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.
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 - [`NonZero{unsigned}::is_power_of_two`]
46 These APIs are now usable in const contexts:
49 - [`Duration::checked_add`]
50 - [`Duration::saturating_add`]
51 - [`Duration::checked_sub`]
52 - [`Duration::saturating_sub`]
53 - [`Duration::checked_mul`]
54 - [`Duration::saturating_mul`]
55 - [`Duration::checked_div`]
56 - [`Duration::as_secs_f64`]
57 - [`Duration::as_secs_f32`]
58 - [`Duration::from_secs_f64`]
59 - [`Duration::from_secs_f32`]
60 - [`Duration::mul_f64`]
61 - [`Duration::mul_f32`]
62 - [`Duration::div_f64`]
63 - [`Duration::div_f32`]
64 - [`Duration::div_duration_f64`]
65 - [`Duration::div_duration_f32`]
66 - [`MaybeUninit::as_ptr`]
67 - [`MaybeUninit::as_mut_ptr`]
68 - [`MaybeUninit::assume_init`]
69 - [`MaybeUninit::assume_init_ref`]
74 - [Add --message-format for install command][cargo/10107]
75 - [Warn when alias shadows external subcommand][cargo/10082]
80 - [Show all Deref implementations recursively in rustdoc][90183]
81 - [Use computed visibility in rustdoc][88447]
86 - [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.
87 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
88 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
89 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
90 - [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.
91 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
96 These changes provide no direct user facing benefits, but represent significant
97 improvements to the internals and overall performance of rustc
100 - [Implement coherence checks for negative trait impls][90104]
101 - [Add rustc lint, warning when iterating over hashmaps][89558]
102 - [Optimize live point computation][90491]
103 - [Enable verification for 1/32nd of queries loaded from disk][90361]
104 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
106 [87337]: https://github.com/rust-lang/rust/pull/87337/
107 [87467]: https://github.com/rust-lang/rust/pull/87467/
108 [87704]: https://github.com/rust-lang/rust/pull/87704/
109 [88041]: https://github.com/rust-lang/rust/pull/88041/
110 [88300]: https://github.com/rust-lang/rust/pull/88300/
111 [88447]: https://github.com/rust-lang/rust/pull/88447/
112 [88601]: https://github.com/rust-lang/rust/pull/88601/
113 [88624]: https://github.com/rust-lang/rust/pull/88624/
114 [89062]: https://github.com/rust-lang/rust/pull/89062/
115 [89174]: https://github.com/rust-lang/rust/pull/89174/
116 [89542]: https://github.com/rust-lang/rust/pull/89542/
117 [89551]: https://github.com/rust-lang/rust/pull/89551/
118 [89558]: https://github.com/rust-lang/rust/pull/89558/
119 [89580]: https://github.com/rust-lang/rust/pull/89580/
120 [89652]: https://github.com/rust-lang/rust/pull/89652/
121 [89677]: https://github.com/rust-lang/rust/pull/89677/
122 [89951]: https://github.com/rust-lang/rust/pull/89951/
123 [90058]: https://github.com/rust-lang/rust/pull/90058/
124 [90104]: https://github.com/rust-lang/rust/pull/90104/
125 [90117]: https://github.com/rust-lang/rust/pull/90117/
126 [90175]: https://github.com/rust-lang/rust/pull/90175/
127 [90183]: https://github.com/rust-lang/rust/pull/90183/
128 [90297]: https://github.com/rust-lang/rust/pull/90297/
129 [90329]: https://github.com/rust-lang/rust/pull/90329/
130 [90361]: https://github.com/rust-lang/rust/pull/90361/
131 [90417]: https://github.com/rust-lang/rust/pull/90417/
132 [90473]: https://github.com/rust-lang/rust/pull/90473/
133 [90491]: https://github.com/rust-lang/rust/pull/90491/
134 [90733]: https://github.com/rust-lang/rust/pull/90733/
135 [90833]: https://github.com/rust-lang/rust/pull/90833/
136 [90846]: https://github.com/rust-lang/rust/pull/90846/
137 [90896]: https://github.com/rust-lang/rust/pull/90896/
138 [91026]: https://github.com/rust-lang/rust/pull/91026/
139 [91207]: https://github.com/rust-lang/rust/pull/91207/
140 [91255]: https://github.com/rust-lang/rust/pull/91255/
141 [91301]: https://github.com/rust-lang/rust/pull/91301/
142 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
143 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
144 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
145 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
146 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
147 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
148 [`NonZero{unsigned}::is_power_of_two`]: https://doc.rust-lang.org/stable/std/num/struct.NonZeroU8.html#method.is_power_of_two
149 [`unix::process::ExitStatusExt::core_dumped`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.core_dumped
150 [`unix::process::ExitStatusExt::stopped_signal`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.stopped_signal
151 [`unix::process::ExitStatusExt::continued`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.continued
152 [`unix::process::ExitStatusExt::into_raw`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.into_raw
153 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
154 [`Duration::checked_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_add
155 [`Duration::saturating_add`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_add
156 [`Duration::checked_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_sub
157 [`Duration::saturating_sub`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_sub
158 [`Duration::checked_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_mul
159 [`Duration::saturating_mul`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.saturating_mul
160 [`Duration::checked_div`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.checked_div
161 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f64
162 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.as_secs_f32
163 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f64
164 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.from_secs_f32
165 [`Duration::mul_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f64
166 [`Duration::mul_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.mul_f32
167 [`Duration::div_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f64
168 [`Duration::div_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f32
169 [`Duration::div_duration_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f64
170 [`Duration::div_duration_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f32
171 [`MaybeUninit::as_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
172 [`MaybeUninit::as_mut_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_mut_ptr
173 [`MaybeUninit::assume_init`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
174 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
176 Version 1.57.0 (2021-12-02)
177 ==========================
182 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
183 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
184 - [Allow panicking in constant evaluation.][89508]
189 - [Create more accurate debuginfo for vtables.][89597]
190 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
191 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
192 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
193 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
195 \* Refer to Rust's [platform support page][platform-support-doc] for more
196 information on Rust's tiered platform support.
201 - [Avoid allocations and copying in `Vec::leak`][89337]
202 - [Add `#[repr(i8)]` to `Ordering`][89507]
203 - [Optimize `File::read_to_end` and `read_to_string`][89582]
204 - [Update to Unicode 14.0][89614]
205 - [Many more functions are marked `#[must_use]`][89692], producing a warning
206 when ignoring their return value. This helps catch mistakes such as expecting
207 a function to mutate a value in place rather than return a new value.
212 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
213 - [`[T; N]::as_slice`][`array::as_slice`]
214 - [`collections::TryReserveError`]
215 - [`HashMap::try_reserve`]
216 - [`HashSet::try_reserve`]
217 - [`String::try_reserve`]
218 - [`String::try_reserve_exact`]
219 - [`Vec::try_reserve`]
220 - [`Vec::try_reserve_exact`]
221 - [`VecDeque::try_reserve`]
222 - [`VecDeque::try_reserve_exact`]
223 - [`Iterator::map_while`]
225 - [`proc_macro::is_available`]
226 - [`Command::get_program`]
227 - [`Command::get_args`]
228 - [`Command::get_envs`]
229 - [`Command::get_current_dir`]
233 These APIs are now usable in const contexts:
235 - [`hint::unreachable_unchecked`]
240 - [Stabilize custom profiles][cargo/9943]
247 These changes provide no direct user facing benefits, but represent significant
248 improvements to the internals and overall performance of rustc
251 - [Added an experimental backend for codegen with `libgccjit`.][87260]
253 [86191]: https://github.com/rust-lang/rust/pull/86191/
254 [87220]: https://github.com/rust-lang/rust/pull/87220/
255 [87260]: https://github.com/rust-lang/rust/pull/87260/
256 [88243]: https://github.com/rust-lang/rust/pull/88243/
257 [88321]: https://github.com/rust-lang/rust/pull/88321/
258 [88529]: https://github.com/rust-lang/rust/pull/88529/
259 [88690]: https://github.com/rust-lang/rust/pull/88690/
260 [88952]: https://github.com/rust-lang/rust/pull/88952/
261 [89337]: https://github.com/rust-lang/rust/pull/89337/
262 [89507]: https://github.com/rust-lang/rust/pull/89507/
263 [89508]: https://github.com/rust-lang/rust/pull/89508/
264 [89582]: https://github.com/rust-lang/rust/pull/89582/
265 [89597]: https://github.com/rust-lang/rust/pull/89597/
266 [89614]: https://github.com/rust-lang/rust/pull/89614/
267 [89692]: https://github.com/rust-lang/rust/issues/89692/
268 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
269 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
270 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
271 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
272 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
273 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
274 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
275 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
276 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
277 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
278 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
279 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
280 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
281 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
282 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
283 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
284 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
285 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
286 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
287 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
288 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
290 Version 1.56.1 (2021-11-01)
291 ===========================
293 - New lints to detect the presence of bidirectional-override Unicode
294 codepoints in the compiled source code ([CVE-2021-42574])
296 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
298 Version 1.56.0 (2021-10-21)
299 ========================
304 - [The 2021 Edition is now stable.][rust#88100]
305 See [the edition guide][rust-2021-edition-guide] for more details.
306 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
307 - [Union field access is permitted in `const fn`.][rust#85769]
309 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
314 - [Upgrade to LLVM 13.][rust#87570]
315 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
316 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
317 - [Warnings can be forced on with `--force-warn`.][rust#87472]
318 This feature is primarily intended for usage by `cargo fix`, rather than end users.
319 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
320 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
321 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
323 \* Refer to Rust's [platform support page][platform-support-doc] for more
324 information on Rust's tiered platform support.
329 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
330 The Windows console still requires valid Unicode, but this change allows
331 splitting a UTF-8 character across multiple write calls. This allows, for
332 instance, programs that just read and write data buffers (e.g. copying a file
333 to stdout) without regard for Unicode or character boundaries.
334 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
335 For this use case, atomics scale much better under contention.
336 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
337 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
338 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
339 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
340 - [Treat invalid environment variable names as non-existent.][rust#86183]
341 Previously, the environment functions would panic if given a variable name
342 with an internal null character or equal sign (`=`). Now, these functions will
343 just treat such names as non-existent variables, since the OS cannot represent
344 the existence of a variable with such a name.
349 - [`std::os::unix::fs::chroot`]
350 - [`UnsafeCell::raw_get`]
351 - [`BufWriter::into_parts`]
352 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
353 These APIs were previously stable in `std`, but are now also available in `core`.
355 - [`String::shrink_to`]
356 - [`OsString::shrink_to`]
357 - [`PathBuf::shrink_to`]
358 - [`BinaryHeap::shrink_to`]
359 - [`VecDeque::shrink_to`]
360 - [`HashMap::shrink_to`]
361 - [`HashSet::shrink_to`]
363 These APIs are now usable in const contexts:
365 - [`std::mem::transmute`]
366 - [`[T]::first`][`slice::first`]
367 - [`[T]::split_first`][`slice::split_first`]
368 - [`[T]::last`][`slice::last`]
369 - [`[T]::split_last`][`slice::split_last`]
374 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
375 This has no effect at present on dependency version selection.
376 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
377 that support Rust code to include a crate's specified minimum version in the test matrix for that
383 - [Update to new argument parsing rules on Windows.][rust#87580]
384 This adjusts Rust's standard library to match the behavior of the standard
385 libraries for C/C++. The rules have changed slightly over time, and this PR
386 brings us to the latest set of rules (changed in 2008).
387 - [Disallow the aapcs calling convention on aarch64][rust#88399]
388 This was already not supported by LLVM; this change surfaces this lack of
389 support with a better error message.
390 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
391 - [Warn when an escaped newline skips multiple lines.][rust#87671]
392 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
393 may return different values on glibc <= 2.24.][rust#81825]
394 Rust now invokes the `clone3` system call directly, when available, to use new functionality
395 available via that system call. Older versions of glibc cache the result of `getpid`, and only
396 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
397 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
401 These changes provide no direct user facing benefits, but represent significant
402 improvements to the internals and overall performance of rustc
405 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
406 This improves the performance of most Rust builds.
407 - [Unify representation of macros in internal data structures.][rust#88019]
408 This change fixes a host of bugs with the handling of macros by the compiler,
411 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
412 [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
413 [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse
414 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
415 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
416 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
417 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
418 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
419 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
420 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
421 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
422 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
423 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
424 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
425 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
426 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
427 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
428 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
429 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
430 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
431 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
432 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
433 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
434 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
435 [rust#86860]: https://github.com/rust-lang/rust/pull/86860
436 [rust#84039]: https://github.com/rust-lang/rust/pull/84039
437 [rust#86492]: https://github.com/rust-lang/rust/pull/86492
438 [rust#88363]: https://github.com/rust-lang/rust/pull/88363
439 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
440 [rust#87832]: https://github.com/rust-lang/rust/pull/87832
441 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
442 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
443 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
444 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
445 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
446 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
447 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
448 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
449 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
450 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
451 [rust#88177]: https://github.com/rust-lang/rust/pull/88177
452 [rust#88548]: https://github.com/rust-lang/rust/pull/88548
453 [rust#88551]: https://github.com/rust-lang/rust/pull/88551
454 [rust#88299]: https://github.com/rust-lang/rust/pull/88299
455 [rust#88220]: https://github.com/rust-lang/rust/pull/88220
456 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
457 [rust#86879]: https://github.com/rust-lang/rust/pull/86879
458 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
459 [rust#84662]: https://github.com/rust-lang/rust/pull/84662
460 [rust#86593]: https://github.com/rust-lang/rust/pull/86593
461 [rust#81050]: https://github.com/rust-lang/rust/pull/81050
462 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
463 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
464 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
465 [rust#88490]: https://github.com/rust-lang/rust/pull/88490
466 [rust#88269]: https://github.com/rust-lang/rust/pull/88269
467 [rust#84176]: https://github.com/rust-lang/rust/pull/84176
468 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
469 [rust#88227]: https://github.com/rust-lang/rust/pull/88227
470 [rust#88200]: https://github.com/rust-lang/rust/pull/88200
471 [rust#82776]: https://github.com/rust-lang/rust/pull/82776
472 [rust#88077]: https://github.com/rust-lang/rust/pull/88077
473 [rust#87728]: https://github.com/rust-lang/rust/pull/87728
474 [rust#87050]: https://github.com/rust-lang/rust/pull/87050
475 [rust#87619]: https://github.com/rust-lang/rust/pull/87619
476 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
477 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
478 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
480 Version 1.55.0 (2021-09-09)
481 ============================
485 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
486 will end at the maximum value of the integer.][83918]
487 - [You can now explicitly import the prelude of different editions
488 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
492 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
494 \* Refer to Rust's [platform support page][platform-support-doc] for more
495 information on Rust's tiered platform support.
500 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
501 These improvements should in general provide faster string parsing of floats,
502 no longer reject certain valid floating point values, and reduce
503 the produced code size for non-stripped artifacts.
504 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
511 - [`IntoInnerError::into_error`]
512 - [`IntoInnerError::into_parts`]
513 - [`MaybeUninit::assume_init_mut`]
514 - [`MaybeUninit::assume_init_ref`]
515 - [`MaybeUninit::write`]
517 - [`ops::ControlFlow`]
519 - [`x86::_bittestandcomplement`]
520 - [`x86::_bittestandreset`]
521 - [`x86::_bittestandset`]
522 - [`x86_64::_bittest64`]
523 - [`x86_64::_bittestandcomplement64`]
524 - [`x86_64::_bittestandreset64`]
525 - [`x86_64::_bittestandset64`]
527 The following previously stable functions are now `const`.
529 - [`str::from_utf8_unchecked`]
534 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
535 rustc in parallel such as when using `cargo test`.][cargo/9675]
536 - [The package definition in `cargo metadata` now includes the `"default_run"`
537 field from the manifest.][cargo/9550]
538 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
539 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
540 of packages.][cargo/9663]
544 - [Added "Go to item on exact match" search option.][85876]
545 - [The "Implementors" section on traits no longer shows redundant
546 method definitions.][85970]
547 - [Trait implementations are toggled open by default.][86260] This should make the
548 implementations more searchable by tools like `CTRL+F` in your browser.
549 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
550 through type aliases.][86334]
551 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
552 "Trait Implementations" section.][86513]
557 - [std functions that return an `io::Error` will no longer use the
558 `ErrorKind::Other` variant.][85746] This is to better reflect that these
559 kinds of errors could be categorised [into newer more specific `ErrorKind`
560 variants][79965], and that they do not represent a user error.
561 - [Using environment variable names with `process::Command` on Windows now
562 behaves as expected.][85270] Previously using envionment variables with
563 `Command` would cause them to be ASCII-uppercased.
564 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
565 with `rustdoc::`][86849]
566 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
567 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
568 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
571 [86849]: https://github.com/rust-lang/rust/pull/86849
572 [86513]: https://github.com/rust-lang/rust/pull/86513
573 [86334]: https://github.com/rust-lang/rust/pull/86334
574 [86260]: https://github.com/rust-lang/rust/pull/86260
575 [85970]: https://github.com/rust-lang/rust/pull/85970
576 [85876]: https://github.com/rust-lang/rust/pull/85876
577 [83572]: https://github.com/rust-lang/rust/pull/83572
578 [86294]: https://github.com/rust-lang/rust/pull/86294
579 [86858]: https://github.com/rust-lang/rust/pull/86858
580 [86761]: https://github.com/rust-lang/rust/pull/86761
581 [85769]: https://github.com/rust-lang/rust/pull/85769
582 [85746]: https://github.com/rust-lang/rust/pull/85746
583 [85305]: https://github.com/rust-lang/rust/pull/85305
584 [85270]: https://github.com/rust-lang/rust/pull/85270
585 [84111]: https://github.com/rust-lang/rust/pull/84111
586 [83918]: https://github.com/rust-lang/rust/pull/83918
587 [79965]: https://github.com/rust-lang/rust/pull/79965
588 [87370]: https://github.com/rust-lang/rust/pull/87370
589 [87298]: https://github.com/rust-lang/rust/pull/87298
590 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
591 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
592 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
593 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
594 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
595 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
596 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
597 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
598 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
599 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
600 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
601 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
602 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
603 [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind
604 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
605 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
606 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
607 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
608 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
609 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
610 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
611 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
612 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
613 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
616 Version 1.54.0 (2021-07-29)
617 ============================
620 -----------------------
622 - [You can now use macros for values in some built-in attributes.][83366]
623 This primarily allows you to call macros within the `#[doc]` attribute. For
624 example, to include external documentation in your crate, you can now write
627 #![doc = include_str!("README.md")]
630 - [You can now cast between unsized slice types (and types which contain
631 unsized slices) in `const fn`.][85078]
632 - [You can now use multiple generic lifetimes with `impl Trait` where the
633 lifetimes don't explicitly outlive another.][84701] In code this means
634 that you can now have `impl Trait<'a, 'b>` where as before you could
635 only have `impl Trait<'a, 'b> where 'b: 'a`.
638 -----------------------
640 - [Rustc will now search for custom JSON targets in
641 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
642 directory.][83800] You can find your sysroot directory by running
643 `rustc --print sysroot`.
644 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
645 - [You can now use `#[target_feature]` on safe functions when targeting
646 WebAssembly platforms.][84988]
647 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
648 - [Added tier 3\* support for `bpfel-unknown-none`
649 and `bpfeb-unknown-none`.][79608]
650 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
652 \* Refer to Rust's [platform support page][platform-support-doc] for more
653 information on Rust's tiered platform support.
656 -----------------------
658 - [`panic::panic_any` will now `#[track_caller]`.][85745]
659 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
660 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
661 - [The implementations of vendor intrinsics in core::arch have been
662 significantly refactored.][83278] The main user-visible changes are
663 a 50% reduction in the size of libcore.rlib and stricter validation
664 of constant operands passed to intrinsics. The latter is technically
665 a breaking change, but allows Rust to more closely match the C vendor
671 - [`BTreeMap::into_keys`]
672 - [`BTreeMap::into_values`]
673 - [`HashMap::into_keys`]
674 - [`HashMap::into_values`]
676 - [`VecDeque::binary_search`]
677 - [`VecDeque::binary_search_by`]
678 - [`VecDeque::binary_search_by_key`]
679 - [`VecDeque::partition_point`]
684 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
685 the dependency graph.][cargo/9520]
686 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
687 in the tree ][cargo/9499]
688 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
689 macro dependencies.][cargo/9488]
690 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
691 This variable points to a directory that integration tests and benches
692 can use as a "scratchpad" for testing filesystem operations.
696 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
697 - [Previously unsound code is no longer permitted where different constructors in branches
698 could require different lifetimes.][85574]
699 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
700 than before and may reject some previously accepted code.
701 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
702 when compiled with `codegen-units = 1`.][86063]
704 [85574]: https://github.com/rust-lang/rust/issues/85574
705 [86831]: https://github.com/rust-lang/rust/issues/86831
706 [86063]: https://github.com/rust-lang/rust/issues/86063
707 [86831]: https://github.com/rust-lang/rust/issues/86831
708 [79608]: https://github.com/rust-lang/rust/pull/79608
709 [84988]: https://github.com/rust-lang/rust/pull/84988
710 [84701]: https://github.com/rust-lang/rust/pull/84701
711 [84072]: https://github.com/rust-lang/rust/pull/84072
712 [85745]: https://github.com/rust-lang/rust/pull/85745
713 [84744]: https://github.com/rust-lang/rust/pull/84744
714 [85078]: https://github.com/rust-lang/rust/pull/85078
715 [84717]: https://github.com/rust-lang/rust/pull/84717
716 [83800]: https://github.com/rust-lang/rust/pull/83800
717 [83366]: https://github.com/rust-lang/rust/pull/83366
718 [83278]: https://github.com/rust-lang/rust/pull/83278
719 [85292]: https://github.com/rust-lang/rust/pull/85292
720 [82834]: https://github.com/rust-lang/rust/pull/82834
721 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
722 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
723 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
724 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
725 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
726 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
727 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
728 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
729 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
730 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
731 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
733 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
735 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
737 Version 1.53.0 (2021-06-17)
738 ============================
741 -----------------------
742 - [You can now use unicode for identifiers.][83799] This allows multilingual
743 identifiers but still doesn't allow glyphs that are not considered characters
744 such as `◆` or `🦀`. More specifically you can now use any identifier that
745 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
746 is the same standard as languages like Python, however Rust uses NFC
747 normalization which may be different from other languages.
748 - [You can now specify "or patterns" inside pattern matches.][79278]
749 Previously you could only use `|` (OR) on complete patterns. E.g.
753 matches!(x, Some(1) | Some(2));
755 matches!(x, Some(1 | 2));
757 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
758 has the same semantics as the `:pat` matcher. This is to allow `:pat`
759 to change semantics to being a pattern fragment in a future edition.
762 -----------------------
763 - [Updated the minimum external LLVM version to LLVM 10.][83387]
764 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
765 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
767 \* Refer to Rust's [platform support page][platform-support-doc] for more
768 information on Rust's tiered platform support.
771 -----------------------
772 - [Abort messages will now forward to `android_set_abort_message` on
773 Android platforms when available.][81469]
774 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
775 - [Arrays of any length now implement `IntoIterator`.][84147]
776 Currently calling `.into_iter()` as a method on an array will
777 return `impl Iterator<Item=&T>`, but this may change in a
778 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
779 directly on arrays will provide `impl Iterator<Item=T>` as expected.
780 - [`leading_zeros`, and `trailing_zeros` are now available on all
781 `NonZero` integer types.][84082]
782 - [`{f32, f64}::from_str` now parse and print special values
783 (`NaN`, `-0`) according to IEEE 754.][78618]
784 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
785 - [Add the `BITS` associated constant to all numeric types.][82565]
789 - [`AtomicBool::fetch_update`]
790 - [`AtomicPtr::fetch_update`]
791 - [`BTreeMap::retain`]
792 - [`BTreeSet::retain`]
793 - [`BufReader::seek_relative`]
794 - [`DebugStruct::non_exhaustive`]
797 - [`Duration::is_zero`]
798 - [`Duration::saturating_add`]
799 - [`Duration::saturating_mul`]
800 - [`Duration::saturating_sub`]
801 - [`ErrorKind::Unsupported`]
803 - [`Ordering::is_eq`]
804 - [`Ordering::is_ge`]
805 - [`Ordering::is_gt`]
806 - [`Ordering::is_le`]
807 - [`Ordering::is_lt`]
808 - [`Ordering::is_ne`]
809 - [`OsStr::is_ascii`]
810 - [`OsStr::make_ascii_lowercase`]
811 - [`OsStr::make_ascii_uppercase`]
812 - [`OsStr::to_ascii_lowercase`]
813 - [`OsStr::to_ascii_uppercase`]
814 - [`Peekable::peek_mut`]
815 - [`Rc::decrement_strong_count`]
816 - [`Rc::increment_strong_count`]
817 - [`Vec::extend_from_within`]
818 - [`array::from_mut`]
819 - [`array::from_ref`]
820 - [`cmp::max_by_key`]
822 - [`cmp::min_by_key`]
824 - [`f32::is_subnormal`]
825 - [`f64::is_subnormal`]
828 -----------------------
829 - [Cargo now supports git repositories where the default `HEAD` branch is not
830 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
831 which can handle default branches correctly.
832 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
833 - [The `authors` field is no longer included in `Cargo.toml` for new
834 projects.][cargo/9282]
837 -----------------------
838 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
839 without hyperlinks.][81764]
843 - [Implement token-based handling of attributes during expansion][82608]
844 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
845 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
846 to confusion and potential security vulnerabilities and [is no
847 longer recommended][ietf6943].
848 - [The added `BITS` constant may conflict with external definitions.][85667]
849 In particular, this was known to be a problem in the `lexical-core` crate,
850 but they have published fixes for semantic versions 0.4 through 0.7. To
851 update this dependency alone, use `cargo update -p lexical-core`.
852 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
856 These changes provide no direct user facing benefits, but represent significant
857 improvements to the internals and overall performance of rustc and
860 - [Rework the `std::sys::windows::alloc` implementation.][83065]
861 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
862 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
863 - [Rework rustdoc const type][82873]
865 [85667]: https://github.com/rust-lang/rust/pull/85667
866 [83386]: https://github.com/rust-lang/rust/pull/83386
867 [82771]: https://github.com/rust-lang/rust/pull/82771
868 [84147]: https://github.com/rust-lang/rust/pull/84147
869 [84082]: https://github.com/rust-lang/rust/pull/84082
870 [83799]: https://github.com/rust-lang/rust/pull/83799
871 [83681]: https://github.com/rust-lang/rust/pull/83681
872 [83652]: https://github.com/rust-lang/rust/pull/83652
873 [83387]: https://github.com/rust-lang/rust/pull/83387
874 [82873]: https://github.com/rust-lang/rust/pull/82873
875 [82864]: https://github.com/rust-lang/rust/pull/82864
876 [82608]: https://github.com/rust-lang/rust/pull/82608
877 [82565]: https://github.com/rust-lang/rust/pull/82565
878 [80525]: https://github.com/rust-lang/rust/pull/80525
879 [79278]: https://github.com/rust-lang/rust/pull/79278
880 [78618]: https://github.com/rust-lang/rust/pull/78618
881 [77704]: https://github.com/rust-lang/rust/pull/77704
882 [83941]: https://github.com/rust-lang/rust/pull/83941
883 [83065]: https://github.com/rust-lang/rust/pull/83065
884 [81764]: https://github.com/rust-lang/rust/pull/81764
885 [81469]: https://github.com/rust-lang/rust/pull/81469
886 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
887 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
888 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
889 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
890 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
891 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
892 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
893 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
894 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
895 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
896 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
897 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
898 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
899 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
900 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
901 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
902 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
903 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
904 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
905 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
906 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
907 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
908 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
909 [`OsStr::eq_ignore_ascii_case`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.eq_ignore_ascii_case
910 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
911 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
912 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
913 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
914 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
915 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
916 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
917 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
918 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
919 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
920 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
921 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
922 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
923 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
924 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
925 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
926 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
927 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
930 Version 1.52.1 (2021-05-10)
931 ============================
933 This release disables incremental compilation, unless the user has explicitly
934 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
936 This is due to the widespread, and frequently occuring, breakage encountered by
937 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
938 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
939 newly added incremental verification are still present in past stable versions,
940 and are not yet fixed on any channel. These bugs can lead to miscompilation of
943 These problems only affect incremental builds, so release builds with Cargo
944 should not be affected unless the user has explicitly opted into incremental.
945 Debug and check builds are affected.
947 See [84970] for more details.
949 [84970]: https://github.com/rust-lang/rust/issues/84970
951 Version 1.52.0 (2021-05-06)
952 ============================
956 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
957 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
958 is allowed by default, and may become a warning or hard error in a
960 - [You can now cast mutable references to arrays to a pointer of the same type as
965 - [Upgraded the default LLVM to LLVM 12.][81451]
967 Added tier 3\* support for the following targets.
969 - [`s390x-unknown-linux-musl`][82166]
970 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
971 - [`powerpc-unknown-openbsd`][82733]
973 \* Refer to Rust's [platform support page][platform-support-doc] for more
974 information on Rust's tiered platform support.
978 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
979 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
980 - [`Arc<impl Error>` now implements `error::Error`.][80553]
981 - [All integer division and remainder operations are now `const`.][80962]
985 - [`Arguments::as_str`]
987 - [`char::REPLACEMENT_CHARACTER`]
988 - [`char::UNICODE_VERSION`]
989 - [`char::decode_utf16`]
990 - [`char::from_digit`]
991 - [`char::from_u32_unchecked`]
993 - [`slice::partition_point`]
994 - [`str::rsplit_once`]
995 - [`str::split_once`]
997 The following previously stable APIs are now `const`.
1000 - [`char::len_utf16`]
1001 - [`char::to_ascii_uppercase`]
1002 - [`char::to_ascii_lowercase`]
1003 - [`char::eq_ignore_ascii_case`]
1004 - [`u8::to_ascii_uppercase`]
1005 - [`u8::to_ascii_lowercase`]
1006 - [`u8::eq_ignore_ascii_case`]
1010 - [Rustdoc lints are now treated as a tool lint, meaning that
1011 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1012 Using the old style is still allowed, and will become a warning in
1014 - [Rustdoc now supports argument files.][82261]
1015 - [Rustdoc now generates smart punctuation for documentation.][79423]
1016 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1024 - [You can now pass multiple filters to tests.][81356] E.g.
1025 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1026 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1027 allowing you to see `std` symbols when debugging.][82218]
1031 These changes provide no direct user facing benefits, but represent significant
1032 improvements to the internals and overall performance of rustc and
1035 - [Check the result cache before the DepGraph when ensuring queries][81855]
1036 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1037 - [Only store a LocalDefId in some HIR nodes][81611]
1038 - [Store HIR attributes in a side table][79519]
1042 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1043 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1044 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1045 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1046 languages in code blocks.][78429]
1047 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1048 - [Changes in how proc macros handle whitespace may lead to panics when used
1049 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1050 - [Turn `#[derive]` into a regular macro attribute][79078]
1052 [84136]: https://github.com/rust-lang/rust/issues/84136
1053 [80763]: https://github.com/rust-lang/rust/pull/80763
1054 [82166]: https://github.com/rust-lang/rust/pull/82166
1055 [82121]: https://github.com/rust-lang/rust/pull/82121
1056 [81879]: https://github.com/rust-lang/rust/pull/81879
1057 [82261]: https://github.com/rust-lang/rust/pull/82261
1058 [82218]: https://github.com/rust-lang/rust/pull/82218
1059 [82216]: https://github.com/rust-lang/rust/pull/82216
1060 [82202]: https://github.com/rust-lang/rust/pull/82202
1061 [81855]: https://github.com/rust-lang/rust/pull/81855
1062 [81766]: https://github.com/rust-lang/rust/pull/81766
1063 [81744]: https://github.com/rust-lang/rust/pull/81744
1064 [81611]: https://github.com/rust-lang/rust/pull/81611
1065 [81479]: https://github.com/rust-lang/rust/pull/81479
1066 [81451]: https://github.com/rust-lang/rust/pull/81451
1067 [81356]: https://github.com/rust-lang/rust/pull/81356
1068 [80962]: https://github.com/rust-lang/rust/pull/80962
1069 [80553]: https://github.com/rust-lang/rust/pull/80553
1070 [80527]: https://github.com/rust-lang/rust/pull/80527
1071 [79519]: https://github.com/rust-lang/rust/pull/79519
1072 [79423]: https://github.com/rust-lang/rust/pull/79423
1073 [79208]: https://github.com/rust-lang/rust/pull/79208
1074 [78429]: https://github.com/rust-lang/rust/pull/78429
1075 [82733]: https://github.com/rust-lang/rust/pull/82733
1076 [82594]: https://github.com/rust-lang/rust/pull/82594
1077 [79078]: https://github.com/rust-lang/rust/pull/79078
1078 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1079 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1080 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1081 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1082 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1083 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1084 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1085 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1086 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1087 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1088 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1089 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1090 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1091 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1092 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1093 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1094 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1095 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1096 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1097 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1098 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1099 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1101 Version 1.51.0 (2021-03-25)
1102 ============================
1106 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1107 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1108 E.g. you can now write the following. Note: Only values of primitive integers,
1109 `bool`, or `char` types are currently permitted.
1111 struct GenericArray<T, const LENGTH: usize> {
1115 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1116 const fn last(&self) -> Option<&T> {
1120 Some(&self.inner[LENGTH - 1])
1130 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1131 This option controls whether debug information is split across multiple files
1132 or packed into a single file. **Note** This option is unstable on other platforms.
1133 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1134 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1135 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1136 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1138 \* Refer to Rust's [platform support page][platform-support-doc] for more
1139 information on Rust's tiered platform support.
1144 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1145 - [`str` now implements `AsMut<str>`.][80279]
1146 - [`u64` and `u128` now implement `From<char>`.][79502]
1147 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1148 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1149 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1150 - [`io::Empty` now implements `io::Seek`.][78044]
1151 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1152 `T: ?Sized` types.][80764]
1153 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1159 - [`Arc::decrement_strong_count`]
1160 - [`Arc::increment_strong_count`]
1161 - [`Once::call_once_force`]
1162 - [`Peekable::next_if_eq`]
1163 - [`Peekable::next_if`]
1164 - [`Seek::stream_position`]
1165 - [`array::IntoIter`]
1166 - [`panic::panic_any`]
1168 - [`ptr::addr_of_mut!`]
1169 - [`slice::fill_with`]
1170 - [`slice::split_inclusive_mut`]
1171 - [`slice::split_inclusive`]
1172 - [`slice::strip_prefix`]
1173 - [`slice::strip_suffix`]
1174 - [`str::split_inclusive`]
1175 - [`sync::OnceState`]
1177 - [`VecDeque::range`]
1178 - [`VecDeque::range_mut`]
1182 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1183 codegen option.][cargo/9112]
1184 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1185 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1186 to avoid unifying features of dependencies where that unification could be unwanted.
1187 Such as using the same dependency with a `std` feature in a build scripts and
1188 proc-macros, while using the `no-std` feature in the final binary. See the
1189 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1194 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1195 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1196 documentation.][79642]
1198 Various improvements to intra-doc links:
1200 - [You can link to non-path primitives such as `slice`.][80181]
1201 - [You can link to associated items.][74489]
1202 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1206 - [You can now pass `--include-ignored` to tests (e.g. with
1207 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1212 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1213 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1215 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1216 for the distributed artifacts.][81521]
1217 - `armv5te-unknown-linux-gnueabi`
1218 - `sparc64-unknown-linux-gnu`
1219 - `thumbv7neon-unknown-linux-gnueabihf`
1220 - `armv7-unknown-linux-gnueabi`
1221 - `x86_64-unknown-linux-gnux32`
1222 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1227 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1229 [79135]: https://github.com/rust-lang/rust/pull/79135
1230 [74489]: https://github.com/rust-lang/rust/pull/74489
1231 [76934]: https://github.com/rust-lang/rust/pull/76934
1232 [79570]: https://github.com/rust-lang/rust/pull/79570
1233 [80181]: https://github.com/rust-lang/rust/pull/80181
1234 [79642]: https://github.com/rust-lang/rust/pull/79642
1235 [80945]: https://github.com/rust-lang/rust/pull/80945
1236 [80279]: https://github.com/rust-lang/rust/pull/80279
1237 [80053]: https://github.com/rust-lang/rust/pull/80053
1238 [79502]: https://github.com/rust-lang/rust/pull/79502
1239 [75180]: https://github.com/rust-lang/rust/pull/75180
1240 [79135]: https://github.com/rust-lang/rust/pull/79135
1241 [81521]: https://github.com/rust-lang/rust/pull/81521
1242 [80968]: https://github.com/rust-lang/rust/pull/80968
1243 [80959]: https://github.com/rust-lang/rust/pull/80959
1244 [80718]: https://github.com/rust-lang/rust/pull/80718
1245 [80653]: https://github.com/rust-lang/rust/pull/80653
1246 [80579]: https://github.com/rust-lang/rust/pull/80579
1247 [79998]: https://github.com/rust-lang/rust/pull/79998
1248 [78044]: https://github.com/rust-lang/rust/pull/78044
1249 [81455]: https://github.com/rust-lang/rust/pull/81455
1250 [80764]: https://github.com/rust-lang/rust/pull/80764
1251 [80749]: https://github.com/rust-lang/rust/pull/80749
1252 [80662]: https://github.com/rust-lang/rust/pull/80662
1253 [79134]: https://github.com/rust-lang/rust/pull/79134
1254 [80966]: https://github.com/rust-lang/rust/pull/80966
1255 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1256 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1257 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1258 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1259 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1260 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1261 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1262 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1263 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1264 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1265 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1266 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1267 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1268 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1269 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1270 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1271 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1272 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1273 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1274 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1275 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1276 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1277 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1279 Version 1.50.0 (2021-02-11)
1280 ============================
1283 -----------------------
1284 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1285 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1286 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1289 -----------------------
1290 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1291 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1292 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1293 - [Dropped support for all cloudabi targets.][78439]
1295 \* Refer to Rust's [platform support page][platform-support-doc] for more
1296 information on Rust's tiered platform support.
1299 -----------------------
1301 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1302 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1303 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1304 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1305 up the same amount of space as `File`.
1311 - [`btree_map::Entry::or_insert_with_key`]
1314 - [`hash_map::Entry::or_insert_with_key`]
1318 - [`UnsafeCell::get_mut`]
1320 The following previously stable methods are now `const`.
1322 - [`IpAddr::is_ipv4`]
1323 - [`IpAddr::is_ipv6`]
1324 - [`IpAddr::is_unspecified`]
1325 - [`IpAddr::is_loopback`]
1326 - [`IpAddr::is_multicast`]
1327 - [`Ipv4Addr::octets`]
1328 - [`Ipv4Addr::is_loopback`]
1329 - [`Ipv4Addr::is_private`]
1330 - [`Ipv4Addr::is_link_local`]
1331 - [`Ipv4Addr::is_multicast`]
1332 - [`Ipv4Addr::is_broadcast`]
1333 - [`Ipv4Addr::is_documentation`]
1334 - [`Ipv4Addr::to_ipv6_compatible`]
1335 - [`Ipv4Addr::to_ipv6_mapped`]
1336 - [`Ipv6Addr::segments`]
1337 - [`Ipv6Addr::is_unspecified`]
1338 - [`Ipv6Addr::is_loopback`]
1339 - [`Ipv6Addr::is_multicast`]
1340 - [`Ipv6Addr::to_ipv4`]
1343 - [`Layout::from_size_align`]
1344 - `pow` for all integer types.
1345 - `checked_pow` for all integer types.
1346 - `saturating_pow` for all integer types.
1347 - `wrapping_pow` for all integer types.
1348 - `next_power_of_two` for all unsigned integer types.
1349 - `checked_next_power_of_two` for all unsigned integer types.
1352 -----------------------
1354 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1355 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1356 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1357 contents of that directory for changes.][cargo/8973]
1358 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1363 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1364 - [Running tests will now print the total time taken to execute.][75752]
1369 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1370 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1371 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1372 unhygenic `macro_rules!` macros.][79472]
1373 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1374 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1375 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1376 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1377 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1378 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1380 [74989]: https://github.com/rust-lang/rust/pull/74989
1381 [79261]: https://github.com/rust-lang/rust/pull/79261
1382 [79896]: https://github.com/rust-lang/rust/pull/79896
1383 [79484]: https://github.com/rust-lang/rust/pull/79484
1384 [79472]: https://github.com/rust-lang/rust/pull/79472
1385 [79270]: https://github.com/rust-lang/rust/pull/79270
1386 [79003]: https://github.com/rust-lang/rust/pull/79003
1387 [78864]: https://github.com/rust-lang/rust/pull/78864
1388 [78636]: https://github.com/rust-lang/rust/pull/78636
1389 [78439]: https://github.com/rust-lang/rust/pull/78439
1390 [78343]: https://github.com/rust-lang/rust/pull/78343
1391 [78296]: https://github.com/rust-lang/rust/pull/78296
1392 [78068]: https://github.com/rust-lang/rust/pull/78068
1393 [75752]: https://github.com/rust-lang/rust/pull/75752
1394 [74699]: https://github.com/rust-lang/rust/pull/74699
1395 [78142]: https://github.com/rust-lang/rust/pull/78142
1396 [77484]: https://github.com/rust-lang/rust/pull/77484
1397 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1398 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1399 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1400 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1401 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1402 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1403 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1404 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1405 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1406 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1407 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1408 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1409 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1410 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1411 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1412 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1413 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1414 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1415 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1416 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1417 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1418 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1419 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1420 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1421 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1422 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1423 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1424 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1425 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1426 [`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
1427 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1428 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1429 [`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
1430 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1433 Version 1.49.0 (2020-12-31)
1434 ============================
1437 -----------------------
1439 - [Unions can now implement `Drop`, and you can now have a field in a union
1440 with `ManuallyDrop<T>`.][77547]
1441 - [You can now cast uninhabited enums to integers.][76199]
1442 - [You can now bind by reference and by move in patterns.][76119] This
1443 allows you to selectively borrow individual components of a type. E.g.
1451 let person = Person {
1452 name: String::from("Alice"),
1456 // `name` is moved out of person, but `age` is referenced.
1457 let Person { name, ref age } = person;
1458 println!("{} {}", name, age);
1462 -----------------------
1464 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1465 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1466 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1467 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1468 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1469 - [Output from threads spawned in tests is now captured.][78227]
1470 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1472 \* Refer to Rust's [platform support page][platform-support-doc] for more
1473 information on Rust's tiered platform support.
