1 Version 1.58.0 (2022-01-13)
2 ==========================
7 - [Format strings can now capture arguments simply by writing `{ident}` in the string.][90473] This works in all macros accepting format strings. Support for this in `panic!` (`panic!("{ident}")`) requires the 2021 edition; panic invocations in previous editions that appear to be trying to use this will result in a warning lint about not having the intended effect.
8 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
9 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
14 - [Add LLVM CFI support to the Rust compiler][89652]
15 - [Stabilize -Z strip as -C strip][90058]. Note that while release builds already don't add debug symbols for the code you compile, the compiled standard library that ships with Rust includes debug symbols, so you may want to use the `strip` option to remove these symbols to produce smaller release binaries. Note that this release only includes support in rustc, not directly in cargo.
16 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
17 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
18 - [Update the minimum external LLVM to 12][90175]
19 - [Add `x86_64-unknown-none` at Tier 3*][89062]
20 - [Build musl dist artifacts with debuginfo enabled][90733]. When building release binaries using musl, you may want to use the newly stabilized strip option to remove these debug symbols, reducing the size of your binaries.
21 - [Don't abort compilation after giving a lint error][87337]
22 - [Error messages point at the source of trait bound obligations in more places][89580]
24 \* Refer to Rust's [platform support page][platform-support-doc] for more
25 information on Rust's tiered platform support.
30 - [All remaining functions in the standard library have `#[must_use]` annotations where appropriate][89692], producing a warning when ignoring their return value. This helps catch mistakes such as expecting a function to mutate a value in place rather than return a new value.
31 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
32 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
33 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
34 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
35 - [Implement `Termination` for `Result<Infallible, E>`][88601]. This allows writing `fn main() -> Result<Infallible, ErrorType>`, for a program whose successful exits never involve returning from `main` (for instance, a program that calls `exit`, or that uses `exec` to run another program).
40 - [`Metadata::is_symlink`]
41 - [`Path::is_symlink`]
42 - [`{integer}::saturating_div`]
43 - [`Option::unwrap_unchecked`]
44 - [`Result::unwrap_unchecked`]
45 - [`Result::unwrap_err_unchecked`]
48 These APIs are now usable in const contexts:
51 - [`Duration::checked_add`]
52 - [`Duration::saturating_add`]
53 - [`Duration::checked_sub`]
54 - [`Duration::saturating_sub`]
55 - [`Duration::checked_mul`]
56 - [`Duration::saturating_mul`]
57 - [`Duration::checked_div`]
62 - [Add --message-format for install command][cargo/10107]
63 - [Warn when alias shadows external subcommand][cargo/10082]
68 - [Show all Deref implementations recursively in rustdoc][90183]
69 - [Use computed visibility in rustdoc][88447]
74 - [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.
75 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
76 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
77 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
78 - [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.
79 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
84 These changes provide no direct user facing benefits, but represent significant
85 improvements to the internals and overall performance of rustc
88 - [Implement coherence checks for negative trait impls][90104]
89 - [Add rustc lint, warning when iterating over hashmaps][89558]
90 - [Optimize live point computation][90491]
91 - [Enable verification for 1/32nd of queries loaded from disk][90361]
92 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
94 [87337]: https://github.com/rust-lang/rust/pull/87337/
95 [87467]: https://github.com/rust-lang/rust/pull/87467/
96 [87704]: https://github.com/rust-lang/rust/pull/87704/
97 [88041]: https://github.com/rust-lang/rust/pull/88041/
98 [88447]: https://github.com/rust-lang/rust/pull/88447/
99 [88601]: https://github.com/rust-lang/rust/pull/88601/
100 [89062]: https://github.com/rust-lang/rust/pull/89062/
101 [89174]: https://github.com/rust-lang/rust/pull/89174/
102 [89551]: https://github.com/rust-lang/rust/pull/89551/
103 [89558]: https://github.com/rust-lang/rust/pull/89558/
104 [89580]: https://github.com/rust-lang/rust/pull/89580/
105 [89652]: https://github.com/rust-lang/rust/pull/89652/
106 [90041]: https://github.com/rust-lang/rust/pull/90041/
107 [90058]: https://github.com/rust-lang/rust/pull/90058/
108 [90104]: https://github.com/rust-lang/rust/pull/90104/
109 [90117]: https://github.com/rust-lang/rust/pull/90117/
110 [90175]: https://github.com/rust-lang/rust/pull/90175/
111 [90183]: https://github.com/rust-lang/rust/pull/90183/
112 [90297]: https://github.com/rust-lang/rust/pull/90297/
113 [90329]: https://github.com/rust-lang/rust/pull/90329/
114 [90361]: https://github.com/rust-lang/rust/pull/90361/
115 [90417]: https://github.com/rust-lang/rust/pull/90417/
116 [90473]: https://github.com/rust-lang/rust/pull/90473/
117 [90491]: https://github.com/rust-lang/rust/pull/90491/
118 [90733]: https://github.com/rust-lang/rust/pull/90733/
119 [90833]: https://github.com/rust-lang/rust/pull/90833/
120 [90846]: https://github.com/rust-lang/rust/pull/90846/
121 [91026]: https://github.com/rust-lang/rust/pull/91026/
122 [91207]: https://github.com/rust-lang/rust/pull/91207/
123 [91255]: https://github.com/rust-lang/rust/pull/91255/
124 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
125 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
126 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
127 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
128 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
129 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
130 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
131 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
132 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
133 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
135 Version 1.57.0 (2021-12-02)
136 ==========================
141 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
142 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
143 - [Allow panicking in constant evaluation.][89508]
148 - [Create more accurate debuginfo for vtables.][89597]
149 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
150 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
151 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
152 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
154 \* Refer to Rust's [platform support page][platform-support-doc] for more
155 information on Rust's tiered platform support.
160 - [Avoid allocations and copying in `Vec::leak`][89337]
161 - [Add `#[repr(i8)]` to `Ordering`][89507]
162 - [Optimize `File::read_to_end` and `read_to_string`][89582]
163 - [Update to Unicode 14.0][89614]
164 - [Many more functions are marked `#[must_use]`][89692], producing a warning
165 when ignoring their return value. This helps catch mistakes such as expecting
166 a function to mutate a value in place rather than return a new value.
171 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
172 - [`[T; N]::as_slice`][`array::as_slice`]
173 - [`collections::TryReserveError`]
174 - [`HashMap::try_reserve`]
175 - [`HashSet::try_reserve`]
176 - [`String::try_reserve`]
177 - [`String::try_reserve_exact`]
178 - [`Vec::try_reserve`]
179 - [`Vec::try_reserve_exact`]
180 - [`VecDeque::try_reserve`]
181 - [`VecDeque::try_reserve_exact`]
182 - [`Iterator::map_while`]
184 - [`proc_macro::is_available`]
185 - [`Command::get_program`]
186 - [`Command::get_args`]
187 - [`Command::get_envs`]
188 - [`Command::get_current_dir`]
192 These APIs are now usable in const contexts:
194 - [`hint::unreachable_unchecked`]
199 - [Stabilize custom profiles][cargo/9943]
206 These changes provide no direct user facing benefits, but represent significant
207 improvements to the internals and overall performance of rustc
210 - [Added an experimental backend for codegen with `libgccjit`.][87260]
212 [86191]: https://github.com/rust-lang/rust/pull/86191/
213 [87220]: https://github.com/rust-lang/rust/pull/87220/
214 [87260]: https://github.com/rust-lang/rust/pull/87260/
215 [88321]: https://github.com/rust-lang/rust/pull/88321/
216 [88529]: https://github.com/rust-lang/rust/pull/88529/
217 [88690]: https://github.com/rust-lang/rust/pull/88690/
218 [88952]: https://github.com/rust-lang/rust/pull/88952/
219 [89337]: https://github.com/rust-lang/rust/pull/89337/
220 [89507]: https://github.com/rust-lang/rust/pull/89507/
221 [89508]: https://github.com/rust-lang/rust/pull/89508/
222 [89582]: https://github.com/rust-lang/rust/pull/89582/
223 [89597]: https://github.com/rust-lang/rust/pull/89597/
224 [89614]: https://github.com/rust-lang/rust/pull/89614/
225 [89692]: https://github.com/rust-lang/rust/issues/89692/
226 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
227 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
228 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
229 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
230 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
231 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
232 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
233 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
234 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
235 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
236 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
237 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
238 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
239 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
240 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
241 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
242 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
243 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
244 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
245 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
246 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
248 Version 1.56.1 (2021-11-01)
249 ===========================
251 - New lints to detect the presence of bidirectional-override Unicode
252 codepoints in the compiled source code ([CVE-2021-42574])
254 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
256 Version 1.56.0 (2021-10-21)
257 ========================
262 - [The 2021 Edition is now stable.][rust#88100]
263 See [the edition guide][rust-2021-edition-guide] for more details.
264 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
265 - [Union field access is permitted in `const fn`.][rust#85769]
267 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
272 - [Upgrade to LLVM 13.][rust#87570]
273 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
274 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
275 - [Warnings can be forced on with `--force-warn`.][rust#87472]
276 This feature is primarily intended for usage by `cargo fix`, rather than end users.
277 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
278 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
279 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
281 \* Refer to Rust's [platform support page][platform-support-doc] for more
282 information on Rust's tiered platform support.
287 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
288 The Windows console still requires valid Unicode, but this change allows
289 splitting a UTF-8 character across multiple write calls. This allows, for
290 instance, programs that just read and write data buffers (e.g. copying a file
291 to stdout) without regard for Unicode or character boundaries.
292 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
293 For this use case, atomics scale much better under contention.
294 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
295 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
296 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
297 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
298 - [Treat invalid environment variable names as non-existent.][rust#86183]
299 Previously, the environment functions would panic if given a variable name
300 with an internal null character or equal sign (`=`). Now, these functions will
301 just treat such names as non-existent variables, since the OS cannot represent
302 the existence of a variable with such a name.
307 - [`std::os::unix::fs::chroot`]
308 - [`UnsafeCell::raw_get`]
309 - [`BufWriter::into_parts`]
310 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
311 These APIs were previously stable in `std`, but are now also available in `core`.
313 - [`String::shrink_to`]
314 - [`OsString::shrink_to`]
315 - [`PathBuf::shrink_to`]
316 - [`BinaryHeap::shrink_to`]
317 - [`VecDeque::shrink_to`]
318 - [`HashMap::shrink_to`]
319 - [`HashSet::shrink_to`]
321 These APIs are now usable in const contexts:
323 - [`std::mem::transmute`]
324 - [`[T]::first`][`slice::first`]
325 - [`[T]::split_first`][`slice::split_first`]
326 - [`[T]::last`][`slice::last`]
327 - [`[T]::split_last`][`slice::split_last`]
332 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
333 This has no effect at present on dependency version selection.
334 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
335 that support Rust code to include a crate's specified minimum version in the test matrix for that
341 - [Update to new argument parsing rules on Windows.][rust#87580]
342 This adjusts Rust's standard library to match the behavior of the standard
343 libraries for C/C++. The rules have changed slightly over time, and this PR
344 brings us to the latest set of rules (changed in 2008).
345 - [Disallow the aapcs calling convention on aarch64][rust#88399]
346 This was already not supported by LLVM; this change surfaces this lack of
347 support with a better error message.
348 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
349 - [Warn when an escaped newline skips multiple lines.][rust#87671]
350 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
351 may return different values on glibc <= 2.24.][rust#81825]
352 Rust now invokes the `clone3` system call directly, when available, to use new functionality
353 available via that system call. Older versions of glibc cache the result of `getpid`, and only
354 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
355 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
359 These changes provide no direct user facing benefits, but represent significant
360 improvements to the internals and overall performance of rustc
363 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
364 This improves the performance of most Rust builds.
365 - [Unify representation of macros in internal data structures.][rust#88019]
366 This change fixes a host of bugs with the handling of macros by the compiler,
369 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
370 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
371 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
372 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
373 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
374 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
375 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
376 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
377 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
378 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
379 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
380 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
381 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
382 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
383 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
384 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
385 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
386 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
387 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
388 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
389 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
390 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
391 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
392 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
393 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
394 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
395 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
396 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
397 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
398 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
399 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
400 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
401 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
402 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
403 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
404 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
405 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
406 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
407 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
408 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
409 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
410 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
412 Version 1.55.0 (2021-09-09)
413 ============================
417 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
418 will end at the maximum value of the integer.][83918]
419 - [You can now explicitly import the prelude of different editions
420 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
424 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
426 \* Refer to Rust's [platform support page][platform-support-doc] for more
427 information on Rust's tiered platform support.
432 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
433 These improvements should in general provide faster string parsing of floats,
434 no longer reject certain valid floating point values, and reduce
435 the produced code size for non-stripped artifacts.
436 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
443 - [`IntoInnerError::into_error`]
444 - [`IntoInnerError::into_parts`]
445 - [`MaybeUninit::assume_init_mut`]
446 - [`MaybeUninit::assume_init_ref`]
447 - [`MaybeUninit::write`]
449 - [`ops::ControlFlow`]
451 - [`x86::_bittestandcomplement`]
452 - [`x86::_bittestandreset`]
453 - [`x86::_bittestandset`]
454 - [`x86_64::_bittest64`]
455 - [`x86_64::_bittestandcomplement64`]
456 - [`x86_64::_bittestandreset64`]
457 - [`x86_64::_bittestandset64`]
459 The following previously stable functions are now `const`.
461 - [`str::from_utf8_unchecked`]
466 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
467 rustc in parallel such as when using `cargo test`.][cargo/9675]
468 - [The package definition in `cargo metadata` now includes the `"default_run"`
469 field from the manifest.][cargo/9550]
470 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
471 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
472 of packages.][cargo/9663]
476 - [Added "Go to item on exact match" search option.][85876]
477 - [The "Implementors" section on traits no longer shows redundant
478 method definitions.][85970]
479 - [Trait implementations are toggled open by default.][86260] This should make the
480 implementations more searchable by tools like `CTRL+F` in your browser.
481 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
482 through type aliases.][86334]
483 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
484 "Trait Implementations" section.][86513]
489 - [std functions that return an `io::Error` will no longer use the
490 `ErrorKind::Other` variant.][85746] This is to better reflect that these
491 kinds of errors could be categorised [into newer more specific `ErrorKind`
492 variants][79965], and that they do not represent a user error.
493 - [Using environment variable names with `process::Command` on Windows now
494 behaves as expected.][85270] Previously using envionment variables with
495 `Command` would cause them to be ASCII-uppercased.
496 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
497 with `rustdoc::`][86849]
498 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
499 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
500 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
503 [86849]: https://github.com/rust-lang/rust/pull/86849
504 [86513]: https://github.com/rust-lang/rust/pull/86513
505 [86334]: https://github.com/rust-lang/rust/pull/86334
506 [86260]: https://github.com/rust-lang/rust/pull/86260
507 [85970]: https://github.com/rust-lang/rust/pull/85970
508 [85876]: https://github.com/rust-lang/rust/pull/85876
509 [83572]: https://github.com/rust-lang/rust/pull/83572
510 [86294]: https://github.com/rust-lang/rust/pull/86294
511 [86858]: https://github.com/rust-lang/rust/pull/86858
512 [86761]: https://github.com/rust-lang/rust/pull/86761
513 [85746]: https://github.com/rust-lang/rust/pull/85746
514 [85270]: https://github.com/rust-lang/rust/pull/85270
515 [83918]: https://github.com/rust-lang/rust/pull/83918
516 [79965]: https://github.com/rust-lang/rust/pull/79965
517 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
518 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
519 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
520 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
521 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
522 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
523 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
524 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
525 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
526 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
527 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
528 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
529 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
530 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
531 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
532 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
533 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
534 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
535 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
536 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
537 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
538 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
541 Version 1.54.0 (2021-07-29)
542 ============================
545 -----------------------
547 - [You can now use macros for values in some built-in attributes.][83366]
548 This primarily allows you to call macros within the `#[doc]` attribute. For
549 example, to include external documentation in your crate, you can now write
552 #![doc = include_str!("README.md")]
555 - [You can now cast between unsized slice types (and types which contain
556 unsized slices) in `const fn`.][85078]
557 - [You can now use multiple generic lifetimes with `impl Trait` where the
558 lifetimes don't explicitly outlive another.][84701] In code this means
559 that you can now have `impl Trait<'a, 'b>` where as before you could
560 only have `impl Trait<'a, 'b> where 'b: 'a`.
563 -----------------------
565 - [Rustc will now search for custom JSON targets in
566 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
567 directory.][83800] You can find your sysroot directory by running
568 `rustc --print sysroot`.
569 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
570 - [You can now use `#[target_feature]` on safe functions when targeting
571 WebAssembly platforms.][84988]
572 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
573 - [Added tier 3\* support for `bpfel-unknown-none`
574 and `bpfeb-unknown-none`.][79608]
575 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
577 \* Refer to Rust's [platform support page][platform-support-doc] for more
578 information on Rust's tiered platform support.
581 -----------------------
583 - [`panic::panic_any` will now `#[track_caller]`.][85745]
584 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
585 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
586 - [The implementations of vendor intrinsics in core::arch have been
587 significantly refactored.][83278] The main user-visible changes are
588 a 50% reduction in the size of libcore.rlib and stricter validation
589 of constant operands passed to intrinsics. The latter is technically
590 a breaking change, but allows Rust to more closely match the C vendor
596 - [`BTreeMap::into_keys`]
597 - [`BTreeMap::into_values`]
598 - [`HashMap::into_keys`]
599 - [`HashMap::into_values`]
601 - [`VecDeque::binary_search`]
602 - [`VecDeque::binary_search_by`]
603 - [`VecDeque::binary_search_by_key`]
604 - [`VecDeque::partition_point`]
609 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
610 the dependency graph.][cargo/9520]
611 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
612 in the tree ][cargo/9499]
613 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
614 macro dependencies.][cargo/9488]
615 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
616 This variable points to a directory that integration tests and benches
617 can use as a "scratchpad" for testing filesystem operations.
621 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
622 - [Previously unsound code is no longer permitted where different constructors in branches
623 could require different lifetimes.][85574]
624 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
625 than before and may reject some previously accepted code.
626 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
627 when compiled with `codegen-units = 1`.][86063]
629 [85574]: https://github.com/rust-lang/rust/issues/85574
630 [86831]: https://github.com/rust-lang/rust/issues/86831
631 [86063]: https://github.com/rust-lang/rust/issues/86063
632 [79608]: https://github.com/rust-lang/rust/pull/79608
633 [84988]: https://github.com/rust-lang/rust/pull/84988
634 [84701]: https://github.com/rust-lang/rust/pull/84701
635 [84072]: https://github.com/rust-lang/rust/pull/84072
636 [85745]: https://github.com/rust-lang/rust/pull/85745
637 [84744]: https://github.com/rust-lang/rust/pull/84744
638 [85078]: https://github.com/rust-lang/rust/pull/85078
639 [84717]: https://github.com/rust-lang/rust/pull/84717
640 [83800]: https://github.com/rust-lang/rust/pull/83800
641 [83366]: https://github.com/rust-lang/rust/pull/83366
642 [83278]: https://github.com/rust-lang/rust/pull/83278
643 [85292]: https://github.com/rust-lang/rust/pull/85292
644 [82834]: https://github.com/rust-lang/rust/pull/82834
645 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
646 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
647 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
648 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
649 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
650 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
651 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
652 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
653 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
654 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
655 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
657 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
659 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
661 Version 1.53.0 (2021-06-17)
662 ============================
665 -----------------------
666 - [You can now use unicode for identifiers.][83799] This allows multilingual
667 identifiers but still doesn't allow glyphs that are not considered characters
668 such as `◆` or `🦀`. More specifically you can now use any identifier that
669 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
670 is the same standard as languages like Python, however Rust uses NFC
671 normalization which may be different from other languages.
672 - [You can now specify "or patterns" inside pattern matches.][79278]
673 Previously you could only use `|` (OR) on complete patterns. E.g.
677 matches!(x, Some(1) | Some(2));
679 matches!(x, Some(1 | 2));
681 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
682 has the same semantics as the `:pat` matcher. This is to allow `:pat`
683 to change semantics to being a pattern fragment in a future edition.
686 -----------------------
687 - [Updated the minimum external LLVM version to LLVM 10.][83387]
688 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
689 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
691 \* Refer to Rust's [platform support page][platform-support-doc] for more
692 information on Rust's tiered platform support.
695 -----------------------
696 - [Abort messages will now forward to `android_set_abort_message` on
697 Android platforms when available.][81469]
698 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
699 - [Arrays of any length now implement `IntoIterator`.][84147]
700 Currently calling `.into_iter()` as a method on an array will
701 return `impl Iterator<Item=&T>`, but this may change in a
702 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
703 directly on arrays will provide `impl Iterator<Item=T>` as expected.
704 - [`leading_zeros`, and `trailing_zeros` are now available on all
705 `NonZero` integer types.][84082]
706 - [`{f32, f64}::from_str` now parse and print special values
707 (`NaN`, `-0`) according to IEEE 754.][78618]
708 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
709 - [Add the `BITS` associated constant to all numeric types.][82565]
713 - [`AtomicBool::fetch_update`]
714 - [`AtomicPtr::fetch_update`]
715 - [`BTreeMap::retain`]
716 - [`BTreeSet::retain`]
717 - [`BufReader::seek_relative`]
718 - [`DebugStruct::non_exhaustive`]
721 - [`Duration::is_zero`]
722 - [`Duration::saturating_add`]
723 - [`Duration::saturating_mul`]
724 - [`Duration::saturating_sub`]
725 - [`ErrorKind::Unsupported`]
727 - [`Ordering::is_eq`]
728 - [`Ordering::is_ge`]
729 - [`Ordering::is_gt`]
730 - [`Ordering::is_le`]
731 - [`Ordering::is_lt`]
732 - [`Ordering::is_ne`]
733 - [`OsStr::is_ascii`]
734 - [`OsStr::make_ascii_lowercase`]
735 - [`OsStr::make_ascii_uppercase`]
736 - [`OsStr::to_ascii_lowercase`]
737 - [`OsStr::to_ascii_uppercase`]
738 - [`Peekable::peek_mut`]
739 - [`Rc::decrement_strong_count`]
740 - [`Rc::increment_strong_count`]
741 - [`Vec::extend_from_within`]
742 - [`array::from_mut`]
743 - [`array::from_ref`]
744 - [`cmp::max_by_key`]
746 - [`cmp::min_by_key`]
748 - [`f32::is_subnormal`]
749 - [`f64::is_subnormal`]
752 -----------------------
753 - [Cargo now supports git repositories where the default `HEAD` branch is not
754 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
755 which can handle default branches correctly.
756 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
757 - [The `authors` field is no longer included in `Cargo.toml` for new
758 projects.][cargo/9282]
761 -----------------------
762 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
763 without hyperlinks.][81764]
767 - [Implement token-based handling of attributes during expansion][82608]
768 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
769 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
770 to confusion and potential security vulnerabilities and [is no
771 longer recommended][ietf6943].
772 - [The added `BITS` constant may conflict with external definitions.][85667]
773 In particular, this was known to be a problem in the `lexical-core` crate,
774 but they have published fixes for semantic versions 0.4 through 0.7. To
775 update this dependency alone, use `cargo update -p lexical-core`.
776 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
780 These changes provide no direct user facing benefits, but represent significant
781 improvements to the internals and overall performance of rustc and
784 - [Rework the `std::sys::windows::alloc` implementation.][83065]
785 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
786 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
787 - [Rework rustdoc const type][82873]
789 [85667]: https://github.com/rust-lang/rust/pull/85667
790 [83386]: https://github.com/rust-lang/rust/pull/83386
791 [82771]: https://github.com/rust-lang/rust/pull/82771
792 [84147]: https://github.com/rust-lang/rust/pull/84147
793 [84082]: https://github.com/rust-lang/rust/pull/84082
794 [83799]: https://github.com/rust-lang/rust/pull/83799
795 [83681]: https://github.com/rust-lang/rust/pull/83681
796 [83652]: https://github.com/rust-lang/rust/pull/83652
797 [83387]: https://github.com/rust-lang/rust/pull/83387
798 [82873]: https://github.com/rust-lang/rust/pull/82873
799 [82864]: https://github.com/rust-lang/rust/pull/82864
800 [82608]: https://github.com/rust-lang/rust/pull/82608
801 [82565]: https://github.com/rust-lang/rust/pull/82565
802 [80525]: https://github.com/rust-lang/rust/pull/80525
803 [79278]: https://github.com/rust-lang/rust/pull/79278
804 [78618]: https://github.com/rust-lang/rust/pull/78618
805 [77704]: https://github.com/rust-lang/rust/pull/77704
806 [83941]: https://github.com/rust-lang/rust/pull/83941
807 [83065]: https://github.com/rust-lang/rust/pull/83065
808 [81764]: https://github.com/rust-lang/rust/pull/81764
809 [81469]: https://github.com/rust-lang/rust/pull/81469
810 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
811 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
812 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
813 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
814 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
815 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
816 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
817 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
818 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
819 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
820 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
821 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
822 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
823 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
824 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
825 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
826 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
827 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
828 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
829 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
830 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
831 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
832 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
833 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
834 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
835 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
836 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
837 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
838 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
839 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
840 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
841 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
842 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
843 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
844 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
845 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
846 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
847 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
848 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
849 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
850 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
853 Version 1.52.1 (2021-05-10)
854 ============================
856 This release disables incremental compilation, unless the user has explicitly
857 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
859 This is due to the widespread, and frequently occuring, breakage encountered by
860 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
861 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
862 newly added incremental verification are still present in past stable versions,
863 and are not yet fixed on any channel. These bugs can lead to miscompilation of
866 These problems only affect incremental builds, so release builds with Cargo
867 should not be affected unless the user has explicitly opted into incremental.
868 Debug and check builds are affected.
870 See [84970] for more details.
872 [84970]: https://github.com/rust-lang/rust/issues/84970
874 Version 1.52.0 (2021-05-06)
875 ============================
879 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
880 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
881 is allowed by default, and may become a warning or hard error in a
883 - [You can now cast mutable references to arrays to a pointer of the same type as
888 - [Upgraded the default LLVM to LLVM 12.][81451]
890 Added tier 3\* support for the following targets.
892 - [`s390x-unknown-linux-musl`][82166]
893 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
894 - [`powerpc-unknown-openbsd`][82733]
896 \* Refer to Rust's [platform support page][platform-support-doc] for more
897 information on Rust's tiered platform support.
901 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
902 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
903 - [`Arc<impl Error>` now implements `error::Error`.][80553]
904 - [All integer division and remainder operations are now `const`.][80962]
908 - [`Arguments::as_str`]
910 - [`char::REPLACEMENT_CHARACTER`]
911 - [`char::UNICODE_VERSION`]
912 - [`char::decode_utf16`]
913 - [`char::from_digit`]
914 - [`char::from_u32_unchecked`]
916 - [`slice::partition_point`]
917 - [`str::rsplit_once`]
918 - [`str::split_once`]
920 The following previously stable APIs are now `const`.
923 - [`char::len_utf16`]
924 - [`char::to_ascii_uppercase`]
925 - [`char::to_ascii_lowercase`]
926 - [`char::eq_ignore_ascii_case`]
927 - [`u8::to_ascii_uppercase`]
928 - [`u8::to_ascii_lowercase`]
929 - [`u8::eq_ignore_ascii_case`]
933 - [Rustdoc lints are now treated as a tool lint, meaning that
934 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
935 Using the old style is still allowed, and will become a warning in
937 - [Rustdoc now supports argument files.][82261]
938 - [Rustdoc now generates smart punctuation for documentation.][79423]
939 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
947 - [You can now pass multiple filters to tests.][81356] E.g.
948 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
949 - [Rustup now distributes PDB symbols for the `std` library on Windows,
950 allowing you to see `std` symbols when debugging.][82218]
954 These changes provide no direct user facing benefits, but represent significant
955 improvements to the internals and overall performance of rustc and
958 - [Check the result cache before the DepGraph when ensuring queries][81855]
959 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
960 - [Only store a LocalDefId in some HIR nodes][81611]
961 - [Store HIR attributes in a side table][79519]
965 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
966 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
967 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
968 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
969 languages in code blocks.][78429]
970 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
971 - [Changes in how proc macros handle whitespace may lead to panics when used
972 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
973 - [Turn `#[derive]` into a regular macro attribute][79078]
975 [84136]: https://github.com/rust-lang/rust/issues/84136
976 [80763]: https://github.com/rust-lang/rust/pull/80763
977 [82166]: https://github.com/rust-lang/rust/pull/82166
978 [82121]: https://github.com/rust-lang/rust/pull/82121
979 [81879]: https://github.com/rust-lang/rust/pull/81879
980 [82261]: https://github.com/rust-lang/rust/pull/82261
981 [82218]: https://github.com/rust-lang/rust/pull/82218
982 [82216]: https://github.com/rust-lang/rust/pull/82216
983 [82202]: https://github.com/rust-lang/rust/pull/82202
984 [81855]: https://github.com/rust-lang/rust/pull/81855
985 [81766]: https://github.com/rust-lang/rust/pull/81766
986 [81744]: https://github.com/rust-lang/rust/pull/81744
987 [81611]: https://github.com/rust-lang/rust/pull/81611
988 [81479]: https://github.com/rust-lang/rust/pull/81479
989 [81451]: https://github.com/rust-lang/rust/pull/81451
990 [81356]: https://github.com/rust-lang/rust/pull/81356
991 [80962]: https://github.com/rust-lang/rust/pull/80962
992 [80553]: https://github.com/rust-lang/rust/pull/80553
993 [80527]: https://github.com/rust-lang/rust/pull/80527
994 [79519]: https://github.com/rust-lang/rust/pull/79519
995 [79423]: https://github.com/rust-lang/rust/pull/79423
996 [79208]: https://github.com/rust-lang/rust/pull/79208
997 [78429]: https://github.com/rust-lang/rust/pull/78429
998 [82733]: https://github.com/rust-lang/rust/pull/82733
999 [82594]: https://github.com/rust-lang/rust/pull/82594
1000 [79078]: https://github.com/rust-lang/rust/pull/79078
1001 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1002 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1003 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1004 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1005 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1006 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1007 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1008 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1009 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1010 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1011 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1012 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1013 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1014 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1015 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1016 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1017 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1018 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1019 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1020 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1021 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1022 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1024 Version 1.51.0 (2021-03-25)
1025 ============================
1029 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1030 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1031 E.g. you can now write the following. Note: Only values of primitive integers,
1032 `bool`, or `char` types are currently permitted.
1034 struct GenericArray<T, const LENGTH: usize> {
1038 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1039 const fn last(&self) -> Option<&T> {
1043 Some(&self.inner[LENGTH - 1])
1053 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1054 This option controls whether debug information is split across multiple files
1055 or packed into a single file. **Note** This option is unstable on other platforms.
1056 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1057 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1058 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1059 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1061 \* Refer to Rust's [platform support page][platform-support-doc] for more
1062 information on Rust's tiered platform support.
1067 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1068 - [`str` now implements `AsMut<str>`.][80279]
1069 - [`u64` and `u128` now implement `From<char>`.][79502]
1070 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1071 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1072 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1073 - [`io::Empty` now implements `io::Seek`.][78044]
1074 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1075 `T: ?Sized` types.][80764]
1076 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1082 - [`Arc::decrement_strong_count`]
1083 - [`Arc::increment_strong_count`]
1084 - [`Once::call_once_force`]
1085 - [`Peekable::next_if_eq`]
1086 - [`Peekable::next_if`]
1087 - [`Seek::stream_position`]
1088 - [`array::IntoIter`]
1089 - [`panic::panic_any`]
1091 - [`ptr::addr_of_mut!`]
1092 - [`slice::fill_with`]
1093 - [`slice::split_inclusive_mut`]
1094 - [`slice::split_inclusive`]
1095 - [`slice::strip_prefix`]
1096 - [`slice::strip_suffix`]
1097 - [`str::split_inclusive`]
1098 - [`sync::OnceState`]
1100 - [`VecDeque::range`]
1101 - [`VecDeque::range_mut`]
1105 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1106 codegen option.][cargo/9112]
1107 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1108 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1109 to avoid unifying features of dependencies where that unification could be unwanted.
1110 Such as using the same dependency with a `std` feature in a build scripts and
1111 proc-macros, while using the `no-std` feature in the final binary. See the
1112 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1117 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1118 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1119 documentation.][79642]
1121 Various improvements to intra-doc links:
1123 - [You can link to non-path primitives such as `slice`.][80181]
1124 - [You can link to associated items.][74489]
1125 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1129 - [You can now pass `--include-ignored` to tests (e.g. with
1130 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1135 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1136 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1138 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1139 for the distributed artifacts.][81521]
1140 - `armv5te-unknown-linux-gnueabi`
1141 - `sparc64-unknown-linux-gnu`
1142 - `thumbv7neon-unknown-linux-gnueabihf`
1143 - `armv7-unknown-linux-gnueabi`
1144 - `x86_64-unknown-linux-gnux32`
1145 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1150 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1152 [79135]: https://github.com/rust-lang/rust/pull/79135
1153 [74489]: https://github.com/rust-lang/rust/pull/74489
1154 [76934]: https://github.com/rust-lang/rust/pull/76934
1155 [79570]: https://github.com/rust-lang/rust/pull/79570
1156 [80181]: https://github.com/rust-lang/rust/pull/80181
1157 [79642]: https://github.com/rust-lang/rust/pull/79642
1158 [80945]: https://github.com/rust-lang/rust/pull/80945
1159 [80279]: https://github.com/rust-lang/rust/pull/80279
1160 [80053]: https://github.com/rust-lang/rust/pull/80053
1161 [79502]: https://github.com/rust-lang/rust/pull/79502
1162 [75180]: https://github.com/rust-lang/rust/pull/75180
1163 [81521]: https://github.com/rust-lang/rust/pull/81521
1164 [80968]: https://github.com/rust-lang/rust/pull/80968
1165 [80959]: https://github.com/rust-lang/rust/pull/80959
1166 [80718]: https://github.com/rust-lang/rust/pull/80718
1167 [80653]: https://github.com/rust-lang/rust/pull/80653
1168 [80579]: https://github.com/rust-lang/rust/pull/80579
1169 [79998]: https://github.com/rust-lang/rust/pull/79998
1170 [78044]: https://github.com/rust-lang/rust/pull/78044
1171 [81455]: https://github.com/rust-lang/rust/pull/81455
1172 [80764]: https://github.com/rust-lang/rust/pull/80764
1173 [80749]: https://github.com/rust-lang/rust/pull/80749
1174 [80662]: https://github.com/rust-lang/rust/pull/80662
1175 [79134]: https://github.com/rust-lang/rust/pull/79134
1176 [80966]: https://github.com/rust-lang/rust/pull/80966
1177 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1178 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1179 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1180 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1181 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1182 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1183 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1184 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1185 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1186 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1187 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1188 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1189 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1190 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1191 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1192 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1193 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1194 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1195 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1196 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1197 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1198 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1199 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1201 Version 1.50.0 (2021-02-11)
1202 ============================
1205 -----------------------
1206 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1207 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1208 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1211 -----------------------
1212 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1213 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1214 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1215 - [Dropped support for all cloudabi targets.][78439]
1217 \* Refer to Rust's [platform support page][platform-support-doc] for more
1218 information on Rust's tiered platform support.
1221 -----------------------
1223 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1224 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1225 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1226 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1227 up the same amount of space as `File`.
1233 - [`btree_map::Entry::or_insert_with_key`]
1236 - [`hash_map::Entry::or_insert_with_key`]
1240 - [`UnsafeCell::get_mut`]
1242 The following previously stable methods are now `const`.
1244 - [`IpAddr::is_ipv4`]
1245 - [`IpAddr::is_ipv6`]
1246 - [`IpAddr::is_unspecified`]
1247 - [`IpAddr::is_loopback`]
1248 - [`IpAddr::is_multicast`]
1249 - [`Ipv4Addr::octets`]
1250 - [`Ipv4Addr::is_loopback`]
1251 - [`Ipv4Addr::is_private`]
1252 - [`Ipv4Addr::is_link_local`]
1253 - [`Ipv4Addr::is_multicast`]
1254 - [`Ipv4Addr::is_broadcast`]
1255 - [`Ipv4Addr::is_documentation`]
1256 - [`Ipv4Addr::to_ipv6_compatible`]
1257 - [`Ipv4Addr::to_ipv6_mapped`]
1258 - [`Ipv6Addr::segments`]
1259 - [`Ipv6Addr::is_unspecified`]
1260 - [`Ipv6Addr::is_loopback`]
1261 - [`Ipv6Addr::is_multicast`]
1262 - [`Ipv6Addr::to_ipv4`]
1265 - [`Layout::from_size_align`]
1266 - `pow` for all integer types.
1267 - `checked_pow` for all integer types.
1268 - `saturating_pow` for all integer types.
1269 - `wrapping_pow` for all integer types.
1270 - `next_power_of_two` for all unsigned integer types.
1271 - `checked_next_power_of_two` for all unsigned integer types.
1274 -----------------------
1276 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1277 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1278 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1279 contents of that directory for changes.][cargo/8973]
1280 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1285 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1286 - [Running tests will now print the total time taken to execute.][75752]
1291 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1292 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1293 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1294 unhygenic `macro_rules!` macros.][79472]
1295 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1296 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1297 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1298 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1299 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1300 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1302 [74989]: https://github.com/rust-lang/rust/pull/74989
1303 [79261]: https://github.com/rust-lang/rust/pull/79261
1304 [79896]: https://github.com/rust-lang/rust/pull/79896
1305 [79484]: https://github.com/rust-lang/rust/pull/79484
1306 [79472]: https://github.com/rust-lang/rust/pull/79472
1307 [79270]: https://github.com/rust-lang/rust/pull/79270
1308 [79003]: https://github.com/rust-lang/rust/pull/79003
1309 [78864]: https://github.com/rust-lang/rust/pull/78864
1310 [78636]: https://github.com/rust-lang/rust/pull/78636
1311 [78439]: https://github.com/rust-lang/rust/pull/78439
1312 [78343]: https://github.com/rust-lang/rust/pull/78343
1313 [78296]: https://github.com/rust-lang/rust/pull/78296
1314 [78068]: https://github.com/rust-lang/rust/pull/78068
1315 [75752]: https://github.com/rust-lang/rust/pull/75752
1316 [74699]: https://github.com/rust-lang/rust/pull/74699
1317 [78142]: https://github.com/rust-lang/rust/pull/78142
1318 [77484]: https://github.com/rust-lang/rust/pull/77484
1319 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1320 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1321 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1322 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1323 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1324 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1325 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1326 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1327 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1328 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1329 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1330 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1331 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1332 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1333 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1334 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1335 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1336 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1337 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1338 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1339 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1340 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1341 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1342 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1343 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1344 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1345 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1346 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1347 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1348 [`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
1349 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1350 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1351 [`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
1352 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1355 Version 1.49.0 (2020-12-31)
1356 ============================
1359 -----------------------
1361 - [Unions can now implement `Drop`, and you can now have a field in a union
1362 with `ManuallyDrop<T>`.][77547]
1363 - [You can now cast uninhabited enums to integers.][76199]
1364 - [You can now bind by reference and by move in patterns.][76119] This
1365 allows you to selectively borrow individual components of a type. E.g.
1373 let person = Person {
1374 name: String::from("Alice"),
1378 // `name` is moved out of person, but `age` is referenced.
1379 let Person { name, ref age } = person;
1380 println!("{} {}", name, age);
1384 -----------------------
1386 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1387 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1388 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1389 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1390 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1391 - [Output from threads spawned in tests is now captured.][78227]
1392 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1394 \* Refer to Rust's [platform support page][platform-support-doc] for more
1395 information on Rust's tiered platform support.
1398 -----------------------
1400 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1401 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1406 - [`slice::select_nth_unstable`]
1407 - [`slice::select_nth_unstable_by`]
1408 - [`slice::select_nth_unstable_by_key`]
1410 The following previously stable methods are now `const`.
1412 - [`Poll::is_ready`]
1413 - [`Poll::is_pending`]
1416 -----------------------
1417 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1418 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1419 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1420 variable will be set if the crate being built is one the user selected to build, either
1421 with `-p` or through defaults.
1422 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1428 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1429 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1430 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1431 Previously such invalid or unused attributes could be ignored.
1432 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1433 read [this post about the changes][rustdoc-ws-post] for more details.
1434 - [Trait bounds are no longer inferred for associated types.][79904]
1438 These changes provide no direct user facing benefits, but represent significant
1439 improvements to the internals and overall performance of rustc and
1442 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1443 Local Storage model.][78201]
1444 - [Calculate visibilities once in resolve.][78077]
1445 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1446 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1449 [75991]: https://github.com/rust-lang/rust/pull/75991
1450 [78951]: https://github.com/rust-lang/rust/pull/78951
1451 [78848]: https://github.com/rust-lang/rust/pull/78848
1452 [78746]: https://github.com/rust-lang/rust/pull/78746
1453 [78376]: https://github.com/rust-lang/rust/pull/78376
1454 [78228]: https://github.com/rust-lang/rust/pull/78228
1455 [78227]: https://github.com/rust-lang/rust/pull/78227
1456 [78201]: https://github.com/rust-lang/rust/pull/78201
1457 [78109]: https://github.com/rust-lang/rust/pull/78109
1458 [78077]: https://github.com/rust-lang/rust/pull/78077
1459 [77997]: https://github.com/rust-lang/rust/pull/77997
1460 [77703]: https://github.com/rust-lang/rust/pull/77703
1461 [77547]: https://github.com/rust-lang/rust/pull/77547
1462 [77015]: https://github.com/rust-lang/rust/pull/77015
1463 [76199]: https://github.com/rust-lang/rust/pull/76199
1464 [76119]: https://github.com/rust-lang/rust/pull/76119
1465 [75914]: https://github.com/rust-lang/rust/pull/75914
1466 [79004]: https://github.com/rust-lang/rust/pull/79004
1467 [78676]: https://github.com/rust-lang/rust/pull/78676
1468 [79904]: https://github.com/rust-lang/rust/issues/79904
1469 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1470 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1471 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1472 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1473 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1474 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1475 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1476 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1477 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1478 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1480 Version 1.48.0 (2020-11-19)
1481 ==========================
1486 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1487 is still rejected *semantically*, but can now be parsed by procedural macros.
