1 Version 1.59.0 (2022-02-24)
2 ==========================
7 - [Stabilize default arguments for const parameters and remove the ordering restriction for type and const parameters][90207]
8 - [Stabilize destructuring assignment][90521]
9 - [Relax private in public lint on generic bounds and where clauses of trait impls][90586]
10 - [Stabilize asm! and global_asm! for x86, x86_64, ARM, Aarch64, and RISC-V][91728]
15 - [Stabilize new symbol mangling format, leaving it opt-in (-Csymbol-mangling-version=v0)][90128]
16 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
17 - [Fix sparc64 ABI for aggregates with floating point members][91003]
18 - [Warn when a `#[test]`-like built-in attribute macro is present multiple times.][91172]
19 - [Add support for riscv64gc-unknown-freebsd][91284]
20 - [Stabilize `-Z emit-future-incompat` as `--json future-incompat`][91535]
21 - [Soft disable incremental compilation][94124]
23 This release disables incremental compilation, unless the user has explicitly
24 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
25 This is due to a known and relatively frequently occurring bug in incremental
26 compilation, which causes builds to issue internal compiler errors. This
27 particular bug is already fixed on nightly, but that fix has not yet rolled out
28 to stable and is deemed too risky for a direct stable backport.
30 As always, we encourage users to test with nightly and report bugs so that we
31 can track failures and fix issues earlier.
33 See [94124] for more details.
35 [94124]: https://github.com/rust-lang/rust/issues/94124
40 - [Remove unnecessary bounds for some Hash{Map,Set} methods][91593]
45 - [`std::thread::available_parallelism`][available_parallelism]
46 - [`Result::copied`][result-copied]
47 - [`Result::cloned`][result-cloned]
49 - [`arch::global_asm!`][global_asm]
50 - [`ops::ControlFlow::is_break`][is_break]
51 - [`ops::ControlFlow::is_continue`][is_continue]
52 - [`TryFrom<char> for u8`][try_from_char_u8]
53 - [`char::TryFromCharError`][try_from_char_err]
54 implementing `Clone`, `Debug`, `Display`, `PartialEq`, `Copy`, `Eq`, `Error`
56 - [`NonZeroU8::is_power_of_two`][is_power_of_two8]
57 - [`NonZeroU16::is_power_of_two`][is_power_of_two16]
58 - [`NonZeroU32::is_power_of_two`][is_power_of_two32]
59 - [`NonZeroU64::is_power_of_two`][is_power_of_two64]
60 - [`NonZeroU128::is_power_of_two`][is_power_of_two128]
61 - [`NonZeroUsize::is_power_of_two`][is_power_of_two_usize]
62 - [`DoubleEndedIterator for ToLowercase`][lowercase]
63 - [`DoubleEndedIterator for ToUppercase`][uppercase]
64 - [`TryFrom<&mut [T]> for [T; N]`][tryfrom_ref_arr]
65 - [`UnwindSafe for Once`][unwindsafe_once]
66 - [`RefUnwindSafe for Once`][refunwindsafe_once]
67 - [armv8 neon intrinsics for aarch64][stdarch/1266]
71 - [`mem::MaybeUninit::as_ptr`][muninit_ptr]
72 - [`mem::MaybeUninit::assume_init`][muninit_init]
73 - [`mem::MaybeUninit::assume_init_ref`][muninit_init_ref]
74 - [`ffi::CStr::from_bytes_with_nul_unchecked`][cstr_from_bytes]
79 - [Stabilize the `strip` profile option][cargo/10088]
80 - [Stabilize future-incompat-report][cargo/10165]
81 - [Support abbreviating `--release` as `-r`][cargo/10133]
82 - [Support `term.quiet` configuration][cargo/10152]
83 - [Remove `--host` from cargo {publish,search,login}][cargo/10145]
88 - [Refactor weak symbols in std::sys::unix][90846]
89 This may add new, versioned, symbols when building with a newer glibc, as the
90 standard library uses weak linkage rather than dynamically attempting to load
91 certain symbols at runtime.
92 - [Deprecate crate_type and crate_name nested inside `#![cfg_attr]`][83744]
93 This adds a future compatibility lint to supporting the use of cfg_attr
94 wrapping either crate_type or crate_name specification within Rust files;
95 it is recommended that users migrate to setting the equivalent command line
97 - [Remove effect of `#[no_link]` attribute on name resolution][92034]
98 This may expose new names, leading to conflicts with preexisting names in a
99 given namespace and a compilation failure.
100 - [Cargo will document libraries before binaries.][cargo/10172]
101 - [Respect doc=false in dependencies, not just the root crate][cargo/10201]
102 - [Weaken guarantee around advancing underlying iterators in zip][83791]
103 - [Make split_inclusive() on an empty slice yield an empty output][89825]
104 - [Update std::env::temp_dir to use GetTempPath2 on Windows when available.][89999]
105 - [unreachable! was updated to match other formatting macro behavior on Rust 2021][92137]
110 These changes provide no direct user facing benefits, but represent significant
111 improvements to the internals and overall performance of rustc
114 - [Fix many cases of normalization-related ICEs][91255]
115 - [Replace dominators algorithm with simple Lengauer-Tarjan][85013]
116 - [Store liveness in interval sets for region inference][90637]
118 - [Remove `in_band_lifetimes` from the compiler and standard library, in preparation for removing this
119 unstable feature.][91867]
121 [91867]: https://github.com/rust-lang/rust/issues/91867
122 [83744]: https://github.com/rust-lang/rust/pull/83744/
123 [83791]: https://github.com/rust-lang/rust/pull/83791/
124 [85013]: https://github.com/rust-lang/rust/pull/85013/
125 [89825]: https://github.com/rust-lang/rust/pull/89825/
126 [89999]: https://github.com/rust-lang/rust/pull/89999/
127 [90128]: https://github.com/rust-lang/rust/pull/90128/
128 [90207]: https://github.com/rust-lang/rust/pull/90207/
129 [90521]: https://github.com/rust-lang/rust/pull/90521/
130 [90586]: https://github.com/rust-lang/rust/pull/90586/
131 [90637]: https://github.com/rust-lang/rust/pull/90637/
132 [90833]: https://github.com/rust-lang/rust/pull/90833/
133 [90846]: https://github.com/rust-lang/rust/pull/90846/
134 [91003]: https://github.com/rust-lang/rust/pull/91003/
135 [91172]: https://github.com/rust-lang/rust/pull/91172/
136 [91255]: https://github.com/rust-lang/rust/pull/91255/
137 [91284]: https://github.com/rust-lang/rust/pull/91284/
138 [91535]: https://github.com/rust-lang/rust/pull/91535/
139 [91593]: https://github.com/rust-lang/rust/pull/91593/
140 [91728]: https://github.com/rust-lang/rust/pull/91728/
141 [91878]: https://github.com/rust-lang/rust/pull/91878/
142 [91896]: https://github.com/rust-lang/rust/pull/91896/
143 [91926]: https://github.com/rust-lang/rust/pull/91926/
144 [91984]: https://github.com/rust-lang/rust/pull/91984/
145 [92020]: https://github.com/rust-lang/rust/pull/92020/
146 [92034]: https://github.com/rust-lang/rust/pull/92034/
147 [92137]: https://github.com/rust-lang/rust/pull/92137/
148 [92483]: https://github.com/rust-lang/rust/pull/92483/
149 [cargo/10088]: https://github.com/rust-lang/cargo/pull/10088/
150 [cargo/10133]: https://github.com/rust-lang/cargo/pull/10133/
151 [cargo/10145]: https://github.com/rust-lang/cargo/pull/10145/
152 [cargo/10152]: https://github.com/rust-lang/cargo/pull/10152/
153 [cargo/10165]: https://github.com/rust-lang/cargo/pull/10165/
154 [cargo/10172]: https://github.com/rust-lang/cargo/pull/10172/
155 [cargo/10201]: https://github.com/rust-lang/cargo/pull/10201/
156 [cargo/10269]: https://github.com/rust-lang/cargo/pull/10269/
158 [cstr_from_bytes]: https://doc.rust-lang.org/stable/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked
159 [muninit_ptr]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
160 [muninit_init]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
161 [muninit_init_ref]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
162 [unwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-UnwindSafe
163 [refunwindsafe_once]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#impl-RefUnwindSafe
164 [tryfrom_ref_arr]: https://doc.rust-lang.org/stable/std/convert/trait.TryFrom.html#impl-TryFrom%3C%26%27_%20mut%20%5BT%5D%3E
165 [lowercase]: https://doc.rust-lang.org/stable/std/char/struct.ToLowercase.html#impl-DoubleEndedIterator
166 [uppercase]: https://doc.rust-lang.org/stable/std/char/struct.ToUppercase.html#impl-DoubleEndedIterator
167 [try_from_char_err]: https://doc.rust-lang.org/stable/std/char/struct.TryFromCharError.html
168 [available_parallelism]: https://doc.rust-lang.org/stable/std/thread/fn.available_parallelism.html
169 [result-copied]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.copied
170 [result-cloned]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.cloned
171 [asm]: https://doc.rust-lang.org/stable/core/arch/macro.asm.html
172 [global_asm]: https://doc.rust-lang.org/stable/core/arch/macro.global_asm.html
173 [is_break]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_break
174 [is_continue]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html#method.is_continue
175 [try_from_char_u8]: https://doc.rust-lang.org/stable/std/primitive.char.html#impl-TryFrom%3Cchar%3E
176 [zip]: https://doc.rust-lang.org/stable/std/iter/fn.zip.html
177 [is_power_of_two8]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU8.html#method.is_power_of_two
178 [is_power_of_two16]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU16.html#method.is_power_of_two
179 [is_power_of_two32]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU32.html#method.is_power_of_two
180 [is_power_of_two64]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU64.html#method.is_power_of_two
181 [is_power_of_two128]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroU128.html#method.is_power_of_two
182 [is_power_of_two_usize]: https://doc.rust-lang.org/stable/core/num/struct.NonZeroUsize.html#method.is_power_of_two
183 [stdarch/1266]: https://github.com/rust-lang/stdarch/pull/1266
185 Version 1.58.1 (2022-01-19)
186 ===========================
188 * Fix race condition in `std::fs::remove_dir_all` ([CVE-2022-21658])
189 * [Handle captured arguments in the `useless_format` Clippy lint][clippy/8295]
190 * [Move `non_send_fields_in_send_ty` Clippy lint to nursery][clippy/8075]
191 * [Fix wrong error message displayed when some imports are missing][91254]
192 * [Fix rustfmt not formatting generated files from stdin][92912]
194 [CVE-2022-21658]: https://www.cve.org/CVERecord?id=CVE-2022-21658
195 [91254]: https://github.com/rust-lang/rust/pull/91254
196 [92912]: https://github.com/rust-lang/rust/pull/92912
197 [clippy/8075]: https://github.com/rust-lang/rust-clippy/pull/8075
198 [clippy/8295]: https://github.com/rust-lang/rust-clippy/pull/8295
200 Version 1.58.0 (2022-01-13)
201 ==========================
206 - [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.
207 - [`*const T` pointers can now be dereferenced in const contexts.][89551]
208 - [The rules for when a generic struct implements `Unsize` have been relaxed.][90417]
213 - [Add LLVM CFI support to the Rust compiler][89652]
214 - [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.
215 - [Add support for LLVM coverage mapping format versions 5 and 6][91207]
216 - [Emit LLVM optimization remarks when enabled with `-Cremark`][90833]
217 - [Update the minimum external LLVM to 12][90175]
218 - [Add `x86_64-unknown-none` at Tier 3*][89062]
219 - [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.
220 - [Don't abort compilation after giving a lint error][87337]
221 - [Error messages point at the source of trait bound obligations in more places][89580]
223 \* Refer to Rust's [platform support page][platform-support-doc] for more
224 information on Rust's tiered platform support.
229 - [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.
230 - [Paths are automatically canonicalized on Windows for operations that support it][89174]
231 - [Re-enable debug checks for `copy` and `copy_nonoverlapping`][90041]
232 - [Implement `RefUnwindSafe` for `Rc<T>`][87467]
233 - [Make RSplit<T, P>: Clone not require T: Clone][90117]
234 - [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).
239 - [`Metadata::is_symlink`]
240 - [`Path::is_symlink`]
241 - [`{integer}::saturating_div`]
242 - [`Option::unwrap_unchecked`]
243 - [`Result::unwrap_unchecked`]
244 - [`Result::unwrap_err_unchecked`]
247 These APIs are now usable in const contexts:
250 - [`Duration::checked_add`]
251 - [`Duration::saturating_add`]
252 - [`Duration::checked_sub`]
253 - [`Duration::saturating_sub`]
254 - [`Duration::checked_mul`]
255 - [`Duration::saturating_mul`]
256 - [`Duration::checked_div`]
261 - [Add --message-format for install command][cargo/10107]
262 - [Warn when alias shadows external subcommand][cargo/10082]
267 - [Show all Deref implementations recursively in rustdoc][90183]
268 - [Use computed visibility in rustdoc][88447]
273 - [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.
274 - Windows: [`std::process::Command` will no longer search the current directory for executables.][87704]
275 - [All proc-macro backward-compatibility lints are now deny-by-default.][88041]
276 - [proc_macro: Append .0 to unsuffixed float if it would otherwise become int token][90297]
277 - [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.
278 - [rustdoc now rejects some unexpected semicolons in doctests][91026]
283 These changes provide no direct user facing benefits, but represent significant
284 improvements to the internals and overall performance of rustc
287 - [Implement coherence checks for negative trait impls][90104]
288 - [Add rustc lint, warning when iterating over hashmaps][89558]
289 - [Optimize live point computation][90491]
290 - [Enable verification for 1/32nd of queries loaded from disk][90361]
291 - [Implement version of normalize_erasing_regions that allows for normalization failure][91255]
293 [87337]: https://github.com/rust-lang/rust/pull/87337/
294 [87467]: https://github.com/rust-lang/rust/pull/87467/
295 [87704]: https://github.com/rust-lang/rust/pull/87704/
296 [88041]: https://github.com/rust-lang/rust/pull/88041/
297 [88447]: https://github.com/rust-lang/rust/pull/88447/
298 [88601]: https://github.com/rust-lang/rust/pull/88601/
299 [89062]: https://github.com/rust-lang/rust/pull/89062/
300 [89174]: https://github.com/rust-lang/rust/pull/89174/
301 [89551]: https://github.com/rust-lang/rust/pull/89551/
302 [89558]: https://github.com/rust-lang/rust/pull/89558/
303 [89580]: https://github.com/rust-lang/rust/pull/89580/
304 [89652]: https://github.com/rust-lang/rust/pull/89652/
305 [90041]: https://github.com/rust-lang/rust/pull/90041/
306 [90058]: https://github.com/rust-lang/rust/pull/90058/
307 [90104]: https://github.com/rust-lang/rust/pull/90104/
308 [90117]: https://github.com/rust-lang/rust/pull/90117/
309 [90175]: https://github.com/rust-lang/rust/pull/90175/
310 [90183]: https://github.com/rust-lang/rust/pull/90183/
311 [90297]: https://github.com/rust-lang/rust/pull/90297/
312 [90329]: https://github.com/rust-lang/rust/pull/90329/
313 [90361]: https://github.com/rust-lang/rust/pull/90361/
314 [90417]: https://github.com/rust-lang/rust/pull/90417/
315 [90473]: https://github.com/rust-lang/rust/pull/90473/
316 [90491]: https://github.com/rust-lang/rust/pull/90491/
317 [90733]: https://github.com/rust-lang/rust/pull/90733/
318 [90833]: https://github.com/rust-lang/rust/pull/90833/
319 [90846]: https://github.com/rust-lang/rust/pull/90846/
320 [91026]: https://github.com/rust-lang/rust/pull/91026/
321 [91207]: https://github.com/rust-lang/rust/pull/91207/
322 [91255]: https://github.com/rust-lang/rust/pull/91255/
323 [cargo/10082]: https://github.com/rust-lang/cargo/pull/10082/
324 [cargo/10107]: https://github.com/rust-lang/cargo/pull/10107/
325 [`Metadata::is_symlink`]: https://doc.rust-lang.org/stable/std/fs/struct.Metadata.html#method.is_symlink
326 [`Path::is_symlink`]: https://doc.rust-lang.org/stable/std/path/struct.Path.html#method.is_symlink
327 [`{integer}::saturating_div`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.saturating_div
328 [`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
329 [`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
330 [`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
331 [`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
332 [`Duration::new`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.new
334 Version 1.57.0 (2021-12-02)
335 ==========================
340 - [Macro attributes may follow `#[derive]` and will see the original (pre-`cfg`) input.][87220]
341 - [Accept curly-brace macros in expressions, like `m!{ .. }.method()` and `m!{ .. }?`.][88690]
342 - [Allow panicking in constant evaluation.][89508]
343 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
348 - [Create more accurate debuginfo for vtables.][89597]
349 - [Add `armv6k-nintendo-3ds` at Tier 3\*.][88529]
350 - [Add `armv7-unknown-linux-uclibceabihf` at Tier 3\*.][88952]
351 - [Add `m68k-unknown-linux-gnu` at Tier 3\*.][88321]
352 - [Add SOLID targets at Tier 3\*:][86191] `aarch64-kmc-solid_asp3`, `armv7a-kmc-solid_asp3-eabi`, `armv7a-kmc-solid_asp3-eabihf`
354 \* Refer to Rust's [platform support page][platform-support-doc] for more
355 information on Rust's tiered platform support.
360 - [Avoid allocations and copying in `Vec::leak`][89337]
361 - [Add `#[repr(i8)]` to `Ordering`][89507]
362 - [Optimize `File::read_to_end` and `read_to_string`][89582]
363 - [Update to Unicode 14.0][89614]
364 - [Many more functions are marked `#[must_use]`][89692], producing a warning
365 when ignoring their return value. This helps catch mistakes such as expecting
366 a function to mutate a value in place rather than return a new value.
371 - [`[T; N]::as_mut_slice`][`array::as_mut_slice`]
372 - [`[T; N]::as_slice`][`array::as_slice`]
373 - [`collections::TryReserveError`]
374 - [`HashMap::try_reserve`]
375 - [`HashSet::try_reserve`]
376 - [`String::try_reserve`]
377 - [`String::try_reserve_exact`]
378 - [`Vec::try_reserve`]
379 - [`Vec::try_reserve_exact`]
380 - [`VecDeque::try_reserve`]
381 - [`VecDeque::try_reserve_exact`]
382 - [`Iterator::map_while`]
384 - [`proc_macro::is_available`]
385 - [`Command::get_program`]
386 - [`Command::get_args`]
387 - [`Command::get_envs`]
388 - [`Command::get_current_dir`]
392 These APIs are now usable in const contexts:
394 - [`hint::unreachable_unchecked`]
399 - [Stabilize custom profiles][cargo/9943]
404 - [Ignore derived `Clone` and `Debug` implementations during dead code analysis.][85200]
405 This will break some builds that set `#![deny(dead_code)]`.
409 These changes provide no direct user facing benefits, but represent significant
410 improvements to the internals and overall performance of rustc
413 - [Added an experimental backend for codegen with `libgccjit`.][87260]
415 [85200]: https://github.com/rust-lang/rust/pull/85200/
416 [86191]: https://github.com/rust-lang/rust/pull/86191/
417 [87220]: https://github.com/rust-lang/rust/pull/87220/
418 [87260]: https://github.com/rust-lang/rust/pull/87260/
419 [88321]: https://github.com/rust-lang/rust/pull/88321/
420 [88529]: https://github.com/rust-lang/rust/pull/88529/
421 [88690]: https://github.com/rust-lang/rust/pull/88690/
422 [88952]: https://github.com/rust-lang/rust/pull/88952/
423 [89337]: https://github.com/rust-lang/rust/pull/89337/
424 [89507]: https://github.com/rust-lang/rust/pull/89507/
425 [89508]: https://github.com/rust-lang/rust/pull/89508/
426 [89582]: https://github.com/rust-lang/rust/pull/89582/
427 [89597]: https://github.com/rust-lang/rust/pull/89597/
428 [89614]: https://github.com/rust-lang/rust/pull/89614/
429 [89692]: https://github.com/rust-lang/rust/issues/89692/
430 [cargo/9943]: https://github.com/rust-lang/cargo/pull/9943/
431 [`array::as_mut_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_mut_slice
432 [`array::as_slice`]: https://doc.rust-lang.org/std/primitive.array.html#method.as_slice
433 [`collections::TryReserveError`]: https://doc.rust-lang.org/std/collections/struct.TryReserveError.html
434 [`HashMap::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.try_reserve
435 [`HashSet::try_reserve`]: https://doc.rust-lang.org/std/collections/hash_set/struct.HashSet.html#method.try_reserve
436 [`String::try_reserve`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve
437 [`String::try_reserve_exact`]: https://doc.rust-lang.org/alloc/string/struct.String.html#method.try_reserve_exact
438 [`Vec::try_reserve`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve
439 [`Vec::try_reserve_exact`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.try_reserve_exact
440 [`VecDeque::try_reserve`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve
441 [`VecDeque::try_reserve_exact`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.try_reserve_exact
442 [`Iterator::map_while`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.map_while
443 [`iter::MapWhile`]: https://doc.rust-lang.org/std/iter/struct.MapWhile.html
444 [`proc_macro::is_available`]: https://doc.rust-lang.org/proc_macro/fn.is_available.html
445 [`Command::get_program`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_program
446 [`Command::get_args`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_args
447 [`Command::get_envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_envs
448 [`Command::get_current_dir`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.get_current_dir
449 [`CommandArgs`]: https://doc.rust-lang.org/std/process/struct.CommandArgs.html
450 [`CommandEnvs`]: https://doc.rust-lang.org/std/process/struct.CommandEnvs.html
452 Version 1.56.1 (2021-11-01)
453 ===========================
455 - New lints to detect the presence of bidirectional-override Unicode
456 codepoints in the compiled source code ([CVE-2021-42574])
458 [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574
460 Version 1.56.0 (2021-10-21)
461 ========================
466 - [The 2021 Edition is now stable.][rust#88100]
467 See [the edition guide][rust-2021-edition-guide] for more details.
468 - [The pattern in `binding @ pattern` can now also introduce new bindings.][rust#85305]
469 - [Union field access is permitted in `const fn`.][rust#85769]
471 [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html
476 - [Upgrade to LLVM 13.][rust#87570]
477 - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023]
478 - [Allow specifying a deployment target version for all iOS targets][rust#87699]
479 - [Warnings can be forced on with `--force-warn`.][rust#87472]
480 This feature is primarily intended for usage by `cargo fix`, rather than end users.
481 - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760]
482 - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370]
483 - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666]
485 \* Refer to Rust's [platform support page][platform-support-doc] for more
486 information on Rust's tiered platform support.
491 - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.][rust#83342]
492 The Windows console still requires valid Unicode, but this change allows
493 splitting a UTF-8 character across multiple write calls. This allows, for
494 instance, programs that just read and write data buffers (e.g. copying a file
495 to stdout) without regard for Unicode or character boundaries.
496 - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.][rust#83093]
497 For this use case, atomics scale much better under contention.
498 - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835]
499 - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744]
500 - [`impl From<[(K, V); N]>` for all collections.][rust#84111]
501 - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363]
502 - [Treat invalid environment variable names as non-existent.][rust#86183]
503 Previously, the environment functions would panic if given a variable name
504 with an internal null character or equal sign (`=`). Now, these functions will
505 just treat such names as non-existent variables, since the OS cannot represent
506 the existence of a variable with such a name.
511 - [`std::os::unix::fs::chroot`]
512 - [`UnsafeCell::raw_get`]
513 - [`BufWriter::into_parts`]
514 - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]
515 These APIs were previously stable in `std`, but are now also available in `core`.
517 - [`String::shrink_to`]
518 - [`OsString::shrink_to`]
519 - [`PathBuf::shrink_to`]
520 - [`BinaryHeap::shrink_to`]
521 - [`VecDeque::shrink_to`]
522 - [`HashMap::shrink_to`]
523 - [`HashSet::shrink_to`]
525 These APIs are now usable in const contexts:
527 - [`std::mem::transmute`]
528 - [`[T]::first`][`slice::first`]
529 - [`[T]::split_first`][`slice::split_first`]
530 - [`[T]::last`][`slice::last`]
531 - [`[T]::split_last`][`slice::split_last`]
536 - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.][`rust-version`]
537 This has no effect at present on dependency version selection.
538 We encourage crates to specify their minimum supported Rust version, and we encourage CI systems
539 that support Rust code to include a crate's specified minimum version in the test matrix for that
545 - [Update to new argument parsing rules on Windows.][rust#87580]
546 This adjusts Rust's standard library to match the behavior of the standard
547 libraries for C/C++. The rules have changed slightly over time, and this PR
548 brings us to the latest set of rules (changed in 2008).
549 - [Disallow the aapcs calling convention on aarch64][rust#88399]
550 This was already not supported by LLVM; this change surfaces this lack of
551 support with a better error message.
552 - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385]
553 - [Warn when an escaped newline skips multiple lines.][rust#87671]
554 - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec`
555 may return different values on glibc <= 2.24.][rust#81825]
556 Rust now invokes the `clone3` system call directly, when available, to use new functionality
557 available via that system call. Older versions of glibc cache the result of `getpid`, and only
558 update that cache when calling glibc's clone/fork functions, so a direct system call bypasses
559 that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason.
563 These changes provide no direct user facing benefits, but represent significant
564 improvements to the internals and overall performance of rustc
567 - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069]
568 This improves the performance of most Rust builds.
569 - [Unify representation of macros in internal data structures.][rust#88019]
570 This change fixes a host of bugs with the handling of macros by the compiler,
573 [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html
574 [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get
575 [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts
576 [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: https://github.com/rust-lang/rust/pull/84662
577 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to
578 [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to
579 [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to
580 [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to
581 [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to
582 [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to
583 [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to
584 [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to
585 [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html
586 [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first
587 [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first
588 [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last
589 [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last
590 [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field
591 [rust#87671]: https://github.com/rust-lang/rust/pull/87671
592 [rust#86183]: https://github.com/rust-lang/rust/pull/86183
593 [rust#87385]: https://github.com/rust-lang/rust/pull/87385
594 [rust#88100]: https://github.com/rust-lang/rust/pull/88100
595 [rust#85305]: https://github.com/rust-lang/rust/pull/85305
596 [rust#88069]: https://github.com/rust-lang/rust/pull/88069
597 [rust#87472]: https://github.com/rust-lang/rust/pull/87472
598 [rust#87699]: https://github.com/rust-lang/rust/pull/87699
599 [rust#87570]: https://github.com/rust-lang/rust/pull/87570
600 [rust#88023]: https://github.com/rust-lang/rust/pull/88023
601 [rust#87760]: https://github.com/rust-lang/rust/pull/87760
602 [rust#87370]: https://github.com/rust-lang/rust/pull/87370
603 [rust#87580]: https://github.com/rust-lang/rust/pull/87580
604 [rust#83342]: https://github.com/rust-lang/rust/pull/83342
605 [rust#83093]: https://github.com/rust-lang/rust/pull/83093
606 [rust#85835]: https://github.com/rust-lang/rust/pull/85835
607 [rust#86744]: https://github.com/rust-lang/rust/pull/86744
608 [rust#81363]: https://github.com/rust-lang/rust/pull/81363
609 [rust#84111]: https://github.com/rust-lang/rust/pull/84111
610 [rust#85769]: https://github.com/rust-lang/rust/pull/85769#issuecomment-854363720
611 [rust#88399]: https://github.com/rust-lang/rust/pull/88399
612 [rust#81825]: https://github.com/rust-lang/rust/pull/81825#issuecomment-808406918
613 [rust#88019]: https://github.com/rust-lang/rust/pull/88019
614 [rust#87666]: https://github.com/rust-lang/rust/pull/87666
616 Version 1.55.0 (2021-09-09)
617 ============================
621 - [You can now write open "from" range patterns (`X..`), which will start at `X` and
622 will end at the maximum value of the integer.][83918]
623 - [You can now explicitly import the prelude of different editions
624 through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294]
628 - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572]
630 \* Refer to Rust's [platform support page][platform-support-doc] for more
631 information on Rust's tiered platform support.
636 - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761]
637 These improvements should in general provide faster string parsing of floats,
638 no longer reject certain valid floating point values, and reduce
639 the produced code size for non-stripped artifacts.
640 - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858]
647 - [`IntoInnerError::into_error`]
648 - [`IntoInnerError::into_parts`]
649 - [`MaybeUninit::assume_init_mut`]
650 - [`MaybeUninit::assume_init_ref`]
651 - [`MaybeUninit::write`]
653 - [`ops::ControlFlow`]
655 - [`x86::_bittestandcomplement`]
656 - [`x86::_bittestandreset`]
657 - [`x86::_bittestandset`]
658 - [`x86_64::_bittest64`]
659 - [`x86_64::_bittestandcomplement64`]
660 - [`x86_64::_bittestandreset64`]
661 - [`x86_64::_bittestandset64`]
663 The following previously stable functions are now `const`.
665 - [`str::from_utf8_unchecked`]
670 - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking
671 rustc in parallel such as when using `cargo test`.][cargo/9675]
672 - [The package definition in `cargo metadata` now includes the `"default_run"`
673 field from the manifest.][cargo/9550]
674 - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680]
675 - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"`
676 of packages.][cargo/9663]
680 - [Added "Go to item on exact match" search option.][85876]
681 - [The "Implementors" section on traits no longer shows redundant
682 method definitions.][85970]
683 - [Trait implementations are toggled open by default.][86260] This should make the
684 implementations more searchable by tools like `CTRL+F` in your browser.
685 - [Intra-doc links should now correctly resolve associated items (e.g. methods)
686 through type aliases.][86334]
687 - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the
688 "Trait Implementations" section.][86513]
693 - [std functions that return an `io::Error` will no longer use the
694 `ErrorKind::Other` variant.][85746] This is to better reflect that these
695 kinds of errors could be categorised [into newer more specific `ErrorKind`
696 variants][79965], and that they do not represent a user error.
697 - [Using environment variable names with `process::Command` on Windows now
698 behaves as expected.][85270] Previously using envionment variables with
699 `Command` would cause them to be ASCII-uppercased.
700 - [Rustdoc will now warn on using rustdoc lints that aren't prefixed
701 with `rustdoc::`][86849]
702 - `RUSTFLAGS` is no longer set for build scripts. Build scripts
703 should use `CARGO_ENCODED_RUSTFLAGS` instead. See the
704 [documentation](https://doc.rust-lang.org/nightly/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts)
707 [86849]: https://github.com/rust-lang/rust/pull/86849
708 [86513]: https://github.com/rust-lang/rust/pull/86513
709 [86334]: https://github.com/rust-lang/rust/pull/86334
710 [86260]: https://github.com/rust-lang/rust/pull/86260
711 [85970]: https://github.com/rust-lang/rust/pull/85970
712 [85876]: https://github.com/rust-lang/rust/pull/85876
713 [83572]: https://github.com/rust-lang/rust/pull/83572
714 [86294]: https://github.com/rust-lang/rust/pull/86294
715 [86858]: https://github.com/rust-lang/rust/pull/86858
716 [86761]: https://github.com/rust-lang/rust/pull/86761
717 [85746]: https://github.com/rust-lang/rust/pull/85746
718 [85270]: https://github.com/rust-lang/rust/pull/85270
719 [83918]: https://github.com/rust-lang/rust/pull/83918
720 [79965]: https://github.com/rust-lang/rust/pull/79965
721 [cargo/9663]: https://github.com/rust-lang/cargo/pull/9663
722 [cargo/9675]: https://github.com/rust-lang/cargo/pull/9675
723 [cargo/9550]: https://github.com/rust-lang/cargo/pull/9550
724 [cargo/9680]: https://github.com/rust-lang/cargo/pull/9680
725 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map
726 [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned
727 [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str
728 [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error
729 [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts
730 [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut
731 [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref
732 [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write
733 [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html
734 [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html
735 [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html
736 [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html
737 [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html
738 [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html
739 [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html
740 [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html
741 [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html
742 [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html
745 Version 1.54.0 (2021-07-29)
746 ============================
749 -----------------------
751 - [You can now use macros for values in some built-in attributes.][83366]
752 This primarily allows you to call macros within the `#[doc]` attribute. For
753 example, to include external documentation in your crate, you can now write
756 #![doc = include_str!("README.md")]
759 - [You can now cast between unsized slice types (and types which contain
760 unsized slices) in `const fn`.][85078]
761 - [You can now use multiple generic lifetimes with `impl Trait` where the
762 lifetimes don't explicitly outlive another.][84701] In code this means
763 that you can now have `impl Trait<'a, 'b>` where as before you could
764 only have `impl Trait<'a, 'b> where 'b: 'a`.
767 -----------------------
769 - [Rustc will now search for custom JSON targets in
770 `/lib/rustlib/<target-triple>/target.json` where `/` is the "sysroot"
771 directory.][83800] You can find your sysroot directory by running
772 `rustc --print sysroot`.
773 - [Added `wasm` as a `target_family` for WebAssembly platforms.][84072]
774 - [You can now use `#[target_feature]` on safe functions when targeting
775 WebAssembly platforms.][84988]
776 - [Improved debugger output for enums on Windows MSVC platforms.][85292]
777 - [Added tier 3\* support for `bpfel-unknown-none`
778 and `bpfeb-unknown-none`.][79608]
779 - [`-Zmutable-noalias=yes`][82834] is enabled by default when using LLVM 12 or above.
781 \* Refer to Rust's [platform support page][platform-support-doc] for more
782 information on Rust's tiered platform support.
785 -----------------------
787 - [`panic::panic_any` will now `#[track_caller]`.][85745]
788 - [Added `OutOfMemory` as a variant of `io::ErrorKind`.][84744]
789 - [ `proc_macro::Literal` now implements `FromStr`.][84717]
790 - [The implementations of vendor intrinsics in core::arch have been
791 significantly refactored.][83278] The main user-visible changes are
792 a 50% reduction in the size of libcore.rlib and stricter validation
793 of constant operands passed to intrinsics. The latter is technically
794 a breaking change, but allows Rust to more closely match the C vendor
800 - [`BTreeMap::into_keys`]
801 - [`BTreeMap::into_values`]
802 - [`HashMap::into_keys`]
803 - [`HashMap::into_values`]
805 - [`VecDeque::binary_search`]
806 - [`VecDeque::binary_search_by`]
807 - [`VecDeque::binary_search_by_key`]
808 - [`VecDeque::partition_point`]
813 - [Added the `--prune <spec>` option to `cargo-tree` to remove a package from
814 the dependency graph.][cargo/9520]
815 - [Added the `--depth` option to `cargo-tree` to print only to a certain depth
816 in the tree ][cargo/9499]
817 - [Added the `no-proc-macro` value to `cargo-tree --edges` to hide procedural
818 macro dependencies.][cargo/9488]
819 - [A new environment variable named `CARGO_TARGET_TMPDIR` is available.][cargo/9375]
820 This variable points to a directory that integration tests and benches
821 can use as a "scratchpad" for testing filesystem operations.
825 - [Mixing Option and Result via `?` is no longer permitted in closures for inferred types.][86831]
826 - [Previously unsound code is no longer permitted where different constructors in branches
827 could require different lifetimes.][85574]
828 - As previously mentioned the [`std::arch` instrinsics now uses stricter const checking][83278]
829 than before and may reject some previously accepted code.
830 - [`i128` multiplication on Cortex M0+ platforms currently unconditionally causes overflow
831 when compiled with `codegen-units = 1`.][86063]
833 [85574]: https://github.com/rust-lang/rust/issues/85574
834 [86831]: https://github.com/rust-lang/rust/issues/86831
835 [86063]: https://github.com/rust-lang/rust/issues/86063
836 [79608]: https://github.com/rust-lang/rust/pull/79608
837 [84988]: https://github.com/rust-lang/rust/pull/84988
838 [84701]: https://github.com/rust-lang/rust/pull/84701
839 [84072]: https://github.com/rust-lang/rust/pull/84072
840 [85745]: https://github.com/rust-lang/rust/pull/85745
841 [84744]: https://github.com/rust-lang/rust/pull/84744
842 [85078]: https://github.com/rust-lang/rust/pull/85078
843 [84717]: https://github.com/rust-lang/rust/pull/84717
844 [83800]: https://github.com/rust-lang/rust/pull/83800
845 [83366]: https://github.com/rust-lang/rust/pull/83366
846 [83278]: https://github.com/rust-lang/rust/pull/83278
847 [85292]: https://github.com/rust-lang/rust/pull/85292
848 [82834]: https://github.com/rust-lang/rust/pull/82834
849 [cargo/9520]: https://github.com/rust-lang/cargo/pull/9520
850 [cargo/9499]: https://github.com/rust-lang/cargo/pull/9499
851 [cargo/9488]: https://github.com/rust-lang/cargo/pull/9488
852 [cargo/9375]: https://github.com/rust-lang/cargo/pull/9375
853 [`BTreeMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_keys
854 [`BTreeMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.into_values
855 [`HashMap::into_keys`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_keys
856 [`HashMap::into_values`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.into_values
857 [`arch::wasm32`]: https://doc.rust-lang.org/core/arch/wasm32/index.html
858 [`VecDeque::binary_search`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search
859 [`VecDeque::binary_search_by`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by
861 [`VecDeque::binary_search_by_key`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.binary_search_by_key
863 [`VecDeque::partition_point`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.partition_point
865 Version 1.53.0 (2021-06-17)
866 ============================
869 -----------------------
870 - [You can now use unicode for identifiers.][83799] This allows multilingual
871 identifiers but still doesn't allow glyphs that are not considered characters
872 such as `◆` or `🦀`. More specifically you can now use any identifier that
873 matches the UAX #31 "Unicode Identifier and Pattern Syntax" standard. This
874 is the same standard as languages like Python, however Rust uses NFC
875 normalization which may be different from other languages.
876 - [You can now specify "or patterns" inside pattern matches.][79278]
877 Previously you could only use `|` (OR) on complete patterns. E.g.
881 matches!(x, Some(1) | Some(2));
883 matches!(x, Some(1 | 2));
885 - [Added the `:pat_param` `macro_rules!` matcher.][83386] This matcher
886 has the same semantics as the `:pat` matcher. This is to allow `:pat`
887 to change semantics to being a pattern fragment in a future edition.
890 -----------------------
891 - [Updated the minimum external LLVM version to LLVM 10.][83387]
892 - [Added Tier 3\* support for the `wasm64-unknown-unknown` target.][80525]
893 - [Improved debuginfo for closures and async functions on Windows MSVC.][83941]
895 \* Refer to Rust's [platform support page][platform-support-doc] for more
896 information on Rust's tiered platform support.
899 -----------------------
900 - [Abort messages will now forward to `android_set_abort_message` on
901 Android platforms when available.][81469]
902 - [`slice::IterMut<'_, T>` now implements `AsRef<[T]>`][82771]
903 - [Arrays of any length now implement `IntoIterator`.][84147]
904 Currently calling `.into_iter()` as a method on an array will
905 return `impl Iterator<Item=&T>`, but this may change in a
906 future edition to change `Item` to `T`. Calling `IntoIterator::into_iter`
907 directly on arrays will provide `impl Iterator<Item=T>` as expected.
908 - [`leading_zeros`, and `trailing_zeros` are now available on all
909 `NonZero` integer types.][84082]
910 - [`{f32, f64}::from_str` now parse and print special values
911 (`NaN`, `-0`) according to IEEE 754.][78618]
912 - [You can now index into slices using `(Bound<usize>, Bound<usize>)`.][77704]
913 - [Add the `BITS` associated constant to all numeric types.][82565]
917 - [`AtomicBool::fetch_update`]
918 - [`AtomicPtr::fetch_update`]
919 - [`BTreeMap::retain`]
920 - [`BTreeSet::retain`]
921 - [`BufReader::seek_relative`]
922 - [`DebugStruct::non_exhaustive`]
925 - [`Duration::is_zero`]
926 - [`Duration::saturating_add`]
927 - [`Duration::saturating_mul`]
928 - [`Duration::saturating_sub`]
929 - [`ErrorKind::Unsupported`]
931 - [`Ordering::is_eq`]
932 - [`Ordering::is_ge`]
933 - [`Ordering::is_gt`]
934 - [`Ordering::is_le`]
935 - [`Ordering::is_lt`]
936 - [`Ordering::is_ne`]
937 - [`OsStr::is_ascii`]
938 - [`OsStr::make_ascii_lowercase`]
939 - [`OsStr::make_ascii_uppercase`]
940 - [`OsStr::to_ascii_lowercase`]
941 - [`OsStr::to_ascii_uppercase`]
942 - [`Peekable::peek_mut`]
943 - [`Rc::decrement_strong_count`]
944 - [`Rc::increment_strong_count`]
945 - [`Vec::extend_from_within`]
946 - [`array::from_mut`]
947 - [`array::from_ref`]
948 - [`cmp::max_by_key`]
950 - [`cmp::min_by_key`]
952 - [`f32::is_subnormal`]
953 - [`f64::is_subnormal`]
956 -----------------------
957 - [Cargo now supports git repositories where the default `HEAD` branch is not
958 "master".][cargo/9392] This also includes a switch to the version 3 `Cargo.lock` format
959 which can handle default branches correctly.
960 - [macOS targets now default to `unpacked` split-debuginfo.][cargo/9298]
961 - [The `authors` field is no longer included in `Cargo.toml` for new
962 projects.][cargo/9282]
965 -----------------------
966 - [Added the `rustdoc::bare_urls` lint that warns when you have URLs
967 without hyperlinks.][81764]
971 - [Implement token-based handling of attributes during expansion][82608]
972 - [`Ipv4::from_str` will now reject octal format IP addresses in addition
973 to rejecting hexadecimal IP addresses.][83652] The octal format can lead
974 to confusion and potential security vulnerabilities and [is no
975 longer recommended][ietf6943].
976 - [The added `BITS` constant may conflict with external definitions.][85667]
977 In particular, this was known to be a problem in the `lexical-core` crate,
978 but they have published fixes for semantic versions 0.4 through 0.7. To
979 update this dependency alone, use `cargo update -p lexical-core`.
980 - Incremental compilation remains off by default, unless one uses the `RUSTC_FORCE_INCREMENTAL=1` environment variable added in 1.52.1.
984 These changes provide no direct user facing benefits, but represent significant
985 improvements to the internals and overall performance of rustc and
988 - [Rework the `std::sys::windows::alloc` implementation.][83065]
989 - [rustdoc: Don't enter an infer_ctxt in get_blanket_impls for impls that aren't blanket impls.][82864]
990 - [rustdoc: Only look at blanket impls in `get_blanket_impls`][83681]
991 - [Rework rustdoc const type][82873]
993 [85667]: https://github.com/rust-lang/rust/pull/85667
994 [83386]: https://github.com/rust-lang/rust/pull/83386
995 [82771]: https://github.com/rust-lang/rust/pull/82771
996 [84147]: https://github.com/rust-lang/rust/pull/84147
997 [84082]: https://github.com/rust-lang/rust/pull/84082
998 [83799]: https://github.com/rust-lang/rust/pull/83799
999 [83681]: https://github.com/rust-lang/rust/pull/83681
1000 [83652]: https://github.com/rust-lang/rust/pull/83652
1001 [83387]: https://github.com/rust-lang/rust/pull/83387
1002 [82873]: https://github.com/rust-lang/rust/pull/82873
1003 [82864]: https://github.com/rust-lang/rust/pull/82864
1004 [82608]: https://github.com/rust-lang/rust/pull/82608
1005 [82565]: https://github.com/rust-lang/rust/pull/82565
1006 [80525]: https://github.com/rust-lang/rust/pull/80525
1007 [79278]: https://github.com/rust-lang/rust/pull/79278
1008 [78618]: https://github.com/rust-lang/rust/pull/78618
1009 [77704]: https://github.com/rust-lang/rust/pull/77704
1010 [83941]: https://github.com/rust-lang/rust/pull/83941
1011 [83065]: https://github.com/rust-lang/rust/pull/83065
1012 [81764]: https://github.com/rust-lang/rust/pull/81764
1013 [81469]: https://github.com/rust-lang/rust/pull/81469
1014 [cargo/9298]: https://github.com/rust-lang/cargo/pull/9298
1015 [cargo/9282]: https://github.com/rust-lang/cargo/pull/9282
1016 [cargo/9392]: https://github.com/rust-lang/cargo/pull/9392
1017 [`AtomicBool::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicBool.html#method.fetch_update
1018 [`AtomicPtr::fetch_update`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html#method.fetch_update
1019 [`BTreeMap::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.retain
1020 [`BTreeSet::retain`]: https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.retain
1021 [`BufReader::seek_relative`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.seek_relative
1022 [`DebugStruct::non_exhaustive`]: https://doc.rust-lang.org/std/fmt/struct.DebugStruct.html#method.finish_non_exhaustive
1023 [`Duration::MAX`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.MAX
1024 [`Duration::ZERO`]: https://doc.rust-lang.org/std/time/struct.Duration.html#associatedconstant.ZERO
1025 [`Duration::is_zero`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.is_zero
1026 [`Duration::saturating_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_add
1027 [`Duration::saturating_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_mul
1028 [`Duration::saturating_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.saturating_sub
1029 [`ErrorKind::Unsupported`]: https://doc.rust-lang.org/std/io/enum.ErrorKind.html#variant.Unsupported
1030 [`Option::insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.insert
1031 [`Ordering::is_eq`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_eq
1032 [`Ordering::is_ge`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ge
1033 [`Ordering::is_gt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_gt
1034 [`Ordering::is_le`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_le
1035 [`Ordering::is_lt`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_lt
1036 [`Ordering::is_ne`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.is_ne
1037 [`OsStr::is_ascii`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.is_ascii
1038 [`OsStr::make_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_lowercase
1039 [`OsStr::make_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.make_ascii_uppercase
1040 [`OsStr::to_ascii_lowercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_lowercase
1041 [`OsStr::to_ascii_uppercase`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.to_ascii_uppercase
1042 [`Peekable::peek_mut`]: https://doc.rust-lang.org/std/iter/struct.Peekable.html#method.peek_mut
1043 [`Rc::decrement_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1044 [`Rc::increment_strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.increment_strong_count
1045 [`Vec::extend_from_within`]: https://doc.rust-lang.org/beta/std/vec/struct.Vec.html#method.extend_from_within
1046 [`array::from_mut`]: https://doc.rust-lang.org/beta/std/array/fn.from_mut.html
1047 [`array::from_ref`]: https://doc.rust-lang.org/beta/std/array/fn.from_ref.html
1048 [`cmp::max_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by_key.html
1049 [`cmp::max_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.max_by.html
1050 [`cmp::min_by_key`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by_key.html
1051 [`cmp::min_by`]: https://doc.rust-lang.org/beta/std/cmp/fn.min_by.html
1052 [`f32::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1053 [`f64::is_subnormal`]: https://doc.rust-lang.org/std/primitive.f64.html#method.is_subnormal
1054 [ietf6943]: https://datatracker.ietf.org/doc/html/rfc6943#section-3.1.1
1057 Version 1.52.1 (2021-05-10)
1058 ============================
1060 This release disables incremental compilation, unless the user has explicitly
1061 opted in via the newly added RUSTC_FORCE_INCREMENTAL=1 environment variable.
1063 This is due to the widespread, and frequently occurring, breakage encountered by
1064 Rust users due to newly enabled incremental verification in 1.52.0. Notably,
1065 Rust users **should** upgrade to 1.52.0 or 1.52.1: the bugs that are detected by
1066 newly added incremental verification are still present in past stable versions,
1067 and are not yet fixed on any channel. These bugs can lead to miscompilation of
1070 These problems only affect incremental builds, so release builds with Cargo
1071 should not be affected unless the user has explicitly opted into incremental.
1072 Debug and check builds are affected.
1074 See [84970] for more details.
1076 [84970]: https://github.com/rust-lang/rust/issues/84970
1078 Version 1.52.0 (2021-05-06)
1079 ============================
1083 - [Added the `unsafe_op_in_unsafe_fn` lint, which checks whether the unsafe code
1084 in an `unsafe fn` is wrapped in a `unsafe` block.][79208] This lint
1085 is allowed by default, and may become a warning or hard error in a
1087 - [You can now cast mutable references to arrays to a pointer of the same type as
1088 the element.][81479]
1092 - [Upgraded the default LLVM to LLVM 12.][81451]
1094 Added tier 3\* support for the following targets.
1096 - [`s390x-unknown-linux-musl`][82166]
1097 - [`riscv32gc-unknown-linux-musl` & `riscv64gc-unknown-linux-musl`][82202]
1098 - [`powerpc-unknown-openbsd`][82733]
1100 \* Refer to Rust's [platform support page][platform-support-doc] for more
1101 information on Rust's tiered platform support.
