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 - [Rust now uses the official cross compiler for NetBSD][40612]
5759 - [rustdoc now accepts `#` at the start of files][40828]
5760 - [Fixed jemalloc support for musl][41168]
5765 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5766 always placed after the sign if it exists and before the digits. With the `#`
5767 flag the zeroes are placed after the prefix and before the digits.
5768 - [Due to the struct field optimisation][40377], using `transmute` on structs
5769 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5770 always been undefined behavior, but is now more likely to break in practice.
5771 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5772 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5773 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5774 - [Overlapping inherent `impl`s are now a hard error][40728]
5775 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5776 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5777 `out.asm` and `out.ll` instead of only one of the filetypes.
5778 - [ calling a function that returns `Self` will no longer work][41805] when
5779 the size of `Self` cannot be statically determined.
5780 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5781 this has caused a few regressions namely:
5783 - Changed the link order of local static/dynamic libraries (respecting the
5784 order on given rather than having the compiler reorder).
5785 - Changed how MinGW is linked, native code linked to dynamic libraries
5786 may require manually linking to the gcc support library (for the native
5789 [38165]: https://github.com/rust-lang/rust/pull/38165
5790 [39799]: https://github.com/rust-lang/rust/pull/39799
5791 [39891]: https://github.com/rust-lang/rust/pull/39891
5792 [40043]: https://github.com/rust-lang/rust/pull/40043
5793 [40241]: https://github.com/rust-lang/rust/pull/40241
5794 [40338]: https://github.com/rust-lang/rust/pull/40338
5795 [40367]: https://github.com/rust-lang/rust/pull/40367
5796 [40377]: https://github.com/rust-lang/rust/pull/40377
5797 [40409]: https://github.com/rust-lang/rust/pull/40409
5798 [40516]: https://github.com/rust-lang/rust/pull/40516
5799 [40556]: https://github.com/rust-lang/rust/pull/40556
5800 [40561]: https://github.com/rust-lang/rust/pull/40561
5801 [40589]: https://github.com/rust-lang/rust/pull/40589
5802 [40612]: https://github.com/rust-lang/rust/pull/40612
5803 [40723]: https://github.com/rust-lang/rust/pull/40723
5804 [40728]: https://github.com/rust-lang/rust/pull/40728
5805 [40731]: https://github.com/rust-lang/rust/pull/40731
5806 [40734]: https://github.com/rust-lang/rust/pull/40734
5807 [40805]: https://github.com/rust-lang/rust/pull/40805
5808 [40807]: https://github.com/rust-lang/rust/pull/40807
5809 [40828]: https://github.com/rust-lang/rust/pull/40828
5810 [40870]: https://github.com/rust-lang/rust/pull/40870
5811 [41085]: https://github.com/rust-lang/rust/pull/41085
5812 [41143]: https://github.com/rust-lang/rust/pull/41143
5813 [41168]: https://github.com/rust-lang/rust/pull/41168
5814 [41270]: https://github.com/rust-lang/rust/issues/41270
5815 [41469]: https://github.com/rust-lang/rust/pull/41469
5816 [41805]: https://github.com/rust-lang/rust/issues/41805
5817 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
5818 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
5819 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
5820 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
5821 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
5822 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
5823 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
5824 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
5825 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
5826 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
5827 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
5828 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
5829 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
5830 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
5833 Version 1.17.0 (2017-04-27)
5834 ===========================
5839 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
5840 * [Fields of structs may be initialized without duplicating the field/variable
5841 names][39761]. [RFC 1682]
5842 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
5843 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5844 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
5845 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
5846 `'b`. Soundness fix.
5847 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
5848 * [Static variables may contain references to other statics][40027]
5853 * [Exit quickly on only `--emit dep-info`][40336]
5854 * [Make `-C relocation-model` more correctly determine whether the linker
5855 creates a position-independent executable][40245]
5856 * [Add `-C overflow-checks` to directly control whether integer overflow
5858 * [The rustc type checker now checks items on demand instead of in a single
5859 in-order pass][40008]. This is mostly an internal refactoring in support of
5860 future work, including incremental type checking, but also resolves [RFC
5861 1647], allowing `Self` to appear in `impl` `where` clauses.
5862 * [Optimize vtable loads][39995]
5863 * [Turn off vectorization for Emscripten targets][39990]
5864 * [Provide suggestions for unknown macros imported with `use`][39953]
5865 * [Fix ICEs in path resolution][39939]
5866 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
5867 * [Add clearer error message using `&str + &str`][39116]
5878 * [`Ordering::then`]
5879 * [`Ordering::then_with`]
5880 * [`BTreeMap::range`]
5881 * [`BTreeMap::range_mut`]
5882 * [`collections::Bound`]
5883 * [`process::abort`]
5884 * [`ptr::read_unaligned`]
5885 * [`ptr::write_unaligned`]
5886 * [`Result::expect_err`]
5889 * [`Cell::into_inner`]
5895 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
5896 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
5897 * [`String` implements `FromIterator<&char>`][40028]
5898 * `Box` [implements][40009] a number of new conversions:
5899 `From<Box<str>> for String`,
5900 `From<Box<[T]>> for Vec<T>`,
5901 `From<Box<CStr>> for CString`,
5902 `From<Box<OsStr>> for OsString`,
5903 `From<Box<Path>> for PathBuf`,
5904 `Into<Box<str>> for String`,
5905 `Into<Box<[T]>> for Vec<T>`,
5906 `Into<Box<CStr>> for CString`,
5907 `Into<Box<OsStr>> for OsString`,
5908 `Into<Box<Path>> for PathBuf`,
5909 `Default for Box<str>`,
5910 `Default for Box<CStr>`,
5911 `Default for Box<OsStr>`,
5912 `From<&CStr> for Box<CStr>`,
5913 `From<&OsStr> for Box<OsStr>`,
5914 `From<&Path> for Box<Path>`
5915 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
5916 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
5917 * [Slightly optimize `slice::sort`][39538]
5918 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
5919 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
5920 `Box<str>` implements `From<&str>`][39438]
5921 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
5922 `From<(I, u16)> where I: Into<IpAddr>`][39372]
5923 * [`format!` estimates the needed capacity before writing a string][39356]
5924 * [Support unprivileged symlink creation in Windows][38921]
5925 * [`PathBuf` implements `Default`][38764]
5926 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
5927 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
5928 and poor hash functions.
5933 * [Add `cargo check --all`][cargo/3731]
5934 * [Add an option to ignore SSL revocation checking][cargo/3699]
5935 * [Add `cargo run --package`][cargo/3691]
5936 * [Add `required_features`][cargo/3667]
5937 * [Assume `build.rs` is a build script][cargo/3664]
5938 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
5943 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
5945 * [The "Unstable Book" documents nightly-only features][ubook]
5946 * [Improve the style of the sidebar in rustdoc output][40265]
5947 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
5948 * [Fix MSP430 breakage due to `i128`][40257]
5949 * [Preliminary Solaris/SPARCv9 support][39903]
5950 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
5951 run without installing the MSVC runtime.
5952 * [`rustdoc --test` includes file names in test names][39788]
5953 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
5954 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
5955 * [Initial support for `aarch64-unknown-freebsd`][39491]
5956 * [Initial support for `i686-unknown-netbsd`][39426]
5957 * [This release no longer includes the old makefile build system][39431]. Rust
5958 is built with a custom build system, written in Rust, and with Cargo.
5959 * [Add Debug implementations for libcollection structs][39002]
5960 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
5961 * [`--test-threads=0` produces an error][38945]
5962 * [`rustup` installs documentation by default][40526]
5963 * [The Rust source includes NatVis visualizations][39843]. These can be used by
5964 WinDbg and Visual Studio to improve the debugging experience.
5969 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
5970 workaround, either use MSVC 2015 or run vcvars.bat.
5971 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
5972 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
5973 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
5975 * [`format!` and `Display::to_string` panic if an underlying formatting
5976 implementation returns an error][40117]. Previously the error was silently
5977 ignored. It is incorrect for `write_fmt` to return an error when writing
5979 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
5980 crates were marked stable and could be accessed from the stable toolchain.
5981 * [Rust git source no longer includes vendored crates][39728]. Those that need
5982 to build with vendored crates should build from release tarballs.
5983 * [Fix inert attributes from `proc_macro_derives`][39572]
5984 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
5985 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
5987 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
5988 existing code generally ignores the type of dead-code unless a type-hint is
5989 provided; this can cause surprising inference interactions particularly around
5990 defaulting. The new code uniformly ignores the result type of dead-code.
5991 * [Tuple-struct constructors with private fields are no longer visible][38932]
5992 * [Lifetime parameters that do not appear in the arguments are now considered
5993 early-bound][38897], resolving a soundness bug (#[32330]). The
5994 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
5996 * [rustdoc: fix doctests with non-feature crate attributes][38161]
5997 * [Make transmuting from fn item types to pointer-sized types a hard
6000 [27787]: https://github.com/rust-lang/rust/issues/27787
6001 [32330]: https://github.com/rust-lang/rust/issues/32330
6002 [34198]: https://github.com/rust-lang/rust/pull/34198
6003 [38161]: https://github.com/rust-lang/rust/pull/38161
6004 [38368]: https://github.com/rust-lang/rust/pull/38368
6005 [38584]: https://github.com/rust-lang/rust/issues/38584
6006 [38661]: https://github.com/rust-lang/rust/pull/38661
6007 [38764]: https://github.com/rust-lang/rust/pull/38764
6008 [38864]: https://github.com/rust-lang/rust/issues/38864
6009 [38897]: https://github.com/rust-lang/rust/pull/38897
6010 [38921]: https://github.com/rust-lang/rust/pull/38921
6011 [38932]: https://github.com/rust-lang/rust/pull/38932
6012 [38945]: https://github.com/rust-lang/rust/pull/38945
6013 [38981]: https://github.com/rust-lang/rust/pull/38981
6014 [39002]: https://github.com/rust-lang/rust/pull/39002
6015 [39116]: https://github.com/rust-lang/rust/pull/39116
6016 [39193]: https://github.com/rust-lang/rust/pull/39193
6017 [39265]: https://github.com/rust-lang/rust/pull/39265
6018 [39356]: https://github.com/rust-lang/rust/pull/39356
6019 [39372]: https://github.com/rust-lang/rust/pull/39372
6020 [39426]: https://github.com/rust-lang/rust/pull/39426
6021 [39431]: https://github.com/rust-lang/rust/pull/39431
6022 [39438]: https://github.com/rust-lang/rust/pull/39438
6023 [39440]: https://github.com/rust-lang/rust/pull/39440
6024 [39485]: https://github.com/rust-lang/rust/pull/39485
6025 [39491]: https://github.com/rust-lang/rust/pull/39491
6026 [39518]: https://github.com/rust-lang/rust/pull/39518
6027 [39538]: https://github.com/rust-lang/rust/pull/39538
6028 [39572]: https://github.com/rust-lang/rust/pull/39572
6029 [39633]: https://github.com/rust-lang/rust/pull/39633
6030 [39642]: https://github.com/rust-lang/rust/pull/39642
6031 [39728]: https://github.com/rust-lang/rust/pull/39728
6032 [39761]: https://github.com/rust-lang/rust/pull/39761
6033 [39788]: https://github.com/rust-lang/rust/pull/39788
6034 [39793]: https://github.com/rust-lang/rust/pull/39793
6035 [39837]: https://github.com/rust-lang/rust/pull/39837
6036 [39843]: https://github.com/rust-lang/rust/pull/39843
6037 [39851]: https://github.com/rust-lang/rust/pull/39851
6038 [39903]: https://github.com/rust-lang/rust/pull/39903
6039 [39939]: https://github.com/rust-lang/rust/pull/39939
6040 [39953]: https://github.com/rust-lang/rust/pull/39953
6041 [39960]: https://github.com/rust-lang/rust/pull/39960
6042 [39990]: https://github.com/rust-lang/rust/pull/39990
6043 [39995]: https://github.com/rust-lang/rust/pull/39995
6044 [40008]: https://github.com/rust-lang/rust/pull/40008
6045 [40009]: https://github.com/rust-lang/rust/pull/40009
6046 [40027]: https://github.com/rust-lang/rust/pull/40027
6047 [40028]: https://github.com/rust-lang/rust/pull/40028
6048 [40037]: https://github.com/rust-lang/rust/pull/40037
6049 [40117]: https://github.com/rust-lang/rust/pull/40117
6050 [40166]: https://github.com/rust-lang/rust/pull/40166
6051 [40245]: https://github.com/rust-lang/rust/pull/40245
6052 [40257]: https://github.com/rust-lang/rust/pull/40257
6053 [40261]: https://github.com/rust-lang/rust/pull/40261
6054 [40265]: https://github.com/rust-lang/rust/pull/40265
6055 [40319]: https://github.com/rust-lang/rust/pull/40319
6056 [40336]: https://github.com/rust-lang/rust/pull/40336
6057 [40526]: https://github.com/rust-lang/rust/pull/40526
6058 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6059 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6060 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6061 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6062 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6063 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6064 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6065 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6066 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6067 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6068 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6069 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6070 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6071 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6072 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6073 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6074 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6075 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6076 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6077 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6078 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6079 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6080 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6081 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6082 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6083 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6084 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6085 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6086 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6087 [ubook]: https://doc.rust-lang.org/unstable-book/
6090 Version 1.16.0 (2017-03-16)
6091 ===========================
6096 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6097 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6098 match patterns][38069]
6099 * [Clean up semantics of `self` in an import list][38313]
6100 * [`Self` may appear in `impl` headers][38920]
6101 * [`Self` may appear in struct expressions][39282]
6106 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6107 a `.rmeta` file containing only crate metadata][38571]. This can be
6108 used by tools like the Rust Language Service to perform
6109 metadata-only builds.
6110 * [Levenshtein based typo suggestions now work in most places, while
6111 previously they worked only for fields and sometimes for local
6112 variables][38927]. Together with the overhaul of "no
6113 resolution"/"unexpected resolution" errors (#[38154]) they result in
6114 large and systematic improvement in resolution diagnostics.
6115 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6117 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6118 * [`rustc` no longer attempts to provide "consider using an explicit
6119 lifetime" suggestions][37057]. They were inaccurate.
6124 * [`VecDeque::truncate`]
6125 * [`VecDeque::resize`]
6126 * [`String::insert_str`]
6127 * [`Duration::checked_add`]
6128 * [`Duration::checked_sub`]
6129 * [`Duration::checked_div`]
6130 * [`Duration::checked_mul`]
6133 * [`SocketAddr::is_ipv4`]
6134 * [`SocketAddr::is_ipv6`]
6135 * [`IpAddr::is_ipv4`]
6136 * [`IpAddr::is_ipv6`]
6138 * [`Vec::dedup_by_key`]
6139 * [`Result::unwrap_or_default`]
6140 * [`<*const T>::wrapping_offset`]
6141 * [`<*mut T>::wrapping_offset`]
6142 * `CommandExt::creation_flags`
6143 * [`File::set_permissions`]
6144 * [`String::split_off`]
6149 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6150 their argument by `Borrow` parameter][37761]
6151 * [All public types in std implement `Debug`][38006]
6152 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6153 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6154 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6156 * [std: Fix partial writes in `LineWriter`][38062]
6157 * [std: Clamp max read/write sizes on Unix][38622]
6158 * [Use more specific panic message for `&str` slicing errors][38066]
6159 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6160 functionality cannot be achieved in std currently.
6161 * [`writeln!`, like `println!`, now accepts a form with no string
6162 or formatting arguments, to just print a newline][38469]
6163 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6164 * [Reduce the size of static data in `std_unicode::tables`][38781]
6165 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6166 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6168 * [`Duration` implements `Sum`][38712]
6169 * [`String` implements `ToSocketAddrs`][39048]
6174 * [The `cargo check` command does a type check of a project without
6175 building it][cargo/3296]
6176 * [crates.io will display CI badges from Travis and AppVeyor, if
6177 specified in Cargo.toml][cargo/3546]
6178 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6179 * [Compilation profiles accept integer values for `debug`, in addition
6180 to `true` and `false`. These are passed to `rustc` as the value to
6181 `-C debuginfo`][cargo/3534]
6182 * [Implement `cargo --version --verbose`][cargo/3604]
6183 * [All builds now output 'dep-info' build dependencies compatible with
6184 make and ninja][cargo/3557]
6185 * [Build all workspace members with `build --all`][cargo/3511]
6186 * [Document all workspace members with `doc --all`][cargo/3515]
6187 * [Path deps outside workspace are not members][cargo/3443]
6192 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6193 the path to the Rust implementation][38589]
6194 * [The `armv7-linux-androideabi` target no longer enables NEON
6195 extensions, per Google's ABI guide][38413]
6196 * [The stock standard library can be compiled for Redox OS][38401]
6197 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6199 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6201 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6206 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6207 match patterns][38069]
6208 * In this release, references to uninhabited types can not be
6209 pattern-matched. This was accidentally allowed in 1.15.
6210 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6211 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6213 * [Clean up semantics of `self` in an import list][38313]
6214 * Reimplemented lifetime elision. This change was almost entirely compatible
6215 with existing code, but it did close a number of small bugs and loopholes,
6216 as well as being more accepting in some other [cases][41105].
6218 [37057]: https://github.com/rust-lang/rust/pull/37057
6219 [37761]: https://github.com/rust-lang/rust/pull/37761
6220 [38006]: https://github.com/rust-lang/rust/pull/38006
6221 [38051]: https://github.com/rust-lang/rust/pull/38051
6222 [38062]: https://github.com/rust-lang/rust/pull/38062
6223 [38622]: https://github.com/rust-lang/rust/pull/38622
6224 [38066]: https://github.com/rust-lang/rust/pull/38066
6225 [38069]: https://github.com/rust-lang/rust/pull/38069
6226 [38131]: https://github.com/rust-lang/rust/pull/38131
6227 [38154]: https://github.com/rust-lang/rust/pull/38154
6228 [38274]: https://github.com/rust-lang/rust/pull/38274
6229 [38304]: https://github.com/rust-lang/rust/pull/38304
6230 [38313]: https://github.com/rust-lang/rust/pull/38313
6231 [38327]: https://github.com/rust-lang/rust/pull/38327
6232 [38401]: https://github.com/rust-lang/rust/pull/38401
6233 [38413]: https://github.com/rust-lang/rust/pull/38413
6234 [38469]: https://github.com/rust-lang/rust/pull/38469
6235 [38559]: https://github.com/rust-lang/rust/pull/38559
6236 [38571]: https://github.com/rust-lang/rust/pull/38571
6237 [38580]: https://github.com/rust-lang/rust/pull/38580
6238 [38589]: https://github.com/rust-lang/rust/pull/38589
6239 [38670]: https://github.com/rust-lang/rust/pull/38670
6240 [38712]: https://github.com/rust-lang/rust/pull/38712
6241 [38726]: https://github.com/rust-lang/rust/pull/38726
6242 [38781]: https://github.com/rust-lang/rust/pull/38781
6243 [38798]: https://github.com/rust-lang/rust/pull/38798
6244 [38909]: https://github.com/rust-lang/rust/pull/38909
6245 [38920]: https://github.com/rust-lang/rust/pull/38920
6246 [38927]: https://github.com/rust-lang/rust/pull/38927
6247 [39048]: https://github.com/rust-lang/rust/pull/39048
6248 [39282]: https://github.com/rust-lang/rust/pull/39282
6249 [39379]: https://github.com/rust-lang/rust/pull/39379
6250 [41105]: https://github.com/rust-lang/rust/issues/41105
6251 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6252 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6253 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6254 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6255 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6256 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6257 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6258 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6259 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6260 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6261 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6262 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6263 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6264 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6265 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6266 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6267 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6268 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6269 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6270 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6271 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6272 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6273 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6274 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6275 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6276 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6277 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6278 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6279 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6282 Version 1.15.1 (2017-02-09)
6283 ===========================
6285 * [Fix IntoIter::as_mut_slice's signature][39466]
6286 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6288 [39466]: https://github.com/rust-lang/rust/pull/39466
6289 [39523]: https://github.com/rust-lang/rust/pull/39523
6292 Version 1.15.0 (2017-02-02)
6293 ===========================
6298 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6299 stable. This allows popular code-generating crates like Serde and Diesel to
6300 work ergonomically. [RFC 1681].
6301 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6302 with curly braces][36868]. Part of [RFC 1506].
6303 * [A number of minor changes to name resolution have been activated][37127].
6304 They add up to more consistent semantics, allowing for future evolution of
6305 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6306 details of what is different. The breaking changes here have been transitioned
6307 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6308 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6310 * [`?Sized` can be used in `where` clauses][37791]
6311 * [There is now a limit on the size of monomorphized types and it can be
6312 modified with the `#![type_size_limit]` crate attribute, similarly to
6313 the `#![recursion_limit]` attribute][37789]
6318 * [On Windows, the compiler will apply dllimport attributes when linking to
6319 extern functions][37973]. Additional attributes and flags can control which
6320 library kind is linked and its name. [RFC 1717].
6321 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6322 * [The `--test` flag works with procedural macro crates][38107]
6323 * [Fix `extern "aapcs" fn` ABI][37814]
6324 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6325 * [The `format!` expander recognizes incorrect `printf` and shell-style
6326 formatting directives and suggests the correct format][37613].