1491 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1492 `rustc` whether to link its own C runtime and libraries or to rely on a external
1493 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1494 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1495 Note: If you're using cargo you must explicitly pass the `--target` flag.
1496 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1498 \* Refer to Rust's [platform support page][platform-support-doc] for more
1499 information on Rust's tiered platform support.
1503 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1504 and `&Stderr`.][76275]
1505 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1506 - [The `matches!` macro now supports having a trailing comma.][74880]
1507 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1508 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1512 - [`slice::as_ptr_range`]
1513 - [`slice::as_mut_ptr_range`]
1514 - [`VecDeque::make_contiguous`]
1515 - [`future::pending`]
1518 The following previously stable methods are now `const fn`'s:
1520 - [`Option::is_some`]
1521 - [`Option::is_none`]
1522 - [`Option::as_ref`]
1524 - [`Result::is_err`]
1525 - [`Result::as_ref`]
1526 - [`Ordering::reverse`]
1527 - [`Ordering::then`]
1534 - [You can now link to items in `rustdoc` using the intra-doc link
1535 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1536 a link to `std::future`'s documentation. See ["Linking to items by
1537 name"][intradoc-links] for more information.
1538 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1539 when searching through `rustdoc`'s UI.][75740]
1543 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1544 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1545 promoted to `'static` lifetime any more inside `const fn`s.
1546 - [Associated type bindings on trait objects are now verified to meet the bounds
1547 declared on the trait when checking that they implement the trait.][27675]
1548 - [When trait bounds on associated types or opaque types are ambiguous, the
1549 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1550 - [Fixed recursive nonterminals not being expanded in macros during
1551 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1552 correctly handling recursive nonterminal tokens.
1553 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1554 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1555 in places where they have no effect.][73461]
1556 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1557 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1558 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1559 disallow zero-initialization.][71274]
1560 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1561 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1562 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1563 see the [`catch_unwind`] documentation for further information.
1569 These changes provide no direct user facing benefits, but represent significant
1570 improvements to the internals and overall performance of rustc and
1573 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1574 You can continue building with `make` by setting `ninja=false` in
1576 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1577 - [Made `ensure_sufficient_stack()` non-generic][76680]
1579 [78143]: https://github.com/rust-lang/rust/issues/78143
1580 [76680]: https://github.com/rust-lang/rust/pull/76680/
1581 [76030]: https://github.com/rust-lang/rust/pull/76030/
1582 [70212]: https://github.com/rust-lang/rust/pull/70212/
1583 [27675]: https://github.com/rust-lang/rust/issues/27675/
1584 [54121]: https://github.com/rust-lang/rust/issues/54121/
1585 [71274]: https://github.com/rust-lang/rust/pull/71274/
1586 [77386]: https://github.com/rust-lang/rust/pull/77386/
1587 [77153]: https://github.com/rust-lang/rust/pull/77153/
1588 [77055]: https://github.com/rust-lang/rust/pull/77055/
1589 [76275]: https://github.com/rust-lang/rust/pull/76275/
1590 [76310]: https://github.com/rust-lang/rust/pull/76310/
1591 [76420]: https://github.com/rust-lang/rust/pull/76420/
1592 [76158]: https://github.com/rust-lang/rust/pull/76158/
1593 [75857]: https://github.com/rust-lang/rust/pull/75857/
1594 [75585]: https://github.com/rust-lang/rust/pull/75585/
1595 [75740]: https://github.com/rust-lang/rust/pull/75740/
1596 [75502]: https://github.com/rust-lang/rust/pull/75502/
1597 [74880]: https://github.com/rust-lang/rust/pull/74880/
1598 [74922]: https://github.com/rust-lang/rust/pull/74922/
1599 [74430]: https://github.com/rust-lang/rust/pull/74430/
1600 [74194]: https://github.com/rust-lang/rust/pull/74194/
1601 [73461]: https://github.com/rust-lang/rust/pull/73461/
1602 [73166]: https://github.com/rust-lang/rust/pull/73166/
1603 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1604 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1605 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1606 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1607 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1608 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1609 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1610 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1611 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1612 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1613 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1614 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1615 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1616 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1617 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1620 Version 1.47.0 (2020-10-08)
1621 ==========================
1625 - [Closures will now warn when not used.][74869]
1629 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1630 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1632 - [Upgraded to LLVM 11.][73526]
1633 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1634 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1635 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1637 \* Refer to Rust's [platform support page][platform-support-doc] for more
1638 information on Rust's tiered platform support.
1642 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1643 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1644 those of length less than 33.][74060]
1645 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1646 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1647 `PartialEq`, and `PartialOrd`.][73583]
1651 - [`Ident::new_raw`]
1652 - [`Range::is_empty`]
1653 - [`RangeInclusive::is_empty`]
1654 - [`Result::as_deref`]
1655 - [`Result::as_deref_mut`]
1657 - [`pointer::offset_from`]
1661 The following previously stable APIs have now been made const.
1663 - [The `new` method for all `NonZero` integers.][73858]
1664 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1665 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1666 methods for all integers.][73858]
1667 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1668 signed integers.][73858]
1669 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1670 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1671 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1672 `is_ascii_control` methods for `char` and `u8`.][73858]
1676 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1677 You can override this by setting the following in your `Cargo.toml`.
1679 [profile.release.build-override]
1682 - [`cargo-help` will now display man pages for commands rather just the
1683 `--help` text.][cargo/8456]
1684 - [`cargo-metadata` now emits a `test` field indicating if a target has
1685 tests enabled.][cargo/8478]
1686 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1687 - [`cargo-publish` will now use an alternative registry by default if it's the
1688 only registry specified in `package.publish`.][cargo/8571]
1692 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1693 type based search.][75366]
1694 - [Added the Ayu theme to rustdoc.][71237]
1698 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1699 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1700 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1701 help to preserve more span information.][73084] These changes may cause
1702 compiliation errors if your macro was unhygenic or didn't correctly handle
1704 - [Moved support for the CloudABI target to tier 3.][75568]
1705 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1706 - [Added the `rustc-docs` component.][75560] This allows you to install
1707 and read the documentation for the compiler internal APIs. (Currently only
1708 available for `x86_64-unknown-linux-gnu`.)
1713 - [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.
1715 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1716 [75048]: https://github.com/rust-lang/rust/pull/75048/
1717 [74163]: https://github.com/rust-lang/rust/pull/74163/
1718 [71237]: https://github.com/rust-lang/rust/pull/71237/
1719 [74869]: https://github.com/rust-lang/rust/pull/74869/
1720 [73858]: https://github.com/rust-lang/rust/pull/73858/
1721 [75716]: https://github.com/rust-lang/rust/pull/75716/
1722 [75560]: https://github.com/rust-lang/rust/pull/75560/
1723 [75568]: https://github.com/rust-lang/rust/pull/75568/
1724 [75366]: https://github.com/rust-lang/rust/pull/75366/
1725 [75204]: https://github.com/rust-lang/rust/pull/75204/
1726 [74650]: https://github.com/rust-lang/rust/pull/74650/
1727 [74419]: https://github.com/rust-lang/rust/pull/74419/
1728 [73964]: https://github.com/rust-lang/rust/pull/73964/
1729 [74021]: https://github.com/rust-lang/rust/pull/74021/
1730 [74060]: https://github.com/rust-lang/rust/pull/74060/
1731 [73893]: https://github.com/rust-lang/rust/pull/73893/
1732 [73526]: https://github.com/rust-lang/rust/pull/73526/
1733 [73583]: https://github.com/rust-lang/rust/pull/73583/
1734 [73084]: https://github.com/rust-lang/rust/pull/73084/
1735 [73197]: https://github.com/rust-lang/rust/pull/73197/
1736 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1737 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1738 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1739 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1740 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1741 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1742 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1743 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1744 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1745 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1746 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1747 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1748 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1749 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1752 Version 1.46.0 (2020-08-27)
1753 ==========================
1757 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1758 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1759 const functions.][73862]
1760 - [The `#[track_caller]` attribute can now be added to functions to use the
1761 function's caller's location information for panic messages.][72445]
1762 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1763 `x.0.0` over `(x.0).0`.
1764 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1765 You currently can't use `mem::transmute` in constant functions.
1769 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1770 - [Enabled static "Position Independent Executables" by default
1771 for `x86_64-unknown-linux-musl`.][70740]
1775 - [`mem::forget` is now a `const fn`.][73887]
1776 - [`String` now implements `From<char>`.][73466]
1777 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1778 integer types.][73032]
1779 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1780 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1781 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1782 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1783 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1784 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1789 - [`vec::Drain::as_slice`]
1793 Added a number of new environment variables that are now available when
1794 compiling your crate.
1796 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
1797 the specific binary being compiled and the name of the crate.
1798 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
1799 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
1803 - [The target configuration option `abi_blacklist` has been renamed
1804 to `unsupported_abis`.][74150] The old name will still continue to work.
1805 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
1806 This was previously accepted but will become a hard error in a future release.
1807 - [Rustc will fail to compile if you have a struct with
1808 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
1810 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
1811 ensure that spans have the correct information, and may cause breakage if you
1812 were relying on receiving spans with dummy information.
1813 - [The InnoSetup installer for Windows is no longer available.][72569] This was
1814 a legacy installer that was replaced by a MSI installer a few years ago but
1815 was still being built.
1816 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
1817 - [Rustc will no longer accept overlapping trait implementations that only
1818 differ in how the lifetime was bound.][72493]
1819 - [Rustc now correctly relates the lifetime of an existential associated
1820 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
1821 you to pass a shorter lifetime than expected.
1822 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
1823 The library will need to be installed for `rustc` to work, even though we
1824 expect it to be already available on most systems.
1825 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
1827 - [Pretty printing of some tokens in procedural macros changed.][75453] The
1828 exact output returned by rustc's pretty printing is an unstable
1829 implementation detail: we recommend any macro relying on it to switch to a
1830 more robust parsing system.
1832 [75453]: https://github.com/rust-lang/rust/issues/75453/
1833 [74820]: https://github.com/rust-lang/rust/issues/74820/
1834 [74420]: https://github.com/rust-lang/rust/issues/74420/
1835 [74109]: https://github.com/rust-lang/rust/pull/74109/
1836 [74150]: https://github.com/rust-lang/rust/pull/74150/
1837 [73862]: https://github.com/rust-lang/rust/pull/73862/
1838 [73887]: https://github.com/rust-lang/rust/pull/73887/
1839 [73466]: https://github.com/rust-lang/rust/pull/73466/
1840 [73516]: https://github.com/rust-lang/rust/pull/73516/
1841 [73293]: https://github.com/rust-lang/rust/pull/73293/
1842 [73007]: https://github.com/rust-lang/rust/pull/73007/
1843 [73032]: https://github.com/rust-lang/rust/pull/73032/
1844 [72920]: https://github.com/rust-lang/rust/pull/72920/
1845 [72569]: https://github.com/rust-lang/rust/pull/72569/
1846 [72583]: https://github.com/rust-lang/rust/pull/72583/
1847 [72584]: https://github.com/rust-lang/rust/pull/72584/
1848 [72717]: https://github.com/rust-lang/rust/pull/72717/
1849 [72437]: https://github.com/rust-lang/rust/pull/72437/
1850 [72445]: https://github.com/rust-lang/rust/pull/72445/
1851 [72486]: https://github.com/rust-lang/rust/pull/72486/
1852 [72493]: https://github.com/rust-lang/rust/pull/72493/
1853 [72331]: https://github.com/rust-lang/rust/pull/72331/
1854 [71896]: https://github.com/rust-lang/rust/pull/71896/
1855 [71660]: https://github.com/rust-lang/rust/pull/71660/
1856 [71322]: https://github.com/rust-lang/rust/pull/71322/
1857 [70740]: https://github.com/rust-lang/rust/pull/70740/
1858 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
1859 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
1860 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
1861 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
1862 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
1865 Version 1.45.2 (2020-08-03)
1866 ==========================
1868 * [Fix bindings in tuple struct patterns][74954]
1869 * [Fix track_caller integration with trait objects][74784]
1871 [74954]: https://github.com/rust-lang/rust/issues/74954
1872 [74784]: https://github.com/rust-lang/rust/issues/74784
1875 Version 1.45.1 (2020-07-30)
1876 ==========================
1878 * [Fix const propagation with references.][73613]
1879 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
1880 * [Avoid spurious implicit region bound.][74509]
1881 * [Install clippy on x.py install][74457]
1883 [73613]: https://github.com/rust-lang/rust/pull/73613
1884 [73078]: https://github.com/rust-lang/rust/issues/73078
1885 [74509]: https://github.com/rust-lang/rust/pull/74509
1886 [74457]: https://github.com/rust-lang/rust/pull/74457
1889 Version 1.45.0 (2020-07-16)
1890 ==========================
1894 - [Out of range float to int conversions using `as` has been defined as a saturating
1895 conversion.][71269] This was previously undefined behaviour, but you can use the
1896 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
1897 may be desirable in rare performance sensitive situations.
1898 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
1899 using `u64`.][70705]
1900 - [Function like procedural macros can now be used in expression, pattern, and statement
1901 positions.][68717] This means you can now use a function-like procedural macro
1902 anywhere you can use a declarative (`macro_rules!`) macro.
1906 - [You can now override individual target features through the `target-feature`
1907 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
1908 equivalent to `-C target-feature=+avx2,+fma`.
1909 - [Added the `force-unwind-tables` flag.][69984] This option allows
1910 rustc to always generate unwind tables regardless of panic strategy.
1911 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
1912 to include LLVM bitcode into generated `rlib`s (this is on by default).
1913 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
1914 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
1915 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
1916 - [Upgraded to LLVM 10.][67759]
1918 \* Refer to Rust's [platform support page][platform-support-doc] for more
1919 information on Rust's tiered platform support.
1924 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
1926 - [`proc_macro::TokenStream` now implements `Default`.][72234]
1927 - [You can now use `char` with
1928 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
1929 a range of codepoints.][72413] E.g.
1930 you can now write the following;
1932 for ch in 'a'..='z' {
1936 // Prints "abcdefghijklmnopqrstuvwxyz"
1938 - [`OsString` now implements `FromStr`.][71662]
1939 - [The `saturating_neg` method has been added to all signed integer primitive
1940 types, and the `saturating_abs` method has been added for all integer
1941 primitive types.][71886]
1942 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
1943 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
1945 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
1946 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
1947 integer types.][69813]
1948 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
1949 integer types.][72324]
1950 - [The `fetch_update` method has been added to all atomic integer types.][71843]
1955 - [`BTreeMap::remove_entry`]
1957 - [`rc::Weak::as_ptr`]
1958 - [`rc::Weak::from_raw`]
1959 - [`rc::Weak::into_raw`]
1960 - [`str::strip_prefix`]
1961 - [`str::strip_suffix`]
1962 - [`sync::Weak::as_ptr`]
1963 - [`sync::Weak::from_raw`]
1964 - [`sync::Weak::into_raw`]
1965 - [`char::UNICODE_VERSION`]
1966 - [`Span::resolved_at`]
1967 - [`Span::located_at`]
1968 - [`Span::mixed_site`]
1969 - [`unix::process::CommandExt::arg0`]
1974 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
1979 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
1980 `~~outdated information~~` becomes "~~outdated information~~".
1981 - [Added an emoji to Rustdoc's deprecated API message.][72014]
1985 - [Trying to self initialize a static value (that is creating a value using
1986 itself) is unsound and now causes a compile error.][71140]
1987 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
1988 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
1989 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
1990 previously undocumented and not intended for public use. Rustdoc still provides
1991 a non-zero exit code on errors.
1992 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
1993 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
1994 flags while cargo is adding `embed-bitcode` itself. The recommended way to
1995 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
1996 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2000 - [Make clippy a git subtree instead of a git submodule][70655]
2001 - [Unify the undo log of all snapshot types][69464]
2003 [71848]: https://github.com/rust-lang/rust/issues/71848/
2004 [73420]: https://github.com/rust-lang/rust/issues/73420/
2005 [72324]: https://github.com/rust-lang/rust/pull/72324/
2006 [71843]: https://github.com/rust-lang/rust/pull/71843/
2007 [71886]: https://github.com/rust-lang/rust/pull/71886/
2008 [72234]: https://github.com/rust-lang/rust/pull/72234/
2009 [72239]: https://github.com/rust-lang/rust/pull/72239/
2010 [72397]: https://github.com/rust-lang/rust/pull/72397/
2011 [72413]: https://github.com/rust-lang/rust/pull/72413/
2012 [72014]: https://github.com/rust-lang/rust/pull/72014/
2013 [72062]: https://github.com/rust-lang/rust/pull/72062/
2014 [72094]: https://github.com/rust-lang/rust/pull/72094/
2015 [72133]: https://github.com/rust-lang/rust/pull/72133/
2016 [67759]: https://github.com/rust-lang/rust/pull/67759/
2017 [71900]: https://github.com/rust-lang/rust/pull/71900/
2018 [71928]: https://github.com/rust-lang/rust/pull/71928/
2019 [71662]: https://github.com/rust-lang/rust/pull/71662/
2020 [71716]: https://github.com/rust-lang/rust/pull/71716/
2021 [71447]: https://github.com/rust-lang/rust/pull/71447/
2022 [71269]: https://github.com/rust-lang/rust/pull/71269/
2023 [71095]: https://github.com/rust-lang/rust/pull/71095/
2024 [71140]: https://github.com/rust-lang/rust/pull/71140/
2025 [70655]: https://github.com/rust-lang/rust/pull/70655/
2026 [70705]: https://github.com/rust-lang/rust/pull/70705/
2027 [69984]: https://github.com/rust-lang/rust/pull/69984/
2028 [69813]: https://github.com/rust-lang/rust/pull/69813/
2029 [69464]: https://github.com/rust-lang/rust/pull/69464/
2030 [68717]: https://github.com/rust-lang/rust/pull/68717/
2031 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2032 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2033 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2034 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2035 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2036 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2037 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2038 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2039 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2040 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2041 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2042 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2043 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2044 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2045 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2046 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2047 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2050 Version 1.44.1 (2020-06-18)
2051 ===========================
2053 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2054 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2055 * [Fix crashes when finding backtrace on macOS.][71397]
2056 * [Clippy applies lint levels into different files.][clippy/5356]
2058 [71397]: https://github.com/rust-lang/rust/issues/71397
2059 [73078]: https://github.com/rust-lang/rust/issues/73078
2060 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2061 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2064 Version 1.44.0 (2020-06-04)
2065 ==========================
2069 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2070 - [Added the `unused_braces` lint.][70081]
2072 **Syntax-only changes**
2074 - [Expansion-driven outline module parsing][69838]
2079 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2084 These are still rejected semantically, so you will likely receive an error but
2085 these changes can be seen and parsed by macros and conditional compilation.
2089 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2090 Additionally when in incremental mode rustc defaults to 256 codegen units.
2091 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2092 a panic is thrown.][67502]
2093 - [Added tier 3\* support for the `aarch64-unknown-none` and
2094 `aarch64-unknown-none-softfloat` targets.][68334]
2095 - [Added tier 3 support for `arm64-apple-tvos` and
2096 `x86_64-apple-tvos` targets.][68191]
2101 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2102 `vec![]` to be able to be used in `const` contexts.
2103 - [`convert::Infallible` now implements `Hash`.][70281]
2104 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2105 a `&mut OsStr`.][70048]
2106 - [Unicode 13 is now supported.][69929]
2107 - [`String` now implements `From<&mut str>`.][69661]
2108 - [`IoSlice` now implements `Copy`.][69403]
2109 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2110 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2111 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2112 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2113 integer types.][69373]
2117 - [`PathBuf::with_capacity`]
2118 - [`PathBuf::capacity`]
2119 - [`PathBuf::clear`]
2120 - [`PathBuf::reserve`]
2121 - [`PathBuf::reserve_exact`]
2122 - [`PathBuf::shrink_to_fit`]
2123 - [`f32::to_int_unchecked`]
2124 - [`f64::to_int_unchecked`]
2125 - [`Layout::align_to`]
2126 - [`Layout::pad_to_align`]
2128 - [`Layout::extend`]
2132 - [Added the `cargo tree` command which will print a tree graph of
2133 your dependencies.][cargo/8062] E.g.
2135 mdbook v0.3.2 (/Users/src/rust/mdbook)
2137 │ ├── html5ever v0.24.0
2139 │ │ │ └── cfg-if v0.1.9
2141 │ │ └── markup5ever v0.9.0
2142 │ │ ├── log v0.4.8 (*)
2144 │ │ │ └── phf_shared v0.7.24
2145 │ │ │ ├── siphasher v0.2.3
2146 │ │ │ └── unicase v1.4.2
2147 │ │ │ [build-dependencies]
2148 │ │ │ └── version_check v0.1.5
2151 You can also display dependencies on multiple versions of the same crate with
2152 `cargo tree -d` (short for `cargo tree --duplicates`).
2156 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2157 the version in the sidebar.][69494]
2161 - [Rustc now correctly generates static libraries on Windows GNU targets with
2162 the `.a` extension, rather than the previous `.lib`.][70937]
2163 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2164 - [The `file_name` property in JSON output of macro errors now points the actual
2165 source file rather than the previous format of `<NAME macros>`.][70969]
2166 **Note:** this may not point to a file that actually exists on the user's system.
2167 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2168 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2169 not allow zero initialization such as `NonZeroU8`.][66059] This was
2170 previously a warning.
2171 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2172 operator has been defined as a saturating operation.][71269] This was previously
2173 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2174 continue using the current behaviour, which may be desirable in rare performance
2175 sensitive situations.
2179 These changes provide no direct user facing benefits, but represent significant
2180 improvements to the internals and overall performance of rustc and
2183 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2184 - [Replace big JS dict with JSON parsing.][71250]
2186 [69373]: https://github.com/rust-lang/rust/pull/69373/
2187 [66059]: https://github.com/rust-lang/rust/pull/66059/
2188 [68191]: https://github.com/rust-lang/rust/pull/68191/
2189 [68899]: https://github.com/rust-lang/rust/pull/68899/
2190 [71147]: https://github.com/rust-lang/rust/pull/71147/
2191 [71250]: https://github.com/rust-lang/rust/pull/71250/
2192 [70937]: https://github.com/rust-lang/rust/pull/70937/
2193 [70969]: https://github.com/rust-lang/rust/pull/70969/
2194 [70632]: https://github.com/rust-lang/rust/pull/70632/
2195 [70281]: https://github.com/rust-lang/rust/pull/70281/
2196 [70345]: https://github.com/rust-lang/rust/pull/70345/
2197 [70048]: https://github.com/rust-lang/rust/pull/70048/
2198 [70081]: https://github.com/rust-lang/rust/pull/70081/
2199 [70156]: https://github.com/rust-lang/rust/pull/70156/
2200 [71269]: https://github.com/rust-lang/rust/pull/71269/
2201 [69838]: https://github.com/rust-lang/rust/pull/69838/
2202 [69929]: https://github.com/rust-lang/rust/pull/69929/
2203 [69661]: https://github.com/rust-lang/rust/pull/69661/
2204 [69778]: https://github.com/rust-lang/rust/pull/69778/
2205 [69494]: https://github.com/rust-lang/rust/pull/69494/
2206 [69403]: https://github.com/rust-lang/rust/pull/69403/
2207 [69033]: https://github.com/rust-lang/rust/pull/69033/
2208 [68692]: https://github.com/rust-lang/rust/pull/68692/
2209 [68334]: https://github.com/rust-lang/rust/pull/68334/
2210 [67502]: https://github.com/rust-lang/rust/pull/67502/
2211 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2212 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2213 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2214 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2215 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2216 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2217 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2218 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2219 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2220 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2221 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2222 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2223 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2226 Version 1.43.1 (2020-05-07)
2227 ===========================
2229 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2230 * [Fixed the stabilization of AVX-512 features.][71473]
2231 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2233 [71430]: https://github.com/rust-lang/rust/pull/71430
2234 [71473]: https://github.com/rust-lang/rust/issues/71473
2235 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2238 Version 1.43.0 (2020-04-23)
2239 ==========================
2243 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2244 the type inferred correctly.][68129]
2245 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2247 **Syntax only changes**
2248 - [Allow `type Foo: Ord` syntactically.][69361]
2249 - [Fuse associated and extern items up to defaultness.][69194]
2250 - [Syntactically allow `self` in all `fn` contexts.][68764]
2251 - [Merge `fn` syntax + cleanup item parsing.][68728]
2252 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2253 For example, you may now write:
2255 macro_rules! mac_trait {
2265 These are still rejected *semantically*, so you will likely receive an error but
2266 these changes can be seen and parsed by macros and
2267 conditional compilation.
2272 - [You can now pass multiple lint flags to rustc to override the previous
2273 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2274 everything in the `unused` lint group except `unused-variables` which
2275 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2276 everything in the `unused` lint group **including** `unused-variables` since
2277 the allow flag is specified before the deny flag (and therefore overridden).
2278 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2279 if they are available on `windows-gnu`.][67429]
2280 - [rustc now buffers errors/warnings printed in JSON.][69227]
2284 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2285 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2286 respectively.][69538] **Note** These conversions are only available when `N`
2288 - [You can now use associated constants on floats and integers directly, rather
2289 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2290 `f32::NAN` with no imports.
2291 - [`u8::is_ascii` is now `const`.][68984]
2292 - [`String` now implements `AsMut<str>`.][68742]
2293 - [Added the `primitive` module to `std` and `core`.][67637] This module
2294 reexports Rust's primitive types. This is mainly useful in macros
2295 where you want avoid these types being shadowed.
2296 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2297 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2301 - [`Once::is_completed`]
2306 - [`iter::once_with`]
2310 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2311 your environment.][cargo/7823]
2312 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2313 executable path when running integration tests or benchmarks.][cargo/7697]
2314 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2315 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2319 - [Certain checks in the `const_err` lint were deemed unrelated to const
2320 evaluation][69185], and have been moved to the `unconditional_panic` and
2321 `arithmetic_overflow` lints.
2326 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2327 has been a warning since 1.36.0.
2328 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2329 led to some instances being accepted, and now correctly emits a hard error.
2331 [69340]: https://github.com/rust-lang/rust/pull/69340
2335 These changes provide no direct user facing benefits, but represent significant
2336 improvements to the internals and overall performance of `rustc` and
2339 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2340 - [Improved how rustc generates drop code.][67332]
2341 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2342 - [traits: preallocate 2 Vecs of known initial size][69022]
2343 - [Avoid exponential behaviour when relating types][68772]
2344 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2345 - [Improve performance of coherence checks][68966]
2346 - [Deduplicate types in the generator witness][68672]
2347 - [Invert control in struct_lint_level.][68725]
2349 [67332]: https://github.com/rust-lang/rust/pull/67332/
2350 [67429]: https://github.com/rust-lang/rust/pull/67429/
2351 [67637]: https://github.com/rust-lang/rust/pull/67637/
2352 [67642]: https://github.com/rust-lang/rust/pull/67642/
2353 [67878]: https://github.com/rust-lang/rust/pull/67878/
2354 [67885]: https://github.com/rust-lang/rust/pull/67885/
2355 [68129]: https://github.com/rust-lang/rust/pull/68129/
2356 [68672]: https://github.com/rust-lang/rust/pull/68672/
2357 [68725]: https://github.com/rust-lang/rust/pull/68725/
2358 [68728]: https://github.com/rust-lang/rust/pull/68728/
2359 [68738]: https://github.com/rust-lang/rust/pull/68738/
2360 [68742]: https://github.com/rust-lang/rust/pull/68742/
2361 [68764]: https://github.com/rust-lang/rust/pull/68764/
2362 [68772]: https://github.com/rust-lang/rust/pull/68772/
2363 [68943]: https://github.com/rust-lang/rust/pull/68943/
2364 [68952]: https://github.com/rust-lang/rust/pull/68952/
2365 [68966]: https://github.com/rust-lang/rust/pull/68966/
2366 [68984]: https://github.com/rust-lang/rust/pull/68984/
2367 [69022]: https://github.com/rust-lang/rust/pull/69022/
2368 [69185]: https://github.com/rust-lang/rust/pull/69185/
2369 [69194]: https://github.com/rust-lang/rust/pull/69194/
2370 [69201]: https://github.com/rust-lang/rust/pull/69201/
2371 [69227]: https://github.com/rust-lang/rust/pull/69227/
2372 [69548]: https://github.com/rust-lang/rust/pull/69548/
2373 [69256]: https://github.com/rust-lang/rust/pull/69256/
2374 [69361]: https://github.com/rust-lang/rust/pull/69361/
2375 [69366]: https://github.com/rust-lang/rust/pull/69366/
2376 [69538]: https://github.com/rust-lang/rust/pull/69538/
2377 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2378 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2379 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2380 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2381 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2382 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2383 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2384 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2387 Version 1.42.0 (2020-03-12)
2388 ==========================
2392 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2394 fn foo(words: &[&str]) {
2396 ["Hello", "World", "!", ..] => println!("Hello World!"),
2397 ["Foo", "Bar", ..] => println!("Baz"),
2398 rest => println!("{:?}", rest),
2402 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2403 that you can create an enum that has the exact layout and ABI of the type
2405 - [You can now use outer attribute procedural macros on inline modules.][64273]
2406 - [There are some *syntax-only* changes:][67131]
2407 - `default` is syntactically allowed before items in `trait` definitions.
2408 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2409 leave out their bodies in favor of `;`.
2410 - Bounds on associated types in `impl`s are now syntactically allowed
2411 (e.g. `type Foo: Ord;`).
2412 - `...` (the C-variadic type) may occur syntactically directly as the type of
2413 any function parameter.
2415 These are still rejected *semantically*, so you will likely receive an error
2416 but these changes can be seen and parsed by procedural macros and
2417 conditional compilation.
2421 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2422 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2423 - [`Option::{expect,unwrap}` and
2424 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2425 pointing to the location where they were called, rather than
2426 `core`'s internals. ][67887]
2428 \* Refer to Rust's [platform support page][platform-support-doc] for more
2429 information on Rust's tiered platform support.
2433 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2434 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2435 to implement `Sized`.][67935]
2436 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2437 - [`Layout::new` is now `const`.][66254]
2438 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2443 - [`CondVar::wait_while`]
2444 - [`CondVar::wait_timeout_while`]
2446 - [`DebugMap::value`]
2447 - [`ManuallyDrop::take`]
2449 - [`ptr::slice_from_raw_parts_mut`]
2450 - [`ptr::slice_from_raw_parts`]
2454 - [You no longer need to include `extern crate proc_macro;` to be able to
2455 `use proc_macro;` in the `2018` edition.][cargo/7700]
2459 - [`Error::description` has been deprecated, and its use will now produce a
2460 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2462 [68253]: https://github.com/rust-lang/rust/pull/68253/
2463 [68348]: https://github.com/rust-lang/rust/pull/68348/
2464 [67935]: https://github.com/rust-lang/rust/pull/67935/
2465 [68339]: https://github.com/rust-lang/rust/pull/68339/
2466 [68122]: https://github.com/rust-lang/rust/pull/68122/
2467 [64273]: https://github.com/rust-lang/rust/pull/64273/
2468 [67712]: https://github.com/rust-lang/rust/pull/67712/
2469 [67887]: https://github.com/rust-lang/rust/pull/67887/
2470 [67131]: https://github.com/rust-lang/rust/pull/67131/
2471 [67233]: https://github.com/rust-lang/rust/pull/67233/
2472 [66899]: https://github.com/rust-lang/rust/pull/66899/
2473 [66919]: https://github.com/rust-lang/rust/pull/66919/
2474 [66254]: https://github.com/rust-lang/rust/pull/66254/
2475 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2476 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2477 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2478 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2479 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2480 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2481 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2482 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2483 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2486 Version 1.41.1 (2020-02-27)
2487 ===========================
2489 * [Always check types of static items][69145]
2490 * [Always check lifetime bounds of `Copy` impls][69145]
2491 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2493 [69225]: https://github.com/rust-lang/rust/issues/69225
2494 [69145]: https://github.com/rust-lang/rust/pull/69145
2497 Version 1.41.0 (2020-01-30)
2498 ===========================
2503 - [You can now pass type parameters to foreign items when implementing
2504 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2505 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2506 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2507 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2508 - [You can now use any valid identifier in a `format_args` macro.][66847]
2509 Previously identifiers starting with an underscore were not allowed.
2510 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2511 enum variants.][66183] These are still rejected semantically, but
2512 can be seen and parsed by procedural macros and conditional compilation.
2513 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2514 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2515 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2517 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2522 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2523 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2524 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2525 - [You can now pass an arguments file passing the `@path` syntax
2526 to rustc.][66172] Note that the format differs somewhat from what is
2527 found in other tooling; please see [the documentation][argfile-docs] for
2529 - [You can now provide `--extern` flag without a path, indicating that it is
2530 available from the search path or specified with an `-L` flag.][64882]
2532 \* Refer to Rust's [platform support page][platform-support-doc] for more
2533 information on Rust's tiered platform support.
2535 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2540 - [The `core::panic` module is now stable.][66771] It was already stable
2542 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2543 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2544 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2549 - [`Result::map_or`]
2550 - [`Result::map_or_else`]
2551 - [`std::rc::Weak::weak_count`]
2552 - [`std::rc::Weak::strong_count`]
2553 - [`std::sync::Weak::weak_count`]
2554 - [`std::sync::Weak::strong_count`]
2559 - [Cargo will now document all the private items for binary crates
2560 by default.][cargo/7593]
2561 - [`cargo-install` will now reinstall the package if it detects that it is out
2562 of date.][cargo/7560]
2563 - [Cargo.lock now uses a more git friendly format that should help to reduce
2564 merge conflicts.][cargo/7579]
2565 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2566 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2567 optimisation level to `2` for debug builds. You can also use
2568 `[profile.<profile>.build-override]` to override build scripts and
2574 - [You can now specify `edition` in documentation code blocks to compile the block
2575 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2576 should be compiled the 2018 edition of Rust.
2577 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2578 current theme with `--check-theme`.][54733]
2579 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2584 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2585 Apple targets.][apple-32bit-drop] This means that the source code is still
2586 available to build, but the targets are no longer being tested and release
2587 binaries for those platforms will no longer be distributed by the Rust project.
2588 Please refer to the linked blog post for more information.
2590 [54733]: https://github.com/rust-lang/rust/pull/54733/
2591 [61351]: https://github.com/rust-lang/rust/pull/61351/
2592 [62514]: https://github.com/rust-lang/rust/pull/62514/
2593 [67255]: https://github.com/rust-lang/rust/pull/67255/
2594 [66661]: https://github.com/rust-lang/rust/pull/66661/
2595 [66771]: https://github.com/rust-lang/rust/pull/66771/
2596 [66847]: https://github.com/rust-lang/rust/pull/66847/
2597 [66238]: https://github.com/rust-lang/rust/pull/66238/
2598 [66277]: https://github.com/rust-lang/rust/pull/66277/
2599 [66325]: https://github.com/rust-lang/rust/pull/66325/
2600 [66172]: https://github.com/rust-lang/rust/pull/66172/
2601 [66183]: https://github.com/rust-lang/rust/pull/66183/
2602 [65879]: https://github.com/rust-lang/rust/pull/65879/
2603 [65013]: https://github.com/rust-lang/rust/pull/65013/
2604 [64882]: https://github.com/rust-lang/rust/pull/64882/
2605 [64325]: https://github.com/rust-lang/rust/pull/64325/
2606 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2607 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2608 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2609 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2610 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2611 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2612 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2613 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2614 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2615 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2616 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2618 Version 1.40.0 (2019-12-19)
2619 ===========================
2623 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2624 `const` contexts.][65188] e.g.
2627 pub struct Point(i32, i32);
2629 const ORIGIN: Point = {
2630 let constructor = Point;
2636 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2637 indicate that there may be variants or fields added in the future.][64639]
2638 For example this requires adding a wild-card branch (`_ => {}`) to any match
2639 statements on a non-exhaustive `enum`. [(RFC 2008)]
2640 - [You can now use function-like procedural macros in `extern` blocks and in
2641 type positions.][63931] e.g. `type Generated = macro!();`
2642 - [Function-like and attribute procedural macros can now emit
2643 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2644 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2645 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2646 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2650 - [Added tier 3 support\* for the
2651 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2652 - [Added tier 3 support for the
2653 `aarch64-unknown-none-softfloat` target.][64589]
2654 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2655 `mips64el-unknown-linux-muslabi64` targets.][65843]
2657 \* Refer to Rust's [platform support page][platform-support-doc] for more
2658 information on Rust's tiered platform support.
2662 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2666 - [`BTreeMap::get_key_value`]
2667 - [`HashMap::get_key_value`]
2668 - [`Option::as_deref_mut`]
2669 - [`Option::as_deref`]
2670 - [`Option::flatten`]
2671 - [`UdpSocket::peer_addr`]
2672 - [`f32::to_be_bytes`]
2673 - [`f32::to_le_bytes`]
2674 - [`f32::to_ne_bytes`]
2675 - [`f64::to_be_bytes`]
2676 - [`f64::to_le_bytes`]
2677 - [`f64::to_ne_bytes`]
2678 - [`f32::from_be_bytes`]
2679 - [`f32::from_le_bytes`]
2680 - [`f32::from_ne_bytes`]
2681 - [`f64::from_be_bytes`]
2682 - [`f64::from_le_bytes`]
2683 - [`f64::from_ne_bytes`]
2690 - [Cargo will now always display warnings, rather than only on
2691 fresh builds.][cargo/7450]
2692 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2693 now produce an error.][cargo/7507] Previously these flags were ignored.
2694 - [You can now publish `dev-dependencies` without including
2695 a `version`.][cargo/7333]
2699 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2700 when running documentation tests with `rustdoc`.][63803]
2704 - [As previously announced, any previous NLL warnings in the 2015 edition are
2705 now hard errors.][64221]
2706 - [The `include!` macro will now warn if it failed to include the
2707 entire file.][64284] The `include!` macro unintentionally only includes the
2708 first _expression_ in a file, and this can be unintuitive. This will become
2709 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2710 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2711 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2712 or `extern` blocks now correctly emits a hard error.
2714 [65294]: https://github.com/rust-lang/rust/pull/65294/
2715 [66103]: https://github.com/rust-lang/rust/pull/66103/
2716 [65843]: https://github.com/rust-lang/rust/pull/65843/
2717 [65188]: https://github.com/rust-lang/rust/pull/65188/
2718 [65092]: https://github.com/rust-lang/rust/pull/65092/
2719 [64589]: https://github.com/rust-lang/rust/pull/64589/
2720 [64639]: https://github.com/rust-lang/rust/pull/64639/
2721 [64221]: https://github.com/rust-lang/rust/pull/64221/
2722 [64284]: https://github.com/rust-lang/rust/pull/64284/
2723 [63931]: https://github.com/rust-lang/rust/pull/63931/
2724 [64035]: https://github.com/rust-lang/rust/pull/64035/
2725 [63674]: https://github.com/rust-lang/rust/pull/63674/
2726 [63803]: https://github.com/rust-lang/rust/pull/63803/
2727 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2728 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2729 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2730 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2731 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2732 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2733 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2734 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2735 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2736 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2737 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2738 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2739 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2740 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2741 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2742 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2743 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2744 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2745 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2746 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2747 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2748 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2749 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2750 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2751 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2754 Version 1.39.0 (2019-11-07)
2755 ===========================
2759 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2760 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2761 - [You can now use certain attributes on function, closure, and function pointer
2762 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2763 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2764 attributes applied to items. e.g.
2767 #[cfg(windows)] slice: &[u16],
2768 #[cfg(not(windows))] slice: &[u8],
2773 - [You can now take shared references to bind-by-move patterns in the `if` guards
2774 of `match` arms.][63118] e.g.
2777 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2781 // ---- `nums` is bound by move.
2782 if nums.iter().sum::<u8>() == 10
2783 // ^------ `.iter()` implicitly takes a reference to `nums`.
2786 // ----------- Legal as `nums` was bound by move and so we have ownership.
2788 _ => unreachable!(),
2797 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
2798 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
2799 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
2800 **Note** Cargo currently doesn't use this feature. Refer to
2801 [cargo#7315][cargo/7315] to track this feature's progress.
2802 - [You can now pass `--show-output` argument to test binaries to print the
2803 output of successful tests.][62600]
2806 \* Refer to Rust's [platform support page][platform-support-doc] for more
2807 information on Rust's tiered platform support.
2811 - [`Vec::new` and `String::new` are now `const` functions.][64028]
2812 - [`LinkedList::new` is now a `const` function.][63684]
2813 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
2814 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
2815 now `const`.][63786]
2819 - [`Pin::into_inner`]
2820 - [`Instant::checked_duration_since`]
2821 - [`Instant::saturating_duration_since`]
2825 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
2826 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
2827 `--all` is now deprecated.
2831 - [You can now pass `-Clinker` to rustdoc to control the linker used
2832 for compiling doctests.][63834]
2836 - [Code that was previously accepted by the old borrow checker, but rejected by
2837 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
2838 previously a warning, and will also become a hard error in the Rust 2015
2839 edition in the 1.40.0 release.
2840 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
2841 run tests.][63827] This should improve performance when running a large
2843 - [The `try!` macro will now issue a deprecation warning.][62672] It is
2844 recommended to use the `?` operator instead.
