1 Version 1.46.0 (2020-08-27)
2 ==========================
6 - [`if`, `match`, and `loop` expressions can now be used in const functions.][72437]
7 - [Additionally you are now also able to coerce and cast to slices (`&[T]`) in
8 const functions.][73862]
9 - [The `#[track_caller]` attribute can now be added to functions to use the
10 function's caller's location information for panic messages.][72445]
11 - [Recursively indexing into tuples no longer needs parentheses.][71322] E.g.
12 `x.0.0` over `(x.0).0`.
13 - [`mem::transmute` can now be used in static and constants.][72920] **Note**
14 You currently can't use `mem::transmute` in constant functions.
18 - [You can now use the `cdylib` target on Apple iOS and tvOS platforms.][73516]
19 - [Enabled static "Position Independent Executables" by default
20 for `x86_64-unknown-linux-musl`.][70740]
24 - [`mem::forget` is now a `const fn`.][73887]
25 - [`String` now implements `From<char>`.][73466]
26 - [The `leading_ones`, and `trailing_ones` methods have been stabilised for all
27 integer types.][73032]
28 - [`vec::IntoIter<T>` now implements `AsRef<[T]>`.][72583]
29 - [All non-zero integer types (`NonZeroU8`) now implement `TryFrom` for their
30 zero-able equivalent (e.g. `TryFrom<u8>`).][72717]
31 - [`&[T]` and `&mut [T]` now implement `PartialEq<Vec<T>>`.][71660]
32 - [`(String, u16)` now implements `ToSocketAddrs`.][73007]
33 - [`vec::Drain<'_, T>` now implements `AsRef<[T]>`.][72584]
38 - [`vec::Drain::as_slice`]
42 Added a number of new environment variables that are now available when
45 - [`CARGO_BIN_NAME` and `CARGO_CRATE_NAME`][cargo/8270] Providing the name of
46 the specific binary being compiled and the name of the crate.
47 - [`CARGO_PKG_LICENSE`][cargo/8325] The license from the manifest of the package.
48 - [`CARGO_PKG_LICENSE_FILE`][cargo/8387] The path to the license file.
52 - [The target configuration option `abi_blacklist` has been renamed
53 to `unsupported_abis`.][74150] The old name will still continue to work.
54 - [Rustc will now warn if you have a C-like enum that implements `Drop`.][72331]
55 This was previously accepted but will become a hard error in a future release.
56 - [Rustc will fail to compile if you have a struct with
57 `#[repr(i128)]` or `#[repr(u128)]`.][74109] This representation is currently only
59 - [Tokens passed to `macro_rules!` are now always captured.][73293] This helps
60 ensure that spans have the correct information, and may cause breakage if you
61 were relying on receiving spans with dummy information.
62 - [The InnoSetup installer for Windows is no longer available.][72569] This was
63 a legacy installer that was replaced by a MSI installer a few years ago but
64 was still being built.
65 - [`{f32, f64}::asinh` now returns the correct values for negative numbers.][72486]
66 - [Rustc will no longer accept overlapping trait implementations that only
67 differ in how the lifetime was bound.][72493]
68 - [Rustc now correctly relates the lifetime of an existential associated
69 type.][71896] This fixes some edge cases where `rustc` would erroneously allow
70 you to pass a shorter lifetime than expected.
72 [74109]: https://github.com/rust-lang/rust/pull/74109/
73 [74150]: https://github.com/rust-lang/rust/pull/74150/
74 [73862]: https://github.com/rust-lang/rust/pull/73862/
75 [73887]: https://github.com/rust-lang/rust/pull/73887/
76 [73466]: https://github.com/rust-lang/rust/pull/73466/
77 [73516]: https://github.com/rust-lang/rust/pull/73516/
78 [73293]: https://github.com/rust-lang/rust/pull/73293/
79 [73007]: https://github.com/rust-lang/rust/pull/73007/
80 [73032]: https://github.com/rust-lang/rust/pull/73032/
81 [72920]: https://github.com/rust-lang/rust/pull/72920/
82 [72569]: https://github.com/rust-lang/rust/pull/72569/
83 [72583]: https://github.com/rust-lang/rust/pull/72583/
84 [72584]: https://github.com/rust-lang/rust/pull/72584/
85 [72717]: https://github.com/rust-lang/rust/pull/72717/
86 [72437]: https://github.com/rust-lang/rust/pull/72437/
87 [72445]: https://github.com/rust-lang/rust/pull/72445/
88 [72486]: https://github.com/rust-lang/rust/pull/72486/
89 [72493]: https://github.com/rust-lang/rust/pull/72493/
90 [72331]: https://github.com/rust-lang/rust/pull/72331/
91 [71896]: https://github.com/rust-lang/rust/pull/71896/
92 [71660]: https://github.com/rust-lang/rust/pull/71660/
93 [71322]: https://github.com/rust-lang/rust/pull/71322/
94 [70740]: https://github.com/rust-lang/rust/pull/70740/
95 [cargo/8270]: https://github.com/rust-lang/cargo/pull/8270/
96 [cargo/8325]: https://github.com/rust-lang/cargo/pull/8325/
97 [cargo/8387]: https://github.com/rust-lang/cargo/pull/8387/
98 [`Option::zip`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.zip
99 [`vec::Drain::as_slice`]: https://doc.rust-lang.org/stable/std/vec/struct.Drain.html#method.as_slice
102 Version 1.45.2 (2020-08-03)
103 ==========================
105 * [Fix bindings in tuple struct patterns][74954]
106 * [Fix track_caller integration with trait objects][74784]
108 [74954]: https://github.com/rust-lang/rust/issues/74954
109 [74784]: https://github.com/rust-lang/rust/issues/74784
112 Version 1.45.1 (2020-07-30)
113 ==========================
115 * [Fix const propagation with references.][73613]
116 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
117 * [Avoid spurious implicit region bound.][74509]
118 * [Install clippy on x.py install][74457]
120 [73613]: https://github.com/rust-lang/rust/pull/73613
121 [73078]: https://github.com/rust-lang/rust/issues/73078
122 [74509]: https://github.com/rust-lang/rust/pull/74509
123 [74457]: https://github.com/rust-lang/rust/pull/74457
126 Version 1.45.0 (2020-07-16)
127 ==========================
131 - [Out of range float to int conversions using `as` has been defined as a saturating
132 conversion.][71269] This was previously undefined behaviour, but you can use the
133 `{f64, f32}::to_int_unchecked` methods to continue using the current behaviour, which
134 may be desirable in rare performance sensitive situations.
135 - [`mem::Discriminant<T>` now uses `T`'s discriminant type instead of always
137 - [Function like procedural macros can now be used in expression, pattern, and statement
138 positions.][68717] This means you can now use a function-like procedural macro
139 anywhere you can use a declarative (`macro_rules!`) macro.
143 - [You can now override individual target features through the `target-feature`
144 flag.][72094] E.g. `-C target-feature=+avx2 -C target-feature=+fma` is now
145 equivalent to `-C target-feature=+avx2,+fma`.
146 - [Added the `force-unwind-tables` flag.][69984] This option allows
147 rustc to always generate unwind tables regardless of panic strategy.
148 - [Added the `embed-bitcode` flag.][71716] This codegen flag allows rustc
149 to include LLVM bitcode into generated `rlib`s (this is on by default).
150 - [Added the `tiny` value to the `code-model` codegen flag.][72397]
151 - [Added tier 3 support\* for the `mipsel-sony-psp` target.][72062]
152 - [Added tier 3 support for the `thumbv7a-uwp-windows-msvc` target.][72133]
154 \* Refer to Rust's [platform support page][forge-platform-support] for more
155 information on Rust's tiered platform support.
160 - [`net::{SocketAddr, SocketAddrV4, SocketAddrV6}` now implements `PartialOrd`
162 - [`proc_macro::TokenStream` now implements `Default`.][72234]
163 - [You can now use `char` with
164 `ops::{Range, RangeFrom, RangeFull, RangeInclusive, RangeTo}` to iterate over
165 a range of codepoints.][72413] E.g.
166 you can now write the following;
168 for ch in 'a'..='z' {
172 // Prints "abcdefghijklmnopqrstuvwxyz"
174 - [`OsString` now implements `FromStr`.][71662]
175 - [The `saturating_neg` method has been added to all signed integer primitive
176 types, and the `saturating_abs` method has been added for all integer
177 primitive types.][71886]
178 - [`Arc<T>`, `Rc<T>` now implement `From<Cow<'_, T>>`, and `Box` now
179 implements `From<Cow>` when `T` is `[T: Copy]`, `str`, `CStr`, `OsStr`,
181 - [`Box<[T]>` now implements `From<[T; N]>`.][71095]
182 - [`BitOr` and `BitOrAssign` are implemented for all `NonZero`
183 integer types.][69813]
184 - [The `fetch_min`, and `fetch_max` methods have been added to all atomic
185 integer types.][72324]
186 - [The `fetch_update` method has been added to all atomic integer types.][71843]
191 - [`BTreeMap::remove_entry`]
193 - [`rc::Weak::as_ptr`]
194 - [`rc::Weak::from_raw`]
195 - [`rc::Weak::into_raw`]
196 - [`str::strip_prefix`]
197 - [`str::strip_suffix`]
198 - [`sync::Weak::as_ptr`]
199 - [`sync::Weak::from_raw`]
200 - [`sync::Weak::into_raw`]
201 - [`char::UNICODE_VERSION`]
202 - [`Span::resolved_at`]
203 - [`Span::located_at`]
204 - [`Span::mixed_site`]
205 - [`unix::process::CommandExt::arg0`]
210 - [Cargo uses the `embed-bitcode` flag to optimize disk usage and build
215 - [Rustdoc now supports strikethrough text in Markdown.][71928] E.g.
216 `~~outdated information~~` becomes "~~outdated information~~".
217 - [Added an emoji to Rustdoc's deprecated API message.][72014]
221 - [Trying to self initialize a static value (that is creating a value using
222 itself) is unsound and now causes a compile error.][71140]
223 - [`{f32, f64}::powi` now returns a slightly different value on Windows.][73420]
224 This is due to changes in LLVM's intrinsics which `{f32, f64}::powi` uses.
225 - [Rustdoc's CLI's extra error exit codes have been removed.][71900] These were
226 previously undocumented and not intended for public use. Rustdoc still provides
227 a non-zero exit code on errors.
228 - [Rustc's `lto` flag is incompatible with the new `embed-bitcode=no`.][71848]
229 This may cause issues if LTO is enabled through `RUSTFLAGS` or `cargo rustc`
230 flags while cargo is adding `embed-bitcode` itself. The recommended way to
231 control LTO is with Cargo profiles, either in `Cargo.toml` or `.cargo/config`,
232 or by setting `CARGO_PROFILE_<name>_LTO` in the environment.
236 - [Make clippy a git subtree instead of a git submodule][70655]
237 - [Unify the undo log of all snapshot types][69464]
239 [71848]: https://github.com/rust-lang/rust/issues/71848/
240 [73420]: https://github.com/rust-lang/rust/issues/73420/
241 [72324]: https://github.com/rust-lang/rust/pull/72324/
242 [71843]: https://github.com/rust-lang/rust/pull/71843/
243 [71886]: https://github.com/rust-lang/rust/pull/71886/
244 [72234]: https://github.com/rust-lang/rust/pull/72234/
245 [72239]: https://github.com/rust-lang/rust/pull/72239/
246 [72397]: https://github.com/rust-lang/rust/pull/72397/
247 [72413]: https://github.com/rust-lang/rust/pull/72413/
248 [72014]: https://github.com/rust-lang/rust/pull/72014/
249 [72062]: https://github.com/rust-lang/rust/pull/72062/
250 [72094]: https://github.com/rust-lang/rust/pull/72094/
251 [72133]: https://github.com/rust-lang/rust/pull/72133/
252 [71900]: https://github.com/rust-lang/rust/pull/71900/
253 [71928]: https://github.com/rust-lang/rust/pull/71928/
254 [71662]: https://github.com/rust-lang/rust/pull/71662/
255 [71716]: https://github.com/rust-lang/rust/pull/71716/
256 [71447]: https://github.com/rust-lang/rust/pull/71447/
257 [71269]: https://github.com/rust-lang/rust/pull/71269/
258 [71095]: https://github.com/rust-lang/rust/pull/71095/
259 [71140]: https://github.com/rust-lang/rust/pull/71140/
260 [70655]: https://github.com/rust-lang/rust/pull/70655/
261 [70705]: https://github.com/rust-lang/rust/pull/70705/
262 [69984]: https://github.com/rust-lang/rust/pull/69984/
263 [69813]: https://github.com/rust-lang/rust/pull/69813/
264 [69464]: https://github.com/rust-lang/rust/pull/69464/
265 [68717]: https://github.com/rust-lang/rust/pull/68717/
266 [cargo/8066]: https://github.com/rust-lang/cargo/pull/8066
267 [`Arc::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Arc.html#method.as_ptr
268 [`BTreeMap::remove_entry`]: https://doc.rust-lang.org/stable/std/collections/struct.BTreeMap.html#method.remove_entry
269 [`Rc::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Rc.html#method.as_ptr
270 [`rc::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.as_ptr
271 [`rc::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.from_raw
272 [`rc::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/rc/struct.Weak.html#method.into_raw
273 [`sync::Weak::as_ptr`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.as_ptr
274 [`sync::Weak::from_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.from_raw
275 [`sync::Weak::into_raw`]: https://doc.rust-lang.org/stable/std/sync/struct.Weak.html#method.into_raw
276 [`str::strip_prefix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_prefix
277 [`str::strip_suffix`]: https://doc.rust-lang.org/stable/std/primitive.str.html#method.strip_suffix
278 [`char::UNICODE_VERSION`]: https://doc.rust-lang.org/stable/std/char/constant.UNICODE_VERSION.html
279 [`Span::resolved_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.resolved_at
280 [`Span::located_at`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.located_at
281 [`Span::mixed_site`]: https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.mixed_site
282 [`unix::process::CommandExt::arg0`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.arg0
285 Version 1.44.1 (2020-06-18)
286 ===========================
288 * [rustfmt accepts rustfmt_skip in cfg_attr again.][73078]
289 * [Don't hash executable filenames on apple platforms, fixing backtraces.][cargo/8329]
290 * [Fix crashes when finding backtrace on macOS.][71397]
291 * [Clippy applies lint levels into different files.][clippy/5356]
293 [71397]: https://github.com/rust-lang/rust/issues/71397
294 [73078]: https://github.com/rust-lang/rust/issues/73078
295 [cargo/8329]: https://github.com/rust-lang/cargo/pull/8329
296 [clippy/5356]: https://github.com/rust-lang/rust-clippy/issues/5356
299 Version 1.44.0 (2020-06-04)
300 ==========================
304 - [You can now use `async/.await` with `#[no_std]` enabled.][69033]
305 - [Added the `unused_braces` lint.][70081]
307 **Syntax-only changes**
309 - [Expansion-driven outline module parsing][69838]
314 mod baz; // `foo/bar/baz.rs` doesn't exist, but no error!
319 These are still rejected semantically, so you will likely receive an error but
320 these changes can be seen and parsed by macros and conditional compilation.
324 - [Rustc now respects the `-C codegen-units` flag in incremental mode.][70156]
325 Additionally when in incremental mode rustc defaults to 256 codegen units.
326 - [Refactored `catch_unwind` to have zero-cost, unless unwinding is enabled and
327 a panic is thrown.][67502]
328 - [Added tier 3\* support for the `aarch64-unknown-none` and
329 `aarch64-unknown-none-softfloat` targets.][68334]
330 - [Added tier 3 support for `arm64-apple-tvos` and
331 `x86_64-apple-tvos` targets.][68191]
336 - [Special cased `vec![]` to map directly to `Vec::new()`.][70632] This allows
337 `vec![]` to be able to be used in `const` contexts.
338 - [`convert::Infallible` now implements `Hash`.][70281]
339 - [`OsString` now implements `DerefMut` and `IndexMut` returning
340 a `&mut OsStr`.][70048]
341 - [Unicode 13 is now supported.][69929]
342 - [`String` now implements `From<&mut str>`.][69661]
343 - [`IoSlice` now implements `Copy`.][69403]
344 - [`Vec<T>` now implements `From<[T; N]>`.][68692] Where `N` is at most 32.
345 - [`proc_macro::LexError` now implements `fmt::Display` and `Error`.][68899]
346 - [`from_le_bytes`, `to_le_bytes`, `from_be_bytes`, `to_be_bytes`,
347 `from_ne_bytes`, and `to_ne_bytes` methods are now `const` for all
348 integer types.][69373]
352 - [`PathBuf::with_capacity`]
353 - [`PathBuf::capacity`]
355 - [`PathBuf::reserve`]
356 - [`PathBuf::reserve_exact`]
357 - [`PathBuf::shrink_to_fit`]
358 - [`f32::to_int_unchecked`]
359 - [`f64::to_int_unchecked`]
360 - [`Layout::align_to`]
361 - [`Layout::pad_to_align`]
367 - [Added the `cargo tree` command which will print a tree graph of
368 your dependencies.][cargo/8062] E.g.
370 mdbook v0.3.2 (/Users/src/rust/mdbook)
372 │ ├── html5ever v0.24.0
374 │ │ │ └── cfg-if v0.1.9
376 │ │ └── markup5ever v0.9.0
377 │ │ ├── log v0.4.8 (*)
379 │ │ │ └── phf_shared v0.7.24
380 │ │ │ ├── siphasher v0.2.3
381 │ │ │ └── unicase v1.4.2
382 │ │ │ [build-dependencies]
383 │ │ │ └── version_check v0.1.5
386 You can also display dependencies on multiple versions of the same crate with
387 `cargo tree -d` (short for `cargo tree --duplicates`).
391 - [Rustdoc now allows you to specify `--crate-version` to have rustdoc include
392 the version in the sidebar.][69494]
396 - [Rustc now correctly generates static libraries on Windows GNU targets with
397 the `.a` extension, rather than the previous `.lib`.][70937]
398 - [Removed the `-C no_integrated_as` flag from rustc.][70345]
399 - [The `file_name` property in JSON output of macro errors now points the actual
400 source file rather than the previous format of `<NAME macros>`.][70969]
401 **Note:** this may not point to a file that actually exists on the user's system.
402 - [The minimum required external LLVM version has been bumped to LLVM 8.][71147]
403 - [`mem::{zeroed, uninitialised}` will now panic when used with types that do
404 not allow zero initialization such as `NonZeroU8`.][66059] This was
405 previously a warning.
406 - [In 1.45.0 (the next release) converting a `f64` to `u32` using the `as`
407 operator has been defined as a saturating operation.][71269] This was previously
408 undefined behaviour, but you can use the `{f64, f32}::to_int_unchecked` methods to
409 continue using the current behaviour, which may be desirable in rare performance
410 sensitive situations.
414 These changes provide no direct user facing benefits, but represent significant
415 improvements to the internals and overall performance of rustc and
418 - [dep_graph Avoid allocating a set on when the number reads are small.][69778]
419 - [Replace big JS dict with JSON parsing.][71250]
421 [69373]: https://github.com/rust-lang/rust/pull/69373/
422 [66059]: https://github.com/rust-lang/rust/pull/66059/
423 [68191]: https://github.com/rust-lang/rust/pull/68191/
424 [68899]: https://github.com/rust-lang/rust/pull/68899/
425 [71147]: https://github.com/rust-lang/rust/pull/71147/
426 [71250]: https://github.com/rust-lang/rust/pull/71250/
427 [70937]: https://github.com/rust-lang/rust/pull/70937/
428 [70969]: https://github.com/rust-lang/rust/pull/70969/
429 [70632]: https://github.com/rust-lang/rust/pull/70632/
430 [70281]: https://github.com/rust-lang/rust/pull/70281/
431 [70345]: https://github.com/rust-lang/rust/pull/70345/
432 [70048]: https://github.com/rust-lang/rust/pull/70048/
433 [70081]: https://github.com/rust-lang/rust/pull/70081/
434 [70156]: https://github.com/rust-lang/rust/pull/70156/
435 [71269]: https://github.com/rust-lang/rust/pull/71269/
436 [69838]: https://github.com/rust-lang/rust/pull/69838/
437 [69929]: https://github.com/rust-lang/rust/pull/69929/
438 [69661]: https://github.com/rust-lang/rust/pull/69661/
439 [69778]: https://github.com/rust-lang/rust/pull/69778/
440 [69494]: https://github.com/rust-lang/rust/pull/69494/
441 [69403]: https://github.com/rust-lang/rust/pull/69403/
442 [69033]: https://github.com/rust-lang/rust/pull/69033/
443 [68692]: https://github.com/rust-lang/rust/pull/68692/
444 [68334]: https://github.com/rust-lang/rust/pull/68334/
445 [67502]: https://github.com/rust-lang/rust/pull/67502/
446 [cargo/8062]: https://github.com/rust-lang/cargo/pull/8062/
447 [`PathBuf::with_capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.with_capacity
448 [`PathBuf::capacity`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.capacity
449 [`PathBuf::clear`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.clear
450 [`PathBuf::reserve`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve
451 [`PathBuf::reserve_exact`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.reserve_exact
452 [`PathBuf::shrink_to_fit`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html#method.shrink_to_fit
453 [`f32::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_int_unchecked
454 [`f64::to_int_unchecked`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_int_unchecked
455 [`Layout::align_to`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.align_to
456 [`Layout::pad_to_align`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.pad_to_align
457 [`Layout::array`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.array
458 [`Layout::extend`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html#method.extend
461 Version 1.43.1 (2020-05-07)
462 ===========================
464 * [Updated openssl-src to 1.1.1g for CVE-2020-1967.][71430]
465 * [Fixed the stabilization of AVX-512 features.][71473]
466 * [Fixed `cargo package --list` not working with unpublished dependencies.][cargo/8151]
468 [71430]: https://github.com/rust-lang/rust/pull/71430
469 [71473]: https://github.com/rust-lang/rust/issues/71473
470 [cargo/8151]: https://github.com/rust-lang/cargo/issues/8151
473 Version 1.43.0 (2020-04-23)
474 ==========================
478 - [Fixed using binary operations with `&{number}` (e.g. `&1.0`) not having
479 the type inferred correctly.][68129]
480 - [Attributes such as `#[cfg()]` can now be used on `if` expressions.][69201]
482 **Syntax only changes**
483 - [Allow `type Foo: Ord` syntactically.][69361]
484 - [Fuse associated and extern items up to defaultness.][69194]
485 - [Syntactically allow `self` in all `fn` contexts.][68764]
486 - [Merge `fn` syntax + cleanup item parsing.][68728]
487 - [`item` macro fragments can be interpolated into `trait`s, `impl`s, and `extern` blocks.][69366]
488 For example, you may now write:
490 macro_rules! mac_trait {
500 These are still rejected *semantically*, so you will likely receive an error but
501 these changes can be seen and parsed by macros and
502 conditional compilation.
507 - [You can now pass multiple lint flags to rustc to override the previous
508 flags.][67885] For example; `rustc -D unused -A unused-variables` denies
509 everything in the `unused` lint group except `unused-variables` which
510 is explicitly allowed. However, passing `rustc -A unused-variables -D unused` denies
511 everything in the `unused` lint group **including** `unused-variables` since
512 the allow flag is specified before the deny flag (and therefore overridden).
513 - [rustc will now prefer your system MinGW libraries over its bundled libraries
514 if they are available on `windows-gnu`.][67429]
515 - [rustc now buffers errors/warnings printed in JSON.][69227]
519 - [`Arc<[T; N]>`, `Box<[T; N]>`, and `Rc<[T; N]>`, now implement
520 `TryFrom<Arc<[T]>>`,`TryFrom<Box<[T]>>`, and `TryFrom<Rc<[T]>>`
521 respectively.][69538] **Note** These conversions are only available when `N`
523 - [You can now use associated constants on floats and integers directly, rather
524 than having to import the module.][68952] e.g. You can now write `u32::MAX` or
525 `f32::NAN` with no imports.
526 - [`u8::is_ascii` is now `const`.][68984]
527 - [`String` now implements `AsMut<str>`.][68742]
528 - [Added the `primitive` module to `std` and `core`.][67637] This module
529 reexports Rust's primitive types. This is mainly useful in macros
530 where you want avoid these types being shadowed.
531 - [Relaxed some of the trait bounds on `HashMap` and `HashSet`.][67642]
532 - [`string::FromUtf8Error` now implements `Clone + Eq`.][68738]
536 - [`Once::is_completed`]
541 - [`iter::once_with`]
545 - [You can now set config `[profile]`s in your `.cargo/config`, or through
546 your environment.][cargo/7823]
547 - [Cargo will now set `CARGO_BIN_EXE_<name>` pointing to a binary's
548 executable path when running integration tests or benchmarks.][cargo/7697]
549 `<name>` is the name of your binary as-is e.g. If you wanted the executable
550 path for a binary named `my-program`you would use `env!("CARGO_BIN_EXE_my-program")`.
554 - [Certain checks in the `const_err` lint were deemed unrelated to const
555 evaluation][69185], and have been moved to the `unconditional_panic` and
556 `arithmetic_overflow` lints.
561 - [Having trailing syntax in the `assert!` macro is now a hard error.][69548] This
562 has been a warning since 1.36.0.
563 - [Fixed `Self` not having the correctly inferred type.][69340] This incorrectly
564 led to some instances being accepted, and now correctly emits a hard error.
566 [69340]: https://github.com/rust-lang/rust/pull/69340
570 These changes provide no direct user facing benefits, but represent significant
571 improvements to the internals and overall performance of `rustc` and
574 - [All components are now built with `opt-level=3` instead of `2`.][67878]
575 - [Improved how rustc generates drop code.][67332]
576 - [Improved performance from `#[inline]`-ing certain hot functions.][69256]
577 - [traits: preallocate 2 Vecs of known initial size][69022]
578 - [Avoid exponential behaviour when relating types][68772]
579 - [Skip `Drop` terminators for enum variants without drop glue][68943]
580 - [Improve performance of coherence checks][68966]
581 - [Deduplicate types in the generator witness][68672]
582 - [Invert control in struct_lint_level.][68725]
584 [67332]: https://github.com/rust-lang/rust/pull/67332/
585 [67429]: https://github.com/rust-lang/rust/pull/67429/
586 [67637]: https://github.com/rust-lang/rust/pull/67637/
587 [67642]: https://github.com/rust-lang/rust/pull/67642/
588 [67878]: https://github.com/rust-lang/rust/pull/67878/
589 [67885]: https://github.com/rust-lang/rust/pull/67885/
590 [68129]: https://github.com/rust-lang/rust/pull/68129/
591 [68672]: https://github.com/rust-lang/rust/pull/68672/
592 [68725]: https://github.com/rust-lang/rust/pull/68725/
593 [68728]: https://github.com/rust-lang/rust/pull/68728/
594 [68738]: https://github.com/rust-lang/rust/pull/68738/
595 [68742]: https://github.com/rust-lang/rust/pull/68742/
596 [68764]: https://github.com/rust-lang/rust/pull/68764/
597 [68772]: https://github.com/rust-lang/rust/pull/68772/
598 [68943]: https://github.com/rust-lang/rust/pull/68943/
599 [68952]: https://github.com/rust-lang/rust/pull/68952/
600 [68966]: https://github.com/rust-lang/rust/pull/68966/
601 [68984]: https://github.com/rust-lang/rust/pull/68984/
602 [69022]: https://github.com/rust-lang/rust/pull/69022/
603 [69185]: https://github.com/rust-lang/rust/pull/69185/
604 [69194]: https://github.com/rust-lang/rust/pull/69194/
605 [69201]: https://github.com/rust-lang/rust/pull/69201/
606 [69227]: https://github.com/rust-lang/rust/pull/69227/
607 [69548]: https://github.com/rust-lang/rust/pull/69548/
608 [69256]: https://github.com/rust-lang/rust/pull/69256/
609 [69361]: https://github.com/rust-lang/rust/pull/69361/
610 [69366]: https://github.com/rust-lang/rust/pull/69366/
611 [69538]: https://github.com/rust-lang/rust/pull/69538/
612 [cargo/7823]: https://github.com/rust-lang/cargo/pull/7823
613 [cargo/7697]: https://github.com/rust-lang/cargo/pull/7697
614 [`Once::is_completed`]: https://doc.rust-lang.org/std/sync/struct.Once.html#method.is_completed
615 [`f32::LOG10_2`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG10_2.html
616 [`f32::LOG2_10`]: https://doc.rust-lang.org/std/f32/consts/constant.LOG2_10.html
617 [`f64::LOG10_2`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG10_2.html
618 [`f64::LOG2_10`]: https://doc.rust-lang.org/std/f64/consts/constant.LOG2_10.html
619 [`iter::once_with`]: https://doc.rust-lang.org/std/iter/fn.once_with.html
622 Version 1.42.0 (2020-03-12)
623 ==========================
627 - [You can now use the slice pattern syntax with subslices.][67712] e.g.
629 fn foo(words: &[&str]) {
631 ["Hello", "World", "!", ..] => println!("Hello World!"),
632 ["Foo", "Bar", ..] => println!("Baz"),
633 rest => println!("{:?}", rest),
637 - [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
638 that you can create an enum that has the exact layout and ABI of the type
640 - [There are some *syntax-only* changes:][67131]
641 - `default` is syntactically allowed before items in `trait` definitions.
642 - Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
643 leave out their bodies in favor of `;`.
644 - Bounds on associated types in `impl`s are now syntactically allowed
645 (e.g. `type Foo: Ord;`).
646 - `...` (the C-variadic type) may occur syntactically directly as the type of
647 any function parameter.
649 These are still rejected *semantically*, so you will likely receive an error
650 but these changes can be seen and parsed by procedural macros and
651 conditional compilation.
655 - [Added tier 2\* support for `armv7a-none-eabi`.][68253]
656 - [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
657 - [`Option::{expect,unwrap}` and
658 `Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
659 pointing to the location where they were called, rather than
660 `core`'s internals. ][67887]
662 \* Refer to Rust's [platform support page][forge-platform-support] for more
663 information on Rust's tiered platform support.
667 - [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
668 - [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
669 to implement `Sized`.][67935]
670 - [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
671 - [`Layout::new` is now `const`.][66254]
672 - [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
677 - [`CondVar::wait_while`]
678 - [`CondVar::wait_timeout_while`]
680 - [`DebugMap::value`]
681 - [`ManuallyDrop::take`]
683 - [`ptr::slice_from_raw_parts_mut`]
684 - [`ptr::slice_from_raw_parts`]
688 - [You no longer need to include `extern crate proc_macro;` to be able to
689 `use proc_macro;` in the `2018` edition.][cargo/7700]
693 - [`Error::description` has been deprecated, and its use will now produce a
694 warning.][66919] It's recommended to use `Display`/`to_string` instead.
696 [68253]: https://github.com/rust-lang/rust/pull/68253/
697 [68348]: https://github.com/rust-lang/rust/pull/68348/
698 [67935]: https://github.com/rust-lang/rust/pull/67935/
699 [68339]: https://github.com/rust-lang/rust/pull/68339/
700 [68122]: https://github.com/rust-lang/rust/pull/68122/
701 [67712]: https://github.com/rust-lang/rust/pull/67712/
702 [67887]: https://github.com/rust-lang/rust/pull/67887/
703 [67131]: https://github.com/rust-lang/rust/pull/67131/
704 [67233]: https://github.com/rust-lang/rust/pull/67233/
705 [66899]: https://github.com/rust-lang/rust/pull/66899/
706 [66919]: https://github.com/rust-lang/rust/pull/66919/
707 [66254]: https://github.com/rust-lang/rust/pull/66254/
708 [cargo/7700]: https://github.com/rust-lang/cargo/pull/7700
709 [`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
710 [`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
711 [`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
712 [`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
713 [`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
714 [`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
715 [`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
716 [`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
719 Version 1.41.1 (2020-02-27)
720 ===========================
722 * [Always check types of static items][69145]
723 * [Always check lifetime bounds of `Copy` impls][69145]
724 * [Fix miscompilation in callers of `Layout::repeat`][69225]
726 [69225]: https://github.com/rust-lang/rust/issues/69225
727 [69145]: https://github.com/rust-lang/rust/pull/69145
730 Version 1.41.0 (2020-01-30)
731 ===========================
736 - [You can now pass type parameters to foreign items when implementing
737 traits.][65879] E.g. You can now write `impl<T> From<Foo> for Vec<T> {}`.
738 - [You can now arbitrarily nest receiver types in the `self` position.][64325] E.g. you can
739 now write `fn foo(self: Box<Box<Self>>) {}`. Previously only `Self`, `&Self`,
740 `&mut Self`, `Arc<Self>`, `Rc<Self>`, and `Box<Self>` were allowed.
741 - [You can now use any valid identifier in a `format_args` macro.][66847]
742 Previously identifiers starting with an underscore were not allowed.
743 - [Visibility modifiers (e.g. `pub`) are now syntactically allowed on trait items and
744 enum variants.][66183] These are still rejected semantically, but
745 can be seen and parsed by procedural macros and conditional compilation.
750 - [Rustc will now warn if you have unused loop `'label`s.][66325]
751 - [Removed support for the `i686-unknown-dragonfly` target.][67255]
752 - [Added tier 3 support\* for the `riscv64gc-unknown-linux-gnu` target.][66661]
753 - [You can now pass an arguments file passing the `@path` syntax
754 to rustc.][66172] Note that the format differs somewhat from what is
755 found in other tooling; please see [the documentation][argfile-docs] for
757 - [You can now provide `--extern` flag without a path, indicating that it is
758 available from the search path or specified with an `-L` flag.][64882]
760 \* Refer to Rust's [platform support page][forge-platform-support] for more
761 information on Rust's tiered platform support.
763 [argfile-docs]: https://doc.rust-lang.org/nightly/rustc/command-line-arguments.html#path-load-command-line-flags-from-a-path
768 - [The `core::panic` module is now stable.][66771] It was already stable
770 - [`NonZero*` numerics now implement `From<NonZero*>` if it's a smaller integer
771 width.][66277] E.g. `NonZeroU16` now implements `From<NonZeroU8>`.
772 - [`MaybeUninit<T>` now implements `fmt::Debug`.][65013]
778 - [`Result::map_or_else`]
779 - [`std::rc::Weak::weak_count`]
780 - [`std::rc::Weak::strong_count`]
781 - [`std::sync::Weak::weak_count`]
782 - [`std::sync::Weak::strong_count`]
787 - [Cargo will now document all the private items for binary crates
788 by default.][cargo/7593]
789 - [`cargo-install` will now reinstall the package if it detects that it is out
790 of date.][cargo/7560]
791 - [Cargo.lock now uses a more git friendly format that should help to reduce
792 merge conflicts.][cargo/7579]
793 - [You can now override specific dependencies's build settings][cargo/7591] E.g.
794 `[profile.dev.package.image] opt-level = 2` sets the `image` crate's
795 optimisation level to `2` for debug builds. You can also use
796 `[profile.<profile>.build-override]` to override build scripts and
802 - [You can now specify `edition` in documentation code blocks to compile the block
803 for that edition.][66238] E.g. `edition2018` tells rustdoc that the code sample
804 should be compiled the 2018 edition of Rust.
805 - [You can now provide custom themes to rustdoc with `--theme`, and check the
806 current theme with `--check-theme`.][54733]
807 - [You can use `#[cfg(doc)]` to compile an item when building documentation.][61351]
812 - [As previously announced 1.41.0 will be the last tier 1 release for 32-bit
813 Apple targets.][apple-32bit-drop] This means that the source code is still
814 available to build, but the targets are no longer being tested and release
815 binaries for those platforms will no longer be distributed by the Rust project.
816 Please refer to the linked blog post for more information.
818 [54733]: https://github.com/rust-lang/rust/pull/54733/
819 [61351]: https://github.com/rust-lang/rust/pull/61351/
820 [67255]: https://github.com/rust-lang/rust/pull/67255/
821 [66661]: https://github.com/rust-lang/rust/pull/66661/
822 [66771]: https://github.com/rust-lang/rust/pull/66771/
823 [66847]: https://github.com/rust-lang/rust/pull/66847/
824 [66238]: https://github.com/rust-lang/rust/pull/66238/
825 [66277]: https://github.com/rust-lang/rust/pull/66277/
826 [66325]: https://github.com/rust-lang/rust/pull/66325/
827 [66172]: https://github.com/rust-lang/rust/pull/66172/
828 [66183]: https://github.com/rust-lang/rust/pull/66183/
829 [65879]: https://github.com/rust-lang/rust/pull/65879/
830 [65013]: https://github.com/rust-lang/rust/pull/65013/
831 [64882]: https://github.com/rust-lang/rust/pull/64882/
832 [64325]: https://github.com/rust-lang/rust/pull/64325/
833 [cargo/7560]: https://github.com/rust-lang/cargo/pull/7560/
834 [cargo/7579]: https://github.com/rust-lang/cargo/pull/7579/
835 [cargo/7591]: https://github.com/rust-lang/cargo/pull/7591/
836 [cargo/7593]: https://github.com/rust-lang/cargo/pull/7593/
837 [`Result::map_or_else`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or_else
838 [`Result::map_or`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.map_or
839 [`std::rc::Weak::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.weak_count
840 [`std::rc::Weak::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Weak.html#method.strong_count
841 [`std::sync::Weak::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.weak_count
842 [`std::sync::Weak::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Weak.html#method.strong_count
843 [apple-32bit-drop]: https://blog.rust-lang.org/2020/01/03/reducing-support-for-32-bit-apple-targets.html
845 Version 1.40.0 (2019-12-19)
846 ===========================
850 - [You can now use tuple `struct`s and tuple `enum` variant's constructors in
851 `const` contexts.][65188] e.g.
854 pub struct Point(i32, i32);
856 const ORIGIN: Point = {
857 let constructor = Point;
863 - [You can now mark `struct`s, `enum`s, and `enum` variants with the `#[non_exhaustive]` attribute to
864 indicate that there may be variants or fields added in the future.][64639]
865 For example this requires adding a wild-card branch (`_ => {}`) to any match
866 statements on a non-exhaustive `enum`. [(RFC 2008)]
867 - [You can now use function-like procedural macros in `extern` blocks and in
868 type positions.][63931] e.g. `type Generated = macro!();`
869 - [Function-like and attribute procedural macros can now emit
870 `macro_rules!` items, so you can now have your macros generate macros.][64035]
871 - [The `meta` pattern matcher in `macro_rules!` now correctly matches the modern
872 attribute syntax.][63674] For example `(#[$m:meta])` now matches `#[attr]`,
873 `#[attr{tokens}]`, `#[attr[tokens]]`, and `#[attr(tokens)]`.
877 - [Added tier 3 support\* for the
878 `thumbv7neon-unknown-linux-musleabihf` target.][66103]
879 - [Added tier 3 support for the
880 `aarch64-unknown-none-softfloat` target.][64589]
881 - [Added tier 3 support for the `mips64-unknown-linux-muslabi64`, and
882 `mips64el-unknown-linux-muslabi64` targets.][65843]
884 \* Refer to Rust's [platform support page][forge-platform-support] for more
885 information on Rust's tiered platform support.
889 - [The `is_power_of_two` method on unsigned numeric types is now a `const` function.][65092]
893 - [`BTreeMap::get_key_value`]
894 - [`HashMap::get_key_value`]
895 - [`Option::as_deref_mut`]
896 - [`Option::as_deref`]
897 - [`Option::flatten`]
898 - [`UdpSocket::peer_addr`]
899 - [`f32::to_be_bytes`]
900 - [`f32::to_le_bytes`]
901 - [`f32::to_ne_bytes`]
902 - [`f64::to_be_bytes`]
903 - [`f64::to_le_bytes`]
904 - [`f64::to_ne_bytes`]
905 - [`f32::from_be_bytes`]
906 - [`f32::from_le_bytes`]
907 - [`f32::from_ne_bytes`]
908 - [`f64::from_be_bytes`]
909 - [`f64::from_le_bytes`]
910 - [`f64::from_ne_bytes`]
917 - [Cargo will now always display warnings, rather than only on
918 fresh builds.][cargo/7450]
919 - [Feature flags (except `--all-features`) passed to a virtual workspace will
920 now produce an error.][cargo/7507] Previously these flags were ignored.
921 - [You can now publish `dev-dependencies` without including
922 a `version`.][cargo/7333]
926 - [You can now specify the `#[cfg(doctest)]` attribute to include an item only
927 when running documentation tests with `rustdoc`.][63803]
931 - [As previously announced, any previous NLL warnings in the 2015 edition are
932 now hard errors.][64221]
933 - [The `include!` macro will now warn if it failed to include the
934 entire file.][64284] The `include!` macro unintentionally only includes the
935 first _expression_ in a file, and this can be unintuitive. This will become
936 either a hard error in a future release, or the behavior may be fixed to include all expressions as expected.
937 - [Using `#[inline]` on function prototypes and consts now emits a warning under
938 `unused_attribute` lint.][65294] Using `#[inline]` anywhere else inside traits
939 or `extern` blocks now correctly emits a hard error.
941 [65294]: https://github.com/rust-lang/rust/pull/65294/
942 [66103]: https://github.com/rust-lang/rust/pull/66103/
943 [65843]: https://github.com/rust-lang/rust/pull/65843/
944 [65188]: https://github.com/rust-lang/rust/pull/65188/
945 [65092]: https://github.com/rust-lang/rust/pull/65092/
946 [64589]: https://github.com/rust-lang/rust/pull/64589/
947 [64639]: https://github.com/rust-lang/rust/pull/64639/
948 [64221]: https://github.com/rust-lang/rust/pull/64221/
949 [64284]: https://github.com/rust-lang/rust/pull/64284/
950 [63931]: https://github.com/rust-lang/rust/pull/63931/
951 [64035]: https://github.com/rust-lang/rust/pull/64035/
952 [63674]: https://github.com/rust-lang/rust/pull/63674/
953 [63803]: https://github.com/rust-lang/rust/pull/63803/
954 [cargo/7450]: https://github.com/rust-lang/cargo/pull/7450/
955 [cargo/7507]: https://github.com/rust-lang/cargo/pull/7507/
956 [cargo/7525]: https://github.com/rust-lang/cargo/pull/7525/
957 [cargo/7333]: https://github.com/rust-lang/cargo/pull/7333/
958 [(rfc 2008)]: https://rust-lang.github.io/rfcs/2008-non-exhaustive.html
959 [`f32::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_be_bytes
960 [`f32::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_le_bytes
961 [`f32::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_ne_bytes
962 [`f64::to_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_be_bytes
963 [`f64::to_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_le_bytes
964 [`f64::to_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_ne_bytes
965 [`f32::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_be_bytes
966 [`f32::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_le_bytes
967 [`f32::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_ne_bytes
968 [`f64::from_be_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_be_bytes
969 [`f64::from_le_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_le_bytes
970 [`f64::from_ne_bytes`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_ne_bytes
971 [`option::flatten`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.flatten
972 [`option::as_deref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref
973 [`option::as_deref_mut`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_deref_mut
974 [`hashmap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.get_key_value
975 [`btreemap::get_key_value`]: https://doc.rust-lang.org/std/collections/struct.BTreeMap.html#method.get_key_value
976 [`slice::repeat`]: https://doc.rust-lang.org/std/primitive.slice.html#method.repeat
977 [`mem::take`]: https://doc.rust-lang.org/std/mem/fn.take.html
978 [`udpsocket::peer_addr`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peer_addr
979 [`todo!`]: https://doc.rust-lang.org/std/macro.todo.html
982 Version 1.39.0 (2019-11-07)
983 ===========================
987 - [You can now create `async` functions and blocks with `async fn`, `async move {}`, and
988 `async {}` respectively, and you can now call `.await` on async expressions.][63209]
989 - [You can now use certain attributes on function, closure, and function pointer
990 parameters.][64010] These attributes include `cfg`, `cfg_attr`, `allow`, `warn`,
991 `deny`, `forbid` as well as inert helper attributes used by procedural macro
992 attributes applied to items. e.g.
995 #[cfg(windows)] slice: &[u16],
996 #[cfg(not(windows))] slice: &[u8],
1001 - [You can now take shared references to bind-by-move patterns in the `if` guards
1002 of `match` arms.][63118] e.g.
1005 let array: Box<[u8; 4]> = Box::new([1, 2, 3, 4]);
1009 // ---- `nums` is bound by move.
1010 if nums.iter().sum::<u8>() == 10
1011 // ^------ `.iter()` implicitly takes a reference to `nums`.
1014 // ----------- Legal as `nums` was bound by move and so we have ownership.
1016 _ => unreachable!(),
1025 - [Added tier 3\* support for the `i686-unknown-uefi` target.][64334]
1026 - [Added tier 3 support for the `sparc64-unknown-openbsd` target.][63595]
1027 - [rustc will now trim code snippets in diagnostics to fit in your terminal.][63402]
1028 **Note** Cargo currently doesn't use this feature. Refer to
1029 [cargo#7315][cargo/7315] to track this feature's progress.
1030 - [You can now pass `--show-output` argument to test binaries to print the
1031 output of successful tests.][62600]
1034 \* Refer to Rust's [platform support page][forge-platform-support] for more
1035 information on Rust's tiered platform support.
1039 - [`Vec::new` and `String::new` are now `const` functions.][64028]
1040 - [`LinkedList::new` is now a `const` function.][63684]
1041 - [`str::len`, `[T]::len` and `str::as_bytes` are now `const` functions.][63770]
1042 - [The `abs`, `wrapping_abs`, and `overflowing_abs` numeric functions are
1043 now `const`.][63786]
1047 - [`Pin::into_inner`]
1048 - [`Instant::checked_duration_since`]
1049 - [`Instant::saturating_duration_since`]
1053 - [You can now publish git dependencies if supplied with a `version`.][cargo/7237]
1054 - [The `--all` flag has been renamed to `--workspace`.][cargo/7241] Using
1055 `--all` is now deprecated.
1059 - [You can now pass `-Clinker` to rustdoc to control the linker used
1060 for compiling doctests.][63834]
1064 - [Code that was previously accepted by the old borrow checker, but rejected by
1065 the NLL borrow checker is now a hard error in Rust 2018.][63565] This was
1066 previously a warning, and will also become a hard error in the Rust 2015
1067 edition in the 1.40.0 release.
1068 - [`rustdoc` now requires `rustc` to be installed and in the same directory to
1069 run tests.][63827] This should improve performance when running a large
1071 - [The `try!` macro will now issue a deprecation warning.][62672] It is
1072 recommended to use the `?` operator instead.
1073 - [`asinh(-0.0)` now correctly returns `-0.0`.][63698] Previously this
1076 [62600]: https://github.com/rust-lang/rust/pull/62600/
1077 [62672]: https://github.com/rust-lang/rust/pull/62672/
1078 [63118]: https://github.com/rust-lang/rust/pull/63118/
1079 [63209]: https://github.com/rust-lang/rust/pull/63209/
1080 [63402]: https://github.com/rust-lang/rust/pull/63402/
1081 [63565]: https://github.com/rust-lang/rust/pull/63565/
1082 [63595]: https://github.com/rust-lang/rust/pull/63595/
1083 [63684]: https://github.com/rust-lang/rust/pull/63684/
1084 [63698]: https://github.com/rust-lang/rust/pull/63698/
1085 [63770]: https://github.com/rust-lang/rust/pull/63770/
1086 [63786]: https://github.com/rust-lang/rust/pull/63786/
1087 [63827]: https://github.com/rust-lang/rust/pull/63827/
1088 [63834]: https://github.com/rust-lang/rust/pull/63834/
1089 [63927]: https://github.com/rust-lang/rust/pull/63927/
1090 [63933]: https://github.com/rust-lang/rust/pull/63933/
1091 [63934]: https://github.com/rust-lang/rust/pull/63934/
1092 [63938]: https://github.com/rust-lang/rust/pull/63938/
1093 [63940]: https://github.com/rust-lang/rust/pull/63940/
1094 [63941]: https://github.com/rust-lang/rust/pull/63941/
1095 [63945]: https://github.com/rust-lang/rust/pull/63945/
1096 [64010]: https://github.com/rust-lang/rust/pull/64010/
1097 [64028]: https://github.com/rust-lang/rust/pull/64028/
1098 [64334]: https://github.com/rust-lang/rust/pull/64334/
1099 [cargo/7237]: https://github.com/rust-lang/cargo/pull/7237/
1100 [cargo/7241]: https://github.com/rust-lang/cargo/pull/7241/
1101 [cargo/7315]: https://github.com/rust-lang/cargo/pull/7315/
1102 [`Pin::into_inner`]: https://doc.rust-lang.org/std/pin/struct.Pin.html#method.into_inner
1103 [`Instant::checked_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_duration_since
1104 [`Instant::saturating_duration_since`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.saturating_duration_since
1106 Version 1.38.0 (2019-09-26)
1107 ==========================
1111 - [The `#[global_allocator]` attribute can now be used in submodules.][62735]
1112 - [The `#[deprecated]` attribute can now be used on macros.][62042]
1116 - [Added pipelined compilation support to `rustc`.][62766] This will
1117 improve compilation times in some cases. For further information please refer
1118 to the [_"Evaluating pipelined rustc compilation"_][pipeline-internals] thread.
1119 - [Added tier 3\* support for the `aarch64-uwp-windows-msvc`, `i686-uwp-windows-gnu`,
1120 `i686-uwp-windows-msvc`, `x86_64-uwp-windows-gnu`, and
1121 `x86_64-uwp-windows-msvc` targets.][60260]
1122 - [Added tier 3 support for the `armv7-unknown-linux-gnueabi` and
1123 `armv7-unknown-linux-musleabi` targets.][63107]
1124 - [Added tier 3 support for the `hexagon-unknown-linux-musl` target.][62814]
1125 - [Added tier 3 support for the `riscv32i-unknown-none-elf` target.][62784]
1127 \* Refer to Rust's [platform support page][forge-platform-support] for more
1128 information on Rust's tiered platform support.
1132 - [`ascii::EscapeDefault` now implements `Clone` and `Display`.][63421]
1133 - [Derive macros for prelude traits (e.g. `Clone`, `Debug`, `Hash`) are now
1134 available at the same path as the trait.][63056] (e.g. The `Clone` derive macro
1135 is available at `std::clone::Clone`). This also makes all built-in macros
1136 available in `std`/`core` root. e.g. `std::include_bytes!`.
1137 - [`str::Chars` now implements `Debug`.][63000]
1138 - [`slice::{concat, connect, join}` now accepts `&[T]` in addition to `&T`.][62528]
1139 - [`*const T` and `*mut T` now implement `marker::Unpin`.][62583]
1140 - [`Arc<[T]>` and `Rc<[T]>` now implement `FromIterator<T>`.][61953]
1141 - [Added euclidean remainder and division operations (`div_euclid`,
1142 `rem_euclid`) to all numeric primitives.][61884] Additionally `checked`,
1143 `overflowing`, and `wrapping` versions are available for all
1145 - [`thread::AccessError` now implements `Clone`, `Copy`, `Eq`, `Error`, and
1146 `PartialEq`.][61491]
1147 - [`iter::{StepBy, Peekable, Take}` now implement `DoubleEndedIterator`.][61457]
1151 - [`<*const T>::cast`]
1152 - [`<*mut T>::cast`]
1153 - [`Duration::as_secs_f32`]
1154 - [`Duration::as_secs_f64`]
1155 - [`Duration::div_f32`]
1156 - [`Duration::div_f64`]
1157 - [`Duration::from_secs_f32`]
1158 - [`Duration::from_secs_f64`]
1159 - [`Duration::mul_f32`]
1160 - [`Duration::mul_f64`]
1161 - [`any::type_name`]
1165 - [Added pipelined compilation support to `cargo`.][cargo/7143]
1166 - [You can now pass the `--features` option multiple times to enable
1167 multiple features.][cargo/7084]
1171 - [`rustc` will now warn about some incorrect uses of
1172 `mem::{uninitialized, zeroed}` that are known to cause undefined behaviour.][63346]
1176 - The [`x86_64-unknown-uefi` platform can not be built][62785] with rustc
1178 - The [`armv7-unknown-linux-gnueabihf` platform is known to have
1179 issues][62896] with certain crates such as libc.
1181 [60260]: https://github.com/rust-lang/rust/pull/60260/
1182 [61457]: https://github.com/rust-lang/rust/pull/61457/
1183 [61491]: https://github.com/rust-lang/rust/pull/61491/
1184 [61884]: https://github.com/rust-lang/rust/pull/61884/
1185 [61953]: https://github.com/rust-lang/rust/pull/61953/
1186 [62042]: https://github.com/rust-lang/rust/pull/62042/
1187 [62528]: https://github.com/rust-lang/rust/pull/62528/
1188 [62583]: https://github.com/rust-lang/rust/pull/62583/
1189 [62735]: https://github.com/rust-lang/rust/pull/62735/
1190 [62766]: https://github.com/rust-lang/rust/pull/62766/
1191 [62784]: https://github.com/rust-lang/rust/pull/62784/
1192 [62785]: https://github.com/rust-lang/rust/issues/62785/
1193 [62814]: https://github.com/rust-lang/rust/pull/62814/
1194 [62896]: https://github.com/rust-lang/rust/issues/62896/
1195 [63000]: https://github.com/rust-lang/rust/pull/63000/
1196 [63056]: https://github.com/rust-lang/rust/pull/63056/
1197 [63107]: https://github.com/rust-lang/rust/pull/63107/
1198 [63346]: https://github.com/rust-lang/rust/pull/63346/
1199 [63421]: https://github.com/rust-lang/rust/pull/63421/
1200 [cargo/7084]: https://github.com/rust-lang/cargo/pull/7084/
1201 [cargo/7143]: https://github.com/rust-lang/cargo/pull/7143/
1202 [`<*const T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1203 [`<*mut T>::cast`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.cast
1204 [`Duration::as_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f32
1205 [`Duration::as_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs_f64
1206 [`Duration::div_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f32
1207 [`Duration::div_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.div_f64
1208 [`Duration::from_secs_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f32
1209 [`Duration::from_secs_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_secs_f64
1210 [`Duration::mul_f32`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f32
1211 [`Duration::mul_f64`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.mul_f64
1212 [`any::type_name`]: https://doc.rust-lang.org/std/any/fn.type_name.html
1213 [forge-platform-support]: https://forge.rust-lang.org/release/platform-support.html
1214 [pipeline-internals]: https://internals.rust-lang.org/t/evaluating-pipelined-rustc-compilation/10199
1216 Version 1.37.0 (2019-08-15)
1217 ==========================
1221 - `#[must_use]` will now warn if the type is contained in a [tuple][61100],
1222 [`Box`][62228], or an [array][62235] and unused.
1223 - [You can now use the `cfg` and `cfg_attr` attributes on
1224 generic parameters.][61547]
1225 - [You can now use enum variants through type alias.][61682] e.g. You can
1226 write the following:
1228 type MyOption = Option<u8>;
1230 fn increment_or_zero(x: MyOption) -> u8 {
1232 MyOption::Some(y) => y + 1,
1233 MyOption::None => 0,
1237 - [You can now use `_` as an identifier for consts.][61347] e.g. You can write
1238 `const _: u32 = 5;`.
1239 - [You can now use `#[repr(align(X)]` on enums.][61229]
1240 - [The `?` Kleene macro operator is now available in the
1241 2015 edition.][60932]
1245 - [You can now enable Profile-Guided Optimization with the `-C profile-generate`
1246 and `-C profile-use` flags.][61268] For more information on how to use profile
1247 guided optimization, please refer to the [rustc book][rustc-book-pgo].
1248 - [The `rust-lldb` wrapper script should now work again.][61827]
1252 - [`mem::MaybeUninit<T>` is now ABI-compatible with `T`.][61802]
1256 - [`BufReader::buffer`]
1257 - [`BufWriter::buffer`]
1258 - [`Cell::from_mut`]
1259 - [`Cell<[T]>::as_slice_of_cells`][`Cell<slice>::as_slice_of_cells`]
1260 - [`DoubleEndedIterator::nth_back`]
1262 - [`Wrapping::reverse_bits`]
1263 - [`i128::reverse_bits`]
1264 - [`i16::reverse_bits`]
1265 - [`i32::reverse_bits`]
1266 - [`i64::reverse_bits`]
1267 - [`i8::reverse_bits`]
1268 - [`isize::reverse_bits`]
1269 - [`slice::copy_within`]
1270 - [`u128::reverse_bits`]
1271 - [`u16::reverse_bits`]
1272 - [`u32::reverse_bits`]
1273 - [`u64::reverse_bits`]
1274 - [`u8::reverse_bits`]
1275 - [`usize::reverse_bits`]
1279 - [`Cargo.lock` files are now included by default when publishing executable crates
1280 with executables.][cargo/7026]
1281 - [You can now specify `default-run="foo"` in `[package]` to specify the
1282 default executable to use for `cargo run`.][cargo/7056]
1289 - [Using `...` for inclusive range patterns will now warn by default.][61342]
1290 Please transition your code to using the `..=` syntax for inclusive
1292 - [Using a trait object without the `dyn` will now warn by default.][61203]
1293 Please transition your code to use `dyn Trait` for trait objects instead.
1295 [62228]: https://github.com/rust-lang/rust/pull/62228/
1296 [62235]: https://github.com/rust-lang/rust/pull/62235/
1297 [61802]: https://github.com/rust-lang/rust/pull/61802/
1298 [61827]: https://github.com/rust-lang/rust/pull/61827/
1299 [61547]: https://github.com/rust-lang/rust/pull/61547/
1300 [61682]: https://github.com/rust-lang/rust/pull/61682/
1301 [61268]: https://github.com/rust-lang/rust/pull/61268/
1302 [61342]: https://github.com/rust-lang/rust/pull/61342/
1303 [61347]: https://github.com/rust-lang/rust/pull/61347/
1304 [61100]: https://github.com/rust-lang/rust/pull/61100/
1305 [61203]: https://github.com/rust-lang/rust/pull/61203/
1306 [61229]: https://github.com/rust-lang/rust/pull/61229/
1307 [60932]: https://github.com/rust-lang/rust/pull/60932/
1308 [cargo/7026]: https://github.com/rust-lang/cargo/pull/7026/
1309 [cargo/7056]: https://github.com/rust-lang/cargo/pull/7056/
1310 [`BufReader::buffer`]: https://doc.rust-lang.org/std/io/struct.BufReader.html#method.buffer
1311 [`BufWriter::buffer`]: https://doc.rust-lang.org/std/io/struct.BufWriter.html#method.buffer
1312 [`Cell::from_mut`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.from_mut
1313 [`Cell<slice>::as_slice_of_cells`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_slice_of_cells
1314 [`DoubleEndedIterator::nth_back`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.nth_back
1315 [`Option::xor`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.xor
1316 [`RefCell::try_borrow_unguarded`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_unguarded
1317 [`Wrapping::reverse_bits`]: https://doc.rust-lang.org/std/num/struct.Wrapping.html#method.reverse_bits
1318 [`i128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i128.html#method.reverse_bits
1319 [`i16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i16.html#method.reverse_bits
1320 [`i32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i32.html#method.reverse_bits
1321 [`i64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i64.html#method.reverse_bits
1322 [`i8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.i8.html#method.reverse_bits
1323 [`isize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.isize.html#method.reverse_bits
1324 [`slice::copy_within`]: https://doc.rust-lang.org/std/primitive.slice.html#method.copy_within
1325 [`u128::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u128.html#method.reverse_bits
1326 [`u16::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u16.html#method.reverse_bits
1327 [`u32::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u32.html#method.reverse_bits
1328 [`u64::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u64.html#method.reverse_bits
1329 [`u8::reverse_bits`]: https://doc.rust-lang.org/std/primitive.u8.html#method.reverse_bits
1330 [`usize::reverse_bits`]: https://doc.rust-lang.org/std/primitive.usize.html#method.reverse_bits
1331 [rustc-book-pgo]: https://doc.rust-lang.org/rustc/profile-guided-optimization.html
1334 Version 1.36.0 (2019-07-04)
1335 ==========================
1339 - [Non-Lexical Lifetimes are now enabled on the 2015 edition.][59114]
1340 - [The order of traits in trait objects no longer affects the semantics of that
1341 object.][59445] e.g. `dyn Send + fmt::Debug` is now equivalent to
1342 `dyn fmt::Debug + Send`, where this was previously not the case.
