [`std::sync::atomic::Atomic*::get_mut`]
3951 * [`std::sync::atomic::Atomic*::into_inner`]
3952 * [`std::vec::IntoIter::as_slice`]
3953 * [`std::vec::IntoIter::as_mut_slice`]
3954 * [`std::sync::mpsc::Receiver::try_iter`]
3955 * [`std::os::unix::process::CommandExt::before_exec`]
3956 * [`std::rc::Rc::strong_count`]
3957 * [`std::rc::Rc::weak_count`]
3958 * [`std::sync::Arc::strong_count`]
3959 * [`std::sync::Arc::weak_count`]
3960 * [`std::char::encode_utf8`]
3961 * [`std::char::encode_utf16`]
3962 * [`std::cell::Ref::clone`]
3963 * [`std::io::Take::into_inner`]
3968 * [The standard sorting algorithm has been rewritten for dramatic performance
3969 improvements][38192]. It is a hybrid merge sort, drawing influences from
3970 Timsort. Previously it was a naive merge sort.
3971 * [`Iterator::nth` no longer has a `Sized` bound][38134]
3972 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
3974 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
3975 and `char_indices().last()`][37882]
3976 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
3977 * [Chinese characters display correctly in `fmt::Debug`][37855]
3978 * [Derive `Default` for `Duration`][37699]
3979 * [Support creation of anonymous pipes on WinXP/2k][37677]
3980 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
3981 * [Don't pass overlapped handles to processes][38835]
3986 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
3987 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
3988 should instead check the variable at runtime with `std::env`. That the value
3989 was set at build time was a bug, and incorrect when cross-compiling. This
3990 change is known to cause breakage.
3991 * [Add `--all` flag to `cargo test`][cargo/3221]
3992 * [Compile statically against the MSVC CRT][cargo/3363]
3993 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
3994 * [Link OpenSSL statically on OSX][cargo/3311]
3995 * [Apply new fingerprinting to build dir outputs][cargo/3310]
3996 * [Test for bad path overrides with summaries][cargo/3336]
3997 * [Require `cargo install --vers` to take a semver version][cargo/3338]
3998 * [Fix retrying crate downloads for network errors][cargo/3348]
3999 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4000 * [Emit more info on --message-format=json][cargo/3319]
4001 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4002 * [Don't ignore errors in workspace manifest][cargo/3409]
4003 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4008 * [Test runners (binaries built with `--test`) now support a `--list` argument
4009 that lists the tests it contains][38185]
4010 * [Test runners now support a `--exact` argument that makes the test filter
4011 match exactly, instead of matching only a substring of the test name][38181]
4012 * [rustdoc supports a `--playground-url` flag][37763]
4013 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4018 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4019 continue to be used in this release by passing `--disable-rustbuild` to the
4020 configure script, but they will be deleted soon. Note that the new build
4021 system uses a different on-disk layout that will likely affect any scripts
4023 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4025 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4026 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4032 * [A number of minor changes to name resolution have been activated][37127].
4033 They add up to more consistent semantics, allowing for future evolution of
4034 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4035 details of what is different. The breaking changes here have been transitioned
4036 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4037 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4038 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4039 should instead check the variable at runtime with `std::env`. That the value
4040 was set at build time was a bug, and incorrect when cross-compiling. This
4041 change is known to cause breakage.
4042 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4043 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4044 1.10 and is now an error by default. It will become a hard error in the near
4046 * [The semantics relating modules to file system directories are changing in
4047 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4048 lint, which is a warning in this release, and will become a hard error in the
4050 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4051 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4052 the underlying iterator][37834]
4054 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4055 [33685]: https://github.com/rust-lang/rust/issues/33685
4056 [36868]: https://github.com/rust-lang/rust/pull/36868
4057 [37127]: https://github.com/rust-lang/rust/pull/37127
4058 [37229]: https://github.com/rust-lang/rust/pull/37229
4059 [37456]: https://github.com/rust-lang/rust/pull/37456
4060 [37527]: https://github.com/rust-lang/rust/pull/37527
4061 [37602]: https://github.com/rust-lang/rust/pull/37602
4062 [37613]: https://github.com/rust-lang/rust/pull/37613
4063 [37615]: https://github.com/rust-lang/rust/pull/37615
4064 [37636]: https://github.com/rust-lang/rust/pull/37636
4065 [37627]: https://github.com/rust-lang/rust/pull/37627
4066 [37642]: https://github.com/rust-lang/rust/pull/37642
4067 [37677]: https://github.com/rust-lang/rust/pull/37677
4068 [37699]: https://github.com/rust-lang/rust/pull/37699
4069 [37701]: https://github.com/rust-lang/rust/pull/37701
4070 [37705]: https://github.com/rust-lang/rust/pull/37705
4071 [37749]: https://github.com/rust-lang/rust/pull/37749
4072 [37760]: https://github.com/rust-lang/rust/pull/37760
4073 [37763]: https://github.com/rust-lang/rust/pull/37763
4074 [37764]: https://github.com/rust-lang/rust/pull/37764
4075 [37789]: https://github.com/rust-lang/rust/pull/37789
4076 [37791]: https://github.com/rust-lang/rust/pull/37791
4077 [37814]: https://github.com/rust-lang/rust/pull/37814
4078 [37817]: https://github.com/rust-lang/rust/pull/37817
4079 [37834]: https://github.com/rust-lang/rust/pull/37834
4080 [37848]: https://github.com/rust-lang/rust/pull/37848
4081 [37855]: https://github.com/rust-lang/rust/pull/37855
4082 [37882]: https://github.com/rust-lang/rust/pull/37882
4083 [37888]: https://github.com/rust-lang/rust/pull/37888
4084 [37973]: https://github.com/rust-lang/rust/pull/37973
4085 [37979]: https://github.com/rust-lang/rust/pull/37979
4086 [38086]: https://github.com/rust-lang/rust/pull/38086
4087 [38107]: https://github.com/rust-lang/rust/pull/38107
4088 [38117]: https://github.com/rust-lang/rust/pull/38117
4089 [38134]: https://github.com/rust-lang/rust/pull/38134
4090 [38146]: https://github.com/rust-lang/rust/pull/38146
4091 [38181]: https://github.com/rust-lang/rust/pull/38181
4092 [38182]: https://github.com/rust-lang/rust/pull/38182
4093 [38185]: https://github.com/rust-lang/rust/pull/38185
4094 [38192]: https://github.com/rust-lang/rust/pull/38192
4095 [38279]: https://github.com/rust-lang/rust/pull/38279
4096 [38835]: https://github.com/rust-lang/rust/pull/38835
4097 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4098 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4099 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4100 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4101 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4102 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4103 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4104 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4105 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4106 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4107 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4108 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4109 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4110 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4111 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4112 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4113 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4114 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4115 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4116 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4117 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4118 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4119 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4120 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4121 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4122 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4123 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4124 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4125 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4126 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4127 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4128 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4129 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4130 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4131 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4132 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4133 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4134 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4137 Version 1.14.0 (2016-12-22)
4138 ===========================
4143 * [`..` matches multiple tuple fields in enum variants, structs
4144 and tuples][36843]. [RFC 1492].
4145 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4146 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4147 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4148 dereferencing][36822]
4153 * [Mark enums with non-zero discriminant as non-zero][37224]
4154 * [Lower-case `static mut` names are linted like other
4155 statics and consts][37162]
4156 * [Fix ICE on some macros in const integer positions
4157 (e.g. `[u8; m!()]`)][36819]
4158 * [Improve error message and snippet for "did you mean `x`"][36798]
4159 * [Add a panic-strategy field to the target specification][36794]
4160 * [Include LLVM version in `--version --verbose`][37200]
4162 Compile-time Optimizations
4163 --------------------------
4165 * [Improve macro expansion performance][37569]
4166 * [Shrink `Expr_::ExprInlineAsm`][37445]
4167 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4168 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4169 * [Avoid more allocations when compiling html5ever][37373]
4170 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4171 * [Avoid some allocations in the macro parser][37318]
4172 * [Use a faster deflate setting][37298]
4173 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4174 during interning of slices][37270]
4175 * [Optimize `write_metadata`][37267]
4176 * [Don't process obligation forest cycles when stalled][37231]
4177 * [Avoid many `CrateConfig` clones][37161]
4178 * [Optimize `Substs::super_fold_with`][37108]
4179 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4180 * [Speed up `plug_leaks`][36917]
4185 * [`println!()`, with no arguments, prints newline][36825].
4186 Previously, an empty string was required to achieve the same.
4187 * [`Wrapping` impls standard binary and unary operators, as well as
4188 the `Sum` and `Product` iterators][37356]
4189 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4191 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4192 `VecDeque` iterators][37315]
4193 * [Improve `SipHasher` performance on small values][37312]
4194 * [Add Iterator trait TrustedLen to enable better FromIterator /
4196 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4197 * [`ReadDir` implements `Debug`][37221]
4198 * [Implement `RefUnwindSafe` for atomic types][37178]
4199 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4200 * [Avoid allocations in `Decoder::read_str`][37064]
4201 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4202 * [Impl `Debug` for raw pointers to unsized data][36880]
4203 * [Don't reuse `HashMap` random seeds][37470]
4204 * [The internal memory layout of `HashMap` is more cache-friendly, for
4205 significant improvements in some operations][36692]
4206 * [`HashMap` uses less memory on 32-bit architectures][36595]
4207 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4212 * [Expose rustc cfg values to build scripts][cargo/3243]
4213 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4214 * [Fix passing --features when testing multiple packages][cargo/3280]
4215 * [Use a single profile set per workspace][cargo/3249]
4216 * [Load `replace` sections from lock files][cargo/3220]
4217 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4222 * [rustup is the recommended Rust installation method][1.14rustup]
4223 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4224 S390x. These are [tier 2] platforms and may have major defects. Follow the
4225 instructions on the website to install, or add the targets to an existing
4226 installation with `rustup target add`. The new target triples are:
4227 - `mips-unknown-linux-gnu`
4228 - `mipsel-unknown-linux-gnu`
4229 - `mips64-unknown-linux-gnuabi64`
4230 - `mips64el-unknown-linux-gnuabi64 `
4231 - `powerpc-unknown-linux-gnu`
4232 - `powerpc64-unknown-linux-gnu`
4233 - `powerpc64le-unknown-linux-gnu`
4234 - `s390x-unknown-linux-gnu `
4235 * This release includes target (std) builds for ARM Linux running MUSL
4236 libc. These are [tier 2] platforms and may have major defects. Add the
4237 following triples to an existing rustup installation with `rustup target add`:
4238 - `arm-unknown-linux-musleabi`
4239 - `arm-unknown-linux-musleabihf`
4240 - `armv7-unknown-linux-musleabihf`
4241 * This release includes [experimental support for WebAssembly][1.14wasm], via
4242 the `wasm32-unknown-emscripten` target. This target is known to have major
4243 defects. Please test, report, and fix.
4244 * rustup no longer installs documentation by default. Run `rustup
4245 component add rust-docs` to install.
4246 * [Fix line stepping in debugger][37310]
4247 * [Enable line number debuginfo in releases][37280]
4252 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4253 * [Add support for Fuchsia OS][37313]
4254 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4259 * [A number of forward-compatibility lints used by the compiler
4260 to gradually introduce language changes have been converted
4261 to deny by default][36894]:
4262 - ["use of inaccessible extern crate erroneously allowed"][36886]
4263 - ["type parameter default erroneously allowed in invalid location"][36887]
4264 - ["detects super or self keywords at the beginning of global path"][36888]
4265 - ["two overlapping inherent impls define an item with the same name
4266 were erroneously allowed"][36889]
4267 - ["floating-point constants cannot be used in patterns"][36890]
4268 - ["constants of struct or enum type can only be used in a pattern if
4269 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4270 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4271 * [Prohibit patterns in trait methods without bodies][37378]
4272 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4273 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4274 * [The `$crate` macro variable is accepted in fewer locations][37213]
4275 * [Impls specifying extra region requirements beyond the trait
4276 they implement are rejected][37167]
4277 * [Enums may not be unsized][37111]. Unsized enums are intended to
4278 work but never have. For now they are forbidden.
4279 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4281 [tier 2]: https://forge.rust-lang.org/platform-support.html
4282 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4283 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4284 [36430]: https://github.com/rust-lang/rust/pull/36430
4285 [36595]: https://github.com/rust-lang/rust/pull/36595
4286 [36595]: https://github.com/rust-lang/rust/pull/36595
4287 [36692]: https://github.com/rust-lang/rust/pull/36692
4288 [36767]: https://github.com/rust-lang/rust/pull/36767
4289 [36794]: https://github.com/rust-lang/rust/pull/36794
4290 [36798]: https://github.com/rust-lang/rust/pull/36798
4291 [36819]: https://github.com/rust-lang/rust/pull/36819
4292 [36822]: https://github.com/rust-lang/rust/pull/36822
4293 [36825]: https://github.com/rust-lang/rust/pull/36825
4294 [36843]: https://github.com/rust-lang/rust/pull/36843
4295 [36880]: https://github.com/rust-lang/rust/pull/36880
4296 [36886]: https://github.com/rust-lang/rust/issues/36886
4297 [36887]: https://github.com/rust-lang/rust/issues/36887
4298 [36888]: https://github.com/rust-lang/rust/issues/36888
4299 [36889]: https://github.com/rust-lang/rust/issues/36889
4300 [36890]: https://github.com/rust-lang/rust/issues/36890
4301 [36891]: https://github.com/rust-lang/rust/issues/36891
4302 [36892]: https://github.com/rust-lang/rust/issues/36892
4303 [36894]: https://github.com/rust-lang/rust/pull/36894
4304 [36917]: https://github.com/rust-lang/rust/pull/36917
4305 [36993]: https://github.com/rust-lang/rust/pull/36993
4306 [37037]: https://github.com/rust-lang/rust/pull/37037
4307 [37064]: https://github.com/rust-lang/rust/pull/37064
4308 [37094]: https://github.com/rust-lang/rust/pull/37094
4309 [37108]: https://github.com/rust-lang/rust/pull/37108
4310 [37111]: https://github.com/rust-lang/rust/pull/37111
4311 [37161]: https://github.com/rust-lang/rust/pull/37161
4312 [37162]: https://github.com/rust-lang/rust/pull/37162
4313 [37167]: https://github.com/rust-lang/rust/pull/37167
4314 [37178]: https://github.com/rust-lang/rust/pull/37178
4315 [37200]: https://github.com/rust-lang/rust/pull/37200
4316 [37213]: https://github.com/rust-lang/rust/pull/37213
4317 [37221]: https://github.com/rust-lang/rust/pull/37221
4318 [37224]: https://github.com/rust-lang/rust/pull/37224
4319 [37230]: https://github.com/rust-lang/rust/pull/37230
4320 [37231]: https://github.com/rust-lang/rust/pull/37231
4321 [37247]: https://github.com/rust-lang/rust/pull/37247
4322 [37267]: https://github.com/rust-lang/rust/pull/37267
4323 [37270]: https://github.com/rust-lang/rust/pull/37270
4324 [37273]: https://github.com/rust-lang/rust/pull/37273
4325 [37280]: https://github.com/rust-lang/rust/pull/37280
4326 [37298]: https://github.com/rust-lang/rust/pull/37298
4327 [37306]: https://github.com/rust-lang/rust/pull/37306
4328 [37310]: https://github.com/rust-lang/rust/pull/37310
4329 [37312]: https://github.com/rust-lang/rust/pull/37312
4330 [37313]: https://github.com/rust-lang/rust/pull/37313
4331 [37315]: https://github.com/rust-lang/rust/pull/37315
4332 [37318]: https://github.com/rust-lang/rust/pull/37318
4333 [37322]: https://github.com/rust-lang/rust/pull/37322
4334 [37326]: https://github.com/rust-lang/rust/pull/37326
4335 [37351]: https://github.com/rust-lang/rust/pull/37351
4336 [37356]: https://github.com/rust-lang/rust/pull/37356
4337 [37367]: https://github.com/rust-lang/rust/pull/37367
4338 [37373]: https://github.com/rust-lang/rust/pull/37373
4339 [37378]: https://github.com/rust-lang/rust/pull/37378
4340 [37389]: https://github.com/rust-lang/rust/pull/37389
4341 [37392]: https://github.com/rust-lang/rust/pull/37392
4342 [37427]: https://github.com/rust-lang/rust/pull/37427
4343 [37439]: https://github.com/rust-lang/rust/pull/37439
4344 [37445]: https://github.com/rust-lang/rust/pull/37445
4345 [37470]: https://github.com/rust-lang/rust/pull/37470
4346 [37569]: https://github.com/rust-lang/rust/pull/37569
4347 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4348 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4349 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4350 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4351 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4352 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4353 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
4356 Version 1.13.0 (2016-11-10)
4357 ===========================
4362 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
4363 errors, like the `try!` macro, described in [RFC 0243].
4364 * [Stabilize macros in type position][36014]. Described in [RFC 873].
4365 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
4366 * [Fix `#[derive]` for empty tuple structs/variants][35728]
4367 * [Fix lifetime rules for 'if' conditions][36029]
4368 * [Avoid loading and parsing unconfigured non-inline modules][36482]
4373 * [Add the `-C link-arg` argument][36574]
4374 * [Remove the old AST-based backend from rustc_trans][35764]
4375 * [Don't enable NEON by default on armv7 Linux][35814]
4376 * [Fix debug line number info for macro expansions][35238]
4377 * [Do not emit "class method" debuginfo for types that are not
4378 DICompositeType][36008]
4379 * [Warn about multiple conflicting #[repr] hints][34623]
4380 * [When sizing DST, don't double-count nested struct prefixes][36351]
4381 * [Default RUST_MIN_STACK to 16MiB for now][36505]
4382 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
4383 * [Reject macros with empty repetitions to avoid infinite loop][36721]
4384 * [Expand macros without recursing to avoid stack overflows][36214]
4389 * [Replace macro backtraces with labeled local uses][35702]
4390 * [Improve error message for misplaced doc comments][33922]
4391 * [Buffer unix and lock windows to prevent message interleaving][35975]
4392 * [Update lifetime errors to specifically note temporaries][36171]
4393 * [Special case a few colors for Windows][36178]
4394 * [Suggest `use self` when such an import resolves][36289]
4395 * [Be more specific when type parameter shadows primitive type][36338]
4396 * Many minor improvements
4398 Compile-time Optimizations
4399 --------------------------
4401 * [Compute and cache HIR hashes at beginning][35854]
4402 * [Don't hash types in loan paths][36004]
4403 * [Cache projections in trans][35761]
4404 * [Optimize the parser's last token handling][36527]
4405 * [Only instantiate #[inline] functions in codegen units referencing
4406 them][36524]. This leads to big improvements in cases where crates export
4407 define many inline functions without using them directly.