2845 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
2848 [62600]: https://github.com/rust-lang/rust/pull/62600/
2849 [62672]: https://github.com/rust-lang/rust/pull/62672/
2850 [63118]: https://github.com/rust-lang/rust/pull/63118/
2851 [63209]: https://github.com/rust-lang/rust/pull/63209/
2852 [63402]: https://github.com/rust-lang/rust/pull/63402/
2853 [63565]: https://github.com/rust-lang/rust/pull/63565/
2854 [63595]: https://github.com/rust-lang/rust/pull/63595/
2855 [63684]: https://github.com/rust-lang/rust/pull/63684/
2856 [63698]: https://github.com/rust-lang/rust/pull/63698/
2857 [63770]: https://github.com/rust-lang/rust/pull/63770/
2858 [63786]: https://github.com/rust-lang/rust/pull/63786/
2859 [63827]: https://github.com/rust-lang/rust/pull/63827/
2860 [63834]: https://github.com/rust-lang/rust/pull/63834/
2861 [64010]: https://github.com/rust-lang/rust/pull/64010/
2862 [64028]: https://github.com/rust-lang/rust/pull/64028/
2863 [64334]: https://github.com/rust-lang/rust/pull/64334/
2864 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
2865 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
2866 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
2867 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
2868 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
2869 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
2871 Version 1.38.0 (2019-09-26)
2872 ==========================
2876 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
2877 - [The `#[deprecated]` attribute can now be used on macros.][62042]
2881 - [Added pipelined compilation support to `rustc`.][62766] This will
2882 improve compilation times in some cases. For further information please refer
2883 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
2884 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
2885 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
2886 `x86_64-uwp-windows-msvc` targets.][60260]
2887 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
2888 `armv7-unknown-linux-musleabi` targets.][63107]
2889 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
2890 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
2891 - [Upgraded to LLVM 9.][62592]
2893 \* Refer to Rust's [platform support page][platform-support-doc] for more
2894 information on Rust's tiered platform support.
2898 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
2899 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
2900 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
2901 is available at `std::clone::Clone`). This also makes all built-in macros
2902 available in `std`/`core` root. e.g. `std::include_bytes!`.
2903 - [`str::Chars` now implements `Debug`.][63000]
2904 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
2905 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
2906 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
2907 - [Added euclidean remainder and division operations (`div_euclid`,
2908 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
2909 `overflowing`, and `wrapping` versions are available for all
2911 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
2912 `PartialEq`.][61491]
2913 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
2917 - [`<*const T>::cast`]
2918 - [`<*mut T>::cast`]
2919 - [`Duration::as_secs_f32`]
2920 - [`Duration::as_secs_f64`]
2921 - [`Duration::div_f32`]
2922 - [`Duration::div_f64`]
2923 - [`Duration::from_secs_f32`]
2924 - [`Duration::from_secs_f64`]
2925 - [`Duration::mul_f32`]
2926 - [`Duration::mul_f64`]
2927 - [`any::type_name`]
2931 - [Added pipelined compilation support to `cargo`.][cargo/7143]
2932 - [You can now pass the `--features` option multiple times to enable
2933 multiple features.][cargo/7084]
2938 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
2942 - [`rustc` will now warn about some incorrect uses of
2943 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
2947 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
2949 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
2950 issues][62896] with certain crates such as libc.
2952 [60260]: https://github.com/rust-lang/rust/pull/60260/
2953 [61457]: https://github.com/rust-lang/rust/pull/61457/
2954 [61491]: https://github.com/rust-lang/rust/pull/61491/
2955 [61884]: https://github.com/rust-lang/rust/pull/61884/
2956 [61953]: https://github.com/rust-lang/rust/pull/61953/
2957 [62042]: https://github.com/rust-lang/rust/pull/62042/
2958 [62528]: https://github.com/rust-lang/rust/pull/62528/
2959 [62583]: https://github.com/rust-lang/rust/pull/62583/
2960 [62735]: https://github.com/rust-lang/rust/pull/62735/
2961 [62766]: https://github.com/rust-lang/rust/pull/62766/
2962 [62784]: https://github.com/rust-lang/rust/pull/62784/
2963 [62592]: https://github.com/rust-lang/rust/pull/62592/
2964 [62785]: https://github.com/rust-lang/rust/issues/62785/
2965 [62814]: https://github.com/rust-lang/rust/pull/62814/
2966 [62896]: https://github.com/rust-lang/rust/issues/62896/
2967 [63000]: https://github.com/rust-lang/rust/pull/63000/
2968 [63056]: https://github.com/rust-lang/rust/pull/63056/
2969 [63107]: https://github.com/rust-lang/rust/pull/63107/
2970 [63346]: https://github.com/rust-lang/rust/pull/63346/
2971 [63421]: https://github.com/rust-lang/rust/pull/63421/
2972 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
2973 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
2974 [63048]: https://github.com/rust-lang/rust/pull/63048
2975 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2976 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
2977 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
2978 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
2979 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
2980 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
2981 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
2982 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
2983 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
2984 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
2985 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
2986 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
2987 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
2989 Version 1.37.0 (2019-08-15)
2990 ==========================
2994 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
2995 [`Box`][62228], or an [array][62235] and unused.
2996 - [You can now use the `cfg` and `cfg_attr` attributes on
2997 generic parameters.][61547]
2998 - [You can now use enum variants through type alias.][61682] e.g. You can
2999 write the following:
3001 type MyOption = Option<u8>;
3003 fn increment_or_zero(x: MyOption) -> u8 {
3005 MyOption::Some(y) => y + 1,
3006 MyOption::None => 0,
3010 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3011 `const _: u32 = 5;`.
3012 - [You can now use `#[repr(align(X)]` on enums.][61229]
3013 - [The `?` Kleene macro operator is now available in the
3014 2015 edition.][60932]
3018 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3019 and `-C profile-use` flags.][61268] For more information on how to use profile
3020 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3021 - [The `rust-lldb` wrapper script should now work again.][61827]
3025 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3029 - [`BufReader::buffer`]
3030 - [`BufWriter::buffer`]
3031 - [`Cell::from_mut`]
3032 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3033 - [`DoubleEndedIterator::nth_back`]
3035 - [`Wrapping::reverse_bits`]
3036 - [`i128::reverse_bits`]
3037 - [`i16::reverse_bits`]
3038 - [`i32::reverse_bits`]
3039 - [`i64::reverse_bits`]
3040 - [`i8::reverse_bits`]
3041 - [`isize::reverse_bits`]
3042 - [`slice::copy_within`]
3043 - [`u128::reverse_bits`]
3044 - [`u16::reverse_bits`]
3045 - [`u32::reverse_bits`]
3046 - [`u64::reverse_bits`]
3047 - [`u8::reverse_bits`]
3048 - [`usize::reverse_bits`]
3052 - [`Cargo.lock` files are now included by default when publishing executable crates
3053 with executables.][cargo/7026]
3054 - [You can now specify `default-run="foo"` in `[package]` to specify the
3055 default executable to use for `cargo run`.][cargo/7056]
3062 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3063 Please transition your code to using the `..=` syntax for inclusive
3065 - [Using a trait object without the `dyn` will now warn by default.][61203]
3066 Please transition your code to use `dyn Trait` for trait objects instead.
3068 [62228]: https://github.com/rust-lang/rust/pull/62228/
3069 [62235]: https://github.com/rust-lang/rust/pull/62235/
3070 [61802]: https://github.com/rust-lang/rust/pull/61802/
3071 [61827]: https://github.com/rust-lang/rust/pull/61827/
3072 [61547]: https://github.com/rust-lang/rust/pull/61547/
3073 [61682]: https://github.com/rust-lang/rust/pull/61682/
3074 [61268]: https://github.com/rust-lang/rust/pull/61268/
3075 [61342]: https://github.com/rust-lang/rust/pull/61342/
3076 [61347]: https://github.com/rust-lang/rust/pull/61347/
3077 [61100]: https://github.com/rust-lang/rust/pull/61100/
3078 [61203]: https://github.com/rust-lang/rust/pull/61203/
3079 [61229]: https://github.com/rust-lang/rust/pull/61229/
3080 [60932]: https://github.com/rust-lang/rust/pull/60932/
3081 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3082 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3083 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3084 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3085 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3086 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3087 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3088 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3089 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3090 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3091 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3092 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3093 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3094 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3095 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3096 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3097 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3098 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3099 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3100 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3101 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3102 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3103 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3106 Version 1.36.0 (2019-07-04)
3107 ==========================
3111 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3112 - [The order of traits in trait objects no longer affects the semantics of that
3113 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3114 `dyn fmt::Debug + Send`, where this was previously not the case.
3118 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3119 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3120 - [`mem::needs_drop` is now available as a const fn.][60364]
3121 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3122 - [`String` now implements `BorrowMut<str>`.][60404]
3123 - [`io::Cursor` now implements `Default`.][60234]
3124 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3125 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3126 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3127 environment has access to heap memory allocation.
3128 - [`String` now implements `From<&String>`.][59825]
3129 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3130 return a tuple of each argument when there is multiple arguments.
3131 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3136 - [`VecDeque::rotate_left`]
3137 - [`VecDeque::rotate_right`]
3138 - [`Iterator::copied`]
3140 - [`io::IoSliceMut`]
3141 - [`Read::read_vectored`]
3142 - [`Write::write_vectored`]
3143 - [`str::as_mut_ptr`]
3144 - [`mem::MaybeUninit`]
3145 - [`pointer::align_offset`]
3146 - [`future::Future`]
3148 - [`task::RawWaker`]
3149 - [`task::RawWakerVTable`]
3155 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3156 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3158 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3162 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3169 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3170 longer recommended, and will be deprecated in 1.39.0.
3172 [60318]: https://github.com/rust-lang/rust/pull/60318/
3173 [60364]: https://github.com/rust-lang/rust/pull/60364/
3174 [60370]: https://github.com/rust-lang/rust/pull/60370/
3175 [60404]: https://github.com/rust-lang/rust/pull/60404/
3176 [60234]: https://github.com/rust-lang/rust/pull/60234/
3177 [60244]: https://github.com/rust-lang/rust/pull/60244/
3178 [58623]: https://github.com/rust-lang/rust/pull/58623/
3179 [59648]: https://github.com/rust-lang/rust/pull/59648/
3180 [59675]: https://github.com/rust-lang/rust/pull/59675/
3181 [59825]: https://github.com/rust-lang/rust/pull/59825/
3182 [59826]: https://github.com/rust-lang/rust/pull/59826/
3183 [59445]: https://github.com/rust-lang/rust/pull/59445/
3184 [59114]: https://github.com/rust-lang/rust/pull/59114/
3185 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3186 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3187 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3188 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3189 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3190 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3191 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3192 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3193 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3194 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3195 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3196 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3197 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3198 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3199 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3200 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3201 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3202 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3203 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3204 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3207 Version 1.35.0 (2019-05-23)
3208 ==========================
3212 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3213 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3214 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3216 unsafe fn call_unsafe(func: unsafe fn()) {
3221 unsafe { call_unsafe(|| {}); }
3228 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3229 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3230 - [Added the `wasm32-unknown-wasi` target.][59464]
3235 - [`Thread` will now show its ID in `Debug` output.][59460]
3236 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3237 - [`alloc::System` now implements `Default`.][59451]
3238 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3240 - [`char::{ToLowercase, ToUppercase}` now
3241 implement `ExactSizeIterator`.][58778]
3242 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3243 - [Removed the `Read` trait bounds
3244 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3245 - [You can now call the `dbg!` macro without any parameters to print the file
3246 and line where it is called.][57847]
3247 - [In place ASCII case conversions are now up to 4× faster.][59283]
3248 e.g. `str::make_ascii_lowercase`
3249 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3256 - [`RefCell::replace_with`]
3257 - [`RefCell::map_split`]
3259 - [`Range::contains`]
3260 - [`RangeFrom::contains`]
3261 - [`RangeTo::contains`]
3262 - [`RangeInclusive::contains`]
3263 - [`RangeToInclusive::contains`]
3264 - [`Option::copied`]
3268 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3269 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3274 - [The Rust toolchain is now available natively for musl based distros.][58575]
3276 [59460]: https://github.com/rust-lang/rust/pull/59460/
3277 [59464]: https://github.com/rust-lang/rust/pull/59464/
3278 [59500]: https://github.com/rust-lang/rust/pull/59500/
3279 [59512]: https://github.com/rust-lang/rust/pull/59512/
3280 [59580]: https://github.com/rust-lang/rust/pull/59580/
3281 [59283]: https://github.com/rust-lang/rust/pull/59283/
3282 [59451]: https://github.com/rust-lang/rust/pull/59451/
3283 [59076]: https://github.com/rust-lang/rust/pull/59076/
3284 [58778]: https://github.com/rust-lang/rust/pull/58778/
3285 [58717]: https://github.com/rust-lang/rust/pull/58717/
3286 [58369]: https://github.com/rust-lang/rust/pull/58369/
3287 [58423]: https://github.com/rust-lang/rust/pull/58423/
3288 [58080]: https://github.com/rust-lang/rust/pull/58080/
3289 [57847]: https://github.com/rust-lang/rust/pull/57847/
3290 [58575]: https://github.com/rust-lang/rust/pull/58575
3291 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3292 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3293 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3294 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3295 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3296 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3297 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3298 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3299 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3300 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3301 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3302 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3304 Version 1.34.2 (2019-05-14)
3305 ===========================
3307 * [Destabilize the `Error::type_id` function due to a security
3308 vulnerability][60785] ([CVE-2019-12083])
3310 [60785]: https://github.com/rust-lang/rust/pull/60785
3311 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3313 Version 1.34.1 (2019-04-25)
3314 ===========================
3316 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3317 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3318 * [Fix Clippy panic when checking some macros][clippy/3805]
3320 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3321 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3322 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3324 Version 1.34.0 (2019-04-11)
3325 ==========================
3329 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3330 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3332 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3333 `#[attr{}]` procedural macros.][57367]
3334 - [You can now write `extern crate self as foo;`][57407] to import your
3335 crate's root into the extern prelude.
3340 - [You can now target `riscv64imac-unknown-none-elf` and
3341 `riscv64gc-unknown-none-elf`.][58406]
3342 - [You can now enable linker plugin LTO optimisations with
3343 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3344 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3346 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3351 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3352 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3353 the `Hash` trait to create an iterator.
3354 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3355 methods.][58421] Most notably you no longer require the `Ord` trait to create
3357 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3358 for all numeric types.][58044]
3359 - [Indexing a `str` is now generic over all types that
3360 implement `SliceIndex<str>`.][57604]
3361 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3362 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3363 produce a warning if their returning type is unused.
3364 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3365 `overflowing_pow` are now available for all numeric types.][57873] These are
3366 equivalent to methods such as `wrapping_add` for the `pow` operation.
3374 * [`Error::type_id`]
3375 * [`atomic::AtomicI16`]
3376 * [`atomic::AtomicI32`]
3377 * [`atomic::AtomicI64`]
3378 * [`atomic::AtomicI8`]
3379 * [`atomic::AtomicU16`]
3380 * [`atomic::AtomicU32`]
3381 * [`atomic::AtomicU64`]
3382 * [`atomic::AtomicU8`]
3383 * [`convert::Infallible`]
3384 * [`convert::TryFrom`]
3385 * [`convert::TryInto`]
3387 * [`iter::successors`]
3388 * [`num::NonZeroI128`]
3389 * [`num::NonZeroI16`]
3390 * [`num::NonZeroI32`]
3391 * [`num::NonZeroI64`]
3392 * [`num::NonZeroI8`]
3393 * [`num::NonZeroIsize`]
3394 * [`slice::sort_by_cached_key`]
3395 * [`str::escape_debug`]
3396 * [`str::escape_default`]
3397 * [`str::escape_unicode`]
3398 * [`str::split_ascii_whitespace`]
3401 * [`Instant::checked_add`]
3402 * [`Instant::checked_sub`]
3403 * [`SystemTime::checked_add`]
3404 * [`SystemTime::checked_sub`]
3408 - [You can now use alternative registries to crates.io.][cargo/6654]
3412 - [You can now use the `?` operator in your documentation tests without manually
3413 adding `fn main() -> Result<(), _> {}`.][56470]
3417 - [`Command::before_exec` is being replaced by the unsafe method
3418 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3419 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3420 can now use `const` functions in `static` variables.
3422 [58370]: https://github.com/rust-lang/rust/pull/58370/
3423 [58406]: https://github.com/rust-lang/rust/pull/58406/
3424 [58421]: https://github.com/rust-lang/rust/pull/58421/
3425 [58166]: https://github.com/rust-lang/rust/pull/58166/
3426 [58044]: https://github.com/rust-lang/rust/pull/58044/
3427 [58057]: https://github.com/rust-lang/rust/pull/58057/
3428 [58059]: https://github.com/rust-lang/rust/pull/58059/
3429 [57809]: https://github.com/rust-lang/rust/pull/57809/
3430 [57873]: https://github.com/rust-lang/rust/pull/57873/
3431 [57604]: https://github.com/rust-lang/rust/pull/57604/
3432 [57367]: https://github.com/rust-lang/rust/pull/57367/
3433 [57407]: https://github.com/rust-lang/rust/pull/57407/
3434 [57425]: https://github.com/rust-lang/rust/pull/57425/
3435 [57106]: https://github.com/rust-lang/rust/pull/57106/
3436 [56470]: https://github.com/rust-lang/rust/pull/56470/
3437 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3438 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3439 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3440 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3441 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3442 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3443 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3444 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3445 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3446 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3447 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3448 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3449 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3450 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3451 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3452 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3453 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3454 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3455 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3456 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3457 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3458 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3459 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3460 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3461 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3462 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3463 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3464 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3465 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3466 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3467 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3470 Version 1.33.0 (2019-02-28)
3471 ==========================
3475 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3476 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3477 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3478 E.g. You can have match statement on a `u8` that covers `0..=255` and
3479 you would no longer be required to have a `_ => unreachable!()` case.
3480 - [You can now have multiple patterns in `if let` and `while let`
3481 expressions.][57532] You can do this with the same syntax as a `match`
3491 let state = Creature::Crab("Ferris");
3493 if let Creature::Crab(name) | Creature::Person(name) = state {
3494 println!("This creature's name is: {}", name);
3498 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3499 this feature will by default produce a warning as this behaviour can be
3500 unintuitive. E.g. `if let _ = 5 {}`
3501 - [You can now use `let` bindings, assignments, expression statements,
3502 and irrefutable pattern destructuring in const functions.][57175]
3503 - [You can now call unsafe const functions.][57067] E.g.
3505 const unsafe fn foo() -> i32 { 5 }
3506 const fn bar() -> i32 {
3510 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3511 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3512 - [You can now specify a specific alignment with the `#[repr(packed)]`
3513 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3514 with an alignment of 2 bytes and a size of 6 bytes.
3515 - [You can now import an item from a module as an `_`.][56303] This allows you to
3516 import a trait's impls, and not have the name in the namespace. E.g.
3518 use std::io::Read as _;
3520 // Allowed as there is only one `Read` in the module.
3523 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3527 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3528 command line argument.][56351]
3529 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3530 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3531 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3532 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3533 information on Rust's platform support.
3534 - [Added support for the `thumbv7neon-linux-androideabi` and
3535 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3536 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3540 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3541 functions for all numeric types.][57566]
3542 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3543 are now `const` functions for all numeric types.][57105]
3544 - [The methods `is_positive` and `is_negative` are now `const` functions for
3545 all signed numeric types.][57105]
3546 - [The `get` method for all `NonZero` types is now `const`.][57167]
3547 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3548 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3549 numeric types.][57234]
3550 - [`Ipv4Addr::new` is now a `const` function][57234]
3554 - [`unix::FileExt::read_exact_at`]
3555 - [`unix::FileExt::write_all_at`]
3556 - [`Option::transpose`]
3557 - [`Result::transpose`]
3558 - [`convert::identity`]
3561 - [`marker::PhantomPinned`]
3562 - [`Vec::resize_with`]
3563 - [`VecDeque::resize_with`]
3564 - [`Duration::as_millis`]
3565 - [`Duration::as_micros`]
3566 - [`Duration::as_nanos`]
3571 - [You can now publish crates that require a feature flag to compile with
3572 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3573 - [Cargo should now rebuild a crate if a file was modified during the initial
3578 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3579 are now deprecated in the standard library, and their usage will now produce a warning.
3580 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3582 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3584 - [Libtest no longer creates a new thread for each test when
3585 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3587 [56243]: https://github.com/rust-lang/rust/pull/56243
3588 [56303]: https://github.com/rust-lang/rust/pull/56303/
3589 [56351]: https://github.com/rust-lang/rust/pull/56351/
3590 [56362]: https://github.com/rust-lang/rust/pull/56362
3591 [56642]: https://github.com/rust-lang/rust/pull/56642/
3592 [56769]: https://github.com/rust-lang/rust/pull/56769/
3593 [56805]: https://github.com/rust-lang/rust/pull/56805
3594 [56947]: https://github.com/rust-lang/rust/pull/56947/
3595 [57049]: https://github.com/rust-lang/rust/pull/57049/
3596 [57067]: https://github.com/rust-lang/rust/pull/57067/
3597 [57105]: https://github.com/rust-lang/rust/pull/57105
3598 [57130]: https://github.com/rust-lang/rust/pull/57130/
3599 [57167]: https://github.com/rust-lang/rust/pull/57167/
3600 [57175]: https://github.com/rust-lang/rust/pull/57175/
3601 [57234]: https://github.com/rust-lang/rust/pull/57234/
3602 [57332]: https://github.com/rust-lang/rust/pull/57332/
3603 [57465]: https://github.com/rust-lang/rust/pull/57465/
3604 [57532]: https://github.com/rust-lang/rust/pull/57532/
3605 [57535]: https://github.com/rust-lang/rust/pull/57535/
3606 [57566]: https://github.com/rust-lang/rust/pull/57566/
3607 [57615]: https://github.com/rust-lang/rust/pull/57615/
3608 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3609 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3610 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3611 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3612 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3613 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3614 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3615 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3616 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3617 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3618 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3619 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3620 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3621 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3622 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3623 [platform-support]: https://forge.rust-lang.org/platform-support.html
3625 Version 1.32.0 (2019-01-17)
3626 ==========================
3631 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3632 operator allows you to specify zero or one repetitions similar to the `*` and
3634 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3635 now always resolve to the item (`enum`, `struct`, etc.) available in the
3636 module if present, before resolving to a external crate or an item the prelude.][56759]
3639 enum Color { Red, Green, Blue }
3645 - [You can now match against `PhantomData<T>` types.][55837]
3646 - [You can now match against literals in macros with the `literal`
3647 specifier.][56072] This will match against a literal of any type.
3648 E.g. `1`, `'A'`, `"Hello World"`
3649 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3651 struct Point(i32, i32);
3654 pub fn new(x: i32, y: i32) -> Self {
3658 pub fn is_origin(&self) -> bool {
3666 - [Self can also now be used in type definitions.][56366] E.g.
3670 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3673 Cons(T, Box<Self>) // likewise here
3676 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3677 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3681 - [The default allocator has changed from jemalloc to the default allocator on
3682 your system.][55238] The compiler itself on Linux & macOS will still use
3683 jemalloc, but programs compiled with it will use the system allocator.
3684 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3688 - [`PathBuf` now implements `FromStr`.][55148]
3689 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3690 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3691 easily debug expressions in your rust program. E.g.
3694 let b = dbg!(a * 2) + 1;
3695 // ^-- prints: [src/main.rs:4] a * 2 = 4
3699 The following APIs are now `const` functions and can be used in a
3703 - [`UnsafeCell::get`]
3704 - [`char::is_ascii`]
3706 - [`ManuallyDrop::new`]
3707 - [`ManuallyDrop::into_inner`]
3708 - [`RangeInclusive::start`]
3709 - [`RangeInclusive::end`]
3710 - [`NonNull::as_ptr`]
3713 - [`Duration::as_secs`]
3714 - [`Duration::subsec_millis`]
3715 - [`Duration::subsec_micros`]
3716 - [`Duration::subsec_nanos`]
3718 - [`Ipv4Addr::is_unspecified`]
3720 - [`Ipv6Addr::octets`]
3724 - [`i8::to_be_bytes`]
3725 - [`i8::to_le_bytes`]
3726 - [`i8::to_ne_bytes`]
3727 - [`i8::from_be_bytes`]
3728 - [`i8::from_le_bytes`]
3729 - [`i8::from_ne_bytes`]
3730 - [`i16::to_be_bytes`]
3731 - [`i16::to_le_bytes`]
3732 - [`i16::to_ne_bytes`]
3733 - [`i16::from_be_bytes`]
3734 - [`i16::from_le_bytes`]
3735 - [`i16::from_ne_bytes`]
3736 - [`i32::to_be_bytes`]
3737 - [`i32::to_le_bytes`]
3738 - [`i32::to_ne_bytes`]
3739 - [`i32::from_be_bytes`]
3740 - [`i32::from_le_bytes`]
3741 - [`i32::from_ne_bytes`]
3742 - [`i64::to_be_bytes`]
3743 - [`i64::to_le_bytes`]
3744 - [`i64::to_ne_bytes`]
3745 - [`i64::from_be_bytes`]
3746 - [`i64::from_le_bytes`]
3747 - [`i64::from_ne_bytes`]
3748 - [`i128::to_be_bytes`]
3749 - [`i128::to_le_bytes`]
3750 - [`i128::to_ne_bytes`]
3751 - [`i128::from_be_bytes`]
3752 - [`i128::from_le_bytes`]
3753 - [`i128::from_ne_bytes`]
3754 - [`isize::to_be_bytes`]
3755 - [`isize::to_le_bytes`]
3756 - [`isize::to_ne_bytes`]
3757 - [`isize::from_be_bytes`]
3758 - [`isize::from_le_bytes`]
3759 - [`isize::from_ne_bytes`]
3760 - [`u8::to_be_bytes`]
3761 - [`u8::to_le_bytes`]
3762 - [`u8::to_ne_bytes`]
3763 - [`u8::from_be_bytes`]
3764 - [`u8::from_le_bytes`]
3765 - [`u8::from_ne_bytes`]
3766 - [`u16::to_be_bytes`]
3767 - [`u16::to_le_bytes`]
3768 - [`u16::to_ne_bytes`]
3769 - [`u16::from_be_bytes`]
3770 - [`u16::from_le_bytes`]
3771 - [`u16::from_ne_bytes`]
3772 - [`u32::to_be_bytes`]
3773 - [`u32::to_le_bytes`]
3774 - [`u32::to_ne_bytes`]
3775 - [`u32::from_be_bytes`]
3776 - [`u32::from_le_bytes`]
3777 - [`u32::from_ne_bytes`]
3778 - [`u64::to_be_bytes`]
3779 - [`u64::to_le_bytes`]
3780 - [`u64::to_ne_bytes`]
3781 - [`u64::from_be_bytes`]
3782 - [`u64::from_le_bytes`]
3783 - [`u64::from_ne_bytes`]
3784 - [`u128::to_be_bytes`]
3785 - [`u128::to_le_bytes`]
3786 - [`u128::to_ne_bytes`]
3787 - [`u128::from_be_bytes`]
3788 - [`u128::from_le_bytes`]
3789 - [`u128::from_ne_bytes`]
3790 - [`usize::to_be_bytes`]
3791 - [`usize::to_le_bytes`]
3792 - [`usize::to_ne_bytes`]
3793 - [`usize::from_be_bytes`]
3794 - [`usize::from_le_bytes`]
3795 - [`usize::from_ne_bytes`]
3799 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
3800 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
3804 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
3808 - [The argument types for AVX's
3809 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
3810 been changed from `*const` to `*mut` as the previous implementation
3814 [55148]: https://github.com/rust-lang/rust/pull/55148/
3815 [55238]: https://github.com/rust-lang/rust/pull/55238/
3816 [55280]: https://github.com/rust-lang/rust/pull/55280/
3817 [55610]: https://github.com/rust-lang/rust/pull/55610/
3818 [55663]: https://github.com/rust-lang/rust/pull/55663/
3819 [55702]: https://github.com/rust-lang/rust/pull/55702/
3820 [55837]: https://github.com/rust-lang/rust/pull/55837/
3821 [55843]: https://github.com/rust-lang/rust/pull/55843/
3822 [56072]: https://github.com/rust-lang/rust/pull/56072/
3823 [56245]: https://github.com/rust-lang/rust/pull/56245/
3824 [56365]: https://github.com/rust-lang/rust/pull/56365/
3825 [56366]: https://github.com/rust-lang/rust/pull/56366/
3826 [56395]: https://github.com/rust-lang/rust/pull/56395/
3827 [56759]: https://github.com/rust-lang/rust/pull/56759/
3828 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
3829 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
3830 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
3831 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
3832 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
3833 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
3834 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
3835 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
3836 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
3837 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
3838 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
3839 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
3840 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
3841 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
3842 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
3843 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
3844 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
3845 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
3846 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
3847 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
3848 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
3849 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
3850 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
3851 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
3852 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
3853 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
3854 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
3855 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
3856 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
3857 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
3858 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
3859 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
3860 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
3861 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
3862 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
3863 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
3864 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
3865 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
3866 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
3867 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
3868 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
3869 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
3870 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
3871 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
3872 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
3873 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
3874 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
3875 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
3876 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
3877 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
3878 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
3879 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
3880 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
3881 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
3882 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
3883 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
3884 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
3885 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
3886 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
3887 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
3888 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
3889 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
3890 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
3891 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
3892 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
3893 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
3894 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
3895 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
3896 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
3897 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
3898 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
3899 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
3900 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
3901 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
3902 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
3903 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
3904 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
3905 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
3906 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
3907 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
3908 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
3909 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
3910 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
3911 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
3912 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
3913 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
3914 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
3915 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
3916 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
3917 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
3918 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
3919 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
3920 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
3923 Version 1.31.1 (2018-12-20)
3924 ===========================
3926 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
3927 - [Fix broken go-to-definition in RLS][rls/1171]
3928 - [Fix infinite loop on hover in RLS][rls/1170]
3930 [56562]: https://github.com/rust-lang/rust/pull/56562
3931 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
3932 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
3934 Version 1.31.0 (2018-12-06)
3935 ==========================
3939 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
3940 - [New lifetime elision rules now allow for eliding lifetimes in functions and
3941 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
3942 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
3944 - [You can now define and use `const` functions.][54835] These are currently
3945 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
3946 [language reference][const-reference] for what exactly is available.
3947 - [You can now use tool lints, which allow you to scope lints from external
3948 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
3949 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
3950 a crate, not just in exported functions.][54451]
3951 - [You can now use parentheses in pattern matches.][54497]
3955 - [Updated musl to 1.1.20][54430]
3959 - [You can now convert `num::NonZero*` types to their raw equivalents using the
3960 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
3961 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
3962 into `Option<&mut T>` using the `From` trait.][53218]
3963 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
3968 - [`slice::align_to`]
3969 - [`slice::align_to_mut`]
3970 - [`slice::chunks_exact`]
3971 - [`slice::chunks_exact_mut`]
3972 - [`slice::rchunks`]
3973 - [`slice::rchunks_mut`]
3974 - [`slice::rchunks_exact`]
3975 - [`slice::rchunks_exact_mut`]
3976 - [`Option::replace`]
3980 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
3981 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
3982 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
3984 [52813]: https://github.com/rust-lang/rust/pull/52813/
3985 [53218]: https://github.com/rust-lang/rust/pull/53218/
3986 [54057]: https://github.com/rust-lang/rust/pull/54057/
3987 [54240]: https://github.com/rust-lang/rust/pull/54240/
3988 [54430]: https://github.com/rust-lang/rust/pull/54430/
3989 [54451]: https://github.com/rust-lang/rust/pull/54451/
3990 [54497]: https://github.com/rust-lang/rust/pull/54497/
3991 [54778]: https://github.com/rust-lang/rust/pull/54778/
3992 [54835]: https://github.com/rust-lang/rust/pull/54835/
3993 [54870]: https://github.com/rust-lang/rust/pull/54870/
3994 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
3995 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
3996 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
3997 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
3998 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
3999 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4000 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4001 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4002 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4003 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4004 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4005 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4006 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4007 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4009 Version 1.30.1 (2018-11-08)
4010 ===========================
4012 - [Fixed overflow ICE in rustdoc][54199]
4013 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4015 [54199]: https://github.com/rust-lang/rust/pull/54199
4016 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4018 Version 1.30.0 (2018-10-25)
4019 ==========================
4023 - [Procedural macros are now available.][52081] These kinds of macros allow for
4024 more powerful code generation. There is a [new chapter available][proc-macros]
4025 in the Rust Programming Language book that goes further in depth.
4026 - [You can now use keywords as identifiers using the raw identifiers
4027 syntax (`r#`),][53236] e.g. `let r#for = true;`
4028 - [Using anonymous parameters in traits is now deprecated with a warning and
4029 will be a hard error in the 2018 edition.][53272]
4030 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4031 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4032 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4033 Previously, using a external crate in a module without a use statement
4034 required `let json = ::serde_json::from_str(foo);` but can now be written
4035 as `let json = serde_json::from_str(foo);`.
4036 - [You can now apply the `#[used]` attribute to static items to prevent the
4037 compiler from optimising them away, even if they appear to be unused,][51363]
4038 e.g. `#[used] static FOO: u32 = 1;`
4039 - [You can now import and reexport macros from other crates with the `use`
4040 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4041 the root module of the crate. If your macro relies on calling other local
4042 macros, it is recommended to export with the
4043 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4045 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4046 using the `vis` specifier.][53370]
4047 - [Non-macro attributes now allow all forms of literals, not just
4048 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4049 write `#[attr(true)]`.
4050 - [You can now specify a function to handle a panic in the Rust runtime with the
4051 `#[panic_handler]` attribute.][51366]
4055 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4056 - [Added the `aarch64-unknown-netbsd` target][53165]
4057 - [Upgraded to LLVM 8.][53611]
4061 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4065 - [`Ipv4Addr::BROADCAST`]
4066 - [`Ipv4Addr::LOCALHOST`]
4067 - [`Ipv4Addr::UNSPECIFIED`]
4068 - [`Ipv6Addr::LOCALHOST`]
4069 - [`Ipv6Addr::UNSPECIFIED`]
4070 - [`Iterator::find_map`]
4072 The following methods are replacement methods for `trim_left`, `trim_right`,
4073 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4075 - [`str::trim_end_matches`]
4077 - [`str::trim_start_matches`]
4078 - [`str::trim_start`]
4082 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4083 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4084 equivalent to calling `rustdoc --error-format=json`.
4085 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4089 - [`rustdoc` allows you to specify what edition to treat your code as with the
4090 `--edition` option.][54057]
4091 - [`rustdoc` now has the `--color` (specify whether to output color) and
4092 `--error-format` (specify error format, e.g. `json`) options.][53003]
4093 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4094 debug symbols.][53774]
4095 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4096 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4098 [50911]: https://github.com/rust-lang/rust/pull/50911/
4099 [51363]: https://github.com/rust-lang/rust/pull/51363/
4100 [51366]: https://github.com/rust-lang/rust/pull/51366/
4101 [52081]: https://github.com/rust-lang/rust/pull/52081/
4102 [53003]: https://github.com/rust-lang/rust/pull/53003/
4103 [53033]: https://github.com/rust-lang/rust/pull/53033/
4104 [53044]: https://github.com/rust-lang/rust/pull/53044/
4105 [53165]: https://github.com/rust-lang/rust/pull/53165/
4106 [53611]: https://github.com/rust-lang/rust/pull/53611/
4107 [53236]: https://github.com/rust-lang/rust/pull/53236/
4108 [53272]: https://github.com/rust-lang/rust/pull/53272/
4109 [53370]: https://github.com/rust-lang/rust/pull/53370/
4110 [53459]: https://github.com/rust-lang/rust/pull/53459/
4111 [53774]: https://github.com/rust-lang/rust/pull/53774/
4112 [53822]: https://github.com/rust-lang/rust/pull/53822/
4113 [54057]: https://github.com/rust-lang/rust/pull/54057/
4114 [54404]: https://github.com/rust-lang/rust/pull/54404/
4115 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4116 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4117 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4118 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4120 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4121 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4122 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4123 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4124 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4125 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4126 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4127 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4128 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4129 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4132 Version 1.29.2 (2018-10-11)
4133 ===========================
4135 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4136 - The `rls-preview` component on the windows-gnu targets has been restored.
4138 [54639]: https://github.com/rust-lang/rust/pull/54639
4141 Version 1.29.1 (2018-09-25)
4142 ===========================
4147 - The standard library's `str::repeat` function contained an out of bounds write
4148 caused by an integer overflow. This has been fixed by deterministically
4149 panicking when an overflow happens.
4151 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4155 Version 1.29.0 (2018-09-13)
4156 ==========================
4160 - [Bumped minimum LLVM version to 5.0.][51899]
4161 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4162 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4163 - [Upgraded to LLVM 7.][51966]
4167 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4168 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4169 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4170 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4172 - [`Cell<T>` now allows `T` to be unsized.][50494]
4173 - [`SocketAddr` is now stable on Redox.][52656]
4178 - [`Iterator::flatten`]
4183 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4184 `--locked` to disable this behavior.
4185 - [`cargo-install` will now allow you to cross compile an install
4186 using `--target`.][cargo/5614]
4187 - [Added the `cargo-fix` subcommand to automatically move project code from
4188 2015 edition to 2018.][cargo/5723]
4189 - [`cargo doc` can now optionally document private types using the
4190 `--document-private-items` flag.][cargo/5543]
4194 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4195 the specified level to that level.][52354] For example `--cap-lints warn`
4196 will demote `deny` and `forbid` lints to `warn`.
4197 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4198 fails and `101` if there is a panic.][52197]
4199 - [A preview of clippy has been made available through rustup.][51122]
4200 You can install the preview with `rustup component add clippy-preview`.
4204 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4205 Use `str::get_unchecked(begin..end)` instead.
4206 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4207 Consider using the `home_dir` function from
4208 https://crates.io/crates/dirs instead.
4209 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4210 - [`cfg` attributes and `--cfg` command line flags are now more
4211 strictly validated.][53893]
4213 [53893]: https://github.com/rust-lang/rust/pull/53893/
4214 [52861]: https://github.com/rust-lang/rust/pull/52861/
4215 [51966]: https://github.com/rust-lang/rust/pull/51966/
4216 [52656]: https://github.com/rust-lang/rust/pull/52656/
4217 [52239]: https://github.com/rust-lang/rust/pull/52239/
4218 [52330]: https://github.com/rust-lang/rust/pull/52330/
4219 [52354]: https://github.com/rust-lang/rust/pull/52354/
4220 [52402]: https://github.com/rust-lang/rust/pull/52402/
4221 [52197]: https://github.com/rust-lang/rust/pull/52197/
4222 [51807]: https://github.com/rust-lang/rust/pull/51807/
4223 [51899]: https://github.com/rust-lang/rust/pull/51899/
4224 [51912]: https://github.com/rust-lang/rust/pull/51912/
4225 [51619]: https://github.com/rust-lang/rust/pull/51619/
4226 [51656]: https://github.com/rust-lang/rust/pull/51656/
4227 [51178]: https://github.com/rust-lang/rust/pull/51178/
4228 [51122]: https://github.com/rust-lang/rust/pull/51122
4229 [50494]: https://github.com/rust-lang/rust/pull/50494/
4230 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4231 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4232 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4233 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4234 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4235 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4236 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4239 Version 1.28.0 (2018-08-02)
4240 ===========================
4244 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4245 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4246 the inner type across Foreign Function Interface (FFI) boundaries.
4247 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4248 and can now be used as identifiers.][51196]
4249 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4250 stable.][51241] This will allow users to specify a global allocator for
4252 - [Unit test functions marked with the `#[test]` attribute can now return
4253 `Result<(), E: Debug>` in addition to `()`.][51298]
4254 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4255 allows macros to easily target lifetimes.
4259 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4260 prioritise making smaller binary sizes. `z` is the same as `s` with the
4261 exception that it does not vectorise loops, which typically results in an even
4263 - [The short error format is now stable.][49546] Specified with
4264 `--error-format=short` this option will provide a more compressed output of
4265 rust error messages.
4266 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4267 - [Reduced the number of allocations in the macro parser.][50855] This can
4268 improve compile times of macro heavy crates on average by 5%.
4272 - [Implemented `Default` for `&mut str`.][51306]
4273 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4274 - [Implemented `Extend` for `()`.][50234]
4275 - [The `Debug` implementation of `time::Duration` should now be more easily
4276 human readable.][50364] Previously a `Duration` of one second would printed as
4277 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4278 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4279 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4280 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4281 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4282 for `PathBuf`.][50170]
4283 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4284 and `Wrapping<i128>`.][50465]
4285 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4286 possible.][51050] This can provide up to a 40% speed increase.
4287 - [Improved error messages when using `format!`.][50610]
4291 - [`Iterator::step_by`]
4292 - [`Path::ancestors`]
4293 - [`SystemTime::UNIX_EPOCH`]
4294 - [`alloc::GlobalAlloc`]
4296 - [`alloc::LayoutErr`]
4299 - [`alloc::alloc_zeroed`]
4300 - [`alloc::dealloc`]
4301 - [`alloc::realloc`]
4302 - [`alloc::handle_alloc_error`]
4303 - [`btree_map::Entry::or_default`]
4304 - [`fmt::Alignment`]
4305 - [`hash_map::Entry::or_default`]
4306 - [`iter::repeat_with`]
4307 - [`num::NonZeroUsize`]
4308 - [`num::NonZeroU128`]
4309 - [`num::NonZeroU16`]
4310 - [`num::NonZeroU32`]
4311 - [`num::NonZeroU64`]
4312 - [`num::NonZeroU8`]
4313 - [`ops::RangeBounds`]
4314 - [`slice::SliceIndex`]
4315 - [`slice::from_mut`]
4316 - [`slice::from_ref`]
4317 - [`{Any + Send + Sync}::downcast_mut`]
4318 - [`{Any + Send + Sync}::downcast_ref`]
4319 - [`{Any + Send + Sync}::is`]
4323 - [Cargo will now no longer allow you to publish crates with build scripts that
4324 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4325 considered to be immutable.
4329 - [The `suggestion_applicability` field in `rustc`'s json output is now
4330 stable.][50486] This will allow dev tools to check whether a code suggestion
4331 would apply to them.
4335 - [Rust will consider trait objects with duplicated constraints to be the same
4336 type as without the duplicated constraint.][51276] For example the below code will
4337 now fail to compile.