1476 -----------------------
1478 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1479 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1484 - [`slice::select_nth_unstable`]
1485 - [`slice::select_nth_unstable_by`]
1486 - [`slice::select_nth_unstable_by_key`]
1488 The following previously stable methods are now `const`.
1490 - [`Poll::is_ready`]
1491 - [`Poll::is_pending`]
1494 -----------------------
1495 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1496 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1497 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1498 variable will be set if the crate being built is one the user selected to build, either
1499 with `-p` or through defaults.
1500 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1506 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1507 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1508 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1509 Previously such invalid or unused attributes could be ignored.
1510 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1511 read [this post about the changes][rustdoc-ws-post] for more details.
1512 - [Trait bounds are no longer inferred for associated types.][79904]
1516 These changes provide no direct user facing benefits, but represent significant
1517 improvements to the internals and overall performance of rustc and
1520 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1521 Local Storage model.][78201]
1522 - [Calculate visibilities once in resolve.][78077]
1523 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1524 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1527 [75991]: https://github.com/rust-lang/rust/pull/75991
1528 [78951]: https://github.com/rust-lang/rust/pull/78951
1529 [78848]: https://github.com/rust-lang/rust/pull/78848
1530 [78746]: https://github.com/rust-lang/rust/pull/78746
1531 [78376]: https://github.com/rust-lang/rust/pull/78376
1532 [78228]: https://github.com/rust-lang/rust/pull/78228
1533 [78227]: https://github.com/rust-lang/rust/pull/78227
1534 [78201]: https://github.com/rust-lang/rust/pull/78201
1535 [78109]: https://github.com/rust-lang/rust/pull/78109
1536 [78077]: https://github.com/rust-lang/rust/pull/78077
1537 [77997]: https://github.com/rust-lang/rust/pull/77997
1538 [77703]: https://github.com/rust-lang/rust/pull/77703
1539 [77547]: https://github.com/rust-lang/rust/pull/77547
1540 [77015]: https://github.com/rust-lang/rust/pull/77015
1541 [76199]: https://github.com/rust-lang/rust/pull/76199
1542 [76119]: https://github.com/rust-lang/rust/pull/76119
1543 [75914]: https://github.com/rust-lang/rust/pull/75914
1544 [79004]: https://github.com/rust-lang/rust/pull/79004
1545 [78676]: https://github.com/rust-lang/rust/pull/78676
1546 [79904]: https://github.com/rust-lang/rust/issues/79904
1547 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1548 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1549 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1550 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1551 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1552 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1553 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1554 [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
1555 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1556 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1557 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1559 Version 1.48.0 (2020-11-19)
1560 ==========================
1565 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1566 is still rejected *semantically*, but can now be parsed by procedural macros.
1570 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1571 `rustc` whether to link its own C runtime and libraries or to rely on a external
1572 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1573 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1574 Note: If you're using cargo you must explicitly pass the `--target` flag.
1575 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1577 \* Refer to Rust's [platform support page][platform-support-doc] for more
1578 information on Rust's tiered platform support.
1582 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1583 and `&Stderr`.][76275]
1584 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1585 - [The `matches!` macro now supports having a trailing comma.][74880]
1586 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1587 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1591 - [`slice::as_ptr_range`]
1592 - [`slice::as_mut_ptr_range`]
1593 - [`VecDeque::make_contiguous`]
1594 - [`future::pending`]
1597 The following previously stable methods are now `const fn`'s:
1599 - [`Option::is_some`]
1600 - [`Option::is_none`]
1601 - [`Option::as_ref`]
1603 - [`Result::is_err`]
1604 - [`Result::as_ref`]
1605 - [`Ordering::reverse`]
1606 - [`Ordering::then`]
1613 - [You can now link to items in `rustdoc` using the intra-doc link
1614 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1615 a link to `std::future`'s documentation. See ["Linking to items by
1616 name"][intradoc-links] for more information.
1617 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1618 when searching through `rustdoc`'s UI.][75740]
1622 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1623 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1624 promoted to `'static` lifetime any more inside `const fn`s.
1625 - [Associated type bindings on trait objects are now verified to meet the bounds
1626 declared on the trait when checking that they implement the trait.][27675]
1627 - [When trait bounds on associated types or opaque types are ambiguous, the
1628 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1629 - [Fixed recursive nonterminals not being expanded in macros during
1630 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1631 correctly handling recursive nonterminal tokens.
1632 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1633 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1634 in places where they have no effect.][73461]
1635 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1636 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1637 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1638 disallow zero-initialization.][71274]
1639 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1640 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1641 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1642 see the [`catch_unwind`] documentation for further information.
1648 These changes provide no direct user facing benefits, but represent significant
1649 improvements to the internals and overall performance of rustc and
1652 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1653 You can continue building with `make` by setting `ninja=false` in
1655 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1656 - [Made `ensure_sufficient_stack()` non-generic][76680]
1658 [78143]: https://github.com/rust-lang/rust/issues/78143
1659 [76680]: https://github.com/rust-lang/rust/pull/76680/
1660 [76030]: https://github.com/rust-lang/rust/pull/76030/
1661 [70212]: https://github.com/rust-lang/rust/pull/70212/
1662 [27675]: https://github.com/rust-lang/rust/issues/27675/
1663 [54121]: https://github.com/rust-lang/rust/issues/54121/
1664 [71274]: https://github.com/rust-lang/rust/pull/71274/
1665 [77386]: https://github.com/rust-lang/rust/pull/77386/
1666 [77153]: https://github.com/rust-lang/rust/pull/77153/
1667 [77055]: https://github.com/rust-lang/rust/pull/77055/
1668 [76275]: https://github.com/rust-lang/rust/pull/76275/
1669 [76310]: https://github.com/rust-lang/rust/pull/76310/
1670 [76420]: https://github.com/rust-lang/rust/pull/76420/
1671 [76158]: https://github.com/rust-lang/rust/pull/76158/
1672 [75857]: https://github.com/rust-lang/rust/pull/75857/
1673 [75585]: https://github.com/rust-lang/rust/pull/75585/
1674 [75740]: https://github.com/rust-lang/rust/pull/75740/
1675 [75502]: https://github.com/rust-lang/rust/pull/75502/
1676 [74880]: https://github.com/rust-lang/rust/pull/74880/
1677 [74922]: https://github.com/rust-lang/rust/pull/74922/
1678 [74430]: https://github.com/rust-lang/rust/pull/74430/
1679 [74194]: https://github.com/rust-lang/rust/pull/74194/
1680 [73461]: https://github.com/rust-lang/rust/pull/73461/
1681 [73166]: https://github.com/rust-lang/rust/pull/73166/
1682 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1683 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1684 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1685 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1686 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1687 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1688 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1689 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1690 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1691 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1692 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1693 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1694 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1695 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1696 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1699 Version 1.47.0 (2020-10-08)
1700 ==========================
1704 - [Closures will now warn when not used.][74869]
1708 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1709 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1711 - [Upgraded to LLVM 11.][73526]
1712 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1713 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1714 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1716 \* Refer to Rust's [platform support page][platform-support-doc] for more
1717 information on Rust's tiered platform support.
1721 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1722 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1723 those of length less than 33.][74060]
1724 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1725 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1726 `PartialEq`, and `PartialOrd`.][73583]
1730 - [`Ident::new_raw`]
1731 - [`Range::is_empty`]
1732 - [`RangeInclusive::is_empty`]
1733 - [`Result::as_deref`]
1734 - [`Result::as_deref_mut`]
1736 - [`pointer::offset_from`]
1740 The following previously stable APIs have now been made const.
1742 - [The `new` method for all `NonZero` integers.][73858]
1743 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1744 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1745 methods for all integers.][73858]
1746 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1747 signed integers.][73858]
1748 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1749 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1750 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1751 `is_ascii_control` methods for `char` and `u8`.][73858]
1755 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1756 You can override this by setting the following in your `Cargo.toml`.
1758 [profile.release.build-override]
1761 - [`cargo-help` will now display man pages for commands rather just the
1762 `--help` text.][cargo/8456]
1763 - [`cargo-metadata` now emits a `test` field indicating if a target has
1764 tests enabled.][cargo/8478]
1765 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1766 - [`cargo-publish` will now use an alternative registry by default if it's the
1767 only registry specified in `package.publish`.][cargo/8571]
1771 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1772 type based search.][75366]
1773 - [Added the Ayu theme to rustdoc.][71237]
1777 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1778 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1779 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1780 help to preserve more span information.][73084] These changes may cause
1781 compiliation errors if your macro was unhygenic or didn't correctly handle
1783 - [Moved support for the CloudABI target to tier 3.][75568]
1784 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1785 - [Added the `rustc-docs` component.][75560] This allows you to install
1786 and read the documentation for the compiler internal APIs. (Currently only
1787 available for `x86_64-unknown-linux-gnu`.)
1792 - [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.
1794 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1795 [75048]: https://github.com/rust-lang/rust/pull/75048/
1796 [74163]: https://github.com/rust-lang/rust/pull/74163/
1797 [71237]: https://github.com/rust-lang/rust/pull/71237/
1798 [74869]: https://github.com/rust-lang/rust/pull/74869/
1799 [73858]: https://github.com/rust-lang/rust/pull/73858/
1800 [75716]: https://github.com/rust-lang/rust/pull/75716/
1801 [75908]: https://github.com/rust-lang/rust/pull/75908/
1802 [75516]: https://github.com/rust-lang/rust/pull/75516/
1803 [75560]: https://github.com/rust-lang/rust/pull/75560/
1804 [75568]: https://github.com/rust-lang/rust/pull/75568/
1805 [75366]: https://github.com/rust-lang/rust/pull/75366/
1806 [75204]: https://github.com/rust-lang/rust/pull/75204/
1807 [74650]: https://github.com/rust-lang/rust/pull/74650/
1808 [74419]: https://github.com/rust-lang/rust/pull/74419/
1809 [73964]: https://github.com/rust-lang/rust/pull/73964/
1810 [74021]: https://github.com/rust-lang/rust/pull/74021/
1811 [74060]: https://github.com/rust-lang/rust/pull/74060/
1812 [73893]: https://github.com/rust-lang/rust/pull/73893/
1813 [73526]: https://github.com/rust-lang/rust/pull/73526/
1814 [73583]: https://github.com/rust-lang/rust/pull/73583/
1815 [73084]: https://github.com/rust-lang/rust/pull/73084/
1816 [73197]: https://github.com/rust-lang/rust/pull/73197/
1817 [72488]: https://github.com/rust-lang/rust/pull/72488/
1818 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1819 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1820 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1821 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1822 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1823 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1824 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1825 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1826 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1827 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1828 [`TypeId::of`]: https://doc.rust-lang.org/nightly/std/any/struct.TypeId.html#method.of
1829 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1830 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1831 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1832 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1835 Version 1.46.0 (2020-08-27)
1836 ==========================
1840 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1841 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1842 const functions.][73862]
1843 - [The `#[track_caller]` attribute can now be added to functions to use the
1844 function's caller's location information for panic messages.][72445]
1845 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1846 `x.0.0` over `(x.0).0`.
1847 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1848 You currently can't use `mem::transmute` in constant functions.
1852 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1853 - [Enabled static "Position Independent Executables" by default
1854 for `x86_64-unknown-linux-musl`.][70740]
1858 - [`mem::forget` is now a `const fn`.][73887]
1859 - [`String` now implements `From<char>`.][73466]
1860 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1861 integer types.][73032]
1862 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1863 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1864 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1865 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1866 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1867 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1872 - [`vec::Drain::as_slice`]
1876 Added a number of new environment variables that are now available when
1877 compiling your crate.
1879 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1880 the specific binary being compiled and the name of the crate.
1881 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1882 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1886 - [The target configuration option `abi_blacklist` has been renamed
1887 to `unsupported_abis`.][74150] The old name will still continue to work.
1888 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1889 This was previously accepted but will become a hard error in a future release.
1890 - [Rustc will fail to compile if you have a struct with
1891 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1893 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1894 ensure that spans have the correct information, and may cause breakage if you
1895 were relying on receiving spans with dummy information.
1896 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1897 a legacy installer that was replaced by a MSI installer a few years ago but
1898 was still being built.
1899 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1900 - [Rustc will no longer accept overlapping trait implementations that only
1901 differ in how the lifetime was bound.][72493]
1902 - [Rustc now correctly relates the lifetime of an existential associated
1903 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1904 you to pass a shorter lifetime than expected.
1905 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1906 The library will need to be installed for `rustc` to work, even though we
1907 expect it to be already available on most systems.
1908 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1910 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1911 exact output returned by rustc's pretty printing is an unstable
1912 implementation detail: we recommend any macro relying on it to switch to a
1913 more robust parsing system.
1915 [75453]: https://github.com/rust-lang/rust/issues/75453/
1916 [74820]: https://github.com/rust-lang/rust/issues/74820/
1917 [74420]: https://github.com/rust-lang/rust/issues/74420/
1918 [74109]: https://github.com/rust-lang/rust/pull/74109/
1919 [74150]: https://github.com/rust-lang/rust/pull/74150/
1920 [73862]: https://github.com/rust-lang/rust/pull/73862/
1921 [73887]: https://github.com/rust-lang/rust/pull/73887/
1922 [73466]: https://github.com/rust-lang/rust/pull/73466/
1923 [73516]: https://github.com/rust-lang/rust/pull/73516/
1924 [73293]: https://github.com/rust-lang/rust/pull/73293/
1925 [73007]: https://github.com/rust-lang/rust/pull/73007/
1926 [73032]: https://github.com/rust-lang/rust/pull/73032/
1927 [72920]: https://github.com/rust-lang/rust/pull/72920/
1928 [72569]: https://github.com/rust-lang/rust/pull/72569/
1929 [72583]: https://github.com/rust-lang/rust/pull/72583/
1930 [72584]: https://github.com/rust-lang/rust/pull/72584/
1931 [72717]: https://github.com/rust-lang/rust/pull/72717/
1932 [72437]: https://github.com/rust-lang/rust/pull/72437/
1933 [72445]: https://github.com/rust-lang/rust/pull/72445/
1934 [72486]: https://github.com/rust-lang/rust/pull/72486/
1935 [72493]: https://github.com/rust-lang/rust/pull/72493/
1936 [72331]: https://github.com/rust-lang/rust/pull/72331/
1937 [71896]: https://github.com/rust-lang/rust/pull/71896/
1938 [71660]: https://github.com/rust-lang/rust/pull/71660/
1939 [71322]: https://github.com/rust-lang/rust/pull/71322/
1940 [70740]: https://github.com/rust-lang/rust/pull/70740/
1941 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1942 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1943 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1944 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1945 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1948 Version 1.45.2 (2020-08-03)
1949 ==========================
1951 * [Fix bindings in tuple struct patterns][74954]
1952 * [Fix track_caller integration with trait objects][74784]
1954 [74954]: https://github.com/rust-lang/rust/issues/74954
1955 [74784]: https://github.com/rust-lang/rust/issues/74784
1958 Version 1.45.1 (2020-07-30)
1959 ==========================
1961 * [Fix const propagation with references.][73613]
1962 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1963 * [Avoid spurious implicit region bound.][74509]
1964 * [Install clippy on x.py install][74457]
1966 [73613]: https://github.com/rust-lang/rust/pull/73613
1967 [73078]: https://github.com/rust-lang/rust/issues/73078
1968 [74509]: https://github.com/rust-lang/rust/pull/74509
1969 [74457]: https://github.com/rust-lang/rust/pull/74457
1972 Version 1.45.0 (2020-07-16)
1973 ==========================
1977 - [Out of range float to int conversions using `as` has been defined as a saturating
1978 conversion.][71269] This was previously undefined behaviour, but you can use the
1979 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1980 may be desirable in rare performance sensitive situations.
1981 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1982 using `u64`.][70705]
1983 - [Function like procedural macros can now be used in expression, pattern, and statement
1984 positions.][68717] This means you can now use a function-like procedural macro
1985 anywhere you can use a declarative (`macro_rules!`) macro.
1989 - [You can now override individual target features through the `target-feature`
1990 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1991 equivalent to `-C target-feature=+avx2,+fma`.
1992 - [Added the `force-unwind-tables` flag.][69984] This option allows
1993 rustc to always generate unwind tables regardless of panic strategy.
1994 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1995 to include LLVM bitcode into generated `rlib`s (this is on by default).
1996 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1997 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1998 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1999 - [Upgraded to LLVM 10.][67759]
2001 \* Refer to Rust's [platform support page][platform-support-doc] for more
2002 information on Rust's tiered platform support.
2007 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2009 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2010 - [You can now use `char` with
2011 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2012 a range of codepoints.][72413] E.g.
2013 you can now write the following;
2015 for ch in 'a'..='z' {
2019 // Prints "abcdefghijklmnopqrstuvwxyz"
2021 - [`OsString` now implements `FromStr`.][71662]
2022 - [The `saturating_neg` method has been added to all signed integer primitive
2023 types, and the `saturating_abs` method has been added for all integer
2024 primitive types.][71886]
2025 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2026 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2028 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2029 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2030 integer types.][69813]
2031 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2032 integer types.][72324]
2033 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2038 - [`BTreeMap::remove_entry`]
2040 - [`rc::Weak::as_ptr`]
2041 - [`rc::Weak::from_raw`]
2042 - [`rc::Weak::into_raw`]
2043 - [`str::strip_prefix`]
2044 - [`str::strip_suffix`]
2045 - [`sync::Weak::as_ptr`]
2046 - [`sync::Weak::from_raw`]
2047 - [`sync::Weak::into_raw`]
2048 - [`char::UNICODE_VERSION`]
2049 - [`Span::resolved_at`]
2050 - [`Span::located_at`]
2051 - [`Span::mixed_site`]
2052 - [`unix::process::CommandExt::arg0`]
2057 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2062 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2063 `~~outdated information~~` becomes "~~outdated information~~".
2064 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2068 - [Trying to self initialize a static value (that is creating a value using
2069 itself) is unsound and now causes a compile error.][71140]
2070 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2071 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2072 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2073 previously undocumented and not intended for public use. Rustdoc still provides
2074 a non-zero exit code on errors.
2075 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2076 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2077 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2078 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2079 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2083 - [Make clippy a git subtree instead of a git submodule][70655]
2084 - [Unify the undo log of all snapshot types][69464]
2086 [71848]: https://github.com/rust-lang/rust/issues/71848/
2087 [73420]: https://github.com/rust-lang/rust/issues/73420/
2088 [72324]: https://github.com/rust-lang/rust/pull/72324/
2089 [71843]: https://github.com/rust-lang/rust/pull/71843/
2090 [71886]: https://github.com/rust-lang/rust/pull/71886/
2091 [72234]: https://github.com/rust-lang/rust/pull/72234/
2092 [72239]: https://github.com/rust-lang/rust/pull/72239/
2093 [72397]: https://github.com/rust-lang/rust/pull/72397/
2094 [72413]: https://github.com/rust-lang/rust/pull/72413/
2095 [72014]: https://github.com/rust-lang/rust/pull/72014/
2096 [72062]: https://github.com/rust-lang/rust/pull/72062/
2097 [72094]: https://github.com/rust-lang/rust/pull/72094/
2098 [72133]: https://github.com/rust-lang/rust/pull/72133/
2099 [67759]: https://github.com/rust-lang/rust/pull/67759/
2100 [71900]: https://github.com/rust-lang/rust/pull/71900/
2101 [71928]: https://github.com/rust-lang/rust/pull/71928/
2102 [71662]: https://github.com/rust-lang/rust/pull/71662/
2103 [71716]: https://github.com/rust-lang/rust/pull/71716/
2104 [71447]: https://github.com/rust-lang/rust/pull/71447/
2105 [71269]: https://github.com/rust-lang/rust/pull/71269/
2106 [71095]: https://github.com/rust-lang/rust/pull/71095/
2107 [71140]: https://github.com/rust-lang/rust/pull/71140/
2108 [70655]: https://github.com/rust-lang/rust/pull/70655/
2109 [70705]: https://github.com/rust-lang/rust/pull/70705/
2110 [69984]: https://github.com/rust-lang/rust/pull/69984/
2111 [69813]: https://github.com/rust-lang/rust/pull/69813/
2112 [69464]: https://github.com/rust-lang/rust/pull/69464/
2113 [68717]: https://github.com/rust-lang/rust/pull/68717/
2114 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2115 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2116 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2117 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2118 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2119 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2120 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2121 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2122 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2123 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2124 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2125 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2126 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2127 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2128 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2129 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2130 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2133 Version 1.44.1 (2020-06-18)
2134 ===========================
2136 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2137 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2138 * [Fix crashes when finding backtrace on macOS.][71397]
2139 * [Clippy applies lint levels into different files.][clippy/5356]
2141 [71397]: https://github.com/rust-lang/rust/issues/71397
2142 [73078]: https://github.com/rust-lang/rust/issues/73078
2143 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2144 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2147 Version 1.44.0 (2020-06-04)
2148 ==========================
2152 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2153 - [Added the `unused_braces` lint.][70081]
2155 **Syntax-only changes**
2157 - [Expansion-driven outline module parsing][69838]
2162 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2167 These are still rejected semantically, so you will likely receive an error but
2168 these changes can be seen and parsed by macros and conditional compilation.
2172 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2173 Additionally when in incremental mode rustc defaults to 256 codegen units.
2174 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2175 a panic is thrown.][67502]
2176 - [Added tier 3\* support for the `aarch64-unknown-none` and
2177 `aarch64-unknown-none-softfloat` targets.][68334]
2178 - [Added tier 3 support for `arm64-apple-tvos` and
2179 `x86_64-apple-tvos` targets.][68191]
2184 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2185 `vec![]` to be able to be used in `const` contexts.
2186 - [`convert::Infallible` now implements `Hash`.][70281]
2187 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2188 a `&mut OsStr`.][70048]
2189 - [Unicode 13 is now supported.][69929]
2190 - [`String` now implements `From<&mut str>`.][69661]
2191 - [`IoSlice` now implements `Copy`.][69403]
2192 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2193 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2194 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2195 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2196 integer types.][69373]
2200 - [`PathBuf::with_capacity`]
2201 - [`PathBuf::capacity`]
2202 - [`PathBuf::clear`]
2203 - [`PathBuf::reserve`]
2204 - [`PathBuf::reserve_exact`]
2205 - [`PathBuf::shrink_to_fit`]
2206 - [`f32::to_int_unchecked`]
2207 - [`f64::to_int_unchecked`]
2208 - [`Layout::align_to`]
2209 - [`Layout::pad_to_align`]
2211 - [`Layout::extend`]
2215 - [Added the `cargo tree` command which will print a tree graph of
2216 your dependencies.][cargo/8062] E.g.
2218 mdbook v0.3.2 (/Users/src/rust/mdbook)
2220 │ ├── html5ever v0.24.0
2222 │ │ │ └── cfg-if v0.1.9
2224 │ │ └── markup5ever v0.9.0
2225 │ │ ├── log v0.4.8 (*)
2227 │ │ │ └── phf_shared v0.7.24
2228 │ │ │ ├── siphasher v0.2.3
2229 │ │ │ └── unicase v1.4.2
2230 │ │ │ [build-dependencies]
2231 │ │ │ └── version_check v0.1.5
2234 You can also display dependencies on multiple versions of the same crate with
2235 `cargo tree -d` (short for `cargo tree --duplicates`).
2239 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2240 the version in the sidebar.][69494]
2244 - [Rustc now correctly generates static libraries on Windows GNU targets with
2245 the `.a` extension, rather than the previous `.lib`.][70937]
2246 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2247 - [The `file_name` property in JSON output of macro errors now points the actual
2248 source file rather than the previous format of `<NAME macros>`.][70969]
2249 **Note:** this may not point to a file that actually exists on the user's system.
2250 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2251 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2252 not allow zero initialization such as `NonZeroU8`.][66059] This was
2253 previously a warning.
2254 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2255 operator has been defined as a saturating operation.][71269] This was previously
2256 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2257 continue using the current behaviour, which may be desirable in rare performance
2258 sensitive situations.
2262 These changes provide no direct user facing benefits, but represent significant
2263 improvements to the internals and overall performance of rustc and
2266 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2267 - [Replace big JS dict with JSON parsing.][71250]
2269 [69373]: https://github.com/rust-lang/rust/pull/69373/
2270 [66059]: https://github.com/rust-lang/rust/pull/66059/
2271 [68191]: https://github.com/rust-lang/rust/pull/68191/
2272 [68899]: https://github.com/rust-lang/rust/pull/68899/
2273 [71147]: https://github.com/rust-lang/rust/pull/71147/
2274 [71250]: https://github.com/rust-lang/rust/pull/71250/
2275 [70937]: https://github.com/rust-lang/rust/pull/70937/
2276 [70969]: https://github.com/rust-lang/rust/pull/70969/
2277 [70632]: https://github.com/rust-lang/rust/pull/70632/
2278 [70281]: https://github.com/rust-lang/rust/pull/70281/
2279 [70345]: https://github.com/rust-lang/rust/pull/70345/
2280 [70048]: https://github.com/rust-lang/rust/pull/70048/
2281 [70081]: https://github.com/rust-lang/rust/pull/70081/
2282 [70156]: https://github.com/rust-lang/rust/pull/70156/
2283 [71269]: https://github.com/rust-lang/rust/pull/71269/
2284 [69838]: https://github.com/rust-lang/rust/pull/69838/
2285 [69929]: https://github.com/rust-lang/rust/pull/69929/
2286 [69661]: https://github.com/rust-lang/rust/pull/69661/
2287 [69778]: https://github.com/rust-lang/rust/pull/69778/
2288 [69494]: https://github.com/rust-lang/rust/pull/69494/
2289 [69403]: https://github.com/rust-lang/rust/pull/69403/
2290 [69033]: https://github.com/rust-lang/rust/pull/69033/
2291 [68692]: https://github.com/rust-lang/rust/pull/68692/
2292 [68334]: https://github.com/rust-lang/rust/pull/68334/
2293 [67502]: https://github.com/rust-lang/rust/pull/67502/
2294 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2295 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2296 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2297 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2298 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2299 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2300 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2301 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2302 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2303 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2304 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2305 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2306 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2309 Version 1.43.1 (2020-05-07)
2310 ===========================
2312 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2313 * [Fixed the stabilization of AVX-512 features.][71473]
2314 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2316 [71430]: https://github.com/rust-lang/rust/pull/71430
2317 [71473]: https://github.com/rust-lang/rust/issues/71473
2318 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2321 Version 1.43.0 (2020-04-23)
2322 ==========================
2326 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2327 the type inferred correctly.][68129]
2328 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2330 **Syntax only changes**
2331 - [Allow `type Foo: Ord` syntactically.][69361]
2332 - [Fuse associated and extern items up to defaultness.][69194]
2333 - [Syntactically allow `self` in all `fn` contexts.][68764]
2334 - [Merge `fn` syntax + cleanup item parsing.][68728]
2335 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2336 For example, you may now write:
2338 macro_rules! mac_trait {
2348 These are still rejected *semantically*, so you will likely receive an error but
2349 these changes can be seen and parsed by macros and
2350 conditional compilation.
2355 - [You can now pass multiple lint flags to rustc to override the previous
2356 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2357 everything in the `unused` lint group except `unused-variables` which
2358 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2359 everything in the `unused` lint group **including** `unused-variables` since
2360 the allow flag is specified before the deny flag (and therefore overridden).
2361 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2362 if they are available on `windows-gnu`.][67429]
2363 - [rustc now buffers errors/warnings printed in JSON.][69227]
2367 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2368 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2369 respectively.][69538] **Note** These conversions are only available when `N`
2371 - [You can now use associated constants on floats and integers directly, rather
2372 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2373 `f32::NAN` with no imports.
2374 - [`u8::is_ascii` is now `const`.][68984]
2375 - [`String` now implements `AsMut<str>`.][68742]
2376 - [Added the `primitive` module to `std` and `core`.][67637] This module
2377 reexports Rust's primitive types. This is mainly useful in macros
2378 where you want avoid these types being shadowed.
2379 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2380 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2384 - [`Once::is_completed`]
2389 - [`iter::once_with`]
2393 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2394 your environment.][cargo/7823]
2395 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2396 executable path when running integration tests or benchmarks.][cargo/7697]
2397 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2398 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2402 - [Certain checks in the `const_err` lint were deemed unrelated to const
2403 evaluation][69185], and have been moved to the `unconditional_panic` and
2404 `arithmetic_overflow` lints.
2409 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2410 has been a warning since 1.36.0.
2411 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2412 led to some instances being accepted, and now correctly emits a hard error.
2414 [69340]: https://github.com/rust-lang/rust/pull/69340
2418 These changes provide no direct user facing benefits, but represent significant
2419 improvements to the internals and overall performance of `rustc` and
2422 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2423 - [Improved how rustc generates drop code.][67332]
2424 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2425 - [traits: preallocate 2 Vecs of known initial size][69022]
2426 - [Avoid exponential behaviour when relating types][68772]
2427 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2428 - [Improve performance of coherence checks][68966]
2429 - [Deduplicate types in the generator witness][68672]
2430 - [Invert control in struct_lint_level.][68725]
2432 [67332]: https://github.com/rust-lang/rust/pull/67332/
2433 [67429]: https://github.com/rust-lang/rust/pull/67429/
2434 [67637]: https://github.com/rust-lang/rust/pull/67637/
2435 [67642]: https://github.com/rust-lang/rust/pull/67642/
2436 [67878]: https://github.com/rust-lang/rust/pull/67878/
2437 [67885]: https://github.com/rust-lang/rust/pull/67885/
2438 [68129]: https://github.com/rust-lang/rust/pull/68129/
2439 [68672]: https://github.com/rust-lang/rust/pull/68672/
2440 [68725]: https://github.com/rust-lang/rust/pull/68725/
2441 [68728]: https://github.com/rust-lang/rust/pull/68728/
2442 [68738]: https://github.com/rust-lang/rust/pull/68738/
2443 [68742]: https://github.com/rust-lang/rust/pull/68742/
2444 [68764]: https://github.com/rust-lang/rust/pull/68764/
2445 [68772]: https://github.com/rust-lang/rust/pull/68772/
2446 [68943]: https://github.com/rust-lang/rust/pull/68943/
2447 [68952]: https://github.com/rust-lang/rust/pull/68952/
2448 [68966]: https://github.com/rust-lang/rust/pull/68966/
2449 [68984]: https://github.com/rust-lang/rust/pull/68984/
2450 [69022]: https://github.com/rust-lang/rust/pull/69022/
2451 [69185]: https://github.com/rust-lang/rust/pull/69185/
2452 [69194]: https://github.com/rust-lang/rust/pull/69194/
2453 [69201]: https://github.com/rust-lang/rust/pull/69201/
2454 [69227]: https://github.com/rust-lang/rust/pull/69227/
2455 [69548]: https://github.com/rust-lang/rust/pull/69548/
2456 [69256]: https://github.com/rust-lang/rust/pull/69256/
2457 [69361]: https://github.com/rust-lang/rust/pull/69361/
2458 [69366]: https://github.com/rust-lang/rust/pull/69366/
2459 [69538]: https://github.com/rust-lang/rust/pull/69538/
2460 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2461 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2462 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2463 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2464 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2465 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2466 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2467 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2470 Version 1.42.0 (2020-03-12)
2471 ==========================
2475 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2477 fn foo(words: &[&str]) {
2479 ["Hello", "World", "!", ..] => println!("Hello World!"),
2480 ["Foo", "Bar", ..] => println!("Baz"),
2481 rest => println!("{:?}", rest),
2485 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2486 that you can create an enum that has the exact layout and ABI of the type
2488 - [You can now use outer attribute procedural macros on inline modules.][64273]
2489 - [There are some *syntax-only* changes:][67131]
2490 - `default` is syntactically allowed before items in `trait` definitions.
2491 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2492 leave out their bodies in favor of `;`.
2493 - Bounds on associated types in `impl`s are now syntactically allowed
2494 (e.g. `type Foo: Ord;`).
2495 - `...` (the C-variadic type) may occur syntactically directly as the type of
2496 any function parameter.
2498 These are still rejected *semantically*, so you will likely receive an error
2499 but these changes can be seen and parsed by procedural macros and
2500 conditional compilation.
2504 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2505 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2506 - [`Option::{expect,unwrap}` and
2507 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2508 pointing to the location where they were called, rather than
2509 `core`'s internals. ][67887]
2511 \* Refer to Rust's [platform support page][platform-support-doc] for more
2512 information on Rust's tiered platform support.
2516 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2517 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2518 to implement `Sized`.][67935]
2519 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2520 - [`Layout::new` is now `const`.][66254]
2521 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2526 - [`CondVar::wait_while`]
2527 - [`CondVar::wait_timeout_while`]
2529 - [`DebugMap::value`]
2530 - [`ManuallyDrop::take`]
2532 - [`ptr::slice_from_raw_parts_mut`]
2533 - [`ptr::slice_from_raw_parts`]
2537 - [You no longer need to include `extern crate proc_macro;` to be able to
2538 `use proc_macro;` in the `2018` edition.][cargo/7700]
2542 - [`Error::description` has been deprecated, and its use will now produce a
2543 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2545 [68253]: https://github.com/rust-lang/rust/pull/68253/
2546 [68348]: https://github.com/rust-lang/rust/pull/68348/
2547 [67935]: https://github.com/rust-lang/rust/pull/67935/
2548 [68339]: https://github.com/rust-lang/rust/pull/68339/
2549 [68122]: https://github.com/rust-lang/rust/pull/68122/
2550 [64273]: https://github.com/rust-lang/rust/pull/64273/
2551 [67712]: https://github.com/rust-lang/rust/pull/67712/
2552 [67887]: https://github.com/rust-lang/rust/pull/67887/
2553 [67131]: https://github.com/rust-lang/rust/pull/67131/
2554 [67233]: https://github.com/rust-lang/rust/pull/67233/
2555 [66899]: https://github.com/rust-lang/rust/pull/66899/
2556 [66919]: https://github.com/rust-lang/rust/pull/66919/
2557 [66254]: https://github.com/rust-lang/rust/pull/66254/
2558 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2559 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2560 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2561 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2562 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2563 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2564 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2565 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2566 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2569 Version 1.41.1 (2020-02-27)
2570 ===========================
2572 * [Always check types of static items][69145]
2573 * [Always check lifetime bounds of `Copy` impls][69145]
2574 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2576 [69225]: https://github.com/rust-lang/rust/issues/69225
2577 [69145]: https://github.com/rust-lang/rust/pull/69145
2580 Version 1.41.0 (2020-01-30)
2581 ===========================
2586 - [You can now pass type parameters to foreign items when implementing
2587 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2588 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2589 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2590 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2591 - [You can now use any valid identifier in a `format_args` macro.][66847]
2592 Previously identifiers starting with an underscore were not allowed.
2593 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2594 enum variants.][66183] These are still rejected semantically, but
2595 can be seen and parsed by procedural macros and conditional compilation.
2600 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2601 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2602 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2603 - [You can now pass an arguments file passing the `@path` syntax
2604 to rustc.][66172] Note that the format differs somewhat from what is
2605 found in other tooling; please see [the documentation][argfile-docs] for
2607 - [You can now provide `--extern` flag without a path, indicating that it is
2608 available from the search path or specified with an `-L` flag.][64882]
2610 \* Refer to Rust's [platform support page][platform-support-doc] for more
2611 information on Rust's tiered platform support.
2613 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2618 - [The `core::panic` module is now stable.][66771] It was already stable
2620 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2621 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2622 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2627 - [`Result::map_or`]
2628 - [`Result::map_or_else`]
2629 - [`std::rc::Weak::weak_count`]
2630 - [`std::rc::Weak::strong_count`]
2631 - [`std::sync::Weak::weak_count`]
2632 - [`std::sync::Weak::strong_count`]
2637 - [Cargo will now document all the private items for binary crates
2638 by default.][cargo/7593]
2639 - [`cargo-install` will now reinstall the package if it detects that it is out
2640 of date.][cargo/7560]
2641 - [Cargo.lock now uses a more git friendly format that should help to reduce
2642 merge conflicts.][cargo/7579]
2643 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2644 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2645 optimisation level to `2` for debug builds. You can also use
2646 `[profile.<profile>.build-override]` to override build scripts and
2652 - [You can now specify `edition` in documentation code blocks to compile the block
2653 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2654 should be compiled the 2018 edition of Rust.
2655 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2656 current theme with `--check-theme`.][54733]
2657 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2662 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2663 Apple targets.][apple-32bit-drop] This means that the source code is still
2664 available to build, but the targets are no longer being tested and release
2665 binaries for those platforms will no longer be distributed by the Rust project.
2666 Please refer to the linked blog post for more information.
2668 [54733]: https://github.com/rust-lang/rust/pull/54733/
2669 [61351]: https://github.com/rust-lang/rust/pull/61351/
2670 [67255]: https://github.com/rust-lang/rust/pull/67255/
2671 [66661]: https://github.com/rust-lang/rust/pull/66661/
2672 [66771]: https://github.com/rust-lang/rust/pull/66771/
2673 [66847]: https://github.com/rust-lang/rust/pull/66847/
2674 [66238]: https://github.com/rust-lang/rust/pull/66238/
2675 [66277]: https://github.com/rust-lang/rust/pull/66277/
2676 [66325]: https://github.com/rust-lang/rust/pull/66325/
2677 [66172]: https://github.com/rust-lang/rust/pull/66172/
2678 [66183]: https://github.com/rust-lang/rust/pull/66183/
2679 [65879]: https://github.com/rust-lang/rust/pull/65879/
2680 [65013]: https://github.com/rust-lang/rust/pull/65013/
2681 [64882]: https://github.com/rust-lang/rust/pull/64882/
2682 [64325]: https://github.com/rust-lang/rust/pull/64325/
2683 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2684 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2685 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2686 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2687 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2688 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2689 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2690 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2691 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2692 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2693 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2695 Version 1.40.0 (2019-12-19)
2696 ===========================
2700 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2701 `const` contexts.][65188] e.g.
2704 pub struct Point(i32, i32);
2706 const ORIGIN: Point = {
2707 let constructor = Point;
2713 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2714 indicate that there may be variants or fields added in the future.][64639]
2715 For example this requires adding a wild-card branch (`_ => {}`) to any match
2716 statements on a non-exhaustive `enum`. [(RFC 2008)]
2717 - [You can now use function-like procedural macros in `extern` blocks and in
2718 type positions.][63931] e.g. `type Generated = macro!();`
2719 - [Function-like and attribute procedural macros can now emit
2720 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2721 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2722 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2723 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2727 - [Added tier 3 support\* for the
2728 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2729 - [Added tier 3 support for the
2730 `aarch64-unknown-none-softfloat` target.][64589]
2731 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2732 `mips64el-unknown-linux-muslabi64` targets.][65843]
2734 \* Refer to Rust's [platform support page][platform-support-doc] for more
2735 information on Rust's tiered platform support.
2739 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2743 - [`BTreeMap::get_key_value`]
2744 - [`HashMap::get_key_value`]
2745 - [`Option::as_deref_mut`]
2746 - [`Option::as_deref`]
2747 - [`Option::flatten`]
2748 - [`UdpSocket::peer_addr`]
2749 - [`f32::to_be_bytes`]
2750 - [`f32::to_le_bytes`]
2751 - [`f32::to_ne_bytes`]
2752 - [`f64::to_be_bytes`]
2753 - [`f64::to_le_bytes`]
2754 - [`f64::to_ne_bytes`]
2755 - [`f32::from_be_bytes`]
2756 - [`f32::from_le_bytes`]
2757 - [`f32::from_ne_bytes`]
2758 - [`f64::from_be_bytes`]
2759 - [`f64::from_le_bytes`]
2760 - [`f64::from_ne_bytes`]
2767 - [Cargo will now always display warnings, rather than only on
2768 fresh builds.][cargo/7450]
2769 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2770 now produce an error.][cargo/7507] Previously these flags were ignored.
2771 - [You can now publish `dev-dependencies` without including
2772 a `version`.][cargo/7333]
2776 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2777 when running documentation tests with `rustdoc`.][63803]
2781 - [As previously announced, any previous NLL warnings in the 2015 edition are
2782 now hard errors.][64221]
2783 - [The `include!` macro will now warn if it failed to include the
2784 entire file.][64284] The `include!` macro unintentionally only includes the
2785 first _expression_ in a file, and this can be unintuitive. This will become
2786 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2787 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2788 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2789 or `extern` blocks now correctly emits a hard error.
2791 [65294]: https://github.com/rust-lang/rust/pull/65294/
2792 [66103]: https://github.com/rust-lang/rust/pull/66103/
2793 [65843]: https://github.com/rust-lang/rust/pull/65843/
2794 [65188]: https://github.com/rust-lang/rust/pull/65188/
2795 [65092]: https://github.com/rust-lang/rust/pull/65092/
2796 [64589]: https://github.com/rust-lang/rust/pull/64589/
2797 [64639]: https://github.com/rust-lang/rust/pull/64639/
2798 [64221]: https://github.com/rust-lang/rust/pull/64221/
2799 [64284]: https://github.com/rust-lang/rust/pull/64284/
2800 [63931]: https://github.com/rust-lang/rust/pull/63931/
2801 [64035]: https://github.com/rust-lang/rust/pull/64035/
2802 [63674]: https://github.com/rust-lang/rust/pull/63674/
2803 [63803]: https://github.com/rust-lang/rust/pull/63803/
2804 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2805 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2806 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
2807 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2808 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2809 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2810 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2811 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2812 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2813 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2814 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2815 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2816 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2817 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2818 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2819 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2820 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2821 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2822 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2823 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2824 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2825 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2826 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2827 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2828 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2829 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2832 Version 1.39.0 (2019-11-07)
2833 ===========================
2837 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2838 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2839 - [You can now use certain attributes on function, closure, and function pointer
2840 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2841 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2842 attributes applied to items. e.g.
2845 #[cfg(windows)] slice: &[u16],
2846 #[cfg(not(windows))] slice: &[u8],
2851 - [You can now take shared references to bind-by-move patterns in the `if` guards
2852 of `match` arms.][63118] e.g.
2855 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2859 // ---- `nums` is bound by move.
2860 if nums.iter().sum::<u8>() == 10
2861 // ^------ `.iter()` implicitly takes a reference to `nums`.
2864 // ----------- Legal as `nums` was bound by move and so we have ownership.