1105 - [`OsString` now implements `Extend` and `FromIterator`.][82121]
1106 - [`cmp::Reverse` now has `#[repr(transparent)]` representation.][81879]
1107 - [`Arc<impl Error>` now implements `error::Error`.][80553]
1108 - [All integer division and remainder operations are now `const`.][80962]
1112 - [`Arguments::as_str`]
1114 - [`char::REPLACEMENT_CHARACTER`]
1115 - [`char::UNICODE_VERSION`]
1116 - [`char::decode_utf16`]
1117 - [`char::from_digit`]
1118 - [`char::from_u32_unchecked`]
1119 - [`char::from_u32`]
1120 - [`slice::partition_point`]
1121 - [`str::rsplit_once`]
1122 - [`str::split_once`]
1124 The following previously stable APIs are now `const`.
1126 - [`char::len_utf8`]
1127 - [`char::len_utf16`]
1128 - [`char::to_ascii_uppercase`]
1129 - [`char::to_ascii_lowercase`]
1130 - [`char::eq_ignore_ascii_case`]
1131 - [`u8::to_ascii_uppercase`]
1132 - [`u8::to_ascii_lowercase`]
1133 - [`u8::eq_ignore_ascii_case`]
1137 - [Rustdoc lints are now treated as a tool lint, meaning that
1138 lints are now prefixed with `rustdoc::` (e.g. `#[warn(rustdoc::broken_intra_doc_links)]`).][80527]
1139 Using the old style is still allowed, and will become a warning in
1141 - [Rustdoc now supports argument files.][82261]
1142 - [Rustdoc now generates smart punctuation for documentation.][79423]
1143 - [You can now use "task lists" in Rustdoc Markdown.][81766] E.g.
1151 - [You can now pass multiple filters to tests.][81356] E.g.
1152 `cargo test -- foo bar` will run all tests that match `foo` and `bar`.
1153 - [Rustup now distributes PDB symbols for the `std` library on Windows,
1154 allowing you to see `std` symbols when debugging.][82218]
1158 These changes provide no direct user facing benefits, but represent significant
1159 improvements to the internals and overall performance of rustc and
1162 - [Check the result cache before the DepGraph when ensuring queries][81855]
1163 - [Try fast_reject::simplify_type in coherence before doing full check][81744]
1164 - [Only store a LocalDefId in some HIR nodes][81611]
1165 - [Store HIR attributes in a side table][79519]
1169 - [Cargo build scripts are now forbidden from setting `RUSTC_BOOTSTRAP`.][cargo/9181]
1170 - [Removed support for the `x86_64-rumprun-netbsd` target.][82594]
1171 - [Deprecated the `x86_64-sun-solaris` target in favor of `x86_64-pc-solaris`.][82216]
1172 - [Rustdoc now only accepts `,`, ` `, and `\t` as delimiters for specifying
1173 languages in code blocks.][78429]
1174 - [Rustc now catches more cases of `pub_use_of_private_extern_crate`][80763]
1175 - [Changes in how proc macros handle whitespace may lead to panics when used
1176 with older `proc-macro-hack` versions. A `cargo update` should be sufficient to fix this in all cases.][84136]
1177 - [Turn `#[derive]` into a regular macro attribute][79078]
1179 [84136]: https://github.com/rust-lang/rust/issues/84136
1180 [80763]: https://github.com/rust-lang/rust/pull/80763
1181 [82166]: https://github.com/rust-lang/rust/pull/82166
1182 [82121]: https://github.com/rust-lang/rust/pull/82121
1183 [81879]: https://github.com/rust-lang/rust/pull/81879
1184 [82261]: https://github.com/rust-lang/rust/pull/82261
1185 [82218]: https://github.com/rust-lang/rust/pull/82218
1186 [82216]: https://github.com/rust-lang/rust/pull/82216
1187 [82202]: https://github.com/rust-lang/rust/pull/82202
1188 [81855]: https://github.com/rust-lang/rust/pull/81855
1189 [81766]: https://github.com/rust-lang/rust/pull/81766
1190 [81744]: https://github.com/rust-lang/rust/pull/81744
1191 [81611]: https://github.com/rust-lang/rust/pull/81611
1192 [81479]: https://github.com/rust-lang/rust/pull/81479
1193 [81451]: https://github.com/rust-lang/rust/pull/81451
1194 [81356]: https://github.com/rust-lang/rust/pull/81356
1195 [80962]: https://github.com/rust-lang/rust/pull/80962
1196 [80553]: https://github.com/rust-lang/rust/pull/80553
1197 [80527]: https://github.com/rust-lang/rust/pull/80527
1198 [79519]: https://github.com/rust-lang/rust/pull/79519
1199 [79423]: https://github.com/rust-lang/rust/pull/79423
1200 [79208]: https://github.com/rust-lang/rust/pull/79208
1201 [78429]: https://github.com/rust-lang/rust/pull/78429
1202 [82733]: https://github.com/rust-lang/rust/pull/82733
1203 [82594]: https://github.com/rust-lang/rust/pull/82594
1204 [79078]: https://github.com/rust-lang/rust/pull/79078
1205 [cargo/9181]: https://github.com/rust-lang/cargo/pull/9181
1206 [`char::MAX`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.MAX
1207 [`char::REPLACEMENT_CHARACTER`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.REPLACEMENT_CHARACTER
1208 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/std/primitive.char.html#associatedconstant.UNICODE_VERSION
1209 [`char::decode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.decode_utf16
1210 [`char::from_u32`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32
1211 [`char::from_u32_unchecked`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_u32_unchecked
1212 [`char::from_digit`]: https://doc.rust-lang.org/std/primitive.char.html#method.from_digit
1213 [`Peekable::next_if`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if
1214 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/stable/std/iter/struct.Peekable.html#method.next_if_eq
1215 [`Arguments::as_str`]: https://doc.rust-lang.org/stable/std/fmt/struct.Arguments.html#method.as_str
1216 [`str::split_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_once
1217 [`str::rsplit_once`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.rsplit_once
1218 [`slice::partition_point`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.partition_point
1219 [`char::len_utf8`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf8
1220 [`char::len_utf16`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.len_utf16
1221 [`char::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_uppercase
1222 [`char::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.to_ascii_lowercase
1223 [`char::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.char.html#method.eq_ignore_ascii_case
1224 [`u8::to_ascii_uppercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_uppercase
1225 [`u8::to_ascii_lowercase`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ascii_lowercase
1226 [`u8::eq_ignore_ascii_case`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.eq_ignore_ascii_case
1228 Version 1.51.0 (2021-03-25)
1229 ============================
1233 - [You can now parameterize items such as functions, traits, and `struct`s by constant
1234 values in addition to by types and lifetimes.][79135] Also known as "const generics"
1235 E.g. you can now write the following. Note: Only values of primitive integers,
1236 `bool`, or `char` types are currently permitted.
1238 struct GenericArray<T, const LENGTH: usize> {
1242 impl<T, const LENGTH: usize> GenericArray<T, LENGTH> {
1243 const fn last(&self) -> Option<&T> {
1247 Some(&self.inner[LENGTH - 1])
1257 - [Added the `-Csplit-debuginfo` codegen option for macOS platforms.][79570]
1258 This option controls whether debug information is split across multiple files
1259 or packed into a single file. **Note** This option is unstable on other platforms.
1260 - [Added tier 3\* support for `aarch64_be-unknown-linux-gnu`,
1261 `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
1262 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
1263 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
1265 \* Refer to Rust's [platform support page][platform-support-doc] for more
1266 information on Rust's tiered platform support.
1271 - [`Box::downcast` is now also implemented for any `dyn Any + Send + Sync` object.][80945]
1272 - [`str` now implements `AsMut<str>`.][80279]
1273 - [`u64` and `u128` now implement `From<char>`.][79502]
1274 - [`Error` is now implemented for `&T` where `T` implements `Error`.][75180]
1275 - [`Poll::{map_ok, map_err}` are now implemented for `Poll<Option<Result<T, E>>>`.][80968]
1276 - [`unsigned_abs` is now implemented for all signed integer types.][80959]
1277 - [`io::Empty` now implements `io::Seek`.][78044]
1278 - [`rc::Weak<T>` and `sync::Weak<T>`'s methods such as `as_ptr` are now implemented for
1279 `T: ?Sized` types.][80764]
1280 - [`Div` and `Rem` by their `NonZero` variant is now implemented for all unsigned integers.][79134]
1286 - [`Arc::decrement_strong_count`]
1287 - [`Arc::increment_strong_count`]
1288 - [`Once::call_once_force`]
1289 - [`Peekable::next_if_eq`]
1290 - [`Peekable::next_if`]
1291 - [`Seek::stream_position`]
1292 - [`array::IntoIter`]
1293 - [`panic::panic_any`]
1295 - [`ptr::addr_of_mut!`]
1296 - [`slice::fill_with`]
1297 - [`slice::split_inclusive_mut`]
1298 - [`slice::split_inclusive`]
1299 - [`slice::strip_prefix`]
1300 - [`slice::strip_suffix`]
1301 - [`str::split_inclusive`]
1302 - [`sync::OnceState`]
1304 - [`VecDeque::range`]
1305 - [`VecDeque::range_mut`]
1309 - [Added the `split-debuginfo` profile option to control the -Csplit-debuginfo
1310 codegen option.][cargo/9112]
1311 - [Added the `resolver` field to `Cargo.toml` to enable the new feature resolver
1312 and CLI option behavior.][cargo/8997] Version 2 of the feature resolver will try
1313 to avoid unifying features of dependencies where that unification could be unwanted.
1314 Such as using the same dependency with a `std` feature in a build scripts and
1315 proc-macros, while using the `no-std` feature in the final binary. See the
1316 [Cargo book documentation][feature-resolver@2.0] for more information on the feature.
1321 - [Rustdoc will now include documentation for methods available from _nested_ `Deref` traits.][80653]
1322 - [You can now provide a `--default-theme` flag which sets the default theme to use for
1323 documentation.][79642]
1325 Various improvements to intra-doc links:
1327 - [You can link to non-path primitives such as `slice`.][80181]
1328 - [You can link to associated items.][74489]
1329 - [You can now include generic parameters when linking to items, like `Vec<T>`.][76934]
1333 - [You can now pass `--include-ignored` to tests (e.g. with
1334 `cargo test -- --include-ignored`) to include testing tests marked `#[ignore]`.][80053]
1339 - [WASI platforms no longer use the `wasm-bindgen` ABI, and instead use the wasm32 ABI.][79998]
1340 - [`rustc` no longer promotes division, modulo and indexing operations to `const` that
1342 - [The minimum version of glibc for the following platforms has been bumped to version 2.31
1343 for the distributed artifacts.][81521]
1344 - `armv5te-unknown-linux-gnueabi`
1345 - `sparc64-unknown-linux-gnu`
1346 - `thumbv7neon-unknown-linux-gnueabihf`
1347 - `armv7-unknown-linux-gnueabi`
1348 - `x86_64-unknown-linux-gnux32`
1349 - [`atomic::spin_loop_hint` has been deprecated.][80966] It's recommended to use `hint::spin_loop` instead.
1354 - [Consistently avoid constructing optimized MIR when not doing codegen][80718]
1356 [79135]: https://github.com/rust-lang/rust/pull/79135
1357 [74489]: https://github.com/rust-lang/rust/pull/74489
1358 [76934]: https://github.com/rust-lang/rust/pull/76934
1359 [79570]: https://github.com/rust-lang/rust/pull/79570
1360 [80181]: https://github.com/rust-lang/rust/pull/80181
1361 [79642]: https://github.com/rust-lang/rust/pull/79642
1362 [80945]: https://github.com/rust-lang/rust/pull/80945
1363 [80279]: https://github.com/rust-lang/rust/pull/80279
1364 [80053]: https://github.com/rust-lang/rust/pull/80053
1365 [79502]: https://github.com/rust-lang/rust/pull/79502
1366 [75180]: https://github.com/rust-lang/rust/pull/75180
1367 [81521]: https://github.com/rust-lang/rust/pull/81521
1368 [80968]: https://github.com/rust-lang/rust/pull/80968
1369 [80959]: https://github.com/rust-lang/rust/pull/80959
1370 [80718]: https://github.com/rust-lang/rust/pull/80718
1371 [80653]: https://github.com/rust-lang/rust/pull/80653
1372 [80579]: https://github.com/rust-lang/rust/pull/80579
1373 [79998]: https://github.com/rust-lang/rust/pull/79998
1374 [78044]: https://github.com/rust-lang/rust/pull/78044
1375 [81455]: https://github.com/rust-lang/rust/pull/81455
1376 [80764]: https://github.com/rust-lang/rust/pull/80764
1377 [80749]: https://github.com/rust-lang/rust/pull/80749
1378 [80662]: https://github.com/rust-lang/rust/pull/80662
1379 [79134]: https://github.com/rust-lang/rust/pull/79134
1380 [80966]: https://github.com/rust-lang/rust/pull/80966
1381 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
1382 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
1383 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2
1384 [`Once::call_once_force`]: https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.call_once_force
1385 [`sync::OnceState`]: https://doc.rust-lang.org/stable/std/sync/struct.OnceState.html
1386 [`panic::panic_any`]: https://doc.rust-lang.org/stable/std/panic/fn.panic_any.html
1387 [`slice::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1388 [`slice::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.strip_prefix
1389 [`Arc::increment_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.increment_strong_count
1390 [`Arc::decrement_strong_count`]: https://doc.rust-lang.org/nightly/std/sync/struct.Arc.html#method.decrement_strong_count
1391 [`slice::fill_with`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill_with
1392 [`ptr::addr_of!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of.html
1393 [`ptr::addr_of_mut!`]: https://doc.rust-lang.org/nightly/std/ptr/macro.addr_of_mut.html
1394 [`array::IntoIter`]: https://doc.rust-lang.org/nightly/std/array/struct.IntoIter.html
1395 [`slice::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive
1396 [`slice::split_inclusive_mut`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_inclusive_mut
1397 [`str::split_inclusive`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_inclusive
1398 [`task::Wake`]: https://doc.rust-lang.org/nightly/std/task/trait.Wake.html
1399 [`Seek::stream_position`]: https://doc.rust-lang.org/nightly/std/io/trait.Seek.html#method.stream_position
1400 [`Peekable::next_if`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if
1401 [`Peekable::next_if_eq`]: https://doc.rust-lang.org/nightly/std/iter/struct.Peekable.html#method.next_if_eq
1402 [`VecDeque::range`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range
1403 [`VecDeque::range_mut`]: https://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.range_mut
1405 Version 1.50.0 (2021-02-11)
1406 ============================
1409 -----------------------
1410 - [You can now use `const` values for `x` in `[x; N]` array expressions.][79270]
1411 This has been technically possible since 1.38.0, as it was unintentionally stabilized.
1412 - [Assignments to `ManuallyDrop<T>` union fields are now considered safe.][78068]
1415 -----------------------
1416 - [Added tier 3\* support for the `armv5te-unknown-linux-uclibceabi` target.][78142]
1417 - [Added tier 3 support for the `aarch64-apple-ios-macabi` target.][77484]
1418 - [The `x86_64-unknown-freebsd` is now built with the full toolset.][79484]
1419 - [Dropped support for all cloudabi targets.][78439]
1421 \* Refer to Rust's [platform support page][platform-support-doc] for more
1422 information on Rust's tiered platform support.
1425 -----------------------
1427 - [`proc_macro::Punct` now implements `PartialEq<char>`.][78636]
1428 - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
1429 - [On Unix platforms, the `std::fs::File` type now has a "niche" of `-1`.][74699]
1430 This value cannot be a valid file descriptor, and now means `Option<File>` takes
1431 up the same amount of space as `File`.
1437 - [`btree_map::Entry::or_insert_with_key`]
1440 - [`hash_map::Entry::or_insert_with_key`]
1444 - [`UnsafeCell::get_mut`]
1446 The following previously stable methods are now `const`.
1448 - [`IpAddr::is_ipv4`]
1449 - [`IpAddr::is_ipv6`]
1450 - [`IpAddr::is_unspecified`]
1451 - [`IpAddr::is_loopback`]
1452 - [`IpAddr::is_multicast`]
1453 - [`Ipv4Addr::octets`]
1454 - [`Ipv4Addr::is_loopback`]
1455 - [`Ipv4Addr::is_private`]
1456 - [`Ipv4Addr::is_link_local`]
1457 - [`Ipv4Addr::is_multicast`]
1458 - [`Ipv4Addr::is_broadcast`]
1459 - [`Ipv4Addr::is_documentation`]
1460 - [`Ipv4Addr::to_ipv6_compatible`]
1461 - [`Ipv4Addr::to_ipv6_mapped`]
1462 - [`Ipv6Addr::segments`]
1463 - [`Ipv6Addr::is_unspecified`]
1464 - [`Ipv6Addr::is_loopback`]
1465 - [`Ipv6Addr::is_multicast`]
1466 - [`Ipv6Addr::to_ipv4`]
1469 - [`Layout::from_size_align`]
1470 - `pow` for all integer types.
1471 - `checked_pow` for all integer types.
1472 - `saturating_pow` for all integer types.
1473 - `wrapping_pow` for all integer types.
1474 - `next_power_of_two` for all unsigned integer types.
1475 - `checked_next_power_of_two` for all unsigned integer types.
1478 -----------------------
1480 - [Added the `[build.rustc-workspace-wrapper]` option.][cargo/8976]
1481 This option sets a wrapper to execute instead of `rustc`, for workspace members only.
1482 - [`cargo:rerun-if-changed` will now, if provided a directory, scan the entire
1483 contents of that directory for changes.][cargo/8973]
1484 - [Added the `--workspace` flag to the `cargo update` command.][cargo/8725]
1489 - [The search results tab and the help button are focusable with keyboard in rustdoc.][79896]
1490 - [Running tests will now print the total time taken to execute.][75752]
1495 - [The `compare_and_swap` method on atomics has been deprecated.][79261] It's
1496 recommended to use the `compare_exchange` and `compare_exchange_weak` methods instead.
1497 - [Changes in how `TokenStream`s are checked have fixed some cases where you could write
1498 unhygenic `macro_rules!` macros.][79472]
1499 - [`#![test]` as an inner attribute is now considered unstable like other inner macro
1500 attributes, and reports an error by default through the `soft_unstable` lint.][79003]
1501 - [Overriding a `forbid` lint at the same level that it was set is now a hard error.][78864]
1502 - [You can no longer intercept `panic!` calls by supplying your own macro.][78343] It's
1503 recommended to use the `#[panic_handler]` attribute to provide your own implementation.
1504 - [Semi-colons after item statements (e.g. `struct Foo {};`) now produce a warning.][78296]
1506 [74989]: https://github.com/rust-lang/rust/pull/74989
1507 [79261]: https://github.com/rust-lang/rust/pull/79261
1508 [79896]: https://github.com/rust-lang/rust/pull/79896
1509 [79484]: https://github.com/rust-lang/rust/pull/79484
1510 [79472]: https://github.com/rust-lang/rust/pull/79472
1511 [79270]: https://github.com/rust-lang/rust/pull/79270
1512 [79003]: https://github.com/rust-lang/rust/pull/79003
1513 [78864]: https://github.com/rust-lang/rust/pull/78864
1514 [78636]: https://github.com/rust-lang/rust/pull/78636
1515 [78439]: https://github.com/rust-lang/rust/pull/78439
1516 [78343]: https://github.com/rust-lang/rust/pull/78343
1517 [78296]: https://github.com/rust-lang/rust/pull/78296
1518 [78068]: https://github.com/rust-lang/rust/pull/78068
1519 [75752]: https://github.com/rust-lang/rust/pull/75752
1520 [74699]: https://github.com/rust-lang/rust/pull/74699
1521 [78142]: https://github.com/rust-lang/rust/pull/78142
1522 [77484]: https://github.com/rust-lang/rust/pull/77484
1523 [cargo/8976]: https://github.com/rust-lang/cargo/pull/8976
1524 [cargo/8973]: https://github.com/rust-lang/cargo/pull/8973
1525 [cargo/8725]: https://github.com/rust-lang/cargo/pull/8725
1526 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv4
1527 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_ipv6
1528 [`IpAddr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_unspecified
1529 [`IpAddr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_loopback
1530 [`IpAddr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/enum.IpAddr.html#method.is_multicast
1531 [`Ipv4Addr::octets`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.octets
1532 [`Ipv4Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_loopback
1533 [`Ipv4Addr::is_private`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_private
1534 [`Ipv4Addr::is_link_local`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_link_local
1535 [`Ipv4Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_multicast
1536 [`Ipv4Addr::is_broadcast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_broadcast
1537 [`Ipv4Addr::is_documentation`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.is_documentation
1538 [`Ipv4Addr::to_ipv6_compatible`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_compatible
1539 [`Ipv4Addr::to_ipv6_mapped`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv4Addr.html#method.to_ipv6_mapped
1540 [`Ipv6Addr::segments`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.segments
1541 [`Ipv6Addr::is_unspecified`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_unspecified
1542 [`Ipv6Addr::is_loopback`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_loopback
1543 [`Ipv6Addr::is_multicast`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.is_multicast
1544 [`Ipv6Addr::to_ipv4`]: https://doc.rust-lang.org/stable/std/net/struct.Ipv6Addr.html#method.to_ipv4
1545 [`Layout::align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.align
1546 [`Layout::from_size_align`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.from_size_align
1547 [`Layout::size`]: https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.size
1548 [`Ord::clamp`]: https://doc.rust-lang.org/stable/std/cmp/trait.Ord.html#method.clamp
1549 [`RefCell::take`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.take
1550 [`UnsafeCell::get_mut`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.get_mut
1551 [`bool::then`]: https://doc.rust-lang.org/stable/std/primitive.bool.html#method.then
1552 [`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
1553 [`f32::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.clamp
1554 [`f64::clamp`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.clamp
1555 [`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
1556 [`slice::fill`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.fill
1559 Version 1.49.0 (2020-12-31)
1560 ============================
1563 -----------------------
1565 - [Unions can now implement `Drop`, and you can now have a field in a union
1566 with `ManuallyDrop<T>`.][77547]
1567 - [You can now cast uninhabited enums to integers.][76199]
1568 - [You can now bind by reference and by move in patterns.][76119] This
1569 allows you to selectively borrow individual components of a type. E.g.
1577 let person = Person {
1578 name: String::from("Alice"),
1582 // `name` is moved out of person, but `age` is referenced.
1583 let Person { name, ref age } = person;
1584 println!("{} {}", name, age);
1588 -----------------------
1590 - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
1591 - [Added tier 2 support for `aarch64-apple-darwin`.][75991]
1592 - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
1593 - [Added tier 3 support for `mipsel-unknown-none`.][78676]
1594 - [Raised the minimum supported LLVM version to LLVM 9.][78848]
1595 - [Output from threads spawned in tests is now captured.][78227]
1596 - [Change os and vendor values to "none" and "unknown" for some targets][78951]
1598 \* Refer to Rust's [platform support page][platform-support-doc] for more
1599 information on Rust's tiered platform support.
1602 -----------------------
1604 - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
1605 - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
1610 - [`slice::select_nth_unstable`]
1611 - [`slice::select_nth_unstable_by`]
1612 - [`slice::select_nth_unstable_by_key`]
1614 The following previously stable methods are now `const`.
1616 - [`Poll::is_ready`]
1617 - [`Poll::is_pending`]
1620 -----------------------
1621 - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
1622 - [`cargo-tree` now marks proc-macro crates.][cargo/8765]
1623 - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
1624 variable will be set if the crate being built is one the user selected to build, either
1625 with `-p` or through defaults.
1626 - [You can now use glob patterns when specifying packages & targets.][cargo/8752]
1632 - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
1633 - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
1634 - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
1635 Previously such invalid or unused attributes could be ignored.
1636 - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
1637 read [this post about the changes][rustdoc-ws-post] for more details.
1638 - [Trait bounds are no longer inferred for associated types.][79904]
1642 These changes provide no direct user facing benefits, but represent significant
1643 improvements to the internals and overall performance of rustc and
1646 - [rustc's internal crates are now compiled using the `initial-exec` Thread
1647 Local Storage model.][78201]
1648 - [Calculate visibilities once in resolve.][78077]
1649 - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
1650 - [Added `--color` for configuring terminal color support to bootstrap.][79004]
1653 [75991]: https://github.com/rust-lang/rust/pull/75991
1654 [78951]: https://github.com/rust-lang/rust/pull/78951
1655 [78848]: https://github.com/rust-lang/rust/pull/78848
1656 [78746]: https://github.com/rust-lang/rust/pull/78746
1657 [78376]: https://github.com/rust-lang/rust/pull/78376
1658 [78228]: https://github.com/rust-lang/rust/pull/78228
1659 [78227]: https://github.com/rust-lang/rust/pull/78227
1660 [78201]: https://github.com/rust-lang/rust/pull/78201
1661 [78109]: https://github.com/rust-lang/rust/pull/78109
1662 [78077]: https://github.com/rust-lang/rust/pull/78077
1663 [77997]: https://github.com/rust-lang/rust/pull/77997
1664 [77703]: https://github.com/rust-lang/rust/pull/77703
1665 [77547]: https://github.com/rust-lang/rust/pull/77547
1666 [77015]: https://github.com/rust-lang/rust/pull/77015
1667 [76199]: https://github.com/rust-lang/rust/pull/76199
1668 [76119]: https://github.com/rust-lang/rust/pull/76119
1669 [75914]: https://github.com/rust-lang/rust/pull/75914
1670 [79004]: https://github.com/rust-lang/rust/pull/79004
1671 [78676]: https://github.com/rust-lang/rust/pull/78676
1672 [79904]: https://github.com/rust-lang/rust/issues/79904
1673 [cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
1674 [cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
1675 [cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
1676 [cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
1677 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
1678 [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
1679 [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
1680 [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
1681 [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
1682 [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
1684 Version 1.48.0 (2020-11-19)
1685 ==========================
1690 - [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
1691 is still rejected *semantically*, but can now be parsed by procedural macros.
1695 - [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
1696 `rustc` whether to link its own C runtime and libraries or to rely on a external
1697 linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
1698 - [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
1699 Note: If you're using cargo you must explicitly pass the `--target` flag.
1700 - [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
1702 \* Refer to Rust's [platform support page][platform-support-doc] for more
1703 information on Rust's tiered platform support.
1707 - [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
1708 and `&Stderr`.][76275]
1709 - [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
1710 - [The `matches!` macro now supports having a trailing comma.][74880]
1711 - [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
1712 - [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
1716 - [`slice::as_ptr_range`]
1717 - [`slice::as_mut_ptr_range`]
1718 - [`VecDeque::make_contiguous`]
1719 - [`future::pending`]
1722 The following previously stable methods are now `const fn`'s:
1724 - [`Option::is_some`]
1725 - [`Option::is_none`]
1726 - [`Option::as_ref`]
1728 - [`Result::is_err`]
1729 - [`Result::as_ref`]
1730 - [`Ordering::reverse`]
1731 - [`Ordering::then`]
1738 - [You can now link to items in `rustdoc` using the intra-doc link
1739 syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
1740 a link to `std::future`'s documentation. See ["Linking to items by
1741 name"][intradoc-links] for more information.
1742 - [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
1743 when searching through `rustdoc`'s UI.][75740]
1747 - [Promotion of references to `'static` lifetime inside `const fn` now follows the
1748 same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
1749 promoted to `'static` lifetime any more inside `const fn`s.
1750 - [Associated type bindings on trait objects are now verified to meet the bounds
1751 declared on the trait when checking that they implement the trait.][27675]
1752 - [When trait bounds on associated types or opaque types are ambiguous, the
1753 compiler no longer makes an arbitrary choice on which bound to use.][54121]
1754 - [Fixed recursive nonterminals not being expanded in macros during
1755 pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
1756 correctly handling recursive nonterminal tokens.
1757 - [`&mut` references to non zero-sized types are no longer promoted.][75585]
1758 - [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
1759 in places where they have no effect.][73461]
1760 - [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
1761 `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
1762 - [`mem::uninitialized` will now panic if any inner types inside a struct or enum
1763 disallow zero-initialization.][71274]
1764 - [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
1765 - [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
1766 Note: This behaviour is not guaranteed and is still considered undefined behaviour,
1767 see the [`catch_unwind`] documentation for further information.
1773 These changes provide no direct user facing benefits, but represent significant
1774 improvements to the internals and overall performance of rustc and
1777 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
1778 You can continue building with `make` by setting `ninja=false` in
1780 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
1781 - [Made `ensure_sufficient_stack()` non-generic][76680]
1783 [78143]: https://github.com/rust-lang/rust/issues/78143
1784 [76680]: https://github.com/rust-lang/rust/pull/76680/
1785 [76030]: https://github.com/rust-lang/rust/pull/76030/
1786 [70212]: https://github.com/rust-lang/rust/pull/70212/
1787 [27675]: https://github.com/rust-lang/rust/issues/27675/
1788 [54121]: https://github.com/rust-lang/rust/issues/54121/
1789 [71274]: https://github.com/rust-lang/rust/pull/71274/
1790 [77386]: https://github.com/rust-lang/rust/pull/77386/
1791 [77153]: https://github.com/rust-lang/rust/pull/77153/
1792 [77055]: https://github.com/rust-lang/rust/pull/77055/
1793 [76275]: https://github.com/rust-lang/rust/pull/76275/
1794 [76310]: https://github.com/rust-lang/rust/pull/76310/
1795 [76420]: https://github.com/rust-lang/rust/pull/76420/
1796 [76158]: https://github.com/rust-lang/rust/pull/76158/
1797 [75857]: https://github.com/rust-lang/rust/pull/75857/
1798 [75585]: https://github.com/rust-lang/rust/pull/75585/
1799 [75740]: https://github.com/rust-lang/rust/pull/75740/
1800 [75502]: https://github.com/rust-lang/rust/pull/75502/
1801 [74880]: https://github.com/rust-lang/rust/pull/74880/
1802 [74922]: https://github.com/rust-lang/rust/pull/74922/
1803 [74430]: https://github.com/rust-lang/rust/pull/74430/
1804 [74194]: https://github.com/rust-lang/rust/pull/74194/
1805 [73461]: https://github.com/rust-lang/rust/pull/73461/
1806 [73166]: https://github.com/rust-lang/rust/pull/73166/
1807 [intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
1808 [`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
1809 [`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
1810 [`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
1811 [`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
1812 [`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
1813 [`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
1814 [`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
1815 [`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
1816 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
1817 [`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
1818 [`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
1819 [`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
1820 [`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
1821 [`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
1824 Version 1.47.0 (2020-10-08)
1825 ==========================
1829 - [Closures will now warn when not used.][74869]
1833 - [Stabilized the `-C control-flow-guard` codegen option][73893], which enables
1834 [Control Flow Guard][1.47.0-cfg] for Windows platforms, and is ignored on other
1836 - [Upgraded to LLVM 11.][73526]
1837 - [Added tier 3\* support for the `thumbv4t-none-eabi` target.][74419]
1838 - [Upgrade the FreeBSD toolchain to version 11.4][75204]
1839 - [`RUST_BACKTRACE`'s output is now more compact.][75048]
1841 \* Refer to Rust's [platform support page][platform-support-doc] for more
1842 information on Rust's tiered platform support.
1846 - [`CStr` now implements `Index<RangeFrom<usize>>`.][74021]
1847 - [Traits in `std`/`core` are now implemented for arrays of any length, not just
1848 those of length less than 33.][74060]
1849 - [`ops::RangeFull` and `ops::Range` now implement Default.][73197]
1850 - [`panic::Location` now implements `Copy`, `Clone`, `Eq`, `Hash`, `Ord`,
1851 `PartialEq`, and `PartialOrd`.][73583]
1855 - [`Ident::new_raw`]
1856 - [`Range::is_empty`]
1857 - [`RangeInclusive::is_empty`]
1858 - [`Result::as_deref`]
1859 - [`Result::as_deref_mut`]
1861 - [`pointer::offset_from`]
1865 The following previously stable APIs have now been made const.
1867 - [The `new` method for all `NonZero` integers.][73858]
1868 - [The `checked_add`,`checked_sub`,`checked_mul`,`checked_neg`, `checked_shl`,
1869 `checked_shr`, `saturating_add`, `saturating_sub`, and `saturating_mul`
1870 methods for all integers.][73858]
1871 - [The `checked_abs`, `saturating_abs`, `saturating_neg`, and `signum` for all
1872 signed integers.][73858]
1873 - [The `is_ascii_alphabetic`, `is_ascii_uppercase`, `is_ascii_lowercase`,
1874 `is_ascii_alphanumeric`, `is_ascii_digit`, `is_ascii_hexdigit`,
1875 `is_ascii_punctuation`, `is_ascii_graphic`, `is_ascii_whitespace`, and
1876 `is_ascii_control` methods for `char` and `u8`.][73858]
1880 - [`build-dependencies` are now built with opt-level 0 by default.][cargo/8500]
1881 You can override this by setting the following in your `Cargo.toml`.
1883 [profile.release.build-override]
1886 - [`cargo-help` will now display man pages for commands rather just the
1887 `--help` text.][cargo/8456]
1888 - [`cargo-metadata` now emits a `test` field indicating if a target has
1889 tests enabled.][cargo/8478]
1890 - [`workspace.default-members` now respects `workspace.exclude`.][cargo/8485]
1891 - [`cargo-publish` will now use an alternative registry by default if it's the
1892 only registry specified in `package.publish`.][cargo/8571]
1896 - [Added a help button beside Rustdoc's searchbar that explains rustdoc's
1897 type based search.][75366]
1898 - [Added the Ayu theme to rustdoc.][71237]
1902 - [Bumped the minimum supported Emscripten version to 1.39.20.][75716]
1903 - [Fixed a regression parsing `{} && false` in tail expressions.][74650]
1904 - [Added changes to how proc-macros are expanded in `macro_rules!` that should
1905 help to preserve more span information.][73084] These changes may cause
1906 compiliation errors if your macro was unhygenic or didn't correctly handle
1908 - [Moved support for the CloudABI target to tier 3.][75568]
1909 - [`linux-gnu` targets now require minimum kernel 2.6.32 and glibc 2.11.][74163]
1910 - [Added the `rustc-docs` component.][75560] This allows you to install
1911 and read the documentation for the compiler internal APIs. (Currently only
1912 available for `x86_64-unknown-linux-gnu`.)
1917 - [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.
1919 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard
1920 [75048]: https://github.com/rust-lang/rust/pull/75048/
1921 [74163]: https://github.com/rust-lang/rust/pull/74163/
1922 [71237]: https://github.com/rust-lang/rust/pull/71237/
1923 [74869]: https://github.com/rust-lang/rust/pull/74869/
1924 [73858]: https://github.com/rust-lang/rust/pull/73858/
1925 [75716]: https://github.com/rust-lang/rust/pull/75716/
1926 [75560]: https://github.com/rust-lang/rust/pull/75560/
1927 [75568]: https://github.com/rust-lang/rust/pull/75568/
1928 [75366]: https://github.com/rust-lang/rust/pull/75366/
1929 [75204]: https://github.com/rust-lang/rust/pull/75204/
1930 [74650]: https://github.com/rust-lang/rust/pull/74650/
1931 [74419]: https://github.com/rust-lang/rust/pull/74419/
1932 [73964]: https://github.com/rust-lang/rust/pull/73964/
1933 [74021]: https://github.com/rust-lang/rust/pull/74021/
1934 [74060]: https://github.com/rust-lang/rust/pull/74060/
1935 [73893]: https://github.com/rust-lang/rust/pull/73893/
1936 [73526]: https://github.com/rust-lang/rust/pull/73526/
1937 [73583]: https://github.com/rust-lang/rust/pull/73583/
1938 [73084]: https://github.com/rust-lang/rust/pull/73084/
1939 [73197]: https://github.com/rust-lang/rust/pull/73197/
1940 [cargo/8456]: https://github.com/rust-lang/cargo/pull/8456/
1941 [cargo/8478]: https://github.com/rust-lang/cargo/pull/8478/
1942 [cargo/8485]: https://github.com/rust-lang/cargo/pull/8485/
1943 [cargo/8500]: https://github.com/rust-lang/cargo/pull/8500/
1944 [cargo/8571]: https://github.com/rust-lang/cargo/pull/8571/
1945 [`Ident::new_raw`]: https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw
1946 [`Range::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.Range.html#method.is_empty
1947 [`RangeInclusive::is_empty`]: https://doc.rust-lang.org/nightly/std/ops/struct.RangeInclusive.html#method.is_empty
1948 [`Result::as_deref_mut`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref_mut
1949 [`Result::as_deref`]: https://doc.rust-lang.org/nightly/std/result/enum.Result.html#method.as_deref
1950 [`Vec::leak`]: https://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.leak
1951 [`f32::TAU`]: https://doc.rust-lang.org/nightly/std/f32/consts/constant.TAU.html
1952 [`f64::TAU`]: https://doc.rust-lang.org/nightly/std/f64/consts/constant.TAU.html
1953 [`pointer::offset_from`]: https://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.offset_from
1956 Version 1.46.0 (2020-08-27)
1957 ==========================
1961 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
1962 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
1963 const functions.][73862]
1964 - [The `#[track_caller]` attribute can now be added to functions to use the
1965 function's caller's location information for panic messages.][72445]
1966 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
1967 `x.0.0` over `(x.0).0`.
1968 - [`mem::transmute` can now be used in statics and constants.][72920] **Note**
1969 You currently can't use `mem::transmute` in constant functions.
1973 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
1974 - [Enabled static "Position Independent Executables" by default
1975 for `x86_64-unknown-linux-musl`.][70740]
1979 - [`mem::forget` is now a `const fn`.][73887]
1980 - [`String` now implements `From<char>`.][73466]
1981 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
1982 integer types.][73032]
1983 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
1984 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
1985 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
1986 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
1987 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
1988 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
1993 - [`vec::Drain::as_slice`]
1997 Added a number of new environment variables that are now available when
1998 compiling your crate.
2000 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
2001 the specific binary being compiled and the name of the crate.
2002 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
2003 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
2007 - [The target configuration option `abi_blacklist` has been renamed
2008 to `unsupported_abis`.][74150] The old name will still continue to work.
2009 - [Rustc will now warn if you cast a C-like enum that implements `Drop`.][72331]
2010 This was previously accepted but will become a hard error in a future release.
2011 - [Rustc will fail to compile if you have a struct with
2012 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
2014 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
2015 ensure that spans have the correct information, and may cause breakage if you
2016 were relying on receiving spans with dummy information.
2017 - [The InnoSetup installer for Windows is no longer available.][72569] This was
2018 a legacy installer that was replaced by a MSI installer a few years ago but
2019 was still being built.
2020 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
2021 - [Rustc will no longer accept overlapping trait implementations that only
2022 differ in how the lifetime was bound.][72493]
2023 - [Rustc now correctly relates the lifetime of an existential associated
2024 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
2025 you to pass a shorter lifetime than expected.
2026 - [Rustc now dynamically links to `libz` (also called `zlib`) on Linux.][74420]
2027 The library will need to be installed for `rustc` to work, even though we
2028 expect it to be already available on most systems.
2029 - [Tests annotated with `#[should_panic]` are broken on ARMv7 while running
2031 - [Pretty printing of some tokens in procedural macros changed.][75453] The
2032 exact output returned by rustc's pretty printing is an unstable
2033 implementation detail: we recommend any macro relying on it to switch to a
2034 more robust parsing system.
2036 [75453]: https://github.com/rust-lang/rust/issues/75453/
2037 [74820]: https://github.com/rust-lang/rust/issues/74820/
2038 [74420]: https://github.com/rust-lang/rust/issues/74420/
2039 [74109]: https://github.com/rust-lang/rust/pull/74109/
2040 [74150]: https://github.com/rust-lang/rust/pull/74150/
2041 [73862]: https://github.com/rust-lang/rust/pull/73862/
2042 [73887]: https://github.com/rust-lang/rust/pull/73887/
2043 [73466]: https://github.com/rust-lang/rust/pull/73466/
2044 [73516]: https://github.com/rust-lang/rust/pull/73516/
2045 [73293]: https://github.com/rust-lang/rust/pull/73293/
2046 [73007]: https://github.com/rust-lang/rust/pull/73007/
2047 [73032]: https://github.com/rust-lang/rust/pull/73032/
2048 [72920]: https://github.com/rust-lang/rust/pull/72920/
2049 [72569]: https://github.com/rust-lang/rust/pull/72569/
2050 [72583]: https://github.com/rust-lang/rust/pull/72583/
2051 [72584]: https://github.com/rust-lang/rust/pull/72584/
2052 [72717]: https://github.com/rust-lang/rust/pull/72717/
2053 [72437]: https://github.com/rust-lang/rust/pull/72437/
2054 [72445]: https://github.com/rust-lang/rust/pull/72445/
2055 [72486]: https://github.com/rust-lang/rust/pull/72486/
2056 [72493]: https://github.com/rust-lang/rust/pull/72493/
2057 [72331]: https://github.com/rust-lang/rust/pull/72331/
2058 [71896]: https://github.com/rust-lang/rust/pull/71896/
2059 [71660]: https://github.com/rust-lang/rust/pull/71660/
2060 [71322]: https://github.com/rust-lang/rust/pull/71322/
2061 [70740]: https://github.com/rust-lang/rust/pull/70740/
2062 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
2063 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
2064 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
2065 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
2066 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
2069 Version 1.45.2 (2020-08-03)
2070 ==========================
2072 * [Fix bindings in tuple struct patterns][74954]
2073 * [Fix track_caller integration with trait objects][74784]
2075 [74954]: https://github.com/rust-lang/rust/issues/74954
2076 [74784]: https://github.com/rust-lang/rust/issues/74784
2079 Version 1.45.1 (2020-07-30)
2080 ==========================
2082 * [Fix const propagation with references.][73613]
2083 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2084 * [Avoid spurious implicit region bound.][74509]
2085 * [Install clippy on x.py install][74457]
2087 [73613]: https://github.com/rust-lang/rust/pull/73613
2088 [73078]: https://github.com/rust-lang/rust/issues/73078
2089 [74509]: https://github.com/rust-lang/rust/pull/74509
2090 [74457]: https://github.com/rust-lang/rust/pull/74457
2093 Version 1.45.0 (2020-07-16)
2094 ==========================
2098 - [Out of range float to int conversions using `as` has been defined as a saturating
2099 conversion.][71269] This was previously undefined behaviour, but you can use the
2100 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
2101 may be desirable in rare performance sensitive situations.
2102 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
2103 using `u64`.][70705]
2104 - [Function like procedural macros can now be used in expression, pattern, and statement
2105 positions.][68717] This means you can now use a function-like procedural macro
2106 anywhere you can use a declarative (`macro_rules!`) macro.
2110 - [You can now override individual target features through the `target-feature`
2111 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
2112 equivalent to `-C target-feature=+avx2,+fma`.
2113 - [Added the `force-unwind-tables` flag.][69984] This option allows
2114 rustc to always generate unwind tables regardless of panic strategy.
2115 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
2116 to include LLVM bitcode into generated `rlib`s (this is on by default).
2117 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
2118 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
2119 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
2120 - [Upgraded to LLVM 10.][67759]
2122 \* Refer to Rust's [platform support page][platform-support-doc] for more
2123 information on Rust's tiered platform support.
2128 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
2130 - [`proc_macro::TokenStream` now implements `Default`.][72234]
2131 - [You can now use `char` with
2132 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
2133 a range of codepoints.][72413] E.g.
2134 you can now write the following;
2136 for ch in 'a'..='z' {
2140 // Prints "abcdefghijklmnopqrstuvwxyz"
2142 - [`OsString` now implements `FromStr`.][71662]
2143 - [The `saturating_neg` method has been added to all signed integer primitive
2144 types, and the `saturating_abs` method has been added for all integer
2145 primitive types.][71886]
2146 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
2147 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
2149 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
2150 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
2151 integer types.][69813]
2152 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
2153 integer types.][72324]
2154 - [The `fetch_update` method has been added to all atomic integer types.][71843]
2159 - [`BTreeMap::remove_entry`]
2161 - [`rc::Weak::as_ptr`]
2162 - [`rc::Weak::from_raw`]
2163 - [`rc::Weak::into_raw`]
2164 - [`str::strip_prefix`]
2165 - [`str::strip_suffix`]
2166 - [`sync::Weak::as_ptr`]
2167 - [`sync::Weak::from_raw`]
2168 - [`sync::Weak::into_raw`]
2169 - [`char::UNICODE_VERSION`]
2170 - [`Span::resolved_at`]
2171 - [`Span::located_at`]
2172 - [`Span::mixed_site`]
2173 - [`unix::process::CommandExt::arg0`]
2178 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
2183 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
2184 `~~outdated information~~` becomes "~~outdated information~~".
2185 - [Added an emoji to Rustdoc's deprecated API message.][72014]
2189 - [Trying to self initialize a static value (that is creating a value using
2190 itself) is unsound and now causes a compile error.][71140]
2191 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
2192 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
2193 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
2194 previously undocumented and not intended for public use. Rustdoc still provides
2195 a non-zero exit code on errors.
2196 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
2197 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
2198 flags while cargo is adding `embed-bitcode` itself. The recommended way to
2199 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
2200 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
2204 - [Make clippy a git subtree instead of a git submodule][70655]
2205 - [Unify the undo log of all snapshot types][69464]
2207 [71848]: https://github.com/rust-lang/rust/issues/71848/
2208 [73420]: https://github.com/rust-lang/rust/issues/73420/
2209 [72324]: https://github.com/rust-lang/rust/pull/72324/
2210 [71843]: https://github.com/rust-lang/rust/pull/71843/
2211 [71886]: https://github.com/rust-lang/rust/pull/71886/
2212 [72234]: https://github.com/rust-lang/rust/pull/72234/
2213 [72239]: https://github.com/rust-lang/rust/pull/72239/
2214 [72397]: https://github.com/rust-lang/rust/pull/72397/
2215 [72413]: https://github.com/rust-lang/rust/pull/72413/
2216 [72014]: https://github.com/rust-lang/rust/pull/72014/
2217 [72062]: https://github.com/rust-lang/rust/pull/72062/
2218 [72094]: https://github.com/rust-lang/rust/pull/72094/
2219 [72133]: https://github.com/rust-lang/rust/pull/72133/
2220 [67759]: https://github.com/rust-lang/rust/pull/67759/
2221 [71900]: https://github.com/rust-lang/rust/pull/71900/
2222 [71928]: https://github.com/rust-lang/rust/pull/71928/
2223 [71662]: https://github.com/rust-lang/rust/pull/71662/
2224 [71716]: https://github.com/rust-lang/rust/pull/71716/
2225 [71447]: https://github.com/rust-lang/rust/pull/71447/
2226 [71269]: https://github.com/rust-lang/rust/pull/71269/
2227 [71095]: https://github.com/rust-lang/rust/pull/71095/
2228 [71140]: https://github.com/rust-lang/rust/pull/71140/
2229 [70655]: https://github.com/rust-lang/rust/pull/70655/
2230 [70705]: https://github.com/rust-lang/rust/pull/70705/
2231 [69984]: https://github.com/rust-lang/rust/pull/69984/
2232 [69813]: https://github.com/rust-lang/rust/pull/69813/
2233 [69464]: https://github.com/rust-lang/rust/pull/69464/
2234 [68717]: https://github.com/rust-lang/rust/pull/68717/
2235 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
2236 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
2237 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
2238 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
2239 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
2240 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
2241 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
2242 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
2243 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
2244 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
2245 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
2246 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
2247 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
2248 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
2249 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
2250 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
2251 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
2254 Version 1.44.1 (2020-06-18)
2255 ===========================
2257 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
2258 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
2259 * [Fix crashes when finding backtrace on macOS.][71397]
2260 * [Clippy applies lint levels into different files.][clippy/5356]
2262 [71397]: https://github.com/rust-lang/rust/issues/71397
2263 [73078]: https://github.com/rust-lang/rust/issues/73078
2264 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
2265 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
2268 Version 1.44.0 (2020-06-04)
2269 ==========================
2273 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
2274 - [Added the `unused_braces` lint.][70081]
2276 **Syntax-only changes**
2278 - [Expansion-driven outline module parsing][69838]
2283 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
2288 These are still rejected semantically, so you will likely receive an error but
2289 these changes can be seen and parsed by macros and conditional compilation.
2293 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
2294 Additionally when in incremental mode rustc defaults to 256 codegen units.
2295 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
2296 a panic is thrown.][67502]
2297 - [Added tier 3\* support for the `aarch64-unknown-none` and
2298 `aarch64-unknown-none-softfloat` targets.][68334]
2299 - [Added tier 3 support for `arm64-apple-tvos` and
2300 `x86_64-apple-tvos` targets.][68191]
2305 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
2306 `vec![]` to be able to be used in `const` contexts.
