1 Version 1.58.0 (2022-01-13)
2 ==========================
7 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
8 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
9 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
14 - [Add LLVM CFI support to the Rust compiler][89652]
15 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
16 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
17 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
18 - [Update the minimum external LLVM to 12][90175]
19 - [Add `x86_64-unknown-none` at Tier 3*][89062]
20 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
21 - [Don't abort compilation after giving a lint error][87337]
22 - [Error messages point at the source of trait bound obligations in more places][89580]
24 \* Refer to Rust's [platform support page][platform-support-doc] for more
25 information on Rust's tiered platform support.
30 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
31 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
32 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
33 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
34 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
35 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
40 - [`Metadata::is_symlink`]
41 - [`Path::is_symlink`]
42 - [`{integer}::saturating_div`]
43 - [`Option::unwrap_unchecked`]
44 - [`Result::unwrap_unchecked`]
45 - [`Result::unwrap_err_unchecked`]
46 - [`NonZero{unsigned}::is_power_of_two`]
49 These APIs are now usable in const contexts:
52 - [`Duration::checked_add`]
53 - [`Duration::saturating_add`]
54 - [`Duration::checked_sub`]
55 - [`Duration::saturating_sub`]
56 - [`Duration::checked_mul`]
57 - [`Duration::saturating_mul`]
58 - [`Duration::checked_div`]
59 - [`MaybeUninit::as_ptr`]
60 - [`MaybeUninit::as_mut_ptr`]
61 - [`MaybeUninit::assume_init`]
62 - [`MaybeUninit::assume_init_ref`]
67 - [Add --message-format for install command][cargo/10107]
68 - [Warn when alias shadows external subcommand][cargo/10082]
73 - [Show all Deref implementations recursively in rustdoc][90183]
74 - [Use computed visibility in rustdoc][88447]
79 - [Try all stable method candidates first before trying unstable ones][90329]. This change ensures that adding new nightly-only methods to the Rust standard library will not break code invoking methods of the same name from traits outside the standard library.
80 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
81 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
82 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
83 - [Refactor weak symbols in std::sys::unix][90846]. This optimizes accesses to glibc functions, by avoiding the use of dlopen. This does not increase the [minimum expected version of glibc](https://doc.rust-lang.org/nightly/rustc/platform-support.html). However, software distributions that use symbol versions to detect library dependencies, and which take weak symbols into account in that analysis, may detect rust binaries as requiring newer versions of glibc.
84 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
89 These changes provide no direct user facing benefits, but represent significant
90 improvements to the internals and overall performance of rustc
93 - [Implement coherence checks for negative trait impls][90104]
94 - [Add rustc lint, warning when iterating over hashmaps][89558]
95 - [Optimize live point computation][90491]
96 - [Enable verification for 1/32nd of queries loaded from disk][90361]
97 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
99 [87337]: https://github.com/rust-lang/rust/pull/87337/
100 [87467]: https://github.com/rust-lang/rust/pull/87467/
101 [87704]: https://github.com/rust-lang/rust/pull/87704/
102 [88041]: https://github.com/rust-lang/rust/pull/88041/
103 [88300]: https://github.com/rust-lang/rust/pull/88300/
104 [88447]: https://github.com/rust-lang/rust/pull/88447/
105 [88601]: https://github.com/rust-lang/rust/pull/88601/
106 [88624]: https://github.com/rust-lang/rust/pull/88624/
107 [89062]: https://github.com/rust-lang/rust/pull/89062/
108 [89174]: https://github.com/rust-lang/rust/pull/89174/
109 [89542]: https://github.com/rust-lang/rust/pull/89542/
110 [89551]: https://github.com/rust-lang/rust/pull/89551/
111 [89558]: https://github.com/rust-lang/rust/pull/89558/
112 [89580]: https://github.com/rust-lang/rust/pull/89580/
113 [89652]: https://github.com/rust-lang/rust/pull/89652/
114 [89677]: https://github.com/rust-lang/rust/pull/89677/
115 [89951]: https://github.com/rust-lang/rust/pull/89951/
116 [90041]: https://github.com/rust-lang/rust/pull/90041/
117 [90058]: https://github.com/rust-lang/rust/pull/90058/
118 [90104]: https://github.com/rust-lang/rust/pull/90104/
119 [90117]: https://github.com/rust-lang/rust/pull/90117/
120 [90175]: https://github.com/rust-lang/rust/pull/90175/
121 [90183]: https://github.com/rust-lang/rust/pull/90183/
122 [90297]: https://github.com/rust-lang/rust/pull/90297/
123 [90329]: https://github.com/rust-lang/rust/pull/90329/
124 [90361]: https://github.com/rust-lang/rust/pull/90361/
125 [90417]: https://github.com/rust-lang/rust/pull/90417/
126 [90473]: https://github.com/rust-lang/rust/pull/90473/
127 [90491]: https://github.com/rust-lang/rust/pull/90491/
128 [90733]: https://github.com/rust-lang/rust/pull/90733/
129 [90833]: https://github.com/rust-lang/rust/pull/90833/
130 [90846]: https://github.com/rust-lang/rust/pull/90846/
131 [90896]: https://github.com/rust-lang/rust/pull/90896/
132 [91026]: https://github.com/rust-lang/rust/pull/91026/
133 [91207]: https://github.com/rust-lang/rust/pull/91207/
134 [91255]: https://github.com/rust-lang/rust/pull/91255/
135 [91301]: https://github.com/rust-lang/rust/pull/91301/
136 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
137 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
138 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
139 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
140 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
141 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
142 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
143 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
144 [`NonZero{unsigned}::is_power_of_two`]: https://doc.rust-lang.org/stable/std/num/struct.NonZeroU8.html#method.is_power_of_two
145 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
146 [`unix::process::ExitStatusExt::core_dumped`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.core_dumped
147 [`unix::process::ExitStatusExt::stopped_signal`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.stopped_signal
148 [`unix::process::ExitStatusExt::continued`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.continued
149 [`unix::process::ExitStatusExt::into_raw`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.into_raw
150 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
151 [`Duration::checked_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_add
152 [`Duration::saturating_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_add
153 [`Duration::checked_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_sub
154 [`Duration::saturating_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_sub
155 [`Duration::checked_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_mul
156 [`Duration::saturating_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_mul
157 [`Duration::checked_div`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_div
158 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f64
159 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f32
160 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f64
161 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f32
162 [`Duration::mul_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f64
163 [`Duration::mul_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f32
164 [`Duration::div_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f64
165 [`Duration::div_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f32
166 [`Duration::div_duration_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f64
167 [`Duration::div_duration_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f32
168 [`MaybeUninit::as_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
169 [`MaybeUninit::as_mut_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_mut_ptr
170 [`MaybeUninit::assume_init`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
171 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
173 Version 1.57.0 (2021-12-02)
174 ==========================
179 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
180 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
181 - [Allow panicking in constant evaluation.][89508]
186 - [Create more accurate debuginfo for vtables.][89597]
187 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
188 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
189 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
190 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
192 \* Refer to Rust's [platform support page][platform-support-doc] for more
193 information on Rust's tiered platform support.
198 - [Avoid allocations and copying in `Vec::leak`][89337]
199 - [Add `#[repr(i8)]` to `Ordering`][89507]
200 - [Optimize `File::read_to_end` and `read_to_string`][89582]
201 - [Update to Unicode 14.0][89614]
202 - [Many more functions are marked `#[must_use]`][89692], producing a warning
203 when ignoring their return value. This helps catch mistakes such as expecting
204 a function to mutate a value in place rather than return a new value.
209 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
210 - [`[T; N]::as_slice`][`array::as_slice`]
211 - [`collections::TryReserveError`]
212 - [`HashMap::try_reserve`]
213 - [`HashSet::try_reserve`]
214 - [`String::try_reserve`]
215 - [`String::try_reserve_exact`]
216 - [`Vec::try_reserve`]
217 - [`Vec::try_reserve_exact`]
218 - [`VecDeque::try_reserve`]
219 - [`VecDeque::try_reserve_exact`]
220 - [`Iterator::map_while`]
222 - [`proc_macro::is_available`]
223 - [`Command::get_program`]
224 - [`Command::get_args`]
225 - [`Command::get_envs`]
226 - [`Command::get_current_dir`]
230 These APIs are now usable in const contexts:
232 - [`hint::unreachable_unchecked`]
237 - [Stabilize custom profiles][cargo/9943]
244 These changes provide no direct user facing benefits, but represent significant
245 improvements to the internals and overall performance of rustc
248 - [Added an experimental backend for codegen with `libgccjit`.][87260]
250 [86191]: https://github.com/rust-lang/rust/pull/86191/
251 [87220]: https://github.com/rust-lang/rust/pull/87220/
252 [87260]: https://github.com/rust-lang/rust/pull/87260/
253 [88243]: https://github.com/rust-lang/rust/pull/88243/
254 [88321]: https://github.com/rust-lang/rust/pull/88321/
255 [88529]: https://github.com/rust-lang/rust/pull/88529/
256 [88690]: https://github.com/rust-lang/rust/pull/88690/
257 [88952]: https://github.com/rust-lang/rust/pull/88952/
258 [89337]: https://github.com/rust-lang/rust/pull/89337/
259 [89507]: https://github.com/rust-lang/rust/pull/89507/
260 [89508]: https://github.com/rust-lang/rust/pull/89508/
261 [89582]: https://github.com/rust-lang/rust/pull/89582/
262 [89597]: https://github.com/rust-lang/rust/pull/89597/
263 [89614]: https://github.com/rust-lang/rust/pull/89614/
264 [89692]: https://github.com/rust-lang/rust/issues/89692/
265 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
266 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
267 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
268 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
269 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
270 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
271 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
272 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
273 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
274 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
275 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
276 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
277 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
278 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
279 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
280 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
281 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
282 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
283 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
284 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
285 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
287 Version 1.56.1 (2021-11-01)
288 ===========================
290 - New lints to detect the presence of bidirectional-override Unicode
291 codepoints in the compiled source code ([CVE-2021-42574])
293 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
295 Version 1.56.0 (2021-10-21)
296 ========================
301 - [The 2021 Edition is now stable.][rust#88100]
302 See [the edition guide][rust-2021-edition-guide] for more details.
303 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
304 - [Union field access is permitted in `const fn`.][rust#85769]
306 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
311 - [Upgrade to LLVM 13.][rust#87570]
312 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
313 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
314 - [Warnings can be forced on with `--force-warn`.][rust#87472]
315 This feature is primarily intended for usage by `cargo fix`, rather than end users.
316 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
317 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
318 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
320 \* Refer to Rust's [platform support page][platform-support-doc] for more
321 information on Rust's tiered platform support.
326 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
327 The Windows console still requires valid Unicode, but this change allows
328 splitting a UTF-8 character across multiple write calls. This allows, for
329 instance, programs that just read and write data buffers (e.g. copying a file
330 to stdout) without regard for Unicode or character boundaries.
331 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
332 For this use case, atomics scale much better under contention.
333 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
334 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
335 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
336 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
337 - [Treat invalid environment variable names as non-existent.][rust#86183]
338 Previously, the environment functions would panic if given a variable name
339 with an internal null character or equal sign (`=`). Now, these functions will
340 just treat such names as non-existent variables, since the OS cannot represent
341 the existence of a variable with such a name.
346 - [`std::os::unix::fs::chroot`]
347 - [`UnsafeCell::raw_get`]
348 - [`BufWriter::into_parts`]
349 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
350 These APIs were previously stable in `std`, but are now also available in `core`.
352 - [`String::shrink_to`]
353 - [`OsString::shrink_to`]
354 - [`PathBuf::shrink_to`]
355 - [`BinaryHeap::shrink_to`]
356 - [`VecDeque::shrink_to`]
357 - [`HashMap::shrink_to`]
358 - [`HashSet::shrink_to`]
360 These APIs are now usable in const contexts:
362 - [`std::mem::transmute`]
363 - [`[T]::first`][`slice::first`]
364 - [`[T]::split_first`][`slice::split_first`]
365 - [`[T]::last`][`slice::last`]
366 - [`[T]::split_last`][`slice::split_last`]
371 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
372 This has no effect at present on dependency version selection.
373 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
374 that support Rust code to include a crate's specified minimum version in the test matrix for that
380 - [Update to new argument parsing rules on Windows.][rust#87580]
381 This adjusts Rust's standard library to match the behavior of the standard
382 libraries for C/C++. The rules have changed slightly over time, and this PR
383 brings us to the latest set of rules (changed in 2008).
384 - [Disallow the aapcs calling convention on aarch64][rust#88399]
385 This was already not supported by LLVM; this change surfaces this lack of
386 support with a better error message.
387 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
388 - [Warn when an escaped newline skips multiple lines.][rust#87671]
389 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
390 may return different values on glibc <= 2.24.][rust#81825]
391 Rust now invokes the `clone3` system call directly, when available, to use new functionality
392 available via that system call. Older versions of glibc cache the result of `getpid`, and only
393 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
394 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
398 These changes provide no direct user facing benefits, but represent significant
399 improvements to the internals and overall performance of rustc
402 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
403 This improves the performance of most Rust builds.
404 - [Unify representation of macros in internal data structures.][rust#88019]
405 This change fixes a host of bugs with the handling of macros by the compiler,
408 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
409 [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
410 [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
411 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
412 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
413 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
414 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
415 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
416 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
417 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
418 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
419 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
420 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
421 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
422 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
423 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
424 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
425 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
426 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
427 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
428 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
429 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
430 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
431 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
432 [rust#86860]: https://github.com/rust-lang/rust/pull/86860
433 [rust#84039]: https://github.com/rust-lang/rust/pull/84039
434 [rust#86492]: https://github.com/rust-lang/rust/pull/86492
435 [rust#88363]: https://github.com/rust-lang/rust/pull/88363
436 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
437 [rust#87832]: https://github.com/rust-lang/rust/pull/87832
438 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
439 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
440 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
441 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
442 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
443 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
444 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
445 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
446 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
447 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
448 [rust#88177]: https://github.com/rust-lang/rust/pull/88177
449 [rust#88548]: https://github.com/rust-lang/rust/pull/88548
450 [rust#88551]: https://github.com/rust-lang/rust/pull/88551
451 [rust#88299]: https://github.com/rust-lang/rust/pull/88299
452 [rust#88220]: https://github.com/rust-lang/rust/pull/88220
453 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
454 [rust#86879]: https://github.com/rust-lang/rust/pull/86879
455 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
456 [rust#84662]: https://github.com/rust-lang/rust/pull/84662
457 [rust#86593]: https://github.com/rust-lang/rust/pull/86593
458 [rust#81050]: https://github.com/rust-lang/rust/pull/81050
459 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
460 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
461 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
462 [rust#88490]: https://github.com/rust-lang/rust/pull/88490
463 [rust#88269]: https://github.com/rust-lang/rust/pull/88269
464 [rust#84176]: https://github.com/rust-lang/rust/pull/84176
465 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
466 [rust#88227]: https://github.com/rust-lang/rust/pull/88227
467 [rust#88200]: https://github.com/rust-lang/rust/pull/88200
468 [rust#82776]: https://github.com/rust-lang/rust/pull/82776
469 [rust#88077]: https://github.com/rust-lang/rust/pull/88077
470 [rust#87728]: https://github.com/rust-lang/rust/pull/87728
471 [rust#87050]: https://github.com/rust-lang/rust/pull/87050
472 [rust#87619]: https://github.com/rust-lang/rust/pull/87619
473 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
474 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
475 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
477 Version 1.55.0 (2021-09-09)
478 ============================
482 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
483 will end at the maximum value of the integer.][83918]
484 - [You can now explicitly import the prelude of different editions
485 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
489 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
491 \* Refer to Rust's [platform support page][platform-support-doc] for more
492 information on Rust's tiered platform support.
497 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
498 These improvements should in general provide faster string parsing of floats,
499 no longer reject certain valid floating point values, and reduce
500 the produced code size for non-stripped artifacts.
501 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
508 - [`IntoInnerError::into_error`]
509 - [`IntoInnerError::into_parts`]
510 - [`MaybeUninit::assume_init_mut`]
511 - [`MaybeUninit::assume_init_ref`]
512 - [`MaybeUninit::write`]
514 - [`ops::ControlFlow`]
516 - [`x86::_bittestandcomplement`]
517 - [`x86::_bittestandreset`]
518 - [`x86::_bittestandset`]
519 - [`x86_64::_bittest64`]
520 - [`x86_64::_bittestandcomplement64`]
521 - [`x86_64::_bittestandreset64`]
522 - [`x86_64::_bittestandset64`]
524 The following previously stable functions are now `const`.
526 - [`str::from_utf8_unchecked`]
531 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
532 rustc in parallel such as when using `cargo test`.][cargo/9675]
533 - [The package definition in `cargo metadata` now includes the `"default_run"`
534 field from the manifest.][cargo/9550]
535 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
536 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
537 of packages.][cargo/9663]
541 - [Added "Go to item on exact match" search option.][85876]
542 - [The "Implementors" section on traits no longer shows redundant
543 method definitions.][85970]
544 - [Trait implementations are toggled open by default.][86260] This should make the
545 implementations more searchable by tools like `CTRL+F` in your browser.
546 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
547 through type aliases.][86334]
548 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
549 "Trait Implementations" section.][86513]
554 - [std functions that return an `io::Error` will no longer use the
555 `ErrorKind::Other` variant.][85746] This is to better reflect that these
556 kinds of errors could be categorised [into newer more specific `ErrorKind`
557 variants][79965], and that they do not represent a user error.
558 - [Using environment variable names with `process::Command` on Windows now
559 behaves as expected.][85270] Previously using envionment variables with
560 `Command` would cause them to be ASCII-uppercased.
561 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
562 with `rustdoc::`][86849]
563 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
564 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
565 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
568 [86849]: https://github.com/rust-lang/rust/pull/86849
569 [86513]: https://github.com/rust-lang/rust/pull/86513
570 [86334]: https://github.com/rust-lang/rust/pull/86334
571 [86260]: https://github.com/rust-lang/rust/pull/86260
572 [85970]: https://github.com/rust-lang/rust/pull/85970
573 [85876]: https://github.com/rust-lang/rust/pull/85876
574 [83572]: https://github.com/rust-lang/rust/pull/83572
575 [86294]: https://github.com/rust-lang/rust/pull/86294
576 [86858]: https://github.com/rust-lang/rust/pull/86858
577 [86761]: https://github.com/rust-lang/rust/pull/86761
578 [85769]: https://github.com/rust-lang/rust/pull/85769
579 [85746]: https://github.com/rust-lang/rust/pull/85746
580 [85305]: https://github.com/rust-lang/rust/pull/85305
581 [85270]: https://github.com/rust-lang/rust/pull/85270
582 [84111]: https://github.com/rust-lang/rust/pull/84111
583 [83918]: https://github.com/rust-lang/rust/pull/83918
584 [79965]: https://github.com/rust-lang/rust/pull/79965
585 [87370]: https://github.com/rust-lang/rust/pull/87370
586 [87298]: https://github.com/rust-lang/rust/pull/87298
587 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
588 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
589 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
590 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
591 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
592 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
593 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
594 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
595 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
596 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
597 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
598 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
599 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
600 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
601 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
602 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
603 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
604 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
605 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
606 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
607 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
608 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
609 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
610 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
613 Version 1.54.0 (2021-07-29)
614 ============================
617 -----------------------
619 - [You can now use macros for values in some built-in attributes.][83366]
620 This primarily allows you to call macros within the `#[doc]` attribute. For
621 example, to include external documentation in your crate, you can now write
624 #![doc = include_str!("README.md")]
627 - [You can now cast between unsized slice types (and types which contain
628 unsized slices) in `const fn`.][85078]
629 - [You can now use multiple generic lifetimes with `impl Trait` where the
630 lifetimes don't explicitly outlive another.][84701] In code this means
631 that you can now have `impl Trait<'a, 'b>` where as before you could
632 only have `impl Trait<'a, 'b> where 'b: 'a`.
635 -----------------------
637 - [Rustc will now search for custom JSON targets in
638 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
639 directory.][83800] You can find your sysroot directory by running
640 `rustc --print sysroot`.
641 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
642 - [You can now use `#[target_feature]` on safe functions when targeting
643 WebAssembly platforms.][84988]
644 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
645 - [Added tier 3\* support for `bpfel-unknown-none`
646 and `bpfeb-unknown-none`.][79608]
647 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
649 \* Refer to Rust's [platform support page][platform-support-doc] for more
650 information on Rust's tiered platform support.
653 -----------------------
655 - [`panic::panic_any` will now `#[track_caller]`.][85745]
656 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
657 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
658 - [The implementations of vendor intrinsics in core::arch have been
659 significantly refactored.][83278] The main user-visible changes are
660 a 50% reduction in the size of libcore.rlib and stricter validation
661 of constant operands passed to intrinsics. The latter is technically
662 a breaking change, but allows Rust to more closely match the C vendor
668 - [`BTreeMap::into_keys`]
669 - [`BTreeMap::into_values`]
670 - [`HashMap::into_keys`]
671 - [`HashMap::into_values`]
673 - [`VecDeque::binary_search`]
674 - [`VecDeque::binary_search_by`]
675 - [`VecDeque::binary_search_by_key`]
676 - [`VecDeque::partition_point`]
681 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
682 the dependency graph.][cargo/9520]
683 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
684 in the tree ][cargo/9499]
685 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
686 macro dependencies.][cargo/9488]
687 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
688 This variable points to a directory that integration tests and benches
689 can use as a "scratchpad" for testing filesystem operations.
693 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
694 - [Previously unsound code is no longer permitted where different constructors in branches
695 could require different lifetimes.][85574]
696 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
697 than before and may reject some previously accepted code.
698 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
699 when compiled with `codegen-units = 1`.][86063]
701 [85574]: https://github.com/rust-lang/rust/issues/85574
702 [86831]: https://github.com/rust-lang/rust/issues/86831
703 [86063]: https://github.com/rust-lang/rust/issues/86063
704 [86831]: https://github.com/rust-lang/rust/issues/86831
705 [79608]: https://github.com/rust-lang/rust/pull/79608
706 [84988]: https://github.com/rust-lang/rust/pull/84988
707 [84701]: https://github.com/rust-lang/rust/pull/84701
708 [84072]: https://github.com/rust-lang/rust/pull/84072
709 [85745]: https://github.com/rust-lang/rust/pull/85745
710 [84744]: https://github.com/rust-lang/rust/pull/84744
711 [85078]: https://github.com/rust-lang/rust/pull/85078
712 [84717]: https://github.com/rust-lang/rust/pull/84717
713 [83800]: https://github.com/rust-lang/rust/pull/83800
714 [83366]: https://github.com/rust-lang/rust/pull/83366
715 [83278]: https://github.com/rust-lang/rust/pull/83278
716 [85292]: https://github.com/rust-lang/rust/pull/85292
717 [82834]: https://github.com/rust-lang/rust/pull/82834
718 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
719 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
720 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
721 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
722 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
723 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
724 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
725 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
726 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
727 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
728 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
730 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
732 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
734 Version 1.53.0 (2021-06-17)
735 ============================
738 -----------------------
739 - [You can now use unicode for identifiers.][83799] This allows multilingual
740 identifiers but still doesn't allow glyphs that are not considered characters
741 such as `◆` or `🦀`. More specifically you can now use any identifier that
742 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
743 is the same standard as languages like Python, however Rust uses NFC
744 normalization which may be different from other languages.
745 - [You can now specify "or patterns" inside pattern matches.][79278]
746 Previously you could only use `|` (OR) on complete patterns. E.g.
750 matches!(x, Some(1) | Some(2));
752 matches!(x, Some(1 | 2));
754 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
755 has the same semantics as the `:pat` matcher. This is to allow `:pat`
756 to change semantics to being a pattern fragment in a future edition.
759 -----------------------
760 - [Updated the minimum external LLVM version to LLVM 10.][83387]
761 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
762 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
764 \* Refer to Rust's [platform support page][platform-support-doc] for more
765 information on Rust's tiered platform support.
768 -----------------------
769 - [Abort messages will now forward to `android_set_abort_message` on
770 Android platforms when available.][81469]
771 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
772 - [Arrays of any length now implement `IntoIterator`.][84147]
773 Currently calling `.into_iter()` as a method on an array will
774 return `impl Iterator<Item=&T>`, but this may change in a
775 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
776 directly on arrays will provide `impl Iterator<Item=T>` as expected.
777 - [`leading_zeros`, and `trailing_zeros` are now available on all
778 `NonZero` integer types.][84082]
779 - [`{f32, f64}::from_str` now parse and print special values
780 (`NaN`, `-0`) according to IEEE 754.][78618]
781 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
782 - [Add the `BITS` associated constant to all numeric types.][82565]
786 - [`AtomicBool::fetch_update`]
787 - [`AtomicPtr::fetch_update`]
788 - [`BTreeMap::retain`]
789 - [`BTreeSet::retain`]
790 - [`BufReader::seek_relative`]
791 - [`DebugStruct::non_exhaustive`]
794 - [`Duration::is_zero`]
795 - [`Duration::saturating_add`]
796 - [`Duration::saturating_mul`]
797 - [`Duration::saturating_sub`]
798 - [`ErrorKind::Unsupported`]
800 - [`Ordering::is_eq`]
801 - [`Ordering::is_ge`]
802 - [`Ordering::is_gt`]
803 - [`Ordering::is_le`]
804 - [`Ordering::is_lt`]
805 - [`Ordering::is_ne`]
806 - [`OsStr::is_ascii`]
807 - [`OsStr::make_ascii_lowercase`]
808 - [`OsStr::make_ascii_uppercase`]
809 - [`OsStr::to_ascii_lowercase`]
810 - [`OsStr::to_ascii_uppercase`]
811 - [`Peekable::peek_mut`]
812 - [`Rc::decrement_strong_count`]
813 - [`Rc::increment_strong_count`]
814 - [`Vec::extend_from_within`]
815 - [`array::from_mut`]
816 - [`array::from_ref`]
817 - [`cmp::max_by_key`]
819 - [`cmp::min_by_key`]
821 - [`f32::is_subnormal`]
822 - [`f64::is_subnormal`]
825 -----------------------
826 - [Cargo now supports git repositories where the default `HEAD` branch is not
827 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
828 which can handle default branches correctly.
829 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
830 - [The `authors` field is no longer included in `Cargo.toml` for new
831 projects.][cargo/9282]
834 -----------------------
835 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
836 without hyperlinks.][81764]
840 - [Implement token-based handling of attributes during expansion][82608]
841 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
842 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
843 to confusion and potential security vulnerabilities and [is no
844 longer recommended][ietf6943].
845 - [The added `BITS` constant may conflict with external definitions.][85667]
846 In particular, this was known to be a problem in the `lexical-core` crate,
847 but they have published fixes for semantic versions 0.4 through 0.7. To
848 update this dependency alone, use `cargo update -p lexical-core`.
849 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
853 These changes provide no direct user facing benefits, but represent significant
854 improvements to the internals and overall performance of rustc and
857 - [Rework the `std::sys::windows::alloc` implementation.][83065]
858 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
859 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
860 - [Rework rustdoc const type][82873]
862 [85667]: https://github.com/rust-lang/rust/pull/85667
863 [83386]: https://github.com/rust-lang/rust/pull/83386
864 [82771]: https://github.com/rust-lang/rust/pull/82771
865 [84147]: https://github.com/rust-lang/rust/pull/84147
866 [84082]: https://github.com/rust-lang/rust/pull/84082
867 [83799]: https://github.com/rust-lang/rust/pull/83799
868 [83681]: https://github.com/rust-lang/rust/pull/83681
869 [83652]: https://github.com/rust-lang/rust/pull/83652
870 [83387]: https://github.com/rust-lang/rust/pull/83387
871 [82873]: https://github.com/rust-lang/rust/pull/82873
872 [82864]: https://github.com/rust-lang/rust/pull/82864
873 [82608]: https://github.com/rust-lang/rust/pull/82608
874 [82565]: https://github.com/rust-lang/rust/pull/82565
875 [80525]: https://github.com/rust-lang/rust/pull/80525
876 [79278]: https://github.com/rust-lang/rust/pull/79278
877 [78618]: https://github.com/rust-lang/rust/pull/78618
878 [77704]: https://github.com/rust-lang/rust/pull/77704
879 [83941]: https://github.com/rust-lang/rust/pull/83941
880 [83065]: https://github.com/rust-lang/rust/pull/83065
881 [81764]: https://github.com/rust-lang/rust/pull/81764
882 [81469]: https://github.com/rust-lang/rust/pull/81469
883 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
884 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
885 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
886 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
887 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
888 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
889 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
890 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
891 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
892 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
893 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
894 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
895 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
896 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
897 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
898 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
899 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
900 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
901 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
902 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
903 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
904 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
905 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
906 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
907 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
908 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
909 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
910 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
911 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
912 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
913 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
914 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
915 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
916 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
917 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
918 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
919 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
920 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
921 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
922 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
923 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
924 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
927 Version 1.52.1 (2021-05-10)
928 ============================
930 This release disables incremental compilation, unless the user has explicitly
931 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
933 This is due to the widespread, and frequently occuring, breakage encountered by
934 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
935 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
936 newly added incremental verification are still present in past stable versions,
937 and are not yet fixed on any channel. These bugs can lead to miscompilation of
940 These problems only affect incremental builds, so release builds with Cargo
941 should not be affected unless the user has explicitly opted into incremental.
942 Debug and check builds are affected.
944 See [84970] for more details.
946 [84970]: https://github.com/rust-lang/rust/issues/84970
948 Version 1.52.0 (2021-05-06)
949 ============================
953 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
954 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
955 is allowed by default, and may become a warning or hard error in a
957 - [You can now cast mutable references to arrays to a pointer of the same type as
962 - [Upgraded the default LLVM to LLVM 12.][81451]
964 Added tier 3\* support for the following targets.
966 - [`s390x-unknown-linux-musl`][82166]
967 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
968 - [`powerpc-unknown-openbsd`][82733]
970 \* Refer to Rust's [platform support page][platform-support-doc] for more
971 information on Rust's tiered platform support.
975 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
976 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
977 - [`Arc<impl Error>` now implements `error::Error`.][80553]
978 - [All integer division and remainder operations are now `const`.][80962]
982 - [`Arguments::as_str`]
984 - [`char::REPLACEMENT_CHARACTER`]
985 - [`char::UNICODE_VERSION`]
986 - [`char::decode_utf16`]
987 - [`char::from_digit`]
988 - [`char::from_u32_unchecked`]
990 - [`slice::partition_point`]
991 - [`str::rsplit_once`]
992 - [`str::split_once`]
994 The following previously stable APIs are now `const`.
997 - [`char::len_utf16`]
998 - [`char::to_ascii_uppercase`]
999 - [`char::to_ascii_lowercase`]
1000 - [`char::eq_ignore_ascii_case`]
1001 - [`u8::to_ascii_uppercase`]
1002 - [`u8::to_ascii_lowercase`]
1003 - [`u8::eq_ignore_ascii_case`]
1007 - [Rustdoc lints are now treated as a tool lint, meaning that
1008 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1009 Using the old style is still allowed, and will become a warning in
1011 - [Rustdoc now supports argument files.][82261]
1012 - [Rustdoc now generates smart punctuation for documentation.][79423]
1013 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1021 - [You can now pass multiple filters to tests.][81356] E.g.
1022 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1023 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1024 allowing you to see `std` symbols when debugging.][82218]
1028 These changes provide no direct user facing benefits, but represent significant
1029 improvements to the internals and overall performance of rustc and
1032 - [Check the result cache before the DepGraph when ensuring queries][81855]
1033 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1034 - [Only store a LocalDefId in some HIR nodes][81611]
1035 - [Store HIR attributes in a side table][79519]
1039 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1040 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1041 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1042 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1043 languages in code blocks.][78429]
1044 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1045 - [Changes in how proc macros handle whitespace may lead to panics when used
1046 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1047 - [Turn `#[derive]` into a regular macro attribute][79078]
1049 [84136]: https://github.com/rust-lang/rust/issues/84136
1050 [80763]: https://github.com/rust-lang/rust/pull/80763
1051 [82166]: https://github.com/rust-lang/rust/pull/82166
1052 [82121]: https://github.com/rust-lang/rust/pull/82121
1053 [81879]: https://github.com/rust-lang/rust/pull/81879
1054 [82261]: https://github.com/rust-lang/rust/pull/82261
1055 [82218]: https://github.com/rust-lang/rust/pull/82218
1056 [82216]: https://github.com/rust-lang/rust/pull/82216
1057 [82202]: https://github.com/rust-lang/rust/pull/82202
1058 [81855]: https://github.com/rust-lang/rust/pull/81855
1059 [81766]: https://github.com/rust-lang/rust/pull/81766
1060 [81744]: https://github.com/rust-lang/rust/pull/81744
1061 [81611]: https://github.com/rust-lang/rust/pull/81611
1062 [81479]: https://github.com/rust-lang/rust/pull/81479
1063 [81451]: https://github.com/rust-lang/rust/pull/81451
1064 [81356]: https://github.com/rust-lang/rust/pull/81356
1065 [80962]: https://github.com/rust-lang/rust/pull/80962
1066 [80553]: https://github.com/rust-lang/rust/pull/80553
1067 [80527]: https://github.com/rust-lang/rust/pull/80527
1068 [79519]: https://github.com/rust-lang/rust/pull/79519
1069 [79423]: https://github.com/rust-lang/rust/pull/79423
1070 [79208]: https://github.com/rust-lang/rust/pull/79208
1071 [78429]: https://github.com/rust-lang/rust/pull/78429
1072 [82733]: https://github.com/rust-lang/rust/pull/82733
1073 [82594]: https://github.com/rust-lang/rust/pull/82594
1074 [79078]: https://github.com/rust-lang/rust/pull/79078
1075 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1076 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1077 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1078 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1079 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1080 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1081 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1082 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1083 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1084 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1085 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1086 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1087 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1088 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1089 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1090 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1091 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1092 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1093 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1094 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1095 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1096 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1098 Version 1.51.0 (2021-03-25)
1099 ============================
1103 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1104 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1105 E.g. you can now write the following. Note: Only values of primitive integers,
1106 `bool`, or `char` types are currently permitted.
1108 struct GenericArray<T, const LENGTH: usize> {
1112 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1113 const fn last(&self) -> Option<&T> {
1117 Some(&self.inner[LENGTH - 1])
1127 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1128 This option controls whether debug information is split across multiple files
1129 or packed into a single file. **Note** This option is unstable on other platforms.
1130 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1131 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1132 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1133 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1135 \* Refer to Rust's [platform support page][platform-support-doc] for more
1136 information on Rust's tiered platform support.
1141 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1142 - [`str` now implements `AsMut<str>`.][80279]
1143 - [`u64` and `u128` now implement `From<char>`.][79502]
1144 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1145 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1146 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1147 - [`io::Empty` now implements `io::Seek`.][78044]
1148 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1149 `T: ?Sized` types.][80764]
1150 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1156 - [`Arc::decrement_strong_count`]
1157 - [`Arc::increment_strong_count`]
1158 - [`Once::call_once_force`]
1159 - [`Peekable::next_if_eq`]
1160 - [`Peekable::next_if`]
1161 - [`Seek::stream_position`]
1162 - [`array::IntoIter`]
1163 - [`panic::panic_any`]
1165 - [`ptr::addr_of_mut!`]
1166 - [`slice::fill_with`]
1167 - [`slice::split_inclusive_mut`]
1168 - [`slice::split_inclusive`]
1169 - [`slice::strip_prefix`]
1170 - [`slice::strip_suffix`]
1171 - [`str::split_inclusive`]
1172 - [`sync::OnceState`]
1174 - [`VecDeque::range`]
1175 - [`VecDeque::range_mut`]
1179 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1180 codegen option.][cargo/9112]
1181 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1182 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1183 to avoid unifying features of dependencies where that unification could be unwanted.
1184 Such as using the same dependency with a `std` feature in a build scripts and
1185 proc-macros, while using the `no-std` feature in the final binary. See the
1186 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1191 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1192 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1193 documentation.][79642]
1195 Various improvements to intra-doc links:
1197 - [You can link to non-path primitives such as `slice`.][80181]
1198 - [You can link to associated items.][74489]
1199 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1203 - [You can now pass `--include-ignored` to tests (e.g. with
1204 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1209 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1210 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1212 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1213 for the distributed artifacts.][81521]
1214 - `armv5te-unknown-linux-gnueabi`
1215 - `sparc64-unknown-linux-gnu`
1216 - `thumbv7neon-unknown-linux-gnueabihf`
1217 - `armv7-unknown-linux-gnueabi`
1218 - `x86_64-unknown-linux-gnux32`
1219 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1224 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1226 [79135]: https://github.com/rust-lang/rust/pull/79135
1227 [74489]: https://github.com/rust-lang/rust/pull/74489
1228 [76934]: https://github.com/rust-lang/rust/pull/76934
1229 [79570]: https://github.com/rust-lang/rust/pull/79570
1230 [80181]: https://github.com/rust-lang/rust/pull/80181
1231 [79642]: https://github.com/rust-lang/rust/pull/79642
1232 [80945]: https://github.com/rust-lang/rust/pull/80945
1233 [80279]: https://github.com/rust-lang/rust/pull/80279
1234 [80053]: https://github.com/rust-lang/rust/pull/80053
1235 [79502]: https://github.com/rust-lang/rust/pull/79502
1236 [75180]: https://github.com/rust-lang/rust/pull/75180
1237 [79135]: https://github.com/rust-lang/rust/pull/79135
1238 [81521]: https://github.com/rust-lang/rust/pull/81521
1239 [80968]: https://github.com/rust-lang/rust/pull/80968
1240 [80959]: https://github.com/rust-lang/rust/pull/80959
1241 [80718]: https://github.com/rust-lang/rust/pull/80718
1242 [80653]: https://github.com/rust-lang/rust/pull/80653
1243 [80579]: https://github.com/rust-lang/rust/pull/80579
1244 [79998]: https://github.com/rust-lang/rust/pull/79998
1245 [78044]: https://github.com/rust-lang/rust/pull/78044
1246 [81455]: https://github.com/rust-lang/rust/pull/81455
1247 [80764]: https://github.com/rust-lang/rust/pull/80764
1248 [80749]: https://github.com/rust-lang/rust/pull/80749
1249 [80662]: https://github.com/rust-lang/rust/pull/80662
1250 [79134]: https://github.com/rust-lang/rust/pull/79134
1251 [80966]: https://github.com/rust-lang/rust/pull/80966
1252 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1253 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1254 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1255 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1256 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1257 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1258 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1259 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1260 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1261 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1262 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1263 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1264 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1265 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1266 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1267 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1268 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1269 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1270 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1271 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1272 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1273 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1274 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1276 Version 1.50.0 (2021-02-11)
1277 ============================
1280 -----------------------
1281 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1282 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1283 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1286 -----------------------
1287 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1288 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1289 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1290 - [Dropped support for all cloudabi targets.][78439]
1292 \* Refer to Rust's [platform support page][platform-support-doc] for more
1293 information on Rust's tiered platform support.
1296 -----------------------
1298 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1299 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1300 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1301 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1302 up the same amount of space as `File`.
1308 - [`btree_map::Entry::or_insert_with_key`]
1311 - [`hash_map::Entry::or_insert_with_key`]
1315 - [`UnsafeCell::get_mut`]
1317 The following previously stable methods are now `const`.
1319 - [`IpAddr::is_ipv4`]
1320 - [`IpAddr::is_ipv6`]
1321 - [`IpAddr::is_unspecified`]
1322 - [`IpAddr::is_loopback`]
1323 - [`IpAddr::is_multicast`]
1324 - [`Ipv4Addr::octets`]
1325 - [`Ipv4Addr::is_loopback`]
1326 - [`Ipv4Addr::is_private`]
1327 - [`Ipv4Addr::is_link_local`]
1328 - [`Ipv4Addr::is_multicast`]
1329 - [`Ipv4Addr::is_broadcast`]
1330 - [`Ipv4Addr::is_documentation`]
1331 - [`Ipv4Addr::to_ipv6_compatible`]
1332 - [`Ipv4Addr::to_ipv6_mapped`]
1333 - [`Ipv6Addr::segments`]
1334 - [`Ipv6Addr::is_unspecified`]
1335 - [`Ipv6Addr::is_loopback`]
1336 - [`Ipv6Addr::is_multicast`]
1337 - [`Ipv6Addr::to_ipv4`]
1340 - [`Layout::from_size_align`]
1341 - `pow` for all integer types.
1342 - `checked_pow` for all integer types.
1343 - `saturating_pow` for all integer types.
1344 - `wrapping_pow` for all integer types.
1345 - `next_power_of_two` for all unsigned integer types.
1346 - `checked_next_power_of_two` for all unsigned integer types.
1349 -----------------------
1351 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1352 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1353 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1354 contents of that directory for changes.][cargo/8973]
1355 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1360 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1361 - [Running tests will now print the total time taken to execute.][75752]
1366 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1367 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1368 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1369 unhygenic `macro_rules!` macros.][79472]
1370 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1371 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1372 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1373 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1374 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1375 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1377 [74989]: https://github.com/rust-lang/rust/pull/74989
1378 [79261]: https://github.com/rust-lang/rust/pull/79261
1379 [79896]: https://github.com/rust-lang/rust/pull/79896
1380 [79484]: https://github.com/rust-lang/rust/pull/79484
1381 [79472]: https://github.com/rust-lang/rust/pull/79472
1382 [79270]: https://github.com/rust-lang/rust/pull/79270
1383 [79003]: https://github.com/rust-lang/rust/pull/79003
1384 [78864]: https://github.com/rust-lang/rust/pull/78864
1385 [78636]: https://github.com/rust-lang/rust/pull/78636
1386 [78439]: https://github.com/rust-lang/rust/pull/78439
1387 [78343]: https://github.com/rust-lang/rust/pull/78343
1388 [78296]: https://github.com/rust-lang/rust/pull/78296
1389 [78068]: https://github.com/rust-lang/rust/pull/78068
1390 [75752]: https://github.com/rust-lang/rust/pull/75752
1391 [74699]: https://github.com/rust-lang/rust/pull/74699
1392 [78142]: https://github.com/rust-lang/rust/pull/78142
1393 [77484]: https://github.com/rust-lang/rust/pull/77484
1394 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1395 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1396 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1397 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1398 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1399 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1400 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1401 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1402 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1403 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1404 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1405 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1406 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1407 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1408 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1409 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1410 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1411 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1412 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1413 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1414 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1415 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1416 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1417 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1418 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1419 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1420 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1421 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1422 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1423 [`btree_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/btree_map/enum.Entry.html#method.or_insert_with_key
1424 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1425 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1426 [`hash_map::Entry::or_insert_with_key`]: https://doc.rust-lang.org/stable/std/collections/hash_map/enum.Entry.html#method.or_insert_with_key
1427 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1430 Version 1.49.0 (2020-12-31)
1431 ============================
1434 -----------------------
1436 - [Unions can now implement `Drop`, and you can now have a field in a union
1437 with `ManuallyDrop<T>`.][77547]
1438 - [You can now cast uninhabited enums to integers.][76199]
1439 - [You can now bind by reference and by move in patterns.][76119] This
1440 allows you to selectively borrow individual components of a type. E.g.