1346 - [`HashMap`'s implementation has been replaced with `hashbrown::HashMap` implementation.][58623]
1347 - [`TryFromSliceError` now implements `From<Infallible>`.][60318]
1348 - [`mem::needs_drop` is now available as a const fn.][60364]
1349 - [`alloc::Layout::from_size_align_unchecked` is now available as a const fn.][60370]
1350 - [`String` now implements `BorrowMut<str>`.][60404]
1351 - [`io::Cursor` now implements `Default`.][60234]
1352 - [Both `NonNull::{dangling, cast}` are now const fns.][60244]
1353 - [The `alloc` crate is now stable.][59675] `alloc` allows you to use a subset
1354 of `std` (e.g. `Vec`, `Box`, `Arc`) in `#![no_std]` environments if the
1355 environment has access to heap memory allocation.
1356 - [`String` now implements `From<&String>`.][59825]
1357 - [You can now pass multiple arguments to the `dbg!` macro.][59826] `dbg!` will
1358 return a tuple of each argument when there is multiple arguments.
1359 - [`Result::{is_err, is_ok}` are now `#[must_use]` and will produce a warning if
1364 - [`VecDeque::rotate_left`]
1365 - [`VecDeque::rotate_right`]
1366 - [`Iterator::copied`]
1368 - [`io::IoSliceMut`]
1369 - [`Read::read_vectored`]
1370 - [`Write::write_vectored`]
1371 - [`str::as_mut_ptr`]
1372 - [`mem::MaybeUninit`]
1373 - [`pointer::align_offset`]
1374 - [`future::Future`]
1376 - [`task::RawWaker`]
1377 - [`task::RawWakerVTable`]
1383 - [Cargo will now produce an error if you attempt to use the name of a required dependency as a feature.][cargo/6860]
1384 - [You can now pass the `--offline` flag to run cargo without accessing the network.][cargo/6934]
1386 You can find further change's in [Cargo's 1.36.0 release notes][cargo-1-36-0].
1390 There have been numerous additions and fixes to clippy, see [Clippy's 1.36.0 release notes][clippy-1-36-0] for more details.
1397 - With the stabilisation of `mem::MaybeUninit`, `mem::uninitialized` use is no
1398 longer recommended, and will be deprecated in 1.39.0.
1400 [60318]: https://github.com/rust-lang/rust/pull/60318/
1401 [60364]: https://github.com/rust-lang/rust/pull/60364/
1402 [60370]: https://github.com/rust-lang/rust/pull/60370/
1403 [60404]: https://github.com/rust-lang/rust/pull/60404/
1404 [60234]: https://github.com/rust-lang/rust/pull/60234/
1405 [60244]: https://github.com/rust-lang/rust/pull/60244/
1406 [58623]: https://github.com/rust-lang/rust/pull/58623/
1407 [59648]: https://github.com/rust-lang/rust/pull/59648/
1408 [59675]: https://github.com/rust-lang/rust/pull/59675/
1409 [59825]: https://github.com/rust-lang/rust/pull/59825/
1410 [59826]: https://github.com/rust-lang/rust/pull/59826/
1411 [59445]: https://github.com/rust-lang/rust/pull/59445/
1412 [59114]: https://github.com/rust-lang/rust/pull/59114/
1413 [cargo/6860]: https://github.com/rust-lang/cargo/pull/6860/
1414 [cargo/6934]: https://github.com/rust-lang/cargo/pull/6934/
1415 [`VecDeque::rotate_left`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_left
1416 [`VecDeque::rotate_right`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.rotate_right
1417 [`Iterator::copied`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.copied
1418 [`io::IoSlice`]: https://doc.rust-lang.org/std/io/struct.IoSlice.html
1419 [`io::IoSliceMut`]: https://doc.rust-lang.org/std/io/struct.IoSliceMut.html
1420 [`Read::read_vectored`]: https://doc.rust-lang.org/std/io/trait.Read.html#method.read_vectored
1421 [`Write::write_vectored`]: https://doc.rust-lang.org/std/io/trait.Write.html#method.write_vectored
1422 [`str::as_mut_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_mut_ptr
1423 [`mem::MaybeUninit`]: https://doc.rust-lang.org/std/mem/union.MaybeUninit.html
1424 [`pointer::align_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.align_offset
1425 [`future::Future`]: https://doc.rust-lang.org/std/future/trait.Future.html
1426 [`task::Context`]: https://doc.rust-lang.org/beta/std/task/struct.Context.html
1427 [`task::RawWaker`]: https://doc.rust-lang.org/beta/std/task/struct.RawWaker.html
1428 [`task::RawWakerVTable`]: https://doc.rust-lang.org/beta/std/task/struct.RawWakerVTable.html
1429 [`task::Waker`]: https://doc.rust-lang.org/beta/std/task/struct.Waker.html
1430 [`task::Poll`]: https://doc.rust-lang.org/beta/std/task/enum.Poll.html
1431 [clippy-1-36-0]: https://github.com/rust-lang/rust-clippy/blob/master/CHANGELOG.md#rust-136
1432 [cargo-1-36-0]: https://github.com/rust-lang/cargo/blob/master/CHANGELOG.md#cargo-136-2019-07-04
1435 Version 1.35.0 (2019-05-23)
1436 ==========================
1440 - [`FnOnce`, `FnMut`, and the `Fn` traits are now implemented for `Box<FnOnce>`,
1441 `Box<FnMut>`, and `Box<Fn>` respectively.][59500]
1442 - [You can now coerce closures into unsafe function pointers.][59580] e.g.
1444 unsafe fn call_unsafe(func: unsafe fn()) {
1449 unsafe { call_unsafe(|| {}); }
1456 - [Added the `armv6-unknown-freebsd-gnueabihf` and
1457 `armv7-unknown-freebsd-gnueabihf` targets.][58080]
1458 - [Added the `wasm32-unknown-wasi` target.][59464]
1463 - [`Thread` will now show its ID in `Debug` output.][59460]
1464 - [`StdinLock`, `StdoutLock`, and `StderrLock` now implement `AsRawFd`.][59512]
1465 - [`alloc::System` now implements `Default`.][59451]
1466 - [Expanded `Debug` output (`{:#?}`) for structs now has a trailing comma on the
1468 - [`char::{ToLowercase, ToUppercase}` now
1469 implement `ExactSizeIterator`.][58778]
1470 - [All `NonZero` numeric types now implement `FromStr`.][58717]
1471 - [Removed the `Read` trait bounds
1472 on the `BufReader::{get_ref, get_mut, into_inner}` methods.][58423]
1473 - [You can now call the `dbg!` macro without any parameters to print the file
1474 and line where it is called.][57847]
1475 - [In place ASCII case conversions are now up to 4× faster.][59283]
1476 e.g. `str::make_ascii_lowercase`
1477 - [`hash_map::{OccupiedEntry, VacantEntry}` now implement `Sync`
1484 - [`RefCell::replace_with`]
1485 - [`RefCell::map_split`]
1487 - [`Range::contains`]
1488 - [`RangeFrom::contains`]
1489 - [`RangeTo::contains`]
1490 - [`RangeInclusive::contains`]
1491 - [`RangeToInclusive::contains`]
1492 - [`Option::copied`]
1496 - [You can now set `cargo:rustc-cdylib-link-arg` at build time to pass custom
1497 linker arguments when building a `cdylib`.][cargo/6298] Its usage is highly
1502 - [The Rust toolchain is now available natively for musl based distros.][58575]
1504 [59460]: https://github.com/rust-lang/rust/pull/59460/
1505 [59464]: https://github.com/rust-lang/rust/pull/59464/
1506 [59500]: https://github.com/rust-lang/rust/pull/59500/
1507 [59512]: https://github.com/rust-lang/rust/pull/59512/
1508 [59580]: https://github.com/rust-lang/rust/pull/59580/
1509 [59283]: https://github.com/rust-lang/rust/pull/59283/
1510 [59451]: https://github.com/rust-lang/rust/pull/59451/
1511 [59076]: https://github.com/rust-lang/rust/pull/59076/
1512 [58778]: https://github.com/rust-lang/rust/pull/58778/
1513 [58717]: https://github.com/rust-lang/rust/pull/58717/
1514 [58369]: https://github.com/rust-lang/rust/pull/58369/
1515 [58423]: https://github.com/rust-lang/rust/pull/58423/
1516 [58080]: https://github.com/rust-lang/rust/pull/58080/
1517 [57847]: https://github.com/rust-lang/rust/pull/57847/
1518 [58575]: https://github.com/rust-lang/rust/pull/58575
1519 [cargo/6298]: https://github.com/rust-lang/cargo/pull/6298/
1520 [`f32::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f32.html#method.copysign
1521 [`f64::copysign`]: https://doc.rust-lang.org/stable/std/primitive.f64.html#method.copysign
1522 [`RefCell::replace_with`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.replace_with
1523 [`RefCell::map_split`]: https://doc.rust-lang.org/stable/std/cell/struct.RefCell.html#method.map_split
1524 [`ptr::hash`]: https://doc.rust-lang.org/stable/std/ptr/fn.hash.html
1525 [`Range::contains`]: https://doc.rust-lang.org/std/ops/struct.Range.html#method.contains
1526 [`RangeFrom::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeFrom.html#method.contains
1527 [`RangeTo::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeTo.html#method.contains
1528 [`RangeInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.contains
1529 [`RangeToInclusive::contains`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html#method.contains
1530 [`Option::copied`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.copied
1532 Version 1.34.2 (2019-05-14)
1533 ===========================
1535 * [Destabilize the `Error::type_id` function due to a security
1536 vulnerability][60785] ([CVE-2019-12083])
1538 [60785]: https://github.com/rust-lang/rust/pull/60785
1539 [CVE-2019-12083]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12083
1541 Version 1.34.1 (2019-04-25)
1542 ===========================
1544 * [Fix false positives for the `redundant_closure` Clippy lint][clippy/3821]
1545 * [Fix false positives for the `missing_const_for_fn` Clippy lint][clippy/3844]
1546 * [Fix Clippy panic when checking some macros][clippy/3805]
1548 [clippy/3821]: https://github.com/rust-lang/rust-clippy/pull/3821
1549 [clippy/3844]: https://github.com/rust-lang/rust-clippy/pull/3844
1550 [clippy/3805]: https://github.com/rust-lang/rust-clippy/pull/3805
1552 Version 1.34.0 (2019-04-11)
1553 ==========================
1557 - [You can now use `#[deprecated = "reason"]`][58166] as a shorthand for
1558 `#[deprecated(note = "reason")]`. This was previously allowed by mistake
1560 - [You can now accept token streams in `#[attr()]`,`#[attr[]]`, and
1561 `#[attr{}]` procedural macros.][57367]
1562 - [You can now write `extern crate self as foo;`][57407] to import your
1563 crate's root into the extern prelude.
1568 - [You can now target `riscv64imac-unknown-none-elf` and
1569 `riscv64gc-unknown-none-elf`.][58406]
1570 - [You can now enable linker plugin LTO optimisations with
1571 `-C linker-plugin-lto`.][58057] This allows rustc to compile your Rust code
1572 into LLVM bitcode allowing LLVM to perform LTO optimisations across C/C++ FFI
1574 - [You can now target `powerpc64-unknown-freebsd`.][57809]
1579 - [The trait bounds have been removed on some of `HashMap<K, V, S>`'s and
1580 `HashSet<T, S>`'s basic methods.][58370] Most notably you no longer require
1581 the `Hash` trait to create an iterator.
1582 - [The `Ord` trait bounds have been removed on some of `BinaryHeap<T>`'s basic
1583 methods.][58421] Most notably you no longer require the `Ord` trait to create
1585 - [The methods `overflowing_neg` and `wrapping_neg` are now `const` functions
1586 for all numeric types.][58044]
1587 - [Indexing a `str` is now generic over all types that
1588 implement `SliceIndex<str>`.][57604]
1589 - [`str::trim`, `str::trim_matches`, `str::trim_{start, end}`, and
1590 `str::trim_{start, end}_matches` are now `#[must_use]`][57106] and will
1591 produce a warning if their returning type is unused.
1592 - [The methods `checked_pow`, `saturating_pow`, `wrapping_pow`, and
1593 `overflowing_pow` are now available for all numeric types.][57873] These are
1594 equivalent to methods such as `wrapping_add` for the `pow` operation.
1602 * [`Error::type_id`]
1603 * [`atomic::AtomicI16`]
1604 * [`atomic::AtomicI32`]
1605 * [`atomic::AtomicI64`]
1606 * [`atomic::AtomicI8`]
1607 * [`atomic::AtomicU16`]
1608 * [`atomic::AtomicU32`]
1609 * [`atomic::AtomicU64`]
1610 * [`atomic::AtomicU8`]
1611 * [`convert::Infallible`]
1612 * [`convert::TryFrom`]
1613 * [`convert::TryInto`]
1615 * [`iter::successors`]
1616 * [`num::NonZeroI128`]
1617 * [`num::NonZeroI16`]
1618 * [`num::NonZeroI32`]
1619 * [`num::NonZeroI64`]
1620 * [`num::NonZeroI8`]
1621 * [`num::NonZeroIsize`]
1622 * [`slice::sort_by_cached_key`]
1623 * [`str::escape_debug`]
1624 * [`str::escape_default`]
1625 * [`str::escape_unicode`]
1626 * [`str::split_ascii_whitespace`]
1629 * [`Instant::checked_add`]
1630 * [`Instant::checked_sub`]
1631 * [`SystemTime::checked_add`]
1632 * [`SystemTime::checked_sub`]
1636 - [You can now use alternative registries to crates.io.][cargo/6654]
1640 - [You can now use the `?` operator in your documentation tests without manually
1641 adding `fn main() -> Result<(), _> {}`.][56470]
1645 - [`Command::before_exec` is being replaced by the unsafe method
1646 `Command::pre_exec`][58059] and will be deprecated with Rust 1.37.0.
1647 - [Use of `ATOMIC_{BOOL, ISIZE, USIZE}_INIT` is now deprecated][57425] as you
1648 can now use `const` functions in `static` variables.
1650 [58370]: https://github.com/rust-lang/rust/pull/58370/
1651 [58406]: https://github.com/rust-lang/rust/pull/58406/
1652 [58421]: https://github.com/rust-lang/rust/pull/58421/
1653 [58166]: https://github.com/rust-lang/rust/pull/58166/
1654 [58044]: https://github.com/rust-lang/rust/pull/58044/
1655 [58057]: https://github.com/rust-lang/rust/pull/58057/
1656 [58059]: https://github.com/rust-lang/rust/pull/58059/
1657 [57809]: https://github.com/rust-lang/rust/pull/57809/
1658 [57873]: https://github.com/rust-lang/rust/pull/57873/
1659 [57604]: https://github.com/rust-lang/rust/pull/57604/
1660 [57367]: https://github.com/rust-lang/rust/pull/57367/
1661 [57407]: https://github.com/rust-lang/rust/pull/57407/
1662 [57425]: https://github.com/rust-lang/rust/pull/57425/
1663 [57106]: https://github.com/rust-lang/rust/pull/57106/
1664 [56470]: https://github.com/rust-lang/rust/pull/56470/
1665 [cargo/6654]: https://github.com/rust-lang/cargo/pull/6654/
1666 [`Any::type_id`]: https://doc.rust-lang.org/std/any/trait.Any.html#tymethod.type_id
1667 [`Error::type_id`]: https://doc.rust-lang.org/std/error/trait.Error.html#method.type_id
1668 [`atomic::AtomicI16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI16.html
1669 [`atomic::AtomicI32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI32.html
1670 [`atomic::AtomicI64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI64.html
1671 [`atomic::AtomicI8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicI8.html
1672 [`atomic::AtomicU16`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU16.html
1673 [`atomic::AtomicU32`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU32.html
1674 [`atomic::AtomicU64`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU64.html
1675 [`atomic::AtomicU8`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html
1676 [`convert::Infallible`]: https://doc.rust-lang.org/std/convert/enum.Infallible.html
1677 [`convert::TryFrom`]: https://doc.rust-lang.org/std/convert/trait.TryFrom.html
1678 [`convert::TryInto`]: https://doc.rust-lang.org/std/convert/trait.TryInto.html
1679 [`iter::from_fn`]: https://doc.rust-lang.org/std/iter/fn.from_fn.html
1680 [`iter::successors`]: https://doc.rust-lang.org/std/iter/fn.successors.html
1681 [`num::NonZeroI128`]: https://doc.rust-lang.org/std/num/struct.NonZeroI128.html
1682 [`num::NonZeroI16`]: https://doc.rust-lang.org/std/num/struct.NonZeroI16.html
1683 [`num::NonZeroI32`]: https://doc.rust-lang.org/std/num/struct.NonZeroI32.html
1684 [`num::NonZeroI64`]: https://doc.rust-lang.org/std/num/struct.NonZeroI64.html
1685 [`num::NonZeroI8`]: https://doc.rust-lang.org/std/num/struct.NonZeroI8.html
1686 [`num::NonZeroIsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroIsize.html
1687 [`slice::sort_by_cached_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_by_cached_key
1688 [`str::escape_debug`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_debug
1689 [`str::escape_default`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_default
1690 [`str::escape_unicode`]: https://doc.rust-lang.org/std/primitive.str.html#method.escape_unicode
1691 [`str::split_ascii_whitespace`]: https://doc.rust-lang.org/std/primitive.str.html#method.split_ascii_whitespace
1692 [`Instant::checked_add`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_add
1693 [`Instant::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Instant.html#method.checked_sub
1694 [`SystemTime::checked_add`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_add
1695 [`SystemTime::checked_sub`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.checked_sub
1698 Version 1.33.0 (2019-02-28)
1699 ==========================
1703 - [You can now use the `cfg(target_vendor)` attribute.][57465] E.g.
1704 `#[cfg(target_vendor="apple")] fn main() { println!("Hello Apple!"); }`
1705 - [Integer patterns such as in a match expression can now be exhaustive.][56362]
1706 E.g. You can have match statement on a `u8` that covers `0..=255` and
1707 you would no longer be required to have a `_ => unreachable!()` case.
1708 - [You can now have multiple patterns in `if let` and `while let`
1709 expressions.][57532] You can do this with the same syntax as a `match`
1719 let state = Creature::Crab("Ferris");
1721 if let Creature::Crab(name) | Creature::Person(name) = state {
1722 println!("This creature's name is: {}", name);
1726 - [You can now have irrefutable `if let` and `while let` patterns.][57535] Using
1727 this feature will by default produce a warning as this behaviour can be
1728 unintuitive. E.g. `if let _ = 5 {}`
1729 - [You can now use `let` bindings, assignments, expression statements,
1730 and irrefutable pattern destructuring in const functions.][57175]
1731 - [You can now call unsafe const functions.][57067] E.g.
1733 const unsafe fn foo() -> i32 { 5 }
1734 const fn bar() -> i32 {
1738 - [You can now specify multiple attributes in a `cfg_attr` attribute.][57332]
1739 E.g. `#[cfg_attr(all(), must_use, optimize)]`
1740 - [You can now specify a specific alignment with the `#[repr(packed)]`
1741 attribute.][57049] E.g. `#[repr(packed(2))] struct Foo(i16, i32);` is a struct
1742 with an alignment of 2 bytes and a size of 6 bytes.
1743 - [You can now import an item from a module as an `_`.][56303] This allows you to
1744 import a trait's impls, and not have the name in the namespace. E.g.
1746 use std::io::Read as _;
1748 // Allowed as there is only one `Read` in the module.
1751 - [You may now use `Rc`, `Arc`, and `Pin` as method receivers][56805].
1755 - [You can now set a linker flavor for `rustc` with the `-Clinker-flavor`
1756 command line argument.][56351]
1757 - [The minimum required LLVM version has been bumped to 6.0.][56642]
1758 - [Added support for the PowerPC64 architecture on FreeBSD.][57615]
1759 - [The `x86_64-fortanix-unknown-sgx` target support has been upgraded to
1760 tier 2 support.][57130] Visit the [platform support][platform-support] page for
1761 information on Rust's platform support.
1762 - [Added support for the `thumbv7neon-linux-androideabi` and
1763 `thumbv7neon-unknown-linux-gnueabihf` targets.][56947]
1764 - [Added support for the `x86_64-unknown-uefi` target.][56769]
1768 - [The methods `overflowing_{add, sub, mul, shl, shr}` are now `const`
1769 functions for all numeric types.][57566]
1770 - [The methods `rotate_left`, `rotate_right`, and `wrapping_{add, sub, mul, shl, shr}`
1771 are now `const` functions for all numeric types.][57105]
1772 - [The methods `is_positive` and `is_negative` are now `const` functions for
1773 all signed numeric types.][57105]
1774 - [The `get` method for all `NonZero` types is now `const`.][57167]
1775 - [The methods `count_ones`, `count_zeros`, `leading_zeros`, `trailing_zeros`,
1776 `swap_bytes`, `from_be`, `from_le`, `to_be`, `to_le` are now `const` for all
1777 numeric types.][57234]
1778 - [`Ipv4Addr::new` is now a `const` function][57234]
1782 - [`unix::FileExt::read_exact_at`]
1783 - [`unix::FileExt::write_all_at`]
1784 - [`Option::transpose`]
1785 - [`Result::transpose`]
1786 - [`convert::identity`]
1789 - [`marker::PhantomPinned`]
1790 - [`Vec::resize_with`]
1791 - [`VecDeque::resize_with`]
1792 - [`Duration::as_millis`]
1793 - [`Duration::as_micros`]
1794 - [`Duration::as_nanos`]
1799 - [You can now publish crates that require a feature flag to compile with
1800 `cargo publish --features` or `cargo publish --all-features`.][cargo/6453]
1801 - [Cargo should now rebuild a crate if a file was modified during the initial
1806 - The methods `str::{trim_left, trim_right, trim_left_matches, trim_right_matches}`
1807 are now deprecated in the standard library, and their usage will now produce a warning.
1808 Please use the `str::{trim_start, trim_end, trim_start_matches, trim_end_matches}`
1810 - The `Error::cause` method has been deprecated in favor of `Error::source` which supports
1812 - [Libtest no longer creates a new thread for each test when
1813 `--test-threads=1`. It also runs the tests in deterministic order][56243]
1815 [55982]: https://github.com/rust-lang/rust/pull/55982/
1816 [56243]: https://github.com/rust-lang/rust/pull/56243
1817 [56303]: https://github.com/rust-lang/rust/pull/56303/
1818 [56351]: https://github.com/rust-lang/rust/pull/56351/
1819 [56362]: https://github.com/rust-lang/rust/pull/56362
1820 [56642]: https://github.com/rust-lang/rust/pull/56642/
1821 [56769]: https://github.com/rust-lang/rust/pull/56769/
1822 [56805]: https://github.com/rust-lang/rust/pull/56805
1823 [56947]: https://github.com/rust-lang/rust/pull/56947/
1824 [57049]: https://github.com/rust-lang/rust/pull/57049/
1825 [57067]: https://github.com/rust-lang/rust/pull/57067/
1826 [57105]: https://github.com/rust-lang/rust/pull/57105
1827 [57130]: https://github.com/rust-lang/rust/pull/57130/
1828 [57167]: https://github.com/rust-lang/rust/pull/57167/
1829 [57175]: https://github.com/rust-lang/rust/pull/57175/
1830 [57234]: https://github.com/rust-lang/rust/pull/57234/
1831 [57332]: https://github.com/rust-lang/rust/pull/57332/
1832 [57465]: https://github.com/rust-lang/rust/pull/57465/
1833 [57532]: https://github.com/rust-lang/rust/pull/57532/
1834 [57535]: https://github.com/rust-lang/rust/pull/57535/
1835 [57566]: https://github.com/rust-lang/rust/pull/57566/
1836 [57615]: https://github.com/rust-lang/rust/pull/57615/
1837 [cargo/6453]: https://github.com/rust-lang/cargo/pull/6453/
1838 [cargo/6484]: https://github.com/rust-lang/cargo/pull/6484/
1839 [`unix::FileExt::read_exact_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.read_exact_at
1840 [`unix::FileExt::write_all_at`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html#method.write_all_at
1841 [`Option::transpose`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.transpose
1842 [`Result::transpose`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.transpose
1843 [`convert::identity`]: https://doc.rust-lang.org/std/convert/fn.identity.html
1844 [`pin::Pin`]: https://doc.rust-lang.org/std/pin/struct.Pin.html
1845 [`marker::Unpin`]: https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html
1846 [`marker::PhantomPinned`]: https://doc.rust-lang.org/nightly/std/marker/struct.PhantomPinned.html
1847 [`Vec::resize_with`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.resize_with
1848 [`VecDeque::resize_with`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.resize_with
1849 [`Duration::as_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_millis
1850 [`Duration::as_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_micros
1851 [`Duration::as_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_nanos
1852 [platform-support]: https://forge.rust-lang.org/platform-support.html
1854 Version 1.32.0 (2019-01-17)
1855 ==========================
1860 - [You can now use the `?` operator in macro definitions.][56245] The `?`
1861 operator allows you to specify zero or one repetitions similar to the `*` and
1863 - [Module paths with no leading keyword like `super`, `self`, or `crate`, will
1864 now always resolve to the item (`enum`, `struct`, etc.) available in the
1865 module if present, before resolving to a external crate or an item the prelude.][56759]
1868 enum Color { Red, Green, Blue }
1874 - [You can now match against `PhantomData<T>` types.][55837]
1875 - [You can now match against literals in macros with the `literal`
1876 specifier.][56072] This will match against a literal of any type.
1877 E.g. `1`, `'A'`, `"Hello World"`
1878 - [Self can now be used as a constructor and pattern for unit and tuple structs.][56365] E.g.
1880 struct Point(i32, i32);
1883 pub fn new(x: i32, y: i32) -> Self {
1887 pub fn is_origin(&self) -> bool {
1895 - [Self can also now be used in type definitions.][56366] E.g.
1899 Self: PartialOrd<Self> // can write `Self` instead of `List<T>`
1902 Cons(T, Box<Self>) // likewise here
1905 - [You can now mark traits with `#[must_use]`.][55663] This provides a warning if
1906 a `impl Trait` or `dyn Trait` is returned and unused in the program.
1910 - [The default allocator has changed from jemalloc to the default allocator on
1911 your system.][55238] The compiler itself on Linux & macOS will still use
1912 jemalloc, but programs compiled with it will use the system allocator.
1913 - [Added the `aarch64-pc-windows-msvc` target.][55702]
1917 - [`PathBuf` now implements `FromStr`.][55148]
1918 - [`Box<[T]>` now implements `FromIterator<T>`.][55843]
1919 - [The `dbg!` macro has been stabilized.][56395] This macro enables you to
1920 easily debug expressions in your rust program. E.g.
1923 let b = dbg!(a * 2) + 1;
1924 // ^-- prints: [src/main.rs:4] a * 2 = 4
1928 The following APIs are now `const` functions and can be used in a
1932 - [`UnsafeCell::get`]
1933 - [`char::is_ascii`]
1935 - [`ManuallyDrop::new`]
1936 - [`ManuallyDrop::into_inner`]
1937 - [`RangeInclusive::start`]
1938 - [`RangeInclusive::end`]
1939 - [`NonNull::as_ptr`]
1942 - [`Duration::as_secs`]
1943 - [`Duration::subsec_millis`]
1944 - [`Duration::subsec_micros`]
1945 - [`Duration::subsec_nanos`]
1947 - [`Ipv4Addr::is_unspecified`]
1949 - [`Ipv6Addr::octets`]
1953 - [`i8::to_be_bytes`]
1954 - [`i8::to_le_bytes`]
1955 - [`i8::to_ne_bytes`]
1956 - [`i8::from_be_bytes`]
1957 - [`i8::from_le_bytes`]
1958 - [`i8::from_ne_bytes`]
1959 - [`i16::to_be_bytes`]
1960 - [`i16::to_le_bytes`]
1961 - [`i16::to_ne_bytes`]
1962 - [`i16::from_be_bytes`]
1963 - [`i16::from_le_bytes`]
1964 - [`i16::from_ne_bytes`]
1965 - [`i32::to_be_bytes`]
1966 - [`i32::to_le_bytes`]
1967 - [`i32::to_ne_bytes`]
1968 - [`i32::from_be_bytes`]
1969 - [`i32::from_le_bytes`]
1970 - [`i32::from_ne_bytes`]
1971 - [`i64::to_be_bytes`]
1972 - [`i64::to_le_bytes`]
1973 - [`i64::to_ne_bytes`]
1974 - [`i64::from_be_bytes`]
1975 - [`i64::from_le_bytes`]
1976 - [`i64::from_ne_bytes`]
1977 - [`i128::to_be_bytes`]
1978 - [`i128::to_le_bytes`]
1979 - [`i128::to_ne_bytes`]
1980 - [`i128::from_be_bytes`]
1981 - [`i128::from_le_bytes`]
1982 - [`i128::from_ne_bytes`]
1983 - [`isize::to_be_bytes`]
1984 - [`isize::to_le_bytes`]
1985 - [`isize::to_ne_bytes`]
1986 - [`isize::from_be_bytes`]
1987 - [`isize::from_le_bytes`]
1988 - [`isize::from_ne_bytes`]
1989 - [`u8::to_be_bytes`]
1990 - [`u8::to_le_bytes`]
1991 - [`u8::to_ne_bytes`]
1992 - [`u8::from_be_bytes`]
1993 - [`u8::from_le_bytes`]
1994 - [`u8::from_ne_bytes`]
1995 - [`u16::to_be_bytes`]
1996 - [`u16::to_le_bytes`]
1997 - [`u16::to_ne_bytes`]
1998 - [`u16::from_be_bytes`]
1999 - [`u16::from_le_bytes`]
2000 - [`u16::from_ne_bytes`]
2001 - [`u32::to_be_bytes`]
2002 - [`u32::to_le_bytes`]
2003 - [`u32::to_ne_bytes`]
2004 - [`u32::from_be_bytes`]
2005 - [`u32::from_le_bytes`]
2006 - [`u32::from_ne_bytes`]
2007 - [`u64::to_be_bytes`]
2008 - [`u64::to_le_bytes`]
2009 - [`u64::to_ne_bytes`]
2010 - [`u64::from_be_bytes`]
2011 - [`u64::from_le_bytes`]
2012 - [`u64::from_ne_bytes`]
2013 - [`u128::to_be_bytes`]
2014 - [`u128::to_le_bytes`]
2015 - [`u128::to_ne_bytes`]
2016 - [`u128::from_be_bytes`]
2017 - [`u128::from_le_bytes`]
2018 - [`u128::from_ne_bytes`]
2019 - [`usize::to_be_bytes`]
2020 - [`usize::to_le_bytes`]
2021 - [`usize::to_ne_bytes`]
2022 - [`usize::from_be_bytes`]
2023 - [`usize::from_le_bytes`]
2024 - [`usize::from_ne_bytes`]
2028 - [You can now run `cargo c` as an alias for `cargo check`.][cargo/6218]
2029 - [Usernames are now allowed in alt registry URLs.][cargo/6242]
2033 - [`libproc_macro` has been added to the `rust-src` distribution.][55280]
2037 - [The argument types for AVX's
2038 `_mm256_stream_si256`, `_mm256_stream_pd`, `_mm256_stream_ps`][55610] have
2039 been changed from `*const` to `*mut` as the previous implementation
2043 [55148]: https://github.com/rust-lang/rust/pull/55148/
2044 [55238]: https://github.com/rust-lang/rust/pull/55238/
2045 [55280]: https://github.com/rust-lang/rust/pull/55280/
2046 [55610]: https://github.com/rust-lang/rust/pull/55610/
2047 [55663]: https://github.com/rust-lang/rust/pull/55663/
2048 [55702]: https://github.com/rust-lang/rust/pull/55702/
2049 [55837]: https://github.com/rust-lang/rust/pull/55837/
2050 [55843]: https://github.com/rust-lang/rust/pull/55843/
2051 [56072]: https://github.com/rust-lang/rust/pull/56072/
2052 [56245]: https://github.com/rust-lang/rust/pull/56245/
2053 [56365]: https://github.com/rust-lang/rust/pull/56365/
2054 [56366]: https://github.com/rust-lang/rust/pull/56366/
2055 [56395]: https://github.com/rust-lang/rust/pull/56395/
2056 [56759]: https://github.com/rust-lang/rust/pull/56759/
2057 [cargo/6218]: https://github.com/rust-lang/cargo/pull/6218/
2058 [cargo/6242]: https://github.com/rust-lang/cargo/pull/6242/
2059 [`CStr::as_ptr`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.as_ptr
2060 [`Cell::as_ptr`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr
2061 [`Duration::as_secs`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.as_secs
2062 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2063 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2064 [`Duration::subsec_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_nanos
2065 [`Ipv4Addr::is_unspecified`]: https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified
2066 [`Ipv6Addr::new`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.new
2067 [`Ipv6Addr::octets`]: https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets
2068 [`ManuallyDrop::into_inner`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.into_inner
2069 [`ManuallyDrop::new`]: https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html#method.new
2070 [`NonNull::as_ptr`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_ptr
2071 [`RangeInclusive::end`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.end
2072 [`RangeInclusive::start`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html#method.start
2073 [`UnsafeCell::get`]: https://doc.rust-lang.org/std/cell/struct.UnsafeCell.html#method.get
2074 [`slice::as_ptr`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr
2075 [`char::is_ascii`]: https://doc.rust-lang.org/std/primitive.char.html#method.is_ascii
2076 [`i128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_be_bytes
2077 [`i128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_le_bytes
2078 [`i128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.from_ne_bytes
2079 [`i128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_be_bytes
2080 [`i128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_le_bytes
2081 [`i128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i128.html#method.to_ne_bytes
2082 [`i16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_be_bytes
2083 [`i16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_le_bytes
2084 [`i16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.from_ne_bytes
2085 [`i16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_be_bytes
2086 [`i16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_le_bytes
2087 [`i16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i16.html#method.to_ne_bytes
2088 [`i32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_be_bytes
2089 [`i32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_le_bytes
2090 [`i32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.from_ne_bytes
2091 [`i32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_be_bytes
2092 [`i32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_le_bytes
2093 [`i32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i32.html#method.to_ne_bytes
2094 [`i64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_be_bytes
2095 [`i64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_le_bytes
2096 [`i64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.from_ne_bytes
2097 [`i64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_be_bytes
2098 [`i64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_le_bytes
2099 [`i64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i64.html#method.to_ne_bytes
2100 [`i8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_be_bytes
2101 [`i8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_le_bytes
2102 [`i8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.from_ne_bytes
2103 [`i8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_be_bytes
2104 [`i8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_le_bytes
2105 [`i8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.i8.html#method.to_ne_bytes
2106 [`isize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_be_bytes
2107 [`isize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_le_bytes
2108 [`isize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.from_ne_bytes
2109 [`isize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_be_bytes
2110 [`isize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_le_bytes
2111 [`isize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.isize.html#method.to_ne_bytes
2112 [`iter::empty`]: https://doc.rust-lang.org/std/iter/fn.empty.html
2113 [`str::as_ptr`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_ptr
2114 [`u128::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_be_bytes
2115 [`u128::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_le_bytes
2116 [`u128::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.from_ne_bytes
2117 [`u128::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_be_bytes
2118 [`u128::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_le_bytes
2119 [`u128::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u128.html#method.to_ne_bytes
2120 [`u16::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_be_bytes
2121 [`u16::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_le_bytes
2122 [`u16::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.from_ne_bytes
2123 [`u16::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_be_bytes
2124 [`u16::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_le_bytes
2125 [`u16::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u16.html#method.to_ne_bytes
2126 [`u32::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_be_bytes
2127 [`u32::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_le_bytes
2128 [`u32::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.from_ne_bytes
2129 [`u32::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_be_bytes
2130 [`u32::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_le_bytes
2131 [`u32::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u32.html#method.to_ne_bytes
2132 [`u64::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_be_bytes
2133 [`u64::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_le_bytes
2134 [`u64::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.from_ne_bytes
2135 [`u64::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_be_bytes
2136 [`u64::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_le_bytes
2137 [`u64::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u64.html#method.to_ne_bytes
2138 [`u8::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_be_bytes
2139 [`u8::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_le_bytes
2140 [`u8::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.from_ne_bytes
2141 [`u8::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_be_bytes
2142 [`u8::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_le_bytes
2143 [`u8::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.u8.html#method.to_ne_bytes
2144 [`usize::from_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_be_bytes
2145 [`usize::from_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_le_bytes
2146 [`usize::from_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.from_ne_bytes
2147 [`usize::to_be_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_be_bytes
2148 [`usize::to_le_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_le_bytes
2149 [`usize::to_ne_bytes`]: https://doc.rust-lang.org/stable/std/primitive.usize.html#method.to_ne_bytes
2152 Version 1.31.1 (2018-12-20)
2153 ===========================
2155 - [Fix Rust failing to build on `powerpc-unknown-netbsd`][56562]
2156 - [Fix broken go-to-definition in RLS][rls/1171]
2157 - [Fix infinite loop on hover in RLS][rls/1170]
2159 [56562]: https://github.com/rust-lang/rust/pull/56562
2160 [rls/1171]: https://github.com/rust-lang/rls/issues/1171
2161 [rls/1170]: https://github.com/rust-lang/rls/pull/1170
2163 Version 1.31.0 (2018-12-06)
2164 ==========================
2168 - 🎉 [This version marks the release of the 2018 edition of Rust.][54057] 🎉
2169 - [New lifetime elision rules now allow for eliding lifetimes in functions and
2170 impl headers.][54778] E.g. `impl<'a> Reader for BufReader<'a> {}` can now be
2171 `impl Reader for BufReader<'_> {}`. Lifetimes are still required to be defined
2173 - [You can now define and use `const` functions.][54835] These are currently
2174 a strict minimal subset of the [const fn RFC][RFC-911]. Refer to the
2175 [language reference][const-reference] for what exactly is available.
2176 - [You can now use tool lints, which allow you to scope lints from external
2177 tools using attributes.][54870] E.g. `#[allow(clippy::filter_map)]`.
2178 - [`#[no_mangle]` and `#[export_name]` attributes can now be located anywhere in
2179 a crate, not just in exported functions.][54451]
2180 - [You can now use parentheses in pattern matches.][54497]
2184 - [Updated musl to 1.1.20][54430]
2188 - [You can now convert `num::NonZero*` types to their raw equivalents using the
2189 `From` trait.][54240] E.g. `u8` now implements `From<NonZeroU8>`.
2190 - [You can now convert a `&Option<T>` into `Option<&T>` and `&mut Option<T>`
2191 into `Option<&mut T>` using the `From` trait.][53218]
2192 - [You can now multiply (`*`) a `time::Duration` by a `u32`.][52813]
2197 - [`slice::align_to`]
2198 - [`slice::align_to_mut`]
2199 - [`slice::chunks_exact`]
2200 - [`slice::chunks_exact_mut`]
2201 - [`slice::rchunks`]
2202 - [`slice::rchunks_mut`]
2203 - [`slice::rchunks_exact`]
2204 - [`slice::rchunks_exact_mut`]
2205 - [`Option::replace`]
2209 - [Cargo will now download crates in parallel using HTTP/2.][cargo/6005]
2210 - [You can now rename packages in your Cargo.toml][cargo/6319] We have a guide
2211 on [how to use the `package` key in your dependencies.][cargo-rename-reference]
2213 [52813]: https://github.com/rust-lang/rust/pull/52813/
2214 [53218]: https://github.com/rust-lang/rust/pull/53218/
2215 [53555]: https://github.com/rust-lang/rust/issues/53555/
2216 [54057]: https://github.com/rust-lang/rust/pull/54057/
2217 [54240]: https://github.com/rust-lang/rust/pull/54240/
2218 [54430]: https://github.com/rust-lang/rust/pull/54430/
2219 [54451]: https://github.com/rust-lang/rust/pull/54451/
2220 [54497]: https://github.com/rust-lang/rust/pull/54497/
2221 [54778]: https://github.com/rust-lang/rust/pull/54778/
2222 [54835]: https://github.com/rust-lang/rust/pull/54835/
2223 [54870]: https://github.com/rust-lang/rust/pull/54870/
2224 [RFC-911]: https://github.com/rust-lang/rfcs/pull/911
2225 [`Option::replace`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.replace
2226 [`slice::align_to_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to_mut
2227 [`slice::align_to`]: https://doc.rust-lang.org/std/primitive.slice.html#method.align_to
2228 [`slice::chunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact_mut
2229 [`slice::chunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.chunks_exact
2230 [`slice::rchunks_exact_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2231 [`slice::rchunks_exact`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_exact
2232 [`slice::rchunks_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks_mut
2233 [`slice::rchunks`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rchunks
2234 [cargo/6005]: https://github.com/rust-lang/cargo/pull/6005/
2235 [cargo/6319]: https://github.com/rust-lang/cargo/pull/6319/
2236 [cargo-rename-reference]: https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#renaming-dependencies-in-cargotoml
2237 [const-reference]: https://doc.rust-lang.org/reference/items/functions.html#const-functions
2239 Version 1.30.1 (2018-11-08)
2240 ===========================
2242 - [Fixed overflow ICE in rustdoc][54199]
2243 - [Cap Cargo progress bar width at 60 in MSYS terminals][cargo/6122]
2245 [54199]: https://github.com/rust-lang/rust/pull/54199
2246 [cargo/6122]: https://github.com/rust-lang/cargo/pull/6122
2248 Version 1.30.0 (2018-10-25)
2249 ==========================
2253 - [Procedural macros are now available.][52081] These kinds of macros allow for
2254 more powerful code generation. There is a [new chapter available][proc-macros]
2255 in the Rust Programming Language book that goes further in depth.
2256 - [You can now use keywords as identifiers using the raw identifiers
2257 syntax (`r#`),][53236] e.g. `let r#for = true;`
2258 - [Using anonymous parameters in traits is now deprecated with a warning and
2259 will be a hard error in the 2018 edition.][53272]
2260 - [You can now use `crate` in paths.][54404] This allows you to refer to the
2261 crate root in the path, e.g. `use crate::foo;` refers to `foo` in `src/lib.rs`.
2262 - [Using a external crate no longer requires being prefixed with `::`.][54404]
2263 Previously, using a external crate in a module without a use statement
2264 required `let json = ::serde_json::from_str(foo);` but can now be written
2265 as `let json = serde_json::from_str(foo);`.
2266 - [You can now apply the `#[used]` attribute to static items to prevent the
2267 compiler from optimising them away, even if they appear to be unused,][51363]
2268 e.g. `#[used] static FOO: u32 = 1;`
2269 - [You can now import and reexport macros from other crates with the `use`
2270 syntax.][50911] Macros exported with `#[macro_export]` are now placed into
2271 the root module of the crate. If your macro relies on calling other local
2272 macros, it is recommended to export with the
2273 `#[macro_export(local_inner_macros)]` attribute so users won't have to import
2275 - [You can now catch visibility keywords (e.g. `pub`, `pub(crate)`) in macros
2276 using the `vis` specifier.][53370]
2277 - [Non-macro attributes now allow all forms of literals, not just
2278 strings.][53044] Previously, you would write `#[attr("true")]`, and you can now
2279 write `#[attr(true)]`.
2280 - [You can now specify a function to handle a panic in the Rust runtime with the
2281 `#[panic_handler]` attribute.][51366]
2285 - [Added the `riscv32imc-unknown-none-elf` target.][53822]
2286 - [Added the `aarch64-unknown-netbsd` target][53165]
2290 - [`ManuallyDrop` now allows the inner type to be unsized.][53033]
2294 - [`Ipv4Addr::BROADCAST`]
2295 - [`Ipv4Addr::LOCALHOST`]
2296 - [`Ipv4Addr::UNSPECIFIED`]
2297 - [`Ipv6Addr::LOCALHOST`]
2298 - [`Ipv6Addr::UNSPECIFIED`]
2299 - [`Iterator::find_map`]
2301 The following methods are replacement methods for `trim_left`, `trim_right`,
2302 `trim_left_matches`, and `trim_right_matches`, which will be deprecated
2304 - [`str::trim_end_matches`]
2306 - [`str::trim_start_matches`]
2307 - [`str::trim_start`]
2311 - [`cargo run` doesn't require specifying a package in workspaces.][cargo/5877]
2312 - [`cargo doc` now supports `--message-format=json`.][cargo/5878] This is
2313 equivalent to calling `rustdoc --error-format=json`.
2314 - [Cargo will now provide a progress bar for builds.][cargo/5995]
2318 - [`rustdoc` allows you to specify what edition to treat your code as with the
2319 `--edition` option.][54057]
2320 - [`rustdoc` now has the `--color` (specify whether to output color) and
2321 `--error-format` (specify error format, e.g. `json`) options.][53003]
2322 - [We now distribute a `rust-gdbgui` script that invokes `gdbgui` with Rust
2323 debug symbols.][53774]
2324 - [Attributes from Rust tools such as `rustfmt` or `clippy` are now
2325 available,][53459] e.g. `#[rustfmt::skip]` will skip formatting the next item.
2327 [50911]: https://github.com/rust-lang/rust/pull/50911/
2328 [51363]: https://github.com/rust-lang/rust/pull/51363/
2329 [51366]: https://github.com/rust-lang/rust/pull/51366/
2330 [52081]: https://github.com/rust-lang/rust/pull/52081/
2331 [53003]: https://github.com/rust-lang/rust/pull/53003/
2332 [53033]: https://github.com/rust-lang/rust/pull/53033/
2333 [53044]: https://github.com/rust-lang/rust/pull/53044/
2334 [53165]: https://github.com/rust-lang/rust/pull/53165/
2335 [53213]: https://github.com/rust-lang/rust/pull/53213/
2336 [53236]: https://github.com/rust-lang/rust/pull/53236/
2337 [53272]: https://github.com/rust-lang/rust/pull/53272/
2338 [53370]: https://github.com/rust-lang/rust/pull/53370/
2339 [53459]: https://github.com/rust-lang/rust/pull/53459/
2340 [53774]: https://github.com/rust-lang/rust/pull/53774/
2341 [53822]: https://github.com/rust-lang/rust/pull/53822/
2342 [54057]: https://github.com/rust-lang/rust/pull/54057/
2343 [54146]: https://github.com/rust-lang/rust/pull/54146/
2344 [54404]: https://github.com/rust-lang/rust/pull/54404/
2345 [cargo/5877]: https://github.com/rust-lang/cargo/pull/5877/
2346 [cargo/5878]: https://github.com/rust-lang/cargo/pull/5878/
2347 [cargo/5995]: https://github.com/rust-lang/cargo/pull/5995/
2348 [proc-macros]: https://doc.rust-lang.org/nightly/book/2018-edition/ch19-06-macros.html
2350 [`Ipv4Addr::BROADCAST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.BROADCAST
2351 [`Ipv4Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.LOCALHOST
2352 [`Ipv4Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#associatedconstant.UNSPECIFIED
2353 [`Ipv6Addr::LOCALHOST`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.LOCALHOST
2354 [`Ipv6Addr::UNSPECIFIED`]: https://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#associatedconstant.UNSPECIFIED
2355 [`Iterator::find_map`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.find_map
2356 [`str::trim_end_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end_matches
2357 [`str::trim_end`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_end
2358 [`str::trim_start_matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start_matches
2359 [`str::trim_start`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.trim_start
2362 Version 1.29.2 (2018-10-11)
2363 ===========================
2365 - [Workaround for an aliasing-related LLVM bug, which caused miscompilation.][54639]
2366 - The `rls-preview` component on the windows-gnu targets has been restored.
2368 [54639]: https://github.com/rust-lang/rust/pull/54639
2371 Version 1.29.1 (2018-09-25)
2372 ===========================
2377 - The standard library's `str::repeat` function contained an out of bounds write
2378 caused by an integer overflow. This has been fixed by deterministically
2379 panicking when an overflow happens.
2381 Thank you to Scott McMurray for responsibly disclosing this vulnerability to
2385 Version 1.29.0 (2018-09-13)
2386 ==========================
2390 - [Bumped minimum LLVM version to 5.0.][51899]
2391 - [Added `powerpc64le-unknown-linux-musl` target.][51619]
2392 - [Added `aarch64-unknown-hermit` and `x86_64-unknown-hermit` targets.][52861]
2396 - [`Once::call_once` no longer requires `Once` to be `'static`.][52239]
2397 - [`BuildHasherDefault` now implements `PartialEq` and `Eq`.][52402]
2398 - [`Box<CStr>`, `Box<OsStr>`, and `Box<Path>` now implement `Clone`.][51912]
2399 - [Implemented `PartialEq<&str>` for `OsString` and `PartialEq<OsString>`
2401 - [`Cell<T>` now allows `T` to be unsized.][50494]
2402 - [`SocketAddr` is now stable on Redox.][52656]
2407 - [`Iterator::flatten`]
2412 - [Cargo can silently fix some bad lockfiles.][cargo/5831] You can use
2413 `--locked` to disable this behavior.
2414 - [`cargo-install` will now allow you to cross compile an install
2415 using `--target`.][cargo/5614]
2416 - [Added the `cargo-fix` subcommand to automatically move project code from
2417 2015 edition to 2018.][cargo/5723]
2418 - [`cargo doc` can now optionally document private types using the
2419 `--document-private-items` flag.][cargo/5543]
2423 - [`rustdoc` now has the `--cap-lints` option which demotes all lints above
2424 the specified level to that level.][52354] For example `--cap-lints warn`
2425 will demote `deny` and `forbid` lints to `warn`.
2426 - [`rustc` and `rustdoc` will now have the exit code of `1` if compilation
2427 fails and `101` if there is a panic.][52197]
2428 - [A preview of clippy has been made available through rustup.][51122]
2429 You can install the preview with `rustup component add clippy-preview`.
2433 - [`str::{slice_unchecked, slice_unchecked_mut}` are now deprecated.][51807]
2434 Use `str::get_unchecked(begin..end)` instead.
2435 - [`std::env::home_dir` is now deprecated for its unintuitive behavior.][51656]
2436 Consider using the `home_dir` function from
2437 https://crates.io/crates/dirs instead.
2438 - [`rustc` will no longer silently ignore invalid data in target spec.][52330]
2439 - [`cfg` attributes and `--cfg` command line flags are now more
2440 strictly validated.][53893]
2442 [53893]: https://github.com/rust-lang/rust/pull/53893/
2443 [52861]: https://github.com/rust-lang/rust/pull/52861/
2444 [52656]: https://github.com/rust-lang/rust/pull/52656/
2445 [52239]: https://github.com/rust-lang/rust/pull/52239/
2446 [52330]: https://github.com/rust-lang/rust/pull/52330/
2447 [52354]: https://github.com/rust-lang/rust/pull/52354/
2448 [52402]: https://github.com/rust-lang/rust/pull/52402/
2449 [52103]: https://github.com/rust-lang/rust/pull/52103/
2450 [52197]: https://github.com/rust-lang/rust/pull/52197/
2451 [51807]: https://github.com/rust-lang/rust/pull/51807/
2452 [51899]: https://github.com/rust-lang/rust/pull/51899/
2453 [51912]: https://github.com/rust-lang/rust/pull/51912/
2454 [51511]: https://github.com/rust-lang/rust/pull/51511/
2455 [51619]: https://github.com/rust-lang/rust/pull/51619/
2456 [51656]: https://github.com/rust-lang/rust/pull/51656/
2457 [51178]: https://github.com/rust-lang/rust/pull/51178/
2458 [51122]: https://github.com/rust-lang/rust/pull/51122
2459 [50494]: https://github.com/rust-lang/rust/pull/50494/
2460 [cargo/5543]: https://github.com/rust-lang/cargo/pull/5543
2461 [cargo/5614]: https://github.com/rust-lang/cargo/pull/5614/
2462 [cargo/5723]: https://github.com/rust-lang/cargo/pull/5723/
2463 [cargo/5831]: https://github.com/rust-lang/cargo/pull/5831/
2464 [`Arc::downcast`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.downcast
2465 [`Iterator::flatten`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.flatten
2466 [`Rc::downcast`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.downcast
2469 Version 1.28.0 (2018-08-02)
2470 ===========================
2474 - [The `#[repr(transparent)]` attribute is now stable.][51562] This attribute
2475 allows a Rust newtype wrapper (`struct NewType<T>(T);`) to be represented as
2476 the inner type across Foreign Function Interface (FFI) boundaries.
2477 - [The keywords `pure`, `sizeof`, `alignof`, and `offsetof` have been unreserved
2478 and can now be used as identifiers.][51196]
2479 - [The `GlobalAlloc` trait and `#[global_allocator]` attribute are now
2480 stable.][51241] This will allow users to specify a global allocator for
2482 - [Unit test functions marked with the `#[test]` attribute can now return
2483 `Result<(), E: Debug>` in addition to `()`.][51298]
2484 - [The `lifetime` specifier for `macro_rules!` is now stable.][50385] This
2485 allows macros to easily target lifetimes.
2489 - [The `s` and `z` optimisation levels are now stable.][50265] These optimisations
2490 prioritise making smaller binary sizes. `z` is the same as `s` with the
2491 exception that it does not vectorise loops, which typically results in an even
2493 - [The short error format is now stable.][49546] Specified with
2494 `--error-format=short` this option will provide a more compressed output of
2495 rust error messages.
2496 - [Added a lint warning when you have duplicated `macro_export`s.][50143]
2497 - [Reduced the number of allocations in the macro parser.][50855] This can
2498 improve compile times of macro heavy crates on average by 5%.
2502 - [Implemented `Default` for `&mut str`.][51306]
2503 - [Implemented `From<bool>` for all integer and unsigned number types.][50554]
2504 - [Implemented `Extend` for `()`.][50234]
2505 - [The `Debug` implementation of `time::Duration` should now be more easily
2506 human readable.][50364] Previously a `Duration` of one second would printed as
2507 `Duration { secs: 1, nanos: 0 }` and will now be printed as `1s`.
2508 - [Implemented `From<&String>` for `Cow<str>`, `From<&Vec<T>>` for `Cow<[T]>`,
2509 `From<Cow<CStr>>` for `CString`, `From<CString>, From<CStr>, From<&CString>`
2510 for `Cow<CStr>`, `From<OsString>, From<OsStr>, From<&OsString>` for
2511 `Cow<OsStr>`, `From<&PathBuf>` for `Cow<Path>`, and `From<Cow<Path>>`
2512 for `PathBuf`.][50170]
2513 - [Implemented `Shl` and `Shr` for `Wrapping<u128>`
2514 and `Wrapping<i128>`.][50465]
2515 - [`DirEntry::metadata` now uses `fstatat` instead of `lstat` when
2516 possible.][51050] This can provide up to a 40% speed increase.
2517 - [Improved error messages when using `format!`.][50610]
2521 - [`Iterator::step_by`]
2522 - [`Path::ancestors`]
2523 - [`SystemTime::UNIX_EPOCH`]
2524 - [`alloc::GlobalAlloc`]
2526 - [`alloc::LayoutErr`]
2529 - [`alloc::alloc_zeroed`]
2530 - [`alloc::dealloc`]
2531 - [`alloc::realloc`]
2532 - [`alloc::handle_alloc_error`]
2533 - [`btree_map::Entry::or_default`]
2534 - [`fmt::Alignment`]
2535 - [`hash_map::Entry::or_default`]
2536 - [`iter::repeat_with`]
2537 - [`num::NonZeroUsize`]
2538 - [`num::NonZeroU128`]
2539 - [`num::NonZeroU16`]
2540 - [`num::NonZeroU32`]
2541 - [`num::NonZeroU64`]
2542 - [`num::NonZeroU8`]
2543 - [`ops::RangeBounds`]
2544 - [`slice::SliceIndex`]
2545 - [`slice::from_mut`]
2546 - [`slice::from_ref`]
2547 - [`{Any + Send + Sync}::downcast_mut`]
2548 - [`{Any + Send + Sync}::downcast_ref`]
2549 - [`{Any + Send + Sync}::is`]
2553 - [Cargo will now no longer allow you to publish crates with build scripts that
2554 modify the `src` directory.][cargo/5584] The `src` directory in a crate should be
2555 considered to be immutable.
2559 - [The `suggestion_applicability` field in `rustc`'s json output is now
2560 stable.][50486] This will allow dev tools to check whether a code suggestion
2561 would apply to them.