2307 - [`convert::Infallible` now implements `Hash`.][70281]
2308 - [`OsString` now implements `DerefMut` and `IndexMut` returning
2309 a `&mut OsStr`.][70048]
2310 - [Unicode 13 is now supported.][69929]
2311 - [`String` now implements `From<&mut str>`.][69661]
2312 - [`IoSlice` now implements `Copy`.][69403]
2313 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
2314 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
2315 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
2316 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
2317 integer types.][69373]
2321 - [`PathBuf::with_capacity`]
2322 - [`PathBuf::capacity`]
2323 - [`PathBuf::clear`]
2324 - [`PathBuf::reserve`]
2325 - [`PathBuf::reserve_exact`]
2326 - [`PathBuf::shrink_to_fit`]
2327 - [`f32::to_int_unchecked`]
2328 - [`f64::to_int_unchecked`]
2329 - [`Layout::align_to`]
2330 - [`Layout::pad_to_align`]
2332 - [`Layout::extend`]
2336 - [Added the `cargo tree` command which will print a tree graph of
2337 your dependencies.][cargo/8062] E.g.
2339 mdbook v0.3.2 (/Users/src/rust/mdbook)
2341 │ ├── html5ever v0.24.0
2343 │ │ │ └── cfg-if v0.1.9
2345 │ │ └── markup5ever v0.9.0
2346 │ │ ├── log v0.4.8 (*)
2348 │ │ │ └── phf_shared v0.7.24
2349 │ │ │ ├── siphasher v0.2.3
2350 │ │ │ └── unicase v1.4.2
2351 │ │ │ [build-dependencies]
2352 │ │ │ └── version_check v0.1.5
2355 You can also display dependencies on multiple versions of the same crate with
2356 `cargo tree -d` (short for `cargo tree --duplicates`).
2360 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
2361 the version in the sidebar.][69494]
2365 - [Rustc now correctly generates static libraries on Windows GNU targets with
2366 the `.a` extension, rather than the previous `.lib`.][70937]
2367 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
2368 - [The `file_name` property in JSON output of macro errors now points the actual
2369 source file rather than the previous format of `<NAME macros>`.][70969]
2370 **Note:** this may not point to a file that actually exists on the user's system.
2371 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
2372 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
2373 not allow zero initialization such as `NonZeroU8`.][66059] This was
2374 previously a warning.
2375 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
2376 operator has been defined as a saturating operation.][71269] This was previously
2377 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
2378 continue using the current behaviour, which may be desirable in rare performance
2379 sensitive situations.
2383 These changes provide no direct user facing benefits, but represent significant
2384 improvements to the internals and overall performance of rustc and
2387 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
2388 - [Replace big JS dict with JSON parsing.][71250]
2390 [69373]: https://github.com/rust-lang/rust/pull/69373/
2391 [66059]: https://github.com/rust-lang/rust/pull/66059/
2392 [68191]: https://github.com/rust-lang/rust/pull/68191/
2393 [68899]: https://github.com/rust-lang/rust/pull/68899/
2394 [71147]: https://github.com/rust-lang/rust/pull/71147/
2395 [71250]: https://github.com/rust-lang/rust/pull/71250/
2396 [70937]: https://github.com/rust-lang/rust/pull/70937/
2397 [70969]: https://github.com/rust-lang/rust/pull/70969/
2398 [70632]: https://github.com/rust-lang/rust/pull/70632/
2399 [70281]: https://github.com/rust-lang/rust/pull/70281/
2400 [70345]: https://github.com/rust-lang/rust/pull/70345/
2401 [70048]: https://github.com/rust-lang/rust/pull/70048/
2402 [70081]: https://github.com/rust-lang/rust/pull/70081/
2403 [70156]: https://github.com/rust-lang/rust/pull/70156/
2404 [71269]: https://github.com/rust-lang/rust/pull/71269/
2405 [69838]: https://github.com/rust-lang/rust/pull/69838/
2406 [69929]: https://github.com/rust-lang/rust/pull/69929/
2407 [69661]: https://github.com/rust-lang/rust/pull/69661/
2408 [69778]: https://github.com/rust-lang/rust/pull/69778/
2409 [69494]: https://github.com/rust-lang/rust/pull/69494/
2410 [69403]: https://github.com/rust-lang/rust/pull/69403/
2411 [69033]: https://github.com/rust-lang/rust/pull/69033/
2412 [68692]: https://github.com/rust-lang/rust/pull/68692/
2413 [68334]: https://github.com/rust-lang/rust/pull/68334/
2414 [67502]: https://github.com/rust-lang/rust/pull/67502/
2415 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
2416 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
2417 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
2418 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
2419 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
2420 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
2421 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
2422 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
2423 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
2424 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
2425 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
2426 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
2427 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
2430 Version 1.43.1 (2020-05-07)
2431 ===========================
2433 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
2434 * [Fixed the stabilization of AVX-512 features.][71473]
2435 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
2437 [71430]: https://github.com/rust-lang/rust/pull/71430
2438 [71473]: https://github.com/rust-lang/rust/issues/71473
2439 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
2442 Version 1.43.0 (2020-04-23)
2443 ==========================
2447 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
2448 the type inferred correctly.][68129]
2449 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
2451 **Syntax only changes**
2452 - [Allow `type Foo: Ord` syntactically.][69361]
2453 - [Fuse associated and extern items up to defaultness.][69194]
2454 - [Syntactically allow `self` in all `fn` contexts.][68764]
2455 - [Merge `fn` syntax + cleanup item parsing.][68728]
2456 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
2457 For example, you may now write:
2459 macro_rules! mac_trait {
2469 These are still rejected *semantically*, so you will likely receive an error but
2470 these changes can be seen and parsed by macros and
2471 conditional compilation.
2476 - [You can now pass multiple lint flags to rustc to override the previous
2477 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
2478 everything in the `unused` lint group except `unused-variables` which
2479 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
2480 everything in the `unused` lint group **including** `unused-variables` since
2481 the allow flag is specified before the deny flag (and therefore overridden).
2482 - [rustc will now prefer your system MinGW libraries over its bundled libraries
2483 if they are available on `windows-gnu`.][67429]
2484 - [rustc now buffers errors/warnings printed in JSON.][69227]
2488 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
2489 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
2490 respectively.][69538] **Note** These conversions are only available when `N`
2492 - [You can now use associated constants on floats and integers directly, rather
2493 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
2494 `f32::NAN` with no imports.
2495 - [`u8::is_ascii` is now `const`.][68984]
2496 - [`String` now implements `AsMut<str>`.][68742]
2497 - [Added the `primitive` module to `std` and `core`.][67637] This module
2498 reexports Rust's primitive types. This is mainly useful in macros
2499 where you want avoid these types being shadowed.
2500 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
2501 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
2505 - [`Once::is_completed`]
2510 - [`iter::once_with`]
2514 - [You can now set config `[profile]`s in your `.cargo/config`, or through
2515 your environment.][cargo/7823]
2516 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
2517 executable path when running integration tests or benchmarks.][cargo/7697]
2518 `<name>` is the name of your binary as-is e.g. If you wanted the executable
2519 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
2523 - [Certain checks in the `const_err` lint were deemed unrelated to const
2524 evaluation][69185], and have been moved to the `unconditional_panic` and
2525 `arithmetic_overflow` lints.
2530 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
2531 has been a warning since 1.36.0.
2532 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
2533 led to some instances being accepted, and now correctly emits a hard error.
2535 [69340]: https://github.com/rust-lang/rust/pull/69340
2539 These changes provide no direct user facing benefits, but represent significant
2540 improvements to the internals and overall performance of `rustc` and
2543 - [All components are now built with `opt-level=3` instead of `2`.][67878]
2544 - [Improved how rustc generates drop code.][67332]
2545 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
2546 - [traits: preallocate 2 Vecs of known initial size][69022]
2547 - [Avoid exponential behaviour when relating types][68772]
2548 - [Skip `Drop` terminators for enum variants without drop glue][68943]
2549 - [Improve performance of coherence checks][68966]
2550 - [Deduplicate types in the generator witness][68672]
2551 - [Invert control in struct_lint_level.][68725]
2553 [67332]: https://github.com/rust-lang/rust/pull/67332/
2554 [67429]: https://github.com/rust-lang/rust/pull/67429/
2555 [67637]: https://github.com/rust-lang/rust/pull/67637/
2556 [67642]: https://github.com/rust-lang/rust/pull/67642/
2557 [67878]: https://github.com/rust-lang/rust/pull/67878/
2558 [67885]: https://github.com/rust-lang/rust/pull/67885/
2559 [68129]: https://github.com/rust-lang/rust/pull/68129/
2560 [68672]: https://github.com/rust-lang/rust/pull/68672/
2561 [68725]: https://github.com/rust-lang/rust/pull/68725/
2562 [68728]: https://github.com/rust-lang/rust/pull/68728/
2563 [68738]: https://github.com/rust-lang/rust/pull/68738/
2564 [68742]: https://github.com/rust-lang/rust/pull/68742/
2565 [68764]: https://github.com/rust-lang/rust/pull/68764/
2566 [68772]: https://github.com/rust-lang/rust/pull/68772/
2567 [68943]: https://github.com/rust-lang/rust/pull/68943/
2568 [68952]: https://github.com/rust-lang/rust/pull/68952/
2569 [68966]: https://github.com/rust-lang/rust/pull/68966/
2570 [68984]: https://github.com/rust-lang/rust/pull/68984/
2571 [69022]: https://github.com/rust-lang/rust/pull/69022/
2572 [69185]: https://github.com/rust-lang/rust/pull/69185/
2573 [69194]: https://github.com/rust-lang/rust/pull/69194/
2574 [69201]: https://github.com/rust-lang/rust/pull/69201/
2575 [69227]: https://github.com/rust-lang/rust/pull/69227/
2576 [69548]: https://github.com/rust-lang/rust/pull/69548/
2577 [69256]: https://github.com/rust-lang/rust/pull/69256/
2578 [69361]: https://github.com/rust-lang/rust/pull/69361/
2579 [69366]: https://github.com/rust-lang/rust/pull/69366/
2580 [69538]: https://github.com/rust-lang/rust/pull/69538/
2581 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
2582 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
2583 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
2584 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
2585 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
2586 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
2587 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
2588 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
2591 Version 1.42.0 (2020-03-12)
2592 ==========================
2596 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
2598 fn foo(words: &[&str]) {
2600 ["Hello", "World", "!", ..] => println!("Hello World!"),
2601 ["Foo", "Bar", ..] => println!("Baz"),
2602 rest => println!("{:?}", rest),
2606 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
2607 that you can create an enum that has the exact layout and ABI of the type
2609 - [You can now use outer attribute procedural macros on inline modules.][64273]
2610 - [There are some *syntax-only* changes:][67131]
2611 - `default` is syntactically allowed before items in `trait` definitions.
2612 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
2613 leave out their bodies in favor of `;`.
2614 - Bounds on associated types in `impl`s are now syntactically allowed
2615 (e.g. `type Foo: Ord;`).
2616 - `...` (the C-variadic type) may occur syntactically directly as the type of
2617 any function parameter.
2619 These are still rejected *semantically*, so you will likely receive an error
2620 but these changes can be seen and parsed by procedural macros and
2621 conditional compilation.
2625 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
2626 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
2627 - [`Option::{expect,unwrap}` and
2628 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
2629 pointing to the location where they were called, rather than
2630 `core`'s internals. ][67887]
2632 \* Refer to Rust's [platform support page][platform-support-doc] for more
2633 information on Rust's tiered platform support.
2637 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
2638 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
2639 to implement `Sized`.][67935]
2640 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
2641 - [`Layout::new` is now `const`.][66254]
2642 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
2647 - [`CondVar::wait_while`]
2648 - [`CondVar::wait_timeout_while`]
2650 - [`DebugMap::value`]
2651 - [`ManuallyDrop::take`]
2653 - [`ptr::slice_from_raw_parts_mut`]
2654 - [`ptr::slice_from_raw_parts`]
2658 - [You no longer need to include `extern crate proc_macro;` to be able to
2659 `use proc_macro;` in the `2018` edition.][cargo/7700]
2663 - [`Error::description` has been deprecated, and its use will now produce a
2664 warning.][66919] It's recommended to use `Display`/`to_string` instead.
2666 [68253]: https://github.com/rust-lang/rust/pull/68253/
2667 [68348]: https://github.com/rust-lang/rust/pull/68348/
2668 [67935]: https://github.com/rust-lang/rust/pull/67935/
2669 [68339]: https://github.com/rust-lang/rust/pull/68339/
2670 [68122]: https://github.com/rust-lang/rust/pull/68122/
2671 [64273]: https://github.com/rust-lang/rust/pull/64273/
2672 [67712]: https://github.com/rust-lang/rust/pull/67712/
2673 [67887]: https://github.com/rust-lang/rust/pull/67887/
2674 [67131]: https://github.com/rust-lang/rust/pull/67131/
2675 [67233]: https://github.com/rust-lang/rust/pull/67233/
2676 [66899]: https://github.com/rust-lang/rust/pull/66899/
2677 [66919]: https://github.com/rust-lang/rust/pull/66919/
2678 [66254]: https://github.com/rust-lang/rust/pull/66254/
2679 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
2680 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
2681 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
2682 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
2683 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
2684 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
2685 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
2686 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
2687 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
2690 Version 1.41.1 (2020-02-27)
2691 ===========================
2693 * [Always check types of static items][69145]
2694 * [Always check lifetime bounds of `Copy` impls][69145]
2695 * [Fix miscompilation in callers of `Layout::repeat`][69225]
2697 [69225]: https://github.com/rust-lang/rust/issues/69225
2698 [69145]: https://github.com/rust-lang/rust/pull/69145
2701 Version 1.41.0 (2020-01-30)
2702 ===========================
2707 - [You can now pass type parameters to foreign items when implementing
2708 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
2709 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
2710 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
2711 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
2712 - [You can now use any valid identifier in a `format_args` macro.][66847]
2713 Previously identifiers starting with an underscore were not allowed.
2714 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
2715 enum variants.][66183] These are still rejected semantically, but
2716 can be seen and parsed by procedural macros and conditional compilation.
2717 - [You can now define a Rust `extern "C"` function with `Box<T>` and use `T*` as the corresponding
2718 type on the C side.][62514] Please see [the documentation][box-memory-layout] for more information,
2719 including the important caveat about preferring to avoid `Box<T>` in Rust signatures for functions defined in C.
2721 [box-memory-layout]: https://doc.rust-lang.org/std/boxed/index.html#memory-layout
2726 - [Rustc will now warn if you have unused loop `'label`s.][66325]
2727 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
2728 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
2729 - [You can now pass an arguments file passing the `@path` syntax
2730 to rustc.][66172] Note that the format differs somewhat from what is
2731 found in other tooling; please see [the documentation][argfile-docs] for
2733 - [You can now provide `--extern` flag without a path, indicating that it is
2734 available from the search path or specified with an `-L` flag.][64882]
2736 \* Refer to Rust's [platform support page][platform-support-doc] for more
2737 information on Rust's tiered platform support.
2739 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
2744 - [The `core::panic` module is now stable.][66771] It was already stable
2746 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
2747 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
2748 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
2753 - [`Result::map_or`]
2754 - [`Result::map_or_else`]
2755 - [`std::rc::Weak::weak_count`]
2756 - [`std::rc::Weak::strong_count`]
2757 - [`std::sync::Weak::weak_count`]
2758 - [`std::sync::Weak::strong_count`]
2763 - [Cargo will now document all the private items for binary crates
2764 by default.][cargo/7593]
2765 - [`cargo-install` will now reinstall the package if it detects that it is out
2766 of date.][cargo/7560]
2767 - [Cargo.lock now uses a more git friendly format that should help to reduce
2768 merge conflicts.][cargo/7579]
2769 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
2770 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
2771 optimisation level to `2` for debug builds. You can also use
2772 `[profile.<profile>.build-override]` to override build scripts and
2778 - [You can now specify `edition` in documentation code blocks to compile the block
2779 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
2780 should be compiled the 2018 edition of Rust.
2781 - [You can now provide custom themes to rustdoc with `--theme`, and check the
2782 current theme with `--check-theme`.][54733]
2783 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
2788 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
2789 Apple targets.][apple-32bit-drop] This means that the source code is still
2790 available to build, but the targets are no longer being tested and release
2791 binaries for those platforms will no longer be distributed by the Rust project.
2792 Please refer to the linked blog post for more information.
2794 [54733]: https://github.com/rust-lang/rust/pull/54733/
2795 [61351]: https://github.com/rust-lang/rust/pull/61351/
2796 [62514]: https://github.com/rust-lang/rust/pull/62514/
2797 [67255]: https://github.com/rust-lang/rust/pull/67255/
2798 [66661]: https://github.com/rust-lang/rust/pull/66661/
2799 [66771]: https://github.com/rust-lang/rust/pull/66771/
2800 [66847]: https://github.com/rust-lang/rust/pull/66847/
2801 [66238]: https://github.com/rust-lang/rust/pull/66238/
2802 [66277]: https://github.com/rust-lang/rust/pull/66277/
2803 [66325]: https://github.com/rust-lang/rust/pull/66325/
2804 [66172]: https://github.com/rust-lang/rust/pull/66172/
2805 [66183]: https://github.com/rust-lang/rust/pull/66183/
2806 [65879]: https://github.com/rust-lang/rust/pull/65879/
2807 [65013]: https://github.com/rust-lang/rust/pull/65013/
2808 [64882]: https://github.com/rust-lang/rust/pull/64882/
2809 [64325]: https://github.com/rust-lang/rust/pull/64325/
2810 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
2811 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
2812 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
2813 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
2814 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
2815 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
2816 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
2817 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
2818 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
2819 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
2820 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
2822 Version 1.40.0 (2019-12-19)
2823 ===========================
2827 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
2828 `const` contexts.][65188] e.g.
2831 pub struct Point(i32, i32);
2833 const ORIGIN: Point = {
2834 let constructor = Point;
2840 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
2841 indicate that there may be variants or fields added in the future.][64639]
2842 For example this requires adding a wild-card branch (`_ => {}`) to any match
2843 statements on a non-exhaustive `enum`. [(RFC 2008)]
2844 - [You can now use function-like procedural macros in `extern` blocks and in
2845 type positions.][63931] e.g. `type Generated = macro!();`
2846 - [Function-like and attribute procedural macros can now emit
2847 `macro_rules!` items, so you can now have your macros generate macros.][64035]
2848 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
2849 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
2850 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
2854 - [Added tier 3 support\* for the
2855 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
2856 - [Added tier 3 support for the
2857 `aarch64-unknown-none-softfloat` target.][64589]
2858 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
2859 `mips64el-unknown-linux-muslabi64` targets.][65843]
2861 \* Refer to Rust's [platform support page][platform-support-doc] for more
2862 information on Rust's tiered platform support.
2866 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
2870 - [`BTreeMap::get_key_value`]
2871 - [`HashMap::get_key_value`]
2872 - [`Option::as_deref_mut`]
2873 - [`Option::as_deref`]
2874 - [`Option::flatten`]
2875 - [`UdpSocket::peer_addr`]
2876 - [`f32::to_be_bytes`]
2877 - [`f32::to_le_bytes`]
2878 - [`f32::to_ne_bytes`]
2879 - [`f64::to_be_bytes`]
2880 - [`f64::to_le_bytes`]
2881 - [`f64::to_ne_bytes`]
2882 - [`f32::from_be_bytes`]
2883 - [`f32::from_le_bytes`]
2884 - [`f32::from_ne_bytes`]
2885 - [`f64::from_be_bytes`]
2886 - [`f64::from_le_bytes`]
2887 - [`f64::from_ne_bytes`]
2894 - [Cargo will now always display warnings, rather than only on
2895 fresh builds.][cargo/7450]
2896 - [Feature flags (except `--all-features`) passed to a virtual workspace will
2897 now produce an error.][cargo/7507] Previously these flags were ignored.
2898 - [You can now publish `dev-dependencies` without including
2899 a `version`.][cargo/7333]
2903 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
2904 when running documentation tests with `rustdoc`.][63803]
2908 - [As previously announced, any previous NLL warnings in the 2015 edition are
2909 now hard errors.][64221]
2910 - [The `include!` macro will now warn if it failed to include the
2911 entire file.][64284] The `include!` macro unintentionally only includes the
2912 first _expression_ in a file, and this can be unintuitive. This will become
2913 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
2914 - [Using `#[inline]` on function prototypes and consts now emits a warning under
2915 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
2916 or `extern` blocks now correctly emits a hard error.
2918 [65294]: https://github.com/rust-lang/rust/pull/65294/
2919 [66103]: https://github.com/rust-lang/rust/pull/66103/
2920 [65843]: https://github.com/rust-lang/rust/pull/65843/
2921 [65188]: https://github.com/rust-lang/rust/pull/65188/
2922 [65092]: https://github.com/rust-lang/rust/pull/65092/
2923 [64589]: https://github.com/rust-lang/rust/pull/64589/
2924 [64639]: https://github.com/rust-lang/rust/pull/64639/
2925 [64221]: https://github.com/rust-lang/rust/pull/64221/
2926 [64284]: https://github.com/rust-lang/rust/pull/64284/
2927 [63931]: https://github.com/rust-lang/rust/pull/63931/
2928 [64035]: https://github.com/rust-lang/rust/pull/64035/
2929 [63674]: https://github.com/rust-lang/rust/pull/63674/
2930 [63803]: https://github.com/rust-lang/rust/pull/63803/
2931 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
2932 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
2933 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
2934 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
2935 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
2936 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
2937 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
2938 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
2939 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
2940 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
2941 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
2942 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
2943 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
2944 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
2945 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
2946 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
2947 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
2948 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
2949 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
2950 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
2951 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
2952 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
2953 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
2954 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
2955 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
2958 Version 1.39.0 (2019-11-07)
2959 ===========================
2963 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
2964 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
2965 - [You can now use certain attributes on function, closure, and function pointer
2966 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
2967 `deny`, `forbid` as well as inert helper attributes used by procedural macro
2968 attributes applied to items. e.g.
2971 #[cfg(windows)] slice: &[u16],
2972 #[cfg(not(windows))] slice: &[u8],
2977 - [You can now take shared references to bind-by-move patterns in the `if` guards
2978 of `match` arms.][63118] e.g.
2981 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
2985 // ---- `nums` is bound by move.
2986 if nums.iter().sum::<u8>() == 10
2987 // ^------ `.iter()` implicitly takes a reference to `nums`.
2990 // ----------- Legal as `nums` was bound by move and so we have ownership.
2992 _ => unreachable!(),
3001 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
3002 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
3003 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
3004 **Note** Cargo currently doesn't use this feature. Refer to
3005 [cargo#7315][cargo/7315] to track this feature's progress.
3006 - [You can now pass `--show-output` argument to test binaries to print the
3007 output of successful tests.][62600]
3010 \* Refer to Rust's [platform support page][platform-support-doc] for more
3011 information on Rust's tiered platform support.
3015 - [`Vec::new` and `String::new` are now `const` functions.][64028]
3016 - [`LinkedList::new` is now a `const` function.][63684]
3017 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
3018 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
3019 now `const`.][63786]
3023 - [`Pin::into_inner`]
3024 - [`Instant::checked_duration_since`]
3025 - [`Instant::saturating_duration_since`]
3029 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
3030 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
3031 `--all` is now deprecated.
3035 - [You can now pass `-Clinker` to rustdoc to control the linker used
3036 for compiling doctests.][63834]
3040 - [Code that was previously accepted by the old borrow checker, but rejected by
3041 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
3042 previously a warning, and will also become a hard error in the Rust 2015
3043 edition in the 1.40.0 release.
3044 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
3045 run tests.][63827] This should improve performance when running a large
3047 - [The `try!` macro will now issue a deprecation warning.][62672] It is
3048 recommended to use the `?` operator instead.
3049 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
3052 [62600]: https://github.com/rust-lang/rust/pull/62600/
3053 [62672]: https://github.com/rust-lang/rust/pull/62672/
3054 [63118]: https://github.com/rust-lang/rust/pull/63118/
3055 [63209]: https://github.com/rust-lang/rust/pull/63209/
3056 [63402]: https://github.com/rust-lang/rust/pull/63402/
3057 [63565]: https://github.com/rust-lang/rust/pull/63565/
3058 [63595]: https://github.com/rust-lang/rust/pull/63595/
3059 [63684]: https://github.com/rust-lang/rust/pull/63684/
3060 [63698]: https://github.com/rust-lang/rust/pull/63698/
3061 [63770]: https://github.com/rust-lang/rust/pull/63770/
3062 [63786]: https://github.com/rust-lang/rust/pull/63786/
3063 [63827]: https://github.com/rust-lang/rust/pull/63827/
3064 [63834]: https://github.com/rust-lang/rust/pull/63834/
3065 [64010]: https://github.com/rust-lang/rust/pull/64010/
3066 [64028]: https://github.com/rust-lang/rust/pull/64028/
3067 [64334]: https://github.com/rust-lang/rust/pull/64334/
3068 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
3069 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
3070 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
3071 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
3072 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
3073 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
3075 Version 1.38.0 (2019-09-26)
3076 ==========================
3080 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
3081 - [The `#[deprecated]` attribute can now be used on macros.][62042]
3085 - [Added pipelined compilation support to `rustc`.][62766] This will
3086 improve compilation times in some cases. For further information please refer
3087 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
3088 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
3089 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
3090 `x86_64-uwp-windows-msvc` targets.][60260]
3091 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
3092 `armv7-unknown-linux-musleabi` targets.][63107]
3093 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
3094 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
3095 - [Upgraded to LLVM 9.][62592]
3097 \* Refer to Rust's [platform support page][platform-support-doc] for more
3098 information on Rust's tiered platform support.
3102 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
3103 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
3104 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
3105 is available at `std::clone::Clone`). This also makes all built-in macros
3106 available in `std`/`core` root. e.g. `std::include_bytes!`.
3107 - [`str::Chars` now implements `Debug`.][63000]
3108 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
3109 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
3110 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
3111 - [Added euclidean remainder and division operations (`div_euclid`,
3112 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
3113 `overflowing`, and `wrapping` versions are available for all
3115 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
3116 `PartialEq`.][61491]
3117 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
3121 - [`<*const T>::cast`]
3122 - [`<*mut T>::cast`]
3123 - [`Duration::as_secs_f32`]
3124 - [`Duration::as_secs_f64`]
3125 - [`Duration::div_f32`]
3126 - [`Duration::div_f64`]
3127 - [`Duration::from_secs_f32`]
3128 - [`Duration::from_secs_f64`]
3129 - [`Duration::mul_f32`]
3130 - [`Duration::mul_f64`]
3131 - [`any::type_name`]
3135 - [Added pipelined compilation support to `cargo`.][cargo/7143]
3136 - [You can now pass the `--features` option multiple times to enable
3137 multiple features.][cargo/7084]
3142 - [Documentation on `pub use` statements is prepended to the documentation of the re-exported item][63048]
3146 - [`rustc` will now warn about some incorrect uses of
3147 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
3151 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
3153 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
3154 issues][62896] with certain crates such as libc.
3156 [60260]: https://github.com/rust-lang/rust/pull/60260/
3157 [61457]: https://github.com/rust-lang/rust/pull/61457/
3158 [61491]: https://github.com/rust-lang/rust/pull/61491/
3159 [61884]: https://github.com/rust-lang/rust/pull/61884/
3160 [61953]: https://github.com/rust-lang/rust/pull/61953/
3161 [62042]: https://github.com/rust-lang/rust/pull/62042/
3162 [62528]: https://github.com/rust-lang/rust/pull/62528/
3163 [62583]: https://github.com/rust-lang/rust/pull/62583/
3164 [62735]: https://github.com/rust-lang/rust/pull/62735/
3165 [62766]: https://github.com/rust-lang/rust/pull/62766/
3166 [62784]: https://github.com/rust-lang/rust/pull/62784/
3167 [62592]: https://github.com/rust-lang/rust/pull/62592/
3168 [62785]: https://github.com/rust-lang/rust/issues/62785/
3169 [62814]: https://github.com/rust-lang/rust/pull/62814/
3170 [62896]: https://github.com/rust-lang/rust/issues/62896/
3171 [63000]: https://github.com/rust-lang/rust/pull/63000/
3172 [63056]: https://github.com/rust-lang/rust/pull/63056/
3173 [63107]: https://github.com/rust-lang/rust/pull/63107/
3174 [63346]: https://github.com/rust-lang/rust/pull/63346/
3175 [63421]: https://github.com/rust-lang/rust/pull/63421/
3176 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
3177 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
3178 [63048]: https://github.com/rust-lang/rust/pull/63048
3179 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3180 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
3181 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
3182 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
3183 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
3184 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
3185 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
3186 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
3187 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
3188 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
3189 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
3190 [platform-support-doc]: https://doc.rust-lang.org/nightly/rustc/platform-support.html
3191 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
3193 Version 1.37.0 (2019-08-15)
3194 ==========================
3198 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
3199 [`Box`][62228], or an [array][62235] and unused.
3200 - [You can now use the `cfg` and `cfg_attr` attributes on
3201 generic parameters.][61547]
3202 - [You can now use enum variants through type alias.][61682] e.g. You can
3203 write the following:
3205 type MyOption = Option<u8>;
3207 fn increment_or_zero(x: MyOption) -> u8 {
3209 MyOption::Some(y) => y + 1,
3210 MyOption::None => 0,
3214 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
3215 `const _: u32 = 5;`.
3216 - [You can now use `#[repr(align(X)]` on enums.][61229]
3217 - [The `?` Kleene macro operator is now available in the
3218 2015 edition.][60932]
3222 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
3223 and `-C profile-use` flags.][61268] For more information on how to use profile
3224 guided optimization, please refer to the [rustc book][rustc-book-pgo].
3225 - [The `rust-lldb` wrapper script should now work again.][61827]
3229 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
3233 - [`BufReader::buffer`]
3234 - [`BufWriter::buffer`]
3235 - [`Cell::from_mut`]
3236 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
3237 - [`DoubleEndedIterator::nth_back`]
3239 - [`Wrapping::reverse_bits`]
3240 - [`i128::reverse_bits`]
3241 - [`i16::reverse_bits`]
3242 - [`i32::reverse_bits`]
3243 - [`i64::reverse_bits`]
3244 - [`i8::reverse_bits`]
3245 - [`isize::reverse_bits`]
3246 - [`slice::copy_within`]
3247 - [`u128::reverse_bits`]
3248 - [`u16::reverse_bits`]
3249 - [`u32::reverse_bits`]
3250 - [`u64::reverse_bits`]
3251 - [`u8::reverse_bits`]
3252 - [`usize::reverse_bits`]
3256 - [`Cargo.lock` files are now included by default when publishing executable crates
3257 with executables.][cargo/7026]
3258 - [You can now specify `default-run="foo"` in `[package]` to specify the
3259 default executable to use for `cargo run`.][cargo/7056]
3266 - [Using `...` for inclusive range patterns will now warn by default.][61342]
3267 Please transition your code to using the `..=` syntax for inclusive
3269 - [Using a trait object without the `dyn` will now warn by default.][61203]
3270 Please transition your code to use `dyn Trait` for trait objects instead.
3272 [62228]: https://github.com/rust-lang/rust/pull/62228/
3273 [62235]: https://github.com/rust-lang/rust/pull/62235/
3274 [61802]: https://github.com/rust-lang/rust/pull/61802/
3275 [61827]: https://github.com/rust-lang/rust/pull/61827/
3276 [61547]: https://github.com/rust-lang/rust/pull/61547/
3277 [61682]: https://github.com/rust-lang/rust/pull/61682/
3278 [61268]: https://github.com/rust-lang/rust/pull/61268/
3279 [61342]: https://github.com/rust-lang/rust/pull/61342/
3280 [61347]: https://github.com/rust-lang/rust/pull/61347/
3281 [61100]: https://github.com/rust-lang/rust/pull/61100/
3282 [61203]: https://github.com/rust-lang/rust/pull/61203/
3283 [61229]: https://github.com/rust-lang/rust/pull/61229/
3284 [60932]: https://github.com/rust-lang/rust/pull/60932/
3285 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
3286 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
3287 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
3288 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
3289 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
3290 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
3291 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
3292 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
3293 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
3294 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
3295 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
3296 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
3297 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
3298 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
3299 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
3300 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
3301 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
3302 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
3303 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
3304 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
3305 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
3306 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
3307 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
3310 Version 1.36.0 (2019-07-04)
3311 ==========================
3315 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
3316 - [The order of traits in trait objects no longer affects the semantics of that
3317 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
3318 `dyn fmt::Debug + Send`, where this was previously not the case.
3322 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
3323 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
3324 - [`mem::needs_drop` is now available as a const fn.][60364]
3325 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
3326 - [`String` now implements `BorrowMut<str>`.][60404]
3327 - [`io::Cursor` now implements `Default`.][60234]
3328 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
3329 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
3330 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
3331 environment has access to heap memory allocation.
3332 - [`String` now implements `From<&String>`.][59825]
3333 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
3334 return a tuple of each argument when there is multiple arguments.
3335 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
3340 - [`VecDeque::rotate_left`]
3341 - [`VecDeque::rotate_right`]
3342 - [`Iterator::copied`]
3344 - [`io::IoSliceMut`]
3345 - [`Read::read_vectored`]
3346 - [`Write::write_vectored`]
3347 - [`str::as_mut_ptr`]
3348 - [`mem::MaybeUninit`]
3349 - [`pointer::align_offset`]
3350 - [`future::Future`]
3352 - [`task::RawWaker`]
3353 - [`task::RawWakerVTable`]
3359 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
3360 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
3362 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
3366 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
3373 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
3374 longer recommended, and will be deprecated in 1.39.0.
3376 [60318]: https://github.com/rust-lang/rust/pull/60318/
3377 [60364]: https://github.com/rust-lang/rust/pull/60364/
3378 [60370]: https://github.com/rust-lang/rust/pull/60370/
3379 [60404]: https://github.com/rust-lang/rust/pull/60404/
3380 [60234]: https://github.com/rust-lang/rust/pull/60234/
3381 [60244]: https://github.com/rust-lang/rust/pull/60244/
3382 [58623]: https://github.com/rust-lang/rust/pull/58623/
3383 [59648]: https://github.com/rust-lang/rust/pull/59648/
3384 [59675]: https://github.com/rust-lang/rust/pull/59675/
3385 [59825]: https://github.com/rust-lang/rust/pull/59825/
3386 [59826]: https://github.com/rust-lang/rust/pull/59826/
3387 [59445]: https://github.com/rust-lang/rust/pull/59445/
3388 [59114]: https://github.com/rust-lang/rust/pull/59114/
3389 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
3390 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
3391 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
3392 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
3393 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
3394 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
3395 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
3396 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
3397 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
3398 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
3399 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
3400 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
3401 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
3402 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
3403 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
3404 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
3405 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
3406 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
3407 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
3408 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
3411 Version 1.35.0 (2019-05-23)
3412 ==========================
3416 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
3417 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
3418 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
3420 unsafe fn call_unsafe(func: unsafe fn()) {
3425 unsafe { call_unsafe(|| {}); }
3432 - [Added the `armv6-unknown-freebsd-gnueabihf` and
3433 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
3434 - [Added the `wasm32-unknown-wasi` target.][59464]
3439 - [`Thread` will now show its ID in `Debug` output.][59460]
3440 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
3441 - [`alloc::System` now implements `Default`.][59451]
3442 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
3444 - [`char::{ToLowercase, ToUppercase}` now
3445 implement `ExactSizeIterator`.][58778]
3446 - [All `NonZero` numeric types now implement `FromStr`.][58717]
3447 - [Removed the `Read` trait bounds
3448 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
3449 - [You can now call the `dbg!` macro without any parameters to print the file
3450 and line where it is called.][57847]
3451 - [In place ASCII case conversions are now up to 4× faster.][59283]
3452 e.g. `str::make_ascii_lowercase`
3453 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
3460 - [`RefCell::replace_with`]
3461 - [`RefCell::map_split`]
3463 - [`Range::contains`]
3464 - [`RangeFrom::contains`]
3465 - [`RangeTo::contains`]
3466 - [`RangeInclusive::contains`]
3467 - [`RangeToInclusive::contains`]
3468 - [`Option::copied`]
3472 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
3473 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
3478 - [The Rust toolchain is now available natively for musl based distros.][58575]
3480 [59460]: https://github.com/rust-lang/rust/pull/59460/
3481 [59464]: https://github.com/rust-lang/rust/pull/59464/
3482 [59500]: https://github.com/rust-lang/rust/pull/59500/
3483 [59512]: https://github.com/rust-lang/rust/pull/59512/
3484 [59580]: https://github.com/rust-lang/rust/pull/59580/
3485 [59283]: https://github.com/rust-lang/rust/pull/59283/
3486 [59451]: https://github.com/rust-lang/rust/pull/59451/
3487 [59076]: https://github.com/rust-lang/rust/pull/59076/
3488 [58778]: https://github.com/rust-lang/rust/pull/58778/
3489 [58717]: https://github.com/rust-lang/rust/pull/58717/
3490 [58369]: https://github.com/rust-lang/rust/pull/58369/
3491 [58423]: https://github.com/rust-lang/rust/pull/58423/
3492 [58080]: https://github.com/rust-lang/rust/pull/58080/
3493 [57847]: https://github.com/rust-lang/rust/pull/57847/
3494 [58575]: https://github.com/rust-lang/rust/pull/58575
3495 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
3496 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
3497 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
3498 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
3499 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
3500 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
3501 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
3502 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
3503 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
3504 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
3505 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
3506 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
3508 Version 1.34.2 (2019-05-14)
3509 ===========================
3511 * [Destabilize the `Error::type_id` function due to a security
3512 vulnerability][60785] ([CVE-2019-12083])
3514 [60785]: https://github.com/rust-lang/rust/pull/60785
3515 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
3517 Version 1.34.1 (2019-04-25)
3518 ===========================
3520 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
3521 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
3522 * [Fix Clippy panic when checking some macros][clippy/3805]
3524 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
3525 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
3526 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
3528 Version 1.34.0 (2019-04-11)
3529 ==========================
3533 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
3534 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
3536 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
3537 `#[attr{}]` procedural macros.][57367]
3538 - [You can now write `extern crate self as foo;`][57407] to import your
3539 crate's root into the extern prelude.
3544 - [You can now target `riscv64imac-unknown-none-elf` and
3545 `riscv64gc-unknown-none-elf`.][58406]
3546 - [You can now enable linker plugin LTO optimisations with
3547 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
3548 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
3550 - [You can now target `powerpc64-unknown-freebsd`.][57809]
3555 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
3556 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
3557 the `Hash` trait to create an iterator.
3558 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
3559 methods.][58421] Most notably you no longer require the `Ord` trait to create
3561 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
3562 for all numeric types.][58044]
3563 - [Indexing a `str` is now generic over all types that
3564 implement `SliceIndex<str>`.][57604]
3565 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
3566 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
3567 produce a warning if their returning type is unused.
3568 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
3569 `overflowing_pow` are now available for all numeric types.][57873] These are
3570 equivalent to methods such as `wrapping_add` for the `pow` operation.
3578 * [`Error::type_id`]
3579 * [`atomic::AtomicI16`]
3580 * [`atomic::AtomicI32`]
3581 * [`atomic::AtomicI64`]
3582 * [`atomic::AtomicI8`]
3583 * [`atomic::AtomicU16`]
3584 * [`atomic::AtomicU32`]
3585 * [`atomic::AtomicU64`]
3586 * [`atomic::AtomicU8`]
3587 * [`convert::Infallible`]
3588 * [`convert::TryFrom`]
3589 * [`convert::TryInto`]
3591 * [`iter::successors`]
3592 * [`num::NonZeroI128`]
3593 * [`num::NonZeroI16`]
3594 * [`num::NonZeroI32`]
3595 * [`num::NonZeroI64`]
3596 * [`num::NonZeroI8`]
3597 * [`num::NonZeroIsize`]
3598 * [`slice::sort_by_cached_key`]
3599 * [`str::escape_debug`]
3600 * [`str::escape_default`]
3601 * [`str::escape_unicode`]
3602 * [`str::split_ascii_whitespace`]
3605 * [`Instant::checked_add`]
3606 * [`Instant::checked_sub`]
3607 * [`SystemTime::checked_add`]
3608 * [`SystemTime::checked_sub`]
3612 - [You can now use alternative registries to crates.io.][cargo/6654]
3616 - [You can now use the `?` operator in your documentation tests without manually
3617 adding `fn main() -> Result<(), _> {}`.][56470]
3621 - [`Command::before_exec` is being replaced by the unsafe method
3622 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
3623 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
3624 can now use `const` functions in `static` variables.
3626 [58370]: https://github.com/rust-lang/rust/pull/58370/
3627 [58406]: https://github.com/rust-lang/rust/pull/58406/
3628 [58421]: https://github.com/rust-lang/rust/pull/58421/
3629 [58166]: https://github.com/rust-lang/rust/pull/58166/
3630 [58044]: https://github.com/rust-lang/rust/pull/58044/
3631 [58057]: https://github.com/rust-lang/rust/pull/58057/
3632 [58059]: https://github.com/rust-lang/rust/pull/58059/
3633 [57809]: https://github.com/rust-lang/rust/pull/57809/
3634 [57873]: https://github.com/rust-lang/rust/pull/57873/
3635 [57604]: https://github.com/rust-lang/rust/pull/57604/
3636 [57367]: https://github.com/rust-lang/rust/pull/57367/
3637 [57407]: https://github.com/rust-lang/rust/pull/57407/
3638 [57425]: https://github.com/rust-lang/rust/pull/57425/
3639 [57106]: https://github.com/rust-lang/rust/pull/57106/
3640 [56470]: https://github.com/rust-lang/rust/pull/56470/
3641 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
3642 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
3643 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
3644 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
3645 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
3646 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
3647 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
3648 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
3649 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
3650 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
3651 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
3652 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
3653 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
3654 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
3655 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
3656 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
3657 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
3658 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
3659 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
3660 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
3661 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
3662 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
3663 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
3664 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
3665 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
3666 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
3667 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
3668 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
3669 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
3670 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
3671 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
3674 Version 1.33.0 (2019-02-28)
3675 ==========================
3679 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
3680 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
3681 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
3682 E.g. You can have match statement on a `u8` that covers `0..=255` and
3683 you would no longer be required to have a `_ => unreachable!()` case.
3684 - [You can now have multiple patterns in `if let` and `while let`
3685 expressions.][57532] You can do this with the same syntax as a `match`
3695 let state = Creature::Crab("Ferris");
3697 if let Creature::Crab(name) | Creature::Person(name) = state {
3698 println!("This creature's name is: {}", name);
3702 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
3703 this feature will by default produce a warning as this behaviour can be
3704 unintuitive. E.g. `if let _ = 5 {}`
3705 - [You can now use `let` bindings, assignments, expression statements,
3706 and irrefutable pattern destructuring in const functions.][57175]
3707 - [You can now call unsafe const functions.][57067] E.g.
3709 const unsafe fn foo() -> i32 { 5 }
3710 const fn bar() -> i32 {
3714 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
3715 E.g. `#[cfg_attr(all(), must_use, optimize)]`
3716 - [You can now specify a specific alignment with the `#[repr(packed)]`
3717 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
3718 with an alignment of 2 bytes and a size of 6 bytes.
3719 - [You can now import an item from a module as an `_`.][56303] This allows you to
3720 import a trait's impls, and not have the name in the namespace. E.g.
3722 use std::io::Read as _;
3724 // Allowed as there is only one `Read` in the module.
3727 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
3731 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
3732 command line argument.][56351]
3733 - [The minimum required LLVM version has been bumped to 6.0.][56642]
3734 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
3735 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
3736 tier 2 support.][57130] Visit the [platform support][platform-support] page for
3737 information on Rust's platform support.
3738 - [Added support for the `thumbv7neon-linux-androideabi` and
3739 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
3740 - [Added support for the `x86_64-unknown-uefi` target.][56769]
3744 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
3745 functions for all numeric types.][57566]
3746 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
3747 are now `const` functions for all numeric types.][57105]
3748 - [The methods `is_positive` and `is_negative` are now `const` functions for
3749 all signed numeric types.][57105]
3750 - [The `get` method for all `NonZero` types is now `const`.][57167]
3751 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
3752 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
3753 numeric types.][57234]
3754 - [`Ipv4Addr::new` is now a `const` function][57234]
3758 - [`unix::FileExt::read_exact_at`]
3759 - [`unix::FileExt::write_all_at`]
3760 - [`Option::transpose`]
3761 - [`Result::transpose`]
3762 - [`convert::identity`]
3765 - [`marker::PhantomPinned`]
3766 - [`Vec::resize_with`]
3767 - [`VecDeque::resize_with`]
3768 - [`Duration::as_millis`]
3769 - [`Duration::as_micros`]
3770 - [`Duration::as_nanos`]
3775 - [You can now publish crates that require a feature flag to compile with
3776 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
3777 - [Cargo should now rebuild a crate if a file was modified during the initial
3782 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
3783 are now deprecated in the standard library, and their usage will now produce a warning.
3784 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
3786 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
3788 - [Libtest no longer creates a new thread for each test when
3789 `--test-threads=1`. It also runs the tests in deterministic order][56243]
3791 [56243]: https://github.com/rust-lang/rust/pull/56243
3792 [56303]: https://github.com/rust-lang/rust/pull/56303/
3793 [56351]: https://github.com/rust-lang/rust/pull/56351/
3794 [56362]: https://github.com/rust-lang/rust/pull/56362
3795 [56642]: https://github.com/rust-lang/rust/pull/56642/
3796 [56769]: https://github.com/rust-lang/rust/pull/56769/
3797 [56805]: https://github.com/rust-lang/rust/pull/56805
3798 [56947]: https://github.com/rust-lang/rust/pull/56947/
3799 [57049]: https://github.com/rust-lang/rust/pull/57049/
3800 [57067]: https://github.com/rust-lang/rust/pull/57067/
3801 [57105]: https://github.com/rust-lang/rust/pull/57105
3802 [57130]: https://github.com/rust-lang/rust/pull/57130/
3803 [57167]: https://github.com/rust-lang/rust/pull/57167/
3804 [57175]: https://github.com/rust-lang/rust/pull/57175/
3805 [57234]: https://github.com/rust-lang/rust/pull/57234/
3806 [57332]: https://github.com/rust-lang/rust/pull/57332/
3807 [57465]: https://github.com/rust-lang/rust/pull/57465/
3808 [57532]: https://github.com/rust-lang/rust/pull/57532/
3809 [57535]: https://github.com/rust-lang/rust/pull/57535/
3810 [57566]: https://github.com/rust-lang/rust/pull/57566/
3811 [57615]: https://github.com/rust-lang/rust/pull/57615/
3812 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
3813 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
3814 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
3815 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
3816 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
3817 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
3818 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
3819 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
3820 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
3821 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
3822 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
3823 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
3824 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
3825 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
3826 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
3827 [platform-support]: https://forge.rust-lang.org/platform-support.html
3829 Version 1.32.0 (2019-01-17)
3830 ==========================
3835 - [You can now use the `?` operator in macro definitions.][56245] The `?`
3836 operator allows you to specify zero or one repetitions similar to the `*` and
3838 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
3839 now always resolve to the item (`enum`, `struct`, etc.) available in the
3840 module if present, before resolving to a external crate or an item the prelude.][56759]
3843 enum Color { Red, Green, Blue }
3849 - [You can now match against `PhantomData<T>` types.][55837]
3850 - [You can now match against literals in macros with the `literal`
3851 specifier.][56072] This will match against a literal of any type.
3852 E.g. `1`, `'A'`, `"Hello World"`
3853 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
3855 struct Point(i32, i32);
3858 pub fn new(x: i32, y: i32) -> Self {
3862 pub fn is_origin(&self) -> bool {
3870 - [Self can also now be used in type definitions.][56366] E.g.
3874 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
3877 Cons(T, Box<Self>) // likewise here
3880 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
3881 a `impl Trait` or `dyn Trait` is returned and unused in the program.
3885 - [The default allocator has changed from jemalloc to the default allocator on
3886 your system.][55238] The compiler itself on Linux & macOS will still use
3887 jemalloc, but programs compiled with it will use the system allocator.
3888 - [Added the `aarch64-pc-windows-msvc` target.][55702]
3892 - [`PathBuf` now implements `FromStr`.][55148]
3893 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
3894 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
3895 easily debug expressions in your rust program. E.g.