4342 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4345 impl Trait + Send + Send {
4346 fn test(&self) { println!("two"); }
4350 [49546]: https://github.com/rust-lang/rust/pull/49546/
4351 [50143]: https://github.com/rust-lang/rust/pull/50143/
4352 [50170]: https://github.com/rust-lang/rust/pull/50170/
4353 [50234]: https://github.com/rust-lang/rust/pull/50234/
4354 [50265]: https://github.com/rust-lang/rust/pull/50265/
4355 [50364]: https://github.com/rust-lang/rust/pull/50364/
4356 [50385]: https://github.com/rust-lang/rust/pull/50385/
4357 [50465]: https://github.com/rust-lang/rust/pull/50465/
4358 [50486]: https://github.com/rust-lang/rust/pull/50486/
4359 [50554]: https://github.com/rust-lang/rust/pull/50554/
4360 [50610]: https://github.com/rust-lang/rust/pull/50610/
4361 [50855]: https://github.com/rust-lang/rust/pull/50855/
4362 [51050]: https://github.com/rust-lang/rust/pull/51050/
4363 [51196]: https://github.com/rust-lang/rust/pull/51196/
4364 [51241]: https://github.com/rust-lang/rust/pull/51241/
4365 [51276]: https://github.com/rust-lang/rust/pull/51276/
4366 [51298]: https://github.com/rust-lang/rust/pull/51298/
4367 [51306]: https://github.com/rust-lang/rust/pull/51306/
4368 [51562]: https://github.com/rust-lang/rust/pull/51562/
4369 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4370 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4371 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4372 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4373 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4374 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4375 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4376 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4377 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4378 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4379 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4380 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4381 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4382 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4383 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4384 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4385 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4386 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4387 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4388 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4389 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4390 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4391 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4392 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4393 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4394 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4395 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4396 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4397 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4398 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4400 Version 1.27.2 (2018-07-20)
4401 ===========================
4406 - The borrow checker was fixed to avoid potential unsoundness when using
4407 match ergonomics: [#52213][52213].
4409 [52213]: https://github.com/rust-lang/rust/issues/52213
4411 Version 1.27.1 (2018-07-10)
4412 ===========================
4417 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4418 when running, which enabled executing code as some other user on a
4419 given machine. This release fixes that vulnerability; you can read
4420 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4422 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4427 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4428 match ergonomics: [#51415][51415], [#49534][49534].
4430 [51415]: https://github.com/rust-lang/rust/issues/51415
4431 [49534]: https://github.com/rust-lang/rust/issues/49534
4432 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4433 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4435 Version 1.27.0 (2018-06-21)
4436 ==========================
4440 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4441 be used as an identifier.
4442 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4443 bare `Trait` syntax, and should make it clearer when being used in tandem with
4444 `impl Trait` because it is equivalent to the following syntax:
4445 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4446 `Box<Trait> == Box<dyn Trait>`.
4447 - [Attributes on generic parameters such as types and lifetimes are
4448 now stable.][48851] e.g.
4449 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4450 - [The `#[must_use]` attribute can now also be used on functions as well as
4451 types.][48925] It provides a lint that by default warns users when the
4452 value returned by a function has not been used.
4456 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4460 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4461 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4462 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4463 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4464 the `cfg` attribute.
4465 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4466 std are now available in core.][49896]
4467 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4469 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4470 that the operation isn't done in place.
4471 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4472 the `#[must_use]` attribute][49533] to warn about unused potentially
4473 expensive allocations.
4477 - [`DoubleEndedIterator::rfind`]
4478 - [`DoubleEndedIterator::rfold`]
4479 - [`DoubleEndedIterator::try_rfold`]
4480 - [`Duration::from_micros`]
4481 - [`Duration::from_nanos`]
4482 - [`Duration::subsec_micros`]
4483 - [`Duration::subsec_millis`]
4484 - [`HashMap::remove_entry`]
4485 - [`Iterator::try_fold`]
4486 - [`Iterator::try_for_each`]
4488 - [`Option::filter`]
4489 - [`String::replace_range`]
4490 - [`Take::set_limit`]
4491 - [`hint::unreachable_unchecked`]
4492 - [`os::unix::process::parent_id`]
4493 - [`ptr::swap_nonoverlapping`]
4494 - [`slice::rsplit_mut`]
4496 - [`slice::swap_with_slice`]
4500 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4501 `readme`, and `repository` fields.][cargo/5386]
4502 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4503 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4504 a different directory than `target` for placing compilation artifacts.
4505 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4506 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4507 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4508 where cargo would infer a binary, Cargo will produce a warning. You can
4509 disable this feature ahead of time by setting any of the following to false:
4510 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4511 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4512 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4516 - [Added “The Rustc book” into the official documentation.][49707]
4517 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4518 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4522 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4523 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4524 compile, `"".is_empty()` will still compile.
4525 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4526 will only print the inner type.][48553] E.g.
4527 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4528 not `AtomicBool(true)`.
4529 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4530 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4531 alignment should cover all use cases.
4532 - The `.description()` method on the `std::error::Error` trait
4533 [has been soft-deprecated][50163]. It is no longer required to implement it.
4535 [48553]: https://github.com/rust-lang/rust/pull/48553/
4536 [48851]: https://github.com/rust-lang/rust/pull/48851/
4537 [48925]: https://github.com/rust-lang/rust/pull/48925/
4538 [49533]: https://github.com/rust-lang/rust/pull/49533/
4539 [49623]: https://github.com/rust-lang/rust/pull/49623/
4540 [49630]: https://github.com/rust-lang/rust/pull/49630/
4541 [49664]: https://github.com/rust-lang/rust/pull/49664/
4542 [49699]: https://github.com/rust-lang/rust/pull/49699/
4543 [49707]: https://github.com/rust-lang/rust/pull/49707/
4544 [49896]: https://github.com/rust-lang/rust/pull/49896/
4545 [49968]: https://github.com/rust-lang/rust/pull/49968/
4546 [50163]: https://github.com/rust-lang/rust/pull/50163
4547 [50177]: https://github.com/rust-lang/rust/pull/50177/
4548 [50378]: https://github.com/rust-lang/rust/pull/50378/
4549 [50423]: https://github.com/rust-lang/rust/pull/50423/
4550 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4551 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4552 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4553 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4554 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4555 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4556 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4557 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4558 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4559 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4560 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4561 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4562 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4563 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4564 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4565 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4566 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4567 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4568 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4569 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4570 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4571 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4572 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4573 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4574 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4575 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4576 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4577 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4578 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4581 Version 1.26.2 (2018-06-05)
4582 ==========================
4587 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4589 [51117]: https://github.com/rust-lang/rust/issues/51117
4592 Version 1.26.1 (2018-05-29)
4593 ==========================
4598 - [RLS now works on Windows.][50646]
4599 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4605 - [`fn main() -> impl Trait` no longer works for non-Termination
4607 This reverts an accidental stabilization.
4608 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4609 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4611 [50646]: https://github.com/rust-lang/rust/issues/50646
4612 [50656]: https://github.com/rust-lang/rust/pull/50656
4613 [50812]: https://github.com/rust-lang/rust/pull/50812
4614 [50950]: https://github.com/rust-lang/rust/issues/50950
4615 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4617 Version 1.26.0 (2018-05-10)
4618 ==========================
4622 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4623 implement either or both traits.][49299]
4624 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4625 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4626 lifetime can be elided.][49458]
4627 - [`impl Trait` is now stable allowing you to have abstract types in returns
4628 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4629 `fn open(path: impl AsRef<Path>)`.
4630 - [Pattern matching will now automatically apply dereferences.][49394]
4631 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4632 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4633 - [A lot of operations are now available in a const context.][46882] E.g. You
4634 can now index into constant arrays, reference and dereference into constants,
4635 and use tuple struct constructors.
4636 - [Fixed entry slice patterns are now stable.][48516] E.g.
4638 let points = [1, 2, 3, 4];
4640 [1, 2, 3, 4] => println!("All points were sequential."),
4641 _ => println!("Not all points were sequential."),
4648 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4649 - [Fixed exponential projection complexity on nested types.][48296]
4650 This can provide up to a ~12% reduction in compile times for certain crates.
4651 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4652 to remap path prefixes outputted by the compiler.
4653 - [Added `powerpc-unknown-netbsd` target.][48281]
4657 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4658 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4659 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4660 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4661 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4662 - [`ascii::escape_default` is now available in libcore.][48735]
4663 - [Trailing commas are now supported in std and core macros.][48056]
4664 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4665 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4670 - [`*const T::copy_to_nonoverlapping`]
4671 - [`*const T::copy_to`]
4672 - [`*const T::read_unaligned`]
4673 - [`*const T::read_volatile`]
4674 - [`*const T::read`]
4676 - [`*const T::wrapping_add`]
4677 - [`*const T::wrapping_sub`]
4679 - [`*mut T::copy_to_nonoverlapping`]
4680 - [`*mut T::copy_to`]
4681 - [`*mut T::read_unaligned`]
4682 - [`*mut T::read_volatile`]
4684 - [`*mut T::replace`]
4687 - [`*mut T::wrapping_add`]
4688 - [`*mut T::wrapping_sub`]
4689 - [`*mut T::write_bytes`]
4690 - [`*mut T::write_unaligned`]
4691 - [`*mut T::write_volatile`]
4694 - [`FromUtf8Error::as_bytes`]
4695 - [`LocalKey::try_with`]
4696 - [`Option::cloned`]
4697 - [`btree_map::Entry::and_modify`]
4698 - [`fs::read_to_string`]
4701 - [`hash_map::Entry::and_modify`]
4702 - [`iter::FusedIterator`]
4703 - [`ops::RangeInclusive`]
4704 - [`ops::RangeToInclusive`]
4706 - [`slice::rotate_left`]
4707 - [`slice::rotate_right`]
4708 - [`String::retain`]
4713 - [Cargo will now output path to custom commands when `-v` is
4714 passed with `--list`][cargo/5041]
4715 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4719 - [The second edition of "The Rust Programming Language" book is now recommended
4720 over the first.][48404]
4725 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4726 syntax is now invalid.
4728 use std::ops::Fn as dyn;
4729 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4731 - [The result of dereferences are no longer promoted to `'static`.][47408]
4735 const PAIR: &(i32, i32) = &(0, 1);
4736 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4739 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4740 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4742 - [Removed hoedown from rustdoc.][48274]
4743 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4745 [46882]: https://github.com/rust-lang/rust/pull/46882
4746 [47379]: https://github.com/rust-lang/rust/pull/47379
4747 [47408]: https://github.com/rust-lang/rust/pull/47408
4748 [47813]: https://github.com/rust-lang/rust/pull/47813
4749 [48056]: https://github.com/rust-lang/rust/pull/48056
4750 [48125]: https://github.com/rust-lang/rust/pull/48125
4751 [48235]: https://github.com/rust-lang/rust/pull/48235
4752 [48274]: https://github.com/rust-lang/rust/pull/48274
4753 [48281]: https://github.com/rust-lang/rust/pull/48281
4754 [48296]: https://github.com/rust-lang/rust/pull/48296
4755 [48326]: https://github.com/rust-lang/rust/pull/48326
4756 [48359]: https://github.com/rust-lang/rust/pull/48359
4757 [48404]: https://github.com/rust-lang/rust/pull/48404
4758 [48481]: https://github.com/rust-lang/rust/pull/48481
4759 [48516]: https://github.com/rust-lang/rust/pull/48516
4760 [48628]: https://github.com/rust-lang/rust/pull/48628
4761 [48629]: https://github.com/rust-lang/rust/pull/48629
4762 [48657]: https://github.com/rust-lang/rust/pull/48657
4763 [48735]: https://github.com/rust-lang/rust/pull/48735
4764 [48978]: https://github.com/rust-lang/rust/pull/48978
4765 [49101]: https://github.com/rust-lang/rust/pull/49101
4766 [49109]: https://github.com/rust-lang/rust/pull/49109
4767 [49162]: https://github.com/rust-lang/rust/pull/49162
4768 [49255]: https://github.com/rust-lang/rust/pull/49255
4769 [49299]: https://github.com/rust-lang/rust/pull/49299
4770 [49305]: https://github.com/rust-lang/rust/pull/49305
4771 [49394]: https://github.com/rust-lang/rust/pull/49394
4772 [49458]: https://github.com/rust-lang/rust/pull/49458
4773 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4774 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4775 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4776 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4777 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4778 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4779 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4780 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4781 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4782 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4783 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4784 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4785 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4786 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4787 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4788 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4789 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4790 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4791 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4792 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4793 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4794 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4795 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
4796 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
4797 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
4798 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
4799 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
4800 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
4801 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
4802 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
4803 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
4804 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
4805 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
4806 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
4807 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
4808 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
4809 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4810 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
4811 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
4812 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
4813 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
4814 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
4817 Version 1.25.0 (2018-03-29)
4818 ==========================
4822 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
4823 - [You can now use nested groups of imports.][47948]
4824 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
4825 - [You can now have `|` at the start of a match arm.][47947] e.g.
4827 enum Foo { A, B, C }
4833 | Foo::B => println!("AB"),
4834 | Foo::C => println!("C"),
4841 - [Upgraded to LLVM 6.][47828]
4842 - [Added `-C lto=val` option.][47521]
4843 - [Added `i586-unknown-linux-musl` target][47282]
4847 - [Impl Send for `process::Command` on Unix.][47760]
4848 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
4849 - [`UnsafeCell::into_inner` is now safe.][47204]
4850 - [Implement libstd for CloudABI.][47268]
4851 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
4852 - [Implement `AsRef<Path>` for Component][46985]
4853 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
4854 - [Moved `Duration` to libcore.][46666]
4858 - [`Location::column`]
4861 The following functions can now be used in a constant expression.
4862 eg. `static MINUTE: Duration = Duration::from_secs(60);`
4863 - [`Duration::new`][47300]
4864 - [`Duration::from_secs`][47300]
4865 - [`Duration::from_millis`][47300]
4869 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
4870 - [`cargo new` now defaults to creating a binary crate, instead of a
4871 library crate.][cargo/5029]
4875 - [Rust by example is now shipped with new releases][46196]
4879 - [Deprecated `net::lookup_host`.][47510]
4880 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
4881 - The borrow checker was sometimes incorrectly permitting overlapping borrows
4882 around indexing operations (see [#47349][47349]). This has been fixed (which also
4883 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
4884 - [Removed deprecated unstable attribute `#[simd]`.][47251]
4886 [33903]: https://github.com/rust-lang/rust/pull/33903
4887 [47947]: https://github.com/rust-lang/rust/pull/47947
4888 [47948]: https://github.com/rust-lang/rust/pull/47948
4889 [47760]: https://github.com/rust-lang/rust/pull/47760
4890 [47790]: https://github.com/rust-lang/rust/pull/47790
4891 [47828]: https://github.com/rust-lang/rust/pull/47828
4892 [47398]: https://github.com/rust-lang/rust/pull/47398
4893 [47510]: https://github.com/rust-lang/rust/pull/47510
4894 [47521]: https://github.com/rust-lang/rust/pull/47521
4895 [47204]: https://github.com/rust-lang/rust/pull/47204
4896 [47251]: https://github.com/rust-lang/rust/pull/47251
4897 [47268]: https://github.com/rust-lang/rust/pull/47268
4898 [47282]: https://github.com/rust-lang/rust/pull/47282
4899 [47300]: https://github.com/rust-lang/rust/pull/47300
4900 [47349]: https://github.com/rust-lang/rust/pull/47349
4901 [46931]: https://github.com/rust-lang/rust/pull/46931
4902 [46985]: https://github.com/rust-lang/rust/pull/46985
4903 [47006]: https://github.com/rust-lang/rust/pull/47006
4904 [46830]: https://github.com/rust-lang/rust/pull/46830
4905 [46095]: https://github.com/rust-lang/rust/pull/46095
4906 [46666]: https://github.com/rust-lang/rust/pull/46666
4907 [46196]: https://github.com/rust-lang/rust/pull/46196
4908 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
4909 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
4910 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
4911 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
4912 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
4915 Version 1.24.1 (2018-03-01)
4916 ==========================
4918 - [Do not abort when unwinding through FFI][48251]
4919 - [Emit UTF-16 files for linker arguments on Windows][48318]
4920 - [Make the error index generator work again][48308]
4921 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
4923 [48251]: https://github.com/rust-lang/rust/issues/48251
4924 [48308]: https://github.com/rust-lang/rust/issues/48308
4925 [48318]: https://github.com/rust-lang/rust/issues/48318
4926 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
4929 Version 1.24.0 (2018-02-15)
4930 ==========================
4934 - [External `sysv64` ffi is now available.][46528]
4935 eg. `extern "sysv64" fn foo () {}`
4939 - [rustc now uses 16 codegen units by default for release builds.][46910]
4940 For the fastest builds, utilize `codegen-units=1`.
4941 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
4942 - [Add `aarch64-unknown-openbsd` support][46760]
4946 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
4947 improvement in performance in the majority of cases.
4948 - [`OsStr`'s `Debug` implementation is now lossless and consistent
4949 with Windows.][46798]
4950 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
4951 - [impl `From<bool>` for `AtomicBool`][46293]
4952 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
4953 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
4954 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
4955 - [float::from_bits now just uses transmute.][46012] This provides
4956 some optimisations from LLVM.
4957 - [Copied `AsciiExt` methods onto `char`][46077]
4958 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
4959 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
4960 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
4961 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
4965 - [`RefCell::replace`]
4967 - [`atomic::spin_loop_hint`]
4969 The following functions can now be used in a constant expression.
4970 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
4972 - [`AtomicBool::new`][46287]
4973 - [`AtomicUsize::new`][46287]
4974 - [`AtomicIsize::new`][46287]
4975 - [`AtomicPtr::new`][46287]
4976 - [`Cell::new`][46287]
4977 - [`{integer}::min_value`][46287]
4978 - [`{integer}::max_value`][46287]
4979 - [`mem::size_of`][46287]
4980 - [`mem::align_of`][46287]
4981 - [`ptr::null`][46287]
4982 - [`ptr::null_mut`][46287]
4983 - [`RefCell::new`][46287]
4984 - [`UnsafeCell::new`][46287]
4988 - [Added a `workspace.default-members` config that
4989 overrides implied `--all` in virtual workspaces.][cargo/4743]
4990 - [Enable incremental by default on development builds.][cargo/4817] Also added
4991 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
4992 per-project or global basis respectively.
4999 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5000 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5001 in accordance with IETF RFC 4291 §2.2.
5002 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5003 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5004 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5005 - [Leading zeros in tuple struct members is now an error][47084]
5006 - [`column!()` macro is one-based instead of zero-based][46977]
5007 - [`fmt::Arguments` can no longer be shared across threads][45198]
5008 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5009 - [Cargo sets a different working directory for the compiler][cargo/4788]
5011 [44884]: https://github.com/rust-lang/rust/pull/44884
5012 [45198]: https://github.com/rust-lang/rust/pull/45198
5013 [45506]: https://github.com/rust-lang/rust/pull/45506
5014 [45990]: https://github.com/rust-lang/rust/pull/45990
5015 [46012]: https://github.com/rust-lang/rust/pull/46012
5016 [46077]: https://github.com/rust-lang/rust/pull/46077
5017 [46094]: https://github.com/rust-lang/rust/pull/46094
5018 [46284]: https://github.com/rust-lang/rust/pull/46284
5019 [46287]: https://github.com/rust-lang/rust/pull/46287
5020 [46293]: https://github.com/rust-lang/rust/pull/46293
5021 [46528]: https://github.com/rust-lang/rust/pull/46528
5022 [46671]: https://github.com/rust-lang/rust/pull/46671
5023 [46713]: https://github.com/rust-lang/rust/pull/46713
5024 [46735]: https://github.com/rust-lang/rust/pull/46735
5025 [46760]: https://github.com/rust-lang/rust/pull/46760
5026 [46798]: https://github.com/rust-lang/rust/pull/46798
5027 [46828]: https://github.com/rust-lang/rust/pull/46828
5028 [46831]: https://github.com/rust-lang/rust/pull/46831
5029 [46833]: https://github.com/rust-lang/rust/pull/46833
5030 [46910]: https://github.com/rust-lang/rust/pull/46910
5031 [46977]: https://github.com/rust-lang/rust/pull/46977
5032 [47018]: https://github.com/rust-lang/rust/pull/47018
5033 [47080]: https://github.com/rust-lang/rust/pull/47080
5034 [47084]: https://github.com/rust-lang/rust/pull/47084
5035 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5036 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5037 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5038 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5039 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5040 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5043 Version 1.23.0 (2018-01-04)
5044 ==========================
5048 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5049 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5050 Which should fix some confusing errors in some operations.
5054 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5055 undefined behavior.][45920]
5056 - [rustc now suggests renaming import if names clash.][45660]
5057 - [Display errors/warnings correctly when there are zero-width or
5058 wide characters.][45711]
5059 - [rustc now avoids unnecessary copies of arguments that are
5060 simple bindings][45380] This should improve memory usage on average by 5-10%.
5061 - [Updated musl used to build musl rustc to 1.1.17][45393]
5065 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5066 - [Implement Hash for raw pointers to unsized types][45483]
5067 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5068 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5069 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5070 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5071 and `<*mut T>::as_mut`][44932]
5072 - [Optimized `Thread::{park, unpark}` implementation][45524]
5073 - [Improved `SliceExt::binary_search` performance.][45333]
5074 - [impl `FromIterator<()>` for `()`][45379]
5075 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5083 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5084 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5085 - [Added unit test checking to `cargo check`][cargo/4592]
5086 - [Cargo now lets you install a specific version
5087 using `cargo install --version`][cargo/4637]
5091 - [Releases now ship with the Cargo book documentation.][45692]
5092 - [rustdoc now prints rendering warnings on every run.][45324]
5096 - [Changes have been made to type equality to make it more correct,
5097 in rare cases this could break some code.][45853] [Tracking issue for
5098 further information][45852]
5099 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5100 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5101 Android 9, the minimum supported version is Android 14.
5102 - [Bumped the minimum LLVM to 3.9][45326]
5104 [44042]: https://github.com/rust-lang/rust/pull/44042
5105 [44932]: https://github.com/rust-lang/rust/pull/44932
5106 [45267]: https://github.com/rust-lang/rust/pull/45267
5107 [45324]: https://github.com/rust-lang/rust/pull/45324
5108 [45326]: https://github.com/rust-lang/rust/pull/45326
5109 [45333]: https://github.com/rust-lang/rust/pull/45333
5110 [45379]: https://github.com/rust-lang/rust/pull/45379
5111 [45380]: https://github.com/rust-lang/rust/pull/45380
5112 [45393]: https://github.com/rust-lang/rust/pull/45393
5113 [45435]: https://github.com/rust-lang/rust/pull/45435
5114 [45483]: https://github.com/rust-lang/rust/pull/45483
5115 [45524]: https://github.com/rust-lang/rust/pull/45524
5116 [45571]: https://github.com/rust-lang/rust/pull/45571
5117 [45580]: https://github.com/rust-lang/rust/pull/45580
5118 [45610]: https://github.com/rust-lang/rust/pull/45610
5119 [45660]: https://github.com/rust-lang/rust/pull/45660
5120 [45692]: https://github.com/rust-lang/rust/pull/45692
5121 [45711]: https://github.com/rust-lang/rust/pull/45711
5122 [45772]: https://github.com/rust-lang/rust/pull/45772
5123 [45852]: https://github.com/rust-lang/rust/issues/45852
5124 [45853]: https://github.com/rust-lang/rust/pull/45853
5125 [45887]: https://github.com/rust-lang/rust/pull/45887
5126 [45920]: https://github.com/rust-lang/rust/pull/45920
5127 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5128 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5129 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5132 Version 1.22.1 (2017-11-22)
5133 ==========================
5135 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5137 [46183]: https://github.com/rust-lang/rust/pull/46183
5139 Version 1.22.0 (2017-11-22)
5140 ==========================
5144 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5145 - [Now accepts underscores in unicode escapes][43716]
5146 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5147 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5151 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5152 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5153 This should decrease compile times for debug builds.
5154 - [strict memory alignment now enabled on ARMv6][45094]
5155 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5159 - [Allow atomic operations up to 32 bits
5160 on `armv5te_unknown_linux_gnueabi`][44978]
5161 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5162 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5163 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5164 - [Properly detect overflow in `Instant += Duration`.][44220]
5165 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5166 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5167 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5174 - [Cargo will now build multi file examples in subdirectories of the `examples`
5175 folder that have a `main.rs` file.][cargo/4496]
5176 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5177 the old format will continue to work and can be updated with `cargo update`.
5178 - [Now supports vendoring git repositories][cargo/3992]
5182 - [`libbacktrace` is now available on Apple platforms.][44251]
5183 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5184 This now lets you specify that a given code example will fail to compile.
5188 - [The minimum Android version that rustc can build for has been bumped
5189 to `4.0` from `2.3`][45656]
5190 - [Allowing `T op= &T` for numeric types has broken some type
5191 inference cases][45480]
5194 [42526]: https://github.com/rust-lang/rust/pull/42526
5195 [43716]: https://github.com/rust-lang/rust/pull/43716
5196 [43949]: https://github.com/rust-lang/rust/pull/43949
5197 [44015]: https://github.com/rust-lang/rust/pull/44015
5198 [44220]: https://github.com/rust-lang/rust/pull/44220
5199 [44251]: https://github.com/rust-lang/rust/pull/44251
5200 [44287]: https://github.com/rust-lang/rust/pull/44287
5201 [44303]: https://github.com/rust-lang/rust/pull/44303
5202 [44456]: https://github.com/rust-lang/rust/pull/44456
5203 [44466]: https://github.com/rust-lang/rust/pull/44466
5204 [44895]: https://github.com/rust-lang/rust/pull/44895
5205 [44966]: https://github.com/rust-lang/rust/pull/44966
5206 [44978]: https://github.com/rust-lang/rust/pull/44978
5207 [45041]: https://github.com/rust-lang/rust/pull/45041
5208 [45064]: https://github.com/rust-lang/rust/pull/45064
5209 [45075]: https://github.com/rust-lang/rust/pull/45075
5210 [45094]: https://github.com/rust-lang/rust/pull/45094
5211 [45095]: https://github.com/rust-lang/rust/pull/45095
5212 [45480]: https://github.com/rust-lang/rust/issues/45480
5213 [45656]: https://github.com/rust-lang/rust/pull/45656
5214 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5215 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5216 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5223 Version 1.21.0 (2017-10-12)
5224 ==========================
5228 - [You can now use static references for literals.][43838]
5232 let x: &'static u32 = &0;
5235 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5238 my_macro!(Vec<i32>::new); // Always worked
5239 my_macro!(Vec::<i32>::new); // Now works
5244 - [Upgraded jemalloc to 4.5.0][43911]
5245 - [Enabled unwinding panics on Redox][43917]
5246 - [Now runs LLVM in parallel during translation phase.][43506]
5247 This should reduce peak memory usage.
5251 - [Generate builtin impls for `Clone` for all arrays and tuples that
5252 are `T: Clone`][43690]
5253 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5254 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5255 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5260 [`std::mem::discriminant`]
5264 - [You can now call `cargo install` with multiple package names][cargo/4216]
5265 - [Cargo commands inside a virtual workspace will now implicitly
5266 pass `--all`][cargo/4335]
5267 - [Added a `[patch]` section to `Cargo.toml` to handle
5268 prepublication dependencies][cargo/4123] [RFC 1969]
5269 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5270 like patterns][cargo/4270]
5271 - [Added the `--all-targets` option][cargo/4400]
5272 - [Using required dependencies as a feature is now deprecated and emits
5273 a warning][cargo/4364]
5278 - [Cargo docs are moving][43916]
5279 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5280 - [The rustdoc book is now available][43863]
5281 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5282 - [Added a preview of RLS has been made available through rustup][44204]
5283 Install with `rustup component add rls-preview`
5284 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5285 Previously only showed `std::os::unix`.
5289 - [Changes in method matching against higher-ranked types][43880] This may cause
5290 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5291 - [rustc's JSON error output's byte position start at top of file.][42973]
5292 Was previously relative to the rustc's internal `CodeMap` struct which
5293 required the unstable library `libsyntax` to correctly use.
5294 - [`unused_results` lint no longer ignores booleans][43728]
5296 [42565]: https://github.com/rust-lang/rust/pull/42565
5297 [42973]: https://github.com/rust-lang/rust/pull/42973
5298 [43348]: https://github.com/rust-lang/rust/pull/43348
5299 [43459]: https://github.com/rust-lang/rust/pull/43459
5300 [43506]: https://github.com/rust-lang/rust/pull/43506
5301 [43540]: https://github.com/rust-lang/rust/pull/43540
5302 [43690]: https://github.com/rust-lang/rust/pull/43690
5303 [43728]: https://github.com/rust-lang/rust/pull/43728
5304 [43838]: https://github.com/rust-lang/rust/pull/43838
5305 [43863]: https://github.com/rust-lang/rust/pull/43863
5306 [43880]: https://github.com/rust-lang/rust/pull/43880
5307 [43911]: https://github.com/rust-lang/rust/pull/43911
5308 [43916]: https://github.com/rust-lang/rust/pull/43916
5309 [43917]: https://github.com/rust-lang/rust/pull/43917
5310 [44204]: https://github.com/rust-lang/rust/pull/44204
5311 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5312 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5313 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5314 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5315 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5316 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5317 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5318 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5319 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5321 Version 1.20.0 (2017-08-31)
5322 ===========================
5326 - [Associated constants are now stabilised.][42809]
5327 - [A lot of macro bugs are now fixed.][42913]
5332 - [Struct fields are now properly coerced to the expected field type.][42807]
5333 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5334 `wasm32-experimental-emscripten` target.
5335 - [Changed some of the error messages to be more helpful.][42033]
5336 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5338 - [rustc now reports the total number of errors on compilation failure][43015]
5339 previously this was only the number of errors in the pass that failed.
5340 - [Expansion in rustc has been sped up 29x.][42533]
5341 - [added `msp430-none-elf` target.][43099]
5342 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5344 - [Fixes backtraces on Redox][43228]
5345 - [rustc now identifies different versions of same crate when absolute paths of
5346 different types match in an error message.][42826]
5352 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5353 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5355 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5356 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5357 - [Impl `Clone` for `DefaultHasher`.][42799]
5358 - [Impl `Sync` for `SyncSender`.][42397]
5359 - [Impl `FromStr` for `char`][42271]
5360 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5362 - [allow messages in the `unimplemented!()` macro.][42155]
5363 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5364 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5365 - [Upgrade to Unicode 10.0.0][42999]
5366 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5367 - [Skip the main thread's manual stack guard on Linux][43072]
5368 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5369 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5371 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5376 - [`CStr::into_c_string`]
5377 - [`CString::as_c_str`]
5378 - [`CString::into_boxed_c_str`]
5379 - [`Chain::get_mut`]
5380 - [`Chain::get_ref`]
5381 - [`Chain::into_inner`]
5382 - [`Option::get_or_insert_with`]
5383 - [`Option::get_or_insert`]
5384 - [`OsStr::into_os_string`]
5385 - [`OsString::into_boxed_os_str`]
5388 - [`Utf8Error::error_len`]
5389 - [`char::EscapeDebug`]
5390 - [`char::escape_debug`]
5391 - [`compile_error!`]
5392 - [`f32::from_bits`]
5394 - [`f64::from_bits`]
5396 - [`mem::ManuallyDrop`]
5397 - [`slice::sort_unstable_by_key`]
5398 - [`slice::sort_unstable_by`]
5399 - [`slice::sort_unstable`]
5400 - [`str::from_boxed_utf8_unchecked`]
5401 - [`str::as_bytes_mut`]
5402 - [`str::as_bytes_mut`]
5403 - [`str::from_utf8_mut`]
5404 - [`str::from_utf8_unchecked_mut`]
5406 - [`str::get_unchecked_mut`]
5407 - [`str::get_unchecked`]
5409 - [`str::into_boxed_bytes`]
5414 - [Cargo API token location moved from `~/.cargo/config` to
5415 `~/.cargo/credentials`.][cargo/3978]
5416 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5417 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5418 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5419 - [You can now specify version of a binary when installed through
5420 `cargo install` using `--vers`.][cargo/4229]
5421 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5422 failure.][cargo/4248]
5423 - [Changed the convention around which file is the crate root.][cargo/4259]
5428 - [Functions with `'static` in their return types will now not be as usable as
5429 if they were using lifetime parameters instead.][42417]
5430 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5431 takes the sign of NaN into account where previously didn't.][42430]
5433 [42033]: https://github.com/rust-lang/rust/pull/42033
5434 [42155]: https://github.com/rust-lang/rust/pull/42155
5435 [42271]: https://github.com/rust-lang/rust/pull/42271
5436 [42397]: https://github.com/rust-lang/rust/pull/42397
5437 [42417]: https://github.com/rust-lang/rust/pull/42417
5438 [42430]: https://github.com/rust-lang/rust/pull/42430
5439 [42431]: https://github.com/rust-lang/rust/pull/42431
5440 [42533]: https://github.com/rust-lang/rust/pull/42533
5441 [42571]: https://github.com/rust-lang/rust/pull/42571
5442 [42613]: https://github.com/rust-lang/rust/pull/42613
5443 [42799]: https://github.com/rust-lang/rust/pull/42799
5444 [42807]: https://github.com/rust-lang/rust/pull/42807
5445 [42809]: https://github.com/rust-lang/rust/pull/42809
5446 [42822]: https://github.com/rust-lang/rust/pull/42822
5447 [42826]: https://github.com/rust-lang/rust/pull/42826
5448 [42854]: https://github.com/rust-lang/rust/pull/42854
5449 [42913]: https://github.com/rust-lang/rust/pull/42913
5450 [42999]: https://github.com/rust-lang/rust/pull/42999
5451 [43011]: https://github.com/rust-lang/rust/pull/43011
5452 [43015]: https://github.com/rust-lang/rust/pull/43015
5453 [43072]: https://github.com/rust-lang/rust/pull/43072
5454 [43077]: https://github.com/rust-lang/rust/pull/43077
5455 [43097]: https://github.com/rust-lang/rust/pull/43097
5456 [43099]: https://github.com/rust-lang/rust/pull/43099
5457 [43170]: https://github.com/rust-lang/rust/pull/43170
5458 [43178]: https://github.com/rust-lang/rust/pull/43178
5459 [43185]: https://github.com/rust-lang/rust/pull/43185
5460 [43228]: https://github.com/rust-lang/rust/pull/43228
5461 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5462 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5463 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5464 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5465 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5466 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5467 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5468 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5469 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5470 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5471 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5472 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5473 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5474 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5475 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5476 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5477 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5478 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5479 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5480 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5481 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5482 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5483 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5484 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5485 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5486 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5487 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5488 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5489 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5490 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5491 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5492 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5493 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5494 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5495 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5496 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5497 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5498 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5501 Version 1.19.0 (2017-07-20)
5502 ===========================
5507 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5508 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5509 - [Macro recursion limit increased to 1024 from 64.][41676]
5510 - [Added lint for detecting unused macros.][41907]
5511 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5512 For example: `let x = loop { break 7; };`
5513 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5514 contain `Copy` types and cannot have a `Drop` implementation.
5515 Example: `union Foo { bar: u8, baz: usize }`
5516 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5517 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5522 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5523 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5524 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5525 you should use `--target armv7-linux-androideabi`.
5526 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5527 - [Minor optimisation of string operations.][42037]
5528 - [Compiler error message is now `aborting due to previous error(s)` instead of
5529 `aborting due to N previous errors`][42150] This was previously inaccurate and
5530 would only count certain kinds of errors.
5531 - [The compiler now supports Visual Studio 2017][42225]
5532 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5533 - [Added a lot][42264] of [new error codes][42302]
5534 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5535 libraries with C Run-time Libraries(CRT) to be statically linked.
5536 - [Fixed various ARM codegen bugs][42740]
5541 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5542 `Extend<Cow<'a, str>>`][41449]
5543 - [`Vec` now implements `From<&mut [T]>`][41530]
5544 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5545 - [`SplitWhitespace` now implements `Clone`][41659]
5546 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5548 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5549 macros, but for printing to stderr.
5554 - [`OsString::shrink_to_fit`]
5557 - [`thread::ThreadId`]
5562 - [Build scripts can now add environment variables to the environment
5563 the crate is being compiled in.
5564 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5565 - [Subcommands now replace the current process rather than spawning a new
5566 child process][cargo/3970]
5567 - [Workspace members can now accept glob file patterns][cargo/3979]
5568 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5569 the members in a given workspace.][cargo/3988]
5570 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5571 - [Target directory path is now in the cargo metadata][cargo/4022]
5572 - [Cargo no longer checks out a local working directory for the
5573 crates.io index][cargo/4026] This should provide smaller file size for the
5574 registry, and improve cloning times, especially on Windows machines.
5575 - [Added an `--exclude` option for excluding certain packages when using the
5576 `--all` option][cargo/4031]
5577 - [Cargo will now automatically retry when receiving a 5xx error
5578 from crates.io][cargo/4032]
5579 - [The `--features` option now accepts multiple comma or space
5580 delimited values.][cargo/4084]
5581 - [Added support for custom target specific runners][cargo/3954]
5586 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5588 - [Rust will now release XZ compressed packages][rust-installer/57]
5589 - [rustup will now prefer to download rust packages with
5590 XZ compression][rustup/1100] over GZip packages.
5591 - [Added the ability to escape `#` in rust documentation][41785] By adding
5592 additional `#`'s ie. `##` is now `#`
5597 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5598 - [`-Z` flags are now no longer allowed to be used on the stable
5599 compiler.][41751] This has been a warning for a year previous to this.
5600 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5601 longer works][42844]. Users should migrate to the built-in `check`
5602 command, which has been available since 1.16.
5603 - [Ending a float literal with `._` is now a hard error.
5604 Example: `42._` .][41946]
5605 - [Any use of a private `extern crate` outside of its module is now a
5606 hard error.][36886] This was previously a warning.
5607 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5608 relative while the `::` prefix makes a path absolute, but was ignored and the
5609 path was relative regardless.
5610 - [Floating point constants in match patterns is now a hard error][36890]
5611 This was previously a warning.
5612 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5613 match patterns is now a hard error][36891] This was previously a warning.
5614 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5616 - [From the pound escape, lines consisting of multiple `#`s are
5618 - [It is an error to re-export private enum variants][42460]. This is
5619 known to break a number of crates that depend on an older version of
5621 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5622 to use it to find the linker, and the build will fail where it did
5623 not previously][42607]
5625 [36886]: https://github.com/rust-lang/rust/issues/36886
5626 [36888]: https://github.com/rust-lang/rust/issues/36888
5627 [36890]: https://github.com/rust-lang/rust/issues/36890
5628 [36891]: https://github.com/rust-lang/rust/issues/36891
5629 [36892]: https://github.com/rust-lang/rust/issues/36892
5630 [37406]: https://github.com/rust-lang/rust/issues/37406
5631 [39983]: https://github.com/rust-lang/rust/pull/39983
5632 [41145]: https://github.com/rust-lang/rust/pull/41145
5633 [41192]: https://github.com/rust-lang/rust/pull/41192
5634 [41258]: https://github.com/rust-lang/rust/pull/41258
5635 [41370]: https://github.com/rust-lang/rust/pull/41370
5636 [41449]: https://github.com/rust-lang/rust/pull/41449
5637 [41530]: https://github.com/rust-lang/rust/pull/41530
5638 [41624]: https://github.com/rust-lang/rust/pull/41624
5639 [41656]: https://github.com/rust-lang/rust/pull/41656
5640 [41659]: https://github.com/rust-lang/rust/pull/41659
5641 [41676]: https://github.com/rust-lang/rust/pull/41676
5642 [41751]: https://github.com/rust-lang/rust/pull/41751
5643 [41764]: https://github.com/rust-lang/rust/pull/41764
5644 [41785]: https://github.com/rust-lang/rust/pull/41785
5645 [41873]: https://github.com/rust-lang/rust/pull/41873
5646 [41907]: https://github.com/rust-lang/rust/pull/41907
5647 [41946]: https://github.com/rust-lang/rust/pull/41946
5648 [42016]: https://github.com/rust-lang/rust/pull/42016
5649 [42037]: https://github.com/rust-lang/rust/pull/42037
5650 [42068]: https://github.com/rust-lang/rust/pull/42068
5651 [42150]: https://github.com/rust-lang/rust/pull/42150
5652 [42162]: https://github.com/rust-lang/rust/pull/42162
5653 [42225]: https://github.com/rust-lang/rust/pull/42225
5654 [42264]: https://github.com/rust-lang/rust/pull/42264
5655 [42302]: https://github.com/rust-lang/rust/pull/42302
5656 [42460]: https://github.com/rust-lang/rust/issues/42460
5657 [42607]: https://github.com/rust-lang/rust/issues/42607
5658 [42740]: https://github.com/rust-lang/rust/pull/42740
5659 [42844]: https://github.com/rust-lang/rust/issues/42844
5660 [42948]: https://github.com/rust-lang/rust/pull/42948
5661 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5662 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5663 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5664 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5665 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5666 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5667 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5668 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5669 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5670 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5671 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5672 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5673 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5674 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5675 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5676 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5677 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5678 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5679 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5680 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5681 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5682 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5685 Version 1.18.0 (2017-06-08)
5686 ===========================
5691 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5692 make the item visible to just that module tree. Also accepts the keyword
5693 `crate` to make something public to the whole crate but not users of the
5694 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5695 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5696 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5697 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5698 types like `Write + Send`, trailing `+` are now supported in trait objects,
5699 and better error reporting for trait objects starting with `?Sized`.
5700 - [0e+10 is now a valid floating point literal][40589]
5701 - [Now warns if you bind a lifetime parameter to 'static][40734]
5702 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5703 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5704 representation in some cases.][40377]
5709 - [rustc can now emit mir with `--emit mir`][39891]
5710 - [Improved LLVM IR for trivial functions][40367]
5711 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5712 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5713 opportunities found through profiling
5714 - [Improved backtrace formatting when panicking][38165]
5719 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5720 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5721 iteration or reallocation.