1448 let person = Person {
1449 name: String::from("Alice"),
1453 // `name` is moved out of person, but `age` is referenced.
1454 let Person { name, ref age } = person;
1455 println!("{} {}", name, age);
1459 -----------------------
1461 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1462 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1463 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1464 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1465 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1466 - [Output from threads spawned in tests is now captured.][78227]
1467 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1469 \* Refer to Rust's [platform support page][platform-support-doc] for more
1470 information on Rust's tiered platform support.
1473 -----------------------
1475 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1476 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1481 - [`slice::select_nth_unstable`]
1482 - [`slice::select_nth_unstable_by`]
1483 - [`slice::select_nth_unstable_by_key`]
1485 The following previously stable methods are now `const`.
1487 - [`Poll::is_ready`]
1488 - [`Poll::is_pending`]
1491 -----------------------
1492 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1493 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1494 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1495 variable will be set if the crate being built is one the user selected to build, either
1496 with `-p` or through defaults.
1497 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1503 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1504 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1505 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1506 Previously such invalid or unused attributes could be ignored.
1507 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1508 read [this post about the changes][rustdoc-ws-post] for more details.
1509 - [Trait bounds are no longer inferred for associated types.][79904]
1513 These changes provide no direct user facing benefits, but represent significant
1514 improvements to the internals and overall performance of rustc and
1517 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1518 Local Storage model.][78201]
1519 - [Calculate visibilities once in resolve.][78077]
1520 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1521 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1524 [75991]: https://github.com/rust-lang/rust/pull/75991
1525 [78951]: https://github.com/rust-lang/rust/pull/78951
1526 [78848]: https://github.com/rust-lang/rust/pull/78848
1527 [78746]: https://github.com/rust-lang/rust/pull/78746
1528 [78376]: https://github.com/rust-lang/rust/pull/78376
1529 [78228]: https://github.com/rust-lang/rust/pull/78228
1530 [78227]: https://github.com/rust-lang/rust/pull/78227
1531 [78201]: https://github.com/rust-lang/rust/pull/78201
1532 [78109]: https://github.com/rust-lang/rust/pull/78109
1533 [78077]: https://github.com/rust-lang/rust/pull/78077
1534 [77997]: https://github.com/rust-lang/rust/pull/77997
1535 [77703]: https://github.com/rust-lang/rust/pull/77703
1536 [77547]: https://github.com/rust-lang/rust/pull/77547
1537 [77015]: https://github.com/rust-lang/rust/pull/77015
1538 [76199]: https://github.com/rust-lang/rust/pull/76199
1539 [76119]: https://github.com/rust-lang/rust/pull/76119
1540 [75914]: https://github.com/rust-lang/rust/pull/75914
1541 [79004]: https://github.com/rust-lang/rust/pull/79004
1542 [78676]: https://github.com/rust-lang/rust/pull/78676
1543 [79904]: https://github.com/rust-lang/rust/issues/79904
1544 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1545 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1546 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1547 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1548 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1549 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1550 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1551 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1552 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1553 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1554 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1556 Version 1.48.0 (2020-11-19)
1557 ==========================
1562 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1563 is still rejected *semantically*, but can now be parsed by procedural macros.
1567 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1568 `rustc` whether to link its own C runtime and libraries or to rely on a external
1569 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1570 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1571 Note: If you're using cargo you must explicitly pass the `--target` flag.
1572 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1574 \* Refer to Rust's [platform support page][platform-support-doc] for more
1575 information on Rust's tiered platform support.
1579 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1580 and `&Stderr`.][76275]
1581 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1582 - [The `matches!` macro now supports having a trailing comma.][74880]
1583 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1584 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1588 - [`slice::as_ptr_range`]
1589 - [`slice::as_mut_ptr_range`]
1590 - [`VecDeque::make_contiguous`]
1591 - [`future::pending`]
1594 The following previously stable methods are now `const fn`'s:
1596 - [`Option::is_some`]
1597 - [`Option::is_none`]
1598 - [`Option::as_ref`]
1600 - [`Result::is_err`]
1601 - [`Result::as_ref`]
1602 - [`Ordering::reverse`]
1603 - [`Ordering::then`]
1610 - [You can now link to items in `rustdoc` using the intra-doc link
1611 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1612 a link to `std::future`'s documentation. See ["Linking to items by
1613 name"][intradoc-links] for more information.
1614 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1615 when searching through `rustdoc`'s UI.][75740]
1619 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1620 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1621 promoted to `'static` lifetime any more inside `const fn`s.
1622 - [Associated type bindings on trait objects are now verified to meet the bounds
1623 declared on the trait when checking that they implement the trait.][27675]
1624 - [When trait bounds on associated types or opaque types are ambiguous, the
1625 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1626 - [Fixed recursive nonterminals not being expanded in macros during
1627 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1628 correctly handling recursive nonterminal tokens.
1629 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1630 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1631 in places where they have no effect.][73461]
1632 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1633 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1634 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1635 disallow zero-initialization.][71274]
1636 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1637 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1638 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1639 see the [`catch_unwind`] documentation for further information.
1645 These changes provide no direct user facing benefits, but represent significant
1646 improvements to the internals and overall performance of rustc and
1649 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1650 You can continue building with `make` by setting `ninja=false` in
1652 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1653 - [Made `ensure_sufficient_stack()` non-generic][76680]
1655 [78143]: https://github.com/rust-lang/rust/issues/78143
1656 [76680]: https://github.com/rust-lang/rust/pull/76680/
1657 [76030]: https://github.com/rust-lang/rust/pull/76030/
1658 [70212]: https://github.com/rust-lang/rust/pull/70212/
1659 [27675]: https://github.com/rust-lang/rust/issues/27675/
1660 [54121]: https://github.com/rust-lang/rust/issues/54121/
1661 [71274]: https://github.com/rust-lang/rust/pull/71274/
1662 [77386]: https://github.com/rust-lang/rust/pull/77386/
1663 [77153]: https://github.com/rust-lang/rust/pull/77153/
1664 [77055]: https://github.com/rust-lang/rust/pull/77055/
1665 [76275]: https://github.com/rust-lang/rust/pull/76275/
1666 [76310]: https://github.com/rust-lang/rust/pull/76310/
1667 [76420]: https://github.com/rust-lang/rust/pull/76420/
1668 [76158]: https://github.com/rust-lang/rust/pull/76158/
1669 [75857]: https://github.com/rust-lang/rust/pull/75857/
1670 [75585]: https://github.com/rust-lang/rust/pull/75585/
1671 [75740]: https://github.com/rust-lang/rust/pull/75740/
1672 [75502]: https://github.com/rust-lang/rust/pull/75502/
1673 [74880]: https://github.com/rust-lang/rust/pull/74880/
1674 [74922]: https://github.com/rust-lang/rust/pull/74922/
1675 [74430]: https://github.com/rust-lang/rust/pull/74430/
1676 [74194]: https://github.com/rust-lang/rust/pull/74194/
1677 [73461]: https://github.com/rust-lang/rust/pull/73461/
1678 [73166]: https://github.com/rust-lang/rust/pull/73166/
1679 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1680 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1681 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1682 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1683 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1684 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1685 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1686 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1687 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1688 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1689 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1690 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1691 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1692 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1693 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1696 Version 1.47.0 (2020-10-08)
1697 ==========================
1701 - [Closures will now warn when not used.][74869]
1705 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1706 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1708 - [Upgraded to LLVM 11.][73526]
1709 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1710 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1711 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1713 \* Refer to Rust's [platform support page][platform-support-doc] for more
1714 information on Rust's tiered platform support.
1718 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1719 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1720 those of length less than 33.][74060]
1721 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1722 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1723 `PartialEq`, and `PartialOrd`.][73583]
1727 - [`Ident::new_raw`]
1728 - [`Range::is_empty`]
1729 - [`RangeInclusive::is_empty`]
1730 - [`Result::as_deref`]
1731 - [`Result::as_deref_mut`]
1733 - [`pointer::offset_from`]
1737 The following previously stable APIs have now been made const.
1739 - [The `new` method for all `NonZero` integers.][73858]
1740 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1741 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1742 methods for all integers.][73858]
1743 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1744 signed integers.][73858]
1745 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1746 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1747 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1748 `is_ascii_control` methods for `char` and `u8`.][73858]
1752 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1753 You can override this by setting the following in your `Cargo.toml`.
1755 [profile.release.build-override]
1758 - [`cargo-help` will now display man pages for commands rather just the
1759 `--help` text.][cargo/8456]
1760 - [`cargo-metadata` now emits a `test` field indicating if a target has
1761 tests enabled.][cargo/8478]
1762 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1763 - [`cargo-publish` will now use an alternative registry by default if it's the
1764 only registry specified in `package.publish`.][cargo/8571]
1768 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1769 type based search.][75366]
1770 - [Added the Ayu theme to rustdoc.][71237]
1774 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1775 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1776 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1777 help to preserve more span information.][73084] These changes may cause
1778 compiliation errors if your macro was unhygenic or didn't correctly handle
1780 - [Moved support for the CloudABI target to tier 3.][75568]
1781 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1782 - [Added the `rustc-docs` component.][75560] This allows you to install
1783 and read the documentation for the compiler internal APIs. (Currently only
1784 available for `x86_64-unknown-linux-gnu`.)
1789 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
1791 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1792 [75048]: https://github.com/rust-lang/rust/pull/75048/
1793 [74163]: https://github.com/rust-lang/rust/pull/74163/
1794 [71237]: https://github.com/rust-lang/rust/pull/71237/
1795 [74869]: https://github.com/rust-lang/rust/pull/74869/
1796 [73858]: https://github.com/rust-lang/rust/pull/73858/
1797 [75716]: https://github.com/rust-lang/rust/pull/75716/
1798 [75908]: https://github.com/rust-lang/rust/pull/75908/
1799 [75516]: https://github.com/rust-lang/rust/pull/75516/
1800 [75560]: https://github.com/rust-lang/rust/pull/75560/
1801 [75568]: https://github.com/rust-lang/rust/pull/75568/
1802 [75366]: https://github.com/rust-lang/rust/pull/75366/
1803 [75204]: https://github.com/rust-lang/rust/pull/75204/
1804 [74650]: https://github.com/rust-lang/rust/pull/74650/
1805 [74419]: https://github.com/rust-lang/rust/pull/74419/
1806 [73964]: https://github.com/rust-lang/rust/pull/73964/
1807 [74021]: https://github.com/rust-lang/rust/pull/74021/
1808 [74060]: https://github.com/rust-lang/rust/pull/74060/
1809 [73893]: https://github.com/rust-lang/rust/pull/73893/
1810 [73526]: https://github.com/rust-lang/rust/pull/73526/
1811 [73583]: https://github.com/rust-lang/rust/pull/73583/
1812 [73084]: https://github.com/rust-lang/rust/pull/73084/
1813 [73197]: https://github.com/rust-lang/rust/pull/73197/
1814 [72488]: https://github.com/rust-lang/rust/pull/72488/
1815 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1816 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1817 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1818 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1819 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1820 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1821 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1822 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1823 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1824 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1825 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1826 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1827 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1828 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1829 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1832 Version 1.46.0 (2020-08-27)
1833 ==========================
1837 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1838 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1839 const functions.][73862]
1840 - [The `#[track_caller]` attribute can now be added to functions to use the
1841 function's caller's location information for panic messages.][72445]
1842 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1843 `x.0.0` over `(x.0).0`.
1844 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1845 You currently can't use `mem::transmute` in constant functions.
1849 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1850 - [Enabled static "Position Independent Executables" by default
1851 for `x86_64-unknown-linux-musl`.][70740]
1855 - [`mem::forget` is now a `const fn`.][73887]
1856 - [`String` now implements `From<char>`.][73466]
1857 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1858 integer types.][73032]
1859 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1860 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1861 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1862 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1863 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1864 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1869 - [`vec::Drain::as_slice`]
1873 Added a number of new environment variables that are now available when
1874 compiling your crate.
1876 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1877 the specific binary being compiled and the name of the crate.
1878 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1879 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1883 - [The target configuration option `abi_blacklist` has been renamed
1884 to `unsupported_abis`.][74150] The old name will still continue to work.
1885 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1886 This was previously accepted but will become a hard error in a future release.
1887 - [Rustc will fail to compile if you have a struct with
1888 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1890 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1891 ensure that spans have the correct information, and may cause breakage if you
1892 were relying on receiving spans with dummy information.
1893 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1894 a legacy installer that was replaced by a MSI installer a few years ago but
1895 was still being built.
1896 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1897 - [Rustc will no longer accept overlapping trait implementations that only
1898 differ in how the lifetime was bound.][72493]
1899 - [Rustc now correctly relates the lifetime of an existential associated
1900 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1901 you to pass a shorter lifetime than expected.
1902 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1903 The library will need to be installed for `rustc` to work, even though we
1904 expect it to be already available on most systems.
1905 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1907 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1908 exact output returned by rustc's pretty printing is an unstable
1909 implementation detail: we recommend any macro relying on it to switch to a
1910 more robust parsing system.
1912 [75453]: https://github.com/rust-lang/rust/issues/75453/
1913 [74820]: https://github.com/rust-lang/rust/issues/74820/
1914 [74420]: https://github.com/rust-lang/rust/issues/74420/
1915 [74109]: https://github.com/rust-lang/rust/pull/74109/
1916 [74150]: https://github.com/rust-lang/rust/pull/74150/
1917 [73862]: https://github.com/rust-lang/rust/pull/73862/
1918 [73887]: https://github.com/rust-lang/rust/pull/73887/
1919 [73466]: https://github.com/rust-lang/rust/pull/73466/
1920 [73516]: https://github.com/rust-lang/rust/pull/73516/
1921 [73293]: https://github.com/rust-lang/rust/pull/73293/
1922 [73007]: https://github.com/rust-lang/rust/pull/73007/
1923 [73032]: https://github.com/rust-lang/rust/pull/73032/
1924 [72920]: https://github.com/rust-lang/rust/pull/72920/
1925 [72569]: https://github.com/rust-lang/rust/pull/72569/
1926 [72583]: https://github.com/rust-lang/rust/pull/72583/
1927 [72584]: https://github.com/rust-lang/rust/pull/72584/
1928 [72717]: https://github.com/rust-lang/rust/pull/72717/
1929 [72437]: https://github.com/rust-lang/rust/pull/72437/
1930 [72445]: https://github.com/rust-lang/rust/pull/72445/
1931 [72486]: https://github.com/rust-lang/rust/pull/72486/
1932 [72493]: https://github.com/rust-lang/rust/pull/72493/
1933 [72331]: https://github.com/rust-lang/rust/pull/72331/
1934 [71896]: https://github.com/rust-lang/rust/pull/71896/
1935 [71660]: https://github.com/rust-lang/rust/pull/71660/
1936 [71322]: https://github.com/rust-lang/rust/pull/71322/
1937 [70740]: https://github.com/rust-lang/rust/pull/70740/
1938 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1939 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1940 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1941 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1942 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1945 Version 1.45.2 (2020-08-03)
1946 ==========================
1948 * [Fix bindings in tuple struct patterns][74954]
1949 * [Fix track_caller integration with trait objects][74784]
1951 [74954]: https://github.com/rust-lang/rust/issues/74954
1952 [74784]: https://github.com/rust-lang/rust/issues/74784
1955 Version 1.45.1 (2020-07-30)
1956 ==========================
1958 * [Fix const propagation with references.][73613]
1959 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1960 * [Avoid spurious implicit region bound.][74509]
1961 * [Install clippy on x.py install][74457]
1963 [73613]: https://github.com/rust-lang/rust/pull/73613
1964 [73078]: https://github.com/rust-lang/rust/issues/73078
1965 [74509]: https://github.com/rust-lang/rust/pull/74509
1966 [74457]: https://github.com/rust-lang/rust/pull/74457
1969 Version 1.45.0 (2020-07-16)
1970 ==========================
1974 - [Out of range float to int conversions using `as` has been defined as a saturating
1975 conversion.][71269] This was previously undefined behaviour, but you can use the
1976 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1977 may be desirable in rare performance sensitive situations.
1978 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1979 using `u64`.][70705]
1980 - [Function like procedural macros can now be used in expression, pattern, and statement
1981 positions.][68717] This means you can now use a function-like procedural macro
1982 anywhere you can use a declarative (`macro_rules!`) macro.
1986 - [You can now override individual target features through the `target-feature`
1987 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1988 equivalent to `-C target-feature=+avx2,+fma`.
1989 - [Added the `force-unwind-tables` flag.][69984] This option allows
1990 rustc to always generate unwind tables regardless of panic strategy.
1991 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1992 to include LLVM bitcode into generated `rlib`s (this is on by default).
1993 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1994 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1995 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1996 - [Upgraded to LLVM 10.][67759]
1998 \* Refer to Rust's [platform support page][platform-support-doc] for more
1999 information on Rust's tiered platform support.
2004 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2006 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2007 - [You can now use `char` with
2008 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2009 a range of codepoints.][72413] E.g.
2010 you can now write the following;
2012 for ch in 'a'..='z' {
2016 // Prints "abcdefghijklmnopqrstuvwxyz"
2018 - [`OsString` now implements `FromStr`.][71662]
2019 - [The `saturating_neg` method has been added to all signed integer primitive
2020 types, and the `saturating_abs` method has been added for all integer
2021 primitive types.][71886]
2022 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2023 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2025 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2026 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2027 integer types.][69813]
2028 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2029 integer types.][72324]
2030 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2035 - [`BTreeMap::remove_entry`]
2037 - [`rc::Weak::as_ptr`]
2038 - [`rc::Weak::from_raw`]
2039 - [`rc::Weak::into_raw`]
2040 - [`str::strip_prefix`]
2041 - [`str::strip_suffix`]
2042 - [`sync::Weak::as_ptr`]
2043 - [`sync::Weak::from_raw`]
2044 - [`sync::Weak::into_raw`]
2045 - [`char::UNICODE_VERSION`]
2046 - [`Span::resolved_at`]
2047 - [`Span::located_at`]
2048 - [`Span::mixed_site`]
2049 - [`unix::process::CommandExt::arg0`]
2054 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2059 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2060 `~~outdated information~~` becomes "~~outdated information~~".
2061 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2065 - [Trying to self initialize a static value (that is creating a value using
2066 itself) is unsound and now causes a compile error.][71140]
2067 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2068 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2069 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2070 previously undocumented and not intended for public use. Rustdoc still provides
2071 a non-zero exit code on errors.
2072 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2073 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2074 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2075 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2076 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2080 - [Make clippy a git subtree instead of a git submodule][70655]
2081 - [Unify the undo log of all snapshot types][69464]
2083 [71848]: https://github.com/rust-lang/rust/issues/71848/
2084 [73420]: https://github.com/rust-lang/rust/issues/73420/
2085 [72324]: https://github.com/rust-lang/rust/pull/72324/
2086 [71843]: https://github.com/rust-lang/rust/pull/71843/
2087 [71886]: https://github.com/rust-lang/rust/pull/71886/
2088 [72234]: https://github.com/rust-lang/rust/pull/72234/
2089 [72239]: https://github.com/rust-lang/rust/pull/72239/
2090 [72397]: https://github.com/rust-lang/rust/pull/72397/
2091 [72413]: https://github.com/rust-lang/rust/pull/72413/
2092 [72014]: https://github.com/rust-lang/rust/pull/72014/
2093 [72062]: https://github.com/rust-lang/rust/pull/72062/
2094 [72094]: https://github.com/rust-lang/rust/pull/72094/
2095 [72133]: https://github.com/rust-lang/rust/pull/72133/
2096 [67759]: https://github.com/rust-lang/rust/pull/67759/
2097 [71900]: https://github.com/rust-lang/rust/pull/71900/
2098 [71928]: https://github.com/rust-lang/rust/pull/71928/
2099 [71662]: https://github.com/rust-lang/rust/pull/71662/
2100 [71716]: https://github.com/rust-lang/rust/pull/71716/
2101 [71447]: https://github.com/rust-lang/rust/pull/71447/
2102 [71269]: https://github.com/rust-lang/rust/pull/71269/
2103 [71095]: https://github.com/rust-lang/rust/pull/71095/
2104 [71140]: https://github.com/rust-lang/rust/pull/71140/
2105 [70655]: https://github.com/rust-lang/rust/pull/70655/
2106 [70705]: https://github.com/rust-lang/rust/pull/70705/
2107 [69984]: https://github.com/rust-lang/rust/pull/69984/
2108 [69813]: https://github.com/rust-lang/rust/pull/69813/
2109 [69464]: https://github.com/rust-lang/rust/pull/69464/
2110 [68717]: https://github.com/rust-lang/rust/pull/68717/
2111 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2112 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2113 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2114 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2115 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2116 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2117 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2118 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2119 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2120 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2121 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2122 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2123 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2124 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2125 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2126 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2127 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2130 Version 1.44.1 (2020-06-18)
2131 ===========================
2133 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2134 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2135 * [Fix crashes when finding backtrace on macOS.][71397]
2136 * [Clippy applies lint levels into different files.][clippy/5356]
2138 [71397]: https://github.com/rust-lang/rust/issues/71397
2139 [73078]: https://github.com/rust-lang/rust/issues/73078
2140 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2141 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2144 Version 1.44.0 (2020-06-04)
2145 ==========================
2149 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2150 - [Added the `unused_braces` lint.][70081]
2152 **Syntax-only changes**
2154 - [Expansion-driven outline module parsing][69838]
2159 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2164 These are still rejected semantically, so you will likely receive an error but
2165 these changes can be seen and parsed by macros and conditional compilation.
2169 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2170 Additionally when in incremental mode rustc defaults to 256 codegen units.
2171 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2172 a panic is thrown.][67502]
2173 - [Added tier 3\* support for the `aarch64-unknown-none` and
2174 `aarch64-unknown-none-softfloat` targets.][68334]
2175 - [Added tier 3 support for `arm64-apple-tvos` and
2176 `x86_64-apple-tvos` targets.][68191]
2181 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2182 `vec![]` to be able to be used in `const` contexts.
2183 - [`convert::Infallible` now implements `Hash`.][70281]
2184 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2185 a `&mut OsStr`.][70048]
2186 - [Unicode 13 is now supported.][69929]
2187 - [`String` now implements `From<&mut str>`.][69661]
2188 - [`IoSlice` now implements `Copy`.][69403]
2189 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2190 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2191 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2192 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2193 integer types.][69373]
2197 - [`PathBuf::with_capacity`]
2198 - [`PathBuf::capacity`]
2199 - [`PathBuf::clear`]
2200 - [`PathBuf::reserve`]
2201 - [`PathBuf::reserve_exact`]
2202 - [`PathBuf::shrink_to_fit`]
2203 - [`f32::to_int_unchecked`]
2204 - [`f64::to_int_unchecked`]
2205 - [`Layout::align_to`]
2206 - [`Layout::pad_to_align`]
2208 - [`Layout::extend`]
2212 - [Added the `cargo tree` command which will print a tree graph of
2213 your dependencies.][cargo/8062] E.g.
2215 mdbook v0.3.2 (/Users/src/rust/mdbook)
2217 │ ├── html5ever v0.24.0
2219 │ │ │ └── cfg-if v0.1.9
2221 │ │ └── markup5ever v0.9.0
2222 │ │ ├── log v0.4.8 (*)
2224 │ │ │ └── phf_shared v0.7.24
2225 │ │ │ ├── siphasher v0.2.3
2226 │ │ │ └── unicase v1.4.2
2227 │ │ │ [build-dependencies]
2228 │ │ │ └── version_check v0.1.5
2231 You can also display dependencies on multiple versions of the same crate with
2232 `cargo tree -d` (short for `cargo tree --duplicates`).
2236 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2237 the version in the sidebar.][69494]
2241 - [Rustc now correctly generates static libraries on Windows GNU targets with
2242 the `.a` extension, rather than the previous `.lib`.][70937]
2243 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2244 - [The `file_name` property in JSON output of macro errors now points the actual
2245 source file rather than the previous format of `<NAME macros>`.][70969]
2246 **Note:** this may not point to a file that actually exists on the user's system.
2247 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2248 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2249 not allow zero initialization such as `NonZeroU8`.][66059] This was
2250 previously a warning.
2251 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2252 operator has been defined as a saturating operation.][71269] This was previously
2253 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2254 continue using the current behaviour, which may be desirable in rare performance
2255 sensitive situations.
2259 These changes provide no direct user facing benefits, but represent significant
2260 improvements to the internals and overall performance of rustc and
2263 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2264 - [Replace big JS dict with JSON parsing.][71250]
2266 [69373]: https://github.com/rust-lang/rust/pull/69373/
2267 [66059]: https://github.com/rust-lang/rust/pull/66059/
2268 [68191]: https://github.com/rust-lang/rust/pull/68191/
2269 [68899]: https://github.com/rust-lang/rust/pull/68899/
2270 [71147]: https://github.com/rust-lang/rust/pull/71147/
2271 [71250]: https://github.com/rust-lang/rust/pull/71250/
2272 [70937]: https://github.com/rust-lang/rust/pull/70937/
2273 [70969]: https://github.com/rust-lang/rust/pull/70969/
2274 [70632]: https://github.com/rust-lang/rust/pull/70632/
2275 [70281]: https://github.com/rust-lang/rust/pull/70281/
2276 [70345]: https://github.com/rust-lang/rust/pull/70345/
2277 [70048]: https://github.com/rust-lang/rust/pull/70048/
2278 [70081]: https://github.com/rust-lang/rust/pull/70081/
2279 [70156]: https://github.com/rust-lang/rust/pull/70156/
2280 [71269]: https://github.com/rust-lang/rust/pull/71269/
2281 [69838]: https://github.com/rust-lang/rust/pull/69838/
2282 [69929]: https://github.com/rust-lang/rust/pull/69929/
2283 [69661]: https://github.com/rust-lang/rust/pull/69661/
2284 [69778]: https://github.com/rust-lang/rust/pull/69778/
2285 [69494]: https://github.com/rust-lang/rust/pull/69494/
2286 [69403]: https://github.com/rust-lang/rust/pull/69403/
2287 [69033]: https://github.com/rust-lang/rust/pull/69033/
2288 [68692]: https://github.com/rust-lang/rust/pull/68692/
2289 [68334]: https://github.com/rust-lang/rust/pull/68334/
2290 [67502]: https://github.com/rust-lang/rust/pull/67502/
2291 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2292 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2293 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2294 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2295 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2296 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2297 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2298 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2299 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2300 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2301 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2302 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2303 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2306 Version 1.43.1 (2020-05-07)
2307 ===========================
2309 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2310 * [Fixed the stabilization of AVX-512 features.][71473]
2311 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2313 [71430]: https://github.com/rust-lang/rust/pull/71430
2314 [71473]: https://github.com/rust-lang/rust/issues/71473
2315 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2318 Version 1.43.0 (2020-04-23)
2319 ==========================
2323 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2324 the type inferred correctly.][68129]
2325 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2327 **Syntax only changes**
2328 - [Allow `type Foo: Ord` syntactically.][69361]
2329 - [Fuse associated and extern items up to defaultness.][69194]
2330 - [Syntactically allow `self` in all `fn` contexts.][68764]
2331 - [Merge `fn` syntax + cleanup item parsing.][68728]
2332 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2333 For example, you may now write:
2335 macro_rules! mac_trait {
2345 These are still rejected *semantically*, so you will likely receive an error but
2346 these changes can be seen and parsed by macros and
2347 conditional compilation.
2352 - [You can now pass multiple lint flags to rustc to override the previous
2353 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2354 everything in the `unused` lint group except `unused-variables` which
2355 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2356 everything in the `unused` lint group **including** `unused-variables` since
2357 the allow flag is specified before the deny flag (and therefore overridden).
2358 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2359 if they are available on `windows-gnu`.][67429]
2360 - [rustc now buffers errors/warnings printed in JSON.][69227]
2364 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2365 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2366 respectively.][69538] **Note** These conversions are only available when `N`
2368 - [You can now use associated constants on floats and integers directly, rather
2369 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2370 `f32::NAN` with no imports.
2371 - [`u8::is_ascii` is now `const`.][68984]
2372 - [`String` now implements `AsMut<str>`.][68742]
2373 - [Added the `primitive` module to `std` and `core`.][67637] This module
2374 reexports Rust's primitive types. This is mainly useful in macros
2375 where you want avoid these types being shadowed.
2376 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2377 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2381 - [`Once::is_completed`]
2386 - [`iter::once_with`]
2390 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2391 your environment.][cargo/7823]
2392 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2393 executable path when running integration tests or benchmarks.][cargo/7697]
2394 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2395 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2399 - [Certain checks in the `const_err` lint were deemed unrelated to const
2400 evaluation][69185], and have been moved to the `unconditional_panic` and
2401 `arithmetic_overflow` lints.
2406 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2407 has been a warning since 1.36.0.
2408 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2409 led to some instances being accepted, and now correctly emits a hard error.
2411 [69340]: https://github.com/rust-lang/rust/pull/69340
2415 These changes provide no direct user facing benefits, but represent significant
2416 improvements to the internals and overall performance of `rustc` and
2419 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2420 - [Improved how rustc generates drop code.][67332]
2421 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2422 - [traits: preallocate 2 Vecs of known initial size][69022]
2423 - [Avoid exponential behaviour when relating types][68772]
2424 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2425 - [Improve performance of coherence checks][68966]
2426 - [Deduplicate types in the generator witness][68672]
2427 - [Invert control in struct_lint_level.][68725]
2429 [67332]: https://github.com/rust-lang/rust/pull/67332/
2430 [67429]: https://github.com/rust-lang/rust/pull/67429/
2431 [67637]: https://github.com/rust-lang/rust/pull/67637/
2432 [67642]: https://github.com/rust-lang/rust/pull/67642/
2433 [67878]: https://github.com/rust-lang/rust/pull/67878/
2434 [67885]: https://github.com/rust-lang/rust/pull/67885/
2435 [68129]: https://github.com/rust-lang/rust/pull/68129/
2436 [68672]: https://github.com/rust-lang/rust/pull/68672/
2437 [68725]: https://github.com/rust-lang/rust/pull/68725/
2438 [68728]: https://github.com/rust-lang/rust/pull/68728/
2439 [68738]: https://github.com/rust-lang/rust/pull/68738/
2440 [68742]: https://github.com/rust-lang/rust/pull/68742/
2441 [68764]: https://github.com/rust-lang/rust/pull/68764/
2442 [68772]: https://github.com/rust-lang/rust/pull/68772/
2443 [68943]: https://github.com/rust-lang/rust/pull/68943/
2444 [68952]: https://github.com/rust-lang/rust/pull/68952/
2445 [68966]: https://github.com/rust-lang/rust/pull/68966/
2446 [68984]: https://github.com/rust-lang/rust/pull/68984/
2447 [69022]: https://github.com/rust-lang/rust/pull/69022/
2448 [69185]: https://github.com/rust-lang/rust/pull/69185/
2449 [69194]: https://github.com/rust-lang/rust/pull/69194/
2450 [69201]: https://github.com/rust-lang/rust/pull/69201/
2451 [69227]: https://github.com/rust-lang/rust/pull/69227/
2452 [69548]: https://github.com/rust-lang/rust/pull/69548/
2453 [69256]: https://github.com/rust-lang/rust/pull/69256/
2454 [69361]: https://github.com/rust-lang/rust/pull/69361/
2455 [69366]: https://github.com/rust-lang/rust/pull/69366/
2456 [69538]: https://github.com/rust-lang/rust/pull/69538/
2457 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2458 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2459 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2460 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2461 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2462 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2463 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2464 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2467 Version 1.42.0 (2020-03-12)
2468 ==========================
2472 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2474 fn foo(words: &[&str]) {
2476 ["Hello", "World", "!", ..] => println!("Hello World!"),
2477 ["Foo", "Bar", ..] => println!("Baz"),
2478 rest => println!("{:?}", rest),
2482 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2483 that you can create an enum that has the exact layout and ABI of the type
2485 - [You can now use outer attribute procedural macros on inline modules.][64273]
2486 - [There are some *syntax-only* changes:][67131]
2487 - `default` is syntactically allowed before items in `trait` definitions.
2488 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2489 leave out their bodies in favor of `;`.
2490 - Bounds on associated types in `impl`s are now syntactically allowed
2491 (e.g. `type Foo: Ord;`).
2492 - `...` (the C-variadic type) may occur syntactically directly as the type of
2493 any function parameter.
2495 These are still rejected *semantically*, so you will likely receive an error
2496 but these changes can be seen and parsed by procedural macros and
2497 conditional compilation.
2501 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2502 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2503 - [`Option::{expect,unwrap}` and
2504 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2505 pointing to the location where they were called, rather than
2506 `core`'s internals. ][67887]
2508 \* Refer to Rust's [platform support page][platform-support-doc] for more
2509 information on Rust's tiered platform support.
2513 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2514 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2515 to implement `Sized`.][67935]
2516 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2517 - [`Layout::new` is now `const`.][66254]
2518 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2523 - [`CondVar::wait_while`]
2524 - [`CondVar::wait_timeout_while`]
2526 - [`DebugMap::value`]
2527 - [`ManuallyDrop::take`]
2529 - [`ptr::slice_from_raw_parts_mut`]
2530 - [`ptr::slice_from_raw_parts`]
2534 - [You no longer need to include `extern crate proc_macro;` to be able to
2535 `use proc_macro;` in the `2018` edition.][cargo/7700]
2539 - [`Error::description` has been deprecated, and its use will now produce a
2540 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2542 [68253]: https://github.com/rust-lang/rust/pull/68253/
2543 [68348]: https://github.com/rust-lang/rust/pull/68348/
2544 [67935]: https://github.com/rust-lang/rust/pull/67935/
2545 [68339]: https://github.com/rust-lang/rust/pull/68339/
2546 [68122]: https://github.com/rust-lang/rust/pull/68122/
2547 [64273]: https://github.com/rust-lang/rust/pull/64273/
2548 [67712]: https://github.com/rust-lang/rust/pull/67712/
2549 [67887]: https://github.com/rust-lang/rust/pull/67887/
2550 [67131]: https://github.com/rust-lang/rust/pull/67131/
2551 [67233]: https://github.com/rust-lang/rust/pull/67233/
2552 [66899]: https://github.com/rust-lang/rust/pull/66899/
2553 [66919]: https://github.com/rust-lang/rust/pull/66919/
2554 [66254]: https://github.com/rust-lang/rust/pull/66254/
2555 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2556 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2557 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2558 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2559 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2560 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2561 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2562 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2563 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2566 Version 1.41.1 (2020-02-27)
2567 ===========================
2569 * [Always check types of static items][69145]
2570 * [Always check lifetime bounds of `Copy` impls][69145]
2571 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2573 [69225]: https://github.com/rust-lang/rust/issues/69225
2574 [69145]: https://github.com/rust-lang/rust/pull/69145
2577 Version 1.41.0 (2020-01-30)
2578 ===========================
2583 - [You can now pass type parameters to foreign items when implementing
2584 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2585 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2586 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2587 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2588 - [You can now use any valid identifier in a `format_args` macro.][66847]
2589 Previously identifiers starting with an underscore were not allowed.
2590 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2591 enum variants.][66183] These are still rejected semantically, but
2592 can be seen and parsed by procedural macros and conditional compilation.
2593 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2594 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2595 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2597 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2602 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2603 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2604 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2605 - [You can now pass an arguments file passing the `@path` syntax
2606 to rustc.][66172] Note that the format differs somewhat from what is
2607 found in other tooling; please see [the documentation][argfile-docs] for
2609 - [You can now provide `--extern` flag without a path, indicating that it is
2610 available from the search path or specified with an `-L` flag.][64882]
2612 \* Refer to Rust's [platform support page][platform-support-doc] for more
2613 information on Rust's tiered platform support.
2615 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2620 - [The `core::panic` module is now stable.][66771] It was already stable
2622 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2623 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2624 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2629 - [`Result::map_or`]
2630 - [`Result::map_or_else`]
2631 - [`std::rc::Weak::weak_count`]
2632 - [`std::rc::Weak::strong_count`]
2633 - [`std::sync::Weak::weak_count`]
2634 - [`std::sync::Weak::strong_count`]
2639 - [Cargo will now document all the private items for binary crates
2640 by default.][cargo/7593]
2641 - [`cargo-install` will now reinstall the package if it detects that it is out
2642 of date.][cargo/7560]
2643 - [Cargo.lock now uses a more git friendly format that should help to reduce
2644 merge conflicts.][cargo/7579]
2645 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2646 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2647 optimisation level to `2` for debug builds. You can also use
2648 `[profile.<profile>.build-override]` to override build scripts and
2654 - [You can now specify `edition` in documentation code blocks to compile the block
2655 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2656 should be compiled the 2018 edition of Rust.
2657 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2658 current theme with `--check-theme`.][54733]
2659 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2664 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2665 Apple targets.][apple-32bit-drop] This means that the source code is still
2666 available to build, but the targets are no longer being tested and release
2667 binaries for those platforms will no longer be distributed by the Rust project.
2668 Please refer to the linked blog post for more information.
2670 [54733]: https://github.com/rust-lang/rust/pull/54733/
2671 [61351]: https://github.com/rust-lang/rust/pull/61351/
2672 [62514]: https://github.com/rust-lang/rust/pull/62514/
2673 [67255]: https://github.com/rust-lang/rust/pull/67255/
2674 [66661]: https://github.com/rust-lang/rust/pull/66661/
2675 [66771]: https://github.com/rust-lang/rust/pull/66771/
2676 [66847]: https://github.com/rust-lang/rust/pull/66847/
2677 [66238]: https://github.com/rust-lang/rust/pull/66238/
2678 [66277]: https://github.com/rust-lang/rust/pull/66277/
2679 [66325]: https://github.com/rust-lang/rust/pull/66325/
2680 [66172]: https://github.com/rust-lang/rust/pull/66172/
2681 [66183]: https://github.com/rust-lang/rust/pull/66183/
2682 [65879]: https://github.com/rust-lang/rust/pull/65879/
2683 [65013]: https://github.com/rust-lang/rust/pull/65013/
2684 [64882]: https://github.com/rust-lang/rust/pull/64882/
2685 [64325]: https://github.com/rust-lang/rust/pull/64325/
2686 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2687 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2688 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2689 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2690 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2691 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2692 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2693 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2694 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2695 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2696 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2698 Version 1.40.0 (2019-12-19)
2699 ===========================
2703 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2704 `const` contexts.][65188] e.g.
2707 pub struct Point(i32, i32);
2709 const ORIGIN: Point = {
2710 let constructor = Point;
2716 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2717 indicate that there may be variants or fields added in the future.][64639]
2718 For example this requires adding a wild-card branch (`_ => {}`) to any match
2719 statements on a non-exhaustive `enum`. [(RFC 2008)]
2720 - [You can now use function-like procedural macros in `extern` blocks and in
2721 type positions.][63931] e.g. `type Generated = macro!();`
2722 - [Function-like and attribute procedural macros can now emit
2723 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2724 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2725 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2726 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2730 - [Added tier 3 support\* for the
2731 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2732 - [Added tier 3 support for the
2733 `aarch64-unknown-none-softfloat` target.][64589]
2734 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2735 `mips64el-unknown-linux-muslabi64` targets.][65843]
2737 \* Refer to Rust's [platform support page][platform-support-doc] for more
2738 information on Rust's tiered platform support.
2742 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2746 - [`BTreeMap::get_key_value`]
2747 - [`HashMap::get_key_value`]
2748 - [`Option::as_deref_mut`]
2749 - [`Option::as_deref`]
2750 - [`Option::flatten`]
2751 - [`UdpSocket::peer_addr`]
2752 - [`f32::to_be_bytes`]
2753 - [`f32::to_le_bytes`]
2754 - [`f32::to_ne_bytes`]
2755 - [`f64::to_be_bytes`]
2756 - [`f64::to_le_bytes`]
2757 - [`f64::to_ne_bytes`]
2758 - [`f32::from_be_bytes`]
2759 - [`f32::from_le_bytes`]
2760 - [`f32::from_ne_bytes`]
2761 - [`f64::from_be_bytes`]
2762 - [`f64::from_le_bytes`]
2763 - [`f64::from_ne_bytes`]
2770 - [Cargo will now always display warnings, rather than only on
2771 fresh builds.][cargo/7450]
2772 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2773 now produce an error.][cargo/7507] Previously these flags were ignored.
2774 - [You can now publish `dev-dependencies` without including
2775 a `version`.][cargo/7333]
2779 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2780 when running documentation tests with `rustdoc`.][63803]
2784 - [As previously announced, any previous NLL warnings in the 2015 edition are
2785 now hard errors.][64221]
2786 - [The `include!` macro will now warn if it failed to include the
2787 entire file.][64284] The `include!` macro unintentionally only includes the
2788 first _expression_ in a file, and this can be unintuitive. This will become
2789 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2790 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2791 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2792 or `extern` blocks now correctly emits a hard error.
2794 [65294]: https://github.com/rust-lang/rust/pull/65294/
2795 [66103]: https://github.com/rust-lang/rust/pull/66103/
2796 [65843]: https://github.com/rust-lang/rust/pull/65843/
2797 [65188]: https://github.com/rust-lang/rust/pull/65188/
2798 [65092]: https://github.com/rust-lang/rust/pull/65092/
2799 [64589]: https://github.com/rust-lang/rust/pull/64589/
2800 [64639]: https://github.com/rust-lang/rust/pull/64639/
2801 [64221]: https://github.com/rust-lang/rust/pull/64221/
2802 [64284]: https://github.com/rust-lang/rust/pull/64284/
2803 [63931]: https://github.com/rust-lang/rust/pull/63931/
2804 [64035]: https://github.com/rust-lang/rust/pull/64035/
2805 [63674]: https://github.com/rust-lang/rust/pull/63674/
2806 [63803]: https://github.com/rust-lang/rust/pull/63803/
2807 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2808 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2809 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2810 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2811 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2812 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2813 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2814 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2815 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2816 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2817 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2818 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2819 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2820 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2821 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2822 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2823 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2824 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2825 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2826 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2827 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2828 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2829 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2830 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2831 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2832 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2835 Version 1.39.0 (2019-11-07)
2836 ===========================
2840 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2841 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2842 - [You can now use certain attributes on function, closure, and function pointer
2843 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2844 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2845 attributes applied to items. e.g.