2866 _ => unreachable!(),
2875 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2876 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2877 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2878 **Note** Cargo currently doesn't use this feature. Refer to
2879 [cargo#7315][cargo/7315] to track this feature's progress.
2880 - [You can now pass `--show-output` argument to test binaries to print the
2881 output of successful tests.][62600]
2884 \* Refer to Rust's [platform support page][platform-support-doc] for more
2885 information on Rust's tiered platform support.
2889 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2890 - [`LinkedList::new` is now a `const` function.][63684]
2891 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2892 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2893 now `const`.][63786]
2897 - [`Pin::into_inner`]
2898 - [`Instant::checked_duration_since`]
2899 - [`Instant::saturating_duration_since`]
2903 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2904 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2905 `--all` is now deprecated.
2909 - [You can now pass `-Clinker` to rustdoc to control the linker used
2910 for compiling doctests.][63834]
2914 - [Code that was previously accepted by the old borrow checker, but rejected by
2915 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2916 previously a warning, and will also become a hard error in the Rust 2015
2917 edition in the 1.40.0 release.
2918 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2919 run tests.][63827] This should improve performance when running a large
2921 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2922 recommended to use the `?` operator instead.
2923 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2926 [62600]: https://github.com/rust-lang/rust/pull/62600/
2927 [62672]: https://github.com/rust-lang/rust/pull/62672/
2928 [63118]: https://github.com/rust-lang/rust/pull/63118/
2929 [63209]: https://github.com/rust-lang/rust/pull/63209/
2930 [63402]: https://github.com/rust-lang/rust/pull/63402/
2931 [63565]: https://github.com/rust-lang/rust/pull/63565/
2932 [63595]: https://github.com/rust-lang/rust/pull/63595/
2933 [63684]: https://github.com/rust-lang/rust/pull/63684/
2934 [63698]: https://github.com/rust-lang/rust/pull/63698/
2935 [63770]: https://github.com/rust-lang/rust/pull/63770/
2936 [63786]: https://github.com/rust-lang/rust/pull/63786/
2937 [63827]: https://github.com/rust-lang/rust/pull/63827/
2938 [63834]: https://github.com/rust-lang/rust/pull/63834/
2939 [63927]: https://github.com/rust-lang/rust/pull/63927/
2940 [63933]: https://github.com/rust-lang/rust/pull/63933/
2941 [63934]: https://github.com/rust-lang/rust/pull/63934/
2942 [63938]: https://github.com/rust-lang/rust/pull/63938/
2943 [63940]: https://github.com/rust-lang/rust/pull/63940/
2944 [63941]: https://github.com/rust-lang/rust/pull/63941/
2945 [63945]: https://github.com/rust-lang/rust/pull/63945/
2946 [64010]: https://github.com/rust-lang/rust/pull/64010/
2947 [64028]: https://github.com/rust-lang/rust/pull/64028/
2948 [64334]: https://github.com/rust-lang/rust/pull/64334/
2949 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2950 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2951 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2952 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2953 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2954 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2956 Version 1.38.0 (2019-09-26)
2957 ==========================
2961 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2962 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2966 - [Added pipelined compilation support to `rustc`.][62766] This will
2967 improve compilation times in some cases. For further information please refer
2968 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2969 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2970 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2971 `x86_64-uwp-windows-msvc` targets.][60260]
2972 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2973 `armv7-unknown-linux-musleabi` targets.][63107]
2974 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2975 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2976 - [Upgraded to LLVM 9.][62592]
2978 \* Refer to Rust's [platform support page][platform-support-doc] for more
2979 information on Rust's tiered platform support.
2983 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2984 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2985 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2986 is available at `std::clone::Clone`). This also makes all built-in macros
2987 available in `std`/`core` root. e.g. `std::include_bytes!`.
2988 - [`str::Chars` now implements `Debug`.][63000]
2989 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2990 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2991 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2992 - [Added euclidean remainder and division operations (`div_euclid`,
2993 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2994 `overflowing`, and `wrapping` versions are available for all
2996 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2997 `PartialEq`.][61491]
2998 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3002 - [`<*const T>::cast`]
3003 - [`<*mut T>::cast`]
3004 - [`Duration::as_secs_f32`]
3005 - [`Duration::as_secs_f64`]
3006 - [`Duration::div_f32`]
3007 - [`Duration::div_f64`]
3008 - [`Duration::from_secs_f32`]
3009 - [`Duration::from_secs_f64`]
3010 - [`Duration::mul_f32`]
3011 - [`Duration::mul_f64`]
3012 - [`any::type_name`]
3016 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3017 - [You can now pass the `--features` option multiple times to enable
3018 multiple features.][cargo/7084]
3023 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3027 - [`rustc` will now warn about some incorrect uses of
3028 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3032 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3034 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3035 issues][62896] with certain crates such as libc.
3037 [60260]: https://github.com/rust-lang/rust/pull/60260/
3038 [61457]: https://github.com/rust-lang/rust/pull/61457/
3039 [61491]: https://github.com/rust-lang/rust/pull/61491/
3040 [61884]: https://github.com/rust-lang/rust/pull/61884/
3041 [61953]: https://github.com/rust-lang/rust/pull/61953/
3042 [62042]: https://github.com/rust-lang/rust/pull/62042/
3043 [62528]: https://github.com/rust-lang/rust/pull/62528/
3044 [62583]: https://github.com/rust-lang/rust/pull/62583/
3045 [62735]: https://github.com/rust-lang/rust/pull/62735/
3046 [62766]: https://github.com/rust-lang/rust/pull/62766/
3047 [62784]: https://github.com/rust-lang/rust/pull/62784/
3048 [62592]: https://github.com/rust-lang/rust/pull/62592/
3049 [62785]: https://github.com/rust-lang/rust/issues/62785/
3050 [62814]: https://github.com/rust-lang/rust/pull/62814/
3051 [62896]: https://github.com/rust-lang/rust/issues/62896/
3052 [63000]: https://github.com/rust-lang/rust/pull/63000/
3053 [63056]: https://github.com/rust-lang/rust/pull/63056/
3054 [63107]: https://github.com/rust-lang/rust/pull/63107/
3055 [63346]: https://github.com/rust-lang/rust/pull/63346/
3056 [63421]: https://github.com/rust-lang/rust/pull/63421/
3057 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3058 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3059 [63048]: https://github.com/rust-lang/rust/pull/63048
3060 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3061 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3062 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3063 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3064 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3065 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3066 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3067 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3068 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3069 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3070 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3071 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3072 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3074 Version 1.37.0 (2019-08-15)
3075 ==========================
3079 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3080 [`Box`][62228], or an [array][62235] and unused.
3081 - [You can now use the `cfg` and `cfg_attr` attributes on
3082 generic parameters.][61547]
3083 - [You can now use enum variants through type alias.][61682] e.g. You can
3084 write the following:
3086 type MyOption = Option<u8>;
3088 fn increment_or_zero(x: MyOption) -> u8 {
3090 MyOption::Some(y) => y + 1,
3091 MyOption::None => 0,
3095 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3096 `const _: u32 = 5;`.
3097 - [You can now use `#[repr(align(X)]` on enums.][61229]
3098 - [The `?` Kleene macro operator is now available in the
3099 2015 edition.][60932]
3103 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3104 and `-C profile-use` flags.][61268] For more information on how to use profile
3105 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3106 - [The `rust-lldb` wrapper script should now work again.][61827]
3110 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3114 - [`BufReader::buffer`]
3115 - [`BufWriter::buffer`]
3116 - [`Cell::from_mut`]
3117 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3118 - [`DoubleEndedIterator::nth_back`]
3120 - [`Wrapping::reverse_bits`]
3121 - [`i128::reverse_bits`]
3122 - [`i16::reverse_bits`]
3123 - [`i32::reverse_bits`]
3124 - [`i64::reverse_bits`]
3125 - [`i8::reverse_bits`]
3126 - [`isize::reverse_bits`]
3127 - [`slice::copy_within`]
3128 - [`u128::reverse_bits`]
3129 - [`u16::reverse_bits`]
3130 - [`u32::reverse_bits`]
3131 - [`u64::reverse_bits`]
3132 - [`u8::reverse_bits`]
3133 - [`usize::reverse_bits`]
3137 - [`Cargo.lock` files are now included by default when publishing executable crates
3138 with executables.][cargo/7026]
3139 - [You can now specify `default-run="foo"` in `[package]` to specify the
3140 default executable to use for `cargo run`.][cargo/7056]
3147 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3148 Please transition your code to using the `..=` syntax for inclusive
3150 - [Using a trait object without the `dyn` will now warn by default.][61203]
3151 Please transition your code to use `dyn Trait` for trait objects instead.
3153 [62228]: https://github.com/rust-lang/rust/pull/62228/
3154 [62235]: https://github.com/rust-lang/rust/pull/62235/
3155 [61802]: https://github.com/rust-lang/rust/pull/61802/
3156 [61827]: https://github.com/rust-lang/rust/pull/61827/
3157 [61547]: https://github.com/rust-lang/rust/pull/61547/
3158 [61682]: https://github.com/rust-lang/rust/pull/61682/
3159 [61268]: https://github.com/rust-lang/rust/pull/61268/
3160 [61342]: https://github.com/rust-lang/rust/pull/61342/
3161 [61347]: https://github.com/rust-lang/rust/pull/61347/
3162 [61100]: https://github.com/rust-lang/rust/pull/61100/
3163 [61203]: https://github.com/rust-lang/rust/pull/61203/
3164 [61229]: https://github.com/rust-lang/rust/pull/61229/
3165 [60932]: https://github.com/rust-lang/rust/pull/60932/
3166 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3167 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3168 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3169 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3170 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3171 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3172 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3173 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3174 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
3175 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3176 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3177 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3178 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3179 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3180 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3181 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3182 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3183 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3184 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3185 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3186 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3187 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3188 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3189 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3192 Version 1.36.0 (2019-07-04)
3193 ==========================
3197 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3198 - [The order of traits in trait objects no longer affects the semantics of that
3199 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3200 `dyn fmt::Debug + Send`, where this was previously not the case.
3204 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3205 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3206 - [`mem::needs_drop` is now available as a const fn.][60364]
3207 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3208 - [`String` now implements `BorrowMut<str>`.][60404]
3209 - [`io::Cursor` now implements `Default`.][60234]
3210 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3211 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3212 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3213 environment has access to heap memory allocation.
3214 - [`String` now implements `From<&String>`.][59825]
3215 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3216 return a tuple of each argument when there is multiple arguments.
3217 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3222 - [`VecDeque::rotate_left`]
3223 - [`VecDeque::rotate_right`]
3224 - [`Iterator::copied`]
3226 - [`io::IoSliceMut`]
3227 - [`Read::read_vectored`]
3228 - [`Write::write_vectored`]
3229 - [`str::as_mut_ptr`]
3230 - [`mem::MaybeUninit`]
3231 - [`pointer::align_offset`]
3232 - [`future::Future`]
3234 - [`task::RawWaker`]
3235 - [`task::RawWakerVTable`]
3241 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3242 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3244 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3248 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3255 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3256 longer recommended, and will be deprecated in 1.39.0.
3258 [60318]: https://github.com/rust-lang/rust/pull/60318/
3259 [60364]: https://github.com/rust-lang/rust/pull/60364/
3260 [60370]: https://github.com/rust-lang/rust/pull/60370/
3261 [60404]: https://github.com/rust-lang/rust/pull/60404/
3262 [60234]: https://github.com/rust-lang/rust/pull/60234/
3263 [60244]: https://github.com/rust-lang/rust/pull/60244/
3264 [58623]: https://github.com/rust-lang/rust/pull/58623/
3265 [59648]: https://github.com/rust-lang/rust/pull/59648/
3266 [59675]: https://github.com/rust-lang/rust/pull/59675/
3267 [59825]: https://github.com/rust-lang/rust/pull/59825/
3268 [59826]: https://github.com/rust-lang/rust/pull/59826/
3269 [59445]: https://github.com/rust-lang/rust/pull/59445/
3270 [59114]: https://github.com/rust-lang/rust/pull/59114/
3271 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3272 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3273 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3274 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3275 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3276 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3277 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3278 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3279 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3280 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3281 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3282 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3283 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3284 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3285 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3286 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3287 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3288 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3289 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3290 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3293 Version 1.35.0 (2019-05-23)
3294 ==========================
3298 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3299 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3300 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3302 unsafe fn call_unsafe(func: unsafe fn()) {
3307 unsafe { call_unsafe(|| {}); }
3314 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3315 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3316 - [Added the `wasm32-unknown-wasi` target.][59464]
3321 - [`Thread` will now show its ID in `Debug` output.][59460]
3322 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3323 - [`alloc::System` now implements `Default`.][59451]
3324 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3326 - [`char::{ToLowercase, ToUppercase}` now
3327 implement `ExactSizeIterator`.][58778]
3328 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3329 - [Removed the `Read` trait bounds
3330 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3331 - [You can now call the `dbg!` macro without any parameters to print the file
3332 and line where it is called.][57847]
3333 - [In place ASCII case conversions are now up to 4× faster.][59283]
3334 e.g. `str::make_ascii_lowercase`
3335 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3342 - [`RefCell::replace_with`]
3343 - [`RefCell::map_split`]
3345 - [`Range::contains`]
3346 - [`RangeFrom::contains`]
3347 - [`RangeTo::contains`]
3348 - [`RangeInclusive::contains`]
3349 - [`RangeToInclusive::contains`]
3350 - [`Option::copied`]
3354 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3355 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3360 - [The Rust toolchain is now available natively for musl based distros.][58575]
3362 [59460]: https://github.com/rust-lang/rust/pull/59460/
3363 [59464]: https://github.com/rust-lang/rust/pull/59464/
3364 [59500]: https://github.com/rust-lang/rust/pull/59500/
3365 [59512]: https://github.com/rust-lang/rust/pull/59512/
3366 [59580]: https://github.com/rust-lang/rust/pull/59580/
3367 [59283]: https://github.com/rust-lang/rust/pull/59283/
3368 [59451]: https://github.com/rust-lang/rust/pull/59451/
3369 [59076]: https://github.com/rust-lang/rust/pull/59076/
3370 [58778]: https://github.com/rust-lang/rust/pull/58778/
3371 [58717]: https://github.com/rust-lang/rust/pull/58717/
3372 [58369]: https://github.com/rust-lang/rust/pull/58369/
3373 [58423]: https://github.com/rust-lang/rust/pull/58423/
3374 [58080]: https://github.com/rust-lang/rust/pull/58080/
3375 [57847]: https://github.com/rust-lang/rust/pull/57847/
3376 [58575]: https://github.com/rust-lang/rust/pull/58575
3377 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3378 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3379 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3380 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3381 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3382 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3383 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3384 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3385 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3386 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3387 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3388 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3390 Version 1.34.2 (2019-05-14)
3391 ===========================
3393 * [Destabilize the `Error::type_id` function due to a security
3394 vulnerability][60785] ([CVE-2019-12083])
3396 [60785]: https://github.com/rust-lang/rust/pull/60785
3397 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3399 Version 1.34.1 (2019-04-25)
3400 ===========================
3402 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3403 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3404 * [Fix Clippy panic when checking some macros][clippy/3805]
3406 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3407 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3408 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3410 Version 1.34.0 (2019-04-11)
3411 ==========================
3415 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3416 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3418 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3419 `#[attr{}]` procedural macros.][57367]
3420 - [You can now write `extern crate self as foo;`][57407] to import your
3421 crate's root into the extern prelude.
3426 - [You can now target `riscv64imac-unknown-none-elf` and
3427 `riscv64gc-unknown-none-elf`.][58406]
3428 - [You can now enable linker plugin LTO optimisations with
3429 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3430 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3432 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3437 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3438 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3439 the `Hash` trait to create an iterator.
3440 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3441 methods.][58421] Most notably you no longer require the `Ord` trait to create
3443 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3444 for all numeric types.][58044]
3445 - [Indexing a `str` is now generic over all types that
3446 implement `SliceIndex<str>`.][57604]
3447 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3448 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3449 produce a warning if their returning type is unused.
3450 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3451 `overflowing_pow` are now available for all numeric types.][57873] These are
3452 equivalent to methods such as `wrapping_add` for the `pow` operation.
3460 * [`Error::type_id`]
3461 * [`atomic::AtomicI16`]
3462 * [`atomic::AtomicI32`]
3463 * [`atomic::AtomicI64`]
3464 * [`atomic::AtomicI8`]
3465 * [`atomic::AtomicU16`]
3466 * [`atomic::AtomicU32`]
3467 * [`atomic::AtomicU64`]
3468 * [`atomic::AtomicU8`]
3469 * [`convert::Infallible`]
3470 * [`convert::TryFrom`]
3471 * [`convert::TryInto`]
3473 * [`iter::successors`]
3474 * [`num::NonZeroI128`]
3475 * [`num::NonZeroI16`]
3476 * [`num::NonZeroI32`]
3477 * [`num::NonZeroI64`]
3478 * [`num::NonZeroI8`]
3479 * [`num::NonZeroIsize`]
3480 * [`slice::sort_by_cached_key`]
3481 * [`str::escape_debug`]
3482 * [`str::escape_default`]
3483 * [`str::escape_unicode`]
3484 * [`str::split_ascii_whitespace`]
3487 * [`Instant::checked_add`]
3488 * [`Instant::checked_sub`]
3489 * [`SystemTime::checked_add`]
3490 * [`SystemTime::checked_sub`]
3494 - [You can now use alternative registries to crates.io.][cargo/6654]
3498 - [You can now use the `?` operator in your documentation tests without manually
3499 adding `fn main() -> Result<(), _> {}`.][56470]
3503 - [`Command::before_exec` is being replaced by the unsafe method
3504 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3505 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3506 can now use `const` functions in `static` variables.
3508 [58370]: https://github.com/rust-lang/rust/pull/58370/
3509 [58406]: https://github.com/rust-lang/rust/pull/58406/
3510 [58421]: https://github.com/rust-lang/rust/pull/58421/
3511 [58166]: https://github.com/rust-lang/rust/pull/58166/
3512 [58044]: https://github.com/rust-lang/rust/pull/58044/
3513 [58057]: https://github.com/rust-lang/rust/pull/58057/
3514 [58059]: https://github.com/rust-lang/rust/pull/58059/
3515 [57809]: https://github.com/rust-lang/rust/pull/57809/
3516 [57873]: https://github.com/rust-lang/rust/pull/57873/
3517 [57604]: https://github.com/rust-lang/rust/pull/57604/
3518 [57367]: https://github.com/rust-lang/rust/pull/57367/
3519 [57407]: https://github.com/rust-lang/rust/pull/57407/
3520 [57425]: https://github.com/rust-lang/rust/pull/57425/
3521 [57106]: https://github.com/rust-lang/rust/pull/57106/
3522 [56470]: https://github.com/rust-lang/rust/pull/56470/
3523 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3524 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3525 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3526 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3527 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3528 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3529 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3530 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3531 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3532 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3533 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3534 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3535 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3536 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3537 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3538 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3539 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3540 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3541 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3542 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3543 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3544 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3545 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3546 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3547 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3548 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3549 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3550 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3551 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3552 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3553 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3556 Version 1.33.0 (2019-02-28)
3557 ==========================
3561 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3562 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3563 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3564 E.g. You can have match statement on a `u8` that covers `0..=255` and
3565 you would no longer be required to have a `_ => unreachable!()` case.
3566 - [You can now have multiple patterns in `if let` and `while let`
3567 expressions.][57532] You can do this with the same syntax as a `match`
3577 let state = Creature::Crab("Ferris");
3579 if let Creature::Crab(name) | Creature::Person(name) = state {
3580 println!("This creature's name is: {}", name);
3584 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3585 this feature will by default produce a warning as this behaviour can be
3586 unintuitive. E.g. `if let _ = 5 {}`
3587 - [You can now use `let` bindings, assignments, expression statements,
3588 and irrefutable pattern destructuring in const functions.][57175]
3589 - [You can now call unsafe const functions.][57067] E.g.
3591 const unsafe fn foo() -> i32 { 5 }
3592 const fn bar() -> i32 {
3596 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3597 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3598 - [You can now specify a specific alignment with the `#[repr(packed)]`
3599 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3600 with an alignment of 2 bytes and a size of 6 bytes.
3601 - [You can now import an item from a module as an `_`.][56303] This allows you to
3602 import a trait's impls, and not have the name in the namespace. E.g.
3604 use std::io::Read as _;
3606 // Allowed as there is only one `Read` in the module.
3609 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3613 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3614 command line argument.][56351]
3615 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3616 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3617 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3618 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3619 information on Rust's platform support.
3620 - [Added support for the `thumbv7neon-linux-androideabi` and
3621 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3622 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3626 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3627 functions for all numeric types.][57566]
3628 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3629 are now `const` functions for all numeric types.][57105]
3630 - [The methods `is_positive` and `is_negative` are now `const` functions for
3631 all signed numeric types.][57105]
3632 - [The `get` method for all `NonZero` types is now `const`.][57167]
3633 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3634 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3635 numeric types.][57234]
3636 - [`Ipv4Addr::new` is now a `const` function][57234]
3640 - [`unix::FileExt::read_exact_at`]
3641 - [`unix::FileExt::write_all_at`]
3642 - [`Option::transpose`]
3643 - [`Result::transpose`]
3644 - [`convert::identity`]
3647 - [`marker::PhantomPinned`]
3648 - [`Vec::resize_with`]
3649 - [`VecDeque::resize_with`]
3650 - [`Duration::as_millis`]
3651 - [`Duration::as_micros`]
3652 - [`Duration::as_nanos`]
3657 - [You can now publish crates that require a feature flag to compile with
3658 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3659 - [Cargo should now rebuild a crate if a file was modified during the initial
3664 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3665 are now deprecated in the standard library, and their usage will now produce a warning.
3666 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3668 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3670 - [Libtest no longer creates a new thread for each test when
3671 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3673 [55982]: https://github.com/rust-lang/rust/pull/55982/
3674 [56243]: https://github.com/rust-lang/rust/pull/56243
3675 [56303]: https://github.com/rust-lang/rust/pull/56303/
3676 [56351]: https://github.com/rust-lang/rust/pull/56351/
3677 [56362]: https://github.com/rust-lang/rust/pull/56362
3678 [56642]: https://github.com/rust-lang/rust/pull/56642/
3679 [56769]: https://github.com/rust-lang/rust/pull/56769/
3680 [56805]: https://github.com/rust-lang/rust/pull/56805
3681 [56947]: https://github.com/rust-lang/rust/pull/56947/
3682 [57049]: https://github.com/rust-lang/rust/pull/57049/
3683 [57067]: https://github.com/rust-lang/rust/pull/57067/
3684 [57105]: https://github.com/rust-lang/rust/pull/57105
3685 [57130]: https://github.com/rust-lang/rust/pull/57130/
3686 [57167]: https://github.com/rust-lang/rust/pull/57167/
3687 [57175]: https://github.com/rust-lang/rust/pull/57175/
3688 [57234]: https://github.com/rust-lang/rust/pull/57234/
3689 [57332]: https://github.com/rust-lang/rust/pull/57332/
3690 [57465]: https://github.com/rust-lang/rust/pull/57465/
3691 [57532]: https://github.com/rust-lang/rust/pull/57532/
3692 [57535]: https://github.com/rust-lang/rust/pull/57535/
3693 [57566]: https://github.com/rust-lang/rust/pull/57566/
3694 [57615]: https://github.com/rust-lang/rust/pull/57615/
3695 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3696 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3697 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3698 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3699 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3700 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3701 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3702 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3703 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3704 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3705 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3706 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3707 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3708 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3709 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3710 [platform-support]: https://forge.rust-lang.org/platform-support.html
3712 Version 1.32.0 (2019-01-17)
3713 ==========================
3718 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3719 operator allows you to specify zero or one repetitions similar to the `*` and
3721 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3722 now always resolve to the item (`enum`, `struct`, etc.) available in the
3723 module if present, before resolving to a external crate or an item the prelude.][56759]
3726 enum Color { Red, Green, Blue }
3732 - [You can now match against `PhantomData<T>` types.][55837]
3733 - [You can now match against literals in macros with the `literal`
3734 specifier.][56072] This will match against a literal of any type.
3735 E.g. `1`, `'A'`, `"Hello World"`
3736 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3738 struct Point(i32, i32);
3741 pub fn new(x: i32, y: i32) -> Self {
3745 pub fn is_origin(&self) -> bool {
3753 - [Self can also now be used in type definitions.][56366] E.g.
3757 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3760 Cons(T, Box<Self>) // likewise here
3763 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3764 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3768 - [The default allocator has changed from jemalloc to the default allocator on
3769 your system.][55238] The compiler itself on Linux & macOS will still use
3770 jemalloc, but programs compiled with it will use the system allocator.
3771 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3775 - [`PathBuf` now implements `FromStr`.][55148]
3776 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3777 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3778 easily debug expressions in your rust program. E.g.
3781 let b = dbg!(a * 2) + 1;
3782 // ^-- prints: [src/main.rs:4] a * 2 = 4
3786 The following APIs are now `const` functions and can be used in a
3790 - [`UnsafeCell::get`]
3791 - [`char::is_ascii`]
3793 - [`ManuallyDrop::new`]
3794 - [`ManuallyDrop::into_inner`]
3795 - [`RangeInclusive::start`]
3796 - [`RangeInclusive::end`]
3797 - [`NonNull::as_ptr`]
3800 - [`Duration::as_secs`]
3801 - [`Duration::subsec_millis`]
3802 - [`Duration::subsec_micros`]
3803 - [`Duration::subsec_nanos`]
3805 - [`Ipv4Addr::is_unspecified`]
3807 - [`Ipv6Addr::octets`]
3811 - [`i8::to_be_bytes`]
3812 - [`i8::to_le_bytes`]
3813 - [`i8::to_ne_bytes`]
3814 - [`i8::from_be_bytes`]
3815 - [`i8::from_le_bytes`]
3816 - [`i8::from_ne_bytes`]
3817 - [`i16::to_be_bytes`]
3818 - [`i16::to_le_bytes`]
3819 - [`i16::to_ne_bytes`]
3820 - [`i16::from_be_bytes`]
3821 - [`i16::from_le_bytes`]
3822 - [`i16::from_ne_bytes`]
3823 - [`i32::to_be_bytes`]
3824 - [`i32::to_le_bytes`]
3825 - [`i32::to_ne_bytes`]
3826 - [`i32::from_be_bytes`]
3827 - [`i32::from_le_bytes`]
3828 - [`i32::from_ne_bytes`]
3829 - [`i64::to_be_bytes`]
3830 - [`i64::to_le_bytes`]
3831 - [`i64::to_ne_bytes`]
3832 - [`i64::from_be_bytes`]
3833 - [`i64::from_le_bytes`]
3834 - [`i64::from_ne_bytes`]
3835 - [`i128::to_be_bytes`]
3836 - [`i128::to_le_bytes`]
3837 - [`i128::to_ne_bytes`]
3838 - [`i128::from_be_bytes`]
3839 - [`i128::from_le_bytes`]
3840 - [`i128::from_ne_bytes`]
3841 - [`isize::to_be_bytes`]
3842 - [`isize::to_le_bytes`]
3843 - [`isize::to_ne_bytes`]
3844 - [`isize::from_be_bytes`]
3845 - [`isize::from_le_bytes`]
3846 - [`isize::from_ne_bytes`]
3847 - [`u8::to_be_bytes`]
3848 - [`u8::to_le_bytes`]
3849 - [`u8::to_ne_bytes`]
3850 - [`u8::from_be_bytes`]
3851 - [`u8::from_le_bytes`]
3852 - [`u8::from_ne_bytes`]
3853 - [`u16::to_be_bytes`]
3854 - [`u16::to_le_bytes`]
3855 - [`u16::to_ne_bytes`]
3856 - [`u16::from_be_bytes`]
3857 - [`u16::from_le_bytes`]
3858 - [`u16::from_ne_bytes`]
3859 - [`u32::to_be_bytes`]
3860 - [`u32::to_le_bytes`]
3861 - [`u32::to_ne_bytes`]
3862 - [`u32::from_be_bytes`]
3863 - [`u32::from_le_bytes`]
3864 - [`u32::from_ne_bytes`]
3865 - [`u64::to_be_bytes`]
3866 - [`u64::to_le_bytes`]
3867 - [`u64::to_ne_bytes`]
3868 - [`u64::from_be_bytes`]
3869 - [`u64::from_le_bytes`]
3870 - [`u64::from_ne_bytes`]
3871 - [`u128::to_be_bytes`]
3872 - [`u128::to_le_bytes`]
3873 - [`u128::to_ne_bytes`]
3874 - [`u128::from_be_bytes`]
3875 - [`u128::from_le_bytes`]
3876 - [`u128::from_ne_bytes`]
3877 - [`usize::to_be_bytes`]
3878 - [`usize::to_le_bytes`]
3879 - [`usize::to_ne_bytes`]
3880 - [`usize::from_be_bytes`]
3881 - [`usize::from_le_bytes`]
3882 - [`usize::from_ne_bytes`]
3886 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3887 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3891 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3895 - [The argument types for AVX's
3896 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3897 been changed from `*const` to `*mut` as the previous implementation
3901 [55148]: https://github.com/rust-lang/rust/pull/55148/
3902 [55238]: https://github.com/rust-lang/rust/pull/55238/
3903 [55280]: https://github.com/rust-lang/rust/pull/55280/
3904 [55610]: https://github.com/rust-lang/rust/pull/55610/
3905 [55663]: https://github.com/rust-lang/rust/pull/55663/
3906 [55702]: https://github.com/rust-lang/rust/pull/55702/
3907 [55837]: https://github.com/rust-lang/rust/pull/55837/
3908 [55843]: https://github.com/rust-lang/rust/pull/55843/
3909 [56072]: https://github.com/rust-lang/rust/pull/56072/
3910 [56245]: https://github.com/rust-lang/rust/pull/56245/
3911 [56365]: https://github.com/rust-lang/rust/pull/56365/
3912 [56366]: https://github.com/rust-lang/rust/pull/56366/
3913 [56395]: https://github.com/rust-lang/rust/pull/56395/
3914 [56759]: https://github.com/rust-lang/rust/pull/56759/
3915 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3916 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3917 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3918 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3919 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3920 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3921 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3922 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3923 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3924 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3925 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3926 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3927 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3928 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3929 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3930 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3931 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3932 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3933 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3934 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3935 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3936 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3937 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3938 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3939 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3940 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3941 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3942 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3943 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3944 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3945 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3946 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3947 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3948 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3949 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3950 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3951 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3952 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3953 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3954 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3955 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3956 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3957 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3958 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3959 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3960 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3961 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3962 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3963 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3964 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3965 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3966 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3967 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3968 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3969 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3970 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3971 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3972 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3973 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3974 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3975 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3976 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3977 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3978 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3979 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3980 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3981 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3982 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3983 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3984 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3985 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3986 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3987 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3988 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3989 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3990 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3991 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3992 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3993 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3994 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3995 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3996 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3997 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3998 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3999 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4000 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4001 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4002 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4003 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4004 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4005 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4006 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4007 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4010 Version 1.31.1 (2018-12-20)
4011 ===========================
4013 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4014 - [Fix broken go-to-definition in RLS][rls/1171]
4015 - [Fix infinite loop on hover in RLS][rls/1170]
4017 [56562]: https://github.com/rust-lang/rust/pull/56562
4018 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4019 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4021 Version 1.31.0 (2018-12-06)
4022 ==========================
4026 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4027 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4028 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4029 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4031 - [You can now define and use `const` functions.][54835] These are currently
4032 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4033 [language reference][const-reference] for what exactly is available.
4034 - [You can now use tool lints, which allow you to scope lints from external
4035 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4036 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4037 a crate, not just in exported functions.][54451]
4038 - [You can now use parentheses in pattern matches.][54497]
4042 - [Updated musl to 1.1.20][54430]
4046 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4047 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4048 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4049 into `Option<&mut T>` using the `From` trait.][53218]
4050 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4055 - [`slice::align_to`]
4056 - [`slice::align_to_mut`]
4057 - [`slice::chunks_exact`]
4058 - [`slice::chunks_exact_mut`]
4059 - [`slice::rchunks`]
4060 - [`slice::rchunks_mut`]
4061 - [`slice::rchunks_exact`]
4062 - [`slice::rchunks_exact_mut`]
4063 - [`Option::replace`]
4067 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4068 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4069 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4071 [52813]: https://github.com/rust-lang/rust/pull/52813/
4072 [53218]: https://github.com/rust-lang/rust/pull/53218/
4073 [53555]: https://github.com/rust-lang/rust/issues/53555/
4074 [54057]: https://github.com/rust-lang/rust/pull/54057/
4075 [54240]: https://github.com/rust-lang/rust/pull/54240/
4076 [54430]: https://github.com/rust-lang/rust/pull/54430/
4077 [54451]: https://github.com/rust-lang/rust/pull/54451/
4078 [54497]: https://github.com/rust-lang/rust/pull/54497/
4079 [54778]: https://github.com/rust-lang/rust/pull/54778/
4080 [54835]: https://github.com/rust-lang/rust/pull/54835/
4081 [54870]: https://github.com/rust-lang/rust/pull/54870/
4082 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4083 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4084 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4085 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4086 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4087 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4088 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4089 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4090 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4091 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4092 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4093 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4094 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4095 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4097 Version 1.30.1 (2018-11-08)
4098 ===========================
4100 - [Fixed overflow ICE in rustdoc][54199]
4101 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4103 [54199]: https://github.com/rust-lang/rust/pull/54199
4104 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4106 Version 1.30.0 (2018-10-25)
4107 ==========================
4111 - [Procedural macros are now available.][52081] These kinds of macros allow for
4112 more powerful code generation. There is a [new chapter available][proc-macros]
4113 in the Rust Programming Language book that goes further in depth.
4114 - [You can now use keywords as identifiers using the raw identifiers
4115 syntax (`r#`),][53236] e.g. `let r#for = true;`
4116 - [Using anonymous parameters in traits is now deprecated with a warning and
4117 will be a hard error in the 2018 edition.][53272]
4118 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4119 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4120 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4121 Previously, using a external crate in a module without a use statement
4122 required `let json = ::serde_json::from_str(foo);` but can now be written
4123 as `let json = serde_json::from_str(foo);`.
4124 - [You can now apply the `#[used]` attribute to static items to prevent the
4125 compiler from optimising them away, even if they appear to be unused,][51363]
4126 e.g. `#[used] static FOO: u32 = 1;`
4127 - [You can now import and reexport macros from other crates with the `use`
4128 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4129 the root module of the crate. If your macro relies on calling other local
4130 macros, it is recommended to export with the
4131 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4133 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4134 using the `vis` specifier.][53370]
4135 - [Non-macro attributes now allow all forms of literals, not just
4136 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4137 write `#[attr(true)]`.
4138 - [You can now specify a function to handle a panic in the Rust runtime with the
4139 `#[panic_handler]` attribute.][51366]
4143 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4144 - [Added the `aarch64-unknown-netbsd` target][53165]
4145 - [Upgraded to LLVM 8.][53611]
4149 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4153 - [`Ipv4Addr::BROADCAST`]
4154 - [`Ipv4Addr::LOCALHOST`]
4155 - [`Ipv4Addr::UNSPECIFIED`]
4156 - [`Ipv6Addr::LOCALHOST`]
4157 - [`Ipv6Addr::UNSPECIFIED`]
4158 - [`Iterator::find_map`]
4160 The following methods are replacement methods for `trim_left`, `trim_right`,
4161 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4163 - [`str::trim_end_matches`]
4165 - [`str::trim_start_matches`]
4166 - [`str::trim_start`]
4170 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4171 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4172 equivalent to calling `rustdoc --error-format=json`.
4173 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4177 - [`rustdoc` allows you to specify what edition to treat your code as with the
4178 `--edition` option.][54057]
4179 - [`rustdoc` now has the `--color` (specify whether to output color) and
4180 `--error-format` (specify error format, e.g. `json`) options.][53003]
4181 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4182 debug symbols.][53774]
4183 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4184 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4186 [50911]: https://github.com/rust-lang/rust/pull/50911/
4187 [51363]: https://github.com/rust-lang/rust/pull/51363/
4188 [51366]: https://github.com/rust-lang/rust/pull/51366/
4189 [52081]: https://github.com/rust-lang/rust/pull/52081/
4190 [53003]: https://github.com/rust-lang/rust/pull/53003/
4191 [53033]: https://github.com/rust-lang/rust/pull/53033/
4192 [53044]: https://github.com/rust-lang/rust/pull/53044/
4193 [53165]: https://github.com/rust-lang/rust/pull/53165/
4194 [53611]: https://github.com/rust-lang/rust/pull/53611/
4195 [53213]: https://github.com/rust-lang/rust/pull/53213/
4196 [53236]: https://github.com/rust-lang/rust/pull/53236/
4197 [53272]: https://github.com/rust-lang/rust/pull/53272/
4198 [53370]: https://github.com/rust-lang/rust/pull/53370/
4199 [53459]: https://github.com/rust-lang/rust/pull/53459/
4200 [53774]: https://github.com/rust-lang/rust/pull/53774/
4201 [53822]: https://github.com/rust-lang/rust/pull/53822/
4202 [54057]: https://github.com/rust-lang/rust/pull/54057/
4203 [54146]: https://github.com/rust-lang/rust/pull/54146/
4204 [54404]: https://github.com/rust-lang/rust/pull/54404/
4205 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4206 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4207 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4208 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4210 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4211 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4212 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4213 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4214 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4215 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4216 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4217 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4218 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4219 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4222 Version 1.29.2 (2018-10-11)
4223 ===========================
4225 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4226 - The `rls-preview` component on the windows-gnu targets has been restored.
4228 [54639]: https://github.com/rust-lang/rust/pull/54639
4231 Version 1.29.1 (2018-09-25)
4232 ===========================
4237 - The standard library's `str::repeat` function contained an out of bounds write
4238 caused by an integer overflow. This has been fixed by deterministically
4239 panicking when an overflow happens.
4241 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4245 Version 1.29.0 (2018-09-13)
4246 ==========================
4250 - [Bumped minimum LLVM version to 5.0.][51899]
4251 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4252 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4253 - [Upgraded to LLVM 7.][51966]
4257 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4258 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4259 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4260 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4262 - [`Cell<T>` now allows `T` to be unsized.][50494]
4263 - [`SocketAddr` is now stable on Redox.][52656]
4268 - [`Iterator::flatten`]
4273 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4274 `--locked` to disable this behavior.
4275 - [`cargo-install` will now allow you to cross compile an install
4276 using `--target`.][cargo/5614]
4277 - [Added the `cargo-fix` subcommand to automatically move project code from
4278 2015 edition to 2018.][cargo/5723]
4279 - [`cargo doc` can now optionally document private types using the
4280 `--document-private-items` flag.][cargo/5543]
4284 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4285 the specified level to that level.][52354] For example `--cap-lints warn`
4286 will demote `deny` and `forbid` lints to `warn`.
4287 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4288 fails and `101` if there is a panic.][52197]
4289 - [A preview of clippy has been made available through rustup.][51122]
4290 You can install the preview with `rustup component add clippy-preview`.
4294 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4295 Use `str::get_unchecked(begin..end)` instead.
4296 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4297 Consider using the `home_dir` function from
4298 https://crates.io/crates/dirs instead.
4299 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4300 - [`cfg` attributes and `--cfg` command line flags are now more
4301 strictly validated.][53893]
4303 [53893]: https://github.com/rust-lang/rust/pull/53893/
4304 [52861]: https://github.com/rust-lang/rust/pull/52861/
4305 [51966]: https://github.com/rust-lang/rust/pull/51966/
4306 [52656]: https://github.com/rust-lang/rust/pull/52656/
4307 [52239]: https://github.com/rust-lang/rust/pull/52239/
4308 [52330]: https://github.com/rust-lang/rust/pull/52330/
4309 [52354]: https://github.com/rust-lang/rust/pull/52354/
4310 [52402]: https://github.com/rust-lang/rust/pull/52402/
4311 [52103]: https://github.com/rust-lang/rust/pull/52103/
4312 [52197]: https://github.com/rust-lang/rust/pull/52197/
4313 [51807]: https://github.com/rust-lang/rust/pull/51807/
4314 [51899]: https://github.com/rust-lang/rust/pull/51899/
4315 [51912]: https://github.com/rust-lang/rust/pull/51912/
4316 [51511]: https://github.com/rust-lang/rust/pull/51511/
4317 [51619]: https://github.com/rust-lang/rust/pull/51619/
4318 [51656]: https://github.com/rust-lang/rust/pull/51656/
4319 [51178]: https://github.com/rust-lang/rust/pull/51178/
4320 [51122]: https://github.com/rust-lang/rust/pull/51122
4321 [50494]: https://github.com/rust-lang/rust/pull/50494/
4322 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4323 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4324 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4325 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4326 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4327 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4328 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4331 Version 1.28.0 (2018-08-02)
4332 ===========================
4336 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4337 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4338 the inner type across Foreign Function Interface (FFI) boundaries.
4339 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4340 and can now be used as identifiers.][51196]
4341 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4342 stable.][51241] This will allow users to specify a global allocator for
4344 - [Unit test functions marked with the `#[test]` attribute can now return
4345 `Result<(), E: Debug>` in addition to `()`.][51298]
4346 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4347 allows macros to easily target lifetimes.
4351 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4352 prioritise making smaller binary sizes. `z` is the same as `s` with the
4353 exception that it does not vectorise loops, which typically results in an even
4355 - [The short error format is now stable.][49546] Specified with
4356 `--error-format=short` this option will provide a more compressed output of
4357 rust error messages.
4358 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4359 - [Reduced the number of allocations in the macro parser.][50855] This can
4360 improve compile times of macro heavy crates on average by 5%.
4364 - [Implemented `Default` for `&mut str`.][51306]
4365 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4366 - [Implemented `Extend` for `()`.][50234]
4367 - [The `Debug` implementation of `time::Duration` should now be more easily
4368 human readable.][50364] Previously a `Duration` of one second would printed as
4369 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4370 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4371 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4372 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4373 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4374 for `PathBuf`.][50170]
4375 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4376 and `Wrapping<i128>`.][50465]
4377 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4378 possible.][51050] This can provide up to a 40% speed increase.