5722 - [Simplified HashMap Bucket interface][40561] provides performance
5723 improvements for iterating and cloning.
5724 - [Specialize Vec::from_elem to use calloc][40409]
5725 - [Fixed Race condition in fs::create_dir_all][39799]
5726 - [No longer caching stdio on Windows][40516]
5727 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5728 2.50%~ faster and in one case now 12.50% faster.
5729 - [Optimized `AtomicBool::fetch_nand`][41143]
5734 - [`Child::try_wait`]
5735 - [`HashMap::retain`]
5736 - [`HashSet::retain`]
5738 - [`TcpStream::peek`]
5739 - [`UdpSocket::peek`]
5740 - [`UdpSocket::peek_from`]
5745 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5746 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5747 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5748 - [Added Android build support][cargo/3885]
5749 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5750 of a certain type, for example `cargo build --bins` will build all
5752 - [Added support for haiku][cargo/3952]
5757 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5758 - [Added rust-windbg script for better debugging on Windows][39983]
5759 - [Rust now uses the official cross compiler for NetBSD][40612]
5760 - [rustdoc now accepts `#` at the start of files][40828]
5761 - [Fixed jemalloc support for musl][41168]
5766 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5767 always placed after the sign if it exists and before the digits. With the `#`
5768 flag the zeroes are placed after the prefix and before the digits.
5769 - [Due to the struct field optimisation][40377], using `transmute` on structs
5770 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5771 always been undefined behavior, but is now more likely to break in practice.
5772 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5773 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5774 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5775 - [Overlapping inherent `impl`s are now a hard error][40728]
5776 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5777 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5778 `out.asm` and `out.ll` instead of only one of the filetypes.
5779 - [ calling a function that returns `Self` will no longer work][41805] when
5780 the size of `Self` cannot be statically determined.
5781 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5782 this has caused a few regressions namely:
5784 - Changed the link order of local static/dynamic libraries (respecting the
5785 order on given rather than having the compiler reorder).
5786 - Changed how MinGW is linked, native code linked to dynamic libraries
5787 may require manually linking to the gcc support library (for the native
5790 [38165]: https://github.com/rust-lang/rust/pull/38165
5791 [39799]: https://github.com/rust-lang/rust/pull/39799
5792 [39891]: https://github.com/rust-lang/rust/pull/39891
5793 [39983]: https://github.com/rust-lang/rust/pull/39983
5794 [40043]: https://github.com/rust-lang/rust/pull/40043
5795 [40241]: https://github.com/rust-lang/rust/pull/40241
5796 [40338]: https://github.com/rust-lang/rust/pull/40338
5797 [40367]: https://github.com/rust-lang/rust/pull/40367
5798 [40377]: https://github.com/rust-lang/rust/pull/40377
5799 [40409]: https://github.com/rust-lang/rust/pull/40409
5800 [40516]: https://github.com/rust-lang/rust/pull/40516
5801 [40556]: https://github.com/rust-lang/rust/pull/40556
5802 [40561]: https://github.com/rust-lang/rust/pull/40561
5803 [40589]: https://github.com/rust-lang/rust/pull/40589
5804 [40612]: https://github.com/rust-lang/rust/pull/40612
5805 [40723]: https://github.com/rust-lang/rust/pull/40723
5806 [40728]: https://github.com/rust-lang/rust/pull/40728
5807 [40731]: https://github.com/rust-lang/rust/pull/40731
5808 [40734]: https://github.com/rust-lang/rust/pull/40734
5809 [40805]: https://github.com/rust-lang/rust/pull/40805
5810 [40807]: https://github.com/rust-lang/rust/pull/40807
5811 [40828]: https://github.com/rust-lang/rust/pull/40828
5812 [40870]: https://github.com/rust-lang/rust/pull/40870
5813 [41085]: https://github.com/rust-lang/rust/pull/41085
5814 [41143]: https://github.com/rust-lang/rust/pull/41143
5815 [41168]: https://github.com/rust-lang/rust/pull/41168
5816 [41270]: https://github.com/rust-lang/rust/issues/41270
5817 [41469]: https://github.com/rust-lang/rust/pull/41469
5818 [41805]: https://github.com/rust-lang/rust/issues/41805
5819 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5820 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5821 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5822 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5823 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5824 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5825 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5826 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5827 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5828 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5829 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5830 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5831 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5832 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5835 Version 1.17.0 (2017-04-27)
5836 ===========================
5841 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5842 * [Fields of structs may be initialized without duplicating the field/variable
5843 names][39761]. [RFC 1682]
5844 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5845 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5846 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5847 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5848 `'b`. Soundness fix.
5849 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5850 * [Static variables may contain references to other statics][40027]
5855 * [Exit quickly on only `--emit dep-info`][40336]
5856 * [Make `-C relocation-model` more correctly determine whether the linker
5857 creates a position-independent executable][40245]
5858 * [Add `-C overflow-checks` to directly control whether integer overflow
5860 * [The rustc type checker now checks items on demand instead of in a single
5861 in-order pass][40008]. This is mostly an internal refactoring in support of
5862 future work, including incremental type checking, but also resolves [RFC
5863 1647], allowing `Self` to appear in `impl` `where` clauses.
5864 * [Optimize vtable loads][39995]
5865 * [Turn off vectorization for Emscripten targets][39990]
5866 * [Provide suggestions for unknown macros imported with `use`][39953]
5867 * [Fix ICEs in path resolution][39939]
5868 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5869 * [Add clearer error message using `&str + &str`][39116]
5880 * [`Ordering::then`]
5881 * [`Ordering::then_with`]
5882 * [`BTreeMap::range`]
5883 * [`BTreeMap::range_mut`]
5884 * [`collections::Bound`]
5885 * [`process::abort`]
5886 * [`ptr::read_unaligned`]
5887 * [`ptr::write_unaligned`]
5888 * [`Result::expect_err`]
5891 * [`Cell::into_inner`]
5897 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5898 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5899 * [`String` implements `FromIterator<&char>`][40028]
5900 * `Box` [implements][40009] a number of new conversions:
5901 `From<Box<str>> for String`,
5902 `From<Box<[T]>> for Vec<T>`,
5903 `From<Box<CStr>> for CString`,
5904 `From<Box<OsStr>> for OsString`,
5905 `From<Box<Path>> for PathBuf`,
5906 `Into<Box<str>> for String`,
5907 `Into<Box<[T]>> for Vec<T>`,
5908 `Into<Box<CStr>> for CString`,
5909 `Into<Box<OsStr>> for OsString`,
5910 `Into<Box<Path>> for PathBuf`,
5911 `Default for Box<str>`,
5912 `Default for Box<CStr>`,
5913 `Default for Box<OsStr>`,
5914 `From<&CStr> for Box<CStr>`,
5915 `From<&OsStr> for Box<OsStr>`,
5916 `From<&Path> for Box<Path>`
5917 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5918 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5919 * [Slightly optimize `slice::sort`][39538]
5920 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5921 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5922 `Box<str>` implements `From<&str>`][39438]
5923 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5924 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5925 * [`format!` estimates the needed capacity before writing a string][39356]
5926 * [Support unprivileged symlink creation in Windows][38921]
5927 * [`PathBuf` implements `Default`][38764]
5928 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5929 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5930 and poor hash functions.
5935 * [Add `cargo check --all`][cargo/3731]
5936 * [Add an option to ignore SSL revocation checking][cargo/3699]
5937 * [Add `cargo run --package`][cargo/3691]
5938 * [Add `required_features`][cargo/3667]
5939 * [Assume `build.rs` is a build script][cargo/3664]
5940 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5945 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5947 * [The "Unstable Book" documents nightly-only features][ubook]
5948 * [Improve the style of the sidebar in rustdoc output][40265]
5949 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5950 * [Fix MSP430 breakage due to `i128`][40257]
5951 * [Preliminary Solaris/SPARCv9 support][39903]
5952 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5953 run without installing the MSVC runtime.
5954 * [`rustdoc --test` includes file names in test names][39788]
5955 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5956 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5957 * [Initial support for `aarch64-unknown-freebsd`][39491]
5958 * [Initial support for `i686-unknown-netbsd`][39426]
5959 * [This release no longer includes the old makefile build system][39431]. Rust
5960 is built with a custom build system, written in Rust, and with Cargo.
5961 * [Add Debug implementations for libcollection structs][39002]
5962 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5963 * [`--test-threads=0` produces an error][38945]
5964 * [`rustup` installs documentation by default][40526]
5965 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5966 WinDbg and Visual Studio to improve the debugging experience.
5971 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5972 workaround, either use MSVC 2015 or run vcvars.bat.
5973 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5974 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5975 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5977 * [`format!` and `Display::to_string` panic if an underlying formatting
5978 implementation returns an error][40117]. Previously the error was silently
5979 ignored. It is incorrect for `write_fmt` to return an error when writing
5981 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5982 crates were marked stable and could be accessed from the stable toolchain.
5983 * [Rust git source no longer includes vendored crates][39728]. Those that need
5984 to build with vendored crates should build from release tarballs.
5985 * [Fix inert attributes from `proc_macro_derives`][39572]
5986 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5987 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5989 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5990 existing code generally ignores the type of dead-code unless a type-hint is
5991 provided; this can cause surprising inference interactions particularly around
5992 defaulting. The new code uniformly ignores the result type of dead-code.
5993 * [Tuple-struct constructors with private fields are no longer visible][38932]
5994 * [Lifetime parameters that do not appear in the arguments are now considered
5995 early-bound][38897], resolving a soundness bug (#[32330]). The
5996 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5998 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5999 * [Make transmuting from fn item types to pointer-sized types a hard
6002 [27787]: https://github.com/rust-lang/rust/issues/27787
6003 [32330]: https://github.com/rust-lang/rust/issues/32330
6004 [34198]: https://github.com/rust-lang/rust/pull/34198
6005 [38161]: https://github.com/rust-lang/rust/pull/38161
6006 [38368]: https://github.com/rust-lang/rust/pull/38368
6007 [38584]: https://github.com/rust-lang/rust/issues/38584
6008 [38661]: https://github.com/rust-lang/rust/pull/38661
6009 [38764]: https://github.com/rust-lang/rust/pull/38764
6010 [38864]: https://github.com/rust-lang/rust/issues/38864
6011 [38897]: https://github.com/rust-lang/rust/pull/38897
6012 [38921]: https://github.com/rust-lang/rust/pull/38921
6013 [38932]: https://github.com/rust-lang/rust/pull/38932
6014 [38945]: https://github.com/rust-lang/rust/pull/38945
6015 [38981]: https://github.com/rust-lang/rust/pull/38981
6016 [39002]: https://github.com/rust-lang/rust/pull/39002
6017 [39116]: https://github.com/rust-lang/rust/pull/39116
6018 [39193]: https://github.com/rust-lang/rust/pull/39193
6019 [39265]: https://github.com/rust-lang/rust/pull/39265
6020 [39356]: https://github.com/rust-lang/rust/pull/39356
6021 [39372]: https://github.com/rust-lang/rust/pull/39372
6022 [39426]: https://github.com/rust-lang/rust/pull/39426
6023 [39431]: https://github.com/rust-lang/rust/pull/39431
6024 [39438]: https://github.com/rust-lang/rust/pull/39438
6025 [39440]: https://github.com/rust-lang/rust/pull/39440
6026 [39485]: https://github.com/rust-lang/rust/pull/39485
6027 [39491]: https://github.com/rust-lang/rust/pull/39491
6028 [39518]: https://github.com/rust-lang/rust/pull/39518
6029 [39538]: https://github.com/rust-lang/rust/pull/39538
6030 [39572]: https://github.com/rust-lang/rust/pull/39572
6031 [39633]: https://github.com/rust-lang/rust/pull/39633
6032 [39642]: https://github.com/rust-lang/rust/pull/39642
6033 [39728]: https://github.com/rust-lang/rust/pull/39728
6034 [39761]: https://github.com/rust-lang/rust/pull/39761
6035 [39788]: https://github.com/rust-lang/rust/pull/39788
6036 [39793]: https://github.com/rust-lang/rust/pull/39793
6037 [39837]: https://github.com/rust-lang/rust/pull/39837
6038 [39843]: https://github.com/rust-lang/rust/pull/39843
6039 [39851]: https://github.com/rust-lang/rust/pull/39851
6040 [39903]: https://github.com/rust-lang/rust/pull/39903
6041 [39939]: https://github.com/rust-lang/rust/pull/39939
6042 [39953]: https://github.com/rust-lang/rust/pull/39953
6043 [39960]: https://github.com/rust-lang/rust/pull/39960
6044 [39990]: https://github.com/rust-lang/rust/pull/39990
6045 [39995]: https://github.com/rust-lang/rust/pull/39995
6046 [40008]: https://github.com/rust-lang/rust/pull/40008
6047 [40009]: https://github.com/rust-lang/rust/pull/40009
6048 [40027]: https://github.com/rust-lang/rust/pull/40027
6049 [40028]: https://github.com/rust-lang/rust/pull/40028
6050 [40037]: https://github.com/rust-lang/rust/pull/40037
6051 [40117]: https://github.com/rust-lang/rust/pull/40117
6052 [40166]: https://github.com/rust-lang/rust/pull/40166
6053 [40245]: https://github.com/rust-lang/rust/pull/40245
6054 [40257]: https://github.com/rust-lang/rust/pull/40257
6055 [40261]: https://github.com/rust-lang/rust/pull/40261
6056 [40265]: https://github.com/rust-lang/rust/pull/40265
6057 [40319]: https://github.com/rust-lang/rust/pull/40319
6058 [40336]: https://github.com/rust-lang/rust/pull/40336
6059 [40526]: https://github.com/rust-lang/rust/pull/40526
6060 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6061 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6062 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6063 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6064 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6065 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6066 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6067 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6068 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6069 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6070 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6071 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6072 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6073 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6074 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6075 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6076 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6077 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6078 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6079 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6080 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6081 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6082 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6083 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6084 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6085 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6086 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6087 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6088 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6089 [ubook]: https://doc.rust-lang.org/unstable-book/
6092 Version 1.16.0 (2017-03-16)
6093 ===========================
6098 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6099 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6100 match patterns][38069]
6101 * [Clean up semantics of `self` in an import list][38313]
6102 * [`Self` may appear in `impl` headers][38920]
6103 * [`Self` may appear in struct expressions][39282]
6108 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6109 a `.rmeta` file containing only crate metadata][38571]. This can be
6110 used by tools like the Rust Language Service to perform
6111 metadata-only builds.
6112 * [Levenshtein based typo suggestions now work in most places, while
6113 previously they worked only for fields and sometimes for local
6114 variables][38927]. Together with the overhaul of "no
6115 resolution"/"unexpected resolution" errors (#[38154]) they result in
6116 large and systematic improvement in resolution diagnostics.
6117 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6119 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6120 * [`rustc` no longer attempts to provide "consider using an explicit
6121 lifetime" suggestions][37057]. They were inaccurate.
6126 * [`VecDeque::truncate`]
6127 * [`VecDeque::resize`]
6128 * [`String::insert_str`]
6129 * [`Duration::checked_add`]
6130 * [`Duration::checked_sub`]
6131 * [`Duration::checked_div`]
6132 * [`Duration::checked_mul`]
6135 * [`SocketAddr::is_ipv4`]
6136 * [`SocketAddr::is_ipv6`]
6137 * [`IpAddr::is_ipv4`]
6138 * [`IpAddr::is_ipv6`]
6140 * [`Vec::dedup_by_key`]
6141 * [`Result::unwrap_or_default`]
6142 * [`<*const T>::wrapping_offset`]
6143 * [`<*mut T>::wrapping_offset`]
6144 * `CommandExt::creation_flags`
6145 * [`File::set_permissions`]
6146 * [`String::split_off`]
6151 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6152 their argument by `Borrow` parameter][37761]
6153 * [All public types in std implement `Debug`][38006]
6154 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6155 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6156 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6158 * [std: Fix partial writes in `LineWriter`][38062]
6159 * [std: Clamp max read/write sizes on Unix][38062]
6160 * [Use more specific panic message for `&str` slicing errors][38066]
6161 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6162 functionality cannot be achieved in std currently.
6163 * [`writeln!`, like `println!`, now accepts a form with no string
6164 or formatting arguments, to just print a newline][38469]
6165 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6166 * [Reduce the size of static data in `std_unicode::tables`][38781]
6167 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6168 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6170 * [`Duration` implements `Sum`][38712]
6171 * [`String` implements `ToSocketAddrs`][39048]
6176 * [The `cargo check` command does a type check of a project without
6177 building it][cargo/3296]
6178 * [crates.io will display CI badges from Travis and AppVeyor, if
6179 specified in Cargo.toml][cargo/3546]
6180 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6181 * [Compilation profiles accept integer values for `debug`, in addition
6182 to `true` and `false`. These are passed to `rustc` as the value to
6183 `-C debuginfo`][cargo/3534]
6184 * [Implement `cargo --version --verbose`][cargo/3604]
6185 * [All builds now output 'dep-info' build dependencies compatible with
6186 make and ninja][cargo/3557]
6187 * [Build all workspace members with `build --all`][cargo/3511]
6188 * [Document all workspace members with `doc --all`][cargo/3515]
6189 * [Path deps outside workspace are not members][cargo/3443]
6194 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6195 the path to the Rust implementation][38589]
6196 * [The `armv7-linux-androideabi` target no longer enables NEON
6197 extensions, per Google's ABI guide][38413]
6198 * [The stock standard library can be compiled for Redox OS][38401]
6199 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6201 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6203 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6208 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6209 match patterns][38069]
6210 * In this release, references to uninhabited types can not be
6211 pattern-matched. This was accidentally allowed in 1.15.
6212 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6213 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6215 * [Clean up semantics of `self` in an import list][38313]
6216 * Reimplemented lifetime elision. This change was almost entirely compatible
6217 with existing code, but it did close a number of small bugs and loopholes,
6218 as well as being more accepting in some other [cases][41105].
6220 [37057]: https://github.com/rust-lang/rust/pull/37057
6221 [37761]: https://github.com/rust-lang/rust/pull/37761
6222 [38006]: https://github.com/rust-lang/rust/pull/38006
6223 [38051]: https://github.com/rust-lang/rust/pull/38051
6224 [38062]: https://github.com/rust-lang/rust/pull/38062
6225 [38062]: https://github.com/rust-lang/rust/pull/38622
6226 [38066]: https://github.com/rust-lang/rust/pull/38066
6227 [38069]: https://github.com/rust-lang/rust/pull/38069
6228 [38131]: https://github.com/rust-lang/rust/pull/38131
6229 [38154]: https://github.com/rust-lang/rust/pull/38154
6230 [38274]: https://github.com/rust-lang/rust/pull/38274
6231 [38304]: https://github.com/rust-lang/rust/pull/38304
6232 [38313]: https://github.com/rust-lang/rust/pull/38313
6233 [38327]: https://github.com/rust-lang/rust/pull/38327
6234 [38401]: https://github.com/rust-lang/rust/pull/38401
6235 [38413]: https://github.com/rust-lang/rust/pull/38413
6236 [38469]: https://github.com/rust-lang/rust/pull/38469
6237 [38559]: https://github.com/rust-lang/rust/pull/38559
6238 [38571]: https://github.com/rust-lang/rust/pull/38571
6239 [38580]: https://github.com/rust-lang/rust/pull/38580
6240 [38589]: https://github.com/rust-lang/rust/pull/38589
6241 [38670]: https://github.com/rust-lang/rust/pull/38670
6242 [38712]: https://github.com/rust-lang/rust/pull/38712
6243 [38726]: https://github.com/rust-lang/rust/pull/38726
6244 [38781]: https://github.com/rust-lang/rust/pull/38781
6245 [38798]: https://github.com/rust-lang/rust/pull/38798
6246 [38909]: https://github.com/rust-lang/rust/pull/38909
6247 [38920]: https://github.com/rust-lang/rust/pull/38920
6248 [38927]: https://github.com/rust-lang/rust/pull/38927
6249 [39048]: https://github.com/rust-lang/rust/pull/39048
6250 [39282]: https://github.com/rust-lang/rust/pull/39282
6251 [39379]: https://github.com/rust-lang/rust/pull/39379
6252 [41105]: https://github.com/rust-lang/rust/issues/41105
6253 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6254 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6255 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6256 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6257 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6258 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6259 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6260 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6261 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6262 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6263 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6264 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6265 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6266 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6267 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6268 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6269 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6270 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6271 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6272 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6273 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6274 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6275 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6276 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6277 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6278 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6279 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6280 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6281 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6284 Version 1.15.1 (2017-02-09)
6285 ===========================
6287 * [Fix IntoIter::as_mut_slice's signature][39466]
6288 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6290 [39466]: https://github.com/rust-lang/rust/pull/39466
6291 [39523]: https://github.com/rust-lang/rust/pull/39523
6294 Version 1.15.0 (2017-02-02)
6295 ===========================
6300 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6301 stable. This allows popular code-generating crates like Serde and Diesel to
6302 work ergonomically. [RFC 1681].
6303 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6304 with curly braces][36868]. Part of [RFC 1506].
6305 * [A number of minor changes to name resolution have been activated][37127].
6306 They add up to more consistent semantics, allowing for future evolution of
6307 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6308 details of what is different. The breaking changes here have been transitioned
6309 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6310 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6312 * [`?Sized` can be used in `where` clauses][37791]
6313 * [There is now a limit on the size of monomorphized types and it can be
6314 modified with the `#![type_size_limit]` crate attribute, similarly to
6315 the `#![recursion_limit]` attribute][37789]
6320 * [On Windows, the compiler will apply dllimport attributes when linking to
6321 extern functions][37973]. Additional attributes and flags can control which
6322 library kind is linked and its name. [RFC 1717].
6323 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6324 * [The `--test` flag works with procedural macro crates][38107]
6325 * [Fix `extern "aapcs" fn` ABI][37814]
6326 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6327 * [The `format!` expander recognizes incorrect `printf` and shell-style
6328 formatting directives and suggests the correct format][37613].
6329 * [Only report one error for all unused imports in an import list][37456]
6331 Compiler Performance
6332 --------------------
6334 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6335 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6336 * [Don't clone in `UnificationTable::probe`][37848]
6337 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6338 * [Use small vectors in type walker][37760]
6339 * [Macro expansion performance was improved][37701]
6340 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6341 * [Replace FNV with a faster hash function][37229]
6346 * [`std::iter::Iterator::min_by`]
6347 * [`std::iter::Iterator::max_by`]
6348 * [`std::os::*::fs::FileExt`]
6349 * [`std::sync::atomic::Atomic*::get_mut`]
6350 * [`std::sync::atomic::Atomic*::into_inner`]
6351 * [`std::vec::IntoIter::as_slice`]
6352 * [`std::vec::IntoIter::as_mut_slice`]
6353 * [`std::sync::mpsc::Receiver::try_iter`]
6354 * [`std::os::unix::process::CommandExt::before_exec`]
6355 * [`std::rc::Rc::strong_count`]
6356 * [`std::rc::Rc::weak_count`]
6357 * [`std::sync::Arc::strong_count`]
6358 * [`std::sync::Arc::weak_count`]
6359 * [`std::char::encode_utf8`]
6360 * [`std::char::encode_utf16`]
6361 * [`std::cell::Ref::clone`]
6362 * [`std::io::Take::into_inner`]
6367 * [The standard sorting algorithm has been rewritten for dramatic performance
6368 improvements][38192]. It is a hybrid merge sort, drawing influences from
6369 Timsort. Previously it was a naive merge sort.
6370 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6371 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6373 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6374 and `char_indices().last()`][37882]
6375 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6376 * [Chinese characters display correctly in `fmt::Debug`][37855]
6377 * [Derive `Default` for `Duration`][37699]
6378 * [Support creation of anonymous pipes on WinXP/2k][37677]
6379 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6380 * [Don't pass overlapped handles to processes][38835]
6385 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6386 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6387 should instead check the variable at runtime with `std::env`. That the value
6388 was set at build time was a bug, and incorrect when cross-compiling. This
6389 change is known to cause breakage.
6390 * [Add `--all` flag to `cargo test`][cargo/3221]
6391 * [Compile statically against the MSVC CRT][cargo/3363]
6392 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6393 * [Link OpenSSL statically on OSX][cargo/3311]
6394 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6395 * [Test for bad path overrides with summaries][cargo/3336]
6396 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6397 * [Fix retrying crate downloads for network errors][cargo/3348]
6398 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6399 * [Emit more info on --message-format=json][cargo/3319]
6400 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6401 * [Don't ignore errors in workspace manifest][cargo/3409]
6402 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6407 * [Test runners (binaries built with `--test`) now support a `--list` argument
6408 that lists the tests it contains][38185]
6409 * [Test runners now support a `--exact` argument that makes the test filter
6410 match exactly, instead of matching only a substring of the test name][38181]
6411 * [rustdoc supports a `--playground-url` flag][37763]
6412 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6417 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6418 continue to be used in this release by passing `--disable-rustbuild` to the
6419 configure script, but they will be deleted soon. Note that the new build
6420 system uses a different on-disk layout that will likely affect any scripts
6422 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6424 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6425 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6431 * [A number of minor changes to name resolution have been activated][37127].
6432 They add up to more consistent semantics, allowing for future evolution of
6433 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6434 details of what is different. The breaking changes here have been transitioned
6435 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6436 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6437 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6438 should instead check the variable at runtime with `std::env`. That the value
6439 was set at build time was a bug, and incorrect when cross-compiling. This
6440 change is known to cause breakage.
6441 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6442 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6443 1.10 and is now an error by default. It will become a hard error in the near
6445 * [The semantics relating modules to file system directories are changing in
6446 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6447 lint, which is a warning in this release, and will become a hard error in the
6449 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6450 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6451 the underlying iterator][37834]
6453 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6454 [33685]: https://github.com/rust-lang/rust/issues/33685
6455 [36868]: https://github.com/rust-lang/rust/pull/36868
6456 [37127]: https://github.com/rust-lang/rust/pull/37127
6457 [37229]: https://github.com/rust-lang/rust/pull/37229
6458 [37456]: https://github.com/rust-lang/rust/pull/37456
6459 [37527]: https://github.com/rust-lang/rust/pull/37527
6460 [37602]: https://github.com/rust-lang/rust/pull/37602
6461 [37613]: https://github.com/rust-lang/rust/pull/37613
6462 [37615]: https://github.com/rust-lang/rust/pull/37615
6463 [37636]: https://github.com/rust-lang/rust/pull/37636
6464 [37627]: https://github.com/rust-lang/rust/pull/37627
6465 [37642]: https://github.com/rust-lang/rust/pull/37642
6466 [37677]: https://github.com/rust-lang/rust/pull/37677
6467 [37699]: https://github.com/rust-lang/rust/pull/37699
6468 [37701]: https://github.com/rust-lang/rust/pull/37701
6469 [37705]: https://github.com/rust-lang/rust/pull/37705
6470 [37749]: https://github.com/rust-lang/rust/pull/37749
6471 [37760]: https://github.com/rust-lang/rust/pull/37760
6472 [37763]: https://github.com/rust-lang/rust/pull/37763
6473 [37764]: https://github.com/rust-lang/rust/pull/37764
6474 [37789]: https://github.com/rust-lang/rust/pull/37789
6475 [37791]: https://github.com/rust-lang/rust/pull/37791
6476 [37814]: https://github.com/rust-lang/rust/pull/37814
6477 [37817]: https://github.com/rust-lang/rust/pull/37817
6478 [37834]: https://github.com/rust-lang/rust/pull/37834
6479 [37848]: https://github.com/rust-lang/rust/pull/37848
6480 [37855]: https://github.com/rust-lang/rust/pull/37855
6481 [37882]: https://github.com/rust-lang/rust/pull/37882
6482 [37888]: https://github.com/rust-lang/rust/pull/37888
6483 [37973]: https://github.com/rust-lang/rust/pull/37973
6484 [37979]: https://github.com/rust-lang/rust/pull/37979
6485 [38086]: https://github.com/rust-lang/rust/pull/38086
6486 [38107]: https://github.com/rust-lang/rust/pull/38107
6487 [38117]: https://github.com/rust-lang/rust/pull/38117
6488 [38134]: https://github.com/rust-lang/rust/pull/38134
6489 [38146]: https://github.com/rust-lang/rust/pull/38146
6490 [38181]: https://github.com/rust-lang/rust/pull/38181
6491 [38182]: https://github.com/rust-lang/rust/pull/38182
6492 [38185]: https://github.com/rust-lang/rust/pull/38185
6493 [38192]: https://github.com/rust-lang/rust/pull/38192
6494 [38279]: https://github.com/rust-lang/rust/pull/38279
6495 [38835]: https://github.com/rust-lang/rust/pull/38835
6496 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6497 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6498 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6499 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6500 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6501 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6502 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6503 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6504 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6505 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6506 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6507 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6508 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6509 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6510 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6511 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6512 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6513 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6514 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6515 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6516 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6517 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6518 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6519 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6520 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6521 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6522 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6523 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6524 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6525 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6526 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6527 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6528 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6529 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6530 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6531 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6532 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6535 Version 1.14.0 (2016-12-22)
6536 ===========================
6541 * [`..` matches multiple tuple fields in enum variants, structs
6542 and tuples][36843]. [RFC 1492].
6543 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6544 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6545 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6546 dereferencing][36822]
6551 * [Mark enums with non-zero discriminant as non-zero][37224]
6552 * [Lower-case `static mut` names are linted like other
6553 statics and consts][37162]
6554 * [Fix ICE on some macros in const integer positions
6555 (e.g. `[u8; m!()]`)][36819]
6556 * [Improve error message and snippet for "did you mean `x`"][36798]
6557 * [Add a panic-strategy field to the target specification][36794]
6558 * [Include LLVM version in `--version --verbose`][37200]
6560 Compile-time Optimizations
6561 --------------------------
6563 * [Improve macro expansion performance][37569]
6564 * [Shrink `Expr_::ExprInlineAsm`][37445]
6565 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6566 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6567 * [Avoid more allocations when compiling html5ever][37373]
6568 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6569 * [Avoid some allocations in the macro parser][37318]
6570 * [Use a faster deflate setting][37298]
6571 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6572 during interning of slices][37270]
6573 * [Optimize `write_metadata`][37267]
6574 * [Don't process obligation forest cycles when stalled][37231]
6575 * [Avoid many `CrateConfig` clones][37161]
6576 * [Optimize `Substs::super_fold_with`][37108]
6577 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6578 * [Speed up `plug_leaks`][36917]
6583 * [`println!()`, with no arguments, prints newline][36825].
6584 Previously, an empty string was required to achieve the same.
6585 * [`Wrapping` impls standard binary and unary operators, as well as
6586 the `Sum` and `Product` iterators][37356]
6587 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6589 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6590 `VecDeque` iterators][37315]
6591 * [Improve `SipHasher` performance on small values][37312]
6592 * [Add Iterator trait TrustedLen to enable better FromIterator /
6594 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6595 * [`ReadDir` implements `Debug`][37221]
6596 * [Implement `RefUnwindSafe` for atomic types][37178]
6597 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6598 * [Avoid allocations in `Decoder::read_str`][37064]
6599 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6600 * [Impl `Debug` for raw pointers to unsized data][36880]
6601 * [Don't reuse `HashMap` random seeds][37470]
6602 * [The internal memory layout of `HashMap` is more cache-friendly, for
6603 significant improvements in some operations][36692]
6604 * [`HashMap` uses less memory on 32-bit architectures][36595]
6605 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6610 * [Expose rustc cfg values to build scripts][cargo/3243]
6611 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6612 * [Fix passing --features when testing multiple packages][cargo/3280]
6613 * [Use a single profile set per workspace][cargo/3249]
6614 * [Load `replace` sections from lock files][cargo/3220]
6615 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6620 * [rustup is the recommended Rust installation method][1.14rustup]
6621 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6622 S390x. These are [tier 2] platforms and may have major defects. Follow the
6623 instructions on the website to install, or add the targets to an existing
6624 installation with `rustup target add`. The new target triples are:
6625 - `mips-unknown-linux-gnu`
6626 - `mipsel-unknown-linux-gnu`
6627 - `mips64-unknown-linux-gnuabi64`
6628 - `mips64el-unknown-linux-gnuabi64 `
6629 - `powerpc-unknown-linux-gnu`
6630 - `powerpc64-unknown-linux-gnu`
6631 - `powerpc64le-unknown-linux-gnu`
6632 - `s390x-unknown-linux-gnu `
6633 * This release includes target (std) builds for ARM Linux running MUSL
6634 libc. These are [tier 2] platforms and may have major defects. Add the
6635 following triples to an existing rustup installation with `rustup target add`:
6636 - `arm-unknown-linux-musleabi`
6637 - `arm-unknown-linux-musleabihf`
6638 - `armv7-unknown-linux-musleabihf`
6639 * This release includes [experimental support for WebAssembly][1.14wasm], via
6640 the `wasm32-unknown-emscripten` target. This target is known to have major
6641 defects. Please test, report, and fix.
6642 * rustup no longer installs documentation by default. Run `rustup
6643 component add rust-docs` to install.
6644 * [Fix line stepping in debugger][37310]
6645 * [Enable line number debuginfo in releases][37280]
6650 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6651 * [Add support for Fuchsia OS][37313]
6652 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6657 * [A number of forward-compatibility lints used by the compiler
6658 to gradually introduce language changes have been converted
6659 to deny by default][36894]:
6660 - ["use of inaccessible extern crate erroneously allowed"][36886]
6661 - ["type parameter default erroneously allowed in invalid location"][36887]
6662 - ["detects super or self keywords at the beginning of global path"][36888]
6663 - ["two overlapping inherent impls define an item with the same name
6664 were erroneously allowed"][36889]
6665 - ["floating-point constants cannot be used in patterns"][36890]
6666 - ["constants of struct or enum type can only be used in a pattern if
6667 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6668 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6669 * [Prohibit patterns in trait methods without bodies][37378]
6670 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6671 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6672 * [The `$crate` macro variable is accepted in fewer locations][37213]
6673 * [Impls specifying extra region requirements beyond the trait
6674 they implement are rejected][37167]
6675 * [Enums may not be unsized][37111]. Unsized enums are intended to
6676 work but never have. For now they are forbidden.
6677 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6679 [tier 2]: https://forge.rust-lang.org/platform-support.html
6680 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6681 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6682 [36430]: https://github.com/rust-lang/rust/pull/36430
6683 [36595]: https://github.com/rust-lang/rust/pull/36595
6684 [36692]: https://github.com/rust-lang/rust/pull/36692
6685 [36767]: https://github.com/rust-lang/rust/pull/36767
6686 [36794]: https://github.com/rust-lang/rust/pull/36794
6687 [36798]: https://github.com/rust-lang/rust/pull/36798
6688 [36819]: https://github.com/rust-lang/rust/pull/36819
6689 [36822]: https://github.com/rust-lang/rust/pull/36822
6690 [36825]: https://github.com/rust-lang/rust/pull/36825
6691 [36843]: https://github.com/rust-lang/rust/pull/36843
6692 [36880]: https://github.com/rust-lang/rust/pull/36880
6693 [36886]: https://github.com/rust-lang/rust/issues/36886
6694 [36887]: https://github.com/rust-lang/rust/issues/36887
6695 [36888]: https://github.com/rust-lang/rust/issues/36888
6696 [36889]: https://github.com/rust-lang/rust/issues/36889
6697 [36890]: https://github.com/rust-lang/rust/issues/36890
6698 [36891]: https://github.com/rust-lang/rust/issues/36891
6699 [36892]: https://github.com/rust-lang/rust/issues/36892
6700 [36894]: https://github.com/rust-lang/rust/pull/36894
6701 [36917]: https://github.com/rust-lang/rust/pull/36917
6702 [36993]: https://github.com/rust-lang/rust/pull/36993
6703 [37037]: https://github.com/rust-lang/rust/pull/37037
6704 [37064]: https://github.com/rust-lang/rust/pull/37064
6705 [37094]: https://github.com/rust-lang/rust/pull/37094
6706 [37108]: https://github.com/rust-lang/rust/pull/37108
6707 [37111]: https://github.com/rust-lang/rust/pull/37111
6708 [37161]: https://github.com/rust-lang/rust/pull/37161
6709 [37162]: https://github.com/rust-lang/rust/pull/37162
6710 [37167]: https://github.com/rust-lang/rust/pull/37167
6711 [37178]: https://github.com/rust-lang/rust/pull/37178
6712 [37200]: https://github.com/rust-lang/rust/pull/37200
6713 [37213]: https://github.com/rust-lang/rust/pull/37213
6714 [37221]: https://github.com/rust-lang/rust/pull/37221
6715 [37224]: https://github.com/rust-lang/rust/pull/37224
6716 [37230]: https://github.com/rust-lang/rust/pull/37230
6717 [37231]: https://github.com/rust-lang/rust/pull/37231
6718 [37247]: https://github.com/rust-lang/rust/pull/37247
6719 [37267]: https://github.com/rust-lang/rust/pull/37267
6720 [37270]: https://github.com/rust-lang/rust/pull/37270
6721 [37273]: https://github.com/rust-lang/rust/pull/37273
6722 [37280]: https://github.com/rust-lang/rust/pull/37280
6723 [37298]: https://github.com/rust-lang/rust/pull/37298
6724 [37306]: https://github.com/rust-lang/rust/pull/37306
6725 [37310]: https://github.com/rust-lang/rust/pull/37310
6726 [37312]: https://github.com/rust-lang/rust/pull/37312
6727 [37313]: https://github.com/rust-lang/rust/pull/37313
6728 [37315]: https://github.com/rust-lang/rust/pull/37315
6729 [37318]: https://github.com/rust-lang/rust/pull/37318
6730 [37322]: https://github.com/rust-lang/rust/pull/37322
6731 [37326]: https://github.com/rust-lang/rust/pull/37326
6732 [37351]: https://github.com/rust-lang/rust/pull/37351
6733 [37356]: https://github.com/rust-lang/rust/pull/37356
6734 [37367]: https://github.com/rust-lang/rust/pull/37367
6735 [37373]: https://github.com/rust-lang/rust/pull/37373
6736 [37378]: https://github.com/rust-lang/rust/pull/37378
6737 [37389]: https://github.com/rust-lang/rust/pull/37389
6738 [37392]: https://github.com/rust-lang/rust/pull/37392
6739 [37427]: https://github.com/rust-lang/rust/pull/37427
6740 [37439]: https://github.com/rust-lang/rust/pull/37439
6741 [37445]: https://github.com/rust-lang/rust/pull/37445
6742 [37470]: https://github.com/rust-lang/rust/pull/37470
6743 [37569]: https://github.com/rust-lang/rust/pull/37569
6744 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6745 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6746 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6747 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6748 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6749 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6750 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6753 Version 1.13.0 (2016-11-10)
6754 ===========================
6759 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6760 errors, like the `try!` macro, described in [RFC 0243].
6761 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6762 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6763 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6764 * [Fix lifetime rules for 'if' conditions][36029]
6765 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6770 * [Add the `-C link-arg` argument][36574]
6771 * [Remove the old AST-based backend from rustc_trans][35764]
6772 * [Don't enable NEON by default on armv7 Linux][35814]
6773 * [Fix debug line number info for macro expansions][35238]
6774 * [Do not emit "class method" debuginfo for types that are not
6775 DICompositeType][36008]
6776 * [Warn about multiple conflicting #[repr] hints][34623]
6777 * [When sizing DST, don't double-count nested struct prefixes][36351]
6778 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6779 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6780 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6781 * [Expand macros without recursing to avoid stack overflows][36214]
6786 * [Replace macro backtraces with labeled local uses][35702]
6787 * [Improve error message for misplaced doc comments][33922]
6788 * [Buffer unix and lock windows to prevent message interleaving][35975]
6789 * [Update lifetime errors to specifically note temporaries][36171]
6790 * [Special case a few colors for Windows][36178]
6791 * [Suggest `use self` when such an import resolves][36289]
6792 * [Be more specific when type parameter shadows primitive type][36338]
6793 * Many minor improvements
6795 Compile-time Optimizations
6796 --------------------------
6798 * [Compute and cache HIR hashes at beginning][35854]
6799 * [Don't hash types in loan paths][36004]
6800 * [Cache projections in trans][35761]
6801 * [Optimize the parser's last token handling][36527]
6802 * [Only instantiate #[inline] functions in codegen units referencing
6803 them][36524]. This leads to big improvements in cases where crates export
6804 define many inline functions without using them directly.
6805 * [Lazily allocate TypedArena's first chunk][36592]
6806 * [Don't allocate during default HashSet creation][36734]
6813 * [`overflowing_abs`]
6814 * [`RefCell::try_borrow`]
6815 * [`RefCell::try_borrow_mut`]
6820 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6821 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6823 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6824 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6825 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6826 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6827 * [Use arc4rand on FreeBSD][35884]
6828 * [memrchr: Correct aligned offset computation][35969]
6829 * [Improve Demangling of Rust Symbols][36059]
6830 * [Use monotonic time in condition variables][35048]
6831 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6832 * [Implement conversion traits for `char`][35755]
6833 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6834 * [Zero first byte of CString on drop][36264]
6835 * [Inherit overflow checks for sum and product][36372]
6836 * [Add missing Eq implementations][36423]
6837 * [Implement `Debug` for `DirEntry`][36631]
6838 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6840 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6841 * [Implement more traits for `std::io::ErrorKind`][35911]
6842 * [Optimize BinaryHeap bounds checking][36072]
6843 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6844 `extend_with_element`][36355]
6845 * [Fix overflow checking in unsigned pow()][34942]
6850 * This release includes security fixes to both curl and OpenSSL.