2848 #[cfg(windows)] slice: &[u16],
2849 #[cfg(not(windows))] slice: &[u8],
2854 - [You can now take shared references to bind-by-move patterns in the `if` guards
2855 of `match` arms.][63118] e.g.
2858 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2862 // ---- `nums` is bound by move.
2863 if nums.iter().sum::<u8>() == 10
2864 // ^------ `.iter()` implicitly takes a reference to `nums`.
2867 // ----------- Legal as `nums` was bound by move and so we have ownership.
2869 _ => unreachable!(),
2878 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2879 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2880 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2881 **Note** Cargo currently doesn't use this feature. Refer to
2882 [cargo#7315][cargo/7315] to track this feature's progress.
2883 - [You can now pass `--show-output` argument to test binaries to print the
2884 output of successful tests.][62600]
2887 \* Refer to Rust's [platform support page][platform-support-doc] for more
2888 information on Rust's tiered platform support.
2892 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2893 - [`LinkedList::new` is now a `const` function.][63684]
2894 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2895 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2896 now `const`.][63786]
2900 - [`Pin::into_inner`]
2901 - [`Instant::checked_duration_since`]
2902 - [`Instant::saturating_duration_since`]
2906 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2907 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2908 `--all` is now deprecated.
2912 - [You can now pass `-Clinker` to rustdoc to control the linker used
2913 for compiling doctests.][63834]
2917 - [Code that was previously accepted by the old borrow checker, but rejected by
2918 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2919 previously a warning, and will also become a hard error in the Rust 2015
2920 edition in the 1.40.0 release.
2921 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2922 run tests.][63827] This should improve performance when running a large
2924 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2925 recommended to use the `?` operator instead.
2926 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2929 [62600]: https://github.com/rust-lang/rust/pull/62600/
2930 [62672]: https://github.com/rust-lang/rust/pull/62672/
2931 [63118]: https://github.com/rust-lang/rust/pull/63118/
2932 [63209]: https://github.com/rust-lang/rust/pull/63209/
2933 [63402]: https://github.com/rust-lang/rust/pull/63402/
2934 [63565]: https://github.com/rust-lang/rust/pull/63565/
2935 [63595]: https://github.com/rust-lang/rust/pull/63595/
2936 [63684]: https://github.com/rust-lang/rust/pull/63684/
2937 [63698]: https://github.com/rust-lang/rust/pull/63698/
2938 [63770]: https://github.com/rust-lang/rust/pull/63770/
2939 [63786]: https://github.com/rust-lang/rust/pull/63786/
2940 [63827]: https://github.com/rust-lang/rust/pull/63827/
2941 [63834]: https://github.com/rust-lang/rust/pull/63834/
2942 [63927]: https://github.com/rust-lang/rust/pull/63927/
2943 [63933]: https://github.com/rust-lang/rust/pull/63933/
2944 [63934]: https://github.com/rust-lang/rust/pull/63934/
2945 [63938]: https://github.com/rust-lang/rust/pull/63938/
2946 [63940]: https://github.com/rust-lang/rust/pull/63940/
2947 [63941]: https://github.com/rust-lang/rust/pull/63941/
2948 [63945]: https://github.com/rust-lang/rust/pull/63945/
2949 [64010]: https://github.com/rust-lang/rust/pull/64010/
2950 [64028]: https://github.com/rust-lang/rust/pull/64028/
2951 [64334]: https://github.com/rust-lang/rust/pull/64334/
2952 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2953 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2954 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2955 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2956 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2957 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2959 Version 1.38.0 (2019-09-26)
2960 ==========================
2964 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2965 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2969 - [Added pipelined compilation support to `rustc`.][62766] This will
2970 improve compilation times in some cases. For further information please refer
2971 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2972 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2973 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2974 `x86_64-uwp-windows-msvc` targets.][60260]
2975 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2976 `armv7-unknown-linux-musleabi` targets.][63107]
2977 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2978 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2979 - [Upgraded to LLVM 9.][62592]
2981 \* Refer to Rust's [platform support page][platform-support-doc] for more
2982 information on Rust's tiered platform support.
2986 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2987 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2988 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2989 is available at `std::clone::Clone`). This also makes all built-in macros
2990 available in `std`/`core` root. e.g. `std::include_bytes!`.
2991 - [`str::Chars` now implements `Debug`.][63000]
2992 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2993 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2994 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2995 - [Added euclidean remainder and division operations (`div_euclid`,
2996 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2997 `overflowing`, and `wrapping` versions are available for all
2999 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3000 `PartialEq`.][61491]
3001 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3005 - [`<*const T>::cast`]
3006 - [`<*mut T>::cast`]
3007 - [`Duration::as_secs_f32`]
3008 - [`Duration::as_secs_f64`]
3009 - [`Duration::div_f32`]
3010 - [`Duration::div_f64`]
3011 - [`Duration::from_secs_f32`]
3012 - [`Duration::from_secs_f64`]
3013 - [`Duration::mul_f32`]
3014 - [`Duration::mul_f64`]
3015 - [`any::type_name`]
3019 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3020 - [You can now pass the `--features` option multiple times to enable
3021 multiple features.][cargo/7084]
3026 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3030 - [`rustc` will now warn about some incorrect uses of
3031 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3035 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3037 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3038 issues][62896] with certain crates such as libc.
3040 [60260]: https://github.com/rust-lang/rust/pull/60260/
3041 [61457]: https://github.com/rust-lang/rust/pull/61457/
3042 [61491]: https://github.com/rust-lang/rust/pull/61491/
3043 [61884]: https://github.com/rust-lang/rust/pull/61884/
3044 [61953]: https://github.com/rust-lang/rust/pull/61953/
3045 [62042]: https://github.com/rust-lang/rust/pull/62042/
3046 [62528]: https://github.com/rust-lang/rust/pull/62528/
3047 [62583]: https://github.com/rust-lang/rust/pull/62583/
3048 [62735]: https://github.com/rust-lang/rust/pull/62735/
3049 [62766]: https://github.com/rust-lang/rust/pull/62766/
3050 [62784]: https://github.com/rust-lang/rust/pull/62784/
3051 [62592]: https://github.com/rust-lang/rust/pull/62592/
3052 [62785]: https://github.com/rust-lang/rust/issues/62785/
3053 [62814]: https://github.com/rust-lang/rust/pull/62814/
3054 [62896]: https://github.com/rust-lang/rust/issues/62896/
3055 [63000]: https://github.com/rust-lang/rust/pull/63000/
3056 [63056]: https://github.com/rust-lang/rust/pull/63056/
3057 [63107]: https://github.com/rust-lang/rust/pull/63107/
3058 [63346]: https://github.com/rust-lang/rust/pull/63346/
3059 [63421]: https://github.com/rust-lang/rust/pull/63421/
3060 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3061 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3062 [63048]: https://github.com/rust-lang/rust/pull/63048
3063 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3064 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3065 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3066 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3067 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3068 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3069 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3070 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3071 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3072 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3073 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3074 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3075 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3077 Version 1.37.0 (2019-08-15)
3078 ==========================
3082 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3083 [`Box`][62228], or an [array][62235] and unused.
3084 - [You can now use the `cfg` and `cfg_attr` attributes on
3085 generic parameters.][61547]
3086 - [You can now use enum variants through type alias.][61682] e.g. You can
3087 write the following:
3089 type MyOption = Option<u8>;
3091 fn increment_or_zero(x: MyOption) -> u8 {
3093 MyOption::Some(y) => y + 1,
3094 MyOption::None => 0,
3098 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3099 `const _: u32 = 5;`.
3100 - [You can now use `#[repr(align(X)]` on enums.][61229]
3101 - [The `?` Kleene macro operator is now available in the
3102 2015 edition.][60932]
3106 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3107 and `-C profile-use` flags.][61268] For more information on how to use profile
3108 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3109 - [The `rust-lldb` wrapper script should now work again.][61827]
3113 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3117 - [`BufReader::buffer`]
3118 - [`BufWriter::buffer`]
3119 - [`Cell::from_mut`]
3120 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3121 - [`DoubleEndedIterator::nth_back`]
3123 - [`Wrapping::reverse_bits`]
3124 - [`i128::reverse_bits`]
3125 - [`i16::reverse_bits`]
3126 - [`i32::reverse_bits`]
3127 - [`i64::reverse_bits`]
3128 - [`i8::reverse_bits`]
3129 - [`isize::reverse_bits`]
3130 - [`slice::copy_within`]
3131 - [`u128::reverse_bits`]
3132 - [`u16::reverse_bits`]
3133 - [`u32::reverse_bits`]
3134 - [`u64::reverse_bits`]
3135 - [`u8::reverse_bits`]
3136 - [`usize::reverse_bits`]
3140 - [`Cargo.lock` files are now included by default when publishing executable crates
3141 with executables.][cargo/7026]
3142 - [You can now specify `default-run="foo"` in `[package]` to specify the
3143 default executable to use for `cargo run`.][cargo/7056]
3150 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3151 Please transition your code to using the `..=` syntax for inclusive
3153 - [Using a trait object without the `dyn` will now warn by default.][61203]
3154 Please transition your code to use `dyn Trait` for trait objects instead.
3156 [62228]: https://github.com/rust-lang/rust/pull/62228/
3157 [62235]: https://github.com/rust-lang/rust/pull/62235/
3158 [61802]: https://github.com/rust-lang/rust/pull/61802/
3159 [61827]: https://github.com/rust-lang/rust/pull/61827/
3160 [61547]: https://github.com/rust-lang/rust/pull/61547/
3161 [61682]: https://github.com/rust-lang/rust/pull/61682/
3162 [61268]: https://github.com/rust-lang/rust/pull/61268/
3163 [61342]: https://github.com/rust-lang/rust/pull/61342/
3164 [61347]: https://github.com/rust-lang/rust/pull/61347/
3165 [61100]: https://github.com/rust-lang/rust/pull/61100/
3166 [61203]: https://github.com/rust-lang/rust/pull/61203/
3167 [61229]: https://github.com/rust-lang/rust/pull/61229/
3168 [60932]: https://github.com/rust-lang/rust/pull/60932/
3169 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3170 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3171 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3172 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3173 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3174 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3175 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3176 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3177 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
3178 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3179 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3180 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3181 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3182 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3183 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3184 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3185 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3186 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3187 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3188 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3189 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3190 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3191 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3192 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3195 Version 1.36.0 (2019-07-04)
3196 ==========================
3200 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3201 - [The order of traits in trait objects no longer affects the semantics of that
3202 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3203 `dyn fmt::Debug + Send`, where this was previously not the case.
3207 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3208 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3209 - [`mem::needs_drop` is now available as a const fn.][60364]
3210 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3211 - [`String` now implements `BorrowMut<str>`.][60404]
3212 - [`io::Cursor` now implements `Default`.][60234]
3213 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3214 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3215 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3216 environment has access to heap memory allocation.
3217 - [`String` now implements `From<&String>`.][59825]
3218 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3219 return a tuple of each argument when there is multiple arguments.
3220 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3225 - [`VecDeque::rotate_left`]
3226 - [`VecDeque::rotate_right`]
3227 - [`Iterator::copied`]
3229 - [`io::IoSliceMut`]
3230 - [`Read::read_vectored`]
3231 - [`Write::write_vectored`]
3232 - [`str::as_mut_ptr`]
3233 - [`mem::MaybeUninit`]
3234 - [`pointer::align_offset`]
3235 - [`future::Future`]
3237 - [`task::RawWaker`]
3238 - [`task::RawWakerVTable`]
3244 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3245 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3247 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3251 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3258 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3259 longer recommended, and will be deprecated in 1.39.0.
3261 [60318]: https://github.com/rust-lang/rust/pull/60318/
3262 [60364]: https://github.com/rust-lang/rust/pull/60364/
3263 [60370]: https://github.com/rust-lang/rust/pull/60370/
3264 [60404]: https://github.com/rust-lang/rust/pull/60404/
3265 [60234]: https://github.com/rust-lang/rust/pull/60234/
3266 [60244]: https://github.com/rust-lang/rust/pull/60244/
3267 [58623]: https://github.com/rust-lang/rust/pull/58623/
3268 [59648]: https://github.com/rust-lang/rust/pull/59648/
3269 [59675]: https://github.com/rust-lang/rust/pull/59675/
3270 [59825]: https://github.com/rust-lang/rust/pull/59825/
3271 [59826]: https://github.com/rust-lang/rust/pull/59826/
3272 [59445]: https://github.com/rust-lang/rust/pull/59445/
3273 [59114]: https://github.com/rust-lang/rust/pull/59114/
3274 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3275 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3276 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3277 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3278 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3279 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3280 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3281 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3282 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3283 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3284 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3285 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3286 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3287 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3288 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3289 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3290 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3291 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3292 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3293 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3296 Version 1.35.0 (2019-05-23)
3297 ==========================
3301 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3302 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3303 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3305 unsafe fn call_unsafe(func: unsafe fn()) {
3310 unsafe { call_unsafe(|| {}); }
3317 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3318 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3319 - [Added the `wasm32-unknown-wasi` target.][59464]
3324 - [`Thread` will now show its ID in `Debug` output.][59460]
3325 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3326 - [`alloc::System` now implements `Default`.][59451]
3327 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3329 - [`char::{ToLowercase, ToUppercase}` now
3330 implement `ExactSizeIterator`.][58778]
3331 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3332 - [Removed the `Read` trait bounds
3333 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3334 - [You can now call the `dbg!` macro without any parameters to print the file
3335 and line where it is called.][57847]
3336 - [In place ASCII case conversions are now up to 4× faster.][59283]
3337 e.g. `str::make_ascii_lowercase`
3338 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3345 - [`RefCell::replace_with`]
3346 - [`RefCell::map_split`]
3348 - [`Range::contains`]
3349 - [`RangeFrom::contains`]
3350 - [`RangeTo::contains`]
3351 - [`RangeInclusive::contains`]
3352 - [`RangeToInclusive::contains`]
3353 - [`Option::copied`]
3357 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3358 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3363 - [The Rust toolchain is now available natively for musl based distros.][58575]
3365 [59460]: https://github.com/rust-lang/rust/pull/59460/
3366 [59464]: https://github.com/rust-lang/rust/pull/59464/
3367 [59500]: https://github.com/rust-lang/rust/pull/59500/
3368 [59512]: https://github.com/rust-lang/rust/pull/59512/
3369 [59580]: https://github.com/rust-lang/rust/pull/59580/
3370 [59283]: https://github.com/rust-lang/rust/pull/59283/
3371 [59451]: https://github.com/rust-lang/rust/pull/59451/
3372 [59076]: https://github.com/rust-lang/rust/pull/59076/
3373 [58778]: https://github.com/rust-lang/rust/pull/58778/
3374 [58717]: https://github.com/rust-lang/rust/pull/58717/
3375 [58369]: https://github.com/rust-lang/rust/pull/58369/
3376 [58423]: https://github.com/rust-lang/rust/pull/58423/
3377 [58080]: https://github.com/rust-lang/rust/pull/58080/
3378 [57847]: https://github.com/rust-lang/rust/pull/57847/
3379 [58575]: https://github.com/rust-lang/rust/pull/58575
3380 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3381 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3382 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3383 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3384 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3385 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3386 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3387 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3388 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3389 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3390 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3391 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3393 Version 1.34.2 (2019-05-14)
3394 ===========================
3396 * [Destabilize the `Error::type_id` function due to a security
3397 vulnerability][60785] ([CVE-2019-12083])
3399 [60785]: https://github.com/rust-lang/rust/pull/60785
3400 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3402 Version 1.34.1 (2019-04-25)
3403 ===========================
3405 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3406 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3407 * [Fix Clippy panic when checking some macros][clippy/3805]
3409 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3410 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3411 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3413 Version 1.34.0 (2019-04-11)
3414 ==========================
3418 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3419 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3421 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3422 `#[attr{}]` procedural macros.][57367]
3423 - [You can now write `extern crate self as foo;`][57407] to import your
3424 crate's root into the extern prelude.
3429 - [You can now target `riscv64imac-unknown-none-elf` and
3430 `riscv64gc-unknown-none-elf`.][58406]
3431 - [You can now enable linker plugin LTO optimisations with
3432 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3433 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3435 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3440 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3441 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3442 the `Hash` trait to create an iterator.
3443 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3444 methods.][58421] Most notably you no longer require the `Ord` trait to create
3446 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3447 for all numeric types.][58044]
3448 - [Indexing a `str` is now generic over all types that
3449 implement `SliceIndex<str>`.][57604]
3450 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3451 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3452 produce a warning if their returning type is unused.
3453 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3454 `overflowing_pow` are now available for all numeric types.][57873] These are
3455 equivalent to methods such as `wrapping_add` for the `pow` operation.
3463 * [`Error::type_id`]
3464 * [`atomic::AtomicI16`]
3465 * [`atomic::AtomicI32`]
3466 * [`atomic::AtomicI64`]
3467 * [`atomic::AtomicI8`]
3468 * [`atomic::AtomicU16`]
3469 * [`atomic::AtomicU32`]
3470 * [`atomic::AtomicU64`]
3471 * [`atomic::AtomicU8`]
3472 * [`convert::Infallible`]
3473 * [`convert::TryFrom`]
3474 * [`convert::TryInto`]
3476 * [`iter::successors`]
3477 * [`num::NonZeroI128`]
3478 * [`num::NonZeroI16`]
3479 * [`num::NonZeroI32`]
3480 * [`num::NonZeroI64`]
3481 * [`num::NonZeroI8`]
3482 * [`num::NonZeroIsize`]
3483 * [`slice::sort_by_cached_key`]
3484 * [`str::escape_debug`]
3485 * [`str::escape_default`]
3486 * [`str::escape_unicode`]
3487 * [`str::split_ascii_whitespace`]
3490 * [`Instant::checked_add`]
3491 * [`Instant::checked_sub`]
3492 * [`SystemTime::checked_add`]
3493 * [`SystemTime::checked_sub`]
3497 - [You can now use alternative registries to crates.io.][cargo/6654]
3501 - [You can now use the `?` operator in your documentation tests without manually
3502 adding `fn main() -> Result<(), _> {}`.][56470]
3506 - [`Command::before_exec` is being replaced by the unsafe method
3507 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3508 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3509 can now use `const` functions in `static` variables.
3511 [58370]: https://github.com/rust-lang/rust/pull/58370/
3512 [58406]: https://github.com/rust-lang/rust/pull/58406/
3513 [58421]: https://github.com/rust-lang/rust/pull/58421/
3514 [58166]: https://github.com/rust-lang/rust/pull/58166/
3515 [58044]: https://github.com/rust-lang/rust/pull/58044/
3516 [58057]: https://github.com/rust-lang/rust/pull/58057/
3517 [58059]: https://github.com/rust-lang/rust/pull/58059/
3518 [57809]: https://github.com/rust-lang/rust/pull/57809/
3519 [57873]: https://github.com/rust-lang/rust/pull/57873/
3520 [57604]: https://github.com/rust-lang/rust/pull/57604/
3521 [57367]: https://github.com/rust-lang/rust/pull/57367/
3522 [57407]: https://github.com/rust-lang/rust/pull/57407/
3523 [57425]: https://github.com/rust-lang/rust/pull/57425/
3524 [57106]: https://github.com/rust-lang/rust/pull/57106/
3525 [56470]: https://github.com/rust-lang/rust/pull/56470/
3526 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3527 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3528 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3529 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3530 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3531 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3532 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3533 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3534 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3535 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3536 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3537 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3538 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3539 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3540 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3541 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3542 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3543 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3544 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3545 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3546 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3547 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3548 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3549 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3550 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3551 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3552 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3553 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3554 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3555 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3556 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3559 Version 1.33.0 (2019-02-28)
3560 ==========================
3564 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3565 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3566 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3567 E.g. You can have match statement on a `u8` that covers `0..=255` and
3568 you would no longer be required to have a `_ => unreachable!()` case.
3569 - [You can now have multiple patterns in `if let` and `while let`
3570 expressions.][57532] You can do this with the same syntax as a `match`
3580 let state = Creature::Crab("Ferris");
3582 if let Creature::Crab(name) | Creature::Person(name) = state {
3583 println!("This creature's name is: {}", name);
3587 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3588 this feature will by default produce a warning as this behaviour can be
3589 unintuitive. E.g. `if let _ = 5 {}`
3590 - [You can now use `let` bindings, assignments, expression statements,
3591 and irrefutable pattern destructuring in const functions.][57175]
3592 - [You can now call unsafe const functions.][57067] E.g.
3594 const unsafe fn foo() -> i32 { 5 }
3595 const fn bar() -> i32 {
3599 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3600 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3601 - [You can now specify a specific alignment with the `#[repr(packed)]`
3602 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3603 with an alignment of 2 bytes and a size of 6 bytes.
3604 - [You can now import an item from a module as an `_`.][56303] This allows you to
3605 import a trait's impls, and not have the name in the namespace. E.g.
3607 use std::io::Read as _;
3609 // Allowed as there is only one `Read` in the module.
3612 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3616 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3617 command line argument.][56351]
3618 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3619 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3620 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3621 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3622 information on Rust's platform support.
3623 - [Added support for the `thumbv7neon-linux-androideabi` and
3624 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3625 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3629 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3630 functions for all numeric types.][57566]
3631 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3632 are now `const` functions for all numeric types.][57105]
3633 - [The methods `is_positive` and `is_negative` are now `const` functions for
3634 all signed numeric types.][57105]
3635 - [The `get` method for all `NonZero` types is now `const`.][57167]
3636 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3637 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3638 numeric types.][57234]
3639 - [`Ipv4Addr::new` is now a `const` function][57234]
3643 - [`unix::FileExt::read_exact_at`]
3644 - [`unix::FileExt::write_all_at`]
3645 - [`Option::transpose`]
3646 - [`Result::transpose`]
3647 - [`convert::identity`]
3650 - [`marker::PhantomPinned`]
3651 - [`Vec::resize_with`]
3652 - [`VecDeque::resize_with`]
3653 - [`Duration::as_millis`]
3654 - [`Duration::as_micros`]
3655 - [`Duration::as_nanos`]
3660 - [You can now publish crates that require a feature flag to compile with
3661 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3662 - [Cargo should now rebuild a crate if a file was modified during the initial
3667 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3668 are now deprecated in the standard library, and their usage will now produce a warning.
3669 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3671 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3673 - [Libtest no longer creates a new thread for each test when
3674 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3676 [55982]: https://github.com/rust-lang/rust/pull/55982/
3677 [56243]: https://github.com/rust-lang/rust/pull/56243
3678 [56303]: https://github.com/rust-lang/rust/pull/56303/
3679 [56351]: https://github.com/rust-lang/rust/pull/56351/
3680 [56362]: https://github.com/rust-lang/rust/pull/56362
3681 [56642]: https://github.com/rust-lang/rust/pull/56642/
3682 [56769]: https://github.com/rust-lang/rust/pull/56769/
3683 [56805]: https://github.com/rust-lang/rust/pull/56805
3684 [56947]: https://github.com/rust-lang/rust/pull/56947/
3685 [57049]: https://github.com/rust-lang/rust/pull/57049/
3686 [57067]: https://github.com/rust-lang/rust/pull/57067/
3687 [57105]: https://github.com/rust-lang/rust/pull/57105
3688 [57130]: https://github.com/rust-lang/rust/pull/57130/
3689 [57167]: https://github.com/rust-lang/rust/pull/57167/
3690 [57175]: https://github.com/rust-lang/rust/pull/57175/
3691 [57234]: https://github.com/rust-lang/rust/pull/57234/
3692 [57332]: https://github.com/rust-lang/rust/pull/57332/
3693 [57465]: https://github.com/rust-lang/rust/pull/57465/
3694 [57532]: https://github.com/rust-lang/rust/pull/57532/
3695 [57535]: https://github.com/rust-lang/rust/pull/57535/
3696 [57566]: https://github.com/rust-lang/rust/pull/57566/
3697 [57615]: https://github.com/rust-lang/rust/pull/57615/
3698 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3699 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3700 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3701 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3702 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3703 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3704 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3705 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3706 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3707 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3708 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3709 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3710 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3711 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3712 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3713 [platform-support]: https://forge.rust-lang.org/platform-support.html
3715 Version 1.32.0 (2019-01-17)
3716 ==========================
3721 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3722 operator allows you to specify zero or one repetitions similar to the `*` and
3724 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3725 now always resolve to the item (`enum`, `struct`, etc.) available in the
3726 module if present, before resolving to a external crate or an item the prelude.][56759]
3729 enum Color { Red, Green, Blue }
3735 - [You can now match against `PhantomData<T>` types.][55837]
3736 - [You can now match against literals in macros with the `literal`
3737 specifier.][56072] This will match against a literal of any type.
3738 E.g. `1`, `'A'`, `"Hello World"`
3739 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3741 struct Point(i32, i32);
3744 pub fn new(x: i32, y: i32) -> Self {
3748 pub fn is_origin(&self) -> bool {
3756 - [Self can also now be used in type definitions.][56366] E.g.
3760 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3763 Cons(T, Box<Self>) // likewise here
3766 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3767 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3771 - [The default allocator has changed from jemalloc to the default allocator on
3772 your system.][55238] The compiler itself on Linux & macOS will still use
3773 jemalloc, but programs compiled with it will use the system allocator.
3774 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3778 - [`PathBuf` now implements `FromStr`.][55148]
3779 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3780 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3781 easily debug expressions in your rust program. E.g.
3784 let b = dbg!(a * 2) + 1;
3785 // ^-- prints: [src/main.rs:4] a * 2 = 4
3789 The following APIs are now `const` functions and can be used in a
3793 - [`UnsafeCell::get`]
3794 - [`char::is_ascii`]
3796 - [`ManuallyDrop::new`]
3797 - [`ManuallyDrop::into_inner`]
3798 - [`RangeInclusive::start`]
3799 - [`RangeInclusive::end`]
3800 - [`NonNull::as_ptr`]
3803 - [`Duration::as_secs`]
3804 - [`Duration::subsec_millis`]
3805 - [`Duration::subsec_micros`]
3806 - [`Duration::subsec_nanos`]
3808 - [`Ipv4Addr::is_unspecified`]
3810 - [`Ipv6Addr::octets`]
3814 - [`i8::to_be_bytes`]
3815 - [`i8::to_le_bytes`]
3816 - [`i8::to_ne_bytes`]
3817 - [`i8::from_be_bytes`]
3818 - [`i8::from_le_bytes`]
3819 - [`i8::from_ne_bytes`]
3820 - [`i16::to_be_bytes`]
3821 - [`i16::to_le_bytes`]
3822 - [`i16::to_ne_bytes`]
3823 - [`i16::from_be_bytes`]
3824 - [`i16::from_le_bytes`]
3825 - [`i16::from_ne_bytes`]
3826 - [`i32::to_be_bytes`]
3827 - [`i32::to_le_bytes`]
3828 - [`i32::to_ne_bytes`]
3829 - [`i32::from_be_bytes`]
3830 - [`i32::from_le_bytes`]
3831 - [`i32::from_ne_bytes`]
3832 - [`i64::to_be_bytes`]
3833 - [`i64::to_le_bytes`]
3834 - [`i64::to_ne_bytes`]
3835 - [`i64::from_be_bytes`]
3836 - [`i64::from_le_bytes`]
3837 - [`i64::from_ne_bytes`]
3838 - [`i128::to_be_bytes`]
3839 - [`i128::to_le_bytes`]
3840 - [`i128::to_ne_bytes`]
3841 - [`i128::from_be_bytes`]
3842 - [`i128::from_le_bytes`]
3843 - [`i128::from_ne_bytes`]
3844 - [`isize::to_be_bytes`]
3845 - [`isize::to_le_bytes`]
3846 - [`isize::to_ne_bytes`]
3847 - [`isize::from_be_bytes`]
3848 - [`isize::from_le_bytes`]
3849 - [`isize::from_ne_bytes`]
3850 - [`u8::to_be_bytes`]
3851 - [`u8::to_le_bytes`]
3852 - [`u8::to_ne_bytes`]
3853 - [`u8::from_be_bytes`]
3854 - [`u8::from_le_bytes`]
3855 - [`u8::from_ne_bytes`]
3856 - [`u16::to_be_bytes`]
3857 - [`u16::to_le_bytes`]
3858 - [`u16::to_ne_bytes`]
3859 - [`u16::from_be_bytes`]
3860 - [`u16::from_le_bytes`]
3861 - [`u16::from_ne_bytes`]
3862 - [`u32::to_be_bytes`]
3863 - [`u32::to_le_bytes`]
3864 - [`u32::to_ne_bytes`]
3865 - [`u32::from_be_bytes`]
3866 - [`u32::from_le_bytes`]
3867 - [`u32::from_ne_bytes`]
3868 - [`u64::to_be_bytes`]
3869 - [`u64::to_le_bytes`]
3870 - [`u64::to_ne_bytes`]
3871 - [`u64::from_be_bytes`]
3872 - [`u64::from_le_bytes`]
3873 - [`u64::from_ne_bytes`]
3874 - [`u128::to_be_bytes`]
3875 - [`u128::to_le_bytes`]
3876 - [`u128::to_ne_bytes`]
3877 - [`u128::from_be_bytes`]
3878 - [`u128::from_le_bytes`]
3879 - [`u128::from_ne_bytes`]
3880 - [`usize::to_be_bytes`]
3881 - [`usize::to_le_bytes`]
3882 - [`usize::to_ne_bytes`]
3883 - [`usize::from_be_bytes`]
3884 - [`usize::from_le_bytes`]
3885 - [`usize::from_ne_bytes`]
3889 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3890 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3894 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3898 - [The argument types for AVX's
3899 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3900 been changed from `*const` to `*mut` as the previous implementation
3904 [55148]: https://github.com/rust-lang/rust/pull/55148/
3905 [55238]: https://github.com/rust-lang/rust/pull/55238/
3906 [55280]: https://github.com/rust-lang/rust/pull/55280/
3907 [55610]: https://github.com/rust-lang/rust/pull/55610/
3908 [55663]: https://github.com/rust-lang/rust/pull/55663/
3909 [55702]: https://github.com/rust-lang/rust/pull/55702/
3910 [55837]: https://github.com/rust-lang/rust/pull/55837/
3911 [55843]: https://github.com/rust-lang/rust/pull/55843/
3912 [56072]: https://github.com/rust-lang/rust/pull/56072/
3913 [56245]: https://github.com/rust-lang/rust/pull/56245/
3914 [56365]: https://github.com/rust-lang/rust/pull/56365/
3915 [56366]: https://github.com/rust-lang/rust/pull/56366/
3916 [56395]: https://github.com/rust-lang/rust/pull/56395/
3917 [56759]: https://github.com/rust-lang/rust/pull/56759/
3918 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3919 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3920 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3921 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3922 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3923 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3924 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3925 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3926 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3927 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3928 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3929 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3930 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3931 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3932 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3933 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3934 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3935 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3936 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3937 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3938 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3939 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3940 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3941 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3942 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3943 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3944 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3945 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3946 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3947 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3948 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3949 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3950 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3951 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3952 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3953 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3954 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3955 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3956 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3957 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3958 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3959 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3960 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3961 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3962 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3963 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3964 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3965 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3966 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3967 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3968 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3969 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3970 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3971 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3972 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3973 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3974 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3975 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3976 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3977 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3978 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3979 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3980 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3981 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3982 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3983 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3984 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3985 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3986 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3987 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3988 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3989 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3990 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3991 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3992 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3993 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3994 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3995 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3996 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3997 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3998 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3999 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4000 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4001 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4002 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4003 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4004 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4005 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4006 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4007 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4008 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4009 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4010 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4013 Version 1.31.1 (2018-12-20)
4014 ===========================
4016 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4017 - [Fix broken go-to-definition in RLS][rls/1171]
4018 - [Fix infinite loop on hover in RLS][rls/1170]
4020 [56562]: https://github.com/rust-lang/rust/pull/56562
4021 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4022 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4024 Version 1.31.0 (2018-12-06)
4025 ==========================
4029 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4030 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4031 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4032 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4034 - [You can now define and use `const` functions.][54835] These are currently
4035 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4036 [language reference][const-reference] for what exactly is available.
4037 - [You can now use tool lints, which allow you to scope lints from external
4038 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4039 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4040 a crate, not just in exported functions.][54451]
4041 - [You can now use parentheses in pattern matches.][54497]
4045 - [Updated musl to 1.1.20][54430]
4049 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4050 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4051 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4052 into `Option<&mut T>` using the `From` trait.][53218]
4053 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4058 - [`slice::align_to`]
4059 - [`slice::align_to_mut`]
4060 - [`slice::chunks_exact`]
4061 - [`slice::chunks_exact_mut`]
4062 - [`slice::rchunks`]
4063 - [`slice::rchunks_mut`]
4064 - [`slice::rchunks_exact`]
4065 - [`slice::rchunks_exact_mut`]
4066 - [`Option::replace`]
4070 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4071 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4072 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4074 [52813]: https://github.com/rust-lang/rust/pull/52813/
4075 [53218]: https://github.com/rust-lang/rust/pull/53218/
4076 [53555]: https://github.com/rust-lang/rust/issues/53555/
4077 [54057]: https://github.com/rust-lang/rust/pull/54057/
4078 [54240]: https://github.com/rust-lang/rust/pull/54240/
4079 [54430]: https://github.com/rust-lang/rust/pull/54430/
4080 [54451]: https://github.com/rust-lang/rust/pull/54451/
4081 [54497]: https://github.com/rust-lang/rust/pull/54497/
4082 [54778]: https://github.com/rust-lang/rust/pull/54778/
4083 [54835]: https://github.com/rust-lang/rust/pull/54835/
4084 [54870]: https://github.com/rust-lang/rust/pull/54870/
4085 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4086 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4087 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4088 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4089 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4090 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4091 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4092 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4093 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4094 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4095 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4096 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4097 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4098 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4100 Version 1.30.1 (2018-11-08)
4101 ===========================
4103 - [Fixed overflow ICE in rustdoc][54199]
4104 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4106 [54199]: https://github.com/rust-lang/rust/pull/54199
4107 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4109 Version 1.30.0 (2018-10-25)
4110 ==========================
4114 - [Procedural macros are now available.][52081] These kinds of macros allow for
4115 more powerful code generation. There is a [new chapter available][proc-macros]
4116 in the Rust Programming Language book that goes further in depth.
4117 - [You can now use keywords as identifiers using the raw identifiers
4118 syntax (`r#`),][53236] e.g. `let r#for = true;`
4119 - [Using anonymous parameters in traits is now deprecated with a warning and
4120 will be a hard error in the 2018 edition.][53272]
4121 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4122 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4123 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4124 Previously, using a external crate in a module without a use statement
4125 required `let json = ::serde_json::from_str(foo);` but can now be written
4126 as `let json = serde_json::from_str(foo);`.
4127 - [You can now apply the `#[used]` attribute to static items to prevent the
4128 compiler from optimising them away, even if they appear to be unused,][51363]
4129 e.g. `#[used] static FOO: u32 = 1;`
4130 - [You can now import and reexport macros from other crates with the `use`
4131 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4132 the root module of the crate. If your macro relies on calling other local
4133 macros, it is recommended to export with the
4134 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4136 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4137 using the `vis` specifier.][53370]
4138 - [Non-macro attributes now allow all forms of literals, not just
4139 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4140 write `#[attr(true)]`.
4141 - [You can now specify a function to handle a panic in the Rust runtime with the
4142 `#[panic_handler]` attribute.][51366]
4146 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4147 - [Added the `aarch64-unknown-netbsd` target][53165]
4148 - [Upgraded to LLVM 8.][53611]
4152 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4156 - [`Ipv4Addr::BROADCAST`]
4157 - [`Ipv4Addr::LOCALHOST`]
4158 - [`Ipv4Addr::UNSPECIFIED`]
4159 - [`Ipv6Addr::LOCALHOST`]
4160 - [`Ipv6Addr::UNSPECIFIED`]
4161 - [`Iterator::find_map`]
4163 The following methods are replacement methods for `trim_left`, `trim_right`,
4164 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4166 - [`str::trim_end_matches`]
4168 - [`str::trim_start_matches`]
4169 - [`str::trim_start`]
4173 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4174 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4175 equivalent to calling `rustdoc --error-format=json`.
4176 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4180 - [`rustdoc` allows you to specify what edition to treat your code as with the
4181 `--edition` option.][54057]
4182 - [`rustdoc` now has the `--color` (specify whether to output color) and
4183 `--error-format` (specify error format, e.g. `json`) options.][53003]
4184 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4185 debug symbols.][53774]
4186 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4187 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4189 [50911]: https://github.com/rust-lang/rust/pull/50911/
4190 [51363]: https://github.com/rust-lang/rust/pull/51363/
4191 [51366]: https://github.com/rust-lang/rust/pull/51366/
4192 [52081]: https://github.com/rust-lang/rust/pull/52081/
4193 [53003]: https://github.com/rust-lang/rust/pull/53003/
4194 [53033]: https://github.com/rust-lang/rust/pull/53033/
4195 [53044]: https://github.com/rust-lang/rust/pull/53044/
4196 [53165]: https://github.com/rust-lang/rust/pull/53165/
4197 [53611]: https://github.com/rust-lang/rust/pull/53611/
4198 [53213]: https://github.com/rust-lang/rust/pull/53213/
4199 [53236]: https://github.com/rust-lang/rust/pull/53236/
4200 [53272]: https://github.com/rust-lang/rust/pull/53272/
4201 [53370]: https://github.com/rust-lang/rust/pull/53370/
4202 [53459]: https://github.com/rust-lang/rust/pull/53459/
4203 [53774]: https://github.com/rust-lang/rust/pull/53774/
4204 [53822]: https://github.com/rust-lang/rust/pull/53822/
4205 [54057]: https://github.com/rust-lang/rust/pull/54057/
4206 [54146]: https://github.com/rust-lang/rust/pull/54146/
4207 [54404]: https://github.com/rust-lang/rust/pull/54404/
4208 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4209 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4210 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4211 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4213 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4214 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4215 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4216 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4217 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4218 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4219 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4220 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4221 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4222 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4225 Version 1.29.2 (2018-10-11)
4226 ===========================
4228 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4229 - The `rls-preview` component on the windows-gnu targets has been restored.
4231 [54639]: https://github.com/rust-lang/rust/pull/54639
4234 Version 1.29.1 (2018-09-25)
4235 ===========================
4240 - The standard library's `str::repeat` function contained an out of bounds write
4241 caused by an integer overflow. This has been fixed by deterministically
4242 panicking when an overflow happens.
4244 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4248 Version 1.29.0 (2018-09-13)
4249 ==========================
4253 - [Bumped minimum LLVM version to 5.0.][51899]
4254 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4255 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4256 - [Upgraded to LLVM 7.][51966]
4260 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4261 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4262 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4263 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4265 - [`Cell<T>` now allows `T` to be unsized.][50494]
4266 - [`SocketAddr` is now stable on Redox.][52656]
4271 - [`Iterator::flatten`]
4276 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4277 `--locked` to disable this behavior.
4278 - [`cargo-install` will now allow you to cross compile an install
4279 using `--target`.][cargo/5614]
4280 - [Added the `cargo-fix` subcommand to automatically move project code from
4281 2015 edition to 2018.][cargo/5723]
4282 - [`cargo doc` can now optionally document private types using the
4283 `--document-private-items` flag.][cargo/5543]
4287 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4288 the specified level to that level.][52354] For example `--cap-lints warn`
4289 will demote `deny` and `forbid` lints to `warn`.
4290 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4291 fails and `101` if there is a panic.][52197]
4292 - [A preview of clippy has been made available through rustup.][51122]
4293 You can install the preview with `rustup component add clippy-preview`.
4297 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4298 Use `str::get_unchecked(begin..end)` instead.
4299 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4300 Consider using the `home_dir` function from
4301 https://crates.io/crates/dirs instead.
4302 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4303 - [`cfg` attributes and `--cfg` command line flags are now more
4304 strictly validated.][53893]
4306 [53893]: https://github.com/rust-lang/rust/pull/53893/
4307 [52861]: https://github.com/rust-lang/rust/pull/52861/
4308 [51966]: https://github.com/rust-lang/rust/pull/51966/
4309 [52656]: https://github.com/rust-lang/rust/pull/52656/
4310 [52239]: https://github.com/rust-lang/rust/pull/52239/
4311 [52330]: https://github.com/rust-lang/rust/pull/52330/
4312 [52354]: https://github.com/rust-lang/rust/pull/52354/
4313 [52402]: https://github.com/rust-lang/rust/pull/52402/
4314 [52103]: https://github.com/rust-lang/rust/pull/52103/
4315 [52197]: https://github.com/rust-lang/rust/pull/52197/
4316 [51807]: https://github.com/rust-lang/rust/pull/51807/
4317 [51899]: https://github.com/rust-lang/rust/pull/51899/
4318 [51912]: https://github.com/rust-lang/rust/pull/51912/
4319 [51511]: https://github.com/rust-lang/rust/pull/51511/
4320 [51619]: https://github.com/rust-lang/rust/pull/51619/
4321 [51656]: https://github.com/rust-lang/rust/pull/51656/
4322 [51178]: https://github.com/rust-lang/rust/pull/51178/
4323 [51122]: https://github.com/rust-lang/rust/pull/51122
4324 [50494]: https://github.com/rust-lang/rust/pull/50494/
4325 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4326 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4327 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4328 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4329 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4330 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4331 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4334 Version 1.28.0 (2018-08-02)
4335 ===========================
4339 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4340 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4341 the inner type across Foreign Function Interface (FFI) boundaries.
4342 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4343 and can now be used as identifiers.][51196]
4344 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4345 stable.][51241] This will allow users to specify a global allocator for
4347 - [Unit test functions marked with the `#[test]` attribute can now return
4348 `Result<(), E: Debug>` in addition to `()`.][51298]
4349 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4350 allows macros to easily target lifetimes.
4354 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4355 prioritise making smaller binary sizes. `z` is the same as `s` with the
4356 exception that it does not vectorise loops, which typically results in an even
4358 - [The short error format is now stable.][49546] Specified with
4359 `--error-format=short` this option will provide a more compressed output of
4360 rust error messages.
4361 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4362 - [Reduced the number of allocations in the macro parser.][50855] This can
4363 improve compile times of macro heavy crates on average by 5%.