4379 - [Improved error messages when using `format!`.][50610]
4383 - [`Iterator::step_by`]
4384 - [`Path::ancestors`]
4385 - [`SystemTime::UNIX_EPOCH`]
4386 - [`alloc::GlobalAlloc`]
4388 - [`alloc::LayoutErr`]
4391 - [`alloc::alloc_zeroed`]
4392 - [`alloc::dealloc`]
4393 - [`alloc::realloc`]
4394 - [`alloc::handle_alloc_error`]
4395 - [`btree_map::Entry::or_default`]
4396 - [`fmt::Alignment`]
4397 - [`hash_map::Entry::or_default`]
4398 - [`iter::repeat_with`]
4399 - [`num::NonZeroUsize`]
4400 - [`num::NonZeroU128`]
4401 - [`num::NonZeroU16`]
4402 - [`num::NonZeroU32`]
4403 - [`num::NonZeroU64`]
4404 - [`num::NonZeroU8`]
4405 - [`ops::RangeBounds`]
4406 - [`slice::SliceIndex`]
4407 - [`slice::from_mut`]
4408 - [`slice::from_ref`]
4409 - [`{Any + Send + Sync}::downcast_mut`]
4410 - [`{Any + Send + Sync}::downcast_ref`]
4411 - [`{Any + Send + Sync}::is`]
4415 - [Cargo will now no longer allow you to publish crates with build scripts that
4416 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4417 considered to be immutable.
4421 - [The `suggestion_applicability` field in `rustc`'s json output is now
4422 stable.][50486] This will allow dev tools to check whether a code suggestion
4423 would apply to them.
4427 - [Rust will consider trait objects with duplicated constraints to be the same
4428 type as without the duplicated constraint.][51276] For example the below code will
4429 now fail to compile.
4434 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4437 impl Trait + Send + Send {
4438 fn test(&self) { println!("two"); }
4442 [49546]: https://github.com/rust-lang/rust/pull/49546/
4443 [50143]: https://github.com/rust-lang/rust/pull/50143/
4444 [50170]: https://github.com/rust-lang/rust/pull/50170/
4445 [50234]: https://github.com/rust-lang/rust/pull/50234/
4446 [50265]: https://github.com/rust-lang/rust/pull/50265/
4447 [50364]: https://github.com/rust-lang/rust/pull/50364/
4448 [50385]: https://github.com/rust-lang/rust/pull/50385/
4449 [50465]: https://github.com/rust-lang/rust/pull/50465/
4450 [50486]: https://github.com/rust-lang/rust/pull/50486/
4451 [50554]: https://github.com/rust-lang/rust/pull/50554/
4452 [50610]: https://github.com/rust-lang/rust/pull/50610/
4453 [50855]: https://github.com/rust-lang/rust/pull/50855/
4454 [51050]: https://github.com/rust-lang/rust/pull/51050/
4455 [51196]: https://github.com/rust-lang/rust/pull/51196/
4456 [51200]: https://github.com/rust-lang/rust/pull/51200/
4457 [51241]: https://github.com/rust-lang/rust/pull/51241/
4458 [51276]: https://github.com/rust-lang/rust/pull/51276/
4459 [51298]: https://github.com/rust-lang/rust/pull/51298/
4460 [51306]: https://github.com/rust-lang/rust/pull/51306/
4461 [51562]: https://github.com/rust-lang/rust/pull/51562/
4462 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4463 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4464 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4465 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4466 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4467 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4468 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4469 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4470 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4471 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4472 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4473 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4474 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4475 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4476 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4477 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4478 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4479 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4480 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4481 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4482 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4483 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4484 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4485 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4486 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4487 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4488 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4489 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4490 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4491 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4493 Version 1.27.2 (2018-07-20)
4494 ===========================
4499 - The borrow checker was fixed to avoid potential unsoundness when using
4500 match ergonomics: [#52213][52213].
4502 [52213]: https://github.com/rust-lang/rust/issues/52213
4504 Version 1.27.1 (2018-07-10)
4505 ===========================
4510 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4511 when running, which enabled executing code as some other user on a
4512 given machine. This release fixes that vulnerability; you can read
4513 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4515 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4520 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4521 match ergonomics: [#51415][51415], [#49534][49534].
4523 [51415]: https://github.com/rust-lang/rust/issues/51415
4524 [49534]: https://github.com/rust-lang/rust/issues/49534
4525 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4526 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4528 Version 1.27.0 (2018-06-21)
4529 ==========================
4533 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4534 be used as an identifier.
4535 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4536 bare `Trait` syntax, and should make it clearer when being used in tandem with
4537 `impl Trait` because it is equivalent to the following syntax:
4538 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4539 `Box<Trait> == Box<dyn Trait>`.
4540 - [Attributes on generic parameters such as types and lifetimes are
4541 now stable.][48851] e.g.
4542 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4543 - [The `#[must_use]` attribute can now also be used on functions as well as
4544 types.][48925] It provides a lint that by default warns users when the
4545 value returned by a function has not been used.
4549 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4553 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4554 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4555 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4556 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4557 the `cfg` attribute.
4558 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4559 std are now available in core.][49896]
4560 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4562 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4563 that the operation isn't done in place.
4564 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4565 the `#[must_use]` attribute][49533] to warn about unused potentially
4566 expensive allocations.
4570 - [`DoubleEndedIterator::rfind`]
4571 - [`DoubleEndedIterator::rfold`]
4572 - [`DoubleEndedIterator::try_rfold`]
4573 - [`Duration::from_micros`]
4574 - [`Duration::from_nanos`]
4575 - [`Duration::subsec_micros`]
4576 - [`Duration::subsec_millis`]
4577 - [`HashMap::remove_entry`]
4578 - [`Iterator::try_fold`]
4579 - [`Iterator::try_for_each`]
4581 - [`Option::filter`]
4582 - [`String::replace_range`]
4583 - [`Take::set_limit`]
4584 - [`hint::unreachable_unchecked`]
4585 - [`os::unix::process::parent_id`]
4586 - [`ptr::swap_nonoverlapping`]
4587 - [`slice::rsplit_mut`]
4589 - [`slice::swap_with_slice`]
4593 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4594 `readme`, and `repository` fields.][cargo/5386]
4595 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4596 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4597 a different directory than `target` for placing compilation artifacts.
4598 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4599 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4600 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4601 where cargo would infer a binary, Cargo will produce a warning. You can
4602 disable this feature ahead of time by setting any of the following to false:
4603 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4604 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4605 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4609 - [Added “The Rustc book” into the official documentation.][49707]
4610 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4611 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4615 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4616 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4617 compile, `"".is_empty()` will still compile.
4618 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4619 will only print the inner type.][48553] E.g.
4620 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4621 not `AtomicBool(true)`.
4622 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4623 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4624 alignment should cover all use cases.
4625 - The `.description()` method on the `std::error::Error` trait
4626 [has been soft-deprecated][50163]. It is no longer required to implement it.
4628 [48553]: https://github.com/rust-lang/rust/pull/48553/
4629 [48851]: https://github.com/rust-lang/rust/pull/48851/
4630 [48925]: https://github.com/rust-lang/rust/pull/48925/
4631 [49533]: https://github.com/rust-lang/rust/pull/49533/
4632 [49623]: https://github.com/rust-lang/rust/pull/49623/
4633 [49630]: https://github.com/rust-lang/rust/pull/49630/
4634 [49664]: https://github.com/rust-lang/rust/pull/49664/
4635 [49699]: https://github.com/rust-lang/rust/pull/49699/
4636 [49707]: https://github.com/rust-lang/rust/pull/49707/
4637 [49719]: https://github.com/rust-lang/rust/pull/49719/
4638 [49896]: https://github.com/rust-lang/rust/pull/49896/
4639 [49968]: https://github.com/rust-lang/rust/pull/49968/
4640 [50163]: https://github.com/rust-lang/rust/pull/50163
4641 [50177]: https://github.com/rust-lang/rust/pull/50177/
4642 [50378]: https://github.com/rust-lang/rust/pull/50378/
4643 [50398]: https://github.com/rust-lang/rust/pull/50398/
4644 [50423]: https://github.com/rust-lang/rust/pull/50423/
4645 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
4646 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4647 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4648 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4649 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4650 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4651 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4652 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4653 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4654 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4655 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4656 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4657 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4658 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4659 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4660 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4661 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4662 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4663 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4664 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4665 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4666 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4667 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4668 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4669 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4670 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4671 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4672 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4673 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4674 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4677 Version 1.26.2 (2018-06-05)
4678 ==========================
4683 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4685 [51117]: https://github.com/rust-lang/rust/issues/51117
4688 Version 1.26.1 (2018-05-29)
4689 ==========================
4694 - [RLS now works on Windows.][50646]
4695 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4701 - [`fn main() -> impl Trait` no longer works for non-Termination
4703 This reverts an accidental stabilization.
4704 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4705 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4707 [50646]: https://github.com/rust-lang/rust/issues/50646
4708 [50656]: https://github.com/rust-lang/rust/pull/50656
4709 [50812]: https://github.com/rust-lang/rust/pull/50812
4710 [50950]: https://github.com/rust-lang/rust/issues/50950
4711 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4713 Version 1.26.0 (2018-05-10)
4714 ==========================
4718 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4719 implement either or both traits.][49299]
4720 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4721 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4722 lifetime can be elided.][49458]
4723 - [`impl Trait` is now stable allowing you to have abstract types in returns
4724 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4725 `fn open(path: impl AsRef<Path>)`.
4726 - [Pattern matching will now automatically apply dereferences.][49394]
4727 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4728 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4729 - [A lot of operations are now available in a const context.][46882] E.g. You
4730 can now index into constant arrays, reference and dereference into constants,
4731 and use tuple struct constructors.
4732 - [Fixed entry slice patterns are now stable.][48516] E.g.
4734 let points = [1, 2, 3, 4];
4736 [1, 2, 3, 4] => println!("All points were sequential."),
4737 _ => println!("Not all points were sequential."),
4744 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4745 - [Fixed exponential projection complexity on nested types.][48296]
4746 This can provide up to a ~12% reduction in compile times for certain crates.
4747 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4748 to remap path prefixes outputted by the compiler.
4749 - [Added `powerpc-unknown-netbsd` target.][48281]
4753 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4754 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4755 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4756 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4757 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4758 - [`ascii::escape_default` is now available in libcore.][48735]
4759 - [Trailing commas are now supported in std and core macros.][48056]
4760 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4761 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4766 - [`*const T::copy_to_nonoverlapping`]
4767 - [`*const T::copy_to`]
4768 - [`*const T::read_unaligned`]
4769 - [`*const T::read_volatile`]
4770 - [`*const T::read`]
4772 - [`*const T::wrapping_add`]
4773 - [`*const T::wrapping_sub`]
4775 - [`*mut T::copy_to_nonoverlapping`]
4776 - [`*mut T::copy_to`]
4777 - [`*mut T::read_unaligned`]
4778 - [`*mut T::read_volatile`]
4780 - [`*mut T::replace`]
4783 - [`*mut T::wrapping_add`]
4784 - [`*mut T::wrapping_sub`]
4785 - [`*mut T::write_bytes`]
4786 - [`*mut T::write_unaligned`]
4787 - [`*mut T::write_volatile`]
4790 - [`FromUtf8Error::as_bytes`]
4791 - [`LocalKey::try_with`]
4792 - [`Option::cloned`]
4793 - [`btree_map::Entry::and_modify`]
4794 - [`fs::read_to_string`]
4797 - [`hash_map::Entry::and_modify`]
4798 - [`iter::FusedIterator`]
4799 - [`ops::RangeInclusive`]
4800 - [`ops::RangeToInclusive`]
4802 - [`slice::rotate_left`]
4803 - [`slice::rotate_right`]
4804 - [`String::retain`]
4809 - [Cargo will now output path to custom commands when `-v` is
4810 passed with `--list`][cargo/5041]
4811 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4815 - [The second edition of "The Rust Programming Language" book is now recommended
4816 over the first.][48404]
4821 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4822 syntax is now invalid.
4824 use std::ops::Fn as dyn;
4825 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4827 - [The result of dereferences are no longer promoted to `'static`.][47408]
4831 const PAIR: &(i32, i32) = &(0, 1);
4832 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4835 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4836 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4838 - [Removed hoedown from rustdoc.][48274]
4839 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4841 [46882]: https://github.com/rust-lang/rust/pull/46882
4842 [47379]: https://github.com/rust-lang/rust/pull/47379
4843 [47408]: https://github.com/rust-lang/rust/pull/47408
4844 [47813]: https://github.com/rust-lang/rust/pull/47813
4845 [48056]: https://github.com/rust-lang/rust/pull/48056
4846 [48125]: https://github.com/rust-lang/rust/pull/48125
4847 [48166]: https://github.com/rust-lang/rust/pull/48166
4848 [48235]: https://github.com/rust-lang/rust/pull/48235
4849 [48274]: https://github.com/rust-lang/rust/pull/48274
4850 [48281]: https://github.com/rust-lang/rust/pull/48281
4851 [48296]: https://github.com/rust-lang/rust/pull/48296
4852 [48326]: https://github.com/rust-lang/rust/pull/48326
4853 [48359]: https://github.com/rust-lang/rust/pull/48359
4854 [48404]: https://github.com/rust-lang/rust/pull/48404
4855 [48481]: https://github.com/rust-lang/rust/pull/48481
4856 [48516]: https://github.com/rust-lang/rust/pull/48516
4857 [48628]: https://github.com/rust-lang/rust/pull/48628
4858 [48629]: https://github.com/rust-lang/rust/pull/48629
4859 [48657]: https://github.com/rust-lang/rust/pull/48657
4860 [48735]: https://github.com/rust-lang/rust/pull/48735
4861 [48978]: https://github.com/rust-lang/rust/pull/48978
4862 [49101]: https://github.com/rust-lang/rust/pull/49101
4863 [49109]: https://github.com/rust-lang/rust/pull/49109
4864 [49121]: https://github.com/rust-lang/rust/pull/49121
4865 [49162]: https://github.com/rust-lang/rust/pull/49162
4866 [49184]: https://github.com/rust-lang/rust/pull/49184
4867 [49234]: https://github.com/rust-lang/rust/pull/49234
4868 [49255]: https://github.com/rust-lang/rust/pull/49255
4869 [49299]: https://github.com/rust-lang/rust/pull/49299
4870 [49305]: https://github.com/rust-lang/rust/pull/49305
4871 [49394]: https://github.com/rust-lang/rust/pull/49394
4872 [49458]: https://github.com/rust-lang/rust/pull/49458
4873 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4874 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4875 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4876 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4877 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4878 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4879 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4880 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4881 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4882 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4883 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4884 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4885 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4886 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4887 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4888 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4889 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4890 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4891 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4892 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4893 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4894 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4895 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4896 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4897 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4898 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4899 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4900 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4901 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4902 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4903 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4904 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4905 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4906 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4907 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4908 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4909 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4910 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4911 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4912 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4913 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4914 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4917 Version 1.25.0 (2018-03-29)
4918 ==========================
4922 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4923 - [You can now use nested groups of imports.][47948]
4924 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4925 - [You can now have `|` at the start of a match arm.][47947] e.g.
4927 enum Foo { A, B, C }
4933 | Foo::B => println!("AB"),
4934 | Foo::C => println!("C"),
4941 - [Upgraded to LLVM 6.][47828]
4942 - [Added `-C lto=val` option.][47521]
4943 - [Added `i586-unknown-linux-musl` target][47282]
4947 - [Impl Send for `process::Command` on Unix.][47760]
4948 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4949 - [`UnsafeCell::into_inner` is now safe.][47204]
4950 - [Implement libstd for CloudABI.][47268]
4951 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4952 - [Implement `AsRef<Path>` for Component][46985]
4953 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4954 - [Moved `Duration` to libcore.][46666]
4958 - [`Location::column`]
4961 The following functions can now be used in a constant expression.
4962 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4963 - [`Duration::new`][47300]
4964 - [`Duration::from_secs`][47300]
4965 - [`Duration::from_millis`][47300]
4969 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4970 - [`cargo new` now defaults to creating a binary crate, instead of a
4971 library crate.][cargo/5029]
4975 - [Rust by example is now shipped with new releases][46196]
4979 - [Deprecated `net::lookup_host`.][47510]
4980 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4981 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4982 around indexing operations (see [#47349][47349]). This has been fixed (which also
4983 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4984 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4986 [33903]: https://github.com/rust-lang/rust/pull/33903
4987 [47947]: https://github.com/rust-lang/rust/pull/47947
4988 [47948]: https://github.com/rust-lang/rust/pull/47948
4989 [47760]: https://github.com/rust-lang/rust/pull/47760
4990 [47790]: https://github.com/rust-lang/rust/pull/47790
4991 [47828]: https://github.com/rust-lang/rust/pull/47828
4992 [47398]: https://github.com/rust-lang/rust/pull/47398
4993 [47510]: https://github.com/rust-lang/rust/pull/47510
4994 [47521]: https://github.com/rust-lang/rust/pull/47521
4995 [47204]: https://github.com/rust-lang/rust/pull/47204
4996 [47251]: https://github.com/rust-lang/rust/pull/47251
4997 [47268]: https://github.com/rust-lang/rust/pull/47268
4998 [47282]: https://github.com/rust-lang/rust/pull/47282
4999 [47300]: https://github.com/rust-lang/rust/pull/47300
5000 [47349]: https://github.com/rust-lang/rust/pull/47349
5001 [46931]: https://github.com/rust-lang/rust/pull/46931
5002 [46985]: https://github.com/rust-lang/rust/pull/46985
5003 [47006]: https://github.com/rust-lang/rust/pull/47006
5004 [46830]: https://github.com/rust-lang/rust/pull/46830
5005 [46095]: https://github.com/rust-lang/rust/pull/46095
5006 [46666]: https://github.com/rust-lang/rust/pull/46666
5007 [46196]: https://github.com/rust-lang/rust/pull/46196
5008 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5009 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5010 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5011 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5012 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5015 Version 1.24.1 (2018-03-01)
5016 ==========================
5018 - [Do not abort when unwinding through FFI][48251]
5019 - [Emit UTF-16 files for linker arguments on Windows][48318]
5020 - [Make the error index generator work again][48308]
5021 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5023 [48251]: https://github.com/rust-lang/rust/issues/48251
5024 [48308]: https://github.com/rust-lang/rust/issues/48308
5025 [48318]: https://github.com/rust-lang/rust/issues/48318
5026 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5029 Version 1.24.0 (2018-02-15)
5030 ==========================
5034 - [External `sysv64` ffi is now available.][46528]
5035 eg. `extern "sysv64" fn foo () {}`
5039 - [rustc now uses 16 codegen units by default for release builds.][46910]
5040 For the fastest builds, utilize `codegen-units=1`.
5041 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5042 - [Add `aarch64-unknown-openbsd` support][46760]
5046 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5047 improvement in performance in the majority of cases.
5048 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5049 with Windows.][46798]
5050 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5051 - [impl `From<bool>` for `AtomicBool`][46293]
5052 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5053 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5054 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5055 - [float::from_bits now just uses transmute.][46012] This provides
5056 some optimisations from LLVM.
5057 - [Copied `AsciiExt` methods onto `char`][46077]
5058 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5059 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5060 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5061 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5065 - [`RefCell::replace`]
5067 - [`atomic::spin_loop_hint`]
5069 The following functions can now be used in a constant expression.
5070 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5072 - [`AtomicBool::new`][46287]
5073 - [`AtomicUsize::new`][46287]
5074 - [`AtomicIsize::new`][46287]
5075 - [`AtomicPtr::new`][46287]
5076 - [`Cell::new`][46287]
5077 - [`{integer}::min_value`][46287]
5078 - [`{integer}::max_value`][46287]
5079 - [`mem::size_of`][46287]
5080 - [`mem::align_of`][46287]
5081 - [`ptr::null`][46287]
5082 - [`ptr::null_mut`][46287]
5083 - [`RefCell::new`][46287]
5084 - [`UnsafeCell::new`][46287]
5088 - [Added a `workspace.default-members` config that
5089 overrides implied `--all` in virtual workspaces.][cargo/4743]
5090 - [Enable incremental by default on development builds.][cargo/4817] Also added
5091 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5092 per-project or global basis respectively.
5099 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5100 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5101 in accordance with IETF RFC 4291 §2.2.
5102 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5103 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5104 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5105 - [Leading zeros in tuple struct members is now an error][47084]
5106 - [`column!()` macro is one-based instead of zero-based][46977]
5107 - [`fmt::Arguments` can no longer be shared across threads][45198]
5108 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5109 - [Cargo sets a different working directory for the compiler][cargo/4788]
5111 [44884]: https://github.com/rust-lang/rust/pull/44884
5112 [45198]: https://github.com/rust-lang/rust/pull/45198
5113 [45506]: https://github.com/rust-lang/rust/pull/45506
5114 [45904]: https://github.com/rust-lang/rust/pull/45904
5115 [45990]: https://github.com/rust-lang/rust/pull/45990
5116 [46012]: https://github.com/rust-lang/rust/pull/46012
5117 [46077]: https://github.com/rust-lang/rust/pull/46077
5118 [46094]: https://github.com/rust-lang/rust/pull/46094
5119 [46284]: https://github.com/rust-lang/rust/pull/46284
5120 [46287]: https://github.com/rust-lang/rust/pull/46287
5121 [46293]: https://github.com/rust-lang/rust/pull/46293
5122 [46528]: https://github.com/rust-lang/rust/pull/46528
5123 [46671]: https://github.com/rust-lang/rust/pull/46671
5124 [46713]: https://github.com/rust-lang/rust/pull/46713
5125 [46735]: https://github.com/rust-lang/rust/pull/46735
5126 [46749]: https://github.com/rust-lang/rust/pull/46749
5127 [46760]: https://github.com/rust-lang/rust/pull/46760
5128 [46798]: https://github.com/rust-lang/rust/pull/46798
5129 [46828]: https://github.com/rust-lang/rust/pull/46828
5130 [46831]: https://github.com/rust-lang/rust/pull/46831
5131 [46833]: https://github.com/rust-lang/rust/pull/46833
5132 [46910]: https://github.com/rust-lang/rust/pull/46910
5133 [46977]: https://github.com/rust-lang/rust/pull/46977
5134 [47018]: https://github.com/rust-lang/rust/pull/47018
5135 [47080]: https://github.com/rust-lang/rust/pull/47080
5136 [47084]: https://github.com/rust-lang/rust/pull/47084
5137 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5138 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5139 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5140 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5141 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5142 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5145 Version 1.23.0 (2018-01-04)
5146 ==========================
5150 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5151 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5152 Which should fix some confusing errors in some operations.
5156 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5157 undefined behavior.][45920]
5158 - [rustc now suggests renaming import if names clash.][45660]
5159 - [Display errors/warnings correctly when there are zero-width or
5160 wide characters.][45711]
5161 - [rustc now avoids unnecessary copies of arguments that are
5162 simple bindings][45380] This should improve memory usage on average by 5-10%.
5163 - [Updated musl used to build musl rustc to 1.1.17][45393]
5167 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5168 - [Implement Hash for raw pointers to unsized types][45483]
5169 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5170 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5171 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5172 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5173 and `<*mut T>::as_mut`][44932]
5174 - [Optimized `Thread::{park, unpark}` implementation][45524]
5175 - [Improved `SliceExt::binary_search` performance.][45333]
5176 - [impl `FromIterator<()>` for `()`][45379]
5177 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5185 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5186 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5187 - [Added unit test checking to `cargo check`][cargo/4592]
5188 - [Cargo now lets you install a specific version
5189 using `cargo install --version`][cargo/4637]
5193 - [Releases now ship with the Cargo book documentation.][45692]
5194 - [rustdoc now prints rendering warnings on every run.][45324]
5198 - [Changes have been made to type equality to make it more correct,
5199 in rare cases this could break some code.][45853] [Tracking issue for
5200 further information][45852]
5201 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5202 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5203 Android 9, the minimum supported version is Android 14.
5204 - [Bumped the minimum LLVM to 3.9][45326]
5206 [44042]: https://github.com/rust-lang/rust/pull/44042
5207 [44932]: https://github.com/rust-lang/rust/pull/44932
5208 [45267]: https://github.com/rust-lang/rust/pull/45267
5209 [45324]: https://github.com/rust-lang/rust/pull/45324
5210 [45326]: https://github.com/rust-lang/rust/pull/45326
5211 [45333]: https://github.com/rust-lang/rust/pull/45333
5212 [45379]: https://github.com/rust-lang/rust/pull/45379
5213 [45380]: https://github.com/rust-lang/rust/pull/45380
5214 [45393]: https://github.com/rust-lang/rust/pull/45393
5215 [45435]: https://github.com/rust-lang/rust/pull/45435
5216 [45483]: https://github.com/rust-lang/rust/pull/45483
5217 [45524]: https://github.com/rust-lang/rust/pull/45524
5218 [45571]: https://github.com/rust-lang/rust/pull/45571
5219 [45580]: https://github.com/rust-lang/rust/pull/45580
5220 [45610]: https://github.com/rust-lang/rust/pull/45610
5221 [45660]: https://github.com/rust-lang/rust/pull/45660
5222 [45692]: https://github.com/rust-lang/rust/pull/45692
5223 [45711]: https://github.com/rust-lang/rust/pull/45711
5224 [45772]: https://github.com/rust-lang/rust/pull/45772
5225 [45852]: https://github.com/rust-lang/rust/issues/45852
5226 [45853]: https://github.com/rust-lang/rust/pull/45853
5227 [45887]: https://github.com/rust-lang/rust/pull/45887
5228 [45920]: https://github.com/rust-lang/rust/pull/45920
5229 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5230 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5231 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5234 Version 1.22.1 (2017-11-22)
5235 ==========================
5237 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5239 [46183]: https://github.com/rust-lang/rust/pull/46183
5241 Version 1.22.0 (2017-11-22)
5242 ==========================
5246 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5247 - [Now accepts underscores in unicode escapes][43716]
5248 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5249 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5253 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5254 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5255 This should decrease compile times for debug builds.
5256 - [strict memory alignment now enabled on ARMv6][45094]
5257 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5261 - [Allow atomic operations up to 32 bits
5262 on `armv5te_unknown_linux_gnueabi`][44978]
5263 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5264 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5265 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5266 - [Properly detect overflow in `Instant += Duration`.][44220]
5267 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5268 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5269 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5276 - [Cargo will now build multi file examples in subdirectories of the `examples`
5277 folder that have a `main.rs` file.][cargo/4496]
5278 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5279 the old format will continue to work and can be updated with `cargo update`.
5280 - [Now supports vendoring git repositories][cargo/3992]
5284 - [`libbacktrace` is now available on Apple platforms.][44251]
5285 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5286 This now lets you specify that a given code example will fail to compile.
5290 - [The minimum Android version that rustc can build for has been bumped
5291 to `4.0` from `2.3`][45656]
5292 - [Allowing `T op= &T` for numeric types has broken some type
5293 inference cases][45480]
5296 [42526]: https://github.com/rust-lang/rust/pull/42526
5297 [43017]: https://github.com/rust-lang/rust/pull/43017
5298 [43716]: https://github.com/rust-lang/rust/pull/43716
5299 [43949]: https://github.com/rust-lang/rust/pull/43949
5300 [44015]: https://github.com/rust-lang/rust/pull/44015
5301 [44220]: https://github.com/rust-lang/rust/pull/44220
5302 [44251]: https://github.com/rust-lang/rust/pull/44251
5303 [44287]: https://github.com/rust-lang/rust/pull/44287
5304 [44303]: https://github.com/rust-lang/rust/pull/44303
5305 [44456]: https://github.com/rust-lang/rust/pull/44456
5306 [44466]: https://github.com/rust-lang/rust/pull/44466
5307 [44895]: https://github.com/rust-lang/rust/pull/44895
5308 [44966]: https://github.com/rust-lang/rust/pull/44966
5309 [44978]: https://github.com/rust-lang/rust/pull/44978
5310 [45041]: https://github.com/rust-lang/rust/pull/45041
5311 [45064]: https://github.com/rust-lang/rust/pull/45064
5312 [45075]: https://github.com/rust-lang/rust/pull/45075
5313 [45094]: https://github.com/rust-lang/rust/pull/45094
5314 [45095]: https://github.com/rust-lang/rust/pull/45095
5315 [45480]: https://github.com/rust-lang/rust/issues/45480
5316 [45656]: https://github.com/rust-lang/rust/pull/45656
5317 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5318 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5319 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5326 Version 1.21.0 (2017-10-12)
5327 ==========================
5331 - [You can now use static references for literals.][43838]
5335 let x: &'static u32 = &0;
5338 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5341 my_macro!(Vec<i32>::new); // Always worked
5342 my_macro!(Vec::<i32>::new); // Now works
5347 - [Upgraded jemalloc to 4.5.0][43911]
5348 - [Enabled unwinding panics on Redox][43917]
5349 - [Now runs LLVM in parallel during translation phase.][43506]
5350 This should reduce peak memory usage.
5354 - [Generate builtin impls for `Clone` for all arrays and tuples that
5355 are `T: Clone`][43690]
5356 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5357 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5358 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5363 [`std::mem::discriminant`]
5367 - [You can now call `cargo install` with multiple package names][cargo/4216]
5368 - [Cargo commands inside a virtual workspace will now implicitly
5369 pass `--all`][cargo/4335]
5370 - [Added a `[patch]` section to `Cargo.toml` to handle
5371 prepublication dependencies][cargo/4123] [RFC 1969]
5372 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5373 like patterns][cargo/4270]
5374 - [Added the `--all-targets` option][cargo/4400]
5375 - [Using required dependencies as a feature is now deprecated and emits
5376 a warning][cargo/4364]
5381 - [Cargo docs are moving][43916]
5382 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5383 - [The rustdoc book is now available][43863]
5384 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5385 - [Added a preview of RLS has been made available through rustup][44204]
5386 Install with `rustup component add rls-preview`
5387 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5388 Previously only showed `std::os::unix`.
5392 - [Changes in method matching against higher-ranked types][43880] This may cause
5393 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5394 - [rustc's JSON error output's byte position start at top of file.][42973]
5395 Was previously relative to the rustc's internal `CodeMap` struct which
5396 required the unstable library `libsyntax` to correctly use.
5397 - [`unused_results` lint no longer ignores booleans][43728]
5399 [42565]: https://github.com/rust-lang/rust/pull/42565
5400 [42973]: https://github.com/rust-lang/rust/pull/42973
5401 [43348]: https://github.com/rust-lang/rust/pull/43348
5402 [43459]: https://github.com/rust-lang/rust/pull/43459
5403 [43506]: https://github.com/rust-lang/rust/pull/43506
5404 [43540]: https://github.com/rust-lang/rust/pull/43540
5405 [43690]: https://github.com/rust-lang/rust/pull/43690
5406 [43728]: https://github.com/rust-lang/rust/pull/43728
5407 [43838]: https://github.com/rust-lang/rust/pull/43838
5408 [43863]: https://github.com/rust-lang/rust/pull/43863
5409 [43880]: https://github.com/rust-lang/rust/pull/43880
5410 [43911]: https://github.com/rust-lang/rust/pull/43911
5411 [43916]: https://github.com/rust-lang/rust/pull/43916
5412 [43917]: https://github.com/rust-lang/rust/pull/43917
5413 [44204]: https://github.com/rust-lang/rust/pull/44204
5414 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5415 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5416 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5417 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5418 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5419 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5420 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5421 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5422 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5424 Version 1.20.0 (2017-08-31)
5425 ===========================
5429 - [Associated constants are now stabilised.][42809]
5430 - [A lot of macro bugs are now fixed.][42913]
5435 - [Struct fields are now properly coerced to the expected field type.][42807]
5436 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5437 `wasm32-experimental-emscripten` target.
5438 - [Changed some of the error messages to be more helpful.][42033]
5439 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5441 - [rustc now reports the total number of errors on compilation failure][43015]
5442 previously this was only the number of errors in the pass that failed.
5443 - [Expansion in rustc has been sped up 29x.][42533]
5444 - [added `msp430-none-elf` target.][43099]
5445 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5447 - [Fixes backtraces on Redox][43228]
5448 - [rustc now identifies different versions of same crate when absolute paths of
5449 different types match in an error message.][42826]
5455 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5456 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5458 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5459 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5460 - [Impl `Clone` for `DefaultHasher`.][42799]
5461 - [Impl `Sync` for `SyncSender`.][42397]
5462 - [Impl `FromStr` for `char`][42271]
5463 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5465 - [allow messages in the `unimplemented!()` macro.][42155]
5466 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5467 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5468 - [Upgrade to Unicode 10.0.0][42999]
5469 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5470 - [Skip the main thread's manual stack guard on Linux][43072]
5471 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5472 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5474 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5479 - [`CStr::into_c_string`]
5480 - [`CString::as_c_str`]
5481 - [`CString::into_boxed_c_str`]
5482 - [`Chain::get_mut`]
5483 - [`Chain::get_ref`]
5484 - [`Chain::into_inner`]
5485 - [`Option::get_or_insert_with`]
5486 - [`Option::get_or_insert`]
5487 - [`OsStr::into_os_string`]
5488 - [`OsString::into_boxed_os_str`]
5491 - [`Utf8Error::error_len`]
5492 - [`char::EscapeDebug`]
5493 - [`char::escape_debug`]
5494 - [`compile_error!`]
5495 - [`f32::from_bits`]
5497 - [`f64::from_bits`]
5499 - [`mem::ManuallyDrop`]
5500 - [`slice::sort_unstable_by_key`]
5501 - [`slice::sort_unstable_by`]
5502 - [`slice::sort_unstable`]
5503 - [`str::from_boxed_utf8_unchecked`]
5504 - [`str::as_bytes_mut`]
5505 - [`str::as_bytes_mut`]
5506 - [`str::from_utf8_mut`]
5507 - [`str::from_utf8_unchecked_mut`]
5509 - [`str::get_unchecked_mut`]
5510 - [`str::get_unchecked`]
5512 - [`str::into_boxed_bytes`]
5517 - [Cargo API token location moved from `~/.cargo/config` to
5518 `~/.cargo/credentials`.][cargo/3978]
5519 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5520 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5521 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5522 - [You can now specify version of a binary when installed through
5523 `cargo install` using `--vers`.][cargo/4229]
5524 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5525 failure.][cargo/4248]
5526 - [Changed the convention around which file is the crate root.][cargo/4259]
5527 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
5528 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
5533 - [Functions with `'static` in their return types will now not be as usable as
5534 if they were using lifetime parameters instead.][42417]
5535 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5536 takes the sign of NaN into account where previously didn't.][42430]
5538 [42033]: https://github.com/rust-lang/rust/pull/42033
5539 [42155]: https://github.com/rust-lang/rust/pull/42155
5540 [42271]: https://github.com/rust-lang/rust/pull/42271
5541 [42397]: https://github.com/rust-lang/rust/pull/42397
5542 [42417]: https://github.com/rust-lang/rust/pull/42417
5543 [42430]: https://github.com/rust-lang/rust/pull/42430
5544 [42431]: https://github.com/rust-lang/rust/pull/42431
5545 [42533]: https://github.com/rust-lang/rust/pull/42533
5546 [42571]: https://github.com/rust-lang/rust/pull/42571
5547 [42613]: https://github.com/rust-lang/rust/pull/42613
5548 [42799]: https://github.com/rust-lang/rust/pull/42799
5549 [42807]: https://github.com/rust-lang/rust/pull/42807
5550 [42809]: https://github.com/rust-lang/rust/pull/42809
5551 [42822]: https://github.com/rust-lang/rust/pull/42822
5552 [42826]: https://github.com/rust-lang/rust/pull/42826
5553 [42854]: https://github.com/rust-lang/rust/pull/42854
5554 [42913]: https://github.com/rust-lang/rust/pull/42913
5555 [42999]: https://github.com/rust-lang/rust/pull/42999
5556 [43011]: https://github.com/rust-lang/rust/pull/43011
5557 [43015]: https://github.com/rust-lang/rust/pull/43015
5558 [43072]: https://github.com/rust-lang/rust/pull/43072
5559 [43077]: https://github.com/rust-lang/rust/pull/43077
5560 [43097]: https://github.com/rust-lang/rust/pull/43097
5561 [43099]: https://github.com/rust-lang/rust/pull/43099
5562 [43170]: https://github.com/rust-lang/rust/pull/43170
5563 [43178]: https://github.com/rust-lang/rust/pull/43178
5564 [43185]: https://github.com/rust-lang/rust/pull/43185
5565 [43228]: https://github.com/rust-lang/rust/pull/43228
5566 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5567 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5568 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5569 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5570 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5571 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5572 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5573 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5574 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5575 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5576 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5577 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5578 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5579 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5580 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5581 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5582 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5583 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5584 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5585 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5586 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5587 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5588 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5589 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5590 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5591 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5592 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5593 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5594 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5595 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5596 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5597 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5598 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5599 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5600 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5601 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5602 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5603 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5604 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5607 Version 1.19.0 (2017-07-20)
5608 ===========================
5613 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5614 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5615 - [Macro recursion limit increased to 1024 from 64.][41676]
5616 - [Added lint for detecting unused macros.][41907]
5617 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5618 For example: `let x = loop { break 7; };`
5619 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5620 contain `Copy` types and cannot have a `Drop` implementation.
5621 Example: `union Foo { bar: u8, baz: usize }`
5622 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5623 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5628 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5629 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5630 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5631 you should use `--target armv7-linux-androideabi`.
5632 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5633 - [Minor optimisation of string operations.][42037]
5634 - [Compiler error message is now `aborting due to previous error(s)` instead of
5635 `aborting due to N previous errors`][42150] This was previously inaccurate and
5636 would only count certain kinds of errors.
5637 - [The compiler now supports Visual Studio 2017][42225]
5638 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5639 - [Added a lot][42264] of [new error codes][42302]
5640 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5641 libraries with C Run-time Libraries(CRT) to be statically linked.
5642 - [Fixed various ARM codegen bugs][42740]
5647 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5648 `Extend<Cow<'a, str>>`][41449]
5649 - [`Vec` now implements `From<&mut [T]>`][41530]
5650 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5651 - [`SplitWhitespace` now implements `Clone`][41659]
5652 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5654 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5655 macros, but for printing to stderr.
5660 - [`OsString::shrink_to_fit`]
5663 - [`thread::ThreadId`]
5668 - [Build scripts can now add environment variables to the environment
5669 the crate is being compiled in.
5670 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5671 - [Subcommands now replace the current process rather than spawning a new
5672 child process][cargo/3970]
5673 - [Workspace members can now accept glob file patterns][cargo/3979]
5674 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5675 the members in a given workspace.][cargo/3988]
5676 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5677 - [Target directory path is now in the cargo metadata][cargo/4022]
5678 - [Cargo no longer checks out a local working directory for the
5679 crates.io index][cargo/4026] This should provide smaller file size for the
5680 registry, and improve cloning times, especially on Windows machines.
5681 - [Added an `--exclude` option for excluding certain packages when using the
5682 `--all` option][cargo/4031]
5683 - [Cargo will now automatically retry when receiving a 5xx error
5684 from crates.io][cargo/4032]
5685 - [The `--features` option now accepts multiple comma or space
5686 delimited values.][cargo/4084]
5687 - [Added support for custom target specific runners][cargo/3954]
5692 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5694 - [Rust will now release XZ compressed packages][rust-installer/57]
5695 - [rustup will now prefer to download rust packages with
5696 XZ compression][rustup/1100] over GZip packages.
5697 - [Added the ability to escape `#` in rust documentation][41785] By adding
5698 additional `#`'s ie. `##` is now `#`
5703 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5704 - [`-Z` flags are now no longer allowed to be used on the stable
5705 compiler.][41751] This has been a warning for a year previous to this.
5706 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5707 longer works][42844]. Users should migrate to the built-in `check`
5708 command, which has been available since 1.16.
5709 - [Ending a float literal with `._` is now a hard error.
5710 Example: `42._` .][41946]
5711 - [Any use of a private `extern crate` outside of its module is now a
5712 hard error.][36886] This was previously a warning.
5713 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5714 relative while the `::` prefix makes a path absolute, but was ignored and the
5715 path was relative regardless.
5716 - [Floating point constants in match patterns is now a hard error][36890]
5717 This was previously a warning.
5718 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5719 match patterns is now a hard error][36891] This was previously a warning.
5720 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5722 - [From the pound escape, lines consisting of multiple `#`s are
5724 - [It is an error to re-export private enum variants][42460]. This is
5725 known to break a number of crates that depend on an older version of
5727 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5728 to use it to find the linker, and the build will fail where it did
5729 not previously][42607]
5731 [36886]: https://github.com/rust-lang/rust/issues/36886
5732 [36888]: https://github.com/rust-lang/rust/issues/36888
5733 [36890]: https://github.com/rust-lang/rust/issues/36890
5734 [36891]: https://github.com/rust-lang/rust/issues/36891
5735 [36892]: https://github.com/rust-lang/rust/issues/36892
5736 [37406]: https://github.com/rust-lang/rust/issues/37406
5737 [39983]: https://github.com/rust-lang/rust/pull/39983
5738 [41145]: https://github.com/rust-lang/rust/pull/41145
5739 [41192]: https://github.com/rust-lang/rust/pull/41192
5740 [41258]: https://github.com/rust-lang/rust/pull/41258
5741 [41370]: https://github.com/rust-lang/rust/pull/41370
5742 [41449]: https://github.com/rust-lang/rust/pull/41449
5743 [41530]: https://github.com/rust-lang/rust/pull/41530
5744 [41624]: https://github.com/rust-lang/rust/pull/41624
5745 [41656]: https://github.com/rust-lang/rust/pull/41656
5746 [41659]: https://github.com/rust-lang/rust/pull/41659
5747 [41676]: https://github.com/rust-lang/rust/pull/41676
5748 [41751]: https://github.com/rust-lang/rust/pull/41751
5749 [41764]: https://github.com/rust-lang/rust/pull/41764
5750 [41785]: https://github.com/rust-lang/rust/pull/41785
5751 [41873]: https://github.com/rust-lang/rust/pull/41873
5752 [41907]: https://github.com/rust-lang/rust/pull/41907
5753 [41946]: https://github.com/rust-lang/rust/pull/41946
5754 [42016]: https://github.com/rust-lang/rust/pull/42016
5755 [42037]: https://github.com/rust-lang/rust/pull/42037
5756 [42068]: https://github.com/rust-lang/rust/pull/42068
5757 [42150]: https://github.com/rust-lang/rust/pull/42150
5758 [42162]: https://github.com/rust-lang/rust/pull/42162
5759 [42225]: https://github.com/rust-lang/rust/pull/42225
5760 [42264]: https://github.com/rust-lang/rust/pull/42264
5761 [42302]: https://github.com/rust-lang/rust/pull/42302
5762 [42460]: https://github.com/rust-lang/rust/issues/42460
5763 [42607]: https://github.com/rust-lang/rust/issues/42607
5764 [42740]: https://github.com/rust-lang/rust/pull/42740
5765 [42844]: https://github.com/rust-lang/rust/issues/42844
5766 [42948]: https://github.com/rust-lang/rust/pull/42948
5767 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5768 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5769 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5770 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5771 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5772 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5773 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5774 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5775 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5776 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5777 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5778 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5779 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5780 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5781 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5782 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5783 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5784 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5785 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5786 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5787 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5788 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5791 Version 1.18.0 (2017-06-08)
5792 ===========================
5797 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5798 make the item visible to just that module tree. Also accepts the keyword
5799 `crate` to make something public to the whole crate but not users of the
5800 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5801 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5802 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5803 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5804 types like `Write + Send`, trailing `+` are now supported in trait objects,
5805 and better error reporting for trait objects starting with `?Sized`.