3898 let b = dbg!(a * 2) + 1;
3899 // ^-- prints: [src/main.rs:4] a * 2 = 4
3903 The following APIs are now `const` functions and can be used in a
3907 - [`UnsafeCell::get`]
3908 - [`char::is_ascii`]
3910 - [`ManuallyDrop::new`]
3911 - [`ManuallyDrop::into_inner`]
3912 - [`RangeInclusive::start`]
3913 - [`RangeInclusive::end`]
3914 - [`NonNull::as_ptr`]
3917 - [`Duration::as_secs`]
3918 - [`Duration::subsec_millis`]
3919 - [`Duration::subsec_micros`]
3920 - [`Duration::subsec_nanos`]
3922 - [`Ipv4Addr::is_unspecified`]
3924 - [`Ipv6Addr::octets`]
3928 - [`i8::to_be_bytes`]
3929 - [`i8::to_le_bytes`]
3930 - [`i8::to_ne_bytes`]
3931 - [`i8::from_be_bytes`]
3932 - [`i8::from_le_bytes`]
3933 - [`i8::from_ne_bytes`]
3934 - [`i16::to_be_bytes`]
3935 - [`i16::to_le_bytes`]
3936 - [`i16::to_ne_bytes`]
3937 - [`i16::from_be_bytes`]
3938 - [`i16::from_le_bytes`]
3939 - [`i16::from_ne_bytes`]
3940 - [`i32::to_be_bytes`]
3941 - [`i32::to_le_bytes`]
3942 - [`i32::to_ne_bytes`]
3943 - [`i32::from_be_bytes`]
3944 - [`i32::from_le_bytes`]
3945 - [`i32::from_ne_bytes`]
3946 - [`i64::to_be_bytes`]
3947 - [`i64::to_le_bytes`]
3948 - [`i64::to_ne_bytes`]
3949 - [`i64::from_be_bytes`]
3950 - [`i64::from_le_bytes`]
3951 - [`i64::from_ne_bytes`]
3952 - [`i128::to_be_bytes`]
3953 - [`i128::to_le_bytes`]
3954 - [`i128::to_ne_bytes`]
3955 - [`i128::from_be_bytes`]
3956 - [`i128::from_le_bytes`]
3957 - [`i128::from_ne_bytes`]
3958 - [`isize::to_be_bytes`]
3959 - [`isize::to_le_bytes`]
3960 - [`isize::to_ne_bytes`]
3961 - [`isize::from_be_bytes`]
3962 - [`isize::from_le_bytes`]
3963 - [`isize::from_ne_bytes`]
3964 - [`u8::to_be_bytes`]
3965 - [`u8::to_le_bytes`]
3966 - [`u8::to_ne_bytes`]
3967 - [`u8::from_be_bytes`]
3968 - [`u8::from_le_bytes`]
3969 - [`u8::from_ne_bytes`]
3970 - [`u16::to_be_bytes`]
3971 - [`u16::to_le_bytes`]
3972 - [`u16::to_ne_bytes`]
3973 - [`u16::from_be_bytes`]
3974 - [`u16::from_le_bytes`]
3975 - [`u16::from_ne_bytes`]
3976 - [`u32::to_be_bytes`]
3977 - [`u32::to_le_bytes`]
3978 - [`u32::to_ne_bytes`]
3979 - [`u32::from_be_bytes`]
3980 - [`u32::from_le_bytes`]
3981 - [`u32::from_ne_bytes`]
3982 - [`u64::to_be_bytes`]
3983 - [`u64::to_le_bytes`]
3984 - [`u64::to_ne_bytes`]
3985 - [`u64::from_be_bytes`]
3986 - [`u64::from_le_bytes`]
3987 - [`u64::from_ne_bytes`]
3988 - [`u128::to_be_bytes`]
3989 - [`u128::to_le_bytes`]
3990 - [`u128::to_ne_bytes`]
3991 - [`u128::from_be_bytes`]
3992 - [`u128::from_le_bytes`]
3993 - [`u128::from_ne_bytes`]
3994 - [`usize::to_be_bytes`]
3995 - [`usize::to_le_bytes`]
3996 - [`usize::to_ne_bytes`]
3997 - [`usize::from_be_bytes`]
3998 - [`usize::from_le_bytes`]
3999 - [`usize::from_ne_bytes`]
4003 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
4004 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
4008 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
4012 - [The argument types for AVX's
4013 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
4014 been changed from `*const` to `*mut` as the previous implementation
4018 [55148]: https://github.com/rust-lang/rust/pull/55148/
4019 [55238]: https://github.com/rust-lang/rust/pull/55238/
4020 [55280]: https://github.com/rust-lang/rust/pull/55280/
4021 [55610]: https://github.com/rust-lang/rust/pull/55610/
4022 [55663]: https://github.com/rust-lang/rust/pull/55663/
4023 [55702]: https://github.com/rust-lang/rust/pull/55702/
4024 [55837]: https://github.com/rust-lang/rust/pull/55837/
4025 [55843]: https://github.com/rust-lang/rust/pull/55843/
4026 [56072]: https://github.com/rust-lang/rust/pull/56072/
4027 [56245]: https://github.com/rust-lang/rust/pull/56245/
4028 [56365]: https://github.com/rust-lang/rust/pull/56365/
4029 [56366]: https://github.com/rust-lang/rust/pull/56366/
4030 [56395]: https://github.com/rust-lang/rust/pull/56395/
4031 [56759]: https://github.com/rust-lang/rust/pull/56759/
4032 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
4033 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
4034 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
4035 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
4036 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
4037 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4038 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4039 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
4040 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
4041 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
4042 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
4043 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
4044 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
4045 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
4046 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
4047 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
4048 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
4049 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
4050 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
4051 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
4052 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
4053 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
4054 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
4055 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
4056 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
4057 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
4058 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
4059 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
4060 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
4061 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
4062 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
4063 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
4064 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
4065 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
4066 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
4067 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
4068 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
4069 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
4070 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
4071 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
4072 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
4073 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
4074 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
4075 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
4076 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
4077 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
4078 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
4079 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
4080 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
4081 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
4082 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
4083 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
4084 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
4085 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
4086 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
4087 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
4088 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
4089 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
4090 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
4091 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
4092 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
4093 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
4094 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
4095 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
4096 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
4097 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
4098 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
4099 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
4100 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
4101 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
4102 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
4103 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
4104 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
4105 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
4106 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
4107 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
4108 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
4109 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
4110 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
4111 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
4112 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
4113 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
4114 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
4115 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
4116 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
4117 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
4118 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
4119 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
4120 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
4121 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
4122 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
4123 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
4124 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
4127 Version 1.31.1 (2018-12-20)
4128 ===========================
4130 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
4131 - [Fix broken go-to-definition in RLS][rls/1171]
4132 - [Fix infinite loop on hover in RLS][rls/1170]
4134 [56562]: https://github.com/rust-lang/rust/pull/56562
4135 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
4136 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
4138 Version 1.31.0 (2018-12-06)
4139 ==========================
4143 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
4144 - [New lifetime elision rules now allow for eliding lifetimes in functions and
4145 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
4146 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
4148 - [You can now define and use `const` functions.][54835] These are currently
4149 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
4150 [language reference][const-reference] for what exactly is available.
4151 - [You can now use tool lints, which allow you to scope lints from external
4152 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
4153 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
4154 a crate, not just in exported functions.][54451]
4155 - [You can now use parentheses in pattern matches.][54497]
4159 - [Updated musl to 1.1.20][54430]
4163 - [You can now convert `num::NonZero*` types to their raw equivalents using the
4164 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
4165 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
4166 into `Option<&mut T>` using the `From` trait.][53218]
4167 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
4172 - [`slice::align_to`]
4173 - [`slice::align_to_mut`]
4174 - [`slice::chunks_exact`]
4175 - [`slice::chunks_exact_mut`]
4176 - [`slice::rchunks`]
4177 - [`slice::rchunks_mut`]
4178 - [`slice::rchunks_exact`]
4179 - [`slice::rchunks_exact_mut`]
4180 - [`Option::replace`]
4184 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
4185 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
4186 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
4188 [52813]: https://github.com/rust-lang/rust/pull/52813/
4189 [53218]: https://github.com/rust-lang/rust/pull/53218/
4190 [54057]: https://github.com/rust-lang/rust/pull/54057/
4191 [54240]: https://github.com/rust-lang/rust/pull/54240/
4192 [54430]: https://github.com/rust-lang/rust/pull/54430/
4193 [54451]: https://github.com/rust-lang/rust/pull/54451/
4194 [54497]: https://github.com/rust-lang/rust/pull/54497/
4195 [54778]: https://github.com/rust-lang/rust/pull/54778/
4196 [54835]: https://github.com/rust-lang/rust/pull/54835/
4197 [54870]: https://github.com/rust-lang/rust/pull/54870/
4198 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
4199 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
4200 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
4201 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
4202 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
4203 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
4204 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4205 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
4206 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
4207 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
4208 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
4209 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
4210 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
4211 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
4213 Version 1.30.1 (2018-11-08)
4214 ===========================
4216 - [Fixed overflow ICE in rustdoc][54199]
4217 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
4219 [54199]: https://github.com/rust-lang/rust/pull/54199
4220 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
4222 Version 1.30.0 (2018-10-25)
4223 ==========================
4227 - [Procedural macros are now available.][52081] These kinds of macros allow for
4228 more powerful code generation. There is a [new chapter available][proc-macros]
4229 in the Rust Programming Language book that goes further in depth.
4230 - [You can now use keywords as identifiers using the raw identifiers
4231 syntax (`r#`),][53236] e.g. `let r#for = true;`
4232 - [Using anonymous parameters in traits is now deprecated with a warning and
4233 will be a hard error in the 2018 edition.][53272]
4234 - [You can now use `crate` in paths.][54404] This allows you to refer to the
4235 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
4236 - [Using a external crate no longer requires being prefixed with `::`.][54404]
4237 Previously, using a external crate in a module without a use statement
4238 required `let json = ::serde_json::from_str(foo);` but can now be written
4239 as `let json = serde_json::from_str(foo);`.
4240 - [You can now apply the `#[used]` attribute to static items to prevent the
4241 compiler from optimising them away, even if they appear to be unused,][51363]
4242 e.g. `#[used] static FOO: u32 = 1;`
4243 - [You can now import and reexport macros from other crates with the `use`
4244 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
4245 the root module of the crate. If your macro relies on calling other local
4246 macros, it is recommended to export with the
4247 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
4249 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
4250 using the `vis` specifier.][53370]
4251 - [Non-macro attributes now allow all forms of literals, not just
4252 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
4253 write `#[attr(true)]`.
4254 - [You can now specify a function to handle a panic in the Rust runtime with the
4255 `#[panic_handler]` attribute.][51366]
4259 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
4260 - [Added the `aarch64-unknown-netbsd` target][53165]
4261 - [Upgraded to LLVM 8.][53611]
4265 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
4269 - [`Ipv4Addr::BROADCAST`]
4270 - [`Ipv4Addr::LOCALHOST`]
4271 - [`Ipv4Addr::UNSPECIFIED`]
4272 - [`Ipv6Addr::LOCALHOST`]
4273 - [`Ipv6Addr::UNSPECIFIED`]
4274 - [`Iterator::find_map`]
4276 The following methods are replacement methods for `trim_left`, `trim_right`,
4277 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
4279 - [`str::trim_end_matches`]
4281 - [`str::trim_start_matches`]
4282 - [`str::trim_start`]
4286 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
4287 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
4288 equivalent to calling `rustdoc --error-format=json`.
4289 - [Cargo will now provide a progress bar for builds.][cargo/5995]
4293 - [`rustdoc` allows you to specify what edition to treat your code as with the
4294 `--edition` option.][54057]
4295 - [`rustdoc` now has the `--color` (specify whether to output color) and
4296 `--error-format` (specify error format, e.g. `json`) options.][53003]
4297 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
4298 debug symbols.][53774]
4299 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
4300 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
4302 [50911]: https://github.com/rust-lang/rust/pull/50911/
4303 [51363]: https://github.com/rust-lang/rust/pull/51363/
4304 [51366]: https://github.com/rust-lang/rust/pull/51366/
4305 [52081]: https://github.com/rust-lang/rust/pull/52081/
4306 [53003]: https://github.com/rust-lang/rust/pull/53003/
4307 [53033]: https://github.com/rust-lang/rust/pull/53033/
4308 [53044]: https://github.com/rust-lang/rust/pull/53044/
4309 [53165]: https://github.com/rust-lang/rust/pull/53165/
4310 [53611]: https://github.com/rust-lang/rust/pull/53611/
4311 [53236]: https://github.com/rust-lang/rust/pull/53236/
4312 [53272]: https://github.com/rust-lang/rust/pull/53272/
4313 [53370]: https://github.com/rust-lang/rust/pull/53370/
4314 [53459]: https://github.com/rust-lang/rust/pull/53459/
4315 [53774]: https://github.com/rust-lang/rust/pull/53774/
4316 [53822]: https://github.com/rust-lang/rust/pull/53822/
4317 [54057]: https://github.com/rust-lang/rust/pull/54057/
4318 [54404]: https://github.com/rust-lang/rust/pull/54404/
4319 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
4320 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
4321 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
4322 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
4324 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
4325 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
4326 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
4327 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
4328 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
4329 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
4330 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
4331 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
4332 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
4333 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
4336 Version 1.29.2 (2018-10-11)
4337 ===========================
4339 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
4340 - The `rls-preview` component on the windows-gnu targets has been restored.
4342 [54639]: https://github.com/rust-lang/rust/pull/54639
4345 Version 1.29.1 (2018-09-25)
4346 ===========================
4351 - The standard library's `str::repeat` function contained an out of bounds write
4352 caused by an integer overflow. This has been fixed by deterministically
4353 panicking when an overflow happens.
4355 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
4359 Version 1.29.0 (2018-09-13)
4360 ==========================
4364 - [Bumped minimum LLVM version to 5.0.][51899]
4365 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
4366 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
4367 - [Upgraded to LLVM 7.][51966]
4371 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
4372 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
4373 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
4374 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
4376 - [`Cell<T>` now allows `T` to be unsized.][50494]
4377 - [`SocketAddr` is now stable on Redox.][52656]
4382 - [`Iterator::flatten`]
4387 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
4388 `--locked` to disable this behavior.
4389 - [`cargo-install` will now allow you to cross compile an install
4390 using `--target`.][cargo/5614]
4391 - [Added the `cargo-fix` subcommand to automatically move project code from
4392 2015 edition to 2018.][cargo/5723]
4393 - [`cargo doc` can now optionally document private types using the
4394 `--document-private-items` flag.][cargo/5543]
4398 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
4399 the specified level to that level.][52354] For example `--cap-lints warn`
4400 will demote `deny` and `forbid` lints to `warn`.
4401 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
4402 fails and `101` if there is a panic.][52197]
4403 - [A preview of clippy has been made available through rustup.][51122]
4404 You can install the preview with `rustup component add clippy-preview`.
4408 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
4409 Use `str::get_unchecked(begin..end)` instead.
4410 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
4411 Consider using the `home_dir` function from
4412 https://crates.io/crates/dirs instead.
4413 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
4414 - [`cfg` attributes and `--cfg` command line flags are now more
4415 strictly validated.][53893]
4417 [53893]: https://github.com/rust-lang/rust/pull/53893/
4418 [52861]: https://github.com/rust-lang/rust/pull/52861/
4419 [51966]: https://github.com/rust-lang/rust/pull/51966/
4420 [52656]: https://github.com/rust-lang/rust/pull/52656/
4421 [52239]: https://github.com/rust-lang/rust/pull/52239/
4422 [52330]: https://github.com/rust-lang/rust/pull/52330/
4423 [52354]: https://github.com/rust-lang/rust/pull/52354/
4424 [52402]: https://github.com/rust-lang/rust/pull/52402/
4425 [52197]: https://github.com/rust-lang/rust/pull/52197/
4426 [51807]: https://github.com/rust-lang/rust/pull/51807/
4427 [51899]: https://github.com/rust-lang/rust/pull/51899/
4428 [51912]: https://github.com/rust-lang/rust/pull/51912/
4429 [51619]: https://github.com/rust-lang/rust/pull/51619/
4430 [51656]: https://github.com/rust-lang/rust/pull/51656/
4431 [51178]: https://github.com/rust-lang/rust/pull/51178/
4432 [51122]: https://github.com/rust-lang/rust/pull/51122
4433 [50494]: https://github.com/rust-lang/rust/pull/50494/
4434 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
4435 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
4436 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
4437 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
4438 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
4439 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
4440 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
4443 Version 1.28.0 (2018-08-02)
4444 ===========================
4448 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
4449 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
4450 the inner type across Foreign Function Interface (FFI) boundaries.
4451 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
4452 and can now be used as identifiers.][51196]
4453 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
4454 stable.][51241] This will allow users to specify a global allocator for
4456 - [Unit test functions marked with the `#[test]` attribute can now return
4457 `Result<(), E: Debug>` in addition to `()`.][51298]
4458 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
4459 allows macros to easily target lifetimes.
4463 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
4464 prioritise making smaller binary sizes. `z` is the same as `s` with the
4465 exception that it does not vectorise loops, which typically results in an even
4467 - [The short error format is now stable.][49546] Specified with
4468 `--error-format=short` this option will provide a more compressed output of
4469 rust error messages.
4470 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
4471 - [Reduced the number of allocations in the macro parser.][50855] This can
4472 improve compile times of macro heavy crates on average by 5%.
4476 - [Implemented `Default` for `&mut str`.][51306]
4477 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
4478 - [Implemented `Extend` for `()`.][50234]
4479 - [The `Debug` implementation of `time::Duration` should now be more easily
4480 human readable.][50364] Previously a `Duration` of one second would printed as
4481 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
4482 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
4483 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
4484 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
4485 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
4486 for `PathBuf`.][50170]
4487 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
4488 and `Wrapping<i128>`.][50465]
4489 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
4490 possible.][51050] This can provide up to a 40% speed increase.
4491 - [Improved error messages when using `format!`.][50610]
4495 - [`Iterator::step_by`]
4496 - [`Path::ancestors`]
4497 - [`SystemTime::UNIX_EPOCH`]
4498 - [`alloc::GlobalAlloc`]
4500 - [`alloc::LayoutErr`]
4503 - [`alloc::alloc_zeroed`]
4504 - [`alloc::dealloc`]
4505 - [`alloc::realloc`]
4506 - [`alloc::handle_alloc_error`]
4507 - [`btree_map::Entry::or_default`]
4508 - [`fmt::Alignment`]
4509 - [`hash_map::Entry::or_default`]
4510 - [`iter::repeat_with`]
4511 - [`num::NonZeroUsize`]
4512 - [`num::NonZeroU128`]
4513 - [`num::NonZeroU16`]
4514 - [`num::NonZeroU32`]
4515 - [`num::NonZeroU64`]
4516 - [`num::NonZeroU8`]
4517 - [`ops::RangeBounds`]
4518 - [`slice::SliceIndex`]
4519 - [`slice::from_mut`]
4520 - [`slice::from_ref`]
4521 - [`{Any + Send + Sync}::downcast_mut`]
4522 - [`{Any + Send + Sync}::downcast_ref`]
4523 - [`{Any + Send + Sync}::is`]
4527 - [Cargo will now no longer allow you to publish crates with build scripts that
4528 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
4529 considered to be immutable.
4533 - [The `suggestion_applicability` field in `rustc`'s json output is now
4534 stable.][50486] This will allow dev tools to check whether a code suggestion
4535 would apply to them.
4539 - [Rust will consider trait objects with duplicated constraints to be the same
4540 type as without the duplicated constraint.][51276] For example the below code will
4541 now fail to compile.
4546 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
4549 impl Trait + Send + Send {
4550 fn test(&self) { println!("two"); }
4554 [49546]: https://github.com/rust-lang/rust/pull/49546/
4555 [50143]: https://github.com/rust-lang/rust/pull/50143/
4556 [50170]: https://github.com/rust-lang/rust/pull/50170/
4557 [50234]: https://github.com/rust-lang/rust/pull/50234/
4558 [50265]: https://github.com/rust-lang/rust/pull/50265/
4559 [50364]: https://github.com/rust-lang/rust/pull/50364/
4560 [50385]: https://github.com/rust-lang/rust/pull/50385/
4561 [50465]: https://github.com/rust-lang/rust/pull/50465/
4562 [50486]: https://github.com/rust-lang/rust/pull/50486/
4563 [50554]: https://github.com/rust-lang/rust/pull/50554/
4564 [50610]: https://github.com/rust-lang/rust/pull/50610/
4565 [50855]: https://github.com/rust-lang/rust/pull/50855/
4566 [51050]: https://github.com/rust-lang/rust/pull/51050/
4567 [51196]: https://github.com/rust-lang/rust/pull/51196/
4568 [51241]: https://github.com/rust-lang/rust/pull/51241/
4569 [51276]: https://github.com/rust-lang/rust/pull/51276/
4570 [51298]: https://github.com/rust-lang/rust/pull/51298/
4571 [51306]: https://github.com/rust-lang/rust/pull/51306/
4572 [51562]: https://github.com/rust-lang/rust/pull/51562/
4573 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
4574 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
4575 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
4576 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
4577 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
4578 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
4579 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
4580 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
4581 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
4582 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
4583 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
4584 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
4585 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
4586 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
4587 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
4588 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
4589 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
4590 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
4591 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
4592 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
4593 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
4594 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
4595 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
4596 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
4597 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
4598 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
4599 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
4600 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
4601 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
4602 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
4604 Version 1.27.2 (2018-07-20)
4605 ===========================
4610 - The borrow checker was fixed to avoid potential unsoundness when using
4611 match ergonomics: [#52213][52213].
4613 [52213]: https://github.com/rust-lang/rust/issues/52213
4615 Version 1.27.1 (2018-07-10)
4616 ===========================
4621 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
4622 when running, which enabled executing code as some other user on a
4623 given machine. This release fixes that vulnerability; you can read
4624 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
4626 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
4631 - The borrow checker was fixed to avoid an additional potential unsoundness when using
4632 match ergonomics: [#51415][51415], [#49534][49534].
4634 [51415]: https://github.com/rust-lang/rust/issues/51415
4635 [49534]: https://github.com/rust-lang/rust/issues/49534
4636 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
4637 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
4639 Version 1.27.0 (2018-06-21)
4640 ==========================
4644 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
4645 be used as an identifier.
4646 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
4647 bare `Trait` syntax, and should make it clearer when being used in tandem with
4648 `impl Trait` because it is equivalent to the following syntax:
4649 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
4650 `Box<Trait> == Box<dyn Trait>`.
4651 - [Attributes on generic parameters such as types and lifetimes are
4652 now stable.][48851] e.g.
4653 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
4654 - [The `#[must_use]` attribute can now also be used on functions as well as
4655 types.][48925] It provides a lint that by default warns users when the
4656 value returned by a function has not been used.
4660 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
4664 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
4665 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
4666 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
4667 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
4668 the `cfg` attribute.
4669 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
4670 std are now available in core.][49896]
4671 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
4673 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
4674 that the operation isn't done in place.
4675 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
4676 the `#[must_use]` attribute][49533] to warn about unused potentially
4677 expensive allocations.
4681 - [`DoubleEndedIterator::rfind`]
4682 - [`DoubleEndedIterator::rfold`]
4683 - [`DoubleEndedIterator::try_rfold`]
4684 - [`Duration::from_micros`]
4685 - [`Duration::from_nanos`]
4686 - [`Duration::subsec_micros`]
4687 - [`Duration::subsec_millis`]
4688 - [`HashMap::remove_entry`]
4689 - [`Iterator::try_fold`]
4690 - [`Iterator::try_for_each`]
4692 - [`Option::filter`]
4693 - [`String::replace_range`]
4694 - [`Take::set_limit`]
4695 - [`hint::unreachable_unchecked`]
4696 - [`os::unix::process::parent_id`]
4697 - [`ptr::swap_nonoverlapping`]
4698 - [`slice::rsplit_mut`]
4700 - [`slice::swap_with_slice`]
4704 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
4705 `readme`, and `repository` fields.][cargo/5386]
4706 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
4707 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
4708 a different directory than `target` for placing compilation artifacts.
4709 - [Cargo will be adding automatic target inference for binaries, benchmarks,
4710 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
4711 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
4712 where cargo would infer a binary, Cargo will produce a warning. You can
4713 disable this feature ahead of time by setting any of the following to false:
4714 `autobins`, `autobenches`, `autoexamples`, `autotests`.
4715 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
4716 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
4720 - [Added “The Rustc book” into the official documentation.][49707]
4721 [“The Rustc book”] documents and teaches how to use the rustc compiler.
4722 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
4726 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
4727 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
4728 compile, `"".is_empty()` will still compile.
4729 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
4730 will only print the inner type.][48553] E.g.
4731 `print!("{:?}", AtomicBool::new(true))` will print `true`,
4732 not `AtomicBool(true)`.
4733 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
4734 could enter higher numbers but they were not supported by LLVM. Up to 512MB
4735 alignment should cover all use cases.
4736 - The `.description()` method on the `std::error::Error` trait
4737 [has been soft-deprecated][50163]. It is no longer required to implement it.
4739 [48553]: https://github.com/rust-lang/rust/pull/48553/
4740 [48851]: https://github.com/rust-lang/rust/pull/48851/
4741 [48925]: https://github.com/rust-lang/rust/pull/48925/
4742 [49533]: https://github.com/rust-lang/rust/pull/49533/
4743 [49623]: https://github.com/rust-lang/rust/pull/49623/
4744 [49630]: https://github.com/rust-lang/rust/pull/49630/
4745 [49664]: https://github.com/rust-lang/rust/pull/49664/
4746 [49699]: https://github.com/rust-lang/rust/pull/49699/
4747 [49707]: https://github.com/rust-lang/rust/pull/49707/
4748 [49896]: https://github.com/rust-lang/rust/pull/49896/
4749 [49968]: https://github.com/rust-lang/rust/pull/49968/
4750 [50163]: https://github.com/rust-lang/rust/pull/50163
4751 [50177]: https://github.com/rust-lang/rust/pull/50177/
4752 [50378]: https://github.com/rust-lang/rust/pull/50378/
4753 [50423]: https://github.com/rust-lang/rust/pull/50423/
4754 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
4755 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
4756 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
4757 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
4758 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
4759 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
4760 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
4761 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
4762 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
4763 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
4764 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
4765 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
4766 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
4767 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
4768 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
4769 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
4770 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
4771 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
4772 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
4773 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
4774 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
4775 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
4776 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
4777 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
4778 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
4779 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
4780 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
4781 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
4782 [“The Rustc book”]: https://doc.rust-lang.org/rustc
4785 Version 1.26.2 (2018-06-05)
4786 ==========================
4791 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
4793 [51117]: https://github.com/rust-lang/rust/issues/51117
4796 Version 1.26.1 (2018-05-29)
4797 ==========================
4802 - [RLS now works on Windows.][50646]
4803 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
4809 - [`fn main() -> impl Trait` no longer works for non-Termination
4811 This reverts an accidental stabilization.
4812 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
4813 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
4815 [50646]: https://github.com/rust-lang/rust/issues/50646
4816 [50656]: https://github.com/rust-lang/rust/pull/50656
4817 [50812]: https://github.com/rust-lang/rust/pull/50812
4818 [50950]: https://github.com/rust-lang/rust/issues/50950
4819 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
4821 Version 1.26.0 (2018-05-10)
4822 ==========================
4826 - [Closures now implement `Copy` and/or `Clone` if all captured variables
4827 implement either or both traits.][49299]
4828 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
4829 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
4830 lifetime can be elided.][49458]
4831 - [`impl Trait` is now stable allowing you to have abstract types in returns
4832 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
4833 `fn open(path: impl AsRef<Path>)`.
4834 - [Pattern matching will now automatically apply dereferences.][49394]
4835 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
4836 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
4837 - [A lot of operations are now available in a const context.][46882] E.g. You
4838 can now index into constant arrays, reference and dereference into constants,
4839 and use tuple struct constructors.
4840 - [Fixed entry slice patterns are now stable.][48516] E.g.
4842 let points = [1, 2, 3, 4];
4844 [1, 2, 3, 4] => println!("All points were sequential."),
4845 _ => println!("Not all points were sequential."),
4852 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
4853 - [Fixed exponential projection complexity on nested types.][48296]
4854 This can provide up to a ~12% reduction in compile times for certain crates.
4855 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
4856 to remap path prefixes outputted by the compiler.
4857 - [Added `powerpc-unknown-netbsd` target.][48281]
4861 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
4862 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
4863 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
4864 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
4865 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
4866 - [`ascii::escape_default` is now available in libcore.][48735]
4867 - [Trailing commas are now supported in std and core macros.][48056]
4868 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
4869 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
4874 - [`*const T::copy_to_nonoverlapping`]
4875 - [`*const T::copy_to`]
4876 - [`*const T::read_unaligned`]
4877 - [`*const T::read_volatile`]
4878 - [`*const T::read`]
4880 - [`*const T::wrapping_add`]
4881 - [`*const T::wrapping_sub`]
4883 - [`*mut T::copy_to_nonoverlapping`]
4884 - [`*mut T::copy_to`]
4885 - [`*mut T::read_unaligned`]
4886 - [`*mut T::read_volatile`]
4888 - [`*mut T::replace`]
4891 - [`*mut T::wrapping_add`]
4892 - [`*mut T::wrapping_sub`]
4893 - [`*mut T::write_bytes`]
4894 - [`*mut T::write_unaligned`]
4895 - [`*mut T::write_volatile`]
4898 - [`FromUtf8Error::as_bytes`]
4899 - [`LocalKey::try_with`]
4900 - [`Option::cloned`]
4901 - [`btree_map::Entry::and_modify`]
4902 - [`fs::read_to_string`]
4905 - [`hash_map::Entry::and_modify`]
4906 - [`iter::FusedIterator`]
4907 - [`ops::RangeInclusive`]
4908 - [`ops::RangeToInclusive`]
4910 - [`slice::rotate_left`]
4911 - [`slice::rotate_right`]
4912 - [`String::retain`]
4917 - [Cargo will now output path to custom commands when `-v` is
4918 passed with `--list`][cargo/5041]
4919 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
4923 - [The second edition of "The Rust Programming Language" book is now recommended
4924 over the first.][48404]
4929 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
4930 syntax is now invalid.
4932 use std::ops::Fn as dyn;
4933 fn g(_: Box<dyn(std::fmt::Debug)>) {}
4935 - [The result of dereferences are no longer promoted to `'static`.][47408]
4939 const PAIR: &(i32, i32) = &(0, 1);
4940 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
4943 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
4944 - [`".e0"` will now no longer parse as `0.0` and will instead cause
4946 - [Removed hoedown from rustdoc.][48274]
4947 - [Bounds on higher-kinded lifetimes a hard error.][48326]
4949 [46882]: https://github.com/rust-lang/rust/pull/46882
4950 [47379]: https://github.com/rust-lang/rust/pull/47379
4951 [47408]: https://github.com/rust-lang/rust/pull/47408
4952 [47813]: https://github.com/rust-lang/rust/pull/47813
4953 [48056]: https://github.com/rust-lang/rust/pull/48056
4954 [48125]: https://github.com/rust-lang/rust/pull/48125
4955 [48235]: https://github.com/rust-lang/rust/pull/48235
4956 [48274]: https://github.com/rust-lang/rust/pull/48274
4957 [48281]: https://github.com/rust-lang/rust/pull/48281
4958 [48296]: https://github.com/rust-lang/rust/pull/48296
4959 [48326]: https://github.com/rust-lang/rust/pull/48326
4960 [48359]: https://github.com/rust-lang/rust/pull/48359
4961 [48404]: https://github.com/rust-lang/rust/pull/48404
4962 [48481]: https://github.com/rust-lang/rust/pull/48481
4963 [48516]: https://github.com/rust-lang/rust/pull/48516
4964 [48628]: https://github.com/rust-lang/rust/pull/48628
4965 [48629]: https://github.com/rust-lang/rust/pull/48629
4966 [48657]: https://github.com/rust-lang/rust/pull/48657
4967 [48735]: https://github.com/rust-lang/rust/pull/48735
4968 [48978]: https://github.com/rust-lang/rust/pull/48978
4969 [49101]: https://github.com/rust-lang/rust/pull/49101
4970 [49109]: https://github.com/rust-lang/rust/pull/49109
4971 [49162]: https://github.com/rust-lang/rust/pull/49162
4972 [49255]: https://github.com/rust-lang/rust/pull/49255
4973 [49299]: https://github.com/rust-lang/rust/pull/49299
4974 [49305]: https://github.com/rust-lang/rust/pull/49305
4975 [49394]: https://github.com/rust-lang/rust/pull/49394
4976 [49458]: https://github.com/rust-lang/rust/pull/49458
4977 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
4978 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
4979 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
4980 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
4981 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
4982 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
4983 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
4984 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
4985 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
4986 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
4987 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
4988 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
4989 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
4990 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
4991 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
4992 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
4993 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
4994 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
4995 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
4996 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
4997 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
4998 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
4999 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
5000 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
5001 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
5002 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
5003 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
5004 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
5005 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
5006 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
5007 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
5008 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
5009 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
5010 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
5011 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
5012 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
5013 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
5014 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
5015 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
5016 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
5017 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
5018 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
5021 Version 1.25.0 (2018-03-29)
5022 ==========================
5026 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
5027 - [You can now use nested groups of imports.][47948]
5028 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
5029 - [You can now have `|` at the start of a match arm.][47947] e.g.
5031 enum Foo { A, B, C }
5037 | Foo::B => println!("AB"),
5038 | Foo::C => println!("C"),
5045 - [Upgraded to LLVM 6.][47828]
5046 - [Added `-C lto=val` option.][47521]
5047 - [Added `i586-unknown-linux-musl` target][47282]
5051 - [Impl Send for `process::Command` on Unix.][47760]
5052 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
5053 - [`UnsafeCell::into_inner` is now safe.][47204]
5054 - [Implement libstd for CloudABI.][47268]
5055 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
5056 - [Implement `AsRef<Path>` for Component][46985]
5057 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
5058 - [Moved `Duration` to libcore.][46666]
5062 - [`Location::column`]
5065 The following functions can now be used in a constant expression.
5066 eg. `static MINUTE: Duration = Duration::from_secs(60);`
5067 - [`Duration::new`][47300]
5068 - [`Duration::from_secs`][47300]
5069 - [`Duration::from_millis`][47300]
5073 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
5074 - [`cargo new` now defaults to creating a binary crate, instead of a
5075 library crate.][cargo/5029]
5079 - [Rust by example is now shipped with new releases][46196]
5083 - [Deprecated `net::lookup_host`.][47510]
5084 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
5085 - The borrow checker was sometimes incorrectly permitting overlapping borrows
5086 around indexing operations (see [#47349][47349]). This has been fixed (which also
5087 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
5088 - [Removed deprecated unstable attribute `#[simd]`.][47251]
5090 [33903]: https://github.com/rust-lang/rust/pull/33903
5091 [47947]: https://github.com/rust-lang/rust/pull/47947
5092 [47948]: https://github.com/rust-lang/rust/pull/47948
5093 [47760]: https://github.com/rust-lang/rust/pull/47760
5094 [47790]: https://github.com/rust-lang/rust/pull/47790
5095 [47828]: https://github.com/rust-lang/rust/pull/47828
5096 [47398]: https://github.com/rust-lang/rust/pull/47398
5097 [47510]: https://github.com/rust-lang/rust/pull/47510
5098 [47521]: https://github.com/rust-lang/rust/pull/47521
5099 [47204]: https://github.com/rust-lang/rust/pull/47204
5100 [47251]: https://github.com/rust-lang/rust/pull/47251
5101 [47268]: https://github.com/rust-lang/rust/pull/47268
5102 [47282]: https://github.com/rust-lang/rust/pull/47282
5103 [47300]: https://github.com/rust-lang/rust/pull/47300
5104 [47349]: https://github.com/rust-lang/rust/pull/47349
5105 [46931]: https://github.com/rust-lang/rust/pull/46931
5106 [46985]: https://github.com/rust-lang/rust/pull/46985
5107 [47006]: https://github.com/rust-lang/rust/pull/47006
5108 [46830]: https://github.com/rust-lang/rust/pull/46830
5109 [46095]: https://github.com/rust-lang/rust/pull/46095
5110 [46666]: https://github.com/rust-lang/rust/pull/46666
5111 [46196]: https://github.com/rust-lang/rust/pull/46196
5112 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
5113 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
5114 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
5115 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
5116 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
5119 Version 1.24.1 (2018-03-01)
5120 ==========================
5122 - [Do not abort when unwinding through FFI][48251]
5123 - [Emit UTF-16 files for linker arguments on Windows][48318]
5124 - [Make the error index generator work again][48308]
5125 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
5127 [48251]: https://github.com/rust-lang/rust/issues/48251
5128 [48308]: https://github.com/rust-lang/rust/issues/48308
5129 [48318]: https://github.com/rust-lang/rust/issues/48318
5130 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
5133 Version 1.24.0 (2018-02-15)
5134 ==========================
5138 - [External `sysv64` ffi is now available.][46528]
5139 eg. `extern "sysv64" fn foo () {}`
5143 - [rustc now uses 16 codegen units by default for release builds.][46910]
5144 For the fastest builds, utilize `codegen-units=1`.
5145 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
5146 - [Add `aarch64-unknown-openbsd` support][46760]
5150 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
5151 improvement in performance in the majority of cases.
5152 - [`OsStr`'s `Debug` implementation is now lossless and consistent
5153 with Windows.][46798]
5154 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
5155 - [impl `From<bool>` for `AtomicBool`][46293]
5156 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
5157 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
5158 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
5159 - [float::from_bits now just uses transmute.][46012] This provides
5160 some optimisations from LLVM.
5161 - [Copied `AsciiExt` methods onto `char`][46077]
5162 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
5163 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
5164 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
5165 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
5169 - [`RefCell::replace`]
5171 - [`atomic::spin_loop_hint`]
5173 The following functions can now be used in a constant expression.
5174 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
5176 - [`AtomicBool::new`][46287]
5177 - [`AtomicUsize::new`][46287]
5178 - [`AtomicIsize::new`][46287]
5179 - [`AtomicPtr::new`][46287]
5180 - [`Cell::new`][46287]
5181 - [`{integer}::min_value`][46287]
5182 - [`{integer}::max_value`][46287]
5183 - [`mem::size_of`][46287]
5184 - [`mem::align_of`][46287]
5185 - [`ptr::null`][46287]
5186 - [`ptr::null_mut`][46287]
5187 - [`RefCell::new`][46287]
5188 - [`UnsafeCell::new`][46287]
5192 - [Added a `workspace.default-members` config that
5193 overrides implied `--all` in virtual workspaces.][cargo/4743]
5194 - [Enable incremental by default on development builds.][cargo/4817] Also added
5195 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
5196 per-project or global basis respectively.
5203 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
5204 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
5205 in accordance with IETF RFC 4291 §2.2.
5206 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
5207 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
5208 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
5209 - [Leading zeros in tuple struct members is now an error][47084]
5210 - [`column!()` macro is one-based instead of zero-based][46977]
5211 - [`fmt::Arguments` can no longer be shared across threads][45198]
5212 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
5213 - [Cargo sets a different working directory for the compiler][cargo/4788]
5215 [44884]: https://github.com/rust-lang/rust/pull/44884
5216 [45198]: https://github.com/rust-lang/rust/pull/45198
5217 [45506]: https://github.com/rust-lang/rust/pull/45506
5218 [45990]: https://github.com/rust-lang/rust/pull/45990
5219 [46012]: https://github.com/rust-lang/rust/pull/46012
5220 [46077]: https://github.com/rust-lang/rust/pull/46077
5221 [46094]: https://github.com/rust-lang/rust/pull/46094
5222 [46284]: https://github.com/rust-lang/rust/pull/46284
5223 [46287]: https://github.com/rust-lang/rust/pull/46287
5224 [46293]: https://github.com/rust-lang/rust/pull/46293
5225 [46528]: https://github.com/rust-lang/rust/pull/46528
5226 [46671]: https://github.com/rust-lang/rust/pull/46671
5227 [46713]: https://github.com/rust-lang/rust/pull/46713
5228 [46735]: https://github.com/rust-lang/rust/pull/46735
5229 [46760]: https://github.com/rust-lang/rust/pull/46760
5230 [46798]: https://github.com/rust-lang/rust/pull/46798
5231 [46828]: https://github.com/rust-lang/rust/pull/46828
5232 [46831]: https://github.com/rust-lang/rust/pull/46831
5233 [46833]: https://github.com/rust-lang/rust/pull/46833
5234 [46910]: https://github.com/rust-lang/rust/pull/46910
5235 [46977]: https://github.com/rust-lang/rust/pull/46977
5236 [47018]: https://github.com/rust-lang/rust/pull/47018
5237 [47080]: https://github.com/rust-lang/rust/pull/47080
5238 [47084]: https://github.com/rust-lang/rust/pull/47084
5239 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
5240 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
5241 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
5242 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
5243 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
5244 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
5247 Version 1.23.0 (2018-01-04)
5248 ==========================
5252 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
5253 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
5254 Which should fix some confusing errors in some operations.
5258 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
5259 undefined behavior.][45920]
5260 - [rustc now suggests renaming import if names clash.][45660]
5261 - [Display errors/warnings correctly when there are zero-width or
5262 wide characters.][45711]
5263 - [rustc now avoids unnecessary copies of arguments that are
5264 simple bindings][45380] This should improve memory usage on average by 5-10%.
5265 - [Updated musl used to build musl rustc to 1.1.17][45393]
5269 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
5270 - [Implement Hash for raw pointers to unsized types][45483]
5271 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
5272 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
5273 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
5274 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
5275 and `<*mut T>::as_mut`][44932]
5276 - [Optimized `Thread::{park, unpark}` implementation][45524]
5277 - [Improved `SliceExt::binary_search` performance.][45333]
5278 - [impl `FromIterator<()>` for `()`][45379]
5279 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
5287 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
5288 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
5289 - [Added unit test checking to `cargo check`][cargo/4592]
5290 - [Cargo now lets you install a specific version
5291 using `cargo install --version`][cargo/4637]
5295 - [Releases now ship with the Cargo book documentation.][45692]
5296 - [rustdoc now prints rendering warnings on every run.][45324]
5300 - [Changes have been made to type equality to make it more correct,
5301 in rare cases this could break some code.][45853] [Tracking issue for
5302 further information][45852]
5303 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
5304 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
5305 Android 9, the minimum supported version is Android 14.
5306 - [Bumped the minimum LLVM to 3.9][45326]
5308 [44042]: https://github.com/rust-lang/rust/pull/44042
5309 [44932]: https://github.com/rust-lang/rust/pull/44932
5310 [45267]: https://github.com/rust-lang/rust/pull/45267
5311 [45324]: https://github.com/rust-lang/rust/pull/45324
5312 [45326]: https://github.com/rust-lang/rust/pull/45326
5313 [45333]: https://github.com/rust-lang/rust/pull/45333
5314 [45379]: https://github.com/rust-lang/rust/pull/45379
5315 [45380]: https://github.com/rust-lang/rust/pull/45380
5316 [45393]: https://github.com/rust-lang/rust/pull/45393
5317 [45435]: https://github.com/rust-lang/rust/pull/45435
5318 [45483]: https://github.com/rust-lang/rust/pull/45483
5319 [45524]: https://github.com/rust-lang/rust/pull/45524
5320 [45571]: https://github.com/rust-lang/rust/pull/45571
5321 [45580]: https://github.com/rust-lang/rust/pull/45580
5322 [45610]: https://github.com/rust-lang/rust/pull/45610
5323 [45660]: https://github.com/rust-lang/rust/pull/45660
5324 [45692]: https://github.com/rust-lang/rust/pull/45692
5325 [45711]: https://github.com/rust-lang/rust/pull/45711
5326 [45772]: https://github.com/rust-lang/rust/pull/45772
5327 [45852]: https://github.com/rust-lang/rust/issues/45852
5328 [45853]: https://github.com/rust-lang/rust/pull/45853
5329 [45887]: https://github.com/rust-lang/rust/pull/45887
5330 [45920]: https://github.com/rust-lang/rust/pull/45920
5331 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
5332 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
5333 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
5336 Version 1.22.1 (2017-11-22)
5337 ==========================
5339 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
5341 [46183]: https://github.com/rust-lang/rust/pull/46183
5343 Version 1.22.0 (2017-11-22)
5344 ==========================
5348 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
5349 - [Now accepts underscores in unicode escapes][43716]
5350 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
5351 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
5355 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
5356 - [rustc will no longer inline in codegen units when compiling for debug][45075]
5357 This should decrease compile times for debug builds.
5358 - [strict memory alignment now enabled on ARMv6][45094]
5359 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
5363 - [Allow atomic operations up to 32 bits
5364 on `armv5te_unknown_linux_gnueabi`][44978]
5365 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
5366 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
5367 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
5368 - [Properly detect overflow in `Instant += Duration`.][44220]
5369 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
5370 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
5371 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
5378 - [Cargo will now build multi file examples in subdirectories of the `examples`
5379 folder that have a `main.rs` file.][cargo/4496]
5380 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
5381 the old format will continue to work and can be updated with `cargo update`.
5382 - [Now supports vendoring git repositories][cargo/3992]
5386 - [`libbacktrace` is now available on Apple platforms.][44251]
5387 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
5388 This now lets you specify that a given code example will fail to compile.
5392 - [The minimum Android version that rustc can build for has been bumped
5393 to `4.0` from `2.3`][45656]
5394 - [Allowing `T op= &T` for numeric types has broken some type
5395 inference cases][45480]
5398 [42526]: https://github.com/rust-lang/rust/pull/42526
5399 [43716]: https://github.com/rust-lang/rust/pull/43716
5400 [43949]: https://github.com/rust-lang/rust/pull/43949
5401 [44015]: https://github.com/rust-lang/rust/pull/44015
5402 [44220]: https://github.com/rust-lang/rust/pull/44220
5403 [44251]: https://github.com/rust-lang/rust/pull/44251
5404 [44287]: https://github.com/rust-lang/rust/pull/44287
5405 [44303]: https://github.com/rust-lang/rust/pull/44303
5406 [44456]: https://github.com/rust-lang/rust/pull/44456
5407 [44466]: https://github.com/rust-lang/rust/pull/44466
5408 [44895]: https://github.com/rust-lang/rust/pull/44895
5409 [44966]: https://github.com/rust-lang/rust/pull/44966
5410 [44978]: https://github.com/rust-lang/rust/pull/44978
5411 [45041]: https://github.com/rust-lang/rust/pull/45041
5412 [45064]: https://github.com/rust-lang/rust/pull/45064
5413 [45075]: https://github.com/rust-lang/rust/pull/45075
5414 [45094]: https://github.com/rust-lang/rust/pull/45094
5415 [45095]: https://github.com/rust-lang/rust/pull/45095
5416 [45480]: https://github.com/rust-lang/rust/issues/45480
5417 [45656]: https://github.com/rust-lang/rust/pull/45656
5418 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
5419 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
5420 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
5427 Version 1.21.0 (2017-10-12)
5428 ==========================
5432 - [You can now use static references for literals.][43838]
5436 let x: &'static u32 = &0;
5439 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
5442 my_macro!(Vec<i32>::new); // Always worked
5443 my_macro!(Vec::<i32>::new); // Now works
5448 - [Upgraded jemalloc to 4.5.0][43911]
5449 - [Enabled unwinding panics on Redox][43917]
5450 - [Now runs LLVM in parallel during translation phase.][43506]
5451 This should reduce peak memory usage.
5455 - [Generate builtin impls for `Clone` for all arrays and tuples that
5456 are `T: Clone`][43690]
5457 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
5458 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
5459 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
5464 [`std::mem::discriminant`]
5468 - [You can now call `cargo install` with multiple package names][cargo/4216]
5469 - [Cargo commands inside a virtual workspace will now implicitly
5470 pass `--all`][cargo/4335]
5471 - [Added a `[patch]` section to `Cargo.toml` to handle
5472 prepublication dependencies][cargo/4123] [RFC 1969]
5473 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
5474 like patterns][cargo/4270]
5475 - [Added the `--all-targets` option][cargo/4400]
5476 - [Using required dependencies as a feature is now deprecated and emits
5477 a warning][cargo/4364]
5482 - [Cargo docs are moving][43916]
5483 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
5484 - [The rustdoc book is now available][43863]
5485 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
5486 - [Added a preview of RLS has been made available through rustup][44204]
5487 Install with `rustup component add rls-preview`
5488 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
5489 Previously only showed `std::os::unix`.
5493 - [Changes in method matching against higher-ranked types][43880] This may cause
5494 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
5495 - [rustc's JSON error output's byte position start at top of file.][42973]
5496 Was previously relative to the rustc's internal `CodeMap` struct which
5497 required the unstable library `libsyntax` to correctly use.
5498 - [`unused_results` lint no longer ignores booleans][43728]
5500 [42565]: https://github.com/rust-lang/rust/pull/42565
5501 [42973]: https://github.com/rust-lang/rust/pull/42973
5502 [43348]: https://github.com/rust-lang/rust/pull/43348
5503 [43459]: https://github.com/rust-lang/rust/pull/43459
5504 [43506]: https://github.com/rust-lang/rust/pull/43506
5505 [43540]: https://github.com/rust-lang/rust/pull/43540
5506 [43690]: https://github.com/rust-lang/rust/pull/43690
5507 [43728]: https://github.com/rust-lang/rust/pull/43728
5508 [43838]: https://github.com/rust-lang/rust/pull/43838
5509 [43863]: https://github.com/rust-lang/rust/pull/43863
5510 [43880]: https://github.com/rust-lang/rust/pull/43880
5511 [43911]: https://github.com/rust-lang/rust/pull/43911
5512 [43916]: https://github.com/rust-lang/rust/pull/43916
5513 [43917]: https://github.com/rust-lang/rust/pull/43917
5514 [44204]: https://github.com/rust-lang/rust/pull/44204
5515 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
5516 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
5517 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
5518 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
5519 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
5520 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
5521 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
5522 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
5523 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
5525 Version 1.20.0 (2017-08-31)
5526 ===========================
5530 - [Associated constants are now stabilised.][42809]
5531 - [A lot of macro bugs are now fixed.][42913]
5536 - [Struct fields are now properly coerced to the expected field type.][42807]
5537 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
5538 `wasm32-experimental-emscripten` target.