4367 - [Implemented `Default` for `&mut str`.][51306]
4368 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4369 - [Implemented `Extend` for `()`.][50234]
4370 - [The `Debug` implementation of `time::Duration` should now be more easily
4371 human readable.][50364] Previously a `Duration` of one second would printed as
4372 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4373 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4374 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4375 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4376 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4377 for `PathBuf`.][50170]
4378 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4379 and `Wrapping<i128>`.][50465]
4380 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4381 possible.][51050] This can provide up to a 40% speed increase.
4382 - [Improved error messages when using `format!`.][50610]
4386 - [`Iterator::step_by`]
4387 - [`Path::ancestors`]
4388 - [`SystemTime::UNIX_EPOCH`]
4389 - [`alloc::GlobalAlloc`]
4391 - [`alloc::LayoutErr`]
4394 - [`alloc::alloc_zeroed`]
4395 - [`alloc::dealloc`]
4396 - [`alloc::realloc`]
4397 - [`alloc::handle_alloc_error`]
4398 - [`btree_map::Entry::or_default`]
4399 - [`fmt::Alignment`]
4400 - [`hash_map::Entry::or_default`]
4401 - [`iter::repeat_with`]
4402 - [`num::NonZeroUsize`]
4403 - [`num::NonZeroU128`]
4404 - [`num::NonZeroU16`]
4405 - [`num::NonZeroU32`]
4406 - [`num::NonZeroU64`]
4407 - [`num::NonZeroU8`]
4408 - [`ops::RangeBounds`]
4409 - [`slice::SliceIndex`]
4410 - [`slice::from_mut`]
4411 - [`slice::from_ref`]
4412 - [`{Any + Send + Sync}::downcast_mut`]
4413 - [`{Any + Send + Sync}::downcast_ref`]
4414 - [`{Any + Send + Sync}::is`]
4418 - [Cargo will now no longer allow you to publish crates with build scripts that
4419 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4420 considered to be immutable.
4424 - [The `suggestion_applicability` field in `rustc`'s json output is now
4425 stable.][50486] This will allow dev tools to check whether a code suggestion
4426 would apply to them.
4430 - [Rust will consider trait objects with duplicated constraints to be the same
4431 type as without the duplicated constraint.][51276] For example the below code will
4432 now fail to compile.
4437 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4440 impl Trait + Send + Send {
4441 fn test(&self) { println!("two"); }
4445 [49546]: https://github.com/rust-lang/rust/pull/49546/
4446 [50143]: https://github.com/rust-lang/rust/pull/50143/
4447 [50170]: https://github.com/rust-lang/rust/pull/50170/
4448 [50234]: https://github.com/rust-lang/rust/pull/50234/
4449 [50265]: https://github.com/rust-lang/rust/pull/50265/
4450 [50364]: https://github.com/rust-lang/rust/pull/50364/
4451 [50385]: https://github.com/rust-lang/rust/pull/50385/
4452 [50465]: https://github.com/rust-lang/rust/pull/50465/
4453 [50486]: https://github.com/rust-lang/rust/pull/50486/
4454 [50554]: https://github.com/rust-lang/rust/pull/50554/
4455 [50610]: https://github.com/rust-lang/rust/pull/50610/
4456 [50855]: https://github.com/rust-lang/rust/pull/50855/
4457 [51050]: https://github.com/rust-lang/rust/pull/51050/
4458 [51196]: https://github.com/rust-lang/rust/pull/51196/
4459 [51200]: https://github.com/rust-lang/rust/pull/51200/
4460 [51241]: https://github.com/rust-lang/rust/pull/51241/
4461 [51276]: https://github.com/rust-lang/rust/pull/51276/
4462 [51298]: https://github.com/rust-lang/rust/pull/51298/
4463 [51306]: https://github.com/rust-lang/rust/pull/51306/
4464 [51562]: https://github.com/rust-lang/rust/pull/51562/
4465 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4466 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4467 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4468 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4469 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4470 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4471 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4472 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4473 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4474 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4475 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4476 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4477 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4478 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4479 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4480 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4481 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4482 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4483 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4484 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4485 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4486 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4487 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4488 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4489 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4490 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4491 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4492 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4493 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4494 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4496 Version 1.27.2 (2018-07-20)
4497 ===========================
4502 - The borrow checker was fixed to avoid potential unsoundness when using
4503 match ergonomics: [#52213][52213].
4505 [52213]: https://github.com/rust-lang/rust/issues/52213
4507 Version 1.27.1 (2018-07-10)
4508 ===========================
4513 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4514 when running, which enabled executing code as some other user on a
4515 given machine. This release fixes that vulnerability; you can read
4516 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4518 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4523 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4524 match ergonomics: [#51415][51415], [#49534][49534].
4526 [51415]: https://github.com/rust-lang/rust/issues/51415
4527 [49534]: https://github.com/rust-lang/rust/issues/49534
4528 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4529 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4531 Version 1.27.0 (2018-06-21)
4532 ==========================
4536 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4537 be used as an identifier.
4538 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4539 bare `Trait` syntax, and should make it clearer when being used in tandem with
4540 `impl Trait` because it is equivalent to the following syntax:
4541 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4542 `Box<Trait> == Box<dyn Trait>`.
4543 - [Attributes on generic parameters such as types and lifetimes are
4544 now stable.][48851] e.g.
4545 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4546 - [The `#[must_use]` attribute can now also be used on functions as well as
4547 types.][48925] It provides a lint that by default warns users when the
4548 value returned by a function has not been used.
4552 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4556 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4557 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4558 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4559 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4560 the `cfg` attribute.
4561 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4562 std are now available in core.][49896]
4563 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4565 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4566 that the operation isn't done in place.
4567 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4568 the `#[must_use]` attribute][49533] to warn about unused potentially
4569 expensive allocations.
4573 - [`DoubleEndedIterator::rfind`]
4574 - [`DoubleEndedIterator::rfold`]
4575 - [`DoubleEndedIterator::try_rfold`]
4576 - [`Duration::from_micros`]
4577 - [`Duration::from_nanos`]
4578 - [`Duration::subsec_micros`]
4579 - [`Duration::subsec_millis`]
4580 - [`HashMap::remove_entry`]
4581 - [`Iterator::try_fold`]
4582 - [`Iterator::try_for_each`]
4584 - [`Option::filter`]
4585 - [`String::replace_range`]
4586 - [`Take::set_limit`]
4587 - [`hint::unreachable_unchecked`]
4588 - [`os::unix::process::parent_id`]
4589 - [`ptr::swap_nonoverlapping`]
4590 - [`slice::rsplit_mut`]
4592 - [`slice::swap_with_slice`]
4596 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4597 `readme`, and `repository` fields.][cargo/5386]
4598 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4599 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4600 a different directory than `target` for placing compilation artifacts.
4601 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4602 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4603 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4604 where cargo would infer a binary, Cargo will produce a warning. You can
4605 disable this feature ahead of time by setting any of the following to false:
4606 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4607 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4608 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4612 - [Added “The Rustc book” into the official documentation.][49707]
4613 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4614 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4618 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4619 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4620 compile, `"".is_empty()` will still compile.
4621 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4622 will only print the inner type.][48553] E.g.
4623 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4624 not `AtomicBool(true)`.
4625 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4626 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4627 alignment should cover all use cases.
4628 - The `.description()` method on the `std::error::Error` trait
4629 [has been soft-deprecated][50163]. It is no longer required to implement it.
4631 [48553]: https://github.com/rust-lang/rust/pull/48553/
4632 [48851]: https://github.com/rust-lang/rust/pull/48851/
4633 [48925]: https://github.com/rust-lang/rust/pull/48925/
4634 [49533]: https://github.com/rust-lang/rust/pull/49533/
4635 [49623]: https://github.com/rust-lang/rust/pull/49623/
4636 [49630]: https://github.com/rust-lang/rust/pull/49630/
4637 [49664]: https://github.com/rust-lang/rust/pull/49664/
4638 [49699]: https://github.com/rust-lang/rust/pull/49699/
4639 [49707]: https://github.com/rust-lang/rust/pull/49707/
4640 [49719]: https://github.com/rust-lang/rust/pull/49719/
4641 [49896]: https://github.com/rust-lang/rust/pull/49896/
4642 [49968]: https://github.com/rust-lang/rust/pull/49968/
4643 [50163]: https://github.com/rust-lang/rust/pull/50163
4644 [50177]: https://github.com/rust-lang/rust/pull/50177/
4645 [50378]: https://github.com/rust-lang/rust/pull/50378/
4646 [50398]: https://github.com/rust-lang/rust/pull/50398/
4647 [50423]: https://github.com/rust-lang/rust/pull/50423/
4648 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4649 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4650 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4651 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4652 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4653 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4654 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4655 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4656 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4657 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4658 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4659 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4660 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4661 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4662 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4663 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4664 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4665 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4666 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4667 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4668 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4669 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4670 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4671 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4672 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4673 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4674 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4675 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4676 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4677 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4680 Version 1.26.2 (2018-06-05)
4681 ==========================
4686 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4688 [51117]: https://github.com/rust-lang/rust/issues/51117
4691 Version 1.26.1 (2018-05-29)
4692 ==========================
4697 - [RLS now works on Windows.][50646]
4698 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4704 - [`fn main() -> impl Trait` no longer works for non-Termination
4706 This reverts an accidental stabilization.
4707 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4708 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4710 [50646]: https://github.com/rust-lang/rust/issues/50646
4711 [50656]: https://github.com/rust-lang/rust/pull/50656
4712 [50812]: https://github.com/rust-lang/rust/pull/50812
4713 [50950]: https://github.com/rust-lang/rust/issues/50950
4714 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4716 Version 1.26.0 (2018-05-10)
4717 ==========================
4721 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4722 implement either or both traits.][49299]
4723 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4724 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4725 lifetime can be elided.][49458]
4726 - [`impl Trait` is now stable allowing you to have abstract types in returns
4727 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4728 `fn open(path: impl AsRef<Path>)`.
4729 - [Pattern matching will now automatically apply dereferences.][49394]
4730 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4731 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4732 - [A lot of operations are now available in a const context.][46882] E.g. You
4733 can now index into constant arrays, reference and dereference into constants,
4734 and use tuple struct constructors.
4735 - [Fixed entry slice patterns are now stable.][48516] E.g.
4737 let points = [1, 2, 3, 4];
4739 [1, 2, 3, 4] => println!("All points were sequential."),
4740 _ => println!("Not all points were sequential."),
4747 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4748 - [Fixed exponential projection complexity on nested types.][48296]
4749 This can provide up to a ~12% reduction in compile times for certain crates.
4750 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4751 to remap path prefixes outputted by the compiler.
4752 - [Added `powerpc-unknown-netbsd` target.][48281]
4756 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4757 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4758 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4759 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4760 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4761 - [`ascii::escape_default` is now available in libcore.][48735]
4762 - [Trailing commas are now supported in std and core macros.][48056]
4763 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4764 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4769 - [`*const T::copy_to_nonoverlapping`]
4770 - [`*const T::copy_to`]
4771 - [`*const T::read_unaligned`]
4772 - [`*const T::read_volatile`]
4773 - [`*const T::read`]
4775 - [`*const T::wrapping_add`]
4776 - [`*const T::wrapping_sub`]
4778 - [`*mut T::copy_to_nonoverlapping`]
4779 - [`*mut T::copy_to`]
4780 - [`*mut T::read_unaligned`]
4781 - [`*mut T::read_volatile`]
4783 - [`*mut T::replace`]
4786 - [`*mut T::wrapping_add`]
4787 - [`*mut T::wrapping_sub`]
4788 - [`*mut T::write_bytes`]
4789 - [`*mut T::write_unaligned`]
4790 - [`*mut T::write_volatile`]
4793 - [`FromUtf8Error::as_bytes`]
4794 - [`LocalKey::try_with`]
4795 - [`Option::cloned`]
4796 - [`btree_map::Entry::and_modify`]
4797 - [`fs::read_to_string`]
4800 - [`hash_map::Entry::and_modify`]
4801 - [`iter::FusedIterator`]
4802 - [`ops::RangeInclusive`]
4803 - [`ops::RangeToInclusive`]
4805 - [`slice::rotate_left`]
4806 - [`slice::rotate_right`]
4807 - [`String::retain`]
4812 - [Cargo will now output path to custom commands when `-v` is
4813 passed with `--list`][cargo/5041]
4814 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4818 - [The second edition of "The Rust Programming Language" book is now recommended
4819 over the first.][48404]
4824 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4825 syntax is now invalid.
4827 use std::ops::Fn as dyn;
4828 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4830 - [The result of dereferences are no longer promoted to `'static`.][47408]
4834 const PAIR: &(i32, i32) = &(0, 1);
4835 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4838 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4839 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4841 - [Removed hoedown from rustdoc.][48274]
4842 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4844 [46882]: https://github.com/rust-lang/rust/pull/46882
4845 [47379]: https://github.com/rust-lang/rust/pull/47379
4846 [47408]: https://github.com/rust-lang/rust/pull/47408
4847 [47813]: https://github.com/rust-lang/rust/pull/47813
4848 [48056]: https://github.com/rust-lang/rust/pull/48056
4849 [48125]: https://github.com/rust-lang/rust/pull/48125
4850 [48166]: https://github.com/rust-lang/rust/pull/48166
4851 [48235]: https://github.com/rust-lang/rust/pull/48235
4852 [48274]: https://github.com/rust-lang/rust/pull/48274
4853 [48281]: https://github.com/rust-lang/rust/pull/48281
4854 [48296]: https://github.com/rust-lang/rust/pull/48296
4855 [48326]: https://github.com/rust-lang/rust/pull/48326
4856 [48359]: https://github.com/rust-lang/rust/pull/48359
4857 [48404]: https://github.com/rust-lang/rust/pull/48404
4858 [48481]: https://github.com/rust-lang/rust/pull/48481
4859 [48516]: https://github.com/rust-lang/rust/pull/48516
4860 [48628]: https://github.com/rust-lang/rust/pull/48628
4861 [48629]: https://github.com/rust-lang/rust/pull/48629
4862 [48657]: https://github.com/rust-lang/rust/pull/48657
4863 [48735]: https://github.com/rust-lang/rust/pull/48735
4864 [48978]: https://github.com/rust-lang/rust/pull/48978
4865 [49101]: https://github.com/rust-lang/rust/pull/49101
4866 [49109]: https://github.com/rust-lang/rust/pull/49109
4867 [49121]: https://github.com/rust-lang/rust/pull/49121
4868 [49162]: https://github.com/rust-lang/rust/pull/49162
4869 [49184]: https://github.com/rust-lang/rust/pull/49184
4870 [49234]: https://github.com/rust-lang/rust/pull/49234
4871 [49255]: https://github.com/rust-lang/rust/pull/49255
4872 [49299]: https://github.com/rust-lang/rust/pull/49299
4873 [49305]: https://github.com/rust-lang/rust/pull/49305
4874 [49394]: https://github.com/rust-lang/rust/pull/49394
4875 [49458]: https://github.com/rust-lang/rust/pull/49458
4876 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4877 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4878 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4879 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4880 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4881 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4882 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4883 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4884 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4885 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4886 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4887 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4888 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4889 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4890 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4891 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4892 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4893 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4894 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4895 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4896 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4897 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4898 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4899 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4900 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4901 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4902 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4903 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4904 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4905 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4906 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4907 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4908 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4909 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4910 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4911 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4912 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4913 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4914 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4915 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4916 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4917 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4920 Version 1.25.0 (2018-03-29)
4921 ==========================
4925 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4926 - [You can now use nested groups of imports.][47948]
4927 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4928 - [You can now have `|` at the start of a match arm.][47947] e.g.
4930 enum Foo { A, B, C }
4936 | Foo::B => println!("AB"),
4937 | Foo::C => println!("C"),
4944 - [Upgraded to LLVM 6.][47828]
4945 - [Added `-C lto=val` option.][47521]
4946 - [Added `i586-unknown-linux-musl` target][47282]
4950 - [Impl Send for `process::Command` on Unix.][47760]
4951 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4952 - [`UnsafeCell::into_inner` is now safe.][47204]
4953 - [Implement libstd for CloudABI.][47268]
4954 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4955 - [Implement `AsRef<Path>` for Component][46985]
4956 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4957 - [Moved `Duration` to libcore.][46666]
4961 - [`Location::column`]
4964 The following functions can now be used in a constant expression.
4965 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4966 - [`Duration::new`][47300]
4967 - [`Duration::from_secs`][47300]
4968 - [`Duration::from_millis`][47300]
4972 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4973 - [`cargo new` now defaults to creating a binary crate, instead of a
4974 library crate.][cargo/5029]
4978 - [Rust by example is now shipped with new releases][46196]
4982 - [Deprecated `net::lookup_host`.][47510]
4983 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4984 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4985 around indexing operations (see [#47349][47349]). This has been fixed (which also
4986 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4987 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4989 [33903]: https://github.com/rust-lang/rust/pull/33903
4990 [47947]: https://github.com/rust-lang/rust/pull/47947
4991 [47948]: https://github.com/rust-lang/rust/pull/47948
4992 [47760]: https://github.com/rust-lang/rust/pull/47760
4993 [47790]: https://github.com/rust-lang/rust/pull/47790
4994 [47828]: https://github.com/rust-lang/rust/pull/47828
4995 [47398]: https://github.com/rust-lang/rust/pull/47398
4996 [47510]: https://github.com/rust-lang/rust/pull/47510
4997 [47521]: https://github.com/rust-lang/rust/pull/47521
4998 [47204]: https://github.com/rust-lang/rust/pull/47204
4999 [47251]: https://github.com/rust-lang/rust/pull/47251
5000 [47268]: https://github.com/rust-lang/rust/pull/47268
5001 [47282]: https://github.com/rust-lang/rust/pull/47282
5002 [47300]: https://github.com/rust-lang/rust/pull/47300
5003 [47349]: https://github.com/rust-lang/rust/pull/47349
5004 [46931]: https://github.com/rust-lang/rust/pull/46931
5005 [46985]: https://github.com/rust-lang/rust/pull/46985
5006 [47006]: https://github.com/rust-lang/rust/pull/47006
5007 [46830]: https://github.com/rust-lang/rust/pull/46830
5008 [46095]: https://github.com/rust-lang/rust/pull/46095
5009 [46666]: https://github.com/rust-lang/rust/pull/46666
5010 [46196]: https://github.com/rust-lang/rust/pull/46196
5011 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5012 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5013 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5014 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5015 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5018 Version 1.24.1 (2018-03-01)
5019 ==========================
5021 - [Do not abort when unwinding through FFI][48251]
5022 - [Emit UTF-16 files for linker arguments on Windows][48318]
5023 - [Make the error index generator work again][48308]
5024 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5026 [48251]: https://github.com/rust-lang/rust/issues/48251
5027 [48308]: https://github.com/rust-lang/rust/issues/48308
5028 [48318]: https://github.com/rust-lang/rust/issues/48318
5029 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5032 Version 1.24.0 (2018-02-15)
5033 ==========================
5037 - [External `sysv64` ffi is now available.][46528]
5038 eg. `extern "sysv64" fn foo () {}`
5042 - [rustc now uses 16 codegen units by default for release builds.][46910]
5043 For the fastest builds, utilize `codegen-units=1`.
5044 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5045 - [Add `aarch64-unknown-openbsd` support][46760]
5049 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5050 improvement in performance in the majority of cases.
5051 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5052 with Windows.][46798]
5053 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5054 - [impl `From<bool>` for `AtomicBool`][46293]
5055 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5056 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5057 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5058 - [float::from_bits now just uses transmute.][46012] This provides
5059 some optimisations from LLVM.
5060 - [Copied `AsciiExt` methods onto `char`][46077]
5061 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5062 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5063 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5064 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5068 - [`RefCell::replace`]
5070 - [`atomic::spin_loop_hint`]
5072 The following functions can now be used in a constant expression.
5073 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5075 - [`AtomicBool::new`][46287]
5076 - [`AtomicUsize::new`][46287]
5077 - [`AtomicIsize::new`][46287]
5078 - [`AtomicPtr::new`][46287]
5079 - [`Cell::new`][46287]
5080 - [`{integer}::min_value`][46287]
5081 - [`{integer}::max_value`][46287]
5082 - [`mem::size_of`][46287]
5083 - [`mem::align_of`][46287]
5084 - [`ptr::null`][46287]
5085 - [`ptr::null_mut`][46287]
5086 - [`RefCell::new`][46287]
5087 - [`UnsafeCell::new`][46287]
5091 - [Added a `workspace.default-members` config that
5092 overrides implied `--all` in virtual workspaces.][cargo/4743]
5093 - [Enable incremental by default on development builds.][cargo/4817] Also added
5094 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5095 per-project or global basis respectively.
5102 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5103 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5104 in accordance with IETF RFC 4291 §2.2.
5105 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5106 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5107 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5108 - [Leading zeros in tuple struct members is now an error][47084]
5109 - [`column!()` macro is one-based instead of zero-based][46977]
5110 - [`fmt::Arguments` can no longer be shared across threads][45198]
5111 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5112 - [Cargo sets a different working directory for the compiler][cargo/4788]
5114 [44884]: https://github.com/rust-lang/rust/pull/44884
5115 [45198]: https://github.com/rust-lang/rust/pull/45198
5116 [45506]: https://github.com/rust-lang/rust/pull/45506
5117 [45904]: https://github.com/rust-lang/rust/pull/45904
5118 [45990]: https://github.com/rust-lang/rust/pull/45990
5119 [46012]: https://github.com/rust-lang/rust/pull/46012
5120 [46077]: https://github.com/rust-lang/rust/pull/46077
5121 [46094]: https://github.com/rust-lang/rust/pull/46094
5122 [46284]: https://github.com/rust-lang/rust/pull/46284
5123 [46287]: https://github.com/rust-lang/rust/pull/46287
5124 [46293]: https://github.com/rust-lang/rust/pull/46293
5125 [46528]: https://github.com/rust-lang/rust/pull/46528
5126 [46671]: https://github.com/rust-lang/rust/pull/46671
5127 [46713]: https://github.com/rust-lang/rust/pull/46713
5128 [46735]: https://github.com/rust-lang/rust/pull/46735
5129 [46749]: https://github.com/rust-lang/rust/pull/46749
5130 [46760]: https://github.com/rust-lang/rust/pull/46760
5131 [46798]: https://github.com/rust-lang/rust/pull/46798
5132 [46828]: https://github.com/rust-lang/rust/pull/46828
5133 [46831]: https://github.com/rust-lang/rust/pull/46831
5134 [46833]: https://github.com/rust-lang/rust/pull/46833
5135 [46910]: https://github.com/rust-lang/rust/pull/46910
5136 [46977]: https://github.com/rust-lang/rust/pull/46977
5137 [47018]: https://github.com/rust-lang/rust/pull/47018
5138 [47080]: https://github.com/rust-lang/rust/pull/47080
5139 [47084]: https://github.com/rust-lang/rust/pull/47084
5140 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5141 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5142 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5143 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5144 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5145 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5148 Version 1.23.0 (2018-01-04)
5149 ==========================
5153 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5154 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5155 Which should fix some confusing errors in some operations.
5159 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5160 undefined behavior.][45920]
5161 - [rustc now suggests renaming import if names clash.][45660]
5162 - [Display errors/warnings correctly when there are zero-width or
5163 wide characters.][45711]
5164 - [rustc now avoids unnecessary copies of arguments that are
5165 simple bindings][45380] This should improve memory usage on average by 5-10%.
5166 - [Updated musl used to build musl rustc to 1.1.17][45393]
5170 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5171 - [Implement Hash for raw pointers to unsized types][45483]
5172 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5173 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5174 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5175 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5176 and `<*mut T>::as_mut`][44932]
5177 - [Optimized `Thread::{park, unpark}` implementation][45524]
5178 - [Improved `SliceExt::binary_search` performance.][45333]
5179 - [impl `FromIterator<()>` for `()`][45379]
5180 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5188 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5189 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5190 - [Added unit test checking to `cargo check`][cargo/4592]
5191 - [Cargo now lets you install a specific version
5192 using `cargo install --version`][cargo/4637]
5196 - [Releases now ship with the Cargo book documentation.][45692]
5197 - [rustdoc now prints rendering warnings on every run.][45324]
5201 - [Changes have been made to type equality to make it more correct,
5202 in rare cases this could break some code.][45853] [Tracking issue for
5203 further information][45852]
5204 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5205 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5206 Android 9, the minimum supported version is Android 14.
5207 - [Bumped the minimum LLVM to 3.9][45326]
5209 [44042]: https://github.com/rust-lang/rust/pull/44042
5210 [44932]: https://github.com/rust-lang/rust/pull/44932
5211 [45267]: https://github.com/rust-lang/rust/pull/45267
5212 [45324]: https://github.com/rust-lang/rust/pull/45324
5213 [45326]: https://github.com/rust-lang/rust/pull/45326
5214 [45333]: https://github.com/rust-lang/rust/pull/45333
5215 [45379]: https://github.com/rust-lang/rust/pull/45379
5216 [45380]: https://github.com/rust-lang/rust/pull/45380
5217 [45393]: https://github.com/rust-lang/rust/pull/45393
5218 [45435]: https://github.com/rust-lang/rust/pull/45435
5219 [45483]: https://github.com/rust-lang/rust/pull/45483
5220 [45524]: https://github.com/rust-lang/rust/pull/45524
5221 [45571]: https://github.com/rust-lang/rust/pull/45571
5222 [45580]: https://github.com/rust-lang/rust/pull/45580
5223 [45610]: https://github.com/rust-lang/rust/pull/45610
5224 [45660]: https://github.com/rust-lang/rust/pull/45660
5225 [45692]: https://github.com/rust-lang/rust/pull/45692
5226 [45711]: https://github.com/rust-lang/rust/pull/45711
5227 [45772]: https://github.com/rust-lang/rust/pull/45772
5228 [45852]: https://github.com/rust-lang/rust/issues/45852
5229 [45853]: https://github.com/rust-lang/rust/pull/45853
5230 [45887]: https://github.com/rust-lang/rust/pull/45887
5231 [45920]: https://github.com/rust-lang/rust/pull/45920
5232 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5233 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5234 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5237 Version 1.22.1 (2017-11-22)
5238 ==========================
5240 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5242 [46183]: https://github.com/rust-lang/rust/pull/46183
5244 Version 1.22.0 (2017-11-22)
5245 ==========================
5249 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5250 - [Now accepts underscores in unicode escapes][43716]
5251 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5252 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5256 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5257 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5258 This should decrease compile times for debug builds.
5259 - [strict memory alignment now enabled on ARMv6][45094]
5260 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5264 - [Allow atomic operations up to 32 bits
5265 on `armv5te_unknown_linux_gnueabi`][44978]
5266 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5267 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5268 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5269 - [Properly detect overflow in `Instant += Duration`.][44220]
5270 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5271 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5272 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5279 - [Cargo will now build multi file examples in subdirectories of the `examples`
5280 folder that have a `main.rs` file.][cargo/4496]
5281 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5282 the old format will continue to work and can be updated with `cargo update`.
5283 - [Now supports vendoring git repositories][cargo/3992]
5287 - [`libbacktrace` is now available on Apple platforms.][44251]
5288 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5289 This now lets you specify that a given code example will fail to compile.
5293 - [The minimum Android version that rustc can build for has been bumped
5294 to `4.0` from `2.3`][45656]
5295 - [Allowing `T op= &T` for numeric types has broken some type
5296 inference cases][45480]
5299 [42526]: https://github.com/rust-lang/rust/pull/42526
5300 [43017]: https://github.com/rust-lang/rust/pull/43017
5301 [43716]: https://github.com/rust-lang/rust/pull/43716
5302 [43949]: https://github.com/rust-lang/rust/pull/43949
5303 [44015]: https://github.com/rust-lang/rust/pull/44015
5304 [44220]: https://github.com/rust-lang/rust/pull/44220
5305 [44251]: https://github.com/rust-lang/rust/pull/44251
5306 [44287]: https://github.com/rust-lang/rust/pull/44287
5307 [44303]: https://github.com/rust-lang/rust/pull/44303
5308 [44456]: https://github.com/rust-lang/rust/pull/44456
5309 [44466]: https://github.com/rust-lang/rust/pull/44466
5310 [44895]: https://github.com/rust-lang/rust/pull/44895
5311 [44966]: https://github.com/rust-lang/rust/pull/44966
5312 [44978]: https://github.com/rust-lang/rust/pull/44978
5313 [45041]: https://github.com/rust-lang/rust/pull/45041
5314 [45064]: https://github.com/rust-lang/rust/pull/45064
5315 [45075]: https://github.com/rust-lang/rust/pull/45075
5316 [45094]: https://github.com/rust-lang/rust/pull/45094
5317 [45095]: https://github.com/rust-lang/rust/pull/45095
5318 [45480]: https://github.com/rust-lang/rust/issues/45480
5319 [45656]: https://github.com/rust-lang/rust/pull/45656
5320 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5321 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5322 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5329 Version 1.21.0 (2017-10-12)
5330 ==========================
5334 - [You can now use static references for literals.][43838]
5338 let x: &'static u32 = &0;
5341 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5344 my_macro!(Vec<i32>::new); // Always worked
5345 my_macro!(Vec::<i32>::new); // Now works
5350 - [Upgraded jemalloc to 4.5.0][43911]
5351 - [Enabled unwinding panics on Redox][43917]
5352 - [Now runs LLVM in parallel during translation phase.][43506]
5353 This should reduce peak memory usage.
5357 - [Generate builtin impls for `Clone` for all arrays and tuples that
5358 are `T: Clone`][43690]
5359 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5360 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5361 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5366 [`std::mem::discriminant`]
5370 - [You can now call `cargo install` with multiple package names][cargo/4216]
5371 - [Cargo commands inside a virtual workspace will now implicitly
5372 pass `--all`][cargo/4335]
5373 - [Added a `[patch]` section to `Cargo.toml` to handle
5374 prepublication dependencies][cargo/4123] [RFC 1969]
5375 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5376 like patterns][cargo/4270]
5377 - [Added the `--all-targets` option][cargo/4400]
5378 - [Using required dependencies as a feature is now deprecated and emits
5379 a warning][cargo/4364]
5384 - [Cargo docs are moving][43916]
5385 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5386 - [The rustdoc book is now available][43863]
5387 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5388 - [Added a preview of RLS has been made available through rustup][44204]
5389 Install with `rustup component add rls-preview`
5390 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5391 Previously only showed `std::os::unix`.
5395 - [Changes in method matching against higher-ranked types][43880] This may cause
5396 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5397 - [rustc's JSON error output's byte position start at top of file.][42973]
5398 Was previously relative to the rustc's internal `CodeMap` struct which
5399 required the unstable library `libsyntax` to correctly use.
5400 - [`unused_results` lint no longer ignores booleans][43728]
5402 [42565]: https://github.com/rust-lang/rust/pull/42565
5403 [42973]: https://github.com/rust-lang/rust/pull/42973
5404 [43348]: https://github.com/rust-lang/rust/pull/43348
5405 [43459]: https://github.com/rust-lang/rust/pull/43459
5406 [43506]: https://github.com/rust-lang/rust/pull/43506
5407 [43540]: https://github.com/rust-lang/rust/pull/43540
5408 [43690]: https://github.com/rust-lang/rust/pull/43690
5409 [43728]: https://github.com/rust-lang/rust/pull/43728
5410 [43838]: https://github.com/rust-lang/rust/pull/43838
5411 [43863]: https://github.com/rust-lang/rust/pull/43863
5412 [43880]: https://github.com/rust-lang/rust/pull/43880
5413 [43911]: https://github.com/rust-lang/rust/pull/43911
5414 [43916]: https://github.com/rust-lang/rust/pull/43916
5415 [43917]: https://github.com/rust-lang/rust/pull/43917
5416 [44204]: https://github.com/rust-lang/rust/pull/44204
5417 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5418 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5419 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5420 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5421 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5422 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5423 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5424 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5425 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5427 Version 1.20.0 (2017-08-31)
5428 ===========================
5432 - [Associated constants are now stabilised.][42809]
5433 - [A lot of macro bugs are now fixed.][42913]
5438 - [Struct fields are now properly coerced to the expected field type.][42807]
5439 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5440 `wasm32-experimental-emscripten` target.
5441 - [Changed some of the error messages to be more helpful.][42033]
5442 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5444 - [rustc now reports the total number of errors on compilation failure][43015]
5445 previously this was only the number of errors in the pass that failed.
5446 - [Expansion in rustc has been sped up 29x.][42533]
5447 - [added `msp430-none-elf` target.][43099]
5448 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5450 - [Fixes backtraces on Redox][43228]
5451 - [rustc now identifies different versions of same crate when absolute paths of
5452 different types match in an error message.][42826]
5458 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5459 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5461 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5462 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5463 - [Impl `Clone` for `DefaultHasher`.][42799]
5464 - [Impl `Sync` for `SyncSender`.][42397]
5465 - [Impl `FromStr` for `char`][42271]
5466 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5468 - [allow messages in the `unimplemented!()` macro.][42155]
5469 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5470 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5471 - [Upgrade to Unicode 10.0.0][42999]
5472 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5473 - [Skip the main thread's manual stack guard on Linux][43072]
5474 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5475 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5477 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5482 - [`CStr::into_c_string`]
5483 - [`CString::as_c_str`]
5484 - [`CString::into_boxed_c_str`]
5485 - [`Chain::get_mut`]
5486 - [`Chain::get_ref`]
5487 - [`Chain::into_inner`]
5488 - [`Option::get_or_insert_with`]
5489 - [`Option::get_or_insert`]
5490 - [`OsStr::into_os_string`]
5491 - [`OsString::into_boxed_os_str`]
5494 - [`Utf8Error::error_len`]
5495 - [`char::EscapeDebug`]
5496 - [`char::escape_debug`]
5497 - [`compile_error!`]
5498 - [`f32::from_bits`]
5500 - [`f64::from_bits`]
5502 - [`mem::ManuallyDrop`]
5503 - [`slice::sort_unstable_by_key`]
5504 - [`slice::sort_unstable_by`]
5505 - [`slice::sort_unstable`]
5506 - [`str::from_boxed_utf8_unchecked`]
5507 - [`str::as_bytes_mut`]
5508 - [`str::as_bytes_mut`]
5509 - [`str::from_utf8_mut`]
5510 - [`str::from_utf8_unchecked_mut`]
5512 - [`str::get_unchecked_mut`]
5513 - [`str::get_unchecked`]
5515 - [`str::into_boxed_bytes`]
5520 - [Cargo API token location moved from `~/.cargo/config` to
5521 `~/.cargo/credentials`.][cargo/3978]
5522 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5523 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5524 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5525 - [You can now specify version of a binary when installed through
5526 `cargo install` using `--vers`.][cargo/4229]
5527 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5528 failure.][cargo/4248]
5529 - [Changed the convention around which file is the crate root.][cargo/4259]
5530 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5531 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5536 - [Functions with `'static` in their return types will now not be as usable as
5537 if they were using lifetime parameters instead.][42417]
5538 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5539 takes the sign of NaN into account where previously didn't.][42430]
5541 [42033]: https://github.com/rust-lang/rust/pull/42033
5542 [42155]: https://github.com/rust-lang/rust/pull/42155
5543 [42271]: https://github.com/rust-lang/rust/pull/42271
5544 [42397]: https://github.com/rust-lang/rust/pull/42397
5545 [42417]: https://github.com/rust-lang/rust/pull/42417
5546 [42430]: https://github.com/rust-lang/rust/pull/42430
5547 [42431]: https://github.com/rust-lang/rust/pull/42431
5548 [42533]: https://github.com/rust-lang/rust/pull/42533
5549 [42571]: https://github.com/rust-lang/rust/pull/42571
5550 [42613]: https://github.com/rust-lang/rust/pull/42613
5551 [42799]: https://github.com/rust-lang/rust/pull/42799
5552 [42807]: https://github.com/rust-lang/rust/pull/42807
5553 [42809]: https://github.com/rust-lang/rust/pull/42809
5554 [42822]: https://github.com/rust-lang/rust/pull/42822
5555 [42826]: https://github.com/rust-lang/rust/pull/42826
5556 [42854]: https://github.com/rust-lang/rust/pull/42854
5557 [42913]: https://github.com/rust-lang/rust/pull/42913
5558 [42999]: https://github.com/rust-lang/rust/pull/42999
5559 [43011]: https://github.com/rust-lang/rust/pull/43011
5560 [43015]: https://github.com/rust-lang/rust/pull/43015
5561 [43072]: https://github.com/rust-lang/rust/pull/43072
5562 [43077]: https://github.com/rust-lang/rust/pull/43077
5563 [43097]: https://github.com/rust-lang/rust/pull/43097
5564 [43099]: https://github.com/rust-lang/rust/pull/43099
5565 [43170]: https://github.com/rust-lang/rust/pull/43170
5566 [43178]: https://github.com/rust-lang/rust/pull/43178
5567 [43185]: https://github.com/rust-lang/rust/pull/43185
5568 [43228]: https://github.com/rust-lang/rust/pull/43228
5569 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5570 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5571 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5572 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5573 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5574 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5575 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5576 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5577 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5578 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5579 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5580 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5581 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5582 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5583 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5584 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5585 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5586 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5587 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5588 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5589 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5590 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5591 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5592 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5593 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5594 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5595 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5596 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5597 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5598 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5599 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5600 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5601 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5602 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5603 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5604 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5605 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5606 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5607 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5610 Version 1.19.0 (2017-07-20)
5611 ===========================
5616 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5617 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5618 - [Macro recursion limit increased to 1024 from 64.][41676]
5619 - [Added lint for detecting unused macros.][41907]
5620 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5621 For example: `let x = loop { break 7; };`
5622 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5623 contain `Copy` types and cannot have a `Drop` implementation.
5624 Example: `union Foo { bar: u8, baz: usize }`
5625 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5626 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5631 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5632 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5633 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5634 you should use `--target armv7-linux-androideabi`.
5635 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5636 - [Minor optimisation of string operations.][42037]
5637 - [Compiler error message is now `aborting due to previous error(s)` instead of
5638 `aborting due to N previous errors`][42150] This was previously inaccurate and
5639 would only count certain kinds of errors.
5640 - [The compiler now supports Visual Studio 2017][42225]
5641 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5642 - [Added a lot][42264] of [new error codes][42302]
5643 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5644 libraries with C Run-time Libraries(CRT) to be statically linked.
5645 - [Fixed various ARM codegen bugs][42740]
5650 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5651 `Extend<Cow<'a, str>>`][41449]
5652 - [`Vec` now implements `From<&mut [T]>`][41530]
5653 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5654 - [`SplitWhitespace` now implements `Clone`][41659]
5655 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5657 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5658 macros, but for printing to stderr.
5663 - [`OsString::shrink_to_fit`]
5666 - [`thread::ThreadId`]
5671 - [Build scripts can now add environment variables to the environment
5672 the crate is being compiled in.
5673 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5674 - [Subcommands now replace the current process rather than spawning a new
5675 child process][cargo/3970]
5676 - [Workspace members can now accept glob file patterns][cargo/3979]
5677 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5678 the members in a given workspace.][cargo/3988]
5679 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5680 - [Target directory path is now in the cargo metadata][cargo/4022]
5681 - [Cargo no longer checks out a local working directory for the
5682 crates.io index][cargo/4026] This should provide smaller file size for the
5683 registry, and improve cloning times, especially on Windows machines.
5684 - [Added an `--exclude` option for excluding certain packages when using the
5685 `--all` option][cargo/4031]
5686 - [Cargo will now automatically retry when receiving a 5xx error
5687 from crates.io][cargo/4032]
5688 - [The `--features` option now accepts multiple comma or space
5689 delimited values.][cargo/4084]
5690 - [Added support for custom target specific runners][cargo/3954]
5695 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5697 - [Rust will now release XZ compressed packages][rust-installer/57]
5698 - [rustup will now prefer to download rust packages with
5699 XZ compression][rustup/1100] over GZip packages.
5700 - [Added the ability to escape `#` in rust documentation][41785] By adding
5701 additional `#`'s ie. `##` is now `#`
5706 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5707 - [`-Z` flags are now no longer allowed to be used on the stable
5708 compiler.][41751] This has been a warning for a year previous to this.
5709 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5710 longer works][42844]. Users should migrate to the built-in `check`
5711 command, which has been available since 1.16.
5712 - [Ending a float literal with `._` is now a hard error.
5713 Example: `42._` .][41946]
5714 - [Any use of a private `extern crate` outside of its module is now a
5715 hard error.][36886] This was previously a warning.
5716 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5717 relative while the `::` prefix makes a path absolute, but was ignored and the
5718 path was relative regardless.
5719 - [Floating point constants in match patterns is now a hard error][36890]
5720 This was previously a warning.
5721 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5722 match patterns is now a hard error][36891] This was previously a warning.
5723 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5725 - [From the pound escape, lines consisting of multiple `#`s are
5727 - [It is an error to re-export private enum variants][42460]. This is
5728 known to break a number of crates that depend on an older version of
5730 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5731 to use it to find the linker, and the build will fail where it did
5732 not previously][42607]
5734 [36886]: https://github.com/rust-lang/rust/issues/36886
5735 [36888]: https://github.com/rust-lang/rust/issues/36888
5736 [36890]: https://github.com/rust-lang/rust/issues/36890
5737 [36891]: https://github.com/rust-lang/rust/issues/36891
5738 [36892]: https://github.com/rust-lang/rust/issues/36892
5739 [37406]: https://github.com/rust-lang/rust/issues/37406
5740 [39983]: https://github.com/rust-lang/rust/pull/39983
5741 [41145]: https://github.com/rust-lang/rust/pull/41145
5742 [41192]: https://github.com/rust-lang/rust/pull/41192
5743 [41258]: https://github.com/rust-lang/rust/pull/41258
5744 [41370]: https://github.com/rust-lang/rust/pull/41370
5745 [41449]: https://github.com/rust-lang/rust/pull/41449
5746 [41530]: https://github.com/rust-lang/rust/pull/41530
5747 [41624]: https://github.com/rust-lang/rust/pull/41624
5748 [41656]: https://github.com/rust-lang/rust/pull/41656
5749 [41659]: https://github.com/rust-lang/rust/pull/41659
5750 [41676]: https://github.com/rust-lang/rust/pull/41676
5751 [41751]: https://github.com/rust-lang/rust/pull/41751
5752 [41764]: https://github.com/rust-lang/rust/pull/41764
5753 [41785]: https://github.com/rust-lang/rust/pull/41785
5754 [41873]: https://github.com/rust-lang/rust/pull/41873
5755 [41907]: https://github.com/rust-lang/rust/pull/41907
5756 [41946]: https://github.com/rust-lang/rust/pull/41946
5757 [42016]: https://github.com/rust-lang/rust/pull/42016
5758 [42037]: https://github.com/rust-lang/rust/pull/42037
5759 [42068]: https://github.com/rust-lang/rust/pull/42068
5760 [42150]: https://github.com/rust-lang/rust/pull/42150
5761 [42162]: https://github.com/rust-lang/rust/pull/42162
5762 [42225]: https://github.com/rust-lang/rust/pull/42225
5763 [42264]: https://github.com/rust-lang/rust/pull/42264
5764 [42302]: https://github.com/rust-lang/rust/pull/42302
5765 [42460]: https://github.com/rust-lang/rust/issues/42460
5766 [42607]: https://github.com/rust-lang/rust/issues/42607
5767 [42740]: https://github.com/rust-lang/rust/pull/42740
5768 [42844]: https://github.com/rust-lang/rust/issues/42844
5769 [42948]: https://github.com/rust-lang/rust/pull/42948
5770 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5771 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5772 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5773 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5774 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5775 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5776 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5777 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5778 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5779 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5780 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5781 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5782 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5783 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5784 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5785 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5786 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5787 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5788 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5789 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5790 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5791 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5794 Version 1.18.0 (2017-06-08)
5795 ===========================
5800 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5801 make the item visible to just that module tree. Also accepts the keyword
5802 `crate` to make something public to the whole crate but not users of the
5803 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5804 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5805 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5806 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5807 types like `Write + Send`, trailing `+` are now supported in trait objects,
5808 and better error reporting for trait objects starting with `?Sized`.