4408 * [Lazily allocate TypedArena's first chunk][36592]
4409 * [Don't allocate during default HashSet creation][36734]
4416 * [`overflowing_abs`]
4417 * [`RefCell::try_borrow`]
4418 * [`RefCell::try_borrow_mut`]
4423 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
4424 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
4426 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
4427 * [Implement `Debug` for `std::vec::IntoIter`][35707]
4428 * [`CString`: avoid excessive growth just to 0-terminate][35871]
4429 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
4430 * [Use arc4rand on FreeBSD][35884]
4431 * [memrchr: Correct aligned offset computation][35969]
4432 * [Improve Demangling of Rust Symbols][36059]
4433 * [Use monotonic time in condition variables][35048]
4434 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
4435 * [Implement conversion traits for `char`][35755]
4436 * [Fix illegal instruction caused by overflow in channel cloning][36104]
4437 * [Zero first byte of CString on drop][36264]
4438 * [Inherit overflow checks for sum and product][36372]
4439 * [Add missing Eq implementations][36423]
4440 * [Implement `Debug` for `DirEntry`][36631]
4441 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
4443 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4444 * [Implement more traits for `std::io::ErrorKind`][35911]
4445 * [Optimize BinaryHeap bounds checking][36072]
4446 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
4447 `extend_with_element`][36355]
4448 * [Fix overflow checking in unsigned pow()][34942]
4453 * This release includes security fixes to both curl and OpenSSL.
4454 * [Fix transitive doctests when panic=abort][cargo/3021]
4455 * [Add --all-features flag to cargo][cargo/3038]
4456 * [Reject path-based dependencies in `cargo package`][cargo/3060]
4457 * [Don't parse the home directory more than once][cargo/3078]
4458 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
4459 * [Update OpenSSL to 1.0.2j][cargo/3121]
4460 * [Add license and license_file to cargo metadata output][cargo/3110]
4461 * [Make crates-io registry URL optional in config; ignore all changes to
4462 source.crates-io][cargo/3089]
4463 * [Don't download dependencies from other platforms][cargo/3123]
4464 * [Build transitive dev-dependencies when needed][cargo/3125]
4465 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
4466 * [Avoid updating registry when adding existing deps][cargo/3144]
4467 * [Warn about path overrides that won't work][cargo/3136]
4468 * [Use workspaces during `cargo install`][cargo/3146]
4469 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
4470 * [Add --message-format flag][cargo/3000]
4471 * [Pass target environment for rustdoc][cargo/3205]
4472 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
4473 * [Update curl and curl-sys][cargo/3241]
4474 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
4479 * [rustdoc: Add the `--sysroot` argument][36586]
4480 * [rustdoc: Fix a couple of issues with the search results][35655]
4481 * [rustdoc: remove the `!` from macro URLs and titles][35234]
4482 * [gdb: Fix pretty-printing special-cased Rust types][35585]
4483 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
4488 * [Remove unmaintained style guide][35124]
4489 * [Add s390x support][36369]
4490 * [Initial work at Haiku OS support][36727]
4491 * [Add mips-uclibc targets][35734]
4492 * [Crate-ify compiler-rt into compiler-builtins][35021]
4493 * [Add rustc version info (git hash + date) to dist tarball][36213]
4494 * Many documentation improvements
4499 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
4500 * [Deny (by default) transmuting from fn item types to pointer-sized
4501 types][34923]. Continuing the long transition to zero-sized fn items,
4503 * [Fix `#[derive]` for empty tuple structs/variants][35728].
4505 * [Issue deprecation warnings for safe accesses to extern statics][36173]
4506 * [Fix lifetime rules for 'if' conditions][36029].
4507 * [Inherit overflow checks for sum and product][36372].
4508 * [Forbid user-defined macros named "macro_rules"][36730].
4510 [33922]: https://github.com/rust-lang/rust/pull/33922
4511 [34623]: https://github.com/rust-lang/rust/pull/34623
4512 [34923]: https://github.com/rust-lang/rust/pull/34923
4513 [34942]: https://github.com/rust-lang/rust/pull/34942
4514 [34982]: https://github.com/rust-lang/rust/pull/34982
4515 [35021]: https://github.com/rust-lang/rust/pull/35021
4516 [35048]: https://github.com/rust-lang/rust/pull/35048
4517 [35074]: https://github.com/rust-lang/rust/pull/35074
4518 [35124]: https://github.com/rust-lang/rust/pull/35124
4519 [35234]: https://github.com/rust-lang/rust/pull/35234
4520 [35238]: https://github.com/rust-lang/rust/pull/35238
4521 [35354]: https://github.com/rust-lang/rust/pull/35354
4522 [35559]: https://github.com/rust-lang/rust/pull/35559
4523 [35585]: https://github.com/rust-lang/rust/pull/35585
4524 [35627]: https://github.com/rust-lang/rust/pull/35627
4525 [35655]: https://github.com/rust-lang/rust/pull/35655
4526 [35702]: https://github.com/rust-lang/rust/pull/35702
4527 [35707]: https://github.com/rust-lang/rust/pull/35707
4528 [35728]: https://github.com/rust-lang/rust/pull/35728
4529 [35734]: https://github.com/rust-lang/rust/pull/35734
4530 [35755]: https://github.com/rust-lang/rust/pull/35755
4531 [35761]: https://github.com/rust-lang/rust/pull/35761
4532 [35764]: https://github.com/rust-lang/rust/pull/35764
4533 [35814]: https://github.com/rust-lang/rust/pull/35814
4534 [35854]: https://github.com/rust-lang/rust/pull/35854
4535 [35871]: https://github.com/rust-lang/rust/pull/35871
4536 [35884]: https://github.com/rust-lang/rust/pull/35884
4537 [35911]: https://github.com/rust-lang/rust/pull/35911
4538 [35969]: https://github.com/rust-lang/rust/pull/35969
4539 [35975]: https://github.com/rust-lang/rust/pull/35975
4540 [36004]: https://github.com/rust-lang/rust/pull/36004
4541 [36008]: https://github.com/rust-lang/rust/pull/36008
4542 [36014]: https://github.com/rust-lang/rust/pull/36014
4543 [36029]: https://github.com/rust-lang/rust/pull/36029
4544 [36059]: https://github.com/rust-lang/rust/pull/36059
4545 [36072]: https://github.com/rust-lang/rust/pull/36072
4546 [36101]: https://github.com/rust-lang/rust/pull/36101
4547 [36104]: https://github.com/rust-lang/rust/pull/36104
4548 [36171]: https://github.com/rust-lang/rust/pull/36171
4549 [36173]: https://github.com/rust-lang/rust/pull/36173
4550 [36178]: https://github.com/rust-lang/rust/pull/36178
4551 [36213]: https://github.com/rust-lang/rust/pull/36213
4552 [36214]: https://github.com/rust-lang/rust/pull/36214
4553 [36264]: https://github.com/rust-lang/rust/pull/36264
4554 [36266]: https://github.com/rust-lang/rust/pull/36266
4555 [36289]: https://github.com/rust-lang/rust/pull/36289
4556 [36338]: https://github.com/rust-lang/rust/pull/36338
4557 [36351]: https://github.com/rust-lang/rust/pull/36351
4558 [36355]: https://github.com/rust-lang/rust/pull/36355
4559 [36369]: https://github.com/rust-lang/rust/pull/36369
4560 [36372]: https://github.com/rust-lang/rust/pull/36372
4561 [36423]: https://github.com/rust-lang/rust/pull/36423
4562 [36482]: https://github.com/rust-lang/rust/pull/36482
4563 [36505]: https://github.com/rust-lang/rust/pull/36505
4564 [36524]: https://github.com/rust-lang/rust/pull/36524
4565 [36527]: https://github.com/rust-lang/rust/pull/36527
4566 [36551]: https://github.com/rust-lang/rust/pull/36551
4567 [36574]: https://github.com/rust-lang/rust/pull/36574
4568 [36586]: https://github.com/rust-lang/rust/pull/36586
4569 [36592]: https://github.com/rust-lang/rust/pull/36592
4570 [36631]: https://github.com/rust-lang/rust/pull/36631
4571 [36639]: https://github.com/rust-lang/rust/pull/36639
4572 [36721]: https://github.com/rust-lang/rust/pull/36721
4573 [36727]: https://github.com/rust-lang/rust/pull/36727
4574 [36730]: https://github.com/rust-lang/rust/pull/36730
4575 [36734]: https://github.com/rust-lang/rust/pull/36734
4576 [36754]: https://github.com/rust-lang/rust/pull/36754
4577 [36995]: https://github.com/rust-lang/rust/pull/36995
4578 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
4579 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
4580 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4581 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
4582 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
4583 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
4584 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
4585 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
4586 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
4587 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
4588 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
4589 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
4590 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
4591 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
4592 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
4593 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
4594 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
4595 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
4596 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
4597 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
4598 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
4599 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
4600 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
4601 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
4602 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
4603 [rustup]: https://www.rustup.rs
4604 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
4605 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
4606 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
4607 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
4608 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
4609 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
4610 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
4613 Version 1.12.1 (2016-10-20)
4614 ===========================
4619 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
4620 * [Confusion with double negation and booleans][36856]
4621 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
4622 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
4623 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
4624 * [Corrupted memory after updated to 1.12][36936]
4625 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
4626 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
4627 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
4629 [36381]: https://github.com/rust-lang/rust/issues/36381
4630 [36856]: https://github.com/rust-lang/rust/issues/36856
4631 [36875]: https://github.com/rust-lang/rust/issues/36875
4632 [36924]: https://github.com/rust-lang/rust/issues/36924
4633 [36926]: https://github.com/rust-lang/rust/issues/36926
4634 [36936]: https://github.com/rust-lang/rust/issues/36936
4635 [37026]: https://github.com/rust-lang/rust/issues/37026
4636 [37112]: https://github.com/rust-lang/rust/issues/37112
4637 [37153]: https://github.com/rust-lang/rust/issues/37153
4640 Version 1.12.0 (2016-09-29)
4641 ===========================
4646 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4647 This translation pass is far simpler than the previous AST->LLVM pass, and
4648 creates opportunities to perform new optimizations directly on the MIR. It
4649 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4650 * [`rustc` presents a new, more readable error format, along with
4651 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4652 Most common editors supporting Rust have been updated to work with it. It was
4653 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4658 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
4659 This translation pass is far simpler than the previous AST->LLVM pass, and
4660 creates opportunities to perform new optimizations directly on the MIR. It
4661 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
4662 * [Print the Rust target name, not the LLVM target name, with
4663 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
4664 * [The computation of `TypeId` is correct in some cases where it was previously
4665 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
4666 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
4667 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
4668 `--print relocation-models`, and `--print code-models` print the available
4669 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
4670 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
4671 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
4672 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
4673 These targets produce statically-linked binaries. There are no binary release
4679 * [`rustc` presents a new, more readable error format, along with
4680 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
4681 Most common editors supporting Rust have been updated to work with it. It was
4682 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
4683 * [In error descriptions, references are now described in plain English,
4684 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
4685 * [In error type descriptions, unknown numeric types are named `{integer}` or
4686 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
4687 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
4692 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
4693 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
4694 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
4695 useful](https://github.com/rust-lang/rust/pull/34908)
4696 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
4697 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
4698 * [Semicolons are properly required as statement delimiters inside
4699 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
4700 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4705 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
4706 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
4707 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
4708 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
4709 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
4710 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
4711 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
4712 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
4713 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
4714 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
4715 Both on Unix and Windows.
4716 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
4717 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
4718 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
4719 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
4720 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
4721 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
4722 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
4723 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
4728 * [The `format!` macro and friends now allow a single argument to be formatted
4729 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
4730 * [The lifetime bounds on `[T]::binary_search_by` and
4731 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
4732 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
4733 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
4734 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
4735 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
4736 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
4737 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
4738 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
4739 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
4740 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
4741 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
4742 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
4743 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
4744 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
4745 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
4746 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
4747 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
4748 * [`mpsc::sync_channel` `Receiver`s return any available message before
4749 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
4750 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
4751 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
4756 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
4757 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
4758 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
4759 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
4760 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
4761 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
4762 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
4763 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
4764 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
4765 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
4766 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
4767 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
4768 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
4769 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
4770 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
4771 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
4776 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
4777 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
4782 * [Test binaries now support a `--test-threads` argument to specify the number
4783 of threads used to run tests, and which acts the same as the
4784 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
4785 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
4786 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
4787 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4788 * [Rust releases now come with source packages that can be installed by rustup
4789 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
4790 The resulting source code can be used by tools and IDES, located in the
4791 sysroot under `lib/rustlib/src`.
4796 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
4797 * Many minor improvements to the documentation.
4798 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
4803 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
4804 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
4805 * [When formatting strings, if "precision" is specified, the "fill",
4806 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
4807 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
4810 Version 1.11.0 (2016-08-18)
4811 ===========================
4816 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
4817 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
4818 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
4819 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
4820 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
4825 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
4826 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
4827 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
4828 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
4829 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
4830 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
4831 (in libcore - previously stabilized in libstd)
4832 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
4833 (in libcore - previously stabilized in libstd)
4834 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
4835 (in libcore - previously stabilized in libstd)
4836 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
4837 (in libcore - previously stabilized in libstd)
4838 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4839 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
4840 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
4841 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
4846 * [The `thread_local!` macro supports multiple definitions in a single
4847 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
4848 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
4849 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
4850 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
4851 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
4852 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
4853 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
4854 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
4859 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
4860 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
4861 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
4862 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
4863 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
4864 and `-vv` prints warnings for all crates.
4865 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
4866 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
4867 This provides room for expansion by arbitrary tools.
4868 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
4869 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
4870 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
4871 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
4872 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
4873 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
4874 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
4879 * [Caching projections speeds up type check dramatically for some
4880 workloads](https://github.com/rust-lang/rust/pull/33816)
4881 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
4882 This hasher is faster, but is believed to provide sufficient
4883 protection from collision attacks.
4884 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
4889 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
4890 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
4891 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
4892 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
4893 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
4898 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
4899 * [When emitting debug info, rustc emits frame pointers for closures,
4900 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
4901 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
4902 * Many more errors have been given error codes and extended
4904 * API documentation continues to be improved, with many new examples
4909 * [rustc no longer hangs when dependencies recursively re-export
4910 submodules](https://github.com/rust-lang/rust/pull/34542)
4911 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
4912 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
4913 rewritten](https://github.com/rust-lang/rust/pull/33895)
4914 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
4915 No targets use this yet, but it works toward AVR support.
4920 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
4921 * [The new follow-set rules that place restrictions on `macro_rules!`
4922 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
4923 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
4924 and has been a warning since 1.10.
4925 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
4926 This causes breakage in some corner cases.
4929 Version 1.10.0 (2016-07-07)
4930 ===========================
4935 * [Allow `concat_idents!` in type positions as well as in expression
4936 positions](https://github.com/rust-lang/rust/pull/33735).
4937 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
4938 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
4939 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
4940 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
4941 * [`panic!` can be converted to a runtime abort with the
4942 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
4943 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
4944 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
4945 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
4946 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
4947 Note that Cargo does not yet directly support cdylibs.
4952 * `os::windows::fs::OpenOptionsExt::access_mode`
4953 * `os::windows::fs::OpenOptionsExt::share_mode`
4954 * `os::windows::fs::OpenOptionsExt::custom_flags`
4955 * `os::windows::fs::OpenOptionsExt::attributes`
4956 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
4957 * `os::unix::fs::OpenOptionsExt::custom_flags`
4958 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
4959 * `Default for sync::Weak`
4960 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
4961 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
4962 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
4963 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
4964 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
4965 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
4966 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
4967 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
4968 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
4969 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
4970 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
4971 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
4972 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
4973 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
4974 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
4975 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
4976 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
4977 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
4978 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
4979 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
4980 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
4981 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
4982 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
4983 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
4984 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
4985 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4986 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4987 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
4988 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
4989 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
4990 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
4991 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
4992 * Read/Write/RawFd impls for `UnixStream`
4993 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
4994 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
4995 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
4996 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
4997 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
4998 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
4999 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5000 * RawFd impls for `UnixListener`
5001 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5002 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5003 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5004 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5005 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5006 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5007 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5008 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5009 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5010 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5011 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5012 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5013 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5014 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5015 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5016 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5017 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5018 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5019 * RawFd impls for `UnixDatagram`
5020 * `{BTree,Hash}Map::values_mut`
5021 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5026 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5027 The semantics of this minor method are subtle and probably not what
5029 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5030 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5031 will fall back to `/dev/urandom` temporarily to avoid blocking
5032 during early boot](https://github.com/rust-lang/rust/pull/33086).
5033 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5034 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5035 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5036 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5037 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5038 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5039 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5043 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5044 This controls the runtime behavior of the `panic!` macro
5045 and can be either "unwind" (the default), or "abort".
5046 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5047 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5048 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5049 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5050 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5051 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5052 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5053 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5054 By default they are retried twice, which can be customized with the
5055 `net.retry` value in `.cargo/config`.
5056 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5057 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5058 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5059 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5060 Makes it possible to install multiple crates in parallel.
5061 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5062 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5063 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5064 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5065 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5066 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5071 * [rustc memory usage was reduced by refactoring the context used for
5072 type checking](https://github.com/rust-lang/rust/pull/33425).
5073 * [Speed up creation of `HashMap`s by caching the random keys used
5074 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5075 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5076 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5077 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5078 10x faster than the previous lookup tables.
5079 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5084 * Many incremental improvements to documentation and rustdoc.
5085 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5086 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5087 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5088 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5089 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5090 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5091 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5096 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5097 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5098 * [`std` no longer prints backtraces on platforms where the running
5099 module must be loaded with `env::current_exe`, which can't be relied
5100 on](https://github.com/rust-lang/rust/pull/33554).
5101 * This release includes std binaries for the i586-unknown-linux-gnu,
5102 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5103 i586 target is for old x86 hardware without SSE2, and the armv7
5104 target is for Android running on modern ARM architectures.
5105 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5106 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5107 * [On Unix the runtime aborts by calling `libc::abort` instead of
5108 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5109 * [Rust is now bootstrapped from the previous release of Rust,
5110 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5115 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5116 * [`target_env` for Linux ARM targets is just `gnu`, not
5117 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5118 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5119 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5120 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5121 Affects how macros are parsed.
5122 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5123 * [Feature-gated attributes on macro-generated macro invocations are
5124 now rejected](https://github.com/rust-lang/rust/pull/32791).
5125 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5126 This caused some minor changes to type inference.
5129 Version 1.9.0 (2016-05-26)
5130 ==========================
5135 * The `#[deprecated]` attribute when applied to an API will generate
5136 warnings when used. The warnings may be suppressed with
5137 `#[allow(deprecated)]`. [RFC 1270].
5138 * [`fn` item types are zero sized, and each `fn` names a unique
5139 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5140 `transmute` on a `fn` type will generate a warning for a few cycles,
5141 then will be converted to an error.
5142 * [Field and method resolution understand visibility, so private
5143 fields and methods cannot prevent the proper use of public fields
5144 and methods][1.9fv].