2565 - [Rust will consider trait objects with duplicated constraints to be the same
2566 type as without the duplicated constraint.][51276] For example the below code will
2567 now fail to compile.
2572 fn test(&self) { println!("one"); } //~ ERROR duplicate definitions with name `test`
2575 impl Trait + Send + Send {
2576 fn test(&self) { println!("two"); }
2580 [49546]: https://github.com/rust-lang/rust/pull/49546/
2581 [50143]: https://github.com/rust-lang/rust/pull/50143/
2582 [50170]: https://github.com/rust-lang/rust/pull/50170/
2583 [50234]: https://github.com/rust-lang/rust/pull/50234/
2584 [50265]: https://github.com/rust-lang/rust/pull/50265/
2585 [50364]: https://github.com/rust-lang/rust/pull/50364/
2586 [50385]: https://github.com/rust-lang/rust/pull/50385/
2587 [50465]: https://github.com/rust-lang/rust/pull/50465/
2588 [50486]: https://github.com/rust-lang/rust/pull/50486/
2589 [50554]: https://github.com/rust-lang/rust/pull/50554/
2590 [50610]: https://github.com/rust-lang/rust/pull/50610/
2591 [50855]: https://github.com/rust-lang/rust/pull/50855/
2592 [51050]: https://github.com/rust-lang/rust/pull/51050/
2593 [51196]: https://github.com/rust-lang/rust/pull/51196/
2594 [51200]: https://github.com/rust-lang/rust/pull/51200/
2595 [51241]: https://github.com/rust-lang/rust/pull/51241/
2596 [51276]: https://github.com/rust-lang/rust/pull/51276/
2597 [51298]: https://github.com/rust-lang/rust/pull/51298/
2598 [51306]: https://github.com/rust-lang/rust/pull/51306/
2599 [51562]: https://github.com/rust-lang/rust/pull/51562/
2600 [cargo/5584]: https://github.com/rust-lang/cargo/pull/5584/
2601 [`Iterator::step_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.step_by
2602 [`Path::ancestors`]: https://doc.rust-lang.org/std/path/struct.Path.html#method.ancestors
2603 [`SystemTime::UNIX_EPOCH`]: https://doc.rust-lang.org/std/time/struct.SystemTime.html#associatedconstant.UNIX_EPOCH
2604 [`alloc::GlobalAlloc`]: https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html
2605 [`alloc::Layout`]: https://doc.rust-lang.org/std/alloc/struct.Layout.html
2606 [`alloc::LayoutErr`]: https://doc.rust-lang.org/std/alloc/struct.LayoutErr.html
2607 [`alloc::System`]: https://doc.rust-lang.org/std/alloc/struct.System.html
2608 [`alloc::alloc`]: https://doc.rust-lang.org/std/alloc/fn.alloc.html
2609 [`alloc::alloc_zeroed`]: https://doc.rust-lang.org/std/alloc/fn.alloc_zeroed.html
2610 [`alloc::dealloc`]: https://doc.rust-lang.org/std/alloc/fn.dealloc.html
2611 [`alloc::realloc`]: https://doc.rust-lang.org/std/alloc/fn.realloc.html
2612 [`alloc::handle_alloc_error`]: https://doc.rust-lang.org/std/alloc/fn.handle_alloc_error.html
2613 [`btree_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.or_default
2614 [`fmt::Alignment`]: https://doc.rust-lang.org/std/fmt/enum.Alignment.html
2615 [`hash_map::Entry::or_default`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.or_default
2616 [`iter::repeat_with`]: https://doc.rust-lang.org/std/iter/fn.repeat_with.html
2617 [`num::NonZeroUsize`]: https://doc.rust-lang.org/std/num/struct.NonZeroUsize.html
2618 [`num::NonZeroU128`]: https://doc.rust-lang.org/std/num/struct.NonZeroU128.html
2619 [`num::NonZeroU16`]: https://doc.rust-lang.org/std/num/struct.NonZeroU16.html
2620 [`num::NonZeroU32`]: https://doc.rust-lang.org/std/num/struct.NonZeroU32.html
2621 [`num::NonZeroU64`]: https://doc.rust-lang.org/std/num/struct.NonZeroU64.html
2622 [`num::NonZeroU8`]: https://doc.rust-lang.org/std/num/struct.NonZeroU8.html
2623 [`ops::RangeBounds`]: https://doc.rust-lang.org/std/ops/trait.RangeBounds.html
2624 [`slice::SliceIndex`]: https://doc.rust-lang.org/std/slice/trait.SliceIndex.html
2625 [`slice::from_mut`]: https://doc.rust-lang.org/std/slice/fn.from_mut.html
2626 [`slice::from_ref`]: https://doc.rust-lang.org/std/slice/fn.from_ref.html
2627 [`{Any + Send + Sync}::downcast_mut`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_mut-2
2628 [`{Any + Send + Sync}::downcast_ref`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.downcast_ref-2
2629 [`{Any + Send + Sync}::is`]: https://doc.rust-lang.org/std/any/trait.Any.html#method.is-2
2631 Version 1.27.2 (2018-07-20)
2632 ===========================
2637 - The borrow checker was fixed to avoid potential unsoundness when using
2638 match ergonomics: [#52213][52213].
2640 [52213]: https://github.com/rust-lang/rust/issues/52213
2642 Version 1.27.1 (2018-07-10)
2643 ===========================
2648 - rustdoc would execute plugins in the /tmp/rustdoc/plugins directory
2649 when running, which enabled executing code as some other user on a
2650 given machine. This release fixes that vulnerability; you can read
2651 more about this on the [blog][rustdoc-sec]. The associated CVE is [CVE-2018-1000622].
2653 Thank you to Red Hat for responsibly disclosing this vulnerability to us.
2658 - The borrow checker was fixed to avoid an additional potential unsoundness when using
2659 match ergonomics: [#51415][51415], [#49534][49534].
2661 [51415]: https://github.com/rust-lang/rust/issues/51415
2662 [49534]: https://github.com/rust-lang/rust/issues/49534
2663 [rustdoc-sec]: https://blog.rust-lang.org/2018/07/06/security-advisory-for-rustdoc.html
2664 [CVE-2018-1000622]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=%20CVE-2018-1000622
2666 Version 1.27.0 (2018-06-21)
2667 ==========================
2671 - [Removed 'proc' from the reserved keywords list.][49699] This allows `proc` to
2672 be used as an identifier.
2673 - [The dyn syntax is now available.][49968] This syntax is equivalent to the
2674 bare `Trait` syntax, and should make it clearer when being used in tandem with
2675 `impl Trait` because it is equivalent to the following syntax:
2676 `&Trait == &dyn Trait`, `&mut Trait == &mut dyn Trait`, and
2677 `Box<Trait> == Box<dyn Trait>`.
2678 - [Attributes on generic parameters such as types and lifetimes are
2679 now stable.][48851] e.g.
2680 `fn foo<#[lifetime_attr] 'a, #[type_attr] T: 'a>() {}`
2681 - [The `#[must_use]` attribute can now also be used on functions as well as
2682 types.][48925] It provides a lint that by default warns users when the
2683 value returned by a function has not been used.
2687 - [Added the `armv5te-unknown-linux-musleabi` target.][50423]
2691 - [SIMD (Single Instruction Multiple Data) on x86/x86_64 is now stable.][49664]
2692 This includes [`arch::x86`] & [`arch::x86_64`] modules which contain
2693 SIMD intrinsics, a new macro called `is_x86_feature_detected!`, the
2694 `#[target_feature(enable="")]` attribute, and adding `target_feature = ""` to
2695 the `cfg` attribute.
2696 - [A lot of methods for `[u8]`, `f32`, and `f64` previously only available in
2697 std are now available in core.][49896]
2698 - [The generic `Rhs` type parameter on `ops::{Shl, ShlAssign, Shr}` now defaults
2700 - [`std::str::replace` now has the `#[must_use]` attribute][50177] to clarify
2701 that the operation isn't done in place.
2702 - [`Clone::clone`, `Iterator::collect`, and `ToOwned::to_owned` now have
2703 the `#[must_use]` attribute][49533] to warn about unused potentially
2704 expensive allocations.
2708 - [`DoubleEndedIterator::rfind`]
2709 - [`DoubleEndedIterator::rfold`]
2710 - [`DoubleEndedIterator::try_rfold`]
2711 - [`Duration::from_micros`]
2712 - [`Duration::from_nanos`]
2713 - [`Duration::subsec_micros`]
2714 - [`Duration::subsec_millis`]
2715 - [`HashMap::remove_entry`]
2716 - [`Iterator::try_fold`]
2717 - [`Iterator::try_for_each`]
2719 - [`Option::filter`]
2720 - [`String::replace_range`]
2721 - [`Take::set_limit`]
2722 - [`hint::unreachable_unchecked`]
2723 - [`os::unix::process::parent_id`]
2724 - [`ptr::swap_nonoverlapping`]
2725 - [`slice::rsplit_mut`]
2727 - [`slice::swap_with_slice`]
2731 - [`cargo-metadata` now includes `authors`, `categories`, `keywords`,
2732 `readme`, and `repository` fields.][cargo/5386]
2733 - [`cargo-metadata` now includes a package's `metadata` table.][cargo/5360]
2734 - [Added the `--target-dir` optional argument.][cargo/5393] This allows you to specify
2735 a different directory than `target` for placing compilation artifacts.
2736 - [Cargo will be adding automatic target inference for binaries, benchmarks,
2737 examples, and tests in the Rust 2018 edition.][cargo/5335] If your project specifies
2738 specific targets, e.g. using `[[bin]]`, and have other binaries in locations
2739 where cargo would infer a binary, Cargo will produce a warning. You can
2740 disable this feature ahead of time by setting any of the following to false:
2741 `autobins`, `autobenches`, `autoexamples`, `autotests`.
2742 - [Cargo will now cache compiler information.][cargo/5359] This can be disabled by
2743 setting `CARGO_CACHE_RUSTC_INFO=0` in your environment.
2747 - [Added “The Rustc book” into the official documentation.][49707]
2748 [“The Rustc book”] documents and teaches how to use the rustc compiler.
2749 - [All books available on `doc.rust-lang.org` are now searchable.][49623]
2753 - [Calling a `CharExt` or `StrExt` method directly on core will no longer
2754 work.][49896] e.g. `::core::prelude::v1::StrExt::is_empty("")` will not
2755 compile, `"".is_empty()` will still compile.
2756 - [`Debug` output on `atomic::{AtomicBool, AtomicIsize, AtomicPtr, AtomicUsize}`
2757 will only print the inner type.][48553] E.g.
2758 `print!("{:?}", AtomicBool::new(true))` will print `true`,
2759 not `AtomicBool(true)`.
2760 - [The maximum number for `repr(align(N))` is now 2²⁹.][50378] Previously you
2761 could enter higher numbers but they were not supported by LLVM. Up to 512MB
2762 alignment should cover all use cases.
2763 - The `.description()` method on the `std::error::Error` trait
2764 [has been soft-deprecated][50163]. It is no longer required to implement it.
2766 [48553]: https://github.com/rust-lang/rust/pull/48553/
2767 [48851]: https://github.com/rust-lang/rust/pull/48851/
2768 [48925]: https://github.com/rust-lang/rust/pull/48925/
2769 [49533]: https://github.com/rust-lang/rust/pull/49533/
2770 [49623]: https://github.com/rust-lang/rust/pull/49623/
2771 [49630]: https://github.com/rust-lang/rust/pull/49630/
2772 [49664]: https://github.com/rust-lang/rust/pull/49664/
2773 [49699]: https://github.com/rust-lang/rust/pull/49699/
2774 [49707]: https://github.com/rust-lang/rust/pull/49707/
2775 [49719]: https://github.com/rust-lang/rust/pull/49719/
2776 [49896]: https://github.com/rust-lang/rust/pull/49896/
2777 [49968]: https://github.com/rust-lang/rust/pull/49968/
2778 [50163]: https://github.com/rust-lang/rust/pull/50163
2779 [50177]: https://github.com/rust-lang/rust/pull/50177/
2780 [50378]: https://github.com/rust-lang/rust/pull/50378/
2781 [50398]: https://github.com/rust-lang/rust/pull/50398/
2782 [50423]: https://github.com/rust-lang/rust/pull/50423/
2783 [cargo/5203]: https://github.com/rust-lang/cargo/pull/5203/
2784 [cargo/5335]: https://github.com/rust-lang/cargo/pull/5335/
2785 [cargo/5359]: https://github.com/rust-lang/cargo/pull/5359/
2786 [cargo/5360]: https://github.com/rust-lang/cargo/pull/5360/
2787 [cargo/5386]: https://github.com/rust-lang/cargo/pull/5386/
2788 [cargo/5393]: https://github.com/rust-lang/cargo/pull/5393/
2789 [`DoubleEndedIterator::rfind`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfind
2790 [`DoubleEndedIterator::rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.rfold
2791 [`DoubleEndedIterator::try_rfold`]: https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html#method.try_rfold
2792 [`Duration::from_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_micros
2793 [`Duration::from_nanos`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.from_nanos
2794 [`Duration::subsec_micros`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_micros
2795 [`Duration::subsec_millis`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.subsec_millis
2796 [`HashMap::remove_entry`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.remove_entry
2797 [`Iterator::try_fold`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_fold
2798 [`Iterator::try_for_each`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.try_for_each
2799 [`NonNull::cast`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.cast
2800 [`Option::filter`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.filter
2801 [`String::replace_range`]: https://doc.rust-lang.org/std/string/struct.String.html#method.replace_range
2802 [`Take::set_limit`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.set_limit
2803 [`hint::unreachable_unchecked`]: https://doc.rust-lang.org/std/hint/fn.unreachable_unchecked.html
2804 [`os::unix::process::parent_id`]: https://doc.rust-lang.org/std/os/unix/process/fn.parent_id.html
2805 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
2806 [`ptr::swap_nonoverlapping`]: https://doc.rust-lang.org/std/ptr/fn.swap_nonoverlapping.html
2807 [`slice::rsplit_mut`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit_mut
2808 [`slice::rsplit`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rsplit
2809 [`slice::swap_with_slice`]: https://doc.rust-lang.org/std/primitive.slice.html#method.swap_with_slice
2810 [`arch::x86_64`]: https://doc.rust-lang.org/std/arch/x86_64/index.html
2811 [`arch::x86`]: https://doc.rust-lang.org/std/arch/x86/index.html
2812 [“The Rustc book”]: https://doc.rust-lang.org/rustc
2815 Version 1.26.2 (2018-06-05)
2816 ==========================
2821 - [The borrow checker was fixed to avoid unsoundness when using match ergonomics.][51117]
2823 [51117]: https://github.com/rust-lang/rust/issues/51117
2826 Version 1.26.1 (2018-05-29)
2827 ==========================
2832 - [RLS now works on Windows.][50646]
2833 - [Rustfmt stopped badly formatting text in some cases.][rustfmt/2695]
2839 - [`fn main() -> impl Trait` no longer works for non-Termination
2841 This reverts an accidental stabilization.
2842 - [`NaN > NaN` no longer returns true in const-fn contexts.][50812]
2843 - [Prohibit using turbofish for `impl Trait` in method arguments.][50950]
2845 [50646]: https://github.com/rust-lang/rust/issues/50646
2846 [50656]: https://github.com/rust-lang/rust/pull/50656
2847 [50812]: https://github.com/rust-lang/rust/pull/50812
2848 [50950]: https://github.com/rust-lang/rust/issues/50950
2849 [rustfmt/2695]: https://github.com/rust-lang-nursery/rustfmt/issues/2695
2851 Version 1.26.0 (2018-05-10)
2852 ==========================
2856 - [Closures now implement `Copy` and/or `Clone` if all captured variables
2857 implement either or both traits.][49299]
2858 - [The inclusive range syntax e.g. `for x in 0..=10` is now stable.][47813]
2859 - [The `'_` lifetime is now stable. The underscore lifetime can be used anywhere a
2860 lifetime can be elided.][49458]
2861 - [`impl Trait` is now stable allowing you to have abstract types in returns
2862 or in function parameters.][49255] E.g. `fn foo() -> impl Iterator<Item=u8>` or
2863 `fn open(path: impl AsRef<Path>)`.
2864 - [Pattern matching will now automatically apply dereferences.][49394]
2865 - [128-bit integers in the form of `u128` and `i128` are now stable.][49101]
2866 - [`main` can now return `Result<(), E: Debug>`][49162] in addition to `()`.
2867 - [A lot of operations are now available in a const context.][46882] E.g. You
2868 can now index into constant arrays, reference and dereference into constants,
2869 and use tuple struct constructors.
2870 - [Fixed entry slice patterns are now stable.][48516] E.g.
2872 let points = [1, 2, 3, 4];
2874 [1, 2, 3, 4] => println!("All points were sequential."),
2875 _ => println!("Not all points were sequential."),
2882 - [LLD is now used as the default linker for `wasm32-unknown-unknown`.][48125]
2883 - [Fixed exponential projection complexity on nested types.][48296]
2884 This can provide up to a ~12% reduction in compile times for certain crates.
2885 - [Added the `--remap-path-prefix` option to rustc.][48359] Allowing you
2886 to remap path prefixes outputted by the compiler.
2887 - [Added `powerpc-unknown-netbsd` target.][48281]
2891 - [Implemented `From<u16> for usize` & `From<{u8, i16}> for isize`.][49305]
2892 - [Added hexadecimal formatting for integers with fmt::Debug][48978]
2893 e.g. `assert!(format!("{:02x?}", b"Foo\0") == "[46, 6f, 6f, 00]")`
2894 - [Implemented `Default, Hash` for `cmp::Reverse`.][48628]
2895 - [Optimized `str::repeat` being 8x faster in large cases.][48657]
2896 - [`ascii::escape_default` is now available in libcore.][48735]
2897 - [Trailing commas are now supported in std and core macros.][48056]
2898 - [Implemented `Copy, Clone` for `cmp::Reverse`][47379]
2899 - [Implemented `Clone` for `char::{ToLowercase, ToUppercase}`.][48629]
2904 - [`*const T::copy_to_nonoverlapping`]
2905 - [`*const T::copy_to`]
2906 - [`*const T::read_unaligned`]
2907 - [`*const T::read_volatile`]
2908 - [`*const T::read`]
2910 - [`*const T::wrapping_add`]
2911 - [`*const T::wrapping_sub`]
2913 - [`*mut T::copy_to_nonoverlapping`]
2914 - [`*mut T::copy_to`]
2915 - [`*mut T::read_unaligned`]
2916 - [`*mut T::read_volatile`]
2918 - [`*mut T::replace`]
2921 - [`*mut T::wrapping_add`]
2922 - [`*mut T::wrapping_sub`]
2923 - [`*mut T::write_bytes`]
2924 - [`*mut T::write_unaligned`]
2925 - [`*mut T::write_volatile`]
2928 - [`FromUtf8Error::as_bytes`]
2929 - [`LocalKey::try_with`]
2930 - [`Option::cloned`]
2931 - [`btree_map::Entry::and_modify`]
2932 - [`fs::read_to_string`]
2935 - [`hash_map::Entry::and_modify`]
2936 - [`iter::FusedIterator`]
2937 - [`ops::RangeInclusive`]
2938 - [`ops::RangeToInclusive`]
2940 - [`slice::rotate_left`]
2941 - [`slice::rotate_right`]
2942 - [`String::retain`]
2947 - [Cargo will now output path to custom commands when `-v` is
2948 passed with `--list`][cargo/5041]
2949 - [The Cargo binary version is now the same as the Rust version][cargo/5083]
2953 - [The second edition of "The Rust Programming Language" book is now recommended
2954 over the first.][48404]
2959 - [aliasing a `Fn` trait as `dyn` no longer works.][48481] E.g. the following
2960 syntax is now invalid.
2962 use std::ops::Fn as dyn;
2963 fn g(_: Box<dyn(std::fmt::Debug)>) {}
2965 - [The result of dereferences are no longer promoted to `'static`.][47408]
2969 const PAIR: &(i32, i32) = &(0, 1);
2970 let _reversed_pair: &'static _ = &(PAIR.1, PAIR.0); // Doesn't work
2973 - [Deprecate `AsciiExt` trait in favor of inherent methods.][49109]
2974 - [`".e0"` will now no longer parse as `0.0` and will instead cause
2976 - [Removed hoedown from rustdoc.][48274]
2977 - [Bounds on higher-kinded lifetimes a hard error.][48326]
2979 [46882]: https://github.com/rust-lang/rust/pull/46882
2980 [47379]: https://github.com/rust-lang/rust/pull/47379
2981 [47408]: https://github.com/rust-lang/rust/pull/47408
2982 [47813]: https://github.com/rust-lang/rust/pull/47813
2983 [48056]: https://github.com/rust-lang/rust/pull/48056
2984 [48125]: https://github.com/rust-lang/rust/pull/48125
2985 [48166]: https://github.com/rust-lang/rust/pull/48166
2986 [48235]: https://github.com/rust-lang/rust/pull/48235
2987 [48274]: https://github.com/rust-lang/rust/pull/48274
2988 [48281]: https://github.com/rust-lang/rust/pull/48281
2989 [48296]: https://github.com/rust-lang/rust/pull/48296
2990 [48326]: https://github.com/rust-lang/rust/pull/48326
2991 [48359]: https://github.com/rust-lang/rust/pull/48359
2992 [48404]: https://github.com/rust-lang/rust/pull/48404
2993 [48481]: https://github.com/rust-lang/rust/pull/48481
2994 [48516]: https://github.com/rust-lang/rust/pull/48516
2995 [48628]: https://github.com/rust-lang/rust/pull/48628
2996 [48629]: https://github.com/rust-lang/rust/pull/48629
2997 [48657]: https://github.com/rust-lang/rust/pull/48657
2998 [48735]: https://github.com/rust-lang/rust/pull/48735
2999 [48978]: https://github.com/rust-lang/rust/pull/48978
3000 [49101]: https://github.com/rust-lang/rust/pull/49101
3001 [49109]: https://github.com/rust-lang/rust/pull/49109
3002 [49121]: https://github.com/rust-lang/rust/pull/49121
3003 [49162]: https://github.com/rust-lang/rust/pull/49162
3004 [49184]: https://github.com/rust-lang/rust/pull/49184
3005 [49234]: https://github.com/rust-lang/rust/pull/49234
3006 [49255]: https://github.com/rust-lang/rust/pull/49255
3007 [49299]: https://github.com/rust-lang/rust/pull/49299
3008 [49305]: https://github.com/rust-lang/rust/pull/49305
3009 [49394]: https://github.com/rust-lang/rust/pull/49394
3010 [49458]: https://github.com/rust-lang/rust/pull/49458
3011 [`*const T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add
3012 [`*const T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping
3013 [`*const T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to
3014 [`*const T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned
3015 [`*const T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile
3016 [`*const T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read
3017 [`*const T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub
3018 [`*const T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add
3019 [`*const T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub
3020 [`*mut T::add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.add-1
3021 [`*mut T::copy_to_nonoverlapping`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to_nonoverlapping-1
3022 [`*mut T::copy_to`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.copy_to-1
3023 [`*mut T::read_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_unaligned-1
3024 [`*mut T::read_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read_volatile-1
3025 [`*mut T::read`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.read-1
3026 [`*mut T::replace`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.replace
3027 [`*mut T::sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.sub-1
3028 [`*mut T::swap`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.swap
3029 [`*mut T::wrapping_add`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_add-1
3030 [`*mut T::wrapping_sub`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_sub-1
3031 [`*mut T::write_bytes`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_bytes
3032 [`*mut T::write_unaligned`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_unaligned
3033 [`*mut T::write_volatile`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write_volatile
3034 [`*mut T::write`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.write
3035 [`Box::leak`]: https://doc.rust-lang.org/std/boxed/struct.Box.html#method.leak
3036 [`FromUtf8Error::as_bytes`]: https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html#method.as_bytes
3037 [`LocalKey::try_with`]: https://doc.rust-lang.org/std/thread/struct.LocalKey.html#method.try_with
3038 [`Option::cloned`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.cloned
3039 [`btree_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/btree_map/enum.Entry.html#method.and_modify
3040 [`fs::read_to_string`]: https://doc.rust-lang.org/std/fs/fn.read_to_string.html
3041 [`fs::read`]: https://doc.rust-lang.org/std/fs/fn.read.html
3042 [`fs::write`]: https://doc.rust-lang.org/std/fs/fn.write.html
3043 [`hash_map::Entry::and_modify`]: https://doc.rust-lang.org/std/collections/hash_map/enum.Entry.html#method.and_modify
3044 [`iter::FusedIterator`]: https://doc.rust-lang.org/std/iter/trait.FusedIterator.html
3045 [`ops::RangeInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeInclusive.html
3046 [`ops::RangeToInclusive`]: https://doc.rust-lang.org/std/ops/struct.RangeToInclusive.html
3047 [`process::id`]: https://doc.rust-lang.org/std/process/fn.id.html
3048 [`slice::rotate_left`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_left
3049 [`slice::rotate_right`]: https://doc.rust-lang.org/std/primitive.slice.html#method.rotate_right
3050 [`String::retain`]: https://doc.rust-lang.org/std/string/struct.String.html#method.retain
3051 [cargo/5041]: https://github.com/rust-lang/cargo/pull/5041
3052 [cargo/5083]: https://github.com/rust-lang/cargo/pull/5083
3055 Version 1.25.0 (2018-03-29)
3056 ==========================
3060 - [The `#[repr(align(x))]` attribute is now stable.][47006] [RFC 1358]
3061 - [You can now use nested groups of imports.][47948]
3062 e.g. `use std::{fs::File, io::Read, path::{Path, PathBuf}};`
3063 - [You can now have `|` at the start of a match arm.][47947] e.g.
3065 enum Foo { A, B, C }
3071 | Foo::B => println!("AB"),
3072 | Foo::C => println!("C"),
3079 - [Upgraded to LLVM 6.][47828]
3080 - [Added `-C lto=val` option.][47521]
3081 - [Added `i586-unknown-linux-musl` target][47282]
3085 - [Impl Send for `process::Command` on Unix.][47760]
3086 - [Impl PartialEq and Eq for `ParseCharError`.][47790]
3087 - [`UnsafeCell::into_inner` is now safe.][47204]
3088 - [Implement libstd for CloudABI.][47268]
3089 - [`Float::{from_bits, to_bits}` is now available in libcore.][46931]
3090 - [Implement `AsRef<Path>` for Component][46985]
3091 - [Implemented `Write` for `Cursor<&mut Vec<u8>>`][46830]
3092 - [Moved `Duration` to libcore.][46666]
3096 - [`Location::column`]
3099 The following functions can now be used in a constant expression.
3100 eg. `static MINUTE: Duration = Duration::from_secs(60);`
3101 - [`Duration::new`][47300]
3102 - [`Duration::from_secs`][47300]
3103 - [`Duration::from_millis`][47300]
3107 - [`cargo new` no longer removes `rust` or `rs` prefixs/suffixs.][cargo/5013]
3108 - [`cargo new` now defaults to creating a binary crate, instead of a
3109 library crate.][cargo/5029]
3113 - [Rust by example is now shipped with new releases][46196]
3117 - [Deprecated `net::lookup_host`.][47510]
3118 - [`rustdoc` has switched to pulldown as the default markdown renderer.][47398]
3119 - The borrow checker was sometimes incorrectly permitting overlapping borrows
3120 around indexing operations (see [#47349][47349]). This has been fixed (which also
3121 enabled some correct code that used to cause errors (e.g. [#33903][33903] and [#46095][46095]).
3122 - [Removed deprecated unstable attribute `#[simd]`.][47251]
3124 [33903]: https://github.com/rust-lang/rust/pull/33903
3125 [47947]: https://github.com/rust-lang/rust/pull/47947
3126 [47948]: https://github.com/rust-lang/rust/pull/47948
3127 [47760]: https://github.com/rust-lang/rust/pull/47760
3128 [47790]: https://github.com/rust-lang/rust/pull/47790
3129 [47828]: https://github.com/rust-lang/rust/pull/47828
3130 [47398]: https://github.com/rust-lang/rust/pull/47398
3131 [47510]: https://github.com/rust-lang/rust/pull/47510
3132 [47521]: https://github.com/rust-lang/rust/pull/47521
3133 [47204]: https://github.com/rust-lang/rust/pull/47204
3134 [47251]: https://github.com/rust-lang/rust/pull/47251
3135 [47268]: https://github.com/rust-lang/rust/pull/47268
3136 [47282]: https://github.com/rust-lang/rust/pull/47282
3137 [47300]: https://github.com/rust-lang/rust/pull/47300
3138 [47349]: https://github.com/rust-lang/rust/pull/47349
3139 [46931]: https://github.com/rust-lang/rust/pull/46931
3140 [46985]: https://github.com/rust-lang/rust/pull/46985
3141 [47006]: https://github.com/rust-lang/rust/pull/47006
3142 [46830]: https://github.com/rust-lang/rust/pull/46830
3143 [46095]: https://github.com/rust-lang/rust/pull/46095
3144 [46666]: https://github.com/rust-lang/rust/pull/46666
3145 [46196]: https://github.com/rust-lang/rust/pull/46196
3146 [cargo/5013]: https://github.com/rust-lang/cargo/pull/5013
3147 [cargo/5029]: https://github.com/rust-lang/cargo/pull/5029
3148 [RFC 1358]: https://github.com/rust-lang/rfcs/pull/1358
3149 [`Location::column`]: https://doc.rust-lang.org/std/panic/struct.Location.html#method.column
3150 [`ptr::NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
3153 Version 1.24.1 (2018-03-01)
3154 ==========================
3156 - [Do not abort when unwinding through FFI][48251]
3157 - [Emit UTF-16 files for linker arguments on Windows][48318]
3158 - [Make the error index generator work again][48308]
3159 - [Cargo will warn on Windows 7 if an update is needed][cargo/5069].
3161 [48251]: https://github.com/rust-lang/rust/issues/48251
3162 [48308]: https://github.com/rust-lang/rust/issues/48308
3163 [48318]: https://github.com/rust-lang/rust/issues/48318
3164 [cargo/5069]: https://github.com/rust-lang/cargo/pull/5069
3167 Version 1.24.0 (2018-02-15)
3168 ==========================
3172 - [External `sysv64` ffi is now available.][46528]
3173 eg. `extern "sysv64" fn foo () {}`
3177 - [rustc now uses 16 codegen units by default for release builds.][46910]
3178 For the fastest builds, utilize `codegen-units=1`.
3179 - [Added `armv4t-unknown-linux-gnueabi` target.][47018]
3180 - [Add `aarch64-unknown-openbsd` support][46760]
3184 - [`str::find::<char>` now uses memchr.][46735] This should lead to a 10x
3185 improvement in performance in the majority of cases.
3186 - [`OsStr`'s `Debug` implementation is now lossless and consistent
3187 with Windows.][46798]
3188 - [`time::{SystemTime, Instant}` now implement `Hash`.][46828]
3189 - [impl `From<bool>` for `AtomicBool`][46293]
3190 - [impl `From<{CString, &CStr}>` for `{Arc<CStr>, Rc<CStr>}`][45990]
3191 - [impl `From<{OsString, &OsStr}>` for `{Arc<OsStr>, Rc<OsStr>}`][45990]
3192 - [impl `From<{PathBuf, &Path}>` for `{Arc<Path>, Rc<Path>}`][45990]
3193 - [float::from_bits now just uses transmute.][46012] This provides
3194 some optimisations from LLVM.
3195 - [Copied `AsciiExt` methods onto `char`][46077]
3196 - [Remove `T: Sized` requirement on `ptr::is_null()`][46094]
3197 - [impl `From<RecvError>` for `{TryRecvError, RecvTimeoutError}`][45506]
3198 - [Optimised `f32::{min, max}` to generate more efficient x86 assembly][47080]
3199 - [`[u8]::contains` now uses memchr which provides a 3x speed improvement][46713]
3203 - [`RefCell::replace`]
3205 - [`atomic::spin_loop_hint`]
3207 The following functions can now be used in a constant expression.
3208 eg. `let buffer: [u8; size_of::<usize>()];`, `static COUNTER: AtomicUsize = AtomicUsize::new(1);`
3210 - [`AtomicBool::new`][46287]
3211 - [`AtomicUsize::new`][46287]
3212 - [`AtomicIsize::new`][46287]
3213 - [`AtomicPtr::new`][46287]
3214 - [`Cell::new`][46287]
3215 - [`{integer}::min_value`][46287]
3216 - [`{integer}::max_value`][46287]
3217 - [`mem::size_of`][46287]
3218 - [`mem::align_of`][46287]
3219 - [`ptr::null`][46287]
3220 - [`ptr::null_mut`][46287]
3221 - [`RefCell::new`][46287]
3222 - [`UnsafeCell::new`][46287]
3226 - [Added a `workspace.default-members` config that
3227 overrides implied `--all` in virtual workspaces.][cargo/4743]
3228 - [Enable incremental by default on development builds.][cargo/4817] Also added
3229 configuration keys to `Cargo.toml` and `.cargo/config` to disable on a
3230 per-project or global basis respectively.
3237 - [Floating point types `Debug` impl now always prints a decimal point.][46831]
3238 - [`Ipv6Addr` now rejects superfluous `::`'s in IPv6 addresses][46671] This is
3239 in accordance with IETF RFC 4291 §2.2.
3240 - [Unwinding will no longer go past FFI boundaries, and will instead abort.][46833]
3241 - [`Formatter::flags` method is now deprecated.][46284] The `sign_plus`,
3242 `sign_minus`, `alternate`, and `sign_aware_zero_pad` should be used instead.
3243 - [Leading zeros in tuple struct members is now an error][47084]
3244 - [`column!()` macro is one-based instead of zero-based][46977]
3245 - [`fmt::Arguments` can no longer be shared across threads][45198]
3246 - [Access to `#[repr(packed)]` struct fields is now unsafe][44884]
3247 - [Cargo sets a different working directory for the compiler][cargo/4788]
3249 [44884]: https://github.com/rust-lang/rust/pull/44884
3250 [45198]: https://github.com/rust-lang/rust/pull/45198
3251 [45506]: https://github.com/rust-lang/rust/pull/45506
3252 [45904]: https://github.com/rust-lang/rust/pull/45904
3253 [45990]: https://github.com/rust-lang/rust/pull/45990
3254 [46012]: https://github.com/rust-lang/rust/pull/46012
3255 [46077]: https://github.com/rust-lang/rust/pull/46077
3256 [46094]: https://github.com/rust-lang/rust/pull/46094
3257 [46284]: https://github.com/rust-lang/rust/pull/46284
3258 [46287]: https://github.com/rust-lang/rust/pull/46287
3259 [46293]: https://github.com/rust-lang/rust/pull/46293
3260 [46528]: https://github.com/rust-lang/rust/pull/46528
3261 [46671]: https://github.com/rust-lang/rust/pull/46671
3262 [46713]: https://github.com/rust-lang/rust/pull/46713
3263 [46735]: https://github.com/rust-lang/rust/pull/46735
3264 [46749]: https://github.com/rust-lang/rust/pull/46749
3265 [46760]: https://github.com/rust-lang/rust/pull/46760
3266 [46798]: https://github.com/rust-lang/rust/pull/46798
3267 [46828]: https://github.com/rust-lang/rust/pull/46828
3268 [46831]: https://github.com/rust-lang/rust/pull/46831
3269 [46833]: https://github.com/rust-lang/rust/pull/46833
3270 [46910]: https://github.com/rust-lang/rust/pull/46910
3271 [46977]: https://github.com/rust-lang/rust/pull/46977
3272 [47018]: https://github.com/rust-lang/rust/pull/47018
3273 [47080]: https://github.com/rust-lang/rust/pull/47080
3274 [47084]: https://github.com/rust-lang/rust/pull/47084
3275 [cargo/4743]: https://github.com/rust-lang/cargo/pull/4743
3276 [cargo/4788]: https://github.com/rust-lang/cargo/pull/4788
3277 [cargo/4817]: https://github.com/rust-lang/cargo/pull/4817
3278 [`RefCell::replace`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.replace
3279 [`RefCell::swap`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.swap
3280 [`atomic::spin_loop_hint`]: https://doc.rust-lang.org/std/sync/atomic/fn.spin_loop_hint.html
3283 Version 1.23.0 (2018-01-04)
3284 ==========================
3288 - [Arbitrary `auto` traits are now permitted in trait objects.][45772]
3289 - [rustc now uses subtyping on the left hand side of binary operations.][45435]
3290 Which should fix some confusing errors in some operations.
3294 - [Enabled `TrapUnreachable` in LLVM which should mitigate the impact of
3295 undefined behavior.][45920]
3296 - [rustc now suggests renaming import if names clash.][45660]
3297 - [Display errors/warnings correctly when there are zero-width or
3298 wide characters.][45711]
3299 - [rustc now avoids unnecessary copies of arguments that are
3300 simple bindings][45380] This should improve memory usage on average by 5-10%.
3301 - [Updated musl used to build musl rustc to 1.1.17][45393]
3305 - [Allow a trailing comma in `assert_eq/ne` macro][45887]
3306 - [Implement Hash for raw pointers to unsized types][45483]
3307 - [impl `From<*mut T>` for `AtomicPtr<T>`][45610]
3308 - [impl `From<usize/isize>` for `AtomicUsize/AtomicIsize`.][45610]
3309 - [Removed the `T: Sync` requirement for `RwLock<T>: Send`][45267]
3310 - [Removed `T: Sized` requirement for `{<*const T>, <*mut T>}::as_ref`
3311 and `<*mut T>::as_mut`][44932]
3312 - [Optimized `Thread::{park, unpark}` implementation][45524]
3313 - [Improved `SliceExt::binary_search` performance.][45333]
3314 - [impl `FromIterator<()>` for `()`][45379]
3315 - [Copied `AsciiExt` trait methods to primitive types.][44042] Use of `AsciiExt`
3323 - [Cargo now supports uninstallation of multiple packages][cargo/4561]
3324 eg. `cargo uninstall foo bar` uninstalls `foo` and `bar`.
3325 - [Added unit test checking to `cargo check`][cargo/4592]
3326 - [Cargo now lets you install a specific version
3327 using `cargo install --version`][cargo/4637]
3331 - [Releases now ship with the Cargo book documentation.][45692]
3332 - [rustdoc now prints rendering warnings on every run.][45324]
3336 - [Changes have been made to type equality to make it more correct,
3337 in rare cases this could break some code.][45853] [Tracking issue for
3338 further information][45852]
3339 - [`char::escape_debug` now uses Unicode 10 over 9.][45571]
3340 - [Upgraded Android SDK to 27, and NDK to r15c.][45580] This drops support for
3341 Android 9, the minimum supported version is Android 14.
3342 - [Bumped the minimum LLVM to 3.9][45326]
3344 [44042]: https://github.com/rust-lang/rust/pull/44042
3345 [44932]: https://github.com/rust-lang/rust/pull/44932
3346 [45267]: https://github.com/rust-lang/rust/pull/45267
3347 [45324]: https://github.com/rust-lang/rust/pull/45324
3348 [45326]: https://github.com/rust-lang/rust/pull/45326
3349 [45333]: https://github.com/rust-lang/rust/pull/45333
3350 [45379]: https://github.com/rust-lang/rust/pull/45379
3351 [45380]: https://github.com/rust-lang/rust/pull/45380
3352 [45393]: https://github.com/rust-lang/rust/pull/45393
3353 [45435]: https://github.com/rust-lang/rust/pull/45435
3354 [45483]: https://github.com/rust-lang/rust/pull/45483
3355 [45524]: https://github.com/rust-lang/rust/pull/45524
3356 [45571]: https://github.com/rust-lang/rust/pull/45571
3357 [45580]: https://github.com/rust-lang/rust/pull/45580
3358 [45610]: https://github.com/rust-lang/rust/pull/45610
3359 [45660]: https://github.com/rust-lang/rust/pull/45660
3360 [45692]: https://github.com/rust-lang/rust/pull/45692
3361 [45711]: https://github.com/rust-lang/rust/pull/45711
3362 [45772]: https://github.com/rust-lang/rust/pull/45772
3363 [45852]: https://github.com/rust-lang/rust/issues/45852
3364 [45853]: https://github.com/rust-lang/rust/pull/45853
3365 [45887]: https://github.com/rust-lang/rust/pull/45887
3366 [45920]: https://github.com/rust-lang/rust/pull/45920
3367 [cargo/4561]: https://github.com/rust-lang/cargo/pull/4561
3368 [cargo/4592]: https://github.com/rust-lang/cargo/pull/4592
3369 [cargo/4637]: https://github.com/rust-lang/cargo/pull/4637
3372 Version 1.22.1 (2017-11-22)
3373 ==========================
3375 - [Update Cargo to fix an issue with macOS 10.13 "High Sierra"][46183]
3377 [46183]: https://github.com/rust-lang/rust/pull/46183
3379 Version 1.22.0 (2017-11-22)
3380 ==========================
3384 - [`non_snake_case` lint now allows extern no-mangle functions][44966]
3385 - [Now accepts underscores in unicode escapes][43716]
3386 - [`T op= &T` now works for numeric types.][44287] eg. `let mut x = 2; x += &8;`
3387 - [types that impl `Drop` are now allowed in `const` and `static` types][44456]
3391 - [rustc now defaults to having 16 codegen units at debug on supported platforms.][45064]
3392 - [rustc will no longer inline in codegen units when compiling for debug][45075]
3393 This should decrease compile times for debug builds.
3394 - [strict memory alignment now enabled on ARMv6][45094]
3395 - [Remove support for the PNaCl target `le32-unknown-nacl`][45041]
3399 - [Allow atomic operations up to 32 bits
3400 on `armv5te_unknown_linux_gnueabi`][44978]
3401 - [`Box<Error>` now impls `From<Cow<str>>`][44466]
3402 - [`std::mem::Discriminant` is now guaranteed to be `Send + Sync`][45095]
3403 - [`fs::copy` now returns the length of the main stream on NTFS.][44895]
3404 - [Properly detect overflow in `Instant += Duration`.][44220]
3405 - [impl `Hasher` for `{&mut Hasher, Box<Hasher>}`][44015]
3406 - [impl `fmt::Debug` for `SplitWhitespace`.][44303]
3407 - [`Option<T>` now impls `Try`][42526] This allows for using `?` with `Option` types.
3414 - [Cargo will now build multi file examples in subdirectories of the `examples`
3415 folder that have a `main.rs` file.][cargo/4496]
3416 - [Changed `[root]` to `[package]` in `Cargo.lock`][cargo/4571] Packages with
3417 the old format will continue to work and can be updated with `cargo update`.
3418 - [Now supports vendoring git repositories][cargo/3992]
3422 - [`libbacktrace` is now available on Apple platforms.][44251]
3423 - [Stabilised the `compile_fail` attribute for code fences in doc-comments.][43949]
3424 This now lets you specify that a given code example will fail to compile.
3428 - [The minimum Android version that rustc can build for has been bumped
3429 to `4.0` from `2.3`][45656]
3430 - [Allowing `T op= &T` for numeric types has broken some type
3431 inference cases][45480]
3434 [42526]: https://github.com/rust-lang/rust/pull/42526
3435 [43017]: https://github.com/rust-lang/rust/pull/43017
3436 [43716]: https://github.com/rust-lang/rust/pull/43716
3437 [43949]: https://github.com/rust-lang/rust/pull/43949
3438 [44015]: https://github.com/rust-lang/rust/pull/44015
3439 [44220]: https://github.com/rust-lang/rust/pull/44220
3440 [44251]: https://github.com/rust-lang/rust/pull/44251
3441 [44287]: https://github.com/rust-lang/rust/pull/44287
3442 [44303]: https://github.com/rust-lang/rust/pull/44303
3443 [44456]: https://github.com/rust-lang/rust/pull/44456
3444 [44466]: https://github.com/rust-lang/rust/pull/44466
3445 [44895]: https://github.com/rust-lang/rust/pull/44895
3446 [44966]: https://github.com/rust-lang/rust/pull/44966
3447 [44978]: https://github.com/rust-lang/rust/pull/44978
3448 [45041]: https://github.com/rust-lang/rust/pull/45041
3449 [45064]: https://github.com/rust-lang/rust/pull/45064
3450 [45075]: https://github.com/rust-lang/rust/pull/45075
3451 [45094]: https://github.com/rust-lang/rust/pull/45094
3452 [45095]: https://github.com/rust-lang/rust/pull/45095
3453 [45480]: https://github.com/rust-lang/rust/issues/45480
3454 [45656]: https://github.com/rust-lang/rust/pull/45656
3455 [cargo/3992]: https://github.com/rust-lang/cargo/pull/3992
3456 [cargo/4496]: https://github.com/rust-lang/cargo/pull/4496
3457 [cargo/4571]: https://github.com/rust-lang/cargo/pull/4571
3464 Version 1.21.0 (2017-10-12)
3465 ==========================
3469 - [You can now use static references for literals.][43838]
3473 let x: &'static u32 = &0;
3476 - [Relaxed path syntax. Optional `::` before `<` is now allowed in all contexts.][43540]
3479 my_macro!(Vec<i32>::new); // Always worked
3480 my_macro!(Vec::<i32>::new); // Now works
3485 - [Upgraded jemalloc to 4.5.0][43911]
3486 - [Enabled unwinding panics on Redox][43917]
3487 - [Now runs LLVM in parallel during translation phase.][43506]
3488 This should reduce peak memory usage.
3492 - [Generate builtin impls for `Clone` for all arrays and tuples that
3493 are `T: Clone`][43690]
3494 - [`Stdin`, `Stdout`, and `Stderr` now implement `AsRawFd`.][43459]
3495 - [`Rc` and `Arc` now implement `From<&[T]> where T: Clone`, `From<str>`,
3496 `From<String>`, `From<Box<T>> where T: ?Sized`, and `From<Vec<T>>`.][42565]
3501 [`std::mem::discriminant`]
3505 - [You can now call `cargo install` with multiple package names][cargo/4216]
3506 - [Cargo commands inside a virtual workspace will now implicitly
3507 pass `--all`][cargo/4335]
3508 - [Added a `[patch]` section to `Cargo.toml` to handle
3509 prepublication dependencies][cargo/4123] [RFC 1969]
3510 - [`include` & `exclude` fields in `Cargo.toml` now accept gitignore
3511 like patterns][cargo/4270]
3512 - [Added the `--all-targets` option][cargo/4400]
3513 - [Using required dependencies as a feature is now deprecated and emits
3514 a warning][cargo/4364]
3519 - [Cargo docs are moving][43916]
3520 to [doc.rust-lang.org/cargo](https://doc.rust-lang.org/cargo)
3521 - [The rustdoc book is now available][43863]
3522 at [doc.rust-lang.org/rustdoc](https://doc.rust-lang.org/rustdoc)
3523 - [Added a preview of RLS has been made available through rustup][44204]
3524 Install with `rustup component add rls-preview`
3525 - [`std::os` documentation for Unix, Linux, and Windows now appears on doc.rust-lang.org][43348]
3526 Previously only showed `std::os::unix`.
3530 - [Changes in method matching against higher-ranked types][43880] This may cause
3531 breakage in subtyping corner cases. [A more in-depth explanation is available.][info/43880]
3532 - [rustc's JSON error output's byte position start at top of file.][42973]
3533 Was previously relative to the rustc's internal `CodeMap` struct which
3534 required the unstable library `libsyntax` to correctly use.
3535 - [`unused_results` lint no longer ignores booleans][43728]
3537 [42565]: https://github.com/rust-lang/rust/pull/42565
3538 [42973]: https://github.com/rust-lang/rust/pull/42973
3539 [43348]: https://github.com/rust-lang/rust/pull/43348
3540 [43459]: https://github.com/rust-lang/rust/pull/43459
3541 [43506]: https://github.com/rust-lang/rust/pull/43506
3542 [43540]: https://github.com/rust-lang/rust/pull/43540
3543 [43690]: https://github.com/rust-lang/rust/pull/43690
3544 [43728]: https://github.com/rust-lang/rust/pull/43728
3545 [43838]: https://github.com/rust-lang/rust/pull/43838
3546 [43863]: https://github.com/rust-lang/rust/pull/43863
3547 [43880]: https://github.com/rust-lang/rust/pull/43880
3548 [43911]: https://github.com/rust-lang/rust/pull/43911
3549 [43916]: https://github.com/rust-lang/rust/pull/43916
3550 [43917]: https://github.com/rust-lang/rust/pull/43917
3551 [44204]: https://github.com/rust-lang/rust/pull/44204
3552 [cargo/4123]: https://github.com/rust-lang/cargo/pull/4123
3553 [cargo/4216]: https://github.com/rust-lang/cargo/pull/4216
3554 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3555 [cargo/4335]: https://github.com/rust-lang/cargo/pull/4335
3556 [cargo/4364]: https://github.com/rust-lang/cargo/pull/4364
3557 [cargo/4400]: https://github.com/rust-lang/cargo/pull/4400
3558 [RFC 1969]: https://github.com/rust-lang/rfcs/pull/1969
3559 [info/43880]: https://github.com/rust-lang/rust/issues/44224#issuecomment-330058902
3560 [`std::mem::discriminant`]: https://doc.rust-lang.org/std/mem/fn.discriminant.html
3562 Version 1.20.0 (2017-08-31)
3563 ===========================
3567 - [Associated constants are now stabilised.][42809]
3568 - [A lot of macro bugs are now fixed.][42913]
3573 - [Struct fields are now properly coerced to the expected field type.][42807]
3574 - [Enabled wasm LLVM backend][42571] WASM can now be built with the
3575 `wasm32-experimental-emscripten` target.
3576 - [Changed some of the error messages to be more helpful.][42033]
3577 - [Add support for RELRO(RELocation Read-Only) for platforms that support
3579 - [rustc now reports the total number of errors on compilation failure][43015]
3580 previously this was only the number of errors in the pass that failed.
3581 - [Expansion in rustc has been sped up 29x.][42533]
3582 - [added `msp430-none-elf` target.][43099]
3583 - [rustc will now suggest one-argument enum variant to fix type mismatch when
3585 - [Fixes backtraces on Redox][43228]
3586 - [rustc now identifies different versions of same crate when absolute paths of
3587 different types match in an error message.][42826]
3593 - [Relaxed Debug constraints on `{HashMap,BTreeMap}::{Keys,Values}`.][42854]
3594 - [Impl `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Debug`, `Hash` for unsized
3596 - [Impl `fmt::{Display, Debug}` for `Ref`, `RefMut`, `MutexGuard`,
3597 `RwLockReadGuard`, `RwLockWriteGuard`][42822]
3598 - [Impl `Clone` for `DefaultHasher`.][42799]
3599 - [Impl `Sync` for `SyncSender`.][42397]
3600 - [Impl `FromStr` for `char`][42271]
3601 - [Fixed how `{f32, f64}::{is_sign_negative, is_sign_positive}` handles
3603 - [allow messages in the `unimplemented!()` macro.][42155]
3604 ie. `unimplemented!("Waiting for 1.21 to be stable")`
3605 - [`pub(restricted)` is now supported in the `thread_local!` macro.][43185]
3606 - [Upgrade to Unicode 10.0.0][42999]
3607 - [Reimplemented `{f32, f64}::{min, max}` in Rust instead of using CMath.][42430]
3608 - [Skip the main thread's manual stack guard on Linux][43072]
3609 - [Iterator::nth for `ops::{Range, RangeFrom}` is now done in O(1) time][43077]
3610 - [`#[repr(align(N))]` attribute max number is now 2^31 - 1.][43097] This was
3612 - [`{OsStr, Path}::Display` now avoids allocations where possible][42613]
3617 - [`CStr::into_c_string`]
3618 - [`CString::as_c_str`]
3619 - [`CString::into_boxed_c_str`]
3620 - [`Chain::get_mut`]
3621 - [`Chain::get_ref`]
3622 - [`Chain::into_inner`]
3623 - [`Option::get_or_insert_with`]
3624 - [`Option::get_or_insert`]
3625 - [`OsStr::into_os_string`]
3626 - [`OsString::into_boxed_os_str`]
3629 - [`Utf8Error::error_len`]
3630 - [`char::EscapeDebug`]
3631 - [`char::escape_debug`]
3632 - [`compile_error!`]
3633 - [`f32::from_bits`]
3635 - [`f64::from_bits`]
3637 - [`mem::ManuallyDrop`]
3638 - [`slice::sort_unstable_by_key`]
3639 - [`slice::sort_unstable_by`]
3640 - [`slice::sort_unstable`]
3641 - [`str::from_boxed_utf8_unchecked`]
3642 - [`str::as_bytes_mut`]
3643 - [`str::as_bytes_mut`]
3644 - [`str::from_utf8_mut`]
3645 - [`str::from_utf8_unchecked_mut`]
3647 - [`str::get_unchecked_mut`]
3648 - [`str::get_unchecked`]
3650 - [`str::into_boxed_bytes`]
3655 - [Cargo API token location moved from `~/.cargo/config` to
3656 `~/.cargo/credentials`.][cargo/3978]
3657 - [Cargo will now build `main.rs` binaries that are in sub-directories of
3658 `src/bin`.][cargo/4214] ie. Having `src/bin/server/main.rs` and
3659 `src/bin/client/main.rs` generates `target/debug/server` and `target/debug/client`
3660 - [You can now specify version of a binary when installed through
3661 `cargo install` using `--vers`.][cargo/4229]
3662 - [Added `--no-fail-fast` flag to cargo to run all benchmarks regardless of
3663 failure.][cargo/4248]
3664 - [Changed the convention around which file is the crate root.][cargo/4259]
3665 - [The `include`/`exclude` property in `Cargo.toml` now accepts gitignore paths
3666 instead of glob patterns][cargo/4270]. Glob patterns are now deprecated.
3671 - [Functions with `'static` in their return types will now not be as usable as
3672 if they were using lifetime parameters instead.][42417]
3673 - [The reimplementation of `{f32, f64}::is_sign_{negative, positive}` now
3674 takes the sign of NaN into account where previously didn't.][42430]
3676 [42033]: https://github.com/rust-lang/rust/pull/42033
3677 [42155]: https://github.com/rust-lang/rust/pull/42155
3678 [42271]: https://github.com/rust-lang/rust/pull/42271
3679 [42397]: https://github.com/rust-lang/rust/pull/42397
3680 [42417]: https://github.com/rust-lang/rust/pull/42417
3681 [42430]: https://github.com/rust-lang/rust/pull/42430
3682 [42431]: https://github.com/rust-lang/rust/pull/42431
3683 [42533]: https://github.com/rust-lang/rust/pull/42533
3684 [42571]: https://github.com/rust-lang/rust/pull/42571
3685 [42613]: https://github.com/rust-lang/rust/pull/42613
3686 [42799]: https://github.com/rust-lang/rust/pull/42799
3687 [42807]: https://github.com/rust-lang/rust/pull/42807
3688 [42809]: https://github.com/rust-lang/rust/pull/42809
3689 [42822]: https://github.com/rust-lang/rust/pull/42822
3690 [42826]: https://github.com/rust-lang/rust/pull/42826
3691 [42854]: https://github.com/rust-lang/rust/pull/42854
3692 [42913]: https://github.com/rust-lang/rust/pull/42913
3693 [42999]: https://github.com/rust-lang/rust/pull/42999
3694 [43011]: https://github.com/rust-lang/rust/pull/43011
3695 [43015]: https://github.com/rust-lang/rust/pull/43015
3696 [43072]: https://github.com/rust-lang/rust/pull/43072
3697 [43077]: https://github.com/rust-lang/rust/pull/43077
3698 [43097]: https://github.com/rust-lang/rust/pull/43097
3699 [43099]: https://github.com/rust-lang/rust/pull/43099
3700 [43170]: https://github.com/rust-lang/rust/pull/43170
3701 [43178]: https://github.com/rust-lang/rust/pull/43178
3702 [43185]: https://github.com/rust-lang/rust/pull/43185
3703 [43228]: https://github.com/rust-lang/rust/pull/43228
3704 [cargo/3978]: https://github.com/rust-lang/cargo/pull/3978
3705 [cargo/4214]: https://github.com/rust-lang/cargo/pull/4214
3706 [cargo/4229]: https://github.com/rust-lang/cargo/pull/4229
3707 [cargo/4248]: https://github.com/rust-lang/cargo/pull/4248
3708 [cargo/4259]: https://github.com/rust-lang/cargo/pull/4259
3709 [cargo/4270]: https://github.com/rust-lang/cargo/pull/4270
3710 [`CStr::into_c_string`]: https://doc.rust-lang.org/std/ffi/struct.CStr.html#method.into_c_string
3711 [`CString::as_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.as_c_str
3712 [`CString::into_boxed_c_str`]: https://doc.rust-lang.org/std/ffi/struct.CString.html#method.into_boxed_c_str
3713 [`Chain::get_mut`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_mut
3714 [`Chain::get_ref`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.get_ref
3715 [`Chain::into_inner`]: https://doc.rust-lang.org/std/io/struct.Chain.html#method.into_inner
3716 [`Option::get_or_insert_with`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert_with
3717 [`Option::get_or_insert`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.get_or_insert
3718 [`OsStr::into_os_string`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html#method.into_os_string
3719 [`OsString::into_boxed_os_str`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.into_boxed_os_str
3720 [`Take::get_mut`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_mut
3721 [`Take::get_ref`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.get_ref
3722 [`Utf8Error::error_len`]: https://doc.rust-lang.org/std/str/struct.Utf8Error.html#method.error_len
3723 [`char::EscapeDebug`]: https://doc.rust-lang.org/std/char/struct.EscapeDebug.html
3724 [`char::escape_debug`]: https://doc.rust-lang.org/std/primitive.char.html#method.escape_debug
3725 [`compile_error!`]: https://doc.rust-lang.org/std/macro.compile_error.html
3726 [`f32::from_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.from_bits
3727 [`f32::to_bits`]: https://doc.rust-lang.org/std/primitive.f32.html#method.to_bits
3728 [`f64::from_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.from_bits
3729 [`f64::to_bits`]: https://doc.rust-lang.org/std/primitive.f64.html#method.to_bits
3730 [`mem::ManuallyDrop`]: https://doc.rust-lang.org/std/mem/union.ManuallyDrop.html
3731 [`slice::sort_unstable_by_key`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by_key
3732 [`slice::sort_unstable_by`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable_by
3733 [`slice::sort_unstable`]: https://doc.rust-lang.org/std/primitive.slice.html#method.sort_unstable
3734 [`str::from_boxed_utf8_unchecked`]: https://doc.rust-lang.org/std/str/fn.from_boxed_utf8_unchecked.html
3735 [`str::as_bytes_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.as_bytes_mut
3736 [`str::from_utf8_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_mut.html
3737 [`str::from_utf8_unchecked_mut`]: https://doc.rust-lang.org/std/str/fn.from_utf8_unchecked_mut.html
3738 [`str::get_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_mut
3739 [`str::get_unchecked_mut`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked_mut
3740 [`str::get_unchecked`]: https://doc.rust-lang.org/std/primitive.str.html#method.get_unchecked
3741 [`str::get`]: https://doc.rust-lang.org/std/primitive.str.html#method.get
3742 [`str::into_boxed_bytes`]: https://doc.rust-lang.org/std/primitive.str.html#method.into_boxed_bytes
3745 Version 1.19.0 (2017-07-20)
3746 ===========================
3751 - [Numeric fields can now be used for creating tuple structs.][41145] [RFC 1506]
3752 For example `struct Point(u32, u32); let x = Point { 0: 7, 1: 0 };`.
3753 - [Macro recursion limit increased to 1024 from 64.][41676]
3754 - [Added lint for detecting unused macros.][41907]
3755 - [`loop` can now return a value with `break`.][42016] [RFC 1624]
3756 For example: `let x = loop { break 7; };`
3757 - [C compatible `union`s are now available.][42068] [RFC 1444] They can only
3758 contain `Copy` types and cannot have a `Drop` implementation.