6327 * [Only report one error for all unused imports in an import list][37456]
6329 Compiler Performance
6330 --------------------
6332 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6333 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6334 * [Don't clone in `UnificationTable::probe`][37848]
6335 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6336 * [Use small vectors in type walker][37760]
6337 * [Macro expansion performance was improved][37701]
6338 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6339 * [Replace FNV with a faster hash function][37229]
6344 * [`std::iter::Iterator::min_by`]
6345 * [`std::iter::Iterator::max_by`]
6346 * [`std::os::*::fs::FileExt`]
6347 * [`std::sync::atomic::Atomic*::get_mut`]
6348 * [`std::sync::atomic::Atomic*::into_inner`]
6349 * [`std::vec::IntoIter::as_slice`]
6350 * [`std::vec::IntoIter::as_mut_slice`]
6351 * [`std::sync::mpsc::Receiver::try_iter`]
6352 * [`std::os::unix::process::CommandExt::before_exec`]
6353 * [`std::rc::Rc::strong_count`]
6354 * [`std::rc::Rc::weak_count`]
6355 * [`std::sync::Arc::strong_count`]
6356 * [`std::sync::Arc::weak_count`]
6357 * [`std::char::encode_utf8`]
6358 * [`std::char::encode_utf16`]
6359 * [`std::cell::Ref::clone`]
6360 * [`std::io::Take::into_inner`]
6365 * [The standard sorting algorithm has been rewritten for dramatic performance
6366 improvements][38192]. It is a hybrid merge sort, drawing influences from
6367 Timsort. Previously it was a naive merge sort.
6368 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6369 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6371 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6372 and `char_indices().last()`][37882]
6373 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6374 * [Chinese characters display correctly in `fmt::Debug`][37855]
6375 * [Derive `Default` for `Duration`][37699]
6376 * [Support creation of anonymous pipes on WinXP/2k][37677]
6377 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6378 * [Don't pass overlapped handles to processes][38835]
6383 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6384 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6385 should instead check the variable at runtime with `std::env`. That the value
6386 was set at build time was a bug, and incorrect when cross-compiling. This
6387 change is known to cause breakage.
6388 * [Add `--all` flag to `cargo test`][cargo/3221]
6389 * [Compile statically against the MSVC CRT][cargo/3363]
6390 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6391 * [Link OpenSSL statically on OSX][cargo/3311]
6392 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6393 * [Test for bad path overrides with summaries][cargo/3336]
6394 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6395 * [Fix retrying crate downloads for network errors][cargo/3348]
6396 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6397 * [Emit more info on --message-format=json][cargo/3319]
6398 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6399 * [Don't ignore errors in workspace manifest][cargo/3409]
6400 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6405 * [Test runners (binaries built with `--test`) now support a `--list` argument
6406 that lists the tests it contains][38185]
6407 * [Test runners now support a `--exact` argument that makes the test filter
6408 match exactly, instead of matching only a substring of the test name][38181]
6409 * [rustdoc supports a `--playground-url` flag][37763]
6410 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6415 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6416 continue to be used in this release by passing `--disable-rustbuild` to the
6417 configure script, but they will be deleted soon. Note that the new build
6418 system uses a different on-disk layout that will likely affect any scripts
6420 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6422 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6423 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6429 * [A number of minor changes to name resolution have been activated][37127].
6430 They add up to more consistent semantics, allowing for future evolution of
6431 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6432 details of what is different. The breaking changes here have been transitioned
6433 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6434 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6435 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6436 should instead check the variable at runtime with `std::env`. That the value
6437 was set at build time was a bug, and incorrect when cross-compiling. This
6438 change is known to cause breakage.
6439 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6440 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6441 1.10 and is now an error by default. It will become a hard error in the near
6443 * [The semantics relating modules to file system directories are changing in
6444 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6445 lint, which is a warning in this release, and will become a hard error in the
6447 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6448 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6449 the underlying iterator][37834]
6451 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6452 [33685]: https://github.com/rust-lang/rust/issues/33685
6453 [36868]: https://github.com/rust-lang/rust/pull/36868
6454 [37127]: https://github.com/rust-lang/rust/pull/37127
6455 [37229]: https://github.com/rust-lang/rust/pull/37229
6456 [37456]: https://github.com/rust-lang/rust/pull/37456
6457 [37527]: https://github.com/rust-lang/rust/pull/37527
6458 [37602]: https://github.com/rust-lang/rust/pull/37602
6459 [37613]: https://github.com/rust-lang/rust/pull/37613
6460 [37615]: https://github.com/rust-lang/rust/pull/37615
6461 [37636]: https://github.com/rust-lang/rust/pull/37636
6462 [37627]: https://github.com/rust-lang/rust/pull/37627
6463 [37642]: https://github.com/rust-lang/rust/pull/37642
6464 [37677]: https://github.com/rust-lang/rust/pull/37677
6465 [37699]: https://github.com/rust-lang/rust/pull/37699
6466 [37701]: https://github.com/rust-lang/rust/pull/37701
6467 [37705]: https://github.com/rust-lang/rust/pull/37705
6468 [37749]: https://github.com/rust-lang/rust/pull/37749
6469 [37760]: https://github.com/rust-lang/rust/pull/37760
6470 [37763]: https://github.com/rust-lang/rust/pull/37763
6471 [37764]: https://github.com/rust-lang/rust/pull/37764
6472 [37789]: https://github.com/rust-lang/rust/pull/37789
6473 [37791]: https://github.com/rust-lang/rust/pull/37791
6474 [37814]: https://github.com/rust-lang/rust/pull/37814
6475 [37817]: https://github.com/rust-lang/rust/pull/37817
6476 [37834]: https://github.com/rust-lang/rust/pull/37834
6477 [37848]: https://github.com/rust-lang/rust/pull/37848
6478 [37855]: https://github.com/rust-lang/rust/pull/37855
6479 [37882]: https://github.com/rust-lang/rust/pull/37882
6480 [37888]: https://github.com/rust-lang/rust/pull/37888
6481 [37973]: https://github.com/rust-lang/rust/pull/37973
6482 [37979]: https://github.com/rust-lang/rust/pull/37979
6483 [38086]: https://github.com/rust-lang/rust/pull/38086
6484 [38107]: https://github.com/rust-lang/rust/pull/38107
6485 [38117]: https://github.com/rust-lang/rust/pull/38117
6486 [38134]: https://github.com/rust-lang/rust/pull/38134
6487 [38146]: https://github.com/rust-lang/rust/pull/38146
6488 [38181]: https://github.com/rust-lang/rust/pull/38181
6489 [38182]: https://github.com/rust-lang/rust/pull/38182
6490 [38185]: https://github.com/rust-lang/rust/pull/38185
6491 [38192]: https://github.com/rust-lang/rust/pull/38192
6492 [38279]: https://github.com/rust-lang/rust/pull/38279
6493 [38835]: https://github.com/rust-lang/rust/pull/38835
6494 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6495 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6496 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6497 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6498 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6499 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6500 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6501 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6502 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6503 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6504 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6505 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6506 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6507 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6508 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6509 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6510 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6511 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6512 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6513 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6514 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6515 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6516 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6517 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6518 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6519 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6520 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6521 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6522 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6523 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6524 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6525 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6526 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6527 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6528 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6529 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6530 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6533 Version 1.14.0 (2016-12-22)
6534 ===========================
6539 * [`..` matches multiple tuple fields in enum variants, structs
6540 and tuples][36843]. [RFC 1492].
6541 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6542 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6543 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6544 dereferencing][36822]
6549 * [Mark enums with non-zero discriminant as non-zero][37224]
6550 * [Lower-case `static mut` names are linted like other
6551 statics and consts][37162]
6552 * [Fix ICE on some macros in const integer positions
6553 (e.g. `[u8; m!()]`)][36819]
6554 * [Improve error message and snippet for "did you mean `x`"][36798]
6555 * [Add a panic-strategy field to the target specification][36794]
6556 * [Include LLVM version in `--version --verbose`][37200]
6558 Compile-time Optimizations
6559 --------------------------
6561 * [Improve macro expansion performance][37569]
6562 * [Shrink `Expr_::ExprInlineAsm`][37445]
6563 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6564 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6565 * [Avoid more allocations when compiling html5ever][37373]
6566 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6567 * [Avoid some allocations in the macro parser][37318]
6568 * [Use a faster deflate setting][37298]
6569 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6570 during interning of slices][37270]
6571 * [Optimize `write_metadata`][37267]
6572 * [Don't process obligation forest cycles when stalled][37231]
6573 * [Avoid many `CrateConfig` clones][37161]
6574 * [Optimize `Substs::super_fold_with`][37108]
6575 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6576 * [Speed up `plug_leaks`][36917]
6581 * [`println!()`, with no arguments, prints newline][36825].
6582 Previously, an empty string was required to achieve the same.
6583 * [`Wrapping` impls standard binary and unary operators, as well as
6584 the `Sum` and `Product` iterators][37356]
6585 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6587 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6588 `VecDeque` iterators][37315]
6589 * [Improve `SipHasher` performance on small values][37312]
6590 * [Add Iterator trait TrustedLen to enable better FromIterator /
6592 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6593 * [`ReadDir` implements `Debug`][37221]
6594 * [Implement `RefUnwindSafe` for atomic types][37178]
6595 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6596 * [Avoid allocations in `Decoder::read_str`][37064]
6597 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6598 * [Impl `Debug` for raw pointers to unsized data][36880]
6599 * [Don't reuse `HashMap` random seeds][37470]
6600 * [The internal memory layout of `HashMap` is more cache-friendly, for
6601 significant improvements in some operations][36692]
6602 * [`HashMap` uses less memory on 32-bit architectures][36595]
6603 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6608 * [Expose rustc cfg values to build scripts][cargo/3243]
6609 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6610 * [Fix passing --features when testing multiple packages][cargo/3280]
6611 * [Use a single profile set per workspace][cargo/3249]
6612 * [Load `replace` sections from lock files][cargo/3220]
6613 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6618 * [rustup is the recommended Rust installation method][1.14rustup]
6619 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6620 S390x. These are [tier 2] platforms and may have major defects. Follow the
6621 instructions on the website to install, or add the targets to an existing
6622 installation with `rustup target add`. The new target triples are:
6623 - `mips-unknown-linux-gnu`
6624 - `mipsel-unknown-linux-gnu`
6625 - `mips64-unknown-linux-gnuabi64`
6626 - `mips64el-unknown-linux-gnuabi64 `
6627 - `powerpc-unknown-linux-gnu`
6628 - `powerpc64-unknown-linux-gnu`
6629 - `powerpc64le-unknown-linux-gnu`
6630 - `s390x-unknown-linux-gnu `
6631 * This release includes target (std) builds for ARM Linux running MUSL
6632 libc. These are [tier 2] platforms and may have major defects. Add the
6633 following triples to an existing rustup installation with `rustup target add`:
6634 - `arm-unknown-linux-musleabi`
6635 - `arm-unknown-linux-musleabihf`
6636 - `armv7-unknown-linux-musleabihf`
6637 * This release includes [experimental support for WebAssembly][1.14wasm], via
6638 the `wasm32-unknown-emscripten` target. This target is known to have major
6639 defects. Please test, report, and fix.
6640 * rustup no longer installs documentation by default. Run `rustup
6641 component add rust-docs` to install.
6642 * [Fix line stepping in debugger][37310]
6643 * [Enable line number debuginfo in releases][37280]
6648 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6649 * [Add support for Fuchsia OS][37313]
6650 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6655 * [A number of forward-compatibility lints used by the compiler
6656 to gradually introduce language changes have been converted
6657 to deny by default][36894]:
6658 - ["use of inaccessible extern crate erroneously allowed"][36886]
6659 - ["type parameter default erroneously allowed in invalid location"][36887]
6660 - ["detects super or self keywords at the beginning of global path"][36888]
6661 - ["two overlapping inherent impls define an item with the same name
6662 were erroneously allowed"][36889]
6663 - ["floating-point constants cannot be used in patterns"][36890]
6664 - ["constants of struct or enum type can only be used in a pattern if
6665 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6666 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6667 * [Prohibit patterns in trait methods without bodies][37378]
6668 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6669 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6670 * [The `$crate` macro variable is accepted in fewer locations][37213]
6671 * [Impls specifying extra region requirements beyond the trait
6672 they implement are rejected][37167]
6673 * [Enums may not be unsized][37111]. Unsized enums are intended to
6674 work but never have. For now they are forbidden.
6675 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6677 [tier 2]: https://forge.rust-lang.org/platform-support.html
6678 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6679 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6680 [36430]: https://github.com/rust-lang/rust/pull/36430
6681 [36595]: https://github.com/rust-lang/rust/pull/36595
6682 [36692]: https://github.com/rust-lang/rust/pull/36692
6683 [36767]: https://github.com/rust-lang/rust/pull/36767
6684 [36794]: https://github.com/rust-lang/rust/pull/36794
6685 [36798]: https://github.com/rust-lang/rust/pull/36798
6686 [36819]: https://github.com/rust-lang/rust/pull/36819
6687 [36822]: https://github.com/rust-lang/rust/pull/36822
6688 [36825]: https://github.com/rust-lang/rust/pull/36825
6689 [36843]: https://github.com/rust-lang/rust/pull/36843
6690 [36880]: https://github.com/rust-lang/rust/pull/36880
6691 [36886]: https://github.com/rust-lang/rust/issues/36886
6692 [36887]: https://github.com/rust-lang/rust/issues/36887
6693 [36888]: https://github.com/rust-lang/rust/issues/36888
6694 [36889]: https://github.com/rust-lang/rust/issues/36889
6695 [36890]: https://github.com/rust-lang/rust/issues/36890
6696 [36891]: https://github.com/rust-lang/rust/issues/36891
6697 [36892]: https://github.com/rust-lang/rust/issues/36892
6698 [36894]: https://github.com/rust-lang/rust/pull/36894
6699 [36917]: https://github.com/rust-lang/rust/pull/36917
6700 [36993]: https://github.com/rust-lang/rust/pull/36993
6701 [37037]: https://github.com/rust-lang/rust/pull/37037
6702 [37064]: https://github.com/rust-lang/rust/pull/37064
6703 [37094]: https://github.com/rust-lang/rust/pull/37094
6704 [37108]: https://github.com/rust-lang/rust/pull/37108
6705 [37111]: https://github.com/rust-lang/rust/pull/37111
6706 [37161]: https://github.com/rust-lang/rust/pull/37161
6707 [37162]: https://github.com/rust-lang/rust/pull/37162
6708 [37167]: https://github.com/rust-lang/rust/pull/37167
6709 [37178]: https://github.com/rust-lang/rust/pull/37178
6710 [37200]: https://github.com/rust-lang/rust/pull/37200
6711 [37213]: https://github.com/rust-lang/rust/pull/37213
6712 [37221]: https://github.com/rust-lang/rust/pull/37221
6713 [37224]: https://github.com/rust-lang/rust/pull/37224
6714 [37230]: https://github.com/rust-lang/rust/pull/37230
6715 [37231]: https://github.com/rust-lang/rust/pull/37231
6716 [37247]: https://github.com/rust-lang/rust/pull/37247
6717 [37267]: https://github.com/rust-lang/rust/pull/37267
6718 [37270]: https://github.com/rust-lang/rust/pull/37270
6719 [37273]: https://github.com/rust-lang/rust/pull/37273
6720 [37280]: https://github.com/rust-lang/rust/pull/37280
6721 [37298]: https://github.com/rust-lang/rust/pull/37298
6722 [37306]: https://github.com/rust-lang/rust/pull/37306
6723 [37310]: https://github.com/rust-lang/rust/pull/37310
6724 [37312]: https://github.com/rust-lang/rust/pull/37312
6725 [37313]: https://github.com/rust-lang/rust/pull/37313
6726 [37315]: https://github.com/rust-lang/rust/pull/37315
6727 [37318]: https://github.com/rust-lang/rust/pull/37318
6728 [37322]: https://github.com/rust-lang/rust/pull/37322
6729 [37326]: https://github.com/rust-lang/rust/pull/37326
6730 [37351]: https://github.com/rust-lang/rust/pull/37351
6731 [37356]: https://github.com/rust-lang/rust/pull/37356
6732 [37367]: https://github.com/rust-lang/rust/pull/37367
6733 [37373]: https://github.com/rust-lang/rust/pull/37373
6734 [37378]: https://github.com/rust-lang/rust/pull/37378
6735 [37389]: https://github.com/rust-lang/rust/pull/37389
6736 [37392]: https://github.com/rust-lang/rust/pull/37392
6737 [37427]: https://github.com/rust-lang/rust/pull/37427
6738 [37439]: https://github.com/rust-lang/rust/pull/37439
6739 [37445]: https://github.com/rust-lang/rust/pull/37445
6740 [37470]: https://github.com/rust-lang/rust/pull/37470
6741 [37569]: https://github.com/rust-lang/rust/pull/37569
6742 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6743 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6744 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6745 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6746 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6747 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6748 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6751 Version 1.13.0 (2016-11-10)
6752 ===========================
6757 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6758 errors, like the `try!` macro, described in [RFC 0243].
6759 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6760 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6761 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6762 * [Fix lifetime rules for 'if' conditions][36029]
6763 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6768 * [Add the `-C link-arg` argument][36574]
6769 * [Remove the old AST-based backend from rustc_trans][35764]
6770 * [Don't enable NEON by default on armv7 Linux][35814]
6771 * [Fix debug line number info for macro expansions][35238]
6772 * [Do not emit "class method" debuginfo for types that are not
6773 DICompositeType][36008]
6774 * [Warn about multiple conflicting #[repr] hints][34623]
6775 * [When sizing DST, don't double-count nested struct prefixes][36351]
6776 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6777 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6778 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6779 * [Expand macros without recursing to avoid stack overflows][36214]
6784 * [Replace macro backtraces with labeled local uses][35702]
6785 * [Improve error message for misplaced doc comments][33922]
6786 * [Buffer unix and lock windows to prevent message interleaving][35975]
6787 * [Update lifetime errors to specifically note temporaries][36171]
6788 * [Special case a few colors for Windows][36178]
6789 * [Suggest `use self` when such an import resolves][36289]
6790 * [Be more specific when type parameter shadows primitive type][36338]
6791 * Many minor improvements
6793 Compile-time Optimizations
6794 --------------------------
6796 * [Compute and cache HIR hashes at beginning][35854]
6797 * [Don't hash types in loan paths][36004]
6798 * [Cache projections in trans][35761]
6799 * [Optimize the parser's last token handling][36527]
6800 * [Only instantiate #[inline] functions in codegen units referencing
6801 them][36524]. This leads to big improvements in cases where crates export
6802 define many inline functions without using them directly.
6803 * [Lazily allocate TypedArena's first chunk][36592]
6804 * [Don't allocate during default HashSet creation][36734]
6811 * [`overflowing_abs`]
6812 * [`RefCell::try_borrow`]
6813 * [`RefCell::try_borrow_mut`]
6818 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
6819 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
6821 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
6822 * [Implement `Debug` for `std::vec::IntoIter`][35707]
6823 * [`CString`: avoid excessive growth just to 0-terminate][35871]
6824 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
6825 * [Use arc4rand on FreeBSD][35884]
6826 * [memrchr: Correct aligned offset computation][35969]
6827 * [Improve Demangling of Rust Symbols][36059]
6828 * [Use monotonic time in condition variables][35048]
6829 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
6830 * [Implement conversion traits for `char`][35755]
6831 * [Fix illegal instruction caused by overflow in channel cloning][36104]
6832 * [Zero first byte of CString on drop][36264]
6833 * [Inherit overflow checks for sum and product][36372]
6834 * [Add missing Eq implementations][36423]
6835 * [Implement `Debug` for `DirEntry`][36631]
6836 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
6838 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6839 * [Implement more traits for `std::io::ErrorKind`][35911]
6840 * [Optimize BinaryHeap bounds checking][36072]
6841 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
6842 `extend_with_element`][36355]
6843 * [Fix overflow checking in unsigned pow()][34942]
6848 * This release includes security fixes to both curl and OpenSSL.
6849 * [Fix transitive doctests when panic=abort][cargo/3021]
6850 * [Add --all-features flag to cargo][cargo/3038]
6851 * [Reject path-based dependencies in `cargo package`][cargo/3060]
6852 * [Don't parse the home directory more than once][cargo/3078]
6853 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
6854 * [Update OpenSSL to 1.0.2j][cargo/3121]
6855 * [Add license and license_file to cargo metadata output][cargo/3110]
6856 * [Make crates-io registry URL optional in config; ignore all changes to
6857 source.crates-io][cargo/3089]
6858 * [Don't download dependencies from other platforms][cargo/3123]
6859 * [Build transitive dev-dependencies when needed][cargo/3125]
6860 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
6861 * [Avoid updating registry when adding existing deps][cargo/3144]
6862 * [Warn about path overrides that won't work][cargo/3136]
6863 * [Use workspaces during `cargo install`][cargo/3146]
6864 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
6865 * [Add --message-format flag][cargo/3000]
6866 * [Pass target environment for rustdoc][cargo/3205]
6867 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
6868 * [Update curl and curl-sys][cargo/3241]
6869 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
6874 * [rustdoc: Add the `--sysroot` argument][36586]
6875 * [rustdoc: Fix a couple of issues with the search results][35655]
6876 * [rustdoc: remove the `!` from macro URLs and titles][35234]
6877 * [gdb: Fix pretty-printing special-cased Rust types][35585]
6878 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
6883 * [Remove unmaintained style guide][35124]
6884 * [Add s390x support][36369]
6885 * [Initial work at Haiku OS support][36727]
6886 * [Add mips-uclibc targets][35734]
6887 * [Crate-ify compiler-rt into compiler-builtins][35021]
6888 * [Add rustc version info (git hash + date) to dist tarball][36213]
6889 * Many documentation improvements
6894 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
6895 * [Deny (by default) transmuting from fn item types to pointer-sized
6896 types][34923]. Continuing the long transition to zero-sized fn items,
6898 * [Fix `#[derive]` for empty tuple structs/variants][35728].