5806 - [0e+10 is now a valid floating point literal][40589]
5807 - [Now warns if you bind a lifetime parameter to 'static][40734]
5808 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5809 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5810 representation in some cases.][40377]
5815 - [rustc can now emit mir with `--emit mir`][39891]
5816 - [Improved LLVM IR for trivial functions][40367]
5817 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5818 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5819 opportunities found through profiling
5820 - [Improved backtrace formatting when panicking][38165]
5825 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5826 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5827 iteration or reallocation.
5828 - [Simplified HashMap Bucket interface][40561] provides performance
5829 improvements for iterating and cloning.
5830 - [Specialize Vec::from_elem to use calloc][40409]
5831 - [Fixed Race condition in fs::create_dir_all][39799]
5832 - [No longer caching stdio on Windows][40516]
5833 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5834 2.50%~ faster and in one case now 12.50% faster.
5835 - [Optimized `AtomicBool::fetch_nand`][41143]
5840 - [`Child::try_wait`]
5841 - [`HashMap::retain`]
5842 - [`HashSet::retain`]
5844 - [`TcpStream::peek`]
5845 - [`UdpSocket::peek`]
5846 - [`UdpSocket::peek_from`]
5851 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5852 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5853 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5854 - [Added Android build support][cargo/3885]
5855 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5856 of a certain type, for example `cargo build --bins` will build all
5858 - [Added support for haiku][cargo/3952]
5863 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5864 - [Added rust-windbg script for better debugging on Windows][39983]
5865 - [Rust now uses the official cross compiler for NetBSD][40612]
5866 - [rustdoc now accepts `#` at the start of files][40828]
5867 - [Fixed jemalloc support for musl][41168]
5872 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5873 always placed after the sign if it exists and before the digits. With the `#`
5874 flag the zeroes are placed after the prefix and before the digits.
5875 - [Due to the struct field optimisation][40377], using `transmute` on structs
5876 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5877 always been undefined behavior, but is now more likely to break in practice.
5878 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5879 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5880 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5881 - [Overlapping inherent `impl`s are now a hard error][40728]
5882 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5883 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5884 `out.asm` and `out.ll` instead of only one of the filetypes.
5885 - [ calling a function that returns `Self` will no longer work][41805] when
5886 the size of `Self` cannot be statically determined.
5887 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5888 this has caused a few regressions namely:
5890 - Changed the link order of local static/dynamic libraries (respecting the
5891 order on given rather than having the compiler reorder).
5892 - Changed how MinGW is linked, native code linked to dynamic libraries
5893 may require manually linking to the gcc support library (for the native
5896 [38165]: https://github.com/rust-lang/rust/pull/38165
5897 [39799]: https://github.com/rust-lang/rust/pull/39799
5898 [39891]: https://github.com/rust-lang/rust/pull/39891
5899 [39983]: https://github.com/rust-lang/rust/pull/39983
5900 [40043]: https://github.com/rust-lang/rust/pull/40043
5901 [40241]: https://github.com/rust-lang/rust/pull/40241
5902 [40338]: https://github.com/rust-lang/rust/pull/40338
5903 [40367]: https://github.com/rust-lang/rust/pull/40367
5904 [40377]: https://github.com/rust-lang/rust/pull/40377
5905 [40409]: https://github.com/rust-lang/rust/pull/40409
5906 [40516]: https://github.com/rust-lang/rust/pull/40516
5907 [40556]: https://github.com/rust-lang/rust/pull/40556
5908 [40561]: https://github.com/rust-lang/rust/pull/40561
5909 [40589]: https://github.com/rust-lang/rust/pull/40589
5910 [40612]: https://github.com/rust-lang/rust/pull/40612
5911 [40723]: https://github.com/rust-lang/rust/pull/40723
5912 [40728]: https://github.com/rust-lang/rust/pull/40728
5913 [40731]: https://github.com/rust-lang/rust/pull/40731
5914 [40734]: https://github.com/rust-lang/rust/pull/40734
5915 [40805]: https://github.com/rust-lang/rust/pull/40805
5916 [40807]: https://github.com/rust-lang/rust/pull/40807
5917 [40828]: https://github.com/rust-lang/rust/pull/40828
5918 [40870]: https://github.com/rust-lang/rust/pull/40870
5919 [41085]: https://github.com/rust-lang/rust/pull/41085
5920 [41143]: https://github.com/rust-lang/rust/pull/41143
5921 [41168]: https://github.com/rust-lang/rust/pull/41168
5922 [41270]: https://github.com/rust-lang/rust/issues/41270
5923 [41469]: https://github.com/rust-lang/rust/pull/41469
5924 [41805]: https://github.com/rust-lang/rust/issues/41805
5925 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5926 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5927 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5928 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5929 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5930 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5931 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5932 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5933 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5934 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5935 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5936 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5937 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5938 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5941 Version 1.17.0 (2017-04-27)
5942 ===========================
5947 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5948 * [Fields of structs may be initialized without duplicating the field/variable
5949 names][39761]. [RFC 1682]
5950 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5951 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5952 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5953 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5954 `'b`. Soundness fix.
5955 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5956 * [Static variables may contain references to other statics][40027]
5961 * [Exit quickly on only `--emit dep-info`][40336]
5962 * [Make `-C relocation-model` more correctly determine whether the linker
5963 creates a position-independent executable][40245]
5964 * [Add `-C overflow-checks` to directly control whether integer overflow
5966 * [The rustc type checker now checks items on demand instead of in a single
5967 in-order pass][40008]. This is mostly an internal refactoring in support of
5968 future work, including incremental type checking, but also resolves [RFC
5969 1647], allowing `Self` to appear in `impl` `where` clauses.
5970 * [Optimize vtable loads][39995]
5971 * [Turn off vectorization for Emscripten targets][39990]
5972 * [Provide suggestions for unknown macros imported with `use`][39953]
5973 * [Fix ICEs in path resolution][39939]
5974 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5975 * [Add clearer error message using `&str + &str`][39116]
5986 * [`Ordering::then`]
5987 * [`Ordering::then_with`]
5988 * [`BTreeMap::range`]
5989 * [`BTreeMap::range_mut`]
5990 * [`collections::Bound`]
5991 * [`process::abort`]
5992 * [`ptr::read_unaligned`]
5993 * [`ptr::write_unaligned`]
5994 * [`Result::expect_err`]
5997 * [`Cell::into_inner`]
6003 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6004 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6005 * [`String` implements `FromIterator<&char>`][40028]
6006 * `Box` [implements][40009] a number of new conversions:
6007 `From<Box<str>> for String`,
6008 `From<Box<[T]>> for Vec<T>`,
6009 `From<Box<CStr>> for CString`,
6010 `From<Box<OsStr>> for OsString`,
6011 `From<Box<Path>> for PathBuf`,
6012 `Into<Box<str>> for String`,
6013 `Into<Box<[T]>> for Vec<T>`,
6014 `Into<Box<CStr>> for CString`,
6015 `Into<Box<OsStr>> for OsString`,
6016 `Into<Box<Path>> for PathBuf`,
6017 `Default for Box<str>`,
6018 `Default for Box<CStr>`,
6019 `Default for Box<OsStr>`,
6020 `From<&CStr> for Box<CStr>`,
6021 `From<&OsStr> for Box<OsStr>`,
6022 `From<&Path> for Box<Path>`
6023 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6024 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6025 * [Slightly optimize `slice::sort`][39538]
6026 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6027 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6028 `Box<str>` implements `From<&str>`][39438]
6029 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6030 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6031 * [`format!` estimates the needed capacity before writing a string][39356]
6032 * [Support unprivileged symlink creation in Windows][38921]
6033 * [`PathBuf` implements `Default`][38764]
6034 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6035 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6036 and poor hash functions.
6041 * [Add `cargo check --all`][cargo/3731]
6042 * [Add an option to ignore SSL revocation checking][cargo/3699]
6043 * [Add `cargo run --package`][cargo/3691]
6044 * [Add `required_features`][cargo/3667]
6045 * [Assume `build.rs` is a build script][cargo/3664]
6046 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6051 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6053 * [The "Unstable Book" documents nightly-only features][ubook]
6054 * [Improve the style of the sidebar in rustdoc output][40265]
6055 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6056 * [Fix MSP430 breakage due to `i128`][40257]
6057 * [Preliminary Solaris/SPARCv9 support][39903]
6058 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6059 run without installing the MSVC runtime.
6060 * [`rustdoc --test` includes file names in test names][39788]
6061 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6062 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6063 * [Initial support for `aarch64-unknown-freebsd`][39491]
6064 * [Initial support for `i686-unknown-netbsd`][39426]
6065 * [This release no longer includes the old makefile build system][39431]. Rust
6066 is built with a custom build system, written in Rust, and with Cargo.
6067 * [Add Debug implementations for libcollection structs][39002]
6068 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6069 * [`--test-threads=0` produces an error][38945]
6070 * [`rustup` installs documentation by default][40526]
6071 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6072 WinDbg and Visual Studio to improve the debugging experience.
6077 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6078 workaround, either use MSVC 2015 or run vcvars.bat.
6079 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6080 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6081 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6083 * [`format!` and `Display::to_string` panic if an underlying formatting
6084 implementation returns an error][40117]. Previously the error was silently
6085 ignored. It is incorrect for `write_fmt` to return an error when writing
6087 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6088 crates were marked stable and could be accessed from the stable toolchain.
6089 * [Rust git source no longer includes vendored crates][39728]. Those that need
6090 to build with vendored crates should build from release tarballs.
6091 * [Fix inert attributes from `proc_macro_derives`][39572]
6092 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6093 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6095 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6096 existing code generally ignores the type of dead-code unless a type-hint is
6097 provided; this can cause surprising inference interactions particularly around
6098 defaulting. The new code uniformly ignores the result type of dead-code.
6099 * [Tuple-struct constructors with private fields are no longer visible][38932]
6100 * [Lifetime parameters that do not appear in the arguments are now considered
6101 early-bound][38897], resolving a soundness bug (#[32330]). The
6102 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6104 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6105 * [Make transmuting from fn item types to pointer-sized types a hard
6108 [27787]: https://github.com/rust-lang/rust/issues/27787
6109 [32330]: https://github.com/rust-lang/rust/issues/32330
6110 [34198]: https://github.com/rust-lang/rust/pull/34198
6111 [38161]: https://github.com/rust-lang/rust/pull/38161
6112 [38368]: https://github.com/rust-lang/rust/pull/38368
6113 [38584]: https://github.com/rust-lang/rust/issues/38584
6114 [38661]: https://github.com/rust-lang/rust/pull/38661
6115 [38764]: https://github.com/rust-lang/rust/pull/38764
6116 [38864]: https://github.com/rust-lang/rust/issues/38864
6117 [38897]: https://github.com/rust-lang/rust/pull/38897
6118 [38921]: https://github.com/rust-lang/rust/pull/38921
6119 [38932]: https://github.com/rust-lang/rust/pull/38932
6120 [38945]: https://github.com/rust-lang/rust/pull/38945
6121 [38981]: https://github.com/rust-lang/rust/pull/38981
6122 [39002]: https://github.com/rust-lang/rust/pull/39002
6123 [39116]: https://github.com/rust-lang/rust/pull/39116
6124 [39193]: https://github.com/rust-lang/rust/pull/39193
6125 [39265]: https://github.com/rust-lang/rust/pull/39265
6126 [39356]: https://github.com/rust-lang/rust/pull/39356
6127 [39372]: https://github.com/rust-lang/rust/pull/39372
6128 [39426]: https://github.com/rust-lang/rust/pull/39426
6129 [39431]: https://github.com/rust-lang/rust/pull/39431
6130 [39438]: https://github.com/rust-lang/rust/pull/39438
6131 [39440]: https://github.com/rust-lang/rust/pull/39440
6132 [39485]: https://github.com/rust-lang/rust/pull/39485
6133 [39491]: https://github.com/rust-lang/rust/pull/39491
6134 [39518]: https://github.com/rust-lang/rust/pull/39518
6135 [39538]: https://github.com/rust-lang/rust/pull/39538
6136 [39572]: https://github.com/rust-lang/rust/pull/39572
6137 [39633]: https://github.com/rust-lang/rust/pull/39633
6138 [39642]: https://github.com/rust-lang/rust/pull/39642
6139 [39728]: https://github.com/rust-lang/rust/pull/39728
6140 [39761]: https://github.com/rust-lang/rust/pull/39761
6141 [39788]: https://github.com/rust-lang/rust/pull/39788
6142 [39793]: https://github.com/rust-lang/rust/pull/39793
6143 [39837]: https://github.com/rust-lang/rust/pull/39837
6144 [39843]: https://github.com/rust-lang/rust/pull/39843
6145 [39851]: https://github.com/rust-lang/rust/pull/39851
6146 [39903]: https://github.com/rust-lang/rust/pull/39903
6147 [39939]: https://github.com/rust-lang/rust/pull/39939
6148 [39953]: https://github.com/rust-lang/rust/pull/39953
6149 [39960]: https://github.com/rust-lang/rust/pull/39960
6150 [39990]: https://github.com/rust-lang/rust/pull/39990
6151 [39995]: https://github.com/rust-lang/rust/pull/39995
6152 [40008]: https://github.com/rust-lang/rust/pull/40008
6153 [40009]: https://github.com/rust-lang/rust/pull/40009
6154 [40027]: https://github.com/rust-lang/rust/pull/40027
6155 [40028]: https://github.com/rust-lang/rust/pull/40028
6156 [40037]: https://github.com/rust-lang/rust/pull/40037
6157 [40117]: https://github.com/rust-lang/rust/pull/40117
6158 [40166]: https://github.com/rust-lang/rust/pull/40166
6159 [40245]: https://github.com/rust-lang/rust/pull/40245
6160 [40257]: https://github.com/rust-lang/rust/pull/40257
6161 [40261]: https://github.com/rust-lang/rust/pull/40261
6162 [40265]: https://github.com/rust-lang/rust/pull/40265
6163 [40319]: https://github.com/rust-lang/rust/pull/40319
6164 [40336]: https://github.com/rust-lang/rust/pull/40336
6165 [40526]: https://github.com/rust-lang/rust/pull/40526
6166 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6167 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6168 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6169 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6170 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6171 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6172 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6173 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6174 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6175 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6176 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6177 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6178 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6179 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6180 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6181 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6182 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6183 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6184 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6185 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6186 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6187 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6188 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6189 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6190 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6191 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6192 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6193 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6194 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6195 [mdbook]: https://crates.io/crates/mdbook
6196 [ubook]: https://doc.rust-lang.org/unstable-book/
6199 Version 1.16.0 (2017-03-16)
6200 ===========================
6205 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6206 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6207 match patterns][38069]
6208 * [Clean up semantics of `self` in an import list][38313]
6209 * [`Self` may appear in `impl` headers][38920]
6210 * [`Self` may appear in struct expressions][39282]
6215 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6216 a `.rmeta` file containing only crate metadata][38571]. This can be
6217 used by tools like the Rust Language Service to perform
6218 metadata-only builds.
6219 * [Levenshtein based typo suggestions now work in most places, while
6220 previously they worked only for fields and sometimes for local
6221 variables][38927]. Together with the overhaul of "no
6222 resolution"/"unexpected resolution" errors (#[38154]) they result in
6223 large and systematic improvement in resolution diagnostics.
6224 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6226 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6227 * [`rustc` no longer attempts to provide "consider using an explicit
6228 lifetime" suggestions][37057]. They were inaccurate.
6233 * [`VecDeque::truncate`]
6234 * [`VecDeque::resize`]
6235 * [`String::insert_str`]
6236 * [`Duration::checked_add`]
6237 * [`Duration::checked_sub`]
6238 * [`Duration::checked_div`]
6239 * [`Duration::checked_mul`]
6242 * [`SocketAddr::is_ipv4`]
6243 * [`SocketAddr::is_ipv6`]
6244 * [`IpAddr::is_ipv4`]
6245 * [`IpAddr::is_ipv6`]
6247 * [`Vec::dedup_by_key`]
6248 * [`Result::unwrap_or_default`]
6249 * [`<*const T>::wrapping_offset`]
6250 * [`<*mut T>::wrapping_offset`]
6251 * `CommandExt::creation_flags`
6252 * [`File::set_permissions`]
6253 * [`String::split_off`]
6258 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6259 their argument by `Borrow` parameter][37761]
6260 * [All public types in std implement `Debug`][38006]
6261 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6262 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6263 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6265 * [std: Fix partial writes in `LineWriter`][38062]
6266 * [std: Clamp max read/write sizes on Unix][38062]
6267 * [Use more specific panic message for `&str` slicing errors][38066]
6268 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6269 functionality cannot be achieved in std currently.
6270 * [`writeln!`, like `println!`, now accepts a form with no string
6271 or formatting arguments, to just print a newline][38469]
6272 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6273 * [Reduce the size of static data in `std_unicode::tables`][38781]
6274 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6275 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6277 * [`Duration` implements `Sum`][38712]
6278 * [`String` implements `ToSocketAddrs`][39048]
6283 * [The `cargo check` command does a type check of a project without
6284 building it][cargo/3296]
6285 * [crates.io will display CI badges from Travis and AppVeyor, if
6286 specified in Cargo.toml][cargo/3546]
6287 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6288 * [Compilation profiles accept integer values for `debug`, in addition
6289 to `true` and `false`. These are passed to `rustc` as the value to
6290 `-C debuginfo`][cargo/3534]
6291 * [Implement `cargo --version --verbose`][cargo/3604]
6292 * [All builds now output 'dep-info' build dependencies compatible with
6293 make and ninja][cargo/3557]
6294 * [Build all workspace members with `build --all`][cargo/3511]
6295 * [Document all workspace members with `doc --all`][cargo/3515]
6296 * [Path deps outside workspace are not members][cargo/3443]
6301 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6302 the path to the Rust implementation][38589]
6303 * [The `armv7-linux-androideabi` target no longer enables NEON
6304 extensions, per Google's ABI guide][38413]
6305 * [The stock standard library can be compiled for Redox OS][38401]
6306 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6308 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6310 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6315 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6316 match patterns][38069]
6317 * In this release, references to uninhabited types can not be
6318 pattern-matched. This was accidentally allowed in 1.15.
6319 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6320 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6322 * [Clean up semantics of `self` in an import list][38313]
6323 * Reimplemented lifetime elision. This change was almost entirely compatible
6324 with existing code, but it did close a number of small bugs and loopholes,
6325 as well as being more accepting in some other [cases][41105].
6327 [37057]: https://github.com/rust-lang/rust/pull/37057
6328 [37761]: https://github.com/rust-lang/rust/pull/37761
6329 [38006]: https://github.com/rust-lang/rust/pull/38006
6330 [38051]: https://github.com/rust-lang/rust/pull/38051
6331 [38062]: https://github.com/rust-lang/rust/pull/38062
6332 [38062]: https://github.com/rust-lang/rust/pull/38622
6333 [38066]: https://github.com/rust-lang/rust/pull/38066
6334 [38069]: https://github.com/rust-lang/rust/pull/38069
6335 [38131]: https://github.com/rust-lang/rust/pull/38131
6336 [38154]: https://github.com/rust-lang/rust/pull/38154
6337 [38274]: https://github.com/rust-lang/rust/pull/38274
6338 [38304]: https://github.com/rust-lang/rust/pull/38304
6339 [38313]: https://github.com/rust-lang/rust/pull/38313
6340 [38314]: https://github.com/rust-lang/rust/pull/38314
6341 [38327]: https://github.com/rust-lang/rust/pull/38327
6342 [38401]: https://github.com/rust-lang/rust/pull/38401
6343 [38413]: https://github.com/rust-lang/rust/pull/38413
6344 [38469]: https://github.com/rust-lang/rust/pull/38469
6345 [38559]: https://github.com/rust-lang/rust/pull/38559
6346 [38571]: https://github.com/rust-lang/rust/pull/38571
6347 [38580]: https://github.com/rust-lang/rust/pull/38580
6348 [38589]: https://github.com/rust-lang/rust/pull/38589
6349 [38670]: https://github.com/rust-lang/rust/pull/38670
6350 [38712]: https://github.com/rust-lang/rust/pull/38712
6351 [38726]: https://github.com/rust-lang/rust/pull/38726
6352 [38781]: https://github.com/rust-lang/rust/pull/38781
6353 [38798]: https://github.com/rust-lang/rust/pull/38798
6354 [38909]: https://github.com/rust-lang/rust/pull/38909
6355 [38920]: https://github.com/rust-lang/rust/pull/38920
6356 [38927]: https://github.com/rust-lang/rust/pull/38927
6357 [39048]: https://github.com/rust-lang/rust/pull/39048
6358 [39282]: https://github.com/rust-lang/rust/pull/39282
6359 [39379]: https://github.com/rust-lang/rust/pull/39379
6360 [41105]: https://github.com/rust-lang/rust/issues/41105
6361 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6362 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6363 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6364 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6365 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6366 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6367 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6368 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6369 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6370 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6371 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6372 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6373 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6374 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6375 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6376 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6377 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6378 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6379 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6380 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6381 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6382 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6383 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6384 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6385 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6386 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6387 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6388 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6389 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6390 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6393 Version 1.15.1 (2017-02-09)
6394 ===========================
6396 * [Fix IntoIter::as_mut_slice's signature][39466]
6397 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6399 [39466]: https://github.com/rust-lang/rust/pull/39466
6400 [39523]: https://github.com/rust-lang/rust/pull/39523
6403 Version 1.15.0 (2017-02-02)
6404 ===========================
6409 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6410 stable. This allows popular code-generating crates like Serde and Diesel to
6411 work ergonomically. [RFC 1681].
6412 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6413 with curly braces][36868]. Part of [RFC 1506].
6414 * [A number of minor changes to name resolution have been activated][37127].
6415 They add up to more consistent semantics, allowing for future evolution of
6416 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6417 details of what is different. The breaking changes here have been transitioned
6418 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6419 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6421 * [`?Sized` can be used in `where` clauses][37791]
6422 * [There is now a limit on the size of monomorphized types and it can be
6423 modified with the `#![type_size_limit]` crate attribute, similarly to
6424 the `#![recursion_limit]` attribute][37789]
6429 * [On Windows, the compiler will apply dllimport attributes when linking to
6430 extern functions][37973]. Additional attributes and flags can control which
6431 library kind is linked and its name. [RFC 1717].
6432 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6433 * [The `--test` flag works with procedural macro crates][38107]
6434 * [Fix `extern "aapcs" fn` ABI][37814]
6435 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6436 * [The `format!` expander recognizes incorrect `printf` and shell-style
6437 formatting directives and suggests the correct format][37613].
6438 * [Only report one error for all unused imports in an import list][37456]
6440 Compiler Performance
6441 --------------------
6443 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6444 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6445 * [Don't clone in `UnificationTable::probe`][37848]
6446 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6447 * [Use small vectors in type walker][37760]
6448 * [Macro expansion performance was improved][37701]
6449 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6450 * [Replace FNV with a faster hash function][37229]
6455 * [`std::iter::Iterator::min_by`]
6456 * [`std::iter::Iterator::max_by`]
6457 * [`std::os::*::fs::FileExt`]
6458 * [`std::sync::atomic::Atomic*::get_mut`]
6459 * [`std::sync::atomic::Atomic*::into_inner`]
6460 * [`std::vec::IntoIter::as_slice`]
6461 * [`std::vec::IntoIter::as_mut_slice`]
6462 * [`std::sync::mpsc::Receiver::try_iter`]
6463 * [`std::os::unix::process::CommandExt::before_exec`]
6464 * [`std::rc::Rc::strong_count`]
6465 * [`std::rc::Rc::weak_count`]
6466 * [`std::sync::Arc::strong_count`]
6467 * [`std::sync::Arc::weak_count`]
6468 * [`std::char::encode_utf8`]
6469 * [`std::char::encode_utf16`]
6470 * [`std::cell::Ref::clone`]
6471 * [`std::io::Take::into_inner`]
6476 * [The standard sorting algorithm has been rewritten for dramatic performance
6477 improvements][38192]. It is a hybrid merge sort, drawing influences from
6478 Timsort. Previously it was a naive merge sort.
6479 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6480 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6482 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6483 and `char_indices().last()`][37882]
6484 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6485 * [Chinese characters display correctly in `fmt::Debug`][37855]
6486 * [Derive `Default` for `Duration`][37699]
6487 * [Support creation of anonymous pipes on WinXP/2k][37677]
6488 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6489 * [Don't pass overlapped handles to processes][38835]
6494 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6495 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6496 should instead check the variable at runtime with `std::env`. That the value
6497 was set at build time was a bug, and incorrect when cross-compiling. This
6498 change is known to cause breakage.
6499 * [Add `--all` flag to `cargo test`][cargo/3221]
6500 * [Compile statically against the MSVC CRT][cargo/3363]
6501 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6502 * [Link OpenSSL statically on OSX][cargo/3311]
6503 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6504 * [Test for bad path overrides with summaries][cargo/3336]
6505 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6506 * [Fix retrying crate downloads for network errors][cargo/3348]
6507 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6508 * [Emit more info on --message-format=json][cargo/3319]
6509 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6510 * [Don't ignore errors in workspace manifest][cargo/3409]
6511 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6516 * [Test runners (binaries built with `--test`) now support a `--list` argument
6517 that lists the tests it contains][38185]
6518 * [Test runners now support a `--exact` argument that makes the test filter
6519 match exactly, instead of matching only a substring of the test name][38181]
6520 * [rustdoc supports a `--playground-url` flag][37763]
6521 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6526 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6527 continue to be used in this release by passing `--disable-rustbuild` to the
6528 configure script, but they will be deleted soon. Note that the new build
6529 system uses a different on-disk layout that will likely affect any scripts
6531 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6533 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6534 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6540 * [A number of minor changes to name resolution have been activated][37127].
6541 They add up to more consistent semantics, allowing for future evolution of
6542 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6543 details of what is different. The breaking changes here have been transitioned
6544 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6545 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6546 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6547 should instead check the variable at runtime with `std::env`. That the value
6548 was set at build time was a bug, and incorrect when cross-compiling. This
6549 change is known to cause breakage.
6550 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6551 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6552 1.10 and is now an error by default. It will become a hard error in the near
6554 * [The semantics relating modules to file system directories are changing in
6555 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6556 lint, which is a warning in this release, and will become a hard error in the
6558 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6559 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6560 the underlying iterator][37834]
6562 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6563 [33685]: https://github.com/rust-lang/rust/issues/33685
6564 [36868]: https://github.com/rust-lang/rust/pull/36868
6565 [37127]: https://github.com/rust-lang/rust/pull/37127
6566 [37229]: https://github.com/rust-lang/rust/pull/37229
6567 [37456]: https://github.com/rust-lang/rust/pull/37456
6568 [37527]: https://github.com/rust-lang/rust/pull/37527
6569 [37602]: https://github.com/rust-lang/rust/pull/37602
6570 [37613]: https://github.com/rust-lang/rust/pull/37613
6571 [37615]: https://github.com/rust-lang/rust/pull/37615
6572 [37636]: https://github.com/rust-lang/rust/pull/37636
6573 [37627]: https://github.com/rust-lang/rust/pull/37627
6574 [37642]: https://github.com/rust-lang/rust/pull/37642
6575 [37677]: https://github.com/rust-lang/rust/pull/37677
6576 [37699]: https://github.com/rust-lang/rust/pull/37699
6577 [37701]: https://github.com/rust-lang/rust/pull/37701
6578 [37705]: https://github.com/rust-lang/rust/pull/37705
6579 [37749]: https://github.com/rust-lang/rust/pull/37749
6580 [37760]: https://github.com/rust-lang/rust/pull/37760
6581 [37763]: https://github.com/rust-lang/rust/pull/37763
6582 [37764]: https://github.com/rust-lang/rust/pull/37764
6583 [37789]: https://github.com/rust-lang/rust/pull/37789
6584 [37791]: https://github.com/rust-lang/rust/pull/37791
6585 [37814]: https://github.com/rust-lang/rust/pull/37814
6586 [37817]: https://github.com/rust-lang/rust/pull/37817
6587 [37834]: https://github.com/rust-lang/rust/pull/37834
6588 [37848]: https://github.com/rust-lang/rust/pull/37848
6589 [37855]: https://github.com/rust-lang/rust/pull/37855
6590 [37882]: https://github.com/rust-lang/rust/pull/37882
6591 [37888]: https://github.com/rust-lang/rust/pull/37888
6592 [37973]: https://github.com/rust-lang/rust/pull/37973
6593 [37979]: https://github.com/rust-lang/rust/pull/37979
6594 [38086]: https://github.com/rust-lang/rust/pull/38086
6595 [38107]: https://github.com/rust-lang/rust/pull/38107
6596 [38117]: https://github.com/rust-lang/rust/pull/38117
6597 [38134]: https://github.com/rust-lang/rust/pull/38134
6598 [38146]: https://github.com/rust-lang/rust/pull/38146
6599 [38181]: https://github.com/rust-lang/rust/pull/38181
6600 [38182]: https://github.com/rust-lang/rust/pull/38182
6601 [38185]: https://github.com/rust-lang/rust/pull/38185
6602 [38192]: https://github.com/rust-lang/rust/pull/38192
6603 [38279]: https://github.com/rust-lang/rust/pull/38279
6604 [38835]: https://github.com/rust-lang/rust/pull/38835
6605 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6606 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6607 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6608 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6609 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6610 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6611 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6612 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6613 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6614 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6615 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6616 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6617 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6618 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6619 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6620 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6621 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6622 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6623 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6624 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6625 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6626 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6627 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6628 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6629 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6630 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6631 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6632 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6633 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6634 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6635 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6636 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6637 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6638 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6639 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6640 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6641 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6642 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6645 Version 1.14.0 (2016-12-22)
6646 ===========================
6651 * [`..` matches multiple tuple fields in enum variants, structs
6652 and tuples][36843]. [RFC 1492].
6653 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6654 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6655 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6656 dereferencing][36822]
6661 * [Mark enums with non-zero discriminant as non-zero][37224]
6662 * [Lower-case `static mut` names are linted like other
6663 statics and consts][37162]
6664 * [Fix ICE on some macros in const integer positions
6665 (e.g. `[u8; m!()]`)][36819]
6666 * [Improve error message and snippet for "did you mean `x`"][36798]
6667 * [Add a panic-strategy field to the target specification][36794]
6668 * [Include LLVM version in `--version --verbose`][37200]
6670 Compile-time Optimizations
6671 --------------------------
6673 * [Improve macro expansion performance][37569]
6674 * [Shrink `Expr_::ExprInlineAsm`][37445]
6675 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6676 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6677 * [Avoid more allocations when compiling html5ever][37373]
6678 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6679 * [Avoid some allocations in the macro parser][37318]
6680 * [Use a faster deflate setting][37298]
6681 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6682 during interning of slices][37270]
6683 * [Optimize `write_metadata`][37267]
6684 * [Don't process obligation forest cycles when stalled][37231]
6685 * [Avoid many `CrateConfig` clones][37161]
6686 * [Optimize `Substs::super_fold_with`][37108]
6687 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6688 * [Speed up `plug_leaks`][36917]
6693 * [`println!()`, with no arguments, prints newline][36825].
6694 Previously, an empty string was required to achieve the same.
6695 * [`Wrapping` impls standard binary and unary operators, as well as
6696 the `Sum` and `Product` iterators][37356]
6697 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6699 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6700 `VecDeque` iterators][37315]
6701 * [Improve `SipHasher` performance on small values][37312]
6702 * [Add Iterator trait TrustedLen to enable better FromIterator /
6704 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6705 * [`ReadDir` implements `Debug`][37221]
6706 * [Implement `RefUnwindSafe` for atomic types][37178]
6707 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6708 * [Avoid allocations in `Decoder::read_str`][37064]
6709 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6710 * [Impl `Debug` for raw pointers to unsized data][36880]
6711 * [Don't reuse `HashMap` random seeds][37470]
6712 * [The internal memory layout of `HashMap` is more cache-friendly, for
6713 significant improvements in some operations][36692]
6714 * [`HashMap` uses less memory on 32-bit architectures][36595]
6715 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6720 * [Expose rustc cfg values to build scripts][cargo/3243]
6721 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6722 * [Fix passing --features when testing multiple packages][cargo/3280]
6723 * [Use a single profile set per workspace][cargo/3249]
6724 * [Load `replace` sections from lock files][cargo/3220]
6725 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6730 * [rustup is the recommended Rust installation method][1.14rustup]
6731 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6732 S390x. These are [tier 2] platforms and may have major defects. Follow the
6733 instructions on the website to install, or add the targets to an existing
6734 installation with `rustup target add`. The new target triples are:
6735 - `mips-unknown-linux-gnu`
6736 - `mipsel-unknown-linux-gnu`
6737 - `mips64-unknown-linux-gnuabi64`
6738 - `mips64el-unknown-linux-gnuabi64 `
6739 - `powerpc-unknown-linux-gnu`
6740 - `powerpc64-unknown-linux-gnu`
6741 - `powerpc64le-unknown-linux-gnu`
6742 - `s390x-unknown-linux-gnu `
6743 * This release includes target (std) builds for ARM Linux running MUSL
6744 libc. These are [tier 2] platforms and may have major defects. Add the
6745 following triples to an existing rustup installation with `rustup target add`:
6746 - `arm-unknown-linux-musleabi`
6747 - `arm-unknown-linux-musleabihf`
6748 - `armv7-unknown-linux-musleabihf`
6749 * This release includes [experimental support for WebAssembly][1.14wasm], via
6750 the `wasm32-unknown-emscripten` target. This target is known to have major
6751 defects. Please test, report, and fix.
6752 * rustup no longer installs documentation by default. Run `rustup
6753 component add rust-docs` to install.
6754 * [Fix line stepping in debugger][37310]
6755 * [Enable line number debuginfo in releases][37280]
6760 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6761 * [Add support for Fuchsia OS][37313]
6762 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6767 * [A number of forward-compatibility lints used by the compiler
6768 to gradually introduce language changes have been converted
6769 to deny by default][36894]:
6770 - ["use of inaccessible extern crate erroneously allowed"][36886]
6771 - ["type parameter default erroneously allowed in invalid location"][36887]
6772 - ["detects super or self keywords at the beginning of global path"][36888]
6773 - ["two overlapping inherent impls define an item with the same name
6774 were erroneously allowed"][36889]
6775 - ["floating-point constants cannot be used in patterns"][36890]
6776 - ["constants of struct or enum type can only be used in a pattern if
6777 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6778 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6779 * [Prohibit patterns in trait methods without bodies][37378]
6780 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6781 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6782 * [The `$crate` macro variable is accepted in fewer locations][37213]
6783 * [Impls specifying extra region requirements beyond the trait
6784 they implement are rejected][37167]
6785 * [Enums may not be unsized][37111]. Unsized enums are intended to
6786 work but never have. For now they are forbidden.
6787 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6789 [tier 2]: https://forge.rust-lang.org/platform-support.html
6790 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6791 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6792 [36430]: https://github.com/rust-lang/rust/pull/36430
6793 [36595]: https://github.com/rust-lang/rust/pull/36595
6794 [36595]: https://github.com/rust-lang/rust/pull/36595
6795 [36692]: https://github.com/rust-lang/rust/pull/36692
6796 [36767]: https://github.com/rust-lang/rust/pull/36767
6797 [36794]: https://github.com/rust-lang/rust/pull/36794
6798 [36798]: https://github.com/rust-lang/rust/pull/36798
6799 [36819]: https://github.com/rust-lang/rust/pull/36819
6800 [36822]: https://github.com/rust-lang/rust/pull/36822
6801 [36825]: https://github.com/rust-lang/rust/pull/36825
6802 [36843]: https://github.com/rust-lang/rust/pull/36843
6803 [36880]: https://github.com/rust-lang/rust/pull/36880
6804 [36886]: https://github.com/rust-lang/rust/issues/36886
6805 [36887]: https://github.com/rust-lang/rust/issues/36887
6806 [36888]: https://github.com/rust-lang/rust/issues/36888
6807 [36889]: https://github.com/rust-lang/rust/issues/36889
6808 [36890]: https://github.com/rust-lang/rust/issues/36890
6809 [36891]: https://github.com/rust-lang/rust/issues/36891
6810 [36892]: https://github.com/rust-lang/rust/issues/36892
6811 [36894]: https://github.com/rust-lang/rust/pull/36894
6812 [36917]: https://github.com/rust-lang/rust/pull/36917
6813 [36993]: https://github.com/rust-lang/rust/pull/36993
6814 [37037]: https://github.com/rust-lang/rust/pull/37037
6815 [37064]: https://github.com/rust-lang/rust/pull/37064
6816 [37094]: https://github.com/rust-lang/rust/pull/37094
6817 [37108]: https://github.com/rust-lang/rust/pull/37108
6818 [37111]: https://github.com/rust-lang/rust/pull/37111
6819 [37161]: https://github.com/rust-lang/rust/pull/37161
6820 [37162]: https://github.com/rust-lang/rust/pull/37162
6821 [37167]: https://github.com/rust-lang/rust/pull/37167
6822 [37178]: https://github.com/rust-lang/rust/pull/37178
6823 [37200]: https://github.com/rust-lang/rust/pull/37200
6824 [37213]: https://github.com/rust-lang/rust/pull/37213
6825 [37221]: https://github.com/rust-lang/rust/pull/37221
6826 [37224]: https://github.com/rust-lang/rust/pull/37224
6827 [37230]: https://github.com/rust-lang/rust/pull/37230
6828 [37231]: https://github.com/rust-lang/rust/pull/37231
6829 [37247]: https://github.com/rust-lang/rust/pull/37247
6830 [37267]: https://github.com/rust-lang/rust/pull/37267
6831 [37270]: https://github.com/rust-lang/rust/pull/37270
6832 [37273]: https://github.com/rust-lang/rust/pull/37273
6833 [37280]: https://github.com/rust-lang/rust/pull/37280
6834 [37298]: https://github.com/rust-lang/rust/pull/37298
6835 [37306]: https://github.com/rust-lang/rust/pull/37306
6836 [37310]: https://github.com/rust-lang/rust/pull/37310
6837 [37312]: https://github.com/rust-lang/rust/pull/37312
6838 [37313]: https://github.com/rust-lang/rust/pull/37313
6839 [37315]: https://github.com/rust-lang/rust/pull/37315
6840 [37318]: https://github.com/rust-lang/rust/pull/37318
6841 [37322]: https://github.com/rust-lang/rust/pull/37322
6842 [37326]: https://github.com/rust-lang/rust/pull/37326
6843 [37351]: https://github.com/rust-lang/rust/pull/37351
6844 [37356]: https://github.com/rust-lang/rust/pull/37356
6845 [37367]: https://github.com/rust-lang/rust/pull/37367
6846 [37373]: https://github.com/rust-lang/rust/pull/37373
6847 [37378]: https://github.com/rust-lang/rust/pull/37378
6848 [37389]: https://github.com/rust-lang/rust/pull/37389
6849 [37392]: https://github.com/rust-lang/rust/pull/37392
6850 [37427]: https://github.com/rust-lang/rust/pull/37427
6851 [37439]: https://github.com/rust-lang/rust/pull/37439
6852 [37445]: https://github.com/rust-lang/rust/pull/37445
6853 [37470]: https://github.com/rust-lang/rust/pull/37470
6854 [37569]: https://github.com/rust-lang/rust/pull/37569
6855 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6856 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6857 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6858 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6859 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6860 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6861 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6864 Version 1.13.0 (2016-11-10)
6865 ===========================
6870 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6871 errors, like the `try!` macro, described in [RFC 0243].
6872 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6873 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6874 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6875 * [Fix lifetime rules for 'if' conditions][36029]
6876 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6881 * [Add the `-C link-arg` argument][36574]
6882 * [Remove the old AST-based backend from rustc_trans][35764]
6883 * [Don't enable NEON by default on armv7 Linux][35814]
6884 * [Fix debug line number info for macro expansions][35238]
6885 * [Do not emit "class method" debuginfo for types that are not
6886 DICompositeType][36008]
6887 * [Warn about multiple conflicting #[repr] hints][34623]
6888 * [When sizing DST, don't double-count nested struct prefixes][36351]
6889 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6890 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6891 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6892 * [Expand macros without recursing to avoid stack overflows][36214]
6897 * [Replace macro backtraces with labeled local uses][35702]
6898 * [Improve error message for misplaced doc comments][33922]
6899 * [Buffer unix and lock windows to prevent message interleaving][35975]
6900 * [Update lifetime errors to specifically note temporaries][36171]
6901 * [Special case a few colors for Windows][36178]
6902 * [Suggest `use self` when such an import resolves][36289]
6903 * [Be more specific when type parameter shadows primitive type][36338]
6904 * Many minor improvements
6906 Compile-time Optimizations
6907 --------------------------
6909 * [Compute and cache HIR hashes at beginning][35854]
6910 * [Don't hash types in loan paths][36004]
6911 * [Cache projections in trans][35761]
6912 * [Optimize the parser's last token handling][36527]
6913 * [Only instantiate #[inline] functions in codegen units referencing
6914 them][36524]. This leads to big improvements in cases where crates export
6915 define many inline functions without using them directly.