5145 * [The parser considers unicode codepoints in the
5146 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5152 * [`std::panic::catch_unwind`] (renamed from `recover`)
5153 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5154 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5155 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5156 * [`str::is_char_boundary`]
5157 * [`<*const T>::as_ref`]
5158 * [`<*mut T>::as_ref`]
5159 * [`<*mut T>::as_mut`]
5160 * [`AsciiExt::make_ascii_uppercase`]
5161 * [`AsciiExt::make_ascii_lowercase`]
5162 * [`char::decode_utf16`]
5163 * [`char::DecodeUtf16`]
5164 * [`char::DecodeUtf16Error`]
5165 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5166 * [`BTreeSet::take`]
5167 * [`BTreeSet::replace`]
5170 * [`HashSet::replace`]
5172 * [`OsString::with_capacity`]
5173 * [`OsString::clear`]
5174 * [`OsString::capacity`]
5175 * [`OsString::reserve`]
5176 * [`OsString::reserve_exact`]
5177 * [`OsStr::is_empty`]
5179 * [`std::os::unix::thread`]
5182 * [`JoinHandleExt::as_pthread_t`]
5183 * [`JoinHandleExt::into_pthread_t`]
5184 * [`HashSet::hasher`]
5185 * [`HashMap::hasher`]
5186 * [`CommandExt::exec`]
5187 * [`File::try_clone`]
5188 * [`SocketAddr::set_ip`]
5189 * [`SocketAddr::set_port`]
5190 * [`SocketAddrV4::set_ip`]
5191 * [`SocketAddrV4::set_port`]
5192 * [`SocketAddrV6::set_ip`]
5193 * [`SocketAddrV6::set_port`]
5194 * [`SocketAddrV6::set_flowinfo`]
5195 * [`SocketAddrV6::set_scope_id`]
5196 * [`slice::copy_from_slice`]
5197 * [`ptr::read_volatile`]
5198 * [`ptr::write_volatile`]
5199 * [`OpenOptions::create_new`]
5200 * [`TcpStream::set_nodelay`]
5201 * [`TcpStream::nodelay`]
5202 * [`TcpStream::set_ttl`]
5203 * [`TcpStream::ttl`]
5204 * [`TcpStream::set_only_v6`]
5205 * [`TcpStream::only_v6`]
5206 * [`TcpStream::take_error`]
5207 * [`TcpStream::set_nonblocking`]
5208 * [`TcpListener::set_ttl`]
5209 * [`TcpListener::ttl`]
5210 * [`TcpListener::set_only_v6`]
5211 * [`TcpListener::only_v6`]
5212 * [`TcpListener::take_error`]
5213 * [`TcpListener::set_nonblocking`]
5214 * [`UdpSocket::set_broadcast`]
5215 * [`UdpSocket::broadcast`]
5216 * [`UdpSocket::set_multicast_loop_v4`]
5217 * [`UdpSocket::multicast_loop_v4`]
5218 * [`UdpSocket::set_multicast_ttl_v4`]
5219 * [`UdpSocket::multicast_ttl_v4`]
5220 * [`UdpSocket::set_multicast_loop_v6`]
5221 * [`UdpSocket::multicast_loop_v6`]
5222 * [`UdpSocket::set_multicast_ttl_v6`]
5223 * [`UdpSocket::multicast_ttl_v6`]
5224 * [`UdpSocket::set_ttl`]
5225 * [`UdpSocket::ttl`]
5226 * [`UdpSocket::set_only_v6`]
5227 * [`UdpSocket::only_v6`]
5228 * [`UdpSocket::join_multicast_v4`]
5229 * [`UdpSocket::join_multicast_v6`]
5230 * [`UdpSocket::leave_multicast_v4`]
5231 * [`UdpSocket::leave_multicast_v6`]
5232 * [`UdpSocket::take_error`]
5233 * [`UdpSocket::connect`]
5234 * [`UdpSocket::send`]
5235 * [`UdpSocket::recv`]
5236 * [`UdpSocket::set_nonblocking`]
5241 * [`std::sync::Once` is poisoned if its initialization function
5243 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5244 * [Most types implement `fmt::Debug`][1.9db].
5245 * [The default buffer size used by `BufReader` and `BufWriter` was
5246 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5247 used by other languages.
5248 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5249 `Duration` additionally implements `*=` and `/=`][1.9ta].
5250 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5251 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5252 * [`Chain` implements `BufRead`][1.9ch].
5253 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5258 * [Cargo can now run concurrently][1.9cc].
5259 * [Top-level overrides allow specific revisions of crates to be
5260 overridden through the entire crate graph][1.9ct]. This is intended
5261 to make upgrades easier for large projects, by allowing crates to be
5262 forked temporarily until they've been upgraded and republished.
5263 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5264 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5265 on the commandline][1.9cf]. `rustc` arguments can also be specified
5266 in the `build.rustflags` configuration key.
5271 * [The time complexity of comparing variables for equivalence during type
5272 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5273 to major compilation time improvement in some scenarios.
5274 * [`ToString` is specialized for `str`, giving it the same performance
5275 as `to_owned`][1.9ts].
5276 * [Spawning processes with `Command::output` no longer creates extra
5278 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5279 for C-like enums][1.9cl].
5284 * [Passing the `--quiet` flag to a test runner will produce
5285 much-abbreviated output][1.9q].
5286 * The Rust Project now publishes std binaries for the
5287 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5288 `i586-pc-windows-msvc` targets.
5293 * [`std::sync::Once` is poisoned if its initialization function
5295 * [It is illegal to define methods with the same name in overlapping
5296 inherent `impl` blocks][1.9sn].
5297 * [`fn` item types are zero sized, and each `fn` names a unique
5298 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5299 `transmute` on a `fn` type will generate a warning for a few cycles,
5300 then will be converted to an error.
5301 * [Improvements to const evaluation may trigger new errors when integer
5302 literals are out of range][1.9ce].
5305 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5306 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5307 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5308 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5309 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5310 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5311 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5312 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5313 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5314 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5315 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5316 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5317 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5318 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5319 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5320 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5321 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5322 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5323 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5324 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5325 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5326 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5327 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5328 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5329 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5330 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5331 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5332 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5333 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5334 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5335 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5336 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5337 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5338 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5339 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5340 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5341 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5342 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5343 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5344 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5345 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5346 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5347 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5348 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5349 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5350 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5351 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5352 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5353 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5354 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5355 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5356 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
5357 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
5358 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
5359 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
5360 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
5361 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
5362 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
5363 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
5364 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
5365 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5366 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5367 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5368 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5369 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5370 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5371 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
5372 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
5373 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
5374 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
5375 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
5376 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
5377 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
5378 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
5379 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
5380 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
5381 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
5382 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
5383 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
5384 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
5385 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
5386 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
5387 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
5388 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
5389 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
5390 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
5391 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
5392 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
5393 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
5394 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
5395 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
5396 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
5397 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
5398 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
5399 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
5400 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
5401 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
5402 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
5403 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
5404 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
5405 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
5406 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
5407 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
5408 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
5409 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
5410 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
5411 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
5412 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
5413 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
5414 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
5417 Version 1.8.0 (2016-04-14)
5418 ==========================
5423 * Rust supports overloading of compound assignment statements like
5424 `+=` by implementing the [`AddAssign`], [`SubAssign`],
5425 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
5426 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
5428 * Empty structs can be defined with braces, as in `struct Foo { }`, in
5429 addition to the non-braced form, `struct Foo;`. [RFC 218].
5435 * [`str::encode_utf16`] (renamed from `utf16_units`)
5436 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
5439 * [`ptr::drop_in_place`]
5441 * [`time::SystemTime`]
5443 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
5444 * [`Instant::elapsed`]
5445 * [`SystemTime::now`]
5446 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
5447 * [`SystemTime::elapsed`]
5448 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
5449 * [`SystemTimeError`]
5450 * [`SystemTimeError::duration`]
5451 * Various impls for `SystemTimeError`
5453 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
5454 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
5455 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
5456 * [The `write!` and `writeln!` macros correctly emit errors if any of
5457 their arguments can't be formatted][1.8w].
5458 * [Various I/O functions support large files on 32-bit Linux][1.8l].
5459 * [The Unix-specific `raw` modules, which contain a number of
5460 redefined C types are deprecated][1.8r], including `os::raw::unix`,
5461 `os::raw::macos`, and `os::raw::linux`. These modules defined types
5462 such as `ino_t` and `dev_t`. The inconsistency of these definitions
5463 across platforms was making it difficult to implement `std`
5464 correctly. Those that need these definitions should use the `libc`
5466 * The Unix-specific `MetadataExt` traits, including
5467 `os::unix::fs::MetadataExt`, which expose values such as inode
5468 numbers [no longer return platform-specific types][1.8r], but
5469 instead return widened integers. [RFC 1415].
5470 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
5471 * [Atomic loads and stores are not volatile][1.8a].
5472 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
5477 * [Inlining hash functions lead to a 3% compile-time improvement in
5478 some workloads][1.8h].
5479 * When using jemalloc, its symbols are [unprefixed so that it
5480 overrides the libc malloc implementation][1.8h]. This means that for
5481 rustc, LLVM is now using jemalloc, which results in a 6%
5482 compile-time improvement on a specific workload.
5483 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
5488 * [32-bit MSVC builds finally implement unwinding][1.8ms].
5489 i686-pc-windows-msvc is now considered a tier-1 platform.
5490 * [The `--print targets` flag prints a list of supported targets][1.8t].
5491 * [The `--print cfg` flag prints the `cfg`s defined for the current
5493 * [`rustc` can be built with an new Cargo-based build system, written
5494 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
5495 build system. To enable it configure with `configure --rustbuild`.
5496 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
5497 variants while also indicating the total number of missing variants
5498 if more than 3][1.8m].
5499 * [Executable stacks are disabled on Linux and BSD][1.8nx].
5500 * The Rust Project now publishes binary releases of the standard
5501 library for a number of tier-2 targets:
5502 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
5503 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
5504 `x86_64-rumprun-netbsd`. These can be installed with
5505 tools such as [multirust][1.8mr].
5510 * [`cargo init` creates a new Cargo project in the current
5511 directory][1.8ci]. It is otherwise like `cargo new`.
5512 * [Cargo has configuration keys for `-v` and
5513 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
5514 `[term]` section of `.cargo/config`.
5515 * [Configuration keys that evaluate to strings or integers can be set
5516 via environment variables][1.8ce]. For example the `build.jobs` key
5517 can be set via `CARGO_BUILD_JOBS`. Environment variables take
5518 precedence over config files.
5519 * [Target-specific dependencies support Rust `cfg` syntax for
5520 describing targets][1.8cfg] so that dependencies for multiple
5521 targets can be specified together. [RFC 1361].
5522 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
5523 `RUSTDOC` take precedence over the `build.target-dir`,
5524 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
5525 * [The child process tree is killed on Windows when Cargo is
5527 * [The `build.target` configuration value sets the target platform,
5528 like `--target`][1.8ct].
5533 * [Unstable compiler flags have been further restricted][1.8u]. Since
5534 1.0 `-Z` flags have been considered unstable, and other flags that
5535 were considered unstable additionally required passing `-Z
5536 unstable-options` to access. Unlike unstable language and library
5537 features though, these options have been accessible on the stable
5538 release channel. Going forward, *new unstable flags will not be
5539 available on the stable release channel*, and old unstable flags
5540 will warn about their usage. In the future, all unstable flags will
5541 be unavailable on the stable release channel.
5542 * [It is no longer possible to `match` on empty enum variants using
5543 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
5544 * The Unix-specific `MetadataExt` traits, including
5545 `os::unix::fs::MetadataExt`, which expose values such as inode
5546 numbers [no longer return platform-specific types][1.8r], but
5547 instead return widened integers. [RFC 1415].
5548 * [Modules sourced from the filesystem cannot appear within arbitrary
5549 blocks, but only within other modules][1.8mf].
5550 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
5551 * On Unix, [stack overflow triggers a runtime abort instead of a
5553 * [`Command::spawn` and its equivalents return an error if any of
5554 its command-line arguments contain interior `NUL`s][1.8n].
5555 * [Tuple and unit enum variants from other crates are in the type
5557 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
5558 type instead of `.a` files][1.8st]. Additionally, for the MSVC
5559 toolchain, `rustc` emits import libraries named `foo.dll.lib`
5560 instead of `foo.lib`.
5563 [1.8a]: https://github.com/rust-lang/rust/pull/30962
5564 [1.8b]: https://github.com/rust-lang/rust/pull/31123
5565 [1.8c]: https://github.com/rust-lang/rust/pull/31530
5566 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
5567 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
5568 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
5569 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
5570 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
5571 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
5572 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
5573 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
5574 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
5575 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
5576 [1.8h]: https://github.com/rust-lang/rust/pull/31460
5577 [1.8l]: https://github.com/rust-lang/rust/pull/31668
5578 [1.8m]: https://github.com/rust-lang/rust/pull/31020
5579 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
5580 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
5581 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
5582 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
5583 [1.8n]: https://github.com/rust-lang/rust/pull/31056
5584 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
5585 [1.8r]: https://github.com/rust-lang/rust/pull/31551
5586 [1.8so]: https://github.com/rust-lang/rust/pull/31333
5587 [1.8st]: https://github.com/rust-lang/rust/pull/29520
5588 [1.8t]: https://github.com/rust-lang/rust/pull/31358
5589 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
5590 [1.8u]: https://github.com/rust-lang/rust/pull/31793
5591 [1.8v]: https://github.com/rust-lang/rust/pull/31757
5592 [1.8w]: https://github.com/rust-lang/rust/pull/31904
5593 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
5594 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
5595 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
5596 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
5597 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
5598 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
5599 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
5600 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
5601 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
5602 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
5603 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
5604 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
5605 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
5606 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
5607 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
5608 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
5609 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
5610 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
5611 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
5612 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
5613 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
5614 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
5615 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
5616 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
5617 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
5618 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
5619 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
5620 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
5621 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
5622 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
5625 Version 1.7.0 (2016-03-03)
5626 ==========================
5633 * [`Path::strip_prefix`] (renamed from relative_from)
5634 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
5636 * [`Ipv4Addr::is_loopback`]
5637 * [`Ipv4Addr::is_private`]
5638 * [`Ipv4Addr::is_link_local`]
5639 * [`Ipv4Addr::is_multicast`]
5640 * [`Ipv4Addr::is_broadcast`]
5641 * [`Ipv4Addr::is_documentation`]
5643 * [`Ipv6Addr::is_unspecified`]
5644 * [`Ipv6Addr::is_loopback`]
5645 * [`Ipv6Addr::is_multicast`]
5648 * [`Vec::as_mut_slice`]
5650 * [`String::as_str`]
5651 * [`String::as_mut_str`]
5653 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
5655 * `<[T]>::`[`sort_by_key`]
5656 * checked, saturated, and overflowing operations
5657 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
5658 * [`i32::saturating_mul`]
5659 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
5660 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
5661 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
5662 * [`u32::saturating_mul`]
5663 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
5664 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
5665 * and checked, saturated, and overflowing operations for other primitive types
5667 * [`ffi::IntoStringError`]
5668 * [`CString::into_string`]
5669 * [`CString::into_bytes`]
5670 * [`CString::into_bytes_with_nul`]
5671 * `From<CString> for Vec<u8>`
5673 * [`IntoStringError::into_cstring`]
5674 * [`IntoStringError::utf8_error`]
5675 * `Error for IntoStringError`
5677 * [`std::hash::BuildHasher`]
5678 * [`BuildHasher::Hasher`]
5679 * [`BuildHasher::build_hasher`]
5680 * [`std::hash::BuildHasherDefault`]
5681 * [`HashMap::with_hasher`]
5682 * [`HashMap::with_capacity_and_hasher`]
5683 * [`HashSet::with_hasher`]
5684 * [`HashSet::with_capacity_and_hasher`]
5685 * [`std::collections::hash_map::RandomState`]
5686 * [`RandomState::new`]
5687 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
5688 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
5689 from bytes is faster.
5690 * [The performance of `LineWriter` (and thus `io::stdout`) was
5691 improved by using `memchr` to search for newlines][1.7m].
5692 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
5693 `f64` variants were stabilized previously.
5694 * [`BTreeMap` was rewritten to use less memory and improve the performance
5695 of insertion and iteration, the latter by as much as 5x][1.7bm].
5696 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
5697 covariant over their contained type][1.7bt].
5698 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
5699 over their contained type][1.7ll].
5700 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
5702 * [`Any` is implemented for unsized types][1.7a].
5703 * [`Hash` is implemented for `Duration`][1.7h].
5708 * [When running tests with `--test`, rustdoc will pass `--cfg`
5709 arguments to the compiler][1.7dt].
5710 * [The compiler is built with RPATH information by default][1.7rpa].
5711 This means that it will be possible to run `rustc` when installed in
5712 unusual configurations without configuring the dynamic linker search
5714 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
5715 any RPATH entries (emitted with `-C rpath`) *not* take precedence
5716 over `LD_LIBRARY_PATH`.
5721 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
5722 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
5723 * [The `rerun-if-changed` build script directive no longer causes the
5724 build script to incorrectly run twice in certain scenarios][1.7rr].
5729 * Soundness fixes to the interactions between associated types and
5730 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
5731 code that violates the new rules. This is a significant change that
5732 is known to break existing code, so it has emitted warnings for the
5733 new error cases since 1.4 to give crate authors time to adapt. The
5734 details of what is changing are subtle; read the RFC for more.
5735 * [Several bugs in the compiler's visibility calculations were
5736 fixed][1.7v]. Since this was found to break significant amounts of
5737 code, the new errors will be emitted as warnings for several release
5738 cycles, under the `private_in_public` lint.
5739 * Defaulted type parameters were accidentally accepted in positions
5740 that were not intended. In this release, [defaulted type parameters
5741 appearing outside of type definitions will generate a
5742 warning][1.7d], which will become an error in future releases.
5743 * [Parsing "." as a float results in an error instead of 0][1.7p].
5744 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
5745 * [Borrows of closure parameters may not outlive the closure][1.7bc].
5747 [1.7a]: https://github.com/rust-lang/rust/pull/30928
5748 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
5749 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
5750 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
5751 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
5752 [1.7d]: https://github.com/rust-lang/rust/pull/30724
5753 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
5754 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
5755 [1.7f]: https://github.com/rust-lang/rust/pull/30672
5756 [1.7h]: https://github.com/rust-lang/rust/pull/30818
5757 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
5758 [1.7m]: https://github.com/rust-lang/rust/pull/30381
5759 [1.7p]: https://github.com/rust-lang/rust/pull/30681
5760 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
5761 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
5762 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
5763 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
5764 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
5765 [1.7v]: https://github.com/rust-lang/rust/pull/29973
5766 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
5767 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
5768 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
5769 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
5770 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
5771 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
5772 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
5773 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
5774 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
5775 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
5776 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
5777 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
5778 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
5779 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
5780 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
5781 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
5782 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
5783 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
5784 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
5785 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
5786 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
5787 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
5788 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
5789 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
5790 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
5791 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
5792 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
5793 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
5794 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
5795 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
5796 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
5797 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
5798 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
5799 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
5800 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
5801 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
5802 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
5803 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
5804 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
5805 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
5806 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
5807 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
5808 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
5809 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
5810 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
5811 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
5812 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
5813 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5814 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
5815 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
5816 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
5817 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
5818 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
5819 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
5820 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
5821 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
5822 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
5823 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
5824 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
5825 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
5828 Version 1.6.0 (2016-01-21)
5829 ==========================
5834 * The `#![no_std]` attribute causes a crate to not be linked to the
5835 standard library, but only the [core library][1.6co], as described
5836 in [RFC 1184]. The core library defines common types and traits but
5837 has no platform dependencies whatsoever, and is the basis for Rust
5838 software in environments that cannot support a full port of the
5839 standard library, such as operating systems. Most of the core
5840 library is now stable.
5846 [`Read::read_exact`],
5847 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
5848 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
5849 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
5850 [`os::unix::fs::DirBuilderExt`],
5851 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
5852 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
5853 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
5854 [`collections::hash_map::Drain`],
5855 [`collections::hash_map::HashMap::drain`],
5856 [`collections::hash_set::Drain`],
5857 [`collections::hash_set::HashSet::drain`],
5858 [`collections::binary_heap::Drain`],
5859 [`collections::binary_heap::BinaryHeap::drain`],
5860 [`Vec::extend_from_slice`] (renamed from `push_all`),
5861 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
5862 [`RwLock::into_inner`],
5863 [`Iterator::min_by_key`] (renamed from `min_by`),
5864 [`Iterator::max_by_key`] (renamed from `max_by`).