6851 * [Fix transitive doctests when panic=abort][cargo/3021]
6852 * [Add --all-features flag to cargo][cargo/3038]
6853 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6854 * [Don't parse the home directory more than once][cargo/3078]
6855 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6856 * [Update OpenSSL to 1.0.2j][cargo/3121]
6857 * [Add license and license_file to cargo metadata output][cargo/3110]
6858 * [Make crates-io registry URL optional in config; ignore all changes to
6859 source.crates-io][cargo/3089]
6860 * [Don't download dependencies from other platforms][cargo/3123]
6861 * [Build transitive dev-dependencies when needed][cargo/3125]
6862 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6863 * [Avoid updating registry when adding existing deps][cargo/3144]
6864 * [Warn about path overrides that won't work][cargo/3136]
6865 * [Use workspaces during `cargo install`][cargo/3146]
6866 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6867 * [Add --message-format flag][cargo/3000]
6868 * [Pass target environment for rustdoc][cargo/3205]
6869 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6870 * [Update curl and curl-sys][cargo/3241]
6871 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6876 * [rustdoc: Add the `--sysroot` argument][36586]
6877 * [rustdoc: Fix a couple of issues with the search results][35655]
6878 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6879 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6880 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6885 * [Remove unmaintained style guide][35124]
6886 * [Add s390x support][36369]
6887 * [Initial work at Haiku OS support][36727]
6888 * [Add mips-uclibc targets][35734]
6889 * [Crate-ify compiler-rt into compiler-builtins][35021]
6890 * [Add rustc version info (git hash + date) to dist tarball][36213]
6891 * Many documentation improvements
6896 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6897 * [Deny (by default) transmuting from fn item types to pointer-sized
6898 types][34923]. Continuing the long transition to zero-sized fn items,
6900 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6902 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6903 * [Fix lifetime rules for 'if' conditions][36029].
6904 * [Inherit overflow checks for sum and product][36372].
6905 * [Forbid user-defined macros named "macro_rules"][36730].
6907 [33922]: https://github.com/rust-lang/rust/pull/33922
6908 [34623]: https://github.com/rust-lang/rust/pull/34623
6909 [34923]: https://github.com/rust-lang/rust/pull/34923
6910 [34942]: https://github.com/rust-lang/rust/pull/34942
6911 [35021]: https://github.com/rust-lang/rust/pull/35021
6912 [35048]: https://github.com/rust-lang/rust/pull/35048
6913 [35074]: https://github.com/rust-lang/rust/pull/35074
6914 [35124]: https://github.com/rust-lang/rust/pull/35124
6915 [35234]: https://github.com/rust-lang/rust/pull/35234
6916 [35238]: https://github.com/rust-lang/rust/pull/35238
6917 [35354]: https://github.com/rust-lang/rust/pull/35354
6918 [35559]: https://github.com/rust-lang/rust/pull/35559
6919 [35585]: https://github.com/rust-lang/rust/pull/35585
6920 [35627]: https://github.com/rust-lang/rust/pull/35627
6921 [35655]: https://github.com/rust-lang/rust/pull/35655
6922 [35702]: https://github.com/rust-lang/rust/pull/35702
6923 [35707]: https://github.com/rust-lang/rust/pull/35707
6924 [35728]: https://github.com/rust-lang/rust/pull/35728
6925 [35734]: https://github.com/rust-lang/rust/pull/35734
6926 [35755]: https://github.com/rust-lang/rust/pull/35755
6927 [35761]: https://github.com/rust-lang/rust/pull/35761
6928 [35764]: https://github.com/rust-lang/rust/pull/35764
6929 [35814]: https://github.com/rust-lang/rust/pull/35814
6930 [35854]: https://github.com/rust-lang/rust/pull/35854
6931 [35871]: https://github.com/rust-lang/rust/pull/35871
6932 [35884]: https://github.com/rust-lang/rust/pull/35884
6933 [35911]: https://github.com/rust-lang/rust/pull/35911
6934 [35969]: https://github.com/rust-lang/rust/pull/35969
6935 [35975]: https://github.com/rust-lang/rust/pull/35975
6936 [36004]: https://github.com/rust-lang/rust/pull/36004
6937 [36008]: https://github.com/rust-lang/rust/pull/36008
6938 [36014]: https://github.com/rust-lang/rust/pull/36014
6939 [36029]: https://github.com/rust-lang/rust/pull/36029
6940 [36059]: https://github.com/rust-lang/rust/pull/36059
6941 [36072]: https://github.com/rust-lang/rust/pull/36072
6942 [36101]: https://github.com/rust-lang/rust/pull/36101
6943 [36104]: https://github.com/rust-lang/rust/pull/36104
6944 [36171]: https://github.com/rust-lang/rust/pull/36171
6945 [36173]: https://github.com/rust-lang/rust/pull/36173
6946 [36178]: https://github.com/rust-lang/rust/pull/36178
6947 [36213]: https://github.com/rust-lang/rust/pull/36213
6948 [36214]: https://github.com/rust-lang/rust/pull/36214
6949 [36264]: https://github.com/rust-lang/rust/pull/36264
6950 [36266]: https://github.com/rust-lang/rust/pull/36266
6951 [36289]: https://github.com/rust-lang/rust/pull/36289
6952 [36338]: https://github.com/rust-lang/rust/pull/36338
6953 [36351]: https://github.com/rust-lang/rust/pull/36351
6954 [36355]: https://github.com/rust-lang/rust/pull/36355
6955 [36369]: https://github.com/rust-lang/rust/pull/36369
6956 [36372]: https://github.com/rust-lang/rust/pull/36372
6957 [36423]: https://github.com/rust-lang/rust/pull/36423
6958 [36482]: https://github.com/rust-lang/rust/pull/36482
6959 [36505]: https://github.com/rust-lang/rust/pull/36505
6960 [36524]: https://github.com/rust-lang/rust/pull/36524
6961 [36527]: https://github.com/rust-lang/rust/pull/36527
6962 [36551]: https://github.com/rust-lang/rust/pull/36551
6963 [36574]: https://github.com/rust-lang/rust/pull/36574
6964 [36586]: https://github.com/rust-lang/rust/pull/36586
6965 [36592]: https://github.com/rust-lang/rust/pull/36592
6966 [36631]: https://github.com/rust-lang/rust/pull/36631
6967 [36721]: https://github.com/rust-lang/rust/pull/36721
6968 [36727]: https://github.com/rust-lang/rust/pull/36727
6969 [36730]: https://github.com/rust-lang/rust/pull/36730
6970 [36734]: https://github.com/rust-lang/rust/pull/36734
6971 [36754]: https://github.com/rust-lang/rust/pull/36754
6972 [36995]: https://github.com/rust-lang/rust/pull/36995
6973 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6974 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6975 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6976 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6977 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6978 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6979 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6980 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6981 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6982 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6983 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6984 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6985 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6986 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6987 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6988 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6989 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6990 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6991 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6992 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6993 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6994 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6995 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6996 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6997 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6998 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6999 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7000 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7001 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7002 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7003 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7004 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7007 Version 1.12.1 (2016-10-20)
7008 ===========================
7013 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7014 * [Confusion with double negation and booleans][36856]
7015 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7016 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7017 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7018 * [Corrupted memory after updated to 1.12][36936]
7019 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7020 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7021 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7023 [36381]: https://github.com/rust-lang/rust/issues/36381
7024 [36856]: https://github.com/rust-lang/rust/issues/36856
7025 [36875]: https://github.com/rust-lang/rust/issues/36875
7026 [36924]: https://github.com/rust-lang/rust/issues/36924
7027 [36926]: https://github.com/rust-lang/rust/issues/36926
7028 [36936]: https://github.com/rust-lang/rust/issues/36936
7029 [37026]: https://github.com/rust-lang/rust/issues/37026
7030 [37112]: https://github.com/rust-lang/rust/issues/37112
7031 [37153]: https://github.com/rust-lang/rust/issues/37153
7034 Version 1.12.0 (2016-09-29)
7035 ===========================
7040 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7041 This translation pass is far simpler than the previous AST->LLVM pass, and
7042 creates opportunities to perform new optimizations directly on the MIR. It
7043 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7044 * [`rustc` presents a new, more readable error format, along with
7045 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7046 Most common editors supporting Rust have been updated to work with it. It was
7047 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7052 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7053 This translation pass is far simpler than the previous AST->LLVM pass, and
7054 creates opportunities to perform new optimizations directly on the MIR. It
7055 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7056 * [Print the Rust target name, not the LLVM target name, with
7057 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7058 * [The computation of `TypeId` is correct in some cases where it was previously
7059 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7060 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7061 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7062 `--print relocation-models`, and `--print code-models` print the available
7063 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7064 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7065 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7066 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7067 These targets produce statically-linked binaries. There are no binary release
7073 * [`rustc` presents a new, more readable error format, along with
7074 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7075 Most common editors supporting Rust have been updated to work with it. It was
7076 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7077 * [In error descriptions, references are now described in plain English,
7078 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7079 * [In error type descriptions, unknown numeric types are named `{integer}` or
7080 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7081 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7086 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7087 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7088 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7089 useful](https://github.com/rust-lang/rust/pull/34908)
7090 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7091 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7092 * [Semicolons are properly required as statement delimiters inside
7093 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7094 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7099 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7100 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7101 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7102 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7103 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7104 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7105 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7106 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7107 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7108 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7109 Both on Unix and Windows.
7110 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7111 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7112 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7113 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7114 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7115 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7116 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7117 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7122 * [The `format!` macro and friends now allow a single argument to be formatted
7123 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7124 * [The lifetime bounds on `[T]::binary_search_by` and
7125 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7126 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7127 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7128 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7129 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7130 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7131 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7132 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7133 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7134 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7135 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7136 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7137 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7138 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7139 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7140 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7141 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7142 * [`mpsc::sync_channel` `Receiver`s return any available message before
7143 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7144 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7145 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7150 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7151 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7152 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7153 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7154 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7155 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7156 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7157 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7158 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7159 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7160 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7161 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7162 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7163 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7164 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7165 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7170 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7171 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7176 * [Test binaries now support a `--test-threads` argument to specify the number
7177 of threads used to run tests, and which acts the same as the
7178 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7179 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7180 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7181 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7182 * [Rust releases now come with source packages that can be installed by rustup
7183 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7184 The resulting source code can be used by tools and IDES, located in the
7185 sysroot under `lib/rustlib/src`.
7190 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7191 * Many minor improvements to the documentation.
7192 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7197 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7198 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7199 * [When formatting strings, if "precision" is specified, the "fill",
7200 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7201 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7204 Version 1.11.0 (2016-08-18)
7205 ===========================
7210 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7211 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7212 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7213 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7218 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7219 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7220 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7221 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7222 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7223 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7224 (in libcore - previously stabilized in libstd)
7225 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7226 (in libcore - previously stabilized in libstd)
7227 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7228 (in libcore - previously stabilized in libstd)
7229 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7230 (in libcore - previously stabilized in libstd)
7231 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7232 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7233 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7234 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7239 * [The `thread_local!` macro supports multiple definitions in a single
7240 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7241 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7242 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7243 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7244 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7245 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7246 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7247 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7252 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7253 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7254 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7255 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7256 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7257 and `-vv` prints warnings for all crates.
7258 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7259 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7260 This provides room for expansion by arbitrary tools.
7261 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7262 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7263 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7264 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7265 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7266 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7267 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7272 * [Caching projections speeds up type check dramatically for some
7273 workloads](https://github.com/rust-lang/rust/pull/33816)
7274 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7275 This hasher is faster, but is believed to provide sufficient
7276 protection from collision attacks.
7277 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7282 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7283 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7284 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7285 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7286 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7291 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7292 * [When emitting debug info, rustc emits frame pointers for closures,
7293 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7294 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7295 * Many more errors have been given error codes and extended
7297 * API documentation continues to be improved, with many new examples
7302 * [rustc no longer hangs when dependencies recursively re-export
7303 submodules](https://github.com/rust-lang/rust/pull/34542)
7304 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7305 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7306 rewritten](https://github.com/rust-lang/rust/pull/33895)
7307 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7308 No targets use this yet, but it works toward AVR support.
7313 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7314 * [The new follow-set rules that place restrictions on `macro_rules!`
7315 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7316 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7317 and has been a warning since 1.10.
7318 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7319 This causes breakage in some corner cases.
7322 Version 1.10.0 (2016-07-07)
7323 ===========================
7328 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7329 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7330 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7331 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7332 * [`panic!` can be converted to a runtime abort with the
7333 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7334 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7335 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7336 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7337 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7338 Note that Cargo does not yet directly support cdylibs.
7343 * `os::windows::fs::OpenOptionsExt::access_mode`
7344 * `os::windows::fs::OpenOptionsExt::share_mode`
7345 * `os::windows::fs::OpenOptionsExt::custom_flags`
7346 * `os::windows::fs::OpenOptionsExt::attributes`
7347 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7348 * `os::unix::fs::OpenOptionsExt::custom_flags`
7349 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7350 * `Default for sync::Weak`
7351 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7352 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7353 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7354 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7355 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7356 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7357 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7358 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7359 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7360 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7361 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7362 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7363 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7364 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7365 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7366 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7367 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7368 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7369 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7370 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7371 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7372 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7373 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7374 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7375 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7376 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7377 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7378 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7379 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7380 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7381 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7382 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7383 * Read/Write/RawFd impls for `UnixStream`
7384 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7385 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7386 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7387 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7388 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7389 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7390 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7391 * RawFd impls for `UnixListener`
7392 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7393 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7394 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7395 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7396 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7397 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7398 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7399 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7400 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7401 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7402 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7403 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7404 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7405 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7406 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7407 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7408 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7409 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7410 * RawFd impls for `UnixDatagram`
7411 * `{BTree,Hash}Map::values_mut`
7412 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7417 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7418 The semantics of this minor method are subtle and probably not what
7420 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7421 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7422 will fall back to `/dev/urandom` temporarily to avoid blocking
7423 during early boot](https://github.com/rust-lang/rust/pull/33086).
7424 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7425 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7426 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7427 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7428 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7429 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7430 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7434 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7435 This controls the runtime behavior of the `panic!` macro
7436 and can be either "unwind" (the default), or "abort".
7437 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7438 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7439 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7440 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7441 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7442 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7443 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7444 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7445 By default they are retried twice, which can be customized with the
7446 `net.retry` value in `.cargo/config`.
7447 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7448 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7449 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7450 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7451 Makes it possible to install multiple crates in parallel.
7452 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7453 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7454 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7455 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7456 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7457 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7462 * [rustc memory usage was reduced by refactoring the context used for
7463 type checking](https://github.com/rust-lang/rust/pull/33425).
7464 * [Speed up creation of `HashMap`s by caching the random keys used
7465 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7466 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7467 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7468 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7469 10x faster than the previous lookup tables.
7470 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7475 * Many incremental improvements to documentation and rustdoc.
7476 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7477 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7478 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7479 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7480 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7481 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7482 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7487 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7488 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7489 * [`std` no longer prints backtraces on platforms where the running
7490 module must be loaded with `env::current_exe`, which can't be relied
7491 on](https://github.com/rust-lang/rust/pull/33554).
7492 * This release includes std binaries for the i586-unknown-linux-gnu,
7493 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7494 i586 target is for old x86 hardware without SSE2, and the armv7
7495 target is for Android running on modern ARM architectures.
7496 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7497 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7498 * [On Unix the runtime aborts by calling `libc::abort` instead of
7499 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7500 * [Rust is now bootstrapped from the previous release of Rust,
7501 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7506 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7507 * [`target_env` for Linux ARM targets is just `gnu`, not
7508 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7509 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7510 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7511 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7512 Affects how macros are parsed.
7513 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7514 * [Feature-gated attributes on macro-generated macro invocations are
7515 now rejected](https://github.com/rust-lang/rust/pull/32791).
7516 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7517 This caused some minor changes to type inference.
7520 Version 1.9.0 (2016-05-26)
7521 ==========================
7526 * The `#[deprecated]` attribute when applied to an API will generate
7527 warnings when used. The warnings may be suppressed with
7528 `#[allow(deprecated)]`. [RFC 1270].
7529 * [`fn` item types are zero sized, and each `fn` names a unique
7530 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7531 `transmute` on a `fn` type will generate a warning for a few cycles,
7532 then will be converted to an error.
7533 * [Field and method resolution understand visibility, so private
7534 fields and methods cannot prevent the proper use of public fields
7535 and methods][1.9fv].
7536 * [The parser considers unicode codepoints in the
7537 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7543 * [`std::panic::catch_unwind`] (renamed from `recover`)
7544 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7545 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7546 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7547 * [`str::is_char_boundary`]
7548 * [`<*const T>::as_ref`]
7549 * [`<*mut T>::as_ref`]
7550 * [`<*mut T>::as_mut`]
7551 * [`AsciiExt::make_ascii_uppercase`]
7552 * [`AsciiExt::make_ascii_lowercase`]
7553 * [`char::decode_utf16`]
7554 * [`char::DecodeUtf16`]
7555 * [`char::DecodeUtf16Error`]
7556 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7557 * [`BTreeSet::take`]
7558 * [`BTreeSet::replace`]
7561 * [`HashSet::replace`]
7563 * [`OsString::with_capacity`]
7564 * [`OsString::clear`]
7565 * [`OsString::capacity`]
7566 * [`OsString::reserve`]
7567 * [`OsString::reserve_exact`]
7568 * [`OsStr::is_empty`]
7570 * [`std::os::unix::thread`]
7573 * [`JoinHandleExt::as_pthread_t`]
7574 * [`JoinHandleExt::into_pthread_t`]
7575 * [`HashSet::hasher`]
7576 * [`HashMap::hasher`]
7577 * [`CommandExt::exec`]
7578 * [`File::try_clone`]
7579 * [`SocketAddr::set_ip`]
7580 * [`SocketAddr::set_port`]
7581 * [`SocketAddrV4::set_ip`]
7582 * [`SocketAddrV4::set_port`]
7583 * [`SocketAddrV6::set_ip`]
7584 * [`SocketAddrV6::set_port`]
7585 * [`SocketAddrV6::set_flowinfo`]
7586 * [`SocketAddrV6::set_scope_id`]
7587 * [`slice::copy_from_slice`]
7588 * [`ptr::read_volatile`]
7589 * [`ptr::write_volatile`]
7590 * [`OpenOptions::create_new`]
7591 * [`TcpStream::set_nodelay`]
7592 * [`TcpStream::nodelay`]
7593 * [`TcpStream::set_ttl`]
7594 * [`TcpStream::ttl`]
7595 * [`TcpStream::set_only_v6`]
7596 * [`TcpStream::only_v6`]
7597 * [`TcpStream::take_error`]
7598 * [`TcpStream::set_nonblocking`]
7599 * [`TcpListener::set_ttl`]
7600 * [`TcpListener::ttl`]
7601 * [`TcpListener::set_only_v6`]
7602 * [`TcpListener::only_v6`]
7603 * [`TcpListener::take_error`]
7604 * [`TcpListener::set_nonblocking`]
7605 * [`UdpSocket::set_broadcast`]
7606 * [`UdpSocket::broadcast`]
7607 * [`UdpSocket::set_multicast_loop_v4`]
7608 * [`UdpSocket::multicast_loop_v4`]
7609 * [`UdpSocket::set_multicast_ttl_v4`]
7610 * [`UdpSocket::multicast_ttl_v4`]
7611 * [`UdpSocket::set_multicast_loop_v6`]
7612 * [`UdpSocket::multicast_loop_v6`]
7613 * [`UdpSocket::set_multicast_ttl_v6`]
7614 * [`UdpSocket::multicast_ttl_v6`]
7615 * [`UdpSocket::set_ttl`]
7616 * [`UdpSocket::ttl`]
7617 * [`UdpSocket::set_only_v6`]
7618 * [`UdpSocket::only_v6`]
7619 * [`UdpSocket::join_multicast_v4`]
7620 * [`UdpSocket::join_multicast_v6`]
7621 * [`UdpSocket::leave_multicast_v4`]
7622 * [`UdpSocket::leave_multicast_v6`]
7623 * [`UdpSocket::take_error`]
7624 * [`UdpSocket::connect`]
7625 * [`UdpSocket::send`]
7626 * [`UdpSocket::recv`]
7627 * [`UdpSocket::set_nonblocking`]
7632 * [`std::sync::Once` is poisoned if its initialization function
7634 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7635 * [Most types implement `fmt::Debug`][1.9db].
7636 * [The default buffer size used by `BufReader` and `BufWriter` was
7637 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7638 used by other languages.
7639 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7640 `Duration` additionally implements `*=` and `/=`][1.9ta].
7641 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7642 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7643 * [`Chain` implements `BufRead`][1.9ch].
7644 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7649 * [Cargo can now run concurrently][1.9cc].
7650 * [Top-level overrides allow specific revisions of crates to be
7651 overridden through the entire crate graph][1.9ct]. This is intended
7652 to make upgrades easier for large projects, by allowing crates to be
7653 forked temporarily until they've been upgraded and republished.
7654 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7655 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7656 on the commandline][1.9cf]. `rustc` arguments can also be specified
7657 in the `build.rustflags` configuration key.
7662 * [The time complexity of comparing variables for equivalence during type
7663 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7664 to major compilation time improvement in some scenarios.
7665 * [`ToString` is specialized for `str`, giving it the same performance
7666 as `to_owned`][1.9ts].
7667 * [Spawning processes with `Command::output` no longer creates extra
7669 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7670 for C-like enums][1.9cl].
7675 * [Passing the `--quiet` flag to a test runner will produce
7676 much-abbreviated output][1.9q].
7677 * The Rust Project now publishes std binaries for the
7678 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7679 `i586-pc-windows-msvc` targets.
7684 * [`std::sync::Once` is poisoned if its initialization function
7686 * [It is illegal to define methods with the same name in overlapping
7687 inherent `impl` blocks][1.9sn].
7688 * [`fn` item types are zero sized, and each `fn` names a unique
7689 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7690 `transmute` on a `fn` type will generate a warning for a few cycles,
7691 then will be converted to an error.
7692 * [Improvements to const evaluation may trigger new errors when integer
7693 literals are out of range][1.9ce].
7696 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7697 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7698 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7699 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7700 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7701 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7702 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7703 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7704 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7705 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7706 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7707 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7708 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7709 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7710 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7711 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7712 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7713 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7714 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7715 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7716 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7717 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7718 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7719 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7720 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7721 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7722 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7723 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7724 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7725 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7726 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7727 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7728 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7729 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7730 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7731 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7732 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7733 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7734 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7735 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7736 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7737 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7738 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7739 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7740 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7741 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7742 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7743 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7744 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7745 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7746 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7747 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7748 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7749 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7750 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7751 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7752 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7753 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7754 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7755 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7756 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7757 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7758 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7759 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7760 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7761 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7762 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7763 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7764 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7765 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7766 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7767 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7768 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7769 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7770 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7771 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7772 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7773 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7774 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7775 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7776 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7777 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7778 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7779 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7780 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7781 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7782 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7783 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7784 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7785 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7786 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7787 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7788 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7789 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7790 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7791 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7792 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7793 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7794 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7795 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7796 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7797 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7798 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7799 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7800 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7801 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7802 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7803 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7804 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7805 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7808 Version 1.8.0 (2016-04-14)
7809 ==========================
7814 * Rust supports overloading of compound assignment statements like
7815 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7816 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7817 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7819 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7820 addition to the non-braced form, `struct Foo;`. [RFC 218].
7826 * [`str::encode_utf16`] (renamed from `utf16_units`)
7827 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7830 * [`ptr::drop_in_place`]
7832 * [`time::SystemTime`]
7834 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7835 * [`Instant::elapsed`]
7836 * [`SystemTime::now`]
7837 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7838 * [`SystemTime::elapsed`]
7839 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7840 * [`SystemTimeError`]
7841 * [`SystemTimeError::duration`]
7842 * Various impls for `SystemTimeError`
7844 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7845 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7846 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7847 * [The `write!` and `writeln!` macros correctly emit errors if any of
7848 their arguments can't be formatted][1.8w].
7849 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7850 * [The Unix-specific `raw` modules, which contain a number of
7851 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7852 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7853 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7854 across platforms was making it difficult to implement `std`
7855 correctly. Those that need these definitions should use the `libc`
7857 * The Unix-specific `MetadataExt` traits, including
7858 `os::unix::fs::MetadataExt`, which expose values such as inode
7859 numbers [no longer return platform-specific types][1.8r], but
7860 instead return widened integers. [RFC 1415].
7861 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7862 * [Atomic loads and stores are not volatile][1.8a].
7863 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7868 * [Inlining hash functions lead to a 3% compile-time improvement in
7869 some workloads][1.8h].
7870 * When using jemalloc, its symbols are [unprefixed so that it
7871 overrides the libc malloc implementation][1.8h]. This means that for
7872 rustc, LLVM is now using jemalloc, which results in a 6%
7873 compile-time improvement on a specific workload.
7874 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7879 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7880 i686-pc-windows-msvc is now considered a tier-1 platform.
7881 * [The `--print targets` flag prints a list of supported targets][1.8t].
7882 * [The `--print cfg` flag prints the `cfg`s defined for the current
7884 * [`rustc` can be built with an new Cargo-based build system, written
7885 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7886 build system. To enable it configure with `configure --rustbuild`.
7887 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7888 variants while also indicating the total number of missing variants
7889 if more than 3][1.8m].
7890 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7891 * The Rust Project now publishes binary releases of the standard
7892 library for a number of tier-2 targets:
7893 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7894 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7895 `x86_64-rumprun-netbsd`. These can be installed with
7896 tools such as [multirust][1.8mr].
7901 * [`cargo init` creates a new Cargo project in the current
7902 directory][1.8ci]. It is otherwise like `cargo new`.
7903 * [Cargo has configuration keys for `-v` and
7904 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7905 `[term]` section of `.cargo/config`.
7906 * [Configuration keys that evaluate to strings or integers can be set
7907 via environment variables][1.8ce]. For example the `build.jobs` key
7908 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7909 precedence over config files.
7910 * [Target-specific dependencies support Rust `cfg` syntax for
7911 describing targets][1.8cfg] so that dependencies for multiple
7912 targets can be specified together. [RFC 1361].
7913 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7914 `RUSTDOC` take precedence over the `build.target-dir`,
7915 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
7916 * [The child process tree is killed on Windows when Cargo is
7918 * [The `build.target` configuration value sets the target platform,
7919 like `--target`][1.8ct].
7924 * [Unstable compiler flags have been further restricted][1.8u]. Since
7925 1.0 `-Z` flags have been considered unstable, and other flags that
7926 were considered unstable additionally required passing `-Z
7927 unstable-options` to access. Unlike unstable language and library
7928 features though, these options have been accessible on the stable
7929 release channel. Going forward, *new unstable flags will not be
7930 available on the stable release channel*, and old unstable flags
7931 will warn about their usage. In the future, all unstable flags will
7932 be unavailable on the stable release channel.
7933 * [It is no longer possible to `match` on empty enum variants using
7934 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7935 * The Unix-specific `MetadataExt` traits, including
7936 `os::unix::fs::MetadataExt`, which expose values such as inode
7937 numbers [no longer return platform-specific types][1.8r], but
7938 instead return widened integers. [RFC 1415].
7939 * [Modules sourced from the filesystem cannot appear within arbitrary
7940 blocks, but only within other modules][1.8mf].
7941 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7942 * On Unix, [stack overflow triggers a runtime abort instead of a
7944 * [`Command::spawn` and its equivalents return an error if any of
7945 its command-line arguments contain interior `NUL`s][1.8n].
7946 * [Tuple and unit enum variants from other crates are in the type
7948 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7949 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7950 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7951 instead of `foo.lib`.
7954 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7955 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7956 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7957 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7958 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7959 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7960 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7961 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7962 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7963 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7964 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7965 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
7966 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7967 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7968 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7969 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7970 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7971 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7972 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7973 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7974 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7975 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7976 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7977 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7978 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7979 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7980 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7981 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7982 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7983 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7984 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7985 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7986 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7987 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7988 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7989 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7990 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7991 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7992 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7993 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7994 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7995 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7996 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7997 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7998 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7999 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8000 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8001 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8002 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8003 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8004 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8005 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8006 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8007 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8008 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8009 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8010 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8011 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8012 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8013 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8016 Version 1.7.0 (2016-03-03)
8017 ==========================
8024 * [`Path::strip_prefix`] (renamed from relative_from)
8025 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8027 * [`Ipv4Addr::is_loopback`]
8028 * [`Ipv4Addr::is_private`]
8029 * [`Ipv4Addr::is_link_local`]
8030 * [`Ipv4Addr::is_multicast`]
8031 * [`Ipv4Addr::is_broadcast`]
8032 * [`Ipv4Addr::is_documentation`]
8034 * [`Ipv6Addr::is_unspecified`]
8035 * [`Ipv6Addr::is_loopback`]
8036 * [`Ipv6Addr::is_multicast`]
8039 * [`Vec::as_mut_slice`]
8041 * [`String::as_str`]
8042 * [`String::as_mut_str`]
8044 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8046 * `<[T]>::`[`sort_by_key`]
8047 * checked, saturated, and overflowing operations
8048 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8049 * [`i32::saturating_mul`]
8050 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8051 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8052 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8053 * [`u32::saturating_mul`]
8054 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8055 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8056 * and checked, saturated, and overflowing operations for other primitive types
8058 * [`ffi::IntoStringError`]
8059 * [`CString::into_string`]
8060 * [`CString::into_bytes`]
8061 * [`CString::into_bytes_with_nul`]
8062 * `From<CString> for Vec<u8>`
8064 * [`IntoStringError::into_cstring`]
8065 * [`IntoStringError::utf8_error`]
8066 * `Error for IntoStringError`
8068 * [`std::hash::BuildHasher`]
8069 * [`BuildHasher::Hasher`]
8070 * [`BuildHasher::build_hasher`]
8071 * [`std::hash::BuildHasherDefault`]
8072 * [`HashMap::with_hasher`]
8073 * [`HashMap::with_capacity_and_hasher`]
8074 * [`HashSet::with_hasher`]
8075 * [`HashSet::with_capacity_and_hasher`]
8076 * [`std::collections::hash_map::RandomState`]
8077 * [`RandomState::new`]
8078 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8079 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8080 from bytes is faster.
8081 * [The performance of `LineWriter` (and thus `io::stdout`) was
8082 improved by using `memchr` to search for newlines][1.7m].
8083 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8084 `f64` variants were stabilized previously.
8085 * [`BTreeMap` was rewritten to use less memory and improve the performance
8086 of insertion and iteration, the latter by as much as 5x][1.7bm].
8087 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8088 covariant over their contained type][1.7bt].
8089 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8090 over their contained type][1.7ll].
8091 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8093 * [`Any` is implemented for unsized types][1.7a].
8094 * [`Hash` is implemented for `Duration`][1.7h].
8099 * [When running tests with `--test`, rustdoc will pass `--cfg`
8100 arguments to the compiler][1.7dt].
8101 * [The compiler is built with RPATH information by default][1.7rpa].
8102 This means that it will be possible to run `rustc` when installed in
8103 unusual configurations without configuring the dynamic linker search
8105 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8106 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8107 over `LD_LIBRARY_PATH`.
8112 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8113 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8114 * [The `rerun-if-changed` build script directive no longer causes the
8115 build script to incorrectly run twice in certain scenarios][1.7rr].
8120 * Soundness fixes to the interactions between associated types and
8121 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8122 code that violates the new rules. This is a significant change that
8123 is known to break existing code, so it has emitted warnings for the
8124 new error cases since 1.4 to give crate authors time to adapt. The
8125 details of what is changing are subtle; read the RFC for more.
8126 * [Several bugs in the compiler's visibility calculations were
8127 fixed][1.7v]. Since this was found to break significant amounts of
8128 code, the new errors will be emitted as warnings for several release
8129 cycles, under the `private_in_public` lint.
8130 * Defaulted type parameters were accidentally accepted in positions
8131 that were not intended. In this release, [defaulted type parameters
8132 appearing outside of type definitions will generate a
8133 warning][1.7d], which will become an error in future releases.
8134 * [Parsing "." as a float results in an error instead of 0][1.7p].
8135 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8136 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8138 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8139 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8140 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8141 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8142 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8143 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8144 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8145 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8146 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8147 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8148 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8149 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8150 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8151 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8152 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8153 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8154 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8155 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8156 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8157 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8158 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8159 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8160 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8161 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8162 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8163 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8164 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8165 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8166 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8167 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8168 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8169 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8170 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8171 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8172 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8173 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8174 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8175 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8176 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8177 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8178 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8179 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8180 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8181 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8182 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8183 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8184 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8185 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8186 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8187 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8188 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8189 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8190 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8191 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8192 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8193 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8194 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8195 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8196 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8197 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8198 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8199 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8200 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8201 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8202 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8203 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8204 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8205 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8206 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8207 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8208 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8209 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8210 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8211 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8212 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8213 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8214 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8215 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8216 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8219 Version 1.6.0 (2016-01-21)
8220 ==========================
8225 * The `#![no_std]` attribute causes a crate to not be linked to the
8226 standard library, but only the [core library][1.6co], as described
8227 in [RFC 1184]. The core library defines common types and traits but
8228 has no platform dependencies whatsoever, and is the basis for Rust
8229 software in environments that cannot support a full port of the
8230 standard library, such as operating systems. Most of the core
8231 library is now stable.
8237 [`Read::read_exact`],
8238 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8239 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8240 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8241 [`os::unix::fs::DirBuilderExt`],
8242 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8243 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8244 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8245 [`collections::hash_map::Drain`],
8246 [`collections::hash_map::HashMap::drain`],
8247 [`collections::hash_set::Drain`],
8248 [`collections::hash_set::HashSet::drain`],
8249 [`collections::binary_heap::Drain`],
8250 [`collections::binary_heap::BinaryHeap::drain`],
8251 [`Vec::extend_from_slice`] (renamed from `push_all`),
8252 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8253 [`RwLock::into_inner`],
8254 [`Iterator::min_by_key`] (renamed from `min_by`),
8255 [`Iterator::max_by_key`] (renamed from `max_by`).
8256 * The [core library][1.6co] is stable, as are most of its APIs.
8257 * [The `assert_eq!` macro supports arguments that don't implement
8258 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8260 * Several timer functions that take duration in milliseconds [are
8261 deprecated in favor of those that take `Duration`][1.6ms]. These
8262 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8263 `thread::park_timeout_ms`.
8264 * The algorithm by which `Vec` reserves additional elements was
8265 [tweaked to not allocate excessive space][1.6a] while still growing
8267 * `From` conversions are [implemented from integers to floats][1.6f]
8268 in cases where the conversion is lossless. Thus they are not
8269 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8270 or `f64`. They are also not implemented for `isize` and `usize`
8271 because the implementations would be platform-specific. `From` is
8272 also implemented from `f32` to `f64`.
8273 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8274 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8275 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8276 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8278 * Sorting slices that are already sorted [is 50% faster in some
8284 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8285 * Cargo build scripts can specify their dependencies by emitting the
8286 [`rerun-if-changed`][1.6rr] key.
8287 * crates.io will reject publication of crates with dependencies that
8288 have a wildcard version constraint. Crates with wildcard
8289 dependencies were seen to cause a variety of problems, as described
8290 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8292 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8293 release folder. A variety of artifacts that Cargo failed to clean
8294 are now correctly deleted.
8299 * The `unreachable_code` lint [warns when a function call's argument
8301 * The parser indicates [failures that may be caused by
8302 confusingly-similar Unicode characters][1.6uc]
8303 * Certain macro errors [are reported at definition time][1.6m], not
8309 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8310 environment variable when locating crates. This was a pre-cargo
8311 feature for integrating with the package manager that was
8312 accidentally never removed.
8313 * [A number of bugs were fixed in the privacy checker][1.6p] that
8314 could cause previously-accepted code to break.
8315 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8316 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8317 struct pattern syntax (`Foo(..)`) can no longer be used to match
8318 unit structs. This is a warning now, but will become an error in
8319 future releases. Patterns that share the same name as a const are
8321 * A bug was fixed that causes [rustc not to apply default type
8322 parameters][1.6xc] when resolving certain method implementations of
8323 traits defined in other crates.
8325 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8326 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8327 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8328 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8329 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8330 [1.6co]: http://doc.rust-lang.org/core/index.html
8331 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8332 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8333 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8334 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8335 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8336 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8337 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8338 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8339 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8340 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8341 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8342 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8343 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8344 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8345 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8346 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8347 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8348 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8349 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8350 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8351 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8352 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8353 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8354 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8355 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8356 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8357 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8358 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8359 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8360 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8361 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8362 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8363 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8364 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8365 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8366 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8367 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8368 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8369 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8370 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8371 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8374 Version 1.5.0 (2015-12-10)
8375 ==========================
8377 * ~700 changes, numerous bugfixes
8383 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8384 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8385 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8386 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8387 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8388 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8389 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8390 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8391 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8392 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8393 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8394 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8395 [`Path::read_link`], [`Path::symlink_metadata`],
8396 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8397 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8398 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8399 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8400 [`slice::split_first_mut`], [`slice::split_first`],
8401 [`slice::split_last_mut`], [`slice::split_last`],
8402 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8403 [`str::MatchIndices`], [`str::RMatchIndices`],
8404 [`str::match_indices`], [`str::rmatch_indices`],
8405 [`str::slice_mut_unchecked`], [`string::ParseError`].
8406 * Rust applications hosted on crates.io can be installed locally to
8407 `~/.cargo/bin` with the [`cargo install`] command. Among other
8408 things this makes it easier to augment Cargo with new subcommands:
8409 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8410 invoked as `cargo foo`.
8411 * Crates with wildcard (`*`) dependencies will [emit warnings when
8412 published][1.5w]. In 1.6 it will no longer be possible to publish
8413 crates with wildcard dependencies.
8418 * The rules determining when a particular lifetime must outlive
8419 a particular value (known as '[dropck]') have been [modified
8420 to not rely on parametricity][1.5p].
8421 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8422 and `Arc`][1.5a]. Because these smart pointer types implement
8423 `Deref`, this causes breakage in cases where the interior type
8424 contains methods of the same name.
8425 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8426 that they could drop their content. Soundness fix.
8427 * All method invocations are [properly checked][1.5wf1] for
8428 [well-formedness][1.5wf2]. Soundness fix.
8429 * Traits whose supertraits contain `Self` are [not object
8430 safe][1.5o]. Soundness fix.
8431 * Target specifications support a [`no_default_libraries`][1.5nd]
8432 setting that controls whether `-nodefaultlibs` is passed to the
8433 linker, and in turn the `is_like_windows` setting no longer affects
8434 the `-nodefaultlibs` flag.
8435 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8436 * The `#[inline]` and `#[repr]` attributes [can only appear
8437 in valid locations][1.5at].
8438 * Native libraries linked from the local crate are [passed to
8439 the linker before native libraries from upstream crates][1.5nl].
8440 * Two rarely-used attributes, `#[no_debug]` and
8441 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8442 * Negation of unsigned integers, which has been a warning for
8443 several releases, [is now behind a feature gate and will
8444 generate errors][1.5nu].
8445 * The parser accidentally accepted visibility modifiers on
8446 enum variants, a bug [which has been fixed][1.5ev].
8447 * [A bug was fixed that allowed `use` statements to import unstable
8453 * When evaluating expressions at compile-time that are not
8454 compile-time constants (const-evaluating expressions in non-const
8455 contexts), incorrect code such as overlong bitshifts and arithmetic
8456 overflow will [generate a warning instead of an error][1.5ce],
8457 delaying the error until runtime. This will allow the
8458 const-evaluator to be expanded in the future backwards-compatibly.
8459 * The `improper_ctypes` lint [no longer warns about using `isize` and
8460 `usize` in FFI][1.5ict].
8465 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8467 * `Default` is [implemented for mutable slices][1.5d].
8468 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8469 * There are now `From` conversions [between floating point
8470 types][1.5f] where the conversions are lossless.
8471 * There are now `From` conversions [between integer types][1.5i] where
8472 the conversions are lossless.
8473 * [`fs::Metadata` implements `Clone`][1.5fs].
8474 * The `parse` method [accepts a leading "+" when parsing
8476 * [`AsMut` is implemented for `Vec`][1.5am].
8477 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8478 been optimized][1.5cf] and no longer rely on the default impl.
8479 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8480 `unsafe extern "C"` function types now [implement `Clone`,
8481 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8482 `fmt::Debug` for up to 12 arguments][1.5fp].
8483 * [Dropping `Vec`s is much faster in unoptimized builds when the
8484 element types don't implement `Drop`][1.5dv].
8485 * A bug that caused in incorrect behavior when [combining `VecDeque`
8486 with zero-sized types][1.5vdz] was resolved.
8487 * [`PartialOrd` for slices is faster][1.5po].
8492 * [Crate metadata size was reduced by 20%][1.5md].
8493 * [Improvements to code generation reduced the size of libcore by 3.3
8494 MB and rustc's memory usage by 18MB][1.5m].
8495 * [Improvements to deref translation increased performance in
8496 unoptimized builds][1.5dr].
8497 * Various errors in trait resolution [are deduplicated to only be
8498 reported once][1.5te].
8499 * Rust has preliminary [support for rumprun kernels][1.5rr].
8500 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8502 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8503 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8504 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8505 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8506 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8507 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8508 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8509 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8510 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8511 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8512 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8513 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8514 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8515 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8516 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8517 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8518 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8519 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8520 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8521 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8522 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8523 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8524 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8525 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8526 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8527 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8528 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8529 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8530 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8531 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8532 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8533 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8534 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8535 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8536 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8537 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8538 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8539 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8540 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8541 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8542 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8543 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8544 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8545 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8546 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8547 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8548 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8549 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8550 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8551 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8552 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8553 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8554 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8555 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8556 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8557 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8558 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8559 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8560 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8561 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8562 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8563 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8564 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8565 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8566 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8567 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8568 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8569 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8570 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8571 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8572 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8573 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8574 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8575 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8576 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8577 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8578 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8579 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8580 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8581 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8582 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8583 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8584 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8585 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8586 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8587 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8588 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8589 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8590 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8592 Version 1.4.0 (2015-10-29)
8593 ==========================
8595 * ~1200 changes, numerous bugfixes
8600 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8601 GNU) are now supported and recommended for use.