6900 * [Issue deprecation warnings for safe accesses to extern statics][36173]
6901 * [Fix lifetime rules for 'if' conditions][36029].
6902 * [Inherit overflow checks for sum and product][36372].
6903 * [Forbid user-defined macros named "macro_rules"][36730].
6905 [33922]: https://github.com/rust-lang/rust/pull/33922
6906 [34623]: https://github.com/rust-lang/rust/pull/34623
6907 [34923]: https://github.com/rust-lang/rust/pull/34923
6908 [34942]: https://github.com/rust-lang/rust/pull/34942
6909 [35021]: https://github.com/rust-lang/rust/pull/35021
6910 [35048]: https://github.com/rust-lang/rust/pull/35048
6911 [35074]: https://github.com/rust-lang/rust/pull/35074
6912 [35124]: https://github.com/rust-lang/rust/pull/35124
6913 [35234]: https://github.com/rust-lang/rust/pull/35234
6914 [35238]: https://github.com/rust-lang/rust/pull/35238
6915 [35354]: https://github.com/rust-lang/rust/pull/35354
6916 [35559]: https://github.com/rust-lang/rust/pull/35559
6917 [35585]: https://github.com/rust-lang/rust/pull/35585
6918 [35627]: https://github.com/rust-lang/rust/pull/35627
6919 [35655]: https://github.com/rust-lang/rust/pull/35655
6920 [35702]: https://github.com/rust-lang/rust/pull/35702
6921 [35707]: https://github.com/rust-lang/rust/pull/35707
6922 [35728]: https://github.com/rust-lang/rust/pull/35728
6923 [35734]: https://github.com/rust-lang/rust/pull/35734
6924 [35755]: https://github.com/rust-lang/rust/pull/35755
6925 [35761]: https://github.com/rust-lang/rust/pull/35761
6926 [35764]: https://github.com/rust-lang/rust/pull/35764
6927 [35814]: https://github.com/rust-lang/rust/pull/35814
6928 [35854]: https://github.com/rust-lang/rust/pull/35854
6929 [35871]: https://github.com/rust-lang/rust/pull/35871
6930 [35884]: https://github.com/rust-lang/rust/pull/35884
6931 [35911]: https://github.com/rust-lang/rust/pull/35911
6932 [35969]: https://github.com/rust-lang/rust/pull/35969
6933 [35975]: https://github.com/rust-lang/rust/pull/35975
6934 [36004]: https://github.com/rust-lang/rust/pull/36004
6935 [36008]: https://github.com/rust-lang/rust/pull/36008
6936 [36014]: https://github.com/rust-lang/rust/pull/36014
6937 [36029]: https://github.com/rust-lang/rust/pull/36029
6938 [36059]: https://github.com/rust-lang/rust/pull/36059
6939 [36072]: https://github.com/rust-lang/rust/pull/36072
6940 [36101]: https://github.com/rust-lang/rust/pull/36101
6941 [36104]: https://github.com/rust-lang/rust/pull/36104
6942 [36171]: https://github.com/rust-lang/rust/pull/36171
6943 [36173]: https://github.com/rust-lang/rust/pull/36173
6944 [36178]: https://github.com/rust-lang/rust/pull/36178
6945 [36213]: https://github.com/rust-lang/rust/pull/36213
6946 [36214]: https://github.com/rust-lang/rust/pull/36214
6947 [36264]: https://github.com/rust-lang/rust/pull/36264
6948 [36266]: https://github.com/rust-lang/rust/pull/36266
6949 [36289]: https://github.com/rust-lang/rust/pull/36289
6950 [36338]: https://github.com/rust-lang/rust/pull/36338
6951 [36351]: https://github.com/rust-lang/rust/pull/36351
6952 [36355]: https://github.com/rust-lang/rust/pull/36355
6953 [36369]: https://github.com/rust-lang/rust/pull/36369
6954 [36372]: https://github.com/rust-lang/rust/pull/36372
6955 [36423]: https://github.com/rust-lang/rust/pull/36423
6956 [36482]: https://github.com/rust-lang/rust/pull/36482
6957 [36505]: https://github.com/rust-lang/rust/pull/36505
6958 [36524]: https://github.com/rust-lang/rust/pull/36524
6959 [36527]: https://github.com/rust-lang/rust/pull/36527
6960 [36551]: https://github.com/rust-lang/rust/pull/36551
6961 [36574]: https://github.com/rust-lang/rust/pull/36574
6962 [36586]: https://github.com/rust-lang/rust/pull/36586
6963 [36592]: https://github.com/rust-lang/rust/pull/36592
6964 [36631]: https://github.com/rust-lang/rust/pull/36631
6965 [36721]: https://github.com/rust-lang/rust/pull/36721
6966 [36727]: https://github.com/rust-lang/rust/pull/36727
6967 [36730]: https://github.com/rust-lang/rust/pull/36730
6968 [36734]: https://github.com/rust-lang/rust/pull/36734
6969 [36754]: https://github.com/rust-lang/rust/pull/36754
6970 [36995]: https://github.com/rust-lang/rust/pull/36995
6971 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
6972 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
6973 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6974 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
6975 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
6976 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
6977 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
6978 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
6979 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
6980 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
6981 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
6982 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
6983 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
6984 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
6985 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
6986 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
6987 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
6988 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
6989 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
6990 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
6991 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
6992 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
6993 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
6994 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
6995 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
6996 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
6997 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
6998 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
6999 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7000 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7001 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7002 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7005 Version 1.12.1 (2016-10-20)
7006 ===========================
7011 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7012 * [Confusion with double negation and booleans][36856]
7013 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7014 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7015 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7016 * [Corrupted memory after updated to 1.12][36936]
7017 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7018 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7019 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7021 [36381]: https://github.com/rust-lang/rust/issues/36381
7022 [36856]: https://github.com/rust-lang/rust/issues/36856
7023 [36875]: https://github.com/rust-lang/rust/issues/36875
7024 [36924]: https://github.com/rust-lang/rust/issues/36924
7025 [36926]: https://github.com/rust-lang/rust/issues/36926
7026 [36936]: https://github.com/rust-lang/rust/issues/36936
7027 [37026]: https://github.com/rust-lang/rust/issues/37026
7028 [37112]: https://github.com/rust-lang/rust/issues/37112
7029 [37153]: https://github.com/rust-lang/rust/issues/37153
7032 Version 1.12.0 (2016-09-29)
7033 ===========================
7038 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7039 This translation pass is far simpler than the previous AST->LLVM pass, and
7040 creates opportunities to perform new optimizations directly on the MIR. It
7041 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7042 * [`rustc` presents a new, more readable error format, along with
7043 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7044 Most common editors supporting Rust have been updated to work with it. It was
7045 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7050 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7051 This translation pass is far simpler than the previous AST->LLVM pass, and
7052 creates opportunities to perform new optimizations directly on the MIR. It
7053 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7054 * [Print the Rust target name, not the LLVM target name, with
7055 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7056 * [The computation of `TypeId` is correct in some cases where it was previously
7057 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7058 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7059 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7060 `--print relocation-models`, and `--print code-models` print the available
7061 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7062 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7063 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7064 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7065 These targets produce statically-linked binaries. There are no binary release
7071 * [`rustc` presents a new, more readable error format, along with
7072 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7073 Most common editors supporting Rust have been updated to work with it. It was
7074 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7075 * [In error descriptions, references are now described in plain English,
7076 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7077 * [In error type descriptions, unknown numeric types are named `{integer}` or
7078 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7079 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7084 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7085 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7086 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7087 useful](https://github.com/rust-lang/rust/pull/34908)
7088 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7089 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7090 * [Semicolons are properly required as statement delimiters inside
7091 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7092 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7097 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7098 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7099 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7100 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7101 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7102 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7103 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7104 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7105 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7106 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7107 Both on Unix and Windows.
7108 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7109 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7110 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7111 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7112 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7113 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7114 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7115 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7120 * [The `format!` macro and friends now allow a single argument to be formatted
7121 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7122 * [The lifetime bounds on `[T]::binary_search_by` and
7123 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7124 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7125 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7126 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7127 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7128 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7129 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7130 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7131 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7132 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7133 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7134 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7135 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7136 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7137 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7138 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7139 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7140 * [`mpsc::sync_channel` `Receiver`s return any available message before
7141 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7142 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7143 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7148 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7149 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7150 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7151 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7152 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7153 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7154 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7155 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7156 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7157 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7158 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7159 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7160 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7161 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7162 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7163 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7168 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7169 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7174 * [Test binaries now support a `--test-threads` argument to specify the number
7175 of threads used to run tests, and which acts the same as the
7176 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7177 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7178 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7179 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7180 * [Rust releases now come with source packages that can be installed by rustup
7181 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7182 The resulting source code can be used by tools and IDES, located in the
7183 sysroot under `lib/rustlib/src`.
7188 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7189 * Many minor improvements to the documentation.
7190 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7195 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7196 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7197 * [When formatting strings, if "precision" is specified, the "fill",
7198 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7199 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7202 Version 1.11.0 (2016-08-18)
7203 ===========================
7208 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7209 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7210 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7211 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7216 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7217 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7218 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7219 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7220 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7221 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7222 (in libcore - previously stabilized in libstd)
7223 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7224 (in libcore - previously stabilized in libstd)
7225 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7226 (in libcore - previously stabilized in libstd)
7227 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7228 (in libcore - previously stabilized in libstd)
7229 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7230 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7231 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7232 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7237 * [The `thread_local!` macro supports multiple definitions in a single
7238 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7239 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7240 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7241 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7242 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7243 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7244 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7245 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7250 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7251 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7252 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7253 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7254 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7255 and `-vv` prints warnings for all crates.
7256 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7257 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7258 This provides room for expansion by arbitrary tools.
7259 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7260 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7261 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7262 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7263 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7264 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7265 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7270 * [Caching projections speeds up type check dramatically for some
7271 workloads](https://github.com/rust-lang/rust/pull/33816)
7272 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7273 This hasher is faster, but is believed to provide sufficient
7274 protection from collision attacks.
7275 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7280 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7281 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7282 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7283 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7284 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7289 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7290 * [When emitting debug info, rustc emits frame pointers for closures,
7291 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7292 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7293 * Many more errors have been given error codes and extended
7295 * API documentation continues to be improved, with many new examples
7300 * [rustc no longer hangs when dependencies recursively re-export
7301 submodules](https://github.com/rust-lang/rust/pull/34542)
7302 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7303 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7304 rewritten](https://github.com/rust-lang/rust/pull/33895)
7305 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7306 No targets use this yet, but it works toward AVR support.
7311 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7312 * [The new follow-set rules that place restrictions on `macro_rules!`
7313 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7314 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7315 and has been a warning since 1.10.
7316 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7317 This causes breakage in some corner cases.
7320 Version 1.10.0 (2016-07-07)
7321 ===========================
7326 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7327 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7328 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7329 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7330 * [`panic!` can be converted to a runtime abort with the
7331 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7332 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7333 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7334 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7335 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7336 Note that Cargo does not yet directly support cdylibs.
7341 * `os::windows::fs::OpenOptionsExt::access_mode`
7342 * `os::windows::fs::OpenOptionsExt::share_mode`
7343 * `os::windows::fs::OpenOptionsExt::custom_flags`
7344 * `os::windows::fs::OpenOptionsExt::attributes`
7345 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7346 * `os::unix::fs::OpenOptionsExt::custom_flags`
7347 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7348 * `Default for sync::Weak`
7349 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7350 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7351 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7352 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7353 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7354 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7355 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7356 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7357 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7358 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7359 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7360 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7361 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7362 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7363 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7364 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7365 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7366 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7367 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7368 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7369 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7370 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7371 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7372 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7373 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7374 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7375 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7376 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7377 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7378 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7379 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7380 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7381 * Read/Write/RawFd impls for `UnixStream`
7382 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7383 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7384 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7385 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7386 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7387 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7388 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7389 * RawFd impls for `UnixListener`
7390 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7391 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7392 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7393 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7394 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7395 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7396 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7397 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7398 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7399 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7400 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7401 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7402 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7403 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7404 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7405 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7406 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7407 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7408 * RawFd impls for `UnixDatagram`
7409 * `{BTree,Hash}Map::values_mut`
7410 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7415 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7416 The semantics of this minor method are subtle and probably not what
7418 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7419 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7420 will fall back to `/dev/urandom` temporarily to avoid blocking
7421 during early boot](https://github.com/rust-lang/rust/pull/33086).
7422 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7423 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7424 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7425 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7426 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7427 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7428 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7432 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7433 This controls the runtime behavior of the `panic!` macro
7434 and can be either "unwind" (the default), or "abort".
7435 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7436 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7437 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7438 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7439 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7440 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7441 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7442 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7443 By default they are retried twice, which can be customized with the
7444 `net.retry` value in `.cargo/config`.
7445 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7446 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7447 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7448 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7449 Makes it possible to install multiple crates in parallel.
7450 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7451 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7452 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7453 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7454 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7455 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7460 * [rustc memory usage was reduced by refactoring the context used for
7461 type checking](https://github.com/rust-lang/rust/pull/33425).
7462 * [Speed up creation of `HashMap`s by caching the random keys used
7463 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7464 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7465 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7466 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7467 10x faster than the previous lookup tables.
7468 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7473 * Many incremental improvements to documentation and rustdoc.
7474 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7475 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7476 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7477 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7478 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7479 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7480 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7485 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7486 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7487 * [`std` no longer prints backtraces on platforms where the running
7488 module must be loaded with `env::current_exe`, which can't be relied
7489 on](https://github.com/rust-lang/rust/pull/33554).
7490 * This release includes std binaries for the i586-unknown-linux-gnu,
7491 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7492 i586 target is for old x86 hardware without SSE2, and the armv7
7493 target is for Android running on modern ARM architectures.
7494 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7495 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7496 * [On Unix the runtime aborts by calling `libc::abort` instead of
7497 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7498 * [Rust is now bootstrapped from the previous release of Rust,
7499 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7504 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7505 * [`target_env` for Linux ARM targets is just `gnu`, not
7506 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7507 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7508 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7509 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7510 Affects how macros are parsed.
7511 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7512 * [Feature-gated attributes on macro-generated macro invocations are
7513 now rejected](https://github.com/rust-lang/rust/pull/32791).
7514 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7515 This caused some minor changes to type inference.
7518 Version 1.9.0 (2016-05-26)
7519 ==========================
7524 * The `#[deprecated]` attribute when applied to an API will generate
7525 warnings when used. The warnings may be suppressed with
7526 `#[allow(deprecated)]`. [RFC 1270].
7527 * [`fn` item types are zero sized, and each `fn` names a unique
7528 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7529 `transmute` on a `fn` type will generate a warning for a few cycles,
7530 then will be converted to an error.
7531 * [Field and method resolution understand visibility, so private
7532 fields and methods cannot prevent the proper use of public fields
7533 and methods][1.9fv].
7534 * [The parser considers unicode codepoints in the
7535 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7541 * [`std::panic::catch_unwind`] (renamed from `recover`)
7542 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7543 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7544 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7545 * [`str::is_char_boundary`]
7546 * [`<*const T>::as_ref`]
7547 * [`<*mut T>::as_ref`]
7548 * [`<*mut T>::as_mut`]
7549 * [`AsciiExt::make_ascii_uppercase`]
7550 * [`AsciiExt::make_ascii_lowercase`]
7551 * [`char::decode_utf16`]
7552 * [`char::DecodeUtf16`]
7553 * [`char::DecodeUtf16Error`]
7554 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7555 * [`BTreeSet::take`]
7556 * [`BTreeSet::replace`]
7559 * [`HashSet::replace`]
7561 * [`OsString::with_capacity`]
7562 * [`OsString::clear`]
7563 * [`OsString::capacity`]
7564 * [`OsString::reserve`]
7565 * [`OsString::reserve_exact`]
7566 * [`OsStr::is_empty`]
7568 * [`std::os::unix::thread`]
7571 * [`JoinHandleExt::as_pthread_t`]
7572 * [`JoinHandleExt::into_pthread_t`]
7573 * [`HashSet::hasher`]
7574 * [`HashMap::hasher`]
7575 * [`CommandExt::exec`]
7576 * [`File::try_clone`]
7577 * [`SocketAddr::set_ip`]
7578 * [`SocketAddr::set_port`]
7579 * [`SocketAddrV4::set_ip`]
7580 * [`SocketAddrV4::set_port`]
7581 * [`SocketAddrV6::set_ip`]
7582 * [`SocketAddrV6::set_port`]
7583 * [`SocketAddrV6::set_flowinfo`]
7584 * [`SocketAddrV6::set_scope_id`]
7585 * [`slice::copy_from_slice`]
7586 * [`ptr::read_volatile`]
7587 * [`ptr::write_volatile`]
7588 * [`OpenOptions::create_new`]
7589 * [`TcpStream::set_nodelay`]
7590 * [`TcpStream::nodelay`]
7591 * [`TcpStream::set_ttl`]
7592 * [`TcpStream::ttl`]
7593 * [`TcpStream::set_only_v6`]
7594 * [`TcpStream::only_v6`]
7595 * [`TcpStream::take_error`]
7596 * [`TcpStream::set_nonblocking`]
7597 * [`TcpListener::set_ttl`]
7598 * [`TcpListener::ttl`]
7599 * [`TcpListener::set_only_v6`]
7600 * [`TcpListener::only_v6`]
7601 * [`TcpListener::take_error`]
7602 * [`TcpListener::set_nonblocking`]
7603 * [`UdpSocket::set_broadcast`]
7604 * [`UdpSocket::broadcast`]
7605 * [`UdpSocket::set_multicast_loop_v4`]
7606 * [`UdpSocket::multicast_loop_v4`]
7607 * [`UdpSocket::set_multicast_ttl_v4`]
7608 * [`UdpSocket::multicast_ttl_v4`]
7609 * [`UdpSocket::set_multicast_loop_v6`]
7610 * [`UdpSocket::multicast_loop_v6`]
7611 * [`UdpSocket::set_multicast_ttl_v6`]
7612 * [`UdpSocket::multicast_ttl_v6`]
7613 * [`UdpSocket::set_ttl`]
7614 * [`UdpSocket::ttl`]
7615 * [`UdpSocket::set_only_v6`]
7616 * [`UdpSocket::only_v6`]
7617 * [`UdpSocket::join_multicast_v4`]
7618 * [`UdpSocket::join_multicast_v6`]
7619 * [`UdpSocket::leave_multicast_v4`]
7620 * [`UdpSocket::leave_multicast_v6`]
7621 * [`UdpSocket::take_error`]
7622 * [`UdpSocket::connect`]
7623 * [`UdpSocket::send`]
7624 * [`UdpSocket::recv`]
7625 * [`UdpSocket::set_nonblocking`]
7630 * [`std::sync::Once` is poisoned if its initialization function
7632 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7633 * [Most types implement `fmt::Debug`][1.9db].
7634 * [The default buffer size used by `BufReader` and `BufWriter` was
7635 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7636 used by other languages.
7637 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7638 `Duration` additionally implements `*=` and `/=`][1.9ta].
7639 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7640 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7641 * [`Chain` implements `BufRead`][1.9ch].
7642 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7647 * [Cargo can now run concurrently][1.9cc].
7648 * [Top-level overrides allow specific revisions of crates to be
7649 overridden through the entire crate graph][1.9ct]. This is intended
7650 to make upgrades easier for large projects, by allowing crates to be
7651 forked temporarily until they've been upgraded and republished.
7652 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7653 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7654 on the commandline][1.9cf]. `rustc` arguments can also be specified
7655 in the `build.rustflags` configuration key.
7660 * [The time complexity of comparing variables for equivalence during type
7661 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7662 to major compilation time improvement in some scenarios.
7663 * [`ToString` is specialized for `str`, giving it the same performance
7664 as `to_owned`][1.9ts].
7665 * [Spawning processes with `Command::output` no longer creates extra
7667 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7668 for C-like enums][1.9cl].
7673 * [Passing the `--quiet` flag to a test runner will produce
7674 much-abbreviated output][1.9q].
7675 * The Rust Project now publishes std binaries for the
7676 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7677 `i586-pc-windows-msvc` targets.
7682 * [`std::sync::Once` is poisoned if its initialization function
7684 * [It is illegal to define methods with the same name in overlapping
7685 inherent `impl` blocks][1.9sn].
7686 * [`fn` item types are zero sized, and each `fn` names a unique
7687 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7688 `transmute` on a `fn` type will generate a warning for a few cycles,
7689 then will be converted to an error.
7690 * [Improvements to const evaluation may trigger new errors when integer
7691 literals are out of range][1.9ce].