5865 * The [core library][1.6co] is stable, as are most of its APIs.
5866 * [The `assert_eq!` macro supports arguments that don't implement
5867 `Sized`][1.6ae], such as arrays. In this way it behaves more like
5869 * Several timer functions that take duration in milliseconds [are
5870 deprecated in favor of those that take `Duration`][1.6ms]. These
5871 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
5872 `thread::park_timeout_ms`.
5873 * The algorithm by which `Vec` reserves additional elements was
5874 [tweaked to not allocate excessive space][1.6a] while still growing
5876 * `From` conversions are [implemented from integers to floats][1.6f]
5877 in cases where the conversion is lossless. Thus they are not
5878 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
5879 or `f64`. They are also not implemented for `isize` and `usize`
5880 because the implementations would be platform-specific. `From` is
5881 also implemented from `f32` to `f64`.
5882 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
5883 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
5884 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
5885 * [`BinaryHeap` was refactored][1.6bh] for modest performance
5887 * Sorting slices that are already sorted [is 50% faster in some
5893 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
5894 * Cargo build scripts can specify their dependencies by emitting the
5895 [`rerun-if-changed`][1.6rr] key.
5896 * crates.io will reject publication of crates with dependencies that
5897 have a wildcard version constraint. Crates with wildcard
5898 dependencies were seen to cause a variety of problems, as described
5899 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
5901 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
5902 release folder. A variety of artifacts that Cargo failed to clean
5903 are now correctly deleted.
5908 * The `unreachable_code` lint [warns when a function call's argument
5910 * The parser indicates [failures that may be caused by
5911 confusingly-similar Unicode characters][1.6uc]
5912 * Certain macro errors [are reported at definition time][1.6m], not
5918 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
5919 environment variable when locating crates. This was a pre-cargo
5920 feature for integrating with the package manager that was
5921 accidentally never removed.
5922 * [A number of bugs were fixed in the privacy checker][1.6p] that
5923 could cause previously-accepted code to break.
5924 * [Modules and unit/tuple structs may not share the same name][1.6ts].
5925 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
5926 struct pattern syntax (`Foo(..)`) can no longer be used to match
5927 unit structs. This is a warning now, but will become an error in
5928 future releases. Patterns that share the same name as a const are
5930 * A bug was fixed that causes [rustc not to apply default type
5931 parameters][1.6xc] when resolving certain method implementations of
5932 traits defined in other crates.
5934 [1.6a]: https://github.com/rust-lang/rust/pull/29454
5935 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
5936 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
5937 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
5938 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
5939 [1.6co]: http://doc.rust-lang.org/core/index.html
5940 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
5941 [1.6f]: https://github.com/rust-lang/rust/pull/29129
5942 [1.6m]: https://github.com/rust-lang/rust/pull/29828
5943 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
5944 [1.6p]: https://github.com/rust-lang/rust/pull/29726
5945 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
5946 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
5947 [1.6s]: https://github.com/rust-lang/rust/pull/29675
5948 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
5949 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
5950 [1.6us]: https://github.com/rust-lang/rust/pull/29383
5951 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
5952 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
5953 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
5954 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
5955 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
5956 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
5957 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
5958 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
5959 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
5960 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
5961 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
5962 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
5963 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
5964 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
5965 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
5966 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
5967 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
5968 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
5969 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
5970 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
5971 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
5972 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
5973 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
5974 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
5975 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
5976 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
5977 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
5978 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
5979 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
5980 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
5983 Version 1.5.0 (2015-12-10)
5984 ==========================
5986 * ~700 changes, numerous bugfixes
5992 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
5993 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
5994 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
5995 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
5996 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
5997 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
5998 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
5999 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6000 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6001 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6002 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6003 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6004 [`Path::read_link`], [`Path::symlink_metadata`],
6005 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6006 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6007 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6008 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6009 [`slice::split_first_mut`], [`slice::split_first`],
6010 [`slice::split_last_mut`], [`slice::split_last`],
6011 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6012 [`str::MatchIndices`], [`str::RMatchIndices`],
6013 [`str::match_indices`], [`str::rmatch_indices`],
6014 [`str::slice_mut_unchecked`], [`string::ParseError`].
6015 * Rust applications hosted on crates.io can be installed locally to
6016 `~/.cargo/bin` with the [`cargo install`] command. Among other
6017 things this makes it easier to augment Cargo with new subcommands:
6018 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6019 invoked as `cargo foo`.
6020 * Crates with wildcard (`*`) dependencies will [emit warnings when
6021 published][1.5w]. In 1.6 it will no longer be possible to publish
6022 crates with wildcard dependencies.
6027 * The rules determining when a particular lifetime must outlive
6028 a particular value (known as '[dropck]') have been [modified
6029 to not rely on parametricity][1.5p].
6030 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6031 and `Arc`][1.5a]. Because these smart pointer types implement
6032 `Deref`, this causes breakage in cases where the interior type
6033 contains methods of the same name.
6034 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6035 that they could drop their content. Soundness fix.
6036 * All method invocations are [properly checked][1.5wf1] for
6037 [well-formedness][1.5wf2]. Soundness fix.
6038 * Traits whose supertraits contain `Self` are [not object
6039 safe][1.5o]. Soundness fix.
6040 * Target specifications support a [`no_default_libraries`][1.5nd]
6041 setting that controls whether `-nodefaultlibs` is passed to the
6042 linker, and in turn the `is_like_windows` setting no longer affects
6043 the `-nodefaultlibs` flag.
6044 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6045 * The `#[inline]` and `#[repr]` attributes [can only appear
6046 in valid locations][1.5at].
6047 * Native libraries linked from the local crate are [passed to
6048 the linker before native libraries from upstream crates][1.5nl].
6049 * Two rarely-used attributes, `#[no_debug]` and
6050 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6051 * Negation of unsigned integers, which has been a warning for
6052 several releases, [is now behind a feature gate and will
6053 generate errors][1.5nu].
6054 * The parser accidentally accepted visibility modifiers on
6055 enum variants, a bug [which has been fixed][1.5ev].
6056 * [A bug was fixed that allowed `use` statements to import unstable
6062 * When evaluating expressions at compile-time that are not
6063 compile-time constants (const-evaluating expressions in non-const
6064 contexts), incorrect code such as overlong bitshifts and arithmetic
6065 overflow will [generate a warning instead of an error][1.5ce],
6066 delaying the error until runtime. This will allow the
6067 const-evaluator to be expanded in the future backwards-compatibly.
6068 * The `improper_ctypes` lint [no longer warns about using `isize` and
6069 `usize` in FFI][1.5ict].
6074 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6076 * `Default` is [implemented for mutable slices][1.5d].
6077 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6078 * There are now `From` conversions [between floating point
6079 types][1.5f] where the conversions are lossless.
6080 * There are now `From` conversions [between integer types][1.5i] where
6081 the conversions are lossless.
6082 * [`fs::Metadata` implements `Clone`][1.5fs].
6083 * The `parse` method [accepts a leading "+" when parsing
6085 * [`AsMut` is implemented for `Vec`][1.5am].
6086 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6087 been optimized][1.5cf] and no longer rely on the default impl.
6088 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6089 `unsafe extern "C"` function types now [implement `Clone`,
6090 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6091 `fmt::Debug` for up to 12 arguments][1.5fp].
6092 * [Dropping `Vec`s is much faster in unoptimized builds when the
6093 element types don't implement `Drop`][1.5dv].
6094 * A bug that caused in incorrect behavior when [combining `VecDeque`
6095 with zero-sized types][1.5vdz] was resolved.
6096 * [`PartialOrd` for slices is faster][1.5po].
6101 * [Crate metadata size was reduced by 20%][1.5md].
6102 * [Improvements to code generation reduced the size of libcore by 3.3
6103 MB and rustc's memory usage by 18MB][1.5m].
6104 * [Improvements to deref translation increased performance in
6105 unoptimized builds][1.5dr].
6106 * Various errors in trait resolution [are deduplicated to only be
6107 reported once][1.5te].
6108 * Rust has preliminary [support for rumprun kernels][1.5rr].
6109 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6111 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6112 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6113 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6114 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6115 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6116 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6117 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6118 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6119 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6120 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6121 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6122 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6123 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6124 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6125 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6126 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6127 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6128 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6129 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6130 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6131 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6132 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6133 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6134 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6135 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6136 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6137 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6138 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6139 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6140 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6141 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6142 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6143 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6144 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6145 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6146 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6147 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6148 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6149 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6150 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6151 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6152 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6153 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6154 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6155 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6156 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6157 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6158 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6159 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6160 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6161 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6162 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6163 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6164 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6165 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6166 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6167 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6168 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6169 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6170 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6171 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6172 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6173 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6174 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6175 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6176 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6177 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6178 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6179 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6180 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6181 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6182 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6183 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6184 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6185 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6186 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6187 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6188 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6189 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6190 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6191 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6192 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6193 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6194 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6195 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6196 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6197 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6198 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6199 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6201 Version 1.4.0 (2015-10-29)
6202 ==========================
6204 * ~1200 changes, numerous bugfixes
6209 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6210 GNU) are now supported and recommended for use.
6215 * [Several changes have been made to fix type soundness and improve
6216 the behavior of associated types][sound]. See [RFC 1214]. Although
6217 we have mostly introduced these changes as warnings this release, to
6218 become errors next release, there are still some scenarios that will
6219 see immediate breakage.
6220 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6221 line breaks in addition to `\n`][crlf].
6222 * [Loans of `'static` lifetime extend to the end of a function][stat].
6223 * [`str::parse` no longer introduces avoidable rounding error when
6224 parsing floating point numbers. Together with earlier changes to
6225 float formatting/output, "round trips" like f.to_string().parse()
6226 now preserve the value of f exactly. Additionally, leading plus
6227 signs are now accepted][fp3].
6233 * `use` statements that import multiple items [can now rename
6234 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6235 * [Binops work correctly on fat pointers][binfat].
6236 * `pub extern crate`, which does not behave as expected, [issues a
6237 warning][pec] until a better solution is found.
6242 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6243 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6244 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6245 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6246 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6247 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6248 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6249 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6250 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6251 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6252 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6253 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6254 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6255 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6256 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6257 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6258 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6259 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6261 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6262 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6263 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6264 `f64::from_str_radix`.
6265 * [Reverse-searching strings is faster with the 'two-way'
6267 * [`std::io::copy` allows `?Sized` arguments][cc].
6268 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6269 [override `count`, `nth` and `last` with an O(1)
6270 implementation][it].
6271 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6272 * [`IntoRawFd` has been added to the Unix-specific prelude,
6273 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6275 * [`Extend<String>` and `FromIterator<String` are both implemented for
6277 * [`IntoIterator` is implemented for references to `Option` and
6279 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6280 Copy`][ext] as part of [RFC 839]. This will cause type inference
6281 breakage in rare situations.
6282 * [`BinaryHeap` implements `Debug`][bh2].
6283 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6285 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6286 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6287 * [String comparison is faster][faststr].
6288 * `&mut T` where `T: std::fmt::Write` [also implements
6289 `std::fmt::Write`][mutw].
6290 * [A stable regression in `VecDeque::push_back` and other
6291 capacity-altering methods that caused panics for zero-sized types
6293 * [Function pointers implement traits for up to 12 parameters][fp2].
6298 * The compiler [no longer uses the 'morestack' feature to prevent
6299 stack overflow][mm]. Instead it uses guard pages and stack
6300 probes (though stack probes are not yet implemented on any platform
6302 * [The compiler matches traits faster when projections are involved][p].
6303 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6305 * [Cargo now displays useful information about what its doing during
6306 `cargo update`][cu].
6308 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6309 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6310 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6311 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6312 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6313 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6314 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6315 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6316 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6317 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6318 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6319 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6320 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6321 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6322 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6323 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6324 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6325 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6326 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6327 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6328 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6329 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6330 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6331 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6332 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6333 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6334 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6335 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6336 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6337 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6338 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6339 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6340 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6341 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6342 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6343 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6344 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6345 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6346 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6347 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6348 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6349 [bh2]: https://github.com/rust-lang/rust/pull/28156
6350 [binfat]: https://github.com/rust-lang/rust/pull/28270
6351 [bm]: https://github.com/rust-lang/rust/pull/28197
6352 [cc]: https://github.com/rust-lang/rust/pull/27531
6353 [crlf]: https://github.com/rust-lang/rust/pull/28034
6354 [cu]: https://github.com/rust-lang/cargo/pull/1931
6355 [d]: https://github.com/rust-lang/rust/pull/27825
6356 [dep]: https://github.com/rust-lang/rust/pull/28339
6357 [es]: https://github.com/rust-lang/rust/pull/27956
6358 [ext]: https://github.com/rust-lang/rust/pull/28094
6359 [faststr]: https://github.com/rust-lang/rust/pull/28338
6360 [ffi]: https://github.com/rust-lang/rust/pull/28779
6361 [fp]: https://github.com/rust-lang/rust/pull/28268
6362 [fp2]: https://github.com/rust-lang/rust/pull/28560
6363 [fp3]: https://github.com/rust-lang/rust/pull/27307
6364 [i]: https://github.com/rust-lang/rust/pull/27451
6365 [into2]: https://github.com/rust-lang/rust/pull/28039
6366 [it]: https://github.com/rust-lang/rust/pull/27652
6367 [mm]: https://github.com/rust-lang/rust/pull/27338
6368 [mutw]: https://github.com/rust-lang/rust/pull/28368
6369 [sound]: https://github.com/rust-lang/rust/pull/27641
6370 [p]: https://github.com/rust-lang/rust/pull/27866
6371 [pec]: https://github.com/rust-lang/rust/pull/28486
6372 [pr]: https://github.com/rust-lang/rust/pull/27896
6373 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6374 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6375 [s]: https://github.com/rust-lang/rust/pull/27474
6376 [stab]: https://github.com/rust-lang/rust/pull/28339
6377 [stat]: https://github.com/rust-lang/rust/pull/28321
6378 [vd]: https://github.com/rust-lang/rust/pull/28494
6380 Version 1.3.0 (2015-09-17)
6381 ==============================
6383 * ~900 changes, numerous bugfixes
6388 * The [new object lifetime defaults][nold] have been [turned
6389 on][nold2] after a cycle of warnings about the change. Now types
6390 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
6391 being interpreted as `&'a Box<Trait+'a>` to `&'a
6392 Box<Trait+'static>`.
6393 * [The Rustonomicon][nom] is a new book in the official documentation
6394 that dives into writing unsafe Rust.
6395 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
6396 timekeeping is employed by other std APIs, as well as out-of-tree
6402 * The [new object lifetime defaults][nold] have been [turned
6403 on][nold2] after a cycle of warnings about the change.
6404 * There is a known [regression][lr] in how object lifetime elision is
6405 interpreted, the proper solution for which is undetermined.
6406 * The `#[prelude_import]` attribute, an internal implementation
6407 detail, was accidentally stabilized previously. [It has been put
6408 behind the `prelude_import` feature gate][pi]. This change is
6409 believed to break no existing code.
6410 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6411 [more sane for dynamically sized types][dst3]. Code that relied on
6412 the previous behavior is thought to be broken.
6413 * The `dropck` rules, which checks that destructors can't access
6414 destroyed values, [have been updated][dropck] to match the
6415 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
6416 cause some previously-compiling code to no longer build.
6421 * The [new object lifetime defaults][nold] have been [turned
6422 on][nold2] after a cycle of warnings about the change.
6423 * Semicolons may [now follow types and paths in
6424 macros](https://github.com/rust-lang/rust/pull/27000).
6425 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
6426 [more sane for dynamically sized types][dst3]. Code that relied on
6427 the previous behavior is not known to exist, and suspected to be
6429 * `'static` variables [may now be recursive][st].
6430 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
6431 implementations correctly.
6432 * The `dropck` rules, which checks that destructors can't access
6433 destroyed values, [have been updated][dropck] to match the
6439 * The [`Duration`] API, [has been stabilized][ds], as well as the
6440 `std::time` module, which presently contains only `Duration`.
6441 * `Box<str>` and `Box<[T]>` both implement `Clone`.
6442 * The owned C string, [`CString`], implements [`Borrow`] and the
6443 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
6444 these allow C strings to be borrowed and cloned in generic code.
6445 * [`CStr`] implements [`Debug`].
6446 * [`AtomicPtr`] implements [`Debug`].
6447 * [`Error`] trait objects [can be downcast to their concrete types][e]
6448 in many common configurations, using the [`is`], [`downcast`],
6449 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
6451 * Searching for substrings now [employs the two-way algorithm][search]
6452 instead of doing a naive search. This gives major speedups to a
6453 number of methods, including [`contains`][sc], [`find`][sf],
6454 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
6455 [`ends_with`][sew] are also faster.
6456 * The performance of `PartialEq` for slices is [much faster][ps].
6457 * The [`Hash`] trait offers the default method, [`hash_slice`], which
6458 is overridden and optimized by the implementations for scalars.
6459 * The [`Hasher`] trait now has a number of specialized `write_*`
6460 methods for primitive types, for efficiency.
6461 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
6462 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
6463 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
6464 of [`std::error::Error::cause`][iec] also delegates to the inner
6466 * [`process::Child`][pc] gained the [`id`] method, which returns a
6467 `u32` representing the platform-specific process identifier.
6468 * The [`connect`] method on slices is deprecated, replaced by the new
6469 [`join`] method (note that both of these are on the *unstable*
6470 [`SliceConcatExt`] trait, but through the magic of the prelude are
6471 available to stable code anyway).
6472 * The [`Div`] operator is implemented for [`Wrapping`] types.
6473 * [`DerefMut` is implemented for `String`][dms].
6474 * Performance of SipHash (the default hasher for `HashMap`) is
6475 [better for long data][sh].
6476 * [`AtomicPtr`] implements [`Send`].
6477 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
6478 are now [specialized to use uninitialized buffers for increased
6480 * Lifetime parameters of foreign functions [are now resolved
6486 * Rust can now, with some coercion, [produce programs that run on
6487 Windows XP][xp], though XP is not considered a supported platform.
6488 * Porting Rust on Windows from the GNU toolchain to MSVC continues
6489 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
6490 recommended for use in 1.3, though should be fully-functional
6491 in the [64-bit 1.4 beta][b14].
6492 * On Fedora-based systems installation will [properly configure the
6493 dynamic linker][fl].
6494 * The compiler gained many new extended error descriptions, which can
6495 be accessed with the `--explain` flag.
6496 * The `dropck` pass, which checks that destructors can't access
6497 destroyed values, [has been rewritten][dropck]. This fixes some
6498 soundness holes, and as such will cause some previously-compiling
6499 code to no longer build.
6500 * `rustc` now uses [LLVM to write archive files where possible][ar].
6501 Eventually this will eliminate the compiler's dependency on the ar
6503 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
6504 supported FreeBSD on x86_64).
6505 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
6506 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
6508 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
6509 will kill the process instead of leaking][nlp].