3759 Example: `union Foo { bar: u8, baz: usize }`
3760 - [Non capturing closures can now be coerced into `fn`s,][42162] [RFC 1558]
3761 Example: `let foo: fn(u8) -> u8 = |v: u8| { v };`
3766 - [Add support for bootstrapping the Rust compiler toolchain on Android.][41370]
3767 - [Change `arm-linux-androideabi` to correspond to the `armeabi`
3768 official ABI.][41656] If you wish to continue targeting the `armeabi-v7a` ABI
3769 you should use `--target armv7-linux-androideabi`.
3770 - [Fixed ICE when removing a source file between compilation sessions.][41873]
3771 - [Minor optimisation of string operations.][42037]
3772 - [Compiler error message is now `aborting due to previous error(s)` instead of
3773 `aborting due to N previous errors`][42150] This was previously inaccurate and
3774 would only count certain kinds of errors.
3775 - [The compiler now supports Visual Studio 2017][42225]
3776 - [The compiler is now built against LLVM 4.0.1 by default][42948]
3777 - [Added a lot][42264] of [new error codes][42302]
3778 - [Added `target-feature=+crt-static` option][37406] [RFC 1721] Which allows
3779 libraries with C Run-time Libraries(CRT) to be statically linked.
3780 - [Fixed various ARM codegen bugs][42740]
3785 - [`String` now implements `FromIterator<Cow<'a, str>>` and
3786 `Extend<Cow<'a, str>>`][41449]
3787 - [`Vec` now implements `From<&mut [T]>`][41530]
3788 - [`Box<[u8]>` now implements `From<Box<str>>`][41258]
3789 - [`SplitWhitespace` now implements `Clone`][41659]
3790 - [`[u8]::reverse` is now 5x faster and `[u16]::reverse` is now
3792 - [`eprint!` and `eprintln!` macros added to prelude.][41192] Same as the `print!`
3793 macros, but for printing to stderr.
3798 - [`OsString::shrink_to_fit`]
3801 - [`thread::ThreadId`]
3806 - [Build scripts can now add environment variables to the environment
3807 the crate is being compiled in.
3808 Example: `println!("cargo:rustc-env=FOO=bar");`][cargo/3929]
3809 - [Subcommands now replace the current process rather than spawning a new
3810 child process][cargo/3970]
3811 - [Workspace members can now accept glob file patterns][cargo/3979]
3812 - [Added `--all` flag to the `cargo bench` subcommand to run benchmarks of all
3813 the members in a given workspace.][cargo/3988]
3814 - [Updated `libssh2-sys` to 0.2.6][cargo/4008]
3815 - [Target directory path is now in the cargo metadata][cargo/4022]
3816 - [Cargo no longer checks out a local working directory for the
3817 crates.io index][cargo/4026] This should provide smaller file size for the
3818 registry, and improve cloning times, especially on Windows machines.
3819 - [Added an `--exclude` option for excluding certain packages when using the
3820 `--all` option][cargo/4031]
3821 - [Cargo will now automatically retry when receiving a 5xx error
3822 from crates.io][cargo/4032]
3823 - [The `--features` option now accepts multiple comma or space
3824 delimited values.][cargo/4084]
3825 - [Added support for custom target specific runners][cargo/3954]
3830 - [Added `rust-windbg.cmd`][39983] for loading rust `.natvis` files in the
3832 - [Rust will now release XZ compressed packages][rust-installer/57]
3833 - [rustup will now prefer to download rust packages with
3834 XZ compression][rustup/1100] over GZip packages.
3835 - [Added the ability to escape `#` in rust documentation][41785] By adding
3836 additional `#`'s ie. `##` is now `#`
3841 - [`MutexGuard<T>` may only be `Sync` if `T` is `Sync`.][41624]
3842 - [`-Z` flags are now no longer allowed to be used on the stable
3843 compiler.][41751] This has been a warning for a year previous to this.
3844 - [As a result of the `-Z` flag change, the `cargo-check` plugin no
3845 longer works][42844]. Users should migrate to the built-in `check`
3846 command, which has been available since 1.16.
3847 - [Ending a float literal with `._` is now a hard error.
3848 Example: `42._` .][41946]
3849 - [Any use of a private `extern crate` outside of its module is now a
3850 hard error.][36886] This was previously a warning.
3851 - [`use ::self::foo;` is now a hard error.][36888] `self` paths are always
3852 relative while the `::` prefix makes a path absolute, but was ignored and the
3853 path was relative regardless.
3854 - [Floating point constants in match patterns is now a hard error][36890]
3855 This was previously a warning.
3856 - [Struct or enum constants that don't derive `PartialEq` & `Eq` used
3857 match patterns is now a hard error][36891] This was previously a warning.
3858 - [Lifetimes named `'_` are no longer allowed.][36892] This was previously
3860 - [From the pound escape, lines consisting of multiple `#`s are
3862 - [It is an error to re-export private enum variants][42460]. This is
3863 known to break a number of crates that depend on an older version of
3865 - [On Windows, if `VCINSTALLDIR` is set incorrectly, `rustc` will try
3866 to use it to find the linker, and the build will fail where it did
3867 not previously][42607]
3869 [36886]: https://github.com/rust-lang/rust/issues/36886
3870 [36888]: https://github.com/rust-lang/rust/issues/36888
3871 [36890]: https://github.com/rust-lang/rust/issues/36890
3872 [36891]: https://github.com/rust-lang/rust/issues/36891
3873 [36892]: https://github.com/rust-lang/rust/issues/36892
3874 [37406]: https://github.com/rust-lang/rust/issues/37406
3875 [39983]: https://github.com/rust-lang/rust/pull/39983
3876 [41145]: https://github.com/rust-lang/rust/pull/41145
3877 [41192]: https://github.com/rust-lang/rust/pull/41192
3878 [41258]: https://github.com/rust-lang/rust/pull/41258
3879 [41370]: https://github.com/rust-lang/rust/pull/41370
3880 [41449]: https://github.com/rust-lang/rust/pull/41449
3881 [41530]: https://github.com/rust-lang/rust/pull/41530
3882 [41624]: https://github.com/rust-lang/rust/pull/41624
3883 [41656]: https://github.com/rust-lang/rust/pull/41656
3884 [41659]: https://github.com/rust-lang/rust/pull/41659
3885 [41676]: https://github.com/rust-lang/rust/pull/41676
3886 [41751]: https://github.com/rust-lang/rust/pull/41751
3887 [41764]: https://github.com/rust-lang/rust/pull/41764
3888 [41785]: https://github.com/rust-lang/rust/pull/41785
3889 [41873]: https://github.com/rust-lang/rust/pull/41873
3890 [41907]: https://github.com/rust-lang/rust/pull/41907
3891 [41946]: https://github.com/rust-lang/rust/pull/41946
3892 [42016]: https://github.com/rust-lang/rust/pull/42016
3893 [42037]: https://github.com/rust-lang/rust/pull/42037
3894 [42068]: https://github.com/rust-lang/rust/pull/42068
3895 [42150]: https://github.com/rust-lang/rust/pull/42150
3896 [42162]: https://github.com/rust-lang/rust/pull/42162
3897 [42225]: https://github.com/rust-lang/rust/pull/42225
3898 [42264]: https://github.com/rust-lang/rust/pull/42264
3899 [42302]: https://github.com/rust-lang/rust/pull/42302
3900 [42460]: https://github.com/rust-lang/rust/issues/42460
3901 [42607]: https://github.com/rust-lang/rust/issues/42607
3902 [42740]: https://github.com/rust-lang/rust/pull/42740
3903 [42844]: https://github.com/rust-lang/rust/issues/42844
3904 [42948]: https://github.com/rust-lang/rust/pull/42948
3905 [RFC 1444]: https://github.com/rust-lang/rfcs/pull/1444
3906 [RFC 1506]: https://github.com/rust-lang/rfcs/pull/1506
3907 [RFC 1558]: https://github.com/rust-lang/rfcs/pull/1558
3908 [RFC 1624]: https://github.com/rust-lang/rfcs/pull/1624
3909 [RFC 1721]: https://github.com/rust-lang/rfcs/pull/1721
3910 [`Command::envs`]: https://doc.rust-lang.org/std/process/struct.Command.html#method.envs
3911 [`OsString::shrink_to_fit`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html#method.shrink_to_fit
3912 [`cmp::Reverse`]: https://doc.rust-lang.org/std/cmp/struct.Reverse.html
3913 [`thread::ThreadId`]: https://doc.rust-lang.org/std/thread/struct.ThreadId.html
3914 [cargo/3929]: https://github.com/rust-lang/cargo/pull/3929
3915 [cargo/3954]: https://github.com/rust-lang/cargo/pull/3954
3916 [cargo/3970]: https://github.com/rust-lang/cargo/pull/3970
3917 [cargo/3979]: https://github.com/rust-lang/cargo/pull/3979
3918 [cargo/3988]: https://github.com/rust-lang/cargo/pull/3988
3919 [cargo/4008]: https://github.com/rust-lang/cargo/pull/4008
3920 [cargo/4022]: https://github.com/rust-lang/cargo/pull/4022
3921 [cargo/4026]: https://github.com/rust-lang/cargo/pull/4026
3922 [cargo/4031]: https://github.com/rust-lang/cargo/pull/4031
3923 [cargo/4032]: https://github.com/rust-lang/cargo/pull/4032
3924 [cargo/4084]: https://github.com/rust-lang/cargo/pull/4084
3925 [rust-installer/57]: https://github.com/rust-lang/rust-installer/pull/57
3926 [rustup/1100]: https://github.com/rust-lang-nursery/rustup.rs/pull/1100
3929 Version 1.18.0 (2017-06-08)
3930 ===========================
3935 - [Stabilize pub(restricted)][40556] `pub` can now accept a module path to
3936 make the item visible to just that module tree. Also accepts the keyword
3937 `crate` to make something public to the whole crate but not users of the
3938 library. Example: `pub(crate) mod utils;`. [RFC 1422].
3939 - [Stabilize `#![windows_subsystem]` attribute][40870] conservative exposure of the
3940 `/SUBSYSTEM` linker flag on Windows platforms. [RFC 1665].
3941 - [Refactor of trait object type parsing][40043] Now `ty` in macros can accept
3942 types like `Write + Send`, trailing `+` are now supported in trait objects,
3943 and better error reporting for trait objects starting with `?Sized`.
3944 - [0e+10 is now a valid floating point literal][40589]
3945 - [Now warns if you bind a lifetime parameter to 'static][40734]
3946 - [Tuples, Enum variant fields, and structs with no `repr` attribute or with
3947 `#[repr(Rust)]` are reordered to minimize padding and produce a smaller
3948 representation in some cases.][40377]
3953 - [rustc can now emit mir with `--emit mir`][39891]
3954 - [Improved LLVM IR for trivial functions][40367]
3955 - [Added explanation for E0090(Wrong number of lifetimes are supplied)][40723]
3956 - [rustc compilation is now 15%-20% faster][41469] Thanks to optimisation
3957 opportunities found through profiling
3958 - [Improved backtrace formatting when panicking][38165]
3963 - [Specialized `Vec::from_iter` being passed `vec::IntoIter`][40731] if the
3964 iterator hasn't been advanced the original `Vec` is reassembled with no actual
3965 iteration or reallocation.
3966 - [Simplified HashMap Bucket interface][40561] provides performance
3967 improvements for iterating and cloning.
3968 - [Specialize Vec::from_elem to use calloc][40409]
3969 - [Fixed Race condition in fs::create_dir_all][39799]
3970 - [No longer caching stdio on Windows][40516]
3971 - [Optimized insertion sort in slice][40807] insertion sort in some cases
3972 2.50%~ faster and in one case now 12.50% faster.
3973 - [Optimized `AtomicBool::fetch_nand`][41143]
3978 - [`Child::try_wait`]
3979 - [`HashMap::retain`]
3980 - [`HashSet::retain`]
3982 - [`TcpStream::peek`]
3983 - [`UdpSocket::peek`]
3984 - [`UdpSocket::peek_from`]
3989 - [Added partial Pijul support][cargo/3842] Pijul is a version control system in Rust.
3990 You can now create new cargo projects with Pijul using `cargo new --vcs pijul`
3991 - [Now always emits build script warnings for crates that fail to build][cargo/3847]
3992 - [Added Android build support][cargo/3885]
3993 - [Added `--bins` and `--tests` flags][cargo/3901] now you can build all programs
3994 of a certain type, for example `cargo build --bins` will build all
3996 - [Added support for haiku][cargo/3952]
4001 - [rustdoc can now use pulldown-cmark with the `--enable-commonmark` flag][40338]
4002 - [Added rust-windbg script for better debugging on Windows][39983]
4003 - [Rust now uses the official cross compiler for NetBSD][40612]
4004 - [rustdoc now accepts `#` at the start of files][40828]
4005 - [Fixed jemalloc support for musl][41168]
4010 - [Changes to how the `0` flag works in format!][40241] Padding zeroes are now
4011 always placed after the sign if it exists and before the digits. With the `#`
4012 flag the zeroes are placed after the prefix and before the digits.
4013 - [Due to the struct field optimisation][40377], using `transmute` on structs
4014 that have no `repr` attribute or `#[repr(Rust)]` will no longer work. This has
4015 always been undefined behavior, but is now more likely to break in practice.
4016 - [The refactor of trait object type parsing][40043] fixed a bug where `+` was
4017 receiving the wrong priority parsing things like `&for<'a> Tr<'a> + Send` as
4018 `&(for<'a> Tr<'a> + Send)` instead of `(&for<'a> Tr<'a>) + Send`
4019 - [Overlapping inherent `impl`s are now a hard error][40728]
4020 - [`PartialOrd` and `Ord` must agree on the ordering.][41270]
4021 - [`rustc main.rs -o out --emit=asm,llvm-ir`][41085] Now will output
4022 `out.asm` and `out.ll` instead of only one of the filetypes.
4023 - [ calling a function that returns `Self` will no longer work][41805] when
4024 the size of `Self` cannot be statically determined.
4025 - [rustc now builds with a "pthreads" flavour of MinGW for Windows GNU][40805]
4026 this has caused a few regressions namely:
4028 - Changed the link order of local static/dynamic libraries (respecting the
4029 order on given rather than having the compiler reorder).
4030 - Changed how MinGW is linked, native code linked to dynamic libraries
4031 may require manually linking to the gcc support library (for the native
4034 [38165]: https://github.com/rust-lang/rust/pull/38165
4035 [39799]: https://github.com/rust-lang/rust/pull/39799
4036 [39891]: https://github.com/rust-lang/rust/pull/39891
4037 [39983]: https://github.com/rust-lang/rust/pull/39983
4038 [40043]: https://github.com/rust-lang/rust/pull/40043
4039 [40241]: https://github.com/rust-lang/rust/pull/40241
4040 [40338]: https://github.com/rust-lang/rust/pull/40338
4041 [40367]: https://github.com/rust-lang/rust/pull/40367
4042 [40377]: https://github.com/rust-lang/rust/pull/40377
4043 [40409]: https://github.com/rust-lang/rust/pull/40409
4044 [40516]: https://github.com/rust-lang/rust/pull/40516
4045 [40556]: https://github.com/rust-lang/rust/pull/40556
4046 [40561]: https://github.com/rust-lang/rust/pull/40561
4047 [40589]: https://github.com/rust-lang/rust/pull/40589
4048 [40612]: https://github.com/rust-lang/rust/pull/40612
4049 [40723]: https://github.com/rust-lang/rust/pull/40723
4050 [40728]: https://github.com/rust-lang/rust/pull/40728
4051 [40731]: https://github.com/rust-lang/rust/pull/40731
4052 [40734]: https://github.com/rust-lang/rust/pull/40734
4053 [40805]: https://github.com/rust-lang/rust/pull/40805
4054 [40807]: https://github.com/rust-lang/rust/pull/40807
4055 [40828]: https://github.com/rust-lang/rust/pull/40828
4056 [40870]: https://github.com/rust-lang/rust/pull/40870
4057 [41085]: https://github.com/rust-lang/rust/pull/41085
4058 [41143]: https://github.com/rust-lang/rust/pull/41143
4059 [41168]: https://github.com/rust-lang/rust/pull/41168
4060 [41270]: https://github.com/rust-lang/rust/issues/41270
4061 [41469]: https://github.com/rust-lang/rust/pull/41469
4062 [41805]: https://github.com/rust-lang/rust/issues/41805
4063 [RFC 1422]: https://github.com/rust-lang/rfcs/blob/master/text/1422-pub-restricted.md
4064 [RFC 1665]: https://github.com/rust-lang/rfcs/blob/master/text/1665-windows-subsystem.md
4065 [`Child::try_wait`]: https://doc.rust-lang.org/std/process/struct.Child.html#method.try_wait
4066 [`HashMap::retain`]: https://doc.rust-lang.org/std/collections/struct.HashMap.html#method.retain
4067 [`HashSet::retain`]: https://doc.rust-lang.org/std/collections/struct.HashSet.html#method.retain
4068 [`PeekMut::pop`]: https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html#method.pop
4069 [`TcpStream::peek`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html#method.peek
4070 [`UdpSocket::peek_from`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek_from
4071 [`UdpSocket::peek`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html#method.peek
4072 [cargo/3842]: https://github.com/rust-lang/cargo/pull/3842
4073 [cargo/3847]: https://github.com/rust-lang/cargo/pull/3847
4074 [cargo/3885]: https://github.com/rust-lang/cargo/pull/3885
4075 [cargo/3901]: https://github.com/rust-lang/cargo/pull/3901
4076 [cargo/3952]: https://github.com/rust-lang/cargo/pull/3952
4079 Version 1.17.0 (2017-04-27)
4080 ===========================
4085 * [The lifetime of statics and consts defaults to `'static`][39265]. [RFC 1623]
4086 * [Fields of structs may be initialized without duplicating the field/variable
4087 names][39761]. [RFC 1682]
4088 * [`Self` may be included in the `where` clause of `impls`][38864]. [RFC 1647]
4089 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4090 there is no subtyping between `T` and `U` when `T: Unsize<U>`. For example,
4091 coercing `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to
4092 `'b`. Soundness fix.
4093 * [Values passed to the indexing operator, `[]`, automatically coerce][40166]
4094 * [Static variables may contain references to other statics][40027]
4099 * [Exit quickly on only `--emit dep-info`][40336]
4100 * [Make `-C relocation-model` more correctly determine whether the linker
4101 creates a position-independent executable][40245]
4102 * [Add `-C overflow-checks` to directly control whether integer overflow
4104 * [The rustc type checker now checks items on demand instead of in a single
4105 in-order pass][40008]. This is mostly an internal refactoring in support of
4106 future work, including incremental type checking, but also resolves [RFC
4107 1647], allowing `Self` to appear in `impl` `where` clauses.
4108 * [Optimize vtable loads][39995]
4109 * [Turn off vectorization for Emscripten targets][39990]
4110 * [Provide suggestions for unknown macros imported with `use`][39953]
4111 * [Fix ICEs in path resolution][39939]
4112 * [Strip exception handling code on Emscripten when `panic=abort`][39193]
4113 * [Add clearer error message using `&str + &str`][39116]
4124 * [`Ordering::then`]
4125 * [`Ordering::then_with`]
4126 * [`BTreeMap::range`]
4127 * [`BTreeMap::range_mut`]
4128 * [`collections::Bound`]
4129 * [`process::abort`]
4130 * [`ptr::read_unaligned`]
4131 * [`ptr::write_unaligned`]
4132 * [`Result::expect_err`]
4135 * [`Cell::into_inner`]
4141 * [`BTreeMap` and `BTreeSet` can iterate over ranges][27787]
4142 * [`Cell` can store non-`Copy` types][39793]. [RFC 1651]
4143 * [`String` implements `FromIterator<&char>`][40028]
4144 * `Box` [implements][40009] a number of new conversions:
4145 `From<Box<str>> for String`,
4146 `From<Box<[T]>> for Vec<T>`,
4147 `From<Box<CStr>> for CString`,
4148 `From<Box<OsStr>> for OsString`,
4149 `From<Box<Path>> for PathBuf`,
4150 `Into<Box<str>> for String`,
4151 `Into<Box<[T]>> for Vec<T>`,
4152 `Into<Box<CStr>> for CString`,
4153 `Into<Box<OsStr>> for OsString`,
4154 `Into<Box<Path>> for PathBuf`,
4155 `Default for Box<str>`,
4156 `Default for Box<CStr>`,
4157 `Default for Box<OsStr>`,
4158 `From<&CStr> for Box<CStr>`,
4159 `From<&OsStr> for Box<OsStr>`,
4160 `From<&Path> for Box<Path>`
4161 * [`ffi::FromBytesWithNulError` implements `Error` and `Display`][39960]
4162 * [Specialize `PartialOrd<A> for [A] where A: Ord`][39642]
4163 * [Slightly optimize `slice::sort`][39538]
4164 * [Add `ToString` trait specialization for `Cow<'a, str>` and `String`][39440]
4165 * [`Box<[T]>` implements `From<&[T]> where T: Copy`,
4166 `Box<str>` implements `From<&str>`][39438]
4167 * [`IpAddr` implements `From` for various arrays. `SocketAddr` implements
4168 `From<(I, u16)> where I: Into<IpAddr>`][39372]
4169 * [`format!` estimates the needed capacity before writing a string][39356]
4170 * [Support unprivileged symlink creation in Windows][38921]
4171 * [`PathBuf` implements `Default`][38764]
4172 * [Implement `PartialEq<[A]>` for `VecDeque<A>`][38661]
4173 * [`HashMap` resizes adaptively][38368] to guard against DOS attacks
4174 and poor hash functions.
4179 * [Add `cargo check --all`][cargo/3731]
4180 * [Add an option to ignore SSL revocation checking][cargo/3699]
4181 * [Add `cargo run --package`][cargo/3691]
4182 * [Add `required_features`][cargo/3667]
4183 * [Assume `build.rs` is a build script][cargo/3664]
4184 * [Find workspace via `workspace_root` link in containing member][cargo/3562]
4189 * [Documentation is rendered with mdbook instead of the obsolete, in-tree
4191 * [The "Unstable Book" documents nightly-only features][ubook]
4192 * [Improve the style of the sidebar in rustdoc output][40265]
4193 * [Configure build correctly on 64-bit CPU's with the armhf ABI][40261]
4194 * [Fix MSP430 breakage due to `i128`][40257]
4195 * [Preliminary Solaris/SPARCv9 support][39903]
4196 * [`rustc` is linked statically on Windows MSVC targets][39837], allowing it to
4197 run without installing the MSVC runtime.
4198 * [`rustdoc --test` includes file names in test names][39788]
4199 * This release includes builds of `std` for `sparc64-unknown-linux-gnu`,
4200 `aarch64-unknown-linux-fuchsia`, and `x86_64-unknown-linux-fuchsia`.
4201 * [Initial support for `aarch64-unknown-freebsd`][39491]
4202 * [Initial support for `i686-unknown-netbsd`][39426]
4203 * [This release no longer includes the old makefile build system][39431]. Rust
4204 is built with a custom build system, written in Rust, and with Cargo.
4205 * [Add Debug implementations for libcollection structs][39002]
4206 * [`TypeId` implements `PartialOrd` and `Ord`][38981]
4207 * [`--test-threads=0` produces an error][38945]
4208 * [`rustup` installs documentation by default][40526]
4209 * [The Rust source includes NatVis visualizations][39843]. These can be used by
4210 WinDbg and Visual Studio to improve the debugging experience.
4215 * [Rust 1.17 does not correctly detect the MSVC 2017 linker][38584]. As a
4216 workaround, either use MSVC 2015 or run vcvars.bat.
4217 * [When coercing to an unsized type lifetimes must be equal][40319]. That is,
4218 disallow subtyping between `T` and `U` when `T: Unsize<U>`, e.g. coercing
4219 `&mut [&'a X; N]` to `&mut [&'b X]` requires `'a` be equal to `'b`. Soundness
4221 * [`format!` and `Display::to_string` panic if an underlying formatting
4222 implementation returns an error][40117]. Previously the error was silently
4223 ignored. It is incorrect for `write_fmt` to return an error when writing
4225 * [In-tree crates are verified to be unstable][39851]. Previously, some minor
4226 crates were marked stable and could be accessed from the stable toolchain.
4227 * [Rust git source no longer includes vendored crates][39728]. Those that need
4228 to build with vendored crates should build from release tarballs.
4229 * [Fix inert attributes from `proc_macro_derives`][39572]
4230 * [During crate resolution, rustc prefers a crate in the sysroot if two crates
4231 are otherwise identical][39518]. Unlikely to be encountered outside the Rust
4233 * [Fixed bugs around how type inference interacts with dead-code][39485]. The
4234 existing code generally ignores the type of dead-code unless a type-hint is
4235 provided; this can cause surprising inference interactions particularly around
4236 defaulting. The new code uniformly ignores the result type of dead-code.
4237 * [Tuple-struct constructors with private fields are no longer visible][38932]
4238 * [Lifetime parameters that do not appear in the arguments are now considered
4239 early-bound][38897], resolving a soundness bug (#[32330]). The
4240 `hr_lifetime_in_assoc_type` future-compatibility lint has been in effect since
4242 * [rustdoc: fix doctests with non-feature crate attributes][38161]
4243 * [Make transmuting from fn item types to pointer-sized types a hard
4246 [27787]: https://github.com/rust-lang/rust/issues/27787
4247 [32330]: https://github.com/rust-lang/rust/issues/32330
4248 [34198]: https://github.com/rust-lang/rust/pull/34198
4249 [38161]: https://github.com/rust-lang/rust/pull/38161
4250 [38368]: https://github.com/rust-lang/rust/pull/38368
4251 [38584]: https://github.com/rust-lang/rust/issues/38584
4252 [38661]: https://github.com/rust-lang/rust/pull/38661
4253 [38764]: https://github.com/rust-lang/rust/pull/38764
4254 [38864]: https://github.com/rust-lang/rust/issues/38864
4255 [38897]: https://github.com/rust-lang/rust/pull/38897
4256 [38921]: https://github.com/rust-lang/rust/pull/38921
4257 [38932]: https://github.com/rust-lang/rust/pull/38932
4258 [38945]: https://github.com/rust-lang/rust/pull/38945
4259 [38981]: https://github.com/rust-lang/rust/pull/38981
4260 [39002]: https://github.com/rust-lang/rust/pull/39002
4261 [39116]: https://github.com/rust-lang/rust/pull/39116
4262 [39193]: https://github.com/rust-lang/rust/pull/39193
4263 [39265]: https://github.com/rust-lang/rust/pull/39265
4264 [39356]: https://github.com/rust-lang/rust/pull/39356
4265 [39372]: https://github.com/rust-lang/rust/pull/39372
4266 [39426]: https://github.com/rust-lang/rust/pull/39426
4267 [39431]: https://github.com/rust-lang/rust/pull/39431
4268 [39438]: https://github.com/rust-lang/rust/pull/39438
4269 [39440]: https://github.com/rust-lang/rust/pull/39440
4270 [39485]: https://github.com/rust-lang/rust/pull/39485
4271 [39491]: https://github.com/rust-lang/rust/pull/39491
4272 [39518]: https://github.com/rust-lang/rust/pull/39518
4273 [39538]: https://github.com/rust-lang/rust/pull/39538
4274 [39572]: https://github.com/rust-lang/rust/pull/39572
4275 [39633]: https://github.com/rust-lang/rust/pull/39633
4276 [39642]: https://github.com/rust-lang/rust/pull/39642
4277 [39728]: https://github.com/rust-lang/rust/pull/39728
4278 [39761]: https://github.com/rust-lang/rust/pull/39761
4279 [39788]: https://github.com/rust-lang/rust/pull/39788
4280 [39793]: https://github.com/rust-lang/rust/pull/39793
4281 [39837]: https://github.com/rust-lang/rust/pull/39837
4282 [39843]: https://github.com/rust-lang/rust/pull/39843
4283 [39851]: https://github.com/rust-lang/rust/pull/39851
4284 [39903]: https://github.com/rust-lang/rust/pull/39903
4285 [39939]: https://github.com/rust-lang/rust/pull/39939
4286 [39953]: https://github.com/rust-lang/rust/pull/39953
4287 [39960]: https://github.com/rust-lang/rust/pull/39960
4288 [39990]: https://github.com/rust-lang/rust/pull/39990
4289 [39995]: https://github.com/rust-lang/rust/pull/39995
4290 [40008]: https://github.com/rust-lang/rust/pull/40008
4291 [40009]: https://github.com/rust-lang/rust/pull/40009
4292 [40027]: https://github.com/rust-lang/rust/pull/40027
4293 [40028]: https://github.com/rust-lang/rust/pull/40028
4294 [40037]: https://github.com/rust-lang/rust/pull/40037
4295 [40117]: https://github.com/rust-lang/rust/pull/40117
4296 [40166]: https://github.com/rust-lang/rust/pull/40166
4297 [40245]: https://github.com/rust-lang/rust/pull/40245
4298 [40257]: https://github.com/rust-lang/rust/pull/40257
4299 [40261]: https://github.com/rust-lang/rust/pull/40261
4300 [40265]: https://github.com/rust-lang/rust/pull/40265
4301 [40319]: https://github.com/rust-lang/rust/pull/40319
4302 [40336]: https://github.com/rust-lang/rust/pull/40336
4303 [40526]: https://github.com/rust-lang/rust/pull/40526
4304 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4305 [RFC 1647]: https://github.com/rust-lang/rfcs/blob/master/text/1647-allow-self-in-where-clauses.md
4306 [RFC 1651]: https://github.com/rust-lang/rfcs/blob/master/text/1651-movecell.md
4307 [RFC 1682]: https://github.com/rust-lang/rfcs/blob/master/text/1682-field-init-shorthand.md
4308 [`Arc::from_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.from_raw
4309 [`Arc::into_raw`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.into_raw
4310 [`Arc::ptr_eq`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.ptr_eq
4311 [`BTreeMap::range_mut`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range_mut
4312 [`BTreeMap::range`]: https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.range
4313 [`Cell::into_inner`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.into_inner
4314 [`Cell::replace`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.replace
4315 [`Cell::swap`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.swap
4316 [`Cell::take`]: https://doc.rust-lang.org/std/cell/struct.Cell.html#method.take
4317 [`Ordering::then_with`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then_with
4318 [`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
4319 [`Rc::from_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.from_raw
4320 [`Rc::into_raw`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.into_raw
4321 [`Rc::ptr_eq`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.ptr_eq
4322 [`Result::expect_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.expect_err
4323 [`collections::Bound`]: https://doc.rust-lang.org/std/collections/enum.Bound.html
4324 [`process::abort`]: https://doc.rust-lang.org/std/process/fn.abort.html
4325 [`ptr::read_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.read_unaligned.html
4326 [`ptr::write_unaligned`]: https://doc.rust-lang.org/std/ptr/fn.write_unaligned.html
4327 [cargo/3562]: https://github.com/rust-lang/cargo/pull/3562
4328 [cargo/3664]: https://github.com/rust-lang/cargo/pull/3664
4329 [cargo/3667]: https://github.com/rust-lang/cargo/pull/3667
4330 [cargo/3691]: https://github.com/rust-lang/cargo/pull/3691
4331 [cargo/3699]: https://github.com/rust-lang/cargo/pull/3699
4332 [cargo/3731]: https://github.com/rust-lang/cargo/pull/3731
4333 [mdbook]: https://crates.io/crates/mdbook
4334 [ubook]: https://doc.rust-lang.org/unstable-book/
4337 Version 1.16.0 (2017-03-16)
4338 ===========================
4343 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4344 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4345 match patterns][38069]
4346 * [Clean up semantics of `self` in an import list][38313]
4347 * [`Self` may appear in `impl` headers][38920]
4348 * [`Self` may appear in struct expressions][39282]
4353 * [`rustc` now supports `--emit=metadata`, which causes rustc to emit
4354 a `.rmeta` file containing only crate metadata][38571]. This can be
4355 used by tools like the Rust Language Service to perform
4356 metadata-only builds.
4357 * [Levenshtein based typo suggestions now work in most places, while
4358 previously they worked only for fields and sometimes for local
4359 variables][38927]. Together with the overhaul of "no
4360 resolution"/"unexpected resolution" errors (#[38154]) they result in
4361 large and systematic improvement in resolution diagnostics.
4362 * [Fix `transmute::<T, U>` where `T` requires a bigger alignment than
4364 * [rustc: use -Xlinker when specifying an rpath with ',' in it][38798]
4365 * [`rustc` no longer attempts to provide "consider using an explicit
4366 lifetime" suggestions][37057]. They were inaccurate.
4371 * [`VecDeque::truncate`]
4372 * [`VecDeque::resize`]
4373 * [`String::insert_str`]
4374 * [`Duration::checked_add`]
4375 * [`Duration::checked_sub`]
4376 * [`Duration::checked_div`]
4377 * [`Duration::checked_mul`]
4380 * [`SocketAddr::is_ipv4`]
4381 * [`SocketAddr::is_ipv6`]
4382 * [`IpAddr::is_ipv4`]
4383 * [`IpAddr::is_ipv6`]
4385 * [`Vec::dedup_by_key`]
4386 * [`Result::unwrap_or_default`]
4387 * [`<*const T>::wrapping_offset`]
4388 * [`<*mut T>::wrapping_offset`]
4389 * `CommandExt::creation_flags`
4390 * [`File::set_permissions`]
4391 * [`String::split_off`]
4396 * [`[T]::binary_search` and `[T]::binary_search_by_key` now take
4397 their argument by `Borrow` parameter][37761]
4398 * [All public types in std implement `Debug`][38006]
4399 * [`IpAddr` implements `From<Ipv4Addr>` and `From<Ipv6Addr>`][38327]
4400 * [`Ipv6Addr` implements `From<[u16; 8]>`][38131]
4401 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4403 * [std: Fix partial writes in `LineWriter`][38062]
4404 * [std: Clamp max read/write sizes on Unix][38062]
4405 * [Use more specific panic message for `&str` slicing errors][38066]
4406 * [`TcpListener::set_only_v6` is deprecated][38304]. This
4407 functionality cannot be achieved in std currently.
4408 * [`writeln!`, like `println!`, now accepts a form with no string
4409 or formatting arguments, to just print a newline][38469]
4410 * [Implement `iter::Sum` and `iter::Product` for `Result`][38580]
4411 * [Reduce the size of static data in `std_unicode::tables`][38781]
4412 * [`char::EscapeDebug`, `EscapeDefault`, `EscapeUnicode`,
4413 `CaseMappingIter`, `ToLowercase`, `ToUppercase`, implement
4415 * [`Duration` implements `Sum`][38712]
4416 * [`String` implements `ToSocketAddrs`][39048]
4421 * [The `cargo check` command does a type check of a project without
4422 building it][cargo/3296]
4423 * [crates.io will display CI badges from Travis and AppVeyor, if
4424 specified in Cargo.toml][cargo/3546]
4425 * [crates.io will display categories listed in Cargo.toml][cargo/3301]
4426 * [Compilation profiles accept integer values for `debug`, in addition
4427 to `true` and `false`. These are passed to `rustc` as the value to
4428 `-C debuginfo`][cargo/3534]
4429 * [Implement `cargo --version --verbose`][cargo/3604]
4430 * [All builds now output 'dep-info' build dependencies compatible with
4431 make and ninja][cargo/3557]
4432 * [Build all workspace members with `build --all`][cargo/3511]
4433 * [Document all workspace members with `doc --all`][cargo/3515]
4434 * [Path deps outside workspace are not members][cargo/3443]
4439 * [`rustdoc` has a `--sysroot` argument that, like `rustc`, specifies
4440 the path to the Rust implementation][38589]
4441 * [The `armv7-linux-androideabi` target no longer enables NEON
4442 extensions, per Google's ABI guide][38413]
4443 * [The stock standard library can be compiled for Redox OS][38401]
4444 * [Rust has initial SPARC support][38726]. Tier 3. No builds
4446 * [Rust has experimental support for Nvidia PTX][38559]. Tier 3. No
4448 * [Fix backtraces on i686-pc-windows-gnu by disabling FPO][39379]
4453 * [Uninhabitable enums (those without any variants) no longer permit wildcard
4454 match patterns][38069]
4455 * In this release, references to uninhabited types can not be
4456 pattern-matched. This was accidentally allowed in 1.15.
4457 * [The compiler's `dead_code` lint now accounts for type aliases][38051].
4458 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
4460 * [Clean up semantics of `self` in an import list][38313]
4461 * Reimplemented lifetime elision. This change was almost entirely compatible
4462 with existing code, but it did close a number of small bugs and loopholes,
4463 as well as being more accepting in some other [cases][41105].
4465 [37057]: https://github.com/rust-lang/rust/pull/37057
4466 [37761]: https://github.com/rust-lang/rust/pull/37761
4467 [38006]: https://github.com/rust-lang/rust/pull/38006
4468 [38051]: https://github.com/rust-lang/rust/pull/38051
4469 [38062]: https://github.com/rust-lang/rust/pull/38062
4470 [38062]: https://github.com/rust-lang/rust/pull/38622
4471 [38066]: https://github.com/rust-lang/rust/pull/38066
4472 [38069]: https://github.com/rust-lang/rust/pull/38069
4473 [38131]: https://github.com/rust-lang/rust/pull/38131
4474 [38154]: https://github.com/rust-lang/rust/pull/38154
4475 [38274]: https://github.com/rust-lang/rust/pull/38274
4476 [38304]: https://github.com/rust-lang/rust/pull/38304
4477 [38313]: https://github.com/rust-lang/rust/pull/38313
4478 [38314]: https://github.com/rust-lang/rust/pull/38314
4479 [38327]: https://github.com/rust-lang/rust/pull/38327
4480 [38401]: https://github.com/rust-lang/rust/pull/38401
4481 [38413]: https://github.com/rust-lang/rust/pull/38413
4482 [38469]: https://github.com/rust-lang/rust/pull/38469
4483 [38559]: https://github.com/rust-lang/rust/pull/38559
4484 [38571]: https://github.com/rust-lang/rust/pull/38571
4485 [38580]: https://github.com/rust-lang/rust/pull/38580
4486 [38589]: https://github.com/rust-lang/rust/pull/38589
4487 [38670]: https://github.com/rust-lang/rust/pull/38670
4488 [38712]: https://github.com/rust-lang/rust/pull/38712
4489 [38726]: https://github.com/rust-lang/rust/pull/38726
4490 [38781]: https://github.com/rust-lang/rust/pull/38781
4491 [38798]: https://github.com/rust-lang/rust/pull/38798
4492 [38909]: https://github.com/rust-lang/rust/pull/38909
4493 [38920]: https://github.com/rust-lang/rust/pull/38920
4494 [38927]: https://github.com/rust-lang/rust/pull/38927
4495 [39048]: https://github.com/rust-lang/rust/pull/39048
4496 [39282]: https://github.com/rust-lang/rust/pull/39282
4497 [39379]: https://github.com/rust-lang/rust/pull/39379
4498 [41105]: https://github.com/rust-lang/rust/issues/41105
4499 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4500 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
4501 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add
4502 [`Duration::checked_div`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_div
4503 [`Duration::checked_mul`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_mul
4504 [`Duration::checked_sub`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_sub
4505 [`File::set_permissions`]: https://doc.rust-lang.org/std/fs/struct.File.html#method.set_permissions
4506 [`IpAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv4
4507 [`IpAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_ipv6
4508 [`Result::unwrap_or_default`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.unwrap_or_default
4509 [`SocketAddr::is_ipv4`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv4
4510 [`SocketAddr::is_ipv6`]: https://doc.rust-lang.org/std/net/enum.SocketAddr.html#method.is_ipv6
4511 [`String::insert_str`]: https://doc.rust-lang.org/std/string/struct.String.html#method.insert_str
4512 [`String::split_off`]: https://doc.rust-lang.org/std/string/struct.String.html#method.split_off
4513 [`Vec::dedup_by_key`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by_key
4514 [`Vec::dedup_by`]: https://doc.rust-lang.org/std/vec/struct.Vec.html#method.dedup_by
4515 [`VecDeque::resize`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.resize
4516 [`VecDeque::truncate`]: https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.truncate
4517 [`str::repeat`]: https://doc.rust-lang.org/std/primitive.str.html#method.repeat
4518 [`str::replacen`]: https://doc.rust-lang.org/std/primitive.str.html#method.replacen
4519 [cargo/3296]: https://github.com/rust-lang/cargo/pull/3296
4520 [cargo/3301]: https://github.com/rust-lang/cargo/pull/3301
4521 [cargo/3443]: https://github.com/rust-lang/cargo/pull/3443
4522 [cargo/3511]: https://github.com/rust-lang/cargo/pull/3511
4523 [cargo/3515]: https://github.com/rust-lang/cargo/pull/3515
4524 [cargo/3534]: https://github.com/rust-lang/cargo/pull/3534
4525 [cargo/3546]: https://github.com/rust-lang/cargo/pull/3546
4526 [cargo/3557]: https://github.com/rust-lang/cargo/pull/3557
4527 [cargo/3604]: https://github.com/rust-lang/cargo/pull/3604
4528 [RFC 1623]: https://github.com/rust-lang/rfcs/blob/master/text/1623-static.md
4531 Version 1.15.1 (2017-02-09)
4532 ===========================
4534 * [Fix IntoIter::as_mut_slice's signature][39466]
4535 * [Compile compiler builtins with `-fPIC` on 32-bit platforms][39523]
4537 [39466]: https://github.com/rust-lang/rust/pull/39466
4538 [39523]: https://github.com/rust-lang/rust/pull/39523
4541 Version 1.15.0 (2017-02-02)
4542 ===========================
4547 * Basic procedural macros allowing custom `#[derive]`, aka "macros 1.1", are
4548 stable. This allows popular code-generating crates like Serde and Diesel to
4549 work ergonomically. [RFC 1681].
4550 * [Tuple structs may be empty. Unary and empty tuple structs may be instantiated
4551 with curly braces][36868]. Part of [RFC 1506].
4552 * [A number of minor changes to name resolution have been activated][37127].
4553 They add up to more consistent semantics, allowing for future evolution of
4554 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4555 details of what is different. The breaking changes here have been transitioned
4556 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4557 * [In `macro_rules`, `path` fragments can now be parsed as type parameter
4559 * [`?Sized` can be used in `where` clauses][37791]
4560 * [There is now a limit on the size of monomorphized types and it can be
4561 modified with the `#![type_size_limit]` crate attribute, similarly to
4562 the `#![recursion_limit]` attribute][37789]
4567 * [On Windows, the compiler will apply dllimport attributes when linking to
4568 extern functions][37973]. Additional attributes and flags can control which
4569 library kind is linked and its name. [RFC 1717].
4570 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4571 * [The `--test` flag works with procedural macro crates][38107]
4572 * [Fix `extern "aapcs" fn` ABI][37814]
4573 * [The `-C no-stack-check` flag is deprecated][37636]. It does nothing.
4574 * [The `format!` expander recognizes incorrect `printf` and shell-style
4575 formatting directives and suggests the correct format][37613].
4576 * [Only report one error for all unused imports in an import list][37456]
4578 Compiler Performance
4579 --------------------
4581 * [Avoid unnecessary `mk_ty` calls in `Ty::super_fold_with`][37705]
4582 * [Avoid more unnecessary `mk_ty` calls in `Ty::super_fold_with`][37979]
4583 * [Don't clone in `UnificationTable::probe`][37848]
4584 * [Remove `scope_auxiliary` to cut RSS by 10%][37764]
4585 * [Use small vectors in type walker][37760]
4586 * [Macro expansion performance was improved][37701]
4587 * [Change `HirVec<P<T>>` to `HirVec<T>` in `hir::Expr`][37642]
4588 * [Replace FNV with a faster hash function][37229]
4593 * [`std::iter::Iterator::min_by`]
4594 * [`std::iter::Iterator::max_by`]
4595 * [`std::os::*::fs::FileExt`]
4596 * [`std::sync::atomic::Atomic*::get_mut`]
4597 * [`std::sync::atomic::Atomic*::into_inner`]
4598 * [`std::vec::IntoIter::as_slice`]
4599 * [`std::vec::IntoIter::as_mut_slice`]
4600 * [`std::sync::mpsc::Receiver::try_iter`]
4601 * [`std::os::unix::process::CommandExt::before_exec`]
4602 * [`std::rc::Rc::strong_count`]
4603 * [`std::rc::Rc::weak_count`]
4604 * [`std::sync::Arc::strong_count`]
4605 * [`std::sync::Arc::weak_count`]
4606 * [`std::char::encode_utf8`]
4607 * [`std::char::encode_utf16`]
4608 * [`std::cell::Ref::clone`]
4609 * [`std::io::Take::into_inner`]
4614 * [The standard sorting algorithm has been rewritten for dramatic performance
4615 improvements][38192]. It is a hybrid merge sort, drawing influences from
4616 Timsort. Previously it was a naive merge sort.
4617 * [`Iterator::nth` no longer has a `Sized` bound][38134]
4618 * [`Extend<&T>` is specialized for `Vec` where `T: Copy`][38182] to improve
4620 * [`chars().count()` is much faster][37888] and so are [`chars().last()`
4621 and `char_indices().last()`][37882]
4622 * [Fix ARM Objective-C ABI in `std::env::args`][38146]
4623 * [Chinese characters display correctly in `fmt::Debug`][37855]
4624 * [Derive `Default` for `Duration`][37699]
4625 * [Support creation of anonymous pipes on WinXP/2k][37677]
4626 * [`mpsc::RecvTimeoutError` implements `Error`][37527]
4627 * [Don't pass overlapped handles to processes][38835]
4632 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4633 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4634 should instead check the variable at runtime with `std::env`. That the value
4635 was set at build time was a bug, and incorrect when cross-compiling. This
4636 change is known to cause breakage.
4637 * [Add `--all` flag to `cargo test`][cargo/3221]
4638 * [Compile statically against the MSVC CRT][cargo/3363]
4639 * [Mix feature flags into fingerprint/metadata shorthash][cargo/3102]
4640 * [Link OpenSSL statically on OSX][cargo/3311]
4641 * [Apply new fingerprinting to build dir outputs][cargo/3310]
4642 * [Test for bad path overrides with summaries][cargo/3336]
4643 * [Require `cargo install --vers` to take a semver version][cargo/3338]
4644 * [Fix retrying crate downloads for network errors][cargo/3348]
4645 * [Implement string lookup for `build.rustflags` config key][cargo/3356]
4646 * [Emit more info on --message-format=json][cargo/3319]
4647 * [Assume `build.rs` in the same directory as `Cargo.toml` is a build script][cargo/3361]
4648 * [Don't ignore errors in workspace manifest][cargo/3409]
4649 * [Fix `--message-format JSON` when rustc emits non-JSON warnings][cargo/3410]
4654 * [Test runners (binaries built with `--test`) now support a `--list` argument
4655 that lists the tests it contains][38185]
4656 * [Test runners now support a `--exact` argument that makes the test filter
4657 match exactly, instead of matching only a substring of the test name][38181]
4658 * [rustdoc supports a `--playground-url` flag][37763]
4659 * [rustdoc provides more details about `#[should_panic]` errors][37749]
4664 * [The Rust build system is now written in Rust][37817]. The Makefiles may
4665 continue to be used in this release by passing `--disable-rustbuild` to the
4666 configure script, but they will be deleted soon. Note that the new build
4667 system uses a different on-disk layout that will likely affect any scripts
4669 * [Rust supports i686-unknown-openbsd][38086]. Tier 3 support. No testing or
4671 * [Rust supports the MSP430][37627]. Tier 3 support. No testing or releases.
4672 * [Rust supports the ARMv5TE architecture][37615]. Tier 3 support. No testing or
4678 * [A number of minor changes to name resolution have been activated][37127].
4679 They add up to more consistent semantics, allowing for future evolution of
4680 Rust macros. Specified in [RFC 1560], see its section on ["changes"] for
4681 details of what is different. The breaking changes here have been transitioned
4682 through the [`legacy_imports`] lint since 1.14, with no known regressions.
4683 * [In this release, Cargo build scripts no longer have access to the `OUT_DIR`
4684 environment variable at build time via `env!("OUT_DIR")`][cargo/3368]. They
4685 should instead check the variable at runtime with `std::env`. That the value
4686 was set at build time was a bug, and incorrect when cross-compiling. This
4687 change is known to cause breakage.
4688 * [Higher-ranked lifetimes are no longer allowed to appear _only_ in associated
4689 types][33685]. The [`hr_lifetime_in_assoc_type` lint] has been a warning since
4690 1.10 and is now an error by default. It will become a hard error in the near
4692 * [The semantics relating modules to file system directories are changing in
4693 minor ways][37602]. This is captured in the new `legacy_directory_ownership`
4694 lint, which is a warning in this release, and will become a hard error in the
4696 * [Rust-ABI symbols are no longer exported from cdylibs][38117]
4697 * [Once `Peekable` peeks a `None` it will return that `None` without re-querying
4698 the underlying iterator][37834]
4700 ["changes"]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md#changes-to-name-resolution-rules
4701 [33685]: https://github.com/rust-lang/rust/issues/33685
4702 [36868]: https://github.com/rust-lang/rust/pull/36868
4703 [37127]: https://github.com/rust-lang/rust/pull/37127
4704 [37229]: https://github.com/rust-lang/rust/pull/37229
4705 [37456]: https://github.com/rust-lang/rust/pull/37456
4706 [37527]: https://github.com/rust-lang/rust/pull/37527
4707 [37602]: https://github.com/rust-lang/rust/pull/37602
4708 [37613]: https://github.com/rust-lang/rust/pull/37613
4709 [37615]: https://github.com/rust-lang/rust/pull/37615
4710 [37636]: https://github.com/rust-lang/rust/pull/37636
4711 [37627]: https://github.com/rust-lang/rust/pull/37627
4712 [37642]: https://github.com/rust-lang/rust/pull/37642
4713 [37677]: https://github.com/rust-lang/rust/pull/37677
4714 [37699]: https://github.com/rust-lang/rust/pull/37699
4715 [37701]: https://github.com/rust-lang/rust/pull/37701
4716 [37705]: https://github.com/rust-lang/rust/pull/37705
4717 [37749]: https://github.com/rust-lang/rust/pull/37749
4718 [37760]: https://github.com/rust-lang/rust/pull/37760
4719 [37763]: https://github.com/rust-lang/rust/pull/37763
4720 [37764]: https://github.com/rust-lang/rust/pull/37764
4721 [37789]: https://github.com/rust-lang/rust/pull/37789
4722 [37791]: https://github.com/rust-lang/rust/pull/37791
4723 [37814]: https://github.com/rust-lang/rust/pull/37814
4724 [37817]: https://github.com/rust-lang/rust/pull/37817
4725 [37834]: https://github.com/rust-lang/rust/pull/37834
4726 [37848]: https://github.com/rust-lang/rust/pull/37848
4727 [37855]: https://github.com/rust-lang/rust/pull/37855
4728 [37882]: https://github.com/rust-lang/rust/pull/37882
4729 [37888]: https://github.com/rust-lang/rust/pull/37888
4730 [37973]: https://github.com/rust-lang/rust/pull/37973
4731 [37979]: https://github.com/rust-lang/rust/pull/37979
4732 [38086]: https://github.com/rust-lang/rust/pull/38086
4733 [38107]: https://github.com/rust-lang/rust/pull/38107
4734 [38117]: https://github.com/rust-lang/rust/pull/38117
4735 [38134]: https://github.com/rust-lang/rust/pull/38134
4736 [38146]: https://github.com/rust-lang/rust/pull/38146
4737 [38181]: https://github.com/rust-lang/rust/pull/38181
4738 [38182]: https://github.com/rust-lang/rust/pull/38182
4739 [38185]: https://github.com/rust-lang/rust/pull/38185
4740 [38192]: https://github.com/rust-lang/rust/pull/38192
4741 [38279]: https://github.com/rust-lang/rust/pull/38279
4742 [38835]: https://github.com/rust-lang/rust/pull/38835
4743 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4744 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
4745 [RFC 1560]: https://github.com/rust-lang/rfcs/blob/master/text/1560-name-resolution.md
4746 [RFC 1681]: https://github.com/rust-lang/rfcs/blob/master/text/1681-macros-1.1.md
4747 [RFC 1717]: https://github.com/rust-lang/rfcs/blob/master/text/1717-dllimport.md
4748 [`hr_lifetime_in_assoc_type` lint]: https://github.com/rust-lang/rust/issues/33685
4749 [`legacy_imports`]: https://github.com/rust-lang/rust/pull/38271
4750 [cargo/3102]: https://github.com/rust-lang/cargo/pull/3102
4751 [cargo/3221]: https://github.com/rust-lang/cargo/pull/3221
4752 [cargo/3310]: https://github.com/rust-lang/cargo/pull/3310
4753 [cargo/3311]: https://github.com/rust-lang/cargo/pull/3311
4754 [cargo/3319]: https://github.com/rust-lang/cargo/pull/3319
4755 [cargo/3336]: https://github.com/rust-lang/cargo/pull/3336
4756 [cargo/3338]: https://github.com/rust-lang/cargo/pull/3338
4757 [cargo/3348]: https://github.com/rust-lang/cargo/pull/3348
4758 [cargo/3356]: https://github.com/rust-lang/cargo/pull/3356
4759 [cargo/3361]: https://github.com/rust-lang/cargo/pull/3361
4760 [cargo/3363]: https://github.com/rust-lang/cargo/pull/3363
4761 [cargo/3368]: https://github.com/rust-lang/cargo/issues/3368
4762 [cargo/3409]: https://github.com/rust-lang/cargo/pull/3409
4763 [cargo/3410]: https://github.com/rust-lang/cargo/pull/3410
4764 [`std::iter::Iterator::min_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.min_by
4765 [`std::iter::Iterator::max_by`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.max_by
4766 [`std::os::*::fs::FileExt`]: https://doc.rust-lang.org/std/os/unix/fs/trait.FileExt.html
4767 [`std::sync::atomic::Atomic*::get_mut`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.get_mut
4768 [`std::sync::atomic::Atomic*::into_inner`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicU8.html#method.into_inner
4769 [`std::vec::IntoIter::as_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_slice
4770 [`std::vec::IntoIter::as_mut_slice`]: https://doc.rust-lang.org/std/vec/struct.IntoIter.html#method.as_mut_slice
4771 [`std::sync::mpsc::Receiver::try_iter`]: https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.try_iter
4772 [`std::os::unix::process::CommandExt::before_exec`]: https://doc.rust-lang.org/std/os/unix/process/trait.CommandExt.html#tymethod.before_exec
4773 [`std::rc::Rc::strong_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.strong_count
4774 [`std::rc::Rc::weak_count`]: https://doc.rust-lang.org/std/rc/struct.Rc.html#method.weak_count
4775 [`std::sync::Arc::strong_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.strong_count
4776 [`std::sync::Arc::weak_count`]: https://doc.rust-lang.org/std/sync/struct.Arc.html#method.weak_count
4777 [`std::char::encode_utf8`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf8
4778 [`std::char::encode_utf16`]: https://doc.rust-lang.org/std/primitive.char.html#method.encode_utf16
4779 [`std::cell::Ref::clone`]: https://doc.rust-lang.org/std/cell/struct.Ref.html#method.clone
4780 [`std::io::Take::into_inner`]: https://doc.rust-lang.org/std/io/struct.Take.html#method.into_inner
4783 Version 1.14.0 (2016-12-22)
4784 ===========================
4789 * [`..` matches multiple tuple fields in enum variants, structs
4790 and tuples][36843]. [RFC 1492].
4791 * [Safe `fn` items can be coerced to `unsafe fn` pointers][37389]
4792 * [`use *` and `use ::*` both glob-import from the crate root][37367]
4793 * [It's now possible to call a `Vec<Box<Fn()>>` without explicit
4794 dereferencing][36822]
4799 * [Mark enums with non-zero discriminant as non-zero][37224]
4800 * [Lower-case `static mut` names are linted like other
4801 statics and consts][37162]
4802 * [Fix ICE on some macros in const integer positions
4803 (e.g. `[u8; m!()]`)][36819]
4804 * [Improve error message and snippet for "did you mean `x`"][36798]
4805 * [Add a panic-strategy field to the target specification][36794]
4806 * [Include LLVM version in `--version --verbose`][37200]
4808 Compile-time Optimizations
4809 --------------------------
4811 * [Improve macro expansion performance][37569]
4812 * [Shrink `Expr_::ExprInlineAsm`][37445]
4813 * [Replace all uses of SHA-256 with BLAKE2b][37439]
4814 * [Reduce the number of bytes hashed by `IchHasher`][37427]
4815 * [Avoid more allocations when compiling html5ever][37373]
4816 * [Use `SmallVector` in `CombineFields::instantiate`][37322]
4817 * [Avoid some allocations in the macro parser][37318]
4818 * [Use a faster deflate setting][37298]
4819 * [Add `ArrayVec` and `AccumulateVec` to reduce heap allocations
4820 during interning of slices][37270]
4821 * [Optimize `write_metadata`][37267]
4822 * [Don't process obligation forest cycles when stalled][37231]
4823 * [Avoid many `CrateConfig` clones][37161]
4824 * [Optimize `Substs::super_fold_with`][37108]
4825 * [Optimize `ObligationForest`'s `NodeState` handling][36993]
4826 * [Speed up `plug_leaks`][36917]
4831 * [`println!()`, with no arguments, prints newline][36825].