5809 - [0e+10 is now a valid floating point literal][40589]
5810 - [Now warns if you bind a lifetime parameter to 'static][40734]
5811 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5812 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5813 representation in some cases.][40377]
5818 - [rustc can now emit mir with `--emit mir`][39891]
5819 - [Improved LLVM IR for trivial functions][40367]
5820 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5821 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5822 opportunities found through profiling
5823 - [Improved backtrace formatting when panicking][38165]
5828 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5829 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5830 iteration or reallocation.
5831 - [Simplified HashMap Bucket interface][40561] provides performance
5832 improvements for iterating and cloning.
5833 - [Specialize Vec::from_elem to use calloc][40409]
5834 - [Fixed Race condition in fs::create_dir_all][39799]
5835 - [No longer caching stdio on Windows][40516]
5836 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5837 2.50%~ faster and in one case now 12.50% faster.
5838 - [Optimized `AtomicBool::fetch_nand`][41143]
5843 - [`Child::try_wait`]
5844 - [`HashMap::retain`]
5845 - [`HashSet::retain`]
5847 - [`TcpStream::peek`]
5848 - [`UdpSocket::peek`]
5849 - [`UdpSocket::peek_from`]
5854 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5855 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5856 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5857 - [Added Android build support][cargo/3885]
5858 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5859 of a certain type, for example `cargo build --bins` will build all
5861 - [Added support for haiku][cargo/3952]
5866 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5867 - [Added rust-windbg script for better debugging on Windows][39983]
5868 - [Rust now uses the official cross compiler for NetBSD][40612]
5869 - [rustdoc now accepts `#` at the start of files][40828]
5870 - [Fixed jemalloc support for musl][41168]
5875 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5876 always placed after the sign if it exists and before the digits. With the `#`
5877 flag the zeroes are placed after the prefix and before the digits.
5878 - [Due to the struct field optimisation][40377], using `transmute` on structs
5879 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5880 always been undefined behavior, but is now more likely to break in practice.
5881 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5882 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5883 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5884 - [Overlapping inherent `impl`s are now a hard error][40728]
5885 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5886 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5887 `out.asm` and `out.ll` instead of only one of the filetypes.
5888 - [ calling a function that returns `Self` will no longer work][41805] when
5889 the size of `Self` cannot be statically determined.
5890 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5891 this has caused a few regressions namely:
5893 - Changed the link order of local static/dynamic libraries (respecting the
5894 order on given rather than having the compiler reorder).
5895 - Changed how MinGW is linked, native code linked to dynamic libraries
5896 may require manually linking to the gcc support library (for the native
5899 [38165]: https://github.com/rust-lang/rust/pull/38165
5900 [39799]: https://github.com/rust-lang/rust/pull/39799
5901 [39891]: https://github.com/rust-lang/rust/pull/39891
5902 [39983]: https://github.com/rust-lang/rust/pull/39983
5903 [40043]: https://github.com/rust-lang/rust/pull/40043
5904 [40241]: https://github.com/rust-lang/rust/pull/40241
5905 [40338]: https://github.com/rust-lang/rust/pull/40338
5906 [40367]: https://github.com/rust-lang/rust/pull/40367
5907 [40377]: https://github.com/rust-lang/rust/pull/40377
5908 [40409]: https://github.com/rust-lang/rust/pull/40409
5909 [40516]: https://github.com/rust-lang/rust/pull/40516
5910 [40556]: https://github.com/rust-lang/rust/pull/40556
5911 [40561]: https://github.com/rust-lang/rust/pull/40561
5912 [40589]: https://github.com/rust-lang/rust/pull/40589
5913 [40612]: https://github.com/rust-lang/rust/pull/40612
5914 [40723]: https://github.com/rust-lang/rust/pull/40723
5915 [40728]: https://github.com/rust-lang/rust/pull/40728
5916 [40731]: https://github.com/rust-lang/rust/pull/40731
5917 [40734]: https://github.com/rust-lang/rust/pull/40734
5918 [40805]: https://github.com/rust-lang/rust/pull/40805
5919 [40807]: https://github.com/rust-lang/rust/pull/40807
5920 [40828]: https://github.com/rust-lang/rust/pull/40828
5921 [40870]: https://github.com/rust-lang/rust/pull/40870
5922 [41085]: https://github.com/rust-lang/rust/pull/41085
5923 [41143]: https://github.com/rust-lang/rust/pull/41143
5924 [41168]: https://github.com/rust-lang/rust/pull/41168
5925 [41270]: https://github.com/rust-lang/rust/issues/41270
5926 [41469]: https://github.com/rust-lang/rust/pull/41469
5927 [41805]: https://github.com/rust-lang/rust/issues/41805
5928 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5929 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5930 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5931 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5932 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5933 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5934 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5935 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5936 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5937 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5938 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5939 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5940 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5941 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5944 Version 1.17.0 (2017-04-27)
5945 ===========================
5950 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5951 * [Fields of structs may be initialized without duplicating the field/variable
5952 names][39761]. [RFC 1682]
5953 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5954 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5955 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5956 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5957 `'b`. Soundness fix.
5958 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5959 * [Static variables may contain references to other statics][40027]
5964 * [Exit quickly on only `--emit dep-info`][40336]
5965 * [Make `-C relocation-model` more correctly determine whether the linker
5966 creates a position-independent executable][40245]
5967 * [Add `-C overflow-checks` to directly control whether integer overflow
5969 * [The rustc type checker now checks items on demand instead of in a single
5970 in-order pass][40008]. This is mostly an internal refactoring in support of
5971 future work, including incremental type checking, but also resolves [RFC
5972 1647], allowing `Self` to appear in `impl` `where` clauses.
5973 * [Optimize vtable loads][39995]
5974 * [Turn off vectorization for Emscripten targets][39990]
5975 * [Provide suggestions for unknown macros imported with `use`][39953]
5976 * [Fix ICEs in path resolution][39939]
5977 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5978 * [Add clearer error message using `&str + &str`][39116]
5989 * [`Ordering::then`]
5990 * [`Ordering::then_with`]
5991 * [`BTreeMap::range`]
5992 * [`BTreeMap::range_mut`]
5993 * [`collections::Bound`]
5994 * [`process::abort`]
5995 * [`ptr::read_unaligned`]
5996 * [`ptr::write_unaligned`]
5997 * [`Result::expect_err`]
6000 * [`Cell::into_inner`]
6006 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6007 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6008 * [`String` implements `FromIterator<&char>`][40028]
6009 * `Box` [implements][40009] a number of new conversions:
6010 `From<Box<str>> for String`,
6011 `From<Box<[T]>> for Vec<T>`,
6012 `From<Box<CStr>> for CString`,
6013 `From<Box<OsStr>> for OsString`,
6014 `From<Box<Path>> for PathBuf`,
6015 `Into<Box<str>> for String`,
6016 `Into<Box<[T]>> for Vec<T>`,
6017 `Into<Box<CStr>> for CString`,
6018 `Into<Box<OsStr>> for OsString`,
6019 `Into<Box<Path>> for PathBuf`,
6020 `Default for Box<str>`,
6021 `Default for Box<CStr>`,
6022 `Default for Box<OsStr>`,
6023 `From<&CStr> for Box<CStr>`,
6024 `From<&OsStr> for Box<OsStr>`,
6025 `From<&Path> for Box<Path>`
6026 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6027 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6028 * [Slightly optimize `slice::sort`][39538]
6029 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6030 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6031 `Box<str>` implements `From<&str>`][39438]
6032 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6033 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6034 * [`format!` estimates the needed capacity before writing a string][39356]
6035 * [Support unprivileged symlink creation in Windows][38921]
6036 * [`PathBuf` implements `Default`][38764]
6037 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6038 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6039 and poor hash functions.
6044 * [Add `cargo check --all`][cargo/3731]
6045 * [Add an option to ignore SSL revocation checking][cargo/3699]
6046 * [Add `cargo run --package`][cargo/3691]
6047 * [Add `required_features`][cargo/3667]
6048 * [Assume `build.rs` is a build script][cargo/3664]
6049 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6054 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6056 * [The "Unstable Book" documents nightly-only features][ubook]
6057 * [Improve the style of the sidebar in rustdoc output][40265]
6058 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6059 * [Fix MSP430 breakage due to `i128`][40257]
6060 * [Preliminary Solaris/SPARCv9 support][39903]
6061 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6062 run without installing the MSVC runtime.
6063 * [`rustdoc --test` includes file names in test names][39788]
6064 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6065 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6066 * [Initial support for `aarch64-unknown-freebsd`][39491]
6067 * [Initial support for `i686-unknown-netbsd`][39426]
6068 * [This release no longer includes the old makefile build system][39431]. Rust
6069 is built with a custom build system, written in Rust, and with Cargo.
6070 * [Add Debug implementations for libcollection structs][39002]
6071 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6072 * [`--test-threads=0` produces an error][38945]
6073 * [`rustup` installs documentation by default][40526]
6074 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6075 WinDbg and Visual Studio to improve the debugging experience.
6080 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6081 workaround, either use MSVC 2015 or run vcvars.bat.
6082 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6083 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6084 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6086 * [`format!` and `Display::to_string` panic if an underlying formatting
6087 implementation returns an error][40117]. Previously the error was silently
6088 ignored. It is incorrect for `write_fmt` to return an error when writing
6090 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6091 crates were marked stable and could be accessed from the stable toolchain.
6092 * [Rust git source no longer includes vendored crates][39728]. Those that need
6093 to build with vendored crates should build from release tarballs.
6094 * [Fix inert attributes from `proc_macro_derives`][39572]
6095 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6096 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6098 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6099 existing code generally ignores the type of dead-code unless a type-hint is
6100 provided; this can cause surprising inference interactions particularly around
6101 defaulting. The new code uniformly ignores the result type of dead-code.
6102 * [Tuple-struct constructors with private fields are no longer visible][38932]
6103 * [Lifetime parameters that do not appear in the arguments are now considered
6104 early-bound][38897], resolving a soundness bug (#[32330]). The
6105 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6107 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6108 * [Make transmuting from fn item types to pointer-sized types a hard
6111 [27787]: https://github.com/rust-lang/rust/issues/27787
6112 [32330]: https://github.com/rust-lang/rust/issues/32330
6113 [34198]: https://github.com/rust-lang/rust/pull/34198
6114 [38161]: https://github.com/rust-lang/rust/pull/38161
6115 [38368]: https://github.com/rust-lang/rust/pull/38368
6116 [38584]: https://github.com/rust-lang/rust/issues/38584
6117 [38661]: https://github.com/rust-lang/rust/pull/38661
6118 [38764]: https://github.com/rust-lang/rust/pull/38764
6119 [38864]: https://github.com/rust-lang/rust/issues/38864
6120 [38897]: https://github.com/rust-lang/rust/pull/38897
6121 [38921]: https://github.com/rust-lang/rust/pull/38921
6122 [38932]: https://github.com/rust-lang/rust/pull/38932
6123 [38945]: https://github.com/rust-lang/rust/pull/38945
6124 [38981]: https://github.com/rust-lang/rust/pull/38981
6125 [39002]: https://github.com/rust-lang/rust/pull/39002
6126 [39116]: https://github.com/rust-lang/rust/pull/39116
6127 [39193]: https://github.com/rust-lang/rust/pull/39193
6128 [39265]: https://github.com/rust-lang/rust/pull/39265
6129 [39356]: https://github.com/rust-lang/rust/pull/39356
6130 [39372]: https://github.com/rust-lang/rust/pull/39372
6131 [39426]: https://github.com/rust-lang/rust/pull/39426
6132 [39431]: https://github.com/rust-lang/rust/pull/39431
6133 [39438]: https://github.com/rust-lang/rust/pull/39438
6134 [39440]: https://github.com/rust-lang/rust/pull/39440
6135 [39485]: https://github.com/rust-lang/rust/pull/39485
6136 [39491]: https://github.com/rust-lang/rust/pull/39491
6137 [39518]: https://github.com/rust-lang/rust/pull/39518
6138 [39538]: https://github.com/rust-lang/rust/pull/39538
6139 [39572]: https://github.com/rust-lang/rust/pull/39572
6140 [39633]: https://github.com/rust-lang/rust/pull/39633
6141 [39642]: https://github.com/rust-lang/rust/pull/39642
6142 [39728]: https://github.com/rust-lang/rust/pull/39728
6143 [39761]: https://github.com/rust-lang/rust/pull/39761
6144 [39788]: https://github.com/rust-lang/rust/pull/39788
6145 [39793]: https://github.com/rust-lang/rust/pull/39793
6146 [39837]: https://github.com/rust-lang/rust/pull/39837
6147 [39843]: https://github.com/rust-lang/rust/pull/39843
6148 [39851]: https://github.com/rust-lang/rust/pull/39851
6149 [39903]: https://github.com/rust-lang/rust/pull/39903
6150 [39939]: https://github.com/rust-lang/rust/pull/39939
6151 [39953]: https://github.com/rust-lang/rust/pull/39953
6152 [39960]: https://github.com/rust-lang/rust/pull/39960
6153 [39990]: https://github.com/rust-lang/rust/pull/39990
6154 [39995]: https://github.com/rust-lang/rust/pull/39995
6155 [40008]: https://github.com/rust-lang/rust/pull/40008
6156 [40009]: https://github.com/rust-lang/rust/pull/40009
6157 [40027]: https://github.com/rust-lang/rust/pull/40027
6158 [40028]: https://github.com/rust-lang/rust/pull/40028
6159 [40037]: https://github.com/rust-lang/rust/pull/40037
6160 [40117]: https://github.com/rust-lang/rust/pull/40117
6161 [40166]: https://github.com/rust-lang/rust/pull/40166
6162 [40245]: https://github.com/rust-lang/rust/pull/40245
6163 [40257]: https://github.com/rust-lang/rust/pull/40257
6164 [40261]: https://github.com/rust-lang/rust/pull/40261
6165 [40265]: https://github.com/rust-lang/rust/pull/40265
6166 [40319]: https://github.com/rust-lang/rust/pull/40319
6167 [40336]: https://github.com/rust-lang/rust/pull/40336
6168 [40526]: https://github.com/rust-lang/rust/pull/40526
6169 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6170 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6171 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6172 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6173 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6174 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6175 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6176 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6177 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6178 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6179 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6180 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6181 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6182 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6183 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6184 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6185 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6186 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6187 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6188 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6189 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6190 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6191 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6192 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6193 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6194 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6195 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6196 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6197 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6198 [mdbook]: https://crates.io/crates/mdbook
6199 [ubook]: https://doc.rust-lang.org/unstable-book/
6202 Version 1.16.0 (2017-03-16)
6203 ===========================
6208 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6209 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6210 match patterns][38069]
6211 * [Clean up semantics of `self` in an import list][38313]
6212 * [`Self` may appear in `impl` headers][38920]
6213 * [`Self` may appear in struct expressions][39282]
6218 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6219 a `.rmeta` file containing only crate metadata][38571]. This can be
6220 used by tools like the Rust Language Service to perform
6221 metadata-only builds.
6222 * [Levenshtein based typo suggestions now work in most places, while
6223 previously they worked only for fields and sometimes for local
6224 variables][38927]. Together with the overhaul of "no
6225 resolution"/"unexpected resolution" errors (#[38154]) they result in
6226 large and systematic improvement in resolution diagnostics.
6227 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6229 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6230 * [`rustc` no longer attempts to provide "consider using an explicit
6231 lifetime" suggestions][37057]. They were inaccurate.
6236 * [`VecDeque::truncate`]
6237 * [`VecDeque::resize`]
6238 * [`String::insert_str`]
6239 * [`Duration::checked_add`]
6240 * [`Duration::checked_sub`]
6241 * [`Duration::checked_div`]
6242 * [`Duration::checked_mul`]
6245 * [`SocketAddr::is_ipv4`]
6246 * [`SocketAddr::is_ipv6`]
6247 * [`IpAddr::is_ipv4`]
6248 * [`IpAddr::is_ipv6`]
6250 * [`Vec::dedup_by_key`]
6251 * [`Result::unwrap_or_default`]
6252 * [`<*const T>::wrapping_offset`]
6253 * [`<*mut T>::wrapping_offset`]
6254 * `CommandExt::creation_flags`
6255 * [`File::set_permissions`]
6256 * [`String::split_off`]
6261 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6262 their argument by `Borrow` parameter][37761]
6263 * [All public types in std implement `Debug`][38006]
6264 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6265 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6266 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6268 * [std: Fix partial writes in `LineWriter`][38062]
6269 * [std: Clamp max read/write sizes on Unix][38062]
6270 * [Use more specific panic message for `&str` slicing errors][38066]
6271 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6272 functionality cannot be achieved in std currently.
6273 * [`writeln!`, like `println!`, now accepts a form with no string
6274 or formatting arguments, to just print a newline][38469]
6275 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6276 * [Reduce the size of static data in `std_unicode::tables`][38781]
6277 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6278 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6280 * [`Duration` implements `Sum`][38712]
6281 * [`String` implements `ToSocketAddrs`][39048]
6286 * [The `cargo check` command does a type check of a project without
6287 building it][cargo/3296]
6288 * [crates.io will display CI badges from Travis and AppVeyor, if
6289 specified in Cargo.toml][cargo/3546]
6290 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6291 * [Compilation profiles accept integer values for `debug`, in addition
6292 to `true` and `false`. These are passed to `rustc` as the value to
6293 `-C debuginfo`][cargo/3534]
6294 * [Implement `cargo --version --verbose`][cargo/3604]
6295 * [All builds now output 'dep-info' build dependencies compatible with
6296 make and ninja][cargo/3557]
6297 * [Build all workspace members with `build --all`][cargo/3511]
6298 * [Document all workspace members with `doc --all`][cargo/3515]
6299 * [Path deps outside workspace are not members][cargo/3443]
6304 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6305 the path to the Rust implementation][38589]
6306 * [The `armv7-linux-androideabi` target no longer enables NEON
6307 extensions, per Google's ABI guide][38413]
6308 * [The stock standard library can be compiled for Redox OS][38401]
6309 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6311 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6313 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6318 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6319 match patterns][38069]
6320 * In this release, references to uninhabited types can not be
6321 pattern-matched. This was accidentally allowed in 1.15.
6322 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6323 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6325 * [Clean up semantics of `self` in an import list][38313]
6326 * Reimplemented lifetime elision. This change was almost entirely compatible
6327 with existing code, but it did close a number of small bugs and loopholes,
6328 as well as being more accepting in some other [cases][41105].
6330 [37057]: https://github.com/rust-lang/rust/pull/37057
6331 [37761]: https://github.com/rust-lang/rust/pull/37761
6332 [38006]: https://github.com/rust-lang/rust/pull/38006
6333 [38051]: https://github.com/rust-lang/rust/pull/38051
6334 [38062]: https://github.com/rust-lang/rust/pull/38062
6335 [38062]: https://github.com/rust-lang/rust/pull/38622
6336 [38066]: https://github.com/rust-lang/rust/pull/38066
6337 [38069]: https://github.com/rust-lang/rust/pull/38069
6338 [38131]: https://github.com/rust-lang/rust/pull/38131
6339 [38154]: https://github.com/rust-lang/rust/pull/38154
6340 [38274]: https://github.com/rust-lang/rust/pull/38274
6341 [38304]: https://github.com/rust-lang/rust/pull/38304
6342 [38313]: https://github.com/rust-lang/rust/pull/38313
6343 [38314]: https://github.com/rust-lang/rust/pull/38314
6344 [38327]: https://github.com/rust-lang/rust/pull/38327
6345 [38401]: https://github.com/rust-lang/rust/pull/38401
6346 [38413]: https://github.com/rust-lang/rust/pull/38413
6347 [38469]: https://github.com/rust-lang/rust/pull/38469
6348 [38559]: https://github.com/rust-lang/rust/pull/38559
6349 [38571]: https://github.com/rust-lang/rust/pull/38571
6350 [38580]: https://github.com/rust-lang/rust/pull/38580
6351 [38589]: https://github.com/rust-lang/rust/pull/38589
6352 [38670]: https://github.com/rust-lang/rust/pull/38670
6353 [38712]: https://github.com/rust-lang/rust/pull/38712
6354 [38726]: https://github.com/rust-lang/rust/pull/38726
6355 [38781]: https://github.com/rust-lang/rust/pull/38781
6356 [38798]: https://github.com/rust-lang/rust/pull/38798
6357 [38909]: https://github.com/rust-lang/rust/pull/38909
6358 [38920]: https://github.com/rust-lang/rust/pull/38920
6359 [38927]: https://github.com/rust-lang/rust/pull/38927
6360 [39048]: https://github.com/rust-lang/rust/pull/39048
6361 [39282]: https://github.com/rust-lang/rust/pull/39282
6362 [39379]: https://github.com/rust-lang/rust/pull/39379
6363 [41105]: https://github.com/rust-lang/rust/issues/41105
6364 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6365 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6366 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6367 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6368 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6369 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6370 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6371 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6372 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6373 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6374 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6375 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6376 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6377 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6378 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6379 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6380 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6381 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6382 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6383 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6384 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6385 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6386 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6387 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6388 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6389 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6390 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6391 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6392 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6393 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6396 Version 1.15.1 (2017-02-09)
6397 ===========================
6399 * [Fix IntoIter::as_mut_slice's signature][39466]
6400 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6402 [39466]: https://github.com/rust-lang/rust/pull/39466
6403 [39523]: https://github.com/rust-lang/rust/pull/39523
6406 Version 1.15.0 (2017-02-02)
6407 ===========================
6412 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6413 stable. This allows popular code-generating crates like Serde and Diesel to
6414 work ergonomically. [RFC 1681].
6415 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6416 with curly braces][36868]. Part of [RFC 1506].
6417 * [A number of minor changes to name resolution have been activated][37127].
6418 They add up to more consistent semantics, allowing for future evolution of
6419 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6420 details of what is different. The breaking changes here have been transitioned
6421 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6422 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6424 * [`?Sized` can be used in `where` clauses][37791]
6425 * [There is now a limit on the size of monomorphized types and it can be
6426 modified with the `#![type_size_limit]` crate attribute, similarly to
6427 the `#![recursion_limit]` attribute][37789]
6432 * [On Windows, the compiler will apply dllimport attributes when linking to
6433 extern functions][37973]. Additional attributes and flags can control which
6434 library kind is linked and its name. [RFC 1717].
6435 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6436 * [The `--test` flag works with procedural macro crates][38107]
6437 * [Fix `extern "aapcs" fn` ABI][37814]
6438 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6439 * [The `format!` expander recognizes incorrect `printf` and shell-style
6440 formatting directives and suggests the correct format][37613].
6441 * [Only report one error for all unused imports in an import list][37456]
6443 Compiler Performance
6444 --------------------
6446 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6447 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6448 * [Don't clone in `UnificationTable::probe`][37848]
6449 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6450 * [Use small vectors in type walker][37760]
6451 * [Macro expansion performance was improved][37701]
6452 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6453 * [Replace FNV with a faster hash function][37229]
6458 * [`std::iter::Iterator::min_by`]
6459 * [`std::iter::Iterator::max_by`]
6460 * [`std::os::*::fs::FileExt`]
6461 * [`std::sync::atomic::Atomic*::get_mut`]
6462 * [`std::sync::atomic::Atomic*::into_inner`]
6463 * [`std::vec::IntoIter::as_slice`]
6464 * [`std::vec::IntoIter::as_mut_slice`]
6465 * [`std::sync::mpsc::Receiver::try_iter`]
6466 * [`std::os::unix::process::CommandExt::before_exec`]
6467 * [`std::rc::Rc::strong_count`]
6468 * [`std::rc::Rc::weak_count`]
6469 * [`std::sync::Arc::strong_count`]
6470 * [`std::sync::Arc::weak_count`]
6471 * [`std::char::encode_utf8`]
6472 * [`std::char::encode_utf16`]
6473 * [`std::cell::Ref::clone`]
6474 * [`std::io::Take::into_inner`]
6479 * [The standard sorting algorithm has been rewritten for dramatic performance
6480 improvements][38192]. It is a hybrid merge sort, drawing influences from
6481 Timsort. Previously it was a naive merge sort.
6482 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6483 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6485 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6486 and `char_indices().last()`][37882]
6487 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6488 * [Chinese characters display correctly in `fmt::Debug`][37855]
6489 * [Derive `Default` for `Duration`][37699]
6490 * [Support creation of anonymous pipes on WinXP/2k][37677]
6491 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6492 * [Don't pass overlapped handles to processes][38835]
6497 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6498 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6499 should instead check the variable at runtime with `std::env`. That the value
6500 was set at build time was a bug, and incorrect when cross-compiling. This
6501 change is known to cause breakage.
6502 * [Add `--all` flag to `cargo test`][cargo/3221]
6503 * [Compile statically against the MSVC CRT][cargo/3363]
6504 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6505 * [Link OpenSSL statically on OSX][cargo/3311]
6506 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6507 * [Test for bad path overrides with summaries][cargo/3336]
6508 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6509 * [Fix retrying crate downloads for network errors][cargo/3348]
6510 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6511 * [Emit more info on --message-format=json][cargo/3319]
6512 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6513 * [Don't ignore errors in workspace manifest][cargo/3409]
6514 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6519 * [Test runners (binaries built with `--test`) now support a `--list` argument
6520 that lists the tests it contains][38185]
6521 * [Test runners now support a `--exact` argument that makes the test filter
6522 match exactly, instead of matching only a substring of the test name][38181]
6523 * [rustdoc supports a `--playground-url` flag][37763]
6524 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6529 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6530 continue to be used in this release by passing `--disable-rustbuild` to the
6531 configure script, but they will be deleted soon. Note that the new build
6532 system uses a different on-disk layout that will likely affect any scripts
6534 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6536 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6537 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6543 * [A number of minor changes to name resolution have been activated][37127].
6544 They add up to more consistent semantics, allowing for future evolution of
6545 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6546 details of what is different. The breaking changes here have been transitioned
6547 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6548 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6549 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6550 should instead check the variable at runtime with `std::env`. That the value
6551 was set at build time was a bug, and incorrect when cross-compiling. This
6552 change is known to cause breakage.
6553 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6554 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6555 1.10 and is now an error by default. It will become a hard error in the near
6557 * [The semantics relating modules to file system directories are changing in
6558 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6559 lint, which is a warning in this release, and will become a hard error in the
6561 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6562 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6563 the underlying iterator][37834]
6565 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6566 [33685]: https://github.com/rust-lang/rust/issues/33685
6567 [36868]: https://github.com/rust-lang/rust/pull/36868
6568 [37127]: https://github.com/rust-lang/rust/pull/37127
6569 [37229]: https://github.com/rust-lang/rust/pull/37229
6570 [37456]: https://github.com/rust-lang/rust/pull/37456
6571 [37527]: https://github.com/rust-lang/rust/pull/37527
6572 [37602]: https://github.com/rust-lang/rust/pull/37602
6573 [37613]: https://github.com/rust-lang/rust/pull/37613
6574 [37615]: https://github.com/rust-lang/rust/pull/37615
6575 [37636]: https://github.com/rust-lang/rust/pull/37636
6576 [37627]: https://github.com/rust-lang/rust/pull/37627
6577 [37642]: https://github.com/rust-lang/rust/pull/37642
6578 [37677]: https://github.com/rust-lang/rust/pull/37677
6579 [37699]: https://github.com/rust-lang/rust/pull/37699
6580 [37701]: https://github.com/rust-lang/rust/pull/37701
6581 [37705]: https://github.com/rust-lang/rust/pull/37705
6582 [37749]: https://github.com/rust-lang/rust/pull/37749
6583 [37760]: https://github.com/rust-lang/rust/pull/37760
6584 [37763]: https://github.com/rust-lang/rust/pull/37763
6585 [37764]: https://github.com/rust-lang/rust/pull/37764
6586 [37789]: https://github.com/rust-lang/rust/pull/37789
6587 [37791]: https://github.com/rust-lang/rust/pull/37791
6588 [37814]: https://github.com/rust-lang/rust/pull/37814
6589 [37817]: https://github.com/rust-lang/rust/pull/37817
6590 [37834]: https://github.com/rust-lang/rust/pull/37834
6591 [37848]: https://github.com/rust-lang/rust/pull/37848
6592 [37855]: https://github.com/rust-lang/rust/pull/37855
6593 [37882]: https://github.com/rust-lang/rust/pull/37882
6594 [37888]: https://github.com/rust-lang/rust/pull/37888
6595 [37973]: https://github.com/rust-lang/rust/pull/37973
6596 [37979]: https://github.com/rust-lang/rust/pull/37979
6597 [38086]: https://github.com/rust-lang/rust/pull/38086
6598 [38107]: https://github.com/rust-lang/rust/pull/38107
6599 [38117]: https://github.com/rust-lang/rust/pull/38117
6600 [38134]: https://github.com/rust-lang/rust/pull/38134
6601 [38146]: https://github.com/rust-lang/rust/pull/38146
6602 [38181]: https://github.com/rust-lang/rust/pull/38181
6603 [38182]: https://github.com/rust-lang/rust/pull/38182
6604 [38185]: https://github.com/rust-lang/rust/pull/38185
6605 [38192]: https://github.com/rust-lang/rust/pull/38192
6606 [38279]: https://github.com/rust-lang/rust/pull/38279
6607 [38835]: https://github.com/rust-lang/rust/pull/38835
6608 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6609 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6610 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6611 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6612 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6613 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6614 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6615 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6616 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6617 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6618 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6619 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6620 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6621 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6622 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6623 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6624 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6625 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6626 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6627 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6628 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6629 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6630 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6631 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6632 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6633 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6634 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6635 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6636 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6637 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6638 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6639 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6640 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6641 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6642 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6643 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6644 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6645 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6648 Version 1.14.0 (2016-12-22)
6649 ===========================
6654 * [`..` matches multiple tuple fields in enum variants, structs
6655 and tuples][36843]. [RFC 1492].
6656 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6657 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6658 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6659 dereferencing][36822]
6664 * [Mark enums with non-zero discriminant as non-zero][37224]
6665 * [Lower-case `static mut` names are linted like other
6666 statics and consts][37162]
6667 * [Fix ICE on some macros in const integer positions
6668 (e.g. `[u8; m!()]`)][36819]
6669 * [Improve error message and snippet for "did you mean `x`"][36798]
6670 * [Add a panic-strategy field to the target specification][36794]
6671 * [Include LLVM version in `--version --verbose`][37200]
6673 Compile-time Optimizations
6674 --------------------------
6676 * [Improve macro expansion performance][37569]
6677 * [Shrink `Expr_::ExprInlineAsm`][37445]
6678 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6679 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6680 * [Avoid more allocations when compiling html5ever][37373]
6681 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6682 * [Avoid some allocations in the macro parser][37318]
6683 * [Use a faster deflate setting][37298]
6684 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6685 during interning of slices][37270]
6686 * [Optimize `write_metadata`][37267]
6687 * [Don't process obligation forest cycles when stalled][37231]
6688 * [Avoid many `CrateConfig` clones][37161]
6689 * [Optimize `Substs::super_fold_with`][37108]
6690 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6691 * [Speed up `plug_leaks`][36917]
6696 * [`println!()`, with no arguments, prints newline][36825].
6697 Previously, an empty string was required to achieve the same.
6698 * [`Wrapping` impls standard binary and unary operators, as well as
6699 the `Sum` and `Product` iterators][37356]
6700 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6702 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6703 `VecDeque` iterators][37315]
6704 * [Improve `SipHasher` performance on small values][37312]
6705 * [Add Iterator trait TrustedLen to enable better FromIterator /
6707 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6708 * [`ReadDir` implements `Debug`][37221]
6709 * [Implement `RefUnwindSafe` for atomic types][37178]
6710 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6711 * [Avoid allocations in `Decoder::read_str`][37064]
6712 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6713 * [Impl `Debug` for raw pointers to unsized data][36880]
6714 * [Don't reuse `HashMap` random seeds][37470]
6715 * [The internal memory layout of `HashMap` is more cache-friendly, for
6716 significant improvements in some operations][36692]
6717 * [`HashMap` uses less memory on 32-bit architectures][36595]
6718 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6723 * [Expose rustc cfg values to build scripts][cargo/3243]
6724 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6725 * [Fix passing --features when testing multiple packages][cargo/3280]
6726 * [Use a single profile set per workspace][cargo/3249]
6727 * [Load `replace` sections from lock files][cargo/3220]
6728 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6733 * [rustup is the recommended Rust installation method][1.14rustup]
6734 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6735 S390x. These are [tier 2] platforms and may have major defects. Follow the
6736 instructions on the website to install, or add the targets to an existing
6737 installation with `rustup target add`. The new target triples are:
6738 - `mips-unknown-linux-gnu`
6739 - `mipsel-unknown-linux-gnu`
6740 - `mips64-unknown-linux-gnuabi64`
6741 - `mips64el-unknown-linux-gnuabi64 `
6742 - `powerpc-unknown-linux-gnu`
6743 - `powerpc64-unknown-linux-gnu`
6744 - `powerpc64le-unknown-linux-gnu`
6745 - `s390x-unknown-linux-gnu `
6746 * This release includes target (std) builds for ARM Linux running MUSL
6747 libc. These are [tier 2] platforms and may have major defects. Add the
6748 following triples to an existing rustup installation with `rustup target add`:
6749 - `arm-unknown-linux-musleabi`
6750 - `arm-unknown-linux-musleabihf`
6751 - `armv7-unknown-linux-musleabihf`
6752 * This release includes [experimental support for WebAssembly][1.14wasm], via
6753 the `wasm32-unknown-emscripten` target. This target is known to have major
6754 defects. Please test, report, and fix.
6755 * rustup no longer installs documentation by default. Run `rustup
6756 component add rust-docs` to install.
6757 * [Fix line stepping in debugger][37310]
6758 * [Enable line number debuginfo in releases][37280]
6763 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6764 * [Add support for Fuchsia OS][37313]
6765 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6770 * [A number of forward-compatibility lints used by the compiler
6771 to gradually introduce language changes have been converted
6772 to deny by default][36894]:
6773 - ["use of inaccessible extern crate erroneously allowed"][36886]
6774 - ["type parameter default erroneously allowed in invalid location"][36887]
6775 - ["detects super or self keywords at the beginning of global path"][36888]
6776 - ["two overlapping inherent impls define an item with the same name
6777 were erroneously allowed"][36889]
6778 - ["floating-point constants cannot be used in patterns"][36890]
6779 - ["constants of struct or enum type can only be used in a pattern if
6780 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6781 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6782 * [Prohibit patterns in trait methods without bodies][37378]
6783 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6784 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6785 * [The `$crate` macro variable is accepted in fewer locations][37213]
6786 * [Impls specifying extra region requirements beyond the trait
6787 they implement are rejected][37167]
6788 * [Enums may not be unsized][37111]. Unsized enums are intended to
6789 work but never have. For now they are forbidden.
6790 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6792 [tier 2]: https://forge.rust-lang.org/platform-support.html
6793 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6794 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6795 [36430]: https://github.com/rust-lang/rust/pull/36430
6796 [36595]: https://github.com/rust-lang/rust/pull/36595
6797 [36595]: https://github.com/rust-lang/rust/pull/36595
6798 [36692]: https://github.com/rust-lang/rust/pull/36692
6799 [36767]: https://github.com/rust-lang/rust/pull/36767
6800 [36794]: https://github.com/rust-lang/rust/pull/36794
6801 [36798]: https://github.com/rust-lang/rust/pull/36798
6802 [36819]: https://github.com/rust-lang/rust/pull/36819
6803 [36822]: https://github.com/rust-lang/rust/pull/36822
6804 [36825]: https://github.com/rust-lang/rust/pull/36825
6805 [36843]: https://github.com/rust-lang/rust/pull/36843
6806 [36880]: https://github.com/rust-lang/rust/pull/36880
6807 [36886]: https://github.com/rust-lang/rust/issues/36886
6808 [36887]: https://github.com/rust-lang/rust/issues/36887
6809 [36888]: https://github.com/rust-lang/rust/issues/36888
6810 [36889]: https://github.com/rust-lang/rust/issues/36889
6811 [36890]: https://github.com/rust-lang/rust/issues/36890
6812 [36891]: https://github.com/rust-lang/rust/issues/36891
6813 [36892]: https://github.com/rust-lang/rust/issues/36892
6814 [36894]: https://github.com/rust-lang/rust/pull/36894
6815 [36917]: https://github.com/rust-lang/rust/pull/36917
6816 [36993]: https://github.com/rust-lang/rust/pull/36993
6817 [37037]: https://github.com/rust-lang/rust/pull/37037
6818 [37064]: https://github.com/rust-lang/rust/pull/37064
6819 [37094]: https://github.com/rust-lang/rust/pull/37094
6820 [37108]: https://github.com/rust-lang/rust/pull/37108
6821 [37111]: https://github.com/rust-lang/rust/pull/37111
6822 [37161]: https://github.com/rust-lang/rust/pull/37161
6823 [37162]: https://github.com/rust-lang/rust/pull/37162
6824 [37167]: https://github.com/rust-lang/rust/pull/37167
6825 [37178]: https://github.com/rust-lang/rust/pull/37178
6826 [37200]: https://github.com/rust-lang/rust/pull/37200
6827 [37213]: https://github.com/rust-lang/rust/pull/37213
6828 [37221]: https://github.com/rust-lang/rust/pull/37221
6829 [37224]: https://github.com/rust-lang/rust/pull/37224
6830 [37230]: https://github.com/rust-lang/rust/pull/37230
6831 [37231]: https://github.com/rust-lang/rust/pull/37231
6832 [37247]: https://github.com/rust-lang/rust/pull/37247
6833 [37267]: https://github.com/rust-lang/rust/pull/37267
6834 [37270]: https://github.com/rust-lang/rust/pull/37270
6835 [37273]: https://github.com/rust-lang/rust/pull/37273
6836 [37280]: https://github.com/rust-lang/rust/pull/37280
6837 [37298]: https://github.com/rust-lang/rust/pull/37298
6838 [37306]: https://github.com/rust-lang/rust/pull/37306
6839 [37310]: https://github.com/rust-lang/rust/pull/37310
6840 [37312]: https://github.com/rust-lang/rust/pull/37312
6841 [37313]: https://github.com/rust-lang/rust/pull/37313
6842 [37315]: https://github.com/rust-lang/rust/pull/37315
6843 [37318]: https://github.com/rust-lang/rust/pull/37318
6844 [37322]: https://github.com/rust-lang/rust/pull/37322
6845 [37326]: https://github.com/rust-lang/rust/pull/37326
6846 [37351]: https://github.com/rust-lang/rust/pull/37351
6847 [37356]: https://github.com/rust-lang/rust/pull/37356
6848 [37367]: https://github.com/rust-lang/rust/pull/37367
6849 [37373]: https://github.com/rust-lang/rust/pull/37373
6850 [37378]: https://github.com/rust-lang/rust/pull/37378
6851 [37389]: https://github.com/rust-lang/rust/pull/37389
6852 [37392]: https://github.com/rust-lang/rust/pull/37392
6853 [37427]: https://github.com/rust-lang/rust/pull/37427
6854 [37439]: https://github.com/rust-lang/rust/pull/37439
6855 [37445]: https://github.com/rust-lang/rust/pull/37445
6856 [37470]: https://github.com/rust-lang/rust/pull/37470
6857 [37569]: https://github.com/rust-lang/rust/pull/37569
6858 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6859 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6860 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6861 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6862 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6863 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6864 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6867 Version 1.13.0 (2016-11-10)
6868 ===========================
6873 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6874 errors, like the `try!` macro, described in [RFC 0243].
6875 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6876 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6877 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6878 * [Fix lifetime rules for 'if' conditions][36029]
6879 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6884 * [Add the `-C link-arg` argument][36574]
6885 * [Remove the old AST-based backend from rustc_trans][35764]
6886 * [Don't enable NEON by default on armv7 Linux][35814]
6887 * [Fix debug line number info for macro expansions][35238]
6888 * [Do not emit "class method" debuginfo for types that are not
6889 DICompositeType][36008]
6890 * [Warn about multiple conflicting #[repr] hints][34623]
6891 * [When sizing DST, don't double-count nested struct prefixes][36351]
6892 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6893 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6894 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6895 * [Expand macros without recursing to avoid stack overflows][36214]
6900 * [Replace macro backtraces with labeled local uses][35702]
6901 * [Improve error message for misplaced doc comments][33922]
6902 * [Buffer unix and lock windows to prevent message interleaving][35975]
6903 * [Update lifetime errors to specifically note temporaries][36171]
6904 * [Special case a few colors for Windows][36178]
6905 * [Suggest `use self` when such an import resolves][36289]
6906 * [Be more specific when type parameter shadows primitive type][36338]
6907 * Many minor improvements
6909 Compile-time Optimizations
6910 --------------------------
6912 * [Compute and cache HIR hashes at beginning][35854]
6913 * [Don't hash types in loan paths][36004]
6914 * [Cache projections in trans][35761]
6915 * [Optimize the parser's last token handling][36527]
6916 * [Only instantiate #[inline] functions in codegen units referencing
6917 them][36524]. This leads to big improvements in cases where crates export
6918 define many inline functions without using them directly.