7694 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7695 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7696 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7697 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7698 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7699 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7700 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7701 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7702 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7703 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7704 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7705 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7706 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7707 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7708 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7709 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7710 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7711 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7712 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7713 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7714 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7715 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7716 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7717 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7718 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7719 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7720 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7721 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7722 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7723 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7724 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7725 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7726 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7727 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7728 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7729 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7730 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7731 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7732 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7733 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7734 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7735 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7736 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7737 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7738 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7739 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7740 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7741 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7742 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7743 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7744 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7745 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7746 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7747 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7748 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7749 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7750 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7751 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7752 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7753 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7754 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7755 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7756 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7757 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7758 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7759 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7760 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7761 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7762 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7763 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7764 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7765 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7766 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7767 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7768 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7769 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7770 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7771 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7772 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7773 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7774 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7775 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7776 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7777 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7778 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7779 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7780 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7781 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7782 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7783 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7784 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7785 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7786 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7787 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7788 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7789 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7790 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7791 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7792 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7793 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7794 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7795 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
7796 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
7797 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
7798 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
7799 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
7800 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
7801 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
7802 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
7803 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
7806 Version 1.8.0 (2016-04-14)
7807 ==========================
7812 * Rust supports overloading of compound assignment statements like
7813 `+=` by implementing the [`AddAssign`], [`SubAssign`],
7814 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
7815 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
7817 * Empty structs can be defined with braces, as in `struct Foo { }`, in
7818 addition to the non-braced form, `struct Foo;`. [RFC 218].
7824 * [`str::encode_utf16`] (renamed from `utf16_units`)
7825 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
7828 * [`ptr::drop_in_place`]
7830 * [`time::SystemTime`]
7832 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
7833 * [`Instant::elapsed`]
7834 * [`SystemTime::now`]
7835 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
7836 * [`SystemTime::elapsed`]
7837 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
7838 * [`SystemTimeError`]
7839 * [`SystemTimeError::duration`]
7840 * Various impls for `SystemTimeError`
7842 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
7843 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
7844 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
7845 * [The `write!` and `writeln!` macros correctly emit errors if any of
7846 their arguments can't be formatted][1.8w].
7847 * [Various I/O functions support large files on 32-bit Linux][1.8l].
7848 * [The Unix-specific `raw` modules, which contain a number of
7849 redefined C types are deprecated][1.8r], including `os::raw::unix`,
7850 `os::raw::macos`, and `os::raw::linux`. These modules defined types
7851 such as `ino_t` and `dev_t`. The inconsistency of these definitions
7852 across platforms was making it difficult to implement `std`
7853 correctly. Those that need these definitions should use the `libc`
7855 * The Unix-specific `MetadataExt` traits, including
7856 `os::unix::fs::MetadataExt`, which expose values such as inode
7857 numbers [no longer return platform-specific types][1.8r], but
7858 instead return widened integers. [RFC 1415].
7859 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
7860 * [Atomic loads and stores are not volatile][1.8a].
7861 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
7866 * [Inlining hash functions lead to a 3% compile-time improvement in
7867 some workloads][1.8h].
7868 * When using jemalloc, its symbols are [unprefixed so that it
7869 overrides the libc malloc implementation][1.8h]. This means that for
7870 rustc, LLVM is now using jemalloc, which results in a 6%
7871 compile-time improvement on a specific workload.
7872 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
7877 * [32-bit MSVC builds finally implement unwinding][1.8ms].
7878 i686-pc-windows-msvc is now considered a tier-1 platform.
7879 * [The `--print targets` flag prints a list of supported targets][1.8t].
7880 * [The `--print cfg` flag prints the `cfg`s defined for the current
7882 * [`rustc` can be built with an new Cargo-based build system, written
7883 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
7884 build system. To enable it configure with `configure --rustbuild`.
7885 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
7886 variants while also indicating the total number of missing variants
7887 if more than 3][1.8m].
7888 * [Executable stacks are disabled on Linux and BSD][1.8nx].
7889 * The Rust Project now publishes binary releases of the standard
7890 library for a number of tier-2 targets:
7891 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
7892 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
7893 `x86_64-rumprun-netbsd`. These can be installed with
7894 tools such as [multirust][1.8mr].
7899 * [`cargo init` creates a new Cargo project in the current
7900 directory][1.8ci]. It is otherwise like `cargo new`.
7901 * [Cargo has configuration keys for `-v` and
7902 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
7903 `[term]` section of `.cargo/config`.
7904 * [Configuration keys that evaluate to strings or integers can be set
7905 via environment variables][1.8ce]. For example the `build.jobs` key
7906 can be set via `CARGO_BUILD_JOBS`. Environment variables take
7907 precedence over config files.
7908 * [Target-specific dependencies support Rust `cfg` syntax for
7909 describing targets][1.8cfg] so that dependencies for multiple
7910 targets can be specified together. [RFC 1361].
7911 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
7912 `RUSTDOC` take precedence over the `build.target-dir`,
7913 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
7914 * [The child process tree is killed on Windows when Cargo is
7916 * [The `build.target` configuration value sets the target platform,
7917 like `--target`][1.8ct].
7922 * [Unstable compiler flags have been further restricted][1.8u]. Since
7923 1.0 `-Z` flags have been considered unstable, and other flags that
7924 were considered unstable additionally required passing `-Z
7925 unstable-options` to access. Unlike unstable language and library
7926 features though, these options have been accessible on the stable
7927 release channel. Going forward, *new unstable flags will not be
7928 available on the stable release channel*, and old unstable flags
7929 will warn about their usage. In the future, all unstable flags will
7930 be unavailable on the stable release channel.
7931 * [It is no longer possible to `match` on empty enum variants using
7932 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
7933 * The Unix-specific `MetadataExt` traits, including
7934 `os::unix::fs::MetadataExt`, which expose values such as inode
7935 numbers [no longer return platform-specific types][1.8r], but
7936 instead return widened integers. [RFC 1415].
7937 * [Modules sourced from the filesystem cannot appear within arbitrary
7938 blocks, but only within other modules][1.8mf].
7939 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
7940 * On Unix, [stack overflow triggers a runtime abort instead of a
7942 * [`Command::spawn` and its equivalents return an error if any of
7943 its command-line arguments contain interior `NUL`s][1.8n].
7944 * [Tuple and unit enum variants from other crates are in the type
7946 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
7947 type instead of `.a` files][1.8st]. Additionally, for the MSVC
7948 toolchain, `rustc` emits import libraries named `foo.dll.lib`
7949 instead of `foo.lib`.
7952 [1.8a]: https://github.com/rust-lang/rust/pull/30962
7953 [1.8b]: https://github.com/rust-lang/rust/pull/31123
7954 [1.8c]: https://github.com/rust-lang/rust/pull/31530
7955 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
7956 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
7957 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
7958 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
7959 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
7960 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
7961 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
7962 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
7963 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
7964 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
7965 [1.8h]: https://github.com/rust-lang/rust/pull/31460
7966 [1.8l]: https://github.com/rust-lang/rust/pull/31668
7967 [1.8m]: https://github.com/rust-lang/rust/pull/31020
7968 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
7969 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
7970 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
7971 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
7972 [1.8n]: https://github.com/rust-lang/rust/pull/31056
7973 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
7974 [1.8r]: https://github.com/rust-lang/rust/pull/31551
7975 [1.8so]: https://github.com/rust-lang/rust/pull/31333
7976 [1.8st]: https://github.com/rust-lang/rust/pull/29520
7977 [1.8t]: https://github.com/rust-lang/rust/pull/31358
7978 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
7979 [1.8u]: https://github.com/rust-lang/rust/pull/31793
7980 [1.8v]: https://github.com/rust-lang/rust/pull/31757
7981 [1.8w]: https://github.com/rust-lang/rust/pull/31904
7982 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
7983 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
7984 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
7985 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
7986 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
7987 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
7988 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
7989 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
7990 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
7991 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
7992 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
7993 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
7994 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
7995 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
7996 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
7997 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
7998 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
7999 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8000 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8001 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8002 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8003 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8004 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8005 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8006 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8007 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8008 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8009 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8010 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8011 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8014 Version 1.7.0 (2016-03-03)
8015 ==========================
8022 * [`Path::strip_prefix`] (renamed from relative_from)
8023 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8025 * [`Ipv4Addr::is_loopback`]
8026 * [`Ipv4Addr::is_private`]
8027 * [`Ipv4Addr::is_link_local`]
8028 * [`Ipv4Addr::is_multicast`]
8029 * [`Ipv4Addr::is_broadcast`]
8030 * [`Ipv4Addr::is_documentation`]
8032 * [`Ipv6Addr::is_unspecified`]
8033 * [`Ipv6Addr::is_loopback`]
8034 * [`Ipv6Addr::is_multicast`]
8037 * [`Vec::as_mut_slice`]
8039 * [`String::as_str`]
8040 * [`String::as_mut_str`]
8042 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8044 * `<[T]>::`[`sort_by_key`]
8045 * checked, saturated, and overflowing operations
8046 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8047 * [`i32::saturating_mul`]
8048 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8049 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8050 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8051 * [`u32::saturating_mul`]
8052 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8053 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8054 * and checked, saturated, and overflowing operations for other primitive types
8056 * [`ffi::IntoStringError`]
8057 * [`CString::into_string`]
8058 * [`CString::into_bytes`]
8059 * [`CString::into_bytes_with_nul`]
8060 * `From<CString> for Vec<u8>`
8062 * [`IntoStringError::into_cstring`]
8063 * [`IntoStringError::utf8_error`]
8064 * `Error for IntoStringError`
8066 * [`std::hash::BuildHasher`]
8067 * [`BuildHasher::Hasher`]
8068 * [`BuildHasher::build_hasher`]
8069 * [`std::hash::BuildHasherDefault`]
8070 * [`HashMap::with_hasher`]
8071 * [`HashMap::with_capacity_and_hasher`]
8072 * [`HashSet::with_hasher`]
8073 * [`HashSet::with_capacity_and_hasher`]
8074 * [`std::collections::hash_map::RandomState`]
8075 * [`RandomState::new`]
8076 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8077 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8078 from bytes is faster.
8079 * [The performance of `LineWriter` (and thus `io::stdout`) was
8080 improved by using `memchr` to search for newlines][1.7m].
8081 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8082 `f64` variants were stabilized previously.
8083 * [`BTreeMap` was rewritten to use less memory and improve the performance
8084 of insertion and iteration, the latter by as much as 5x][1.7bm].
8085 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8086 covariant over their contained type][1.7bt].
8087 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8088 over their contained type][1.7ll].
8089 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8091 * [`Any` is implemented for unsized types][1.7a].
8092 * [`Hash` is implemented for `Duration`][1.7h].
8097 * [When running tests with `--test`, rustdoc will pass `--cfg`
8098 arguments to the compiler][1.7dt].
8099 * [The compiler is built with RPATH information by default][1.7rpa].
8100 This means that it will be possible to run `rustc` when installed in
8101 unusual configurations without configuring the dynamic linker search
8103 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8104 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8105 over `LD_LIBRARY_PATH`.
8110 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8111 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8112 * [The `rerun-if-changed` build script directive no longer causes the
8113 build script to incorrectly run twice in certain scenarios][1.7rr].
8118 * Soundness fixes to the interactions between associated types and
8119 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8120 code that violates the new rules. This is a significant change that
8121 is known to break existing code, so it has emitted warnings for the
8122 new error cases since 1.4 to give crate authors time to adapt. The
8123 details of what is changing are subtle; read the RFC for more.
8124 * [Several bugs in the compiler's visibility calculations were
8125 fixed][1.7v]. Since this was found to break significant amounts of
8126 code, the new errors will be emitted as warnings for several release
8127 cycles, under the `private_in_public` lint.
8128 * Defaulted type parameters were accidentally accepted in positions
8129 that were not intended. In this release, [defaulted type parameters
8130 appearing outside of type definitions will generate a
8131 warning][1.7d], which will become an error in future releases.
8132 * [Parsing "." as a float results in an error instead of 0][1.7p].
8133 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8134 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8136 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8137 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8138 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8139 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8140 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8141 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8142 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8143 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8144 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8145 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8146 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8147 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8148 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8149 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8150 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8151 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8152 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8153 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8154 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8155 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8156 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8157 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8158 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8159 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8160 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8161 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8162 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8163 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8164 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8165 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8166 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8167 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8168 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8169 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8170 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8171 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8172 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8173 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8174 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8175 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8176 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8177 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8178 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8179 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8180 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8181 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8182 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8183 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8184 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8185 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8186 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8187 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8188 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8189 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8190 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8191 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8192 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8193 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8194 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8195 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8196 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8197 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8198 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8199 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8200 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8201 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8202 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8203 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8204 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8205 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8206 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8207 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8208 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8209 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8210 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8211 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8212 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8213 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8214 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8217 Version 1.6.0 (2016-01-21)
8218 ==========================
8223 * The `#![no_std]` attribute causes a crate to not be linked to the
8224 standard library, but only the [core library][1.6co], as described
8225 in [RFC 1184]. The core library defines common types and traits but
8226 has no platform dependencies whatsoever, and is the basis for Rust
8227 software in environments that cannot support a full port of the
8228 standard library, such as operating systems. Most of the core
8229 library is now stable.
8235 [`Read::read_exact`],
8236 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8237 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8238 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8239 [`os::unix::fs::DirBuilderExt`],
8240 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8241 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8242 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8243 [`collections::hash_map::Drain`],
8244 [`collections::hash_map::HashMap::drain`],
8245 [`collections::hash_set::Drain`],
8246 [`collections::hash_set::HashSet::drain`],
8247 [`collections::binary_heap::Drain`],
8248 [`collections::binary_heap::BinaryHeap::drain`],
8249 [`Vec::extend_from_slice`] (renamed from `push_all`),
8250 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8251 [`RwLock::into_inner`],
8252 [`Iterator::min_by_key`] (renamed from `min_by`),
8253 [`Iterator::max_by_key`] (renamed from `max_by`).
8254 * The [core library][1.6co] is stable, as are most of its APIs.
8255 * [The `assert_eq!` macro supports arguments that don't implement
8256 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8258 * Several timer functions that take duration in milliseconds [are
8259 deprecated in favor of those that take `Duration`][1.6ms]. These
8260 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8261 `thread::park_timeout_ms`.
8262 * The algorithm by which `Vec` reserves additional elements was
8263 [tweaked to not allocate excessive space][1.6a] while still growing
8265 * `From` conversions are [implemented from integers to floats][1.6f]
8266 in cases where the conversion is lossless. Thus they are not
8267 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8268 or `f64`. They are also not implemented for `isize` and `usize`
8269 because the implementations would be platform-specific. `From` is
8270 also implemented from `f32` to `f64`.
8271 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8272 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8273 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8274 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8276 * Sorting slices that are already sorted [is 50% faster in some
8282 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8283 * Cargo build scripts can specify their dependencies by emitting the
8284 [`rerun-if-changed`][1.6rr] key.
8285 * crates.io will reject publication of crates with dependencies that
8286 have a wildcard version constraint. Crates with wildcard
8287 dependencies were seen to cause a variety of problems, as described
8288 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8290 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8291 release folder. A variety of artifacts that Cargo failed to clean
8292 are now correctly deleted.
8297 * The `unreachable_code` lint [warns when a function call's argument
8299 * The parser indicates [failures that may be caused by
8300 confusingly-similar Unicode characters][1.6uc]
8301 * Certain macro errors [are reported at definition time][1.6m], not
8307 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8308 environment variable when locating crates. This was a pre-cargo
8309 feature for integrating with the package manager that was
8310 accidentally never removed.
8311 * [A number of bugs were fixed in the privacy checker][1.6p] that
8312 could cause previously-accepted code to break.
8313 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8314 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8315 struct pattern syntax (`Foo(..)`) can no longer be used to match
8316 unit structs. This is a warning now, but will become an error in
8317 future releases. Patterns that share the same name as a const are
8319 * A bug was fixed that causes [rustc not to apply default type
8320 parameters][1.6xc] when resolving certain method implementations of
8321 traits defined in other crates.
8323 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8324 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8325 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8326 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8327 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8328 [1.6co]: http://doc.rust-lang.org/core/index.html
8329 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8330 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8331 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8332 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8333 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8334 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8335 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8336 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8337 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8338 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8339 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8340 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8341 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8342 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8343 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8344 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8345 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8346 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8347 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8348 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8349 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8350 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8351 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8352 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8353 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8354 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8355 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8356 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8357 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8358 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8359 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8360 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8361 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8362 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8363 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8364 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8365 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8366 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8367 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8368 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8369 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8372 Version 1.5.0 (2015-12-10)
8373 ==========================
8375 * ~700 changes, numerous bugfixes
8381 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8382 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8383 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8384 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8385 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8386 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8387 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8388 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8389 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8390 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8391 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8392 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8393 [`Path::read_link`], [`Path::symlink_metadata`],
8394 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8395 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8396 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8397 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8398 [`slice::split_first_mut`], [`slice::split_first`],
8399 [`slice::split_last_mut`], [`slice::split_last`],
8400 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8401 [`str::MatchIndices`], [`str::RMatchIndices`],
8402 [`str::match_indices`], [`str::rmatch_indices`],
8403 [`str::slice_mut_unchecked`], [`string::ParseError`].
8404 * Rust applications hosted on crates.io can be installed locally to
8405 `~/.cargo/bin` with the [`cargo install`] command. Among other
8406 things this makes it easier to augment Cargo with new subcommands:
8407 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8408 invoked as `cargo foo`.
8409 * Crates with wildcard (`*`) dependencies will [emit warnings when
8410 published][1.5w]. In 1.6 it will no longer be possible to publish
8411 crates with wildcard dependencies.
8416 * The rules determining when a particular lifetime must outlive
8417 a particular value (known as '[dropck]') have been [modified
8418 to not rely on parametricity][1.5p].
8419 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8420 and `Arc`][1.5a]. Because these smart pointer types implement
8421 `Deref`, this causes breakage in cases where the interior type
8422 contains methods of the same name.
8423 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8424 that they could drop their content. Soundness fix.
8425 * All method invocations are [properly checked][1.5wf1] for
8426 [well-formedness][1.5wf2]. Soundness fix.
8427 * Traits whose supertraits contain `Self` are [not object
8428 safe][1.5o]. Soundness fix.
8429 * Target specifications support a [`no_default_libraries`][1.5nd]
8430 setting that controls whether `-nodefaultlibs` is passed to the
8431 linker, and in turn the `is_like_windows` setting no longer affects
8432 the `-nodefaultlibs` flag.
8433 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8434 * The `#[inline]` and `#[repr]` attributes [can only appear
8435 in valid locations][1.5at].
8436 * Native libraries linked from the local crate are [passed to
8437 the linker before native libraries from upstream crates][1.5nl].
8438 * Two rarely-used attributes, `#[no_debug]` and
8439 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8440 * Negation of unsigned integers, which has been a warning for
8441 several releases, [is now behind a feature gate and will
8442 generate errors][1.5nu].
8443 * The parser accidentally accepted visibility modifiers on
8444 enum variants, a bug [which has been fixed][1.5ev].
8445 * [A bug was fixed that allowed `use` statements to import unstable
8451 * When evaluating expressions at compile-time that are not
8452 compile-time constants (const-evaluating expressions in non-const
8453 contexts), incorrect code such as overlong bitshifts and arithmetic
8454 overflow will [generate a warning instead of an error][1.5ce],
8455 delaying the error until runtime. This will allow the
8456 const-evaluator to be expanded in the future backwards-compatibly.
8457 * The `improper_ctypes` lint [no longer warns about using `isize` and
8458 `usize` in FFI][1.5ict].
8463 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8465 * `Default` is [implemented for mutable slices][1.5d].
8466 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8467 * There are now `From` conversions [between floating point
8468 types][1.5f] where the conversions are lossless.
8469 * There are now `From` conversions [between integer types][1.5i] where
8470 the conversions are lossless.
8471 * [`fs::Metadata` implements `Clone`][1.5fs].
8472 * The `parse` method [accepts a leading "+" when parsing
8474 * [`AsMut` is implemented for `Vec`][1.5am].
8475 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8476 been optimized][1.5cf] and no longer rely on the default impl.
8477 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8478 `unsafe extern "C"` function types now [implement `Clone`,
8479 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8480 `fmt::Debug` for up to 12 arguments][1.5fp].
8481 * [Dropping `Vec`s is much faster in unoptimized builds when the
8482 element types don't implement `Drop`][1.5dv].
8483 * A bug that caused in incorrect behavior when [combining `VecDeque`
8484 with zero-sized types][1.5vdz] was resolved.
8485 * [`PartialOrd` for slices is faster][1.5po].
8490 * [Crate metadata size was reduced by 20%][1.5md].
8491 * [Improvements to code generation reduced the size of libcore by 3.3
8492 MB and rustc's memory usage by 18MB][1.5m].
8493 * [Improvements to deref translation increased performance in
8494 unoptimized builds][1.5dr].
8495 * Various errors in trait resolution [are deduplicated to only be
8496 reported once][1.5te].
8497 * Rust has preliminary [support for rumprun kernels][1.5rr].
8498 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8500 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8501 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8502 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8503 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8504 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8505 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8506 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8507 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8508 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8509 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8510 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8511 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8512 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8513 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8514 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8515 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8516 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8517 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8518 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8519 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8520 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8521 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8522 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8523 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8524 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8525 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8526 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8527 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8528 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8529 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8530 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8531 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8532 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8533 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8534 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8535 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8536 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8537 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8538 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8539 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8540 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8541 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8542 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8543 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8544 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8545 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8546 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8547 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8548 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8549 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8550 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8551 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8552 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8553 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8554 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8555 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8556 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8557 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8558 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8559 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8560 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8561 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8562 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8563 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8564 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8565 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8566 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8567 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8568 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8569 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8570 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8571 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8572 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8573 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8574 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8575 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8576 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8577 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8578 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8579 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8580 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8581 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8582 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8583 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8584 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8585 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8586 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8587 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8588 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8590 Version 1.4.0 (2015-10-29)
8591 ==========================
8593 * ~1200 changes, numerous bugfixes
8598 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8599 GNU) are now supported and recommended for use.