4832 Previously, an empty string was required to achieve the same.
4833 * [`Wrapping` impls standard binary and unary operators, as well as
4834 the `Sum` and `Product` iterators][37356]
4835 * [Implement `From<Cow<str>> for String` and `From<Cow<[T]>> for
4837 * [Improve `fold` performance for `chain`, `cloned`, `map`, and
4838 `VecDeque` iterators][37315]
4839 * [Improve `SipHasher` performance on small values][37312]
4840 * [Add Iterator trait TrustedLen to enable better FromIterator /
4842 * [Expand `.zip()` specialization to `.map()` and `.cloned()`][37230]
4843 * [`ReadDir` implements `Debug`][37221]
4844 * [Implement `RefUnwindSafe` for atomic types][37178]
4845 * [Specialize `Vec::extend` to `Vec::extend_from_slice`][37094]
4846 * [Avoid allocations in `Decoder::read_str`][37064]
4847 * [`io::Error` implements `From<io::ErrorKind>`][37037]
4848 * [Impl `Debug` for raw pointers to unsized data][36880]
4849 * [Don't reuse `HashMap` random seeds][37470]
4850 * [The internal memory layout of `HashMap` is more cache-friendly, for
4851 significant improvements in some operations][36692]
4852 * [`HashMap` uses less memory on 32-bit architectures][36595]
4853 * [Impl `Add<{str, Cow<str>}>` for `Cow<str>`][36430]
4858 * [Expose rustc cfg values to build scripts][cargo/3243]
4859 * [Allow cargo to work with read-only `CARGO_HOME`][cargo/3259]
4860 * [Fix passing --features when testing multiple packages][cargo/3280]
4861 * [Use a single profile set per workspace][cargo/3249]
4862 * [Load `replace` sections from lock files][cargo/3220]
4863 * [Ignore `panic` configuration for test/bench profiles][cargo/3175]
4868 * [rustup is the recommended Rust installation method][1.14rustup]
4869 * This release includes host (rustc) builds for Linux on MIPS, PowerPC, and
4870 S390x. These are [tier 2] platforms and may have major defects. Follow the
4871 instructions on the website to install, or add the targets to an existing
4872 installation with `rustup target add`. The new target triples are:
4873 - `mips-unknown-linux-gnu`
4874 - `mipsel-unknown-linux-gnu`
4875 - `mips64-unknown-linux-gnuabi64`
4876 - `mips64el-unknown-linux-gnuabi64 `
4877 - `powerpc-unknown-linux-gnu`
4878 - `powerpc64-unknown-linux-gnu`
4879 - `powerpc64le-unknown-linux-gnu`
4880 - `s390x-unknown-linux-gnu `
4881 * This release includes target (std) builds for ARM Linux running MUSL
4882 libc. These are [tier 2] platforms and may have major defects. Add the
4883 following triples to an existing rustup installation with `rustup target add`:
4884 - `arm-unknown-linux-musleabi`
4885 - `arm-unknown-linux-musleabihf`
4886 - `armv7-unknown-linux-musleabihf`
4887 * This release includes [experimental support for WebAssembly][1.14wasm], via
4888 the `wasm32-unknown-emscripten` target. This target is known to have major
4889 defects. Please test, report, and fix.
4890 * rustup no longer installs documentation by default. Run `rustup
4891 component add rust-docs` to install.
4892 * [Fix line stepping in debugger][37310]
4893 * [Enable line number debuginfo in releases][37280]
4898 * [Disable jemalloc on aarch64/powerpc/mips][37392]
4899 * [Add support for Fuchsia OS][37313]
4900 * [Detect local-rebuild by only MAJOR.MINOR version][37273]
4905 * [A number of forward-compatibility lints used by the compiler
4906 to gradually introduce language changes have been converted
4907 to deny by default][36894]:
4908 - ["use of inaccessible extern crate erroneously allowed"][36886]
4909 - ["type parameter default erroneously allowed in invalid location"][36887]
4910 - ["detects super or self keywords at the beginning of global path"][36888]
4911 - ["two overlapping inherent impls define an item with the same name
4912 were erroneously allowed"][36889]
4913 - ["floating-point constants cannot be used in patterns"][36890]
4914 - ["constants of struct or enum type can only be used in a pattern if
4915 the struct or enum has `#[derive(PartialEq, Eq)]`"][36891]
4916 - ["lifetimes or labels named `'_` were erroneously allowed"][36892]
4917 * [Prohibit patterns in trait methods without bodies][37378]
4918 * [The atomic `Ordering` enum may not be matched exhaustively][37351]
4919 * [Future-proofing `#[no_link]` breaks some obscure cases][37247]
4920 * [The `$crate` macro variable is accepted in fewer locations][37213]
4921 * [Impls specifying extra region requirements beyond the trait
4922 they implement are rejected][37167]
4923 * [Enums may not be unsized][37111]. Unsized enums are intended to
4924 work but never have. For now they are forbidden.
4925 * [Enforce the shadowing restrictions from RFC 1560 for today's macros][36767]
4927 [tier 2]: https://forge.rust-lang.org/platform-support.html
4928 [1.14rustup]: https://internals.rust-lang.org/t/beta-testing-rustup-rs/3316/204
4929 [1.14wasm]: https://users.rust-lang.org/t/compiling-to-the-web-with-rust-and-emscripten/7627
4930 [36430]: https://github.com/rust-lang/rust/pull/36430
4931 [36595]: https://github.com/rust-lang/rust/pull/36595
4932 [36595]: https://github.com/rust-lang/rust/pull/36595
4933 [36692]: https://github.com/rust-lang/rust/pull/36692
4934 [36767]: https://github.com/rust-lang/rust/pull/36767
4935 [36794]: https://github.com/rust-lang/rust/pull/36794
4936 [36798]: https://github.com/rust-lang/rust/pull/36798
4937 [36819]: https://github.com/rust-lang/rust/pull/36819
4938 [36822]: https://github.com/rust-lang/rust/pull/36822
4939 [36825]: https://github.com/rust-lang/rust/pull/36825
4940 [36843]: https://github.com/rust-lang/rust/pull/36843
4941 [36880]: https://github.com/rust-lang/rust/pull/36880
4942 [36886]: https://github.com/rust-lang/rust/issues/36886
4943 [36887]: https://github.com/rust-lang/rust/issues/36887
4944 [36888]: https://github.com/rust-lang/rust/issues/36888
4945 [36889]: https://github.com/rust-lang/rust/issues/36889
4946 [36890]: https://github.com/rust-lang/rust/issues/36890
4947 [36891]: https://github.com/rust-lang/rust/issues/36891
4948 [36892]: https://github.com/rust-lang/rust/issues/36892
4949 [36894]: https://github.com/rust-lang/rust/pull/36894
4950 [36917]: https://github.com/rust-lang/rust/pull/36917
4951 [36993]: https://github.com/rust-lang/rust/pull/36993
4952 [37037]: https://github.com/rust-lang/rust/pull/37037
4953 [37064]: https://github.com/rust-lang/rust/pull/37064
4954 [37094]: https://github.com/rust-lang/rust/pull/37094
4955 [37108]: https://github.com/rust-lang/rust/pull/37108
4956 [37111]: https://github.com/rust-lang/rust/pull/37111
4957 [37161]: https://github.com/rust-lang/rust/pull/37161
4958 [37162]: https://github.com/rust-lang/rust/pull/37162
4959 [37167]: https://github.com/rust-lang/rust/pull/37167
4960 [37178]: https://github.com/rust-lang/rust/pull/37178
4961 [37200]: https://github.com/rust-lang/rust/pull/37200
4962 [37213]: https://github.com/rust-lang/rust/pull/37213
4963 [37221]: https://github.com/rust-lang/rust/pull/37221
4964 [37224]: https://github.com/rust-lang/rust/pull/37224
4965 [37230]: https://github.com/rust-lang/rust/pull/37230
4966 [37231]: https://github.com/rust-lang/rust/pull/37231
4967 [37247]: https://github.com/rust-lang/rust/pull/37247
4968 [37267]: https://github.com/rust-lang/rust/pull/37267
4969 [37270]: https://github.com/rust-lang/rust/pull/37270
4970 [37273]: https://github.com/rust-lang/rust/pull/37273
4971 [37280]: https://github.com/rust-lang/rust/pull/37280
4972 [37298]: https://github.com/rust-lang/rust/pull/37298
4973 [37306]: https://github.com/rust-lang/rust/pull/37306
4974 [37310]: https://github.com/rust-lang/rust/pull/37310
4975 [37312]: https://github.com/rust-lang/rust/pull/37312
4976 [37313]: https://github.com/rust-lang/rust/pull/37313
4977 [37315]: https://github.com/rust-lang/rust/pull/37315
4978 [37318]: https://github.com/rust-lang/rust/pull/37318
4979 [37322]: https://github.com/rust-lang/rust/pull/37322
4980 [37326]: https://github.com/rust-lang/rust/pull/37326
4981 [37351]: https://github.com/rust-lang/rust/pull/37351
4982 [37356]: https://github.com/rust-lang/rust/pull/37356
4983 [37367]: https://github.com/rust-lang/rust/pull/37367
4984 [37373]: https://github.com/rust-lang/rust/pull/37373
4985 [37378]: https://github.com/rust-lang/rust/pull/37378
4986 [37389]: https://github.com/rust-lang/rust/pull/37389
4987 [37392]: https://github.com/rust-lang/rust/pull/37392
4988 [37427]: https://github.com/rust-lang/rust/pull/37427
4989 [37439]: https://github.com/rust-lang/rust/pull/37439
4990 [37445]: https://github.com/rust-lang/rust/pull/37445
4991 [37470]: https://github.com/rust-lang/rust/pull/37470
4992 [37569]: https://github.com/rust-lang/rust/pull/37569
4993 [RFC 1492]: https://github.com/rust-lang/rfcs/blob/master/text/1492-dotdot-in-patterns.md
4994 [cargo/3175]: https://github.com/rust-lang/cargo/pull/3175
4995 [cargo/3220]: https://github.com/rust-lang/cargo/pull/3220
4996 [cargo/3243]: https://github.com/rust-lang/cargo/pull/3243
4997 [cargo/3249]: https://github.com/rust-lang/cargo/pull/3249
4998 [cargo/3259]: https://github.com/rust-lang/cargo/pull/3259
4999 [cargo/3280]: https://github.com/rust-lang/cargo/pull/3280
5002 Version 1.13.0 (2016-11-10)
5003 ===========================
5008 * [Stabilize the `?` operator][36995]. `?` is a simple way to propagate
5009 errors, like the `try!` macro, described in [RFC 0243].
5010 * [Stabilize macros in type position][36014]. Described in [RFC 873].
5011 * [Stabilize attributes on statements][36995]. Described in [RFC 0016].
5012 * [Fix `#[derive]` for empty tuple structs/variants][35728]
5013 * [Fix lifetime rules for 'if' conditions][36029]
5014 * [Avoid loading and parsing unconfigured non-inline modules][36482]
5019 * [Add the `-C link-arg` argument][36574]
5020 * [Remove the old AST-based backend from rustc_trans][35764]
5021 * [Don't enable NEON by default on armv7 Linux][35814]
5022 * [Fix debug line number info for macro expansions][35238]
5023 * [Do not emit "class method" debuginfo for types that are not
5024 DICompositeType][36008]
5025 * [Warn about multiple conflicting #[repr] hints][34623]
5026 * [When sizing DST, don't double-count nested struct prefixes][36351]
5027 * [Default RUST_MIN_STACK to 16MiB for now][36505]
5028 * [Improve rlib metadata format][36551]. Reduces rlib size significantly.
5029 * [Reject macros with empty repetitions to avoid infinite loop][36721]
5030 * [Expand macros without recursing to avoid stack overflows][36214]
5035 * [Replace macro backtraces with labeled local uses][35702]
5036 * [Improve error message for misplaced doc comments][33922]
5037 * [Buffer unix and lock windows to prevent message interleaving][35975]
5038 * [Update lifetime errors to specifically note temporaries][36171]
5039 * [Special case a few colors for Windows][36178]
5040 * [Suggest `use self` when such an import resolves][36289]
5041 * [Be more specific when type parameter shadows primitive type][36338]
5042 * Many minor improvements
5044 Compile-time Optimizations
5045 --------------------------
5047 * [Compute and cache HIR hashes at beginning][35854]
5048 * [Don't hash types in loan paths][36004]
5049 * [Cache projections in trans][35761]
5050 * [Optimize the parser's last token handling][36527]
5051 * [Only instantiate #[inline] functions in codegen units referencing
5052 them][36524]. This leads to big improvements in cases where crates export
5053 define many inline functions without using them directly.
5054 * [Lazily allocate TypedArena's first chunk][36592]
5055 * [Don't allocate during default HashSet creation][36734]
5062 * [`overflowing_abs`]
5063 * [`RefCell::try_borrow`]
5064 * [`RefCell::try_borrow_mut`]
5069 * [Add `assert_ne!` and `debug_assert_ne!`][35074]
5070 * [Make `vec_deque::Drain`, `hash_map::Drain`, and `hash_set::Drain`
5072 * [Implement `AsRef<[T]>` for `std::slice::Iter`][35559]
5073 * [Implement `Debug` for `std::vec::IntoIter`][35707]
5074 * [`CString`: avoid excessive growth just to 0-terminate][35871]
5075 * [Implement `CoerceUnsized` for `{Cell, RefCell, UnsafeCell}`][35627]
5076 * [Use arc4rand on FreeBSD][35884]
5077 * [memrchr: Correct aligned offset computation][35969]
5078 * [Improve Demangling of Rust Symbols][36059]
5079 * [Use monotonic time in condition variables][35048]
5080 * [Implement `Debug` for `std::path::{Components,Iter}`][36101]
5081 * [Implement conversion traits for `char`][35755]
5082 * [Fix illegal instruction caused by overflow in channel cloning][36104]
5083 * [Zero first byte of CString on drop][36264]
5084 * [Inherit overflow checks for sum and product][36372]
5085 * [Add missing Eq implementations][36423]
5086 * [Implement `Debug` for `DirEntry`][36631]
5087 * [When `getaddrinfo` returns `EAI_SYSTEM` retrieve actual error from
5089 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5090 * [Implement more traits for `std::io::ErrorKind`][35911]
5091 * [Optimize BinaryHeap bounds checking][36072]
5092 * [Work around pointer aliasing issue in `Vec::extend_from_slice`,
5093 `extend_with_element`][36355]
5094 * [Fix overflow checking in unsigned pow()][34942]
5099 * This release includes security fixes to both curl and OpenSSL.
5100 * [Fix transitive doctests when panic=abort][cargo/3021]
5101 * [Add --all-features flag to cargo][cargo/3038]
5102 * [Reject path-based dependencies in `cargo package`][cargo/3060]
5103 * [Don't parse the home directory more than once][cargo/3078]
5104 * [Don't try to generate Cargo.lock on empty workspaces][cargo/3092]
5105 * [Update OpenSSL to 1.0.2j][cargo/3121]
5106 * [Add license and license_file to cargo metadata output][cargo/3110]
5107 * [Make crates-io registry URL optional in config; ignore all changes to
5108 source.crates-io][cargo/3089]
5109 * [Don't download dependencies from other platforms][cargo/3123]
5110 * [Build transitive dev-dependencies when needed][cargo/3125]
5111 * [Add support for per-target rustflags in .cargo/config][cargo/3157]
5112 * [Avoid updating registry when adding existing deps][cargo/3144]
5113 * [Warn about path overrides that won't work][cargo/3136]
5114 * [Use workspaces during `cargo install`][cargo/3146]
5115 * [Leak mspdbsrv.exe processes on Windows][cargo/3162]
5116 * [Add --message-format flag][cargo/3000]
5117 * [Pass target environment for rustdoc][cargo/3205]
5118 * [Use `CommandExt::exec` for `cargo run` on Unix][cargo/2818]
5119 * [Update curl and curl-sys][cargo/3241]
5120 * [Call rustdoc test with the correct cfg flags of a package][cargo/3242]
5125 * [rustdoc: Add the `--sysroot` argument][36586]
5126 * [rustdoc: Fix a couple of issues with the search results][35655]
5127 * [rustdoc: remove the `!` from macro URLs and titles][35234]
5128 * [gdb: Fix pretty-printing special-cased Rust types][35585]
5129 * [rustdoc: Filter more incorrect methods inherited through Deref][36266]
5134 * [Remove unmaintained style guide][35124]
5135 * [Add s390x support][36369]
5136 * [Initial work at Haiku OS support][36727]
5137 * [Add mips-uclibc targets][35734]
5138 * [Crate-ify compiler-rt into compiler-builtins][35021]
5139 * [Add rustc version info (git hash + date) to dist tarball][36213]
5140 * Many documentation improvements
5145 * [`SipHasher`] is deprecated. Use [`DefaultHasher`].
5146 * [Deny (by default) transmuting from fn item types to pointer-sized
5147 types][34923]. Continuing the long transition to zero-sized fn items,
5149 * [Fix `#[derive]` for empty tuple structs/variants][35728].
5151 * [Issue deprecation warnings for safe accesses to extern statics][36173]
5152 * [Fix lifetime rules for 'if' conditions][36029].
5153 * [Inherit overflow checks for sum and product][36372].
5154 * [Forbid user-defined macros named "macro_rules"][36730].
5156 [33922]: https://github.com/rust-lang/rust/pull/33922
5157 [34623]: https://github.com/rust-lang/rust/pull/34623
5158 [34923]: https://github.com/rust-lang/rust/pull/34923
5159 [34942]: https://github.com/rust-lang/rust/pull/34942
5160 [34982]: https://github.com/rust-lang/rust/pull/34982
5161 [35021]: https://github.com/rust-lang/rust/pull/35021
5162 [35048]: https://github.com/rust-lang/rust/pull/35048
5163 [35074]: https://github.com/rust-lang/rust/pull/35074
5164 [35124]: https://github.com/rust-lang/rust/pull/35124
5165 [35234]: https://github.com/rust-lang/rust/pull/35234
5166 [35238]: https://github.com/rust-lang/rust/pull/35238
5167 [35354]: https://github.com/rust-lang/rust/pull/35354
5168 [35559]: https://github.com/rust-lang/rust/pull/35559
5169 [35585]: https://github.com/rust-lang/rust/pull/35585
5170 [35627]: https://github.com/rust-lang/rust/pull/35627
5171 [35655]: https://github.com/rust-lang/rust/pull/35655
5172 [35702]: https://github.com/rust-lang/rust/pull/35702
5173 [35707]: https://github.com/rust-lang/rust/pull/35707
5174 [35728]: https://github.com/rust-lang/rust/pull/35728
5175 [35734]: https://github.com/rust-lang/rust/pull/35734
5176 [35755]: https://github.com/rust-lang/rust/pull/35755
5177 [35761]: https://github.com/rust-lang/rust/pull/35761
5178 [35764]: https://github.com/rust-lang/rust/pull/35764
5179 [35814]: https://github.com/rust-lang/rust/pull/35814
5180 [35854]: https://github.com/rust-lang/rust/pull/35854
5181 [35871]: https://github.com/rust-lang/rust/pull/35871
5182 [35884]: https://github.com/rust-lang/rust/pull/35884
5183 [35911]: https://github.com/rust-lang/rust/pull/35911
5184 [35969]: https://github.com/rust-lang/rust/pull/35969
5185 [35975]: https://github.com/rust-lang/rust/pull/35975
5186 [36004]: https://github.com/rust-lang/rust/pull/36004
5187 [36008]: https://github.com/rust-lang/rust/pull/36008
5188 [36014]: https://github.com/rust-lang/rust/pull/36014
5189 [36029]: https://github.com/rust-lang/rust/pull/36029
5190 [36059]: https://github.com/rust-lang/rust/pull/36059
5191 [36072]: https://github.com/rust-lang/rust/pull/36072
5192 [36101]: https://github.com/rust-lang/rust/pull/36101
5193 [36104]: https://github.com/rust-lang/rust/pull/36104
5194 [36171]: https://github.com/rust-lang/rust/pull/36171
5195 [36173]: https://github.com/rust-lang/rust/pull/36173
5196 [36178]: https://github.com/rust-lang/rust/pull/36178
5197 [36213]: https://github.com/rust-lang/rust/pull/36213
5198 [36214]: https://github.com/rust-lang/rust/pull/36214
5199 [36264]: https://github.com/rust-lang/rust/pull/36264
5200 [36266]: https://github.com/rust-lang/rust/pull/36266
5201 [36289]: https://github.com/rust-lang/rust/pull/36289
5202 [36338]: https://github.com/rust-lang/rust/pull/36338
5203 [36351]: https://github.com/rust-lang/rust/pull/36351
5204 [36355]: https://github.com/rust-lang/rust/pull/36355
5205 [36369]: https://github.com/rust-lang/rust/pull/36369
5206 [36372]: https://github.com/rust-lang/rust/pull/36372
5207 [36423]: https://github.com/rust-lang/rust/pull/36423
5208 [36482]: https://github.com/rust-lang/rust/pull/36482
5209 [36505]: https://github.com/rust-lang/rust/pull/36505
5210 [36524]: https://github.com/rust-lang/rust/pull/36524
5211 [36527]: https://github.com/rust-lang/rust/pull/36527
5212 [36551]: https://github.com/rust-lang/rust/pull/36551
5213 [36574]: https://github.com/rust-lang/rust/pull/36574
5214 [36586]: https://github.com/rust-lang/rust/pull/36586
5215 [36592]: https://github.com/rust-lang/rust/pull/36592
5216 [36631]: https://github.com/rust-lang/rust/pull/36631
5217 [36639]: https://github.com/rust-lang/rust/pull/36639
5218 [36721]: https://github.com/rust-lang/rust/pull/36721
5219 [36727]: https://github.com/rust-lang/rust/pull/36727
5220 [36730]: https://github.com/rust-lang/rust/pull/36730
5221 [36734]: https://github.com/rust-lang/rust/pull/36734
5222 [36754]: https://github.com/rust-lang/rust/pull/36754
5223 [36995]: https://github.com/rust-lang/rust/pull/36995
5224 [RFC 0016]: https://github.com/rust-lang/rfcs/blob/master/text/0016-more-attributes.md
5225 [RFC 0243]: https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md
5226 [RFC 1506]: https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md
5227 [RFC 401]: https://github.com/rust-lang/rfcs/blob/master/text/0401-coercions.md
5228 [RFC 873]: https://github.com/rust-lang/rfcs/blob/master/text/0873-type-macros.md
5229 [cargo/2818]: https://github.com/rust-lang/cargo/pull/2818
5230 [cargo/3000]: https://github.com/rust-lang/cargo/pull/3000
5231 [cargo/3021]: https://github.com/rust-lang/cargo/pull/3021
5232 [cargo/3038]: https://github.com/rust-lang/cargo/pull/3038
5233 [cargo/3060]: https://github.com/rust-lang/cargo/pull/3060
5234 [cargo/3078]: https://github.com/rust-lang/cargo/pull/3078
5235 [cargo/3089]: https://github.com/rust-lang/cargo/pull/3089
5236 [cargo/3092]: https://github.com/rust-lang/cargo/pull/3092
5237 [cargo/3110]: https://github.com/rust-lang/cargo/pull/3110
5238 [cargo/3121]: https://github.com/rust-lang/cargo/pull/3121
5239 [cargo/3123]: https://github.com/rust-lang/cargo/pull/3123
5240 [cargo/3125]: https://github.com/rust-lang/cargo/pull/3125
5241 [cargo/3136]: https://github.com/rust-lang/cargo/pull/3136
5242 [cargo/3144]: https://github.com/rust-lang/cargo/pull/3144
5243 [cargo/3146]: https://github.com/rust-lang/cargo/pull/3146
5244 [cargo/3157]: https://github.com/rust-lang/cargo/pull/3157
5245 [cargo/3162]: https://github.com/rust-lang/cargo/pull/3162
5246 [cargo/3205]: https://github.com/rust-lang/cargo/pull/3205
5247 [cargo/3241]: https://github.com/rust-lang/cargo/pull/3241
5248 [cargo/3242]: https://github.com/rust-lang/cargo/pull/3242
5249 [rustup]: https://www.rustup.rs
5250 [`checked_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.checked_abs
5251 [`wrapping_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.wrapping_abs
5252 [`overflowing_abs`]: https://doc.rust-lang.org/std/primitive.i32.html#method.overflowing_abs
5253 [`RefCell::try_borrow`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow
5254 [`RefCell::try_borrow_mut`]: https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.try_borrow_mut
5255 [`SipHasher`]: https://doc.rust-lang.org/std/hash/struct.SipHasher.html
5256 [`DefaultHasher`]: https://doc.rust-lang.org/std/collections/hash_map/struct.DefaultHasher.html
5259 Version 1.12.1 (2016-10-20)
5260 ===========================
5265 * [ICE: 'rustc' panicked at 'assertion failed: concrete_substs.is_normalized_for_trans()' #36381][36381]
5266 * [Confusion with double negation and booleans][36856]
5267 * [rustc 1.12.0 fails with SIGSEGV in release mode (syn crate 0.8.0)][36875]
5268 * [Rustc 1.12.0 Windows build of `ethcore` crate fails with LLVM error][36924]
5269 * [1.12.0: High memory usage when linking in release mode with debug info][36926]
5270 * [Corrupted memory after updated to 1.12][36936]
5271 * ["Let NullaryConstructor = something;" causes internal compiler error: "tried to overwrite interned AdtDef"][37026]
5272 * [Fix ICE: inject bitcast if types mismatch for invokes/calls/stores][37112]
5273 * [debuginfo: Handle spread_arg case in MIR-trans in a more stable way.][37153]
5275 [36381]: https://github.com/rust-lang/rust/issues/36381
5276 [36856]: https://github.com/rust-lang/rust/issues/36856
5277 [36875]: https://github.com/rust-lang/rust/issues/36875
5278 [36924]: https://github.com/rust-lang/rust/issues/36924
5279 [36926]: https://github.com/rust-lang/rust/issues/36926
5280 [36936]: https://github.com/rust-lang/rust/issues/36936
5281 [37026]: https://github.com/rust-lang/rust/issues/37026
5282 [37112]: https://github.com/rust-lang/rust/issues/37112
5283 [37153]: https://github.com/rust-lang/rust/issues/37153
5286 Version 1.12.0 (2016-09-29)
5287 ===========================
5292 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5293 This translation pass is far simpler than the previous AST->LLVM pass, and
5294 creates opportunities to perform new optimizations directly on the MIR. It
5295 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5296 * [`rustc` presents a new, more readable error format, along with
5297 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5298 Most common editors supporting Rust have been updated to work with it. It was
5299 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5304 * [`rustc` translates code to LLVM IR via its own "middle" IR (MIR)](https://github.com/rust-lang/rust/pull/34096).
5305 This translation pass is far simpler than the previous AST->LLVM pass, and
5306 creates opportunities to perform new optimizations directly on the MIR. It
5307 was previously described [on the Rust blog](https://blog.rust-lang.org/2016/04/19/MIR.html).
5308 * [Print the Rust target name, not the LLVM target name, with
5309 `--print target-list`](https://github.com/rust-lang/rust/pull/35489)
5310 * [The computation of `TypeId` is correct in some cases where it was previously
5311 producing inconsistent results](https://github.com/rust-lang/rust/pull/35267)
5312 * [The `mips-unknown-linux-gnu` target uses hardware floating point by default](https://github.com/rust-lang/rust/pull/34910)
5313 * [The `rustc` arguments, `--print target-cpus`, `--print target-features`,
5314 `--print relocation-models`, and `--print code-models` print the available
5315 options to the `-C target-cpu`, `-C target-feature`, `-C relocation-model` and
5316 `-C code-model` code generation arguments](https://github.com/rust-lang/rust/pull/34845)
5317 * [`rustc` supports three new MUSL targets on ARM: `arm-unknown-linux-musleabi`,
5318 `arm-unknown-linux-musleabihf`, and `armv7-unknown-linux-musleabihf`](https://github.com/rust-lang/rust/pull/35060).
5319 These targets produce statically-linked binaries. There are no binary release
5325 * [`rustc` presents a new, more readable error format, along with
5326 machine-readable JSON error output for use by IDEs](https://github.com/rust-lang/rust/pull/35401).
5327 Most common editors supporting Rust have been updated to work with it. It was
5328 previously described [on the Rust blog](https://blog.rust-lang.org/2016/08/10/Shape-of-errors-to-come.html).
5329 * [In error descriptions, references are now described in plain English,
5330 instead of as "&-ptr"](https://github.com/rust-lang/rust/pull/35611)
5331 * [In error type descriptions, unknown numeric types are named `{integer}` or
5332 `{float}` instead of `_`](https://github.com/rust-lang/rust/pull/35080)
5333 * [`rustc` emits a clearer error when inner attributes follow a doc comment](https://github.com/rust-lang/rust/pull/34676)
5338 * [`macro_rules!` invocations can be made within `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34925)
5339 * [`macro_rules!` meta-variables are hygienic](https://github.com/rust-lang/rust/pull/35453)
5340 * [`macro_rules!` `tt` matchers can be reparsed correctly, making them much more
5341 useful](https://github.com/rust-lang/rust/pull/34908)
5342 * [`macro_rules!` `stmt` matchers correctly consume the entire contents when
5343 inside non-braces invocations](https://github.com/rust-lang/rust/pull/34886)
5344 * [Semicolons are properly required as statement delimiters inside
5345 `macro_rules!` invocations](https://github.com/rust-lang/rust/pull/34660)
5346 * [`cfg_attr` works on `path` attributes](https://github.com/rust-lang/rust/pull/34546)
5351 * [`Cell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.as_ptr)
5352 * [`RefCell::as_ptr`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.as_ptr)
5353 * [`IpAddr::is_unspecified`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_unspecified)
5354 * [`IpAddr::is_loopback`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_loopback)
5355 * [`IpAddr::is_multicast`](https://doc.rust-lang.org/std/net/enum.IpAddr.html#method.is_multicast)
5356 * [`Ipv4Addr::is_unspecified`](https://doc.rust-lang.org/std/net/struct.Ipv4Addr.html#method.is_unspecified)
5357 * [`Ipv6Addr::octets`](https://doc.rust-lang.org/std/net/struct.Ipv6Addr.html#method.octets)
5358 * [`LinkedList::contains`](https://doc.rust-lang.org/std/collections/linked_list/struct.LinkedList.html#method.contains)
5359 * [`VecDeque::contains`](https://doc.rust-lang.org/std/collections/vec_deque/struct.VecDeque.html#method.contains)
5360 * [`ExitStatusExt::from_raw`](https://doc.rust-lang.org/std/os/unix/process/trait.ExitStatusExt.html#tymethod.from_raw).
5361 Both on Unix and Windows.
5362 * [`Receiver::recv_timeout`](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html#method.recv_timeout)
5363 * [`RecvTimeoutError`](https://doc.rust-lang.org/std/sync/mpsc/enum.RecvTimeoutError.html)
5364 * [`BinaryHeap::peek_mut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.peek_mut)
5365 * [`PeekMut`](https://doc.rust-lang.org/std/collections/binary_heap/struct.PeekMut.html)
5366 * [`iter::Product`](https://doc.rust-lang.org/std/iter/trait.Product.html)
5367 * [`iter::Sum`](https://doc.rust-lang.org/std/iter/trait.Sum.html)
5368 * [`OccupiedEntry::remove_entry`](https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.remove_entry)
5369 * [`VacantEntry::into_key`](https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.into_key)
5374 * [The `format!` macro and friends now allow a single argument to be formatted
5375 in multiple styles](https://github.com/rust-lang/rust/pull/33642)
5376 * [The lifetime bounds on `[T]::binary_search_by` and
5377 `[T]::binary_search_by_key` have been adjusted to be more flexible](https://github.com/rust-lang/rust/pull/34762)
5378 * [`Option` implements `From` for its contained type](https://github.com/rust-lang/rust/pull/34828)
5379 * [`Cell`, `RefCell` and `UnsafeCell` implement `From` for their contained type](https://github.com/rust-lang/rust/pull/35392)
5380 * [`RwLock` panics if the reader count overflows](https://github.com/rust-lang/rust/pull/35378)
5381 * [`vec_deque::Drain`, `hash_map::Drain` and `hash_set::Drain` are covariant](https://github.com/rust-lang/rust/pull/35354)
5382 * [`vec::Drain` and `binary_heap::Drain` are covariant](https://github.com/rust-lang/rust/pull/34951)
5383 * [`Cow<str>` implements `FromIterator` for `char`, `&str` and `String`](https://github.com/rust-lang/rust/pull/35064)
5384 * [Sockets on Linux are correctly closed in subprocesses via `SOCK_CLOEXEC`](https://github.com/rust-lang/rust/pull/34946)
5385 * [`hash_map::Entry`, `hash_map::VacantEntry` and `hash_map::OccupiedEntry`
5386 implement `Debug`](https://github.com/rust-lang/rust/pull/34937)
5387 * [`btree_map::Entry`, `btree_map::VacantEntry` and `btree_map::OccupiedEntry`
5388 implement `Debug`](https://github.com/rust-lang/rust/pull/34885)
5389 * [`String` implements `AddAssign`](https://github.com/rust-lang/rust/pull/34890)
5390 * [Variadic `extern fn` pointers implement the `Clone`, `PartialEq`, `Eq`,
5391 `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and `fmt::Debug` traits](https://github.com/rust-lang/rust/pull/34879)
5392 * [`FileType` implements `Debug`](https://github.com/rust-lang/rust/pull/34757)
5393 * [References to `Mutex` and `RwLock` are unwind-safe](https://github.com/rust-lang/rust/pull/34756)
5394 * [`mpsc::sync_channel` `Receiver`s return any available message before
5395 reporting a disconnect](https://github.com/rust-lang/rust/pull/34731)
5396 * [Unicode definitions have been updated to 9.0](https://github.com/rust-lang/rust/pull/34599)
5397 * [`env` iterators implement `DoubleEndedIterator`](https://github.com/rust-lang/rust/pull/33312)
5402 * [Support local mirrors of registries](https://github.com/rust-lang/cargo/pull/2857)
5403 * [Add support for command aliases](https://github.com/rust-lang/cargo/pull/2679)
5404 * [Allow `opt-level="s"` / `opt-level="z"` in profile overrides](https://github.com/rust-lang/cargo/pull/3007)
5405 * [Make `cargo doc --open --target` work as expected](https://github.com/rust-lang/cargo/pull/2988)
5406 * [Speed up noop registry updates](https://github.com/rust-lang/cargo/pull/2974)
5407 * [Update OpenSSL](https://github.com/rust-lang/cargo/pull/2971)
5408 * [Fix `--panic=abort` with plugins](https://github.com/rust-lang/cargo/pull/2954)
5409 * [Always pass `-C metadata` to the compiler](https://github.com/rust-lang/cargo/pull/2946)
5410 * [Fix depending on git repos with workspaces](https://github.com/rust-lang/cargo/pull/2938)
5411 * [Add a `--lib` flag to `cargo new`](https://github.com/rust-lang/cargo/pull/2921)
5412 * [Add `http.cainfo` for custom certs](https://github.com/rust-lang/cargo/pull/2917)
5413 * [Indicate the compilation profile after compiling](https://github.com/rust-lang/cargo/pull/2909)
5414 * [Allow enabling features for dependencies with `--features`](https://github.com/rust-lang/cargo/pull/2876)
5415 * [Add `--jobs` flag to `cargo package`](https://github.com/rust-lang/cargo/pull/2867)
5416 * [Add `--dry-run` to `cargo publish`](https://github.com/rust-lang/cargo/pull/2849)
5417 * [Add support for `RUSTDOCFLAGS`](https://github.com/rust-lang/cargo/pull/2794)
5422 * [`panic::catch_unwind` is more optimized](https://github.com/rust-lang/rust/pull/35444)
5423 * [`panic::catch_unwind` no longer accesses thread-local storage on entry](https://github.com/rust-lang/rust/pull/34866)
5428 * [Test binaries now support a `--test-threads` argument to specify the number
5429 of threads used to run tests, and which acts the same as the
5430 `RUST_TEST_THREADS` environment variable](https://github.com/rust-lang/rust/pull/35414)
5431 * [The test runner now emits a warning when tests run over 60 seconds](https://github.com/rust-lang/rust/pull/35405)
5432 * [rustdoc: Fix methods in search results](https://github.com/rust-lang/rust/pull/34752)
5433 * [`rust-lldb` warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5434 * [Rust releases now come with source packages that can be installed by rustup
5435 via `rustup component add rust-src`](https://github.com/rust-lang/rust/pull/34366).
5436 The resulting source code can be used by tools and IDES, located in the
5437 sysroot under `lib/rustlib/src`.
5442 * [The compiler can now be built against LLVM 3.9](https://github.com/rust-lang/rust/pull/35594)
5443 * Many minor improvements to the documentation.
5444 * [The Rust exception handling "personality" routine is now written in Rust](https://github.com/rust-lang/rust/pull/34832)
5449 * [When printing Windows `OsStr`s, unpaired surrogate codepoints are escaped
5450 with the lowercase format instead of the uppercase](https://github.com/rust-lang/rust/pull/35084)
5451 * [When formatting strings, if "precision" is specified, the "fill",
5452 "align" and "width" specifiers are no longer ignored](https://github.com/rust-lang/rust/pull/34544)
5453 * [The `Debug` impl for strings no longer escapes all non-ASCII characters](https://github.com/rust-lang/rust/pull/34485)
5456 Version 1.11.0 (2016-08-18)
5457 ===========================
5462 * [Support nested `cfg_attr` attributes](https://github.com/rust-lang/rust/pull/34216)
5463 * [Allow statement-generating braced macro invocations at the end of blocks](https://github.com/rust-lang/rust/pull/34436)
5464 * [Macros can be expanded inside of trait definitions](https://github.com/rust-lang/rust/pull/34213)
5465 * [`#[macro_use]` works properly when it is itself expanded from a macro](https://github.com/rust-lang/rust/pull/34032)
5470 * [`BinaryHeap::append`](https://doc.rust-lang.org/std/collections/binary_heap/struct.BinaryHeap.html#method.append)
5471 * [`BTreeMap::append`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.append)
5472 * [`BTreeMap::split_off`](https://doc.rust-lang.org/std/collections/btree_map/struct.BTreeMap.html#method.split_off)
5473 * [`BTreeSet::append`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.append)
5474 * [`BTreeSet::split_off`](https://doc.rust-lang.org/std/collections/btree_set/struct.BTreeSet.html#method.split_off)
5475 * [`f32::to_degrees`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_degrees)
5476 (in libcore - previously stabilized in libstd)
5477 * [`f32::to_radians`](https://doc.rust-lang.org/std/primitive.f32.html#method.to_radians)
5478 (in libcore - previously stabilized in libstd)
5479 * [`f64::to_degrees`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_degrees)
5480 (in libcore - previously stabilized in libstd)
5481 * [`f64::to_radians`](https://doc.rust-lang.org/std/primitive.f64.html#method.to_radians)
5482 (in libcore - previously stabilized in libstd)
5483 * [`Iterator::sum`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5484 * [`Iterator::product`](https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.sum)
5485 * [`Cell::get_mut`](https://doc.rust-lang.org/std/cell/struct.Cell.html#method.get_mut)
5486 * [`RefCell::get_mut`](https://doc.rust-lang.org/std/cell/struct.RefCell.html#method.get_mut)
5491 * [The `thread_local!` macro supports multiple definitions in a single
5492 invocation, and can apply attributes](https://github.com/rust-lang/rust/pull/34077)
5493 * [`Cow` implements `Default`](https://github.com/rust-lang/rust/pull/34305)
5494 * [`Wrapping` implements binary, octal, lower-hex and upper-hex
5495 `Display` formatting](https://github.com/rust-lang/rust/pull/34190)
5496 * [The range types implement `Hash`](https://github.com/rust-lang/rust/pull/34180)
5497 * [`lookup_host` ignores unknown address types](https://github.com/rust-lang/rust/pull/34067)
5498 * [`assert_eq!` accepts a custom error message, like `assert!` does](https://github.com/rust-lang/rust/pull/33976)
5499 * [The main thread is now called "main" instead of "<main>"](https://github.com/rust-lang/rust/pull/33803)
5504 * [Disallow specifying features of transitive deps](https://github.com/rust-lang/cargo/pull/2821)
5505 * [Add color support for Windows consoles](https://github.com/rust-lang/cargo/pull/2804)
5506 * [Fix `harness = false` on `[lib]` sections](https://github.com/rust-lang/cargo/pull/2795)
5507 * [Don't panic when `links` contains a '.'](https://github.com/rust-lang/cargo/pull/2787)
5508 * [Build scripts can emit warnings](https://github.com/rust-lang/cargo/pull/2630),
5509 and `-vv` prints warnings for all crates.
5510 * [Ignore file locks on OS X NFS mounts](https://github.com/rust-lang/cargo/pull/2720)
5511 * [Don't warn about `package.metadata` keys](https://github.com/rust-lang/cargo/pull/2668).
5512 This provides room for expansion by arbitrary tools.
5513 * [Add support for cdylib crate types](https://github.com/rust-lang/cargo/pull/2741)
5514 * [Prevent publishing crates when files are dirty](https://github.com/rust-lang/cargo/pull/2781)
5515 * [Don't fetch all crates on clean](https://github.com/rust-lang/cargo/pull/2704)
5516 * [Propagate --color option to rustc](https://github.com/rust-lang/cargo/pull/2779)
5517 * [Fix `cargo doc --open` on Windows](https://github.com/rust-lang/cargo/pull/2780)
5518 * [Improve autocompletion](https://github.com/rust-lang/cargo/pull/2772)
5519 * [Configure colors of stderr as well as stdout](https://github.com/rust-lang/cargo/pull/2739)
5524 * [Caching projections speeds up type check dramatically for some
5525 workloads](https://github.com/rust-lang/rust/pull/33816)
5526 * [The default `HashMap` hasher is SipHash 1-3 instead of SipHash 2-4](https://github.com/rust-lang/rust/pull/33940)
5527 This hasher is faster, but is believed to provide sufficient
5528 protection from collision attacks.
5529 * [Comparison of `Ipv4Addr` is 10x faster](https://github.com/rust-lang/rust/pull/33891)
5534 * [Fix empty implementation section on some module pages](https://github.com/rust-lang/rust/pull/34536)
5535 * [Fix inlined renamed re-exports in import lists](https://github.com/rust-lang/rust/pull/34479)
5536 * [Fix search result layout for enum variants and struct fields](https://github.com/rust-lang/rust/pull/34477)
5537 * [Fix issues with source links to external crates](https://github.com/rust-lang/rust/pull/34387)
5538 * [Fix redirect pages for renamed re-exports](https://github.com/rust-lang/rust/pull/34245)
5543 * [rustc is better at finding the MSVC toolchain](https://github.com/rust-lang/rust/pull/34492)
5544 * [When emitting debug info, rustc emits frame pointers for closures,
5545 shims and glue, as it does for all other functions](https://github.com/rust-lang/rust/pull/33909)
5546 * [rust-lldb warns about unsupported versions of LLDB](https://github.com/rust-lang/rust/pull/34646)
5547 * Many more errors have been given error codes and extended
5549 * API documentation continues to be improved, with many new examples
5554 * [rustc no longer hangs when dependencies recursively re-export
5555 submodules](https://github.com/rust-lang/rust/pull/34542)
5556 * [rustc requires LLVM 3.7+](https://github.com/rust-lang/rust/pull/34104)
5557 * [The 'How Safe and Unsafe Interact' chapter of The Rustonomicon was
5558 rewritten](https://github.com/rust-lang/rust/pull/33895)
5559 * [rustc support 16-bit pointer sizes](https://github.com/rust-lang/rust/pull/33460).
5560 No targets use this yet, but it works toward AVR support.
5565 * [`const`s and `static`s may not have unsized types](https://github.com/rust-lang/rust/pull/34443)
5566 * [The new follow-set rules that place restrictions on `macro_rules!`
5567 in order to ensure syntax forward-compatibility have been enabled](https://github.com/rust-lang/rust/pull/33982)
5568 This was an [amendment to RFC 550](https://github.com/rust-lang/rfcs/pull/1384),
5569 and has been a warning since 1.10.
5570 * [`cfg` attribute process has been refactored to fix various bugs](https://github.com/rust-lang/rust/pull/33706).
5571 This causes breakage in some corner cases.
5574 Version 1.10.0 (2016-07-07)
5575 ===========================
5580 * [`Copy` types are required to have a trivial implementation of `Clone`](https://github.com/rust-lang/rust/pull/33420).
5581 [RFC 1521](https://github.com/rust-lang/rfcs/blob/master/text/1521-copy-clone-semantics.md).
5582 * [Single-variant enums support the `#[repr(..)]` attribute](https://github.com/rust-lang/rust/pull/33355).
5583 * [Fix `#[derive(RustcEncodable)]` in the presence of other `encode` methods](https://github.com/rust-lang/rust/pull/32908).
5584 * [`panic!` can be converted to a runtime abort with the
5585 `-C panic=abort` flag](https://github.com/rust-lang/rust/pull/32900).
5586 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5587 * [Add a new crate type, 'cdylib'](https://github.com/rust-lang/rust/pull/33553).
5588 cdylibs are dynamic libraries suitable for loading by non-Rust hosts.
5589 [RFC 1510](https://github.com/rust-lang/rfcs/blob/master/text/1510-cdylib.md).
5590 Note that Cargo does not yet directly support cdylibs.
5595 * `os::windows::fs::OpenOptionsExt::access_mode`
5596 * `os::windows::fs::OpenOptionsExt::share_mode`
5597 * `os::windows::fs::OpenOptionsExt::custom_flags`
5598 * `os::windows::fs::OpenOptionsExt::attributes`
5599 * `os::windows::fs::OpenOptionsExt::security_qos_flags`
5600 * `os::unix::fs::OpenOptionsExt::custom_flags`
5601 * [`sync::Weak::new`](http://doc.rust-lang.org/alloc/arc/struct.Weak.html#method.new)
5602 * `Default for sync::Weak`
5603 * [`panic::set_hook`](http://doc.rust-lang.org/std/panic/fn.set_hook.html)
5604 * [`panic::take_hook`](http://doc.rust-lang.org/std/panic/fn.take_hook.html)
5605 * [`panic::PanicInfo`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html)
5606 * [`panic::PanicInfo::payload`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.payload)
5607 * [`panic::PanicInfo::location`](http://doc.rust-lang.org/std/panic/struct.PanicInfo.html#method.location)
5608 * [`panic::Location`](http://doc.rust-lang.org/std/panic/struct.Location.html)
5609 * [`panic::Location::file`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.file)
5610 * [`panic::Location::line`](http://doc.rust-lang.org/std/panic/struct.Location.html#method.line)
5611 * [`ffi::CStr::from_bytes_with_nul`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul)
5612 * [`ffi::CStr::from_bytes_with_nul_unchecked`](http://doc.rust-lang.org/std/ffi/struct.CStr.html#method.from_bytes_with_nul_unchecked)
5613 * [`ffi::FromBytesWithNulError`](http://doc.rust-lang.org/std/ffi/struct.FromBytesWithNulError.html)
5614 * [`fs::Metadata::modified`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.modified)
5615 * [`fs::Metadata::accessed`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.accessed)
5616 * [`fs::Metadata::created`](http://doc.rust-lang.org/std/fs/struct.Metadata.html#method.created)
5617 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange`
5618 * `sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak`
5619 * `collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key`
5620 * `os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}`
5621 * [`SocketAddr::is_unnamed`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.is_unnamed)
5622 * [`SocketAddr::as_pathname`](http://doc.rust-lang.org/std/os/unix/net/struct.SocketAddr.html#method.as_pathname)
5623 * [`UnixStream::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.connect)
5624 * [`UnixStream::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.pair)
5625 * [`UnixStream::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.try_clone)
5626 * [`UnixStream::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.local_addr)
5627 * [`UnixStream::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.peer_addr)
5628 * [`UnixStream::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5629 * [`UnixStream::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5630 * [`UnixStream::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.read_timeout)
5631 * [`UnixStream::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.write_timeout)
5632 * [`UnixStream::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.set_nonblocking)
5633 * [`UnixStream::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.take_error)
5634 * [`UnixStream::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixStream.html#method.shutdown)
5635 * Read/Write/RawFd impls for `UnixStream`
5636 * [`UnixListener::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.bind)
5637 * [`UnixListener::accept`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.accept)
5638 * [`UnixListener::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.try_clone)
5639 * [`UnixListener::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.local_addr)
5640 * [`UnixListener::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.set_nonblocking)
5641 * [`UnixListener::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.take_error)
5642 * [`UnixListener::incoming`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixListener.html#method.incoming)
5643 * RawFd impls for `UnixListener`
5644 * [`UnixDatagram::bind`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.bind)
5645 * [`UnixDatagram::unbound`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.unbound)
5646 * [`UnixDatagram::pair`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.pair)
5647 * [`UnixDatagram::connect`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.connect)
5648 * [`UnixDatagram::try_clone`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.try_clone)
5649 * [`UnixDatagram::local_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.local_addr)
5650 * [`UnixDatagram::peer_addr`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.peer_addr)
5651 * [`UnixDatagram::recv_from`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv_from)
5652 * [`UnixDatagram::recv`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.recv)
5653 * [`UnixDatagram::send_to`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send_to)
5654 * [`UnixDatagram::send`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.send)
5655 * [`UnixDatagram::set_read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_read_timeout)
5656 * [`UnixDatagram::set_write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_write_timeout)
5657 * [`UnixDatagram::read_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.read_timeout)
5658 * [`UnixDatagram::write_timeout`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.write_timeout)
5659 * [`UnixDatagram::set_nonblocking`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.set_nonblocking)
5660 * [`UnixDatagram::take_error`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.take_error)
5661 * [`UnixDatagram::shutdown`](http://doc.rust-lang.org/std/os/unix/net/struct.UnixDatagram.html#method.shutdown)
5662 * RawFd impls for `UnixDatagram`
5663 * `{BTree,Hash}Map::values_mut`
5664 * [`<[_]>::binary_search_by_key`](http://doc.rust-lang.org/std/primitive.slice.html#method.binary_search_by_key)
5669 * [The `abs_sub` method of floats is deprecated](https://github.com/rust-lang/rust/pull/33664).
5670 The semantics of this minor method are subtle and probably not what
5672 * [Add implementation of Ord for Cell<T> and RefCell<T> where T: Ord](https://github.com/rust-lang/rust/pull/33306).
5673 * [On Linux, if `HashMap`s can't be initialized with `getrandom` they
5674 will fall back to `/dev/urandom` temporarily to avoid blocking
5675 during early boot](https://github.com/rust-lang/rust/pull/33086).
5676 * [Implemented negation for wrapping numerals](https://github.com/rust-lang/rust/pull/33067).
5677 * [Implement `Clone` for `binary_heap::IntoIter`](https://github.com/rust-lang/rust/pull/33050).
5678 * [Implement `Display` and `Hash` for `std::num::Wrapping`](https://github.com/rust-lang/rust/pull/33023).
5679 * [Add `Default` implementation for `&CStr`, `CString`](https://github.com/rust-lang/rust/pull/32990).
5680 * [Implement `From<Vec<T>>` and `Into<Vec<T>>` for `VecDeque<T>`](https://github.com/rust-lang/rust/pull/32866).
5681 * [Implement `Default` for `UnsafeCell`, `fmt::Error`, `Condvar`,
5682 `Mutex`, `RwLock`](https://github.com/rust-lang/rust/pull/32785).
5686 * [Cargo.toml supports the `profile.*.panic` option](https://github.com/rust-lang/cargo/pull/2687).
5687 This controls the runtime behavior of the `panic!` macro
5688 and can be either "unwind" (the default), or "abort".
5689 [RFC 1513](https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md).
5690 * [Don't throw away errors with `-p` arguments](https://github.com/rust-lang/cargo/pull/2723).
5691 * [Report status to stderr instead of stdout](https://github.com/rust-lang/cargo/pull/2693).
5692 * [Build scripts are passed a `CARGO_MANIFEST_LINKS` environment
5693 variable that corresponds to the `links` field of the manifest](https://github.com/rust-lang/cargo/pull/2710).
5694 * [Ban keywords from crate names](https://github.com/rust-lang/cargo/pull/2707).
5695 * [Canonicalize `CARGO_HOME` on Windows](https://github.com/rust-lang/cargo/pull/2604).
5696 * [Retry network requests](https://github.com/rust-lang/cargo/pull/2396).
5697 By default they are retried twice, which can be customized with the
5698 `net.retry` value in `.cargo/config`.
5699 * [Don't print extra error info for failing subcommands](https://github.com/rust-lang/cargo/pull/2674).
5700 * [Add `--force` flag to `cargo install`](https://github.com/rust-lang/cargo/pull/2405).
5701 * [Don't use `flock` on NFS mounts](https://github.com/rust-lang/cargo/pull/2623).
5702 * [Prefer building `cargo install` artifacts in temporary directories](https://github.com/rust-lang/cargo/pull/2610).
5703 Makes it possible to install multiple crates in parallel.
5704 * [Add `cargo test --doc`](https://github.com/rust-lang/cargo/pull/2578).
5705 * [Add `cargo --explain`](https://github.com/rust-lang/cargo/pull/2551).
5706 * [Don't print warnings when `-q` is passed](https://github.com/rust-lang/cargo/pull/2576).
5707 * [Add `cargo doc --lib` and `--bin`](https://github.com/rust-lang/cargo/pull/2577).
5708 * [Don't require build script output to be UTF-8](https://github.com/rust-lang/cargo/pull/2560).
5709 * [Correctly attempt multiple git usernames](https://github.com/rust-lang/cargo/pull/2584).
5714 * [rustc memory usage was reduced by refactoring the context used for
5715 type checking](https://github.com/rust-lang/rust/pull/33425).
5716 * [Speed up creation of `HashMap`s by caching the random keys used
5717 to initialize the hash state](https://github.com/rust-lang/rust/pull/33318).
5718 * [The `find` implementation for `Chain` iterators is 2x faster](https://github.com/rust-lang/rust/pull/33289).
5719 * [Trait selection optimizations speed up type checking by 15%](https://github.com/rust-lang/rust/pull/33138).
5720 * [Efficient trie lookup for boolean Unicode properties](https://github.com/rust-lang/rust/pull/33098).
5721 10x faster than the previous lookup tables.
5722 * [Special case `#[derive(Copy, Clone)]` to avoid bloat](https://github.com/rust-lang/rust/pull/31414).
5727 * Many incremental improvements to documentation and rustdoc.
5728 * [rustdoc: List blanket trait impls](https://github.com/rust-lang/rust/pull/33514).
5729 * [rustdoc: Clean up ABI rendering](https://github.com/rust-lang/rust/pull/33151).
5730 * [Indexing with the wrong type produces a more informative error](https://github.com/rust-lang/rust/pull/33401).
5731 * [Improve diagnostics for constants being used in irrefutable patterns](https://github.com/rust-lang/rust/pull/33406).
5732 * [When many method candidates are in scope limit the suggestions to 10](https://github.com/rust-lang/rust/pull/33338).
5733 * [Remove confusing suggestion when calling a `fn` type](https://github.com/rust-lang/rust/pull/33325).
5734 * [Do not suggest changing `&mut self` to `&mut mut self`](https://github.com/rust-lang/rust/pull/33319).
5739 * [Update i686-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33651).
5740 * [Update aarch64-linux-android features to match Android ABI](https://github.com/rust-lang/rust/pull/33500).
5741 * [`std` no longer prints backtraces on platforms where the running
5742 module must be loaded with `env::current_exe`, which can't be relied
5743 on](https://github.com/rust-lang/rust/pull/33554).
5744 * This release includes std binaries for the i586-unknown-linux-gnu,
5745 i686-unknown-linux-musl, and armv7-linux-androideabi targets. The
5746 i586 target is for old x86 hardware without SSE2, and the armv7
5747 target is for Android running on modern ARM architectures.
5748 * [The `rust-gdb` and `rust-lldb` scripts are distributed on all
5749 Unix platforms](https://github.com/rust-lang/rust/pull/32835).
5750 * [On Unix the runtime aborts by calling `libc::abort` instead of
5751 generating an illegal instruction](https://github.com/rust-lang/rust/pull/31457).
5752 * [Rust is now bootstrapped from the previous release of Rust,
5753 instead of a snapshot from an arbitrary commit](https://github.com/rust-lang/rust/pull/32942).
5758 * [`AtomicBool` is now bool-sized, not word-sized](https://github.com/rust-lang/rust/pull/33579).
5759 * [`target_env` for Linux ARM targets is just `gnu`, not
5760 `gnueabihf`, `gnueabi`, etc](https://github.com/rust-lang/rust/pull/33403).
5761 * [Consistently panic on overflow in `Duration::new`](https://github.com/rust-lang/rust/pull/33072).
5762 * [Change `String::truncate` to panic less](https://github.com/rust-lang/rust/pull/32977).
5763 * [Add `:block` to the follow set for `:ty` and `:path`](https://github.com/rust-lang/rust/pull/32945).
5764 Affects how macros are parsed.
5765 * [Fix macro hygiene bug](https://github.com/rust-lang/rust/pull/32923).
5766 * [Feature-gated attributes on macro-generated macro invocations are
5767 now rejected](https://github.com/rust-lang/rust/pull/32791).
5768 * [Suppress fallback and ambiguity errors during type inference](https://github.com/rust-lang/rust/pull/32258).