6919 * [Lazily allocate TypedArena's first chunk][36592]
6920 * [Don't allocate during default HashSet creation][36734]
6927 * [`overflowing_abs`]
6928 * [`RefCell::try_borrow`]
6929 * [`RefCell::try_borrow_mut`]
6934 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6935 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6937 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6938 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6939 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6940 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6941 * [Use arc4rand on FreeBSD][35884]
6942 * [memrchr: Correct aligned offset computation][35969]
6943 * [Improve Demangling of Rust Symbols][36059]
6944 * [Use monotonic time in condition variables][35048]
6945 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6946 * [Implement conversion traits for `char`][35755]
6947 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6948 * [Zero first byte of CString on drop][36264]
6949 * [Inherit overflow checks for sum and product][36372]
6950 * [Add missing Eq implementations][36423]
6951 * [Implement `Debug` for `DirEntry`][36631]
6952 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6954 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6955 * [Implement more traits for `std::io::ErrorKind`][35911]
6956 * [Optimize BinaryHeap bounds checking][36072]
6957 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6958 `extend_with_element`][36355]
6959 * [Fix overflow checking in unsigned pow()][34942]
6964 * This release includes security fixes to both curl and OpenSSL.
6965 * [Fix transitive doctests when panic=abort][cargo/3021]
6966 * [Add --all-features flag to cargo][cargo/3038]
6967 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6968 * [Don't parse the home directory more than once][cargo/3078]
6969 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6970 * [Update OpenSSL to 1.0.2j][cargo/3121]
6971 * [Add license and license_file to cargo metadata output][cargo/3110]
6972 * [Make crates-io registry URL optional in config; ignore all changes to
6973 source.crates-io][cargo/3089]
6974 * [Don't download dependencies from other platforms][cargo/3123]
6975 * [Build transitive dev-dependencies when needed][cargo/3125]
6976 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6977 * [Avoid updating registry when adding existing deps][cargo/3144]
6978 * [Warn about path overrides that won't work][cargo/3136]
6979 * [Use workspaces during `cargo install`][cargo/3146]
6980 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6981 * [Add --message-format flag][cargo/3000]
6982 * [Pass target environment for rustdoc][cargo/3205]
6983 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6984 * [Update curl and curl-sys][cargo/3241]
6985 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6990 * [rustdoc: Add the `--sysroot` argument][36586]
6991 * [rustdoc: Fix a couple of issues with the search results][35655]
6992 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6993 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6994 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6999 * [Remove unmaintained style guide][35124]
7000 * [Add s390x support][36369]
7001 * [Initial work at Haiku OS support][36727]
7002 * [Add mips-uclibc targets][35734]
7003 * [Crate-ify compiler-rt into compiler-builtins][35021]
7004 * [Add rustc version info (git hash + date) to dist tarball][36213]
7005 * Many documentation improvements
7010 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7011 * [Deny (by default) transmuting from fn item types to pointer-sized
7012 types][34923]. Continuing the long transition to zero-sized fn items,
7014 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7016 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7017 * [Fix lifetime rules for 'if' conditions][36029].
7018 * [Inherit overflow checks for sum and product][36372].
7019 * [Forbid user-defined macros named "macro_rules"][36730].
7021 [33922]: https://github.com/rust-lang/rust/pull/33922
7022 [34623]: https://github.com/rust-lang/rust/pull/34623
7023 [34923]: https://github.com/rust-lang/rust/pull/34923
7024 [34942]: https://github.com/rust-lang/rust/pull/34942
7025 [34982]: https://github.com/rust-lang/rust/pull/34982
7026 [35021]: https://github.com/rust-lang/rust/pull/35021
7027 [35048]: https://github.com/rust-lang/rust/pull/35048
7028 [35074]: https://github.com/rust-lang/rust/pull/35074
7029 [35124]: https://github.com/rust-lang/rust/pull/35124
7030 [35234]: https://github.com/rust-lang/rust/pull/35234
7031 [35238]: https://github.com/rust-lang/rust/pull/35238
7032 [35354]: https://github.com/rust-lang/rust/pull/35354
7033 [35559]: https://github.com/rust-lang/rust/pull/35559
7034 [35585]: https://github.com/rust-lang/rust/pull/35585
7035 [35627]: https://github.com/rust-lang/rust/pull/35627
7036 [35655]: https://github.com/rust-lang/rust/pull/35655
7037 [35702]: https://github.com/rust-lang/rust/pull/35702
7038 [35707]: https://github.com/rust-lang/rust/pull/35707
7039 [35728]: https://github.com/rust-lang/rust/pull/35728
7040 [35734]: https://github.com/rust-lang/rust/pull/35734
7041 [35755]: https://github.com/rust-lang/rust/pull/35755
7042 [35761]: https://github.com/rust-lang/rust/pull/35761
7043 [35764]: https://github.com/rust-lang/rust/pull/35764
7044 [35814]: https://github.com/rust-lang/rust/pull/35814
7045 [35854]: https://github.com/rust-lang/rust/pull/35854
7046 [35871]: https://github.com/rust-lang/rust/pull/35871
7047 [35884]: https://github.com/rust-lang/rust/pull/35884
7048 [35911]: https://github.com/rust-lang/rust/pull/35911
7049 [35969]: https://github.com/rust-lang/rust/pull/35969
7050 [35975]: https://github.com/rust-lang/rust/pull/35975
7051 [36004]: https://github.com/rust-lang/rust/pull/36004
7052 [36008]: https://github.com/rust-lang/rust/pull/36008
7053 [36014]: https://github.com/rust-lang/rust/pull/36014
7054 [36029]: https://github.com/rust-lang/rust/pull/36029
7055 [36059]: https://github.com/rust-lang/rust/pull/36059
7056 [36072]: https://github.com/rust-lang/rust/pull/36072
7057 [36101]: https://github.com/rust-lang/rust/pull/36101
7058 [36104]: https://github.com/rust-lang/rust/pull/36104
7059 [36171]: https://github.com/rust-lang/rust/pull/36171
7060 [36173]: https://github.com/rust-lang/rust/pull/36173
7061 [36178]: https://github.com/rust-lang/rust/pull/36178
7062 [36213]: https://github.com/rust-lang/rust/pull/36213
7063 [36214]: https://github.com/rust-lang/rust/pull/36214
7064 [36264]: https://github.com/rust-lang/rust/pull/36264
7065 [36266]: https://github.com/rust-lang/rust/pull/36266
7066 [36289]: https://github.com/rust-lang/rust/pull/36289
7067 [36338]: https://github.com/rust-lang/rust/pull/36338
7068 [36351]: https://github.com/rust-lang/rust/pull/36351
7069 [36355]: https://github.com/rust-lang/rust/pull/36355
7070 [36369]: https://github.com/rust-lang/rust/pull/36369
7071 [36372]: https://github.com/rust-lang/rust/pull/36372
7072 [36423]: https://github.com/rust-lang/rust/pull/36423
7073 [36482]: https://github.com/rust-lang/rust/pull/36482
7074 [36505]: https://github.com/rust-lang/rust/pull/36505
7075 [36524]: https://github.com/rust-lang/rust/pull/36524
7076 [36527]: https://github.com/rust-lang/rust/pull/36527
7077 [36551]: https://github.com/rust-lang/rust/pull/36551
7078 [36574]: https://github.com/rust-lang/rust/pull/36574
7079 [36586]: https://github.com/rust-lang/rust/pull/36586
7080 [36592]: https://github.com/rust-lang/rust/pull/36592
7081 [36631]: https://github.com/rust-lang/rust/pull/36631
7082 [36639]: https://github.com/rust-lang/rust/pull/36639
7083 [36721]: https://github.com/rust-lang/rust/pull/36721
7084 [36727]: https://github.com/rust-lang/rust/pull/36727
7085 [36730]: https://github.com/rust-lang/rust/pull/36730
7086 [36734]: https://github.com/rust-lang/rust/pull/36734
7087 [36754]: https://github.com/rust-lang/rust/pull/36754
7088 [36995]: https://github.com/rust-lang/rust/pull/36995
7089 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7090 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7091 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7092 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7093 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7094 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7095 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7096 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7097 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7098 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7099 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7100 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7101 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7102 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7103 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7104 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7105 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7106 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7107 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7108 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7109 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7110 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7111 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7112 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7113 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7114 [rustup]: https://www.rustup.rs
7115 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7116 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7117 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7118 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7119 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7120 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7121 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7124 Version 1.12.1 (2016-10-20)
7125 ===========================
7130 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7131 * [Confusion with double negation and booleans][36856]
7132 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7133 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7134 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7135 * [Corrupted memory after updated to 1.12][36936]
7136 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7137 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7138 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7140 [36381]: https://github.com/rust-lang/rust/issues/36381
7141 [36856]: https://github.com/rust-lang/rust/issues/36856
7142 [36875]: https://github.com/rust-lang/rust/issues/36875
7143 [36924]: https://github.com/rust-lang/rust/issues/36924
7144 [36926]: https://github.com/rust-lang/rust/issues/36926
7145 [36936]: https://github.com/rust-lang/rust/issues/36936
7146 [37026]: https://github.com/rust-lang/rust/issues/37026
7147 [37112]: https://github.com/rust-lang/rust/issues/37112
7148 [37153]: https://github.com/rust-lang/rust/issues/37153
7151 Version 1.12.0 (2016-09-29)
7152 ===========================
7157 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7158 This translation pass is far simpler than the previous AST->LLVM pass, and
7159 creates opportunities to perform new optimizations directly on the MIR. It
7160 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7161 * [`rustc` presents a new, more readable error format, along with
7162 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7163 Most common editors supporting Rust have been updated to work with it. It was
7164 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7169 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7170 This translation pass is far simpler than the previous AST->LLVM pass, and
7171 creates opportunities to perform new optimizations directly on the MIR. It
7172 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7173 * [Print the Rust target name, not the LLVM target name, with
7174 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7175 * [The computation of `TypeId` is correct in some cases where it was previously
7176 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7177 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7178 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7179 `--print relocation-models`, and `--print code-models` print the available
7180 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7181 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7182 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7183 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7184 These targets produce statically-linked binaries. There are no binary release
7190 * [`rustc` presents a new, more readable error format, along with
7191 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7192 Most common editors supporting Rust have been updated to work with it. It was
7193 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7194 * [In error descriptions, references are now described in plain English,
7195 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7196 * [In error type descriptions, unknown numeric types are named `{integer}` or
7197 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7198 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7203 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7204 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7205 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7206 useful](https://github.com/rust-lang/rust/pull/34908)
7207 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7208 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7209 * [Semicolons are properly required as statement delimiters inside
7210 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7211 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7216 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7217 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7218 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7219 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7220 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7221 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7222 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7223 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7224 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7225 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7226 Both on Unix and Windows.
7227 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7228 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7229 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7230 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7231 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7232 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7233 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7234 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7239 * [The `format!` macro and friends now allow a single argument to be formatted
7240 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7241 * [The lifetime bounds on `[T]::binary_search_by` and
7242 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7243 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7244 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7245 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7246 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7247 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7248 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7249 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7250 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7251 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7252 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7253 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7254 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7255 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7256 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7257 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7258 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7259 * [`mpsc::sync_channel` `Receiver`s return any available message before
7260 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7261 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7262 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7267 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7268 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7269 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7270 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7271 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7272 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7273 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7274 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7275 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7276 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7277 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7278 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7279 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7280 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7281 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7282 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7287 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7288 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7293 * [Test binaries now support a `--test-threads` argument to specify the number
7294 of threads used to run tests, and which acts the same as the
7295 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7296 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7297 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7298 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7299 * [Rust releases now come with source packages that can be installed by rustup
7300 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7301 The resulting source code can be used by tools and IDES, located in the
7302 sysroot under `lib/rustlib/src`.
7307 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7308 * Many minor improvements to the documentation.
7309 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7314 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7315 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7316 * [When formatting strings, if "precision" is specified, the "fill",
7317 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7318 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7321 Version 1.11.0 (2016-08-18)
7322 ===========================
7327 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7328 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7329 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7330 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7335 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7336 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7337 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7338 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7339 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7340 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7341 (in libcore - previously stabilized in libstd)
7342 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7343 (in libcore - previously stabilized in libstd)
7344 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7345 (in libcore - previously stabilized in libstd)
7346 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7347 (in libcore - previously stabilized in libstd)
7348 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7349 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7350 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7351 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7356 * [The `thread_local!` macro supports multiple definitions in a single
7357 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7358 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7359 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7360 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7361 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7362 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7363 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7364 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7369 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7370 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7371 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7372 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7373 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7374 and `-vv` prints warnings for all crates.
7375 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7376 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7377 This provides room for expansion by arbitrary tools.
7378 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7379 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7380 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7381 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7382 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7383 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7384 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7389 * [Caching projections speeds up type check dramatically for some
7390 workloads](https://github.com/rust-lang/rust/pull/33816)
7391 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7392 This hasher is faster, but is believed to provide sufficient
7393 protection from collision attacks.
7394 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7399 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7400 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7401 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7402 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7403 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7408 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7409 * [When emitting debug info, rustc emits frame pointers for closures,
7410 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7411 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7412 * Many more errors have been given error codes and extended
7414 * API documentation continues to be improved, with many new examples
7419 * [rustc no longer hangs when dependencies recursively re-export
7420 submodules](https://github.com/rust-lang/rust/pull/34542)
7421 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7422 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7423 rewritten](https://github.com/rust-lang/rust/pull/33895)
7424 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7425 No targets use this yet, but it works toward AVR support.
7430 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7431 * [The new follow-set rules that place restrictions on `macro_rules!`
7432 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7433 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7434 and has been a warning since 1.10.
7435 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7436 This causes breakage in some corner cases.
7439 Version 1.10.0 (2016-07-07)
7440 ===========================
7445 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7446 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7447 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7448 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7449 * [`panic!` can be converted to a runtime abort with the
7450 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7451 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7452 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7453 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7454 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7455 Note that Cargo does not yet directly support cdylibs.
7460 * `os::windows::fs::OpenOptionsExt::access_mode`
7461 * `os::windows::fs::OpenOptionsExt::share_mode`
7462 * `os::windows::fs::OpenOptionsExt::custom_flags`
7463 * `os::windows::fs::OpenOptionsExt::attributes`
7464 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7465 * `os::unix::fs::OpenOptionsExt::custom_flags`
7466 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7467 * `Default for sync::Weak`
7468 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7469 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7470 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7471 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7472 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7473 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7474 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7475 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7476 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7477 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7478 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7479 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7480 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7481 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7482 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7483 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7484 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7485 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7486 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7487 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7488 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7489 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7490 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7491 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7492 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7493 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7494 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7495 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7496 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7497 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7498 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7499 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7500 * Read/Write/RawFd impls for `UnixStream`
7501 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7502 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7503 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7504 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7505 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7506 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7507 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7508 * RawFd impls for `UnixListener`
7509 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7510 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7511 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7512 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7513 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7514 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7515 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7516 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7517 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7518 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7519 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7520 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7521 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7522 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7523 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7524 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7525 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7526 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7527 * RawFd impls for `UnixDatagram`
7528 * `{BTree,Hash}Map::values_mut`
7529 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7534 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7535 The semantics of this minor method are subtle and probably not what
7537 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7538 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7539 will fall back to `/dev/urandom` temporarily to avoid blocking
7540 during early boot](https://github.com/rust-lang/rust/pull/33086).
7541 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7542 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7543 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7544 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7545 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7546 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7547 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7551 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7552 This controls the runtime behavior of the `panic!` macro
7553 and can be either "unwind" (the default), or "abort".
7554 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7555 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7556 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7557 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7558 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7559 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7560 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7561 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7562 By default they are retried twice, which can be customized with the
7563 `net.retry` value in `.cargo/config`.
7564 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7565 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7566 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7567 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7568 Makes it possible to install multiple crates in parallel.
7569 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7570 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7571 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7572 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7573 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7574 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7579 * [rustc memory usage was reduced by refactoring the context used for
7580 type checking](https://github.com/rust-lang/rust/pull/33425).
7581 * [Speed up creation of `HashMap`s by caching the random keys used
7582 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7583 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7584 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7585 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7586 10x faster than the previous lookup tables.
7587 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7592 * Many incremental improvements to documentation and rustdoc.
7593 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7594 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7595 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7596 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7597 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7598 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7599 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7604 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7605 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7606 * [`std` no longer prints backtraces on platforms where the running
7607 module must be loaded with `env::current_exe`, which can't be relied
7608 on](https://github.com/rust-lang/rust/pull/33554).
7609 * This release includes std binaries for the i586-unknown-linux-gnu,
7610 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7611 i586 target is for old x86 hardware without SSE2, and the armv7
7612 target is for Android running on modern ARM architectures.
7613 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7614 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7615 * [On Unix the runtime aborts by calling `libc::abort` instead of
7616 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7617 * [Rust is now bootstrapped from the previous release of Rust,
7618 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7623 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7624 * [`target_env` for Linux ARM targets is just `gnu`, not
7625 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7626 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7627 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7628 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7629 Affects how macros are parsed.
7630 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7631 * [Feature-gated attributes on macro-generated macro invocations are
7632 now rejected](https://github.com/rust-lang/rust/pull/32791).
7633 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7634 This caused some minor changes to type inference.
7637 Version 1.9.0 (2016-05-26)
7638 ==========================
7643 * The `#[deprecated]` attribute when applied to an API will generate
7644 warnings when used. The warnings may be suppressed with
7645 `#[allow(deprecated)]`. [RFC 1270].
7646 * [`fn` item types are zero sized, and each `fn` names a unique
7647 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7648 `transmute` on a `fn` type will generate a warning for a few cycles,
7649 then will be converted to an error.
7650 * [Field and method resolution understand visibility, so private
7651 fields and methods cannot prevent the proper use of public fields
7652 and methods][1.9fv].
7653 * [The parser considers unicode codepoints in the
7654 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7660 * [`std::panic::catch_unwind`] (renamed from `recover`)
7661 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7662 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7663 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7664 * [`str::is_char_boundary`]
7665 * [`<*const T>::as_ref`]
7666 * [`<*mut T>::as_ref`]
7667 * [`<*mut T>::as_mut`]
7668 * [`AsciiExt::make_ascii_uppercase`]
7669 * [`AsciiExt::make_ascii_lowercase`]
7670 * [`char::decode_utf16`]
7671 * [`char::DecodeUtf16`]
7672 * [`char::DecodeUtf16Error`]
7673 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7674 * [`BTreeSet::take`]
7675 * [`BTreeSet::replace`]
7678 * [`HashSet::replace`]
7680 * [`OsString::with_capacity`]
7681 * [`OsString::clear`]
7682 * [`OsString::capacity`]
7683 * [`OsString::reserve`]
7684 * [`OsString::reserve_exact`]
7685 * [`OsStr::is_empty`]
7687 * [`std::os::unix::thread`]
7690 * [`JoinHandleExt::as_pthread_t`]
7691 * [`JoinHandleExt::into_pthread_t`]
7692 * [`HashSet::hasher`]
7693 * [`HashMap::hasher`]
7694 * [`CommandExt::exec`]
7695 * [`File::try_clone`]
7696 * [`SocketAddr::set_ip`]
7697 * [`SocketAddr::set_port`]
7698 * [`SocketAddrV4::set_ip`]
7699 * [`SocketAddrV4::set_port`]
7700 * [`SocketAddrV6::set_ip`]
7701 * [`SocketAddrV6::set_port`]
7702 * [`SocketAddrV6::set_flowinfo`]
7703 * [`SocketAddrV6::set_scope_id`]
7704 * [`slice::copy_from_slice`]
7705 * [`ptr::read_volatile`]
7706 * [`ptr::write_volatile`]
7707 * [`OpenOptions::create_new`]
7708 * [`TcpStream::set_nodelay`]
7709 * [`TcpStream::nodelay`]
7710 * [`TcpStream::set_ttl`]
7711 * [`TcpStream::ttl`]
7712 * [`TcpStream::set_only_v6`]
7713 * [`TcpStream::only_v6`]
7714 * [`TcpStream::take_error`]
7715 * [`TcpStream::set_nonblocking`]
7716 * [`TcpListener::set_ttl`]
7717 * [`TcpListener::ttl`]
7718 * [`TcpListener::set_only_v6`]
7719 * [`TcpListener::only_v6`]
7720 * [`TcpListener::take_error`]
7721 * [`TcpListener::set_nonblocking`]
7722 * [`UdpSocket::set_broadcast`]
7723 * [`UdpSocket::broadcast`]
7724 * [`UdpSocket::set_multicast_loop_v4`]
7725 * [`UdpSocket::multicast_loop_v4`]
7726 * [`UdpSocket::set_multicast_ttl_v4`]
7727 * [`UdpSocket::multicast_ttl_v4`]
7728 * [`UdpSocket::set_multicast_loop_v6`]
7729 * [`UdpSocket::multicast_loop_v6`]
7730 * [`UdpSocket::set_multicast_ttl_v6`]
7731 * [`UdpSocket::multicast_ttl_v6`]
7732 * [`UdpSocket::set_ttl`]
7733 * [`UdpSocket::ttl`]
7734 * [`UdpSocket::set_only_v6`]
7735 * [`UdpSocket::only_v6`]
7736 * [`UdpSocket::join_multicast_v4`]
7737 * [`UdpSocket::join_multicast_v6`]
7738 * [`UdpSocket::leave_multicast_v4`]
7739 * [`UdpSocket::leave_multicast_v6`]
7740 * [`UdpSocket::take_error`]
7741 * [`UdpSocket::connect`]
7742 * [`UdpSocket::send`]
7743 * [`UdpSocket::recv`]
7744 * [`UdpSocket::set_nonblocking`]
7749 * [`std::sync::Once` is poisoned if its initialization function
7751 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7752 * [Most types implement `fmt::Debug`][1.9db].
7753 * [The default buffer size used by `BufReader` and `BufWriter` was
7754 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7755 used by other languages.
7756 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7757 `Duration` additionally implements `*=` and `/=`][1.9ta].
7758 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7759 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7760 * [`Chain` implements `BufRead`][1.9ch].
7761 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7766 * [Cargo can now run concurrently][1.9cc].
7767 * [Top-level overrides allow specific revisions of crates to be
7768 overridden through the entire crate graph][1.9ct]. This is intended
7769 to make upgrades easier for large projects, by allowing crates to be
7770 forked temporarily until they've been upgraded and republished.
7771 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7772 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7773 on the commandline][1.9cf]. `rustc` arguments can also be specified
7774 in the `build.rustflags` configuration key.
7779 * [The time complexity of comparing variables for equivalence during type
7780 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7781 to major compilation time improvement in some scenarios.
7782 * [`ToString` is specialized for `str`, giving it the same performance
7783 as `to_owned`][1.9ts].
7784 * [Spawning processes with `Command::output` no longer creates extra
7786 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7787 for C-like enums][1.9cl].
7792 * [Passing the `--quiet` flag to a test runner will produce
7793 much-abbreviated output][1.9q].
7794 * The Rust Project now publishes std binaries for the
7795 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7796 `i586-pc-windows-msvc` targets.
7801 * [`std::sync::Once` is poisoned if its initialization function
7803 * [It is illegal to define methods with the same name in overlapping
7804 inherent `impl` blocks][1.9sn].
7805 * [`fn` item types are zero sized, and each `fn` names a unique
7806 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7807 `transmute` on a `fn` type will generate a warning for a few cycles,
7808 then will be converted to an error.
7809 * [Improvements to const evaluation may trigger new errors when integer
7810 literals are out of range][1.9ce].
7813 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7814 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7815 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7816 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7817 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7818 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7819 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7820 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7821 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7822 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7823 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7824 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7825 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7826 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7827 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7828 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7829 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7830 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7831 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7832 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7833 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7834 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7835 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7836 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7837 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7838 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7839 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7840 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7841 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7842 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7843 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7844 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7845 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7846 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7847 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7848 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7849 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7850 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7851 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7852 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7853 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7854 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7855 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7856 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7857 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7858 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7859 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7860 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7861 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7862 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7863 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7864 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7865 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7866 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7867 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7868 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7869 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7870 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7871 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7872 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7873 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7874 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7875 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7876 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7877 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7878 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7879 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7880 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7881 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7882 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7883 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7884 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7885 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7886 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7887 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7888 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7889 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7890 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7891 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7892 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7893 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7894 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7895 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7896 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7897 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7898 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7899 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7900 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7901 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7902 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7903 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7904 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7905 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7906 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7907 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7908 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7909 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7910 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7911 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7912 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7913 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7914 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7915 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7916 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7917 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7918 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7919 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7920 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7921 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7922 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7925 Version 1.8.0 (2016-04-14)
7926 ==========================
7931 * Rust supports overloading of compound assignment statements like
7932 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7933 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7934 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7936 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7937 addition to the non-braced form, `struct Foo;`. [RFC 218].
7943 * [`str::encode_utf16`] (renamed from `utf16_units`)
7944 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7947 * [`ptr::drop_in_place`]
7949 * [`time::SystemTime`]
7951 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7952 * [`Instant::elapsed`]
7953 * [`SystemTime::now`]
7954 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7955 * [`SystemTime::elapsed`]
7956 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7957 * [`SystemTimeError`]
7958 * [`SystemTimeError::duration`]
7959 * Various impls for `SystemTimeError`
7961 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7962 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7963 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7964 * [The `write!` and `writeln!` macros correctly emit errors if any of
7965 their arguments can't be formatted][1.8w].
7966 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7967 * [The Unix-specific `raw` modules, which contain a number of
7968 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7969 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7970 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7971 across platforms was making it difficult to implement `std`
7972 correctly. Those that need these definitions should use the `libc`
7974 * The Unix-specific `MetadataExt` traits, including
7975 `os::unix::fs::MetadataExt`, which expose values such as inode
7976 numbers [no longer return platform-specific types][1.8r], but
7977 instead return widened integers. [RFC 1415].
7978 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7979 * [Atomic loads and stores are not volatile][1.8a].
7980 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7985 * [Inlining hash functions lead to a 3% compile-time improvement in
7986 some workloads][1.8h].
7987 * When using jemalloc, its symbols are [unprefixed so that it
7988 overrides the libc malloc implementation][1.8h]. This means that for
7989 rustc, LLVM is now using jemalloc, which results in a 6%
7990 compile-time improvement on a specific workload.
7991 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7996 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7997 i686-pc-windows-msvc is now considered a tier-1 platform.
7998 * [The `--print targets` flag prints a list of supported targets][1.8t].
7999 * [The `--print cfg` flag prints the `cfg`s defined for the current
8001 * [`rustc` can be built with an new Cargo-based build system, written
8002 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8003 build system. To enable it configure with `configure --rustbuild`.
8004 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8005 variants while also indicating the total number of missing variants
8006 if more than 3][1.8m].
8007 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8008 * The Rust Project now publishes binary releases of the standard
8009 library for a number of tier-2 targets:
8010 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8011 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8012 `x86_64-rumprun-netbsd`. These can be installed with
8013 tools such as [multirust][1.8mr].
8018 * [`cargo init` creates a new Cargo project in the current
8019 directory][1.8ci]. It is otherwise like `cargo new`.
8020 * [Cargo has configuration keys for `-v` and
8021 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8022 `[term]` section of `.cargo/config`.
8023 * [Configuration keys that evaluate to strings or integers can be set
8024 via environment variables][1.8ce]. For example the `build.jobs` key
8025 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8026 precedence over config files.
8027 * [Target-specific dependencies support Rust `cfg` syntax for
8028 describing targets][1.8cfg] so that dependencies for multiple
8029 targets can be specified together. [RFC 1361].
8030 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8031 `RUSTDOC` take precedence over the `build.target-dir`,
8032 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
8033 * [The child process tree is killed on Windows when Cargo is
8035 * [The `build.target` configuration value sets the target platform,
8036 like `--target`][1.8ct].
8041 * [Unstable compiler flags have been further restricted][1.8u]. Since
8042 1.0 `-Z` flags have been considered unstable, and other flags that
8043 were considered unstable additionally required passing `-Z
8044 unstable-options` to access. Unlike unstable language and library
8045 features though, these options have been accessible on the stable
8046 release channel. Going forward, *new unstable flags will not be
8047 available on the stable release channel*, and old unstable flags
8048 will warn about their usage. In the future, all unstable flags will
8049 be unavailable on the stable release channel.
8050 * [It is no longer possible to `match` on empty enum variants using
8051 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8052 * The Unix-specific `MetadataExt` traits, including
8053 `os::unix::fs::MetadataExt`, which expose values such as inode
8054 numbers [no longer return platform-specific types][1.8r], but
8055 instead return widened integers. [RFC 1415].
8056 * [Modules sourced from the filesystem cannot appear within arbitrary
8057 blocks, but only within other modules][1.8mf].
8058 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8059 * On Unix, [stack overflow triggers a runtime abort instead of a
8061 * [`Command::spawn` and its equivalents return an error if any of
8062 its command-line arguments contain interior `NUL`s][1.8n].
8063 * [Tuple and unit enum variants from other crates are in the type
8065 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8066 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8067 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8068 instead of `foo.lib`.
8071 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8072 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8073 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8074 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8075 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8076 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8077 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8078 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8079 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8080 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8081 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8082 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
8083 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8084 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8085 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8086 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8087 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8088 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8089 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8090 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8091 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8092 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8093 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8094 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8095 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8096 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8097 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8098 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8099 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8100 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8101 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8102 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8103 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8104 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8105 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8106 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8107 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8108 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8109 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8110 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8111 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8112 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8113 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8114 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8115 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8116 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8117 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8118 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8119 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8120 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8121 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8122 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8123 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8124 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8125 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8126 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8127 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8128 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8129 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8130 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8133 Version 1.7.0 (2016-03-03)
8134 ==========================
8141 * [`Path::strip_prefix`] (renamed from relative_from)
8142 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8144 * [`Ipv4Addr::is_loopback`]
8145 * [`Ipv4Addr::is_private`]
8146 * [`Ipv4Addr::is_link_local`]
8147 * [`Ipv4Addr::is_multicast`]
8148 * [`Ipv4Addr::is_broadcast`]
8149 * [`Ipv4Addr::is_documentation`]
8151 * [`Ipv6Addr::is_unspecified`]
8152 * [`Ipv6Addr::is_loopback`]
8153 * [`Ipv6Addr::is_multicast`]
8156 * [`Vec::as_mut_slice`]
8158 * [`String::as_str`]
8159 * [`String::as_mut_str`]
8161 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8163 * `<[T]>::`[`sort_by_key`]
8164 * checked, saturated, and overflowing operations
8165 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8166 * [`i32::saturating_mul`]
8167 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8168 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8169 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8170 * [`u32::saturating_mul`]
8171 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8172 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8173 * and checked, saturated, and overflowing operations for other primitive types
8175 * [`ffi::IntoStringError`]
8176 * [`CString::into_string`]
8177 * [`CString::into_bytes`]
8178 * [`CString::into_bytes_with_nul`]
8179 * `From<CString> for Vec<u8>`
8181 * [`IntoStringError::into_cstring`]
8182 * [`IntoStringError::utf8_error`]
8183 * `Error for IntoStringError`
8185 * [`std::hash::BuildHasher`]
8186 * [`BuildHasher::Hasher`]
8187 * [`BuildHasher::build_hasher`]
8188 * [`std::hash::BuildHasherDefault`]
8189 * [`HashMap::with_hasher`]
8190 * [`HashMap::with_capacity_and_hasher`]
8191 * [`HashSet::with_hasher`]
8192 * [`HashSet::with_capacity_and_hasher`]
8193 * [`std::collections::hash_map::RandomState`]
8194 * [`RandomState::new`]
8195 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8196 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8197 from bytes is faster.
8198 * [The performance of `LineWriter` (and thus `io::stdout`) was
8199 improved by using `memchr` to search for newlines][1.7m].
8200 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8201 `f64` variants were stabilized previously.
8202 * [`BTreeMap` was rewritten to use less memory and improve the performance
8203 of insertion and iteration, the latter by as much as 5x][1.7bm].
8204 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8205 covariant over their contained type][1.7bt].
8206 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8207 over their contained type][1.7ll].
8208 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8210 * [`Any` is implemented for unsized types][1.7a].
8211 * [`Hash` is implemented for `Duration`][1.7h].
8216 * [When running tests with `--test`, rustdoc will pass `--cfg`
8217 arguments to the compiler][1.7dt].
8218 * [The compiler is built with RPATH information by default][1.7rpa].
8219 This means that it will be possible to run `rustc` when installed in
8220 unusual configurations without configuring the dynamic linker search
8222 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8223 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8224 over `LD_LIBRARY_PATH`.
8229 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8230 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8231 * [The `rerun-if-changed` build script directive no longer causes the
8232 build script to incorrectly run twice in certain scenarios][1.7rr].
8237 * Soundness fixes to the interactions between associated types and
8238 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8239 code that violates the new rules. This is a significant change that
8240 is known to break existing code, so it has emitted warnings for the
8241 new error cases since 1.4 to give crate authors time to adapt. The
8242 details of what is changing are subtle; read the RFC for more.
8243 * [Several bugs in the compiler's visibility calculations were
8244 fixed][1.7v]. Since this was found to break significant amounts of
8245 code, the new errors will be emitted as warnings for several release
8246 cycles, under the `private_in_public` lint.
8247 * Defaulted type parameters were accidentally accepted in positions
8248 that were not intended. In this release, [defaulted type parameters
8249 appearing outside of type definitions will generate a
8250 warning][1.7d], which will become an error in future releases.
8251 * [Parsing "." as a float results in an error instead of 0][1.7p].
8252 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8253 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8255 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8256 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8257 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8258 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8259 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8260 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8261 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8262 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8263 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8264 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8265 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8266 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8267 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8268 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8269 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8270 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8271 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8272 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8273 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8274 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8275 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8276 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8277 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8278 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8279 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8280 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8281 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8282 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8283 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8284 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8285 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8286 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8287 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8288 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8289 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8290 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8291 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8292 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8293 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8294 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8295 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8296 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8297 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8298 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8299 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8300 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8301 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8302 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8303 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8304 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8305 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8306 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8307 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8308 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8309 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8310 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8311 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8312 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8313 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8314 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8315 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8316 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8317 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8318 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8319 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8320 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8321 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8322 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8323 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8324 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8325 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8326 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8327 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8328 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8329 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8330 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8331 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8332 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8333 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8336 Version 1.6.0 (2016-01-21)
8337 ==========================
8342 * The `#![no_std]` attribute causes a crate to not be linked to the
8343 standard library, but only the [core library][1.6co], as described
8344 in [RFC 1184]. The core library defines common types and traits but
8345 has no platform dependencies whatsoever, and is the basis for Rust
8346 software in environments that cannot support a full port of the
8347 standard library, such as operating systems. Most of the core
8348 library is now stable.
8354 [`Read::read_exact`],
8355 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8356 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8357 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8358 [`os::unix::fs::DirBuilderExt`],
8359 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8360 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8361 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8362 [`collections::hash_map::Drain`],
8363 [`collections::hash_map::HashMap::drain`],
8364 [`collections::hash_set::Drain`],
8365 [`collections::hash_set::HashSet::drain`],
8366 [`collections::binary_heap::Drain`],
8367 [`collections::binary_heap::BinaryHeap::drain`],
8368 [`Vec::extend_from_slice`] (renamed from `push_all`),
8369 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8370 [`RwLock::into_inner`],
8371 [`Iterator::min_by_key`] (renamed from `min_by`),
8372 [`Iterator::max_by_key`] (renamed from `max_by`).
8373 * The [core library][1.6co] is stable, as are most of its APIs.
8374 * [The `assert_eq!` macro supports arguments that don't implement
8375 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8377 * Several timer functions that take duration in milliseconds [are
8378 deprecated in favor of those that take `Duration`][1.6ms]. These
8379 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8380 `thread::park_timeout_ms`.
8381 * The algorithm by which `Vec` reserves additional elements was
8382 [tweaked to not allocate excessive space][1.6a] while still growing
8384 * `From` conversions are [implemented from integers to floats][1.6f]
8385 in cases where the conversion is lossless. Thus they are not
8386 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8387 or `f64`. They are also not implemented for `isize` and `usize`
8388 because the implementations would be platform-specific. `From` is
8389 also implemented from `f32` to `f64`.
8390 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8391 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8392 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8393 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8395 * Sorting slices that are already sorted [is 50% faster in some
8401 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8402 * Cargo build scripts can specify their dependencies by emitting the
8403 [`rerun-if-changed`][1.6rr] key.
8404 * crates.io will reject publication of crates with dependencies that
8405 have a wildcard version constraint. Crates with wildcard
8406 dependencies were seen to cause a variety of problems, as described
8407 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8409 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8410 release folder. A variety of artifacts that Cargo failed to clean
8411 are now correctly deleted.
8416 * The `unreachable_code` lint [warns when a function call's argument
8418 * The parser indicates [failures that may be caused by
8419 confusingly-similar Unicode characters][1.6uc]
8420 * Certain macro errors [are reported at definition time][1.6m], not
8426 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8427 environment variable when locating crates. This was a pre-cargo
8428 feature for integrating with the package manager that was
8429 accidentally never removed.
8430 * [A number of bugs were fixed in the privacy checker][1.6p] that
8431 could cause previously-accepted code to break.
8432 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8433 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8434 struct pattern syntax (`Foo(..)`) can no longer be used to match
8435 unit structs. This is a warning now, but will become an error in
8436 future releases. Patterns that share the same name as a const are
8438 * A bug was fixed that causes [rustc not to apply default type
8439 parameters][1.6xc] when resolving certain method implementations of
8440 traits defined in other crates.
8442 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8443 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8444 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8445 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8446 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8447 [1.6co]: http://doc.rust-lang.org/core/index.html
8448 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8449 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8450 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8451 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8452 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8453 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8454 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8455 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8456 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8457 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8458 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8459 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8460 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8461 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8462 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8463 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8464 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8465 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8466 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8467 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8468 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8469 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8470 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8471 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8472 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8473 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8474 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8475 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8476 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8477 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8478 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8479 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8480 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8481 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8482 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8483 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8484 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8485 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8486 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8487 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8488 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8491 Version 1.5.0 (2015-12-10)
8492 ==========================
8494 * ~700 changes, numerous bugfixes
8500 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8501 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8502 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8503 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8504 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8505 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8506 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8507 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8508 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8509 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8510 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8511 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8512 [`Path::read_link`], [`Path::symlink_metadata`],
8513 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8514 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8515 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8516 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8517 [`slice::split_first_mut`], [`slice::split_first`],
8518 [`slice::split_last_mut`], [`slice::split_last`],
8519 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8520 [`str::MatchIndices`], [`str::RMatchIndices`],
8521 [`str::match_indices`], [`str::rmatch_indices`],
8522 [`str::slice_mut_unchecked`], [`string::ParseError`].
8523 * Rust applications hosted on crates.io can be installed locally to
8524 `~/.cargo/bin` with the [`cargo install`] command. Among other
8525 things this makes it easier to augment Cargo with new subcommands:
8526 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8527 invoked as `cargo foo`.
8528 * Crates with wildcard (`*`) dependencies will [emit warnings when
8529 published][1.5w]. In 1.6 it will no longer be possible to publish
8530 crates with wildcard dependencies.
8535 * The rules determining when a particular lifetime must outlive
8536 a particular value (known as '[dropck]') have been [modified
8537 to not rely on parametricity][1.5p].
8538 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8539 and `Arc`][1.5a]. Because these smart pointer types implement
8540 `Deref`, this causes breakage in cases where the interior type
8541 contains methods of the same name.
8542 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8543 that they could drop their content. Soundness fix.
8544 * All method invocations are [properly checked][1.5wf1] for
8545 [well-formedness][1.5wf2]. Soundness fix.
8546 * Traits whose supertraits contain `Self` are [not object
8547 safe][1.5o]. Soundness fix.
8548 * Target specifications support a [`no_default_libraries`][1.5nd]
8549 setting that controls whether `-nodefaultlibs` is passed to the
8550 linker, and in turn the `is_like_windows` setting no longer affects
8551 the `-nodefaultlibs` flag.
8552 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8553 * The `#[inline]` and `#[repr]` attributes [can only appear
8554 in valid locations][1.5at].
8555 * Native libraries linked from the local crate are [passed to
8556 the linker before native libraries from upstream crates][1.5nl].
8557 * Two rarely-used attributes, `#[no_debug]` and
8558 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8559 * Negation of unsigned integers, which has been a warning for
8560 several releases, [is now behind a feature gate and will
8561 generate errors][1.5nu].
8562 * The parser accidentally accepted visibility modifiers on
8563 enum variants, a bug [which has been fixed][1.5ev].
8564 * [A bug was fixed that allowed `use` statements to import unstable
8570 * When evaluating expressions at compile-time that are not
8571 compile-time constants (const-evaluating expressions in non-const
8572 contexts), incorrect code such as overlong bitshifts and arithmetic
8573 overflow will [generate a warning instead of an error][1.5ce],
8574 delaying the error until runtime. This will allow the
8575 const-evaluator to be expanded in the future backwards-compatibly.
8576 * The `improper_ctypes` lint [no longer warns about using `isize` and
8577 `usize` in FFI][1.5ict].
8582 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8584 * `Default` is [implemented for mutable slices][1.5d].
8585 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8586 * There are now `From` conversions [between floating point
8587 types][1.5f] where the conversions are lossless.
8588 * There are now `From` conversions [between integer types][1.5i] where
8589 the conversions are lossless.
8590 * [`fs::Metadata` implements `Clone`][1.5fs].
8591 * The `parse` method [accepts a leading "+" when parsing
8593 * [`AsMut` is implemented for `Vec`][1.5am].
8594 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8595 been optimized][1.5cf] and no longer rely on the default impl.
8596 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8597 `unsafe extern "C"` function types now [implement `Clone`,
8598 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8599 `fmt::Debug` for up to 12 arguments][1.5fp].
8600 * [Dropping `Vec`s is much faster in unoptimized builds when the
8601 element types don't implement `Drop`][1.5dv].
8602 * A bug that caused in incorrect behavior when [combining `VecDeque`
8603 with zero-sized types][1.5vdz] was resolved.
8604 * [`PartialOrd` for slices is faster][1.5po].
8609 * [Crate metadata size was reduced by 20%][1.5md].
8610 * [Improvements to code generation reduced the size of libcore by 3.3
8611 MB and rustc's memory usage by 18MB][1.5m].
8612 * [Improvements to deref translation increased performance in
8613 unoptimized builds][1.5dr].