5539 - [Changed some of the error messages to be more helpful.][42033]
5540 - [Add support for RELRO(RELocation Read-Only) for platforms that support
5542 - [rustc now reports the total number of errors on compilation failure][43015]
5543 previously this was only the number of errors in the pass that failed.
5544 - [Expansion in rustc has been sped up 29x.][42533]
5545 - [added `msp430-none-elf` target.][43099]
5546 - [rustc will now suggest one-argument enum variant to fix type mismatch when
5548 - [Fixes backtraces on Redox][43228]
5549 - [rustc now identifies different versions of same crate when absolute paths of
5550 different types match in an error message.][42826]
5556 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
5557 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
5559 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
5560 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
5561 - [Impl `Clone` for `DefaultHasher`.][42799]
5562 - [Impl `Sync` for `SyncSender`.][42397]
5563 - [Impl `FromStr` for `char`][42271]
5564 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
5566 - [allow messages in the `unimplemented!()` macro.][42155]
5567 ie. `unimplemented!("Waiting for 1.21 to be stable")`
5568 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
5569 - [Upgrade to Unicode 10.0.0][42999]
5570 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
5571 - [Skip the main thread's manual stack guard on Linux][43072]
5572 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in *O*(1) time][43077]
5573 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
5575 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
5580 - [`CStr::into_c_string`]
5581 - [`CString::as_c_str`]
5582 - [`CString::into_boxed_c_str`]
5583 - [`Chain::get_mut`]
5584 - [`Chain::get_ref`]
5585 - [`Chain::into_inner`]
5586 - [`Option::get_or_insert_with`]
5587 - [`Option::get_or_insert`]
5588 - [`OsStr::into_os_string`]
5589 - [`OsString::into_boxed_os_str`]
5592 - [`Utf8Error::error_len`]
5593 - [`char::EscapeDebug`]
5594 - [`char::escape_debug`]
5595 - [`compile_error!`]
5596 - [`f32::from_bits`]
5598 - [`f64::from_bits`]
5600 - [`mem::ManuallyDrop`]
5601 - [`slice::sort_unstable_by_key`]
5602 - [`slice::sort_unstable_by`]
5603 - [`slice::sort_unstable`]
5604 - [`str::from_boxed_utf8_unchecked`]
5605 - [`str::as_bytes_mut`]
5606 - [`str::as_bytes_mut`]
5607 - [`str::from_utf8_mut`]
5608 - [`str::from_utf8_unchecked_mut`]
5610 - [`str::get_unchecked_mut`]
5611 - [`str::get_unchecked`]
5613 - [`str::into_boxed_bytes`]
5618 - [Cargo API token location moved from `~/.cargo/config` to
5619 `~/.cargo/credentials`.][cargo/3978]
5620 - [Cargo will now build `main.rs` binaries that are in sub-directories of
5621 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
5622 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
5623 - [You can now specify version of a binary when installed through
5624 `cargo install` using `--vers`.][cargo/4229]
5625 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
5626 failure.][cargo/4248]
5627 - [Changed the convention around which file is the crate root.][cargo/4259]
5632 - [Functions with `'static` in their return types will now not be as usable as
5633 if they were using lifetime parameters instead.][42417]
5634 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
5635 takes the sign of NaN into account where previously didn't.][42430]
5637 [42033]: https://github.com/rust-lang/rust/pull/42033
5638 [42155]: https://github.com/rust-lang/rust/pull/42155
5639 [42271]: https://github.com/rust-lang/rust/pull/42271
5640 [42397]: https://github.com/rust-lang/rust/pull/42397
5641 [42417]: https://github.com/rust-lang/rust/pull/42417
5642 [42430]: https://github.com/rust-lang/rust/pull/42430
5643 [42431]: https://github.com/rust-lang/rust/pull/42431
5644 [42533]: https://github.com/rust-lang/rust/pull/42533
5645 [42571]: https://github.com/rust-lang/rust/pull/42571
5646 [42613]: https://github.com/rust-lang/rust/pull/42613
5647 [42799]: https://github.com/rust-lang/rust/pull/42799
5648 [42807]: https://github.com/rust-lang/rust/pull/42807
5649 [42809]: https://github.com/rust-lang/rust/pull/42809
5650 [42822]: https://github.com/rust-lang/rust/pull/42822
5651 [42826]: https://github.com/rust-lang/rust/pull/42826
5652 [42854]: https://github.com/rust-lang/rust/pull/42854
5653 [42913]: https://github.com/rust-lang/rust/pull/42913
5654 [42999]: https://github.com/rust-lang/rust/pull/42999
5655 [43011]: https://github.com/rust-lang/rust/pull/43011
5656 [43015]: https://github.com/rust-lang/rust/pull/43015
5657 [43072]: https://github.com/rust-lang/rust/pull/43072
5658 [43077]: https://github.com/rust-lang/rust/pull/43077
5659 [43097]: https://github.com/rust-lang/rust/pull/43097
5660 [43099]: https://github.com/rust-lang/rust/pull/43099
5661 [43170]: https://github.com/rust-lang/rust/pull/43170
5662 [43178]: https://github.com/rust-lang/rust/pull/43178
5663 [43185]: https://github.com/rust-lang/rust/pull/43185
5664 [43228]: https://github.com/rust-lang/rust/pull/43228
5665 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
5666 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
5667 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
5668 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
5669 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
5670 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
5671 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
5672 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
5673 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
5674 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
5675 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
5676 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
5677 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
5678 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
5679 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
5680 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
5681 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
5682 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
5683 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
5684 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
5685 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
5686 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
5687 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
5688 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
5689 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
5690 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
5691 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
5692 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
5693 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
5694 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
5695 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
5696 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
5697 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
5698 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
5699 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
5700 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
5701 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
5702 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
5705 Version 1.19.0 (2017-07-20)
5706 ===========================
5711 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
5712 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
5713 - [Macro recursion limit increased to 1024 from 64.][41676]
5714 - [Added lint for detecting unused macros.][41907]
5715 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
5716 For example: `let x = loop { break 7; };`
5717 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
5718 contain `Copy` types and cannot have a `Drop` implementation.
5719 Example: `union Foo { bar: u8, baz: usize }`
5720 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
5721 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
5726 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
5727 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
5728 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
5729 you should use `--target armv7-linux-androideabi`.
5730 - [Fixed ICE when removing a source file between compilation sessions.][41873]
5731 - [Minor optimisation of string operations.][42037]
5732 - [Compiler error message is now `aborting due to previous error(s)` instead of
5733 `aborting due to N previous errors`][42150] This was previously inaccurate and
5734 would only count certain kinds of errors.
5735 - [The compiler now supports Visual Studio 2017][42225]
5736 - [The compiler is now built against LLVM 4.0.1 by default][42948]
5737 - [Added a lot][42264] of [new error codes][42302]
5738 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
5739 libraries with C Run-time Libraries(CRT) to be statically linked.
5740 - [Fixed various ARM codegen bugs][42740]
5745 - [`String` now implements `FromIterator<Cow<'a, str>>` and
5746 `Extend<Cow<'a, str>>`][41449]
5747 - [`Vec` now implements `From<&mut [T]>`][41530]
5748 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
5749 - [`SplitWhitespace` now implements `Clone`][41659]
5750 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
5752 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
5753 macros, but for printing to stderr.
5758 - [`OsString::shrink_to_fit`]
5761 - [`thread::ThreadId`]
5766 - [Build scripts can now add environment variables to the environment
5767 the crate is being compiled in.
5768 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
5769 - [Subcommands now replace the current process rather than spawning a new
5770 child process][cargo/3970]
5771 - [Workspace members can now accept glob file patterns][cargo/3979]
5772 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
5773 the members in a given workspace.][cargo/3988]
5774 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
5775 - [Target directory path is now in the cargo metadata][cargo/4022]
5776 - [Cargo no longer checks out a local working directory for the
5777 crates.io index][cargo/4026] This should provide smaller file size for the
5778 registry, and improve cloning times, especially on Windows machines.
5779 - [Added an `--exclude` option for excluding certain packages when using the
5780 `--all` option][cargo/4031]
5781 - [Cargo will now automatically retry when receiving a 5xx error
5782 from crates.io][cargo/4032]
5783 - [The `--features` option now accepts multiple comma or space
5784 delimited values.][cargo/4084]
5785 - [Added support for custom target specific runners][cargo/3954]
5790 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
5792 - [Rust will now release XZ compressed packages][rust-installer/57]
5793 - [rustup will now prefer to download rust packages with
5794 XZ compression][rustup/1100] over GZip packages.
5795 - [Added the ability to escape `#` in rust documentation][41785] By adding
5796 additional `#`'s ie. `##` is now `#`
5801 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
5802 - [`-Z` flags are now no longer allowed to be used on the stable
5803 compiler.][41751] This has been a warning for a year previous to this.
5804 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
5805 longer works][42844]. Users should migrate to the built-in `check`
5806 command, which has been available since 1.16.
5807 - [Ending a float literal with `._` is now a hard error.
5808 Example: `42._` .][41946]
5809 - [Any use of a private `extern crate` outside of its module is now a
5810 hard error.][36886] This was previously a warning.
5811 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
5812 relative while the `::` prefix makes a path absolute, but was ignored and the
5813 path was relative regardless.
5814 - [Floating point constants in match patterns is now a hard error][36890]
5815 This was previously a warning.
5816 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
5817 match patterns is now a hard error][36891] This was previously a warning.
5818 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
5820 - [From the pound escape, lines consisting of multiple `#`s are
5822 - [It is an error to re-export private enum variants][42460]. This is
5823 known to break a number of crates that depend on an older version of
5825 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
5826 to use it to find the linker, and the build will fail where it did
5827 not previously][42607]
5829 [36886]: https://github.com/rust-lang/rust/issues/36886
5830 [36888]: https://github.com/rust-lang/rust/issues/36888
5831 [36890]: https://github.com/rust-lang/rust/issues/36890
5832 [36891]: https://github.com/rust-lang/rust/issues/36891
5833 [36892]: https://github.com/rust-lang/rust/issues/36892
5834 [37406]: https://github.com/rust-lang/rust/issues/37406
5835 [39983]: https://github.com/rust-lang/rust/pull/39983
5836 [41145]: https://github.com/rust-lang/rust/pull/41145
5837 [41192]: https://github.com/rust-lang/rust/pull/41192
5838 [41258]: https://github.com/rust-lang/rust/pull/41258
5839 [41370]: https://github.com/rust-lang/rust/pull/41370
5840 [41449]: https://github.com/rust-lang/rust/pull/41449
5841 [41530]: https://github.com/rust-lang/rust/pull/41530
5842 [41624]: https://github.com/rust-lang/rust/pull/41624
5843 [41656]: https://github.com/rust-lang/rust/pull/41656
5844 [41659]: https://github.com/rust-lang/rust/pull/41659
5845 [41676]: https://github.com/rust-lang/rust/pull/41676
5846 [41751]: https://github.com/rust-lang/rust/pull/41751
5847 [41764]: https://github.com/rust-lang/rust/pull/41764
5848 [41785]: https://github.com/rust-lang/rust/pull/41785
5849 [41873]: https://github.com/rust-lang/rust/pull/41873
5850 [41907]: https://github.com/rust-lang/rust/pull/41907
5851 [41946]: https://github.com/rust-lang/rust/pull/41946
5852 [42016]: https://github.com/rust-lang/rust/pull/42016
5853 [42037]: https://github.com/rust-lang/rust/pull/42037
5854 [42068]: https://github.com/rust-lang/rust/pull/42068
5855 [42150]: https://github.com/rust-lang/rust/pull/42150
5856 [42162]: https://github.com/rust-lang/rust/pull/42162
5857 [42225]: https://github.com/rust-lang/rust/pull/42225
5858 [42264]: https://github.com/rust-lang/rust/pull/42264
5859 [42302]: https://github.com/rust-lang/rust/pull/42302
5860 [42460]: https://github.com/rust-lang/rust/issues/42460
5861 [42607]: https://github.com/rust-lang/rust/issues/42607
5862 [42740]: https://github.com/rust-lang/rust/pull/42740
5863 [42844]: https://github.com/rust-lang/rust/issues/42844
5864 [42948]: https://github.com/rust-lang/rust/pull/42948
5865 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
5866 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
5867 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
5868 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
5869 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
5870 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
5871 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
5872 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
5873 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
5874 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
5875 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
5876 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
5877 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
5878 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
5879 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
5880 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
5881 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
5882 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
5883 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
5884 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
5885 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
5886 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
5889 Version 1.18.0 (2017-06-08)
5890 ===========================
5895 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
5896 make the item visible to just that module tree. Also accepts the keyword
5897 `crate` to make something public to the whole crate but not users of the
5898 library. Example: `pub(crate) mod utils;`. [RFC 1422].
5899 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
5900 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
5901 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
5902 types like `Write + Send`, trailing `+` are now supported in trait objects,
5903 and better error reporting for trait objects starting with `?Sized`.
5904 - [0e+10 is now a valid floating point literal][40589]
5905 - [Now warns if you bind a lifetime parameter to 'static][40734]
5906 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
5907 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
5908 representation in some cases.][40377]
5913 - [rustc can now emit mir with `--emit mir`][39891]
5914 - [Improved LLVM IR for trivial functions][40367]
5915 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
5916 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
5917 opportunities found through profiling
5918 - [Improved backtrace formatting when panicking][38165]
5923 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
5924 iterator hasn't been advanced the original `Vec` is reassembled with no actual
5925 iteration or reallocation.
5926 - [Simplified HashMap Bucket interface][40561] provides performance
5927 improvements for iterating and cloning.
5928 - [Specialize Vec::from_elem to use calloc][40409]
5929 - [Fixed Race condition in fs::create_dir_all][39799]
5930 - [No longer caching stdio on Windows][40516]
5931 - [Optimized insertion sort in slice][40807] insertion sort in some cases
5932 2.50%~ faster and in one case now 12.50% faster.
5933 - [Optimized `AtomicBool::fetch_nand`][41143]
5938 - [`Child::try_wait`]
5939 - [`HashMap::retain`]
5940 - [`HashSet::retain`]
5942 - [`TcpStream::peek`]
5943 - [`UdpSocket::peek`]
5944 - [`UdpSocket::peek_from`]
5949 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
5950 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
5951 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
5952 - [Added Android build support][cargo/3885]
5953 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
5954 of a certain type, for example `cargo build --bins` will build all
5956 - [Added support for haiku][cargo/3952]
5961 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
5962 - [Rust now uses the official cross compiler for NetBSD][40612]
5963 - [rustdoc now accepts `#` at the start of files][40828]
5964 - [Fixed jemalloc support for musl][41168]
5969 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
5970 always placed after the sign if it exists and before the digits. With the `#`
5971 flag the zeroes are placed after the prefix and before the digits.
5972 - [Due to the struct field optimisation][40377], using `transmute` on structs
5973 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
5974 always been undefined behavior, but is now more likely to break in practice.
5975 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
5976 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
5977 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
5978 - [Overlapping inherent `impl`s are now a hard error][40728]
5979 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
5980 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
5981 `out.asm` and `out.ll` instead of only one of the filetypes.
5982 - [ calling a function that returns `Self` will no longer work][41805] when
5983 the size of `Self` cannot be statically determined.
5984 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
5985 this has caused a few regressions namely:
5987 - Changed the link order of local static/dynamic libraries (respecting the
5988 order on given rather than having the compiler reorder).
5989 - Changed how MinGW is linked, native code linked to dynamic libraries
5990 may require manually linking to the gcc support library (for the native
5993 [38165]: https://github.com/rust-lang/rust/pull/38165
5994 [39799]: https://github.com/rust-lang/rust/pull/39799
5995 [39891]: https://github.com/rust-lang/rust/pull/39891
5996 [40043]: https://github.com/rust-lang/rust/pull/40043
5997 [40241]: https://github.com/rust-lang/rust/pull/40241
5998 [40338]: https://github.com/rust-lang/rust/pull/40338
5999 [40367]: https://github.com/rust-lang/rust/pull/40367
6000 [40377]: https://github.com/rust-lang/rust/pull/40377
6001 [40409]: https://github.com/rust-lang/rust/pull/40409
6002 [40516]: https://github.com/rust-lang/rust/pull/40516
6003 [40556]: https://github.com/rust-lang/rust/pull/40556
6004 [40561]: https://github.com/rust-lang/rust/pull/40561
6005 [40589]: https://github.com/rust-lang/rust/pull/40589
6006 [40612]: https://github.com/rust-lang/rust/pull/40612
6007 [40723]: https://github.com/rust-lang/rust/pull/40723
6008 [40728]: https://github.com/rust-lang/rust/pull/40728
6009 [40731]: https://github.com/rust-lang/rust/pull/40731
6010 [40734]: https://github.com/rust-lang/rust/pull/40734
6011 [40805]: https://github.com/rust-lang/rust/pull/40805
6012 [40807]: https://github.com/rust-lang/rust/pull/40807
6013 [40828]: https://github.com/rust-lang/rust/pull/40828
6014 [40870]: https://github.com/rust-lang/rust/pull/40870
6015 [41085]: https://github.com/rust-lang/rust/pull/41085
6016 [41143]: https://github.com/rust-lang/rust/pull/41143
6017 [41168]: https://github.com/rust-lang/rust/pull/41168
6018 [41270]: https://github.com/rust-lang/rust/issues/41270
6019 [41469]: https://github.com/rust-lang/rust/pull/41469
6020 [41805]: https://github.com/rust-lang/rust/issues/41805
6021 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
6022 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
6023 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
6024 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
6025 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
6026 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
6027 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
6028 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
6029 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
6030 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
6031 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
6032 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
6033 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
6034 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
6037 Version 1.17.0 (2017-04-27)
6038 ===========================
6043 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
6044 * [Fields of structs may be initialized without duplicating the field/variable
6045 names][39761]. [RFC 1682]
6046 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
6047 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6048 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
6049 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
6050 `'b`. Soundness fix.
6051 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
6052 * [Static variables may contain references to other statics][40027]
6057 * [Exit quickly on only `--emit dep-info`][40336]
6058 * [Make `-C relocation-model` more correctly determine whether the linker
6059 creates a position-independent executable][40245]
6060 * [Add `-C overflow-checks` to directly control whether integer overflow
6062 * [The rustc type checker now checks items on demand instead of in a single
6063 in-order pass][40008]. This is mostly an internal refactoring in support of
6064 future work, including incremental type checking, but also resolves [RFC
6065 1647], allowing `Self` to appear in `impl` `where` clauses.
6066 * [Optimize vtable loads][39995]
6067 * [Turn off vectorization for Emscripten targets][39990]
6068 * [Provide suggestions for unknown macros imported with `use`][39953]
6069 * [Fix ICEs in path resolution][39939]
6070 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
6071 * [Add clearer error message using `&str + &str`][39116]
6082 * [`Ordering::then`]
6083 * [`Ordering::then_with`]
6084 * [`BTreeMap::range`]
6085 * [`BTreeMap::range_mut`]
6086 * [`collections::Bound`]
6087 * [`process::abort`]
6088 * [`ptr::read_unaligned`]
6089 * [`ptr::write_unaligned`]
6090 * [`Result::expect_err`]
6093 * [`Cell::into_inner`]
6099 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
6100 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
6101 * [`String` implements `FromIterator<&char>`][40028]
6102 * `Box` [implements][40009] a number of new conversions:
6103 `From<Box<str>> for String`,
6104 `From<Box<[T]>> for Vec<T>`,
6105 `From<Box<CStr>> for CString`,
6106 `From<Box<OsStr>> for OsString`,
6107 `From<Box<Path>> for PathBuf`,
6108 `Into<Box<str>> for String`,
6109 `Into<Box<[T]>> for Vec<T>`,
6110 `Into<Box<CStr>> for CString`,
6111 `Into<Box<OsStr>> for OsString`,
6112 `Into<Box<Path>> for PathBuf`,
6113 `Default for Box<str>`,
6114 `Default for Box<CStr>`,
6115 `Default for Box<OsStr>`,
6116 `From<&CStr> for Box<CStr>`,
6117 `From<&OsStr> for Box<OsStr>`,
6118 `From<&Path> for Box<Path>`
6119 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
6120 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
6121 * [Slightly optimize `slice::sort`][39538]
6122 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
6123 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
6124 `Box<str>` implements `From<&str>`][39438]
6125 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
6126 `From<(I, u16)> where I: Into<IpAddr>`][39372]
6127 * [`format!` estimates the needed capacity before writing a string][39356]
6128 * [Support unprivileged symlink creation in Windows][38921]
6129 * [`PathBuf` implements `Default`][38764]
6130 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
6131 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
6132 and poor hash functions.
6137 * [Add `cargo check --all`][cargo/3731]
6138 * [Add an option to ignore SSL revocation checking][cargo/3699]
6139 * [Add `cargo run --package`][cargo/3691]
6140 * [Add `required_features`][cargo/3667]
6141 * [Assume `build.rs` is a build script][cargo/3664]
6142 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
6147 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
6149 * [The "Unstable Book" documents nightly-only features][ubook]
6150 * [Improve the style of the sidebar in rustdoc output][40265]
6151 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
6152 * [Fix MSP430 breakage due to `i128`][40257]
6153 * [Preliminary Solaris/SPARCv9 support][39903]
6154 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
6155 run without installing the MSVC runtime.
6156 * [`rustdoc --test` includes file names in test names][39788]
6157 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
6158 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
6159 * [Initial support for `aarch64-unknown-freebsd`][39491]
6160 * [Initial support for `i686-unknown-netbsd`][39426]
6161 * [This release no longer includes the old makefile build system][39431]. Rust
6162 is built with a custom build system, written in Rust, and with Cargo.
6163 * [Add Debug implementations for libcollection structs][39002]
6164 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
6165 * [`--test-threads=0` produces an error][38945]
6166 * [`rustup` installs documentation by default][40526]
6167 * [The Rust source includes NatVis visualizations][39843]. These can be used by
6168 WinDbg and Visual Studio to improve the debugging experience.
6173 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
6174 workaround, either use MSVC 2015 or run vcvars.bat.
6175 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
6176 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
6177 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
6179 * [`format!` and `Display::to_string` panic if an underlying formatting
6180 implementation returns an error][40117]. Previously the error was silently
6181 ignored. It is incorrect for `write_fmt` to return an error when writing
6183 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
6184 crates were marked stable and could be accessed from the stable toolchain.
6185 * [Rust git source no longer includes vendored crates][39728]. Those that need
6186 to build with vendored crates should build from release tarballs.
6187 * [Fix inert attributes from `proc_macro_derives`][39572]
6188 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
6189 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
6191 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
6192 existing code generally ignores the type of dead-code unless a type-hint is
6193 provided; this can cause surprising inference interactions particularly around
6194 defaulting. The new code uniformly ignores the result type of dead-code.
6195 * [Tuple-struct constructors with private fields are no longer visible][38932]
6196 * [Lifetime parameters that do not appear in the arguments are now considered
6197 early-bound][38897], resolving a soundness bug (#[32330]). The
6198 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
6200 * [rustdoc: fix doctests with non-feature crate attributes][38161]
6201 * [Make transmuting from fn item types to pointer-sized types a hard
6204 [27787]: https://github.com/rust-lang/rust/issues/27787
6205 [32330]: https://github.com/rust-lang/rust/issues/32330
6206 [34198]: https://github.com/rust-lang/rust/pull/34198
6207 [38161]: https://github.com/rust-lang/rust/pull/38161
6208 [38368]: https://github.com/rust-lang/rust/pull/38368
6209 [38584]: https://github.com/rust-lang/rust/issues/38584
6210 [38661]: https://github.com/rust-lang/rust/pull/38661
6211 [38764]: https://github.com/rust-lang/rust/pull/38764
6212 [38864]: https://github.com/rust-lang/rust/issues/38864
6213 [38897]: https://github.com/rust-lang/rust/pull/38897
6214 [38921]: https://github.com/rust-lang/rust/pull/38921
6215 [38932]: https://github.com/rust-lang/rust/pull/38932
6216 [38945]: https://github.com/rust-lang/rust/pull/38945
6217 [38981]: https://github.com/rust-lang/rust/pull/38981
6218 [39002]: https://github.com/rust-lang/rust/pull/39002
6219 [39116]: https://github.com/rust-lang/rust/pull/39116
6220 [39193]: https://github.com/rust-lang/rust/pull/39193
6221 [39265]: https://github.com/rust-lang/rust/pull/39265
6222 [39356]: https://github.com/rust-lang/rust/pull/39356
6223 [39372]: https://github.com/rust-lang/rust/pull/39372
6224 [39426]: https://github.com/rust-lang/rust/pull/39426
6225 [39431]: https://github.com/rust-lang/rust/pull/39431
6226 [39438]: https://github.com/rust-lang/rust/pull/39438
6227 [39440]: https://github.com/rust-lang/rust/pull/39440
6228 [39485]: https://github.com/rust-lang/rust/pull/39485
6229 [39491]: https://github.com/rust-lang/rust/pull/39491
6230 [39518]: https://github.com/rust-lang/rust/pull/39518
6231 [39538]: https://github.com/rust-lang/rust/pull/39538
6232 [39572]: https://github.com/rust-lang/rust/pull/39572
6233 [39633]: https://github.com/rust-lang/rust/pull/39633
6234 [39642]: https://github.com/rust-lang/rust/pull/39642
6235 [39728]: https://github.com/rust-lang/rust/pull/39728
6236 [39761]: https://github.com/rust-lang/rust/pull/39761
6237 [39788]: https://github.com/rust-lang/rust/pull/39788
6238 [39793]: https://github.com/rust-lang/rust/pull/39793
6239 [39837]: https://github.com/rust-lang/rust/pull/39837
6240 [39843]: https://github.com/rust-lang/rust/pull/39843
6241 [39851]: https://github.com/rust-lang/rust/pull/39851
6242 [39903]: https://github.com/rust-lang/rust/pull/39903
6243 [39939]: https://github.com/rust-lang/rust/pull/39939
6244 [39953]: https://github.com/rust-lang/rust/pull/39953
6245 [39960]: https://github.com/rust-lang/rust/pull/39960
6246 [39990]: https://github.com/rust-lang/rust/pull/39990
6247 [39995]: https://github.com/rust-lang/rust/pull/39995
6248 [40008]: https://github.com/rust-lang/rust/pull/40008
6249 [40009]: https://github.com/rust-lang/rust/pull/40009
6250 [40027]: https://github.com/rust-lang/rust/pull/40027
6251 [40028]: https://github.com/rust-lang/rust/pull/40028
6252 [40037]: https://github.com/rust-lang/rust/pull/40037
6253 [40117]: https://github.com/rust-lang/rust/pull/40117
6254 [40166]: https://github.com/rust-lang/rust/pull/40166
6255 [40245]: https://github.com/rust-lang/rust/pull/40245
6256 [40257]: https://github.com/rust-lang/rust/pull/40257
6257 [40261]: https://github.com/rust-lang/rust/pull/40261
6258 [40265]: https://github.com/rust-lang/rust/pull/40265
6259 [40319]: https://github.com/rust-lang/rust/pull/40319
6260 [40336]: https://github.com/rust-lang/rust/pull/40336
6261 [40526]: https://github.com/rust-lang/rust/pull/40526
6262 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
6263 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
6264 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
6265 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
6266 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
6267 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
6268 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
6269 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
6270 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
6271 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
6272 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
6273 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
6274 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
6275 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
6276 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
6277 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
6278 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
6279 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
6280 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
6281 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
6282 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
6283 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
6284 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
6285 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
6286 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
6287 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
6288 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
6289 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
6290 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
6291 [ubook]: https://doc.rust-lang.org/unstable-book/
6294 Version 1.16.0 (2017-03-16)
6295 ===========================
6300 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6301 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6302 match patterns][38069]
6303 * [Clean up semantics of `self` in an import list][38313]
6304 * [`Self` may appear in `impl` headers][38920]
6305 * [`Self` may appear in struct expressions][39282]
6310 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
6311 a `.rmeta` file containing only crate metadata][38571]. This can be
6312 used by tools like the Rust Language Service to perform
6313 metadata-only builds.
6314 * [Levenshtein based typo suggestions now work in most places, while
6315 previously they worked only for fields and sometimes for local
6316 variables][38927]. Together with the overhaul of "no
6317 resolution"/"unexpected resolution" errors (#[38154]) they result in
6318 large and systematic improvement in resolution diagnostics.
6319 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
6321 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
6322 * [`rustc` no longer attempts to provide "consider using an explicit
6323 lifetime" suggestions][37057]. They were inaccurate.
6328 * [`VecDeque::truncate`]
6329 * [`VecDeque::resize`]
6330 * [`String::insert_str`]
6331 * [`Duration::checked_add`]
6332 * [`Duration::checked_sub`]
6333 * [`Duration::checked_div`]
6334 * [`Duration::checked_mul`]
6337 * [`SocketAddr::is_ipv4`]
6338 * [`SocketAddr::is_ipv6`]
6339 * [`IpAddr::is_ipv4`]
6340 * [`IpAddr::is_ipv6`]
6342 * [`Vec::dedup_by_key`]
6343 * [`Result::unwrap_or_default`]
6344 * [`<*const T>::wrapping_offset`]
6345 * [`<*mut T>::wrapping_offset`]
6346 * `CommandExt::creation_flags`
6347 * [`File::set_permissions`]
6348 * [`String::split_off`]
6353 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
6354 their argument by `Borrow` parameter][37761]
6355 * [All public types in std implement `Debug`][38006]
6356 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
6357 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
6358 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6360 * [std: Fix partial writes in `LineWriter`][38062]
6361 * [std: Clamp max read/write sizes on Unix][38622]
6362 * [Use more specific panic message for `&str` slicing errors][38066]
6363 * [`TcpListener::set_only_v6` is deprecated][38304]. This
6364 functionality cannot be achieved in std currently.
6365 * [`writeln!`, like `println!`, now accepts a form with no string
6366 or formatting arguments, to just print a newline][38469]
6367 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
6368 * [Reduce the size of static data in `std_unicode::tables`][38781]
6369 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
6370 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
6372 * [`Duration` implements `Sum`][38712]
6373 * [`String` implements `ToSocketAddrs`][39048]
6378 * [The `cargo check` command does a type check of a project without
6379 building it][cargo/3296]
6380 * [crates.io will display CI badges from Travis and AppVeyor, if
6381 specified in Cargo.toml][cargo/3546]
6382 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
6383 * [Compilation profiles accept integer values for `debug`, in addition
6384 to `true` and `false`. These are passed to `rustc` as the value to
6385 `-C debuginfo`][cargo/3534]
6386 * [Implement `cargo --version --verbose`][cargo/3604]
6387 * [All builds now output 'dep-info' build dependencies compatible with
6388 make and ninja][cargo/3557]
6389 * [Build all workspace members with `build --all`][cargo/3511]
6390 * [Document all workspace members with `doc --all`][cargo/3515]
6391 * [Path deps outside workspace are not members][cargo/3443]
6396 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
6397 the path to the Rust implementation][38589]
6398 * [The `armv7-linux-androideabi` target no longer enables NEON
6399 extensions, per Google's ABI guide][38413]
6400 * [The stock standard library can be compiled for Redox OS][38401]
6401 * [Rust has initial SPARC support][38726]. Tier 3. No builds
6403 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
6405 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
6410 * [Uninhabitable enums (those without any variants) no longer permit wildcard
6411 match patterns][38069]
6412 * In this release, references to uninhabited types can not be
6413 pattern-matched. This was accidentally allowed in 1.15.
6414 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
6415 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
6417 * [Clean up semantics of `self` in an import list][38313]
6418 * Reimplemented lifetime elision. This change was almost entirely compatible
6419 with existing code, but it did close a number of small bugs and loopholes,
6420 as well as being more accepting in some other [cases][41105].
6422 [37057]: https://github.com/rust-lang/rust/pull/37057
6423 [37761]: https://github.com/rust-lang/rust/pull/37761
6424 [38006]: https://github.com/rust-lang/rust/pull/38006
6425 [38051]: https://github.com/rust-lang/rust/pull/38051
6426 [38062]: https://github.com/rust-lang/rust/pull/38062
6427 [38622]: https://github.com/rust-lang/rust/pull/38622
6428 [38066]: https://github.com/rust-lang/rust/pull/38066
6429 [38069]: https://github.com/rust-lang/rust/pull/38069
6430 [38131]: https://github.com/rust-lang/rust/pull/38131
6431 [38154]: https://github.com/rust-lang/rust/pull/38154
6432 [38274]: https://github.com/rust-lang/rust/pull/38274
6433 [38304]: https://github.com/rust-lang/rust/pull/38304
6434 [38313]: https://github.com/rust-lang/rust/pull/38313
6435 [38327]: https://github.com/rust-lang/rust/pull/38327
6436 [38401]: https://github.com/rust-lang/rust/pull/38401
6437 [38413]: https://github.com/rust-lang/rust/pull/38413
6438 [38469]: https://github.com/rust-lang/rust/pull/38469
6439 [38559]: https://github.com/rust-lang/rust/pull/38559
6440 [38571]: https://github.com/rust-lang/rust/pull/38571
6441 [38580]: https://github.com/rust-lang/rust/pull/38580
6442 [38589]: https://github.com/rust-lang/rust/pull/38589
6443 [38670]: https://github.com/rust-lang/rust/pull/38670
6444 [38712]: https://github.com/rust-lang/rust/pull/38712
6445 [38726]: https://github.com/rust-lang/rust/pull/38726
6446 [38781]: https://github.com/rust-lang/rust/pull/38781
6447 [38798]: https://github.com/rust-lang/rust/pull/38798
6448 [38909]: https://github.com/rust-lang/rust/pull/38909
6449 [38920]: https://github.com/rust-lang/rust/pull/38920
6450 [38927]: https://github.com/rust-lang/rust/pull/38927
6451 [39048]: https://github.com/rust-lang/rust/pull/39048
6452 [39282]: https://github.com/rust-lang/rust/pull/39282
6453 [39379]: https://github.com/rust-lang/rust/pull/39379
6454 [41105]: https://github.com/rust-lang/rust/issues/41105
6455 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6456 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
6457 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
6458 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
6459 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
6460 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
6461 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
6462 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
6463 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
6464 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
6465 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
6466 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
6467 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
6468 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
6469 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
6470 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
6471 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
6472 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
6473 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
6474 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
6475 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
6476 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
6477 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
6478 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
6479 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
6480 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
6481 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
6482 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
6483 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
6486 Version 1.15.1 (2017-02-09)
6487 ===========================
6489 * [Fix IntoIter::as_mut_slice's signature][39466]
6490 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
6492 [39466]: https://github.com/rust-lang/rust/pull/39466
6493 [39523]: https://github.com/rust-lang/rust/pull/39523
6496 Version 1.15.0 (2017-02-02)
6497 ===========================
6502 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
6503 stable. This allows popular code-generating crates like Serde and Diesel to
6504 work ergonomically. [RFC 1681].
6505 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
6506 with curly braces][36868]. Part of [RFC 1506].
6507 * [A number of minor changes to name resolution have been activated][37127].
6508 They add up to more consistent semantics, allowing for future evolution of
6509 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6510 details of what is different. The breaking changes here have been transitioned
6511 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6512 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
6514 * [`?Sized` can be used in `where` clauses][37791]
6515 * [There is now a limit on the size of monomorphized types and it can be
6516 modified with the `#![type_size_limit]` crate attribute, similarly to
6517 the `#![recursion_limit]` attribute][37789]
6522 * [On Windows, the compiler will apply dllimport attributes when linking to
6523 extern functions][37973]. Additional attributes and flags can control which
6524 library kind is linked and its name. [RFC 1717].
6525 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6526 * [The `--test` flag works with procedural macro crates][38107]
6527 * [Fix `extern "aapcs" fn` ABI][37814]
6528 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
6529 * [The `format!` expander recognizes incorrect `printf` and shell-style
6530 formatting directives and suggests the correct format][37613].
6531 * [Only report one error for all unused imports in an import list][37456]
6533 Compiler Performance
6534 --------------------
6536 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
6537 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
6538 * [Don't clone in `UnificationTable::probe`][37848]
6539 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
6540 * [Use small vectors in type walker][37760]
6541 * [Macro expansion performance was improved][37701]
6542 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
6543 * [Replace FNV with a faster hash function][37229]
6548 * [`std::iter::Iterator::min_by`]
6549 * [`std::iter::Iterator::max_by`]
6550 * [`std::os::*::fs::FileExt`]
6551 * [`std::sync::atomic::Atomic*::get_mut`]
6552 * [`std::sync::atomic::Atomic*::into_inner`]
6553 * [`std::vec::IntoIter::as_slice`]
6554 * [`std::vec::IntoIter::as_mut_slice`]
6555 * [`std::sync::mpsc::Receiver::try_iter`]
6556 * [`std::os::unix::process::CommandExt::before_exec`]
6557 * [`std::rc::Rc::strong_count`]
6558 * [`std::rc::Rc::weak_count`]
6559 * [`std::sync::Arc::strong_count`]
6560 * [`std::sync::Arc::weak_count`]
6561 * [`std::char::encode_utf8`]
6562 * [`std::char::encode_utf16`]
6563 * [`std::cell::Ref::clone`]
6564 * [`std::io::Take::into_inner`]
6569 * [The standard sorting algorithm has been rewritten for dramatic performance
6570 improvements][38192]. It is a hybrid merge sort, drawing influences from
6571 Timsort. Previously it was a naive merge sort.
6572 * [`Iterator::nth` no longer has a `Sized` bound][38134]
6573 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
6575 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
6576 and `char_indices().last()`][37882]
6577 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
6578 * [Chinese characters display correctly in `fmt::Debug`][37855]
6579 * [Derive `Default` for `Duration`][37699]
6580 * [Support creation of anonymous pipes on WinXP/2k][37677]
6581 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
6582 * [Don't pass overlapped handles to processes][38835]
6587 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6588 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6589 should instead check the variable at runtime with `std::env`. That the value
6590 was set at build time was a bug, and incorrect when cross-compiling. This
6591 change is known to cause breakage.
6592 * [Add `--all` flag to `cargo test`][cargo/3221]
6593 * [Compile statically against the MSVC CRT][cargo/3363]
6594 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
6595 * [Link OpenSSL statically on OSX][cargo/3311]
6596 * [Apply new fingerprinting to build dir outputs][cargo/3310]
6597 * [Test for bad path overrides with summaries][cargo/3336]
6598 * [Require `cargo install --vers` to take a semver version][cargo/3338]
6599 * [Fix retrying crate downloads for network errors][cargo/3348]
6600 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
6601 * [Emit more info on --message-format=json][cargo/3319]
6602 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
6603 * [Don't ignore errors in workspace manifest][cargo/3409]
6604 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
6609 * [Test runners (binaries built with `--test`) now support a `--list` argument
6610 that lists the tests it contains][38185]
6611 * [Test runners now support a `--exact` argument that makes the test filter
6612 match exactly, instead of matching only a substring of the test name][38181]
6613 * [rustdoc supports a `--playground-url` flag][37763]
6614 * [rustdoc provides more details about `#[should_panic]` errors][37749]
6619 * [The Rust build system is now written in Rust][37817]. The Makefiles may
6620 continue to be used in this release by passing `--disable-rustbuild` to the
6621 configure script, but they will be deleted soon. Note that the new build
6622 system uses a different on-disk layout that will likely affect any scripts
6624 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
6626 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
6627 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
6633 * [A number of minor changes to name resolution have been activated][37127].
6634 They add up to more consistent semantics, allowing for future evolution of
6635 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
6636 details of what is different. The breaking changes here have been transitioned
6637 through the [`legacy_imports`] lint since 1.14, with no known regressions.
6638 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
6639 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
6640 should instead check the variable at runtime with `std::env`. That the value
6641 was set at build time was a bug, and incorrect when cross-compiling. This
6642 change is known to cause breakage.
6643 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
6644 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
6645 1.10 and is now an error by default. It will become a hard error in the near
6647 * [The semantics relating modules to file system directories are changing in
6648 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
6649 lint, which is a warning in this release, and will become a hard error in the
6651 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
6652 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
6653 the underlying iterator][37834]
6655 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
6656 [33685]: https://github.com/rust-lang/rust/issues/33685
6657 [36868]: https://github.com/rust-lang/rust/pull/36868
6658 [37127]: https://github.com/rust-lang/rust/pull/37127
6659 [37229]: https://github.com/rust-lang/rust/pull/37229
6660 [37456]: https://github.com/rust-lang/rust/pull/37456
6661 [37527]: https://github.com/rust-lang/rust/pull/37527
6662 [37602]: https://github.com/rust-lang/rust/pull/37602
6663 [37613]: https://github.com/rust-lang/rust/pull/37613
6664 [37615]: https://github.com/rust-lang/rust/pull/37615
6665 [37636]: https://github.com/rust-lang/rust/pull/37636
6666 [37627]: https://github.com/rust-lang/rust/pull/37627
6667 [37642]: https://github.com/rust-lang/rust/pull/37642
6668 [37677]: https://github.com/rust-lang/rust/pull/37677
6669 [37699]: https://github.com/rust-lang/rust/pull/37699
6670 [37701]: https://github.com/rust-lang/rust/pull/37701
6671 [37705]: https://github.com/rust-lang/rust/pull/37705
6672 [37749]: https://github.com/rust-lang/rust/pull/37749
6673 [37760]: https://github.com/rust-lang/rust/pull/37760
6674 [37763]: https://github.com/rust-lang/rust/pull/37763
6675 [37764]: https://github.com/rust-lang/rust/pull/37764
6676 [37789]: https://github.com/rust-lang/rust/pull/37789
6677 [37791]: https://github.com/rust-lang/rust/pull/37791
6678 [37814]: https://github.com/rust-lang/rust/pull/37814
6679 [37817]: https://github.com/rust-lang/rust/pull/37817
6680 [37834]: https://github.com/rust-lang/rust/pull/37834
6681 [37848]: https://github.com/rust-lang/rust/pull/37848
6682 [37855]: https://github.com/rust-lang/rust/pull/37855
6683 [37882]: https://github.com/rust-lang/rust/pull/37882
6684 [37888]: https://github.com/rust-lang/rust/pull/37888
6685 [37973]: https://github.com/rust-lang/rust/pull/37973
6686 [37979]: https://github.com/rust-lang/rust/pull/37979
6687 [38086]: https://github.com/rust-lang/rust/pull/38086
6688 [38107]: https://github.com/rust-lang/rust/pull/38107
6689 [38117]: https://github.com/rust-lang/rust/pull/38117
6690 [38134]: https://github.com/rust-lang/rust/pull/38134
6691 [38146]: https://github.com/rust-lang/rust/pull/38146
6692 [38181]: https://github.com/rust-lang/rust/pull/38181
6693 [38182]: https://github.com/rust-lang/rust/pull/38182
6694 [38185]: https://github.com/rust-lang/rust/pull/38185
6695 [38192]: https://github.com/rust-lang/rust/pull/38192
6696 [38279]: https://github.com/rust-lang/rust/pull/38279
6697 [38835]: https://github.com/rust-lang/rust/pull/38835
6698 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
6699 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
6700 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
6701 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
6702 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
6703 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
6704 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
6705 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
6706 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
6707 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
6708 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
6709 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
6710 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
6711 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
6712 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
6713 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
6714 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
6715 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
6716 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
6717 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
6718 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
6719 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
6720 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
6721 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
6722 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
6723 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
6724 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
6725 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
6726 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
6727 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
6728 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
6729 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
6730 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
6731 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
6732 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
6733 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
6734 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
6737 Version 1.14.0 (2016-12-22)
6738 ===========================
6743 * [`..` matches multiple tuple fields in enum variants, structs
6744 and tuples][36843]. [RFC 1492].
6745 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
6746 * [`use *` and `use ::*` both glob-import from the crate root][37367]
6747 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
6748 dereferencing][36822]
6753 * [Mark enums with non-zero discriminant as non-zero][37224]
6754 * [Lower-case `static mut` names are linted like other
6755 statics and consts][37162]
6756 * [Fix ICE on some macros in const integer positions
6757 (e.g. `[u8; m!()]`)][36819]
6758 * [Improve error message and snippet for "did you mean `x`"][36798]
6759 * [Add a panic-strategy field to the target specification][36794]
6760 * [Include LLVM version in `--version --verbose`][37200]
6762 Compile-time Optimizations
6763 --------------------------
6765 * [Improve macro expansion performance][37569]
6766 * [Shrink `Expr_::ExprInlineAsm`][37445]
6767 * [Replace all uses of SHA-256 with BLAKE2b][37439]
6768 * [Reduce the number of bytes hashed by `IchHasher`][37427]
6769 * [Avoid more allocations when compiling html5ever][37373]
6770 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
6771 * [Avoid some allocations in the macro parser][37318]
6772 * [Use a faster deflate setting][37298]
6773 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
6774 during interning of slices][37270]
6775 * [Optimize `write_metadata`][37267]
6776 * [Don't process obligation forest cycles when stalled][37231]
6777 * [Avoid many `CrateConfig` clones][37161]
6778 * [Optimize `Substs::super_fold_with`][37108]
6779 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
6780 * [Speed up `plug_leaks`][36917]
6785 * [`println!()`, with no arguments, prints newline][36825].
6786 Previously, an empty string was required to achieve the same.
6787 * [`Wrapping` impls standard binary and unary operators, as well as
6788 the `Sum` and `Product` iterators][37356]
6789 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
6791 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
6792 `VecDeque` iterators][37315]
6793 * [Improve `SipHasher` performance on small values][37312]
6794 * [Add Iterator trait TrustedLen to enable better FromIterator /
6796 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
6797 * [`ReadDir` implements `Debug`][37221]
6798 * [Implement `RefUnwindSafe` for atomic types][37178]
6799 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
6800 * [Avoid allocations in `Decoder::read_str`][37064]
6801 * [`io::Error` implements `From<io::ErrorKind>`][37037]
6802 * [Impl `Debug` for raw pointers to unsized data][36880]
6803 * [Don't reuse `HashMap` random seeds][37470]
6804 * [The internal memory layout of `HashMap` is more cache-friendly, for
6805 significant improvements in some operations][36692]
6806 * [`HashMap` uses less memory on 32-bit architectures][36595]
6807 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
6812 * [Expose rustc cfg values to build scripts][cargo/3243]
6813 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
6814 * [Fix passing --features when testing multiple packages][cargo/3280]
6815 * [Use a single profile set per workspace][cargo/3249]
6816 * [Load `replace` sections from lock files][cargo/3220]
6817 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
6822 * [rustup is the recommended Rust installation method][1.14rustup]
6823 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
6824 S390x. These are [tier 2] platforms and may have major defects. Follow the
6825 instructions on the website to install, or add the targets to an existing
6826 installation with `rustup target add`. The new target triples are:
6827 - `mips-unknown-linux-gnu`
6828 - `mipsel-unknown-linux-gnu`
6829 - `mips64-unknown-linux-gnuabi64`
6830 - `mips64el-unknown-linux-gnuabi64 `
6831 - `powerpc-unknown-linux-gnu`
6832 - `powerpc64-unknown-linux-gnu`
6833 - `powerpc64le-unknown-linux-gnu`
6834 - `s390x-unknown-linux-gnu `
6835 * This release includes target (std) builds for ARM Linux running MUSL
6836 libc. These are [tier 2] platforms and may have major defects. Add the
6837 following triples to an existing rustup installation with `rustup target add`:
6838 - `arm-unknown-linux-musleabi`
6839 - `arm-unknown-linux-musleabihf`
6840 - `armv7-unknown-linux-musleabihf`
6841 * This release includes [experimental support for WebAssembly][1.14wasm], via
6842 the `wasm32-unknown-emscripten` target. This target is known to have major
6843 defects. Please test, report, and fix.
6844 * rustup no longer installs documentation by default. Run `rustup
6845 component add rust-docs` to install.