5769 This caused some minor changes to type inference.
5772 Version 1.9.0 (2016-05-26)
5773 ==========================
5778 * The `#[deprecated]` attribute when applied to an API will generate
5779 warnings when used. The warnings may be suppressed with
5780 `#[allow(deprecated)]`. [RFC 1270].
5781 * [`fn` item types are zero sized, and each `fn` names a unique
5782 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5783 `transmute` on a `fn` type will generate a warning for a few cycles,
5784 then will be converted to an error.
5785 * [Field and method resolution understand visibility, so private
5786 fields and methods cannot prevent the proper use of public fields
5787 and methods][1.9fv].
5788 * [The parser considers unicode codepoints in the
5789 `PATTERN_WHITE_SPACE` category to be whitespace][1.9ws].
5795 * [`std::panic::catch_unwind`] (renamed from `recover`)
5796 * [`std::panic::resume_unwind`] (renamed from `propagate`)
5797 * [`std::panic::AssertUnwindSafe`] (renamed from `AssertRecoverSafe`)
5798 * [`std::panic::UnwindSafe`] (renamed from `RecoverSafe`)
5799 * [`str::is_char_boundary`]
5800 * [`<*const T>::as_ref`]
5801 * [`<*mut T>::as_ref`]
5802 * [`<*mut T>::as_mut`]
5803 * [`AsciiExt::make_ascii_uppercase`]
5804 * [`AsciiExt::make_ascii_lowercase`]
5805 * [`char::decode_utf16`]
5806 * [`char::DecodeUtf16`]
5807 * [`char::DecodeUtf16Error`]
5808 * [`char::DecodeUtf16Error::unpaired_surrogate`]
5809 * [`BTreeSet::take`]
5810 * [`BTreeSet::replace`]
5813 * [`HashSet::replace`]
5815 * [`OsString::with_capacity`]
5816 * [`OsString::clear`]
5817 * [`OsString::capacity`]
5818 * [`OsString::reserve`]
5819 * [`OsString::reserve_exact`]
5820 * [`OsStr::is_empty`]
5822 * [`std::os::unix::thread`]
5825 * [`JoinHandleExt::as_pthread_t`]
5826 * [`JoinHandleExt::into_pthread_t`]
5827 * [`HashSet::hasher`]
5828 * [`HashMap::hasher`]
5829 * [`CommandExt::exec`]
5830 * [`File::try_clone`]
5831 * [`SocketAddr::set_ip`]
5832 * [`SocketAddr::set_port`]
5833 * [`SocketAddrV4::set_ip`]
5834 * [`SocketAddrV4::set_port`]
5835 * [`SocketAddrV6::set_ip`]
5836 * [`SocketAddrV6::set_port`]
5837 * [`SocketAddrV6::set_flowinfo`]
5838 * [`SocketAddrV6::set_scope_id`]
5839 * [`slice::copy_from_slice`]
5840 * [`ptr::read_volatile`]
5841 * [`ptr::write_volatile`]
5842 * [`OpenOptions::create_new`]
5843 * [`TcpStream::set_nodelay`]
5844 * [`TcpStream::nodelay`]
5845 * [`TcpStream::set_ttl`]
5846 * [`TcpStream::ttl`]
5847 * [`TcpStream::set_only_v6`]
5848 * [`TcpStream::only_v6`]
5849 * [`TcpStream::take_error`]
5850 * [`TcpStream::set_nonblocking`]
5851 * [`TcpListener::set_ttl`]
5852 * [`TcpListener::ttl`]
5853 * [`TcpListener::set_only_v6`]
5854 * [`TcpListener::only_v6`]
5855 * [`TcpListener::take_error`]
5856 * [`TcpListener::set_nonblocking`]
5857 * [`UdpSocket::set_broadcast`]
5858 * [`UdpSocket::broadcast`]
5859 * [`UdpSocket::set_multicast_loop_v4`]
5860 * [`UdpSocket::multicast_loop_v4`]
5861 * [`UdpSocket::set_multicast_ttl_v4`]
5862 * [`UdpSocket::multicast_ttl_v4`]
5863 * [`UdpSocket::set_multicast_loop_v6`]
5864 * [`UdpSocket::multicast_loop_v6`]
5865 * [`UdpSocket::set_multicast_ttl_v6`]
5866 * [`UdpSocket::multicast_ttl_v6`]
5867 * [`UdpSocket::set_ttl`]
5868 * [`UdpSocket::ttl`]
5869 * [`UdpSocket::set_only_v6`]
5870 * [`UdpSocket::only_v6`]
5871 * [`UdpSocket::join_multicast_v4`]
5872 * [`UdpSocket::join_multicast_v6`]
5873 * [`UdpSocket::leave_multicast_v4`]
5874 * [`UdpSocket::leave_multicast_v6`]
5875 * [`UdpSocket::take_error`]
5876 * [`UdpSocket::connect`]
5877 * [`UdpSocket::send`]
5878 * [`UdpSocket::recv`]
5879 * [`UdpSocket::set_nonblocking`]
5884 * [`std::sync::Once` is poisoned if its initialization function
5886 * [`cell::Ref` and `cell::RefMut` can contain unsized types][1.9cu].
5887 * [Most types implement `fmt::Debug`][1.9db].
5888 * [The default buffer size used by `BufReader` and `BufWriter` was
5889 reduced to 8K, from 64K][1.9bf]. This is in line with the buffer size
5890 used by other languages.
5891 * [`Instant`, `SystemTime` and `Duration` implement `+=` and `-=`.
5892 `Duration` additionally implements `*=` and `/=`][1.9ta].
5893 * [`Skip` is a `DoubleEndedIterator`][1.9sk].
5894 * [`From<[u8; 4]>` is implemented for `Ipv4Addr`][1.9fi].
5895 * [`Chain` implements `BufRead`][1.9ch].
5896 * [`HashMap`, `HashSet` and iterators are covariant][1.9hc].
5901 * [Cargo can now run concurrently][1.9cc].
5902 * [Top-level overrides allow specific revisions of crates to be
5903 overridden through the entire crate graph][1.9ct]. This is intended
5904 to make upgrades easier for large projects, by allowing crates to be
5905 forked temporarily until they've been upgraded and republished.
5906 * [Cargo exports a `CARGO_PKG_AUTHORS` environment variable][1.9cp].
5907 * [Cargo will pass the contents of the `RUSTFLAGS` variable to `rustc`
5908 on the commandline][1.9cf]. `rustc` arguments can also be specified
5909 in the `build.rustflags` configuration key.
5914 * [The time complexity of comparing variables for equivalence during type
5915 unification is reduced from _O_(_n_!) to _O_(_n_)][1.9tu]. This leads
5916 to major compilation time improvement in some scenarios.
5917 * [`ToString` is specialized for `str`, giving it the same performance
5918 as `to_owned`][1.9ts].
5919 * [Spawning processes with `Command::output` no longer creates extra
5921 * [`#[derive(PartialEq)]` and `#[derive(PartialOrd)]` emit less code
5922 for C-like enums][1.9cl].
5927 * [Passing the `--quiet` flag to a test runner will produce
5928 much-abbreviated output][1.9q].
5929 * The Rust Project now publishes std binaries for the
5930 `mips-unknown-linux-musl`, `mipsel-unknown-linux-musl`, and
5931 `i586-pc-windows-msvc` targets.
5936 * [`std::sync::Once` is poisoned if its initialization function
5938 * [It is illegal to define methods with the same name in overlapping
5939 inherent `impl` blocks][1.9sn].
5940 * [`fn` item types are zero sized, and each `fn` names a unique
5941 type][1.9fn]. This will break code that transmutes `fn`s, so calling
5942 `transmute` on a `fn` type will generate a warning for a few cycles,
5943 then will be converted to an error.
5944 * [Improvements to const evaluation may trigger new errors when integer
5945 literals are out of range][1.9ce].
5948 [1.9bf]: https://github.com/rust-lang/rust/pull/32695
5949 [1.9cc]: https://github.com/rust-lang/cargo/pull/2486
5950 [1.9ce]: https://github.com/rust-lang/rust/pull/30587
5951 [1.9cf]: https://github.com/rust-lang/cargo/pull/2241
5952 [1.9ch]: https://github.com/rust-lang/rust/pull/32541
5953 [1.9cl]: https://github.com/rust-lang/rust/pull/31977
5954 [1.9cp]: https://github.com/rust-lang/cargo/pull/2465
5955 [1.9ct]: https://github.com/rust-lang/cargo/pull/2385
5956 [1.9cu]: https://github.com/rust-lang/rust/pull/32652
5957 [1.9db]: https://github.com/rust-lang/rust/pull/32054
5958 [1.9fi]: https://github.com/rust-lang/rust/pull/32050
5959 [1.9fn]: https://github.com/rust-lang/rust/pull/31710
5960 [1.9fv]: https://github.com/rust-lang/rust/pull/31938
5961 [1.9hc]: https://github.com/rust-lang/rust/pull/32635
5962 [1.9o]: https://github.com/rust-lang/rust/pull/32325
5963 [1.9q]: https://github.com/rust-lang/rust/pull/31887
5964 [1.9sk]: https://github.com/rust-lang/rust/pull/31700
5965 [1.9sn]: https://github.com/rust-lang/rust/pull/31925
5966 [1.9sp]: https://github.com/rust-lang/rust/pull/31618
5967 [1.9ta]: https://github.com/rust-lang/rust/pull/32448
5968 [1.9ts]: https://github.com/rust-lang/rust/pull/32586
5969 [1.9tu]: https://github.com/rust-lang/rust/pull/32062
5970 [1.9ws]: https://github.com/rust-lang/rust/pull/29734
5971 [RFC 1270]: https://github.com/rust-lang/rfcs/blob/master/text/1270-deprecation.md
5972 [`<*const T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5973 [`<*mut T>::as_mut`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_mut
5974 [`<*mut T>::as_ref`]: http://doc.rust-lang.org/nightly/std/primitive.pointer.html#method.as_ref
5975 [`slice::copy_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.copy_from_slice
5976 [`AsciiExt::make_ascii_lowercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_lowercase
5977 [`AsciiExt::make_ascii_uppercase`]: http://doc.rust-lang.org/nightly/std/ascii/trait.AsciiExt.html#tymethod.make_ascii_uppercase
5978 [`BTreeSet::get`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.get
5979 [`BTreeSet::replace`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.replace
5980 [`BTreeSet::take`]: http://doc.rust-lang.org/nightly/collections/btree/set/struct.BTreeSet.html#method.take
5981 [`CommandExt::exec`]: http://doc.rust-lang.org/nightly/std/os/unix/process/trait.CommandExt.html#tymethod.exec
5982 [`File::try_clone`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html#method.try_clone
5983 [`HashMap::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.hasher
5984 [`HashSet::get`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.get
5985 [`HashSet::hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.hasher
5986 [`HashSet::replace`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.replace
5987 [`HashSet::take`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.take
5988 [`JoinHandleExt::as_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.as_pthread_t
5989 [`JoinHandleExt::into_pthread_t`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html#tymethod.into_pthread_t
5990 [`JoinHandleExt`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/trait.JoinHandleExt.html
5991 [`OpenOptions::create_new`]: http://doc.rust-lang.org/nightly/std/fs/struct.OpenOptions.html#method.create_new
5992 [`OsStr::is_empty`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.is_empty
5993 [`OsStr::len`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsStr.html#method.len
5994 [`OsString::capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.capacity
5995 [`OsString::clear`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.clear
5996 [`OsString::reserve_exact`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve_exact
5997 [`OsString::reserve`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.reserve
5998 [`OsString::with_capacity`]: http://doc.rust-lang.org/nightly/std/ffi/struct.OsString.html#method.with_capacity
5999 [`RawPthread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/type.RawPthread.html
6000 [`SocketAddr::set_ip`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_ip
6001 [`SocketAddr::set_port`]: http://doc.rust-lang.org/nightly/std/net/enum.SocketAddr.html#method.set_port
6002 [`SocketAddrV4::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_ip
6003 [`SocketAddrV4::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV4.html#method.set_port
6004 [`SocketAddrV6::set_flowinfo`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_flowinfo
6005 [`SocketAddrV6::set_ip`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_ip
6006 [`SocketAddrV6::set_port`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_port
6007 [`SocketAddrV6::set_scope_id`]: http://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html#method.set_scope_id
6008 [`TcpListener::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6009 [`TcpListener::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6010 [`TcpListener::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6011 [`TcpListener::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6012 [`TcpListener::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6013 [`TcpListener::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6014 [`TcpStream::nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.nodelay
6015 [`TcpStream::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.only_v6
6016 [`TcpStream::set_nodelay`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nodelay
6017 [`TcpStream::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_nonblocking
6018 [`TcpStream::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_only_v6
6019 [`TcpStream::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_ttl
6020 [`TcpStream::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.take_error
6021 [`TcpStream::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.ttl
6022 [`UdpSocket::broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.broadcast
6023 [`UdpSocket::connect`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.connect
6024 [`UdpSocket::join_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v4
6025 [`UdpSocket::join_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.join_multicast_v6
6026 [`UdpSocket::leave_multicast_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v4
6027 [`UdpSocket::leave_multicast_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.leave_multicast_v6
6028 [`UdpSocket::multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v4
6029 [`UdpSocket::multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_loop_v6
6030 [`UdpSocket::multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v4
6031 [`UdpSocket::multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.multicast_ttl_v6
6032 [`UdpSocket::only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.only_v6
6033 [`UdpSocket::recv`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.recv
6034 [`UdpSocket::send`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.send
6035 [`UdpSocket::set_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_broadcast
6036 [`UdpSocket::set_multicast_loop_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v4
6037 [`UdpSocket::set_multicast_loop_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_loop_v6
6038 [`UdpSocket::set_multicast_ttl_v4`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v4
6039 [`UdpSocket::set_multicast_ttl_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_multicast_ttl_v6
6040 [`UdpSocket::set_nonblocking`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_nonblocking
6041 [`UdpSocket::set_only_v6`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_only_v6
6042 [`UdpSocket::set_ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.set_ttl
6043 [`UdpSocket::take_error`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.take_error
6044 [`UdpSocket::ttl`]: http://doc.rust-lang.org/nightly/std/net/struct.UdpSocket.html#method.ttl
6045 [`char::DecodeUtf16Error::unpaired_surrogate`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html#method.unpaired_surrogate
6046 [`char::DecodeUtf16Error`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16Error.html
6047 [`char::DecodeUtf16`]: http://doc.rust-lang.org/nightly/std/char/struct.DecodeUtf16.html
6048 [`char::decode_utf16`]: http://doc.rust-lang.org/nightly/std/char/fn.decode_utf16.html
6049 [`ptr::read_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.read_volatile.html
6050 [`ptr::write_volatile`]: http://doc.rust-lang.org/nightly/std/ptr/fn.write_volatile.html
6051 [`std::os::unix::thread`]: http://doc.rust-lang.org/nightly/std/os/unix/thread/index.html
6052 [`std::panic::AssertUnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/struct.AssertUnwindSafe.html
6053 [`std::panic::UnwindSafe`]: http://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html
6054 [`std::panic::catch_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.catch_unwind.html
6055 [`std::panic::resume_unwind`]: http://doc.rust-lang.org/nightly/std/panic/fn.resume_unwind.html
6056 [`std::panic`]: http://doc.rust-lang.org/nightly/std/panic/index.html
6057 [`str::is_char_boundary`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.is_char_boundary
6060 Version 1.8.0 (2016-04-14)
6061 ==========================
6066 * Rust supports overloading of compound assignment statements like
6067 `+=` by implementing the [`AddAssign`], [`SubAssign`],
6068 [`MulAssign`], [`DivAssign`], [`RemAssign`], [`BitAndAssign`],
6069 [`BitOrAssign`], [`BitXorAssign`], [`ShlAssign`], or [`ShrAssign`]
6071 * Empty structs can be defined with braces, as in `struct Foo { }`, in
6072 addition to the non-braced form, `struct Foo;`. [RFC 218].
6078 * [`str::encode_utf16`] (renamed from `utf16_units`)
6079 * [`str::EncodeUtf16`] (renamed from `Utf16Units`)
6082 * [`ptr::drop_in_place`]
6084 * [`time::SystemTime`]
6086 * [`Instant::duration_since`] (renamed from `duration_from_earlier`)
6087 * [`Instant::elapsed`]
6088 * [`SystemTime::now`]
6089 * [`SystemTime::duration_since`] (renamed from `duration_from_earlier`)
6090 * [`SystemTime::elapsed`]
6091 * Various `Add`/`Sub` impls for `Time` and `SystemTime`
6092 * [`SystemTimeError`]
6093 * [`SystemTimeError::duration`]
6094 * Various impls for `SystemTimeError`
6096 * [`AddAssign`], [`SubAssign`], [`MulAssign`], [`DivAssign`],
6097 [`RemAssign`], [`BitAndAssign`], [`BitOrAssign`],
6098 [`BitXorAssign`], [`ShlAssign`], [`ShrAssign`].
6099 * [The `write!` and `writeln!` macros correctly emit errors if any of
6100 their arguments can't be formatted][1.8w].
6101 * [Various I/O functions support large files on 32-bit Linux][1.8l].
6102 * [The Unix-specific `raw` modules, which contain a number of
6103 redefined C types are deprecated][1.8r], including `os::raw::unix`,
6104 `os::raw::macos`, and `os::raw::linux`. These modules defined types
6105 such as `ino_t` and `dev_t`. The inconsistency of these definitions
6106 across platforms was making it difficult to implement `std`
6107 correctly. Those that need these definitions should use the `libc`
6109 * The Unix-specific `MetadataExt` traits, including
6110 `os::unix::fs::MetadataExt`, which expose values such as inode
6111 numbers [no longer return platform-specific types][1.8r], but
6112 instead return widened integers. [RFC 1415].
6113 * [`btree_set::{IntoIter, Iter, Range}` are covariant][1.8cv].
6114 * [Atomic loads and stores are not volatile][1.8a].
6115 * [All types in `sync::mpsc` implement `fmt::Debug`][1.8mp].
6120 * [Inlining hash functions lead to a 3% compile-time improvement in
6121 some workloads][1.8h].
6122 * When using jemalloc, its symbols are [unprefixed so that it
6123 overrides the libc malloc implementation][1.8h]. This means that for
6124 rustc, LLVM is now using jemalloc, which results in a 6%
6125 compile-time improvement on a specific workload.
6126 * [Avoid quadratic growth in function size due to cleanups][1.8cu].
6131 * [32-bit MSVC builds finally implement unwinding][1.8ms].
6132 i686-pc-windows-msvc is now considered a tier-1 platform.
6133 * [The `--print targets` flag prints a list of supported targets][1.8t].
6134 * [The `--print cfg` flag prints the `cfg`s defined for the current
6136 * [`rustc` can be built with an new Cargo-based build system, written
6137 in Rust][1.8b]. It will eventually replace Rust's Makefile-based
6138 build system. To enable it configure with `configure --rustbuild`.
6139 * [Errors for non-exhaustive `match` patterns now list up to 3 missing
6140 variants while also indicating the total number of missing variants
6141 if more than 3][1.8m].
6142 * [Executable stacks are disabled on Linux and BSD][1.8nx].
6143 * The Rust Project now publishes binary releases of the standard
6144 library for a number of tier-2 targets:
6145 `armv7-unknown-linux-gnueabihf`, `powerpc-unknown-linux-gnu`,
6146 `powerpc64-unknown-linux-gnu`, `powerpc64le-unknown-linux-gnu`
6147 `x86_64-rumprun-netbsd`. These can be installed with
6148 tools such as [multirust][1.8mr].
6153 * [`cargo init` creates a new Cargo project in the current
6154 directory][1.8ci]. It is otherwise like `cargo new`.
6155 * [Cargo has configuration keys for `-v` and
6156 `--color`][1.8cc]. `verbose` and `color`, respectively, go in the
6157 `[term]` section of `.cargo/config`.
6158 * [Configuration keys that evaluate to strings or integers can be set
6159 via environment variables][1.8ce]. For example the `build.jobs` key
6160 can be set via `CARGO_BUILD_JOBS`. Environment variables take
6161 precedence over config files.
6162 * [Target-specific dependencies support Rust `cfg` syntax for
6163 describing targets][1.8cfg] so that dependencies for multiple
6164 targets can be specified together. [RFC 1361].
6165 * [The environment variables `CARGO_TARGET_ROOT`, `RUSTC`, and
6166 `RUSTDOC` take precedence over the `build.target-dir`,
6167 `build.rustc`, and `build.rustdoc` configuration values][1.8cv].
6168 * [The child process tree is killed on Windows when Cargo is
6170 * [The `build.target` configuration value sets the target platform,
6171 like `--target`][1.8ct].
6176 * [Unstable compiler flags have been further restricted][1.8u]. Since
6177 1.0 `-Z` flags have been considered unstable, and other flags that
6178 were considered unstable additionally required passing `-Z
6179 unstable-options` to access. Unlike unstable language and library
6180 features though, these options have been accessible on the stable
6181 release channel. Going forward, *new unstable flags will not be
6182 available on the stable release channel*, and old unstable flags
6183 will warn about their usage. In the future, all unstable flags will
6184 be unavailable on the stable release channel.
6185 * [It is no longer possible to `match` on empty enum variants using
6186 the `Variant(..)` syntax][1.8v]. This has been a warning since 1.6.
6187 * The Unix-specific `MetadataExt` traits, including
6188 `os::unix::fs::MetadataExt`, which expose values such as inode
6189 numbers [no longer return platform-specific types][1.8r], but
6190 instead return widened integers. [RFC 1415].
6191 * [Modules sourced from the filesystem cannot appear within arbitrary
6192 blocks, but only within other modules][1.8mf].
6193 * [`--cfg` compiler flags are parsed strictly as identifiers][1.8c].
6194 * On Unix, [stack overflow triggers a runtime abort instead of a
6196 * [`Command::spawn` and its equivalents return an error if any of
6197 its command-line arguments contain interior `NUL`s][1.8n].
6198 * [Tuple and unit enum variants from other crates are in the type
6200 * [On Windows `rustc` emits `.lib` files for the `staticlib` library
6201 type instead of `.a` files][1.8st]. Additionally, for the MSVC
6202 toolchain, `rustc` emits import libraries named `foo.dll.lib`
6203 instead of `foo.lib`.
6206 [1.8a]: https://github.com/rust-lang/rust/pull/30962
6207 [1.8b]: https://github.com/rust-lang/rust/pull/31123
6208 [1.8c]: https://github.com/rust-lang/rust/pull/31530
6209 [1.8cc]: https://github.com/rust-lang/cargo/pull/2397
6210 [1.8ce]: https://github.com/rust-lang/cargo/pull/2398
6211 [1.8cf]: https://github.com/rust-lang/rust/pull/31278
6212 [1.8cfg]: https://github.com/rust-lang/cargo/pull/2328
6213 [1.8ci]: https://github.com/rust-lang/cargo/pull/2081
6214 [1.8ck]: https://github.com/rust-lang/cargo/pull/2370
6215 [1.8ct]: https://github.com/rust-lang/cargo/pull/2335
6216 [1.8cu]: https://github.com/rust-lang/rust/pull/31390
6217 [1.8cv]: https://github.com/rust-lang/cargo/issues/2365
6218 [1.8cv]: https://github.com/rust-lang/rust/pull/30998
6219 [1.8h]: https://github.com/rust-lang/rust/pull/31460
6220 [1.8l]: https://github.com/rust-lang/rust/pull/31668
6221 [1.8m]: https://github.com/rust-lang/rust/pull/31020
6222 [1.8mf]: https://github.com/rust-lang/rust/pull/31534
6223 [1.8mp]: https://github.com/rust-lang/rust/pull/30894
6224 [1.8mr]: https://users.rust-lang.org/t/multirust-0-8-with-cross-std-installation/4901
6225 [1.8ms]: https://github.com/rust-lang/rust/pull/30448
6226 [1.8n]: https://github.com/rust-lang/rust/pull/31056
6227 [1.8nx]: https://github.com/rust-lang/rust/pull/30859
6228 [1.8r]: https://github.com/rust-lang/rust/pull/31551
6229 [1.8so]: https://github.com/rust-lang/rust/pull/31333
6230 [1.8st]: https://github.com/rust-lang/rust/pull/29520
6231 [1.8t]: https://github.com/rust-lang/rust/pull/31358
6232 [1.8tn]: https://github.com/rust-lang/rust/pull/30882
6233 [1.8u]: https://github.com/rust-lang/rust/pull/31793
6234 [1.8v]: https://github.com/rust-lang/rust/pull/31757
6235 [1.8w]: https://github.com/rust-lang/rust/pull/31904
6236 [RFC 1361]: https://github.com/rust-lang/rfcs/blob/master/text/1361-cargo-cfg-dependencies.md
6237 [RFC 1415]: https://github.com/rust-lang/rfcs/blob/master/text/1415-trim-std-os.md
6238 [RFC 218]: https://github.com/rust-lang/rfcs/blob/master/text/0218-empty-struct-with-braces.md
6239 [RFC 953]: https://github.com/rust-lang/rfcs/blob/master/text/0953-op-assign.md
6240 [`AddAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.AddAssign.html
6241 [`BitAndAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitAndAssign.html
6242 [`BitOrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitOrAssign.html
6243 [`BitXorAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.BitXorAssign.html
6244 [`DivAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.DivAssign.html
6245 [`Instant::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.duration_since
6246 [`Instant::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.elapsed
6247 [`Instant::now`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html#method.now
6248 [`MulAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.MulAssign.html
6249 [`Ref::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.Ref.html#method.map
6250 [`RefMut::map`]: http://doc.rust-lang.org/nightly/std/cell/struct.RefMut.html#method.map
6251 [`RemAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.RemAssign.html
6252 [`ShlAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShlAssign.html
6253 [`ShrAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.ShrAssign.html
6254 [`SubAssign`]: http://doc.rust-lang.org/nightly/std/ops/trait.SubAssign.html
6255 [`SystemTime::duration_since`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.duration_since
6256 [`SystemTime::elapsed`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.elapsed
6257 [`SystemTime::now`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html#method.now
6258 [`SystemTimeError::duration`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html#method.duration
6259 [`SystemTimeError`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTimeError.html
6260 [`UNIX_EPOCH`]: http://doc.rust-lang.org/nightly/std/time/constant.UNIX_EPOCH.html
6261 [`ptr::drop_in_place`]: http://doc.rust-lang.org/nightly/std/ptr/fn.drop_in_place.html
6262 [`str::EncodeUtf16`]: http://doc.rust-lang.org/nightly/std/str/struct.EncodeUtf16.html
6263 [`str::encode_utf16`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.encode_utf16
6264 [`time::Instant`]: http://doc.rust-lang.org/nightly/std/time/struct.Instant.html
6265 [`time::SystemTime`]: http://doc.rust-lang.org/nightly/std/time/struct.SystemTime.html
6268 Version 1.7.0 (2016-03-03)
6269 ==========================
6276 * [`Path::strip_prefix`] (renamed from relative_from)
6277 * [`path::StripPrefixError`] (new error type returned from strip_prefix)
6279 * [`Ipv4Addr::is_loopback`]
6280 * [`Ipv4Addr::is_private`]
6281 * [`Ipv4Addr::is_link_local`]
6282 * [`Ipv4Addr::is_multicast`]
6283 * [`Ipv4Addr::is_broadcast`]
6284 * [`Ipv4Addr::is_documentation`]
6286 * [`Ipv6Addr::is_unspecified`]
6287 * [`Ipv6Addr::is_loopback`]
6288 * [`Ipv6Addr::is_multicast`]
6291 * [`Vec::as_mut_slice`]
6293 * [`String::as_str`]
6294 * [`String::as_mut_str`]
6296 * `<[T]>::`[`clone_from_slice`], which now requires the two slices to
6298 * `<[T]>::`[`sort_by_key`]
6299 * checked, saturated, and overflowing operations
6300 * [`i32::checked_rem`], [`i32::checked_neg`], [`i32::checked_shl`], [`i32::checked_shr`]
6301 * [`i32::saturating_mul`]
6302 * [`i32::overflowing_add`], [`i32::overflowing_sub`], [`i32::overflowing_mul`], [`i32::overflowing_div`]
6303 * [`i32::overflowing_rem`], [`i32::overflowing_neg`], [`i32::overflowing_shl`], [`i32::overflowing_shr`]
6304 * [`u32::checked_rem`], [`u32::checked_neg`], [`u32::checked_shl`], [`u32::checked_shl`]
6305 * [`u32::saturating_mul`]
6306 * [`u32::overflowing_add`], [`u32::overflowing_sub`], [`u32::overflowing_mul`], [`u32::overflowing_div`]
6307 * [`u32::overflowing_rem`], [`u32::overflowing_neg`], [`u32::overflowing_shl`], [`u32::overflowing_shr`]
6308 * and checked, saturated, and overflowing operations for other primitive types
6310 * [`ffi::IntoStringError`]
6311 * [`CString::into_string`]
6312 * [`CString::into_bytes`]
6313 * [`CString::into_bytes_with_nul`]
6314 * `From<CString> for Vec<u8>`
6316 * [`IntoStringError::into_cstring`]
6317 * [`IntoStringError::utf8_error`]
6318 * `Error for IntoStringError`
6320 * [`std::hash::BuildHasher`]
6321 * [`BuildHasher::Hasher`]
6322 * [`BuildHasher::build_hasher`]
6323 * [`std::hash::BuildHasherDefault`]
6324 * [`HashMap::with_hasher`]
6325 * [`HashMap::with_capacity_and_hasher`]
6326 * [`HashSet::with_hasher`]
6327 * [`HashSet::with_capacity_and_hasher`]
6328 * [`std::collections::hash_map::RandomState`]
6329 * [`RandomState::new`]
6330 * [Validating UTF-8 is faster by a factor of between 7 and 14x for
6331 ASCII input][1.7utf8]. This means that creating `String`s and `str`s
6332 from bytes is faster.
6333 * [The performance of `LineWriter` (and thus `io::stdout`) was
6334 improved by using `memchr` to search for newlines][1.7m].
6335 * [`f32::to_degrees` and `f32::to_radians` are stable][1.7f]. The
6336 `f64` variants were stabilized previously.
6337 * [`BTreeMap` was rewritten to use less memory and improve the performance
6338 of insertion and iteration, the latter by as much as 5x][1.7bm].
6339 * [`BTreeSet` and its iterators, `Iter`, `IntoIter`, and `Range` are
6340 covariant over their contained type][1.7bt].
6341 * [`LinkedList` and its iterators, `Iter` and `IntoIter` are covariant
6342 over their contained type][1.7ll].
6343 * [`str::replace` now accepts a `Pattern`][1.7rp], like other string
6345 * [`Any` is implemented for unsized types][1.7a].
6346 * [`Hash` is implemented for `Duration`][1.7h].
6351 * [When running tests with `--test`, rustdoc will pass `--cfg`
6352 arguments to the compiler][1.7dt].
6353 * [The compiler is built with RPATH information by default][1.7rpa].
6354 This means that it will be possible to run `rustc` when installed in
6355 unusual configurations without configuring the dynamic linker search
6357 * [`rustc` passes `--enable-new-dtags` to GNU ld][1.7dta]. This makes
6358 any RPATH entries (emitted with `-C rpath`) *not* take precedence
6359 over `LD_LIBRARY_PATH`.
6364 * [`cargo rustc` accepts a `--profile` flag that runs `rustc` under
6365 any of the compilation profiles, 'dev', 'bench', or 'test'][1.7cp].
6366 * [The `rerun-if-changed` build script directive no longer causes the
6367 build script to incorrectly run twice in certain scenarios][1.7rr].
6372 * Soundness fixes to the interactions between associated types and
6373 lifetimes, specified in [RFC 1214], [now generate errors][1.7sf] for
6374 code that violates the new rules. This is a significant change that
6375 is known to break existing code, so it has emitted warnings for the
6376 new error cases since 1.4 to give crate authors time to adapt. The
6377 details of what is changing are subtle; read the RFC for more.
6378 * [Several bugs in the compiler's visibility calculations were
6379 fixed][1.7v]. Since this was found to break significant amounts of
6380 code, the new errors will be emitted as warnings for several release
6381 cycles, under the `private_in_public` lint.
6382 * Defaulted type parameters were accidentally accepted in positions
6383 that were not intended. In this release, [defaulted type parameters
6384 appearing outside of type definitions will generate a
6385 warning][1.7d], which will become an error in future releases.
6386 * [Parsing "." as a float results in an error instead of 0][1.7p].
6387 That is, `".".parse::<f32>()` returns `Err`, not `Ok(0.0)`.
6388 * [Borrows of closure parameters may not outlive the closure][1.7bc].
6390 [1.7a]: https://github.com/rust-lang/rust/pull/30928
6391 [1.7bc]: https://github.com/rust-lang/rust/pull/30341
6392 [1.7bm]: https://github.com/rust-lang/rust/pull/30426
6393 [1.7bt]: https://github.com/rust-lang/rust/pull/30998
6394 [1.7cp]: https://github.com/rust-lang/cargo/pull/2224
6395 [1.7d]: https://github.com/rust-lang/rust/pull/30724
6396 [1.7dt]: https://github.com/rust-lang/rust/pull/30372
6397 [1.7dta]: https://github.com/rust-lang/rust/pull/30394
6398 [1.7f]: https://github.com/rust-lang/rust/pull/30672
6399 [1.7h]: https://github.com/rust-lang/rust/pull/30818
6400 [1.7ll]: https://github.com/rust-lang/rust/pull/30663
6401 [1.7m]: https://github.com/rust-lang/rust/pull/30381
6402 [1.7p]: https://github.com/rust-lang/rust/pull/30681
6403 [1.7rp]: https://github.com/rust-lang/rust/pull/29498
6404 [1.7rpa]: https://github.com/rust-lang/rust/pull/30353
6405 [1.7rr]: https://github.com/rust-lang/cargo/pull/2279
6406 [1.7sf]: https://github.com/rust-lang/rust/pull/30389
6407 [1.7utf8]: https://github.com/rust-lang/rust/pull/30740
6408 [1.7v]: https://github.com/rust-lang/rust/pull/29973
6409 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6410 [`BuildHasher::Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
6411 [`BuildHasher::build_hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html#tymethod.build_hasher
6412 [`CString::into_bytes_with_nul`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes_with_nul
6413 [`CString::into_bytes`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_bytes
6414 [`CString::into_string`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_string
6415 [`HashMap::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_capacity_and_hasher
6416 [`HashMap::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashMap.html#method.with_hasher
6417 [`HashSet::with_capacity_and_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_capacity_and_hasher
6418 [`HashSet::with_hasher`]: http://doc.rust-lang.org/nightly/std/collections/struct.HashSet.html#method.with_hasher
6419 [`IntoStringError::into_cstring`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.into_cstring
6420 [`IntoStringError::utf8_error`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html#method.utf8_error
6421 [`Ipv4Addr::is_broadcast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_broadcast
6422 [`Ipv4Addr::is_documentation`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_documentation
6423 [`Ipv4Addr::is_link_local`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_link_local
6424 [`Ipv4Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_loopback
6425 [`Ipv4Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_multicast
6426 [`Ipv4Addr::is_private`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv4Addr.html#method.is_private
6427 [`Ipv6Addr::is_loopback`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_loopback
6428 [`Ipv6Addr::is_multicast`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_multicast
6429 [`Ipv6Addr::is_unspecified`]: http://doc.rust-lang.org/nightly/std/net/struct.Ipv6Addr.html#method.is_unspecified
6430 [`Path::strip_prefix`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.strip_prefix
6431 [`RandomState::new`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html#method.new
6432 [`String::as_mut_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_mut_str
6433 [`String::as_str`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.as_str
6434 [`Vec::as_mut_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_mut_slice
6435 [`Vec::as_slice`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.as_slice
6436 [`clone_from_slice`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice
6437 [`ffi::IntoStringError`]: http://doc.rust-lang.org/nightly/std/ffi/struct.IntoStringError.html
6438 [`i32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_neg
6439 [`i32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_rem
6440 [`i32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shl
6441 [`i32::checked_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.checked_shr
6442 [`i32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_add
6443 [`i32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_div
6444 [`i32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_mul
6445 [`i32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_neg
6446 [`i32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_rem
6447 [`i32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shl
6448 [`i32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_shr
6449 [`i32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.overflowing_sub
6450 [`i32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.i32.html#method.saturating_mul
6451 [`path::StripPrefixError`]: http://doc.rust-lang.org/nightly/std/path/struct.StripPrefixError.html
6452 [`sort_by_key`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key
6453 [`std::collections::hash_map::RandomState`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.RandomState.html
6454 [`std::hash::BuildHasherDefault`]: http://doc.rust-lang.org/nightly/std/hash/struct.BuildHasherDefault.html
6455 [`std::hash::BuildHasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.BuildHasher.html
6456 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6457 [`u32::checked_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_rem
6458 [`u32::checked_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_neg
6459 [`u32::checked_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.checked_shl
6460 [`u32::overflowing_add`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_add
6461 [`u32::overflowing_div`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_div
6462 [`u32::overflowing_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_mul
6463 [`u32::overflowing_neg`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_neg
6464 [`u32::overflowing_rem`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_rem
6465 [`u32::overflowing_shl`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shl
6466 [`u32::overflowing_shr`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_shr
6467 [`u32::overflowing_sub`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.overflowing_sub
6468 [`u32::saturating_mul`]: http://doc.rust-lang.org/nightly/std/primitive.u32.html#method.saturating_mul
6471 Version 1.6.0 (2016-01-21)
6472 ==========================
6477 * The `#![no_std]` attribute causes a crate to not be linked to the
6478 standard library, but only the [core library][1.6co], as described
6479 in [RFC 1184]. The core library defines common types and traits but
6480 has no platform dependencies whatsoever, and is the basis for Rust
6481 software in environments that cannot support a full port of the
6482 standard library, such as operating systems. Most of the core
6483 library is now stable.
6489 [`Read::read_exact`],
6490 [`ErrorKind::UnexpectedEof`] (renamed from `UnexpectedEOF`),
6491 [`fs::DirBuilder`], [`fs::DirBuilder::new`],
6492 [`fs::DirBuilder::recursive`], [`fs::DirBuilder::create`],
6493 [`os::unix::fs::DirBuilderExt`],
6494 [`os::unix::fs::DirBuilderExt::mode`], [`vec::Drain`],
6495 [`vec::Vec::drain`], [`string::Drain`], [`string::String::drain`],
6496 [`vec_deque::Drain`], [`vec_deque::VecDeque::drain`],
6497 [`collections::hash_map::Drain`],
6498 [`collections::hash_map::HashMap::drain`],
6499 [`collections::hash_set::Drain`],
6500 [`collections::hash_set::HashSet::drain`],
6501 [`collections::binary_heap::Drain`],
6502 [`collections::binary_heap::BinaryHeap::drain`],
6503 [`Vec::extend_from_slice`] (renamed from `push_all`),
6504 [`Mutex::get_mut`], [`Mutex::into_inner`], [`RwLock::get_mut`],
6505 [`RwLock::into_inner`],
6506 [`Iterator::min_by_key`] (renamed from `min_by`),
6507 [`Iterator::max_by_key`] (renamed from `max_by`).
6508 * The [core library][1.6co] is stable, as are most of its APIs.
6509 * [The `assert_eq!` macro supports arguments that don't implement
6510 `Sized`][1.6ae], such as arrays. In this way it behaves more like
6512 * Several timer functions that take duration in milliseconds [are
6513 deprecated in favor of those that take `Duration`][1.6ms]. These
6514 include `Condvar::wait_timeout_ms`, `thread::sleep_ms`, and
6515 `thread::park_timeout_ms`.
6516 * The algorithm by which `Vec` reserves additional elements was
6517 [tweaked to not allocate excessive space][1.6a] while still growing
6519 * `From` conversions are [implemented from integers to floats][1.6f]
6520 in cases where the conversion is lossless. Thus they are not
6521 implemented for 32-bit ints to `f32`, nor for 64-bit ints to `f32`
6522 or `f64`. They are also not implemented for `isize` and `usize`
6523 because the implementations would be platform-specific. `From` is
6524 also implemented from `f32` to `f64`.
6525 * `From<&Path>` and `From<PathBuf>` are implemented for `Cow<Path>`.
6526 * `From<T>` is implemented for `Box<T>`, `Rc<T>` and `Arc<T>`.
6527 * `IntoIterator` is implemented for `&PathBuf` and `&Path`.
6528 * [`BinaryHeap` was refactored][1.6bh] for modest performance
6530 * Sorting slices that are already sorted [is 50% faster in some
6536 * Cargo will look in `$CARGO_HOME/bin` for subcommands [by default][1.6c].
6537 * Cargo build scripts can specify their dependencies by emitting the
6538 [`rerun-if-changed`][1.6rr] key.
6539 * crates.io will reject publication of crates with dependencies that
6540 have a wildcard version constraint. Crates with wildcard
6541 dependencies were seen to cause a variety of problems, as described
6542 in [RFC 1241]. Since 1.5 publication of such crates has emitted a
6544 * `cargo clean` [accepts a `--release` flag][1.6cc] to clean the
6545 release folder. A variety of artifacts that Cargo failed to clean
6546 are now correctly deleted.
6551 * The `unreachable_code` lint [warns when a function call's argument
6553 * The parser indicates [failures that may be caused by
6554 confusingly-similar Unicode characters][1.6uc]
6555 * Certain macro errors [are reported at definition time][1.6m], not
6561 * The compiler no longer makes use of the [`RUST_PATH`][1.6rp]
6562 environment variable when locating crates. This was a pre-cargo
6563 feature for integrating with the package manager that was
6564 accidentally never removed.
6565 * [A number of bugs were fixed in the privacy checker][1.6p] that
6566 could cause previously-accepted code to break.
6567 * [Modules and unit/tuple structs may not share the same name][1.6ts].
6568 * [Bugs in pattern matching unit structs were fixed][1.6us]. The tuple
6569 struct pattern syntax (`Foo(..)`) can no longer be used to match
6570 unit structs. This is a warning now, but will become an error in
6571 future releases. Patterns that share the same name as a const are
6573 * A bug was fixed that causes [rustc not to apply default type
6574 parameters][1.6xc] when resolving certain method implementations of
6575 traits defined in other crates.
6577 [1.6a]: https://github.com/rust-lang/rust/pull/29454
6578 [1.6ae]: https://github.com/rust-lang/rust/pull/29770
6579 [1.6bh]: https://github.com/rust-lang/rust/pull/29811
6580 [1.6c]: https://github.com/rust-lang/cargo/pull/2192
6581 [1.6cc]: https://github.com/rust-lang/cargo/pull/2131
6582 [1.6co]: http://doc.rust-lang.org/core/index.html
6583 [1.6dv]: https://github.com/rust-lang/rust/pull/30000
6584 [1.6f]: https://github.com/rust-lang/rust/pull/29129
6585 [1.6m]: https://github.com/rust-lang/rust/pull/29828
6586 [1.6ms]: https://github.com/rust-lang/rust/pull/29604
6587 [1.6p]: https://github.com/rust-lang/rust/pull/29726
6588 [1.6rp]: https://github.com/rust-lang/rust/pull/30034
6589 [1.6rr]: https://github.com/rust-lang/cargo/pull/2134
6590 [1.6s]: https://github.com/rust-lang/rust/pull/29675
6591 [1.6ts]: https://github.com/rust-lang/rust/issues/21546
6592 [1.6uc]: https://github.com/rust-lang/rust/pull/29837
6593 [1.6us]: https://github.com/rust-lang/rust/pull/29383
6594 [1.6xc]: https://github.com/rust-lang/rust/issues/30123
6595 [RFC 1184]: https://github.com/rust-lang/rfcs/blob/master/text/1184-stabilize-no_std.md
6596 [RFC 1241]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6597 [`ErrorKind::UnexpectedEof`]: http://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html#variant.UnexpectedEof
6598 [`Iterator::max_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.max_by_key
6599 [`Iterator::min_by_key`]: http://doc.rust-lang.org/nightly/std/iter/trait.Iterator.html#method.min_by_key
6600 [`Mutex::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.get_mut
6601 [`Mutex::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html#method.into_inner
6602 [`Read::read_exact`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_exact
6603 [`RwLock::get_mut`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.get_mut
6604 [`RwLock::into_inner`]: http://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html#method.into_inner
6605 [`Vec::extend_from_slice`]: http://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html#method.extend_from_slice
6606 [`collections::binary_heap::BinaryHeap::drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.BinaryHeap.html#method.drain
6607 [`collections::binary_heap::Drain`]: http://doc.rust-lang.org/nightly/std/collections/binary_heap/struct.Drain.html
6608 [`collections::hash_map::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.Drain.html
6609 [`collections::hash_map::HashMap::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_map/struct.HashMap.html#method.drain
6610 [`collections::hash_set::Drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.Drain.html
6611 [`collections::hash_set::HashSet::drain`]: http://doc.rust-lang.org/nightly/std/collections/hash_set/struct.HashSet.html#method.drain
6612 [`fs::DirBuilder::create`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.create
6613 [`fs::DirBuilder::new`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.new
6614 [`fs::DirBuilder::recursive`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html#method.recursive
6615 [`fs::DirBuilder`]: http://doc.rust-lang.org/nightly/std/fs/struct.DirBuilder.html
6616 [`os::unix::fs::DirBuilderExt::mode`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html#tymethod.mode
6617 [`os::unix::fs::DirBuilderExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.DirBuilderExt.html
6618 [`string::Drain`]: http://doc.rust-lang.org/nightly/std/string/struct.Drain.html
6619 [`string::String::drain`]: http://doc.rust-lang.org/nightly/std/string/struct.String.html#method.drain
6620 [`vec::Drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Drain.html
6621 [`vec::Vec::drain`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.drain
6622 [`vec_deque::Drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.Drain.html
6623 [`vec_deque::VecDeque::drain`]: http://doc.rust-lang.org/nightly/std/collections/vec_deque/struct.VecDeque.html#method.drain
6626 Version 1.5.0 (2015-12-10)
6627 ==========================
6629 * ~700 changes, numerous bugfixes
6635 [`BinaryHeap::from`], [`BinaryHeap::into_sorted_vec`],
6636 [`BinaryHeap::into_vec`], [`Condvar::wait_timeout`],
6637 [`FileTypeExt::is_block_device`], [`FileTypeExt::is_char_device`],
6638 [`FileTypeExt::is_fifo`], [`FileTypeExt::is_socket`],
6639 [`FileTypeExt`], [`Formatter::alternate`], [`Formatter::fill`],
6640 [`Formatter::precision`], [`Formatter::sign_aware_zero_pad`],
6641 [`Formatter::sign_minus`], [`Formatter::sign_plus`],
6642 [`Formatter::width`], [`Iterator::cmp`], [`Iterator::eq`],
6643 [`Iterator::ge`], [`Iterator::gt`], [`Iterator::le`],
6644 [`Iterator::lt`], [`Iterator::ne`], [`Iterator::partial_cmp`],
6645 [`Path::canonicalize`], [`Path::exists`], [`Path::is_dir`],
6646 [`Path::is_file`], [`Path::metadata`], [`Path::read_dir`],
6647 [`Path::read_link`], [`Path::symlink_metadata`],
6648 [`Utf8Error::valid_up_to`], [`Vec::resize`],
6649 [`VecDeque::as_mut_slices`], [`VecDeque::as_slices`],
6650 [`VecDeque::insert`], [`VecDeque::shrink_to_fit`],
6651 [`VecDeque::swap_remove_back`], [`VecDeque::swap_remove_front`],
6652 [`slice::split_first_mut`], [`slice::split_first`],
6653 [`slice::split_last_mut`], [`slice::split_last`],
6654 [`char::from_u32_unchecked`], [`fs::canonicalize`],
6655 [`str::MatchIndices`], [`str::RMatchIndices`],
6656 [`str::match_indices`], [`str::rmatch_indices`],
6657 [`str::slice_mut_unchecked`], [`string::ParseError`].
6658 * Rust applications hosted on crates.io can be installed locally to
6659 `~/.cargo/bin` with the [`cargo install`] command. Among other
6660 things this makes it easier to augment Cargo with new subcommands:
6661 when a binary named e.g. `cargo-foo` is found in `$PATH` it can be
6662 invoked as `cargo foo`.
6663 * Crates with wildcard (`*`) dependencies will [emit warnings when
6664 published][1.5w]. In 1.6 it will no longer be possible to publish
6665 crates with wildcard dependencies.
6670 * The rules determining when a particular lifetime must outlive
6671 a particular value (known as '[dropck]') have been [modified
6672 to not rely on parametricity][1.5p].
6673 * [Implementations of `AsRef` and `AsMut` were added to `Box`, `Rc`,
6674 and `Arc`][1.5a]. Because these smart pointer types implement
6675 `Deref`, this causes breakage in cases where the interior type
6676 contains methods of the same name.
6677 * [Correct a bug in Rc/Arc][1.5c] that caused [dropck] to be unaware
6678 that they could drop their content. Soundness fix.
6679 * All method invocations are [properly checked][1.5wf1] for
6680 [well-formedness][1.5wf2]. Soundness fix.
6681 * Traits whose supertraits contain `Self` are [not object
6682 safe][1.5o]. Soundness fix.
6683 * Target specifications support a [`no_default_libraries`][1.5nd]
6684 setting that controls whether `-nodefaultlibs` is passed to the
6685 linker, and in turn the `is_like_windows` setting no longer affects
6686 the `-nodefaultlibs` flag.
6687 * `#[derive(Show)]`, long-deprecated, [has been removed][1.5ds].
6688 * The `#[inline]` and `#[repr]` attributes [can only appear
6689 in valid locations][1.5at].
6690 * Native libraries linked from the local crate are [passed to
6691 the linker before native libraries from upstream crates][1.5nl].
6692 * Two rarely-used attributes, `#[no_debug]` and
6693 `#[omit_gdb_pretty_printer_section]` [are feature gated][1.5fg].
6694 * Negation of unsigned integers, which has been a warning for
6695 several releases, [is now behind a feature gate and will
6696 generate errors][1.5nu].
6697 * The parser accidentally accepted visibility modifiers on
6698 enum variants, a bug [which has been fixed][1.5ev].
6699 * [A bug was fixed that allowed `use` statements to import unstable
6705 * When evaluating expressions at compile-time that are not
6706 compile-time constants (const-evaluating expressions in non-const
6707 contexts), incorrect code such as overlong bitshifts and arithmetic
6708 overflow will [generate a warning instead of an error][1.5ce],
6709 delaying the error until runtime. This will allow the
6710 const-evaluator to be expanded in the future backwards-compatibly.
6711 * The `improper_ctypes` lint [no longer warns about using `isize` and
6712 `usize` in FFI][1.5ict].
6717 * `Arc<T>` and `Rc<T>` are [covariant with respect to `T` instead of
6719 * `Default` is [implemented for mutable slices][1.5d].
6720 * `FromStr` is [implemented for `SockAddrV4` and `SockAddrV6`][1.5s].
6721 * There are now `From` conversions [between floating point
6722 types][1.5f] where the conversions are lossless.
6723 * There are now `From` conversions [between integer types][1.5i] where
6724 the conversions are lossless.
6725 * [`fs::Metadata` implements `Clone`][1.5fs].
6726 * The `parse` method [accepts a leading "+" when parsing
6728 * [`AsMut` is implemented for `Vec`][1.5am].
6729 * The `clone_from` implementations for `String` and `BinaryHeap` [have
6730 been optimized][1.5cf] and no longer rely on the default impl.
6731 * The `extern "Rust"`, `extern "C"`, `unsafe extern "Rust"` and
6732 `unsafe extern "C"` function types now [implement `Clone`,
6733 `PartialEq`, `Eq`, `PartialOrd`, `Ord`, `Hash`, `fmt::Pointer`, and
6734 `fmt::Debug` for up to 12 arguments][1.5fp].
6735 * [Dropping `Vec`s is much faster in unoptimized builds when the
6736 element types don't implement `Drop`][1.5dv].
6737 * A bug that caused in incorrect behavior when [combining `VecDeque`
6738 with zero-sized types][1.5vdz] was resolved.
6739 * [`PartialOrd` for slices is faster][1.5po].
6744 * [Crate metadata size was reduced by 20%][1.5md].
6745 * [Improvements to code generation reduced the size of libcore by 3.3
6746 MB and rustc's memory usage by 18MB][1.5m].
6747 * [Improvements to deref translation increased performance in
6748 unoptimized builds][1.5dr].
6749 * Various errors in trait resolution [are deduplicated to only be
6750 reported once][1.5te].
6751 * Rust has preliminary [support for rumprun kernels][1.5rr].
6752 * Rust has preliminary [support for NetBSD on amd64][1.5na].
6754 [1.5use]: https://github.com/rust-lang/rust/pull/28364
6755 [1.5po]: https://github.com/rust-lang/rust/pull/28436
6756 [1.5ev]: https://github.com/rust-lang/rust/pull/28442
6757 [1.5nu]: https://github.com/rust-lang/rust/pull/28468
6758 [1.5dr]: https://github.com/rust-lang/rust/pull/28491
6759 [1.5vdz]: https://github.com/rust-lang/rust/pull/28494
6760 [1.5md]: https://github.com/rust-lang/rust/pull/28521
6761 [1.5fg]: https://github.com/rust-lang/rust/pull/28522
6762 [1.5dv]: https://github.com/rust-lang/rust/pull/28531
6763 [1.5na]: https://github.com/rust-lang/rust/pull/28543
6764 [1.5fp]: https://github.com/rust-lang/rust/pull/28560
6765 [1.5rr]: https://github.com/rust-lang/rust/pull/28593
6766 [1.5cf]: https://github.com/rust-lang/rust/pull/28602
6767 [1.5nl]: https://github.com/rust-lang/rust/pull/28605
6768 [1.5te]: https://github.com/rust-lang/rust/pull/28645
6769 [1.5at]: https://github.com/rust-lang/rust/pull/28650
6770 [1.5am]: https://github.com/rust-lang/rust/pull/28663
6771 [1.5m]: https://github.com/rust-lang/rust/pull/28778
6772 [1.5ict]: https://github.com/rust-lang/rust/pull/28779
6773 [1.5a]: https://github.com/rust-lang/rust/pull/28811
6774 [1.5pi]: https://github.com/rust-lang/rust/pull/28826
6775 [1.5ce]: https://github.com/rust-lang/rfcs/blob/master/text/1229-compile-time-asserts.md
6776 [1.5p]: https://github.com/rust-lang/rfcs/blob/master/text/1238-nonparametric-dropck.md
6777 [1.5i]: https://github.com/rust-lang/rust/pull/28921
6778 [1.5fs]: https://github.com/rust-lang/rust/pull/29021
6779 [1.5f]: https://github.com/rust-lang/rust/pull/29129
6780 [1.5ds]: https://github.com/rust-lang/rust/pull/29148
6781 [1.5s]: https://github.com/rust-lang/rust/pull/29190
6782 [1.5d]: https://github.com/rust-lang/rust/pull/29245
6783 [1.5o]: https://github.com/rust-lang/rust/pull/29259
6784 [1.5nd]: https://github.com/rust-lang/rust/pull/28578
6785 [1.5wf2]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
6786 [1.5wf1]: https://github.com/rust-lang/rust/pull/28669
6787 [dropck]: https://doc.rust-lang.org/nightly/nomicon/dropck.html
6788 [1.5c]: https://github.com/rust-lang/rust/pull/29110
6789 [1.5w]: https://github.com/rust-lang/rfcs/blob/master/text/1241-no-wildcard-deps.md
6790 [`cargo install`]: https://github.com/rust-lang/rfcs/blob/master/text/1200-cargo-install.md
6791 [`BinaryHeap::from`]: http://doc.rust-lang.org/nightly/std/convert/trait.From.html#method.from
6792 [`BinaryHeap::into_sorted_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_sorted_vec
6793 [`BinaryHeap::into_vec`]: http://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html#method.into_vec
6794 [`Condvar::wait_timeout`]: http://doc.rust-lang.org/nightly/std/sync/struct.Condvar.html#method.wait_timeout
6795 [`FileTypeExt::is_block_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_block_device
6796 [`FileTypeExt::is_char_device`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_char_device
6797 [`FileTypeExt::is_fifo`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_fifo
6798 [`FileTypeExt::is_socket`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html#tymethod.is_socket
6799 [`FileTypeExt`]: http://doc.rust-lang.org/nightly/std/os/unix/fs/trait.FileTypeExt.html
6800 [`Formatter::alternate`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.alternate
6801 [`Formatter::fill`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.fill
6802 [`Formatter::precision`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.precision
6803 [`Formatter::sign_aware_zero_pad`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_aware_zero_pad
6804 [`Formatter::sign_minus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_minus
6805 [`Formatter::sign_plus`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.sign_plus
6806 [`Formatter::width`]: http://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.width
6807 [`Iterator::cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.cmp
6808 [`Iterator::eq`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.eq
6809 [`Iterator::ge`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ge
6810 [`Iterator::gt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.gt
6811 [`Iterator::le`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.le
6812 [`Iterator::lt`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.lt
6813 [`Iterator::ne`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.ne
6814 [`Iterator::partial_cmp`]: http://doc.rust-lang.org/nightly/core/iter/trait.Iterator.html#method.partial_cmp
6815 [`Path::canonicalize`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.canonicalize
6816 [`Path::exists`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.exists
6817 [`Path::is_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_dir
6818 [`Path::is_file`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.is_file
6819 [`Path::metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.metadata
6820 [`Path::read_dir`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_dir
6821 [`Path::read_link`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.read_link
6822 [`Path::symlink_metadata`]: http://doc.rust-lang.org/nightly/std/path/struct.Path.html#method.symlink_metadata
6823 [`Utf8Error::valid_up_to`]: http://doc.rust-lang.org/nightly/core/str/struct.Utf8Error.html#method.valid_up_to
6824 [`Vec::resize`]: http://doc.rust-lang.org/nightly/std/vec/struct.Vec.html#method.resize
6825 [`VecDeque::as_mut_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_mut_slices
6826 [`VecDeque::as_slices`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.as_slices
6827 [`VecDeque::insert`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.insert
6828 [`VecDeque::shrink_to_fit`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.shrink_to_fit
6829 [`VecDeque::swap_remove_back`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_back
6830 [`VecDeque::swap_remove_front`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.swap_remove_front
6831 [`slice::split_first_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first_mut
6832 [`slice::split_first`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_first
6833 [`slice::split_last_mut`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last_mut
6834 [`slice::split_last`]: http://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_last
6835 [`char::from_u32_unchecked`]: http://doc.rust-lang.org/nightly/std/char/fn.from_u32_unchecked.html
6836 [`fs::canonicalize`]: http://doc.rust-lang.org/nightly/std/fs/fn.canonicalize.html
6837 [`str::MatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.MatchIndices.html
6838 [`str::RMatchIndices`]: http://doc.rust-lang.org/nightly/std/str/struct.RMatchIndices.html
6839 [`str::match_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.match_indices
6840 [`str::rmatch_indices`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatch_indices
6841 [`str::slice_mut_unchecked`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.slice_mut_unchecked
6842 [`string::ParseError`]: http://doc.rust-lang.org/nightly/std/string/enum.ParseError.html
6844 Version 1.4.0 (2015-10-29)
6845 ==========================
6847 * ~1200 changes, numerous bugfixes
6852 * Windows builds targeting the 64-bit MSVC ABI and linker (instead of
6853 GNU) are now supported and recommended for use.
6858 * [Several changes have been made to fix type soundness and improve
6859 the behavior of associated types][sound]. See [RFC 1214]. Although
6860 we have mostly introduced these changes as warnings this release, to
6861 become errors next release, there are still some scenarios that will
6862 see immediate breakage.