8614 * Various errors in trait resolution [are deduplicated to only be
8615 reported once][1.5te].
8616 * Rust has preliminary [support for rumprun kernels][1.5rr].
8617 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8619 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8620 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8621 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8622 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8623 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8624 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8625 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8626 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8627 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8628 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8629 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8630 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8631 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8632 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8633 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8634 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8635 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8636 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8637 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8638 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8639 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8640 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8641 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8642 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8643 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8644 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8645 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8646 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8647 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8648 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8649 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8650 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8651 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8652 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8653 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8654 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8655 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8656 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8657 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8658 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8659 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8660 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8661 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8662 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8663 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8664 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8665 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8666 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8667 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8668 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8669 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8670 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8671 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8672 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8673 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8674 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8675 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8676 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8677 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8678 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8679 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8680 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8681 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8682 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8683 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8684 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8685 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8686 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8687 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8688 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8689 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8690 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8691 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8692 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8693 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8694 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8695 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8696 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8697 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8698 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8699 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8700 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8701 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8702 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8703 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8704 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8705 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8706 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8707 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8709 Version 1.4.0 (2015-10-29)
8710 ==========================
8712 * ~1200 changes, numerous bugfixes
8717 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8718 GNU) are now supported and recommended for use.
8723 * [Several changes have been made to fix type soundness and improve
8724 the behavior of associated types][sound]. See [RFC 1214]. Although
8725 we have mostly introduced these changes as warnings this release, to
8726 become errors next release, there are still some scenarios that will
8727 see immediate breakage.
8728 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8729 line breaks in addition to `\n`][crlf].
8730 * [Loans of `'static` lifetime extend to the end of a function][stat].
8731 * [`str::parse` no longer introduces avoidable rounding error when
8732 parsing floating point numbers. Together with earlier changes to
8733 float formatting/output, "round trips" like f.to_string().parse()
8734 now preserve the value of f exactly. Additionally, leading plus
8735 signs are now accepted][fp3].
8741 * `use` statements that import multiple items [can now rename
8742 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8743 * [Binops work correctly on fat pointers][binfat].
8744 * `pub extern crate`, which does not behave as expected, [issues a
8745 warning][pec] until a better solution is found.
8750 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8751 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8752 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8753 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8754 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8755 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8756 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8757 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8758 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8759 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8760 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8761 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8762 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8763 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8764 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8765 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8766 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8767 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8769 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8770 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8771 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8772 `f64::from_str_radix`.
8773 * [Reverse-searching strings is faster with the 'two-way'
8775 * [`std::io::copy` allows `?Sized` arguments][cc].
8776 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8777 [override `count`, `nth` and `last` with an *O*(1)
8778 implementation][it].
8779 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8780 * [`IntoRawFd` has been added to the Unix-specific prelude,
8781 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8783 * [`Extend<String>` and `FromIterator<String` are both implemented for
8785 * [`IntoIterator` is implemented for references to `Option` and
8787 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8788 Copy`][ext] as part of [RFC 839]. This will cause type inference
8789 breakage in rare situations.
8790 * [`BinaryHeap` implements `Debug`][bh2].
8791 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8793 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8794 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8795 * [String comparison is faster][faststr].
8796 * `&mut T` where `T: std::fmt::Write` [also implements
8797 `std::fmt::Write`][mutw].
8798 * [A stable regression in `VecDeque::push_back` and other
8799 capacity-altering methods that caused panics for zero-sized types
8801 * [Function pointers implement traits for up to 12 parameters][fp2].
8806 * The compiler [no longer uses the 'morestack' feature to prevent
8807 stack overflow][mm]. Instead it uses guard pages and stack
8808 probes (though stack probes are not yet implemented on any platform
8810 * [The compiler matches traits faster when projections are involved][p].
8811 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8813 * [Cargo now displays useful information about what its doing during
8814 `cargo update`][cu].
8816 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8817 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8818 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8819 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8820 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8821 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8822 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8823 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8824 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8825 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8826 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8827 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8828 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8829 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8830 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8831 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8832 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8833 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8834 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8835 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8836 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8837 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8838 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8839 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8840 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8841 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8842 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8843 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8844 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8845 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8846 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8847 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8848 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8849 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8850 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8851 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8852 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8853 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8854 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8855 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8856 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8857 [bh2]: https://github.com/rust-lang/rust/pull/28156
8858 [binfat]: https://github.com/rust-lang/rust/pull/28270
8859 [bm]: https://github.com/rust-lang/rust/pull/28197
8860 [cc]: https://github.com/rust-lang/rust/pull/27531
8861 [crlf]: https://github.com/rust-lang/rust/pull/28034
8862 [cu]: https://github.com/rust-lang/cargo/pull/1931
8863 [d]: https://github.com/rust-lang/rust/pull/27825
8864 [dep]: https://github.com/rust-lang/rust/pull/28339
8865 [es]: https://github.com/rust-lang/rust/pull/27956
8866 [ext]: https://github.com/rust-lang/rust/pull/28094
8867 [faststr]: https://github.com/rust-lang/rust/pull/28338
8868 [ffi]: https://github.com/rust-lang/rust/pull/28779
8869 [fp]: https://github.com/rust-lang/rust/pull/28268
8870 [fp2]: https://github.com/rust-lang/rust/pull/28560
8871 [fp3]: https://github.com/rust-lang/rust/pull/27307
8872 [i]: https://github.com/rust-lang/rust/pull/27451
8873 [into2]: https://github.com/rust-lang/rust/pull/28039
8874 [it]: https://github.com/rust-lang/rust/pull/27652
8875 [mm]: https://github.com/rust-lang/rust/pull/27338
8876 [mutw]: https://github.com/rust-lang/rust/pull/28368
8877 [sound]: https://github.com/rust-lang/rust/pull/27641
8878 [p]: https://github.com/rust-lang/rust/pull/27866
8879 [pec]: https://github.com/rust-lang/rust/pull/28486
8880 [pr]: https://github.com/rust-lang/rust/pull/27896
8881 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8882 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8883 [s]: https://github.com/rust-lang/rust/pull/27474
8884 [stab]: https://github.com/rust-lang/rust/pull/28339
8885 [stat]: https://github.com/rust-lang/rust/pull/28321
8886 [vd]: https://github.com/rust-lang/rust/pull/28494
8888 Version 1.3.0 (2015-09-17)
8889 ==============================
8891 * ~900 changes, numerous bugfixes
8896 * The [new object lifetime defaults][nold] have been [turned
8897 on][nold2] after a cycle of warnings about the change. Now types
8898 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8899 being interpreted as `&'a Box<Trait+'a>` to `&'a
8900 Box<Trait+'static>`.
8901 * [The Rustonomicon][nom] is a new book in the official documentation
8902 that dives into writing unsafe Rust.
8903 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8904 timekeeping is employed by other std APIs, as well as out-of-tree
8910 * The [new object lifetime defaults][nold] have been [turned
8911 on][nold2] after a cycle of warnings about the change.
8912 * There is a known [regression][lr] in how object lifetime elision is
8913 interpreted, the proper solution for which is undetermined.
8914 * The `#[prelude_import]` attribute, an internal implementation
8915 detail, was accidentally stabilized previously. [It has been put
8916 behind the `prelude_import` feature gate][pi]. This change is
8917 believed to break no existing code.
8918 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8919 [more sane for dynamically sized types][dst3]. Code that relied on
8920 the previous behavior is thought to be broken.
8921 * The `dropck` rules, which checks that destructors can't access
8922 destroyed values, [have been updated][dropck] to match the
8923 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8924 cause some previously-compiling code to no longer build.
8929 * The [new object lifetime defaults][nold] have been [turned
8930 on][nold2] after a cycle of warnings about the change.
8931 * Semicolons may [now follow types and paths in
8932 macros](https://github.com/rust-lang/rust/pull/27000).
8933 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8934 [more sane for dynamically sized types][dst3]. Code that relied on
8935 the previous behavior is not known to exist, and suspected to be
8937 * `'static` variables [may now be recursive][st].
8938 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8939 implementations correctly.
8940 * The `dropck` rules, which checks that destructors can't access
8941 destroyed values, [have been updated][dropck] to match the
8947 * The [`Duration`] API, [has been stabilized][ds], as well as the
8948 `std::time` module, which presently contains only `Duration`.
8949 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8950 * The owned C string, [`CString`], implements [`Borrow`] and the
8951 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8952 these allow C strings to be borrowed and cloned in generic code.
8953 * [`CStr`] implements [`Debug`].
8954 * [`AtomicPtr`] implements [`Debug`].
8955 * [`Error`] trait objects [can be downcast to their concrete types][e]
8956 in many common configurations, using the [`is`], [`downcast`],
8957 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8959 * Searching for substrings now [employs the two-way algorithm][search]
8960 instead of doing a naive search. This gives major speedups to a
8961 number of methods, including [`contains`][sc], [`find`][sf],
8962 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8963 [`ends_with`][sew] are also faster.
8964 * The performance of `PartialEq` for slices is [much faster][ps].
8965 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8966 is overridden and optimized by the implementations for scalars.
8967 * The [`Hasher`] trait now has a number of specialized `write_*`
8968 methods for primitive types, for efficiency.
8969 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8970 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8971 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8972 of [`std::error::Error::cause`][iec] also delegates to the inner
8974 * [`process::Child`][pc] gained the [`id`] method, which returns a
8975 `u32` representing the platform-specific process identifier.
8976 * The [`connect`] method on slices is deprecated, replaced by the new
8977 [`join`] method (note that both of these are on the *unstable*
8978 [`SliceConcatExt`] trait, but through the magic of the prelude are
8979 available to stable code anyway).
8980 * The [`Div`] operator is implemented for [`Wrapping`] types.
8981 * [`DerefMut` is implemented for `String`][dms].
8982 * Performance of SipHash (the default hasher for `HashMap`) is
8983 [better for long data][sh].
8984 * [`AtomicPtr`] implements [`Send`].
8985 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8986 are now [specialized to use uninitialized buffers for increased
8988 * Lifetime parameters of foreign functions [are now resolved
8994 * Rust can now, with some coercion, [produce programs that run on
8995 Windows XP][xp], though XP is not considered a supported platform.
8996 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8997 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8998 recommended for use in 1.3, though should be fully-functional
8999 in the [64-bit 1.4 beta][b14].
9000 * On Fedora-based systems installation will [properly configure the
9001 dynamic linker][fl].
9002 * The compiler gained many new extended error descriptions, which can
9003 be accessed with the `--explain` flag.
9004 * The `dropck` pass, which checks that destructors can't access
9005 destroyed values, [has been rewritten][dropck]. This fixes some
9006 soundness holes, and as such will cause some previously-compiling
9007 code to no longer build.
9008 * `rustc` now uses [LLVM to write archive files where possible][ar].
9009 Eventually this will eliminate the compiler's dependency on the ar
9011 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
9012 supported FreeBSD on x86_64).
9013 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9014 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9016 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9017 will kill the process instead of leaking][nlp].
9019 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9020 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9021 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9022 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9023 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9024 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9025 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9026 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9027 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9028 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9029 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9030 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9031 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9032 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9033 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9034 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9035 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9036 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9037 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9038 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9039 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9040 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9041 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9042 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9043 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9044 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9045 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9046 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9047 [ar]: https://github.com/rust-lang/rust/pull/26926
9048 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9049 [dms]: https://github.com/rust-lang/rust/pull/26241
9050 [dropck]: https://github.com/rust-lang/rust/pull/27261
9051 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9052 [ds]: https://github.com/rust-lang/rust/pull/26818
9053 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9054 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9055 [dst3]: https://github.com/rust-lang/rust/pull/27351
9056 [e]: https://github.com/rust-lang/rust/pull/24793
9057 [f]: https://github.com/rust-lang/rust/pull/26588
9058 [fb]: https://github.com/rust-lang/rust/pull/26959
9059 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9060 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9061 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9062 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9063 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9064 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9065 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9066 [lic]: https://github.com/rust-lang/rust/pull/26583
9067 [lnu]: https://github.com/rust-lang/rust/pull/27026
9068 [lr]: https://github.com/rust-lang/rust/issues/27248
9069 [lum]: https://github.com/rust-lang/rust/pull/26378
9070 [lur]: https://github.com/rust-lang/rust/pull/26783
9071 [nlp]: https://github.com/rust-lang/rust/pull/27176
9072 [nold2]: https://github.com/rust-lang/rust/pull/27045
9073 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9074 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9075 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9076 [pi]: https://github.com/rust-lang/rust/pull/26699
9077 [ps]: https://github.com/rust-lang/rust/pull/26884
9078 [rte]: https://github.com/rust-lang/rust/pull/26950
9079 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9080 [search]: https://github.com/rust-lang/rust/pull/26327
9081 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9082 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9083 [sh]: https://github.com/rust-lang/rust/pull/27280
9084 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9085 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9086 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9087 [st]: https://github.com/rust-lang/rust/pull/26630
9088 [win1]: https://github.com/rust-lang/rust/pull/26569
9089 [win2]: https://github.com/rust-lang/rust/pull/26741
9090 [win3]: https://github.com/rust-lang/rust/pull/26741
9091 [win4]: https://github.com/rust-lang/rust/pull/27210
9092 [xp]: https://github.com/rust-lang/rust/pull/26569
9094 Version 1.2.0 (2015-08-07)
9095 ==========================
9097 * ~1200 changes, numerous bugfixes
9102 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9103 like `Rc` to contain types without a fixed size, arrays and trait
9104 objects, finally enabling use of `Rc<[T]>` and completing the
9105 implementation of DST.
9106 * [Parallel codegen][parcodegen] is now working again, which can
9107 substantially speed up large builds in debug mode; It also gets
9108 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9109 jobs). It's not enabled by default, but will be "in the near
9110 future". It can be activated with the `-C codegen-units=N` flag to
9112 * This is the first release with [experimental support for linking
9113 with the MSVC linker and lib C on Windows (instead of using the GNU
9114 variants via MinGW)][win]. It is yet recommended only for the most
9115 intrepid Rustaceans.
9116 * Benchmark compilations are showing a 30% improvement in
9117 bootstrapping over 1.1.
9122 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9123 unicode case mapping, which is a previously-planned change in
9124 behavior and considered a bugfix.
9125 * [`mem::align_of`] now specifies [the *minimum alignment* for
9126 T][align], which is usually the alignment programs are interested
9127 in, and the same value reported by clang's
9128 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9130 * [The `#[packed]` attribute is no longer silently accepted by the
9131 compiler][packed]. This attribute did nothing and code that
9132 mentioned it likely did not work as intended.
9133 * Associated type defaults are [now behind the
9134 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9135 defaults *did not work*, but could be mentioned syntactically. As
9136 such this breakage has minimal impact.
9141 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9142 matching against dereferenceable values.
9147 * The [`Extend`] trait, which grows a collection from an iterator, is
9148 implemented over iterators of references, for `String`, `Vec`,
9149 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9150 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9151 * The [`iter::once`] function returns an iterator that yields a single
9152 element, and [`iter::empty`] returns an iterator that yields no
9154 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9155 over substring matches.
9156 * [`Cell`] and [`RefCell`] both implement `Eq`.
9157 * A number of methods for wrapping arithmetic are added to the
9158 integral types, [`wrapping_div`], [`wrapping_rem`],
9159 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9160 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9161 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9162 type.. It is illegal for the default arithmetic operations in Rust
9163 to overflow; the desire to wrap must be explicit.
9164 * The `{:#?}` formatting specifier [displays the alternate,
9165 pretty-printed][debugfmt] form of the `Debug` formatter. This
9166 feature was actually introduced prior to 1.0 with little
9168 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9169 for writing data to formatted strings, similar to [`io::Write`].
9170 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9171 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9172 are used by code generators to emit implementations of [`Debug`].
9173 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9174 methods that convert case, following Unicode case mapping.
9175 * It is now easier to handle poisoned locks. The [`PoisonError`]
9176 type, returned by failing lock operations, exposes `into_inner`,
9177 `get_ref`, and `get_mut`, which all give access to the inner lock
9178 guard, and allow the poisoned lock to continue to operate. The
9179 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9180 poisoned lock without attempting to take the lock.
9181 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9182 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9183 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9184 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9186 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9192 * `rustc` employs smarter heuristics for guessing at [typos].
9193 * `rustc` emits more efficient code for [no-op conversions between
9194 unsafe pointers][nop].
9195 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9196 resulting in faster compile times and smaller code.
9198 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9199 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9200 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9201 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9202 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9203 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9204 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9205 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9206 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9207 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9208 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9209 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9210 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9211 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9212 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9213 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9214 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9215 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9216 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9217 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9218 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9219 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9220 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9221 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9222 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9223 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9224 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9225 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9226 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9227 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9228 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9229 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9230 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9231 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9232 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9233 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9234 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9235 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9236 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9237 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9238 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9239 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9240 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9241 [align]: https://github.com/rust-lang/rust/pull/25646
9242 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9243 [typos]: https://github.com/rust-lang/rust/pull/26087
9244 [nop]: https://github.com/rust-lang/rust/pull/26336
9245 [fat]: https://github.com/rust-lang/rust/pull/26411
9246 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9247 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9248 [packed]: https://github.com/rust-lang/rust/pull/25541
9249 [ad]: https://github.com/rust-lang/rust/pull/27382
9250 [win]: https://github.com/rust-lang/rust/pull/25350
9252 Version 1.1.0 (2015-06-25)
9253 =========================
9255 * ~850 changes, numerous bugfixes
9260 * The [`std::fs` module has been expanded][fs] to expand the set of
9261 functionality exposed:
9262 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9263 don't incur a syscall on some platforms.
9264 * A `symlink_metadata` function has been added.
9265 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9266 access to all underlying information.
9267 * The compiler now contains extended explanations of many errors. When an error
9268 with an explanation occurs the compiler suggests using the `--explain` flag
9269 to read the explanation. Error explanations are also [available online][err-index].
9270 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9271 well as other work, the time to bootstrap the compiler decreased by
9277 * The [`str::split_whitespace`] method splits a string on unicode
9278 whitespace boundaries.
9279 * On both Windows and Unix, new extension traits provide conversion of
9280 I/O types to and from the underlying system handles. On Unix, these
9281 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9282 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9283 `TcpListener`, and `UpdSocket`. Further implementations for
9284 `std::process` will be stabilized later.
9285 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9286 Windows, symlinks can be created with
9287 `std::os::windows::symlink_dir` and
9288 `std::os::windows::symlink_file`.
9289 * The `mpsc::Receiver` type can now be converted into an iterator with
9290 `into_iter` on the [`IntoIterator`] trait.
9291 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9292 implementation of the [`From`] trait.
9293 * The `Debug` implementation for `RangeFull` [creates output that is
9294 more consistent with other implementations][rf].
9295 * [`Debug` is implemented for `File`][file].
9296 * The `Default` implementation for `Arc` [no longer requires `Sync +
9298 * [The `Iterator` methods `count`, `nth`, and `last` have been
9299 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9300 * Incorrect handling of paths on Windows has been improved in both the
9301 compiler and the standard library.
9302 * [`AtomicPtr` gained a `Default` implementation][ap].
9303 * In accordance with Rust's policy on arithmetic overflow `abs` now
9304 [panics on overflow when debug assertions are enabled][abs].
9305 * The [`Cloned`] iterator, which was accidentally left unstable for
9306 1.0 [has been stabilized][c].
9307 * The [`Incoming`] iterator, which iterates over incoming TCP
9308 connections, and which was accidentally unnamable in 1.0, [is now
9309 properly exported][inc].
9310 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9311 `sift_up` or `sift_down` panic][bh].
9312 * The [`split_off`] method of `LinkedList` [no longer corrupts
9313 the list in certain scenarios][ll].
9318 * Type checking performance [has improved notably][sk] with
9319 [multiple improvements][pre].
9320 * The compiler [suggests code changes][ch] for more errors.
9321 * rustc and it's build system have experimental support for [building
9322 toolchains against MUSL][m] instead of glibc on Linux.
9323 * The compiler defines the `target_env` cfg value, which is used for
9324 distinguishing toolchains that are otherwise for the same
9325 platform. Presently this is set to `gnu` for common GNU Linux
9326 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9327 * The [`cargo rustc`][crc] command invokes a build with custom flags
9329 * [Android executables are always position independent][pie].
9330 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9333 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9334 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9335 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9336 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9337 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9338 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9339 [rf]: https://github.com/rust-lang/rust/pull/24491
9340 [err-index]: https://doc.rust-lang.org/error-index.html
9341 [sk]: https://github.com/rust-lang/rust/pull/24615
9342 [pre]: https://github.com/rust-lang/rust/pull/25323
9343 [file]: https://github.com/rust-lang/rust/pull/24598
9344 [ch]: https://github.com/rust-lang/rust/pull/24683
9345 [arc]: https://github.com/rust-lang/rust/pull/24695
9346 [si]: https://github.com/rust-lang/rust/pull/24701
9347 [ap]: https://github.com/rust-lang/rust/pull/24834
9348 [m]: https://github.com/rust-lang/rust/pull/24777
9349 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9350 [crc]: https://github.com/rust-lang/cargo/pull/1568
9351 [pie]: https://github.com/rust-lang/rust/pull/24953
9352 [abs]: https://github.com/rust-lang/rust/pull/25441
9353 [c]: https://github.com/rust-lang/rust/pull/25496
9354 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9355 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9356 [inc]: https://github.com/rust-lang/rust/pull/25522
9357 [bh]: https://github.com/rust-lang/rust/pull/25856
9358 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9359 [ll]: https://github.com/rust-lang/rust/pull/26022
9360 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9361 [drop]: https://github.com/rust-lang/rust/pull/24935
9363 Version 1.0.0 (2015-05-15)
9364 ========================
9366 * ~1500 changes, numerous bugfixes
9371 * The vast majority of the standard library is now `#[stable]`. It is
9372 no longer possible to use unstable features with a stable build of
9374 * Many popular crates on [crates.io] now work on the stable release
9376 * Arithmetic on basic integer types now [checks for overflow in debug
9382 * Several [restrictions have been added to trait coherence][coh] in
9383 order to make it easier for upstream authors to change traits
9384 without breaking downstream code.
9385 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9386 improve error messages and macro behavior. For example, `0b1234` is
9387 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9388 * Trait bounds [are always invariant][inv], eliminating the need for
9389 the `PhantomFn` and `MarkerTrait` lang items, which have been
9391 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9392 "foo" as bar` syntax has been replaced with `extern crate foo as
9393 bar`, and Cargo now automatically translates "-" in *package* names
9394 to underscore for the crate name.
9395 * [Lifetime shadowing is an error][lt].
9396 * [`Send` no longer implies `'static`][send-rfc].
9397 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9398 `MyType::default()`.
9399 * Primitive types [now have inherent methods][prim-inherent],
9400 obviating the need for extension traits like `SliceExt`.
9401 * Methods with `Self: Sized` in their `where` clause are [considered
9402 object-safe][self-sized], allowing many extension traits like
9403 `IteratorExt` to be merged into the traits they extended.
9404 * You can now [refer to associated types][assoc-where] whose
9405 corresponding trait bounds appear only in a `where` clause.
9406 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9407 like `Send` and `Sync` are now library-defined.
9408 * A [Reflect trait][reflect] was introduced, which means that
9409 downcasting via the `Any` trait is effectively limited to concrete
9410 types. This helps retain the potentially-important "parametricity"
9411 property: generic code cannot behave differently for different type
9412 arguments except in minor ways.
9413 * The `unsafe_destructor` feature is now deprecated in favor of the
9414 [new `dropck`][dropck]. This change is a major reduction in unsafe
9420 * The `thread_local` module [has been renamed to `std::thread`][th].
9421 * The methods of `IteratorExt` [have been moved to the `Iterator`
9423 * Several traits that implement Rust's conventions for type
9424 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9425 [centralized in the `std::convert` module][con].
9426 * The `FromError` trait [was removed in favor of `From`][fe].
9427 * The basic sleep function [has moved to
9428 `std::thread::sleep_ms`][slp].
9429 * The `splitn` function now takes an `n` parameter that represents the
9430 number of items yielded by the returned iterator [instead of the
9431 number of 'splits'][spl].
9432 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9433 * [Derived implementations of `PartialOrd` now order enums according
9434 to their explicitly-assigned discriminants][po].
9435 * [Methods for searching strings are generic over `Pattern`s][pat],
9436 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9438 * [In method resolution, object methods are resolved before inherent
9440 * [`String::from_str` has been deprecated in favor of the `From` impl,
9441 `String::from`][sf].
9442 * [`io::Error` implements `Sync`][ios].
9443 * [The `words` method on `&str` has been replaced with
9444 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9446 * The new path and IO modules are complete and `#[stable]`. This
9447 was the major library focus for this cycle.
9448 * The path API was [revised][path-normalize] to normalize `.`,
9449 adjusting the tradeoffs in favor of the most common usage.
9450 * A large number of remaining APIs in `std` were also stabilized
9451 during this cycle; about 75% of the non-deprecated API surface
9453 * The new [string pattern API][string-pattern] landed, which makes
9454 the string slice API much more internally consistent and flexible.
9455 * A new set of [generic conversion traits][conversion] replaced
9456 many existing ad hoc traits.
9457 * Generic numeric traits were [completely removed][num-traits]. This
9458 was made possible thanks to inherent methods for primitive types,
9459 and the removal gives maximal flexibility for designing a numeric
9460 hierarchy in the future.
9461 * The `Fn` traits are now related via [inheritance][fn-inherit]
9462 and provide ergonomic [blanket implementations][fn-blanket].
9463 * The `Index` and `IndexMut` traits were changed to
9464 [take the index by value][index-value], enabling code like
9465 `hash_map["string"]` to work.
9466 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9467 `Copy` data is known to be `Clone` as well.
9472 * Many errors now have extended explanations that can be accessed with
9473 the `--explain` flag to `rustc`.
9474 * Many new examples have been added to the standard library
9476 * rustdoc has received a number of improvements focused on completion
9478 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9479 * Much headway was made on ecosystem-wide CI, making it possible
9480 to [compare builds for breakage][ci-compare].
9483 [crates.io]: http://crates.io
9484 [clo]: https://github.com/rust-lang/rust/pull/24034
9485 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9486 [con]: https://github.com/rust-lang/rust/pull/23875
9487 [cr]: https://github.com/rust-lang/rust/pull/23419
9488 [fe]: https://github.com/rust-lang/rust/pull/23879
9489 [ie]: https://github.com/rust-lang/rust/pull/23300
9490 [inv]: https://github.com/rust-lang/rust/pull/23938
9491 [ios]: https://github.com/rust-lang/rust/pull/24133
9492 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9493 [lt]: https://github.com/rust-lang/rust/pull/24057
9494 [meth]: https://github.com/rust-lang/rust/pull/24056
9495 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9496 [po]: https://github.com/rust-lang/rust/pull/24270
9497 [sf]: https://github.com/rust-lang/rust/pull/24517
9498 [slp]: https://github.com/rust-lang/rust/pull/23949
9499 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9500 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9501 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9502 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9503 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9504 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9505 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9506 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9507 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9508 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9509 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9510 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9511 [reflect]: https://github.com/rust-lang/rust/pull/23712
9512 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9513 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9514 [index-value]: https://github.com/rust-lang/rust/pull/23601
9515 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9516 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9517 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9518 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9519 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9520 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9523 Version 1.0.0-alpha.2 (2015-02-20)
9524 =====================================
9526 * ~1300 changes, numerous bugfixes
9530 * The various I/O modules were [overhauled][io-rfc] to reduce
9531 unnecessary abstractions and provide better interoperation with
9532 the underlying platform. The old `io` module remains temporarily
9534 * The standard library now [participates in feature gating][feat],
9535 so use of unstable libraries now requires a `#![feature(...)]`
9536 attribute. The impact of this change is [described on the
9537 forum][feat-forum]. [RFC][feat-rfc].
9541 * `for` loops [now operate on the `IntoIterator` trait][into],
9542 which eliminates the need to call `.iter()`, etc. to iterate
9543 over collections. There are some new subtleties to remember
9544 though regarding what sort of iterators various types yield, in
9545 particular that `for foo in bar { }` yields values from a move
9546 iterator, destroying the original collection. [RFC][into-rfc].
9547 * Objects now have [default lifetime bounds][obj], so you don't
9548 have to write `Box<Trait+'static>` when you don't care about
9549 storing references. [RFC][obj-rfc].
9550 * In types that implement `Drop`, [lifetimes must outlive the
9551 value][drop]. This will soon make it possible to safely
9552 implement `Drop` for types where `#[unsafe_destructor]` is now
9553 required. Read the [gorgeous RFC][drop-rfc] for details.
9554 * The fully qualified <T as Trait>::X syntax lets you set the Self
9555 type for a trait method or associated type. [RFC][ufcs-rfc].
9556 * References to types that implement `Deref<U>` now [automatically
9557 coerce to references][deref] to the dereferenced type `U`,
9558 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9559 should eliminate many unsightly uses of `&*`, as when converting
9560 from references to vectors into references to
9561 slices. [RFC][deref-rfc].
9562 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9563 `|:|`) is obsolete and closure kind is inferred from context.
9564 * [`Self` is a keyword][Self].
9568 * The `Show` and `String` formatting traits [have been
9569 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9570 their related purposes. Automatically getting a string
9571 conversion to use with `format!("{:?}", something_to_debug)` is
9572 now written `#[derive(Debug)]`.
9573 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9574 OsStr}`, provide strings in platform-specific encodings for easier
9575 interop with system APIs. [RFC][osstr-rfc].
9576 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9577 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9578 creating raw pointers.
9582 * Certain long error messages of the form 'expected foo found bar'
9583 are now [split neatly across multiple
9584 lines][multiline]. Examples in the PR.
9585 * On Unix Rust can be [uninstalled][un] by running
9586 `/usr/local/lib/rustlib/uninstall.sh`.
9587 * The `#[rustc_on_unimplemented]` attribute, requiring the
9588 'on_unimplemented' feature, lets rustc [display custom error
9589 messages when a trait is expected to be implemented for a type
9594 * Rust is tested against a [LALR grammar][lalr], which parses
9595 almost all the Rust files that rustc does.
9597 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9598 [close]: https://github.com/rust-lang/rust/pull/21843
9599 [deref]: https://github.com/rust-lang/rust/pull/21351
9600 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9601 [drop]: https://github.com/rust-lang/rust/pull/21972
9602 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9603 [feat]: https://github.com/rust-lang/rust/pull/21248
9604 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9605 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9606 [fmt]: https://github.com/rust-lang/rust/pull/21457
9607 [into]: https://github.com/rust-lang/rust/pull/20790
9608 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9609 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9610 [lalr]: https://github.com/rust-lang/rust/pull/21452
9611 [multiline]: https://github.com/rust-lang/rust/pull/19870
9612 [obj]: https://github.com/rust-lang/rust/pull/22230
9613 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9614 [onun]: https://github.com/rust-lang/rust/pull/20889
9615 [osstr]: https://github.com/rust-lang/rust/pull/21488
9616 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9617 [Self]: https://github.com/rust-lang/rust/pull/22158
9618 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9619 [un]: https://github.com/rust-lang/rust/pull/22256
9622 Version 1.0.0-alpha (2015-01-09)
9623 ==================================
9625 * ~2400 changes, numerous bugfixes
9629 * The language itself is considered feature complete for 1.0,
9630 though there will be many usability improvements and bugfixes
9631 before the final release.
9632 * Nearly 50% of the public API surface of the standard library has
9633 been declared 'stable'. Those interfaces are unlikely to change
9635 * The long-running debate over integer types has been
9636 [settled][ints]: Rust will ship with types named `isize` and
9637 `usize`, rather than `int` and `uint`, for pointer-sized
9638 integers. Guidelines will be rolled out during the alpha cycle.
9639 * Most crates that are not `std` have been moved out of the Rust
9640 distribution into the Cargo ecosystem so they can evolve
9641 separately and don't need to be stabilized as quickly, including
9642 'time', 'getopts', 'num', 'regex', and 'term'.
9643 * Documentation continues to be expanded with more API coverage, more
9644 examples, and more in-depth explanations. The guides have been
9645 consolidated into [The Rust Programming Language][trpl].
9646 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9647 * All official Rust binary installers now come with [Cargo], the
9648 Rust package manager.
9652 * Closures have been [completely redesigned][unboxed] to be
9653 implemented in terms of traits, can now be used as generic type
9654 bounds and thus monomorphized and inlined, or via an opaque
9655 pointer (boxed) as in the old system. The new system is often
9656 referred to as 'unboxed' closures.
9657 * Traits now support [associated types][assoc], allowing families
9658 of related types to be defined together and used generically in
9660 * Enum variants are [namespaced by their type names][enum].
9661 * [`where` clauses][where] provide a more versatile and attractive
9662 syntax for specifying generic bounds, though the previous syntax
9664 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9666 * Rust [no longer has a runtime][rt] of any description, and only
9667 supports OS threads, not green threads.
9668 * At long last, Rust has been overhauled for 'dynamically-sized
9669 types' ([DST]), which integrates 'fat pointers' (object types,
9670 arrays, and `str`) more deeply into the type system, making it
9672 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9673 `..j` that produce range types and which, when combined with the
9674 `Index` operator and multidispatch, leads to a convenient slice
9676 * The new range syntax revealed an ambiguity in the fixed-length
9677 array syntax, so now fixed length arrays [are written `[T;
9679 * The `Copy` trait is no longer implemented automatically. Unsafe
9680 pointers no longer implement `Sync` and `Send` so types
9681 containing them don't automatically either. `Sync` and `Send`
9682 are now 'unsafe traits' so one can "forcibly" implement them via
9683 `unsafe impl` if a type confirms to the requirements for them
9684 even though the internals do not (e.g. structs containing unsafe
9685 pointers like `Arc`). These changes are intended to prevent some
9686 footguns and are collectively known as [opt-in built-in
9687 traits][oibit] (though `Sync` and `Send` will soon become pure
9688 library types unknown to the compiler).
9689 * Operator traits now take their operands [by value][ops], and
9690 comparison traits can use multidispatch to compare one type
9691 against multiple other types, allowing e.g. `String` to be
9692 compared with `&str`.
9693 * `if let` and `while let` are no longer feature-gated.
9694 * Rust has adopted a more [uniform syntax for escaping unicode
9695 characters][unicode].
9696 * `macro_rules!` [has been declared stable][mac]. Though it is a
9697 flawed system it is sufficiently popular that it must be usable
9698 for 1.0. Effort has gone into [future-proofing][mac-future] it
9699 in ways that will allow other macro systems to be developed in
9700 parallel, and won't otherwise impact the evolution of the
9702 * The prelude has been [pared back significantly][prelude] such
9703 that it is the minimum necessary to support the most pervasive
9704 code patterns, and through [generalized where clauses][where]
9705 many of the prelude extension traits have been consolidated.
9706 * Rust's rudimentary reflection [has been removed][refl], as it
9707 incurred too much code generation for little benefit.
9708 * [Struct variants][structvars] are no longer feature-gated.
9709 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9710 known as 'higher-ranked trait bounds', this crucially allows
9711 unboxed closures to work.
9712 * Macros invocations surrounded by parens or square brackets and
9713 not terminated by a semicolon are [parsed as
9714 expressions][macros], which makes expressions like `vec![1i32,
9715 2, 3].len()` work as expected.
9716 * Trait objects now implement their traits automatically, and
9717 traits that can be coerced to objects now must be [object
9719 * Automatically deriving traits is now done with `#[derive(...)]`
9720 not `#[deriving(...)]` for [consistency with other naming
9721 conventions][derive].
9722 * Importing the containing module or enum at the same time as
9723 items or variants they contain is [now done with `self` instead
9724 of `mod`][self], as in use `foo::{self, bar}`
9725 * Glob imports are no longer feature-gated.
9726 * The `box` operator and `box` patterns have been feature-gated
9727 pending a redesign. For now unique boxes should be allocated
9728 like other containers, with `Box::new`.
9732 * A [series][coll1] of [efforts][coll2] to establish
9733 [conventions][coll3] for collections types has resulted in API
9734 improvements throughout the standard library.
9735 * New [APIs for error handling][err] provide ergonomic interop
9736 between error types, and [new conventions][err-conv] describe
9737 more clearly the recommended error handling strategies in Rust.
9738 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9739 it is easier to discuss failure in the context of error handling
9740 without making clarifications as to whether you are referring to
9741 the 'fail' macro or failure more generally.
9742 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9743 syscall when available.
9744 * The 'serialize' crate has been renamed 'rustc-serialize' and
9745 moved out of the distribution to Cargo. Although it is widely
9746 used now, it is expected to be superseded in the near future.
9747 * The `Show` formatter, typically implemented with
9748 `#[derive(Show)]` is [now requested with the `{:?}`
9749 specifier][show] and is intended for use by all types, for uses
9750 such as `println!` debugging. The new `String` formatter must be
9751 implemented by hand, uses the `{}` specifier, and is intended
9752 for full-fidelity conversions of things that can logically be
9753 represented as strings.
9757 * [Flexible target specification][flex] allows rustc's code
9758 generation to be configured to support otherwise-unsupported
9760 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9761 respective debuggers with Rust-appropriate pretty-printing.
9762 * The Windows installation of Rust is distributed with the
9763 MinGW components currently required to link binaries on that
9768 * Nullable enum optimizations have been extended to more types so
9769 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9770 space than the inner types themselves.
9771 * Work has begun on supporting AArch64.
9773 [Cargo]: https://crates.io
9774 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9775 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9776 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9777 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9778 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9779 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9780 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9781 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9782 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9783 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9784 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9785 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9786 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9787 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9788 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9789 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9790 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9791 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9792 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9793 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9794 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9795 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9796 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9797 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9798 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9799 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9800 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9801 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9802 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9803 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9804 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9805 [trpl]: https://doc.rust-lang.org/book/index.html
9806 [rbe]: http://rustbyexample.com/
9809 Version 0.12.0 (2014-10-09)
9810 =============================
9812 * ~1900 changes, numerous bugfixes
9816 * The introductory documentation (now called The Rust Guide) has
9817 been completely rewritten, as have a number of supplementary
9819 * Rust's package manager, Cargo, continues to improve and is
9820 sometimes considered to be quite awesome.
9821 * Many API's in `std` have been reviewed and updated for
9822 consistency with the in-development Rust coding
9823 guidelines. The standard library documentation tracks
9824 stabilization progress.
9825 * Minor libraries have been moved out-of-tree to the rust-lang org
9826 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9827 be installed with Cargo.
9828 * Lifetime elision allows lifetime annotations to be left off of
9829 function declarations in many common scenarios.
9830 * Rust now works on 64-bit Windows.
9833 * Indexing can be overloaded with the `Index` and `IndexMut`
9835 * The `if let` construct takes a branch only if the `let` pattern
9836 matches, currently behind the 'if_let' feature gate.
9837 * 'where clauses', a more flexible syntax for specifying trait
9838 bounds that is more aesthetic, have been added for traits and
9839 free functions. Where clauses will in the future make it
9840 possible to constrain associated types, which would be
9841 impossible with the existing syntax.
9842 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9843 the 'slicing_syntax' feature gate, and can be overloaded with
9844 the `Slice` or `SliceMut` traits.
9845 * The syntax for matching of sub-slices has been changed to use a
9846 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9847 consistency with other uses of `..` and to future-proof
9848 potential additional uses of the syntax.
9849 * The syntax for matching inclusive ranges in patterns has changed
9850 from `0..3` to `0...4` to be consistent with the exclusive range
9852 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9853 c]`) has been put behind the 'advanced_slice_patterns' feature
9854 gate and may be removed in the future.
9855 * Components of tuples and tuple structs can be extracted using
9856 the `value.0` syntax, currently behind the `tuple_indexing`
9858 * The `#[crate_id]` attribute is no longer supported; versioning
9859 is handled by the package manager.
9860 * Renaming crate imports are now written `extern crate foo as bar`
9861 instead of `extern crate bar = foo`.
9862 * Renaming use statements are now written `use foo as bar` instead
9864 * `let` and `match` bindings and argument names in macros are now
9866 * The new, more efficient, closure types ('unboxed closures') have
9867 been added under a feature gate, 'unboxed_closures'. These will
9868 soon replace the existing closure types, once higher-ranked
9869 trait lifetimes are added to the language.
9870 * `move` has been added as a keyword, for indicating closures
9871 that capture by value.
9872 * Mutation and assignment is no longer allowed in pattern guards.
9873 * Generic structs and enums can now have trait bounds.
9874 * The `Share` trait is now called `Sync` to free up the term
9875 'shared' to refer to 'shared reference' (the default reference
9877 * Dynamically-sized types have been mostly implemented,
9878 unifying the behavior of fat-pointer types with the rest of the
9880 * As part of dynamically-sized types, the `Sized` trait has been
9881 introduced, which qualifying types implement by default, and
9882 which type parameters expect by default. To specify that a type
9883 parameter does not need to be sized, write `<Sized? T>`. Most
9884 types are `Sized`, notable exceptions being unsized arrays
9885 (`[T]`) and trait types.
9886 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9887 * Lifetime bounds can now be applied to type parameters and object
9889 * The old, reference counted GC type, `Gc<T>` which was once
9890 denoted by the `@` sigil, has finally been removed. GC will be
9891 revisited in the future.
9894 * Library documentation has been improved for a number of modules.
9895 * Bit-vectors, collections::bitv has been modernized.
9896 * The url crate is deprecated in favor of
9897 http://github.com/servo/rust-url, which can be installed with
9899 * Most I/O stream types can be cloned and subsequently closed from
9901 * A `std::time::Duration` type has been added for use in I/O
9902 methods that rely on timers, as well as in the 'time' crate's
9903 `Timespec` arithmetic.
9904 * The runtime I/O abstraction layer that enabled the green thread
9905 scheduler to do non-thread-blocking I/O has been removed, along
9906 with the libuv-based implementation employed by the green thread
9907 scheduler. This will greatly simplify the future I/O work.
9908 * `collections::btree` has been rewritten to have a more
9909 idiomatic and efficient design.
9912 * rustdoc output now indicates the stability levels of API's.
9913 * The `--crate-name` flag can specify the name of the crate
9914 being compiled, like `#[crate_name]`.
9915 * The `-C metadata` specifies additional metadata to hash into
9916 symbol names, and `-C extra-filename` specifies additional
9917 information to put into the output filename, for use by the
9918 package manager for versioning.
9919 * debug info generation has continued to improve and should be
9920 more reliable under both gdb and lldb.
9921 * rustc has experimental support for compiling in parallel
9922 using the `-C codegen-units` flag.