6846 * [Fix line stepping in debugger][37310]
6847 * [Enable line number debuginfo in releases][37280]
6852 * [Disable jemalloc on aarch64/powerpc/mips][37392]
6853 * [Add support for Fuchsia OS][37313]
6854 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
6859 * [A number of forward-compatibility lints used by the compiler
6860 to gradually introduce language changes have been converted
6861 to deny by default][36894]:
6862 - ["use of inaccessible extern crate erroneously allowed"][36886]
6863 - ["type parameter default erroneously allowed in invalid location"][36887]
6864 - ["detects super or self keywords at the beginning of global path"][36888]
6865 - ["two overlapping inherent impls define an item with the same name
6866 were erroneously allowed"][36889]
6867 - ["floating-point constants cannot be used in patterns"][36890]
6868 - ["constants of struct or enum type can only be used in a pattern if
6869 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
6870 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
6871 * [Prohibit patterns in trait methods without bodies][37378]
6872 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
6873 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
6874 * [The `$crate` macro variable is accepted in fewer locations][37213]
6875 * [Impls specifying extra region requirements beyond the trait
6876 they implement are rejected][37167]
6877 * [Enums may not be unsized][37111]. Unsized enums are intended to
6878 work but never have. For now they are forbidden.
6879 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
6881 [tier 2]: https://forge.rust-lang.org/platform-support.html
6882 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
6883 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
6884 [36430]: https://github.com/rust-lang/rust/pull/36430
6885 [36595]: https://github.com/rust-lang/rust/pull/36595
6886 [36692]: https://github.com/rust-lang/rust/pull/36692
6887 [36767]: https://github.com/rust-lang/rust/pull/36767
6888 [36794]: https://github.com/rust-lang/rust/pull/36794
6889 [36798]: https://github.com/rust-lang/rust/pull/36798
6890 [36819]: https://github.com/rust-lang/rust/pull/36819
6891 [36822]: https://github.com/rust-lang/rust/pull/36822
6892 [36825]: https://github.com/rust-lang/rust/pull/36825
6893 [36843]: https://github.com/rust-lang/rust/pull/36843
6894 [36880]: https://github.com/rust-lang/rust/pull/36880
6895 [36886]: https://github.com/rust-lang/rust/issues/36886
6896 [36887]: https://github.com/rust-lang/rust/issues/36887
6897 [36888]: https://github.com/rust-lang/rust/issues/36888
6898 [36889]: https://github.com/rust-lang/rust/issues/36889
6899 [36890]: https://github.com/rust-lang/rust/issues/36890
6900 [36891]: https://github.com/rust-lang/rust/issues/36891
6901 [36892]: https://github.com/rust-lang/rust/issues/36892
6902 [36894]: https://github.com/rust-lang/rust/pull/36894
6903 [36917]: https://github.com/rust-lang/rust/pull/36917
6904 [36993]: https://github.com/rust-lang/rust/pull/36993
6905 [37037]: https://github.com/rust-lang/rust/pull/37037
6906 [37064]: https://github.com/rust-lang/rust/pull/37064
6907 [37094]: https://github.com/rust-lang/rust/pull/37094
6908 [37108]: https://github.com/rust-lang/rust/pull/37108
6909 [37111]: https://github.com/rust-lang/rust/pull/37111
6910 [37161]: https://github.com/rust-lang/rust/pull/37161
6911 [37162]: https://github.com/rust-lang/rust/pull/37162
6912 [37167]: https://github.com/rust-lang/rust/pull/37167
6913 [37178]: https://github.com/rust-lang/rust/pull/37178
6914 [37200]: https://github.com/rust-lang/rust/pull/37200
6915 [37213]: https://github.com/rust-lang/rust/pull/37213
6916 [37221]: https://github.com/rust-lang/rust/pull/37221
6917 [37224]: https://github.com/rust-lang/rust/pull/37224
6918 [37230]: https://github.com/rust-lang/rust/pull/37230
6919 [37231]: https://github.com/rust-lang/rust/pull/37231
6920 [37247]: https://github.com/rust-lang/rust/pull/37247
6921 [37267]: https://github.com/rust-lang/rust/pull/37267
6922 [37270]: https://github.com/rust-lang/rust/pull/37270
6923 [37273]: https://github.com/rust-lang/rust/pull/37273
6924 [37280]: https://github.com/rust-lang/rust/pull/37280
6925 [37298]: https://github.com/rust-lang/rust/pull/37298
6926 [37306]: https://github.com/rust-lang/rust/pull/37306
6927 [37310]: https://github.com/rust-lang/rust/pull/37310
6928 [37312]: https://github.com/rust-lang/rust/pull/37312
6929 [37313]: https://github.com/rust-lang/rust/pull/37313
6930 [37315]: https://github.com/rust-lang/rust/pull/37315
6931 [37318]: https://github.com/rust-lang/rust/pull/37318
6932 [37322]: https://github.com/rust-lang/rust/pull/37322
6933 [37326]: https://github.com/rust-lang/rust/pull/37326
6934 [37351]: https://github.com/rust-lang/rust/pull/37351
6935 [37356]: https://github.com/rust-lang/rust/pull/37356
6936 [37367]: https://github.com/rust-lang/rust/pull/37367
6937 [37373]: https://github.com/rust-lang/rust/pull/37373
6938 [37378]: https://github.com/rust-lang/rust/pull/37378
6939 [37389]: https://github.com/rust-lang/rust/pull/37389
6940 [37392]: https://github.com/rust-lang/rust/pull/37392
6941 [37427]: https://github.com/rust-lang/rust/pull/37427
6942 [37439]: https://github.com/rust-lang/rust/pull/37439
6943 [37445]: https://github.com/rust-lang/rust/pull/37445
6944 [37470]: https://github.com/rust-lang/rust/pull/37470
6945 [37569]: https://github.com/rust-lang/rust/pull/37569
6946 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
6947 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
6948 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
6949 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
6950 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
6951 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
6952 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
6955 Version 1.13.0 (2016-11-10)
6956 ===========================
6961 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
6962 errors, like the `try!` macro, described in [RFC 0243].
6963 * [Stabilize macros in type position][36014]. Described in [RFC 873].
6964 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
6965 * [Fix `#[derive]` for empty tuple structs/variants][35728]
6966 * [Fix lifetime rules for 'if' conditions][36029]
6967 * [Avoid loading and parsing unconfigured non-inline modules][36482]
6972 * [Add the `-C link-arg` argument][36574]
6973 * [Remove the old AST-based backend from rustc_trans][35764]
6974 * [Don't enable NEON by default on armv7 Linux][35814]
6975 * [Fix debug line number info for macro expansions][35238]
6976 * [Do not emit "class method" debuginfo for types that are not
6977 DICompositeType][36008]
6978 * [Warn about multiple conflicting #[repr] hints][34623]
6979 * [When sizing DST, don't double-count nested struct prefixes][36351]
6980 * [Default RUST_MIN_STACK to 16MiB for now][36505]
6981 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
6982 * [Reject macros with empty repetitions to avoid infinite loop][36721]
6983 * [Expand macros without recursing to avoid stack overflows][36214]
6988 * [Replace macro backtraces with labeled local uses][35702]
6989 * [Improve error message for misplaced doc comments][33922]
6990 * [Buffer unix and lock windows to prevent message interleaving][35975]
6991 * [Update lifetime errors to specifically note temporaries][36171]
6992 * [Special case a few colors for Windows][36178]
6993 * [Suggest `use self` when such an import resolves][36289]
6994 * [Be more specific when type parameter shadows primitive type][36338]
6995 * Many minor improvements
6997 Compile-time Optimizations
6998 --------------------------
7000 * [Compute and cache HIR hashes at beginning][35854]
7001 * [Don't hash types in loan paths][36004]
7002 * [Cache projections in trans][35761]
7003 * [Optimize the parser's last token handling][36527]
7004 * [Only instantiate #[inline] functions in codegen units referencing
7005 them][36524]. This leads to big improvements in cases where crates export
7006 define many inline functions without using them directly.
7007 * [Lazily allocate TypedArena's first chunk][36592]
7008 * [Don't allocate during default HashSet creation][36734]
7015 * [`overflowing_abs`]
7016 * [`RefCell::try_borrow`]
7017 * [`RefCell::try_borrow_mut`]
7022 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
7023 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
7025 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
7026 * [Implement `Debug` for `std::vec::IntoIter`][35707]
7027 * [`CString`: avoid excessive growth just to 0-terminate][35871]
7028 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
7029 * [Use arc4rand on FreeBSD][35884]
7030 * [memrchr: Correct aligned offset computation][35969]
7031 * [Improve Demangling of Rust Symbols][36059]
7032 * [Use monotonic time in condition variables][35048]
7033 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
7034 * [Implement conversion traits for `char`][35755]
7035 * [Fix illegal instruction caused by overflow in channel cloning][36104]
7036 * [Zero first byte of CString on drop][36264]
7037 * [Inherit overflow checks for sum and product][36372]
7038 * [Add missing Eq implementations][36423]
7039 * [Implement `Debug` for `DirEntry`][36631]
7040 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
7042 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7043 * [Implement more traits for `std::io::ErrorKind`][35911]
7044 * [Optimize BinaryHeap bounds checking][36072]
7045 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
7046 `extend_with_element`][36355]
7047 * [Fix overflow checking in unsigned pow()][34942]
7052 * This release includes security fixes to both curl and OpenSSL.
7053 * [Fix transitive doctests when panic=abort][cargo/3021]
7054 * [Add --all-features flag to cargo][cargo/3038]
7055 * [Reject path-based dependencies in `cargo package`][cargo/3060]
7056 * [Don't parse the home directory more than once][cargo/3078]
7057 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
7058 * [Update OpenSSL to 1.0.2j][cargo/3121]
7059 * [Add license and license_file to cargo metadata output][cargo/3110]
7060 * [Make crates-io registry URL optional in config; ignore all changes to
7061 source.crates-io][cargo/3089]
7062 * [Don't download dependencies from other platforms][cargo/3123]
7063 * [Build transitive dev-dependencies when needed][cargo/3125]
7064 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
7065 * [Avoid updating registry when adding existing deps][cargo/3144]
7066 * [Warn about path overrides that won't work][cargo/3136]
7067 * [Use workspaces during `cargo install`][cargo/3146]
7068 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
7069 * [Add --message-format flag][cargo/3000]
7070 * [Pass target environment for rustdoc][cargo/3205]
7071 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
7072 * [Update curl and curl-sys][cargo/3241]
7073 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
7078 * [rustdoc: Add the `--sysroot` argument][36586]
7079 * [rustdoc: Fix a couple of issues with the search results][35655]
7080 * [rustdoc: remove the `!` from macro URLs and titles][35234]
7081 * [gdb: Fix pretty-printing special-cased Rust types][35585]
7082 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
7087 * [Remove unmaintained style guide][35124]
7088 * [Add s390x support][36369]
7089 * [Initial work at Haiku OS support][36727]
7090 * [Add mips-uclibc targets][35734]
7091 * [Crate-ify compiler-rt into compiler-builtins][35021]
7092 * [Add rustc version info (git hash + date) to dist tarball][36213]
7093 * Many documentation improvements
7098 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
7099 * [Deny (by default) transmuting from fn item types to pointer-sized
7100 types][34923]. Continuing the long transition to zero-sized fn items,
7102 * [Fix `#[derive]` for empty tuple structs/variants][35728].
7104 * [Issue deprecation warnings for safe accesses to extern statics][36173]
7105 * [Fix lifetime rules for 'if' conditions][36029].
7106 * [Inherit overflow checks for sum and product][36372].
7107 * [Forbid user-defined macros named "macro_rules"][36730].
7109 [33922]: https://github.com/rust-lang/rust/pull/33922
7110 [34623]: https://github.com/rust-lang/rust/pull/34623
7111 [34923]: https://github.com/rust-lang/rust/pull/34923
7112 [34942]: https://github.com/rust-lang/rust/pull/34942
7113 [35021]: https://github.com/rust-lang/rust/pull/35021
7114 [35048]: https://github.com/rust-lang/rust/pull/35048
7115 [35074]: https://github.com/rust-lang/rust/pull/35074
7116 [35124]: https://github.com/rust-lang/rust/pull/35124
7117 [35234]: https://github.com/rust-lang/rust/pull/35234
7118 [35238]: https://github.com/rust-lang/rust/pull/35238
7119 [35354]: https://github.com/rust-lang/rust/pull/35354
7120 [35559]: https://github.com/rust-lang/rust/pull/35559
7121 [35585]: https://github.com/rust-lang/rust/pull/35585
7122 [35627]: https://github.com/rust-lang/rust/pull/35627
7123 [35655]: https://github.com/rust-lang/rust/pull/35655
7124 [35702]: https://github.com/rust-lang/rust/pull/35702
7125 [35707]: https://github.com/rust-lang/rust/pull/35707
7126 [35728]: https://github.com/rust-lang/rust/pull/35728
7127 [35734]: https://github.com/rust-lang/rust/pull/35734
7128 [35755]: https://github.com/rust-lang/rust/pull/35755
7129 [35761]: https://github.com/rust-lang/rust/pull/35761
7130 [35764]: https://github.com/rust-lang/rust/pull/35764
7131 [35814]: https://github.com/rust-lang/rust/pull/35814
7132 [35854]: https://github.com/rust-lang/rust/pull/35854
7133 [35871]: https://github.com/rust-lang/rust/pull/35871
7134 [35884]: https://github.com/rust-lang/rust/pull/35884
7135 [35911]: https://github.com/rust-lang/rust/pull/35911
7136 [35969]: https://github.com/rust-lang/rust/pull/35969
7137 [35975]: https://github.com/rust-lang/rust/pull/35975
7138 [36004]: https://github.com/rust-lang/rust/pull/36004
7139 [36008]: https://github.com/rust-lang/rust/pull/36008
7140 [36014]: https://github.com/rust-lang/rust/pull/36014
7141 [36029]: https://github.com/rust-lang/rust/pull/36029
7142 [36059]: https://github.com/rust-lang/rust/pull/36059
7143 [36072]: https://github.com/rust-lang/rust/pull/36072
7144 [36101]: https://github.com/rust-lang/rust/pull/36101
7145 [36104]: https://github.com/rust-lang/rust/pull/36104
7146 [36171]: https://github.com/rust-lang/rust/pull/36171
7147 [36173]: https://github.com/rust-lang/rust/pull/36173
7148 [36178]: https://github.com/rust-lang/rust/pull/36178
7149 [36213]: https://github.com/rust-lang/rust/pull/36213
7150 [36214]: https://github.com/rust-lang/rust/pull/36214
7151 [36264]: https://github.com/rust-lang/rust/pull/36264
7152 [36266]: https://github.com/rust-lang/rust/pull/36266
7153 [36289]: https://github.com/rust-lang/rust/pull/36289
7154 [36338]: https://github.com/rust-lang/rust/pull/36338
7155 [36351]: https://github.com/rust-lang/rust/pull/36351
7156 [36355]: https://github.com/rust-lang/rust/pull/36355
7157 [36369]: https://github.com/rust-lang/rust/pull/36369
7158 [36372]: https://github.com/rust-lang/rust/pull/36372
7159 [36423]: https://github.com/rust-lang/rust/pull/36423
7160 [36482]: https://github.com/rust-lang/rust/pull/36482
7161 [36505]: https://github.com/rust-lang/rust/pull/36505
7162 [36524]: https://github.com/rust-lang/rust/pull/36524
7163 [36527]: https://github.com/rust-lang/rust/pull/36527
7164 [36551]: https://github.com/rust-lang/rust/pull/36551
7165 [36574]: https://github.com/rust-lang/rust/pull/36574
7166 [36586]: https://github.com/rust-lang/rust/pull/36586
7167 [36592]: https://github.com/rust-lang/rust/pull/36592
7168 [36631]: https://github.com/rust-lang/rust/pull/36631
7169 [36721]: https://github.com/rust-lang/rust/pull/36721
7170 [36727]: https://github.com/rust-lang/rust/pull/36727
7171 [36730]: https://github.com/rust-lang/rust/pull/36730
7172 [36734]: https://github.com/rust-lang/rust/pull/36734
7173 [36754]: https://github.com/rust-lang/rust/pull/36754
7174 [36995]: https://github.com/rust-lang/rust/pull/36995
7175 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
7176 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
7177 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
7178 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
7179 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
7180 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
7181 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
7182 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
7183 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
7184 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
7185 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
7186 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
7187 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
7188 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
7189 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
7190 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
7191 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
7192 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
7193 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
7194 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
7195 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
7196 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
7197 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
7198 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
7199 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
7200 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
7201 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
7202 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
7203 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
7204 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
7205 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
7206 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
7209 Version 1.12.1 (2016-10-20)
7210 ===========================
7215 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
7216 * [Confusion with double negation and booleans][36856]
7217 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
7218 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
7219 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
7220 * [Corrupted memory after updated to 1.12][36936]
7221 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
7222 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
7223 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
7225 [36381]: https://github.com/rust-lang/rust/issues/36381
7226 [36856]: https://github.com/rust-lang/rust/issues/36856
7227 [36875]: https://github.com/rust-lang/rust/issues/36875
7228 [36924]: https://github.com/rust-lang/rust/issues/36924
7229 [36926]: https://github.com/rust-lang/rust/issues/36926
7230 [36936]: https://github.com/rust-lang/rust/issues/36936
7231 [37026]: https://github.com/rust-lang/rust/issues/37026
7232 [37112]: https://github.com/rust-lang/rust/issues/37112
7233 [37153]: https://github.com/rust-lang/rust/issues/37153
7236 Version 1.12.0 (2016-09-29)
7237 ===========================
7242 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7243 This translation pass is far simpler than the previous AST->LLVM pass, and
7244 creates opportunities to perform new optimizations directly on the MIR. It
7245 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7246 * [`rustc` presents a new, more readable error format, along with
7247 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7248 Most common editors supporting Rust have been updated to work with it. It was
7249 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7254 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
7255 This translation pass is far simpler than the previous AST->LLVM pass, and
7256 creates opportunities to perform new optimizations directly on the MIR. It
7257 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
7258 * [Print the Rust target name, not the LLVM target name, with
7259 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
7260 * [The computation of `TypeId` is correct in some cases where it was previously
7261 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
7262 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
7263 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
7264 `--print relocation-models`, and `--print code-models` print the available
7265 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
7266 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
7267 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
7268 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
7269 These targets produce statically-linked binaries. There are no binary release
7275 * [`rustc` presents a new, more readable error format, along with
7276 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
7277 Most common editors supporting Rust have been updated to work with it. It was
7278 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
7279 * [In error descriptions, references are now described in plain English,
7280 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
7281 * [In error type descriptions, unknown numeric types are named `{integer}` or
7282 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
7283 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
7288 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
7289 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
7290 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
7291 useful](https://github.com/rust-lang/rust/pull/34908)
7292 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
7293 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
7294 * [Semicolons are properly required as statement delimiters inside
7295 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
7296 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
7301 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
7302 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
7303 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
7304 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
7305 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
7306 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
7307 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
7308 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
7309 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
7310 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
7311 Both on Unix and Windows.
7312 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
7313 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
7314 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
7315 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
7316 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
7317 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
7318 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
7319 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
7324 * [The `format!` macro and friends now allow a single argument to be formatted
7325 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
7326 * [The lifetime bounds on `[T]::binary_search_by` and
7327 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
7328 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
7329 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
7330 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
7331 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
7332 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
7333 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
7334 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
7335 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
7336 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
7337 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
7338 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
7339 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
7340 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
7341 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
7342 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
7343 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
7344 * [`mpsc::sync_channel` `Receiver`s return any available message before
7345 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
7346 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
7347 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
7352 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
7353 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
7354 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
7355 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
7356 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
7357 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
7358 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
7359 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
7360 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
7361 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
7362 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
7363 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
7364 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
7365 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
7366 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
7367 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
7372 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
7373 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
7378 * [Test binaries now support a `--test-threads` argument to specify the number
7379 of threads used to run tests, and which acts the same as the
7380 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
7381 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
7382 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
7383 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7384 * [Rust releases now come with source packages that can be installed by rustup
7385 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
7386 The resulting source code can be used by tools and IDES, located in the
7387 sysroot under `lib/rustlib/src`.
7392 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
7393 * Many minor improvements to the documentation.
7394 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
7399 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
7400 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
7401 * [When formatting strings, if "precision" is specified, the "fill",
7402 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
7403 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
7406 Version 1.11.0 (2016-08-18)
7407 ===========================
7412 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
7413 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
7414 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
7415 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
7420 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
7421 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
7422 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
7423 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
7424 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
7425 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
7426 (in libcore - previously stabilized in libstd)
7427 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
7428 (in libcore - previously stabilized in libstd)
7429 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
7430 (in libcore - previously stabilized in libstd)
7431 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
7432 (in libcore - previously stabilized in libstd)
7433 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7434 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
7435 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
7436 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
7441 * [The `thread_local!` macro supports multiple definitions in a single
7442 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
7443 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
7444 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
7445 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
7446 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
7447 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
7448 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
7449 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
7454 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
7455 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
7456 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
7457 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
7458 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
7459 and `-vv` prints warnings for all crates.
7460 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
7461 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
7462 This provides room for expansion by arbitrary tools.
7463 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
7464 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
7465 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
7466 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
7467 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
7468 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
7469 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
7474 * [Caching projections speeds up type check dramatically for some
7475 workloads](https://github.com/rust-lang/rust/pull/33816)
7476 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
7477 This hasher is faster, but is believed to provide sufficient
7478 protection from collision attacks.
7479 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
7484 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
7485 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
7486 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
7487 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
7488 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
7493 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
7494 * [When emitting debug info, rustc emits frame pointers for closures,
7495 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
7496 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
7497 * Many more errors have been given error codes and extended
7499 * API documentation continues to be improved, with many new examples
7504 * [rustc no longer hangs when dependencies recursively re-export
7505 submodules](https://github.com/rust-lang/rust/pull/34542)
7506 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
7507 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
7508 rewritten](https://github.com/rust-lang/rust/pull/33895)
7509 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
7510 No targets use this yet, but it works toward AVR support.
7515 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
7516 * [The new follow-set rules that place restrictions on `macro_rules!`
7517 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
7518 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
7519 and has been a warning since 1.10.
7520 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
7521 This causes breakage in some corner cases.
7524 Version 1.10.0 (2016-07-07)
7525 ===========================
7530 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
7531 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
7532 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
7533 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
7534 * [`panic!` can be converted to a runtime abort with the
7535 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
7536 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7537 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
7538 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
7539 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
7540 Note that Cargo does not yet directly support cdylibs.
7545 * `os::windows::fs::OpenOptionsExt::access_mode`
7546 * `os::windows::fs::OpenOptionsExt::share_mode`
7547 * `os::windows::fs::OpenOptionsExt::custom_flags`
7548 * `os::windows::fs::OpenOptionsExt::attributes`
7549 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
7550 * `os::unix::fs::OpenOptionsExt::custom_flags`
7551 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
7552 * `Default for sync::Weak`
7553 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
7554 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
7555 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
7556 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
7557 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
7558 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
7559 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
7560 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
7561 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
7562 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
7563 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
7564 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
7565 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
7566 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
7567 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
7568 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
7569 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
7570 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
7571 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
7572 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
7573 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
7574 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
7575 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
7576 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
7577 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
7578 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7579 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7580 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
7581 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
7582 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
7583 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
7584 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
7585 * Read/Write/RawFd impls for `UnixStream`
7586 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
7587 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
7588 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
7589 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
7590 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
7591 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
7592 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
7593 * RawFd impls for `UnixListener`
7594 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
7595 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
7596 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
7597 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
7598 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
7599 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
7600 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
7601 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
7602 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
7603 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
7604 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
7605 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
7606 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
7607 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
7608 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
7609 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
7610 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
7611 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
7612 * RawFd impls for `UnixDatagram`
7613 * `{BTree,Hash}Map::values_mut`
7614 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
7619 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
7620 The semantics of this minor method are subtle and probably not what
7622 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
7623 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
7624 will fall back to `/dev/urandom` temporarily to avoid blocking
7625 during early boot](https://github.com/rust-lang/rust/pull/33086).
7626 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
7627 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
7628 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
7629 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
7630 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
7631 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
7632 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
7636 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
7637 This controls the runtime behavior of the `panic!` macro
7638 and can be either "unwind" (the default), or "abort".
7639 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
7640 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
7641 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
7642 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
7643 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
7644 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
7645 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
7646 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
7647 By default they are retried twice, which can be customized with the
7648 `net.retry` value in `.cargo/config`.
7649 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
7650 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
7651 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
7652 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
7653 Makes it possible to install multiple crates in parallel.
7654 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
7655 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
7656 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
7657 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
7658 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
7659 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
7664 * [rustc memory usage was reduced by refactoring the context used for
7665 type checking](https://github.com/rust-lang/rust/pull/33425).
7666 * [Speed up creation of `HashMap`s by caching the random keys used
7667 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
7668 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
7669 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
7670 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
7671 10x faster than the previous lookup tables.
7672 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
7677 * Many incremental improvements to documentation and rustdoc.
7678 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
7679 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
7680 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
7681 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
7682 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
7683 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
7684 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
7689 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
7690 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
7691 * [`std` no longer prints backtraces on platforms where the running
7692 module must be loaded with `env::current_exe`, which can't be relied
7693 on](https://github.com/rust-lang/rust/pull/33554).
7694 * This release includes std binaries for the i586-unknown-linux-gnu,
7695 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
7696 i586 target is for old x86 hardware without SSE2, and the armv7
7697 target is for Android running on modern ARM architectures.
7698 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
7699 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
7700 * [On Unix the runtime aborts by calling `libc::abort` instead of
7701 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
7702 * [Rust is now bootstrapped from the previous release of Rust,
7703 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
7708 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
7709 * [`target_env` for Linux ARM targets is just `gnu`, not
7710 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
7711 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
7712 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
7713 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
7714 Affects how macros are parsed.
7715 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
7716 * [Feature-gated attributes on macro-generated macro invocations are
7717 now rejected](https://github.com/rust-lang/rust/pull/32791).
7718 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
7719 This caused some minor changes to type inference.
7722 Version 1.9.0 (2016-05-26)
7723 ==========================
7728 * The `#[deprecated]` attribute when applied to an API will generate
7729 warnings when used. The warnings may be suppressed with
7730 `#[allow(deprecated)]`. [RFC 1270].
7731 * [`fn` item types are zero sized, and each `fn` names a unique
7732 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7733 `transmute` on a `fn` type will generate a warning for a few cycles,
7734 then will be converted to an error.
7735 * [Field and method resolution understand visibility, so private
7736 fields and methods cannot prevent the proper use of public fields
7737 and methods][1.9fv].
7738 * [The parser considers unicode codepoints in the
7739 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
7745 * [`std::panic::catch_unwind`] (renamed from `recover`)
7746 * [`std::panic::resume_unwind`] (renamed from `propagate`)
7747 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
7748 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
7749 * [`str::is_char_boundary`]
7750 * [`<*const T>::as_ref`]
7751 * [`<*mut T>::as_ref`]
7752 * [`<*mut T>::as_mut`]
7753 * [`AsciiExt::make_ascii_uppercase`]
7754 * [`AsciiExt::make_ascii_lowercase`]
7755 * [`char::decode_utf16`]
7756 * [`char::DecodeUtf16`]
7757 * [`char::DecodeUtf16Error`]
7758 * [`char::DecodeUtf16Error::unpaired_surrogate`]
7759 * [`BTreeSet::take`]
7760 * [`BTreeSet::replace`]
7763 * [`HashSet::replace`]
7765 * [`OsString::with_capacity`]
7766 * [`OsString::clear`]
7767 * [`OsString::capacity`]
7768 * [`OsString::reserve`]
7769 * [`OsString::reserve_exact`]
7770 * [`OsStr::is_empty`]
7772 * [`std::os::unix::thread`]
7775 * [`JoinHandleExt::as_pthread_t`]
7776 * [`JoinHandleExt::into_pthread_t`]
7777 * [`HashSet::hasher`]
7778 * [`HashMap::hasher`]
7779 * [`CommandExt::exec`]
7780 * [`File::try_clone`]
7781 * [`SocketAddr::set_ip`]
7782 * [`SocketAddr::set_port`]
7783 * [`SocketAddrV4::set_ip`]
7784 * [`SocketAddrV4::set_port`]
7785 * [`SocketAddrV6::set_ip`]
7786 * [`SocketAddrV6::set_port`]
7787 * [`SocketAddrV6::set_flowinfo`]
7788 * [`SocketAddrV6::set_scope_id`]
7789 * [`slice::copy_from_slice`]
7790 * [`ptr::read_volatile`]
7791 * [`ptr::write_volatile`]
7792 * [`OpenOptions::create_new`]
7793 * [`TcpStream::set_nodelay`]
7794 * [`TcpStream::nodelay`]
7795 * [`TcpStream::set_ttl`]
7796 * [`TcpStream::ttl`]
7797 * [`TcpStream::set_only_v6`]
7798 * [`TcpStream::only_v6`]
7799 * [`TcpStream::take_error`]
7800 * [`TcpStream::set_nonblocking`]
7801 * [`TcpListener::set_ttl`]
7802 * [`TcpListener::ttl`]
7803 * [`TcpListener::set_only_v6`]
7804 * [`TcpListener::only_v6`]
7805 * [`TcpListener::take_error`]
7806 * [`TcpListener::set_nonblocking`]
7807 * [`UdpSocket::set_broadcast`]
7808 * [`UdpSocket::broadcast`]
7809 * [`UdpSocket::set_multicast_loop_v4`]
7810 * [`UdpSocket::multicast_loop_v4`]
7811 * [`UdpSocket::set_multicast_ttl_v4`]
7812 * [`UdpSocket::multicast_ttl_v4`]
7813 * [`UdpSocket::set_multicast_loop_v6`]
7814 * [`UdpSocket::multicast_loop_v6`]
7815 * [`UdpSocket::set_multicast_ttl_v6`]
7816 * [`UdpSocket::multicast_ttl_v6`]
7817 * [`UdpSocket::set_ttl`]
7818 * [`UdpSocket::ttl`]
7819 * [`UdpSocket::set_only_v6`]
7820 * [`UdpSocket::only_v6`]
7821 * [`UdpSocket::join_multicast_v4`]
7822 * [`UdpSocket::join_multicast_v6`]
7823 * [`UdpSocket::leave_multicast_v4`]
7824 * [`UdpSocket::leave_multicast_v6`]
7825 * [`UdpSocket::take_error`]
7826 * [`UdpSocket::connect`]
7827 * [`UdpSocket::send`]
7828 * [`UdpSocket::recv`]
7829 * [`UdpSocket::set_nonblocking`]
7834 * [`std::sync::Once` is poisoned if its initialization function
7836 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
7837 * [Most types implement `fmt::Debug`][1.9db].
7838 * [The default buffer size used by `BufReader` and `BufWriter` was
7839 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
7840 used by other languages.
7841 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
7842 `Duration` additionally implements `*=` and `/=`][1.9ta].
7843 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
7844 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
7845 * [`Chain` implements `BufRead`][1.9ch].
7846 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
7851 * [Cargo can now run concurrently][1.9cc].
7852 * [Top-level overrides allow specific revisions of crates to be
7853 overridden through the entire crate graph][1.9ct]. This is intended
7854 to make upgrades easier for large projects, by allowing crates to be
7855 forked temporarily until they've been upgraded and republished.
7856 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
7857 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
7858 on the commandline][1.9cf]. `rustc` arguments can also be specified
7859 in the `build.rustflags` configuration key.
7864 * [The time complexity of comparing variables for equivalence during type
7865 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
7866 to major compilation time improvement in some scenarios.
7867 * [`ToString` is specialized for `str`, giving it the same performance
7868 as `to_owned`][1.9ts].
7869 * [Spawning processes with `Command::output` no longer creates extra
7871 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
7872 for C-like enums][1.9cl].
7877 * [Passing the `--quiet` flag to a test runner will produce
7878 much-abbreviated output][1.9q].
7879 * The Rust Project now publishes std binaries for the
7880 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
7881 `i586-pc-windows-msvc` targets.
7886 * [`std::sync::Once` is poisoned if its initialization function
7888 * [It is illegal to define methods with the same name in overlapping
7889 inherent `impl` blocks][1.9sn].
7890 * [`fn` item types are zero sized, and each `fn` names a unique
7891 type][1.9fn]. This will break code that transmutes `fn`s, so calling
7892 `transmute` on a `fn` type will generate a warning for a few cycles,
7893 then will be converted to an error.
7894 * [Improvements to const evaluation may trigger new errors when integer
7895 literals are out of range][1.9ce].
7898 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
7899 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
7900 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
7901 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
7902 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
7903 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
7904 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
7905 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
7906 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
7907 [1.9db]: https://github.com/rust-lang/rust/pull/32054
7908 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
7909 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
7910 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
7911 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
7912 [1.9o]: https://github.com/rust-lang/rust/pull/32325
7913 [1.9q]: https://github.com/rust-lang/rust/pull/31887
7914 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
7915 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
7916 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
7917 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
7918 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
7919 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
7920 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
7921 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
7922 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7923 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
7924 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
7925 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
7926 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
7927 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
7928 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
7929 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
7930 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
7931 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
7932 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
7933 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
7934 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
7935 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
7936 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
7937 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
7938 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
7939 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
7940 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
7941 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
7942 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
7943 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
7944 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
7945 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
7946 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
7947 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
7948 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
7949 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
7950 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
7951 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
7952 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
7953 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
7954 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
7955 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
7956 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
7957 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
7958 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7959 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7960 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7961 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7962 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7963 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7964 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
7965 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
7966 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
7967 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
7968 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
7969 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
7970 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
7971 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
7972 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
7973 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
7974 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
7975 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
7976 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
7977 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
7978 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
7979 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
7980 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
7981 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
7982 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
7983 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
7984 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
7985 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
7986 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
7987 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
7988 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
7989 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
7990 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
7991 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
7992 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
7993 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
7994 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
7995 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
7996 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
7997 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
7998 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
7999 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
8000 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
8001 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
8002 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
8003 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
8004 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
8005 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
8006 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
8007 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
8010 Version 1.8.0 (2016-04-14)
8011 ==========================
8016 * Rust supports overloading of compound assignment statements like
8017 `+=` by implementing the [`AddAssign`], [`SubAssign`],
8018 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
8019 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
8021 * Empty structs can be defined with braces, as in `struct Foo { }`, in
8022 addition to the non-braced form, `struct Foo;`. [RFC 218].
8028 * [`str::encode_utf16`] (renamed from `utf16_units`)
8029 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
8032 * [`ptr::drop_in_place`]
8034 * [`time::SystemTime`]
8036 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
8037 * [`Instant::elapsed`]
8038 * [`SystemTime::now`]
8039 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
8040 * [`SystemTime::elapsed`]
8041 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
8042 * [`SystemTimeError`]
8043 * [`SystemTimeError::duration`]
8044 * Various impls for `SystemTimeError`
8046 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
8047 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
8048 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
8049 * [The `write!` and `writeln!` macros correctly emit errors if any of
8050 their arguments can't be formatted][1.8w].
8051 * [Various I/O functions support large files on 32-bit Linux][1.8l].
8052 * [The Unix-specific `raw` modules, which contain a number of
8053 redefined C types are deprecated][1.8r], including `os::raw::unix`,
8054 `os::raw::macos`, and `os::raw::linux`. These modules defined types
8055 such as `ino_t` and `dev_t`. The inconsistency of these definitions
8056 across platforms was making it difficult to implement `std`
8057 correctly. Those that need these definitions should use the `libc`
8059 * The Unix-specific `MetadataExt` traits, including
8060 `os::unix::fs::MetadataExt`, which expose values such as inode
8061 numbers [no longer return platform-specific types][1.8r], but
8062 instead return widened integers. [RFC 1415].
8063 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
8064 * [Atomic loads and stores are not volatile][1.8a].
8065 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
8070 * [Inlining hash functions lead to a 3% compile-time improvement in
8071 some workloads][1.8h].
8072 * When using jemalloc, its symbols are [unprefixed so that it
8073 overrides the libc malloc implementation][1.8h]. This means that for
8074 rustc, LLVM is now using jemalloc, which results in a 6%
8075 compile-time improvement on a specific workload.
8076 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
8081 * [32-bit MSVC builds finally implement unwinding][1.8ms].
8082 i686-pc-windows-msvc is now considered a tier-1 platform.
8083 * [The `--print targets` flag prints a list of supported targets][1.8t].
8084 * [The `--print cfg` flag prints the `cfg`s defined for the current
8086 * [`rustc` can be built with an new Cargo-based build system, written
8087 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
8088 build system. To enable it configure with `configure --rustbuild`.
8089 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
8090 variants while also indicating the total number of missing variants
8091 if more than 3][1.8m].
8092 * [Executable stacks are disabled on Linux and BSD][1.8nx].
8093 * The Rust Project now publishes binary releases of the standard
8094 library for a number of tier-2 targets:
8095 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
8096 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
8097 `x86_64-rumprun-netbsd`. These can be installed with
8098 tools such as [multirust][1.8mr].
8103 * [`cargo init` creates a new Cargo project in the current
8104 directory][1.8ci]. It is otherwise like `cargo new`.
8105 * [Cargo has configuration keys for `-v` and
8106 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
8107 `[term]` section of `.cargo/config`.
8108 * [Configuration keys that evaluate to strings or integers can be set
8109 via environment variables][1.8ce]. For example the `build.jobs` key
8110 can be set via `CARGO_BUILD_JOBS`. Environment variables take
8111 precedence over config files.
8112 * [Target-specific dependencies support Rust `cfg` syntax for
8113 describing targets][1.8cfg] so that dependencies for multiple
8114 targets can be specified together. [RFC 1361].
8115 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
8116 `RUSTDOC` take precedence over the `build.target-dir`,
8117 `build.rustc`, and `build.rustdoc` configuration values][1.8cfv].
8118 * [The child process tree is killed on Windows when Cargo is
8120 * [The `build.target` configuration value sets the target platform,
8121 like `--target`][1.8ct].
8126 * [Unstable compiler flags have been further restricted][1.8u]. Since
8127 1.0 `-Z` flags have been considered unstable, and other flags that
8128 were considered unstable additionally required passing `-Z
8129 unstable-options` to access. Unlike unstable language and library
8130 features though, these options have been accessible on the stable
8131 release channel. Going forward, *new unstable flags will not be
8132 available on the stable release channel*, and old unstable flags
8133 will warn about their usage. In the future, all unstable flags will
8134 be unavailable on the stable release channel.
8135 * [It is no longer possible to `match` on empty enum variants using
8136 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
8137 * The Unix-specific `MetadataExt` traits, including
8138 `os::unix::fs::MetadataExt`, which expose values such as inode
8139 numbers [no longer return platform-specific types][1.8r], but
8140 instead return widened integers. [RFC 1415].
8141 * [Modules sourced from the filesystem cannot appear within arbitrary
8142 blocks, but only within other modules][1.8mf].
8143 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
8144 * On Unix, [stack overflow triggers a runtime abort instead of a
8146 * [`Command::spawn` and its equivalents return an error if any of
8147 its command-line arguments contain interior `NUL`s][1.8n].
8148 * [Tuple and unit enum variants from other crates are in the type
8150 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
8151 type instead of `.a` files][1.8st]. Additionally, for the MSVC
8152 toolchain, `rustc` emits import libraries named `foo.dll.lib`
8153 instead of `foo.lib`.
8156 [1.8a]: https://github.com/rust-lang/rust/pull/30962
8157 [1.8b]: https://github.com/rust-lang/rust/pull/31123
8158 [1.8c]: https://github.com/rust-lang/rust/pull/31530
8159 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
8160 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
8161 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
8162 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
8163 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
8164 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
8165 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
8166 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
8167 [1.8cfv]: https://github.com/rust-lang/cargo/issues/2365
8168 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
8169 [1.8h]: https://github.com/rust-lang/rust/pull/31460
8170 [1.8l]: https://github.com/rust-lang/rust/pull/31668
8171 [1.8m]: https://github.com/rust-lang/rust/pull/31020
8172 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
8173 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
8174 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
8175 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
8176 [1.8n]: https://github.com/rust-lang/rust/pull/31056
8177 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
8178 [1.8r]: https://github.com/rust-lang/rust/pull/31551
8179 [1.8so]: https://github.com/rust-lang/rust/pull/31333
8180 [1.8st]: https://github.com/rust-lang/rust/pull/29520
8181 [1.8t]: https://github.com/rust-lang/rust/pull/31358
8182 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
8183 [1.8u]: https://github.com/rust-lang/rust/pull/31793
8184 [1.8v]: https://github.com/rust-lang/rust/pull/31757
8185 [1.8w]: https://github.com/rust-lang/rust/pull/31904
8186 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
8187 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
8188 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
8189 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
8190 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
8191 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
8192 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
8193 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
8194 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
8195 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
8196 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
8197 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
8198 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
8199 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
8200 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
8201 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
8202 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
8203 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
8204 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
8205 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
8206 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
8207 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
8208 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
8209 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
8210 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
8211 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
8212 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
8213 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
8214 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
8215 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
8218 Version 1.7.0 (2016-03-03)
8219 ==========================
8226 * [`Path::strip_prefix`] (renamed from relative_from)
8227 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
8229 * [`Ipv4Addr::is_loopback`]
8230 * [`Ipv4Addr::is_private`]
8231 * [`Ipv4Addr::is_link_local`]
8232 * [`Ipv4Addr::is_multicast`]
8233 * [`Ipv4Addr::is_broadcast`]
8234 * [`Ipv4Addr::is_documentation`]
8236 * [`Ipv6Addr::is_unspecified`]
8237 * [`Ipv6Addr::is_loopback`]
8238 * [`Ipv6Addr::is_multicast`]
8241 * [`Vec::as_mut_slice`]
8243 * [`String::as_str`]
8244 * [`String::as_mut_str`]
8246 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
8248 * `<[T]>::`[`sort_by_key`]
8249 * checked, saturated, and overflowing operations
8250 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
8251 * [`i32::saturating_mul`]
8252 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
8253 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
8254 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
8255 * [`u32::saturating_mul`]
8256 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
8257 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
8258 * and checked, saturated, and overflowing operations for other primitive types
8260 * [`ffi::IntoStringError`]
8261 * [`CString::into_string`]
8262 * [`CString::into_bytes`]
8263 * [`CString::into_bytes_with_nul`]
8264 * `From<CString> for Vec<u8>`
8266 * [`IntoStringError::into_cstring`]
8267 * [`IntoStringError::utf8_error`]
8268 * `Error for IntoStringError`
8270 * [`std::hash::BuildHasher`]
8271 * [`BuildHasher::Hasher`]
8272 * [`BuildHasher::build_hasher`]
8273 * [`std::hash::BuildHasherDefault`]
8274 * [`HashMap::with_hasher`]
8275 * [`HashMap::with_capacity_and_hasher`]
8276 * [`HashSet::with_hasher`]
8277 * [`HashSet::with_capacity_and_hasher`]
8278 * [`std::collections::hash_map::RandomState`]
8279 * [`RandomState::new`]
8280 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
8281 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
8282 from bytes is faster.
8283 * [The performance of `LineWriter` (and thus `io::stdout`) was
8284 improved by using `memchr` to search for newlines][1.7m].
8285 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
8286 `f64` variants were stabilized previously.
8287 * [`BTreeMap` was rewritten to use less memory and improve the performance
8288 of insertion and iteration, the latter by as much as 5x][1.7bm].
8289 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
8290 covariant over their contained type][1.7bt].
8291 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
8292 over their contained type][1.7ll].
8293 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
8295 * [`Any` is implemented for unsized types][1.7a].
8296 * [`Hash` is implemented for `Duration`][1.7h].
8301 * [When running tests with `--test`, rustdoc will pass `--cfg`
8302 arguments to the compiler][1.7dt].
8303 * [The compiler is built with RPATH information by default][1.7rpa].
8304 This means that it will be possible to run `rustc` when installed in
8305 unusual configurations without configuring the dynamic linker search
8307 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
8308 any RPATH entries (emitted with `-C rpath`) *not* take precedence
8309 over `LD_LIBRARY_PATH`.
8314 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
8315 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
8316 * [The `rerun-if-changed` build script directive no longer causes the
8317 build script to incorrectly run twice in certain scenarios][1.7rr].
8322 * Soundness fixes to the interactions between associated types and
8323 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
8324 code that violates the new rules. This is a significant change that
8325 is known to break existing code, so it has emitted warnings for the
8326 new error cases since 1.4 to give crate authors time to adapt. The
8327 details of what is changing are subtle; read the RFC for more.
8328 * [Several bugs in the compiler's visibility calculations were
8329 fixed][1.7v]. Since this was found to break significant amounts of
8330 code, the new errors will be emitted as warnings for several release
8331 cycles, under the `private_in_public` lint.
8332 * Defaulted type parameters were accidentally accepted in positions
8333 that were not intended. In this release, [defaulted type parameters
8334 appearing outside of type definitions will generate a
8335 warning][1.7d], which will become an error in future releases.
8336 * [Parsing "." as a float results in an error instead of 0][1.7p].
8337 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
8338 * [Borrows of closure parameters may not outlive the closure][1.7bc].
8340 [1.7a]: https://github.com/rust-lang/rust/pull/30928
8341 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
8342 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
8343 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
8344 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
8345 [1.7d]: https://github.com/rust-lang/rust/pull/30724
8346 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
8347 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
8348 [1.7f]: https://github.com/rust-lang/rust/pull/30672
8349 [1.7h]: https://github.com/rust-lang/rust/pull/30818
8350 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
8351 [1.7m]: https://github.com/rust-lang/rust/pull/30381
8352 [1.7p]: https://github.com/rust-lang/rust/pull/30681
8353 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
8354 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
8355 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
8356 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
8357 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
8358 [1.7v]: https://github.com/rust-lang/rust/pull/29973
8359 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8360 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
8361 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
8362 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
8363 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
8364 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
8365 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
8366 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
8367 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
8368 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
8369 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
8370 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
8371 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
8372 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
8373 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
8374 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
8375 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
8376 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
8377 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
8378 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
8379 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
8380 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
8381 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
8382 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
8383 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
8384 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
8385 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
8386 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
8387 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
8388 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
8389 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
8390 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
8391 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
8392 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
8393 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
8394 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
8395 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
8396 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
8397 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
8398 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
8399 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
8400 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
8401 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
8402 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
8403 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
8404 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
8405 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
8406 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8407 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
8408 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
8409 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
8410 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
8411 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
8412 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
8413 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
8414 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
8415 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
8416 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
8417 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
8418 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
8421 Version 1.6.0 (2016-01-21)
8422 ==========================
8427 * The `#![no_std]` attribute causes a crate to not be linked to the
8428 standard library, but only the [core library][1.6co], as described
8429 in [RFC 1184]. The core library defines common types and traits but
8430 has no platform dependencies whatsoever, and is the basis for Rust
8431 software in environments that cannot support a full port of the
8432 standard library, such as operating systems. Most of the core
8433 library is now stable.
8439 [`Read::read_exact`],
8440 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
8441 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
8442 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
8443 [`os::unix::fs::DirBuilderExt`],
8444 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
8445 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
8446 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
8447 [`collections::hash_map::Drain`],
8448 [`collections::hash_map::HashMap::drain`],
8449 [`collections::hash_set::Drain`],
8450 [`collections::hash_set::HashSet::drain`],
8451 [`collections::binary_heap::Drain`],
8452 [`collections::binary_heap::BinaryHeap::drain`],
8453 [`Vec::extend_from_slice`] (renamed from `push_all`),
8454 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
8455 [`RwLock::into_inner`],
8456 [`Iterator::min_by_key`] (renamed from `min_by`),
8457 [`Iterator::max_by_key`] (renamed from `max_by`).
8458 * The [core library][1.6co] is stable, as are most of its APIs.
8459 * [The `assert_eq!` macro supports arguments that don't implement
8460 `Sized`][1.6ae], such as arrays. In this way it behaves more like
8462 * Several timer functions that take duration in milliseconds [are
8463 deprecated in favor of those that take `Duration`][1.6ms]. These
8464 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
8465 `thread::park_timeout_ms`.
8466 * The algorithm by which `Vec` reserves additional elements was
8467 [tweaked to not allocate excessive space][1.6a] while still growing
8469 * `From` conversions are [implemented from integers to floats][1.6f]
8470 in cases where the conversion is lossless. Thus they are not
8471 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
8472 or `f64`. They are also not implemented for `isize` and `usize`
8473 because the implementations would be platform-specific. `From` is
8474 also implemented from `f32` to `f64`.
8475 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
8476 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
8477 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
8478 * [`BinaryHeap` was refactored][1.6bh] for modest performance
8480 * Sorting slices that are already sorted [is 50% faster in some
8486 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
8487 * Cargo build scripts can specify their dependencies by emitting the
8488 [`rerun-if-changed`][1.6rr] key.
8489 * crates.io will reject publication of crates with dependencies that
8490 have a wildcard version constraint. Crates with wildcard
8491 dependencies were seen to cause a variety of problems, as described
8492 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
8494 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
8495 release folder. A variety of artifacts that Cargo failed to clean
8496 are now correctly deleted.
8501 * The `unreachable_code` lint [warns when a function call's argument
8503 * The parser indicates [failures that may be caused by
8504 confusingly-similar Unicode characters][1.6uc]
8505 * Certain macro errors [are reported at definition time][1.6m], not
8511 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
8512 environment variable when locating crates. This was a pre-cargo
8513 feature for integrating with the package manager that was
8514 accidentally never removed.