6511 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
6512 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
6513 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
6514 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
6515 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
6516 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6517 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6518 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
6519 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
6520 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
6521 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
6522 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
6523 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
6524 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6525 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
6526 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
6527 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
6528 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
6529 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6530 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
6531 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
6532 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
6533 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
6534 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6535 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
6536 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
6537 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
6538 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
6539 [ar]: https://github.com/rust-lang/rust/pull/26926
6540 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
6541 [dms]: https://github.com/rust-lang/rust/pull/26241
6542 [dropck]: https://github.com/rust-lang/rust/pull/27261
6543 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
6544 [ds]: https://github.com/rust-lang/rust/pull/26818
6545 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
6546 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
6547 [dst3]: https://github.com/rust-lang/rust/pull/27351
6548 [e]: https://github.com/rust-lang/rust/pull/24793
6549 [f]: https://github.com/rust-lang/rust/pull/26588
6550 [fb]: https://github.com/rust-lang/rust/pull/26959
6551 [fl]: https://github.com/rust-lang/rust-installer/pull/41
6552 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
6553 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
6554 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
6555 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
6556 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
6557 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
6558 [lic]: https://github.com/rust-lang/rust/pull/26583
6559 [lnu]: https://github.com/rust-lang/rust/pull/27026
6560 [lr]: https://github.com/rust-lang/rust/issues/27248
6561 [lum]: https://github.com/rust-lang/rust/pull/26378
6562 [lur]: https://github.com/rust-lang/rust/pull/26783
6563 [nlp]: https://github.com/rust-lang/rust/pull/27176
6564 [nold2]: https://github.com/rust-lang/rust/pull/27045
6565 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
6566 [nom]: http://doc.rust-lang.org/nightly/nomicon/
6567 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
6568 [pi]: https://github.com/rust-lang/rust/pull/26699
6569 [ps]: https://github.com/rust-lang/rust/pull/26884
6570 [rte]: https://github.com/rust-lang/rust/pull/26950
6571 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
6572 [search]: https://github.com/rust-lang/rust/pull/26327
6573 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
6574 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
6575 [sh]: https://github.com/rust-lang/rust/pull/27280
6576 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
6577 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
6578 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
6579 [st]: https://github.com/rust-lang/rust/pull/26630
6580 [win1]: https://github.com/rust-lang/rust/pull/26569
6581 [win2]: https://github.com/rust-lang/rust/pull/26741
6582 [win3]: https://github.com/rust-lang/rust/pull/26741
6583 [win4]: https://github.com/rust-lang/rust/pull/27210
6584 [xp]: https://github.com/rust-lang/rust/pull/26569
6586 Version 1.2.0 (2015-08-07)
6587 ==========================
6589 * ~1200 changes, numerous bugfixes
6594 * [Dynamically-sized-type coercions][dst] allow smart pointer types
6595 like `Rc` to contain types without a fixed size, arrays and trait
6596 objects, finally enabling use of `Rc<[T]>` and completing the
6597 implementation of DST.
6598 * [Parallel codegen][parcodegen] is now working again, which can
6599 substantially speed up large builds in debug mode; It also gets
6600 another ~33% speedup when bootstrapping on a 4 core machine (using 8
6601 jobs). It's not enabled by default, but will be "in the near
6602 future". It can be activated with the `-C codegen-units=N` flag to
6604 * This is the first release with [experimental support for linking
6605 with the MSVC linker and lib C on Windows (instead of using the GNU
6606 variants via MinGW)][win]. It is yet recommended only for the most
6607 intrepid Rustaceans.
6608 * Benchmark compilations are showing a 30% improvement in
6609 bootstrapping over 1.1.
6614 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
6615 unicode case mapping, which is a previously-planned change in
6616 behavior and considered a bugfix.
6617 * [`mem::align_of`] now specifies [the *minimum alignment* for
6618 T][align], which is usually the alignment programs are interested
6619 in, and the same value reported by clang's
6620 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
6622 * [The `#[packed]` attribute is no longer silently accepted by the
6623 compiler][packed]. This attribute did nothing and code that
6624 mentioned it likely did not work as intended.
6625 * Associated type defaults are [now behind the
6626 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
6627 defaults *did not work*, but could be mentioned syntactically. As
6628 such this breakage has minimal impact.
6633 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
6634 matching against dereferenceable values.
6639 * The [`Extend`] trait, which grows a collection from an iterator, is
6640 implemented over iterators of references, for `String`, `Vec`,
6641 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
6642 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
6643 * The [`iter::once`] function returns an iterator that yields a single
6644 element, and [`iter::empty`] returns an iterator that yields no
6646 * The [`matches`] and [`rmatches`] methods on `str` return iterators
6647 over substring matches.
6648 * [`Cell`] and [`RefCell`] both implement `Eq`.
6649 * A number of methods for wrapping arithmetic are added to the
6650 integral types, [`wrapping_div`], [`wrapping_rem`],
6651 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
6652 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
6653 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
6654 type.. It is illegal for the default arithmetic operations in Rust
6655 to overflow; the desire to wrap must be explicit.
6656 * The `{:#?}` formatting specifier [displays the alternate,
6657 pretty-printed][debugfmt] form of the `Debug` formatter. This
6658 feature was actually introduced prior to 1.0 with little
6660 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
6661 for writing data to formatted strings, similar to [`io::Write`].
6662 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
6663 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
6664 are used by code generators to emit implementations of [`Debug`].
6665 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
6666 methods that convert case, following Unicode case mapping.
6667 * It is now easier to handle poisoned locks. The [`PoisonError`]
6668 type, returned by failing lock operations, exposes `into_inner`,
6669 `get_ref`, and `get_mut`, which all give access to the inner lock
6670 guard, and allow the poisoned lock to continue to operate. The
6671 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
6672 poisoned lock without attempting to take the lock.
6673 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
6674 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
6675 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
6676 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
6678 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
6684 * `rustc` employs smarter heuristics for guessing at [typos].
6685 * `rustc` emits more efficient code for [no-op conversions between
6686 unsafe pointers][nop].
6687 * Fat pointers are now [passed in pairs of immediate arguments][fat],
6688 resulting in faster compile times and smaller code.
6690 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
6691 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
6692 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
6693 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
6694 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
6695 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
6696 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
6697 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
6698 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
6699 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
6700 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
6701 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
6702 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
6703 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
6704 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
6705 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
6706 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
6707 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
6708 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
6709 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
6710 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
6711 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
6712 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
6713 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
6714 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
6715 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
6716 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
6717 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
6718 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
6719 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
6720 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
6721 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
6722 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
6723 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6724 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6725 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
6726 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
6727 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
6728 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
6729 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
6730 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
6731 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
6732 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
6733 [align]: https://github.com/rust-lang/rust/pull/25646
6734 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
6735 [typos]: https://github.com/rust-lang/rust/pull/26087
6736 [nop]: https://github.com/rust-lang/rust/pull/26336
6737 [fat]: https://github.com/rust-lang/rust/pull/26411
6738 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
6739 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
6740 [packed]: https://github.com/rust-lang/rust/pull/25541
6741 [ad]: https://github.com/rust-lang/rust/pull/27382
6742 [win]: https://github.com/rust-lang/rust/pull/25350
6744 Version 1.1.0 (2015-06-25)
6745 =========================
6747 * ~850 changes, numerous bugfixes
6752 * The [`std::fs` module has been expanded][fs] to expand the set of
6753 functionality exposed:
6754 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
6755 don't incur a syscall on some platforms.
6756 * A `symlink_metadata` function has been added.
6757 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
6758 access to all underlying information.
6759 * The compiler now contains extended explanations of many errors. When an error
6760 with an explanation occurs the compiler suggests using the `--explain` flag
6761 to read the explanation. Error explanations are also [available online][err-index].
6762 * Thanks to multiple [improvements][sk] to [type checking][pre], as
6763 well as other work, the time to bootstrap the compiler decreased by
6769 * The [`str::split_whitespace`] method splits a string on unicode
6770 whitespace boundaries.
6771 * On both Windows and Unix, new extension traits provide conversion of
6772 I/O types to and from the underlying system handles. On Unix, these
6773 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
6774 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
6775 `TcpListener`, and `UpdSocket`. Further implementations for
6776 `std::process` will be stabilized later.
6777 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
6778 Windows, symlinks can be created with
6779 `std::os::windows::symlink_dir` and
6780 `std::os::windows::symlink_file`.
6781 * The `mpsc::Receiver` type can now be converted into an iterator with
6782 `into_iter` on the [`IntoIterator`] trait.
6783 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
6784 implementation of the [`From`] trait.
6785 * The `Debug` implementation for `RangeFull` [creates output that is
6786 more consistent with other implementations][rf].
6787 * [`Debug` is implemented for `File`][file].
6788 * The `Default` implementation for `Arc` [no longer requires `Sync +
6790 * [The `Iterator` methods `count`, `nth`, and `last` have been
6791 overridden for slices to have O(1) performance instead of O(n)][si].
6792 * Incorrect handling of paths on Windows has been improved in both the
6793 compiler and the standard library.
6794 * [`AtomicPtr` gained a `Default` implementation][ap].
6795 * In accordance with Rust's policy on arithmetic overflow `abs` now
6796 [panics on overflow when debug assertions are enabled][abs].
6797 * The [`Cloned`] iterator, which was accidentally left unstable for
6798 1.0 [has been stabilized][c].
6799 * The [`Incoming`] iterator, which iterates over incoming TCP
6800 connections, and which was accidentally unnamable in 1.0, [is now
6801 properly exported][inc].
6802 * [`BinaryHeap`] no longer corrupts itself [when functions called by
6803 `sift_up` or `sift_down` panic][bh].
6804 * The [`split_off`] method of `LinkedList` [no longer corrupts
6805 the list in certain scenarios][ll].
6810 * Type checking performance [has improved notably][sk] with
6811 [multiple improvements][pre].
6812 * The compiler [suggests code changes][ch] for more errors.
6813 * rustc and it's build system have experimental support for [building
6814 toolchains against MUSL][m] instead of glibc on Linux.
6815 * The compiler defines the `target_env` cfg value, which is used for
6816 distinguishing toolchains that are otherwise for the same
6817 platform. Presently this is set to `gnu` for common GNU Linux
6818 targets and for MinGW targets, and `musl` for MUSL Linux targets.
6819 * The [`cargo rustc`][crc] command invokes a build with custom flags
6821 * [Android executables are always position independent][pie].
6822 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
6825 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
6826 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
6827 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
6828 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
6829 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
6830 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
6831 [rf]: https://github.com/rust-lang/rust/pull/24491
6832 [err-index]: https://doc.rust-lang.org/error-index.html
6833 [sk]: https://github.com/rust-lang/rust/pull/24615
6834 [pre]: https://github.com/rust-lang/rust/pull/25323
6835 [file]: https://github.com/rust-lang/rust/pull/24598
6836 [ch]: https://github.com/rust-lang/rust/pull/24683
6837 [arc]: https://github.com/rust-lang/rust/pull/24695
6838 [si]: https://github.com/rust-lang/rust/pull/24701
6839 [ap]: https://github.com/rust-lang/rust/pull/24834
6840 [m]: https://github.com/rust-lang/rust/pull/24777
6841 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
6842 [crc]: https://github.com/rust-lang/cargo/pull/1568
6843 [pie]: https://github.com/rust-lang/rust/pull/24953
6844 [abs]: https://github.com/rust-lang/rust/pull/25441
6845 [c]: https://github.com/rust-lang/rust/pull/25496
6846 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
6847 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
6848 [inc]: https://github.com/rust-lang/rust/pull/25522
6849 [bh]: https://github.com/rust-lang/rust/pull/25856
6850 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
6851 [ll]: https://github.com/rust-lang/rust/pull/26022
6852 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
6853 [drop]: https://github.com/rust-lang/rust/pull/24935
6855 Version 1.0.0 (2015-05-15)
6856 ========================
6858 * ~1500 changes, numerous bugfixes
6863 * The vast majority of the standard library is now `#[stable]`. It is
6864 no longer possible to use unstable features with a stable build of
6866 * Many popular crates on [crates.io] now work on the stable release
6868 * Arithmetic on basic integer types now [checks for overflow in debug
6874 * Several [restrictions have been added to trait coherence][coh] in
6875 order to make it easier for upstream authors to change traits
6876 without breaking downstream code.
6877 * Digits of binary and octal literals are [lexed more eagerly][lex] to
6878 improve error messages and macro behavior. For example, `0b1234` is
6879 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
6880 * Trait bounds [are always invariant][inv], eliminating the need for
6881 the `PhantomFn` and `MarkerTrait` lang items, which have been
6883 * ["-" is no longer a valid character in crate names][cr], the `extern crate
6884 "foo" as bar` syntax has been replaced with `extern crate foo as
6885 bar`, and Cargo now automatically translates "-" in *package* names
6886 to underscore for the crate name.
6887 * [Lifetime shadowing is an error][lt].
6888 * [`Send` no longer implies `'static`][send-rfc].
6889 * [UFCS now supports trait-less associated paths][moar-ufcs] like
6890 `MyType::default()`.
6891 * Primitive types [now have inherent methods][prim-inherent],
6892 obviating the need for extension traits like `SliceExt`.
6893 * Methods with `Self: Sized` in their `where` clause are [considered
6894 object-safe][self-sized], allowing many extension traits like
6895 `IteratorExt` to be merged into the traits they extended.
6896 * You can now [refer to associated types][assoc-where] whose
6897 corresponding trait bounds appear only in a `where` clause.
6898 * The final bits of [OIBIT landed][oibit-final], meaning that traits
6899 like `Send` and `Sync` are now library-defined.
6900 * A [Reflect trait][reflect] was introduced, which means that
6901 downcasting via the `Any` trait is effectively limited to concrete
6902 types. This helps retain the potentially-important "parametricity"
6903 property: generic code cannot behave differently for different type
6904 arguments except in minor ways.
6905 * The `unsafe_destructor` feature is now deprecated in favor of the
6906 [new `dropck`][dropck]. This change is a major reduction in unsafe
6912 * The `thread_local` module [has been renamed to `std::thread`][th].
6913 * The methods of `IteratorExt` [have been moved to the `Iterator`
6915 * Several traits that implement Rust's conventions for type
6916 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
6917 [centralized in the `std::convert` module][con].
6918 * The `FromError` trait [was removed in favor of `From`][fe].
6919 * The basic sleep function [has moved to
6920 `std::thread::sleep_ms`][slp].
6921 * The `splitn` function now takes an `n` parameter that represents the
6922 number of items yielded by the returned iterator [instead of the
6923 number of 'splits'][spl].
6924 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
6925 * [Derived implementations of `PartialOrd` now order enums according
6926 to their explicitly-assigned discriminants][po].
6927 * [Methods for searching strings are generic over `Pattern`s][pat],
6928 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
6930 * [In method resolution, object methods are resolved before inherent
6932 * [`String::from_str` has been deprecated in favor of the `From` impl,
6933 `String::from`][sf].
6934 * [`io::Error` implements `Sync`][ios].
6935 * [The `words` method on `&str` has been replaced with
6936 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
6938 * The new path and IO modules are complete and `#[stable]`. This
6939 was the major library focus for this cycle.
6940 * The path API was [revised][path-normalize] to normalize `.`,
6941 adjusting the tradeoffs in favor of the most common usage.
6942 * A large number of remaining APIs in `std` were also stabilized
6943 during this cycle; about 75% of the non-deprecated API surface
6945 * The new [string pattern API][string-pattern] landed, which makes
6946 the string slice API much more internally consistent and flexible.
6947 * A new set of [generic conversion traits][conversion] replaced
6948 many existing ad hoc traits.
6949 * Generic numeric traits were [completely removed][num-traits]. This
6950 was made possible thanks to inherent methods for primitive types,
6951 and the removal gives maximal flexibility for designing a numeric
6952 hierarchy in the future.
6953 * The `Fn` traits are now related via [inheritance][fn-inherit]
6954 and provide ergonomic [blanket implementations][fn-blanket].
6955 * The `Index` and `IndexMut` traits were changed to
6956 [take the index by value][index-value], enabling code like
6957 `hash_map["string"]` to work.
6958 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
6959 `Copy` data is known to be `Clone` as well.
6964 * Many errors now have extended explanations that can be accessed with
6965 the `--explain` flag to `rustc`.
6966 * Many new examples have been added to the standard library
6968 * rustdoc has received a number of improvements focused on completion
6970 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
6971 * Much headway was made on ecosystem-wide CI, making it possible
6972 to [compare builds for breakage][ci-compare].
6975 [crates.io]: http://crates.io
6976 [clo]: https://github.com/rust-lang/rust/pull/24034
6977 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
6978 [con]: https://github.com/rust-lang/rust/pull/23875
6979 [cr]: https://github.com/rust-lang/rust/pull/23419
6980 [fe]: https://github.com/rust-lang/rust/pull/23879
6981 [ie]: https://github.com/rust-lang/rust/pull/23300
6982 [inv]: https://github.com/rust-lang/rust/pull/23938
6983 [ios]: https://github.com/rust-lang/rust/pull/24133
6984 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
6985 [lt]: https://github.com/rust-lang/rust/pull/24057
6986 [meth]: https://github.com/rust-lang/rust/pull/24056
6987 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
6988 [po]: https://github.com/rust-lang/rust/pull/24270
6989 [sf]: https://github.com/rust-lang/rust/pull/24517
6990 [slp]: https://github.com/rust-lang/rust/pull/23949
6991 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
6992 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
6993 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
6994 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
6995 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
6996 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
6997 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
6998 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
6999 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7000 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7001 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7002 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7003 [reflect]: https://github.com/rust-lang/rust/pull/23712
7004 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7005 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7006 [index-value]: https://github.com/rust-lang/rust/pull/23601
7007 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7008 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7009 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7010 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7011 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7012 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7015 Version 1.0.0-alpha.2 (2015-02-20)
7016 =====================================
7018 * ~1300 changes, numerous bugfixes
7022 * The various I/O modules were [overhauled][io-rfc] to reduce
7023 unnecessary abstractions and provide better interoperation with
7024 the underlying platform. The old `io` module remains temporarily
7026 * The standard library now [participates in feature gating][feat],
7027 so use of unstable libraries now requires a `#![feature(...)]`
7028 attribute. The impact of this change is [described on the
7029 forum][feat-forum]. [RFC][feat-rfc].
7033 * `for` loops [now operate on the `IntoIterator` trait][into],
7034 which eliminates the need to call `.iter()`, etc. to iterate
7035 over collections. There are some new subtleties to remember
7036 though regarding what sort of iterators various types yield, in
7037 particular that `for foo in bar { }` yields values from a move
7038 iterator, destroying the original collection. [RFC][into-rfc].
7039 * Objects now have [default lifetime bounds][obj], so you don't
7040 have to write `Box<Trait+'static>` when you don't care about
7041 storing references. [RFC][obj-rfc].
7042 * In types that implement `Drop`, [lifetimes must outlive the
7043 value][drop]. This will soon make it possible to safely
7044 implement `Drop` for types where `#[unsafe_destructor]` is now
7045 required. Read the [gorgeous RFC][drop-rfc] for details.
7046 * The fully qualified <T as Trait>::X syntax lets you set the Self
7047 type for a trait method or associated type. [RFC][ufcs-rfc].
7048 * References to types that implement `Deref<U>` now [automatically
7049 coerce to references][deref] to the dereferenced type `U`,
7050 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7051 should eliminate many unsightly uses of `&*`, as when converting
7052 from references to vectors into references to
7053 slices. [RFC][deref-rfc].