8606 * [Several changes have been made to fix type soundness and improve
8607 the behavior of associated types][sound]. See [RFC 1214]. Although
8608 we have mostly introduced these changes as warnings this release, to
8609 become errors next release, there are still some scenarios that will
8610 see immediate breakage.
8611 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8612 line breaks in addition to `\n`][crlf].
8613 * [Loans of `'static` lifetime extend to the end of a function][stat].
8614 * [`str::parse` no longer introduces avoidable rounding error when
8615 parsing floating point numbers. Together with earlier changes to
8616 float formatting/output, "round trips" like f.to_string().parse()
8617 now preserve the value of f exactly. Additionally, leading plus
8618 signs are now accepted][fp3].
8624 * `use` statements that import multiple items [can now rename
8625 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8626 * [Binops work correctly on fat pointers][binfat].
8627 * `pub extern crate`, which does not behave as expected, [issues a
8628 warning][pec] until a better solution is found.
8633 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8634 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8635 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8636 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8637 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8638 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8639 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8640 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8641 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8642 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8643 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8644 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8645 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8646 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8647 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8648 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8649 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8650 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8652 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8653 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8654 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8655 `f64::from_str_radix`.
8656 * [Reverse-searching strings is faster with the 'two-way'
8658 * [`std::io::copy` allows `?Sized` arguments][cc].
8659 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8660 [override `count`, `nth` and `last` with an *O*(1)
8661 implementation][it].
8662 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8663 * [`IntoRawFd` has been added to the Unix-specific prelude,
8664 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8666 * [`Extend<String>` and `FromIterator<String` are both implemented for
8668 * [`IntoIterator` is implemented for references to `Option` and
8670 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8671 Copy`][ext] as part of [RFC 839]. This will cause type inference
8672 breakage in rare situations.
8673 * [`BinaryHeap` implements `Debug`][bh2].
8674 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8676 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8677 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8678 * [String comparison is faster][faststr].
8679 * `&mut T` where `T: std::fmt::Write` [also implements
8680 `std::fmt::Write`][mutw].
8681 * [A stable regression in `VecDeque::push_back` and other
8682 capacity-altering methods that caused panics for zero-sized types
8684 * [Function pointers implement traits for up to 12 parameters][fp2].
8689 * The compiler [no longer uses the 'morestack' feature to prevent
8690 stack overflow][mm]. Instead it uses guard pages and stack
8691 probes (though stack probes are not yet implemented on any platform
8693 * [The compiler matches traits faster when projections are involved][p].
8694 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8696 * [Cargo now displays useful information about what its doing during
8697 `cargo update`][cu].
8699 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8700 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8701 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8702 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8703 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8704 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8705 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8706 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8707 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8708 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8709 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8710 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8711 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8712 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8713 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8714 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8715 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8716 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8717 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8718 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8719 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8720 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8721 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8722 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8723 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8724 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8725 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8726 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8727 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8728 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8729 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8730 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8731 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8732 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8733 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8734 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8735 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8736 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8737 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8738 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8739 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8740 [bh2]: https://github.com/rust-lang/rust/pull/28156
8741 [binfat]: https://github.com/rust-lang/rust/pull/28270
8742 [bm]: https://github.com/rust-lang/rust/pull/28197
8743 [cc]: https://github.com/rust-lang/rust/pull/27531
8744 [crlf]: https://github.com/rust-lang/rust/pull/28034
8745 [cu]: https://github.com/rust-lang/cargo/pull/1931
8746 [d]: https://github.com/rust-lang/rust/pull/27825
8747 [dep]: https://github.com/rust-lang/rust/pull/28339
8748 [es]: https://github.com/rust-lang/rust/pull/27956
8749 [ext]: https://github.com/rust-lang/rust/pull/28094
8750 [faststr]: https://github.com/rust-lang/rust/pull/28338
8751 [ffi]: https://github.com/rust-lang/rust/pull/28779
8752 [fp]: https://github.com/rust-lang/rust/pull/28268
8753 [fp2]: https://github.com/rust-lang/rust/pull/28560
8754 [fp3]: https://github.com/rust-lang/rust/pull/27307
8755 [i]: https://github.com/rust-lang/rust/pull/27451
8756 [into2]: https://github.com/rust-lang/rust/pull/28039
8757 [it]: https://github.com/rust-lang/rust/pull/27652
8758 [mm]: https://github.com/rust-lang/rust/pull/27338
8759 [mutw]: https://github.com/rust-lang/rust/pull/28368
8760 [sound]: https://github.com/rust-lang/rust/pull/27641
8761 [p]: https://github.com/rust-lang/rust/pull/27866
8762 [pec]: https://github.com/rust-lang/rust/pull/28486
8763 [pr]: https://github.com/rust-lang/rust/pull/27896
8764 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8765 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8766 [s]: https://github.com/rust-lang/rust/pull/27474
8767 [stab]: https://github.com/rust-lang/rust/pull/28339
8768 [stat]: https://github.com/rust-lang/rust/pull/28321
8769 [vd]: https://github.com/rust-lang/rust/pull/28494
8771 Version 1.3.0 (2015-09-17)
8772 ==============================
8774 * ~900 changes, numerous bugfixes
8779 * The [new object lifetime defaults][nold] have been [turned
8780 on][nold2] after a cycle of warnings about the change. Now types
8781 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8782 being interpreted as `&'a Box<Trait+'a>` to `&'a
8783 Box<Trait+'static>`.
8784 * [The Rustonomicon][nom] is a new book in the official documentation
8785 that dives into writing unsafe Rust.
8786 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8787 timekeeping is employed by other std APIs, as well as out-of-tree
8793 * The [new object lifetime defaults][nold] have been [turned
8794 on][nold2] after a cycle of warnings about the change.
8795 * There is a known [regression][lr] in how object lifetime elision is
8796 interpreted, the proper solution for which is undetermined.
8797 * The `#[prelude_import]` attribute, an internal implementation
8798 detail, was accidentally stabilized previously. [It has been put
8799 behind the `prelude_import` feature gate][pi]. This change is
8800 believed to break no existing code.
8801 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8802 [more sane for dynamically sized types][dst3]. Code that relied on
8803 the previous behavior is thought to be broken.
8804 * The `dropck` rules, which checks that destructors can't access
8805 destroyed values, [have been updated][dropck] to match the
8806 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8807 cause some previously-compiling code to no longer build.
8812 * The [new object lifetime defaults][nold] have been [turned
8813 on][nold2] after a cycle of warnings about the change.
8814 * Semicolons may [now follow types and paths in
8815 macros](https://github.com/rust-lang/rust/pull/27000).
8816 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8817 [more sane for dynamically sized types][dst3]. Code that relied on
8818 the previous behavior is not known to exist, and suspected to be
8820 * `'static` variables [may now be recursive][st].
8821 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8822 implementations correctly.
8823 * The `dropck` rules, which checks that destructors can't access
8824 destroyed values, [have been updated][dropck] to match the
8830 * The [`Duration`] API, [has been stabilized][ds], as well as the
8831 `std::time` module, which presently contains only `Duration`.
8832 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8833 * The owned C string, [`CString`], implements [`Borrow`] and the
8834 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8835 these allow C strings to be borrowed and cloned in generic code.
8836 * [`CStr`] implements [`Debug`].
8837 * [`AtomicPtr`] implements [`Debug`].
8838 * [`Error`] trait objects [can be downcast to their concrete types][e]
8839 in many common configurations, using the [`is`], [`downcast`],
8840 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8842 * Searching for substrings now [employs the two-way algorithm][search]
8843 instead of doing a naive search. This gives major speedups to a
8844 number of methods, including [`contains`][sc], [`find`][sf],
8845 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8846 [`ends_with`][sew] are also faster.
8847 * The performance of `PartialEq` for slices is [much faster][ps].
8848 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8849 is overridden and optimized by the implementations for scalars.
8850 * The [`Hasher`] trait now has a number of specialized `write_*`
8851 methods for primitive types, for efficiency.
8852 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8853 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8854 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8855 of [`std::error::Error::cause`][iec] also delegates to the inner
8857 * [`process::Child`][pc] gained the [`id`] method, which returns a
8858 `u32` representing the platform-specific process identifier.
8859 * The [`connect`] method on slices is deprecated, replaced by the new
8860 [`join`] method (note that both of these are on the *unstable*
8861 [`SliceConcatExt`] trait, but through the magic of the prelude are
8862 available to stable code anyway).
8863 * The [`Div`] operator is implemented for [`Wrapping`] types.
8864 * [`DerefMut` is implemented for `String`][dms].
8865 * Performance of SipHash (the default hasher for `HashMap`) is
8866 [better for long data][sh].
8867 * [`AtomicPtr`] implements [`Send`].
8868 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8869 are now [specialized to use uninitialized buffers for increased
8871 * Lifetime parameters of foreign functions [are now resolved
8877 * Rust can now, with some coercion, [produce programs that run on
8878 Windows XP][xp], though XP is not considered a supported platform.
8879 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8880 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8881 recommended for use in 1.3, though should be fully-functional
8882 in the [64-bit 1.4 beta][b14].
8883 * On Fedora-based systems installation will [properly configure the
8884 dynamic linker][fl].
8885 * The compiler gained many new extended error descriptions, which can
8886 be accessed with the `--explain` flag.
8887 * The `dropck` pass, which checks that destructors can't access
8888 destroyed values, [has been rewritten][dropck]. This fixes some
8889 soundness holes, and as such will cause some previously-compiling
8890 code to no longer build.
8891 * `rustc` now uses [LLVM to write archive files where possible][ar].
8892 Eventually this will eliminate the compiler's dependency on the ar
8894 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
8895 supported FreeBSD on x86_64).
8896 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8897 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8899 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8900 will kill the process instead of leaking][nlp].
8902 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8903 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8904 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8905 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8906 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8907 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8908 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8909 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8910 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8911 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8912 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8913 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8914 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8915 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8916 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8917 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8918 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8919 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8920 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8921 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8922 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8923 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8924 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8925 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8926 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8927 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8928 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8929 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8930 [ar]: https://github.com/rust-lang/rust/pull/26926
8931 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8932 [dms]: https://github.com/rust-lang/rust/pull/26241
8933 [dropck]: https://github.com/rust-lang/rust/pull/27261
8934 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8935 [ds]: https://github.com/rust-lang/rust/pull/26818
8936 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8937 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8938 [dst3]: https://github.com/rust-lang/rust/pull/27351
8939 [e]: https://github.com/rust-lang/rust/pull/24793
8940 [f]: https://github.com/rust-lang/rust/pull/26588
8941 [fb]: https://github.com/rust-lang/rust/pull/26959
8942 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8943 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8944 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8945 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8946 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8947 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8948 [lic]: https://github.com/rust-lang/rust/pull/26583
8949 [lnu]: https://github.com/rust-lang/rust/pull/27026
8950 [lr]: https://github.com/rust-lang/rust/issues/27248
8951 [lum]: https://github.com/rust-lang/rust/pull/26378
8952 [lur]: https://github.com/rust-lang/rust/pull/26783
8953 [nlp]: https://github.com/rust-lang/rust/pull/27176
8954 [nold2]: https://github.com/rust-lang/rust/pull/27045
8955 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8956 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8957 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8958 [pi]: https://github.com/rust-lang/rust/pull/26699
8959 [ps]: https://github.com/rust-lang/rust/pull/26884
8960 [rte]: https://github.com/rust-lang/rust/pull/26950
8961 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8962 [search]: https://github.com/rust-lang/rust/pull/26327
8963 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8964 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8965 [sh]: https://github.com/rust-lang/rust/pull/27280
8966 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8967 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8968 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8969 [st]: https://github.com/rust-lang/rust/pull/26630
8970 [win1]: https://github.com/rust-lang/rust/pull/26569
8971 [win2]: https://github.com/rust-lang/rust/pull/26741
8972 [win3]: https://github.com/rust-lang/rust/pull/26741
8973 [win4]: https://github.com/rust-lang/rust/pull/27210
8974 [xp]: https://github.com/rust-lang/rust/pull/26569
8976 Version 1.2.0 (2015-08-07)
8977 ==========================
8979 * ~1200 changes, numerous bugfixes
8984 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8985 like `Rc` to contain types without a fixed size, arrays and trait
8986 objects, finally enabling use of `Rc<[T]>` and completing the
8987 implementation of DST.
8988 * [Parallel codegen][parcodegen] is now working again, which can
8989 substantially speed up large builds in debug mode; It also gets
8990 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8991 jobs). It's not enabled by default, but will be "in the near
8992 future". It can be activated with the `-C codegen-units=N` flag to
8994 * This is the first release with [experimental support for linking
8995 with the MSVC linker and lib C on Windows (instead of using the GNU
8996 variants via MinGW)][win]. It is yet recommended only for the most
8997 intrepid Rustaceans.
8998 * Benchmark compilations are showing a 30% improvement in
8999 bootstrapping over 1.1.
9004 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9005 unicode case mapping, which is a previously-planned change in
9006 behavior and considered a bugfix.
9007 * [`mem::align_of`] now specifies [the *minimum alignment* for
9008 T][align], which is usually the alignment programs are interested
9009 in, and the same value reported by clang's
9010 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9012 * [The `#[packed]` attribute is no longer silently accepted by the
9013 compiler][packed]. This attribute did nothing and code that
9014 mentioned it likely did not work as intended.
9015 * Associated type defaults are [now behind the
9016 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9017 defaults *did not work*, but could be mentioned syntactically. As
9018 such this breakage has minimal impact.
9023 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9024 matching against dereferenceable values.
9029 * The [`Extend`] trait, which grows a collection from an iterator, is
9030 implemented over iterators of references, for `String`, `Vec`,
9031 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9032 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9033 * The [`iter::once`] function returns an iterator that yields a single
9034 element, and [`iter::empty`] returns an iterator that yields no
9036 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9037 over substring matches.
9038 * [`Cell`] and [`RefCell`] both implement `Eq`.
9039 * A number of methods for wrapping arithmetic are added to the
9040 integral types, [`wrapping_div`], [`wrapping_rem`],
9041 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9042 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9043 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9044 type.. It is illegal for the default arithmetic operations in Rust
9045 to overflow; the desire to wrap must be explicit.
9046 * The `{:#?}` formatting specifier [displays the alternate,
9047 pretty-printed][debugfmt] form of the `Debug` formatter. This
9048 feature was actually introduced prior to 1.0 with little
9050 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9051 for writing data to formatted strings, similar to [`io::Write`].
9052 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9053 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9054 are used by code generators to emit implementations of [`Debug`].
9055 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9056 methods that convert case, following Unicode case mapping.
9057 * It is now easier to handle poisoned locks. The [`PoisonError`]
9058 type, returned by failing lock operations, exposes `into_inner`,
9059 `get_ref`, and `get_mut`, which all give access to the inner lock
9060 guard, and allow the poisoned lock to continue to operate. The
9061 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9062 poisoned lock without attempting to take the lock.
9063 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9064 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9065 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9066 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9068 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9074 * `rustc` employs smarter heuristics for guessing at [typos].
9075 * `rustc` emits more efficient code for [no-op conversions between
9076 unsafe pointers][nop].
9077 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9078 resulting in faster compile times and smaller code.
9080 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9081 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9082 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9083 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9084 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9085 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9086 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9087 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9088 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9089 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9090 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9091 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9092 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9093 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9094 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9095 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9096 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9097 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9098 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9099 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9100 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9101 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9102 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9103 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9104 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9105 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9106 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9107 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9108 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9109 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9110 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9111 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9112 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9113 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9114 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9115 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9116 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9117 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9118 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9119 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9120 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9121 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9122 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9123 [align]: https://github.com/rust-lang/rust/pull/25646
9124 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9125 [typos]: https://github.com/rust-lang/rust/pull/26087
9126 [nop]: https://github.com/rust-lang/rust/pull/26336
9127 [fat]: https://github.com/rust-lang/rust/pull/26411
9128 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9129 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9130 [packed]: https://github.com/rust-lang/rust/pull/25541
9131 [ad]: https://github.com/rust-lang/rust/pull/27382
9132 [win]: https://github.com/rust-lang/rust/pull/25350
9134 Version 1.1.0 (2015-06-25)
9135 =========================
9137 * ~850 changes, numerous bugfixes
9142 * The [`std::fs` module has been expanded][fs] to expand the set of
9143 functionality exposed:
9144 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9145 don't incur a syscall on some platforms.
9146 * A `symlink_metadata` function has been added.
9147 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9148 access to all underlying information.
9149 * The compiler now contains extended explanations of many errors. When an error
9150 with an explanation occurs the compiler suggests using the `--explain` flag
9151 to read the explanation. Error explanations are also [available online][err-index].
9152 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9153 well as other work, the time to bootstrap the compiler decreased by
9159 * The [`str::split_whitespace`] method splits a string on unicode
9160 whitespace boundaries.
9161 * On both Windows and Unix, new extension traits provide conversion of
9162 I/O types to and from the underlying system handles. On Unix, these
9163 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9164 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9165 `TcpListener`, and `UpdSocket`. Further implementations for
9166 `std::process` will be stabilized later.
9167 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9168 Windows, symlinks can be created with
9169 `std::os::windows::symlink_dir` and
9170 `std::os::windows::symlink_file`.
9171 * The `mpsc::Receiver` type can now be converted into an iterator with
9172 `into_iter` on the [`IntoIterator`] trait.
9173 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9174 implementation of the [`From`] trait.
9175 * The `Debug` implementation for `RangeFull` [creates output that is
9176 more consistent with other implementations][rf].
9177 * [`Debug` is implemented for `File`][file].
9178 * The `Default` implementation for `Arc` [no longer requires `Sync +
9180 * [The `Iterator` methods `count`, `nth`, and `last` have been
9181 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9182 * Incorrect handling of paths on Windows has been improved in both the
9183 compiler and the standard library.
9184 * [`AtomicPtr` gained a `Default` implementation][ap].
9185 * In accordance with Rust's policy on arithmetic overflow `abs` now
9186 [panics on overflow when debug assertions are enabled][abs].
9187 * The [`Cloned`] iterator, which was accidentally left unstable for
9188 1.0 [has been stabilized][c].
9189 * The [`Incoming`] iterator, which iterates over incoming TCP
9190 connections, and which was accidentally unnamable in 1.0, [is now
9191 properly exported][inc].
9192 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9193 `sift_up` or `sift_down` panic][bh].
9194 * The [`split_off`] method of `LinkedList` [no longer corrupts
9195 the list in certain scenarios][ll].
9200 * Type checking performance [has improved notably][sk] with
9201 [multiple improvements][pre].
9202 * The compiler [suggests code changes][ch] for more errors.
9203 * rustc and it's build system have experimental support for [building
9204 toolchains against MUSL][m] instead of glibc on Linux.
9205 * The compiler defines the `target_env` cfg value, which is used for
9206 distinguishing toolchains that are otherwise for the same
9207 platform. Presently this is set to `gnu` for common GNU Linux
9208 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9209 * The [`cargo rustc`][crc] command invokes a build with custom flags
9211 * [Android executables are always position independent][pie].
9212 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9215 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9216 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9217 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9218 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9219 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9220 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9221 [rf]: https://github.com/rust-lang/rust/pull/24491
9222 [err-index]: https://doc.rust-lang.org/error-index.html
9223 [sk]: https://github.com/rust-lang/rust/pull/24615
9224 [pre]: https://github.com/rust-lang/rust/pull/25323
9225 [file]: https://github.com/rust-lang/rust/pull/24598
9226 [ch]: https://github.com/rust-lang/rust/pull/24683
9227 [arc]: https://github.com/rust-lang/rust/pull/24695
9228 [si]: https://github.com/rust-lang/rust/pull/24701
9229 [ap]: https://github.com/rust-lang/rust/pull/24834
9230 [m]: https://github.com/rust-lang/rust/pull/24777
9231 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9232 [crc]: https://github.com/rust-lang/cargo/pull/1568
9233 [pie]: https://github.com/rust-lang/rust/pull/24953
9234 [abs]: https://github.com/rust-lang/rust/pull/25441
9235 [c]: https://github.com/rust-lang/rust/pull/25496
9236 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9237 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9238 [inc]: https://github.com/rust-lang/rust/pull/25522
9239 [bh]: https://github.com/rust-lang/rust/pull/25856
9240 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9241 [ll]: https://github.com/rust-lang/rust/pull/26022
9242 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9243 [drop]: https://github.com/rust-lang/rust/pull/24935
9245 Version 1.0.0 (2015-05-15)
9246 ========================
9248 * ~1500 changes, numerous bugfixes
9253 * The vast majority of the standard library is now `#[stable]`. It is
9254 no longer possible to use unstable features with a stable build of
9256 * Many popular crates on [crates.io] now work on the stable release
9258 * Arithmetic on basic integer types now [checks for overflow in debug
9264 * Several [restrictions have been added to trait coherence][coh] in
9265 order to make it easier for upstream authors to change traits
9266 without breaking downstream code.
9267 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9268 improve error messages and macro behavior. For example, `0b1234` is
9269 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9270 * Trait bounds [are always invariant][inv], eliminating the need for
9271 the `PhantomFn` and `MarkerTrait` lang items, which have been
9273 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9274 "foo" as bar` syntax has been replaced with `extern crate foo as
9275 bar`, and Cargo now automatically translates "-" in *package* names
9276 to underscore for the crate name.
9277 * [Lifetime shadowing is an error][lt].
9278 * [`Send` no longer implies `'static`][send-rfc].
9279 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9280 `MyType::default()`.
9281 * Primitive types [now have inherent methods][prim-inherent],
9282 obviating the need for extension traits like `SliceExt`.
9283 * Methods with `Self: Sized` in their `where` clause are [considered
9284 object-safe][self-sized], allowing many extension traits like
9285 `IteratorExt` to be merged into the traits they extended.
9286 * You can now [refer to associated types][assoc-where] whose
9287 corresponding trait bounds appear only in a `where` clause.
9288 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9289 like `Send` and `Sync` are now library-defined.
9290 * A [Reflect trait][reflect] was introduced, which means that
9291 downcasting via the `Any` trait is effectively limited to concrete
9292 types. This helps retain the potentially-important "parametricity"
9293 property: generic code cannot behave differently for different type
9294 arguments except in minor ways.
9295 * The `unsafe_destructor` feature is now deprecated in favor of the
9296 [new `dropck`][dropck]. This change is a major reduction in unsafe
9302 * The `thread_local` module [has been renamed to `std::thread`][th].
9303 * The methods of `IteratorExt` [have been moved to the `Iterator`
9305 * Several traits that implement Rust's conventions for type
9306 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9307 [centralized in the `std::convert` module][con].
9308 * The `FromError` trait [was removed in favor of `From`][fe].
9309 * The basic sleep function [has moved to
9310 `std::thread::sleep_ms`][slp].
9311 * The `splitn` function now takes an `n` parameter that represents the
9312 number of items yielded by the returned iterator [instead of the
9313 number of 'splits'][spl].
9314 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9315 * [Derived implementations of `PartialOrd` now order enums according
9316 to their explicitly-assigned discriminants][po].
9317 * [Methods for searching strings are generic over `Pattern`s][pat],
9318 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9320 * [In method resolution, object methods are resolved before inherent
9322 * [`String::from_str` has been deprecated in favor of the `From` impl,
9323 `String::from`][sf].
9324 * [`io::Error` implements `Sync`][ios].
9325 * [The `words` method on `&str` has been replaced with
9326 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9328 * The new path and IO modules are complete and `#[stable]`. This
9329 was the major library focus for this cycle.
9330 * The path API was [revised][path-normalize] to normalize `.`,
9331 adjusting the tradeoffs in favor of the most common usage.
9332 * A large number of remaining APIs in `std` were also stabilized
9333 during this cycle; about 75% of the non-deprecated API surface
9335 * The new [string pattern API][string-pattern] landed, which makes
9336 the string slice API much more internally consistent and flexible.
9337 * A new set of [generic conversion traits][conversion] replaced
9338 many existing ad hoc traits.
9339 * Generic numeric traits were [completely removed][num-traits]. This
9340 was made possible thanks to inherent methods for primitive types,
9341 and the removal gives maximal flexibility for designing a numeric
9342 hierarchy in the future.
9343 * The `Fn` traits are now related via [inheritance][fn-inherit]
9344 and provide ergonomic [blanket implementations][fn-blanket].
9345 * The `Index` and `IndexMut` traits were changed to
9346 [take the index by value][index-value], enabling code like
9347 `hash_map["string"]` to work.
9348 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9349 `Copy` data is known to be `Clone` as well.
9354 * Many errors now have extended explanations that can be accessed with
9355 the `--explain` flag to `rustc`.
9356 * Many new examples have been added to the standard library
9358 * rustdoc has received a number of improvements focused on completion
9360 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9361 * Much headway was made on ecosystem-wide CI, making it possible
9362 to [compare builds for breakage][ci-compare].
9365 [crates.io]: http://crates.io
9366 [clo]: https://github.com/rust-lang/rust/pull/24034
9367 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9368 [con]: https://github.com/rust-lang/rust/pull/23875
9369 [cr]: https://github.com/rust-lang/rust/pull/23419
9370 [fe]: https://github.com/rust-lang/rust/pull/23879
9371 [ie]: https://github.com/rust-lang/rust/pull/23300
9372 [inv]: https://github.com/rust-lang/rust/pull/23938
9373 [ios]: https://github.com/rust-lang/rust/pull/24133
9374 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9375 [lt]: https://github.com/rust-lang/rust/pull/24057
9376 [meth]: https://github.com/rust-lang/rust/pull/24056
9377 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9378 [po]: https://github.com/rust-lang/rust/pull/24270
9379 [sf]: https://github.com/rust-lang/rust/pull/24517
9380 [slp]: https://github.com/rust-lang/rust/pull/23949
9381 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9382 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9383 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9384 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9385 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9386 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9387 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9388 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9389 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9390 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9391 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9392 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9393 [reflect]: https://github.com/rust-lang/rust/pull/23712
9394 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9395 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9396 [index-value]: https://github.com/rust-lang/rust/pull/23601
9397 [dropck]: https://github.com/rust-lang/rfcs/pull/769
9398 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9399 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9400 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9401 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9402 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9405 Version 1.0.0-alpha.2 (2015-02-20)
9406 =====================================
9408 * ~1300 changes, numerous bugfixes
9412 * The various I/O modules were [overhauled][io-rfc] to reduce
9413 unnecessary abstractions and provide better interoperation with
9414 the underlying platform. The old `io` module remains temporarily
9416 * The standard library now [participates in feature gating][feat],
9417 so use of unstable libraries now requires a `#![feature(...)]`
9418 attribute. The impact of this change is [described on the
9419 forum][feat-forum]. [RFC][feat-rfc].
9423 * `for` loops [now operate on the `IntoIterator` trait][into],
9424 which eliminates the need to call `.iter()`, etc. to iterate
9425 over collections. There are some new subtleties to remember
9426 though regarding what sort of iterators various types yield, in
9427 particular that `for foo in bar { }` yields values from a move
9428 iterator, destroying the original collection. [RFC][into-rfc].
9429 * Objects now have [default lifetime bounds][obj], so you don't
9430 have to write `Box<Trait+'static>` when you don't care about
9431 storing references. [RFC][obj-rfc].
9432 * In types that implement `Drop`, [lifetimes must outlive the
9433 value][drop]. This will soon make it possible to safely
9434 implement `Drop` for types where `#[unsafe_destructor]` is now
9435 required. Read the [gorgeous RFC][drop-rfc] for details.
9436 * The fully qualified <T as Trait>::X syntax lets you set the Self
9437 type for a trait method or associated type. [RFC][ufcs-rfc].
9438 * References to types that implement `Deref<U>` now [automatically
9439 coerce to references][deref] to the dereferenced type `U`,
9440 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9441 should eliminate many unsightly uses of `&*`, as when converting
9442 from references to vectors into references to
9443 slices. [RFC][deref-rfc].
9444 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9445 `|:|`) is obsolete and closure kind is inferred from context.
9446 * [`Self` is a keyword][Self].
9450 * The `Show` and `String` formatting traits [have been
9451 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9452 their related purposes. Automatically getting a string
9453 conversion to use with `format!("{:?}", something_to_debug)` is
9454 now written `#[derive(Debug)]`.
9455 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9456 OsStr}`, provide strings in platform-specific encodings for easier
9457 interop with system APIs. [RFC][osstr-rfc].
9458 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9459 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9460 creating raw pointers.
9464 * Certain long error messages of the form 'expected foo found bar'
9465 are now [split neatly across multiple
9466 lines][multiline]. Examples in the PR.
9467 * On Unix Rust can be [uninstalled][un] by running
9468 `/usr/local/lib/rustlib/uninstall.sh`.
9469 * The `#[rustc_on_unimplemented]` attribute, requiring the
9470 'on_unimplemented' feature, lets rustc [display custom error
9471 messages when a trait is expected to be implemented for a type
9476 * Rust is tested against a [LALR grammar][lalr], which parses
9477 almost all the Rust files that rustc does.
9479 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9480 [close]: https://github.com/rust-lang/rust/pull/21843
9481 [deref]: https://github.com/rust-lang/rust/pull/21351
9482 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9483 [drop]: https://github.com/rust-lang/rust/pull/21972
9484 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9485 [feat]: https://github.com/rust-lang/rust/pull/21248
9486 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9487 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9488 [fmt]: https://github.com/rust-lang/rust/pull/21457
9489 [into]: https://github.com/rust-lang/rust/pull/20790
9490 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9491 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9492 [lalr]: https://github.com/rust-lang/rust/pull/21452
9493 [multiline]: https://github.com/rust-lang/rust/pull/19870
9494 [obj]: https://github.com/rust-lang/rust/pull/22230
9495 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9496 [onun]: https://github.com/rust-lang/rust/pull/20889
9497 [osstr]: https://github.com/rust-lang/rust/pull/21488
9498 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9499 [Self]: https://github.com/rust-lang/rust/pull/22158
9500 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9501 [un]: https://github.com/rust-lang/rust/pull/22256
9504 Version 1.0.0-alpha (2015-01-09)
9505 ==================================
9507 * ~2400 changes, numerous bugfixes
9511 * The language itself is considered feature complete for 1.0,
9512 though there will be many usability improvements and bugfixes
9513 before the final release.
9514 * Nearly 50% of the public API surface of the standard library has
9515 been declared 'stable'. Those interfaces are unlikely to change
9517 * The long-running debate over integer types has been
9518 [settled][ints]: Rust will ship with types named `isize` and
9519 `usize`, rather than `int` and `uint`, for pointer-sized
9520 integers. Guidelines will be rolled out during the alpha cycle.
9521 * Most crates that are not `std` have been moved out of the Rust
9522 distribution into the Cargo ecosystem so they can evolve
9523 separately and don't need to be stabilized as quickly, including
9524 'time', 'getopts', 'num', 'regex', and 'term'.
9525 * Documentation continues to be expanded with more API coverage, more
9526 examples, and more in-depth explanations. The guides have been
9527 consolidated into [The Rust Programming Language][trpl].
9528 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9529 * All official Rust binary installers now come with [Cargo], the
9530 Rust package manager.
9534 * Closures have been [completely redesigned][unboxed] to be
9535 implemented in terms of traits, can now be used as generic type
9536 bounds and thus monomorphized and inlined, or via an opaque
9537 pointer (boxed) as in the old system. The new system is often
9538 referred to as 'unboxed' closures.
9539 * Traits now support [associated types][assoc], allowing families
9540 of related types to be defined together and used generically in
9542 * Enum variants are [namespaced by their type names][enum].
9543 * [`where` clauses][where] provide a more versatile and attractive
9544 syntax for specifying generic bounds, though the previous syntax
9546 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9548 * Rust [no longer has a runtime][rt] of any description, and only
9549 supports OS threads, not green threads.
9550 * At long last, Rust has been overhauled for 'dynamically-sized
9551 types' ([DST]), which integrates 'fat pointers' (object types,
9552 arrays, and `str`) more deeply into the type system, making it
9554 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9555 `..j` that produce range types and which, when combined with the
9556 `Index` operator and multidispatch, leads to a convenient slice
9558 * The new range syntax revealed an ambiguity in the fixed-length
9559 array syntax, so now fixed length arrays [are written `[T;
9561 * The `Copy` trait is no longer implemented automatically. Unsafe
9562 pointers no longer implement `Sync` and `Send` so types
9563 containing them don't automatically either. `Sync` and `Send`
9564 are now 'unsafe traits' so one can "forcibly" implement them via
9565 `unsafe impl` if a type confirms to the requirements for them
9566 even though the internals do not (e.g. structs containing unsafe
9567 pointers like `Arc`). These changes are intended to prevent some
9568 footguns and are collectively known as [opt-in built-in
9569 traits][oibit] (though `Sync` and `Send` will soon become pure
9570 library types unknown to the compiler).
9571 * Operator traits now take their operands [by value][ops], and
9572 comparison traits can use multidispatch to compare one type
9573 against multiple other types, allowing e.g. `String` to be
9574 compared with `&str`.
9575 * `if let` and `while let` are no longer feature-gated.
9576 * Rust has adopted a more [uniform syntax for escaping unicode
9577 characters][unicode].
9578 * `macro_rules!` [has been declared stable][mac]. Though it is a
9579 flawed system it is sufficiently popular that it must be usable
9580 for 1.0. Effort has gone into [future-proofing][mac-future] it
9581 in ways that will allow other macro systems to be developed in
9582 parallel, and won't otherwise impact the evolution of the
9584 * The prelude has been [pared back significantly][prelude] such
9585 that it is the minimum necessary to support the most pervasive
9586 code patterns, and through [generalized where clauses][where]
9587 many of the prelude extension traits have been consolidated.
9588 * Rust's rudimentary reflection [has been removed][refl], as it
9589 incurred too much code generation for little benefit.
9590 * [Struct variants][structvars] are no longer feature-gated.
9591 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9592 known as 'higher-ranked trait bounds', this crucially allows
9593 unboxed closures to work.
9594 * Macros invocations surrounded by parens or square brackets and
9595 not terminated by a semicolon are [parsed as
9596 expressions][macros], which makes expressions like `vec![1i32,
9597 2, 3].len()` work as expected.
9598 * Trait objects now implement their traits automatically, and
9599 traits that can be coerced to objects now must be [object
9601 * Automatically deriving traits is now done with `#[derive(...)]`
9602 not `#[deriving(...)]` for [consistency with other naming
9603 conventions][derive].
9604 * Importing the containing module or enum at the same time as
9605 items or variants they contain is [now done with `self` instead
9606 of `mod`][self], as in use `foo::{self, bar}`
9607 * Glob imports are no longer feature-gated.
9608 * The `box` operator and `box` patterns have been feature-gated
9609 pending a redesign. For now unique boxes should be allocated
9610 like other containers, with `Box::new`.
9614 * A [series][coll1] of [efforts][coll2] to establish
9615 [conventions][coll3] for collections types has resulted in API
9616 improvements throughout the standard library.
9617 * New [APIs for error handling][err] provide ergonomic interop
9618 between error types, and [new conventions][err-conv] describe
9619 more clearly the recommended error handling strategies in Rust.
9620 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9621 it is easier to discuss failure in the context of error handling
9622 without making clarifications as to whether you are referring to
9623 the 'fail' macro or failure more generally.
9624 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9625 syscall when available.
9626 * The 'serialize' crate has been renamed 'rustc-serialize' and
9627 moved out of the distribution to Cargo. Although it is widely
9628 used now, it is expected to be superseded in the near future.
9629 * The `Show` formatter, typically implemented with
9630 `#[derive(Show)]` is [now requested with the `{:?}`
9631 specifier][show] and is intended for use by all types, for uses
9632 such as `println!` debugging. The new `String` formatter must be
9633 implemented by hand, uses the `{}` specifier, and is intended
9634 for full-fidelity conversions of things that can logically be
9635 represented as strings.
9639 * [Flexible target specification][flex] allows rustc's code
9640 generation to be configured to support otherwise-unsupported
9642 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9643 respective debuggers with Rust-appropriate pretty-printing.
9644 * The Windows installation of Rust is distributed with the
9645 MinGW components currently required to link binaries on that
9650 * Nullable enum optimizations have been extended to more types so
9651 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9652 space than the inner types themselves.
9653 * Work has begun on supporting AArch64.
9655 [Cargo]: https://crates.io
9656 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9657 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9658 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9659 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9660 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9661 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9662 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9663 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9664 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9665 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9666 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9667 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9668 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9669 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9670 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9671 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9672 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9673 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9674 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9675 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9676 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9677 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9678 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9679 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9680 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9681 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9682 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9683 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9684 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9685 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9686 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9687 [trpl]: https://doc.rust-lang.org/book/index.html
9688 [rbe]: http://rustbyexample.com/
9691 Version 0.12.0 (2014-10-09)
9692 =============================
9694 * ~1900 changes, numerous bugfixes
9698 * The introductory documentation (now called The Rust Guide) has
9699 been completely rewritten, as have a number of supplementary
9701 * Rust's package manager, Cargo, continues to improve and is
9702 sometimes considered to be quite awesome.
9703 * Many API's in `std` have been reviewed and updated for
9704 consistency with the in-development Rust coding
9705 guidelines. The standard library documentation tracks
9706 stabilization progress.
9707 * Minor libraries have been moved out-of-tree to the rust-lang org
9708 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9709 be installed with Cargo.
9710 * Lifetime elision allows lifetime annotations to be left off of
9711 function declarations in many common scenarios.
9712 * Rust now works on 64-bit Windows.
9715 * Indexing can be overloaded with the `Index` and `IndexMut`
9717 * The `if let` construct takes a branch only if the `let` pattern
9718 matches, currently behind the 'if_let' feature gate.
9719 * 'where clauses', a more flexible syntax for specifying trait
9720 bounds that is more aesthetic, have been added for traits and
9721 free functions. Where clauses will in the future make it
9722 possible to constrain associated types, which would be
9723 impossible with the existing syntax.
9724 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9725 the 'slicing_syntax' feature gate, and can be overloaded with
9726 the `Slice` or `SliceMut` traits.
9727 * The syntax for matching of sub-slices has been changed to use a
9728 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9729 consistency with other uses of `..` and to future-proof
9730 potential additional uses of the syntax.
9731 * The syntax for matching inclusive ranges in patterns has changed
9732 from `0..3` to `0...4` to be consistent with the exclusive range
9734 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9735 c]`) has been put behind the 'advanced_slice_patterns' feature
9736 gate and may be removed in the future.
9737 * Components of tuples and tuple structs can be extracted using
9738 the `value.0` syntax, currently behind the `tuple_indexing`
9740 * The `#[crate_id]` attribute is no longer supported; versioning
9741 is handled by the package manager.
9742 * Renaming crate imports are now written `extern crate foo as bar`
9743 instead of `extern crate bar = foo`.
9744 * Renaming use statements are now written `use foo as bar` instead
9746 * `let` and `match` bindings and argument names in macros are now
9748 * The new, more efficient, closure types ('unboxed closures') have
9749 been added under a feature gate, 'unboxed_closures'. These will
9750 soon replace the existing closure types, once higher-ranked
9751 trait lifetimes are added to the language.
9752 * `move` has been added as a keyword, for indicating closures
9753 that capture by value.
9754 * Mutation and assignment is no longer allowed in pattern guards.
9755 * Generic structs and enums can now have trait bounds.
9756 * The `Share` trait is now called `Sync` to free up the term
9757 'shared' to refer to 'shared reference' (the default reference
9759 * Dynamically-sized types have been mostly implemented,
9760 unifying the behavior of fat-pointer types with the rest of the
9762 * As part of dynamically-sized types, the `Sized` trait has been
9763 introduced, which qualifying types implement by default, and
9764 which type parameters expect by default. To specify that a type
9765 parameter does not need to be sized, write `<Sized? T>`. Most
9766 types are `Sized`, notable exceptions being unsized arrays
9767 (`[T]`) and trait types.
9768 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9769 * Lifetime bounds can now be applied to type parameters and object
9771 * The old, reference counted GC type, `Gc<T>` which was once
9772 denoted by the `@` sigil, has finally been removed. GC will be
9773 revisited in the future.
9776 * Library documentation has been improved for a number of modules.
9777 * Bit-vectors, collections::bitv has been modernized.
9778 * The url crate is deprecated in favor of
9779 http://github.com/servo/rust-url, which can be installed with
9781 * Most I/O stream types can be cloned and subsequently closed from
9783 * A `std::time::Duration` type has been added for use in I/O
9784 methods that rely on timers, as well as in the 'time' crate's
9785 `Timespec` arithmetic.
9786 * The runtime I/O abstraction layer that enabled the green thread
9787 scheduler to do non-thread-blocking I/O has been removed, along
9788 with the libuv-based implementation employed by the green thread
9789 scheduler. This will greatly simplify the future I/O work.
9790 * `collections::btree` has been rewritten to have a more
9791 idiomatic and efficient design.
9794 * rustdoc output now indicates the stability levels of API's.
9795 * The `--crate-name` flag can specify the name of the crate
9796 being compiled, like `#[crate_name]`.
9797 * The `-C metadata` specifies additional metadata to hash into
9798 symbol names, and `-C extra-filename` specifies additional
9799 information to put into the output filename, for use by the
9800 package manager for versioning.
9801 * debug info generation has continued to improve and should be
9802 more reliable under both gdb and lldb.
9803 * rustc has experimental support for compiling in parallel
9804 using the `-C codegen-units` flag.
9805 * rustc no longer encodes rpath information into binaries by
9809 * Stack usage has been optimized with LLVM lifetime annotations.
9810 * Official Rust binaries on Linux are more compatible with older
9811 kernels and distributions, built on CentOS 5.10.
9814 Version 0.11.0 (2014-07-02)
9815 ==========================
9817 * ~1700 changes, numerous bugfixes
9820 * ~[T] has been removed from the language. This type is superseded by
9822 * ~str has been removed from the language. This type is superseded by
9824 * ~T has been removed from the language. This type is superseded by the
9826 * @T has been removed from the language. This type is superseded by the
9827 standard library's std::gc::Gc<T> type.