8515 * [A number of bugs were fixed in the privacy checker][1.6p] that
8516 could cause previously-accepted code to break.
8517 * [Modules and unit/tuple structs may not share the same name][1.6ts].
8518 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
8519 struct pattern syntax (`Foo(..)`) can no longer be used to match
8520 unit structs. This is a warning now, but will become an error in
8521 future releases. Patterns that share the same name as a const are
8523 * A bug was fixed that causes [rustc not to apply default type
8524 parameters][1.6xc] when resolving certain method implementations of
8525 traits defined in other crates.
8527 [1.6a]: https://github.com/rust-lang/rust/pull/29454
8528 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
8529 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
8530 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
8531 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
8532 [1.6co]: http://doc.rust-lang.org/core/index.html
8533 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
8534 [1.6f]: https://github.com/rust-lang/rust/pull/29129
8535 [1.6m]: https://github.com/rust-lang/rust/pull/29828
8536 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
8537 [1.6p]: https://github.com/rust-lang/rust/pull/29726
8538 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
8539 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
8540 [1.6s]: https://github.com/rust-lang/rust/pull/29675
8541 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
8542 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
8543 [1.6us]: https://github.com/rust-lang/rust/pull/29383
8544 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
8545 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
8546 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8547 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
8548 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
8549 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
8550 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
8551 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
8552 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
8553 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
8554 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
8555 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
8556 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
8557 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
8558 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
8559 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
8560 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
8561 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
8562 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
8563 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
8564 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
8565 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
8566 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
8567 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
8568 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
8569 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
8570 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
8571 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
8572 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
8573 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
8576 Version 1.5.0 (2015-12-10)
8577 ==========================
8579 * ~700 changes, numerous bugfixes
8585 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
8586 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
8587 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
8588 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
8589 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
8590 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
8591 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
8592 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
8593 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
8594 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
8595 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
8596 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
8597 [`Path::read_link`], [`Path::symlink_metadata`],
8598 [`Utf8Error::valid_up_to`], [`Vec::resize`],
8599 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
8600 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
8601 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
8602 [`slice::split_first_mut`], [`slice::split_first`],
8603 [`slice::split_last_mut`], [`slice::split_last`],
8604 [`char::from_u32_unchecked`], [`fs::canonicalize`],
8605 [`str::MatchIndices`], [`str::RMatchIndices`],
8606 [`str::match_indices`], [`str::rmatch_indices`],
8607 [`str::slice_mut_unchecked`], [`string::ParseError`].
8608 * Rust applications hosted on crates.io can be installed locally to
8609 `~/.cargo/bin` with the [`cargo install`] command. Among other
8610 things this makes it easier to augment Cargo with new subcommands:
8611 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
8612 invoked as `cargo foo`.
8613 * Crates with wildcard (`*`) dependencies will [emit warnings when
8614 published][1.5w]. In 1.6 it will no longer be possible to publish
8615 crates with wildcard dependencies.
8620 * The rules determining when a particular lifetime must outlive
8621 a particular value (known as '[dropck]') have been [modified
8622 to not rely on parametricity][1.5p].
8623 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
8624 and `Arc`][1.5a]. Because these smart pointer types implement
8625 `Deref`, this causes breakage in cases where the interior type
8626 contains methods of the same name.
8627 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
8628 that they could drop their content. Soundness fix.
8629 * All method invocations are [properly checked][1.5wf1] for
8630 [well-formedness][1.5wf2]. Soundness fix.
8631 * Traits whose supertraits contain `Self` are [not object
8632 safe][1.5o]. Soundness fix.
8633 * Target specifications support a [`no_default_libraries`][1.5nd]
8634 setting that controls whether `-nodefaultlibs` is passed to the
8635 linker, and in turn the `is_like_windows` setting no longer affects
8636 the `-nodefaultlibs` flag.
8637 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
8638 * The `#[inline]` and `#[repr]` attributes [can only appear
8639 in valid locations][1.5at].
8640 * Native libraries linked from the local crate are [passed to
8641 the linker before native libraries from upstream crates][1.5nl].
8642 * Two rarely-used attributes, `#[no_debug]` and
8643 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
8644 * Negation of unsigned integers, which has been a warning for
8645 several releases, [is now behind a feature gate and will
8646 generate errors][1.5nu].
8647 * The parser accidentally accepted visibility modifiers on
8648 enum variants, a bug [which has been fixed][1.5ev].
8649 * [A bug was fixed that allowed `use` statements to import unstable
8655 * When evaluating expressions at compile-time that are not
8656 compile-time constants (const-evaluating expressions in non-const
8657 contexts), incorrect code such as overlong bitshifts and arithmetic
8658 overflow will [generate a warning instead of an error][1.5ce],
8659 delaying the error until runtime. This will allow the
8660 const-evaluator to be expanded in the future backwards-compatibly.
8661 * The `improper_ctypes` lint [no longer warns about using `isize` and
8662 `usize` in FFI][1.5ict].
8667 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
8669 * `Default` is [implemented for mutable slices][1.5d].
8670 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
8671 * There are now `From` conversions [between floating point
8672 types][1.5f] where the conversions are lossless.
8673 * There are now `From` conversions [between integer types][1.5i] where
8674 the conversions are lossless.
8675 * [`fs::Metadata` implements `Clone`][1.5fs].
8676 * The `parse` method [accepts a leading "+" when parsing
8678 * [`AsMut` is implemented for `Vec`][1.5am].
8679 * The `clone_from` implementations for `String` and `BinaryHeap` [have
8680 been optimized][1.5cf] and no longer rely on the default impl.
8681 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
8682 `unsafe extern "C"` function types now [implement `Clone`,
8683 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
8684 `fmt::Debug` for up to 12 arguments][1.5fp].
8685 * [Dropping `Vec`s is much faster in unoptimized builds when the
8686 element types don't implement `Drop`][1.5dv].
8687 * A bug that caused in incorrect behavior when [combining `VecDeque`
8688 with zero-sized types][1.5vdz] was resolved.
8689 * [`PartialOrd` for slices is faster][1.5po].
8694 * [Crate metadata size was reduced by 20%][1.5md].
8695 * [Improvements to code generation reduced the size of libcore by 3.3
8696 MB and rustc's memory usage by 18MB][1.5m].
8697 * [Improvements to deref translation increased performance in
8698 unoptimized builds][1.5dr].
8699 * Various errors in trait resolution [are deduplicated to only be
8700 reported once][1.5te].
8701 * Rust has preliminary [support for rumprun kernels][1.5rr].
8702 * Rust has preliminary [support for NetBSD on amd64][1.5na].
8704 [1.5use]: https://github.com/rust-lang/rust/pull/28364
8705 [1.5po]: https://github.com/rust-lang/rust/pull/28436
8706 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
8707 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
8708 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
8709 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
8710 [1.5md]: https://github.com/rust-lang/rust/pull/28521
8711 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
8712 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
8713 [1.5na]: https://github.com/rust-lang/rust/pull/28543
8714 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
8715 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
8716 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
8717 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
8718 [1.5te]: https://github.com/rust-lang/rust/pull/28645
8719 [1.5at]: https://github.com/rust-lang/rust/pull/28650
8720 [1.5am]: https://github.com/rust-lang/rust/pull/28663
8721 [1.5m]: https://github.com/rust-lang/rust/pull/28778
8722 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
8723 [1.5a]: https://github.com/rust-lang/rust/pull/28811
8724 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
8725 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
8726 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
8727 [1.5i]: https://github.com/rust-lang/rust/pull/28921
8728 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
8729 [1.5f]: https://github.com/rust-lang/rust/pull/29129
8730 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
8731 [1.5s]: https://github.com/rust-lang/rust/pull/29190
8732 [1.5d]: https://github.com/rust-lang/rust/pull/29245
8733 [1.5o]: https://github.com/rust-lang/rust/pull/29259
8734 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
8735 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8736 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
8737 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
8738 [1.5c]: https://github.com/rust-lang/rust/pull/29110
8739 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
8740 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
8741 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
8742 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
8743 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
8744 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
8745 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
8746 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
8747 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
8748 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
8749 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
8750 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
8751 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
8752 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
8753 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
8754 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
8755 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
8756 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
8757 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
8758 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
8759 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
8760 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
8761 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
8762 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
8763 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
8764 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
8765 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
8766 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
8767 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
8768 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
8769 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
8770 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
8771 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
8772 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
8773 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
8774 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
8775 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
8776 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
8777 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
8778 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
8779 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
8780 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
8781 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
8782 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
8783 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
8784 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
8785 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
8786 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
8787 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
8788 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
8789 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
8790 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
8791 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
8792 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
8794 Version 1.4.0 (2015-10-29)
8795 ==========================
8797 * ~1200 changes, numerous bugfixes
8802 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
8803 GNU) are now supported and recommended for use.
8808 * [Several changes have been made to fix type soundness and improve
8809 the behavior of associated types][sound]. See [RFC 1214]. Although
8810 we have mostly introduced these changes as warnings this release, to
8811 become errors next release, there are still some scenarios that will
8812 see immediate breakage.
8813 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
8814 line breaks in addition to `\n`][crlf].
8815 * [Loans of `'static` lifetime extend to the end of a function][stat].
8816 * [`str::parse` no longer introduces avoidable rounding error when
8817 parsing floating point numbers. Together with earlier changes to
8818 float formatting/output, "round trips" like f.to_string().parse()
8819 now preserve the value of f exactly. Additionally, leading plus
8820 signs are now accepted][fp3].
8826 * `use` statements that import multiple items [can now rename
8827 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
8828 * [Binops work correctly on fat pointers][binfat].
8829 * `pub extern crate`, which does not behave as expected, [issues a
8830 warning][pec] until a better solution is found.
8835 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
8836 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
8837 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
8838 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
8839 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
8840 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
8841 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
8842 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
8843 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
8844 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
8845 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
8846 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
8847 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
8848 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
8849 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
8850 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
8851 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
8852 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
8854 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
8855 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
8856 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
8857 `f64::from_str_radix`.
8858 * [Reverse-searching strings is faster with the 'two-way'
8860 * [`std::io::copy` allows `?Sized` arguments][cc].
8861 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
8862 [override `count`, `nth` and `last` with an *O*(1)
8863 implementation][it].
8864 * [`Default` is implemented for arrays up to `[T; 32]`][d].
8865 * [`IntoRawFd` has been added to the Unix-specific prelude,
8866 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
8868 * [`Extend<String>` and `FromIterator<String` are both implemented for
8870 * [`IntoIterator` is implemented for references to `Option` and
8872 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
8873 Copy`][ext] as part of [RFC 839]. This will cause type inference
8874 breakage in rare situations.
8875 * [`BinaryHeap` implements `Debug`][bh2].
8876 * [`Borrow` and `BorrowMut` are implemented for fixed-size
8878 * [`extern fn`s with the "Rust" and "C" ABIs implement common
8879 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
8880 * [String comparison is faster][faststr].
8881 * `&mut T` where `T: std::fmt::Write` [also implements
8882 `std::fmt::Write`][mutw].
8883 * [A stable regression in `VecDeque::push_back` and other
8884 capacity-altering methods that caused panics for zero-sized types
8886 * [Function pointers implement traits for up to 12 parameters][fp2].
8891 * The compiler [no longer uses the 'morestack' feature to prevent
8892 stack overflow][mm]. Instead it uses guard pages and stack
8893 probes (though stack probes are not yet implemented on any platform
8895 * [The compiler matches traits faster when projections are involved][p].
8896 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
8898 * [Cargo now displays useful information about what its doing during
8899 `cargo update`][cu].
8901 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
8902 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
8903 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
8904 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
8905 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
8906 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
8907 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
8908 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
8909 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
8910 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
8911 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
8912 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
8913 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
8914 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
8915 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
8916 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
8917 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
8918 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
8919 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8920 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8921 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8922 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8923 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
8924 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
8925 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
8926 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
8927 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
8928 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
8929 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
8930 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
8931 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
8932 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
8933 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
8934 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
8935 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
8936 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
8937 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
8938 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
8939 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
8940 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
8941 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
8942 [bh2]: https://github.com/rust-lang/rust/pull/28156
8943 [binfat]: https://github.com/rust-lang/rust/pull/28270
8944 [bm]: https://github.com/rust-lang/rust/pull/28197
8945 [cc]: https://github.com/rust-lang/rust/pull/27531
8946 [crlf]: https://github.com/rust-lang/rust/pull/28034
8947 [cu]: https://github.com/rust-lang/cargo/pull/1931
8948 [d]: https://github.com/rust-lang/rust/pull/27825
8949 [dep]: https://github.com/rust-lang/rust/pull/28339
8950 [es]: https://github.com/rust-lang/rust/pull/27956
8951 [ext]: https://github.com/rust-lang/rust/pull/28094
8952 [faststr]: https://github.com/rust-lang/rust/pull/28338
8953 [ffi]: https://github.com/rust-lang/rust/pull/28779
8954 [fp]: https://github.com/rust-lang/rust/pull/28268
8955 [fp2]: https://github.com/rust-lang/rust/pull/28560
8956 [fp3]: https://github.com/rust-lang/rust/pull/27307
8957 [i]: https://github.com/rust-lang/rust/pull/27451
8958 [into2]: https://github.com/rust-lang/rust/pull/28039
8959 [it]: https://github.com/rust-lang/rust/pull/27652
8960 [mm]: https://github.com/rust-lang/rust/pull/27338
8961 [mutw]: https://github.com/rust-lang/rust/pull/28368
8962 [sound]: https://github.com/rust-lang/rust/pull/27641
8963 [p]: https://github.com/rust-lang/rust/pull/27866
8964 [pec]: https://github.com/rust-lang/rust/pull/28486
8965 [pr]: https://github.com/rust-lang/rust/pull/27896
8966 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
8967 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
8968 [s]: https://github.com/rust-lang/rust/pull/27474
8969 [stab]: https://github.com/rust-lang/rust/pull/28339
8970 [stat]: https://github.com/rust-lang/rust/pull/28321
8971 [vd]: https://github.com/rust-lang/rust/pull/28494
8973 Version 1.3.0 (2015-09-17)
8974 ==============================
8976 * ~900 changes, numerous bugfixes
8981 * The [new object lifetime defaults][nold] have been [turned
8982 on][nold2] after a cycle of warnings about the change. Now types
8983 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
8984 being interpreted as `&'a Box<Trait+'a>` to `&'a
8985 Box<Trait+'static>`.
8986 * [The Rustonomicon][nom] is a new book in the official documentation
8987 that dives into writing unsafe Rust.
8988 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
8989 timekeeping is employed by other std APIs, as well as out-of-tree
8995 * The [new object lifetime defaults][nold] have been [turned
8996 on][nold2] after a cycle of warnings about the change.
8997 * There is a known [regression][lr] in how object lifetime elision is
8998 interpreted, the proper solution for which is undetermined.
8999 * The `#[prelude_import]` attribute, an internal implementation
9000 detail, was accidentally stabilized previously. [It has been put
9001 behind the `prelude_import` feature gate][pi]. This change is
9002 believed to break no existing code.
9003 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9004 [more sane for dynamically sized types][dst3]. Code that relied on
9005 the previous behavior is thought to be broken.
9006 * The `dropck` rules, which checks that destructors can't access
9007 destroyed values, [have been updated][dropck] to match the
9008 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
9009 cause some previously-compiling code to no longer build.
9014 * The [new object lifetime defaults][nold] have been [turned
9015 on][nold2] after a cycle of warnings about the change.
9016 * Semicolons may [now follow types and paths in
9017 macros](https://github.com/rust-lang/rust/pull/27000).
9018 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
9019 [more sane for dynamically sized types][dst3]. Code that relied on
9020 the previous behavior is not known to exist, and suspected to be
9022 * `'static` variables [may now be recursive][st].
9023 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
9024 implementations correctly.
9025 * The `dropck` rules, which checks that destructors can't access
9026 destroyed values, [have been updated][dropck] to match the
9032 * The [`Duration`] API, [has been stabilized][ds], as well as the
9033 `std::time` module, which presently contains only `Duration`.
9034 * `Box<str>` and `Box<[T]>` both implement `Clone`.
9035 * The owned C string, [`CString`], implements [`Borrow`] and the
9036 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
9037 these allow C strings to be borrowed and cloned in generic code.
9038 * [`CStr`] implements [`Debug`].
9039 * [`AtomicPtr`] implements [`Debug`].
9040 * [`Error`] trait objects [can be downcast to their concrete types][e]
9041 in many common configurations, using the [`is`], [`downcast`],
9042 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
9044 * Searching for substrings now [employs the two-way algorithm][search]
9045 instead of doing a naive search. This gives major speedups to a
9046 number of methods, including [`contains`][sc], [`find`][sf],
9047 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
9048 [`ends_with`][sew] are also faster.
9049 * The performance of `PartialEq` for slices is [much faster][ps].
9050 * The [`Hash`] trait offers the default method, [`hash_slice`], which
9051 is overridden and optimized by the implementations for scalars.
9052 * The [`Hasher`] trait now has a number of specialized `write_*`
9053 methods for primitive types, for efficiency.
9054 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
9055 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
9056 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
9057 of [`std::error::Error::cause`][iec] also delegates to the inner
9059 * [`process::Child`][pc] gained the [`id`] method, which returns a
9060 `u32` representing the platform-specific process identifier.
9061 * The [`connect`] method on slices is deprecated, replaced by the new
9062 [`join`] method (note that both of these are on the *unstable*
9063 [`SliceConcatExt`] trait, but through the magic of the prelude are
9064 available to stable code anyway).
9065 * The [`Div`] operator is implemented for [`Wrapping`] types.
9066 * [`DerefMut` is implemented for `String`][dms].
9067 * Performance of SipHash (the default hasher for `HashMap`) is
9068 [better for long data][sh].
9069 * [`AtomicPtr`] implements [`Send`].
9070 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
9071 are now [specialized to use uninitialized buffers for increased
9073 * Lifetime parameters of foreign functions [are now resolved
9079 * Rust can now, with some coercion, [produce programs that run on
9080 Windows XP][xp], though XP is not considered a supported platform.
9081 * Porting Rust on Windows from the GNU toolchain to MSVC continues
9082 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
9083 recommended for use in 1.3, though should be fully-functional
9084 in the [64-bit 1.4 beta][b14].
9085 * On Fedora-based systems installation will [properly configure the
9086 dynamic linker][fl].
9087 * The compiler gained many new extended error descriptions, which can
9088 be accessed with the `--explain` flag.
9089 * The `dropck` pass, which checks that destructors can't access
9090 destroyed values, [has been rewritten][27261]. This fixes some
9091 soundness holes, and as such will cause some previously-compiling
9092 code to no longer build.
9093 * `rustc` now uses [LLVM to write archive files where possible][ar].
9094 Eventually this will eliminate the compiler's dependency on the ar
9096 * Rust has [preliminary support for i686 FreeBSD][26959] (it has long
9097 supported FreeBSD on x86_64).
9098 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
9099 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
9101 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
9102 will kill the process instead of leaking][nlp].
9104 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
9105 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
9106 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
9107 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
9108 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
9109 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9110 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9111 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
9112 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
9113 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
9114 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
9115 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
9116 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
9117 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
9118 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
9119 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
9120 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
9121 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
9122 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9123 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
9124 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
9125 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
9126 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
9127 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
9128 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
9129 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
9130 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
9131 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
9132 [ar]: https://github.com/rust-lang/rust/pull/26926
9133 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
9134 [dms]: https://github.com/rust-lang/rust/pull/26241
9135 [27261]: https://github.com/rust-lang/rust/pull/27261
9136 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9137 [ds]: https://github.com/rust-lang/rust/pull/26818
9138 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
9139 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
9140 [dst3]: https://github.com/rust-lang/rust/pull/27351
9141 [e]: https://github.com/rust-lang/rust/pull/24793
9142 [f]: https://github.com/rust-lang/rust/pull/26588
9143 [26959]: https://github.com/rust-lang/rust/pull/26959
9144 [fl]: https://github.com/rust-lang/rust-installer/pull/41
9145 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
9146 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
9147 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
9148 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
9149 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
9150 [lic]: https://github.com/rust-lang/rust/pull/26583
9151 [lnu]: https://github.com/rust-lang/rust/pull/27026
9152 [lr]: https://github.com/rust-lang/rust/issues/27248
9153 [lum]: https://github.com/rust-lang/rust/pull/26378
9154 [lur]: https://github.com/rust-lang/rust/pull/26783
9155 [nlp]: https://github.com/rust-lang/rust/pull/27176
9156 [nold2]: https://github.com/rust-lang/rust/pull/27045
9157 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
9158 [nom]: http://doc.rust-lang.org/nightly/nomicon/
9159 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
9160 [pi]: https://github.com/rust-lang/rust/pull/26699
9161 [ps]: https://github.com/rust-lang/rust/pull/26884
9162 [rte]: https://github.com/rust-lang/rust/pull/26950
9163 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
9164 [search]: https://github.com/rust-lang/rust/pull/26327
9165 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
9166 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
9167 [sh]: https://github.com/rust-lang/rust/pull/27280
9168 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
9169 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
9170 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
9171 [st]: https://github.com/rust-lang/rust/pull/26630
9172 [win1]: https://github.com/rust-lang/rust/pull/26569
9173 [win2]: https://github.com/rust-lang/rust/pull/26741
9174 [win3]: https://github.com/rust-lang/rust/pull/26741
9175 [win4]: https://github.com/rust-lang/rust/pull/27210
9176 [xp]: https://github.com/rust-lang/rust/pull/26569
9178 Version 1.2.0 (2015-08-07)
9179 ==========================
9181 * ~1200 changes, numerous bugfixes
9186 * [Dynamically-sized-type coercions][dst] allow smart pointer types
9187 like `Rc` to contain types without a fixed size, arrays and trait
9188 objects, finally enabling use of `Rc<[T]>` and completing the
9189 implementation of DST.
9190 * [Parallel codegen][parcodegen] is now working again, which can
9191 substantially speed up large builds in debug mode; It also gets
9192 another ~33% speedup when bootstrapping on a 4 core machine (using 8
9193 jobs). It's not enabled by default, but will be "in the near
9194 future". It can be activated with the `-C codegen-units=N` flag to
9196 * This is the first release with [experimental support for linking
9197 with the MSVC linker and lib C on Windows (instead of using the GNU
9198 variants via MinGW)][win]. It is yet recommended only for the most
9199 intrepid Rustaceans.
9200 * Benchmark compilations are showing a 30% improvement in
9201 bootstrapping over 1.1.
9206 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
9207 unicode case mapping, which is a previously-planned change in
9208 behavior and considered a bugfix.
9209 * [`mem::align_of`] now specifies [the *minimum alignment* for
9210 T][align], which is usually the alignment programs are interested
9211 in, and the same value reported by clang's
9212 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
9214 * [The `#[packed]` attribute is no longer silently accepted by the
9215 compiler][packed]. This attribute did nothing and code that
9216 mentioned it likely did not work as intended.
9217 * Associated type defaults are [now behind the
9218 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
9219 defaults *did not work*, but could be mentioned syntactically. As
9220 such this breakage has minimal impact.
9225 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
9226 matching against dereferenceable values.
9231 * The [`Extend`] trait, which grows a collection from an iterator, is
9232 implemented over iterators of references, for `String`, `Vec`,
9233 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
9234 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
9235 * The [`iter::once`] function returns an iterator that yields a single
9236 element, and [`iter::empty`] returns an iterator that yields no
9238 * The [`matches`] and [`rmatches`] methods on `str` return iterators
9239 over substring matches.
9240 * [`Cell`] and [`RefCell`] both implement `Eq`.
9241 * A number of methods for wrapping arithmetic are added to the
9242 integral types, [`wrapping_div`], [`wrapping_rem`],
9243 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
9244 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
9245 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
9246 type.. It is illegal for the default arithmetic operations in Rust
9247 to overflow; the desire to wrap must be explicit.
9248 * The `{:#?}` formatting specifier [displays the alternate,
9249 pretty-printed][debugfmt] form of the `Debug` formatter. This
9250 feature was actually introduced prior to 1.0 with little
9252 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
9253 for writing data to formatted strings, similar to [`io::Write`].
9254 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
9255 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
9256 are used by code generators to emit implementations of [`Debug`].
9257 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
9258 methods that convert case, following Unicode case mapping.
9259 * It is now easier to handle poisoned locks. The [`PoisonError`]
9260 type, returned by failing lock operations, exposes `into_inner`,
9261 `get_ref`, and `get_mut`, which all give access to the inner lock
9262 guard, and allow the poisoned lock to continue to operate. The
9263 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
9264 poisoned lock without attempting to take the lock.
9265 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
9266 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
9267 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
9268 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
9270 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
9276 * `rustc` employs smarter heuristics for guessing at [typos].
9277 * `rustc` emits more efficient code for [no-op conversions between
9278 unsafe pointers][nop].
9279 * Fat pointers are now [passed in pairs of immediate arguments][fat],
9280 resulting in faster compile times and smaller code.
9282 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
9283 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
9284 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
9285 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
9286 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
9287 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
9288 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
9289 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
9290 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
9291 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
9292 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
9293 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
9294 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
9295 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
9296 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
9297 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
9298 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
9299 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
9300 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
9301 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
9302 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
9303 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
9304 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
9305 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
9306 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
9307 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
9308 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
9309 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
9310 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
9311 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
9312 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
9313 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
9314 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
9315 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9316 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9317 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
9318 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
9319 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
9320 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
9321 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
9322 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
9323 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
9324 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
9325 [align]: https://github.com/rust-lang/rust/pull/25646
9326 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
9327 [typos]: https://github.com/rust-lang/rust/pull/26087
9328 [nop]: https://github.com/rust-lang/rust/pull/26336
9329 [fat]: https://github.com/rust-lang/rust/pull/26411
9330 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
9331 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
9332 [packed]: https://github.com/rust-lang/rust/pull/25541
9333 [ad]: https://github.com/rust-lang/rust/pull/27382
9334 [win]: https://github.com/rust-lang/rust/pull/25350
9336 Version 1.1.0 (2015-06-25)
9337 =========================
9339 * ~850 changes, numerous bugfixes
9344 * The [`std::fs` module has been expanded][fs] to expand the set of
9345 functionality exposed:
9346 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
9347 don't incur a syscall on some platforms.
9348 * A `symlink_metadata` function has been added.
9349 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
9350 access to all underlying information.
9351 * The compiler now contains extended explanations of many errors. When an error
9352 with an explanation occurs the compiler suggests using the `--explain` flag
9353 to read the explanation. Error explanations are also [available online][err-index].
9354 * Thanks to multiple [improvements][sk] to [type checking][pre], as
9355 well as other work, the time to bootstrap the compiler decreased by
9361 * The [`str::split_whitespace`] method splits a string on unicode
9362 whitespace boundaries.
9363 * On both Windows and Unix, new extension traits provide conversion of
9364 I/O types to and from the underlying system handles. On Unix, these
9365 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
9366 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
9367 `TcpListener`, and `UpdSocket`. Further implementations for
9368 `std::process` will be stabilized later.
9369 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
9370 Windows, symlinks can be created with
9371 `std::os::windows::symlink_dir` and
9372 `std::os::windows::symlink_file`.
9373 * The `mpsc::Receiver` type can now be converted into an iterator with
9374 `into_iter` on the [`IntoIterator`] trait.
9375 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
9376 implementation of the [`From`] trait.
9377 * The `Debug` implementation for `RangeFull` [creates output that is
9378 more consistent with other implementations][rf].
9379 * [`Debug` is implemented for `File`][file].
9380 * The `Default` implementation for `Arc` [no longer requires `Sync +
9382 * [The `Iterator` methods `count`, `nth`, and `last` have been
9383 overridden for slices to have *O*(1) performance instead of *O*(*n*)][si].
9384 * Incorrect handling of paths on Windows has been improved in both the
9385 compiler and the standard library.
9386 * [`AtomicPtr` gained a `Default` implementation][ap].
9387 * In accordance with Rust's policy on arithmetic overflow `abs` now
9388 [panics on overflow when debug assertions are enabled][abs].
9389 * The [`Cloned`] iterator, which was accidentally left unstable for
9390 1.0 [has been stabilized][c].
9391 * The [`Incoming`] iterator, which iterates over incoming TCP
9392 connections, and which was accidentally unnamable in 1.0, [is now
9393 properly exported][inc].
9394 * [`BinaryHeap`] no longer corrupts itself [when functions called by
9395 `sift_up` or `sift_down` panic][bh].
9396 * The [`split_off`] method of `LinkedList` [no longer corrupts
9397 the list in certain scenarios][ll].
9402 * Type checking performance [has improved notably][sk] with
9403 [multiple improvements][pre].
9404 * The compiler [suggests code changes][ch] for more errors.
9405 * rustc and it's build system have experimental support for [building
9406 toolchains against MUSL][m] instead of glibc on Linux.
9407 * The compiler defines the `target_env` cfg value, which is used for
9408 distinguishing toolchains that are otherwise for the same
9409 platform. Presently this is set to `gnu` for common GNU Linux
9410 targets and for MinGW targets, and `musl` for MUSL Linux targets.
9411 * The [`cargo rustc`][crc] command invokes a build with custom flags
9413 * [Android executables are always position independent][pie].
9414 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
9415 with `Drop`][24935].
9417 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
9418 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
9419 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
9420 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
9421 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
9422 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
9423 [rf]: https://github.com/rust-lang/rust/pull/24491
9424 [err-index]: https://doc.rust-lang.org/error-index.html
9425 [sk]: https://github.com/rust-lang/rust/pull/24615
9426 [pre]: https://github.com/rust-lang/rust/pull/25323
9427 [file]: https://github.com/rust-lang/rust/pull/24598
9428 [ch]: https://github.com/rust-lang/rust/pull/24683
9429 [arc]: https://github.com/rust-lang/rust/pull/24695
9430 [si]: https://github.com/rust-lang/rust/pull/24701
9431 [ap]: https://github.com/rust-lang/rust/pull/24834
9432 [m]: https://github.com/rust-lang/rust/pull/24777
9433 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
9434 [crc]: https://github.com/rust-lang/cargo/pull/1568
9435 [pie]: https://github.com/rust-lang/rust/pull/24953
9436 [abs]: https://github.com/rust-lang/rust/pull/25441
9437 [c]: https://github.com/rust-lang/rust/pull/25496
9438 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
9439 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
9440 [inc]: https://github.com/rust-lang/rust/pull/25522
9441 [bh]: https://github.com/rust-lang/rust/pull/25856
9442 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
9443 [ll]: https://github.com/rust-lang/rust/pull/26022
9444 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
9445 [24935]: https://github.com/rust-lang/rust/pull/24935
9447 Version 1.0.0 (2015-05-15)
9448 ========================
9450 * ~1500 changes, numerous bugfixes
9455 * The vast majority of the standard library is now `#[stable]`. It is
9456 no longer possible to use unstable features with a stable build of
9458 * Many popular crates on [crates.io] now work on the stable release
9460 * Arithmetic on basic integer types now [checks for overflow in debug
9466 * Several [restrictions have been added to trait coherence][coh] in
9467 order to make it easier for upstream authors to change traits
9468 without breaking downstream code.
9469 * Digits of binary and octal literals are [lexed more eagerly][lex] to
9470 improve error messages and macro behavior. For example, `0b1234` is
9471 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
9472 * Trait bounds [are always invariant][inv], eliminating the need for
9473 the `PhantomFn` and `MarkerTrait` lang items, which have been
9475 * ["-" is no longer a valid character in crate names][cr], the `extern crate
9476 "foo" as bar` syntax has been replaced with `extern crate foo as
9477 bar`, and Cargo now automatically translates "-" in *package* names
9478 to underscore for the crate name.
9479 * [Lifetime shadowing is an error][lt].
9480 * [`Send` no longer implies `'static`][send-rfc].
9481 * [UFCS now supports trait-less associated paths][moar-ufcs] like
9482 `MyType::default()`.
9483 * Primitive types [now have inherent methods][prim-inherent],
9484 obviating the need for extension traits like `SliceExt`.
9485 * Methods with `Self: Sized` in their `where` clause are [considered
9486 object-safe][self-sized], allowing many extension traits like
9487 `IteratorExt` to be merged into the traits they extended.
9488 * You can now [refer to associated types][assoc-where] whose
9489 corresponding trait bounds appear only in a `where` clause.
9490 * The final bits of [OIBIT landed][oibit-final], meaning that traits
9491 like `Send` and `Sync` are now library-defined.
9492 * A [Reflect trait][reflect] was introduced, which means that
9493 downcasting via the `Any` trait is effectively limited to concrete
9494 types. This helps retain the potentially-important "parametricity"
9495 property: generic code cannot behave differently for different type
9496 arguments except in minor ways.
9497 * The `unsafe_destructor` feature is now deprecated in favor of the
9498 [new `dropck`][rfc769]. This change is a major reduction in unsafe
9504 * The `thread_local` module [has been renamed to `std::thread`][th].
9505 * The methods of `IteratorExt` [have been moved to the `Iterator`
9506 trait itself][23300].
9507 * Several traits that implement Rust's conventions for type
9508 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
9509 [centralized in the `std::convert` module][con].
9510 * The `FromError` trait [was removed in favor of `From`][fe].
9511 * The basic sleep function [has moved to
9512 `std::thread::sleep_ms`][slp].
9513 * The `splitn` function now takes an `n` parameter that represents the
9514 number of items yielded by the returned iterator [instead of the
9515 number of 'splits'][spl].
9516 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
9517 * [Derived implementations of `PartialOrd` now order enums according
9518 to their explicitly-assigned discriminants][po].
9519 * [Methods for searching strings are generic over `Pattern`s][pat],
9520 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
9522 * [In method resolution, object methods are resolved before inherent
9524 * [`String::from_str` has been deprecated in favor of the `From` impl,
9525 `String::from`][24517].
9526 * [`io::Error` implements `Sync`][ios].
9527 * [The `words` method on `&str` has been replaced with
9528 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
9530 * The new path and IO modules are complete and `#[stable]`. This
9531 was the major library focus for this cycle.
9532 * The path API was [revised][path-normalize] to normalize `.`,
9533 adjusting the tradeoffs in favor of the most common usage.
9534 * A large number of remaining APIs in `std` were also stabilized
9535 during this cycle; about 75% of the non-deprecated API surface
9537 * The new [string pattern API][string-pattern] landed, which makes
9538 the string slice API much more internally consistent and flexible.
9539 * A new set of [generic conversion traits][conversion] replaced
9540 many existing ad hoc traits.
9541 * Generic numeric traits were [completely removed][num-traits]. This
9542 was made possible thanks to inherent methods for primitive types,
9543 and the removal gives maximal flexibility for designing a numeric
9544 hierarchy in the future.
9545 * The `Fn` traits are now related via [inheritance][fn-inherit]
9546 and provide ergonomic [blanket implementations][fn-blanket].
9547 * The `Index` and `IndexMut` traits were changed to
9548 [take the index by value][index-value], enabling code like
9549 `hash_map["string"]` to work.
9550 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
9551 `Copy` data is known to be `Clone` as well.
9556 * Many errors now have extended explanations that can be accessed with
9557 the `--explain` flag to `rustc`.
9558 * Many new examples have been added to the standard library
9560 * rustdoc has received a number of improvements focused on completion
9562 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
9563 * Much headway was made on ecosystem-wide CI, making it possible
9564 to [compare builds for breakage][ci-compare].
9567 [crates.io]: http://crates.io
9568 [clo]: https://github.com/rust-lang/rust/pull/24034
9569 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
9570 [con]: https://github.com/rust-lang/rust/pull/23875
9571 [cr]: https://github.com/rust-lang/rust/pull/23419
9572 [fe]: https://github.com/rust-lang/rust/pull/23879
9573 [23300]: https://github.com/rust-lang/rust/pull/23300
9574 [inv]: https://github.com/rust-lang/rust/pull/23938
9575 [ios]: https://github.com/rust-lang/rust/pull/24133
9576 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
9577 [lt]: https://github.com/rust-lang/rust/pull/24057
9578 [meth]: https://github.com/rust-lang/rust/pull/24056
9579 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
9580 [po]: https://github.com/rust-lang/rust/pull/24270
9581 [24517]: https://github.com/rust-lang/rust/pull/24517
9582 [slp]: https://github.com/rust-lang/rust/pull/23949
9583 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
9584 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
9585 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
9586 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
9587 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
9588 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
9589 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
9590 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
9591 [self-sized]: https://github.com/rust-lang/rust/pull/22301
9592 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
9593 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
9594 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
9595 [reflect]: https://github.com/rust-lang/rust/pull/23712
9596 [conversion]: https://github.com/rust-lang/rfcs/pull/529
9597 [num-traits]: https://github.com/rust-lang/rust/pull/23549
9598 [index-value]: https://github.com/rust-lang/rust/pull/23601
9599 [rfc769]: https://github.com/rust-lang/rfcs/pull/769
9600 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
9601 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
9602 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
9603 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
9604 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
9607 Version 1.0.0-alpha.2 (2015-02-20)
9608 =====================================
9610 * ~1300 changes, numerous bugfixes
9614 * The various I/O modules were [overhauled][io-rfc] to reduce
9615 unnecessary abstractions and provide better interoperation with
9616 the underlying platform. The old `io` module remains temporarily
9618 * The standard library now [participates in feature gating][feat],
9619 so use of unstable libraries now requires a `#![feature(...)]`
9620 attribute. The impact of this change is [described on the
9621 forum][feat-forum]. [RFC][feat-rfc].
9625 * `for` loops [now operate on the `IntoIterator` trait][into],
9626 which eliminates the need to call `.iter()`, etc. to iterate
9627 over collections. There are some new subtleties to remember
9628 though regarding what sort of iterators various types yield, in
9629 particular that `for foo in bar { }` yields values from a move
9630 iterator, destroying the original collection. [RFC][into-rfc].
9631 * Objects now have [default lifetime bounds][obj], so you don't
9632 have to write `Box<Trait+'static>` when you don't care about
9633 storing references. [RFC][obj-rfc].
9634 * In types that implement `Drop`, [lifetimes must outlive the
9635 value][drop]. This will soon make it possible to safely
9636 implement `Drop` for types where `#[unsafe_destructor]` is now
9637 required. Read the [gorgeous RFC][drop-rfc] for details.
9638 * The fully qualified <T as Trait>::X syntax lets you set the Self
9639 type for a trait method or associated type. [RFC][ufcs-rfc].
9640 * References to types that implement `Deref<U>` now [automatically
9641 coerce to references][deref] to the dereferenced type `U`,
9642 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
9643 should eliminate many unsightly uses of `&*`, as when converting
9644 from references to vectors into references to
9645 slices. [RFC][deref-rfc].
9646 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
9647 `|:|`) is obsolete and closure kind is inferred from context.
9648 * [`Self` is a keyword][Self].
9652 * The `Show` and `String` formatting traits [have been
9653 renamed][fmt] to `Debug` and `Display` to more clearly reflect
9654 their related purposes. Automatically getting a string
9655 conversion to use with `format!("{:?}", something_to_debug)` is
9656 now written `#[derive(Debug)]`.
9657 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
9658 OsStr}`, provide strings in platform-specific encodings for easier
9659 interop with system APIs. [RFC][osstr-rfc].
9660 * The `boxed::into_raw` and `Box::from_raw` functions [convert
9661 between `Box<T>` and `*mut T`][boxraw], a common pattern for
9662 creating raw pointers.
9666 * Certain long error messages of the form 'expected foo found bar'
9667 are now [split neatly across multiple
9668 lines][multiline]. Examples in the PR.
9669 * On Unix Rust can be [uninstalled][un] by running
9670 `/usr/local/lib/rustlib/uninstall.sh`.
9671 * The `#[rustc_on_unimplemented]` attribute, requiring the
9672 'on_unimplemented' feature, lets rustc [display custom error
9673 messages when a trait is expected to be implemented for a type
9678 * Rust is tested against a [LALR grammar][lalr], which parses
9679 almost all the Rust files that rustc does.
9681 [boxraw]: https://github.com/rust-lang/rust/pull/21318
9682 [close]: https://github.com/rust-lang/rust/pull/21843
9683 [deref]: https://github.com/rust-lang/rust/pull/21351
9684 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
9685 [drop]: https://github.com/rust-lang/rust/pull/21972
9686 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
9687 [feat]: https://github.com/rust-lang/rust/pull/21248
9688 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
9689 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
9690 [fmt]: https://github.com/rust-lang/rust/pull/21457
9691 [into]: https://github.com/rust-lang/rust/pull/20790
9692 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
9693 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9694 [lalr]: https://github.com/rust-lang/rust/pull/21452
9695 [multiline]: https://github.com/rust-lang/rust/pull/19870
9696 [obj]: https://github.com/rust-lang/rust/pull/22230
9697 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
9698 [onun]: https://github.com/rust-lang/rust/pull/20889
9699 [osstr]: https://github.com/rust-lang/rust/pull/21488
9700 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
9701 [Self]: https://github.com/rust-lang/rust/pull/22158
9702 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
9703 [un]: https://github.com/rust-lang/rust/pull/22256
9706 Version 1.0.0-alpha (2015-01-09)
9707 ==================================
9709 * ~2400 changes, numerous bugfixes
9713 * The language itself is considered feature complete for 1.0,
9714 though there will be many usability improvements and bugfixes
9715 before the final release.
9716 * Nearly 50% of the public API surface of the standard library has
9717 been declared 'stable'. Those interfaces are unlikely to change
9719 * The long-running debate over integer types has been
9720 [settled][ints]: Rust will ship with types named `isize` and
9721 `usize`, rather than `int` and `uint`, for pointer-sized
9722 integers. Guidelines will be rolled out during the alpha cycle.
9723 * Most crates that are not `std` have been moved out of the Rust
9724 distribution into the Cargo ecosystem so they can evolve
9725 separately and don't need to be stabilized as quickly, including
9726 'time', 'getopts', 'num', 'regex', and 'term'.
9727 * Documentation continues to be expanded with more API coverage, more
9728 examples, and more in-depth explanations. The guides have been
9729 consolidated into [The Rust Programming Language][trpl].
9730 * "[Rust By Example][rbe]" is now maintained by the Rust team.
9731 * All official Rust binary installers now come with [Cargo], the
9732 Rust package manager.
9736 * Closures have been [completely redesigned][unboxed] to be
9737 implemented in terms of traits, can now be used as generic type
9738 bounds and thus monomorphized and inlined, or via an opaque
9739 pointer (boxed) as in the old system. The new system is often
9740 referred to as 'unboxed' closures.
9741 * Traits now support [associated types][assoc], allowing families
9742 of related types to be defined together and used generically in
9744 * Enum variants are [namespaced by their type names][enum].
9745 * [`where` clauses][where] provide a more versatile and attractive
9746 syntax for specifying generic bounds, though the previous syntax
9748 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
9750 * Rust [no longer has a runtime][rt] of any description, and only
9751 supports OS threads, not green threads.
9752 * At long last, Rust has been overhauled for 'dynamically-sized
9753 types' ([DST]), which integrates 'fat pointers' (object types,
9754 arrays, and `str`) more deeply into the type system, making it
9756 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
9757 `..j` that produce range types and which, when combined with the
9758 `Index` operator and multidispatch, leads to a convenient slice
9760 * The new range syntax revealed an ambiguity in the fixed-length
9761 array syntax, so now fixed length arrays [are written `[T;
9763 * The `Copy` trait is no longer implemented automatically. Unsafe
9764 pointers no longer implement `Sync` and `Send` so types
9765 containing them don't automatically either. `Sync` and `Send`
9766 are now 'unsafe traits' so one can "forcibly" implement them via
9767 `unsafe impl` if a type confirms to the requirements for them
9768 even though the internals do not (e.g. structs containing unsafe
9769 pointers like `Arc`). These changes are intended to prevent some
9770 footguns and are collectively known as [opt-in built-in
9771 traits][oibit] (though `Sync` and `Send` will soon become pure
9772 library types unknown to the compiler).
9773 * Operator traits now take their operands [by value][ops], and
9774 comparison traits can use multidispatch to compare one type
9775 against multiple other types, allowing e.g. `String` to be
9776 compared with `&str`.
9777 * `if let` and `while let` are no longer feature-gated.
9778 * Rust has adopted a more [uniform syntax for escaping unicode
9779 characters][unicode].
9780 * `macro_rules!` [has been declared stable][mac]. Though it is a
9781 flawed system it is sufficiently popular that it must be usable
9782 for 1.0. Effort has gone into [future-proofing][mac-future] it
9783 in ways that will allow other macro systems to be developed in
9784 parallel, and won't otherwise impact the evolution of the
9786 * The prelude has been [pared back significantly][prelude] such
9787 that it is the minimum necessary to support the most pervasive
9788 code patterns, and through [generalized where clauses][where]
9789 many of the prelude extension traits have been consolidated.
9790 * Rust's rudimentary reflection [has been removed][refl], as it
9791 incurred too much code generation for little benefit.
9792 * [Struct variants][structvars] are no longer feature-gated.
9793 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
9794 known as 'higher-ranked trait bounds', this crucially allows
9795 unboxed closures to work.
9796 * Macros invocations surrounded by parens or square brackets and
9797 not terminated by a semicolon are [parsed as
9798 expressions][macros], which makes expressions like `vec![1i32,
9799 2, 3].len()` work as expected.
9800 * Trait objects now implement their traits automatically, and
9801 traits that can be coerced to objects now must be [object
9803 * Automatically deriving traits is now done with `#[derive(...)]`
9804 not `#[deriving(...)]` for [consistency with other naming
9805 conventions][derive].
9806 * Importing the containing module or enum at the same time as
9807 items or variants they contain is [now done with `self` instead
9808 of `mod`][self], as in use `foo::{self, bar}`
9809 * Glob imports are no longer feature-gated.
9810 * The `box` operator and `box` patterns have been feature-gated
9811 pending a redesign. For now unique boxes should be allocated
9812 like other containers, with `Box::new`.
9816 * A [series][coll1] of [efforts][coll2] to establish
9817 [conventions][coll3] for collections types has resulted in API
9818 improvements throughout the standard library.
9819 * New [APIs for error handling][err] provide ergonomic interop
9820 between error types, and [new conventions][err-conv] describe
9821 more clearly the recommended error handling strategies in Rust.
9822 * The `fail!` macro has been renamed to [`panic!`][panic] so that
9823 it is easier to discuss failure in the context of error handling
9824 without making clarifications as to whether you are referring to
9825 the 'fail' macro or failure more generally.
9826 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
9827 syscall when available.
9828 * The 'serialize' crate has been renamed 'rustc-serialize' and
9829 moved out of the distribution to Cargo. Although it is widely
9830 used now, it is expected to be superseded in the near future.
9831 * The `Show` formatter, typically implemented with
9832 `#[derive(Show)]` is [now requested with the `{:?}`
9833 specifier][show] and is intended for use by all types, for uses
9834 such as `println!` debugging. The new `String` formatter must be
9835 implemented by hand, uses the `{}` specifier, and is intended
9836 for full-fidelity conversions of things that can logically be
9837 represented as strings.
9841 * [Flexible target specification][flex] allows rustc's code
9842 generation to be configured to support otherwise-unsupported
9844 * Rust comes with rust-gdb and rust-lldb scripts that launch their
9845 respective debuggers with Rust-appropriate pretty-printing.
9846 * The Windows installation of Rust is distributed with the
9847 MinGW components currently required to link binaries on that
9852 * Nullable enum optimizations have been extended to more types so
9853 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
9854 space than the inner types themselves.
9855 * Work has begun on supporting AArch64.
9857 [Cargo]: https://crates.io
9858 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
9859 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
9860 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
9861 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
9862 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
9863 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
9864 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
9865 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
9866 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
9867 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
9868 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
9869 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
9870 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
9871 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
9872 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
9873 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
9874 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
9875 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
9876 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
9877 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
9878 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
9879 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
9880 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
9881 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
9882 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
9883 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
9884 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
9885 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
9886 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
9887 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
9888 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
9889 [trpl]: https://doc.rust-lang.org/book/index.html
9890 [rbe]: http://rustbyexample.com/
9893 Version 0.12.0 (2014-10-09)
9894 =============================
9896 * ~1900 changes, numerous bugfixes
9900 * The introductory documentation (now called The Rust Guide) has
9901 been completely rewritten, as have a number of supplementary
9903 * Rust's package manager, Cargo, continues to improve and is
9904 sometimes considered to be quite awesome.
9905 * Many API's in `std` have been reviewed and updated for
9906 consistency with the in-development Rust coding
9907 guidelines. The standard library documentation tracks
9908 stabilization progress.
9909 * Minor libraries have been moved out-of-tree to the rust-lang org
9910 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
9911 be installed with Cargo.
9912 * Lifetime elision allows lifetime annotations to be left off of
9913 function declarations in many common scenarios.
9914 * Rust now works on 64-bit Windows.