6916 * [Lazily allocate TypedArena's first chunk][36592]
6917 * [Don't allocate during default HashSet creation][36734]
6924 * [`overflowing_abs`]
6925 * [`RefCell::try_borrow`]
6926 * [`RefCell::try_borrow_mut`]
6931 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6932 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6934 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6935 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6936 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6937 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6938 * [Use arc4rand on FreeBSD][35884]
6939 * [memrchr: Correct aligned offset computation][35969]
6940 * [Improve Demangling of Rust Symbols][36059]
6941 * [Use monotonic time in condition variables][35048]
6942 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6943 * [Implement conversion traits for `char`][35755]
6944 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6945 * [Zero first byte of CString on drop][36264]
6946 * [Inherit overflow checks for sum and product][36372]
6947 * [Add missing Eq implementations][36423]
6948 * [Implement `Debug` for `DirEntry`][36631]
6949 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6951 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6952 * [Implement more traits for `std::io::ErrorKind`][35911]
6953 * [Optimize BinaryHeap bounds checking][36072]
6954 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6955 `extend_with_element`][36355]
6956 * [Fix overflow checking in unsigned pow()][34942]
6961 * This release includes security fixes to both curl and OpenSSL.
6962 * [Fix transitive doctests when panic=abort][cargo/3021]
6963 * [Add --all-features flag to cargo][cargo/3038]
6964 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6965 * [Don't parse the home directory more than once][cargo/3078]
6966 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6967 * [Update OpenSSL to 1.0.2j][cargo/3121]
6968 * [Add license and license_file to cargo metadata output][cargo/3110]
6969 * [Make crates-io registry URL optional in config; ignore all changes to
6970 source.crates-io][cargo/3089]
6971 * [Don't download dependencies from other platforms][cargo/3123]
6972 * [Build transitive dev-dependencies when needed][cargo/3125]
6973 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6974 * [Avoid updating registry when adding existing deps][cargo/3144]
6975 * [Warn about path overrides that won't work][cargo/3136]
6976 * [Use workspaces during `cargo install`][cargo/3146]
6977 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6978 * [Add --message-format flag][cargo/3000]
6979 * [Pass target environment for rustdoc][cargo/3205]
6980 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6981 * [Update curl and curl-sys][cargo/3241]
6982 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6987 * [rustdoc: Add the `--sysroot` argument][36586]
6988 * [rustdoc: Fix a couple of issues with the search results][35655]
6989 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6990 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6991 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6996 * [Remove unmaintained style guide][35124]
6997 * [Add s390x support][36369]
6998 * [Initial work at Haiku OS support][36727]
6999 * [Add mips-uclibc targets][35734]
7000 * [Crate-ify compiler-rt into compiler-builtins][35021]
7001 * [Add rustc version info (git hash + date) to dist tarball][36213]
7002 * Many documentation improvements
7007 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7008 * [Deny (by default) transmuting from fn item types to pointer-sized
7009 types][34923]. Continuing the long transition to zero-sized fn items,
7011 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7013 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7014 * [Fix lifetime rules for 'if' conditions][36029].
7015 * [Inherit overflow checks for sum and product][36372].
7016 * [Forbid user-defined macros named "macro_rules"][36730].
7018 [33922]: https://github.com/rust-lang/rust/pull/33922
7019 [34623]: https://github.com/rust-lang/rust/pull/34623
7020 [34923]: https://github.com/rust-lang/rust/pull/34923
7021 [34942]: https://github.com/rust-lang/rust/pull/34942
7022 [34982]: https://github.com/rust-lang/rust/pull/34982
7023 [35021]: https://github.com/rust-lang/rust/pull/35021
7024 [35048]: https://github.com/rust-lang/rust/pull/35048
7025 [35074]: https://github.com/rust-lang/rust/pull/35074
7026 [35124]: https://github.com/rust-lang/rust/pull/35124
7027 [35234]: https://github.com/rust-lang/rust/pull/35234
7028 [35238]: https://github.com/rust-lang/rust/pull/35238
7029 [35354]: https://github.com/rust-lang/rust/pull/35354
7030 [35559]: https://github.com/rust-lang/rust/pull/35559
7031 [35585]: https://github.com/rust-lang/rust/pull/35585
7032 [35627]: https://github.com/rust-lang/rust/pull/35627
7033 [35655]: https://github.com/rust-lang/rust/pull/35655
7034 [35702]: https://github.com/rust-lang/rust/pull/35702
7035 [35707]: https://github.com/rust-lang/rust/pull/35707
7036 [35728]: https://github.com/rust-lang/rust/pull/35728
7037 [35734]: https://github.com/rust-lang/rust/pull/35734
7038 [35755]: https://github.com/rust-lang/rust/pull/35755
7039 [35761]: https://github.com/rust-lang/rust/pull/35761
7040 [35764]: https://github.com/rust-lang/rust/pull/35764
7041 [35814]: https://github.com/rust-lang/rust/pull/35814
7042 [35854]: https://github.com/rust-lang/rust/pull/35854
7043 [35871]: https://github.com/rust-lang/rust/pull/35871
7044 [35884]: https://github.com/rust-lang/rust/pull/35884
7045 [35911]: https://github.com/rust-lang/rust/pull/35911
7046 [35969]: https://github.com/rust-lang/rust/pull/35969
7047 [35975]: https://github.com/rust-lang/rust/pull/35975
7048 [36004]: https://github.com/rust-lang/rust/pull/36004
7049 [36008]: https://github.com/rust-lang/rust/pull/36008
7050 [36014]: https://github.com/rust-lang/rust/pull/36014
7051 [36029]: https://github.com/rust-lang/rust/pull/36029
7052 [36059]: https://github.com/rust-lang/rust/pull/36059
7053 [36072]: https://github.com/rust-lang/rust/pull/36072
7054 [36101]: https://github.com/rust-lang/rust/pull/36101
7055 [36104]: https://github.com/rust-lang/rust/pull/36104
7056 [36171]: https://github.com/rust-lang/rust/pull/36171
7057 [36173]: https://github.com/rust-lang/rust/pull/36173
7058 [36178]: https://github.com/rust-lang/rust/pull/36178
7059 [36213]: https://github.com/rust-lang/rust/pull/36213
7060 [36214]: https://github.com/rust-lang/rust/pull/36214
7061 [36264]: https://github.com/rust-lang/rust/pull/36264
7062 [36266]: https://github.com/rust-lang/rust/pull/36266
7063 [36289]: https://github.com/rust-lang/rust/pull/36289
7064 [36338]: https://github.com/rust-lang/rust/pull/36338
7065 [36351]: https://github.com/rust-lang/rust/pull/36351
7066 [36355]: https://github.com/rust-lang/rust/pull/36355
7067 [36369]: https://github.com/rust-lang/rust/pull/36369
7068 [36372]: https://github.com/rust-lang/rust/pull/36372
7069 [36423]: https://github.com/rust-lang/rust/pull/36423
7070 [36482]: https://github.com/rust-lang/rust/pull/36482
7071 [36505]: https://github.com/rust-lang/rust/pull/36505
7072 [36524]: https://github.com/rust-lang/rust/pull/36524
7073 [36527]: https://github.com/rust-lang/rust/pull/36527
7074 [36551]: https://github.com/rust-lang/rust/pull/36551
7075 [36574]: https://github.com/rust-lang/rust/pull/36574
7076 [36586]: https://github.com/rust-lang/rust/pull/36586
7077 [36592]: https://github.com/rust-lang/rust/pull/36592
7078 [36631]: https://github.com/rust-lang/rust/pull/36631
7079 [36639]: https://github.com/rust-lang/rust/pull/36639
7080 [36721]: https://github.com/rust-lang/rust/pull/36721
7081 [36727]: https://github.com/rust-lang/rust/pull/36727
7082 [36730]: https://github.com/rust-lang/rust/pull/36730
7083 [36734]: https://github.com/rust-lang/rust/pull/36734
7084 [36754]: https://github.com/rust-lang/rust/pull/36754
7085 [36995]: https://github.com/rust-lang/rust/pull/36995
7086 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7087 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7088 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7089 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7090 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7091 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7092 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7093 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7094 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7095 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7096 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7097 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7098 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7099 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7100 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7101 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7102 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7103 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7104 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7105 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7106 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7107 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7108 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7109 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7110 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7111 [rustup]: https://www.rustup.rs
7112 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7113 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7114 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7115 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7116 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7117 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7118 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7121 Version 1.12.1 (2016-10-20)
7122 ===========================
7127 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7128 * [Confusion with double negation and booleans][36856]
7129 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7130 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7131 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7132 * [Corrupted memory after updated to 1.12][36936]
7133 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7134 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7135 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7137 [36381]: https://github.com/rust-lang/rust/issues/36381
7138 [36856]: https://github.com/rust-lang/rust/issues/36856
7139 [36875]: https://github.com/rust-lang/rust/issues/36875
7140 [36924]: https://github.com/rust-lang/rust/issues/36924
7141 [36926]: https://github.com/rust-lang/rust/issues/36926
7142 [36936]: https://github.com/rust-lang/rust/issues/36936
7143 [37026]: https://github.com/rust-lang/rust/issues/37026
7144 [37112]: https://github.com/rust-lang/rust/issues/37112
7145 [37153]: https://github.com/rust-lang/rust/issues/37153
7148 Version 1.12.0 (2016-09-29)
7149 ===========================
7154 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7155 This translation pass is far simpler than the previous AST->LLVM pass, and
7156 creates opportunities to perform new optimizations directly on the MIR. It
7157 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7158 * [`rustc` presents a new, more readable error format, along with
7159 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7160 Most common editors supporting Rust have been updated to work with it. It was
7161 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7166 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7167 This translation pass is far simpler than the previous AST->LLVM pass, and
7168 creates opportunities to perform new optimizations directly on the MIR. It
7169 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7170 * [Print the Rust target name, not the LLVM target name, with
7171 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7172 * [The computation of `TypeId` is correct in some cases where it was previously
7173 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7174 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7175 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7176 `--print relocation-models`, and `--print code-models` print the available
7177 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7178 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7179 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7180 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7181 These targets produce statically-linked binaries. There are no binary release
7187 * [`rustc` presents a new, more readable error format, along with
7188 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7189 Most common editors supporting Rust have been updated to work with it. It was
7190 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7191 * [In error descriptions, references are now described in plain English,
7192 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7193 * [In error type descriptions, unknown numeric types are named `{integer}` or
7194 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7195 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7200 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7201 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7202 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7203 useful](https://github.com/rust-lang/rust/pull/34908)
7204 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7205 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7206 * [Semicolons are properly required as statement delimiters inside
7207 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7208 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7213 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7214 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7215 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7216 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7217 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7218 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7219 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7220 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7221 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7222 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7223 Both on Unix and Windows.
7224 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7225 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7226 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7227 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7228 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7229 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7230 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7231 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7236 * [The `format!` macro and friends now allow a single argument to be formatted
7237 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7238 * [The lifetime bounds on `[T]::binary_search_by` and
7239 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7240 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7241 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7242 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7243 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7244 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7245 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7246 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7247 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7248 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7249 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7250 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7251 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7252 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7253 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7254 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7255 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7256 * [`mpsc::sync_channel` `Receiver`s return any available message before
7257 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7258 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7259 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7264 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7265 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7266 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7267 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7268 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7269 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7270 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7271 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7272 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7273 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7274 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7275 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7276 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7277 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7278 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7279 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7284 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7285 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7290 * [Test binaries now support a `--test-threads` argument to specify the number
7291 of threads used to run tests, and which acts the same as the
7292 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7293 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7294 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7295 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7296 * [Rust releases now come with source packages that can be installed by rustup
7297 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7298 The resulting source code can be used by tools and IDES, located in the
7299 sysroot under `lib/rustlib/src`.
7304 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7305 * Many minor improvements to the documentation.
7306 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7311 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7312 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7313 * [When formatting strings, if "precision" is specified, the "fill",
7314 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7315 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7318 Version 1.11.0 (2016-08-18)
7319 ===========================
7324 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7325 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7326 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7327 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7332 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7333 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7334 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7335 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7336 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7337 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7338 (in libcore - previously stabilized in libstd)
7339 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7340 (in libcore - previously stabilized in libstd)
7341 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7342 (in libcore - previously stabilized in libstd)
7343 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7344 (in libcore - previously stabilized in libstd)
7345 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7346 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7347 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7348 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7353 * [The `thread_local!` macro supports multiple definitions in a single
7354 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7355 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7356 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7357 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7358 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7359 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7360 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7361 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7366 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7367 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7368 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7369 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7370 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7371 and `-vv` prints warnings for all crates.
7372 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7373 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7374 This provides room for expansion by arbitrary tools.
7375 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7376 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7377 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7378 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7379 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7380 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7381 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7386 * [Caching projections speeds up type check dramatically for some
7387 workloads](https://github.com/rust-lang/rust/pull/33816)
7388 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7389 This hasher is faster, but is believed to provide sufficient
7390 protection from collision attacks.
7391 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7396 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7397 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7398 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7399 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7400 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7405 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7406 * [When emitting debug info, rustc emits frame pointers for closures,
7407 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7408 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7409 * Many more errors have been given error codes and extended
7411 * API documentation continues to be improved, with many new examples
7416 * [rustc no longer hangs when dependencies recursively re-export
7417 submodules](https://github.com/rust-lang/rust/pull/34542)
7418 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7419 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7420 rewritten](https://github.com/rust-lang/rust/pull/33895)
7421 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7422 No targets use this yet, but it works toward AVR support.
7427 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7428 * [The new follow-set rules that place restrictions on `macro_rules!`
7429 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7430 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7431 and has been a warning since 1.10.
7432 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7433 This causes breakage in some corner cases.
7436 Version 1.10.0 (2016-07-07)
7437 ===========================
7442 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7443 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7444 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7445 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7446 * [`panic!` can be converted to a runtime abort with the
7447 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7448 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7449 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7450 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7451 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7452 Note that Cargo does not yet directly support cdylibs.
7457 * `os::windows::fs::OpenOptionsExt::access_mode`
7458 * `os::windows::fs::OpenOptionsExt::share_mode`
7459 * `os::windows::fs::OpenOptionsExt::custom_flags`
7460 * `os::windows::fs::OpenOptionsExt::attributes`
7461 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7462 * `os::unix::fs::OpenOptionsExt::custom_flags`
7463 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7464 * `Default for sync::Weak`
7465 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7466 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7467 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7468 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7469 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7470 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7471 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7472 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7473 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7474 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7475 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7476 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7477 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7478 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7479 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7480 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7481 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7482 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7483 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7484 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7485 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7486 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7487 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7488 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7489 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7490 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7491 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7492 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7493 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7494 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7495 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7496 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7497 * Read/Write/RawFd impls for `UnixStream`
7498 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7499 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7500 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7501 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7502 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7503 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7504 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7505 * RawFd impls for `UnixListener`
7506 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7507 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7508 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7509 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7510 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7511 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7512 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7513 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7514 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7515 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7516 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7517 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7518 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7519 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7520 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7521 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7522 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7523 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7524 * RawFd impls for `UnixDatagram`
7525 * `{BTree,Hash}Map::values_mut`
7526 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7531 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7532 The semantics of this minor method are subtle and probably not what
7534 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7535 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7536 will fall back to `/dev/urandom` temporarily to avoid blocking
7537 during early boot](https://github.com/rust-lang/rust/pull/33086).
7538 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7539 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7540 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7541 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7542 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7543 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7544 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7548 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7549 This controls the runtime behavior of the `panic!` macro
7550 and can be either "unwind" (the default), or "abort".
7551 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7552 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7553 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7554 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7555 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7556 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7557 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7558 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7559 By default they are retried twice, which can be customized with the
7560 `net.retry` value in `.cargo/config`.
7561 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7562 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7563 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7564 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7565 Makes it possible to install multiple crates in parallel.
7566 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7567 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7568 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7569 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7570 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7571 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7576 * [rustc memory usage was reduced by refactoring the context used for
7577 type checking](https://github.com/rust-lang/rust/pull/33425).
7578 * [Speed up creation of `HashMap`s by caching the random keys used
7579 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7580 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7581 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7582 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7583 10x faster than the previous lookup tables.
7584 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7589 * Many incremental improvements to documentation and rustdoc.
7590 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7591 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7592 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7593 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7594 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7595 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7596 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7601 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7602 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7603 * [`std` no longer prints backtraces on platforms where the running
7604 module must be loaded with `env::current_exe`, which can't be relied
7605 on](https://github.com/rust-lang/rust/pull/33554).
7606 * This release includes std binaries for the i586-unknown-linux-gnu,
7607 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7608 i586 target is for old x86 hardware without SSE2, and the armv7
7609 target is for Android running on modern ARM architectures.
7610 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7611 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7612 * [On Unix the runtime aborts by calling `libc::abort` instead of
7613 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7614 * [Rust is now bootstrapped from the previous release of Rust,
7615 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7620 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7621 * [`target_env` for Linux ARM targets is just `gnu`, not
7622 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7623 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7624 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7625 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7626 Affects how macros are parsed.
7627 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7628 * [Feature-gated attributes on macro-generated macro invocations are
7629 now rejected](https://github.com/rust-lang/rust/pull/32791).
7630 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7631 This caused some minor changes to type inference.
7634 Version 1.9.0 (2016-05-26)
7635 ==========================
7640 * The `#[deprecated]` attribute when applied to an API will generate
7641 warnings when used. The warnings may be suppressed with
7642 `#[allow(deprecated)]`. [RFC 1270].
7643 * [`fn` item types are zero sized, and each `fn` names a unique
7644 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7645 `transmute` on a `fn` type will generate a warning for a few cycles,
7646 then will be converted to an error.
7647 * [Field and method resolution understand visibility, so private
7648 fields and methods cannot prevent the proper use of public fields
7649 and methods][1.9fv].
7650 * [The parser considers unicode codepoints in the
7651 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7657 * [`std::panic::catch_unwind`] (renamed from `recover`)
7658 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7659 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7660 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7661 * [`str::is_char_boundary`]
7662 * [`<*const T>::as_ref`]
7663 * [`<*mut T>::as_ref`]
7664 * [`<*mut T>::as_mut`]
7665 * [`AsciiExt::make_ascii_uppercase`]
7666 * [`AsciiExt::make_ascii_lowercase`]
7667 * [`char::decode_utf16`]
7668 * [`char::DecodeUtf16`]
7669 * [`char::DecodeUtf16Error`]
7670 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7671 * [`BTreeSet::take`]
7672 * [`BTreeSet::replace`]
7675 * [`HashSet::replace`]
7677 * [`OsString::with_capacity`]
7678 * [`OsString::clear`]
7679 * [`OsString::capacity`]
7680 * [`OsString::reserve`]
7681 * [`OsString::reserve_exact`]
7682 * [`OsStr::is_empty`]
7684 * [`std::os::unix::thread`]
7687 * [`JoinHandleExt::as_pthread_t`]
7688 * [`JoinHandleExt::into_pthread_t`]
7689 * [`HashSet::hasher`]
7690 * [`HashMap::hasher`]
7691 * [`CommandExt::exec`]
7692 * [`File::try_clone`]
7693 * [`SocketAddr::set_ip`]
7694 * [`SocketAddr::set_port`]
7695 * [`SocketAddrV4::set_ip`]
7696 * [`SocketAddrV4::set_port`]
7697 * [`SocketAddrV6::set_ip`]
7698 * [`SocketAddrV6::set_port`]
7699 * [`SocketAddrV6::set_flowinfo`]
7700 * [`SocketAddrV6::set_scope_id`]
7701 * [`slice::copy_from_slice`]
7702 * [`ptr::read_volatile`]
7703 * [`ptr::write_volatile`]
7704 * [`OpenOptions::create_new`]
7705 * [`TcpStream::set_nodelay`]
7706 * [`TcpStream::nodelay`]
7707 * [`TcpStream::set_ttl`]
7708 * [`TcpStream::ttl`]
7709 * [`TcpStream::set_only_v6`]
7710 * [`TcpStream::only_v6`]
7711 * [`TcpStream::take_error`]
7712 * [`TcpStream::set_nonblocking`]
7713 * [`TcpListener::set_ttl`]
7714 * [`TcpListener::ttl`]
7715 * [`TcpListener::set_only_v6`]
7716 * [`TcpListener::only_v6`]
7717 * [`TcpListener::take_error`]
7718 * [`TcpListener::set_nonblocking`]
7719 * [`UdpSocket::set_broadcast`]
7720 * [`UdpSocket::broadcast`]
7721 * [`UdpSocket::set_multicast_loop_v4`]
7722 * [`UdpSocket::multicast_loop_v4`]
7723 * [`UdpSocket::set_multicast_ttl_v4`]
7724 * [`UdpSocket::multicast_ttl_v4`]
7725 * [`UdpSocket::set_multicast_loop_v6`]
7726 * [`UdpSocket::multicast_loop_v6`]
7727 * [`UdpSocket::set_multicast_ttl_v6`]
7728 * [`UdpSocket::multicast_ttl_v6`]
7729 * [`UdpSocket::set_ttl`]
7730 * [`UdpSocket::ttl`]
7731 * [`UdpSocket::set_only_v6`]
7732 * [`UdpSocket::only_v6`]
7733 * [`UdpSocket::join_multicast_v4`]
7734 * [`UdpSocket::join_multicast_v6`]
7735 * [`UdpSocket::leave_multicast_v4`]
7736 * [`UdpSocket::leave_multicast_v6`]
7737 * [`UdpSocket::take_error`]
7738 * [`UdpSocket::connect`]
7739 * [`UdpSocket::send`]
7740 * [`UdpSocket::recv`]
7741 * [`UdpSocket::set_nonblocking`]
7746 * [`std::sync::Once` is poisoned if its initialization function
7748 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7749 * [Most types implement `fmt::Debug`][1.9db].
7750 * [The default buffer size used by `BufReader` and `BufWriter` was
7751 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7752 used by other languages.
7753 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7754 `Duration` additionally implements `*=` and `/=`][1.9ta].
7755 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7756 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7757 * [`Chain` implements `BufRead`][1.9ch].
7758 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7763 * [Cargo can now run concurrently][1.9cc].
7764 * [Top-level overrides allow specific revisions of crates to be
7765 overridden through the entire crate graph][1.9ct]. This is intended
7766 to make upgrades easier for large projects, by allowing crates to be
7767 forked temporarily until they've been upgraded and republished.
7768 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7769 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7770 on the commandline][1.9cf]. `rustc` arguments can also be specified
7771 in the `build.rustflags` configuration key.
7776 * [The time complexity of comparing variables for equivalence during type
7777 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7778 to major compilation time improvement in some scenarios.
7779 * [`ToString` is specialized for `str`, giving it the same performance
7780 as `to_owned`][1.9ts].
7781 * [Spawning processes with `Command::output` no longer creates extra
7783 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7784 for C-like enums][1.9cl].
7789 * [Passing the `--quiet` flag to a test runner will produce
7790 much-abbreviated output][1.9q].
7791 * The Rust Project now publishes std binaries for the
7792 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7793 `i586-pc-windows-msvc` targets.
7798 * [`std::sync::Once` is poisoned if its initialization function
7800 * [It is illegal to define methods with the same name in overlapping
7801 inherent `impl` blocks][1.9sn].
7802 * [`fn` item types are zero sized, and each `fn` names a unique
7803 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7804 `transmute` on a `fn` type will generate a warning for a few cycles,
7805 then will be converted to an error.
7806 * [Improvements to const evaluation may trigger new errors when integer
7807 literals are out of range][1.9ce].
7810 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7811 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7812 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7813 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7814 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7815 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7816 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7817 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7818 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7819 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7820 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7821 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7822 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7823 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7824 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7825 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7826 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7827 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7828 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7829 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7830 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7831 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7832 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7833 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7834 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7835 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7836 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7837 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7838 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7839 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7840 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7841 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7842 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7843 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7844 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7845 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7846 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7847 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7848 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7849 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7850 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7851 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7852 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7853 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7854 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7855 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7856 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7857 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7858 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7859 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7860 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7861 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7862 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7863 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7864 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7865 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7866 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7867 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7868 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7869 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7870 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7871 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7872 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7873 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7874 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7875 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7876 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7877 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7878 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7879 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7880 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7881 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7882 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7883 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7884 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7885 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7886 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7887 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7888 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7889 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7890 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7891 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7892 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7893 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7894 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7895 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7896 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7897 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7898 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7899 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7900 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7901 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7902 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7903 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7904 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7905 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7906 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7907 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7908 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7909 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7910 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7911 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7912 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7913 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7914 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7915 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7916 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7917 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7918 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7919 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7922 Version 1.8.0 (2016-04-14)
7923 ==========================
7928 * Rust supports overloading of compound assignment statements like
7929 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7930 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7931 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7933 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7934 addition to the non-braced form, `struct Foo;`. [RFC 218].
7940 * [`str::encode_utf16`] (renamed from `utf16_units`)
7941 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7944 * [`ptr::drop_in_place`]
7946 * [`time::SystemTime`]
7948 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7949 * [`Instant::elapsed`]
7950 * [`SystemTime::now`]
7951 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7952 * [`SystemTime::elapsed`]
7953 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7954 * [`SystemTimeError`]
7955 * [`SystemTimeError::duration`]
7956 * Various impls for `SystemTimeError`
7958 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7959 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7960 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7961 * [The `write!` and `writeln!` macros correctly emit errors if any of
7962 their arguments can't be formatted][1.8w].
7963 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7964 * [The Unix-specific `raw` modules, which contain a number of
7965 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7966 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7967 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7968 across platforms was making it difficult to implement `std`
7969 correctly. Those that need these definitions should use the `libc`
7971 * The Unix-specific `MetadataExt` traits, including
7972 `os::unix::fs::MetadataExt`, which expose values such as inode
7973 numbers [no longer return platform-specific types][1.8r], but
7974 instead return widened integers. [RFC 1415].
7975 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7976 * [Atomic loads and stores are not volatile][1.8a].
7977 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7982 * [Inlining hash functions lead to a 3% compile-time improvement in
7983 some workloads][1.8h].
7984 * When using jemalloc, its symbols are [unprefixed so that it
7985 overrides the libc malloc implementation][1.8h]. This means that for
7986 rustc, LLVM is now using jemalloc, which results in a 6%
7987 compile-time improvement on a specific workload.
7988 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7993 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7994 i686-pc-windows-msvc is now considered a tier-1 platform.
7995 * [The `--print targets` flag prints a list of supported targets][1.8t].
7996 * [The `--print cfg` flag prints the `cfg`s defined for the current
7998 * [`rustc` can be built with an new Cargo-based build system, written
7999 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8000 build system. To enable it configure with `configure --rustbuild`.
8001 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8002 variants while also indicating the total number of missing variants
8003 if more than 3][1.8m].
8004 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8005 * The Rust Project now publishes binary releases of the standard
8006 library for a number of tier-2 targets:
8007 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8008 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8009 `x86_64-rumprun-netbsd`. These can be installed with
8010 tools such as [multirust][1.8mr].
8015 * [`cargo init` creates a new Cargo project in the current
8016 directory][1.8ci]. It is otherwise like `cargo new`.
8017 * [Cargo has configuration keys for `-v` and
8018 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8019 `[term]` section of `.cargo/config`.
8020 * [Configuration keys that evaluate to strings or integers can be set
8021 via environment variables][1.8ce]. For example the `build.jobs` key
8022 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8023 precedence over config files.
8024 * [Target-specific dependencies support Rust `cfg` syntax for
8025 describing targets][1.8cfg] so that dependencies for multiple
8026 targets can be specified together. [RFC 1361].
8027 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8028 `RUSTDOC` take precedence over the `build.target-dir`,
8029 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
8030 * [The child process tree is killed on Windows when Cargo is
8032 * [The `build.target` configuration value sets the target platform,
8033 like `--target`][1.8ct].
8038 * [Unstable compiler flags have been further restricted][1.8u]. Since
8039 1.0 `-Z` flags have been considered unstable, and other flags that
8040 were considered unstable additionally required passing `-Z
8041 unstable-options` to access. Unlike unstable language and library
8042 features though, these options have been accessible on the stable
8043 release channel. Going forward, *new unstable flags will not be
8044 available on the stable release channel*, and old unstable flags
8045 will warn about their usage. In the future, all unstable flags will
8046 be unavailable on the stable release channel.
8047 * [It is no longer possible to `match` on empty enum variants using
8048 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8049 * The Unix-specific `MetadataExt` traits, including
8050 `os::unix::fs::MetadataExt`, which expose values such as inode
8051 numbers [no longer return platform-specific types][1.8r], but
8052 instead return widened integers. [RFC 1415].
8053 * [Modules sourced from the filesystem cannot appear within arbitrary
8054 blocks, but only within other modules][1.8mf].
8055 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8056 * On Unix, [stack overflow triggers a runtime abort instead of a
8058 * [`Command::spawn` and its equivalents return an error if any of
8059 its command-line arguments contain interior `NUL`s][1.8n].
8060 * [Tuple and unit enum variants from other crates are in the type
8062 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8063 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8064 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8065 instead of `foo.lib`.
8068 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8069 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8070 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8071 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8072 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8073 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8074 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8075 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8076 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8077 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8078 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8079 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
8080 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8081 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8082 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8083 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8084 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8085 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8086 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8087 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8088 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8089 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8090 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8091 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8092 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8093 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8094 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8095 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8096 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8097 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8098 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8099 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8100 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8101 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8102 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8103 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8104 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8105 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8106 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8107 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8108 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8109 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8110 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8111 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8112 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8113 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8114 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8115 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8116 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8117 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8118 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8119 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8120 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8121 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8122 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8123 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8124 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8125 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8126 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8127 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8130 Version 1.7.0 (2016-03-03)
8131 ==========================
8138 * [`Path::strip_prefix`] (renamed from relative_from)
8139 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8141 * [`Ipv4Addr::is_loopback`]
8142 * [`Ipv4Addr::is_private`]
8143 * [`Ipv4Addr::is_link_local`]
8144 * [`Ipv4Addr::is_multicast`]
8145 * [`Ipv4Addr::is_broadcast`]
8146 * [`Ipv4Addr::is_documentation`]
8148 * [`Ipv6Addr::is_unspecified`]
8149 * [`Ipv6Addr::is_loopback`]
8150 * [`Ipv6Addr::is_multicast`]
8153 * [`Vec::as_mut_slice`]
8155 * [`String::as_str`]
8156 * [`String::as_mut_str`]
8158 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8160 * `<[T]>::`[`sort_by_key`]
8161 * checked, saturated, and overflowing operations
8162 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8163 * [`i32::saturating_mul`]
8164 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8165 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8166 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8167 * [`u32::saturating_mul`]
8168 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8169 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8170 * and checked, saturated, and overflowing operations for other primitive types
8172 * [`ffi::IntoStringError`]
8173 * [`CString::into_string`]
8174 * [`CString::into_bytes`]
8175 * [`CString::into_bytes_with_nul`]
8176 * `From<CString> for Vec<u8>`
8178 * [`IntoStringError::into_cstring`]
8179 * [`IntoStringError::utf8_error`]
8180 * `Error for IntoStringError`
8182 * [`std::hash::BuildHasher`]
8183 * [`BuildHasher::Hasher`]
8184 * [`BuildHasher::build_hasher`]
8185 * [`std::hash::BuildHasherDefault`]
8186 * [`HashMap::with_hasher`]
8187 * [`HashMap::with_capacity_and_hasher`]
8188 * [`HashSet::with_hasher`]
8189 * [`HashSet::with_capacity_and_hasher`]
8190 * [`std::collections::hash_map::RandomState`]
8191 * [`RandomState::new`]
8192 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8193 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8194 from bytes is faster.
8195 * [The performance of `LineWriter` (and thus `io::stdout`) was
8196 improved by using `memchr` to search for newlines][1.7m].
8197 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8198 `f64` variants were stabilized previously.
8199 * [`BTreeMap` was rewritten to use less memory and improve the performance
8200 of insertion and iteration, the latter by as much as 5x][1.7bm].
8201 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8202 covariant over their contained type][1.7bt].
8203 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8204 over their contained type][1.7ll].
8205 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8207 * [`Any` is implemented for unsized types][1.7a].
8208 * [`Hash` is implemented for `Duration`][1.7h].
8213 * [When running tests with `--test`, rustdoc will pass `--cfg`
8214 arguments to the compiler][1.7dt].
8215 * [The compiler is built with RPATH information by default][1.7rpa].
8216 This means that it will be possible to run `rustc` when installed in
8217 unusual configurations without configuring the dynamic linker search
8219 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8220 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8221 over `LD_LIBRARY_PATH`.
8226 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8227 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8228 * [The `rerun-if-changed` build script directive no longer causes the
8229 build script to incorrectly run twice in certain scenarios][1.7rr].
8234 * Soundness fixes to the interactions between associated types and
8235 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8236 code that violates the new rules. This is a significant change that
8237 is known to break existing code, so it has emitted warnings for the
8238 new error cases since 1.4 to give crate authors time to adapt. The
8239 details of what is changing are subtle; read the RFC for more.
8240 * [Several bugs in the compiler's visibility calculations were
8241 fixed][1.7v]. Since this was found to break significant amounts of
8242 code, the new errors will be emitted as warnings for several release
8243 cycles, under the `private_in_public` lint.
8244 * Defaulted type parameters were accidentally accepted in positions
8245 that were not intended. In this release, [defaulted type parameters
8246 appearing outside of type definitions will generate a
8247 warning][1.7d], which will become an error in future releases.
8248 * [Parsing "." as a float results in an error instead of 0][1.7p].
8249 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8250 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8252 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8253 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8254 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8255 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8256 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8257 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8258 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8259 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8260 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8261 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8262 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8263 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8264 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8265 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8266 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8267 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8268 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8269 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8270 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8271 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8272 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8273 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8274 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8275 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8276 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8277 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8278 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8279 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8280 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8281 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8282 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8283 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8284 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8285 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8286 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8287 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8288 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8289 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8290 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8291 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8292 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8293 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8294 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8295 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8296 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8297 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8298 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8299 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8300 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8301 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8302 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8303 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8304 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8305 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8306 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8307 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8308 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8309 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8310 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8311 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8312 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8313 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8314 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8315 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8316 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8317 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8318 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8319 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8320 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8321 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8322 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8323 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8324 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8325 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8326 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8327 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8328 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8329 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8330 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8333 Version 1.6.0 (2016-01-21)
8334 ==========================
8339 * The `#![no_std]` attribute causes a crate to not be linked to the
8340 standard library, but only the [core library][1.6co], as described
8341 in [RFC 1184]. The core library defines common types and traits but
8342 has no platform dependencies whatsoever, and is the basis for Rust
8343 software in environments that cannot support a full port of the
8344 standard library, such as operating systems. Most of the core
8345 library is now stable.
8351 [`Read::read_exact`],
8352 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8353 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8354 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8355 [`os::unix::fs::DirBuilderExt`],
8356 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8357 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8358 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8359 [`collections::hash_map::Drain`],
8360 [`collections::hash_map::HashMap::drain`],
8361 [`collections::hash_set::Drain`],
8362 [`collections::hash_set::HashSet::drain`],
8363 [`collections::binary_heap::Drain`],
8364 [`collections::binary_heap::BinaryHeap::drain`],
8365 [`Vec::extend_from_slice`] (renamed from `push_all`),
8366 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8367 [`RwLock::into_inner`],
8368 [`Iterator::min_by_key`] (renamed from `min_by`),
8369 [`Iterator::max_by_key`] (renamed from `max_by`).
8370 * The [core library][1.6co] is stable, as are most of its APIs.
8371 * [The `assert_eq!` macro supports arguments that don't implement
8372 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8374 * Several timer functions that take duration in milliseconds [are
8375 deprecated in favor of those that take `Duration`][1.6ms]. These
8376 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8377 `thread::park_timeout_ms`.
8378 * The algorithm by which `Vec` reserves additional elements was
8379 [tweaked to not allocate excessive space][1.6a] while still growing
8381 * `From` conversions are [implemented from integers to floats][1.6f]
8382 in cases where the conversion is lossless. Thus they are not
8383 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8384 or `f64`. They are also not implemented for `isize` and `usize`
8385 because the implementations would be platform-specific. `From` is
8386 also implemented from `f32` to `f64`.
8387 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8388 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8389 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8390 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8392 * Sorting slices that are already sorted [is 50% faster in some
8398 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8399 * Cargo build scripts can specify their dependencies by emitting the
8400 [`rerun-if-changed`][1.6rr] key.
8401 * crates.io will reject publication of crates with dependencies that
8402 have a wildcard version constraint. Crates with wildcard
8403 dependencies were seen to cause a variety of problems, as described
8404 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8406 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8407 release folder. A variety of artifacts that Cargo failed to clean
8408 are now correctly deleted.
8413 * The `unreachable_code` lint [warns when a function call's argument
8415 * The parser indicates [failures that may be caused by
8416 confusingly-similar Unicode characters][1.6uc]
8417 * Certain macro errors [are reported at definition time][1.6m], not
8423 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8424 environment variable when locating crates. This was a pre-cargo
8425 feature for integrating with the package manager that was
8426 accidentally never removed.
8427 * [A number of bugs were fixed in the privacy checker][1.6p] that
8428 could cause previously-accepted code to break.
8429 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8430 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8431 struct pattern syntax (`Foo(..)`) can no longer be used to match
8432 unit structs. This is a warning now, but will become an error in
8433 future releases. Patterns that share the same name as a const are
8435 * A bug was fixed that causes [rustc not to apply default type
8436 parameters][1.6xc] when resolving certain method implementations of
8437 traits defined in other crates.
8439 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8440 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8441 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8442 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8443 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8444 [1.6co]: http://doc.rust-lang.org/core/index.html
8445 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8446 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8447 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8448 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8449 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8450 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8451 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8452 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8453 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8454 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8455 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8456 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8457 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8458 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8459 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8460 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8461 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8462 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8463 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8464 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8465 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8466 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8467 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8468 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8469 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8470 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8471 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8472 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8473 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8474 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8475 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8476 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8477 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8478 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8479 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8480 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8481 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8482 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8483 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8484 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8485 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8488 Version 1.5.0 (2015-12-10)
8489 ==========================
8491 * ~700 changes, numerous bugfixes
8497 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8498 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8499 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8500 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8501 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8502 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8503 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8504 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8505 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8506 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8507 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8508 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8509 [`Path::read_link`], [`Path::symlink_metadata`],
8510 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8511 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8512 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8513 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8514 [`slice::split_first_mut`], [`slice::split_first`],
8515 [`slice::split_last_mut`], [`slice::split_last`],
8516 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8517 [`str::MatchIndices`], [`str::RMatchIndices`],
8518 [`str::match_indices`], [`str::rmatch_indices`],
8519 [`str::slice_mut_unchecked`], [`string::ParseError`].
8520 * Rust applications hosted on crates.io can be installed locally to
8521 `~/.cargo/bin` with the [`cargo install`] command. Among other
8522 things this makes it easier to augment Cargo with new subcommands:
8523 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8524 invoked as `cargo foo`.
8525 * Crates with wildcard (`*`) dependencies will [emit warnings when
8526 published][1.5w]. In 1.6 it will no longer be possible to publish
8527 crates with wildcard dependencies.
8532 * The rules determining when a particular lifetime must outlive
8533 a particular value (known as '[dropck]') have been [modified
8534 to not rely on parametricity][1.5p].
8535 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8536 and `Arc`][1.5a]. Because these smart pointer types implement
8537 `Deref`, this causes breakage in cases where the interior type
8538 contains methods of the same name.
8539 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8540 that they could drop their content. Soundness fix.
8541 * All method invocations are [properly checked][1.5wf1] for
8542 [well-formedness][1.5wf2]. Soundness fix.
8543 * Traits whose supertraits contain `Self` are [not object
8544 safe][1.5o]. Soundness fix.
8545 * Target specifications support a [`no_default_libraries`][1.5nd]
8546 setting that controls whether `-nodefaultlibs` is passed to the
8547 linker, and in turn the `is_like_windows` setting no longer affects
8548 the `-nodefaultlibs` flag.
8549 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8550 * The `#[inline]` and `#[repr]` attributes [can only appear
8551 in valid locations][1.5at].
8552 * Native libraries linked from the local crate are [passed to
8553 the linker before native libraries from upstream crates][1.5nl].
8554 * Two rarely-used attributes, `#[no_debug]` and
8555 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8556 * Negation of unsigned integers, which has been a warning for
8557 several releases, [is now behind a feature gate and will
8558 generate errors][1.5nu].
8559 * The parser accidentally accepted visibility modifiers on
8560 enum variants, a bug [which has been fixed][1.5ev].
8561 * [A bug was fixed that allowed `use` statements to import unstable
8567 * When evaluating expressions at compile-time that are not
8568 compile-time constants (const-evaluating expressions in non-const
8569 contexts), incorrect code such as overlong bitshifts and arithmetic
8570 overflow will [generate a warning instead of an error][1.5ce],
8571 delaying the error until runtime. This will allow the
8572 const-evaluator to be expanded in the future backwards-compatibly.
8573 * The `improper_ctypes` lint [no longer warns about using `isize` and
8574 `usize` in FFI][1.5ict].
8579 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8581 * `Default` is [implemented for mutable slices][1.5d].
8582 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8583 * There are now `From` conversions [between floating point
8584 types][1.5f] where the conversions are lossless.
8585 * There are now `From` conversions [between integer types][1.5i] where
8586 the conversions are lossless.
8587 * [`fs::Metadata` implements `Clone`][1.5fs].
8588 * The `parse` method [accepts a leading "+" when parsing
8590 * [`AsMut` is implemented for `Vec`][1.5am].
8591 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8592 been optimized][1.5cf] and no longer rely on the default impl.
8593 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8594 `unsafe extern "C"` function types now [implement `Clone`,
8595 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8596 `fmt::Debug` for up to 12 arguments][1.5fp].
8597 * [Dropping `Vec`s is much faster in unoptimized builds when the
8598 element types don't implement `Drop`][1.5dv].
8599 * A bug that caused in incorrect behavior when [combining `VecDeque`
8600 with zero-sized types][1.5vdz] was resolved.
8601 * [`PartialOrd` for slices is faster][1.5po].
8606 * [Crate metadata size was reduced by 20%][1.5md].
8607 * [Improvements to code generation reduced the size of libcore by 3.3
8608 MB and rustc's memory usage by 18MB][1.5m].
8609 * [Improvements to deref translation increased performance in
8610 unoptimized builds][1.5dr].
8611 * Various errors in trait resolution [are deduplicated to only be
8612 reported once][1.5te].
8613 * Rust has preliminary [support for rumprun kernels][1.5rr].