9828 * Struct fields are now all private by default.
9829 * Vector indices and shift amounts are both required to be a `uint`
9830 instead of any integral type.
9831 * Byte character, byte string, and raw byte string literals are now all
9832 supported by prefixing the normal literal with a `b`.
9833 * Multiple ABIs are no longer allowed in an ABI string
9834 * The syntax for lifetimes on closures/procedures has been tweaked
9835 slightly: `<'a>|A, B|: 'b + K -> T`
9836 * Floating point modulus has been removed from the language; however it
9837 is still provided by a library implementation.
9838 * Private enum variants are now disallowed.
9839 * The `priv` keyword has been removed from the language.
9840 * A closure can no longer be invoked through a &-pointer.
9841 * The `use foo, bar, baz;` syntax has been removed from the language.
9842 * The transmute intrinsic no longer works on type parameters.
9843 * Statics now allow blocks/items in their definition.
9844 * Trait bounds are separated from objects with + instead of : now.
9845 * Objects can no longer be read while they are mutably borrowed.
9846 * The address of a static is now marked as insignificant unless the
9847 #[inline(never)] attribute is placed it.
9848 * The #[unsafe_destructor] attribute is now behind a feature gate.
9849 * Struct literals are no longer allowed in ambiguous positions such as
9850 if, while, match, and for..in.
9851 * Declaration of lang items and intrinsics are now feature-gated by
9853 * Integral literals no longer default to `int`, and floating point
9854 literals no longer default to `f64`. Literals must be suffixed with an
9855 appropriate type if inference cannot determine the type of the
9857 * The Box<T> type is no longer implicitly borrowed to &mut T.
9858 * Procedures are now required to not capture borrowed references.
9861 * The standard library is now a "facade" over a number of underlying
9862 libraries. This means that development on the standard library should
9863 be speedier due to smaller crates, as well as a clearer line between
9865 * A new library, libcore, lives under the standard library's facade
9866 which is Rust's "0-assumption" library, suitable for embedded and
9867 kernel development for example.
9868 * A regex crate has been added to the standard distribution. This crate
9869 includes statically compiled regular expressions.
9870 * The unwrap/unwrap_err methods on Result require a Show bound for
9871 better error messages.
9872 * The return types of the std::comm primitives have been centralized
9873 around the Result type.
9874 * A number of I/O primitives have gained the ability to time out their
9876 * A number of I/O primitives have gained the ability to close their
9877 reading/writing halves to cancel pending operations.
9878 * Reverse iterator methods have been removed in favor of `rev()` on
9879 their forward-iteration counterparts.
9880 * A bitflags! macro has been added to enable easy interop with C and
9881 management of bit flags.
9882 * A debug_assert! macro is now provided which is disabled when
9883 `--cfg ndebug` is passed to the compiler.
9884 * A graphviz crate has been added for creating .dot files.
9885 * The std::cast module has been migrated into std::mem.
9886 * The std::local_data api has been migrated from freestanding functions
9887 to being based on methods.
9888 * The Pod trait has been renamed to Copy.
9889 * jemalloc has been added as the default allocator for types.
9890 * The API for allocating memory has been changed to use proper alignment
9891 and sized deallocation
9892 * Connecting a TcpStream or binding a TcpListener is now based on a
9893 string address and a u16 port. This allows connecting to a hostname as
9895 * The Reader trait now contains a core method, read_at_least(), which
9896 correctly handles many repeated 0-length reads.
9897 * The process-spawning API is now centered around a builder-style
9899 * The :? printing qualifier has been moved from the standard library to
9900 an external libdebug crate.
9901 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9902 have been renamed to Eq/Ord.
9903 * The select/plural methods have been removed from format!. The escapes
9904 for { and } have also changed from \{ and \} to {{ and }},
9906 * The TaskBuilder API has been re-worked to be a true builder, and
9907 extension traits for spawning native/green tasks have been added.
9910 * All breaking changes to the language or libraries now have their
9911 commit message annotated with `[breaking-change]` to allow for easy
9912 discovery of breaking changes.
9913 * The compiler will now try to suggest how to annotate lifetimes if a
9914 lifetime-related error occurs.
9915 * Debug info continues to be improved greatly with general bug fixes and
9916 better support for situations like link time optimization (LTO).
9917 * Usage of syntax extensions when cross-compiling has been fixed.
9918 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9919 -fdata-sections and --gc-sections has been enabled by default
9920 * The compiler is now stricter about where it will load module files
9921 from when a module is declared via `mod foo;`.
9922 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9923 Syntax extensions are now discovered via a "plugin registrar" type
9924 which will be extended in the future to other various plugins.
9925 * Lints have been restructured to allow for dynamically loadable lints.
9926 * A number of rustdoc improvements:
9927 * The HTML output has been visually redesigned.
9928 * Markdown is now powered by hoedown instead of sundown.
9929 * Searching heuristics have been greatly improved.
9930 * The search index has been reduced in size by a great amount.
9931 * Cross-crate documentation via `pub use` has been greatly improved.
9932 * Primitive types are now hyperlinked and documented.
9933 * Documentation has been moved from static.rust-lang.org/doc to
9935 * A new sandbox, play.rust-lang.org, is available for running and
9936 sharing rust code examples on-line.
9937 * Unused attributes are now more robustly warned about.
9938 * The dead_code lint now warns about unused struct fields.
9939 * Cross-compiling to iOS is now supported.
9940 * Cross-compiling to mipsel is now supported.
9941 * Stability attributes are now inherited by default and no longer apply
9942 to intra-crate usage, only inter-crate usage.
9943 * Error message related to non-exhaustive match expressions have been
9947 Version 0.10 (2014-04-03)
9948 =========================
9950 * ~1500 changes, numerous bugfixes
9953 * A new RFC process is now in place for modifying the language.
9954 * Patterns with `@`-pointers have been removed from the language.
9955 * Patterns with unique vectors (`~[T]`) have been removed from the
9957 * Patterns with unique strings (`~str`) have been removed from the
9959 * `@str` has been removed from the language.
9960 * `@[T]` has been removed from the language.
9961 * `@self` has been removed from the language.
9962 * `@Trait` has been removed from the language.
9963 * Headers on `~` allocations which contain `@` boxes inside the type for
9964 reference counting have been removed.
9965 * The semantics around the lifetimes of temporary expressions have changed,
9966 see #3511 and #11585 for more information.
9967 * Cross-crate syntax extensions are now possible, but feature gated. See
9968 #11151 for more information. This includes both `macro_rules!` macros as
9969 well as syntax extensions such as `format!`.
9970 * New lint modes have been added, and older ones have been turned on to be
9972 * Unnecessary parentheses
9975 * Uppercase variables
9976 * Publicly visible private types
9977 * `#[deriving]` with raw pointers
9978 * Unsafe functions can no longer be coerced to closures.
9979 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9980 * The `#[simd]` attribute is now behind a feature gate.
9981 * Visibility is no longer allowed on `extern crate` statements, and
9982 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9983 * Trailing commas are now allowed in argument lists and tuple patterns.
9984 * The `do` keyword has been removed, it is now a reserved keyword.
9985 * Default type parameters have been implemented, but are feature gated.
9986 * Borrowed variables through captures in closures are now considered soundly.
9987 * `extern mod` is now `extern crate`
9988 * The `Freeze` trait has been removed.
9989 * The `Share` trait has been added for types that can be shared among
9991 * Labels in macros are now hygienic.
9992 * Expression/statement macro invocations can be delimited with `{}` now.
9993 * Treatment of types allowed in `static mut` locations has been tweaked.
9994 * The `*` and `.` operators are now overloadable through the `Deref` and
9996 * `~Trait` and `proc` no longer have `Send` bounds by default.
9997 * Partial type hints are now supported with the `_` type marker.
9998 * An `Unsafe` type was introduced for interior mutability. It is now
9999 considered undefined to transmute from `&T` to `&mut T` without using the
10001 * The #[linkage] attribute was implemented for extern statics/functions.
10002 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10003 * `Pod` was renamed to `Copy`.
10006 * The `libextra` library has been removed. It has now been decomposed into
10007 component libraries with smaller and more focused nuggets of
10008 functionality. The full list of libraries can be found on the
10009 documentation index page.
10010 * std: `std::condition` has been removed. All I/O errors are now propagated
10011 through the `Result` type. In order to assist with error handling, a
10012 `try!` macro for unwrapping errors with an early return and a lint for
10013 unused results has been added. See #12039 for more information.
10014 * std: The `vec` module has been renamed to `slice`.
10015 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10016 This will become the only growable vector in the future.
10017 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10018 are now found at `std::io::BufferedReader` instead of
10019 `std::io::buffered::BufferedReader`.
10020 * std: `print` and `println` are no longer in the prelude, the `print!` and
10021 `println!` macros are intended to be used instead.
10022 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10023 attempts to statically prevent cycles.
10024 * std: The standard distribution is adopting the policy of pushing failure
10025 to the user rather than failing in libraries. Many functions (such as
10026 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10027 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10028 deriving mode: `#[deriving(Show)]`.
10029 * std: `ToStr` is now implemented for all types implementing `Show`.
10030 * std: The formatting trait methods now take `&self` instead of `&T`
10031 * std: The `invert()` method on iterators has been renamed to `rev()`
10032 * std: `std::num` has seen a reduction in the genericity of its traits,
10033 consolidating functionality into a few core traits.
10034 * std: Backtraces are now printed on task failure if the environment
10035 variable `RUST_BACKTRACE` is present.
10036 * std: Naming conventions for iterators have been standardized. More details
10037 can be found on the wiki's style guide.
10038 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10039 still implement the function.
10040 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10041 * std: `assert_approx_eq!` has been removed
10042 * std: The `e` and `E` formatting specifiers for floats have been added to
10043 print them in exponential notation.
10044 * std: The `Times` trait has been removed
10045 * std: Indications of variance and opting out of builtin bounds is done
10046 through marker types in `std::kinds::marker` now
10047 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10048 `#[deriving(Hash)]` is now possible.
10049 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10050 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10051 * std: `Chan::new` is now `channel()`.
10052 * std: A new synchronous channel type has been implemented.
10053 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10054 * std: `hashmap` and `trie` have been moved to `libcollections`
10055 * std: `run` has been rolled into `io::process`
10056 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10057 * std: The equality and comparison traits have seen some reorganization.
10058 * std: `rand` has moved to `librand`.
10059 * std: `to_{lower,upper}case` has been implemented for `char`.
10060 * std: Logging has been moved to `liblog`.
10061 * collections: `HashMap` has been rewritten for higher performance and less
10063 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10064 it can be booted manually. The runtime guide has more information and
10066 * native: All I/O functionality except signals has been implemented.
10067 * green: Task spawning with `libgreen` has been optimized with stack caching
10068 and various trimming of code.
10069 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10070 * sync: The `extra::sync` module has been updated to modern rust (and moved
10071 to the `sync` library), tweaking and improving various interfaces while
10072 dropping redundant functionality.
10073 * sync: A new `Barrier` type has been added to the `sync` library.
10074 * sync: An efficient mutex for native and green tasks has been implemented.
10075 * serialize: The `base64` module has seen some improvement. It treats
10076 newlines better, has non-string error values, and has seen general
10078 * fourcc: A `fourcc!` macro was introduced
10079 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10080 hexadecimal literal.
10083 * `rustpkg` has been deprecated and removed from the main repository. Its
10084 replacement, `cargo`, is under development.
10085 * Nightly builds of rust are now available
10086 * The memory usage of rustc has been improved many times throughout this
10088 * The build process supports disabling rpath support for the rustc binary
10090 * Code generation has improved in some cases, giving more information to the
10091 LLVM optimization passes to enable more extensive optimizations.
10092 * Debuginfo compatibility with lldb on OSX has been restored.
10093 * The master branch is now gated on an android bot, making building for
10094 android much more reliable.
10095 * Output flags have been centralized into one `--emit` flag.
10096 * Crate type flags have been centralized into one `--crate-type` flag.
10097 * Codegen flags have been consolidated behind a `-C` flag.
10098 * Linking against outdated crates now has improved error messages.
10099 * Error messages with lifetimes will often suggest how to annotate the
10100 function to fix the error.
10101 * Many more types are documented in the standard library, and new guides
10103 * Many `rustdoc` improvements:
10104 * code blocks are syntax highlighted.
10105 * render standalone markdown files.
10106 * the --test flag tests all code blocks by default.
10107 * exported macros are displayed.
10108 * re-exported types have their documentation inlined at the location of the
10110 * search works across crates that have been rendered to the same output
10114 Version 0.9 (2014-01-09)
10115 ==========================
10117 * ~1800 changes, numerous bugfixes
10120 * The `float` type has been removed. Use `f32` or `f64` instead.
10121 * A new facility for enabling experimental features (feature gating) has
10122 been added, using the crate-level `#[feature(foo)]` attribute.
10123 * Managed boxes (@) are now behind a feature gate
10124 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10125 standard library's `Gc` or `Rc` types instead.
10126 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10127 * Jumping back to the top of a loop is now done with `continue` instead of
10129 * Strings can no longer be mutated through index assignment.
10130 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10131 hash delimiters, as in `r###"foo"###`.
10132 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10134 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10135 * `@fn`s have been removed.
10136 * `do` only works with procs in order to make it obvious what the cost
10138 * Single-element tuple-like structs can no longer be dereferenced to
10139 obtain the inner value. A more comprehensive solution for overloading
10140 the dereference operator will be provided in the future.
10141 * The `#[link(...)]` attribute has been replaced with
10142 `#[crate_id = "name#vers"]`.
10143 * Empty `impl`s must be terminated with empty braces and may not be
10144 terminated with a semicolon.
10145 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10146 no longer has any special meaning.
10147 * The old `fmt!` string formatting macro has been removed.
10148 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10149 `print!` and `println!`.
10150 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10151 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10152 `extern mod foo = "bar"` instead.
10153 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10154 * Macros can have attributes.
10155 * Macros can expand to items with attributes.
10156 * Macros can expand to multiple items.
10157 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10158 * Comments may be nested.
10159 * Values automatically coerce to trait objects they implement, without
10161 * Enum discriminants are no longer an entire word but as small as needed to
10162 contain all the variants. The `repr` attribute can be used to override
10163 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10164 `#[repr(C)]` to match C enums.
10165 * Non-string literals are not allowed in attributes (they never worked).
10166 * The FFI now supports variadic functions.
10167 * Octal numeric literals, as in `0o7777`.
10168 * The `concat!` syntax extension performs compile-time string concatenation.
10169 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10170 removed as Rust no longer uses segmented stacks.
10171 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10172 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10173 not `*`; ignoring remaining fields of a struct is also done with `..`,
10174 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10175 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10176 * `rustc` supports the "system" calling convention, which defaults to the
10177 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10179 * The `type_overflow` lint (default: warn) checks literals for overflow.
10180 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10181 * The `attribute_usage` lint (default: warn) warns about unknown
10183 * The `unknown_features` lint (default: warn) warns about unknown
10185 * The `dead_code` lint (default: warn) checks for dead code.
10186 * Rust libraries can be linked statically to one another
10187 * `#[link_args]` is behind the `link_args` feature gate.
10188 * Native libraries are now linked with `#[link(name = "foo")]`
10189 * Native libraries can be statically linked to a rust crate
10190 (`#[link(name = "foo", kind = "static")]`).
10191 * Native OS X frameworks are now officially supported
10192 (`#[link(name = "foo", kind = "framework")]`).
10193 * The `#[thread_local]` attribute creates thread-local (not task-local)
10194 variables. Currently behind the `thread_local` feature gate.
10195 * The `return` keyword may be used in closures.
10196 * Types that can be copied via a memcpy implement the `Pod` kind.
10197 * The `cfg` attribute can now be used on struct fields and enum variants.
10200 * std: The `option` and `result` API's have been overhauled to make them
10201 simpler, more consistent, and more composable.
10202 * std: The entire `std::io` module has been replaced with one that is
10203 more comprehensive and that properly interfaces with the underlying
10204 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10206 * std: `io::util` contains a number of useful implementations of
10207 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10208 `ZeroReader`, `TeeReader`.
10209 * std: The reference counted pointer type `extra::rc` moved into std.
10210 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10211 just a wrapper around it).
10212 * std: The `Either` type has been removed.
10213 * std: `fmt::Default` can be implemented for any type to provide default
10214 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10215 * std: The `rand` API continues to be tweaked.
10216 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10217 on failure in gdb, is now named `rust_fail`.
10218 * std: The `each_key` and `each_value` methods on `HashMap` have been
10219 replaced by the `keys` and `values` iterators.
10220 * std: Functions dealing with type size and alignment have moved from the
10221 `sys` module to the `mem` module.
10222 * std: The `path` module was written and API changed.
10223 * std: `str::from_utf8` has been changed to cast instead of allocate.
10224 * std: `starts_with` and `ends_with` methods added to vectors via the
10225 `ImmutableEqVector` trait, which is in the prelude.
10226 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10227 if the index is out of bounds.
10228 * std: Task failure no longer propagates between tasks, as the model was
10229 complex, expensive, and incompatible with thread-based tasks.
10230 * std: The `Any` type can be used for dynamic typing.
10231 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10233 * std: Methods that produce iterators generally do not have an `_iter`
10235 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10236 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10237 * std: `util::ignore` renamed to `prelude::drop`.
10238 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10240 * std: `vec::raw` has seen a lot of cleanup and API changes.
10241 * std: The standard library no longer includes any C++ code, and very
10242 minimal C, eliminating the dependency on libstdc++.
10243 * std: Runtime scheduling and I/O functionality has been factored out into
10244 extensible interfaces and is now implemented by two different crates:
10245 libnative, for native threading and I/O; and libgreen, for green threading
10246 and I/O. This paves the way for using the standard library in more limited
10247 embedded environments.
10248 * std: The `comm` module has been rewritten to be much faster, have a
10249 simpler, more consistent API, and to work for both native and green
10251 * std: All libuv dependencies have been moved into the rustuv crate.
10252 * native: New implementations of runtime scheduling on top of OS threads.
10253 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10255 * green: The green thread scheduler and message passing types are almost
10256 entirely lock-free.
10257 * extra: The `flatpipes` module had bitrotted and was removed.
10258 * extra: All crypto functions have been removed and Rust now has a policy of
10259 not reimplementing crypto in the standard library. In the future crypto
10260 will be provided by external crates with bindings to established libraries.
10261 * extra: `c_vec` has been modernized.
10262 * extra: The `sort` module has been removed. Use the `sort` method on
10266 * The `rust` and `rusti` commands have been removed, due to lack of
10268 * `rustdoc` was completely rewritten.
10269 * `rustdoc` can test code examples in documentation.
10270 * `rustpkg` can test packages with the argument, 'test'.
10271 * `rustpkg` supports arbitrary dependencies, including C libraries.
10272 * `rustc`'s support for generating debug info is improved again.
10273 * `rustc` has better error reporting for unbalanced delimiters.
10274 * `rustc`'s JIT support was removed due to bitrot.
10275 * Executables and static libraries can be built with LTO (-Z lto)
10276 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10280 Version 0.8 (2013-09-26)
10281 ============================
10283 * ~2200 changes, numerous bugfixes
10286 * The `for` loop syntax has changed to work with the `Iterator` trait.
10287 * At long last, unwinding works on Windows.
10288 * Default methods are ready for use.
10289 * Many trait inheritance bugs fixed.
10290 * Owned and borrowed trait objects work more reliably.
10291 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10292 * rustc can omit emission of code for the `debug!` macro if it is passed
10294 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10295 for foo.rs, then foo/mod.rs, and will generate an error when both are
10297 * Strings no longer contain trailing nulls. The new `std::c_str` module
10298 provides new mechanisms for converting to C strings.
10299 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10300 * The FFI has been overhauled such that foreign functions are called directly,
10301 instead of through a stack-switching wrapper.
10302 * Calling a foreign function must be done through a Rust function with the
10303 `#[fixed_stack_segment]` attribute.
10304 * The `externfn!` macro can be used to declare both a foreign function and
10305 a `#[fixed_stack_segment]` wrapper at once.
10306 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10307 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10308 * `priv` is disallowed everywhere except for struct fields and enum variants.
10309 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10310 * `ref` bindings in irrefutable patterns work correctly now.
10311 * `char` is now prevented from containing invalid code points.
10312 * Casting to `bool` is no longer allowed.
10313 * `\0` is now accepted as an escape in chars and strings.
10314 * `yield` is a reserved keyword.
10315 * `typeof` is a reserved keyword.
10316 * Crates may be imported by URL with `extern mod foo = "url";`.
10317 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10318 * Static vectors can be initialized with repeating elements,
10319 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10320 * Static structs can be initialized with functional record update,
10321 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10322 * `cfg!` can be used to conditionally execute code based on the crate
10323 configuration, similarly to `#[cfg(...)]`.
10324 * The `unnecessary_qualification` lint detects unneeded module
10325 prefixes (default: allow).
10326 * Arithmetic operations have been implemented on the SIMD types in
10327 `std::unstable::simd`.
10328 * Exchange allocation headers were removed, reducing memory usage.
10329 * `format!` implements a completely new, extensible, and higher-performance
10330 string formatting system. It will replace `fmt!`.
10331 * `print!` and `println!` write formatted strings (using the `format!`
10332 extension) to stdout.
10333 * `write!` and `writeln!` write formatted strings (using the `format!`
10334 extension) to the new Writers in `std::rt::io`.
10335 * The library section in which a function or static is placed may
10336 be specified with `#[link_section = "..."]`.
10337 * The `proto!` syntax extension for defining bounded message protocols
10339 * `macro_rules!` is hygienic for `let` declarations.
10340 * The `#[export_name]` attribute specifies the name of a symbol.
10341 * `unreachable!` can be used to indicate unreachable code, and fails
10345 * std: Transitioned to the new runtime, written in Rust.
10346 * std: Added an experimental I/O library, `rt::io`, based on the new
10348 * std: A new generic `range` function was added to the prelude, replacing
10349 `uint::range` and friends.
10350 * std: `range_rev` no longer exists. Since range is an iterator it can be
10351 reversed with `range(lo, hi).invert()`.
10352 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10353 renamed to `unwrap_or`.
10354 * std: The `iterator` module was renamed to `iter`.
10355 * std: Integral types now support the `checked_add`, `checked_sub`, and
10356 `checked_mul` operations for detecting overflow.
10357 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10359 * std: Methods are standardizing on conventions for casting methods:
10360 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10362 * std: The `CString` type in `c_str` provides new ways to convert to and
10364 * std: `DoubleEndedIterator` can yield elements in two directions.
10365 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10367 * std: `str::from_bytes` renamed to `str::from_utf8`.
10368 * std: `pop_opt` and `shift_opt` methods added to vectors.
10369 * std: The task-local data interface no longer uses @, and keys are
10370 no longer function pointers.
10371 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10372 * std: Added `SharedPort` to `comm`.
10373 * std: `Eq` has a default method for `ne`; only `eq` is required
10374 in implementations.
10375 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10376 is required in implementations.
10377 * std: `is_utf8` performance is improved, impacting many string functions.
10378 * std: `os::MemoryMap` provides cross-platform mmap.
10379 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10380 are not 'in-bounds' are considered undefined.
10381 * std: Many freestanding functions in `vec` removed in favor of methods.
10382 * std: Many freestanding functions on scalar types removed in favor of
10384 * std: Many options to task builders were removed since they don't make
10385 sense in the new scheduler design.
10386 * std: More containers implement `FromIterator` so can be created by the
10388 * std: More complete atomic types in `unstable::atomics`.
10389 * std: `comm::PortSet` removed.
10390 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10391 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10392 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10393 default implementations.
10394 * std: Various `from_str` functions were removed in favor of a generic
10395 `from_str` which is available in the prelude.
10396 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10397 * extra: `dlist`, the doubly-linked list was modernized.
10398 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10399 * extra: Added `glob` module, replacing `std::os::glob`.
10400 * extra: `rope` was removed.
10401 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10402 * extra: `net`, and `timer` were removed. The experimental replacements
10403 are `std::rt::io::net` and `std::rt::io::timer`.
10404 * extra: Iterators implemented for `SmallIntMap`.
10405 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10406 * extra: `SmallIntSet` removed. Use `BitvSet`.
10407 * extra: Performance of JSON parsing greatly improved.
10408 * extra: `semver` updated to SemVer 2.0.0.
10409 * extra: `term` handles more terminals correctly.
10410 * extra: `dbg` module removed.
10411 * extra: `par` module removed.
10412 * extra: `future` was cleaned up, with some method renames.
10413 * extra: Most free functions in `getopts` were converted to methods.
10416 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10417 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10418 similarly to gcc's `--march` flag.
10419 * rustc's performance compiling small crates is much better.
10420 * rustpkg has received many improvements.
10421 * rustpkg supports git tags as package IDs.
10422 * rustpkg builds into target-specific directories so it can be used for
10424 * The number of concurrent test tasks is controlled by the environment
10425 variable RUST_TEST_TASKS.
10426 * The test harness can now report metrics for benchmarks.
10427 * All tools have man pages.
10428 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10429 * The runtime uses jemalloc for allocations.
10430 * Segmented stacks are temporarily disabled as part of the transition to
10431 the new runtime. Stack overflows are possible!
10432 * A new documentation backend, rustdoc_ng, is available for use. It is
10433 still invoked through the normal `rustdoc` command.
10436 Version 0.7 (2013-07-03)
10437 =======================
10439 * ~2000 changes, numerous bugfixes
10442 * `impl`s no longer accept a visibility qualifier. Put them on methods
10444 * The borrow checker has been rewritten with flow-sensitivity, fixing
10445 many bugs and inconveniences.
10446 * The `self` parameter no longer implicitly means `&'self self`,
10447 and can be explicitly marked with a lifetime.
10448 * Overloadable compound operators (`+=`, etc.) have been temporarily
10449 removed due to bugs.
10450 * The `for` loop protocol now requires `for`-iterators to return `bool`
10451 so they compose better.
10452 * The `Durable` trait is replaced with the `'static` bounds.
10453 * Trait default methods work more often.
10454 * Structs with the `#[packed]` attribute have byte alignment and
10455 no padding between fields.
10456 * Type parameters bound by `Copy` must now be copied explicitly with
10457 the `copy` keyword.
10458 * It is now illegal to move out of a dereferenced unsafe pointer.
10459 * `Option<~T>` is now represented as a nullable pointer.
10460 * `@mut` does dynamic borrow checks correctly.
10461 * The `main` function is only detected at the topmost level of the crate.
10462 The `#[main]` attribute is still valid anywhere.
10463 * Struct fields may no longer be mutable. Use inherited mutability.
10464 * The `#[no_send]` attribute makes a type that would otherwise be
10466 * The `#[no_freeze]` attribute makes a type that would otherwise be
10468 * Unbounded recursion will abort the process after reaching the limit
10469 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10470 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10471 are never implicitly copyable.
10472 * `#[static_assert]` makes compile-time assertions about static bools.
10473 * At long last, 'argument modes' no longer exist.
10474 * The rarely used `use mod` statement no longer exists.
10476 * Syntax extensions
10477 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10479 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10480 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10481 `#[deriving(...)]`.
10482 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10483 and unsuffixed integer literals.
10486 * The `core` crate was renamed to `std`.
10487 * The `std` crate was renamed to `extra`.
10488 * More and improved documentation.
10489 * std: `iterator` module for external iterator objects.
10490 * Many old-style (internal, higher-order function) iterators replaced by
10491 implementations of `Iterator`.
10492 * std: Many old internal vector and string iterators,
10493 incl. `any`, `all`. removed.
10494 * std: The `finalize` method of `Drop` renamed to `drop`.
10495 * std: The `drop` method now takes `&mut self` instead of `&self`.
10496 * std: The prelude no longer re-exports any modules, only types and traits.
10497 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10498 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10499 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10500 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10501 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10502 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10503 * std: Many types implement `Clone`.
10504 * std: `path` type renamed to `Path`.
10505 * std: `mut` module and `Mut` type removed.
10506 * std: Many standalone functions removed in favor of methods and iterators
10507 in `vec`, `str`. In the future methods will also work as functions.
10508 * std: `reinterpret_cast` removed. Use `transmute`.
10509 * std: ascii string handling in `std::ascii`.
10510 * std: `Rand` is implemented for ~/@.
10511 * std: `run` module for spawning processes overhauled.
10512 * std: Various atomic types added to `unstable::atomic`.
10513 * std: Various types implement `Zero`.
10514 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10515 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10516 * std: Added `os::mkdir_recursive`.
10517 * std: Added `os::glob` function performs filesystems globs.
10518 * std: `FuzzyEq` renamed to `ApproxEq`.
10519 * std: `Map` now defines `pop` and `swap` methods.
10520 * std: `Cell` constructors converted to static methods.
10521 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10522 * extra: `flate` module moved from `std` to `extra`.
10523 * extra: `fileinput` module for iterating over a series of files.
10524 * extra: `Complex` number type and `complex` module.
10525 * extra: `Rational` number type and `rational` module.
10526 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10527 * extra: `term` uses terminfo now, is more correct.
10528 * extra: `arc` functions converted to methods.
10529 * extra: Implementation of fixed output size variations of SHA-2.
10532 * `unused_variables` lint mode for unused variables (default: warn).
10533 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10535 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10537 * `dead_assignment` lint mode for unread variables (default: warn).
10538 * `unnecessary_allocation` lint mode detects some heap allocations that are
10539 immediately borrowed so could be written without allocating (default: warn).
10540 * `missing_doc` lint mode (default: allow).
10541 * `unreachable_code` lint mode (default: warn).
10542 * The `rusti` command has been rewritten and a number of bugs addressed.
10543 * rustc outputs in color on more terminals.
10544 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10545 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10546 * Compiling with `-g` will make the binary record information about
10547 dynamic borrowcheck failures for debugging.
10548 * rustdoc has a nicer stylesheet.
10549 * Various improvements to rustdoc.
10550 * Improvements to rustpkg (see the detailed release notes).
10553 Version 0.6 (2013-04-03)
10554 ========================
10556 * ~2100 changes, numerous bugfixes
10559 * The self type parameter in traits is now spelled `Self`
10560 * The `self` parameter in trait and impl methods must now be explicitly
10561 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10562 * Static methods no longer require the `static` keyword and instead
10563 are distinguished by the lack of a `self` parameter
10564 * Replaced the `Durable` trait with the `'static` lifetime
10565 * The old closure type syntax with the trailing sigil has been
10566 removed in favor of the more consistent leading sigil
10567 * `super` is a keyword, and may be prefixed to paths
10568 * Trait bounds are separated with `+` instead of whitespace
10569 * Traits are implemented with `impl Trait for Type`
10570 instead of `impl Type: Trait`
10571 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10572 * The `export` keyword has finally been removed
10573 * The `move` keyword has been removed (see "Semantic changes")
10574 * The interior mutability qualifier on vectors, `[mut T]`, has been
10575 removed. Use `&mut [T]`, etc.
10576 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10577 * `fail` is no longer a keyword. Use `fail!()`
10578 * `assert` is no longer a keyword. Use `assert!()`
10579 * `log` is no longer a keyword. use `debug!`, etc.
10580 * 1-tuples may be represented as `(T,)`
10581 * Struct fields may no longer be `mut`. Use inherited mutability,
10582 `@mut T`, `core::mut` or `core::cell`
10583 * `extern mod { ... }` is no longer valid syntax for foreign
10584 function modules. Use extern blocks: `extern { ... }`
10585 * Newtype enums removed. Use tuple-structs.
10586 * Trait implementations no longer support visibility modifiers
10587 * Pattern matching over vectors improved and expanded
10588 * `const` renamed to `static` to correspond to lifetime name,
10589 and make room for future `static mut` unsafe mutable globals.
10590 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10591 * `Clone` implementations can be automatically generated with
10592 `#[deriving(Clone)]`
10593 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10594 instead of `foo as Bar`.
10595 * Fixed length vector types are now written as `[int, .. 3]`
10596 instead of `[int * 3]`.
10597 * Fixed length vector types can express the length as a constant
10598 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10601 * Types with owned pointers or custom destructors move by default,
10602 eliminating the `move` keyword
10603 * All foreign functions are considered unsafe
10604 * &mut is now unaliasable
10605 * Writes to borrowed @mut pointers are prevented dynamically
10607 * The name of the main function can be customized using #[main]
10608 * The default type of an inferred closure is &fn instead of @fn
10609 * `use` statements may no longer be "chained" - they cannot import
10610 identifiers imported by previous `use` statements
10611 * `use` statements are crate relative, importing from the "top"
10612 of the crate by default. Paths may be prefixed with `super::`
10613 or `self::` to change the search behavior.
10614 * Method visibility is inherited from the implementation declaration
10615 * Structural records have been removed
10616 * Many more types can be used in static items, including enums
10617 'static-lifetime pointers and vectors
10618 * Pattern matching over vectors improved and expanded
10619 * Typechecking of closure types has been overhauled to
10620 improve inference and eliminate unsoundness
10621 * Macros leave scope at the end of modules, unless that module is
10622 tagged with #[macro_escape]
10625 * Added big integers to `std::bigint`
10626 * Removed `core::oldcomm` module
10627 * Added pipe-based `core::comm` module
10628 * Numeric traits have been reorganized under `core::num`
10629 * `vec::slice` finally returns a slice
10630 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10631 * Containers reorganized around traits in `core::container`
10632 * `core::dvec` removed, `~[T]` is a drop-in replacement
10633 * `core::send_map` renamed to `core::hashmap`
10634 * `std::map` removed; replaced with `core::hashmap`
10635 * `std::treemap` reimplemented as an owned balanced tree
10636 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10637 * `core::trie` added as a fast ordered map for integer keys
10638 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10639 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10640 overload the comparison operators, whereas `TotalOrd` is used
10641 by certain container types
10644 * Replaced the 'cargo' package manager with 'rustpkg'
10645 * Added all-purpose 'rust' tool
10646 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10647 * rustc now *attempts* to offer spelling suggestions
10648 * Improved support for ARM and Android
10649 * Preliminary MIPS backend
10650 * Improved foreign function ABI implementation for x86, x86_64
10651 * Various memory usage improvements
10652 * Rust code may be embedded in foreign code under limited circumstances
10653 * Inline assembler supported by new asm!() syntax extension.
10656 Version 0.5 (2012-12-21)
10657 ===========================
10659 * ~900 changes, numerous bugfixes
10662 * Removed `<-` move operator
10663 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10664 * Removed old fixed length vector syntax - `[T]/N`
10665 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10666 * Macros may now expand to items and statements
10667 * `a.b()` is always parsed as a method call, never as a field projection
10668 * `Eq` and `IterBytes` implementations can be automatically generated
10669 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10670 * Removed the special crate language for `.rc` files
10671 * Function arguments may consist of any irrefutable pattern
10674 * `&` and `~` pointers may point to objects
10675 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10676 * Enum variants may be structs
10677 * Destructors can be added to all nominal types with the Drop trait
10678 * Structs and nullary enum variants may be constants
10679 * Values that cannot be implicitly copied are now automatically moved
10680 without writing `move` explicitly
10681 * `&T` may now be coerced to `*T`
10682 * Coercions happen in `let` statements as well as function calls
10683 * `use` statements now take crate-relative paths
10684 * The module and type namespaces have been merged so that static
10685 method names can be resolved under the trait in which they are
10688 * Improved support for language features
10689 * Trait inheritance works in many scenarios
10690 * More support for explicit self arguments in methods - `self`, `&self`
10691 `@self`, and `~self` all generally work as expected
10692 * Static methods work in more situations
10693 * Experimental: Traits may declare default methods for the implementations
10697 * New condition handling system in `core::condition`
10698 * Timsort added to `std::sort`
10699 * New priority queue, `std::priority_queue`
10700 * Pipes for serializable types, `std::flatpipes'
10701 * Serialization overhauled to be trait-based
10702 * Expanded `getopts` definitions
10703 * Moved futures to `std`
10704 * More functions are pure now
10705 * `core::comm` renamed to `oldcomm`. Still deprecated
10706 * `rustdoc` and `cargo` are libraries now
10709 * Added a preliminary REPL, `rusti`
10710 * License changed from MIT to dual MIT/APL2
10713 Version 0.4 (2012-10-15)
10714 ==========================
10716 * ~2000 changes, numerous bugfixes
10719 * All keywords are now strict and may not be used as identifiers anywhere
10720 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10721 'of', 'with', 'to', 'class'.
10722 * Classes are replaced with simpler structs
10723 * Explicit method self types
10724 * `ret` became `return` and `alt` became `match`
10725 * `import` is now `use`; `use is now `extern mod`
10726 * `extern mod { ... }` is now `extern { ... }`
10727 * `use mod` is the recommended way to import modules
10728 * `pub` and `priv` replace deprecated export lists
10729 * The syntax of `match` pattern arms now uses fat arrow (=>)
10730 * `main` no longer accepts an args vector; use `os::args` instead
10733 * Trait implementations are now coherent, ala Haskell typeclasses
10734 * Trait methods may be static
10735 * Argument modes are deprecated
10736 * Borrowed pointers are much more mature and recommended for use
10737 * Strings and vectors in the static region are stored in constant memory
10738 * Typestate was removed
10739 * Resolution rewritten to be more reliable
10740 * Support for 'dual-mode' data structures (freezing and thawing)
10743 * Most binary operators can now be overloaded via the traits in
10745 * `std::net::url` for representing URLs
10746 * Sendable hash maps in `core::send_map`
10747 * `core::task' gained a (currently unsafe) task-local storage API
10750 * An efficient new intertask communication primitive called the pipe,
10751 along with a number of higher-level channel types, in `core::pipes`
10752 * `std::arc`, an atomically reference counted, immutable, shared memory
10754 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10755 * Futures are now based on pipes and sendable
10756 * More robust linked task failure
10757 * Improved task builder API
10760 * Improved error reporting
10761 * Preliminary JIT support
10762 * Preliminary work on precise GC
10763 * Extensive architectural improvements to rustc
10764 * Begun a transition away from buggy C++-based reflection (shape) code to
10765 Rust-based (visitor) code
10766 * All hash functions and tables converted to secure, randomized SipHash
10769 Version 0.3 (2012-07-12)
10770 ========================
10772 * ~1900 changes, numerous bugfixes
10774 * New coding conveniences
10775 * Integer-literal suffix inference
10776 * Per-item control over warnings, errors
10777 * #[cfg(windows)] and #[cfg(unix)] attributes
10778 * Documentation comments
10779 * More compact closure syntax
10780 * 'do' expressions for treating higher-order functions as
10782 * *-patterns (wildcard extended to all constructor fields)
10785 * Name resolution pass and exhaustiveness checker rewritten
10786 * Region pointers and borrow checking supersede alias
10788 * Init-ness checking is now provided by a region-based liveness
10789 pass instead of the typestate pass; same for last-use analysis
10790 * Extensive work on region pointers
10792 * Experimental new language features
10793 * Slices and fixed-size, interior-allocated vectors
10794 * #!-comments for lang versioning, shell execution
10795 * Destructors and iface implementation for classes;
10796 type-parameterized classes and class methods
10797 * 'const' type kind for types that can be used to implement
10798 shared-memory concurrency patterns
10802 * Removal of various obsolete features
10803 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10804 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10806 * Constructs: do-while loops ('do' repurposed), fn binding,
10807 resources (replaced by destructors)
10809 * Compiler reorganization
10810 * Syntax-layer of compiler split into separate crate
10811 * Clang (from LLVM project) integrated into build
10812 * Typechecker split into sub-modules
10815 * New time functions
10816 * Extension methods for many built-in types
10817 * Arc: atomic-refcount read-only / exclusive-use shared cells
10818 * Par: parallel map and search routines
10819 * Extensive work on libuv interface
10820 * Much vector code moved to libraries
10821 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10822 #include, #include_str, #include_bin
10824 * Tool improvements
10825 * Cargo automatically resolves dependencies
10828 Version 0.2 (2012-03-29)
10829 =========================
10831 * >1500 changes, numerous bugfixes
10833 * New docs and doc tooling
10835 * New port: FreeBSD x86_64
10837 * Compilation model enhancements
10838 * Generics now specialized, multiply instantiated
10839 * Functions now inlined across separate crates
10841 * Scheduling, stack and threading fixes
10842 * Noticeably improved message-passing performance
10843 * Explicit schedulers
10847 * Experimental new language features
10848 * Operator overloading
10852 * Various language extensions
10853 * C-callback function types: 'crust fn ...'
10854 * Infinite-loop construct: 'loop { ... }'
10855 * Shorten 'mutable' to 'mut'
10856 * Required mutable-local qualifier: 'let mut ...'
10857 * Basic glob-exporting: 'export foo::*;'
10858 * Alt now exhaustive, 'alt check' for runtime-checked
10859 * Block-function form of 'for' loop, with 'break' and 'ret'.
10862 * AST quasi-quote syntax extension
10863 * Revived libuv interface
10864 * New modules: core::{future, iter}, std::arena
10865 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10866 * Extensive cleanup, regularization in libstd, libcore
10869 Version 0.1 (2012-01-20)
10870 ===============================
10872 * Most language features work, including:
10873 * Unique pointers, unique closures, move semantics
10874 * Interface-constrained generics
10875 * Static interface dispatch
10877 * Multithread task scheduling
10878 * Typestate predicates
10879 * Failure unwinding, destructors
10880 * Pattern matching and destructuring assignment
10881 * Lightweight block-lambda syntax
10882 * Preliminary macro-by-example
10884 * Compiler works with the following configurations:
10885 * Linux: x86 and x86_64 hosts and targets
10886 * macOS: x86 and x86_64 hosts and targets
10887 * Windows: x86 hosts and targets
10889 * Cross compilation / multi-target configuration supported.
10891 * Preliminary API-documentation and package-management tools included.
10895 * Documentation is incomplete.
10897 * Performance is below intended target.
10899 * Standard library APIs are subject to extensive change, reorganization.
10901 * Language-level versioning is not yet operational - future code will
10902 break unexpectedly.