9917 * Indexing can be overloaded with the `Index` and `IndexMut`
9919 * The `if let` construct takes a branch only if the `let` pattern
9920 matches, currently behind the 'if_let' feature gate.
9921 * 'where clauses', a more flexible syntax for specifying trait
9922 bounds that is more aesthetic, have been added for traits and
9923 free functions. Where clauses will in the future make it
9924 possible to constrain associated types, which would be
9925 impossible with the existing syntax.
9926 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
9927 the 'slicing_syntax' feature gate, and can be overloaded with
9928 the `Slice` or `SliceMut` traits.
9929 * The syntax for matching of sub-slices has been changed to use a
9930 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
9931 consistency with other uses of `..` and to future-proof
9932 potential additional uses of the syntax.
9933 * The syntax for matching inclusive ranges in patterns has changed
9934 from `0..3` to `0...4` to be consistent with the exclusive range
9936 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
9937 c]`) has been put behind the 'advanced_slice_patterns' feature
9938 gate and may be removed in the future.
9939 * Components of tuples and tuple structs can be extracted using
9940 the `value.0` syntax, currently behind the `tuple_indexing`
9942 * The `#[crate_id]` attribute is no longer supported; versioning
9943 is handled by the package manager.
9944 * Renaming crate imports are now written `extern crate foo as bar`
9945 instead of `extern crate bar = foo`.
9946 * Renaming use statements are now written `use foo as bar` instead
9948 * `let` and `match` bindings and argument names in macros are now
9950 * The new, more efficient, closure types ('unboxed closures') have
9951 been added under a feature gate, 'unboxed_closures'. These will
9952 soon replace the existing closure types, once higher-ranked
9953 trait lifetimes are added to the language.
9954 * `move` has been added as a keyword, for indicating closures
9955 that capture by value.
9956 * Mutation and assignment is no longer allowed in pattern guards.
9957 * Generic structs and enums can now have trait bounds.
9958 * The `Share` trait is now called `Sync` to free up the term
9959 'shared' to refer to 'shared reference' (the default reference
9961 * Dynamically-sized types have been mostly implemented,
9962 unifying the behavior of fat-pointer types with the rest of the
9964 * As part of dynamically-sized types, the `Sized` trait has been
9965 introduced, which qualifying types implement by default, and
9966 which type parameters expect by default. To specify that a type
9967 parameter does not need to be sized, write `<Sized? T>`. Most
9968 types are `Sized`, notable exceptions being unsized arrays
9969 (`[T]`) and trait types.
9970 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
9971 * Lifetime bounds can now be applied to type parameters and object
9973 * The old, reference counted GC type, `Gc<T>` which was once
9974 denoted by the `@` sigil, has finally been removed. GC will be
9975 revisited in the future.
9978 * Library documentation has been improved for a number of modules.
9979 * Bit-vectors, collections::bitv has been modernized.
9980 * The url crate is deprecated in favor of
9981 http://github.com/servo/rust-url, which can be installed with
9983 * Most I/O stream types can be cloned and subsequently closed from
9985 * A `std::time::Duration` type has been added for use in I/O
9986 methods that rely on timers, as well as in the 'time' crate's
9987 `Timespec` arithmetic.
9988 * The runtime I/O abstraction layer that enabled the green thread
9989 scheduler to do non-thread-blocking I/O has been removed, along
9990 with the libuv-based implementation employed by the green thread
9991 scheduler. This will greatly simplify the future I/O work.
9992 * `collections::btree` has been rewritten to have a more
9993 idiomatic and efficient design.
9996 * rustdoc output now indicates the stability levels of API's.
9997 * The `--crate-name` flag can specify the name of the crate
9998 being compiled, like `#[crate_name]`.
9999 * The `-C metadata` specifies additional metadata to hash into
10000 symbol names, and `-C extra-filename` specifies additional
10001 information to put into the output filename, for use by the
10002 package manager for versioning.
10003 * debug info generation has continued to improve and should be
10004 more reliable under both gdb and lldb.
10005 * rustc has experimental support for compiling in parallel
10006 using the `-C codegen-units` flag.
10007 * rustc no longer encodes rpath information into binaries by
10011 * Stack usage has been optimized with LLVM lifetime annotations.
10012 * Official Rust binaries on Linux are more compatible with older
10013 kernels and distributions, built on CentOS 5.10.
10016 Version 0.11.0 (2014-07-02)
10017 ==========================
10019 * ~1700 changes, numerous bugfixes
10022 * ~[T] has been removed from the language. This type is superseded by
10024 * ~str has been removed from the language. This type is superseded by
10026 * ~T has been removed from the language. This type is superseded by the
10028 * @T has been removed from the language. This type is superseded by the
10029 standard library's std::gc::Gc<T> type.
10030 * Struct fields are now all private by default.
10031 * Vector indices and shift amounts are both required to be a `uint`
10032 instead of any integral type.
10033 * Byte character, byte string, and raw byte string literals are now all
10034 supported by prefixing the normal literal with a `b`.
10035 * Multiple ABIs are no longer allowed in an ABI string
10036 * The syntax for lifetimes on closures/procedures has been tweaked
10037 slightly: `<'a>|A, B|: 'b + K -> T`
10038 * Floating point modulus has been removed from the language; however it
10039 is still provided by a library implementation.
10040 * Private enum variants are now disallowed.
10041 * The `priv` keyword has been removed from the language.
10042 * A closure can no longer be invoked through a &-pointer.
10043 * The `use foo, bar, baz;` syntax has been removed from the language.
10044 * The transmute intrinsic no longer works on type parameters.
10045 * Statics now allow blocks/items in their definition.
10046 * Trait bounds are separated from objects with + instead of : now.
10047 * Objects can no longer be read while they are mutably borrowed.
10048 * The address of a static is now marked as insignificant unless the
10049 #[inline(never)] attribute is placed it.
10050 * The #[unsafe_destructor] attribute is now behind a feature gate.
10051 * Struct literals are no longer allowed in ambiguous positions such as
10052 if, while, match, and for..in.
10053 * Declaration of lang items and intrinsics are now feature-gated by
10055 * Integral literals no longer default to `int`, and floating point
10056 literals no longer default to `f64`. Literals must be suffixed with an
10057 appropriate type if inference cannot determine the type of the
10059 * The Box<T> type is no longer implicitly borrowed to &mut T.
10060 * Procedures are now required to not capture borrowed references.
10063 * The standard library is now a "facade" over a number of underlying
10064 libraries. This means that development on the standard library should
10065 be speedier due to smaller crates, as well as a clearer line between
10067 * A new library, libcore, lives under the standard library's facade
10068 which is Rust's "0-assumption" library, suitable for embedded and
10069 kernel development for example.
10070 * A regex crate has been added to the standard distribution. This crate
10071 includes statically compiled regular expressions.
10072 * The unwrap/unwrap_err methods on Result require a Show bound for
10073 better error messages.
10074 * The return types of the std::comm primitives have been centralized
10075 around the Result type.
10076 * A number of I/O primitives have gained the ability to time out their
10078 * A number of I/O primitives have gained the ability to close their
10079 reading/writing halves to cancel pending operations.
10080 * Reverse iterator methods have been removed in favor of `rev()` on
10081 their forward-iteration counterparts.
10082 * A bitflags! macro has been added to enable easy interop with C and
10083 management of bit flags.
10084 * A debug_assert! macro is now provided which is disabled when
10085 `--cfg ndebug` is passed to the compiler.
10086 * A graphviz crate has been added for creating .dot files.
10087 * The std::cast module has been migrated into std::mem.
10088 * The std::local_data api has been migrated from freestanding functions
10089 to being based on methods.
10090 * The Pod trait has been renamed to Copy.
10091 * jemalloc has been added as the default allocator for types.
10092 * The API for allocating memory has been changed to use proper alignment
10093 and sized deallocation
10094 * Connecting a TcpStream or binding a TcpListener is now based on a
10095 string address and a u16 port. This allows connecting to a hostname as
10097 * The Reader trait now contains a core method, read_at_least(), which
10098 correctly handles many repeated 0-length reads.
10099 * The process-spawning API is now centered around a builder-style
10101 * The :? printing qualifier has been moved from the standard library to
10102 an external libdebug crate.
10103 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
10104 have been renamed to Eq/Ord.
10105 * The select/plural methods have been removed from format!. The escapes
10106 for { and } have also changed from \{ and \} to {{ and }},
10108 * The TaskBuilder API has been re-worked to be a true builder, and
10109 extension traits for spawning native/green tasks have been added.
10112 * All breaking changes to the language or libraries now have their
10113 commit message annotated with `[breaking-change]` to allow for easy
10114 discovery of breaking changes.
10115 * The compiler will now try to suggest how to annotate lifetimes if a
10116 lifetime-related error occurs.
10117 * Debug info continues to be improved greatly with general bug fixes and
10118 better support for situations like link time optimization (LTO).
10119 * Usage of syntax extensions when cross-compiling has been fixed.
10120 * Functionality equivalent to GCC & Clang's -ffunction-sections,
10121 -fdata-sections and --gc-sections has been enabled by default
10122 * The compiler is now stricter about where it will load module files
10123 from when a module is declared via `mod foo;`.
10124 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
10125 Syntax extensions are now discovered via a "plugin registrar" type
10126 which will be extended in the future to other various plugins.
10127 * Lints have been restructured to allow for dynamically loadable lints.
10128 * A number of rustdoc improvements:
10129 * The HTML output has been visually redesigned.
10130 * Markdown is now powered by hoedown instead of sundown.
10131 * Searching heuristics have been greatly improved.
10132 * The search index has been reduced in size by a great amount.
10133 * Cross-crate documentation via `pub use` has been greatly improved.
10134 * Primitive types are now hyperlinked and documented.
10135 * Documentation has been moved from static.rust-lang.org/doc to
10137 * A new sandbox, play.rust-lang.org, is available for running and
10138 sharing rust code examples on-line.
10139 * Unused attributes are now more robustly warned about.
10140 * The dead_code lint now warns about unused struct fields.
10141 * Cross-compiling to iOS is now supported.
10142 * Cross-compiling to mipsel is now supported.
10143 * Stability attributes are now inherited by default and no longer apply
10144 to intra-crate usage, only inter-crate usage.
10145 * Error message related to non-exhaustive match expressions have been
10149 Version 0.10 (2014-04-03)
10150 =========================
10152 * ~1500 changes, numerous bugfixes
10155 * A new RFC process is now in place for modifying the language.
10156 * Patterns with `@`-pointers have been removed from the language.
10157 * Patterns with unique vectors (`~[T]`) have been removed from the
10159 * Patterns with unique strings (`~str`) have been removed from the
10161 * `@str` has been removed from the language.
10162 * `@[T]` has been removed from the language.
10163 * `@self` has been removed from the language.
10164 * `@Trait` has been removed from the language.
10165 * Headers on `~` allocations which contain `@` boxes inside the type for
10166 reference counting have been removed.
10167 * The semantics around the lifetimes of temporary expressions have changed,
10168 see #3511 and #11585 for more information.
10169 * Cross-crate syntax extensions are now possible, but feature gated. See
10170 #11151 for more information. This includes both `macro_rules!` macros as
10171 well as syntax extensions such as `format!`.
10172 * New lint modes have been added, and older ones have been turned on to be
10174 * Unnecessary parentheses
10175 * Uppercase statics
10177 * Uppercase variables
10178 * Publicly visible private types
10179 * `#[deriving]` with raw pointers
10180 * Unsafe functions can no longer be coerced to closures.
10181 * Various obscure macros such as `log_syntax!` are now behind feature gates.
10182 * The `#[simd]` attribute is now behind a feature gate.
10183 * Visibility is no longer allowed on `extern crate` statements, and
10184 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
10185 * Trailing commas are now allowed in argument lists and tuple patterns.
10186 * The `do` keyword has been removed, it is now a reserved keyword.
10187 * Default type parameters have been implemented, but are feature gated.
10188 * Borrowed variables through captures in closures are now considered soundly.
10189 * `extern mod` is now `extern crate`
10190 * The `Freeze` trait has been removed.
10191 * The `Share` trait has been added for types that can be shared among
10193 * Labels in macros are now hygienic.
10194 * Expression/statement macro invocations can be delimited with `{}` now.
10195 * Treatment of types allowed in `static mut` locations has been tweaked.
10196 * The `*` and `.` operators are now overloadable through the `Deref` and
10198 * `~Trait` and `proc` no longer have `Send` bounds by default.
10199 * Partial type hints are now supported with the `_` type marker.
10200 * An `Unsafe` type was introduced for interior mutability. It is now
10201 considered undefined to transmute from `&T` to `&mut T` without using the
10203 * The #[linkage] attribute was implemented for extern statics/functions.
10204 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
10205 * `Pod` was renamed to `Copy`.
10208 * The `libextra` library has been removed. It has now been decomposed into
10209 component libraries with smaller and more focused nuggets of
10210 functionality. The full list of libraries can be found on the
10211 documentation index page.
10212 * std: `std::condition` has been removed. All I/O errors are now propagated
10213 through the `Result` type. In order to assist with error handling, a
10214 `try!` macro for unwrapping errors with an early return and a lint for
10215 unused results has been added. See #12039 for more information.
10216 * std: The `vec` module has been renamed to `slice`.
10217 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
10218 This will become the only growable vector in the future.
10219 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
10220 are now found at `std::io::BufferedReader` instead of
10221 `std::io::buffered::BufferedReader`.
10222 * std: `print` and `println` are no longer in the prelude, the `print!` and
10223 `println!` macros are intended to be used instead.
10224 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
10225 attempts to statically prevent cycles.
10226 * std: The standard distribution is adopting the policy of pushing failure
10227 to the user rather than failing in libraries. Many functions (such as
10228 `slice::last()`) now return `Option<T>` instead of `T` + failing.
10229 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
10230 deriving mode: `#[deriving(Show)]`.
10231 * std: `ToStr` is now implemented for all types implementing `Show`.
10232 * std: The formatting trait methods now take `&self` instead of `&T`
10233 * std: The `invert()` method on iterators has been renamed to `rev()`
10234 * std: `std::num` has seen a reduction in the genericity of its traits,
10235 consolidating functionality into a few core traits.
10236 * std: Backtraces are now printed on task failure if the environment
10237 variable `RUST_BACKTRACE` is present.
10238 * std: Naming conventions for iterators have been standardized. More details
10239 can be found on the wiki's style guide.
10240 * std: `eof()` has been removed from the `Reader` trait. Specific types may
10241 still implement the function.
10242 * std: Networking types are now cloneable to allow simultaneous reads/writes.
10243 * std: `assert_approx_eq!` has been removed
10244 * std: The `e` and `E` formatting specifiers for floats have been added to
10245 print them in exponential notation.
10246 * std: The `Times` trait has been removed
10247 * std: Indications of variance and opting out of builtin bounds is done
10248 through marker types in `std::kinds::marker` now
10249 * std: `hash` has been rewritten, `IterBytes` has been removed, and
10250 `#[deriving(Hash)]` is now possible.
10251 * std: `SharedChan` has been removed, `Sender` is now cloneable.
10252 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
10253 * std: `Chan::new` is now `channel()`.
10254 * std: A new synchronous channel type has been implemented.
10255 * std: A `select!` macro is now provided for selecting over `Receiver`s.
10256 * std: `hashmap` and `trie` have been moved to `libcollections`
10257 * std: `run` has been rolled into `io::process`
10258 * std: `assert_eq!` now uses `{}` instead of `{:?}`
10259 * std: The equality and comparison traits have seen some reorganization.
10260 * std: `rand` has moved to `librand`.
10261 * std: `to_{lower,upper}case` has been implemented for `char`.
10262 * std: Logging has been moved to `liblog`.
10263 * collections: `HashMap` has been rewritten for higher performance and less
10265 * native: The default runtime is now `libnative`. If `libgreen` is desired,
10266 it can be booted manually. The runtime guide has more information and
10268 * native: All I/O functionality except signals has been implemented.
10269 * green: Task spawning with `libgreen` has been optimized with stack caching
10270 and various trimming of code.
10271 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
10272 * sync: The `extra::sync` module has been updated to modern rust (and moved
10273 to the `sync` library), tweaking and improving various interfaces while
10274 dropping redundant functionality.
10275 * sync: A new `Barrier` type has been added to the `sync` library.
10276 * sync: An efficient mutex for native and green tasks has been implemented.
10277 * serialize: The `base64` module has seen some improvement. It treats
10278 newlines better, has non-string error values, and has seen general
10280 * fourcc: A `fourcc!` macro was introduced
10281 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
10282 hexadecimal literal.
10285 * `rustpkg` has been deprecated and removed from the main repository. Its
10286 replacement, `cargo`, is under development.
10287 * Nightly builds of rust are now available
10288 * The memory usage of rustc has been improved many times throughout this
10290 * The build process supports disabling rpath support for the rustc binary
10292 * Code generation has improved in some cases, giving more information to the
10293 LLVM optimization passes to enable more extensive optimizations.
10294 * Debuginfo compatibility with lldb on OSX has been restored.
10295 * The master branch is now gated on an android bot, making building for
10296 android much more reliable.
10297 * Output flags have been centralized into one `--emit` flag.
10298 * Crate type flags have been centralized into one `--crate-type` flag.
10299 * Codegen flags have been consolidated behind a `-C` flag.
10300 * Linking against outdated crates now has improved error messages.
10301 * Error messages with lifetimes will often suggest how to annotate the
10302 function to fix the error.
10303 * Many more types are documented in the standard library, and new guides
10305 * Many `rustdoc` improvements:
10306 * code blocks are syntax highlighted.
10307 * render standalone markdown files.
10308 * the --test flag tests all code blocks by default.
10309 * exported macros are displayed.
10310 * re-exported types have their documentation inlined at the location of the
10312 * search works across crates that have been rendered to the same output
10316 Version 0.9 (2014-01-09)
10317 ==========================
10319 * ~1800 changes, numerous bugfixes
10322 * The `float` type has been removed. Use `f32` or `f64` instead.
10323 * A new facility for enabling experimental features (feature gating) has
10324 been added, using the crate-level `#[feature(foo)]` attribute.
10325 * Managed boxes (@) are now behind a feature gate
10326 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
10327 standard library's `Gc` or `Rc` types instead.
10328 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
10329 * Jumping back to the top of a loop is now done with `continue` instead of
10331 * Strings can no longer be mutated through index assignment.
10332 * Raw strings can be created via the basic `r"foo"` syntax or with matched
10333 hash delimiters, as in `r###"foo"###`.
10334 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
10336 * The `&fn` type is now written `|args| -> ret` to match the literal form.
10337 * `@fn`s have been removed.
10338 * `do` only works with procs in order to make it obvious what the cost
10340 * Single-element tuple-like structs can no longer be dereferenced to
10341 obtain the inner value. A more comprehensive solution for overloading
10342 the dereference operator will be provided in the future.
10343 * The `#[link(...)]` attribute has been replaced with
10344 `#[crate_id = "name#vers"]`.
10345 * Empty `impl`s must be terminated with empty braces and may not be
10346 terminated with a semicolon.
10347 * Keywords are no longer allowed as lifetime names; the `self` lifetime
10348 no longer has any special meaning.
10349 * The old `fmt!` string formatting macro has been removed.
10350 * `printf!` and `printfln!` (old-style formatting) removed in favor of
10351 `print!` and `println!`.
10352 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
10353 * The `extern mod foo (name = "bar")` syntax has been removed. Use
10354 `extern mod foo = "bar"` instead.
10355 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
10356 * Macros can have attributes.
10357 * Macros can expand to items with attributes.
10358 * Macros can expand to multiple items.
10359 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
10360 * Comments may be nested.
10361 * Values automatically coerce to trait objects they implement, without
10363 * Enum discriminants are no longer an entire word but as small as needed to
10364 contain all the variants. The `repr` attribute can be used to override
10365 the discriminant size, as in `#[repr(int)]` for integer-sized, and
10366 `#[repr(C)]` to match C enums.
10367 * Non-string literals are not allowed in attributes (they never worked).
10368 * The FFI now supports variadic functions.
10369 * Octal numeric literals, as in `0o7777`.
10370 * The `concat!` syntax extension performs compile-time string concatenation.
10371 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
10372 removed as Rust no longer uses segmented stacks.
10373 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
10374 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
10375 not `*`; ignoring remaining fields of a struct is also done with `..`,
10376 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
10377 * `rustc` supports the "win64" calling convention via `extern "win64"`.
10378 * `rustc` supports the "system" calling convention, which defaults to the
10379 preferred convention for the target platform, "stdcall" on 32-bit Windows,
10381 * The `type_overflow` lint (default: warn) checks literals for overflow.
10382 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
10383 * The `attribute_usage` lint (default: warn) warns about unknown
10385 * The `unknown_features` lint (default: warn) warns about unknown
10387 * The `dead_code` lint (default: warn) checks for dead code.
10388 * Rust libraries can be linked statically to one another
10389 * `#[link_args]` is behind the `link_args` feature gate.
10390 * Native libraries are now linked with `#[link(name = "foo")]`
10391 * Native libraries can be statically linked to a rust crate
10392 (`#[link(name = "foo", kind = "static")]`).
10393 * Native OS X frameworks are now officially supported
10394 (`#[link(name = "foo", kind = "framework")]`).
10395 * The `#[thread_local]` attribute creates thread-local (not task-local)
10396 variables. Currently behind the `thread_local` feature gate.
10397 * The `return` keyword may be used in closures.
10398 * Types that can be copied via a memcpy implement the `Pod` kind.
10399 * The `cfg` attribute can now be used on struct fields and enum variants.
10402 * std: The `option` and `result` API's have been overhauled to make them
10403 simpler, more consistent, and more composable.
10404 * std: The entire `std::io` module has been replaced with one that is
10405 more comprehensive and that properly interfaces with the underlying
10406 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
10408 * std: `io::util` contains a number of useful implementations of
10409 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
10410 `ZeroReader`, `TeeReader`.
10411 * std: The reference counted pointer type `extra::rc` moved into std.
10412 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
10413 just a wrapper around it).
10414 * std: The `Either` type has been removed.
10415 * std: `fmt::Default` can be implemented for any type to provide default
10416 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
10417 * std: The `rand` API continues to be tweaked.
10418 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
10419 on failure in gdb, is now named `rust_fail`.
10420 * std: The `each_key` and `each_value` methods on `HashMap` have been
10421 replaced by the `keys` and `values` iterators.
10422 * std: Functions dealing with type size and alignment have moved from the
10423 `sys` module to the `mem` module.
10424 * std: The `path` module was written and API changed.
10425 * std: `str::from_utf8` has been changed to cast instead of allocate.
10426 * std: `starts_with` and `ends_with` methods added to vectors via the
10427 `ImmutableEqVector` trait, which is in the prelude.
10428 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
10429 if the index is out of bounds.
10430 * std: Task failure no longer propagates between tasks, as the model was
10431 complex, expensive, and incompatible with thread-based tasks.
10432 * std: The `Any` type can be used for dynamic typing.
10433 * std: `~Any` can be passed to the `fail!` macro and retrieved via
10435 * std: Methods that produce iterators generally do not have an `_iter`
10437 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
10438 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
10439 * std: `util::ignore` renamed to `prelude::drop`.
10440 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
10442 * std: `vec::raw` has seen a lot of cleanup and API changes.
10443 * std: The standard library no longer includes any C++ code, and very
10444 minimal C, eliminating the dependency on libstdc++.
10445 * std: Runtime scheduling and I/O functionality has been factored out into
10446 extensible interfaces and is now implemented by two different crates:
10447 libnative, for native threading and I/O; and libgreen, for green threading
10448 and I/O. This paves the way for using the standard library in more limited
10449 embedded environments.
10450 * std: The `comm` module has been rewritten to be much faster, have a
10451 simpler, more consistent API, and to work for both native and green
10453 * std: All libuv dependencies have been moved into the rustuv crate.
10454 * native: New implementations of runtime scheduling on top of OS threads.
10455 * native: New native implementations of TCP, UDP, file I/O, process spawning,
10457 * green: The green thread scheduler and message passing types are almost
10458 entirely lock-free.
10459 * extra: The `flatpipes` module had bitrotted and was removed.
10460 * extra: All crypto functions have been removed and Rust now has a policy of
10461 not reimplementing crypto in the standard library. In the future crypto
10462 will be provided by external crates with bindings to established libraries.
10463 * extra: `c_vec` has been modernized.
10464 * extra: The `sort` module has been removed. Use the `sort` method on
10468 * The `rust` and `rusti` commands have been removed, due to lack of
10470 * `rustdoc` was completely rewritten.
10471 * `rustdoc` can test code examples in documentation.
10472 * `rustpkg` can test packages with the argument, 'test'.
10473 * `rustpkg` supports arbitrary dependencies, including C libraries.
10474 * `rustc`'s support for generating debug info is improved again.
10475 * `rustc` has better error reporting for unbalanced delimiters.
10476 * `rustc`'s JIT support was removed due to bitrot.
10477 * Executables and static libraries can be built with LTO (-Z lto)
10478 * `rustc` adds a `--dep-info` flag for communicating dependencies to
10482 Version 0.8 (2013-09-26)
10483 ============================
10485 * ~2200 changes, numerous bugfixes
10488 * The `for` loop syntax has changed to work with the `Iterator` trait.
10489 * At long last, unwinding works on Windows.
10490 * Default methods are ready for use.
10491 * Many trait inheritance bugs fixed.
10492 * Owned and borrowed trait objects work more reliably.
10493 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
10494 * rustc can omit emission of code for the `debug!` macro if it is passed
10496 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
10497 for foo.rs, then foo/mod.rs, and will generate an error when both are
10499 * Strings no longer contain trailing nulls. The new `std::c_str` module
10500 provides new mechanisms for converting to C strings.
10501 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
10502 * The FFI has been overhauled such that foreign functions are called directly,
10503 instead of through a stack-switching wrapper.
10504 * Calling a foreign function must be done through a Rust function with the
10505 `#[fixed_stack_segment]` attribute.
10506 * The `externfn!` macro can be used to declare both a foreign function and
10507 a `#[fixed_stack_segment]` wrapper at once.
10508 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
10509 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
10510 * `priv` is disallowed everywhere except for struct fields and enum variants.
10511 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
10512 * `ref` bindings in irrefutable patterns work correctly now.
10513 * `char` is now prevented from containing invalid code points.
10514 * Casting to `bool` is no longer allowed.
10515 * `\0` is now accepted as an escape in chars and strings.
10516 * `yield` is a reserved keyword.
10517 * `typeof` is a reserved keyword.
10518 * Crates may be imported by URL with `extern mod foo = "url";`.
10519 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
10520 * Static vectors can be initialized with repeating elements,
10521 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
10522 * Static structs can be initialized with functional record update,
10523 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
10524 * `cfg!` can be used to conditionally execute code based on the crate
10525 configuration, similarly to `#[cfg(...)]`.
10526 * The `unnecessary_qualification` lint detects unneeded module
10527 prefixes (default: allow).
10528 * Arithmetic operations have been implemented on the SIMD types in
10529 `std::unstable::simd`.
10530 * Exchange allocation headers were removed, reducing memory usage.
10531 * `format!` implements a completely new, extensible, and higher-performance
10532 string formatting system. It will replace `fmt!`.
10533 * `print!` and `println!` write formatted strings (using the `format!`
10534 extension) to stdout.
10535 * `write!` and `writeln!` write formatted strings (using the `format!`
10536 extension) to the new Writers in `std::rt::io`.
10537 * The library section in which a function or static is placed may
10538 be specified with `#[link_section = "..."]`.
10539 * The `proto!` syntax extension for defining bounded message protocols
10541 * `macro_rules!` is hygienic for `let` declarations.
10542 * The `#[export_name]` attribute specifies the name of a symbol.
10543 * `unreachable!` can be used to indicate unreachable code, and fails
10547 * std: Transitioned to the new runtime, written in Rust.
10548 * std: Added an experimental I/O library, `rt::io`, based on the new
10550 * std: A new generic `range` function was added to the prelude, replacing
10551 `uint::range` and friends.
10552 * std: `range_rev` no longer exists. Since range is an iterator it can be
10553 reversed with `range(lo, hi).invert()`.
10554 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
10555 renamed to `unwrap_or`.
10556 * std: The `iterator` module was renamed to `iter`.
10557 * std: Integral types now support the `checked_add`, `checked_sub`, and
10558 `checked_mul` operations for detecting overflow.
10559 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
10561 * std: Methods are standardizing on conventions for casting methods:
10562 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
10564 * std: The `CString` type in `c_str` provides new ways to convert to and
10566 * std: `DoubleEndedIterator` can yield elements in two directions.
10567 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
10569 * std: `str::from_bytes` renamed to `str::from_utf8`.
10570 * std: `pop_opt` and `shift_opt` methods added to vectors.
10571 * std: The task-local data interface no longer uses @, and keys are
10572 no longer function pointers.
10573 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
10574 * std: Added `SharedPort` to `comm`.
10575 * std: `Eq` has a default method for `ne`; only `eq` is required
10576 in implementations.
10577 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
10578 is required in implementations.
10579 * std: `is_utf8` performance is improved, impacting many string functions.
10580 * std: `os::MemoryMap` provides cross-platform mmap.
10581 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
10582 are not 'in-bounds' are considered undefined.
10583 * std: Many freestanding functions in `vec` removed in favor of methods.
10584 * std: Many freestanding functions on scalar types removed in favor of
10586 * std: Many options to task builders were removed since they don't make
10587 sense in the new scheduler design.
10588 * std: More containers implement `FromIterator` so can be created by the
10590 * std: More complete atomic types in `unstable::atomics`.
10591 * std: `comm::PortSet` removed.
10592 * std: Mutating methods in the `Set` and `Map` traits have been moved into
10593 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
10594 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
10595 default implementations.
10596 * std: Various `from_str` functions were removed in favor of a generic
10597 `from_str` which is available in the prelude.
10598 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
10599 * extra: `dlist`, the doubly-linked list was modernized.
10600 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
10601 * extra: Added `glob` module, replacing `std::os::glob`.
10602 * extra: `rope` was removed.
10603 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
10604 * extra: `net`, and `timer` were removed. The experimental replacements
10605 are `std::rt::io::net` and `std::rt::io::timer`.
10606 * extra: Iterators implemented for `SmallIntMap`.
10607 * extra: Iterators implemented for `Bitv` and `BitvSet`.
10608 * extra: `SmallIntSet` removed. Use `BitvSet`.
10609 * extra: Performance of JSON parsing greatly improved.
10610 * extra: `semver` updated to SemVer 2.0.0.
10611 * extra: `term` handles more terminals correctly.
10612 * extra: `dbg` module removed.
10613 * extra: `par` module removed.
10614 * extra: `future` was cleaned up, with some method renames.
10615 * extra: Most free functions in `getopts` were converted to methods.
10618 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
10619 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
10620 similarly to gcc's `--march` flag.
10621 * rustc's performance compiling small crates is much better.
10622 * rustpkg has received many improvements.
10623 * rustpkg supports git tags as package IDs.
10624 * rustpkg builds into target-specific directories so it can be used for
10626 * The number of concurrent test tasks is controlled by the environment
10627 variable RUST_TEST_TASKS.
10628 * The test harness can now report metrics for benchmarks.
10629 * All tools have man pages.
10630 * Programs compiled with `--test` now support the `-h` and `--help` flags.
10631 * The runtime uses jemalloc for allocations.
10632 * Segmented stacks are temporarily disabled as part of the transition to
10633 the new runtime. Stack overflows are possible!
10634 * A new documentation backend, rustdoc_ng, is available for use. It is
10635 still invoked through the normal `rustdoc` command.
10638 Version 0.7 (2013-07-03)
10639 =======================
10641 * ~2000 changes, numerous bugfixes
10644 * `impl`s no longer accept a visibility qualifier. Put them on methods
10646 * The borrow checker has been rewritten with flow-sensitivity, fixing
10647 many bugs and inconveniences.
10648 * The `self` parameter no longer implicitly means `&'self self`,
10649 and can be explicitly marked with a lifetime.
10650 * Overloadable compound operators (`+=`, etc.) have been temporarily
10651 removed due to bugs.
10652 * The `for` loop protocol now requires `for`-iterators to return `bool`
10653 so they compose better.
10654 * The `Durable` trait is replaced with the `'static` bounds.
10655 * Trait default methods work more often.
10656 * Structs with the `#[packed]` attribute have byte alignment and
10657 no padding between fields.
10658 * Type parameters bound by `Copy` must now be copied explicitly with
10659 the `copy` keyword.
10660 * It is now illegal to move out of a dereferenced unsafe pointer.
10661 * `Option<~T>` is now represented as a nullable pointer.
10662 * `@mut` does dynamic borrow checks correctly.
10663 * The `main` function is only detected at the topmost level of the crate.
10664 The `#[main]` attribute is still valid anywhere.
10665 * Struct fields may no longer be mutable. Use inherited mutability.
10666 * The `#[no_send]` attribute makes a type that would otherwise be
10668 * The `#[no_freeze]` attribute makes a type that would otherwise be
10670 * Unbounded recursion will abort the process after reaching the limit
10671 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
10672 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
10673 are never implicitly copyable.
10674 * `#[static_assert]` makes compile-time assertions about static bools.
10675 * At long last, 'argument modes' no longer exist.
10676 * The rarely used `use mod` statement no longer exists.
10678 * Syntax extensions
10679 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
10681 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
10682 `Rand`, `Zero` and `ToStr` can all be automatically derived with
10683 `#[deriving(...)]`.
10684 * The `bytes!` macro returns a vector of bytes for string, u8, char,
10685 and unsuffixed integer literals.
10688 * The `core` crate was renamed to `std`.
10689 * The `std` crate was renamed to `extra`.
10690 * More and improved documentation.
10691 * std: `iterator` module for external iterator objects.
10692 * Many old-style (internal, higher-order function) iterators replaced by
10693 implementations of `Iterator`.
10694 * std: Many old internal vector and string iterators,
10695 incl. `any`, `all`. removed.
10696 * std: The `finalize` method of `Drop` renamed to `drop`.
10697 * std: The `drop` method now takes `&mut self` instead of `&self`.
10698 * std: The prelude no longer re-exports any modules, only types and traits.
10699 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
10700 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
10701 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
10702 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
10703 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
10704 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
10705 * std: Many types implement `Clone`.
10706 * std: `path` type renamed to `Path`.
10707 * std: `mut` module and `Mut` type removed.
10708 * std: Many standalone functions removed in favor of methods and iterators
10709 in `vec`, `str`. In the future methods will also work as functions.
10710 * std: `reinterpret_cast` removed. Use `transmute`.
10711 * std: ascii string handling in `std::ascii`.
10712 * std: `Rand` is implemented for ~/@.
10713 * std: `run` module for spawning processes overhauled.
10714 * std: Various atomic types added to `unstable::atomic`.
10715 * std: Various types implement `Zero`.
10716 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
10717 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
10718 * std: Added `os::mkdir_recursive`.
10719 * std: Added `os::glob` function performs filesystems globs.
10720 * std: `FuzzyEq` renamed to `ApproxEq`.
10721 * std: `Map` now defines `pop` and `swap` methods.
10722 * std: `Cell` constructors converted to static methods.
10723 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
10724 * extra: `flate` module moved from `std` to `extra`.
10725 * extra: `fileinput` module for iterating over a series of files.
10726 * extra: `Complex` number type and `complex` module.
10727 * extra: `Rational` number type and `rational` module.
10728 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
10729 * extra: `term` uses terminfo now, is more correct.
10730 * extra: `arc` functions converted to methods.
10731 * extra: Implementation of fixed output size variations of SHA-2.
10734 * `unused_variables` lint mode for unused variables (default: warn).
10735 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
10737 * `unused_mut` lint mode for identifying unused `mut` qualifiers
10739 * `dead_assignment` lint mode for unread variables (default: warn).
10740 * `unnecessary_allocation` lint mode detects some heap allocations that are
10741 immediately borrowed so could be written without allocating (default: warn).
10742 * `missing_doc` lint mode (default: allow).
10743 * `unreachable_code` lint mode (default: warn).
10744 * The `rusti` command has been rewritten and a number of bugs addressed.
10745 * rustc outputs in color on more terminals.
10746 * rustc accepts a `--link-args` flag to pass arguments to the linker.
10747 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
10748 * Compiling with `-g` will make the binary record information about
10749 dynamic borrowcheck failures for debugging.
10750 * rustdoc has a nicer stylesheet.
10751 * Various improvements to rustdoc.
10752 * Improvements to rustpkg (see the detailed release notes).
10755 Version 0.6 (2013-04-03)
10756 ========================
10758 * ~2100 changes, numerous bugfixes
10761 * The self type parameter in traits is now spelled `Self`
10762 * The `self` parameter in trait and impl methods must now be explicitly
10763 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
10764 * Static methods no longer require the `static` keyword and instead
10765 are distinguished by the lack of a `self` parameter
10766 * Replaced the `Durable` trait with the `'static` lifetime
10767 * The old closure type syntax with the trailing sigil has been
10768 removed in favor of the more consistent leading sigil
10769 * `super` is a keyword, and may be prefixed to paths
10770 * Trait bounds are separated with `+` instead of whitespace
10771 * Traits are implemented with `impl Trait for Type`
10772 instead of `impl Type: Trait`
10773 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
10774 * The `export` keyword has finally been removed
10775 * The `move` keyword has been removed (see "Semantic changes")
10776 * The interior mutability qualifier on vectors, `[mut T]`, has been
10777 removed. Use `&mut [T]`, etc.
10778 * `mut` is no longer valid in `~mut T`. Use inherited mutability
10779 * `fail` is no longer a keyword. Use `fail!()`
10780 * `assert` is no longer a keyword. Use `assert!()`
10781 * `log` is no longer a keyword. use `debug!`, etc.
10782 * 1-tuples may be represented as `(T,)`
10783 * Struct fields may no longer be `mut`. Use inherited mutability,
10784 `@mut T`, `core::mut` or `core::cell`
10785 * `extern mod { ... }` is no longer valid syntax for foreign
10786 function modules. Use extern blocks: `extern { ... }`
10787 * Newtype enums removed. Use tuple-structs.
10788 * Trait implementations no longer support visibility modifiers
10789 * Pattern matching over vectors improved and expanded
10790 * `const` renamed to `static` to correspond to lifetime name,
10791 and make room for future `static mut` unsafe mutable globals.
10792 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
10793 * `Clone` implementations can be automatically generated with
10794 `#[deriving(Clone)]`
10795 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
10796 instead of `foo as Bar`.
10797 * Fixed length vector types are now written as `[int, .. 3]`
10798 instead of `[int * 3]`.
10799 * Fixed length vector types can express the length as a constant
10800 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
10803 * Types with owned pointers or custom destructors move by default,
10804 eliminating the `move` keyword
10805 * All foreign functions are considered unsafe
10806 * &mut is now unaliasable
10807 * Writes to borrowed @mut pointers are prevented dynamically
10809 * The name of the main function can be customized using #[main]
10810 * The default type of an inferred closure is &fn instead of @fn
10811 * `use` statements may no longer be "chained" - they cannot import
10812 identifiers imported by previous `use` statements
10813 * `use` statements are crate relative, importing from the "top"
10814 of the crate by default. Paths may be prefixed with `super::`
10815 or `self::` to change the search behavior.
10816 * Method visibility is inherited from the implementation declaration
10817 * Structural records have been removed
10818 * Many more types can be used in static items, including enums
10819 'static-lifetime pointers and vectors
10820 * Pattern matching over vectors improved and expanded
10821 * Typechecking of closure types has been overhauled to
10822 improve inference and eliminate unsoundness
10823 * Macros leave scope at the end of modules, unless that module is
10824 tagged with #[macro_escape]
10827 * Added big integers to `std::bigint`
10828 * Removed `core::oldcomm` module
10829 * Added pipe-based `core::comm` module
10830 * Numeric traits have been reorganized under `core::num`
10831 * `vec::slice` finally returns a slice
10832 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
10833 * Containers reorganized around traits in `core::container`
10834 * `core::dvec` removed, `~[T]` is a drop-in replacement
10835 * `core::send_map` renamed to `core::hashmap`
10836 * `std::map` removed; replaced with `core::hashmap`
10837 * `std::treemap` reimplemented as an owned balanced tree
10838 * `std::deque` and `std::smallintmap` reimplemented as owned containers
10839 * `core::trie` added as a fast ordered map for integer keys
10840 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
10841 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
10842 overload the comparison operators, whereas `TotalOrd` is used
10843 by certain container types
10846 * Replaced the 'cargo' package manager with 'rustpkg'
10847 * Added all-purpose 'rust' tool
10848 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
10849 * rustc now *attempts* to offer spelling suggestions
10850 * Improved support for ARM and Android
10851 * Preliminary MIPS backend
10852 * Improved foreign function ABI implementation for x86, x86_64
10853 * Various memory usage improvements
10854 * Rust code may be embedded in foreign code under limited circumstances
10855 * Inline assembler supported by new asm!() syntax extension.
10858 Version 0.5 (2012-12-21)
10859 ===========================
10861 * ~900 changes, numerous bugfixes
10864 * Removed `<-` move operator
10865 * Completed the transition from the `#fmt` extension syntax to `fmt!`
10866 * Removed old fixed length vector syntax - `[T]/N`
10867 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
10868 * Macros may now expand to items and statements
10869 * `a.b()` is always parsed as a method call, never as a field projection
10870 * `Eq` and `IterBytes` implementations can be automatically generated
10871 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
10872 * Removed the special crate language for `.rc` files
10873 * Function arguments may consist of any irrefutable pattern
10876 * `&` and `~` pointers may point to objects
10877 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
10878 * Enum variants may be structs
10879 * Destructors can be added to all nominal types with the Drop trait
10880 * Structs and nullary enum variants may be constants
10881 * Values that cannot be implicitly copied are now automatically moved
10882 without writing `move` explicitly
10883 * `&T` may now be coerced to `*T`
10884 * Coercions happen in `let` statements as well as function calls
10885 * `use` statements now take crate-relative paths
10886 * The module and type namespaces have been merged so that static
10887 method names can be resolved under the trait in which they are
10890 * Improved support for language features
10891 * Trait inheritance works in many scenarios
10892 * More support for explicit self arguments in methods - `self`, `&self`
10893 `@self`, and `~self` all generally work as expected
10894 * Static methods work in more situations
10895 * Experimental: Traits may declare default methods for the implementations
10899 * New condition handling system in `core::condition`
10900 * Timsort added to `std::sort`
10901 * New priority queue, `std::priority_queue`
10902 * Pipes for serializable types, `std::flatpipes'
10903 * Serialization overhauled to be trait-based
10904 * Expanded `getopts` definitions
10905 * Moved futures to `std`
10906 * More functions are pure now
10907 * `core::comm` renamed to `oldcomm`. Still deprecated
10908 * `rustdoc` and `cargo` are libraries now
10911 * Added a preliminary REPL, `rusti`
10912 * License changed from MIT to dual MIT/APL2
10915 Version 0.4 (2012-10-15)
10916 ==========================
10918 * ~2000 changes, numerous bugfixes
10921 * All keywords are now strict and may not be used as identifiers anywhere
10922 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
10923 'of', 'with', 'to', 'class'.
10924 * Classes are replaced with simpler structs
10925 * Explicit method self types
10926 * `ret` became `return` and `alt` became `match`
10927 * `import` is now `use`; `use is now `extern mod`
10928 * `extern mod { ... }` is now `extern { ... }`
10929 * `use mod` is the recommended way to import modules
10930 * `pub` and `priv` replace deprecated export lists
10931 * The syntax of `match` pattern arms now uses fat arrow (=>)
10932 * `main` no longer accepts an args vector; use `os::args` instead
10935 * Trait implementations are now coherent, ala Haskell typeclasses
10936 * Trait methods may be static
10937 * Argument modes are deprecated
10938 * Borrowed pointers are much more mature and recommended for use
10939 * Strings and vectors in the static region are stored in constant memory
10940 * Typestate was removed
10941 * Resolution rewritten to be more reliable
10942 * Support for 'dual-mode' data structures (freezing and thawing)
10945 * Most binary operators can now be overloaded via the traits in
10947 * `std::net::url` for representing URLs
10948 * Sendable hash maps in `core::send_map`
10949 * `core::task' gained a (currently unsafe) task-local storage API
10952 * An efficient new intertask communication primitive called the pipe,
10953 along with a number of higher-level channel types, in `core::pipes`
10954 * `std::arc`, an atomically reference counted, immutable, shared memory
10956 * `std::sync`, various exotic synchronization tools based on arcs and pipes
10957 * Futures are now based on pipes and sendable
10958 * More robust linked task failure
10959 * Improved task builder API
10962 * Improved error reporting
10963 * Preliminary JIT support
10964 * Preliminary work on precise GC
10965 * Extensive architectural improvements to rustc
10966 * Begun a transition away from buggy C++-based reflection (shape) code to
10967 Rust-based (visitor) code
10968 * All hash functions and tables converted to secure, randomized SipHash
10971 Version 0.3 (2012-07-12)
10972 ========================
10974 * ~1900 changes, numerous bugfixes
10976 * New coding conveniences
10977 * Integer-literal suffix inference
10978 * Per-item control over warnings, errors
10979 * #[cfg(windows)] and #[cfg(unix)] attributes
10980 * Documentation comments
10981 * More compact closure syntax
10982 * 'do' expressions for treating higher-order functions as
10984 * *-patterns (wildcard extended to all constructor fields)
10987 * Name resolution pass and exhaustiveness checker rewritten
10988 * Region pointers and borrow checking supersede alias
10990 * Init-ness checking is now provided by a region-based liveness
10991 pass instead of the typestate pass; same for last-use analysis
10992 * Extensive work on region pointers
10994 * Experimental new language features
10995 * Slices and fixed-size, interior-allocated vectors
10996 * #!-comments for lang versioning, shell execution
10997 * Destructors and iface implementation for classes;
10998 type-parameterized classes and class methods
10999 * 'const' type kind for types that can be used to implement
11000 shared-memory concurrency patterns
11004 * Removal of various obsolete features
11005 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
11006 'crust', 'native' (now 'extern'), 'cont' (now 'again')
11008 * Constructs: do-while loops ('do' repurposed), fn binding,
11009 resources (replaced by destructors)
11011 * Compiler reorganization
11012 * Syntax-layer of compiler split into separate crate
11013 * Clang (from LLVM project) integrated into build
11014 * Typechecker split into sub-modules
11017 * New time functions
11018 * Extension methods for many built-in types
11019 * Arc: atomic-refcount read-only / exclusive-use shared cells
11020 * Par: parallel map and search routines
11021 * Extensive work on libuv interface
11022 * Much vector code moved to libraries
11023 * Syntax extensions: #line, #col, #file, #mod, #stringify,
11024 #include, #include_str, #include_bin
11026 * Tool improvements
11027 * Cargo automatically resolves dependencies
11030 Version 0.2 (2012-03-29)
11031 =========================
11033 * >1500 changes, numerous bugfixes
11035 * New docs and doc tooling
11037 * New port: FreeBSD x86_64
11039 * Compilation model enhancements
11040 * Generics now specialized, multiply instantiated
11041 * Functions now inlined across separate crates
11043 * Scheduling, stack and threading fixes
11044 * Noticeably improved message-passing performance
11045 * Explicit schedulers
11049 * Experimental new language features
11050 * Operator overloading
11054 * Various language extensions
11055 * C-callback function types: 'crust fn ...'
11056 * Infinite-loop construct: 'loop { ... }'
11057 * Shorten 'mutable' to 'mut'
11058 * Required mutable-local qualifier: 'let mut ...'
11059 * Basic glob-exporting: 'export foo::*;'
11060 * Alt now exhaustive, 'alt check' for runtime-checked
11061 * Block-function form of 'for' loop, with 'break' and 'ret'.
11064 * AST quasi-quote syntax extension
11065 * Revived libuv interface
11066 * New modules: core::{future, iter}, std::arena
11067 * Merged per-platform std::{os*, fs*} to core::{libc, os}
11068 * Extensive cleanup, regularization in libstd, libcore
11071 Version 0.1 (2012-01-20)
11072 ===============================
11074 * Most language features work, including:
11075 * Unique pointers, unique closures, move semantics
11076 * Interface-constrained generics
11077 * Static interface dispatch
11079 * Multithread task scheduling
11080 * Typestate predicates
11081 * Failure unwinding, destructors
11082 * Pattern matching and destructuring assignment
11083 * Lightweight block-lambda syntax
11084 * Preliminary macro-by-example
11086 * Compiler works with the following configurations:
11087 * Linux: x86 and x86_64 hosts and targets
11088 * macOS: x86 and x86_64 hosts and targets
11089 * Windows: x86 hosts and targets
11091 * Cross compilation / multi-target configuration supported.
11093 * Preliminary API-documentation and package-management tools included.
11097 * Documentation is incomplete.
11099 * Performance is below intended target.
11101 * Standard library APIs are subject to extensive change, reorganization.
11103 * Language-level versioning is not yet operational - future code will
11104 break unexpectedly.