6863 * [The `str::lines` and `BufRead::lines` iterators treat `\r\n` as
6864 line breaks in addition to `\n`][crlf].
6865 * [Loans of `'static` lifetime extend to the end of a function][stat].
6866 * [`str::parse` no longer introduces avoidable rounding error when
6867 parsing floating point numbers. Together with earlier changes to
6868 float formatting/output, "round trips" like f.to_string().parse()
6869 now preserve the value of f exactly. Additionally, leading plus
6870 signs are now accepted][fp3].
6876 * `use` statements that import multiple items [can now rename
6877 them][i], as in `use foo::{bar as kitten, baz as puppy}`.
6878 * [Binops work correctly on fat pointers][binfat].
6879 * `pub extern crate`, which does not behave as expected, [issues a
6880 warning][pec] until a better solution is found.
6885 * [Many APIs were stabilized][stab]: `<Box<str>>::into_string`,
6886 [`Arc::downgrade`], [`Arc::get_mut`], [`Arc::make_mut`],
6887 [`Arc::try_unwrap`], [`Box::from_raw`], [`Box::into_raw`], [`CStr::to_str`],
6888 [`CStr::to_string_lossy`], [`CString::from_raw`], [`CString::into_raw`],
6889 [`IntoRawFd::into_raw_fd`], [`IntoRawFd`],
6890 `IntoRawHandle::into_raw_handle`, `IntoRawHandle`,
6891 `IntoRawSocket::into_raw_socket`, `IntoRawSocket`, [`Rc::downgrade`],
6892 [`Rc::get_mut`], [`Rc::make_mut`], [`Rc::try_unwrap`], [`Result::expect`],
6893 [`String::into_boxed_str`], [`TcpStream::read_timeout`],
6894 [`TcpStream::set_read_timeout`], [`TcpStream::set_write_timeout`],
6895 [`TcpStream::write_timeout`], [`UdpSocket::read_timeout`],
6896 [`UdpSocket::set_read_timeout`], [`UdpSocket::set_write_timeout`],
6897 [`UdpSocket::write_timeout`], `Vec::append`, `Vec::split_off`,
6898 [`VecDeque::append`], [`VecDeque::retain`], [`VecDeque::split_off`],
6899 [`rc::Weak::upgrade`], [`rc::Weak`], [`slice::Iter::as_slice`],
6900 [`slice::IterMut::into_slice`], [`str::CharIndices::as_str`],
6901 [`str::Chars::as_str`], [`str::split_at_mut`], [`str::split_at`],
6902 [`sync::Weak::upgrade`], [`sync::Weak`], [`thread::park_timeout`],
6904 * [Some APIs were deprecated][dep]: `BTreeMap::with_b`,
6905 `BTreeSet::with_b`, `Option::as_mut_slice`, `Option::as_slice`,
6906 `Result::as_mut_slice`, `Result::as_slice`, `f32::from_str_radix`,
6907 `f64::from_str_radix`.
6908 * [Reverse-searching strings is faster with the 'two-way'
6910 * [`std::io::copy` allows `?Sized` arguments][cc].
6911 * The `Windows`, `Chunks`, and `ChunksMut` iterators over slices all
6912 [override `count`, `nth` and `last` with an O(1)
6913 implementation][it].
6914 * [`Default` is implemented for arrays up to `[T; 32]`][d].
6915 * [`IntoRawFd` has been added to the Unix-specific prelude,
6916 `IntoRawSocket` and `IntoRawHandle` to the Windows-specific
6918 * [`Extend<String>` and `FromIterator<String` are both implemented for
6920 * [`IntoIterator` is implemented for references to `Option` and
6922 * [`HashMap` and `HashSet` implement `Extend<&T>` where `T:
6923 Copy`][ext] as part of [RFC 839]. This will cause type inference
6924 breakage in rare situations.
6925 * [`BinaryHeap` implements `Debug`][bh2].
6926 * [`Borrow` and `BorrowMut` are implemented for fixed-size
6928 * [`extern fn`s with the "Rust" and "C" ABIs implement common
6929 traits including `Eq`, `Ord`, `Debug`, `Hash`][fp].
6930 * [String comparison is faster][faststr].
6931 * `&mut T` where `T: std::fmt::Write` [also implements
6932 `std::fmt::Write`][mutw].
6933 * [A stable regression in `VecDeque::push_back` and other
6934 capacity-altering methods that caused panics for zero-sized types
6936 * [Function pointers implement traits for up to 12 parameters][fp2].
6941 * The compiler [no longer uses the 'morestack' feature to prevent
6942 stack overflow][mm]. Instead it uses guard pages and stack
6943 probes (though stack probes are not yet implemented on any platform
6945 * [The compiler matches traits faster when projections are involved][p].
6946 * The 'improper_ctypes' lint [no longer warns about use of `isize` and
6948 * [Cargo now displays useful information about what its doing during
6949 `cargo update`][cu].
6951 [`Arc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.downgrade
6952 [`Arc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.make_mut
6953 [`Arc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.get_mut
6954 [`Arc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/arc/struct.Arc.html#method.try_unwrap
6955 [`Box::from_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.from_raw
6956 [`Box::into_raw`]: http://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html#method.into_raw
6957 [`CStr::to_str`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_str
6958 [`CStr::to_string_lossy`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html#method.to_string_lossy
6959 [`CString::from_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.from_raw
6960 [`CString::into_raw`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html#method.into_raw
6961 [`IntoRawFd::into_raw_fd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html#tymethod.into_raw_fd
6962 [`IntoRawFd`]: http://doc.rust-lang.org/nightly/std/os/unix/io/trait.IntoRawFd.html
6963 [`Rc::downgrade`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.downgrade
6964 [`Rc::get_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.get_mut
6965 [`Rc::make_mut`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.make_mut
6966 [`Rc::try_unwrap`]: http://doc.rust-lang.org/nightly/alloc/rc/struct.Rc.html#method.try_unwrap
6967 [`Result::expect`]: http://doc.rust-lang.org/nightly/core/result/enum.Result.html#method.expect
6968 [`String::into_boxed_str`]: http://doc.rust-lang.org/nightly/collections/string/struct.String.html#method.into_boxed_str
6969 [`TcpStream::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6970 [`TcpStream::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6971 [`TcpStream::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6972 [`TcpStream::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6973 [`UdpSocket::read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.read_timeout
6974 [`UdpSocket::set_read_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_read_timeout
6975 [`UdpSocket::write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.write_timeout
6976 [`UdpSocket::set_write_timeout`]: http://doc.rust-lang.org/nightly/std/net/struct.TcpStream.html#method.set_write_timeout
6977 [`VecDeque::append`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.append
6978 [`VecDeque::retain`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.retain
6979 [`VecDeque::split_off`]: http://doc.rust-lang.org/nightly/std/collections/struct.VecDeque.html#method.split_off
6980 [`rc::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html#method.upgrade
6981 [`rc::Weak`]: http://doc.rust-lang.org/nightly/std/rc/struct.Weak.html
6982 [`slice::Iter::as_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#method.as_slice
6983 [`slice::IterMut::into_slice`]: http://doc.rust-lang.org/nightly/std/slice/struct.IterMut.html#method.into_slice
6984 [`str::CharIndices::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.CharIndices.html#method.as_str
6985 [`str::Chars::as_str`]: http://doc.rust-lang.org/nightly/std/str/struct.Chars.html#method.as_str
6986 [`str::split_at_mut`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at_mut
6987 [`str::split_at`]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_at
6988 [`sync::Weak::upgrade`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html#method.upgrade
6989 [`sync::Weak`]: http://doc.rust-lang.org/nightly/std/sync/struct.Weak.html
6990 [`thread::park_timeout`]: http://doc.rust-lang.org/nightly/std/thread/fn.park_timeout.html
6991 [`thread::sleep`]: http://doc.rust-lang.org/nightly/std/thread/fn.sleep.html
6992 [bh2]: https://github.com/rust-lang/rust/pull/28156
6993 [binfat]: https://github.com/rust-lang/rust/pull/28270
6994 [bm]: https://github.com/rust-lang/rust/pull/28197
6995 [cc]: https://github.com/rust-lang/rust/pull/27531
6996 [crlf]: https://github.com/rust-lang/rust/pull/28034
6997 [cu]: https://github.com/rust-lang/cargo/pull/1931
6998 [d]: https://github.com/rust-lang/rust/pull/27825
6999 [dep]: https://github.com/rust-lang/rust/pull/28339
7000 [es]: https://github.com/rust-lang/rust/pull/27956
7001 [ext]: https://github.com/rust-lang/rust/pull/28094
7002 [faststr]: https://github.com/rust-lang/rust/pull/28338
7003 [ffi]: https://github.com/rust-lang/rust/pull/28779
7004 [fp]: https://github.com/rust-lang/rust/pull/28268
7005 [fp2]: https://github.com/rust-lang/rust/pull/28560
7006 [fp3]: https://github.com/rust-lang/rust/pull/27307
7007 [i]: https://github.com/rust-lang/rust/pull/27451
7008 [into2]: https://github.com/rust-lang/rust/pull/28039
7009 [it]: https://github.com/rust-lang/rust/pull/27652
7010 [mm]: https://github.com/rust-lang/rust/pull/27338
7011 [mutw]: https://github.com/rust-lang/rust/pull/28368
7012 [sound]: https://github.com/rust-lang/rust/pull/27641
7013 [p]: https://github.com/rust-lang/rust/pull/27866
7014 [pec]: https://github.com/rust-lang/rust/pull/28486
7015 [pr]: https://github.com/rust-lang/rust/pull/27896
7016 [RFC 839]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7017 [RFC 1214]: https://github.com/rust-lang/rfcs/blob/master/text/1214-projections-lifetimes-and-wf.md
7018 [s]: https://github.com/rust-lang/rust/pull/27474
7019 [stab]: https://github.com/rust-lang/rust/pull/28339
7020 [stat]: https://github.com/rust-lang/rust/pull/28321
7021 [vd]: https://github.com/rust-lang/rust/pull/28494
7023 Version 1.3.0 (2015-09-17)
7024 ==============================
7026 * ~900 changes, numerous bugfixes
7031 * The [new object lifetime defaults][nold] have been [turned
7032 on][nold2] after a cycle of warnings about the change. Now types
7033 like `&'a Box<Trait>` (or `&'a Rc<Trait>`, etc) will change from
7034 being interpreted as `&'a Box<Trait+'a>` to `&'a
7035 Box<Trait+'static>`.
7036 * [The Rustonomicon][nom] is a new book in the official documentation
7037 that dives into writing unsafe Rust.
7038 * The [`Duration`] API, [has been stabilized][ds]. This basic unit of
7039 timekeeping is employed by other std APIs, as well as out-of-tree
7045 * The [new object lifetime defaults][nold] have been [turned
7046 on][nold2] after a cycle of warnings about the change.
7047 * There is a known [regression][lr] in how object lifetime elision is
7048 interpreted, the proper solution for which is undetermined.
7049 * The `#[prelude_import]` attribute, an internal implementation
7050 detail, was accidentally stabilized previously. [It has been put
7051 behind the `prelude_import` feature gate][pi]. This change is
7052 believed to break no existing code.
7053 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7054 [more sane for dynamically sized types][dst3]. Code that relied on
7055 the previous behavior is thought to be broken.
7056 * The `dropck` rules, which checks that destructors can't access
7057 destroyed values, [have been updated][dropck] to match the
7058 [RFC][dropckrfc]. This fixes some soundness holes, and as such will
7059 cause some previously-compiling code to no longer build.
7064 * The [new object lifetime defaults][nold] have been [turned
7065 on][nold2] after a cycle of warnings about the change.
7066 * Semicolons may [now follow types and paths in
7067 macros](https://github.com/rust-lang/rust/pull/27000).
7068 * The behavior of [`size_of_val`][dst1] and [`align_of_val`][dst2] is
7069 [more sane for dynamically sized types][dst3]. Code that relied on
7070 the previous behavior is not known to exist, and suspected to be
7072 * `'static` variables [may now be recursive][st].
7073 * `ref` bindings choose between [`Deref`] and [`DerefMut`]
7074 implementations correctly.
7075 * The `dropck` rules, which checks that destructors can't access
7076 destroyed values, [have been updated][dropck] to match the
7082 * The [`Duration`] API, [has been stabilized][ds], as well as the
7083 `std::time` module, which presently contains only `Duration`.
7084 * `Box<str>` and `Box<[T]>` both implement `Clone`.
7085 * The owned C string, [`CString`], implements [`Borrow`] and the
7086 borrowed C string, [`CStr`], implements [`ToOwned`]. The two of
7087 these allow C strings to be borrowed and cloned in generic code.
7088 * [`CStr`] implements [`Debug`].
7089 * [`AtomicPtr`] implements [`Debug`].
7090 * [`Error`] trait objects [can be downcast to their concrete types][e]
7091 in many common configurations, using the [`is`], [`downcast`],
7092 [`downcast_ref`] and [`downcast_mut`] methods, similarly to the
7094 * Searching for substrings now [employs the two-way algorithm][search]
7095 instead of doing a naive search. This gives major speedups to a
7096 number of methods, including [`contains`][sc], [`find`][sf],
7097 [`rfind`][srf], [`split`][ss]. [`starts_with`][ssw] and
7098 [`ends_with`][sew] are also faster.
7099 * The performance of `PartialEq` for slices is [much faster][ps].
7100 * The [`Hash`] trait offers the default method, [`hash_slice`], which
7101 is overridden and optimized by the implementations for scalars.
7102 * The [`Hasher`] trait now has a number of specialized `write_*`
7103 methods for primitive types, for efficiency.
7104 * The I/O-specific error type, [`std::io::Error`][ie], gained a set of
7105 methods for accessing the 'inner error', if any: [`get_ref`][iegr],
7106 [`get_mut`][iegm], [`into_inner`][ieii]. As well, the implementation
7107 of [`std::error::Error::cause`][iec] also delegates to the inner
7109 * [`process::Child`][pc] gained the [`id`] method, which returns a
7110 `u32` representing the platform-specific process identifier.
7111 * The [`connect`] method on slices is deprecated, replaced by the new
7112 [`join`] method (note that both of these are on the *unstable*
7113 [`SliceConcatExt`] trait, but through the magic of the prelude are
7114 available to stable code anyway).
7115 * The [`Div`] operator is implemented for [`Wrapping`] types.
7116 * [`DerefMut` is implemented for `String`][dms].
7117 * Performance of SipHash (the default hasher for `HashMap`) is
7118 [better for long data][sh].
7119 * [`AtomicPtr`] implements [`Send`].
7120 * The [`read_to_end`] implementations for [`Stdin`] and [`File`]
7121 are now [specialized to use uninitialized buffers for increased
7123 * Lifetime parameters of foreign functions [are now resolved
7129 * Rust can now, with some coercion, [produce programs that run on
7130 Windows XP][xp], though XP is not considered a supported platform.
7131 * Porting Rust on Windows from the GNU toolchain to MSVC continues
7132 ([1][win1], [2][win2], [3][win3], [4][win4]). It is still not
7133 recommended for use in 1.3, though should be fully-functional
7134 in the [64-bit 1.4 beta][b14].
7135 * On Fedora-based systems installation will [properly configure the
7136 dynamic linker][fl].
7137 * The compiler gained many new extended error descriptions, which can
7138 be accessed with the `--explain` flag.
7139 * The `dropck` pass, which checks that destructors can't access
7140 destroyed values, [has been rewritten][dropck]. This fixes some
7141 soundness holes, and as such will cause some previously-compiling
7142 code to no longer build.
7143 * `rustc` now uses [LLVM to write archive files where possible][ar].
7144 Eventually this will eliminate the compiler's dependency on the ar
7146 * Rust has [preliminary support for i686 FreeBSD][fb] (it has long
7147 supported FreeBSD on x86_64).
7148 * The [`unused_mut`][lum], [`unconditional_recursion`][lur],
7149 [`improper_ctypes`][lic], and [`negate_unsigned`][lnu] lints are
7151 * If landing pads are disabled (with `-Z no-landing-pads`), [`panic!`
7152 will kill the process instead of leaking][nlp].
7154 [`Any`]: http://doc.rust-lang.org/nightly/std/any/trait.Any.html
7155 [`AtomicPtr`]: http://doc.rust-lang.org/nightly/std/sync/atomic/struct.AtomicPtr.html
7156 [`Borrow`]: http://doc.rust-lang.org/nightly/std/borrow/trait.Borrow.html
7157 [`CStr`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CStr.html
7158 [`CString`]: http://doc.rust-lang.org/nightly/std/ffi/struct.CString.html
7159 [`Debug`]: http://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7160 [`DerefMut`]: http://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7161 [`Deref`]: http://doc.rust-lang.org/nightly/std/ops/trait.Deref.html
7162 [`Div`]: http://doc.rust-lang.org/nightly/std/ops/trait.Div.html
7163 [`Duration`]: http://doc.rust-lang.org/nightly/std/time/struct.Duration.html
7164 [`Error`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html
7165 [`File`]: http://doc.rust-lang.org/nightly/std/fs/struct.File.html
7166 [`Hash`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html
7167 [`Hasher`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hasher.html
7168 [`Send`]: http://doc.rust-lang.org/nightly/std/marker/trait.Send.html
7169 [`SliceConcatExt`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html
7170 [`Stdin`]: http://doc.rust-lang.org/nightly/std/io/struct.Stdin.html
7171 [`ToOwned`]: http://doc.rust-lang.org/nightly/std/borrow/trait.ToOwned.html
7172 [`Wrapping`]: http://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7173 [`connect`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.connect
7174 [`downcast_mut`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_mut
7175 [`downcast_ref`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast_ref
7176 [`downcast`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.downcast
7177 [`hash_slice`]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7178 [`id`]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html#method.id
7179 [`is`]: http://doc.rust-lang.org/nightly/std/error/trait.Error.html#method.is
7180 [`join`]: http://doc.rust-lang.org/nightly/std/slice/trait.SliceConcatExt.html#method.join
7181 [`read_to_end`]: http://doc.rust-lang.org/nightly/std/io/trait.Read.html#method.read_to_end
7182 [ar]: https://github.com/rust-lang/rust/pull/26926
7183 [b14]: https://static.rust-lang.org/dist/rust-beta-x86_64-pc-windows-msvc.msi
7184 [dms]: https://github.com/rust-lang/rust/pull/26241
7185 [dropck]: https://github.com/rust-lang/rust/pull/27261
7186 [dropckrfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7187 [ds]: https://github.com/rust-lang/rust/pull/26818
7188 [dst1]: http://doc.rust-lang.org/nightly/std/mem/fn.size_of_val.html
7189 [dst2]: http://doc.rust-lang.org/nightly/std/mem/fn.align_of_val.html
7190 [dst3]: https://github.com/rust-lang/rust/pull/27351
7191 [e]: https://github.com/rust-lang/rust/pull/24793
7192 [f]: https://github.com/rust-lang/rust/pull/26588
7193 [fb]: https://github.com/rust-lang/rust/pull/26959
7194 [fl]: https://github.com/rust-lang/rust-installer/pull/41
7195 [hs]: http://doc.rust-lang.org/nightly/std/hash/trait.Hash.html#method.hash_slice
7196 [ie]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html
7197 [iec]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.cause
7198 [iegm]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_mut
7199 [iegr]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.get_ref
7200 [ieii]: http://doc.rust-lang.org/nightly/std/io/struct.Error.html#method.into_inner
7201 [lic]: https://github.com/rust-lang/rust/pull/26583
7202 [lnu]: https://github.com/rust-lang/rust/pull/27026
7203 [lr]: https://github.com/rust-lang/rust/issues/27248
7204 [lum]: https://github.com/rust-lang/rust/pull/26378
7205 [lur]: https://github.com/rust-lang/rust/pull/26783
7206 [nlp]: https://github.com/rust-lang/rust/pull/27176
7207 [nold2]: https://github.com/rust-lang/rust/pull/27045
7208 [nold]: https://github.com/rust-lang/rfcs/blob/master/text/1156-adjust-default-object-bounds.md
7209 [nom]: http://doc.rust-lang.org/nightly/nomicon/
7210 [pc]: http://doc.rust-lang.org/nightly/std/process/struct.Child.html
7211 [pi]: https://github.com/rust-lang/rust/pull/26699
7212 [ps]: https://github.com/rust-lang/rust/pull/26884
7213 [rte]: https://github.com/rust-lang/rust/pull/26950
7214 [sc]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.contains
7215 [search]: https://github.com/rust-lang/rust/pull/26327
7216 [sew]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.ends_with
7217 [sf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.find
7218 [sh]: https://github.com/rust-lang/rust/pull/27280
7219 [srf]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.rfind
7220 [ss]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.split
7221 [ssw]: http://doc.rust-lang.org/nightly/std/primitive.str.html#method.starts_with
7222 [st]: https://github.com/rust-lang/rust/pull/26630
7223 [win1]: https://github.com/rust-lang/rust/pull/26569
7224 [win2]: https://github.com/rust-lang/rust/pull/26741
7225 [win3]: https://github.com/rust-lang/rust/pull/26741
7226 [win4]: https://github.com/rust-lang/rust/pull/27210
7227 [xp]: https://github.com/rust-lang/rust/pull/26569
7229 Version 1.2.0 (2015-08-07)
7230 ==========================
7232 * ~1200 changes, numerous bugfixes
7237 * [Dynamically-sized-type coercions][dst] allow smart pointer types
7238 like `Rc` to contain types without a fixed size, arrays and trait
7239 objects, finally enabling use of `Rc<[T]>` and completing the
7240 implementation of DST.
7241 * [Parallel codegen][parcodegen] is now working again, which can
7242 substantially speed up large builds in debug mode; It also gets
7243 another ~33% speedup when bootstrapping on a 4 core machine (using 8
7244 jobs). It's not enabled by default, but will be "in the near
7245 future". It can be activated with the `-C codegen-units=N` flag to
7247 * This is the first release with [experimental support for linking
7248 with the MSVC linker and lib C on Windows (instead of using the GNU
7249 variants via MinGW)][win]. It is yet recommended only for the most
7250 intrepid Rustaceans.
7251 * Benchmark compilations are showing a 30% improvement in
7252 bootstrapping over 1.1.
7257 * The [`to_uppercase`] and [`to_lowercase`] methods on `char` now do
7258 unicode case mapping, which is a previously-planned change in
7259 behavior and considered a bugfix.
7260 * [`mem::align_of`] now specifies [the *minimum alignment* for
7261 T][align], which is usually the alignment programs are interested
7262 in, and the same value reported by clang's
7263 `alignof`. [`mem::min_align_of`] is deprecated. This is not known to
7265 * [The `#[packed]` attribute is no longer silently accepted by the
7266 compiler][packed]. This attribute did nothing and code that
7267 mentioned it likely did not work as intended.
7268 * Associated type defaults are [now behind the
7269 `associated_type_defaults` feature gate][ad]. In 1.1 associated type
7270 defaults *did not work*, but could be mentioned syntactically. As
7271 such this breakage has minimal impact.
7276 * Patterns with `ref mut` now correctly invoke [`DerefMut`] when
7277 matching against dereferenceable values.
7282 * The [`Extend`] trait, which grows a collection from an iterator, is
7283 implemented over iterators of references, for `String`, `Vec`,
7284 `LinkedList`, `VecDeque`, `EnumSet`, `BinaryHeap`, `VecMap`,
7285 `BTreeSet` and `BTreeMap`. [RFC][extend-rfc].
7286 * The [`iter::once`] function returns an iterator that yields a single
7287 element, and [`iter::empty`] returns an iterator that yields no
7289 * The [`matches`] and [`rmatches`] methods on `str` return iterators
7290 over substring matches.
7291 * [`Cell`] and [`RefCell`] both implement `Eq`.
7292 * A number of methods for wrapping arithmetic are added to the
7293 integral types, [`wrapping_div`], [`wrapping_rem`],
7294 [`wrapping_neg`], [`wrapping_shl`], [`wrapping_shr`]. These are in
7295 addition to the existing [`wrapping_add`], [`wrapping_sub`], and
7296 [`wrapping_mul`] methods, and alternatives to the [`Wrapping`]
7297 type.. It is illegal for the default arithmetic operations in Rust
7298 to overflow; the desire to wrap must be explicit.
7299 * The `{:#?}` formatting specifier [displays the alternate,
7300 pretty-printed][debugfmt] form of the `Debug` formatter. This
7301 feature was actually introduced prior to 1.0 with little
7303 * [`fmt::Formatter`] implements [`fmt::Write`], a `fmt`-specific trait
7304 for writing data to formatted strings, similar to [`io::Write`].
7305 * [`fmt::Formatter`] adds 'debug builder' methods, [`debug_struct`],
7306 [`debug_tuple`], [`debug_list`], [`debug_set`], [`debug_map`]. These
7307 are used by code generators to emit implementations of [`Debug`].
7308 * `str` has new [`to_uppercase`][strup] and [`to_lowercase`][strlow]
7309 methods that convert case, following Unicode case mapping.
7310 * It is now easier to handle poisoned locks. The [`PoisonError`]
7311 type, returned by failing lock operations, exposes `into_inner`,
7312 `get_ref`, and `get_mut`, which all give access to the inner lock
7313 guard, and allow the poisoned lock to continue to operate. The
7314 `is_poisoned` method of [`RwLock`] and [`Mutex`] can poll for a
7315 poisoned lock without attempting to take the lock.
7316 * On Unix the [`FromRawFd`] trait is implemented for [`Stdio`], and
7317 [`AsRawFd`] for [`ChildStdin`], [`ChildStdout`], [`ChildStderr`].
7318 On Windows the `FromRawHandle` trait is implemented for `Stdio`,
7319 and `AsRawHandle` for `ChildStdin`, `ChildStdout`,
7321 * [`io::ErrorKind`] has a new variant, `InvalidData`, which indicates
7327 * `rustc` employs smarter heuristics for guessing at [typos].
7328 * `rustc` emits more efficient code for [no-op conversions between
7329 unsafe pointers][nop].
7330 * Fat pointers are now [passed in pairs of immediate arguments][fat],
7331 resulting in faster compile times and smaller code.
7333 [`Extend`]: https://doc.rust-lang.org/nightly/std/iter/trait.Extend.html
7334 [extend-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0839-embrace-extend-extinguish.md
7335 [`iter::once`]: https://doc.rust-lang.org/nightly/std/iter/fn.once.html
7336 [`iter::empty`]: https://doc.rust-lang.org/nightly/std/iter/fn.empty.html
7337 [`matches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.matches
7338 [`rmatches`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.rmatches
7339 [`Cell`]: https://doc.rust-lang.org/nightly/std/cell/struct.Cell.html
7340 [`RefCell`]: https://doc.rust-lang.org/nightly/std/cell/struct.RefCell.html
7341 [`wrapping_add`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_add
7342 [`wrapping_sub`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_sub
7343 [`wrapping_mul`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_mul
7344 [`wrapping_div`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_div
7345 [`wrapping_rem`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_rem
7346 [`wrapping_neg`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_neg
7347 [`wrapping_shl`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shl
7348 [`wrapping_shr`]: https://doc.rust-lang.org/nightly/std/primitive.i8.html#method.wrapping_shr
7349 [`Wrapping`]: https://doc.rust-lang.org/nightly/std/num/struct.Wrapping.html
7350 [`fmt::Formatter`]: https://doc.rust-lang.org/nightly/std/fmt/struct.Formatter.html
7351 [`fmt::Write`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Write.html
7352 [`io::Write`]: https://doc.rust-lang.org/nightly/std/io/trait.Write.html
7353 [`debug_struct`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_struct
7354 [`debug_tuple`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_tuple
7355 [`debug_list`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_list
7356 [`debug_set`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_set
7357 [`debug_map`]: https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html#method.debug_map
7358 [`Debug`]: https://doc.rust-lang.org/nightly/std/fmt/trait.Debug.html
7359 [strup]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_uppercase
7360 [strlow]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.to_lowercase
7361 [`to_uppercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_uppercase
7362 [`to_lowercase`]: https://doc.rust-lang.org/nightly/std/primitive.char.html#method.to_lowercase
7363 [`PoisonError`]: https://doc.rust-lang.org/nightly/std/sync/struct.PoisonError.html
7364 [`RwLock`]: https://doc.rust-lang.org/nightly/std/sync/struct.RwLock.html
7365 [`Mutex`]: https://doc.rust-lang.org/nightly/std/sync/struct.Mutex.html
7366 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7367 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7368 [`Stdio`]: https://doc.rust-lang.org/nightly/std/process/struct.Stdio.html
7369 [`ChildStdin`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdin.html
7370 [`ChildStdout`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStdout.html
7371 [`ChildStderr`]: https://doc.rust-lang.org/nightly/std/process/struct.ChildStderr.html
7372 [`io::ErrorKind`]: https://doc.rust-lang.org/nightly/std/io/enum.ErrorKind.html
7373 [debugfmt]: https://www.reddit.com/r/rust/comments/3ceaui/psa_produces_prettyprinted_debug_output/
7374 [`DerefMut`]: https://doc.rust-lang.org/nightly/std/ops/trait.DerefMut.html
7375 [`mem::align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.align_of.html
7376 [align]: https://github.com/rust-lang/rust/pull/25646
7377 [`mem::min_align_of`]: https://doc.rust-lang.org/nightly/std/mem/fn.min_align_of.html
7378 [typos]: https://github.com/rust-lang/rust/pull/26087
7379 [nop]: https://github.com/rust-lang/rust/pull/26336
7380 [fat]: https://github.com/rust-lang/rust/pull/26411
7381 [dst]: https://github.com/rust-lang/rfcs/blob/master/text/0982-dst-coercion.md
7382 [parcodegen]: https://github.com/rust-lang/rust/pull/26018
7383 [packed]: https://github.com/rust-lang/rust/pull/25541
7384 [ad]: https://github.com/rust-lang/rust/pull/27382
7385 [win]: https://github.com/rust-lang/rust/pull/25350
7387 Version 1.1.0 (2015-06-25)
7388 =========================
7390 * ~850 changes, numerous bugfixes
7395 * The [`std::fs` module has been expanded][fs] to expand the set of
7396 functionality exposed:
7397 * `DirEntry` now supports optimizations like `file_type` and `metadata` which
7398 don't incur a syscall on some platforms.
7399 * A `symlink_metadata` function has been added.
7400 * The `fs::Metadata` structure now lowers to its OS counterpart, providing
7401 access to all underlying information.
7402 * The compiler now contains extended explanations of many errors. When an error
7403 with an explanation occurs the compiler suggests using the `--explain` flag
7404 to read the explanation. Error explanations are also [available online][err-index].
7405 * Thanks to multiple [improvements][sk] to [type checking][pre], as
7406 well as other work, the time to bootstrap the compiler decreased by
7412 * The [`str::split_whitespace`] method splits a string on unicode
7413 whitespace boundaries.
7414 * On both Windows and Unix, new extension traits provide conversion of
7415 I/O types to and from the underlying system handles. On Unix, these
7416 traits are [`FromRawFd`] and [`AsRawFd`], on Windows `FromRawHandle`
7417 and `AsRawHandle`. These are implemented for `File`, `TcpStream`,
7418 `TcpListener`, and `UpdSocket`. Further implementations for
7419 `std::process` will be stabilized later.
7420 * On Unix, [`std::os::unix::symlink`] creates symlinks. On
7421 Windows, symlinks can be created with
7422 `std::os::windows::symlink_dir` and
7423 `std::os::windows::symlink_file`.
7424 * The `mpsc::Receiver` type can now be converted into an iterator with
7425 `into_iter` on the [`IntoIterator`] trait.
7426 * `Ipv4Addr` can be created from `u32` with the `From<u32>`
7427 implementation of the [`From`] trait.
7428 * The `Debug` implementation for `RangeFull` [creates output that is
7429 more consistent with other implementations][rf].
7430 * [`Debug` is implemented for `File`][file].
7431 * The `Default` implementation for `Arc` [no longer requires `Sync +
7433 * [The `Iterator` methods `count`, `nth`, and `last` have been
7434 overridden for slices to have O(1) performance instead of O(n)][si].
7435 * Incorrect handling of paths on Windows has been improved in both the
7436 compiler and the standard library.
7437 * [`AtomicPtr` gained a `Default` implementation][ap].
7438 * In accordance with Rust's policy on arithmetic overflow `abs` now
7439 [panics on overflow when debug assertions are enabled][abs].
7440 * The [`Cloned`] iterator, which was accidentally left unstable for
7441 1.0 [has been stabilized][c].
7442 * The [`Incoming`] iterator, which iterates over incoming TCP
7443 connections, and which was accidentally unnamable in 1.0, [is now
7444 properly exported][inc].
7445 * [`BinaryHeap`] no longer corrupts itself [when functions called by
7446 `sift_up` or `sift_down` panic][bh].
7447 * The [`split_off`] method of `LinkedList` [no longer corrupts
7448 the list in certain scenarios][ll].
7453 * Type checking performance [has improved notably][sk] with
7454 [multiple improvements][pre].
7455 * The compiler [suggests code changes][ch] for more errors.
7456 * rustc and it's build system have experimental support for [building
7457 toolchains against MUSL][m] instead of glibc on Linux.
7458 * The compiler defines the `target_env` cfg value, which is used for
7459 distinguishing toolchains that are otherwise for the same
7460 platform. Presently this is set to `gnu` for common GNU Linux
7461 targets and for MinGW targets, and `musl` for MUSL Linux targets.
7462 * The [`cargo rustc`][crc] command invokes a build with custom flags
7464 * [Android executables are always position independent][pie].
7465 * [The `drop_with_repr_extern` lint warns about mixing `repr(C)`
7468 [`str::split_whitespace`]: https://doc.rust-lang.org/nightly/std/primitive.str.html#method.split_whitespace
7469 [`FromRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.FromRawFd.html
7470 [`AsRawFd`]: https://doc.rust-lang.org/nightly/std/os/unix/io/trait.AsRawFd.html
7471 [`std::os::unix::symlink`]: https://doc.rust-lang.org/nightly/std/os/unix/fs/fn.symlink.html
7472 [`IntoIterator`]: https://doc.rust-lang.org/nightly/std/iter/trait.IntoIterator.html
7473 [`From`]: https://doc.rust-lang.org/nightly/std/convert/trait.From.html
7474 [rf]: https://github.com/rust-lang/rust/pull/24491
7475 [err-index]: https://doc.rust-lang.org/error-index.html
7476 [sk]: https://github.com/rust-lang/rust/pull/24615
7477 [pre]: https://github.com/rust-lang/rust/pull/25323
7478 [file]: https://github.com/rust-lang/rust/pull/24598
7479 [ch]: https://github.com/rust-lang/rust/pull/24683
7480 [arc]: https://github.com/rust-lang/rust/pull/24695
7481 [si]: https://github.com/rust-lang/rust/pull/24701
7482 [ap]: https://github.com/rust-lang/rust/pull/24834
7483 [m]: https://github.com/rust-lang/rust/pull/24777
7484 [fs]: https://github.com/rust-lang/rfcs/blob/master/text/1044-io-fs-2.1.md
7485 [crc]: https://github.com/rust-lang/cargo/pull/1568
7486 [pie]: https://github.com/rust-lang/rust/pull/24953
7487 [abs]: https://github.com/rust-lang/rust/pull/25441
7488 [c]: https://github.com/rust-lang/rust/pull/25496
7489 [`Cloned`]: https://doc.rust-lang.org/nightly/std/iter/struct.Cloned.html
7490 [`Incoming`]: https://doc.rust-lang.org/nightly/std/net/struct.Incoming.html
7491 [inc]: https://github.com/rust-lang/rust/pull/25522
7492 [bh]: https://github.com/rust-lang/rust/pull/25856
7493 [`BinaryHeap`]: https://doc.rust-lang.org/nightly/std/collections/struct.BinaryHeap.html
7494 [ll]: https://github.com/rust-lang/rust/pull/26022
7495 [`split_off`]: https://doc.rust-lang.org/nightly/collections/linked_list/struct.LinkedList.html#method.split_off
7496 [drop]: https://github.com/rust-lang/rust/pull/24935
7498 Version 1.0.0 (2015-05-15)
7499 ========================
7501 * ~1500 changes, numerous bugfixes
7506 * The vast majority of the standard library is now `#[stable]`. It is
7507 no longer possible to use unstable features with a stable build of
7509 * Many popular crates on [crates.io] now work on the stable release
7511 * Arithmetic on basic integer types now [checks for overflow in debug
7517 * Several [restrictions have been added to trait coherence][coh] in
7518 order to make it easier for upstream authors to change traits
7519 without breaking downstream code.
7520 * Digits of binary and octal literals are [lexed more eagerly][lex] to
7521 improve error messages and macro behavior. For example, `0b1234` is
7522 now lexed as `0b1234` instead of two tokens, `0b1` and `234`.
7523 * Trait bounds [are always invariant][inv], eliminating the need for
7524 the `PhantomFn` and `MarkerTrait` lang items, which have been
7526 * ["-" is no longer a valid character in crate names][cr], the `extern crate
7527 "foo" as bar` syntax has been replaced with `extern crate foo as
7528 bar`, and Cargo now automatically translates "-" in *package* names
7529 to underscore for the crate name.
7530 * [Lifetime shadowing is an error][lt].
7531 * [`Send` no longer implies `'static`][send-rfc].
7532 * [UFCS now supports trait-less associated paths][moar-ufcs] like
7533 `MyType::default()`.
7534 * Primitive types [now have inherent methods][prim-inherent],
7535 obviating the need for extension traits like `SliceExt`.
7536 * Methods with `Self: Sized` in their `where` clause are [considered
7537 object-safe][self-sized], allowing many extension traits like
7538 `IteratorExt` to be merged into the traits they extended.
7539 * You can now [refer to associated types][assoc-where] whose
7540 corresponding trait bounds appear only in a `where` clause.
7541 * The final bits of [OIBIT landed][oibit-final], meaning that traits
7542 like `Send` and `Sync` are now library-defined.
7543 * A [Reflect trait][reflect] was introduced, which means that
7544 downcasting via the `Any` trait is effectively limited to concrete
7545 types. This helps retain the potentially-important "parametricity"
7546 property: generic code cannot behave differently for different type
7547 arguments except in minor ways.
7548 * The `unsafe_destructor` feature is now deprecated in favor of the
7549 [new `dropck`][dropck]. This change is a major reduction in unsafe
7555 * The `thread_local` module [has been renamed to `std::thread`][th].
7556 * The methods of `IteratorExt` [have been moved to the `Iterator`
7558 * Several traits that implement Rust's conventions for type
7559 conversions, `AsMut`, `AsRef`, `From`, and `Into` have been
7560 [centralized in the `std::convert` module][con].
7561 * The `FromError` trait [was removed in favor of `From`][fe].
7562 * The basic sleep function [has moved to
7563 `std::thread::sleep_ms`][slp].
7564 * The `splitn` function now takes an `n` parameter that represents the
7565 number of items yielded by the returned iterator [instead of the
7566 number of 'splits'][spl].
7567 * [On Unix, all file descriptors are `CLOEXEC` by default][clo].
7568 * [Derived implementations of `PartialOrd` now order enums according
7569 to their explicitly-assigned discriminants][po].
7570 * [Methods for searching strings are generic over `Pattern`s][pat],
7571 implemented presently by `&char`, `&str`, `FnMut(char) -> bool` and
7573 * [In method resolution, object methods are resolved before inherent
7575 * [`String::from_str` has been deprecated in favor of the `From` impl,
7576 `String::from`][sf].
7577 * [`io::Error` implements `Sync`][ios].
7578 * [The `words` method on `&str` has been replaced with
7579 `split_whitespace`][sw], to avoid answering the tricky question, 'what is
7581 * The new path and IO modules are complete and `#[stable]`. This
7582 was the major library focus for this cycle.
7583 * The path API was [revised][path-normalize] to normalize `.`,
7584 adjusting the tradeoffs in favor of the most common usage.
7585 * A large number of remaining APIs in `std` were also stabilized
7586 during this cycle; about 75% of the non-deprecated API surface
7588 * The new [string pattern API][string-pattern] landed, which makes
7589 the string slice API much more internally consistent and flexible.
7590 * A new set of [generic conversion traits][conversion] replaced
7591 many existing ad hoc traits.
7592 * Generic numeric traits were [completely removed][num-traits]. This
7593 was made possible thanks to inherent methods for primitive types,
7594 and the removal gives maximal flexibility for designing a numeric
7595 hierarchy in the future.
7596 * The `Fn` traits are now related via [inheritance][fn-inherit]
7597 and provide ergonomic [blanket implementations][fn-blanket].
7598 * The `Index` and `IndexMut` traits were changed to
7599 [take the index by value][index-value], enabling code like
7600 `hash_map["string"]` to work.
7601 * `Copy` now [inherits][copy-clone] from `Clone`, meaning that all
7602 `Copy` data is known to be `Clone` as well.
7607 * Many errors now have extended explanations that can be accessed with
7608 the `--explain` flag to `rustc`.
7609 * Many new examples have been added to the standard library
7611 * rustdoc has received a number of improvements focused on completion
7613 * Metadata was tuned, shrinking binaries [by 27%][metadata-shrink].
7614 * Much headway was made on ecosystem-wide CI, making it possible
7615 to [compare builds for breakage][ci-compare].
7618 [crates.io]: http://crates.io
7619 [clo]: https://github.com/rust-lang/rust/pull/24034
7620 [coh]: https://github.com/rust-lang/rfcs/blob/master/text/1023-rebalancing-coherence.md
7621 [con]: https://github.com/rust-lang/rust/pull/23875
7622 [cr]: https://github.com/rust-lang/rust/pull/23419
7623 [fe]: https://github.com/rust-lang/rust/pull/23879
7624 [ie]: https://github.com/rust-lang/rust/pull/23300
7625 [inv]: https://github.com/rust-lang/rust/pull/23938
7626 [ios]: https://github.com/rust-lang/rust/pull/24133
7627 [lex]: https://github.com/rust-lang/rfcs/blob/master/text/0879-small-base-lexing.md
7628 [lt]: https://github.com/rust-lang/rust/pull/24057
7629 [meth]: https://github.com/rust-lang/rust/pull/24056
7630 [pat]: https://github.com/rust-lang/rfcs/blob/master/text/0528-string-patterns.md
7631 [po]: https://github.com/rust-lang/rust/pull/24270
7632 [sf]: https://github.com/rust-lang/rust/pull/24517
7633 [slp]: https://github.com/rust-lang/rust/pull/23949
7634 [spl]: https://github.com/rust-lang/rfcs/blob/master/text/0979-align-splitn-with-other-languages.md
7635 [sw]: https://github.com/rust-lang/rfcs/blob/master/text/1054-str-words.md
7636 [th]: https://github.com/rust-lang/rfcs/blob/master/text/0909-move-thread-local-to-std-thread.md
7637 [send-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0458-send-improvements.md
7638 [moar-ufcs]: https://github.com/rust-lang/rust/pull/22172
7639 [prim-inherent]: https://github.com/rust-lang/rust/pull/23104
7640 [overflow]: https://github.com/rust-lang/rfcs/blob/master/text/0560-integer-overflow.md
7641 [metadata-shrink]: https://github.com/rust-lang/rust/pull/22971
7642 [self-sized]: https://github.com/rust-lang/rust/pull/22301
7643 [assoc-where]: https://github.com/rust-lang/rust/pull/22512
7644 [string-pattern]: https://github.com/rust-lang/rust/pull/22466
7645 [oibit-final]: https://github.com/rust-lang/rust/pull/21689
7646 [reflect]: https://github.com/rust-lang/rust/pull/23712
7647 [conversion]: https://github.com/rust-lang/rfcs/pull/529
7648 [num-traits]: https://github.com/rust-lang/rust/pull/23549
7649 [index-value]: https://github.com/rust-lang/rust/pull/23601
7650 [dropck]: https://github.com/rust-lang/rfcs/pull/769
7651 [ci-compare]: https://gist.github.com/brson/a30a77836fbec057cbee
7652 [fn-inherit]: https://github.com/rust-lang/rust/pull/23282
7653 [fn-blanket]: https://github.com/rust-lang/rust/pull/23895
7654 [copy-clone]: https://github.com/rust-lang/rust/pull/23860
7655 [path-normalize]: https://github.com/rust-lang/rust/pull/23229
7658 Version 1.0.0-alpha.2 (2015-02-20)
7659 =====================================
7661 * ~1300 changes, numerous bugfixes
7665 * The various I/O modules were [overhauled][io-rfc] to reduce
7666 unnecessary abstractions and provide better interoperation with
7667 the underlying platform. The old `io` module remains temporarily
7669 * The standard library now [participates in feature gating][feat],
7670 so use of unstable libraries now requires a `#![feature(...)]`
7671 attribute. The impact of this change is [described on the
7672 forum][feat-forum]. [RFC][feat-rfc].
7676 * `for` loops [now operate on the `IntoIterator` trait][into],
7677 which eliminates the need to call `.iter()`, etc. to iterate
7678 over collections. There are some new subtleties to remember
7679 though regarding what sort of iterators various types yield, in
7680 particular that `for foo in bar { }` yields values from a move
7681 iterator, destroying the original collection. [RFC][into-rfc].
7682 * Objects now have [default lifetime bounds][obj], so you don't
7683 have to write `Box<Trait+'static>` when you don't care about
7684 storing references. [RFC][obj-rfc].
7685 * In types that implement `Drop`, [lifetimes must outlive the
7686 value][drop]. This will soon make it possible to safely
7687 implement `Drop` for types where `#[unsafe_destructor]` is now
7688 required. Read the [gorgeous RFC][drop-rfc] for details.
7689 * The fully qualified <T as Trait>::X syntax lets you set the Self
7690 type for a trait method or associated type. [RFC][ufcs-rfc].
7691 * References to types that implement `Deref<U>` now [automatically
7692 coerce to references][deref] to the dereferenced type `U`,
7693 e.g. `&T where T: Deref<U>` automatically coerces to `&U`. This
7694 should eliminate many unsightly uses of `&*`, as when converting
7695 from references to vectors into references to
7696 slices. [RFC][deref-rfc].
7697 * The explicit [closure kind syntax][close] (`|&:|`, `|&mut:|`,
7698 `|:|`) is obsolete and closure kind is inferred from context.
7699 * [`Self` is a keyword][Self].
7703 * The `Show` and `String` formatting traits [have been
7704 renamed][fmt] to `Debug` and `Display` to more clearly reflect
7705 their related purposes. Automatically getting a string
7706 conversion to use with `format!("{:?}", something_to_debug)` is
7707 now written `#[derive(Debug)]`.
7708 * Abstract [OS-specific string types][osstr], `std::ff::{OsString,
7709 OsStr}`, provide strings in platform-specific encodings for easier
7710 interop with system APIs. [RFC][osstr-rfc].
7711 * The `boxed::into_raw` and `Box::from_raw` functions [convert
7712 between `Box<T>` and `*mut T`][boxraw], a common pattern for
7713 creating raw pointers.
7717 * Certain long error messages of the form 'expected foo found bar'
7718 are now [split neatly across multiple
7719 lines][multiline]. Examples in the PR.
7720 * On Unix Rust can be [uninstalled][un] by running
7721 `/usr/local/lib/rustlib/uninstall.sh`.
7722 * The `#[rustc_on_unimplemented]` attribute, requiring the
7723 'on_unimplemented' feature, lets rustc [display custom error
7724 messages when a trait is expected to be implemented for a type
7729 * Rust is tested against a [LALR grammar][lalr], which parses
7730 almost all the Rust files that rustc does.
7732 [boxraw]: https://github.com/rust-lang/rust/pull/21318
7733 [close]: https://github.com/rust-lang/rust/pull/21843
7734 [deref]: https://github.com/rust-lang/rust/pull/21351
7735 [deref-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0241-deref-conversions.md
7736 [drop]: https://github.com/rust-lang/rust/pull/21972
7737 [drop-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0769-sound-generic-drop.md
7738 [feat]: https://github.com/rust-lang/rust/pull/21248
7739 [feat-forum]: https://users.rust-lang.org/t/psa-important-info-about-rustcs-new-feature-staging/82/5
7740 [feat-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0507-release-channels.md
7741 [fmt]: https://github.com/rust-lang/rust/pull/21457
7742 [into]: https://github.com/rust-lang/rust/pull/20790
7743 [into-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md#intoiterator-and-iterable
7744 [io-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7745 [lalr]: https://github.com/rust-lang/rust/pull/21452
7746 [multiline]: https://github.com/rust-lang/rust/pull/19870
7747 [obj]: https://github.com/rust-lang/rust/pull/22230
7748 [obj-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0599-default-object-bound.md
7749 [onun]: https://github.com/rust-lang/rust/pull/20889
7750 [osstr]: https://github.com/rust-lang/rust/pull/21488
7751 [osstr-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0517-io-os-reform.md
7752 [Self]: https://github.com/rust-lang/rust/pull/22158
7753 [ufcs-rfc]: https://github.com/rust-lang/rfcs/blob/master/text/0132-ufcs.md
7754 [un]: https://github.com/rust-lang/rust/pull/22256
7757 Version 1.0.0-alpha (2015-01-09)
7758 ==================================
7760 * ~2400 changes, numerous bugfixes
7764 * The language itself is considered feature complete for 1.0,
7765 though there will be many usability improvements and bugfixes
7766 before the final release.
7767 * Nearly 50% of the public API surface of the standard library has
7768 been declared 'stable'. Those interfaces are unlikely to change
7770 * The long-running debate over integer types has been
7771 [settled][ints]: Rust will ship with types named `isize` and
7772 `usize`, rather than `int` and `uint`, for pointer-sized
7773 integers. Guidelines will be rolled out during the alpha cycle.
7774 * Most crates that are not `std` have been moved out of the Rust
7775 distribution into the Cargo ecosystem so they can evolve
7776 separately and don't need to be stabilized as quickly, including
7777 'time', 'getopts', 'num', 'regex', and 'term'.
7778 * Documentation continues to be expanded with more API coverage, more
7779 examples, and more in-depth explanations. The guides have been
7780 consolidated into [The Rust Programming Language][trpl].
7781 * "[Rust By Example][rbe]" is now maintained by the Rust team.
7782 * All official Rust binary installers now come with [Cargo], the
7783 Rust package manager.
7787 * Closures have been [completely redesigned][unboxed] to be
7788 implemented in terms of traits, can now be used as generic type
7789 bounds and thus monomorphized and inlined, or via an opaque
7790 pointer (boxed) as in the old system. The new system is often
7791 referred to as 'unboxed' closures.
7792 * Traits now support [associated types][assoc], allowing families
7793 of related types to be defined together and used generically in
7795 * Enum variants are [namespaced by their type names][enum].
7796 * [`where` clauses][where] provide a more versatile and attractive
7797 syntax for specifying generic bounds, though the previous syntax
7799 * Rust again picks a [fallback][fb] (either i32 or f64) for uninferred
7801 * Rust [no longer has a runtime][rt] of any description, and only
7802 supports OS threads, not green threads.
7803 * At long last, Rust has been overhauled for 'dynamically-sized
7804 types' ([DST]), which integrates 'fat pointers' (object types,
7805 arrays, and `str`) more deeply into the type system, making it
7807 * Rust now has a general [range syntax][range], `i..j`, `i..`, and
7808 `..j` that produce range types and which, when combined with the
7809 `Index` operator and multidispatch, leads to a convenient slice
7811 * The new range syntax revealed an ambiguity in the fixed-length
7812 array syntax, so now fixed length arrays [are written `[T;
7814 * The `Copy` trait is no longer implemented automatically. Unsafe
7815 pointers no longer implement `Sync` and `Send` so types
7816 containing them don't automatically either. `Sync` and `Send`
7817 are now 'unsafe traits' so one can "forcibly" implement them via
7818 `unsafe impl` if a type confirms to the requirements for them
7819 even though the internals do not (e.g. structs containing unsafe
7820 pointers like `Arc`). These changes are intended to prevent some
7821 footguns and are collectively known as [opt-in built-in
7822 traits][oibit] (though `Sync` and `Send` will soon become pure
7823 library types unknown to the compiler).
7824 * Operator traits now take their operands [by value][ops], and
7825 comparison traits can use multidispatch to compare one type
7826 against multiple other types, allowing e.g. `String` to be
7827 compared with `&str`.
7828 * `if let` and `while let` are no longer feature-gated.
7829 * Rust has adopted a more [uniform syntax for escaping unicode
7830 characters][unicode].
7831 * `macro_rules!` [has been declared stable][mac]. Though it is a
7832 flawed system it is sufficiently popular that it must be usable
7833 for 1.0. Effort has gone into [future-proofing][mac-future] it
7834 in ways that will allow other macro systems to be developed in
7835 parallel, and won't otherwise impact the evolution of the
7837 * The prelude has been [pared back significantly][prelude] such
7838 that it is the minimum necessary to support the most pervasive
7839 code patterns, and through [generalized where clauses][where]
7840 many of the prelude extension traits have been consolidated.
7841 * Rust's rudimentary reflection [has been removed][refl], as it
7842 incurred too much code generation for little benefit.
7843 * [Struct variants][structvars] are no longer feature-gated.
7844 * Trait bounds can be [polymorphic over lifetimes][hrtb]. Also
7845 known as 'higher-ranked trait bounds', this crucially allows
7846 unboxed closures to work.
7847 * Macros invocations surrounded by parens or square brackets and
7848 not terminated by a semicolon are [parsed as
7849 expressions][macros], which makes expressions like `vec![1i32,
7850 2, 3].len()` work as expected.
7851 * Trait objects now implement their traits automatically, and
7852 traits that can be coerced to objects now must be [object
7854 * Automatically deriving traits is now done with `#[derive(...)]`
7855 not `#[deriving(...)]` for [consistency with other naming
7856 conventions][derive].
7857 * Importing the containing module or enum at the same time as
7858 items or variants they contain is [now done with `self` instead
7859 of `mod`][self], as in use `foo::{self, bar}`
7860 * Glob imports are no longer feature-gated.
7861 * The `box` operator and `box` patterns have been feature-gated
7862 pending a redesign. For now unique boxes should be allocated
7863 like other containers, with `Box::new`.
7867 * A [series][coll1] of [efforts][coll2] to establish
7868 [conventions][coll3] for collections types has resulted in API
7869 improvements throughout the standard library.
7870 * New [APIs for error handling][err] provide ergonomic interop
7871 between error types, and [new conventions][err-conv] describe
7872 more clearly the recommended error handling strategies in Rust.
7873 * The `fail!` macro has been renamed to [`panic!`][panic] so that
7874 it is easier to discuss failure in the context of error handling
7875 without making clarifications as to whether you are referring to
7876 the 'fail' macro or failure more generally.
7877 * On Linux, `OsRng` prefers the new, more reliable `getrandom`
7878 syscall when available.
7879 * The 'serialize' crate has been renamed 'rustc-serialize' and
7880 moved out of the distribution to Cargo. Although it is widely
7881 used now, it is expected to be superseded in the near future.
7882 * The `Show` formatter, typically implemented with
7883 `#[derive(Show)]` is [now requested with the `{:?}`
7884 specifier][show] and is intended for use by all types, for uses
7885 such as `println!` debugging. The new `String` formatter must be
7886 implemented by hand, uses the `{}` specifier, and is intended
7887 for full-fidelity conversions of things that can logically be
7888 represented as strings.
7892 * [Flexible target specification][flex] allows rustc's code
7893 generation to be configured to support otherwise-unsupported
7895 * Rust comes with rust-gdb and rust-lldb scripts that launch their
7896 respective debuggers with Rust-appropriate pretty-printing.
7897 * The Windows installation of Rust is distributed with the
7898 MinGW components currently required to link binaries on that
7903 * Nullable enum optimizations have been extended to more types so
7904 that e.g. `Option<Vec<T>>` and `Option<String>` take up no more
7905 space than the inner types themselves.
7906 * Work has begun on supporting AArch64.