8614 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8616 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8617 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8618 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8619 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8620 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8621 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8622 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8623 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8624 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8625 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8626 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8627 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8628 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8629 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8630 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8631 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8632 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8633 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8634 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8635 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8636 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8637 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8638 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8639 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8640 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8641 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8642 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8643 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8644 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8645 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8646 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8647 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8648 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8649 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8650 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8651 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8652 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8653 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8654 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8655 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8656 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8657 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8658 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8659 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8660 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8661 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8662 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8663 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8664 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8665 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8666 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8667 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8668 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8669 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8670 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8671 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8672 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8673 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8674 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8675 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8676 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8677 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8678 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8679 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8680 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8681 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8682 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8683 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8684 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8685 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8686 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8687 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8688 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8689 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8690 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8691 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8692 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8693 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8694 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8695 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8696 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8697 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8698 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8699 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8700 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8701 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8702 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8703 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8704 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8706 Version 1.4.0 (2015-10-29)
8707 ==========================
8709 * ~1200 changes, numerous bugfixes
8714 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8715 GNU) are now supported and recommended for use.
8720 * [Several changes have been made to fix type soundness and improve
8721 the behavior of associated types][sound]. See [RFC 1214]. Although
8722 we have mostly introduced these changes as warnings this release, to
8723 become errors next release, there are still some scenarios that will
8724 see immediate breakage.
8725 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8726 line breaks in addition to `\n`][crlf].
8727 * [Loans of `'static` lifetime extend to the end of a function][stat].
8728 * [`str::parse` no longer introduces avoidable rounding error when
8729 parsing floating point numbers. Together with earlier changes to
8730 float formatting/output, "round trips" like f.to_string().parse()
8731 now preserve the value of f exactly. Additionally, leading plus
8732 signs are now accepted][fp3].
8738 * `use` statements that import multiple items [can now rename
8739 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8740 * [Binops work correctly on fat pointers][binfat].
8741 * `pub extern crate`, which does not behave as expected, [issues a
8742 warning][pec] until a better solution is found.
8747 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8748 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8749 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8750 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8751 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8752 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8753 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8754 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8755 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8756 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8757 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8758 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8759 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8760 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8761 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8762 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8763 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8764 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8766 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8767 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8768 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8769 `f64::from_str_radix`.
8770 * [Reverse-searching strings is faster with the 'two-way'
8772 * [`std::io::copy` allows `?Sized` arguments][cc].
8773 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8774 [override `count`, `nth` and `last` with an *O*(1)
8775 implementation][it].
8776 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8777 * [`IntoRawFd` has been added to the Unix-specific prelude,
8778 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8780 * [`Extend<String>` and `FromIterator<String` are both implemented for
8782 * [`IntoIterator` is implemented for references to `Option` and
8784 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8785 Copy`][ext] as part of [RFC 839]. This will cause type inference
8786 breakage in rare situations.
8787 * [`BinaryHeap` implements `Debug`][bh2].
8788 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8790 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8791 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8792 * [String comparison is faster][faststr].
8793 * `&mut T` where `T: std::fmt::Write` [also implements
8794 `std::fmt::Write`][mutw].
8795 * [A stable regression in `VecDeque::push_back` and other
8796 capacity-altering methods that caused panics for zero-sized types
8798 * [Function pointers implement traits for up to 12 parameters][fp2].
8803 * The compiler [no longer uses the 'morestack' feature to prevent
8804 stack overflow][mm]. Instead it uses guard pages and stack
8805 probes (though stack probes are not yet implemented on any platform
8807 * [The compiler matches traits faster when projections are involved][p].
8808 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8810 * [Cargo now displays useful information about what its doing during
8811 `cargo update`][cu].
8813 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8814 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8815 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8816 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8817 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8818 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8819 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8820 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8821 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8822 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8823 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8824 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8825 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8826 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8827 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8828 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8829 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8830 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8831 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8832 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8833 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8834 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8835 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8836 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8837 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8838 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8839 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8840 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8841 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8842 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8843 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8844 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8845 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8846 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8847 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8848 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8849 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8850 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8851 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8852 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8853 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8854 [bh2]: https://github.com/rust-lang/rust/pull/28156
8855 [binfat]: https://github.com/rust-lang/rust/pull/28270
8856 [bm]: https://github.com/rust-lang/rust/pull/28197
8857 [cc]: https://github.com/rust-lang/rust/pull/27531
8858 [crlf]: https://github.com/rust-lang/rust/pull/28034
8859 [cu]: https://github.com/rust-lang/cargo/pull/1931
8860 [d]: https://github.com/rust-lang/rust/pull/27825
8861 [dep]: https://github.com/rust-lang/rust/pull/28339
8862 [es]: https://github.com/rust-lang/rust/pull/27956
8863 [ext]: https://github.com/rust-lang/rust/pull/28094
8864 [faststr]: https://github.com/rust-lang/rust/pull/28338
8865 [ffi]: https://github.com/rust-lang/rust/pull/28779
8866 [fp]: https://github.com/rust-lang/rust/pull/28268
8867 [fp2]: https://github.com/rust-lang/rust/pull/28560
8868 [fp3]: https://github.com/rust-lang/rust/pull/27307
8869 [i]: https://github.com/rust-lang/rust/pull/27451
8870 [into2]: https://github.com/rust-lang/rust/pull/28039
8871 [it]: https://github.com/rust-lang/rust/pull/27652
8872 [mm]: https://github.com/rust-lang/rust/pull/27338
8873 [mutw]: https://github.com/rust-lang/rust/pull/28368
8874 [sound]: https://github.com/rust-lang/rust/pull/27641
8875 [p]: https://github.com/rust-lang/rust/pull/27866
8876 [pec]: https://github.com/rust-lang/rust/pull/28486
8877 [pr]: https://github.com/rust-lang/rust/pull/27896
8878 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8879 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8880 [s]: https://github.com/rust-lang/rust/pull/27474
8881 [stab]: https://github.com/rust-lang/rust/pull/28339
8882 [stat]: https://github.com/rust-lang/rust/pull/28321
8883 [vd]: https://github.com/rust-lang/rust/pull/28494
8885 Version 1.3.0 (2015-09-17)
8886 ==============================
8888 * ~900 changes, numerous bugfixes
8893 * The [new object lifetime defaults][nold] have been [turned
8894 on][nold2] after a cycle of warnings about the change. Now types
8895 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8896 being interpreted as `&'a Box<Trait+'a>` to `&'a
8897 Box<Trait+'static>`.
8898 * [The Rustonomicon][nom] is a new book in the official documentation
8899 that dives into writing unsafe Rust.
8900 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8901 timekeeping is employed by other std APIs, as well as out-of-tree
8907 * The [new object lifetime defaults][nold] have been [turned
8908 on][nold2] after a cycle of warnings about the change.
8909 * There is a known [regression][lr] in how object lifetime elision is
8910 interpreted, the proper solution for which is undetermined.
8911 * The `#[prelude_import]` attribute, an internal implementation
8912 detail, was accidentally stabilized previously. [It has been put
8913 behind the `prelude_import` feature gate][pi]. This change is
8914 believed to break no existing code.
8915 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8916 [more sane for dynamically sized types][dst3]. Code that relied on
8917 the previous behavior is thought to be broken.
8918 * The `dropck` rules, which checks that destructors can't access
8919 destroyed values, [have been updated][dropck] to match the
8920 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8921 cause some previously-compiling code to no longer build.
8926 * The [new object lifetime defaults][nold] have been [turned
8927 on][nold2] after a cycle of warnings about the change.
8928 * Semicolons may [now follow types and paths in
8929 macros](https://github.com/rust-lang/rust/pull/27000).
8930 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8931 [more sane for dynamically sized types][dst3]. Code that relied on
8932 the previous behavior is not known to exist, and suspected to be
8934 * `'static` variables [may now be recursive][st].
8935 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8936 implementations correctly.
8937 * The `dropck` rules, which checks that destructors can't access
8938 destroyed values, [have been updated][dropck] to match the
8944 * The [`Duration`] API, [has been stabilized][ds], as well as the
8945 `std::time` module, which presently contains only `Duration`.
8946 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8947 * The owned C string, [`CString`], implements [`Borrow`] and the
8948 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8949 these allow C strings to be borrowed and cloned in generic code.
8950 * [`CStr`] implements [`Debug`].
8951 * [`AtomicPtr`] implements [`Debug`].
8952 * [`Error`] trait objects [can be downcast to their concrete types][e]
8953 in many common configurations, using the [`is`], [`downcast`],
8954 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8956 * Searching for substrings now [employs the two-way algorithm][search]
8957 instead of doing a naive search. This gives major speedups to a
8958 number of methods, including [`contains`][sc], [`find`][sf],
8959 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8960 [`ends_with`][sew] are also faster.
8961 * The performance of `PartialEq` for slices is [much faster][ps].
8962 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8963 is overridden and optimized by the implementations for scalars.
8964 * The [`Hasher`] trait now has a number of specialized `write_*`
8965 methods for primitive types, for efficiency.
8966 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8967 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8968 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8969 of [`std::error::Error::cause`][iec] also delegates to the inner
8971 * [`process::Child`][pc] gained the [`id`] method, which returns a
8972 `u32` representing the platform-specific process identifier.
8973 * The [`connect`] method on slices is deprecated, replaced by the new
8974 [`join`] method (note that both of these are on the *unstable*
8975 [`SliceConcatExt`] trait, but through the magic of the prelude are
8976 available to stable code anyway).
8977 * The [`Div`] operator is implemented for [`Wrapping`] types.
8978 * [`DerefMut` is implemented for `String`][dms].
8979 * Performance of SipHash (the default hasher for `HashMap`) is
8980 [better for long data][sh].
8981 * [`AtomicPtr`] implements [`Send`].
8982 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8983 are now [specialized to use uninitialized buffers for increased
8985 * Lifetime parameters of foreign functions [are now resolved
8991 * Rust can now, with some coercion, [produce programs that run on
8992 Windows XP][xp], though XP is not considered a supported platform.
8993 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8994 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8995 recommended for use in 1.3, though should be fully-functional
8996 in the [64-bit 1.4 beta][b14].
8997 * On Fedora-based systems installation will [properly configure the
8998 dynamic linker][fl].
8999 * The compiler gained many new extended error descriptions, which can
9000 be accessed with the `--explain` flag.
9001 * The `dropck` pass, which checks that destructors can't access
9002 destroyed values, [has been rewritten][dropck]. This fixes some
9003 soundness holes, and as such will cause some previously-compiling
9004 code to no longer build.
9005 * `rustc` now uses [LLVM to write archive files where possible][ar].
9006 Eventually this will eliminate the compiler's dependency on the ar
9008 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
9009 supported FreeBSD on x86_64).
9010 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9011 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9013 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9014 will kill the process instead of leaking][nlp].
9016 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9017 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9018 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9019 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9020 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9021 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9022 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9023 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9024 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9025 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9026 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9027 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9028 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9029 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9030 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9031 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9032 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9033 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9034 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9035 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9036 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9037 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9038 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9039 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9040 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9041 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9042 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9043 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9044 [ar]: https://github.com/rust-lang/rust/pull/26926
9045 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9046 [dms]: https://github.com/rust-lang/rust/pull/26241
9047 [dropck]: https://github.com/rust-lang/rust/pull/27261
9048 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9049 [ds]: https://github.com/rust-lang/rust/pull/26818
9050 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9051 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9052 [dst3]: https://github.com/rust-lang/rust/pull/27351
9053 [e]: https://github.com/rust-lang/rust/pull/24793
9054 [f]: https://github.com/rust-lang/rust/pull/26588
9055 [fb]: https://github.com/rust-lang/rust/pull/26959
9056 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9057 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9058 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9059 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9060 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9061 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9062 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9063 [lic]: https://github.com/rust-lang/rust/pull/26583
9064 [lnu]: https://github.com/rust-lang/rust/pull/27026
9065 [lr]: https://github.com/rust-lang/rust/issues/27248
9066 [lum]: https://github.com/rust-lang/rust/pull/26378
9067 [lur]: https://github.com/rust-lang/rust/pull/26783
9068 [nlp]: https://github.com/rust-lang/rust/pull/27176
9069 [nold2]: https://github.com/rust-lang/rust/pull/27045
9070 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9071 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9072 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9073 [pi]: https://github.com/rust-lang/rust/pull/26699
9074 [ps]: https://github.com/rust-lang/rust/pull/26884
9075 [rte]: https://github.com/rust-lang/rust/pull/26950
9076 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9077 [search]: https://github.com/rust-lang/rust/pull/26327
9078 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9079 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9080 [sh]: https://github.com/rust-lang/rust/pull/27280
9081 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9082 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9083 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9084 [st]: https://github.com/rust-lang/rust/pull/26630
9085 [win1]: https://github.com/rust-lang/rust/pull/26569
9086 [win2]: https://github.com/rust-lang/rust/pull/26741
9087 [win3]: https://github.com/rust-lang/rust/pull/26741
9088 [win4]: https://github.com/rust-lang/rust/pull/27210
9089 [xp]: https://github.com/rust-lang/rust/pull/26569
9091 Version 1.2.0 (2015-08-07)
9092 ==========================
9094 * ~1200 changes, numerous bugfixes
9099 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9100 like `Rc` to contain types without a fixed size, arrays and trait
9101 objects, finally enabling use of `Rc<[T]>` and completing the
9102 implementation of DST.
9103 * [Parallel codegen][parcodegen] is now working again, which can
9104 substantially speed up large builds in debug mode; It also gets
9105 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9106 jobs). It's not enabled by default, but will be "in the near
9107 future". It can be activated with the `-C codegen-units=N` flag to
9109 * This is the first release with [experimental support for linking
9110 with the MSVC linker and lib C on Windows (instead of using the GNU
9111 variants via MinGW)][win]. It is yet recommended only for the most
9112 intrepid Rustaceans.
9113 * Benchmark compilations are showing a 30% improvement in
9114 bootstrapping over 1.1.
9119 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9120 unicode case mapping, which is a previously-planned change in
9121 behavior and considered a bugfix.
9122 * [`mem::align_of`] now specifies [the *minimum alignment* for
9123 T][align], which is usually the alignment programs are interested
9124 in, and the same value reported by clang's
9125 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9127 * [The `#[packed]` attribute is no longer silently accepted by the
9128 compiler][packed]. This attribute did nothing and code that
9129 mentioned it likely did not work as intended.
9130 * Associated type defaults are [now behind the
9131 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9132 defaults *did not work*, but could be mentioned syntactically. As
9133 such this breakage has minimal impact.
9138 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9139 matching against dereferenceable values.
9144 * The [`Extend`] trait, which grows a collection from an iterator, is
9145 implemented over iterators of references, for `String`, `Vec`,
9146 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9147 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9148 * The [`iter::once`] function returns an iterator that yields a single
9149 element, and [`iter::empty`] returns an iterator that yields no
9151 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9152 over substring matches.
9153 * [`Cell`] and [`RefCell`] both implement `Eq`.
9154 * A number of methods for wrapping arithmetic are added to the
9155 integral types, [`wrapping_div`], [`wrapping_rem`],
9156 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9157 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9158 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9159 type.. It is illegal for the default arithmetic operations in Rust
9160 to overflow; the desire to wrap must be explicit.
9161 * The `{:#?}` formatting specifier [displays the alternate,
9162 pretty-printed][debugfmt] form of the `Debug` formatter. This
9163 feature was actually introduced prior to 1.0 with little
9165 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9166 for writing data to formatted strings, similar to [`io::Write`].
9167 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9168 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9169 are used by code generators to emit implementations of [`Debug`].
9170 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9171 methods that convert case, following Unicode case mapping.
9172 * It is now easier to handle poisoned locks. The [`PoisonError`]
9173 type, returned by failing lock operations, exposes `into_inner`,
9174 `get_ref`, and `get_mut`, which all give access to the inner lock
9175 guard, and allow the poisoned lock to continue to operate. The
9176 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9177 poisoned lock without attempting to take the lock.
9178 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9179 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9180 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9181 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9183 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9189 * `rustc` employs smarter heuristics for guessing at [typos].
9190 * `rustc` emits more efficient code for [no-op conversions between
9191 unsafe pointers][nop].
9192 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9193 resulting in faster compile times and smaller code.
9195 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9196 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9197 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9198 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9199 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9200 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9201 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9202 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9203 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9204 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9205 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9206 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9207 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9208 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9209 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9210 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9211 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9212 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9213 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9214 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9215 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9216 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9217 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9218 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9219 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9220 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9221 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9222 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9223 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9224 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9225 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9226 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9227 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9228 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9229 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9230 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9231 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9232 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9233 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9234 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9235 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9236 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9237 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9238 [align]: https://github.com/rust-lang/rust/pull/25646
9239 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9240 [typos]: https://github.com/rust-lang/rust/pull/26087
9241 [nop]: https://github.com/rust-lang/rust/pull/26336
9242 [fat]: https://github.com/rust-lang/rust/pull/26411
9243 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9244 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9245 [packed]: https://github.com/rust-lang/rust/pull/25541
9246 [ad]: https://github.com/rust-lang/rust/pull/27382
9247 [win]: https://github.com/rust-lang/rust/pull/25350
9249 Version 1.1.0 (2015-06-25)
9250 =========================
9252 * ~850 changes, numerous bugfixes
9257 * The [`std::fs` module has been expanded][fs] to expand the set of
9258 functionality exposed:
9259 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9260 don't incur a syscall on some platforms.
9261 * A `symlink_metadata` function has been added.
9262 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9263 access to all underlying information.
9264 * The compiler now contains extended explanations of many errors. When an error
9265 with an explanation occurs the compiler suggests using the `--explain` flag
9266 to read the explanation. Error explanations are also [available online][err-index].
9267 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9268 well as other work, the time to bootstrap the compiler decreased by
9274 * The [`str::split_whitespace`] method splits a string on unicode
9275 whitespace boundaries.
9276 * On both Windows and Unix, new extension traits provide conversion of
9277 I/O types to and from the underlying system handles. On Unix, these
9278 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9279 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9280 `TcpListener`, and `UpdSocket`. Further implementations for
9281 `std::process` will be stabilized later.
9282 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9283 Windows, symlinks can be created with
9284 `std::os::windows::symlink_dir` and
9285 `std::os::windows::symlink_file`.
9286 * The `mpsc::Receiver` type can now be converted into an iterator with
9287 `into_iter` on the [`IntoIterator`] trait.
9288 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9289 implementation of the [`From`] trait.
9290 * The `Debug` implementation for `RangeFull` [creates output that is
9291 more consistent with other implementations][rf].
9292 * [`Debug` is implemented for `File`][file].
9293 * The `Default` implementation for `Arc` [no longer requires `Sync +
9295 * [The `Iterator` methods `count`, `nth`, and `last` have been
9296 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9297 * Incorrect handling of paths on Windows has been improved in both the
9298 compiler and the standard library.
9299 * [`AtomicPtr` gained a `Default` implementation][ap].
9300 * In accordance with Rust's policy on arithmetic overflow `abs` now
9301 [panics on overflow when debug assertions are enabled][abs].
9302 * The [`Cloned`] iterator, which was accidentally left unstable for
9303 1.0 [has been stabilized][c].
9304 * The [`Incoming`] iterator, which iterates over incoming TCP
9305 connections, and which was accidentally unnamable in 1.0, [is now
9306 properly exported][inc].
9307 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9308 `sift_up` or `sift_down` panic][bh].
9309 * The [`split_off`] method of `LinkedList` [no longer corrupts
9310 the list in certain scenarios][ll].
9315 * Type checking performance [has improved notably][sk] with
9316 [multiple improvements][pre].
9317 * The compiler [suggests code changes][ch] for more errors.
9318 * rustc and it's build system have experimental support for [building
9319 toolchains against MUSL][m] instead of glibc on Linux.
9320 * The compiler defines the `target_env` cfg value, which is used for
9321 distinguishing toolchains that are otherwise for the same
9322 platform. Presently this is set to `gnu` for common GNU Linux
9323 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9324 * The [`cargo rustc`][crc] command invokes a build with custom flags
9326 * [Android executables are always position independent][pie].
9327 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9330 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9331 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9332 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9333 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9334 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9335 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9336 [rf]: https://github.com/rust-lang/rust/pull/24491
9337 [err-index]: https://doc.rust-lang.org/error-index.html
9338 [sk]: https://github.com/rust-lang/rust/pull/24615
9339 [pre]: https://github.com/rust-lang/rust/pull/25323
9340 [file]: https://github.com/rust-lang/rust/pull/24598
9341 [ch]: https://github.com/rust-lang/rust/pull/24683
9342 [arc]: https://github.com/rust-lang/rust/pull/24695
9343 [si]: https://github.com/rust-lang/rust/pull/24701
9344 [ap]: https://github.com/rust-lang/rust/pull/24834
9345 [m]: https://github.com/rust-lang/rust/pull/24777
9346 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9347 [crc]: https://github.com/rust-lang/cargo/pull/1568
9348 [pie]: https://github.com/rust-lang/rust/pull/24953
9349 [abs]: https://github.com/rust-lang/rust/pull/25441
9350 [c]: https://github.com/rust-lang/rust/pull/25496
9351 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9352 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9353 [inc]: https://github.com/rust-lang/rust/pull/25522
9354 [bh]: https://github.com/rust-lang/rust/pull/25856
9355 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9356 [ll]: https://github.com/rust-lang/rust/pull/26022
9357 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9358 [drop]: https://github.com/rust-lang/rust/pull/24935
9360 Version 1.0.0 (2015-05-15)
9361 ========================
9363 * ~1500 changes, numerous bugfixes
9368 * The vast majority of the standard library is now `#[stable]`. It is
9369 no longer possible to use unstable features with a stable build of
9371 * Many popular crates on [crates.io] now work on the stable release
9373 * Arithmetic on basic integer types now [checks for overflow in debug
9379 * Several [restrictions have been added to trait coherence][coh] in
9380 order to make it easier for upstream authors to change traits
9381 without breaking downstream code.
9382 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9383 improve error messages and macro behavior. For example, `0b1234` is
9384 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9385 * Trait bounds [are always invariant][inv], eliminating the need for
9386 the `PhantomFn` and `MarkerTrait` lang items, which have been
9388 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9389 "foo" as bar` syntax has been replaced with `extern crate foo as
9390 bar`, and Cargo now automatically translates "-" in *package* names
9391 to underscore for the crate name.
9392 * [Lifetime shadowing is an error][lt].
9393 * [`Send` no longer implies `'static`][send-rfc].
9394 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9395 `MyType::default()`.
9396 * Primitive types [now have inherent methods][prim-inherent],
9397 obviating the need for extension traits like `SliceExt`.
9398 * Methods with `Self: Sized` in their `where` clause are [considered
9399 object-safe][self-sized], allowing many extension traits like
9400 `IteratorExt` to be merged into the traits they extended.
9401 * You can now [refer to associated types][assoc-where] whose
9402 corresponding trait bounds appear only in a `where` clause.
9403 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9404 like `Send` and `Sync` are now library-defined.
9405 * A [Reflect trait][reflect] was introduced, which means that
9406 downcasting via the `Any` trait is effectively limited to concrete
9407 types. This helps retain the potentially-important "parametricity"
9408 property: generic code cannot behave differently for different type
9409 arguments except in minor ways.
9410 * The `unsafe_destructor` feature is now deprecated in favor of the
9411 [new `dropck`][dropck]. This change is a major reduction in unsafe
9417 * The `thread_local` module [has been renamed to `std::thread`][th].
9418 * The methods of `IteratorExt` [have been moved to the `Iterator`
9420 * Several traits that implement Rust's conventions for type
9421 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9422 [centralized in the `std::convert` module][con].
9423 * The `FromError` trait [was removed in favor of `From`][fe].
9424 * The basic sleep function [has moved to
9425 `std::thread::sleep_ms`][slp].
9426 * The `splitn` function now takes an `n` parameter that represents the
9427 number of items yielded by the returned iterator [instead of the
9428 number of 'splits'][spl].
9429 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9430 * [Derived implementations of `PartialOrd` now order enums according
9431 to their explicitly-assigned discriminants][po].
9432 * [Methods for searching strings are generic over `Pattern`s][pat],
9433 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9435 * [In method resolution, object methods are resolved before inherent
9437 * [`String::from_str` has been deprecated in favor of the `From` impl,
9438 `String::from`][sf].
9439 * [`io::Error` implements `Sync`][ios].
9440 * [The `words` method on `&str` has been replaced with
9441 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9443 * The new path and IO modules are complete and `#[stable]`. This
9444 was the major library focus for this cycle.
9445 * The path API was [revised][path-normalize] to normalize `.`,
9446 adjusting the tradeoffs in favor of the most common usage.
9447 * A large number of remaining APIs in `std` were also stabilized
9448 during this cycle; about 75% of the non-deprecated API surface
9450 * The new [string pattern API][string-pattern] landed, which makes
9451 the string slice API much more internally consistent and flexible.
9452 * A new set of [generic conversion traits][conversion] replaced
9453 many existing ad hoc traits.
9454 * Generic numeric traits were [completely removed][num-traits]. This
9455 was made possible thanks to inherent methods for primitive types,
9456 and the removal gives maximal flexibility for designing a numeric
9457 hierarchy in the future.
9458 * The `Fn` traits are now related via [inheritance][fn-inherit]
9459 and provide ergonomic [blanket implementations][fn-blanket].
9460 * The `Index` and `IndexMut` traits were changed to
9461 [take the index by value][index-value], enabling code like
9462 `hash_map["string"]` to work.
9463 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9464 `Copy` data is known to be `Clone` as well.
9469 * Many errors now have extended explanations that can be accessed with
9470 the `--explain` flag to `rustc`.
9471 * Many new examples have been added to the standard library
9473 * rustdoc has received a number of improvements focused on completion
9475 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9476 * Much headway was made on ecosystem-wide CI, making it possible
9477 to [compare builds for breakage][ci-compare].
9480 [crates.io]: http://crates.io
9481 [clo]: https://github.com/rust-lang/rust/pull/24034
9482 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9483 [con]: https://github.com/rust-lang/rust/pull/23875
9484 [cr]: https://github.com/rust-lang/rust/pull/23419
9485 [fe]: https://github.com/rust-lang/rust/pull/23879
9486 [ie]: https://github.com/rust-lang/rust/pull/23300
9487 [inv]: https://github.com/rust-lang/rust/pull/23938
9488 [ios]: https://github.com/rust-lang/rust/pull/24133
9489 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9490 [lt]: https://github.com/rust-lang/rust/pull/24057
9491 [meth]: https://github.com/rust-lang/rust/pull/24056
9492 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9493 [po]: https://github.com/rust-lang/rust/pull/24270
9494 [sf]: https://github.com/rust-lang/rust/pull/24517
9495 [slp]: https://github.com/rust-lang/rust/pull/23949
9496 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9497 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9498 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9499 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9500 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9501 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9502 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9503 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9504 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9505 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9506 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9507 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9508 [reflect]: https://github.com/rust-lang/rust/pull/23712
9509 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9510 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9511 [index-value]: https://github.com/rust-lang/rust/pull/23601
9512 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9513 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9514 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9515 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9516 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9517 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9520 Version 1.0.0-alpha.2 (2015-02-20)
9521 =====================================
9523 * ~1300 changes, numerous bugfixes
9527 * The various I/O modules were [overhauled][io-rfc] to reduce
9528 unnecessary abstractions and provide better interoperation with
9529 the underlying platform. The old `io` module remains temporarily
9531 * The standard library now [participates in feature gating][feat],
9532 so use of unstable libraries now requires a `#![feature(...)]`
9533 attribute. The impact of this change is [described on the
9534 forum][feat-forum]. [RFC][feat-rfc].
9538 * `for` loops [now operate on the `IntoIterator` trait][into],
9539 which eliminates the need to call `.iter()`, etc. to iterate
9540 over collections. There are some new subtleties to remember
9541 though regarding what sort of iterators various types yield, in
9542 particular that `for foo in bar { }` yields values from a move
9543 iterator, destroying the original collection. [RFC][into-rfc].
9544 * Objects now have [default lifetime bounds][obj], so you don't
9545 have to write `Box<Trait+'static>` when you don't care about
9546 storing references. [RFC][obj-rfc].
9547 * In types that implement `Drop`, [lifetimes must outlive the
9548 value][drop]. This will soon make it possible to safely
9549 implement `Drop` for types where `#[unsafe_destructor]` is now
9550 required. Read the [gorgeous RFC][drop-rfc] for details.
9551 * The fully qualified <T as Trait>::X syntax lets you set the Self
9552 type for a trait method or associated type. [RFC][ufcs-rfc].
9553 * References to types that implement `Deref<U>` now [automatically
9554 coerce to references][deref] to the dereferenced type `U`,
9555 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9556 should eliminate many unsightly uses of `&*`, as when converting
9557 from references to vectors into references to
9558 slices. [RFC][deref-rfc].
9559 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9560 `|:|`) is obsolete and closure kind is inferred from context.
9561 * [`Self` is a keyword][Self].
9565 * The `Show` and `String` formatting traits [have been
9566 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9567 their related purposes. Automatically getting a string
9568 conversion to use with `format!("{:?}", something_to_debug)` is
9569 now written `#[derive(Debug)]`.
9570 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9571 OsStr}`, provide strings in platform-specific encodings for easier
9572 interop with system APIs. [RFC][osstr-rfc].
9573 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9574 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9575 creating raw pointers.
9579 * Certain long error messages of the form 'expected foo found bar'
9580 are now [split neatly across multiple
9581 lines][multiline]. Examples in the PR.
9582 * On Unix Rust can be [uninstalled][un] by running
9583 `/usr/local/lib/rustlib/uninstall.sh`.
9584 * The `#[rustc_on_unimplemented]` attribute, requiring the
9585 'on_unimplemented' feature, lets rustc [display custom error
9586 messages when a trait is expected to be implemented for a type
9591 * Rust is tested against a [LALR grammar][lalr], which parses
9592 almost all the Rust files that rustc does.
9594 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9595 [close]: https://github.com/rust-lang/rust/pull/21843
9596 [deref]: https://github.com/rust-lang/rust/pull/21351
9597 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9598 [drop]: https://github.com/rust-lang/rust/pull/21972
9599 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9600 [feat]: https://github.com/rust-lang/rust/pull/21248
9601 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9602 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9603 [fmt]: https://github.com/rust-lang/rust/pull/21457
9604 [into]: https://github.com/rust-lang/rust/pull/20790
9605 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9606 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9607 [lalr]: https://github.com/rust-lang/rust/pull/21452
9608 [multiline]: https://github.com/rust-lang/rust/pull/19870
9609 [obj]: https://github.com/rust-lang/rust/pull/22230
9610 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9611 [onun]: https://github.com/rust-lang/rust/pull/20889
9612 [osstr]: https://github.com/rust-lang/rust/pull/21488
9613 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9614 [Self]: https://github.com/rust-lang/rust/pull/22158
9615 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9616 [un]: https://github.com/rust-lang/rust/pull/22256
9619 Version 1.0.0-alpha (2015-01-09)
9620 ==================================
9622 * ~2400 changes, numerous bugfixes
9626 * The language itself is considered feature complete for 1.0,
9627 though there will be many usability improvements and bugfixes
9628 before the final release.
9629 * Nearly 50% of the public API surface of the standard library has
9630 been declared 'stable'. Those interfaces are unlikely to change
9632 * The long-running debate over integer types has been
9633 [settled][ints]: Rust will ship with types named `isize` and
9634 `usize`, rather than `int` and `uint`, for pointer-sized
9635 integers. Guidelines will be rolled out during the alpha cycle.
9636 * Most crates that are not `std` have been moved out of the Rust
9637 distribution into the Cargo ecosystem so they can evolve
9638 separately and don't need to be stabilized as quickly, including
9639 'time', 'getopts', 'num', 'regex', and 'term'.
9640 * Documentation continues to be expanded with more API coverage, more
9641 examples, and more in-depth explanations. The guides have been
9642 consolidated into [The Rust Programming Language][trpl].
9643 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9644 * All official Rust binary installers now come with [Cargo], the
9645 Rust package manager.
9649 * Closures have been [completely redesigned][unboxed] to be
9650 implemented in terms of traits, can now be used as generic type
9651 bounds and thus monomorphized and inlined, or via an opaque
9652 pointer (boxed) as in the old system. The new system is often
9653 referred to as 'unboxed' closures.
9654 * Traits now support [associated types][assoc], allowing families
9655 of related types to be defined together and used generically in
9657 * Enum variants are [namespaced by their type names][enum].
9658 * [`where` clauses][where] provide a more versatile and attractive
9659 syntax for specifying generic bounds, though the previous syntax
9661 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9663 * Rust [no longer has a runtime][rt] of any description, and only
9664 supports OS threads, not green threads.
9665 * At long last, Rust has been overhauled for 'dynamically-sized
9666 types' ([DST]), which integrates 'fat pointers' (object types,
9667 arrays, and `str`) more deeply into the type system, making it
9669 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9670 `..j` that produce range types and which, when combined with the
9671 `Index` operator and multidispatch, leads to a convenient slice
9673 * The new range syntax revealed an ambiguity in the fixed-length
9674 array syntax, so now fixed length arrays [are written `[T;
9676 * The `Copy` trait is no longer implemented automatically. Unsafe
9677 pointers no longer implement `Sync` and `Send` so types
9678 containing them don't automatically either. `Sync` and `Send`
9679 are now 'unsafe traits' so one can "forcibly" implement them via
9680 `unsafe impl` if a type confirms to the requirements for them
9681 even though the internals do not (e.g. structs containing unsafe
9682 pointers like `Arc`). These changes are intended to prevent some
9683 footguns and are collectively known as [opt-in built-in
9684 traits][oibit] (though `Sync` and `Send` will soon become pure
9685 library types unknown to the compiler).
9686 * Operator traits now take their operands [by value][ops], and
9687 comparison traits can use multidispatch to compare one type
9688 against multiple other types, allowing e.g. `String` to be
9689 compared with `&str`.
9690 * `if let` and `while let` are no longer feature-gated.
9691 * Rust has adopted a more [uniform syntax for escaping unicode
9692 characters][unicode].
9693 * `macro_rules!` [has been declared stable][mac]. Though it is a
9694 flawed system it is sufficiently popular that it must be usable
9695 for 1.0. Effort has gone into [future-proofing][mac-future] it
9696 in ways that will allow other macro systems to be developed in
9697 parallel, and won't otherwise impact the evolution of the
9699 * The prelude has been [pared back significantly][prelude] such
9700 that it is the minimum necessary to support the most pervasive
9701 code patterns, and through [generalized where clauses][where]
9702 many of the prelude extension traits have been consolidated.
9703 * Rust's rudimentary reflection [has been removed][refl], as it
9704 incurred too much code generation for little benefit.
9705 * [Struct variants][structvars] are no longer feature-gated.
9706 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9707 known as 'higher-ranked trait bounds', this crucially allows
9708 unboxed closures to work.
9709 * Macros invocations surrounded by parens or square brackets and
9710 not terminated by a semicolon are [parsed as
9711 expressions][macros], which makes expressions like `vec![1i32,
9712 2, 3].len()` work as expected.
9713 * Trait objects now implement their traits automatically, and
9714 traits that can be coerced to objects now must be [object
9716 * Automatically deriving traits is now done with `#[derive(...)]`
9717 not `#[deriving(...)]` for [consistency with other naming
9718 conventions][derive].
9719 * Importing the containing module or enum at the same time as
9720 items or variants they contain is [now done with `self` instead
9721 of `mod`][self], as in use `foo::{self, bar}`
9722 * Glob imports are no longer feature-gated.
9723 * The `box` operator and `box` patterns have been feature-gated
9724 pending a redesign. For now unique boxes should be allocated
9725 like other containers, with `Box::new`.
9729 * A [series][coll1] of [efforts][coll2] to establish
9730 [conventions][coll3] for collections types has resulted in API
9731 improvements throughout the standard library.
9732 * New [APIs for error handling][err] provide ergonomic interop
9733 between error types, and [new conventions][err-conv] describe
9734 more clearly the recommended error handling strategies in Rust.
9735 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9736 it is easier to discuss failure in the context of error handling
9737 without making clarifications as to whether you are referring to
9738 the 'fail' macro or failure more generally.
9739 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9740 syscall when available.
9741 * The 'serialize' crate has been renamed 'rustc-serialize' and
9742 moved out of the distribution to Cargo. Although it is widely
9743 used now, it is expected to be superseded in the near future.
9744 * The `Show` formatter, typically implemented with
9745 `#[derive(Show)]` is [now requested with the `{:?}`
9746 specifier][show] and is intended for use by all types, for uses
9747 such as `println!` debugging. The new `String` formatter must be
9748 implemented by hand, uses the `{}` specifier, and is intended
9749 for full-fidelity conversions of things that can logically be
9750 represented as strings.
9754 * [Flexible target specification][flex] allows rustc's code
9755 generation to be configured to support otherwise-unsupported
9757 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9758 respective debuggers with Rust-appropriate pretty-printing.
9759 * The Windows installation of Rust is distributed with the
9760 MinGW components currently required to link binaries on that
9765 * Nullable enum optimizations have been extended to more types so
9766 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9767 space than the inner types themselves.
9768 * Work has begun on supporting AArch64.
9770 [Cargo]: https://crates.io
9771 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9772 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9773 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9774 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9775 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9776 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9777 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9778 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9779 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9780 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9781 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9782 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9783 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9784 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9785 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9786 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9787 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9788 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9789 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9790 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9791 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9792 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9793 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9794 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9795 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9796 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9797 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9798 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9799 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9800 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9801 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9802 [trpl]: https://doc.rust-lang.org/book/index.html
9803 [rbe]: http://rustbyexample.com/
9806 Version 0.12.0 (2014-10-09)
9807 =============================
9809 * ~1900 changes, numerous bugfixes
9813 * The introductory documentation (now called The Rust Guide) has
9814 been completely rewritten, as have a number of supplementary
9816 * Rust's package manager, Cargo, continues to improve and is
9817 sometimes considered to be quite awesome.
9818 * Many API's in `std` have been reviewed and updated for
9819 consistency with the in-development Rust coding
9820 guidelines. The standard library documentation tracks
9821 stabilization progress.
9822 * Minor libraries have been moved out-of-tree to the rust-lang org
9823 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9824 be installed with Cargo.
9825 * Lifetime elision allows lifetime annotations to be left off of
9826 function declarations in many common scenarios.
9827 * Rust now works on 64-bit Windows.
9830 * Indexing can be overloaded with the `Index` and `IndexMut`
9832 * The `if let` construct takes a branch only if the `let` pattern
9833 matches, currently behind the 'if_let' feature gate.
9834 * 'where clauses', a more flexible syntax for specifying trait
9835 bounds that is more aesthetic, have been added for traits and
9836 free functions. Where clauses will in the future make it
9837 possible to constrain associated types, which would be
9838 impossible with the existing syntax.
9839 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9840 the 'slicing_syntax' feature gate, and can be overloaded with
9841 the `Slice` or `SliceMut` traits.
9842 * The syntax for matching of sub-slices has been changed to use a
9843 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9844 consistency with other uses of `..` and to future-proof
9845 potential additional uses of the syntax.
9846 * The syntax for matching inclusive ranges in patterns has changed
9847 from `0..3` to `0...4` to be consistent with the exclusive range
9849 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9850 c]`) has been put behind the 'advanced_slice_patterns' feature
9851 gate and may be removed in the future.
9852 * Components of tuples and tuple structs can be extracted using
9853 the `value.0` syntax, currently behind the `tuple_indexing`
9855 * The `#[crate_id]` attribute is no longer supported; versioning
9856 is handled by the package manager.
9857 * Renaming crate imports are now written `extern crate foo as bar`
9858 instead of `extern crate bar = foo`.
9859 * Renaming use statements are now written `use foo as bar` instead
9861 * `let` and `match` bindings and argument names in macros are now
9863 * The new, more efficient, closure types ('unboxed closures') have
9864 been added under a feature gate, 'unboxed_closures'. These will
9865 soon replace the existing closure types, once higher-ranked
9866 trait lifetimes are added to the language.
9867 * `move` has been added as a keyword, for indicating closures
9868 that capture by value.
9869 * Mutation and assignment is no longer allowed in pattern guards.
9870 * Generic structs and enums can now have trait bounds.
9871 * The `Share` trait is now called `Sync` to free up the term
9872 'shared' to refer to 'shared reference' (the default reference
9874 * Dynamically-sized types have been mostly implemented,
9875 unifying the behavior of fat-pointer types with the rest of the
9877 * As part of dynamically-sized types, the `Sized` trait has been
9878 introduced, which qualifying types implement by default, and
9879 which type parameters expect by default. To specify that a type
9880 parameter does not need to be sized, write `<Sized? T>`. Most
9881 types are `Sized`, notable exceptions being unsized arrays
9882 (`[T]`) and trait types.
9883 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9884 * Lifetime bounds can now be applied to type parameters and object
9886 * The old, reference counted GC type, `Gc<T>` which was once
9887 denoted by the `@` sigil, has finally been removed. GC will be
9888 revisited in the future.
9891 * Library documentation has been improved for a number of modules.
9892 * Bit-vectors, collections::bitv has been modernized.
9893 * The url crate is deprecated in favor of
9894 http://github.com/servo/rust-url, which can be installed with
9896 * Most I/O stream types can be cloned and subsequently closed from
9898 * A `std::time::Duration` type has been added for use in I/O
9899 methods that rely on timers, as well as in the 'time' crate's
9900 `Timespec` arithmetic.
9901 * The runtime I/O abstraction layer that enabled the green thread
9902 scheduler to do non-thread-blocking I/O has been removed, along
9903 with the libuv-based implementation employed by the green thread
9904 scheduler. This will greatly simplify the future I/O work.
9905 * `collections::btree` has been rewritten to have a more
9906 idiomatic and efficient design.
9909 * rustdoc output now indicates the stability levels of API's.
9910 * The `--crate-name` flag can specify the name of the crate
9911 being compiled, like `#[crate_name]`.
9912 * The `-C metadata` specifies additional metadata to hash into
9913 symbol names, and `-C extra-filename` specifies additional
9914 information to put into the output filename, for use by the
9915 package manager for versioning.
9916 * debug info generation has continued to improve and should be
9917 more reliable under both gdb and lldb.
9918 * rustc has experimental support for compiling in parallel
9919 using the `-C codegen-units` flag.
9920 * rustc no longer encodes rpath information into binaries by
9924 * Stack usage has been optimized with LLVM lifetime annotations.