7054 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7055 `|:|`) is obsolete and closure kind is inferred from context.
7056 * [`Self` is a keyword][Self].
7060 * The `Show` and `String` formatting traits [have been
7061 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7062 their related purposes. Automatically getting a string
7063 conversion to use with `format!("{:?}", something_to_debug)` is
7064 now written `#[derive(Debug)]`.
7065 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7066 OsStr}`, provide strings in platform-specific encodings for easier
7067 interop with system APIs. [RFC][osstr-rfc].
7068 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7069 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7070 creating raw pointers.
7074 * Certain long error messages of the form 'expected foo found bar'
7075 are now [split neatly across multiple
7076 lines][multiline]. Examples in the PR.
7077 * On Unix Rust can be [uninstalled][un] by running
7078 `/usr/local/lib/rustlib/uninstall.sh`.
7079 * The `#[rustc_on_unimplemented]` attribute, requiring the
7080 'on_unimplemented' feature, lets rustc [display custom error
7081 messages when a trait is expected to be implemented for a type
7086 * Rust is tested against a [LALR grammar][lalr], which parses
7087 almost all the Rust files that rustc does.
7089 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7090 [close]: https://github.com/rust-lang/rust/pull/21843
7091 [deref]: https://github.com/rust-lang/rust/pull/21351
7092 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7093 [drop]: https://github.com/rust-lang/rust/pull/21972
7094 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7095 [feat]: https://github.com/rust-lang/rust/pull/21248
7096 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7097 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7098 [fmt]: https://github.com/rust-lang/rust/pull/21457
7099 [into]: https://github.com/rust-lang/rust/pull/20790
7100 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7101 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7102 [lalr]: https://github.com/rust-lang/rust/pull/21452
7103 [multiline]: https://github.com/rust-lang/rust/pull/19870
7104 [obj]: https://github.com/rust-lang/rust/pull/22230
7105 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7106 [onun]: https://github.com/rust-lang/rust/pull/20889
7107 [osstr]: https://github.com/rust-lang/rust/pull/21488
7108 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7109 [Self]: https://github.com/rust-lang/rust/pull/22158
7110 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7111 [un]: https://github.com/rust-lang/rust/pull/22256
7114 Version 1.0.0-alpha (2015-01-09)
7115 ==================================
7117 * ~2400 changes, numerous bugfixes
7121 * The language itself is considered feature complete for 1.0,
7122 though there will be many usability improvements and bugfixes
7123 before the final release.
7124 * Nearly 50% of the public API surface of the standard library has
7125 been declared 'stable'. Those interfaces are unlikely to change
7127 * The long-running debate over integer types has been
7128 [settled][ints]: Rust will ship with types named `isize` and
7129 `usize`, rather than `int` and `uint`, for pointer-sized
7130 integers. Guidelines will be rolled out during the alpha cycle.
7131 * Most crates that are not `std` have been moved out of the Rust
7132 distribution into the Cargo ecosystem so they can evolve
7133 separately and don't need to be stabilized as quickly, including
7134 'time', 'getopts', 'num', 'regex', and 'term'.
7135 * Documentation continues to be expanded with more API coverage, more
7136 examples, and more in-depth explanations. The guides have been
7137 consolidated into [The Rust Programming Language][trpl].
7138 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7139 * All official Rust binary installers now come with [Cargo], the
7140 Rust package manager.
7144 * Closures have been [completely redesigned][unboxed] to be
7145 implemented in terms of traits, can now be used as generic type
7146 bounds and thus monomorphized and inlined, or via an opaque
7147 pointer (boxed) as in the old system. The new system is often
7148 referred to as 'unboxed' closures.
7149 * Traits now support [associated types][assoc], allowing families
7150 of related types to be defined together and used generically in
7152 * Enum variants are [namespaced by their type names][enum].
7153 * [`where` clauses][where] provide a more versatile and attractive
7154 syntax for specifying generic bounds, though the previous syntax
7156 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7158 * Rust [no longer has a runtime][rt] of any description, and only
7159 supports OS threads, not green threads.
7160 * At long last, Rust has been overhauled for 'dynamically-sized
7161 types' ([DST]), which integrates 'fat pointers' (object types,
7162 arrays, and `str`) more deeply into the type system, making it
7164 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7165 `..j` that produce range types and which, when combined with the
7166 `Index` operator and multidispatch, leads to a convenient slice
7168 * The new range syntax revealed an ambiguity in the fixed-length
7169 array syntax, so now fixed length arrays [are written `[T;
7171 * The `Copy` trait is no longer implemented automatically. Unsafe
7172 pointers no longer implement `Sync` and `Send` so types
7173 containing them don't automatically either. `Sync` and `Send`
7174 are now 'unsafe traits' so one can "forcibly" implement them via
7175 `unsafe impl` if a type confirms to the requirements for them
7176 even though the internals do not (e.g. structs containing unsafe
7177 pointers like `Arc`). These changes are intended to prevent some
7178 footguns and are collectively known as [opt-in built-in
7179 traits][oibit] (though `Sync` and `Send` will soon become pure
7180 library types unknown to the compiler).
7181 * Operator traits now take their operands [by value][ops], and
7182 comparison traits can use multidispatch to compare one type
7183 against multiple other types, allowing e.g. `String` to be
7184 compared with `&str`.
7185 * `if let` and `while let` are no longer feature-gated.
7186 * Rust has adopted a more [uniform syntax for escaping unicode
7187 characters][unicode].
7188 * `macro_rules!` [has been declared stable][mac]. Though it is a
7189 flawed system it is sufficiently popular that it must be usable
7190 for 1.0. Effort has gone into [future-proofing][mac-future] it
7191 in ways that will allow other macro systems to be developed in
7192 parallel, and won't otherwise impact the evolution of the
7194 * The prelude has been [pared back significantly][prelude] such
7195 that it is the minimum necessary to support the most pervasive
7196 code patterns, and through [generalized where clauses][where]
7197 many of the prelude extension traits have been consolidated.
7198 * Rust's rudimentary reflection [has been removed][refl], as it
7199 incurred too much code generation for little benefit.
7200 * [Struct variants][structvars] are no longer feature-gated.
7201 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7202 known as 'higher-ranked trait bounds', this crucially allows
7203 unboxed closures to work.
7204 * Macros invocations surrounded by parens or square brackets and
7205 not terminated by a semicolon are [parsed as
7206 expressions][macros], which makes expressions like `vec![1i32,
7207 2, 3].len()` work as expected.
7208 * Trait objects now implement their traits automatically, and
7209 traits that can be coerced to objects now must be [object
7211 * Automatically deriving traits is now done with `#[derive(...)]`
7212 not `#[deriving(...)]` for [consistency with other naming
7213 conventions][derive].
7214 * Importing the containing module or enum at the same time as
7215 items or variants they contain is [now done with `self` instead
7216 of `mod`][self], as in use `foo::{self, bar}`
7217 * Glob imports are no longer feature-gated.
7218 * The `box` operator and `box` patterns have been feature-gated
7219 pending a redesign. For now unique boxes should be allocated
7220 like other containers, with `Box::new`.
7224 * A [series][coll1] of [efforts][coll2] to establish
7225 [conventions][coll3] for collections types has resulted in API
7226 improvements throughout the standard library.
7227 * New [APIs for error handling][err] provide ergonomic interop
7228 between error types, and [new conventions][err-conv] describe
7229 more clearly the recommended error handling strategies in Rust.
7230 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7231 it is easier to discuss failure in the context of error handling
7232 without making clarifications as to whether you are referring to
7233 the 'fail' macro or failure more generally.
7234 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7235 syscall when available.
7236 * The 'serialize' crate has been renamed 'rustc-serialize' and
7237 moved out of the distribution to Cargo. Although it is widely
7238 used now, it is expected to be superseded in the near future.
7239 * The `Show` formatter, typically implemented with
7240 `#[derive(Show)]` is [now requested with the `{:?}`
7241 specifier][show] and is intended for use by all types, for uses
7242 such as `println!` debugging. The new `String` formatter must be
7243 implemented by hand, uses the `{}` specifier, and is intended
7244 for full-fidelity conversions of things that can logically be
7245 represented as strings.
7249 * [Flexible target specification][flex] allows rustc's code
7250 generation to be configured to support otherwise-unsupported
7252 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7253 respective debuggers with Rust-appropriate pretty-printing.
7254 * The Windows installation of Rust is distributed with the
7255 MinGW components currently required to link binaries on that
7260 * Nullable enum optimizations have been extended to more types so
7261 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7262 space than the inner types themselves.
7263 * Work has begun on supporting AArch64.
7265 [Cargo]: https://crates.io
7266 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7267 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7268 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7269 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7270 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7271 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7272 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7273 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7274 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7275 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7276 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7277 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7278 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7279 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7280 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7281 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7282 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7283 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7284 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7285 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7286 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7287 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7288 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7289 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7290 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7291 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7292 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7293 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7294 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7295 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7296 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7297 [trpl]: https://doc.rust-lang.org/book/index.html
7298 [rbe]: http://rustbyexample.com/
7301 Version 0.12.0 (2014-10-09)
7302 =============================
7304 * ~1900 changes, numerous bugfixes
7308 * The introductory documentation (now called The Rust Guide) has
7309 been completely rewritten, as have a number of supplementary
7311 * Rust's package manager, Cargo, continues to improve and is
7312 sometimes considered to be quite awesome.
7313 * Many API's in `std` have been reviewed and updated for
7314 consistency with the in-development Rust coding
7315 guidelines. The standard library documentation tracks
7316 stabilization progress.
7317 * Minor libraries have been moved out-of-tree to the rust-lang org
7318 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7319 be installed with Cargo.
7320 * Lifetime elision allows lifetime annotations to be left off of
7321 function declarations in many common scenarios.
7322 * Rust now works on 64-bit Windows.
7325 * Indexing can be overloaded with the `Index` and `IndexMut`
7327 * The `if let` construct takes a branch only if the `let` pattern
7328 matches, currently behind the 'if_let' feature gate.
7329 * 'where clauses', a more flexible syntax for specifying trait
7330 bounds that is more aesthetic, have been added for traits and
7331 free functions. Where clauses will in the future make it
7332 possible to constrain associated types, which would be
7333 impossible with the existing syntax.
7334 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7335 the 'slicing_syntax' feature gate, and can be overloaded with
7336 the `Slice` or `SliceMut` traits.
7337 * The syntax for matching of sub-slices has been changed to use a
7338 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7339 consistency with other uses of `..` and to future-proof
7340 potential additional uses of the syntax.
7341 * The syntax for matching inclusive ranges in patterns has changed
7342 from `0..3` to `0...4` to be consistent with the exclusive range
7344 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7345 c]`) has been put behind the 'advanced_slice_patterns' feature
7346 gate and may be removed in the future.
7347 * Components of tuples and tuple structs can be extracted using
7348 the `value.0` syntax, currently behind the `tuple_indexing`
7350 * The `#[crate_id]` attribute is no longer supported; versioning
7351 is handled by the package manager.
7352 * Renaming crate imports are now written `extern crate foo as bar`
7353 instead of `extern crate bar = foo`.
7354 * Renaming use statements are now written `use foo as bar` instead
7356 * `let` and `match` bindings and argument names in macros are now
7358 * The new, more efficient, closure types ('unboxed closures') have
7359 been added under a feature gate, 'unboxed_closures'. These will
7360 soon replace the existing closure types, once higher-ranked
7361 trait lifetimes are added to the language.
7362 * `move` has been added as a keyword, for indicating closures
7363 that capture by value.
7364 * Mutation and assignment is no longer allowed in pattern guards.
7365 * Generic structs and enums can now have trait bounds.
7366 * The `Share` trait is now called `Sync` to free up the term
7367 'shared' to refer to 'shared reference' (the default reference
7369 * Dynamically-sized types have been mostly implemented,
7370 unifying the behavior of fat-pointer types with the rest of the
7372 * As part of dynamically-sized types, the `Sized` trait has been
7373 introduced, which qualifying types implement by default, and
7374 which type parameters expect by default. To specify that a type
7375 parameter does not need to be sized, write `<Sized? T>`. Most
7376 types are `Sized`, notable exceptions being unsized arrays
7377 (`[T]`) and trait types.
7378 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
7379 * Lifetime bounds can now be applied to type parameters and object
7381 * The old, reference counted GC type, `Gc<T>` which was once
7382 denoted by the `@` sigil, has finally been removed. GC will be
7383 revisited in the future.
7386 * Library documentation has been improved for a number of modules.
7387 * Bit-vectors, collections::bitv has been modernized.
7388 * The url crate is deprecated in favor of
7389 http://github.com/servo/rust-url, which can be installed with
7391 * Most I/O stream types can be cloned and subsequently closed from
7393 * A `std::time::Duration` type has been added for use in I/O
7394 methods that rely on timers, as well as in the 'time' crate's
7395 `Timespec` arithmetic.
7396 * The runtime I/O abstraction layer that enabled the green thread
7397 scheduler to do non-thread-blocking I/O has been removed, along
7398 with the libuv-based implementation employed by the green thread
7399 scheduler. This will greatly simplify the future I/O work.
7400 * `collections::btree` has been rewritten to have a more
7401 idiomatic and efficient design.
7404 * rustdoc output now indicates the stability levels of API's.
7405 * The `--crate-name` flag can specify the name of the crate
7406 being compiled, like `#[crate_name]`.
7407 * The `-C metadata` specifies additional metadata to hash into
7408 symbol names, and `-C extra-filename` specifies additional
7409 information to put into the output filename, for use by the
7410 package manager for versioning.
7411 * debug info generation has continued to improve and should be
7412 more reliable under both gdb and lldb.
7413 * rustc has experimental support for compiling in parallel
7414 using the `-C codegen-units` flag.
7415 * rustc no longer encodes rpath information into binaries by
7419 * Stack usage has been optimized with LLVM lifetime annotations.
7420 * Official Rust binaries on Linux are more compatible with older
7421 kernels and distributions, built on CentOS 5.10.
7424 Version 0.11.0 (2014-07-02)
7425 ==========================
7427 * ~1700 changes, numerous bugfixes
7430 * ~[T] has been removed from the language. This type is superseded by
7432 * ~str has been removed from the language. This type is superseded by
7434 * ~T has been removed from the language. This type is superseded by the
7436 * @T has been removed from the language. This type is superseded by the
7437 standard library's std::gc::Gc<T> type.
7438 * Struct fields are now all private by default.
7439 * Vector indices and shift amounts are both required to be a `uint`
7440 instead of any integral type.
7441 * Byte character, byte string, and raw byte string literals are now all
7442 supported by prefixing the normal literal with a `b`.
7443 * Multiple ABIs are no longer allowed in an ABI string
7444 * The syntax for lifetimes on closures/procedures has been tweaked
7445 slightly: `<'a>|A, B|: 'b + K -> T`
7446 * Floating point modulus has been removed from the language; however it
7447 is still provided by a library implementation.
7448 * Private enum variants are now disallowed.
7449 * The `priv` keyword has been removed from the language.
7450 * A closure can no longer be invoked through a &-pointer.
7451 * The `use foo, bar, baz;` syntax has been removed from the language.
7452 * The transmute intrinsic no longer works on type parameters.
7453 * Statics now allow blocks/items in their definition.
7454 * Trait bounds are separated from objects with + instead of : now.
7455 * Objects can no longer be read while they are mutably borrowed.
7456 * The address of a static is now marked as insignificant unless the
7457 #[inline(never)] attribute is placed it.
7458 * The #[unsafe_destructor] attribute is now behind a feature gate.
7459 * Struct literals are no longer allowed in ambiguous positions such as
7460 if, while, match, and for..in.
7461 * Declaration of lang items and intrinsics are now feature-gated by
7463 * Integral literals no longer default to `int`, and floating point
7464 literals no longer default to `f64`. Literals must be suffixed with an
7465 appropriate type if inference cannot determine the type of the
7467 * The Box<T> type is no longer implicitly borrowed to &mut T.
7468 * Procedures are now required to not capture borrowed references.
7471 * The standard library is now a "facade" over a number of underlying
7472 libraries. This means that development on the standard library should
7473 be speedier due to smaller crates, as well as a clearer line between
7475 * A new library, libcore, lives under the standard library's facade
7476 which is Rust's "0-assumption" library, suitable for embedded and
7477 kernel development for example.
7478 * A regex crate has been added to the standard distribution. This crate
7479 includes statically compiled regular expressions.
7480 * The unwrap/unwrap_err methods on Result require a Show bound for
7481 better error messages.
7482 * The return types of the std::comm primitives have been centralized
7483 around the Result type.
7484 * A number of I/O primitives have gained the ability to time out their
7486 * A number of I/O primitives have gained the ability to close their
7487 reading/writing halves to cancel pending operations.
7488 * Reverse iterator methods have been removed in favor of `rev()` on
7489 their forward-iteration counterparts.
7490 * A bitflags! macro has been added to enable easy interop with C and
7491 management of bit flags.
7492 * A debug_assert! macro is now provided which is disabled when
7493 `--cfg ndebug` is passed to the compiler.
7494 * A graphviz crate has been added for creating .dot files.
7495 * The std::cast module has been migrated into std::mem.
7496 * The std::local_data api has been migrated from freestanding functions
7497 to being based on methods.
7498 * The Pod trait has been renamed to Copy.
7499 * jemalloc has been added as the default allocator for types.
7500 * The API for allocating memory has been changed to use proper alignment
7501 and sized deallocation
7502 * Connecting a TcpStream or binding a TcpListener is now based on a
7503 string address and a u16 port. This allows connecting to a hostname as
7505 * The Reader trait now contains a core method, read_at_least(), which
7506 correctly handles many repeated 0-length reads.
7507 * The process-spawning API is now centered around a builder-style
7509 * The :? printing qualifier has been moved from the standard library to
7510 an external libdebug crate.
7511 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
7512 have been renamed to Eq/Ord.
7513 * The select/plural methods have been removed from format!. The escapes
7514 for { and } have also changed from \{ and \} to {{ and }},
7516 * The TaskBuilder API has been re-worked to be a true builder, and
7517 extension traits for spawning native/green tasks have been added.
7520 * All breaking changes to the language or libraries now have their
7521 commit message annotated with `[breaking-change]` to allow for easy
7522 discovery of breaking changes.
7523 * The compiler will now try to suggest how to annotate lifetimes if a
7524 lifetime-related error occurs.
7525 * Debug info continues to be improved greatly with general bug fixes and
7526 better support for situations like link time optimization (LTO).
7527 * Usage of syntax extensions when cross-compiling has been fixed.
7528 * Functionality equivalent to GCC & Clang's -ffunction-sections,
7529 -fdata-sections and --gc-sections has been enabled by default
7530 * The compiler is now stricter about where it will load module files
7531 from when a module is declared via `mod foo;`.
7532 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
7533 Syntax extensions are now discovered via a "plugin registrar" type
7534 which will be extended in the future to other various plugins.
7535 * Lints have been restructured to allow for dynamically loadable lints.
7536 * A number of rustdoc improvements:
7537 * The HTML output has been visually redesigned.
7538 * Markdown is now powered by hoedown instead of sundown.
7539 * Searching heuristics have been greatly improved.
7540 * The search index has been reduced in size by a great amount.
7541 * Cross-crate documentation via `pub use` has been greatly improved.
7542 * Primitive types are now hyperlinked and documented.