8604 * [Several changes have been made to fix type soundness and improve
8605 the behavior of associated types][sound]. See [RFC 1214]. Although
8606 we have mostly introduced these changes as warnings this release, to
8607 become errors next release, there are still some scenarios that will
8608 see immediate breakage.
8609 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8610 line breaks in addition to `\n`][crlf].
8611 * [Loans of `'static` lifetime extend to the end of a function][stat].
8612 * [`str::parse` no longer introduces avoidable rounding error when
8613 parsing floating point numbers. Together with earlier changes to
8614 float formatting/output, "round trips" like f.to_string().parse()
8615 now preserve the value of f exactly. Additionally, leading plus
8616 signs are now accepted][fp3].
8622 * `use` statements that import multiple items [can now rename
8623 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8624 * [Binops work correctly on fat pointers][binfat].
8625 * `pub extern crate`, which does not behave as expected, [issues a
8626 warning][pec] until a better solution is found.
8631 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8632 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8633 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8634 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8635 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8636 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8637 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8638 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8639 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8640 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8641 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8642 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8643 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8644 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8645 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8646 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8647 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8648 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8650 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8651 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8652 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8653 `f64::from_str_radix`.
8654 * [Reverse-searching strings is faster with the 'two-way'
8656 * [`std::io::copy` allows `?Sized` arguments][cc].
8657 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8658 [override `count`, `nth` and `last` with an *O*(1)
8659 implementation][it].
8660 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8661 * [`IntoRawFd` has been added to the Unix-specific prelude,
8662 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8664 * [`Extend<String>` and `FromIterator<String` are both implemented for
8666 * [`IntoIterator` is implemented for references to `Option` and
8668 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8669 Copy`][ext] as part of [RFC 839]. This will cause type inference
8670 breakage in rare situations.
8671 * [`BinaryHeap` implements `Debug`][bh2].
8672 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8674 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8675 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8676 * [String comparison is faster][faststr].
8677 * `&mut T` where `T: std::fmt::Write` [also implements
8678 `std::fmt::Write`][mutw].
8679 * [A stable regression in `VecDeque::push_back` and other
8680 capacity-altering methods that caused panics for zero-sized types
8682 * [Function pointers implement traits for up to 12 parameters][fp2].
8687 * The compiler [no longer uses the 'morestack' feature to prevent
8688 stack overflow][mm]. Instead it uses guard pages and stack
8689 probes (though stack probes are not yet implemented on any platform
8691 * [The compiler matches traits faster when projections are involved][p].
8692 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8694 * [Cargo now displays useful information about what its doing during
8695 `cargo update`][cu].
8697 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8698 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8699 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8700 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8701 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8702 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8703 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8704 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8705 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8706 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8707 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8708 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8709 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8710 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8711 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8712 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8713 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8714 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8715 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8716 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8717 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8718 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8719 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8720 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8721 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8722 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8723 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8724 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8725 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8726 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8727 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8728 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8729 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8730 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8731 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8732 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8733 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8734 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8735 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8736 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8737 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8738 [bh2]: https://github.com/rust-lang/rust/pull/28156
8739 [binfat]: https://github.com/rust-lang/rust/pull/28270
8740 [bm]: https://github.com/rust-lang/rust/pull/28197
8741 [cc]: https://github.com/rust-lang/rust/pull/27531
8742 [crlf]: https://github.com/rust-lang/rust/pull/28034
8743 [cu]: https://github.com/rust-lang/cargo/pull/1931
8744 [d]: https://github.com/rust-lang/rust/pull/27825
8745 [dep]: https://github.com/rust-lang/rust/pull/28339
8746 [es]: https://github.com/rust-lang/rust/pull/27956
8747 [ext]: https://github.com/rust-lang/rust/pull/28094
8748 [faststr]: https://github.com/rust-lang/rust/pull/28338
8749 [ffi]: https://github.com/rust-lang/rust/pull/28779
8750 [fp]: https://github.com/rust-lang/rust/pull/28268
8751 [fp2]: https://github.com/rust-lang/rust/pull/28560
8752 [fp3]: https://github.com/rust-lang/rust/pull/27307
8753 [i]: https://github.com/rust-lang/rust/pull/27451
8754 [into2]: https://github.com/rust-lang/rust/pull/28039
8755 [it]: https://github.com/rust-lang/rust/pull/27652
8756 [mm]: https://github.com/rust-lang/rust/pull/27338
8757 [mutw]: https://github.com/rust-lang/rust/pull/28368
8758 [sound]: https://github.com/rust-lang/rust/pull/27641
8759 [p]: https://github.com/rust-lang/rust/pull/27866
8760 [pec]: https://github.com/rust-lang/rust/pull/28486
8761 [pr]: https://github.com/rust-lang/rust/pull/27896
8762 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8763 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8764 [s]: https://github.com/rust-lang/rust/pull/27474
8765 [stab]: https://github.com/rust-lang/rust/pull/28339
8766 [stat]: https://github.com/rust-lang/rust/pull/28321
8767 [vd]: https://github.com/rust-lang/rust/pull/28494
8769 Version 1.3.0 (2015-09-17)
8770 ==============================
8772 * ~900 changes, numerous bugfixes
8777 * The [new object lifetime defaults][nold] have been [turned
8778 on][nold2] after a cycle of warnings about the change. Now types
8779 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8780 being interpreted as `&'a Box<Trait+'a>` to `&'a
8781 Box<Trait+'static>`.
8782 * [The Rustonomicon][nom] is a new book in the official documentation
8783 that dives into writing unsafe Rust.
8784 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8785 timekeeping is employed by other std APIs, as well as out-of-tree
8791 * The [new object lifetime defaults][nold] have been [turned
8792 on][nold2] after a cycle of warnings about the change.
8793 * There is a known [regression][lr] in how object lifetime elision is
8794 interpreted, the proper solution for which is undetermined.
8795 * The `#[prelude_import]` attribute, an internal implementation
8796 detail, was accidentally stabilized previously. [It has been put
8797 behind the `prelude_import` feature gate][pi]. This change is
8798 believed to break no existing code.
8799 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8800 [more sane for dynamically sized types][dst3]. Code that relied on
8801 the previous behavior is thought to be broken.
8802 * The `dropck` rules, which checks that destructors can't access
8803 destroyed values, [have been updated][dropck] to match the
8804 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
8805 cause some previously-compiling code to no longer build.
8810 * The [new object lifetime defaults][nold] have been [turned
8811 on][nold2] after a cycle of warnings about the change.
8812 * Semicolons may [now follow types and paths in
8813 macros](https://github.com/rust-lang/rust/pull/27000).
8814 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
8815 [more sane for dynamically sized types][dst3]. Code that relied on
8816 the previous behavior is not known to exist, and suspected to be
8818 * `'static` variables [may now be recursive][st].
8819 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
8820 implementations correctly.
8821 * The `dropck` rules, which checks that destructors can't access
8822 destroyed values, [have been updated][dropck] to match the
8828 * The [`Duration`] API, [has been stabilized][ds], as well as the
8829 `std::time` module, which presently contains only `Duration`.
8830 * `Box<str>` and `Box<[T]>` both implement `Clone`.
8831 * The owned C string, [`CString`], implements [`Borrow`] and the
8832 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
8833 these allow C strings to be borrowed and cloned in generic code.
8834 * [`CStr`] implements [`Debug`].
8835 * [`AtomicPtr`] implements [`Debug`].
8836 * [`Error`] trait objects [can be downcast to their concrete types][e]
8837 in many common configurations, using the [`is`], [`downcast`],
8838 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
8840 * Searching for substrings now [employs the two-way algorithm][search]
8841 instead of doing a naive search. This gives major speedups to a
8842 number of methods, including [`contains`][sc], [`find`][sf],
8843 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
8844 [`ends_with`][sew] are also faster.
8845 * The performance of `PartialEq` for slices is [much faster][ps].
8846 * The [`Hash`] trait offers the default method, [`hash_slice`], which
8847 is overridden and optimized by the implementations for scalars.
8848 * The [`Hasher`] trait now has a number of specialized `write_*`
8849 methods for primitive types, for efficiency.
8850 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
8851 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
8852 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
8853 of [`std::error::Error::cause`][iec] also delegates to the inner
8855 * [`process::Child`][pc] gained the [`id`] method, which returns a
8856 `u32` representing the platform-specific process identifier.
8857 * The [`connect`] method on slices is deprecated, replaced by the new
8858 [`join`] method (note that both of these are on the *unstable*
8859 [`SliceConcatExt`] trait, but through the magic of the prelude are
8860 available to stable code anyway).
8861 * The [`Div`] operator is implemented for [`Wrapping`] types.
8862 * [`DerefMut` is implemented for `String`][dms].
8863 * Performance of SipHash (the default hasher for `HashMap`) is
8864 [better for long data][sh].
8865 * [`AtomicPtr`] implements [`Send`].
8866 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
8867 are now [specialized to use uninitialized buffers for increased
8869 * Lifetime parameters of foreign functions [are now resolved
8875 * Rust can now, with some coercion, [produce programs that run on
8876 Windows XP][xp], though XP is not considered a supported platform.
8877 * Porting Rust on Windows from the GNU toolchain to MSVC continues
8878 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
8879 recommended for use in 1.3, though should be fully-functional
8880 in the [64-bit 1.4 beta][b14].
8881 * On Fedora-based systems installation will [properly configure the
8882 dynamic linker][fl].
8883 * The compiler gained many new extended error descriptions, which can
8884 be accessed with the `--explain` flag.
8885 * The `dropck` pass, which checks that destructors can't access
8886 destroyed values, [has been rewritten][27261]. This fixes some
8887 soundness holes, and as such will cause some previously-compiling
8888 code to no longer build.
8889 * `rustc` now uses [LLVM to write archive files where possible][ar].
8890 Eventually this will eliminate the compiler's dependency on the ar
8892 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
8893 supported FreeBSD on x86_64).
8894 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
8895 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
8897 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
8898 will kill the process instead of leaking][nlp].
8900 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
8901 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
8902 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
8903 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
8904 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
8905 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
8906 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
8907 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
8908 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
8909 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
8910 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
8911 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
8912 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
8913 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8914 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
8915 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
8916 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
8917 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
8918 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
8919 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
8920 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
8921 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
8922 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
8923 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
8924 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
8925 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
8926 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
8927 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
8928 [ar]: https://github.com/rust-lang/rust/pull/26926
8929 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
8930 [dms]: https://github.com/rust-lang/rust/pull/26241
8931 [27261]: https://github.com/rust-lang/rust/pull/27261
8932 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
8933 [ds]: https://github.com/rust-lang/rust/pull/26818
8934 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
8935 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
8936 [dst3]: https://github.com/rust-lang/rust/pull/27351
8937 [e]: https://github.com/rust-lang/rust/pull/24793
8938 [f]: https://github.com/rust-lang/rust/pull/26588
8939 [26959]: https://github.com/rust-lang/rust/pull/26959
8940 [fl]: https://github.com/rust-lang/rust-installer/pull/41
8941 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
8942 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
8943 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
8944 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
8945 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
8946 [lic]: https://github.com/rust-lang/rust/pull/26583
8947 [lnu]: https://github.com/rust-lang/rust/pull/27026
8948 [lr]: https://github.com/rust-lang/rust/issues/27248
8949 [lum]: https://github.com/rust-lang/rust/pull/26378
8950 [lur]: https://github.com/rust-lang/rust/pull/26783
8951 [nlp]: https://github.com/rust-lang/rust/pull/27176
8952 [nold2]: https://github.com/rust-lang/rust/pull/27045
8953 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
8954 [nom]: http://doc.rust-lang.org/nightly/nomicon/
8955 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
8956 [pi]: https://github.com/rust-lang/rust/pull/26699
8957 [ps]: https://github.com/rust-lang/rust/pull/26884
8958 [rte]: https://github.com/rust-lang/rust/pull/26950
8959 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
8960 [search]: https://github.com/rust-lang/rust/pull/26327
8961 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
8962 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
8963 [sh]: https://github.com/rust-lang/rust/pull/27280
8964 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
8965 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
8966 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
8967 [st]: https://github.com/rust-lang/rust/pull/26630
8968 [win1]: https://github.com/rust-lang/rust/pull/26569
8969 [win2]: https://github.com/rust-lang/rust/pull/26741
8970 [win3]: https://github.com/rust-lang/rust/pull/26741
8971 [win4]: https://github.com/rust-lang/rust/pull/27210
8972 [xp]: https://github.com/rust-lang/rust/pull/26569
8974 Version 1.2.0 (2015-08-07)
8975 ==========================
8977 * ~1200 changes, numerous bugfixes
8982 * [Dynamically-sized-type coercions][dst] allow smart pointer types
8983 like `Rc` to contain types without a fixed size, arrays and trait
8984 objects, finally enabling use of `Rc<[T]>` and completing the
8985 implementation of DST.
8986 * [Parallel codegen][parcodegen] is now working again, which can
8987 substantially speed up large builds in debug mode; It also gets
8988 another ~33% speedup when bootstrapping on a 4 core machine (using 8
8989 jobs). It's not enabled by default, but will be "in the near
8990 future". It can be activated with the `-C codegen-units=N` flag to
8992 * This is the first release with [experimental support for linking
8993 with the MSVC linker and lib C on Windows (instead of using the GNU
8994 variants via MinGW)][win]. It is yet recommended only for the most
8995 intrepid Rustaceans.
8996 * Benchmark compilations are showing a 30% improvement in
8997 bootstrapping over 1.1.
9002 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9003 unicode case mapping, which is a previously-planned change in
9004 behavior and considered a bugfix.
9005 * [`mem::align_of`] now specifies [the *minimum alignment* for
9006 T][align], which is usually the alignment programs are interested
9007 in, and the same value reported by clang's
9008 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9010 * [The `#[packed]` attribute is no longer silently accepted by the
9011 compiler][packed]. This attribute did nothing and code that
9012 mentioned it likely did not work as intended.
9013 * Associated type defaults are [now behind the
9014 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9015 defaults *did not work*, but could be mentioned syntactically. As
9016 such this breakage has minimal impact.
9021 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9022 matching against dereferenceable values.
9027 * The [`Extend`] trait, which grows a collection from an iterator, is
9028 implemented over iterators of references, for `String`, `Vec`,
9029 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9030 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9031 * The [`iter::once`] function returns an iterator that yields a single
9032 element, and [`iter::empty`] returns an iterator that yields no
9034 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9035 over substring matches.
9036 * [`Cell`] and [`RefCell`] both implement `Eq`.
9037 * A number of methods for wrapping arithmetic are added to the
9038 integral types, [`wrapping_div`], [`wrapping_rem`],
9039 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9040 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9041 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9042 type.. It is illegal for the default arithmetic operations in Rust
9043 to overflow; the desire to wrap must be explicit.
9044 * The `{:#?}` formatting specifier [displays the alternate,
9045 pretty-printed][debugfmt] form of the `Debug` formatter. This
9046 feature was actually introduced prior to 1.0 with little
9048 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9049 for writing data to formatted strings, similar to [`io::Write`].
9050 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9051 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9052 are used by code generators to emit implementations of [`Debug`].
9053 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9054 methods that convert case, following Unicode case mapping.
9055 * It is now easier to handle poisoned locks. The [`PoisonError`]
9056 type, returned by failing lock operations, exposes `into_inner`,
9057 `get_ref`, and `get_mut`, which all give access to the inner lock
9058 guard, and allow the poisoned lock to continue to operate. The
9059 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9060 poisoned lock without attempting to take the lock.
9061 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9062 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9063 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9064 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9066 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9072 * `rustc` employs smarter heuristics for guessing at [typos].
9073 * `rustc` emits more efficient code for [no-op conversions between
9074 unsafe pointers][nop].
9075 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9076 resulting in faster compile times and smaller code.
9078 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9079 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9080 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9081 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9082 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9083 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9084 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9085 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9086 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9087 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9088 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9089 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9090 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9091 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9092 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9093 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9094 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9095 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9096 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9097 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9098 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9099 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9100 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9101 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9102 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9103 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9104 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9105 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9106 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9107 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9108 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9109 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9110 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9111 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9112 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9113 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9114 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9115 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9116 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9117 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9118 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9119 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9120 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9121 [align]: https://github.com/rust-lang/rust/pull/25646
9122 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9123 [typos]: https://github.com/rust-lang/rust/pull/26087
9124 [nop]: https://github.com/rust-lang/rust/pull/26336
9125 [fat]: https://github.com/rust-lang/rust/pull/26411
9126 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9127 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9128 [packed]: https://github.com/rust-lang/rust/pull/25541
9129 [ad]: https://github.com/rust-lang/rust/pull/27382
9130 [win]: https://github.com/rust-lang/rust/pull/25350
9132 Version 1.1.0 (2015-06-25)
9133 =========================
9135 * ~850 changes, numerous bugfixes
9140 * The [`std::fs` module has been expanded][fs] to expand the set of
9141 functionality exposed:
9142 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9143 don't incur a syscall on some platforms.
9144 * A `symlink_metadata` function has been added.
9145 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9146 access to all underlying information.
9147 * The compiler now contains extended explanations of many errors. When an error
9148 with an explanation occurs the compiler suggests using the `--explain` flag
9149 to read the explanation. Error explanations are also [available online][err-index].
9150 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9151 well as other work, the time to bootstrap the compiler decreased by
9157 * The [`str::split_whitespace`] method splits a string on unicode
9158 whitespace boundaries.
9159 * On both Windows and Unix, new extension traits provide conversion of
9160 I/O types to and from the underlying system handles. On Unix, these
9161 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9162 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9163 `TcpListener`, and `UpdSocket`. Further implementations for
9164 `std::process` will be stabilized later.
9165 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9166 Windows, symlinks can be created with
9167 `std::os::windows::symlink_dir` and
9168 `std::os::windows::symlink_file`.
9169 * The `mpsc::Receiver` type can now be converted into an iterator with
9170 `into_iter` on the [`IntoIterator`] trait.
9171 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9172 implementation of the [`From`] trait.
9173 * The `Debug` implementation for `RangeFull` [creates output that is
9174 more consistent with other implementations][rf].
9175 * [`Debug` is implemented for `File`][file].
9176 * The `Default` implementation for `Arc` [no longer requires `Sync +
9178 * [The `Iterator` methods `count`, `nth`, and `last` have been
9179 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9180 * Incorrect handling of paths on Windows has been improved in both the
9181 compiler and the standard library.
9182 * [`AtomicPtr` gained a `Default` implementation][ap].
9183 * In accordance with Rust's policy on arithmetic overflow `abs` now
9184 [panics on overflow when debug assertions are enabled][abs].
9185 * The [`Cloned`] iterator, which was accidentally left unstable for
9186 1.0 [has been stabilized][c].
9187 * The [`Incoming`] iterator, which iterates over incoming TCP
9188 connections, and which was accidentally unnamable in 1.0, [is now
9189 properly exported][inc].
9190 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9191 `sift_up` or `sift_down` panic][bh].
9192 * The [`split_off`] method of `LinkedList` [no longer corrupts
9193 the list in certain scenarios][ll].
9198 * Type checking performance [has improved notably][sk] with
9199 [multiple improvements][pre].
9200 * The compiler [suggests code changes][ch] for more errors.
9201 * rustc and it's build system have experimental support for [building
9202 toolchains against MUSL][m] instead of glibc on Linux.
9203 * The compiler defines the `target_env` cfg value, which is used for
9204 distinguishing toolchains that are otherwise for the same
9205 platform. Presently this is set to `gnu` for common GNU Linux
9206 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9207 * The [`cargo rustc`][crc] command invokes a build with custom flags
9209 * [Android executables are always position independent][pie].
9210 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9211 with `Drop`][24935].
9213 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9214 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9215 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9216 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9217 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9218 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9219 [rf]: https://github.com/rust-lang/rust/pull/24491
9220 [err-index]: https://doc.rust-lang.org/error-index.html
9221 [sk]: https://github.com/rust-lang/rust/pull/24615
9222 [pre]: https://github.com/rust-lang/rust/pull/25323
9223 [file]: https://github.com/rust-lang/rust/pull/24598
9224 [ch]: https://github.com/rust-lang/rust/pull/24683
9225 [arc]: https://github.com/rust-lang/rust/pull/24695
9226 [si]: https://github.com/rust-lang/rust/pull/24701
9227 [ap]: https://github.com/rust-lang/rust/pull/24834
9228 [m]: https://github.com/rust-lang/rust/pull/24777
9229 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9230 [crc]: https://github.com/rust-lang/cargo/pull/1568
9231 [pie]: https://github.com/rust-lang/rust/pull/24953
9232 [abs]: https://github.com/rust-lang/rust/pull/25441
9233 [c]: https://github.com/rust-lang/rust/pull/25496
9234 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9235 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9236 [inc]: https://github.com/rust-lang/rust/pull/25522
9237 [bh]: https://github.com/rust-lang/rust/pull/25856
9238 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9239 [ll]: https://github.com/rust-lang/rust/pull/26022
9240 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9241 [24935]: https://github.com/rust-lang/rust/pull/24935
9243 Version 1.0.0 (2015-05-15)
9244 ========================
9246 * ~1500 changes, numerous bugfixes
9251 * The vast majority of the standard library is now `#[stable]`. It is
9252 no longer possible to use unstable features with a stable build of
9254 * Many popular crates on [crates.io] now work on the stable release
9256 * Arithmetic on basic integer types now [checks for overflow in debug
9262 * Several [restrictions have been added to trait coherence][coh] in
9263 order to make it easier for upstream authors to change traits
9264 without breaking downstream code.