7908 [Cargo]: https://crates.io
7909 [unboxed]: http://smallcultfollowing.com/babysteps/blog/2014/11/26/purging-proc/
7910 [enum]: https://github.com/rust-lang/rfcs/blob/master/text/0390-enum-namespacing.md
7911 [flex]: https://github.com/rust-lang/rfcs/blob/master/text/0131-target-specification.md
7912 [err]: https://github.com/rust-lang/rfcs/blob/master/text/0201-error-chaining.md
7913 [err-conv]: https://github.com/rust-lang/rfcs/blob/master/text/0236-error-conventions.md
7914 [rt]: https://github.com/rust-lang/rfcs/blob/master/text/0230-remove-runtime.md
7915 [mac]: https://github.com/rust-lang/rfcs/blob/master/text/0453-macro-reform.md
7916 [mac-future]: https://github.com/rust-lang/rfcs/pull/550
7917 [DST]: http://smallcultfollowing.com/babysteps/blog/2014/01/05/dst-take-5/
7918 [coll1]: https://github.com/rust-lang/rfcs/blob/master/text/0235-collections-conventions.md
7919 [coll2]: https://github.com/rust-lang/rfcs/blob/master/text/0509-collections-reform-part-2.md
7920 [coll3]: https://github.com/rust-lang/rfcs/blob/master/text/0216-collection-views.md
7921 [ops]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md
7922 [prelude]: https://github.com/rust-lang/rfcs/blob/master/text/0503-prelude-stabilization.md
7923 [where]: https://github.com/rust-lang/rfcs/blob/master/text/0135-where.md
7924 [refl]: https://github.com/rust-lang/rfcs/blob/master/text/0379-remove-reflection.md
7925 [panic]: https://github.com/rust-lang/rfcs/blob/master/text/0221-panic.md
7926 [structvars]: https://github.com/rust-lang/rfcs/blob/master/text/0418-struct-variants.md
7927 [hrtb]: https://github.com/rust-lang/rfcs/blob/master/text/0387-higher-ranked-trait-bounds.md
7928 [unicode]: https://github.com/rust-lang/rfcs/blob/master/text/0446-es6-unicode-escapes.md
7929 [oibit]: https://github.com/rust-lang/rfcs/blob/master/text/0019-opt-in-builtin-traits.md
7930 [macros]: https://github.com/rust-lang/rfcs/blob/master/text/0378-expr-macros.md
7931 [range]: https://github.com/rust-lang/rfcs/blob/master/text/0439-cmp-ops-reform.md#indexing-and-slicing
7932 [arrays]: https://github.com/rust-lang/rfcs/blob/master/text/0520-new-array-repeat-syntax.md
7933 [show]: https://github.com/rust-lang/rfcs/blob/master/text/0504-show-stabilization.md
7934 [derive]: https://github.com/rust-lang/rfcs/blob/master/text/0534-deriving2derive.md
7935 [self]: https://github.com/rust-lang/rfcs/blob/master/text/0532-self-in-use.md
7936 [fb]: https://github.com/rust-lang/rfcs/blob/master/text/0212-restore-int-fallback.md
7937 [objsafe]: https://github.com/rust-lang/rfcs/blob/master/text/0255-object-safety.md
7938 [assoc]: https://github.com/rust-lang/rfcs/blob/master/text/0195-associated-items.md
7939 [ints]: https://github.com/rust-lang/rfcs/pull/544#issuecomment-68760871
7940 [trpl]: https://doc.rust-lang.org/book/index.html
7941 [rbe]: http://rustbyexample.com/
7944 Version 0.12.0 (2014-10-09)
7945 =============================
7947 * ~1900 changes, numerous bugfixes
7951 * The introductory documentation (now called The Rust Guide) has
7952 been completely rewritten, as have a number of supplementary
7954 * Rust's package manager, Cargo, continues to improve and is
7955 sometimes considered to be quite awesome.
7956 * Many API's in `std` have been reviewed and updated for
7957 consistency with the in-development Rust coding
7958 guidelines. The standard library documentation tracks
7959 stabilization progress.
7960 * Minor libraries have been moved out-of-tree to the rust-lang org
7961 on GitHub: uuid, semver, glob, num, hexfloat, fourcc. They can
7962 be installed with Cargo.
7963 * Lifetime elision allows lifetime annotations to be left off of
7964 function declarations in many common scenarios.
7965 * Rust now works on 64-bit Windows.
7968 * Indexing can be overloaded with the `Index` and `IndexMut`
7970 * The `if let` construct takes a branch only if the `let` pattern
7971 matches, currently behind the 'if_let' feature gate.
7972 * 'where clauses', a more flexible syntax for specifying trait
7973 bounds that is more aesthetic, have been added for traits and
7974 free functions. Where clauses will in the future make it
7975 possible to constrain associated types, which would be
7976 impossible with the existing syntax.
7977 * A new slicing syntax (e.g. `[0..4]`) has been introduced behind
7978 the 'slicing_syntax' feature gate, and can be overloaded with
7979 the `Slice` or `SliceMut` traits.
7980 * The syntax for matching of sub-slices has been changed to use a
7981 postfix `..` instead of prefix (.e.g. `[a, b, c..]`), for
7982 consistency with other uses of `..` and to future-proof
7983 potential additional uses of the syntax.
7984 * The syntax for matching inclusive ranges in patterns has changed
7985 from `0..3` to `0...4` to be consistent with the exclusive range
7987 * Matching of sub-slices in non-tail positions (e.g. `[a.., b,
7988 c]`) has been put behind the 'advanced_slice_patterns' feature
7989 gate and may be removed in the future.
7990 * Components of tuples and tuple structs can be extracted using
7991 the `value.0` syntax, currently behind the `tuple_indexing`
7993 * The `#[crate_id]` attribute is no longer supported; versioning
7994 is handled by the package manager.
7995 * Renaming crate imports are now written `extern crate foo as bar`
7996 instead of `extern crate bar = foo`.
7997 * Renaming use statements are now written `use foo as bar` instead
7999 * `let` and `match` bindings and argument names in macros are now
8001 * The new, more efficient, closure types ('unboxed closures') have
8002 been added under a feature gate, 'unboxed_closures'. These will
8003 soon replace the existing closure types, once higher-ranked
8004 trait lifetimes are added to the language.
8005 * `move` has been added as a keyword, for indicating closures
8006 that capture by value.
8007 * Mutation and assignment is no longer allowed in pattern guards.
8008 * Generic structs and enums can now have trait bounds.
8009 * The `Share` trait is now called `Sync` to free up the term
8010 'shared' to refer to 'shared reference' (the default reference
8012 * Dynamically-sized types have been mostly implemented,
8013 unifying the behavior of fat-pointer types with the rest of the
8015 * As part of dynamically-sized types, the `Sized` trait has been
8016 introduced, which qualifying types implement by default, and
8017 which type parameters expect by default. To specify that a type
8018 parameter does not need to be sized, write `<Sized? T>`. Most
8019 types are `Sized`, notable exceptions being unsized arrays
8020 (`[T]`) and trait types.
8021 * Closures can return `!`, as in `|| -> !` or `proc() -> !`.
8022 * Lifetime bounds can now be applied to type parameters and object
8024 * The old, reference counted GC type, `Gc<T>` which was once
8025 denoted by the `@` sigil, has finally been removed. GC will be
8026 revisited in the future.
8029 * Library documentation has been improved for a number of modules.
8030 * Bit-vectors, collections::bitv has been modernized.
8031 * The url crate is deprecated in favor of
8032 http://github.com/servo/rust-url, which can be installed with
8034 * Most I/O stream types can be cloned and subsequently closed from
8036 * A `std::time::Duration` type has been added for use in I/O
8037 methods that rely on timers, as well as in the 'time' crate's
8038 `Timespec` arithmetic.
8039 * The runtime I/O abstraction layer that enabled the green thread
8040 scheduler to do non-thread-blocking I/O has been removed, along
8041 with the libuv-based implementation employed by the green thread
8042 scheduler. This will greatly simplify the future I/O work.
8043 * `collections::btree` has been rewritten to have a more
8044 idiomatic and efficient design.
8047 * rustdoc output now indicates the stability levels of API's.
8048 * The `--crate-name` flag can specify the name of the crate
8049 being compiled, like `#[crate_name]`.
8050 * The `-C metadata` specifies additional metadata to hash into
8051 symbol names, and `-C extra-filename` specifies additional
8052 information to put into the output filename, for use by the
8053 package manager for versioning.
8054 * debug info generation has continued to improve and should be
8055 more reliable under both gdb and lldb.
8056 * rustc has experimental support for compiling in parallel
8057 using the `-C codegen-units` flag.
8058 * rustc no longer encodes rpath information into binaries by
8062 * Stack usage has been optimized with LLVM lifetime annotations.
8063 * Official Rust binaries on Linux are more compatible with older
8064 kernels and distributions, built on CentOS 5.10.
8067 Version 0.11.0 (2014-07-02)
8068 ==========================
8070 * ~1700 changes, numerous bugfixes
8073 * ~[T] has been removed from the language. This type is superseded by
8075 * ~str has been removed from the language. This type is superseded by
8077 * ~T has been removed from the language. This type is superseded by the
8079 * @T has been removed from the language. This type is superseded by the
8080 standard library's std::gc::Gc<T> type.
8081 * Struct fields are now all private by default.
8082 * Vector indices and shift amounts are both required to be a `uint`
8083 instead of any integral type.
8084 * Byte character, byte string, and raw byte string literals are now all
8085 supported by prefixing the normal literal with a `b`.
8086 * Multiple ABIs are no longer allowed in an ABI string
8087 * The syntax for lifetimes on closures/procedures has been tweaked
8088 slightly: `<'a>|A, B|: 'b + K -> T`
8089 * Floating point modulus has been removed from the language; however it
8090 is still provided by a library implementation.
8091 * Private enum variants are now disallowed.
8092 * The `priv` keyword has been removed from the language.
8093 * A closure can no longer be invoked through a &-pointer.
8094 * The `use foo, bar, baz;` syntax has been removed from the language.
8095 * The transmute intrinsic no longer works on type parameters.
8096 * Statics now allow blocks/items in their definition.
8097 * Trait bounds are separated from objects with + instead of : now.
8098 * Objects can no longer be read while they are mutably borrowed.
8099 * The address of a static is now marked as insignificant unless the
8100 #[inline(never)] attribute is placed it.
8101 * The #[unsafe_destructor] attribute is now behind a feature gate.
8102 * Struct literals are no longer allowed in ambiguous positions such as
8103 if, while, match, and for..in.
8104 * Declaration of lang items and intrinsics are now feature-gated by
8106 * Integral literals no longer default to `int`, and floating point
8107 literals no longer default to `f64`. Literals must be suffixed with an
8108 appropriate type if inference cannot determine the type of the
8110 * The Box<T> type is no longer implicitly borrowed to &mut T.
8111 * Procedures are now required to not capture borrowed references.
8114 * The standard library is now a "facade" over a number of underlying
8115 libraries. This means that development on the standard library should
8116 be speedier due to smaller crates, as well as a clearer line between
8118 * A new library, libcore, lives under the standard library's facade
8119 which is Rust's "0-assumption" library, suitable for embedded and
8120 kernel development for example.
8121 * A regex crate has been added to the standard distribution. This crate
8122 includes statically compiled regular expressions.
8123 * The unwrap/unwrap_err methods on Result require a Show bound for
8124 better error messages.
8125 * The return types of the std::comm primitives have been centralized
8126 around the Result type.
8127 * A number of I/O primitives have gained the ability to time out their
8129 * A number of I/O primitives have gained the ability to close their
8130 reading/writing halves to cancel pending operations.
8131 * Reverse iterator methods have been removed in favor of `rev()` on
8132 their forward-iteration counterparts.
8133 * A bitflags! macro has been added to enable easy interop with C and
8134 management of bit flags.
8135 * A debug_assert! macro is now provided which is disabled when
8136 `--cfg ndebug` is passed to the compiler.
8137 * A graphviz crate has been added for creating .dot files.
8138 * The std::cast module has been migrated into std::mem.
8139 * The std::local_data api has been migrated from freestanding functions
8140 to being based on methods.
8141 * The Pod trait has been renamed to Copy.
8142 * jemalloc has been added as the default allocator for types.
8143 * The API for allocating memory has been changed to use proper alignment
8144 and sized deallocation
8145 * Connecting a TcpStream or binding a TcpListener is now based on a
8146 string address and a u16 port. This allows connecting to a hostname as
8148 * The Reader trait now contains a core method, read_at_least(), which
8149 correctly handles many repeated 0-length reads.
8150 * The process-spawning API is now centered around a builder-style
8152 * The :? printing qualifier has been moved from the standard library to
8153 an external libdebug crate.
8154 * Eq/Ord have been renamed to PartialEq/PartialOrd. TotalEq/TotalOrd
8155 have been renamed to Eq/Ord.
8156 * The select/plural methods have been removed from format!. The escapes
8157 for { and } have also changed from \{ and \} to {{ and }},
8159 * The TaskBuilder API has been re-worked to be a true builder, and
8160 extension traits for spawning native/green tasks have been added.
8163 * All breaking changes to the language or libraries now have their
8164 commit message annotated with `[breaking-change]` to allow for easy
8165 discovery of breaking changes.
8166 * The compiler will now try to suggest how to annotate lifetimes if a
8167 lifetime-related error occurs.
8168 * Debug info continues to be improved greatly with general bug fixes and
8169 better support for situations like link time optimization (LTO).
8170 * Usage of syntax extensions when cross-compiling has been fixed.
8171 * Functionality equivalent to GCC & Clang's -ffunction-sections,
8172 -fdata-sections and --gc-sections has been enabled by default
8173 * The compiler is now stricter about where it will load module files
8174 from when a module is declared via `mod foo;`.
8175 * The #[phase(syntax)] attribute has been renamed to #[phase(plugin)].
8176 Syntax extensions are now discovered via a "plugin registrar" type
8177 which will be extended in the future to other various plugins.
8178 * Lints have been restructured to allow for dynamically loadable lints.
8179 * A number of rustdoc improvements:
8180 * The HTML output has been visually redesigned.
8181 * Markdown is now powered by hoedown instead of sundown.
8182 * Searching heuristics have been greatly improved.
8183 * The search index has been reduced in size by a great amount.
8184 * Cross-crate documentation via `pub use` has been greatly improved.
8185 * Primitive types are now hyperlinked and documented.
8186 * Documentation has been moved from static.rust-lang.org/doc to
8188 * A new sandbox, play.rust-lang.org, is available for running and
8189 sharing rust code examples on-line.
8190 * Unused attributes are now more robustly warned about.
8191 * The dead_code lint now warns about unused struct fields.
8192 * Cross-compiling to iOS is now supported.
8193 * Cross-compiling to mipsel is now supported.
8194 * Stability attributes are now inherited by default and no longer apply
8195 to intra-crate usage, only inter-crate usage.
8196 * Error message related to non-exhaustive match expressions have been
8200 Version 0.10 (2014-04-03)
8201 =========================
8203 * ~1500 changes, numerous bugfixes
8206 * A new RFC process is now in place for modifying the language.
8207 * Patterns with `@`-pointers have been removed from the language.
8208 * Patterns with unique vectors (`~[T]`) have been removed from the
8210 * Patterns with unique strings (`~str`) have been removed from the
8212 * `@str` has been removed from the language.
8213 * `@[T]` has been removed from the language.
8214 * `@self` has been removed from the language.
8215 * `@Trait` has been removed from the language.
8216 * Headers on `~` allocations which contain `@` boxes inside the type for
8217 reference counting have been removed.
8218 * The semantics around the lifetimes of temporary expressions have changed,
8219 see #3511 and #11585 for more information.
8220 * Cross-crate syntax extensions are now possible, but feature gated. See
8221 #11151 for more information. This includes both `macro_rules!` macros as
8222 well as syntax extensions such as `format!`.
8223 * New lint modes have been added, and older ones have been turned on to be
8225 * Unnecessary parentheses
8228 * Uppercase variables
8229 * Publicly visible private types
8230 * `#[deriving]` with raw pointers
8231 * Unsafe functions can no longer be coerced to closures.
8232 * Various obscure macros such as `log_syntax!` are now behind feature gates.
8233 * The `#[simd]` attribute is now behind a feature gate.
8234 * Visibility is no longer allowed on `extern crate` statements, and
8235 unnecessary visibility (`priv`) is no longer allowed on `use` statements.
8236 * Trailing commas are now allowed in argument lists and tuple patterns.
8237 * The `do` keyword has been removed, it is now a reserved keyword.
8238 * Default type parameters have been implemented, but are feature gated.
8239 * Borrowed variables through captures in closures are now considered soundly.
8240 * `extern mod` is now `extern crate`
8241 * The `Freeze` trait has been removed.
8242 * The `Share` trait has been added for types that can be shared among
8244 * Labels in macros are now hygienic.
8245 * Expression/statement macro invocations can be delimited with `{}` now.
8246 * Treatment of types allowed in `static mut` locations has been tweaked.
8247 * The `*` and `.` operators are now overloadable through the `Deref` and
8249 * `~Trait` and `proc` no longer have `Send` bounds by default.
8250 * Partial type hints are now supported with the `_` type marker.
8251 * An `Unsafe` type was introduced for interior mutability. It is now
8252 considered undefined to transmute from `&T` to `&mut T` without using the
8254 * The #[linkage] attribute was implemented for extern statics/functions.
8255 * The inner attribute syntax has changed from `#[foo];` to `#![foo]`.
8256 * `Pod` was renamed to `Copy`.
8259 * The `libextra` library has been removed. It has now been decomposed into
8260 component libraries with smaller and more focused nuggets of
8261 functionality. The full list of libraries can be found on the
8262 documentation index page.
8263 * std: `std::condition` has been removed. All I/O errors are now propagated
8264 through the `Result` type. In order to assist with error handling, a
8265 `try!` macro for unwrapping errors with an early return and a lint for
8266 unused results has been added. See #12039 for more information.
8267 * std: The `vec` module has been renamed to `slice`.
8268 * std: A new vector type, `Vec<T>`, has been added in preparation for DST.
8269 This will become the only growable vector in the future.
8270 * std: `std::io` now has more public re-exports. Types such as `BufferedReader`
8271 are now found at `std::io::BufferedReader` instead of
8272 `std::io::buffered::BufferedReader`.
8273 * std: `print` and `println` are no longer in the prelude, the `print!` and
8274 `println!` macros are intended to be used instead.
8275 * std: `Rc` now has a `Weak` pointer for breaking cycles, and it no longer
8276 attempts to statically prevent cycles.
8277 * std: The standard distribution is adopting the policy of pushing failure
8278 to the user rather than failing in libraries. Many functions (such as
8279 `slice::last()`) now return `Option<T>` instead of `T` + failing.
8280 * std: `fmt::Default` has been renamed to `fmt::Show`, and it now has a new
8281 deriving mode: `#[deriving(Show)]`.
8282 * std: `ToStr` is now implemented for all types implementing `Show`.
8283 * std: The formatting trait methods now take `&self` instead of `&T`
8284 * std: The `invert()` method on iterators has been renamed to `rev()`
8285 * std: `std::num` has seen a reduction in the genericity of its traits,
8286 consolidating functionality into a few core traits.
8287 * std: Backtraces are now printed on task failure if the environment
8288 variable `RUST_BACKTRACE` is present.
8289 * std: Naming conventions for iterators have been standardized. More details
8290 can be found on the wiki's style guide.
8291 * std: `eof()` has been removed from the `Reader` trait. Specific types may
8292 still implement the function.
8293 * std: Networking types are now cloneable to allow simultaneous reads/writes.
8294 * std: `assert_approx_eq!` has been removed
8295 * std: The `e` and `E` formatting specifiers for floats have been added to
8296 print them in exponential notation.
8297 * std: The `Times` trait has been removed
8298 * std: Indications of variance and opting out of builtin bounds is done
8299 through marker types in `std::kinds::marker` now
8300 * std: `hash` has been rewritten, `IterBytes` has been removed, and
8301 `#[deriving(Hash)]` is now possible.
8302 * std: `SharedChan` has been removed, `Sender` is now cloneable.
8303 * std: `Chan` and `Port` were renamed to `Sender` and `Receiver`.
8304 * std: `Chan::new` is now `channel()`.
8305 * std: A new synchronous channel type has been implemented.
8306 * std: A `select!` macro is now provided for selecting over `Receiver`s.
8307 * std: `hashmap` and `trie` have been moved to `libcollections`
8308 * std: `run` has been rolled into `io::process`
8309 * std: `assert_eq!` now uses `{}` instead of `{:?}`
8310 * std: The equality and comparison traits have seen some reorganization.
8311 * std: `rand` has moved to `librand`.
8312 * std: `to_{lower,upper}case` has been implemented for `char`.
8313 * std: Logging has been moved to `liblog`.
8314 * collections: `HashMap` has been rewritten for higher performance and less
8316 * native: The default runtime is now `libnative`. If `libgreen` is desired,
8317 it can be booted manually. The runtime guide has more information and
8319 * native: All I/O functionality except signals has been implemented.
8320 * green: Task spawning with `libgreen` has been optimized with stack caching
8321 and various trimming of code.
8322 * green: Tasks spawned by `libgreen` now have an unmapped guard page.
8323 * sync: The `extra::sync` module has been updated to modern rust (and moved
8324 to the `sync` library), tweaking and improving various interfaces while
8325 dropping redundant functionality.
8326 * sync: A new `Barrier` type has been added to the `sync` library.
8327 * sync: An efficient mutex for native and green tasks has been implemented.
8328 * serialize: The `base64` module has seen some improvement. It treats
8329 newlines better, has non-string error values, and has seen general
8331 * fourcc: A `fourcc!` macro was introduced
8332 * hexfloat: A `hexfloat!` macro was implemented for specifying floats via a
8333 hexadecimal literal.
8336 * `rustpkg` has been deprecated and removed from the main repository. Its
8337 replacement, `cargo`, is under development.
8338 * Nightly builds of rust are now available
8339 * The memory usage of rustc has been improved many times throughout this
8341 * The build process supports disabling rpath support for the rustc binary
8343 * Code generation has improved in some cases, giving more information to the
8344 LLVM optimization passes to enable more extensive optimizations.
8345 * Debuginfo compatibility with lldb on OSX has been restored.
8346 * The master branch is now gated on an android bot, making building for
8347 android much more reliable.
8348 * Output flags have been centralized into one `--emit` flag.
8349 * Crate type flags have been centralized into one `--crate-type` flag.
8350 * Codegen flags have been consolidated behind a `-C` flag.
8351 * Linking against outdated crates now has improved error messages.
8352 * Error messages with lifetimes will often suggest how to annotate the
8353 function to fix the error.
8354 * Many more types are documented in the standard library, and new guides
8356 * Many `rustdoc` improvements:
8357 * code blocks are syntax highlighted.
8358 * render standalone markdown files.
8359 * the --test flag tests all code blocks by default.
8360 * exported macros are displayed.
8361 * re-exported types have their documentation inlined at the location of the
8363 * search works across crates that have been rendered to the same output
8367 Version 0.9 (2014-01-09)
8368 ==========================
8370 * ~1800 changes, numerous bugfixes
8373 * The `float` type has been removed. Use `f32` or `f64` instead.
8374 * A new facility for enabling experimental features (feature gating) has
8375 been added, using the crate-level `#[feature(foo)]` attribute.
8376 * Managed boxes (@) are now behind a feature gate
8377 (`#[feature(managed_boxes)]`) in preparation for future removal. Use the
8378 standard library's `Gc` or `Rc` types instead.
8379 * `@mut` has been removed. Use `std::cell::{Cell, RefCell}` instead.
8380 * Jumping back to the top of a loop is now done with `continue` instead of
8382 * Strings can no longer be mutated through index assignment.
8383 * Raw strings can be created via the basic `r"foo"` syntax or with matched
8384 hash delimiters, as in `r###"foo"###`.
8385 * `~fn` is now written `proc (args) -> retval { ... }` and may only be
8387 * The `&fn` type is now written `|args| -> ret` to match the literal form.
8388 * `@fn`s have been removed.
8389 * `do` only works with procs in order to make it obvious what the cost
8391 * Single-element tuple-like structs can no longer be dereferenced to
8392 obtain the inner value. A more comprehensive solution for overloading
8393 the dereference operator will be provided in the future.
8394 * The `#[link(...)]` attribute has been replaced with
8395 `#[crate_id = "name#vers"]`.
8396 * Empty `impl`s must be terminated with empty braces and may not be
8397 terminated with a semicolon.
8398 * Keywords are no longer allowed as lifetime names; the `self` lifetime
8399 no longer has any special meaning.
8400 * The old `fmt!` string formatting macro has been removed.
8401 * `printf!` and `printfln!` (old-style formatting) removed in favor of
8402 `print!` and `println!`.
8403 * `mut` works in patterns now, as in `let (mut x, y) = (1, 2);`.
8404 * The `extern mod foo (name = "bar")` syntax has been removed. Use
8405 `extern mod foo = "bar"` instead.
8406 * New reserved keywords: `alignof`, `offsetof`, `sizeof`.
8407 * Macros can have attributes.
8408 * Macros can expand to items with attributes.
8409 * Macros can expand to multiple items.
8410 * The `asm!` macro is feature-gated (`#[feature(asm)]`).
8411 * Comments may be nested.
8412 * Values automatically coerce to trait objects they implement, without
8414 * Enum discriminants are no longer an entire word but as small as needed to
8415 contain all the variants. The `repr` attribute can be used to override
8416 the discriminant size, as in `#[repr(int)]` for integer-sized, and
8417 `#[repr(C)]` to match C enums.
8418 * Non-string literals are not allowed in attributes (they never worked).
8419 * The FFI now supports variadic functions.
8420 * Octal numeric literals, as in `0o7777`.
8421 * The `concat!` syntax extension performs compile-time string concatenation.
8422 * The `#[fixed_stack_segment]` and `#[rust_stack]` attributes have been
8423 removed as Rust no longer uses segmented stacks.
8424 * Non-ascii identifiers are feature-gated (`#[feature(non_ascii_idents)]`).
8425 * Ignoring all fields of an enum variant or tuple-struct is done with `..`,
8426 not `*`; ignoring remaining fields of a struct is also done with `..`,
8427 not `_`; ignoring a slice of a vector is done with `..`, not `.._`.
8428 * `rustc` supports the "win64" calling convention via `extern "win64"`.
8429 * `rustc` supports the "system" calling convention, which defaults to the
8430 preferred convention for the target platform, "stdcall" on 32-bit Windows,
8432 * The `type_overflow` lint (default: warn) checks literals for overflow.
8433 * The `unsafe_block` lint (default: allow) checks for usage of `unsafe`.
8434 * The `attribute_usage` lint (default: warn) warns about unknown
8436 * The `unknown_features` lint (default: warn) warns about unknown
8438 * The `dead_code` lint (default: warn) checks for dead code.
8439 * Rust libraries can be linked statically to one another
8440 * `#[link_args]` is behind the `link_args` feature gate.
8441 * Native libraries are now linked with `#[link(name = "foo")]`
8442 * Native libraries can be statically linked to a rust crate
8443 (`#[link(name = "foo", kind = "static")]`).
8444 * Native OS X frameworks are now officially supported
8445 (`#[link(name = "foo", kind = "framework")]`).
8446 * The `#[thread_local]` attribute creates thread-local (not task-local)
8447 variables. Currently behind the `thread_local` feature gate.
8448 * The `return` keyword may be used in closures.
8449 * Types that can be copied via a memcpy implement the `Pod` kind.
8450 * The `cfg` attribute can now be used on struct fields and enum variants.
8453 * std: The `option` and `result` API's have been overhauled to make them
8454 simpler, more consistent, and more composable.
8455 * std: The entire `std::io` module has been replaced with one that is
8456 more comprehensive and that properly interfaces with the underlying
8457 scheduler. File, TCP, UDP, Unix sockets, pipes, and timers are all
8459 * std: `io::util` contains a number of useful implementations of
8460 `Reader` and `Writer`, including `NullReader`, `NullWriter`,
8461 `ZeroReader`, `TeeReader`.
8462 * std: The reference counted pointer type `extra::rc` moved into std.
8463 * std: The `Gc` type in the `gc` module will replace `@` (it is currently
8464 just a wrapper around it).
8465 * std: The `Either` type has been removed.
8466 * std: `fmt::Default` can be implemented for any type to provide default
8467 formatting to the `format!` macro, as in `format!("{}", myfoo)`.
8468 * std: The `rand` API continues to be tweaked.
8469 * std: The `rust_begin_unwind` function, useful for inserting breakpoints
8470 on failure in gdb, is now named `rust_fail`.
8471 * std: The `each_key` and `each_value` methods on `HashMap` have been
8472 replaced by the `keys` and `values` iterators.
8473 * std: Functions dealing with type size and alignment have moved from the
8474 `sys` module to the `mem` module.
8475 * std: The `path` module was written and API changed.
8476 * std: `str::from_utf8` has been changed to cast instead of allocate.
8477 * std: `starts_with` and `ends_with` methods added to vectors via the
8478 `ImmutableEqVector` trait, which is in the prelude.
8479 * std: Vectors can be indexed with the `get_opt` method, which returns `None`
8480 if the index is out of bounds.
8481 * std: Task failure no longer propagates between tasks, as the model was
8482 complex, expensive, and incompatible with thread-based tasks.
8483 * std: The `Any` type can be used for dynamic typing.
8484 * std: `~Any` can be passed to the `fail!` macro and retrieved via
8486 * std: Methods that produce iterators generally do not have an `_iter`
8488 * std: `cell::Cell` and `cell::RefCell` can be used to introduce mutability
8489 roots (mutable fields, etc.). Use instead of e.g. `@mut`.
8490 * std: `util::ignore` renamed to `prelude::drop`.
8491 * std: Slices have `sort` and `sort_by` methods via the `MutableVector`
8493 * std: `vec::raw` has seen a lot of cleanup and API changes.
8494 * std: The standard library no longer includes any C++ code, and very
8495 minimal C, eliminating the dependency on libstdc++.
8496 * std: Runtime scheduling and I/O functionality has been factored out into
8497 extensible interfaces and is now implemented by two different crates:
8498 libnative, for native threading and I/O; and libgreen, for green threading
8499 and I/O. This paves the way for using the standard library in more limited
8500 embedded environments.
8501 * std: The `comm` module has been rewritten to be much faster, have a
8502 simpler, more consistent API, and to work for both native and green
8504 * std: All libuv dependencies have been moved into the rustuv crate.
8505 * native: New implementations of runtime scheduling on top of OS threads.
8506 * native: New native implementations of TCP, UDP, file I/O, process spawning,
8508 * green: The green thread scheduler and message passing types are almost
8510 * extra: The `flatpipes` module had bitrotted and was removed.
8511 * extra: All crypto functions have been removed and Rust now has a policy of
8512 not reimplementing crypto in the standard library. In the future crypto
8513 will be provided by external crates with bindings to established libraries.
8514 * extra: `c_vec` has been modernized.
8515 * extra: The `sort` module has been removed. Use the `sort` method on
8519 * The `rust` and `rusti` commands have been removed, due to lack of
8521 * `rustdoc` was completely rewritten.
8522 * `rustdoc` can test code examples in documentation.
8523 * `rustpkg` can test packages with the argument, 'test'.
8524 * `rustpkg` supports arbitrary dependencies, including C libraries.
8525 * `rustc`'s support for generating debug info is improved again.
8526 * `rustc` has better error reporting for unbalanced delimiters.
8527 * `rustc`'s JIT support was removed due to bitrot.
8528 * Executables and static libraries can be built with LTO (-Z lto)
8529 * `rustc` adds a `--dep-info` flag for communicating dependencies to
8533 Version 0.8 (2013-09-26)
8534 ============================
8536 * ~2200 changes, numerous bugfixes
8539 * The `for` loop syntax has changed to work with the `Iterator` trait.
8540 * At long last, unwinding works on Windows.
8541 * Default methods are ready for use.
8542 * Many trait inheritance bugs fixed.
8543 * Owned and borrowed trait objects work more reliably.
8544 * `copy` is no longer a keyword. It has been replaced by the `Clone` trait.
8545 * rustc can omit emission of code for the `debug!` macro if it is passed
8547 * mod.rs is now "blessed". When loading `mod foo;`, rustc will now look
8548 for foo.rs, then foo/mod.rs, and will generate an error when both are
8550 * Strings no longer contain trailing nulls. The new `std::c_str` module
8551 provides new mechanisms for converting to C strings.
8552 * The type of foreign functions is now `extern "C" fn` instead of `*u8'.
8553 * The FFI has been overhauled such that foreign functions are called directly,
8554 instead of through a stack-switching wrapper.
8555 * Calling a foreign function must be done through a Rust function with the
8556 `#[fixed_stack_segment]` attribute.
8557 * The `externfn!` macro can be used to declare both a foreign function and
8558 a `#[fixed_stack_segment]` wrapper at once.
8559 * `pub` and `priv` modifiers on `extern` blocks are no longer parsed.
8560 * `unsafe` is no longer allowed on extern fns - they are all unsafe.
8561 * `priv` is disallowed everywhere except for struct fields and enum variants.
8562 * `&T` (besides `&'static T`) is no longer allowed in `@T`.
8563 * `ref` bindings in irrefutable patterns work correctly now.
8564 * `char` is now prevented from containing invalid code points.
8565 * Casting to `bool` is no longer allowed.
8566 * `\0` is now accepted as an escape in chars and strings.
8567 * `yield` is a reserved keyword.
8568 * `typeof` is a reserved keyword.
8569 * Crates may be imported by URL with `extern mod foo = "url";`.
8570 * Explicit enum discriminants may be given as uints as in `enum E { V = 0u }`
8571 * Static vectors can be initialized with repeating elements,
8572 e.g. `static foo: [u8, .. 100]: [0, .. 100];`.
8573 * Static structs can be initialized with functional record update,
8574 e.g. `static foo: Foo = Foo { a: 5, .. bar };`.
8575 * `cfg!` can be used to conditionally execute code based on the crate
8576 configuration, similarly to `#[cfg(...)]`.
8577 * The `unnecessary_qualification` lint detects unneeded module
8578 prefixes (default: allow).
8579 * Arithmetic operations have been implemented on the SIMD types in
8580 `std::unstable::simd`.
8581 * Exchange allocation headers were removed, reducing memory usage.
8582 * `format!` implements a completely new, extensible, and higher-performance
8583 string formatting system. It will replace `fmt!`.
8584 * `print!` and `println!` write formatted strings (using the `format!`
8585 extension) to stdout.
8586 * `write!` and `writeln!` write formatted strings (using the `format!`
8587 extension) to the new Writers in `std::rt::io`.
8588 * The library section in which a function or static is placed may
8589 be specified with `#[link_section = "..."]`.
8590 * The `proto!` syntax extension for defining bounded message protocols
8592 * `macro_rules!` is hygienic for `let` declarations.
8593 * The `#[export_name]` attribute specifies the name of a symbol.
8594 * `unreachable!` can be used to indicate unreachable code, and fails
8598 * std: Transitioned to the new runtime, written in Rust.
8599 * std: Added an experimental I/O library, `rt::io`, based on the new
8601 * std: A new generic `range` function was added to the prelude, replacing
8602 `uint::range` and friends.
8603 * std: `range_rev` no longer exists. Since range is an iterator it can be
8604 reversed with `range(lo, hi).invert()`.
8605 * std: The `chain` method on option renamed to `and_then`; `unwrap_or_default`
8606 renamed to `unwrap_or`.
8607 * std: The `iterator` module was renamed to `iter`.
8608 * std: Integral types now support the `checked_add`, `checked_sub`, and
8609 `checked_mul` operations for detecting overflow.
8610 * std: Many methods in `str`, `vec`, `option, `result` were renamed for
8612 * std: Methods are standardizing on conventions for casting methods:
8613 `to_foo` for copying, `into_foo` for moving, `as_foo` for temporary
8615 * std: The `CString` type in `c_str` provides new ways to convert to and
8617 * std: `DoubleEndedIterator` can yield elements in two directions.
8618 * std: The `mut_split` method on vectors partitions an `&mut [T]` into
8620 * std: `str::from_bytes` renamed to `str::from_utf8`.
8621 * std: `pop_opt` and `shift_opt` methods added to vectors.
8622 * std: The task-local data interface no longer uses @, and keys are
8623 no longer function pointers.
8624 * std: The `swap_unwrap` method of `Option` renamed to `take_unwrap`.
8625 * std: Added `SharedPort` to `comm`.
8626 * std: `Eq` has a default method for `ne`; only `eq` is required
8628 * std: `Ord` has default methods for `le`, `gt` and `ge`; only `lt`
8629 is required in implementations.
8630 * std: `is_utf8` performance is improved, impacting many string functions.
8631 * std: `os::MemoryMap` provides cross-platform mmap.
8632 * std: `ptr::offset` is now unsafe, but also more optimized. Offsets that
8633 are not 'in-bounds' are considered undefined.
8634 * std: Many freestanding functions in `vec` removed in favor of methods.
8635 * std: Many freestanding functions on scalar types removed in favor of
8637 * std: Many options to task builders were removed since they don't make
8638 sense in the new scheduler design.
8639 * std: More containers implement `FromIterator` so can be created by the
8641 * std: More complete atomic types in `unstable::atomics`.
8642 * std: `comm::PortSet` removed.
8643 * std: Mutating methods in the `Set` and `Map` traits have been moved into
8644 the `MutableSet` and `MutableMap` traits. `Container::is_empty`,
8645 `Map::contains_key`, `MutableMap::insert`, and `MutableMap::remove` have
8646 default implementations.
8647 * std: Various `from_str` functions were removed in favor of a generic
8648 `from_str` which is available in the prelude.
8649 * std: `util::unreachable` removed in favor of the `unreachable!` macro.
8650 * extra: `dlist`, the doubly-linked list was modernized.
8651 * extra: Added a `hex` module with `ToHex` and `FromHex` traits.
8652 * extra: Added `glob` module, replacing `std::os::glob`.
8653 * extra: `rope` was removed.
8654 * extra: `deque` was renamed to `ringbuf`. `RingBuf` implements `Deque`.
8655 * extra: `net`, and `timer` were removed. The experimental replacements
8656 are `std::rt::io::net` and `std::rt::io::timer`.
8657 * extra: Iterators implemented for `SmallIntMap`.
8658 * extra: Iterators implemented for `Bitv` and `BitvSet`.
8659 * extra: `SmallIntSet` removed. Use `BitvSet`.
8660 * extra: Performance of JSON parsing greatly improved.
8661 * extra: `semver` updated to SemVer 2.0.0.
8662 * extra: `term` handles more terminals correctly.
8663 * extra: `dbg` module removed.
8664 * extra: `par` module removed.
8665 * extra: `future` was cleaned up, with some method renames.
8666 * extra: Most free functions in `getopts` were converted to methods.
8669 * rustc's debug info generation (`-Z debug-info`) is greatly improved.
8670 * rustc accepts `--target-cpu` to compile to a specific CPU architecture,
8671 similarly to gcc's `--march` flag.
8672 * rustc's performance compiling small crates is much better.
8673 * rustpkg has received many improvements.
8674 * rustpkg supports git tags as package IDs.
8675 * rustpkg builds into target-specific directories so it can be used for
8677 * The number of concurrent test tasks is controlled by the environment
8678 variable RUST_TEST_TASKS.
8679 * The test harness can now report metrics for benchmarks.
8680 * All tools have man pages.
8681 * Programs compiled with `--test` now support the `-h` and `--help` flags.
8682 * The runtime uses jemalloc for allocations.
8683 * Segmented stacks are temporarily disabled as part of the transition to
8684 the new runtime. Stack overflows are possible!
8685 * A new documentation backend, rustdoc_ng, is available for use. It is
8686 still invoked through the normal `rustdoc` command.
8689 Version 0.7 (2013-07-03)
8690 =======================
8692 * ~2000 changes, numerous bugfixes
8695 * `impl`s no longer accept a visibility qualifier. Put them on methods
8697 * The borrow checker has been rewritten with flow-sensitivity, fixing
8698 many bugs and inconveniences.
8699 * The `self` parameter no longer implicitly means `&'self self`,
8700 and can be explicitly marked with a lifetime.
8701 * Overloadable compound operators (`+=`, etc.) have been temporarily
8702 removed due to bugs.
8703 * The `for` loop protocol now requires `for`-iterators to return `bool`
8704 so they compose better.
8705 * The `Durable` trait is replaced with the `'static` bounds.
8706 * Trait default methods work more often.
8707 * Structs with the `#[packed]` attribute have byte alignment and
8708 no padding between fields.
8709 * Type parameters bound by `Copy` must now be copied explicitly with
8711 * It is now illegal to move out of a dereferenced unsafe pointer.
8712 * `Option<~T>` is now represented as a nullable pointer.
8713 * `@mut` does dynamic borrow checks correctly.
8714 * The `main` function is only detected at the topmost level of the crate.
8715 The `#[main]` attribute is still valid anywhere.
8716 * Struct fields may no longer be mutable. Use inherited mutability.
8717 * The `#[no_send]` attribute makes a type that would otherwise be
8719 * The `#[no_freeze]` attribute makes a type that would otherwise be
8721 * Unbounded recursion will abort the process after reaching the limit
8722 specified by the `RUST_MAX_STACK` environment variable (default: 1GB).
8723 * The `vecs_implicitly_copyable` lint mode has been removed. Vectors
8724 are never implicitly copyable.
8725 * `#[static_assert]` makes compile-time assertions about static bools.
8726 * At long last, 'argument modes' no longer exist.
8727 * The rarely used `use mod` statement no longer exists.
8730 * `fail!` and `assert!` accept `~str`, `&'static str` or `fmt!`-style
8732 * `Encodable`, `Decodable`, `Ord`, `TotalOrd`, `TotalEq`, `DeepClone`,
8733 `Rand`, `Zero` and `ToStr` can all be automatically derived with
8735 * The `bytes!` macro returns a vector of bytes for string, u8, char,
8736 and unsuffixed integer literals.
8739 * The `core` crate was renamed to `std`.
8740 * The `std` crate was renamed to `extra`.
8741 * More and improved documentation.
8742 * std: `iterator` module for external iterator objects.
8743 * Many old-style (internal, higher-order function) iterators replaced by
8744 implementations of `Iterator`.
8745 * std: Many old internal vector and string iterators,
8746 incl. `any`, `all`. removed.
8747 * std: The `finalize` method of `Drop` renamed to `drop`.
8748 * std: The `drop` method now takes `&mut self` instead of `&self`.
8749 * std: The prelude no longer re-exports any modules, only types and traits.
8750 * std: Prelude additions: `print`, `println`, `FromStr`, `ApproxEq`, `Equiv`,
8751 `Iterator`, `IteratorUtil`, many numeric traits, many tuple traits.
8752 * std: New numeric traits: `Fractional`, `Real`, `RealExt`, `Integer`, `Ratio`,
8753 `Algebraic`, `Trigonometric`, `Exponential`, `Primitive`.
8754 * std: Tuple traits and accessors defined for up to 12-tuples, e.g.
8755 `(0, 1, 2).n2()` or `(0, 1, 2).n2_ref()`.
8756 * std: Many types implement `Clone`.
8757 * std: `path` type renamed to `Path`.
8758 * std: `mut` module and `Mut` type removed.
8759 * std: Many standalone functions removed in favor of methods and iterators
8760 in `vec`, `str`. In the future methods will also work as functions.
8761 * std: `reinterpret_cast` removed. Use `transmute`.
8762 * std: ascii string handling in `std::ascii`.
8763 * std: `Rand` is implemented for ~/@.
8764 * std: `run` module for spawning processes overhauled.
8765 * std: Various atomic types added to `unstable::atomic`.
8766 * std: Various types implement `Zero`.
8767 * std: `LinearMap` and `LinearSet` renamed to `HashMap` and `HashSet`.
8768 * std: Borrowed pointer functions moved from `ptr` to `borrow`.
8769 * std: Added `os::mkdir_recursive`.
8770 * std: Added `os::glob` function performs filesystems globs.
8771 * std: `FuzzyEq` renamed to `ApproxEq`.
8772 * std: `Map` now defines `pop` and `swap` methods.
8773 * std: `Cell` constructors converted to static methods.
8774 * extra: `rc` module adds the reference counted pointers, `Rc` and `RcMut`.
8775 * extra: `flate` module moved from `std` to `extra`.
8776 * extra: `fileinput` module for iterating over a series of files.
8777 * extra: `Complex` number type and `complex` module.
8778 * extra: `Rational` number type and `rational` module.
8779 * extra: `BigInt`, `BigUint` implement numeric and comparison traits.
8780 * extra: `term` uses terminfo now, is more correct.
8781 * extra: `arc` functions converted to methods.
8782 * extra: Implementation of fixed output size variations of SHA-2.
8785 * `unused_variables` lint mode for unused variables (default: warn).
8786 * `unused_unsafe` lint mode for detecting unnecessary `unsafe` blocks
8788 * `unused_mut` lint mode for identifying unused `mut` qualifiers
8790 * `dead_assignment` lint mode for unread variables (default: warn).
8791 * `unnecessary_allocation` lint mode detects some heap allocations that are
8792 immediately borrowed so could be written without allocating (default: warn).
8793 * `missing_doc` lint mode (default: allow).
8794 * `unreachable_code` lint mode (default: warn).
8795 * The `rusti` command has been rewritten and a number of bugs addressed.
8796 * rustc outputs in color on more terminals.
8797 * rustc accepts a `--link-args` flag to pass arguments to the linker.
8798 * rustc accepts a `-Z print-link-args` flag for debugging linkage.
8799 * Compiling with `-g` will make the binary record information about
8800 dynamic borrowcheck failures for debugging.
8801 * rustdoc has a nicer stylesheet.
8802 * Various improvements to rustdoc.
8803 * Improvements to rustpkg (see the detailed release notes).
8806 Version 0.6 (2013-04-03)
8807 ========================
8809 * ~2100 changes, numerous bugfixes
8812 * The self type parameter in traits is now spelled `Self`
8813 * The `self` parameter in trait and impl methods must now be explicitly
8814 named (for example: `fn f(&self) { }`). Implicit self is deprecated.
8815 * Static methods no longer require the `static` keyword and instead
8816 are distinguished by the lack of a `self` parameter
8817 * Replaced the `Durable` trait with the `'static` lifetime
8818 * The old closure type syntax with the trailing sigil has been
8819 removed in favor of the more consistent leading sigil
8820 * `super` is a keyword, and may be prefixed to paths
8821 * Trait bounds are separated with `+` instead of whitespace
8822 * Traits are implemented with `impl Trait for Type`
8823 instead of `impl Type: Trait`
8824 * Lifetime syntax is now `&'l foo` instead of `&l/foo`
8825 * The `export` keyword has finally been removed
8826 * The `move` keyword has been removed (see "Semantic changes")
8827 * The interior mutability qualifier on vectors, `[mut T]`, has been
8828 removed. Use `&mut [T]`, etc.
8829 * `mut` is no longer valid in `~mut T`. Use inherited mutability
8830 * `fail` is no longer a keyword. Use `fail!()`
8831 * `assert` is no longer a keyword. Use `assert!()`
8832 * `log` is no longer a keyword. use `debug!`, etc.
8833 * 1-tuples may be represented as `(T,)`
8834 * Struct fields may no longer be `mut`. Use inherited mutability,
8835 `@mut T`, `core::mut` or `core::cell`
8836 * `extern mod { ... }` is no longer valid syntax for foreign
8837 function modules. Use extern blocks: `extern { ... }`
8838 * Newtype enums removed. Use tuple-structs.
8839 * Trait implementations no longer support visibility modifiers
8840 * Pattern matching over vectors improved and expanded
8841 * `const` renamed to `static` to correspond to lifetime name,
8842 and make room for future `static mut` unsafe mutable globals.
8843 * Replaced `#[deriving_eq]` with `#[deriving(Eq)]`, etc.
8844 * `Clone` implementations can be automatically generated with
8845 `#[deriving(Clone)]`
8846 * Casts to traits must use a pointer sigil, e.g. `@foo as @Bar`
8847 instead of `foo as Bar`.
8848 * Fixed length vector types are now written as `[int, .. 3]`
8849 instead of `[int * 3]`.
8850 * Fixed length vector types can express the length as a constant
8851 expression. (ex: `[int, .. GL_BUFFER_SIZE - 2]`)
8854 * Types with owned pointers or custom destructors move by default,
8855 eliminating the `move` keyword
8856 * All foreign functions are considered unsafe
8857 * &mut is now unaliasable
8858 * Writes to borrowed @mut pointers are prevented dynamically
8860 * The name of the main function can be customized using #[main]
8861 * The default type of an inferred closure is &fn instead of @fn
8862 * `use` statements may no longer be "chained" - they cannot import
8863 identifiers imported by previous `use` statements
8864 * `use` statements are crate relative, importing from the "top"
8865 of the crate by default. Paths may be prefixed with `super::`
8866 or `self::` to change the search behavior.
8867 * Method visibility is inherited from the implementation declaration
8868 * Structural records have been removed
8869 * Many more types can be used in static items, including enums
8870 'static-lifetime pointers and vectors
8871 * Pattern matching over vectors improved and expanded
8872 * Typechecking of closure types has been overhauled to
8873 improve inference and eliminate unsoundness
8874 * Macros leave scope at the end of modules, unless that module is
8875 tagged with #[macro_escape]
8878 * Added big integers to `std::bigint`
8879 * Removed `core::oldcomm` module
8880 * Added pipe-based `core::comm` module
8881 * Numeric traits have been reorganized under `core::num`
8882 * `vec::slice` finally returns a slice
8883 * `debug!` and friends don't require a format string, e.g. `debug!(Foo)`
8884 * Containers reorganized around traits in `core::container`
8885 * `core::dvec` removed, `~[T]` is a drop-in replacement
8886 * `core::send_map` renamed to `core::hashmap`
8887 * `std::map` removed; replaced with `core::hashmap`
8888 * `std::treemap` reimplemented as an owned balanced tree
8889 * `std::deque` and `std::smallintmap` reimplemented as owned containers
8890 * `core::trie` added as a fast ordered map for integer keys
8891 * Set types added to `core::hashmap`, `core::trie` and `std::treemap`
8892 * `Ord` split into `Ord` and `TotalOrd`. `Ord` is still used to
8893 overload the comparison operators, whereas `TotalOrd` is used
8894 by certain container types
8897 * Replaced the 'cargo' package manager with 'rustpkg'
8898 * Added all-purpose 'rust' tool
8899 * `rustc --test` now supports benchmarks with the `#[bench]` attribute
8900 * rustc now *attempts* to offer spelling suggestions
8901 * Improved support for ARM and Android
8902 * Preliminary MIPS backend
8903 * Improved foreign function ABI implementation for x86, x86_64
8904 * Various memory usage improvements
8905 * Rust code may be embedded in foreign code under limited circumstances
8906 * Inline assembler supported by new asm!() syntax extension.
8909 Version 0.5 (2012-12-21)
8910 ===========================
8912 * ~900 changes, numerous bugfixes
8915 * Removed `<-` move operator
8916 * Completed the transition from the `#fmt` extension syntax to `fmt!`
8917 * Removed old fixed length vector syntax - `[T]/N`
8918 * New token-based quasi-quoters, `quote_tokens!`, `quote_expr!`, etc.
8919 * Macros may now expand to items and statements
8920 * `a.b()` is always parsed as a method call, never as a field projection
8921 * `Eq` and `IterBytes` implementations can be automatically generated
8922 with `#[deriving_eq]` and `#[deriving_iter_bytes]` respectively
8923 * Removed the special crate language for `.rc` files
8924 * Function arguments may consist of any irrefutable pattern
8927 * `&` and `~` pointers may point to objects
8928 * Tuple structs - `struct Foo(Bar, Baz)`. Will replace newtype enums.
8929 * Enum variants may be structs
8930 * Destructors can be added to all nominal types with the Drop trait
8931 * Structs and nullary enum variants may be constants
8932 * Values that cannot be implicitly copied are now automatically moved
8933 without writing `move` explicitly
8934 * `&T` may now be coerced to `*T`
8935 * Coercions happen in `let` statements as well as function calls
8936 * `use` statements now take crate-relative paths
8937 * The module and type namespaces have been merged so that static
8938 method names can be resolved under the trait in which they are
8941 * Improved support for language features
8942 * Trait inheritance works in many scenarios
8943 * More support for explicit self arguments in methods - `self`, `&self`
8944 `@self`, and `~self` all generally work as expected
8945 * Static methods work in more situations
8946 * Experimental: Traits may declare default methods for the implementations
8950 * New condition handling system in `core::condition`
8951 * Timsort added to `std::sort`
8952 * New priority queue, `std::priority_queue`
8953 * Pipes for serializable types, `std::flatpipes'
8954 * Serialization overhauled to be trait-based
8955 * Expanded `getopts` definitions
8956 * Moved futures to `std`
8957 * More functions are pure now
8958 * `core::comm` renamed to `oldcomm`. Still deprecated
8959 * `rustdoc` and `cargo` are libraries now
8962 * Added a preliminary REPL, `rusti`
8963 * License changed from MIT to dual MIT/APL2
8966 Version 0.4 (2012-10-15)
8967 ==========================
8969 * ~2000 changes, numerous bugfixes
8972 * All keywords are now strict and may not be used as identifiers anywhere
8973 * Keyword removal: 'again', 'import', 'check', 'new', 'owned', 'send',
8974 'of', 'with', 'to', 'class'.
8975 * Classes are replaced with simpler structs
8976 * Explicit method self types
8977 * `ret` became `return` and `alt` became `match`
8978 * `import` is now `use`; `use is now `extern mod`
8979 * `extern mod { ... }` is now `extern { ... }`
8980 * `use mod` is the recommended way to import modules
8981 * `pub` and `priv` replace deprecated export lists
8982 * The syntax of `match` pattern arms now uses fat arrow (=>)
8983 * `main` no longer accepts an args vector; use `os::args` instead
8986 * Trait implementations are now coherent, ala Haskell typeclasses
8987 * Trait methods may be static
8988 * Argument modes are deprecated
8989 * Borrowed pointers are much more mature and recommended for use
8990 * Strings and vectors in the static region are stored in constant memory
8991 * Typestate was removed
8992 * Resolution rewritten to be more reliable
8993 * Support for 'dual-mode' data structures (freezing and thawing)
8996 * Most binary operators can now be overloaded via the traits in
8998 * `std::net::url` for representing URLs
8999 * Sendable hash maps in `core::send_map`
9000 * `core::task' gained a (currently unsafe) task-local storage API
9003 * An efficient new intertask communication primitive called the pipe,
9004 along with a number of higher-level channel types, in `core::pipes`
9005 * `std::arc`, an atomically reference counted, immutable, shared memory
9007 * `std::sync`, various exotic synchronization tools based on arcs and pipes
9008 * Futures are now based on pipes and sendable
9009 * More robust linked task failure
9010 * Improved task builder API
9013 * Improved error reporting
9014 * Preliminary JIT support
9015 * Preliminary work on precise GC
9016 * Extensive architectural improvements to rustc
9017 * Begun a transition away from buggy C++-based reflection (shape) code to
9018 Rust-based (visitor) code
9019 * All hash functions and tables converted to secure, randomized SipHash
9022 Version 0.3 (2012-07-12)
9023 ========================
9025 * ~1900 changes, numerous bugfixes
9027 * New coding conveniences
9028 * Integer-literal suffix inference
9029 * Per-item control over warnings, errors
9030 * #[cfg(windows)] and #[cfg(unix)] attributes
9031 * Documentation comments
9032 * More compact closure syntax
9033 * 'do' expressions for treating higher-order functions as
9035 * *-patterns (wildcard extended to all constructor fields)
9038 * Name resolution pass and exhaustiveness checker rewritten
9039 * Region pointers and borrow checking supersede alias
9041 * Init-ness checking is now provided by a region-based liveness
9042 pass instead of the typestate pass; same for last-use analysis
9043 * Extensive work on region pointers
9045 * Experimental new language features
9046 * Slices and fixed-size, interior-allocated vectors
9047 * #!-comments for lang versioning, shell execution
9048 * Destructors and iface implementation for classes;
9049 type-parameterized classes and class methods
9050 * 'const' type kind for types that can be used to implement
9051 shared-memory concurrency patterns
9055 * Removal of various obsolete features
9056 * Keywords: 'be', 'prove', 'syntax', 'note', 'mutable', 'bind',
9057 'crust', 'native' (now 'extern'), 'cont' (now 'again')
9059 * Constructs: do-while loops ('do' repurposed), fn binding,
9060 resources (replaced by destructors)
9062 * Compiler reorganization
9063 * Syntax-layer of compiler split into separate crate
9064 * Clang (from LLVM project) integrated into build
9065 * Typechecker split into sub-modules
9068 * New time functions
9069 * Extension methods for many built-in types
9070 * Arc: atomic-refcount read-only / exclusive-use shared cells
9071 * Par: parallel map and search routines
9072 * Extensive work on libuv interface
9073 * Much vector code moved to libraries
9074 * Syntax extensions: #line, #col, #file, #mod, #stringify,
9075 #include, #include_str, #include_bin
9078 * Cargo automatically resolves dependencies
9081 Version 0.2 (2012-03-29)
9082 =========================
9084 * >1500 changes, numerous bugfixes
9086 * New docs and doc tooling
9088 * New port: FreeBSD x86_64
9090 * Compilation model enhancements
9091 * Generics now specialized, multiply instantiated
9092 * Functions now inlined across separate crates
9094 * Scheduling, stack and threading fixes
9095 * Noticeably improved message-passing performance
9096 * Explicit schedulers
9100 * Experimental new language features
9101 * Operator overloading
9105 * Various language extensions
9106 * C-callback function types: 'crust fn ...'
9107 * Infinite-loop construct: 'loop { ... }'
9108 * Shorten 'mutable' to 'mut'
9109 * Required mutable-local qualifier: 'let mut ...'
9110 * Basic glob-exporting: 'export foo::*;'
9111 * Alt now exhaustive, 'alt check' for runtime-checked
9112 * Block-function form of 'for' loop, with 'break' and 'ret'.
9115 * AST quasi-quote syntax extension
9116 * Revived libuv interface
9117 * New modules: core::{future, iter}, std::arena
9118 * Merged per-platform std::{os*, fs*} to core::{libc, os}
9119 * Extensive cleanup, regularization in libstd, libcore
9122 Version 0.1 (2012-01-20)
9123 ===============================
9125 * Most language features work, including:
9126 * Unique pointers, unique closures, move semantics
9127 * Interface-constrained generics
9128 * Static interface dispatch
9130 * Multithread task scheduling
9131 * Typestate predicates
9132 * Failure unwinding, destructors
9133 * Pattern matching and destructuring assignment
9134 * Lightweight block-lambda syntax
9135 * Preliminary macro-by-example
9137 * Compiler works with the following configurations:
9138 * Linux: x86 and x86_64 hosts and targets
9139 * macOS: x86 and x86_64 hosts and targets
9140 * Windows: x86 hosts and targets
9142 * Cross compilation / multi-target configuration supported.
9144 * Preliminary API-documentation and package-management tools included.
9148 * Documentation is incomplete.
9150 * Performance is below intended target.
9152 * Standard library APIs are subject to extensive change, reorganization.
9154 * Language-level versioning is not yet operational - future code will