7543 * Documentation has been moved from static.rust-lang.org/doc to
7545 * A new sandbox, play.rust-lang.org, is available for running and
7546 sharing rust code examples on-line.
7547 * Unused attributes are now more robustly warned about.
7548 * The dead_code lint now warns about unused struct fields.
7549 * Cross-compiling to iOS is now supported.
7550 * Cross-compiling to mipsel is now supported.
7551 * Stability attributes are now inherited by default and no longer apply
7552 to intra-crate usage, only inter-crate usage.
7553 * Error message related to non-exhaustive match expressions have been
7557 Version 0.10 (2014-04-03)
7558 =========================
7560 * ~1500 changes, numerous bugfixes
7563 * A new RFC process is now in place for modifying the language.
7564 * Patterns with `@`-pointers have been removed from the language.
7565 * Patterns with unique vectors (`~[T]`) have been removed from the
7567 * Patterns with unique strings (`~str`) have been removed from the
7569 * `@str` has been removed from the language.
7570 * `@[T]` has been removed from the language.
7571 * `@self` has been removed from the language.
7572 * `@Trait` has been removed from the language.
7573 * Headers on `~` allocations which contain `@` boxes inside the type for
7574 reference counting have been removed.
7575 * The semantics around the lifetimes of temporary expressions have changed,
7576 see #3511 and #11585 for more information.
7577 * Cross-crate syntax extensions are now possible, but feature gated. See
7578 #11151 for more information. This includes both `macro_rules!` macros as
7579 well as syntax extensions such as `format!`.
7580 * New lint modes have been added, and older ones have been turned on to be
7582 * Unnecessary parentheses
7585 * Uppercase variables
7586 * Publicly visible private types
7587 * `#[deriving]` with raw pointers
7588 * Unsafe functions can no longer be coerced to closures.
7589 * Various obscure macros such as `log_syntax!` are now behind feature gates.
7590 * The `#[simd]` attribute is now behind a feature gate.
7591 * Visibility is no longer allowed on `extern crate` statements, and
7592 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
7593 * Trailing commas are now allowed in argument lists and tuple patterns.
7594 * The `do` keyword has been removed, it is now a reserved keyword.
7595 * Default type parameters have been implemented, but are feature gated.
7596 * Borrowed variables through captures in closures are now considered soundly.
7597 * `extern mod` is now `extern crate`
7598 * The `Freeze` trait has been removed.
7599 * The `Share` trait has been added for types that can be shared among
7601 * Labels in macros are now hygienic.
7602 * Expression/statement macro invocations can be delimited with `{}` now.
7603 * Treatment of types allowed in `static mut` locations has been tweaked.
7604 * The `*` and `.` operators are now overloadable through the `Deref` and
7606 * `~Trait` and `proc` no longer have `Send` bounds by default.
7607 * Partial type hints are now supported with the `_` type marker.
7608 * An `Unsafe` type was introduced for interior mutability. It is now
7609 considered undefined to transmute from `&T` to `&mut T` without using the
7611 * The #[linkage] attribute was implemented for extern statics/functions.
7612 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
7613 * `Pod` was renamed to `Copy`.
7616 * The `libextra` library has been removed. It has now been decomposed into
7617 component libraries with smaller and more focused nuggets of
7618 functionality. The full list of libraries can be found on the
7619 documentation index page.
7620 * std: `std::condition` has been removed. All I/O errors are now propagated
7621 through the `Result` type. In order to assist with error handling, a
7622 `try!` macro for unwrapping errors with an early return and a lint for
7623 unused results has been added. See #12039 for more information.
7624 * std: The `vec` module has been renamed to `slice`.
7625 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
7626 This will become the only growable vector in the future.
7627 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
7628 are now found at `std::io::BufferedReader` instead of
7629 `std::io::buffered::BufferedReader`.
7630 * std: `print` and `println` are no longer in the prelude, the `print!` and
7631 `println!` macros are intended to be used instead.
7632 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
7633 attempts to statically prevent cycles.
7634 * std: The standard distribution is adopting the policy of pushing failure
7635 to the user rather than failing in libraries. Many functions (such as
7636 `slice::last()`) now return `Option<T>` instead of `T` + failing.
7637 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
7638 deriving mode: `#[deriving(Show)]`.
7639 * std: `ToStr` is now implemented for all types implementing `Show`.
7640 * std: The formatting trait methods now take `&self` instead of `&T`
7641 * std: The `invert()` method on iterators has been renamed to `rev()`
7642 * std: `std::num` has seen a reduction in the genericity of its traits,
7643 consolidating functionality into a few core traits.
7644 * std: Backtraces are now printed on task failure if the environment
7645 variable `RUST_BACKTRACE` is present.
7646 * std: Naming conventions for iterators have been standardized. More details
7647 can be found on the wiki's style guide.
7648 * std: `eof()` has been removed from the `Reader` trait. Specific types may
7649 still implement the function.
7650 * std: Networking types are now cloneable to allow simultaneous reads/writes.
7651 * std: `assert_approx_eq!` has been removed
7652 * std: The `e` and `E` formatting specifiers for floats have been added to
7653 print them in exponential notation.
7654 * std: The `Times` trait has been removed
7655 * std: Indications of variance and opting out of builtin bounds is done
7656 through marker types in `std::kinds::marker` now
7657 * std: `hash` has been rewritten, `IterBytes` has been removed, and
7658 `#[deriving(Hash)]` is now possible.
7659 * std: `SharedChan` has been removed, `Sender` is now cloneable.
7660 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
7661 * std: `Chan::new` is now `channel()`.
7662 * std: A new synchronous channel type has been implemented.
7663 * std: A `select!` macro is now provided for selecting over `Receiver`s.
7664 * std: `hashmap` and `trie` have been moved to `libcollections`
7665 * std: `run` has been rolled into `io::process`
7666 * std: `assert_eq!` now uses `{}` instead of `{:?}`
7667 * std: The equality and comparison traits have seen some reorganization.
7668 * std: `rand` has moved to `librand`.
7669 * std: `to_{lower,upper}case` has been implemented for `char`.
7670 * std: Logging has been moved to `liblog`.
7671 * collections: `HashMap` has been rewritten for higher performance and less
7673 * native: The default runtime is now `libnative`. If `libgreen` is desired,
7674 it can be booted manually. The runtime guide has more information and
7676 * native: All I/O functionality except signals has been implemented.
7677 * green: Task spawning with `libgreen` has been optimized with stack caching
7678 and various trimming of code.
7679 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
7680 * sync: The `extra::sync` module has been updated to modern rust (and moved
7681 to the `sync` library), tweaking and improving various interfaces while
7682 dropping redundant functionality.
7683 * sync: A new `Barrier` type has been added to the `sync` library.
7684 * sync: An efficient mutex for native and green tasks has been implemented.
7685 * serialize: The `base64` module has seen some improvement. It treats
7686 newlines better, has non-string error values, and has seen general
7688 * fourcc: A `fourcc!` macro was introduced
7689 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
7690 hexadecimal literal.
7693 * `rustpkg` has been deprecated and removed from the main repository. Its
7694 replacement, `cargo`, is under development.
7695 * Nightly builds of rust are now available
7696 * The memory usage of rustc has been improved many times throughout this
7698 * The build process supports disabling rpath support for the rustc binary
7700 * Code generation has improved in some cases, giving more information to the
7701 LLVM optimization passes to enable more extensive optimizations.
7702 * Debuginfo compatibility with lldb on OSX has been restored.
7703 * The master branch is now gated on an android bot, making building for
7704 android much more reliable.
7705 * Output flags have been centralized into one `--emit` flag.
7706 * Crate type flags have been centralized into one `--crate-type` flag.
7707 * Codegen flags have been consolidated behind a `-C` flag.
7708 * Linking against outdated crates now has improved error messages.
7709 * Error messages with lifetimes will often suggest how to annotate the
7710 function to fix the error.
7711 * Many more types are documented in the standard library, and new guides
7713 * Many `rustdoc` improvements:
7714 * code blocks are syntax highlighted.
7715 * render standalone markdown files.
7716 * the --test flag tests all code blocks by default.
7717 * exported macros are displayed.
7718 * re-exported types have their documentation inlined at the location of the
7720 * search works across crates that have been rendered to the same output
7724 Version 0.9 (2014-01-09)
7725 ==========================
7727 * ~1800 changes, numerous bugfixes
7730 * The `float` type has been removed. Use `f32` or `f64` instead.
7731 * A new facility for enabling experimental features (feature gating) has
7732 been added, using the crate-level `#[feature(foo)]` attribute.
7733 * Managed boxes (@) are now behind a feature gate
7734 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
7735 standard library's `Gc` or `Rc` types instead.
7736 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
7737 * Jumping back to the top of a loop is now done with `continue` instead of
7739 * Strings can no longer be mutated through index assignment.
7740 * Raw strings can be created via the basic `r"foo"` syntax or with matched
7741 hash delimiters, as in `r###"foo"###`.
7742 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
7744 * The `&fn` type is now written `|args| -> ret` to match the literal form.
7745 * `@fn`s have been removed.
7746 * `do` only works with procs in order to make it obvious what the cost
7748 * Single-element tuple-like structs can no longer be dereferenced to
7749 obtain the inner value. A more comprehensive solution for overloading
7750 the dereference operator will be provided in the future.
7751 * The `#[link(...)]` attribute has been replaced with
7752 `#[crate_id = "name#vers"]`.
7753 * Empty `impl`s must be terminated with empty braces and may not be
7754 terminated with a semicolon.
7755 * Keywords are no longer allowed as lifetime names; the `self` lifetime
7756 no longer has any special meaning.
7757 * The old `fmt!` string formatting macro has been removed.
7758 * `printf!` and `printfln!` (old-style formatting) removed in favor of
7759 `print!` and `println!`.
7760 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
7761 * The `extern mod foo (name = "bar")` syntax has been removed. Use
7762 `extern mod foo = "bar"` instead.
7763 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
7764 * Macros can have attributes.
7765 * Macros can expand to items with attributes.
7766 * Macros can expand to multiple items.
7767 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
7768 * Comments may be nested.
7769 * Values automatically coerce to trait objects they implement, without
7771 * Enum discriminants are no longer an entire word but as small as needed to
7772 contain all the variants. The `repr` attribute can be used to override
7773 the discriminant size, as in `#[repr(int)]` for integer-sized, and
7774 `#[repr(C)]` to match C enums.
7775 * Non-string literals are not allowed in attributes (they never worked).
7776 * The FFI now supports variadic functions.
7777 * Octal numeric literals, as in `0o7777`.
7778 * The `concat!` syntax extension performs compile-time string concatenation.
7779 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
7780 removed as Rust no longer uses segmented stacks.
7781 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
7782 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
7783 not `*`; ignoring remaining fields of a struct is also done with `..`,
7784 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
7785 * `rustc` supports the "win64" calling convention via `extern "win64"`.
7786 * `rustc` supports the "system" calling convention, which defaults to the
7787 preferred convention for the target platform, "stdcall" on 32-bit Windows,
7789 * The `type_overflow` lint (default: warn) checks literals for overflow.
7790 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
7791 * The `attribute_usage` lint (default: warn) warns about unknown
7793 * The `unknown_features` lint (default: warn) warns about unknown
7795 * The `dead_code` lint (default: warn) checks for dead code.
7796 * Rust libraries can be linked statically to one another
7797 * `#[link_args]` is behind the `link_args` feature gate.
7798 * Native libraries are now linked with `#[link(name = "foo")]`
7799 * Native libraries can be statically linked to a rust crate
7800 (`#[link(name = "foo", kind = "static")]`).
7801 * Native OS X frameworks are now officially supported
7802 (`#[link(name = "foo", kind = "framework")]`).
7803 * The `#[thread_local]` attribute creates thread-local (not task-local)
7804 variables. Currently behind the `thread_local` feature gate.
7805 * The `return` keyword may be used in closures.
7806 * Types that can be copied via a memcpy implement the `Pod` kind.
7807 * The `cfg` attribute can now be used on struct fields and enum variants.
7810 * std: The `option` and `result` API's have been overhauled to make them
7811 simpler, more consistent, and more composable.
7812 * std: The entire `std::io` module has been replaced with one that is
7813 more comprehensive and that properly interfaces with the underlying
7814 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
7816 * std: `io::util` contains a number of useful implementations of
7817 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
7818 `ZeroReader`, `TeeReader`.
7819 * std: The reference counted pointer type `extra::rc` moved into std.
7820 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
7821 just a wrapper around it).
7822 * std: The `Either` type has been removed.
7823 * std: `fmt::Default` can be implemented for any type to provide default
7824 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
7825 * std: The `rand` API continues to be tweaked.
7826 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
7827 on failure in gdb, is now named `rust_fail`.
7828 * std: The `each_key` and `each_value` methods on `HashMap` have been
7829 replaced by the `keys` and `values` iterators.
7830 * std: Functions dealing with type size and alignment have moved from the
7831 `sys` module to the `mem` module.
7832 * std: The `path` module was written and API changed.
7833 * std: `str::from_utf8` has been changed to cast instead of allocate.
7834 * std: `starts_with` and `ends_with` methods added to vectors via the
7835 `ImmutableEqVector` trait, which is in the prelude.
7836 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
7837 if the index is out of bounds.
7838 * std: Task failure no longer propagates between tasks, as the model was
7839 complex, expensive, and incompatible with thread-based tasks.
7840 * std: The `Any` type can be used for dynamic typing.
7841 * std: `~Any` can be passed to the `fail!` macro and retrieved via
7843 * std: Methods that produce iterators generally do not have an `_iter`
7845 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
7846 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
7847 * std: `util::ignore` renamed to `prelude::drop`.
7848 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
7850 * std: `vec::raw` has seen a lot of cleanup and API changes.
7851 * std: The standard library no longer includes any C++ code, and very
7852 minimal C, eliminating the dependency on libstdc++.
7853 * std: Runtime scheduling and I/O functionality has been factored out into
7854 extensible interfaces and is now implemented by two different crates:
7855 libnative, for native threading and I/O; and libgreen, for green threading
7856 and I/O. This paves the way for using the standard library in more limited
7857 embedded environments.
7858 * std: The `comm` module has been rewritten to be much faster, have a
7859 simpler, more consistent API, and to work for both native and green
7861 * std: All libuv dependencies have been moved into the rustuv crate.
7862 * native: New implementations of runtime scheduling on top of OS threads.
7863 * native: New native implementations of TCP, UDP, file I/O, process spawning,
7865 * green: The green thread scheduler and message passing types are almost
7867 * extra: The `flatpipes` module had bitrotted and was removed.
7868 * extra: All crypto functions have been removed and Rust now has a policy of
7869 not reimplementing crypto in the standard library. In the future crypto
7870 will be provided by external crates with bindings to established libraries.
7871 * extra: `c_vec` has been modernized.
7872 * extra: The `sort` module has been removed. Use the `sort` method on
7876 * The `rust` and `rusti` commands have been removed, due to lack of
7878 * `rustdoc` was completely rewritten.
7879 * `rustdoc` can test code examples in documentation.
7880 * `rustpkg` can test packages with the argument, 'test'.
7881 * `rustpkg` supports arbitrary dependencies, including C libraries.
7882 * `rustc`'s support for generating debug info is improved again.
7883 * `rustc` has better error reporting for unbalanced delimiters.
7884 * `rustc`'s JIT support was removed due to bitrot.
7885 * Executables and static libraries can be built with LTO (-Z lto)
7886 * `rustc` adds a `--dep-info` flag for communicating dependencies to
7890 Version 0.8 (2013-09-26)
7891 ============================
7893 * ~2200 changes, numerous bugfixes
7896 * The `for` loop syntax has changed to work with the `Iterator` trait.
7897 * At long last, unwinding works on Windows.
7898 * Default methods are ready for use.
7899 * Many trait inheritance bugs fixed.
7900 * Owned and borrowed trait objects work more reliably.
7901 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
7902 * rustc can omit emission of code for the `debug!` macro if it is passed
7904 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
7905 for foo.rs, then foo/mod.rs, and will generate an error when both are
7907 * Strings no longer contain trailing nulls. The new `std::c_str` module
7908 provides new mechanisms for converting to C strings.
7909 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
7910 * The FFI has been overhauled such that foreign functions are called directly,
7911 instead of through a stack-switching wrapper.
7912 * Calling a foreign function must be done through a Rust function with the
7913 `#[fixed_stack_segment]` attribute.
7914 * The `externfn!` macro can be used to declare both a foreign function and
7915 a `#[fixed_stack_segment]` wrapper at once.
7916 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
7917 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
7918 * `priv` is disallowed everywhere except for struct fields and enum variants.
7919 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
7920 * `ref` bindings in irrefutable patterns work correctly now.
7921 * `char` is now prevented from containing invalid code points.
7922 * Casting to `bool` is no longer allowed.
7923 * `\0` is now accepted as an escape in chars and strings.
7924 * `yield` is a reserved keyword.
7925 * `typeof` is a reserved keyword.
7926 * Crates may be imported by URL with `extern mod foo = "url";`.
7927 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
7928 * Static vectors can be initialized with repeating elements,
7929 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
7930 * Static structs can be initialized with functional record update,
7931 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
7932 * `cfg!` can be used to conditionally execute code based on the crate
7933 configuration, similarly to `#[cfg(...)]`.
7934 * The `unnecessary_qualification` lint detects unneeded module
7935 prefixes (default: allow).
7936 * Arithmetic operations have been implemented on the SIMD types in
7937 `std::unstable::simd`.
7938 * Exchange allocation headers were removed, reducing memory usage.
7939 * `format!` implements a completely new, extensible, and higher-performance
7940 string formatting system. It will replace `fmt!`.
7941 * `print!` and `println!` write formatted strings (using the `format!`
7942 extension) to stdout.
7943 * `write!` and `writeln!` write formatted strings (using the `format!`
7944 extension) to the new Writers in `std::rt::io`.
7945 * The library section in which a function or static is placed may
7946 be specified with `#[link_section = "..."]`.
7947 * The `proto!` syntax extension for defining bounded message protocols
7949 * `macro_rules!` is hygienic for `let` declarations.
7950 * The `#[export_name]` attribute specifies the name of a symbol.
7951 * `unreachable!` can be used to indicate unreachable code, and fails
7955 * std: Transitioned to the new runtime, written in Rust.
7956 * std: Added an experimental I/O library, `rt::io`, based on the new
7958 * std: A new generic `range` function was added to the prelude, replacing
7959 `uint::range` and friends.
7960 * std: `range_rev` no longer exists. Since range is an iterator it can be
7961 reversed with `range(lo, hi).invert()`.
7962 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
7963 renamed to `unwrap_or`.
7964 * std: The `iterator` module was renamed to `iter`.
7965 * std: Integral types now support the `checked_add`, `checked_sub`, and
7966 `checked_mul` operations for detecting overflow.
7967 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
7969 * std: Methods are standardizing on conventions for casting methods:
7970 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
7972 * std: The `CString` type in `c_str` provides new ways to convert to and
7974 * std: `DoubleEndedIterator` can yield elements in two directions.
7975 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
7977 * std: `str::from_bytes` renamed to `str::from_utf8`.
7978 * std: `pop_opt` and `shift_opt` methods added to vectors.
7979 * std: The task-local data interface no longer uses @, and keys are
7980 no longer function pointers.
7981 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
7982 * std: Added `SharedPort` to `comm`.