9925 * Official Rust binaries on Linux are more compatible with older
9926 kernels and distributions, built on CentOS 5.10.
9929 Version 0.11.0 (2014-07-02)
9930 ==========================
9932 * ~1700 changes, numerous bugfixes
9935 * ~[T] has been removed from the language. This type is superseded by
9937 * ~str has been removed from the language. This type is superseded by
9939 * ~T has been removed from the language. This type is superseded by the
9941 * @T has been removed from the language. This type is superseded by the
9942 standard library's std::gc::Gc<T> type.
9943 * Struct fields are now all private by default.
9944 * Vector indices and shift amounts are both required to be a `uint`
9945 instead of any integral type.
9946 * Byte character, byte string, and raw byte string literals are now all
9947 supported by prefixing the normal literal with a `b`.
9948 * Multiple ABIs are no longer allowed in an ABI string
9949 * The syntax for lifetimes on closures/procedures has been tweaked
9950 slightly: `<'a>|A, B|: 'b + K -> T`
9951 * Floating point modulus has been removed from the language; however it
9952 is still provided by a library implementation.
9953 * Private enum variants are now disallowed.
9954 * The `priv` keyword has been removed from the language.
9955 * A closure can no longer be invoked through a &-pointer.
9956 * The `use foo, bar, baz;` syntax has been removed from the language.
9957 * The transmute intrinsic no longer works on type parameters.
9958 * Statics now allow blocks/items in their definition.
9959 * Trait bounds are separated from objects with + instead of : now.
9960 * Objects can no longer be read while they are mutably borrowed.
9961 * The address of a static is now marked as insignificant unless the
9962 #[inline(never)] attribute is placed it.
9963 * The #[unsafe_destructor] attribute is now behind a feature gate.
9964 * Struct literals are no longer allowed in ambiguous positions such as
9965 if, while, match, and for..in.
9966 * Declaration of lang items and intrinsics are now feature-gated by
9968 * Integral literals no longer default to `int`, and floating point
9969 literals no longer default to `f64`. Literals must be suffixed with an
9970 appropriate type if inference cannot determine the type of the
9972 * The Box<T> type is no longer implicitly borrowed to &mut T.
9973 * Procedures are now required to not capture borrowed references.
9976 * The standard library is now a "facade" over a number of underlying
9977 libraries. This means that development on the standard library should
9978 be speedier due to smaller crates, as well as a clearer line between
9980 * A new library, libcore, lives under the standard library's facade
9981 which is Rust's "0-assumption" library, suitable for embedded and
9982 kernel development for example.
9983 * A regex crate has been added to the standard distribution. This crate
9984 includes statically compiled regular expressions.
9985 * The unwrap/unwrap_err methods on Result require a Show bound for
9986 better error messages.
9987 * The return types of the std::comm primitives have been centralized
9988 around the Result type.
9989 * A number of I/O primitives have gained the ability to time out their
9991 * A number of I/O primitives have gained the ability to close their
9992 reading/writing halves to cancel pending operations.
9993 * Reverse iterator methods have been removed in favor of `rev()` on
9994 their forward-iteration counterparts.
9995 * A bitflags! macro has been added to enable easy interop with C and
9996 management of bit flags.
9997 * A debug_assert! macro is now provided which is disabled when
9998 `--cfg ndebug` is passed to the compiler.
9999 * A graphviz crate has been added for creating .dot files.
10000 * The std::cast module has been migrated into std::mem.
10001 * The std::local_data api has been migrated from freestanding functions
10002 to being based on methods.
10003 * The Pod trait has been renamed to Copy.
10004 * jemalloc has been added as the default allocator for types.
10005 * The API for allocating memory has been changed to use proper alignment
10006 and sized deallocation
10007 * Connecting a TcpStream or binding a TcpListener is now based on a
10008 string address and a u16 port. This allows connecting to a hostname as
10010 * The Reader trait now contains a core method, read_at_least(), which
10011 correctly handles many repeated 0-length reads.
10012 * The process-spawning API is now centered around a builder-style
10014 * The :? printing qualifier has been moved from the standard library to
10015 an external libdebug crate.
10016 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10017 have been renamed to Eq/Ord.
10018 * The select/plural methods have been removed from format!. The escapes
10019 for { and } have also changed from \{ and \} to {{ and }},
10021 * The TaskBuilder API has been re-worked to be a true builder, and
10022 extension traits for spawning native/green tasks have been added.
10025 * All breaking changes to the language or libraries now have their
10026 commit message annotated with `[breaking-change]` to allow for easy
10027 discovery of breaking changes.
10028 * The compiler will now try to suggest how to annotate lifetimes if a
10029 lifetime-related error occurs.
10030 * Debug info continues to be improved greatly with general bug fixes and
10031 better support for situations like link time optimization (LTO).
10032 * Usage of syntax extensions when cross-compiling has been fixed.
10033 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10034 -fdata-sections and --gc-sections has been enabled by default
10035 * The compiler is now stricter about where it will load module files
10036 from when a module is declared via `mod foo;`.
10037 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10038 Syntax extensions are now discovered via a "plugin registrar" type
10039 which will be extended in the future to other various plugins.
10040 * Lints have been restructured to allow for dynamically loadable lints.
10041 * A number of rustdoc improvements:
10042 * The HTML output has been visually redesigned.
10043 * Markdown is now powered by hoedown instead of sundown.
10044 * Searching heuristics have been greatly improved.
10045 * The search index has been reduced in size by a great amount.
10046 * Cross-crate documentation via `pub use` has been greatly improved.
10047 * Primitive types are now hyperlinked and documented.
10048 * Documentation has been moved from static.rust-lang.org/doc to
10050 * A new sandbox, play.rust-lang.org, is available for running and
10051 sharing rust code examples on-line.
10052 * Unused attributes are now more robustly warned about.
10053 * The dead_code lint now warns about unused struct fields.
10054 * Cross-compiling to iOS is now supported.
10055 * Cross-compiling to mipsel is now supported.
10056 * Stability attributes are now inherited by default and no longer apply
10057 to intra-crate usage, only inter-crate usage.
10058 * Error message related to non-exhaustive match expressions have been
10062 Version 0.10 (2014-04-03)
10063 =========================
10065 * ~1500 changes, numerous bugfixes
10068 * A new RFC process is now in place for modifying the language.
10069 * Patterns with `@`-pointers have been removed from the language.
10070 * Patterns with unique vectors (`~[T]`) have been removed from the
10072 * Patterns with unique strings (`~str`) have been removed from the
10074 * `@str` has been removed from the language.
10075 * `@[T]` has been removed from the language.
10076 * `@self` has been removed from the language.
10077 * `@Trait` has been removed from the language.
10078 * Headers on `~` allocations which contain `@` boxes inside the type for
10079 reference counting have been removed.
10080 * The semantics around the lifetimes of temporary expressions have changed,
10081 see #3511 and #11585 for more information.
10082 * Cross-crate syntax extensions are now possible, but feature gated. See
10083 #11151 for more information. This includes both `macro_rules!` macros as
10084 well as syntax extensions such as `format!`.
10085 * New lint modes have been added, and older ones have been turned on to be
10087 * Unnecessary parentheses
10088 * Uppercase statics
10090 * Uppercase variables
10091 * Publicly visible private types
10092 * `#[deriving]` with raw pointers
10093 * Unsafe functions can no longer be coerced to closures.
10094 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10095 * The `#[simd]` attribute is now behind a feature gate.
10096 * Visibility is no longer allowed on `extern crate` statements, and
10097 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10098 * Trailing commas are now allowed in argument lists and tuple patterns.
10099 * The `do` keyword has been removed, it is now a reserved keyword.
10100 * Default type parameters have been implemented, but are feature gated.
10101 * Borrowed variables through captures in closures are now considered soundly.
10102 * `extern mod` is now `extern crate`
10103 * The `Freeze` trait has been removed.
10104 * The `Share` trait has been added for types that can be shared among
10106 * Labels in macros are now hygienic.
10107 * Expression/statement macro invocations can be delimited with `{}` now.
10108 * Treatment of types allowed in `static mut` locations has been tweaked.
10109 * The `*` and `.` operators are now overloadable through the `Deref` and
10111 * `~Trait` and `proc` no longer have `Send` bounds by default.
10112 * Partial type hints are now supported with the `_` type marker.
10113 * An `Unsafe` type was introduced for interior mutability. It is now
10114 considered undefined to transmute from `&T` to `&mut T` without using the
10116 * The #[linkage] attribute was implemented for extern statics/functions.
10117 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10118 * `Pod` was renamed to `Copy`.
10121 * The `libextra` library has been removed. It has now been decomposed into
10122 component libraries with smaller and more focused nuggets of
10123 functionality. The full list of libraries can be found on the
10124 documentation index page.
10125 * std: `std::condition` has been removed. All I/O errors are now propagated
10126 through the `Result` type. In order to assist with error handling, a
10127 `try!` macro for unwrapping errors with an early return and a lint for
10128 unused results has been added. See #12039 for more information.
10129 * std: The `vec` module has been renamed to `slice`.
10130 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10131 This will become the only growable vector in the future.
10132 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10133 are now found at `std::io::BufferedReader` instead of
10134 `std::io::buffered::BufferedReader`.
10135 * std: `print` and `println` are no longer in the prelude, the `print!` and
10136 `println!` macros are intended to be used instead.
10137 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10138 attempts to statically prevent cycles.
10139 * std: The standard distribution is adopting the policy of pushing failure
10140 to the user rather than failing in libraries. Many functions (such as
10141 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10142 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10143 deriving mode: `#[deriving(Show)]`.
10144 * std: `ToStr` is now implemented for all types implementing `Show`.
10145 * std: The formatting trait methods now take `&self` instead of `&T`
10146 * std: The `invert()` method on iterators has been renamed to `rev()`
10147 * std: `std::num` has seen a reduction in the genericity of its traits,
10148 consolidating functionality into a few core traits.
10149 * std: Backtraces are now printed on task failure if the environment
10150 variable `RUST_BACKTRACE` is present.
10151 * std: Naming conventions for iterators have been standardized. More details
10152 can be found on the wiki's style guide.
10153 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10154 still implement the function.
10155 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10156 * std: `assert_approx_eq!` has been removed
10157 * std: The `e` and `E` formatting specifiers for floats have been added to
10158 print them in exponential notation.
10159 * std: The `Times` trait has been removed
10160 * std: Indications of variance and opting out of builtin bounds is done
10161 through marker types in `std::kinds::marker` now
10162 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10163 `#[deriving(Hash)]` is now possible.
10164 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10165 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10166 * std: `Chan::new` is now `channel()`.
10167 * std: A new synchronous channel type has been implemented.
10168 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10169 * std: `hashmap` and `trie` have been moved to `libcollections`
10170 * std: `run` has been rolled into `io::process`
10171 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10172 * std: The equality and comparison traits have seen some reorganization.
10173 * std: `rand` has moved to `librand`.
10174 * std: `to_{lower,upper}case` has been implemented for `char`.
10175 * std: Logging has been moved to `liblog`.
10176 * collections: `HashMap` has been rewritten for higher performance and less
10178 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10179 it can be booted manually. The runtime guide has more information and
10181 * native: All I/O functionality except signals has been implemented.
10182 * green: Task spawning with `libgreen` has been optimized with stack caching
10183 and various trimming of code.
10184 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10185 * sync: The `extra::sync` module has been updated to modern rust (and moved
10186 to the `sync` library), tweaking and improving various interfaces while
10187 dropping redundant functionality.
10188 * sync: A new `Barrier` type has been added to the `sync` library.
10189 * sync: An efficient mutex for native and green tasks has been implemented.
10190 * serialize: The `base64` module has seen some improvement. It treats
10191 newlines better, has non-string error values, and has seen general
10193 * fourcc: A `fourcc!` macro was introduced
10194 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10195 hexadecimal literal.
10198 * `rustpkg` has been deprecated and removed from the main repository. Its
10199 replacement, `cargo`, is under development.
10200 * Nightly builds of rust are now available
10201 * The memory usage of rustc has been improved many times throughout this
10203 * The build process supports disabling rpath support for the rustc binary
10205 * Code generation has improved in some cases, giving more information to the
10206 LLVM optimization passes to enable more extensive optimizations.
10207 * Debuginfo compatibility with lldb on OSX has been restored.
10208 * The master branch is now gated on an android bot, making building for
10209 android much more reliable.
10210 * Output flags have been centralized into one `--emit` flag.
10211 * Crate type flags have been centralized into one `--crate-type` flag.
10212 * Codegen flags have been consolidated behind a `-C` flag.
10213 * Linking against outdated crates now has improved error messages.
10214 * Error messages with lifetimes will often suggest how to annotate the
10215 function to fix the error.
10216 * Many more types are documented in the standard library, and new guides
10218 * Many `rustdoc` improvements:
10219 * code blocks are syntax highlighted.
10220 * render standalone markdown files.
10221 * the --test flag tests all code blocks by default.
10222 * exported macros are displayed.
10223 * re-exported types have their documentation inlined at the location of the
10225 * search works across crates that have been rendered to the same output
10229 Version 0.9 (2014-01-09)
10230 ==========================
10232 * ~1800 changes, numerous bugfixes
10235 * The `float` type has been removed. Use `f32` or `f64` instead.
10236 * A new facility for enabling experimental features (feature gating) has
10237 been added, using the crate-level `#[feature(foo)]` attribute.
10238 * Managed boxes (@) are now behind a feature gate
10239 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10240 standard library's `Gc` or `Rc` types instead.
10241 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10242 * Jumping back to the top of a loop is now done with `continue` instead of
10244 * Strings can no longer be mutated through index assignment.
10245 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10246 hash delimiters, as in `r###"foo"###`.
10247 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10249 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10250 * `@fn`s have been removed.
10251 * `do` only works with procs in order to make it obvious what the cost
10253 * Single-element tuple-like structs can no longer be dereferenced to
10254 obtain the inner value. A more comprehensive solution for overloading
10255 the dereference operator will be provided in the future.
10256 * The `#[link(...)]` attribute has been replaced with
10257 `#[crate_id = "name#vers"]`.
10258 * Empty `impl`s must be terminated with empty braces and may not be
10259 terminated with a semicolon.
10260 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10261 no longer has any special meaning.
10262 * The old `fmt!` string formatting macro has been removed.
10263 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10264 `print!` and `println!`.
10265 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10266 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10267 `extern mod foo = "bar"` instead.
10268 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10269 * Macros can have attributes.
10270 * Macros can expand to items with attributes.
10271 * Macros can expand to multiple items.
10272 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10273 * Comments may be nested.
10274 * Values automatically coerce to trait objects they implement, without
10276 * Enum discriminants are no longer an entire word but as small as needed to
10277 contain all the variants. The `repr` attribute can be used to override
10278 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10279 `#[repr(C)]` to match C enums.
10280 * Non-string literals are not allowed in attributes (they never worked).
10281 * The FFI now supports variadic functions.
10282 * Octal numeric literals, as in `0o7777`.
10283 * The `concat!` syntax extension performs compile-time string concatenation.
10284 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10285 removed as Rust no longer uses segmented stacks.
10286 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10287 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10288 not `*`; ignoring remaining fields of a struct is also done with `..`,
10289 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10290 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10291 * `rustc` supports the "system" calling convention, which defaults to the
10292 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10294 * The `type_overflow` lint (default: warn) checks literals for overflow.
10295 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10296 * The `attribute_usage` lint (default: warn) warns about unknown
10298 * The `unknown_features` lint (default: warn) warns about unknown
10300 * The `dead_code` lint (default: warn) checks for dead code.
10301 * Rust libraries can be linked statically to one another
10302 * `#[link_args]` is behind the `link_args` feature gate.
10303 * Native libraries are now linked with `#[link(name = "foo")]`
10304 * Native libraries can be statically linked to a rust crate
10305 (`#[link(name = "foo", kind = "static")]`).
10306 * Native OS X frameworks are now officially supported
10307 (`#[link(name = "foo", kind = "framework")]`).
10308 * The `#[thread_local]` attribute creates thread-local (not task-local)
10309 variables. Currently behind the `thread_local` feature gate.
10310 * The `return` keyword may be used in closures.
10311 * Types that can be copied via a memcpy implement the `Pod` kind.
10312 * The `cfg` attribute can now be used on struct fields and enum variants.
10315 * std: The `option` and `result` API's have been overhauled to make them
10316 simpler, more consistent, and more composable.
10317 * std: The entire `std::io` module has been replaced with one that is
10318 more comprehensive and that properly interfaces with the underlying
10319 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10321 * std: `io::util` contains a number of useful implementations of
10322 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10323 `ZeroReader`, `TeeReader`.
10324 * std: The reference counted pointer type `extra::rc` moved into std.
10325 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10326 just a wrapper around it).
10327 * std: The `Either` type has been removed.
10328 * std: `fmt::Default` can be implemented for any type to provide default
10329 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10330 * std: The `rand` API continues to be tweaked.
10331 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10332 on failure in gdb, is now named `rust_fail`.
10333 * std: The `each_key` and `each_value` methods on `HashMap` have been
10334 replaced by the `keys` and `values` iterators.
10335 * std: Functions dealing with type size and alignment have moved from the
10336 `sys` module to the `mem` module.
10337 * std: The `path` module was written and API changed.
10338 * std: `str::from_utf8` has been changed to cast instead of allocate.
10339 * std: `starts_with` and `ends_with` methods added to vectors via the
10340 `ImmutableEqVector` trait, which is in the prelude.
10341 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10342 if the index is out of bounds.
10343 * std: Task failure no longer propagates between tasks, as the model was
10344 complex, expensive, and incompatible with thread-based tasks.
10345 * std: The `Any` type can be used for dynamic typing.
10346 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10348 * std: Methods that produce iterators generally do not have an `_iter`
10350 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10351 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10352 * std: `util::ignore` renamed to `prelude::drop`.
10353 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10355 * std: `vec::raw` has seen a lot of cleanup and API changes.
10356 * std: The standard library no longer includes any C++ code, and very
10357 minimal C, eliminating the dependency on libstdc++.
10358 * std: Runtime scheduling and I/O functionality has been factored out into
10359 extensible interfaces and is now implemented by two different crates:
10360 libnative, for native threading and I/O; and libgreen, for green threading
10361 and I/O. This paves the way for using the standard library in more limited
10362 embedded environments.
10363 * std: The `comm` module has been rewritten to be much faster, have a
10364 simpler, more consistent API, and to work for both native and green
10366 * std: All libuv dependencies have been moved into the rustuv crate.
10367 * native: New implementations of runtime scheduling on top of OS threads.
10368 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10370 * green: The green thread scheduler and message passing types are almost
10371 entirely lock-free.
10372 * extra: The `flatpipes` module had bitrotted and was removed.
10373 * extra: All crypto functions have been removed and Rust now has a policy of
10374 not reimplementing crypto in the standard library. In the future crypto
10375 will be provided by external crates with bindings to established libraries.
10376 * extra: `c_vec` has been modernized.
10377 * extra: The `sort` module has been removed. Use the `sort` method on
10381 * The `rust` and `rusti` commands have been removed, due to lack of
10383 * `rustdoc` was completely rewritten.
10384 * `rustdoc` can test code examples in documentation.
10385 * `rustpkg` can test packages with the argument, 'test'.
10386 * `rustpkg` supports arbitrary dependencies, including C libraries.
10387 * `rustc`'s support for generating debug info is improved again.
10388 * `rustc` has better error reporting for unbalanced delimiters.
10389 * `rustc`'s JIT support was removed due to bitrot.
10390 * Executables and static libraries can be built with LTO (-Z lto)
10391 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10395 Version 0.8 (2013-09-26)
10396 ============================
10398 * ~2200 changes, numerous bugfixes
10401 * The `for` loop syntax has changed to work with the `Iterator` trait.
10402 * At long last, unwinding works on Windows.
10403 * Default methods are ready for use.
10404 * Many trait inheritance bugs fixed.
10405 * Owned and borrowed trait objects work more reliably.
10406 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10407 * rustc can omit emission of code for the `debug!` macro if it is passed
10409 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10410 for foo.rs, then foo/mod.rs, and will generate an error when both are
10412 * Strings no longer contain trailing nulls. The new `std::c_str` module
10413 provides new mechanisms for converting to C strings.
10414 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10415 * The FFI has been overhauled such that foreign functions are called directly,
10416 instead of through a stack-switching wrapper.
10417 * Calling a foreign function must be done through a Rust function with the
10418 `#[fixed_stack_segment]` attribute.
10419 * The `externfn!` macro can be used to declare both a foreign function and
10420 a `#[fixed_stack_segment]` wrapper at once.
10421 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10422 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10423 * `priv` is disallowed everywhere except for struct fields and enum variants.
10424 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10425 * `ref` bindings in irrefutable patterns work correctly now.
10426 * `char` is now prevented from containing invalid code points.
10427 * Casting to `bool` is no longer allowed.
10428 * `\0` is now accepted as an escape in chars and strings.
10429 * `yield` is a reserved keyword.
10430 * `typeof` is a reserved keyword.
10431 * Crates may be imported by URL with `extern mod foo = "url";`.
10432 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10433 * Static vectors can be initialized with repeating elements,
10434 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10435 * Static structs can be initialized with functional record update,
10436 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10437 * `cfg!` can be used to conditionally execute code based on the crate
10438 configuration, similarly to `#[cfg(...)]`.
10439 * The `unnecessary_qualification` lint detects unneeded module
10440 prefixes (default: allow).
10441 * Arithmetic operations have been implemented on the SIMD types in
10442 `std::unstable::simd`.
10443 * Exchange allocation headers were removed, reducing memory usage.
10444 * `format!` implements a completely new, extensible, and higher-performance
10445 string formatting system. It will replace `fmt!`.
10446 * `print!` and `println!` write formatted strings (using the `format!`
10447 extension) to stdout.
10448 * `write!` and `writeln!` write formatted strings (using the `format!`
10449 extension) to the new Writers in `std::rt::io`.
10450 * The library section in which a function or static is placed may
10451 be specified with `#[link_section = "..."]`.
10452 * The `proto!` syntax extension for defining bounded message protocols
10454 * `macro_rules!` is hygienic for `let` declarations.
10455 * The `#[export_name]` attribute specifies the name of a symbol.
10456 * `unreachable!` can be used to indicate unreachable code, and fails
10460 * std: Transitioned to the new runtime, written in Rust.
10461 * std: Added an experimental I/O library, `rt::io`, based on the new
10463 * std: A new generic `range` function was added to the prelude, replacing
10464 `uint::range` and friends.
10465 * std: `range_rev` no longer exists. Since range is an iterator it can be
10466 reversed with `range(lo, hi).invert()`.
10467 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10468 renamed to `unwrap_or`.
10469 * std: The `iterator` module was renamed to `iter`.
10470 * std: Integral types now support the `checked_add`, `checked_sub`, and
10471 `checked_mul` operations for detecting overflow.
10472 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10474 * std: Methods are standardizing on conventions for casting methods:
10475 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10477 * std: The `CString` type in `c_str` provides new ways to convert to and
10479 * std: `DoubleEndedIterator` can yield elements in two directions.
10480 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10482 * std: `str::from_bytes` renamed to `str::from_utf8`.
10483 * std: `pop_opt` and `shift_opt` methods added to vectors.
10484 * std: The task-local data interface no longer uses @, and keys are
10485 no longer function pointers.
10486 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10487 * std: Added `SharedPort` to `comm`.
10488 * std: `Eq` has a default method for `ne`; only `eq` is required
10489 in implementations.
10490 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10491 is required in implementations.
10492 * std: `is_utf8` performance is improved, impacting many string functions.
10493 * std: `os::MemoryMap` provides cross-platform mmap.
10494 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10495 are not 'in-bounds' are considered undefined.
10496 * std: Many freestanding functions in `vec` removed in favor of methods.
10497 * std: Many freestanding functions on scalar types removed in favor of
10499 * std: Many options to task builders were removed since they don't make
10500 sense in the new scheduler design.
10501 * std: More containers implement `FromIterator` so can be created by the
10503 * std: More complete atomic types in `unstable::atomics`.
10504 * std: `comm::PortSet` removed.
10505 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10506 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10507 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10508 default implementations.
10509 * std: Various `from_str` functions were removed in favor of a generic
10510 `from_str` which is available in the prelude.
10511 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10512 * extra: `dlist`, the doubly-linked list was modernized.
10513 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10514 * extra: Added `glob` module, replacing `std::os::glob`.
10515 * extra: `rope` was removed.
10516 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10517 * extra: `net`, and `timer` were removed. The experimental replacements
10518 are `std::rt::io::net` and `std::rt::io::timer`.
10519 * extra: Iterators implemented for `SmallIntMap`.
10520 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10521 * extra: `SmallIntSet` removed. Use `BitvSet`.
10522 * extra: Performance of JSON parsing greatly improved.
10523 * extra: `semver` updated to SemVer 2.0.0.
10524 * extra: `term` handles more terminals correctly.
10525 * extra: `dbg` module removed.
10526 * extra: `par` module removed.
10527 * extra: `future` was cleaned up, with some method renames.
10528 * extra: Most free functions in `getopts` were converted to methods.
10531 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10532 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10533 similarly to gcc's `--march` flag.
10534 * rustc's performance compiling small crates is much better.
10535 * rustpkg has received many improvements.
10536 * rustpkg supports git tags as package IDs.
10537 * rustpkg builds into target-specific directories so it can be used for
10539 * The number of concurrent test tasks is controlled by the environment
10540 variable RUST_TEST_TASKS.
10541 * The test harness can now report metrics for benchmarks.
10542 * All tools have man pages.
10543 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10544 * The runtime uses jemalloc for allocations.
10545 * Segmented stacks are temporarily disabled as part of the transition to
10546 the new runtime. Stack overflows are possible!
10547 * A new documentation backend, rustdoc_ng, is available for use. It is
10548 still invoked through the normal `rustdoc` command.
10551 Version 0.7 (2013-07-03)
10552 =======================
10554 * ~2000 changes, numerous bugfixes
10557 * `impl`s no longer accept a visibility qualifier. Put them on methods
10559 * The borrow checker has been rewritten with flow-sensitivity, fixing
10560 many bugs and inconveniences.
10561 * The `self` parameter no longer implicitly means `&'self self`,
10562 and can be explicitly marked with a lifetime.
10563 * Overloadable compound operators (`+=`, etc.) have been temporarily
10564 removed due to bugs.
10565 * The `for` loop protocol now requires `for`-iterators to return `bool`
10566 so they compose better.
10567 * The `Durable` trait is replaced with the `'static` bounds.
10568 * Trait default methods work more often.
10569 * Structs with the `#[packed]` attribute have byte alignment and
10570 no padding between fields.
10571 * Type parameters bound by `Copy` must now be copied explicitly with
10572 the `copy` keyword.
10573 * It is now illegal to move out of a dereferenced unsafe pointer.
10574 * `Option<~T>` is now represented as a nullable pointer.
10575 * `@mut` does dynamic borrow checks correctly.
10576 * The `main` function is only detected at the topmost level of the crate.
10577 The `#[main]` attribute is still valid anywhere.
10578 * Struct fields may no longer be mutable. Use inherited mutability.
10579 * The `#[no_send]` attribute makes a type that would otherwise be
10581 * The `#[no_freeze]` attribute makes a type that would otherwise be
10583 * Unbounded recursion will abort the process after reaching the limit
10584 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10585 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10586 are never implicitly copyable.
10587 * `#[static_assert]` makes compile-time assertions about static bools.
10588 * At long last, 'argument modes' no longer exist.
10589 * The rarely used `use mod` statement no longer exists.
10591 * Syntax extensions
10592 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10594 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10595 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10596 `#[deriving(...)]`.
10597 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10598 and unsuffixed integer literals.
10601 * The `core` crate was renamed to `std`.
10602 * The `std` crate was renamed to `extra`.
10603 * More and improved documentation.
10604 * std: `iterator` module for external iterator objects.
10605 * Many old-style (internal, higher-order function) iterators replaced by
10606 implementations of `Iterator`.
10607 * std: Many old internal vector and string iterators,
10608 incl. `any`, `all`. removed.
10609 * std: The `finalize` method of `Drop` renamed to `drop`.
10610 * std: The `drop` method now takes `&mut self` instead of `&self`.
10611 * std: The prelude no longer re-exports any modules, only types and traits.
10612 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10613 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10614 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10615 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10616 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10617 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10618 * std: Many types implement `Clone`.
10619 * std: `path` type renamed to `Path`.
10620 * std: `mut` module and `Mut` type removed.
10621 * std: Many standalone functions removed in favor of methods and iterators
10622 in `vec`, `str`. In the future methods will also work as functions.
10623 * std: `reinterpret_cast` removed. Use `transmute`.
10624 * std: ascii string handling in `std::ascii`.
10625 * std: `Rand` is implemented for ~/@.
10626 * std: `run` module for spawning processes overhauled.
10627 * std: Various atomic types added to `unstable::atomic`.
10628 * std: Various types implement `Zero`.
10629 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10630 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10631 * std: Added `os::mkdir_recursive`.
10632 * std: Added `os::glob` function performs filesystems globs.
10633 * std: `FuzzyEq` renamed to `ApproxEq`.
10634 * std: `Map` now defines `pop` and `swap` methods.
10635 * std: `Cell` constructors converted to static methods.
10636 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10637 * extra: `flate` module moved from `std` to `extra`.
10638 * extra: `fileinput` module for iterating over a series of files.
10639 * extra: `Complex` number type and `complex` module.
10640 * extra: `Rational` number type and `rational` module.
10641 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10642 * extra: `term` uses terminfo now, is more correct.
10643 * extra: `arc` functions converted to methods.
10644 * extra: Implementation of fixed output size variations of SHA-2.
10647 * `unused_variables` lint mode for unused variables (default: warn).
10648 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10650 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10652 * `dead_assignment` lint mode for unread variables (default: warn).
10653 * `unnecessary_allocation` lint mode detects some heap allocations that are
10654 immediately borrowed so could be written without allocating (default: warn).
10655 * `missing_doc` lint mode (default: allow).
10656 * `unreachable_code` lint mode (default: warn).
10657 * The `rusti` command has been rewritten and a number of bugs addressed.
10658 * rustc outputs in color on more terminals.
10659 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10660 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10661 * Compiling with `-g` will make the binary record information about
10662 dynamic borrowcheck failures for debugging.
10663 * rustdoc has a nicer stylesheet.
10664 * Various improvements to rustdoc.
10665 * Improvements to rustpkg (see the detailed release notes).
10668 Version 0.6 (2013-04-03)
10669 ========================
10671 * ~2100 changes, numerous bugfixes
10674 * The self type parameter in traits is now spelled `Self`
10675 * The `self` parameter in trait and impl methods must now be explicitly
10676 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10677 * Static methods no longer require the `static` keyword and instead
10678 are distinguished by the lack of a `self` parameter
10679 * Replaced the `Durable` trait with the `'static` lifetime
10680 * The old closure type syntax with the trailing sigil has been
10681 removed in favor of the more consistent leading sigil
10682 * `super` is a keyword, and may be prefixed to paths
10683 * Trait bounds are separated with `+` instead of whitespace
10684 * Traits are implemented with `impl Trait for Type`
10685 instead of `impl Type: Trait`
10686 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10687 * The `export` keyword has finally been removed
10688 * The `move` keyword has been removed (see "Semantic changes")
10689 * The interior mutability qualifier on vectors, `[mut T]`, has been
10690 removed. Use `&mut [T]`, etc.
10691 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10692 * `fail` is no longer a keyword. Use `fail!()`
10693 * `assert` is no longer a keyword. Use `assert!()`
10694 * `log` is no longer a keyword. use `debug!`, etc.
10695 * 1-tuples may be represented as `(T,)`
10696 * Struct fields may no longer be `mut`. Use inherited mutability,
10697 `@mut T`, `core::mut` or `core::cell`
10698 * `extern mod { ... }` is no longer valid syntax for foreign
10699 function modules. Use extern blocks: `extern { ... }`
10700 * Newtype enums removed. Use tuple-structs.
10701 * Trait implementations no longer support visibility modifiers
10702 * Pattern matching over vectors improved and expanded
10703 * `const` renamed to `static` to correspond to lifetime name,
10704 and make room for future `static mut` unsafe mutable globals.
10705 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10706 * `Clone` implementations can be automatically generated with
10707 `#[deriving(Clone)]`
10708 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10709 instead of `foo as Bar`.
10710 * Fixed length vector types are now written as `[int, .. 3]`
10711 instead of `[int * 3]`.
10712 * Fixed length vector types can express the length as a constant
10713 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10716 * Types with owned pointers or custom destructors move by default,
10717 eliminating the `move` keyword
10718 * All foreign functions are considered unsafe
10719 * &mut is now unaliasable
10720 * Writes to borrowed @mut pointers are prevented dynamically
10722 * The name of the main function can be customized using #[main]
10723 * The default type of an inferred closure is &fn instead of @fn
10724 * `use` statements may no longer be "chained" - they cannot import
10725 identifiers imported by previous `use` statements
10726 * `use` statements are crate relative, importing from the "top"
10727 of the crate by default. Paths may be prefixed with `super::`
10728 or `self::` to change the search behavior.
10729 * Method visibility is inherited from the implementation declaration
10730 * Structural records have been removed
10731 * Many more types can be used in static items, including enums
10732 'static-lifetime pointers and vectors
10733 * Pattern matching over vectors improved and expanded
10734 * Typechecking of closure types has been overhauled to
10735 improve inference and eliminate unsoundness
10736 * Macros leave scope at the end of modules, unless that module is
10737 tagged with #[macro_escape]
10740 * Added big integers to `std::bigint`
10741 * Removed `core::oldcomm` module
10742 * Added pipe-based `core::comm` module
10743 * Numeric traits have been reorganized under `core::num`
10744 * `vec::slice` finally returns a slice
10745 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10746 * Containers reorganized around traits in `core::container`
10747 * `core::dvec` removed, `~[T]` is a drop-in replacement
10748 * `core::send_map` renamed to `core::hashmap`
10749 * `std::map` removed; replaced with `core::hashmap`
10750 * `std::treemap` reimplemented as an owned balanced tree
10751 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10752 * `core::trie` added as a fast ordered map for integer keys
10753 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10754 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10755 overload the comparison operators, whereas `TotalOrd` is used
10756 by certain container types
10759 * Replaced the 'cargo' package manager with 'rustpkg'
10760 * Added all-purpose 'rust' tool
10761 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10762 * rustc now *attempts* to offer spelling suggestions
10763 * Improved support for ARM and Android
10764 * Preliminary MIPS backend
10765 * Improved foreign function ABI implementation for x86, x86_64
10766 * Various memory usage improvements
10767 * Rust code may be embedded in foreign code under limited circumstances
10768 * Inline assembler supported by new asm!() syntax extension.
10771 Version 0.5 (2012-12-21)
10772 ===========================
10774 * ~900 changes, numerous bugfixes
10777 * Removed `<-` move operator
10778 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10779 * Removed old fixed length vector syntax - `[T]/N`
10780 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10781 * Macros may now expand to items and statements
10782 * `a.b()` is always parsed as a method call, never as a field projection
10783 * `Eq` and `IterBytes` implementations can be automatically generated
10784 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10785 * Removed the special crate language for `.rc` files
10786 * Function arguments may consist of any irrefutable pattern
10789 * `&` and `~` pointers may point to objects
10790 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10791 * Enum variants may be structs
10792 * Destructors can be added to all nominal types with the Drop trait
10793 * Structs and nullary enum variants may be constants
10794 * Values that cannot be implicitly copied are now automatically moved
10795 without writing `move` explicitly
10796 * `&T` may now be coerced to `*T`
10797 * Coercions happen in `let` statements as well as function calls
10798 * `use` statements now take crate-relative paths
10799 * The module and type namespaces have been merged so that static
10800 method names can be resolved under the trait in which they are
10803 * Improved support for language features
10804 * Trait inheritance works in many scenarios
10805 * More support for explicit self arguments in methods - `self`, `&self`
10806 `@self`, and `~self` all generally work as expected
10807 * Static methods work in more situations
10808 * Experimental: Traits may declare default methods for the implementations
10812 * New condition handling system in `core::condition`
10813 * Timsort added to `std::sort`
10814 * New priority queue, `std::priority_queue`
10815 * Pipes for serializable types, `std::flatpipes'
10816 * Serialization overhauled to be trait-based
10817 * Expanded `getopts` definitions
10818 * Moved futures to `std`
10819 * More functions are pure now
10820 * `core::comm` renamed to `oldcomm`. Still deprecated
10821 * `rustdoc` and `cargo` are libraries now
10824 * Added a preliminary REPL, `rusti`
10825 * License changed from MIT to dual MIT/APL2
10828 Version 0.4 (2012-10-15)
10829 ==========================
10831 * ~2000 changes, numerous bugfixes
10834 * All keywords are now strict and may not be used as identifiers anywhere
10835 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10836 'of', 'with', 'to', 'class'.
10837 * Classes are replaced with simpler structs
10838 * Explicit method self types
10839 * `ret` became `return` and `alt` became `match`
10840 * `import` is now `use`; `use is now `extern mod`
10841 * `extern mod { ... }` is now `extern { ... }`
10842 * `use mod` is the recommended way to import modules
10843 * `pub` and `priv` replace deprecated export lists
10844 * The syntax of `match` pattern arms now uses fat arrow (=>)
10845 * `main` no longer accepts an args vector; use `os::args` instead
10848 * Trait implementations are now coherent, ala Haskell typeclasses
10849 * Trait methods may be static
10850 * Argument modes are deprecated
10851 * Borrowed pointers are much more mature and recommended for use
10852 * Strings and vectors in the static region are stored in constant memory
10853 * Typestate was removed
10854 * Resolution rewritten to be more reliable
10855 * Support for 'dual-mode' data structures (freezing and thawing)
10858 * Most binary operators can now be overloaded via the traits in
10860 * `std::net::url` for representing URLs
10861 * Sendable hash maps in `core::send_map`
10862 * `core::task' gained a (currently unsafe) task-local storage API
10865 * An efficient new intertask communication primitive called the pipe,
10866 along with a number of higher-level channel types, in `core::pipes`
10867 * `std::arc`, an atomically reference counted, immutable, shared memory
10869 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10870 * Futures are now based on pipes and sendable
10871 * More robust linked task failure
10872 * Improved task builder API
10875 * Improved error reporting
10876 * Preliminary JIT support
10877 * Preliminary work on precise GC
10878 * Extensive architectural improvements to rustc
10879 * Begun a transition away from buggy C++-based reflection (shape) code to
10880 Rust-based (visitor) code
10881 * All hash functions and tables converted to secure, randomized SipHash
10884 Version 0.3 (2012-07-12)
10885 ========================
10887 * ~1900 changes, numerous bugfixes
10889 * New coding conveniences
10890 * Integer-literal suffix inference
10891 * Per-item control over warnings, errors
10892 * #[cfg(windows)] and #[cfg(unix)] attributes
10893 * Documentation comments
10894 * More compact closure syntax
10895 * 'do' expressions for treating higher-order functions as
10897 * *-patterns (wildcard extended to all constructor fields)
10900 * Name resolution pass and exhaustiveness checker rewritten
10901 * Region pointers and borrow checking supersede alias
10903 * Init-ness checking is now provided by a region-based liveness
10904 pass instead of the typestate pass; same for last-use analysis
10905 * Extensive work on region pointers
10907 * Experimental new language features
10908 * Slices and fixed-size, interior-allocated vectors
10909 * #!-comments for lang versioning, shell execution
10910 * Destructors and iface implementation for classes;
10911 type-parameterized classes and class methods
10912 * 'const' type kind for types that can be used to implement
10913 shared-memory concurrency patterns
10917 * Removal of various obsolete features
10918 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10919 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10921 * Constructs: do-while loops ('do' repurposed), fn binding,
10922 resources (replaced by destructors)
10924 * Compiler reorganization
10925 * Syntax-layer of compiler split into separate crate
10926 * Clang (from LLVM project) integrated into build
10927 * Typechecker split into sub-modules
10930 * New time functions
10931 * Extension methods for many built-in types
10932 * Arc: atomic-refcount read-only / exclusive-use shared cells
10933 * Par: parallel map and search routines
10934 * Extensive work on libuv interface
10935 * Much vector code moved to libraries
10936 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10937 #include, #include_str, #include_bin
10939 * Tool improvements
10940 * Cargo automatically resolves dependencies
10943 Version 0.2 (2012-03-29)
10944 =========================
10946 * >1500 changes, numerous bugfixes
10948 * New docs and doc tooling
10950 * New port: FreeBSD x86_64
10952 * Compilation model enhancements
10953 * Generics now specialized, multiply instantiated
10954 * Functions now inlined across separate crates
10956 * Scheduling, stack and threading fixes
10957 * Noticeably improved message-passing performance
10958 * Explicit schedulers
10962 * Experimental new language features
10963 * Operator overloading
10967 * Various language extensions
10968 * C-callback function types: 'crust fn ...'
10969 * Infinite-loop construct: 'loop { ... }'
10970 * Shorten 'mutable' to 'mut'
10971 * Required mutable-local qualifier: 'let mut ...'
10972 * Basic glob-exporting: 'export foo::*;'
10973 * Alt now exhaustive, 'alt check' for runtime-checked
10974 * Block-function form of 'for' loop, with 'break' and 'ret'.
10977 * AST quasi-quote syntax extension
10978 * Revived libuv interface
10979 * New modules: core::{future, iter}, std::arena
10980 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10981 * Extensive cleanup, regularization in libstd, libcore
10984 Version 0.1 (2012-01-20)
10985 ===============================
10987 * Most language features work, including:
10988 * Unique pointers, unique closures, move semantics
10989 * Interface-constrained generics
10990 * Static interface dispatch
10992 * Multithread task scheduling
10993 * Typestate predicates
10994 * Failure unwinding, destructors
10995 * Pattern matching and destructuring assignment
10996 * Lightweight block-lambda syntax
10997 * Preliminary macro-by-example
10999 * Compiler works with the following configurations:
11000 * Linux: x86 and x86_64 hosts and targets
11001 * macOS: x86 and x86_64 hosts and targets
11002 * Windows: x86 hosts and targets
11004 * Cross compilation / multi-target configuration supported.
11006 * Preliminary API-documentation and package-management tools included.
11010 * Documentation is incomplete.
11012 * Performance is below intended target.
11014 * Standard library APIs are subject to extensive change, reorganization.
11016 * Language-level versioning is not yet operational - future code will
11017 break unexpectedly.