9923 * rustc no longer encodes rpath information into binaries by
9927 * Stack usage has been optimized with LLVM lifetime annotations.
9928 * Official Rust binaries on Linux are more compatible with older
9929 kernels and distributions, built on CentOS 5.10.
9932 Version 0.11.0 (2014-07-02)
9933 ==========================
9935 * ~1700 changes, numerous bugfixes
9938 * ~[T] has been removed from the language. This type is superseded by
9940 * ~str has been removed from the language. This type is superseded by
9942 * ~T has been removed from the language. This type is superseded by the
9944 * @T has been removed from the language. This type is superseded by the
9945 standard library's std::gc::Gc<T> type.
9946 * Struct fields are now all private by default.
9947 * Vector indices and shift amounts are both required to be a `uint`
9948 instead of any integral type.
9949 * Byte character, byte string, and raw byte string literals are now all
9950 supported by prefixing the normal literal with a `b`.
9951 * Multiple ABIs are no longer allowed in an ABI string
9952 * The syntax for lifetimes on closures/procedures has been tweaked
9953 slightly: `<'a>|A, B|: 'b + K -> T`
9954 * Floating point modulus has been removed from the language; however it
9955 is still provided by a library implementation.
9956 * Private enum variants are now disallowed.
9957 * The `priv` keyword has been removed from the language.
9958 * A closure can no longer be invoked through a &-pointer.
9959 * The `use foo, bar, baz;` syntax has been removed from the language.
9960 * The transmute intrinsic no longer works on type parameters.
9961 * Statics now allow blocks/items in their definition.
9962 * Trait bounds are separated from objects with + instead of : now.
9963 * Objects can no longer be read while they are mutably borrowed.
9964 * The address of a static is now marked as insignificant unless the
9965 #[inline(never)] attribute is placed it.
9966 * The #[unsafe_destructor] attribute is now behind a feature gate.
9967 * Struct literals are no longer allowed in ambiguous positions such as
9968 if, while, match, and for..in.
9969 * Declaration of lang items and intrinsics are now feature-gated by
9971 * Integral literals no longer default to `int`, and floating point
9972 literals no longer default to `f64`. Literals must be suffixed with an
9973 appropriate type if inference cannot determine the type of the
9975 * The Box<T> type is no longer implicitly borrowed to &mut T.
9976 * Procedures are now required to not capture borrowed references.
9979 * The standard library is now a "facade" over a number of underlying
9980 libraries. This means that development on the standard library should
9981 be speedier due to smaller crates, as well as a clearer line between
9983 * A new library, libcore, lives under the standard library's facade
9984 which is Rust's "0-assumption" library, suitable for embedded and
9985 kernel development for example.
9986 * A regex crate has been added to the standard distribution. This crate
9987 includes statically compiled regular expressions.
9988 * The unwrap/unwrap_err methods on Result require a Show bound for
9989 better error messages.
9990 * The return types of the std::comm primitives have been centralized
9991 around the Result type.
9992 * A number of I/O primitives have gained the ability to time out their
9994 * A number of I/O primitives have gained the ability to close their
9995 reading/writing halves to cancel pending operations.
9996 * Reverse iterator methods have been removed in favor of `rev()` on
9997 their forward-iteration counterparts.
9998 * A bitflags! macro has been added to enable easy interop with C and
9999 management of bit flags.
10000 * A debug_assert! macro is now provided which is disabled when
10001 `--cfg ndebug` is passed to the compiler.
10002 * A graphviz crate has been added for creating .dot files.
10003 * The std::cast module has been migrated into std::mem.
10004 * The std::local_data api has been migrated from freestanding functions
10005 to being based on methods.
10006 * The Pod trait has been renamed to Copy.
10007 * jemalloc has been added as the default allocator for types.
10008 * The API for allocating memory has been changed to use proper alignment
10009 and sized deallocation
10010 * Connecting a TcpStream or binding a TcpListener is now based on a
10011 string address and a u16 port. This allows connecting to a hostname as
10013 * The Reader trait now contains a core method, read_at_least(), which
10014 correctly handles many repeated 0-length reads.
10015 * The process-spawning API is now centered around a builder-style
10017 * The :? printing qualifier has been moved from the standard library to
10018 an external libdebug crate.
10019 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10020 have been renamed to Eq/Ord.
10021 * The select/plural methods have been removed from format!. The escapes
10022 for { and } have also changed from \{ and \} to {{ and }},
10024 * The TaskBuilder API has been re-worked to be a true builder, and
10025 extension traits for spawning native/green tasks have been added.
10028 * All breaking changes to the language or libraries now have their
10029 commit message annotated with `[breaking-change]` to allow for easy
10030 discovery of breaking changes.
10031 * The compiler will now try to suggest how to annotate lifetimes if a
10032 lifetime-related error occurs.
10033 * Debug info continues to be improved greatly with general bug fixes and
10034 better support for situations like link time optimization (LTO).
10035 * Usage of syntax extensions when cross-compiling has been fixed.
10036 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10037 -fdata-sections and --gc-sections has been enabled by default
10038 * The compiler is now stricter about where it will load module files
10039 from when a module is declared via `mod foo;`.
10040 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10041 Syntax extensions are now discovered via a "plugin registrar" type
10042 which will be extended in the future to other various plugins.
10043 * Lints have been restructured to allow for dynamically loadable lints.
10044 * A number of rustdoc improvements:
10045 * The HTML output has been visually redesigned.
10046 * Markdown is now powered by hoedown instead of sundown.
10047 * Searching heuristics have been greatly improved.
10048 * The search index has been reduced in size by a great amount.
10049 * Cross-crate documentation via `pub use` has been greatly improved.
10050 * Primitive types are now hyperlinked and documented.
10051 * Documentation has been moved from static.rust-lang.org/doc to
10053 * A new sandbox, play.rust-lang.org, is available for running and
10054 sharing rust code examples on-line.
10055 * Unused attributes are now more robustly warned about.
10056 * The dead_code lint now warns about unused struct fields.
10057 * Cross-compiling to iOS is now supported.
10058 * Cross-compiling to mipsel is now supported.
10059 * Stability attributes are now inherited by default and no longer apply
10060 to intra-crate usage, only inter-crate usage.
10061 * Error message related to non-exhaustive match expressions have been
10065 Version 0.10 (2014-04-03)
10066 =========================
10068 * ~1500 changes, numerous bugfixes
10071 * A new RFC process is now in place for modifying the language.
10072 * Patterns with `@`-pointers have been removed from the language.
10073 * Patterns with unique vectors (`~[T]`) have been removed from the
10075 * Patterns with unique strings (`~str`) have been removed from the
10077 * `@str` has been removed from the language.
10078 * `@[T]` has been removed from the language.
10079 * `@self` has been removed from the language.
10080 * `@Trait` has been removed from the language.
10081 * Headers on `~` allocations which contain `@` boxes inside the type for
10082 reference counting have been removed.
10083 * The semantics around the lifetimes of temporary expressions have changed,
10084 see #3511 and #11585 for more information.
10085 * Cross-crate syntax extensions are now possible, but feature gated. See
10086 #11151 for more information. This includes both `macro_rules!` macros as
10087 well as syntax extensions such as `format!`.
10088 * New lint modes have been added, and older ones have been turned on to be
10090 * Unnecessary parentheses
10091 * Uppercase statics
10093 * Uppercase variables
10094 * Publicly visible private types
10095 * `#[deriving]` with raw pointers
10096 * Unsafe functions can no longer be coerced to closures.
10097 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10098 * The `#[simd]` attribute is now behind a feature gate.
10099 * Visibility is no longer allowed on `extern crate` statements, and
10100 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10101 * Trailing commas are now allowed in argument lists and tuple patterns.
10102 * The `do` keyword has been removed, it is now a reserved keyword.
10103 * Default type parameters have been implemented, but are feature gated.
10104 * Borrowed variables through captures in closures are now considered soundly.
10105 * `extern mod` is now `extern crate`
10106 * The `Freeze` trait has been removed.
10107 * The `Share` trait has been added for types that can be shared among
10109 * Labels in macros are now hygienic.
10110 * Expression/statement macro invocations can be delimited with `{}` now.
10111 * Treatment of types allowed in `static mut` locations has been tweaked.
10112 * The `*` and `.` operators are now overloadable through the `Deref` and
10114 * `~Trait` and `proc` no longer have `Send` bounds by default.
10115 * Partial type hints are now supported with the `_` type marker.
10116 * An `Unsafe` type was introduced for interior mutability. It is now
10117 considered undefined to transmute from `&T` to `&mut T` without using the
10119 * The #[linkage] attribute was implemented for extern statics/functions.
10120 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10121 * `Pod` was renamed to `Copy`.
10124 * The `libextra` library has been removed. It has now been decomposed into
10125 component libraries with smaller and more focused nuggets of
10126 functionality. The full list of libraries can be found on the
10127 documentation index page.
10128 * std: `std::condition` has been removed. All I/O errors are now propagated
10129 through the `Result` type. In order to assist with error handling, a
10130 `try!` macro for unwrapping errors with an early return and a lint for
10131 unused results has been added. See #12039 for more information.
10132 * std: The `vec` module has been renamed to `slice`.
10133 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10134 This will become the only growable vector in the future.
10135 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10136 are now found at `std::io::BufferedReader` instead of
10137 `std::io::buffered::BufferedReader`.
10138 * std: `print` and `println` are no longer in the prelude, the `print!` and
10139 `println!` macros are intended to be used instead.
10140 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10141 attempts to statically prevent cycles.
10142 * std: The standard distribution is adopting the policy of pushing failure
10143 to the user rather than failing in libraries. Many functions (such as
10144 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10145 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10146 deriving mode: `#[deriving(Show)]`.
10147 * std: `ToStr` is now implemented for all types implementing `Show`.
10148 * std: The formatting trait methods now take `&self` instead of `&T`
10149 * std: The `invert()` method on iterators has been renamed to `rev()`
10150 * std: `std::num` has seen a reduction in the genericity of its traits,
10151 consolidating functionality into a few core traits.
10152 * std: Backtraces are now printed on task failure if the environment
10153 variable `RUST_BACKTRACE` is present.
10154 * std: Naming conventions for iterators have been standardized. More details
10155 can be found on the wiki's style guide.
10156 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10157 still implement the function.
10158 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10159 * std: `assert_approx_eq!` has been removed
10160 * std: The `e` and `E` formatting specifiers for floats have been added to
10161 print them in exponential notation.
10162 * std: The `Times` trait has been removed
10163 * std: Indications of variance and opting out of builtin bounds is done
10164 through marker types in `std::kinds::marker` now
10165 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10166 `#[deriving(Hash)]` is now possible.
10167 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10168 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10169 * std: `Chan::new` is now `channel()`.
10170 * std: A new synchronous channel type has been implemented.
10171 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10172 * std: `hashmap` and `trie` have been moved to `libcollections`
10173 * std: `run` has been rolled into `io::process`
10174 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10175 * std: The equality and comparison traits have seen some reorganization.
10176 * std: `rand` has moved to `librand`.
10177 * std: `to_{lower,upper}case` has been implemented for `char`.
10178 * std: Logging has been moved to `liblog`.
10179 * collections: `HashMap` has been rewritten for higher performance and less
10181 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10182 it can be booted manually. The runtime guide has more information and
10184 * native: All I/O functionality except signals has been implemented.
10185 * green: Task spawning with `libgreen` has been optimized with stack caching
10186 and various trimming of code.
10187 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10188 * sync: The `extra::sync` module has been updated to modern rust (and moved
10189 to the `sync` library), tweaking and improving various interfaces while
10190 dropping redundant functionality.
10191 * sync: A new `Barrier` type has been added to the `sync` library.
10192 * sync: An efficient mutex for native and green tasks has been implemented.
10193 * serialize: The `base64` module has seen some improvement. It treats
10194 newlines better, has non-string error values, and has seen general
10196 * fourcc: A `fourcc!` macro was introduced
10197 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10198 hexadecimal literal.
10201 * `rustpkg` has been deprecated and removed from the main repository. Its
10202 replacement, `cargo`, is under development.
10203 * Nightly builds of rust are now available
10204 * The memory usage of rustc has been improved many times throughout this
10206 * The build process supports disabling rpath support for the rustc binary
10208 * Code generation has improved in some cases, giving more information to the
10209 LLVM optimization passes to enable more extensive optimizations.
10210 * Debuginfo compatibility with lldb on OSX has been restored.
10211 * The master branch is now gated on an android bot, making building for
10212 android much more reliable.
10213 * Output flags have been centralized into one `--emit` flag.
10214 * Crate type flags have been centralized into one `--crate-type` flag.
10215 * Codegen flags have been consolidated behind a `-C` flag.
10216 * Linking against outdated crates now has improved error messages.
10217 * Error messages with lifetimes will often suggest how to annotate the
10218 function to fix the error.
10219 * Many more types are documented in the standard library, and new guides
10221 * Many `rustdoc` improvements:
10222 * code blocks are syntax highlighted.
10223 * render standalone markdown files.
10224 * the --test flag tests all code blocks by default.
10225 * exported macros are displayed.
10226 * re-exported types have their documentation inlined at the location of the
10228 * search works across crates that have been rendered to the same output
10232 Version 0.9 (2014-01-09)
10233 ==========================
10235 * ~1800 changes, numerous bugfixes
10238 * The `float` type has been removed. Use `f32` or `f64` instead.
10239 * A new facility for enabling experimental features (feature gating) has
10240 been added, using the crate-level `#[feature(foo)]` attribute.
10241 * Managed boxes (@) are now behind a feature gate
10242 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10243 standard library's `Gc` or `Rc` types instead.
10244 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10245 * Jumping back to the top of a loop is now done with `continue` instead of
10247 * Strings can no longer be mutated through index assignment.
10248 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10249 hash delimiters, as in `r###"foo"###`.
10250 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10252 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10253 * `@fn`s have been removed.
10254 * `do` only works with procs in order to make it obvious what the cost
10256 * Single-element tuple-like structs can no longer be dereferenced to
10257 obtain the inner value. A more comprehensive solution for overloading
10258 the dereference operator will be provided in the future.
10259 * The `#[link(...)]` attribute has been replaced with
10260 `#[crate_id = "name#vers"]`.
10261 * Empty `impl`s must be terminated with empty braces and may not be
10262 terminated with a semicolon.
10263 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10264 no longer has any special meaning.
10265 * The old `fmt!` string formatting macro has been removed.
10266 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10267 `print!` and `println!`.
10268 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10269 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10270 `extern mod foo = "bar"` instead.
10271 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10272 * Macros can have attributes.
10273 * Macros can expand to items with attributes.
10274 * Macros can expand to multiple items.
10275 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10276 * Comments may be nested.
10277 * Values automatically coerce to trait objects they implement, without
10279 * Enum discriminants are no longer an entire word but as small as needed to
10280 contain all the variants. The `repr` attribute can be used to override
10281 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10282 `#[repr(C)]` to match C enums.
10283 * Non-string literals are not allowed in attributes (they never worked).
10284 * The FFI now supports variadic functions.
10285 * Octal numeric literals, as in `0o7777`.
10286 * The `concat!` syntax extension performs compile-time string concatenation.
10287 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10288 removed as Rust no longer uses segmented stacks.
10289 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10290 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10291 not `*`; ignoring remaining fields of a struct is also done with `..`,
10292 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10293 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10294 * `rustc` supports the "system" calling convention, which defaults to the
10295 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10297 * The `type_overflow` lint (default: warn) checks literals for overflow.
10298 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10299 * The `attribute_usage` lint (default: warn) warns about unknown
10301 * The `unknown_features` lint (default: warn) warns about unknown
10303 * The `dead_code` lint (default: warn) checks for dead code.
10304 * Rust libraries can be linked statically to one another
10305 * `#[link_args]` is behind the `link_args` feature gate.
10306 * Native libraries are now linked with `#[link(name = "foo")]`
10307 * Native libraries can be statically linked to a rust crate
10308 (`#[link(name = "foo", kind = "static")]`).
10309 * Native OS X frameworks are now officially supported
10310 (`#[link(name = "foo", kind = "framework")]`).
10311 * The `#[thread_local]` attribute creates thread-local (not task-local)
10312 variables. Currently behind the `thread_local` feature gate.
10313 * The `return` keyword may be used in closures.
10314 * Types that can be copied via a memcpy implement the `Pod` kind.
10315 * The `cfg` attribute can now be used on struct fields and enum variants.
10318 * std: The `option` and `result` API's have been overhauled to make them
10319 simpler, more consistent, and more composable.
10320 * std: The entire `std::io` module has been replaced with one that is
10321 more comprehensive and that properly interfaces with the underlying
10322 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10324 * std: `io::util` contains a number of useful implementations of
10325 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10326 `ZeroReader`, `TeeReader`.
10327 * std: The reference counted pointer type `extra::rc` moved into std.
10328 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10329 just a wrapper around it).
10330 * std: The `Either` type has been removed.
10331 * std: `fmt::Default` can be implemented for any type to provide default
10332 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10333 * std: The `rand` API continues to be tweaked.
10334 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10335 on failure in gdb, is now named `rust_fail`.
10336 * std: The `each_key` and `each_value` methods on `HashMap` have been
10337 replaced by the `keys` and `values` iterators.
10338 * std: Functions dealing with type size and alignment have moved from the
10339 `sys` module to the `mem` module.
10340 * std: The `path` module was written and API changed.
10341 * std: `str::from_utf8` has been changed to cast instead of allocate.
10342 * std: `starts_with` and `ends_with` methods added to vectors via the
10343 `ImmutableEqVector` trait, which is in the prelude.
10344 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10345 if the index is out of bounds.
10346 * std: Task failure no longer propagates between tasks, as the model was
10347 complex, expensive, and incompatible with thread-based tasks.
10348 * std: The `Any` type can be used for dynamic typing.
10349 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10351 * std: Methods that produce iterators generally do not have an `_iter`
10353 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10354 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10355 * std: `util::ignore` renamed to `prelude::drop`.
10356 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10358 * std: `vec::raw` has seen a lot of cleanup and API changes.
10359 * std: The standard library no longer includes any C++ code, and very
10360 minimal C, eliminating the dependency on libstdc++.
10361 * std: Runtime scheduling and I/O functionality has been factored out into
10362 extensible interfaces and is now implemented by two different crates:
10363 libnative, for native threading and I/O; and libgreen, for green threading
10364 and I/O. This paves the way for using the standard library in more limited
10365 embedded environments.
10366 * std: The `comm` module has been rewritten to be much faster, have a
10367 simpler, more consistent API, and to work for both native and green
10369 * std: All libuv dependencies have been moved into the rustuv crate.
10370 * native: New implementations of runtime scheduling on top of OS threads.
10371 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10373 * green: The green thread scheduler and message passing types are almost
10374 entirely lock-free.
10375 * extra: The `flatpipes` module had bitrotted and was removed.
10376 * extra: All crypto functions have been removed and Rust now has a policy of
10377 not reimplementing crypto in the standard library. In the future crypto
10378 will be provided by external crates with bindings to established libraries.
10379 * extra: `c_vec` has been modernized.
10380 * extra: The `sort` module has been removed. Use the `sort` method on
10384 * The `rust` and `rusti` commands have been removed, due to lack of
10386 * `rustdoc` was completely rewritten.
10387 * `rustdoc` can test code examples in documentation.
10388 * `rustpkg` can test packages with the argument, 'test'.
10389 * `rustpkg` supports arbitrary dependencies, including C libraries.
10390 * `rustc`'s support for generating debug info is improved again.
10391 * `rustc` has better error reporting for unbalanced delimiters.
10392 * `rustc`'s JIT support was removed due to bitrot.
10393 * Executables and static libraries can be built with LTO (-Z lto)
10394 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10398 Version 0.8 (2013-09-26)
10399 ============================
10401 * ~2200 changes, numerous bugfixes
10404 * The `for` loop syntax has changed to work with the `Iterator` trait.
10405 * At long last, unwinding works on Windows.
10406 * Default methods are ready for use.
10407 * Many trait inheritance bugs fixed.
10408 * Owned and borrowed trait objects work more reliably.
10409 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10410 * rustc can omit emission of code for the `debug!` macro if it is passed
10412 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10413 for foo.rs, then foo/mod.rs, and will generate an error when both are
10415 * Strings no longer contain trailing nulls. The new `std::c_str` module
10416 provides new mechanisms for converting to C strings.
10417 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10418 * The FFI has been overhauled such that foreign functions are called directly,
10419 instead of through a stack-switching wrapper.
10420 * Calling a foreign function must be done through a Rust function with the
10421 `#[fixed_stack_segment]` attribute.
10422 * The `externfn!` macro can be used to declare both a foreign function and
10423 a `#[fixed_stack_segment]` wrapper at once.
10424 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10425 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10426 * `priv` is disallowed everywhere except for struct fields and enum variants.
10427 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10428 * `ref` bindings in irrefutable patterns work correctly now.
10429 * `char` is now prevented from containing invalid code points.
10430 * Casting to `bool` is no longer allowed.
10431 * `\0` is now accepted as an escape in chars and strings.
10432 * `yield` is a reserved keyword.
10433 * `typeof` is a reserved keyword.
10434 * Crates may be imported by URL with `extern mod foo = "url";`.
10435 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10436 * Static vectors can be initialized with repeating elements,
10437 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10438 * Static structs can be initialized with functional record update,
10439 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10440 * `cfg!` can be used to conditionally execute code based on the crate
10441 configuration, similarly to `#[cfg(...)]`.
10442 * The `unnecessary_qualification` lint detects unneeded module
10443 prefixes (default: allow).
10444 * Arithmetic operations have been implemented on the SIMD types in
10445 `std::unstable::simd`.
10446 * Exchange allocation headers were removed, reducing memory usage.
10447 * `format!` implements a completely new, extensible, and higher-performance
10448 string formatting system. It will replace `fmt!`.
10449 * `print!` and `println!` write formatted strings (using the `format!`
10450 extension) to stdout.
10451 * `write!` and `writeln!` write formatted strings (using the `format!`
10452 extension) to the new Writers in `std::rt::io`.
10453 * The library section in which a function or static is placed may
10454 be specified with `#[link_section = "..."]`.
10455 * The `proto!` syntax extension for defining bounded message protocols
10457 * `macro_rules!` is hygienic for `let` declarations.
10458 * The `#[export_name]` attribute specifies the name of a symbol.
10459 * `unreachable!` can be used to indicate unreachable code, and fails
10463 * std: Transitioned to the new runtime, written in Rust.
10464 * std: Added an experimental I/O library, `rt::io`, based on the new
10466 * std: A new generic `range` function was added to the prelude, replacing
10467 `uint::range` and friends.
10468 * std: `range_rev` no longer exists. Since range is an iterator it can be
10469 reversed with `range(lo, hi).invert()`.
10470 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10471 renamed to `unwrap_or`.
10472 * std: The `iterator` module was renamed to `iter`.
10473 * std: Integral types now support the `checked_add`, `checked_sub`, and
10474 `checked_mul` operations for detecting overflow.
10475 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10477 * std: Methods are standardizing on conventions for casting methods:
10478 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10480 * std: The `CString` type in `c_str` provides new ways to convert to and
10482 * std: `DoubleEndedIterator` can yield elements in two directions.
10483 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10485 * std: `str::from_bytes` renamed to `str::from_utf8`.
10486 * std: `pop_opt` and `shift_opt` methods added to vectors.
10487 * std: The task-local data interface no longer uses @, and keys are
10488 no longer function pointers.
10489 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10490 * std: Added `SharedPort` to `comm`.
10491 * std: `Eq` has a default method for `ne`; only `eq` is required
10492 in implementations.
10493 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10494 is required in implementations.
10495 * std: `is_utf8` performance is improved, impacting many string functions.
10496 * std: `os::MemoryMap` provides cross-platform mmap.
10497 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10498 are not 'in-bounds' are considered undefined.
10499 * std: Many freestanding functions in `vec` removed in favor of methods.
10500 * std: Many freestanding functions on scalar types removed in favor of
10502 * std: Many options to task builders were removed since they don't make
10503 sense in the new scheduler design.
10504 * std: More containers implement `FromIterator` so can be created by the
10506 * std: More complete atomic types in `unstable::atomics`.
10507 * std: `comm::PortSet` removed.
10508 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10509 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10510 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10511 default implementations.
10512 * std: Various `from_str` functions were removed in favor of a generic
10513 `from_str` which is available in the prelude.
10514 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10515 * extra: `dlist`, the doubly-linked list was modernized.
10516 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10517 * extra: Added `glob` module, replacing `std::os::glob`.
10518 * extra: `rope` was removed.
10519 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10520 * extra: `net`, and `timer` were removed. The experimental replacements
10521 are `std::rt::io::net` and `std::rt::io::timer`.
10522 * extra: Iterators implemented for `SmallIntMap`.
10523 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10524 * extra: `SmallIntSet` removed. Use `BitvSet`.
10525 * extra: Performance of JSON parsing greatly improved.
10526 * extra: `semver` updated to SemVer 2.0.0.
10527 * extra: `term` handles more terminals correctly.
10528 * extra: `dbg` module removed.
10529 * extra: `par` module removed.
10530 * extra: `future` was cleaned up, with some method renames.
10531 * extra: Most free functions in `getopts` were converted to methods.
10534 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10535 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10536 similarly to gcc's `--march` flag.
10537 * rustc's performance compiling small crates is much better.
10538 * rustpkg has received many improvements.
10539 * rustpkg supports git tags as package IDs.
10540 * rustpkg builds into target-specific directories so it can be used for
10542 * The number of concurrent test tasks is controlled by the environment
10543 variable RUST_TEST_TASKS.
10544 * The test harness can now report metrics for benchmarks.
10545 * All tools have man pages.
10546 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10547 * The runtime uses jemalloc for allocations.
10548 * Segmented stacks are temporarily disabled as part of the transition to
10549 the new runtime. Stack overflows are possible!
10550 * A new documentation backend, rustdoc_ng, is available for use. It is
10551 still invoked through the normal `rustdoc` command.
10554 Version 0.7 (2013-07-03)
10555 =======================
10557 * ~2000 changes, numerous bugfixes
10560 * `impl`s no longer accept a visibility qualifier. Put them on methods
10562 * The borrow checker has been rewritten with flow-sensitivity, fixing
10563 many bugs and inconveniences.
10564 * The `self` parameter no longer implicitly means `&'self self`,
10565 and can be explicitly marked with a lifetime.
10566 * Overloadable compound operators (`+=`, etc.) have been temporarily
10567 removed due to bugs.
10568 * The `for` loop protocol now requires `for`-iterators to return `bool`
10569 so they compose better.
10570 * The `Durable` trait is replaced with the `'static` bounds.
10571 * Trait default methods work more often.
10572 * Structs with the `#[packed]` attribute have byte alignment and
10573 no padding between fields.
10574 * Type parameters bound by `Copy` must now be copied explicitly with
10575 the `copy` keyword.
10576 * It is now illegal to move out of a dereferenced unsafe pointer.
10577 * `Option<~T>` is now represented as a nullable pointer.
10578 * `@mut` does dynamic borrow checks correctly.
10579 * The `main` function is only detected at the topmost level of the crate.
10580 The `#[main]` attribute is still valid anywhere.
10581 * Struct fields may no longer be mutable. Use inherited mutability.
10582 * The `#[no_send]` attribute makes a type that would otherwise be
10584 * The `#[no_freeze]` attribute makes a type that would otherwise be
10586 * Unbounded recursion will abort the process after reaching the limit
10587 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10588 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10589 are never implicitly copyable.
10590 * `#[static_assert]` makes compile-time assertions about static bools.
10591 * At long last, 'argument modes' no longer exist.
10592 * The rarely used `use mod` statement no longer exists.
10594 * Syntax extensions
10595 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10597 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10598 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10599 `#[deriving(...)]`.
10600 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10601 and unsuffixed integer literals.
10604 * The `core` crate was renamed to `std`.
10605 * The `std` crate was renamed to `extra`.
10606 * More and improved documentation.
10607 * std: `iterator` module for external iterator objects.
10608 * Many old-style (internal, higher-order function) iterators replaced by
10609 implementations of `Iterator`.
10610 * std: Many old internal vector and string iterators,
10611 incl. `any`, `all`. removed.
10612 * std: The `finalize` method of `Drop` renamed to `drop`.
10613 * std: The `drop` method now takes `&mut self` instead of `&self`.
10614 * std: The prelude no longer re-exports any modules, only types and traits.
10615 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10616 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10617 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10618 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10619 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10620 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10621 * std: Many types implement `Clone`.
10622 * std: `path` type renamed to `Path`.
10623 * std: `mut` module and `Mut` type removed.
10624 * std: Many standalone functions removed in favor of methods and iterators
10625 in `vec`, `str`. In the future methods will also work as functions.
10626 * std: `reinterpret_cast` removed. Use `transmute`.
10627 * std: ascii string handling in `std::ascii`.
10628 * std: `Rand` is implemented for ~/@.
10629 * std: `run` module for spawning processes overhauled.
10630 * std: Various atomic types added to `unstable::atomic`.
10631 * std: Various types implement `Zero`.
10632 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10633 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10634 * std: Added `os::mkdir_recursive`.
10635 * std: Added `os::glob` function performs filesystems globs.
10636 * std: `FuzzyEq` renamed to `ApproxEq`.
10637 * std: `Map` now defines `pop` and `swap` methods.
10638 * std: `Cell` constructors converted to static methods.
10639 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10640 * extra: `flate` module moved from `std` to `extra`.
10641 * extra: `fileinput` module for iterating over a series of files.
10642 * extra: `Complex` number type and `complex` module.
10643 * extra: `Rational` number type and `rational` module.
10644 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10645 * extra: `term` uses terminfo now, is more correct.
10646 * extra: `arc` functions converted to methods.
10647 * extra: Implementation of fixed output size variations of SHA-2.
10650 * `unused_variables` lint mode for unused variables (default: warn).
10651 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10653 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10655 * `dead_assignment` lint mode for unread variables (default: warn).
10656 * `unnecessary_allocation` lint mode detects some heap allocations that are
10657 immediately borrowed so could be written without allocating (default: warn).
10658 * `missing_doc` lint mode (default: allow).
10659 * `unreachable_code` lint mode (default: warn).
10660 * The `rusti` command has been rewritten and a number of bugs addressed.
10661 * rustc outputs in color on more terminals.
10662 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10663 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10664 * Compiling with `-g` will make the binary record information about
10665 dynamic borrowcheck failures for debugging.
10666 * rustdoc has a nicer stylesheet.
10667 * Various improvements to rustdoc.
10668 * Improvements to rustpkg (see the detailed release notes).
10671 Version 0.6 (2013-04-03)
10672 ========================
10674 * ~2100 changes, numerous bugfixes
10677 * The self type parameter in traits is now spelled `Self`
10678 * The `self` parameter in trait and impl methods must now be explicitly
10679 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10680 * Static methods no longer require the `static` keyword and instead
10681 are distinguished by the lack of a `self` parameter
10682 * Replaced the `Durable` trait with the `'static` lifetime
10683 * The old closure type syntax with the trailing sigil has been
10684 removed in favor of the more consistent leading sigil
10685 * `super` is a keyword, and may be prefixed to paths
10686 * Trait bounds are separated with `+` instead of whitespace
10687 * Traits are implemented with `impl Trait for Type`
10688 instead of `impl Type: Trait`
10689 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10690 * The `export` keyword has finally been removed
10691 * The `move` keyword has been removed (see "Semantic changes")
10692 * The interior mutability qualifier on vectors, `[mut T]`, has been
10693 removed. Use `&mut [T]`, etc.
10694 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10695 * `fail` is no longer a keyword. Use `fail!()`
10696 * `assert` is no longer a keyword. Use `assert!()`
10697 * `log` is no longer a keyword. use `debug!`, etc.
10698 * 1-tuples may be represented as `(T,)`
10699 * Struct fields may no longer be `mut`. Use inherited mutability,
10700 `@mut T`, `core::mut` or `core::cell`
10701 * `extern mod { ... }` is no longer valid syntax for foreign
10702 function modules. Use extern blocks: `extern { ... }`
10703 * Newtype enums removed. Use tuple-structs.
10704 * Trait implementations no longer support visibility modifiers
10705 * Pattern matching over vectors improved and expanded
10706 * `const` renamed to `static` to correspond to lifetime name,
10707 and make room for future `static mut` unsafe mutable globals.
10708 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10709 * `Clone` implementations can be automatically generated with
10710 `#[deriving(Clone)]`
10711 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10712 instead of `foo as Bar`.
10713 * Fixed length vector types are now written as `[int, .. 3]`
10714 instead of `[int * 3]`.
10715 * Fixed length vector types can express the length as a constant
10716 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10719 * Types with owned pointers or custom destructors move by default,
10720 eliminating the `move` keyword
10721 * All foreign functions are considered unsafe
10722 * &mut is now unaliasable
10723 * Writes to borrowed @mut pointers are prevented dynamically
10725 * The name of the main function can be customized using #[main]
10726 * The default type of an inferred closure is &fn instead of @fn
10727 * `use` statements may no longer be "chained" - they cannot import
10728 identifiers imported by previous `use` statements
10729 * `use` statements are crate relative, importing from the "top"
10730 of the crate by default. Paths may be prefixed with `super::`
10731 or `self::` to change the search behavior.
10732 * Method visibility is inherited from the implementation declaration
10733 * Structural records have been removed
10734 * Many more types can be used in static items, including enums
10735 'static-lifetime pointers and vectors
10736 * Pattern matching over vectors improved and expanded
10737 * Typechecking of closure types has been overhauled to
10738 improve inference and eliminate unsoundness
10739 * Macros leave scope at the end of modules, unless that module is
10740 tagged with #[macro_escape]
10743 * Added big integers to `std::bigint`
10744 * Removed `core::oldcomm` module
10745 * Added pipe-based `core::comm` module
10746 * Numeric traits have been reorganized under `core::num`
10747 * `vec::slice` finally returns a slice
10748 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10749 * Containers reorganized around traits in `core::container`
10750 * `core::dvec` removed, `~[T]` is a drop-in replacement
10751 * `core::send_map` renamed to `core::hashmap`
10752 * `std::map` removed; replaced with `core::hashmap`
10753 * `std::treemap` reimplemented as an owned balanced tree
10754 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10755 * `core::trie` added as a fast ordered map for integer keys
10756 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10757 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10758 overload the comparison operators, whereas `TotalOrd` is used
10759 by certain container types
10762 * Replaced the 'cargo' package manager with 'rustpkg'
10763 * Added all-purpose 'rust' tool
10764 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10765 * rustc now *attempts* to offer spelling suggestions
10766 * Improved support for ARM and Android
10767 * Preliminary MIPS backend
10768 * Improved foreign function ABI implementation for x86, x86_64
10769 * Various memory usage improvements
10770 * Rust code may be embedded in foreign code under limited circumstances
10771 * Inline assembler supported by new asm!() syntax extension.
10774 Version 0.5 (2012-12-21)
10775 ===========================
10777 * ~900 changes, numerous bugfixes
10780 * Removed `<-` move operator
10781 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10782 * Removed old fixed length vector syntax - `[T]/N`
10783 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10784 * Macros may now expand to items and statements
10785 * `a.b()` is always parsed as a method call, never as a field projection
10786 * `Eq` and `IterBytes` implementations can be automatically generated
10787 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10788 * Removed the special crate language for `.rc` files
10789 * Function arguments may consist of any irrefutable pattern
10792 * `&` and `~` pointers may point to objects
10793 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10794 * Enum variants may be structs
10795 * Destructors can be added to all nominal types with the Drop trait
10796 * Structs and nullary enum variants may be constants
10797 * Values that cannot be implicitly copied are now automatically moved
10798 without writing `move` explicitly
10799 * `&T` may now be coerced to `*T`
10800 * Coercions happen in `let` statements as well as function calls
10801 * `use` statements now take crate-relative paths
10802 * The module and type namespaces have been merged so that static
10803 method names can be resolved under the trait in which they are
10806 * Improved support for language features
10807 * Trait inheritance works in many scenarios
10808 * More support for explicit self arguments in methods - `self`, `&self`
10809 `@self`, and `~self` all generally work as expected
10810 * Static methods work in more situations
10811 * Experimental: Traits may declare default methods for the implementations
10815 * New condition handling system in `core::condition`
10816 * Timsort added to `std::sort`
10817 * New priority queue, `std::priority_queue`
10818 * Pipes for serializable types, `std::flatpipes'
10819 * Serialization overhauled to be trait-based
10820 * Expanded `getopts` definitions
10821 * Moved futures to `std`
10822 * More functions are pure now
10823 * `core::comm` renamed to `oldcomm`. Still deprecated
10824 * `rustdoc` and `cargo` are libraries now
10827 * Added a preliminary REPL, `rusti`
10828 * License changed from MIT to dual MIT/APL2
10831 Version 0.4 (2012-10-15)
10832 ==========================
10834 * ~2000 changes, numerous bugfixes
10837 * All keywords are now strict and may not be used as identifiers anywhere
10838 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10839 'of', 'with', 'to', 'class'.
10840 * Classes are replaced with simpler structs
10841 * Explicit method self types
10842 * `ret` became `return` and `alt` became `match`
10843 * `import` is now `use`; `use is now `extern mod`
10844 * `extern mod { ... }` is now `extern { ... }`
10845 * `use mod` is the recommended way to import modules
10846 * `pub` and `priv` replace deprecated export lists
10847 * The syntax of `match` pattern arms now uses fat arrow (=>)
10848 * `main` no longer accepts an args vector; use `os::args` instead
10851 * Trait implementations are now coherent, ala Haskell typeclasses
10852 * Trait methods may be static
10853 * Argument modes are deprecated
10854 * Borrowed pointers are much more mature and recommended for use
10855 * Strings and vectors in the static region are stored in constant memory
10856 * Typestate was removed
10857 * Resolution rewritten to be more reliable
10858 * Support for 'dual-mode' data structures (freezing and thawing)
10861 * Most binary operators can now be overloaded via the traits in
10863 * `std::net::url` for representing URLs
10864 * Sendable hash maps in `core::send_map`
10865 * `core::task' gained a (currently unsafe) task-local storage API
10868 * An efficient new intertask communication primitive called the pipe,
10869 along with a number of higher-level channel types, in `core::pipes`
10870 * `std::arc`, an atomically reference counted, immutable, shared memory
10872 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10873 * Futures are now based on pipes and sendable
10874 * More robust linked task failure
10875 * Improved task builder API
10878 * Improved error reporting
10879 * Preliminary JIT support
10880 * Preliminary work on precise GC
10881 * Extensive architectural improvements to rustc
10882 * Begun a transition away from buggy C++-based reflection (shape) code to
10883 Rust-based (visitor) code
10884 * All hash functions and tables converted to secure, randomized SipHash
10887 Version 0.3 (2012-07-12)
10888 ========================
10890 * ~1900 changes, numerous bugfixes
10892 * New coding conveniences
10893 * Integer-literal suffix inference
10894 * Per-item control over warnings, errors
10895 * #[cfg(windows)] and #[cfg(unix)] attributes
10896 * Documentation comments
10897 * More compact closure syntax
10898 * 'do' expressions for treating higher-order functions as
10900 * *-patterns (wildcard extended to all constructor fields)
10903 * Name resolution pass and exhaustiveness checker rewritten
10904 * Region pointers and borrow checking supersede alias
10906 * Init-ness checking is now provided by a region-based liveness
10907 pass instead of the typestate pass; same for last-use analysis
10908 * Extensive work on region pointers
10910 * Experimental new language features
10911 * Slices and fixed-size, interior-allocated vectors
10912 * #!-comments for lang versioning, shell execution
10913 * Destructors and iface implementation for classes;
10914 type-parameterized classes and class methods
10915 * 'const' type kind for types that can be used to implement
10916 shared-memory concurrency patterns
10920 * Removal of various obsolete features
10921 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10922 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10924 * Constructs: do-while loops ('do' repurposed), fn binding,
10925 resources (replaced by destructors)
10927 * Compiler reorganization
10928 * Syntax-layer of compiler split into separate crate
10929 * Clang (from LLVM project) integrated into build
10930 * Typechecker split into sub-modules
10933 * New time functions
10934 * Extension methods for many built-in types
10935 * Arc: atomic-refcount read-only / exclusive-use shared cells
10936 * Par: parallel map and search routines
10937 * Extensive work on libuv interface
10938 * Much vector code moved to libraries
10939 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10940 #include, #include_str, #include_bin
10942 * Tool improvements
10943 * Cargo automatically resolves dependencies
10946 Version 0.2 (2012-03-29)
10947 =========================
10949 * >1500 changes, numerous bugfixes
10951 * New docs and doc tooling
10953 * New port: FreeBSD x86_64
10955 * Compilation model enhancements
10956 * Generics now specialized, multiply instantiated
10957 * Functions now inlined across separate crates
10959 * Scheduling, stack and threading fixes
10960 * Noticeably improved message-passing performance
10961 * Explicit schedulers
10965 * Experimental new language features
10966 * Operator overloading
10970 * Various language extensions
10971 * C-callback function types: 'crust fn ...'
10972 * Infinite-loop construct: 'loop { ... }'
10973 * Shorten 'mutable' to 'mut'
10974 * Required mutable-local qualifier: 'let mut ...'
10975 * Basic glob-exporting: 'export foo::*;'
10976 * Alt now exhaustive, 'alt check' for runtime-checked
10977 * Block-function form of 'for' loop, with 'break' and 'ret'.
10980 * AST quasi-quote syntax extension
10981 * Revived libuv interface
10982 * New modules: core::{future, iter}, std::arena
10983 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10984 * Extensive cleanup, regularization in libstd, libcore
10987 Version 0.1 (2012-01-20)
10988 ===============================
10990 * Most language features work, including:
10991 * Unique pointers, unique closures, move semantics
10992 * Interface-constrained generics
10993 * Static interface dispatch
10995 * Multithread task scheduling
10996 * Typestate predicates
10997 * Failure unwinding, destructors
10998 * Pattern matching and destructuring assignment
10999 * Lightweight block-lambda syntax
11000 * Preliminary macro-by-example
11002 * Compiler works with the following configurations:
11003 * Linux: x86 and x86_64 hosts and targets
11004 * macOS: x86 and x86_64 hosts and targets
11005 * Windows: x86 hosts and targets
11007 * Cross compilation / multi-target configuration supported.
11009 * Preliminary API-documentation and package-management tools included.
11013 * Documentation is incomplete.
11015 * Performance is below intended target.
11017 * Standard library APIs are subject to extensive change, reorganization.
11019 * Language-level versioning is not yet operational - future code will
11020 break unexpectedly.