9265 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9266 improve error messages and macro behavior. For example, `0b1234` is
9267 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9268 * Trait bounds [are always invariant][inv], eliminating the need for
9269 the `PhantomFn` and `MarkerTrait` lang items, which have been
9271 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9272 "foo" as bar` syntax has been replaced with `extern crate foo as
9273 bar`, and Cargo now automatically translates "-" in *package* names
9274 to underscore for the crate name.
9275 * [Lifetime shadowing is an error][lt].
9276 * [`Send` no longer implies `'static`][send-rfc].
9277 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9278 `MyType::default()`.
9279 * Primitive types [now have inherent methods][prim-inherent],
9280 obviating the need for extension traits like `SliceExt`.
9281 * Methods with `Self: Sized` in their `where` clause are [considered
9282 object-safe][self-sized], allowing many extension traits like
9283 `IteratorExt` to be merged into the traits they extended.
9284 * You can now [refer to associated types][assoc-where] whose
9285 corresponding trait bounds appear only in a `where` clause.
9286 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9287 like `Send` and `Sync` are now library-defined.
9288 * A [Reflect trait][reflect] was introduced, which means that
9289 downcasting via the `Any` trait is effectively limited to concrete
9290 types. This helps retain the potentially-important "parametricity"
9291 property: generic code cannot behave differently for different type
9292 arguments except in minor ways.
9293 * The `unsafe_destructor` feature is now deprecated in favor of the
9294 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9300 * The `thread_local` module [has been renamed to `std::thread`][th].
9301 * The methods of `IteratorExt` [have been moved to the `Iterator`
9302 trait itself][23300].
9303 * Several traits that implement Rust's conventions for type
9304 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9305 [centralized in the `std::convert` module][con].
9306 * The `FromError` trait [was removed in favor of `From`][fe].
9307 * The basic sleep function [has moved to
9308 `std::thread::sleep_ms`][slp].
9309 * The `splitn` function now takes an `n` parameter that represents the
9310 number of items yielded by the returned iterator [instead of the
9311 number of 'splits'][spl].
9312 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9313 * [Derived implementations of `PartialOrd` now order enums according
9314 to their explicitly-assigned discriminants][po].
9315 * [Methods for searching strings are generic over `Pattern`s][pat],
9316 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9318 * [In method resolution, object methods are resolved before inherent
9320 * [`String::from_str` has been deprecated in favor of the `From` impl,
9321 `String::from`][24517].
9322 * [`io::Error` implements `Sync`][ios].
9323 * [The `words` method on `&str` has been replaced with
9324 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9326 * The new path and IO modules are complete and `#[stable]`. This
9327 was the major library focus for this cycle.
9328 * The path API was [revised][path-normalize] to normalize `.`,
9329 adjusting the tradeoffs in favor of the most common usage.
9330 * A large number of remaining APIs in `std` were also stabilized
9331 during this cycle; about 75% of the non-deprecated API surface
9333 * The new [string pattern API][string-pattern] landed, which makes
9334 the string slice API much more internally consistent and flexible.
9335 * A new set of [generic conversion traits][conversion] replaced
9336 many existing ad hoc traits.
9337 * Generic numeric traits were [completely removed][num-traits]. This
9338 was made possible thanks to inherent methods for primitive types,
9339 and the removal gives maximal flexibility for designing a numeric
9340 hierarchy in the future.
9341 * The `Fn` traits are now related via [inheritance][fn-inherit]
9342 and provide ergonomic [blanket implementations][fn-blanket].
9343 * The `Index` and `IndexMut` traits were changed to
9344 [take the index by value][index-value], enabling code like
9345 `hash_map["string"]` to work.
9346 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9347 `Copy` data is known to be `Clone` as well.
9352 * Many errors now have extended explanations that can be accessed with
9353 the `--explain` flag to `rustc`.
9354 * Many new examples have been added to the standard library
9356 * rustdoc has received a number of improvements focused on completion
9358 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9359 * Much headway was made on ecosystem-wide CI, making it possible
9360 to [compare builds for breakage][ci-compare].
9363 [crates.io]: http://crates.io
9364 [clo]: https://github.com/rust-lang/rust/pull/24034
9365 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9366 [con]: https://github.com/rust-lang/rust/pull/23875
9367 [cr]: https://github.com/rust-lang/rust/pull/23419
9368 [fe]: https://github.com/rust-lang/rust/pull/23879
9369 [23300]: https://github.com/rust-lang/rust/pull/23300
9370 [inv]: https://github.com/rust-lang/rust/pull/23938
9371 [ios]: https://github.com/rust-lang/rust/pull/24133
9372 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9373 [lt]: https://github.com/rust-lang/rust/pull/24057
9374 [meth]: https://github.com/rust-lang/rust/pull/24056
9375 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9376 [po]: https://github.com/rust-lang/rust/pull/24270
9377 [24517]: https://github.com/rust-lang/rust/pull/24517
9378 [slp]: https://github.com/rust-lang/rust/pull/23949
9379 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9380 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9381 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9382 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9383 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9384 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9385 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9386 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9387 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9388 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9389 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9390 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9391 [reflect]: https://github.com/rust-lang/rust/pull/23712
9392 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9393 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9394 [index-value]: https://github.com/rust-lang/rust/pull/23601
9395 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9396 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9397 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9398 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9399 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9400 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9403 Version 1.0.0-alpha.2 (2015-02-20)
9404 =====================================
9406 * ~1300 changes, numerous bugfixes
9410 * The various I/O modules were [overhauled][io-rfc] to reduce
9411 unnecessary abstractions and provide better interoperation with
9412 the underlying platform. The old `io` module remains temporarily
9414 * The standard library now [participates in feature gating][feat],
9415 so use of unstable libraries now requires a `#![feature(...)]`
9416 attribute. The impact of this change is [described on the
9417 forum][feat-forum]. [RFC][feat-rfc].
9421 * `for` loops [now operate on the `IntoIterator` trait][into],
9422 which eliminates the need to call `.iter()`, etc. to iterate
9423 over collections. There are some new subtleties to remember
9424 though regarding what sort of iterators various types yield, in
9425 particular that `for foo in bar { }` yields values from a move
9426 iterator, destroying the original collection. [RFC][into-rfc].
9427 * Objects now have [default lifetime bounds][obj], so you don't
9428 have to write `Box<Trait+'static>` when you don't care about
9429 storing references. [RFC][obj-rfc].
9430 * In types that implement `Drop`, [lifetimes must outlive the
9431 value][drop]. This will soon make it possible to safely
9432 implement `Drop` for types where `#[unsafe_destructor]` is now
9433 required. Read the [gorgeous RFC][drop-rfc] for details.
9434 * The fully qualified <T as Trait>::X syntax lets you set the Self
9435 type for a trait method or associated type. [RFC][ufcs-rfc].
9436 * References to types that implement `Deref<U>` now [automatically
9437 coerce to references][deref] to the dereferenced type `U`,
9438 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9439 should eliminate many unsightly uses of `&*`, as when converting
9440 from references to vectors into references to
9441 slices. [RFC][deref-rfc].
9442 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9443 `|:|`) is obsolete and closure kind is inferred from context.
9444 * [`Self` is a keyword][Self].
9448 * The `Show` and `String` formatting traits [have been
9449 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9450 their related purposes. Automatically getting a string
9451 conversion to use with `format!("{:?}", something_to_debug)` is
9452 now written `#[derive(Debug)]`.
9453 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9454 OsStr}`, provide strings in platform-specific encodings for easier
9455 interop with system APIs. [RFC][osstr-rfc].
9456 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9457 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9458 creating raw pointers.
9462 * Certain long error messages of the form 'expected foo found bar'
9463 are now [split neatly across multiple
9464 lines][multiline]. Examples in the PR.
9465 * On Unix Rust can be [uninstalled][un] by running
9466 `/usr/local/lib/rustlib/uninstall.sh`.
9467 * The `#[rustc_on_unimplemented]` attribute, requiring the
9468 'on_unimplemented' feature, lets rustc [display custom error
9469 messages when a trait is expected to be implemented for a type
9474 * Rust is tested against a [LALR grammar][lalr], which parses
9475 almost all the Rust files that rustc does.
9477 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9478 [close]: https://github.com/rust-lang/rust/pull/21843
9479 [deref]: https://github.com/rust-lang/rust/pull/21351
9480 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9481 [drop]: https://github.com/rust-lang/rust/pull/21972
9482 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9483 [feat]: https://github.com/rust-lang/rust/pull/21248
9484 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9485 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9486 [fmt]: https://github.com/rust-lang/rust/pull/21457
9487 [into]: https://github.com/rust-lang/rust/pull/20790
9488 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9489 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9490 [lalr]: https://github.com/rust-lang/rust/pull/21452
9491 [multiline]: https://github.com/rust-lang/rust/pull/19870
9492 [obj]: https://github.com/rust-lang/rust/pull/22230
9493 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9494 [onun]: https://github.com/rust-lang/rust/pull/20889
9495 [osstr]: https://github.com/rust-lang/rust/pull/21488
9496 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9497 [Self]: https://github.com/rust-lang/rust/pull/22158
9498 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9499 [un]: https://github.com/rust-lang/rust/pull/22256
9502 Version 1.0.0-alpha (2015-01-09)
9503 ==================================
9505 * ~2400 changes, numerous bugfixes
9509 * The language itself is considered feature complete for 1.0,
9510 though there will be many usability improvements and bugfixes
9511 before the final release.
9512 * Nearly 50% of the public API surface of the standard library has
9513 been declared 'stable'. Those interfaces are unlikely to change
9515 * The long-running debate over integer types has been
9516 [settled][ints]: Rust will ship with types named `isize` and
9517 `usize`, rather than `int` and `uint`, for pointer-sized
9518 integers. Guidelines will be rolled out during the alpha cycle.
9519 * Most crates that are not `std` have been moved out of the Rust
9520 distribution into the Cargo ecosystem so they can evolve
9521 separately and don't need to be stabilized as quickly, including
9522 'time', 'getopts', 'num', 'regex', and 'term'.
9523 * Documentation continues to be expanded with more API coverage, more
9524 examples, and more in-depth explanations. The guides have been
9525 consolidated into [The Rust Programming Language][trpl].
9526 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9527 * All official Rust binary installers now come with [Cargo], the
9528 Rust package manager.
9532 * Closures have been [completely redesigned][unboxed] to be
9533 implemented in terms of traits, can now be used as generic type
9534 bounds and thus monomorphized and inlined, or via an opaque
9535 pointer (boxed) as in the old system. The new system is often
9536 referred to as 'unboxed' closures.
9537 * Traits now support [associated types][assoc], allowing families
9538 of related types to be defined together and used generically in
9540 * Enum variants are [namespaced by their type names][enum].
9541 * [`where` clauses][where] provide a more versatile and attractive
9542 syntax for specifying generic bounds, though the previous syntax
9544 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9546 * Rust [no longer has a runtime][rt] of any description, and only
9547 supports OS threads, not green threads.
9548 * At long last, Rust has been overhauled for 'dynamically-sized
9549 types' ([DST]), which integrates 'fat pointers' (object types,
9550 arrays, and `str`) more deeply into the type system, making it
9552 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9553 `..j` that produce range types and which, when combined with the
9554 `Index` operator and multidispatch, leads to a convenient slice
9556 * The new range syntax revealed an ambiguity in the fixed-length
9557 array syntax, so now fixed length arrays [are written `[T;
9559 * The `Copy` trait is no longer implemented automatically. Unsafe
9560 pointers no longer implement `Sync` and `Send` so types
9561 containing them don't automatically either. `Sync` and `Send`
9562 are now 'unsafe traits' so one can "forcibly" implement them via
9563 `unsafe impl` if a type confirms to the requirements for them
9564 even though the internals do not (e.g. structs containing unsafe
9565 pointers like `Arc`). These changes are intended to prevent some
9566 footguns and are collectively known as [opt-in built-in
9567 traits][oibit] (though `Sync` and `Send` will soon become pure
9568 library types unknown to the compiler).
9569 * Operator traits now take their operands [by value][ops], and
9570 comparison traits can use multidispatch to compare one type
9571 against multiple other types, allowing e.g. `String` to be
9572 compared with `&str`.
9573 * `if let` and `while let` are no longer feature-gated.
9574 * Rust has adopted a more [uniform syntax for escaping unicode
9575 characters][unicode].
9576 * `macro_rules!` [has been declared stable][mac]. Though it is a
9577 flawed system it is sufficiently popular that it must be usable
9578 for 1.0. Effort has gone into [future-proofing][mac-future] it
9579 in ways that will allow other macro systems to be developed in
9580 parallel, and won't otherwise impact the evolution of the
9582 * The prelude has been [pared back significantly][prelude] such
9583 that it is the minimum necessary to support the most pervasive
9584 code patterns, and through [generalized where clauses][where]
9585 many of the prelude extension traits have been consolidated.
9586 * Rust's rudimentary reflection [has been removed][refl], as it
9587 incurred too much code generation for little benefit.
9588 * [Struct variants][structvars] are no longer feature-gated.
9589 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9590 known as 'higher-ranked trait bounds', this crucially allows
9591 unboxed closures to work.
9592 * Macros invocations surrounded by parens or square brackets and
9593 not terminated by a semicolon are [parsed as
9594 expressions][macros], which makes expressions like `vec![1i32,
9595 2, 3].len()` work as expected.
9596 * Trait objects now implement their traits automatically, and
9597 traits that can be coerced to objects now must be [object
9599 * Automatically deriving traits is now done with `#[derive(...)]`
9600 not `#[deriving(...)]` for [consistency with other naming
9601 conventions][derive].
9602 * Importing the containing module or enum at the same time as
9603 items or variants they contain is [now done with `self` instead
9604 of `mod`][self], as in use `foo::{self, bar}`
9605 * Glob imports are no longer feature-gated.
9606 * The `box` operator and `box` patterns have been feature-gated
9607 pending a redesign. For now unique boxes should be allocated
9608 like other containers, with `Box::new`.
9612 * A [series][coll1] of [efforts][coll2] to establish
9613 [conventions][coll3] for collections types has resulted in API
9614 improvements throughout the standard library.
9615 * New [APIs for error handling][err] provide ergonomic interop
9616 between error types, and [new conventions][err-conv] describe
9617 more clearly the recommended error handling strategies in Rust.
9618 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9619 it is easier to discuss failure in the context of error handling
9620 without making clarifications as to whether you are referring to
9621 the 'fail' macro or failure more generally.
9622 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9623 syscall when available.
9624 * The 'serialize' crate has been renamed 'rustc-serialize' and
9625 moved out of the distribution to Cargo. Although it is widely
9626 used now, it is expected to be superseded in the near future.
9627 * The `Show` formatter, typically implemented with
9628 `#[derive(Show)]` is [now requested with the `{:?}`
9629 specifier][show] and is intended for use by all types, for uses
9630 such as `println!` debugging. The new `String` formatter must be
9631 implemented by hand, uses the `{}` specifier, and is intended
9632 for full-fidelity conversions of things that can logically be
9633 represented as strings.
9637 * [Flexible target specification][flex] allows rustc's code
9638 generation to be configured to support otherwise-unsupported
9640 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9641 respective debuggers with Rust-appropriate pretty-printing.
9642 * The Windows installation of Rust is distributed with the
9643 MinGW components currently required to link binaries on that
9648 * Nullable enum optimizations have been extended to more types so
9649 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9650 space than the inner types themselves.
9651 * Work has begun on supporting AArch64.
9653 [Cargo]: https://crates.io
9654 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9655 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9656 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9657 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9658 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9659 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9660 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9661 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9662 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9663 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9664 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9665 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9666 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9667 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9668 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9669 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9670 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9671 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9672 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9673 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9674 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9675 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9676 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9677 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9678 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9679 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9680 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9681 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9682 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9683 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9684 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9685 [trpl]: https://doc.rust-lang.org/book/index.html
9686 [rbe]: http://rustbyexample.com/
9689 Version 0.12.0 (2014-10-09)
9690 =============================
9692 * ~1900 changes, numerous bugfixes
9696 * The introductory documentation (now called The Rust Guide) has
9697 been completely rewritten, as have a number of supplementary
9699 * Rust's package manager, Cargo, continues to improve and is
9700 sometimes considered to be quite awesome.
9701 * Many API's in `std` have been reviewed and updated for
9702 consistency with the in-development Rust coding
9703 guidelines. The standard library documentation tracks
9704 stabilization progress.
9705 * Minor libraries have been moved out-of-tree to the rust-lang org
9706 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9707 be installed with Cargo.
9708 * Lifetime elision allows lifetime annotations to be left off of
9709 function declarations in many common scenarios.
9710 * Rust now works on 64-bit Windows.
9713 * Indexing can be overloaded with the `Index` and `IndexMut`
9715 * The `if let` construct takes a branch only if the `let` pattern
9716 matches, currently behind the 'if_let' feature gate.
9717 * 'where clauses', a more flexible syntax for specifying trait
9718 bounds that is more aesthetic, have been added for traits and
9719 free functions. Where clauses will in the future make it
9720 possible to constrain associated types, which would be
9721 impossible with the existing syntax.
9722 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9723 the 'slicing_syntax' feature gate, and can be overloaded with
9724 the `Slice` or `SliceMut` traits.
9725 * The syntax for matching of sub-slices has been changed to use a
9726 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9727 consistency with other uses of `..` and to future-proof
9728 potential additional uses of the syntax.
9729 * The syntax for matching inclusive ranges in patterns has changed
9730 from `0..3` to `0...4` to be consistent with the exclusive range
9732 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9733 c]`) has been put behind the 'advanced_slice_patterns' feature
9734 gate and may be removed in the future.
9735 * Components of tuples and tuple structs can be extracted using
9736 the `value.0` syntax, currently behind the `tuple_indexing`
9738 * The `#[crate_id]` attribute is no longer supported; versioning
9739 is handled by the package manager.
9740 * Renaming crate imports are now written `extern crate foo as bar`
9741 instead of `extern crate bar = foo`.
9742 * Renaming use statements are now written `use foo as bar` instead
9744 * `let` and `match` bindings and argument names in macros are now
9746 * The new, more efficient, closure types ('unboxed closures') have
9747 been added under a feature gate, 'unboxed_closures'. These will
9748 soon replace the existing closure types, once higher-ranked
9749 trait lifetimes are added to the language.
9750 * `move` has been added as a keyword, for indicating closures
9751 that capture by value.
9752 * Mutation and assignment is no longer allowed in pattern guards.
9753 * Generic structs and enums can now have trait bounds.
9754 * The `Share` trait is now called `Sync` to free up the term
9755 'shared' to refer to 'shared reference' (the default reference
9757 * Dynamically-sized types have been mostly implemented,
9758 unifying the behavior of fat-pointer types with the rest of the
9760 * As part of dynamically-sized types, the `Sized` trait has been
9761 introduced, which qualifying types implement by default, and
9762 which type parameters expect by default. To specify that a type
9763 parameter does not need to be sized, write `<Sized? T>`. Most
9764 types are `Sized`, notable exceptions being unsized arrays
9765 (`[T]`) and trait types.
9766 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9767 * Lifetime bounds can now be applied to type parameters and object
9769 * The old, reference counted GC type, `Gc<T>` which was once
9770 denoted by the `@` sigil, has finally been removed. GC will be
9771 revisited in the future.
9774 * Library documentation has been improved for a number of modules.
9775 * Bit-vectors, collections::bitv has been modernized.
9776 * The url crate is deprecated in favor of
9777 http://github.com/servo/rust-url, which can be installed with
9779 * Most I/O stream types can be cloned and subsequently closed from
9781 * A `std::time::Duration` type has been added for use in I/O
9782 methods that rely on timers, as well as in the 'time' crate's
9783 `Timespec` arithmetic.
9784 * The runtime I/O abstraction layer that enabled the green thread
9785 scheduler to do non-thread-blocking I/O has been removed, along
9786 with the libuv-based implementation employed by the green thread
9787 scheduler. This will greatly simplify the future I/O work.
9788 * `collections::btree` has been rewritten to have a more
9789 idiomatic and efficient design.
9792 * rustdoc output now indicates the stability levels of API's.
9793 * The `--crate-name` flag can specify the name of the crate
9794 being compiled, like `#[crate_name]`.
9795 * The `-C metadata` specifies additional metadata to hash into
9796 symbol names, and `-C extra-filename` specifies additional
9797 information to put into the output filename, for use by the
9798 package manager for versioning.
9799 * debug info generation has continued to improve and should be
9800 more reliable under both gdb and lldb.
9801 * rustc has experimental support for compiling in parallel
9802 using the `-C codegen-units` flag.
9803 * rustc no longer encodes rpath information into binaries by
9807 * Stack usage has been optimized with LLVM lifetime annotations.
9808 * Official Rust binaries on Linux are more compatible with older
9809 kernels and distributions, built on CentOS 5.10.