7983 * std: `Eq` has a default method for `ne`; only `eq` is required
7985 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
7986 is required in implementations.
7987 * std: `is_utf8` performance is improved, impacting many string functions.
7988 * std: `os::MemoryMap` provides cross-platform mmap.
7989 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
7990 are not 'in-bounds' are considered undefined.
7991 * std: Many freestanding functions in `vec` removed in favor of methods.
7992 * std: Many freestanding functions on scalar types removed in favor of
7994 * std: Many options to task builders were removed since they don't make
7995 sense in the new scheduler design.
7996 * std: More containers implement `FromIterator` so can be created by the
7998 * std: More complete atomic types in `unstable::atomics`.
7999 * std: `comm::PortSet` removed.
8000 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8001 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8002 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8003 default implementations.
8004 * std: Various `from_str` functions were removed in favor of a generic
8005 `from_str` which is available in the prelude.
8006 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8007 * extra: `dlist`, the doubly-linked list was modernized.
8008 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8009 * extra: Added `glob` module, replacing `std::os::glob`.
8010 * extra: `rope` was removed.
8011 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8012 * extra: `net`, and `timer` were removed. The experimental replacements
8013 are `std::rt::io::net` and `std::rt::io::timer`.
8014 * extra: Iterators implemented for `SmallIntMap`.
8015 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8016 * extra: `SmallIntSet` removed. Use `BitvSet`.
8017 * extra: Performance of JSON parsing greatly improved.
8018 * extra: `semver` updated to SemVer 2.0.0.
8019 * extra: `term` handles more terminals correctly.
8020 * extra: `dbg` module removed.
8021 * extra: `par` module removed.
8022 * extra: `future` was cleaned up, with some method renames.
8023 * extra: Most free functions in `getopts` were converted to methods.
8026 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8027 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8028 similarly to gcc's `--march` flag.
8029 * rustc's performance compiling small crates is much better.
8030 * rustpkg has received many improvements.
8031 * rustpkg supports git tags as package IDs.
8032 * rustpkg builds into target-specific directories so it can be used for
8034 * The number of concurrent test tasks is controlled by the environment
8035 variable RUST_TEST_TASKS.
8036 * The test harness can now report metrics for benchmarks.
8037 * All tools have man pages.
8038 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8039 * The runtime uses jemalloc for allocations.
8040 * Segmented stacks are temporarily disabled as part of the transition to
8041 the new runtime. Stack overflows are possible!
8042 * A new documentation backend, rustdoc_ng, is available for use. It is
8043 still invoked through the normal `rustdoc` command.
8046 Version 0.7 (2013-07-03)
8047 =======================
8049 * ~2000 changes, numerous bugfixes
8052 * `impl`s no longer accept a visibility qualifier. Put them on methods
8054 * The borrow checker has been rewritten with flow-sensitivity, fixing
8055 many bugs and inconveniences.
8056 * The `self` parameter no longer implicitly means `&'self self`,
8057 and can be explicitly marked with a lifetime.
8058 * Overloadable compound operators (`+=`, etc.) have been temporarily
8059 removed due to bugs.
8060 * The `for` loop protocol now requires `for`-iterators to return `bool`
8061 so they compose better.
8062 * The `Durable` trait is replaced with the `'static` bounds.
8063 * Trait default methods work more often.
8064 * Structs with the `#[packed]` attribute have byte alignment and
8065 no padding between fields.
8066 * Type parameters bound by `Copy` must now be copied explicitly with
8068 * It is now illegal to move out of a dereferenced unsafe pointer.
8069 * `Option<~T>` is now represented as a nullable pointer.
8070 * `@mut` does dynamic borrow checks correctly.
8071 * The `main` function is only detected at the topmost level of the crate.
8072 The `#[main]` attribute is still valid anywhere.
8073 * Struct fields may no longer be mutable. Use inherited mutability.
8074 * The `#[no_send]` attribute makes a type that would otherwise be
8076 * The `#[no_freeze]` attribute makes a type that would otherwise be
8078 * Unbounded recursion will abort the process after reaching the limit
8079 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8080 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8081 are never implicitly copyable.
8082 * `#[static_assert]` makes compile-time assertions about static bools.
8083 * At long last, 'argument modes' no longer exist.
8084 * The rarely used `use mod` statement no longer exists.
8087 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8089 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8090 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8092 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8093 and unsuffixed integer literals.
8096 * The `core` crate was renamed to `std`.
8097 * The `std` crate was renamed to `extra`.
8098 * More and improved documentation.
8099 * std: `iterator` module for external iterator objects.
8100 * Many old-style (internal, higher-order function) iterators replaced by
8101 implementations of `Iterator`.
8102 * std: Many old internal vector and string iterators,
8103 incl. `any`, `all`. removed.
8104 * std: The `finalize` method of `Drop` renamed to `drop`.
8105 * std: The `drop` method now takes `&mut self` instead of `&self`.
8106 * std: The prelude no longer re-exports any modules, only types and traits.
8107 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8108 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8109 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8110 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8111 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8112 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8113 * std: Many types implement `Clone`.
8114 * std: `path` type renamed to `Path`.
8115 * std: `mut` module and `Mut` type removed.
8116 * std: Many standalone functions removed in favor of methods and iterators
8117 in `vec`, `str`. In the future methods will also work as functions.
8118 * std: `reinterpret_cast` removed. Use `transmute`.
8119 * std: ascii string handling in `std::ascii`.
8120 * std: `Rand` is implemented for ~/@.
8121 * std: `run` module for spawning processes overhauled.
8122 * std: Various atomic types added to `unstable::atomic`.
8123 * std: Various types implement `Zero`.
8124 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8125 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8126 * std: Added `os::mkdir_recursive`.
8127 * std: Added `os::glob` function performs filesystems globs.
8128 * std: `FuzzyEq` renamed to `ApproxEq`.
8129 * std: `Map` now defines `pop` and `swap` methods.
8130 * std: `Cell` constructors converted to static methods.
8131 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8132 * extra: `flate` module moved from `std` to `extra`.
8133 * extra: `fileinput` module for iterating over a series of files.
8134 * extra: `Complex` number type and `complex` module.
8135 * extra: `Rational` number type and `rational` module.
8136 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8137 * extra: `term` uses terminfo now, is more correct.
8138 * extra: `arc` functions converted to methods.
8139 * extra: Implementation of fixed output size variations of SHA-2.
8142 * `unused_variables` lint mode for unused variables (default: warn).
8143 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8145 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8147 * `dead_assignment` lint mode for unread variables (default: warn).
8148 * `unnecessary_allocation` lint mode detects some heap allocations that are
8149 immediately borrowed so could be written without allocating (default: warn).
8150 * `missing_doc` lint mode (default: allow).
8151 * `unreachable_code` lint mode (default: warn).
8152 * The `rusti` command has been rewritten and a number of bugs addressed.
8153 * rustc outputs in color on more terminals.
8154 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8155 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8156 * Compiling with `-g` will make the binary record information about
8157 dynamic borrowcheck failures for debugging.
8158 * rustdoc has a nicer stylesheet.
8159 * Various improvements to rustdoc.
8160 * Improvements to rustpkg (see the detailed release notes).
8163 Version 0.6 (2013-04-03)
8164 ========================
8166 * ~2100 changes, numerous bugfixes
8169 * The self type parameter in traits is now spelled `Self`
8170 * The `self` parameter in trait and impl methods must now be explicitly
8171 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8172 * Static methods no longer require the `static` keyword and instead
8173 are distinguished by the lack of a `self` parameter
8174 * Replaced the `Durable` trait with the `'static` lifetime
8175 * The old closure type syntax with the trailing sigil has been
8176 removed in favor of the more consistent leading sigil
8177 * `super` is a keyword, and may be prefixed to paths
8178 * Trait bounds are separated with `+` instead of whitespace
8179 * Traits are implemented with `impl Trait for Type`
8180 instead of `impl Type: Trait`
8181 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8182 * The `export` keyword has finally been removed
8183 * The `move` keyword has been removed (see "Semantic changes")
8184 * The interior mutability qualifier on vectors, `[mut T]`, has been
8185 removed. Use `&mut [T]`, etc.
8186 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8187 * `fail` is no longer a keyword. Use `fail!()`
8188 * `assert` is no longer a keyword. Use `assert!()`
8189 * `log` is no longer a keyword. use `debug!`, etc.
8190 * 1-tuples may be represented as `(T,)`
8191 * Struct fields may no longer be `mut`. Use inherited mutability,
8192 `@mut T`, `core::mut` or `core::cell`
8193 * `extern mod { ... }` is no longer valid syntax for foreign
8194 function modules. Use extern blocks: `extern { ... }`
8195 * Newtype enums removed. Use tuple-structs.
8196 * Trait implementations no longer support visibility modifiers
8197 * Pattern matching over vectors improved and expanded
8198 * `const` renamed to `static` to correspond to lifetime name,
8199 and make room for future `static mut` unsafe mutable globals.
8200 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8201 * `Clone` implementations can be automatically generated with
8202 `#[deriving(Clone)]`
8203 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8204 instead of `foo as Bar`.
8205 * Fixed length vector types are now written as `[int, .. 3]`
8206 instead of `[int * 3]`.
8207 * Fixed length vector types can express the length as a constant
8208 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8211 * Types with owned pointers or custom destructors move by default,
8212 eliminating the `move` keyword
8213 * All foreign functions are considered unsafe
8214 * &mut is now unaliasable
8215 * Writes to borrowed @mut pointers are prevented dynamically
8217 * The name of the main function can be customized using #[main]
8218 * The default type of an inferred closure is &fn instead of @fn
8219 * `use` statements may no longer be "chained" - they cannot import
8220 identifiers imported by previous `use` statements
8221 * `use` statements are crate relative, importing from the "top"
8222 of the crate by default. Paths may be prefixed with `super::`
8223 or `self::` to change the search behavior.
8224 * Method visibility is inherited from the implementation declaration
8225 * Structural records have been removed
8226 * Many more types can be used in static items, including enums
8227 'static-lifetime pointers and vectors
8228 * Pattern matching over vectors improved and expanded
8229 * Typechecking of closure types has been overhauled to
8230 improve inference and eliminate unsoundness
8231 * Macros leave scope at the end of modules, unless that module is
8232 tagged with #[macro_escape]
8235 * Added big integers to `std::bigint`
8236 * Removed `core::oldcomm` module
8237 * Added pipe-based `core::comm` module
8238 * Numeric traits have been reorganized under `core::num`
8239 * `vec::slice` finally returns a slice
8240 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8241 * Containers reorganized around traits in `core::container`
8242 * `core::dvec` removed, `~[T]` is a drop-in replacement
8243 * `core::send_map` renamed to `core::hashmap`
8244 * `std::map` removed; replaced with `core::hashmap`
8245 * `std::treemap` reimplemented as an owned balanced tree
8246 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8247 * `core::trie` added as a fast ordered map for integer keys
8248 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8249 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8250 overload the comparison operators, whereas `TotalOrd` is used
8251 by certain container types
8254 * Replaced the 'cargo' package manager with 'rustpkg'
8255 * Added all-purpose 'rust' tool
8256 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8257 * rustc now *attempts* to offer spelling suggestions
8258 * Improved support for ARM and Android
8259 * Preliminary MIPS backend
8260 * Improved foreign function ABI implementation for x86, x86_64
8261 * Various memory usage improvements
8262 * Rust code may be embedded in foreign code under limited circumstances
8263 * Inline assembler supported by new asm!() syntax extension.
8266 Version 0.5 (2012-12-21)
8267 ===========================
8269 * ~900 changes, numerous bugfixes
8272 * Removed `<-` move operator
8273 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8274 * Removed old fixed length vector syntax - `[T]/N`
8275 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8276 * Macros may now expand to items and statements
8277 * `a.b()` is always parsed as a method call, never as a field projection
8278 * `Eq` and `IterBytes` implementations can be automatically generated
8279 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8280 * Removed the special crate language for `.rc` files
8281 * Function arguments may consist of any irrefutable pattern
8284 * `&` and `~` pointers may point to objects
8285 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8286 * Enum variants may be structs
8287 * Destructors can be added to all nominal types with the Drop trait
8288 * Structs and nullary enum variants may be constants
8289 * Values that cannot be implicitly copied are now automatically moved
8290 without writing `move` explicitly
8291 * `&T` may now be coerced to `*T`
8292 * Coercions happen in `let` statements as well as function calls
8293 * `use` statements now take crate-relative paths
8294 * The module and type namespaces have been merged so that static
8295 method names can be resolved under the trait in which they are
8298 * Improved support for language features
8299 * Trait inheritance works in many scenarios
8300 * More support for explicit self arguments in methods - `self`, `&self`
8301 `@self`, and `~self` all generally work as expected
8302 * Static methods work in more situations
8303 * Experimental: Traits may declare default methods for the implementations
8307 * New condition handling system in `core::condition`
8308 * Timsort added to `std::sort`
8309 * New priority queue, `std::priority_queue`
8310 * Pipes for serializable types, `std::flatpipes'
8311 * Serialization overhauled to be trait-based
8312 * Expanded `getopts` definitions
8313 * Moved futures to `std`
8314 * More functions are pure now
8315 * `core::comm` renamed to `oldcomm`. Still deprecated
8316 * `rustdoc` and `cargo` are libraries now
8319 * Added a preliminary REPL, `rusti`
8320 * License changed from MIT to dual MIT/APL2
8323 Version 0.4 (2012-10-15)
8324 ==========================
8326 * ~2000 changes, numerous bugfixes
8329 * All keywords are now strict and may not be used as identifiers anywhere
8330 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8331 'of', 'with', 'to', 'class'.
8332 * Classes are replaced with simpler structs
8333 * Explicit method self types
8334 * `ret` became `return` and `alt` became `match`
8335 * `import` is now `use`; `use is now `extern mod`
8336 * `extern mod { ... }` is now `extern { ... }`
8337 * `use mod` is the recommended way to import modules
8338 * `pub` and `priv` replace deprecated export lists
8339 * The syntax of `match` pattern arms now uses fat arrow (=>)
8340 * `main` no longer accepts an args vector; use `os::args` instead
8343 * Trait implementations are now coherent, ala Haskell typeclasses
8344 * Trait methods may be static
8345 * Argument modes are deprecated
8346 * Borrowed pointers are much more mature and recommended for use
8347 * Strings and vectors in the static region are stored in constant memory
8348 * Typestate was removed
8349 * Resolution rewritten to be more reliable
8350 * Support for 'dual-mode' data structures (freezing and thawing)
8353 * Most binary operators can now be overloaded via the traits in
8355 * `std::net::url` for representing URLs
8356 * Sendable hash maps in `core::send_map`
8357 * `core::task' gained a (currently unsafe) task-local storage API
8360 * An efficient new intertask communication primitive called the pipe,
8361 along with a number of higher-level channel types, in `core::pipes`
8362 * `std::arc`, an atomically reference counted, immutable, shared memory
8364 * `std::sync`, various exotic synchronization tools based on arcs and pipes
8365 * Futures are now based on pipes and sendable
8366 * More robust linked task failure
8367 * Improved task builder API
8370 * Improved error reporting
8371 * Preliminary JIT support
8372 * Preliminary work on precise GC
8373 * Extensive architectural improvements to rustc
8374 * Begun a transition away from buggy C++-based reflection (shape) code to
8375 Rust-based (visitor) code
8376 * All hash functions and tables converted to secure, randomized SipHash
8379 Version 0.3 (2012-07-12)
8380 ========================
8382 * ~1900 changes, numerous bugfixes
8384 * New coding conveniences
8385 * Integer-literal suffix inference
8386 * Per-item control over warnings, errors
8387 * #[cfg(windows)] and #[cfg(unix)] attributes
8388 * Documentation comments
8389 * More compact closure syntax
8390 * 'do' expressions for treating higher-order functions as
8392 * *-patterns (wildcard extended to all constructor fields)
8395 * Name resolution pass and exhaustiveness checker rewritten
8396 * Region pointers and borrow checking supersede alias
8398 * Init-ness checking is now provided by a region-based liveness
8399 pass instead of the typestate pass; same for last-use analysis
8400 * Extensive work on region pointers
8402 * Experimental new language features
8403 * Slices and fixed-size, interior-allocated vectors
8404 * #!-comments for lang versioning, shell execution
8405 * Destructors and iface implementation for classes;
8406 type-parameterized classes and class methods
8407 * 'const' type kind for types that can be used to implement
8408 shared-memory concurrency patterns
8412 * Removal of various obsolete features
8413 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
8414 'crust', 'native' (now 'extern'), 'cont' (now 'again')
8416 * Constructs: do-while loops ('do' repurposed), fn binding,
8417 resources (replaced by destructors)
8419 * Compiler reorganization
8420 * Syntax-layer of compiler split into separate crate
8421 * Clang (from LLVM project) integrated into build
8422 * Typechecker split into sub-modules
8425 * New time functions
8426 * Extension methods for many built-in types
8427 * Arc: atomic-refcount read-only / exclusive-use shared cells
8428 * Par: parallel map and search routines
8429 * Extensive work on libuv interface
8430 * Much vector code moved to libraries
8431 * Syntax extensions: #line, #col, #file, #mod, #stringify,
8432 #include, #include_str, #include_bin
8435 * Cargo automatically resolves dependencies
8438 Version 0.2 (2012-03-29)
8439 =========================
8441 * >1500 changes, numerous bugfixes
8443 * New docs and doc tooling
8445 * New port: FreeBSD x86_64
8447 * Compilation model enhancements
8448 * Generics now specialized, multiply instantiated
8449 * Functions now inlined across separate crates
8451 * Scheduling, stack and threading fixes
8452 * Noticeably improved message-passing performance
8453 * Explicit schedulers
8457 * Experimental new language features
8458 * Operator overloading
8462 * Various language extensions
8463 * C-callback function types: 'crust fn ...'
8464 * Infinite-loop construct: 'loop { ... }'
8465 * Shorten 'mutable' to 'mut'
8466 * Required mutable-local qualifier: 'let mut ...'
8467 * Basic glob-exporting: 'export foo::*;'
8468 * Alt now exhaustive, 'alt check' for runtime-checked
8469 * Block-function form of 'for' loop, with 'break' and 'ret'.
8472 * AST quasi-quote syntax extension
8473 * Revived libuv interface
8474 * New modules: core::{future, iter}, std::arena
8475 * Merged per-platform std::{os*, fs*} to core::{libc, os}
8476 * Extensive cleanup, regularization in libstd, libcore
8479 Version 0.1 (2012-01-20)
8480 ===============================
8482 * Most language features work, including:
8483 * Unique pointers, unique closures, move semantics
8484 * Interface-constrained generics
8485 * Static interface dispatch
8487 * Multithread task scheduling
8488 * Typestate predicates
8489 * Failure unwinding, destructors
8490 * Pattern matching and destructuring assignment
8491 * Lightweight block-lambda syntax
8492 * Preliminary macro-by-example
8494 * Compiler works with the following configurations:
8495 * Linux: x86 and x86_64 hosts and targets
8496 * macOS: x86 and x86_64 hosts and targets
8497 * Windows: x86 hosts and targets
8499 * Cross compilation / multi-target configuration supported.
8501 * Preliminary API-documentation and package-management tools included.
8505 * Documentation is incomplete.
8507 * Performance is below intended target.
8509 * Standard library APIs are subject to extensive change, reorganization.
8511 * Language-level versioning is not yet operational - future code will