9812 Version 0.11.0 (2014-07-02)
9813 ==========================
9815 * ~1700 changes, numerous bugfixes
9818 * ~[T] has been removed from the language. This type is superseded by
9820 * ~str has been removed from the language. This type is superseded by
9822 * ~T has been removed from the language. This type is superseded by the
9824 * @T has been removed from the language. This type is superseded by the
9825 standard library's std::gc::Gc<T> type.
9826 * Struct fields are now all private by default.
9827 * Vector indices and shift amounts are both required to be a `uint`
9828 instead of any integral type.
9829 * Byte character, byte string, and raw byte string literals are now all
9830 supported by prefixing the normal literal with a `b`.
9831 * Multiple ABIs are no longer allowed in an ABI string
9832 * The syntax for lifetimes on closures/procedures has been tweaked
9833 slightly: `<'a>|A, B|: 'b + K -> T`
9834 * Floating point modulus has been removed from the language; however it
9835 is still provided by a library implementation.
9836 * Private enum variants are now disallowed.
9837 * The `priv` keyword has been removed from the language.
9838 * A closure can no longer be invoked through a &-pointer.
9839 * The `use foo, bar, baz;` syntax has been removed from the language.
9840 * The transmute intrinsic no longer works on type parameters.
9841 * Statics now allow blocks/items in their definition.
9842 * Trait bounds are separated from objects with + instead of : now.
9843 * Objects can no longer be read while they are mutably borrowed.
9844 * The address of a static is now marked as insignificant unless the
9845 #[inline(never)] attribute is placed it.
9846 * The #[unsafe_destructor] attribute is now behind a feature gate.
9847 * Struct literals are no longer allowed in ambiguous positions such as
9848 if, while, match, and for..in.
9849 * Declaration of lang items and intrinsics are now feature-gated by
9851 * Integral literals no longer default to `int`, and floating point
9852 literals no longer default to `f64`. Literals must be suffixed with an
9853 appropriate type if inference cannot determine the type of the
9855 * The Box<T> type is no longer implicitly borrowed to &mut T.
9856 * Procedures are now required to not capture borrowed references.
9859 * The standard library is now a "facade" over a number of underlying
9860 libraries. This means that development on the standard library should
9861 be speedier due to smaller crates, as well as a clearer line between
9863 * A new library, libcore, lives under the standard library's facade
9864 which is Rust's "0-assumption" library, suitable for embedded and
9865 kernel development for example.
9866 * A regex crate has been added to the standard distribution. This crate
9867 includes statically compiled regular expressions.
9868 * The unwrap/unwrap_err methods on Result require a Show bound for
9869 better error messages.
9870 * The return types of the std::comm primitives have been centralized
9871 around the Result type.
9872 * A number of I/O primitives have gained the ability to time out their
9874 * A number of I/O primitives have gained the ability to close their
9875 reading/writing halves to cancel pending operations.
9876 * Reverse iterator methods have been removed in favor of `rev()` on
9877 their forward-iteration counterparts.
9878 * A bitflags! macro has been added to enable easy interop with C and
9879 management of bit flags.
9880 * A debug_assert! macro is now provided which is disabled when
9881 `--cfg ndebug` is passed to the compiler.
9882 * A graphviz crate has been added for creating .dot files.
9883 * The std::cast module has been migrated into std::mem.
9884 * The std::local_data api has been migrated from freestanding functions
9885 to being based on methods.
9886 * The Pod trait has been renamed to Copy.
9887 * jemalloc has been added as the default allocator for types.
9888 * The API for allocating memory has been changed to use proper alignment
9889 and sized deallocation
9890 * Connecting a TcpStream or binding a TcpListener is now based on a
9891 string address and a u16 port. This allows connecting to a hostname as
9893 * The Reader trait now contains a core method, read_at_least(), which
9894 correctly handles many repeated 0-length reads.
9895 * The process-spawning API is now centered around a builder-style
9897 * The :? printing qualifier has been moved from the standard library to
9898 an external libdebug crate.
9899 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
9900 have been renamed to Eq/Ord.
9901 * The select/plural methods have been removed from format!. The escapes
9902 for { and } have also changed from \{ and \} to {{ and }},
9904 * The TaskBuilder API has been re-worked to be a true builder, and
9905 extension traits for spawning native/green tasks have been added.
9908 * All breaking changes to the language or libraries now have their
9909 commit message annotated with `[breaking-change]` to allow for easy
9910 discovery of breaking changes.
9911 * The compiler will now try to suggest how to annotate lifetimes if a
9912 lifetime-related error occurs.
9913 * Debug info continues to be improved greatly with general bug fixes and
9914 better support for situations like link time optimization (LTO).
9915 * Usage of syntax extensions when cross-compiling has been fixed.
9916 * Functionality equivalent to GCC & Clang's -ffunction-sections,
9917 -fdata-sections and --gc-sections has been enabled by default
9918 * The compiler is now stricter about where it will load module files
9919 from when a module is declared via `mod foo;`.
9920 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
9921 Syntax extensions are now discovered via a "plugin registrar" type
9922 which will be extended in the future to other various plugins.
9923 * Lints have been restructured to allow for dynamically loadable lints.
9924 * A number of rustdoc improvements:
9925 * The HTML output has been visually redesigned.
9926 * Markdown is now powered by hoedown instead of sundown.
9927 * Searching heuristics have been greatly improved.
9928 * The search index has been reduced in size by a great amount.
9929 * Cross-crate documentation via `pub use` has been greatly improved.
9930 * Primitive types are now hyperlinked and documented.
9931 * Documentation has been moved from static.rust-lang.org/doc to
9933 * A new sandbox, play.rust-lang.org, is available for running and
9934 sharing rust code examples on-line.
9935 * Unused attributes are now more robustly warned about.
9936 * The dead_code lint now warns about unused struct fields.
9937 * Cross-compiling to iOS is now supported.
9938 * Cross-compiling to mipsel is now supported.
9939 * Stability attributes are now inherited by default and no longer apply
9940 to intra-crate usage, only inter-crate usage.
9941 * Error message related to non-exhaustive match expressions have been
9945 Version 0.10 (2014-04-03)
9946 =========================
9948 * ~1500 changes, numerous bugfixes
9951 * A new RFC process is now in place for modifying the language.
9952 * Patterns with `@`-pointers have been removed from the language.
9953 * Patterns with unique vectors (`~[T]`) have been removed from the
9955 * Patterns with unique strings (`~str`) have been removed from the
9957 * `@str` has been removed from the language.
9958 * `@[T]` has been removed from the language.
9959 * `@self` has been removed from the language.
9960 * `@Trait` has been removed from the language.
9961 * Headers on `~` allocations which contain `@` boxes inside the type for
9962 reference counting have been removed.
9963 * The semantics around the lifetimes of temporary expressions have changed,
9964 see #3511 and #11585 for more information.
9965 * Cross-crate syntax extensions are now possible, but feature gated. See
9966 #11151 for more information. This includes both `macro_rules!` macros as
9967 well as syntax extensions such as `format!`.
9968 * New lint modes have been added, and older ones have been turned on to be
9970 * Unnecessary parentheses
9973 * Uppercase variables
9974 * Publicly visible private types
9975 * `#[deriving]` with raw pointers
9976 * Unsafe functions can no longer be coerced to closures.
9977 * Various obscure macros such as `log_syntax!` are now behind feature gates.
9978 * The `#[simd]` attribute is now behind a feature gate.
9979 * Visibility is no longer allowed on `extern crate` statements, and
9980 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
9981 * Trailing commas are now allowed in argument lists and tuple patterns.
9982 * The `do` keyword has been removed, it is now a reserved keyword.
9983 * Default type parameters have been implemented, but are feature gated.
9984 * Borrowed variables through captures in closures are now considered soundly.
9985 * `extern mod` is now `extern crate`
9986 * The `Freeze` trait has been removed.
9987 * The `Share` trait has been added for types that can be shared among
9989 * Labels in macros are now hygienic.
9990 * Expression/statement macro invocations can be delimited with `{}` now.
9991 * Treatment of types allowed in `static mut` locations has been tweaked.
9992 * The `*` and `.` operators are now overloadable through the `Deref` and
9994 * `~Trait` and `proc` no longer have `Send` bounds by default.
9995 * Partial type hints are now supported with the `_` type marker.
9996 * An `Unsafe` type was introduced for interior mutability. It is now
9997 considered undefined to transmute from `&T` to `&mut T` without using the
9999 * The #[linkage] attribute was implemented for extern statics/functions.
10000 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10001 * `Pod` was renamed to `Copy`.
10004 * The `libextra` library has been removed. It has now been decomposed into
10005 component libraries with smaller and more focused nuggets of
10006 functionality. The full list of libraries can be found on the
10007 documentation index page.
10008 * std: `std::condition` has been removed. All I/O errors are now propagated
10009 through the `Result` type. In order to assist with error handling, a
10010 `try!` macro for unwrapping errors with an early return and a lint for
10011 unused results has been added. See #12039 for more information.
10012 * std: The `vec` module has been renamed to `slice`.
10013 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10014 This will become the only growable vector in the future.
10015 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10016 are now found at `std::io::BufferedReader` instead of
10017 `std::io::buffered::BufferedReader`.
10018 * std: `print` and `println` are no longer in the prelude, the `print!` and
10019 `println!` macros are intended to be used instead.
10020 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10021 attempts to statically prevent cycles.
10022 * std: The standard distribution is adopting the policy of pushing failure
10023 to the user rather than failing in libraries. Many functions (such as
10024 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10025 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10026 deriving mode: `#[deriving(Show)]`.
10027 * std: `ToStr` is now implemented for all types implementing `Show`.
10028 * std: The formatting trait methods now take `&self` instead of `&T`
10029 * std: The `invert()` method on iterators has been renamed to `rev()`
10030 * std: `std::num` has seen a reduction in the genericity of its traits,
10031 consolidating functionality into a few core traits.
10032 * std: Backtraces are now printed on task failure if the environment
10033 variable `RUST_BACKTRACE` is present.
10034 * std: Naming conventions for iterators have been standardized. More details
10035 can be found on the wiki's style guide.
10036 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10037 still implement the function.
10038 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10039 * std: `assert_approx_eq!` has been removed
10040 * std: The `e` and `E` formatting specifiers for floats have been added to
10041 print them in exponential notation.
10042 * std: The `Times` trait has been removed
10043 * std: Indications of variance and opting out of builtin bounds is done
10044 through marker types in `std::kinds::marker` now
10045 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10046 `#[deriving(Hash)]` is now possible.
10047 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10048 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10049 * std: `Chan::new` is now `channel()`.
10050 * std: A new synchronous channel type has been implemented.
10051 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10052 * std: `hashmap` and `trie` have been moved to `libcollections`
10053 * std: `run` has been rolled into `io::process`
10054 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10055 * std: The equality and comparison traits have seen some reorganization.
10056 * std: `rand` has moved to `librand`.
10057 * std: `to_{lower,upper}case` has been implemented for `char`.
10058 * std: Logging has been moved to `liblog`.
10059 * collections: `HashMap` has been rewritten for higher performance and less
10061 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10062 it can be booted manually. The runtime guide has more information and
10064 * native: All I/O functionality except signals has been implemented.
10065 * green: Task spawning with `libgreen` has been optimized with stack caching
10066 and various trimming of code.
10067 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10068 * sync: The `extra::sync` module has been updated to modern rust (and moved
10069 to the `sync` library), tweaking and improving various interfaces while
10070 dropping redundant functionality.
10071 * sync: A new `Barrier` type has been added to the `sync` library.
10072 * sync: An efficient mutex for native and green tasks has been implemented.
10073 * serialize: The `base64` module has seen some improvement. It treats
10074 newlines better, has non-string error values, and has seen general
10076 * fourcc: A `fourcc!` macro was introduced
10077 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10078 hexadecimal literal.
10081 * `rustpkg` has been deprecated and removed from the main repository. Its
10082 replacement, `cargo`, is under development.
10083 * Nightly builds of rust are now available
10084 * The memory usage of rustc has been improved many times throughout this
10086 * The build process supports disabling rpath support for the rustc binary
10088 * Code generation has improved in some cases, giving more information to the
10089 LLVM optimization passes to enable more extensive optimizations.
10090 * Debuginfo compatibility with lldb on OSX has been restored.
10091 * The master branch is now gated on an android bot, making building for
10092 android much more reliable.
10093 * Output flags have been centralized into one `--emit` flag.
10094 * Crate type flags have been centralized into one `--crate-type` flag.
10095 * Codegen flags have been consolidated behind a `-C` flag.
10096 * Linking against outdated crates now has improved error messages.
10097 * Error messages with lifetimes will often suggest how to annotate the
10098 function to fix the error.
10099 * Many more types are documented in the standard library, and new guides
10101 * Many `rustdoc` improvements:
10102 * code blocks are syntax highlighted.
10103 * render standalone markdown files.
10104 * the --test flag tests all code blocks by default.
10105 * exported macros are displayed.
10106 * re-exported types have their documentation inlined at the location of the
10108 * search works across crates that have been rendered to the same output
10112 Version 0.9 (2014-01-09)
10113 ==========================
10115 * ~1800 changes, numerous bugfixes
10118 * The `float` type has been removed. Use `f32` or `f64` instead.
10119 * A new facility for enabling experimental features (feature gating) has
10120 been added, using the crate-level `#[feature(foo)]` attribute.
10121 * Managed boxes (@) are now behind a feature gate
10122 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10123 standard library's `Gc` or `Rc` types instead.
10124 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10125 * Jumping back to the top of a loop is now done with `continue` instead of
10127 * Strings can no longer be mutated through index assignment.
10128 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10129 hash delimiters, as in `r###"foo"###`.
10130 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10132 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10133 * `@fn`s have been removed.
10134 * `do` only works with procs in order to make it obvious what the cost
10136 * Single-element tuple-like structs can no longer be dereferenced to
10137 obtain the inner value. A more comprehensive solution for overloading
10138 the dereference operator will be provided in the future.
10139 * The `#[link(...)]` attribute has been replaced with
10140 `#[crate_id = "name#vers"]`.
10141 * Empty `impl`s must be terminated with empty braces and may not be
10142 terminated with a semicolon.
10143 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10144 no longer has any special meaning.
10145 * The old `fmt!` string formatting macro has been removed.
10146 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10147 `print!` and `println!`.
10148 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10149 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10150 `extern mod foo = "bar"` instead.
10151 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10152 * Macros can have attributes.
10153 * Macros can expand to items with attributes.
10154 * Macros can expand to multiple items.
10155 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10156 * Comments may be nested.
10157 * Values automatically coerce to trait objects they implement, without
10159 * Enum discriminants are no longer an entire word but as small as needed to
10160 contain all the variants. The `repr` attribute can be used to override
10161 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10162 `#[repr(C)]` to match C enums.
10163 * Non-string literals are not allowed in attributes (they never worked).
10164 * The FFI now supports variadic functions.
10165 * Octal numeric literals, as in `0o7777`.
10166 * The `concat!` syntax extension performs compile-time string concatenation.
10167 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10168 removed as Rust no longer uses segmented stacks.
10169 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10170 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10171 not `*`; ignoring remaining fields of a struct is also done with `..`,
10172 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10173 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10174 * `rustc` supports the "system" calling convention, which defaults to the
10175 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10177 * The `type_overflow` lint (default: warn) checks literals for overflow.
10178 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10179 * The `attribute_usage` lint (default: warn) warns about unknown
10181 * The `unknown_features` lint (default: warn) warns about unknown
10183 * The `dead_code` lint (default: warn) checks for dead code.
10184 * Rust libraries can be linked statically to one another
10185 * `#[link_args]` is behind the `link_args` feature gate.
10186 * Native libraries are now linked with `#[link(name = "foo")]`
10187 * Native libraries can be statically linked to a rust crate
10188 (`#[link(name = "foo", kind = "static")]`).
10189 * Native OS X frameworks are now officially supported
10190 (`#[link(name = "foo", kind = "framework")]`).
10191 * The `#[thread_local]` attribute creates thread-local (not task-local)
10192 variables. Currently behind the `thread_local` feature gate.
10193 * The `return` keyword may be used in closures.
10194 * Types that can be copied via a memcpy implement the `Pod` kind.
10195 * The `cfg` attribute can now be used on struct fields and enum variants.
10198 * std: The `option` and `result` API's have been overhauled to make them
10199 simpler, more consistent, and more composable.
10200 * std: The entire `std::io` module has been replaced with one that is
10201 more comprehensive and that properly interfaces with the underlying
10202 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10204 * std: `io::util` contains a number of useful implementations of
10205 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10206 `ZeroReader`, `TeeReader`.
10207 * std: The reference counted pointer type `extra::rc` moved into std.
10208 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10209 just a wrapper around it).
10210 * std: The `Either` type has been removed.
10211 * std: `fmt::Default` can be implemented for any type to provide default
10212 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10213 * std: The `rand` API continues to be tweaked.
10214 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10215 on failure in gdb, is now named `rust_fail`.
10216 * std: The `each_key` and `each_value` methods on `HashMap` have been
10217 replaced by the `keys` and `values` iterators.
10218 * std: Functions dealing with type size and alignment have moved from the
10219 `sys` module to the `mem` module.
10220 * std: The `path` module was written and API changed.
10221 * std: `str::from_utf8` has been changed to cast instead of allocate.
10222 * std: `starts_with` and `ends_with` methods added to vectors via the
10223 `ImmutableEqVector` trait, which is in the prelude.
10224 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10225 if the index is out of bounds.
10226 * std: Task failure no longer propagates between tasks, as the model was
10227 complex, expensive, and incompatible with thread-based tasks.
10228 * std: The `Any` type can be used for dynamic typing.
10229 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10231 * std: Methods that produce iterators generally do not have an `_iter`
10233 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10234 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10235 * std: `util::ignore` renamed to `prelude::drop`.
10236 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10238 * std: `vec::raw` has seen a lot of cleanup and API changes.
10239 * std: The standard library no longer includes any C++ code, and very
10240 minimal C, eliminating the dependency on libstdc++.
10241 * std: Runtime scheduling and I/O functionality has been factored out into
10242 extensible interfaces and is now implemented by two different crates:
10243 libnative, for native threading and I/O; and libgreen, for green threading
10244 and I/O. This paves the way for using the standard library in more limited
10245 embedded environments.
10246 * std: The `comm` module has been rewritten to be much faster, have a
10247 simpler, more consistent API, and to work for both native and green
10249 * std: All libuv dependencies have been moved into the rustuv crate.
10250 * native: New implementations of runtime scheduling on top of OS threads.
10251 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10253 * green: The green thread scheduler and message passing types are almost
10254 entirely lock-free.
10255 * extra: The `flatpipes` module had bitrotted and was removed.
10256 * extra: All crypto functions have been removed and Rust now has a policy of
10257 not reimplementing crypto in the standard library. In the future crypto
10258 will be provided by external crates with bindings to established libraries.
10259 * extra: `c_vec` has been modernized.
10260 * extra: The `sort` module has been removed. Use the `sort` method on
10264 * The `rust` and `rusti` commands have been removed, due to lack of
10266 * `rustdoc` was completely rewritten.
10267 * `rustdoc` can test code examples in documentation.
10268 * `rustpkg` can test packages with the argument, 'test'.
10269 * `rustpkg` supports arbitrary dependencies, including C libraries.
10270 * `rustc`'s support for generating debug info is improved again.
10271 * `rustc` has better error reporting for unbalanced delimiters.
10272 * `rustc`'s JIT support was removed due to bitrot.
10273 * Executables and static libraries can be built with LTO (-Z lto)
10274 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10278 Version 0.8 (2013-09-26)
10279 ============================
10281 * ~2200 changes, numerous bugfixes
10284 * The `for` loop syntax has changed to work with the `Iterator` trait.
10285 * At long last, unwinding works on Windows.
10286 * Default methods are ready for use.
10287 * Many trait inheritance bugs fixed.
10288 * Owned and borrowed trait objects work more reliably.
10289 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10290 * rustc can omit emission of code for the `debug!` macro if it is passed
10292 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10293 for foo.rs, then foo/mod.rs, and will generate an error when both are
10295 * Strings no longer contain trailing nulls. The new `std::c_str` module
10296 provides new mechanisms for converting to C strings.
10297 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10298 * The FFI has been overhauled such that foreign functions are called directly,
10299 instead of through a stack-switching wrapper.
10300 * Calling a foreign function must be done through a Rust function with the
10301 `#[fixed_stack_segment]` attribute.
10302 * The `externfn!` macro can be used to declare both a foreign function and
10303 a `#[fixed_stack_segment]` wrapper at once.
10304 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10305 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10306 * `priv` is disallowed everywhere except for struct fields and enum variants.
10307 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10308 * `ref` bindings in irrefutable patterns work correctly now.
10309 * `char` is now prevented from containing invalid code points.
10310 * Casting to `bool` is no longer allowed.
10311 * `\0` is now accepted as an escape in chars and strings.
10312 * `yield` is a reserved keyword.
10313 * `typeof` is a reserved keyword.
10314 * Crates may be imported by URL with `extern mod foo = "url";`.
10315 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10316 * Static vectors can be initialized with repeating elements,
10317 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10318 * Static structs can be initialized with functional record update,
10319 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10320 * `cfg!` can be used to conditionally execute code based on the crate
10321 configuration, similarly to `#[cfg(...)]`.
10322 * The `unnecessary_qualification` lint detects unneeded module
10323 prefixes (default: allow).
10324 * Arithmetic operations have been implemented on the SIMD types in
10325 `std::unstable::simd`.
10326 * Exchange allocation headers were removed, reducing memory usage.
10327 * `format!` implements a completely new, extensible, and higher-performance
10328 string formatting system. It will replace `fmt!`.
10329 * `print!` and `println!` write formatted strings (using the `format!`
10330 extension) to stdout.
10331 * `write!` and `writeln!` write formatted strings (using the `format!`
10332 extension) to the new Writers in `std::rt::io`.
10333 * The library section in which a function or static is placed may
10334 be specified with `#[link_section = "..."]`.
10335 * The `proto!` syntax extension for defining bounded message protocols
10337 * `macro_rules!` is hygienic for `let` declarations.
10338 * The `#[export_name]` attribute specifies the name of a symbol.
10339 * `unreachable!` can be used to indicate unreachable code, and fails
10343 * std: Transitioned to the new runtime, written in Rust.
10344 * std: Added an experimental I/O library, `rt::io`, based on the new
10346 * std: A new generic `range` function was added to the prelude, replacing
10347 `uint::range` and friends.
10348 * std: `range_rev` no longer exists. Since range is an iterator it can be
10349 reversed with `range(lo, hi).invert()`.
10350 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10351 renamed to `unwrap_or`.
10352 * std: The `iterator` module was renamed to `iter`.
10353 * std: Integral types now support the `checked_add`, `checked_sub`, and
10354 `checked_mul` operations for detecting overflow.
10355 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10357 * std: Methods are standardizing on conventions for casting methods:
10358 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10360 * std: The `CString` type in `c_str` provides new ways to convert to and
10362 * std: `DoubleEndedIterator` can yield elements in two directions.
10363 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10365 * std: `str::from_bytes` renamed to `str::from_utf8`.
10366 * std: `pop_opt` and `shift_opt` methods added to vectors.
10367 * std: The task-local data interface no longer uses @, and keys are
10368 no longer function pointers.
10369 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10370 * std: Added `SharedPort` to `comm`.
10371 * std: `Eq` has a default method for `ne`; only `eq` is required
10372 in implementations.
10373 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10374 is required in implementations.
10375 * std: `is_utf8` performance is improved, impacting many string functions.
10376 * std: `os::MemoryMap` provides cross-platform mmap.
10377 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10378 are not 'in-bounds' are considered undefined.
10379 * std: Many freestanding functions in `vec` removed in favor of methods.
10380 * std: Many freestanding functions on scalar types removed in favor of
10382 * std: Many options to task builders were removed since they don't make
10383 sense in the new scheduler design.
10384 * std: More containers implement `FromIterator` so can be created by the
10386 * std: More complete atomic types in `unstable::atomics`.
10387 * std: `comm::PortSet` removed.
10388 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10389 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10390 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10391 default implementations.
10392 * std: Various `from_str` functions were removed in favor of a generic
10393 `from_str` which is available in the prelude.
10394 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10395 * extra: `dlist`, the doubly-linked list was modernized.
10396 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10397 * extra: Added `glob` module, replacing `std::os::glob`.
10398 * extra: `rope` was removed.
10399 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10400 * extra: `net`, and `timer` were removed. The experimental replacements
10401 are `std::rt::io::net` and `std::rt::io::timer`.
10402 * extra: Iterators implemented for `SmallIntMap`.
10403 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10404 * extra: `SmallIntSet` removed. Use `BitvSet`.
10405 * extra: Performance of JSON parsing greatly improved.
10406 * extra: `semver` updated to SemVer 2.0.0.
10407 * extra: `term` handles more terminals correctly.
10408 * extra: `dbg` module removed.
10409 * extra: `par` module removed.
10410 * extra: `future` was cleaned up, with some method renames.
10411 * extra: Most free functions in `getopts` were converted to methods.
10414 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10415 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10416 similarly to gcc's `--march` flag.
10417 * rustc's performance compiling small crates is much better.
10418 * rustpkg has received many improvements.
10419 * rustpkg supports git tags as package IDs.
10420 * rustpkg builds into target-specific directories so it can be used for
10422 * The number of concurrent test tasks is controlled by the environment
10423 variable RUST_TEST_TASKS.
10424 * The test harness can now report metrics for benchmarks.
10425 * All tools have man pages.
10426 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10427 * The runtime uses jemalloc for allocations.
10428 * Segmented stacks are temporarily disabled as part of the transition to
10429 the new runtime. Stack overflows are possible!
10430 * A new documentation backend, rustdoc_ng, is available for use. It is
10431 still invoked through the normal `rustdoc` command.
10434 Version 0.7 (2013-07-03)
10435 =======================
10437 * ~2000 changes, numerous bugfixes
10440 * `impl`s no longer accept a visibility qualifier. Put them on methods
10442 * The borrow checker has been rewritten with flow-sensitivity, fixing
10443 many bugs and inconveniences.
10444 * The `self` parameter no longer implicitly means `&'self self`,
10445 and can be explicitly marked with a lifetime.
10446 * Overloadable compound operators (`+=`, etc.) have been temporarily
10447 removed due to bugs.
10448 * The `for` loop protocol now requires `for`-iterators to return `bool`
10449 so they compose better.
10450 * The `Durable` trait is replaced with the `'static` bounds.
10451 * Trait default methods work more often.
10452 * Structs with the `#[packed]` attribute have byte alignment and
10453 no padding between fields.
10454 * Type parameters bound by `Copy` must now be copied explicitly with
10455 the `copy` keyword.
10456 * It is now illegal to move out of a dereferenced unsafe pointer.
10457 * `Option<~T>` is now represented as a nullable pointer.
10458 * `@mut` does dynamic borrow checks correctly.
10459 * The `main` function is only detected at the topmost level of the crate.
10460 The `#[main]` attribute is still valid anywhere.
10461 * Struct fields may no longer be mutable. Use inherited mutability.
10462 * The `#[no_send]` attribute makes a type that would otherwise be
10464 * The `#[no_freeze]` attribute makes a type that would otherwise be
10466 * Unbounded recursion will abort the process after reaching the limit
10467 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10468 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10469 are never implicitly copyable.
10470 * `#[static_assert]` makes compile-time assertions about static bools.
10471 * At long last, 'argument modes' no longer exist.
10472 * The rarely used `use mod` statement no longer exists.
10474 * Syntax extensions
10475 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10477 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10478 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10479 `#[deriving(...)]`.
10480 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10481 and unsuffixed integer literals.
10484 * The `core` crate was renamed to `std`.
10485 * The `std` crate was renamed to `extra`.
10486 * More and improved documentation.
10487 * std: `iterator` module for external iterator objects.
10488 * Many old-style (internal, higher-order function) iterators replaced by
10489 implementations of `Iterator`.
10490 * std: Many old internal vector and string iterators,
10491 incl. `any`, `all`. removed.
10492 * std: The `finalize` method of `Drop` renamed to `drop`.
10493 * std: The `drop` method now takes `&mut self` instead of `&self`.
10494 * std: The prelude no longer re-exports any modules, only types and traits.
10495 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10496 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10497 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10498 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10499 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10500 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10501 * std: Many types implement `Clone`.
10502 * std: `path` type renamed to `Path`.
10503 * std: `mut` module and `Mut` type removed.
10504 * std: Many standalone functions removed in favor of methods and iterators
10505 in `vec`, `str`. In the future methods will also work as functions.
10506 * std: `reinterpret_cast` removed. Use `transmute`.
10507 * std: ascii string handling in `std::ascii`.
10508 * std: `Rand` is implemented for ~/@.
10509 * std: `run` module for spawning processes overhauled.
10510 * std: Various atomic types added to `unstable::atomic`.
10511 * std: Various types implement `Zero`.
10512 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10513 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10514 * std: Added `os::mkdir_recursive`.
10515 * std: Added `os::glob` function performs filesystems globs.
10516 * std: `FuzzyEq` renamed to `ApproxEq`.
10517 * std: `Map` now defines `pop` and `swap` methods.
10518 * std: `Cell` constructors converted to static methods.
10519 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10520 * extra: `flate` module moved from `std` to `extra`.
10521 * extra: `fileinput` module for iterating over a series of files.
10522 * extra: `Complex` number type and `complex` module.
10523 * extra: `Rational` number type and `rational` module.
10524 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10525 * extra: `term` uses terminfo now, is more correct.
10526 * extra: `arc` functions converted to methods.
10527 * extra: Implementation of fixed output size variations of SHA-2.
10530 * `unused_variables` lint mode for unused variables (default: warn).
10531 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10533 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10535 * `dead_assignment` lint mode for unread variables (default: warn).
10536 * `unnecessary_allocation` lint mode detects some heap allocations that are
10537 immediately borrowed so could be written without allocating (default: warn).
10538 * `missing_doc` lint mode (default: allow).
10539 * `unreachable_code` lint mode (default: warn).
10540 * The `rusti` command has been rewritten and a number of bugs addressed.
10541 * rustc outputs in color on more terminals.
10542 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10543 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10544 * Compiling with `-g` will make the binary record information about
10545 dynamic borrowcheck failures for debugging.
10546 * rustdoc has a nicer stylesheet.
10547 * Various improvements to rustdoc.
10548 * Improvements to rustpkg (see the detailed release notes).
10551 Version 0.6 (2013-04-03)
10552 ========================
10554 * ~2100 changes, numerous bugfixes
10557 * The self type parameter in traits is now spelled `Self`
10558 * The `self` parameter in trait and impl methods must now be explicitly
10559 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10560 * Static methods no longer require the `static` keyword and instead
10561 are distinguished by the lack of a `self` parameter
10562 * Replaced the `Durable` trait with the `'static` lifetime
10563 * The old closure type syntax with the trailing sigil has been
10564 removed in favor of the more consistent leading sigil
10565 * `super` is a keyword, and may be prefixed to paths
10566 * Trait bounds are separated with `+` instead of whitespace
10567 * Traits are implemented with `impl Trait for Type`
10568 instead of `impl Type: Trait`
10569 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10570 * The `export` keyword has finally been removed
10571 * The `move` keyword has been removed (see "Semantic changes")
10572 * The interior mutability qualifier on vectors, `[mut T]`, has been
10573 removed. Use `&mut [T]`, etc.
10574 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10575 * `fail` is no longer a keyword. Use `fail!()`
10576 * `assert` is no longer a keyword. Use `assert!()`
10577 * `log` is no longer a keyword. use `debug!`, etc.
10578 * 1-tuples may be represented as `(T,)`
10579 * Struct fields may no longer be `mut`. Use inherited mutability,
10580 `@mut T`, `core::mut` or `core::cell`
10581 * `extern mod { ... }` is no longer valid syntax for foreign
10582 function modules. Use extern blocks: `extern { ... }`
10583 * Newtype enums removed. Use tuple-structs.
10584 * Trait implementations no longer support visibility modifiers
10585 * Pattern matching over vectors improved and expanded
10586 * `const` renamed to `static` to correspond to lifetime name,
10587 and make room for future `static mut` unsafe mutable globals.
10588 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10589 * `Clone` implementations can be automatically generated with
10590 `#[deriving(Clone)]`
10591 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10592 instead of `foo as Bar`.
10593 * Fixed length vector types are now written as `[int, .. 3]`
10594 instead of `[int * 3]`.
10595 * Fixed length vector types can express the length as a constant
10596 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10599 * Types with owned pointers or custom destructors move by default,
10600 eliminating the `move` keyword
10601 * All foreign functions are considered unsafe
10602 * &mut is now unaliasable
10603 * Writes to borrowed @mut pointers are prevented dynamically
10605 * The name of the main function can be customized using #[main]
10606 * The default type of an inferred closure is &fn instead of @fn
10607 * `use` statements may no longer be "chained" - they cannot import
10608 identifiers imported by previous `use` statements
10609 * `use` statements are crate relative, importing from the "top"
10610 of the crate by default. Paths may be prefixed with `super::`
10611 or `self::` to change the search behavior.
10612 * Method visibility is inherited from the implementation declaration
10613 * Structural records have been removed
10614 * Many more types can be used in static items, including enums
10615 'static-lifetime pointers and vectors
10616 * Pattern matching over vectors improved and expanded
10617 * Typechecking of closure types has been overhauled to
10618 improve inference and eliminate unsoundness
10619 * Macros leave scope at the end of modules, unless that module is
10620 tagged with #[macro_escape]
10623 * Added big integers to `std::bigint`
10624 * Removed `core::oldcomm` module
10625 * Added pipe-based `core::comm` module
10626 * Numeric traits have been reorganized under `core::num`
10627 * `vec::slice` finally returns a slice
10628 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10629 * Containers reorganized around traits in `core::container`
10630 * `core::dvec` removed, `~[T]` is a drop-in replacement
10631 * `core::send_map` renamed to `core::hashmap`
10632 * `std::map` removed; replaced with `core::hashmap`
10633 * `std::treemap` reimplemented as an owned balanced tree
10634 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10635 * `core::trie` added as a fast ordered map for integer keys
10636 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10637 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10638 overload the comparison operators, whereas `TotalOrd` is used
10639 by certain container types
10642 * Replaced the 'cargo' package manager with 'rustpkg'
10643 * Added all-purpose 'rust' tool
10644 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10645 * rustc now *attempts* to offer spelling suggestions
10646 * Improved support for ARM and Android
10647 * Preliminary MIPS backend
10648 * Improved foreign function ABI implementation for x86, x86_64
10649 * Various memory usage improvements
10650 * Rust code may be embedded in foreign code under limited circumstances
10651 * Inline assembler supported by new asm!() syntax extension.
10654 Version 0.5 (2012-12-21)
10655 ===========================
10657 * ~900 changes, numerous bugfixes
10660 * Removed `<-` move operator
10661 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10662 * Removed old fixed length vector syntax - `[T]/N`
10663 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10664 * Macros may now expand to items and statements
10665 * `a.b()` is always parsed as a method call, never as a field projection
10666 * `Eq` and `IterBytes` implementations can be automatically generated
10667 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10668 * Removed the special crate language for `.rc` files
10669 * Function arguments may consist of any irrefutable pattern
10672 * `&` and `~` pointers may point to objects
10673 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10674 * Enum variants may be structs
10675 * Destructors can be added to all nominal types with the Drop trait
10676 * Structs and nullary enum variants may be constants
10677 * Values that cannot be implicitly copied are now automatically moved
10678 without writing `move` explicitly
10679 * `&T` may now be coerced to `*T`
10680 * Coercions happen in `let` statements as well as function calls
10681 * `use` statements now take crate-relative paths
10682 * The module and type namespaces have been merged so that static
10683 method names can be resolved under the trait in which they are
10686 * Improved support for language features
10687 * Trait inheritance works in many scenarios
10688 * More support for explicit self arguments in methods - `self`, `&self`
10689 `@self`, and `~self` all generally work as expected
10690 * Static methods work in more situations
10691 * Experimental: Traits may declare default methods for the implementations
10695 * New condition handling system in `core::condition`
10696 * Timsort added to `std::sort`
10697 * New priority queue, `std::priority_queue`
10698 * Pipes for serializable types, `std::flatpipes'
10699 * Serialization overhauled to be trait-based
10700 * Expanded `getopts` definitions
10701 * Moved futures to `std`
10702 * More functions are pure now
10703 * `core::comm` renamed to `oldcomm`. Still deprecated
10704 * `rustdoc` and `cargo` are libraries now
10707 * Added a preliminary REPL, `rusti`
10708 * License changed from MIT to dual MIT/APL2
10711 Version 0.4 (2012-10-15)
10712 ==========================
10714 * ~2000 changes, numerous bugfixes
10717 * All keywords are now strict and may not be used as identifiers anywhere
10718 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10719 'of', 'with', 'to', 'class'.
10720 * Classes are replaced with simpler structs
10721 * Explicit method self types
10722 * `ret` became `return` and `alt` became `match`
10723 * `import` is now `use`; `use is now `extern mod`
10724 * `extern mod { ... }` is now `extern { ... }`
10725 * `use mod` is the recommended way to import modules
10726 * `pub` and `priv` replace deprecated export lists
10727 * The syntax of `match` pattern arms now uses fat arrow (=>)
10728 * `main` no longer accepts an args vector; use `os::args` instead
10731 * Trait implementations are now coherent, ala Haskell typeclasses
10732 * Trait methods may be static
10733 * Argument modes are deprecated
10734 * Borrowed pointers are much more mature and recommended for use
10735 * Strings and vectors in the static region are stored in constant memory
10736 * Typestate was removed
10737 * Resolution rewritten to be more reliable
10738 * Support for 'dual-mode' data structures (freezing and thawing)
10741 * Most binary operators can now be overloaded via the traits in
10743 * `std::net::url` for representing URLs
10744 * Sendable hash maps in `core::send_map`
10745 * `core::task' gained a (currently unsafe) task-local storage API
10748 * An efficient new intertask communication primitive called the pipe,
10749 along with a number of higher-level channel types, in `core::pipes`
10750 * `std::arc`, an atomically reference counted, immutable, shared memory
10752 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10753 * Futures are now based on pipes and sendable
10754 * More robust linked task failure
10755 * Improved task builder API
10758 * Improved error reporting
10759 * Preliminary JIT support
10760 * Preliminary work on precise GC
10761 * Extensive architectural improvements to rustc
10762 * Begun a transition away from buggy C++-based reflection (shape) code to
10763 Rust-based (visitor) code
10764 * All hash functions and tables converted to secure, randomized SipHash
10767 Version 0.3 (2012-07-12)
10768 ========================
10770 * ~1900 changes, numerous bugfixes
10772 * New coding conveniences
10773 * Integer-literal suffix inference
10774 * Per-item control over warnings, errors
10775 * #[cfg(windows)] and #[cfg(unix)] attributes
10776 * Documentation comments
10777 * More compact closure syntax
10778 * 'do' expressions for treating higher-order functions as
10780 * *-patterns (wildcard extended to all constructor fields)
10783 * Name resolution pass and exhaustiveness checker rewritten
10784 * Region pointers and borrow checking supersede alias
10786 * Init-ness checking is now provided by a region-based liveness
10787 pass instead of the typestate pass; same for last-use analysis
10788 * Extensive work on region pointers
10790 * Experimental new language features
10791 * Slices and fixed-size, interior-allocated vectors
10792 * #!-comments for lang versioning, shell execution
10793 * Destructors and iface implementation for classes;
10794 type-parameterized classes and class methods
10795 * 'const' type kind for types that can be used to implement
10796 shared-memory concurrency patterns
10800 * Removal of various obsolete features
10801 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
10802 'crust', 'native' (now 'extern'), 'cont' (now 'again')
10804 * Constructs: do-while loops ('do' repurposed), fn binding,
10805 resources (replaced by destructors)
10807 * Compiler reorganization
10808 * Syntax-layer of compiler split into separate crate
10809 * Clang (from LLVM project) integrated into build
10810 * Typechecker split into sub-modules
10813 * New time functions
10814 * Extension methods for many built-in types
10815 * Arc: atomic-refcount read-only / exclusive-use shared cells
10816 * Par: parallel map and search routines
10817 * Extensive work on libuv interface
10818 * Much vector code moved to libraries
10819 * Syntax extensions: #line, #col, #file, #mod, #stringify,
10820 #include, #include_str, #include_bin
10822 * Tool improvements
10823 * Cargo automatically resolves dependencies
10826 Version 0.2 (2012-03-29)
10827 =========================
10829 * >1500 changes, numerous bugfixes
10831 * New docs and doc tooling
10833 * New port: FreeBSD x86_64
10835 * Compilation model enhancements
10836 * Generics now specialized, multiply instantiated
10837 * Functions now inlined across separate crates
10839 * Scheduling, stack and threading fixes
10840 * Noticeably improved message-passing performance
10841 * Explicit schedulers
10845 * Experimental new language features
10846 * Operator overloading
10850 * Various language extensions
10851 * C-callback function types: 'crust fn ...'
10852 * Infinite-loop construct: 'loop { ... }'
10853 * Shorten 'mutable' to 'mut'
10854 * Required mutable-local qualifier: 'let mut ...'
10855 * Basic glob-exporting: 'export foo::*;'
10856 * Alt now exhaustive, 'alt check' for runtime-checked
10857 * Block-function form of 'for' loop, with 'break' and 'ret'.
10860 * AST quasi-quote syntax extension
10861 * Revived libuv interface
10862 * New modules: core::{future, iter}, std::arena
10863 * Merged per-platform std::{os*, fs*} to core::{libc, os}
10864 * Extensive cleanup, regularization in libstd, libcore
10867 Version 0.1 (2012-01-20)
10868 ===============================
10870 * Most language features work, including:
10871 * Unique pointers, unique closures, move semantics
10872 * Interface-constrained generics
10873 * Static interface dispatch
10875 * Multithread task scheduling
10876 * Typestate predicates
10877 * Failure unwinding, destructors
10878 * Pattern matching and destructuring assignment
10879 * Lightweight block-lambda syntax
10880 * Preliminary macro-by-example
10882 * Compiler works with the following configurations:
10883 * Linux: x86 and x86_64 hosts and targets
10884 * macOS: x86 and x86_64 hosts and targets
10885 * Windows: x86 hosts and targets
10887 * Cross compilation / multi-target configuration supported.
10889 * Preliminary API-documentation and package-management tools included.
10893 * Documentation is incomplete.
10895 * Performance is below intended target.
10897 * Standard library APIs are subject to extensive change, reorganization.
10899 * Language-level versioning is not yet operational - future code will
10900 break unexpectedly.